From 8d4ed2ad3d55e18361b72c9beb89ec048ac512d8 Mon Sep 17 00:00:00 2001
From: Charles Duffy <charles@dyfis.net>
Date: Thu, 10 Sep 2009 11:13:33 +0200
Subject: [PATCH] Reintroduce support for lzop compression

lzop was removed due to some confusion over whether it provided functional
advantages distinct from xz. This has been addressed in the mailing list post
archived at http://permalink.gmane.org/gmane.comp.emulators.libvirt/16487, and
support for lzop is re-added here.

* libvirt.spec.in: add dependancy on lzop
* src/qemu.conf: update documentation of save_image_format
* src/qemu_driver.c: re-add lzop compression option
---
 libvirt.spec.in   | 1 +
 src/qemu.conf     | 7 ++++---
 src/qemu_driver.c | 9 ++++++---
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/libvirt.spec.in b/libvirt.spec.in
index b01f9c2e9a..0157eeea67 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -117,6 +117,7 @@ Requires: /usr/bin/qemu-img
 # For image compression
 Requires: gzip
 Requires: bzip2
+Requires: lzop
 Requires: xz
 %else
 %if %{with_xen}
diff --git a/src/qemu.conf b/src/qemu.conf
index 342bb8a19c..6d6b86afdb 100644
--- a/src/qemu.conf
+++ b/src/qemu.conf
@@ -134,9 +134,10 @@
 # memory from the domain is dumped out directly to a file.  If you have
 # guests with a large amount of memory, however, this can take up quite
 # a bit of space.  If you would like to compress the images while they
-# are being saved to disk, you can also set "gzip", "bzip2", "lzma", "xz",
-# or "lzop" for save_image_format.  Note that this means you slow down
-# the process of saving a domain in order to save disk space.
+# are being saved to disk, you can also set "lzop", "gzip", "bzip2", or "xz"
+# for save_image_format.  Note that this means you slow down the process of
+# saving a domain in order to save disk space; the list above is in descending
+# order by performance and ascending order by compression ratio.
 #
 # save_image_format = "raw"
 
diff --git a/src/qemu_driver.c b/src/qemu_driver.c
index 8f16e726cb..5c2a8ec255 100644
--- a/src/qemu_driver.c
+++ b/src/qemu_driver.c
@@ -3624,10 +3624,10 @@ enum qemud_save_formats {
     QEMUD_SAVE_FORMAT_BZIP2 = 2,
     /*
      * Deprecated by xz and never used as part of a release
-     * QEMUD_SAVE_FORMAT_LZMA,
-     * QEMUD_SAVE_FORMAT_LZOP,
+     * QEMUD_SAVE_FORMAT_LZMA
      */
     QEMUD_SAVE_FORMAT_XZ = 3,
+    QEMUD_SAVE_FORMAT_LZOP = 4,
     /* Note: add new members only at the end.
        These values are used in the on-disk format.
        Do not change or re-use numbers. */
@@ -3640,7 +3640,8 @@ VIR_ENUM_IMPL(qemudSaveCompression, QEMUD_SAVE_FORMAT_LAST,
               "raw",
               "gzip",
               "bzip2",
-              "xz")
+              "xz",
+              "lzop")
 
 struct qemud_save_header {
     char magic[sizeof(QEMUD_SAVE_MAGIC)-1];
@@ -4384,6 +4385,8 @@ static int qemudDomainRestore(virConnectPtr conn,
             intermediate_argv[0] = "bzip2";
         else if (header.compressed == QEMUD_SAVE_FORMAT_XZ)
             intermediate_argv[0] = "xz";
+        else if (header.compressed == QEMUD_SAVE_FORMAT_LZOP)
+            intermediate_argv[0] = "lzop";
         else if (header.compressed != QEMUD_SAVE_FORMAT_RAW) {
             qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
                              _("Unknown compressed save format %d"),
-- 
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