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[Libguestfs] [PATCH v3 4/7] resize: add function calculate_target_partitions



And introduce parameter create_surplus to indicate whether to
create surplus partition or not. Later this parameter will be
used by when calculating positions for target logical partitions.

Signed-off-by: Hu Tao <hutao cn fujitsu com>
---
 resize/resize.ml | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index cfd02fc..8b43306 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -1019,11 +1019,10 @@ read the man page virt-resize(1).
    * the final list just contains partitions that need to be created
    * on the target.
    *)
-  let partitions =
-    let rec loop partnum start = function
+    let rec calculate_target_partitions partnum start ~create_surplus = function
       | p :: ps ->
         (match p.p_operation with
-        | OpDelete -> loop partnum start ps (* skip p *)
+        | OpDelete -> calculate_target_partitions partnum start ~create_surplus ps (* skip p *)
 
         | OpIgnore | OpCopy ->          (* same size *)
           (* Size in sectors. *)
@@ -1037,7 +1036,7 @@ read the man page virt-resize(1).
               partnum start (end_ -^ 1L);
 
           { p with p_target_start = start; p_target_end = end_ -^ 1L;
-            p_target_partnum = partnum } :: loop (partnum+1) next ps
+            p_target_partnum = partnum } :: calculate_target_partitions (partnum+1) next ~create_surplus ps
 
         | OpResize newsize ->           (* resized partition *)
           (* New size in sectors. *)
@@ -1051,12 +1050,12 @@ read the man page virt-resize(1).
               partnum newsize start (next -^ 1L);
 
           { p with p_target_start = start; p_target_end = next -^ 1L;
-            p_target_partnum = partnum } :: loop (partnum+1) next ps
+            p_target_partnum = partnum } :: calculate_target_partitions (partnum+1) next ~create_surplus ps
         )
 
       | [] ->
         (* Create the surplus partition if there is room for it. *)
-        if extra_partition && surplus >= min_extra_partition then (
+        if create_surplus && extra_partition && surplus >= min_extra_partition then (
           [ {
             (* Since this partition has no source, this data is
              * meaningless and not used since the operation is
@@ -1077,6 +1076,7 @@ read the man page virt-resize(1).
         else
           [] in
 
+  let partitions =
     (* Choose the alignment of the first partition based on the
      * '--align-first' option.  Old virt-resize used to always align this
      * to 64 sectors, but this causes boot failures unless we are able to
@@ -1089,7 +1089,7 @@ read the man page virt-resize(1).
         (* Preserve the existing start, but convert to sectors. *)
         (List.hd partitions).p_part.G.part_start /^ sectsize in
 
-    loop 1 start partitions in
+    calculate_target_partitions 1 start ~create_surplus:true partitions in
 
   (* Now partition the target disk. *)
   List.iter (
-- 
1.9.3


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