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    Subject[PATCH 5.11 129/329] f2fs: fix to cover __allocate_new_section() with curseg_lock
    Date
    From: Chao Yu <yuchao0@huawei.com>

    [ Upstream commit 823d13e12b6cbaef2f6e5d63c648643e7bc094dd ]

    In order to avoid race with f2fs_do_replace_block().

    Fixes: f5a53edcf01e ("f2fs: support aligned pinned file")
    Signed-off-by: Chao Yu <yuchao0@huawei.com>
    Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    fs/f2fs/segment.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
    index ab0a2d2de9a9..73db79d958bd 100644
    --- a/fs/f2fs/segment.c
    +++ b/fs/f2fs/segment.c
    @@ -2955,19 +2955,23 @@ static void __allocate_new_section(struct f2fs_sb_info *sbi, int type)

    void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type)
    {
    + down_read(&SM_I(sbi)->curseg_lock);
    down_write(&SIT_I(sbi)->sentry_lock);
    __allocate_new_section(sbi, type);
    up_write(&SIT_I(sbi)->sentry_lock);
    + up_read(&SM_I(sbi)->curseg_lock);
    }

    void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
    {
    int i;

    + down_read(&SM_I(sbi)->curseg_lock);
    down_write(&SIT_I(sbi)->sentry_lock);
    for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++)
    __allocate_new_segment(sbi, i, false);
    up_write(&SIT_I(sbi)->sentry_lock);
    + up_read(&SM_I(sbi)->curseg_lock);
    }

    static const struct segment_allocation default_salloc_ops = {
    --
    2.30.2


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