libvirt/src/parallels/parallels_utils.h

129 lines
4.6 KiB
C
Raw Normal View History

/*
* parallels_utils.h: core driver functions for managing
* Parallels Cloud Server hosts
*
* Copyright (C) 2012 Parallels, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#ifndef PARALLELS_UTILS_H
# define PARALLELS_UTILS_H
# include <Parallels.h>
# include "driver.h"
# include "conf/domain_conf.h"
# include "conf/storage_conf.h"
# include "conf/domain_event.h"
# include "conf/network_conf.h"
# include "virthread.h"
2012-12-12 17:53:50 +00:00
# include "virjson.h"
# define parallelsParseError() \
virReportErrorHelper(VIR_FROM_TEST, VIR_ERR_OPERATION_FAILED, __FILE__, \
__FUNCTION__, __LINE__, _("Can't parse prlctl output"))
# define IS_CT(def) (def->os.type == VIR_DOMAIN_OSTYPE_EXE)
# define parallelsDomNotFoundError(domain) \
do { \
char uuidstr[VIR_UUID_STRING_BUFLEN]; \
virUUIDFormat(domain->uuid, uuidstr); \
virReportError(VIR_ERR_NO_DOMAIN, \
_("no domain with matching uuid '%s'"), uuidstr); \
} while (0)
# define PARALLELS_DOMAIN_ROUTED_NETWORK_NAME "Routed"
# define PARALLELS_DOMAIN_BRIDGED_NETWORK_NAME "Bridged"
# define PARALLELS_REQUIRED_HOSTONLY_NETWORK "Host-Only"
# define PARALLELS_HOSTONLY_NETWORK_TYPE "host-only"
# define PARALLELS_REQUIRED_BRIDGED_NETWORK "Bridged"
# define PARALLELS_BRIDGED_NETWORK_TYPE "bridged"
struct _parallelsConn {
virMutex lock;
/* Immutable pointer, self-locking APIs */
virDomainObjListPtr domains;
PRL_HANDLE server;
virStoragePoolObjList pools;
virNetworkObjListPtr networks;
virCapsPtr caps;
virDomainXMLOptionPtr xmlopt;
virObjectEventStatePtr domainEventState;
virStorageDriverStatePtr storageState;
const char *drivername;
};
typedef struct _parallelsConn parallelsConn;
typedef struct _parallelsConn *parallelsConnPtr;
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
struct _parallelsCountersCache {
PRL_HANDLE stats;
virCond cond;
// -1 - unsubscribed
// > -1 - subscribed
int count;
};
typedef struct _parallelsCountersCache parallelsCountersCache;
struct parallelsDomObj {
int id;
char *uuid;
char *home;
PRL_HANDLE sdkdom;
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
parallelsCountersCache cache;
};
typedef struct parallelsDomObj *parallelsDomObjPtr;
virDrvOpenStatus parallelsStorageOpen(virConnectPtr conn, unsigned int flags);
int parallelsStorageClose(virConnectPtr conn);
extern virStorageDriver parallelsStorageDriver;
virDrvOpenStatus parallelsNetworkOpen(virConnectPtr conn, unsigned int flags);
int parallelsNetworkClose(virConnectPtr conn);
extern virNetworkDriver parallelsNetworkDriver;
virDomainObjPtr parallelsDomObjFromDomain(virDomainPtr domain);
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
virDomainObjPtr parallelsDomObjFromDomainRef(virDomainPtr domain);
virJSONValuePtr parallelsParseOutput(const char *binary, ...)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL;
char * parallelsGetOutput(const char *binary, ...)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL;
int parallelsCmdRun(const char *binary, ...)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL;
char * parallelsAddFileExt(const char *path, const char *ext);
void parallelsDriverLock(parallelsConnPtr driver);
void parallelsDriverUnlock(parallelsConnPtr driver);
virStorageVolPtr parallelsStorageVolLookupByPathLocked(virConnectPtr conn,
const char *path);
int parallelsStorageVolDefRemove(virStoragePoolObjPtr privpool,
virStorageVolDefPtr privvol);
parallels: add block device statistics to driver Statistics provided through PCS SDK. As we have only async interface in SDK we need to be subscribed to statistics in order to get it. Trivial solution on every stat request to subscribe, wait event and then unsubscribe will lead to significant delays in case of a number of successive requests, as the event will be delivered on next PCS server notify cycle. On the other hand we don't want to keep unnesessary subscribtion. So we take an hibrid solution to subcsribe on first request and then keep a subscription while requests are active. We populate cache of statistics on subscribtion events and use this cache to serve libvirts requests. * Cache details. Cache is just handle to last arrived event, we call this cache as if this handle is valid it is used to serve synchronous statistics requests. We use number of successive events count to detect that user lost interest to statistics. We reset this count to 0 on every request. If more than PARALLELS_STATISTICS_DROP_COUNT successive events arrive we unsubscribe. Special value of -1 of this counter is used to differentiate between subscribed/unsubscribed state to protect from delayed events. Values of PARALLELS_STATISTICS_DROP_COUNT and PARALLELS_STATISTICS_TIMEOUT are just drop-ins, choosen without special consideration. * Thread safety issues Use parallelsDomObjFromDomainRef in parallelsDomainBlockStats as we could wait on domain lock down on stack in prlsdkGetStatsParam and if we won't keep reference we could get dangling pointer on return from wait. Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@parallels.com>
2015-06-09 07:35:53 +00:00
#define PARALLELS_BLOCK_STATS_FOREACH(OP) \
OP(rd_req, VIR_DOMAIN_BLOCK_STATS_READ_REQ, "read_requests") \
OP(rd_bytes, VIR_DOMAIN_BLOCK_STATS_READ_BYTES, "read_total") \
OP(wr_req, VIR_DOMAIN_BLOCK_STATS_WRITE_REQ, "write_requests") \
OP(wr_bytes, VIR_DOMAIN_BLOCK_STATS_WRITE_BYTES, "write_total")
#endif