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TOMOYO Linux Cross Reference
Linux/include/linux/bsg-lib.h

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  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 typedef int (bsg_job_fn) (struct bsg_job *);
 35 typedef enum blk_eh_timer_return (bsg_timeout_fn)(struct request *);
 36 
 37 struct bsg_buffer {
 38         unsigned int payload_len;
 39         int sg_cnt;
 40         struct scatterlist *sg_list;
 41 };
 42 
 43 struct bsg_job {
 44         struct device *dev;
 45 
 46         struct kref kref;
 47 
 48         unsigned int timeout;
 49 
 50         /* Transport/driver specific request/reply structs */
 51         void *request;
 52         void *reply;
 53 
 54         unsigned int request_len;
 55         unsigned int reply_len;
 56         /*
 57          * On entry : reply_len indicates the buffer size allocated for
 58          * the reply.
 59          *
 60          * Upon completion : the message handler must set reply_len
 61          *  to indicates the size of the reply to be returned to the
 62          *  caller.
 63          */
 64 
 65         /* DMA payloads for the request/response */
 66         struct bsg_buffer request_payload;
 67         struct bsg_buffer reply_payload;
 68 
 69         int result;
 70         unsigned int reply_payload_rcv_len;
 71 
 72         void *dd_data;          /* Used for driver-specific storage */
 73 };
 74 
 75 void bsg_job_done(struct bsg_job *job, int result,
 76                   unsigned int reply_payload_rcv_len);
 77 struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
 78                 bsg_job_fn *job_fn, bsg_timeout_fn *timeout, int dd_job_size);
 79 void bsg_remove_queue(struct request_queue *q);
 80 void bsg_job_put(struct bsg_job *job);
 81 int __must_check bsg_job_get(struct bsg_job *job);
 82 
 83 #endif
 84 

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