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/*
* Copyright (c) 2008, XenSource Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of XenSource Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _TAPDISK_VBD_H_
#define _TAPDISK_VBD_H_
#include <sys/time.h>
#include <xenctrl.h>
#include <xen/io/blkif.h>
#include "tapdisk.h"
#include "scheduler.h"
#include "tapdisk-image.h"
#define TD_VBD_MAX_RETRIES 100
#define TD_VBD_RETRY_INTERVAL 1
#define TD_VBD_DEAD 0x0001
#define TD_VBD_CLOSED 0x0002
#define TD_VBD_QUIESCE_REQUESTED 0x0004
#define TD_VBD_QUIESCED 0x0008
#define TD_VBD_PAUSE_REQUESTED 0x0010
#define TD_VBD_PAUSED 0x0020
#define TD_VBD_SHUTDOWN_REQUESTED 0x0040
#define TD_VBD_LOCKING 0x0080
#define TD_VBD_RETRY_NEEDED 0x0100
#define TD_VBD_LOG_DROPPED 0x0200
typedef struct td_ring td_ring_t;
typedef struct td_vbd_request td_vbd_request_t;
typedef struct td_vbd_driver_info td_vbd_driver_info_t;
typedef struct td_vbd_handle td_vbd_t;
typedef void (*td_vbd_cb_t) (void *, blkif_response_t *);
struct td_ring {
int fd;
char *mem;
blkif_sring_t *sring;
blkif_back_ring_t fe_ring;
unsigned long vstart;
};
struct td_vbd_request {
blkif_request_t req;
int16_t status;
int error;
int blocked; /* blocked on a dependency */
int submitting;
int secs_pending;
int num_retries;
struct timeval last_try;
td_vbd_t *vbd;
struct list_head next;
};
struct td_vbd_driver_info {
char *params;
int type;
struct list_head next;
};
struct td_vbd_handle {
char *name;
td_uuid_t uuid;
int minor;
struct list_head driver_stack;
int storage;
uint8_t reopened;
uint8_t reactivated;
td_flag_t flags;
td_flag_t state;
struct list_head images;
struct list_head new_requests;
struct list_head pending_requests;
struct list_head failed_requests;
struct list_head completed_requests;
td_vbd_request_t request_list[MAX_REQUESTS];
td_ring_t ring;
event_id_t ring_event_id;
td_vbd_cb_t callback;
void *argument;
struct list_head next;
struct timeval ts;
uint64_t received;
uint64_t returned;
uint64_t kicked;
uint64_t secs_pending;
uint64_t retries;
uint64_t errors;
};
#define tapdisk_vbd_for_each_request(vreq, tmp, list) \
list_for_each_entry_safe((vreq), (tmp), (list), next)
#define tapdisk_vbd_for_each_image(vbd, image, tmp) \
list_for_each_entry_safe((image), (tmp), &(vbd)->images, next)
static inline void
tapdisk_vbd_move_request(td_vbd_request_t *vreq, struct list_head *dest)
{
list_del(&vreq->next);
INIT_LIST_HEAD(&vreq->next);
list_add_tail(&vreq->next, dest);
}
static inline void
tapdisk_vbd_add_image(td_vbd_t *vbd, td_image_t *image)
{
list_add_tail(&image->next, &vbd->images);
}
static inline int
tapdisk_vbd_is_last_image(td_vbd_t *vbd, td_image_t *image)
{
return list_is_last(&image->next, &vbd->images);
}
td_image_t *
tapdisk_vbd_first_image(td_vbd_t *vbd);
static inline td_image_t *
tapdisk_vbd_last_image(td_vbd_t *vbd)
{
return list_entry(vbd->images.prev, td_image_t, next);
}
static inline td_image_t *
tapdisk_vbd_next_image(td_image_t *image)
{
return list_entry(image->next.next, td_image_t, next);
}
td_vbd_t *tapdisk_vbd_create(td_uuid_t);
int tapdisk_vbd_initialize(td_uuid_t);
void tapdisk_vbd_set_callback(td_vbd_t *, td_vbd_cb_t, void *);
int tapdisk_vbd_parse_stack(td_vbd_t *vbd, const char *path);
int tapdisk_vbd_open(td_vbd_t *, const char *, uint16_t,
uint16_t, int, const char *, td_flag_t);
int tapdisk_vbd_close(td_vbd_t *);
void tapdisk_vbd_free(td_vbd_t *);
void tapdisk_vbd_free_stack(td_vbd_t *);
int tapdisk_vbd_open_stack(td_vbd_t *, uint16_t, td_flag_t);
int tapdisk_vbd_open_vdi(td_vbd_t *, const char *,
uint16_t, uint16_t, td_flag_t);
void tapdisk_vbd_close_vdi(td_vbd_t *);
int tapdisk_vbd_attach(td_vbd_t *, const char *, int);
void tapdisk_vbd_detach(td_vbd_t *);
void tapdisk_vbd_forward_request(td_request_t);
int tapdisk_vbd_get_image_info(td_vbd_t *, image_t *);
int tapdisk_vbd_queue_ready(td_vbd_t *);
int tapdisk_vbd_retry_needed(td_vbd_t *);
int tapdisk_vbd_quiesce_queue(td_vbd_t *);
int tapdisk_vbd_start_queue(td_vbd_t *);
int tapdisk_vbd_issue_requests(td_vbd_t *);
int tapdisk_vbd_kill_queue(td_vbd_t *);
int tapdisk_vbd_pause(td_vbd_t *);
int tapdisk_vbd_resume(td_vbd_t *, const char *, uint16_t);
int tapdisk_vbd_kick(td_vbd_t *);
void tapdisk_vbd_check_state(td_vbd_t *);
void tapdisk_vbd_check_progress(td_vbd_t *);
void tapdisk_vbd_debug(td_vbd_t *);
void tapdisk_vbd_complete_vbd_request(td_vbd_t *, td_vbd_request_t *);
#endif
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