super.c 154.6 KB
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/*
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 *  linux/fs/ext4/super.c
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 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
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#include <linux/vmalloc.h>
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#include <linux/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_load_journal(struct super_block *, struct ext4_super_block *,
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			     unsigned long journal_devnum);
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static int ext4_show_options(struct seq_file *seq, struct dentry *root);
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static int ext4_commit_super(struct super_block *sb, int sync);
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static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
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static int ext4_sync_fs(struct super_block *sb, int wait);
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static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
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static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
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static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
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static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
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static int ext4_feature_set_ok(struct super_block *sb, int readonly);
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static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
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static void ext4_clear_request_list(void);
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static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
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#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
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MODULE_ALIAS_FS("ext2");
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MODULE_ALIAS("ext2");
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#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


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

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

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

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

	return cpu_to_le32(csum);
}

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

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

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

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

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

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

	ret = kmalloc(size, flags);
	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);
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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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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;

	va_start(args, fmt);
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	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);
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	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,
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		      const char *fmt, ...)
{
	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);
	save_error_info(inode->i_sb, function, line);
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	va_start(args, fmt);
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	vaf.fmt = fmt;
	vaf.va = &args;
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	if (block)
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		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);
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	va_end(args);

	ext4_handle_error(inode->i_sb);
}

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void ext4_error_file(struct file *file, const char *function,
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		     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);
	save_error_info(inode->i_sb, function, line);
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	path = d_path(&(file->f_path), pathname, sizeof(pathname));
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	if (IS_ERR(path))
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		path = "(unknown)";
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	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
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	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);
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	va_end(args);

	ext4_handle_error(inode->i_sb);
}

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

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

	return errstr;
}

530
/* __ext4_std_error decodes expected errors from journaling functions
531 532
 * automatically and invokes the appropriate error response.  */

533 534
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
535 536 537 538 539 540 541 542 543 544 545
{
	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;

546
	errstr = ext4_decode_error(sb, errno, nbuf);
547 548
	printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
	       sb->s_id, function, line, errstr);
549
	save_error_info(sb, function, line);
550

551
	ext4_handle_error(sb);
552 553 554
}

/*
555
 * ext4_abort is a much stronger failure handler than ext4_error.  The
556 557 558 559 560 561 562 563
 * 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.
 */

564
void __ext4_abort(struct super_block *sb, const char *function,
565
		unsigned int line, const char *fmt, ...)
566 567 568
{
	va_list args;

569
	save_error_info(sb, function, line);
570
	va_start(args, fmt);
571 572
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
573 574 575 576
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

577 578 579
	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;
580 581 582 583 584 585
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
586 587 588 589
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
590
	if (test_opt(sb, ERRORS_PANIC))
591
		panic("EXT4-fs panic from previous error\n");
592 593
}

J
Joe Perches 已提交
594
void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
595
{
J
Joe Perches 已提交
596
	struct va_format vaf;
597 598 599
	va_list args;

	va_start(args, fmt);
J
Joe Perches 已提交
600 601 602
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
603 604 605
	va_end(args);
}

606
void __ext4_warning(struct super_block *sb, const char *function,
607
		    unsigned int line, const char *fmt, ...)
608
{
J
Joe Perches 已提交
609
	struct va_format vaf;
610 611 612
	va_list args;

	va_start(args, fmt);
J
Joe Perches 已提交
613 614 615 616
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
617 618 619
	va_end(args);
}

620 621 622 623
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, ...)
624 625 626
__releases(bitlock)
__acquires(bitlock)
{
J
Joe Perches 已提交
627
	struct va_format vaf;
628 629 630
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

631 632 633
	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
634

635
	va_start(args, fmt);
J
Joe Perches 已提交
636 637 638

	vaf.fmt = fmt;
	vaf.va = &args;
639
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
640 641
	       sb->s_id, function, line, grp);
	if (ino)
J
Joe Perches 已提交
642
		printk(KERN_CONT "inode %lu: ", ino);
643
	if (block)
J
Joe Perches 已提交
644 645
		printk(KERN_CONT "block %llu:", (unsigned long long) block);
	printk(KERN_CONT "%pV\n", &vaf);
646 647 648
	va_end(args);

	if (test_opt(sb, ERRORS_CONT)) {
649
		ext4_commit_super(sb, 0);
650 651
		return;
	}
652

653 654 655 656 657 658 659 660
	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
661
	 * ext4_grp_locked_error() to distinguish between the
662 663 664 665 666 667 668 669
	 * 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;
}

670
void ext4_update_dynamic_rev(struct super_block *sb)
671
{
672
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
673

674
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
675 676
		return;

677
	ext4_warning(sb,
678 679
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
680
		     EXT4_DYNAMIC_REV);
681

682 683 684
	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);
685 686 687 688 689 690 691 692 693 694 695 696 697
	/* 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
 */
698
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
699 700 701 702
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

703
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
704 705 706 707 708
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
709
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
710 711 712 713 714 715 716
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
A
Al Viro 已提交
717
static void ext4_blkdev_put(struct block_device *bdev)
718
{
A
Al Viro 已提交
719
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
720 721
}

A
Al Viro 已提交
722
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
723 724 725 726
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
A
Al Viro 已提交
727
		ext4_blkdev_put(bdev);
728 729 730 731 732 733
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
734
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
735 736
}

737
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
738 739 740
{
	struct list_head *l;

741 742
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
743 744 745 746 747 748 749 750 751 752 753 754

	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));
	}
}

755
static void ext4_put_super(struct super_block *sb)
756
{
757 758
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
759
	int i, err;
760

761
	ext4_unregister_li_request(sb);
762 763
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

764 765 766 767
	flush_workqueue(sbi->unrsv_conversion_wq);
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->unrsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
768

769 770 771 772
	if (sbi->s_journal) {
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
		if (err < 0)
773
			ext4_abort(sb, "Couldn't clean up the journal");
774
	}
775

776
	ext4_es_unregister_shrinker(sb);
777
	del_timer(&sbi->s_err_report);
778 779 780 781 782
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

783
	if (!(sb->s_flags & MS_RDONLY)) {
784
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
785 786
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
787
	if (!(sb->s_flags & MS_RDONLY))
788 789
		ext4_commit_super(sb, 1);

790
	if (sbi->s_proc) {
791
		remove_proc_entry("options", sbi->s_proc);
792
		remove_proc_entry(sb->s_id, ext4_proc_root);
793
	}
T
Theodore Ts'o 已提交
794
	kobject_del(&sbi->s_kobj);
795 796 797

	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
798
	ext4_kvfree(sbi->s_group_desc);
799
	ext4_kvfree(sbi->s_flex_groups);
800
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
801 802
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
803
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
804
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
805 806 807 808 809 810 811 812 813 814 815 816 817 818
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

819
	invalidate_bdev(sb->s_bdev);
820 821 822 823 824 825 826
	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);
827
		invalidate_bdev(sbi->journal_bdev);
828
		ext4_blkdev_remove(sbi);
829
	}
830 831
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
832
	sb->s_fs_info = NULL;
T
Theodore Ts'o 已提交
833 834 835 836 837 838
	/*
	 * 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);
839 840
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
841
	kfree(sbi->s_blockgroup_lock);
842 843 844
	kfree(sbi);
}

845
static struct kmem_cache *ext4_inode_cachep;
846 847 848 849

/*
 * Called inside transaction, so use GFP_NOFS
 */
850
static struct inode *ext4_alloc_inode(struct super_block *sb)
851
{
852
	struct ext4_inode_info *ei;
853

C
Christoph Lameter 已提交
854
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
855 856
	if (!ei)
		return NULL;
857

858
	ei->vfs_inode.i_version = 1;
859 860
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
Z
Zheng Liu 已提交
861 862
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
863 864
	INIT_LIST_HEAD(&ei->i_es_lru);
	ei->i_es_lru_nr = 0;
865 866 867
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
868
	ei->i_da_metadata_calc_len = 0;
869
	ei->i_da_metadata_calc_last_lblock = 0;
870
	spin_lock_init(&(ei->i_block_reservation_lock));
871 872 873
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
#endif
874
	ei->jinode = NULL;
875 876
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
	INIT_LIST_HEAD(&ei->i_unrsv_conversion_list);
877
	spin_lock_init(&ei->i_completed_io_lock);
878 879
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
880
	atomic_set(&ei->i_ioend_count, 0);
881
	atomic_set(&ei->i_unwritten, 0);
882 883
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
	INIT_WORK(&ei->i_unrsv_conversion_work, ext4_end_io_unrsv_work);
884

885 886 887
	return &ei->vfs_inode;
}

888 889 890 891 892 893 894 895
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
896 897 898 899 900 901
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));
}

902
static void ext4_destroy_inode(struct inode *inode)
903
{
904
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
905 906 907
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
908 909 910 911 912
		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
913
	call_rcu(&inode->i_rcu, ext4_i_callback);
914 915
}

916
static void init_once(void *foo)
917
{
918
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
919

C
Christoph Lameter 已提交
920 921
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
922
	init_rwsem(&ei->i_data_sem);
C
Christoph Lameter 已提交
923
	inode_init_once(&ei->vfs_inode);
924 925 926 927
}

static int init_inodecache(void)
{
928 929
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
930 931
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
932
					     init_once);
933
	if (ext4_inode_cachep == NULL)
934 935 936 937 938 939
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
940 941 942 943 944
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
945
	kmem_cache_destroy(ext4_inode_cachep);
946 947
}

A
Al Viro 已提交
948
void ext4_clear_inode(struct inode *inode)
949
{
A
Al Viro 已提交
950
	invalidate_inode_buffers(inode);
951
	clear_inode(inode);
952
	dquot_drop(inode);
953
	ext4_discard_preallocations(inode);
954
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
955
	ext4_es_lru_del(inode);
956 957 958 959 960 961
	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;
	}
962 963
}

C
Christoph Hellwig 已提交
964
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
965
					u64 ino, u32 generation)
966 967 968
{
	struct inode *inode;

969
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
970
		return ERR_PTR(-ESTALE);
971
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
972 973 974 975
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
976
	 * ext4_read_inode will return a bad_inode if the inode had been
977 978 979 980 981
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
982 983 984 985
	inode = ext4_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
986 987 988
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
C
Christoph Hellwig 已提交
989 990 991 992 993

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
994
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
995 996 997 998 999 1000
{
	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,
1001
					int fh_len, int fh_type)
C
Christoph Hellwig 已提交
1002 1003 1004
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1005 1006
}

1007 1008 1009 1010 1011 1012
/*
 * 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.
 */
1013 1014
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
{
	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);
}

1027
#ifdef CONFIG_QUOTA
1028
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1029
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1030

1031 1032 1033 1034 1035
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);
1036
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1037
			 struct path *path);
1038 1039
static int ext4_quota_on_sysfile(struct super_block *sb, int type,
				 int format_id);
1040
static int ext4_quota_off(struct super_block *sb, int type);
1041
static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1042 1043
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,
1044
			       size_t len, loff_t off);
1045
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1046
				const char *data, size_t len, loff_t off);
1047 1048 1049
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);
1050

1051
static const struct dquot_operations ext4_quota_operations = {
1052
	.get_reserved_space = ext4_get_reserved_space,
1053 1054 1055 1056
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1057 1058 1059
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1060 1061
};

1062
static const struct quotactl_ops ext4_qctl_operations = {
1063
	.quota_on	= ext4_quota_on,
1064
	.quota_off	= ext4_quota_off,
1065 1066 1067 1068 1069
	.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
1070
};
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080

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
};
1081 1082
#endif

1083
static const struct super_operations ext4_sops = {
1084 1085 1086 1087
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1088
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1089
	.evict_inode	= ext4_evict_inode,
1090 1091
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1092 1093
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1094 1095 1096
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1097
#ifdef CONFIG_QUOTA
1098 1099
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1100
#endif
1101
	.bdev_try_to_free_page = bdev_try_to_free_page,
1102 1103
};

1104 1105 1106 1107 1108
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,
1109
	.drop_inode	= ext4_drop_inode,
A
Al Viro 已提交
1110
	.evict_inode	= ext4_evict_inode,
1111
	.sync_fs	= ext4_sync_fs_nojournal,
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
	.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,
};

1123
static const struct export_operations ext4_export_ops = {
C
Christoph Hellwig 已提交
1124 1125
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1126
	.get_parent = ext4_get_parent,
1127 1128 1129 1130 1131
};

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,
1132
	Opt_nouid32, Opt_debug, Opt_removed,
1133
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1134
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1135
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1136
	Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1137
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1138
	Opt_data_err_abort, Opt_data_err_ignore,
1139
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
J
Jan Kara 已提交
1140
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
T
Theodore Ts'o 已提交
1141
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1142
	Opt_usrquota, Opt_grpquota, Opt_i_version,
1143 1144
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1145
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1146
	Opt_dioread_nolock, Opt_dioread_lock,
1147
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1148
	Opt_max_dir_size_kb,
1149 1150
};

1151
static const match_table_t tokens = {
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
	{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"},
1166 1167
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1168 1169 1170 1171
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1172
	{Opt_noload, "norecovery"},
1173
	{Opt_noload, "noload"},
1174 1175
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1176
	{Opt_commit, "commit=%u"},
1177 1178
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1179
	{Opt_journal_dev, "journal_dev=%u"},
1180 1181
	{Opt_journal_checksum, "journal_checksum"},
	{Opt_journal_async_commit, "journal_async_commit"},
1182 1183 1184 1185
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1186 1187
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1188 1189 1190 1191 1192 1193
	{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
1194
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1195 1196 1197 1198 1199
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
T
Theodore Ts'o 已提交
1200 1201
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1202
	{Opt_i_version, "i_version"},
1203
	{Opt_stripe, "stripe=%u"},
1204
	{Opt_delalloc, "delalloc"},
1205
	{Opt_nodelalloc, "nodelalloc"},
1206 1207
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1208 1209
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1210
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1211
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1212
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
T
Theodore Ts'o 已提交
1213 1214
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1215 1216
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1217 1218
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1219 1220 1221
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1222
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1223 1224 1225 1226 1227
	{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
1228
	{Opt_err, NULL},
1229 1230
};

1231
static ext4_fsblk_t get_sb_block(void **data)
1232
{
1233
	ext4_fsblk_t	sb_block;
1234 1235 1236 1237
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1238

1239
	options += 3;
1240
	/* TODO: use simple_strtoll with >32bit ext4 */
1241 1242
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1243
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1244 1245 1246 1247 1248 1249
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1250

1251 1252 1253
	return sb_block;
}

1254
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1255 1256
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";
1257

D
Dmitry Monakhov 已提交
1258 1259 1260 1261 1262
#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;
1263
	int ret = -1;
D
Dmitry Monakhov 已提交
1264 1265 1266 1267 1268 1269

	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");
1270
		return -1;
D
Dmitry Monakhov 已提交
1271
	}
1272 1273 1274 1275 1276
	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
1277 1278 1279 1280
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1281
		return -1;
D
Dmitry Monakhov 已提交
1282
	}
1283 1284 1285 1286 1287 1288 1289 1290
	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
1291
	}
1292
	if (strchr(qname, '/')) {
D
Dmitry Monakhov 已提交
1293 1294
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1295
		goto errout;
D
Dmitry Monakhov 已提交
1296
	}
1297
	sbi->s_qf_names[qtype] = qname;
1298
	set_opt(sb, QUOTA);
D
Dmitry Monakhov 已提交
1299
	return 1;
1300 1301 1302
errout:
	kfree(qname);
	return ret;
D
Dmitry Monakhov 已提交
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
}

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");
1314
		return -1;
D
Dmitry Monakhov 已提交
1315
	}
1316
	kfree(sbi->s_qf_names[qtype]);
D
Dmitry Monakhov 已提交
1317 1318 1319 1320 1321
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1322 1323 1324 1325 1326 1327
#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
1328
#ifdef CONFIG_QUOTA
1329 1330 1331 1332 1333
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1334
#endif
1335
#define MOPT_DATAJ	0x0080
1336 1337 1338
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350

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},
1351 1352 1353 1354
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1355 1356
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1357 1358 1359 1360 1361 1362
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_CLEAR | MOPT_EXPLICIT},
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_SET},
1363
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1364 1365 1366
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1367 1368 1369
	{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},
1370 1371 1372 1373
	{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},
1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
	{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},
1385 1386 1387 1388
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
	{Opt_journal_dev, 0, MOPT_GTE0},
	{Opt_journal_ioprio, 0, MOPT_GTE0},
1389 1390 1391 1392
	{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},
1393 1394
	{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
1395
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1396 1397
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1398
#else
1399 1400
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1401
#endif
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
	{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},
1418
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1419 1420 1421 1422 1423 1424 1425 1426 1427
	{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;
1428 1429
	kuid_t uid;
	kgid_t gid;
1430 1431
	int arg = 0;

1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
#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
1442
	switch (token) {
1443 1444 1445 1446
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1447 1448 1449
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1450
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1451 1452 1453 1454 1455 1456 1457 1458 1459
		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;
	}

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
	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;
	}

1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
	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;
	}

1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
	if (args->from && match_int(args, &arg))
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
	if (m->flags & MOPT_EXPLICIT)
		set_opt2(sb, EXPLICIT_DELALLOC);
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		if (arg == 0)
			arg = EXT4_DEF_MAX_BATCH_TIME;
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1508 1509 1510 1511
		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");
1512
			return -1;
1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
		}
		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);
1528 1529
			return -1;
		}
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557
		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;
	} 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) {
1558
				ext4_msg(sb, KERN_ERR,
1559 1560
					 "Cannot change data mode on remount");
				return -1;
1561
			}
1562
		} else {
1563 1564
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1565
		}
1566 1567 1568 1569 1570 1571 1572 1573
#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;
		}
1574 1575 1576 1577 1578 1579 1580
		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;
		}
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
		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;
1598
	}
1599
	return 1;
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621
}

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.
		 */
1622
		args[0].to = args[0].from = NULL;
1623 1624 1625 1626
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1627 1628
	}
#ifdef CONFIG_QUOTA
1629 1630 1631 1632 1633 1634
	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;
	}
1635
	if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1636
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1637
			clear_opt(sb, USRQUOTA);
1638

1639
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1640
			clear_opt(sb, GRPQUOTA);
1641

D
Dmitry Monakhov 已提交
1642
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1643 1644
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1645 1646 1647 1648
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1649 1650
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1651 1652 1653 1654
			return 0;
		}
	} else {
		if (sbi->s_jquota_fmt) {
1655
			ext4_msg(sb, KERN_ERR, "journaled quota format "
1656
					"specified with no journaling "
1657
					"enabled");
1658 1659 1660 1661
			return 0;
		}
	}
#endif
J
Jan Kara 已提交
1662 1663 1664 1665 1666 1667 1668 1669 1670 1671
	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;
		}
	}
1672 1673 1674
	return 1;
}

1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711
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]);

	if (test_opt(sb, USRQUOTA))
		seq_puts(seq, ",usrquota");

	if (test_opt(sb, GRPQUOTA))
		seq_puts(seq, ",grpquota");
#endif
}

1712 1713
static const char *token2str(int token)
{
1714
	const struct match_token *t;
1715 1716 1717 1718 1719 1720 1721

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

1722 1723 1724 1725 1726
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1727 1728
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1729 1730 1731
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1732
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1733
	const struct mount_opts *m;
1734
	char sep = nodefs ? '\n' : ',';
1735

1736 1737
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1738 1739

	if (sbi->s_sb_block != 1)
1740 1741 1742 1743 1744 1745 1746
		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;
1747
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1748 1749 1750 1751 1752 1753
			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));
1754
	}
1755

1756
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1757
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1758 1759 1760
		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)) ||
1761
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1762 1763
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1764
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1765 1766
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1767
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1768
		SEQ_OPTS_PUTS("errors=continue");
1769
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1770
		SEQ_OPTS_PUTS("errors=panic");
1771
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1772
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1773
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1774
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1775
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1776
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1777
	if (sb->s_flags & MS_I_VERSION)
1778
		SEQ_OPTS_PUTS("i_version");
1779
	if (nodefs || sbi->s_stripe)
1780
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1781
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1782 1783 1784 1785 1786 1787 1788
		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");
	}
1789 1790
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1791 1792
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1793

1794 1795
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1796
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1797 1798
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1799 1800 1801 1802 1803

	ext4_show_quota_options(seq, sb);
	return 0;
}

1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821
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
1822
	return single_open(file, options_seq_show, PDE_DATA(inode));
1823 1824 1825 1826 1827 1828 1829 1830 1831 1832
}

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,
};

1833
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1834 1835
			    int read_only)
{
1836
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1837 1838
	int res = 0;

1839
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1840 1841
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1842 1843 1844
		res = MS_RDONLY;
	}
	if (read_only)
1845
		goto done;
1846
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1847 1848
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1849
	else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1850 1851 1852
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1853
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1854 1855
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1856 1857 1858
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1859 1860 1861
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1862 1863 1864
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1865
	if (!sbi->s_journal)
1866
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1867
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1868
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
M
Marcin Slusarz 已提交
1869
	le16_add_cpu(&es->s_mnt_count, 1);
1870
	es->s_mtime = cpu_to_le32(get_seconds());
1871
	ext4_update_dynamic_rev(sb);
1872 1873
	if (sbi->s_journal)
		EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1874

1875
	ext4_commit_super(sb, 1);
1876
done:
1877
	if (test_opt(sb, DEBUG))
1878
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1879
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1880 1881
			sb->s_blocksize,
			sbi->s_groups_count,
1882 1883
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1884
			sbi->s_mount_opt, sbi->s_mount_opt2);
1885

D
Dan Magenheimer 已提交
1886
	cleancache_init_fs(sb);
1887 1888 1889
	return res;
}

1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
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;
}

1922 1923 1924 1925 1926
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;
1927
	int i, err;
1928

1929
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1930
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1931 1932 1933 1934
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

1935 1936
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
1937
		goto failed;
1938 1939

	for (i = 0; i < sbi->s_groups_count; i++) {
1940
		gdp = ext4_get_group_desc(sb, i, NULL);
1941 1942

		flex_group = ext4_flex_group(sbi, i);
1943 1944
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
1945 1946
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
1947 1948
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
1949 1950 1951 1952 1953 1954 1955
	}

	return 1;
failed:
	return 0;
}

1956 1957
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
1958
{
1959
	int offset;
A
Andreas Dilger 已提交
1960
	__u16 crc = 0;
1961
	__le32 le_group = cpu_to_le32(block_group);
A
Andreas Dilger 已提交
1962

1963 1964 1965
	if ((sbi->s_es->s_feature_ro_compat &
	     cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
		/* Use new metadata_csum algorithm */
1966
		__le16 save_csum;
1967 1968
		__u32 csum32;

1969
		save_csum = gdp->bg_checksum;
1970 1971 1972 1973 1974
		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);
1975
		gdp->bg_checksum = save_csum;
1976 1977 1978

		crc = csum32 & 0xFFFF;
		goto out;
A
Andreas Dilger 已提交
1979 1980
	}

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
	/* 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
1997 1998 1999
	return cpu_to_le16(crc);
}

2000
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
A
Andreas Dilger 已提交
2001 2002
				struct ext4_group_desc *gdp)
{
2003 2004 2005
	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
2006 2007 2008 2009 2010
		return 0;

	return 1;
}

2011 2012 2013 2014 2015 2016 2017 2018
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);
}

2019
/* Called at mount-time, super-block is locked */
2020 2021
static int ext4_check_descriptors(struct super_block *sb,
				  ext4_group_t *first_not_zeroed)
2022
{
2023 2024 2025
	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
2026 2027 2028
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
J
Jose R. Santos 已提交
2029
	int flexbg_flag = 0;
2030
	ext4_group_t i, grp = sbi->s_groups_count;
2031

J
Jose R. Santos 已提交
2032 2033 2034
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		flexbg_flag = 1;

2035
	ext4_debug("Checking group descriptors");
2036

2037 2038 2039
	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
2040
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
L
Laurent Vivier 已提交
2041
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2042 2043
		else
			last_block = first_block +
2044
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2045

2046 2047 2048 2049
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2050
		block_bitmap = ext4_block_bitmap(sb, gdp);
2051
		if (block_bitmap < first_block || block_bitmap > last_block) {
2052
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2053
			       "Block bitmap for group %u not in group "
2054
			       "(block %llu)!", i, block_bitmap);
2055 2056
			return 0;
		}
2057
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2058
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2059
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2060
			       "Inode bitmap for group %u not in group "
2061
			       "(block %llu)!", i, inode_bitmap);
2062 2063
			return 0;
		}
2064
		inode_table = ext4_inode_table(sb, gdp);
L
Laurent Vivier 已提交
2065
		if (inode_table < first_block ||
2066
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2067
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2068
			       "Inode table for group %u not in group "
2069
			       "(block %llu)!", i, inode_table);
2070 2071
			return 0;
		}
2072
		ext4_lock_group(sb, i);
2073
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2074 2075 2076 2077
			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));
2078
			if (!(sb->s_flags & MS_RDONLY)) {
2079
				ext4_unlock_group(sb, i);
2080
				return 0;
2081
			}
A
Andreas Dilger 已提交
2082
		}
2083
		ext4_unlock_group(sb, i);
J
Jose R. Santos 已提交
2084 2085
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2086
	}
2087 2088
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2089

2090 2091
	ext4_free_blocks_count_set(sbi->s_es,
				   EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2092
	sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2093 2094 2095
	return 1;
}

2096
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
 * 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
2109
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2110 2111 2112
 * 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.
 */
2113 2114
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125
{
	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;
	}

2126
	if (bdev_read_only(sb->s_bdev)) {
2127 2128
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2129 2130 2131
		return;
	}

2132 2133 2134 2135 2136 2137 2138
	/* 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;
	}

2139
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2140 2141
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2142 2143
			jbd_debug(1, "Errors on filesystem, "
				  "clearing orphan list.\n");
2144 2145
			es->s_last_orphan = 0;
		}
2146 2147 2148 2149 2150
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2151
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2152 2153 2154 2155 2156 2157 2158
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
	/* Turn on quotas so that they are updated correctly */
	for (i = 0; i < MAXQUOTAS; i++) {
2159 2160
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2161
			if (ret < 0)
2162 2163 2164
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
					"quota: error %d", ret);
2165 2166 2167 2168 2169 2170 2171
		}
	}
#endif

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

2172 2173
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2174 2175 2176 2177
			es->s_last_orphan = 0;
			break;
		}

2178
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2179
		dquot_initialize(inode);
2180
		if (inode->i_nlink) {
2181 2182 2183 2184
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2185
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2186
				  inode->i_ino, inode->i_size);
2187
			mutex_lock(&inode->i_mutex);
2188
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2189
			ext4_truncate(inode);
2190
			mutex_unlock(&inode->i_mutex);
2191 2192
			nr_truncates++;
		} else {
2193 2194 2195 2196
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2197 2198 2199 2200 2201 2202 2203
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2204
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2205 2206

	if (nr_orphans)
2207 2208
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2209
	if (nr_truncates)
2210 2211
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2212 2213 2214 2215
#ifdef CONFIG_QUOTA
	/* Turn quotas off */
	for (i = 0; i < MAXQUOTAS; i++) {
		if (sb_dqopt(sb)->files[i])
2216
			dquot_quota_off(sb, i);
2217 2218 2219 2220
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2221

2222 2223 2224 2225 2226 2227 2228
/*
 * 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.
 *
2229 2230 2231 2232 2233 2234
 * 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.
 *
2235 2236
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2237
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2238 2239 2240 2241 2242
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2243
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2244
		/*
2245
		 * CONFIG_LBDAF is not enabled implies the inode
2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
		 * 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;
	}

2256 2257 2258 2259 2260 2261
	/*
	 * 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;
2262 2263 2264 2265 2266 2267 2268 2269
	res <<= blkbits;

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

	return res;
}
2270 2271

/*
2272
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2273 2274
 * 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.
2275
 */
2276
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2277
{
2278
	loff_t res = EXT4_NDIR_BLOCKS;
2279 2280
	int meta_blocks;
	loff_t upper_limit;
2281 2282 2283 2284 2285 2286
	/* 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.
2287 2288
	 */

2289
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2290
		/*
2291
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2292 2293
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2294 2295 2296 2297 2298 2299 2300
		 */
		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
2301 2302 2303 2304 2305 2306
		/*
		 * 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
		 */
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319
		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;
2320 2321 2322 2323 2324 2325 2326

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2327 2328 2329 2330

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2331 2332 2333
	return res;
}

2334
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2335
				   ext4_fsblk_t logical_sb_block, int nr)
2336
{
2337
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2338
	ext4_group_t bg, first_meta_bg;
2339 2340 2341 2342
	int has_super = 0;

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

2343
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2344
	    nr < first_meta_bg)
2345
		return logical_sb_block + nr + 1;
2346
	bg = sbi->s_desc_per_block * nr;
2347
	if (ext4_bg_has_super(sb, bg))
2348
		has_super = 1;
2349

2350
	return (has_super + ext4_group_first_block_no(sb, bg));
2351 2352
}

2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
/**
 * 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
2369
	int ret;
2370 2371

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
D
Dan Ehrenberg 已提交
2372 2373 2374 2375 2376 2377 2378
		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;
2379

D
Dan Ehrenberg 已提交
2380 2381 2382 2383 2384 2385
	/*
	 * 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;
2386

D
Dan Ehrenberg 已提交
2387
	return ret;
2388
}
2389

T
Theodore Ts'o 已提交
2390 2391 2392 2393 2394
/* sysfs supprt */

struct ext4_attr {
	struct attribute attr;
	ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2395
	ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
T
Theodore Ts'o 已提交
2396
			 const char *, size_t);
2397 2398 2399 2400
	union {
		int offset;
		int deprecated_val;
	} u;
T
Theodore Ts'o 已提交
2401 2402
};

L
Lukas Czerner 已提交
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
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
2414 2415 2416 2417 2418
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",
2419 2420
		(s64) EXT4_C2B(sbi,
			percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
T
Theodore Ts'o 已提交
2421 2422 2423 2424 2425 2426 2427
}

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;

2428 2429
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
	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;

2440 2441
	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
T
Theodore Ts'o 已提交
2442
	return snprintf(buf, PAGE_SIZE, "%llu\n",
2443
			(unsigned long long)(sbi->s_kbytes_written +
T
Theodore Ts'o 已提交
2444
			((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2445
			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
T
Theodore Ts'o 已提交
2446 2447 2448 2449 2450 2451 2452
}

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;
2453
	int ret;
T
Theodore Ts'o 已提交
2454

2455 2456 2457
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
T
Theodore Ts'o 已提交
2458

2459
	if (t && (!is_power_of_2(t) || t > 0x40000000))
T
Theodore Ts'o 已提交
2460 2461 2462 2463 2464 2465 2466
		return -EINVAL;

	sbi->s_inode_readahead_blks = t;
	return count;
}

static ssize_t sbi_ui_show(struct ext4_attr *a,
2467
			   struct ext4_sb_info *sbi, char *buf)
T
Theodore Ts'o 已提交
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{
2469
	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)
{
2478
	unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
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Theodore Ts'o 已提交
2479
	unsigned long t;
2480
	int ret;
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2482 2483 2484
	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;
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	*ui = t;
	return count;
}

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

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

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

	return ret ? ret : count;
}

2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526
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;
}

2527 2528 2529 2530 2531 2532
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,					\
2538 2539 2540
	.u = {							\
		.offset = offsetof(struct ext4_sb_info, _elname),\
	},							\
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}
#define EXT4_ATTR(name, mode, show, store) \
static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)

2545
#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
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#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
#define EXT4_RW_ATTR_SBI_UI(name, elname)	\
	EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
#define ATTR_LIST(name) &ext4_attr_##name.attr
2551 2552 2553 2554 2555 2556 2557 2558
#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);
2566
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);
2573
EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2574
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2575
EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
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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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2582
	ATTR_LIST(inode_readahead_blks),
2583
	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),
2590
	ATTR_LIST(max_writeback_mb_bump),
2591
	ATTR_LIST(extent_max_zeroout_kb),
2592
	ATTR_LIST(trigger_fs_error),
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2593 2594 2595
	NULL,
};

2596 2597
/* Features this copy of ext4 supports */
EXT4_INFO_ATTR(lazy_itable_init);
2598
EXT4_INFO_ATTR(batched_discard);
2599
EXT4_INFO_ATTR(meta_bg_resize);
2600 2601 2602

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
2603
	ATTR_LIST(batched_discard),
2604
	ATTR_LIST(meta_bg_resize),
2605 2606 2607
	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);
}

2636
static const struct sysfs_ops ext4_attr_ops = {
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2637 2638 2639 2640 2641 2642 2643 2644 2645 2646
	.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,
};

2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657
static void ext4_feat_release(struct kobject *kobj)
{
	complete(&ext4_feat->f_kobj_unregister);
}

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

2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
/*
 * 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;
		}
	}
2698 2699 2700 2701 2702 2703 2704
	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;
	}
2705 2706 2707 2708 2709 2710 2711 2712 2713 2714

#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 */
2715 2716 2717
	return 1;
}

2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764
/*
 * This function is called once a day if we have errors logged
 * on the file system
 */
static void print_daily_error_info(unsigned long arg)
{
	struct super_block *sb = (struct super_block *) arg;
	struct ext4_sb_info *sbi;
	struct ext4_super_block *es;

	sbi = EXT4_SB(sb);
	es = sbi->s_es;

	if (es->s_error_count)
		ext4_msg(sb, KERN_NOTICE, "error count: %u",
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
		printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776
/* 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;

2777
	sb_start_write(sb);
2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788
	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;
	}

2789
	if (group >= ngroups)
2790 2791 2792 2793 2794 2795 2796
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2797 2798
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2799 2800 2801 2802 2803
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2804
	sb_end_write(sb);
2805 2806 2807 2808 2809 2810

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2811
 * request structure. Should be called with li_list_mtx held
2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828
 */
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)
{
2829 2830 2831
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2832
		return;
2833
	}
2834 2835

	mutex_lock(&ext4_li_info->li_list_mtx);
2836
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2837
	mutex_unlock(&ext4_li_info->li_list_mtx);
2838
	mutex_unlock(&ext4_li_mtx);
2839 2840
}

2841 2842
static struct task_struct *ext4_lazyinit_task;

2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
/*
 * 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;
2857
	unsigned long next_wakeup, cur;
2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874

	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);

2875 2876 2877 2878 2879 2880
			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;
				}
2881 2882 2883 2884 2885 2886 2887
			}

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

2888
		try_to_freeze();
2889

2890 2891
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2892
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2893 2894 2895 2896
			cond_resched();
			continue;
		}

2897 2898
		schedule_timeout_interruptible(next_wakeup - cur);

2899 2900 2901 2902
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944
	}

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)
{
2945 2946 2947 2948
	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);
2949 2950 2951
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2952
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028
				 "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;
	unsigned long rnd;

	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.
	 */
	get_random_bytes(&rnd, sizeof(rnd));
	elr->lr_next_sched = jiffies + (unsigned long)rnd %
			     (EXT4_DEF_LI_MAX_START_DELAY * HZ);

	return elr;
}

3029 3030
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
3031 3032
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3033
	struct ext4_li_request *elr = NULL;
3034
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3035
	int ret = 0;
3036

3037
	mutex_lock(&ext4_li_mtx);
3038 3039 3040 3041 3042 3043
	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;
3044
		goto out;
3045
	}
3046 3047 3048

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
3049
	    !test_opt(sb, INIT_INODE_TABLE))
3050
		goto out;
3051 3052

	elr = ext4_li_request_new(sb, first_not_zeroed);
3053 3054 3055 3056
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068

	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;
3069 3070 3071 3072 3073 3074
	/*
	 * 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;
3075 3076 3077 3078 3079 3080 3081

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
3082 3083
	mutex_unlock(&ext4_li_mtx);
	if (ret)
3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097
		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.
	 */
3098
	if (!ext4_li_info || !ext4_lazyinit_task)
3099 3100
		return;

3101
	kthread_stop(ext4_lazyinit_task);
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
static int set_journal_csum_feature_set(struct super_block *sb)
{
	int ret = 1;
	int compat, incompat;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

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

	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				incompat);
	} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				incompat);
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else {
		jbd2_journal_clear_features(sbi->s_journal,
				JBD2_FEATURE_COMPAT_CHECKSUM, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				JBD2_FEATURE_INCOMPAT_CSUM_V2);
	}

	return ret;
}

3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165
/*
 * 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;

3166 3167 3168 3169
	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);

3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246
	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();
	}
3247 3248
	/* Add the journal blocks as well */
	if (sbi->s_journal)
3249
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3250

3251 3252 3253 3254 3255 3256
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

L
Lukas Czerner 已提交
3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290

static ext4_fsblk_t ext4_calculate_resv_clusters(struct ext4_sb_info *sbi)
{
	ext4_fsblk_t resv_clusters;

	/*
	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
	 * This should cover the situations where we can not afford to run
	 * out of space like for example punch hole, or converting
	 * uninitialized extents in delalloc path. In most cases such
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
	resv_clusters = ext4_blocks_count(sbi->s_es) >> sbi->s_cluster_bits;

	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;
}

3291
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3292
{
3293
	char *orig_data = kstrdup(data, GFP_KERNEL);
3294
	struct buffer_head *bh;
3295 3296 3297 3298
	struct ext4_super_block *es = NULL;
	struct ext4_sb_info *sbi;
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3299
	ext4_fsblk_t logical_sb_block;
3300 3301 3302 3303
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3304
	char *cp;
3305
	const char *descr;
3306
	int ret = -ENOMEM;
3307
	int blocksize, clustersize;
3308 3309
	unsigned int db_count;
	unsigned int i;
3310
	int needs_recovery, has_huge_files, has_bigalloc;
L
Laurent Vivier 已提交
3311
	__u64 blocks_count;
3312
	int err = 0;
3313
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3314
	ext4_group_t first_not_zeroed;
3315 3316 3317

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
3318
		goto out_free_orig;
3319 3320 3321 3322 3323

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
3324
		goto out_free_orig;
3325
	}
3326
	sb->s_fs_info = sbi;
3327
	sbi->s_sb = sb;
3328
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
M
Miklos Szeredi 已提交
3329
	sbi->s_sb_block = sb_block;
3330 3331 3332
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3333

3334 3335 3336 3337
	/* Cleanup superblock name */
	for (cp = sb->s_id; (cp = strchr(cp, '/'));)
		*cp = '!';

3338
	/* -EINVAL is default */
3339
	ret = -EINVAL;
3340
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3341
	if (!blocksize) {
3342
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3343 3344 3345 3346
		goto out_fail;
	}

	/*
3347
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3348 3349
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3350
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3351 3352
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3353
	} else {
3354
		logical_sb_block = sb_block;
3355 3356
	}

3357
	if (!(bh = sb_bread(sb, logical_sb_block))) {
3358
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3359 3360 3361 3362
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3363
	 *       some ext4 macro-instructions depend on its value
3364
	 */
3365
	es = (struct ext4_super_block *) (bh->b_data + offset);
3366 3367
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3368 3369
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
T
Theodore Ts'o 已提交
3370
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3371

3372 3373 3374 3375 3376 3377 3378
	/* 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.");

3379 3380 3381 3382 3383 3384 3385 3386
	/* 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;
	}

3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398
	/* 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;
		}
	}

3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412
	/* 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));

3413 3414
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3415
	set_opt(sb, INIT_INODE_TABLE);
3416
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3417
		set_opt(sb, DEBUG);
3418
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3419
		set_opt(sb, GRPID);
3420
	if (def_mount_opts & EXT4_DEFM_UID16)
3421
		set_opt(sb, NO_UID32);
3422 3423
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
T
Theodore Ts'o 已提交
3424
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3425
	set_opt(sb, POSIX_ACL);
3426
#endif
3427
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3428
		set_opt(sb, JOURNAL_DATA);
3429
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3430
		set_opt(sb, ORDERED_DATA);
3431
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3432
		set_opt(sb, WRITEBACK_DATA);
3433 3434

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3435
		set_opt(sb, ERRORS_PANIC);
3436
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3437
		set_opt(sb, ERRORS_CONT);
3438
	else
3439
		set_opt(sb, ERRORS_RO);
3440
	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3441
		set_opt(sb, BLOCK_VALIDITY);
3442
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3443
		set_opt(sb, DISCARD);
3444

3445 3446
	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));
3447 3448 3449
	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;
3450

3451
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3452
		set_opt(sb, BARRIER);
3453

3454 3455 3456 3457
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3458
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3459
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3460
		set_opt(sb, DELALLOC);
3461

3462 3463 3464 3465 3466 3467
	/*
	 * 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;

3468
	if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3469
			   &journal_devnum, &journal_ioprio, 0)) {
3470 3471 3472 3473
		ext4_msg(sb, KERN_WARNING,
			 "failed to parse options in superblock: %s",
			 sbi->s_es->s_mount_opts);
	}
3474
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3475
	if (!parse_options((char *) data, sb, &journal_devnum,
3476
			   &journal_ioprio, 0))
3477 3478
		goto failed_mount;

3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496
	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 "
				 "both data=journal and delalloc");
			goto failed_mount;
		}
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
	}

3497
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3498
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3499

3500 3501 3502 3503
	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)))
3504 3505 3506
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3507

3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529
	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;
		}
	}

3530 3531 3532 3533 3534
	/*
	 * 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.
	 */
3535
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3536
		goto failed_mount;
3537

J
Jan Kara 已提交
3538
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3539 3540
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3541 3542
		ext4_msg(sb, KERN_ERR,
		       "Unsupported filesystem blocksize %d", blocksize);
3543 3544 3545 3546
		goto failed_mount;
	}

	if (sb->s_blocksize != blocksize) {
3547 3548
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3549
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3550
					blocksize);
3551 3552 3553
			goto failed_mount;
		}

3554
		brelse(bh);
3555 3556 3557
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
		bh = sb_bread(sb, logical_sb_block);
3558
		if (!bh) {
3559 3560
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3561 3562
			goto failed_mount;
		}
3563
		es = (struct ext4_super_block *)(bh->b_data + offset);
3564
		sbi->s_es = es;
3565
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3566 3567
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3568 3569 3570 3571
			goto failed_mount;
		}
	}

3572 3573
	has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
				EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3574 3575 3576
	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);
3577

3578 3579 3580
	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;
3581 3582 3583
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3584
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
V
Vignesh Babu 已提交
3585
		    (!is_power_of_2(sbi->s_inode_size)) ||
3586
		    (sbi->s_inode_size > blocksize)) {
3587 3588
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3589
			       sbi->s_inode_size);
3590 3591
			goto failed_mount;
		}
K
Kalpak Shah 已提交
3592 3593
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3594
	}
3595

3596 3597
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3598
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3599
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
V
vignesh babu 已提交
3600
		    !is_power_of_2(sbi->s_desc_size)) {
3601 3602
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3603 3604 3605 3606 3607
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3608

3609 3610
	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);
3611
	if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3612
		goto cantfind_ext4;
3613

3614
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3615
	if (sbi->s_inodes_per_block == 0)
3616
		goto cantfind_ext4;
3617 3618
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3619
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3620 3621
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3622 3623
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3624

3625 3626 3627 3628
	/* Do we have standard group size of blocksize * 8 blocks ? */
	if (sbi->s_blocks_per_group == blocksize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3629
	for (i = 0; i < 4; i++)
3630 3631
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642
	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) {
#ifdef __CHAR_UNSIGNED__
		es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
		sbi->s_hash_unsigned = 3;
#else
		es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
#endif
	}
3643

3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687
	/* 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;
3688
	}
3689 3690
	sbi->s_cluster_ratio = clustersize / blocksize;

3691
	if (sbi->s_inodes_per_group > blocksize * 8) {
3692 3693
		ext4_msg(sb, KERN_ERR,
		       "#inodes per group too big: %lu",
3694
		       sbi->s_inodes_per_group);
3695 3696 3697
		goto failed_mount;
	}

3698 3699 3700 3701
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3702
	err = generic_check_addressable(sb->s_blocksize_bits,
3703
					ext4_blocks_count(es));
3704
	if (err) {
3705
		ext4_msg(sb, KERN_ERR, "filesystem"
3706
			 " too large to mount safely on this system");
3707
		if (sizeof(sector_t) < 8)
3708
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3709 3710 3711
		goto failed_mount;
	}

3712 3713
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3714

3715 3716 3717
	/* 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) {
3718 3719
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3720 3721 3722 3723
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3724 3725 3726 3727 3728
	/*
	 * 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)) {
3729
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3730 3731 3732
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3733 3734
		goto failed_mount;
	}
L
Laurent Vivier 已提交
3735 3736 3737 3738
	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));
3739
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3740
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3741
		       "(block count %llu, first data block %u, "
3742
		       "blocks per group %lu)", sbi->s_groups_count,
3743 3744 3745 3746 3747
		       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
3748
	sbi->s_groups_count = blocks_count;
3749 3750
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3751 3752
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3753 3754 3755
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3756
	if (sbi->s_group_desc == NULL) {
3757
		ext4_msg(sb, KERN_ERR, "not enough memory");
3758
		ret = -ENOMEM;
3759 3760 3761
		goto failed_mount;
	}

3762 3763
	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3764

3765 3766 3767 3768
	if (sbi->s_proc)
		proc_create_data("options", S_IRUGO, sbi->s_proc,
				 &ext4_seq_options_fops, sb);

3769
	bgl_lock_init(sbi->s_blockgroup_lock);
3770 3771

	for (i = 0; i < db_count; i++) {
3772
		block = descriptor_loc(sb, logical_sb_block, i);
3773 3774
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
3775 3776
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3777 3778 3779 3780
			db_count = i;
			goto failed_mount2;
		}
	}
3781
	if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3782
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3783 3784
		goto failed_mount2;
	}
3785 3786
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
		if (!ext4_fill_flex_info(sb)) {
3787 3788 3789
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
3790 3791 3792
			goto failed_mount2;
		}

3793 3794 3795 3796
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3797 3798 3799 3800
	init_timer(&sbi->s_err_report);
	sbi->s_err_report.function = print_daily_error_info;
	sbi->s_err_report.data = (unsigned long) sb;

3801 3802 3803
	/* Register extent status tree shrinker */
	ext4_es_register_shrinker(sb);

3804
	err = percpu_counter_init(&sbi->s_freeclusters_counter,
3805
			ext4_count_free_clusters(sb));
3806 3807 3808 3809 3810 3811 3812 3813 3814
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext4_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext4_count_dirs(sb));
	}
	if (!err) {
3815
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3816
	}
3817 3818 3819
	if (!err) {
		err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
	}
3820 3821 3822 3823 3824
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount3;
	}

3825
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3826
	sbi->s_extent_max_zeroout_kb = 32;
3827

3828 3829 3830
	/*
	 * set up enough so that it can read an inode
	 */
3831 3832 3833 3834 3835
	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;
3836 3837
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3838
#ifdef CONFIG_QUOTA
3839
	sb->dq_op = &ext4_quota_operations;
3840
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3841
		sb->s_qcop = &ext4_qctl_sysfile_operations;
3842 3843
	else
		sb->s_qcop = &ext4_qctl_operations;
3844
#endif
3845 3846
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3847
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3848
	mutex_init(&sbi->s_orphan_lock);
3849 3850 3851 3852

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3853 3854
			  EXT4_HAS_INCOMPAT_FEATURE(sb,
				    EXT4_FEATURE_INCOMPAT_RECOVER));
3855

3856 3857 3858 3859 3860
	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;

3861 3862 3863 3864 3865
	/*
	 * 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) &&
3866 3867
	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		if (ext4_load_journal(sb, es, journal_devnum))
3868
			goto failed_mount3;
3869 3870
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3871 3872
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3873
		goto failed_mount_wq;
3874
	} else {
3875
		clear_opt(sb, DATA_FLAGS);
3876 3877 3878
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3879 3880
	}

3881
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3882 3883
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3884
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3885
		goto failed_mount_wq;
3886 3887
	}

3888 3889 3890 3891
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3892
	}
3893

3894 3895 3896 3897 3898
	/* 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
3899 3900 3901
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3902 3903
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3904
			set_opt(sb, ORDERED_DATA);
3905
		else
3906
			set_opt(sb, JOURNAL_DATA);
3907 3908
		break;

3909 3910
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3911 3912
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3913 3914
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3915
			goto failed_mount_wq;
3916 3917 3918 3919
		}
	default:
		break;
	}
3920
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3921

B
Bobi Jam 已提交
3922 3923
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3924 3925 3926 3927
	/*
	 * The journal may have updated the bg summary counts, so we
	 * need to update the global counters.
	 */
3928
	percpu_counter_set(&sbi->s_freeclusters_counter,
3929
			   ext4_count_free_clusters(sb));
3930 3931 3932 3933
	percpu_counter_set(&sbi->s_freeinodes_counter,
			   ext4_count_free_inodes(sb));
	percpu_counter_set(&sbi->s_dirs_counter,
			   ext4_count_dirs(sb));
3934
	percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3935

3936
no_journal:
3937 3938 3939 3940 3941 3942 3943
	/*
	 * 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 {
3944 3945
		err = ext4_calculate_overhead(sb);
		if (err)
3946 3947 3948
			goto failed_mount_wq;
	}

T
Tejun Heo 已提交
3949 3950 3951 3952
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3953 3954 3955 3956
	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");
3957
		ret = -ENOMEM;
3958 3959 3960 3961 3962 3963 3964 3965 3966
		goto failed_mount4;
	}

	EXT4_SB(sb)->unrsv_conversion_wq =
		alloc_workqueue("ext4-unrsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
	if (!EXT4_SB(sb)->unrsv_conversion_wq) {
		printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
		ret = -ENOMEM;
		goto failed_mount4;
3967 3968
	}

3969
	/*
3970
	 * The jbd2_journal_load will have done any necessary log recovery,
3971 3972 3973
	 * so we can safely mount the rest of the filesystem now.
	 */

3974 3975
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3976
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3977
		ret = PTR_ERR(root);
3978
		root = NULL;
3979 3980 3981
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3982
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
A
Al Viro 已提交
3983
		iput(root);
3984 3985
		goto failed_mount4;
	}
3986
	sb->s_root = d_make_root(root);
3987
	if (!sb->s_root) {
3988
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3989 3990 3991
		ret = -ENOMEM;
		goto failed_mount4;
	}
3992

3993 3994
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
K
Kalpak Shah 已提交
3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016

	/* 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;
4017 4018
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
K
Kalpak Shah 已提交
4019 4020
	}

L
Lukas Czerner 已提交
4021 4022 4023 4024 4025 4026 4027
	err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sbi));
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
			 "reserved pool", ext4_calculate_resv_clusters(sbi));
		goto failed_mount4a;
	}

4028 4029
	err = ext4_setup_system_zone(sb);
	if (err) {
4030
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
4031
			 "zone (%d)", err);
A
Al Viro 已提交
4032
		goto failed_mount4a;
4033 4034
	}

4035
	ext4_ext_init(sb);
4036
	err = ext4_mb_init(sb);
4037
	if (err) {
4038
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4039
			 err);
4040
		goto failed_mount5;
4041 4042
	}

4043 4044
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4045
		goto failed_mount6;
4046

T
Theodore Ts'o 已提交
4047 4048 4049 4050
	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);
4051 4052
	if (err)
		goto failed_mount7;
T
Theodore Ts'o 已提交
4053

4054 4055 4056 4057 4058 4059 4060 4061 4062 4063
#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 */

4064 4065 4066
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4067
	if (needs_recovery) {
4068
		ext4_msg(sb, KERN_INFO, "recovery complete");
4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080
		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";

4081 4082 4083 4084 4085 4086 4087 4088
	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");
	}

4089
	ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4090 4091
		 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
		 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4092

4093 4094
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4095

4096
	kfree(orig_data);
4097 4098
	return 0;

4099
cantfind_ext4:
4100
	if (!silent)
4101
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4102 4103
	goto failed_mount;

4104 4105 4106 4107
#ifdef CONFIG_QUOTA
failed_mount8:
	kobject_del(&sbi->s_kobj);
#endif
4108 4109 4110 4111
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
	ext4_mb_release(sb);
A
Al Viro 已提交
4112 4113
failed_mount5:
	ext4_ext_release(sb);
4114
	ext4_release_system_zone(sb);
A
Al Viro 已提交
4115 4116
failed_mount4a:
	dput(sb->s_root);
4117
	sb->s_root = NULL;
A
Al Viro 已提交
4118
failed_mount4:
4119
	ext4_msg(sb, KERN_ERR, "mount failed");
4120 4121 4122 4123
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
	if (EXT4_SB(sb)->unrsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->unrsv_conversion_wq);
4124
failed_mount_wq:
4125 4126 4127 4128
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4129
failed_mount3:
4130
	ext4_es_unregister_shrinker(sb);
4131
	del_timer(&sbi->s_err_report);
4132 4133
	if (sbi->s_flex_groups)
		ext4_kvfree(sbi->s_flex_groups);
4134
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
4135 4136
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
4137
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4138
	percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4139 4140
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4141 4142 4143
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
4144
	ext4_kvfree(sbi->s_group_desc);
4145
failed_mount:
4146 4147
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4148
	if (sbi->s_proc) {
4149
		remove_proc_entry("options", sbi->s_proc);
4150
		remove_proc_entry(sb->s_id, ext4_proc_root);
4151
	}
4152 4153 4154 4155
#ifdef CONFIG_QUOTA
	for (i = 0; i < MAXQUOTAS; i++)
		kfree(sbi->s_qf_names[i]);
#endif
4156
	ext4_blkdev_remove(sbi);
4157 4158 4159
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4160
	kfree(sbi->s_blockgroup_lock);
4161
	kfree(sbi);
4162
out_free_orig:
4163
	kfree(orig_data);
4164
	return err ? err : ret;
4165 4166 4167 4168 4169 4170 4171
}

/*
 * 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.
 */
4172
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4173
{
4174
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4175

4176 4177 4178
	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;
4179

4180
	write_lock(&journal->j_state_lock);
4181
	if (test_opt(sb, BARRIER))
4182
		journal->j_flags |= JBD2_BARRIER;
4183
	else
4184
		journal->j_flags &= ~JBD2_BARRIER;
4185 4186 4187 4188
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4189
	write_unlock(&journal->j_state_lock);
4190 4191
}

4192
static journal_t *ext4_get_journal(struct super_block *sb,
4193 4194 4195 4196 4197
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4198 4199
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4200 4201 4202 4203
	/* 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. */

4204 4205
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4206
		ext4_msg(sb, KERN_ERR, "no journal found");
4207 4208 4209 4210 4211
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4212
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4213 4214 4215
		return NULL;
	}

4216
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4217
		  journal_inode, journal_inode->i_size);
4218
	if (!S_ISREG(journal_inode->i_mode)) {
4219
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4220 4221 4222 4223
		iput(journal_inode);
		return NULL;
	}

4224
	journal = jbd2_journal_init_inode(journal_inode);
4225
	if (!journal) {
4226
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4227 4228 4229 4230
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4231
	ext4_init_journal_params(sb, journal);
4232 4233 4234
	return journal;
}

4235
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4236 4237
				       dev_t j_dev)
{
4238
	struct buffer_head *bh;
4239
	journal_t *journal;
4240 4241
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4242
	int hblock, blocksize;
4243
	ext4_fsblk_t sb_block;
4244
	unsigned long offset;
4245
	struct ext4_super_block *es;
4246 4247
	struct block_device *bdev;

4248 4249
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4250
	bdev = ext4_blkdev_get(j_dev, sb);
4251 4252 4253 4254
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4255
	hblock = bdev_logical_block_size(bdev);
4256
	if (blocksize < hblock) {
4257 4258
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4259 4260 4261
		goto out_bdev;
	}

4262 4263
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4264 4265
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4266 4267
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4268 4269 4270
		goto out_bdev;
	}

4271
	es = (struct ext4_super_block *) (bh->b_data + offset);
4272
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4273
	    !(le32_to_cpu(es->s_feature_incompat) &
4274
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4275 4276
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4277 4278 4279 4280
		brelse(bh);
		goto out_bdev;
	}

4281
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4282
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4283 4284 4285 4286
		brelse(bh);
		goto out_bdev;
	}

L
Laurent Vivier 已提交
4287
	len = ext4_blocks_count(es);
4288 4289 4290
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4291
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4292 4293
					start, len, blocksize);
	if (!journal) {
4294
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4295 4296 4297
		goto out_bdev;
	}
	journal->j_private = sb;
4298
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4299 4300
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4301
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4302 4303 4304
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4305 4306
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4307 4308 4309
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4310 4311
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4312
	return journal;
4313

4314
out_journal:
4315
	jbd2_journal_destroy(journal);
4316
out_bdev:
4317
	ext4_blkdev_put(bdev);
4318 4319 4320
	return NULL;
}

4321 4322
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4323 4324 4325 4326 4327 4328 4329 4330
			     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;

4331 4332
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4333 4334
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4335 4336
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347
		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.
	 */
4348
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4349
		if (sb->s_flags & MS_RDONLY) {
4350 4351
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4352
			if (really_read_only) {
4353 4354
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4355 4356
				return -EROFS;
			}
4357 4358
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4359 4360 4361 4362
		}
	}

	if (journal_inum && journal_dev) {
4363 4364
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4365 4366 4367 4368
		return -EINVAL;
	}

	if (journal_inum) {
4369
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4370 4371
			return -EINVAL;
	} else {
4372
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4373 4374 4375
			return -EINVAL;
	}

4376
	if (!(journal->j_flags & JBD2_BARRIER))
4377
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4378

4379
	if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4380
		err = jbd2_journal_wipe(journal, !really_read_only);
4381 4382 4383 4384 4385
	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);
4386
		err = jbd2_journal_load(journal);
4387 4388 4389 4390 4391
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4392 4393

	if (err) {
4394
		ext4_msg(sb, KERN_ERR, "error loading journal");
4395
		jbd2_journal_destroy(journal);
4396 4397 4398
		return err;
	}

4399 4400
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4401

4402
	if (!really_read_only && journal_devnum &&
4403 4404 4405 4406
	    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. */
4407
		ext4_commit_super(sb, 1);
4408 4409 4410 4411 4412
	}

	return 0;
}

4413
static int ext4_commit_super(struct super_block *sb, int sync)
4414
{
4415
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4416
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4417
	int error = 0;
4418

4419
	if (!sbh || block_device_ejected(sb))
4420
		return error;
4421 4422 4423 4424 4425 4426 4427 4428 4429
	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.
		 */
4430 4431
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4432 4433 4434
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446
	/*
	 * 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());
4447 4448 4449
	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
4450 4451
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4452 4453 4454
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4455 4456 4457
	ext4_free_blocks_count_set(es,
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4458 4459 4460
	es->s_free_inodes_count =
		cpu_to_le32(percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeinodes_counter));
4461
	BUFFER_TRACE(sbh, "marking dirty");
4462
	ext4_superblock_csum_set(sb);
4463
	mark_buffer_dirty(sbh);
4464
	if (sync) {
4465 4466 4467 4468 4469 4470
		error = sync_dirty_buffer(sbh);
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4471 4472
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4473 4474 4475 4476
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4477
	return error;
4478 4479 4480 4481 4482 4483 4484
}

/*
 * 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.
 */
4485 4486
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4487
{
4488
	journal_t *journal = EXT4_SB(sb)->s_journal;
4489

4490 4491 4492 4493
	if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
		BUG_ON(journal != NULL);
		return;
	}
4494
	jbd2_journal_lock_updates(journal);
4495 4496 4497
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4498
	if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4499
	    sb->s_flags & MS_RDONLY) {
4500
		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4501
		ext4_commit_super(sb, 1);
4502
	}
4503 4504

out:
4505
	jbd2_journal_unlock_updates(journal);
4506 4507 4508 4509 4510 4511 4512
}

/*
 * 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.
 */
4513 4514
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4515 4516 4517 4518 4519
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4520 4521
	BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));

4522
	journal = EXT4_SB(sb)->s_journal;
4523 4524 4525

	/*
	 * Now check for any error status which may have been recorded in the
4526
	 * journal by a prior ext4_error() or ext4_abort()
4527 4528
	 */

4529
	j_errno = jbd2_journal_errno(journal);
4530 4531 4532
	if (j_errno) {
		char nbuf[16];

4533
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4534
		ext4_warning(sb, "Filesystem error recorded "
4535
			     "from previous mount: %s", errstr);
4536
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4537

4538 4539
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4540
		ext4_commit_super(sb, 1);
4541

4542
		jbd2_journal_clear_err(journal);
4543
		jbd2_journal_update_sb_errno(journal);
4544 4545 4546 4547 4548 4549 4550
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4551
int ext4_force_commit(struct super_block *sb)
4552 4553 4554 4555 4556 4557
{
	journal_t *journal;

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

4558
	journal = EXT4_SB(sb)->s_journal;
4559
	return ext4_journal_force_commit(journal);
4560 4561
}

4562
static int ext4_sync_fs(struct super_block *sb, int wait)
4563
{
4564
	int ret = 0;
4565
	tid_t target;
4566
	bool needs_barrier = false;
4567
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4568

4569
	trace_ext4_sync_fs(sb, wait);
4570 4571
	flush_workqueue(sbi->rsv_conversion_wq);
	flush_workqueue(sbi->unrsv_conversion_wq);
4572 4573 4574 4575 4576
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4577 4578 4579 4580 4581 4582 4583 4584 4585 4586
	/*
	 * 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;

4587
	if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4588
		if (wait)
4589 4590 4591 4592 4593 4594 4595
			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;
4596
	}
4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611

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

4612
	return ret;
4613 4614 4615 4616 4617
}

/*
 * 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.
4618 4619
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4620 4621
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4622
 */
4623
static int ext4_freeze(struct super_block *sb)
4624
{
4625 4626
	int error = 0;
	journal_t *journal;
4627

4628 4629
	if (sb->s_flags & MS_RDONLY)
		return 0;
4630

4631
	journal = EXT4_SB(sb)->s_journal;
4632

4633 4634
	/* Now we set up the journal barrier. */
	jbd2_journal_lock_updates(journal);
4635

4636 4637 4638 4639 4640
	/*
	 * Don't clear the needs_recovery flag if we failed to flush
	 * the journal.
	 */
	error = jbd2_journal_flush(journal);
4641 4642
	if (error < 0)
		goto out;
4643 4644 4645 4646

	/* Journal blocked and flushed, clear needs_recovery flag. */
	EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
	error = ext4_commit_super(sb, 1);
4647
out:
4648
	/* we rely on upper layer to stop further updates */
4649 4650
	jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
	return error;
4651 4652 4653 4654 4655 4656
}

/*
 * 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.
 */
4657
static int ext4_unfreeze(struct super_block *sb)
4658
{
4659 4660 4661 4662 4663 4664
	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);
4665
	return 0;
4666 4667
}

4668 4669 4670 4671 4672
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4673
	unsigned long s_mount_opt2;
4674 4675
	kuid_t s_resuid;
	kgid_t s_resgid;
4676 4677 4678 4679 4680 4681 4682 4683
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
	char *s_qf_names[MAXQUOTAS];
#endif
};

4684
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4685
{
4686
	struct ext4_super_block *es;
4687
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4688
	unsigned long old_sb_flags;
4689
	struct ext4_mount_options old_opts;
4690
	int enable_quota = 0;
4691
	ext4_group_t g;
4692
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4693
	int err = 0;
4694
#ifdef CONFIG_QUOTA
4695
	int i, j;
4696
#endif
4697
	char *orig_data = kstrdup(data, GFP_KERNEL);
4698 4699 4700 4701

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4702
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4703 4704 4705
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4706 4707
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4708 4709 4710
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++)
4711 4712 4713 4714 4715 4716
		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]);
4717
				kfree(orig_data);
4718 4719 4720 4721
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4722
#endif
4723 4724
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4725 4726 4727 4728

	/*
	 * Allow the "check" option to be passed as a remount option.
	 */
4729
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4730 4731 4732 4733
		err = -EINVAL;
		goto restore_opts;
	}

4734
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4735
		ext4_abort(sb, "Abort forced by user");
4736 4737

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4738
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4739 4740 4741

	es = sbi->s_es;

4742
	if (sbi->s_journal) {
4743
		ext4_init_journal_params(sb, sbi->s_journal);
4744 4745
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4746

4747
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4748
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4749 4750 4751 4752 4753
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4754 4755
			err = dquot_suspend(sb, -1);
			if (err < 0)
4756 4757
				goto restore_opts;

4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
			/*
			 * 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.
			 */
4769 4770
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4771 4772
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4773
			if (sbi->s_journal)
4774
				ext4_mark_recovery_complete(sb, es);
4775
		} else {
4776 4777
			/* Make sure we can mount this feature set readwrite */
			if (!ext4_feature_set_ok(sb, 0)) {
4778 4779 4780
				err = -EROFS;
				goto restore_opts;
			}
4781 4782
			/*
			 * Make sure the group descriptor checksums
4783
			 * are sane.  If they aren't, refuse to remount r/w.
4784 4785 4786 4787 4788
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4789
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4790 4791
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4792 4793 4794 4795 4796 4797 4798
		g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
					       le16_to_cpu(gdp->bg_checksum));
					err = -EINVAL;
					goto restore_opts;
				}
			}

4799 4800 4801 4802 4803 4804
			/*
			 * 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) {
4805
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4806 4807
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4808
				       "umount/remount instead");
4809 4810 4811 4812
				err = -EINVAL;
				goto restore_opts;
			}

4813 4814 4815 4816 4817 4818
			/*
			 * 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.)
			 */
4819 4820
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4821
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4822
			if (!ext4_setup_super(sb, es, 0))
4823
				sb->s_flags &= ~MS_RDONLY;
4824 4825 4826 4827 4828 4829 4830
			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;
				}
4831
			enable_quota = 1;
4832 4833
		}
	}
4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846

	/*
	 * 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);
	}

4847
	ext4_setup_system_zone(sb);
4848
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4849
		ext4_commit_super(sb, 1);
4850

4851 4852 4853
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
	for (i = 0; i < MAXQUOTAS; i++)
4854
		kfree(old_opts.s_qf_names[i]);
4855 4856 4857 4858 4859 4860
	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);
4861
			if (err)
4862 4863 4864
				goto restore_opts;
		}
	}
4865
#endif
4866 4867 4868

	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4869
	return 0;
4870

4871 4872 4873
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4874
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4875 4876 4877
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4878 4879
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4880 4881 4882
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
	for (i = 0; i < MAXQUOTAS; i++) {
4883
		kfree(sbi->s_qf_names[i]);
4884 4885 4886
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4887
	kfree(orig_data);
4888 4889 4890
	return err;
}

4891
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4892 4893
{
	struct super_block *sb = dentry->d_sb;
4894 4895
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
L
Lukas Czerner 已提交
4896
	ext4_fsblk_t overhead = 0, resv_blocks;
P
Pekka Enberg 已提交
4897
	u64 fsid;
4898
	s64 bfree;
L
Lukas Czerner 已提交
4899
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4900

4901 4902
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4903

4904
	buf->f_type = EXT4_SUPER_MAGIC;
4905
	buf->f_bsize = sb->s_blocksize;
4906
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4907 4908
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4909
	/* prevent underflow in case that few free space is available */
4910
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
L
Lukas Czerner 已提交
4911 4912 4913
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4914 4915
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
P
Peter Zijlstra 已提交
4916
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4917
	buf->f_namelen = EXT4_NAME_LEN;
P
Pekka Enberg 已提交
4918 4919 4920 4921
	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;
4922

4923 4924 4925
	return 0;
}

4926 4927
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4928
 * Process 1                         Process 2
4929
 * ext4_create()                     quota_sync()
4930
 *   jbd2_journal_start()                  write_dquot()
4931
 *   dquot_initialize()                         down(dqio_mutex)
4932
 *     down(dqio_mutex)                    jbd2_journal_start()
4933 4934 4935 4936 4937 4938 4939
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4940
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4941 4942
}

4943
static int ext4_write_dquot(struct dquot *dquot)
4944 4945 4946 4947 4948 4949
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4950
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4951
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4952 4953 4954
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4955
	err = ext4_journal_stop(handle);
4956 4957 4958 4959 4960
	if (!ret)
		ret = err;
	return ret;
}

4961
static int ext4_acquire_dquot(struct dquot *dquot)
4962 4963 4964 4965
{
	int ret, err;
	handle_t *handle;

4966
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4967
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4968 4969 4970
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4971
	err = ext4_journal_stop(handle);
4972 4973 4974 4975 4976
	if (!ret)
		ret = err;
	return ret;
}

4977
static int ext4_release_dquot(struct dquot *dquot)
4978 4979 4980 4981
{
	int ret, err;
	handle_t *handle;

4982
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4983
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
J
Jan Kara 已提交
4984 4985 4986
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4987
		return PTR_ERR(handle);
J
Jan Kara 已提交
4988
	}
4989
	ret = dquot_release(dquot);
4990
	err = ext4_journal_stop(handle);
4991 4992 4993 4994 4995
	if (!ret)
		ret = err;
	return ret;
}

4996
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4997
{
4998 4999 5000
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5001
	/* Are we journaling quotas? */
5002 5003
	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5004
		dquot_mark_dquot_dirty(dquot);
5005
		return ext4_write_dquot(dquot);
5006 5007 5008 5009 5010
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5011
static int ext4_write_info(struct super_block *sb, int type)
5012 5013 5014 5015 5016
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5017
	handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5018 5019 5020
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5021
	err = ext4_journal_stop(handle);
5022 5023 5024 5025 5026 5027 5028 5029 5030
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5031
static int ext4_quota_on_mount(struct super_block *sb, int type)
5032
{
5033 5034
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5035 5036 5037 5038 5039
}

/*
 * Standard function to be called on quota_on
 */
5040
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5041
			 struct path *path)
5042 5043 5044 5045 5046
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5047

5048
	/* Quotafile not on the same filesystem? */
5049
	if (path->dentry->d_sb != sb)
5050
		return -EXDEV;
5051 5052
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5053
		/* Quotafile not in fs root? */
5054
		if (path->dentry->d_parent != sb->s_root)
5055 5056 5057
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5058
	}
5059 5060 5061 5062 5063

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5064
	if (EXT4_SB(sb)->s_journal &&
5065
	    ext4_should_journal_data(path->dentry->d_inode)) {
5066 5067 5068 5069 5070
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5071
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5072
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5073
		if (err)
5074
			return err;
5075 5076
	}

5077
	return dquot_quota_on(sb, type, format_id, path);
5078 5079
}

5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));

	if (!qf_inums[type])
		return -EPERM;

	qf_inode = ext4_iget(sb, qf_inums[type]);
	if (IS_ERR(qf_inode)) {
		ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
		return PTR_ERR(qf_inode);
	}

J
Jan Kara 已提交
5101 5102
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
	unsigned long qf_inums[MAXQUOTAS] = {
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
	for (type = 0; type < MAXQUOTAS; type++) {
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
				ext4_warning(sb,
5125 5126 5127
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149
				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);
}

5150 5151
static int ext4_quota_off(struct super_block *sb, int type)
{
5152 5153 5154
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5155 5156 5157
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5158 5159
		sync_filesystem(sb);

5160 5161 5162
	if (!inode)
		goto out;

5163 5164
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5165
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5166 5167 5168 5169 5170 5171 5172
	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:
5173 5174 5175
	return dquot_quota_off(sb, type);
}

5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187
/*
 * 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);
}

5188 5189
/* 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
5190
 * itself serializes the operations (and no one else should touch the files)
5191
 * we don't have to be afraid of races */
5192
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5193 5194 5195
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
A
Aneesh Kumar K.V 已提交
5196
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	struct buffer_head *bh;
	loff_t i_size = i_size_read(inode);

	if (off > i_size)
		return 0;
	if (off+len > i_size)
		len = i_size-off;
	toread = len;
	while (toread > 0) {
		tocopy = sb->s_blocksize - offset < toread ?
				sb->s_blocksize - offset : toread;
5212
		bh = ext4_bread(NULL, inode, blk, 0, &err);
5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229
		if (err)
			return err;
		if (!bh)	/* A hole? */
			memset(data, 0, tocopy);
		else
			memcpy(data, bh->b_data+offset, tocopy);
		brelse(bh);
		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blk++;
	}
	return len;
}

/* Write to quotafile (we know the transaction is already started and has
 * enough credits) */
5230
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5231 5232 5233
				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
5234
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5235 5236 5237 5238 5239
	int err = 0;
	int offset = off & (sb->s_blocksize - 1);
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5240
	if (EXT4_SB(sb)->s_journal && !handle) {
5241 5242
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
J
Jan Kara 已提交
5243 5244 5245
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259
	/*
	 * Since we account only one data block in transaction credits,
	 * then it is impossible to cross a block boundary.
	 */
	if (sb->s_blocksize - offset < len) {
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because not block aligned",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}

	bh = ext4_bread(handle, inode, blk, 1, &err);
	if (!bh)
		goto out;
5260 5261 5262 5263
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
		goto out;
5264
	}
5265 5266 5267 5268
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5269
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5270
	brelse(bh);
5271
out:
5272
	if (err)
5273
		return err;
5274 5275
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5276
		EXT4_I(inode)->i_disksize = inode->i_size;
5277
		ext4_mark_inode_dirty(handle, inode);
5278
	}
5279
	return len;
5280 5281 5282 5283
}

#endif

A
Al Viro 已提交
5284 5285
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5286
{
A
Al Viro 已提交
5287
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5288 5289
}

5290
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302
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);
}
5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313

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;
}
5314 5315 5316
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5317
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5318 5319
#endif

5320
#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
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);
}
5333 5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345

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;
}
5346 5347 5348
#else
static inline void register_as_ext3(void) { }
static inline void unregister_as_ext3(void) { }
5349
static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5350 5351
#endif

T
Theodore Ts'o 已提交
5352 5353 5354
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
A
Al Viro 已提交
5355
	.mount		= ext4_mount,
T
Theodore Ts'o 已提交
5356 5357 5358
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5359
MODULE_ALIAS_FS("ext4");
T
Theodore Ts'o 已提交
5360

5361
static int __init ext4_init_feat_adverts(void)
5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382 5383 5384
{
	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;
}

5385 5386 5387 5388 5389 5390 5391
static void ext4_exit_feat_adverts(void)
{
	kobject_put(&ext4_feat->f_kobj);
	wait_for_completion(&ext4_feat->f_kobj_unregister);
	kfree(ext4_feat);
}

5392 5393 5394 5395
/* 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];

5396
static int __init ext4_init_fs(void)
5397
{
5398
	int i, err;
5399

5400 5401 5402
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5403
	/* Build-time check for flags consistency */
5404
	ext4_check_flag_values();
5405 5406 5407 5408 5409 5410

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

5411
	err = ext4_init_es();
5412 5413
	if (err)
		return err;
5414 5415 5416 5417 5418

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

5419
	err = ext4_init_system_zone();
5420
	if (err)
5421
		goto out6;
T
Theodore Ts'o 已提交
5422
	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5423 5424
	if (!ext4_kset) {
		err = -ENOMEM;
T
Theodore Ts'o 已提交
5425
		goto out5;
5426
	}
5427
	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5428 5429

	err = ext4_init_feat_adverts();
T
Theodore Ts'o 已提交
5430 5431
	if (err)
		goto out4;
5432

5433
	err = ext4_init_mballoc();
5434
	if (err)
5435
		goto out3;
5436

5437
	err = ext4_init_xattr();
5438 5439
	if (err)
		goto out2;
5440 5441 5442
	err = init_inodecache();
	if (err)
		goto out1;
5443
	register_as_ext3();
5444
	register_as_ext2();
T
Theodore Ts'o 已提交
5445
	err = register_filesystem(&ext4_fs_type);
5446 5447
	if (err)
		goto out;
5448

5449 5450
	return 0;
out:
5451 5452
	unregister_as_ext2();
	unregister_as_ext3();
5453 5454
	destroy_inodecache();
out1:
5455
	ext4_exit_xattr();
5456
out2:
5457
	ext4_exit_mballoc();
5458
out3:
5459
	ext4_exit_feat_adverts();
T
Theodore Ts'o 已提交
5460
out4:
5461 5462
	if (ext4_proc_root)
		remove_proc_entry("fs/ext4", NULL);
5463
	kset_unregister(ext4_kset);
5464
out5:
5465
	ext4_exit_system_zone();
5466
out6:
5467
	ext4_exit_pageio();
5468 5469 5470
out7:
	ext4_exit_es();

5471 5472 5473
	return err;
}

5474
static void __exit ext4_exit_fs(void)
5475
{
5476
	ext4_destroy_lazyinit_thread();
5477 5478
	unregister_as_ext2();
	unregister_as_ext3();
T
Theodore Ts'o 已提交
5479
	unregister_filesystem(&ext4_fs_type);
5480
	destroy_inodecache();
5481 5482
	ext4_exit_xattr();
	ext4_exit_mballoc();
5483
	ext4_exit_feat_adverts();
5484
	remove_proc_entry("fs/ext4", NULL);
T
Theodore Ts'o 已提交
5485
	kset_unregister(ext4_kset);
5486 5487
	ext4_exit_system_zone();
	ext4_exit_pageio();
5488 5489 5490
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5491
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5492
MODULE_LICENSE("GPL");
5493 5494
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)