Commit 1a419d85 authored by Li Zefan's avatar Li Zefan
Browse files

btrfs: Allow to specify compress method when defrag 



Update defrag ioctl, so one can choose lzo or zlib when turning
on compression in defrag operation.

Changelog:

v1 -> v2
- Add incompability flag.
- Fix to check invalid compress type.

Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
parent a6fa6fae

fs/btrfs/ioctl.c

+18 −1
Original line number Diff line number Diff line
@@ -638,9 +638,11 @@ static int btrfs_defrag_file(struct file *file, 
	struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;

	struct btrfs_ordered_extent *ordered;

	struct page *page;

	struct btrfs_super_block *disk_super;

	unsigned long last_index;

	unsigned long ra_pages = root->fs_info->bdi.ra_pages;

	unsigned long total_read = 0;

	u64 features;

	u64 page_start;

	u64 page_end;

	u64 last_len = 0;
@@ -648,6 +650,14 @@ static int btrfs_defrag_file(struct file *file, 
	u64 defrag_end = 0;

	unsigned long i;

	int ret;

	int compress_type = BTRFS_COMPRESS_ZLIB;



	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {

		if (range->compress_type > BTRFS_COMPRESS_TYPES)

			return -EINVAL;

		if (range->compress_type)

			compress_type = range->compress_type;

	}



	if (inode->i_size == 0)

		return 0;
@@ -683,7 +693,7 @@ static int btrfs_defrag_file(struct file *file, 
		total_read++;

		mutex_lock(&inode->i_mutex);

		if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)

			BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_ZLIB;

			BTRFS_I(inode)->force_compress = compress_type;



		ret  = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);

		if (ret)
@@ -785,6 +795,13 @@ loop_unlock: 
		mutex_unlock(&inode->i_mutex);

	}



	disk_super = &root->fs_info->super_copy;

	features = btrfs_super_incompat_flags(disk_super);

	if (range->compress_type == BTRFS_COMPRESS_LZO) {

		features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;

		btrfs_set_super_incompat_flags(disk_super, features);

	}



	return 0;



err_reservations:

fs/btrfs/ioctl.h

+8 −1
Original line number Diff line number Diff line
@@ -133,8 +133,15 @@ struct btrfs_ioctl_defrag_range_args { 
	 */

	__u32 extent_thresh;



	/*

	 * which compression method to use if turning on compression

	 * for this defrag operation.  If unspecified, zlib will

	 * be used

	 */

	__u32 compress_type;



	/* spare for later */

	__u32 unused[5];

	__u32 unused[4];

};



struct btrfs_ioctl_space_info {

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