super.c 159.7 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/jbd2.h>
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#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
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#include <linux/exportfs.h>
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#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include <linux/ctype.h>
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#include <linux/log2.h>
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#include <linux/crc16.h>
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#include <linux/cleancache.h>
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#include <asm/uaccess.h>

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

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

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static struct proc_dir_entry *ext4_proc_root;
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static struct kset *ext4_kset;
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static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
static struct ext4_features *ext4_feat;
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static int ext4_mballoc_ready;
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static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
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	.mount		= ext4_mount,
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	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext3");
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MODULE_ALIAS("ext3");
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#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
#else
#define IS_EXT3_SB(sb) (0)
#endif
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static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
					EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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

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

	return cpu_to_le32(csum);
}

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static int ext4_superblock_csum_verify(struct super_block *sb,
				       struct ext4_super_block *es)
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{
	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return 1;

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

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

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	if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
		EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
		return;

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

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

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

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

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

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

}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	return bdi->dev == NULL;
}

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

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

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

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

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

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

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

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

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

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

	switch (errno) {
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
518 519
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

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

542 543
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
544 545 546 547 548 549 550 551 552 553 554
{
	char nbuf[16];
	const char *errstr;

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

555 556 557 558 559
	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}
560

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

/*
566
 * ext4_abort is a much stronger failure handler than ext4_error.  The
567 568 569 570 571 572 573 574
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

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

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

588 589 590
	if ((sb->s_flags & MS_RDONLY) == 0) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
591 592 593 594 595 596
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
597 598 599 600
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
601
	if (test_opt(sb, ERRORS_PANIC))
602
		panic("EXT4-fs panic from previous error\n");
603 604
}

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

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

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

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

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

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

639 640 641 642
void __ext4_grp_locked_error(const char *function, unsigned int line,
			     struct super_block *sb, ext4_group_t grp,
			     unsigned long ino, ext4_fsblk_t block,
			     const char *fmt, ...)
643 644 645
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
646
	struct va_format vaf;
647 648 649
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

650 651 652
	es->s_last_error_ino = cpu_to_le32(ino);
	es->s_last_error_block = cpu_to_le64(block);
	__save_error_info(sb, function, line);
J
Joe Perches 已提交
653

654 655 656 657 658 659 660 661 662 663 664 665 666 667
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
		       sb->s_id, function, line, grp);
		if (ino)
			printk(KERN_CONT "inode %lu: ", ino);
		if (block)
			printk(KERN_CONT "block %llu:",
			       (unsigned long long) block);
		printk(KERN_CONT "%pV\n", &vaf);
		va_end(args);
	}
668 669

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

674 675 676 677 678 679 680 681
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
L
Lucas De Marchi 已提交
682
	 * ext4_grp_locked_error() to distinguish between the
683 684 685 686 687 688 689 690
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

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

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

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

703 704 705
	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
706 707 708 709 710 711 712 713 714 715 716 717 718
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

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

/*
 * Open the external journal device
 */
719
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
720 721 722 723
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
817
	ext4_kvfree(sbi->s_group_desc);
818
	ext4_kvfree(sbi->s_flex_groups);
819
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
820 821
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
822
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
823 824
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
825
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
826 827 828 829 830 831 832 833 834 835 836
		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));

837
	invalidate_bdev(sb->s_bdev);
838 839 840 841 842 843 844
	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);
845
		invalidate_bdev(sbi->journal_bdev);
846
		ext4_blkdev_remove(sbi);
847
	}
848 849 850 851
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
852 853
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
854
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
855 856 857 858 859 860
	/*
	 * 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);
861 862
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
863
	kfree(sbi->s_blockgroup_lock);
864 865 866
	kfree(sbi);
}

867
static struct kmem_cache *ext4_inode_cachep;
868 869 870 871

/*
 * Called inside transaction, so use GFP_NOFS
 */
872
static struct inode *ext4_alloc_inode(struct super_block *sb)
873
{
874
	struct ext4_inode_info *ei;
875

C
Christoph Lameter 已提交
876
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
877 878
	if (!ei)
		return NULL;
879

880
	ei->vfs_inode.i_version = 1;
881
	spin_lock_init(&ei->i_raw_lock);
882 883
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
884 885
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
886
	INIT_LIST_HEAD(&ei->i_es_lru);
887
	ei->i_es_all_nr = 0;
888
	ei->i_es_lru_nr = 0;
889
	ei->i_touch_when = 0;
890 891 892
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
893
	ei->i_da_metadata_calc_len = 0;
894
	ei->i_da_metadata_calc_last_lblock = 0;
895
	spin_lock_init(&(ei->i_block_reservation_lock));
896 897 898
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
899
	ei->jinode = NULL;
900
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
901
	spin_lock_init(&ei->i_completed_io_lock);
902 903
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
904
	atomic_set(&ei->i_ioend_count, 0);
905
	atomic_set(&ei->i_unwritten, 0);
906
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
907

908 909 910
	return &ei->vfs_inode;
}

911 912 913 914 915 916 917 918
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
919 920 921 922 923 924
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));
}

925
static void ext4_destroy_inode(struct inode *inode)
926
{
927
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
928 929 930
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
931 932 933 934 935
		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
936
	call_rcu(&inode->i_rcu, ext4_i_callback);
937 938
}

939
static void init_once(void *foo)
940
{
941
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
942

C
Christoph Lameter 已提交
943 944
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
945
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
946
	inode_init_once(&ei->vfs_inode);
947 948
}

949
static int __init init_inodecache(void)
950
{
951 952
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
953 954
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
955
					     init_once);
956
	if (ext4_inode_cachep == NULL)
957 958 959 960 961 962
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
963 964 965 966 967
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
968
	kmem_cache_destroy(ext4_inode_cachep);
969 970
}

A
Al Viro 已提交
971
void ext4_clear_inode(struct inode *inode)
972
{
A
Al Viro 已提交
973
	invalidate_inode_buffers(inode);
974
	clear_inode(inode);
975
	dquot_drop(inode);
976
	ext4_discard_preallocations(inode);
977
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
978
	ext4_es_lru_del(inode);
979 980 981 982 983 984
	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;
	}
985 986
}

C
Christoph Hellwig 已提交
987
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
988
					u64 ino, u32 generation)
989 990 991
{
	struct inode *inode;

992
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
993
		return ERR_PTR(-ESTALE);
994
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
995 996 997 998
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
999
	 * ext4_read_inode will return a bad_inode if the inode had been
1000 1001 1002 1003 1004
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1005 1006 1007 1008
	inode = ext4_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1009 1010 1011
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
1012 1013 1014 1015 1016

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1017
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1018 1019 1020 1021 1022 1023
{
	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,
1024
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1025 1026 1027
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1028 1029
}

1030 1031 1032 1033 1034 1035
/*
 * 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.
 */
1036 1037
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
{
	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);
}

1050
#ifdef CONFIG_QUOTA
1051
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1052
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1053

1054 1055 1056 1057 1058
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);
1059
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1060
			 struct path *path);
1061 1062
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1063
static int ext4_quota_off(struct super_block *sb, int type);
1064
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1065 1066
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,
1067
			       size_t len, loff_t off);
1068
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1069
				const char *data, size_t len, loff_t off);
1070 1071 1072
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);
1073

1074
static const struct dquot_operations ext4_quota_operations = {
1075
	.get_reserved_space = ext4_get_reserved_space,
1076 1077 1078 1079
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1080 1081 1082
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1083 1084
};

1085
static const struct quotactl_ops ext4_qctl_operations = {
1086
	.quota_on	= ext4_quota_on,
1087
	.quota_off	= ext4_quota_off,
1088 1089 1090 1091 1092
	.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
1093
};
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103

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
};
1104 1105
#endif

1106
static const struct super_operations ext4_sops = {
1107 1108 1109 1110
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1111
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1112
	.evict_inode	= ext4_evict_inode,
1113 1114
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1115 1116
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1117 1118 1119
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1120
#ifdef CONFIG_QUOTA
1121 1122
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1123
#endif
1124
	.bdev_try_to_free_page = bdev_try_to_free_page,
1125 1126
};

1127 1128 1129 1130 1131
static const struct super_operations ext4_nojournal_sops = {
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1132
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1133
	.evict_inode	= ext4_evict_inode,
1134
	.sync_fs	= ext4_sync_fs_nojournal,
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
	.put_super	= ext4_put_super,
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
#ifdef CONFIG_QUOTA
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
#endif
	.bdev_try_to_free_page = bdev_try_to_free_page,
};

1146
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1147 1148
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1149
	.get_parent = ext4_get_parent,
1150 1151 1152 1153 1154
};

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,
1155
	Opt_nouid32, Opt_debug, Opt_removed,
1156
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1157
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1158 1159
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1160
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1161
	Opt_data_err_abort, Opt_data_err_ignore,
1162
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1163
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1164
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1165
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1166 1167
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1168
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1169
	Opt_dioread_nolock, Opt_dioread_lock,
1170
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1171
	Opt_max_dir_size_kb,
1172 1173
};

1174
static const match_table_t tokens = {
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	{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"},
1189 1190
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1191 1192 1193 1194
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1195
	{Opt_noload, "norecovery"},
1196
	{Opt_noload, "noload"},
1197 1198
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1199
	{Opt_commit, "commit=%u"},
1200 1201
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1202
	{Opt_journal_dev, "journal_dev=%u"},
1203
	{Opt_journal_path, "journal_path=%s"},
1204 1205
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1206 1207 1208 1209
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1210 1211
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1212 1213 1214 1215 1216 1217
	{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
1218
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1219 1220 1221 1222 1223
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1224 1225
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1226
	{Opt_i_version, "i_version"},
1227
	{Opt_stripe, "stripe=%u"},
1228
	{Opt_delalloc, "delalloc"},
1229
	{Opt_nodelalloc, "nodelalloc"},
1230 1231
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1232 1233
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1234
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1235
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1236
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1237 1238
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1239 1240
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1241 1242
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1243 1244 1245
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1246
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1247 1248 1249 1250 1251
	{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
1252
	{Opt_err, NULL},
1253 1254
};

1255
static ext4_fsblk_t get_sb_block(void **data)
1256
{
1257
	ext4_fsblk_t	sb_block;
1258 1259 1260 1261
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1262

1263
	options += 3;
1264
	/* TODO: use simple_strtoll with >32bit ext4 */
1265 1266
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1267
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1268 1269 1270 1271 1272 1273
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1274

1275 1276 1277
	return sb_block;
}

1278
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1279 1280
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";
1281

D
Dmitry Monakhov 已提交
1282 1283 1284 1285 1286
#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;
1287
	int ret = -1;
D
Dmitry Monakhov 已提交
1288 1289 1290 1291 1292 1293

	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");
1294
		return -1;
D
Dmitry Monakhov 已提交
1295
	}
1296 1297 1298 1299 1300
	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
1301 1302 1303 1304
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1305
		return -1;
D
Dmitry Monakhov 已提交
1306
	}
1307 1308 1309 1310 1311 1312 1313 1314
	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
1315
	}
1316
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1317 1318
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1319
		goto errout;
D
Dmitry Monakhov 已提交
1320
	}
1321
	sbi->s_qf_names[qtype] = qname;
1322
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1323
	return 1;
1324 1325 1326
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
}

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");
1338
		return -1;
D
Dmitry Monakhov 已提交
1339
	}
1340
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1341 1342 1343 1344 1345
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1346 1347 1348 1349 1350 1351
#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
1352
#ifdef CONFIG_QUOTA
1353 1354 1355 1356 1357
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1358
#endif
1359
#define MOPT_DATAJ	0x0080
1360 1361 1362
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1363
#define MOPT_STRING	0x0400
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375

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},
1376 1377 1378 1379
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1380 1381
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1382 1383 1384
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1385
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1386 1387
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1388
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1389 1390 1391
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1392 1393 1394
	{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},
1395 1396 1397 1398
	{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},
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
	{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},
1410 1411 1412
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
1413
	{Opt_journal_path, 0, MOPT_STRING},
1414
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1415 1416 1417 1418
	{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},
1419 1420
	{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
1421
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1422 1423
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1424
#else
1425 1426
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1427
#endif
1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443
	{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},
1444
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1445 1446 1447 1448 1449 1450 1451 1452 1453
	{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;
1454 1455
	kuid_t uid;
	kgid_t gid;
1456 1457
	int arg = 0;

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
#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
1468
	switch (token) {
1469 1470 1471 1472
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1473 1474 1475
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1476
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1477 1478 1479 1480 1481 1482 1483 1484 1485
		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;
	}

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
	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;
	}

1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
	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;
	}

1507
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531
		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) {
1532 1533 1534 1535
		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");
1536
			return -1;
1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551
		}
		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);
1552 1553
			return -1;
		}
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568
		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;
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606
	} 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);
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619
	} 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) {
1620
				ext4_msg(sb, KERN_ERR,
1621 1622
					 "Cannot change data mode on remount");
				return -1;
1623
			}
1624
		} else {
1625 1626
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1627
		}
1628 1629 1630 1631 1632 1633 1634 1635
#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;
		}
1636 1637 1638 1639 1640 1641 1642
		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;
		}
1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
		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;
1660
	}
1661
	return 1;
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
}

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.
		 */
1684
		args[0].to = args[0].from = NULL;
1685 1686 1687 1688
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1689 1690
	}
#ifdef CONFIG_QUOTA
1691 1692 1693 1694 1695 1696
	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;
	}
1697
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1698
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1699
			clear_opt(sb, USRQUOTA);
1700

1701
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1702
			clear_opt(sb, GRPQUOTA);
1703

D
Dmitry Monakhov 已提交
1704
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1705 1706
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1707 1708 1709 1710
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1711 1712
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1713 1714 1715 1716
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1717
			ext4_msg(sb, KERN_ERR, "journaled quota format "
1718
					"specified with no journaling "
1719
					"enabled");
1720 1721 1722 1723
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
	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;
		}
	}
1734 1735 1736
	return 1;
}

1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767
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
}

1768 1769
static const char *token2str(int token)
{
1770
	const struct match_token *t;
1771 1772 1773 1774 1775 1776 1777

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

1778 1779 1780 1781 1782
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1783 1784
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1785 1786 1787
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1788
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1789
	const struct mount_opts *m;
1790
	char sep = nodefs ? '\n' : ',';
1791

1792 1793
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1794 1795

	if (sbi->s_sb_block != 1)
1796 1797 1798 1799 1800 1801 1802
		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;
1803
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1804 1805 1806 1807 1808 1809
			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));
1810
	}
1811

1812
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1813
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1814 1815 1816
		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)) ||
1817
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1818 1819
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1820
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1821 1822
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1823
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1824
		SEQ_OPTS_PUTS("errors=continue");
1825
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1826
		SEQ_OPTS_PUTS("errors=panic");
1827
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1828
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1829
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1830
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1831
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1832
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1833
	if (sb->s_flags & MS_I_VERSION)
1834
		SEQ_OPTS_PUTS("i_version");
1835
	if (nodefs || sbi->s_stripe)
1836
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1837
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1838 1839 1840 1841 1842 1843 1844
		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");
	}
1845 1846
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1847 1848
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1849

1850 1851
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1852
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1853 1854
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1855 1856 1857 1858 1859

	ext4_show_quota_options(seq, sb);
	return 0;
}

1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877
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
1878
	return single_open(file, options_seq_show, PDE_DATA(inode));
1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
}

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,
};

1889
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1890 1891
			    int read_only)
{
1892
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1893 1894
	int res = 0;

1895
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1896 1897
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1898 1899 1900
		res = MS_RDONLY;
	}
	if (read_only)
1901
		goto done;
1902
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1903 1904
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1905
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1906 1907 1908
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1909
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1910 1911
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1912 1913 1914
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1915 1916 1917
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1918 1919 1920
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1921
	if (!sbi->s_journal)
1922
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1923
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1924
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1925
	le16_add_cpu(&es->s_mnt_count, 1);
1926
	es->s_mtime = cpu_to_le32(get_seconds());
1927
	ext4_update_dynamic_rev(sb);
1928 1929
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1930

1931
	ext4_commit_super(sb, 1);
1932
done:
1933
	if (test_opt(sb, DEBUG))
1934
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1935
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1936 1937
			sb->s_blocksize,
			sbi->s_groups_count,
1938 1939
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1940
			sbi->s_mount_opt, sbi->s_mount_opt2);
1941

D
Dan Magenheimer 已提交
1942
	cleancache_init_fs(sb);
1943 1944 1945
	return res;
}

1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
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;
}

1978 1979 1980 1981 1982
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;
1983
	int i, err;
1984

1985
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1986
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1987 1988 1989 1990
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1991 1992
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1993
		goto failed;
1994 1995

	for (i = 0; i < sbi->s_groups_count; i++) {
1996
		gdp = ext4_get_group_desc(sb, i, NULL);
1997 1998

		flex_group = ext4_flex_group(sbi, i);
1999 2000
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2001 2002
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2003 2004
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2005 2006 2007 2008 2009 2010 2011
	}

	return 1;
failed:
	return 0;
}

2012 2013
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
2014
{
2015
	int offset;
A
Andreas Dilger 已提交
2016
	__u16 crc = 0;
2017
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
2018

2019 2020 2021
	if ((sbi->s_es->s_feature_ro_compat &
	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
		/* Use new metadata_csum algorithm */
2022
		__le16 save_csum;
2023 2024
		__u32 csum32;

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

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

2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052
	/* 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
2053 2054 2055
	return cpu_to_le16(crc);
}

2056
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2057 2058
				struct ext4_group_desc *gdp)
{
2059 2060 2061
	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
2062 2063 2064 2065 2066
		return 0;

	return 1;
}

2067 2068 2069 2070 2071 2072 2073 2074
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);
}

2075
/* Called at mount-time, super-block is locked */
2076 2077
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2078
{
2079 2080 2081
	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
2082 2083 2084
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2085
	int flexbg_flag = 0;
2086
	ext4_group_t i, grp = sbi->s_groups_count;
2087

J
Jose R. Santos 已提交
2088 2089 2090
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2091
	ext4_debug("Checking group descriptors");
2092

2093 2094 2095
	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
2096
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2097
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2098 2099
		else
			last_block = first_block +
2100
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2101

2102 2103 2104 2105
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2106
		block_bitmap = ext4_block_bitmap(sb, gdp);
2107
		if (block_bitmap < first_block || block_bitmap > last_block) {
2108
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2109
			       "Block bitmap for group %u not in group "
2110
			       "(block %llu)!", i, block_bitmap);
2111 2112
			return 0;
		}
2113
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2114
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2115
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2116
			       "Inode bitmap for group %u not in group "
2117
			       "(block %llu)!", i, inode_bitmap);
2118 2119
			return 0;
		}
2120
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2121
		if (inode_table < first_block ||
2122
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2123
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2124
			       "Inode table for group %u not in group "
2125
			       "(block %llu)!", i, inode_table);
2126 2127
			return 0;
		}
2128
		ext4_lock_group(sb, i);
2129
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2130 2131 2132 2133
			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));
2134
			if (!(sb->s_flags & MS_RDONLY)) {
2135
				ext4_unlock_group(sb, i);
2136
				return 0;
2137
			}
A
Andreas Dilger 已提交
2138
		}
2139
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2140 2141
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2142
	}
2143 2144
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2145 2146 2147
	return 1;
}

2148
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
 * 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
2161
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2162 2163 2164
 * 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.
 */
2165 2166
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177
{
	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;
	}

2178
	if (bdev_read_only(sb->s_bdev)) {
2179 2180
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2181 2182 2183
		return;
	}

2184 2185 2186 2187 2188 2189 2190
	/* 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;
	}

2191
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2192 2193
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2194 2195
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
2196 2197
			es->s_last_orphan = 0;
		}
2198 2199 2200 2201 2202
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2203
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2204 2205 2206 2207 2208 2209
		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
2210
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2211 2212
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2213
			if (ret < 0)
2214 2215 2216
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2217 2218 2219 2220 2221 2222 2223
		}
	}
#endif

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

2224 2225
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2226 2227 2228 2229
			es->s_last_orphan = 0;
			break;
		}

2230
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2231
		dquot_initialize(inode);
2232
		if (inode->i_nlink) {
2233 2234 2235 2236
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2237
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2238
				  inode->i_ino, inode->i_size);
2239
			mutex_lock(&inode->i_mutex);
2240
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2241
			ext4_truncate(inode);
2242
			mutex_unlock(&inode->i_mutex);
2243 2244
			nr_truncates++;
		} else {
2245 2246 2247 2248
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2249 2250 2251 2252 2253 2254 2255
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2256
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2257 2258

	if (nr_orphans)
2259 2260
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2261
	if (nr_truncates)
2262 2263
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2264 2265
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
J
Jan Kara 已提交
2266
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2267
		if (sb_dqopt(sb)->files[i])
2268
			dquot_quota_off(sb, i);
2269 2270 2271 2272
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2273

2274 2275 2276 2277 2278 2279 2280
/*
 * 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.
 *
2281 2282 2283 2284 2285 2286
 * 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.
 *
2287 2288
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2289
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2290 2291 2292 2293 2294
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2295
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2296
		/*
2297
		 * CONFIG_LBDAF is not enabled implies the inode
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307
		 * 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;
	}

2308 2309 2310 2311 2312 2313
	/*
	 * 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;
2314 2315 2316 2317 2318 2319 2320 2321
	res <<= blkbits;

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

	return res;
}
2322 2323

/*
2324
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2325 2326
 * 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.
2327
 */
2328
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2329
{
2330
	loff_t res = EXT4_NDIR_BLOCKS;
2331 2332
	int meta_blocks;
	loff_t upper_limit;
2333 2334 2335 2336 2337 2338
	/* 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.
2339 2340
	 */

2341
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2342
		/*
2343
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2344 2345
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2346 2347 2348 2349 2350 2351 2352
		 */
		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
2353 2354 2355 2356 2357 2358
		/*
		 * 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
		 */
2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371
		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;
2372 2373 2374 2375 2376 2377 2378

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2379 2380 2381 2382

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2383 2384 2385
	return res;
}

2386
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2387
				   ext4_fsblk_t logical_sb_block, int nr)
2388
{
2389
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2390
	ext4_group_t bg, first_meta_bg;
2391 2392 2393 2394
	int has_super = 0;

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

2395
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2396
	    nr < first_meta_bg)
2397
		return logical_sb_block + nr + 1;
2398
	bg = sbi->s_desc_per_block * nr;
2399
	if (ext4_bg_has_super(sb, bg))
2400
		has_super = 1;
2401

2402 2403 2404 2405 2406 2407 2408 2409 2410 2411
	/*
	 * 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++;

2412
	return (has_super + ext4_group_first_block_no(sb, bg));
2413 2414
}

2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430
/**
 * 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
2431
	int ret;
2432 2433

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2434 2435 2436 2437 2438 2439 2440
		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;
2441

D
Dan Ehrenberg 已提交
2442 2443 2444 2445 2446 2447
	/*
	 * 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;
2448

D
Dan Ehrenberg 已提交
2449
	return ret;
2450
}
2451

T
Theodore Ts'o 已提交
2452 2453 2454 2455 2456
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2457
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2458
			 const char *, size_t);
2459 2460 2461 2462
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2463 2464
};

L
Lukas Czerner 已提交
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475
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
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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",
2481 2482
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
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}

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

2490 2491
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			 sbi->s_sectors_written_start) >> 1);
}

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

2502 2503
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
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	return snprintf(buf, PAGE_SIZE, "%llu\n",
2505
			(unsigned long long)(sbi->s_kbytes_written +
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			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2507
			  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;
2515
	int ret;
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2517 2518 2519
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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2521
	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,
2529
			   struct ext4_sb_info *sbi, char *buf)
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{
2531
	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)
{
2540
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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	unsigned long t;
2542
	int ret;
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2544 2545 2546
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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	*ui = t;
	return count;
}

2551 2552 2553 2554 2555 2556 2557 2558 2559 2560
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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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;
}

2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598
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;
}

2599 2600 2601 2602 2603 2604
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,					\
2610 2611 2612
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
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}
2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624

#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)

2628
#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)
2631 2632 2633

#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)
2636

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#define ATTR_LIST(name) &ext4_attr_##name.attr
2638 2639 2640 2641 2642 2643 2644 2645
#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);
2653
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);
2660
EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2661
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2662
EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2663 2664 2665 2666 2667 2668
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);
2669 2670 2671
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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	ATTR_LIST(reserved_clusters),
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	ATTR_LIST(inode_readahead_blks),
2679
	ATTR_LIST(inode_goal),
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	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
2686
	ATTR_LIST(max_writeback_mb_bump),
2687
	ATTR_LIST(extent_max_zeroout_kb),
2688
	ATTR_LIST(trigger_fs_error),
2689 2690 2691 2692 2693 2694
	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),
2695 2696 2697
	ATTR_LIST(errors_count),
	ATTR_LIST(first_error_time),
	ATTR_LIST(last_error_time),
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	NULL,
};

2701 2702
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2703
EXT4_INFO_ATTR(batched_discard);
2704
EXT4_INFO_ATTR(meta_bg_resize);
2705 2706 2707

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2708
	ATTR_LIST(batched_discard),
2709
	ATTR_LIST(meta_bg_resize),
2710 2711 2712
	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);
}

2741
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,
};

2752 2753 2754 2755 2756
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772
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,
};

2773 2774
static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
2775
	.sysfs_ops	= &ext4_feat_ops,
2776 2777 2778
	.release	= ext4_feat_release,
};

2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
/*
 * 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;
		}
	}
2819 2820 2821 2822 2823 2824 2825
	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;
	}
2826 2827 2828 2829 2830 2831 2832 2833 2834 2835

#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 */
2836 2837 2838
	return 1;
}

2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852
/*
 * 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)
2853 2854
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2855 2856
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2857
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870
		       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) {
2871
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886
		       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 */
}

2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898
/* 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;

2899
	sb_start_write(sb);
2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910
	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;
	}

2911
	if (group >= ngroups)
2912 2913 2914 2915 2916 2917 2918
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2919 2920
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2921 2922 2923 2924 2925
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2926
	sb_end_write(sb);
2927 2928 2929 2930 2931 2932

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2933
 * request structure. Should be called with li_list_mtx held
2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
 */
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)
{
2951 2952 2953
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2954
		return;
2955
	}
2956 2957

	mutex_lock(&ext4_li_info->li_list_mtx);
2958
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2959
	mutex_unlock(&ext4_li_info->li_list_mtx);
2960
	mutex_unlock(&ext4_li_mtx);
2961 2962
}

2963 2964
static struct task_struct *ext4_lazyinit_task;

2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978
/*
 * 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;
2979
	unsigned long next_wakeup, cur;
2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996

	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);

2997 2998 2999 3000 3001 3002
			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;
				}
3003 3004 3005 3006 3007 3008 3009
			}

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

3010
		try_to_freeze();
3011

3012 3013
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
3014
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
3015 3016 3017 3018
			cond_resched();
			continue;
		}

3019 3020
		schedule_timeout_interruptible(next_wakeup - cur);

3021 3022 3023 3024
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066
	}

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)
{
3067 3068 3069 3070
	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);
3071 3072 3073
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
3074
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
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 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142
				 "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.
	 */
3143 3144
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
3145 3146 3147
	return elr;
}

3148 3149
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3150 3151
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3152
	struct ext4_li_request *elr = NULL;
3153
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3154
	int ret = 0;
3155

3156
	mutex_lock(&ext4_li_mtx);
3157 3158 3159 3160 3161 3162
	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;
3163
		goto out;
3164
	}
3165 3166 3167

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3168
	    !test_opt(sb, INIT_INODE_TABLE))
3169
		goto out;
3170 3171

	elr = ext4_li_request_new(sb, first_not_zeroed);
3172 3173 3174 3175
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187

	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;
3188 3189 3190 3191 3192 3193
	/*
	 * 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;
3194 3195 3196 3197 3198 3199 3200

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3201 3202
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216
		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.
	 */
3217
	if (!ext4_li_info || !ext4_lazyinit_task)
3218 3219
		return;

3220
	kthread_stop(ext4_lazyinit_task);
3221 3222
}

3223 3224 3225 3226 3227 3228 3229 3230
static int set_journal_csum_feature_set(struct super_block *sb)
{
	int ret = 1;
	int compat, incompat;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
				       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3231
		/* journal checksum v3 */
3232
		compat = 0;
3233
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3234 3235 3236 3237 3238 3239
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

3240 3241 3242 3243
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
	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 {
3256 3257
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3258 3259 3260 3261 3262
	}

	return ret;
}

3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286
/*
 * 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;

3287 3288 3289 3290
	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);

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 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367
	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();
	}
3368 3369
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3370
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3371

3372 3373 3374 3375 3376 3377
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3378

3379
static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
L
Lukas Czerner 已提交
3380 3381 3382
{
	ext4_fsblk_t resv_clusters;

3383 3384 3385 3386 3387 3388 3389 3390
	/*
	 * 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
3391 3392 3393 3394
	/*
	 * 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
3395
	 * unwritten extents in delalloc path. In most cases such
L
Lukas Czerner 已提交
3396 3397 3398
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3399 3400
	resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
			EXT4_SB(sb)->s_cluster_bits;
L
Lukas Czerner 已提交
3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420

	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;
}

3421
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3422
{
3423
	char *orig_data = kstrdup(data, GFP_KERNEL);
3424
	struct buffer_head *bh;
3425 3426 3427 3428
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3429
	ext4_fsblk_t logical_sb_block;
3430 3431 3432 3433
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3434
	char *cp;
3435
	const char *descr;
3436
	int ret = -ENOMEM;
3437
	int blocksize, clustersize;
3438 3439
	unsigned int db_count;
	unsigned int i;
3440
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3441
	__u64 blocks_count;
3442
	int err = 0;
3443
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3444
	ext4_group_t first_not_zeroed;
3445 3446 3447

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3448
		goto out_free_orig;
3449 3450 3451 3452 3453

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3454
		goto out_free_orig;
3455
	}
3456
	sb->s_fs_info = sbi;
3457
	sbi->s_sb = sb;
3458
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3459
	sbi->s_sb_block = sb_block;
3460 3461 3462
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3463

3464 3465 3466 3467
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3468
	/* -EINVAL is default */
3469
	ret = -EINVAL;
3470
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3471
	if (!blocksize) {
3472
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3473 3474 3475 3476
		goto out_fail;
	}

	/*
3477
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3478 3479
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3480
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3481 3482
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3483
	} else {
3484
		logical_sb_block = sb_block;
3485 3486
	}

3487
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3488
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3489 3490 3491 3492
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3493
	 *       some ext4 macro-instructions depend on its value
3494
	 */
3495
	es = (struct ext4_super_block *) (bh->b_data + offset);
3496 3497
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3498 3499
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3500
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3501

3502 3503 3504 3505 3506 3507 3508
	/* 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.");

3509 3510 3511 3512 3513 3514 3515 3516
	/* 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;
	}

3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528
	/* 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;
		}
	}

3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542
	/* Check superblock checksum */
	if (!ext4_superblock_csum_verify(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "invalid superblock checksum.  Run e2fsck?");
		silent = 1;
		goto cantfind_ext4;
	}

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

3543 3544
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3545
	set_opt(sb, INIT_INODE_TABLE);
3546
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3547
		set_opt(sb, DEBUG);
3548
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3549
		set_opt(sb, GRPID);
3550
	if (def_mount_opts & EXT4_DEFM_UID16)
3551
		set_opt(sb, NO_UID32);
3552 3553
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3554
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3555
	set_opt(sb, POSIX_ACL);
3556
#endif
3557
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3558
		set_opt(sb, JOURNAL_DATA);
3559
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3560
		set_opt(sb, ORDERED_DATA);
3561
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3562
		set_opt(sb, WRITEBACK_DATA);
3563 3564

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3565
		set_opt(sb, ERRORS_PANIC);
3566
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3567
		set_opt(sb, ERRORS_CONT);
3568
	else
3569
		set_opt(sb, ERRORS_RO);
3570 3571
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3572
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3573
		set_opt(sb, DISCARD);
3574

3575 3576
	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));
3577 3578 3579
	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;
3580

3581
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3582
		set_opt(sb, BARRIER);
3583

3584 3585 3586 3587
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3588
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3589
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3590
		set_opt(sb, DELALLOC);
3591

3592 3593 3594 3595 3596 3597
	/*
	 * 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;

3598
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3599
			   &journal_devnum, &journal_ioprio, 0)) {
3600 3601 3602 3603
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3604
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3605
	if (!parse_options((char *) data, sb, &journal_devnum,
3606
			   &journal_ioprio, 0))
3607 3608
		goto failed_mount;

3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619
	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 "
3620
				 "both data=journal and dioread_nolock");
3621 3622 3623 3624 3625 3626
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3627
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3628
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3629

3630 3631 3632 3633
	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)))
3634 3635 3636
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3637

3638 3639 3640 3641 3642 3643 3644 3645 3646 3647
	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;
		}
	}

3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669
	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;
		}
	}

3670 3671 3672 3673 3674
	/*
	 * 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.
	 */
3675
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3676
		goto failed_mount;
3677

J
Jan Kara 已提交
3678
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3679 3680
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3681 3682
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3683 3684 3685 3686
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3687 3688
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3689
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3690
					blocksize);
3691 3692 3693
			goto failed_mount;
		}

3694
		brelse(bh);
3695 3696
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3697
		bh = sb_bread_unmovable(sb, logical_sb_block);
3698
		if (!bh) {
3699 3700
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3701 3702
			goto failed_mount;
		}
3703
		es = (struct ext4_super_block *)(bh->b_data + offset);
3704
		sbi->s_es = es;
3705
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3706 3707
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3708 3709 3710 3711
			goto failed_mount;
		}
	}

3712 3713
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3714 3715 3716
	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);
3717

3718 3719 3720
	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;
3721 3722 3723
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3724
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3725
		    (!is_power_of_2(sbi->s_inode_size)) ||
3726
		    (sbi->s_inode_size > blocksize)) {
3727 3728
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3729
			       sbi->s_inode_size);
3730 3731
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3732 3733
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3734
	}
3735

3736 3737
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3738
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3739
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3740
		    !is_power_of_2(sbi->s_desc_size)) {
3741 3742
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3743 3744 3745 3746 3747
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3748

3749 3750
	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);
3751
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3752
		goto cantfind_ext4;
3753

3754
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3755
	if (sbi->s_inodes_per_block == 0)
3756
		goto cantfind_ext4;
3757 3758
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3759
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3760 3761
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3762 3763
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3764

3765
	for (i = 0; i < 4; i++)
3766 3767
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3768 3769 3770 3771 3772
	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) {
3773
#ifdef __CHAR_UNSIGNED__
3774 3775 3776 3777
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3778
#else
3779 3780 3781
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3782
#endif
3783
		}
3784
	}
3785

3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
	/* 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;
3830
	}
3831 3832
	sbi->s_cluster_ratio = clustersize / blocksize;

3833
	if (sbi->s_inodes_per_group > blocksize * 8) {
3834 3835
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3836
		       sbi->s_inodes_per_group);
3837 3838 3839
		goto failed_mount;
	}

3840 3841 3842 3843
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3844 3845 3846 3847
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3848
	err = generic_check_addressable(sb->s_blocksize_bits,
3849
					ext4_blocks_count(es));
3850
	if (err) {
3851
		ext4_msg(sb, KERN_ERR, "filesystem"
3852
			 " too large to mount safely on this system");
3853
		if (sizeof(sector_t) < 8)
3854
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3855 3856 3857
		goto failed_mount;
	}

3858 3859
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3860

3861 3862 3863
	/* 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) {
3864 3865
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3866 3867 3868 3869
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3870 3871 3872 3873 3874
	/*
	 * 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)) {
3875
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3876 3877 3878
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3879 3880
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3881 3882 3883 3884
	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));
3885
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3886
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3887
		       "(block count %llu, first data block %u, "
3888
		       "blocks per group %lu)", sbi->s_groups_count,
3889 3890 3891 3892 3893
		       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
3894
	sbi->s_groups_count = blocks_count;
3895 3896
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3897 3898
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3899 3900 3901
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3902
	if (sbi->s_group_desc == NULL) {
3903
		ext4_msg(sb, KERN_ERR, "not enough memory");
3904
		ret = -ENOMEM;
3905 3906 3907
		goto failed_mount;
	}

3908 3909
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3910

3911 3912 3913 3914
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3915
	bgl_lock_init(sbi->s_blockgroup_lock);
3916 3917

	for (i = 0; i < db_count; i++) {
3918
		block = descriptor_loc(sb, logical_sb_block, i);
3919
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3920
		if (!sbi->s_group_desc[i]) {
3921 3922
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3923 3924 3925 3926
			db_count = i;
			goto failed_mount2;
		}
	}
3927
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3928
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3929
		goto failed_mount2;
3930
	}
3931

3932
	sbi->s_gdb_count = db_count;
3933 3934 3935
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3936 3937 3938 3939
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3940
	/* Register extent status tree shrinker */
3941
	if (ext4_es_register_shrinker(sbi))
3942 3943
		goto failed_mount3;

3944
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3945
	sbi->s_extent_max_zeroout_kb = 32;
3946

3947 3948 3949 3950 3951 3952 3953 3954
	/*
	 * set up enough so that it can read an inode
	 */
	if (!test_opt(sb, NOLOAD) &&
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
		sb->s_op = &ext4_sops;
	else
		sb->s_op = &ext4_nojournal_sops;
3955 3956
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3957
#ifdef CONFIG_QUOTA
3958
	sb->dq_op = &ext4_quota_operations;
3959
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3960
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3961 3962
	else
		sb->s_qcop = &ext4_qctl_operations;
3963
#endif
3964 3965
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3966
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3967
	mutex_init(&sbi->s_orphan_lock);
3968 3969 3970 3971

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3972 3973
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3974

3975 3976 3977 3978 3979
	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;

3980 3981 3982 3983 3984
	/*
	 * 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) &&
3985 3986
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3987
			goto failed_mount3;
3988 3989
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3990 3991
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3992
		goto failed_mount_wq;
3993
	} else {
3994
		clear_opt(sb, DATA_FLAGS);
3995 3996 3997
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3998 3999
	}

4000
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
4001 4002
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
4003
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4004
		goto failed_mount_wq;
4005 4006
	}

4007 4008 4009 4010
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
4011
	}
4012

4013 4014 4015 4016 4017
	/* 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
4018 4019 4020
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
4021 4022
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4023
			set_opt(sb, ORDERED_DATA);
4024
		else
4025
			set_opt(sb, JOURNAL_DATA);
4026 4027
		break;

4028 4029
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
4030 4031
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4032 4033
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
4034
			goto failed_mount_wq;
4035 4036 4037 4038
		}
	default:
		break;
	}
4039
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4040

B
Bobi Jam 已提交
4041 4042
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

4043
no_journal:
4044 4045 4046 4047 4048 4049 4050 4051
	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;
		}
	}

4052 4053 4054 4055 4056 4057 4058
	/*
	 * 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 {
4059 4060
		err = ext4_calculate_overhead(sb);
		if (err)
4061 4062 4063
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
4064 4065 4066 4067
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
4068 4069 4070 4071
	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");
4072
		ret = -ENOMEM;
4073 4074 4075
		goto failed_mount4;
	}

4076
	/*
4077
	 * The jbd2_journal_load will have done any necessary log recovery,
4078 4079 4080
	 * so we can safely mount the rest of the filesystem now.
	 */

4081 4082
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
4083
		ext4_msg(sb, KERN_ERR, "get root inode failed");
4084
		ret = PTR_ERR(root);
4085
		root = NULL;
4086 4087 4088
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4089
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
4090
		iput(root);
4091 4092
		goto failed_mount4;
	}
4093
	sb->s_root = d_make_root(root);
4094
	if (!sb->s_root) {
4095
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
4096 4097 4098
		ret = -ENOMEM;
		goto failed_mount4;
	}
4099

4100 4101
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123

	/* 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;
4124 4125
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4126 4127
	}

4128
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
L
Lukas Czerner 已提交
4129 4130
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4131
			 "reserved pool", ext4_calculate_resv_clusters(sb));
4132
		goto failed_mount4a;
L
Lukas Czerner 已提交
4133 4134
	}

4135 4136
	err = ext4_setup_system_zone(sb);
	if (err) {
4137
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4138
			 "zone (%d)", err);
4139 4140 4141 4142 4143 4144 4145 4146
		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);
4147
		goto failed_mount5;
4148 4149
	}

4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176
	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;
		}

4177 4178
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4179
		goto failed_mount6;
4180

T
Theodore Ts'o 已提交
4181 4182 4183 4184
	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);
4185 4186
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4187

4188 4189 4190 4191 4192 4193 4194 4195 4196 4197
#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 */

4198 4199 4200
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4201
	if (needs_recovery) {
4202
		ext4_msg(sb, KERN_INFO, "recovery complete");
4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214
		ext4_mark_recovery_complete(sb, es);
	}
	if (EXT4_SB(sb)->s_journal) {
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			descr = " journalled data mode";
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			descr = " ordered data mode";
		else
			descr = " writeback data mode";
	} else
		descr = "out journal";

4215 4216 4217 4218 4219 4220 4221 4222
	if (test_opt(sb, DISCARD)) {
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		if (!blk_queue_discard(q))
			ext4_msg(sb, KERN_WARNING,
				 "mounting with \"discard\" option, but "
				 "the device does not support discard");
	}

4223
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4224 4225
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4226

4227 4228
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4229

4230 4231 4232 4233 4234
	/* 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);

4235
	kfree(orig_data);
4236 4237
	return 0;

4238
cantfind_ext4:
4239
	if (!silent)
4240
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4241 4242
	goto failed_mount;

4243 4244 4245 4246
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4247 4248 4249
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4250
	ext4_mb_release(sb);
4251 4252 4253 4254 4255 4256
	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);
4257
failed_mount5:
4258 4259 4260
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
A
Al Viro 已提交
4261
	dput(sb->s_root);
4262
	sb->s_root = NULL;
A
Al Viro 已提交
4263
failed_mount4:
4264
	ext4_msg(sb, KERN_ERR, "mount failed");
4265 4266
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4267
failed_mount_wq:
4268 4269 4270 4271
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4272
	ext4_es_unregister_shrinker(sbi);
4273
failed_mount3:
4274
	del_timer_sync(&sbi->s_err_report);
4275 4276
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4277 4278 4279
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4280
	ext4_kvfree(sbi->s_group_desc);
4281
failed_mount:
4282 4283
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4284
	if (sbi->s_proc) {
4285
		remove_proc_entry("options", sbi->s_proc);
4286
		remove_proc_entry(sb->s_id, ext4_proc_root);
4287
	}
4288
#ifdef CONFIG_QUOTA
J
Jan Kara 已提交
4289
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4290 4291
		kfree(sbi->s_qf_names[i]);
#endif
4292
	ext4_blkdev_remove(sbi);
4293 4294 4295
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4296
	kfree(sbi->s_blockgroup_lock);
4297
	kfree(sbi);
4298
out_free_orig:
4299
	kfree(orig_data);
4300
	return err ? err : ret;
4301 4302 4303 4304 4305 4306 4307
}

/*
 * 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.
 */
4308
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4309
{
4310
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4311

4312 4313 4314
	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;
4315

4316
	write_lock(&journal->j_state_lock);
4317
	if (test_opt(sb, BARRIER))
4318
		journal->j_flags |= JBD2_BARRIER;
4319
	else
4320
		journal->j_flags &= ~JBD2_BARRIER;
4321 4322 4323 4324
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4325
	write_unlock(&journal->j_state_lock);
4326 4327
}

4328
static journal_t *ext4_get_journal(struct super_block *sb,
4329 4330 4331 4332 4333
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4334 4335
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4336 4337 4338 4339
	/* 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. */

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

4352
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4353
		  journal_inode, journal_inode->i_size);
4354
	if (!S_ISREG(journal_inode->i_mode)) {
4355
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4356 4357 4358 4359
		iput(journal_inode);
		return NULL;
	}

4360
	journal = jbd2_journal_init_inode(journal_inode);
4361
	if (!journal) {
4362
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4363 4364 4365 4366
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4367
	ext4_init_journal_params(sb, journal);
4368 4369 4370
	return journal;
}

4371
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4372 4373
				       dev_t j_dev)
{
4374
	struct buffer_head *bh;
4375
	journal_t *journal;
4376 4377
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4378
	int hblock, blocksize;
4379
	ext4_fsblk_t sb_block;
4380
	unsigned long offset;
4381
	struct ext4_super_block *es;
4382 4383
	struct block_device *bdev;

4384 4385
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4386
	bdev = ext4_blkdev_get(j_dev, sb);
4387 4388 4389 4390
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4391
	hblock = bdev_logical_block_size(bdev);
4392
	if (blocksize < hblock) {
4393 4394
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4395 4396 4397
		goto out_bdev;
	}

4398 4399
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4400 4401
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4402 4403
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4404 4405 4406
		goto out_bdev;
	}

4407
	es = (struct ext4_super_block *) (bh->b_data + offset);
4408
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4409
	    !(le32_to_cpu(es->s_feature_incompat) &
4410
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4411 4412
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4413 4414 4415 4416
		brelse(bh);
		goto out_bdev;
	}

4417 4418 4419 4420 4421 4422 4423 4424 4425
	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;
	}

4426
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4427
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4428 4429 4430 4431
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4432
	len = ext4_blocks_count(es);
4433 4434 4435
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4436
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4437 4438
					start, len, blocksize);
	if (!journal) {
4439
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4440 4441 4442
		goto out_bdev;
	}
	journal->j_private = sb;
4443
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4444 4445
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4446
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4447 4448 4449
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4450 4451
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4452 4453 4454
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4455 4456
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4457
	return journal;
4458

4459
out_journal:
4460
	jbd2_journal_destroy(journal);
4461
out_bdev:
4462
	ext4_blkdev_put(bdev);
4463 4464 4465
	return NULL;
}

4466 4467
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4468 4469 4470 4471 4472 4473 4474 4475
			     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;

4476 4477
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4478 4479
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4480 4481
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492
		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.
	 */
4493
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4494
		if (sb->s_flags & MS_RDONLY) {
4495 4496
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4497
			if (really_read_only) {
4498 4499
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4500 4501
				return -EROFS;
			}
4502 4503
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4504 4505 4506 4507
		}
	}

	if (journal_inum && journal_dev) {
4508 4509
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4510 4511 4512 4513
		return -EINVAL;
	}

	if (journal_inum) {
4514
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4515 4516
			return -EINVAL;
	} else {
4517
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4518 4519 4520
			return -EINVAL;
	}

4521
	if (!(journal->j_flags & JBD2_BARRIER))
4522
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4523

4524
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4525
		err = jbd2_journal_wipe(journal, !really_read_only);
4526 4527 4528 4529 4530
	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);
4531
		err = jbd2_journal_load(journal);
4532 4533 4534 4535 4536
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4537 4538

	if (err) {
4539
		ext4_msg(sb, KERN_ERR, "error loading journal");
4540
		jbd2_journal_destroy(journal);
4541 4542 4543
		return err;
	}

4544 4545
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4546

4547
	if (!really_read_only && journal_devnum &&
4548 4549 4550 4551
	    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. */
4552
		ext4_commit_super(sb, 1);
4553 4554 4555 4556 4557
	}

	return 0;
}

4558
static int ext4_commit_super(struct super_block *sb, int sync)
4559
{
4560
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4561
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4562
	int error = 0;
4563

4564
	if (!sbh || block_device_ejected(sb))
4565
		return error;
4566 4567 4568 4569 4570 4571 4572 4573 4574
	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.
		 */
4575 4576
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4577 4578 4579
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591
	/*
	 * 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());
4592 4593 4594
	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
4595 4596
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4597 4598 4599
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4600 4601
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4602 4603
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4604 4605 4606
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4607
				&EXT4_SB(sb)->s_freeinodes_counter));
4608
	BUFFER_TRACE(sbh, "marking dirty");
4609
	ext4_superblock_csum_set(sb);
4610
	mark_buffer_dirty(sbh);
4611
	if (sync) {
4612 4613 4614 4615 4616 4617
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4618 4619
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4620 4621 4622 4623
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4624
	return error;
4625 4626 4627 4628 4629 4630 4631
}

/*
 * 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.
 */
4632 4633
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4634
{
4635
	journal_t *journal = EXT4_SB(sb)->s_journal;
4636

4637 4638 4639 4640
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4641
	jbd2_journal_lock_updates(journal);
4642 4643 4644
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4645
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4646
	    sb->s_flags & MS_RDONLY) {
4647
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4648
		ext4_commit_super(sb, 1);
4649
	}
4650 4651

out:
4652
	jbd2_journal_unlock_updates(journal);
4653 4654 4655 4656 4657 4658 4659
}

/*
 * 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.
 */
4660 4661
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4662 4663 4664 4665 4666
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4667 4668
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

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

	/*
	 * Now check for any error status which may have been recorded in the
4673
	 * journal by a prior ext4_error() or ext4_abort()
4674 4675
	 */

4676
	j_errno = jbd2_journal_errno(journal);
4677 4678 4679
	if (j_errno) {
		char nbuf[16];

4680
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4681
		ext4_warning(sb, "Filesystem error recorded "
4682
			     "from previous mount: %s", errstr);
4683
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4684

4685 4686
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4687
		ext4_commit_super(sb, 1);
4688

4689
		jbd2_journal_clear_err(journal);
4690
		jbd2_journal_update_sb_errno(journal);
4691 4692 4693 4694 4695 4696 4697
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4698
int ext4_force_commit(struct super_block *sb)
4699 4700 4701 4702 4703 4704
{
	journal_t *journal;

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

4705
	journal = EXT4_SB(sb)->s_journal;
4706
	return ext4_journal_force_commit(journal);
4707 4708
}

4709
static int ext4_sync_fs(struct super_block *sb, int wait)
4710
{
4711
	int ret = 0;
4712
	tid_t target;
4713
	bool needs_barrier = false;
4714
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4715

4716
	trace_ext4_sync_fs(sb, wait);
4717
	flush_workqueue(sbi->rsv_conversion_wq);
4718 4719 4720 4721 4722
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4723 4724 4725 4726 4727 4728 4729 4730 4731 4732
	/*
	 * Data writeback is possible w/o journal transaction, so barrier must
	 * being sent at the end of the function. But we can skip it if
	 * transaction_commit will do it for us.
	 */
	target = jbd2_get_latest_transaction(sbi->s_journal);
	if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
	    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
		needs_barrier = true;

4733
	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4734
		if (wait)
4735 4736 4737 4738 4739 4740 4741
			ret = jbd2_log_wait_commit(sbi->s_journal, target);
	}
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4742
	}
4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756

	return ret;
}

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

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

4757
	return ret;
4758 4759 4760 4761 4762
}

/*
 * 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.
4763 4764
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4765 4766
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4767
 */
4768
static int ext4_freeze(struct super_block *sb)
4769
{
4770 4771
	int error = 0;
	journal_t *journal;
4772

4773 4774
	if (sb->s_flags & MS_RDONLY)
		return 0;
4775

4776
	journal = EXT4_SB(sb)->s_journal;
4777

4778 4779
	/* Now we set up the journal barrier. */
	jbd2_journal_lock_updates(journal);
4780

4781 4782 4783 4784 4785
	/*
	 * Don't clear the needs_recovery flag if we failed to flush
	 * the journal.
	 */
	error = jbd2_journal_flush(journal);
4786 4787
	if (error < 0)
		goto out;
4788 4789 4790 4791

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4792
out:
4793
	/* we rely on upper layer to stop further updates */
4794 4795
	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	return error;
4796 4797 4798 4799 4800 4801
}

/*
 * 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.
 */
4802
static int ext4_unfreeze(struct super_block *sb)
4803
{
4804 4805 4806 4807 4808 4809
	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);
4810
	return 0;
4811 4812
}

4813 4814 4815 4816 4817
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4818
	unsigned long s_mount_opt2;
4819 4820
	kuid_t s_resuid;
	kgid_t s_resgid;
4821 4822 4823 4824
	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
4825
	char *s_qf_names[EXT4_MAXQUOTAS];
4826 4827 4828
#endif
};

4829
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4830
{
4831
	struct ext4_super_block *es;
4832
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4833
	unsigned long old_sb_flags;
4834
	struct ext4_mount_options old_opts;
4835
	int enable_quota = 0;
4836
	ext4_group_t g;
4837
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4838
	int err = 0;
4839
#ifdef CONFIG_QUOTA
4840
	int i, j;
4841
#endif
4842
	char *orig_data = kstrdup(data, GFP_KERNEL);
4843 4844 4845 4846

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4847
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4848 4849 4850
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4851 4852
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4853 4854
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
J
Jan Kara 已提交
4855
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4856 4857 4858 4859 4860 4861
		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]);
4862
				kfree(orig_data);
4863 4864 4865 4866
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4867
#endif
4868 4869
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4870 4871 4872 4873

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4874
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4875 4876 4877 4878
		err = -EINVAL;
		goto restore_opts;
	}

4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893
	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;
		}
	}

4894
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4895
		ext4_abort(sb, "Abort forced by user");
4896 4897

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4898
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4899 4900 4901

	es = sbi->s_es;

4902
	if (sbi->s_journal) {
4903
		ext4_init_journal_params(sb, sbi->s_journal);
4904 4905
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4906

4907
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4908
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4909 4910 4911 4912 4913
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4914 4915 4916
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4917 4918
			err = dquot_suspend(sb, -1);
			if (err < 0)
4919 4920
				goto restore_opts;

4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931
			/*
			 * 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.
			 */
4932 4933
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4934 4935
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4936
			if (sbi->s_journal)
4937
				ext4_mark_recovery_complete(sb, es);
4938
		} else {
4939 4940
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4941 4942 4943
				err = -EROFS;
				goto restore_opts;
			}
4944 4945
			/*
			 * Make sure the group descriptor checksums
4946
			 * are sane.  If they aren't, refuse to remount r/w.
4947 4948 4949 4950 4951
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4952
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4953 4954
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4955 4956 4957 4958 4959 4960 4961
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4962 4963 4964 4965 4966 4967
			/*
			 * 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) {
4968
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4969 4970
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4971
				       "umount/remount instead");
4972 4973 4974 4975
				err = -EINVAL;
				goto restore_opts;
			}

4976 4977 4978 4979 4980 4981
			/*
			 * 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.)
			 */
4982 4983
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4984
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4985
			if (!ext4_setup_super(sb, es, 0))
4986
				sb->s_flags &= ~MS_RDONLY;
4987 4988 4989 4990 4991 4992 4993
			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;
				}
4994
			enable_quota = 1;
4995 4996
		}
	}
4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009

	/*
	 * 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);
	}

5010
	ext4_setup_system_zone(sb);
5011
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
5012
		ext4_commit_super(sb, 1);
5013

5014 5015
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
J
Jan Kara 已提交
5016
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
5017
		kfree(old_opts.s_qf_names[i]);
5018 5019 5020 5021 5022 5023
	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);
5024
			if (err)
5025 5026 5027
				goto restore_opts;
		}
	}
5028
#endif
5029 5030 5031

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
5032
	return 0;
5033

5034 5035 5036
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
5037
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5038 5039 5040
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
5041 5042
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
5043 5044
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
J
Jan Kara 已提交
5045
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5046
		kfree(sbi->s_qf_names[i]);
5047 5048 5049
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
5050
	kfree(orig_data);
5051 5052 5053
	return err;
}

5054
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5055 5056
{
	struct super_block *sb = dentry->d_sb;
5057 5058
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
5059
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
5060
	u64 fsid;
5061
	s64 bfree;
L
Lukas Czerner 已提交
5062
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5063

5064 5065
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
5066

5067
	buf->f_type = EXT4_SUPER_MAGIC;
5068
	buf->f_bsize = sb->s_blocksize;
5069
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5070 5071
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5072
	/* prevent underflow in case that few free space is available */
5073
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
5074 5075 5076
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5077 5078
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
5079
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5080
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
5081 5082 5083 5084
	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;
5085

5086 5087 5088
	return 0;
}

5089 5090
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
5091
 * Process 1                         Process 2
5092
 * ext4_create()                     quota_sync()
5093
 *   jbd2_journal_start()                  write_dquot()
5094
 *   dquot_initialize()                         down(dqio_mutex)
5095
 *     down(dqio_mutex)                    jbd2_journal_start()
5096 5097 5098 5099 5100 5101 5102
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
5103
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5104 5105
}

5106
static int ext4_write_dquot(struct dquot *dquot)
5107 5108 5109 5110 5111 5112
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
5113
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5114
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5115 5116 5117
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
5118
	err = ext4_journal_stop(handle);
5119 5120 5121 5122 5123
	if (!ret)
		ret = err;
	return ret;
}

5124
static int ext4_acquire_dquot(struct dquot *dquot)
5125 5126 5127 5128
{
	int ret, err;
	handle_t *handle;

5129
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5130
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5131 5132 5133
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
5134
	err = ext4_journal_stop(handle);
5135 5136 5137 5138 5139
	if (!ret)
		ret = err;
	return ret;
}

5140
static int ext4_release_dquot(struct dquot *dquot)
5141 5142 5143 5144
{
	int ret, err;
	handle_t *handle;

5145
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5146
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
5147 5148 5149
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
5150
		return PTR_ERR(handle);
J
Jan Kara 已提交
5151
	}
5152
	ret = dquot_release(dquot);
5153
	err = ext4_journal_stop(handle);
5154 5155 5156 5157 5158
	if (!ret)
		ret = err;
	return ret;
}

5159
static int ext4_mark_dquot_dirty(struct dquot *dquot)
5160
{
5161 5162 5163
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5164
	/* Are we journaling quotas? */
5165 5166
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5167
		dquot_mark_dquot_dirty(dquot);
5168
		return ext4_write_dquot(dquot);
5169 5170 5171 5172 5173
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5174
static int ext4_write_info(struct super_block *sb, int type)
5175 5176 5177 5178 5179
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5180
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5181 5182 5183
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5184
	err = ext4_journal_stop(handle);
5185 5186 5187 5188 5189 5190 5191 5192 5193
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5194
static int ext4_quota_on_mount(struct super_block *sb, int type)
5195
{
5196 5197
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5198 5199 5200 5201 5202
}

/*
 * Standard function to be called on quota_on
 */
5203
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5204
			 struct path *path)
5205 5206 5207 5208 5209
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5210

5211
	/* Quotafile not on the same filesystem? */
5212
	if (path->dentry->d_sb != sb)
5213
		return -EXDEV;
5214 5215
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5216
		/* Quotafile not in fs root? */
5217
		if (path->dentry->d_parent != sb->s_root)
5218 5219 5220
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5221
	}
5222 5223 5224 5225 5226

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5227
	if (EXT4_SB(sb)->s_journal &&
5228
	    ext4_should_journal_data(path->dentry->d_inode)) {
5229 5230 5231 5232 5233
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5234
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5235
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5236
		if (err)
5237
			return err;
5238 5239
	}

5240
	return dquot_quota_on(sb, type, format_id, path);
5241 5242
}

5243 5244 5245 5246 5247
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
5248
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263
		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
5264 5265
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5266 5267 5268 5269 5270 5271 5272 5273 5274 5275
	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
5276
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5277 5278 5279 5280 5281
		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
5282
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5283 5284 5285 5286 5287
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5288 5289 5290
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312
				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);
}

5313 5314
static int ext4_quota_off(struct super_block *sb, int type)
{
5315 5316 5317
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5318 5319 5320
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5321 5322
		sync_filesystem(sb);

5323 5324 5325
	if (!inode)
		goto out;

5326 5327
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5328
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5329 5330 5331 5332 5333 5334 5335
	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:
5336 5337 5338
	return dquot_quota_off(sb, type);
}

5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350
/*
 * 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);
}

5351 5352
/* 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
5353
 * itself serializes the operations (and no one else should touch the files)
5354
 * we don't have to be afraid of races */
5355
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5356 5357 5358
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5359
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373
	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;
5374 5375 5376
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391
		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) */
5392
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5393 5394 5395
				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
5396
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5397
	int err, offset = off & (sb->s_blocksize - 1);
5398 5399 5400
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5401
	if (EXT4_SB(sb)->s_journal && !handle) {
5402 5403
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5404 5405 5406
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417
	/*
	 * 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;
	}

5418 5419 5420
	bh = ext4_bread(handle, inode, blk, 1);
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5421 5422
	if (!bh)
		goto out;
5423
	BUFFER_TRACE(bh, "get write access");
5424 5425 5426
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5427
		return err;
5428
	}
5429 5430 5431 5432
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5433
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5434
	brelse(bh);
5435
out:
5436 5437
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5438
		EXT4_I(inode)->i_disksize = inode->i_size;
5439
		ext4_mark_inode_dirty(handle, inode);
5440
	}
5441
	return len;
5442 5443 5444 5445
}

#endif

A
Al Viro 已提交
5446 5447
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5448
{
A
Al Viro 已提交
5449
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5450 5451
}

5452
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464
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);
}
5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475

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;
}
5476 5477 5478
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5479
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5480 5481
#endif

5482
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494
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);
}
5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507

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;
}
5508 5509 5510
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5511
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5512 5513
#endif

T
Theodore Ts'o 已提交
5514 5515 5516
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5517
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5518 5519 5520
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5521
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5522

5523
static int __init ext4_init_feat_adverts(void)
5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546
{
	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;
}

5547 5548 5549 5550 5551 5552 5553
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5554 5555 5556 5557
/* 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];

5558
static int __init ext4_init_fs(void)
5559
{
5560
	int i, err;
5561

5562 5563 5564
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5565
	/* Build-time check for flags consistency */
5566
	ext4_check_flag_values();
5567 5568 5569 5570 5571 5572

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

5573
	err = ext4_init_es();
5574 5575
	if (err)
		return err;
5576 5577 5578 5579 5580

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

5581
	err = ext4_init_system_zone();
5582
	if (err)
5583
		goto out6;
T
Theodore Ts'o 已提交
5584
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5585 5586
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5587
		goto out5;
5588
	}
5589
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5590 5591

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5592 5593
	if (err)
		goto out4;
5594

5595
	err = ext4_init_mballoc();
5596 5597
	if (err)
		goto out2;
5598 5599
	else
		ext4_mballoc_ready = 1;
5600 5601 5602
	err = init_inodecache();
	if (err)
		goto out1;
5603
	register_as_ext3();
5604
	register_as_ext2();
T
Theodore Ts'o 已提交
5605
	err = register_filesystem(&ext4_fs_type);
5606 5607
	if (err)
		goto out;
5608

5609 5610
	return 0;
out:
5611 5612
	unregister_as_ext2();
	unregister_as_ext3();
5613 5614
	destroy_inodecache();
out1:
5615
	ext4_mballoc_ready = 0;
5616
	ext4_exit_mballoc();
5617
out2:
5618
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5619
out4:
5620 5621
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5622
	kset_unregister(ext4_kset);
5623
out5:
5624
	ext4_exit_system_zone();
5625
out6:
5626
	ext4_exit_pageio();
5627 5628 5629
out7:
	ext4_exit_es();

5630 5631 5632
	return err;
}

5633
static void __exit ext4_exit_fs(void)
5634
{
5635
	ext4_destroy_lazyinit_thread();
5636 5637
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5638
	unregister_filesystem(&ext4_fs_type);
5639
	destroy_inodecache();
5640
	ext4_exit_mballoc();
5641
	ext4_exit_feat_adverts();
5642
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5643
	kset_unregister(ext4_kset);
5644 5645
	ext4_exit_system_zone();
	ext4_exit_pageio();
5646
	ext4_exit_es();
5647 5648 5649
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5650
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5651
MODULE_LICENSE("GPL");
5652 5653
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)