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54972be843
Commit v1.2.4-52-gda879e5 fixed issues with domains started before
sanlock driver was enabled by checking whether a running domain is
registered with sanlock and if it's not, sanlock driver is basically
ignored for the domain.
However, it was checking this even for domain which has just been
started and no sanlock_* API was called for them yet. This results in
cmd 9 target pid 2135544 not found
error messages to appear in sanlock.log whenever we start a new domain.
This patch avoids this useless check for freshly started domains.
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
320 lines
10 KiB
C
320 lines
10 KiB
C
/*
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* lock_driver.h: Defines the lock driver plugin API
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*
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* Copyright (C) 2010-2011, 2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __VIR_PLUGINS_LOCK_DRIVER_H__
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# define __VIR_PLUGINS_LOCK_DRIVER_H__
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# include "internal.h"
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# include "domain_conf.h"
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typedef struct _virLockManager virLockManager;
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typedef virLockManager *virLockManagerPtr;
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typedef struct _virLockDriver virLockDriver;
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typedef virLockDriver *virLockDriverPtr;
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typedef struct _virLockManagerParam virLockManagerParam;
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typedef virLockManagerParam *virLockManagerParamPtr;
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typedef enum {
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/* State passing is used to re-acquire existing leases */
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VIR_LOCK_MANAGER_USES_STATE = (1 << 0)
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} virLockManagerFlags;
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typedef enum {
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/* The managed object is a virtual guest domain */
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VIR_LOCK_MANAGER_OBJECT_TYPE_DOMAIN = 0,
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} virLockManagerObjectType;
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typedef enum {
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/* The resource to be locked is a virtual disk */
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VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK = 0,
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/* A lease against an arbitrary resource */
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VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE = 1,
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} virLockManagerResourceType;
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typedef enum {
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/* The resource is assigned in readonly mode */
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VIR_LOCK_MANAGER_RESOURCE_READONLY = (1 << 0),
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/* The resource is assigned in shared, writable mode */
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VIR_LOCK_MANAGER_RESOURCE_SHARED = (1 << 1),
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} virLockManagerResourceFlags;
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typedef enum {
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/* Don't acquire the resources, just register the object PID */
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VIR_LOCK_MANAGER_ACQUIRE_REGISTER_ONLY = (1 << 0),
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/* Prevent further lock/unlock calls from this process */
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VIR_LOCK_MANAGER_ACQUIRE_RESTRICT = (1 << 1),
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} virLockManagerAcquireFlags;
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typedef enum {
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/* virLockManagerNew called for a freshly started domain */
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VIR_LOCK_MANAGER_NEW_STARTED = (1 << 0),
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} virLockManagerNewFlags;
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enum {
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VIR_LOCK_MANAGER_PARAM_TYPE_STRING,
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VIR_LOCK_MANAGER_PARAM_TYPE_CSTRING,
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VIR_LOCK_MANAGER_PARAM_TYPE_INT,
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VIR_LOCK_MANAGER_PARAM_TYPE_LONG,
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VIR_LOCK_MANAGER_PARAM_TYPE_UINT,
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VIR_LOCK_MANAGER_PARAM_TYPE_ULONG,
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VIR_LOCK_MANAGER_PARAM_TYPE_DOUBLE,
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VIR_LOCK_MANAGER_PARAM_TYPE_UUID,
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};
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struct _virLockManagerParam {
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int type;
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const char *key;
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union {
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int iv;
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long long l;
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unsigned int ui;
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unsigned long long ul;
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double d;
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char *str;
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const char *cstr;
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unsigned char uuid[16];
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} value;
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};
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/*
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* Changes in major version denote incompatible ABI changes
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* Changes in minor version denote new compatible API entry points
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* Changes in micro version denote new compatible flags
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*/
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# define VIR_LOCK_MANAGER_VERSION_MAJOR 1
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# define VIR_LOCK_MANAGER_VERSION_MINOR 0
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# define VIR_LOCK_MANAGER_VERSION_MICRO 0
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# define VIR_LOCK_MANAGER_VERSION \
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((VIR_LOCK_MANAGER_VERSION_MAJOR * 1000 * 1000) + \
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(VIR_LOCK_MANAGER_VERSION_MINOR * 1000) + \
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(VIR_LOCK_MANAGER_VERSION_MICRO))
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/**
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* virLockDriverInit:
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* @version: the libvirt requested plugin ABI version
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* @flags: the libvirt requested plugin optional extras
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*
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* Allow the plugin to validate the libvirt requested
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* plugin version / flags. This allows the plugin impl
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* to block its use in versions of libvirtd which are
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* too old to support key features.
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*
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* NB: A plugin may be loaded multiple times, for different
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* libvirt drivers (eg QEMU, LXC, UML)
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*
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* Returns -1 if the requested version/flags were inadequate
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*/
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typedef int (*virLockDriverInit)(unsigned int version,
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const char *configFile,
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unsigned int flags);
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/**
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* virLockDriverDeinit:
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*
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* Called to release any resources prior to the plugin
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* being unloaded from memory. Returns -1 to prevent
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* plugin from being unloaded from memory.
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*/
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typedef int (*virLockDriverDeinit)(void);
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/**
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* virLockManagerNew:
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* @man: the lock manager context
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* @type: the type of process to be supervised
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* @nparams: number of metadata parameters
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* @params: extra metadata parameters
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* @flags: bitwise-OR of virLockManagerNewFlags
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*
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* Initialize a new context to supervise a process, usually
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* a virtual machine. The lock driver implementation can use
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* the <code>privateData</code> field of <code>man</code>
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* to store a pointer to any driver specific state.
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*
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* If @flags contains VIR_LOCK_MANAGER_NEW_STARTED, this API is called for
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* a domain that has just been started and may therefore skip some actions.
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* Specifically, checking whether the domain is registered with a lock
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* daemon is useless in this case.
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*
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* A process of VIR_LOCK_MANAGER_START_DOMAIN will be
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* given the following parameters
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*
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* - id: the domain unique id (unsigned int)
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* - uuid: the domain uuid (uuid)
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* - name: the domain name (string)
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* - pid: process ID to own/owning the lock (unsigned int)
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* - uri: URI for connecting to the driver the domain belongs to (string)
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*
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* Returns 0 if successful initialized a new context, -1 on error
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*/
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typedef int (*virLockDriverNew)(virLockManagerPtr man,
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unsigned int type,
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size_t nparams,
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virLockManagerParamPtr params,
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unsigned int flags);
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/**
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* virLockDriverFree:
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* @manager: the lock manager context
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*
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* Release any resources associated with the lock manager
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* context private data
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*/
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typedef void (*virLockDriverFree)(virLockManagerPtr man);
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/**
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* virLockDriverAddResource:
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* @manager: the lock manager context
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* @type: the resource type virLockManagerResourceType
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* @name: the resource name
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* @nparams: number of metadata parameters
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* @params: extra metadata parameters
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* @flags: the resource access flags
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*
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* Assign a resource to a managed object. This will
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* only be called prior to the object is being locked
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* when it is inactive (e.g. to set the initial boot
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* time disk assignments on a VM).
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* The format of @name varies according to
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* the resource @type. A VIR_LOCK_MANAGER_RESOURCE_TYPE_DISK
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* will have the fully qualified file path, while a resource
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* of type VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE will have the
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* unique name of the lease
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*
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* A resource of type VIR_LOCK_MANAGER_RESOURCE_TYPE_LEASE
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* will receive at least the following extra parameters
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*
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* - 'path': a fully qualified path to the lockspace
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* - 'lockspace': globally string identifying the lockspace name
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* - 'offset': byte offset within the lease (unsigned long long)
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*
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* If no flags are given, the resource is assumed to be
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* used in exclusive, read-write mode. Access can be
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* relaxed to readonly, or shared read-write.
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*
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* Returns 0 on success, or -1 on failure
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*/
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typedef int (*virLockDriverAddResource)(virLockManagerPtr man,
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unsigned int type,
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const char *name,
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size_t nparams,
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virLockManagerParamPtr params,
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unsigned int flags);
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/**
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* virLockDriverAcquire:
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* @manager: the lock manager context
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* @state: the current lock state
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* @flags: optional flags, currently unused
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* @action: action to take when lock is lost
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* @fd: optional return the leaked FD
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*
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* Start managing resources for the object. This
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* must be called from the PID that represents the
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* object to be managed. If the lock is lost at any
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* time, the specified action will be taken.
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* The optional state contains information about the
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* locks previously held for the object.
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*
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* The file descriptor returned in @fd is one that
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* is intentionally leaked and should not be closed.
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* It is returned so that it can be labelled by the
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* security managers (if required).
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*
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* Returns 0 on success, or -1 on failure
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*/
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typedef int (*virLockDriverAcquire)(virLockManagerPtr man,
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const char *state,
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unsigned int flags,
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virDomainLockFailureAction action,
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int *fd);
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/**
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* virLockDriverRelease:
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* @manager: the lock manager context
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* @state: pointer to be filled with lock state
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* @flags: optional flags
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*
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* Inform the lock manager that the supervised process has
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* been, or can be stopped.
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*
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* Returns 0 on success, or -1 on failure
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*/
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typedef int (*virLockDriverRelease)(virLockManagerPtr man,
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char **state,
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unsigned int flags);
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/**
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* virLockDriverInquire:
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* @manager: the lock manager context
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* @state: pointer to be filled with lock state
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* @flags: optional flags, currently unused
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*
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* Retrieve the current lock state. The returned
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* lock state may be NULL if none is required. The
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* caller is responsible for freeing the lock
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* state string when it is no longer required
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*
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* Returns 0 on success, or -1 on failure.
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*/
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typedef int (*virLockDriverInquire)(virLockManagerPtr man,
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char **state,
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unsigned int flags);
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struct _virLockManager {
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virLockDriverPtr driver;
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void *privateData;
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};
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/**
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* The plugin must export a static instance of this
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* driver table, with the name 'virLockDriverImpl'
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*/
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struct _virLockDriver {
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/**
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* @version: the newest implemented plugin ABI version
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* @flags: optional flags, currently unused
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*/
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unsigned int version;
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unsigned int flags;
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virLockDriverInit drvInit;
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virLockDriverDeinit drvDeinit;
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virLockDriverNew drvNew;
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virLockDriverFree drvFree;
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virLockDriverAddResource drvAddResource;
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virLockDriverAcquire drvAcquire;
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virLockDriverRelease drvRelease;
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virLockDriverInquire drvInquire;
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};
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#endif /* __VIR_PLUGINS_LOCK_DRIVER_H__ */
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