btrfs: compression: inline put_workspace

Similar to get_workspace, majority of the callbacks is trivial, we don't
gain anything by the indirection, so replace them by a switch function.
Trivial callback implementations use the helper.
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/compression.c

@@ -39,7 +39,6 @@ int zlib_decompress(struct list_head *ws, unsigned char *data_in,
 struct list_head *zlib_alloc_workspace(unsigned int level);
 void zlib_free_workspace(struct list_head *ws);
 struct list_head *zlib_get_workspace(unsigned int level);
-void zlib_put_workspace(struct list_head *ws);
 
 int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
 		u64 start, struct page **pages, unsigned long *out_pages,
@@ -50,7 +49,6 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
 		size_t destlen);
 struct list_head *lzo_alloc_workspace(unsigned int level);
 void lzo_free_workspace(struct list_head *ws);
-void lzo_put_workspace(struct list_head *ws);
 
 int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
 		u64 start, struct page **pages, unsigned long *out_pages,
@@ -873,11 +871,6 @@ struct heuristic_ws {
 
 static struct workspace_manager heuristic_wsm;
 
-static void heuristic_put_workspace(struct list_head *ws)
-{
-	btrfs_put_workspace(&heuristic_wsm, ws);
-}
-
 static void free_heuristic_ws(struct list_head *ws)
 {
 	struct heuristic_ws *workspace;
@@ -919,7 +912,6 @@ static struct list_head *alloc_heuristic_ws(unsigned int level)
 
 const struct btrfs_compress_op btrfs_heuristic_compress = {
 	.workspace_manager = &heuristic_wsm,
-	.put_workspace = heuristic_put_workspace,
 	.alloc_workspace = alloc_heuristic_ws,
 	.free_workspace = free_heuristic_ws,
 };
@@ -1112,7 +1104,21 @@ void btrfs_put_workspace(struct workspace_manager *wsm, struct list_head *ws)
 
 static void put_workspace(int type, struct list_head *ws)
 {
-	return btrfs_compress_op[type]->put_workspace(ws);
+	struct workspace_manager *wsm;
+
+	wsm = btrfs_compress_op[type]->workspace_manager;
+	switch (type) {
+	case BTRFS_COMPRESS_NONE: return btrfs_put_workspace(wsm, ws);
+	case BTRFS_COMPRESS_ZLIB: return btrfs_put_workspace(wsm, ws);
+	case BTRFS_COMPRESS_LZO:  return btrfs_put_workspace(wsm, ws);
+	case BTRFS_COMPRESS_ZSTD: return zstd_put_workspace(ws);
+	default:
+		/*
+		 * This can't happen, the type is validated several times
+		 * before we get here.
+		 */
+		BUG();
+	}
 }
 
 /*

fs/btrfs/compression.h

@@ -125,8 +125,6 @@ struct list_head *btrfs_get_workspace(struct workspace_manager *wsm,
 void btrfs_put_workspace(struct workspace_manager *wsm, struct list_head *ws);
 
 struct btrfs_compress_op {
-	void (*put_workspace)(struct list_head *ws);
-
 	struct list_head *(*alloc_workspace)(unsigned int level);
 
 	void (*free_workspace)(struct list_head *workspace);

fs/btrfs/lzo.c

@@ -63,11 +63,6 @@ struct workspace {
 
 static struct workspace_manager wsm;
 
-void lzo_put_workspace(struct list_head *ws)
-{
-	btrfs_put_workspace(&wsm, ws);
-}
-
 void lzo_free_workspace(struct list_head *ws)
 {
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
@@ -489,7 +484,6 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
 
 const struct btrfs_compress_op btrfs_lzo_compress = {
 	.workspace_manager	= &wsm,
-	.put_workspace		= lzo_put_workspace,
 	.alloc_workspace	= lzo_alloc_workspace,
 	.free_workspace		= lzo_free_workspace,
 	.max_level		= 1,

fs/btrfs/zlib.c

@@ -39,11 +39,6 @@ struct list_head *zlib_get_workspace(unsigned int level)
 	return ws;
 }
 
-void zlib_put_workspace(struct list_head *ws)
-{
-	btrfs_put_workspace(&wsm, ws);
-}
-
 void zlib_free_workspace(struct list_head *ws)
 {
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
@@ -405,7 +400,6 @@ int zlib_decompress(struct list_head *ws, unsigned char *data_in,
 
 const struct btrfs_compress_op btrfs_zlib_compress = {
 	.workspace_manager	= &wsm,
-	.put_workspace		= zlib_put_workspace,
 	.alloc_workspace	= zlib_alloc_workspace,
 	.free_workspace		= zlib_free_workspace,
 	.max_level		= 9,

fs/btrfs/zstd.c

@@ -708,7 +708,6 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
 const struct btrfs_compress_op btrfs_zstd_compress = {
 	/* ZSTD uses own workspace manager */
 	.workspace_manager = NULL,
-	.put_workspace = zstd_put_workspace,
 	.alloc_workspace = zstd_alloc_workspace,
 	.free_workspace = zstd_free_workspace,
 	.max_level	= ZSTD_BTRFS_MAX_LEVEL,