|
|
0a122b |
From 8be02a0613ef6aee7a95ab7dae3d0aa489b65249 Mon Sep 17 00:00:00 2001
|
|
|
0a122b |
From: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
0a122b |
Date: Tue, 1 Apr 2014 09:45:35 +0200
|
|
|
0a122b |
Subject: [PATCH 2/2] qcow2: link all L2 meta updates in preallocate()
|
|
|
0a122b |
|
|
|
0a122b |
RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
0a122b |
Message-id: <1396345535-19829-1-git-send-email-stefanha@redhat.com>
|
|
|
0a122b |
Patchwork-id: 58320
|
|
|
0a122b |
O-Subject: [RHEL7 qemu-kvm PATCH] qcow2: link all L2 meta updates in preallocate()
|
|
|
0a122b |
Bugzilla: 1081393
|
|
|
0a122b |
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
0a122b |
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
|
|
|
0a122b |
RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
|
|
|
0a122b |
|
|
|
0a122b |
BZ: 1081393
|
|
|
0a122b |
Upstream: not merged yet, http:
|
|
|
0a122b |
BREW: http:
|
|
|
0a122b |
|
|
|
0a122b |
preallocate() only links the first QCowL2Meta's data clusters into the
|
|
|
0a122b |
L2 table and ignores any chained QCowL2Metas in the linked list.
|
|
|
0a122b |
|
|
|
0a122b |
Chains of QCowL2Meta structs are built up when contiguous clusters span
|
|
|
0a122b |
L2 tables. Each QCowL2Meta describes one L2 table update. This is a
|
|
|
0a122b |
rare case in preallocate() but can happen.
|
|
|
0a122b |
|
|
|
0a122b |
This patch fixes preallocate() by iterating over the whole list of
|
|
|
0a122b |
QCowL2Metas. Compare with the qcow2_co_writev() function's
|
|
|
0a122b |
implementation, which is similar but also also handles request
|
|
|
0a122b |
dependencies. preallocate() only performs one allocation at a time so
|
|
|
0a122b |
there can be no dependencies.
|
|
|
0a122b |
|
|
|
0a122b |
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
0a122b |
|
|
|
0a122b |
block/qcow2.c | 7 ++++++-
|
|
|
0a122b |
1 file changed, 6 insertions(+), 1 deletion(-)
|
|
|
0a122b |
|
|
|
0a122b |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
0a122b |
|
|
|
0a122b |
block/qcow2.c | 7 ++++++-
|
|
|
0a122b |
1 files changed, 6 insertions(+), 1 deletions(-)
|
|
|
0a122b |
|
|
|
0a122b |
diff
|
|
|
0a122b |
index 66ed906..7398b16 100644
|
|
|
0a122b |
|
|
|
0a122b |
|
|
|
0a122b |
@@ -1509,7 +1509,9 @@ static int preallocate(BlockDriverState *bs)
|
|
|
0a122b |
return ret;
|
|
|
0a122b |
}
|
|
|
0a122b |
|
|
|
0a122b |
- if (meta != NULL) {
|
|
|
0a122b |
+ while (meta) {
|
|
|
0a122b |
+ QCowL2Meta *next = meta->next;
|
|
|
0a122b |
+
|
|
|
0a122b |
ret = qcow2_alloc_cluster_link_l2(bs, meta);
|
|
|
0a122b |
if (ret < 0) {
|
|
|
0a122b |
qcow2_free_any_clusters(bs, meta->alloc_offset,
|
|
|
0a122b |
@@ -1520,6 +1522,9 @@ static int preallocate(BlockDriverState *bs)
|
|
|
0a122b |
|
|
|
0a122b |
* request from the list of in-flight requests */
|
|
|
0a122b |
QLIST_REMOVE(meta, next_in_flight);
|
|
|
0a122b |
+
|
|
|
0a122b |
+ g_free(meta);
|
|
|
0a122b |
+ meta = next;
|
|
|
0a122b |
}
|
|
|
0a122b |
|
|
|
0a122b |
/* TODO Preallocate data if requested */
|
|
|
0a122b |
--
|
|
|
0a122b |
1.7.1
|
|
|
0a122b |
|