super.c 153.4 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

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

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

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

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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
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static struct ratelimit_state ext4_mount_msg_ratelimit;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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/*
 * Lock ordering
 *
 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
 * i_mmap_rwsem (inode->i_mmap_rwsem)!
 *
 * page fault path:
 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
 *   page lock -> i_data_sem (rw)
 *
 * buffered write path:
 * sb_start_write -> i_mutex -> mmap_sem
 * sb_start_write -> i_mutex -> transaction start -> page lock ->
 *   i_data_sem (rw)
 *
 * truncate:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   i_mmap_rwsem (w) -> page lock
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   transaction start -> i_data_sem (rw)
 *
 * direct IO:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
 *   transaction start -> i_data_sem (rw)
 *
 * writepages:
 * transaction start -> page lock(s) -> i_data_sem (rw)
 */

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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
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static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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static __le32 ext4_superblock_csum(struct super_block *sb,
				   struct ext4_super_block *es)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int offset = offsetof(struct ext4_super_block, s_checksum);
	__u32 csum;

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

	return cpu_to_le32(csum);
}

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

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

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

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	if (!ext4_has_metadata_csum(sb))
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		return;

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

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

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

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

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

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

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

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

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

__u32 ext4_free_inodes_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_inodes_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
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}

__u32 ext4_used_dirs_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_used_dirs_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
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		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
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}

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

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

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

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

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void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
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{
	bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}

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

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

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

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static void __save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
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	if (bdev_read_only(sb->s_bdev))
		return;
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	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
	es->s_last_error_time = cpu_to_le32(get_seconds());
	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
	es->s_last_error_line = cpu_to_le32(line);
	if (!es->s_first_error_time) {
		es->s_first_error_time = es->s_last_error_time;
		strncpy(es->s_first_error_func, func,
			sizeof(es->s_first_error_func));
		es->s_first_error_line = cpu_to_le32(line);
		es->s_first_error_ino = es->s_last_error_ino;
		es->s_first_error_block = es->s_last_error_block;
	}
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	/*
	 * Start the daily error reporting function if it hasn't been
	 * started already
	 */
	if (!es->s_error_count)
		mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
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	le32_add_cpu(&es->s_error_count, 1);
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}

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

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

	return bdi->dev == NULL;
}

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static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
{
	struct super_block		*sb = journal->j_private;
	struct ext4_sb_info		*sbi = EXT4_SB(sb);
	int				error = is_journal_aborted(journal);
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	struct ext4_journal_cb_entry	*jce;
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	BUG_ON(txn->t_state == T_FINISHED);
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	spin_lock(&sbi->s_md_lock);
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	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
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		list_del_init(&jce->jce_list);
		spin_unlock(&sbi->s_md_lock);
		jce->jce_func(sb, jce, error);
		spin_lock(&sbi->s_md_lock);
	}
	spin_unlock(&sbi->s_md_lock);
}
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/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
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 * superblock.  That is not possible on ext4, because we may have other
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 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
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 * We'll just use the jbd2_journal_abort() error code to record an error in
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 * the journal instead.  On recovery, the journal will complain about
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 * that error until we've noted it down and cleared it.
 */

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

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

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

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

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	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);
		va_end(args);
	}
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	save_error_info(sb, function, line);
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	ext4_handle_error(sb);
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}

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void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
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{
	va_list args;
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	struct va_format vaf;
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	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
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	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
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	if (ext4_error_ratelimit(inode->i_sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: block %llu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, &vaf);
		else
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, &vaf);
		va_end(args);
	}
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	save_error_info(inode->i_sb, function, line);
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	ext4_handle_error(inode->i_sb);
}

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

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	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
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	if (ext4_error_ratelimit(inode->i_sb)) {
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		path = file_path(file, pathname, sizeof(pathname));
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		if (IS_ERR(path))
			path = "(unknown)";
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "block %llu: comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, path, &vaf);
		else
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, path, &vaf);
		va_end(args);
	}
515
	save_error_info(inode->i_sb, function, line);
516 517 518
	ext4_handle_error(inode->i_sb);
}

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

	switch (errno) {
525 526 527 528 529 530
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
531 532 533 534 535 536 537
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
538 539
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

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

562 563
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
564 565 566 567 568 569 570 571 572 573 574
{
	char nbuf[16];
	const char *errstr;

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

575 576 577 578 579
	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}
580

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

/*
586
 * ext4_abort is a much stronger failure handler than ext4_error.  The
587 588 589 590 591 592 593 594
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

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

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

608 609 610
	if ((sb->s_flags & MS_RDONLY) == 0) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
611 612 613 614 615 616
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
617 618 619 620
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
621 622 623 624
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
625
		panic("EXT4-fs panic from previous error\n");
626
	}
627 628
}

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

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

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

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

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

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

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

666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
void __ext4_warning_inode(const struct inode *inode, const char *function,
			  unsigned int line, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

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

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
	       "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
	       function, line, inode->i_ino, current->comm, &vaf);
	va_end(args);
}

684 685 686 687
void __ext4_grp_locked_error(const char *function, unsigned int line,
			     struct super_block *sb, ext4_group_t grp,
			     unsigned long ino, ext4_fsblk_t block,
			     const char *fmt, ...)
688 689 690
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
691
	struct va_format vaf;
692 693 694
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

695 696 697
	es->s_last_error_ino = cpu_to_le32(ino);
	es->s_last_error_block = cpu_to_le64(block);
	__save_error_info(sb, function, line);
J
Joe Perches 已提交
698

699 700 701 702 703 704 705 706 707 708 709 710 711 712
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
		       sb->s_id, function, line, grp);
		if (ino)
			printk(KERN_CONT "inode %lu: ", ino);
		if (block)
			printk(KERN_CONT "block %llu:",
			       (unsigned long long) block);
		printk(KERN_CONT "%pV\n", &vaf);
		va_end(args);
	}
713 714

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

719 720 721 722 723 724 725 726
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
L
Lucas De Marchi 已提交
727
	 * ext4_grp_locked_error() to distinguish between the
728 729 730 731 732 733 734 735
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

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

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

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

748 749 750
	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
751 752 753 754 755 756 757 758 759 760 761 762 763
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

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

/*
 * Open the external journal device
 */
764
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
765 766 767 768
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

876
	sync_blockdev(sb->s_bdev);
877
	invalidate_bdev(sb->s_bdev);
878 879 880 881 882 883 884
	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);
885
		invalidate_bdev(sbi->journal_bdev);
886
		ext4_blkdev_remove(sbi);
887
	}
888 889 890 891
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
892 893
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
894
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
895 896 897 898 899 900
	/*
	 * 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);
901 902
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
903
	kfree(sbi->s_blockgroup_lock);
904 905 906
	kfree(sbi);
}

907
static struct kmem_cache *ext4_inode_cachep;
908 909 910 911

/*
 * Called inside transaction, so use GFP_NOFS
 */
912
static struct inode *ext4_alloc_inode(struct super_block *sb)
913
{
914
	struct ext4_inode_info *ei;
915

C
Christoph Lameter 已提交
916
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
917 918
	if (!ei)
		return NULL;
919

920
	ei->vfs_inode.i_version = 1;
921
	spin_lock_init(&ei->i_raw_lock);
922 923
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
924 925
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
926
	INIT_LIST_HEAD(&ei->i_es_list);
927
	ei->i_es_all_nr = 0;
928
	ei->i_es_shk_nr = 0;
929
	ei->i_es_shrink_lblk = 0;
930 931 932
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
933
	ei->i_da_metadata_calc_len = 0;
934
	ei->i_da_metadata_calc_last_lblock = 0;
935
	spin_lock_init(&(ei->i_block_reservation_lock));
936 937
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
938
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
939
#endif
940
	ei->jinode = NULL;
941
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
942
	spin_lock_init(&ei->i_completed_io_lock);
943 944
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
945
	atomic_set(&ei->i_unwritten, 0);
946
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
947
#ifdef CONFIG_EXT4_FS_ENCRYPTION
948
	ei->i_crypt_info = NULL;
949
#endif
950 951 952
	return &ei->vfs_inode;
}

953 954 955 956 957 958 959 960
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
961 962 963 964 965 966
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));
}

967
static void ext4_destroy_inode(struct inode *inode)
968
{
969
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
970 971 972
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
973 974 975 976 977
		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
978
	call_rcu(&inode->i_rcu, ext4_i_callback);
979 980
}

981
static void init_once(void *foo)
982
{
983
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
984

C
Christoph Lameter 已提交
985 986
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
987
	init_rwsem(&ei->i_data_sem);
988
	init_rwsem(&ei->i_mmap_sem);
C
Christoph Lameter 已提交
989
	inode_init_once(&ei->vfs_inode);
990 991
}

992
static int __init init_inodecache(void)
993
{
994 995
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
996
					     0, (SLAB_RECLAIM_ACCOUNT|
997
						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
998
					     init_once);
999
	if (ext4_inode_cachep == NULL)
1000 1001 1002 1003 1004 1005
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
1006 1007 1008 1009 1010
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
1011
	kmem_cache_destroy(ext4_inode_cachep);
1012 1013
}

A
Al Viro 已提交
1014
void ext4_clear_inode(struct inode *inode)
1015
{
A
Al Viro 已提交
1016
	invalidate_inode_buffers(inode);
1017
	clear_inode(inode);
1018
	dquot_drop(inode);
1019
	ext4_discard_preallocations(inode);
1020
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1021 1022 1023 1024 1025 1026
	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;
	}
1027 1028
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	if (EXT4_I(inode)->i_crypt_info)
1029
		ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
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
#ifdef CONFIG_QUOTA
L
Li Xi 已提交
1097 1098
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
1099

1100 1101 1102 1103 1104
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);
1105
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1106
			 struct path *path);
1107
static int ext4_quota_off(struct super_block *sb, int type);
1108 1109
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,
1110
			       size_t len, loff_t off);
1111
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1112
				const char *data, size_t len, loff_t off);
1113 1114 1115
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);
1116

J
Jan Kara 已提交
1117 1118 1119 1120 1121
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1122
static const struct dquot_operations ext4_quota_operations = {
1123
	.get_reserved_space = ext4_get_reserved_space,
1124 1125 1126 1127
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1128 1129 1130
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
L
Li Xi 已提交
1131
	.get_projid	= ext4_get_projid,
1132
	.get_next_id	= dquot_get_next_id,
1133 1134
};

1135
static const struct quotactl_ops ext4_qctl_operations = {
1136
	.quota_on	= ext4_quota_on,
1137
	.quota_off	= ext4_quota_off,
1138
	.quota_sync	= dquot_quota_sync,
1139
	.get_state	= dquot_get_state,
1140 1141
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
1142 1143
	.set_dqblk	= dquot_set_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
1144 1145 1146
};
#endif

1147
static const struct super_operations ext4_sops = {
1148 1149 1150 1151
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1152
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1153
	.evict_inode	= ext4_evict_inode,
1154 1155
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1156 1157
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1158 1159 1160
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1161
#ifdef CONFIG_QUOTA
1162 1163
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1164
	.get_dquots	= ext4_get_dquots,
1165
#endif
1166
	.bdev_try_to_free_page = bdev_try_to_free_page,
1167 1168
};

1169
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1170 1171
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1172
	.get_parent = ext4_get_parent,
1173 1174 1175 1176 1177
};

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,
1178
	Opt_nouid32, Opt_debug, Opt_removed,
1179
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1180
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1181 1182
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1183
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1184
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1185
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1186
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1187
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
R
Ross Zwisler 已提交
1188
	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1189
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1190
	Opt_lazytime, Opt_nolazytime,
1191
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1192
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1193
	Opt_dioread_nolock, Opt_dioread_lock,
1194
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1195
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1196 1197
};

1198
static const match_table_t tokens = {
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
	{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"},
1213 1214
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1215 1216 1217 1218
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1219
	{Opt_noload, "norecovery"},
1220
	{Opt_noload, "noload"},
1221 1222
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1223
	{Opt_commit, "commit=%u"},
1224 1225
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1226
	{Opt_journal_dev, "journal_dev=%u"},
1227
	{Opt_journal_path, "journal_path=%s"},
1228
	{Opt_journal_checksum, "journal_checksum"},
1229
	{Opt_nojournal_checksum, "nojournal_checksum"},
1230
	{Opt_journal_async_commit, "journal_async_commit"},
1231 1232 1233 1234
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1235 1236
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1237 1238 1239 1240 1241 1242
	{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
1243
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1244 1245 1246 1247 1248
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1249 1250
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1251
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1252
	{Opt_dax, "dax"},
1253
	{Opt_stripe, "stripe=%u"},
1254
	{Opt_delalloc, "delalloc"},
1255 1256
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1257
	{Opt_nodelalloc, "nodelalloc"},
1258 1259
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1260 1261
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1262
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1263
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1264
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1265 1266
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1267 1268
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1269 1270
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1271 1272 1273
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1274
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1275
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1276 1277 1278 1279 1280
	{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
1281
	{Opt_err, NULL},
1282 1283
};

1284
static ext4_fsblk_t get_sb_block(void **data)
1285
{
1286
	ext4_fsblk_t	sb_block;
1287 1288 1289 1290
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1291

1292
	options += 3;
1293
	/* TODO: use simple_strtoll with >32bit ext4 */
1294 1295
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1296
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1297 1298 1299 1300 1301 1302
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1303

1304 1305 1306
	return sb_block;
}

1307
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1308 1309
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";
1310

D
Dmitry Monakhov 已提交
1311 1312 1313 1314 1315
#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;
1316
	int ret = -1;
D
Dmitry Monakhov 已提交
1317 1318 1319 1320 1321 1322

	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");
1323
		return -1;
D
Dmitry Monakhov 已提交
1324
	}
1325
	if (ext4_has_feature_quota(sb)) {
1326 1327 1328 1329
		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
			 "when QUOTA feature is enabled");
		return -1;
	}
D
Dmitry Monakhov 已提交
1330 1331 1332 1333
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1334
		return -1;
D
Dmitry Monakhov 已提交
1335
	}
1336 1337 1338 1339 1340 1341 1342 1343
	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
1344
	}
1345
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1346 1347
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1348
		goto errout;
D
Dmitry Monakhov 已提交
1349
	}
1350
	sbi->s_qf_names[qtype] = qname;
1351
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1352
	return 1;
1353 1354 1355
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366
}

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");
1367
		return -1;
D
Dmitry Monakhov 已提交
1368
	}
1369
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1370 1371 1372 1373 1374
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1375 1376 1377 1378 1379 1380
#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
1381
#ifdef CONFIG_QUOTA
1382 1383 1384 1385 1386
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1387
#endif
1388
#define MOPT_DATAJ	0x0080
1389 1390 1391
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1392
#define MOPT_STRING	0x0400
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404

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},
1405 1406 1407 1408
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1409 1410
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1411 1412 1413
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1414
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1415 1416
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1417
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1418
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1419
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1420
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1421
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1422
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1423 1424 1425
	{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},
1426
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1427
	 MOPT_NO_EXT2},
1428
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1429
	 MOPT_NO_EXT2},
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
	{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
1440
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1441
	{Opt_stripe, 0, MOPT_GTE0},
1442 1443
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1444 1445 1446
	{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},
1447 1448 1449 1450
	{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},
1451 1452
	{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
1453
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1454 1455
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1456
#else
1457 1458
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1459
#endif
1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
	{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
	{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
	{Opt_usrjquota, 0, MOPT_Q},
	{Opt_grpjquota, 0, MOPT_Q},
	{Opt_offusrjquota, 0, MOPT_Q},
	{Opt_offgrpjquota, 0, MOPT_Q},
	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1476
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1477
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1478 1479 1480 1481 1482 1483 1484 1485 1486
	{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;
1487 1488
	kuid_t uid;
	kgid_t gid;
1489 1490
	int arg = 0;

1491 1492 1493 1494 1495 1496 1497 1498 1499 1500
#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
1501
	switch (token) {
1502 1503 1504 1505
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1506 1507 1508
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1509
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1510 1511 1512 1513 1514 1515 1516
		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;
1517 1518 1519 1520 1521 1522
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1523 1524
	}

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
	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;
	}

1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
	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;
	}

1546
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1547 1548 1549
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1550 1551 1552
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1553 1554
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1555 1556 1557
		} else
			return -1;
	}
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
	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) {
1577 1578 1579 1580
		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");
1581
			return -1;
1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596
		}
		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);
1597 1598
			return -1;
		}
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613
		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;
1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
	} 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;
		}

1640
		journal_inode = d_inode(path.dentry);
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
		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);
1652 1653 1654 1655 1656 1657 1658 1659
	} 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);
1660 1661 1662 1663 1664 1665 1666 1667 1668
	} 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
1669 1670 1671 1672 1673
	} 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) {
1674
				ext4_msg(sb, KERN_ERR,
1675 1676
					 "Cannot change data mode on remount");
				return -1;
1677
			}
1678
		} else {
1679 1680
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1681
		}
1682 1683 1684 1685 1686 1687 1688 1689
#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;
		}
1690
		if (ext4_has_feature_quota(sb)) {
1691 1692 1693 1694 1695
			ext4_msg(sb, KERN_ERR,
				 "Cannot set journaled quota options "
				 "when QUOTA feature is enabled");
			return -1;
		}
1696
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1697 1698
#endif
	} else if (token == Opt_dax) {
1699 1700 1701 1702 1703
#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
1704 1705
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1706
#endif
1707 1708 1709 1710
	} 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;
1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
	} 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;
1726
	}
1727
	return 1;
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
}

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.
		 */
1750
		args[0].to = args[0].from = NULL;
1751 1752 1753 1754
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1755 1756
	}
#ifdef CONFIG_QUOTA
1757
	if (ext4_has_feature_quota(sb) &&
1758 1759 1760 1761 1762
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
			 "feature is enabled");
		return 0;
	}
1763
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1764
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1765
			clear_opt(sb, USRQUOTA);
1766

1767
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1768
			clear_opt(sb, GRPQUOTA);
1769

D
Dmitry Monakhov 已提交
1770
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1771 1772
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1773 1774 1775 1776
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1777 1778
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1779 1780 1781 1782
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

		if (blocksize < PAGE_CACHE_SIZE) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1793 1794 1795 1796 1797 1798
	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;
	}
1799 1800 1801
	return 1;
}

1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
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])
1826
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1827 1828

	if (sbi->s_qf_names[GRPQUOTA])
1829
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1830 1831 1832
#endif
}

1833 1834
static const char *token2str(int token)
{
1835
	const struct match_token *t;
1836 1837 1838 1839 1840 1841 1842

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

1843 1844 1845 1846 1847
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1848 1849
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1850 1851 1852
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1853
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1854
	const struct mount_opts *m;
1855
	char sep = nodefs ? '\n' : ',';
1856

1857 1858
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1859 1860

	if (sbi->s_sb_block != 1)
1861 1862 1863 1864 1865 1866 1867
		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;
1868
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1869 1870 1871 1872 1873 1874
			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));
1875
	}
1876

1877
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1878
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1879 1880 1881
		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)) ||
1882
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1883 1884
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1885
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1886 1887
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1888
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1889
		SEQ_OPTS_PUTS("errors=continue");
1890
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1891
		SEQ_OPTS_PUTS("errors=panic");
1892
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1893
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1894
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1895
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1896
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1897
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1898
	if (sb->s_flags & MS_I_VERSION)
1899
		SEQ_OPTS_PUTS("i_version");
1900
	if (nodefs || sbi->s_stripe)
1901
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1902
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1903 1904 1905 1906 1907 1908 1909
		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");
	}
1910 1911
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1912 1913
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1914

1915 1916
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1917
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1918 1919
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1920 1921
	if (test_opt(sb, DATA_ERR_ABORT))
		SEQ_OPTS_PUTS("data_err=abort");
1922 1923 1924 1925 1926

	ext4_show_quota_options(seq, sb);
	return 0;
}

1927 1928 1929 1930 1931
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

1932
int ext4_seq_options_show(struct seq_file *seq, void *offset)
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942
{
	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;
}

1943
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1944 1945
			    int read_only)
{
1946
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1947 1948
	int res = 0;

1949
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1950 1951
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1952 1953 1954
		res = MS_RDONLY;
	}
	if (read_only)
1955
		goto done;
1956
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1957 1958
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1959
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1960 1961 1962
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1963
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1964 1965
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1966 1967 1968
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1969 1970 1971
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1972 1973 1974
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1975
	if (!sbi->s_journal)
1976
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1977
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1978
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1979
	le16_add_cpu(&es->s_mnt_count, 1);
1980
	es->s_mtime = cpu_to_le32(get_seconds());
1981
	ext4_update_dynamic_rev(sb);
1982
	if (sbi->s_journal)
1983
		ext4_set_feature_journal_needs_recovery(sb);
1984

1985
	ext4_commit_super(sb, 1);
1986
done:
1987
	if (test_opt(sb, DEBUG))
1988
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1989
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1990 1991
			sb->s_blocksize,
			sbi->s_groups_count,
1992 1993
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1994
			sbi->s_mount_opt, sbi->s_mount_opt2);
1995

D
Dan Magenheimer 已提交
1996
	cleancache_init_fs(sb);
1997 1998 1999
	return res;
}

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024
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
2025
		kvfree(sbi->s_flex_groups);
2026 2027 2028 2029 2030 2031
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

2032 2033 2034 2035 2036
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;
2037
	int i, err;
2038

2039
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2040
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2041 2042 2043 2044
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2045 2046
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2047
		goto failed;
2048 2049

	for (i = 0; i < sbi->s_groups_count; i++) {
2050
		gdp = ext4_get_group_desc(sb, i, NULL);
2051 2052

		flex_group = ext4_flex_group(sbi, i);
2053 2054
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2055 2056
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2057 2058
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2059 2060 2061 2062 2063 2064 2065
	}

	return 1;
failed:
	return 0;
}

2066
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2067
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2068
{
2069
	int offset;
A
Andreas Dilger 已提交
2070
	__u16 crc = 0;
2071
	__le32 le_group = cpu_to_le32(block_group);
2072
	struct ext4_sb_info *sbi = EXT4_SB(sb);
A
Andreas Dilger 已提交
2073

2074
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2075
		/* Use new metadata_csum algorithm */
2076
		__le16 save_csum;
2077 2078
		__u32 csum32;

2079
		save_csum = gdp->bg_checksum;
2080 2081 2082 2083 2084
		gdp->bg_checksum = 0;
		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
				     sbi->s_desc_size);
2085
		gdp->bg_checksum = save_csum;
2086 2087 2088

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2089 2090
	}

2091
	/* old crc16 code */
2092
	if (!ext4_has_feature_gdt_csum(sb))
2093 2094
		return 0;

2095 2096 2097 2098 2099 2100 2101
	offset = offsetof(struct ext4_group_desc, bg_checksum);

	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
	crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
	crc = crc16(crc, (__u8 *)gdp, offset);
	offset += sizeof(gdp->bg_checksum); /* skip checksum */
	/* for checksum of struct ext4_group_desc do the rest...*/
2102
	if (ext4_has_feature_64bit(sb) &&
2103 2104 2105 2106 2107 2108
	    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
2109 2110 2111
	return cpu_to_le16(crc);
}

2112
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2113 2114
				struct ext4_group_desc *gdp)
{
2115
	if (ext4_has_group_desc_csum(sb) &&
2116
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
A
Andreas Dilger 已提交
2117 2118 2119 2120 2121
		return 0;

	return 1;
}

2122 2123 2124 2125 2126
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;
2127
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2128 2129
}

2130
/* Called at mount-time, super-block is locked */
2131 2132
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2133
{
2134 2135 2136
	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
2137 2138 2139
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2140
	int flexbg_flag = 0;
2141
	ext4_group_t i, grp = sbi->s_groups_count;
2142

2143
	if (ext4_has_feature_flex_bg(sb))
J
Jose R. Santos 已提交
2144 2145
		flexbg_flag = 1;

2146
	ext4_debug("Checking group descriptors");
2147

2148 2149 2150
	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
2151
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2152
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2153 2154
		else
			last_block = first_block +
2155
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2156

2157 2158 2159 2160
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2161
		block_bitmap = ext4_block_bitmap(sb, gdp);
2162
		if (block_bitmap < first_block || block_bitmap > last_block) {
2163
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2164
			       "Block bitmap for group %u not in group "
2165
			       "(block %llu)!", i, block_bitmap);
2166 2167
			return 0;
		}
2168
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2169
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2170
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2171
			       "Inode bitmap for group %u not in group "
2172
			       "(block %llu)!", i, inode_bitmap);
2173 2174
			return 0;
		}
2175
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2176
		if (inode_table < first_block ||
2177
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2178
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2179
			       "Inode table for group %u not in group "
2180
			       "(block %llu)!", i, inode_table);
2181 2182
			return 0;
		}
2183
		ext4_lock_group(sb, i);
2184
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2185 2186
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2187
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2188
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2189
			if (!(sb->s_flags & MS_RDONLY)) {
2190
				ext4_unlock_group(sb, i);
2191
				return 0;
2192
			}
A
Andreas Dilger 已提交
2193
		}
2194
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2195 2196
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2197
	}
2198 2199
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2200 2201 2202
	return 1;
}

2203
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
 * 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
2216
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2217 2218 2219
 * 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.
 */
2220 2221
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2233
	if (bdev_read_only(sb->s_bdev)) {
2234 2235
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2236 2237 2238
		return;
	}

2239 2240 2241 2242 2243 2244 2245
	/* 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;
	}

2246
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2247 2248
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2249
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2250
				  "clearing orphan list.\n");
2251 2252
			es->s_last_orphan = 0;
		}
2253 2254 2255 2256 2257
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2258
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2259 2260 2261 2262 2263 2264
		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
2265
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2266 2267
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2268
			if (ret < 0)
2269 2270 2271
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2272 2273 2274 2275 2276 2277 2278
		}
	}
#endif

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

2279 2280
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2281 2282 2283 2284
			es->s_last_orphan = 0;
			break;
		}

2285
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2286
		dquot_initialize(inode);
2287
		if (inode->i_nlink) {
2288 2289 2290 2291
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2292
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2293
				  inode->i_ino, inode->i_size);
A
Al Viro 已提交
2294
			inode_lock(inode);
2295
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2296
			ext4_truncate(inode);
A
Al Viro 已提交
2297
			inode_unlock(inode);
2298 2299
			nr_truncates++;
		} else {
2300 2301 2302 2303
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2304 2305 2306 2307 2308 2309 2310
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2311
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2312 2313

	if (nr_orphans)
2314 2315
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2316
	if (nr_truncates)
2317 2318
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2319 2320
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2321
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2322
		if (sb_dqopt(sb)->files[i])
2323
			dquot_quota_off(sb, i);
2324 2325 2326 2327
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2328

2329 2330 2331 2332 2333 2334 2335
/*
 * 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.
 *
2336 2337 2338 2339 2340 2341
 * 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.
 *
2342 2343
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2344
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2345 2346 2347 2348 2349
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2350
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2351
		/*
2352
		 * CONFIG_LBDAF is not enabled implies the inode
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362
		 * 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;
	}

2363 2364 2365 2366 2367 2368
	/*
	 * 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;
2369 2370 2371 2372 2373 2374 2375 2376
	res <<= blkbits;

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

	return res;
}
2377 2378

/*
2379
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2380 2381
 * 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.
2382
 */
2383
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2384
{
2385
	loff_t res = EXT4_NDIR_BLOCKS;
2386 2387
	int meta_blocks;
	loff_t upper_limit;
2388 2389 2390 2391 2392 2393
	/* 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.
2394 2395
	 */

2396
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2397
		/*
2398
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2399 2400
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2401 2402 2403 2404 2405 2406 2407
		 */
		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
2408 2409 2410 2411 2412 2413
		/*
		 * 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
		 */
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
		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;
2427 2428 2429 2430 2431 2432 2433

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2434 2435 2436 2437

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2438 2439 2440
	return res;
}

2441
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2442
				   ext4_fsblk_t logical_sb_block, int nr)
2443
{
2444
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2445
	ext4_group_t bg, first_meta_bg;
2446 2447 2448 2449
	int has_super = 0;

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

2450
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2451
		return logical_sb_block + nr + 1;
2452
	bg = sbi->s_desc_per_block * nr;
2453
	if (ext4_bg_has_super(sb, bg))
2454
		has_super = 1;
2455

2456 2457 2458 2459 2460 2461 2462 2463 2464 2465
	/*
	 * 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++;

2466
	return (has_super + ext4_group_first_block_no(sb, bg));
2467 2468
}

2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484
/**
 * 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
2485
	int ret;
2486 2487

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2488 2489 2490 2491 2492 2493 2494
		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;
2495

D
Dan Ehrenberg 已提交
2496 2497 2498 2499 2500 2501
	/*
	 * 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;
2502

D
Dan Ehrenberg 已提交
2503
	return ret;
2504
}
2505

2506 2507 2508 2509 2510 2511 2512 2513
/*
 * 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)
{
2514
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525
		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;

2526
	if (ext4_has_feature_readonly(sb)) {
D
Darrick J. Wong 已提交
2527 2528 2529 2530 2531
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2532
	/* Check that feature set is OK for a read-write mount */
2533
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
		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
	 */
2544
	if (ext4_has_feature_huge_file(sb)) {
2545 2546 2547 2548 2549 2550 2551
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2552
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2553 2554 2555 2556 2557
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2558 2559

#ifndef CONFIG_QUOTA
2560
	if (ext4_has_feature_quota(sb) && !readonly) {
2561 2562 2563 2564 2565
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
L
Li Xi 已提交
2566 2567 2568 2569 2570 2571
	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;
	}
2572
#endif  /* CONFIG_QUOTA */
2573 2574 2575
	return 1;
}

2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589
/*
 * 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)
2590 2591
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2592 2593
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2594
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
2608
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635
/* 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;

2636
	sb_start_write(sb);
2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647
	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;
	}

2648
	if (group >= ngroups)
2649 2650 2651 2652 2653 2654 2655
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2656 2657
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2658 2659 2660 2661 2662
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2663
	sb_end_write(sb);
2664 2665 2666 2667 2668 2669

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2670
 * request structure. Should be called with li_list_mtx held
2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687
 */
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)
{
2688 2689 2690
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2691
		return;
2692
	}
2693 2694

	mutex_lock(&ext4_li_info->li_list_mtx);
2695
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2696
	mutex_unlock(&ext4_li_info->li_list_mtx);
2697
	mutex_unlock(&ext4_li_mtx);
2698 2699
}

2700 2701
static struct task_struct *ext4_lazyinit_task;

2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715
/*
 * 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;
2716
	unsigned long next_wakeup, cur;
2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733

	BUG_ON(NULL == eli);

cont_thread:
	while (true) {
		next_wakeup = MAX_JIFFY_OFFSET;

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

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

2734 2735 2736 2737 2738 2739
			if (time_after_eq(jiffies, elr->lr_next_sched)) {
				if (ext4_run_li_request(elr) != 0) {
					/* error, remove the lazy_init job */
					ext4_remove_li_request(elr);
					continue;
				}
2740 2741 2742 2743 2744 2745 2746
			}

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

2747
		try_to_freeze();
2748

2749 2750
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2751
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2752 2753 2754 2755
			cond_resched();
			continue;
		}

2756 2757
		schedule_timeout_interruptible(next_wakeup - cur);

2758 2759 2760 2761
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803
	}

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)
{
2804 2805 2806 2807
	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);
2808 2809 2810
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2811
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879
				 "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.
	 */
2880 2881
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
2882 2883 2884
	return elr;
}

2885 2886
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
2887 2888
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2889
	struct ext4_li_request *elr = NULL;
2890
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2891
	int ret = 0;
2892

2893
	mutex_lock(&ext4_li_mtx);
2894 2895 2896 2897 2898 2899
	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;
2900
		goto out;
2901
	}
2902 2903 2904

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
2905
	    !test_opt(sb, INIT_INODE_TABLE))
2906
		goto out;
2907 2908

	elr = ext4_li_request_new(sb, first_not_zeroed);
2909 2910 2911 2912
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924

	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;
2925 2926 2927 2928 2929 2930
	/*
	 * 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;
2931 2932 2933 2934 2935 2936 2937

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
2938 2939
	mutex_unlock(&ext4_li_mtx);
	if (ret)
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
		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.
	 */
2954
	if (!ext4_li_info || !ext4_lazyinit_task)
2955 2956
		return;

2957
	kthread_stop(ext4_lazyinit_task);
2958 2959
}

2960 2961 2962 2963 2964 2965
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);

2966
	if (ext4_has_metadata_csum(sb)) {
2967
		/* journal checksum v3 */
2968
		compat = 0;
2969
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
2970 2971 2972 2973 2974 2975
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

2976 2977 2978 2979
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991
	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 {
2992 2993
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2994 2995 2996 2997 2998
	}

	return ret;
}

2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022
/*
 * 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;

3023
	if (!ext4_has_feature_bigalloc(sb))
3024 3025 3026
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075
	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
		(grp * EXT4_BLOCKS_PER_GROUP(sb));
	last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
	for (i = 0; i < ngroups; i++) {
		gdp = ext4_get_group_desc(sb, i, NULL);
		b = ext4_block_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_table(sb, gdp);
		if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
			for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
				int c = EXT4_B2C(sbi, b - first_block);
				ext4_set_bit(c, buf);
				count++;
			}
		if (i != grp)
			continue;
		s = 0;
		if (ext4_bg_has_super(sb, grp)) {
			ext4_set_bit(s++, buf);
			count++;
		}
		for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
			count++;
		}
	}
	if (!count)
		return 0;
	return EXT4_CLUSTERS_PER_GROUP(sb) -
		ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
}

/*
 * Compute the overhead and stash it in sbi->s_overhead
 */
int ext4_calculate_overhead(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
3076
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103

	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();
	}
3104 3105
	/* Add the internal journal blocks as well */
	if (sbi->s_journal && !sbi->journal_bdev)
3106
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3107

3108 3109 3110 3111 3112 3113
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3114
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3115 3116
{
	ext4_fsblk_t resv_clusters;
3117
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3118

3119 3120 3121 3122 3123 3124
	/*
	 * 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.
	 */
3125
	if (!ext4_has_feature_extents(sb))
3126
		return;
L
Lukas Czerner 已提交
3127 3128 3129 3130
	/*
	 * 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
3131
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3132 3133 3134
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3135 3136
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3137 3138 3139 3140

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

3141
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3142 3143
}

3144
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3145
{
3146
	char *orig_data = kstrdup(data, GFP_KERNEL);
3147
	struct buffer_head *bh;
3148 3149 3150 3151
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3152
	ext4_fsblk_t logical_sb_block;
3153 3154 3155 3156
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3157
	const char *descr;
3158
	int ret = -ENOMEM;
3159
	int blocksize, clustersize;
3160 3161
	unsigned int db_count;
	unsigned int i;
3162
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3163
	__u64 blocks_count;
3164
	int err = 0;
3165
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3166
	ext4_group_t first_not_zeroed;
3167 3168 3169

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3170
		goto out_free_orig;
3171 3172 3173 3174 3175

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3176
		goto out_free_orig;
3177
	}
3178
	sb->s_fs_info = sbi;
3179
	sbi->s_sb = sb;
3180
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3181
	sbi->s_sb_block = sb_block;
3182 3183 3184
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3185

3186
	/* Cleanup superblock name */
3187
	strreplace(sb->s_id, '/', '!');
3188

3189
	/* -EINVAL is default */
3190
	ret = -EINVAL;
3191
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3192
	if (!blocksize) {
3193
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3194 3195 3196 3197
		goto out_fail;
	}

	/*
3198
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3199 3200
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3201
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3202 3203
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3204
	} else {
3205
		logical_sb_block = sb_block;
3206 3207
	}

3208
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3209
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3210 3211 3212 3213
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3214
	 *       some ext4 macro-instructions depend on its value
3215
	 */
3216
	es = (struct ext4_super_block *) (bh->b_data + offset);
3217 3218
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3219 3220
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3221
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3222

3223
	/* Warn if metadata_csum and gdt_csum are both set. */
3224 3225
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3226
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3227 3228
			     "redundant flags; please run fsck.");

3229 3230 3231 3232 3233 3234 3235 3236
	/* 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;
	}

3237
	/* Load the checksum driver */
3238
	if (ext4_has_feature_metadata_csum(sb)) {
3239 3240 3241 3242 3243 3244 3245 3246 3247
		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;
		}
	}

3248 3249 3250 3251 3252
	/* 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;
3253
		ret = -EFSBADCRC;
3254 3255 3256 3257
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3258
	if (ext4_has_feature_csum_seed(sb))
3259 3260
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3261 3262 3263
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3264 3265
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3266
	set_opt(sb, INIT_INODE_TABLE);
3267
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3268
		set_opt(sb, DEBUG);
3269
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3270
		set_opt(sb, GRPID);
3271
	if (def_mount_opts & EXT4_DEFM_UID16)
3272
		set_opt(sb, NO_UID32);
3273 3274
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3275
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3276
	set_opt(sb, POSIX_ACL);
3277
#endif
3278 3279 3280 3281
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3282
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3283
		set_opt(sb, JOURNAL_DATA);
3284
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3285
		set_opt(sb, ORDERED_DATA);
3286
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3287
		set_opt(sb, WRITEBACK_DATA);
3288 3289

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3290
		set_opt(sb, ERRORS_PANIC);
3291
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3292
		set_opt(sb, ERRORS_CONT);
3293
	else
3294
		set_opt(sb, ERRORS_RO);
3295 3296
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3297
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3298
		set_opt(sb, DISCARD);
3299

3300 3301
	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));
3302 3303 3304
	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;
3305

3306
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3307
		set_opt(sb, BARRIER);
3308

3309 3310 3311 3312
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3313
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3314
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3315
		set_opt(sb, DELALLOC);
3316

3317 3318 3319 3320 3321 3322
	/*
	 * 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;

3323
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3324
			   &journal_devnum, &journal_ioprio, 0)) {
3325 3326 3327 3328
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3329
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3330
	if (!parse_options((char *) data, sb, &journal_devnum,
3331
			   &journal_ioprio, 0))
3332 3333
		goto failed_mount;

3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344
	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 "
3345
				 "both data=journal and dioread_nolock");
3346 3347
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3348 3349 3350 3351 3352
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3353 3354
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3355 3356
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3357 3358
	}

3359
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3360
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3361

3362
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3363 3364 3365
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3366 3367 3368
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3369

3370 3371
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3372
		if (ext4_has_feature_64bit(sb)) {
3373 3374 3375 3376 3377 3378
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400
	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;
		}
	}

3401 3402 3403 3404 3405
	/*
	 * 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.
	 */
3406
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3407
		goto failed_mount;
3408

J
Jan Kara 已提交
3409
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3410 3411
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3412 3413
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3414 3415 3416
		goto failed_mount;
	}

R
Ross Zwisler 已提交
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
		if (blocksize != PAGE_SIZE) {
			ext4_msg(sb, KERN_ERR,
					"error: unsupported blocksize for dax");
			goto failed_mount;
		}
		if (!sb->s_bdev->bd_disk->fops->direct_access) {
			ext4_msg(sb, KERN_ERR,
					"error: device does not support dax");
			goto failed_mount;
		}
	}

3430
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3431 3432 3433 3434 3435
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3436
	if (sb->s_blocksize != blocksize) {
3437 3438
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3439
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3440
					blocksize);
3441 3442 3443
			goto failed_mount;
		}

3444
		brelse(bh);
3445 3446
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3447
		bh = sb_bread_unmovable(sb, logical_sb_block);
3448
		if (!bh) {
3449 3450
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3451 3452
			goto failed_mount;
		}
3453
		es = (struct ext4_super_block *)(bh->b_data + offset);
3454
		sbi->s_es = es;
3455
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3456 3457
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3458 3459 3460 3461
			goto failed_mount;
		}
	}

3462
	has_huge_files = ext4_has_feature_huge_file(sb);
3463 3464 3465
	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);
3466

3467 3468 3469
	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;
3470 3471 3472
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3473
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3474
		    (!is_power_of_2(sbi->s_inode_size)) ||
3475
		    (sbi->s_inode_size > blocksize)) {
3476 3477
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3478
			       sbi->s_inode_size);
3479 3480
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3481 3482
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3483
	}
3484

3485
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3486
	if (ext4_has_feature_64bit(sb)) {
3487
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3488
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3489
		    !is_power_of_2(sbi->s_desc_size)) {
3490 3491
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3492 3493 3494 3495 3496
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3497

3498 3499
	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);
3500
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3501
		goto cantfind_ext4;
3502

3503
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3504
	if (sbi->s_inodes_per_block == 0)
3505
		goto cantfind_ext4;
3506 3507
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3508
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3509 3510
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3511 3512
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3513

3514
	for (i = 0; i < 4; i++)
3515 3516
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3517
	if (ext4_has_feature_dir_index(sb)) {
3518 3519 3520 3521
		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) {
3522
#ifdef __CHAR_UNSIGNED__
3523 3524 3525 3526
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3527
#else
3528 3529 3530
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3531
#endif
3532
		}
3533
	}
3534

3535 3536
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3537
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577
	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;
3578
	}
3579 3580
	sbi->s_cluster_ratio = clustersize / blocksize;

3581
	if (sbi->s_inodes_per_group > blocksize * 8) {
3582 3583
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3584
		       sbi->s_inodes_per_group);
3585 3586 3587
		goto failed_mount;
	}

3588 3589 3590 3591
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3592 3593 3594 3595
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3596
	err = generic_check_addressable(sb->s_blocksize_bits,
3597
					ext4_blocks_count(es));
3598
	if (err) {
3599
		ext4_msg(sb, KERN_ERR, "filesystem"
3600
			 " too large to mount safely on this system");
3601
		if (sizeof(sector_t) < 8)
3602
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3603 3604 3605
		goto failed_mount;
	}

3606 3607
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3608

3609 3610 3611
	/* 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) {
3612 3613
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3614 3615 3616 3617
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3618 3619 3620 3621 3622
	/*
	 * 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)) {
3623
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3624 3625 3626
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3627 3628
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3629 3630 3631 3632
	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));
3633
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3634
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3635
		       "(block count %llu, first data block %u, "
3636
		       "blocks per group %lu)", sbi->s_groups_count,
3637 3638 3639 3640 3641
		       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
3642
	sbi->s_groups_count = blocks_count;
3643 3644
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3645 3646
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3647 3648 3649
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3650
	if (sbi->s_group_desc == NULL) {
3651
		ext4_msg(sb, KERN_ERR, "not enough memory");
3652
		ret = -ENOMEM;
3653 3654 3655
		goto failed_mount;
	}

3656
	bgl_lock_init(sbi->s_blockgroup_lock);
3657 3658

	for (i = 0; i < db_count; i++) {
3659
		block = descriptor_loc(sb, logical_sb_block, i);
3660
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3661
		if (!sbi->s_group_desc[i]) {
3662 3663
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3664 3665 3666 3667
			db_count = i;
			goto failed_mount2;
		}
	}
3668
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3669
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3670
		ret = -EFSCORRUPTED;
3671
		goto failed_mount2;
3672
	}
3673

3674
	sbi->s_gdb_count = db_count;
3675 3676 3677
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3678 3679
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3680

3681
	/* Register extent status tree shrinker */
3682
	if (ext4_es_register_shrinker(sbi))
3683 3684
		goto failed_mount3;

3685
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3686
	sbi->s_extent_max_zeroout_kb = 32;
3687

3688 3689 3690
	/*
	 * set up enough so that it can read an inode
	 */
3691
	sb->s_op = &ext4_sops;
3692 3693
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3694
#ifdef CONFIG_QUOTA
3695
	sb->dq_op = &ext4_quota_operations;
3696
	if (ext4_has_feature_quota(sb))
3697
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3698 3699
	else
		sb->s_qcop = &ext4_qctl_operations;
L
Li Xi 已提交
3700
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3701
#endif
3702 3703
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3704
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3705
	mutex_init(&sbi->s_orphan_lock);
3706 3707 3708 3709

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3710
			  ext4_has_feature_journal_needs_recovery(sb));
3711

3712
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3713
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3714
			goto failed_mount3a;
3715

3716 3717 3718 3719
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3720
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3721
		if (ext4_load_journal(sb, es, journal_devnum))
3722
			goto failed_mount3a;
3723
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3724
		   ext4_has_feature_journal_needs_recovery(sb)) {
3725 3726
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3727
		goto failed_mount_wq;
3728
	} else {
3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753
		/* 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);
3754
		clear_opt(sb, DATA_FLAGS);
3755 3756 3757
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3758 3759
	}

3760
	if (ext4_has_feature_64bit(sb) &&
3761 3762
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3763
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3764
		goto failed_mount_wq;
3765 3766
	}

3767 3768 3769 3770
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3771
	}
3772

3773 3774 3775 3776 3777
	/* 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
3778 3779 3780
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3781 3782
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3783
			set_opt(sb, ORDERED_DATA);
3784
		else
3785
			set_opt(sb, JOURNAL_DATA);
3786 3787
		break;

3788 3789
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3790 3791
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3792 3793
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3794
			goto failed_mount_wq;
3795 3796 3797 3798
		}
	default:
		break;
	}
3799
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3800

B
Bobi Jam 已提交
3801 3802
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3803
no_journal:
3804 3805 3806 3807
	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;
3808 3809
	}

3810
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
3811 3812 3813 3814 3815 3816
	    (blocksize != PAGE_CACHE_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

3817 3818 3819
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
3820 3821 3822
		ext4_commit_super(sb, 1);
	}

3823 3824 3825 3826 3827 3828 3829
	/*
	 * 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 {
3830 3831
		err = ext4_calculate_overhead(sb);
		if (err)
3832 3833 3834
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3835 3836 3837 3838
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3839 3840 3841 3842
	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");
3843
		ret = -ENOMEM;
3844 3845 3846
		goto failed_mount4;
	}

3847
	/*
3848
	 * The jbd2_journal_load will have done any necessary log recovery,
3849 3850 3851
	 * so we can safely mount the rest of the filesystem now.
	 */

3852 3853
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3854
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3855
		ret = PTR_ERR(root);
3856
		root = NULL;
3857 3858 3859
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3860
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
3861
		iput(root);
3862 3863
		goto failed_mount4;
	}
3864
	sb->s_root = d_make_root(root);
3865
	if (!sb->s_root) {
3866
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3867 3868 3869
		ret = -ENOMEM;
		goto failed_mount4;
	}
3870

3871 3872
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
3873 3874 3875 3876 3877

	/* 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;
3878
		if (ext4_has_feature_extra_isize(sb)) {
K
Kalpak Shah 已提交
3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893
			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;
3894 3895
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
3896 3897
	}

3898
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
3899

3900 3901
	err = ext4_setup_system_zone(sb);
	if (err) {
3902
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
3903
			 "zone (%d)", err);
3904 3905 3906 3907 3908 3909 3910 3911
		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);
3912
		goto failed_mount5;
3913 3914
	}

3915 3916 3917
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
3918 3919
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
3920 3921 3922
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
3923 3924
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
3925 3926 3927
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
3928
					  ext4_count_dirs(sb), GFP_KERNEL);
3929
	if (!err)
3930 3931
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
3932 3933 3934 3935 3936
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

3937
	if (ext4_has_feature_flex_bg(sb))
3938 3939 3940 3941 3942 3943 3944
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

3945 3946
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
3947
		goto failed_mount6;
3948

3949
	err = ext4_register_sysfs(sb);
3950 3951
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
3952

3953 3954
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
3955
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
3956 3957 3958 3959 3960 3961
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

3962 3963 3964
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3965
	if (needs_recovery) {
3966
		ext4_msg(sb, KERN_INFO, "recovery complete");
3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978
		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";

3979 3980 3981 3982 3983 3984 3985 3986
	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");
	}

3987 3988 3989 3990
	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);
3991

3992 3993
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3994

3995 3996 3997 3998 3999
	/* 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);

4000
	kfree(orig_data);
4001 4002
	return 0;

4003
cantfind_ext4:
4004
	if (!silent)
4005
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4006 4007
	goto failed_mount;

4008 4009
#ifdef CONFIG_QUOTA
failed_mount8:
4010
	ext4_unregister_sysfs(sb);
4011
#endif
4012 4013 4014
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4015
	ext4_mb_release(sb);
4016
	if (sbi->s_flex_groups)
A
Al Viro 已提交
4017
		kvfree(sbi->s_flex_groups);
4018 4019 4020 4021
	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);
4022
failed_mount5:
4023 4024 4025
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4026
	dput(sb->s_root);
4027
	sb->s_root = NULL;
A
Al Viro 已提交
4028
failed_mount4:
4029
	ext4_msg(sb, KERN_ERR, "mount failed");
4030 4031
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4032
failed_mount_wq:
J
Jan Kara 已提交
4033 4034 4035 4036
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
4037 4038 4039 4040
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4041
failed_mount3a:
4042
	ext4_es_unregister_shrinker(sbi);
4043
failed_mount3:
4044
	del_timer_sync(&sbi->s_err_report);
4045 4046
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4047 4048 4049
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
4050
	kvfree(sbi->s_group_desc);
4051
failed_mount:
4052 4053
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4054
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4055
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4056 4057
		kfree(sbi->s_qf_names[i]);
#endif
4058
	ext4_blkdev_remove(sbi);
4059 4060 4061
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4062
	kfree(sbi->s_blockgroup_lock);
4063
	kfree(sbi);
4064
out_free_orig:
4065
	kfree(orig_data);
4066
	return err ? err : ret;
4067 4068 4069 4070 4071 4072 4073
}

/*
 * 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.
 */
4074
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4075
{
4076
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4077

4078 4079 4080
	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;
4081

4082
	write_lock(&journal->j_state_lock);
4083
	if (test_opt(sb, BARRIER))
4084
		journal->j_flags |= JBD2_BARRIER;
4085
	else
4086
		journal->j_flags &= ~JBD2_BARRIER;
4087 4088 4089 4090
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4091
	write_unlock(&journal->j_state_lock);
4092 4093
}

4094
static journal_t *ext4_get_journal(struct super_block *sb,
4095 4096 4097 4098 4099
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4100
	BUG_ON(!ext4_has_feature_journal(sb));
4101

4102 4103 4104 4105
	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

4106 4107
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4108
		ext4_msg(sb, KERN_ERR, "no journal found");
4109 4110 4111 4112 4113
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4114
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4115 4116 4117
		return NULL;
	}

4118
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4119
		  journal_inode, journal_inode->i_size);
4120
	if (!S_ISREG(journal_inode->i_mode)) {
4121
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4122 4123 4124 4125
		iput(journal_inode);
		return NULL;
	}

4126
	journal = jbd2_journal_init_inode(journal_inode);
4127
	if (!journal) {
4128
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4129 4130 4131 4132
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4133
	ext4_init_journal_params(sb, journal);
4134 4135 4136
	return journal;
}

4137
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4138 4139
				       dev_t j_dev)
{
4140
	struct buffer_head *bh;
4141
	journal_t *journal;
4142 4143
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4144
	int hblock, blocksize;
4145
	ext4_fsblk_t sb_block;
4146
	unsigned long offset;
4147
	struct ext4_super_block *es;
4148 4149
	struct block_device *bdev;

4150
	BUG_ON(!ext4_has_feature_journal(sb));
4151

4152
	bdev = ext4_blkdev_get(j_dev, sb);
4153 4154 4155 4156
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4157
	hblock = bdev_logical_block_size(bdev);
4158
	if (blocksize < hblock) {
4159 4160
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4161 4162 4163
		goto out_bdev;
	}

4164 4165
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4166 4167
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4168 4169
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4170 4171 4172
		goto out_bdev;
	}

4173
	es = (struct ext4_super_block *) (bh->b_data + offset);
4174
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4175
	    !(le32_to_cpu(es->s_feature_incompat) &
4176
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4177 4178
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4179 4180 4181 4182
		brelse(bh);
		goto out_bdev;
	}

4183 4184 4185 4186 4187 4188 4189 4190 4191
	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;
	}

4192
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4193
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4194 4195 4196 4197
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4198
	len = ext4_blocks_count(es);
4199 4200 4201
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4202
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4203 4204
					start, len, blocksize);
	if (!journal) {
4205
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4206 4207 4208
		goto out_bdev;
	}
	journal->j_private = sb;
4209
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4210 4211
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4212
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4213 4214 4215
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4216 4217
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4218 4219 4220
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4221 4222
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4223
	return journal;
4224

4225
out_journal:
4226
	jbd2_journal_destroy(journal);
4227
out_bdev:
4228
	ext4_blkdev_put(bdev);
4229 4230 4231
	return NULL;
}

4232 4233
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4234 4235 4236 4237 4238 4239 4240 4241
			     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;

4242
	BUG_ON(!ext4_has_feature_journal(sb));
4243

4244 4245
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4246 4247
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258
		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.
	 */
4259
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4260
		if (sb->s_flags & MS_RDONLY) {
4261 4262
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4263
			if (really_read_only) {
4264 4265
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4266 4267
				return -EROFS;
			}
4268 4269
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4270 4271 4272 4273
		}
	}

	if (journal_inum && journal_dev) {
4274 4275
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4276 4277 4278 4279
		return -EINVAL;
	}

	if (journal_inum) {
4280
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4281 4282
			return -EINVAL;
	} else {
4283
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4284 4285 4286
			return -EINVAL;
	}

4287
	if (!(journal->j_flags & JBD2_BARRIER))
4288
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4289

4290
	if (!ext4_has_feature_journal_needs_recovery(sb))
4291
		err = jbd2_journal_wipe(journal, !really_read_only);
4292 4293 4294 4295 4296
	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);
4297
		err = jbd2_journal_load(journal);
4298 4299 4300 4301 4302
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4303 4304

	if (err) {
4305
		ext4_msg(sb, KERN_ERR, "error loading journal");
4306
		jbd2_journal_destroy(journal);
4307 4308 4309
		return err;
	}

4310 4311
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4312

4313
	if (!really_read_only && journal_devnum &&
4314 4315 4316 4317
	    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. */
4318
		ext4_commit_super(sb, 1);
4319 4320 4321 4322 4323
	}

	return 0;
}

4324
static int ext4_commit_super(struct super_block *sb, int sync)
4325
{
4326
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4327
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4328
	int error = 0;
4329

4330
	if (!sbh || block_device_ejected(sb))
4331
		return error;
4332 4333 4334 4335 4336 4337 4338 4339 4340
	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.
		 */
4341 4342
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4343 4344 4345
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357
	/*
	 * 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());
4358 4359 4360
	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
4361 4362
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4363 4364 4365
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4366 4367
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4368 4369
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4370 4371 4372
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4373
				&EXT4_SB(sb)->s_freeinodes_counter));
4374
	BUFFER_TRACE(sbh, "marking dirty");
4375
	ext4_superblock_csum_set(sb);
4376
	mark_buffer_dirty(sbh);
4377
	if (sync) {
4378 4379
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4380 4381 4382 4383 4384
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4385 4386
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4387 4388 4389 4390
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4391
	return error;
4392 4393 4394 4395 4396 4397 4398
}

/*
 * 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.
 */
4399 4400
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4401
{
4402
	journal_t *journal = EXT4_SB(sb)->s_journal;
4403

4404
	if (!ext4_has_feature_journal(sb)) {
4405 4406 4407
		BUG_ON(journal != NULL);
		return;
	}
4408
	jbd2_journal_lock_updates(journal);
4409 4410 4411
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4412
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4413
	    sb->s_flags & MS_RDONLY) {
4414
		ext4_clear_feature_journal_needs_recovery(sb);
4415
		ext4_commit_super(sb, 1);
4416
	}
4417 4418

out:
4419
	jbd2_journal_unlock_updates(journal);
4420 4421 4422 4423 4424 4425 4426
}

/*
 * 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.
 */
4427 4428
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4429 4430 4431 4432 4433
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4434
	BUG_ON(!ext4_has_feature_journal(sb));
4435

4436
	journal = EXT4_SB(sb)->s_journal;
4437 4438 4439

	/*
	 * Now check for any error status which may have been recorded in the
4440
	 * journal by a prior ext4_error() or ext4_abort()
4441 4442
	 */

4443
	j_errno = jbd2_journal_errno(journal);
4444 4445 4446
	if (j_errno) {
		char nbuf[16];

4447
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4448
		ext4_warning(sb, "Filesystem error recorded "
4449
			     "from previous mount: %s", errstr);
4450
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4451

4452 4453
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4454
		ext4_commit_super(sb, 1);
4455

4456
		jbd2_journal_clear_err(journal);
4457
		jbd2_journal_update_sb_errno(journal);
4458 4459 4460 4461 4462 4463 4464
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4465
int ext4_force_commit(struct super_block *sb)
4466 4467 4468 4469 4470 4471
{
	journal_t *journal;

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

4472
	journal = EXT4_SB(sb)->s_journal;
4473
	return ext4_journal_force_commit(journal);
4474 4475
}

4476
static int ext4_sync_fs(struct super_block *sb, int wait)
4477
{
4478
	int ret = 0;
4479
	tid_t target;
4480
	bool needs_barrier = false;
4481
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4482

4483
	trace_ext4_sync_fs(sb, wait);
4484
	flush_workqueue(sbi->rsv_conversion_wq);
4485 4486 4487 4488 4489
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4490 4491 4492 4493 4494
	/*
	 * 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.
	 */
4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506
	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))
4507 4508 4509 4510 4511 4512
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4513
	}
4514 4515 4516 4517

	return ret;
}

4518 4519 4520
/*
 * 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.
4521 4522
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4523 4524
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4525
 */
4526
static int ext4_freeze(struct super_block *sb)
4527
{
4528 4529
	int error = 0;
	journal_t *journal;
4530

4531 4532
	if (sb->s_flags & MS_RDONLY)
		return 0;
4533

4534
	journal = EXT4_SB(sb)->s_journal;
4535

4536 4537 4538
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4539

4540 4541 4542 4543 4544 4545 4546
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4547 4548

		/* Journal blocked and flushed, clear needs_recovery flag. */
4549
		ext4_clear_feature_journal_needs_recovery(sb);
4550
	}
4551 4552

	error = ext4_commit_super(sb, 1);
4553
out:
4554 4555 4556
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4557
	return error;
4558 4559 4560 4561 4562 4563
}

/*
 * 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.
 */
4564
static int ext4_unfreeze(struct super_block *sb)
4565
{
4566 4567 4568
	if (sb->s_flags & MS_RDONLY)
		return 0;

4569 4570
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4571
		ext4_set_feature_journal_needs_recovery(sb);
4572 4573
	}

4574
	ext4_commit_super(sb, 1);
4575
	return 0;
4576 4577
}

4578 4579 4580 4581 4582
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4583
	unsigned long s_mount_opt2;
4584 4585
	kuid_t s_resuid;
	kgid_t s_resgid;
4586 4587 4588 4589
	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
4590
	char *s_qf_names[EXT4_MAXQUOTAS];
4591 4592 4593
#endif
};

4594
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4595
{
4596
	struct ext4_super_block *es;
4597
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4598
	unsigned long old_sb_flags;
4599
	struct ext4_mount_options old_opts;
4600
	int enable_quota = 0;
4601
	ext4_group_t g;
4602
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4603
	int err = 0;
4604
#ifdef CONFIG_QUOTA
4605
	int i, j;
4606
#endif
4607
	char *orig_data = kstrdup(data, GFP_KERNEL);
4608 4609 4610 4611

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4612
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4613 4614 4615
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4616 4617
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4618 4619
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4620
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4621 4622 4623 4624 4625 4626
		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]);
4627
				kfree(orig_data);
4628 4629 4630 4631
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4632
#endif
4633 4634
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4635

4636
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4637 4638 4639 4640
		err = -EINVAL;
		goto restore_opts;
	}

4641
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4642 4643
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4644 4645
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4646 4647
	}

4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660
	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
4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672
		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;
4673 4674
	}

4675
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4676
		ext4_abort(sb, "Abort forced by user");
4677 4678

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4679
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4680 4681 4682

	es = sbi->s_es;

4683
	if (sbi->s_journal) {
4684
		ext4_init_journal_params(sb, sbi->s_journal);
4685 4686
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4687

4688 4689 4690
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4691
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4692
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4693 4694 4695 4696 4697
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4698 4699 4700
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4701 4702
			err = dquot_suspend(sb, -1);
			if (err < 0)
4703 4704
				goto restore_opts;

4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715
			/*
			 * 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.
			 */
4716 4717
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4718 4719
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4720
			if (sbi->s_journal)
4721
				ext4_mark_recovery_complete(sb, es);
4722
		} else {
4723
			/* Make sure we can mount this feature set readwrite */
4724
			if (ext4_has_feature_readonly(sb) ||
D
Darrick J. Wong 已提交
4725
			    !ext4_feature_set_ok(sb, 0)) {
4726 4727 4728
				err = -EROFS;
				goto restore_opts;
			}
4729 4730
			/*
			 * Make sure the group descriptor checksums
4731
			 * are sane.  If they aren't, refuse to remount r/w.
4732 4733 4734 4735 4736
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4737
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4738 4739
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4740
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
4741
					       le16_to_cpu(gdp->bg_checksum));
4742
					err = -EFSBADCRC;
4743 4744 4745 4746
					goto restore_opts;
				}
			}

4747 4748 4749 4750 4751 4752
			/*
			 * 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) {
4753
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4754 4755
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4756
				       "umount/remount instead");
4757 4758 4759 4760
				err = -EINVAL;
				goto restore_opts;
			}

4761 4762 4763 4764 4765 4766
			/*
			 * 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.)
			 */
4767 4768
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4769
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4770
			if (!ext4_setup_super(sb, es, 0))
4771
				sb->s_flags &= ~MS_RDONLY;
4772
			if (ext4_has_feature_mmp(sb))
4773 4774 4775 4776 4777
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4778
			enable_quota = 1;
4779 4780
		}
	}
4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793

	/*
	 * 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);
	}

4794
	ext4_setup_system_zone(sb);
4795
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4796
		ext4_commit_super(sb, 1);
4797

4798 4799
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4800
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4801
		kfree(old_opts.s_qf_names[i]);
4802 4803 4804
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
4805
		else if (ext4_has_feature_quota(sb)) {
4806
			err = ext4_enable_quotas(sb);
4807
			if (err)
4808 4809 4810
				goto restore_opts;
		}
	}
4811
#endif
4812

4813
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4814 4815
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4816
	return 0;
4817

4818 4819 4820
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4821
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4822 4823 4824
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4825 4826
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4827 4828
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
4829
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
4830
		kfree(sbi->s_qf_names[i]);
4831 4832 4833
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4834
	kfree(orig_data);
4835 4836 4837
	return err;
}

L
Li Xi 已提交
4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879
#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

4880
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4881 4882
{
	struct super_block *sb = dentry->d_sb;
4883 4884
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
4885
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
4886
	u64 fsid;
4887
	s64 bfree;
L
Lukas Czerner 已提交
4888
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4889

4890 4891
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4892

4893
	buf->f_type = EXT4_SUPER_MAGIC;
4894
	buf->f_bsize = sb->s_blocksize;
4895
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4896 4897
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4898
	/* prevent underflow in case that few free space is available */
4899
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
4900 4901 4902
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4903 4904
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
4905
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4906
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
4907 4908 4909 4910
	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;
4911

L
Li Xi 已提交
4912 4913 4914 4915 4916
#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
4917 4918 4919
	return 0;
}

4920 4921
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4922
 * Process 1                         Process 2
4923
 * ext4_create()                     quota_sync()
4924
 *   jbd2_journal_start()                  write_dquot()
4925
 *   dquot_initialize()                         down(dqio_mutex)
4926
 *     down(dqio_mutex)                    jbd2_journal_start()
4927 4928 4929 4930 4931 4932 4933
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4934
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4935 4936
}

4937
static int ext4_write_dquot(struct dquot *dquot)
4938 4939 4940 4941 4942 4943
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4944
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4945
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4946 4947 4948
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4949
	err = ext4_journal_stop(handle);
4950 4951 4952 4953 4954
	if (!ret)
		ret = err;
	return ret;
}

4955
static int ext4_acquire_dquot(struct dquot *dquot)
4956 4957 4958 4959
{
	int ret, err;
	handle_t *handle;

4960
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4961
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4962 4963 4964
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4965
	err = ext4_journal_stop(handle);
4966 4967 4968 4969 4970
	if (!ret)
		ret = err;
	return ret;
}

4971
static int ext4_release_dquot(struct dquot *dquot)
4972 4973 4974 4975
{
	int ret, err;
	handle_t *handle;

4976
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4977
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
4978 4979 4980
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4981
		return PTR_ERR(handle);
J
Jan Kara 已提交
4982
	}
4983
	ret = dquot_release(dquot);
4984
	err = ext4_journal_stop(handle);
4985 4986 4987 4988 4989
	if (!ret)
		ret = err;
	return ret;
}

4990
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4991
{
4992 4993 4994
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

4995
	/* Are we journaling quotas? */
4996
	if (ext4_has_feature_quota(sb) ||
4997
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
4998
		dquot_mark_dquot_dirty(dquot);
4999
		return ext4_write_dquot(dquot);
5000 5001 5002 5003 5004
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5005
static int ext4_write_info(struct super_block *sb, int type)
5006 5007 5008 5009 5010
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5011
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5012 5013 5014
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5015
	err = ext4_journal_stop(handle);
5016 5017 5018 5019 5020 5021 5022 5023 5024
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5025
static int ext4_quota_on_mount(struct super_block *sb, int type)
5026
{
5027 5028
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5029 5030
}

5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044
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);
}

5045 5046 5047
/*
 * Standard function to be called on quota_on
 */
5048
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5049
			 struct path *path)
5050 5051 5052 5053 5054
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5055

5056
	/* Quotafile not on the same filesystem? */
5057
	if (path->dentry->d_sb != sb)
5058
		return -EXDEV;
5059 5060
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5061
		/* Quotafile not in fs root? */
5062
		if (path->dentry->d_parent != sb->s_root)
5063 5064 5065
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5066
	}
5067 5068 5069 5070 5071

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5072
	if (EXT4_SB(sb)->s_journal &&
5073
	    ext4_should_journal_data(d_inode(path->dentry))) {
5074 5075 5076 5077 5078
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5079
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5080
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5081
		if (err)
5082
			return err;
5083
	}
5084 5085 5086 5087 5088 5089
	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;
5090 5091
}

5092 5093 5094 5095 5096
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
5097
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5098
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5099 5100
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5101 5102
	};

5103
	BUG_ON(!ext4_has_feature_quota(sb));
5104 5105 5106 5107 5108 5109 5110 5111 5112 5113

	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
5114 5115
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5116
	lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5117 5118
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);
5119 5120
	if (err)
		lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5121 5122 5123 5124 5125 5126 5127 5128

	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
5129
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5130
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5131 5132
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5133 5134 5135
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5136
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5137 5138 5139 5140 5141
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5142 5143 5144
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5145 5146 5147 5148 5149 5150 5151
				return err;
			}
		}
	}
	return 0;
}

5152 5153
static int ext4_quota_off(struct super_block *sb, int type)
{
5154 5155 5156
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5157 5158 5159
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5160 5161
		sync_filesystem(sb);

5162 5163 5164
	if (!inode)
		goto out;

5165 5166
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5167
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5168 5169 5170 5171 5172 5173 5174
	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:
5175 5176 5177
	return dquot_quota_off(sb, type);
}

5178 5179
/* 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
5180
 * itself serializes the operations (and no one else should touch the files)
5181
 * we don't have to be afraid of races */
5182
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5183 5184 5185
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5186
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200
	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;
5201 5202 5203
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218
		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) */
5219
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5220 5221 5222
				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
5223
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5224
	int err, offset = off & (sb->s_blocksize - 1);
5225
	int retries = 0;
5226 5227 5228
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5229
	if (EXT4_SB(sb)->s_journal && !handle) {
5230 5231
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5232 5233 5234
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245
	/*
	 * 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;
	}

5246 5247 5248 5249 5250 5251
	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));
5252 5253
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5254 5255
	if (!bh)
		goto out;
5256
	BUFFER_TRACE(bh, "get write access");
5257 5258 5259
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5260
		return err;
5261
	}
5262 5263 5264 5265
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5266
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5267
	brelse(bh);
5268
out:
5269 5270
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5271
		EXT4_I(inode)->i_disksize = inode->i_size;
5272
		ext4_mark_inode_dirty(handle, inode);
5273
	}
5274
	return len;
5275 5276 5277 5278
}

#endif

A
Al Viro 已提交
5279 5280
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5281
{
A
Al Viro 已提交
5282
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5283 5284
}

J
Jan Kara 已提交
5285
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297
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);
}
5298 5299 5300

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5301
	if (ext4_has_unknown_ext2_incompat_features(sb))
5302 5303 5304
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5305
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5306 5307 5308
		return 0;
	return 1;
}
5309 5310 5311
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5312
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326
#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);
}
5327 5328 5329

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5330
	if (ext4_has_unknown_ext3_incompat_features(sb))
5331
		return 0;
5332
	if (!ext4_has_feature_journal(sb))
5333 5334 5335
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5336
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5337 5338 5339
		return 0;
	return 1;
}
5340

T
Theodore Ts'o 已提交
5341 5342 5343
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5344
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5345 5346 5347
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5348
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5349

5350 5351 5352
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];

5353
static int __init ext4_init_fs(void)
5354
{
5355
	int i, err;
5356

5357
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5358 5359 5360
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5361
	/* Build-time check for flags consistency */
5362
	ext4_check_flag_values();
5363

5364
	for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5365 5366
		init_waitqueue_head(&ext4__ioend_wq[i]);

5367
	err = ext4_init_es();
5368 5369
	if (err)
		return err;
5370 5371 5372

	err = ext4_init_pageio();
	if (err)
5373
		goto out5;
5374

5375
	err = ext4_init_system_zone();
5376
	if (err)
5377
		goto out4;
5378

5379
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5380
	if (err)
5381
		goto out3;
5382

5383
	err = ext4_init_mballoc();
5384 5385
	if (err)
		goto out2;
5386 5387 5388
	err = init_inodecache();
	if (err)
		goto out1;
5389
	register_as_ext3();
5390
	register_as_ext2();
T
Theodore Ts'o 已提交
5391
	err = register_filesystem(&ext4_fs_type);
5392 5393
	if (err)
		goto out;
5394

5395 5396
	return 0;
out:
5397 5398
	unregister_as_ext2();
	unregister_as_ext3();
5399 5400
	destroy_inodecache();
out1:
5401
	ext4_exit_mballoc();
5402
out2:
5403 5404
	ext4_exit_sysfs();
out3:
5405
	ext4_exit_system_zone();
5406
out4:
5407
	ext4_exit_pageio();
5408
out5:
5409 5410
	ext4_exit_es();

5411 5412 5413
	return err;
}

5414
static void __exit ext4_exit_fs(void)
5415
{
5416
	ext4_exit_crypto();
5417
	ext4_destroy_lazyinit_thread();
5418 5419
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5420
	unregister_filesystem(&ext4_fs_type);
5421
	destroy_inodecache();
5422
	ext4_exit_mballoc();
5423
	ext4_exit_sysfs();
5424 5425
	ext4_exit_system_zone();
	ext4_exit_pageio();
5426
	ext4_exit_es();
5427 5428 5429
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5430
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5431
MODULE_LICENSE("GPL");
5432 5433
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)