Date: Wed, 15 Jul 2009 12:16:27 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: freebsd-current@freebsd.org Subject: help w.r.t. vfs_event_signal(..VQ_NOTRESPLOCK) in nlm Message-ID: <Pine.GSO.4.63.0907151210120.13681@muncher.cs.uoguelph.ca>
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Hi, I'm trying to fix a problem in nlm_advlock.c that causes crashes during forced dismounts. The reason for the crash is obvious, but a correct fix not so much so. The crashes occur because nlm_down() and nlm_up() assume that the mount point structure still exists, when it might not. The part that I don't understand is that they do the following: vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid, VQ_NOTRESPLOCK, 0); once for each cycle of down/up, using a per-mountpoint flag. It's the per-mountpoint flag that you don't actually have access to. So, does anyone happen to know what the above does and whether it has to happen once/mountpoint OR would once for all mountpoints be sufficient? (Although fsid is the first argument, it appears that it isn't actually used.) Thanks in adavnce for any help, rick
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