rbd: introduce abort_on_full option for rbd map

Signed-off-by: Dongsheng Yang <[email protected]>

doc/man/8/rbd.rst

@@ -747,6 +747,10 @@ Per mapping (block device) `rbd device map` options:
   requests will fail with -EOPNOTSUPP, write zeroes requests will fall back to
   manually zeroing.
 
+* abort_on_full - Fail write requests with -ENOSPC when the cluster is full or
+  the data pool reaches its quota (since 5.0).  The default behaviour is to
+  block until the full condition is cleared.
+
 `rbd device unmap` options:
 
 * force - Force the unmapping of a block device that is open (since 4.9).  The

src/tools/rbd/action/Kernel.cc

@@ -148,6 +148,8 @@ static int parse_map_options(const std::string &options_string)
       put_map_option("exclusive", this_char);
     } else if (!strcmp(this_char, "notrim")) {
       put_map_option("notrim", this_char);
+    } else if (!strcmp(this_char, "abort_on_full")) {
+      put_map_option("abort_on_full", this_char);
     } else {
       std::cerr << "rbd: unknown map option '" << this_char << "'" << std::endl;
       return -EINVAL;