include/linux/bsg-lib.h

   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 #include <scsi/scsi_request.h>
  28
  29 struct request;
  30 struct device;
  31 struct scatterlist;
  32 struct request_queue;
  33
  34 struct bsg_buffer {
  35         unsigned int payload_len;
  36         int sg_cnt;
  37         struct scatterlist *sg_list;
  38 };
  39
  40 struct bsg_job {
  41         struct scsi_request sreq;
  42         struct device *dev;
  43         struct request *req;
  44
  45         struct kref kref;
  46
  47         /* Transport/driver specific request/reply structs */
  48         void *request;
  49         void *reply;
  50
  51         unsigned int request_len;
  52         unsigned int reply_len;
  53         /*
  54          * On entry : reply_len indicates the buffer size allocated for
  55          * the reply.
  56          *
  57          * Upon completion : the message handler must set reply_len
  58          *  to indicates the size of the reply to be returned to the
  59          *  caller.
  60          */
  61
  62         /* DMA payloads for the request/response */
  63         struct bsg_buffer request_payload;
  64         struct bsg_buffer reply_payload;
  65
  66         void *dd_data;          /* Used for driver-specific storage */
  67 };
  68
  69 void bsg_job_done(struct bsg_job *job, int result,
  70                   unsigned int reply_payload_rcv_len);
  71 struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
  72                 bsg_job_fn *job_fn, int dd_job_size,
  73                 void (*release)(struct device *));
  74 void bsg_job_put(struct bsg_job *job);
  75 int __must_check bsg_job_get(struct bsg_job *job);
  76
  77 #endif