58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
#ifndef _SCSI_SCSI_REQUEST_H
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#define _SCSI_SCSI_REQUEST_H
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#include <scsi/scsi_cmnd.h>
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struct request;
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struct scsi_cmnd;
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struct scsi_device;
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struct Scsi_Host;
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/*
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* This is essentially a slimmed down version of Scsi_Cmnd. The point of
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* having this is that requests that are injected into the queue as result
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* of things like ioctls and character devices shouldn't be using a
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* Scsi_Cmnd until such a time that the command is actually at the head
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* of the queue and being sent to the driver.
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*/
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struct scsi_request {
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int sr_magic;
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int sr_result; /* Status code from lower level driver */
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unsigned char sr_sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE
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* when CHECK CONDITION is
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* received on original command
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* (auto-sense) */
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struct Scsi_Host *sr_host;
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struct scsi_device *sr_device;
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struct scsi_cmnd *sr_command;
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struct request *sr_request; /* A copy of the command we are
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working on */
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unsigned sr_bufflen; /* Size of data buffer */
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void *sr_buffer; /* Data buffer */
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int sr_allowed;
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enum dma_data_direction sr_data_direction;
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unsigned char sr_cmd_len;
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unsigned char sr_cmnd[MAX_COMMAND_SIZE];
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void (*sr_done) (struct scsi_cmnd *); /* Mid-level done function */
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int sr_timeout_per_command;
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unsigned short sr_use_sg; /* Number of pieces of scatter-gather */
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unsigned short sr_sglist_len; /* size of malloc'd scatter-gather list */
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unsigned sr_underflow; /* Return error if less than
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this amount is transferred */
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void *upper_private_data; /* reserved for owner (usually upper
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level driver) of this request */
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};
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extern struct scsi_request *scsi_allocate_request(struct scsi_device *, int);
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extern void scsi_release_request(struct scsi_request *);
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extern void scsi_wait_req(struct scsi_request *, const void *cmnd,
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void *buffer, unsigned bufflen,
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int timeout, int retries);
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extern void scsi_do_req(struct scsi_request *, const void *cmnd,
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void *buffer, unsigned bufflen,
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void (*done) (struct scsi_cmnd *),
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int timeout, int retries);
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#endif /* _SCSI_SCSI_REQUEST_H */
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