1 /* $NetBSD: nfs_node.c,v 1.53 2002/03/16 23:05:25 chs 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 1.53 2002/03/16 23:05:25 chs 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 int nfs_gop_write(struct vnode *, struct vm_page **, int, int); 83 84 struct genfs_ops nfs_genfsops = { 85 nfs_gop_size, 86 nfs_gop_alloc, 87 nfs_gop_write, 88 }; 89 90 /* 91 * Initialize hash links for nfsnodes 92 * and build nfsnode free list. 93 */ 94 void 95 nfs_nhinit() 96 { 97 98 nfsnodehashtbl = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, 99 M_WAITOK, &nfsnodehash); 100 lockinit(&nfs_hashlock, PINOD, "nfs_hashlock", 0, 0); 101 102 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 103 &pool_allocator_nointr); 104 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 105 &pool_allocator_nointr); 106 } 107 108 /* 109 * Reinitialize inode hash table. 110 */ 111 112 void 113 nfs_nhreinit() 114 { 115 struct nfsnode *np; 116 struct nfsnodehashhead *oldhash, *hash; 117 u_long oldmask, mask, val; 118 int i; 119 120 hash = hashinit(desiredvnodes, HASH_LIST, M_NFSNODE, M_WAITOK, 121 &mask); 122 123 lockmgr(&nfs_hashlock, LK_EXCLUSIVE, NULL); 124 oldhash = nfsnodehashtbl; 125 oldmask = nfsnodehash; 126 nfsnodehashtbl = hash; 127 nfsnodehash = mask; 128 for (i = 0; i <= oldmask; i++) { 129 while ((np = LIST_FIRST(&oldhash[i])) != NULL) { 130 LIST_REMOVE(np, n_hash); 131 val = NFSNOHASH(nfs_hash(np->n_fhp, np->n_fhsize)); 132 LIST_INSERT_HEAD(&hash[val], np, n_hash); 133 } 134 } 135 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 136 hashdone(oldhash, M_NFSNODE); 137 } 138 139 /* 140 * Free resources previoslu allocated in nfs_nhinit(). 141 */ 142 void 143 nfs_nhdone() 144 { 145 hashdone(nfsnodehashtbl, M_NFSNODE); 146 pool_destroy(&nfs_node_pool); 147 pool_destroy(&nfs_vattr_pool); 148 } 149 150 /* 151 * Look up a vnode/nfsnode by file handle. 152 * Callers must check for mount points!! 153 * In all cases, a pointer to a 154 * nfsnode structure is returned. 155 */ 156 int 157 nfs_nget(mntp, fhp, fhsize, npp) 158 struct mount *mntp; 159 nfsfh_t *fhp; 160 int fhsize; 161 struct nfsnode **npp; 162 { 163 struct nfsnode *np; 164 struct nfsnodehashhead *nhpp; 165 struct vnode *vp; 166 struct vnode *nvp; 167 int error; 168 169 nhpp = &nfsnodehashtbl[NFSNOHASH(nfs_hash(fhp, fhsize))]; 170 loop: 171 LIST_FOREACH(np, nhpp, n_hash) { 172 if (mntp != NFSTOV(np)->v_mount || np->n_fhsize != fhsize || 173 memcmp(fhp, np->n_fhp, fhsize)) 174 continue; 175 vp = NFSTOV(np); 176 if (vget(vp, LK_EXCLUSIVE)) 177 goto loop; 178 *npp = np; 179 return(0); 180 } 181 if (lockmgr(&nfs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)) 182 goto loop; 183 error = getnewvnode(VT_NFS, mntp, nfsv2_vnodeop_p, &nvp); 184 if (error) { 185 *npp = 0; 186 lockmgr(&nfs_hashlock, LK_RELEASE, 0); 187 return (error); 188 } 189 vp = nvp; 190 np = pool_get(&nfs_node_pool, PR_WAITOK); 191 memset(np, 0, sizeof *np); 192 lockinit(&np->n_commitlock, PINOD, "nfsclock", 0, 0); 193 vp->v_data = np; 194 np->n_vnode = vp; 195 genfs_node_init(vp, &nfs_genfsops); 196 197 /* 198 * Insert the nfsnode in the hash queue for its new file handle 199 */ 200 201 LIST_INSERT_HEAD(nhpp, np, n_hash); 202 if (fhsize > NFS_SMALLFH) { 203 np->n_fhp = malloc(fhsize, M_NFSBIGFH, M_WAITOK); 204 } else 205 np->n_fhp = &np->n_fh; 206 memcpy(np->n_fhp, fhp, fhsize); 207 np->n_fhsize = fhsize; 208 np->n_accstamp = -1; 209 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 210 lockmgr(&vp->v_lock, LK_EXCLUSIVE, NULL); 211 lockmgr(&nfs_hashlock, LK_RELEASE, NULL); 212 error = VOP_GETATTR(vp, np->n_vattr, curproc->p_ucred, curproc); 213 if (error) { 214 vput(vp); 215 return error; 216 } 217 uvm_vnp_setsize(vp, np->n_vattr->va_size); 218 *npp = np; 219 return (0); 220 } 221 222 int 223 nfs_inactive(v) 224 void *v; 225 { 226 struct vop_inactive_args /* { 227 struct vnode *a_vp; 228 struct proc *a_p; 229 } */ *ap = v; 230 struct nfsnode *np; 231 struct sillyrename *sp; 232 struct proc *p = ap->a_p; 233 struct vnode *vp = ap->a_vp; 234 235 np = VTONFS(vp); 236 if (prtactive && vp->v_usecount != 0) 237 vprint("nfs_inactive: pushing active", vp); 238 if (vp->v_type != VDIR) { 239 sp = np->n_sillyrename; 240 np->n_sillyrename = (struct sillyrename *)0; 241 } else 242 sp = NULL; 243 if (sp != NULL) 244 nfs_vinvalbuf(vp, 0, sp->s_cred, p, 1); 245 np->n_flag &= (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NQNFSEVICTED | 246 NQNFSNONCACHE | NQNFSWRITE); 247 VOP_UNLOCK(vp, 0); 248 if (sp != NULL) { 249 250 /* 251 * Remove the silly file that was rename'd earlier 252 */ 253 254 vn_lock(sp->s_dvp, LK_EXCLUSIVE | LK_RETRY); 255 nfs_removeit(sp); 256 crfree(sp->s_cred); 257 vput(sp->s_dvp); 258 FREE(sp, M_NFSREQ); 259 } 260 return (0); 261 } 262 263 /* 264 * Reclaim an nfsnode so that it can be used for other purposes. 265 */ 266 int 267 nfs_reclaim(v) 268 void *v; 269 { 270 struct vop_reclaim_args /* { 271 struct vnode *a_vp; 272 } */ *ap = v; 273 struct vnode *vp = ap->a_vp; 274 struct nfsnode *np = VTONFS(vp); 275 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 276 277 if (prtactive && vp->v_usecount != 0) 278 vprint("nfs_reclaim: pushing active", vp); 279 280 LIST_REMOVE(np, n_hash); 281 282 /* 283 * For nqnfs, take it off the timer queue as required. 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