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1#ifndef _SCSI_SCSI_REQUEST_H
2#define _SCSI_SCSI_REQUEST_H
3
4#include <scsi/scsi_cmnd.h>
5
6struct request;
7struct scsi_cmnd;
8struct scsi_device;
9struct Scsi_Host;
10
11
12/*
13 * This is essentially a slimmed down version of Scsi_Cmnd. The point of
14 * having this is that requests that are injected into the queue as result
15 * of things like ioctls and character devices shouldn't be using a
16 * Scsi_Cmnd until such a time that the command is actually at the head
17 * of the queue and being sent to the driver.
18 */
19struct scsi_request {
20 int sr_magic;
21 int sr_result; /* Status code from lower level driver */
22 unsigned char sr_sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE
23 * when CHECK CONDITION is
24 * received on original command
25 * (auto-sense) */
26
27 struct Scsi_Host *sr_host;
28 struct scsi_device *sr_device;
29 struct scsi_cmnd *sr_command;
30 struct request *sr_request; /* A copy of the command we are
31 working on */
32 unsigned sr_bufflen; /* Size of data buffer */
33 void *sr_buffer; /* Data buffer */
34 int sr_allowed;
35 enum dma_data_direction sr_data_direction;
36 unsigned char sr_cmd_len;
37 unsigned char sr_cmnd[MAX_COMMAND_SIZE];
38 void (*sr_done) (struct scsi_cmnd *); /* Mid-level done function */
39 int sr_timeout_per_command;
40 unsigned short sr_use_sg; /* Number of pieces of scatter-gather */
41 unsigned short sr_sglist_len; /* size of malloc'd scatter-gather list */
42 unsigned sr_underflow; /* Return error if less than
43 this amount is transferred */
44 void *upper_private_data; /* reserved for owner (usually upper
45 level driver) of this request */
46};
47
48extern struct scsi_request *scsi_allocate_request(struct scsi_device *, gfp_t);
49extern void scsi_release_request(struct scsi_request *);
50extern void scsi_do_req(struct scsi_request *, const void *cmnd,
51 void *buffer, unsigned bufflen,
52 void (*done) (struct scsi_cmnd *),
53 int timeout, int retries);
54#endif /* _SCSI_SCSI_REQUEST_H */