linux-kernel - [PATCH AUTOSEL 4.9 13/62] f2fs: do not set free of current section

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Message-ID: <20180902131411.183978-3-alexander.levin@microsoft.com>
Date:   Sun, 2 Sep 2018 13:14:17 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Yunlong Song <yunlong.song@...wei.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 13/62] f2fs: do not set free of current section

From: Yunlong Song <yunlong.song@...wei.com>

[ Upstream commit 3611ce9911267cb93d364bd71ddea6821278d11f ]

For the case when sbi->segs_per_sec > 1, take section:segment = 5 for
example, if segment 1 is just used and allocate new segment 2, and the
blocks of segment 1 is invalidated, at this time, the previous code will
use __set_test_and_free to free the free_secmap and free_sections++,
this is not correct since it is still a current section, so fix it.

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 fs/f2fs/segment.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index b164f8339281..3d9b9e98c4c2 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -386,6 +386,8 @@ static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
 	if (test_and_clear_bit(segno, free_i->free_segmap)) {
 		free_i->free_segments++;
 
+		if (IS_CURSEC(sbi, secno))
+			goto skip_free;
 		next = find_next_bit(free_i->free_segmap,
 				start_segno + sbi->segs_per_sec, start_segno);
 		if (next >= start_segno + sbi->segs_per_sec) {
@@ -393,6 +395,7 @@ static inline void __set_test_and_free(struct f2fs_sb_info *sbi,
 				free_i->free_sections++;
 		}
 	}
+skip_free:
 	spin_unlock(&free_i->segmap_lock);
 }
 
-- 
2.17.1