super.c 158.4 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/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_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);
}

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

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

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

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	if (!ext4_has_metadata_csum(sb))
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		return;

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

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

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

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

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

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:
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		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
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			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

536
/* __ext4_std_error decodes expected errors from journaling functions
537 538
 * automatically and invokes the appropriate error response.  */

539 540
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
541 542 543 544 545 546 547 548 549 550 551
{
	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;

552 553 554 555 556
	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);
	}
557

558
	save_error_info(sb, function, line);
559
	ext4_handle_error(sb);
560 561 562
}

/*
563
 * ext4_abort is a much stronger failure handler than ext4_error.  The
564 565 566 567 568 569 570 571
 * 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.
 */

572
void __ext4_abort(struct super_block *sb, const char *function,
573
		unsigned int line, const char *fmt, ...)
574 575 576
{
	va_list args;

577
	save_error_info(sb, function, line);
578
	va_start(args, fmt);
579 580
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
581 582 583 584
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

585 586 587
	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;
588 589 590 591 592 593
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
594 595 596 597
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
598
	if (test_opt(sb, ERRORS_PANIC))
599
		panic("EXT4-fs panic from previous error\n");
600 601
}

602 603
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
604
{
J
Joe Perches 已提交
605
	struct va_format vaf;
606 607
	va_list args;

608 609 610
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

611
	va_start(args, fmt);
J
Joe Perches 已提交
612 613 614
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
615 616 617
	va_end(args);
}

618
void __ext4_warning(struct super_block *sb, const char *function,
619
		    unsigned int line, const char *fmt, ...)
620
{
J
Joe Perches 已提交
621
	struct va_format vaf;
622 623
	va_list args;

624 625 626 627
	if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
			  "EXT4-fs warning"))
		return;

628
	va_start(args, fmt);
J
Joe Perches 已提交
629 630 631 632
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
633 634 635
	va_end(args);
}

636 637 638 639
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, ...)
640 641 642
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
643
	struct va_format vaf;
644 645 646
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

647 648 649
	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
650

651 652 653 654 655 656 657 658 659 660 661 662 663 664
	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);
	}
665 666

	if (test_opt(sb, ERRORS_CONT)) {
667
		ext4_commit_super(sb, 0);
668 669
		return;
	}
670

671 672 673 674 675 676 677 678
	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
679
	 * ext4_grp_locked_error() to distinguish between the
680 681 682 683 684 685 686 687
	 * 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;
}

688
void ext4_update_dynamic_rev(struct super_block *sb)
689
{
690
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
691

692
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
693 694
		return;

695
	ext4_warning(sb,
696 697
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
698
		     EXT4_DYNAMIC_REV);
699

700 701 702
	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);
703 704 705 706 707 708 709 710 711 712 713 714 715
	/* 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
 */
716
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
717 718 719 720
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

721
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
722 723 724 725 726
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
727
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
728 729 730 731 732 733 734
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
735
static void ext4_blkdev_put(struct block_device *bdev)
736
{
A
Al Viro 已提交
737
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
738 739
}

A
Al Viro 已提交
740
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
741 742 743 744
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
745
		ext4_blkdev_put(bdev);
746 747 748 749 750 751
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
752
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
753 754
}

755
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
756 757 758
{
	struct list_head *l;

759 760
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
761 762 763 764 765 766 767 768 769 770 771 772

	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));
	}
}

773
static void ext4_put_super(struct super_block *sb)
774
{
775 776
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
777
	int i, err;
778

779
	ext4_unregister_li_request(sb);
780 781
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

782 783
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
784

785 786 787 788
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
789
			ext4_abort(sb, "Couldn't clean up the journal");
790
	}
791

792
	ext4_es_unregister_shrinker(sbi);
793
	del_timer_sync(&sbi->s_err_report);
794 795 796 797 798
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

799
	if (!(sb->s_flags & MS_RDONLY)) {
800
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
801 802
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
803
	if (!(sb->s_flags & MS_RDONLY))
804 805
		ext4_commit_super(sb, 1);

806
	if (sbi->s_proc) {
807
		remove_proc_entry("options", sbi->s_proc);
808
		remove_proc_entry(sb->s_id, ext4_proc_root);
809
	}
T
Theodore Ts'o 已提交
810
	kobject_del(&sbi->s_kobj);
811 812 813

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
814
	ext4_kvfree(sbi->s_group_desc);
815
	ext4_kvfree(sbi->s_flex_groups);
816
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
817 818
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
819
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
820 821
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
822
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
823 824 825 826 827 828 829 830 831 832 833
		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));

834
	invalidate_bdev(sb->s_bdev);
835 836 837 838 839 840 841
	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);
842
		invalidate_bdev(sbi->journal_bdev);
843
		ext4_blkdev_remove(sbi);
844
	}
845 846 847 848
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
849 850
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
851
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
852 853 854 855 856 857
	/*
	 * 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);
858 859
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
860
	kfree(sbi->s_blockgroup_lock);
861 862 863
	kfree(sbi);
}

864
static struct kmem_cache *ext4_inode_cachep;
865 866 867 868

/*
 * Called inside transaction, so use GFP_NOFS
 */
869
static struct inode *ext4_alloc_inode(struct super_block *sb)
870
{
871
	struct ext4_inode_info *ei;
872

C
Christoph Lameter 已提交
873
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
874 875
	if (!ei)
		return NULL;
876

877
	ei->vfs_inode.i_version = 1;
878
	spin_lock_init(&ei->i_raw_lock);
879 880
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
881 882
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
883
	INIT_LIST_HEAD(&ei->i_es_lru);
884
	ei->i_es_all_nr = 0;
885
	ei->i_es_lru_nr = 0;
886
	ei->i_touch_when = 0;
887 888 889
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
890
	ei->i_da_metadata_calc_len = 0;
891
	ei->i_da_metadata_calc_last_lblock = 0;
892
	spin_lock_init(&(ei->i_block_reservation_lock));
893 894 895
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
896
	ei->jinode = NULL;
897
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
898
	spin_lock_init(&ei->i_completed_io_lock);
899 900
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
901
	atomic_set(&ei->i_ioend_count, 0);
902
	atomic_set(&ei->i_unwritten, 0);
903
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
904

905 906 907
	return &ei->vfs_inode;
}

908 909 910 911 912 913 914 915
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
916 917 918 919 920 921
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));
}

922
static void ext4_destroy_inode(struct inode *inode)
923
{
924
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
925 926 927
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
928 929 930 931 932
		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
933
	call_rcu(&inode->i_rcu, ext4_i_callback);
934 935
}

936
static void init_once(void *foo)
937
{
938
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
939

C
Christoph Lameter 已提交
940 941
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
942
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
943
	inode_init_once(&ei->vfs_inode);
944 945
}

946
static int __init init_inodecache(void)
947
{
948 949
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
950 951
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
952
					     init_once);
953
	if (ext4_inode_cachep == NULL)
954 955 956 957 958 959
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
960 961 962 963 964
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
965
	kmem_cache_destroy(ext4_inode_cachep);
966 967
}

A
Al Viro 已提交
968
void ext4_clear_inode(struct inode *inode)
969
{
A
Al Viro 已提交
970
	invalidate_inode_buffers(inode);
971
	clear_inode(inode);
972
	dquot_drop(inode);
973
	ext4_discard_preallocations(inode);
974
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
975
	ext4_es_lru_del(inode);
976 977 978 979 980 981
	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;
	}
982 983
}

C
Christoph Hellwig 已提交
984
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
985
					u64 ino, u32 generation)
986 987 988
{
	struct inode *inode;

989
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
990
		return ERR_PTR(-ESTALE);
991
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
992 993 994 995
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
996
	 * ext4_read_inode will return a bad_inode if the inode had been
997 998 999 1000 1001
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1002
	inode = ext4_iget_normal(sb, ino);
1003 1004 1005
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1006 1007 1008
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1009 1010 1011 1012 1013

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1014
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1015 1016 1017 1018 1019 1020
{
	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,
1021
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1022 1023 1024
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1025 1026
}

1027 1028 1029 1030 1031 1032
/*
 * 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.
 */
1033 1034
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046
{
	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);
}

1047
#ifdef CONFIG_QUOTA
1048
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1049
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1050

1051 1052 1053 1054 1055
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);
1056
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1057
			 struct path *path);
1058 1059
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1060
static int ext4_quota_off(struct super_block *sb, int type);
1061
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1062 1063
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,
1064
			       size_t len, loff_t off);
1065
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1066
				const char *data, size_t len, loff_t off);
1067 1068 1069
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);
1070

1071
static const struct dquot_operations ext4_quota_operations = {
1072
	.get_reserved_space = ext4_get_reserved_space,
1073 1074 1075 1076
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1077 1078 1079
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1080 1081
};

1082
static const struct quotactl_ops ext4_qctl_operations = {
1083
	.quota_on	= ext4_quota_on,
1084
	.quota_off	= ext4_quota_off,
1085 1086 1087 1088 1089
	.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
1090
};
1091 1092 1093 1094 1095 1096 1097 1098 1099 1100

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
};
1101 1102
#endif

1103
static const struct super_operations ext4_sops = {
1104 1105 1106 1107
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1108
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1109
	.evict_inode	= ext4_evict_inode,
1110 1111
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1112 1113
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1114 1115 1116
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1117
#ifdef CONFIG_QUOTA
1118 1119
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1120
#endif
1121
	.bdev_try_to_free_page = bdev_try_to_free_page,
1122 1123
};

1124
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1125 1126
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1127
	.get_parent = ext4_get_parent,
1128 1129 1130 1131 1132
};

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,
1133
	Opt_nouid32, Opt_debug, Opt_removed,
1134
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1135
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1136 1137
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1138
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1139
	Opt_data_err_abort, Opt_data_err_ignore,
1140
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1141
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1142
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1143
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1144 1145
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1146
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1147
	Opt_dioread_nolock, Opt_dioread_lock,
1148
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1149
	Opt_max_dir_size_kb,
1150 1151
};

1152
static const match_table_t tokens = {
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
	{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"},
1167 1168
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1169 1170 1171 1172
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1173
	{Opt_noload, "norecovery"},
1174
	{Opt_noload, "noload"},
1175 1176
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1177
	{Opt_commit, "commit=%u"},
1178 1179
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1180
	{Opt_journal_dev, "journal_dev=%u"},
1181
	{Opt_journal_path, "journal_path=%s"},
1182 1183
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1184 1185 1186 1187
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1188 1189
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1190 1191 1192 1193 1194 1195
	{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
1196
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1197 1198 1199 1200 1201
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1202 1203
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1204
	{Opt_i_version, "i_version"},
1205
	{Opt_stripe, "stripe=%u"},
1206
	{Opt_delalloc, "delalloc"},
1207
	{Opt_nodelalloc, "nodelalloc"},
1208 1209
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1210 1211
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1212
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1213
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1214
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1215 1216
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1217 1218
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1219 1220
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1221 1222 1223
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1224
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1225 1226 1227 1228 1229
	{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
1230
	{Opt_err, NULL},
1231 1232
};

1233
static ext4_fsblk_t get_sb_block(void **data)
1234
{
1235
	ext4_fsblk_t	sb_block;
1236 1237 1238 1239
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1240

1241
	options += 3;
1242
	/* TODO: use simple_strtoll with >32bit ext4 */
1243 1244
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1245
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1246 1247 1248 1249 1250 1251
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1252

1253 1254 1255
	return sb_block;
}

1256
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1257 1258
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";
1259

D
Dmitry Monakhov 已提交
1260 1261 1262 1263 1264
#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;
1265
	int ret = -1;
D
Dmitry Monakhov 已提交
1266 1267 1268 1269 1270 1271

	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");
1272
		return -1;
D
Dmitry Monakhov 已提交
1273
	}
1274 1275 1276 1277 1278
	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
1279 1280 1281 1282
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1283
		return -1;
D
Dmitry Monakhov 已提交
1284
	}
1285 1286 1287 1288 1289 1290 1291 1292
	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
1293
	}
1294
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1295 1296
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1297
		goto errout;
D
Dmitry Monakhov 已提交
1298
	}
1299
	sbi->s_qf_names[qtype] = qname;
1300
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1301
	return 1;
1302 1303 1304
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
}

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");
1316
		return -1;
D
Dmitry Monakhov 已提交
1317
	}
1318
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1319 1320 1321 1322 1323
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1324 1325 1326 1327 1328 1329
#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
1330
#ifdef CONFIG_QUOTA
1331 1332 1333 1334 1335
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1336
#endif
1337
#define MOPT_DATAJ	0x0080
1338 1339 1340
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1341
#define MOPT_STRING	0x0400
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353

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},
1354 1355 1356 1357
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1358 1359
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1360 1361 1362
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1363
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1364 1365
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1366
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1367 1368 1369
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1370 1371 1372
	{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},
1373 1374 1375 1376
	{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},
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
	{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},
1388 1389 1390
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
1391
	{Opt_journal_path, 0, MOPT_STRING},
1392
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1393 1394 1395 1396
	{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},
1397 1398
	{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
1399
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1400 1401
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1402
#else
1403 1404
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1405
#endif
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
	{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},
1422
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1423 1424 1425 1426 1427 1428 1429 1430 1431
	{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;
1432 1433
	kuid_t uid;
	kgid_t gid;
1434 1435
	int arg = 0;

1436 1437 1438 1439 1440 1441 1442 1443 1444 1445
#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
1446
	switch (token) {
1447 1448 1449 1450
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1451 1452 1453
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1454
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1455 1456 1457 1458 1459 1460 1461 1462 1463
		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;
	}

1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
	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;
	}

1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
	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;
	}

1485
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
	if (m->flags & MOPT_EXPLICIT)
		set_opt2(sb, EXPLICIT_DELALLOC);
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1510 1511 1512 1513
		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");
1514
			return -1;
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
		}
		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);
1530 1531
			return -1;
		}
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546
		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;
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
	} 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);
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
	} 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) {
1598
				ext4_msg(sb, KERN_ERR,
1599 1600
					 "Cannot change data mode on remount");
				return -1;
1601
			}
1602
		} else {
1603 1604
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1605
		}
1606 1607 1608 1609 1610 1611 1612 1613
#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;
		}
1614 1615 1616 1617 1618 1619 1620
		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;
		}
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637
		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;
1638
	}
1639
	return 1;
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661
}

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.
		 */
1662
		args[0].to = args[0].from = NULL;
1663 1664 1665 1666
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1667 1668
	}
#ifdef CONFIG_QUOTA
1669 1670 1671 1672 1673 1674
	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;
	}
1675
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1676
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1677
			clear_opt(sb, USRQUOTA);
1678

1679
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1680
			clear_opt(sb, GRPQUOTA);
1681

D
Dmitry Monakhov 已提交
1682
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1683 1684
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1685 1686 1687 1688
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1689 1690
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1691 1692 1693 1694
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
	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;
		}
	}
1705 1706 1707
	return 1;
}

1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738
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
}

1739 1740
static const char *token2str(int token)
{
1741
	const struct match_token *t;
1742 1743 1744 1745 1746 1747 1748

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

1749 1750 1751 1752 1753
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1754 1755
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1756 1757 1758
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1759
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1760
	const struct mount_opts *m;
1761
	char sep = nodefs ? '\n' : ',';
1762

1763 1764
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1765 1766

	if (sbi->s_sb_block != 1)
1767 1768 1769 1770 1771 1772 1773
		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;
1774
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1775 1776 1777 1778 1779 1780
			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));
1781
	}
1782

1783
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1784
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1785 1786 1787
		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)) ||
1788
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1789 1790
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1791
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1792 1793
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1794
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1795
		SEQ_OPTS_PUTS("errors=continue");
1796
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1797
		SEQ_OPTS_PUTS("errors=panic");
1798
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1799
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1800
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1801
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1802
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1803
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1804
	if (sb->s_flags & MS_I_VERSION)
1805
		SEQ_OPTS_PUTS("i_version");
1806
	if (nodefs || sbi->s_stripe)
1807
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1808
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1809 1810 1811 1812 1813 1814 1815
		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");
	}
1816 1817
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1818 1819
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1820

1821 1822
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1823
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1824 1825
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1826 1827 1828 1829 1830

	ext4_show_quota_options(seq, sb);
	return 0;
}

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
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
1849
	return single_open(file, options_seq_show, PDE_DATA(inode));
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859
}

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,
};

1860
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1861 1862
			    int read_only)
{
1863
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1864 1865
	int res = 0;

1866
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1867 1868
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1869 1870 1871
		res = MS_RDONLY;
	}
	if (read_only)
1872
		goto done;
1873
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1874 1875
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1876
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1877 1878 1879
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1880
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1881 1882
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1883 1884 1885
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1886 1887 1888
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1889 1890 1891
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1892
	if (!sbi->s_journal)
1893
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1894
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1895
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1896
	le16_add_cpu(&es->s_mnt_count, 1);
1897
	es->s_mtime = cpu_to_le32(get_seconds());
1898
	ext4_update_dynamic_rev(sb);
1899 1900
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1901

1902
	ext4_commit_super(sb, 1);
1903
done:
1904
	if (test_opt(sb, DEBUG))
1905
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1906
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1907 1908
			sb->s_blocksize,
			sbi->s_groups_count,
1909 1910
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1911
			sbi->s_mount_opt, sbi->s_mount_opt2);
1912

D
Dan Magenheimer 已提交
1913
	cleancache_init_fs(sb);
1914 1915 1916
	return res;
}

1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
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;
}

1949 1950 1951 1952 1953
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;
1954
	int i, err;
1955

1956
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1957
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1958 1959 1960 1961
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1962 1963
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1964
		goto failed;
1965 1966

	for (i = 0; i < sbi->s_groups_count; i++) {
1967
		gdp = ext4_get_group_desc(sb, i, NULL);
1968 1969

		flex_group = ext4_flex_group(sbi, i);
1970 1971
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
1972 1973
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
1974 1975
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
1976 1977 1978 1979 1980 1981 1982
	}

	return 1;
failed:
	return 0;
}

1983 1984
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
1985
{
1986
	int offset;
A
Andreas Dilger 已提交
1987
	__u16 crc = 0;
1988
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
1989

1990
	if (ext4_has_metadata_csum(sbi->s_sb)) {
1991
		/* Use new metadata_csum algorithm */
1992
		__le16 save_csum;
1993 1994
		__u32 csum32;

1995
		save_csum = gdp->bg_checksum;
1996 1997 1998 1999 2000
		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);
2001
		gdp->bg_checksum = save_csum;
2002 2003 2004

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
2005 2006
	}

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
	/* 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
2023 2024 2025
	return cpu_to_le16(crc);
}

2026
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2027 2028
				struct ext4_group_desc *gdp)
{
2029 2030 2031
	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
2032 2033 2034 2035 2036
		return 0;

	return 1;
}

2037 2038 2039 2040 2041 2042 2043 2044
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);
}

2045
/* Called at mount-time, super-block is locked */
2046 2047
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2048
{
2049 2050 2051
	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
2052 2053 2054
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2055
	int flexbg_flag = 0;
2056
	ext4_group_t i, grp = sbi->s_groups_count;
2057

J
Jose R. Santos 已提交
2058 2059 2060
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2061
	ext4_debug("Checking group descriptors");
2062

2063 2064 2065
	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
2066
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2067
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2068 2069
		else
			last_block = first_block +
2070
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2071

2072 2073 2074 2075
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2076
		block_bitmap = ext4_block_bitmap(sb, gdp);
2077
		if (block_bitmap < first_block || block_bitmap > last_block) {
2078
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2079
			       "Block bitmap for group %u not in group "
2080
			       "(block %llu)!", i, block_bitmap);
2081 2082
			return 0;
		}
2083
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2084
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2085
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2086
			       "Inode bitmap for group %u not in group "
2087
			       "(block %llu)!", i, inode_bitmap);
2088 2089
			return 0;
		}
2090
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2091
		if (inode_table < first_block ||
2092
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2093
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2094
			       "Inode table for group %u not in group "
2095
			       "(block %llu)!", i, inode_table);
2096 2097
			return 0;
		}
2098
		ext4_lock_group(sb, i);
2099
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2100 2101 2102 2103
			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));
2104
			if (!(sb->s_flags & MS_RDONLY)) {
2105
				ext4_unlock_group(sb, i);
2106
				return 0;
2107
			}
A
Andreas Dilger 已提交
2108
		}
2109
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2110 2111
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2112
	}
2113 2114
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2115 2116 2117
	return 1;
}

2118
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
 * 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
2131
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2132 2133 2134
 * 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.
 */
2135 2136
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147
{
	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;
	}

2148
	if (bdev_read_only(sb->s_bdev)) {
2149 2150
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2151 2152 2153
		return;
	}

2154 2155 2156 2157 2158 2159 2160
	/* 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;
	}

2161
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2162 2163
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2164
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2165
				  "clearing orphan list.\n");
2166 2167
			es->s_last_orphan = 0;
		}
2168 2169 2170 2171 2172
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2173
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2174 2175 2176 2177 2178 2179
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
J
Jan Kara 已提交
2180
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2181 2182
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2183
			if (ret < 0)
2184 2185 2186
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2187 2188 2189 2190 2191 2192 2193
		}
	}
#endif

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

2194 2195
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2196 2197 2198 2199
			es->s_last_orphan = 0;
			break;
		}

2200
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2201
		dquot_initialize(inode);
2202
		if (inode->i_nlink) {
2203 2204 2205 2206
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2207
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2208
				  inode->i_ino, inode->i_size);
2209
			mutex_lock(&inode->i_mutex);
2210
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2211
			ext4_truncate(inode);
2212
			mutex_unlock(&inode->i_mutex);
2213 2214
			nr_truncates++;
		} else {
2215 2216 2217 2218
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2219 2220 2221 2222 2223 2224 2225
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2226
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2227 2228

	if (nr_orphans)
2229 2230
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2231
	if (nr_truncates)
2232 2233
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2234 2235
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2236
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2237
		if (sb_dqopt(sb)->files[i])
2238
			dquot_quota_off(sb, i);
2239 2240 2241 2242
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2243

2244 2245 2246 2247 2248 2249 2250
/*
 * 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.
 *
2251 2252 2253 2254 2255 2256
 * 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.
 *
2257 2258
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2259
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2260 2261 2262 2263 2264
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2265
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2266
		/*
2267
		 * CONFIG_LBDAF is not enabled implies the inode
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
		 * 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;
	}

2278 2279 2280 2281 2282 2283
	/*
	 * 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;
2284 2285 2286 2287 2288 2289 2290 2291
	res <<= blkbits;

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

	return res;
}
2292 2293

/*
2294
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2295 2296
 * 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.
2297
 */
2298
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2299
{
2300
	loff_t res = EXT4_NDIR_BLOCKS;
2301 2302
	int meta_blocks;
	loff_t upper_limit;
2303 2304 2305 2306 2307 2308
	/* 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.
2309 2310
	 */

2311
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2312
		/*
2313
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2314 2315
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2316 2317 2318 2319 2320 2321 2322
		 */
		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
2323 2324 2325 2326 2327 2328
		/*
		 * 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
		 */
2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341
		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;
2342 2343 2344 2345 2346 2347 2348

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2349 2350 2351 2352

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2353 2354 2355
	return res;
}

2356
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2357
				   ext4_fsblk_t logical_sb_block, int nr)
2358
{
2359
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2360
	ext4_group_t bg, first_meta_bg;
2361 2362 2363 2364
	int has_super = 0;

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

2365
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2366
	    nr < first_meta_bg)
2367
		return logical_sb_block + nr + 1;
2368
	bg = sbi->s_desc_per_block * nr;
2369
	if (ext4_bg_has_super(sb, bg))
2370
		has_super = 1;
2371

2372 2373 2374 2375 2376 2377 2378 2379 2380 2381
	/*
	 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
	 * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
	 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
	 * compensate.
	 */
	if (sb->s_blocksize == 1024 && nr == 0 &&
	    le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
		has_super++;

2382
	return (has_super + ext4_group_first_block_no(sb, bg));
2383 2384
}

2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
/**
 * 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
2401
	int ret;
2402 2403

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2404 2405 2406 2407 2408 2409 2410
		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;
2411

D
Dan Ehrenberg 已提交
2412 2413 2414 2415 2416 2417
	/*
	 * 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;
2418

D
Dan Ehrenberg 已提交
2419
	return ret;
2420
}
2421

T
Theodore Ts'o 已提交
2422 2423 2424 2425 2426
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2427
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2428
			 const char *, size_t);
2429 2430 2431 2432
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2433 2434
};

L
Lukas Czerner 已提交
2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445
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
2446 2447 2448 2449 2450
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",
2451 2452
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
T
Theodore Ts'o 已提交
2453 2454 2455 2456 2457 2458 2459
}

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;

2460 2461
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2462 2463 2464 2465 2466 2467 2468 2469 2470 2471
	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;

2472 2473
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2474
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2475
			(unsigned long long)(sbi->s_kbytes_written +
T
Theodore Ts'o 已提交
2476
			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2477
			  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;
2485
	int ret;
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2487 2488 2489
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2491
	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,
2499
			   struct ext4_sb_info *sbi, char *buf)
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{
2501
	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)
{
2510
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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2511
	unsigned long t;
2512
	int ret;
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2514 2515 2516
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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	*ui = t;
	return count;
}

2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
static ssize_t es_ui_show(struct ext4_attr *a,
			   struct ext4_sb_info *sbi, char *buf)
{

	unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
			   a->u.offset);

	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}

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2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551
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;
}

2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568
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;
}

2569 2570 2571 2572 2573 2574
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,					\
2580 2581 2582
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
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}
2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594

#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname)		\
static struct ext4_attr ext4_attr_##_name = {				\
	.attr = {.name = __stringify(_name), .mode = _mode },		\
	.show	= _show,						\
	.store	= _store,						\
	.u = {								\
		.offset = offsetof(struct ext4_super_block, _elname),	\
	},								\
}

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#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)

2598
#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)
2601 2602 2603

#define EXT4_RO_ATTR_ES_UI(name, elname)	\
	EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
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#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2606

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#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);
2639 2640 2641
EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
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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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2647
	ATTR_LIST(reserved_clusters),
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2648
	ATTR_LIST(inode_readahead_blks),
2649
	ATTR_LIST(inode_goal),
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2650 2651 2652 2653 2654 2655
	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),
2656
	ATTR_LIST(max_writeback_mb_bump),
2657
	ATTR_LIST(extent_max_zeroout_kb),
2658
	ATTR_LIST(trigger_fs_error),
2659 2660 2661 2662 2663 2664
	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),
2665 2666 2667
	ATTR_LIST(errors_count),
	ATTR_LIST(first_error_time),
	ATTR_LIST(last_error_time),
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2668 2669 2670
	NULL,
};

2671 2672
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2673
EXT4_INFO_ATTR(batched_discard);
2674
EXT4_INFO_ATTR(meta_bg_resize);
2675 2676 2677

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2678
	ATTR_LIST(batched_discard),
2679
	ATTR_LIST(meta_bg_resize),
2680 2681 2682
	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);
}

2711
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,
};

2722 2723 2724 2725 2726
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742
static ssize_t ext4_feat_show(struct kobject *kobj,
			      struct attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "supported\n");
}

/*
 * We can not use ext4_attr_show/store because it relies on the kobject
 * being embedded in the ext4_sb_info structure which is definitely not
 * true in this case.
 */
static const struct sysfs_ops ext4_feat_ops = {
	.show	= ext4_feat_show,
	.store	= NULL,
};

2743 2744
static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
2745
	.sysfs_ops	= &ext4_feat_ops,
2746 2747 2748
	.release	= ext4_feat_release,
};

2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788
/*
 * 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;
		}
	}
2789 2790 2791 2792 2793 2794 2795
	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;
	}
2796 2797 2798 2799 2800 2801 2802 2803 2804 2805

#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 */
2806 2807 2808
	return 1;
}

2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822
/*
 * 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)
2823 2824
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2825 2826
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2827
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840
		       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) {
2841
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
		       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 */
}

2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868
/* 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;

2869
	sb_start_write(sb);
2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880
	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;
	}

2881
	if (group >= ngroups)
2882 2883 2884 2885 2886 2887 2888
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2889 2890
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2891 2892 2893 2894 2895
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2896
	sb_end_write(sb);
2897 2898 2899 2900 2901 2902

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2903
 * request structure. Should be called with li_list_mtx held
2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920
 */
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)
{
2921 2922 2923
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2924
		return;
2925
	}
2926 2927

	mutex_lock(&ext4_li_info->li_list_mtx);
2928
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2929
	mutex_unlock(&ext4_li_info->li_list_mtx);
2930
	mutex_unlock(&ext4_li_mtx);
2931 2932
}

2933 2934
static struct task_struct *ext4_lazyinit_task;

2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948
/*
 * 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;
2949
	unsigned long next_wakeup, cur;
2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966

	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);

2967 2968 2969 2970 2971 2972
			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;
				}
2973 2974 2975 2976 2977 2978 2979
			}

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

2980
		try_to_freeze();
2981

2982 2983
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2984
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2985 2986 2987 2988
			cond_resched();
			continue;
		}

2989 2990
		schedule_timeout_interruptible(next_wakeup - cur);

2991 2992 2993 2994
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036
	}

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)
{
3037 3038 3039 3040
	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);
3041 3042 3043
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
3044
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
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 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112
				 "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.
	 */
3113 3114
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3115 3116 3117
	return elr;
}

3118 3119
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3120 3121
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3122
	struct ext4_li_request *elr = NULL;
3123
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3124
	int ret = 0;
3125

3126
	mutex_lock(&ext4_li_mtx);
3127 3128 3129 3130 3131 3132
	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;
3133
		goto out;
3134
	}
3135 3136 3137

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3138
	    !test_opt(sb, INIT_INODE_TABLE))
3139
		goto out;
3140 3141

	elr = ext4_li_request_new(sb, first_not_zeroed);
3142 3143 3144 3145
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157

	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;
3158 3159 3160 3161 3162 3163
	/*
	 * 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;
3164 3165 3166 3167 3168 3169 3170

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3171 3172
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186
		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.
	 */
3187
	if (!ext4_li_info || !ext4_lazyinit_task)
3188 3189
		return;

3190
	kthread_stop(ext4_lazyinit_task);
3191 3192
}

3193 3194 3195 3196 3197 3198
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);

3199
	if (ext4_has_metadata_csum(sb)) {
3200
		/* journal checksum v3 */
3201
		compat = 0;
3202
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3203 3204 3205 3206 3207 3208
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

3209 3210 3211 3212
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
	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 {
3225 3226
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3227 3228 3229 3230 3231
	}

	return ret;
}

3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
/*
 * 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;

3256 3257 3258 3259
	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);

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 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336
	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();
	}
3337 3338
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3339
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3340

3341 3342 3343 3344 3345 3346
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3347

3348
static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3349 3350 3351
{
	ext4_fsblk_t resv_clusters;

3352 3353 3354 3355 3356 3357 3358 3359
	/*
	 * 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
3360 3361 3362 3363
	/*
	 * 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
3364
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3365 3366 3367
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3368 3369
	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
			EXT4_SB(sb)->s_cluster_bits;
L
Lukas Czerner 已提交
3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389

	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;
}

3390
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3391
{
3392
	char *orig_data = kstrdup(data, GFP_KERNEL);
3393
	struct buffer_head *bh;
3394 3395 3396 3397
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3398
	ext4_fsblk_t logical_sb_block;
3399 3400 3401 3402
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3403
	char *cp;
3404
	const char *descr;
3405
	int ret = -ENOMEM;
3406
	int blocksize, clustersize;
3407 3408
	unsigned int db_count;
	unsigned int i;
3409
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3410
	__u64 blocks_count;
3411
	int err = 0;
3412
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3413
	ext4_group_t first_not_zeroed;
3414 3415 3416

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3417
		goto out_free_orig;
3418 3419 3420 3421 3422

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3423
		goto out_free_orig;
3424
	}
3425
	sb->s_fs_info = sbi;
3426
	sbi->s_sb = sb;
3427
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3428
	sbi->s_sb_block = sb_block;
3429 3430 3431
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3432

3433 3434 3435 3436
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3437
	/* -EINVAL is default */
3438
	ret = -EINVAL;
3439
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3440
	if (!blocksize) {
3441
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3442 3443 3444 3445
		goto out_fail;
	}

	/*
3446
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3447 3448
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3449
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3450 3451
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3452
	} else {
3453
		logical_sb_block = sb_block;
3454 3455
	}

3456
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3457
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3458 3459 3460 3461
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3462
	 *       some ext4 macro-instructions depend on its value
3463
	 */
3464
	es = (struct ext4_super_block *) (bh->b_data + offset);
3465 3466
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3467 3468
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3469
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3470

3471 3472 3473 3474 3475 3476 3477
	/* 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.");

3478 3479 3480 3481 3482 3483 3484 3485
	/* 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;
	}

3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497
	/* 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;
		}
	}

3498 3499 3500 3501 3502 3503 3504 3505 3506
	/* 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 */
3507
	if (ext4_has_metadata_csum(sb))
3508 3509 3510
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3511 3512
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3513
	set_opt(sb, INIT_INODE_TABLE);
3514
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3515
		set_opt(sb, DEBUG);
3516
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3517
		set_opt(sb, GRPID);
3518
	if (def_mount_opts & EXT4_DEFM_UID16)
3519
		set_opt(sb, NO_UID32);
3520 3521
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3522
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3523
	set_opt(sb, POSIX_ACL);
3524
#endif
3525
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3526
		set_opt(sb, JOURNAL_DATA);
3527
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3528
		set_opt(sb, ORDERED_DATA);
3529
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3530
		set_opt(sb, WRITEBACK_DATA);
3531 3532

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3533
		set_opt(sb, ERRORS_PANIC);
3534
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3535
		set_opt(sb, ERRORS_CONT);
3536
	else
3537
		set_opt(sb, ERRORS_RO);
3538 3539
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3540
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3541
		set_opt(sb, DISCARD);
3542

3543 3544
	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));
3545 3546 3547
	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;
3548

3549
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3550
		set_opt(sb, BARRIER);
3551

3552 3553 3554 3555
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3556
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3557
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3558
		set_opt(sb, DELALLOC);
3559

3560 3561 3562 3563 3564 3565
	/*
	 * 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;

3566
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3567
			   &journal_devnum, &journal_ioprio, 0)) {
3568 3569 3570 3571
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3572
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3573
	if (!parse_options((char *) data, sb, &journal_devnum,
3574
			   &journal_ioprio, 0))
3575 3576
		goto failed_mount;

3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587
	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 "
3588
				 "both data=journal and dioread_nolock");
3589 3590 3591 3592 3593 3594
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3595
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3596
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3597

3598 3599 3600 3601
	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)))
3602 3603 3604
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3605

3606 3607 3608 3609 3610 3611 3612 3613 3614 3615
	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;
		}
	}

3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637
	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;
		}
	}

3638 3639 3640 3641 3642
	/*
	 * 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.
	 */
3643
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3644
		goto failed_mount;
3645

J
Jan Kara 已提交
3646
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3647 3648
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3649 3650
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3651 3652 3653 3654
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3655 3656
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3657
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3658
					blocksize);
3659 3660 3661
			goto failed_mount;
		}

3662
		brelse(bh);
3663 3664
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3665
		bh = sb_bread_unmovable(sb, logical_sb_block);
3666
		if (!bh) {
3667 3668
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3669 3670
			goto failed_mount;
		}
3671
		es = (struct ext4_super_block *)(bh->b_data + offset);
3672
		sbi->s_es = es;
3673
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3674 3675
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3676 3677 3678 3679
			goto failed_mount;
		}
	}

3680 3681
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3682 3683 3684
	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);
3685

3686 3687 3688
	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;
3689 3690 3691
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3692
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3693
		    (!is_power_of_2(sbi->s_inode_size)) ||
3694
		    (sbi->s_inode_size > blocksize)) {
3695 3696
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3697
			       sbi->s_inode_size);
3698 3699
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3700 3701
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3702
	}
3703

3704 3705
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3706
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3707
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3708
		    !is_power_of_2(sbi->s_desc_size)) {
3709 3710
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3711 3712 3713 3714 3715
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3716

3717 3718
	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);
3719
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3720
		goto cantfind_ext4;
3721

3722
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3723
	if (sbi->s_inodes_per_block == 0)
3724
		goto cantfind_ext4;
3725 3726
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3727
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3728 3729
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3730 3731
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3732

3733
	for (i = 0; i < 4; i++)
3734 3735
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3736 3737 3738 3739 3740
	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) {
3741
#ifdef __CHAR_UNSIGNED__
3742 3743 3744 3745
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3746
#else
3747 3748 3749
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3750
#endif
3751
		}
3752
	}
3753

3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
	/* 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;
3798
	}
3799 3800
	sbi->s_cluster_ratio = clustersize / blocksize;

3801
	if (sbi->s_inodes_per_group > blocksize * 8) {
3802 3803
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3804
		       sbi->s_inodes_per_group);
3805 3806 3807
		goto failed_mount;
	}

3808 3809 3810 3811
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3812 3813 3814 3815
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3816
	err = generic_check_addressable(sb->s_blocksize_bits,
3817
					ext4_blocks_count(es));
3818
	if (err) {
3819
		ext4_msg(sb, KERN_ERR, "filesystem"
3820
			 " too large to mount safely on this system");
3821
		if (sizeof(sector_t) < 8)
3822
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3823 3824 3825
		goto failed_mount;
	}

3826 3827
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3828

3829 3830 3831
	/* 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) {
3832 3833
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3834 3835 3836 3837
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

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

3876 3877
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3878

3879 3880 3881 3882
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3883
	bgl_lock_init(sbi->s_blockgroup_lock);
3884 3885

	for (i = 0; i < db_count; i++) {
3886
		block = descriptor_loc(sb, logical_sb_block, i);
3887
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3888
		if (!sbi->s_group_desc[i]) {
3889 3890
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3891 3892 3893 3894
			db_count = i;
			goto failed_mount2;
		}
	}
3895
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3896
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3897
		goto failed_mount2;
3898
	}
3899

3900
	sbi->s_gdb_count = db_count;
3901 3902 3903
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3904 3905 3906 3907
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3908
	/* Register extent status tree shrinker */
3909
	if (ext4_es_register_shrinker(sbi))
3910 3911
		goto failed_mount3;

3912
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3913
	sbi->s_extent_max_zeroout_kb = 32;
3914

3915 3916 3917
	/*
	 * set up enough so that it can read an inode
	 */
3918
	sb->s_op = &ext4_sops;
3919 3920
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3921
#ifdef CONFIG_QUOTA
3922
	sb->dq_op = &ext4_quota_operations;
3923
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3924
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3925 3926
	else
		sb->s_qcop = &ext4_qctl_operations;
3927
#endif
3928 3929
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3930
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3931
	mutex_init(&sbi->s_orphan_lock);
3932 3933 3934 3935

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3936 3937
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3938

3939 3940 3941 3942 3943
	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;

3944 3945 3946 3947 3948
	/*
	 * 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) &&
3949 3950
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3951
			goto failed_mount3;
3952 3953
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3954 3955
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3956
		goto failed_mount_wq;
3957
	} else {
3958
		clear_opt(sb, DATA_FLAGS);
3959 3960 3961
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3962 3963
	}

3964
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3965 3966
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3967
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3968
		goto failed_mount_wq;
3969 3970
	}

3971 3972 3973 3974
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3975
	}
3976

3977 3978 3979 3980 3981
	/* 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
3982 3983 3984
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3985 3986
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3987
			set_opt(sb, ORDERED_DATA);
3988
		else
3989
			set_opt(sb, JOURNAL_DATA);
3990 3991
		break;

3992 3993
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3994 3995
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3996 3997
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3998
			goto failed_mount_wq;
3999 4000 4001 4002
		}
	default:
		break;
	}
4003
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4004

B
Bobi Jam 已提交
4005 4006
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4007
no_journal:
4008 4009 4010 4011 4012 4013 4014 4015
	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;
		}
	}

4016 4017 4018 4019 4020 4021 4022
	/*
	 * 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 {
4023 4024
		err = ext4_calculate_overhead(sb);
		if (err)
4025 4026 4027
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4028 4029 4030 4031
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4032 4033 4034 4035
	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");
4036
		ret = -ENOMEM;
4037 4038 4039
		goto failed_mount4;
	}

4040
	/*
4041
	 * The jbd2_journal_load will have done any necessary log recovery,
4042 4043 4044
	 * so we can safely mount the rest of the filesystem now.
	 */

4045 4046
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4047
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4048
		ret = PTR_ERR(root);
4049
		root = NULL;
4050 4051 4052
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4053
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4054
		iput(root);
4055 4056
		goto failed_mount4;
	}
4057
	sb->s_root = d_make_root(root);
4058
	if (!sb->s_root) {
4059
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4060 4061 4062
		ret = -ENOMEM;
		goto failed_mount4;
	}
4063

4064 4065
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087

	/* 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;
4088 4089
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4090 4091
	}

4092
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4093 4094
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4095
			 "reserved pool", ext4_calculate_resv_clusters(sb));
4096
		goto failed_mount4a;
L
Lukas Czerner 已提交
4097 4098
	}

4099 4100
	err = ext4_setup_system_zone(sb);
	if (err) {
4101
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4102
			 "zone (%d)", err);
4103 4104 4105 4106 4107 4108 4109 4110
		goto failed_mount4a;
	}

	ext4_ext_init(sb);
	err = ext4_mb_init(sb);
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
			 err);
4111
		goto failed_mount5;
4112 4113
	}

4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block);
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei);
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
					  ext4_count_dirs(sb));
	if (!err)
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

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

4141 4142
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4143
		goto failed_mount6;
4144

T
Theodore Ts'o 已提交
4145 4146 4147 4148
	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);
4149 4150
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4151

4152 4153 4154 4155 4156 4157 4158 4159 4160 4161
#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 */

4162 4163 4164
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4165
	if (needs_recovery) {
4166
		ext4_msg(sb, KERN_INFO, "recovery complete");
4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178
		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";

4179 4180 4181 4182 4183 4184 4185 4186
	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");
	}

4187
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4188 4189
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4190

4191 4192
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4193

4194 4195 4196 4197 4198
	/* 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);

4199
	kfree(orig_data);
4200 4201
	return 0;

4202
cantfind_ext4:
4203
	if (!silent)
4204
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4205 4206
	goto failed_mount;

4207 4208 4209 4210
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4211 4212 4213
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4214
	ext4_mb_release(sb);
4215 4216 4217 4218 4219 4220
	if (sbi->s_flex_groups)
		ext4_kvfree(sbi->s_flex_groups);
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4221
failed_mount5:
4222 4223 4224
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4225
	dput(sb->s_root);
4226
	sb->s_root = NULL;
A
Al Viro 已提交
4227
failed_mount4:
4228
	ext4_msg(sb, KERN_ERR, "mount failed");
4229 4230
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4231
failed_mount_wq:
4232 4233 4234 4235
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4236
	ext4_es_unregister_shrinker(sbi);
4237
failed_mount3:
4238
	del_timer_sync(&sbi->s_err_report);
4239 4240
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4241 4242 4243
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4244
	ext4_kvfree(sbi->s_group_desc);
4245
failed_mount:
4246 4247
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4248
	if (sbi->s_proc) {
4249
		remove_proc_entry("options", sbi->s_proc);
4250
		remove_proc_entry(sb->s_id, ext4_proc_root);
4251
	}
4252
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4253
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4254 4255
		kfree(sbi->s_qf_names[i]);
#endif
4256
	ext4_blkdev_remove(sbi);
4257 4258 4259
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4260
	kfree(sbi->s_blockgroup_lock);
4261
	kfree(sbi);
4262
out_free_orig:
4263
	kfree(orig_data);
4264
	return err ? err : ret;
4265 4266 4267 4268 4269 4270 4271
}

/*
 * 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.
 */
4272
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4273
{
4274
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4275

4276 4277 4278
	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;
4279

4280
	write_lock(&journal->j_state_lock);
4281
	if (test_opt(sb, BARRIER))
4282
		journal->j_flags |= JBD2_BARRIER;
4283
	else
4284
		journal->j_flags &= ~JBD2_BARRIER;
4285 4286 4287 4288
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4289
	write_unlock(&journal->j_state_lock);
4290 4291
}

4292
static journal_t *ext4_get_journal(struct super_block *sb,
4293 4294 4295 4296 4297
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4298 4299
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4300 4301 4302 4303
	/* 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. */

4304 4305
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4306
		ext4_msg(sb, KERN_ERR, "no journal found");
4307 4308 4309 4310 4311
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4312
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4313 4314 4315
		return NULL;
	}

4316
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4317
		  journal_inode, journal_inode->i_size);
4318
	if (!S_ISREG(journal_inode->i_mode)) {
4319
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4320 4321 4322 4323
		iput(journal_inode);
		return NULL;
	}

4324
	journal = jbd2_journal_init_inode(journal_inode);
4325
	if (!journal) {
4326
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4327 4328 4329 4330
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4331
	ext4_init_journal_params(sb, journal);
4332 4333 4334
	return journal;
}

4335
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4336 4337
				       dev_t j_dev)
{
4338
	struct buffer_head *bh;
4339
	journal_t *journal;
4340 4341
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4342
	int hblock, blocksize;
4343
	ext4_fsblk_t sb_block;
4344
	unsigned long offset;
4345
	struct ext4_super_block *es;
4346 4347
	struct block_device *bdev;

4348 4349
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4350
	bdev = ext4_blkdev_get(j_dev, sb);
4351 4352 4353 4354
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4355
	hblock = bdev_logical_block_size(bdev);
4356
	if (blocksize < hblock) {
4357 4358
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4359 4360 4361
		goto out_bdev;
	}

4362 4363
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4364 4365
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4366 4367
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4368 4369 4370
		goto out_bdev;
	}

4371
	es = (struct ext4_super_block *) (bh->b_data + offset);
4372
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4373
	    !(le32_to_cpu(es->s_feature_incompat) &
4374
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4375 4376
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4377 4378 4379 4380
		brelse(bh);
		goto out_bdev;
	}

4381 4382 4383 4384 4385 4386 4387 4388 4389
	if ((le32_to_cpu(es->s_feature_ro_compat) &
	     EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    es->s_checksum != ext4_superblock_csum(sb, es)) {
		ext4_msg(sb, KERN_ERR, "external journal has "
				       "corrupt superblock");
		brelse(bh);
		goto out_bdev;
	}

4390
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4391
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4392 4393 4394 4395
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4396
	len = ext4_blocks_count(es);
4397 4398 4399
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4400
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4401 4402
					start, len, blocksize);
	if (!journal) {
4403
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4404 4405 4406
		goto out_bdev;
	}
	journal->j_private = sb;
4407
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4408 4409
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4410
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4411 4412 4413
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4414 4415
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4416 4417 4418
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4419 4420
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4421
	return journal;
4422

4423
out_journal:
4424
	jbd2_journal_destroy(journal);
4425
out_bdev:
4426
	ext4_blkdev_put(bdev);
4427 4428 4429
	return NULL;
}

4430 4431
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4432 4433 4434 4435 4436 4437 4438 4439
			     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;

4440 4441
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4442 4443
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4444 4445
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456
		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.
	 */
4457
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4458
		if (sb->s_flags & MS_RDONLY) {
4459 4460
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4461
			if (really_read_only) {
4462 4463
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4464 4465
				return -EROFS;
			}
4466 4467
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4468 4469 4470 4471
		}
	}

	if (journal_inum && journal_dev) {
4472 4473
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4474 4475 4476 4477
		return -EINVAL;
	}

	if (journal_inum) {
4478
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4479 4480
			return -EINVAL;
	} else {
4481
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4482 4483 4484
			return -EINVAL;
	}

4485
	if (!(journal->j_flags & JBD2_BARRIER))
4486
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4487

4488
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4489
		err = jbd2_journal_wipe(journal, !really_read_only);
4490 4491 4492 4493 4494
	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);
4495
		err = jbd2_journal_load(journal);
4496 4497 4498 4499 4500
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4501 4502

	if (err) {
4503
		ext4_msg(sb, KERN_ERR, "error loading journal");
4504
		jbd2_journal_destroy(journal);
4505 4506 4507
		return err;
	}

4508 4509
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4510

4511
	if (!really_read_only && journal_devnum &&
4512 4513 4514 4515
	    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. */
4516
		ext4_commit_super(sb, 1);
4517 4518 4519 4520 4521
	}

	return 0;
}

4522
static int ext4_commit_super(struct super_block *sb, int sync)
4523
{
4524
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4525
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4526
	int error = 0;
4527

4528
	if (!sbh || block_device_ejected(sb))
4529
		return error;
4530 4531 4532 4533 4534 4535 4536 4537 4538
	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.
		 */
4539 4540
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4541 4542 4543
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555
	/*
	 * 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());
4556 4557 4558
	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
4559 4560
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4561 4562 4563
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4564 4565
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4566 4567
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4568 4569 4570
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4571
				&EXT4_SB(sb)->s_freeinodes_counter));
4572
	BUFFER_TRACE(sbh, "marking dirty");
4573
	ext4_superblock_csum_set(sb);
4574
	mark_buffer_dirty(sbh);
4575
	if (sync) {
4576 4577 4578 4579 4580 4581
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4582 4583
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4584 4585 4586 4587
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4588
	return error;
4589 4590 4591 4592 4593 4594 4595
}

/*
 * 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.
 */
4596 4597
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4598
{
4599
	journal_t *journal = EXT4_SB(sb)->s_journal;
4600

4601 4602 4603 4604
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4605
	jbd2_journal_lock_updates(journal);
4606 4607 4608
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4609
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4610
	    sb->s_flags & MS_RDONLY) {
4611
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4612
		ext4_commit_super(sb, 1);
4613
	}
4614 4615

out:
4616
	jbd2_journal_unlock_updates(journal);
4617 4618 4619 4620 4621 4622 4623
}

/*
 * 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.
 */
4624 4625
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4626 4627 4628 4629 4630
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4631 4632
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4633
	journal = EXT4_SB(sb)->s_journal;
4634 4635 4636

	/*
	 * Now check for any error status which may have been recorded in the
4637
	 * journal by a prior ext4_error() or ext4_abort()
4638 4639
	 */

4640
	j_errno = jbd2_journal_errno(journal);
4641 4642 4643
	if (j_errno) {
		char nbuf[16];

4644
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4645
		ext4_warning(sb, "Filesystem error recorded "
4646
			     "from previous mount: %s", errstr);
4647
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4648

4649 4650
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4651
		ext4_commit_super(sb, 1);
4652

4653
		jbd2_journal_clear_err(journal);
4654
		jbd2_journal_update_sb_errno(journal);
4655 4656 4657 4658 4659 4660 4661
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4662
int ext4_force_commit(struct super_block *sb)
4663 4664 4665 4666 4667 4668
{
	journal_t *journal;

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

4669
	journal = EXT4_SB(sb)->s_journal;
4670
	return ext4_journal_force_commit(journal);
4671 4672
}

4673
static int ext4_sync_fs(struct super_block *sb, int wait)
4674
{
4675
	int ret = 0;
4676
	tid_t target;
4677
	bool needs_barrier = false;
4678
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4679

4680
	trace_ext4_sync_fs(sb, wait);
4681
	flush_workqueue(sbi->rsv_conversion_wq);
4682 4683 4684 4685 4686
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4687 4688 4689 4690 4691
	/*
	 * 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.
	 */
4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
	if (sbi->s_journal) {
		target = jbd2_get_latest_transaction(sbi->s_journal);
		if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
		    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
			needs_barrier = true;

		if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
			if (wait)
				ret = jbd2_log_wait_commit(sbi->s_journal,
							   target);
		}
	} else if (wait && test_opt(sb, BARRIER))
4704 4705 4706 4707 4708 4709
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4710
	}
4711

4712
	return ret;
4713 4714 4715 4716 4717
}

/*
 * 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.
4718 4719
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4720 4721
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4722
 */
4723
static int ext4_freeze(struct super_block *sb)
4724
{
4725 4726
	int error = 0;
	journal_t *journal;
4727

4728 4729
	if (sb->s_flags & MS_RDONLY)
		return 0;
4730

4731
	journal = EXT4_SB(sb)->s_journal;
4732

4733 4734 4735
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4736

4737 4738 4739 4740 4741 4742 4743 4744
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
	}
4745 4746 4747 4748

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4749
out:
4750 4751 4752
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4753
	return error;
4754 4755 4756 4757 4758 4759
}

/*
 * 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.
 */
4760
static int ext4_unfreeze(struct super_block *sb)
4761
{
4762 4763 4764 4765 4766 4767
	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);
4768
	return 0;
4769 4770
}

4771 4772 4773 4774 4775
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4776
	unsigned long s_mount_opt2;
4777 4778
	kuid_t s_resuid;
	kgid_t s_resgid;
4779 4780 4781 4782
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
J
Jan Kara 已提交
4783
	char *s_qf_names[EXT4_MAXQUOTAS];
4784 4785 4786
#endif
};

4787
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4788
{
4789
	struct ext4_super_block *es;
4790
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4791
	unsigned long old_sb_flags;
4792
	struct ext4_mount_options old_opts;
4793
	int enable_quota = 0;
4794
	ext4_group_t g;
4795
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4796
	int err = 0;
4797
#ifdef CONFIG_QUOTA
4798
	int i, j;
4799
#endif
4800
	char *orig_data = kstrdup(data, GFP_KERNEL);
4801 4802 4803 4804

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4805
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4806 4807 4808
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4809 4810
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4811 4812
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4813
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4814 4815 4816 4817 4818 4819
		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]);
4820
				kfree(orig_data);
4821 4822 4823 4824
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4825
#endif
4826 4827
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4828 4829 4830 4831

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4832
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4833 4834 4835 4836
		err = -EINVAL;
		goto restore_opts;
	}

4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851
	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;
		}
	}

4852
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4853
		ext4_abort(sb, "Abort forced by user");
4854 4855

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4856
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4857 4858 4859

	es = sbi->s_es;

4860
	if (sbi->s_journal) {
4861
		ext4_init_journal_params(sb, sbi->s_journal);
4862 4863
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4864

4865
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4866
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4867 4868 4869 4870 4871
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4872 4873 4874
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4875 4876
			err = dquot_suspend(sb, -1);
			if (err < 0)
4877 4878
				goto restore_opts;

4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889
			/*
			 * 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.
			 */
4890 4891
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4892 4893
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4894
			if (sbi->s_journal)
4895
				ext4_mark_recovery_complete(sb, es);
4896
		} else {
4897 4898
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4899 4900 4901
				err = -EROFS;
				goto restore_opts;
			}
4902 4903
			/*
			 * Make sure the group descriptor checksums
4904
			 * are sane.  If they aren't, refuse to remount r/w.
4905 4906 4907 4908 4909
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4910
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4911 4912
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4913 4914 4915 4916 4917 4918 4919
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4920 4921 4922 4923 4924 4925
			/*
			 * 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) {
4926
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4927 4928
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4929
				       "umount/remount instead");
4930 4931 4932 4933
				err = -EINVAL;
				goto restore_opts;
			}

4934 4935 4936 4937 4938 4939
			/*
			 * 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.)
			 */
4940 4941
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4942
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4943
			if (!ext4_setup_super(sb, es, 0))
4944
				sb->s_flags &= ~MS_RDONLY;
4945 4946 4947 4948 4949 4950 4951
			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;
				}
4952
			enable_quota = 1;
4953 4954
		}
	}
4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967

	/*
	 * 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);
	}

4968
	ext4_setup_system_zone(sb);
4969
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4970
		ext4_commit_super(sb, 1);
4971

4972 4973
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
4974
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4975
		kfree(old_opts.s_qf_names[i]);
4976 4977 4978 4979 4980 4981
	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);
4982
			if (err)
4983 4984 4985
				goto restore_opts;
		}
	}
4986
#endif
4987 4988 4989

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4990
	return 0;
4991

4992 4993 4994
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4995
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4996 4997 4998
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4999 5000
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
5001 5002
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
5003
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5004
		kfree(sbi->s_qf_names[i]);
5005 5006 5007
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5008
	kfree(orig_data);
5009 5010 5011
	return err;
}

5012
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5013 5014
{
	struct super_block *sb = dentry->d_sb;
5015 5016
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5017
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5018
	u64 fsid;
5019
	s64 bfree;
L
Lukas Czerner 已提交
5020
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5021

5022 5023
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5024

5025
	buf->f_type = EXT4_SUPER_MAGIC;
5026
	buf->f_bsize = sb->s_blocksize;
5027
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5028 5029
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5030
	/* prevent underflow in case that few free space is available */
5031
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5032 5033 5034
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5035 5036
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5037
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5038
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5039 5040 5041 5042
	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;
5043

5044 5045 5046
	return 0;
}

5047 5048
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5049
 * Process 1                         Process 2
5050
 * ext4_create()                     quota_sync()
5051
 *   jbd2_journal_start()                  write_dquot()
5052
 *   dquot_initialize()                         down(dqio_mutex)
5053
 *     down(dqio_mutex)                    jbd2_journal_start()
5054 5055 5056 5057 5058 5059 5060
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5061
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5062 5063
}

5064
static int ext4_write_dquot(struct dquot *dquot)
5065 5066 5067 5068 5069 5070
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5071
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5072
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5073 5074 5075
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5076
	err = ext4_journal_stop(handle);
5077 5078 5079 5080 5081
	if (!ret)
		ret = err;
	return ret;
}

5082
static int ext4_acquire_dquot(struct dquot *dquot)
5083 5084 5085 5086
{
	int ret, err;
	handle_t *handle;

5087
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5088
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5089 5090 5091
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5092
	err = ext4_journal_stop(handle);
5093 5094 5095 5096 5097
	if (!ret)
		ret = err;
	return ret;
}

5098
static int ext4_release_dquot(struct dquot *dquot)
5099 5100 5101 5102
{
	int ret, err;
	handle_t *handle;

5103
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5104
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5105 5106 5107
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5108
		return PTR_ERR(handle);
J
Jan Kara 已提交
5109
	}
5110
	ret = dquot_release(dquot);
5111
	err = ext4_journal_stop(handle);
5112 5113 5114 5115 5116
	if (!ret)
		ret = err;
	return ret;
}

5117
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5118
{
5119 5120 5121
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5122
	/* Are we journaling quotas? */
5123 5124
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5125
		dquot_mark_dquot_dirty(dquot);
5126
		return ext4_write_dquot(dquot);
5127 5128 5129 5130 5131
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5132
static int ext4_write_info(struct super_block *sb, int type)
5133 5134 5135 5136 5137
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5138
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5139 5140 5141
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5142
	err = ext4_journal_stop(handle);
5143 5144 5145 5146 5147 5148 5149 5150 5151
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5152
static int ext4_quota_on_mount(struct super_block *sb, int type)
5153
{
5154 5155
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5156 5157 5158 5159 5160
}

/*
 * Standard function to be called on quota_on
 */
5161
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5162
			 struct path *path)
5163 5164 5165 5166 5167
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5168

5169
	/* Quotafile not on the same filesystem? */
5170
	if (path->dentry->d_sb != sb)
5171
		return -EXDEV;
5172 5173
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5174
		/* Quotafile not in fs root? */
5175
		if (path->dentry->d_parent != sb->s_root)
5176 5177 5178
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5179
	}
5180 5181 5182 5183 5184

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5185
	if (EXT4_SB(sb)->s_journal &&
5186
	    ext4_should_journal_data(path->dentry->d_inode)) {
5187 5188 5189 5190 5191
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5192
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5193
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5194
		if (err)
5195
			return err;
5196 5197
	}

5198
	return dquot_quota_on(sb, type, format_id, path);
5199 5200
}

5201 5202 5203 5204 5205
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
J
Jan Kara 已提交
5206
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221
		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
5222 5223
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5224 5225 5226 5227 5228 5229 5230 5231 5232 5233
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
J
Jan Kara 已提交
5234
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5235 5236 5237 5238 5239
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
J
Jan Kara 已提交
5240
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5241 5242 5243 5244 5245
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5246 5247 5248
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270
				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);
}

5271 5272
static int ext4_quota_off(struct super_block *sb, int type)
{
5273 5274 5275
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5276 5277 5278
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5279 5280
		sync_filesystem(sb);

5281 5282 5283
	if (!inode)
		goto out;

5284 5285
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5286
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5287 5288 5289 5290 5291 5292 5293
	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:
5294 5295 5296
	return dquot_quota_off(sb, type);
}

5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308
/*
 * 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);
}

5309 5310
/* 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
5311
 * itself serializes the operations (and no one else should touch the files)
5312
 * we don't have to be afraid of races */
5313
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5314 5315 5316
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5317
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331
	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;
5332 5333 5334
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349
		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) */
5350
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5351 5352 5353
				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
5354
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5355
	int err, offset = off & (sb->s_blocksize - 1);
5356 5357 5358
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5359
	if (EXT4_SB(sb)->s_journal && !handle) {
5360 5361
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5362 5363 5364
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375
	/*
	 * 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;
	}

5376 5377 5378
	bh = ext4_bread(handle, inode, blk, 1);
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5379 5380
	if (!bh)
		goto out;
5381
	BUFFER_TRACE(bh, "get write access");
5382 5383 5384
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5385
		return err;
5386
	}
5387 5388 5389 5390
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5391
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5392
	brelse(bh);
5393
out:
5394 5395
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5396
		EXT4_I(inode)->i_disksize = inode->i_size;
5397
		ext4_mark_inode_dirty(handle, inode);
5398
	}
5399
	return len;
5400 5401 5402 5403
}

#endif

A
Al Viro 已提交
5404 5405
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5406
{
A
Al Viro 已提交
5407
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5408 5409
}

5410
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422
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);
}
5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433

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;
}
5434 5435 5436
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5437
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5438 5439
#endif

5440
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452
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);
}
5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465

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;
}
5466 5467 5468
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5469
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5470 5471
#endif

T
Theodore Ts'o 已提交
5472 5473 5474
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5475
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5476 5477 5478
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5479
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5480

5481
static int __init ext4_init_feat_adverts(void)
5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504
{
	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;
}

5505 5506 5507 5508 5509 5510 5511
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5512 5513 5514 5515
/* 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];

5516
static int __init ext4_init_fs(void)
5517
{
5518
	int i, err;
5519

5520 5521 5522
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5523
	/* Build-time check for flags consistency */
5524
	ext4_check_flag_values();
5525 5526 5527 5528 5529 5530

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

5531
	err = ext4_init_es();
5532 5533
	if (err)
		return err;
5534 5535 5536 5537 5538

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

5539
	err = ext4_init_system_zone();
5540
	if (err)
5541
		goto out6;
T
Theodore Ts'o 已提交
5542
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5543 5544
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5545
		goto out5;
5546
	}
5547
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5548 5549

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5550 5551
	if (err)
		goto out4;
5552

5553
	err = ext4_init_mballoc();
5554 5555
	if (err)
		goto out2;
5556 5557
	else
		ext4_mballoc_ready = 1;
5558 5559 5560
	err = init_inodecache();
	if (err)
		goto out1;
5561
	register_as_ext3();
5562
	register_as_ext2();
T
Theodore Ts'o 已提交
5563
	err = register_filesystem(&ext4_fs_type);
5564 5565
	if (err)
		goto out;
5566

5567 5568
	return 0;
out:
5569 5570
	unregister_as_ext2();
	unregister_as_ext3();
5571 5572
	destroy_inodecache();
out1:
5573
	ext4_mballoc_ready = 0;
5574
	ext4_exit_mballoc();
5575
out2:
5576
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5577
out4:
5578 5579
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5580
	kset_unregister(ext4_kset);
5581
out5:
5582
	ext4_exit_system_zone();
5583
out6:
5584
	ext4_exit_pageio();
5585 5586 5587
out7:
	ext4_exit_es();

5588 5589 5590
	return err;
}

5591
static void __exit ext4_exit_fs(void)
5592
{
5593
	ext4_destroy_lazyinit_thread();
5594 5595
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5596
	unregister_filesystem(&ext4_fs_type);
5597
	destroy_inodecache();
5598
	ext4_exit_mballoc();
5599
	ext4_exit_feat_adverts();
5600
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5601
	kset_unregister(ext4_kset);
5602 5603
	ext4_exit_system_zone();
	ext4_exit_pageio();
5604
	ext4_exit_es();
5605 5606 5607
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5608
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5609
MODULE_LICENSE("GPL");
5610 5611
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)