[pve-devel] [PATCH] Add patch to improve qmrestore to RBD, activating writeback cache.

[elacunza at binovo.es]

From: Eneko Lacunza <elacunza at pve-test.binovo.net>

Signed-off-by: Eneko Lacunza <elacunza at binovo.es>
---
 .../0054-vma-force-enable-rbd-cache-for-qmrestore.patch | 17 +++++++++++++++++
 debian/patches/series                                   |  1 +
 2 files changed, 18 insertions(+)
 create mode 100644 debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch

diff --git a/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch b/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
new file mode 100644
index 0000000..d9722c7
--- /dev/null
+++ b/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
@@ -0,0 +1,17 @@
+Issue a bogus flush so that Ceph activates rbd cache, accelerating qmrestore to RBD.
+---
+Index: b/vma.c
+===================================================================
+--- a/vma.c
++++ b/vma.c
+@@ -335,6 +335,9 @@ static int extract_content(int argc, cha
+
+            BlockDriverState *bs = blk_bs(blk);
+
++            /* This is needed to activate rbd cache (writeback/coalesce) */
++            bdrv_flush(bs);
++
+             if (vma_reader_register_bs(vmar, i, bs, write_zero, &errp) < 0) {
+                 g_error("%s", error_get_pretty(errp));
+             }
+
diff --git a/debian/patches/series b/debian/patches/series
index 3614309..c858a30 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -51,6 +51,7 @@ pve/0050-fix-possible-unitialised-return-value.patch
 pve/0051-net-NET_CLIENT_OPTIONS_KIND_MAX-changed.patch
 pve/0052-vnc-refactor-to-QIOChannelSocket.patch
 pve/0053-vma-use-BlockBackend-on-extract.patch
+pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
 #see https://bugs.launchpad.net/qemu/+bug/1488363?comments=all
 extra/0001-Revert-target-i386-disable-LINT0-after-reset.patch
 extra/0001-i386-kvmvapic-initialise-imm32-variable.patch
-- 
2.1.4