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linux/drivers/md/dm-snap.c
Mikulas Patocka ae1093be5a dm snapshot: use mutex instead of rw_semaphore 
The rw_semaphore is acquired for read only in two places, neither is
performance-critical.  So replace it with a mutex -- which is more
efficient.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
2018-01-17 09:16:14 -05:00

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