From 69e18f4dbedfbf208452e9da9979c92da30d2442 Mon Sep 17 00:00:00 2001 From: Dan Streetman Date: Fri, 6 Nov 2015 16:29:18 -0800 Subject: [PATCH] zpool: remove redundant zpool->type string, const-ify zpool_get_type Make the return type of zpool_get_type const; the string belongs to the zpool driver and should not be modified. Remove the redundant type field in the struct zpool; it is private to zpool.c and isn't needed since ->driver->type can be used directly. Add comments indicating strings must be null-terminated. Signed-off-by: Dan Streetman Cc: Sergey Senozhatsky Cc: Seth Jennings Cc: Minchan Kim Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/zpool.h | 2 +- mm/zpool.c | 14 ++++++++------ 2 files changed, 9 insertions(+), 7 deletions(-) diff --git a/include/linux/zpool.h b/include/linux/zpool.h index 42f8ec992452..1f405bee3cd5 100644 --- a/include/linux/zpool.h +++ b/include/linux/zpool.h @@ -41,7 +41,7 @@ bool zpool_has_pool(char *type); struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, const struct zpool_ops *ops); -char *zpool_get_type(struct zpool *pool); +const char *zpool_get_type(struct zpool *pool); void zpool_destroy_pool(struct zpool *pool); diff --git a/mm/zpool.c b/mm/zpool.c index 8f670d3e8706..13f524dcf215 100644 --- a/mm/zpool.c +++ b/mm/zpool.c @@ -18,8 +18,6 @@ #include struct zpool { - char *type; - struct zpool_driver *driver; void *pool; const struct zpool_ops *ops; @@ -73,6 +71,7 @@ int zpool_unregister_driver(struct zpool_driver *driver) } EXPORT_SYMBOL(zpool_unregister_driver); +/* this assumes @type is null-terminated. */ static struct zpool_driver *zpool_get_driver(char *type) { struct zpool_driver *driver; @@ -113,6 +112,8 @@ static void zpool_put_driver(struct zpool_driver *driver) * not be loaded, and calling @zpool_create_pool() with the pool type will * fail. * + * The @type string must be null-terminated. + * * Returns: true if @type pool is available, false if not */ bool zpool_has_pool(char *type) @@ -145,6 +146,8 @@ EXPORT_SYMBOL(zpool_has_pool); * * Implementations must guarantee this to be thread-safe. * + * The @type and @name strings must be null-terminated. + * * Returns: New zpool on success, NULL on failure. */ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, @@ -174,7 +177,6 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, return NULL; } - zpool->type = driver->type; zpool->driver = driver; zpool->pool = driver->create(name, gfp, ops, zpool); zpool->ops = ops; @@ -208,7 +210,7 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp, */ void zpool_destroy_pool(struct zpool *zpool) { - pr_debug("destroying pool type %s\n", zpool->type); + pr_debug("destroying pool type %s\n", zpool->driver->type); spin_lock(&pools_lock); list_del(&zpool->list); @@ -228,9 +230,9 @@ void zpool_destroy_pool(struct zpool *zpool) * * Returns: The type of zpool. */ -char *zpool_get_type(struct zpool *zpool) +const char *zpool_get_type(struct zpool *zpool) { - return zpool->type; + return zpool->driver->type; } /** -- 2.20.1