locks: avoid taking global lock if possible when waking up blocked waiters

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Since we always hold the i_lock when inserting a new waiter onto the
fl_block list, we can avoid taking the global lock at all if we find
that it's empty when we go to wake up blocked waiters.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Jeff Layton 2013-06-21 08:58:16 -04:00 • committed by Al Viro

parent 1c8c601a8c

commit 4e8c765d38

1 changed files with 14 additions and 1 deletions

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fs/locks.c

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