linux-kernel - [PATCH v1 08/15] md/raid5-cache: Pass the log through to r5c_finish_cache

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Date:   Thu, 19 May 2022 13:13:04 -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>,
        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>
Subject: [PATCH v1 08/15] md/raid5-cache: Pass the log through to r5c_finish_cache_stripe()

r5c_finish_cache_stripe() dereferences conf->log, which will need an
rcu_read_lock(). But that is not necessary here as the log is already
available in the call sites through other means.

No functional changes intended.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/md/raid5-cache.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index cddc2c37d2c5..f7d013479a68 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -505,10 +505,9 @@ static void r5c_handle_parity_cached(struct stripe_head *sh)
  * Setting proper flags after writing (or flushing) data and/or parity to the
  * log device. This is called from r5l_log_endio() or r5l_log_flush_endio().
  */
-static void r5c_finish_cache_stripe(struct stripe_head *sh)
+static void r5c_finish_cache_stripe(struct r5l_log *log,
+				    struct stripe_head *sh)
 {
-	struct r5l_log *log = sh->raid_conf->log;
-
 	if (log->r5c_journal_mode == R5C_JOURNAL_MODE_WRITE_THROUGH) {
 		BUG_ON(test_bit(STRIPE_R5C_CACHING, &sh->state));
 		/*
@@ -526,14 +525,14 @@ static void r5c_finish_cache_stripe(struct stripe_head *sh)
 	}
 }
 
-static void r5l_io_run_stripes(struct r5l_io_unit *io)
+static void r5l_io_run_stripes(struct r5l_log *log, struct r5l_io_unit *io)
 {
 	struct stripe_head *sh, *next;
 
 	list_for_each_entry_safe(sh, next, &io->stripe_list, log_list) {
 		list_del_init(&sh->log_list);
 
-		r5c_finish_cache_stripe(sh);
+		r5c_finish_cache_stripe(log, sh);
 
 		set_bit(STRIPE_HANDLE, &sh->state);
 		raid5_release_stripe(sh);
@@ -552,7 +551,7 @@ static void r5l_log_run_stripes(struct r5l_log *log)
 			break;
 
 		list_move_tail(&io->log_sibling, &log->finished_ios);
-		r5l_io_run_stripes(io);
+		r5l_io_run_stripes(log, io);
 	}
 }
 
@@ -1282,7 +1281,7 @@ static void r5l_log_flush_endio(struct bio *bio)
 
 	spin_lock_irqsave(&log->io_list_lock, flags);
 	list_for_each_entry(io, &log->flushing_ios, log_sibling)
-		r5l_io_run_stripes(io);
+		r5l_io_run_stripes(log, io);
 	list_splice_tail_init(&log->flushing_ios, &log->finished_ios);
 	spin_unlock_irqrestore(&log->io_list_lock, flags);
 
-- 
2.30.2