xen-blkback: enlarge the array size of blkback name

The blkback name is like blkback.domid.xvd[a-z], if domid has four digits
(means larger than 1000), then the backmost xvd wouldn't be fully shown.

Define a BLKBACK_NAME_LEN macro to be 20, enlarge the array size of
blkback name, so it will be fully shown in any case.

Signed-off-by: Tao Chen <boby.chen@huawei.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index e3afe97280b1..b33083e67f8c 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -21,6 +21,9 @@
 #include <xen/grant_table.h>
 #include "common.h"
 
+/* Enlarge the array size in order to fully show blkback name. */
+#define BLKBACK_NAME_LEN (20)
+
 struct backend_info {
         struct xenbus_device    *dev;
         struct xen_blkif        *blkif;
@@ -70,7 +73,7 @@ static int blkback_name(struct xen_blkif *blkif, char *buf)
         else
                 devname  = devpath;
 
-        snprintf(buf, TASK_COMM_LEN, "blkback.%d.%s", blkif->domid, devname);
+        snprintf(buf, BLKBACK_NAME_LEN, "blkback.%d.%s", blkif->domid, devname);
         kfree(devpath);
 
         return 0;
@@ -79,7 +82,7 @@ static int blkback_name(struct xen_blkif *blkif, char *buf)
 static void xen_update_blkif_status(struct xen_blkif *blkif)
 {
         int err;
-        char name[TASK_COMM_LEN];
+        char name[BLKBACK_NAME_LEN];
 
         /* Not ready to connect? */
         if (!blkif->irq || !blkif->vbd.bdev)