nfs_node.c revision 1.76
1 /* $NetBSD: nfs_node.c,v 1.76 2004/04/20 11:51:28 yamt 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_node.c 8.6 (Berkeley) 5/22/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_node.c,v 1.76 2004/04/20 11:51:28 yamt Exp $"); 39 40 #include "opt_nfs.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/mount.h> 46 #include <sys/namei.h> 47 #include <sys/vnode.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/pool.h> 51 #include <sys/lock.h> 52 #include <sys/hash.h> 53 54 #include <nfs/rpcv2.h> 55 #include <nfs/nfsproto.h> 56 #include <nfs/nfs.h> 57 #include <nfs/nfsnode.h> 58 #include <nfs/nfsmount.h> 59 #include <nfs/nqnfs.h> 60 #include <nfs/nfs_var.h> 61 62 struct nfsnodehashhead *nfsnodehashtbl; 63 u_long nfsnodehash; 64 struct lock nfs_hashlock; 65 66 struct pool nfs_node_pool; /* memory pool for nfs nodes */ 67 struct pool nfs_vattr_pool; /* memory pool for nfs vattrs */ 68 69 MALLOC_DEFINE(M_NFSBIGFH, "NFS bigfh", "NFS big filehandle"); 70 MALLOC_DEFINE(M_NFSNODE, "NFS node", "NFS vnode private part"); 71 72 extern int prtactive; 73 74 #define nfs_hash(x,y) hash32_buf((x), (y), HASH32_BUF_INIT) 75 76 void nfs_gop_size(struct vnode *, off_t, off_t *, int); 77 int nfs_gop_alloc(struct vnode *, off_t, off_t, int, struct ucred *); 78 int nfs_gop_write(struct vnode *, struct vm_page **, int, int); 79 80 struct genfs_ops nfs_genfsops = { 81 nfs_gop_size, 82 nfs_gop_alloc, 83 nfs_gop_write, 84 }; 85 86 /* 87 * Initialize hash links for nfsnodes 88 * and build nfsnode free list. 89 */ 90 void 91 nfs_nhinit() 92 { 93 94 nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, 95 M_WAITOK, &nfsnodehash); 96 lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0); 97 98 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 99 &pool_allocator_nointr); 100 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 101 &pool_allocator_nointr); 102 } 103 104 /* 105 * Reinitialize inode hash table. 106 */ 107 108 void 109 nfs_nhreinit() 110 { 111 struct nfsnode *np; 112 struct nfsnodehashhead *oldhash, *hash; 113 u_long oldmask, mask, val; 114 int i; 115 116 hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK, 117 &mask); 118 119 lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL); 120 oldhash = nfsnodehashtbl; 121 oldmask = nfsnodehash; 122 nfsnodehashtbl = hash; 123 nfsnodehash = mask; 124 for (i = 0; i <= oldmask; i++) { 125 while ((np = LIST_FIRST(&oldhash[i])) != NULL) { 126 LIST_REMOVE(np, n_hash); 127 val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize)); 128 LIST_INSERT_HEAD(&hash[val], np, n_hash); 129 } 130 } 131 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 132 hashdone(oldhash, M_NFSNODE); 133 } 134 135 /* 136 * Free resources previoslu allocated in nfs_nhinit(). 137 */ 138 void 139 nfs_nhdone() 140 { 141 hashdone(nfsnodehashtbl, M_NFSNODE); 142 pool_destroy(&nfs_node_pool); 143 pool_destroy(&nfs_vattr_pool); 144 } 145 146 /* 147 * Look up a vnode/nfsnode by file handle. 148 * Callers must check for mount points!! 149 * In all cases, a pointer to a 150 * nfsnode structure is returned. 151 */ 152 int 153 nfs_nget1(mntp, fhp, fhsize, npp, lkflags) 154 struct mount *mntp; 155 nfsfh_t *fhp; 156 int fhsize; 157 struct nfsnode **npp; 158 int lkflags; 159 { 160 struct nfsnode *np; 161 struct nfsnodehashhead *nhpp; 162 struct vnode *vp; 163 int error; 164 165 nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))]; 166 loop: 167 LIST_FOREACH(np, nhpp, n_hash) { 168 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize || 169 memcmp(fhp, np->n_fhp, fhsize)) 170 continue; 171 vp = NFSTOV(np); 172 error = vget(vp, LK_EXCLUSIVE | lkflags); 173 if (error == EBUSY) 174 return error; 175 if (error) 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, &vp); 183 if (error) { 184 *npp = 0; 185 lockmgr(&nfs_hashlock, LK_RELEASE, 0); 186 return (error); 187 } 188 np = pool_get(&nfs_node_pool, PR_WAITOK); 189 memset(np, 0, sizeof *np); 190 vp->v_data = np; 191 np->n_vnode = vp; 192 genfs_node_init(vp, &nfs_genfsops); 193 194 /* 195 * Insert the nfsnode in the hash queue for its new file handle 196 */ 197 198 LIST_INSERT_HEAD(nhpp, np, n_hash); 199 if (fhsize > NFS_SMALLFH) { 200 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK); 201 } else 202 np->n_fhp = &np->n_fh; 203 memcpy(np->n_fhp, fhp, fhsize); 204 np->n_fhsize = fhsize; 205 np->n_accstamp = -1; 206 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 207 208 /* 209 * Initalize read/write creds to useful values. VOP_OPEN will 210 * overwrite these. 211 */ 212 np->n_rcred = curproc->p_ucred; 213 crhold(np->n_rcred); 214 np->n_wcred = curproc->p_ucred; 215 crhold(np->n_wcred); 216 lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL); 217 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 218 NFS_INVALIDATE_ATTRCACHE(np); 219 uvm_vnp_setsize(vp, 0); 220 *npp = np; 221 return (0); 222 } 223 224 int 225 nfs_inactive(v) 226 void *v; 227 { 228 struct vop_inactive_args /* { 229 struct vnode *a_vp; 230 struct proc *a_p; 231 } */ *ap = v; 232 struct nfsnode *np; 233 struct sillyrename *sp; 234 struct proc *p = ap->a_p; 235 struct vnode *vp = ap->a_vp; 236 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 237 boolean_t removed; 238 int err; 239 240 np = VTONFS(vp); 241 if (prtactive && vp->v_usecount != 0) 242 vprint("nfs_inactive: pushing active", vp); 243 if (vp->v_type != VDIR) { 244 sp = np->n_sillyrename; 245 np->n_sillyrename = (struct sillyrename *)0; 246 } else 247 sp = NULL; 248 if (sp != NULL) 249 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1); 250 removed = (np->n_flag & NREMOVED) != 0; 251 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED | 252 NQNFSNONCACHE | NQNFSWRITE); 253 254 if ((nmp->nm_flag & NFSMNT_NQNFS) && CIRCLEQ_NEXT(np, n_timer) != 0) { 255 CIRCLEQ_REMOVE(&nmp->nm_timerhead, np, n_timer); 256 } 257 258 if (vp->v_type == VDIR && np->n_dircache) 259 nfs_invaldircache(vp, 1); 260 261 VOP_UNLOCK(vp, 0); 262 263 /* XXXMP only kernel_lock protects vp */ 264 if (removed) 265 vrecycle(vp, NULL, p); 266 267 if (sp != NULL) { 268 269 /* 270 * Remove the silly file that was rename'd earlier 271 * 272 * Just in case our thread also has the parent node locked, 273 * we let vn_lock() fail. 274 */ 275 276 err = vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY 277 | LK_RECURSEFAIL); 278 nfs_removeit(sp); 279 crfree(sp->s_cred); 280 if (err != EDEADLK) 281 vput(sp->s_dvp); 282 else 283 vrele(sp->s_dvp); 284 FREE(sp, M_NFSREQ); 285 } 286 287 return (0); 288 } 289 290 /* 291 * Reclaim an nfsnode so that it can be used for other purposes. 292 */ 293 int 294 nfs_reclaim(v) 295 void *v; 296 { 297 struct vop_reclaim_args /* { 298 struct vnode *a_vp; 299 } */ *ap = v; 300 struct vnode *vp = ap->a_vp; 301 struct nfsnode *np = VTONFS(vp); 302 303 if (prtactive && vp->v_usecount != 0) 304 vprint("nfs_reclaim: pushing active", vp); 305 306 LIST_REMOVE(np, n_hash); 307 308 /* 309 * Free up any directory cookie structures and 310 * large file handle structures that might be associated with 311 * this nfs node. 312 */ 313 if (vp->v_type == VDIR && np->n_dircache) 314 hashdone(np->n_dircache, M_NFSDIROFF); 315 KASSERT(np->n_dirgens == NULL); 316 317 if (np->n_fhsize > NFS_SMALLFH) 318 free(np->n_fhp, M_NFSBIGFH); 319 320 pool_put(&nfs_vattr_pool, np->n_vattr); 321 if (np->n_rcred) 322 crfree(np->n_rcred); 323 324 if (np->n_wcred) 325 crfree(np->n_wcred); 326 327 cache_purge(vp); 328 pool_put(&nfs_node_pool, vp->v_data); 329 vp->v_data = NULL; 330 return (0); 331 } 332 333 void 334 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) 335 { 336 KASSERT(flags & (GOP_SIZE_READ | GOP_SIZE_WRITE)); 337 KASSERT((flags & (GOP_SIZE_READ | GOP_SIZE_WRITE)) 338 != (GOP_SIZE_READ | GOP_SIZE_WRITE)); 339 *eobp = MAX(size, vp->v_size); 340 } 341 342 int 343 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 344 struct ucred *cred) 345 { 346 return 0; 347 } 348 349 int 350 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) 351 { 352 int i; 353 354 for (i = 0; i < npages; i++) { 355 pmap_page_protect(pgs[i], VM_PROT_READ); 356 } 357 return genfs_gop_write(vp, pgs, npages, flags); 358 } 359
Indexes created Wed Sep 24 05:09:52 GMT 2025