tjh.dev / kernel
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Don't limit non-nested epoll paths

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 <jbaron@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Jason Baron and committed by
Linus Torvalds 93dc6107 c579bc7e

+4
+4
fs/eventpoll.c
··· 988 988 989 989 static int path_count_inc(int nests) 990 990 { 991 + /* Allow an arbitrary number of depth 1 paths */ 992 + if (nests == 0) 993 + return 0; 994 + 991 995 if (++path_count[nests] > path_limits[nests]) 992 996 return -1; 993 997 return 0;