From 3cf074ee40b4df4123732a1591aa3b4308e9c634 Mon Sep 17 00:00:00 2001 From: Peter Krempa Date: Mon, 25 Nov 2013 18:56:24 +0100 Subject: [PATCH] qemu: snapshot: Add support for external active snapshots on gluster Add support for gluster backed images as sources for snapshots in the qemu driver. This will also simplify adding further network backed volumes as sources for snapshot in case qemu will support them. --- docs/formatsnapshot.html.in | 5 +- src/qemu/qemu_command.c | 2 +- src/qemu/qemu_command.h | 9 +++ src/qemu/qemu_driver.c | 113 +++++++++++++++++++++++++++++++++--- 4 files changed, 119 insertions(+), 10 deletions(-) diff --git a/docs/formatsnapshot.html.in b/docs/formatsnapshot.html.in index 44ed4fdab0..1f9a6c68cf 100644 --- a/docs/formatsnapshot.html.in +++ b/docs/formatsnapshot.html.in @@ -183,8 +183,9 @@ documentation for further information. Libvirt currently supports the type element in the qemu - driver and supported values are file and - block (since 1.2.2). + driver and supported values are file, block + and network with a protocol of gluster + (since 1.2.2). diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index e9908f9e65..bb8756fd46 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -3822,7 +3822,7 @@ cleanup: } -static int +int qemuGetDriveSourceString(int type, const char *src, int protocol, diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h index 82ca4b30bf..ebb0b1d210 100644 --- a/src/qemu/qemu_command.h +++ b/src/qemu/qemu_command.h @@ -313,4 +313,13 @@ qemuParseKeywords(const char *str, int *retnkeywords, int allowEmptyValue); +int qemuGetDriveSourceString(int type, + const char *src, + int protocol, + size_t nhosts, + virDomainDiskHostDefPtr hosts, + const char *username, + const char *secret, + char **path); + #endif /* __QEMU_COMMAND_H__*/ diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 04cd13b5ff..6ea837ef04 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -11933,6 +11933,24 @@ cleanup: return ret; } + +static int +qemuDomainSnapshotDiskGetSourceString(virDomainSnapshotDiskDefPtr disk, + char **source) +{ + *source = NULL; + + return qemuGetDriveSourceString(virDomainSnapshotDiskGetActualType(disk), + disk->file, + disk->protocol, + disk->nhosts, + disk->hosts, + NULL, + NULL, + source); +} + + typedef enum { VIR_DISK_CHAIN_NO_ACCESS, VIR_DISK_CHAIN_READ_ONLY, @@ -12330,6 +12348,29 @@ qemuDomainSnapshotPrepareDiskExternalOverlayActive(virDomainSnapshotDiskDefPtr d return 0; case VIR_DOMAIN_DISK_TYPE_NETWORK: + switch ((enum virDomainDiskProtocol) disk->protocol) { + case VIR_DOMAIN_DISK_PROTOCOL_GLUSTER: + return 0; + + case VIR_DOMAIN_DISK_PROTOCOL_NBD: + case VIR_DOMAIN_DISK_PROTOCOL_RBD: + case VIR_DOMAIN_DISK_PROTOCOL_SHEEPDOG: + case VIR_DOMAIN_DISK_PROTOCOL_ISCSI: + case VIR_DOMAIN_DISK_PROTOCOL_HTTP: + case VIR_DOMAIN_DISK_PROTOCOL_HTTPS: + case VIR_DOMAIN_DISK_PROTOCOL_FTP: + case VIR_DOMAIN_DISK_PROTOCOL_FTPS: + case VIR_DOMAIN_DISK_PROTOCOL_TFTP: + case VIR_DOMAIN_DISK_PROTOCOL_LAST: + virReportError(VIR_ERR_INTERNAL_ERROR, + _("external active snapshots are not supported on " + "'network' disks using '%s' protocol"), + virDomainDiskProtocolTypeToString(disk->protocol)); + return -1; + + } + break; + case VIR_DOMAIN_DISK_TYPE_DIR: case VIR_DOMAIN_DISK_TYPE_VOLUME: case VIR_DOMAIN_DISK_TYPE_LAST: @@ -12637,6 +12678,9 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver, qemuDomainObjPrivatePtr priv = vm->privateData; char *device = NULL; char *source = NULL; + char *newsource = NULL; + virDomainDiskHostDefPtr newhosts = NULL; + virDomainDiskHostDefPtr persistHosts = NULL; int format = snap->format; const char *formatStr = NULL; char *persistSource = NULL; @@ -12651,8 +12695,7 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver, return -1; } - if (virAsprintf(&device, "drive-%s", disk->info.alias) < 0 || - (persistDisk && VIR_STRDUP(persistSource, source) < 0)) + if (virAsprintf(&device, "drive-%s", disk->info.alias) < 0) goto cleanup; /* XXX Here, we know we are about to alter disk->backingChain if @@ -12666,13 +12709,21 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver, if (!(snapfile = virStorageFileInitFromSnapshotDef(snap))) goto cleanup; + if (qemuDomainSnapshotDiskGetSourceString(snap, &source) < 0) + goto cleanup; + + if (VIR_STRDUP(newsource, snap->file) < 0) + goto cleanup; + + if (persistDisk && + VIR_STRDUP(persistSource, snap->file) < 0) + goto cleanup; + switch (snap->type) { case VIR_DOMAIN_DISK_TYPE_BLOCK: reuse = true; /* fallthrough */ case VIR_DOMAIN_DISK_TYPE_FILE: - if (VIR_STRDUP(source, snap->file) < 0) - goto cleanup; /* create the stub file and set selinux labels; manipulate disk in * place, in a way that can be reverted on failure. */ @@ -12692,6 +12743,27 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver, } break; + case VIR_DOMAIN_DISK_TYPE_NETWORK: + switch (snap->protocol) { + case VIR_DOMAIN_DISK_PROTOCOL_GLUSTER: + if (!(newhosts = virDomainDiskHostDefCopy(snap->nhosts, snap->hosts))) + goto cleanup; + + if (persistDisk && + !(persistHosts = virDomainDiskHostDefCopy(snap->nhosts, snap->hosts))) + goto cleanup; + + break; + + default: + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, + _("snapshots on volumes using '%s' protocol " + "are not supported"), + virDomainDiskProtocolTypeToString(snap->protocol)); + goto cleanup; + } + break; + default: virReportError(VIR_ERR_OPERATION_UNSUPPORTED, _("snapshots are not supported on '%s' volumes"), @@ -12727,17 +12799,33 @@ qemuDomainSnapshotCreateSingleDiskActive(virQEMUDriverPtr driver, /* Update vm in place to match changes. */ need_unlink = false; + VIR_FREE(disk->src); - disk->src = source; - source = NULL; + virDomainDiskHostDefFree(disk->nhosts, disk->hosts); + + disk->src = newsource; disk->format = format; disk->type = snap->type; + disk->protocol = snap->protocol; + disk->nhosts = snap->nhosts; + disk->hosts = newhosts; + + newsource = NULL; + newhosts = NULL; + if (persistDisk) { VIR_FREE(persistDisk->src); + virDomainDiskHostDefFree(persistDisk->nhosts, persistDisk->hosts); + persistDisk->src = persistSource; - persistSource = NULL; persistDisk->format = format; persistDisk->type = snap->type; + persistDisk->protocol = snap->protocol; + persistDisk->nhosts = snap->nhosts; + persistDisk->hosts = persistHosts; + + persistSource = NULL; + persistHosts = NULL; } cleanup: @@ -12746,7 +12834,10 @@ cleanup: virStorageFileFree(snapfile); VIR_FREE(device); VIR_FREE(source); + VIR_FREE(newsource); VIR_FREE(persistSource); + virDomainDiskHostDefFree(snap->nhosts, newhosts); + virDomainDiskHostDefFree(snap->nhosts, persistHosts); return ret; } @@ -12785,12 +12876,20 @@ qemuDomainSnapshotUndoSingleDiskActive(virQEMUDriverPtr driver, source = NULL; disk->format = origdisk->format; disk->type = origdisk->type; + disk->protocol = origdisk->protocol; + virDomainDiskHostDefFree(disk->nhosts, disk->hosts); + disk->nhosts = origdisk->nhosts; + disk->hosts = virDomainDiskHostDefCopy(origdisk->nhosts, origdisk->hosts); if (persistDisk) { VIR_FREE(persistDisk->src); persistDisk->src = persistSource; persistSource = NULL; persistDisk->format = origdisk->format; persistDisk->type = origdisk->type; + persistDisk->protocol = origdisk->protocol; + virDomainDiskHostDefFree(persistDisk->nhosts, persistDisk->hosts); + persistDisk->nhosts = origdisk->nhosts; + persistDisk->hosts = virDomainDiskHostDefCopy(origdisk->nhosts, origdisk->hosts); } cleanup: