git: dm - get rid of excessive locking and redundancy
commit ba65987cf1e7af06cfd4295d0bd5e67e3469e4a2
Author: Alex Hornung <ahornung@gmail.com>
Date: Thu Jul 14 19:43:15 2011 +0100
dm - get rid of excessive locking and redundancy
* Just use dev->si_drv1 for the strategy, disk ioctl and dump as the
underlying device and 'dmv' is guaranteed not to go away. Keep the
locked approach (dm_dev_lookup) for open, close, and mapper ioctls to
ensure that we never rip out any node that's still in use.
* This eliminates exclusive locking in the IO path, which should
improve performance.
Summary of changes:
sys/dev/disk/dm/device-mapper.c | 25 +++++--------------------
sys/dev/disk/dm/dm_dev.c | 3 +++
sys/dev/disk/dm/dm_ioctl.c | 6 ++++--
3 files changed, 12 insertions(+), 22 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/ba65987cf1e7af06cfd4295d0bd5e67e3469e4a2
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