|
 |
97ae69 |
From 22aa6ba208a06138fb482231877992c1cd31eb4f Mon Sep 17 00:00:00 2001
|
|
|
ffd6ed |
From: "Richard W.M. Jones" <rjones@redhat.com>
|
|
|
ffd6ed |
Date: Wed, 27 May 2015 10:03:00 -0400
|
|
|
ffd6ed |
Subject: [PATCH] RHEL 7: All qemu-kvm in RHEL 7 supports discard of qcow2
|
|
|
ffd6ed |
(RHBZ#1225467).
|
|
|
ffd6ed |
|
|
|
ffd6ed |
For rationale behind this, see:
|
|
|
ffd6ed |
|
|
|
ffd6ed |
https://bugzilla.redhat.com/show_bug.cgi?id=1225467#c2
|
|
|
ffd6ed |
---
|
|
|
90a56e |
lib/qemu.c | 12 ++----------
|
|
|
ffd6ed |
1 file changed, 2 insertions(+), 10 deletions(-)
|
|
|
ffd6ed |
|
|
|
90a56e |
diff --git a/lib/qemu.c b/lib/qemu.c
|
|
|
97ae69 |
index 6159b5a52..1e52cf75b 100644
|
|
|
90a56e |
--- a/lib/qemu.c
|
|
|
90a56e |
+++ b/lib/qemu.c
|
|
|
97ae69 |
@@ -916,10 +916,6 @@ guestfs_int_discard_possible (guestfs_h *g, struct drive *drv,
|
|
|
ffd6ed |
* discard option on -drive at all.
|
|
|
ffd6ed |
*/
|
|
|
90a56e |
bool qemu15 = guestfs_int_version_ge (qemu_version, 1, 5, 0);
|
|
|
ffd6ed |
- /* qemu >= 1.6. This was the first version that supported unmap on
|
|
|
ffd6ed |
- * qcow2 backing files.
|
|
|
ffd6ed |
- */
|
|
|
90a56e |
- bool qemu16 = guestfs_int_version_ge (qemu_version, 1, 6, 0);
|
|
|
ffd6ed |
|
|
|
ffd6ed |
if (!qemu15)
|
|
|
ffd6ed |
NOT_SUPPORTED (g, false,
|
|
|
97ae69 |
@@ -944,12 +940,8 @@ guestfs_int_discard_possible (guestfs_h *g, struct drive *drv,
|
|
|
ffd6ed |
}
|
|
|
ffd6ed |
else if (STREQ (drv->src.format, "raw"))
|
|
|
ffd6ed |
/* OK */ ;
|
|
|
ffd6ed |
- else if (STREQ (drv->src.format, "qcow2")) {
|
|
|
ffd6ed |
- if (!qemu16)
|
|
|
ffd6ed |
- NOT_SUPPORTED (g, false,
|
|
|
ffd6ed |
- _("discard cannot be enabled on this drive: "
|
|
|
ffd6ed |
- "qemu < 1.6 cannot do discard on qcow2 files"));
|
|
|
ffd6ed |
- }
|
|
|
ffd6ed |
+ else if (STREQ (drv->src.format, "qcow2"))
|
|
|
ffd6ed |
+ /* OK */ ;
|
|
|
ffd6ed |
else {
|
|
|
ffd6ed |
/* It's possible in future other formats will support discard, but
|
|
|
ffd6ed |
* currently (qemu 1.7) none of them do.
|
|
|
ffd6ed |
--
|
|
|
c71420 |
2.20.1
|
|
|
ffd6ed |
|