storage: Add timeout for iscsi volume's stable path discovery

It might need some time till the LUN's stable path shows up on
initiator host, and although the time window is not foreseeable,
as a better than nothing fix, this patch adds timeout for the
stable path discovery process.

diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index 1d322324257e73620b12cdc932b612395b84ee08..e159bd22abb4c5bc2c285de99c219105c1256947 100644 (file)
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -1347,6 +1347,7 @@ virStorageBackendStablePath(virStoragePoolObjPtr pool,
     struct dirent *dent;
     char *stablepath;
     int opentries = 0;
+    int retry = 0;
 
     /* Short circuit if pool has no target, or if its /dev */
     if (pool->def->target.path == NULL ||
@@ -1355,7 +1356,7 @@ virStorageBackendStablePath(virStoragePoolObjPtr pool,
         goto ret_strdup;
 
     /* Skip whole thing for a pool which isn't in /dev
-     * so we don't mess will filesystem/dir based pools
+     * so we don't mess filesystem/dir based pools
      */
     if (!STRPREFIX(pool->def->target.path, "/dev"))
         goto ret_strdup;
@@ -1384,8 +1385,12 @@ virStorageBackendStablePath(virStoragePoolObjPtr pool,
     /* The pool is pointing somewhere like /dev/disk/by-path
      * or /dev/disk/by-id, so we need to check all symlinks in
      * the target directory and figure out which one points
-     * to this device node
+     * to this device node.
+     *
+     * And it might need some time till the stabe path shows
+     * up, so add timeout to retry here.
      */
+ retry:
     while ((dent = readdir(dh)) != NULL) {
         if (dent->d_name[0] == '.')
             continue;
@@ -1406,6 +1411,11 @@ virStorageBackendStablePath(virStoragePoolObjPtr pool,
         VIR_FREE(stablepath);
     }
 
+    if (++retry < 100) {
+        usleep(100 * 1000);
+        goto retry;
+    }
+
     closedir(dh);
 
  ret_strdup: