super.c 150.6 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

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

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

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

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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
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static int ext4_mballoc_ready;
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static struct ratelimit_state ext4_mount_msg_ratelimit;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
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static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
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	.mount		= ext4_mount,
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	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext3");
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MODULE_ALIAS("ext3");
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#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
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static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		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;
	}
	if (test_opt(sb, ERRORS_PANIC))
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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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#define ext4_error_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),	\
			     "EXT4-fs error")

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

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

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

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

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

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

	switch (errno) {
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	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
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	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
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		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
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			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

527
/* __ext4_std_error decodes expected errors from journaling functions
528 529
 * automatically and invokes the appropriate error response.  */

530 531
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
532 533 534 535 536 537 538 539 540 541 542
{
	char nbuf[16];
	const char *errstr;

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

543 544 545 546 547
	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);
	}
548

549
	save_error_info(sb, function, line);
550
	ext4_handle_error(sb);
551 552 553
}

/*
554
 * ext4_abort is a much stronger failure handler than ext4_error.  The
555 556 557 558 559 560 561 562
 * 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.
 */

563
void __ext4_abort(struct super_block *sb, const char *function,
564
		unsigned int line, const char *fmt, ...)
565 566 567
{
	va_list args;

568
	save_error_info(sb, function, line);
569
	va_start(args, fmt);
570 571
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
572 573 574 575
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

576 577 578
	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;
579 580 581 582 583 584
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
585 586 587 588
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
589
	if (test_opt(sb, ERRORS_PANIC))
590
		panic("EXT4-fs panic from previous error\n");
591 592
}

593 594
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
595
{
J
Joe Perches 已提交
596
	struct va_format vaf;
597 598
	va_list args;

599 600 601
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

602
	va_start(args, fmt);
J
Joe Perches 已提交
603 604 605
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
606 607 608
	va_end(args);
}

609 610 611 612
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

613
void __ext4_warning(struct super_block *sb, const char *function,
614
		    unsigned int line, const char *fmt, ...)
615
{
J
Joe Perches 已提交
616
	struct va_format vaf;
617 618
	va_list args;

619
	if (!ext4_warning_ratelimit(sb))
620 621
		return;

622
	va_start(args, fmt);
J
Joe Perches 已提交
623 624 625 626
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
627 628 629
	va_end(args);
}

630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647
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);
}

648 649 650 651
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, ...)
652 653 654
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
655
	struct va_format vaf;
656 657 658
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

659 660 661
	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
662

663 664 665 666 667 668 669 670 671 672 673 674 675 676
	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);
	}
677 678

	if (test_opt(sb, ERRORS_CONT)) {
679
		ext4_commit_super(sb, 0);
680 681
		return;
	}
682

683 684 685 686 687 688 689 690
	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
691
	 * ext4_grp_locked_error() to distinguish between the
692 693 694 695 696 697 698 699
	 * 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;
}

700
void ext4_update_dynamic_rev(struct super_block *sb)
701
{
702
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
703

704
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
705 706
		return;

707
	ext4_warning(sb,
708 709
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
710
		     EXT4_DYNAMIC_REV);
711

712 713 714
	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);
715 716 717 718 719 720 721 722 723 724 725 726 727
	/* 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
 */
728
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
729 730 731 732
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

733
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
734 735 736 737 738
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
739
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
740 741 742 743 744 745 746
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
747
static void ext4_blkdev_put(struct block_device *bdev)
748
{
A
Al Viro 已提交
749
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
750 751
}

A
Al Viro 已提交
752
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
753 754 755 756
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
757
		ext4_blkdev_put(bdev);
758 759 760 761 762 763
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
764
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
765 766
}

767
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
768 769 770
{
	struct list_head *l;

771 772
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
773 774 775 776 777 778 779 780 781 782 783 784

	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));
	}
}

785
static void ext4_put_super(struct super_block *sb)
786
{
787 788
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
789
	int i, err;
790

791
	ext4_unregister_li_request(sb);
792 793
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

794 795
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
796

797 798 799 800
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
801
			ext4_abort(sb, "Couldn't clean up the journal");
802
	}
803

804
	ext4_unregister_sysfs(sb);
805
	ext4_es_unregister_shrinker(sbi);
806
	del_timer_sync(&sbi->s_err_report);
807 808 809 810 811
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

812
	if (!(sb->s_flags & MS_RDONLY)) {
813
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
814 815
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
816
	if (!(sb->s_flags & MS_RDONLY))
817 818
		ext4_commit_super(sb, 1);

819 820
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
821 822
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
823
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
824 825
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
826
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
827 828
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
829
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
830 831 832 833 834 835 836 837 838 839 840
		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));

841
	sync_blockdev(sb->s_bdev);
842
	invalidate_bdev(sb->s_bdev);
843 844 845 846 847 848 849
	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);
850
		invalidate_bdev(sbi->journal_bdev);
851
		ext4_blkdev_remove(sbi);
852
	}
853 854 855 856
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
857 858
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
859
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
860 861 862 863 864 865
	/*
	 * 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);
866 867
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
868
	kfree(sbi->s_blockgroup_lock);
869 870 871
	kfree(sbi);
}

872
static struct kmem_cache *ext4_inode_cachep;
873 874 875 876

/*
 * Called inside transaction, so use GFP_NOFS
 */
877
static struct inode *ext4_alloc_inode(struct super_block *sb)
878
{
879
	struct ext4_inode_info *ei;
880

C
Christoph Lameter 已提交
881
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
882 883
	if (!ei)
		return NULL;
884

885
	ei->vfs_inode.i_version = 1;
886
	spin_lock_init(&ei->i_raw_lock);
887 888
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
889 890
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
891
	INIT_LIST_HEAD(&ei->i_es_list);
892
	ei->i_es_all_nr = 0;
893
	ei->i_es_shk_nr = 0;
894
	ei->i_es_shrink_lblk = 0;
895 896 897
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
898
	ei->i_da_metadata_calc_len = 0;
899
	ei->i_da_metadata_calc_last_lblock = 0;
900
	spin_lock_init(&(ei->i_block_reservation_lock));
901 902
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
J
Jan Kara 已提交
903
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
904
#endif
905
	ei->jinode = NULL;
906
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
907
	spin_lock_init(&ei->i_completed_io_lock);
908 909
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
910
	atomic_set(&ei->i_ioend_count, 0);
911
	atomic_set(&ei->i_unwritten, 0);
912
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
913
#ifdef CONFIG_EXT4_FS_ENCRYPTION
914
	ei->i_crypt_info = NULL;
915
#endif
916 917 918
	return &ei->vfs_inode;
}

919 920 921 922 923 924 925 926
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
927 928 929 930 931 932
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));
}

933
static void ext4_destroy_inode(struct inode *inode)
934
{
935
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
936 937 938
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
939 940 941 942 943
		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
944
	call_rcu(&inode->i_rcu, ext4_i_callback);
945 946
}

947
static void init_once(void *foo)
948
{
949
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
950

C
Christoph Lameter 已提交
951 952
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
953
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
954
	inode_init_once(&ei->vfs_inode);
955 956
}

957
static int __init init_inodecache(void)
958
{
959 960
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
961 962
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
963
					     init_once);
964
	if (ext4_inode_cachep == NULL)
965 966 967 968 969 970
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
971 972 973 974 975
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
976
	kmem_cache_destroy(ext4_inode_cachep);
977 978
}

A
Al Viro 已提交
979
void ext4_clear_inode(struct inode *inode)
980
{
A
Al Viro 已提交
981
	invalidate_inode_buffers(inode);
982
	clear_inode(inode);
983
	dquot_drop(inode);
984
	ext4_discard_preallocations(inode);
985
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
986 987 988 989 990 991
	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;
	}
992 993
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	if (EXT4_I(inode)->i_crypt_info)
994
		ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
995
#endif
996 997
}

C
Christoph Hellwig 已提交
998
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
999
					u64 ino, u32 generation)
1000 1001 1002
{
	struct inode *inode;

1003
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1004
		return ERR_PTR(-ESTALE);
1005
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1006 1007 1008 1009
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1010
	 * ext4_read_inode will return a bad_inode if the inode had been
1011 1012 1013 1014 1015
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1016
	inode = ext4_iget_normal(sb, ino);
1017 1018 1019
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1020 1021 1022
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1023 1024 1025 1026 1027

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1028
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1029 1030 1031 1032 1033 1034
{
	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,
1035
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1036 1037 1038
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1039 1040
}

1041 1042 1043 1044 1045 1046
/*
 * 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.
 */
1047 1048
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
{
	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,
							wait & ~__GFP_WAIT);
	return try_to_free_buffers(page);
}

1061
#ifdef CONFIG_QUOTA
1062
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1063
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1064

1065 1066 1067 1068 1069
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);
1070
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1071
			 struct path *path);
1072
static int ext4_quota_off(struct super_block *sb, int type);
1073 1074
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,
1075
			       size_t len, loff_t off);
1076
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1077
				const char *data, size_t len, loff_t off);
1078 1079 1080
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);
1081

J
Jan Kara 已提交
1082 1083 1084 1085 1086
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1087
static const struct dquot_operations ext4_quota_operations = {
1088
	.get_reserved_space = ext4_get_reserved_space,
1089 1090 1091 1092
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1093 1094 1095
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1096 1097
};

1098
static const struct quotactl_ops ext4_qctl_operations = {
1099
	.quota_on	= ext4_quota_on,
1100
	.quota_off	= ext4_quota_off,
1101
	.quota_sync	= dquot_quota_sync,
1102
	.get_state	= dquot_get_state,
1103 1104 1105
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1106 1107 1108
};
#endif

1109
static const struct super_operations ext4_sops = {
1110 1111 1112 1113
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1114
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1115
	.evict_inode	= ext4_evict_inode,
1116 1117
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1118 1119
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1120 1121 1122
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1123
#ifdef CONFIG_QUOTA
1124 1125
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
J
Jan Kara 已提交
1126
	.get_dquots	= ext4_get_dquots,
1127
#endif
1128
	.bdev_try_to_free_page = bdev_try_to_free_page,
1129 1130
};

1131
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1132 1133
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1134
	.get_parent = ext4_get_parent,
1135 1136 1137 1138 1139
};

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,
1140
	Opt_nouid32, Opt_debug, Opt_removed,
1141
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1142
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1143 1144
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1145
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1146
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1147
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1148
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1149
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
R
Ross Zwisler 已提交
1150
	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1151
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1152
	Opt_lazytime, Opt_nolazytime,
1153
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1154
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1155
	Opt_dioread_nolock, Opt_dioread_lock,
1156
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1157
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1158 1159
};

1160
static const match_table_t tokens = {
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	{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"},
1175 1176
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1177 1178 1179 1180
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1181
	{Opt_noload, "norecovery"},
1182
	{Opt_noload, "noload"},
1183 1184
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1185
	{Opt_commit, "commit=%u"},
1186 1187
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1188
	{Opt_journal_dev, "journal_dev=%u"},
1189
	{Opt_journal_path, "journal_path=%s"},
1190
	{Opt_journal_checksum, "journal_checksum"},
1191
	{Opt_nojournal_checksum, "nojournal_checksum"},
1192
	{Opt_journal_async_commit, "journal_async_commit"},
1193 1194 1195 1196
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1197 1198
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1199 1200 1201 1202 1203 1204
	{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
1205
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1206 1207 1208 1209 1210
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1211 1212
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1213
	{Opt_i_version, "i_version"},
R
Ross Zwisler 已提交
1214
	{Opt_dax, "dax"},
1215
	{Opt_stripe, "stripe=%u"},
1216
	{Opt_delalloc, "delalloc"},
1217 1218
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1219
	{Opt_nodelalloc, "nodelalloc"},
1220 1221
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1222 1223
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1224
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1225
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1226
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1227 1228
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1229 1230
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1231 1232
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1233 1234 1235
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1236
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1237
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1238 1239 1240 1241 1242
	{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
1243
	{Opt_err, NULL},
1244 1245
};

1246
static ext4_fsblk_t get_sb_block(void **data)
1247
{
1248
	ext4_fsblk_t	sb_block;
1249 1250 1251 1252
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1253

1254
	options += 3;
1255
	/* TODO: use simple_strtoll with >32bit ext4 */
1256 1257
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1258
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1259 1260 1261 1262 1263 1264
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1265

1266 1267 1268
	return sb_block;
}

1269
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1270 1271
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";
1272

D
Dmitry Monakhov 已提交
1273 1274 1275 1276 1277
#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;
1278
	int ret = -1;
D
Dmitry Monakhov 已提交
1279 1280 1281 1282 1283 1284

	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");
1285
		return -1;
D
Dmitry Monakhov 已提交
1286
	}
1287 1288 1289 1290 1291
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
		ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
			 "when QUOTA feature is enabled");
		return -1;
	}
D
Dmitry Monakhov 已提交
1292 1293 1294 1295
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1296
		return -1;
D
Dmitry Monakhov 已提交
1297
	}
1298 1299 1300 1301 1302 1303 1304 1305
	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
1306
	}
1307
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1308 1309
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1310
		goto errout;
D
Dmitry Monakhov 已提交
1311
	}
1312
	sbi->s_qf_names[qtype] = qname;
1313
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1314
	return 1;
1315 1316 1317
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
}

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");
1329
		return -1;
D
Dmitry Monakhov 已提交
1330
	}
1331
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1332 1333 1334 1335 1336
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1337 1338 1339 1340 1341 1342
#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
1343
#ifdef CONFIG_QUOTA
1344 1345 1346 1347 1348
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1349
#endif
1350
#define MOPT_DATAJ	0x0080
1351 1352 1353
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1354
#define MOPT_STRING	0x0400
1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366

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},
1367 1368 1369 1370
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1371 1372
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1373 1374 1375
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1376
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1377 1378
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1379 1380
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1381
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1382 1383 1384
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1385 1386 1387
	{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},
1388 1389 1390 1391
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_SET},
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_CLEAR},
1392 1393 1394 1395 1396 1397 1398 1399 1400 1401
	{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
1402
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1403
	{Opt_stripe, 0, MOPT_GTE0},
1404 1405
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1406 1407 1408
	{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},
1409 1410 1411 1412
	{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},
1413 1414
	{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
1415
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 1417
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1418
#else
1419 1420
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1421
#endif
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
	{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
	{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
	{Opt_usrjquota, 0, MOPT_Q},
	{Opt_grpjquota, 0, MOPT_Q},
	{Opt_offusrjquota, 0, MOPT_Q},
	{Opt_offgrpjquota, 0, MOPT_Q},
	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1438
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1439
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1440 1441 1442 1443 1444 1445 1446 1447 1448
	{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;
1449 1450
	kuid_t uid;
	kgid_t gid;
1451 1452
	int arg = 0;

1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
#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
1463
	switch (token) {
1464 1465 1466 1467
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1468 1469 1470
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1471
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1472 1473 1474 1475 1476 1477 1478
		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;
1479 1480 1481 1482 1483 1484
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1485 1486
	}

1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
	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;
	}

1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
	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;
	}

1508
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
	if (m->flags & MOPT_EXPLICIT)
		set_opt2(sb, EXPLICIT_DELALLOC);
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1533 1534 1535 1536
		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");
1537
			return -1;
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
		}
		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);
1553 1554
			return -1;
		}
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
		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;
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
	} 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;
		}

1596
		journal_inode = d_inode(path.dentry);
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
		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);
1608 1609 1610 1611 1612 1613 1614 1615
	} 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);
1616 1617 1618 1619 1620 1621 1622 1623 1624
	} 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
1625 1626 1627 1628 1629
	} 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) {
1630
				ext4_msg(sb, KERN_ERR,
1631 1632
					 "Cannot change data mode on remount");
				return -1;
1633
			}
1634
		} else {
1635 1636
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1637
		}
1638 1639 1640 1641 1642 1643 1644 1645
#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;
		}
1646 1647 1648 1649 1650 1651 1652
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					       EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot set journaled quota options "
				 "when QUOTA feature is enabled");
			return -1;
		}
1653
		sbi->s_jquota_fmt = m->mount_opt;
R
Ross Zwisler 已提交
1654 1655 1656 1657 1658
#endif
#ifndef CONFIG_FS_DAX
	} else if (token == Opt_dax) {
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
#endif
	} else {
		if (!args->from)
			arg = 1;
		if (m->flags & MOPT_CLEAR)
			arg = !arg;
		else if (unlikely(!(m->flags & MOPT_SET))) {
			ext4_msg(sb, KERN_WARNING,
				 "buggy handling of option %s", opt);
			WARN_ON(1);
			return -1;
		}
		if (arg != 0)
			sbi->s_mount_opt |= m->mount_opt;
		else
			sbi->s_mount_opt &= ~m->mount_opt;
1675
	}
1676
	return 1;
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698
}

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.
		 */
1699
		args[0].to = args[0].from = NULL;
1700 1701 1702 1703
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1704 1705
	}
#ifdef CONFIG_QUOTA
1706 1707 1708 1709 1710 1711
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
		ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
			 "feature is enabled");
		return 0;
	}
1712
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1713
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1714
			clear_opt(sb, USRQUOTA);
1715

1716
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1717
			clear_opt(sb, GRPQUOTA);
1718

D
Dmitry Monakhov 已提交
1719
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1720 1721
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1722 1723 1724 1725
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1726 1727
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1728 1729 1730 1731
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1732 1733 1734 1735 1736 1737 1738 1739 1740 1741
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

		if (blocksize < PAGE_CACHE_SIZE) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1742 1743 1744 1745 1746 1747
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
	    test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
			 "in data=ordered mode");
		return 0;
	}
1748 1749 1750
	return 1;
}

1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
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])
1775
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1776 1777

	if (sbi->s_qf_names[GRPQUOTA])
1778
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1779 1780 1781
#endif
}

1782 1783
static const char *token2str(int token)
{
1784
	const struct match_token *t;
1785 1786 1787 1788 1789 1790 1791

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

1792 1793 1794 1795 1796
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1797 1798
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1799 1800 1801
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1802
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1803
	const struct mount_opts *m;
1804
	char sep = nodefs ? '\n' : ',';
1805

1806 1807
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1808 1809

	if (sbi->s_sb_block != 1)
1810 1811 1812 1813 1814 1815 1816
		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;
1817
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1818 1819 1820 1821 1822 1823
			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));
1824
	}
1825

1826
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1827
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1828 1829 1830
		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)) ||
1831
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1832 1833
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1834
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1835 1836
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1837
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1838
		SEQ_OPTS_PUTS("errors=continue");
1839
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1840
		SEQ_OPTS_PUTS("errors=panic");
1841
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1842
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1843
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1844
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1845
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1846
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1847
	if (sb->s_flags & MS_I_VERSION)
1848
		SEQ_OPTS_PUTS("i_version");
1849
	if (nodefs || sbi->s_stripe)
1850
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1851
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1852 1853 1854 1855 1856 1857 1858
		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");
	}
1859 1860
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1861 1862
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1863

1864 1865
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1866
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1867 1868
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1869 1870 1871 1872 1873

	ext4_show_quota_options(seq, sb);
	return 0;
}

1874 1875 1876 1877 1878
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

1879
int ext4_seq_options_show(struct seq_file *seq, void *offset)
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
{
	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;
}

1890
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1891 1892
			    int read_only)
{
1893
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1894 1895
	int res = 0;

1896
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1897 1898
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1899 1900 1901
		res = MS_RDONLY;
	}
	if (read_only)
1902
		goto done;
1903
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1904 1905
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1906
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1907 1908 1909
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1910
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1911 1912
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1913 1914 1915
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1916 1917 1918
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1919 1920 1921
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1922
	if (!sbi->s_journal)
1923
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1924
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1925
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1926
	le16_add_cpu(&es->s_mnt_count, 1);
1927
	es->s_mtime = cpu_to_le32(get_seconds());
1928
	ext4_update_dynamic_rev(sb);
1929 1930
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1931

1932
	ext4_commit_super(sb, 1);
1933
done:
1934
	if (test_opt(sb, DEBUG))
1935
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1936
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1937 1938
			sb->s_blocksize,
			sbi->s_groups_count,
1939 1940
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1941
			sbi->s_mount_opt, sbi->s_mount_opt2);
1942

D
Dan Magenheimer 已提交
1943
	cleancache_init_fs(sb);
1944 1945 1946
	return res;
}

1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
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
1972
		kvfree(sbi->s_flex_groups);
1973 1974 1975 1976 1977 1978
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

1979 1980 1981 1982 1983
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;
1984
	int i, err;
1985

1986
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1987
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1988 1989 1990 1991
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1992 1993
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1994
		goto failed;
1995 1996

	for (i = 0; i < sbi->s_groups_count; i++) {
1997
		gdp = ext4_get_group_desc(sb, i, NULL);
1998 1999

		flex_group = ext4_flex_group(sbi, i);
2000 2001
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2002 2003
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2004 2005
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2006 2007 2008 2009 2010 2011 2012
	}

	return 1;
failed:
	return 0;
}

2013 2014
static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
				   struct ext4_group_desc *gdp)
A
Andreas Dilger 已提交
2015
{
2016
	int offset;
A
Andreas Dilger 已提交
2017
	__u16 crc = 0;
2018
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
2019

2020
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2021
		/* Use new metadata_csum algorithm */
2022
		__le16 save_csum;
2023 2024
		__u32 csum32;

2025
		save_csum = gdp->bg_checksum;
2026 2027 2028 2029 2030
		gdp->bg_checksum = 0;
		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
				     sbi->s_desc_size);
2031
		gdp->bg_checksum = save_csum;
2032 2033 2034

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2035 2036
	}

2037
	/* old crc16 code */
2038 2039 2040 2041
	if (!(sbi->s_es->s_feature_ro_compat &
	      cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
		return 0;

2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
	offset = offsetof(struct ext4_group_desc, bg_checksum);

	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
	crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
	crc = crc16(crc, (__u8 *)gdp, offset);
	offset += sizeof(gdp->bg_checksum); /* skip checksum */
	/* for checksum of struct ext4_group_desc do the rest...*/
	if ((sbi->s_es->s_feature_incompat &
	     cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
	    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
2057 2058 2059
	return cpu_to_le16(crc);
}

2060
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2061 2062
				struct ext4_group_desc *gdp)
{
2063 2064 2065
	if (ext4_has_group_desc_csum(sb) &&
	    (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
						      block_group, gdp)))
A
Andreas Dilger 已提交
2066 2067 2068 2069 2070
		return 0;

	return 1;
}

2071 2072 2073 2074 2075 2076 2077 2078
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;
	gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
}

2079
/* Called at mount-time, super-block is locked */
2080 2081
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2082
{
2083 2084 2085
	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
2086 2087 2088
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2089
	int flexbg_flag = 0;
2090
	ext4_group_t i, grp = sbi->s_groups_count;
2091

J
Jose R. Santos 已提交
2092 2093 2094
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2095
	ext4_debug("Checking group descriptors");
2096

2097 2098 2099
	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
2100
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2101
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2102 2103
		else
			last_block = first_block +
2104
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2105

2106 2107 2108 2109
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2110
		block_bitmap = ext4_block_bitmap(sb, gdp);
2111
		if (block_bitmap < first_block || block_bitmap > last_block) {
2112
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2113
			       "Block bitmap for group %u not in group "
2114
			       "(block %llu)!", i, block_bitmap);
2115 2116
			return 0;
		}
2117
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2118
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2119
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2120
			       "Inode bitmap for group %u not in group "
2121
			       "(block %llu)!", i, inode_bitmap);
2122 2123
			return 0;
		}
2124
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2125
		if (inode_table < first_block ||
2126
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2127
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2128
			       "Inode table for group %u not in group "
2129
			       "(block %llu)!", i, inode_table);
2130 2131
			return 0;
		}
2132
		ext4_lock_group(sb, i);
2133
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2134 2135 2136 2137
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
				 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2138
			if (!(sb->s_flags & MS_RDONLY)) {
2139
				ext4_unlock_group(sb, i);
2140
				return 0;
2141
			}
A
Andreas Dilger 已提交
2142
		}
2143
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2144 2145
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2146
	}
2147 2148
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2149 2150 2151
	return 1;
}

2152
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
 * 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
2165
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2166 2167 2168
 * 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.
 */
2169 2170
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2182
	if (bdev_read_only(sb->s_bdev)) {
2183 2184
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2185 2186 2187
		return;
	}

2188 2189 2190 2191 2192 2193 2194
	/* 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;
	}

2195
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2196 2197
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2198
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2199
				  "clearing orphan list.\n");
2200 2201
			es->s_last_orphan = 0;
		}
2202 2203 2204 2205 2206
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2207
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2208 2209 2210 2211 2212 2213
		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
2214
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2215 2216
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2217
			if (ret < 0)
2218 2219 2220
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2221 2222 2223 2224 2225 2226 2227
		}
	}
#endif

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

2228 2229
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2230 2231 2232 2233
			es->s_last_orphan = 0;
			break;
		}

2234
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2235
		dquot_initialize(inode);
2236
		if (inode->i_nlink) {
2237 2238 2239 2240
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2241
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2242
				  inode->i_ino, inode->i_size);
2243
			mutex_lock(&inode->i_mutex);
2244
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2245
			ext4_truncate(inode);
2246
			mutex_unlock(&inode->i_mutex);
2247 2248
			nr_truncates++;
		} else {
2249 2250 2251 2252
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2253 2254 2255 2256 2257 2258 2259
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2260
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2261 2262

	if (nr_orphans)
2263 2264
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2265
	if (nr_truncates)
2266 2267
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2268 2269
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2270
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2271
		if (sb_dqopt(sb)->files[i])
2272
			dquot_quota_off(sb, i);
2273 2274 2275 2276
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2277

2278 2279 2280 2281 2282 2283 2284
/*
 * 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.
 *
2285 2286 2287 2288 2289 2290
 * 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.
 *
2291 2292
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2293
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2294 2295 2296 2297 2298
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2299
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2300
		/*
2301
		 * CONFIG_LBDAF is not enabled implies the inode
2302 2303 2304 2305 2306 2307 2308 2309 2310 2311
		 * 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;
	}

2312 2313 2314 2315 2316 2317
	/*
	 * 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;
2318 2319 2320 2321 2322 2323 2324 2325
	res <<= blkbits;

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

	return res;
}
2326 2327

/*
2328
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2329 2330
 * 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.
2331
 */
2332
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2333
{
2334
	loff_t res = EXT4_NDIR_BLOCKS;
2335 2336
	int meta_blocks;
	loff_t upper_limit;
2337 2338 2339 2340 2341 2342
	/* 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.
2343 2344
	 */

2345
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2346
		/*
2347
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2348 2349
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2350 2351 2352 2353 2354 2355 2356
		 */
		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
2357 2358 2359 2360 2361 2362
		/*
		 * 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
		 */
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375
		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;
2376 2377 2378 2379 2380 2381 2382

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2383 2384 2385 2386

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2387 2388 2389
	return res;
}

2390
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2391
				   ext4_fsblk_t logical_sb_block, int nr)
2392
{
2393
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2394
	ext4_group_t bg, first_meta_bg;
2395 2396 2397 2398
	int has_super = 0;

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

2399
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2400
	    nr < first_meta_bg)
2401
		return logical_sb_block + nr + 1;
2402
	bg = sbi->s_desc_per_block * nr;
2403
	if (ext4_bg_has_super(sb, bg))
2404
		has_super = 1;
2405

2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
	/*
	 * 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++;

2416
	return (has_super + ext4_group_first_block_no(sb, bg));
2417 2418
}

2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434
/**
 * 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
2435
	int ret;
2436 2437

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2438 2439 2440 2441 2442 2443 2444
		ret = sbi->s_stripe;
	else if (stripe_width <= sbi->s_blocks_per_group)
		ret = stripe_width;
	else if (stride <= sbi->s_blocks_per_group)
		ret = stride;
	else
		ret = 0;
2445

D
Dan Ehrenberg 已提交
2446 2447 2448 2449 2450 2451
	/*
	 * 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;
2452

D
Dan Ehrenberg 已提交
2453
	return ret;
2454
}
2455

2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475
/*
 * 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)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
		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;

D
Darrick J. Wong 已提交
2476 2477 2478 2479 2480 2481
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501
	/* Check that feature set is OK for a read-write mount */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
		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
	 */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2502 2503 2504 2505 2506 2507 2508
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518

#ifndef CONFIG_QUOTA
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !readonly) {
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
#endif  /* CONFIG_QUOTA */
2519 2520 2521
	return 1;
}

2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535
/*
 * 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)
2536 2537
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2538 2539
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2540
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
2554
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581
/* 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;

2582
	sb_start_write(sb);
2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593
	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;
	}

2594
	if (group >= ngroups)
2595 2596 2597 2598 2599 2600 2601
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2602 2603
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2604 2605 2606 2607 2608
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2609
	sb_end_write(sb);
2610 2611 2612 2613 2614 2615

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2616
 * request structure. Should be called with li_list_mtx held
2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633
 */
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)
{
2634 2635 2636
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2637
		return;
2638
	}
2639 2640

	mutex_lock(&ext4_li_info->li_list_mtx);
2641
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2642
	mutex_unlock(&ext4_li_info->li_list_mtx);
2643
	mutex_unlock(&ext4_li_mtx);
2644 2645
}

2646 2647
static struct task_struct *ext4_lazyinit_task;

2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661
/*
 * 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;
2662
	unsigned long next_wakeup, cur;
2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679

	BUG_ON(NULL == eli);

cont_thread:
	while (true) {
		next_wakeup = MAX_JIFFY_OFFSET;

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

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

2680 2681 2682 2683 2684 2685
			if (time_after_eq(jiffies, elr->lr_next_sched)) {
				if (ext4_run_li_request(elr) != 0) {
					/* error, remove the lazy_init job */
					ext4_remove_li_request(elr);
					continue;
				}
2686 2687 2688 2689 2690 2691 2692
			}

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

2693
		try_to_freeze();
2694

2695 2696
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2697
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2698 2699 2700 2701
			cond_resched();
			continue;
		}

2702 2703
		schedule_timeout_interruptible(next_wakeup - cur);

2704 2705 2706 2707
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
	}

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)
{
2750 2751 2752 2753
	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);
2754 2755 2756
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2757
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
				 "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.
	 */
2826 2827
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
2828 2829 2830
	return elr;
}

2831 2832
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
2833 2834
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2835
	struct ext4_li_request *elr = NULL;
2836
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2837
	int ret = 0;
2838

2839
	mutex_lock(&ext4_li_mtx);
2840 2841 2842 2843 2844 2845
	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;
2846
		goto out;
2847
	}
2848 2849 2850

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
2851
	    !test_opt(sb, INIT_INODE_TABLE))
2852
		goto out;
2853 2854

	elr = ext4_li_request_new(sb, first_not_zeroed);
2855 2856 2857 2858
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870

	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;
2871 2872 2873 2874 2875 2876
	/*
	 * 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;
2877 2878 2879 2880 2881 2882 2883

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
2884 2885
	mutex_unlock(&ext4_li_mtx);
	if (ret)
2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899
		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.
	 */
2900
	if (!ext4_li_info || !ext4_lazyinit_task)
2901 2902
		return;

2903
	kthread_stop(ext4_lazyinit_task);
2904 2905
}

2906 2907 2908 2909 2910 2911
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);

2912
	if (ext4_has_metadata_csum(sb)) {
2913
		/* journal checksum v3 */
2914
		compat = 0;
2915
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
2916 2917 2918 2919 2920 2921
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

2922 2923 2924 2925
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937
	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 {
2938 2939
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2940 2941 2942 2943 2944
	}

	return ret;
}

2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968
/*
 * 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;

2969 2970 2971 2972
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
		(grp * EXT4_BLOCKS_PER_GROUP(sb));
	last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
	for (i = 0; i < ngroups; i++) {
		gdp = ext4_get_group_desc(sb, i, NULL);
		b = ext4_block_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_table(sb, gdp);
		if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
			for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
				int c = EXT4_B2C(sbi, b - first_block);
				ext4_set_bit(c, buf);
				count++;
			}
		if (i != grp)
			continue;
		s = 0;
		if (ext4_bg_has_super(sb, grp)) {
			ext4_set_bit(s++, buf);
			count++;
		}
		for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
			count++;
		}
	}
	if (!count)
		return 0;
	return EXT4_CLUSTERS_PER_GROUP(sb) -
		ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
}

/*
 * Compute the overhead and stash it in sbi->s_overhead
 */
int ext4_calculate_overhead(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
3022
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
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

	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();
	}
3050 3051
	/* Add the internal journal blocks as well */
	if (sbi->s_journal && !sbi->journal_bdev)
3052
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3053

3054 3055 3056 3057 3058 3059
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3060
static void ext4_set_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3061 3062
{
	ext4_fsblk_t resv_clusters;
3063
	struct ext4_sb_info *sbi = EXT4_SB(sb);
L
Lukas Czerner 已提交
3064

3065 3066 3067 3068 3069 3070 3071
	/*
	 * 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.
	 */
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3072
		return;
L
Lukas Czerner 已提交
3073 3074 3075 3076
	/*
	 * 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
3077
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3078 3079 3080
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3081 3082
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
L
Lukas Czerner 已提交
3083 3084 3085 3086

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

3087
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
L
Lukas Czerner 已提交
3088 3089
}

3090
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3091
{
3092
	char *orig_data = kstrdup(data, GFP_KERNEL);
3093
	struct buffer_head *bh;
3094 3095 3096 3097
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3098
	ext4_fsblk_t logical_sb_block;
3099 3100 3101 3102
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3103
	const char *descr;
3104
	int ret = -ENOMEM;
3105
	int blocksize, clustersize;
3106 3107
	unsigned int db_count;
	unsigned int i;
3108
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3109
	__u64 blocks_count;
3110
	int err = 0;
3111
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3112
	ext4_group_t first_not_zeroed;
3113 3114 3115

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3116
		goto out_free_orig;
3117 3118 3119 3120 3121

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3122
		goto out_free_orig;
3123
	}
3124
	sb->s_fs_info = sbi;
3125
	sbi->s_sb = sb;
3126
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3127
	sbi->s_sb_block = sb_block;
3128 3129 3130
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3131

3132
	/* Cleanup superblock name */
3133
	strreplace(sb->s_id, '/', '!');
3134

3135
	/* -EINVAL is default */
3136
	ret = -EINVAL;
3137
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3138
	if (!blocksize) {
3139
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3140 3141 3142 3143
		goto out_fail;
	}

	/*
3144
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3145 3146
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3147
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3148 3149
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3150
	} else {
3151
		logical_sb_block = sb_block;
3152 3153
	}

3154
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3155
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3156 3157 3158 3159
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3160
	 *       some ext4 macro-instructions depend on its value
3161
	 */
3162
	es = (struct ext4_super_block *) (bh->b_data + offset);
3163 3164
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3165 3166
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3167
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3168

3169 3170 3171 3172
	/* Warn if metadata_csum and gdt_csum are both set. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3173
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3174 3175
			     "redundant flags; please run fsck.");

3176 3177 3178 3179 3180 3181 3182 3183
	/* 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;
	}

3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
	/* Load the checksum driver */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		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;
		}
	}

3196 3197 3198 3199 3200
	/* 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;
3201
		ret = -EFSBADCRC;
3202 3203 3204 3205
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3206 3207 3208
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_CSUM_SEED))
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3209 3210 3211
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3212 3213
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3214
	set_opt(sb, INIT_INODE_TABLE);
3215
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3216
		set_opt(sb, DEBUG);
3217
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3218
		set_opt(sb, GRPID);
3219
	if (def_mount_opts & EXT4_DEFM_UID16)
3220
		set_opt(sb, NO_UID32);
3221 3222
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3223
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3224
	set_opt(sb, POSIX_ACL);
3225
#endif
3226 3227 3228 3229
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3230
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3231
		set_opt(sb, JOURNAL_DATA);
3232
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3233
		set_opt(sb, ORDERED_DATA);
3234
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3235
		set_opt(sb, WRITEBACK_DATA);
3236 3237

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3238
		set_opt(sb, ERRORS_PANIC);
3239
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3240
		set_opt(sb, ERRORS_CONT);
3241
	else
3242
		set_opt(sb, ERRORS_RO);
3243 3244
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3245
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3246
		set_opt(sb, DISCARD);
3247

3248 3249
	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));
3250 3251 3252
	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;
3253

3254
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3255
		set_opt(sb, BARRIER);
3256

3257 3258 3259 3260
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3261
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3262
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3263
		set_opt(sb, DELALLOC);
3264

3265 3266 3267 3268 3269 3270
	/*
	 * 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;

3271
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3272
			   &journal_devnum, &journal_ioprio, 0)) {
3273 3274 3275 3276
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3277
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3278
	if (!parse_options((char *) data, sb, &journal_devnum,
3279
			   &journal_ioprio, 0))
3280 3281
		goto failed_mount;

3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292
	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 "
3293
				 "both data=journal and dioread_nolock");
3294 3295
			goto failed_mount;
		}
R
Ross Zwisler 已提交
3296 3297 3298 3299 3300
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3301 3302
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3303 3304
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3305 3306
	}

3307
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3308
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3309

3310 3311 3312 3313
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3314 3315 3316
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3317

3318 3319 3320 3321 3322 3323 3324 3325 3326 3327
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
		if (EXT4_HAS_INCOMPAT_FEATURE(sb,
					      EXT4_FEATURE_INCOMPAT_64BIT)) {
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349
	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;
		}
	}

3350 3351 3352 3353 3354
	/*
	 * 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.
	 */
3355
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3356
		goto failed_mount;
3357

J
Jan Kara 已提交
3358
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3359 3360
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3361 3362
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3363 3364 3365
		goto failed_mount;
	}

R
Ross Zwisler 已提交
3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
		if (blocksize != PAGE_SIZE) {
			ext4_msg(sb, KERN_ERR,
					"error: unsupported blocksize for dax");
			goto failed_mount;
		}
		if (!sb->s_bdev->bd_disk->fops->direct_access) {
			ext4_msg(sb, KERN_ERR,
					"error: device does not support dax");
			goto failed_mount;
		}
	}

3379 3380 3381 3382 3383 3384 3385
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
	    es->s_encryption_level) {
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3386
	if (sb->s_blocksize != blocksize) {
3387 3388
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3389
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3390
					blocksize);
3391 3392 3393
			goto failed_mount;
		}

3394
		brelse(bh);
3395 3396
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3397
		bh = sb_bread_unmovable(sb, logical_sb_block);
3398
		if (!bh) {
3399 3400
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3401 3402
			goto failed_mount;
		}
3403
		es = (struct ext4_super_block *)(bh->b_data + offset);
3404
		sbi->s_es = es;
3405
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3406 3407
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3408 3409 3410 3411
			goto failed_mount;
		}
	}

3412 3413
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3414 3415 3416
	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);
3417

3418 3419 3420
	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;
3421 3422 3423
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3424
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3425
		    (!is_power_of_2(sbi->s_inode_size)) ||
3426
		    (sbi->s_inode_size > blocksize)) {
3427 3428
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3429
			       sbi->s_inode_size);
3430 3431
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3432 3433
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3434
	}
3435

3436 3437
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3438
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3439
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3440
		    !is_power_of_2(sbi->s_desc_size)) {
3441 3442
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3443 3444 3445 3446 3447
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3448

3449 3450
	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);
3451
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3452
		goto cantfind_ext4;
3453

3454
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3455
	if (sbi->s_inodes_per_block == 0)
3456
		goto cantfind_ext4;
3457 3458
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3459
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3460 3461
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3462 3463
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3464

3465
	for (i = 0; i < 4; i++)
3466 3467
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3468 3469 3470 3471 3472
	if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
		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) {
3473
#ifdef __CHAR_UNSIGNED__
3474 3475 3476 3477
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3478
#else
3479 3480 3481
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3482
#endif
3483
		}
3484
	}
3485

3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
	has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_BIGALLOC);
	if (has_bigalloc) {
		if (clustersize < blocksize) {
			ext4_msg(sb, KERN_ERR,
				 "cluster size (%d) smaller than "
				 "block size (%d)", clustersize, blocksize);
			goto failed_mount;
		}
		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
			le32_to_cpu(es->s_log_block_size);
		sbi->s_clusters_per_group =
			le32_to_cpu(es->s_clusters_per_group);
		if (sbi->s_clusters_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#clusters per group too big: %lu",
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
		if (sbi->s_blocks_per_group !=
		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
				 "clusters per group (%lu) inconsistent",
				 sbi->s_blocks_per_group,
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
	} else {
		if (clustersize != blocksize) {
			ext4_warning(sb, "fragment/cluster size (%d) != "
				     "block size (%d)", clustersize,
				     blocksize);
			clustersize = blocksize;
		}
		if (sbi->s_blocks_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#blocks per group too big: %lu",
				 sbi->s_blocks_per_group);
			goto failed_mount;
		}
		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
		sbi->s_cluster_bits = 0;
3530
	}
3531 3532
	sbi->s_cluster_ratio = clustersize / blocksize;

3533
	if (sbi->s_inodes_per_group > blocksize * 8) {
3534 3535
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3536
		       sbi->s_inodes_per_group);
3537 3538 3539
		goto failed_mount;
	}

3540 3541 3542 3543
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3544 3545 3546 3547
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3548
	err = generic_check_addressable(sb->s_blocksize_bits,
3549
					ext4_blocks_count(es));
3550
	if (err) {
3551
		ext4_msg(sb, KERN_ERR, "filesystem"
3552
			 " too large to mount safely on this system");
3553
		if (sizeof(sector_t) < 8)
3554
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3555 3556 3557
		goto failed_mount;
	}

3558 3559
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3560

3561 3562 3563
	/* 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) {
3564 3565
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3566 3567 3568 3569
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3570 3571 3572 3573 3574
	/*
	 * 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)) {
3575
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3576 3577 3578
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3579 3580
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3581 3582 3583 3584
	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));
3585
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3586
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3587
		       "(block count %llu, first data block %u, "
3588
		       "blocks per group %lu)", sbi->s_groups_count,
3589 3590 3591 3592 3593
		       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
3594
	sbi->s_groups_count = blocks_count;
3595 3596
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3597 3598
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3599 3600 3601
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3602
	if (sbi->s_group_desc == NULL) {
3603
		ext4_msg(sb, KERN_ERR, "not enough memory");
3604
		ret = -ENOMEM;
3605 3606 3607
		goto failed_mount;
	}

3608
	bgl_lock_init(sbi->s_blockgroup_lock);
3609 3610

	for (i = 0; i < db_count; i++) {
3611
		block = descriptor_loc(sb, logical_sb_block, i);
3612
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3613
		if (!sbi->s_group_desc[i]) {
3614 3615
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3616 3617 3618 3619
			db_count = i;
			goto failed_mount2;
		}
	}
3620
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3621
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3622
		ret = -EFSCORRUPTED;
3623
		goto failed_mount2;
3624
	}
3625

3626
	sbi->s_gdb_count = db_count;
3627 3628 3629
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3630 3631
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3632

3633
	/* Register extent status tree shrinker */
3634
	if (ext4_es_register_shrinker(sbi))
3635 3636
		goto failed_mount3;

3637
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3638
	sbi->s_extent_max_zeroout_kb = 32;
3639

3640 3641 3642
	/*
	 * set up enough so that it can read an inode
	 */
3643
	sb->s_op = &ext4_sops;
3644 3645
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3646
#ifdef CONFIG_QUOTA
3647
	sb->dq_op = &ext4_quota_operations;
3648
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3649
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3650 3651
	else
		sb->s_qcop = &ext4_qctl_operations;
J
Jan Kara 已提交
3652
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
3653
#endif
3654 3655
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3656
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3657
	mutex_init(&sbi->s_orphan_lock);
3658 3659 3660 3661

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3662 3663
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3664

3665 3666 3667
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
	    !(sb->s_flags & MS_RDONLY))
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3668
			goto failed_mount3a;
3669

3670 3671 3672 3673 3674
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
	if (!test_opt(sb, NOLOAD) &&
3675 3676
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3677
			goto failed_mount3a;
3678 3679
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3680 3681
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3682
		goto failed_mount_wq;
3683
	} else {
3684
		clear_opt(sb, DATA_FLAGS);
3685 3686 3687
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3688 3689
	}

3690
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3691 3692
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3693
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3694
		goto failed_mount_wq;
3695 3696
	}

3697 3698 3699 3700
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3701
	}
3702

3703 3704 3705 3706 3707
	/* 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
3708 3709 3710
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3711 3712
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3713
			set_opt(sb, ORDERED_DATA);
3714
		else
3715
			set_opt(sb, JOURNAL_DATA);
3716 3717
		break;

3718 3719
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3720 3721
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3722 3723
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3724
			goto failed_mount_wq;
3725 3726 3727 3728
		}
	default:
		break;
	}
3729
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3730

B
Bobi Jam 已提交
3731 3732
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3733
no_journal:
3734 3735 3736 3737 3738 3739 3740 3741
	if (ext4_mballoc_ready) {
		sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
		if (!sbi->s_mb_cache) {
			ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
			goto failed_mount_wq;
		}
	}

3742 3743 3744 3745 3746 3747 3748 3749 3750
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) ||
	     EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) &&
	    (blocksize != PAGE_CACHE_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

	if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
3751 3752 3753 3754 3755 3756
	    !(sb->s_flags & MS_RDONLY) &&
	    !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
		ext4_commit_super(sb, 1);
	}

3757 3758 3759 3760 3761 3762 3763
	/*
	 * 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 {
3764 3765
		err = ext4_calculate_overhead(sb);
		if (err)
3766 3767 3768
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3769 3770 3771 3772
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3773 3774 3775 3776
	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");
3777
		ret = -ENOMEM;
3778 3779 3780
		goto failed_mount4;
	}

3781
	/*
3782
	 * The jbd2_journal_load will have done any necessary log recovery,
3783 3784 3785
	 * so we can safely mount the rest of the filesystem now.
	 */

3786 3787
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3788
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3789
		ret = PTR_ERR(root);
3790
		root = NULL;
3791 3792 3793
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3794
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
3795
		iput(root);
3796 3797
		goto failed_mount4;
	}
3798
	sb->s_root = d_make_root(root);
3799
	if (!sb->s_root) {
3800
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3801 3802 3803
		ret = -ENOMEM;
		goto failed_mount4;
	}
3804

3805 3806
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828

	/* determine the minimum size of new large inodes, if present */
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
		if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
			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;
3829 3830
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
3831 3832
	}

3833
	ext4_set_resv_clusters(sb);
L
Lukas Czerner 已提交
3834

3835 3836
	err = ext4_setup_system_zone(sb);
	if (err) {
3837
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
3838
			 "zone (%d)", err);
3839 3840 3841 3842 3843 3844 3845 3846
		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);
3847
		goto failed_mount5;
3848 3849
	}

3850 3851 3852
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
3853 3854
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
3855 3856 3857
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
3858 3859
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
3860 3861 3862
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
3863
					  ext4_count_dirs(sb), GFP_KERNEL);
3864
	if (!err)
3865 3866
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

3880 3881
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
3882
		goto failed_mount6;
3883

3884
	err = ext4_register_sysfs(sb);
3885 3886
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
3887

3888 3889 3890 3891 3892 3893 3894 3895 3896 3897
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
	    !(sb->s_flags & MS_RDONLY)) {
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

3898 3899 3900
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3901
	if (needs_recovery) {
3902
		ext4_msg(sb, KERN_INFO, "recovery complete");
3903 3904 3905 3906 3907 3908 3909 3910 3911 3912 3913 3914
		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";

3915 3916 3917 3918 3919 3920 3921 3922
	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");
	}

3923 3924 3925 3926
	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
		ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
			 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
			 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3927

3928 3929
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3930

3931 3932 3933 3934 3935
	/* 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);

3936
	kfree(orig_data);
3937 3938
	return 0;

3939
cantfind_ext4:
3940
	if (!silent)
3941
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3942 3943
	goto failed_mount;

3944 3945
#ifdef CONFIG_QUOTA
failed_mount8:
3946
	ext4_unregister_sysfs(sb);
3947
#endif
3948 3949 3950
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
3951
	ext4_mb_release(sb);
3952
	if (sbi->s_flex_groups)
A
Al Viro 已提交
3953
		kvfree(sbi->s_flex_groups);
3954 3955 3956 3957
	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);
3958
failed_mount5:
3959 3960 3961
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
3962
	dput(sb->s_root);
3963
	sb->s_root = NULL;
A
Al Viro 已提交
3964
failed_mount4:
3965
	ext4_msg(sb, KERN_ERR, "mount failed");
3966 3967
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
3968
failed_mount_wq:
3969 3970 3971 3972
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
3973
failed_mount3a:
3974
	ext4_es_unregister_shrinker(sbi);
3975
failed_mount3:
3976
	del_timer_sync(&sbi->s_err_report);
3977 3978
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
3979 3980 3981
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
A
Al Viro 已提交
3982
	kvfree(sbi->s_group_desc);
3983
failed_mount:
3984 3985
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
3986
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
3987
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
3988 3989
		kfree(sbi->s_qf_names[i]);
#endif
3990
	ext4_blkdev_remove(sbi);
3991 3992 3993
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
3994
	kfree(sbi->s_blockgroup_lock);
3995
	kfree(sbi);
3996
out_free_orig:
3997
	kfree(orig_data);
3998
	return err ? err : ret;
3999 4000 4001 4002 4003 4004 4005
}

/*
 * 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.
 */
4006
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4007
{
4008
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4009

4010 4011 4012
	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;
4013

4014
	write_lock(&journal->j_state_lock);
4015
	if (test_opt(sb, BARRIER))
4016
		journal->j_flags |= JBD2_BARRIER;
4017
	else
4018
		journal->j_flags &= ~JBD2_BARRIER;
4019 4020 4021 4022
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4023
	write_unlock(&journal->j_state_lock);
4024 4025
}

4026
static journal_t *ext4_get_journal(struct super_block *sb,
4027 4028 4029 4030 4031
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4032 4033
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4034 4035 4036 4037
	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

4038 4039
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4040
		ext4_msg(sb, KERN_ERR, "no journal found");
4041 4042 4043 4044 4045
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4046
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4047 4048 4049
		return NULL;
	}

4050
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4051
		  journal_inode, journal_inode->i_size);
4052
	if (!S_ISREG(journal_inode->i_mode)) {
4053
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4054 4055 4056 4057
		iput(journal_inode);
		return NULL;
	}

4058
	journal = jbd2_journal_init_inode(journal_inode);
4059
	if (!journal) {
4060
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4061 4062 4063 4064
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4065
	ext4_init_journal_params(sb, journal);
4066 4067 4068
	return journal;
}

4069
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4070 4071
				       dev_t j_dev)
{
4072
	struct buffer_head *bh;
4073
	journal_t *journal;
4074 4075
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4076
	int hblock, blocksize;
4077
	ext4_fsblk_t sb_block;
4078
	unsigned long offset;
4079
	struct ext4_super_block *es;
4080 4081
	struct block_device *bdev;

4082 4083
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4084
	bdev = ext4_blkdev_get(j_dev, sb);
4085 4086 4087 4088
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4089
	hblock = bdev_logical_block_size(bdev);
4090
	if (blocksize < hblock) {
4091 4092
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4093 4094 4095
		goto out_bdev;
	}

4096 4097
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4098 4099
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4100 4101
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4102 4103 4104
		goto out_bdev;
	}

4105
	es = (struct ext4_super_block *) (bh->b_data + offset);
4106
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4107
	    !(le32_to_cpu(es->s_feature_incompat) &
4108
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4109 4110
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4111 4112 4113 4114
		brelse(bh);
		goto out_bdev;
	}

4115 4116 4117 4118 4119 4120 4121 4122 4123
	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;
	}

4124
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4125
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4126 4127 4128 4129
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4130
	len = ext4_blocks_count(es);
4131 4132 4133
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4134
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4135 4136
					start, len, blocksize);
	if (!journal) {
4137
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4138 4139 4140
		goto out_bdev;
	}
	journal->j_private = sb;
4141
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4142 4143
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4144
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4145 4146 4147
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4148 4149
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4150 4151 4152
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4153 4154
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4155
	return journal;
4156

4157
out_journal:
4158
	jbd2_journal_destroy(journal);
4159
out_bdev:
4160
	ext4_blkdev_put(bdev);
4161 4162 4163
	return NULL;
}

4164 4165
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4166 4167 4168 4169 4170 4171 4172 4173
			     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;

4174 4175
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4176 4177
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4178 4179
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190
		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.
	 */
4191
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4192
		if (sb->s_flags & MS_RDONLY) {
4193 4194
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4195
			if (really_read_only) {
4196 4197
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4198 4199
				return -EROFS;
			}
4200 4201
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4202 4203 4204 4205
		}
	}

	if (journal_inum && journal_dev) {
4206 4207
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4208 4209 4210 4211
		return -EINVAL;
	}

	if (journal_inum) {
4212
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4213 4214
			return -EINVAL;
	} else {
4215
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4216 4217 4218
			return -EINVAL;
	}

4219
	if (!(journal->j_flags & JBD2_BARRIER))
4220
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4221

4222
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4223
		err = jbd2_journal_wipe(journal, !really_read_only);
4224 4225 4226 4227 4228
	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);
4229
		err = jbd2_journal_load(journal);
4230 4231 4232 4233 4234
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4235 4236

	if (err) {
4237
		ext4_msg(sb, KERN_ERR, "error loading journal");
4238
		jbd2_journal_destroy(journal);
4239 4240 4241
		return err;
	}

4242 4243
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4244

4245
	if (!really_read_only && journal_devnum &&
4246 4247 4248 4249
	    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. */
4250
		ext4_commit_super(sb, 1);
4251 4252 4253 4254 4255
	}

	return 0;
}

4256
static int ext4_commit_super(struct super_block *sb, int sync)
4257
{
4258
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4259
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4260
	int error = 0;
4261

4262
	if (!sbh || block_device_ejected(sb))
4263
		return error;
4264 4265 4266 4267 4268 4269 4270 4271 4272
	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.
		 */
4273 4274
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4275 4276 4277
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289
	/*
	 * 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());
4290 4291 4292
	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
4293 4294
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4295 4296 4297
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4298 4299
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4300 4301
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4302 4303 4304
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4305
				&EXT4_SB(sb)->s_freeinodes_counter));
4306
	BUFFER_TRACE(sbh, "marking dirty");
4307
	ext4_superblock_csum_set(sb);
4308
	mark_buffer_dirty(sbh);
4309
	if (sync) {
4310 4311
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4312 4313 4314 4315 4316
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4317 4318
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4319 4320 4321 4322
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4323
	return error;
4324 4325 4326 4327 4328 4329 4330
}

/*
 * 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.
 */
4331 4332
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4333
{
4334
	journal_t *journal = EXT4_SB(sb)->s_journal;
4335

4336 4337 4338 4339
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4340
	jbd2_journal_lock_updates(journal);
4341 4342 4343
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4344
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4345
	    sb->s_flags & MS_RDONLY) {
4346
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4347
		ext4_commit_super(sb, 1);
4348
	}
4349 4350

out:
4351
	jbd2_journal_unlock_updates(journal);
4352 4353 4354 4355 4356 4357 4358
}

/*
 * 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.
 */
4359 4360
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4361 4362 4363 4364 4365
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4366 4367
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4368
	journal = EXT4_SB(sb)->s_journal;
4369 4370 4371

	/*
	 * Now check for any error status which may have been recorded in the
4372
	 * journal by a prior ext4_error() or ext4_abort()
4373 4374
	 */

4375
	j_errno = jbd2_journal_errno(journal);
4376 4377 4378
	if (j_errno) {
		char nbuf[16];

4379
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4380
		ext4_warning(sb, "Filesystem error recorded "
4381
			     "from previous mount: %s", errstr);
4382
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4383

4384 4385
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4386
		ext4_commit_super(sb, 1);
4387

4388
		jbd2_journal_clear_err(journal);
4389
		jbd2_journal_update_sb_errno(journal);
4390 4391 4392 4393 4394 4395 4396
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4397
int ext4_force_commit(struct super_block *sb)
4398 4399 4400 4401 4402 4403
{
	journal_t *journal;

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

4404
	journal = EXT4_SB(sb)->s_journal;
4405
	return ext4_journal_force_commit(journal);
4406 4407
}

4408
static int ext4_sync_fs(struct super_block *sb, int wait)
4409
{
4410
	int ret = 0;
4411
	tid_t target;
4412
	bool needs_barrier = false;
4413
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4414

4415
	trace_ext4_sync_fs(sb, wait);
4416
	flush_workqueue(sbi->rsv_conversion_wq);
4417 4418 4419 4420 4421
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4422 4423 4424 4425 4426
	/*
	 * 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.
	 */
4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438
	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))
4439 4440 4441 4442 4443 4444
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4445
	}
4446 4447 4448 4449

	return ret;
}

4450 4451 4452
/*
 * 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.
4453 4454
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4455 4456
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4457
 */
4458
static int ext4_freeze(struct super_block *sb)
4459
{
4460 4461
	int error = 0;
	journal_t *journal;
4462

4463 4464
	if (sb->s_flags & MS_RDONLY)
		return 0;
4465

4466
	journal = EXT4_SB(sb)->s_journal;
4467

4468 4469 4470
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4471

4472 4473 4474 4475 4476 4477 4478
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4479 4480 4481

		/* Journal blocked and flushed, clear needs_recovery flag. */
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4482
	}
4483 4484

	error = ext4_commit_super(sb, 1);
4485
out:
4486 4487 4488
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4489
	return error;
4490 4491 4492 4493 4494 4495
}

/*
 * 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.
 */
4496
static int ext4_unfreeze(struct super_block *sb)
4497
{
4498 4499 4500
	if (sb->s_flags & MS_RDONLY)
		return 0;

4501 4502 4503 4504 4505
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	}

4506
	ext4_commit_super(sb, 1);
4507
	return 0;
4508 4509
}

4510 4511 4512 4513 4514
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4515
	unsigned long s_mount_opt2;
4516 4517
	kuid_t s_resuid;
	kgid_t s_resgid;
4518 4519 4520 4521
	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
4522
	char *s_qf_names[EXT4_MAXQUOTAS];
4523 4524 4525
#endif
};

4526
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4527
{
4528
	struct ext4_super_block *es;
4529
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4530
	unsigned long old_sb_flags;
4531
	struct ext4_mount_options old_opts;
4532
	int enable_quota = 0;
4533
	ext4_group_t g;
4534
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4535
	int err = 0;
4536
#ifdef CONFIG_QUOTA
4537
	int i, j;
4538
#endif
4539
	char *orig_data = kstrdup(data, GFP_KERNEL);
4540 4541 4542 4543

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4544
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4545 4546 4547
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4548 4549
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4550 4551
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4552
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4553 4554 4555 4556 4557 4558
		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]);
4559
				kfree(orig_data);
4560 4561 4562 4563
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4564
#endif
4565 4566
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4567

4568
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4569 4570 4571 4572
		err = -EINVAL;
		goto restore_opts;
	}

4573
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4574 4575
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4576 4577
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4578 4579
	}

4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
	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
4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			err = -EINVAL;
			goto restore_opts;
		}
	}

	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
		ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
			"dax flag with busy inodes while remounting");
		sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
4605 4606
	}

4607
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4608
		ext4_abort(sb, "Abort forced by user");
4609 4610

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4611
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4612 4613 4614

	es = sbi->s_es;

4615
	if (sbi->s_journal) {
4616
		ext4_init_journal_params(sb, sbi->s_journal);
4617 4618
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4619

4620 4621 4622
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4623
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4624
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4625 4626 4627 4628 4629
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4630 4631 4632
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4633 4634
			err = dquot_suspend(sb, -1);
			if (err < 0)
4635 4636
				goto restore_opts;

4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647
			/*
			 * 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.
			 */
4648 4649
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4650 4651
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4652
			if (sbi->s_journal)
4653
				ext4_mark_recovery_complete(sb, es);
4654
		} else {
4655
			/* Make sure we can mount this feature set readwrite */
D
Darrick J. Wong 已提交
4656 4657 4658
			if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_READONLY) ||
			    !ext4_feature_set_ok(sb, 0)) {
4659 4660 4661
				err = -EROFS;
				goto restore_opts;
			}
4662 4663
			/*
			 * Make sure the group descriptor checksums
4664
			 * are sane.  If they aren't, refuse to remount r/w.
4665 4666 4667 4668 4669
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4670
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4671 4672
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4673 4674
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
4675
					err = -EFSBADCRC;
4676 4677 4678 4679
					goto restore_opts;
				}
			}

4680 4681 4682 4683 4684 4685
			/*
			 * 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) {
4686
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4687 4688
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4689
				       "umount/remount instead");
4690 4691 4692 4693
				err = -EINVAL;
				goto restore_opts;
			}

4694 4695 4696 4697 4698 4699
			/*
			 * 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.)
			 */
4700 4701
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4702
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4703
			if (!ext4_setup_super(sb, es, 0))
4704
				sb->s_flags &= ~MS_RDONLY;
4705 4706 4707 4708 4709 4710 4711
			if (EXT4_HAS_INCOMPAT_FEATURE(sb,
						     EXT4_FEATURE_INCOMPAT_MMP))
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4712
			enable_quota = 1;
4713 4714
		}
	}
4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727

	/*
	 * 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);
	}

4728
	ext4_setup_system_zone(sb);
4729
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4730
		ext4_commit_super(sb, 1);
4731

4732 4733
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4734
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4735
		kfree(old_opts.s_qf_names[i]);
4736 4737 4738 4739 4740 4741
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
		else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_QUOTA)) {
			err = ext4_enable_quotas(sb);
4742
			if (err)
4743 4744 4745
				goto restore_opts;
		}
	}
4746
#endif
4747

4748
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4749 4750
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4751
	return 0;
4752

4753 4754 4755
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4756
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4757 4758 4759
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4760 4761
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4762 4763
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
4764
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
4765
		kfree(sbi->s_qf_names[i]);
4766 4767 4768
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4769
	kfree(orig_data);
4770 4771 4772
	return err;
}

4773
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4774 4775
{
	struct super_block *sb = dentry->d_sb;
4776 4777
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
4778
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
4779
	u64 fsid;
4780
	s64 bfree;
L
Lukas Czerner 已提交
4781
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4782

4783 4784
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4785

4786
	buf->f_type = EXT4_SUPER_MAGIC;
4787
	buf->f_bsize = sb->s_blocksize;
4788
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4789 4790
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4791
	/* prevent underflow in case that few free space is available */
4792
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
4793 4794 4795
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4796 4797
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
4798
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4799
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
4800 4801 4802 4803
	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;
4804

4805 4806 4807
	return 0;
}

4808 4809
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4810
 * Process 1                         Process 2
4811
 * ext4_create()                     quota_sync()
4812
 *   jbd2_journal_start()                  write_dquot()
4813
 *   dquot_initialize()                         down(dqio_mutex)
4814
 *     down(dqio_mutex)                    jbd2_journal_start()
4815 4816 4817 4818 4819 4820 4821
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4822
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4823 4824
}

4825
static int ext4_write_dquot(struct dquot *dquot)
4826 4827 4828 4829 4830 4831
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4832
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4833
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4834 4835 4836
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4837
	err = ext4_journal_stop(handle);
4838 4839 4840 4841 4842
	if (!ret)
		ret = err;
	return ret;
}

4843
static int ext4_acquire_dquot(struct dquot *dquot)
4844 4845 4846 4847
{
	int ret, err;
	handle_t *handle;

4848
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4849
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4850 4851 4852
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4853
	err = ext4_journal_stop(handle);
4854 4855 4856 4857 4858
	if (!ret)
		ret = err;
	return ret;
}

4859
static int ext4_release_dquot(struct dquot *dquot)
4860 4861 4862 4863
{
	int ret, err;
	handle_t *handle;

4864
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4865
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
4866 4867 4868
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4869
		return PTR_ERR(handle);
J
Jan Kara 已提交
4870
	}
4871
	ret = dquot_release(dquot);
4872
	err = ext4_journal_stop(handle);
4873 4874 4875 4876 4877
	if (!ret)
		ret = err;
	return ret;
}

4878
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4879
{
4880 4881 4882
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

4883
	/* Are we journaling quotas? */
4884 4885
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
4886
		dquot_mark_dquot_dirty(dquot);
4887
		return ext4_write_dquot(dquot);
4888 4889 4890 4891 4892
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

4893
static int ext4_write_info(struct super_block *sb, int type)
4894 4895 4896 4897 4898
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
4899
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
4900 4901 4902
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
4903
	err = ext4_journal_stop(handle);
4904 4905 4906 4907 4908 4909 4910 4911 4912
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
4913
static int ext4_quota_on_mount(struct super_block *sb, int type)
4914
{
4915 4916
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
4917 4918 4919 4920 4921
}

/*
 * Standard function to be called on quota_on
 */
4922
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
4923
			 struct path *path)
4924 4925 4926 4927 4928
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
4929

4930
	/* Quotafile not on the same filesystem? */
4931
	if (path->dentry->d_sb != sb)
4932
		return -EXDEV;
4933 4934
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
4935
		/* Quotafile not in fs root? */
4936
		if (path->dentry->d_parent != sb->s_root)
4937 4938 4939
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
4940
	}
4941 4942 4943 4944 4945

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
4946
	if (EXT4_SB(sb)->s_journal &&
4947
	    ext4_should_journal_data(d_inode(path->dentry))) {
4948 4949 4950 4951 4952
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
4953
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
4954
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4955
		if (err)
4956
			return err;
4957 4958
	}

4959
	return dquot_quota_on(sb, type, format_id, path);
4960 4961
}

4962 4963 4964 4965 4966
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
4967
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));

	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
4983 4984
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
4985 4986 4987 4988 4989 4990 4991 4992 4993 4994
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
J
Jan Kara 已提交
4995
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
4996 4997 4998 4999 5000
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5001
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5002 5003 5004 5005 5006
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5007 5008 5009
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5010 5011 5012 5013 5014 5015 5016
				return err;
			}
		}
	}
	return 0;
}

5017 5018
static int ext4_quota_off(struct super_block *sb, int type)
{
5019 5020 5021
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5022 5023 5024
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5025 5026
		sync_filesystem(sb);

5027 5028 5029
	if (!inode)
		goto out;

5030 5031
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5032
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5033 5034 5035 5036 5037 5038 5039
	if (IS_ERR(handle))
		goto out;
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext4_mark_inode_dirty(handle, inode);
	ext4_journal_stop(handle);

out:
5040 5041 5042
	return dquot_quota_off(sb, type);
}

5043 5044
/* 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
5045
 * itself serializes the operations (and no one else should touch the files)
5046
 * we don't have to be afraid of races */
5047
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5048 5049 5050
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5051
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065
	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;
5066 5067 5068
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083
		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) */
5084
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5085 5086 5087
				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
5088
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5089
	int err, offset = off & (sb->s_blocksize - 1);
5090
	int retries = 0;
5091 5092 5093
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5094
	if (EXT4_SB(sb)->s_journal && !handle) {
5095 5096
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5097 5098 5099
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110
	/*
	 * 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;
	}

5111 5112 5113 5114 5115 5116
	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));
5117 5118
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5119 5120
	if (!bh)
		goto out;
5121
	BUFFER_TRACE(bh, "get write access");
5122 5123 5124
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5125
		return err;
5126
	}
5127 5128 5129 5130
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5131
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5132
	brelse(bh);
5133
out:
5134 5135
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5136
		EXT4_I(inode)->i_disksize = inode->i_size;
5137
		ext4_mark_inode_dirty(handle, inode);
5138
	}
5139
	return len;
5140 5141 5142 5143
}

#endif

A
Al Viro 已提交
5144 5145
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5146
{
A
Al Viro 已提交
5147
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5148 5149
}

J
Jan Kara 已提交
5150
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162
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);
}
5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173

static inline int ext2_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5174 5175 5176
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5177
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191
#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);
}
5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204

static inline int ext3_feature_set_ok(struct super_block *sb)
{
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
		return 0;
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
		return 0;
	return 1;
}
5205

T
Theodore Ts'o 已提交
5206 5207 5208
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5209
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5210 5211 5212
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5213
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5214

5215 5216 5217 5218
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];

5219
static int __init ext4_init_fs(void)
5220
{
5221
	int i, err;
5222

5223
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5224 5225 5226
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5227
	/* Build-time check for flags consistency */
5228
	ext4_check_flag_values();
5229 5230 5231 5232 5233 5234

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

5235
	err = ext4_init_es();
5236 5237
	if (err)
		return err;
5238 5239 5240

	err = ext4_init_pageio();
	if (err)
5241
		goto out5;
5242

5243
	err = ext4_init_system_zone();
5244
	if (err)
5245
		goto out4;
5246

5247
	err = ext4_init_sysfs();
T
Theodore Ts'o 已提交
5248
	if (err)
5249
		goto out3;
5250

5251
	err = ext4_init_mballoc();
5252 5253
	if (err)
		goto out2;
5254 5255
	else
		ext4_mballoc_ready = 1;
5256 5257 5258
	err = init_inodecache();
	if (err)
		goto out1;
5259
	register_as_ext3();
5260
	register_as_ext2();
T
Theodore Ts'o 已提交
5261
	err = register_filesystem(&ext4_fs_type);
5262 5263
	if (err)
		goto out;
5264

5265 5266
	return 0;
out:
5267 5268
	unregister_as_ext2();
	unregister_as_ext3();
5269 5270
	destroy_inodecache();
out1:
5271
	ext4_mballoc_ready = 0;
5272
	ext4_exit_mballoc();
5273
out2:
5274 5275
	ext4_exit_sysfs();
out3:
5276
	ext4_exit_system_zone();
5277
out4:
5278
	ext4_exit_pageio();
5279
out5:
5280 5281
	ext4_exit_es();

5282 5283 5284
	return err;
}

5285
static void __exit ext4_exit_fs(void)
5286
{
5287
	ext4_exit_crypto();
5288
	ext4_destroy_lazyinit_thread();
5289 5290
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5291
	unregister_filesystem(&ext4_fs_type);
5292
	destroy_inodecache();
5293
	ext4_exit_mballoc();
5294
	ext4_exit_sysfs();
5295 5296
	ext4_exit_system_zone();
	ext4_exit_pageio();
5297
	ext4_exit_es();
5298 5299 5300
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5301
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5302
MODULE_LICENSE("GPL");
5303 5304
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)