super.c 159.1 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/parser.h>
#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
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#include <linux/ctype.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <linux/cleancache.h>
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#include <asm/uaccess.h>

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

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

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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
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static 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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static struct inode *ext4_get_journal_inode(struct super_block *sb,
					    unsigned int journal_inum);
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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);
	}
517
	save_error_info(inode->i_sb, function, line);
518 519 520
	ext4_handle_error(inode->i_sb);
}

521 522
const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
523 524 525 526
{
	char *errstr = NULL;

	switch (errno) {
527 528 529 530 531 532
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
533 534 535 536 537 538 539
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
540 541
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560
			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;
}

561
/* __ext4_std_error decodes expected errors from journaling functions
562 563
 * automatically and invokes the appropriate error response.  */

564 565
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
566 567 568 569 570 571 572 573 574 575 576
{
	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;

577 578 579 580 581
	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);
	}
582

583
	save_error_info(sb, function, line);
584
	ext4_handle_error(sb);
585 586 587
}

/*
588
 * ext4_abort is a much stronger failure handler than ext4_error.  The
589 590 591 592 593 594 595 596
 * 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.
 */

597
void __ext4_abort(struct super_block *sb, const char *function,
598
		unsigned int line, const char *fmt, ...)
599
{
600
	struct va_format vaf;
601 602
	va_list args;

603
	save_error_info(sb, function, line);
604
	va_start(args, fmt);
605 606 607 608
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
609 610
	va_end(args);

611 612 613
	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;
614 615 616 617 618 619
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
620 621 622 623
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
624 625 626 627
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
628
		panic("EXT4-fs panic from previous error\n");
629
	}
630 631
}

632 633
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
634
{
J
Joe Perches 已提交
635
	struct va_format vaf;
636 637
	va_list args;

638 639 640
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

641
	va_start(args, fmt);
J
Joe Perches 已提交
642 643 644
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
645 646 647
	va_end(args);
}

648 649 650 651
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

652
void __ext4_warning(struct super_block *sb, const char *function,
653
		    unsigned int line, const char *fmt, ...)
654
{
J
Joe Perches 已提交
655
	struct va_format vaf;
656 657
	va_list args;

658
	if (!ext4_warning_ratelimit(sb))
659 660
		return;

661
	va_start(args, fmt);
J
Joe Perches 已提交
662 663 664 665
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
666 667 668
	va_end(args);
}

669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
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);
}

687 688 689 690
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, ...)
691 692 693
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
694
	struct va_format vaf;
695 696 697
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

698 699 700
	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
701

702 703 704 705 706 707 708 709 710 711 712 713 714 715
	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);
	}
716 717

	if (test_opt(sb, ERRORS_CONT)) {
718
		ext4_commit_super(sb, 0);
719 720
		return;
	}
721

722 723 724 725 726 727 728 729
	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
730
	 * ext4_grp_locked_error() to distinguish between the
731 732 733 734 735 736 737 738
	 * 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;
}

739
void ext4_update_dynamic_rev(struct super_block *sb)
740
{
741
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
742

743
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
744 745
		return;

746
	ext4_warning(sb,
747 748
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
749
		     EXT4_DYNAMIC_REV);
750

751 752 753
	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);
754 755 756 757 758 759 760 761 762 763 764 765 766
	/* 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
 */
767
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
768 769 770 771
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

772
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
773 774 775 776 777
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
778
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
779 780 781 782 783 784 785
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
786
static void ext4_blkdev_put(struct block_device *bdev)
787
{
A
Al Viro 已提交
788
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
789 790
}

A
Al Viro 已提交
791
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
792 793 794 795
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
796
		ext4_blkdev_put(bdev);
797 798 799 800 801 802
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
803
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
804 805
}

806
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
807 808 809
{
	struct list_head *l;

810 811
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
812 813 814 815 816 817 818 819 820 821 822 823

	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));
	}
}

824
static void ext4_put_super(struct super_block *sb)
825
{
826 827
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
828
	int i, err;
829

830
	ext4_unregister_li_request(sb);
831 832
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

833 834
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
835

836 837 838 839
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
840
			ext4_abort(sb, "Couldn't clean up the journal");
841
	}
842

843
	ext4_unregister_sysfs(sb);
844
	ext4_es_unregister_shrinker(sbi);
845
	del_timer_sync(&sbi->s_err_report);
846 847 848 849
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);

850
	if (!(sb->s_flags & MS_RDONLY)) {
851
		ext4_clear_feature_journal_needs_recovery(sb);
852 853
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
854
	if (!(sb->s_flags & MS_RDONLY))
855 856
		ext4_commit_super(sb, 1);

857 858
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
859 860
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
861
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
862 863
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
864
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
865
	percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
866 867
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
868
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
869 870 871 872 873 874 875 876 877 878 879
		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));

880
	sync_blockdev(sb->s_bdev);
881
	invalidate_bdev(sb->s_bdev);
882 883 884 885 886 887 888
	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);
889
		invalidate_bdev(sbi->journal_bdev);
890
		ext4_blkdev_remove(sbi);
891
	}
892 893 894 895
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
896 897
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
898
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
899 900 901 902 903 904
	/*
	 * 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);
905 906
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
907
	kfree(sbi->s_blockgroup_lock);
908 909 910
	kfree(sbi);
}

911
static struct kmem_cache *ext4_inode_cachep;
912 913 914 915

/*
 * Called inside transaction, so use GFP_NOFS
 */
916
static struct inode *ext4_alloc_inode(struct super_block *sb)
917
{
918
	struct ext4_inode_info *ei;
919

C
Christoph Lameter 已提交
920
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
921 922
	if (!ei)
		return NULL;
923

924
	ei->vfs_inode.i_version = 1;
925
	spin_lock_init(&ei->i_raw_lock);
926 927
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
928 929
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
930
	INIT_LIST_HEAD(&ei->i_es_list);
931
	ei->i_es_all_nr = 0;
932
	ei->i_es_shk_nr = 0;
933
	ei->i_es_shrink_lblk = 0;
934 935 936
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
937
	ei->i_da_metadata_calc_len = 0;
938
	ei->i_da_metadata_calc_last_lblock = 0;
939
	spin_lock_init(&(ei->i_block_reservation_lock));
940 941
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
942
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
943
#endif
944
	ei->jinode = NULL;
945
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
946
	spin_lock_init(&ei->i_completed_io_lock);
947 948
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
949
	atomic_set(&ei->i_unwritten, 0);
950
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
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
#ifdef CONFIG_EXT4_FS_ENCRYPTION
1029
	fscrypt_put_encryption_info(inode, NULL);
1030
#endif
1031 1032
}

C
Christoph Hellwig 已提交
1033
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1034
					u64 ino, u32 generation)
1035 1036 1037
{
	struct inode *inode;

1038
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1039
		return ERR_PTR(-ESTALE);
1040
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1041 1042 1043 1044
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1045
	 * ext4_read_inode will return a bad_inode if the inode had been
1046 1047 1048 1049 1050
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1051
	inode = ext4_iget_normal(sb, ino);
1052 1053 1054
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1055 1056 1057
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1058 1059 1060 1061 1062

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1063
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1064 1065 1066 1067 1068 1069
{
	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,
1070
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1071 1072 1073
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1074 1075
}

1076 1077 1078 1079 1080 1081
/*
 * 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.
 */
1082 1083
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1084 1085 1086 1087 1088 1089 1090 1091
{
	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,
1092
						wait & ~__GFP_DIRECT_RECLAIM);
1093 1094 1095
	return try_to_free_buffers(page);
}

1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
{
	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
				 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
}

static int ext4_key_prefix(struct inode *inode, u8 **key)
{
	*key = EXT4_SB(inode->i_sb)->key_prefix;
	return EXT4_SB(inode->i_sb)->key_prefix_size;
}

static int ext4_prepare_context(struct inode *inode)
{
	return ext4_convert_inline_data(inode);
}

static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
							void *fs_data)
{
	handle_t *handle;
	int res, res2;

	/* fs_data is null when internally used. */
	if (fs_data) {
		res  = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
				EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
				len, 0);
		if (!res) {
			ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
			ext4_clear_inode_state(inode,
					EXT4_STATE_MAY_INLINE_DATA);
		}
		return res;
	}

	handle = ext4_journal_start(inode, EXT4_HT_MISC,
			ext4_jbd2_credits_xattr(inode));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	res = ext4_xattr_set(inode, EXT4_XATTR_INDEX_ENCRYPTION,
			EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx,
			len, 0);
	if (!res) {
		ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
		res = ext4_mark_inode_dirty(handle, inode);
		if (res)
			EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
	}
	res2 = ext4_journal_stop(handle);
	if (!res)
		res = res2;
	return res;
}

static int ext4_dummy_context(struct inode *inode)
{
	return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
}

static unsigned ext4_max_namelen(struct inode *inode)
{
	return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
		EXT4_NAME_LEN;
}

static struct fscrypt_operations ext4_cryptops = {
	.get_context		= ext4_get_context,
	.key_prefix		= ext4_key_prefix,
	.prepare_context	= ext4_prepare_context,
	.set_context		= ext4_set_context,
	.dummy_context		= ext4_dummy_context,
	.is_encrypted		= ext4_encrypted_inode,
	.empty_dir		= ext4_empty_dir,
	.max_namelen		= ext4_max_namelen,
};
#else
static struct fscrypt_operations ext4_cryptops = {
	.is_encrypted		= ext4_encrypted_inode,
};
#endif

1180
#ifdef CONFIG_QUOTA
L
Li Xi 已提交
1181 1182
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
1183

1184 1185 1186 1187 1188
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);
1189
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1190
			 struct path *path);
1191
static int ext4_quota_off(struct super_block *sb, int type);
1192 1193
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,
1194
			       size_t len, loff_t off);
1195
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1196
				const char *data, size_t len, loff_t off);
1197 1198 1199
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);
1200
static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1201

J
Jan Kara 已提交
1202 1203 1204 1205 1206
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1207
static const struct dquot_operations ext4_quota_operations = {
1208
	.get_reserved_space = ext4_get_reserved_space,
1209 1210 1211 1212
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1213 1214 1215
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
L
Li Xi 已提交
1216
	.get_projid	= ext4_get_projid,
1217
	.get_next_id	= ext4_get_next_id,
1218 1219
};

1220
static const struct quotactl_ops ext4_qctl_operations = {
1221
	.quota_on	= ext4_quota_on,
1222
	.quota_off	= ext4_quota_off,
1223
	.quota_sync	= dquot_quota_sync,
1224
	.get_state	= dquot_get_state,
1225 1226
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
1227 1228
	.set_dqblk	= dquot_set_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
1229 1230 1231
};
#endif

1232
static const struct super_operations ext4_sops = {
1233 1234 1235 1236
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1237
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1238
	.evict_inode	= ext4_evict_inode,
1239 1240
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1241 1242
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1243 1244 1245
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1246
#ifdef CONFIG_QUOTA
1247 1248
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1249
	.get_dquots	= ext4_get_dquots,
1250
#endif
1251
	.bdev_try_to_free_page = bdev_try_to_free_page,
1252 1253
};

1254
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1255 1256
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1257
	.get_parent = ext4_get_parent,
1258 1259 1260 1261 1262
};

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,
1263
	Opt_nouid32, Opt_debug, Opt_removed,
1264
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1265
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1266 1267
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1268
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1269
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1270
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1271
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1272
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1273
	Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1274
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1275
	Opt_lazytime, Opt_nolazytime,
1276
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1277
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1278
	Opt_dioread_nolock, Opt_dioread_lock,
1279
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1280
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1281 1282
};

1283
static const match_table_t tokens = {
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
	{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"},
1298 1299
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1300 1301 1302 1303
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1304
	{Opt_noload, "norecovery"},
1305
	{Opt_noload, "noload"},
1306 1307
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1308
	{Opt_commit, "commit=%u"},
1309 1310
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1311
	{Opt_journal_dev, "journal_dev=%u"},
1312
	{Opt_journal_path, "journal_path=%s"},
1313
	{Opt_journal_checksum, "journal_checksum"},
1314
	{Opt_nojournal_checksum, "nojournal_checksum"},
1315
	{Opt_journal_async_commit, "journal_async_commit"},
1316 1317 1318 1319
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1320 1321
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1322 1323 1324 1325 1326 1327
	{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
1328
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1329 1330 1331 1332
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
1333
	{Opt_prjquota, "prjquota"},
1334
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1335 1336
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1337
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1338
	{Opt_dax, "dax"},
1339
	{Opt_stripe, "stripe=%u"},
1340
	{Opt_delalloc, "delalloc"},
1341 1342
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1343
	{Opt_nodelalloc, "nodelalloc"},
1344 1345
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1346 1347
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1348
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1349
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1350
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1351 1352
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1353 1354
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1355 1356
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1357 1358 1359
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1360
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1361
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1362 1363 1364 1365 1366
	{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
1367
	{Opt_err, NULL},
1368 1369
};

1370
static ext4_fsblk_t get_sb_block(void **data)
1371
{
1372
	ext4_fsblk_t	sb_block;
1373 1374 1375 1376
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1377

1378
	options += 3;
1379
	/* TODO: use simple_strtoll with >32bit ext4 */
1380 1381
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1382
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1383 1384 1385 1386 1387 1388
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1389

1390 1391 1392
	return sb_block;
}

1393
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1394 1395
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";
1396

D
Dmitry Monakhov 已提交
1397 1398 1399 1400 1401
#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;
1402
	int ret = -1;
D
Dmitry Monakhov 已提交
1403 1404 1405 1406 1407 1408

	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");
1409
		return -1;
D
Dmitry Monakhov 已提交
1410
	}
1411
	if (ext4_has_feature_quota(sb)) {
1412 1413 1414
		ext4_msg(sb, KERN_INFO, "Journaled quota options "
			 "ignored when QUOTA feature is enabled");
		return 1;
1415
	}
D
Dmitry Monakhov 已提交
1416 1417 1418 1419
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1420
		return -1;
D
Dmitry Monakhov 已提交
1421
	}
1422 1423 1424 1425 1426 1427 1428 1429
	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
1430
	}
1431
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1432 1433
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1434
		goto errout;
D
Dmitry Monakhov 已提交
1435
	}
1436
	sbi->s_qf_names[qtype] = qname;
1437
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1438
	return 1;
1439 1440 1441
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
}

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");
1453
		return -1;
D
Dmitry Monakhov 已提交
1454
	}
1455
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1456 1457 1458 1459 1460
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1461 1462 1463 1464 1465 1466
#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
1467
#ifdef CONFIG_QUOTA
1468 1469 1470 1471 1472
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1473
#endif
1474
#define MOPT_DATAJ	0x0080
1475 1476 1477
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1478
#define MOPT_STRING	0x0400
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490

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},
1491 1492 1493 1494
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1495 1496
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1497 1498 1499
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1500
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1501 1502
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1503
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1504
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1505
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1506
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1507
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1508
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1509 1510 1511
	{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},
1512
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1513
	 MOPT_NO_EXT2},
1514
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1515
	 MOPT_NO_EXT2},
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
	{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
1526
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1527
	{Opt_stripe, 0, MOPT_GTE0},
1528 1529
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1530 1531 1532
	{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},
1533 1534 1535 1536
	{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},
1537 1538
	{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
1539
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1540 1541
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1542
#else
1543 1544
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1545
#endif
1546 1547 1548 1549 1550 1551 1552
	{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},
1553 1554
	{Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
							MOPT_SET | MOPT_Q},
1555
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1556 1557
		       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
							MOPT_CLEAR | MOPT_Q},
1558 1559 1560 1561 1562 1563 1564
	{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},
1565
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1566
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1567 1568 1569 1570 1571 1572 1573 1574 1575
	{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;
1576 1577
	kuid_t uid;
	kgid_t gid;
1578 1579
	int arg = 0;

1580 1581 1582 1583 1584 1585 1586 1587 1588 1589
#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
1590
	switch (token) {
1591 1592 1593 1594
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1595 1596 1597
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1598
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1599 1600 1601 1602 1603 1604 1605
		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;
1606 1607 1608 1609 1610 1611
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1612 1613
	}

1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
	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;
	}

1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	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;
	}

1635
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1636 1637 1638
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1639 1640 1641
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1642 1643
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1644 1645 1646
		} else
			return -1;
	}
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
	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) {
1666 1667 1668 1669
		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");
1670
			return -1;
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
		}
		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);
1686 1687
			return -1;
		}
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
		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;
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
	} 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;
		}

1729
		journal_inode = d_inode(path.dentry);
1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
		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);
1741 1742 1743 1744 1745 1746 1747 1748
	} 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);
1749 1750 1751 1752 1753 1754 1755 1756 1757
	} 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
1758 1759 1760 1761 1762
	} 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) {
1763
				ext4_msg(sb, KERN_ERR,
1764 1765
					 "Cannot change data mode on remount");
				return -1;
1766
			}
1767
		} else {
1768 1769
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1770
		}
1771 1772 1773 1774 1775 1776 1777 1778
#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;
		}
1779
		if (ext4_has_feature_quota(sb)) {
1780 1781
			ext4_msg(sb, KERN_INFO,
				 "Quota format mount options ignored "
1782
				 "when QUOTA feature is enabled");
1783
			return 1;
1784
		}
1785
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1786 1787
#endif
	} else if (token == Opt_dax) {
1788 1789 1790 1791 1792
#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
1793 1794
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1795
#endif
1796 1797 1798 1799
	} 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;
1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814
	} 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;
1815
	}
1816
	return 1;
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838
}

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.
		 */
1839
		args[0].to = args[0].from = NULL;
1840 1841 1842 1843
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1844 1845
	}
#ifdef CONFIG_QUOTA
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	/*
	 * We do the test below only for project quotas. 'usrquota' and
	 * 'grpquota' mount options are allowed even without quota feature
	 * to support legacy quotas in quota files.
	 */
	if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
		ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
			 "Cannot enable project quota enforcement.");
		return 0;
	}
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1857
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1858
			clear_opt(sb, USRQUOTA);
1859

1860
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1861
			clear_opt(sb, GRPQUOTA);
1862

D
Dmitry Monakhov 已提交
1863
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1864 1865
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1866 1867 1868 1869
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1870 1871
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1872 1873 1874 1875
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1876 1877 1878 1879
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

1880
		if (blocksize < PAGE_SIZE) {
J
Jan Kara 已提交
1881 1882 1883 1884 1885
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1886 1887 1888 1889 1890 1891
	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;
	}
1892 1893 1894
	return 1;
}

1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
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])
1919
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1920 1921

	if (sbi->s_qf_names[GRPQUOTA])
1922
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1923 1924 1925
#endif
}

1926 1927
static const char *token2str(int token)
{
1928
	const struct match_token *t;
1929 1930 1931 1932 1933 1934 1935

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

1936 1937 1938 1939 1940
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1941 1942
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1943 1944 1945
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1946
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1947
	const struct mount_opts *m;
1948
	char sep = nodefs ? '\n' : ',';
1949

1950 1951
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1952 1953

	if (sbi->s_sb_block != 1)
1954 1955 1956 1957 1958 1959 1960
		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;
1961
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1962 1963 1964 1965 1966 1967
			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));
1968
	}
1969

1970
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1971
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1972 1973 1974
		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)) ||
1975
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1976 1977
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1978
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1979 1980
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1981
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1982
		SEQ_OPTS_PUTS("errors=continue");
1983
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1984
		SEQ_OPTS_PUTS("errors=panic");
1985
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1986
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1987
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1988
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1989
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1990
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1991
	if (sb->s_flags & MS_I_VERSION)
1992
		SEQ_OPTS_PUTS("i_version");
1993
	if (nodefs || sbi->s_stripe)
1994
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1995
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1996 1997 1998 1999 2000 2001 2002
		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");
	}
2003 2004
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2005 2006
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
2007

2008 2009
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2010
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2011 2012
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2013 2014
	if (test_opt(sb, DATA_ERR_ABORT))
		SEQ_OPTS_PUTS("data_err=abort");
2015 2016 2017 2018 2019

	ext4_show_quota_options(seq, sb);
	return 0;
}

2020 2021 2022 2023 2024
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

2025
int ext4_seq_options_show(struct seq_file *seq, void *offset)
2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
{
	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;
}

2036
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2037 2038
			    int read_only)
{
2039
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2040 2041
	int res = 0;

2042
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2043 2044
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
2045 2046 2047
		res = MS_RDONLY;
	}
	if (read_only)
2048
		goto done;
2049
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
2050 2051
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
2052
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
2053 2054 2055
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
2056
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2057 2058
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2059 2060 2061
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
2062 2063 2064
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2065 2066 2067
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
2068
	if (!sbi->s_journal)
2069
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2070
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2071
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
2072
	le16_add_cpu(&es->s_mnt_count, 1);
2073
	es->s_mtime = cpu_to_le32(get_seconds());
2074
	ext4_update_dynamic_rev(sb);
2075
	if (sbi->s_journal)
2076
		ext4_set_feature_journal_needs_recovery(sb);
2077

2078
	ext4_commit_super(sb, 1);
2079
done:
2080
	if (test_opt(sb, DEBUG))
2081
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2082
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2083 2084
			sb->s_blocksize,
			sbi->s_groups_count,
2085 2086
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
2087
			sbi->s_mount_opt, sbi->s_mount_opt2);
2088

D
Dan Magenheimer 已提交
2089
	cleancache_init_fs(sb);
2090 2091 2092
	return res;
}

2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
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
2118
		kvfree(sbi->s_flex_groups);
2119 2120 2121 2122 2123 2124
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

2125 2126 2127 2128 2129
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;
2130
	int i, err;
2131

2132
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2133
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2134 2135 2136 2137
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2138 2139
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2140
		goto failed;
2141 2142

	for (i = 0; i < sbi->s_groups_count; i++) {
2143
		gdp = ext4_get_group_desc(sb, i, NULL);
2144 2145

		flex_group = ext4_flex_group(sbi, i);
2146 2147
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2148 2149
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2150 2151
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2152 2153 2154 2155 2156 2157 2158
	}

	return 1;
failed:
	return 0;
}

2159
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2160
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2161
{
2162
	int offset = offsetof(struct ext4_group_desc, bg_checksum);
A
Andreas Dilger 已提交
2163
	__u16 crc = 0;
2164
	__le32 le_group = cpu_to_le32(block_group);
2165
	struct ext4_sb_info *sbi = EXT4_SB(sb);
A
Andreas Dilger 已提交
2166

2167
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2168 2169
		/* Use new metadata_csum algorithm */
		__u32 csum32;
2170
		__u16 dummy_csum = 0;
2171 2172 2173

		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
2174 2175 2176 2177 2178 2179 2180
		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);
2181 2182 2183

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2184 2185
	}

2186
	/* old crc16 code */
2187
	if (!ext4_has_feature_gdt_csum(sb))
2188 2189
		return 0;

2190 2191 2192 2193 2194
	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...*/
2195
	if (ext4_has_feature_64bit(sb) &&
2196 2197 2198 2199 2200 2201
	    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
2202 2203 2204
	return cpu_to_le16(crc);
}

2205
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2206 2207
				struct ext4_group_desc *gdp)
{
2208
	if (ext4_has_group_desc_csum(sb) &&
2209
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
A
Andreas Dilger 已提交
2210 2211 2212 2213 2214
		return 0;

	return 1;
}

2215 2216 2217 2218 2219
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;
2220
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2221 2222
}

2223
/* Called at mount-time, super-block is locked */
2224
static int ext4_check_descriptors(struct super_block *sb,
2225
				  ext4_fsblk_t sb_block,
2226
				  ext4_group_t *first_not_zeroed)
2227
{
2228 2229 2230
	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
2231 2232 2233
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2234
	int flexbg_flag = 0;
2235
	ext4_group_t i, grp = sbi->s_groups_count;
2236

2237
	if (ext4_has_feature_flex_bg(sb))
J
Jose R. Santos 已提交
2238 2239
		flexbg_flag = 1;

2240
	ext4_debug("Checking group descriptors");
2241

2242 2243 2244
	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
2245
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2246
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2247 2248
		else
			last_block = first_block +
2249
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2250

2251 2252 2253 2254
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2255
		block_bitmap = ext4_block_bitmap(sb, gdp);
2256 2257 2258 2259 2260
		if (block_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Block bitmap for group %u overlaps "
				 "superblock", i);
		}
2261
		if (block_bitmap < first_block || block_bitmap > last_block) {
2262
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2263
			       "Block bitmap for group %u not in group "
2264
			       "(block %llu)!", i, block_bitmap);
2265 2266
			return 0;
		}
2267
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2268 2269 2270 2271 2272
		if (inode_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode bitmap for group %u overlaps "
				 "superblock", i);
		}
2273
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2274
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2275
			       "Inode bitmap for group %u not in group "
2276
			       "(block %llu)!", i, inode_bitmap);
2277 2278
			return 0;
		}
2279
		inode_table = ext4_inode_table(sb, gdp);
2280 2281 2282 2283 2284
		if (inode_table == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode table for group %u overlaps "
				 "superblock", i);
		}
L
Laurent Vivier 已提交
2285
		if (inode_table < first_block ||
2286
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2287
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2288
			       "Inode table for group %u not in group "
2289
			       "(block %llu)!", i, inode_table);
2290 2291
			return 0;
		}
2292
		ext4_lock_group(sb, i);
2293
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2294 2295
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2296
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2297
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2298
			if (!(sb->s_flags & MS_RDONLY)) {
2299
				ext4_unlock_group(sb, i);
2300
				return 0;
2301
			}
A
Andreas Dilger 已提交
2302
		}
2303
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2304 2305
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2306
	}
2307 2308
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2309 2310 2311
	return 1;
}

2312
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
 * 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
2325
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2326 2327 2328
 * 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.
 */
2329 2330
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2331 2332
{
	unsigned int s_flags = sb->s_flags;
2333
	int ret, nr_orphans = 0, nr_truncates = 0;
2334 2335 2336 2337 2338 2339 2340 2341
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2342
	if (bdev_read_only(sb->s_bdev)) {
2343 2344
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2345 2346 2347
		return;
	}

2348 2349 2350 2351 2352 2353 2354
	/* 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;
	}

2355
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2356 2357
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2358
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2359
				  "clearing orphan list.\n");
2360 2361
			es->s_last_orphan = 0;
		}
2362 2363 2364 2365 2366
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2367
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2368 2369 2370 2371 2372 2373
		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
2374
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2375 2376
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2377
			if (ret < 0)
2378 2379 2380
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2381 2382 2383 2384 2385 2386 2387
		}
	}
#endif

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

2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
		/*
		 * We may have encountered an error during cleanup; if
		 * so, skip the rest.
		 */
		if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
			jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
			es->s_last_orphan = 0;
			break;
		}

2398 2399
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2400 2401 2402 2403
			es->s_last_orphan = 0;
			break;
		}

2404
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2405
		dquot_initialize(inode);
2406
		if (inode->i_nlink) {
2407 2408 2409 2410
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2411
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2412
				  inode->i_ino, inode->i_size);
A
Al Viro 已提交
2413
			inode_lock(inode);
2414
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2415 2416 2417
			ret = ext4_truncate(inode);
			if (ret)
				ext4_std_error(inode->i_sb, ret);
A
Al Viro 已提交
2418
			inode_unlock(inode);
2419 2420
			nr_truncates++;
		} else {
2421 2422 2423 2424
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2425 2426 2427 2428 2429 2430 2431
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2432
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2433 2434

	if (nr_orphans)
2435 2436
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2437
	if (nr_truncates)
2438 2439
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2440 2441
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2442
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2443
		if (sb_dqopt(sb)->files[i])
2444
			dquot_quota_off(sb, i);
2445 2446 2447 2448
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2449

2450 2451 2452 2453 2454 2455 2456
/*
 * 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.
 *
2457 2458 2459 2460 2461 2462
 * 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.
 *
2463 2464
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2465
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2466 2467 2468 2469 2470
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2471
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2472
		/*
2473
		 * CONFIG_LBDAF is not enabled implies the inode
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483
		 * 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;
	}

2484 2485 2486 2487 2488 2489
	/*
	 * 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;
2490 2491 2492 2493 2494 2495 2496 2497
	res <<= blkbits;

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

	return res;
}
2498 2499

/*
2500
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2501 2502
 * 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.
2503
 */
2504
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2505
{
2506
	loff_t res = EXT4_NDIR_BLOCKS;
2507 2508
	int meta_blocks;
	loff_t upper_limit;
2509 2510 2511 2512 2513 2514
	/* 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.
2515 2516
	 */

2517
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2518
		/*
2519
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2520 2521
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2522 2523 2524 2525 2526 2527 2528
		 */
		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
2529 2530 2531 2532 2533 2534
		/*
		 * 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
		 */
2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547
		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;
2548 2549 2550 2551 2552 2553 2554

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2555 2556 2557 2558

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2559 2560 2561
	return res;
}

2562
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2563
				   ext4_fsblk_t logical_sb_block, int nr)
2564
{
2565
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2566
	ext4_group_t bg, first_meta_bg;
2567 2568 2569 2570
	int has_super = 0;

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

2571
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2572
		return logical_sb_block + nr + 1;
2573
	bg = sbi->s_desc_per_block * nr;
2574
	if (ext4_bg_has_super(sb, bg))
2575
		has_super = 1;
2576

2577 2578 2579 2580 2581 2582 2583 2584 2585 2586
	/*
	 * 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++;

2587
	return (has_super + ext4_group_first_block_no(sb, bg));
2588 2589
}

2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605
/**
 * 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
2606
	int ret;
2607 2608

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2609 2610 2611 2612 2613 2614 2615
		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;
2616

D
Dan Ehrenberg 已提交
2617 2618 2619 2620 2621 2622
	/*
	 * 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;
2623

D
Dan Ehrenberg 已提交
2624
	return ret;
2625
}
2626

2627 2628 2629 2630 2631 2632 2633 2634
/*
 * 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)
{
2635
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646
		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;

2647
	if (ext4_has_feature_readonly(sb)) {
D
Darrick J. Wong 已提交
2648 2649 2650 2651 2652
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2653
	/* Check that feature set is OK for a read-write mount */
2654
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2655 2656 2657 2658 2659 2660 2661 2662 2663 2664
		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
	 */
2665
	if (ext4_has_feature_huge_file(sb)) {
2666 2667 2668 2669 2670 2671 2672
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2673
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2674 2675 2676 2677 2678
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2679 2680

#ifndef CONFIG_QUOTA
2681
	if (ext4_has_feature_quota(sb) && !readonly) {
2682 2683 2684 2685 2686
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
L
Li Xi 已提交
2687 2688 2689 2690 2691 2692
	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;
	}
2693
#endif  /* CONFIG_QUOTA */
2694 2695 2696
	return 1;
}

2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710
/*
 * 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)
2711 2712
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2713 2714
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2715
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2716 2717 2718 2719 2720
		       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)
2721
			printk(KERN_CONT ": inode %u",
2722 2723
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
2724
			printk(KERN_CONT ": block %llu", (unsigned long long)
2725
			       le64_to_cpu(es->s_first_error_block));
2726
		printk(KERN_CONT "\n");
2727 2728
	}
	if (es->s_last_error_time) {
2729
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2730 2731 2732 2733 2734
		       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)
2735
			printk(KERN_CONT ": inode %u",
2736 2737
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
2738
			printk(KERN_CONT ": block %llu", (unsigned long long)
2739
			       le64_to_cpu(es->s_last_error_block));
2740
		printk(KERN_CONT "\n");
2741 2742 2743 2744
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767
/* 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;

	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;
	}

2768
	if (group >= ngroups)
2769 2770 2771 2772 2773 2774 2775
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2776 2777
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2778 2779 2780 2781 2782 2783 2784 2785 2786 2787
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2788
 * request structure. Should be called with li_list_mtx held
2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
 */
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)
{
2806 2807 2808
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2809
		return;
2810
	}
2811 2812

	mutex_lock(&ext4_li_info->li_list_mtx);
2813
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2814
	mutex_unlock(&ext4_li_info->li_list_mtx);
2815
	mutex_unlock(&ext4_li_mtx);
2816 2817
}

2818 2819
static struct task_struct *ext4_lazyinit_task;

2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
/*
 * 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;
2834
	unsigned long next_wakeup, cur;
2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847

	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) {
2848 2849
			int err = 0;
			int progress = 0;
2850 2851 2852
			elr = list_entry(pos, struct ext4_li_request,
					 lr_request);

2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870
			if (time_before(jiffies, elr->lr_next_sched)) {
				if (time_before(elr->lr_next_sched, next_wakeup))
					next_wakeup = elr->lr_next_sched;
				continue;
			}
			if (down_read_trylock(&elr->lr_super->s_umount)) {
				if (sb_start_write_trylock(elr->lr_super)) {
					progress = 1;
					/*
					 * We hold sb->s_umount, sb can not
					 * be removed from the list, it is
					 * now safe to drop li_list_mtx
					 */
					mutex_unlock(&eli->li_list_mtx);
					err = ext4_run_li_request(elr);
					sb_end_write(elr->lr_super);
					mutex_lock(&eli->li_list_mtx);
					n = pos->next;
2871
				}
2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882
				up_read((&elr->lr_super->s_umount));
			}
			/* error, remove the lazy_init job */
			if (err) {
				ext4_remove_li_request(elr);
				continue;
			}
			if (!progress) {
				elr->lr_next_sched = jiffies +
					(prandom_u32()
					 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
2883 2884 2885 2886 2887 2888
			}
			if (time_before(elr->lr_next_sched, next_wakeup))
				next_wakeup = elr->lr_next_sched;
		}
		mutex_unlock(&eli->li_list_mtx);

2889
		try_to_freeze();
2890

2891 2892
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2893
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2894 2895 2896 2897
			cond_resched();
			continue;
		}

2898 2899
		schedule_timeout_interruptible(next_wakeup - cur);

2900 2901 2902 2903
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945
	}

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)
{
2946 2947 2948 2949
	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);
2950 2951 2952
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2953
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
				 "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.
	 */
3022 3023
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3024 3025 3026
	return elr;
}

3027 3028
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3029 3030
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3031
	struct ext4_li_request *elr = NULL;
3032
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3033
	int ret = 0;
3034

3035
	mutex_lock(&ext4_li_mtx);
3036 3037 3038 3039 3040 3041
	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;
3042
		goto out;
3043
	}
3044 3045 3046

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3047
	    !test_opt(sb, INIT_INODE_TABLE))
3048
		goto out;
3049 3050

	elr = ext4_li_request_new(sb, first_not_zeroed);
3051 3052 3053 3054
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066

	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;
3067 3068 3069 3070 3071 3072
	/*
	 * 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;
3073 3074 3075 3076 3077 3078 3079

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3080 3081
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095
		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.
	 */
3096
	if (!ext4_li_info || !ext4_lazyinit_task)
3097 3098
		return;

3099
	kthread_stop(ext4_lazyinit_task);
3100 3101
}

3102 3103 3104 3105 3106 3107
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);

3108
	if (ext4_has_metadata_csum(sb)) {
3109
		/* journal checksum v3 */
3110
		compat = 0;
3111
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3112 3113 3114 3115 3116 3117
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

3118 3119 3120 3121
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133
	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 {
3134 3135
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3136 3137 3138 3139 3140
	}

	return ret;
}

3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164
/*
 * 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;

3165
	if (!ext4_has_feature_bigalloc(sb))
3166 3167 3168
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215
	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;
3216 3217
	struct inode *j_inode;
	unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3218 3219
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
3220
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247

	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();
	}
3248 3249 3250 3251 3252

	/*
	 * Add the internal journal blocks whether the journal has been
	 * loaded or not
	 */
3253
	if (sbi->s_journal && !sbi->journal_bdev)
3254
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3255 3256 3257 3258 3259 3260 3261 3262 3263 3264
	else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
		j_inode = ext4_get_journal_inode(sb, j_inum);
		if (j_inode) {
			j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
			overhead += EXT4_NUM_B2C(sbi, j_blocks);
			iput(j_inode);
		} else {
			ext4_msg(sb, KERN_ERR, "can't get journal size");
		}
	}
3265 3266 3267 3268 3269 3270
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3271
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3272 3273
{
	ext4_fsblk_t resv_clusters;
3274
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3275

3276 3277 3278 3279 3280 3281
	/*
	 * 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.
	 */
3282
	if (!ext4_has_feature_extents(sb))
3283
		return;
L
Lukas Czerner 已提交
3284 3285 3286 3287
	/*
	 * 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
3288
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3289 3290 3291
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3292 3293
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3294 3295 3296 3297

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

3298
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3299 3300
}

3301
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3302
{
3303
	char *orig_data = kstrdup(data, GFP_KERNEL);
3304
	struct buffer_head *bh;
3305 3306 3307 3308
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3309
	ext4_fsblk_t logical_sb_block;
3310 3311 3312 3313
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3314
	const char *descr;
3315
	int ret = -ENOMEM;
3316
	int blocksize, clustersize;
3317 3318
	unsigned int db_count;
	unsigned int i;
3319
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3320
	__u64 blocks_count;
3321
	int err = 0;
3322
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3323
	ext4_group_t first_not_zeroed;
3324 3325 3326

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3327
		goto out_free_orig;
3328 3329 3330 3331 3332

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3333
		goto out_free_orig;
3334
	}
3335
	sb->s_fs_info = sbi;
3336
	sbi->s_sb = sb;
3337
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3338
	sbi->s_sb_block = sb_block;
3339 3340 3341
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3342

3343
	/* Cleanup superblock name */
3344
	strreplace(sb->s_id, '/', '!');
3345

3346
	/* -EINVAL is default */
3347
	ret = -EINVAL;
3348
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3349
	if (!blocksize) {
3350
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3351 3352 3353 3354
		goto out_fail;
	}

	/*
3355
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3356 3357
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3358
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3359 3360
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3361
	} else {
3362
		logical_sb_block = sb_block;
3363 3364
	}

3365
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3366
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3367 3368 3369 3370
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3371
	 *       some ext4 macro-instructions depend on its value
3372
	 */
3373
	es = (struct ext4_super_block *) (bh->b_data + offset);
3374 3375
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3376 3377
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3378
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3379

3380
	/* Warn if metadata_csum and gdt_csum are both set. */
3381 3382
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3383
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3384 3385
			     "redundant flags; please run fsck.");

3386 3387 3388 3389 3390 3391 3392 3393
	/* 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;
	}

3394
	/* Load the checksum driver */
3395
	if (ext4_has_feature_metadata_csum(sb)) {
3396 3397 3398 3399 3400 3401 3402 3403 3404
		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;
		}
	}

3405 3406 3407 3408 3409
	/* 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;
3410
		ret = -EFSBADCRC;
3411 3412 3413 3414
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3415
	if (ext4_has_feature_csum_seed(sb))
3416 3417
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3418 3419 3420
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3421 3422
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3423
	set_opt(sb, INIT_INODE_TABLE);
3424
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3425
		set_opt(sb, DEBUG);
3426
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3427
		set_opt(sb, GRPID);
3428
	if (def_mount_opts & EXT4_DEFM_UID16)
3429
		set_opt(sb, NO_UID32);
3430 3431
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3432
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3433
	set_opt(sb, POSIX_ACL);
3434
#endif
3435 3436 3437 3438
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3439
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3440
		set_opt(sb, JOURNAL_DATA);
3441
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3442
		set_opt(sb, ORDERED_DATA);
3443
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3444
		set_opt(sb, WRITEBACK_DATA);
3445 3446

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3447
		set_opt(sb, ERRORS_PANIC);
3448
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3449
		set_opt(sb, ERRORS_CONT);
3450
	else
3451
		set_opt(sb, ERRORS_RO);
3452 3453
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3454
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3455
		set_opt(sb, DISCARD);
3456

3457 3458
	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));
3459 3460 3461
	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;
3462

3463
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3464
		set_opt(sb, BARRIER);
3465

3466 3467 3468 3469
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3470
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3471
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3472
		set_opt(sb, DELALLOC);
3473

3474 3475 3476 3477 3478 3479
	/*
	 * 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;

3480
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3481
			   &journal_devnum, &journal_ioprio, 0)) {
3482 3483 3484 3485
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3486
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3487
	if (!parse_options((char *) data, sb, &journal_devnum,
3488
			   &journal_ioprio, 0))
3489 3490
		goto failed_mount;

3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501
	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 "
3502
				 "both data=journal and dioread_nolock");
3503 3504
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3505 3506 3507 3508 3509
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3510 3511
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3512 3513
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3514 3515
	}

3516
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3517
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3518

3519
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3520 3521 3522
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3523 3524 3525
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3526

3527 3528
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3529
		if (ext4_has_feature_64bit(sb)) {
3530 3531 3532 3533 3534 3535
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557
	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;
		}
	}

3558 3559 3560 3561 3562
	/*
	 * 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.
	 */
3563
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3564
		goto failed_mount;
3565

J
Jan Kara 已提交
3566
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3567 3568
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3569 3570
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3571 3572 3573
		goto failed_mount;
	}

3574 3575 3576 3577 3578 3579 3580
	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
3581
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3582 3583
		err = bdev_dax_supported(sb, blocksize);
		if (err)
R
Ross Zwisler 已提交
3584 3585 3586
			goto failed_mount;
	}

3587
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3588 3589 3590 3591 3592
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3593
	if (sb->s_blocksize != blocksize) {
3594 3595
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3596
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3597
					blocksize);
3598 3599 3600
			goto failed_mount;
		}

3601
		brelse(bh);
3602 3603
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3604
		bh = sb_bread_unmovable(sb, logical_sb_block);
3605
		if (!bh) {
3606 3607
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3608 3609
			goto failed_mount;
		}
3610
		es = (struct ext4_super_block *)(bh->b_data + offset);
3611
		sbi->s_es = es;
3612
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3613 3614
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3615 3616 3617 3618
			goto failed_mount;
		}
	}

3619
	has_huge_files = ext4_has_feature_huge_file(sb);
3620 3621 3622
	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);
3623

3624 3625 3626
	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;
3627 3628 3629
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3630
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3631
		    (!is_power_of_2(sbi->s_inode_size)) ||
3632
		    (sbi->s_inode_size > blocksize)) {
3633 3634
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3635
			       sbi->s_inode_size);
3636 3637
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3638 3639
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3640
	}
3641

3642
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3643
	if (ext4_has_feature_64bit(sb)) {
3644
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3645
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3646
		    !is_power_of_2(sbi->s_desc_size)) {
3647 3648
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3649 3650 3651 3652 3653
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3654

3655 3656
	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);
3657
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3658
		goto cantfind_ext4;
3659

3660
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3661
	if (sbi->s_inodes_per_block == 0)
3662
		goto cantfind_ext4;
3663 3664
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3665
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3666 3667
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3668 3669
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3670

3671
	for (i = 0; i < 4; i++)
3672 3673
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3674
	if (ext4_has_feature_dir_index(sb)) {
3675 3676 3677 3678
		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) {
3679
#ifdef __CHAR_UNSIGNED__
3680 3681 3682 3683
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3684
#else
3685 3686 3687
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3688
#endif
3689
		}
3690
	}
3691

3692 3693
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3694
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734
	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;
3735
	}
3736 3737
	sbi->s_cluster_ratio = clustersize / blocksize;

3738
	if (sbi->s_inodes_per_group > blocksize * 8) {
3739 3740
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3741
		       sbi->s_inodes_per_group);
3742 3743 3744
		goto failed_mount;
	}

3745 3746 3747 3748
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3749 3750 3751 3752
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3753
	err = generic_check_addressable(sb->s_blocksize_bits,
3754
					ext4_blocks_count(es));
3755
	if (err) {
3756
		ext4_msg(sb, KERN_ERR, "filesystem"
3757
			 " too large to mount safely on this system");
3758
		if (sizeof(sector_t) < 8)
3759
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3760 3761 3762
		goto failed_mount;
	}

3763 3764
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3765

3766 3767 3768
	/* 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) {
3769 3770
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3771 3772 3773 3774
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3775 3776 3777 3778 3779
	/*
	 * 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)) {
3780
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3781 3782 3783
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3784 3785
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3786 3787 3788 3789
	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));
3790
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3791
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3792
		       "(block count %llu, first data block %u, "
3793
		       "blocks per group %lu)", sbi->s_groups_count,
3794 3795 3796 3797 3798
		       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
3799
	sbi->s_groups_count = blocks_count;
3800 3801
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3802 3803
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3804 3805 3806
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3807
	if (sbi->s_group_desc == NULL) {
3808
		ext4_msg(sb, KERN_ERR, "not enough memory");
3809
		ret = -ENOMEM;
3810 3811 3812
		goto failed_mount;
	}

3813
	bgl_lock_init(sbi->s_blockgroup_lock);
3814 3815

	for (i = 0; i < db_count; i++) {
3816
		block = descriptor_loc(sb, logical_sb_block, i);
3817
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3818
		if (!sbi->s_group_desc[i]) {
3819 3820
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3821 3822 3823 3824
			db_count = i;
			goto failed_mount2;
		}
	}
3825
	if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
3826
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3827
		ret = -EFSCORRUPTED;
3828
		goto failed_mount2;
3829
	}
3830

3831
	sbi->s_gdb_count = db_count;
3832 3833 3834
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3835 3836
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3837

3838
	/* Register extent status tree shrinker */
3839
	if (ext4_es_register_shrinker(sbi))
3840 3841
		goto failed_mount3;

3842
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3843
	sbi->s_extent_max_zeroout_kb = 32;
3844

3845 3846 3847
	/*
	 * set up enough so that it can read an inode
	 */
3848
	sb->s_op = &ext4_sops;
3849 3850
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3851
	sb->s_cop = &ext4_cryptops;
3852
#ifdef CONFIG_QUOTA
3853
	sb->dq_op = &ext4_quota_operations;
3854
	if (ext4_has_feature_quota(sb))
3855
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3856 3857
	else
		sb->s_qcop = &ext4_qctl_operations;
L
Li Xi 已提交
3858
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3859
#endif
3860 3861
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3862
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3863
	mutex_init(&sbi->s_orphan_lock);
3864 3865 3866 3867

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3868
			  ext4_has_feature_journal_needs_recovery(sb));
3869

3870
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3871
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3872
			goto failed_mount3a;
3873

3874 3875 3876 3877
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3878
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3879
		if (ext4_load_journal(sb, es, journal_devnum))
3880
			goto failed_mount3a;
3881
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3882
		   ext4_has_feature_journal_needs_recovery(sb)) {
3883 3884
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3885
		goto failed_mount_wq;
3886
	} else {
3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910 3911
		/* 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);
3912
		clear_opt(sb, DATA_FLAGS);
3913 3914 3915
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3916 3917
	}

3918
	if (ext4_has_feature_64bit(sb) &&
3919 3920
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3921
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3922
		goto failed_mount_wq;
3923 3924
	}

3925 3926 3927 3928
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3929
	}
3930

3931 3932 3933 3934 3935
	/* 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
3936 3937 3938
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3939 3940
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3941
			set_opt(sb, ORDERED_DATA);
3942
		else
3943
			set_opt(sb, JOURNAL_DATA);
3944 3945
		break;

3946 3947
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3948 3949
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3950 3951
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3952
			goto failed_mount_wq;
3953 3954 3955 3956
		}
	default:
		break;
	}
3957
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3958

B
Bobi Jam 已提交
3959 3960
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3961
no_journal:
3962 3963 3964 3965
	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;
3966 3967
	}

3968
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
3969
	    (blocksize != PAGE_SIZE)) {
3970 3971 3972 3973 3974
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

3975 3976 3977
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
3978 3979 3980
		ext4_commit_super(sb, 1);
	}

3981 3982 3983 3984 3985 3986 3987
	/*
	 * 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 {
3988 3989
		err = ext4_calculate_overhead(sb);
		if (err)
3990 3991 3992
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3993 3994 3995 3996
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3997 3998 3999 4000
	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");
4001
		ret = -ENOMEM;
4002 4003 4004
		goto failed_mount4;
	}

4005
	/*
4006
	 * The jbd2_journal_load will have done any necessary log recovery,
4007 4008 4009
	 * so we can safely mount the rest of the filesystem now.
	 */

4010 4011
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4012
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4013
		ret = PTR_ERR(root);
4014
		root = NULL;
4015 4016 4017
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4018
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4019
		iput(root);
4020 4021
		goto failed_mount4;
	}
4022
	sb->s_root = d_make_root(root);
4023
	if (!sb->s_root) {
4024
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4025 4026 4027
		ret = -ENOMEM;
		goto failed_mount4;
	}
4028

4029 4030
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4031 4032 4033 4034 4035

	/* 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;
4036
		if (ext4_has_feature_extra_isize(sb)) {
K
Kalpak Shah 已提交
4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051
			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;
4052 4053
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4054 4055
	}

4056
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
4057

4058 4059
	err = ext4_setup_system_zone(sb);
	if (err) {
4060
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4061
			 "zone (%d)", err);
4062 4063 4064 4065 4066 4067 4068 4069
		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);
4070
		goto failed_mount5;
4071 4072
	}

4073 4074 4075
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
4076 4077
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
4078 4079 4080
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4081 4082
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
4083 4084 4085
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
4086
					  ext4_count_dirs(sb), GFP_KERNEL);
4087
	if (!err)
4088 4089
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
4090 4091 4092
	if (!err)
		err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);

4093 4094 4095 4096 4097
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

4098
	if (ext4_has_feature_flex_bg(sb))
4099 4100 4101 4102 4103 4104 4105
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

4106 4107
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4108
		goto failed_mount6;
4109

4110
	err = ext4_register_sysfs(sb);
4111 4112
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4113

4114 4115
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
4116
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
4117 4118 4119 4120 4121 4122
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

4123 4124 4125
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4126
	if (needs_recovery) {
4127
		ext4_msg(sb, KERN_INFO, "recovery complete");
4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
		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";

4140 4141 4142 4143 4144 4145 4146 4147
	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");
	}

4148 4149 4150 4151
	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);
4152

4153 4154
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4155

4156 4157 4158 4159 4160
	/* 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);

4161
	kfree(orig_data);
4162 4163 4164 4165 4166
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	memcpy(sbi->key_prefix, EXT4_KEY_DESC_PREFIX,
				EXT4_KEY_DESC_PREFIX_SIZE);
	sbi->key_prefix_size = EXT4_KEY_DESC_PREFIX_SIZE;
#endif
4167 4168
	return 0;

4169
cantfind_ext4:
4170
	if (!silent)
4171
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4172 4173
	goto failed_mount;

4174 4175
#ifdef CONFIG_QUOTA
failed_mount8:
4176
	ext4_unregister_sysfs(sb);
4177
#endif
4178 4179 4180
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4181
	ext4_mb_release(sb);
4182
	if (sbi->s_flex_groups)
A
Al Viro 已提交
4183
		kvfree(sbi->s_flex_groups);
4184 4185 4186 4187
	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);
4188
failed_mount5:
4189 4190 4191
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4192
	dput(sb->s_root);
4193
	sb->s_root = NULL;
A
Al Viro 已提交
4194
failed_mount4:
4195
	ext4_msg(sb, KERN_ERR, "mount failed");
4196 4197
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4198
failed_mount_wq:
J
Jan Kara 已提交
4199 4200 4201 4202
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
4203 4204 4205 4206
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4207
failed_mount3a:
4208
	ext4_es_unregister_shrinker(sbi);
4209
failed_mount3:
4210
	del_timer_sync(&sbi->s_err_report);
4211 4212
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4213 4214 4215
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
4216
	kvfree(sbi->s_group_desc);
4217
failed_mount:
4218 4219
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4220
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4221
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4222 4223
		kfree(sbi->s_qf_names[i]);
#endif
4224
	ext4_blkdev_remove(sbi);
4225 4226 4227
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4228
	kfree(sbi->s_blockgroup_lock);
4229
	kfree(sbi);
4230
out_free_orig:
4231
	kfree(orig_data);
4232
	return err ? err : ret;
4233 4234 4235 4236 4237 4238 4239
}

/*
 * 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.
 */
4240
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4241
{
4242
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4243

4244 4245 4246
	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;
4247

4248
	write_lock(&journal->j_state_lock);
4249
	if (test_opt(sb, BARRIER))
4250
		journal->j_flags |= JBD2_BARRIER;
4251
	else
4252
		journal->j_flags &= ~JBD2_BARRIER;
4253 4254 4255 4256
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4257
	write_unlock(&journal->j_state_lock);
4258 4259
}

4260 4261
static struct inode *ext4_get_journal_inode(struct super_block *sb,
					     unsigned int journal_inum)
4262 4263 4264
{
	struct inode *journal_inode;

4265 4266 4267 4268 4269
	/*
	 * 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.
	 */
4270 4271
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4272
		ext4_msg(sb, KERN_ERR, "no journal found");
4273 4274 4275 4276 4277
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4278
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4279 4280 4281
		return NULL;
	}

4282
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4283
		  journal_inode, journal_inode->i_size);
4284
	if (!S_ISREG(journal_inode->i_mode)) {
4285
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4286 4287 4288
		iput(journal_inode);
		return NULL;
	}
4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302
	return journal_inode;
}

static journal_t *ext4_get_journal(struct super_block *sb,
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

	BUG_ON(!ext4_has_feature_journal(sb));

	journal_inode = ext4_get_journal_inode(sb, journal_inum);
	if (!journal_inode)
		return NULL;
4303

4304
	journal = jbd2_journal_init_inode(journal_inode);
4305
	if (!journal) {
4306
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4307 4308 4309 4310
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4311
	ext4_init_journal_params(sb, journal);
4312 4313 4314
	return journal;
}

4315
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4316 4317
				       dev_t j_dev)
{
4318
	struct buffer_head *bh;
4319
	journal_t *journal;
4320 4321
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4322
	int hblock, blocksize;
4323
	ext4_fsblk_t sb_block;
4324
	unsigned long offset;
4325
	struct ext4_super_block *es;
4326 4327
	struct block_device *bdev;

4328
	BUG_ON(!ext4_has_feature_journal(sb));
4329

4330
	bdev = ext4_blkdev_get(j_dev, sb);
4331 4332 4333 4334
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4335
	hblock = bdev_logical_block_size(bdev);
4336
	if (blocksize < hblock) {
4337 4338
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4339 4340 4341
		goto out_bdev;
	}

4342 4343
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4344 4345
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4346 4347
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4348 4349 4350
		goto out_bdev;
	}

4351
	es = (struct ext4_super_block *) (bh->b_data + offset);
4352
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4353
	    !(le32_to_cpu(es->s_feature_incompat) &
4354
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4355 4356
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4357 4358 4359 4360
		brelse(bh);
		goto out_bdev;
	}

4361 4362 4363 4364 4365 4366 4367 4368 4369
	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;
	}

4370
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4371
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4372 4373 4374 4375
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4376
	len = ext4_blocks_count(es);
4377 4378 4379
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4380
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4381 4382
					start, len, blocksize);
	if (!journal) {
4383
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4384 4385 4386
		goto out_bdev;
	}
	journal->j_private = sb;
4387
	ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4388 4389
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4390
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4391 4392 4393
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4394 4395
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4396 4397 4398
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4399 4400
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4401
	return journal;
4402

4403
out_journal:
4404
	jbd2_journal_destroy(journal);
4405
out_bdev:
4406
	ext4_blkdev_put(bdev);
4407 4408 4409
	return NULL;
}

4410 4411
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4412 4413 4414 4415 4416 4417 4418 4419
			     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;

4420
	BUG_ON(!ext4_has_feature_journal(sb));
4421

4422 4423
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4424 4425
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436
		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.
	 */
4437
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4438
		if (sb->s_flags & MS_RDONLY) {
4439 4440
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4441
			if (really_read_only) {
4442 4443
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4444 4445
				return -EROFS;
			}
4446 4447
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4448 4449 4450 4451
		}
	}

	if (journal_inum && journal_dev) {
4452 4453
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4454 4455 4456 4457
		return -EINVAL;
	}

	if (journal_inum) {
4458
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4459 4460
			return -EINVAL;
	} else {
4461
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4462 4463 4464
			return -EINVAL;
	}

4465
	if (!(journal->j_flags & JBD2_BARRIER))
4466
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4467

4468
	if (!ext4_has_feature_journal_needs_recovery(sb))
4469
		err = jbd2_journal_wipe(journal, !really_read_only);
4470 4471 4472 4473 4474
	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);
4475
		err = jbd2_journal_load(journal);
4476 4477 4478 4479 4480
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4481 4482

	if (err) {
4483
		ext4_msg(sb, KERN_ERR, "error loading journal");
4484
		jbd2_journal_destroy(journal);
4485 4486 4487
		return err;
	}

4488 4489
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4490

4491
	if (!really_read_only && journal_devnum &&
4492 4493 4494 4495
	    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. */
4496
		ext4_commit_super(sb, 1);
4497 4498 4499 4500 4501
	}

	return 0;
}

4502
static int ext4_commit_super(struct super_block *sb, int sync)
4503
{
4504
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4505
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4506
	int error = 0;
4507

4508
	if (!sbh || block_device_ejected(sb))
4509
		return error;
4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521
	/*
	 * 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());
4522 4523 4524
	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
4525 4526
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4527 4528 4529
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4530 4531
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4532 4533
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4534 4535 4536
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4537
				&EXT4_SB(sb)->s_freeinodes_counter));
4538
	BUFFER_TRACE(sbh, "marking dirty");
4539
	ext4_superblock_csum_set(sb);
4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554
	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);
	}
4555
	mark_buffer_dirty(sbh);
4556
	unlock_buffer(sbh);
4557
	if (sync) {
4558 4559
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4560 4561 4562 4563 4564
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4565 4566
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4567 4568 4569 4570
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4571
	return error;
4572 4573 4574 4575 4576 4577 4578
}

/*
 * 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.
 */
4579 4580
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4581
{
4582
	journal_t *journal = EXT4_SB(sb)->s_journal;
4583

4584
	if (!ext4_has_feature_journal(sb)) {
4585 4586 4587
		BUG_ON(journal != NULL);
		return;
	}
4588
	jbd2_journal_lock_updates(journal);
4589 4590 4591
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4592
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4593
	    sb->s_flags & MS_RDONLY) {
4594
		ext4_clear_feature_journal_needs_recovery(sb);
4595
		ext4_commit_super(sb, 1);
4596
	}
4597 4598

out:
4599
	jbd2_journal_unlock_updates(journal);
4600 4601 4602 4603 4604 4605 4606
}

/*
 * 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.
 */
4607 4608
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4609 4610 4611 4612 4613
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4614
	BUG_ON(!ext4_has_feature_journal(sb));
4615

4616
	journal = EXT4_SB(sb)->s_journal;
4617 4618 4619

	/*
	 * Now check for any error status which may have been recorded in the
4620
	 * journal by a prior ext4_error() or ext4_abort()
4621 4622
	 */

4623
	j_errno = jbd2_journal_errno(journal);
4624 4625 4626
	if (j_errno) {
		char nbuf[16];

4627
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4628
		ext4_warning(sb, "Filesystem error recorded "
4629
			     "from previous mount: %s", errstr);
4630
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4631

4632 4633
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4634
		ext4_commit_super(sb, 1);
4635

4636
		jbd2_journal_clear_err(journal);
4637
		jbd2_journal_update_sb_errno(journal);
4638 4639 4640 4641 4642 4643 4644
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4645
int ext4_force_commit(struct super_block *sb)
4646 4647 4648 4649 4650 4651
{
	journal_t *journal;

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

4652
	journal = EXT4_SB(sb)->s_journal;
4653
	return ext4_journal_force_commit(journal);
4654 4655
}

4656
static int ext4_sync_fs(struct super_block *sb, int wait)
4657
{
4658
	int ret = 0;
4659
	tid_t target;
4660
	bool needs_barrier = false;
4661
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4662

4663
	trace_ext4_sync_fs(sb, wait);
4664
	flush_workqueue(sbi->rsv_conversion_wq);
4665 4666 4667 4668 4669
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4670 4671 4672 4673 4674
	/*
	 * 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.
	 */
4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686
	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))
4687 4688 4689 4690 4691 4692
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4693
	}
4694 4695 4696 4697

	return ret;
}

4698 4699 4700
/*
 * 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.
4701 4702
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4703 4704
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4705
 */
4706
static int ext4_freeze(struct super_block *sb)
4707
{
4708 4709
	int error = 0;
	journal_t *journal;
4710

4711 4712
	if (sb->s_flags & MS_RDONLY)
		return 0;
4713

4714
	journal = EXT4_SB(sb)->s_journal;
4715

4716 4717 4718
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4719

4720 4721 4722 4723 4724 4725 4726
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4727 4728

		/* Journal blocked and flushed, clear needs_recovery flag. */
4729
		ext4_clear_feature_journal_needs_recovery(sb);
4730
	}
4731 4732

	error = ext4_commit_super(sb, 1);
4733
out:
4734 4735 4736
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4737
	return error;
4738 4739 4740 4741 4742 4743
}

/*
 * 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.
 */
4744
static int ext4_unfreeze(struct super_block *sb)
4745
{
4746 4747 4748
	if (sb->s_flags & MS_RDONLY)
		return 0;

4749 4750
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4751
		ext4_set_feature_journal_needs_recovery(sb);
4752 4753
	}

4754
	ext4_commit_super(sb, 1);
4755
	return 0;
4756 4757
}

4758 4759 4760 4761 4762
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4763
	unsigned long s_mount_opt2;
4764 4765
	kuid_t s_resuid;
	kgid_t s_resgid;
4766 4767 4768 4769
	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
4770
	char *s_qf_names[EXT4_MAXQUOTAS];
4771 4772 4773
#endif
};

4774
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4775
{
4776
	struct ext4_super_block *es;
4777
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4778
	unsigned long old_sb_flags;
4779
	struct ext4_mount_options old_opts;
4780
	int enable_quota = 0;
4781
	ext4_group_t g;
4782
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4783
	int err = 0;
4784
#ifdef CONFIG_QUOTA
4785
	int i, j;
4786
#endif
4787
	char *orig_data = kstrdup(data, GFP_KERNEL);
4788 4789 4790 4791

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4792
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4793 4794 4795
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4796 4797
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4798 4799
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4800
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4801 4802 4803 4804 4805 4806
		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]);
4807
				kfree(orig_data);
4808 4809 4810 4811
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4812
#endif
4813 4814
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4815

4816
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4817 4818 4819 4820
		err = -EINVAL;
		goto restore_opts;
	}

4821
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4822 4823
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4824 4825
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4826 4827
	}

4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840
	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
4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852
		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;
4853 4854
	}

4855
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4856
		ext4_abort(sb, "Abort forced by user");
4857 4858

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4859
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4860 4861 4862

	es = sbi->s_es;

4863
	if (sbi->s_journal) {
4864
		ext4_init_journal_params(sb, sbi->s_journal);
4865 4866
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4867

4868 4869 4870
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4871
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4872
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4873 4874 4875 4876 4877
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4878 4879 4880
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4881 4882
			err = dquot_suspend(sb, -1);
			if (err < 0)
4883 4884
				goto restore_opts;

4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895
			/*
			 * 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.
			 */
4896 4897
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4898 4899
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4900
			if (sbi->s_journal)
4901
				ext4_mark_recovery_complete(sb, es);
4902
		} else {
4903
			/* Make sure we can mount this feature set readwrite */
4904
			if (ext4_has_feature_readonly(sb) ||
D
Darrick J. Wong 已提交
4905
			    !ext4_feature_set_ok(sb, 0)) {
4906 4907 4908
				err = -EROFS;
				goto restore_opts;
			}
4909 4910
			/*
			 * Make sure the group descriptor checksums
4911
			 * are sane.  If they aren't, refuse to remount r/w.
4912 4913 4914 4915 4916
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4917
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4918 4919
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4920
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
4921
					       le16_to_cpu(gdp->bg_checksum));
4922
					err = -EFSBADCRC;
4923 4924 4925 4926
					goto restore_opts;
				}
			}

4927 4928 4929 4930 4931 4932
			/*
			 * 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) {
4933
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4934 4935
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4936
				       "umount/remount instead");
4937 4938 4939 4940
				err = -EINVAL;
				goto restore_opts;
			}

4941 4942 4943 4944 4945 4946
			/*
			 * 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.)
			 */
4947 4948
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4949
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4950
			if (!ext4_setup_super(sb, es, 0))
4951
				sb->s_flags &= ~MS_RDONLY;
4952
			if (ext4_has_feature_mmp(sb))
4953 4954 4955 4956 4957
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4958
			enable_quota = 1;
4959 4960
		}
	}
4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973

	/*
	 * 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);
	}

4974
	ext4_setup_system_zone(sb);
4975
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4976
		ext4_commit_super(sb, 1);
4977

4978 4979
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4980
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4981
		kfree(old_opts.s_qf_names[i]);
4982 4983 4984
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
4985
		else if (ext4_has_feature_quota(sb)) {
4986
			err = ext4_enable_quotas(sb);
4987
			if (err)
4988 4989 4990
				goto restore_opts;
		}
	}
4991
#endif
4992

4993
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4994 4995
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4996
	return 0;
4997

4998 4999 5000
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
5001
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5002 5003 5004
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
5005 5006
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
5007 5008
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
5009
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5010
		kfree(sbi->s_qf_names[i]);
5011 5012 5013
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5014
	kfree(orig_data);
5015 5016 5017
	return err;
}

L
Li Xi 已提交
5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059
#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

5060
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5061 5062
{
	struct super_block *sb = dentry->d_sb;
5063 5064
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5065
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5066
	u64 fsid;
5067
	s64 bfree;
L
Lukas Czerner 已提交
5068
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5069

5070 5071
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5072

5073
	buf->f_type = EXT4_SUPER_MAGIC;
5074
	buf->f_bsize = sb->s_blocksize;
5075
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5076 5077
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5078
	/* prevent underflow in case that few free space is available */
5079
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5080 5081 5082
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5083 5084
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5085
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5086
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5087 5088 5089 5090
	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;
5091

L
Li Xi 已提交
5092 5093 5094 5095 5096
#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
5097 5098 5099
	return 0;
}

5100 5101
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5102
 * Process 1                         Process 2
5103
 * ext4_create()                     quota_sync()
5104
 *   jbd2_journal_start()                  write_dquot()
5105
 *   dquot_initialize()                         down(dqio_mutex)
5106
 *     down(dqio_mutex)                    jbd2_journal_start()
5107 5108 5109 5110 5111 5112 5113
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5114
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5115 5116
}

5117
static int ext4_write_dquot(struct dquot *dquot)
5118 5119 5120 5121 5122 5123
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5124
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5125
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5126 5127 5128
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5129
	err = ext4_journal_stop(handle);
5130 5131 5132 5133 5134
	if (!ret)
		ret = err;
	return ret;
}

5135
static int ext4_acquire_dquot(struct dquot *dquot)
5136 5137 5138 5139
{
	int ret, err;
	handle_t *handle;

5140
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5141
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5142 5143 5144
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5145
	err = ext4_journal_stop(handle);
5146 5147 5148 5149 5150
	if (!ret)
		ret = err;
	return ret;
}

5151
static int ext4_release_dquot(struct dquot *dquot)
5152 5153 5154 5155
{
	int ret, err;
	handle_t *handle;

5156
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5157
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5158 5159 5160
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5161
		return PTR_ERR(handle);
J
Jan Kara 已提交
5162
	}
5163
	ret = dquot_release(dquot);
5164
	err = ext4_journal_stop(handle);
5165 5166 5167 5168 5169
	if (!ret)
		ret = err;
	return ret;
}

5170
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5171
{
5172 5173 5174
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5175
	/* Are we journaling quotas? */
5176
	if (ext4_has_feature_quota(sb) ||
5177
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5178
		dquot_mark_dquot_dirty(dquot);
5179
		return ext4_write_dquot(dquot);
5180 5181 5182 5183 5184
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5185
static int ext4_write_info(struct super_block *sb, int type)
5186 5187 5188 5189 5190
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5191
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5192 5193 5194
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5195
	err = ext4_journal_stop(handle);
5196 5197 5198 5199 5200 5201 5202 5203 5204
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5205
static int ext4_quota_on_mount(struct super_block *sb, int type)
5206
{
5207 5208
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5209 5210
}

5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224
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);
}

5225 5226 5227
/*
 * Standard function to be called on quota_on
 */
5228
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5229
			 struct path *path)
5230 5231 5232 5233 5234
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5235

5236
	/* Quotafile not on the same filesystem? */
5237
	if (path->dentry->d_sb != sb)
5238
		return -EXDEV;
5239 5240
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5241
		/* Quotafile not in fs root? */
5242
		if (path->dentry->d_parent != sb->s_root)
5243 5244 5245
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5246
	}
5247 5248 5249 5250 5251

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5252
	if (EXT4_SB(sb)->s_journal &&
5253
	    ext4_should_journal_data(d_inode(path->dentry))) {
5254 5255 5256 5257 5258
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5259
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5260
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5261
		if (err)
5262
			return err;
5263
	}
5264 5265 5266 5267 5268 5269
	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;
5270 5271
}

5272 5273 5274 5275 5276
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
5277
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5278
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5279 5280
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5281 5282
	};

5283
	BUG_ON(!ext4_has_feature_quota(sb));
5284 5285 5286 5287 5288 5289 5290 5291 5292 5293

	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
5294 5295
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5296
	lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5297 5298
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);
5299 5300
	if (err)
		lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5301 5302 5303 5304 5305 5306 5307 5308

	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
5309
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5310
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5311 5312
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5313
	};
5314 5315 5316 5317 5318
	bool quota_mopt[EXT4_MAXQUOTAS] = {
		test_opt(sb, USRQUOTA),
		test_opt(sb, GRPQUOTA),
		test_opt(sb, PRJQUOTA),
	};
5319 5320

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5321
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5322 5323
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5324 5325
				DQUOT_USAGE_ENABLED |
				(quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5326 5327
			if (err) {
				ext4_warning(sb,
5328 5329 5330
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5331 5332 5333 5334 5335 5336 5337
				return err;
			}
		}
	}
	return 0;
}

5338 5339
static int ext4_quota_off(struct super_block *sb, int type)
{
5340 5341 5342
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5343 5344 5345
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5346 5347
		sync_filesystem(sb);

5348 5349 5350
	if (!inode)
		goto out;

5351 5352
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5353
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5354 5355 5356 5357 5358 5359 5360
	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:
5361 5362 5363
	return dquot_quota_off(sb, type);
}

5364 5365
/* 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
5366
 * itself serializes the operations (and no one else should touch the files)
5367
 * we don't have to be afraid of races */
5368
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5369 5370 5371
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5372
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384 5385 5386
	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;
5387 5388 5389
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404
		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) */
5405
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5406 5407 5408
				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
5409
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5410
	int err, offset = off & (sb->s_blocksize - 1);
5411
	int retries = 0;
5412 5413 5414
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5415
	if (EXT4_SB(sb)->s_journal && !handle) {
5416 5417
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5418 5419 5420
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431
	/*
	 * 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;
	}

5432 5433 5434 5435 5436 5437
	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));
5438 5439
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5440 5441
	if (!bh)
		goto out;
5442
	BUFFER_TRACE(bh, "get write access");
5443 5444 5445
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5446
		return err;
5447
	}
5448 5449 5450 5451
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5452
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5453
	brelse(bh);
5454
out:
5455 5456
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5457
		EXT4_I(inode)->i_disksize = inode->i_size;
5458
		ext4_mark_inode_dirty(handle, inode);
5459
	}
5460
	return len;
5461 5462
}

5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473
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);
}
5474 5475
#endif

A
Al Viro 已提交
5476 5477
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5478
{
A
Al Viro 已提交
5479
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5480 5481
}

J
Jan Kara 已提交
5482
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494
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);
}
5495 5496 5497

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5498
	if (ext4_has_unknown_ext2_incompat_features(sb))
5499 5500 5501
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5502
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5503 5504 5505
		return 0;
	return 1;
}
5506 5507 5508
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5509
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523
#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);
}
5524 5525 5526

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5527
	if (ext4_has_unknown_ext3_incompat_features(sb))
5528
		return 0;
5529
	if (!ext4_has_feature_journal(sb))
5530 5531 5532
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5533
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5534 5535 5536
		return 0;
	return 1;
}
5537

T
Theodore Ts'o 已提交
5538 5539 5540
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5541
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5542 5543 5544
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5545
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5546

5547 5548 5549
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];

5550
static int __init ext4_init_fs(void)
5551
{
5552
	int i, err;
5553

5554
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5555 5556 5557
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5558
	/* Build-time check for flags consistency */
5559
	ext4_check_flag_values();
5560

5561
	for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5562 5563
		init_waitqueue_head(&ext4__ioend_wq[i]);

5564
	err = ext4_init_es();
5565 5566
	if (err)
		return err;
5567 5568 5569

	err = ext4_init_pageio();
	if (err)
5570
		goto out5;
5571

5572
	err = ext4_init_system_zone();
5573
	if (err)
5574
		goto out4;
5575

5576
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5577
	if (err)
5578
		goto out3;
5579

5580
	err = ext4_init_mballoc();
5581 5582
	if (err)
		goto out2;
5583 5584 5585
	err = init_inodecache();
	if (err)
		goto out1;
5586
	register_as_ext3();
5587
	register_as_ext2();
T
Theodore Ts'o 已提交
5588
	err = register_filesystem(&ext4_fs_type);
5589 5590
	if (err)
		goto out;
5591

5592 5593
	return 0;
out:
5594 5595
	unregister_as_ext2();
	unregister_as_ext3();
5596 5597
	destroy_inodecache();
out1:
5598
	ext4_exit_mballoc();
5599
out2:
5600 5601
	ext4_exit_sysfs();
out3:
5602
	ext4_exit_system_zone();
5603
out4:
5604
	ext4_exit_pageio();
5605
out5:
5606 5607
	ext4_exit_es();

5608 5609 5610
	return err;
}

5611
static void __exit ext4_exit_fs(void)
5612
{
5613
	ext4_destroy_lazyinit_thread();
5614 5615
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5616
	unregister_filesystem(&ext4_fs_type);
5617
	destroy_inodecache();
5618
	ext4_exit_mballoc();
5619
	ext4_exit_sysfs();
5620 5621
	ext4_exit_system_zone();
	ext4_exit_pageio();
5622
	ext4_exit_es();
5623 5624 5625
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5626
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5627
MODULE_LICENSE("GPL");
5628 5629
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)