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Hu Tao

2014-Sep-22 07:47 UTC

[Libguestfs] [PATCH v3 0/7] add support to resize MBR logical partitions

Hi Rich,

This is v3 series to add support for resizing MBR logical partitions.

changes to v2:
  1. remove p_part_num
  2. remove filter_parts
  3. name the function calculate_target_partitions
  4. remove the code to restart guest introduced in v2 

changes to v1:
  1. spit the patches so it's easier to review
  2. fix the parted error caused by unaligned logical partitions
  3. extend the content of logical partitions
  4. refactor to make logical partitions a seperate list

Hu Tao (7):
  resize: introduce partition_type
  resize: simplify the code to filter parts
  resize: add function find_partitions
  resize: add function calculate_target_partitions
  resize: add function mbr_part_type
  resize: add partition type LogicalPartition
  resize: add support to resize logical partitions

 resize/resize.ml | 145 +++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 110 insertions(+), 35 deletions(-)

-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 1/7] resize: introduce partition_type

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/resize/resize.ml b/resize/resize.ml
index 356303c..72c4da2 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -73,6 +73,9 @@ and partition_id    | MBR_ID of int                (* MBR ID.
*)
   | GPT_Type of string           (* GPT UUID. *)
 
+type partition_type +  | PrimaryPartition
+
 let rec debug_partition p    eprintf "%s:\n" p.p_name;
   eprintf "\tpartition data: %ld %Ld-%Ld (%Ld bytes)\n"
-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 2/7] resize: simplify the code to filter parts

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 72c4da2..8f2105c 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -454,13 +454,8 @@ read the man page virt-resize(1).
 
     (* Filter out logical partitions.  See note above. *)
     let parts -      match parttype with
-      | GPT -> parts
-      | MBR ->
-        List.filter (function
-        | { G.part_num = part_num } when part_num >= 5_l -> false
-        | _ -> true
-        ) parts in
+        List.filter (fun p -> parttype <> MBR || p.G.part_num <=
4_l)
+        parts in
 
     let partitions        List.map (
-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 3/7] resize: add function find_partitions

find_partitions can find partitions of given type.

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 8f2105c..cfd02fc 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -446,14 +446,15 @@ read the man page virt-resize(1).
     | MBR_ID _ | GPT_Type _ | No_ID -> false
   in
 
-  let partitions : partition list +  let find_partitions part_type      let
parts = Array.to_list (g#part_list "/dev/sda") in
 
-    if List.length parts = 0 then
-      error (f_"the source disk has no partitions");
-
     (* Filter out logical partitions.  See note above. *)
     let parts +      match part_type with
+      (* for GPT, all partitions are regarded as Primary Partition,
+       * e.g. there is no Extended Partition or Logical Partition. *)
+      | PrimaryPartition ->
         List.filter (fun p -> parttype <> MBR || p.G.part_num <=
4_l)
         parts in
 
@@ -485,11 +486,6 @@ read the man page virt-resize(1).
             p_target_start = 0L; p_target_end = 0L }
       ) parts in
 
-    if verbose then (
-      eprintf "%d partitions found\n" (List.length partitions);
-      List.iter debug_partition partitions
-    );
-
     (* Check content isn't larger than partitions.  If it is then
      * something has gone wrong and we shouldn't continue.  Old
      * virt-resize didn't do these checks.
@@ -521,6 +517,13 @@ read the man page virt-resize(1).
 
     partitions in
 
+  let partitions = find_partitions PrimaryPartition in
+
+  if verbose then (
+    eprintf "%d partitions found\n" (List.length partitions);
+    List.iter debug_partition partitions
+    );
+
   (* Build a data structure describing LVs on the source disk. *)
   let lvs      let lvs = Array.to_list (g#lvs ()) in
-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[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

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 5/7] resize: add function mbr_part_type

Function mbr_part_type returns one of "primary", "extended"
and
"logical". The type is used by parted when adding partitions.

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 8b43306..c56a91a 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -1091,10 +1091,17 @@ read the man page virt-resize(1).
 
     calculate_target_partitions 1 start ~create_surplus:true partitions in
 
+  (* For GPT, the part type simply becomes partition name, so we don't
+   * handle the case specifically. *)
+  let mbr_part_type x +    if x.p_part.G.part_num <= 4l && x.p_type
<> ContentExtendedPartition then "primary"
+    else if x.p_part.G.part_num <= 4l && x.p_type =
ContentExtendedPartition then "extended"
+    else "logical" in
+
   (* Now partition the target disk. *)
   List.iter (
     fun p ->
-      g#part_add "/dev/sdb" "primary" p.p_target_start
p.p_target_end
+      g#part_add "/dev/sdb" (mbr_part_type p) p.p_target_start
p.p_target_end
   ) partitions;
 
   (* Copy over the data. *)
-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 6/7] resize: add partition type LogicalPartition

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index c56a91a..3f804a0 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -75,6 +75,7 @@ and partition_id  
 type partition_type    | PrimaryPartition
+  | LogicalPartition
 
 let rec debug_partition p    eprintf "%s:\n" p.p_name;
@@ -449,13 +450,15 @@ read the man page virt-resize(1).
   let find_partitions part_type      let parts = Array.to_list (g#part_list
"/dev/sda") in
 
-    (* Filter out logical partitions.  See note above. *)
     let parts        match part_type with
       (* for GPT, all partitions are regarded as Primary Partition,
        * e.g. there is no Extended Partition or Logical Partition. *)
       | PrimaryPartition ->
         List.filter (fun p -> parttype <> MBR || p.G.part_num <=
4_l)
+        parts
+      | LogicalPartition ->
+        List.filter (fun p -> parttype = MBR && p.G.part_num >=
5_l)
         parts in
 
     let partitions @@ -518,10 +521,12 @@ read the man page virt-resize(1).
     partitions in
 
   let partitions = find_partitions PrimaryPartition in
+  let logical_partitions = find_partitions LogicalPartition in
 
   if verbose then (
-    eprintf "%d partitions found\n" (List.length partitions);
-    List.iter debug_partition partitions
+    eprintf "%d partitions found\n" (List.length partitions +
List.length logical_partitions);
+    List.iter debug_partition partitions;
+    List.iter debug_partition logical_partitions
     );
 
   (* Build a data structure describing LVs on the source disk. *)
-- 
1.9.3

Hu Tao

2014-Sep-22 07:47 UTC

head link

[Libguestfs] [PATCH v3 7/7] resize: add support to resize logical partitions

Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
---
 resize/resize.ml | 82 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 72 insertions(+), 10 deletions(-)

diff --git a/resize/resize.ml b/resize/resize.ml
index 3f804a0..ea0be9e 100644
--- a/resize/resize.ml
+++ b/resize/resize.ml
@@ -596,6 +596,8 @@ read the man page virt-resize(1).
     let hash = Hashtbl.create 13 in
     List.iter (fun ({ p_name = name } as p) -> Hashtbl.add hash name p)
       partitions;
+    List.iter (fun ({ p_name = name } as p) -> Hashtbl.add hash name p)
+      logical_partitions;
     fun ~option name ->
       let name          if String.length name < 5 || String.sub name 0 5
<> "/dev/" then
@@ -719,8 +721,10 @@ read the man page virt-resize(1).
     (* We need some overhead for partitioning. *)
     let overhead        let maxl64 = List.fold_left max 0L in
+      let alignment = if alignment = 1L then 2L else alignment in
 
       let nr_partitions = List.length partitions in
+      let nr_partitions = nr_partitions + List.length logical_partitions in
 
       let gpt_start_sects = 64L in
       let gpt_end_sects = gpt_start_sects in
@@ -748,12 +752,25 @@ read the man page virt-resize(1).
     let required = List.fold_left (
       fun total p ->
         let newsize +          (* don't count extended partition but
logical partitions below,
+           * because we may extend and resize logical partitions at
+           * the same time. *)
+          if p.p_type = ContentExtendedPartition then 0L else
+            match p.p_operation with
+            | OpCopy | OpIgnore -> p.p_part.G.part_size
+            | OpDelete -> 0L
+            | OpResize newsize -> newsize in
+        total +^ newsize
+    ) 0L partitions in
+    let required = required +^ List.fold_left (
+      fun total p ->
+        let newsize            match p.p_operation with
           | OpCopy | OpIgnore -> p.p_part.G.part_size
           | OpDelete -> 0L
           | OpResize newsize -> newsize in
         total +^ newsize
-    ) 0L partitions in
+    ) 0L logical_partitions in
 
     let surplus = outsize -^ (required +^ overhead) in
 
@@ -799,6 +816,28 @@ read the man page virt-resize(1).
     )
   );
 
+  (* handle resizing of logical partitions *)
+  List.iter (
+    fun p ->
+      if p.p_type = ContentExtendedPartition then (
+        let alignment = if alignment = 1L then 2L else alignment in
+        let size = roundup64 p.p_part.G.part_size sectsize in
+        let logical_sizes = List.fold_left (
+          fun total p ->
+            match p.p_operation with
+              | OpDelete -> total +^ 0L
+              | OpCopy | OpIgnore -> total +^ (roundup64
p.p_part.G.part_size (alignment *^ sectsize))
+              | OpResize newsize -> total +^ (roundup64 newsize (alignment
*^ sectsize))
+          ) 0L logical_partitions in
+        (* the first logical partition is aligned *)
+        let logical_sizes = logical_sizes +^ alignment *^ sectsize in
+        if logical_sizes > size then
+          p.p_operation <- OpResize logical_sizes
+        (* don't touch the extended partition if logical sizes less
+         * then the original size *)
+      )
+  ) partitions;
+
   (* Calculate the final surplus.
    * At this point, this number must be >= 0.
    *)
@@ -857,6 +896,7 @@ read the man page virt-resize(1).
         wrap ~indent:4 (text ^ "\n\n") in
 
     List.iter print_summary partitions;
+    List.iter print_summary logical_partitions;
 
     List.iter (
       fun ({ lv_name = name } as lv) ->
@@ -1030,6 +1070,7 @@ read the man page virt-resize(1).
         | OpDelete -> calculate_target_partitions partnum start
~create_surplus ps (* skip p *)
 
         | OpIgnore | OpCopy ->          (* same size *)
+          let start = roundup64 start 2L in
           (* Size in sectors. *)
           let size = div_roundup64 p.p_part.G.part_size sectsize in
           (* Start of next partition + alignment. *)
@@ -1044,6 +1085,7 @@ read the man page virt-resize(1).
             p_target_partnum = partnum } :: calculate_target_partitions
(partnum+1) next ~create_surplus ps
 
         | OpResize newsize ->           (* resized partition *)
+          let start = roundup64 start 2L in
           (* New size in sectors. *)
           let size = div_roundup64 newsize sectsize in
           (* Start of next partition + alignment. *)
@@ -1054,7 +1096,9 @@ read the man page virt-resize(1).
             eprintf "target partition %d: resize: newsize=%Ld start=%Ld
end=%Ld\n%!"
               partnum newsize start (next -^ 1L);
 
-          { p with p_target_start = start; p_target_end = next -^ 1L;
+          (* there must be a at least 1-sector gap between logical
+           * partitions otherwise parted refused to add logical partition *)
+          { p with p_target_start = start; p_target_end = next -^ 2L;
             p_target_partnum = partnum } :: calculate_target_partitions
(partnum+1) next ~create_surplus ps
         )
 
@@ -1096,6 +1140,16 @@ read the man page virt-resize(1).
 
     calculate_target_partitions 1 start ~create_surplus:true partitions in
 
+  let logical_partitions +    let start = List.fold_left (
+      fun total p ->
+        match p.p_type with
+          | ContentExtendedPartition -> total +^ p.p_target_start | _ ->
0L ) 0L partitions
+    in
+    (* align logical partitions, too *)
+    let start = roundup64 (start +^ 1L) alignment in
+    calculate_target_partitions 5 start ~create_surplus:false
logical_partitions in
+
   (* For GPT, the part type simply becomes partition name, so we don't
    * handle the case specifically. *)
   let mbr_part_type x @@ -1109,6 +1163,11 @@ read the man page virt-resize(1).
       g#part_add "/dev/sdb" (mbr_part_type p) p.p_target_start
p.p_target_end
   ) partitions;
 
+  List.iter (
+    fun p ->
+      g#part_add "/dev/sdb" "logical" p.p_target_start
p.p_target_end
+  ) logical_partitions;
+
   (* Copy over the data. *)
   let copy_partition p        match p.p_operation with
@@ -1134,18 +1193,12 @@ read the man page virt-resize(1).
          | ContentUnknown | ContentPV _ | ContentFS _ ->
            g#copy_device_to_device ~size:copysize ~sparse source target
 
-         | ContentExtendedPartition ->
-           (* You can't just copy an extended partition by name, eg.
-            * source = "/dev/sda2", because the device name only
covers
-            * the first 1K of the partition.  Instead, copy the
-            * source bytes from the parent disk (/dev/sda).
-            *)
-           let srcoffset = p.p_part.G.part_start in
-           g#copy_device_to_device ~srcoffset ~size:copysize
"/dev/sda" target
+         | ContentExtendedPartition -> ()
         )
       | OpIgnore | OpDelete -> ()
   in
   List.iter copy_partition partitions;
+  List.iter copy_partition logical_partitions;
 
   (* Set bootable and MBR IDs.  Do this *after* copying over the data,
    * so that we can magically change the primary partition to an extended
@@ -1169,6 +1222,7 @@ read the man page virt-resize(1).
       | GPT, (No_ID|MBR_ID _) | MBR, (No_ID|GPT_Type _) -> ()
   in
   List.iter set_partition_bootable_and_id partitions;
+  List.iter set_partition_bootable_and_id logical_partitions;
 
   (* Fix the bootloader if we aligned the first partition. *)
   if align_first_partition_and_fix_bootloader then (
@@ -1221,6 +1275,13 @@ read the man page virt-resize(1).
         can_expand_content p.p_type
       | { p_operation = (OpCopy | OpIgnore | OpDelete) } -> false
     ) partitions
+    ||
+    List.exists (
+      function
+      | ({ p_operation = OpResize _ } as p) ->
+        can_expand_content p.p_type
+      | { p_operation = (OpCopy | OpIgnore | OpDelete) } -> false
+    ) logical_partitions
     || List.exists (
       function
       | ({ lv_operation = LVOpExpand } as lv) ->
@@ -1283,6 +1344,7 @@ read the man page virt-resize(1).
         -> ()
     in
     List.iter expand_partition_content partitions;
+    List.iter expand_partition_content logical_partitions;
 
     (* Expand logical volume content as required. *)
     List.iter (
-- 
1.9.3

Richard W.M. Jones

2014-Sep-22 15:48 UTC

head link

Re: [Libguestfs] [PATCH v3 2/7] resize: simplify the code to filter parts

On Mon, Sep 22, 2014 at 03:47:35PM +0800, Hu Tao wrote:> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  resize/resize.ml | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/resize/resize.ml b/resize/resize.ml
> index 72c4da2..8f2105c 100644
> --- a/resize/resize.ml
> +++ b/resize/resize.ml
> @@ -454,13 +454,8 @@ read the man page virt-resize(1).
>  
>      (* Filter out logical partitions.  See note above. *)
>      let parts > -      match parttype with
> -      | GPT -> parts
> -      | MBR ->
> -        List.filter (function
> -        | { G.part_num = part_num } when part_num >= 5_l -> false
> -        | _ -> true
> -        ) parts in
> +        List.filter (fun p -> parttype <> MBR || p.G.part_num
<= 4_l)
> +        parts in
>  
>      let partitions >        List.map (
ACK.  I'll push this later today.

Thanks,

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

Richard W.M. Jones

2014-Sep-22 15:51 UTC

head link

Re: [Libguestfs] [PATCH v3 3/7] resize: add function find_partitions

On Mon, Sep 22, 2014 at 03:47:36PM +0800, Hu Tao wrote:> find_partitions can find partitions of given type.
> 
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  resize/resize.ml | 21 ++++++++++++---------
>  1 file changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/resize/resize.ml b/resize/resize.ml
> index 8f2105c..cfd02fc 100644
> --- a/resize/resize.ml
> +++ b/resize/resize.ml
> @@ -446,14 +446,15 @@ read the man page virt-resize(1).
>      | MBR_ID _ | GPT_Type _ | No_ID -> false
>    in
>  
> -  let partitions : partition list > +  let find_partitions part_type
>      let parts = Array.to_list (g#part_list "/dev/sda") in
>  
> -    if List.length parts = 0 then
> -      error (f_"the source disk has no partitions");
> -
>      (* Filter out logical partitions.  See note above. *)
>      let parts > +      match part_type with
> +      (* for GPT, all partitions are regarded as Primary Partition,
> +       * e.g. there is no Extended Partition or Logical Partition. *)
> +      | PrimaryPartition ->
>          List.filter (fun p -> parttype <> MBR || p.G.part_num
<= 4_l)
>          parts in
>  
> @@ -485,11 +486,6 @@ read the man page virt-resize(1).
>              p_target_start = 0L; p_target_end = 0L }
>        ) parts in
>  
> -    if verbose then (
> -      eprintf "%d partitions found\n" (List.length partitions);
> -      List.iter debug_partition partitions
> -    );
> -
>      (* Check content isn't larger than partitions.  If it is then
>       * something has gone wrong and we shouldn't continue.  Old
>       * virt-resize didn't do these checks.
> @@ -521,6 +517,13 @@ read the man page virt-resize(1).
>  
>      partitions in
>  
> +  let partitions = find_partitions PrimaryPartition in
> +
> +  if verbose then (
> +    eprintf "%d partitions found\n" (List.length partitions);
> +    List.iter debug_partition partitions
> +    );
> +
>    (* Build a data structure describing LVs on the source disk. *)
>    let lvs >      let lvs = Array.to_list (g#lvs ()) in
Let's combine patches 01 and 03 into a single patch.

Otherwise, this looks fine to me.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top

Richard W.M. Jones

2014-Sep-22 15:52 UTC

head link

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

On Mon, Sep 22, 2014 at 03:47:37PM +0800, Hu Tao wrote:> 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
Yes, this looks fine now, although the indentation is wrong for
the final patch (but easier to review!)

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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Richard W.M. Jones

2014-Sep-22 15:55 UTC

head link

Re: [Libguestfs] [PATCH v3 5/7] resize: add function mbr_part_type

On Mon, Sep 22, 2014 at 03:47:38PM +0800, Hu Tao wrote:> Function mbr_part_type returns one of "primary",
"extended" and
> "logical". The type is used by parted when adding partitions.
> 
> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  resize/resize.ml | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/resize/resize.ml b/resize/resize.ml
> index 8b43306..c56a91a 100644
> --- a/resize/resize.ml
> +++ b/resize/resize.ml
> @@ -1091,10 +1091,17 @@ read the man page virt-resize(1).
>  
>      calculate_target_partitions 1 start ~create_surplus:true partitions in
>  
> +  (* For GPT, the part type simply becomes partition name, so we don't
> +   * handle the case specifically. *)
> +  let mbr_part_type x > +    if x.p_part.G.part_num <= 4l &&
x.p_type <> ContentExtendedPartition then "primary"
> +    else if x.p_part.G.part_num <= 4l && x.p_type =
ContentExtendedPartition then "extended"
> +    else "logical" in
> +
>    (* Now partition the target disk. *)
>    List.iter (
>      fun p ->
> -      g#part_add "/dev/sdb" "primary" p.p_target_start
p.p_target_end
> +      g#part_add "/dev/sdb" (mbr_part_type p) p.p_target_start
p.p_target_end
>    ) partitions;
>  
>    (* Copy over the data. *)
I don't think the comment is true:

  $ guestfish -N disk -- \
        part-init /dev/sda gpt : part-add /dev/sda "foo" 100 -100
  libguestfs: error: part_add: unknown partition type: foo: this should be
"primary", "logical" or "extended"

The mbr_part_type function just has to be changed so it always returns
"primary" is the part_type = GPT.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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Richard W.M. Jones

2014-Sep-22 15:56 UTC

head link

Re: [Libguestfs] [PATCH v3 6/7] resize: add partition type LogicalPartition

On Mon, Sep 22, 2014 at 03:47:39PM +0800, Hu Tao wrote:> Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
> ---
>  resize/resize.ml | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/resize/resize.ml b/resize/resize.ml
> index c56a91a..3f804a0 100644
> --- a/resize/resize.ml
> +++ b/resize/resize.ml
> @@ -75,6 +75,7 @@ and partition_id >  
>  type partition_type >    | PrimaryPartition
> +  | LogicalPartition
>  
>  let rec debug_partition p >    eprintf "%s:\n" p.p_name;
> @@ -449,13 +450,15 @@ read the man page virt-resize(1).
>    let find_partitions part_type >      let parts = Array.to_list
(g#part_list "/dev/sda") in
>  
> -    (* Filter out logical partitions.  See note above. *)
>      let parts >        match part_type with
>        (* for GPT, all partitions are regarded as Primary Partition,
>         * e.g. there is no Extended Partition or Logical Partition. *)
>        | PrimaryPartition ->
>          List.filter (fun p -> parttype <> MBR || p.G.part_num
<= 4_l)
> +        parts
> +      | LogicalPartition ->
> +        List.filter (fun p -> parttype = MBR && p.G.part_num
>= 5_l)
>          parts in
>  
>      let partitions > @@ -518,10 +521,12 @@ read the man page
virt-resize(1).
>      partitions in
>  
>    let partitions = find_partitions PrimaryPartition in
> +  let logical_partitions = find_partitions LogicalPartition in
>  
>    if verbose then (
> -    eprintf "%d partitions found\n" (List.length partitions);
> -    List.iter debug_partition partitions
> +    eprintf "%d partitions found\n" (List.length partitions +
List.length logical_partitions);
> +    List.iter debug_partition partitions;
> +    List.iter debug_partition logical_partitions
>      );
>  
>    (* Build a data structure describing LVs on the source disk. *)
> -- 
> 1.9.3
This looks fine now.

Rich.

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Richard W.M. Jones

2014-Sep-22 15:58 UTC

head link

Re: [Libguestfs] [PATCH v3 7/7] resize: add support to resize logical partitions

I'm going to have to test the heck out of patch 07 to really
understand what it is doing and whether it works.  Our current
virt-resize test suite isn't really up to the job.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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[Libguestfs] [PATCH v3 0/7] add support to resize MBR logical partitions

[Libguestfs] [PATCH v3 1/7] resize: introduce partition_type

[Libguestfs] [PATCH v3 2/7] resize: simplify the code to filter parts

[Libguestfs] [PATCH v3 3/7] resize: add function find_partitions

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

[Libguestfs] [PATCH v3 5/7] resize: add function mbr_part_type

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