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btrfs: compression: add helper for type to string conversion 

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

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-10-31 17:24:26 +01:00
parent bf8d32b9b3
commit e128f9c3f7
2 changed files with 17 additions and 0 deletions
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15
fs/btrfs/compression.c
View File

@ -44,6 +44,21 @@
#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,

2
fs/btrfs/compression.h
View File

@ -137,6 +137,8 @@ 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