Thread (7 messages) 7 messages, 4 authors, 2020-11-16

Re: [PATCH 1/3] md: improve variable names in md_flush_request()

From: Paul Menzel <hidden>
Date: 2020-11-11 06:52:08
Also in: lkml

Dear Pankaj,


Thank you for the cleanups.

Am 11.11.20 um 06:16 schrieb Pankaj Gupta:
From: Pankaj Gupta <redacted>

  This patch improves readability by using better variable names
  in flush request coalescing logic.
Please do not indent the commit message.
quoted hunk ↗ jump to hunk
Signed-off-by: Pankaj Gupta <redacted>
---
  drivers/md/md.c | 8 ++++----
  drivers/md/md.h | 6 +++---
  2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 98bac4f304ae..167c80f98533 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -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;
diff --git a/drivers/md/md.h b/drivers/md/md.h
index ccfb69868c2e..2292c847f9dd 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -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.
+						*/
With the new variable name, the comment could even be removed. ;-)
  	struct work_struct flush_work;
  	struct work_struct event_work;	/* used by dm to report failure event */
  	mempool_t *serial_info_pool;
Reviewed-by: Paul Menzel <redacted>


Kind regards,

Paul
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