1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from nfs_node.c 8.6 (Berkeley) 5/22/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "opt_kdtrace.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/fcntl.h> 43 #include <sys/lock.h> 44 #include <sys/malloc.h> 45 #include <sys/mount.h> 46 #include <sys/namei.h> 47 #include <sys/proc.h> 48 #include <sys/socket.h> 49 #include <sys/sysctl.h> 50 #include <sys/taskqueue.h> 51 #include <sys/vnode.h> 52 53 #include <vm/uma.h> 54 55 #include <fs/nfs/nfsport.h> 56 #include <fs/nfsclient/nfsnode.h> 57 #include <fs/nfsclient/nfsmount.h> 58 #include <fs/nfsclient/nfs.h> 59 #include <fs/nfsclient/nfs_kdtrace.h> 60 61 #include <nfs/nfs_lock.h> 62 63 extern struct vop_vector newnfs_vnodeops; 64 extern struct buf_ops buf_ops_newnfs; 65 MALLOC_DECLARE(M_NEWNFSREQ); 66 67 uma_zone_t newnfsnode_zone; 68 69 static void nfs_freesillyrename(void *arg, __unused int pending); 70 71 void 72 ncl_nhinit(void) 73 { 74 75 newnfsnode_zone = uma_zcreate("NCLNODE", sizeof(struct nfsnode), NULL, 76 NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 77 } 78 79 void 80 ncl_nhuninit(void) 81 { 82 uma_zdestroy(newnfsnode_zone); 83 } 84 85 /* 86 * ONLY USED FOR THE ROOT DIRECTORY. nfscl_nget() does the rest. If this 87 * function is going to be used to get Regular Files, code must be added 88 * to fill in the "struct nfsv4node". 89 * Look up a vnode/nfsnode by file handle. 90 * Callers must check for mount points!! 91 * In all cases, a pointer to a 92 * nfsnode structure is returned. 93 */ 94 int 95 ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp, 96 int lkflags) 97 { 98 struct thread *td = curthread; /* XXX */ 99 struct nfsnode *np; 100 struct vnode *vp; 101 struct vnode *nvp; 102 int error; 103 u_int hash; 104 struct nfsmount *nmp; 105 struct nfsfh *nfhp; 106 107 nmp = VFSTONFS(mntp); 108 *npp = NULL; 109 110 hash = fnv_32_buf(fhp, fhsize, FNV1_32_INIT); 111 112 MALLOC(nfhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize, 113 M_NFSFH, M_WAITOK); 114 bcopy(fhp, &nfhp->nfh_fh[0], fhsize); 115 nfhp->nfh_len = fhsize; 116 error = vfs_hash_get(mntp, hash, lkflags, 117 td, &nvp, newnfs_vncmpf, nfhp); 118 FREE(nfhp, M_NFSFH); 119 if (error) 120 return (error); 121 if (nvp != NULL) { 122 *npp = VTONFS(nvp); 123 return (0); 124 } 125 126 /* 127 * Allocate before getnewvnode since doing so afterward 128 * might cause a bogus v_data pointer to get dereferenced 129 * elsewhere if zalloc should block. 130 */ 131 np = uma_zalloc(newnfsnode_zone, M_WAITOK | M_ZERO); 132 133 error = getnewvnode("newnfs", mntp, &newnfs_vnodeops, &nvp); 134 if (error) { 135 uma_zfree(newnfsnode_zone, np); 136 return (error); 137 } 138 vp = nvp; 139 KASSERT(vp->v_bufobj.bo_bsize != 0, ("ncl_nget: bo_bsize == 0")); 140 vp->v_bufobj.bo_ops = &buf_ops_newnfs; 141 vp->v_data = np; 142 np->n_vnode = vp; 143 /* 144 * Initialize the mutex even if the vnode is going to be a loser. 145 * This simplifies the logic in reclaim, which can then unconditionally 146 * destroy the mutex (in the case of the loser, or if hash_insert 147 * happened to return an error no special casing is needed). 148 */ 149 mtx_init(&np->n_mtx, "NEWNFSnode lock", NULL, MTX_DEF | MTX_DUPOK); 150 /* 151 * NFS supports recursive and shared locking. 152 */ 153 lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL); 154 VN_LOCK_AREC(vp); 155 VN_LOCK_ASHARE(vp); 156 /* 157 * Are we getting the root? If so, make sure the vnode flags 158 * are correct 159 */ 160 if ((fhsize == nmp->nm_fhsize) && 161 !bcmp(fhp, nmp->nm_fh, fhsize)) { 162 if (vp->v_type == VNON) 163 vp->v_type = VDIR; 164 vp->v_vflag |= VV_ROOT; 165 } 166 167 MALLOC(np->n_fhp, struct nfsfh *, sizeof (struct nfsfh) + fhsize, 168 M_NFSFH, M_WAITOK); 169 bcopy(fhp, np->n_fhp->nfh_fh, fhsize); 170 np->n_fhp->nfh_len = fhsize; 171 error = insmntque(vp, mntp); 172 if (error != 0) { 173 *npp = NULL; 174 FREE((caddr_t)np->n_fhp, M_NFSFH); 175 mtx_destroy(&np->n_mtx); 176 uma_zfree(newnfsnode_zone, np); 177 return (error); 178 } 179 error = vfs_hash_insert(vp, hash, lkflags, 180 td, &nvp, newnfs_vncmpf, np->n_fhp); 181 if (error) 182 return (error); 183 if (nvp != NULL) { 184 *npp = VTONFS(nvp); 185 /* vfs_hash_insert() vput()'s the losing vnode */ 186 return (0); 187 } 188 *npp = np; 189 190 return (0); 191 } 192 193 /* 194 * Do the vrele(sp->s_dvp) as a separate task in order to avoid a 195 * deadlock because of a LOR when vrele() locks the directory vnode. 196 */ 197 static void 198 nfs_freesillyrename(void *arg, __unused int pending) 199 { 200 struct sillyrename *sp; 201 202 sp = arg; 203 vrele(sp->s_dvp); 204 free(sp, M_NEWNFSREQ); 205 } 206 207 int 208 ncl_inactive(struct vop_inactive_args *ap) 209 { 210 struct nfsnode *np; 211 struct sillyrename *sp; 212 struct vnode *vp = ap->a_vp; 213 boolean_t retv; 214 215 np = VTONFS(vp); 216 217 if (NFS_ISV4(vp) && vp->v_type == VREG) { 218 /* 219 * Since mmap()'d files do I/O after VOP_CLOSE(), the NFSv4 220 * Close operations are delayed until now. Any dirty 221 * buffers/pages must be flushed before the close, so that the 222 * stateid is available for the writes. 223 */ 224 if (vp->v_object != NULL) { 225 VM_OBJECT_LOCK(vp->v_object); 226 retv = vm_object_page_clean(vp->v_object, 0, 0, 227 OBJPC_SYNC); 228 VM_OBJECT_UNLOCK(vp->v_object); 229 } else 230 retv = TRUE; 231 if (retv == TRUE) { 232 (void)ncl_flush(vp, MNT_WAIT, NULL, ap->a_td, 1, 0); 233 (void)nfsrpc_close(vp, 1, ap->a_td); 234 } 235 } 236 237 mtx_lock(&np->n_mtx); 238 if (vp->v_type != VDIR) { 239 sp = np->n_sillyrename; 240 np->n_sillyrename = NULL; 241 } else 242 sp = NULL; 243 if (sp) { 244 mtx_unlock(&np->n_mtx); 245 (void) ncl_vinvalbuf(vp, 0, ap->a_td, 1); 246 /* 247 * Remove the silly file that was rename'd earlier 248 */ 249 ncl_removeit(sp, vp); 250 crfree(sp->s_cred); 251 TASK_INIT(&sp->s_task, 0, nfs_freesillyrename, sp); 252 taskqueue_enqueue(taskqueue_thread, &sp->s_task); 253 mtx_lock(&np->n_mtx); 254 } 255 np->n_flag &= NMODIFIED; 256 mtx_unlock(&np->n_mtx); 257 return (0); 258 } 259 260 /* 261 * Reclaim an nfsnode so that it can be used for other purposes. 262 */ 263 int 264 ncl_reclaim(struct vop_reclaim_args *ap) 265 { 266 struct vnode *vp = ap->a_vp; 267 struct nfsnode *np = VTONFS(vp); 268 struct nfsdmap *dp, *dp2; 269 270 /* 271 * If the NLM is running, give it a chance to abort pending 272 * locks. 273 */ 274 if (nfs_reclaim_p != NULL) 275 nfs_reclaim_p(ap); 276 277 /* 278 * Destroy the vm object and flush associated pages. 279 */ 280 vnode_destroy_vobject(vp); 281 282 if (NFS_ISV4(vp) && vp->v_type == VREG) 283 /* 284 * We can now safely close any remaining NFSv4 Opens for 285 * this file. Most opens will have already been closed by 286 * ncl_inactive(), but there are cases where it is not 287 * called, so we need to do it again here. 288 */ 289 (void) nfsrpc_close(vp, 1, ap->a_td); 290 291 vfs_hash_remove(vp); 292 293 /* 294 * Call nfscl_reclaimnode() to save attributes in the delegation, 295 * as required. 296 */ 297 if (vp->v_type == VREG) 298 nfscl_reclaimnode(vp); 299 300 /* 301 * Free up any directory cookie structures and 302 * large file handle structures that might be associated with 303 * this nfs node. 304 */ 305 if (vp->v_type == VDIR) { 306 dp = LIST_FIRST(&np->n_cookies); 307 while (dp) { 308 dp2 = dp; 309 dp = LIST_NEXT(dp, ndm_list); 310 FREE((caddr_t)dp2, M_NFSDIROFF); 311 } 312 } 313 if (np->n_writecred != NULL) 314 crfree(np->n_writecred); 315 FREE((caddr_t)np->n_fhp, M_NFSFH); 316 if (np->n_v4 != NULL) 317 FREE((caddr_t)np->n_v4, M_NFSV4NODE); 318 mtx_destroy(&np->n_mtx); 319 uma_zfree(newnfsnode_zone, vp->v_data); 320 vp->v_data = NULL; 321 return (0); 322 } 323 324 /* 325 * Invalidate both the access and attribute caches for this vnode. 326 */ 327 void 328 ncl_invalcaches(struct vnode *vp) 329 { 330 struct nfsnode *np = VTONFS(vp); 331 int i; 332 333 mtx_lock(&np->n_mtx); 334 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) 335 np->n_accesscache[i].stamp = 0; 336 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); 337 np->n_attrstamp = 0; 338 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 339 mtx_unlock(&np->n_mtx); 340 } 341 342