• C
    Btrfs: fix deadlocks with trylock on tree nodes · ea4ebde0
    Chris Mason 提交于
    The Btrfs tree trylock function is poorly named.  It always takes
    the spinlock and backs off if the blocking lock is held.  This
    can lead to surprising lockups because people expect it to really be a
    trylock.
    
    This commit makes it a pure trylock, both for the spinlock and the
    blocking lock.  It also reworks the nested lock handling slightly to
    avoid taking the read lock while a spinning write lock might be held.
    Signed-off-by: NChris Mason <clm@fb.com>
    ea4ebde0
locking.c 7.6 KB