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blockjob: use stable disk string in job event

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When the block job event was first added, it was for block pull,
where the active layer of the disk remains the same name.  It was
also in a day where we only cared about local files, and so we
always had a canonical absolute file name.  But two things have
changed since then: we now have network disks, where determining
a single absolute string does not really make sense; and we have
two-phase jobs (copy and active commit) where the name of the
active layer changes between the first event (ready, on the old
name) and second (complete, on the pivoted name).

Adam Litke reported that having an unstable string between events
makes life harder for clients.  Furthermore, all of our API that
operate on a particular disk of a domain accept multiple strings:
not only the absolute name of the active layer, but also the
destination device name (such as 'vda').  As this latter name is
stable, even for network sources, it serves as a better string
to supply in block job events.

But backwards-compatibility demands that we should not change the
name handed to users unless they explicitly request it.  Therefore,
this patch adds a new event, BLOCK_JOB_2 (alas, I couldn't think of
any nicer name - but at least Migrate2 and Migrate3 are precedent
for a number suffix).  We must double up on emitting both old-style
and new-style events according to what clients have registered for
(see also how IOError and IOErrorReason emits double events, but
there the difference was a larger struct rather than changed
meaning of one of the struct members).

Unfortunately, adding a new event isn't something that can easily
be broken into pieces, so the commit is rather large.

* include/libvirt/libvirt.h.in (virDomainEventID): Add a new id
for VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2.
(virConnectDomainEventBlockJobCallback): Document new semantics.
* src/conf/domain_event.c (_virDomainEventBlockJob): Rename field,
to ensure we catch all clients.
(virDomainEventBlockJobNew): Add parameter.
(virDomainEventBlockJobDispose)
(virDomainEventBlockJobNewFromObj)
(virDomainEventBlockJobNewFromDom)
(virDomainEventDispatchDefaultFunc): Adjust clients.
(virDomainEventBlockJob2NewFromObj)
(virDomainEventBlockJob2NewFromDom): New functions.
* src/conf/domain_event.h: Add new prototypes.
* src/libvirt_private.syms (domain_event.h): Export new functions.
* src/qemu/qemu_driver.c (qemuDomainBlockJobImpl): Generate two
different events.
* src/qemu/qemu_process.c (qemuProcessHandleBlockJob): Likewise.
* src/remote/remote_protocol.x
(remote_domain_event_block_job_2_msg): New struct.
(REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2): New RPC.
* src/remote/remote_driver.c
(remoteDomainBuildEventBlockJob2): New handler.
(remoteEvents): Register new event.
* daemon/remote.c (remoteRelayDomainEventBlockJob2): New handler.
(domainEventCallbacks): Register new event.
* tools/virsh-domain.c (vshEventCallbacks): Likewise.
(vshEventBlockJobPrint): Adjust client.
* src/remote_protocol-structs: Regenerate.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2014-06-14 07:18:04 -06:00
parent 64b60266ad
commit 1bfe73a126
11 changed files with 176 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
daemon/remote.c
View File

@ -931,6 +931,44 @@ remoteRelayDomainEventDeviceRemoved(virConnectPtr conn,
}
static int
remoteRelayDomainEventBlockJob2(virConnectPtr conn,
virDomainPtr dom,
const char *dst,
int type,
int status,
void *opaque)
{
daemonClientEventCallbackPtr callback = opaque;
remote_domain_event_block_job_2_msg data;
if (callback->callbackID < 0 ||
!remoteRelayDomainEventCheckACL(callback->client, conn, dom))
return -1;
VIR_DEBUG("Relaying domain block job 2 event %s %d %s %i, %i, callback %d",
dom->name, dom->id, dst, type, status, callback->callbackID);
/* build return data */
memset(&data, 0, sizeof(data));
data.callbackID = callback->callbackID;
if (VIR_STRDUP(data.dst, dst) < 0)
goto error;
data.type = type;
data.status = status;
make_nonnull_domain(&data.dom, dom);
remoteDispatchObjectEventSend(callback->client, remoteProgram,
REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2,
(xdrproc_t)xdr_remote_domain_event_block_job_2_msg, &data);
return 0;
error:
VIR_FREE(data.dst);
return -1;
}
static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventLifecycle),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventReboot),
@ -948,6 +986,7 @@ static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventBalloonChange),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventPMSuspendDisk),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventDeviceRemoved),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventBlockJob2),
};
verify(ARRAY_CARDINALITY(domainEventCallbacks) == VIR_DOMAIN_EVENT_ID_LAST);

19
include/libvirt/libvirt.h.in
View File

@ -4852,13 +4852,25 @@ typedef enum {
* virConnectDomainEventBlockJobCallback:
* @conn: connection object
* @dom: domain on which the event occurred
* @disk: fully-qualified filename of the affected disk
* @disk: name associated with the affected disk (filename or target
* device, depending on how the callback was registered)
* @type: type of block job (virDomainBlockJobType)
* @status: status of the operation (virConnectDomainEventBlockJobStatus)
* @opaque: application specified data
*
* The callback signature to use when registering for an event of type
* VIR_DOMAIN_EVENT_ID_BLOCK_JOB with virConnectDomainEventRegisterAny()
* The string returned for @disk can be used in any of the libvirt API
* that operate on a particular disk of the domain, and depends on what
* event type was registered with virConnectDomainEventRegisterAny().
* If the callback was registered using the older type of
* VIR_DOMAIN_EVENT_ID_BLOCK_JOB, then @disk contains the absolute file
* name of the host resource for the active layer of the disk; however,
* this name is unstable (pivoting via block copy or active block commit
* will change which file is active, giving a different name for the two
* events associated with the same job) and cannot be relied on if the
* active layer is associated with a network resource. If the callback
* was registered using the newer type of VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2,
* then @disk will contain the device target shorthand (the <target
* dev='...'/> sub-element, such as "vda").
*/
typedef void (*virConnectDomainEventBlockJobCallback)(virConnectPtr conn,
virDomainPtr dom,
@ -5062,6 +5074,7 @@ typedef enum {
VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE = 13, /* virConnectDomainEventBalloonChangeCallback */
VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK = 14, /* virConnectDomainEventPMSuspendDiskCallback */
VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED = 15, /* virConnectDomainEventDeviceRemovedCallback */
VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2 = 16, /* virConnectDomainEventBlockJobCallback */
#ifdef VIR_ENUM_SENTINELS
VIR_DOMAIN_EVENT_ID_LAST

44
src/conf/domain_event.c
View File

@ -128,7 +128,7 @@ typedef virDomainEventIOError *virDomainEventIOErrorPtr;
struct _virDomainEventBlockJob {
virDomainEvent parent;
char *path;
char *disk; /* path or dst, depending on event id */
int type;
int status;
};
@ -364,7 +364,7 @@ virDomainEventBlockJobDispose(void *obj)
virDomainEventBlockJobPtr event = obj;
VIR_DEBUG("obj=%p", event);
VIR_FREE(event->path);
VIR_FREE(event->disk);
}
static void
@ -775,10 +775,11 @@ virDomainEventGraphicsNewFromObj(virDomainObjPtr obj,
}
static virObjectEventPtr
virDomainEventBlockJobNew(int id,
virDomainEventBlockJobNew(int event,
int id,
const char *name,
unsigned char *uuid,
const char *path,
const char *disk,
int type,
int status)
{
@ -788,11 +789,11 @@ virDomainEventBlockJobNew(int id,
return NULL;
if (!(ev = virDomainEventNew(virDomainEventBlockJobClass,
VIR_DOMAIN_EVENT_ID_BLOCK_JOB,
event,
id, name, uuid)))
return NULL;
if (VIR_STRDUP(ev->path, path) < 0) {
if (VIR_STRDUP(ev->disk, disk) < 0) {
virObjectUnref(ev);
return NULL;
}
@ -808,7 +809,8 @@ virDomainEventBlockJobNewFromObj(virDomainObjPtr obj,
int type,
int status)
{
return virDomainEventBlockJobNew(obj->def->id, obj->def->name,
return virDomainEventBlockJobNew(VIR_DOMAIN_EVENT_ID_BLOCK_JOB,
obj->def->id, obj->def->name,
obj->def->uuid, path, type, status);
}
@ -818,10 +820,33 @@ virDomainEventBlockJobNewFromDom(virDomainPtr dom,
int type,
int status)
{
return virDomainEventBlockJobNew(dom->id, dom->name, dom->uuid,
return virDomainEventBlockJobNew(VIR_DOMAIN_EVENT_ID_BLOCK_JOB,
dom->id, dom->name, dom->uuid,
path, type, status);
}
virObjectEventPtr
virDomainEventBlockJob2NewFromObj(virDomainObjPtr obj,
const char *dst,
int type,
int status)
{
return virDomainEventBlockJobNew(VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2,
obj->def->id, obj->def->name,
obj->def->uuid, dst, type, status);
}
virObjectEventPtr
virDomainEventBlockJob2NewFromDom(virDomainPtr dom,
const char *dst,
int type,
int status)
{
return virDomainEventBlockJobNew(VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2,
dom->id, dom->name, dom->uuid,
dst, type, status);
}
virObjectEventPtr
virDomainEventControlErrorNewFromDom(virDomainPtr dom)
{
@ -1250,12 +1275,13 @@ virDomainEventDispatchDefaultFunc(virConnectPtr conn,
goto cleanup;
case VIR_DOMAIN_EVENT_ID_BLOCK_JOB:
case VIR_DOMAIN_EVENT_ID_BLOCK_JOB_2:
{
virDomainEventBlockJobPtr blockJobEvent;
blockJobEvent = (virDomainEventBlockJobPtr)event;
((virConnectDomainEventBlockJobCallback)cb)(conn, dom,
blockJobEvent->path,
blockJobEvent->disk,
blockJobEvent->type,
blockJobEvent->status,
cbopaque);

11
src/conf/domain_event.h
View File

@ -126,6 +126,17 @@ virDomainEventBlockJobNewFromDom(virDomainPtr dom,
int type,
int status);
virObjectEventPtr
virDomainEventBlockJob2NewFromObj(virDomainObjPtr obj,
const char *dst,
int type,
int status);
virObjectEventPtr
virDomainEventBlockJob2NewFromDom(virDomainPtr dom,
const char *dst,
int type,
int status);
virObjectEventPtr
virDomainEventDiskChangeNewFromObj(virDomainObjPtr obj,
const char *oldSrcPath,

2
src/libvirt_private.syms
View File

@ -439,6 +439,8 @@ virDomainXMLOptionNew;
# conf/domain_event.h
virDomainEventBalloonChangeNewFromDom;
virDomainEventBalloonChangeNewFromObj;
virDomainEventBlockJob2NewFromDom;
virDomainEventBlockJob2NewFromObj;
virDomainEventBlockJobNewFromDom;
virDomainEventBlockJobNewFromObj;
virDomainEventControlErrorNewFromDom;

8
src/qemu/qemu_driver.c
View File

@ -15027,6 +15027,7 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm,
int ret = -1;
bool async = false;
virObjectEventPtr event = NULL;
virObjectEventPtr event2 = NULL;
int idx;
virDomainDiskDefPtr disk;
virStorageSourcePtr baseSource = NULL;
@ -15130,11 +15131,14 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm,
if (mode == BLOCK_JOB_ABORT) {
if (!async) {
/* Older qemu that lacked async reporting also lacked
* active commit, so we can hardcode the event to pull */
* active commit, so we can hardcode the event to pull.
* We have to generate two variants of the event. */
int type = VIR_DOMAIN_BLOCK_JOB_TYPE_PULL;
int status = VIR_DOMAIN_BLOCK_JOB_CANCELED;
event = virDomainEventBlockJobNewFromObj(vm, disk->src->path, type,
status);
event2 = virDomainEventBlockJob2NewFromObj(vm, disk->dst, type,
status);
} else if (!(flags & VIR_DOMAIN_BLOCK_JOB_ABORT_ASYNC)) {
while (1) {
/* Poll every 50ms */
@ -15178,6 +15182,8 @@ qemuDomainBlockJobImpl(virDomainObjPtr vm,
virObjectUnlock(vm);
if (event)
qemuDomainEventQueue(driver, event);
if (event2)
qemuDomainEventQueue(driver, event2);
return ret;
}

7
src/qemu/qemu_process.c
View File

@ -1013,6 +1013,7 @@ qemuProcessHandleBlockJob(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
{
virQEMUDriverPtr driver = opaque;
virObjectEventPtr event = NULL;
virObjectEventPtr event2 = NULL;
const char *path;
virDomainDiskDefPtr disk;
@ -1020,8 +1021,12 @@ qemuProcessHandleBlockJob(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
disk = qemuProcessFindDomainDiskByAlias(vm, diskAlias);
if (disk) {
/* Have to generate two variants of the event for old vs. new
* client callbacks */
path = virDomainDiskGetSource(disk);
event = virDomainEventBlockJobNewFromObj(vm, path, type, status);
event2 = virDomainEventBlockJob2NewFromObj(vm, disk->dst, type,
status);
/* XXX If we completed a block pull or commit, then recompute
* the cached backing chain to match. Better would be storing
* the chain ourselves rather than reprobing, but this
@ -1048,6 +1053,8 @@ qemuProcessHandleBlockJob(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
if (event)
qemuDomainEventQueue(driver, event);
if (event2)
qemuDomainEventQueue(driver, event2);
return 0;
}

31
src/remote/remote_driver.c
View File

@ -320,6 +320,11 @@ remoteDomainBuildEventCallbackDeviceRemoved(virNetClientProgramPtr prog,
virNetClientPtr client,
void *evdata, void *opaque);
static void
remoteDomainBuildEventBlockJob2(virNetClientProgramPtr prog,
virNetClientPtr client,
void *evdata, void *opaque);
static void
remoteNetworkBuildEventLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
virNetClientPtr client ATTRIBUTE_UNUSED,
@ -467,6 +472,10 @@ static virNetClientProgramEvent remoteEvents[] = {
remoteDomainBuildEventCallbackDeviceRemoved,
sizeof(remote_domain_event_callback_device_removed_msg),
(xdrproc_t)xdr_remote_domain_event_callback_device_removed_msg },
{ REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2,
remoteDomainBuildEventBlockJob2,
sizeof(remote_domain_event_block_job_2_msg),
(xdrproc_t)xdr_remote_domain_event_block_job_2_msg },
};
@ -5048,6 +5057,28 @@ remoteDomainBuildEventCallbackBlockJob(virNetClientProgramPtr prog ATTRIBUTE_UNU
remote_domain_event_callback_block_job_msg *msg = evdata;
remoteDomainBuildEventBlockJobHelper(conn, &msg->msg, msg->callbackID);
}
static void
remoteDomainBuildEventBlockJob2(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
virNetClientPtr client ATTRIBUTE_UNUSED,
void *evdata, void *opaque)
{
virConnectPtr conn = opaque;
remote_domain_event_block_job_2_msg *msg = evdata;
struct private_data *priv = conn->privateData;
virDomainPtr dom;
virObjectEventPtr event = NULL;
dom = get_nonnull_domain(conn, msg->dom);
if (!dom)
return;
event = virDomainEventBlockJob2NewFromDom(dom, msg->dst, msg->type,
msg->status);
virDomainFree(dom);
remoteEventQueue(priv, event, msg->callbackID);
}
static void
remoteDomainBuildEventGraphicsHelper(virConnectPtr conn,

16
src/remote/remote_protocol.x
View File

@ -2948,6 +2948,14 @@ struct remote_domain_event_callback_device_removed_msg {
remote_domain_event_device_removed_msg msg;
};
struct remote_domain_event_block_job_2_msg {
int callbackID;
remote_nonnull_domain dom;
remote_nonnull_string dst;
int type;
int status;
};
struct remote_connect_get_cpu_model_names_args {
remote_nonnull_string arch;
int need_results;
@ -5338,5 +5346,11 @@ enum remote_procedure {
* @generate: both
* @acl: domain:set_time
*/
REMOTE_PROC_DOMAIN_SET_TIME = 338
REMOTE_PROC_DOMAIN_SET_TIME = 338,
/**
* @generate: none
* @acl: none
*/
REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2 = 339
};

8
src/remote_protocol-structs
View File

@ -2413,6 +2413,13 @@ struct remote_domain_event_callback_device_removed_msg {
int callbackID;
remote_domain_event_device_removed_msg msg;
};
struct remote_domain_event_block_job_2_msg {
int callbackID;
remote_nonnull_domain dom;
remote_nonnull_string dst;
int type;
int status;
};
struct remote_connect_get_cpu_model_names_args {
remote_nonnull_string arch;
int need_results;
@ -2802,4 +2809,5 @@ enum remote_procedure {
REMOTE_PROC_DOMAIN_FSTHAW = 336,
REMOTE_PROC_DOMAIN_GET_TIME = 337,
REMOTE_PROC_DOMAIN_SET_TIME = 338,
REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB_2 = 339,
};

7
tools/virsh-domain.c
View File

@ -10921,8 +10921,9 @@ vshEventBlockJobPrint(virConnectPtr conn ATTRIBUTE_UNUSED,
if (!data->loop && *data->count)
return;
vshPrint(data->ctl, _("event 'block-job' for domain %s: %s for %s %s\n"),
virDomainGetName(dom), vshDomainBlockJobToString(type),
vshPrint(data->ctl, _("event '%s' for domain %s: %s for %s %s\n"),
data->cb->name, virDomainGetName(dom),
vshDomainBlockJobToString(type),
disk, vshDomainBlockJobStatusToString(status));
(*data->count)++;
if (!data->loop)
@ -11049,6 +11050,8 @@ static vshEventCallback vshEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(vshEventPMChangePrint), },
{ "device-removed",
VIR_DOMAIN_EVENT_CALLBACK(vshEventDeviceRemovedPrint), },
{ "block-job-2",
VIR_DOMAIN_EVENT_CALLBACK(vshEventBlockJobPrint), },
};
verify(VIR_DOMAIN_EVENT_ID_LAST == ARRAY_CARDINALITY(vshEventCallbacks));