New API: lvcreate-free: Create logical volume as % of free space.

daemon/lvm.c

@@ -262,6 +262,36 @@ do_lvcreate (const char *logvol, const char *volgroup, int mbytes)
   return 0;
 }
 
+int
+do_lvcreate_free (const char *logvol, const char *volgroup, int percent)
+{
+  char *err;
+  int r;
+
+  if (percent < 0 || percent > 100) {
+    reply_with_error ("percentage must be [0..100] (was %d)", percent);
+    return -1;
+  }
+
+  char size[64];
+  snprintf (size, sizeof size, "%d%%FREE", percent);
+
+  r = command (NULL, &err,
+               "lvm", "lvcreate",
+               "-L", size, "-n", logvol, volgroup, NULL);
+  if (r == -1) {
+    reply_with_error ("%s", err);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  udev_settle ();
+
+  return 0;
+}
+
 int
 do_lvresize (const char *logvol, int mbytes)
 {

generator/generator_actions.ml

@@ -6762,6 +6762,24 @@ in the filesystem is freed.
 In future (but not currently) these zeroed blocks will be
 \"sparsified\" - that is, given back to the host.");
 
+  ("lvcreate_free", (RErr, [String "logvol"; String "volgroup"; Int "percent"], []), 312, [Optional "lvm2"],
+   [InitEmpty, Always, TestOutputList (
+      [["part_disk"; "/dev/sda"; "mbr"];
+       ["pvcreate"; "/dev/sda1"];
+       ["vgcreate"; "VG"; "/dev/sda1"];
+       ["lvcreate_free"; "LV1"; "VG"; "50"];
+       ["lvcreate_free"; "LV2"; "VG"; "50"];
+       ["lvcreate_free"; "LV3"; "VG"; "50"];
+       ["lvcreate_free"; "LV4"; "VG"; "100"];
+       ["lvs"]],
+      ["/dev/VG/LV1"; "/dev/VG/LV2"; "/dev/VG/LV3"; "/dev/VG/LV4"])],
+   "create an LVM logical volume in % remaining free space",
+   "\
+Create an LVM logical volume called C</dev/volgroup/logvol>,
+using approximately C<percent> % of the free space remaining
+in the volume group.  Most usefully, when C<percent> is C<100>
+this will create the largest possible LV.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions

src/MAX_PROC_NR

@@ -1 +1 @@
-311
+312