block: change ->make_request_fn() and users to return a queue cookie

[cascardo/linux.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index 89eec79..e93df6d 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -809,7 +809,7 @@ blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id)
 }
 EXPORT_SYMBOL(blk_init_queue_node);
 
-static void blk_queue_bio(struct request_queue *q, struct bio *bio);
+static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio);
 
 struct request_queue *
 blk_init_allocated_queue(struct request_queue *q, request_fn_proc *rfn,
@@ -1678,7 +1678,7 @@ void init_request_from_bio(struct request *req, struct bio *bio)
        blk_rq_bio_prep(req->q, req, bio);
 }
 
-static void blk_queue_bio(struct request_queue *q, struct bio *bio)
+static blk_qc_t blk_queue_bio(struct request_queue *q, struct bio *bio)
 {
        const bool sync = !!(bio->bi_rw & REQ_SYNC);
        struct blk_plug *plug;
@@ -1698,7 +1698,7 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio)
        if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
                bio->bi_error = -EIO;
                bio_endio(bio);
-               return;
+               return BLK_QC_T_NONE;
        }
 
        if (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) {
@@ -1713,7 +1713,7 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio)
         */
        if (!blk_queue_nomerges(q)) {
                if (blk_attempt_plug_merge(q, bio, &request_count, NULL))
-                       return;
+                       return BLK_QC_T_NONE;
        } else
                request_count = blk_plug_queued_count(q);
 
@@ -1791,6 +1791,8 @@ get_rq:
 out_unlock:
                spin_unlock_irq(q->queue_lock);
        }
+
+       return BLK_QC_T_NONE;
 }
 
 /*
@@ -1996,12 +1998,13 @@ end_io:
  * a lower device by calling into generic_make_request recursively, which
  * means the bio should NOT be touched after the call to ->make_request_fn.
  */
-void generic_make_request(struct bio *bio)
+blk_qc_t generic_make_request(struct bio *bio)
 {
        struct bio_list bio_list_on_stack;
+       blk_qc_t ret = BLK_QC_T_NONE;
 
        if (!generic_make_request_checks(bio))
-               return;
+               goto out;
 
        /*
         * We only want one ->make_request_fn to be active at a time, else
@@ -2015,7 +2018,7 @@ void generic_make_request(struct bio *bio)
         */
        if (current->bio_list) {
                bio_list_add(current->bio_list, bio);
-               return;
+               goto out;
        }
 
        /* following loop may be a bit non-obvious, and so deserves some
@@ -2040,7 +2043,7 @@ void generic_make_request(struct bio *bio)
 
                if (likely(blk_queue_enter(q, __GFP_WAIT) == 0)) {
 
-                       q->make_request_fn(q, bio);
+                       ret = q->make_request_fn(q, bio);
 
                        blk_queue_exit(q);
 
@@ -2053,6 +2056,9 @@ void generic_make_request(struct bio *bio)
                }
        } while (bio);
        current->bio_list = NULL; /* deactivate */
+
+out:
+       return ret;
 }
 EXPORT_SYMBOL(generic_make_request);
 
@@ -2066,7 +2072,7 @@ EXPORT_SYMBOL(generic_make_request);
  * interfaces; @bio must be presetup and ready for I/O.
  *
  */
-void submit_bio(int rw, struct bio *bio)
+blk_qc_t submit_bio(int rw, struct bio *bio)
 {
        bio->bi_rw |= rw;
 
@@ -2100,7 +2106,7 @@ void submit_bio(int rw, struct bio *bio)
                }
        }
 
-       generic_make_request(bio);
+       return generic_make_request(bio);
 }
 EXPORT_SYMBOL(submit_bio);