From e4a81003b038ab31ba745f8b93398f2016f55623 Mon Sep 17 00:00:00 2001 From: Jason Baron Date: Fri, 16 Mar 2012 16:34:03 -0400 Subject: [PATCH] Don't limit non-nested epoll paths commit 93dc6107a76daed81c07f50215fa6ae77691634f upstream. Commit 28d82dc1c4ed ("epoll: limit paths") that I did to limit the number of possible wakeup paths in epoll is causing a few applications to longer work (dovecot for one). The original patch is really about limiting the amount of epoll nesting (since epoll fds can be attached to other fds). Thus, we probably can allow an unlimited number of paths of depth 1. My current patch limits it at 1000. And enforce the limits on paths that have a greater depth. This is captured in: https://bugzilla.redhat.com/show_bug.cgi?id=681578 Signed-off-by: Jason Baron Cc: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Jonathan Nieder Signed-off-by: Ben Hutchings --- fs/eventpoll.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/eventpoll.c b/fs/eventpoll.c index ea54cdef04dd..4d9d3a45e356 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -988,6 +988,10 @@ static int path_count[PATH_ARR_SIZE]; static int path_count_inc(int nests) { + /* Allow an arbitrary number of depth 1 paths */ + if (nests == 0) + return 0; + if (++path_count[nests] > path_limits[nests]) return -1; return 0; -- 2.39.2