示例#1
0
文件: file.c 项目: v-b-n/XCeLL-V69-2
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
		unsigned long nr_segs, loff_t pos)
{
	struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;

	/*
	 * If we have encountered a bitmap-format file, the size limit
	 * is smaller than s_maxbytes, which is for extent-mapped files.
	 */

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
		size_t length = iov_length(iov, nr_segs);

		if (pos > sbi->s_bitmap_maxbytes)
			return -EFBIG;

		if (pos + length > sbi->s_bitmap_maxbytes) {
			nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
					      sbi->s_bitmap_maxbytes - pos);
		}
	}

	return generic_file_aio_write(iocb, iov, nr_segs, pos);
}
示例#2
0
/*
 * ext4_llseek() copied from generic_file_llseek() to handle both
 * block-mapped and extent-mapped maxbytes values. This should
 * otherwise be identical with generic_file_llseek().
 */
loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes;

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
	else
		maxbytes = inode->i_sb->s_maxbytes;
	mutex_lock(&inode->i_mutex);
	switch (origin) {
	case SEEK_END:
		offset += inode->i_size;
		break;
	case SEEK_CUR:
		if (offset == 0) {
			mutex_unlock(&inode->i_mutex);
			return file->f_pos;
		}
		offset += file->f_pos;
		break;
	case SEEK_DATA:
		/*
		 * In the generic case the entire file is data, so as long as
		 * offset isn't at the end of the file then the offset is data.
		 */
		if (offset >= inode->i_size) {
			mutex_unlock(&inode->i_mutex);
			return -ENXIO;
		}
		break;
	case SEEK_HOLE:
		/*
		 * There is a virtual hole at the end of the file, so as long as
		 * offset isn't i_size or larger, return i_size.
		 */
		if (offset >= inode->i_size) {
			mutex_unlock(&inode->i_mutex);
			return -ENXIO;
		}
		offset = inode->i_size;
		break;
	}

	if (offset < 0 || offset > maxbytes) {
		mutex_unlock(&inode->i_mutex);
		return -EINVAL;
	}

	if (offset != file->f_pos) {
		file->f_pos = offset;
		file->f_version = 0;
	}
	mutex_unlock(&inode->i_mutex);

	return offset;
}
示例#3
0
/*
 * Migrate a simple extent-based inode to use the i_blocks[] array
 */
int ext4_ind_migrate(struct inode *inode)
{
	struct ext4_extent_header	*eh;
	struct ext4_super_block		*es = EXT4_SB(inode->i_sb)->s_es;
	struct ext4_inode_info		*ei = EXT4_I(inode);
	struct ext4_extent		*ex;
	unsigned int			i, len;
	ext4_fsblk_t			blk;
	handle_t			*handle;
	int				ret;

	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return -EOPNOTSUPP;

	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	down_write(&EXT4_I(inode)->i_data_sem);
	ret = ext4_ext_check_inode(inode);
	if (ret)
		goto errout;

	eh = ext_inode_hdr(inode);
	ex  = EXT_FIRST_EXTENT(eh);
	if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
	    eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
		ret = -EOPNOTSUPP;
		goto errout;
	}
	if (eh->eh_entries == 0)
		blk = len = 0;
	else {
		len = le16_to_cpu(ex->ee_len);
		blk = ext4_ext_pblock(ex);
		if (len > EXT4_NDIR_BLOCKS) {
			ret = -EOPNOTSUPP;
			goto errout;
		}
	}

	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
	memset(ei->i_data, 0, sizeof(ei->i_data));
	for (i=0; i < len; i++)
		ei->i_data[i] = cpu_to_le32(blk++);
	ext4_mark_inode_dirty(handle, inode);
errout:
	ext4_journal_stop(handle);
	up_write(&EXT4_I(inode)->i_data_sem);
	return ret;
}
示例#4
0
/*
 * ext4_llseek() copied from generic_file_llseek() to handle both
 * block-mapped and extent-mapped maxbytes values. This should
 * otherwise be identical with generic_file_llseek().
 */
loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes;

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
	else
		maxbytes = inode->i_sb->s_maxbytes;

	return generic_file_llseek_size(file, offset, origin, maxbytes);
}
示例#5
0
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
		unsigned long nr_segs, loff_t pos)
{
	struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
	int unaligned_aio = 0;
	int ret;

	trace_ext4_file_write(iocb->ki_filp->f_path.dentry, iocb->ki_left);
	/*
	 * If we have encountered a bitmap-format file, the size limit
	 * is smaller than s_maxbytes, which is for extent-mapped files.
	 */

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
		size_t length = iov_length(iov, nr_segs);

		if ((pos > sbi->s_bitmap_maxbytes ||
		    (pos == sbi->s_bitmap_maxbytes && length > 0)))
			return -EFBIG;

		if (pos + length > sbi->s_bitmap_maxbytes) {
			nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
					      sbi->s_bitmap_maxbytes - pos);
		}
	} else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) &&
		   !is_sync_kiocb(iocb))) {
		unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
	}

	/* Unaligned direct AIO must be serialized; see comment above */
	if (unaligned_aio) {
		static unsigned long unaligned_warn_time;

		/* Warn about this once per day */
		if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
			ext4_msg(inode->i_sb, KERN_WARNING,
				 "Unaligned AIO/DIO on inode %ld by %s; "
				 "performance will be poor.",
				 inode->i_ino, current->comm);
		mutex_lock(ext4_aio_mutex(inode));
		ext4_aiodio_wait(inode);
	}

	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);

	if (unaligned_aio)
		mutex_unlock(ext4_aio_mutex(inode));

	trace_file_write_done(iocb->ki_filp);
	return ret;
}
示例#6
0
static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
                unsigned long nr_segs, loff_t pos)
{
    struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
    int unaligned_aio = 0;
    int ret;

    trace_ext4_file_write(iocb->ki_filp->f_path.dentry, iocb->ki_left);

    if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
        struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
        size_t length = iov_length(iov, nr_segs);

        if ((pos > sbi->s_bitmap_maxbytes ||
                (pos == sbi->s_bitmap_maxbytes && length > 0)))
            return -EFBIG;

        if (pos + length > sbi->s_bitmap_maxbytes) {
            nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
                                  sbi->s_bitmap_maxbytes - pos);
        }
    } else if (unlikely((iocb->ki_filp->f_flags & O_DIRECT) &&
                        !is_sync_kiocb(iocb))) {
        unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
    }


    if (unaligned_aio) {
        static unsigned long unaligned_warn_time;


        if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
            ext4_msg(inode->i_sb, KERN_WARNING,
                     "Unaligned AIO/DIO on inode %ld by %s; "
                     "performance will be poor.",
                     inode->i_ino, current->comm);
        mutex_lock(ext4_aio_mutex(inode));
        ext4_aiodio_wait(inode);
    }

    ret = generic_file_aio_write(iocb, iov, nr_segs, pos);

    if (unaligned_aio)
        mutex_unlock(ext4_aio_mutex(inode));

    return ret;
}
示例#7
0
文件: ioctl.c 项目: Anjali05/linux
static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
{
	/*
	 * Project Quota ID state is only allowed to change from within the init
	 * namespace. Enforce that restriction only if we are trying to change
	 * the quota ID state. Everything else is allowed in user namespaces.
	 */
	if (current_user_ns() == &init_user_ns)
		return 0;

	if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
		return -EINVAL;

	if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
		if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
			return -EINVAL;
	} else {
		if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
			return -EINVAL;
	}

	return 0;
}
示例#8
0
/*
 * ext4_llseek() copied from generic_file_llseek() to handle both
 * block-mapped and extent-mapped maxbytes values. This should
 * otherwise be identical with generic_file_llseek().
 */
loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes;

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
	else
		maxbytes = inode->i_sb->s_maxbytes;
	mutex_lock(&inode->i_mutex);
	switch (origin) {
	case SEEK_END:
		offset += inode->i_size;
		break;
	case SEEK_CUR:
		if (offset == 0) {
			mutex_unlock(&inode->i_mutex);
			return file->f_pos;
		}
		offset += file->f_pos;
		break;
	}

	if (offset < 0 || offset > maxbytes) {
		mutex_unlock(&inode->i_mutex);
		return -EINVAL;
	}

	if (offset != file->f_pos) {
		file->f_pos = offset;
		file->f_version = 0;
	}
	mutex_unlock(&inode->i_mutex);

	return offset;
}
示例#9
0
/*
 * Migrate a simple extent-based inode to use the i_blocks[] array
 */
int ext4_ind_migrate(struct inode *inode)
{
	struct ext4_extent_header	*eh;
	struct ext4_super_block		*es = EXT4_SB(inode->i_sb)->s_es;
	struct ext4_inode_info		*ei = EXT4_I(inode);
	struct ext4_extent		*ex;
	unsigned int			i, len;
	ext4_lblk_t			start, end;
	ext4_fsblk_t			blk;
	handle_t			*handle;
	int				ret;

	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_RO_COMPAT_BIGALLOC))
		return -EOPNOTSUPP;

	/*
	 * In order to get correct extent info, force all delayed allocation
	 * blocks to be allocated, otherwise delayed allocation blocks may not
	 * be reflected and bypass the checks on extent header.
	 */
	if (test_opt(inode->i_sb, DELALLOC))
		ext4_alloc_da_blocks(inode);

	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
	if (IS_ERR(handle))
		return PTR_ERR(handle);

	down_write(&EXT4_I(inode)->i_data_sem);
	ret = ext4_ext_check_inode(inode);
	if (ret)
		goto errout;

	eh = ext_inode_hdr(inode);
	ex  = EXT_FIRST_EXTENT(eh);
	if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS ||
	    eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) {
		ret = -EOPNOTSUPP;
		goto errout;
	}
	if (eh->eh_entries == 0)
		blk = len = start = end = 0;
	else {
		len = le16_to_cpu(ex->ee_len);
		blk = ext4_ext_pblock(ex);
		start = le32_to_cpu(ex->ee_block);
		end = start + len - 1;
		if (end >= EXT4_NDIR_BLOCKS) {
			ret = -EOPNOTSUPP;
			goto errout;
		}
	}

	ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
	memset(ei->i_data, 0, sizeof(ei->i_data));
	for (i = start; i <= end; i++)
		ei->i_data[i] = cpu_to_le32(blk++);
	ext4_mark_inode_dirty(handle, inode);
errout:
	ext4_journal_stop(handle);
	up_write(&EXT4_I(inode)->i_data_sem);
	return ret;
}
示例#10
0
int ext4_ext_migrate(struct inode *inode)
{
	handle_t *handle;
	int retval = 0, i;
	__le32 *i_data;
	struct ext4_inode_info *ei;
	struct inode *tmp_inode = NULL;
	struct migrate_struct lb;
	unsigned long max_entries;
	__u32 goal;
	uid_t owner[2];

	/*
	 * If the filesystem does not support extents, or the inode
	 * already is extent-based, error out.
	 */
	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
		/*
		 * don't migrate fast symlink
		 */
		return retval;

	/*
	 * Worst case we can touch the allocation bitmaps, a bgd
	 * block, and a block to link in the orphan list.  We do need
	 * need to worry about credits for modifying the quota inode.
	 */
	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE,
		4 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb));

	if (IS_ERR(handle)) {
		retval = PTR_ERR(handle);
		return retval;
	}
	goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
		EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
	owner[0] = i_uid_read(inode);
	owner[1] = i_gid_read(inode);
	tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
				   S_IFREG, NULL, goal, owner);
	if (IS_ERR(tmp_inode)) {
		retval = PTR_ERR(tmp_inode);
		ext4_journal_stop(handle);
		return retval;
	}
	i_size_write(tmp_inode, i_size_read(inode));
	/*
	 * Set the i_nlink to zero so it will be deleted later
	 * when we drop inode reference.
	 */
	clear_nlink(tmp_inode);

	ext4_ext_tree_init(handle, tmp_inode);
	ext4_orphan_add(handle, tmp_inode);
	ext4_journal_stop(handle);

	/*
	 * start with one credit accounted for
	 * superblock modification.
	 *
	 * For the tmp_inode we already have committed the
	 * trascation that created the inode. Later as and
	 * when we add extents we extent the journal
	 */
	/*
	 * Even though we take i_mutex we can still cause block
	 * allocation via mmap write to holes. If we have allocated
	 * new blocks we fail migrate.  New block allocation will
	 * clear EXT4_STATE_EXT_MIGRATE flag.  The flag is updated
	 * with i_data_sem held to prevent racing with block
	 * allocation.
	 */
	down_read((&EXT4_I(inode)->i_data_sem));
	ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
	up_read((&EXT4_I(inode)->i_data_sem));

	handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
	if (IS_ERR(handle)) {
		/*
		 * It is impossible to update on-disk structures without
		 * a handle, so just rollback in-core changes and live other
		 * work to orphan_list_cleanup()
		 */
		ext4_orphan_del(NULL, tmp_inode);
		retval = PTR_ERR(handle);
		goto out;
	}

	ei = EXT4_I(inode);
	i_data = ei->i_data;
	memset(&lb, 0, sizeof(lb));

	/* 32 bit block address 4 bytes */
	max_entries = inode->i_sb->s_blocksize >> 2;
	for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
		if (i_data[i]) {
			retval = update_extent_range(handle, tmp_inode,
						le32_to_cpu(i_data[i]), &lb);
			if (retval)
				goto err_out;
		} else
			lb.curr_block++;
	}
	if (i_data[EXT4_IND_BLOCK]) {
		retval = update_ind_extent_range(handle, tmp_inode,
				le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
			if (retval)
				goto err_out;
	} else
		lb.curr_block += max_entries;
	if (i_data[EXT4_DIND_BLOCK]) {
		retval = update_dind_extent_range(handle, tmp_inode,
				le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
			if (retval)
				goto err_out;
	} else
		lb.curr_block += max_entries * max_entries;
	if (i_data[EXT4_TIND_BLOCK]) {
		retval = update_tind_extent_range(handle, tmp_inode,
				le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
			if (retval)
				goto err_out;
	}
	/*
	 * Build the last extent
	 */
	retval = finish_range(handle, tmp_inode, &lb);
err_out:
	if (retval)
		/*
		 * Failure case delete the extent information with the
		 * tmp_inode
		 */
		free_ext_block(handle, tmp_inode);
	else {
		retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
		if (retval)
			/*
			 * if we fail to swap inode data free the extent
			 * details of the tmp inode
			 */
			free_ext_block(handle, tmp_inode);
	}

	/* We mark the tmp_inode dirty via ext4_ext_tree_init. */
	if (ext4_journal_extend(handle, 1) != 0)
		ext4_journal_restart(handle, 1);

	/*
	 * Mark the tmp_inode as of size zero
	 */
	i_size_write(tmp_inode, 0);

	/*
	 * set the  i_blocks count to zero
	 * so that the ext4_delete_inode does the
	 * right job
	 *
	 * We don't need to take the i_lock because
	 * the inode is not visible to user space.
	 */
	tmp_inode->i_blocks = 0;

	/* Reset the extent details */
	ext4_ext_tree_init(handle, tmp_inode);
	ext4_journal_stop(handle);
out:
	unlock_new_inode(tmp_inode);
	iput(tmp_inode);

	return retval;
}
int ext4_has_inline_data(struct inode *inode)
{
	return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
	       EXT4_I(inode)->i_inline_off;
}
示例#12
0
static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
						struct inode *tmp_inode)
{
	int retval;
	__le32	i_data[3];
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);

	/*
	 * One credit accounted for writing the
	 * i_data field of the original inode
	 */
	retval = ext4_journal_extend(handle, 1);
	if (retval) {
		retval = ext4_journal_restart(handle, 1);
		if (retval)
			goto err_out;
	}

	i_data[0] = ei->i_data[EXT4_IND_BLOCK];
	i_data[1] = ei->i_data[EXT4_DIND_BLOCK];
	i_data[2] = ei->i_data[EXT4_TIND_BLOCK];

	down_write(&EXT4_I(inode)->i_data_sem);
	/*
	 * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
	 * happened after we started the migrate. We need to
	 * fail the migrate
	 */
	if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) {
		retval = -EAGAIN;
		up_write(&EXT4_I(inode)->i_data_sem);
		goto err_out;
	} else
		ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
	/*
	 * We have the extent map build with the tmp inode.
	 * Now copy the i_data across
	 */
	ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS);
	memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data));

	/*
	 * Update i_blocks with the new blocks that got
	 * allocated while adding extents for extent index
	 * blocks.
	 *
	 * While converting to extents we need not
	 * update the orignal inode i_blocks for extent blocks
	 * via quota APIs. The quota update happened via tmp_inode already.
	 */
	spin_lock(&inode->i_lock);
	inode->i_blocks += tmp_inode->i_blocks;
	spin_unlock(&inode->i_lock);
	up_write(&EXT4_I(inode)->i_data_sem);

	/*
	 * We mark the inode dirty after, because we decrement the
	 * i_blocks when freeing the indirect meta-data blocks
	 */
	retval = free_ind_block(handle, inode, i_data);
	ext4_mark_inode_dirty(handle, inode);

err_out:
	return retval;
}
示例#13
0
文件: migrate.c 项目: Addision/LVS
int ext4_ext_migrate(struct inode *inode)
{
	handle_t *handle;
	int retval = 0, i;
	__le32 *i_data;
	ext4_lblk_t blk_count = 0;
	struct ext4_inode_info *ei;
	struct inode *tmp_inode = NULL;
	struct list_blocks_struct lb;
	unsigned long max_entries;
	__u32 goal;

	/*
	 * If the filesystem does not support extents, or the inode
	 * already is extent-based, error out.
	 */
	if (!EXT4_HAS_INCOMPAT_FEATURE(inode->i_sb,
				       EXT4_FEATURE_INCOMPAT_EXTENTS) ||
	    (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		return -EINVAL;

	if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0)
		/*
		 * don't migrate fast symlink
		 */
		return retval;

	handle = ext4_journal_start(inode,
					EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
					EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
					EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
					+ 1);
	if (IS_ERR(handle)) {
		retval = PTR_ERR(handle);
		return retval;
	}
	goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
		EXT4_INODES_PER_GROUP(inode->i_sb)) + 1;
	tmp_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
				   S_IFREG, 0, goal);
	if (IS_ERR(tmp_inode)) {
		retval = -ENOMEM;
		ext4_journal_stop(handle);
		return retval;
	}
	i_size_write(tmp_inode, i_size_read(inode));
	/*
	 * We don't want the inode to be reclaimed
	 * if we got interrupted in between. We have
	 * this tmp inode carrying reference to the
	 * data blocks of the original file. We set
	 * the i_nlink to zero at the last stage after
	 * switching the original file to extent format
	 */
	tmp_inode->i_nlink = 1;

	ext4_ext_tree_init(handle, tmp_inode);
	ext4_orphan_add(handle, tmp_inode);
	ext4_journal_stop(handle);

	/*
	 * start with one credit accounted for
	 * superblock modification.
	 *
	 * For the tmp_inode we already have commited the
	 * trascation that created the inode. Later as and
	 * when we add extents we extent the journal
	 */
	/*
	 * Even though we take i_mutex we can still cause block
	 * allocation via mmap write to holes. If we have allocated
	 * new blocks we fail migrate.  New block allocation will
	 * clear EXT4_STATE_EXT_MIGRATE flag.  The flag is updated
	 * with i_data_sem held to prevent racing with block
	 * allocation.
	 */
	down_read((&EXT4_I(inode)->i_data_sem));
	ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
	up_read((&EXT4_I(inode)->i_data_sem));

	handle = ext4_journal_start(inode, 1);

	ei = EXT4_I(inode);
	i_data = ei->i_data;
	memset(&lb, 0, sizeof(lb));

	/* 32 bit block address 4 bytes */
	max_entries = inode->i_sb->s_blocksize >> 2;
	for (i = 0; i < EXT4_NDIR_BLOCKS; i++, blk_count++) {
		if (i_data[i]) {
			retval = update_extent_range(handle, tmp_inode,
						le32_to_cpu(i_data[i]),
						blk_count, &lb);
			if (retval)
				goto err_out;
		}
	}
	if (i_data[EXT4_IND_BLOCK]) {
		retval = update_ind_extent_range(handle, tmp_inode,
					le32_to_cpu(i_data[EXT4_IND_BLOCK]),
					&blk_count, &lb);
			if (retval)
				goto err_out;
	} else
		blk_count +=  max_entries;
	if (i_data[EXT4_DIND_BLOCK]) {
		retval = update_dind_extent_range(handle, tmp_inode,
					le32_to_cpu(i_data[EXT4_DIND_BLOCK]),
					&blk_count, &lb);
			if (retval)
				goto err_out;
	} else
		blk_count += max_entries * max_entries;
	if (i_data[EXT4_TIND_BLOCK]) {
		retval = update_tind_extent_range(handle, tmp_inode,
					le32_to_cpu(i_data[EXT4_TIND_BLOCK]),
					&blk_count, &lb);
			if (retval)
				goto err_out;
	}
	/*
	 * Build the last extent
	 */
	retval = finish_range(handle, tmp_inode, &lb);
err_out:
	if (retval)
		/*
		 * Failure case delete the extent information with the
		 * tmp_inode
		 */
		free_ext_block(handle, tmp_inode);
	else {
		retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode);
		if (retval)
			/*
			 * if we fail to swap inode data free the extent
			 * details of the tmp inode
			 */
			free_ext_block(handle, tmp_inode);
	}

	/* We mark the tmp_inode dirty via ext4_ext_tree_init. */
	if (ext4_journal_extend(handle, 1) != 0)
		ext4_journal_restart(handle, 1);

	/*
	 * Mark the tmp_inode as of size zero
	 */
	i_size_write(tmp_inode, 0);

	/*
	 * set the  i_blocks count to zero
	 * so that the ext4_delete_inode does the
	 * right job
	 *
	 * We don't need to take the i_lock because
	 * the inode is not visible to user space.
	 */
	tmp_inode->i_blocks = 0;

	/* Reset the extent details */
	ext4_ext_tree_init(handle, tmp_inode);

	/*
	 * Set the i_nlink to zero so that
	 * generic_drop_inode really deletes the
	 * inode
	 */
	tmp_inode->i_nlink = 0;

	ext4_journal_stop(handle);
	unlock_new_inode(tmp_inode);
	iput(tmp_inode);

	return retval;
}