mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-04 12:28:58 +00:00
Change the 0xdeadb hack to a flag called VDOOMED.
Introduce VFREE which indicates that vnode is on freelist. Rename vholdrele() to vdrop(). Create vfree() and vbusy() to add/delete vnode from freelist. Add vfree()/vbusy() to keep (v_holdcnt != 0 || v_usecount != 0) vnodes off the freelist. Generalize vhold()/v_holdcnt to mean "do not recycle". Fix reassignbuf()s lack of use of vhold(). Use vhold() instead of checking v_cache_src list. Remove vtouch(), the vnodes are always vget'ed soon enough after for it to have any measuable effect. Add sysctl debug.freevnodes to keep track of things. Move cache_purge() up in getnewvnodes to avoid race. Decrement v_usecount after VOP_INACTIVE(), put a vhold() on it during VOP_INACTIVE() Unmacroize vhold()/vdrop() Print out VDOOMED and VFREE flags (XXX: should use %b) Reviewed by: dyson
This commit is contained in:
Poul-Henning Kamp
parent
e6dcdf4dd1
commit
a051452ae2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=28954
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* @(#)vfs_cache.c 8.5 (Berkeley) 3/22/95
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* $Id: vfs_cache.c,v 1.26 1997/08/04 07:31:36 phk Exp $
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* $Id: vfs_cache.c,v 1.27 1997/08/26 07:32:34 phk Exp $
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*/
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#include <sys/param.h>
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@ -103,6 +103,8 @@ cache_zap(ncp)
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{
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LIST_REMOVE(ncp, nc_hash);
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LIST_REMOVE(ncp, nc_src);
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if (LIST_EMPTY(&ncp->nc_dvp->v_cache_src))
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vdrop(ncp->nc_dvp);
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if (ncp->nc_vp) {
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TAILQ_REMOVE(&ncp->nc_vp->v_cache_dst, ncp, nc_dst);
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} else {
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@ -180,7 +182,6 @@ cache_lookup(dvp, vpp, cnp)
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/* We found a "positive" match, return the vnode */
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if (ncp->nc_vp) {
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nchstats.ncs_goodhits++;
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vtouch(ncp->nc_vp);
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*vpp = ncp->nc_vp;
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return (-1);
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}
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@ -239,8 +240,10 @@ cache_enter(dvp, vp, cnp)
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malloc(sizeof *ncp + cnp->cn_namelen, M_CACHE, M_WAITOK);
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bzero((char *)ncp, sizeof *ncp);
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numcache++;
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if (!vp)
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if (!vp) {
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numneg++;
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ncp->nc_flag = cnp->cn_flags & ISWHITEOUT ? NCF_WHITE : 0;
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}
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/*
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* Fill in cache info, if vp is NULL this is a "negative" cache entry.
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@ -249,15 +252,13 @@ cache_enter(dvp, vp, cnp)
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* otherwise unused.
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*/
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ncp->nc_vp = vp;
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if (vp)
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vtouch(vp);
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else
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ncp->nc_flag = cnp->cn_flags & ISWHITEOUT ? NCF_WHITE : 0;
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ncp->nc_dvp = dvp;
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ncp->nc_nlen = cnp->cn_namelen;
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bcopy(cnp->cn_nameptr, ncp->nc_name, (unsigned)ncp->nc_nlen);
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ncpp = NCHHASH(dvp, cnp);
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LIST_INSERT_HEAD(ncpp, ncp, nc_hash);
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if (LIST_EMPTY(&dvp->v_cache_src))
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vhold(dvp);
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LIST_INSERT_HEAD(&dvp->v_cache_src, ncp, nc_src);
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if (vp) {
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TAILQ_INSERT_HEAD(&vp->v_cache_dst, ncp, nc_dst);
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@ -36,7 +36,7 @@
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* SUCH DAMAGE.
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*
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* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
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* $Id: vfs_subr.c,v 1.94 1997/08/26 04:36:17 dyson Exp $
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* $Id: vfs_subr.c,v 1.95 1997/08/26 11:59:20 bde Exp $
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*/
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/*
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@ -103,6 +103,7 @@ int vttoif_tab[9] = {
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}
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TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */
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static u_long freevnodes = 0;
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SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, "");
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struct mntlist mountlist; /* mounted filesystem list */
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struct simplelock mountlist_slock;
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@ -380,11 +381,11 @@ getnewvnode(tag, mp, vops, vpp)
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}
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if (vp) {
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vp->v_flag |= VDOOMED;
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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freevnodes--;
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/* see comment on why 0xdeadb is set at end of vgone (below) */
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vp->v_freelist.tqe_prev = (struct vnode **) 0xdeadb;
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simple_unlock(&vnode_free_list_slock);
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cache_purge(vp);
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vp->v_lease = NULL;
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if (vp->v_type != VBAD)
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vgonel(vp, p);
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@ -418,13 +419,13 @@ getnewvnode(tag, mp, vops, vpp)
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M_VNODE, M_WAITOK);
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bzero((char *) vp, sizeof *vp);
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vp->v_dd = vp;
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cache_purge(vp);
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LIST_INIT(&vp->v_cache_src);
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TAILQ_INIT(&vp->v_cache_dst);
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numvnodes++;
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}
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vp->v_type = VNON;
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cache_purge(vp);
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vp->v_tag = tag;
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vp->v_op = vops;
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insmntque(vp, mp);
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@ -582,7 +583,7 @@ bgetvp(vp, bp)
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if (bp->b_vp)
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panic("bgetvp: not free");
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VHOLD(vp);
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vhold(vp);
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bp->b_vp = vp;
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if (vp->v_type == VBLK || vp->v_type == VCHR)
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bp->b_dev = vp->v_rdev;
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@ -618,7 +619,7 @@ brelvp(bp)
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vp = bp->b_vp;
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bp->b_vp = (struct vnode *) 0;
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HOLDRELE(vp);
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vdrop(vp);
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}
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/*
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@ -678,8 +679,10 @@ reassignbuf(bp, newvp)
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/*
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* Delete from old vnode list, if on one.
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*/
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if (bp->b_vnbufs.le_next != NOLIST)
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if (bp->b_vnbufs.le_next != NOLIST) {
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bufremvn(bp);
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vdrop(bp->b_vp);
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}
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/*
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* If dirty, put on list of dirty buffers; otherwise insert onto list
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* of clean buffers.
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@ -700,6 +703,8 @@ reassignbuf(bp, newvp)
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} else {
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bufinsvn(bp, &newvp->v_cleanblkhd);
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}
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bp->b_vp = newvp;
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vhold(bp->b_vp);
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splx(s);
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}
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@ -836,13 +841,9 @@ vget(vp, flags, p)
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tsleep((caddr_t)vp, PINOD, "vget", 0);
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return (ENOENT);
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}
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if (vp->v_usecount == 0) {
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simple_lock(&vnode_free_list_slock);
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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simple_unlock(&vnode_free_list_slock);
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freevnodes--;
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}
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vp->v_usecount++;
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if (VSHOULDBUSY(vp))
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vbusy(vp);
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/*
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* Create the VM object, if needed
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*/
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@ -1089,11 +1090,11 @@ vputrele(vp, put)
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panic("vputrele: null vp");
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#endif
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simple_lock(&vp->v_interlock);
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vp->v_usecount--;
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if ((vp->v_usecount == 1) &&
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if ((vp->v_usecount == 2) &&
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vp->v_object &&
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(vp->v_object->flags & OBJ_VFS_REF)) {
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vp->v_usecount--;
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vp->v_object->flags &= ~OBJ_VFS_REF;
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if (put) {
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VOP_UNLOCK(vp, LK_INTERLOCK, p);
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@ -1104,7 +1105,8 @@ vputrele(vp, put)
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return;
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}
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if (vp->v_usecount > 0) {
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if (vp->v_usecount > 1) {
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vp->v_usecount--;
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if (put) {
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VOP_UNLOCK(vp, LK_INTERLOCK, p);
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} else {
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@ -1113,23 +1115,14 @@ vputrele(vp, put)
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return;
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}
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if (vp->v_usecount < 0) {
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if (vp->v_usecount < 1) {
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#ifdef DIAGNOSTIC
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vprint("vputrele: negative ref count", vp);
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#endif
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panic("vputrele: negative ref cnt");
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}
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simple_lock(&vnode_free_list_slock);
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if (vp->v_flag & VAGE) {
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vp->v_flag &= ~VAGE;
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if(vp->v_tag != VT_TFS)
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TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
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} else {
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if(vp->v_tag != VT_TFS)
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TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
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}
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freevnodes++;
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simple_unlock(&vnode_free_list_slock);
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vp->v_holdcnt++; /* Make sure vnode isn't recycled */
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/*
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* If we are doing a vput, the node is already locked, and we must
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@ -1139,8 +1132,18 @@ vputrele(vp, put)
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if (put) {
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simple_unlock(&vp->v_interlock);
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VOP_INACTIVE(vp, p);
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simple_lock(&vp->v_interlock);
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vp->v_usecount--;
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vp->v_holdcnt--;
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if (VSHOULDFREE(vp))
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vfree(vp);
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simple_unlock(&vp->v_interlock);
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} else if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) {
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VOP_INACTIVE(vp, p);
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vp->v_usecount--;
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vp->v_holdcnt--;
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if (VSHOULDFREE(vp))
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vfree(vp);
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}
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}
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@ -1161,9 +1164,8 @@ vrele(vp)
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vputrele(vp, 0);
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}
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#ifdef DIAGNOSTIC
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/*
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* Page or buffer structure gets a reference.
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* Somebody doesn't want the vnode recycled.
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*/
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void
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vhold(vp)
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@ -1172,14 +1174,16 @@ vhold(vp)
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simple_lock(&vp->v_interlock);
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vp->v_holdcnt++;
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if (VSHOULDBUSY(vp))
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vbusy(vp);
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simple_unlock(&vp->v_interlock);
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}
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/*
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* Page or buffer structure frees a reference.
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* One less who cares about this vnode.
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*/
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void
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holdrele(vp)
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vdrop(vp)
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register struct vnode *vp;
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{
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@ -1187,9 +1191,10 @@ holdrele(vp)
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if (vp->v_holdcnt <= 0)
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panic("holdrele: holdcnt");
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vp->v_holdcnt--;
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if (VSHOULDFREE(vp))
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vfree(vp);
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simple_unlock(&vp->v_interlock);
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}
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#endif /* DIAGNOSTIC */
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/*
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* Remove any vnodes in the vnode table belonging to mount point mp.
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@ -1572,17 +1577,11 @@ vgonel(vp, p)
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* after calling vgone. If the reference count were
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* incremented first, vgone would (incorrectly) try to
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* close the previous instance of the underlying object.
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* So, the back pointer is explicitly set to `0xdeadb' in
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* getnewvnode after removing it from the freelist to ensure
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* that we do not try to move it here.
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*/
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if (vp->v_usecount == 0) {
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if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) {
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simple_lock(&vnode_free_list_slock);
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if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
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vnode_free_list.tqh_first != vp) {
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
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}
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
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simple_unlock(&vnode_free_list_slock);
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}
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@ -1680,6 +1679,10 @@ vprint(label, vp)
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strcat(buf, "|VBWAIT");
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if (vp->v_flag & VALIASED)
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strcat(buf, "|VALIASED");
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if (vp->v_flag & VDOOMED)
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strcat(buf, "|VDOOMED");
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if (vp->v_flag & VFREE)
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strcat(buf, "|VFREE");
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if (buf[0] != '\0')
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printf(" flags (%s)", &buf[1]);
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if (vp->v_data == NULL) {
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@ -2255,20 +2258,28 @@ retn:
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}
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void
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vtouch(vp)
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vfree(vp)
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struct vnode *vp;
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{
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simple_lock(&vp->v_interlock);
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if (vp->v_usecount) {
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simple_unlock(&vp->v_interlock);
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return;
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simple_lock(&vnode_free_list_slock);
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if (vp->v_flag & VAGE) {
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TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
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} else {
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TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
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}
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if (simple_lock_try(&vnode_free_list_slock)) {
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if (vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) {
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
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}
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simple_unlock(&vnode_free_list_slock);
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}
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simple_unlock(&vp->v_interlock);
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freevnodes++;
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simple_unlock(&vnode_free_list_slock);
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vp->v_flag &= ~VAGE;
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vp->v_flag |= VFREE;
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}
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void
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vbusy(vp)
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struct vnode *vp;
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{
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simple_lock(&vnode_free_list_slock);
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
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freevnodes--;
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simple_unlock(&vnode_free_list_slock);
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vp->v_flag &= ~VFREE;
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}
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@ -36,7 +36,7 @@
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* SUCH DAMAGE.
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*
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* @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
|
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* $Id: vfs_subr.c,v 1.94 1997/08/26 04:36:17 dyson Exp $
|
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* $Id: vfs_subr.c,v 1.95 1997/08/26 11:59:20 bde Exp $
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*/
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|
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/*
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@ -103,6 +103,7 @@ int vttoif_tab[9] = {
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}
|
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TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */
|
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static u_long freevnodes = 0;
|
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SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, "");
|
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|
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struct mntlist mountlist; /* mounted filesystem list */
|
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struct simplelock mountlist_slock;
|
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@ -380,11 +381,11 @@ getnewvnode(tag, mp, vops, vpp)
|
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}
|
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|
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if (vp) {
|
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vp->v_flag |= VDOOMED;
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TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
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freevnodes--;
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/* see comment on why 0xdeadb is set at end of vgone (below) */
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vp->v_freelist.tqe_prev = (struct vnode **) 0xdeadb;
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simple_unlock(&vnode_free_list_slock);
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cache_purge(vp);
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vp->v_lease = NULL;
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if (vp->v_type != VBAD)
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vgonel(vp, p);
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@ -418,13 +419,13 @@ getnewvnode(tag, mp, vops, vpp)
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M_VNODE, M_WAITOK);
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bzero((char *) vp, sizeof *vp);
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vp->v_dd = vp;
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cache_purge(vp);
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LIST_INIT(&vp->v_cache_src);
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TAILQ_INIT(&vp->v_cache_dst);
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numvnodes++;
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}
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vp->v_type = VNON;
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cache_purge(vp);
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vp->v_tag = tag;
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vp->v_op = vops;
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insmntque(vp, mp);
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@ -582,7 +583,7 @@ bgetvp(vp, bp)
|
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|
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if (bp->b_vp)
|
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panic("bgetvp: not free");
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VHOLD(vp);
|
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vhold(vp);
|
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bp->b_vp = vp;
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if (vp->v_type == VBLK || vp->v_type == VCHR)
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bp->b_dev = vp->v_rdev;
|
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@ -618,7 +619,7 @@ brelvp(bp)
|
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|
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vp = bp->b_vp;
|
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bp->b_vp = (struct vnode *) 0;
|
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HOLDRELE(vp);
|
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vdrop(vp);
|
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}
|
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|
||||
/*
|
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@ -678,8 +679,10 @@ reassignbuf(bp, newvp)
|
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/*
|
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* Delete from old vnode list, if on one.
|
||||
*/
|
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if (bp->b_vnbufs.le_next != NOLIST)
|
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if (bp->b_vnbufs.le_next != NOLIST) {
|
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bufremvn(bp);
|
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vdrop(bp->b_vp);
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}
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/*
|
||||
* If dirty, put on list of dirty buffers; otherwise insert onto list
|
||||
* of clean buffers.
|
||||
@ -700,6 +703,8 @@ reassignbuf(bp, newvp)
|
||||
} else {
|
||||
bufinsvn(bp, &newvp->v_cleanblkhd);
|
||||
}
|
||||
bp->b_vp = newvp;
|
||||
vhold(bp->b_vp);
|
||||
splx(s);
|
||||
}
|
||||
|
||||
@ -836,13 +841,9 @@ vget(vp, flags, p)
|
||||
tsleep((caddr_t)vp, PINOD, "vget", 0);
|
||||
return (ENOENT);
|
||||
}
|
||||
if (vp->v_usecount == 0) {
|
||||
simple_lock(&vnode_free_list_slock);
|
||||
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
freevnodes--;
|
||||
}
|
||||
vp->v_usecount++;
|
||||
if (VSHOULDBUSY(vp))
|
||||
vbusy(vp);
|
||||
/*
|
||||
* Create the VM object, if needed
|
||||
*/
|
||||
@ -1089,11 +1090,11 @@ vputrele(vp, put)
|
||||
panic("vputrele: null vp");
|
||||
#endif
|
||||
simple_lock(&vp->v_interlock);
|
||||
vp->v_usecount--;
|
||||
|
||||
if ((vp->v_usecount == 1) &&
|
||||
if ((vp->v_usecount == 2) &&
|
||||
vp->v_object &&
|
||||
(vp->v_object->flags & OBJ_VFS_REF)) {
|
||||
vp->v_usecount--;
|
||||
vp->v_object->flags &= ~OBJ_VFS_REF;
|
||||
if (put) {
|
||||
VOP_UNLOCK(vp, LK_INTERLOCK, p);
|
||||
@ -1104,7 +1105,8 @@ vputrele(vp, put)
|
||||
return;
|
||||
}
|
||||
|
||||
if (vp->v_usecount > 0) {
|
||||
if (vp->v_usecount > 1) {
|
||||
vp->v_usecount--;
|
||||
if (put) {
|
||||
VOP_UNLOCK(vp, LK_INTERLOCK, p);
|
||||
} else {
|
||||
@ -1113,23 +1115,14 @@ vputrele(vp, put)
|
||||
return;
|
||||
}
|
||||
|
||||
if (vp->v_usecount < 0) {
|
||||
if (vp->v_usecount < 1) {
|
||||
#ifdef DIAGNOSTIC
|
||||
vprint("vputrele: negative ref count", vp);
|
||||
#endif
|
||||
panic("vputrele: negative ref cnt");
|
||||
}
|
||||
simple_lock(&vnode_free_list_slock);
|
||||
if (vp->v_flag & VAGE) {
|
||||
vp->v_flag &= ~VAGE;
|
||||
if(vp->v_tag != VT_TFS)
|
||||
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
||||
} else {
|
||||
if(vp->v_tag != VT_TFS)
|
||||
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
||||
}
|
||||
freevnodes++;
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
|
||||
vp->v_holdcnt++; /* Make sure vnode isn't recycled */
|
||||
|
||||
/*
|
||||
* If we are doing a vput, the node is already locked, and we must
|
||||
@ -1139,8 +1132,18 @@ vputrele(vp, put)
|
||||
if (put) {
|
||||
simple_unlock(&vp->v_interlock);
|
||||
VOP_INACTIVE(vp, p);
|
||||
simple_lock(&vp->v_interlock);
|
||||
vp->v_usecount--;
|
||||
vp->v_holdcnt--;
|
||||
if (VSHOULDFREE(vp))
|
||||
vfree(vp);
|
||||
simple_unlock(&vp->v_interlock);
|
||||
} else if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, p) == 0) {
|
||||
VOP_INACTIVE(vp, p);
|
||||
vp->v_usecount--;
|
||||
vp->v_holdcnt--;
|
||||
if (VSHOULDFREE(vp))
|
||||
vfree(vp);
|
||||
}
|
||||
}
|
||||
|
||||
@ -1161,9 +1164,8 @@ vrele(vp)
|
||||
vputrele(vp, 0);
|
||||
}
|
||||
|
||||
#ifdef DIAGNOSTIC
|
||||
/*
|
||||
* Page or buffer structure gets a reference.
|
||||
* Somebody doesn't want the vnode recycled.
|
||||
*/
|
||||
void
|
||||
vhold(vp)
|
||||
@ -1172,14 +1174,16 @@ vhold(vp)
|
||||
|
||||
simple_lock(&vp->v_interlock);
|
||||
vp->v_holdcnt++;
|
||||
if (VSHOULDBUSY(vp))
|
||||
vbusy(vp);
|
||||
simple_unlock(&vp->v_interlock);
|
||||
}
|
||||
|
||||
/*
|
||||
* Page or buffer structure frees a reference.
|
||||
* One less who cares about this vnode.
|
||||
*/
|
||||
void
|
||||
holdrele(vp)
|
||||
vdrop(vp)
|
||||
register struct vnode *vp;
|
||||
{
|
||||
|
||||
@ -1187,9 +1191,10 @@ holdrele(vp)
|
||||
if (vp->v_holdcnt <= 0)
|
||||
panic("holdrele: holdcnt");
|
||||
vp->v_holdcnt--;
|
||||
if (VSHOULDFREE(vp))
|
||||
vfree(vp);
|
||||
simple_unlock(&vp->v_interlock);
|
||||
}
|
||||
#endif /* DIAGNOSTIC */
|
||||
|
||||
/*
|
||||
* Remove any vnodes in the vnode table belonging to mount point mp.
|
||||
@ -1572,17 +1577,11 @@ vgonel(vp, p)
|
||||
* after calling vgone. If the reference count were
|
||||
* incremented first, vgone would (incorrectly) try to
|
||||
* close the previous instance of the underlying object.
|
||||
* So, the back pointer is explicitly set to `0xdeadb' in
|
||||
* getnewvnode after removing it from the freelist to ensure
|
||||
* that we do not try to move it here.
|
||||
*/
|
||||
if (vp->v_usecount == 0) {
|
||||
if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) {
|
||||
simple_lock(&vnode_free_list_slock);
|
||||
if ((vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) &&
|
||||
vnode_free_list.tqh_first != vp) {
|
||||
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
||||
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
||||
}
|
||||
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
||||
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
}
|
||||
|
||||
@ -1680,6 +1679,10 @@ vprint(label, vp)
|
||||
strcat(buf, "|VBWAIT");
|
||||
if (vp->v_flag & VALIASED)
|
||||
strcat(buf, "|VALIASED");
|
||||
if (vp->v_flag & VDOOMED)
|
||||
strcat(buf, "|VDOOMED");
|
||||
if (vp->v_flag & VFREE)
|
||||
strcat(buf, "|VFREE");
|
||||
if (buf[0] != '\0')
|
||||
printf(" flags (%s)", &buf[1]);
|
||||
if (vp->v_data == NULL) {
|
||||
@ -2255,20 +2258,28 @@ retn:
|
||||
}
|
||||
|
||||
void
|
||||
vtouch(vp)
|
||||
vfree(vp)
|
||||
struct vnode *vp;
|
||||
{
|
||||
simple_lock(&vp->v_interlock);
|
||||
if (vp->v_usecount) {
|
||||
simple_unlock(&vp->v_interlock);
|
||||
return;
|
||||
simple_lock(&vnode_free_list_slock);
|
||||
if (vp->v_flag & VAGE) {
|
||||
TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
|
||||
} else {
|
||||
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
||||
}
|
||||
if (simple_lock_try(&vnode_free_list_slock)) {
|
||||
if (vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) {
|
||||
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
||||
TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
|
||||
}
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
}
|
||||
simple_unlock(&vp->v_interlock);
|
||||
freevnodes++;
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
vp->v_flag &= ~VAGE;
|
||||
vp->v_flag |= VFREE;
|
||||
}
|
||||
|
||||
void
|
||||
vbusy(vp)
|
||||
struct vnode *vp;
|
||||
{
|
||||
simple_lock(&vnode_free_list_slock);
|
||||
TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
|
||||
freevnodes--;
|
||||
simple_unlock(&vnode_free_list_slock);
|
||||
vp->v_flag &= ~VFREE;
|
||||
}
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)vnode.h 8.7 (Berkeley) 2/4/94
|
||||
* $Id: vnode.h,v 1.45 1997/08/18 03:29:08 fsmp Exp $
|
||||
* $Id: vnode.h,v 1.46 1997/08/26 07:32:46 phk Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_VNODE_H_
|
||||
@ -141,6 +141,8 @@ struct vnode {
|
||||
#define VAGE 0x08000 /* Insert vnode at head of free list */
|
||||
#define VOLOCK 0x10000 /* vnode is locked waiting for an object */
|
||||
#define VOWANT 0x20000 /* a process is waiting for VOLOCK */
|
||||
#define VDOOMED 0x40000 /* This vnode is being recycled */
|
||||
#define VFREE 0x80000 /* This vnode is on the freelist */
|
||||
|
||||
/*
|
||||
* Vnode attributes. A field value of VNOVAL represents a field whose value
|
||||
@ -221,35 +223,12 @@ extern int vttoif_tab[];
|
||||
#define V_SAVEMETA 0x0002 /* vinvalbuf: leave indirect blocks */
|
||||
#define REVOKEALL 0x0001 /* vop_revoke: revoke all aliases */
|
||||
|
||||
#ifdef DIAGNOSTIC
|
||||
#define HOLDRELE(vp) holdrele(vp)
|
||||
#define VATTR_NULL(vap) vattr_null(vap)
|
||||
#define VHOLD(vp) vhold(vp)
|
||||
#define VREF(vp) vref(vp)
|
||||
|
||||
void holdrele __P((struct vnode *));
|
||||
void vhold __P((struct vnode *));
|
||||
void vref __P((struct vnode *vp));
|
||||
#ifdef DIAGNOSTIC
|
||||
#define VATTR_NULL(vap) vattr_null(vap)
|
||||
#else
|
||||
#define VATTR_NULL(vap) (*(vap) = va_null) /* initialize a vattr */
|
||||
#define HOLDRELE(vp) holdrele(vp) /* decrease buf or page ref */
|
||||
static __inline void
|
||||
holdrele(struct vnode *vp)
|
||||
{
|
||||
simple_lock(&vp->v_interlock);
|
||||
vp->v_holdcnt--;
|
||||
simple_unlock(&vp->v_interlock);
|
||||
}
|
||||
#define VHOLD(vp) vhold(vp) /* increase buf or page ref */
|
||||
static __inline void
|
||||
vhold(struct vnode *vp)
|
||||
{
|
||||
simple_lock(&vp->v_interlock);
|
||||
vp->v_holdcnt++;
|
||||
simple_unlock(&vp->v_interlock);
|
||||
}
|
||||
#define VREF(vp) vref(vp) /* increase reference */
|
||||
void vref __P((struct vnode *vp));
|
||||
#endif /* DIAGNOSTIC */
|
||||
|
||||
#define NULLVP ((struct vnode *)NULL)
|
||||
@ -288,6 +267,15 @@ extern void (*lease_updatetime) __P((int deltat));
|
||||
do { if(lease_updatetime) lease_updatetime(dt); } while(0)
|
||||
#endif /* NFS */
|
||||
|
||||
#define VSHOULDFREE(vp) \
|
||||
(!((vp)->v_flag & (VFREE|VDOOMED)) && \
|
||||
!(vp)->v_holdcnt && !(vp)->v_usecount)
|
||||
|
||||
#define VSHOULDBUSY(vp) \
|
||||
(((vp)->v_flag & VFREE) && \
|
||||
((vp)->v_holdcnt || (vp)->v_usecount))
|
||||
|
||||
|
||||
#endif /* KERNEL */
|
||||
|
||||
|
||||
@ -482,12 +470,16 @@ int getnewvnode __P((enum vtagtype tag,
|
||||
void insmntque __P((struct vnode *vp, struct mount *mp));
|
||||
int lease_check __P((struct vop_lease_args *ap));
|
||||
void vattr_null __P((struct vattr *vap));
|
||||
void vbusy __P((struct vnode *));
|
||||
int vcount __P((struct vnode *vp));
|
||||
void vdrop __P((struct vnode *));
|
||||
int vfinddev __P((dev_t dev, enum vtype type, struct vnode **vpp));
|
||||
void vfree __P((struct vnode *));
|
||||
void vfs_opv_init __P((struct vnodeopv_desc **them));
|
||||
int vflush __P((struct mount *mp, struct vnode *skipvp, int flags));
|
||||
int vget __P((struct vnode *vp, int lockflag, struct proc *p));
|
||||
void vgone __P((struct vnode *vp));
|
||||
void vhold __P((struct vnode *));
|
||||
int vinvalbuf __P((struct vnode *vp, int save, struct ucred *cred,
|
||||
struct proc *p, int slpflag, int slptimeo));
|
||||
void vprint __P((char *label, struct vnode *vp));
|
||||
@ -514,8 +506,8 @@ int vop_revoke __P((struct vop_revoke_args *));
|
||||
struct vnode *
|
||||
checkalias __P((struct vnode *vp, dev_t nvp_rdev, struct mount *mp));
|
||||
void vput __P((struct vnode *vp));
|
||||
void vref __P((struct vnode *vp));
|
||||
void vrele __P((struct vnode *vp));
|
||||
void vtouch __P((struct vnode *vp));
|
||||
#endif /* KERNEL */
|
||||
|
||||
#endif /* !_SYS_VNODE_H_ */
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)lfs_segment.c 8.10 (Berkeley) 6/10/95
|
||||
* $Id: lfs_segment.c,v 1.22 1997/06/15 17:56:46 dyson Exp $
|
||||
* $Id: lfs_segment.c,v 1.23 1997/08/02 14:33:20 bde Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -1222,7 +1222,7 @@ lfs_vref(vp)
|
||||
|
||||
if ((vp->v_flag & VXLOCK) || /* XXX */
|
||||
(vp->v_usecount == 0 &&
|
||||
vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb))
|
||||
vp->v_flag & VDOOMED))
|
||||
return(1);
|
||||
return (vget(vp, 0, p));
|
||||
}
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)vm_swap.c 8.5 (Berkeley) 2/17/94
|
||||
* $Id: vm_swap.c,v 1.42 1997/02/22 09:48:40 peter Exp $
|
||||
* $Id: vm_swap.c,v 1.43 1997/03/23 03:37:54 bde Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -136,7 +136,7 @@ swstrategy(bp)
|
||||
biodone(bp);
|
||||
return;
|
||||
}
|
||||
VHOLD(sp->sw_vp);
|
||||
vhold(sp->sw_vp);
|
||||
if ((bp->b_flags & B_READ) == 0) {
|
||||
vp = bp->b_vp;
|
||||
if (vp) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user