[PATCH] btrfs: move enum btrfs_compression_type to the UAPI header

[PATCH] btrfs: move enum btrfs_compression_type to the UAPI header

[Eugene Syromiatnikov]

It is passed in struct btrfs_ioctl_defrag_range_args.compress_type
to BTRFS_IOC_DEFRAG_RANGE, so it has to be a part of UAPI.
Also, rely on enum definition rules to get BTRFS_NR_COMPRESS_TYPES
value and mark it as non-ABI.

Complements: 33ca913349962208 ("btrfs: uapi/linux/btrfs.h migration, move struct btrfs_ioctl_defrag_range_args")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
---
 fs/btrfs/compression.h     |  9 +--------
 include/uapi/linux/btrfs.h | 10 ++++++++++
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index d253f7a..3483b26 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -6,6 +6,7 @@
 #ifndef BTRFS_COMPRESSION_H
 #define BTRFS_COMPRESSION_H
 
+#include <linux/btrfs.h>
 #include <linux/sizes.h>
 
 /*
@@ -100,14 +101,6 @@ blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
 
 unsigned int btrfs_compress_str2level(unsigned int type, const char *str);
 
-enum btrfs_compression_type {
-	BTRFS_COMPRESS_NONE  = 0,
-	BTRFS_COMPRESS_ZLIB  = 1,
-	BTRFS_COMPRESS_LZO   = 2,
-	BTRFS_COMPRESS_ZSTD  = 3,
-	BTRFS_NR_COMPRESS_TYPES = 4,
-};
-
 struct workspace_manager {
 	struct list_head idle_ws;
 	spinlock_t ws_lock;
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index e6b6cb0f..82cc9ac 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -558,6 +558,16 @@ struct btrfs_ioctl_clone_range_args {
  */
 #define BTRFS_DEFRAG_RANGE_COMPRESS 1
 #define BTRFS_DEFRAG_RANGE_START_IO 2
+
+enum btrfs_compression_type {
+	BTRFS_COMPRESS_NONE  = 0,
+	BTRFS_COMPRESS_ZLIB  = 1,
+	BTRFS_COMPRESS_LZO   = 2,
+	BTRFS_COMPRESS_ZSTD  = 3,
+
+	BTRFS_NR_COMPRESS_TYPES /* non-ABI */
+};
+
 struct btrfs_ioctl_defrag_range_args {
 	/* start of the defrag operation */
 	__u64 start;
-- 
2.1.4

Re: [PATCH] btrfs: move enum btrfs_compression_type to the UAPI header

[David Sterba]

On Sun, Apr 19, 2020 at 12:14:32PM +0200, Eugene Syromiatnikov wrote:
> It is passed in struct btrfs_ioctl_defrag_range_args.compress_type
> to BTRFS_IOC_DEFRAG_RANGE, so it has to be a part of UAPI.
> Also, rely on enum definition rules to get BTRFS_NR_COMPRESS_TYPES
> value and mark it as non-ABI.

Adding the compression types makes sense for the UAPI, Qu has sent patch
to move more code to the exported headers ("btrfs: move on-disk
structure definitions to btrfs_tree.h"), including the compression type
definition.

I'd prefer to move the code in a bigger chunk than one by one, unless
it's breaking compilation.