libvirt/src/datatypes.h

/*
 * datatypes.h: management of structs for public data types
 *
 * Copyright (C) 2006-2008 Red Hat, 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 */

#ifndef __VIRT_DATATYPES_H_
#define __VIRT_DATATYPES_H_

#include "internal.h"

#include "hash.h"
#include "driver.h"
#include "threads.h"

/**
 * VIR_CONNECT_MAGIC:
 *
 * magic value used to protect the API when pointers to connection structures
 * are passed down by the uers.
 */
#define VIR_CONNECT_MAGIC 	0x4F23DEAD
#define VIR_IS_CONNECT(obj)	((obj) && (obj)->magic==VIR_CONNECT_MAGIC)


/**
 * VIR_DOMAIN_MAGIC:
 *
 * magic value used to protect the API when pointers to domain structures
 * are passed down by the users.
 */
#define VIR_DOMAIN_MAGIC		0xDEAD4321
#define VIR_IS_DOMAIN(obj)		((obj) && (obj)->magic==VIR_DOMAIN_MAGIC)
#define VIR_IS_CONNECTED_DOMAIN(obj)	(VIR_IS_DOMAIN(obj) && VIR_IS_CONNECT((obj)->conn))

/**
 * VIR_NETWORK_MAGIC:
 *
 * magic value used to protect the API when pointers to network structures
 * are passed down by the users.
 */
#define VIR_NETWORK_MAGIC		0xDEAD1234
#define VIR_IS_NETWORK(obj)		((obj) && (obj)->magic==VIR_NETWORK_MAGIC)
#define VIR_IS_CONNECTED_NETWORK(obj)	(VIR_IS_NETWORK(obj) && VIR_IS_CONNECT((obj)->conn))

/**
 * VIR_STORAGE_POOL_MAGIC:
 *
 * magic value used to protect the API when pointers to storage pool structures
 * are passed down by the users.
 */
#define VIR_STORAGE_POOL_MAGIC		0xDEAD5678
#define VIR_IS_STORAGE_POOL(obj)		((obj) && (obj)->magic==VIR_STORAGE_POOL_MAGIC)
#define VIR_IS_CONNECTED_STORAGE_POOL(obj)	(VIR_IS_STORAGE_POOL(obj) && VIR_IS_CONNECT((obj)->conn))

/**
 * VIR_STORAGE_VOL_MAGIC:
 *
 * magic value used to protect the API when pointers to storage vol structures
 * are passed down by the users.
 */
#define VIR_STORAGE_VOL_MAGIC		0xDEAD8765
#define VIR_IS_STORAGE_VOL(obj)		((obj) && (obj)->magic==VIR_STORAGE_VOL_MAGIC)
#define VIR_IS_CONNECTED_STORAGE_VOL(obj)	(VIR_IS_STORAGE_VOL(obj) && VIR_IS_CONNECT((obj)->conn))

/**
 * VIR_NODE_DEVICE_MAGIC:
 *
 * magic value used to protect the API when pointers to storage vol structures
 * are passed down by the users.
 */
#define VIR_NODE_DEVICE_MAGIC                   0xDEAD5679
#define VIR_IS_NODE_DEVICE(obj)                 ((obj) && (obj)->magic==VIR_NODE_DEVICE_MAGIC)
#define VIR_IS_CONNECTED_NODE_DEVICE(obj)       (VIR_IS_NODE_DEVICE(obj) && VIR_IS_CONNECT((obj)->conn))


/**
 * _virConnect:
 *
 * Internal structure associated to a connection
 */
struct _virConnect {
    /* All the variables from here, until the 'lock' declaration
     * are setup at time of connection open, and never changed
     * since. Thus no need to lock when accessing them
     */
    unsigned int magic;     /* specific value to check */
    int flags;              /* a set of connection flags */
    xmlURIPtr uri;          /* connection URI */

    /* The underlying hypervisor driver and network driver. */
    virDriverPtr      driver;
    virNetworkDriverPtr networkDriver;
    virStorageDriverPtr storageDriver;
    virDeviceMonitorPtr  deviceMonitor;

    /* Private data pointer which can be used by driver and
     * network driver as they wish.
     * NB: 'private' is a reserved word in C++.
     */
    void *            privateData;
    void *            networkPrivateData;
    void *            storagePrivateData;
    void *            devMonPrivateData;

    /*
     * The lock mutex must be acquired before accessing/changing
     * any of members following this point, or changing the ref
     * count of any virDomain/virNetwork object associated with
     * this connection
     */
    virMutex lock;

    /* Per-connection error. */
    virError err;           /* the last error */
    virErrorFunc handler;   /* associated handlet */
    void *userData;         /* the user data */

    virHashTablePtr domains;  /* hash table for known domains */
    virHashTablePtr networks; /* hash table for known domains */
    virHashTablePtr storagePools;/* hash table for known storage pools */
    virHashTablePtr storageVols;/* hash table for known storage vols */
    virHashTablePtr nodeDevices; /* hash table for known node devices */
    int refs;                 /* reference count */
};

/**
* _virDomain:
*
* Internal structure associated to a domain
*/
struct _virDomain {
    unsigned int magic;                  /* specific value to check */
    int refs;                            /* reference count */
    virConnectPtr conn;                  /* pointer back to the connection */
    char *name;                          /* the domain external name */
    int id;                              /* the domain ID */
    unsigned char uuid[VIR_UUID_BUFLEN]; /* the domain unique identifier */
};

/**
* _virNetwork:
*
* Internal structure associated to a domain
*/
struct _virNetwork {
    unsigned int magic;                  /* specific value to check */
    int refs;                            /* reference count */
    virConnectPtr conn;                  /* pointer back to the connection */
    char *name;                          /* the network external name */
    unsigned char uuid[VIR_UUID_BUFLEN]; /* the network unique identifier */
};

/**
* _virStoragePool:
*
* Internal structure associated to a storage pool
*/
struct _virStoragePool {
    unsigned int magic;                  /* specific value to check */
    int refs;                            /* reference count */
    virConnectPtr conn;                  /* pointer back to the connection */
    char *name;                          /* the storage pool external name */
    unsigned char uuid[VIR_UUID_BUFLEN]; /* the storage pool unique identifier */
};

/**
* _virStorageVol:
*
* Internal structure associated to a storage volume
*/
struct _virStorageVol {
    unsigned int magic;                  /* specific value to check */
    int refs;                            /* reference count */
    virConnectPtr conn;                  /* pointer back to the connection */
    char *pool;                          /* Pool name of owner */
    char *name;                          /* the storage vol external name */
    /* XXX currently abusing path for this. Ought not to be so evil */
    char key[PATH_MAX];                  /* unique key for storage vol */
};

/**
 * _virNodeDevice:
 *
 * Internal structure associated with a node device
 */
struct _virNodeDevice {
    unsigned int magic;                 /* specific value to check */
    int refs;                           /* reference count */
    virConnectPtr conn;                 /* pointer back to the connection */
    char *name;                         /* device name (unique on node) */
    char *parent;                       /* parent device name */
};


/************************************************************************
 *									*
 *	API for domain/connections (de)allocations and lookups		*
 *									*
 ************************************************************************/

virConnectPtr virGetConnect(void);
int virUnrefConnect(virConnectPtr conn);
virDomainPtr virGetDomain(virConnectPtr conn,
                            const char *name,
                            const unsigned char *uuid);
int virUnrefDomain(virDomainPtr domain);
virNetworkPtr virGetNetwork(virConnectPtr conn,
                              const char *name,
                              const unsigned char *uuid);
int virUnrefNetwork(virNetworkPtr network);

virStoragePoolPtr virGetStoragePool(virConnectPtr conn,
                                      const char *name,
                                      const unsigned char *uuid);
int virUnrefStoragePool(virStoragePoolPtr pool);
virStorageVolPtr virGetStorageVol(virConnectPtr conn,
                                     const char *pool,
                                    const char *name,
                                    const char *key);
int virUnrefStorageVol(virStorageVolPtr vol);

virNodeDevicePtr virGetNodeDevice(virConnectPtr conn,
                                  const char *name);
int virUnrefNodeDevice(virNodeDevicePtr dev);

#endif