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virt-resize: Align partitions to multiple of 128 sectors (instead of 64).

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This gives us effectively 64 KByte alignment, optimal for all current
types of storage.
This commit is contained in:
Richard W.M. Jones
2011-10-06 10:22:16 +01:00
parent 36d8bbb858
commit 74e4e86309
1 changed files with 5 additions and 4 deletions
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9
resize/resize.ml
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@@ -144,6 +144,7 @@ read the man page virt-resize(1).
printf "virt-resize\n";
printf "ntfsresize-force\n";
printf "32bitok\n";
printf "128-sector-alignment\n";
let g = new G.guestfs () in
g#add_drive_opts "/dev/null";
g#launch ();
@@ -563,7 +564,7 @@ let calculate_surplus () =
let nr_partitions = List.length partitions in
let overhead = (Int64.of_int sectsize) *^ (
2L *^ 64L +^ (* GPT start and end *)
(64L *^ (Int64.of_int (nr_partitions + 1))) (* Maximum alignment *)
(128L *^ (Int64.of_int (nr_partitions + 1))) (* Maximum alignment *)
) +^
(Int64.of_int (max_bootloader - 64 * 512)) in (* Bootloader *)
@@ -852,7 +853,7 @@ let () =
if !nextpart = 4 then (
g#part_add "/dev/sdb" "extended" !start (-1L);
incr nextpart;
start := !start +^ 64L
start := !start +^ 128L
);
let target_partnum = !nextpart in
let end_ = !start +^ size -^ 1L in
@@ -861,8 +862,8 @@ let () =
target_partnum, end_
) in
(* Start of next partition + alignment to 64 sectors. *)
start := ((end_ +^ 1L) +^ 63L) &^ (~^ 63L);
(* Start of next partition + alignment to 128 sectors. *)
start := ((end_ +^ 1L) +^ 127L) &^ (~^ 127L);
target_partnum
in