Commit c9a5e6a9 authored Aug 08, 2018 by Mike Snitzer

dm snapshot: remove stale FIXME in snapshot_map()



Commit ae1093be ("dm snapshot: use mutex instead of rw_semaphore")
eliminated the need to worry about read vs write locking.  So remove a
FIXME in snapshot_map() that is concerned about selectively taking a
write lock.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

parent 3db2776d

drivers/md/dm-snap.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -1707,8 +1707,6 @@ static int snapshot_map(struct dm_target ti, struct bio bio)
		if (!s->valid)
		return DM_MAPIO_KILL;

		/* FIXME: should only take write lock if we need
		* to copy an exception */
		mutex_lock(&s->lock);

		if (!s->valid \|\| (unlikely(s->snapshot_overflowed) &&