1 /* $OpenBSD: nfs_node.c,v 1.42 2008/08/09 10:14:02 thib 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/proc.h> 42 #include <sys/mount.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/kernel.h> 46 #include <sys/malloc.h> 47 #include <sys/pool.h> 48 #include <sys/hash.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/nfs.h> 55 #include <nfs/nfsnode.h> 56 #include <nfs/nfsmount.h> 57 #include <nfs/nfs_var.h> 58 59 LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl; 60 u_long nfsnodehash; 61 struct rwlock nfs_hashlock = RWLOCK_INITIALIZER("nfshshlk"); 62 63 struct pool nfs_node_pool; 64 65 extern int prtactive; 66 67 #define TRUE 1 68 #define FALSE 0 69 70 #define nfs_hash(x,y) hash32_buf((x), (y), HASHINIT) 71 72 /* 73 * Initialize hash links for nfsnodes 74 * and build nfsnode free list. 75 */ 76 void 77 nfs_nhinit() 78 { 79 nfsnodehashtbl = hashinit(desiredvnodes, M_NFSNODE, M_WAITOK, &nfsnodehash); 80 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 81 &pool_allocator_nointr); 82 } 83 84 /* 85 * Look up a vnode/nfsnode by file handle. 86 * Callers must check for mount points!! 87 * In all cases, a pointer to a 88 * nfsnode structure is returned. 89 */ 90 int 91 nfs_nget(mntp, fhp, fhsize, npp) 92 struct mount *mntp; 93 nfsfh_t *fhp; 94 int fhsize; 95 struct nfsnode **npp; 96 { 97 struct proc *p = curproc; /* XXX */ 98 struct nfsnode *np; 99 struct nfsnodehashhead *nhpp; 100 struct vnode *vp; 101 extern int (**nfsv2_vnodeop_p)(void *); 102 struct vnode *nvp; 103 int error; 104 105 nhpp = NFSNOHASH(nfs_hash(fhp, fhsize)); 106 loop: 107 LIST_FOREACH(np, nhpp, n_hash) { 108 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize || 109 bcmp((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize)) 110 continue; 111 vp = NFSTOV(np); 112 if (vget(vp, LK_EXCLUSIVE, p)) 113 goto loop; 114 *npp = np; 115 return(0); 116 } 117 if (rw_enter(&nfs_hashlock, RW_WRITE|RW_SLEEPFAIL)) 118 goto loop; 119 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp); 120 if (error) { 121 *npp = 0; 122 rw_exit(&nfs_hashlock); 123 return (error); 124 } 125 vp = nvp; 126 np = pool_get(&nfs_node_pool, PR_WAITOK | PR_ZERO); 127 vp->v_data = np; 128 np->n_vnode = vp; 129 130 rw_init(&np->n_commitlock, "nfs_commitlk"); 131 132 /* 133 * Are we getting the root? If so, make sure the vnode flags 134 * are correct 135 */ 136 { 137 struct nfsmount *nmp = VFSTONFS(mntp); 138 if ((fhsize == nmp->nm_fhsize) && 139 !bcmp(fhp, nmp->nm_fh, fhsize)) { 140 if (vp->v_type == VNON) 141 vp->v_type = VDIR; 142 vp->v_flag |= VROOT; 143 } 144 } 145 146 LIST_INSERT_HEAD(nhpp, np, n_hash); 147 np->n_fhp = &np->n_fh; 148 bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize); 149 np->n_fhsize = fhsize; 150 np->n_accstamp = -1; 151 rw_exit(&nfs_hashlock); 152 *npp = np; 153 return (0); 154 } 155 156 int 157 nfs_inactive(v) 158 void *v; 159 { 160 struct vop_inactive_args *ap = v; 161 struct nfsnode *np; 162 struct sillyrename *sp; 163 struct proc *p = curproc; /* XXX */ 164 165 np = VTONFS(ap->a_vp); 166 167 #ifdef DIAGNOSTIC 168 if (prtactive && ap->a_vp->v_usecount != 0) 169 vprint("nfs_inactive: pushing active", ap->a_vp); 170 #endif 171 172 if (ap->a_vp->v_type != VDIR) { 173 sp = np->n_sillyrename; 174 np->n_sillyrename = (struct sillyrename *)0; 175 } else 176 sp = (struct sillyrename *)0; 177 if (sp) { 178 /* 179 * Remove the silly file that was rename'd earlier 180 */ 181 nfs_vinvalbuf(ap->a_vp, 0, sp->s_cred, p); 182 nfs_removeit(sp); 183 crfree(sp->s_cred); 184 vrele(sp->s_dvp); 185 free(sp, M_NFSREQ); 186 } 187 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT); 188 189 VOP_UNLOCK(ap->a_vp, 0, ap->a_p); 190 return (0); 191 } 192 193 /* 194 * Reclaim an nfsnode so that it can be used for other purposes. 195 */ 196 int 197 nfs_reclaim(v) 198 void *v; 199 { 200 struct vop_reclaim_args *ap = v; 201 struct vnode *vp = ap->a_vp; 202 struct nfsnode *np = VTONFS(vp); 203 204 #ifdef DIAGNOSTIC 205 if (prtactive && vp->v_usecount != 0) 206 vprint("nfs_reclaim: pushing active", vp); 207 #endif 208 209 if (np->n_hash.le_prev != NULL) 210 LIST_REMOVE(np, n_hash); 211 212 if (np->n_rcred) 213 crfree(np->n_rcred); 214 if (np->n_wcred) 215 crfree(np->n_wcred); 216 cache_purge(vp); 217 pool_put(&nfs_node_pool, vp->v_data); 218 vp->v_data = NULL; 219 return (0); 220 } 221