/* $OpenBSD: nfs_node.c,v 1.70 2018/05/27 06:02:15 visa Exp $ */ /* $NetBSD: nfs_node.c,v 1.16 1996/02/18 11:53:42 fvdl Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Rick Macklem at The University of Guelph. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct pool nfs_node_pool; extern int prtactive; /* XXX */ extern struct vops nfs_vops; /* filehandle to node lookup. */ static __inline int nfsnode_cmp(const struct nfsnode *a, const struct nfsnode *b) { if (a->n_fhsize != b->n_fhsize) return (a->n_fhsize - b->n_fhsize); return (memcmp(a->n_fhp, b->n_fhp, a->n_fhsize)); } RBT_PROTOTYPE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp); RBT_GENERATE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp); void nfs_ninit(struct nfsmount *nmp) { RBT_INIT(nfs_nodetree, &nmp->nm_ntree); } /* * Look up a vnode/nfsnode by file handle and store the pointer in *npp. * Callers must check for mount points!! * An error number is returned. */ int nfs_nget(struct mount *mnt, nfsfh_t *fh, int fhsize, struct nfsnode **npp) { struct nfsmount *nmp; struct nfsnode *np, find, *np2; struct vnode *vp, *nvp; int error; nmp = VFSTONFS(mnt); loop: find.n_fhp = fh; find.n_fhsize = fhsize; np = RBT_FIND(nfs_nodetree, &nmp->nm_ntree, &find); if (np != NULL) { vp = NFSTOV(np); error = vget(vp, LK_EXCLUSIVE); if (error) goto loop; *npp = np; return (0); } /* * getnewvnode() could recycle a vnode, potentially formerly * owned by NFS. This will cause a VOP_RECLAIM() to happen, * which will cause recursive locking, so we unlock before * calling getnewvnode() lock again afterwards, but must check * to see if this nfsnode has been added while we did not hold * the lock. */ error = getnewvnode(VT_NFS, mnt, &nfs_vops, &nvp); /* note that we don't have this vnode set up completely yet */ if (error) { *npp = NULL; return (error); } nvp->v_flag |= VLARVAL; np = pool_get(&nfs_node_pool, PR_WAITOK | PR_ZERO); /* * getnewvnode() and pool_get() can sleep, check for race. */ if (RBT_FIND(nfs_nodetree, &nmp->nm_ntree, &find) != NULL) { pool_put(&nfs_node_pool, np); vgone(nvp); goto loop; } vp = nvp; #ifdef VFSLCKDEBUG vp->v_flag |= VLOCKSWORK; #endif rrw_init_flags(&np->n_lock, "nfsnode", RWL_DUPOK | RWL_IS_VNODE); vp->v_data = np; /* we now have an nfsnode on this vnode */ vp->v_flag &= ~VLARVAL; np->n_vnode = vp; rw_init(&np->n_commitlock, "nfs_commitlk"); np->n_fhp = &np->n_fh; bcopy(fh, np->n_fhp, fhsize); np->n_fhsize = fhsize; /* lock the nfsnode, then put it on the rbtree */ rrw_enter(&np->n_lock, RW_WRITE); np2 = RBT_INSERT(nfs_nodetree, &nmp->nm_ntree, np); KASSERT(np2 == NULL); np->n_accstamp = -1; *npp = np; return (0); } int nfs_inactive(void *v) { struct vop_inactive_args *ap = v; struct nfsnode *np; struct sillyrename *sp; #ifdef DIAGNOSTIC if (prtactive && ap->a_vp->v_usecount != 0) vprint("nfs_inactive: pushing active", ap->a_vp); #endif if (ap->a_vp->v_flag & VLARVAL) /* * vnode was incompletely set up, just return * as we are throwing it away. */ return(0); #ifdef DIAGNOSTIC if (ap->a_vp->v_data == NULL) panic("NULL v_data (no nfsnode set up?) in vnode %p", ap->a_vp); #endif np = VTONFS(ap->a_vp); if (ap->a_vp->v_type != VDIR) { sp = np->n_sillyrename; np->n_sillyrename = NULL; } else sp = NULL; if (sp) { /* * Remove the silly file that was rename'd earlier */ nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, curproc); vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY); nfs_removeit(sp); crfree(sp->s_cred); vput(sp->s_dvp); free(sp, M_NFSREQ, sizeof(*sp)); } np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT); VOP_UNLOCK(ap->a_vp); return (0); } /* * Reclaim an nfsnode so that it can be used for other purposes. */ int nfs_reclaim(void *v) { struct vop_reclaim_args *ap = v; struct vnode *vp = ap->a_vp; struct nfsmount *nmp; struct nfsnode *np = VTONFS(vp); #ifdef DIAGNOSTIC if (prtactive && vp->v_usecount != 0) vprint("nfs_reclaim: pushing active", vp); #endif if (ap->a_vp->v_flag & VLARVAL) /* * vnode was incompletely set up, just return * as we are throwing it away. */ return(0); #ifdef DIAGNOSTIC if (ap->a_vp->v_data == NULL) panic("NULL v_data (no nfsnode set up?) in vnode %p", ap->a_vp); #endif nmp = VFSTONFS(vp->v_mount); RBT_REMOVE(nfs_nodetree, &nmp->nm_ntree, np); if (np->n_rcred) crfree(np->n_rcred); if (np->n_wcred) crfree(np->n_wcred); cache_purge(vp); pool_put(&nfs_node_pool, vp->v_data); vp->v_data = NULL; return (0); }