• Benjamin Marzinski's avatar
    GFS2: Test bufdata with buffer locked and gfs2_log_lock held · 96e5d1d3
    Benjamin Marzinski authored
    In gfs2_trans_add_bh(), gfs2 was testing if a there was a bd attached to the
    buffer without having the gfs2_log_lock held. It was then assuming it would
    stay attached for the rest of the function. However, without either the log
    lock being held of the buffer locked, __gfs2_ail_flush() could detach bd at any
    time.  This patch moves the locking before the test.  If there isn't a bd
    already attached, gfs2 can safely allocate one and attach it before locking.
    There is no way that the newly allocated bd could be on the ail list,
    and thus no way for __gfs2_ail_flush() to detach it.
    Signed-off-by: default avatarBenjamin Marzinski <bmarzins@redhat.com>
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    96e5d1d3
trans.c 5 KB