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btrfs: use better definition of number of compression type

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The compression type upper limit constant is the same as the last value
and this is confusing.  In order to keep coding style consistent, use
BTRFS_NR_COMPRESS_TYPES as the total number that follows the idom of
'NR' being one more than the last value.

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Chengguang Xu
2019-10-10 15:59:57 +08:00
committed by David Sterba
parent b9b1a53e18
commit ce96b7ffd1
4 changed files with 7 additions and 5 deletions
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4
fs/btrfs/compression.h
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@@ -105,7 +105,7 @@ enum btrfs_compression_type {
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LZO = 2,
BTRFS_COMPRESS_ZSTD = 3,
BTRFS_COMPRESS_TYPES = 3,
BTRFS_NR_COMPRESS_TYPES = 4,
};
struct workspace_manager {
@@ -163,7 +163,7 @@ struct btrfs_compress_op {
};
/* The heuristic workspaces are managed via the 0th workspace manager */
#define BTRFS_NR_WORKSPACE_MANAGERS (BTRFS_COMPRESS_TYPES + 1)
#define BTRFS_NR_WORKSPACE_MANAGERS BTRFS_NR_COMPRESS_TYPES
extern const struct btrfs_compress_op btrfs_heuristic_compress;
extern const struct btrfs_compress_op btrfs_zlib_compress;