block: add block polling support

[cascardo/linux.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 19c2e94..3fe27f8 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -35,6 +35,7 @@ struct sg_io_hdr;
 struct bsg_job;
 struct blkcg_gq;
 struct blk_flush_queue;
+struct pr_ops;
 
 #define BLKDEV_MIN_RQ  4
 #define BLKDEV_MAX_RQ  128     /* Default maximum */
@@ -208,7 +209,7 @@ static inline unsigned short req_get_ioprio(struct request *req)
 struct blk_queue_ctx;
 
 typedef void (request_fn_proc) (struct request_queue *q);
-typedef void (make_request_fn) (struct request_queue *q, struct bio *bio);
+typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
 typedef int (prep_rq_fn) (struct request_queue *, struct request *);
 typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
 
@@ -369,6 +370,10 @@ struct request_queue {
         */
        struct kobject mq_kobj;
 
+#ifdef  CONFIG_BLK_DEV_INTEGRITY
+       struct blk_integrity integrity;
+#endif /* CONFIG_BLK_DEV_INTEGRITY */
+
 #ifdef CONFIG_PM
        struct device           *dev;
        int                     rpm_status;
@@ -450,7 +455,7 @@ struct request_queue {
 #endif
        struct rcu_head         rcu_head;
        wait_queue_head_t       mq_freeze_wq;
-       struct percpu_ref       mq_usage_counter;
+       struct percpu_ref       q_usage_counter;
        struct list_head        all_q_node;
 
        struct blk_mq_tag_set   *tag_set;
@@ -482,6 +487,7 @@ struct request_queue {
 #define QUEUE_FLAG_DEAD        19      /* queue tear-down finished */
 #define QUEUE_FLAG_INIT_DONE   20      /* queue is initialized */
 #define QUEUE_FLAG_NO_SG_MERGE 21      /* don't attempt to merge SG segments*/
+#define QUEUE_FLAG_POLL               22       /* IO polling enabled if set */
 
 #define QUEUE_FLAG_DEFAULT     ((1 << QUEUE_FLAG_IO_STAT) |            \
                                 (1 << QUEUE_FLAG_STACKABLE)    |       \
@@ -756,7 +762,7 @@ static inline void rq_flush_dcache_pages(struct request *rq)
 
 extern int blk_register_queue(struct gendisk *disk);
 extern void blk_unregister_queue(struct gendisk *disk);
-extern void generic_make_request(struct bio *bio);
+extern blk_qc_t generic_make_request(struct bio *bio);
 extern void blk_rq_init(struct request_queue *q, struct request *rq);
 extern void blk_put_request(struct request *);
 extern void __blk_put_request(struct request_queue *, struct request *);
@@ -809,6 +815,8 @@ extern int blk_execute_rq(struct request_queue *, struct gendisk *,
 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
                                  struct request *, int, rq_end_io_fn *);
 
+bool blk_poll(struct request_queue *q, blk_qc_t cookie);
+
 static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
 {
        return bdev->bd_disk->queue;    /* this is never NULL */
@@ -1462,22 +1470,13 @@ struct blk_integrity_iter {
 
 typedef int (integrity_processing_fn) (struct blk_integrity_iter *);
 
-struct blk_integrity {
-       integrity_processing_fn *generate_fn;
-       integrity_processing_fn *verify_fn;
-
-       unsigned short          flags;
-       unsigned short          tuple_size;
-       unsigned short          interval;
-       unsigned short          tag_size;
-
-       const char              *name;
-
-       struct kobject          kobj;
+struct blk_integrity_profile {
+       integrity_processing_fn         *generate_fn;
+       integrity_processing_fn         *verify_fn;
+       const char                      *name;
 };
 
-extern bool blk_integrity_is_initialized(struct gendisk *);
-extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
+extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
 extern void blk_integrity_unregister(struct gendisk *);
 extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
@@ -1488,15 +1487,20 @@ extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
                                    struct bio *);
 
-static inline
-struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
 {
-       return bdev->bd_disk->integrity;
+       struct blk_integrity *bi = &disk->queue->integrity;
+
+       if (!bi->profile)
+               return NULL;
+
+       return bi;
 }
 
-static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
+static inline
+struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
 {
-       return disk->integrity;
+       return blk_get_integrity(bdev->bd_disk);
 }
 
 static inline bool blk_integrity_rq(struct request *rq)
@@ -1570,10 +1574,9 @@ static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
 {
        return 0;
 }
-static inline int blk_integrity_register(struct gendisk *d,
+static inline void blk_integrity_register(struct gendisk *d,
                                         struct blk_integrity *b)
 {
-       return 0;
 }
 static inline void blk_integrity_unregister(struct gendisk *d)
 {
@@ -1598,10 +1601,7 @@ static inline bool blk_integrity_merge_bio(struct request_queue *rq,
 {
        return true;
 }
-static inline bool blk_integrity_is_initialized(struct gendisk *g)
-{
-       return 0;
-}
+
 static inline bool integrity_req_gap_back_merge(struct request *req,
                                                struct bio *next)
 {
@@ -1633,6 +1633,7 @@ struct block_device_operations {
        /* this callback is with swap_lock and sometimes page table lock held */
        void (*swap_slot_free_notify) (struct block_device *, unsigned long);
        struct module *owner;
+       const struct pr_ops *pr_ops;
 };
 
 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,