Re: [libvirt] [PATCH v1 2/2] help to create disk images of non-shared migration

ping ...

在 2012-11-15四的 10:04 +0800，liguang写道： > try to do non-shared migration without bothering to > create disk images at target by hand. > > consider this situation: > 1. non-shared migration > virsh migrate --copy-storage-all ... > 2. migration fails > 3. create disk images required > qemu-img create ... > 4 migration run smoothly > so, try do remove step 2, 3, 4 > > this kind of usage had been discussed before, > http://www.redhat.com/archives/libvir-list/2011-December/msg00451.html > > this patch depends on my support offline migration patch: > https://www.redhat.com/archives/libvir-list/2012-November/msg00512.html > > Signed-off-by: liguang <lig.fnst(a)cn.fujitsu.com&gt; > --- > src/qemu/qemu_migration.c | 285 ++++++++++++++++++++++++++++++++++++++++++++- > 1 files changed, 284 insertions(+), 1 deletions(-) > > diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c > index 54359c3..9e7ee4f 100644 > --- a/src/qemu/qemu_migration.c > +++ b/src/qemu/qemu_migration.c > @@ -50,6 +50,7 @@ > #include "storage_file.h" > #include "viruri.h" > #include "hooks.h" > +#include "dirname.h" > > > #define VIR_FROM_THIS VIR_FROM_QEMU > @@ -72,6 +73,7 @@ enum qemuMigrationCookieFlags { > QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE, > QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT, > QEMU_MIGRATION_COOKIE_FLAG_NETWORK, > + QEMU_MIGRATION_COOKIE_FLAG_COPYSTORAGE, > > QEMU_MIGRATION_COOKIE_FLAG_LAST > }; > @@ -79,13 +81,14 @@ enum qemuMigrationCookieFlags { > VIR_ENUM_DECL(qemuMigrationCookieFlag); > VIR_ENUM_IMPL(qemuMigrationCookieFlag, > QEMU_MIGRATION_COOKIE_FLAG_LAST, > - "graphics", "lockstate", "persistent", "network"); > + "graphics", "lockstate", "persistent", "network", "storage"); > > enum qemuMigrationCookieFeatures { > QEMU_MIGRATION_COOKIE_GRAPHICS = (1 << QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS), > QEMU_MIGRATION_COOKIE_LOCKSTATE = (1 << QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE), > QEMU_MIGRATION_COOKIE_PERSISTENT = (1 << QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT), > QEMU_MIGRATION_COOKIE_NETWORK = (1 << QEMU_MIGRATION_COOKIE_FLAG_NETWORK), > + QEMU_MIGRATION_COOKIE_COPYSTORAGE = (1 << QEMU_MIGRATION_COOKIE_FLAG_COPYSTORAGE), > }; > > typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics; > @@ -119,6 +122,19 @@ struct _qemuMigrationCookieNetwork { > qemuMigrationCookieNetDataPtr net; > }; > > +typedef struct _qemuMigrationCookieStorageData qemuMigrationCookieStorageData; > +typedef qemuMigrationCookieStorageData *qemuMigrationCookieStorageDataPtr; > +struct _qemuMigrationCookieStorageData { > + char *dsize; > +}; > + > +typedef struct _qemuMigrationCookieStorage qemuMigrationCookieStorage; > +typedef qemuMigrationCookieStorage *qemuMigrationCookieStoragePtr; > +struct _qemuMigrationCookieStorage { > + int ndisks; > + qemuMigrationCookieStorageDataPtr disk; > +}; > + > typedef struct _qemuMigrationCookie qemuMigrationCookie; > typedef qemuMigrationCookie *qemuMigrationCookiePtr; > struct _qemuMigrationCookie { > @@ -147,6 +163,9 @@ struct _qemuMigrationCookie { > > /* If (flags & QEMU_MIGRATION_COOKIE_NETWORK) */ > qemuMigrationCookieNetworkPtr network; > + > + /* If (flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE) */ > + qemuMigrationCookieStoragePtr storage; > }; > > static void qemuMigrationCookieGraphicsFree(qemuMigrationCookieGraphicsPtr grap) > @@ -175,6 +194,21 @@ qemuMigrationCookieNetworkFree(qemuMigrationCookieNetworkPtr network) > VIR_FREE(network); > } > > +static void > +qemuMigrationCookieStorageFree(qemuMigrationCookieStoragePtr storage) > +{ > + int i; > + > + if (!storage) > + return; > + > + if (storage->disk) { > + for (i = 0; i < storage->ndisks; i++) > + VIR_FREE(storage->disk[i].dsize); > + } > + VIR_FREE(storage->disk); > + VIR_FREE(storage); > +} > > static void qemuMigrationCookieFree(qemuMigrationCookiePtr mig) > { > @@ -187,6 +221,9 @@ static void qemuMigrationCookieFree(qemuMigrationCookiePtr mig) > if (mig->flags & QEMU_MIGRATION_COOKIE_NETWORK) > qemuMigrationCookieNetworkFree(mig->network); > > + if (mig->flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE) > + qemuMigrationCookieStorageFree(mig->storage); > + > VIR_FREE(mig->localHostname); > VIR_FREE(mig->remoteHostname); > VIR_FREE(mig->name); > @@ -356,6 +393,64 @@ error: > return NULL; > } > > +static qemuMigrationCookieStoragePtr > +qemuMigrationCookieStorageAlloc(struct qemud_driver *driver, > + virDomainDefPtr def) > +{ > + int i, exitstatus; > + char *info = NULL, *start, *end, *tmp = NULL; > + virCommandPtr cmd = NULL; > + qemuMigrationCookieStoragePtr mig; > + > + if (VIR_ALLOC(mig) < 0) > + goto no_memory; > + > + if (VIR_ALLOC_N(mig->disk, def->ndisks) < 0) > + goto no_memory; > + if (!driver->qemuImgTool) { > + virReportError(VIR_ERR_INTERNAL_ERROR, > + "%s", _("unable to find kvm-img or qemu-img")); > + goto error; > + } > + mig->ndisks = def->ndisks; > + > + for (i = 0; i < mig->ndisks; i++) { > + cmd = virCommandNewArgList(driver->qemuImgTool, "info", > + def->disks[i]->src, NULL); > + virCommandAddEnvString(cmd, "LC_ALL=C"); > + virCommandSetOutputBuffer(cmd, &info); > + virCommandClearCaps(cmd); > + if (virCommandRun(cmd, &exitstatus) < 0) > + goto error; > + if ((start = strstr(info, "virtual size: ")) == NULL || > + ((end = strstr(start, "\n")) == NULL)) { > + virReportError(VIR_ERR_INTERNAL_ERROR, > + _("unable to parse qemu-img output '%s'"), > + info); > + goto error; > + } > + if ((tmp = strstr(start, " (")) && tmp < end) > + end = tmp; > + start += strlen("virtual size: "); > + if (start >= end) > + goto error; > + if (!(mig->disk[i].dsize = strndup(start, end-start))) > + goto error; > + VIR_FREE(info); > + virCommandFree(cmd); > + } > + > + return mig; > + > +no_memory: > + virReportOOMError(); > +error: > + virCommandFree(cmd); > + VIR_FREE(info); > + qemuMigrationCookieStorageFree(mig); > + return NULL; > +} > + > static qemuMigrationCookiePtr > qemuMigrationCookieNew(virDomainObjPtr dom) > { > @@ -491,6 +586,25 @@ qemuMigrationCookieAddNetwork(qemuMigrationCookiePtr mig, > return 0; > } > > +static int qemuMigrationCookieAddStorage(qemuMigrationCookiePtr mig, > + struct qemud_driver *driver, > + virDomainObjPtr dom) > +{ > + if (mig->flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE) { > + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", > + _("migration storage data already present")); > + return -1; > + } > + > + if (dom->def->ndisks > 0) { > + mig->storage = qemuMigrationCookieStorageAlloc(driver, dom->def); > + if (!mig->storage) > + return -1; > + mig->flags |= QEMU_MIGRATION_COOKIE_COPYSTORAGE; > + } > + > + return 0; > +} > > static void qemuMigrationCookieGraphicsXMLFormat(virBufferPtr buf, > qemuMigrationCookieGraphicsPtr grap) > @@ -540,6 +654,19 @@ qemuMigrationCookieNetworkXMLFormat(virBufferPtr buf, > virBufferAddLit(buf, " </network>\n"); > } > > +static void > +qemuMigrationCookieStorageXMLFormat(virBufferPtr buf, > + qemuMigrationCookieStoragePtr dsz) > +{ > + int i = 0; > + > + for (i = 0; i < dsz->ndisks; i++) { > + char *dsize = dsz->disk[i].dsize; > + virBufferAsprintf(buf, " <copystorage>\n"); > + virBufferAsprintf(buf, " <disksize>%s</disksize>\n", dsize); > + virBufferAddLit(buf, " </copystorage>\n"); > + } > +} > > static int > qemuMigrationCookieXMLFormat(struct qemud_driver *driver, > @@ -594,6 +721,9 @@ qemuMigrationCookieXMLFormat(struct qemud_driver *driver, > if ((mig->flags & QEMU_MIGRATION_COOKIE_NETWORK) && mig->network) > qemuMigrationCookieNetworkXMLFormat(buf, mig->network); > > + if ((mig->flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE) && mig->storage) > + qemuMigrationCookieStorageXMLFormat(buf, mig->storage); > + > virBufferAddLit(buf, "</qemu-migration>\n"); > return 0; > } > @@ -722,6 +852,44 @@ error: > goto cleanup; > } > > +static qemuMigrationCookieStoragePtr > +qemuMigrationCookieStorageXMLParse(xmlXPathContextPtr ctxt) > +{ > + qemuMigrationCookieStoragePtr dsz; > + int i, n; > + xmlNodePtr *storage = NULL; > + > + if (VIR_ALLOC(dsz) < 0) > + goto no_memory; > + > + if ((n = virXPathNodeSet("./copystorage", ctxt, &storage)) < 0) { > + virReportError(VIR_ERR_INTERNAL_ERROR, > + "%s", _("missing storage information")); > + goto error; > + } > + > + dsz->ndisks = n; > + if (VIR_ALLOC_N(dsz->disk, dsz->ndisks) < 0) > + goto no_memory; > + > + for (i = 0; i < dsz->ndisks; i++) { > + ctxt->node = storage[i]; > + if (!(dsz->disk[i].dsize = virXPathString("string(./disksize[1])", ctxt))) > + virReportError(VIR_ERR_INTERNAL_ERROR, > + "%s", _("missing tlsPort attribute in migration data")); > + } > + > +cleanup: > + VIR_FREE(storage); > + return dsz; > + > +no_memory: > + virReportOOMError(); > +error: > + qemuMigrationCookieStorageFree(dsz); > + dsz = NULL; > + goto cleanup; > +} > > static int > qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig, > @@ -874,6 +1042,11 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig, > (!(mig->network = qemuMigrationCookieNetworkXMLParse(ctxt)))) > goto error; > > + if ((flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE) && > + virXPathBoolean("count(./copystorage) > 0", ctxt) && > + (!(mig->storage = qemuMigrationCookieStorageXMLParse(ctxt)))) > + goto error; > + > return 0; > > error: > @@ -938,6 +1111,11 @@ qemuMigrationBakeCookie(qemuMigrationCookiePtr mig, > return -1; > } > > + if (flags & QEMU_MIGRATION_COOKIE_COPYSTORAGE && > + qemuMigrationCookieAddStorage(mig, driver, dom) < 0) { > + return -1; > + } > + > if (!(*cookieout = qemuMigrationCookieXMLFormatStr(driver, mig))) > return -1; > > @@ -1443,6 +1621,11 @@ char *qemuMigrationBegin(struct qemud_driver *driver, > QEMU_MIGRATION_COOKIE_LOCKSTATE) < 0) > goto cleanup; > > + if (qemuMigrationBakeCookie(mig, driver, vm, > + cookieout, cookieoutlen, > + QEMU_MIGRATION_COOKIE_COPYSTORAGE) < 0) > + goto cleanup; > + > if (flags & VIR_MIGRATE_OFFLINE) { > if (flags & (VIR_MIGRATE_NON_SHARED_DISK| > VIR_MIGRATE_NON_SHARED_INC)) { > @@ -1484,6 +1667,91 @@ cleanup: > } > > > +/* > + if gen is true, find out disk images migration required, > + so try to generate them at target, > + if gen is false, delete disk images generated before. > +*/ > +static int qemuMigrationHandleDiskFiles(struct qemud_driver *driver, > + virDomainDefPtr def, bool gen, > + qemuMigrationCookiePtr mig) > +{ > + char *tmp_dir = NULL, *outbuf = NULL; > + const char *img_tool = driver->qemuImgTool; > + const char *disk_format[] = {"none", "raw", "none", "none", "none", > + "cow", "none", "none", "qcow", "qcow2", > + "qed", "vmdk", "vpc","none", "none" > + }; > + virCommandPtr cmd = NULL; > + int i, ret = -1; > + > + if (!def->ndisks) > + return 0; > + > + if (img_tool == NULL) { > + virReportError(VIR_ERR_INTERNAL_ERROR, > + "%s", _("unable to find kvm-img or qemu-img")); > + goto error; > + } > + > + for (i = 0; i < def->ndisks; i++) { > + if (STRNEQ(def->disks[i]->driverName, "qemu")) > + continue; > + if (def->disks[i]->src == NULL) > + continue; > + if (virFileExists(def->disks[i]->src) && gen) > + continue; > + if (!gen && !virFileExists(def->disks[i]->src)) > + continue; > + if ((tmp_dir = mdir_name(def->disks[i]->src)) == NULL) > + continue; > + if (!virFileExists(tmp_dir)) > + if (virFileMakePath(tmp_dir) < 0) > + continue; > + if (STREQ(disk_format[def->disks[i]->format], "none")) > + continue; > + if (def->disks[i]->format < VIR_STORAGE_FILE_RAW) > + goto error; > + if (def->disks[i]->format >= VIR_STORAGE_FILE_LAST) > + goto error; > + > + if (gen) { > + char *dsize = mig->storage->disk[i].dsize; > + cmd = virCommandNewArgList(img_tool, "create", "-f", > + disk_format[def->disks[i]->format], > + def->disks[i]->src, NULL); > + virCommandAddArgFormat(cmd, "%s", dsize); > + if (def->disks[i]->encryption) > + virCommandAddArgList(cmd, "-o", "encryption=on", NULL); > + virCommandSetOutputBuffer(cmd, &outbuf); > + if (virCommandRun(cmd, NULL) < 0) { > + virReportSystemError(errno, "%s", outbuf); > + goto cleanup; > + } > + } else { > + if (unlink(def->disks[i]->src) < 0) { > + virReportError(errno, "%s", _("fail to unlink disk image file")); > + goto cleanup; > + } > + } > + virCommandFree(cmd); > + VIR_FREE(tmp_dir); > + VIR_FREE(outbuf); > + } > + > + ret = 0; > + > +cleanup: > + if (ret < 0) { > + virCommandFree(cmd); > + VIR_FREE(tmp_dir); > + VIR_FREE(outbuf); > + } > +error: > + return ret; > +} > + > + > /* Prepare is the first step, and it runs on the destination host. > */ > > @@ -1599,6 +1867,15 @@ qemuMigrationPrepareAny(struct qemud_driver *driver, > /* virDomainAssignDef already set the error */ > goto cleanup; > } > + > + if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, > + QEMU_MIGRATION_COOKIE_COPYSTORAGE))) > + goto cleanup; > + > + if (flags & (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC)) > + if (qemuMigrationHandleDiskFiles(driver, def, true, mig) < 0) > + goto endjob; > + > def = NULL; > priv = vm->privateData; > priv->origname = origname; > @@ -3250,6 +3527,7 @@ qemuMigrationFinish(struct qemud_driver *driver, > virErrorPtr orig_err = NULL; > int cookie_flags = 0; > qemuDomainObjPrivatePtr priv = vm->privateData; > + bool migration_status = false; > > VIR_DEBUG("driver=%p, dconn=%p, vm=%p, cookiein=%s, cookieinlen=%d, " > "cookieout=%p, cookieoutlen=%p, flags=%lx, retcode=%d", > @@ -3415,7 +3693,12 @@ qemuMigrationFinish(struct qemud_driver *driver, > if (qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen, 0) < 0) > VIR_WARN("Unable to encode migration cookie"); > > + migration_status = true; > + > endjob: > + if (!migration_status && flags & > + (VIR_MIGRATE_NON_SHARED_DISK | VIR_MIGRATE_NON_SHARED_INC)) > + qemuMigrationHandleDiskFiles(driver, vm->def, false, NULL); > if (qemuMigrationJobFinish(driver, vm) == 0) { > vm = NULL; > } else if (!vm->persistent && !virDomainObjIsActive(vm)) { -- li guang lig.fnst(a)cn.fujitsu.com linux kernel team at FNST, china -- libvir-list mailing list libvir-list(a)redhat.com https://www.redhat.com/mailman/listinfo/libvir-list