*参照元 [#v12adc3a]
#backlinks
*説明 [#cf4eab36]
-パス: [[linux-2.6.25/include/scsi/scsi_cmnd.h]]
-FIXME: これは何？
--説明
**参考 [#f200bf3d]
*実装 [#y6fbb4ba]
struct scsi_cmnd {
struct scsi_device *device;
-
--[[linux-2.6.25/scsi_device]]
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
int eh_eflags; /* Used by error handlr */
-
--[[linux-2.6.25/list_head]]
/*
* A SCSI Command is assigned a nonzero serial_number before passed
* to the driver's queue command function. The serial_number is
* cleared when scsi_done is entered indicating that the command
* has been completed. It is a bug for LLDDs to use this number
* for purposes other than printk (and even that is only useful
* for debugging).
*/
unsigned long serial_number;
/*
* This is set to jiffies as it was when the command was first
* allocated. It is used to time how long the command has
* been outstanding
*/
unsigned long jiffies_at_alloc;
int retries;
int allowed;
int timeout_per_command;
unsigned char cmd_len;
enum dma_data_direction sc_data_direction;
-
--[[linux-2.6.25/dma_data_direction]]
/* These elements define the operation we are about to perform */
#define MAX_COMMAND_SIZE 16
unsigned char cmnd[MAX_COMMAND_SIZE];
struct timer_list eh_timeout; /* Used to time out the command. */
-
--[[linux-2.6.25/timer_list]]
/* These elements define the operation we ultimately want to perform */
struct scsi_data_buffer sdb;
-
--[[linux-2.6.25/scsi_data_buffer]]
unsigned underflow; /* Return error if less than
this amount is transferred */
unsigned transfersize; /* How much we are guaranteed to
transfer with each SCSI transfer
(ie, between disconnect /
reconnects. Probably == sector
size */
struct request *request; /* The command we are
working on */
-
--[[linux-2.6.25/request]]
#define SCSI_SENSE_BUFFERSIZE 96
unsigned char *sense_buffer;
/* obtained by REQUEST SENSE when
* CHECK CONDITION is received on original
* command (auto-sense) */
/* Low-level done function - can be used by low-level driver to point
* to completion function. Not used by mid/upper level code. */
void (*scsi_done) (struct scsi_cmnd *);
/*
* The following fields can be written to by the host specific code.
* Everything else should be left alone.
*/
struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
-
--[[linux-2.6.25/scsi_pointer]]
unsigned char *host_scribble; /* The host adapter is allowed to
* call scsi_malloc and get some memory
* and hang it here. The host adapter
* is also expected to call scsi_free
* to release this memory. (The memory
* obtained by scsi_malloc is guaranteed
* to be at an address < 16Mb). */
int result; /* Status code from lower level driver */
unsigned char tag; /* SCSI-II queued command tag */
};
*コメント [#r830dc17]
#comment
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