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block: reduce ifdef CONFIG_BLOCK madness in headers

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Large part of bio.h, blkdev.h and genhd.h are under ifdef CONFIG_BLOCK
for no good reason.  Only stub out function that are called from
code that is not dependent on CONFIG_BLOCK and leave the harmless
other declarations around.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-06-20 09:16:43 +02:00
committed by Jens Axboe
parent d2de7ea48d
commit 1a4dcfa8bc
3 changed files with 46 additions and 63 deletions
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92
include/linux/blkdev.h
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@@ -4,9 +4,6 @@
#include <linux/sched.h>
#include <linux/sched/clock.h>
#ifdef CONFIG_BLOCK
#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/list.h>
@@ -1163,13 +1160,13 @@ static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq,
return __blk_rq_map_sg(q, rq, sglist, &last_sg);
}
extern void blk_dump_rq_flags(struct request *, char *);
extern long nr_blockdev_pages(void);
bool __must_check blk_get_queue(struct request_queue *);
struct request_queue *blk_alloc_queue(make_request_fn make_request, int node_id);
extern void blk_put_queue(struct request_queue *);
extern void blk_set_queue_dying(struct request_queue *);
#ifdef CONFIG_BLOCK
/*
* blk_plug permits building a queue of related requests by holding the I/O
* fragments for a short period. This allows merging of sequential requests
@@ -1229,9 +1226,47 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
!list_empty(&plug->cb_list));
}
int blkdev_issue_flush(struct block_device *, gfp_t);
long nr_blockdev_pages(void);
#else /* CONFIG_BLOCK */
struct blk_plug {
};
static inline void blk_start_plug(struct blk_plug *plug)
{
}
static inline void blk_finish_plug(struct blk_plug *plug)
{
}
static inline void blk_flush_plug(struct task_struct *task)
{
}
static inline void blk_schedule_flush_plug(struct task_struct *task)
{
}
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
return false;
}
static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
{
return 0;
}
static inline long nr_blockdev_pages(void)
{
return 0;
}
#endif /* CONFIG_BLOCK */
extern void blk_io_schedule(void);
int blkdev_issue_flush(struct block_device *, gfp_t);
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask, struct page *page);
@@ -1831,51 +1866,6 @@ static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
}
#endif /* CONFIG_BLK_DEV_ZONED */
#else /* CONFIG_BLOCK */
struct block_device;
/*
* stubs for when the block layer is configured out
*/
static inline long nr_blockdev_pages(void)
{
return 0;
}
struct blk_plug {
};
static inline void blk_start_plug(struct blk_plug *plug)
{
}
static inline void blk_finish_plug(struct blk_plug *plug)
{
}
static inline void blk_flush_plug(struct task_struct *task)
{
}
static inline void blk_schedule_flush_plug(struct task_struct *task)
{
}
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
return false;
}
static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask)
{
return 0;
}
#endif /* CONFIG_BLOCK */
static inline void blk_wake_io_task(struct task_struct *waiter)
{
/*
@@ -1889,7 +1879,6 @@ static inline void blk_wake_io_task(struct task_struct *waiter)
wake_up_process(waiter);
}
#ifdef CONFIG_BLOCK
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op);
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
@@ -1915,7 +1904,6 @@ static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
{
return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time);
}
#endif /* CONFIG_BLOCK */
int bdev_read_only(struct block_device *bdev);
int set_blocksize(struct block_device *bdev, int size);