rbd: increase maximum snapshot name length

Change RBD_MAX_SNAP_NAME_LEN to be based on NAME_MAX.  That is a
practical limit for the length of a snapshot name (based on the
presence of a directory using the name under /sys/bus/rbd to
represent the snapshot).

The /sys entry is created by prefixing it with "snap_"; define that
prefix symbolically, and take its length into account in defining
the snapshot name length limit.

Enforce the limit in rbd_add_parse_args().  Also delete a dout()
call in that function that was not meant to be committed.

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

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 4734446c3b5b..4858d925b95e 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -61,7 +61,10 @@
 
 #define RBD_MINORS_PER_MAJOR    256             /* max minors per blkdev */
 
-#define RBD_MAX_SNAP_NAME_LEN   32
+#define RBD_SNAP_DEV_NAME_PREFIX        "snap_"
+#define RBD_MAX_SNAP_NAME_LEN   \
+                        (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
 
@@ -2063,7 +2066,7 @@ static int rbd_register_snap_dev(struct rbd_snap *snap,
         dev->type = &rbd_snap_device_type;
         dev->parent = parent;
         dev->release = rbd_snap_dev_release;
-        dev_set_name(dev, "snap_%s", snap->name);
+        dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name);
         dout("%s: registering device for snapshot %s\n", __func__, snap->name);
 
         ret = device_register(dev);
@@ -2797,8 +2800,13 @@ static char *rbd_add_parse_args(struct rbd_device *rbd_dev,
         if (!rbd_dev->image_name)
                 goto out_err;
 
-        /* Snapshot name is optional */
+        /* Snapshot name is optional; default is to use "head" */
+
         len = next_token(&buf);
+        if (len > RBD_MAX_SNAP_NAME_LEN) {
+                err_ptr = ERR_PTR(-ENAMETOOLONG);
+                goto out_err;
+        }
         if (!len) {
                 buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */
                 len = sizeof (RBD_SNAP_HEAD_NAME) - 1;
@@ -2809,8 +2817,6 @@ static char *rbd_add_parse_args(struct rbd_device *rbd_dev,
         memcpy(snap_name, buf, len);
         *(snap_name + len) = '\0';
 
-dout("    SNAP_NAME is <%s>, len is %zd\n", snap_name, len);
-
         return snap_name;
 
 out_err: