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block: cleanup the flush plug helpers 

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2018403

commit 008f75a20e7072d0840ec323c39b42206f3fa8a0
Author: Christoph Hellwig <hch@lst.de>
Date:   Wed Oct 20 16:41:19 2021 +0200

    block: cleanup the flush plug helpers

    Consolidate the various helpers into a single blk_flush_plug helper that
    takes a plk_plug and the from_scheduler bool and switch all callsites to
    call it directly.  Checks that the plug is non-NULL must be performed by
    the caller, something that most already do anyway.

    Signed-off-by: Christoph Hellwig <hch@lst.de>
    Link: https://lore.kernel.org/r/20211020144119.142582-5-hch@lst.de
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Ming Lei <ming.lei@redhat.com>
This commit is contained in:
Ming Lei 2021-11-17 09:35:53 +08:00
parent 062937f2c2
commit fe4ec6f985
4 changed files with 16 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
block/blk-core.c
View File

@ -1089,7 +1089,7 @@ int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags)
return 0;
if (current->plug)
blk_flush_plug_list(current->plug, false);
blk_flush_plug(current->plug, false);
if (blk_queue_enter(q, BLK_MQ_REQ_NOWAIT))
return 0;
@ -1637,7 +1637,7 @@ struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, void *data,
}
EXPORT_SYMBOL(blk_check_plugged);
void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
void blk_flush_plug(struct blk_plug *plug, bool from_schedule)
{
if (!list_empty(&plug->cb_list))
flush_plug_callbacks(plug, from_schedule);
@ -1659,11 +1659,10 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
*/
void blk_finish_plug(struct blk_plug *plug)
{
if (plug != current->plug)
return;
blk_flush_plug_list(plug, false);
current->plug = NULL;
if (plug == current->plug) {
blk_flush_plug(plug, false);
current->plug = NULL;
}
}
EXPORT_SYMBOL(blk_finish_plug);

5
fs/fs-writeback.c
View File

@ -1893,7 +1893,8 @@ static long writeback_sb_inodes(struct super_block *sb,
* unplug, so get our IOs out the door before we
* give up the CPU.
*/
blk_flush_plug(current);
if (current->plug)
blk_flush_plug(current->plug, false);
cond_resched();
}
@ -2291,7 +2292,7 @@ void wakeup_flusher_threads(enum wb_reason reason)
* If we are expecting writeback progress we must submit plugged IO.
*/
if (blk_needs_flush_plug(current))
blk_schedule_flush_plug(current);
blk_flush_plug(current->plug, true);
rcu_read_lock();
list_for_each_entry_rcu(bdi, &bdi_list, bdi_list)

29
include/linux/blkdev.h
View File

@ -749,9 +749,8 @@ extern void blk_set_queue_dying(struct request_queue *);
* as the lock contention for request_queue lock is reduced.
*
* It is ok not to disable preemption when adding the request to the plug list
* or when attempting a merge, because blk_schedule_flush_list() will only flush
* the plug list when the task sleeps by itself. For details, please see
* schedule() where blk_schedule_flush_plug() is called.
* or when attempting a merge. For details, please see schedule() where
* blk_flush_plug() is called.
*/
struct blk_plug {
struct request *mq_list; /* blk-mq requests */
@ -781,23 +780,8 @@ extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
extern void blk_start_plug(struct blk_plug *);
extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);
extern void blk_finish_plug(struct blk_plug *);
extern void blk_flush_plug_list(struct blk_plug *, bool);
static inline void blk_flush_plug(struct task_struct *tsk)
{
struct blk_plug *plug = tsk->plug;
if (plug)
blk_flush_plug_list(plug, false);
}
static inline void blk_schedule_flush_plug(struct task_struct *tsk)
{
struct blk_plug *plug = tsk->plug;
if (plug)
blk_flush_plug_list(plug, true);
}
void blk_flush_plug(struct blk_plug *plug, bool from_schedule);
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
@ -826,15 +810,10 @@ static inline void blk_finish_plug(struct blk_plug *plug)
{
}
static inline void blk_flush_plug(struct task_struct *task)
static inline void blk_flush_plug(struct blk_plug *plug, bool async)
{
}
static inline void blk_schedule_flush_plug(struct task_struct *task)
{
}
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
return false;

5
kernel/sched/core.c
View File

@ -6343,7 +6343,7 @@ static inline void sched_submit_work(struct task_struct *tsk)
* make sure to submit it to avoid deadlocks.
*/
if (blk_needs_flush_plug(tsk))
blk_schedule_flush_plug(tsk);
blk_flush_plug(tsk->plug, true);
}
static void sched_update_worker(struct task_struct *tsk)
@ -8343,7 +8343,8 @@ int io_schedule_prepare(void)
int old_iowait = current->in_iowait;
current->in_iowait = 1;
blk_schedule_flush_plug(current);
if (current->plug)
blk_flush_plug(current->plug, true);
return old_iowait;
}