linux-kernel - [PATCH] fs: f2fs: Use ktime_get_real_seconds for sit

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Message-Id: <1475364684-6557-1-git-send-email-deepa.kernel@gmail.com>
Date:   Sat,  1 Oct 2016 16:31:24 -0700
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, y2038@...ts.linaro.org,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Changman Lee <cm224.lee@...sung.com>,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: [PATCH] fs: f2fs: Use ktime_get_real_seconds for sit_info times

CURRENT_TIME_SEC is not y2038 safe.

Replace use of CURRENT_TIME_SEC with ktime_get_real_seconds
in segment timestamps used by GC algorithm including the
segment mtime timestamps.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
Reviewed-by: Arnd Bergmann <arnd@...db.de>
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Cc: Changman Lee <cm224.lee@...sung.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net
---
 fs/f2fs/segment.c | 2 +-
 fs/f2fs/segment.h | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index a46296f..34bb30e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2168,7 +2168,7 @@ static int build_sit_info(struct f2fs_sb_info *sbi)
 	sit_i->dirty_sentries = 0;
 	sit_i->sents_per_block = SIT_ENTRY_PER_BLOCK;
 	sit_i->elapsed_time = le64_to_cpu(sbi->ckpt->elapsed_time);
-	sit_i->mounted_time = CURRENT_TIME_SEC.tv_sec;
+	sit_i->mounted_time = ktime_get_real_seconds();
 	mutex_init(&sit_i->sentry_lock);
 	return 0;
 }
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index b33f73e..2423749 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -662,8 +662,9 @@ static inline void set_to_next_sit(struct sit_info *sit_i, unsigned int start)
 static inline unsigned long long get_mtime(struct f2fs_sb_info *sbi)
 {
 	struct sit_info *sit_i = SIT_I(sbi);
-	return sit_i->elapsed_time + CURRENT_TIME_SEC.tv_sec -
-						sit_i->mounted_time;
+	time64_t now = ktime_get_real_seconds();
+
+	return sit_i->elapsed_time + now - sit_i->mounted_time;
 }
 
 static inline void set_summary(struct f2fs_summary *sum, nid_t nid,
-- 
2.7.4