linux-kernel - [PATCH 3/7] f2fs: try to keep CP_TRIMMED

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Message-Id: <20190128234717.77225-3-jaegeuk@kernel.org>
Date:   Tue, 29 Jan 2019 07:47:13 +0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 3/7] f2fs: try to keep CP_TRIMMED_FLAG after successful umount

If every discard were issued successfully, we can avoid further discard.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/segment.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 342b720fb4db..fdd8cd21522f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1063,6 +1063,8 @@ static void __init_discard_policy(struct f2fs_sb_info *sbi,
 	} else if (discard_type == DPOLICY_UMOUNT) {
 		dpolicy->max_requests = UINT_MAX;
 		dpolicy->io_aware = false;
+		/* we need to issue all to keep CP_TRIMMED_FLAG */
+		dpolicy->granularity = 1;
 	}
 }
 
-- 
2.19.0.605.g01d371f741-goog