mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-03-07 17:28:15 +00:00
qemu_block: extract block commit code to separate function
Signed-off-by: Pavel Hrdina <phrdina@redhat.com> Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Pavel Hrdina
parent
a1cbaee5c8
commit
f5a77198bf
@ -3196,3 +3196,180 @@ qemuBlockExportAddNBD(virDomainObj *vm,
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return qemuMonitorBlockExportAdd(priv->mon, &nbdprops);
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}
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int
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qemuBlockCommit(virDomainObj *vm,
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virDomainDiskDef *disk,
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virStorageSource *baseSource,
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virStorageSource *topSource,
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virStorageSource *top_parent,
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unsigned long bandwidth,
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unsigned int flags)
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{
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qemuDomainObjPrivate *priv = vm->privateData;
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virQEMUDriver *driver = priv->driver;
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int ret = -1;
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bool clean_access = false;
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g_autofree char *backingPath = NULL;
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qemuBlockJobData *job = NULL;
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g_autoptr(virStorageSource) mirror = NULL;
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if (virDomainObjCheckActive(vm) < 0)
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return -1;
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/* Convert bandwidth MiB to bytes, if necessary */
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if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_BANDWIDTH_BYTES)) {
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if (bandwidth > LLONG_MAX >> 20) {
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virReportError(VIR_ERR_OVERFLOW,
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_("bandwidth must be less than %llu"),
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LLONG_MAX >> 20);
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return -1;
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}
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bandwidth <<= 20;
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}
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if (!qemuDomainDiskBlockJobIsSupported(disk))
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return -1;
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if (virStorageSourceIsEmpty(disk->src)) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
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_("disk %s has no source file to be committed"),
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disk->dst);
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return -1;
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}
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if (qemuDomainDiskBlockJobIsActive(disk))
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return -1;
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if (qemuDomainSupportsCheckpointsBlockjobs(vm) < 0)
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return -1;
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if (topSource == disk->src) {
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/* XXX Should we auto-pivot when COMMIT_ACTIVE is not specified? */
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if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_ACTIVE)) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("commit of '%s' active layer requires active flag"),
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disk->dst);
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return -1;
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}
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} else if (flags & VIR_DOMAIN_BLOCK_COMMIT_ACTIVE) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("active commit requested but '%s' is not active"),
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topSource->path);
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return -1;
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}
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if (!virStorageSourceHasBacking(topSource)) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("top '%s' in chain for '%s' has no backing file"),
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topSource->path, disk->src->path);
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return -1;
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}
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if ((flags & VIR_DOMAIN_BLOCK_COMMIT_SHALLOW) &&
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baseSource != topSource->backingStore) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("base '%s' is not immediately below '%s' in chain "
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"for '%s'"),
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baseSource->path, topSource->path, disk->src->path);
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return -1;
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}
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/* For an active commit, clone enough of the base to act as the mirror */
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if (topSource == disk->src) {
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if (!(mirror = virStorageSourceCopy(baseSource, false)))
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return -1;
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if (virStorageSourceInitChainElement(mirror,
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disk->src,
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true) < 0)
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return -1;
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}
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if (flags & VIR_DOMAIN_BLOCK_COMMIT_RELATIVE &&
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topSource != disk->src) {
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if (top_parent &&
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qemuBlockUpdateRelativeBacking(vm, top_parent, disk->src) < 0)
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return -1;
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if (virStorageSourceGetRelativeBackingPath(topSource, baseSource,
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&backingPath) < 0)
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return -1;
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if (!backingPath) {
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virReportError(VIR_ERR_OPERATION_INVALID, "%s",
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_("can't keep relative backing relationship"));
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return -1;
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}
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}
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/* For the commit to succeed, we must allow qemu to open both the
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* 'base' image and the parent of 'top' as read/write; 'top' might
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* not have a parent, or might already be read-write. XXX It
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* would also be nice to revert 'base' to read-only, as well as
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* revoke access to files removed from the chain, when the commit
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* operation succeeds, but doing that requires tracking the
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* operation in XML across libvirtd restarts. */
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clean_access = true;
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if (qemuDomainStorageSourceAccessAllow(driver, vm, baseSource,
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false, false, false) < 0)
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goto cleanup;
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if (top_parent && top_parent != disk->src) {
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/* While top_parent is topmost image, we don't need to remember its
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* owner as it will be overwritten upon finishing the commit. Hence,
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* pass chainTop = false. */
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if (qemuDomainStorageSourceAccessAllow(driver, vm, top_parent,
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false, false, false) < 0)
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goto cleanup;
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}
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if (!(job = qemuBlockJobDiskNewCommit(vm, disk, top_parent, topSource,
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baseSource,
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flags & VIR_DOMAIN_BLOCK_COMMIT_DELETE,
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flags)))
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goto cleanup;
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disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_NONE;
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if (!backingPath && top_parent &&
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!(backingPath = qemuBlockGetBackingStoreString(baseSource, false)))
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goto cleanup;
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qemuDomainObjEnterMonitor(vm);
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ret = qemuMonitorBlockCommit(priv->mon,
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qemuDomainDiskGetTopNodename(disk),
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job->name,
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topSource->nodeformat,
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baseSource->nodeformat,
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backingPath, bandwidth);
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qemuDomainObjExitMonitor(vm);
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if (ret < 0)
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goto cleanup;
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if (mirror) {
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disk->mirror = g_steal_pointer(&mirror);
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disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_ACTIVE_COMMIT;
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}
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qemuBlockJobStarted(job, vm);
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cleanup:
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if (ret < 0 && clean_access) {
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virErrorPtr orig_err;
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virErrorPreserveLast(&orig_err);
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/* Revert access to read-only, if possible. */
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qemuDomainStorageSourceAccessAllow(driver, vm, baseSource,
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true, false, false);
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if (top_parent && top_parent != disk->src)
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qemuDomainStorageSourceAccessAllow(driver, vm, top_parent,
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true, false, false);
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virErrorRestore(&orig_err);
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}
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qemuBlockJobStartupFinalize(vm, job);
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return ret;
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}
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@ -276,3 +276,12 @@ qemuBlockExportAddNBD(virDomainObj *vm,
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const char *exportname,
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bool writable,
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const char *bitmap);
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int
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qemuBlockCommit(virDomainObj *vm,
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virDomainDiskDef *disk,
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virStorageSource *baseSource,
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virStorageSource *topSource,
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virStorageSource *top_parent,
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unsigned long bandwidth,
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unsigned int flags);
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@ -15109,19 +15109,12 @@ qemuDomainBlockCommit(virDomainPtr dom,
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unsigned long bandwidth,
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unsigned int flags)
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{
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virQEMUDriver *driver = dom->conn->privateData;
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qemuDomainObjPrivate *priv;
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virDomainObj *vm = NULL;
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int ret = -1;
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virDomainDiskDef *disk = NULL;
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virStorageSource *topSource;
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virStorageSource *baseSource = NULL;
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virStorageSource *top_parent = NULL;
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bool clean_access = false;
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g_autofree char *backingPath = NULL;
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unsigned long long speed = bandwidth;
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qemuBlockJobData *job = NULL;
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g_autoptr(virStorageSource) mirror = NULL;
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virCheckFlags(VIR_DOMAIN_BLOCK_COMMIT_SHALLOW |
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VIR_DOMAIN_BLOCK_COMMIT_ACTIVE |
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@ -15131,7 +15124,6 @@ qemuDomainBlockCommit(virDomainPtr dom,
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if (!(vm = qemuDomainObjFromDomain(dom)))
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goto cleanup;
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priv = vm->privateData;
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if (virDomainBlockCommitEnsureACL(dom->conn, vm->def) < 0)
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goto cleanup;
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@ -15139,176 +15131,24 @@ qemuDomainBlockCommit(virDomainPtr dom,
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if (virDomainObjBeginJob(vm, VIR_JOB_MODIFY) < 0)
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goto cleanup;
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if (virDomainObjCheckActive(vm) < 0)
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goto endjob;
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/* Convert bandwidth MiB to bytes, if necessary */
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if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_BANDWIDTH_BYTES)) {
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if (speed > LLONG_MAX >> 20) {
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virReportError(VIR_ERR_OVERFLOW,
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_("bandwidth must be less than %llu"),
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LLONG_MAX >> 20);
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goto endjob;
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}
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speed <<= 20;
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}
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if (!(disk = qemuDomainDiskByName(vm->def, path)))
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goto endjob;
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if (!qemuDomainDiskBlockJobIsSupported(disk))
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goto endjob;
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if (virStorageSourceIsEmpty(disk->src)) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
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_("disk %s has no source file to be committed"),
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disk->dst);
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goto endjob;
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}
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if (qemuDomainDiskBlockJobIsActive(disk))
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goto endjob;
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if (qemuDomainSupportsCheckpointsBlockjobs(vm) < 0)
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goto endjob;
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if (!top || STREQ(top, disk->dst))
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topSource = disk->src;
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else if (!(topSource = virStorageSourceChainLookup(disk->src, NULL, top,
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disk->dst, &top_parent)))
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goto endjob;
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if (topSource == disk->src) {
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/* XXX Should we auto-pivot when COMMIT_ACTIVE is not specified? */
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if (!(flags & VIR_DOMAIN_BLOCK_COMMIT_ACTIVE)) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("commit of '%s' active layer requires active flag"),
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disk->dst);
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goto endjob;
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}
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} else if (flags & VIR_DOMAIN_BLOCK_COMMIT_ACTIVE) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("active commit requested but '%s' is not active"),
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topSource->path);
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goto endjob;
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}
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if (!virStorageSourceHasBacking(topSource)) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("top '%s' in chain for '%s' has no backing file"),
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topSource->path, path);
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goto endjob;
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}
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if (!base && (flags & VIR_DOMAIN_BLOCK_COMMIT_SHALLOW))
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baseSource = topSource->backingStore;
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else if (!(baseSource = virStorageSourceChainLookup(disk->src, topSource,
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base, disk->dst, NULL)))
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goto endjob;
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if ((flags & VIR_DOMAIN_BLOCK_COMMIT_SHALLOW) &&
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baseSource != topSource->backingStore) {
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virReportError(VIR_ERR_INVALID_ARG,
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_("base '%s' is not immediately below '%s' in chain "
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"for '%s'"),
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base, topSource->path, path);
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goto endjob;
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}
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/* For an active commit, clone enough of the base to act as the mirror */
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if (topSource == disk->src) {
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if (!(mirror = virStorageSourceCopy(baseSource, false)))
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goto endjob;
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if (virStorageSourceInitChainElement(mirror,
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disk->src,
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true) < 0)
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goto endjob;
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}
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if (flags & VIR_DOMAIN_BLOCK_COMMIT_RELATIVE &&
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topSource != disk->src) {
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if (top_parent &&
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qemuBlockUpdateRelativeBacking(vm, top_parent, disk->src) < 0)
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goto endjob;
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if (virStorageSourceGetRelativeBackingPath(topSource, baseSource,
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&backingPath) < 0)
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goto endjob;
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if (!backingPath) {
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virReportError(VIR_ERR_OPERATION_INVALID, "%s",
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_("can't keep relative backing relationship"));
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goto endjob;
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}
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}
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/* For the commit to succeed, we must allow qemu to open both the
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* 'base' image and the parent of 'top' as read/write; 'top' might
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* not have a parent, or might already be read-write. XXX It
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* would also be nice to revert 'base' to read-only, as well as
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* revoke access to files removed from the chain, when the commit
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* operation succeeds, but doing that requires tracking the
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* operation in XML across libvirtd restarts. */
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clean_access = true;
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if (qemuDomainStorageSourceAccessAllow(driver, vm, baseSource,
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false, false, false) < 0)
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goto endjob;
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if (top_parent && top_parent != disk->src) {
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/* While top_parent is topmost image, we don't need to remember its
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* owner as it will be overwritten upon finishing the commit. Hence,
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* pass chainTop = false. */
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if (qemuDomainStorageSourceAccessAllow(driver, vm, top_parent,
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false, false, false) < 0)
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goto endjob;
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}
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if (!(job = qemuBlockJobDiskNewCommit(vm, disk, top_parent, topSource,
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baseSource,
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flags & VIR_DOMAIN_BLOCK_COMMIT_DELETE,
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flags)))
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goto endjob;
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disk->mirrorState = VIR_DOMAIN_DISK_MIRROR_STATE_NONE;
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if (!backingPath && top_parent &&
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!(backingPath = qemuBlockGetBackingStoreString(baseSource, false)))
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goto endjob;
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qemuDomainObjEnterMonitor(vm);
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ret = qemuMonitorBlockCommit(priv->mon,
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qemuDomainDiskGetTopNodename(disk),
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job->name,
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topSource->nodeformat,
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baseSource->nodeformat,
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backingPath, speed);
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qemuDomainObjExitMonitor(vm);
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if (ret < 0)
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goto endjob;
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if (mirror) {
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disk->mirror = g_steal_pointer(&mirror);
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disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_ACTIVE_COMMIT;
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}
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qemuBlockJobStarted(job, vm);
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ret = qemuBlockCommit(vm, disk, baseSource, topSource, top_parent, bandwidth, flags);
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endjob:
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if (ret < 0 && clean_access) {
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virErrorPtr orig_err;
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virErrorPreserveLast(&orig_err);
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/* Revert access to read-only, if possible. */
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qemuDomainStorageSourceAccessAllow(driver, vm, baseSource,
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true, false, false);
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if (top_parent && top_parent != disk->src)
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qemuDomainStorageSourceAccessAllow(driver, vm, top_parent,
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true, false, false);
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virErrorRestore(&orig_err);
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}
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qemuBlockJobStartupFinalize(vm, job);
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virDomainObjEndJob(vm);
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cleanup:
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