rbd: small changes

A few very minor changes to the rbd code:
    - RBD_MAX_OPT_LEN is unused, so get rid of it
    - Consolidate rbd options definitions
    - Make rbd_segment_name() return pointer to const char

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 007b726..4ed0741 100644 (file)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -69,7 +69,6 @@
                        (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
 
 #define RBD_MAX_SNAP_COUNT     510     /* allows max snapc to fit in 4KB */
-#define RBD_MAX_OPT_LEN                1024
 
 #define RBD_SNAP_HEAD_NAME     "-"
 
@@ -96,8 +95,6 @@
 #define DEV_NAME_LEN           32
 #define MAX_INT_FORMAT_WIDTH   ((5 * sizeof (int)) / 2 + 1)
 
-#define RBD_READ_ONLY_DEFAULT          false
-
 /*
  * block device image metadata (in-memory version)
  */
@@ -156,10 +153,6 @@ struct rbd_spec {
        struct kref     kref;
 };
 
-struct rbd_options {
-       bool    read_only;
-};
-
 /*
  * an instance of the client.  multiple devices may share an rbd client.
  */
@@ -475,6 +468,12 @@ static match_table_t rbd_opts_tokens = {
        {-1, NULL}
 };
 
+struct rbd_options {
+       bool    read_only;
+};
+
+#define RBD_READ_ONLY_DEFAULT  false
+
 static int parse_rbd_opts_token(char *c, void *private)
 {
        struct rbd_options *rbd_opts = private;
@@ -773,7 +772,7 @@ static void rbd_header_free(struct rbd_image_header *header)
        header->snapc = NULL;
 }
 
-static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
+static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
 {
        char *name;
        u64 segment;
@@ -1338,7 +1337,7 @@ static int rbd_do_op(struct request *rq,
                     struct rbd_req_coll *coll,
                     int coll_index)
 {
-       char *seg_name;
+       const char *seg_name;
        u64 seg_ofs;
        u64 seg_len;
        int ret;