1 /* $NetBSD: nfs_node.c,v 1.118 2014/05/30 08:47:45 hannken 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 1.118 2014/05/30 08:47:45 hannken Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_nfs.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/mount.h> 48 #include <sys/namei.h> 49 #include <sys/vnode.h> 50 #include <sys/kernel.h> 51 #include <sys/pool.h> 52 #include <sys/lock.h> 53 #include <sys/hash.h> 54 #include <sys/kauth.h> 55 56 #include <nfs/rpcv2.h> 57 #include <nfs/nfsproto.h> 58 #include <nfs/nfs.h> 59 #include <nfs/nfsnode.h> 60 #include <nfs/nfsmount.h> 61 #include <nfs/nfs_var.h> 62 63 struct pool nfs_node_pool; 64 struct pool nfs_vattr_pool; 65 static struct workqueue *nfs_sillyworkq; 66 67 extern int prtactive; 68 69 static void nfs_gop_size(struct vnode *, off_t, off_t *, int); 70 static int nfs_gop_alloc(struct vnode *, off_t, off_t, int, kauth_cred_t); 71 static int nfs_gop_write(struct vnode *, struct vm_page **, int, int); 72 static void nfs_sillyworker(struct work *, void *); 73 74 static const struct genfs_ops nfs_genfsops = { 75 .gop_size = nfs_gop_size, 76 .gop_alloc = nfs_gop_alloc, 77 .gop_write = nfs_gop_write, 78 }; 79 80 /* 81 * Reinitialize inode hash table. 82 */ 83 void 84 nfs_node_init(void) 85 { 86 87 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 88 &pool_allocator_nointr, IPL_NONE); 89 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 90 &pool_allocator_nointr, IPL_NONE); 91 if (workqueue_create(&nfs_sillyworkq, "nfssilly", nfs_sillyworker, 92 NULL, PRI_NONE, IPL_NONE, 0) != 0) { 93 panic("nfs_node_init"); 94 } 95 } 96 97 /* 98 * Free resources previously allocated in nfs_node_reinit(). 99 */ 100 void 101 nfs_node_done(void) 102 { 103 104 pool_destroy(&nfs_node_pool); 105 pool_destroy(&nfs_vattr_pool); 106 workqueue_destroy(nfs_sillyworkq); 107 } 108 109 /* 110 * Initialize this vnode / nfs node pair. 111 * Caller assures no other thread will try to load this node. 112 */ 113 int 114 nfs_loadvnode(struct mount *mp, struct vnode *vp, 115 const void *key, size_t key_len, const void **new_key) 116 { 117 int fhsize = key_len; 118 const nfsfh_t *fhp = key; 119 struct nfsnode *np; 120 121 /* Aloocate and initialize the nfsnode. */ 122 np = pool_get(&nfs_node_pool, PR_WAITOK); 123 memset(np, 0, sizeof *np); 124 if (fhsize > NFS_SMALLFH) { 125 np->n_fhp = kmem_alloc(fhsize, KM_SLEEP); 126 } else 127 np->n_fhp = &np->n_fh; 128 vp->v_tag = VT_NFS; 129 vp->v_type = VNON; 130 vp->v_op = nfsv2_vnodeop_p; 131 vp->v_data = np; 132 memcpy(np->n_fhp, fhp, fhsize); 133 np->n_fhsize = fhsize; 134 np->n_accstamp = -1; 135 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 136 np->n_vnode = vp; 137 138 /* Initialize genfs node. */ 139 genfs_node_init(vp, &nfs_genfsops); 140 /* 141 * Initalize read/write creds to useful values. VOP_OPEN will 142 * overwrite these. 143 */ 144 np->n_rcred = curlwp->l_cred; 145 kauth_cred_hold(np->n_rcred); 146 np->n_wcred = curlwp->l_cred; 147 kauth_cred_hold(np->n_wcred); 148 NFS_INVALIDATE_ATTRCACHE(np); 149 uvm_vnp_setsize(vp, 0); 150 *new_key = np->n_fhp; 151 return 0; 152 } 153 154 /* 155 * Look up a vnode/nfsnode by file handle. 156 * Callers must check for mount points!! 157 * In all cases, a pointer to a 158 * nfsnode structure is returned. 159 */ 160 int 161 nfs_nget1(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, 162 int lkflags) 163 { 164 int error; 165 struct vnode *vp; 166 167 error = vcache_get(mntp, fhp, fhsize, &vp); 168 if (error) 169 return error; 170 error = vn_lock(vp, LK_EXCLUSIVE | lkflags); 171 if (error) { 172 vrele(vp); 173 return error; 174 } 175 *npp = VTONFS(vp); 176 return 0; 177 } 178 179 int 180 nfs_inactive(void *v) 181 { 182 struct vop_inactive_args /* { 183 struct vnode *a_vp; 184 bool *a_recycle; 185 } */ *ap = v; 186 struct nfsnode *np; 187 struct sillyrename *sp; 188 struct vnode *vp = ap->a_vp; 189 190 np = VTONFS(vp); 191 if (vp->v_type != VDIR) { 192 sp = np->n_sillyrename; 193 np->n_sillyrename = (struct sillyrename *)0; 194 } else 195 sp = NULL; 196 if (sp != NULL) 197 nfs_vinvalbuf(vp, 0, sp->s_cred, curlwp, 1); 198 *ap->a_recycle = (np->n_flag & NREMOVED) != 0; 199 np->n_flag &= 200 (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NEOFVALID | NTRUNCDELAYED); 201 202 if (vp->v_type == VDIR && np->n_dircache) 203 nfs_invaldircache(vp, 204 NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF); 205 206 VOP_UNLOCK(vp); 207 208 if (sp != NULL) { 209 workqueue_enqueue(nfs_sillyworkq, &sp->s_work, NULL); 210 } 211 212 return (0); 213 } 214 215 /* 216 * Reclaim an nfsnode so that it can be used for other purposes. 217 */ 218 int 219 nfs_reclaim(void *v) 220 { 221 struct vop_reclaim_args /* { 222 struct vnode *a_vp; 223 } */ *ap = v; 224 struct vnode *vp = ap->a_vp; 225 struct nfsnode *np = VTONFS(vp); 226 227 if (prtactive && vp->v_usecount > 1) 228 vprint("nfs_reclaim: pushing active", vp); 229 230 vcache_remove(vp->v_mount, np->n_fhp, np->n_fhsize); 231 232 /* 233 * Free up any directory cookie structures and 234 * large file handle structures that might be associated with 235 * this nfs node. 236 */ 237 if (vp->v_type == VDIR && np->n_dircache != NULL) { 238 nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE); 239 hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask); 240 } 241 KASSERT(np->n_dirgens == NULL); 242 243 if (np->n_fhsize > NFS_SMALLFH) 244 kmem_free(np->n_fhp, np->n_fhsize); 245 246 pool_put(&nfs_vattr_pool, np->n_vattr); 247 if (np->n_rcred) 248 kauth_cred_free(np->n_rcred); 249 250 if (np->n_wcred) 251 kauth_cred_free(np->n_wcred); 252 253 if (vp->v_type == VREG) { 254 mutex_destroy(&np->n_commitlock); 255 } 256 genfs_node_destroy(vp); 257 pool_put(&nfs_node_pool, np); 258 vp->v_data = NULL; 259 return (0); 260 } 261 262 void 263 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) 264 { 265 266 *eobp = MAX(size, vp->v_size); 267 } 268 269 int 270 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 271 kauth_cred_t cred) 272 { 273 274 return 0; 275 } 276 277 int 278 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) 279 { 280 int i; 281 282 mutex_enter(vp->v_interlock); 283 for (i = 0; i < npages; i++) { 284 pmap_page_protect(pgs[i], VM_PROT_READ); 285 } 286 mutex_exit(vp->v_interlock); 287 288 return genfs_gop_write(vp, pgs, npages, flags); 289 } 290 291 /* 292 * Remove a silly file that was rename'd earlier 293 */ 294 static void 295 nfs_sillyworker(struct work *work, void *arg) 296 { 297 struct sillyrename *sp; 298 int error; 299 300 sp = (struct sillyrename *)work; 301 error = vn_lock(sp->s_dvp, LK_EXCLUSIVE); 302 if (error || sp->s_dvp->v_data == NULL) { 303 /* XXX should recover */ 304 printf("%s: vp=%p error=%d\n", __func__, sp->s_dvp, error); 305 if (error == 0) { 306 vput(sp->s_dvp); 307 } else { 308 vrele(sp->s_dvp); 309 } 310 } else { 311 nfs_removeit(sp); 312 vput(sp->s_dvp); 313 } 314 kauth_cred_free(sp->s_cred); 315 kmem_free(sp, sizeof(*sp)); 316 } 317