linux-kernel - [PATCH v2 10/17] md/raid5-cache: Take struct r5l_log in r5c_log_required_to_flush

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Date:   Thu, 26 May 2022 10:35:57 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
        Song Liu <song@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Donald Buczek <buczek@...gen.mpg.de>,
        Guoqing Jiang <guoqing.jiang@...ux.dev>,
        Xiao Ni <xni@...hat.com>, Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <Martin.Oliveira@...eticom.com>,
        David Sloan <David.Sloan@...eticom.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH v2 10/17] md/raid5-cache: Take struct r5l_log in r5c_log_required_to_flush_cache()

The only call site of r5c_log_required_to_flush_cache() already has
a log pointer and has already checked that it is writeback. So the
dereference and writeback check is redundant. Just pass the log pointer.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 drivers/md/raid5-cache.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 9a8f2a988b03..a3c4d43d6deb 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -412,13 +412,9 @@ void r5c_check_cached_full_stripe(struct r5conf *conf)
  *     (stripe_in_journal_count) * (max_degraded + 1) +
  *     (group_cnt + 1) * (raid_disks - max_degraded)
  */
-static sector_t r5c_log_required_to_flush_cache(struct r5conf *conf)
+static sector_t r5c_log_required_to_flush_cache(struct r5conf *conf,
+						struct r5l_log *log)
 {
-	struct r5l_log *log = conf->log;
-
-	if (!r5c_is_writeback(log))
-		return 0;
-
 	return BLOCK_SECTORS *
 		((conf->max_degraded + 1) * atomic_read(&log->stripe_in_journal_count) +
 		 (conf->raid_disks - conf->max_degraded) * (conf->group_cnt + 1));
@@ -443,7 +439,7 @@ static inline void r5c_update_log_state(struct r5l_log *log)
 
 	free_space = r5l_ring_distance(log, log->log_start,
 				       log->last_checkpoint);
-	reclaim_space = r5c_log_required_to_flush_cache(conf);
+	reclaim_space = r5c_log_required_to_flush_cache(conf, log);
 	if (free_space < 2 * reclaim_space)
 		set_bit(R5C_LOG_CRITICAL, &conf->cache_state);
 	else {
-- 
2.30.2