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For vunref(), try to upgrade the vnode lock if the function was called

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with the vnode shared-locked.  If upgrade succeeded, the inactivation
can be done immediately, instead of being postponed.

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Approved by:	re (glebius)
This commit is contained in:
Konstantin Belousov 2013-09-29 18:07:14 +00:00
parent ac34145005
commit fe39412e99
1 changed files with 4 additions and 2 deletions
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6
sys/kern/vfs_subr.c
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@ -2218,8 +2218,10 @@ 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)