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PR/42318 CVS commit: src/sys/kern
The following reply was made to PR kern/42318; it has been noted by GNATS.
From: Manuel Bouyer <bouyer%netbsd.org@localhost>
Subject: PR/42318 CVS commit: src/sys/kern
Date: Sat, 28 Nov 2009 10:10:18 +0000
Module Name: src
Committed By: bouyer
Date: Sat Nov 28 10:10:18 UTC 2009
Previous did cause a deadlock with layered FS: the vrele thread
can sleep on the vnode lock, while vget is sleeping on the
VI_INACTNOW flag (or the vget caller is looping on vget returning failure
because of the VI_INACTNOW flag). With layered FSes, the upper and lower
vnodes share the same lock, so the vget() caller above can be already
holding the vnode lock.
Fix by dropping VI_INACTNOW before sleeping on the vnode lock in
vrelel(), and check the ref count again once we have the lock. If the
vnode has more than one reference, donc VOP_INACTIVE it.
Fix PR kern/42318 and PR kern/42377
patch tested by Hisashi T Fujinaka, Joachim König, Stephen Borrill and
To generate a diff of this commit:
cvs rdiff -u -r1.391 -r1.392 src/sys/kern/vfs_subr.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
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