2 files changed, 95 insertions, 1 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index fae138bd2207..b32564a1e105 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -14,6 +14,7 @@
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/stringify.h>
+#include <linux/bsg.h>
 
 #include <asm/scatterlist.h>
 
@@ -41,6 +42,8 @@ struct elevator_queue;
 typedef struct elevator_queue elevator_t;
 struct request_pm_state;
 struct blk_trace;
+struct request;
+struct sg_io_hdr;
 
 #define BLKDEV_MIN_RQ   4
 #define BLKDEV_MAX_RQ   128     /* Default maximum */
@@ -314,6 +317,9 @@ struct request {
          */
         rq_end_io_fn *end_io;
         void *end_io_data;
+
+        /* for bidi */
+        struct request *next_rq;
 };
 
 /*
@@ -468,6 +474,10 @@ struct request_queue
         unsigned int            bi_size;
 
         struct mutex            sysfs_lock;
+
+#if defined(CONFIG_BLK_DEV_BSG)
+        struct bsg_class_device bsg_dev;
+#endif
 };
 
 #define QUEUE_FLAG_CLUSTER      0       /* cluster several segments into 1 */
@@ -479,6 +489,7 @@ struct request_queue
 #define QUEUE_FLAG_REENTER      6       /* Re-entrancy avoidance */
 #define QUEUE_FLAG_PLUGGED      7       /* queue is plugged */
 #define QUEUE_FLAG_ELVSWITCH    8       /* don't use elevator, just do FIFO */
+#define QUEUE_FLAG_BIDI         9       /* queue supports bidi requests */
 
 enum {
         /*
@@ -543,6 +554,7 @@ enum {
 #define blk_sorted_rq(rq)       ((rq)->cmd_flags & REQ_SORTED)
 #define blk_barrier_rq(rq)      ((rq)->cmd_flags & REQ_HARDBARRIER)
 #define blk_fua_rq(rq)          ((rq)->cmd_flags & REQ_FUA)
+#define blk_bidi_rq(rq)         ((rq)->next_rq != NULL)
 
 #define list_entry_rq(ptr)      list_entry((ptr), struct request, queuelist)
 
@@ -607,6 +619,11 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
 #define BLK_BOUNCE_ANY          ((u64)blk_max_pfn << PAGE_SHIFT)
 #define BLK_BOUNCE_ISA          (ISA_DMA_THRESHOLD)
 
+/*
+ * default timeout for SG_IO if none specified
+ */
+#define BLK_DEFAULT_SG_TIMEOUT  (60 * HZ)
+
 #ifdef CONFIG_MMU
 extern int init_emergency_isa_pool(void);
 extern void blk_queue_bounce(request_queue_t *q, struct bio **bio);
@@ -637,7 +654,8 @@ extern void blk_requeue_request(request_queue_t *, struct request *);
 extern void blk_plug_device(request_queue_t *);
 extern int blk_remove_plug(request_queue_t *);
 extern void blk_recount_segments(request_queue_t *, struct bio *);
-extern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *);
+extern int scsi_cmd_ioctl(struct file *, struct request_queue *,
+                          struct gendisk *, unsigned int, void __user *);
 extern int sg_scsi_ioctl(struct file *, struct request_queue *,
                 struct gendisk *, struct scsi_ioctl_command __user *);
 
@@ -680,6 +698,12 @@ extern int blk_execute_rq(request_queue_t *, struct gendisk *,
                           struct request *, int);
 extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *,
                                   struct request *, int, rq_end_io_fn *);
+extern int blk_fill_sghdr_rq(request_queue_t *, struct request *,
+                      struct sg_io_hdr *, int);
+extern int blk_unmap_sghdr_rq(struct request *, struct sg_io_hdr *);
+extern int blk_complete_sghdr_rq(struct request *, struct sg_io_hdr *,
+                          struct bio *);
+extern int blk_verify_command(unsigned char *, int);
 
 static inline request_queue_t *bdev_get_queue(struct block_device *bdev)
 {
diff --git a/include/linux/bsg.h b/include/linux/bsg.h
new file mode 100644
index 000000000000..bd998ca6cb2e
--- /dev/null
+++ b/include/linux/bsg.h
@@ -0,0 +1,70 @@
+#ifndef BSG_H
+#define BSG_H
+
+#define BSG_PROTOCOL_SCSI               0
+
+#define BSG_SUB_PROTOCOL_SCSI_CMD       0
+#define BSG_SUB_PROTOCOL_SCSI_TMF       1
+#define BSG_SUB_PROTOCOL_SCSI_TRANSPORT 2
+
+struct sg_io_v4 {
+        __s32 guard;            /* [i] 'Q' to differentiate from v3 */
+        __u32 protocol;         /* [i] 0 -> SCSI , .... */
+        __u32 subprotocol;      /* [i] 0 -> SCSI command, 1 -> SCSI task
+                                   management function, .... */
+
+        __u32 request_len;      /* [i] in bytes */
+        __u64 request;          /* [i], [*i] {SCSI: cdb} */
+        __u32 request_attr;     /* [i] {SCSI: task attribute} */
+        __u32 request_tag;      /* [i] {SCSI: task tag (only if flagged)} */
+        __u32 request_priority; /* [i] {SCSI: task priority} */
+        __u32 max_response_len; /* [i] in bytes */
+        __u64 response;         /* [i], [*o] {SCSI: (auto)sense data} */
+
+        /* "din_" for data in (from device); "dout_" for data out (to device) */
+        __u32 dout_xfer_len;    /* [i] bytes to be transferred to device */
+        __u32 din_xfer_len;     /* [i] bytes to be transferred from device */
+        __u64 dout_xferp;       /* [i], [*i] */
+        __u64 din_xferp;        /* [i], [*o] */
+
+        __u32 timeout;          /* [i] units: millisecond */
+        __u32 flags;            /* [i] bit mask */
+        __u64 usr_ptr;          /* [i->o] unused internally */
+        __u32 spare_in;         /* [i] */
+
+        __u32 driver_status;    /* [o] 0 -> ok */
+        __u32 transport_status; /* [o] 0 -> ok */
+        __u32 device_status;    /* [o] {SCSI: command completion status} */
+        __u32 retry_delay;      /* [o] {SCSI: status auxiliary information} */
+        __u32 info;             /* [o] additional information */
+        __u32 duration;         /* [o] time to complete, in milliseconds */
+        __u32 response_len;     /* [o] bytes of response actually written */
+        __s32 din_resid;        /* [o] actual_din_xfer_len - din_xfer_len */
+        __u32 generated_tag;    /* [o] {SCSI: task tag that transport chose} */
+        __u32 spare_out;        /* [o] */
+
+        __u32 padding;
+};
+
+#ifdef __KERNEL__
+
+#if defined(CONFIG_BLK_DEV_BSG)
+struct bsg_class_device {
+        struct class_device *class_dev;
+        struct device *dev;
+        int minor;
+        struct list_head list;
+        struct request_queue *queue;
+};
+
+extern int bsg_register_queue(struct request_queue *, const char *);
+extern void bsg_unregister_queue(struct request_queue *);
+#else
+struct bsg_class_device { };
+#define bsg_register_queue(disk, name)          (0)
+#define bsg_unregister_queue(disk)      do { } while (0)
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif