[SCSI] implement scsi_data_buffer

[linux-2.6] / include / scsi / scsi_cmnd.h

diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 7613c29893703bc52cf532f9ad1896e3444a904d..c6478bb6f963b9d5f626b4d735728d91021cb9b6 100644 (file)
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -8,10 +8,14 @@
 #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 {
@@ -34,7 +38,6 @@ struct scsi_cmnd {
        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
@@ -63,15 +66,11 @@ struct scsi_cmnd {
        /* 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 __use_sg;
-
+       struct scsi_data_buffer sdb;
        unsigned underflow;     /* Return error if less than
                                   this amount is transferred */
 
@@ -81,15 +80,11 @@ struct scsi_cmnd {
                                   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) */
@@ -122,7 +117,6 @@ extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, 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);
 
@@ -130,24 +124,35 @@ extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
                                 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 scsi_cmnd *);
+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)                   \