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dm snapshot: remove stale FIXME in snapshot_map()

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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>
This commit is contained in:
Mike Snitzer 2018-08-08 20:50:58 -04:00
parent 3db2776d9f
commit c9a5e6a968
1 changed files with 0 additions and 2 deletions
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drivers/md/dm-snap.c
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@ -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) &&