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md: improve variable names in md_flush_request()

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This patch improves readability by using better variable names
in flush request coalescing logic.

Signed-off-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Pankaj Gupta 2020-11-11 06:16:56 +01:00 committed by Song Liu
parent 93decc5636
commit 81ba3c2462
2 changed files with 7 additions and 7 deletions
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8
drivers/md/md.c
View file

@ -639,7 +639,7 @@ static void md_submit_flush_data(struct work_struct *ws)
* could wait for this and below md_handle_request could wait for those
* bios because of suspend check
*/
mddev->last_flush = mddev->start_flush;
mddev->prev_flush_start = mddev->start_flush;
mddev->flush_bio = NULL;
wake_up(&mddev->sb_wait);
@ -660,13 +660,13 @@ static void md_submit_flush_data(struct work_struct *ws)
*/
bool md_flush_request(struct mddev *mddev, struct bio *bio)
{
ktime_t start = ktime_get_boottime();
ktime_t req_start = ktime_get_boottime();
spin_lock_irq(&mddev->lock);
wait_event_lock_irq(mddev->sb_wait,
!mddev->flush_bio ||
ktime_after(mddev->last_flush, start),
ktime_after(mddev->prev_flush_start, req_start),
mddev->lock);
if (!ktime_after(mddev->last_flush, start)) {
if (!ktime_after(mddev->prev_flush_start, req_start)) {
WARN_ON(mddev->flush_bio);
mddev->flush_bio = bio;
bio = NULL;

6
drivers/md/md.h
View file

@ -495,9 +495,9 @@ struct mddev {
*/
struct bio *flush_bio;
atomic_t flush_pending;
ktime_t start_flush, last_flush; /* last_flush is when the last completed
* flush was started.
*/
ktime_t start_flush, prev_flush_start; /* prev_flush_start is when the previous completed
* flush was started.
*/
struct work_struct flush_work;
struct work_struct event_work; /* used by dm to report failure event */
mempool_t *serial_info_pool;