#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/types.h>
+#include <linux/timer.h>
struct request;
struct scatterlist;
int sc_magic;
struct scsi_device *device;
- unsigned short state;
- unsigned short owner;
struct scsi_request *sc_request;
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
- int eh_state; /* Used for state tracking in error handlr */
int eh_eflags; /* Used by error handlr */
void (*done) (struct scsi_cmnd *); /* Mid-level done function */
/*
- * A SCSI Command is assigned a nonzero serial_number when internal_cmnd
- * passes it to the driver's queue command function. The serial_number
- * is cleared when scsi_done is entered indicating that the command has
- * been completed. If a timeout occurs, the serial number at the moment
- * of timeout is copied into serial_number_at_timeout. By subsequently
- * comparing the serial_number and serial_number_at_timeout fields
- * during abort or reset processing, we can detect whether the command
- * has already completed. This also detects cases where the command has
- * completed and the SCSI Command structure has already being reused
- * for another command, so that we can avoid incorrectly aborting or
- * resetting the new command.
+ * 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 currently doesn't have much use other
+ * than printk's. Some lldd's use this number for other purposes.
+ * It's almost certain that such usages are either incorrect or
+ * meaningless. Please kill all usages other than printk's. Also,
+ * as this number is always identical to ->pid, please convert
+ * printk's to use ->pid, so that we can kill this field.
*/
unsigned long serial_number;
- unsigned long serial_number_at_timeout;
+ /*
+ * 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;
- int timeout_total;
- int timeout;
-
- /*
- * We handle the timeout differently if it happens when a reset,
- * abort, etc are in process.
- */
- unsigned volatile char internal_timeout;
unsigned char cmd_len;
unsigned char old_cmd_len;
* sense info */
unsigned short use_sg; /* Number of pieces of scatter-gather */
unsigned short sglist_len; /* size of malloc'd scatter-gather list */
- unsigned short abort_reason; /* If the mid-level code requests an
- * abort, this is the reason. */
unsigned bufflen; /* Size of data buffer */
void *buffer; /* Data buffer */
working on */
#define SCSI_SENSE_BUFFERSIZE 96
- unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE]; /* obtained by REQUEST SENSE
- * when CHECK CONDITION is
- * received on original command
- * (auto-sense) */
+ unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
+ /* 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. */
struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
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). */
+ * 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 */
- unsigned long pid; /* Process ID, starts at 0 */
+ unsigned long pid; /* Process ID, starts at 0. Unique per host. */
};
/*
#define SCSI_STATE_MLQUEUE 0x100b
-extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, int);
+extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void scsi_io_completion(struct scsi_cmnd *, unsigned int, unsigned int);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
git://git.onelab.eu / linux-2.6.git / blobdiff