752fc07d33
Transitions 0->1 and 1->0 (which decide e.g. on putting the vnode on the free list) of either counter are still guarded with vnode interlock. Reviewed by: kib (earlier version) Tested by: pho
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
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*/
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/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/*
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* University Copyright- Copyright (c) 1982, 1986, 1988
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* The Regents of the University of California
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* All Rights Reserved
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*
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* University Acknowledgment- Portions of this document are derived from
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* software developed by the University of California, Berkeley, and its
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* contributors.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/taskq.h>
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#include <sys/vnode.h>
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/* Extensible attribute (xva) routines. */
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/*
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* Zero out the structure, set the size of the requested/returned bitmaps,
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* set AT_XVATTR in the embedded vattr_t's va_mask, and set up the pointer
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* to the returned attributes array.
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*/
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void
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xva_init(xvattr_t *xvap)
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{
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bzero(xvap, sizeof (xvattr_t));
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xvap->xva_mapsize = XVA_MAPSIZE;
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xvap->xva_magic = XVA_MAGIC;
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xvap->xva_vattr.va_mask = AT_XVATTR;
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xvap->xva_rtnattrmapp = &(xvap->xva_rtnattrmap)[0];
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}
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/*
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* If AT_XVATTR is set, returns a pointer to the embedded xoptattr_t
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* structure. Otherwise, returns NULL.
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*/
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xoptattr_t *
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xva_getxoptattr(xvattr_t *xvap)
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{
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xoptattr_t *xoap = NULL;
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if (xvap->xva_vattr.va_mask & AT_XVATTR)
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xoap = &xvap->xva_xoptattrs;
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return (xoap);
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}
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static void
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vn_rele_inactive(vnode_t *vp)
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{
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vrele(vp);
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}
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/*
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* Like vn_rele() except if we are going to call VOP_INACTIVE() then do it
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* asynchronously using a taskq. This can avoid deadlocks caused by re-entering
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* the file system as a result of releasing the vnode. Note, file systems
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* already have to handle the race where the vnode is incremented before the
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* inactive routine is called and does its locking.
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*
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* Warning: Excessive use of this routine can lead to performance problems.
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* This is because taskqs throttle back allocation if too many are created.
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*/
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void
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vn_rele_async(vnode_t *vp, taskq_t *taskq)
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{
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VERIFY(vp->v_count > 0);
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VI_LOCK(vp);
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if (vp->v_count == 1 && !(vp->v_iflag & VI_DOINGINACT)) {
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VI_UNLOCK(vp);
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VERIFY(taskq_dispatch((taskq_t *)taskq,
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(task_func_t *)vn_rele_inactive, vp, TQ_SLEEP) != 0);
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return;
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}
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refcount_release(&vp->v_usecount);
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vdropl(vp);
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}
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