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block: move blk_io_schedule() out of header file 

blk_io_schedule() isn't called from performance sensitive code path, and
it is easier to maintain by exporting it as symbol.

Also blk_io_schedule() is only called by CONFIG_BLOCK code, so it is safe
to do this way. Meantime fixes build failure when CONFIG_BLOCK is off.

Cc: Christoph Hellwig <hch@infradead.org>
Fixes: e6249cdd46 ("block: add blk_io_schedule() for avoiding task hung in sync dio")
Reported-by: Satya Tangirala <satyat@google.com>
Tested-by: Satya Tangirala <satyat@google.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2020-05-14 16:45:09 +08:00 committed by Jens Axboe
parent 02ef12a663
commit 71ac860af8
2 changed files with 15 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
block/blk-core.c
View File

@ -38,6 +38,7 @@
#include <linux/debugfs.h>
#include <linux/bpf.h>
#include <linux/psi.h>
#include <linux/sched/sysctl.h>
#define CREATE_TRACE_POINTS
#include <trace/events/block.h>
@ -1812,6 +1813,18 @@ void blk_finish_plug(struct blk_plug *plug)
}
EXPORT_SYMBOL(blk_finish_plug);
void blk_io_schedule(void)
{
/* Prevent hang_check timer from firing at us during very long I/O */
unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
if (timeout)
io_schedule_timeout(timeout);
else
io_schedule();
}
EXPORT_SYMBOL_GPL(blk_io_schedule);
int __init blk_dev_init(void)
{
BUILD_BUG_ON(REQ_OP_LAST >= (1 << REQ_OP_BITS));

14
include/linux/blkdev.h
View File

@ -27,7 +27,6 @@
#include <linux/percpu-refcount.h>
#include <linux/scatterlist.h>
#include <linux/blkzoned.h>
#include <linux/sched/sysctl.h>
struct module;
struct scsi_ioctl_command;
@ -1221,6 +1220,8 @@ static inline bool blk_needs_flush_plug(struct task_struct *tsk)
!list_empty(&plug->cb_list));
}
extern void blk_io_schedule(void);
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_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);
@ -1851,15 +1852,4 @@ static inline void blk_wake_io_task(struct task_struct *waiter)
wake_up_process(waiter);
}
static inline void blk_io_schedule(void)
{
/* Prevent hang_check timer from firing at us during very long I/O */
unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2;
if (timeout)
io_schedule_timeout(timeout);
else
io_schedule();
}
#endif