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qemu: Make qemuDomainPrepareDiskChainElement aware of remote storage

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Refactor the function to accept a virStorageSourcePtr instead of just
the path, add a check to run it only on local storage and fix callers
(possibly by using a newly introduced wrapper that wraps a path in the
 virStorageSource struct for legacy code)
This commit is contained in:
Peter Krempa 2014-05-05 10:34:16 +02:00
parent b3e99ad8d6
commit b8d6ba9bdc
1 changed files with 49 additions and 28 deletions
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77
src/qemu/qemu_driver.c
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@ -12020,22 +12020,26 @@ static int
qemuDomainPrepareDiskChainElement(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDiskDefPtr disk,
const char *file,
virStorageSourcePtr elem,
qemuDomainDiskChainMode mode)
{
/* The easiest way to label a single file with the same
* permissions it would have as if part of the disk chain is to
* temporarily modify the disk in place. */
char *origsrc = disk->src.path;
int origformat = disk->src.format;
virStorageSourcePtr origchain = disk->src.backingStore;
virStorageSource origdisk;
bool origreadonly = disk->readonly;
virQEMUDriverConfigPtr cfg = NULL;
int ret = -1;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
disk->src.path = (char *) file; /* casting away const is safe here */
disk->src.format = VIR_STORAGE_FILE_RAW;
disk->src.backingStore = NULL;
/* XXX Labelling of non-local files isn't currently supported */
if (virStorageSourceGetActualType(&disk->src) == VIR_STORAGE_TYPE_NETWORK)
return 0;
cfg = virQEMUDriverGetConfig(driver);
/* XXX This would be easier when disk->src will be a pointer */
memcpy(&origdisk, &disk->src, sizeof(origdisk));
memcpy(&disk->src, elem, sizeof(*elem));
disk->readonly = mode == VIR_DISK_CHAIN_READ_ONLY;
if (mode == VIR_DISK_CHAIN_NO_ACCESS) {
@ -12058,9 +12062,7 @@ qemuDomainPrepareDiskChainElement(virQEMUDriverPtr driver,
ret = 0;
cleanup:
disk->src.path = origsrc;
disk->src.format = origformat;
disk->src.backingStore = origchain;
memcpy(&disk->src, &origdisk, sizeof(origdisk));
disk->readonly = origreadonly;
virObjectUnref(cfg);
return ret;
@ -12070,6 +12072,25 @@ qemuDomainPrepareDiskChainElement(virQEMUDriverPtr driver,
/* Return -1 if request is not sent to agent due to misconfig, -2 if request
* is sent but failed, and number of frozen filesystems on success. If -2 is
* returned, FSThaw should be called revert the quiesced status. */
static int
qemuDomainPrepareDiskChainElementPath(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDiskDefPtr disk,
const char *file,
qemuDomainDiskChainMode mode)
{
virStorageSource src;
memset(&src, 0, sizeof(src));
src.type = VIR_STORAGE_TYPE_FILE;
src.format = VIR_STORAGE_FILE_RAW;
src.path = (char *) file; /* casting away const is safe here */
return qemuDomainPrepareDiskChainElement(driver, vm, disk, &src, mode);
}
static int
qemuDomainSnapshotFSFreeze(virQEMUDriverPtr driver,
virDomainObjPtr vm,
@ -12829,9 +12850,9 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver,
VIR_FORCE_CLOSE(fd);
}
if (qemuDomainPrepareDiskChainElement(driver, vm, disk, source,
if (qemuDomainPrepareDiskChainElement(driver, vm, disk, &snap->src,
VIR_DISK_CHAIN_READ_WRITE) < 0) {
qemuDomainPrepareDiskChainElement(driver, vm, disk, source,
qemuDomainPrepareDiskChainElement(driver, vm, disk, &snap->src,
VIR_DISK_CHAIN_NO_ACCESS);
goto cleanup;
}
@ -12962,7 +12983,7 @@ qemuDomainSnapshotUndoSingleDiskActive(virQEMUDriverPtr driver,
(persistDisk && VIR_STRDUP(persistSource, source) < 0))
goto cleanup;
qemuDomainPrepareDiskChainElement(driver, vm, disk, disk->src.path,
qemuDomainPrepareDiskChainElement(driver, vm, disk, &disk->src,
VIR_DISK_CHAIN_NO_ACCESS);
if (need_unlink &&
virStorageFileStat(&disk->src, &st) == 0 && S_ISREG(st.st_mode) &&
@ -15276,10 +15297,10 @@ qemuDomainBlockCopy(virDomainObjPtr vm,
if (VIR_STRDUP(mirror, dest) < 0)
goto endjob;
if (qemuDomainPrepareDiskChainElement(driver, vm, disk, dest,
VIR_DISK_CHAIN_READ_WRITE) < 0) {
qemuDomainPrepareDiskChainElement(driver, vm, disk, dest,
VIR_DISK_CHAIN_NO_ACCESS);
if (qemuDomainPrepareDiskChainElementPath(driver, vm, disk, dest,
VIR_DISK_CHAIN_READ_WRITE) < 0) {
qemuDomainPrepareDiskChainElementPath(driver, vm, disk, dest,
VIR_DISK_CHAIN_NO_ACCESS);
goto endjob;
}
@ -15290,8 +15311,8 @@ qemuDomainBlockCopy(virDomainObjPtr vm,
virDomainAuditDisk(vm, NULL, dest, "mirror", ret >= 0);
qemuDomainObjExitMonitor(driver, vm);
if (ret < 0) {
qemuDomainPrepareDiskChainElement(driver, vm, disk, dest,
VIR_DISK_CHAIN_NO_ACCESS);
qemuDomainPrepareDiskChainElementPath(driver, vm, disk, dest,
VIR_DISK_CHAIN_NO_ACCESS);
goto endjob;
}
@ -15468,12 +15489,12 @@ qemuDomainBlockCommit(virDomainPtr dom,
* operation succeeds, but doing that requires tracking the
* operation in XML across libvirtd restarts. */
clean_access = true;
if (qemuDomainPrepareDiskChainElement(driver, vm, disk, baseSource->path,
if (qemuDomainPrepareDiskChainElement(driver, vm, disk, baseSource,
VIR_DISK_CHAIN_READ_WRITE) < 0 ||
(top_parent && top_parent != disk->src.path &&
qemuDomainPrepareDiskChainElement(driver, vm, disk,
top_parent,
VIR_DISK_CHAIN_READ_WRITE) < 0))
qemuDomainPrepareDiskChainElementPath(driver, vm, disk,
top_parent,
VIR_DISK_CHAIN_READ_WRITE) < 0))
goto endjob;
/* Start the commit operation. Pass the user's original spelling,
@ -15491,12 +15512,12 @@ qemuDomainBlockCommit(virDomainPtr dom,
endjob:
if (ret < 0 && clean_access) {
/* Revert access to read-only, if possible. */
qemuDomainPrepareDiskChainElement(driver, vm, disk, baseSource->path,
qemuDomainPrepareDiskChainElement(driver, vm, disk, baseSource,
VIR_DISK_CHAIN_READ_ONLY);
if (top_parent && top_parent != disk->src.path)
qemuDomainPrepareDiskChainElement(driver, vm, disk,
top_parent,
VIR_DISK_CHAIN_READ_ONLY);
qemuDomainPrepareDiskChainElementPath(driver, vm, disk,
top_parent,
VIR_DISK_CHAIN_READ_ONLY);
}
if (!qemuDomainObjEndJob(driver, vm))
vm = NULL;