Linux kernel mirror (for testing)
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linux
1/*
2 * BSG helper library
3 *
4 * Copyright (C) 2008 James Smart, Emulex Corporation
5 * Copyright (C) 2011 Red Hat, Inc. All rights reserved.
6 * Copyright (C) 2011 Mike Christie
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23#ifndef _BLK_BSG_
24#define _BLK_BSG_
25
26#include <linux/blkdev.h>
27
28struct request;
29struct device;
30struct scatterlist;
31struct request_queue;
32
33struct bsg_buffer {
34 unsigned int payload_len;
35 int sg_cnt;
36 struct scatterlist *sg_list;
37};
38
39struct bsg_job {
40 struct device *dev;
41 struct request *req;
42
43 struct kref kref;
44
45 /* Transport/driver specific request/reply structs */
46 void *request;
47 void *reply;
48
49 unsigned int request_len;
50 unsigned int reply_len;
51 /*
52 * On entry : reply_len indicates the buffer size allocated for
53 * the reply.
54 *
55 * Upon completion : the message handler must set reply_len
56 * to indicates the size of the reply to be returned to the
57 * caller.
58 */
59
60 /* DMA payloads for the request/response */
61 struct bsg_buffer request_payload;
62 struct bsg_buffer reply_payload;
63
64 void *dd_data; /* Used for driver-specific storage */
65};
66
67void bsg_job_done(struct bsg_job *job, int result,
68 unsigned int reply_payload_rcv_len);
69struct request_queue *bsg_setup_queue(struct device *dev, char *name,
70 bsg_job_fn *job_fn, int dd_job_size);
71void bsg_job_put(struct bsg_job *job);
72int __must_check bsg_job_get(struct bsg_job *job);
73
74#endif