block: rename generic_make_request to submit_bio_noacct

generic_make_request has always been very confusingly misnamed, so rename
it to submit_bio_noacct to make it clear that it is submit_bio minus
accounting and a few checks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/bio.c

@@ -358,7 +358,7 @@ static void bio_alloc_rescue(struct work_struct *work)
 		if (!bio)
 			break;
 
-		generic_make_request(bio);
+		submit_bio_noacct(bio);
 	}
 }
 
@@ -416,19 +416,19 @@ static void punt_bios_to_rescuer(struct bio_set *bs)
  *   submit the previously allocated bio for IO before attempting to allocate
  *   a new one. Failure to do so can cause deadlocks under memory pressure.
  *
- *   Note that when running under generic_make_request() (i.e. any block
+ *   Note that when running under submit_bio_noacct() (i.e. any block
  *   driver), bios are not submitted until after you return - see the code in
- *   generic_make_request() that converts recursion into iteration, to prevent
+ *   submit_bio_noacct() that converts recursion into iteration, to prevent
  *   stack overflows.
  *
  *   This would normally mean allocating multiple bios under
- *   generic_make_request() would be susceptible to deadlocks, but we have
+ *   submit_bio_noacct() would be susceptible to deadlocks, but we have
  *   deadlock avoidance code that resubmits any blocked bios from a rescuer
  *   thread.
  *
  *   However, we do not guarantee forward progress for allocations from other
  *   mempools. Doing multiple allocations from the same mempool under
- *   generic_make_request() should be avoided - instead, use bio_set's front_pad
+ *   submit_bio_noacct() should be avoided - instead, use bio_set's front_pad
  *   for per bio allocations.
  *
  *   RETURNS:
@@ -457,14 +457,14 @@ struct bio *bio_alloc_bioset(gfp_t gfp_mask, unsigned int nr_iovecs,
 				 nr_iovecs > 0))
 			return NULL;
 		/*
-		 * generic_make_request() converts recursion to iteration; this
+		 * submit_bio_noacct() converts recursion to iteration; this
 		 * means if we're running beneath it, any bios we allocate and
 		 * submit will not be submitted (and thus freed) until after we
 		 * return.
 		 *
 		 * This exposes us to a potential deadlock if we allocate
 		 * multiple bios from the same bio_set() while running
-		 * underneath generic_make_request(). If we were to allocate
+		 * underneath submit_bio_noacct(). If we were to allocate
 		 * multiple bios (say a stacking block driver that was splitting
 		 * bios), we would deadlock if we exhausted the mempool's
 		 * reserve.

block/blk-core.c

@@ -956,8 +956,7 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
 	return BLK_STS_OK;
 }
 
-static noinline_for_stack bool
-generic_make_request_checks(struct bio *bio)
+static noinline_for_stack bool submit_bio_checks(struct bio *bio)
 {
 	struct request_queue *q = bio->bi_disk->queue;
 	blk_status_t status = BLK_STS_IOERR;
@@ -985,9 +984,8 @@ generic_make_request_checks(struct bio *bio)
 	}
 
 	/*
-	 * Filter flush bio's early so that make_request based
-	 * drivers without flush support don't have to worry
-	 * about them.
+	 * Filter flush bio's early so that bio based drivers without flush
+	 * support don't have to worry about them.
 	 */
 	if (op_is_flush(bio->bi_opf) &&
 	    !test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
@@ -1072,7 +1070,7 @@ end_io:
 	return false;
 }
 
-static blk_qc_t do_make_request(struct bio *bio)
+static blk_qc_t __submit_bio(struct bio *bio)
 {
 	struct gendisk *disk = bio->bi_disk;
 	blk_qc_t ret = BLK_QC_T_NONE;
@@ -1087,7 +1085,7 @@ static blk_qc_t do_make_request(struct bio *bio)
 }
 
 /**
- * generic_make_request - re-submit a bio to the block device layer for I/O
+ * submit_bio_noacct - re-submit a bio to the block device layer for I/O
  * @bio:  The bio describing the location in memory and on the device.
  *
  * This is a version of submit_bio() that shall only be used for I/O that is
@@ -1095,7 +1093,7 @@ static blk_qc_t do_make_request(struct bio *bio)
  * systems and other upper level users of the block layer should use
  * submit_bio() instead.
  */
-blk_qc_t generic_make_request(struct bio *bio)
+blk_qc_t submit_bio_noacct(struct bio *bio)
 {
 	/*
 	 * bio_list_on_stack[0] contains bios submitted by the current
@@ -1106,7 +1104,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 	struct bio_list bio_list_on_stack[2];
 	blk_qc_t ret = BLK_QC_T_NONE;
 
-	if (!generic_make_request_checks(bio))
+	if (!submit_bio_checks(bio))
 		goto out;
 
 	/*
@@ -1114,7 +1112,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 	 * stack usage with stacked devices could be a problem.  So use
 	 * current->bio_list to keep a list of requests submited by a
 	 * ->submit_bio method.  current->bio_list is also used as a
-	 * flag to say if generic_make_request is currently active in this
+	 * flag to say if submit_bio_noacct is currently active in this
 	 * task or not.  If it is NULL, then no make_request is active.  If
 	 * it is non-NULL, then a make_request is active, and new requests
 	 * should be added at the tail
@@ -1132,7 +1130,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 	 * we assign bio_list to a pointer to the bio_list_on_stack,
 	 * thus initialising the bio_list of new bios to be
 	 * added.  ->submit_bio() may indeed add some more bios
-	 * through a recursive call to generic_make_request.  If it
+	 * through a recursive call to submit_bio_noacct.  If it
 	 * did, we find a non-NULL value in bio_list and re-enter the loop
 	 * from the top.  In this case we really did just take the bio
 	 * of the top of the list (no pretending) and so remove it from
@@ -1150,7 +1148,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 			/* Create a fresh bio_list for all subordinate requests */
 			bio_list_on_stack[1] = bio_list_on_stack[0];
 			bio_list_init(&bio_list_on_stack[0]);
-			ret = do_make_request(bio);
+			ret = __submit_bio(bio);
 
 			/* sort new bios into those for a lower level
 			 * and those for the same level
@@ -1174,13 +1172,13 @@ blk_qc_t generic_make_request(struct bio *bio)
 out:
 	return ret;
 }
-EXPORT_SYMBOL(generic_make_request);
+EXPORT_SYMBOL(submit_bio_noacct);
 
 /**
  * direct_make_request - hand a buffer directly to its device driver for I/O
  * @bio:  The bio describing the location in memory and on the device.
  *
- * This function behaves like generic_make_request(), but does not protect
+ * This function behaves like submit_bio_noacct(), but does not protect
  * against recursion.  Must only be used if the called driver is known
  * to be blk-mq based.
  */
@@ -1192,7 +1190,7 @@ blk_qc_t direct_make_request(struct bio *bio)
 		bio_io_error(bio);
 		return BLK_QC_T_NONE;
 	}
-	if (!generic_make_request_checks(bio))
+	if (!submit_bio_checks(bio))
 		return BLK_QC_T_NONE;
 	if (unlikely(bio_queue_enter(bio)))
 		return BLK_QC_T_NONE;
@@ -1263,13 +1261,13 @@ blk_qc_t submit_bio(struct bio *bio)
 		blk_qc_t ret;
 
 		psi_memstall_enter(&pflags);
-		ret = generic_make_request(bio);
+		ret = submit_bio_noacct(bio);
 		psi_memstall_leave(&pflags);
 
 		return ret;
 	}
 
-	return generic_make_request(bio);
+	return submit_bio_noacct(bio);
 }
 EXPORT_SYMBOL(submit_bio);
 

block/blk-crypto-fallback.c

@@ -228,7 +228,7 @@ static bool blk_crypto_split_bio_if_needed(struct bio **bio_ptr)
 			return false;
 		}
 		bio_chain(split_bio, bio);
-		generic_make_request(bio);
+		submit_bio_noacct(bio);
 		*bio_ptr = split_bio;
 	}
 

block/blk-crypto.c

@@ -239,7 +239,7 @@ void __blk_crypto_free_request(struct request *rq)
  * kernel crypto API. When the crypto API fallback is used for encryption,
  * blk-crypto may choose to split the bio into 2 - the first one that will
  * continue to be processed and the second one that will be resubmitted via
- * generic_make_request. A bounce bio will be allocated to encrypt the contents
+ * submit_bio_noacct. A bounce bio will be allocated to encrypt the contents
  * of the aforementioned "first one", and *bio_ptr will be updated to this
  * bounce bio.
  *

block/blk-merge.c

@@ -338,7 +338,7 @@ void __blk_queue_split(struct bio **bio, unsigned int *nr_segs)
 
 		bio_chain(split, *bio);
 		trace_block_split(q, split, (*bio)->bi_iter.bi_sector);
-		generic_make_request(*bio);
+		submit_bio_noacct(*bio);
 		*bio = split;
 	}
 }

block/blk-throttle.c

@@ -1339,8 +1339,8 @@ static void blk_throtl_dispatch_work_fn(struct work_struct *work)
 
 	if (!bio_list_empty(&bio_list_on_stack)) {
 		blk_start_plug(&plug);
-		while((bio = bio_list_pop(&bio_list_on_stack)))
-			generic_make_request(bio);
+		while ((bio = bio_list_pop(&bio_list_on_stack)))
+			submit_bio_noacct(bio);
 		blk_finish_plug(&plug);
 	}
 }

block/bounce.c

@@ -309,7 +309,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 	if (!passthrough && sectors < bio_sectors(*bio_orig)) {
 		bio = bio_split(*bio_orig, sectors, GFP_NOIO, &bounce_bio_split);
 		bio_chain(bio, *bio_orig);
-		generic_make_request(*bio_orig);
+		submit_bio_noacct(*bio_orig);
 		*bio_orig = bio;
 	}
 	bio = bounce_clone_bio(*bio_orig, GFP_NOIO, passthrough ? NULL :