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[libvirt] [PATCH] conf: fix use the wrong type for period
by Luyao Huang 16 Mar '15

16 Mar '15

https://bugzilla.redhat.com/show_bug.cgi?id=1140958 When we set period as unsigned int max value 4294967295 and start the vm, qemu will report error. This becuase we define period as a unsigned int and parse it as a unsigned int, but we use it as a int when set it via QMP in qemuMonitorJSONSetMemoryStatsPeriod, so 4294967295 turn to -1 when we send the QMP command. After check the qemu's code this value type should be int, and found a qemu commit 1f9296b for this values range. Seems no other hypervisor vm use this so i add a check when we parse it. Signed-off-by: Luyao Huang <lhuang(a)redhat.com> --- src/conf/domain_conf.c | 3 ++- src/conf/domain_conf.h | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 127fc91..54bd5aa 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -10452,7 +10452,8 @@ virDomainMemballoonDefParseXML(xmlNodePtr node, } ctxt->node = node; - if (virXPathUInt("string(./stats/@period)", ctxt, &def->period) < -1) { + if (virXPathInt("string(./stats/@period)", ctxt, &def->period) < -1 || + def->period < 0) { virReportError(VIR_ERR_XML_ERROR, "%s", _("invalid statistics collection period")); goto error; diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index ea463cb..ee0f5fd 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1556,7 +1556,7 @@ enum { struct _virDomainMemballoonDef { int model; virDomainDeviceInfo info; - unsigned int period; /* seconds between collections */ + int period; /* seconds between collections */ }; struct _virDomainNVRAMDef { -- 1.8.3.1

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[libvirt] [PATCH] virsh: fix report of non-active commit completion
by Eric Blake 15 Mar '15

15 Mar '15

Commit f182da20 (v1.2.6) caused a slight regression in virsh reporting of a non-active block job; where it used to state "Commit complete", it now states "Now in synchronized phase". But the synchronized phase is only possible for an active commit. For a reproducer, I created a chain 'a <- b <- c <- d <- e' and ran virsh blockcommit $dom vda --top c --base a --verbose --wait * tools/virsh-domain.c (cmdBlockCommit): Synchronized phase is only possible on active commits. Signed-off-by: Eric Blake <eblake(a)redhat.com> --- tools/virsh-domain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c index 1a364bb..b4e9cb0 100644 --- a/tools/virsh-domain.c +++ b/tools/virsh-domain.c @@ -2018,7 +2018,7 @@ cmdBlockCommit(vshControl *ctl, const vshCmd *cmd) vshPrint(ctl, "\n%s", _("Commit aborted")); else if (pivot) vshPrint(ctl, "\n%s", _("Successfully pivoted")); - else if (!finish) + else if (!finish && active) vshPrint(ctl, "\n%s", _("Now in synchronized phase")); else vshPrint(ctl, "\n%s", _("Commit complete")); -- 2.1.0

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[libvirt] [PATCH v3] util: don't fail if no PortData is found while getting migrateData
by zhang bo 14 Mar '15

14 Mar '15

Introduced by f6a2f97e Problem Description: After multiple times of migrating a domain, which has an ovs interface with no portData set, with non-shared disk, nbd ports got overflowed. The steps to reproduce the problem: 1 define and start a domain with its network configured as: <interface type='bridge'> <source bridge='br0'/> <virtualport type='openvswitch'> </virtualport> <model type='virtio'/> <driver name='vhost' queues='4'/> </interface> 2 do not set the network's portData. 3 migrate(ToURI2) it with flag 91(1011011), which means: VIR_MIGRATE_LIVE VIR_MIGRATE_PEER2PEER VIR_MIGRATE_PERSIST_DEST VIR_MIGRATE_UNDEFINE_SOURCE VIR_MIGRATE_NON_SHARED_DISK 4 migrate success, but we got an error log in libvirtd.log: error : virCommandWait:2423 : internal error: Child process (ovs-vsctl --timeout=5 get Interface vnet1 external_ids:PortData) unexpected exit status 1: ovs-vsctl: no key "PortData" in Interface record "vnet1" column external_ids 5 migrate it back, migrate it , migrate it back, ....... 6 nbd port got overflowed. The reasons for the problem is : 1 virNetDevOpenvswitchGetMigrateData() takes it as wrong if no portData is available for the ovs interface of a domain. (We think it's not appropriate, as portData is just OPTIONAL) 2 in func qemuMigrationBakeCookie(), it fails in qemuMigrationCookieAddNetwork(), and returns with -1. qemuMigrationCookieAddNBD() is not called thereafter, and mig->nbd is still NULL. 3 However, qemuMigrationRun() just *WARN* if qemuMigrationBakeCookie() fails, migration still successes. cookie is NULL, it's not baked on the src side. 4 On the destination side, it would alloc a port first and then free the nbd port in COOKIE. But the cookie is NULL due to qemuMigrationCookieAddNetwork() failure at src side. thus the nbd port is not freed. In this patch, we add "--if-exists" option to make ovs-vsctl not raise error if there's no portData available. Further more, because portData may be NULL in the cookie at the dest side, check it before setting portData. Signed-off-by: Zhou Yimin <zhouyimin(a)huawei.com> Signed-off-by: Zhang Bo <oscar.zhangbo(a)huawei.com> --- V1 here: https://www.redhat.com/archives/libvir-list/2015-February/msg00388.html V2: Add "--if-exists" option to ovs-vsctl cmd, making ovs-vsctl not raise error if there's no portData available. Suggested by Martin. We Tested the patch, it works. link: https://www.redhat.com/archives/libvir-list/2015-March/msg00104.html V3: move V1/V2/V3 description from above the patch to here. It did not show the detailed description above after apply PATCH v2. --- src/util/virnetdevopenvswitch.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/util/virnetdevopenvswitch.c b/src/util/virnetdevopenvswitch.c index e5c87bb..722d0dd 100644 --- a/src/util/virnetdevopenvswitch.c +++ b/src/util/virnetdevopenvswitch.c @@ -30,9 +30,12 @@ #include "virerror.h" #include "virmacaddr.h" #include "virstring.h" +#include "virlog.h" #define VIR_FROM_THIS VIR_FROM_NONE +VIR_LOG_INIT("util.netdevopenvswitch"); + /** * virNetDevOpenvswitchAddPort: * @brname: the bridge name @@ -206,7 +209,7 @@ int virNetDevOpenvswitchGetMigrateData(char **migrate, const char *ifname) virCommandPtr cmd = NULL; int ret = -1; - cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5", "get", "Interface", + cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5", "--if-exists", "get", "Interface", ifname, "external_ids:PortData", NULL); virCommandSetOutputBuffer(cmd, migrate); @@ -241,6 +244,12 @@ int virNetDevOpenvswitchSetMigrateData(char *migrate, const char *ifname) virCommandPtr cmd = NULL; int ret = -1; + if (!migrate) { + VIR_DEBUG("No OVS port data for interface %s", ifname); + return 0; + } + cmd = virCommandNewArgList(OVSVSCTL, "--timeout=5", "set", "Interface", ifname, NULL); virCommandAddArgFormat(cmd, "external_ids:PortData=%s", migrate); -- 1.7.12.4

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[libvirt] [PATCH] network: avoid memory leak of dnsmasq capabilities
by Eric Blake 14 Mar '15

14 Mar '15

Valgrind detected a leak: ==17820== 102 (56 direct, 46 indirect) bytes in 1 blocks are definitely lost in loss record 479 of 646 ==17820== at 0x4A08946: calloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==17820== by 0x508521A: virAllocVar (viralloc.c:560) ==17820== by 0x50D9FCA: virObjectNew (virobject.c:193) ==17820== by 0x50A4FD9: dnsmasqCapsNewEmpty (virdnsmasq.c:784) ==17820== by 0x50A514E: dnsmasqCapsNewFromBinary (virdnsmasq.c:830) ==17820== by 0x1B508287: networkStateInitialize (bridge_driver.c:666) It looks like commit 172acef introduced the problem, because networkGetDnsmasqCaps() increments the reference count but an early exit never does a matching decrement. * src/network/bridge_driver.c (networkStateCleanup): Plug leak. Signed-off-by: Eric Blake <eblake(a)redhat.com> --- src/network/bridge_driver.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c index 13e1717..a007388 100644 --- a/src/network/bridge_driver.c +++ b/src/network/bridge_driver.c @@ -391,8 +391,8 @@ networkUpdateState(virNetworkObjPtr obj, virObjectLock(obj); if (!virNetworkObjIsActive(obj)) { - virObjectUnlock(obj); - return 0; + ret = 0; + goto cleanup; } switch (obj->def->forward.type) { -- 2.1.0

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[libvirt] [PATCH] netdev: silence valgrind warning about ioctl use
by Eric Blake 14 Mar '15

14 Mar '15

Valgrind complained: ==3770== Syscall param ioctl(SIOCETHTOOL) points to uninitialised byte(s) ==3770== at 0x919D407: ioctl (syscall-template.S:81) ==3770== by 0x530FE7E: rpl_ioctl (ioctl.c:42) ==3770== by 0x50CB433: virNetDevFeatureAvailable (virnetdev.c:2764) ==3770== by 0x50CB6A7: virNetDevGetFeatures (virnetdev.c:2830) ==3770== by 0x1F0E5347: udevProcessNetworkInterface (node_device_udev.c:722) ==3770== by 0x1F0E689F: udevGetDeviceDetails (node_device_udev.c:1300) ==3770== by 0x1F0E6E06: udevAddOneDevice (node_device_udev.c:1422) ==3770== by 0x1F0E6FB8: udevProcessDeviceListEntry (node_device_udev.c:1464) ==3770== by 0x1F0E70CF: udevEnumerateDevices (node_device_udev.c:1494) ==3770== by 0x1F0E7BB4: nodeStateInitialize (node_device_udev.c:1806) ==3770== by 0x51B4303: virStateInitialize (libvirt.c:777) ==3770== by 0x11DEE7: daemonRunStateInit (libvirtd.c:906) ==3770== Address 0x228e38d4 is on thread 12's stack ==3770== in frame #2, created by virNetDevFeatureAvailable (virnetdev.c:2750) * src/util/virnetdev.c (virNetDevFeatureAvailable): Initialize all bytes of ifr. Signed-off-by: Eric Blake <eblake(a)redhat.com> --- src/util/virnetdev.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c index 093c99c..54d866e 100644 --- a/src/util/virnetdev.c +++ b/src/util/virnetdev.c @@ -2758,6 +2758,7 @@ virNetDevFeatureAvailable(const char *ifname, struct ethtool_value *cmd) goto cleanup; } + memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, ifname); ifr.ifr_data = (void*) cmd; -- 2.1.0

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[libvirt] [PATCH v4 0/7] Drop network driver lock
by Michal Privoznik 13 Mar '15

13 Mar '15

Hopefully, the last version. Again, some patches are ACKed already, but I'm sending them again. Not to trash the review bandwidth, but for reviewer to get better picture. Michal Privoznik (7): bridge_driver: Don't access global driver randomly network_driver: Use accessor for dnsmasqCaps struct _virNetworkDriverState: Annotate items bridge_driver: Drop networkDriverLock() from almost everywhere test_driver: Drop testDriverLock() from almost everywhere parallels_network: Drop parallelsDriverLock() from everywhere. bridge_driver: Use more of networkObjFromNetwork src/network/bridge_driver.c | 467 ++++++++++++++++++----------------- src/network/bridge_driver_platform.h | 7 + src/parallels/parallels_network.c | 33 +-- src/test/test_driver.c | 56 +---- 4 files changed, 255 insertions(+), 308 deletions(-) -- 2.0.5

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[libvirt] Applying for GSoC project 'Introducing job control to the storage driver' in libvirt
by Taowei Luo 13 Mar '15

13 Mar '15

Hello, everyone. I'm Taowei Luo. A participator in Google Summer of Code last year for the project rewriting vbox driver in libvirt. I am so glad that my project isn't found in this year's GSoC project list :) Having a nice experience last year, libvirt is my top option to join the GSoC 2015. And my interesting project is “Introducing job control to the storage driver”. I have read some materials about this project. Including I noticed that Tucker had attempted it last year. It seems he didn't make it through the final evaluation. During his working, some discussion were made in mail-list. It is really inspiring to me. So I have some basic ideas for now. The project requires job control functions (at least, reporting the progress) in storage driver. Obviously, it contains two part. First find codes that really do the storage work which may take a long period and can be asynchronized. Then, extract it to the job control part so make it under the control. It would not be hard to find codes that really need asynchronization. Maybe by dumping the debug message and tracing the function calls. So the big part is design the APIs for job control. I think the goal for API design is not only make it workable but also make it reasonable and extendable. To achieve this, a lot of details were discussed in last year's proceeding. I summered it and add my own opinion. Parallel jobs: The idea result is that several jobs work in parallel and libvirt monitors and controls it. There are two ways for parallel: thread and process. I prefer process. In process, we can easier implement the idea of *control* by signal. Process has better independence than thread. What's more, it is a low coupling design. Synchronization: process can use system level lock to make sure it obtain the resources. If the process can't obtain it could exit with failure (or wait). In process, we can leave most resource competition handling by OS. If thread is used instead, we need to think about resource competition between libvirt and other process, and at the same time, those competitions in libvirt thread. Management: We execute those asynchronous codes in a new process. In libvirt, it invokes those processes with parsed arguments. Libvirtd would have a process pool to store the pids and some attached information for each process. Signal would be used to communicate between process and libvirt. Expandability: Some other jobs like domain migration could be in implemented under this design. It's all about creating new jobs with parsed arguments, which tells the child process what to do and what resources they need. Privacy: If new jobs are created in process, user may access the process directly and not noticing libvirt. Function sigaction(), which provides the pid of sending process, could be used to register responding functions. Meanwhile, atexit() register functions that execute when the process is going to exit. It is helpful on notifying libvirtd the end of the job. What already have: Besides the discussion, some other resources would be helpful for this project. qemu has a prototype for job control in migration. We already have gnulib and tools in util/virprocess.h and util/virthread.h to achieve parallel. When undertaking, I would firstly implement the job control part. It would have some basic functions. Make one storage API work in it. Then, adding job control support for the rest APIs. This is all about what I came up with. Maybe those ideas are old and repeating. But I think it is a workable plan. Waiting for feedback. Regards, Taowei

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[libvirt] [PATCH 0/5] Allocate virtio-serial addresses
by Ján Tomko 13 Mar '15

13 Mar '15

Instead of simply incrementing the port, respect maximum port values and use multiple controllers. Ján Tomko (5): Add test for virtio serial port assignment Add functions to track virtio-serial addresses Allocate virtio-serial addresses when starting a domain Expand the address set when attaching a virtio-serial controller Assign an address when hotplugging a virtio-serial device src/conf/domain_addr.c | 382 +++++++++++++++++++++ src/conf/domain_addr.h | 45 +++ src/conf/domain_conf.c | 29 -- src/libvirt_private.syms | 8 + src/qemu/qemu_command.c | 63 ++++ src/qemu/qemu_domain.c | 1 + src/qemu/qemu_domain.h | 1 + src/qemu/qemu_hotplug.c | 32 +- src/qemu/qemu_process.c | 2 + tests/qemuhotplugtest.c | 2 +- .../qemuxml2argv-channel-virtio-auto.args | 8 +- .../qemuxml2argv-channel-virtio-autoassign.args | 20 ++ .../qemuxml2argv-channel-virtio-autoassign.xml | 50 +++ tests/qemuxml2argvtest.c | 2 + .../qemuxml2xmlout-channel-virtio-auto.xml | 10 +- 15 files changed, 614 insertions(+), 41 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-channel-virtio-autoassign.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-channel-virtio-autoassign.xml -- 2.0.5

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[libvirt] [PATCH v4 4/4] migration: Expose 'cancelling' status to user
by zhanghailiang 13 Mar '15

13 Mar '15

'cancelling' status was introduced by commit 51cf4c1a, mainly to avoid a possible start of a new migration process while the previous one still exists. But we didn't expose this status to user, instead we returned the 'active' state. Here, we expose it to the user (such as libvirt), 'cancelling' status only occurs for a short window before the migration aborts, so for users, if they cancel a migration process, it will observe 'cancelling' status occasionally. Testing revealed that with older libvirt (anything 1.2.13 or less) will print an odd error message if the state is seen, but that the migration is still properly cancelled. Newer libvirt will be patched to recognize the new state without the odd error message. Signed-off-by: zhanghailiang <zhang.zhanghailiang(a)huawei.com> Reviewed-by: Eric Blake <eblake(a)redhat.com> Cc: libvir-list(a)redhat.com --- migration/migration.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 035e005..a57928d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -179,13 +179,11 @@ MigrationInfo *qmp_query_migrate(Error **errp) break; case MIGRATION_STATUS_SETUP: info->has_status = true; - info->status = MIGRATION_STATUS_SETUP; info->has_total_time = false; break; case MIGRATION_STATUS_ACTIVE: case MIGRATION_STATUS_CANCELLING: info->has_status = true; - info->status = MIGRATION_STATUS_ACTIVE; info->has_total_time = true; info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - s->total_time; @@ -221,7 +219,6 @@ MigrationInfo *qmp_query_migrate(Error **errp) get_xbzrle_cache_stats(info); info->has_status = true; - info->status = MIGRATION_STATUS_COMPLETED; info->has_total_time = true; info->total_time = s->total_time; info->has_downtime = true; @@ -243,13 +240,12 @@ MigrationInfo *qmp_query_migrate(Error **errp) break; case MIGRATION_STATUS_FAILED: info->has_status = true; - info->status = MIGRATION_STATUS_FAILED; break; case MIGRATION_STATUS_CANCELLED: info->has_status = true; - info->status = MIGRATION_STATUS_CANCELLED; break; } + info->status = s->state; return info; } -- 1.7.12.4

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[libvirt] [PATCH v2] qemu: read backing chain names from qemu
by Eric Blake 13 Mar '15

13 Mar '15

https://bugzilla.redhat.com/show_bug.cgi?id=1199182 documents that after a series of disk snapshots into existing destination images, followed by active commits of the top image, it is possible for qemu 2.2 and earlier to end up tracking a different name for the image than what it would have had when opening the chain afresh. That is, when starting with the chain 'a <- b <- c', the name associated with 'b' is how it was spelled in the metadata of 'c', but when starting with 'a', taking two snapshots into 'a <- b <- c', then committing 'c' back into 'b', the name associated with 'b' is now the name used when taking the first snapshot. Sadly, older qemu doesn't know how to treat different spellings of the same filename as identical files (it uses strcmp() instead of checking for the same inode), which means libvirt's attempt to commit an image using solely the names learned from qcow2 metadata fails with a cryptic: error: internal error: unable to execute QEMU command 'block-commit': Top image file /tmp/images/c/../b/b not found even though the file exists. Trying to teach libvirt the rules on which name qemu will expect is not worth the effort (besides, we'd have to remember it across libvirtd restarts, and track whether a file was opened via metadata or via snapshot creation for a given qemu process); it is easier to just always directly ask qemu what string it expects to see in the first place. As a safety valve, we validate that any name returned by qemu still maps to the same local file as we have tracked it, so that a compromised qemu cannot accidentally cause us to act on an incorrect file. * src/qemu/qemu_monitor.h (qemuMonitorDiskNameLookup): New prototype. * src/qemu/qemu_monitor_json.h (qemuMonitorJSONDiskNameLookup): Likewise. * src/qemu/qemu_monitor.c (qemuMonitorDiskNameLookup): New function. * src/qemu/qemu_monitor_json.c (qemuMonitorJSONDiskNameLookup) (qemuMonitorJSONDiskNameLookupOne): Likewise. * src/qemu/qemu_driver.c (qemuDomainBlockCommit) (qemuDomainBlockJobImpl): Use it. Signed-off-by: Eric Blake <eblake(a)redhat.com> --- v2: as suggested by Dan, add a sanity checking valve to ensure we don't use qemu's string until vetting that it resolves to the same local name we are already tracking src/qemu/qemu_driver.c | 28 ++++++------- src/qemu/qemu_monitor.c | 20 ++++++++- src/qemu/qemu_monitor.h | 8 +++- src/qemu/qemu_monitor_json.c | 97 +++++++++++++++++++++++++++++++++++++++++++- src/qemu/qemu_monitor_json.h | 9 +++- 5 files changed, 144 insertions(+), 18 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index b3263ac..f0e530d 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -16132,9 +16132,6 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm, goto endjob; if (baseSource) { - if (qemuGetDriveSourceString(baseSource, NULL, &basePath) < 0) - goto endjob; - if (flags & VIR_DOMAIN_BLOCK_REBASE_RELATIVE) { if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_CHANGE_BACKING_FILE)) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", @@ -16172,8 +16169,12 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm, } qemuDomainObjEnterMonitor(driver, vm); - ret = qemuMonitorBlockJob(priv->mon, device, basePath, backingPath, - speed, mode, async); + if (baseSource) + basePath = qemuMonitorDiskNameLookup(priv->mon, device, disk->src, + baseSource); + if (!baseSource || basePath) + ret = qemuMonitorBlockJob(priv->mon, device, basePath, backingPath, + speed, mode, async); if (qemuDomainObjExitMonitor(driver, vm) < 0) ret = -1; if (ret < 0) { @@ -16903,12 +16904,6 @@ qemuDomainBlockCommit(virDomainPtr dom, VIR_DISK_CHAIN_READ_WRITE) < 0)) goto endjob; - if (qemuGetDriveSourceString(topSource, NULL, &topPath) < 0) - goto endjob; - - if (qemuGetDriveSourceString(baseSource, NULL, &basePath) < 0) - goto endjob; - if (flags & VIR_DOMAIN_BLOCK_COMMIT_RELATIVE && topSource != disk->src) { if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_CHANGE_BACKING_FILE)) { @@ -16939,9 +16934,14 @@ qemuDomainBlockCommit(virDomainPtr dom, disk->mirrorJob = VIR_DOMAIN_BLOCK_JOB_TYPE_ACTIVE_COMMIT; } qemuDomainObjEnterMonitor(driver, vm); - ret = qemuMonitorBlockCommit(priv->mon, device, - topPath, basePath, backingPath, - speed); + basePath = qemuMonitorDiskNameLookup(priv->mon, device, disk->src, + baseSource); + topPath = qemuMonitorDiskNameLookup(priv->mon, device, disk->src, + topSource); + if (basePath && topPath) + ret = qemuMonitorBlockCommit(priv->mon, device, + topPath, basePath, backingPath, + speed); if (qemuDomainObjExitMonitor(driver, vm) < 0) { ret = -1; goto endjob; diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c index d869a72..cf7dc5e 100644 --- a/src/qemu/qemu_monitor.c +++ b/src/qemu/qemu_monitor.c @@ -1,7 +1,7 @@ /* * qemu_monitor.c: interaction with QEMU monitor console * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -3458,6 +3458,24 @@ qemuMonitorSupportsActiveCommit(qemuMonitorPtr mon) } +/* Determine the name that qemu is using for tracking the backing + * element TARGET within the chain starting at TOP. */ +char * +qemuMonitorDiskNameLookup(qemuMonitorPtr mon, + const char *device, + virStorageSourcePtr top, + virStorageSourcePtr target) +{ + if (!mon->json) { + virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", + _("JSON monitor is required")); + return NULL; + } + + return qemuMonitorJSONDiskNameLookup(mon, device, top, target); +} + + /* Use the block-job-complete monitor command to pivot a block copy * job. */ int diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h index b30da34..e67d800 100644 --- a/src/qemu/qemu_monitor.h +++ b/src/qemu/qemu_monitor.h @@ -1,7 +1,7 @@ /* * qemu_monitor.h: interaction with QEMU monitor console * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -734,6 +734,12 @@ int qemuMonitorBlockCommit(qemuMonitorPtr mon, ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4); bool qemuMonitorSupportsActiveCommit(qemuMonitorPtr mon); +char *qemuMonitorDiskNameLookup(qemuMonitorPtr mon, + const char *device, + virStorageSourcePtr top, + virStorageSourcePtr target) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) + ATTRIBUTE_NONNULL(4); int qemuMonitorArbitraryCommand(qemuMonitorPtr mon, const char *cmd, diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index c16f3ca..522fd17 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -1,7 +1,7 @@ /* * qemu_monitor_json.c: interaction with QEMU monitor console * - * Copyright (C) 2006-2014 Red Hat, Inc. + * Copyright (C) 2006-2015 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -3883,6 +3883,101 @@ qemuMonitorJSONDrivePivot(qemuMonitorPtr mon, const char *device, } +static char * +qemuMonitorJSONDiskNameLookupOne(virJSONValuePtr image, + virStorageSourcePtr top, + virStorageSourcePtr target) +{ + virJSONValuePtr backing; + char *ret; + + if (!top) + return NULL; + if (top != target) { + backing = virJSONValueObjectGet(image, "backing-image"); + return qemuMonitorJSONDiskNameLookupOne(backing, top->backingStore, + target); + } + if (VIR_STRDUP(ret, virJSONValueObjectGetString(image, "filename")) < 0) + return NULL; + /* Sanity check - the name qemu gave us should resolve to the same + file tracked by our target description. */ + if (virStorageSourceIsLocalStorage(target) && + STRNEQ(ret, target->path) && + !virFileLinkPointsTo(ret, target->path)) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("qemu block name '%s' doesn't match expected '%s'"), + ret, target->path); + VIR_FREE(ret); + } + return ret; +} + + +char * +qemuMonitorJSONDiskNameLookup(qemuMonitorPtr mon, + const char *device, + virStorageSourcePtr top, + virStorageSourcePtr target) +{ + char *ret = NULL; + virJSONValuePtr cmd = NULL; + virJSONValuePtr reply = NULL; + virJSONValuePtr devices; + size_t i; + + cmd = qemuMonitorJSONMakeCommand("query-block", NULL); + if (!cmd) + return NULL; + if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0) + goto cleanup; + + devices = virJSONValueObjectGet(reply, "return"); + if (!devices || devices->type != VIR_JSON_TYPE_ARRAY) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("block info reply was missing device list")); + goto cleanup; + } + + for (i = 0; i < virJSONValueArraySize(devices); i++) { + virJSONValuePtr dev = virJSONValueArrayGet(devices, i); + virJSONValuePtr inserted; + virJSONValuePtr image; + const char *thisdev; + + if (!dev || dev->type != VIR_JSON_TYPE_OBJECT) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("block info device entry was not in expected format")); + goto cleanup; + } + + if ((thisdev = virJSONValueObjectGetString(dev, "device")) == NULL) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("block info device entry was not in expected format")); + goto cleanup; + } + + if (STREQ(thisdev, device)) { + if ((inserted = virJSONValueObjectGet(dev, "inserted")) && + (image = virJSONValueObjectGet(inserted, "image"))) { + ret = qemuMonitorJSONDiskNameLookupOne(image, top, target); + } + break; + } + } + if (!ret && !virGetLastError()) + virReportError(VIR_ERR_INTERNAL_ERROR, + _("unable to find backing name for device %s"), + device); + + cleanup: + virJSONValueFree(cmd); + virJSONValueFree(reply); + + return ret; +} + + int qemuMonitorJSONArbitraryCommand(qemuMonitorPtr mon, const char *cmd_str, char **reply_str, diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h index 8ceea8a..49392b6 100644 --- a/src/qemu/qemu_monitor_json.h +++ b/src/qemu/qemu_monitor_json.h @@ -1,7 +1,7 @@ /* * qemu_monitor_json.h: interaction with QEMU monitor console * - * Copyright (C) 2006-2009, 2011-2014 Red Hat, Inc. + * Copyright (C) 2006-2009, 2011-2015 Red Hat, Inc. * Copyright (C) 2006 Daniel P. Berrange * * This library is free software; you can redistribute it and/or @@ -277,6 +277,13 @@ int qemuMonitorJSONBlockCommit(qemuMonitorPtr mon, unsigned long long bandwidth) ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2); +char *qemuMonitorJSONDiskNameLookup(qemuMonitorPtr mon, + const char *device, + virStorageSourcePtr top, + virStorageSourcePtr target) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) + ATTRIBUTE_NONNULL(4); + int qemuMonitorJSONArbitraryCommand(qemuMonitorPtr mon, const char *cmd_str, char **reply_str, -- 2.1.0

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