[for-4.14,1/2] btrfs: compression: add helper for type to string conversion

Commit Message

Johannes Thumshirn Sept. 16, 2019, 8:17 a.m. UTC

From: David Sterba <[e-mail]>

[ Upstream commit e128f9c3f7242318e1c76d204c7ae32bc878b8c7 ]

There are several places opencoding this conversion, add a helper now
that we have 3 compression algorithms.

Signed-off-by: David Sterba <[e-mail]>
Signed-off-by: Johannes Thumshirn <[e-mail]>
---
 fs/btrfs/compression.c | 15 +++++++++++++++
 fs/btrfs/compression.h |  2 ++
 2 files changed, 17 insertions(+)

Patch

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 280384bf34f1..d7aa96e1fc36 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -43,6 +43,21 @@ 
 #include "extent_io.h"
 #include "extent_map.h"
 
+static const char* const btrfs_compress_types[] = { "", "zlib", "lzo", "zstd" };
+
+const char* btrfs_compress_type2str(enum btrfs_compression_type type)
+{
+	switch (type) {
+	case BTRFS_COMPRESS_ZLIB:
+	case BTRFS_COMPRESS_LZO:
+	case BTRFS_COMPRESS_ZSTD:
+	case BTRFS_COMPRESS_NONE:
+		return btrfs_compress_types[type];
+	}
+
+	return NULL;
+}
+
 static int btrfs_decompress_bio(struct compressed_bio *cb);
 
 static inline int compressed_bio_size(struct btrfs_fs_info *fs_info,
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index d2781ff8f994..adb704757955 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -130,6 +130,8 @@  extern const struct btrfs_compress_op btrfs_zlib_compress;
 extern const struct btrfs_compress_op btrfs_lzo_compress;
 extern const struct btrfs_compress_op btrfs_zstd_compress;
 
+const char* btrfs_compress_type2str(enum btrfs_compression_type type);
+
 int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);
 
 #endif