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qemu: Switch snapshot deletion to the new API functions

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Use the new storage driver APIs to delete snapshot backing files in case
of failure instead of directly relying on "unlink". This will help us in
the future when we will be adding network based storage without local
representation in the host.
This commit is contained in:
Peter Krempa 2014-01-31 14:26:32 +01:00
parent a44b7b87bc
commit 8f4091d677
2 changed files with 15 additions and 3 deletions
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1
cfg.mk
View File

@ -764,6 +764,7 @@ sc_prohibit_cross_inclusion:
cpu/ | locking/ | network/ | rpc/ | security/) \
safe="($$dir|util|conf)";; \
xenapi/ | xenxs/ ) safe="($$dir|util|conf|xen)";; \
qemu/ ) safe="($$dir|util|conf|cpu|network|locking|rpc|security|storage)";; \
*) safe="($$dir|util|conf|cpu|network|locking|rpc|security)";; \
esac; \
in_vc_files="^src/$$dir" \

17
src/qemu/qemu_driver.c
View File

@ -94,6 +94,7 @@
#include "virstring.h"
#include "viraccessapicheck.h"
#include "viraccessapicheckqemu.h"
#include "storage/storage_driver.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
@ -12648,6 +12649,7 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver,
int ret = -1;
int fd = -1;
bool need_unlink = false;
virStorageFilePtr snapfile = NULL;
if (snap->snapshot != VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
@ -12667,6 +12669,9 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver,
virStorageFileFreeMetadata(disk->backingChain);
disk->backingChain = NULL;
if (!(snapfile = virStorageFileInitFromSnapshotDef(snap)))
goto cleanup;
switch (snap->type) {
case VIR_DOMAIN_DISK_TYPE_BLOCK:
reuse = true;
@ -12742,8 +12747,9 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver,
}
cleanup:
if (need_unlink && unlink(source))
if (need_unlink && virStorageFileUnlink(snapfile))
VIR_WARN("unable to unlink just-created %s", source);
virStorageFileFree(snapfile);
VIR_FREE(device);
VIR_FREE(source);
VIR_FREE(persistSource);
@ -12763,16 +12769,20 @@ qemuDomainSnapshotUndoSingleDiskActive(virQEMUDriverPtr driver,
{
char *source = NULL;
char *persistSource = NULL;
virStorageFilePtr diskfile = NULL;
struct stat st;
diskfile = virStorageFileInitFromDiskDef(disk);
if (VIR_STRDUP(source, origdisk->src) < 0 ||
(persistDisk && VIR_STRDUP(persistSource, source) < 0))
goto cleanup;
qemuDomainPrepareDiskChainElement(driver, vm, disk, disk->src,
VIR_DISK_CHAIN_NO_ACCESS);
if (need_unlink && stat(disk->src, &st) == 0 &&
S_ISREG(st.st_mode) && unlink(disk->src) < 0)
if (need_unlink && diskfile &&
virStorageFileStat(diskfile, &st) == 0 && S_ISREG(st.st_mode) &&
virStorageFileUnlink(diskfile) < 0)
VIR_WARN("Unable to remove just-created %s", disk->src);
/* Update vm in place to match changes. */
@ -12790,6 +12800,7 @@ qemuDomainSnapshotUndoSingleDiskActive(virQEMUDriverPtr driver,
}
cleanup:
virStorageFileFree(diskfile);
VIR_FREE(source);
VIR_FREE(persistSource);
}