1 /* $NetBSD: nfs_node.c,v 1.122 2017/05/26 14:34:20 riastradh 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 1.122 2017/05/26 14:34:20 riastradh 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 static void nfs_gop_size(struct vnode *, off_t, off_t *, int); 68 static int nfs_gop_alloc(struct vnode *, off_t, off_t, int, kauth_cred_t); 69 static int nfs_gop_write(struct vnode *, struct vm_page **, int, int); 70 static void nfs_sillyworker(struct work *, void *); 71 72 static const struct genfs_ops nfs_genfsops = { 73 .gop_size = nfs_gop_size, 74 .gop_alloc = nfs_gop_alloc, 75 .gop_write = nfs_gop_write, 76 }; 77 78 /* 79 * Reinitialize inode hash table. 80 */ 81 void 82 nfs_node_init(void) 83 { 84 85 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 86 &pool_allocator_nointr, IPL_NONE); 87 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 88 &pool_allocator_nointr, IPL_NONE); 89 if (workqueue_create(&nfs_sillyworkq, "nfssilly", nfs_sillyworker, 90 NULL, PRI_NONE, IPL_NONE, 0) != 0) { 91 panic("nfs_node_init"); 92 } 93 } 94 95 /* 96 * Free resources previously allocated in nfs_node_reinit(). 97 */ 98 void 99 nfs_node_done(void) 100 { 101 102 pool_destroy(&nfs_node_pool); 103 pool_destroy(&nfs_vattr_pool); 104 workqueue_destroy(nfs_sillyworkq); 105 } 106 107 /* 108 * Initialize this vnode / nfs node pair. 109 * Caller assures no other thread will try to load this node. 110 */ 111 int 112 nfs_loadvnode(struct mount *mp, struct vnode *vp, 113 const void *key, size_t key_len, const void **new_key) 114 { 115 int fhsize = key_len; 116 const nfsfh_t *fhp = key; 117 struct nfsnode *np; 118 119 /* Aloocate and initialize the nfsnode. */ 120 np = pool_get(&nfs_node_pool, PR_WAITOK); 121 memset(np, 0, sizeof *np); 122 if (fhsize > NFS_SMALLFH) { 123 np->n_fhp = kmem_alloc(fhsize, KM_SLEEP); 124 } else 125 np->n_fhp = &np->n_fh; 126 vp->v_tag = VT_NFS; 127 vp->v_type = VNON; 128 vp->v_op = nfsv2_vnodeop_p; 129 vp->v_data = np; 130 memcpy(np->n_fhp, fhp, fhsize); 131 np->n_fhsize = fhsize; 132 np->n_accstamp = -1; 133 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 134 np->n_vnode = vp; 135 136 /* Initialize genfs node. */ 137 genfs_node_init(vp, &nfs_genfsops); 138 /* 139 * Initalize read/write creds to useful values. VOP_OPEN will 140 * overwrite these. 141 */ 142 np->n_rcred = curlwp->l_cred; 143 kauth_cred_hold(np->n_rcred); 144 np->n_wcred = curlwp->l_cred; 145 kauth_cred_hold(np->n_wcred); 146 NFS_INVALIDATE_ATTRCACHE(np); 147 uvm_vnp_setsize(vp, 0); 148 *new_key = np->n_fhp; 149 return 0; 150 } 151 152 /* 153 * Look up a vnode/nfsnode by file handle. 154 * Callers must check for mount points!! 155 * In all cases, a pointer to a 156 * nfsnode structure is returned. 157 */ 158 int 159 nfs_nget1(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, 160 int lkflags) 161 { 162 int error; 163 struct vnode *vp; 164 165 error = vcache_get(mntp, fhp, fhsize, &vp); 166 if (error) 167 return error; 168 error = vn_lock(vp, LK_EXCLUSIVE | lkflags); 169 if (error) { 170 vrele(vp); 171 return error; 172 } 173 *npp = VTONFS(vp); 174 return 0; 175 } 176 177 int 178 nfs_inactive(void *v) 179 { 180 struct vop_inactive_v2_args /* { 181 struct vnode *a_vp; 182 bool *a_recycle; 183 } */ *ap = v; 184 struct nfsnode *np; 185 struct sillyrename *sp; 186 struct vnode *vp = ap->a_vp; 187 188 np = VTONFS(vp); 189 if (vp->v_type != VDIR) { 190 sp = np->n_sillyrename; 191 np->n_sillyrename = (struct sillyrename *)0; 192 } else 193 sp = NULL; 194 if (sp != NULL) 195 nfs_vinvalbuf(vp, 0, sp->s_cred, curlwp, 1); 196 *ap->a_recycle = (np->n_flag & NREMOVED) != 0; 197 np->n_flag &= 198 (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NEOFVALID | NTRUNCDELAYED); 199 200 if (vp->v_type == VDIR && np->n_dircache) 201 nfs_invaldircache(vp, 202 NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF); 203 204 if (sp != NULL) { 205 workqueue_enqueue(nfs_sillyworkq, &sp->s_work, NULL); 206 } 207 208 return (0); 209 } 210 211 /* 212 * Reclaim an nfsnode so that it can be used for other purposes. 213 */ 214 int 215 nfs_reclaim(void *v) 216 { 217 struct vop_reclaim_v2_args /* { 218 struct vnode *a_vp; 219 } */ *ap = v; 220 struct vnode *vp = ap->a_vp; 221 struct nfsnode *np = VTONFS(vp); 222 223 VOP_UNLOCK(vp); 224 225 /* 226 * Free up any directory cookie structures and 227 * large file handle structures that might be associated with 228 * this nfs node. 229 */ 230 if (vp->v_type == VDIR && np->n_dircache != NULL) { 231 nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE); 232 hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask); 233 } 234 KASSERT(np->n_dirgens == NULL); 235 236 if (np->n_fhsize > NFS_SMALLFH) 237 kmem_free(np->n_fhp, np->n_fhsize); 238 239 pool_put(&nfs_vattr_pool, np->n_vattr); 240 if (np->n_rcred) 241 kauth_cred_free(np->n_rcred); 242 243 if (np->n_wcred) 244 kauth_cred_free(np->n_wcred); 245 246 if (vp->v_type == VREG) { 247 mutex_destroy(&np->n_commitlock); 248 } 249 genfs_node_destroy(vp); 250 pool_put(&nfs_node_pool, np); 251 vp->v_data = NULL; 252 return (0); 253 } 254 255 void 256 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) 257 { 258 259 *eobp = MAX(size, vp->v_size); 260 } 261 262 int 263 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 264 kauth_cred_t cred) 265 { 266 267 return 0; 268 } 269 270 int 271 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) 272 { 273 int i; 274 275 mutex_enter(vp->v_interlock); 276 for (i = 0; i < npages; i++) { 277 pmap_page_protect(pgs[i], VM_PROT_READ); 278 } 279 mutex_exit(vp->v_interlock); 280 281 return genfs_gop_write(vp, pgs, npages, flags); 282 } 283 284 /* 285 * Remove a silly file that was rename'd earlier 286 */ 287 static void 288 nfs_sillyworker(struct work *work, void *arg) 289 { 290 struct sillyrename *sp; 291 int error; 292 293 sp = (struct sillyrename *)work; 294 error = vn_lock(sp->s_dvp, LK_EXCLUSIVE); 295 if (error || sp->s_dvp->v_data == NULL) { 296 /* XXX should recover */ 297 printf("%s: vp=%p error=%d\n", __func__, sp->s_dvp, error); 298 if (error == 0) { 299 vput(sp->s_dvp); 300 } else { 301 vrele(sp->s_dvp); 302 } 303 } else { 304 nfs_removeit(sp); 305 vput(sp->s_dvp); 306 } 307 kauth_cred_free(sp->s_cred); 308 kmem_free(sp, sizeof(*sp)); 309 } 310