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    Btrfs: just wait or commit our own log sub-transaction · d1433deb
    Miao Xie 提交于
    We might commit the log sub-transaction which didn't contain the metadata we
    logged. It was because we didn't record the log transid and just select
    the current log sub-transaction to commit, but the right one might be
    committed by the other task already. Actually, we needn't do anything
    and it is safe that we go back directly in this case.
    
    This patch improves the log sync by the above idea. We record the transid
    of the log sub-transaction in which we log the metadata, and the transid
    of the log sub-transaction we have committed. If the committed transid
    is >= the transid we record when logging the metadata, we just go back.
    Signed-off-by: NMiao Xie <miaox@cn.fujitsu.com>
    Signed-off-by: NJosef Bacik <jbacik@fb.com>
    d1433deb
disk-io.c 111.4 KB