1 /* $OpenBSD: nfs_node.c,v 1.66 2018/03/28 09:40:26 mpi Exp $ */ 2 /* $NetBSD: nfs_node.c,v 1.16 1996/02/18 11:53:42 fvdl Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 36 */ 37 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/timeout.h> 42 #include <sys/mount.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/lock.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/pool.h> 49 #include <sys/rwlock.h> 50 #include <sys/queue.h> 51 52 #include <nfs/rpcv2.h> 53 #include <nfs/nfsproto.h> 54 #include <nfs/nfsnode.h> 55 #include <nfs/nfsmount.h> 56 #include <nfs/nfs_var.h> 57 58 struct pool nfs_node_pool; 59 extern int prtactive; 60 61 /* XXX */ 62 extern struct vops nfs_vops; 63 64 /* filehandle to node lookup. */ 65 static __inline int 66 nfsnode_cmp(const struct nfsnode *a, const struct nfsnode *b) 67 { 68 if (a->n_fhsize != b->n_fhsize) 69 return (a->n_fhsize - b->n_fhsize); 70 return (memcmp(a->n_fhp, b->n_fhp, a->n_fhsize)); 71 } 72 73 RBT_PROTOTYPE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp); 74 RBT_GENERATE(nfs_nodetree, nfsnode, n_entry, nfsnode_cmp); 75 76 void 77 nfs_ninit(struct nfsmount *nmp) 78 { 79 RBT_INIT(nfs_nodetree, &nmp->nm_ntree); 80 } 81 82 /* 83 * Look up a vnode/nfsnode by file handle and store the pointer in *npp. 84 * Callers must check for mount points!! 85 * An error number is returned. 86 */ 87 int 88 nfs_nget(struct mount *mnt, nfsfh_t *fh, int fhsize, struct nfsnode **npp) 89 { 90 struct nfsmount *nmp; 91 struct nfsnode *np, find, *np2; 92 struct vnode *vp, *nvp; 93 struct proc *p = curproc; /* XXX */ 94 int error; 95 96 nmp = VFSTONFS(mnt); 97 98 loop: 99 find.n_fhp = fh; 100 find.n_fhsize = fhsize; 101 np = RBT_FIND(nfs_nodetree, &nmp->nm_ntree, &find); 102 if (np != NULL) { 103 vp = NFSTOV(np); 104 error = vget(vp, LK_EXCLUSIVE, p); 105 if (error) 106 goto loop; 107 *npp = np; 108 return (0); 109 } 110 111 /* 112 * getnewvnode() could recycle a vnode, potentially formerly 113 * owned by NFS. This will cause a VOP_RECLAIM() to happen, 114 * which will cause recursive locking, so we unlock before 115 * calling getnewvnode() lock again afterwards, but must check 116 * to see if this nfsnode has been added while we did not hold 117 * the lock. 118 */ 119 error = getnewvnode(VT_NFS, mnt, &nfs_vops, &nvp); 120 /* note that we don't have this vnode set up completely yet */ 121 if (error) { 122 *npp = NULL; 123 return (error); 124 } 125 nvp->v_flag |= VLARVAL; 126 np = pool_get(&nfs_node_pool, PR_WAITOK | PR_ZERO); 127 /* 128 * getnewvnode() and pool_get() can sleep, check for race. 129 */ 130 if (RBT_FIND(nfs_nodetree, &nmp->nm_ntree, &find) != NULL) { 131 pool_put(&nfs_node_pool, np); 132 vgone(nvp); 133 goto loop; 134 } 135 136 vp = nvp; 137 vp->v_data = np; 138 /* we now have an nfsnode on this vnode */ 139 vp->v_flag &= ~VLARVAL; 140 np->n_vnode = vp; 141 142 rw_init(&np->n_commitlock, "nfs_commitlk"); 143 144 /* 145 * Are we getting the root? If so, make sure the vnode flags 146 * are correct 147 */ 148 if ((fhsize == nmp->nm_fhsize) && !bcmp(fh, nmp->nm_fh, fhsize)) { 149 if (vp->v_type == VNON) 150 vp->v_type = VDIR; 151 vp->v_flag |= VROOT; 152 } 153 154 np->n_fhp = &np->n_fh; 155 bcopy(fh, np->n_fhp, fhsize); 156 np->n_fhsize = fhsize; 157 np2 = RBT_INSERT(nfs_nodetree, &nmp->nm_ntree, np); 158 KASSERT(np2 == NULL); 159 np->n_accstamp = -1; 160 *npp = np; 161 162 return (0); 163 } 164 165 int 166 nfs_inactive(void *v) 167 { 168 struct vop_inactive_args *ap = v; 169 struct nfsnode *np; 170 struct sillyrename *sp; 171 172 #ifdef DIAGNOSTIC 173 if (prtactive && ap->a_vp->v_usecount != 0) 174 vprint("nfs_inactive: pushing active", ap->a_vp); 175 #endif 176 if (ap->a_vp->v_flag & VLARVAL) 177 /* 178 * vnode was incompletely set up, just return 179 * as we are throwing it away. 180 */ 181 return(0); 182 #ifdef DIAGNOSTIC 183 if (ap->a_vp->v_data == NULL) 184 panic("NULL v_data (no nfsnode set up?) in vnode %p", 185 ap->a_vp); 186 #endif 187 np = VTONFS(ap->a_vp); 188 if (ap->a_vp->v_type != VDIR) { 189 sp = np->n_sillyrename; 190 np->n_sillyrename = NULL; 191 } else 192 sp = NULL; 193 if (sp) { 194 /* 195 * Remove the silly file that was rename'd earlier 196 */ 197 nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, curproc); 198 nfs_removeit(sp); 199 crfree(sp->s_cred); 200 vrele(sp->s_dvp); 201 free(sp, M_NFSREQ, sizeof(*sp)); 202 } 203 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT); 204 205 VOP_UNLOCK(ap->a_vp, ap->a_p); 206 return (0); 207 } 208 209 /* 210 * Reclaim an nfsnode so that it can be used for other purposes. 211 */ 212 int 213 nfs_reclaim(void *v) 214 { 215 struct vop_reclaim_args *ap = v; 216 struct vnode *vp = ap->a_vp; 217 struct nfsmount *nmp; 218 struct nfsnode *np = VTONFS(vp); 219 220 #ifdef DIAGNOSTIC 221 if (prtactive && vp->v_usecount != 0) 222 vprint("nfs_reclaim: pushing active", vp); 223 #endif 224 if (ap->a_vp->v_flag & VLARVAL) 225 /* 226 * vnode was incompletely set up, just return 227 * as we are throwing it away. 228 */ 229 return(0); 230 #ifdef DIAGNOSTIC 231 if (ap->a_vp->v_data == NULL) 232 panic("NULL v_data (no nfsnode set up?) in vnode %p", 233 ap->a_vp); 234 #endif 235 nmp = VFSTONFS(vp->v_mount); 236 RBT_REMOVE(nfs_nodetree, &nmp->nm_ntree, np); 237 238 if (np->n_rcred) 239 crfree(np->n_rcred); 240 if (np->n_wcred) 241 crfree(np->n_wcred); 242 243 cache_purge(vp); 244 pool_put(&nfs_node_pool, vp->v_data); 245 vp->v_data = NULL; 246 247 return (0); 248 } 249