Btrfs: use ACCESS_ONCE to prevent the optimize accesses to ->last_trans_log_full_commit
->last_trans_log_full_commit may be changed by the other tasks without lock, so we need prevent the compiler from the optimize access just like tmp = fs_info->last_trans_log_full_commit if (tmp == ...) ... <do something> if (tmp == ...) ... In fact, we need get the new value of ->last_trans_log_full_commit during the second access. Fix it by ACCESS_ONCE(). Signed-off-by:Miao Xie <miaox@cn.fujitsu.com> Signed-off-by:
Josef Bacik <jbacik@fb.com>
parent
7813b3db
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