1 /* $NetBSD: nfs_node.c,v 1.124 2019/10/18 04:09:02 msaitoh 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 1.124 2019/10/18 04:09:02 msaitoh 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 .gop_putrange = genfs_gop_putrange, 77 }; 78 79 /* 80 * Reinitialize inode hash table. 81 */ 82 void 83 nfs_node_init(void) 84 { 85 86 pool_init(&nfs_node_pool, sizeof(struct nfsnode), 0, 0, 0, "nfsnodepl", 87 &pool_allocator_nointr, IPL_NONE); 88 pool_init(&nfs_vattr_pool, sizeof(struct vattr), 0, 0, 0, "nfsvapl", 89 &pool_allocator_nointr, IPL_NONE); 90 if (workqueue_create(&nfs_sillyworkq, "nfssilly", nfs_sillyworker, 91 NULL, PRI_NONE, IPL_NONE, 0) != 0) { 92 panic("nfs_node_init"); 93 } 94 } 95 96 /* 97 * Free resources previously allocated in nfs_node_reinit(). 98 */ 99 void 100 nfs_node_done(void) 101 { 102 103 pool_destroy(&nfs_node_pool); 104 pool_destroy(&nfs_vattr_pool); 105 workqueue_destroy(nfs_sillyworkq); 106 } 107 108 /* 109 * Initialize this vnode / nfs node pair. 110 * Caller assures no other thread will try to load this node. 111 */ 112 int 113 nfs_loadvnode(struct mount *mp, struct vnode *vp, 114 const void *key, size_t key_len, const void **new_key) 115 { 116 int fhsize = key_len; 117 const nfsfh_t *fhp = key; 118 struct nfsnode *np; 119 120 /* Aloocate and initialize the nfsnode. */ 121 np = pool_get(&nfs_node_pool, PR_WAITOK); 122 memset(np, 0, sizeof *np); 123 if (fhsize > NFS_SMALLFH) { 124 np->n_fhp = kmem_alloc(fhsize, KM_SLEEP); 125 } else 126 np->n_fhp = &np->n_fh; 127 vp->v_tag = VT_NFS; 128 vp->v_type = VNON; 129 vp->v_op = nfsv2_vnodeop_p; 130 vp->v_data = np; 131 memcpy(np->n_fhp, fhp, fhsize); 132 np->n_fhsize = fhsize; 133 np->n_accstamp = -1; 134 np->n_vattr = pool_get(&nfs_vattr_pool, PR_WAITOK); 135 np->n_vnode = vp; 136 137 /* Initialize genfs node. */ 138 genfs_node_init(vp, &nfs_genfsops); 139 /* 140 * Initialize read/write creds to useful values. VOP_OPEN will 141 * overwrite these. 142 */ 143 np->n_rcred = curlwp->l_cred; 144 kauth_cred_hold(np->n_rcred); 145 np->n_wcred = curlwp->l_cred; 146 kauth_cred_hold(np->n_wcred); 147 NFS_INVALIDATE_ATTRCACHE(np); 148 uvm_vnp_setsize(vp, 0); 149 *new_key = np->n_fhp; 150 return 0; 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_nget1(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, 161 int lkflags) 162 { 163 int error; 164 struct vnode *vp; 165 166 error = vcache_get(mntp, fhp, fhsize, &vp); 167 if (error) 168 return error; 169 error = vn_lock(vp, LK_EXCLUSIVE | lkflags); 170 if (error) { 171 vrele(vp); 172 return error; 173 } 174 *npp = VTONFS(vp); 175 return 0; 176 } 177 178 int 179 nfs_inactive(void *v) 180 { 181 struct vop_inactive_v2_args /* { 182 struct vnode *a_vp; 183 bool *a_recycle; 184 } */ *ap = v; 185 struct nfsnode *np; 186 struct sillyrename *sp; 187 struct vnode *vp = ap->a_vp; 188 189 np = VTONFS(vp); 190 if (vp->v_type != VDIR) { 191 sp = np->n_sillyrename; 192 np->n_sillyrename = (struct sillyrename *)0; 193 } else 194 sp = NULL; 195 if (sp != NULL) 196 nfs_vinvalbuf(vp, 0, sp->s_cred, curlwp, 1); 197 *ap->a_recycle = (np->n_flag & NREMOVED) != 0; 198 np->n_flag &= 199 (NMODIFIED | NFLUSHINPROG | NFLUSHWANT | NEOFVALID | NTRUNCDELAYED); 200 201 if (vp->v_type == VDIR && np->n_dircache) 202 nfs_invaldircache(vp, 203 NFS_INVALDIRCACHE_FORCE | NFS_INVALDIRCACHE_KEEPEOF); 204 205 if (sp != NULL) { 206 workqueue_enqueue(nfs_sillyworkq, &sp->s_work, NULL); 207 } 208 209 return (0); 210 } 211 212 /* 213 * Reclaim an nfsnode so that it can be used for other purposes. 214 */ 215 int 216 nfs_reclaim(void *v) 217 { 218 struct vop_reclaim_v2_args /* { 219 struct vnode *a_vp; 220 } */ *ap = v; 221 struct vnode *vp = ap->a_vp; 222 struct nfsnode *np = VTONFS(vp); 223 224 VOP_UNLOCK(vp); 225 226 /* 227 * Free up any directory cookie structures and 228 * large file handle structures that might be associated with 229 * this nfs node. 230 */ 231 if (vp->v_type == VDIR && np->n_dircache != NULL) { 232 nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE); 233 hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask); 234 } 235 KASSERT(np->n_dirgens == NULL); 236 237 if (np->n_fhsize > NFS_SMALLFH) 238 kmem_free(np->n_fhp, np->n_fhsize); 239 240 pool_put(&nfs_vattr_pool, np->n_vattr); 241 if (np->n_rcred) 242 kauth_cred_free(np->n_rcred); 243 244 if (np->n_wcred) 245 kauth_cred_free(np->n_wcred); 246 247 if (vp->v_type == VREG) { 248 mutex_destroy(&np->n_commitlock); 249 } 250 genfs_node_destroy(vp); 251 pool_put(&nfs_node_pool, np); 252 vp->v_data = NULL; 253 return (0); 254 } 255 256 void 257 nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) 258 { 259 260 *eobp = MAX(size, vp->v_size); 261 } 262 263 int 264 nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, 265 kauth_cred_t cred) 266 { 267 268 return 0; 269 } 270 271 int 272 nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) 273 { 274 int i; 275 276 mutex_enter(vp->v_interlock); 277 for (i = 0; i < npages; i++) { 278 pmap_page_protect(pgs[i], VM_PROT_READ); 279 } 280 mutex_exit(vp->v_interlock); 281 282 return genfs_gop_write(vp, pgs, npages, flags); 283 } 284 285 /* 286 * Remove a silly file that was rename'd earlier 287 */ 288 static void 289 nfs_sillyworker(struct work *work, void *arg) 290 { 291 struct sillyrename *sp; 292 int error; 293 294 sp = (struct sillyrename *)work; 295 error = vn_lock(sp->s_dvp, LK_EXCLUSIVE); 296 if (error || sp->s_dvp->v_data == NULL) { 297 /* XXX should recover */ 298 printf("%s: vp=%p error=%d\n", __func__, sp->s_dvp, error); 299 if (error == 0) { 300 vput(sp->s_dvp); 301 } else { 302 vrele(sp->s_dvp); 303 } 304 } else { 305 nfs_removeit(sp); 306 vput(sp->s_dvp); 307 } 308 kauth_cred_free(sp->s_cred); 309 kmem_free(sp, sizeof(*sp)); 310 } 311