88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
|
|
* BSG helper library
|
|
*
|
|
* Copyright (C) 2008 James Smart, Emulex Corporation
|
|
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
|
|
* Copyright (C) 2011 Mike Christie
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
#ifndef _BLK_BSG_
|
|
#define _BLK_BSG_
|
|
|
|
#include <linux/blkdev.h>
|
|
#include <scsi/scsi_request.h>
|
|
|
|
struct request;
|
|
struct device;
|
|
struct scatterlist;
|
|
struct request_queue;
|
|
|
|
typedef int (bsg_job_fn) (struct bsg_job *);
|
|
typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *);
|
|
|
|
struct bsg_buffer {
|
|
unsigned int payload_len;
|
|
int sg_cnt;
|
|
struct scatterlist *sg_list;
|
|
};
|
|
|
|
struct bsg_job {
|
|
struct device *dev;
|
|
|
|
struct kref kref;
|
|
|
|
unsigned int timeout;
|
|
|
|
/* Transport/driver specific request/reply structs */
|
|
void *request;
|
|
void *reply;
|
|
|
|
unsigned int request_len;
|
|
unsigned int reply_len;
|
|
/*
|
|
* On entry : reply_len indicates the buffer size allocated for
|
|
* the reply.
|
|
*
|
|
* Upon completion : the message handler must set reply_len
|
|
* to indicates the size of the reply to be returned to the
|
|
* caller.
|
|
*/
|
|
|
|
/* DMA payloads for the request/response */
|
|
struct bsg_buffer request_payload;
|
|
struct bsg_buffer reply_payload;
|
|
|
|
int result;
|
|
unsigned int reply_payload_rcv_len;
|
|
|
|
/* BIDI support */
|
|
struct request *bidi_rq;
|
|
struct bio *bidi_bio;
|
|
|
|
void *dd_data; /* Used for driver-specific storage */
|
|
};
|
|
|
|
void bsg_job_done(struct bsg_job *job, int result,
|
|
unsigned int reply_payload_rcv_len);
|
|
struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
|
|
bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size);
|
|
void bsg_remove_queue(struct request_queue *q);
|
|
void bsg_job_put(struct bsg_job *job);
|
|
int __must_check bsg_job_get(struct bsg_job *job);
|
|
|
|
#endif
|