block: move elevator.h to block/

Except for the features passed to blk_queue_required_elevator_features,
elevator.h is only needed internally to the block layer.  Move the
ELEVATOR_F_* definitions to blkdev.h, and the move elevator.h to
block/, dropping all the spurious includes outside of that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210920123328.1399408-13-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/bfq-cgroup.c

@@ -6,13 +6,13 @@
 #include <linux/slab.h>
 #include <linux/blkdev.h>
 #include <linux/cgroup.h>
-#include <linux/elevator.h>
 #include <linux/ktime.h>
 #include <linux/rbtree.h>
 #include <linux/ioprio.h>
 #include <linux/sbitmap.h>
 #include <linux/delay.h>
 
+#include "elevator.h"
 #include "bfq-iosched.h"
 
 #ifdef CONFIG_BFQ_CGROUP_DEBUG

block/bfq-iosched.c

@@ -117,7 +117,6 @@
 #include <linux/slab.h>
 #include <linux/blkdev.h>
 #include <linux/cgroup.h>
-#include <linux/elevator.h>
 #include <linux/ktime.h>
 #include <linux/rbtree.h>
 #include <linux/ioprio.h>
@@ -127,6 +126,7 @@
 
 #include <trace/events/block.h>
 
+#include "elevator.h"
 #include "blk.h"
 #include "blk-mq.h"
 #include "blk-mq-tag.h"

block/blk-mq-sched.h

@@ -2,6 +2,7 @@
 #ifndef BLK_MQ_SCHED_H
 #define BLK_MQ_SCHED_H
 
+#include "elevator.h"
 #include "blk-mq.h"
 #include "blk-mq-tag.h"
 

block/blk-mq-tag.h

@@ -2,6 +2,8 @@
 #ifndef INT_BLK_MQ_TAG_H
 #define INT_BLK_MQ_TAG_H
 
+struct blk_mq_alloc_data;
+
 /*
  * Tag address space map.
  */

block/blk.h

@@ -12,6 +12,8 @@
 #include "blk-mq.h"
 #include "blk-mq-sched.h"
 
+struct elevator_type;
+
 /* Max future timer expiry for timeouts */
 #define BLK_MAX_TIMEOUT		(5 * HZ)
 

block/elevator.c

@@ -26,7 +26,6 @@
 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/blkdev.h>
-#include <linux/elevator.h>
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -40,6 +39,7 @@
 
 #include <trace/events/block.h>
 
+#include "elevator.h"
 #include "blk.h"
 #include "blk-mq-sched.h"
 #include "blk-pm.h"

block/elevator.h

@@ -1,17 +1,13 @@
 /* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _LINUX_ELEVATOR_H
-#define _LINUX_ELEVATOR_H
+#ifndef _ELEVATOR_H
+#define _ELEVATOR_H
 
 #include <linux/percpu.h>
 #include <linux/hashtable.h>
 
-#ifdef CONFIG_BLOCK
-
 struct io_cq;
 struct elevator_type;
-#ifdef CONFIG_BLK_DEBUG_FS
 struct blk_mq_debugfs_attr;
-#endif
 
 /*
  * Return values from elevator merger
@@ -167,14 +163,4 @@ extern struct request *elv_rb_find(struct rb_root *, sector_t);
 #define rq_entry_fifo(ptr)	list_entry((ptr), struct request, queuelist)
 #define rq_fifo_clear(rq)	list_del_init(&(rq)->queuelist)
 
-/*
- * Elevator features.
- */
-
-/* Supports zoned block devices sequential write constraint */
-#define ELEVATOR_F_ZBD_SEQ_WRITE	(1U << 0)
-/* Supports scheduling on multiple hardware queues */
-#define ELEVATOR_F_MQ_AWARE		(1U << 1)
-
-#endif /* CONFIG_BLOCK */
-#endif
+#endif /* _ELEVATOR_H */

block/kyber-iosched.c

@@ -9,12 +9,12 @@
 #include <linux/kernel.h>
 #include <linux/blkdev.h>
 #include <linux/blk-mq.h>
-#include <linux/elevator.h>
 #include <linux/module.h>
 #include <linux/sbitmap.h>
 
 #include <trace/events/block.h>
 
+#include "elevator.h"
 #include "blk.h"
 #include "blk-mq.h"
 #include "blk-mq-debugfs.h"

block/mq-deadline.c

@@ -9,7 +9,6 @@
 #include <linux/fs.h>
 #include <linux/blkdev.h>
 #include <linux/blk-mq.h>
-#include <linux/elevator.h>
 #include <linux/bio.h>
 #include <linux/module.h>
 #include <linux/slab.h>
@@ -20,6 +19,7 @@
 
 #include <trace/events/block.h>
 
+#include "elevator.h"
 #include "blk.h"
 #include "blk-mq.h"
 #include "blk-mq-debugfs.h"

drivers/block/amiflop.c

@@ -64,7 +64,6 @@
 #include <linux/mutex.h>
 #include <linux/fs.h>
 #include <linux/blk-mq.h>
-#include <linux/elevator.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 

drivers/scsi/lpfc/lpfc.h

@@ -22,6 +22,7 @@
  *******************************************************************/
 
 #include <scsi/scsi_host.h>
+#include <linux/hashtable.h>
 #include <linux/ktime.h>
 #include <linux/workqueue.h>
 

include/linux/blkdev.h

@@ -251,8 +251,6 @@ static inline unsigned short req_get_ioprio(struct request *req)
 	return req->ioprio;
 }
 
-#include <linux/elevator.h>
-
 struct bio_vec;
 
 enum blk_eh_timer_return {
@@ -1124,6 +1122,15 @@ extern void blk_queue_dma_alignment(struct request_queue *, int);
 extern void blk_queue_update_dma_alignment(struct request_queue *, int);
 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
+
+/*
+ * Elevator features for blk_queue_required_elevator_features:
+ */
+/* Supports zoned block devices sequential write constraint */
+#define ELEVATOR_F_ZBD_SEQ_WRITE	(1U << 0)
+/* Supports scheduling on multiple hardware queues */
+#define ELEVATOR_F_MQ_AWARE		(1U << 1)
+
 extern void blk_queue_required_elevator_features(struct request_queue *q,
 						 unsigned int features);
 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,

init/main.c

@@ -83,7 +83,6 @@
 #include <linux/ptrace.h>
 #include <linux/pti.h>
 #include <linux/blkdev.h>
-#include <linux/elevator.h>
 #include <linux/sched/clock.h>
 #include <linux/sched/task.h>
 #include <linux/sched/task_stack.h>