nfs_node.c revision 1.52
1 /* $NetBSD: nfs_node.c,v 1.52 2002/03/08 20:48:45 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.52 2002/03/08 20:48:45 thorpej Exp $"); 43 44 #include "opt_nfs.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/namei.h> 51 #include <sys/vnode.h> 52 #include <sys/kernel.h> 53 #include <sys/malloc.h> 54 #include <sys/pool.h> 55 #include <sys/lock.h> 56 #include <sys/hash.h> 57 58 #include <nfs/rpcv2.h> 59 #include <nfs/nfsproto.h> 60 #include <nfs/nfs.h> 61 #include <nfs/nfsnode.h> 62 #include <nfs/nfsmount.h> 63 #include <nfs/nqnfs.h> 64 #include <nfs/nfs_var.h> 65 66 LIST_HEAD(nfsnodehashhead, nfsnode) *nfsnodehashtbl; 67 u_long nfsnodehash; 68 struct lock nfs_hashlock; 69 70 struct pool nfs_node_pool; /* memory pool for nfs nodes */ 71 struct pool nfs_vattr_pool; /* memory pool for nfs vattrs */ 72 73 extern int prtactive; 74 75 #define TRUE 1 76 #define FALSE 0 77 78 #define nfs_hash(x,y) hash32_buf((x), (y), HASH32_BUF_INIT) 79 80 void nfs_gop_size(struct vnode *, off_t, off_t *); 81 int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *); 82 83 struct genfs_ops nfs_genfsops = { 84 nfs_gop_size, 85 nfs_gop_alloc, 86 genfs_gop_write, 87 }; 88 89 /* 90 * Initialize hash links for nfsnodes 91 * and build nfsnode free list. 92 */ 93 void 94 nfs_nhinit() 95 { 96 97 nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, 98 M_WAITOK, &nfsnodehash); 99 lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0); 100 101 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 102 &pool_allocator_nointr); 103 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 104 &pool_allocator_nointr); 105 } 106 107 /* 108 * Reinitialize inode hash table. 109 */ 110 111 void 112 nfs_nhreinit() 113 { 114 struct nfsnode *np; 115 struct nfsnodehashhead *oldhash, *hash; 116 u_long oldmask, mask, val; 117 int i; 118 119 hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK, 120 &mask); 121 122 lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL); 123 oldhash = nfsnodehashtbl; 124 oldmask = nfsnodehash; 125 nfsnodehashtbl = hash; 126 nfsnodehash = mask; 127 for (i = 0; i <= oldmask; i++) { 128 while ((np = LIST_FIRST(&oldhash[i])) != NULL) { 129 LIST_REMOVE(np, n_hash); 130 val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize)); 131 LIST_INSERT_HEAD(&hash[val], np, n_hash); 132 } 133 } 134 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 135 hashdone(oldhash, M_NFSNODE); 136 } 137 138 /* 139 * Free resources previoslu allocated in nfs_nhinit(). 140 */ 141 void 142 nfs_nhdone() 143 { 144 hashdone(nfsnodehashtbl, M_NFSNODE); 145 pool_destroy(&nfs_node_pool); 146 pool_destroy(&nfs_vattr_pool); 147 } 148 149 /* 150 * Look up a vnode/nfsnode by file handle. 151 * Callers must check for mount points!! 152 * In all cases, a pointer to a 153 * nfsnode structure is returned. 154 */ 155 int 156 nfs_nget(mntp, fhp, fhsize, npp) 157 struct mount *mntp; 158 nfsfh_t *fhp; 159 int fhsize; 160 struct nfsnode **npp; 161 { 162 struct nfsnode *np; 163 struct nfsnodehashhead *nhpp; 164 struct vnode *vp; 165 struct vnode *nvp; 166 int error; 167 168 nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))]; 169 loop: 170 LIST_FOREACH(np, nhpp, n_hash) { 171 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize || 172 memcmp(fhp, np->n_fhp, fhsize)) 173 continue; 174 vp = NFSTOV(np); 175 if (vget(vp, LK_EXCLUSIVE)) 176 goto loop; 177 *npp = np; 178 return(0); 179 } 180 if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)) 181 goto loop; 182 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp); 183 if (error) { 184 *npp = 0; 185 lockmgr(&nfs_hashlock, LK_RELEASE, 0); 186 return (error); 187 } 188 vp = nvp; 189 np = pool_get(&nfs_node_pool, PR_WAITOK); 190 memset(np, 0, sizeof *np); 191 lockinit(&np->n_commitlock, PINOD, "nfsclock", 0, 0); 192 vp->v_data = np; 193 np->n_vnode = vp; 194 genfs_node_init(vp, &nfs_genfsops); 195 196 /* 197 * Insert the nfsnode in the hash queue for its new file handle 198 */ 199 200 LIST_INSERT_HEAD(nhpp, np, n_hash); 201 if (fhsize > NFS_SMALLFH) { 202 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK); 203 } else 204 np->n_fhp = &np->n_fh; 205 memcpy(np->n_fhp, fhp, fhsize); 206 np->n_fhsize = fhsize; 207 np->n_accstamp = -1; 208 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 209 lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL); 210 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 211 error = VOP_GETATTR(vp, np->n_vattr, curproc->p_ucred, curproc); 212 if (error) { 213 vput(vp); 214 return error; 215 } 216 uvm_vnp_setsize(vp, np->n_vattr->va_size); 217 *npp = np; 218 return (0); 219 } 220 221 int 222 nfs_inactive(v) 223 void *v; 224 { 225 struct vop_inactive_args /* { 226 struct vnode *a_vp; 227 struct proc *a_p; 228 } */ *ap = v; 229 struct nfsnode *np; 230 struct sillyrename *sp; 231 struct proc *p = ap->a_p; 232 struct vnode *vp = ap->a_vp; 233 234 np = VTONFS(vp); 235 if (prtactive && vp->v_usecount != 0) 236 vprint("nfs_inactive: pushing active", vp); 237 if (vp->v_type != VDIR) { 238 sp = np->n_sillyrename; 239 np->n_sillyrename = (struct sillyrename *)0; 240 } else 241 sp = NULL; 242 if (sp != NULL) 243 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1); 244 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED | 245 NQNFSNONCACHE | NQNFSWRITE); 246 VOP_UNLOCK(vp, 0); 247 if (sp != NULL) { 248 249 /* 250 * Remove the silly file that was rename'd earlier 251 */ 252 253 vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY); 254 nfs_removeit(sp); 255 crfree(sp->s_cred); 256 vput(sp->s_dvp); 257 FREE(sp, M_NFSREQ); 258 } 259 return (0); 260 } 261 262 /* 263 * Reclaim an nfsnode so that it can be used for other purposes. 264 */ 265 int 266 nfs_reclaim(v) 267 void *v; 268 { 269 struct vop_reclaim_args /* { 270 struct vnode *a_vp; 271 } */ *ap = v; 272 struct vnode *vp = ap->a_vp; 273 struct nfsnode *np = VTONFS(vp); 274 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 275 276 if (prtactive && vp->v_usecount != 0) 277 vprint("nfs_reclaim: pushing active", vp); 278 279 LIST_REMOVE(np, n_hash); 280 281 /* 282 * For nqnfs, take it off the timer queue as required. 283 */ 284 if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_timer.cqe_next != 0) { 285 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 286 } 287 288 /* 289 * Free up any directory cookie structures and 290 * large file handle structures that might be associated with 291 * this nfs node. 292 */ 293 if (vp->v_type == VDIR && np->n_dircache) { 294 nfs_invaldircache(vp, 1); 295 FREE(np->n_dircache, M_NFSDIROFF); 296 } 297 if (np->n_fhsize > NFS_SMALLFH) { 298 free(np->n_fhp, M_NFSBIGFH); 299 } 300 301 pool_put(&nfs_vattr_pool, np->n_vattr); 302 if (np->n_rcred) { 303 crfree(np->n_rcred); 304 } 305 if (np->n_wcred) { 306 crfree(np->n_wcred); 307 } 308 cache_purge(vp); 309 pool_put(&nfs_node_pool, vp->v_data); 310 vp->v_data = NULL; 311 return (0); 312 } 313 314 void 315 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp) 316 { 317 *eobp = MAX(size, vp->v_size); 318 } 319 320 int 321 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 322 struct ucred *cred) 323 { 324 return 0; 325 } 326
Indexes created Thu Sep 25 16:09:42 GMT 2025