nfs_node.c revision 1.58
1 /* $NetBSD: nfs_node.c,v 1.58 2003/02/10 17:31:01 christos 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 1.58 2003/02/10 17:31:01 christos 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 struct nfsnodehashhead *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 MALLOC_DEFINE(M_NFSBIGFH, "NFS bigfh", "NFS big filehandle"); 74 MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part"); 75 76 extern int prtactive; 77 78 #define TRUE 1 79 #define FALSE 0 80 81 #define nfs_hash(x,y) hash32_buf((x), (y), HASH32_BUF_INIT) 82 83 void nfs_gop_size(struct vnode *, off_t, off_t *); 84 int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *); 85 int nfs_gop_write(struct vnode *, struct vm_page **, int, int); 86 87 struct genfs_ops nfs_genfsops = { 88 nfs_gop_size, 89 nfs_gop_alloc, 90 nfs_gop_write, 91 }; 92 93 /* 94 * Initialize hash links for nfsnodes 95 * and build nfsnode free list. 96 */ 97 void 98 nfs_nhinit() 99 { 100 101 nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, 102 M_WAITOK, &nfsnodehash); 103 lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0); 104 105 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 106 &pool_allocator_nointr); 107 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 108 &pool_allocator_nointr); 109 } 110 111 /* 112 * Reinitialize inode hash table. 113 */ 114 115 void 116 nfs_nhreinit() 117 { 118 struct nfsnode *np; 119 struct nfsnodehashhead *oldhash, *hash; 120 u_long oldmask, mask, val; 121 int i; 122 123 hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK, 124 &mask); 125 126 lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL); 127 oldhash = nfsnodehashtbl; 128 oldmask = nfsnodehash; 129 nfsnodehashtbl = hash; 130 nfsnodehash = mask; 131 for (i = 0; i <= oldmask; i++) { 132 while ((np = LIST_FIRST(&oldhash[i])) != NULL) { 133 LIST_REMOVE(np, n_hash); 134 val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize)); 135 LIST_INSERT_HEAD(&hash[val], np, n_hash); 136 } 137 } 138 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 139 hashdone(oldhash, M_NFSNODE); 140 } 141 142 /* 143 * Free resources previoslu allocated in nfs_nhinit(). 144 */ 145 void 146 nfs_nhdone() 147 { 148 hashdone(nfsnodehashtbl, M_NFSNODE); 149 pool_destroy(&nfs_node_pool); 150 pool_destroy(&nfs_vattr_pool); 151 } 152 153 /* 154 * Look up a vnode/nfsnode by file handle. 155 * Callers must check for mount points!! 156 * In all cases, a pointer to a 157 * nfsnode structure is returned. 158 */ 159 int 160 nfs_nget(mntp, fhp, fhsize, npp) 161 struct mount *mntp; 162 nfsfh_t *fhp; 163 int fhsize; 164 struct nfsnode **npp; 165 { 166 struct nfsnode *np; 167 struct nfsnodehashhead *nhpp; 168 struct vnode *vp; 169 struct vnode *nvp; 170 int error; 171 172 nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))]; 173 loop: 174 LIST_FOREACH(np, nhpp, n_hash) { 175 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize || 176 memcmp(fhp, np->n_fhp, fhsize)) 177 continue; 178 vp = NFSTOV(np); 179 if (vget(vp, LK_EXCLUSIVE)) 180 goto loop; 181 *npp = np; 182 return(0); 183 } 184 if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)) 185 goto loop; 186 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp); 187 if (error) { 188 *npp = 0; 189 lockmgr(&nfs_hashlock, LK_RELEASE, 0); 190 return (error); 191 } 192 vp = nvp; 193 np = pool_get(&nfs_node_pool, PR_WAITOK); 194 memset(np, 0, sizeof *np); 195 lockinit(&np->n_commitlock, PINOD, "nfsclock", 0, 0); 196 vp->v_data = np; 197 np->n_vnode = vp; 198 genfs_node_init(vp, &nfs_genfsops); 199 200 /* 201 * Insert the nfsnode in the hash queue for its new file handle 202 */ 203 204 LIST_INSERT_HEAD(nhpp, np, n_hash); 205 if (fhsize > NFS_SMALLFH) { 206 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK); 207 } else 208 np->n_fhp = &np->n_fh; 209 memcpy(np->n_fhp, fhp, fhsize); 210 np->n_fhsize = fhsize; 211 np->n_accstamp = -1; 212 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 213 lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL); 214 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 215 error = VOP_GETATTR(vp, np->n_vattr, curproc->p_ucred, curproc); 216 if (error) { 217 vput(vp); 218 return error; 219 } 220 uvm_vnp_setsize(vp, np->n_vattr->va_size); 221 *npp = np; 222 return (0); 223 } 224 225 int 226 nfs_inactive(v) 227 void *v; 228 { 229 struct vop_inactive_args /* { 230 struct vnode *a_vp; 231 struct proc *a_p; 232 } */ *ap = v; 233 struct nfsnode *np; 234 struct sillyrename *sp; 235 struct proc *p = ap->a_p; 236 struct vnode *vp = ap->a_vp; 237 238 np = VTONFS(vp); 239 if (prtactive && vp->v_usecount != 0) 240 vprint("nfs_inactive: pushing active", vp); 241 if (vp->v_type != VDIR) { 242 sp = np->n_sillyrename; 243 np->n_sillyrename = (struct sillyrename *)0; 244 } else 245 sp = NULL; 246 if (sp != NULL) 247 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1); 248 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED | 249 NQNFSNONCACHE | NQNFSWRITE); 250 VOP_UNLOCK(vp, 0); 251 if (sp != NULL) { 252 253 /* 254 * Remove the silly file that was rename'd earlier 255 */ 256 257 vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY); 258 nfs_removeit(sp); 259 crfree(sp->s_cred); 260 vput(sp->s_dvp); 261 FREE(sp, M_NFSREQ); 262 } 263 return (0); 264 } 265 266 /* 267 * Reclaim an nfsnode so that it can be used for other purposes. 268 */ 269 int 270 nfs_reclaim(v) 271 void *v; 272 { 273 struct vop_reclaim_args /* { 274 struct vnode *a_vp; 275 } */ *ap = v; 276 struct vnode *vp = ap->a_vp; 277 struct nfsnode *np = VTONFS(vp); 278 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 279 280 if (prtactive && vp->v_usecount != 0) 281 vprint("nfs_reclaim: pushing active", vp); 282 283 LIST_REMOVE(np, n_hash); 284 285 if ((nmp->nm_flag & NFSMNT_NQNFS) && np->n_timer.cqe_next != 0) { 286 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 287 } 288 289 /* 290 * Free up any directory cookie structures and 291 * large file handle structures that might be associated with 292 * this nfs node. 293 */ 294 if (vp->v_type == VDIR && np->n_dircache) { 295 nfs_invaldircache(vp, 1); 296 FREE(np->n_dircache, M_NFSDIROFF); 297 } 298 if (np->n_fhsize > NFS_SMALLFH) { 299 free(np->n_fhp, M_NFSBIGFH); 300 } 301 302 pool_put(&nfs_vattr_pool, np->n_vattr); 303 if (np->n_rcred) { 304 crfree(np->n_rcred); 305 } 306 if (np->n_wcred) { 307 crfree(np->n_wcred); 308 } 309 cache_purge(vp); 310 pool_put(&nfs_node_pool, vp->v_data); 311 vp->v_data = NULL; 312 return (0); 313 } 314 315 void 316 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp) 317 { 318 *eobp = MAX(size, vp->v_size); 319 } 320 321 int 322 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 323 struct ucred *cred) 324 { 325 return 0; 326 } 327 328 int 329 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) 330 { 331 int i; 332 333 for (i = 0; i < npages; i++) { 334 pmap_page_protect(pgs[i], VM_PROT_READ); 335 } 336 return genfs_gop_write(vp, pgs, npages, flags); 337 } 338
Indexes created Tue Sep 30 11:09:46 GMT 2025