1 /* $NetBSD: nfs_vnops.c,v 1.309 2016/01/19 10:56:59 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_vnops.c 8.19 (Berkeley) 7/31/95 35 */ 36 37 /* 38 * vnode op calls for Sun NFS version 2 and 3 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_vnops.c,v 1.309 2016/01/19 10:56:59 hannken Exp $"); 43 44 #ifdef _KERNEL_OPT 45 #include "opt_nfs.h" 46 #include "opt_uvmhist.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/proc.h> 51 #include <sys/kernel.h> 52 #include <sys/systm.h> 53 #include <sys/resourcevar.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/condvar.h> 57 #include <sys/disk.h> 58 #include <sys/malloc.h> 59 #include <sys/kmem.h> 60 #include <sys/mbuf.h> 61 #include <sys/mutex.h> 62 #include <sys/namei.h> 63 #include <sys/vnode.h> 64 #include <sys/dirent.h> 65 #include <sys/fcntl.h> 66 #include <sys/hash.h> 67 #include <sys/lockf.h> 68 #include <sys/stat.h> 69 #include <sys/unistd.h> 70 #include <sys/kauth.h> 71 #include <sys/cprng.h> 72 73 #include <uvm/uvm_extern.h> 74 #include <uvm/uvm.h> 75 76 #include <miscfs/fifofs/fifo.h> 77 #include <miscfs/genfs/genfs.h> 78 #include <miscfs/genfs/genfs_node.h> 79 #include <miscfs/specfs/specdev.h> 80 81 #include <nfs/rpcv2.h> 82 #include <nfs/nfsproto.h> 83 #include <nfs/nfs.h> 84 #include <nfs/nfsnode.h> 85 #include <nfs/nfsmount.h> 86 #include <nfs/xdr_subs.h> 87 #include <nfs/nfsm_subs.h> 88 #include <nfs/nfs_var.h> 89 90 #include <net/if.h> 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 94 /* 95 * Global vfs data structures for nfs 96 */ 97 int (**nfsv2_vnodeop_p)(void *); 98 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 99 { &vop_default_desc, vn_default_error }, 100 { &vop_lookup_desc, nfs_lookup }, /* lookup */ 101 { &vop_create_desc, nfs_create }, /* create */ 102 { &vop_mknod_desc, nfs_mknod }, /* mknod */ 103 { &vop_open_desc, nfs_open }, /* open */ 104 { &vop_close_desc, nfs_close }, /* close */ 105 { &vop_access_desc, nfs_access }, /* access */ 106 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 107 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 108 { &vop_read_desc, nfs_read }, /* read */ 109 { &vop_write_desc, nfs_write }, /* write */ 110 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 111 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 112 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 113 { &vop_ioctl_desc, nfs_ioctl }, /* ioctl */ 114 { &vop_poll_desc, nfs_poll }, /* poll */ 115 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 116 { &vop_revoke_desc, nfs_revoke }, /* revoke */ 117 { &vop_mmap_desc, nfs_mmap }, /* mmap */ 118 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 119 { &vop_seek_desc, nfs_seek }, /* seek */ 120 { &vop_remove_desc, nfs_remove }, /* remove */ 121 { &vop_link_desc, nfs_link }, /* link */ 122 { &vop_rename_desc, nfs_rename }, /* rename */ 123 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 124 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 125 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 126 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 127 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 128 { &vop_abortop_desc, nfs_abortop }, /* abortop */ 129 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 130 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 131 { &vop_lock_desc, nfs_lock }, /* lock */ 132 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 133 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 134 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 135 { &vop_print_desc, nfs_print }, /* print */ 136 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 137 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 138 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 139 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 140 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 141 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 142 { NULL, NULL } 143 }; 144 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 145 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 146 147 /* 148 * Special device vnode ops 149 */ 150 int (**spec_nfsv2nodeop_p)(void *); 151 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 152 { &vop_default_desc, vn_default_error }, 153 { &vop_lookup_desc, spec_lookup }, /* lookup */ 154 { &vop_create_desc, spec_create }, /* create */ 155 { &vop_mknod_desc, spec_mknod }, /* mknod */ 156 { &vop_open_desc, spec_open }, /* open */ 157 { &vop_close_desc, nfsspec_close }, /* close */ 158 { &vop_access_desc, nfsspec_access }, /* access */ 159 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 160 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 161 { &vop_read_desc, nfsspec_read }, /* read */ 162 { &vop_write_desc, nfsspec_write }, /* write */ 163 { &vop_fallocate_desc, spec_fallocate }, /* fallocate */ 164 { &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */ 165 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 166 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 167 { &vop_poll_desc, spec_poll }, /* poll */ 168 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 169 { &vop_revoke_desc, spec_revoke }, /* revoke */ 170 { &vop_mmap_desc, spec_mmap }, /* mmap */ 171 { &vop_fsync_desc, spec_fsync }, /* fsync */ 172 { &vop_seek_desc, spec_seek }, /* seek */ 173 { &vop_remove_desc, spec_remove }, /* remove */ 174 { &vop_link_desc, spec_link }, /* link */ 175 { &vop_rename_desc, spec_rename }, /* rename */ 176 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 177 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 178 { &vop_symlink_desc, spec_symlink }, /* symlink */ 179 { &vop_readdir_desc, spec_readdir }, /* readdir */ 180 { &vop_readlink_desc, spec_readlink }, /* readlink */ 181 { &vop_abortop_desc, spec_abortop }, /* abortop */ 182 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 183 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 184 { &vop_lock_desc, nfs_lock }, /* lock */ 185 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 186 { &vop_bmap_desc, spec_bmap }, /* bmap */ 187 { &vop_strategy_desc, spec_strategy }, /* strategy */ 188 { &vop_print_desc, nfs_print }, /* print */ 189 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 190 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 191 { &vop_advlock_desc, spec_advlock }, /* advlock */ 192 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 193 { &vop_getpages_desc, spec_getpages }, /* getpages */ 194 { &vop_putpages_desc, spec_putpages }, /* putpages */ 195 { NULL, NULL } 196 }; 197 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 198 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 199 200 int (**fifo_nfsv2nodeop_p)(void *); 201 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 202 { &vop_default_desc, vn_default_error }, 203 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 204 { &vop_create_desc, vn_fifo_bypass }, /* create */ 205 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 206 { &vop_open_desc, vn_fifo_bypass }, /* open */ 207 { &vop_close_desc, nfsfifo_close }, /* close */ 208 { &vop_access_desc, nfsspec_access }, /* access */ 209 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 210 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 211 { &vop_read_desc, nfsfifo_read }, /* read */ 212 { &vop_write_desc, nfsfifo_write }, /* write */ 213 { &vop_fallocate_desc, vn_fifo_bypass }, /* fallocate */ 214 { &vop_fdiscard_desc, vn_fifo_bypass }, /* fdiscard */ 215 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 216 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 217 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 218 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 219 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 220 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 221 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 222 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 223 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 224 { &vop_link_desc, vn_fifo_bypass }, /* link */ 225 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 226 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 227 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 228 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 229 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 230 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 231 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 232 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 233 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 234 { &vop_lock_desc, nfs_lock }, /* lock */ 235 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 236 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 237 { &vop_strategy_desc, genfs_badop }, /* strategy */ 238 { &vop_print_desc, nfs_print }, /* print */ 239 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 240 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 241 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 242 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 243 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 244 { NULL, NULL } 245 }; 246 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 247 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 248 249 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 250 size_t, kauth_cred_t, struct lwp *); 251 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 252 253 /* 254 * Global variables 255 */ 256 extern u_int32_t nfs_true, nfs_false; 257 extern u_int32_t nfs_xdrneg1; 258 extern const nfstype nfsv3_type[9]; 259 260 int nfs_numasync = 0; 261 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 262 #define UIO_ADVANCE(uio, siz) \ 263 (void)((uio)->uio_resid -= (siz), \ 264 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 265 (uio)->uio_iov->iov_len -= (siz)) 266 267 static void nfs_cache_enter(struct vnode *, struct vnode *, 268 struct componentname *); 269 270 static void 271 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 272 struct componentname *cnp) 273 { 274 struct nfsnode *dnp = VTONFS(dvp); 275 276 if ((cnp->cn_flags & MAKEENTRY) == 0) { 277 return; 278 } 279 if (vp != NULL) { 280 struct nfsnode *np = VTONFS(vp); 281 282 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 283 } 284 285 if (!timespecisset(&dnp->n_nctime)) 286 dnp->n_nctime = dnp->n_vattr->va_mtime; 287 288 cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); 289 } 290 291 /* 292 * nfs null call from vfs. 293 */ 294 int 295 nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l) 296 { 297 char *bpos, *dpos; 298 int error = 0; 299 struct mbuf *mreq, *mrep, *md, *mb __unused; 300 struct nfsnode *np = VTONFS(vp); 301 302 nfsm_reqhead(np, NFSPROC_NULL, 0); 303 nfsm_request(np, NFSPROC_NULL, l, cred); 304 nfsm_reqdone; 305 return (error); 306 } 307 308 /* 309 * nfs access vnode op. 310 * For nfs version 2, just return ok. File accesses may fail later. 311 * For nfs version 3, use the access rpc to check accessibility. If file modes 312 * are changed on the server, accesses might still fail later. 313 */ 314 int 315 nfs_access(void *v) 316 { 317 struct vop_access_args /* { 318 struct vnode *a_vp; 319 int a_mode; 320 kauth_cred_t a_cred; 321 } */ *ap = v; 322 struct vnode *vp = ap->a_vp; 323 #ifndef NFS_V2_ONLY 324 u_int32_t *tl; 325 char *cp; 326 int32_t t1, t2; 327 char *bpos, *dpos, *cp2; 328 int error = 0, attrflag; 329 struct mbuf *mreq, *mrep, *md, *mb; 330 u_int32_t mode, rmode; 331 const int v3 = NFS_ISV3(vp); 332 #endif 333 int cachevalid; 334 struct nfsnode *np = VTONFS(vp); 335 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 336 337 cachevalid = (np->n_accstamp != -1 && 338 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 339 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 340 341 /* 342 * Check access cache first. If this request has been made for this 343 * uid shortly before, use the cached result. 344 */ 345 if (cachevalid) { 346 if (!np->n_accerror) { 347 if ((np->n_accmode & ap->a_mode) == ap->a_mode) 348 return np->n_accerror; 349 } else if ((np->n_accmode & ap->a_mode) == np->n_accmode) 350 return np->n_accerror; 351 } 352 353 #ifndef NFS_V2_ONLY 354 /* 355 * For nfs v3, do an access rpc, otherwise you are stuck emulating 356 * ufs_access() locally using the vattr. This may not be correct, 357 * since the server may apply other access criteria such as 358 * client uid-->server uid mapping that we do not know about, but 359 * this is better than just returning anything that is lying about 360 * in the cache. 361 */ 362 if (v3) { 363 nfsstats.rpccnt[NFSPROC_ACCESS]++; 364 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 365 nfsm_fhtom(np, v3); 366 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 367 if (ap->a_mode & VREAD) 368 mode = NFSV3ACCESS_READ; 369 else 370 mode = 0; 371 if (vp->v_type != VDIR) { 372 if (ap->a_mode & VWRITE) 373 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 374 if (ap->a_mode & VEXEC) 375 mode |= NFSV3ACCESS_EXECUTE; 376 } else { 377 if (ap->a_mode & VWRITE) 378 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 379 NFSV3ACCESS_DELETE); 380 if (ap->a_mode & VEXEC) 381 mode |= NFSV3ACCESS_LOOKUP; 382 } 383 *tl = txdr_unsigned(mode); 384 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 385 nfsm_postop_attr(vp, attrflag, 0); 386 if (!error) { 387 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 388 rmode = fxdr_unsigned(u_int32_t, *tl); 389 /* 390 * The NFS V3 spec does not clarify whether or not 391 * the returned access bits can be a superset of 392 * the ones requested, so... 393 */ 394 if ((rmode & mode) != mode) 395 error = EACCES; 396 } 397 nfsm_reqdone; 398 } else 399 #endif 400 return (nfsspec_access(ap)); 401 #ifndef NFS_V2_ONLY 402 /* 403 * Disallow write attempts on filesystems mounted read-only; 404 * unless the file is a socket, fifo, or a block or character 405 * device resident on the filesystem. 406 */ 407 if (!error && (ap->a_mode & VWRITE) && 408 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 409 switch (vp->v_type) { 410 case VREG: 411 case VDIR: 412 case VLNK: 413 error = EROFS; 414 default: 415 break; 416 } 417 } 418 419 if (!error || error == EACCES) { 420 /* 421 * If we got the same result as for a previous, 422 * different request, OR it in. Don't update 423 * the timestamp in that case. 424 */ 425 if (cachevalid && np->n_accstamp != -1 && 426 error == np->n_accerror) { 427 if (!error) 428 np->n_accmode |= ap->a_mode; 429 else if ((np->n_accmode & ap->a_mode) == ap->a_mode) 430 np->n_accmode = ap->a_mode; 431 } else { 432 np->n_accstamp = time_uptime; 433 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 434 np->n_accmode = ap->a_mode; 435 np->n_accerror = error; 436 } 437 } 438 439 return (error); 440 #endif 441 } 442 443 /* 444 * nfs open vnode op 445 * Check to see if the type is ok 446 * and that deletion is not in progress. 447 * For paged in text files, you will need to flush the page cache 448 * if consistency is lost. 449 */ 450 /* ARGSUSED */ 451 int 452 nfs_open(void *v) 453 { 454 struct vop_open_args /* { 455 struct vnode *a_vp; 456 int a_mode; 457 kauth_cred_t a_cred; 458 } */ *ap = v; 459 struct vnode *vp = ap->a_vp; 460 struct nfsnode *np = VTONFS(vp); 461 int error; 462 463 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 464 return (EACCES); 465 } 466 467 if (ap->a_mode & FREAD) { 468 if (np->n_rcred != NULL) 469 kauth_cred_free(np->n_rcred); 470 np->n_rcred = ap->a_cred; 471 kauth_cred_hold(np->n_rcred); 472 } 473 if (ap->a_mode & FWRITE) { 474 if (np->n_wcred != NULL) 475 kauth_cred_free(np->n_wcred); 476 np->n_wcred = ap->a_cred; 477 kauth_cred_hold(np->n_wcred); 478 } 479 480 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 481 if (error) 482 return error; 483 484 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 485 486 return (0); 487 } 488 489 /* 490 * nfs close vnode op 491 * What an NFS client should do upon close after writing is a debatable issue. 492 * Most NFS clients push delayed writes to the server upon close, basically for 493 * two reasons: 494 * 1 - So that any write errors may be reported back to the client process 495 * doing the close system call. By far the two most likely errors are 496 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 497 * 2 - To put a worst case upper bound on cache inconsistency between 498 * multiple clients for the file. 499 * There is also a consistency problem for Version 2 of the protocol w.r.t. 500 * not being able to tell if other clients are writing a file concurrently, 501 * since there is no way of knowing if the changed modify time in the reply 502 * is only due to the write for this client. 503 * (NFS Version 3 provides weak cache consistency data in the reply that 504 * should be sufficient to detect and handle this case.) 505 * 506 * The current code does the following: 507 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 508 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 509 * or commit them (this satisfies 1 and 2 except for the 510 * case where the server crashes after this close but 511 * before the commit RPC, which is felt to be "good 512 * enough". Changing the last argument to nfs_flush() to 513 * a 1 would force a commit operation, if it is felt a 514 * commit is necessary now. 515 */ 516 /* ARGSUSED */ 517 int 518 nfs_close(void *v) 519 { 520 struct vop_close_args /* { 521 struct vnodeop_desc *a_desc; 522 struct vnode *a_vp; 523 int a_fflag; 524 kauth_cred_t a_cred; 525 } */ *ap = v; 526 struct vnode *vp = ap->a_vp; 527 struct nfsnode *np = VTONFS(vp); 528 int error = 0; 529 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 530 531 if (vp->v_type == VREG) { 532 if (np->n_flag & NMODIFIED) { 533 #ifndef NFS_V2_ONLY 534 if (NFS_ISV3(vp)) { 535 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 536 np->n_flag &= ~NMODIFIED; 537 } else 538 #endif 539 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 540 NFS_INVALIDATE_ATTRCACHE(np); 541 } 542 if (np->n_flag & NWRITEERR) { 543 np->n_flag &= ~NWRITEERR; 544 error = np->n_error; 545 } 546 } 547 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 548 return (error); 549 } 550 551 /* 552 * nfs getattr call from vfs. 553 */ 554 int 555 nfs_getattr(void *v) 556 { 557 struct vop_getattr_args /* { 558 struct vnode *a_vp; 559 struct vattr *a_vap; 560 kauth_cred_t a_cred; 561 } */ *ap = v; 562 struct vnode *vp = ap->a_vp; 563 struct nfsnode *np = VTONFS(vp); 564 char *cp; 565 u_int32_t *tl; 566 int32_t t1, t2; 567 char *bpos, *dpos; 568 int error = 0; 569 struct mbuf *mreq, *mrep, *md, *mb; 570 const int v3 = NFS_ISV3(vp); 571 572 /* 573 * Update local times for special files. 574 */ 575 if (np->n_flag & (NACC | NUPD)) 576 np->n_flag |= NCHG; 577 578 /* 579 * if we have delayed truncation, do it now. 580 */ 581 nfs_delayedtruncate(vp); 582 583 /* 584 * First look in the cache. 585 */ 586 if (nfs_getattrcache(vp, ap->a_vap) == 0) 587 return (0); 588 nfsstats.rpccnt[NFSPROC_GETATTR]++; 589 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 590 nfsm_fhtom(np, v3); 591 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 592 if (!error) { 593 nfsm_loadattr(vp, ap->a_vap, 0); 594 if (vp->v_type == VDIR && 595 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 596 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 597 } 598 nfsm_reqdone; 599 return (error); 600 } 601 602 /* 603 * nfs setattr call. 604 */ 605 int 606 nfs_setattr(void *v) 607 { 608 struct vop_setattr_args /* { 609 struct vnodeop_desc *a_desc; 610 struct vnode *a_vp; 611 struct vattr *a_vap; 612 kauth_cred_t a_cred; 613 } */ *ap = v; 614 struct vnode *vp = ap->a_vp; 615 struct nfsnode *np = VTONFS(vp); 616 struct vattr *vap = ap->a_vap; 617 int error = 0; 618 u_quad_t tsize = 0; 619 620 /* 621 * Setting of flags is not supported. 622 */ 623 if (vap->va_flags != VNOVAL) 624 return (EOPNOTSUPP); 625 626 /* 627 * Disallow write attempts if the filesystem is mounted read-only. 628 */ 629 if ((vap->va_uid != (uid_t)VNOVAL || 630 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 631 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 632 (vp->v_mount->mnt_flag & MNT_RDONLY)) 633 return (EROFS); 634 if (vap->va_size != VNOVAL) { 635 if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { 636 return EFBIG; 637 } 638 switch (vp->v_type) { 639 case VDIR: 640 return (EISDIR); 641 case VCHR: 642 case VBLK: 643 case VSOCK: 644 case VFIFO: 645 if (vap->va_mtime.tv_sec == VNOVAL && 646 vap->va_atime.tv_sec == VNOVAL && 647 vap->va_mode == (mode_t)VNOVAL && 648 vap->va_uid == (uid_t)VNOVAL && 649 vap->va_gid == (gid_t)VNOVAL) 650 return (0); 651 vap->va_size = VNOVAL; 652 break; 653 default: 654 /* 655 * Disallow write attempts if the filesystem is 656 * mounted read-only. 657 */ 658 if (vp->v_mount->mnt_flag & MNT_RDONLY) 659 return (EROFS); 660 genfs_node_wrlock(vp); 661 uvm_vnp_setsize(vp, vap->va_size); 662 tsize = np->n_size; 663 np->n_size = vap->va_size; 664 if (vap->va_size == 0) 665 error = nfs_vinvalbuf(vp, 0, 666 ap->a_cred, curlwp, 1); 667 else 668 error = nfs_vinvalbuf(vp, V_SAVE, 669 ap->a_cred, curlwp, 1); 670 if (error) { 671 uvm_vnp_setsize(vp, tsize); 672 genfs_node_unlock(vp); 673 return (error); 674 } 675 np->n_vattr->va_size = vap->va_size; 676 } 677 } else { 678 /* 679 * flush files before setattr because a later write of 680 * cached data might change timestamps or reset sugid bits 681 */ 682 if ((vap->va_mtime.tv_sec != VNOVAL || 683 vap->va_atime.tv_sec != VNOVAL || 684 vap->va_mode != VNOVAL) && 685 vp->v_type == VREG && 686 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 687 curlwp, 1)) == EINTR) 688 return (error); 689 } 690 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 691 if (vap->va_size != VNOVAL) { 692 if (error) { 693 np->n_size = np->n_vattr->va_size = tsize; 694 uvm_vnp_setsize(vp, np->n_size); 695 } 696 genfs_node_unlock(vp); 697 } 698 VN_KNOTE(vp, NOTE_ATTRIB); 699 return (error); 700 } 701 702 /* 703 * Do an nfs setattr rpc. 704 */ 705 int 706 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, struct lwp *l) 707 { 708 struct nfsv2_sattr *sp; 709 char *cp; 710 int32_t t1, t2; 711 char *bpos, *dpos; 712 u_int32_t *tl; 713 int error = 0; 714 struct mbuf *mreq, *mrep, *md, *mb; 715 const int v3 = NFS_ISV3(vp); 716 struct nfsnode *np = VTONFS(vp); 717 #ifndef NFS_V2_ONLY 718 int wccflag = NFSV3_WCCRATTR; 719 char *cp2; 720 #endif 721 722 nfsstats.rpccnt[NFSPROC_SETATTR]++; 723 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 724 nfsm_fhtom(np, v3); 725 #ifndef NFS_V2_ONLY 726 if (v3) { 727 nfsm_v3attrbuild(vap, true); 728 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 729 *tl = nfs_false; 730 } else { 731 #endif 732 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 733 if (vap->va_mode == (mode_t)VNOVAL) 734 sp->sa_mode = nfs_xdrneg1; 735 else 736 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 737 if (vap->va_uid == (uid_t)VNOVAL) 738 sp->sa_uid = nfs_xdrneg1; 739 else 740 sp->sa_uid = txdr_unsigned(vap->va_uid); 741 if (vap->va_gid == (gid_t)VNOVAL) 742 sp->sa_gid = nfs_xdrneg1; 743 else 744 sp->sa_gid = txdr_unsigned(vap->va_gid); 745 sp->sa_size = txdr_unsigned(vap->va_size); 746 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 747 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 748 #ifndef NFS_V2_ONLY 749 } 750 #endif 751 nfsm_request(np, NFSPROC_SETATTR, l, cred); 752 #ifndef NFS_V2_ONLY 753 if (v3) { 754 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 755 } else 756 #endif 757 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 758 nfsm_reqdone; 759 return (error); 760 } 761 762 /* 763 * nfs lookup call, one step at a time... 764 * First look in cache 765 * If not found, do the rpc. 766 */ 767 int 768 nfs_lookup(void *v) 769 { 770 struct vop_lookup_v2_args /* { 771 struct vnodeop_desc *a_desc; 772 struct vnode *a_dvp; 773 struct vnode **a_vpp; 774 struct componentname *a_cnp; 775 } */ *ap = v; 776 struct componentname *cnp = ap->a_cnp; 777 struct vnode *dvp = ap->a_dvp; 778 struct vnode **vpp = ap->a_vpp; 779 int flags; 780 struct vnode *newvp; 781 u_int32_t *tl; 782 char *cp; 783 int32_t t1, t2; 784 char *bpos, *dpos, *cp2; 785 struct mbuf *mreq, *mrep, *md, *mb; 786 long len; 787 nfsfh_t *fhp; 788 struct nfsnode *np; 789 int cachefound; 790 int error = 0, attrflag, fhsize; 791 const int v3 = NFS_ISV3(dvp); 792 793 flags = cnp->cn_flags; 794 795 *vpp = NULLVP; 796 newvp = NULLVP; 797 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 798 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 799 return (EROFS); 800 if (dvp->v_type != VDIR) 801 return (ENOTDIR); 802 803 /* 804 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 805 */ 806 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 807 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 808 if (error) 809 return error; 810 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 811 return EISDIR; 812 vref(dvp); 813 *vpp = dvp; 814 return 0; 815 } 816 817 np = VTONFS(dvp); 818 819 /* 820 * Before performing an RPC, check the name cache to see if 821 * the directory/name pair we are looking for is known already. 822 * If the directory/name pair is found in the name cache, 823 * we have to ensure the directory has not changed from 824 * the time the cache entry has been created. If it has, 825 * the cache entry has to be ignored. 826 */ 827 cachefound = cache_lookup_raw(dvp, cnp->cn_nameptr, cnp->cn_namelen, 828 cnp->cn_flags, NULL, vpp); 829 KASSERT(dvp != *vpp); 830 KASSERT((cnp->cn_flags & ISWHITEOUT) == 0); 831 if (cachefound) { 832 struct vattr vattr; 833 834 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 835 if (error != 0) { 836 if (*vpp != NULLVP) 837 vrele(*vpp); 838 *vpp = NULLVP; 839 return error; 840 } 841 842 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 843 || timespeccmp(&vattr.va_mtime, 844 &VTONFS(dvp)->n_nctime, !=)) { 845 if (*vpp != NULLVP) { 846 vrele(*vpp); 847 *vpp = NULLVP; 848 } 849 cache_purge1(dvp, NULL, 0, PURGE_CHILDREN); 850 timespecclear(&np->n_nctime); 851 goto dorpc; 852 } 853 854 if (*vpp == NULLVP) { 855 /* namecache gave us a negative result */ 856 error = ENOENT; 857 goto noentry; 858 } 859 860 /* 861 * investigate the vnode returned by cache_lookup_raw. 862 * if it isn't appropriate, do an rpc. 863 */ 864 newvp = *vpp; 865 if ((flags & ISDOTDOT) != 0) { 866 VOP_UNLOCK(dvp); 867 } 868 error = vn_lock(newvp, LK_SHARED); 869 if ((flags & ISDOTDOT) != 0) { 870 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 871 } 872 if (error != 0) { 873 /* newvp has been reclaimed. */ 874 vrele(newvp); 875 *vpp = NULLVP; 876 goto dorpc; 877 } 878 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 879 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 880 nfsstats.lookupcache_hits++; 881 KASSERT(newvp->v_type != VNON); 882 VOP_UNLOCK(newvp); 883 return (0); 884 } 885 cache_purge1(newvp, NULL, 0, PURGE_PARENTS); 886 vput(newvp); 887 *vpp = NULLVP; 888 } 889 dorpc: 890 #if 0 891 /* 892 * because nfsv3 has the same CREATE semantics as ours, 893 * we don't have to perform LOOKUPs beforehand. 894 * 895 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 896 * XXX although we have no way to know if O_EXCL is requested or not. 897 */ 898 899 if (v3 && cnp->cn_nameiop == CREATE && 900 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 901 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 902 return (EJUSTRETURN); 903 } 904 #endif /* 0 */ 905 906 error = 0; 907 newvp = NULLVP; 908 nfsstats.lookupcache_misses++; 909 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 910 len = cnp->cn_namelen; 911 nfsm_reqhead(np, NFSPROC_LOOKUP, 912 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 913 nfsm_fhtom(np, v3); 914 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 915 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 916 if (error) { 917 nfsm_postop_attr(dvp, attrflag, 0); 918 m_freem(mrep); 919 goto nfsmout; 920 } 921 nfsm_getfh(fhp, fhsize, v3); 922 923 /* 924 * Handle RENAME case... 925 */ 926 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 927 if (NFS_CMPFH(np, fhp, fhsize)) { 928 m_freem(mrep); 929 return (EISDIR); 930 } 931 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 932 if (error) { 933 m_freem(mrep); 934 return error; 935 } 936 newvp = NFSTOV(np); 937 #ifndef NFS_V2_ONLY 938 if (v3) { 939 nfsm_postop_attr(newvp, attrflag, 0); 940 nfsm_postop_attr(dvp, attrflag, 0); 941 } else 942 #endif 943 nfsm_loadattr(newvp, (struct vattr *)0, 0); 944 *vpp = newvp; 945 m_freem(mrep); 946 goto validate; 947 } 948 949 /* 950 * The postop attr handling is duplicated for each if case, 951 * because it should be done while dvp is locked (unlocking 952 * dvp is different for each case). 953 */ 954 955 if (NFS_CMPFH(np, fhp, fhsize)) { 956 /* 957 * As we handle "." lookup locally, this is 958 * a broken server. 959 */ 960 m_freem(mrep); 961 return EBADRPC; 962 } else if (flags & ISDOTDOT) { 963 /* 964 * ".." lookup 965 */ 966 VOP_UNLOCK(dvp); 967 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 968 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 969 if (error) { 970 m_freem(mrep); 971 return error; 972 } 973 newvp = NFSTOV(np); 974 975 #ifndef NFS_V2_ONLY 976 if (v3) { 977 nfsm_postop_attr(newvp, attrflag, 0); 978 nfsm_postop_attr(dvp, attrflag, 0); 979 } else 980 #endif 981 nfsm_loadattr(newvp, (struct vattr *)0, 0); 982 } else { 983 /* 984 * Other lookups. 985 */ 986 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 987 if (error) { 988 m_freem(mrep); 989 return error; 990 } 991 newvp = NFSTOV(np); 992 #ifndef NFS_V2_ONLY 993 if (v3) { 994 nfsm_postop_attr(newvp, attrflag, 0); 995 nfsm_postop_attr(dvp, attrflag, 0); 996 } else 997 #endif 998 nfsm_loadattr(newvp, (struct vattr *)0, 0); 999 } 1000 if (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) { 1001 nfs_cache_enter(dvp, newvp, cnp); 1002 } 1003 *vpp = newvp; 1004 nfsm_reqdone; 1005 if (error) { 1006 /* 1007 * We get here only because of errors returned by 1008 * the RPC. Otherwise we'll have returned above 1009 * (the nfsm_* macros will jump to nfsm_reqdone 1010 * on error). 1011 */ 1012 if (error == ENOENT && cnp->cn_nameiop != CREATE) { 1013 nfs_cache_enter(dvp, NULL, cnp); 1014 } 1015 if (newvp != NULLVP) { 1016 if (newvp == dvp) { 1017 vrele(newvp); 1018 } else { 1019 vput(newvp); 1020 } 1021 } 1022 noentry: 1023 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1024 (flags & ISLASTCN) && error == ENOENT) { 1025 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 1026 error = EROFS; 1027 } else { 1028 error = EJUSTRETURN; 1029 } 1030 } 1031 *vpp = NULL; 1032 return error; 1033 } 1034 1035 validate: 1036 /* 1037 * make sure we have valid type and size. 1038 */ 1039 1040 newvp = *vpp; 1041 if (newvp->v_type == VNON) { 1042 struct vattr vattr; /* dummy */ 1043 1044 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1045 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1046 if (error) { 1047 vput(newvp); 1048 *vpp = NULL; 1049 } 1050 } 1051 if (error) 1052 return error; 1053 if (newvp != dvp) 1054 VOP_UNLOCK(newvp); 1055 return 0; 1056 } 1057 1058 /* 1059 * nfs read call. 1060 * Just call nfs_bioread() to do the work. 1061 */ 1062 int 1063 nfs_read(void *v) 1064 { 1065 struct vop_read_args /* { 1066 struct vnode *a_vp; 1067 struct uio *a_uio; 1068 int a_ioflag; 1069 kauth_cred_t a_cred; 1070 } */ *ap = v; 1071 struct vnode *vp = ap->a_vp; 1072 1073 if (vp->v_type != VREG) 1074 return EISDIR; 1075 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1076 } 1077 1078 /* 1079 * nfs readlink call 1080 */ 1081 int 1082 nfs_readlink(void *v) 1083 { 1084 struct vop_readlink_args /* { 1085 struct vnode *a_vp; 1086 struct uio *a_uio; 1087 kauth_cred_t a_cred; 1088 } */ *ap = v; 1089 struct vnode *vp = ap->a_vp; 1090 struct nfsnode *np = VTONFS(vp); 1091 1092 if (vp->v_type != VLNK) 1093 return (EPERM); 1094 1095 if (np->n_rcred != NULL) { 1096 kauth_cred_free(np->n_rcred); 1097 } 1098 np->n_rcred = ap->a_cred; 1099 kauth_cred_hold(np->n_rcred); 1100 1101 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1102 } 1103 1104 /* 1105 * Do a readlink rpc. 1106 * Called by nfs_doio() from below the buffer cache. 1107 */ 1108 int 1109 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 1110 { 1111 u_int32_t *tl; 1112 char *cp; 1113 int32_t t1, t2; 1114 char *bpos, *dpos, *cp2; 1115 int error = 0; 1116 uint32_t len; 1117 struct mbuf *mreq, *mrep, *md, *mb; 1118 const int v3 = NFS_ISV3(vp); 1119 struct nfsnode *np = VTONFS(vp); 1120 #ifndef NFS_V2_ONLY 1121 int attrflag; 1122 #endif 1123 1124 nfsstats.rpccnt[NFSPROC_READLINK]++; 1125 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1126 nfsm_fhtom(np, v3); 1127 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1128 #ifndef NFS_V2_ONLY 1129 if (v3) 1130 nfsm_postop_attr(vp, attrflag, 0); 1131 #endif 1132 if (!error) { 1133 #ifndef NFS_V2_ONLY 1134 if (v3) { 1135 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1136 len = fxdr_unsigned(uint32_t, *tl); 1137 if (len > NFS_MAXPATHLEN) { 1138 /* 1139 * this pathname is too long for us. 1140 */ 1141 m_freem(mrep); 1142 /* Solaris returns EINVAL. should we follow? */ 1143 error = ENAMETOOLONG; 1144 goto nfsmout; 1145 } 1146 } else 1147 #endif 1148 { 1149 nfsm_strsiz(len, NFS_MAXPATHLEN); 1150 } 1151 nfsm_mtouio(uiop, len); 1152 } 1153 nfsm_reqdone; 1154 return (error); 1155 } 1156 1157 /* 1158 * nfs read rpc call 1159 * Ditto above 1160 */ 1161 int 1162 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1163 { 1164 u_int32_t *tl; 1165 char *cp; 1166 int32_t t1, t2; 1167 char *bpos, *dpos, *cp2; 1168 struct mbuf *mreq, *mrep, *md, *mb; 1169 struct nfsmount *nmp; 1170 int error = 0, len, retlen, tsiz, eof __unused, byte_count; 1171 const int v3 = NFS_ISV3(vp); 1172 struct nfsnode *np = VTONFS(vp); 1173 #ifndef NFS_V2_ONLY 1174 int attrflag; 1175 #endif 1176 1177 #ifndef nolint 1178 eof = 0; 1179 #endif 1180 nmp = VFSTONFS(vp->v_mount); 1181 tsiz = uiop->uio_resid; 1182 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1183 return (EFBIG); 1184 iostat_busy(nmp->nm_stats); 1185 byte_count = 0; /* count bytes actually transferred */ 1186 while (tsiz > 0) { 1187 nfsstats.rpccnt[NFSPROC_READ]++; 1188 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1189 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1190 nfsm_fhtom(np, v3); 1191 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1192 #ifndef NFS_V2_ONLY 1193 if (v3) { 1194 txdr_hyper(uiop->uio_offset, tl); 1195 *(tl + 2) = txdr_unsigned(len); 1196 } else 1197 #endif 1198 { 1199 *tl++ = txdr_unsigned(uiop->uio_offset); 1200 *tl++ = txdr_unsigned(len); 1201 *tl = 0; 1202 } 1203 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1204 #ifndef NFS_V2_ONLY 1205 if (v3) { 1206 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1207 if (error) { 1208 m_freem(mrep); 1209 goto nfsmout; 1210 } 1211 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1212 eof = fxdr_unsigned(int, *(tl + 1)); 1213 } else 1214 #endif 1215 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1216 nfsm_strsiz(retlen, nmp->nm_rsize); 1217 nfsm_mtouio(uiop, retlen); 1218 m_freem(mrep); 1219 tsiz -= retlen; 1220 byte_count += retlen; 1221 #ifndef NFS_V2_ONLY 1222 if (v3) { 1223 if (eof || retlen == 0) 1224 tsiz = 0; 1225 } else 1226 #endif 1227 if (retlen < len) 1228 tsiz = 0; 1229 } 1230 nfsmout: 1231 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1232 return (error); 1233 } 1234 1235 struct nfs_writerpc_context { 1236 kmutex_t nwc_lock; 1237 kcondvar_t nwc_cv; 1238 int nwc_mbufcount; 1239 }; 1240 1241 /* 1242 * free mbuf used to refer protected pages while write rpc call. 1243 * called at splvm. 1244 */ 1245 static void 1246 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1247 { 1248 struct nfs_writerpc_context *ctx = arg; 1249 1250 KASSERT(m != NULL); 1251 KASSERT(ctx != NULL); 1252 pool_cache_put(mb_cache, m); 1253 mutex_enter(&ctx->nwc_lock); 1254 if (--ctx->nwc_mbufcount == 0) { 1255 cv_signal(&ctx->nwc_cv); 1256 } 1257 mutex_exit(&ctx->nwc_lock); 1258 } 1259 1260 /* 1261 * nfs write call 1262 */ 1263 int 1264 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp) 1265 { 1266 u_int32_t *tl; 1267 char *cp; 1268 int32_t t1, t2; 1269 char *bpos, *dpos; 1270 struct mbuf *mreq, *mrep, *md, *mb; 1271 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1272 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1273 const int v3 = NFS_ISV3(vp); 1274 int committed = NFSV3WRITE_FILESYNC; 1275 struct nfsnode *np = VTONFS(vp); 1276 struct nfs_writerpc_context ctx; 1277 int byte_count; 1278 size_t origresid; 1279 #ifndef NFS_V2_ONLY 1280 char *cp2; 1281 int rlen, commit; 1282 #endif 1283 1284 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1285 panic("writerpc readonly vp %p", vp); 1286 } 1287 1288 #ifdef DIAGNOSTIC 1289 if (uiop->uio_iovcnt != 1) 1290 panic("nfs: writerpc iovcnt > 1"); 1291 #endif 1292 tsiz = uiop->uio_resid; 1293 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1294 return EFBIG; 1295 1296 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1297 cv_init(&ctx.nwc_cv, "nfsmblk"); 1298 ctx.nwc_mbufcount = 1; 1299 1300 retry: 1301 origresid = uiop->uio_resid; 1302 KASSERT(origresid == uiop->uio_iov->iov_len); 1303 iostat_busy(nmp->nm_stats); 1304 byte_count = 0; /* count of bytes actually written */ 1305 while (tsiz > 0) { 1306 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1307 size_t backup; 1308 bool stalewriteverf = false; 1309 1310 nfsstats.rpccnt[NFSPROC_WRITE]++; 1311 len = min(tsiz, nmp->nm_wsize); 1312 datalen = pageprotected ? 0 : nfsm_rndup(len); 1313 nfsm_reqhead(np, NFSPROC_WRITE, 1314 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1315 nfsm_fhtom(np, v3); 1316 #ifndef NFS_V2_ONLY 1317 if (v3) { 1318 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1319 txdr_hyper(uiop->uio_offset, tl); 1320 tl += 2; 1321 *tl++ = txdr_unsigned(len); 1322 *tl++ = txdr_unsigned(*iomode); 1323 *tl = txdr_unsigned(len); 1324 } else 1325 #endif 1326 { 1327 u_int32_t x; 1328 1329 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1330 /* Set both "begin" and "current" to non-garbage. */ 1331 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1332 *tl++ = x; /* "begin offset" */ 1333 *tl++ = x; /* "current offset" */ 1334 x = txdr_unsigned(len); 1335 *tl++ = x; /* total to this offset */ 1336 *tl = x; /* size of this write */ 1337 1338 } 1339 if (pageprotected) { 1340 /* 1341 * since we know pages can't be modified during i/o, 1342 * no need to copy them for us. 1343 */ 1344 struct mbuf *m; 1345 struct iovec *iovp = uiop->uio_iov; 1346 1347 m = m_get(M_WAIT, MT_DATA); 1348 MCLAIM(m, &nfs_mowner); 1349 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1350 nfs_writerpc_extfree, &ctx); 1351 m->m_flags |= M_EXT_ROMAP; 1352 m->m_len = len; 1353 mb->m_next = m; 1354 /* 1355 * no need to maintain mb and bpos here 1356 * because no one care them later. 1357 */ 1358 #if 0 1359 mb = m; 1360 bpos = mtod(void *, mb) + mb->m_len; 1361 #endif 1362 UIO_ADVANCE(uiop, len); 1363 uiop->uio_offset += len; 1364 mutex_enter(&ctx.nwc_lock); 1365 ctx.nwc_mbufcount++; 1366 mutex_exit(&ctx.nwc_lock); 1367 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1368 } else { 1369 nfsm_uiotom(uiop, len); 1370 } 1371 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1372 #ifndef NFS_V2_ONLY 1373 if (v3) { 1374 wccflag = NFSV3_WCCCHK; 1375 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1376 if (!error) { 1377 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1378 + NFSX_V3WRITEVERF); 1379 rlen = fxdr_unsigned(int, *tl++); 1380 if (rlen == 0) { 1381 error = NFSERR_IO; 1382 m_freem(mrep); 1383 break; 1384 } else if (rlen < len) { 1385 backup = len - rlen; 1386 UIO_ADVANCE(uiop, -backup); 1387 uiop->uio_offset -= backup; 1388 len = rlen; 1389 } 1390 commit = fxdr_unsigned(int, *tl++); 1391 1392 /* 1393 * Return the lowest committment level 1394 * obtained by any of the RPCs. 1395 */ 1396 if (committed == NFSV3WRITE_FILESYNC) 1397 committed = commit; 1398 else if (committed == NFSV3WRITE_DATASYNC && 1399 commit == NFSV3WRITE_UNSTABLE) 1400 committed = commit; 1401 mutex_enter(&nmp->nm_lock); 1402 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1403 memcpy(nmp->nm_writeverf, tl, 1404 NFSX_V3WRITEVERF); 1405 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1406 } else if ((nmp->nm_iflag & 1407 NFSMNT_STALEWRITEVERF) || 1408 memcmp(tl, nmp->nm_writeverf, 1409 NFSX_V3WRITEVERF)) { 1410 memcpy(nmp->nm_writeverf, tl, 1411 NFSX_V3WRITEVERF); 1412 /* 1413 * note NFSMNT_STALEWRITEVERF 1414 * if we're the first thread to 1415 * notice it. 1416 */ 1417 if ((nmp->nm_iflag & 1418 NFSMNT_STALEWRITEVERF) == 0) { 1419 stalewriteverf = true; 1420 nmp->nm_iflag |= 1421 NFSMNT_STALEWRITEVERF; 1422 } 1423 } 1424 mutex_exit(&nmp->nm_lock); 1425 } 1426 } else 1427 #endif 1428 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1429 if (wccflag) 1430 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1431 m_freem(mrep); 1432 if (error) 1433 break; 1434 tsiz -= len; 1435 byte_count += len; 1436 if (stalewriteverf) { 1437 *stalewriteverfp = true; 1438 stalewriteverf = false; 1439 if (committed == NFSV3WRITE_UNSTABLE && 1440 len != origresid) { 1441 /* 1442 * if our write requests weren't atomic but 1443 * unstable, datas in previous iterations 1444 * might have already been lost now. 1445 * then, we should resend them to nfsd. 1446 */ 1447 backup = origresid - tsiz; 1448 UIO_ADVANCE(uiop, -backup); 1449 uiop->uio_offset -= backup; 1450 tsiz = origresid; 1451 goto retry; 1452 } 1453 } 1454 } 1455 nfsmout: 1456 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1457 if (pageprotected) { 1458 /* 1459 * wait until mbufs go away. 1460 * retransmitted mbufs can survive longer than rpc requests 1461 * themselves. 1462 */ 1463 mutex_enter(&ctx.nwc_lock); 1464 ctx.nwc_mbufcount--; 1465 while (ctx.nwc_mbufcount > 0) { 1466 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1467 } 1468 mutex_exit(&ctx.nwc_lock); 1469 } 1470 mutex_destroy(&ctx.nwc_lock); 1471 cv_destroy(&ctx.nwc_cv); 1472 *iomode = committed; 1473 if (error) 1474 uiop->uio_resid = tsiz; 1475 return (error); 1476 } 1477 1478 /* 1479 * nfs mknod rpc 1480 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1481 * mode set to specify the file type and the size field for rdev. 1482 */ 1483 int 1484 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) 1485 { 1486 struct nfsv2_sattr *sp; 1487 u_int32_t *tl; 1488 char *cp; 1489 int32_t t1, t2; 1490 struct vnode *newvp = (struct vnode *)0; 1491 struct nfsnode *dnp, *np; 1492 char *cp2; 1493 char *bpos, *dpos; 1494 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1495 struct mbuf *mreq, *mrep, *md, *mb; 1496 u_int32_t rdev; 1497 const int v3 = NFS_ISV3(dvp); 1498 1499 if (vap->va_type == VCHR || vap->va_type == VBLK) 1500 rdev = txdr_unsigned(vap->va_rdev); 1501 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1502 rdev = nfs_xdrneg1; 1503 else { 1504 VOP_ABORTOP(dvp, cnp); 1505 return (EOPNOTSUPP); 1506 } 1507 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1508 dnp = VTONFS(dvp); 1509 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1510 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1511 nfsm_fhtom(dnp, v3); 1512 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1513 #ifndef NFS_V2_ONLY 1514 if (v3) { 1515 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1516 *tl++ = vtonfsv3_type(vap->va_type); 1517 nfsm_v3attrbuild(vap, false); 1518 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1519 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1520 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1521 *tl = txdr_unsigned(minor(vap->va_rdev)); 1522 } 1523 } else 1524 #endif 1525 { 1526 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1527 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1528 sp->sa_uid = nfs_xdrneg1; 1529 sp->sa_gid = nfs_xdrneg1; 1530 sp->sa_size = rdev; 1531 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1532 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1533 } 1534 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1535 if (!error) { 1536 nfsm_mtofh(dvp, newvp, v3, gotvp); 1537 if (!gotvp) { 1538 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1539 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1540 if (!error) 1541 newvp = NFSTOV(np); 1542 } 1543 } 1544 #ifndef NFS_V2_ONLY 1545 if (v3) 1546 nfsm_wcc_data(dvp, wccflag, 0, !error); 1547 #endif 1548 nfsm_reqdone; 1549 if (error) { 1550 if (newvp) 1551 vput(newvp); 1552 } else { 1553 nfs_cache_enter(dvp, newvp, cnp); 1554 *vpp = newvp; 1555 VOP_UNLOCK(newvp); 1556 } 1557 VTONFS(dvp)->n_flag |= NMODIFIED; 1558 if (!wccflag) 1559 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1560 return (error); 1561 } 1562 1563 /* 1564 * nfs mknod vop 1565 * just call nfs_mknodrpc() to do the work. 1566 */ 1567 /* ARGSUSED */ 1568 int 1569 nfs_mknod(void *v) 1570 { 1571 struct vop_mknod_v3_args /* { 1572 struct vnode *a_dvp; 1573 struct vnode **a_vpp; 1574 struct componentname *a_cnp; 1575 struct vattr *a_vap; 1576 } */ *ap = v; 1577 struct vnode *dvp = ap->a_dvp; 1578 struct componentname *cnp = ap->a_cnp; 1579 int error; 1580 1581 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap); 1582 VN_KNOTE(dvp, NOTE_WRITE); 1583 if (error == 0 || error == EEXIST) 1584 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1585 return (error); 1586 } 1587 1588 /* 1589 * nfs file create call 1590 */ 1591 int 1592 nfs_create(void *v) 1593 { 1594 struct vop_create_v3_args /* { 1595 struct vnode *a_dvp; 1596 struct vnode **a_vpp; 1597 struct componentname *a_cnp; 1598 struct vattr *a_vap; 1599 } */ *ap = v; 1600 struct vnode *dvp = ap->a_dvp; 1601 struct vattr *vap = ap->a_vap; 1602 struct componentname *cnp = ap->a_cnp; 1603 struct nfsv2_sattr *sp; 1604 u_int32_t *tl; 1605 char *cp; 1606 int32_t t1, t2; 1607 struct nfsnode *dnp, *np = (struct nfsnode *)0; 1608 struct vnode *newvp = (struct vnode *)0; 1609 char *bpos, *dpos, *cp2; 1610 int error, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1611 struct mbuf *mreq, *mrep, *md, *mb; 1612 const int v3 = NFS_ISV3(dvp); 1613 u_int32_t excl_mode = NFSV3CREATE_UNCHECKED; 1614 1615 /* 1616 * Oops, not for me.. 1617 */ 1618 if (vap->va_type == VSOCK) 1619 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1620 1621 KASSERT(vap->va_type == VREG); 1622 1623 #ifdef VA_EXCLUSIVE 1624 if (vap->va_vaflags & VA_EXCLUSIVE) { 1625 excl_mode = NFSV3CREATE_EXCLUSIVE; 1626 } 1627 #endif 1628 again: 1629 error = 0; 1630 nfsstats.rpccnt[NFSPROC_CREATE]++; 1631 dnp = VTONFS(dvp); 1632 nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1633 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1634 nfsm_fhtom(dnp, v3); 1635 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1636 #ifndef NFS_V2_ONLY 1637 if (v3) { 1638 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1639 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1640 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1641 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1642 *tl++ = cprng_fast32(); 1643 *tl = cprng_fast32(); 1644 } else { 1645 *tl = txdr_unsigned(excl_mode); 1646 nfsm_v3attrbuild(vap, false); 1647 } 1648 } else 1649 #endif 1650 { 1651 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1652 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1653 sp->sa_uid = nfs_xdrneg1; 1654 sp->sa_gid = nfs_xdrneg1; 1655 sp->sa_size = 0; 1656 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1657 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1658 } 1659 nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred); 1660 if (!error) { 1661 nfsm_mtofh(dvp, newvp, v3, gotvp); 1662 if (!gotvp) { 1663 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1664 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1665 if (!error) 1666 newvp = NFSTOV(np); 1667 } 1668 } 1669 #ifndef NFS_V2_ONLY 1670 if (v3) 1671 nfsm_wcc_data(dvp, wccflag, 0, !error); 1672 #endif 1673 nfsm_reqdone; 1674 if (error) { 1675 /* 1676 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 1677 */ 1678 if (v3 && error == ENOTSUP) { 1679 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1680 excl_mode = NFSV3CREATE_GUARDED; 1681 goto again; 1682 } else if (excl_mode == NFSV3CREATE_GUARDED) { 1683 excl_mode = NFSV3CREATE_UNCHECKED; 1684 goto again; 1685 } 1686 } 1687 } else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) { 1688 struct timespec ts; 1689 1690 getnanotime(&ts); 1691 1692 /* 1693 * make sure that we'll update timestamps as 1694 * most server implementations use them to store 1695 * the create verifier. 1696 * 1697 * XXX it's better to use TOSERVER always. 1698 */ 1699 1700 if (vap->va_atime.tv_sec == VNOVAL) 1701 vap->va_atime = ts; 1702 if (vap->va_mtime.tv_sec == VNOVAL) 1703 vap->va_mtime = ts; 1704 1705 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp); 1706 } 1707 if (error == 0) { 1708 if (cnp->cn_flags & MAKEENTRY) 1709 nfs_cache_enter(dvp, newvp, cnp); 1710 else 1711 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1712 *ap->a_vpp = newvp; 1713 VOP_UNLOCK(newvp); 1714 } else { 1715 if (newvp) 1716 vput(newvp); 1717 if (error == EEXIST) 1718 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1719 } 1720 VTONFS(dvp)->n_flag |= NMODIFIED; 1721 if (!wccflag) 1722 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1723 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1724 return (error); 1725 } 1726 1727 /* 1728 * nfs file remove call 1729 * To try and make nfs semantics closer to ufs semantics, a file that has 1730 * other processes using the vnode is renamed instead of removed and then 1731 * removed later on the last close. 1732 * - If v_usecount > 1 1733 * If a rename is not already in the works 1734 * call nfs_sillyrename() to set it up 1735 * else 1736 * do the remove rpc 1737 */ 1738 int 1739 nfs_remove(void *v) 1740 { 1741 struct vop_remove_args /* { 1742 struct vnodeop_desc *a_desc; 1743 struct vnode * a_dvp; 1744 struct vnode * a_vp; 1745 struct componentname * a_cnp; 1746 } */ *ap = v; 1747 struct vnode *vp = ap->a_vp; 1748 struct vnode *dvp = ap->a_dvp; 1749 struct componentname *cnp = ap->a_cnp; 1750 struct nfsnode *np = VTONFS(vp); 1751 int error = 0; 1752 struct vattr vattr; 1753 1754 #ifndef DIAGNOSTIC 1755 if (vp->v_usecount < 1) 1756 panic("nfs_remove: bad v_usecount"); 1757 #endif 1758 if (vp->v_type == VDIR) 1759 error = EPERM; 1760 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1761 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1762 vattr.va_nlink > 1)) { 1763 /* 1764 * Purge the name cache so that the chance of a lookup for 1765 * the name succeeding while the remove is in progress is 1766 * minimized. Without node locking it can still happen, such 1767 * that an I/O op returns ESTALE, but since you get this if 1768 * another host removes the file.. 1769 */ 1770 cache_purge(vp); 1771 /* 1772 * throw away biocache buffers, mainly to avoid 1773 * unnecessary delayed writes later. 1774 */ 1775 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1776 /* Do the rpc */ 1777 if (error != EINTR) 1778 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1779 cnp->cn_namelen, cnp->cn_cred, curlwp); 1780 } else if (!np->n_sillyrename) 1781 error = nfs_sillyrename(dvp, vp, cnp, false); 1782 if (!error && nfs_getattrcache(vp, &vattr) == 0 && 1783 vattr.va_nlink == 1) { 1784 np->n_flag |= NREMOVED; 1785 } 1786 NFS_INVALIDATE_ATTRCACHE(np); 1787 VN_KNOTE(vp, NOTE_DELETE); 1788 VN_KNOTE(dvp, NOTE_WRITE); 1789 if (dvp == vp) 1790 vrele(vp); 1791 else 1792 vput(vp); 1793 vput(dvp); 1794 return (error); 1795 } 1796 1797 /* 1798 * nfs file remove rpc called from nfs_inactive 1799 */ 1800 int 1801 nfs_removeit(struct sillyrename *sp) 1802 { 1803 1804 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1805 (struct lwp *)0)); 1806 } 1807 1808 /* 1809 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1810 */ 1811 int 1812 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l) 1813 { 1814 u_int32_t *tl; 1815 char *cp; 1816 #ifndef NFS_V2_ONLY 1817 int32_t t1; 1818 char *cp2; 1819 #endif 1820 int32_t t2; 1821 char *bpos, *dpos; 1822 int error = 0, wccflag = NFSV3_WCCRATTR; 1823 struct mbuf *mreq, *mrep, *md, *mb; 1824 const int v3 = NFS_ISV3(dvp); 1825 int rexmit = 0; 1826 struct nfsnode *dnp = VTONFS(dvp); 1827 1828 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1829 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1830 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1831 nfsm_fhtom(dnp, v3); 1832 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1833 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1834 #ifndef NFS_V2_ONLY 1835 if (v3) 1836 nfsm_wcc_data(dvp, wccflag, 0, !error); 1837 #endif 1838 nfsm_reqdone; 1839 VTONFS(dvp)->n_flag |= NMODIFIED; 1840 if (!wccflag) 1841 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1842 /* 1843 * Kludge City: If the first reply to the remove rpc is lost.. 1844 * the reply to the retransmitted request will be ENOENT 1845 * since the file was in fact removed 1846 * Therefore, we cheat and return success. 1847 */ 1848 if (rexmit && error == ENOENT) 1849 error = 0; 1850 return (error); 1851 } 1852 1853 /* 1854 * nfs file rename call 1855 */ 1856 int 1857 nfs_rename(void *v) 1858 { 1859 struct vop_rename_args /* { 1860 struct vnode *a_fdvp; 1861 struct vnode *a_fvp; 1862 struct componentname *a_fcnp; 1863 struct vnode *a_tdvp; 1864 struct vnode *a_tvp; 1865 struct componentname *a_tcnp; 1866 } */ *ap = v; 1867 struct vnode *fvp = ap->a_fvp; 1868 struct vnode *tvp = ap->a_tvp; 1869 struct vnode *fdvp = ap->a_fdvp; 1870 struct vnode *tdvp = ap->a_tdvp; 1871 struct componentname *tcnp = ap->a_tcnp; 1872 struct componentname *fcnp = ap->a_fcnp; 1873 int error; 1874 1875 /* Check for cross-device rename */ 1876 if ((fvp->v_mount != tdvp->v_mount) || 1877 (tvp && (fvp->v_mount != tvp->v_mount))) { 1878 error = EXDEV; 1879 goto out; 1880 } 1881 1882 /* 1883 * If the tvp exists and is in use, sillyrename it before doing the 1884 * rename of the new file over it. 1885 * 1886 * Have sillyrename use link instead of rename if possible, 1887 * so that we don't lose the file if the rename fails, and so 1888 * that there's no window when the "to" file doesn't exist. 1889 */ 1890 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1891 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1892 VN_KNOTE(tvp, NOTE_DELETE); 1893 vput(tvp); 1894 tvp = NULL; 1895 } 1896 1897 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1898 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1899 curlwp); 1900 1901 VN_KNOTE(fdvp, NOTE_WRITE); 1902 VN_KNOTE(tdvp, NOTE_WRITE); 1903 if (error == 0 || error == EEXIST) { 1904 if (fvp->v_type == VDIR) 1905 cache_purge(fvp); 1906 else 1907 cache_purge1(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1908 0); 1909 if (tvp != NULL && tvp->v_type == VDIR) 1910 cache_purge(tvp); 1911 else 1912 cache_purge1(tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, 1913 0); 1914 } 1915 out: 1916 if (tdvp == tvp) 1917 vrele(tdvp); 1918 else 1919 vput(tdvp); 1920 if (tvp) 1921 vput(tvp); 1922 vrele(fdvp); 1923 vrele(fvp); 1924 return (error); 1925 } 1926 1927 /* 1928 * nfs file rename rpc called from nfs_remove() above 1929 */ 1930 int 1931 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp) 1932 { 1933 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1934 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 1935 } 1936 1937 /* 1938 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1939 */ 1940 int 1941 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, struct vnode *tdvp, const char *tnameptr, int tnamelen, kauth_cred_t cred, struct lwp *l) 1942 { 1943 u_int32_t *tl; 1944 char *cp; 1945 #ifndef NFS_V2_ONLY 1946 int32_t t1; 1947 char *cp2; 1948 #endif 1949 int32_t t2; 1950 char *bpos, *dpos; 1951 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1952 struct mbuf *mreq, *mrep, *md, *mb; 1953 const int v3 = NFS_ISV3(fdvp); 1954 int rexmit = 0; 1955 struct nfsnode *fdnp = VTONFS(fdvp); 1956 1957 nfsstats.rpccnt[NFSPROC_RENAME]++; 1958 nfsm_reqhead(fdnp, NFSPROC_RENAME, 1959 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1960 nfsm_rndup(tnamelen)); 1961 nfsm_fhtom(fdnp, v3); 1962 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1963 nfsm_fhtom(VTONFS(tdvp), v3); 1964 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1965 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 1966 #ifndef NFS_V2_ONLY 1967 if (v3) { 1968 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 1969 nfsm_wcc_data(tdvp, twccflag, 0, !error); 1970 } 1971 #endif 1972 nfsm_reqdone; 1973 VTONFS(fdvp)->n_flag |= NMODIFIED; 1974 VTONFS(tdvp)->n_flag |= NMODIFIED; 1975 if (!fwccflag) 1976 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 1977 if (!twccflag) 1978 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 1979 /* 1980 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1981 */ 1982 if (rexmit && error == ENOENT) 1983 error = 0; 1984 return (error); 1985 } 1986 1987 /* 1988 * NFS link RPC, called from nfs_link. 1989 * Assumes dvp and vp locked, and leaves them that way. 1990 */ 1991 1992 static int 1993 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 1994 size_t namelen, kauth_cred_t cred, struct lwp *l) 1995 { 1996 u_int32_t *tl; 1997 char *cp; 1998 #ifndef NFS_V2_ONLY 1999 int32_t t1; 2000 char *cp2; 2001 #endif 2002 int32_t t2; 2003 char *bpos, *dpos; 2004 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2005 struct mbuf *mreq, *mrep, *md, *mb; 2006 const int v3 = NFS_ISV3(dvp); 2007 int rexmit = 0; 2008 struct nfsnode *np = VTONFS(vp); 2009 2010 nfsstats.rpccnt[NFSPROC_LINK]++; 2011 nfsm_reqhead(np, NFSPROC_LINK, 2012 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 2013 nfsm_fhtom(np, v3); 2014 nfsm_fhtom(VTONFS(dvp), v3); 2015 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 2016 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 2017 #ifndef NFS_V2_ONLY 2018 if (v3) { 2019 nfsm_postop_attr(vp, attrflag, 0); 2020 nfsm_wcc_data(dvp, wccflag, 0, !error); 2021 } 2022 #endif 2023 nfsm_reqdone; 2024 2025 VTONFS(dvp)->n_flag |= NMODIFIED; 2026 if (!attrflag) 2027 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 2028 if (!wccflag) 2029 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2030 2031 /* 2032 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2033 */ 2034 if (rexmit && error == EEXIST) 2035 error = 0; 2036 2037 return error; 2038 } 2039 2040 /* 2041 * nfs hard link create call 2042 */ 2043 int 2044 nfs_link(void *v) 2045 { 2046 struct vop_link_v2_args /* { 2047 struct vnode *a_dvp; 2048 struct vnode *a_vp; 2049 struct componentname *a_cnp; 2050 } */ *ap = v; 2051 struct vnode *vp = ap->a_vp; 2052 struct vnode *dvp = ap->a_dvp; 2053 struct componentname *cnp = ap->a_cnp; 2054 int error = 0; 2055 2056 error = vn_lock(vp, LK_EXCLUSIVE); 2057 if (error != 0) { 2058 VOP_ABORTOP(dvp, cnp); 2059 return error; 2060 } 2061 2062 /* 2063 * Push all writes to the server, so that the attribute cache 2064 * doesn't get "out of sync" with the server. 2065 * XXX There should be a better way! 2066 */ 2067 VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0); 2068 2069 error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2070 cnp->cn_cred, curlwp); 2071 2072 if (error == 0) { 2073 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2074 } 2075 VOP_UNLOCK(vp); 2076 VN_KNOTE(vp, NOTE_LINK); 2077 VN_KNOTE(dvp, NOTE_WRITE); 2078 return (error); 2079 } 2080 2081 /* 2082 * nfs symbolic link create call 2083 */ 2084 int 2085 nfs_symlink(void *v) 2086 { 2087 struct vop_symlink_v3_args /* { 2088 struct vnode *a_dvp; 2089 struct vnode **a_vpp; 2090 struct componentname *a_cnp; 2091 struct vattr *a_vap; 2092 char *a_target; 2093 } */ *ap = v; 2094 struct vnode *dvp = ap->a_dvp; 2095 struct vattr *vap = ap->a_vap; 2096 struct componentname *cnp = ap->a_cnp; 2097 struct nfsv2_sattr *sp; 2098 u_int32_t *tl; 2099 char *cp; 2100 int32_t t1, t2; 2101 char *bpos, *dpos, *cp2; 2102 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2103 struct mbuf *mreq, *mrep, *md, *mb; 2104 struct vnode *newvp = (struct vnode *)0; 2105 const int v3 = NFS_ISV3(dvp); 2106 int rexmit = 0; 2107 struct nfsnode *dnp = VTONFS(dvp); 2108 2109 *ap->a_vpp = NULL; 2110 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2111 slen = strlen(ap->a_target); 2112 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2113 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2114 nfsm_fhtom(dnp, v3); 2115 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2116 #ifndef NFS_V2_ONlY 2117 if (v3) 2118 nfsm_v3attrbuild(vap, false); 2119 #endif 2120 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2121 #ifndef NFS_V2_ONlY 2122 if (!v3) { 2123 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2124 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2125 sp->sa_uid = nfs_xdrneg1; 2126 sp->sa_gid = nfs_xdrneg1; 2127 sp->sa_size = nfs_xdrneg1; 2128 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2129 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2130 } 2131 #endif 2132 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2133 &rexmit); 2134 #ifndef NFS_V2_ONlY 2135 if (v3) { 2136 if (!error) 2137 nfsm_mtofh(dvp, newvp, v3, gotvp); 2138 nfsm_wcc_data(dvp, wccflag, 0, !error); 2139 } 2140 #endif 2141 nfsm_reqdone; 2142 /* 2143 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2144 */ 2145 if (rexmit && error == EEXIST) 2146 error = 0; 2147 if (error == 0 || error == EEXIST) 2148 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2149 if (error == 0 && newvp == NULL) { 2150 struct nfsnode *np = NULL; 2151 2152 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2153 cnp->cn_cred, curlwp, &np); 2154 if (error == 0) 2155 newvp = NFSTOV(np); 2156 } 2157 if (error) { 2158 if (newvp != NULL) 2159 vput(newvp); 2160 } else { 2161 *ap->a_vpp = newvp; 2162 VOP_UNLOCK(newvp); 2163 } 2164 VTONFS(dvp)->n_flag |= NMODIFIED; 2165 if (!wccflag) 2166 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2167 VN_KNOTE(dvp, NOTE_WRITE); 2168 return (error); 2169 } 2170 2171 /* 2172 * nfs make dir call 2173 */ 2174 int 2175 nfs_mkdir(void *v) 2176 { 2177 struct vop_mkdir_v3_args /* { 2178 struct vnode *a_dvp; 2179 struct vnode **a_vpp; 2180 struct componentname *a_cnp; 2181 struct vattr *a_vap; 2182 } */ *ap = v; 2183 struct vnode *dvp = ap->a_dvp; 2184 struct vattr *vap = ap->a_vap; 2185 struct componentname *cnp = ap->a_cnp; 2186 struct nfsv2_sattr *sp; 2187 u_int32_t *tl; 2188 char *cp; 2189 int32_t t1, t2; 2190 int len; 2191 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2192 struct vnode *newvp = (struct vnode *)0; 2193 char *bpos, *dpos, *cp2; 2194 int error = 0, wccflag = NFSV3_WCCRATTR; 2195 int gotvp = 0; 2196 int rexmit = 0; 2197 struct mbuf *mreq, *mrep, *md, *mb; 2198 const int v3 = NFS_ISV3(dvp); 2199 2200 len = cnp->cn_namelen; 2201 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2202 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2203 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2204 nfsm_fhtom(dnp, v3); 2205 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2206 #ifndef NFS_V2_ONLY 2207 if (v3) { 2208 nfsm_v3attrbuild(vap, false); 2209 } else 2210 #endif 2211 { 2212 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2213 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2214 sp->sa_uid = nfs_xdrneg1; 2215 sp->sa_gid = nfs_xdrneg1; 2216 sp->sa_size = nfs_xdrneg1; 2217 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2218 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2219 } 2220 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2221 if (!error) 2222 nfsm_mtofh(dvp, newvp, v3, gotvp); 2223 if (v3) 2224 nfsm_wcc_data(dvp, wccflag, 0, !error); 2225 nfsm_reqdone; 2226 VTONFS(dvp)->n_flag |= NMODIFIED; 2227 if (!wccflag) 2228 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2229 /* 2230 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2231 * if we can succeed in looking up the directory. 2232 */ 2233 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2234 if (newvp) { 2235 vput(newvp); 2236 newvp = (struct vnode *)0; 2237 } 2238 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2239 curlwp, &np); 2240 if (!error) { 2241 newvp = NFSTOV(np); 2242 if (newvp->v_type != VDIR || newvp == dvp) 2243 error = EEXIST; 2244 } 2245 } 2246 if (error) { 2247 if (newvp) { 2248 if (dvp != newvp) 2249 vput(newvp); 2250 else 2251 vrele(newvp); 2252 } 2253 } else { 2254 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2255 nfs_cache_enter(dvp, newvp, cnp); 2256 *ap->a_vpp = newvp; 2257 VOP_UNLOCK(newvp); 2258 } 2259 return (error); 2260 } 2261 2262 /* 2263 * nfs remove directory call 2264 */ 2265 int 2266 nfs_rmdir(void *v) 2267 { 2268 struct vop_rmdir_args /* { 2269 struct vnode *a_dvp; 2270 struct vnode *a_vp; 2271 struct componentname *a_cnp; 2272 } */ *ap = v; 2273 struct vnode *vp = ap->a_vp; 2274 struct vnode *dvp = ap->a_dvp; 2275 struct componentname *cnp = ap->a_cnp; 2276 u_int32_t *tl; 2277 char *cp; 2278 #ifndef NFS_V2_ONLY 2279 int32_t t1; 2280 char *cp2; 2281 #endif 2282 int32_t t2; 2283 char *bpos, *dpos; 2284 int error = 0, wccflag = NFSV3_WCCRATTR; 2285 int rexmit = 0; 2286 struct mbuf *mreq, *mrep, *md, *mb; 2287 const int v3 = NFS_ISV3(dvp); 2288 struct nfsnode *dnp; 2289 2290 if (dvp == vp) { 2291 vrele(dvp); 2292 vput(dvp); 2293 return (EINVAL); 2294 } 2295 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2296 dnp = VTONFS(dvp); 2297 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2298 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2299 nfsm_fhtom(dnp, v3); 2300 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2301 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2302 #ifndef NFS_V2_ONLY 2303 if (v3) 2304 nfsm_wcc_data(dvp, wccflag, 0, !error); 2305 #endif 2306 nfsm_reqdone; 2307 VTONFS(dvp)->n_flag |= NMODIFIED; 2308 if (!wccflag) 2309 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2310 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2311 VN_KNOTE(vp, NOTE_DELETE); 2312 cache_purge(vp); 2313 vput(vp); 2314 vput(dvp); 2315 /* 2316 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2317 */ 2318 if (rexmit && error == ENOENT) 2319 error = 0; 2320 return (error); 2321 } 2322 2323 /* 2324 * nfs readdir call 2325 */ 2326 int 2327 nfs_readdir(void *v) 2328 { 2329 struct vop_readdir_args /* { 2330 struct vnode *a_vp; 2331 struct uio *a_uio; 2332 kauth_cred_t a_cred; 2333 int *a_eofflag; 2334 off_t **a_cookies; 2335 int *a_ncookies; 2336 } */ *ap = v; 2337 struct vnode *vp = ap->a_vp; 2338 struct uio *uio = ap->a_uio; 2339 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2340 char *base = uio->uio_iov->iov_base; 2341 int tresid, error; 2342 size_t count, lost; 2343 struct dirent *dp; 2344 off_t *cookies = NULL; 2345 int ncookies = 0, nc; 2346 2347 if (vp->v_type != VDIR) 2348 return (EPERM); 2349 2350 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2351 count = uio->uio_resid - lost; 2352 if (count <= 0) 2353 return (EINVAL); 2354 2355 /* 2356 * Call nfs_bioread() to do the real work. 2357 */ 2358 tresid = uio->uio_resid = count; 2359 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2360 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2361 2362 if (!error && ap->a_cookies) { 2363 ncookies = count / 16; 2364 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2365 *ap->a_cookies = cookies; 2366 } 2367 2368 if (!error && uio->uio_resid == tresid) { 2369 uio->uio_resid += lost; 2370 nfsstats.direofcache_misses++; 2371 if (ap->a_cookies) 2372 *ap->a_ncookies = 0; 2373 *ap->a_eofflag = 1; 2374 return (0); 2375 } 2376 2377 if (!error && ap->a_cookies) { 2378 /* 2379 * Only the NFS server and emulations use cookies, and they 2380 * load the directory block into system space, so we can 2381 * just look at it directly. 2382 */ 2383 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2384 uio->uio_iovcnt != 1) 2385 panic("nfs_readdir: lost in space"); 2386 for (nc = 0; ncookies-- && 2387 base < (char *)uio->uio_iov->iov_base; nc++){ 2388 dp = (struct dirent *) base; 2389 if (dp->d_reclen == 0) 2390 break; 2391 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2392 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2393 else 2394 *(cookies++) = NFS_GETCOOKIE(dp); 2395 base += dp->d_reclen; 2396 } 2397 uio->uio_resid += 2398 ((char *)uio->uio_iov->iov_base - base); 2399 uio->uio_iov->iov_len += 2400 ((char *)uio->uio_iov->iov_base - base); 2401 uio->uio_iov->iov_base = base; 2402 *ap->a_ncookies = nc; 2403 } 2404 2405 uio->uio_resid += lost; 2406 *ap->a_eofflag = 0; 2407 return (error); 2408 } 2409 2410 /* 2411 * Readdir rpc call. 2412 * Called from below the buffer cache by nfs_doio(). 2413 */ 2414 int 2415 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2416 { 2417 int len, left; 2418 struct dirent *dp = NULL; 2419 u_int32_t *tl; 2420 char *cp; 2421 int32_t t1, t2; 2422 char *bpos, *dpos, *cp2; 2423 struct mbuf *mreq, *mrep, *md, *mb; 2424 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2425 struct nfsnode *dnp = VTONFS(vp); 2426 u_quad_t fileno; 2427 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2428 #ifndef NFS_V2_ONLY 2429 int attrflag; 2430 #endif 2431 int nrpcs = 0, reclen; 2432 const int v3 = NFS_ISV3(vp); 2433 2434 #ifdef DIAGNOSTIC 2435 /* 2436 * Should be called from buffer cache, so only amount of 2437 * NFS_DIRBLKSIZ will be requested. 2438 */ 2439 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2440 panic("nfs readdirrpc bad uio"); 2441 #endif 2442 2443 /* 2444 * Loop around doing readdir rpc's of size nm_readdirsize 2445 * truncated to a multiple of NFS_DIRFRAGSIZ. 2446 * The stopping criteria is EOF or buffer full. 2447 */ 2448 while (more_dirs && bigenough) { 2449 /* 2450 * Heuristic: don't bother to do another RPC to further 2451 * fill up this block if there is not much room left. (< 50% 2452 * of the readdir RPC size). This wastes some buffer space 2453 * but can save up to 50% in RPC calls. 2454 */ 2455 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2456 bigenough = 0; 2457 break; 2458 } 2459 nfsstats.rpccnt[NFSPROC_READDIR]++; 2460 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2461 NFSX_READDIR(v3)); 2462 nfsm_fhtom(dnp, v3); 2463 #ifndef NFS_V2_ONLY 2464 if (v3) { 2465 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2466 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2467 txdr_swapcookie3(uiop->uio_offset, tl); 2468 } else { 2469 txdr_cookie3(uiop->uio_offset, tl); 2470 } 2471 tl += 2; 2472 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2473 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2474 } else 2475 #endif 2476 { 2477 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2478 *tl++ = txdr_unsigned(uiop->uio_offset); 2479 } 2480 *tl = txdr_unsigned(nmp->nm_readdirsize); 2481 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2482 nrpcs++; 2483 #ifndef NFS_V2_ONLY 2484 if (v3) { 2485 nfsm_postop_attr(vp, attrflag, 0); 2486 if (!error) { 2487 nfsm_dissect(tl, u_int32_t *, 2488 2 * NFSX_UNSIGNED); 2489 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2490 dnp->n_cookieverf.nfsuquad[1] = *tl; 2491 } else { 2492 m_freem(mrep); 2493 goto nfsmout; 2494 } 2495 } 2496 #endif 2497 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2498 more_dirs = fxdr_unsigned(int, *tl); 2499 2500 /* loop thru the dir entries, doctoring them to 4bsd form */ 2501 while (more_dirs && bigenough) { 2502 #ifndef NFS_V2_ONLY 2503 if (v3) { 2504 nfsm_dissect(tl, u_int32_t *, 2505 3 * NFSX_UNSIGNED); 2506 fileno = fxdr_hyper(tl); 2507 len = fxdr_unsigned(int, *(tl + 2)); 2508 } else 2509 #endif 2510 { 2511 nfsm_dissect(tl, u_int32_t *, 2512 2 * NFSX_UNSIGNED); 2513 fileno = fxdr_unsigned(u_quad_t, *tl++); 2514 len = fxdr_unsigned(int, *tl); 2515 } 2516 if (len <= 0 || len > NFS_MAXNAMLEN) { 2517 error = EBADRPC; 2518 m_freem(mrep); 2519 goto nfsmout; 2520 } 2521 /* for cookie stashing */ 2522 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2523 left = NFS_DIRFRAGSIZ - blksiz; 2524 if (reclen > left) { 2525 memset(uiop->uio_iov->iov_base, 0, left); 2526 dp->d_reclen += left; 2527 UIO_ADVANCE(uiop, left); 2528 blksiz = 0; 2529 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2530 } 2531 if (reclen > uiop->uio_resid) 2532 bigenough = 0; 2533 if (bigenough) { 2534 int tlen; 2535 2536 dp = (struct dirent *)uiop->uio_iov->iov_base; 2537 dp->d_fileno = fileno; 2538 dp->d_namlen = len; 2539 dp->d_reclen = reclen; 2540 dp->d_type = DT_UNKNOWN; 2541 blksiz += reclen; 2542 if (blksiz == NFS_DIRFRAGSIZ) 2543 blksiz = 0; 2544 UIO_ADVANCE(uiop, DIRHDSIZ); 2545 nfsm_mtouio(uiop, len); 2546 tlen = reclen - (DIRHDSIZ + len); 2547 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2548 UIO_ADVANCE(uiop, tlen); 2549 } else 2550 nfsm_adv(nfsm_rndup(len)); 2551 #ifndef NFS_V2_ONLY 2552 if (v3) { 2553 nfsm_dissect(tl, u_int32_t *, 2554 3 * NFSX_UNSIGNED); 2555 } else 2556 #endif 2557 { 2558 nfsm_dissect(tl, u_int32_t *, 2559 2 * NFSX_UNSIGNED); 2560 } 2561 if (bigenough) { 2562 #ifndef NFS_V2_ONLY 2563 if (v3) { 2564 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2565 uiop->uio_offset = 2566 fxdr_swapcookie3(tl); 2567 else 2568 uiop->uio_offset = 2569 fxdr_cookie3(tl); 2570 } 2571 else 2572 #endif 2573 { 2574 uiop->uio_offset = 2575 fxdr_unsigned(off_t, *tl); 2576 } 2577 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2578 } 2579 if (v3) 2580 tl += 2; 2581 else 2582 tl++; 2583 more_dirs = fxdr_unsigned(int, *tl); 2584 } 2585 /* 2586 * If at end of rpc data, get the eof boolean 2587 */ 2588 if (!more_dirs) { 2589 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2590 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2591 2592 /* 2593 * kludge: if we got no entries, treat it as EOF. 2594 * some server sometimes send a reply without any 2595 * entries or EOF. 2596 * although it might mean the server has very long name, 2597 * we can't handle such entries anyway. 2598 */ 2599 2600 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2601 more_dirs = 0; 2602 } 2603 m_freem(mrep); 2604 } 2605 /* 2606 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2607 * by increasing d_reclen for the last record. 2608 */ 2609 if (blksiz > 0) { 2610 left = NFS_DIRFRAGSIZ - blksiz; 2611 memset(uiop->uio_iov->iov_base, 0, left); 2612 dp->d_reclen += left; 2613 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2614 UIO_ADVANCE(uiop, left); 2615 } 2616 2617 /* 2618 * We are now either at the end of the directory or have filled the 2619 * block. 2620 */ 2621 if (bigenough) { 2622 dnp->n_direofoffset = uiop->uio_offset; 2623 dnp->n_flag |= NEOFVALID; 2624 } 2625 nfsmout: 2626 return (error); 2627 } 2628 2629 #ifndef NFS_V2_ONLY 2630 /* 2631 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2632 */ 2633 int 2634 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2635 { 2636 int len, left; 2637 struct dirent *dp = NULL; 2638 u_int32_t *tl; 2639 char *cp; 2640 int32_t t1, t2; 2641 struct vnode *newvp; 2642 char *bpos, *dpos, *cp2; 2643 struct mbuf *mreq, *mrep, *md, *mb; 2644 struct nameidata nami, *ndp = &nami; 2645 struct componentname *cnp = &ndp->ni_cnd; 2646 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2647 struct nfsnode *dnp = VTONFS(vp), *np; 2648 nfsfh_t *fhp; 2649 u_quad_t fileno; 2650 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2651 int attrflag, fhsize, nrpcs = 0, reclen; 2652 struct nfs_fattr fattr, *fp; 2653 2654 #ifdef DIAGNOSTIC 2655 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2656 panic("nfs readdirplusrpc bad uio"); 2657 #endif 2658 ndp->ni_dvp = vp; 2659 newvp = NULLVP; 2660 2661 /* 2662 * Loop around doing readdir rpc's of size nm_readdirsize 2663 * truncated to a multiple of NFS_DIRFRAGSIZ. 2664 * The stopping criteria is EOF or buffer full. 2665 */ 2666 while (more_dirs && bigenough) { 2667 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2668 bigenough = 0; 2669 break; 2670 } 2671 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2672 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2673 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2674 nfsm_fhtom(dnp, 1); 2675 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2676 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2677 txdr_swapcookie3(uiop->uio_offset, tl); 2678 } else { 2679 txdr_cookie3(uiop->uio_offset, tl); 2680 } 2681 tl += 2; 2682 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2683 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2684 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2685 *tl = txdr_unsigned(nmp->nm_rsize); 2686 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2687 nfsm_postop_attr(vp, attrflag, 0); 2688 if (error) { 2689 m_freem(mrep); 2690 goto nfsmout; 2691 } 2692 nrpcs++; 2693 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2694 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2695 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2696 more_dirs = fxdr_unsigned(int, *tl); 2697 2698 /* loop thru the dir entries, doctoring them to 4bsd form */ 2699 while (more_dirs && bigenough) { 2700 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2701 fileno = fxdr_hyper(tl); 2702 len = fxdr_unsigned(int, *(tl + 2)); 2703 if (len <= 0 || len > NFS_MAXNAMLEN) { 2704 error = EBADRPC; 2705 m_freem(mrep); 2706 goto nfsmout; 2707 } 2708 /* for cookie stashing */ 2709 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2710 left = NFS_DIRFRAGSIZ - blksiz; 2711 if (reclen > left) { 2712 /* 2713 * DIRFRAGSIZ is aligned, no need to align 2714 * again here. 2715 */ 2716 memset(uiop->uio_iov->iov_base, 0, left); 2717 dp->d_reclen += left; 2718 UIO_ADVANCE(uiop, left); 2719 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2720 blksiz = 0; 2721 } 2722 if (reclen > uiop->uio_resid) 2723 bigenough = 0; 2724 if (bigenough) { 2725 int tlen; 2726 2727 dp = (struct dirent *)uiop->uio_iov->iov_base; 2728 dp->d_fileno = fileno; 2729 dp->d_namlen = len; 2730 dp->d_reclen = reclen; 2731 dp->d_type = DT_UNKNOWN; 2732 blksiz += reclen; 2733 if (blksiz == NFS_DIRFRAGSIZ) 2734 blksiz = 0; 2735 UIO_ADVANCE(uiop, DIRHDSIZ); 2736 nfsm_mtouio(uiop, len); 2737 tlen = reclen - (DIRHDSIZ + len); 2738 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2739 UIO_ADVANCE(uiop, tlen); 2740 cnp->cn_nameptr = dp->d_name; 2741 cnp->cn_namelen = dp->d_namlen; 2742 } else 2743 nfsm_adv(nfsm_rndup(len)); 2744 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2745 if (bigenough) { 2746 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2747 uiop->uio_offset = 2748 fxdr_swapcookie3(tl); 2749 else 2750 uiop->uio_offset = 2751 fxdr_cookie3(tl); 2752 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2753 } 2754 tl += 2; 2755 2756 /* 2757 * Since the attributes are before the file handle 2758 * (sigh), we must skip over the attributes and then 2759 * come back and get them. 2760 */ 2761 attrflag = fxdr_unsigned(int, *tl); 2762 if (attrflag) { 2763 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2764 memcpy(&fattr, fp, NFSX_V3FATTR); 2765 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2766 doit = fxdr_unsigned(int, *tl); 2767 if (doit) { 2768 nfsm_getfh(fhp, fhsize, 1); 2769 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2770 vref(vp); 2771 newvp = vp; 2772 np = dnp; 2773 } else { 2774 error = nfs_nget1(vp->v_mount, fhp, 2775 fhsize, &np, LK_NOWAIT); 2776 if (!error) 2777 newvp = NFSTOV(np); 2778 } 2779 if (!error) { 2780 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2781 if (bigenough) { 2782 dp->d_type = 2783 IFTODT(VTTOIF(np->n_vattr->va_type)); 2784 if (cnp->cn_namelen <= NCHNAMLEN) { 2785 ndp->ni_vp = newvp; 2786 nfs_cache_enter(ndp->ni_dvp, 2787 ndp->ni_vp, cnp); 2788 } 2789 } 2790 } 2791 error = 0; 2792 } 2793 } else { 2794 /* Just skip over the file handle */ 2795 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2796 i = fxdr_unsigned(int, *tl); 2797 nfsm_adv(nfsm_rndup(i)); 2798 } 2799 if (newvp != NULLVP) { 2800 if (newvp == vp) 2801 vrele(newvp); 2802 else 2803 vput(newvp); 2804 newvp = NULLVP; 2805 } 2806 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2807 more_dirs = fxdr_unsigned(int, *tl); 2808 } 2809 /* 2810 * If at end of rpc data, get the eof boolean 2811 */ 2812 if (!more_dirs) { 2813 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2814 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2815 2816 /* 2817 * kludge: see a comment in nfs_readdirrpc. 2818 */ 2819 2820 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2821 more_dirs = 0; 2822 } 2823 m_freem(mrep); 2824 } 2825 /* 2826 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2827 * by increasing d_reclen for the last record. 2828 */ 2829 if (blksiz > 0) { 2830 left = NFS_DIRFRAGSIZ - blksiz; 2831 memset(uiop->uio_iov->iov_base, 0, left); 2832 dp->d_reclen += left; 2833 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2834 UIO_ADVANCE(uiop, left); 2835 } 2836 2837 /* 2838 * We are now either at the end of the directory or have filled the 2839 * block. 2840 */ 2841 if (bigenough) { 2842 dnp->n_direofoffset = uiop->uio_offset; 2843 dnp->n_flag |= NEOFVALID; 2844 } 2845 nfsmout: 2846 if (newvp != NULLVP) { 2847 if(newvp == vp) 2848 vrele(newvp); 2849 else 2850 vput(newvp); 2851 } 2852 return (error); 2853 } 2854 #endif 2855 2856 /* 2857 * Silly rename. To make the NFS filesystem that is stateless look a little 2858 * more like the "ufs" a remove of an active vnode is translated to a rename 2859 * to a funny looking filename that is removed by nfs_inactive on the 2860 * nfsnode. There is the potential for another process on a different client 2861 * to create the same funny name between the nfs_lookitup() fails and the 2862 * nfs_rename() completes, but... 2863 */ 2864 int 2865 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink) 2866 { 2867 struct sillyrename *sp; 2868 struct nfsnode *np; 2869 int error; 2870 pid_t pid; 2871 2872 cache_purge(dvp); 2873 np = VTONFS(vp); 2874 #ifndef DIAGNOSTIC 2875 if (vp->v_type == VDIR) 2876 panic("nfs: sillyrename dir"); 2877 #endif 2878 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2879 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2880 sp->s_dvp = dvp; 2881 vref(dvp); 2882 2883 /* Fudge together a funny name */ 2884 pid = curlwp->l_proc->p_pid; 2885 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 2886 sp->s_namlen = 12; 2887 sp->s_name[8] = hexdigits[pid & 0xf]; 2888 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 2889 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 2890 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 2891 2892 /* Try lookitups until we get one that isn't there */ 2893 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2894 curlwp, (struct nfsnode **)0) == 0) { 2895 sp->s_name[4]++; 2896 if (sp->s_name[4] > 'z') { 2897 error = EINVAL; 2898 goto bad; 2899 } 2900 } 2901 if (dolink) { 2902 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 2903 sp->s_cred, curlwp); 2904 /* 2905 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 2906 */ 2907 if (error == ENOTSUP) { 2908 error = nfs_renameit(dvp, cnp, sp); 2909 } 2910 } else { 2911 error = nfs_renameit(dvp, cnp, sp); 2912 } 2913 if (error) 2914 goto bad; 2915 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2916 curlwp, &np); 2917 np->n_sillyrename = sp; 2918 return (0); 2919 bad: 2920 vrele(sp->s_dvp); 2921 kauth_cred_free(sp->s_cred); 2922 kmem_free(sp, sizeof(*sp)); 2923 return (error); 2924 } 2925 2926 /* 2927 * Look up a file name and optionally either update the file handle or 2928 * allocate an nfsnode, depending on the value of npp. 2929 * npp == NULL --> just do the lookup 2930 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2931 * handled too 2932 * *npp != NULL --> update the file handle in the vnode 2933 */ 2934 int 2935 nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp) 2936 { 2937 u_int32_t *tl; 2938 char *cp; 2939 int32_t t1, t2; 2940 struct vnode *newvp = (struct vnode *)0; 2941 struct nfsnode *np, *dnp = VTONFS(dvp); 2942 char *bpos, *dpos, *cp2; 2943 int error = 0, ofhlen, fhlen; 2944 #ifndef NFS_V2_ONLY 2945 int attrflag; 2946 #endif 2947 struct mbuf *mreq, *mrep, *md, *mb; 2948 nfsfh_t *ofhp, *nfhp; 2949 const int v3 = NFS_ISV3(dvp); 2950 2951 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2952 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 2953 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2954 nfsm_fhtom(dnp, v3); 2955 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2956 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 2957 if (npp && !error) { 2958 nfsm_getfh(nfhp, fhlen, v3); 2959 if (*npp) { 2960 np = *npp; 2961 newvp = NFSTOV(np); 2962 ofhlen = np->n_fhsize; 2963 ofhp = kmem_alloc(ofhlen, KM_SLEEP); 2964 memcpy(ofhp, np->n_fhp, ofhlen); 2965 error = vcache_rekey_enter(newvp->v_mount, newvp, 2966 ofhp, ofhlen, nfhp, fhlen); 2967 if (error) { 2968 kmem_free(ofhp, ofhlen); 2969 m_freem(mrep); 2970 return error; 2971 } 2972 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2973 kmem_free(np->n_fhp, np->n_fhsize); 2974 np->n_fhp = &np->n_fh; 2975 } 2976 #if NFS_SMALLFH < NFSX_V3FHMAX 2977 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 2978 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 2979 #endif 2980 memcpy(np->n_fhp, nfhp, fhlen); 2981 np->n_fhsize = fhlen; 2982 vcache_rekey_exit(newvp->v_mount, newvp, 2983 ofhp, ofhlen, np->n_fhp, fhlen); 2984 kmem_free(ofhp, ofhlen); 2985 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2986 vref(dvp); 2987 newvp = dvp; 2988 np = dnp; 2989 } else { 2990 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2991 if (error) { 2992 m_freem(mrep); 2993 return (error); 2994 } 2995 newvp = NFSTOV(np); 2996 } 2997 #ifndef NFS_V2_ONLY 2998 if (v3) { 2999 nfsm_postop_attr(newvp, attrflag, 0); 3000 if (!attrflag && *npp == NULL) { 3001 m_freem(mrep); 3002 vput(newvp); 3003 return (ENOENT); 3004 } 3005 } else 3006 #endif 3007 nfsm_loadattr(newvp, (struct vattr *)0, 0); 3008 } 3009 nfsm_reqdone; 3010 if (npp && *npp == NULL) { 3011 if (error) { 3012 if (newvp) 3013 vput(newvp); 3014 } else 3015 *npp = np; 3016 } 3017 return (error); 3018 } 3019 3020 #ifndef NFS_V2_ONLY 3021 /* 3022 * Nfs Version 3 commit rpc 3023 */ 3024 int 3025 nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l) 3026 { 3027 char *cp; 3028 u_int32_t *tl; 3029 int32_t t1, t2; 3030 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3031 char *bpos, *dpos, *cp2; 3032 int error = 0, wccflag = NFSV3_WCCRATTR; 3033 struct mbuf *mreq, *mrep, *md, *mb; 3034 struct nfsnode *np; 3035 3036 KASSERT(NFS_ISV3(vp)); 3037 3038 #ifdef NFS_DEBUG_COMMIT 3039 printf("commit %lu - %lu\n", (unsigned long)offset, 3040 (unsigned long)(offset + cnt)); 3041 #endif 3042 3043 mutex_enter(&nmp->nm_lock); 3044 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 3045 mutex_exit(&nmp->nm_lock); 3046 return (0); 3047 } 3048 mutex_exit(&nmp->nm_lock); 3049 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3050 np = VTONFS(vp); 3051 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 3052 nfsm_fhtom(np, 1); 3053 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 3054 txdr_hyper(offset, tl); 3055 tl += 2; 3056 *tl = txdr_unsigned(cnt); 3057 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3058 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3059 if (!error) { 3060 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3061 mutex_enter(&nmp->nm_lock); 3062 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3063 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3064 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3065 error = NFSERR_STALEWRITEVERF; 3066 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3067 } 3068 mutex_exit(&nmp->nm_lock); 3069 } 3070 nfsm_reqdone; 3071 return (error); 3072 } 3073 #endif 3074 3075 /* 3076 * Kludge City.. 3077 * - make nfs_bmap() essentially a no-op that does no translation 3078 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3079 * (Maybe I could use the process's page mapping, but I was concerned that 3080 * Kernel Write might not be enabled and also figured copyout() would do 3081 * a lot more work than memcpy() and also it currently happens in the 3082 * context of the swapper process (2). 3083 */ 3084 int 3085 nfs_bmap(void *v) 3086 { 3087 struct vop_bmap_args /* { 3088 struct vnode *a_vp; 3089 daddr_t a_bn; 3090 struct vnode **a_vpp; 3091 daddr_t *a_bnp; 3092 int *a_runp; 3093 } */ *ap = v; 3094 struct vnode *vp = ap->a_vp; 3095 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3096 3097 if (ap->a_vpp != NULL) 3098 *ap->a_vpp = vp; 3099 if (ap->a_bnp != NULL) 3100 *ap->a_bnp = ap->a_bn << bshift; 3101 if (ap->a_runp != NULL) 3102 *ap->a_runp = 1024 * 1024; /* XXX */ 3103 return (0); 3104 } 3105 3106 /* 3107 * Strategy routine. 3108 * For async requests when nfsiod(s) are running, queue the request by 3109 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3110 * request. 3111 */ 3112 int 3113 nfs_strategy(void *v) 3114 { 3115 struct vop_strategy_args *ap = v; 3116 struct buf *bp = ap->a_bp; 3117 int error = 0; 3118 3119 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3120 panic("nfs physio/async"); 3121 3122 /* 3123 * If the op is asynchronous and an i/o daemon is waiting 3124 * queue the request, wake it up and wait for completion 3125 * otherwise just do it ourselves. 3126 */ 3127 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3128 error = nfs_doio(bp); 3129 return (error); 3130 } 3131 3132 /* 3133 * fsync vnode op. Just call nfs_flush() with commit == 1. 3134 */ 3135 /* ARGSUSED */ 3136 int 3137 nfs_fsync(void *v) 3138 { 3139 struct vop_fsync_args /* { 3140 struct vnodeop_desc *a_desc; 3141 struct vnode * a_vp; 3142 kauth_cred_t a_cred; 3143 int a_flags; 3144 off_t offlo; 3145 off_t offhi; 3146 struct lwp * a_l; 3147 } */ *ap = v; 3148 3149 struct vnode *vp = ap->a_vp; 3150 3151 if (vp->v_type != VREG) 3152 return 0; 3153 3154 return (nfs_flush(vp, ap->a_cred, 3155 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3156 } 3157 3158 /* 3159 * Flush all the data associated with a vnode. 3160 */ 3161 int 3162 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3163 int commit) 3164 { 3165 struct nfsnode *np = VTONFS(vp); 3166 int error; 3167 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3168 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3169 3170 mutex_enter(vp->v_interlock); 3171 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3172 if (np->n_flag & NWRITEERR) { 3173 error = np->n_error; 3174 np->n_flag &= ~NWRITEERR; 3175 } 3176 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3177 return (error); 3178 } 3179 3180 /* 3181 * Return POSIX pathconf information applicable to nfs. 3182 * 3183 * N.B. The NFS V2 protocol doesn't support this RPC. 3184 */ 3185 /* ARGSUSED */ 3186 int 3187 nfs_pathconf(void *v) 3188 { 3189 struct vop_pathconf_args /* { 3190 struct vnode *a_vp; 3191 int a_name; 3192 register_t *a_retval; 3193 } */ *ap = v; 3194 struct nfsv3_pathconf *pcp; 3195 struct vnode *vp = ap->a_vp; 3196 struct mbuf *mreq, *mrep, *md, *mb; 3197 int32_t t1, t2; 3198 u_int32_t *tl; 3199 char *bpos, *dpos, *cp, *cp2; 3200 int error = 0, attrflag; 3201 #ifndef NFS_V2_ONLY 3202 struct nfsmount *nmp; 3203 unsigned int l; 3204 u_int64_t maxsize; 3205 #endif 3206 const int v3 = NFS_ISV3(vp); 3207 struct nfsnode *np = VTONFS(vp); 3208 3209 switch (ap->a_name) { 3210 /* Names that can be resolved locally. */ 3211 case _PC_PIPE_BUF: 3212 *ap->a_retval = PIPE_BUF; 3213 break; 3214 case _PC_SYNC_IO: 3215 *ap->a_retval = 1; 3216 break; 3217 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3218 case _PC_LINK_MAX: 3219 case _PC_NAME_MAX: 3220 case _PC_CHOWN_RESTRICTED: 3221 case _PC_NO_TRUNC: 3222 if (!v3) { 3223 error = EINVAL; 3224 break; 3225 } 3226 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3227 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3228 nfsm_fhtom(np, 1); 3229 nfsm_request(np, NFSPROC_PATHCONF, 3230 curlwp, curlwp->l_cred); /* XXX */ 3231 nfsm_postop_attr(vp, attrflag, 0); 3232 if (!error) { 3233 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3234 NFSX_V3PATHCONF); 3235 switch (ap->a_name) { 3236 case _PC_LINK_MAX: 3237 *ap->a_retval = 3238 fxdr_unsigned(register_t, pcp->pc_linkmax); 3239 break; 3240 case _PC_NAME_MAX: 3241 *ap->a_retval = 3242 fxdr_unsigned(register_t, pcp->pc_namemax); 3243 break; 3244 case _PC_CHOWN_RESTRICTED: 3245 *ap->a_retval = 3246 (pcp->pc_chownrestricted == nfs_true); 3247 break; 3248 case _PC_NO_TRUNC: 3249 *ap->a_retval = 3250 (pcp->pc_notrunc == nfs_true); 3251 break; 3252 } 3253 } 3254 nfsm_reqdone; 3255 break; 3256 case _PC_FILESIZEBITS: 3257 #ifndef NFS_V2_ONLY 3258 if (v3) { 3259 nmp = VFSTONFS(vp->v_mount); 3260 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3261 if ((error = nfs_fsinfo(nmp, vp, 3262 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3263 break; 3264 for (l = 0, maxsize = nmp->nm_maxfilesize; 3265 (maxsize >> l) > 0; l++) 3266 ; 3267 *ap->a_retval = l + 1; 3268 } else 3269 #endif 3270 { 3271 *ap->a_retval = 32; /* NFS V2 limitation */ 3272 } 3273 break; 3274 default: 3275 error = EINVAL; 3276 break; 3277 } 3278 3279 return (error); 3280 } 3281 3282 /* 3283 * NFS advisory byte-level locks. 3284 */ 3285 int 3286 nfs_advlock(void *v) 3287 { 3288 struct vop_advlock_args /* { 3289 struct vnode *a_vp; 3290 void *a_id; 3291 int a_op; 3292 struct flock *a_fl; 3293 int a_flags; 3294 } */ *ap = v; 3295 struct nfsnode *np = VTONFS(ap->a_vp); 3296 3297 return lf_advlock(ap, &np->n_lockf, np->n_size); 3298 } 3299 3300 /* 3301 * Print out the contents of an nfsnode. 3302 */ 3303 int 3304 nfs_print(void *v) 3305 { 3306 struct vop_print_args /* { 3307 struct vnode *a_vp; 3308 } */ *ap = v; 3309 struct vnode *vp = ap->a_vp; 3310 struct nfsnode *np = VTONFS(vp); 3311 3312 printf("tag VT_NFS, fileid %lld fsid 0x%llx", 3313 (unsigned long long)np->n_vattr->va_fileid, 3314 (unsigned long long)np->n_vattr->va_fsid); 3315 if (vp->v_type == VFIFO) 3316 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 3317 printf("\n"); 3318 return (0); 3319 } 3320 3321 /* 3322 * nfs unlock wrapper. 3323 */ 3324 int 3325 nfs_unlock(void *v) 3326 { 3327 struct vop_unlock_args /* { 3328 struct vnode *a_vp; 3329 int a_flags; 3330 } */ *ap = v; 3331 struct vnode *vp = ap->a_vp; 3332 3333 /* 3334 * VOP_UNLOCK can be called by nfs_loadattrcache 3335 * with v_data == 0. 3336 */ 3337 if (VTONFS(vp)) { 3338 nfs_delayedtruncate(vp); 3339 } 3340 3341 return genfs_unlock(v); 3342 } 3343 3344 /* 3345 * nfs special file access vnode op. 3346 * Essentially just get vattr and then imitate iaccess() since the device is 3347 * local to the client. 3348 */ 3349 int 3350 nfsspec_access(void *v) 3351 { 3352 struct vop_access_args /* { 3353 struct vnode *a_vp; 3354 int a_mode; 3355 kauth_cred_t a_cred; 3356 struct lwp *a_l; 3357 } */ *ap = v; 3358 struct vattr va; 3359 struct vnode *vp = ap->a_vp; 3360 int error; 3361 3362 error = VOP_GETATTR(vp, &va, ap->a_cred); 3363 if (error) 3364 return (error); 3365 3366 /* 3367 * Disallow write attempts on filesystems mounted read-only; 3368 * unless the file is a socket, fifo, or a block or character 3369 * device resident on the filesystem. 3370 */ 3371 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3372 switch (vp->v_type) { 3373 case VREG: 3374 case VDIR: 3375 case VLNK: 3376 return (EROFS); 3377 default: 3378 break; 3379 } 3380 } 3381 3382 return kauth_authorize_vnode(ap->a_cred, KAUTH_ACCESS_ACTION(ap->a_mode, 3383 va.va_type, va.va_mode), vp, NULL, genfs_can_access(va.va_type, 3384 va.va_mode, va.va_uid, va.va_gid, ap->a_mode, ap->a_cred)); 3385 } 3386 3387 /* 3388 * Read wrapper for special devices. 3389 */ 3390 int 3391 nfsspec_read(void *v) 3392 { 3393 struct vop_read_args /* { 3394 struct vnode *a_vp; 3395 struct uio *a_uio; 3396 int a_ioflag; 3397 kauth_cred_t a_cred; 3398 } */ *ap = v; 3399 struct nfsnode *np = VTONFS(ap->a_vp); 3400 3401 /* 3402 * Set access flag. 3403 */ 3404 np->n_flag |= NACC; 3405 getnanotime(&np->n_atim); 3406 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3407 } 3408 3409 /* 3410 * Write wrapper for special devices. 3411 */ 3412 int 3413 nfsspec_write(void *v) 3414 { 3415 struct vop_write_args /* { 3416 struct vnode *a_vp; 3417 struct uio *a_uio; 3418 int a_ioflag; 3419 kauth_cred_t a_cred; 3420 } */ *ap = v; 3421 struct nfsnode *np = VTONFS(ap->a_vp); 3422 3423 /* 3424 * Set update flag. 3425 */ 3426 np->n_flag |= NUPD; 3427 getnanotime(&np->n_mtim); 3428 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3429 } 3430 3431 /* 3432 * Close wrapper for special devices. 3433 * 3434 * Update the times on the nfsnode then do device close. 3435 */ 3436 int 3437 nfsspec_close(void *v) 3438 { 3439 struct vop_close_args /* { 3440 struct vnode *a_vp; 3441 int a_fflag; 3442 kauth_cred_t a_cred; 3443 struct lwp *a_l; 3444 } */ *ap = v; 3445 struct vnode *vp = ap->a_vp; 3446 struct nfsnode *np = VTONFS(vp); 3447 struct vattr vattr; 3448 3449 if (np->n_flag & (NACC | NUPD)) { 3450 np->n_flag |= NCHG; 3451 if (vp->v_usecount == 1 && 3452 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3453 vattr_null(&vattr); 3454 if (np->n_flag & NACC) 3455 vattr.va_atime = np->n_atim; 3456 if (np->n_flag & NUPD) 3457 vattr.va_mtime = np->n_mtim; 3458 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3459 } 3460 } 3461 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3462 } 3463 3464 /* 3465 * Read wrapper for fifos. 3466 */ 3467 int 3468 nfsfifo_read(void *v) 3469 { 3470 struct vop_read_args /* { 3471 struct vnode *a_vp; 3472 struct uio *a_uio; 3473 int a_ioflag; 3474 kauth_cred_t a_cred; 3475 } */ *ap = v; 3476 struct nfsnode *np = VTONFS(ap->a_vp); 3477 3478 /* 3479 * Set access flag. 3480 */ 3481 np->n_flag |= NACC; 3482 getnanotime(&np->n_atim); 3483 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3484 } 3485 3486 /* 3487 * Write wrapper for fifos. 3488 */ 3489 int 3490 nfsfifo_write(void *v) 3491 { 3492 struct vop_write_args /* { 3493 struct vnode *a_vp; 3494 struct uio *a_uio; 3495 int a_ioflag; 3496 kauth_cred_t a_cred; 3497 } */ *ap = v; 3498 struct nfsnode *np = VTONFS(ap->a_vp); 3499 3500 /* 3501 * Set update flag. 3502 */ 3503 np->n_flag |= NUPD; 3504 getnanotime(&np->n_mtim); 3505 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3506 } 3507 3508 /* 3509 * Close wrapper for fifos. 3510 * 3511 * Update the times on the nfsnode then do fifo close. 3512 */ 3513 int 3514 nfsfifo_close(void *v) 3515 { 3516 struct vop_close_args /* { 3517 struct vnode *a_vp; 3518 int a_fflag; 3519 kauth_cred_t a_cred; 3520 struct lwp *a_l; 3521 } */ *ap = v; 3522 struct vnode *vp = ap->a_vp; 3523 struct nfsnode *np = VTONFS(vp); 3524 struct vattr vattr; 3525 3526 if (np->n_flag & (NACC | NUPD)) { 3527 struct timespec ts; 3528 3529 getnanotime(&ts); 3530 if (np->n_flag & NACC) 3531 np->n_atim = ts; 3532 if (np->n_flag & NUPD) 3533 np->n_mtim = ts; 3534 np->n_flag |= NCHG; 3535 if (vp->v_usecount == 1 && 3536 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3537 vattr_null(&vattr); 3538 if (np->n_flag & NACC) 3539 vattr.va_atime = np->n_atim; 3540 if (np->n_flag & NUPD) 3541 vattr.va_mtime = np->n_mtim; 3542 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3543 } 3544 } 3545 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3546 } 3547