• Kent Overstreet's avatar
    bcache: Fix flushes in writeback mode · c0f04d88
    Kent Overstreet authored
    In writeback mode, when we get a cache flush we need to make sure we
    issue a flush to the backing device.
    
    The code for sending down an extra flush was wrong - by cloning the bio
    we were probably getting flags that didn't make sense for a bare flush,
    and also the old code was firing for FUA bios, for which we don't need
    to send a flush to the backing device.
    
    This was causing data corruption somehow - the mechanism was never
    determined, but this patch fixes it for the users that were seeing it.
    Signed-off-by: default avatarKent Overstreet <kmo@daterainc.com>
    Cc: linux-stable <stable@vger.kernel.org> # >= v3.10
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    c0f04d88
request.c 33 KB