Author: kib
Date: Sun Oct 6 06:14:29 2013
New Revision: 256078
URL: http://svnweb.freebsd.org/changeset/base/256078
Log:
MFC r255942:
For vunref(), try to upgrade the vnode lock if the function was called
with the vnode shared-locked.
Modified:
stable/9/sys/kern/vfs_subr.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/kern/vfs_subr.c
==============================================================================
--- stable/9/sys/kern/vfs_subr.c Sun Oct 6 06:09:43 2013
(r256077)
+++ stable/9/sys/kern/vfs_subr.c Sun Oct 6 06:14:29 2013
(r256078)
@@ -2343,8 +2343,10 @@ vputx(struct vnode *vp, int func)
}
break;
case VPUTX_VUNREF:
- if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE)
- error = EBUSY;
+ if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
+ error = VOP_LOCK(vp, LK_TRYUPGRADE | LK_INTERLOCK);
+ VI_LOCK(vp);
+ }
break;
}
if (vp->v_usecount > 0)
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