super.c 157.9 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/jbd2.h>
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#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#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/proc_fs.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 proc_dir_entry *ext4_proc_root;
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static struct kset *ext4_kset;
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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
static struct ext4_features *ext4_feat;
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static int ext4_mballoc_ready;
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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_sync_fs_nojournal(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
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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#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
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)
#else
#define IS_EXT3_SB(sb) (0)
#endif
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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);
}

int ext4_superblock_csum_verify(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 == 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_RO_COMPAT_FEATURE(sb,
		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		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;
}

void ext4_kvfree(void *ptr)
{
	if (is_vmalloc_addr(ptr))
		vfree(ptr);
	else
		kfree(ptr);

}

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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;
	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 = bd_inode->i_mapping->backing_dev_info;

	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)) {
		path = d_path(&(file->f_path), pathname, sizeof(pathname));
		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) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
518 519
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
			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;
}

539
/* __ext4_std_error decodes expected errors from journaling functions
540 541
 * automatically and invokes the appropriate error response.  */

542 543
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
544 545 546 547 548 549 550 551 552 553 554
{
	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;

555 556 557 558 559
	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);
	}
560

561
	save_error_info(sb, function, line);
562
	ext4_handle_error(sb);
563 564 565
}

/*
566
 * ext4_abort is a much stronger failure handler than ext4_error.  The
567 568 569 570 571 572 573 574
 * 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.
 */

575
void __ext4_abort(struct super_block *sb, const char *function,
576
		unsigned int line, const char *fmt, ...)
577 578 579
{
	va_list args;

580
	save_error_info(sb, function, line);
581
	va_start(args, fmt);
582 583
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
584 585 586 587
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

588 589 590
	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;
591 592 593 594 595 596
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
597 598 599 600
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
601
	if (test_opt(sb, ERRORS_PANIC))
602
		panic("EXT4-fs panic from previous error\n");
603 604
}

605 606
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
607
{
J
Joe Perches 已提交
608
	struct va_format vaf;
609 610
	va_list args;

611 612 613
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

614
	va_start(args, fmt);
J
Joe Perches 已提交
615 616 617
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
618 619 620
	va_end(args);
}

621
void __ext4_warning(struct super_block *sb, const char *function,
622
		    unsigned int line, const char *fmt, ...)
623
{
J
Joe Perches 已提交
624
	struct va_format vaf;
625 626
	va_list args;

627 628 629 630
	if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
			  "EXT4-fs warning"))
		return;

631
	va_start(args, fmt);
J
Joe Perches 已提交
632 633 634 635
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
636 637 638
	va_end(args);
}

639 640 641 642
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, ...)
643 644 645
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
646
	struct va_format vaf;
647 648 649
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

650 651 652
	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
653

654 655 656 657 658 659 660 661 662 663 664 665 666 667
	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);
	}
668 669

	if (test_opt(sb, ERRORS_CONT)) {
670
		ext4_commit_super(sb, 0);
671 672
		return;
	}
673

674 675 676 677 678 679 680 681
	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
682
	 * ext4_grp_locked_error() to distinguish between the
683 684 685 686 687 688 689 690
	 * 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;
}

691
void ext4_update_dynamic_rev(struct super_block *sb)
692
{
693
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
694

695
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
696 697
		return;

698
	ext4_warning(sb,
699 700
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
701
		     EXT4_DYNAMIC_REV);
702

703 704 705
	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);
706 707 708 709 710 711 712 713 714 715 716 717 718
	/* 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
 */
719
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
720 721 722 723
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

724
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
725 726 727 728 729
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
730
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
731 732 733 734 735 736 737
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
738
static void ext4_blkdev_put(struct block_device *bdev)
739
{
A
Al Viro 已提交
740
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
741 742
}

A
Al Viro 已提交
743
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
744 745 746 747
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
748
		ext4_blkdev_put(bdev);
749 750 751 752 753 754
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
755
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
756 757
}

758
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
759 760 761
{
	struct list_head *l;

762 763
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
764 765 766 767 768 769 770 771 772 773 774 775

	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));
	}
}

776
static void ext4_put_super(struct super_block *sb)
777
{
778 779
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
780
	int i, err;
781

782
	ext4_unregister_li_request(sb);
783 784
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

785 786
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
787

788 789 790 791
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
792
			ext4_abort(sb, "Couldn't clean up the journal");
793
	}
794

795
	ext4_es_unregister_shrinker(sbi);
796
	del_timer_sync(&sbi->s_err_report);
797 798 799 800 801
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

802
	if (!(sb->s_flags & MS_RDONLY)) {
803
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
804 805
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
806
	if (!(sb->s_flags & MS_RDONLY))
807 808
		ext4_commit_super(sb, 1);

809
	if (sbi->s_proc) {
810
		remove_proc_entry("options", sbi->s_proc);
811
		remove_proc_entry(sb->s_id, ext4_proc_root);
812
	}
T
Theodore Ts'o 已提交
813
	kobject_del(&sbi->s_kobj);
814 815 816

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
817
	ext4_kvfree(sbi->s_group_desc);
818
	ext4_kvfree(sbi->s_flex_groups);
819
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
820 821
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
822
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
823
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		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));

838
	invalidate_bdev(sb->s_bdev);
839 840 841 842 843 844 845
	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);
846
		invalidate_bdev(sbi->journal_bdev);
847
		ext4_blkdev_remove(sbi);
848
	}
849 850 851 852
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
853 854
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
855
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
856 857 858 859 860 861
	/*
	 * 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);
862 863
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
864
	kfree(sbi->s_blockgroup_lock);
865 866 867
	kfree(sbi);
}

868
static struct kmem_cache *ext4_inode_cachep;
869 870 871 872

/*
 * Called inside transaction, so use GFP_NOFS
 */
873
static struct inode *ext4_alloc_inode(struct super_block *sb)
874
{
875
	struct ext4_inode_info *ei;
876

C
Christoph Lameter 已提交
877
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
878 879
	if (!ei)
		return NULL;
880

881
	ei->vfs_inode.i_version = 1;
882 883
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
884 885
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
886 887
	INIT_LIST_HEAD(&ei->i_es_lru);
	ei->i_es_lru_nr = 0;
888
	ei->i_touch_when = 0;
889 890 891
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
892
	ei->i_da_metadata_calc_len = 0;
893
	ei->i_da_metadata_calc_last_lblock = 0;
894
	spin_lock_init(&(ei->i_block_reservation_lock));
895 896 897
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
898
	ei->jinode = NULL;
899
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
900
	spin_lock_init(&ei->i_completed_io_lock);
901 902
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
903
	atomic_set(&ei->i_ioend_count, 0);
904
	atomic_set(&ei->i_unwritten, 0);
905
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
906

907 908 909
	return &ei->vfs_inode;
}

910 911 912 913 914 915 916 917
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
918 919 920 921 922 923
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));
}

924
static void ext4_destroy_inode(struct inode *inode)
925
{
926
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
927 928 929
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
930 931 932 933 934
		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
935
	call_rcu(&inode->i_rcu, ext4_i_callback);
936 937
}

938
static void init_once(void *foo)
939
{
940
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
941

C
Christoph Lameter 已提交
942 943
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
944
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
945
	inode_init_once(&ei->vfs_inode);
946 947
}

948
static int __init init_inodecache(void)
949
{
950 951
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
952 953
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
954
					     init_once);
955
	if (ext4_inode_cachep == NULL)
956 957 958 959 960 961
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
962 963 964 965 966
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
967
	kmem_cache_destroy(ext4_inode_cachep);
968 969
}

A
Al Viro 已提交
970
void ext4_clear_inode(struct inode *inode)
971
{
A
Al Viro 已提交
972
	invalidate_inode_buffers(inode);
973
	clear_inode(inode);
974
	dquot_drop(inode);
975
	ext4_discard_preallocations(inode);
976
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
977
	ext4_es_lru_del(inode);
978 979 980 981 982 983
	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;
	}
984 985
}

C
Christoph Hellwig 已提交
986
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
987
					u64 ino, u32 generation)
988 989 990
{
	struct inode *inode;

991
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
992
		return ERR_PTR(-ESTALE);
993
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
994 995 996 997
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
998
	 * ext4_read_inode will return a bad_inode if the inode had been
999 1000 1001 1002 1003
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1004 1005 1006 1007
	inode = ext4_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1008 1009 1010
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1011 1012 1013 1014 1015

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1016
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1017 1018 1019 1020 1021 1022
{
	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,
1023
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1024 1025 1026
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1027 1028
}

1029 1030 1031 1032 1033 1034
/*
 * 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.
 */
1035 1036
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
{
	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);
}

1049
#ifdef CONFIG_QUOTA
1050
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1051
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1052

1053 1054 1055 1056 1057
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);
1058
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1059
			 struct path *path);
1060 1061
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1062
static int ext4_quota_off(struct super_block *sb, int type);
1063
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1064 1065
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,
1066
			       size_t len, loff_t off);
1067
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1068
				const char *data, size_t len, loff_t off);
1069 1070 1071
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);
1072

1073
static const struct dquot_operations ext4_quota_operations = {
1074
	.get_reserved_space = ext4_get_reserved_space,
1075 1076 1077 1078
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1079 1080 1081
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1082 1083
};

1084
static const struct quotactl_ops ext4_qctl_operations = {
1085
	.quota_on	= ext4_quota_on,
1086
	.quota_off	= ext4_quota_off,
1087 1088 1089 1090 1091
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1092
};
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102

static const struct quotactl_ops ext4_qctl_sysfile_operations = {
	.quota_on_meta	= ext4_quota_on_sysfile,
	.quota_off	= ext4_quota_off_sysfile,
	.quota_sync	= dquot_quota_sync,
	.get_info	= dquot_get_dqinfo,
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
};
1103 1104
#endif

1105
static const struct super_operations ext4_sops = {
1106 1107 1108 1109
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1110
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1111
	.evict_inode	= ext4_evict_inode,
1112 1113
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1114 1115
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1116 1117 1118
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1119
#ifdef CONFIG_QUOTA
1120 1121
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1122
#endif
1123
	.bdev_try_to_free_page = bdev_try_to_free_page,
1124 1125
};

1126 1127 1128 1129 1130
static const struct super_operations ext4_nojournal_sops = {
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1131
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1132
	.evict_inode	= ext4_evict_inode,
1133
	.sync_fs	= ext4_sync_fs_nojournal,
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
	.put_super	= ext4_put_super,
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
#ifdef CONFIG_QUOTA
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
#endif
	.bdev_try_to_free_page = bdev_try_to_free_page,
};

1145
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1146 1147
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1148
	.get_parent = ext4_get_parent,
1149 1150 1151 1152 1153
};

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,
1154
	Opt_nouid32, Opt_debug, Opt_removed,
1155
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1156
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1157 1158
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1159
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1160
	Opt_data_err_abort, Opt_data_err_ignore,
1161
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1162
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1163
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1164
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1165 1166
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1167
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1168
	Opt_dioread_nolock, Opt_dioread_lock,
1169
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1170
	Opt_max_dir_size_kb,
1171 1172
};

1173
static const match_table_t tokens = {
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	{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"},
1188 1189
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1190 1191 1192 1193
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1194
	{Opt_noload, "norecovery"},
1195
	{Opt_noload, "noload"},
1196 1197
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1198
	{Opt_commit, "commit=%u"},
1199 1200
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1201
	{Opt_journal_dev, "journal_dev=%u"},
1202
	{Opt_journal_path, "journal_path=%s"},
1203 1204
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1205 1206 1207 1208
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1209 1210
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1211 1212 1213 1214 1215 1216
	{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
1217
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1218 1219 1220 1221 1222
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1223 1224
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1225
	{Opt_i_version, "i_version"},
1226
	{Opt_stripe, "stripe=%u"},
1227
	{Opt_delalloc, "delalloc"},
1228
	{Opt_nodelalloc, "nodelalloc"},
1229 1230
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1231 1232
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1233
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1234
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1235
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1236 1237
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1238 1239
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1240 1241
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1242 1243 1244
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1245
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1246 1247 1248 1249 1250
	{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
1251
	{Opt_err, NULL},
1252 1253
};

1254
static ext4_fsblk_t get_sb_block(void **data)
1255
{
1256
	ext4_fsblk_t	sb_block;
1257 1258 1259 1260
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1261

1262
	options += 3;
1263
	/* TODO: use simple_strtoll with >32bit ext4 */
1264 1265
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1266
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1267 1268 1269 1270 1271 1272
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1273

1274 1275 1276
	return sb_block;
}

1277
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1278 1279
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";
1280

D
Dmitry Monakhov 已提交
1281 1282 1283 1284 1285
#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;
1286
	int ret = -1;
D
Dmitry Monakhov 已提交
1287 1288 1289 1290 1291 1292

	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");
1293
		return -1;
D
Dmitry Monakhov 已提交
1294
	}
1295 1296 1297 1298 1299
	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
1300 1301 1302 1303
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1304
		return -1;
D
Dmitry Monakhov 已提交
1305
	}
1306 1307 1308 1309 1310 1311 1312 1313
	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
1314
	}
1315
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1316 1317
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1318
		goto errout;
D
Dmitry Monakhov 已提交
1319
	}
1320
	sbi->s_qf_names[qtype] = qname;
1321
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1322
	return 1;
1323 1324 1325
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
}

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");
1337
		return -1;
D
Dmitry Monakhov 已提交
1338
	}
1339
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1340 1341 1342 1343 1344
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1345 1346 1347 1348 1349 1350
#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
1351
#ifdef CONFIG_QUOTA
1352 1353 1354 1355 1356
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1357
#endif
1358
#define MOPT_DATAJ	0x0080
1359 1360 1361
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1362
#define MOPT_STRING	0x0400
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374

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},
1375 1376 1377 1378
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1379 1380
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1381 1382 1383
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1384
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1385 1386
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1387
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1388 1389 1390
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1391 1392 1393
	{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},
1394 1395 1396 1397
	{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},
1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408
	{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},
	{Opt_stripe, 0, MOPT_GTE0},
1409 1410 1411
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
1412
	{Opt_journal_path, 0, MOPT_STRING},
1413
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1414 1415 1416 1417
	{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},
1418 1419
	{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
1420
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1421 1422
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1423
#else
1424 1425
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1426
#endif
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	{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},
1443
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1444 1445 1446 1447 1448 1449 1450 1451 1452
	{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;
1453 1454
	kuid_t uid;
	kgid_t gid;
1455 1456
	int arg = 0;

1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
#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
1467
	switch (token) {
1468 1469 1470 1471
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1472 1473 1474
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1475
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1476 1477 1478 1479 1480 1481 1482 1483 1484
		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;
	}

1485 1486 1487 1488 1489 1490 1491 1492 1493 1494
	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;
	}

1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	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;
	}

1506
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1507 1508 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) {
		if (arg == 0)
			arg = EXT4_DEF_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 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
	} 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;
		}

		journal_inode = path.dentry->d_inode;
		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 1616 1617 1618 1619 1620
	} 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);
	} 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) {
1621
				ext4_msg(sb, KERN_ERR,
1622 1623
					 "Cannot change data mode on remount");
				return -1;
1624
			}
1625
		} else {
1626 1627
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1628
		}
1629 1630 1631 1632 1633 1634 1635 1636
#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;
		}
1637 1638 1639 1640 1641 1642 1643
		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;
		}
1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660
		sbi->s_jquota_fmt = m->mount_opt;
#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;
1661
	}
1662
	return 1;
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684
}

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.
		 */
1685
		args[0].to = args[0].from = NULL;
1686 1687 1688 1689
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1690 1691
	}
#ifdef CONFIG_QUOTA
1692 1693 1694 1695 1696 1697
	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;
	}
1698
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1699
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1700
			clear_opt(sb, USRQUOTA);
1701

1702
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1703
			clear_opt(sb, GRPQUOTA);
1704

D
Dmitry Monakhov 已提交
1705
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1706 1707
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1708 1709 1710 1711
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1712 1713
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1714 1715 1716 1717
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1718
			ext4_msg(sb, KERN_ERR, "journaled quota format "
1719
					"specified with no journaling "
1720
					"enabled");
1721 1722 1723 1724
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
	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;
		}
	}
1735 1736 1737
	return 1;
}

1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
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])
		seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);

	if (sbi->s_qf_names[GRPQUOTA])
		seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
#endif
}

1769 1770
static const char *token2str(int token)
{
1771
	const struct match_token *t;
1772 1773 1774 1775 1776 1777 1778

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

1779 1780 1781 1782 1783
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1784 1785
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1786 1787 1788
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1789
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1790
	const struct mount_opts *m;
1791
	char sep = nodefs ? '\n' : ',';
1792

1793 1794
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1795 1796

	if (sbi->s_sb_block != 1)
1797 1798 1799 1800 1801 1802 1803
		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;
1804
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1805 1806 1807 1808 1809 1810
			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));
1811
	}
1812

1813
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1814
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1815 1816 1817
		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)) ||
1818
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1819 1820
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1821
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1822 1823
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1824
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1825
		SEQ_OPTS_PUTS("errors=continue");
1826
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1827
		SEQ_OPTS_PUTS("errors=panic");
1828
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1829
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1830
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1831
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1832
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1833
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1834
	if (sb->s_flags & MS_I_VERSION)
1835
		SEQ_OPTS_PUTS("i_version");
1836
	if (nodefs || sbi->s_stripe)
1837
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1838
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1839 1840 1841 1842 1843 1844 1845
		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");
	}
1846 1847
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1848 1849
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1850

1851 1852
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1853
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1854 1855
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1856 1857 1858 1859 1860

	ext4_show_quota_options(seq, sb);
	return 0;
}

1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 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);
}

static int options_seq_show(struct seq_file *seq, void *offset)
{
	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;
}

static int options_open_fs(struct inode *inode, struct file *file)
{
A
Al Viro 已提交
1879
	return single_open(file, options_seq_show, PDE_DATA(inode));
1880 1881 1882 1883 1884 1885 1886 1887 1888 1889
}

static const struct file_operations ext4_seq_options_fops = {
	.owner = THIS_MODULE,
	.open = options_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

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 1972 1973 1974 1975 1976 1977 1978
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)));
		ext4_kvfree(sbi->s_flex_groups);
	}
	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 2021 2022
	if ((sbi->s_es->s_feature_ro_compat &
	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
		/* Use new metadata_csum algorithm */
2023
		__le16 save_csum;
2024 2025
		__u32 csum32;

2026
		save_csum = gdp->bg_checksum;
2027 2028 2029 2030 2031
		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);
2032
		gdp->bg_checksum = save_csum;
2033 2034 2035

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2036 2037
	}

2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053
	/* old crc16 code */
	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
2054 2055 2056
	return cpu_to_le16(crc);
}

2057
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2058 2059
				struct ext4_group_desc *gdp)
{
2060 2061 2062
	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
2063 2064 2065 2066 2067
		return 0;

	return 1;
}

2068 2069 2070 2071 2072 2073 2074 2075
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);
}

2076
/* Called at mount-time, super-block is locked */
2077 2078
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2079
{
2080 2081 2082
	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
2083 2084 2085
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2086
	int flexbg_flag = 0;
2087
	ext4_group_t i, grp = sbi->s_groups_count;
2088

J
Jose R. Santos 已提交
2089 2090 2091
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2092
	ext4_debug("Checking group descriptors");
2093

2094 2095 2096
	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
2097
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2098
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2099 2100
		else
			last_block = first_block +
2101
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2102

2103 2104 2105 2106
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2107
		block_bitmap = ext4_block_bitmap(sb, gdp);
2108
		if (block_bitmap < first_block || block_bitmap > last_block) {
2109
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2110
			       "Block bitmap for group %u not in group "
2111
			       "(block %llu)!", i, block_bitmap);
2112 2113
			return 0;
		}
2114
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2115
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2116
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2117
			       "Inode bitmap for group %u not in group "
2118
			       "(block %llu)!", i, inode_bitmap);
2119 2120
			return 0;
		}
2121
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2122
		if (inode_table < first_block ||
2123
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2124
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2125
			       "Inode table for group %u not in group "
2126
			       "(block %llu)!", i, inode_table);
2127 2128
			return 0;
		}
2129
		ext4_lock_group(sb, i);
2130
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2131 2132 2133 2134
			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));
2135
			if (!(sb->s_flags & MS_RDONLY)) {
2136
				ext4_unlock_group(sb, i);
2137
				return 0;
2138
			}
A
Andreas Dilger 已提交
2139
		}
2140
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2141 2142
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2143
	}
2144 2145
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2146

2147 2148
	ext4_free_blocks_count_set(sbi->s_es,
				   EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2149
	sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2150 2151 2152
	return 1;
}

2153
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
 * 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
2166
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2167 2168 2169
 * 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.
 */
2170 2171
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
{
	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;
	}

2183
	if (bdev_read_only(sb->s_bdev)) {
2184 2185
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2186 2187 2188
		return;
	}

2189 2190 2191 2192 2193 2194 2195
	/* 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;
	}

2196
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2197 2198
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2199 2200
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
2201 2202
			es->s_last_orphan = 0;
		}
2203 2204 2205 2206 2207
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2208
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2209 2210 2211 2212 2213 2214 2215
		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 */
	for (i = 0; i < MAXQUOTAS; i++) {
2216 2217
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2218
			if (ret < 0)
2219 2220 2221
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2222 2223 2224 2225 2226 2227 2228
		}
	}
#endif

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

2229 2230
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2231 2232 2233 2234
			es->s_last_orphan = 0;
			break;
		}

2235
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2236
		dquot_initialize(inode);
2237
		if (inode->i_nlink) {
2238 2239 2240 2241
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2242
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2243
				  inode->i_ino, inode->i_size);
2244
			mutex_lock(&inode->i_mutex);
2245
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2246
			ext4_truncate(inode);
2247
			mutex_unlock(&inode->i_mutex);
2248 2249
			nr_truncates++;
		} else {
2250 2251 2252 2253
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2254 2255 2256 2257 2258 2259 2260
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2261
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2262 2263

	if (nr_orphans)
2264 2265
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2266
	if (nr_truncates)
2267 2268
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2269 2270 2271 2272
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
2273
			dquot_quota_off(sb, i);
2274 2275 2276 2277
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2278

2279 2280 2281 2282 2283 2284 2285
/*
 * 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.
 *
2286 2287 2288 2289 2290 2291
 * 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.
 *
2292 2293
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2294
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2295 2296 2297 2298 2299
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2300
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2301
		/*
2302
		 * CONFIG_LBDAF is not enabled implies the inode
2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
		 * 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;
	}

2313 2314 2315 2316 2317 2318
	/*
	 * 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;
2319 2320 2321 2322 2323 2324 2325 2326
	res <<= blkbits;

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

	return res;
}
2327 2328

/*
2329
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2330 2331
 * 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.
2332
 */
2333
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2334
{
2335
	loff_t res = EXT4_NDIR_BLOCKS;
2336 2337
	int meta_blocks;
	loff_t upper_limit;
2338 2339 2340 2341 2342 2343
	/* 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.
2344 2345
	 */

2346
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2347
		/*
2348
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2349 2350
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2351 2352 2353 2354 2355 2356 2357
		 */
		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
2358 2359 2360 2361 2362 2363
		/*
		 * 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
		 */
2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376
		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;
2377 2378 2379 2380 2381 2382 2383

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2384 2385 2386 2387

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2388 2389 2390
	return res;
}

2391
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2392
				   ext4_fsblk_t logical_sb_block, int nr)
2393
{
2394
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2395
	ext4_group_t bg, first_meta_bg;
2396 2397 2398 2399
	int has_super = 0;

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

2400
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2401
	    nr < first_meta_bg)
2402
		return logical_sb_block + nr + 1;
2403
	bg = sbi->s_desc_per_block * nr;
2404
	if (ext4_bg_has_super(sb, bg))
2405
		has_super = 1;
2406

2407
	return (has_super + ext4_group_first_block_no(sb, bg));
2408 2409
}

2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
/**
 * 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
2426
	int ret;
2427 2428

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2429 2430 2431 2432 2433 2434 2435
		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;
2436

D
Dan Ehrenberg 已提交
2437 2438 2439 2440 2441 2442
	/*
	 * 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;
2443

D
Dan Ehrenberg 已提交
2444
	return ret;
2445
}
2446

T
Theodore Ts'o 已提交
2447 2448 2449 2450 2451
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2452
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2453
			 const char *, size_t);
2454 2455 2456 2457
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2458 2459
};

L
Lukas Czerner 已提交
2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470
static int parse_strtoull(const char *buf,
		unsigned long long max, unsigned long long *value)
{
	int ret;

	ret = kstrtoull(skip_spaces(buf), 0, value);
	if (!ret && *value > max)
		ret = -EINVAL;
	return ret;
}

T
Theodore Ts'o 已提交
2471 2472 2473 2474 2475
static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
					      struct ext4_sb_info *sbi,
					      char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2476 2477
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
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}

static ssize_t session_write_kbytes_show(struct ext4_attr *a,
					 struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2485 2486
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			 sbi->s_sectors_written_start) >> 1);
}

static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
					  struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

2497 2498
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%llu\n",
2500
			(unsigned long long)(sbi->s_kbytes_written +
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			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2502
			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
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}

static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
					  struct ext4_sb_info *sbi,
					  const char *buf, size_t count)
{
	unsigned long t;
2510
	int ret;
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2512 2513 2514
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2516
	if (t && (!is_power_of_2(t) || t > 0x40000000))
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		return -EINVAL;

	sbi->s_inode_readahead_blks = t;
	return count;
}

static ssize_t sbi_ui_show(struct ext4_attr *a,
2524
			   struct ext4_sb_info *sbi, char *buf)
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{
2526
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}

static ssize_t sbi_ui_store(struct ext4_attr *a,
			    struct ext4_sb_info *sbi,
			    const char *buf, size_t count)
{
2535
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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2536
	unsigned long t;
2537
	int ret;
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2538

2539 2540 2541
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2542 2543 2544 2545
	*ui = t;
	return count;
}

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static ssize_t reserved_clusters_show(struct ext4_attr *a,
				  struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%llu\n",
		(unsigned long long) atomic64_read(&sbi->s_resv_clusters));
}

static ssize_t reserved_clusters_store(struct ext4_attr *a,
				   struct ext4_sb_info *sbi,
				   const char *buf, size_t count)
{
	unsigned long long val;
	int ret;

	if (parse_strtoull(buf, -1ULL, &val))
		return -EINVAL;
	ret = ext4_reserve_clusters(sbi, val);

	return ret ? ret : count;
}

2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
static ssize_t trigger_test_error(struct ext4_attr *a,
				  struct ext4_sb_info *sbi,
				  const char *buf, size_t count)
{
	int len = count;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (len && buf[len-1] == '\n')
		len--;

	if (len)
		ext4_error(sbi->s_sb, "%.*s", len, buf);
	return count;
}

2584 2585 2586 2587 2588 2589
static ssize_t sbi_deprecated_show(struct ext4_attr *a,
				   struct ext4_sb_info *sbi, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
}

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#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show	= _show,					\
	.store	= _store,					\
2595 2596 2597
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
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}
#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)

2602
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
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#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
#define ATTR_LIST(name) &ext4_attr_##name.attr
2608 2609 2610 2611 2612 2613 2614 2615
#define EXT4_DEPRECATED_ATTR(_name, _val)	\
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = 0444 },	\
	.show	= sbi_deprecated_show,				\
	.u = {							\
		.deprecated_val = _val,				\
	},							\
}
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EXT4_RO_ATTR(delayed_allocation_blocks);
EXT4_RO_ATTR(session_write_kbytes);
EXT4_RO_ATTR(lifetime_write_kbytes);
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EXT4_RW_ATTR(reserved_clusters);
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EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
		 inode_readahead_blks_store, s_inode_readahead_blks);
2623
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
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EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2630
EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2631
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2632
EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2633 2634 2635 2636 2637 2638
EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
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static struct attribute *ext4_attrs[] = {
	ATTR_LIST(delayed_allocation_blocks),
	ATTR_LIST(session_write_kbytes),
	ATTR_LIST(lifetime_write_kbytes),
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2644
	ATTR_LIST(reserved_clusters),
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2645
	ATTR_LIST(inode_readahead_blks),
2646
	ATTR_LIST(inode_goal),
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	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
2653
	ATTR_LIST(max_writeback_mb_bump),
2654
	ATTR_LIST(extent_max_zeroout_kb),
2655
	ATTR_LIST(trigger_fs_error),
2656 2657 2658 2659 2660 2661
	ATTR_LIST(err_ratelimit_interval_ms),
	ATTR_LIST(err_ratelimit_burst),
	ATTR_LIST(warning_ratelimit_interval_ms),
	ATTR_LIST(warning_ratelimit_burst),
	ATTR_LIST(msg_ratelimit_interval_ms),
	ATTR_LIST(msg_ratelimit_burst),
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2662 2663 2664
	NULL,
};

2665 2666
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2667
EXT4_INFO_ATTR(batched_discard);
2668
EXT4_INFO_ATTR(meta_bg_resize);
2669 2670 2671

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2672
	ATTR_LIST(batched_discard),
2673
	ATTR_LIST(meta_bg_resize),
2674 2675 2676
	NULL,
};

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static ssize_t ext4_attr_show(struct kobject *kobj,
			      struct attribute *attr, char *buf)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->show ? a->show(a, sbi, buf) : 0;
}

static ssize_t ext4_attr_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buf, size_t len)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);

	return a->store ? a->store(a, sbi, buf, len) : 0;
}

static void ext4_sb_release(struct kobject *kobj)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	complete(&sbi->s_kobj_unregister);
}

2705
static const struct sysfs_ops ext4_attr_ops = {
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	.show	= ext4_attr_show,
	.store	= ext4_attr_store,
};

static struct kobj_type ext4_ktype = {
	.default_attrs	= ext4_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_sb_release,
};

2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_feat_release,
};

2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766
/*
 * 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;

	/* 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;
		}
	}
2767 2768 2769 2770 2771 2772 2773
	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;
	}
2774 2775 2776 2777 2778 2779 2780 2781 2782 2783

#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 */
2784 2785 2786
	return 1;
}

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 2826 2827 2828 2829 2830 2831 2832 2833
/*
 * 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)
		ext4_msg(sb, KERN_NOTICE, "error count: %u",
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
		       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) {
		printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
		       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 */
}

2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845
/* 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;

2846
	sb_start_write(sb);
2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857
	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;
	}

2858
	if (group >= ngroups)
2859 2860 2861 2862 2863 2864 2865
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2866 2867
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2868 2869 2870 2871 2872
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2873
	sb_end_write(sb);
2874 2875 2876 2877 2878 2879

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2880
 * request structure. Should be called with li_list_mtx held
2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897
 */
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)
{
2898 2899 2900
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2901
		return;
2902
	}
2903 2904

	mutex_lock(&ext4_li_info->li_list_mtx);
2905
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2906
	mutex_unlock(&ext4_li_info->li_list_mtx);
2907
	mutex_unlock(&ext4_li_mtx);
2908 2909
}

2910 2911
static struct task_struct *ext4_lazyinit_task;

2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925
/*
 * 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;
2926
	unsigned long next_wakeup, cur;
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943

	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);

2944 2945 2946 2947 2948 2949
			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;
				}
2950 2951 2952 2953 2954 2955 2956
			}

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

2957
		try_to_freeze();
2958

2959 2960
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2961
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2962 2963 2964 2965
			cond_resched();
			continue;
		}

2966 2967
		schedule_timeout_interruptible(next_wakeup - cur);

2968 2969 2970 2971
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013
	}

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)
{
3014 3015 3016 3017
	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);
3018 3019 3020
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
3021
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089
				 "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.
	 */
3090 3091
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3092 3093 3094
	return elr;
}

3095 3096
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3097 3098
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3099
	struct ext4_li_request *elr = NULL;
3100
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3101
	int ret = 0;
3102

3103
	mutex_lock(&ext4_li_mtx);
3104 3105 3106 3107 3108 3109
	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;
3110
		goto out;
3111
	}
3112 3113 3114

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3115
	    !test_opt(sb, INIT_INODE_TABLE))
3116
		goto out;
3117 3118

	elr = ext4_li_request_new(sb, first_not_zeroed);
3119 3120 3121 3122
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134

	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;
3135 3136 3137 3138 3139 3140
	/*
	 * 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;
3141 3142 3143 3144 3145 3146 3147

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3148 3149
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163
		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.
	 */
3164
	if (!ext4_li_info || !ext4_lazyinit_task)
3165 3166
		return;

3167
	kthread_stop(ext4_lazyinit_task);
3168 3169
}

3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
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);

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
		/* journal checksum v2 */
		compat = 0;
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

	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 {
		jbd2_journal_clear_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				JBD2_FEATURE_INCOMPAT_CSUM_V2);
	}

	return ret;
}

3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231
/*
 * 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;

3232 3233 3234 3235
	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);

3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312
	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;
	char *buf = (char *) get_zeroed_page(GFP_KERNEL);

	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();
	}
3313 3314
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3315
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3316

3317 3318 3319 3320 3321 3322
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3323

3324
static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3325 3326 3327
{
	ext4_fsblk_t resv_clusters;

3328 3329 3330 3331 3332 3333 3334 3335
	/*
	 * 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))
		return 0;
L
Lukas Czerner 已提交
3336 3337 3338 3339 3340 3341 3342 3343
	/*
	 * 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
	 * uninitialized extents in delalloc path. In most cases such
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3344 3345
	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
			EXT4_SB(sb)->s_cluster_bits;
L
Lukas Czerner 已提交
3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365

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

	return resv_clusters;
}


static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
{
	ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
				sbi->s_cluster_bits;

	if (count >= clusters)
		return -EINVAL;

	atomic64_set(&sbi->s_resv_clusters, count);
	return 0;
}

3366
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3367
{
3368
	char *orig_data = kstrdup(data, GFP_KERNEL);
3369
	struct buffer_head *bh;
3370 3371 3372 3373
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3374
	ext4_fsblk_t logical_sb_block;
3375 3376 3377 3378
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3379
	char *cp;
3380
	const char *descr;
3381
	int ret = -ENOMEM;
3382
	int blocksize, clustersize;
3383 3384
	unsigned int db_count;
	unsigned int i;
3385
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3386
	__u64 blocks_count;
3387
	int err = 0;
3388
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3389
	ext4_group_t first_not_zeroed;
3390 3391 3392

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3393
		goto out_free_orig;
3394 3395 3396 3397 3398

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3399
		goto out_free_orig;
3400
	}
3401
	sb->s_fs_info = sbi;
3402
	sbi->s_sb = sb;
3403
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3404
	sbi->s_sb_block = sb_block;
3405 3406 3407
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3408

3409 3410 3411 3412
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3413
	/* -EINVAL is default */
3414
	ret = -EINVAL;
3415
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3416
	if (!blocksize) {
3417
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3418 3419 3420 3421
		goto out_fail;
	}

	/*
3422
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3423 3424
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3425
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3426 3427
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3428
	} else {
3429
		logical_sb_block = sb_block;
3430 3431
	}

3432
	if (!(bh = sb_bread(sb, logical_sb_block))) {
3433
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3434 3435 3436 3437
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3438
	 *       some ext4 macro-instructions depend on its value
3439
	 */
3440
	es = (struct ext4_super_block *) (bh->b_data + offset);
3441 3442
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3443 3444
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3445
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3446

3447 3448 3449 3450 3451 3452 3453
	/* 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))
		ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
			     "redundant flags; please run fsck.");

3454 3455 3456 3457 3458 3459 3460 3461
	/* 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;
	}

3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473
	/* 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;
		}
	}

3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487
	/* 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;
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
			EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3488 3489
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3490
	set_opt(sb, INIT_INODE_TABLE);
3491
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3492
		set_opt(sb, DEBUG);
3493
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3494
		set_opt(sb, GRPID);
3495
	if (def_mount_opts & EXT4_DEFM_UID16)
3496
		set_opt(sb, NO_UID32);
3497 3498
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3499
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3500
	set_opt(sb, POSIX_ACL);
3501
#endif
3502
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3503
		set_opt(sb, JOURNAL_DATA);
3504
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3505
		set_opt(sb, ORDERED_DATA);
3506
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3507
		set_opt(sb, WRITEBACK_DATA);
3508 3509

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3510
		set_opt(sb, ERRORS_PANIC);
3511
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3512
		set_opt(sb, ERRORS_CONT);
3513
	else
3514
		set_opt(sb, ERRORS_RO);
3515
	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3516
		set_opt(sb, BLOCK_VALIDITY);
3517
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3518
		set_opt(sb, DISCARD);
3519

3520 3521
	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));
3522 3523 3524
	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;
3525

3526
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3527
		set_opt(sb, BARRIER);
3528

3529 3530 3531 3532
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3533
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3534
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3535
		set_opt(sb, DELALLOC);
3536

3537 3538 3539 3540 3541 3542
	/*
	 * 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;

3543
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3544
			   &journal_devnum, &journal_ioprio, 0)) {
3545 3546 3547 3548
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3549
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3550
	if (!parse_options((char *) data, sb, &journal_devnum,
3551
			   &journal_ioprio, 0))
3552 3553
		goto failed_mount;

3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564
	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 "
3565
				 "both data=journal and dioread_nolock");
3566 3567 3568 3569 3570 3571
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3572
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3573
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3574

3575 3576 3577 3578
	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)))
3579 3580 3581
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3582

3583 3584 3585 3586 3587 3588 3589 3590 3591 3592
	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;
		}
	}

3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614
	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;
		}
	}

3615 3616 3617 3618 3619
	/*
	 * 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.
	 */
3620
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3621
		goto failed_mount;
3622

J
Jan Kara 已提交
3623
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3624 3625
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3626 3627
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3628 3629 3630 3631
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3632 3633
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3634
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3635
					blocksize);
3636 3637 3638
			goto failed_mount;
		}

3639
		brelse(bh);
3640 3641 3642
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
		bh = sb_bread(sb, logical_sb_block);
3643
		if (!bh) {
3644 3645
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3646 3647
			goto failed_mount;
		}
3648
		es = (struct ext4_super_block *)(bh->b_data + offset);
3649
		sbi->s_es = es;
3650
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3651 3652
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3653 3654 3655 3656
			goto failed_mount;
		}
	}

3657 3658
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3659 3660 3661
	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);
3662

3663 3664 3665
	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;
3666 3667 3668
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3669
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3670
		    (!is_power_of_2(sbi->s_inode_size)) ||
3671
		    (sbi->s_inode_size > blocksize)) {
3672 3673
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3674
			       sbi->s_inode_size);
3675 3676
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3677 3678
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3679
	}
3680

3681 3682
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3683
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3684
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3685
		    !is_power_of_2(sbi->s_desc_size)) {
3686 3687
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3688 3689 3690 3691 3692
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3693

3694 3695
	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);
3696
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3697
		goto cantfind_ext4;
3698

3699
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3700
	if (sbi->s_inodes_per_block == 0)
3701
		goto cantfind_ext4;
3702 3703
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3704
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3705 3706
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3707 3708
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3709

3710
	for (i = 0; i < 4; i++)
3711 3712
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3713 3714 3715 3716 3717
	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) {
3718
#ifdef __CHAR_UNSIGNED__
3719 3720 3721 3722
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3723
#else
3724 3725 3726
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3727
#endif
3728
		}
3729
	}
3730

3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774
	/* 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;
3775
	}
3776 3777
	sbi->s_cluster_ratio = clustersize / blocksize;

3778
	if (sbi->s_inodes_per_group > blocksize * 8) {
3779 3780
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3781
		       sbi->s_inodes_per_group);
3782 3783 3784
		goto failed_mount;
	}

3785 3786 3787 3788
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3789 3790 3791 3792
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3793
	err = generic_check_addressable(sb->s_blocksize_bits,
3794
					ext4_blocks_count(es));
3795
	if (err) {
3796
		ext4_msg(sb, KERN_ERR, "filesystem"
3797
			 " too large to mount safely on this system");
3798
		if (sizeof(sector_t) < 8)
3799
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3800 3801 3802
		goto failed_mount;
	}

3803 3804
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3805

3806 3807 3808
	/* 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) {
3809 3810
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3811 3812 3813 3814
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3815 3816 3817 3818 3819
	/*
	 * 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)) {
3820
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3821 3822 3823
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3824 3825
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3826 3827 3828 3829
	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));
3830
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3831
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3832
		       "(block count %llu, first data block %u, "
3833
		       "blocks per group %lu)", sbi->s_groups_count,
3834 3835 3836 3837 3838
		       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
3839
	sbi->s_groups_count = blocks_count;
3840 3841
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3842 3843
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3844 3845 3846
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3847
	if (sbi->s_group_desc == NULL) {
3848
		ext4_msg(sb, KERN_ERR, "not enough memory");
3849
		ret = -ENOMEM;
3850 3851 3852
		goto failed_mount;
	}

3853 3854
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3855

3856 3857 3858 3859
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3860
	bgl_lock_init(sbi->s_blockgroup_lock);
3861 3862

	for (i = 0; i < db_count; i++) {
3863
		block = descriptor_loc(sb, logical_sb_block, i);
3864 3865
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
3866 3867
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3868 3869 3870 3871
			db_count = i;
			goto failed_mount2;
		}
	}
3872
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3873
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3874 3875
		goto failed_mount2;
	}
3876 3877
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
3878 3879 3880
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
3881 3882 3883
			goto failed_mount2;
		}

3884 3885 3886 3887
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3888 3889 3890 3891
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3892
	/* Register extent status tree shrinker */
3893
	ext4_es_register_shrinker(sbi);
3894

3895
	err = percpu_counter_init(&sbi->s_freeclusters_counter,
3896
			ext4_count_free_clusters(sb));
3897 3898 3899 3900 3901 3902 3903 3904 3905
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext4_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext4_count_dirs(sb));
	}
	if (!err) {
3906
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3907
	}
3908 3909 3910
	if (!err) {
		err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
	}
3911 3912 3913 3914 3915
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount3;
	}

3916
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3917
	sbi->s_extent_max_zeroout_kb = 32;
3918

3919 3920 3921
	/*
	 * set up enough so that it can read an inode
	 */
3922 3923 3924 3925 3926
	if (!test_opt(sb, NOLOAD) &&
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		sb->s_op = &ext4_sops;
	else
		sb->s_op = &ext4_nojournal_sops;
3927 3928
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3929
#ifdef CONFIG_QUOTA
3930
	sb->dq_op = &ext4_quota_operations;
3931
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3932
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3933 3934
	else
		sb->s_qcop = &ext4_qctl_operations;
3935
#endif
3936 3937
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3938
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3939
	mutex_init(&sbi->s_orphan_lock);
3940 3941 3942 3943

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3944 3945
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3946

3947 3948 3949 3950 3951
	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)))
			goto failed_mount3;

3952 3953 3954 3955 3956
	/*
	 * 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) &&
3957 3958
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3959
			goto failed_mount3;
3960 3961
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3962 3963
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3964
		goto failed_mount_wq;
3965
	} else {
3966
		clear_opt(sb, DATA_FLAGS);
3967 3968 3969
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3970 3971
	}

3972
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3973 3974
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3975
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3976
		goto failed_mount_wq;
3977 3978
	}

3979 3980 3981 3982
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3983
	}
3984

3985 3986 3987 3988 3989
	/* 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
3990 3991 3992
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3993 3994
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3995
			set_opt(sb, ORDERED_DATA);
3996
		else
3997
			set_opt(sb, JOURNAL_DATA);
3998 3999
		break;

4000 4001
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
4002 4003
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4004 4005
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
4006
			goto failed_mount_wq;
4007 4008 4009 4010
		}
	default:
		break;
	}
4011
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4012

B
Bobi Jam 已提交
4013 4014
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4015 4016 4017 4018
	/*
	 * The journal may have updated the bg summary counts, so we
	 * need to update the global counters.
	 */
4019
	percpu_counter_set(&sbi->s_freeclusters_counter,
4020
			   ext4_count_free_clusters(sb));
4021 4022 4023 4024
	percpu_counter_set(&sbi->s_freeinodes_counter,
			   ext4_count_free_inodes(sb));
	percpu_counter_set(&sbi->s_dirs_counter,
			   ext4_count_dirs(sb));
4025
	percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
4026

4027
no_journal:
4028 4029 4030 4031 4032 4033 4034 4035
	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;
		}
	}

4036 4037 4038 4039 4040 4041 4042
	/*
	 * 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 {
4043 4044
		err = ext4_calculate_overhead(sb);
		if (err)
4045 4046 4047
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4048 4049 4050 4051
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4052 4053 4054 4055
	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");
4056
		ret = -ENOMEM;
4057 4058 4059
		goto failed_mount4;
	}

4060
	/*
4061
	 * The jbd2_journal_load will have done any necessary log recovery,
4062 4063 4064
	 * so we can safely mount the rest of the filesystem now.
	 */

4065 4066
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4067
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4068
		ret = PTR_ERR(root);
4069
		root = NULL;
4070 4071 4072
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4073
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4074
		iput(root);
4075 4076
		goto failed_mount4;
	}
4077
	sb->s_root = d_make_root(root);
4078
	if (!sb->s_root) {
4079
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4080 4081 4082
		ret = -ENOMEM;
		goto failed_mount4;
	}
4083

4084 4085
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107

	/* 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;
4108 4109
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4110 4111
	}

4112
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4113 4114
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4115
			 "reserved pool", ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4116 4117 4118
		goto failed_mount4a;
	}

4119 4120
	err = ext4_setup_system_zone(sb);
	if (err) {
4121
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4122
			 "zone (%d)", err);
A
Al Viro 已提交
4123
		goto failed_mount4a;
4124 4125
	}

4126
	ext4_ext_init(sb);
4127
	err = ext4_mb_init(sb);
4128
	if (err) {
4129
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4130
			 err);
4131
		goto failed_mount5;
4132 4133
	}

4134 4135
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4136
		goto failed_mount6;
4137

T
Theodore Ts'o 已提交
4138 4139 4140 4141
	sbi->s_kobj.kset = ext4_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
				   "%s", sb->s_id);
4142 4143
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4144

4145 4146 4147 4148 4149 4150 4151 4152 4153 4154
#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 */

4155 4156 4157
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4158
	if (needs_recovery) {
4159
		ext4_msg(sb, KERN_INFO, "recovery complete");
4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171
		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";

4172 4173 4174 4175 4176 4177 4178 4179
	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");
	}

4180
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4181 4182
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4183

4184 4185
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4186

4187 4188 4189 4190 4191
	/* 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);

4192
	kfree(orig_data);
4193 4194
	return 0;

4195
cantfind_ext4:
4196
	if (!silent)
4197
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4198 4199
	goto failed_mount;

4200 4201 4202 4203
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4204 4205 4206 4207
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
	ext4_mb_release(sb);
A
Al Viro 已提交
4208 4209
failed_mount5:
	ext4_ext_release(sb);
4210
	ext4_release_system_zone(sb);
A
Al Viro 已提交
4211 4212
failed_mount4a:
	dput(sb->s_root);
4213
	sb->s_root = NULL;
A
Al Viro 已提交
4214
failed_mount4:
4215
	ext4_msg(sb, KERN_ERR, "mount failed");
4216 4217
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4218
failed_mount_wq:
4219 4220 4221 4222
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4223
failed_mount3:
4224
	ext4_es_unregister_shrinker(sbi);
4225
	del_timer_sync(&sbi->s_err_report);
4226 4227
	if (sbi->s_flex_groups)
		ext4_kvfree(sbi->s_flex_groups);
4228
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
4229 4230
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
4231
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4232
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4233 4234
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4235 4236 4237
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4238
	ext4_kvfree(sbi->s_group_desc);
4239
failed_mount:
4240 4241
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4242
	if (sbi->s_proc) {
4243
		remove_proc_entry("options", sbi->s_proc);
4244
		remove_proc_entry(sb->s_id, ext4_proc_root);
4245
	}
4246 4247 4248 4249
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
4250
	ext4_blkdev_remove(sbi);
4251 4252 4253
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4254
	kfree(sbi->s_blockgroup_lock);
4255
	kfree(sbi);
4256
out_free_orig:
4257
	kfree(orig_data);
4258
	return err ? err : ret;
4259 4260 4261 4262 4263 4264 4265
}

/*
 * 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.
 */
4266
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4267
{
4268
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4269

4270 4271 4272
	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;
4273

4274
	write_lock(&journal->j_state_lock);
4275
	if (test_opt(sb, BARRIER))
4276
		journal->j_flags |= JBD2_BARRIER;
4277
	else
4278
		journal->j_flags &= ~JBD2_BARRIER;
4279 4280 4281 4282
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4283
	write_unlock(&journal->j_state_lock);
4284 4285
}

4286
static journal_t *ext4_get_journal(struct super_block *sb,
4287 4288 4289 4290 4291
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4292 4293
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4294 4295 4296 4297
	/* 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. */

4298 4299
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4300
		ext4_msg(sb, KERN_ERR, "no journal found");
4301 4302 4303 4304 4305
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4306
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4307 4308 4309
		return NULL;
	}

4310
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4311
		  journal_inode, journal_inode->i_size);
4312
	if (!S_ISREG(journal_inode->i_mode)) {
4313
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4314 4315 4316 4317
		iput(journal_inode);
		return NULL;
	}

4318
	journal = jbd2_journal_init_inode(journal_inode);
4319
	if (!journal) {
4320
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4321 4322 4323 4324
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4325
	ext4_init_journal_params(sb, journal);
4326 4327 4328
	return journal;
}

4329
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4330 4331
				       dev_t j_dev)
{
4332
	struct buffer_head *bh;
4333
	journal_t *journal;
4334 4335
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4336
	int hblock, blocksize;
4337
	ext4_fsblk_t sb_block;
4338
	unsigned long offset;
4339
	struct ext4_super_block *es;
4340 4341
	struct block_device *bdev;

4342 4343
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4344
	bdev = ext4_blkdev_get(j_dev, sb);
4345 4346 4347 4348
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4349
	hblock = bdev_logical_block_size(bdev);
4350
	if (blocksize < hblock) {
4351 4352
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4353 4354 4355
		goto out_bdev;
	}

4356 4357
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4358 4359
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4360 4361
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4362 4363 4364
		goto out_bdev;
	}

4365
	es = (struct ext4_super_block *) (bh->b_data + offset);
4366
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4367
	    !(le32_to_cpu(es->s_feature_incompat) &
4368
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4369 4370
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4371 4372 4373 4374
		brelse(bh);
		goto out_bdev;
	}

4375
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4376
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4377 4378 4379 4380
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4381
	len = ext4_blocks_count(es);
4382 4383 4384
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4385
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4386 4387
					start, len, blocksize);
	if (!journal) {
4388
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4389 4390 4391
		goto out_bdev;
	}
	journal->j_private = sb;
4392
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4393 4394
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4395
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4396 4397 4398
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4399 4400
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4401 4402 4403
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4404 4405
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4406
	return journal;
4407

4408
out_journal:
4409
	jbd2_journal_destroy(journal);
4410
out_bdev:
4411
	ext4_blkdev_put(bdev);
4412 4413 4414
	return NULL;
}

4415 4416
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4417 4418 4419 4420 4421 4422 4423 4424
			     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;

4425 4426
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4427 4428
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4429 4430
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441
		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.
	 */
4442
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4443
		if (sb->s_flags & MS_RDONLY) {
4444 4445
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4446
			if (really_read_only) {
4447 4448
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4449 4450
				return -EROFS;
			}
4451 4452
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4453 4454 4455 4456
		}
	}

	if (journal_inum && journal_dev) {
4457 4458
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4459 4460 4461 4462
		return -EINVAL;
	}

	if (journal_inum) {
4463
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4464 4465
			return -EINVAL;
	} else {
4466
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4467 4468 4469
			return -EINVAL;
	}

4470
	if (!(journal->j_flags & JBD2_BARRIER))
4471
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4472

4473
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4474
		err = jbd2_journal_wipe(journal, !really_read_only);
4475 4476 4477 4478 4479
	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);
4480
		err = jbd2_journal_load(journal);
4481 4482 4483 4484 4485
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4486 4487

	if (err) {
4488
		ext4_msg(sb, KERN_ERR, "error loading journal");
4489
		jbd2_journal_destroy(journal);
4490 4491 4492
		return err;
	}

4493 4494
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4495

4496
	if (!really_read_only && journal_devnum &&
4497 4498 4499 4500
	    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. */
4501
		ext4_commit_super(sb, 1);
4502 4503 4504 4505 4506
	}

	return 0;
}

4507
static int ext4_commit_super(struct super_block *sb, int sync)
4508
{
4509
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4510
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4511
	int error = 0;
4512

4513
	if (!sbh || block_device_ejected(sb))
4514
		return error;
4515 4516 4517 4518 4519 4520 4521 4522 4523
	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.
		 */
4524 4525
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4526 4527 4528
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540
	/*
	 * 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());
4541 4542 4543
	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
4544 4545
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4546 4547 4548
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4549 4550 4551
	ext4_free_blocks_count_set(es,
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4552 4553 4554
	es->s_free_inodes_count =
		cpu_to_le32(percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeinodes_counter));
4555
	BUFFER_TRACE(sbh, "marking dirty");
4556
	ext4_superblock_csum_set(sb);
4557
	mark_buffer_dirty(sbh);
4558
	if (sync) {
4559 4560 4561 4562 4563 4564
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

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

/*
 * Have we just finished recovery?  If so, and if we are mounting (or
 * remounting) the filesystem readonly, then we will end up with a
 * consistent fs on disk.  Record that fact.
 */
4579 4580
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4581
{
4582
	journal_t *journal = EXT4_SB(sb)->s_journal;
4583

4584 4585 4586 4587
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4588
	jbd2_journal_lock_updates(journal);
4589 4590 4591
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4592
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4593
	    sb->s_flags & MS_RDONLY) {
4594
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4595
		ext4_commit_super(sb, 1);
4596
	}
4597 4598

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

/*
 * If we are mounting (or read-write remounting) a filesystem whose journal
 * has recorded an error from a previous lifetime, move that error to the
 * main filesystem now.
 */
4607 4608
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4609 4610 4611 4612 4613
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4614 4615
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

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

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

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

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

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

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

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

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

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

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

4663
	trace_ext4_sync_fs(sb, wait);
4664
	flush_workqueue(sbi->rsv_conversion_wq);
4665 4666 4667 4668 4669
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4670 4671 4672 4673 4674 4675 4676 4677 4678 4679
	/*
	 * 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.
	 */
	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;

4680
	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4681
		if (wait)
4682 4683 4684 4685 4686 4687 4688
			ret = jbd2_log_wait_commit(sbi->s_journal, target);
	}
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4689
	}
4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703

	return ret;
}

static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
{
	int ret = 0;

	trace_ext4_sync_fs(sb, wait);
	flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
	dquot_writeback_dquots(sb, -1);
	if (wait && test_opt(sb, BARRIER))
		ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);

4704
	return ret;
4705 4706 4707 4708 4709
}

/*
 * 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.
4710 4711
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4712 4713
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4714
 */
4715
static int ext4_freeze(struct super_block *sb)
4716
{
4717 4718
	int error = 0;
	journal_t *journal;
4719

4720 4721
	if (sb->s_flags & MS_RDONLY)
		return 0;
4722

4723
	journal = EXT4_SB(sb)->s_journal;
4724

4725 4726
	/* Now we set up the journal barrier. */
	jbd2_journal_lock_updates(journal);
4727

4728 4729 4730 4731 4732
	/*
	 * Don't clear the needs_recovery flag if we failed to flush
	 * the journal.
	 */
	error = jbd2_journal_flush(journal);
4733 4734
	if (error < 0)
		goto out;
4735 4736 4737 4738

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4739
out:
4740
	/* we rely on upper layer to stop further updates */
4741 4742
	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	return error;
4743 4744 4745 4746 4747 4748
}

/*
 * 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.
 */
4749
static int ext4_unfreeze(struct super_block *sb)
4750
{
4751 4752 4753 4754 4755 4756
	if (sb->s_flags & MS_RDONLY)
		return 0;

	/* Reset the needs_recovery flag before the fs is unlocked. */
	EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	ext4_commit_super(sb, 1);
4757
	return 0;
4758 4759
}

4760 4761 4762 4763 4764
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4765
	unsigned long s_mount_opt2;
4766 4767
	kuid_t s_resuid;
	kgid_t s_resgid;
4768 4769 4770 4771 4772 4773 4774 4775
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
	char *s_qf_names[MAXQUOTAS];
#endif
};

4776
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4777
{
4778
	struct ext4_super_block *es;
4779
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4780
	unsigned long old_sb_flags;
4781
	struct ext4_mount_options old_opts;
4782
	int enable_quota = 0;
4783
	ext4_group_t g;
4784
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4785
	int err = 0;
4786
#ifdef CONFIG_QUOTA
4787
	int i, j;
4788
#endif
4789
	char *orig_data = kstrdup(data, GFP_KERNEL);
4790 4791 4792 4793

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4794
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4795 4796 4797
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4798 4799
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4800 4801 4802
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
4803 4804 4805 4806 4807 4808
		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]);
4809
				kfree(orig_data);
4810 4811 4812 4813
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4814
#endif
4815 4816
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4817 4818 4819 4820

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4821
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4822 4823 4824 4825
		err = -EINVAL;
		goto restore_opts;
	}

4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			err = -EINVAL;
			goto restore_opts;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dioread_nolock");
			err = -EINVAL;
			goto restore_opts;
		}
	}

4841
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4842
		ext4_abort(sb, "Abort forced by user");
4843 4844

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4845
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4846 4847 4848

	es = sbi->s_es;

4849
	if (sbi->s_journal) {
4850
		ext4_init_journal_params(sb, sbi->s_journal);
4851 4852
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4853

4854
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4855
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4856 4857 4858 4859 4860
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4861 4862 4863
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4864 4865
			err = dquot_suspend(sb, -1);
			if (err < 0)
4866 4867
				goto restore_opts;

4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878
			/*
			 * 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.
			 */
4879 4880
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4881 4882
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4883
			if (sbi->s_journal)
4884
				ext4_mark_recovery_complete(sb, es);
4885
		} else {
4886 4887
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4888 4889 4890
				err = -EROFS;
				goto restore_opts;
			}
4891 4892
			/*
			 * Make sure the group descriptor checksums
4893
			 * are sane.  If they aren't, refuse to remount r/w.
4894 4895 4896 4897 4898
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4899
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4900 4901
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4902 4903 4904 4905 4906 4907 4908
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4909 4910 4911 4912 4913 4914
			/*
			 * 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) {
4915
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4916 4917
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4918
				       "umount/remount instead");
4919 4920 4921 4922
				err = -EINVAL;
				goto restore_opts;
			}

4923 4924 4925 4926 4927 4928
			/*
			 * 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.)
			 */
4929 4930
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4931
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4932
			if (!ext4_setup_super(sb, es, 0))
4933
				sb->s_flags &= ~MS_RDONLY;
4934 4935 4936 4937 4938 4939 4940
			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;
				}
4941
			enable_quota = 1;
4942 4943
		}
	}
4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956

	/*
	 * 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);
	}

4957
	ext4_setup_system_zone(sb);
4958
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4959
		ext4_commit_super(sb, 1);
4960

4961 4962 4963
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
4964
		kfree(old_opts.s_qf_names[i]);
4965 4966 4967 4968 4969 4970
	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);
4971
			if (err)
4972 4973 4974
				goto restore_opts;
		}
	}
4975
#endif
4976 4977 4978

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4979
	return 0;
4980

4981 4982 4983
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4984
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4985 4986 4987
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4988 4989
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4990 4991 4992
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
4993
		kfree(sbi->s_qf_names[i]);
4994 4995 4996
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4997
	kfree(orig_data);
4998 4999 5000
	return err;
}

5001
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5002 5003
{
	struct super_block *sb = dentry->d_sb;
5004 5005
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5006
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5007
	u64 fsid;
5008
	s64 bfree;
L
Lukas Czerner 已提交
5009
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5010

5011 5012
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5013

5014
	buf->f_type = EXT4_SUPER_MAGIC;
5015
	buf->f_bsize = sb->s_blocksize;
5016
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5017 5018
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5019
	/* prevent underflow in case that few free space is available */
5020
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5021 5022 5023
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5024 5025
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5026
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5027
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5028 5029 5030 5031
	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;
5032

5033 5034 5035
	return 0;
}

5036 5037
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5038
 * Process 1                         Process 2
5039
 * ext4_create()                     quota_sync()
5040
 *   jbd2_journal_start()                  write_dquot()
5041
 *   dquot_initialize()                         down(dqio_mutex)
5042
 *     down(dqio_mutex)                    jbd2_journal_start()
5043 5044 5045 5046 5047 5048 5049
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5050
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5051 5052
}

5053
static int ext4_write_dquot(struct dquot *dquot)
5054 5055 5056 5057 5058 5059
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5060
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5061
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5062 5063 5064
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5065
	err = ext4_journal_stop(handle);
5066 5067 5068 5069 5070
	if (!ret)
		ret = err;
	return ret;
}

5071
static int ext4_acquire_dquot(struct dquot *dquot)
5072 5073 5074 5075
{
	int ret, err;
	handle_t *handle;

5076
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5077
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5078 5079 5080
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5081
	err = ext4_journal_stop(handle);
5082 5083 5084 5085 5086
	if (!ret)
		ret = err;
	return ret;
}

5087
static int ext4_release_dquot(struct dquot *dquot)
5088 5089 5090 5091
{
	int ret, err;
	handle_t *handle;

5092
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5093
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5094 5095 5096
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5097
		return PTR_ERR(handle);
J
Jan Kara 已提交
5098
	}
5099
	ret = dquot_release(dquot);
5100
	err = ext4_journal_stop(handle);
5101 5102 5103 5104 5105
	if (!ret)
		ret = err;
	return ret;
}

5106
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5107
{
5108 5109 5110
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5111
	/* Are we journaling quotas? */
5112 5113
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5114
		dquot_mark_dquot_dirty(dquot);
5115
		return ext4_write_dquot(dquot);
5116 5117 5118 5119 5120
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5121
static int ext4_write_info(struct super_block *sb, int type)
5122 5123 5124 5125 5126
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5127
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5128 5129 5130
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5131
	err = ext4_journal_stop(handle);
5132 5133 5134 5135 5136 5137 5138 5139 5140
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5141
static int ext4_quota_on_mount(struct super_block *sb, int type)
5142
{
5143 5144
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5145 5146 5147 5148 5149
}

/*
 * Standard function to be called on quota_on
 */
5150
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5151
			 struct path *path)
5152 5153 5154 5155 5156
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5157

5158
	/* Quotafile not on the same filesystem? */
5159
	if (path->dentry->d_sb != sb)
5160
		return -EXDEV;
5161 5162
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5163
		/* Quotafile not in fs root? */
5164
		if (path->dentry->d_parent != sb->s_root)
5165 5166 5167
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5168
	}
5169 5170 5171 5172 5173

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5174
	if (EXT4_SB(sb)->s_journal &&
5175
	    ext4_should_journal_data(path->dentry->d_inode)) {
5176 5177 5178 5179 5180
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5181
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5182
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5183
		if (err)
5184
			return err;
5185 5186
	}

5187
	return dquot_quota_on(sb, type, format_id, path);
5188 5189
}

5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
	unsigned long qf_inums[MAXQUOTAS] = {
		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
5211 5212
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234
	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;
	unsigned long qf_inums[MAXQUOTAS] = {
		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;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5235 5236 5237
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259
				return err;
			}
		}
	}
	return 0;
}

/*
 * quota_on function that is used when QUOTA feature is set.
 */
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/*
	 * USAGE was enabled at mount time. Only need to enable LIMITS now.
	 */
	return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
}

5260 5261
static int ext4_quota_off(struct super_block *sb, int type)
{
5262 5263 5264
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5265 5266 5267
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5268 5269
		sync_filesystem(sb);

5270 5271 5272
	if (!inode)
		goto out;

5273 5274
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5275
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5276 5277 5278 5279 5280 5281 5282
	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:
5283 5284 5285
	return dquot_quota_off(sb, type);
}

5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297
/*
 * quota_off function that is used when QUOTA feature is set.
 */
static int ext4_quota_off_sysfile(struct super_block *sb, int type)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
		return -EINVAL;

	/* Disable only the limits. */
	return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
}

5298 5299
/* 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
5300
 * itself serializes the operations (and no one else should touch the files)
5301
 * we don't have to be afraid of races */
5302
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5303 5304 5305
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5306
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321
	int err = 0;
	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;
5322
		bh = ext4_bread(NULL, inode, blk, 0, &err);
5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339
		if (err)
			return err;
		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) */
5340
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5341 5342 5343
				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
5344
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5345 5346 5347 5348 5349
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5350
	if (EXT4_SB(sb)->s_journal && !handle) {
5351 5352
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5353 5354 5355
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369
	/*
	 * 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;
	}

	bh = ext4_bread(handle, inode, blk, 1, &err);
	if (!bh)
		goto out;
5370 5371 5372 5373
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
		goto out;
5374
	}
5375 5376 5377 5378
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5379
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5380
	brelse(bh);
5381
out:
5382
	if (err)
5383
		return err;
5384 5385
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5386
		EXT4_I(inode)->i_disksize = inode->i_size;
5387
		ext4_mark_inode_dirty(handle, inode);
5388
	}
5389
	return len;
5390 5391 5392 5393
}

#endif

A
Al Viro 已提交
5394 5395
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5396
{
A
Al Viro 已提交
5397
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5398 5399
}

5400
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412
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);
}
5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423

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;
}
5424 5425 5426
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5427
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5428 5429
#endif

5430
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442
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);
}
5443 5444 5445 5446 5447 5448 5449 5450 5451 5452 5453 5454 5455

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;
}
5456 5457 5458
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5459
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5460 5461
#endif

T
Theodore Ts'o 已提交
5462 5463 5464
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5465
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5466 5467 5468
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5469
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5470

5471
static int __init ext4_init_feat_adverts(void)
5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494
{
	struct ext4_features *ef;
	int ret = -ENOMEM;

	ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
	if (!ef)
		goto out;

	ef->f_kobj.kset = ext4_kset;
	init_completion(&ef->f_kobj_unregister);
	ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
				   "features");
	if (ret) {
		kfree(ef);
		goto out;
	}

	ext4_feat = ef;
	ret = 0;
out:
	return ret;
}

5495 5496 5497 5498 5499 5500 5501
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5502 5503 5504 5505
/* 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];

5506
static int __init ext4_init_fs(void)
5507
{
5508
	int i, err;
5509

5510 5511 5512
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5513
	/* Build-time check for flags consistency */
5514
	ext4_check_flag_values();
5515 5516 5517 5518 5519 5520

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

5521
	err = ext4_init_es();
5522 5523
	if (err)
		return err;
5524 5525 5526 5527 5528

	err = ext4_init_pageio();
	if (err)
		goto out7;

5529
	err = ext4_init_system_zone();
5530
	if (err)
5531
		goto out6;
T
Theodore Ts'o 已提交
5532
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5533 5534
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5535
		goto out5;
5536
	}
5537
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5538 5539

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5540 5541
	if (err)
		goto out4;
5542

5543
	err = ext4_init_mballoc();
5544 5545
	if (err)
		goto out2;
5546 5547
	else
		ext4_mballoc_ready = 1;
5548 5549 5550
	err = init_inodecache();
	if (err)
		goto out1;
5551
	register_as_ext3();
5552
	register_as_ext2();
T
Theodore Ts'o 已提交
5553
	err = register_filesystem(&ext4_fs_type);
5554 5555
	if (err)
		goto out;
5556

5557 5558
	return 0;
out:
5559 5560
	unregister_as_ext2();
	unregister_as_ext3();
5561 5562
	destroy_inodecache();
out1:
5563
	ext4_mballoc_ready = 0;
5564
	ext4_exit_mballoc();
5565
out2:
5566
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5567
out4:
5568 5569
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5570
	kset_unregister(ext4_kset);
5571
out5:
5572
	ext4_exit_system_zone();
5573
out6:
5574
	ext4_exit_pageio();
5575 5576 5577
out7:
	ext4_exit_es();

5578 5579 5580
	return err;
}

5581
static void __exit ext4_exit_fs(void)
5582
{
5583
	ext4_destroy_lazyinit_thread();
5584 5585
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5586
	unregister_filesystem(&ext4_fs_type);
5587
	destroy_inodecache();
5588
	ext4_exit_mballoc();
5589
	ext4_exit_feat_adverts();
5590
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5591
	kset_unregister(ext4_kset);
5592 5593
	ext4_exit_system_zone();
	ext4_exit_pageio();
5594
	ext4_exit_es();
5595 5596 5597
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5598
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5599
MODULE_LICENSE("GPL");
5600 5601
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)