super.c 161.8 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 <linux/uaccess.h>
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#include <linux/kthread.h>
#include <linux/freezer.h>

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

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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
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static struct ratelimit_state ext4_mount_msg_ratelimit;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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static struct inode *ext4_get_journal_inode(struct super_block *sb,
					    unsigned int journal_inum);
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/*
 * Lock ordering
 *
 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
 * i_mmap_rwsem (inode->i_mmap_rwsem)!
 *
 * page fault path:
 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
 *   page lock -> i_data_sem (rw)
 *
 * buffered write path:
 * sb_start_write -> i_mutex -> mmap_sem
 * sb_start_write -> i_mutex -> transaction start -> page lock ->
 *   i_data_sem (rw)
 *
 * truncate:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   i_mmap_rwsem (w) -> page lock
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
 *   transaction start -> i_data_sem (rw)
 *
 * direct IO:
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
 *   transaction start -> i_data_sem (rw)
 *
 * writepages:
 * transaction start -> page lock(s) -> i_data_sem (rw)
 */

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


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

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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

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

	return cpu_to_le32(csum);
}

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

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

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

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	if (!ext4_has_metadata_csum(sb))
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		return;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return bdi->dev == NULL;
}

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

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

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

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

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

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	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return;

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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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	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
		return;

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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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	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
		return;

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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);
	}
526
	save_error_info(inode->i_sb, function, line);
527 528 529
	ext4_handle_error(inode->i_sb);
}

530 531
const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
532 533 534 535
{
	char *errstr = NULL;

	switch (errno) {
536 537 538 539 540 541
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
542 543 544 545 546 547 548
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
549 550
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
			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;
}

570
/* __ext4_std_error decodes expected errors from journaling functions
571 572
 * automatically and invokes the appropriate error response.  */

573 574
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
575 576 577 578
{
	char nbuf[16];
	const char *errstr;

579 580 581
	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return;

582 583 584 585 586 587 588
	/* 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;

589 590 591 592 593
	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);
	}
594

595
	save_error_info(sb, function, line);
596
	ext4_handle_error(sb);
597 598 599
}

/*
600
 * ext4_abort is a much stronger failure handler than ext4_error.  The
601 602 603 604 605 606 607 608
 * 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.
 */

609
void __ext4_abort(struct super_block *sb, const char *function,
610
		unsigned int line, const char *fmt, ...)
611
{
612
	struct va_format vaf;
613 614
	va_list args;

615 616 617
	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return;

618
	save_error_info(sb, function, line);
619
	va_start(args, fmt);
620 621 622 623
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
624 625
	va_end(args);

626 627 628
	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;
629 630 631 632 633 634
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
635 636 637 638
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
639 640 641 642
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
643
		panic("EXT4-fs panic from previous error\n");
644
	}
645 646
}

647 648
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
649
{
J
Joe Perches 已提交
650
	struct va_format vaf;
651 652
	va_list args;

653 654 655
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

656
	va_start(args, fmt);
J
Joe Perches 已提交
657 658 659
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
660 661 662
	va_end(args);
}

663 664 665 666
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

667
void __ext4_warning(struct super_block *sb, const char *function,
668
		    unsigned int line, const char *fmt, ...)
669
{
J
Joe Perches 已提交
670
	struct va_format vaf;
671 672
	va_list args;

673
	if (!ext4_warning_ratelimit(sb))
674 675
		return;

676
	va_start(args, fmt);
J
Joe Perches 已提交
677 678 679 680
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
681 682 683
	va_end(args);
}

684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
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);
}

702 703 704 705
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, ...)
706 707 708
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
709
	struct va_format vaf;
710 711 712
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

713 714 715
	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return;

716 717 718
	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
719

720 721 722 723 724 725 726 727 728 729 730 731 732 733
	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);
	}
734 735

	if (test_opt(sb, ERRORS_CONT)) {
736
		ext4_commit_super(sb, 0);
737 738
		return;
	}
739

740 741 742 743 744 745 746 747
	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
748
	 * ext4_grp_locked_error() to distinguish between the
749 750 751 752 753 754 755 756
	 * 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;
}

757
void ext4_update_dynamic_rev(struct super_block *sb)
758
{
759
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
760

761
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
762 763
		return;

764
	ext4_warning(sb,
765 766
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
767
		     EXT4_DYNAMIC_REV);
768

769 770 771
	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);
772 773 774 775 776 777 778 779 780 781 782 783 784
	/* 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
 */
785
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
786 787 788 789
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

790
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
791 792 793 794 795
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
796
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
797 798 799 800 801 802 803
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
804
static void ext4_blkdev_put(struct block_device *bdev)
805
{
A
Al Viro 已提交
806
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
807 808
}

A
Al Viro 已提交
809
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
810 811 812 813
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
814
		ext4_blkdev_put(bdev);
815 816 817 818 819 820
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
821
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
822 823
}

824
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
825 826 827
{
	struct list_head *l;

828 829
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
830 831 832 833 834 835 836 837 838 839 840 841

	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));
	}
}

842
static void ext4_put_super(struct super_block *sb)
843
{
844 845
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
846
	int aborted = 0;
847
	int i, err;
848

849
	ext4_unregister_li_request(sb);
850 851
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

852 853
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
854

855
	if (sbi->s_journal) {
856
		aborted = is_journal_aborted(sbi->s_journal);
857 858
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
859
		if ((err < 0) && !aborted)
860
			ext4_abort(sb, "Couldn't clean up the journal");
861
	}
862

863
	ext4_unregister_sysfs(sb);
864
	ext4_es_unregister_shrinker(sbi);
865
	del_timer_sync(&sbi->s_err_report);
866 867 868 869
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);

870
	if (!(sb->s_flags & MS_RDONLY) && !aborted) {
871
		ext4_clear_feature_journal_needs_recovery(sb);
872 873
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
874
	if (!(sb->s_flags & MS_RDONLY))
875 876
		ext4_commit_super(sb, 1);

877 878
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
879 880
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
881
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
882 883
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
884
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
885
	percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
886
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
887
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
888 889 890 891 892 893 894 895 896 897 898
		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));

899
	sync_blockdev(sb->s_bdev);
900
	invalidate_bdev(sb->s_bdev);
901 902 903 904 905 906 907
	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);
908
		invalidate_bdev(sbi->journal_bdev);
909
		ext4_blkdev_remove(sbi);
910
	}
911 912 913 914
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
915 916
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
917
	brelse(sbi->s_sbh);
918
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
919 920 921 922 923 924
	/*
	 * 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);
925 926
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
927
	kfree(sbi->s_blockgroup_lock);
928 929 930
	kfree(sbi);
}

931
static struct kmem_cache *ext4_inode_cachep;
932 933 934 935

/*
 * Called inside transaction, so use GFP_NOFS
 */
936
static struct inode *ext4_alloc_inode(struct super_block *sb)
937
{
938
	struct ext4_inode_info *ei;
939

C
Christoph Lameter 已提交
940
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
941 942
	if (!ei)
		return NULL;
943

944
	ei->vfs_inode.i_version = 1;
945
	spin_lock_init(&ei->i_raw_lock);
946 947
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
948 949
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
950
	INIT_LIST_HEAD(&ei->i_es_list);
951
	ei->i_es_all_nr = 0;
952
	ei->i_es_shk_nr = 0;
953
	ei->i_es_shrink_lblk = 0;
954 955 956
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
957
	ei->i_da_metadata_calc_len = 0;
958
	ei->i_da_metadata_calc_last_lblock = 0;
959
	spin_lock_init(&(ei->i_block_reservation_lock));
960 961
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
962
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
963
#endif
964
	ei->jinode = NULL;
965
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
966
	spin_lock_init(&ei->i_completed_io_lock);
967 968
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
969
	atomic_set(&ei->i_unwritten, 0);
970
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
971 972 973
	return &ei->vfs_inode;
}

974 975 976 977 978 979 980 981
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
982 983 984 985 986 987
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));
}

988
static void ext4_destroy_inode(struct inode *inode)
989
{
990
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
991 992 993
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
994 995 996 997 998
		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
999
	call_rcu(&inode->i_rcu, ext4_i_callback);
1000 1001
}

1002
static void init_once(void *foo)
1003
{
1004
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1005

C
Christoph Lameter 已提交
1006 1007
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
1008
	init_rwsem(&ei->i_data_sem);
1009
	init_rwsem(&ei->i_mmap_sem);
C
Christoph Lameter 已提交
1010
	inode_init_once(&ei->vfs_inode);
1011 1012
}

1013
static int __init init_inodecache(void)
1014
{
1015 1016
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
1017
					     0, (SLAB_RECLAIM_ACCOUNT|
1018
						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1019
					     init_once);
1020
	if (ext4_inode_cachep == NULL)
1021 1022 1023 1024 1025 1026
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
1027 1028 1029 1030 1031
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
1032
	kmem_cache_destroy(ext4_inode_cachep);
1033 1034
}

A
Al Viro 已提交
1035
void ext4_clear_inode(struct inode *inode)
1036
{
A
Al Viro 已提交
1037
	invalidate_inode_buffers(inode);
1038
	clear_inode(inode);
1039
	dquot_drop(inode);
1040
	ext4_discard_preallocations(inode);
1041
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1042 1043 1044 1045 1046 1047
	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;
	}
1048
#ifdef CONFIG_EXT4_FS_ENCRYPTION
1049
	fscrypt_put_encryption_info(inode, NULL);
1050
#endif
1051 1052
}

C
Christoph Hellwig 已提交
1053
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1054
					u64 ino, u32 generation)
1055 1056 1057
{
	struct inode *inode;

1058
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1059
		return ERR_PTR(-ESTALE);
1060
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1061 1062 1063 1064
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1065
	 * ext4_read_inode will return a bad_inode if the inode had been
1066 1067 1068 1069 1070
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1071
	inode = ext4_iget_normal(sb, ino);
1072 1073 1074
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1075 1076 1077
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1078 1079 1080 1081 1082

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1083
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1084 1085 1086 1087 1088 1089
{
	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,
1090
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1091 1092 1093
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1094 1095
}

1096 1097 1098 1099 1100 1101
/*
 * 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.
 */
1102 1103
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1104 1105 1106 1107 1108 1109 1110 1111
{
	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,
1112
						wait & ~__GFP_DIRECT_RECLAIM);
1113 1114 1115
	return try_to_free_buffers(page);
}

1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
#ifdef CONFIG_EXT4_FS_ENCRYPTION
static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
{
	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
				 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
}

static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
							void *fs_data)
{
1126 1127 1128
	handle_t *handle = fs_data;
	int res, res2, retries = 0;

1129 1130 1131 1132
	res = ext4_convert_inline_data(inode);
	if (res)
		return res;

1133 1134 1135 1136 1137 1138 1139
	/*
	 * If a journal handle was specified, then the encryption context is
	 * being set on a new inode via inheritance and is part of a larger
	 * transaction to create the inode.  Otherwise the encryption context is
	 * being set on an existing inode in its own transaction.  Only in the
	 * latter case should the "retry on ENOSPC" logic be used.
	 */
1140

1141 1142 1143 1144 1145
	if (handle) {
		res = ext4_xattr_set_handle(handle, inode,
					    EXT4_XATTR_INDEX_ENCRYPTION,
					    EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
					    ctx, len, 0);
1146 1147 1148 1149
		if (!res) {
			ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
			ext4_clear_inode_state(inode,
					EXT4_STATE_MAY_INLINE_DATA);
1150 1151 1152 1153
			/*
			 * Update inode->i_flags - e.g. S_DAX may get disabled
			 */
			ext4_set_inode_flags(inode);
1154 1155 1156 1157
		}
		return res;
	}

1158
retry:
1159 1160 1161 1162 1163
	handle = ext4_journal_start(inode, EXT4_HT_MISC,
			ext4_jbd2_credits_xattr(inode));
	if (IS_ERR(handle))
		return PTR_ERR(handle);

1164 1165 1166
	res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
				    EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
				    ctx, len, 0);
1167 1168
	if (!res) {
		ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1169 1170
		/* Update inode->i_flags - e.g. S_DAX may get disabled */
		ext4_set_inode_flags(inode);
1171 1172 1173 1174 1175
		res = ext4_mark_inode_dirty(handle, inode);
		if (res)
			EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
	}
	res2 = ext4_journal_stop(handle);
1176 1177 1178

	if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
		goto retry;
1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194
	if (!res)
		res = res2;
	return res;
}

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

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

1195
static const struct fscrypt_operations ext4_cryptops = {
1196
	.key_prefix		= "ext4:",
1197 1198 1199 1200 1201 1202 1203 1204
	.get_context		= ext4_get_context,
	.set_context		= ext4_set_context,
	.dummy_context		= ext4_dummy_context,
	.is_encrypted		= ext4_encrypted_inode,
	.empty_dir		= ext4_empty_dir,
	.max_namelen		= ext4_max_namelen,
};
#else
1205
static const struct fscrypt_operations ext4_cryptops = {
1206 1207 1208 1209
	.is_encrypted		= ext4_encrypted_inode,
};
#endif

1210
#ifdef CONFIG_QUOTA
L
Li Xi 已提交
1211 1212
static char *quotatypes[] = INITQFNAMES;
#define QTYPE2NAME(t) (quotatypes[t])
1213

1214 1215 1216 1217 1218
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);
1219
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
A
Al Viro 已提交
1220
			 const struct path *path);
1221
static int ext4_quota_off(struct super_block *sb, int type);
1222 1223
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,
1224
			       size_t len, loff_t off);
1225
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1226
				const char *data, size_t len, loff_t off);
1227 1228 1229
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);
1230
static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1231

J
Jan Kara 已提交
1232 1233 1234 1235 1236
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1237
static const struct dquot_operations ext4_quota_operations = {
1238
	.get_reserved_space = ext4_get_reserved_space,
1239 1240 1241 1242
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1243 1244 1245
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
L
Li Xi 已提交
1246
	.get_projid	= ext4_get_projid,
1247
	.get_next_id	= ext4_get_next_id,
1248 1249
};

1250
static const struct quotactl_ops ext4_qctl_operations = {
1251
	.quota_on	= ext4_quota_on,
1252
	.quota_off	= ext4_quota_off,
1253
	.quota_sync	= dquot_quota_sync,
1254
	.get_state	= dquot_get_state,
1255 1256
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
1257 1258
	.set_dqblk	= dquot_set_dqblk,
	.get_nextdqblk	= dquot_get_next_dqblk,
1259 1260 1261
};
#endif

1262
static const struct super_operations ext4_sops = {
1263 1264 1265 1266
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1267
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1268
	.evict_inode	= ext4_evict_inode,
1269 1270
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1271 1272
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1273 1274 1275
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1276
#ifdef CONFIG_QUOTA
1277 1278
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1279
	.get_dquots	= ext4_get_dquots,
1280
#endif
1281
	.bdev_try_to_free_page = bdev_try_to_free_page,
1282 1283
};

1284
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1285 1286
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1287
	.get_parent = ext4_get_parent,
1288 1289 1290 1291 1292
};

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,
1293
	Opt_nouid32, Opt_debug, Opt_removed,
1294
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1295
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1296 1297
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1298
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1299
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1300
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1301
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1302
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1303
	Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1304
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1305
	Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1306
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1307
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1308
	Opt_dioread_nolock, Opt_dioread_lock,
1309
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1310
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1311 1312
};

1313
static const match_table_t tokens = {
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327
	{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"},
1328 1329
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1330 1331 1332 1333
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1334
	{Opt_noload, "norecovery"},
1335
	{Opt_noload, "noload"},
1336 1337
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1338
	{Opt_commit, "commit=%u"},
1339 1340
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1341
	{Opt_journal_dev, "journal_dev=%u"},
1342
	{Opt_journal_path, "journal_path=%s"},
1343
	{Opt_journal_checksum, "journal_checksum"},
1344
	{Opt_nojournal_checksum, "nojournal_checksum"},
1345
	{Opt_journal_async_commit, "journal_async_commit"},
1346 1347 1348 1349
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1350 1351
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1352 1353 1354 1355 1356 1357
	{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
1358
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1359 1360 1361 1362
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
1363
	{Opt_prjquota, "prjquota"},
1364
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1365 1366
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1367
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1368
	{Opt_dax, "dax"},
1369
	{Opt_stripe, "stripe=%u"},
1370
	{Opt_delalloc, "delalloc"},
1371 1372
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1373
	{Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1374
	{Opt_nodelalloc, "nodelalloc"},
1375 1376
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1377 1378
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1379
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1380
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1381
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1382 1383
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1384 1385
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1386 1387
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1388 1389 1390
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1391
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1392
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1393 1394 1395 1396 1397
	{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
1398
	{Opt_err, NULL},
1399 1400
};

1401
static ext4_fsblk_t get_sb_block(void **data)
1402
{
1403
	ext4_fsblk_t	sb_block;
1404 1405 1406 1407
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1408

1409
	options += 3;
1410
	/* TODO: use simple_strtoll with >32bit ext4 */
1411 1412
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1413
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1414 1415 1416 1417 1418 1419
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1420

1421 1422 1423
	return sb_block;
}

1424
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1425 1426
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";
1427

D
Dmitry Monakhov 已提交
1428 1429 1430 1431 1432
#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;
1433
	int ret = -1;
D
Dmitry Monakhov 已提交
1434 1435 1436 1437 1438 1439

	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");
1440
		return -1;
D
Dmitry Monakhov 已提交
1441
	}
1442
	if (ext4_has_feature_quota(sb)) {
1443 1444 1445
		ext4_msg(sb, KERN_INFO, "Journaled quota options "
			 "ignored when QUOTA feature is enabled");
		return 1;
1446
	}
D
Dmitry Monakhov 已提交
1447 1448 1449 1450
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1451
		return -1;
D
Dmitry Monakhov 已提交
1452
	}
1453 1454 1455 1456 1457 1458 1459 1460
	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
1461
	}
1462
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1463 1464
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1465
		goto errout;
D
Dmitry Monakhov 已提交
1466
	}
1467
	sbi->s_qf_names[qtype] = qname;
1468
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1469
	return 1;
1470 1471 1472
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
}

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");
1484
		return -1;
D
Dmitry Monakhov 已提交
1485
	}
1486
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1487 1488 1489 1490 1491
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1492 1493 1494 1495 1496 1497
#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
1498
#ifdef CONFIG_QUOTA
1499 1500 1501 1502 1503
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1504
#endif
1505
#define MOPT_DATAJ	0x0080
1506 1507 1508
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1509
#define MOPT_STRING	0x0400
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521

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},
1522 1523 1524 1525
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1526 1527
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1528 1529 1530
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1531
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1532 1533
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1534
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1535
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1536
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1537
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1538
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1539
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1540 1541 1542
	{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},
1543
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1544
	 MOPT_NO_EXT2},
1545
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1546
	 MOPT_NO_EXT2},
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
	{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
1557
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1558
	{Opt_stripe, 0, MOPT_GTE0},
1559 1560
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1561 1562 1563
	{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},
1564 1565 1566 1567
	{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},
1568 1569
	{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
1570
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1571 1572
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1573
#else
1574 1575
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1576
#endif
1577 1578
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1579
	{Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1580 1581 1582 1583 1584
	{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},
1585 1586
	{Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
							MOPT_SET | MOPT_Q},
1587
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1588 1589
		       EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
							MOPT_CLEAR | MOPT_Q},
1590 1591 1592 1593 1594 1595 1596
	{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},
1597
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1598
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1599 1600 1601 1602 1603 1604 1605 1606 1607
	{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;
1608 1609
	kuid_t uid;
	kgid_t gid;
1610 1611
	int arg = 0;

1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
#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
1622
	switch (token) {
1623 1624 1625 1626
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1627 1628 1629
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1630
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1631 1632 1633 1634 1635 1636 1637
		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;
1638 1639 1640 1641 1642 1643
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1644 1645
	}

1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
	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;
	}

1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666
	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;
	}

1667
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1668 1669 1670
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1671 1672 1673
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1674 1675
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1676 1677 1678
		} else
			return -1;
	}
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692
	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;
1693 1694
	} else if (token == Opt_debug_want_extra_isize) {
		sbi->s_want_extra_isize = arg;
1695 1696 1697 1698 1699
	} 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) {
1700 1701 1702 1703
		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");
1704
			return -1;
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
		}
		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);
1720 1721
			return -1;
		}
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
		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;
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762
	} 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;
		}

1763
		journal_inode = d_inode(path.dentry);
1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
		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);
1775 1776 1777 1778 1779 1780 1781 1782
	} 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);
1783 1784 1785 1786 1787 1788 1789 1790 1791
	} 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
1792 1793 1794 1795 1796
	} 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) {
1797
				ext4_msg(sb, KERN_ERR,
1798 1799
					 "Cannot change data mode on remount");
				return -1;
1800
			}
1801
		} else {
1802 1803
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1804
		}
1805 1806 1807 1808 1809 1810 1811 1812
#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;
		}
1813
		if (ext4_has_feature_quota(sb)) {
1814 1815
			ext4_msg(sb, KERN_INFO,
				 "Quota format mount options ignored "
1816
				 "when QUOTA feature is enabled");
1817
			return 1;
1818
		}
1819
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1820 1821
#endif
	} else if (token == Opt_dax) {
1822 1823 1824 1825 1826
#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
1827 1828
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1829
#endif
1830 1831 1832 1833
	} 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;
1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
	} 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;
1849
	}
1850
	return 1;
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
}

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.
		 */
1873
		args[0].to = args[0].from = NULL;
1874 1875 1876 1877
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1878 1879
	}
#ifdef CONFIG_QUOTA
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
	/*
	 * We do the test below only for project quotas. 'usrquota' and
	 * 'grpquota' mount options are allowed even without quota feature
	 * to support legacy quotas in quota files.
	 */
	if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
		ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
			 "Cannot enable project quota enforcement.");
		return 0;
	}
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1891
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1892
			clear_opt(sb, USRQUOTA);
1893

1894
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1895
			clear_opt(sb, GRPQUOTA);
1896

D
Dmitry Monakhov 已提交
1897
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1898 1899
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1900 1901 1902 1903
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1904 1905
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1906 1907 1908 1909
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1910 1911 1912 1913
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

1914
		if (blocksize < PAGE_SIZE) {
J
Jan Kara 已提交
1915 1916 1917 1918 1919
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1920 1921 1922
	return 1;
}

1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946
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])
1947
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1948 1949

	if (sbi->s_qf_names[GRPQUOTA])
1950
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1951 1952 1953
#endif
}

1954 1955
static const char *token2str(int token)
{
1956
	const struct match_token *t;
1957 1958 1959 1960 1961 1962 1963

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

1964 1965 1966 1967 1968
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1969 1970
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1971 1972 1973
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1974
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1975
	const struct mount_opts *m;
1976
	char sep = nodefs ? '\n' : ',';
1977

1978 1979
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1980 1981

	if (sbi->s_sb_block != 1)
1982 1983 1984 1985 1986 1987 1988
		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;
1989
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1990 1991 1992 1993 1994 1995
			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));
1996
	}
1997

1998
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1999
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2000 2001 2002
		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)) ||
2003
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2004 2005
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
2006
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2007 2008
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
2009
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2010
		SEQ_OPTS_PUTS("errors=continue");
2011
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2012
		SEQ_OPTS_PUTS("errors=panic");
2013
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2014
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2015
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2016
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2017
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2018
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2019
	if (sb->s_flags & MS_I_VERSION)
2020
		SEQ_OPTS_PUTS("i_version");
2021
	if (nodefs || sbi->s_stripe)
2022
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2023
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
2024 2025 2026 2027 2028 2029 2030
		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");
	}
2031 2032
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2033 2034
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
2035

2036 2037
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2038
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2039 2040
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2041 2042
	if (test_opt(sb, DATA_ERR_ABORT))
		SEQ_OPTS_PUTS("data_err=abort");
2043 2044 2045 2046 2047

	ext4_show_quota_options(seq, sb);
	return 0;
}

2048 2049 2050 2051 2052
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

2053
int ext4_seq_options_show(struct seq_file *seq, void *offset)
2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
{
	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;
}

2064
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2065 2066
			    int read_only)
{
2067
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2068 2069
	int res = 0;

2070
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2071 2072
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
2073 2074 2075
		res = MS_RDONLY;
	}
	if (read_only)
2076
		goto done;
2077
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
2078 2079
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
2080
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
2081 2082 2083
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
2084
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2085 2086
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2087 2088 2089
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
2090 2091 2092
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2093 2094 2095
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
2096
	if (!sbi->s_journal)
2097
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2098
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2099
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
2100
	le16_add_cpu(&es->s_mnt_count, 1);
2101
	es->s_mtime = cpu_to_le32(get_seconds());
2102
	ext4_update_dynamic_rev(sb);
2103
	if (sbi->s_journal)
2104
		ext4_set_feature_journal_needs_recovery(sb);
2105

2106
	ext4_commit_super(sb, 1);
2107
done:
2108
	if (test_opt(sb, DEBUG))
2109
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2110
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2111 2112
			sb->s_blocksize,
			sbi->s_groups_count,
2113 2114
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
2115
			sbi->s_mount_opt, sbi->s_mount_opt2);
2116

D
Dan Magenheimer 已提交
2117
	cleancache_init_fs(sb);
2118 2119 2120
	return res;
}

2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145
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
2146
		kvfree(sbi->s_flex_groups);
2147 2148 2149 2150 2151 2152
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

2153 2154 2155 2156 2157
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;
2158
	int i, err;
2159

2160
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2161
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2162 2163 2164 2165
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2166 2167
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2168
		goto failed;
2169 2170

	for (i = 0; i < sbi->s_groups_count; i++) {
2171
		gdp = ext4_get_group_desc(sb, i, NULL);
2172 2173

		flex_group = ext4_flex_group(sbi, i);
2174 2175
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2176 2177
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2178 2179
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2180 2181 2182 2183 2184 2185 2186
	}

	return 1;
failed:
	return 0;
}

2187
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2188
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2189
{
2190
	int offset = offsetof(struct ext4_group_desc, bg_checksum);
A
Andreas Dilger 已提交
2191
	__u16 crc = 0;
2192
	__le32 le_group = cpu_to_le32(block_group);
2193
	struct ext4_sb_info *sbi = EXT4_SB(sb);
A
Andreas Dilger 已提交
2194

2195
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2196 2197
		/* Use new metadata_csum algorithm */
		__u32 csum32;
2198
		__u16 dummy_csum = 0;
2199 2200 2201

		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
2202 2203 2204 2205 2206 2207 2208
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
				     sizeof(dummy_csum));
		offset += sizeof(dummy_csum);
		if (offset < sbi->s_desc_size)
			csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
					     sbi->s_desc_size - offset);
2209 2210 2211

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2212 2213
	}

2214
	/* old crc16 code */
2215
	if (!ext4_has_feature_gdt_csum(sb))
2216 2217
		return 0;

2218 2219 2220 2221 2222
	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...*/
2223
	if (ext4_has_feature_64bit(sb) &&
2224 2225 2226 2227 2228 2229
	    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
2230 2231 2232
	return cpu_to_le16(crc);
}

2233
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2234 2235
				struct ext4_group_desc *gdp)
{
2236
	if (ext4_has_group_desc_csum(sb) &&
2237
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
A
Andreas Dilger 已提交
2238 2239 2240 2241 2242
		return 0;

	return 1;
}

2243 2244 2245 2246 2247
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;
2248
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2249 2250
}

2251
/* Called at mount-time, super-block is locked */
2252
static int ext4_check_descriptors(struct super_block *sb,
2253
				  ext4_fsblk_t sb_block,
2254
				  ext4_group_t *first_not_zeroed)
2255
{
2256 2257 2258
	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
2259 2260 2261
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2262
	int flexbg_flag = 0;
2263
	ext4_group_t i, grp = sbi->s_groups_count;
2264

2265
	if (ext4_has_feature_flex_bg(sb))
J
Jose R. Santos 已提交
2266 2267
		flexbg_flag = 1;

2268
	ext4_debug("Checking group descriptors");
2269

2270 2271 2272
	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
2273
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2274
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2275 2276
		else
			last_block = first_block +
2277
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2278

2279 2280 2281 2282
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2283
		block_bitmap = ext4_block_bitmap(sb, gdp);
2284 2285 2286 2287 2288
		if (block_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Block bitmap for group %u overlaps "
				 "superblock", i);
		}
2289
		if (block_bitmap < first_block || block_bitmap > last_block) {
2290
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2291
			       "Block bitmap for group %u not in group "
2292
			       "(block %llu)!", i, block_bitmap);
2293 2294
			return 0;
		}
2295
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2296 2297 2298 2299 2300
		if (inode_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode bitmap for group %u overlaps "
				 "superblock", i);
		}
2301
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2302
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2303
			       "Inode bitmap for group %u not in group "
2304
			       "(block %llu)!", i, inode_bitmap);
2305 2306
			return 0;
		}
2307
		inode_table = ext4_inode_table(sb, gdp);
2308 2309 2310 2311 2312
		if (inode_table == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode table for group %u overlaps "
				 "superblock", i);
		}
L
Laurent Vivier 已提交
2313
		if (inode_table < first_block ||
2314
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2315
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2316
			       "Inode table for group %u not in group "
2317
			       "(block %llu)!", i, inode_table);
2318 2319
			return 0;
		}
2320
		ext4_lock_group(sb, i);
2321
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2322 2323
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2324
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2325
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2326
			if (!(sb->s_flags & MS_RDONLY)) {
2327
				ext4_unlock_group(sb, i);
2328
				return 0;
2329
			}
A
Andreas Dilger 已提交
2330
		}
2331
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2332 2333
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2334
	}
2335 2336
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2337 2338 2339
	return 1;
}

2340
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352
 * 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
2353
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2354 2355 2356
 * 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.
 */
2357 2358
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2359 2360
{
	unsigned int s_flags = sb->s_flags;
2361
	int ret, nr_orphans = 0, nr_truncates = 0;
2362 2363 2364 2365 2366 2367 2368 2369
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2370
	if (bdev_read_only(sb->s_bdev)) {
2371 2372
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2373 2374 2375
		return;
	}

2376 2377 2378 2379 2380 2381 2382
	/* 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;
	}

2383
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2384 2385
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2386
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2387
				  "clearing orphan list.\n");
2388 2389
			es->s_last_orphan = 0;
		}
2390 2391 2392 2393 2394
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2395
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2396 2397 2398 2399 2400 2401
		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
2402
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2403 2404
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2405
			if (ret < 0)
2406 2407 2408
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2409 2410 2411 2412 2413 2414 2415
		}
	}
#endif

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

2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
		/*
		 * We may have encountered an error during cleanup; if
		 * so, skip the rest.
		 */
		if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
			jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
			es->s_last_orphan = 0;
			break;
		}

2426 2427
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2428 2429 2430 2431
			es->s_last_orphan = 0;
			break;
		}

2432
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2433
		dquot_initialize(inode);
2434
		if (inode->i_nlink) {
2435 2436 2437 2438
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2439
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2440
				  inode->i_ino, inode->i_size);
A
Al Viro 已提交
2441
			inode_lock(inode);
2442
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2443 2444 2445
			ret = ext4_truncate(inode);
			if (ret)
				ext4_std_error(inode->i_sb, ret);
A
Al Viro 已提交
2446
			inode_unlock(inode);
2447 2448
			nr_truncates++;
		} else {
2449 2450 2451 2452
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2453 2454 2455 2456 2457 2458 2459
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2460
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2461 2462

	if (nr_orphans)
2463 2464
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2465
	if (nr_truncates)
2466 2467
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2468 2469
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2470
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2471
		if (sb_dqopt(sb)->files[i])
2472
			dquot_quota_off(sb, i);
2473 2474 2475 2476
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2477

2478 2479 2480 2481 2482 2483 2484
/*
 * 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.
 *
2485 2486 2487 2488 2489 2490
 * 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.
 *
2491 2492
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2493
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2494 2495 2496 2497 2498
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2499
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2500
		/*
2501
		 * CONFIG_LBDAF is not enabled implies the inode
2502 2503 2504 2505 2506 2507 2508 2509 2510 2511
		 * 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;
	}

2512 2513 2514 2515 2516 2517
	/*
	 * 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;
2518 2519 2520 2521 2522 2523 2524 2525
	res <<= blkbits;

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

	return res;
}
2526 2527

/*
2528
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2529 2530
 * 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.
2531
 */
2532
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2533
{
2534
	loff_t res = EXT4_NDIR_BLOCKS;
2535 2536
	int meta_blocks;
	loff_t upper_limit;
2537 2538 2539 2540 2541 2542
	/* 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.
2543 2544
	 */

2545
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2546
		/*
2547
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2548 2549
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2550 2551 2552 2553 2554 2555 2556
		 */
		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
2557 2558 2559 2560 2561 2562
		/*
		 * 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
		 */
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575
		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;
2576 2577 2578 2579 2580 2581 2582

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2583 2584 2585 2586

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2587 2588 2589
	return res;
}

2590
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2591
				   ext4_fsblk_t logical_sb_block, int nr)
2592
{
2593
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2594
	ext4_group_t bg, first_meta_bg;
2595 2596 2597 2598
	int has_super = 0;

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

2599
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2600
		return logical_sb_block + nr + 1;
2601
	bg = sbi->s_desc_per_block * nr;
2602
	if (ext4_bg_has_super(sb, bg))
2603
		has_super = 1;
2604

2605 2606 2607 2608 2609 2610 2611 2612 2613 2614
	/*
	 * 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++;

2615
	return (has_super + ext4_group_first_block_no(sb, bg));
2616 2617
}

2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633
/**
 * 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
2634
	int ret;
2635 2636

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2637
		ret = sbi->s_stripe;
2638
	else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2639
		ret = stripe_width;
2640
	else if (stride && stride <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2641 2642 2643
		ret = stride;
	else
		ret = 0;
2644

D
Dan Ehrenberg 已提交
2645 2646 2647 2648 2649 2650
	/*
	 * 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;
2651

D
Dan Ehrenberg 已提交
2652
	return ret;
2653
}
2654

2655 2656 2657 2658 2659 2660 2661 2662
/*
 * 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)
{
2663
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674
		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;

2675
	if (ext4_has_feature_readonly(sb)) {
D
Darrick J. Wong 已提交
2676 2677 2678 2679 2680
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2681
	/* Check that feature set is OK for a read-write mount */
2682
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2683 2684 2685 2686 2687 2688 2689 2690 2691 2692
		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
	 */
2693
	if (ext4_has_feature_huge_file(sb)) {
2694 2695 2696 2697 2698 2699 2700
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2701
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2702 2703 2704 2705 2706
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2707 2708

#ifndef CONFIG_QUOTA
2709
	if (ext4_has_feature_quota(sb) && !readonly) {
2710 2711 2712 2713 2714
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
L
Li Xi 已提交
2715 2716 2717 2718 2719 2720
	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;
	}
2721
#endif  /* CONFIG_QUOTA */
2722 2723 2724
	return 1;
}

2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738
/*
 * 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)
2739 2740
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2741 2742
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2743
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2744 2745 2746 2747 2748
		       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)
2749
			printk(KERN_CONT ": inode %u",
2750 2751
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
2752
			printk(KERN_CONT ": block %llu", (unsigned long long)
2753
			       le64_to_cpu(es->s_first_error_block));
2754
		printk(KERN_CONT "\n");
2755 2756
	}
	if (es->s_last_error_time) {
2757
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2758 2759 2760 2761 2762
		       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)
2763
			printk(KERN_CONT ": inode %u",
2764 2765
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
2766
			printk(KERN_CONT ": block %llu", (unsigned long long)
2767
			       le64_to_cpu(es->s_last_error_block));
2768
		printk(KERN_CONT "\n");
2769 2770 2771 2772
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t group, ngroups;
	struct super_block *sb;
	unsigned long timeout = 0;
	int ret = 0;

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

	for (group = elr->lr_next_group; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp) {
			ret = 1;
			break;
		}

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

2796
	if (group >= ngroups)
2797 2798 2799 2800 2801 2802 2803
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2804 2805
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2816
 * request structure. Should be called with li_list_mtx held
2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833
 */
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)
{
2834 2835 2836
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2837
		return;
2838
	}
2839 2840

	mutex_lock(&ext4_li_info->li_list_mtx);
2841
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2842
	mutex_unlock(&ext4_li_info->li_list_mtx);
2843
	mutex_unlock(&ext4_li_mtx);
2844 2845
}

2846 2847
static struct task_struct *ext4_lazyinit_task;

2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861
/*
 * 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;
2862
	unsigned long next_wakeup, cur;
2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875

	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) {
2876 2877
			int err = 0;
			int progress = 0;
2878 2879 2880
			elr = list_entry(pos, struct ext4_li_request,
					 lr_request);

2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
			if (time_before(jiffies, elr->lr_next_sched)) {
				if (time_before(elr->lr_next_sched, next_wakeup))
					next_wakeup = elr->lr_next_sched;
				continue;
			}
			if (down_read_trylock(&elr->lr_super->s_umount)) {
				if (sb_start_write_trylock(elr->lr_super)) {
					progress = 1;
					/*
					 * We hold sb->s_umount, sb can not
					 * be removed from the list, it is
					 * now safe to drop li_list_mtx
					 */
					mutex_unlock(&eli->li_list_mtx);
					err = ext4_run_li_request(elr);
					sb_end_write(elr->lr_super);
					mutex_lock(&eli->li_list_mtx);
					n = pos->next;
2899
				}
2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
				up_read((&elr->lr_super->s_umount));
			}
			/* error, remove the lazy_init job */
			if (err) {
				ext4_remove_li_request(elr);
				continue;
			}
			if (!progress) {
				elr->lr_next_sched = jiffies +
					(prandom_u32()
					 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
2911 2912 2913 2914 2915 2916
			}
			if (time_before(elr->lr_next_sched, next_wakeup))
				next_wakeup = elr->lr_next_sched;
		}
		mutex_unlock(&eli->li_list_mtx);

2917
		try_to_freeze();
2918

2919 2920
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2921
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2922 2923 2924 2925
			cond_resched();
			continue;
		}

2926 2927
		schedule_timeout_interruptible(next_wakeup - cur);

2928 2929 2930 2931
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
	}

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)
{
2974 2975 2976 2977
	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);
2978 2979 2980
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2981
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
				 "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.
	 */
3050 3051
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3052 3053 3054
	return elr;
}

3055 3056
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3057 3058
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3059
	struct ext4_li_request *elr = NULL;
3060
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3061
	int ret = 0;
3062

3063
	mutex_lock(&ext4_li_mtx);
3064 3065 3066 3067 3068 3069
	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;
3070
		goto out;
3071
	}
3072 3073 3074

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3075
	    !test_opt(sb, INIT_INODE_TABLE))
3076
		goto out;
3077 3078

	elr = ext4_li_request_new(sb, first_not_zeroed);
3079 3080 3081 3082
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094

	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;
3095 3096 3097 3098 3099 3100
	/*
	 * 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;
3101 3102 3103 3104 3105 3106 3107

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3108 3109
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123
		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.
	 */
3124
	if (!ext4_li_info || !ext4_lazyinit_task)
3125 3126
		return;

3127
	kthread_stop(ext4_lazyinit_task);
3128 3129
}

3130 3131 3132 3133 3134 3135
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);

3136
	if (ext4_has_metadata_csum(sb)) {
3137
		/* journal checksum v3 */
3138
		compat = 0;
3139
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3140 3141 3142 3143 3144 3145
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

3146 3147 3148 3149
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161
	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 {
3162 3163
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3164 3165 3166 3167 3168
	}

	return ret;
}

3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192
/*
 * 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;

3193
	if (!ext4_has_feature_bigalloc(sb))
3194 3195 3196
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
	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++;
		}
3226 3227 3228 3229 3230
		j = ext4_bg_num_gdb(sb, grp);
		if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
			ext4_error(sb, "Invalid number of block group "
				   "descriptor blocks: %d", j);
			j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3231
		}
3232 3233 3234
		count += j;
		for (; j > 0; j--)
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248
	}
	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;
3249 3250
	struct inode *j_inode;
	unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3251 3252
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
3253
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280

	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();
	}
3281 3282 3283 3284 3285

	/*
	 * Add the internal journal blocks whether the journal has been
	 * loaded or not
	 */
3286
	if (sbi->s_journal && !sbi->journal_bdev)
3287
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3288 3289 3290 3291 3292 3293 3294 3295 3296 3297
	else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
		j_inode = ext4_get_journal_inode(sb, j_inum);
		if (j_inode) {
			j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
			overhead += EXT4_NUM_B2C(sbi, j_blocks);
			iput(j_inode);
		} else {
			ext4_msg(sb, KERN_ERR, "can't get journal size");
		}
	}
3298 3299 3300 3301 3302 3303
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3304
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3305 3306
{
	ext4_fsblk_t resv_clusters;
3307
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3308

3309 3310 3311 3312 3313 3314
	/*
	 * 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.
	 */
3315
	if (!ext4_has_feature_extents(sb))
3316
		return;
L
Lukas Czerner 已提交
3317 3318 3319 3320
	/*
	 * 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
3321
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3322 3323 3324
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3325 3326
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3327 3328 3329 3330

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

3331
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3332 3333
}

3334
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3335
{
3336
	char *orig_data = kstrdup(data, GFP_KERNEL);
3337
	struct buffer_head *bh;
3338
	struct ext4_super_block *es = NULL;
3339
	struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3340 3341
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3342
	ext4_fsblk_t logical_sb_block;
3343 3344 3345 3346
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3347
	const char *descr;
3348
	int ret = -ENOMEM;
3349
	int blocksize, clustersize;
3350 3351
	unsigned int db_count;
	unsigned int i;
3352
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3353
	__u64 blocks_count;
3354
	int err = 0;
3355
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3356
	ext4_group_t first_not_zeroed;
3357

3358 3359
	if ((data && !orig_data) || !sbi)
		goto out_free_base;
3360 3361 3362

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3363 3364 3365
	if (!sbi->s_blockgroup_lock)
		goto out_free_base;

3366
	sb->s_fs_info = sbi;
3367
	sbi->s_sb = sb;
3368
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3369
	sbi->s_sb_block = sb_block;
3370 3371 3372
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3373

3374
	/* Cleanup superblock name */
3375
	strreplace(sb->s_id, '/', '!');
3376

3377
	/* -EINVAL is default */
3378
	ret = -EINVAL;
3379
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3380
	if (!blocksize) {
3381
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3382 3383 3384 3385
		goto out_fail;
	}

	/*
3386
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3387 3388
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3389
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3390 3391
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3392
	} else {
3393
		logical_sb_block = sb_block;
3394 3395
	}

3396
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3397
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3398 3399 3400 3401
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3402
	 *       some ext4 macro-instructions depend on its value
3403
	 */
3404
	es = (struct ext4_super_block *) (bh->b_data + offset);
3405 3406
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3407 3408
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3409
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3410

3411
	/* Warn if metadata_csum and gdt_csum are both set. */
3412 3413
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3414
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3415 3416
			     "redundant flags; please run fsck.");

3417 3418 3419 3420 3421 3422 3423 3424
	/* 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;
	}

3425
	/* Load the checksum driver */
3426
	if (ext4_has_feature_metadata_csum(sb)) {
3427 3428 3429 3430 3431 3432 3433 3434 3435
		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;
		}
	}

3436 3437 3438 3439 3440
	/* 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;
3441
		ret = -EFSBADCRC;
3442 3443 3444 3445
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3446
	if (ext4_has_feature_csum_seed(sb))
3447 3448
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3449 3450 3451
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3452 3453
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3454
	set_opt(sb, INIT_INODE_TABLE);
3455
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3456
		set_opt(sb, DEBUG);
3457
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3458
		set_opt(sb, GRPID);
3459
	if (def_mount_opts & EXT4_DEFM_UID16)
3460
		set_opt(sb, NO_UID32);
3461 3462
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3463
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3464
	set_opt(sb, POSIX_ACL);
3465
#endif
3466 3467 3468 3469
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3470
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3471
		set_opt(sb, JOURNAL_DATA);
3472
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3473
		set_opt(sb, ORDERED_DATA);
3474
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3475
		set_opt(sb, WRITEBACK_DATA);
3476 3477

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3478
		set_opt(sb, ERRORS_PANIC);
3479
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3480
		set_opt(sb, ERRORS_CONT);
3481
	else
3482
		set_opt(sb, ERRORS_RO);
3483 3484
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3485
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3486
		set_opt(sb, DISCARD);
3487

3488 3489
	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));
3490 3491 3492
	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;
3493

3494
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3495
		set_opt(sb, BARRIER);
3496

3497 3498 3499 3500
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3501
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3502
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3503
		set_opt(sb, DELALLOC);
3504

3505 3506 3507 3508 3509 3510
	/*
	 * 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;

3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523
	if (sbi->s_es->s_mount_opts[0]) {
		char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
					      sizeof(sbi->s_es->s_mount_opts),
					      GFP_KERNEL);
		if (!s_mount_opts)
			goto failed_mount;
		if (!parse_options(s_mount_opts, sb, &journal_devnum,
				   &journal_ioprio, 0)) {
			ext4_msg(sb, KERN_WARNING,
				 "failed to parse options in superblock: %s",
				 s_mount_opts);
		}
		kfree(s_mount_opts);
3524
	}
3525
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3526
	if (!parse_options((char *) data, sb, &journal_devnum,
3527
			   &journal_ioprio, 0))
3528 3529
		goto failed_mount;

3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540
	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 "
3541
				 "both data=journal and dioread_nolock");
3542 3543
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3544 3545 3546 3547 3548
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3549 3550 3551 3552 3553
		if (ext4_has_feature_encrypt(sb)) {
			ext4_msg(sb, KERN_WARNING,
				 "encrypted files will use data=ordered "
				 "instead of data journaling mode");
		}
3554 3555
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3556 3557
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3558 3559
	}

3560
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3561
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3562

3563
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3564 3565 3566
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3567 3568 3569
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3570

3571 3572
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3573
		if (ext4_has_feature_64bit(sb)) {
3574 3575 3576 3577 3578 3579
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601
	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;
		}
	}

3602 3603 3604 3605 3606
	/*
	 * 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.
	 */
3607
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3608
		goto failed_mount;
3609

J
Jan Kara 已提交
3610
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3611 3612
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3613
		ext4_msg(sb, KERN_ERR,
3614 3615 3616 3617 3618 3619 3620 3621 3622
		       "Unsupported filesystem blocksize %d (%d log_block_size)",
			 blocksize, le32_to_cpu(es->s_log_block_size));
		goto failed_mount;
	}
	if (le32_to_cpu(es->s_log_block_size) >
	    (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Invalid log block size: %u",
			 le32_to_cpu(es->s_log_block_size));
3623 3624 3625
		goto failed_mount;
	}

3626 3627 3628 3629 3630 3631 3632
	if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
		ext4_msg(sb, KERN_ERR,
			 "Number of reserved GDT blocks insanely large: %d",
			 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
		goto failed_mount;
	}

R
Ross Zwisler 已提交
3633
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3634 3635
		err = bdev_dax_supported(sb, blocksize);
		if (err)
R
Ross Zwisler 已提交
3636 3637 3638
			goto failed_mount;
	}

3639
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3640 3641 3642 3643 3644
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3645
	if (sb->s_blocksize != blocksize) {
3646 3647
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3648
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3649
					blocksize);
3650 3651 3652
			goto failed_mount;
		}

3653
		brelse(bh);
3654 3655
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3656
		bh = sb_bread_unmovable(sb, logical_sb_block);
3657
		if (!bh) {
3658 3659
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3660 3661
			goto failed_mount;
		}
3662
		es = (struct ext4_super_block *)(bh->b_data + offset);
3663
		sbi->s_es = es;
3664
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3665 3666
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3667 3668 3669 3670
			goto failed_mount;
		}
	}

3671
	has_huge_files = ext4_has_feature_huge_file(sb);
3672 3673 3674
	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);
3675

3676 3677 3678
	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;
3679 3680 3681
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3682
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3683
		    (!is_power_of_2(sbi->s_inode_size)) ||
3684
		    (sbi->s_inode_size > blocksize)) {
3685 3686
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3687
			       sbi->s_inode_size);
3688 3689
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3690 3691
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3692
	}
3693

3694
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3695
	if (ext4_has_feature_64bit(sb)) {
3696
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3697
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3698
		    !is_power_of_2(sbi->s_desc_size)) {
3699 3700
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3701 3702 3703 3704 3705
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3706

3707 3708
	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);
3709

3710
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3711
	if (sbi->s_inodes_per_block == 0)
3712
		goto cantfind_ext4;
3713 3714 3715 3716 3717 3718
	if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
	    sbi->s_inodes_per_group > blocksize * 8) {
		ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
			 sbi->s_blocks_per_group);
		goto failed_mount;
	}
3719 3720
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3721
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3722 3723
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3724 3725
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3726

3727
	for (i = 0; i < 4; i++)
3728 3729
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3730
	if (ext4_has_feature_dir_index(sb)) {
3731 3732 3733 3734
		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) {
3735
#ifdef __CHAR_UNSIGNED__
3736 3737 3738 3739
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3740
#else
3741 3742 3743
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3744
#endif
3745
		}
3746
	}
3747

3748 3749
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3750
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3751 3752 3753 3754 3755 3756 3757
	if (has_bigalloc) {
		if (clustersize < blocksize) {
			ext4_msg(sb, KERN_ERR,
				 "cluster size (%d) smaller than "
				 "block size (%d)", clustersize, blocksize);
			goto failed_mount;
		}
3758 3759 3760 3761 3762 3763 3764
		if (le32_to_cpu(es->s_log_cluster_size) >
		    (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
			ext4_msg(sb, KERN_ERR,
				 "Invalid log cluster size: %u",
				 le32_to_cpu(es->s_log_cluster_size));
			goto failed_mount;
		}
3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
		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;
3798
	}
3799 3800
	sbi->s_cluster_ratio = clustersize / blocksize;

3801 3802 3803 3804
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3805 3806 3807 3808
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3809
	err = generic_check_addressable(sb->s_blocksize_bits,
3810
					ext4_blocks_count(es));
3811
	if (err) {
3812
		ext4_msg(sb, KERN_ERR, "filesystem"
3813
			 " too large to mount safely on this system");
3814
		if (sizeof(sector_t) < 8)
3815
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3816 3817 3818
		goto failed_mount;
	}

3819 3820
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3821

3822 3823 3824
	/* 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) {
3825 3826
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3827 3828 3829 3830
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3831 3832 3833 3834 3835
	/*
	 * 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)) {
3836
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3837 3838 3839
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3840 3841
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3842 3843 3844 3845
	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));
3846
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3847
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3848
		       "(block count %llu, first data block %u, "
3849
		       "blocks per group %lu)", sbi->s_groups_count,
3850 3851 3852 3853 3854
		       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
3855
	sbi->s_groups_count = blocks_count;
3856 3857
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3858 3859
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3860
	if (ext4_has_feature_meta_bg(sb)) {
3861
		if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3862 3863 3864 3865 3866 3867 3868
			ext4_msg(sb, KERN_WARNING,
				 "first meta block group too large: %u "
				 "(group descriptor block count %u)",
				 le32_to_cpu(es->s_first_meta_bg), db_count);
			goto failed_mount;
		}
	}
3869 3870 3871
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3872
	if (sbi->s_group_desc == NULL) {
3873
		ext4_msg(sb, KERN_ERR, "not enough memory");
3874
		ret = -ENOMEM;
3875 3876 3877
		goto failed_mount;
	}

3878
	bgl_lock_init(sbi->s_blockgroup_lock);
3879 3880

	for (i = 0; i < db_count; i++) {
3881
		block = descriptor_loc(sb, logical_sb_block, i);
3882
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3883
		if (!sbi->s_group_desc[i]) {
3884 3885
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3886 3887 3888 3889
			db_count = i;
			goto failed_mount2;
		}
	}
3890
	if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
3891
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3892
		ret = -EFSCORRUPTED;
3893
		goto failed_mount2;
3894
	}
3895

3896
	sbi->s_gdb_count = db_count;
3897 3898 3899
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3900 3901
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3902

3903
	/* Register extent status tree shrinker */
3904
	if (ext4_es_register_shrinker(sbi))
3905 3906
		goto failed_mount3;

3907
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3908
	sbi->s_extent_max_zeroout_kb = 32;
3909

3910 3911 3912
	/*
	 * set up enough so that it can read an inode
	 */
3913
	sb->s_op = &ext4_sops;
3914 3915
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3916
	sb->s_cop = &ext4_cryptops;
3917
#ifdef CONFIG_QUOTA
3918
	sb->dq_op = &ext4_quota_operations;
3919
	if (ext4_has_feature_quota(sb))
3920
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3921 3922
	else
		sb->s_qcop = &ext4_qctl_operations;
L
Li Xi 已提交
3923
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
3924
#endif
3925 3926
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3927
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3928
	mutex_init(&sbi->s_orphan_lock);
3929 3930 3931 3932

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3933
			  ext4_has_feature_journal_needs_recovery(sb));
3934

3935
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3936
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3937
			goto failed_mount3a;
3938

3939 3940 3941 3942
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3943
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3944 3945
		err = ext4_load_journal(sb, es, journal_devnum);
		if (err)
3946
			goto failed_mount3a;
3947
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3948
		   ext4_has_feature_journal_needs_recovery(sb)) {
3949 3950
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3951
		goto failed_mount_wq;
3952
	} else {
3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977
		/* 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);
3978
		clear_opt(sb, DATA_FLAGS);
3979 3980 3981
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3982 3983
	}

3984
	if (ext4_has_feature_64bit(sb) &&
3985 3986
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3987
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3988
		goto failed_mount_wq;
3989 3990
	}

3991 3992 3993 3994
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3995
	}
3996

3997 3998 3999 4000 4001
	/* 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
4002 4003 4004
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
4005 4006
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4007
			set_opt(sb, ORDERED_DATA);
4008
		else
4009
			set_opt(sb, JOURNAL_DATA);
4010 4011
		break;

4012 4013
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
4014 4015
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4016 4017
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
4018
			goto failed_mount_wq;
4019 4020 4021 4022
		}
	default:
		break;
	}
4023 4024 4025 4026 4027 4028 4029 4030

	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");
		goto failed_mount_wq;
	}

4031
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4032

B
Bobi Jam 已提交
4033 4034
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4035
no_journal:
4036 4037 4038 4039
	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;
4040 4041
	}

4042
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4043
	    (blocksize != PAGE_SIZE)) {
4044 4045 4046 4047 4048
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

4049 4050 4051
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
4052 4053 4054
		ext4_commit_super(sb, 1);
	}

4055 4056 4057 4058 4059 4060 4061
	/*
	 * 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 {
4062 4063
		err = ext4_calculate_overhead(sb);
		if (err)
4064 4065 4066
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4067 4068 4069 4070
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4071 4072 4073 4074
	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");
4075
		ret = -ENOMEM;
4076 4077 4078
		goto failed_mount4;
	}

4079
	/*
4080
	 * The jbd2_journal_load will have done any necessary log recovery,
4081 4082 4083
	 * so we can safely mount the rest of the filesystem now.
	 */

4084 4085
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4086
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4087
		ret = PTR_ERR(root);
4088
		root = NULL;
4089 4090 4091
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4092
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4093
		iput(root);
4094 4095
		goto failed_mount4;
	}
4096
	sb->s_root = d_make_root(root);
4097
	if (!sb->s_root) {
4098
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4099 4100 4101
		ret = -ENOMEM;
		goto failed_mount4;
	}
4102

4103 4104
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4105 4106

	/* determine the minimum size of new large inodes, if present */
4107 4108
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
	    sbi->s_want_extra_isize == 0) {
K
Kalpak Shah 已提交
4109 4110
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
4111
		if (ext4_has_feature_extra_isize(sb)) {
K
Kalpak Shah 已提交
4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126
			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;
4127 4128
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4129 4130
	}

4131
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
4132

4133 4134
	err = ext4_setup_system_zone(sb);
	if (err) {
4135
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4136
			 "zone (%d)", err);
4137 4138 4139 4140 4141 4142 4143 4144
		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);
4145
		goto failed_mount5;
4146 4147
	}

4148 4149 4150
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
4151 4152
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
4153 4154 4155
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4156 4157
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
4158 4159 4160
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
4161
					  ext4_count_dirs(sb), GFP_KERNEL);
4162
	if (!err)
4163 4164
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
4165 4166 4167
	if (!err)
		err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);

4168 4169 4170 4171 4172
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

4173
	if (ext4_has_feature_flex_bg(sb))
4174 4175 4176 4177 4178 4179 4180
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

4181 4182
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4183
		goto failed_mount6;
4184

4185
	err = ext4_register_sysfs(sb);
4186 4187
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4188

4189 4190
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
4191
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
4192 4193 4194 4195 4196 4197
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

4198 4199 4200
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4201
	if (needs_recovery) {
4202
		ext4_msg(sb, KERN_INFO, "recovery complete");
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214
		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";

4215 4216 4217 4218 4219 4220 4221 4222
	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");
	}

4223 4224
	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
		ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4225 4226 4227
			 "Opts: %.*s%s%s", descr,
			 (int) sizeof(sbi->s_es->s_mount_opts),
			 sbi->s_es->s_mount_opts,
4228
			 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4229

4230 4231
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4232

4233 4234 4235 4236 4237
	/* 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);

4238
	kfree(orig_data);
4239 4240
	return 0;

4241
cantfind_ext4:
4242
	if (!silent)
4243
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4244 4245
	goto failed_mount;

4246 4247
#ifdef CONFIG_QUOTA
failed_mount8:
4248
	ext4_unregister_sysfs(sb);
4249
#endif
4250 4251 4252
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4253
	ext4_mb_release(sb);
4254
	if (sbi->s_flex_groups)
A
Al Viro 已提交
4255
		kvfree(sbi->s_flex_groups);
4256 4257 4258 4259
	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);
4260
failed_mount5:
4261 4262 4263
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4264
	dput(sb->s_root);
4265
	sb->s_root = NULL;
A
Al Viro 已提交
4266
failed_mount4:
4267
	ext4_msg(sb, KERN_ERR, "mount failed");
4268 4269
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4270
failed_mount_wq:
J
Jan Kara 已提交
4271 4272 4273 4274
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
4275 4276 4277 4278
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4279
failed_mount3a:
4280
	ext4_es_unregister_shrinker(sbi);
4281
failed_mount3:
4282
	del_timer_sync(&sbi->s_err_report);
4283 4284
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4285 4286 4287
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
4288
	kvfree(sbi->s_group_desc);
4289
failed_mount:
4290 4291
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4292
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4293
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4294 4295
		kfree(sbi->s_qf_names[i]);
#endif
4296
	ext4_blkdev_remove(sbi);
4297 4298 4299
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4300
	kfree(sbi->s_blockgroup_lock);
4301
out_free_base:
4302
	kfree(sbi);
4303
	kfree(orig_data);
4304
	return err ? err : ret;
4305 4306 4307 4308 4309 4310 4311
}

/*
 * 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.
 */
4312
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4313
{
4314
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4315

4316 4317 4318
	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;
4319

4320
	write_lock(&journal->j_state_lock);
4321
	if (test_opt(sb, BARRIER))
4322
		journal->j_flags |= JBD2_BARRIER;
4323
	else
4324
		journal->j_flags &= ~JBD2_BARRIER;
4325 4326 4327 4328
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4329
	write_unlock(&journal->j_state_lock);
4330 4331
}

4332 4333
static struct inode *ext4_get_journal_inode(struct super_block *sb,
					     unsigned int journal_inum)
4334 4335 4336
{
	struct inode *journal_inode;

4337 4338 4339 4340 4341
	/*
	 * 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.
	 */
4342 4343
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4344
		ext4_msg(sb, KERN_ERR, "no journal found");
4345 4346 4347 4348 4349
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4350
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4351 4352 4353
		return NULL;
	}

4354
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4355
		  journal_inode, journal_inode->i_size);
4356
	if (!S_ISREG(journal_inode->i_mode)) {
4357
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4358 4359 4360
		iput(journal_inode);
		return NULL;
	}
4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374
	return journal_inode;
}

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

	BUG_ON(!ext4_has_feature_journal(sb));

	journal_inode = ext4_get_journal_inode(sb, journal_inum);
	if (!journal_inode)
		return NULL;
4375

4376
	journal = jbd2_journal_init_inode(journal_inode);
4377
	if (!journal) {
4378
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4379 4380 4381 4382
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4383
	ext4_init_journal_params(sb, journal);
4384 4385 4386
	return journal;
}

4387
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4388 4389
				       dev_t j_dev)
{
4390
	struct buffer_head *bh;
4391
	journal_t *journal;
4392 4393
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4394
	int hblock, blocksize;
4395
	ext4_fsblk_t sb_block;
4396
	unsigned long offset;
4397
	struct ext4_super_block *es;
4398 4399
	struct block_device *bdev;

4400
	BUG_ON(!ext4_has_feature_journal(sb));
4401

4402
	bdev = ext4_blkdev_get(j_dev, sb);
4403 4404 4405 4406
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4407
	hblock = bdev_logical_block_size(bdev);
4408
	if (blocksize < hblock) {
4409 4410
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4411 4412 4413
		goto out_bdev;
	}

4414 4415
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4416 4417
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4418 4419
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4420 4421 4422
		goto out_bdev;
	}

4423
	es = (struct ext4_super_block *) (bh->b_data + offset);
4424
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4425
	    !(le32_to_cpu(es->s_feature_incompat) &
4426
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4427 4428
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4429 4430 4431 4432
		brelse(bh);
		goto out_bdev;
	}

4433 4434 4435 4436 4437 4438 4439 4440 4441
	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;
	}

4442
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4443
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4444 4445 4446 4447
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4448
	len = ext4_blocks_count(es);
4449 4450 4451
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4452
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4453 4454
					start, len, blocksize);
	if (!journal) {
4455
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4456 4457 4458
		goto out_bdev;
	}
	journal->j_private = sb;
4459
	ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4460 4461
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4462
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4463 4464 4465
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4466 4467
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4468 4469 4470
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4471 4472
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4473
	return journal;
4474

4475
out_journal:
4476
	jbd2_journal_destroy(journal);
4477
out_bdev:
4478
	ext4_blkdev_put(bdev);
4479 4480 4481
	return NULL;
}

4482 4483
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4484 4485 4486 4487 4488 4489 4490 4491
			     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;

4492
	BUG_ON(!ext4_has_feature_journal(sb));
4493

4494 4495
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4496 4497
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508
		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.
	 */
4509
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4510
		if (sb->s_flags & MS_RDONLY) {
4511 4512
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4513
			if (really_read_only) {
4514 4515
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4516 4517
				return -EROFS;
			}
4518 4519
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4520 4521 4522 4523
		}
	}

	if (journal_inum && journal_dev) {
4524 4525
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4526 4527 4528 4529
		return -EINVAL;
	}

	if (journal_inum) {
4530
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4531 4532
			return -EINVAL;
	} else {
4533
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4534 4535 4536
			return -EINVAL;
	}

4537
	if (!(journal->j_flags & JBD2_BARRIER))
4538
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4539

4540
	if (!ext4_has_feature_journal_needs_recovery(sb))
4541
		err = jbd2_journal_wipe(journal, !really_read_only);
4542 4543 4544 4545 4546
	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);
4547
		err = jbd2_journal_load(journal);
4548 4549 4550 4551 4552
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4553 4554

	if (err) {
4555
		ext4_msg(sb, KERN_ERR, "error loading journal");
4556
		jbd2_journal_destroy(journal);
4557 4558 4559
		return err;
	}

4560 4561
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4562

4563
	if (!really_read_only && journal_devnum &&
4564 4565 4566 4567
	    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. */
4568
		ext4_commit_super(sb, 1);
4569 4570 4571 4572 4573
	}

	return 0;
}

4574
static int ext4_commit_super(struct super_block *sb, int sync)
4575
{
4576
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4577
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4578
	int error = 0;
4579

4580
	if (!sbh || block_device_ejected(sb))
4581
		return error;
4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592 4593
	/*
	 * 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());
4594 4595 4596
	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
4597 4598
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4599 4600 4601
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4602 4603
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4604 4605
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4606 4607 4608
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4609
				&EXT4_SB(sb)->s_freeinodes_counter));
4610
	BUFFER_TRACE(sbh, "marking dirty");
4611
	ext4_superblock_csum_set(sb);
4612 4613
	if (sync)
		lock_buffer(sbh);
4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627
	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4628
	mark_buffer_dirty(sbh);
4629
	if (sync) {
4630
		unlock_buffer(sbh);
4631
		error = __sync_dirty_buffer(sbh,
4632
			test_opt(sb, BARRIER) ? REQ_FUA : REQ_SYNC);
4633 4634 4635 4636 4637
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4638 4639
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4640 4641 4642 4643
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4644
	return error;
4645 4646 4647 4648 4649 4650 4651
}

/*
 * 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.
 */
4652 4653
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4654
{
4655
	journal_t *journal = EXT4_SB(sb)->s_journal;
4656

4657
	if (!ext4_has_feature_journal(sb)) {
4658 4659 4660
		BUG_ON(journal != NULL);
		return;
	}
4661
	jbd2_journal_lock_updates(journal);
4662 4663 4664
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4665
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4666
	    sb->s_flags & MS_RDONLY) {
4667
		ext4_clear_feature_journal_needs_recovery(sb);
4668
		ext4_commit_super(sb, 1);
4669
	}
4670 4671

out:
4672
	jbd2_journal_unlock_updates(journal);
4673 4674 4675 4676 4677 4678 4679
}

/*
 * 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.
 */
4680 4681
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4682 4683 4684 4685 4686
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4687
	BUG_ON(!ext4_has_feature_journal(sb));
4688

4689
	journal = EXT4_SB(sb)->s_journal;
4690 4691 4692

	/*
	 * Now check for any error status which may have been recorded in the
4693
	 * journal by a prior ext4_error() or ext4_abort()
4694 4695
	 */

4696
	j_errno = jbd2_journal_errno(journal);
4697 4698 4699
	if (j_errno) {
		char nbuf[16];

4700
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4701
		ext4_warning(sb, "Filesystem error recorded "
4702
			     "from previous mount: %s", errstr);
4703
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4704

4705 4706
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4707
		ext4_commit_super(sb, 1);
4708

4709
		jbd2_journal_clear_err(journal);
4710
		jbd2_journal_update_sb_errno(journal);
4711 4712 4713 4714 4715 4716 4717
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4718
int ext4_force_commit(struct super_block *sb)
4719 4720 4721 4722 4723 4724
{
	journal_t *journal;

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

4725
	journal = EXT4_SB(sb)->s_journal;
4726
	return ext4_journal_force_commit(journal);
4727 4728
}

4729
static int ext4_sync_fs(struct super_block *sb, int wait)
4730
{
4731
	int ret = 0;
4732
	tid_t target;
4733
	bool needs_barrier = false;
4734
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4735

4736 4737 4738
	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
		return 0;

4739
	trace_ext4_sync_fs(sb, wait);
4740
	flush_workqueue(sbi->rsv_conversion_wq);
4741 4742 4743 4744 4745
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4746 4747 4748 4749 4750
	/*
	 * 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.
	 */
4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762
	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))
4763 4764 4765 4766 4767 4768
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4769
	}
4770 4771 4772 4773

	return ret;
}

4774 4775 4776
/*
 * 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.
4777 4778
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4779 4780
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4781
 */
4782
static int ext4_freeze(struct super_block *sb)
4783
{
4784 4785
	int error = 0;
	journal_t *journal;
4786

4787 4788
	if (sb->s_flags & MS_RDONLY)
		return 0;
4789

4790
	journal = EXT4_SB(sb)->s_journal;
4791

4792 4793 4794
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4795

4796 4797 4798 4799 4800 4801 4802
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4803 4804

		/* Journal blocked and flushed, clear needs_recovery flag. */
4805
		ext4_clear_feature_journal_needs_recovery(sb);
4806
	}
4807 4808

	error = ext4_commit_super(sb, 1);
4809
out:
4810 4811 4812
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4813
	return error;
4814 4815 4816 4817 4818 4819
}

/*
 * 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.
 */
4820
static int ext4_unfreeze(struct super_block *sb)
4821
{
4822
	if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb)))
4823 4824
		return 0;

4825 4826
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4827
		ext4_set_feature_journal_needs_recovery(sb);
4828 4829
	}

4830
	ext4_commit_super(sb, 1);
4831
	return 0;
4832 4833
}

4834 4835 4836 4837 4838
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4839
	unsigned long s_mount_opt2;
4840 4841
	kuid_t s_resuid;
	kgid_t s_resgid;
4842 4843 4844 4845
	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
4846
	char *s_qf_names[EXT4_MAXQUOTAS];
4847 4848 4849
#endif
};

4850
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4851
{
4852
	struct ext4_super_block *es;
4853
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4854
	unsigned long old_sb_flags;
4855
	struct ext4_mount_options old_opts;
4856
	int enable_quota = 0;
4857
	ext4_group_t g;
4858
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4859
	int err = 0;
4860
#ifdef CONFIG_QUOTA
4861
	int i, j;
4862
#endif
4863
	char *orig_data = kstrdup(data, GFP_KERNEL);
4864 4865 4866 4867

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4868
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4869 4870 4871
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4872 4873
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4874 4875
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4876
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4877 4878 4879 4880 4881 4882
		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]);
4883
				kfree(orig_data);
4884 4885 4886 4887
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4888
#endif
4889 4890
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4891

4892
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4893 4894 4895 4896
		err = -EINVAL;
		goto restore_opts;
	}

4897
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4898 4899
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4900 4901
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4902 4903
	}

4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916
	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
4917 4918 4919 4920 4921 4922
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			err = -EINVAL;
			goto restore_opts;
		}
4923 4924 4925 4926 4927 4928 4929
	} else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
		if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				"journal_async_commit in data=ordered mode");
			err = -EINVAL;
			goto restore_opts;
		}
R
Ross Zwisler 已提交
4930 4931 4932 4933 4934 4935
	}

	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;
4936 4937
	}

4938
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4939
		ext4_abort(sb, "Abort forced by user");
4940 4941

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4942
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4943 4944 4945

	es = sbi->s_es;

4946
	if (sbi->s_journal) {
4947
		ext4_init_journal_params(sb, sbi->s_journal);
4948 4949
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4950

4951 4952 4953
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4954
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4955
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4956 4957 4958 4959 4960
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4961 4962 4963
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4964 4965
			err = dquot_suspend(sb, -1);
			if (err < 0)
4966 4967
				goto restore_opts;

4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978
			/*
			 * 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.
			 */
4979 4980
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4981 4982
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4983
			if (sbi->s_journal)
4984
				ext4_mark_recovery_complete(sb, es);
4985
		} else {
4986
			/* Make sure we can mount this feature set readwrite */
4987
			if (ext4_has_feature_readonly(sb) ||
D
Darrick J. Wong 已提交
4988
			    !ext4_feature_set_ok(sb, 0)) {
4989 4990 4991
				err = -EROFS;
				goto restore_opts;
			}
4992 4993
			/*
			 * Make sure the group descriptor checksums
4994
			 * are sane.  If they aren't, refuse to remount r/w.
4995 4996 4997 4998 4999
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

5000
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5001 5002
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
5003
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5004
					       le16_to_cpu(gdp->bg_checksum));
5005
					err = -EFSBADCRC;
5006 5007 5008 5009
					goto restore_opts;
				}
			}

5010 5011 5012 5013 5014 5015
			/*
			 * 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) {
5016
				ext4_msg(sb, KERN_WARNING, "Couldn't "
5017 5018
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
5019
				       "umount/remount instead");
5020 5021 5022 5023
				err = -EINVAL;
				goto restore_opts;
			}

5024 5025 5026 5027 5028 5029
			/*
			 * 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.)
			 */
5030 5031
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
5032
			sbi->s_mount_state = le16_to_cpu(es->s_state);
5033
			if (!ext4_setup_super(sb, es, 0))
5034
				sb->s_flags &= ~MS_RDONLY;
5035
			if (ext4_has_feature_mmp(sb))
5036 5037 5038 5039 5040
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
5041
			enable_quota = 1;
5042 5043
		}
	}
5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056

	/*
	 * 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);
	}

5057
	ext4_setup_system_zone(sb);
5058
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
5059
		ext4_commit_super(sb, 1);
5060

5061 5062
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
5063
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
5064
		kfree(old_opts.s_qf_names[i]);
5065 5066 5067
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
5068
		else if (ext4_has_feature_quota(sb)) {
5069
			err = ext4_enable_quotas(sb);
5070
			if (err)
5071 5072 5073
				goto restore_opts;
		}
	}
5074
#endif
5075

5076
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
5077 5078
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
5079
	return 0;
5080

5081 5082 5083
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
5084
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5085 5086 5087
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
5088 5089
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
5090 5091
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
5092
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5093
		kfree(sbi->s_qf_names[i]);
5094 5095 5096
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5097
	kfree(orig_data);
5098 5099 5100
	return err;
}

L
Li Xi 已提交
5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142
#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

5143
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5144 5145
{
	struct super_block *sb = dentry->d_sb;
5146 5147
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5148
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5149
	u64 fsid;
5150
	s64 bfree;
L
Lukas Czerner 已提交
5151
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5152

5153 5154
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5155

5156
	buf->f_type = EXT4_SUPER_MAGIC;
5157
	buf->f_bsize = sb->s_blocksize;
5158
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5159 5160
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5161
	/* prevent underflow in case that few free space is available */
5162
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5163 5164 5165
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5166 5167
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5168
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5169
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5170 5171 5172 5173
	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;
5174

L
Li Xi 已提交
5175 5176 5177 5178 5179
#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
5180 5181 5182
	return 0;
}

5183 5184
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5185
 * Process 1                         Process 2
5186
 * ext4_create()                     quota_sync()
5187
 *   jbd2_journal_start()                  write_dquot()
5188
 *   dquot_initialize()                         down(dqio_mutex)
5189
 *     down(dqio_mutex)                    jbd2_journal_start()
5190 5191 5192 5193 5194 5195 5196
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5197
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5198 5199
}

5200
static int ext4_write_dquot(struct dquot *dquot)
5201 5202 5203 5204 5205 5206
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5207
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5208
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5209 5210 5211
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5212
	err = ext4_journal_stop(handle);
5213 5214 5215 5216 5217
	if (!ret)
		ret = err;
	return ret;
}

5218
static int ext4_acquire_dquot(struct dquot *dquot)
5219 5220 5221 5222
{
	int ret, err;
	handle_t *handle;

5223
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5224
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5225 5226 5227
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5228
	err = ext4_journal_stop(handle);
5229 5230 5231 5232 5233
	if (!ret)
		ret = err;
	return ret;
}

5234
static int ext4_release_dquot(struct dquot *dquot)
5235 5236 5237 5238
{
	int ret, err;
	handle_t *handle;

5239
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5240
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5241 5242 5243
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5244
		return PTR_ERR(handle);
J
Jan Kara 已提交
5245
	}
5246
	ret = dquot_release(dquot);
5247
	err = ext4_journal_stop(handle);
5248 5249 5250 5251 5252
	if (!ret)
		ret = err;
	return ret;
}

5253
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5254
{
5255 5256 5257
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5258
	/* Are we journaling quotas? */
5259
	if (ext4_has_feature_quota(sb) ||
5260
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5261
		dquot_mark_dquot_dirty(dquot);
5262
		return ext4_write_dquot(dquot);
5263 5264 5265 5266 5267
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5268
static int ext4_write_info(struct super_block *sb, int type)
5269 5270 5271 5272 5273
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5274
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5275 5276 5277
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5278
	err = ext4_journal_stop(handle);
5279 5280 5281 5282 5283 5284 5285 5286 5287
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5288
static int ext4_quota_on_mount(struct super_block *sb, int type)
5289
{
5290 5291
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5292 5293
}

5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307
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);
}

5308 5309 5310
/*
 * Standard function to be called on quota_on
 */
5311
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
A
Al Viro 已提交
5312
			 const struct path *path)
5313 5314 5315 5316 5317
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5318

5319
	/* Quotafile not on the same filesystem? */
5320
	if (path->dentry->d_sb != sb)
5321
		return -EXDEV;
5322 5323
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5324
		/* Quotafile not in fs root? */
5325
		if (path->dentry->d_parent != sb->s_root)
5326 5327 5328
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5329
	}
5330 5331 5332 5333 5334

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5335
	if (EXT4_SB(sb)->s_journal &&
5336
	    ext4_should_journal_data(d_inode(path->dentry))) {
5337 5338 5339 5340 5341
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5342
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5343
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5344
		if (err)
5345
			return err;
5346
	}
5347 5348 5349 5350 5351 5352
	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;
5353 5354
}

5355 5356 5357 5358 5359
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
5360
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5361
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5362 5363
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5364 5365
	};

5366
	BUG_ON(!ext4_has_feature_quota(sb));
5367 5368 5369 5370 5371 5372 5373 5374 5375 5376

	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
5377 5378
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5379
	lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5380 5381
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);
5382 5383
	if (err)
		lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5384 5385 5386 5387 5388 5389 5390 5391

	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
5392
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5393
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
L
Li Xi 已提交
5394 5395
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5396
	};
5397 5398 5399 5400 5401
	bool quota_mopt[EXT4_MAXQUOTAS] = {
		test_opt(sb, USRQUOTA),
		test_opt(sb, GRPQUOTA),
		test_opt(sb, PRJQUOTA),
	};
5402 5403

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5404
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5405 5406
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5407 5408
				DQUOT_USAGE_ENABLED |
				(quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5409 5410
			if (err) {
				ext4_warning(sb,
5411 5412 5413
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5414 5415 5416 5417 5418 5419 5420
				return err;
			}
		}
	}
	return 0;
}

5421 5422
static int ext4_quota_off(struct super_block *sb, int type)
{
5423 5424 5425
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5426 5427 5428
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5429 5430
		sync_filesystem(sb);

5431 5432 5433
	if (!inode)
		goto out;

5434 5435
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5436
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5437 5438
	if (IS_ERR(handle))
		goto out;
5439
	inode->i_mtime = inode->i_ctime = current_time(inode);
5440 5441 5442 5443
	ext4_mark_inode_dirty(handle, inode);
	ext4_journal_stop(handle);

out:
5444 5445 5446
	return dquot_quota_off(sb, type);
}

5447 5448
/* 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
5449
 * itself serializes the operations (and no one else should touch the files)
5450
 * we don't have to be afraid of races */
5451
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5452 5453 5454
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5455
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469
	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;
5470 5471 5472
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487
		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) */
5488
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5489 5490 5491
				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
5492
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5493
	int err, offset = off & (sb->s_blocksize - 1);
5494
	int retries = 0;
5495 5496 5497
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5498
	if (EXT4_SB(sb)->s_journal && !handle) {
5499 5500
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5501 5502 5503
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514
	/*
	 * 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;
	}

5515 5516 5517 5518 5519 5520
	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));
5521 5522
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5523 5524
	if (!bh)
		goto out;
5525
	BUFFER_TRACE(bh, "get write access");
5526 5527 5528
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5529
		return err;
5530
	}
5531 5532 5533 5534
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5535
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5536
	brelse(bh);
5537
out:
5538 5539
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5540
		EXT4_I(inode)->i_disksize = inode->i_size;
5541
		ext4_mark_inode_dirty(handle, inode);
5542
	}
5543
	return len;
5544 5545
}

5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556
static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
{
	const struct quota_format_ops	*ops;

	if (!sb_has_quota_loaded(sb, qid->type))
		return -ESRCH;
	ops = sb_dqopt(sb)->ops[qid->type];
	if (!ops || !ops->get_next_id)
		return -ENOSYS;
	return dquot_get_next_id(sb, qid);
}
5557 5558
#endif

A
Al Viro 已提交
5559 5560
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5561
{
A
Al Viro 已提交
5562
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5563 5564
}

J
Jan Kara 已提交
5565
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576 5577
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);
}
5578 5579 5580

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5581
	if (ext4_has_unknown_ext2_incompat_features(sb))
5582 5583 5584
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5585
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5586 5587 5588
		return 0;
	return 1;
}
5589 5590 5591
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5592
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5593 5594 5595 5596 5597 5598 5599 5600 5601 5602 5603 5604 5605 5606
#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);
}
5607 5608 5609

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5610
	if (ext4_has_unknown_ext3_incompat_features(sb))
5611
		return 0;
5612
	if (!ext4_has_feature_journal(sb))
5613 5614 5615
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5616
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5617 5618 5619
		return 0;
	return 1;
}
5620

T
Theodore Ts'o 已提交
5621 5622 5623
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5624
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5625 5626 5627
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5628
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5629

5630 5631 5632
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];

5633
static int __init ext4_init_fs(void)
5634
{
5635
	int i, err;
5636

5637
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5638 5639 5640
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5641
	/* Build-time check for flags consistency */
5642
	ext4_check_flag_values();
5643

5644
	for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5645 5646
		init_waitqueue_head(&ext4__ioend_wq[i]);

5647
	err = ext4_init_es();
5648 5649
	if (err)
		return err;
5650 5651 5652

	err = ext4_init_pageio();
	if (err)
5653
		goto out5;
5654

5655
	err = ext4_init_system_zone();
5656
	if (err)
5657
		goto out4;
5658

5659
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5660
	if (err)
5661
		goto out3;
5662

5663
	err = ext4_init_mballoc();
5664 5665
	if (err)
		goto out2;
5666 5667 5668
	err = init_inodecache();
	if (err)
		goto out1;
5669
	register_as_ext3();
5670
	register_as_ext2();
T
Theodore Ts'o 已提交
5671
	err = register_filesystem(&ext4_fs_type);
5672 5673
	if (err)
		goto out;
5674

5675 5676
	return 0;
out:
5677 5678
	unregister_as_ext2();
	unregister_as_ext3();
5679 5680
	destroy_inodecache();
out1:
5681
	ext4_exit_mballoc();
5682
out2:
5683 5684
	ext4_exit_sysfs();
out3:
5685
	ext4_exit_system_zone();
5686
out4:
5687
	ext4_exit_pageio();
5688
out5:
5689 5690
	ext4_exit_es();

5691 5692 5693
	return err;
}

5694
static void __exit ext4_exit_fs(void)
5695
{
5696
	ext4_destroy_lazyinit_thread();
5697 5698
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5699
	unregister_filesystem(&ext4_fs_type);
5700
	destroy_inodecache();
5701
	ext4_exit_mballoc();
5702
	ext4_exit_sysfs();
5703 5704
	ext4_exit_system_zone();
	ext4_exit_pageio();
5705
	ext4_exit_es();
5706 5707 5708
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5709
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5710
MODULE_LICENSE("GPL");
5711 5712
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)