[PATCH 20/28] bio.h: move declarations to bio_types.h

[Max Kellermann]

By providing declarations in a lean header, we can reduce header
dependencies.

Signed-off-by: Max Kellermann <max.kellermann@xxxxxxxxx>
---
 include/linux/bio.h       | 74 +---------------------------------
 include/linux/bio_types.h | 84 +++++++++++++++++++++++++++++++++++++++
 include/linux/blkdev.h    |  2 +-
 3 files changed, 86 insertions(+), 74 deletions(-)
 create mode 100644 include/linux/bio_types.h

diff --git a/include/linux/bio.h b/include/linux/bio.h
index b8562d4b57b2..cada670f63d8 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -5,6 +5,7 @@
 #ifndef __LINUX_BIO_H
 #define __LINUX_BIO_H
 
+#include <linux/bio_types.h>
 #include <linux/mempool.h>
 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
 #include <linux/blk_types.h>
@@ -20,35 +21,6 @@ static inline unsigned int bio_max_segs(unsigned int nr_segs)
 	return min(nr_segs, BIO_MAX_VECS);
 }
 
-#define bio_prio(bio)			(bio)->bi_ioprio
-#define bio_set_prio(bio, prio)		((bio)->bi_ioprio = prio)
-
-#define bio_iter_iovec(bio, iter)				\
-	bvec_iter_bvec((bio)->bi_io_vec, (iter))
-
-#define bio_iter_page(bio, iter)				\
-	bvec_iter_page((bio)->bi_io_vec, (iter))
-#define bio_iter_len(bio, iter)					\
-	bvec_iter_len((bio)->bi_io_vec, (iter))
-#define bio_iter_offset(bio, iter)				\
-	bvec_iter_offset((bio)->bi_io_vec, (iter))
-
-#define bio_page(bio)		bio_iter_page((bio), (bio)->bi_iter)
-#define bio_offset(bio)		bio_iter_offset((bio), (bio)->bi_iter)
-#define bio_iovec(bio)		bio_iter_iovec((bio), (bio)->bi_iter)
-
-#define bvec_iter_sectors(iter)	((iter).bi_size >> 9)
-#define bvec_iter_end_sector(iter) ((iter).bi_sector + bvec_iter_sectors((iter)))
-
-#define bio_sectors(bio)	bvec_iter_sectors((bio)->bi_iter)
-#define bio_end_sector(bio)	bvec_iter_end_sector((bio)->bi_iter)
-
-/*
- * Return the data direction, READ or WRITE.
- */
-#define bio_data_dir(bio) \
-	(op_is_write(bio_op(bio)) ? WRITE : READ)
-
 static inline void *bio_data(struct bio *bio)
 {
 	if (bio_has_data(bio))
@@ -521,18 +493,6 @@ static inline void bio_set_dev(struct bio *bio, struct block_device *bdev)
 	bio_associate_blkg(bio);
 }
 
-/*
- * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
- *
- * A bio_list anchors a singly-linked list of bios chained through the bi_next
- * member of the bio.  The bio_list also caches the last list member to allow
- * fast access to the tail.
- */
-struct bio_list {
-	struct bio *head;
-	struct bio *tail;
-};
-
 static inline int bio_list_empty(const struct bio_list *bl)
 {
 	return bl->head == NULL;
@@ -656,38 +616,6 @@ static inline void bio_inc_remaining(struct bio *bio)
  */
 #define BIO_POOL_SIZE 2
 
-struct bio_set {
-	struct kmem_cache *bio_slab;
-	unsigned int front_pad;
-
-	/*
-	 * per-cpu bio alloc cache
-	 */
-	struct bio_alloc_cache __percpu *cache;
-
-	mempool_t bio_pool;
-	mempool_t bvec_pool;
-#if defined(CONFIG_BLK_DEV_INTEGRITY)
-	mempool_t bio_integrity_pool;
-	mempool_t bvec_integrity_pool;
-#endif
-
-	unsigned int back_pad;
-	/*
-	 * Deadlock avoidance for stacking block drivers: see comments in
-	 * bio_alloc_bioset() for details
-	 */
-	spinlock_t		rescue_lock;
-	struct bio_list		rescue_list;
-	struct work_struct	rescue_work;
-	struct workqueue_struct	*rescue_workqueue;
-
-	/*
-	 * Hot un-plug notifier for the per-cpu cache, if used
-	 */
-	struct hlist_node cpuhp_dead;
-};
-
 static inline bool bioset_initialized(struct bio_set *bs)
 {
 	return bs->bio_slab != NULL;
diff --git a/include/linux/bio_types.h b/include/linux/bio_types.h
new file mode 100644
index 000000000000..bf0d8def2777
--- /dev/null
+++ b/include/linux/bio_types.h
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2001 Jens Axboe <axboe@xxxxxxx>
+ */
+#ifndef __LINUX_BIO_TYPES_H
+#define __LINUX_BIO_TYPES_H
+
+#include <linux/mempool.h>
+#include <linux/workqueue_types.h>
+
+#define bio_prio(bio)			(bio)->bi_ioprio
+#define bio_set_prio(bio, prio)		((bio)->bi_ioprio = prio)
+
+#define bio_iter_iovec(bio, iter)				\
+	bvec_iter_bvec((bio)->bi_io_vec, (iter))
+
+#define bio_iter_page(bio, iter)				\
+	bvec_iter_page((bio)->bi_io_vec, (iter))
+#define bio_iter_len(bio, iter)					\
+	bvec_iter_len((bio)->bi_io_vec, (iter))
+#define bio_iter_offset(bio, iter)				\
+	bvec_iter_offset((bio)->bi_io_vec, (iter))
+
+#define bio_page(bio)		bio_iter_page((bio), (bio)->bi_iter)
+#define bio_offset(bio)		bio_iter_offset((bio), (bio)->bi_iter)
+#define bio_iovec(bio)		bio_iter_iovec((bio), (bio)->bi_iter)
+
+#define bvec_iter_sectors(iter)	((iter).bi_size >> 9)
+#define bvec_iter_end_sector(iter) ((iter).bi_sector + bvec_iter_sectors((iter)))
+
+#define bio_sectors(bio)	bvec_iter_sectors((bio)->bi_iter)
+#define bio_end_sector(bio)	bvec_iter_end_sector((bio)->bi_iter)
+
+/*
+ * Return the data direction, READ or WRITE.
+ */
+#define bio_data_dir(bio) \
+	(op_is_write(bio_op(bio)) ? WRITE : READ)
+
+/*
+ * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
+ *
+ * A bio_list anchors a singly-linked list of bios chained through the bi_next
+ * member of the bio.  The bio_list also caches the last list member to allow
+ * fast access to the tail.
+ */
+struct bio_list {
+	struct bio *head;
+	struct bio *tail;
+};
+
+struct bio_set {
+	struct kmem_cache *bio_slab;
+	unsigned int front_pad;
+
+	/*
+	 * per-cpu bio alloc cache
+	 */
+	struct bio_alloc_cache __percpu *cache;
+
+	mempool_t bio_pool;
+	mempool_t bvec_pool;
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+	mempool_t bio_integrity_pool;
+	mempool_t bvec_integrity_pool;
+#endif
+
+	unsigned int back_pad;
+	/*
+	 * Deadlock avoidance for stacking block drivers: see comments in
+	 * bio_alloc_bioset() for details
+	 */
+	spinlock_t		rescue_lock;
+	struct bio_list		rescue_list;
+	struct work_struct	rescue_work;
+	struct workqueue_struct	*rescue_workqueue;
+
+	/*
+	 * Hot un-plug notifier for the per-cpu cache, if used
+	 */
+	struct hlist_node cpuhp_dead;
+};
+
+#endif /* __LINUX_BIO_TYPES_H */
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a5e41a54de18..09e8f023070c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -14,7 +14,7 @@
 #include <linux/timer_types.h>
 #include <linux/workqueue_types.h>
 #include <linux/wait_types.h>
-#include <linux/bio.h>
+#include <linux/bio_types.h>
 #include <linux/gfp_types.h>
 #include <linux/kdev_t.h>
 #include <linux/rcupdate.h>
-- 
2.39.2