| 1 | /* $NetBSD: nfs_node.c,v 1.119 2016/08/20 12:37:09 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 1.119 2016/08/20 12:37:09 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 | /* |
| 231 | * Free up any directory cookie structures and |
| 232 | * large file handle structures that might be associated with |
| 233 | * this nfs node. |
| 234 | */ |
| 235 | if (vp->v_type == VDIR && np->n_dircache != NULL) { |
| 236 | nfs_invaldircache(vp, NFS_INVALDIRCACHE_FORCE); |
| 237 | hashdone(np->n_dircache, HASH_LIST, nfsdirhashmask); |
| 238 | } |
| 239 | KASSERT(np->n_dirgens == NULL); |
| 240 | |
| 241 | if (np->n_fhsize > NFS_SMALLFH) |
| 242 | kmem_free(np->n_fhp, np->n_fhsize); |
| 243 | |
| 244 | pool_put(&nfs_vattr_pool, np->n_vattr); |
| 245 | if (np->n_rcred) |
| 246 | kauth_cred_free(np->n_rcred); |
| 247 | |
| 248 | if (np->n_wcred) |
| 249 | kauth_cred_free(np->n_wcred); |
| 250 | |
| 251 | if (vp->v_type == VREG) { |
| 252 | mutex_destroy(&np->n_commitlock); |
| 253 | } |
| 254 | genfs_node_destroy(vp); |
| 255 | pool_put(&nfs_node_pool, np); |
| 256 | vp->v_data = NULL; |
| 257 | return (0); |
| 258 | } |
| 259 | |
| 260 | void |
| 261 | nfs_gop_size(struct vnode *vp, off_t size, off_t *eobp, int flags) |
| 262 | { |
| 263 | |
| 264 | *eobp = MAX(size, vp->v_size); |
| 265 | } |
| 266 | |
| 267 | int |
| 268 | nfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags, |
| 269 | kauth_cred_t cred) |
| 270 | { |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | int |
| 276 | nfs_gop_write(struct vnode *vp, struct vm_page **pgs, int npages, int flags) |
| 277 | { |
| 278 | int i; |
| 279 | |
| 280 | mutex_enter(vp->v_interlock); |
| 281 | for (i = 0; i < npages; i++) { |
| 282 | pmap_page_protect(pgs[i], VM_PROT_READ); |
| 283 | } |
| 284 | mutex_exit(vp->v_interlock); |
| 285 | |
| 286 | return genfs_gop_write(vp, pgs, npages, flags); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * Remove a silly file that was rename'd earlier |
| 291 | */ |
| 292 | static void |
| 293 | nfs_sillyworker(struct work *work, void *arg) |
| 294 | { |
| 295 | struct sillyrename *sp; |
| 296 | int error; |
| 297 | |
| 298 | sp = (struct sillyrename *)work; |
| 299 | error = vn_lock(sp->s_dvp, LK_EXCLUSIVE); |
| 300 | if (error || sp->s_dvp->v_data == NULL) { |
| 301 | /* XXX should recover */ |
| 302 | printf("%s: vp=%p error=%d\n" , __func__, sp->s_dvp, error); |
| 303 | if (error == 0) { |
| 304 | vput(sp->s_dvp); |
| 305 | } else { |
| 306 | vrele(sp->s_dvp); |
| 307 | } |
| 308 | } else { |
| 309 | nfs_removeit(sp); |
| 310 | vput(sp->s_dvp); |
| 311 | } |
| 312 | kauth_cred_free(sp->s_cred); |
| 313 | kmem_free(sp, sizeof(*sp)); |
| 314 | } |
| 315 | |