4:53 a.m.
I've messed up a refactor. See 2/2 for details.
Peter Krempa (2):
qemu: block: Don't lookup node names if they are already known
qemu: block: Use correct alias when extracting disk node names
src/qemu/qemu_block.c | 29 ++++++++++++++++++++---------
1 file changed, 20 insertions(+), 9 deletions(-)
--
2.14.1
4:53 a.m.
New subject: [libvirt] [PATCH 1/2] qemu: block: Don't lookup node names if they are already known
Move the check that skips node name detection if they are already
present earlier so that the hash table lookup is skipped.
---
src/qemu/qemu_block.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index 3437302dd..a3da80f88 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -272,13 +272,13 @@ qemuBlockDiskDetectNodes(virDomainDiskDefPtr disk,
qemuBlockNodeNameBackingChainDataPtr entry = NULL;
virStorageSourcePtr src = disk->src;
- if (!(entry = virHashLookup(disktable, disk->info.alias)))
- return 0;
-
/* don't attempt the detection if the top level already has node names */
if (src->nodeformat || src->nodestorage)
return 0;
+ if (!(entry = virHashLookup(disktable, disk->info.alias)))
+ return 0;
+
while (src && entry) {
if (src->nodeformat || src->nodestorage) {
if (STRNEQ_NULLABLE(src->nodeformat, entry->nodeformat) ||
--
2.14.1
4:53 a.m.
New subject: [libvirt] [PATCH 2/2] qemu: block: Use correct alias when extracting disk node names
For some arcane reason we don't use the alias from disk->info.alias
directly but prepend drive in front of it. This messed up the disk node
name extraction code as qemu reports the full alias. This was broken in
the node name detector refactoring done in commit 0175dc6ea024d
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1494327
---
src/qemu/qemu_block.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)
diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index a3da80f88..6faecb0ae 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -20,6 +20,7 @@
#include "qemu_block.h"
#include "qemu_domain.h"
+#include "qemu_alias.h"
#include "viralloc.h"
#include "virstring.h"
@@ -271,36 +272,46 @@ qemuBlockDiskDetectNodes(virDomainDiskDefPtr disk,
{
qemuBlockNodeNameBackingChainDataPtr entry = NULL;
virStorageSourcePtr src = disk->src;
+ char *alias = NULL;
+ int ret = -1;
/* don't attempt the detection if the top level already has node names */
if (src->nodeformat || src->nodestorage)
return 0;
- if (!(entry = virHashLookup(disktable, disk->info.alias)))
- return 0;
+ if (!(alias = qemuAliasFromDisk(disk)))
+ goto cleanup;
+
+ if (!(entry = virHashLookup(disktable, alias))) {
+ ret = 0;
+ goto cleanup;
+ }
while (src && entry) {
if (src->nodeformat || src->nodestorage) {
if (STRNEQ_NULLABLE(src->nodeformat, entry->nodeformat) ||
STRNEQ_NULLABLE(src->nodestorage, entry->nodestorage))
- goto error;
+ goto cleanup;
break;
} else {
if (VIR_STRDUP(src->nodeformat, entry->nodeformat) < 0 ||
VIR_STRDUP(src->nodestorage, entry->nodestorage) < 0)
- goto error;
+ goto cleanup;
}
entry = entry->backing;
src = src->backingStore;
}
- return 0;
+ ret = 0;
- error:
- qemuBlockDiskClearDetectedNodes(disk);
- return -1;
+ cleanup:
+ VIR_FREE(alias);
+ if (ret < 0)
+ qemuBlockDiskClearDetectedNodes(disk);
+
+ return ret;
}
--
2.14.1
5:42 a.m.
New subject: [libvirt] [PATCH 2/2] qemu: block: Use correct alias when extracting disk node names
On Mon, Sep 25, 2017 at 11:53:07AM +0200, Peter Krempa wrote:
For some arcane reason we don't use the alias from
disk->info.alias
directly but prepend drive in front of it.
'disk->info.alias' is used as the ID for the frontend device (eg virtio-blk)
device. IDs must be globally unique in QEMU, so we can't use the same ID
for the backend ('drive') object, hence we must invent a different ID, which
we do by prepending 'drive'.
Regards,
Daniel
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6:10 a.m.
On 09/25/2017 11:53 AM, Peter Krempa wrote:
I've messed up a refactor. See 2/2 for details.
Peter Krempa (2):
qemu: block: Don't lookup node names if they are already known
qemu: block: Use correct alias when extracting disk node names
src/qemu/qemu_block.c | 29 ++++++++++++++++++++---------
1 file changed, 20 insertions(+), 9 deletions(-)
ACK
Michal
2618
days inactive
2618
days old
4 comments
3 participants
participants (3)
-
Daniel P. Berrange -
Michal Privoznik -
Peter Krempa