#define _SCSI_SCSI_CMND_H
#include <linux/dma-mapping.h>
+#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/timer.h>
+#include <linux/scatterlist.h>
-struct request;
-struct scatterlist;
struct Scsi_Host;
struct scsi_device;
+struct scsi_data_buffer {
+ struct sg_table table;
+ unsigned length;
+ int resid;
+};
/* embedded in scsi_cmnd */
struct scsi_pointer {
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 */
- void (*done) (struct scsi_cmnd *); /* Mid-level done function */
/*
* 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.
+ * 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
/* These elements define the operation we are about to perform */
#define MAX_COMMAND_SIZE 16
unsigned char cmnd[MAX_COMMAND_SIZE];
- unsigned request_bufflen; /* Actual request size */
struct timer_list eh_timeout; /* Used to time out the command. */
- void *request_buffer; /* Actual requested buffer */
/* These elements define the operation we ultimately want to perform */
- unsigned short use_sg; /* Number of pieces of scatter-gather */
- unsigned short sglist_len; /* size of malloc'd scatter-gather list */
-
+ struct scsi_data_buffer sdb;
unsigned underflow; /* Return error if less than
this amount is transferred */
reconnects. Probably == sector
size */
- int resid; /* Number of bytes requested to be
- transferred less actual number
- transferred (0 if not supported) */
-
struct request *request; /* The command we are
working on */
#define SCSI_SENSE_BUFFERSIZE 96
- unsigned char sense_buffer[SCSI_SENSE_BUFFERSIZE];
+ unsigned char *sense_buffer;
/* obtained by REQUEST SENSE when
* CHECK CONDITION is received on original
* command (auto-sense) */
int result; /* Status code from lower level driver */
unsigned char tag; /* SCSI-II queued command tag */
- unsigned long pid; /* Process ID, starts at 0. Unique per host. */
};
extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
extern void scsi_put_command(struct scsi_cmnd *);
extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
struct device *);
-extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);
extern void scsi_finish_command(struct scsi_cmnd *cmd);
extern void scsi_req_abort_cmd(struct scsi_cmnd *cmd);
size_t *offset, size_t *len);
extern void scsi_kunmap_atomic_sg(void *virt);
-extern struct scatterlist *scsi_alloc_sgtable(struct scsi_cmnd *, gfp_t);
-extern void scsi_free_sgtable(struct scatterlist *, int);
+extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
+extern void scsi_release_buffers(struct scsi_cmnd *cmd);
extern int scsi_dma_map(struct scsi_cmnd *cmd);
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
-#define scsi_sg_count(cmd) ((cmd)->use_sg)
-#define scsi_sglist(cmd) ((struct scatterlist *)(cmd)->request_buffer)
-#define scsi_bufflen(cmd) ((cmd)->request_bufflen)
+static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
+{
+ return cmd->sdb.table.nents;
+}
+
+static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
+{
+ return cmd->sdb.table.sgl;
+}
+
+static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
+{
+ return cmd->sdb.length;
+}
static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
{
- cmd->resid = resid;
+ cmd->sdb.resid = resid;
}
static inline int scsi_get_resid(struct scsi_cmnd *cmd)
{
- return cmd->resid;
+ return cmd->sdb.resid;
}
#define scsi_for_each_sg(cmd, sg, nseg, __i) \
- for (__i = 0, sg = scsi_sglist(cmd); __i < (nseg); __i++, (sg)++)
+ for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
+
+static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
+{
+ return blk_bidi_rq(cmd->request) &&
+ (cmd->request->next_rq->special != NULL);
+}
+
+static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
+{
+ return scsi_bidi_cmnd(cmd) ?
+ cmd->request->next_rq->special : &cmd->sdb;
+}
+
+static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
+{
+ return &cmd->sdb;
+}
#endif /* _SCSI_SCSI_CMND_H */
git.samba.org / sfrench / cifs-2.6.git / blobdiff