Update for lzo support

[Btrfs-Progs][V2] Update for lzo support

- Add incompat flag, otherwise btrfs-progs will report error
  when operating on btrfs filesystems mounted with lzo option.

- Update man page.

- Allow to turn on lzo compression for defrag operation:

  # btrfs filesystem defragment -c[zlib, lzo] <file>

  Note: "-c zlib" will fail, because that's how getopt() works
  for optional arguments.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/ioctl.h b/ioctl.h
index 776d7a9f..bb7b9e08 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -116,8 +116,15 @@ 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 {