bsg: support for full generic block layer SG v3

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

3 files changed, 35 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index fae138bd2207..53002d40efa2 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -41,6 +41,8 @@ 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 */
@@ -607,6 +609,11 @@ 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);
@@ -680,6 +687,11 @@ 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 *);
 
 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..dc0d7282c4cb
--- /dev/null
+++ b/include/linux/bsg.h
@@ -0,0 +1,21 @@
+#ifndef BSG_H
+#define BSG_H
+
+#if defined(CONFIG_BLK_DEV_BSG)
+struct bsg_class_device {
+        struct class_device *class_dev;
+        struct device *dev;
+        int minor;
+        struct gendisk *disk;
+        struct list_head list;
+};
+
+extern int bsg_register_disk(struct gendisk *);
+extern void bsg_unregister_disk(struct gendisk *);
+#else
+struct bsg_class_device { };
+#define bsg_register_disk(disk)         (0)
+#define bsg_unregister_disk(disk)       do { } while (0)
+#endif
+
+#endif
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 9756fc102a83..8c43d7032612 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -67,6 +67,7 @@ struct partition {
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/workqueue.h>
+#include <linux/bsg.h>
 
 struct partition {
         unsigned char boot_ind;         /* 0x80 - active */
@@ -91,6 +92,7 @@ struct hd_struct {
 #ifdef CONFIG_FAIL_MAKE_REQUEST
         int make_it_fail;
 #endif
+        struct bsg_class_device bsg_dev;
 };
 
 #define GENHD_FL_REMOVABLE                      1