[PATCH v2 1/2] btrfs-progs: defrag: sync the usage ratio/wasted bytes fine-tunning from kernel

[Qu Wenruo <wqu@suse.com>]

This would add the defrag usage ratio and wasted bytes fine-tunning
support for defrag.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 kernel-shared/uapi/btrfs.h | 39 +++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/kernel-shared/uapi/btrfs.h b/kernel-shared/uapi/btrfs.h
index 34e84b89edf2..b595a8deb0be 100644
--- a/kernel-shared/uapi/btrfs.h
+++ b/kernel-shared/uapi/btrfs.h
@@ -642,8 +642,15 @@ _static_assert(sizeof(struct btrfs_ioctl_clone_range_args) == 32);
  * Used by:
  * struct btrfs_ioctl_defrag_range_args.flags
  */
-#define BTRFS_DEFRAG_RANGE_COMPRESS 1
-#define BTRFS_DEFRAG_RANGE_START_IO 2
+#define BTRFS_DEFRAG_RANGE_COMPRESS		(1ULL << 0)
+#define BTRFS_DEFRAG_RANGE_START_IO		(1ULL << 1)
+#define BTRFS_DEFRAG_RANGE_USAGE_RATIO		(1ULL << 2)
+#define BTRFS_DEFRAG_RANGE_WASTED_BYTES		(1ULL << 3)
+#define BTRFS_DEFRAG_RANGE_FLAGS_SUPP	(BTRFS_DEFRAG_RANGE_COMPRESS |	\
+					 BTRFS_DEFRAG_RANGE_START_IO |	\
+					 BTRFS_DEFRAG_RANGE_USAGE_RATIO |\
+					 BTRFS_DEFRAG_RANGE_WASTED_BYTES)
+
 struct btrfs_ioctl_defrag_range_args {
 	/* start of the defrag operation */
 	__u64 start;
@@ -671,8 +678,34 @@ struct btrfs_ioctl_defrag_range_args {
 	 */
 	__u32 compress_type;
 
+	/*
+	 * File extents which has lower usage ratio than this would be defragged.
+	 *
+	 * Valid values are [0, 100].
+	 *
+	 * 0 means no check based on usage ratio.
+	 * 1 means one file extent would be defragged if its referred size
+	 * (file extent num bytes) is smaller than 1% of its on-disk extent size.
+	 * 100 means one file extent would be defragged if its referred size
+	 * (file extent num bytes) is smaller than 100% of its on-disk extent size.
+	 */
+	__u32 usage_ratio;
+
+	/*
+	 * File extents which has more "wasted" bytes than this would be
+	 * defragged.
+	 *
+	 * "Wasted" bytes just means the difference between the file extent size
+	 * (file extent num bytes) against the on-disk extent size
+	 * (file extent disk num bytes).
+	 *
+	 * Valid values are [0, U32_MAX], but values larger than
+	 * BTRFS_MAX_EXTENT_SIZE would not make much sense.
+	 */
+	__u32 wasted_bytes;
+
 	/* spare for later */
-	__u32 unused[4];
+	__u32 unused[2];
 };
 _static_assert(sizeof(struct btrfs_ioctl_defrag_range_args) == 48);
 
-- 
2.44.0