1 /* $NetBSD: nfs_vnops.c,v 1.317 2020/09/05 16:30:12 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_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 1.317 2020/09/05 16:30:12 riastradh 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 #ifdef UVMHIST 74 #include <uvm/uvm.h> 75 #endif 76 #include <uvm/uvm_extern.h> 77 #include <uvm/uvm_stat.h> 78 79 #include <miscfs/fifofs/fifo.h> 80 #include <miscfs/genfs/genfs.h> 81 #include <miscfs/genfs/genfs_node.h> 82 #include <miscfs/specfs/specdev.h> 83 84 #include <nfs/rpcv2.h> 85 #include <nfs/nfsproto.h> 86 #include <nfs/nfs.h> 87 #include <nfs/nfsnode.h> 88 #include <nfs/nfsmount.h> 89 #include <nfs/xdr_subs.h> 90 #include <nfs/nfsm_subs.h> 91 #include <nfs/nfs_var.h> 92 93 #include <net/if.h> 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 97 /* 98 * Global vfs data structures for nfs 99 */ 100 int (**nfsv2_vnodeop_p)(void *); 101 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 102 { &vop_default_desc, vn_default_error }, 103 { &vop_lookup_desc, nfs_lookup }, /* lookup */ 104 { &vop_create_desc, nfs_create }, /* create */ 105 { &vop_mknod_desc, nfs_mknod }, /* mknod */ 106 { &vop_open_desc, nfs_open }, /* open */ 107 { &vop_close_desc, nfs_close }, /* close */ 108 { &vop_access_desc, nfs_access }, /* access */ 109 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 110 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 111 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 112 { &vop_read_desc, nfs_read }, /* read */ 113 { &vop_write_desc, nfs_write }, /* write */ 114 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 115 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 116 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 117 { &vop_ioctl_desc, nfs_ioctl }, /* ioctl */ 118 { &vop_poll_desc, nfs_poll }, /* poll */ 119 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 120 { &vop_revoke_desc, nfs_revoke }, /* revoke */ 121 { &vop_mmap_desc, nfs_mmap }, /* mmap */ 122 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 123 { &vop_seek_desc, nfs_seek }, /* seek */ 124 { &vop_remove_desc, nfs_remove }, /* remove */ 125 { &vop_link_desc, nfs_link }, /* link */ 126 { &vop_rename_desc, nfs_rename }, /* rename */ 127 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 128 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 129 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 130 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 131 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 132 { &vop_abortop_desc, nfs_abortop }, /* abortop */ 133 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 134 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 135 { &vop_lock_desc, nfs_lock }, /* lock */ 136 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 137 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 138 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 139 { &vop_print_desc, nfs_print }, /* print */ 140 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 141 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 142 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 143 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 144 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 145 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 146 { NULL, NULL } 147 }; 148 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 149 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 150 151 /* 152 * Special device vnode ops 153 */ 154 int (**spec_nfsv2nodeop_p)(void *); 155 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 156 { &vop_default_desc, vn_default_error }, 157 { &vop_lookup_desc, spec_lookup }, /* lookup */ 158 { &vop_create_desc, spec_create }, /* create */ 159 { &vop_mknod_desc, spec_mknod }, /* mknod */ 160 { &vop_open_desc, spec_open }, /* open */ 161 { &vop_close_desc, nfsspec_close }, /* close */ 162 { &vop_access_desc, nfsspec_access }, /* access */ 163 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 164 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 165 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 166 { &vop_read_desc, nfsspec_read }, /* read */ 167 { &vop_write_desc, nfsspec_write }, /* write */ 168 { &vop_fallocate_desc, spec_fallocate }, /* fallocate */ 169 { &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */ 170 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 171 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 172 { &vop_poll_desc, spec_poll }, /* poll */ 173 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 174 { &vop_revoke_desc, spec_revoke }, /* revoke */ 175 { &vop_mmap_desc, spec_mmap }, /* mmap */ 176 { &vop_fsync_desc, spec_fsync }, /* fsync */ 177 { &vop_seek_desc, spec_seek }, /* seek */ 178 { &vop_remove_desc, spec_remove }, /* remove */ 179 { &vop_link_desc, spec_link }, /* link */ 180 { &vop_rename_desc, spec_rename }, /* rename */ 181 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 182 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 183 { &vop_symlink_desc, spec_symlink }, /* symlink */ 184 { &vop_readdir_desc, spec_readdir }, /* readdir */ 185 { &vop_readlink_desc, spec_readlink }, /* readlink */ 186 { &vop_abortop_desc, spec_abortop }, /* abortop */ 187 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 188 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 189 { &vop_lock_desc, nfs_lock }, /* lock */ 190 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 191 { &vop_bmap_desc, spec_bmap }, /* bmap */ 192 { &vop_strategy_desc, spec_strategy }, /* strategy */ 193 { &vop_print_desc, nfs_print }, /* print */ 194 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 195 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 196 { &vop_advlock_desc, spec_advlock }, /* advlock */ 197 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 198 { &vop_getpages_desc, spec_getpages }, /* getpages */ 199 { &vop_putpages_desc, spec_putpages }, /* putpages */ 200 { NULL, NULL } 201 }; 202 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 203 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 204 205 int (**fifo_nfsv2nodeop_p)(void *); 206 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 207 { &vop_default_desc, vn_default_error }, 208 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 209 { &vop_create_desc, vn_fifo_bypass }, /* create */ 210 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 211 { &vop_open_desc, vn_fifo_bypass }, /* open */ 212 { &vop_close_desc, nfsfifo_close }, /* close */ 213 { &vop_access_desc, nfsspec_access }, /* access */ 214 { &vop_accessx_desc, genfs_accessx }, /* accessx */ 215 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 216 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 217 { &vop_read_desc, nfsfifo_read }, /* read */ 218 { &vop_write_desc, nfsfifo_write }, /* write */ 219 { &vop_fallocate_desc, vn_fifo_bypass }, /* fallocate */ 220 { &vop_fdiscard_desc, vn_fifo_bypass }, /* fdiscard */ 221 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 222 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 223 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 224 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 225 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 226 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 227 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 228 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 229 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 230 { &vop_link_desc, vn_fifo_bypass }, /* link */ 231 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 232 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 233 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 234 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 235 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 236 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 237 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 238 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 239 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 240 { &vop_lock_desc, nfs_lock }, /* lock */ 241 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 242 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 243 { &vop_strategy_desc, genfs_badop }, /* strategy */ 244 { &vop_print_desc, nfs_print }, /* print */ 245 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 246 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 247 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 248 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 249 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 250 { NULL, NULL } 251 }; 252 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 253 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 254 255 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 256 size_t, kauth_cred_t, struct lwp *); 257 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 258 259 /* 260 * Global variables 261 */ 262 extern u_int32_t nfs_true, nfs_false; 263 extern u_int32_t nfs_xdrneg1; 264 extern const nfstype nfsv3_type[9]; 265 266 int nfs_numasync = 0; 267 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 268 #define UIO_ADVANCE(uio, siz) \ 269 (void)((uio)->uio_resid -= (siz), \ 270 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 271 (uio)->uio_iov->iov_len -= (siz)) 272 273 static void nfs_cache_enter(struct vnode *, struct vnode *, 274 struct componentname *); 275 276 static void 277 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 278 struct componentname *cnp) 279 { 280 struct nfsnode *dnp = VTONFS(dvp); 281 282 if ((cnp->cn_flags & MAKEENTRY) == 0) { 283 return; 284 } 285 if (vp != NULL) { 286 struct nfsnode *np = VTONFS(vp); 287 288 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 289 } 290 291 if (!timespecisset(&dnp->n_nctime)) 292 dnp->n_nctime = dnp->n_vattr->va_mtime; 293 294 cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); 295 } 296 297 /* 298 * nfs null call from vfs. 299 */ 300 int 301 nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l) 302 { 303 char *bpos, *dpos; 304 int error = 0; 305 struct mbuf *mreq, *mrep, *md, *mb __unused; 306 struct nfsnode *np = VTONFS(vp); 307 308 nfsm_reqhead(np, NFSPROC_NULL, 0); 309 nfsm_request(np, NFSPROC_NULL, l, cred); 310 nfsm_reqdone; 311 return (error); 312 } 313 314 /* 315 * nfs access vnode op. 316 * For nfs version 2, just return ok. File accesses may fail later. 317 * For nfs version 3, use the access rpc to check accessibility. If file modes 318 * are changed on the server, accesses might still fail later. 319 */ 320 int 321 nfs_access(void *v) 322 { 323 struct vop_access_args /* { 324 struct vnode *a_vp; 325 accmode_t a_accmode; 326 kauth_cred_t a_cred; 327 } */ *ap = v; 328 struct vnode *vp = ap->a_vp; 329 #ifndef NFS_V2_ONLY 330 u_int32_t *tl; 331 char *cp; 332 int32_t t1, t2; 333 char *bpos, *dpos, *cp2; 334 int error = 0, attrflag; 335 struct mbuf *mreq, *mrep, *md, *mb; 336 u_int32_t mode, rmode; 337 const int v3 = NFS_ISV3(vp); 338 #endif 339 int cachevalid; 340 struct nfsnode *np = VTONFS(vp); 341 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 342 343 cachevalid = (np->n_accstamp != -1 && 344 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 345 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 346 347 /* 348 * Check access cache first. If this request has been made for this 349 * uid shortly before, use the cached result. 350 */ 351 if (cachevalid) { 352 if (!np->n_accerror) { 353 if ((np->n_accmode & ap->a_accmode) == ap->a_accmode) 354 return np->n_accerror; 355 } else if ((np->n_accmode & ap->a_accmode) == np->n_accmode) 356 return np->n_accerror; 357 } 358 359 #ifndef NFS_V2_ONLY 360 /* 361 * For nfs v3, do an access rpc, otherwise you are stuck emulating 362 * ufs_access() locally using the vattr. This may not be correct, 363 * since the server may apply other access criteria such as 364 * client uid-->server uid mapping that we do not know about, but 365 * this is better than just returning anything that is lying about 366 * in the cache. 367 */ 368 if (v3) { 369 nfsstats.rpccnt[NFSPROC_ACCESS]++; 370 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 371 nfsm_fhtom(np, v3); 372 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 373 if (ap->a_accmode & VREAD) 374 mode = NFSV3ACCESS_READ; 375 else 376 mode = 0; 377 if (vp->v_type != VDIR) { 378 if (ap->a_accmode & VWRITE) 379 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 380 if (ap->a_accmode & VEXEC) 381 mode |= NFSV3ACCESS_EXECUTE; 382 } else { 383 if (ap->a_accmode & VWRITE) 384 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 385 NFSV3ACCESS_DELETE); 386 if (ap->a_accmode & VEXEC) 387 mode |= NFSV3ACCESS_LOOKUP; 388 } 389 *tl = txdr_unsigned(mode); 390 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 391 nfsm_postop_attr(vp, attrflag, 0); 392 if (!error) { 393 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 394 rmode = fxdr_unsigned(u_int32_t, *tl); 395 /* 396 * The NFS V3 spec does not clarify whether or not 397 * the returned access bits can be a superset of 398 * the ones requested, so... 399 */ 400 if ((rmode & mode) != mode) 401 error = EACCES; 402 } 403 nfsm_reqdone; 404 } else 405 #endif 406 return (nfsspec_access(ap)); 407 #ifndef NFS_V2_ONLY 408 /* 409 * Disallow write attempts on filesystems mounted read-only; 410 * unless the file is a socket, fifo, or a block or character 411 * device resident on the filesystem. 412 */ 413 if (!error && (ap->a_accmode & VWRITE) && 414 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 415 switch (vp->v_type) { 416 case VREG: 417 case VDIR: 418 case VLNK: 419 error = EROFS; 420 default: 421 break; 422 } 423 } 424 425 if (!error || error == EACCES) { 426 /* 427 * If we got the same result as for a previous, 428 * different request, OR it in. Don't update 429 * the timestamp in that case. 430 */ 431 if (cachevalid && np->n_accstamp != -1 && 432 error == np->n_accerror) { 433 if (!error) 434 np->n_accmode |= ap->a_accmode; 435 else if ((np->n_accmode & ap->a_accmode) == ap->a_accmode) 436 np->n_accmode = ap->a_accmode; 437 } else { 438 np->n_accstamp = time_uptime; 439 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 440 np->n_accmode = ap->a_accmode; 441 np->n_accerror = error; 442 } 443 } 444 445 return (error); 446 #endif 447 } 448 449 /* 450 * nfs open vnode op 451 * Check to see if the type is ok 452 * and that deletion is not in progress. 453 * For paged in text files, you will need to flush the page cache 454 * if consistency is lost. 455 */ 456 /* ARGSUSED */ 457 int 458 nfs_open(void *v) 459 { 460 struct vop_open_args /* { 461 struct vnode *a_vp; 462 int a_mode; 463 kauth_cred_t a_cred; 464 } */ *ap = v; 465 struct vnode *vp = ap->a_vp; 466 struct nfsnode *np = VTONFS(vp); 467 int error; 468 469 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 470 return (EACCES); 471 } 472 473 if (ap->a_mode & FREAD) { 474 if (np->n_rcred != NULL) 475 kauth_cred_free(np->n_rcred); 476 np->n_rcred = ap->a_cred; 477 kauth_cred_hold(np->n_rcred); 478 } 479 if (ap->a_mode & FWRITE) { 480 if (np->n_wcred != NULL) 481 kauth_cred_free(np->n_wcred); 482 np->n_wcred = ap->a_cred; 483 kauth_cred_hold(np->n_wcred); 484 } 485 486 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 487 if (error) 488 return error; 489 490 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 491 492 return (0); 493 } 494 495 /* 496 * nfs close vnode op 497 * What an NFS client should do upon close after writing is a debatable issue. 498 * Most NFS clients push delayed writes to the server upon close, basically for 499 * two reasons: 500 * 1 - So that any write errors may be reported back to the client process 501 * doing the close system call. By far the two most likely errors are 502 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 503 * 2 - To put a worst case upper bound on cache inconsistency between 504 * multiple clients for the file. 505 * There is also a consistency problem for Version 2 of the protocol w.r.t. 506 * not being able to tell if other clients are writing a file concurrently, 507 * since there is no way of knowing if the changed modify time in the reply 508 * is only due to the write for this client. 509 * (NFS Version 3 provides weak cache consistency data in the reply that 510 * should be sufficient to detect and handle this case.) 511 * 512 * The current code does the following: 513 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 514 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 515 * or commit them (this satisfies 1 and 2 except for the 516 * case where the server crashes after this close but 517 * before the commit RPC, which is felt to be "good 518 * enough". Changing the last argument to nfs_flush() to 519 * a 1 would force a commit operation, if it is felt a 520 * commit is necessary now. 521 */ 522 /* ARGSUSED */ 523 int 524 nfs_close(void *v) 525 { 526 struct vop_close_args /* { 527 struct vnodeop_desc *a_desc; 528 struct vnode *a_vp; 529 int a_fflag; 530 kauth_cred_t a_cred; 531 } */ *ap = v; 532 struct vnode *vp = ap->a_vp; 533 struct nfsnode *np = VTONFS(vp); 534 int error = 0; 535 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 536 537 if (vp->v_type == VREG) { 538 if (np->n_flag & NMODIFIED) { 539 #ifndef NFS_V2_ONLY 540 if (NFS_ISV3(vp)) { 541 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 542 np->n_flag &= ~NMODIFIED; 543 } else 544 #endif 545 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 546 NFS_INVALIDATE_ATTRCACHE(np); 547 } 548 if (np->n_flag & NWRITEERR) { 549 np->n_flag &= ~NWRITEERR; 550 error = np->n_error; 551 } 552 } 553 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 554 return (error); 555 } 556 557 /* 558 * nfs getattr call from vfs. 559 */ 560 int 561 nfs_getattr(void *v) 562 { 563 struct vop_getattr_args /* { 564 struct vnode *a_vp; 565 struct vattr *a_vap; 566 kauth_cred_t a_cred; 567 } */ *ap = v; 568 struct vnode *vp = ap->a_vp; 569 struct nfsnode *np = VTONFS(vp); 570 char *cp; 571 u_int32_t *tl; 572 int32_t t1, t2; 573 char *bpos, *dpos; 574 int error = 0; 575 struct mbuf *mreq, *mrep, *md, *mb; 576 const int v3 = NFS_ISV3(vp); 577 578 /* 579 * Update local times for special files. 580 */ 581 if (np->n_flag & (NACC | NUPD)) 582 np->n_flag |= NCHG; 583 584 /* 585 * if we have delayed truncation, do it now. 586 */ 587 nfs_delayedtruncate(vp); 588 589 /* 590 * First look in the cache. 591 */ 592 if (nfs_getattrcache(vp, ap->a_vap) == 0) 593 return (0); 594 nfsstats.rpccnt[NFSPROC_GETATTR]++; 595 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 596 nfsm_fhtom(np, v3); 597 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 598 if (!error) { 599 nfsm_loadattr(vp, ap->a_vap, 0); 600 if (vp->v_type == VDIR && 601 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 602 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 603 } 604 nfsm_reqdone; 605 return (error); 606 } 607 608 /* 609 * nfs setattr call. 610 */ 611 int 612 nfs_setattr(void *v) 613 { 614 struct vop_setattr_args /* { 615 struct vnodeop_desc *a_desc; 616 struct vnode *a_vp; 617 struct vattr *a_vap; 618 kauth_cred_t a_cred; 619 } */ *ap = v; 620 struct vnode *vp = ap->a_vp; 621 struct nfsnode *np = VTONFS(vp); 622 struct vattr *vap = ap->a_vap; 623 int error = 0; 624 u_quad_t tsize = 0; 625 626 /* 627 * Setting of flags is not supported. 628 */ 629 if (vap->va_flags != VNOVAL) 630 return (EOPNOTSUPP); 631 632 /* 633 * Disallow write attempts if the filesystem is mounted read-only. 634 */ 635 if ((vap->va_uid != (uid_t)VNOVAL || 636 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 637 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 638 (vp->v_mount->mnt_flag & MNT_RDONLY)) 639 return (EROFS); 640 if (vap->va_size != VNOVAL) { 641 if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { 642 return EFBIG; 643 } 644 switch (vp->v_type) { 645 case VDIR: 646 return (EISDIR); 647 case VCHR: 648 case VBLK: 649 case VSOCK: 650 case VFIFO: 651 if (vap->va_mtime.tv_sec == VNOVAL && 652 vap->va_atime.tv_sec == VNOVAL && 653 vap->va_mode == (mode_t)VNOVAL && 654 vap->va_uid == (uid_t)VNOVAL && 655 vap->va_gid == (gid_t)VNOVAL) 656 return (0); 657 vap->va_size = VNOVAL; 658 break; 659 default: 660 /* 661 * Disallow write attempts if the filesystem is 662 * mounted read-only. 663 */ 664 if (vp->v_mount->mnt_flag & MNT_RDONLY) 665 return (EROFS); 666 genfs_node_wrlock(vp); 667 uvm_vnp_setsize(vp, vap->va_size); 668 tsize = np->n_size; 669 np->n_size = vap->va_size; 670 if (vap->va_size == 0) 671 error = nfs_vinvalbuf(vp, 0, 672 ap->a_cred, curlwp, 1); 673 else 674 error = nfs_vinvalbuf(vp, V_SAVE, 675 ap->a_cred, curlwp, 1); 676 if (error) { 677 uvm_vnp_setsize(vp, tsize); 678 genfs_node_unlock(vp); 679 return (error); 680 } 681 np->n_vattr->va_size = vap->va_size; 682 } 683 } else { 684 /* 685 * flush files before setattr because a later write of 686 * cached data might change timestamps or reset sugid bits 687 */ 688 if ((vap->va_mtime.tv_sec != VNOVAL || 689 vap->va_atime.tv_sec != VNOVAL || 690 vap->va_mode != VNOVAL) && 691 vp->v_type == VREG && 692 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 693 curlwp, 1)) == EINTR) 694 return (error); 695 } 696 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 697 if (vap->va_size != VNOVAL) { 698 if (error) { 699 np->n_size = np->n_vattr->va_size = tsize; 700 uvm_vnp_setsize(vp, np->n_size); 701 } 702 genfs_node_unlock(vp); 703 } 704 VN_KNOTE(vp, NOTE_ATTRIB); 705 return (error); 706 } 707 708 /* 709 * Do an nfs setattr rpc. 710 */ 711 int 712 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, struct lwp *l) 713 { 714 struct nfsv2_sattr *sp; 715 char *cp; 716 int32_t t1, t2; 717 char *bpos, *dpos; 718 u_int32_t *tl; 719 int error = 0; 720 struct mbuf *mreq, *mrep, *md, *mb; 721 const int v3 = NFS_ISV3(vp); 722 struct nfsnode *np = VTONFS(vp); 723 #ifndef NFS_V2_ONLY 724 int wccflag = NFSV3_WCCRATTR; 725 char *cp2; 726 #endif 727 728 nfsstats.rpccnt[NFSPROC_SETATTR]++; 729 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 730 nfsm_fhtom(np, v3); 731 #ifndef NFS_V2_ONLY 732 if (v3) { 733 nfsm_v3attrbuild(vap, true); 734 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 735 *tl = nfs_false; 736 } else { 737 #endif 738 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 739 if (vap->va_mode == (mode_t)VNOVAL) 740 sp->sa_mode = nfs_xdrneg1; 741 else 742 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 743 if (vap->va_uid == (uid_t)VNOVAL) 744 sp->sa_uid = nfs_xdrneg1; 745 else 746 sp->sa_uid = txdr_unsigned(vap->va_uid); 747 if (vap->va_gid == (gid_t)VNOVAL) 748 sp->sa_gid = nfs_xdrneg1; 749 else 750 sp->sa_gid = txdr_unsigned(vap->va_gid); 751 sp->sa_size = txdr_unsigned(vap->va_size); 752 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 753 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 754 #ifndef NFS_V2_ONLY 755 } 756 #endif 757 nfsm_request(np, NFSPROC_SETATTR, l, cred); 758 #ifndef NFS_V2_ONLY 759 if (v3) { 760 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 761 } else 762 #endif 763 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 764 nfsm_reqdone; 765 return (error); 766 } 767 768 /* 769 * nfs lookup call, one step at a time... 770 * First look in cache 771 * If not found, do the rpc. 772 */ 773 int 774 nfs_lookup(void *v) 775 { 776 struct vop_lookup_v2_args /* { 777 struct vnodeop_desc *a_desc; 778 struct vnode *a_dvp; 779 struct vnode **a_vpp; 780 struct componentname *a_cnp; 781 } */ *ap = v; 782 struct componentname *cnp = ap->a_cnp; 783 struct vnode *dvp = ap->a_dvp; 784 struct vnode **vpp = ap->a_vpp; 785 int flags; 786 struct vnode *newvp; 787 u_int32_t *tl; 788 char *cp; 789 int32_t t1, t2; 790 char *bpos, *dpos, *cp2; 791 struct mbuf *mreq, *mrep, *md, *mb; 792 long len; 793 nfsfh_t *fhp; 794 struct nfsnode *np; 795 int cachefound; 796 int error = 0, attrflag, fhsize; 797 const int v3 = NFS_ISV3(dvp); 798 799 flags = cnp->cn_flags; 800 801 *vpp = NULLVP; 802 newvp = NULLVP; 803 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 804 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 805 return (EROFS); 806 if (dvp->v_type != VDIR) 807 return (ENOTDIR); 808 809 /* 810 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 811 */ 812 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 813 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 814 if (error) 815 return error; 816 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 817 return EISDIR; 818 vref(dvp); 819 *vpp = dvp; 820 return 0; 821 } 822 823 np = VTONFS(dvp); 824 825 /* 826 * Before performing an RPC, check the name cache to see if 827 * the directory/name pair we are looking for is known already. 828 * If the directory/name pair is found in the name cache, 829 * we have to ensure the directory has not changed from 830 * the time the cache entry has been created. If it has, 831 * the cache entry has to be ignored. 832 */ 833 cachefound = cache_lookup_raw(dvp, cnp->cn_nameptr, cnp->cn_namelen, 834 cnp->cn_flags, NULL, vpp); 835 KASSERT(dvp != *vpp); 836 KASSERT((cnp->cn_flags & ISWHITEOUT) == 0); 837 if (cachefound) { 838 struct vattr vattr; 839 840 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 841 if (error != 0) { 842 if (*vpp != NULLVP) 843 vrele(*vpp); 844 *vpp = NULLVP; 845 return error; 846 } 847 848 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 849 || timespeccmp(&vattr.va_mtime, 850 &VTONFS(dvp)->n_nctime, !=)) { 851 if (*vpp != NULLVP) { 852 vrele(*vpp); 853 *vpp = NULLVP; 854 } 855 cache_purge1(dvp, NULL, 0, PURGE_CHILDREN); 856 timespecclear(&np->n_nctime); 857 goto dorpc; 858 } 859 860 if (*vpp == NULLVP) { 861 /* namecache gave us a negative result */ 862 error = ENOENT; 863 goto noentry; 864 } 865 866 /* 867 * investigate the vnode returned by cache_lookup_raw. 868 * if it isn't appropriate, do an rpc. 869 */ 870 newvp = *vpp; 871 if ((flags & ISDOTDOT) != 0) { 872 VOP_UNLOCK(dvp); 873 } 874 error = vn_lock(newvp, LK_SHARED); 875 if ((flags & ISDOTDOT) != 0) { 876 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 877 } 878 if (error != 0) { 879 /* newvp has been reclaimed. */ 880 vrele(newvp); 881 *vpp = NULLVP; 882 goto dorpc; 883 } 884 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 885 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 886 nfsstats.lookupcache_hits++; 887 KASSERT(newvp->v_type != VNON); 888 VOP_UNLOCK(newvp); 889 return (0); 890 } 891 cache_purge1(newvp, NULL, 0, PURGE_PARENTS); 892 vput(newvp); 893 *vpp = NULLVP; 894 } 895 dorpc: 896 #if 0 897 /* 898 * because nfsv3 has the same CREATE semantics as ours, 899 * we don't have to perform LOOKUPs beforehand. 900 * 901 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 902 * XXX although we have no way to know if O_EXCL is requested or not. 903 */ 904 905 if (v3 && cnp->cn_nameiop == CREATE && 906 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 907 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 908 return (EJUSTRETURN); 909 } 910 #endif /* 0 */ 911 912 error = 0; 913 newvp = NULLVP; 914 nfsstats.lookupcache_misses++; 915 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 916 len = cnp->cn_namelen; 917 nfsm_reqhead(np, NFSPROC_LOOKUP, 918 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 919 nfsm_fhtom(np, v3); 920 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 921 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 922 if (error) { 923 nfsm_postop_attr(dvp, attrflag, 0); 924 m_freem(mrep); 925 goto nfsmout; 926 } 927 nfsm_getfh(fhp, fhsize, v3); 928 929 /* 930 * Handle RENAME case... 931 */ 932 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 933 if (NFS_CMPFH(np, fhp, fhsize)) { 934 m_freem(mrep); 935 return (EISDIR); 936 } 937 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 938 if (error) { 939 m_freem(mrep); 940 return error; 941 } 942 newvp = NFSTOV(np); 943 #ifndef NFS_V2_ONLY 944 if (v3) { 945 nfsm_postop_attr(newvp, attrflag, 0); 946 nfsm_postop_attr(dvp, attrflag, 0); 947 } else 948 #endif 949 nfsm_loadattr(newvp, (struct vattr *)0, 0); 950 *vpp = newvp; 951 m_freem(mrep); 952 goto validate; 953 } 954 955 /* 956 * The postop attr handling is duplicated for each if case, 957 * because it should be done while dvp is locked (unlocking 958 * dvp is different for each case). 959 */ 960 961 if (NFS_CMPFH(np, fhp, fhsize)) { 962 /* 963 * As we handle "." lookup locally, this is 964 * a broken server. 965 */ 966 m_freem(mrep); 967 return EBADRPC; 968 } else if (flags & ISDOTDOT) { 969 /* 970 * ".." lookup 971 */ 972 VOP_UNLOCK(dvp); 973 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 974 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 975 if (error) { 976 m_freem(mrep); 977 return error; 978 } 979 newvp = NFSTOV(np); 980 981 #ifndef NFS_V2_ONLY 982 if (v3) { 983 nfsm_postop_attr(newvp, attrflag, 0); 984 nfsm_postop_attr(dvp, attrflag, 0); 985 } else 986 #endif 987 nfsm_loadattr(newvp, (struct vattr *)0, 0); 988 } else { 989 /* 990 * Other lookups. 991 */ 992 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 993 if (error) { 994 m_freem(mrep); 995 return error; 996 } 997 newvp = NFSTOV(np); 998 #ifndef NFS_V2_ONLY 999 if (v3) { 1000 nfsm_postop_attr(newvp, attrflag, 0); 1001 nfsm_postop_attr(dvp, attrflag, 0); 1002 } else 1003 #endif 1004 nfsm_loadattr(newvp, (struct vattr *)0, 0); 1005 } 1006 if (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) { 1007 nfs_cache_enter(dvp, newvp, cnp); 1008 } 1009 *vpp = newvp; 1010 nfsm_reqdone; 1011 if (error) { 1012 /* 1013 * We get here only because of errors returned by 1014 * the RPC. Otherwise we'll have returned above 1015 * (the nfsm_* macros will jump to nfsm_reqdone 1016 * on error). 1017 */ 1018 if (error == ENOENT && cnp->cn_nameiop != CREATE) { 1019 nfs_cache_enter(dvp, NULL, cnp); 1020 } 1021 if (newvp != NULLVP) { 1022 if (newvp == dvp) { 1023 vrele(newvp); 1024 } else { 1025 vput(newvp); 1026 } 1027 } 1028 noentry: 1029 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1030 (flags & ISLASTCN) && error == ENOENT) { 1031 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 1032 error = EROFS; 1033 } else { 1034 error = EJUSTRETURN; 1035 } 1036 } 1037 *vpp = NULL; 1038 return error; 1039 } 1040 1041 validate: 1042 /* 1043 * make sure we have valid type and size. 1044 */ 1045 1046 newvp = *vpp; 1047 if (newvp->v_type == VNON) { 1048 struct vattr vattr; /* dummy */ 1049 1050 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1051 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1052 if (error) { 1053 vput(newvp); 1054 *vpp = NULL; 1055 } 1056 } 1057 if (error) 1058 return error; 1059 if (newvp != dvp) 1060 VOP_UNLOCK(newvp); 1061 return 0; 1062 } 1063 1064 /* 1065 * nfs read call. 1066 * Just call nfs_bioread() to do the work. 1067 */ 1068 int 1069 nfs_read(void *v) 1070 { 1071 struct vop_read_args /* { 1072 struct vnode *a_vp; 1073 struct uio *a_uio; 1074 int a_ioflag; 1075 kauth_cred_t a_cred; 1076 } */ *ap = v; 1077 struct vnode *vp = ap->a_vp; 1078 1079 if (vp->v_type != VREG) 1080 return EISDIR; 1081 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1082 } 1083 1084 /* 1085 * nfs readlink call 1086 */ 1087 int 1088 nfs_readlink(void *v) 1089 { 1090 struct vop_readlink_args /* { 1091 struct vnode *a_vp; 1092 struct uio *a_uio; 1093 kauth_cred_t a_cred; 1094 } */ *ap = v; 1095 struct vnode *vp = ap->a_vp; 1096 struct nfsnode *np = VTONFS(vp); 1097 1098 if (vp->v_type != VLNK) 1099 return (EPERM); 1100 1101 if (np->n_rcred != NULL) { 1102 kauth_cred_free(np->n_rcred); 1103 } 1104 np->n_rcred = ap->a_cred; 1105 kauth_cred_hold(np->n_rcred); 1106 1107 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1108 } 1109 1110 /* 1111 * Do a readlink rpc. 1112 * Called by nfs_doio() from below the buffer cache. 1113 */ 1114 int 1115 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 1116 { 1117 u_int32_t *tl; 1118 char *cp; 1119 int32_t t1, t2; 1120 char *bpos, *dpos, *cp2; 1121 int error = 0; 1122 uint32_t len; 1123 struct mbuf *mreq, *mrep, *md, *mb; 1124 const int v3 = NFS_ISV3(vp); 1125 struct nfsnode *np = VTONFS(vp); 1126 #ifndef NFS_V2_ONLY 1127 int attrflag; 1128 #endif 1129 1130 nfsstats.rpccnt[NFSPROC_READLINK]++; 1131 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1132 nfsm_fhtom(np, v3); 1133 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1134 #ifndef NFS_V2_ONLY 1135 if (v3) 1136 nfsm_postop_attr(vp, attrflag, 0); 1137 #endif 1138 if (!error) { 1139 #ifndef NFS_V2_ONLY 1140 if (v3) { 1141 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1142 len = fxdr_unsigned(uint32_t, *tl); 1143 if (len > NFS_MAXPATHLEN) { 1144 /* 1145 * this pathname is too long for us. 1146 */ 1147 m_freem(mrep); 1148 /* Solaris returns EINVAL. should we follow? */ 1149 error = ENAMETOOLONG; 1150 goto nfsmout; 1151 } 1152 } else 1153 #endif 1154 { 1155 nfsm_strsiz(len, NFS_MAXPATHLEN); 1156 } 1157 nfsm_mtouio(uiop, len); 1158 } 1159 nfsm_reqdone; 1160 return (error); 1161 } 1162 1163 /* 1164 * nfs read rpc call 1165 * Ditto above 1166 */ 1167 int 1168 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1169 { 1170 u_int32_t *tl; 1171 char *cp; 1172 int32_t t1, t2; 1173 char *bpos, *dpos, *cp2; 1174 struct mbuf *mreq, *mrep, *md, *mb; 1175 struct nfsmount *nmp; 1176 int error = 0, len, retlen, tsiz, eof __unused, byte_count; 1177 const int v3 = NFS_ISV3(vp); 1178 struct nfsnode *np = VTONFS(vp); 1179 #ifndef NFS_V2_ONLY 1180 int attrflag; 1181 #endif 1182 1183 #ifndef nolint 1184 eof = 0; 1185 #endif 1186 nmp = VFSTONFS(vp->v_mount); 1187 tsiz = uiop->uio_resid; 1188 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1189 return (EFBIG); 1190 iostat_busy(nmp->nm_stats); 1191 byte_count = 0; /* count bytes actually transferred */ 1192 while (tsiz > 0) { 1193 nfsstats.rpccnt[NFSPROC_READ]++; 1194 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1195 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1196 nfsm_fhtom(np, v3); 1197 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1198 #ifndef NFS_V2_ONLY 1199 if (v3) { 1200 txdr_hyper(uiop->uio_offset, tl); 1201 *(tl + 2) = txdr_unsigned(len); 1202 } else 1203 #endif 1204 { 1205 *tl++ = txdr_unsigned(uiop->uio_offset); 1206 *tl++ = txdr_unsigned(len); 1207 *tl = 0; 1208 } 1209 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1210 #ifndef NFS_V2_ONLY 1211 if (v3) { 1212 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1213 if (error) { 1214 m_freem(mrep); 1215 goto nfsmout; 1216 } 1217 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1218 eof = fxdr_unsigned(int, *(tl + 1)); 1219 } else 1220 #endif 1221 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1222 nfsm_strsiz(retlen, nmp->nm_rsize); 1223 nfsm_mtouio(uiop, retlen); 1224 m_freem(mrep); 1225 tsiz -= retlen; 1226 byte_count += retlen; 1227 #ifndef NFS_V2_ONLY 1228 if (v3) { 1229 if (eof || retlen == 0) 1230 tsiz = 0; 1231 } else 1232 #endif 1233 if (retlen < len) 1234 tsiz = 0; 1235 } 1236 nfsmout: 1237 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1238 return (error); 1239 } 1240 1241 struct nfs_writerpc_context { 1242 kmutex_t nwc_lock; 1243 kcondvar_t nwc_cv; 1244 int nwc_mbufcount; 1245 }; 1246 1247 /* 1248 * free mbuf used to refer protected pages while write rpc call. 1249 * called at splvm. 1250 */ 1251 static void 1252 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1253 { 1254 struct nfs_writerpc_context *ctx = arg; 1255 1256 KASSERT(m != NULL); 1257 KASSERT(ctx != NULL); 1258 pool_cache_put(mb_cache, m); 1259 mutex_enter(&ctx->nwc_lock); 1260 if (--ctx->nwc_mbufcount == 0) { 1261 cv_signal(&ctx->nwc_cv); 1262 } 1263 mutex_exit(&ctx->nwc_lock); 1264 } 1265 1266 /* 1267 * nfs write call 1268 */ 1269 int 1270 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp) 1271 { 1272 u_int32_t *tl; 1273 char *cp; 1274 int32_t t1, t2; 1275 char *bpos, *dpos; 1276 struct mbuf *mreq, *mrep, *md, *mb; 1277 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1278 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1279 const int v3 = NFS_ISV3(vp); 1280 int committed = NFSV3WRITE_FILESYNC; 1281 struct nfsnode *np = VTONFS(vp); 1282 struct nfs_writerpc_context ctx; 1283 int byte_count; 1284 size_t origresid; 1285 #ifndef NFS_V2_ONLY 1286 char *cp2; 1287 int rlen, commit; 1288 #endif 1289 1290 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1291 panic("writerpc readonly vp %p", vp); 1292 } 1293 1294 #ifdef DIAGNOSTIC 1295 if (uiop->uio_iovcnt != 1) 1296 panic("nfs: writerpc iovcnt > 1"); 1297 #endif 1298 tsiz = uiop->uio_resid; 1299 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1300 return EFBIG; 1301 1302 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1303 cv_init(&ctx.nwc_cv, "nfsmblk"); 1304 ctx.nwc_mbufcount = 1; 1305 1306 retry: 1307 origresid = uiop->uio_resid; 1308 KASSERT(origresid == uiop->uio_iov->iov_len); 1309 iostat_busy(nmp->nm_stats); 1310 byte_count = 0; /* count of bytes actually written */ 1311 while (tsiz > 0) { 1312 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1313 size_t backup; 1314 bool stalewriteverf = false; 1315 1316 nfsstats.rpccnt[NFSPROC_WRITE]++; 1317 len = uimin(tsiz, nmp->nm_wsize); 1318 datalen = pageprotected ? 0 : nfsm_rndup(len); 1319 nfsm_reqhead(np, NFSPROC_WRITE, 1320 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1321 nfsm_fhtom(np, v3); 1322 #ifndef NFS_V2_ONLY 1323 if (v3) { 1324 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1325 txdr_hyper(uiop->uio_offset, tl); 1326 tl += 2; 1327 *tl++ = txdr_unsigned(len); 1328 *tl++ = txdr_unsigned(*iomode); 1329 *tl = txdr_unsigned(len); 1330 } else 1331 #endif 1332 { 1333 u_int32_t x; 1334 1335 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1336 /* Set both "begin" and "current" to non-garbage. */ 1337 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1338 *tl++ = x; /* "begin offset" */ 1339 *tl++ = x; /* "current offset" */ 1340 x = txdr_unsigned(len); 1341 *tl++ = x; /* total to this offset */ 1342 *tl = x; /* size of this write */ 1343 1344 } 1345 if (pageprotected) { 1346 /* 1347 * since we know pages can't be modified during i/o, 1348 * no need to copy them for us. 1349 */ 1350 struct mbuf *m; 1351 struct iovec *iovp = uiop->uio_iov; 1352 1353 m = m_get(M_WAIT, MT_DATA); 1354 MCLAIM(m, &nfs_mowner); 1355 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1356 nfs_writerpc_extfree, &ctx); 1357 m->m_flags |= M_EXT_ROMAP; 1358 m->m_len = len; 1359 mb->m_next = m; 1360 /* 1361 * no need to maintain mb and bpos here 1362 * because no one care them later. 1363 */ 1364 #if 0 1365 mb = m; 1366 bpos = mtod(void *, mb) + mb->m_len; 1367 #endif 1368 UIO_ADVANCE(uiop, len); 1369 uiop->uio_offset += len; 1370 mutex_enter(&ctx.nwc_lock); 1371 ctx.nwc_mbufcount++; 1372 mutex_exit(&ctx.nwc_lock); 1373 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1374 } else { 1375 nfsm_uiotom(uiop, len); 1376 } 1377 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1378 #ifndef NFS_V2_ONLY 1379 if (v3) { 1380 wccflag = NFSV3_WCCCHK; 1381 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1382 if (!error) { 1383 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1384 + NFSX_V3WRITEVERF); 1385 rlen = fxdr_unsigned(int, *tl++); 1386 if (rlen == 0) { 1387 error = NFSERR_IO; 1388 m_freem(mrep); 1389 break; 1390 } else if (rlen < len) { 1391 backup = len - rlen; 1392 UIO_ADVANCE(uiop, -backup); 1393 uiop->uio_offset -= backup; 1394 len = rlen; 1395 } 1396 commit = fxdr_unsigned(int, *tl++); 1397 1398 /* 1399 * Return the lowest committment level 1400 * obtained by any of the RPCs. 1401 */ 1402 if (committed == NFSV3WRITE_FILESYNC) 1403 committed = commit; 1404 else if (committed == NFSV3WRITE_DATASYNC && 1405 commit == NFSV3WRITE_UNSTABLE) 1406 committed = commit; 1407 mutex_enter(&nmp->nm_lock); 1408 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1409 memcpy(nmp->nm_writeverf, tl, 1410 NFSX_V3WRITEVERF); 1411 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1412 } else if ((nmp->nm_iflag & 1413 NFSMNT_STALEWRITEVERF) || 1414 memcmp(tl, nmp->nm_writeverf, 1415 NFSX_V3WRITEVERF)) { 1416 memcpy(nmp->nm_writeverf, tl, 1417 NFSX_V3WRITEVERF); 1418 /* 1419 * note NFSMNT_STALEWRITEVERF 1420 * if we're the first thread to 1421 * notice it. 1422 */ 1423 if ((nmp->nm_iflag & 1424 NFSMNT_STALEWRITEVERF) == 0) { 1425 stalewriteverf = true; 1426 nmp->nm_iflag |= 1427 NFSMNT_STALEWRITEVERF; 1428 } 1429 } 1430 mutex_exit(&nmp->nm_lock); 1431 } 1432 } else 1433 #endif 1434 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1435 if (wccflag) 1436 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1437 m_freem(mrep); 1438 if (error) 1439 break; 1440 tsiz -= len; 1441 byte_count += len; 1442 if (stalewriteverf) { 1443 *stalewriteverfp = true; 1444 stalewriteverf = false; 1445 if (committed == NFSV3WRITE_UNSTABLE && 1446 len != origresid) { 1447 /* 1448 * if our write requests weren't atomic but 1449 * unstable, datas in previous iterations 1450 * might have already been lost now. 1451 * then, we should resend them to nfsd. 1452 */ 1453 backup = origresid - tsiz; 1454 UIO_ADVANCE(uiop, -backup); 1455 uiop->uio_offset -= backup; 1456 tsiz = origresid; 1457 goto retry; 1458 } 1459 } 1460 } 1461 nfsmout: 1462 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1463 if (pageprotected) { 1464 /* 1465 * wait until mbufs go away. 1466 * retransmitted mbufs can survive longer than rpc requests 1467 * themselves. 1468 */ 1469 mutex_enter(&ctx.nwc_lock); 1470 ctx.nwc_mbufcount--; 1471 while (ctx.nwc_mbufcount > 0) { 1472 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1473 } 1474 mutex_exit(&ctx.nwc_lock); 1475 } 1476 mutex_destroy(&ctx.nwc_lock); 1477 cv_destroy(&ctx.nwc_cv); 1478 *iomode = committed; 1479 if (error) 1480 uiop->uio_resid = tsiz; 1481 return (error); 1482 } 1483 1484 /* 1485 * nfs mknod rpc 1486 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1487 * mode set to specify the file type and the size field for rdev. 1488 */ 1489 int 1490 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) 1491 { 1492 struct nfsv2_sattr *sp; 1493 u_int32_t *tl; 1494 char *cp; 1495 int32_t t1, t2; 1496 struct vnode *newvp = (struct vnode *)0; 1497 struct nfsnode *dnp, *np; 1498 char *cp2; 1499 char *bpos, *dpos; 1500 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1501 struct mbuf *mreq, *mrep, *md, *mb; 1502 u_int32_t rdev; 1503 const int v3 = NFS_ISV3(dvp); 1504 1505 if (vap->va_type == VCHR || vap->va_type == VBLK) 1506 rdev = txdr_unsigned(vap->va_rdev); 1507 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1508 rdev = nfs_xdrneg1; 1509 else { 1510 VOP_ABORTOP(dvp, cnp); 1511 return (EOPNOTSUPP); 1512 } 1513 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1514 dnp = VTONFS(dvp); 1515 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1516 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1517 nfsm_fhtom(dnp, v3); 1518 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1519 #ifndef NFS_V2_ONLY 1520 if (v3) { 1521 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1522 *tl++ = vtonfsv3_type(vap->va_type); 1523 nfsm_v3attrbuild(vap, false); 1524 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1525 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1526 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1527 *tl = txdr_unsigned(minor(vap->va_rdev)); 1528 } 1529 } else 1530 #endif 1531 { 1532 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1533 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1534 sp->sa_uid = nfs_xdrneg1; 1535 sp->sa_gid = nfs_xdrneg1; 1536 sp->sa_size = rdev; 1537 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1538 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1539 } 1540 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1541 if (!error) { 1542 nfsm_mtofh(dvp, newvp, v3, gotvp); 1543 if (!gotvp) { 1544 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1545 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1546 if (!error) 1547 newvp = NFSTOV(np); 1548 } 1549 } 1550 #ifndef NFS_V2_ONLY 1551 if (v3) 1552 nfsm_wcc_data(dvp, wccflag, 0, !error); 1553 #endif 1554 nfsm_reqdone; 1555 if (error) { 1556 if (newvp) 1557 vput(newvp); 1558 } else { 1559 nfs_cache_enter(dvp, newvp, cnp); 1560 *vpp = newvp; 1561 VOP_UNLOCK(newvp); 1562 } 1563 VTONFS(dvp)->n_flag |= NMODIFIED; 1564 if (!wccflag) 1565 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1566 return (error); 1567 } 1568 1569 /* 1570 * nfs mknod vop 1571 * just call nfs_mknodrpc() to do the work. 1572 */ 1573 /* ARGSUSED */ 1574 int 1575 nfs_mknod(void *v) 1576 { 1577 struct vop_mknod_v3_args /* { 1578 struct vnode *a_dvp; 1579 struct vnode **a_vpp; 1580 struct componentname *a_cnp; 1581 struct vattr *a_vap; 1582 } */ *ap = v; 1583 struct vnode *dvp = ap->a_dvp; 1584 struct componentname *cnp = ap->a_cnp; 1585 int error; 1586 1587 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap); 1588 VN_KNOTE(dvp, NOTE_WRITE); 1589 if (error == 0 || error == EEXIST) 1590 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1591 return (error); 1592 } 1593 1594 /* 1595 * nfs file create call 1596 */ 1597 int 1598 nfs_create(void *v) 1599 { 1600 struct vop_create_v3_args /* { 1601 struct vnode *a_dvp; 1602 struct vnode **a_vpp; 1603 struct componentname *a_cnp; 1604 struct vattr *a_vap; 1605 } */ *ap = v; 1606 struct vnode *dvp = ap->a_dvp; 1607 struct vattr *vap = ap->a_vap; 1608 struct componentname *cnp = ap->a_cnp; 1609 struct nfsv2_sattr *sp; 1610 u_int32_t *tl; 1611 char *cp; 1612 int32_t t1, t2; 1613 struct nfsnode *dnp, *np = (struct nfsnode *)0; 1614 struct vnode *newvp = (struct vnode *)0; 1615 char *bpos, *dpos, *cp2; 1616 int error, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1617 struct mbuf *mreq, *mrep, *md, *mb; 1618 const int v3 = NFS_ISV3(dvp); 1619 u_int32_t excl_mode = NFSV3CREATE_UNCHECKED; 1620 1621 /* 1622 * Oops, not for me.. 1623 */ 1624 if (vap->va_type == VSOCK) 1625 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1626 1627 KASSERT(vap->va_type == VREG); 1628 1629 #ifdef VA_EXCLUSIVE 1630 if (vap->va_vaflags & VA_EXCLUSIVE) { 1631 excl_mode = NFSV3CREATE_EXCLUSIVE; 1632 } 1633 #endif 1634 again: 1635 error = 0; 1636 nfsstats.rpccnt[NFSPROC_CREATE]++; 1637 dnp = VTONFS(dvp); 1638 nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1639 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1640 nfsm_fhtom(dnp, v3); 1641 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1642 #ifndef NFS_V2_ONLY 1643 if (v3) { 1644 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1645 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1646 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1647 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1648 *tl++ = cprng_fast32(); 1649 *tl = cprng_fast32(); 1650 } else { 1651 *tl = txdr_unsigned(excl_mode); 1652 nfsm_v3attrbuild(vap, false); 1653 } 1654 } else 1655 #endif 1656 { 1657 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1658 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1659 sp->sa_uid = nfs_xdrneg1; 1660 sp->sa_gid = nfs_xdrneg1; 1661 sp->sa_size = 0; 1662 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1663 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1664 } 1665 nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred); 1666 if (!error) { 1667 nfsm_mtofh(dvp, newvp, v3, gotvp); 1668 if (!gotvp) { 1669 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1670 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1671 if (!error) 1672 newvp = NFSTOV(np); 1673 } 1674 } 1675 #ifndef NFS_V2_ONLY 1676 if (v3) 1677 nfsm_wcc_data(dvp, wccflag, 0, !error); 1678 #endif 1679 nfsm_reqdone; 1680 if (error) { 1681 /* 1682 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 1683 */ 1684 if (v3 && error == ENOTSUP) { 1685 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1686 excl_mode = NFSV3CREATE_GUARDED; 1687 goto again; 1688 } else if (excl_mode == NFSV3CREATE_GUARDED) { 1689 excl_mode = NFSV3CREATE_UNCHECKED; 1690 goto again; 1691 } 1692 } 1693 } else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) { 1694 struct timespec ts; 1695 1696 getnanotime(&ts); 1697 1698 /* 1699 * make sure that we'll update timestamps as 1700 * most server implementations use them to store 1701 * the create verifier. 1702 * 1703 * XXX it's better to use TOSERVER always. 1704 */ 1705 1706 if (vap->va_atime.tv_sec == VNOVAL) 1707 vap->va_atime = ts; 1708 if (vap->va_mtime.tv_sec == VNOVAL) 1709 vap->va_mtime = ts; 1710 1711 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp); 1712 } 1713 if (error == 0) { 1714 if (cnp->cn_flags & MAKEENTRY) 1715 nfs_cache_enter(dvp, newvp, cnp); 1716 else 1717 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1718 *ap->a_vpp = newvp; 1719 VOP_UNLOCK(newvp); 1720 } else { 1721 if (newvp) 1722 vput(newvp); 1723 if (error == EEXIST) 1724 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1725 } 1726 VTONFS(dvp)->n_flag |= NMODIFIED; 1727 if (!wccflag) 1728 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1729 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1730 return (error); 1731 } 1732 1733 /* 1734 * nfs file remove call 1735 * To try and make nfs semantics closer to ufs semantics, a file that has 1736 * other processes using the vnode is renamed instead of removed and then 1737 * removed later on the last close. 1738 * - If vrefcnt(vp) > 1 1739 * If a rename is not already in the works 1740 * call nfs_sillyrename() to set it up 1741 * else 1742 * do the remove rpc 1743 */ 1744 int 1745 nfs_remove(void *v) 1746 { 1747 struct vop_remove_v2_args /* { 1748 struct vnodeop_desc *a_desc; 1749 struct vnode * a_dvp; 1750 struct vnode * a_vp; 1751 struct componentname * a_cnp; 1752 } */ *ap = v; 1753 struct vnode *vp = ap->a_vp; 1754 struct vnode *dvp = ap->a_dvp; 1755 struct componentname *cnp = ap->a_cnp; 1756 struct nfsnode *np = VTONFS(vp); 1757 int error = 0; 1758 struct vattr vattr; 1759 1760 #ifndef DIAGNOSTIC 1761 if (vrefcnt(vp) < 1) 1762 panic("nfs_remove: bad vrefcnt(vp)"); 1763 #endif 1764 if (vp->v_type == VDIR) 1765 error = EPERM; 1766 else if (vrefcnt(vp) == 1 || (np->n_sillyrename && 1767 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1768 vattr.va_nlink > 1)) { 1769 /* 1770 * Purge the name cache so that the chance of a lookup for 1771 * the name succeeding while the remove is in progress is 1772 * minimized. Without node locking it can still happen, such 1773 * that an I/O op returns ESTALE, but since you get this if 1774 * another host removes the file.. 1775 */ 1776 cache_purge(vp); 1777 /* 1778 * throw away biocache buffers, mainly to avoid 1779 * unnecessary delayed writes later. 1780 */ 1781 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1782 /* Do the rpc */ 1783 if (error != EINTR) 1784 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1785 cnp->cn_namelen, cnp->cn_cred, curlwp); 1786 } else if (!np->n_sillyrename) 1787 error = nfs_sillyrename(dvp, vp, cnp, false); 1788 if (!error && nfs_getattrcache(vp, &vattr) == 0 && 1789 vattr.va_nlink == 1) { 1790 np->n_flag |= NREMOVED; 1791 } 1792 NFS_INVALIDATE_ATTRCACHE(np); 1793 VN_KNOTE(vp, NOTE_DELETE); 1794 VN_KNOTE(dvp, NOTE_WRITE); 1795 if (dvp == vp) 1796 vrele(vp); 1797 else 1798 vput(vp); 1799 return (error); 1800 } 1801 1802 /* 1803 * nfs file remove rpc called from nfs_inactive 1804 */ 1805 int 1806 nfs_removeit(struct sillyrename *sp) 1807 { 1808 1809 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1810 (struct lwp *)0)); 1811 } 1812 1813 /* 1814 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1815 */ 1816 int 1817 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l) 1818 { 1819 u_int32_t *tl; 1820 char *cp; 1821 #ifndef NFS_V2_ONLY 1822 int32_t t1; 1823 char *cp2; 1824 #endif 1825 int32_t t2; 1826 char *bpos, *dpos; 1827 int error = 0, wccflag = NFSV3_WCCRATTR; 1828 struct mbuf *mreq, *mrep, *md, *mb; 1829 const int v3 = NFS_ISV3(dvp); 1830 int rexmit = 0; 1831 struct nfsnode *dnp = VTONFS(dvp); 1832 1833 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1834 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1835 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1836 nfsm_fhtom(dnp, v3); 1837 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1838 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1839 #ifndef NFS_V2_ONLY 1840 if (v3) 1841 nfsm_wcc_data(dvp, wccflag, 0, !error); 1842 #endif 1843 nfsm_reqdone; 1844 VTONFS(dvp)->n_flag |= NMODIFIED; 1845 if (!wccflag) 1846 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1847 /* 1848 * Kludge City: If the first reply to the remove rpc is lost.. 1849 * the reply to the retransmitted request will be ENOENT 1850 * since the file was in fact removed 1851 * Therefore, we cheat and return success. 1852 */ 1853 if (rexmit && error == ENOENT) 1854 error = 0; 1855 return (error); 1856 } 1857 1858 /* 1859 * nfs file rename call 1860 */ 1861 int 1862 nfs_rename(void *v) 1863 { 1864 struct vop_rename_args /* { 1865 struct vnode *a_fdvp; 1866 struct vnode *a_fvp; 1867 struct componentname *a_fcnp; 1868 struct vnode *a_tdvp; 1869 struct vnode *a_tvp; 1870 struct componentname *a_tcnp; 1871 } */ *ap = v; 1872 struct vnode *fvp = ap->a_fvp; 1873 struct vnode *tvp = ap->a_tvp; 1874 struct vnode *fdvp = ap->a_fdvp; 1875 struct vnode *tdvp = ap->a_tdvp; 1876 struct componentname *tcnp = ap->a_tcnp; 1877 struct componentname *fcnp = ap->a_fcnp; 1878 int error; 1879 1880 /* Check for cross-device rename */ 1881 if ((fvp->v_mount != tdvp->v_mount) || 1882 (tvp && (fvp->v_mount != tvp->v_mount))) { 1883 error = EXDEV; 1884 goto out; 1885 } 1886 1887 /* 1888 * If the tvp exists and is in use, sillyrename it before doing the 1889 * rename of the new file over it. 1890 * 1891 * Have sillyrename use link instead of rename if possible, 1892 * so that we don't lose the file if the rename fails, and so 1893 * that there's no window when the "to" file doesn't exist. 1894 */ 1895 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 1896 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1897 VN_KNOTE(tvp, NOTE_DELETE); 1898 vput(tvp); 1899 tvp = NULL; 1900 } 1901 1902 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1903 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1904 curlwp); 1905 1906 VN_KNOTE(fdvp, NOTE_WRITE); 1907 VN_KNOTE(tdvp, NOTE_WRITE); 1908 if (error == 0 || error == EEXIST) { 1909 if (fvp->v_type == VDIR) 1910 cache_purge(fvp); 1911 else 1912 cache_purge1(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1913 0); 1914 if (tvp != NULL && tvp->v_type == VDIR) 1915 cache_purge(tvp); 1916 else 1917 cache_purge1(tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, 1918 0); 1919 } 1920 out: 1921 if (tdvp == tvp) 1922 vrele(tdvp); 1923 else 1924 vput(tdvp); 1925 if (tvp) 1926 vput(tvp); 1927 vrele(fdvp); 1928 vrele(fvp); 1929 return (error); 1930 } 1931 1932 /* 1933 * nfs file rename rpc called from nfs_remove() above 1934 */ 1935 int 1936 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp) 1937 { 1938 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1939 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 1940 } 1941 1942 /* 1943 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1944 */ 1945 int 1946 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) 1947 { 1948 u_int32_t *tl; 1949 char *cp; 1950 #ifndef NFS_V2_ONLY 1951 int32_t t1; 1952 char *cp2; 1953 #endif 1954 int32_t t2; 1955 char *bpos, *dpos; 1956 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1957 struct mbuf *mreq, *mrep, *md, *mb; 1958 const int v3 = NFS_ISV3(fdvp); 1959 int rexmit = 0; 1960 struct nfsnode *fdnp = VTONFS(fdvp); 1961 1962 nfsstats.rpccnt[NFSPROC_RENAME]++; 1963 nfsm_reqhead(fdnp, NFSPROC_RENAME, 1964 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1965 nfsm_rndup(tnamelen)); 1966 nfsm_fhtom(fdnp, v3); 1967 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1968 nfsm_fhtom(VTONFS(tdvp), v3); 1969 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1970 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 1971 #ifndef NFS_V2_ONLY 1972 if (v3) { 1973 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 1974 nfsm_wcc_data(tdvp, twccflag, 0, !error); 1975 } 1976 #endif 1977 nfsm_reqdone; 1978 VTONFS(fdvp)->n_flag |= NMODIFIED; 1979 VTONFS(tdvp)->n_flag |= NMODIFIED; 1980 if (!fwccflag) 1981 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 1982 if (!twccflag) 1983 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 1984 /* 1985 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1986 */ 1987 if (rexmit && error == ENOENT) 1988 error = 0; 1989 return (error); 1990 } 1991 1992 /* 1993 * NFS link RPC, called from nfs_link. 1994 * Assumes dvp and vp locked, and leaves them that way. 1995 */ 1996 1997 static int 1998 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 1999 size_t namelen, kauth_cred_t cred, struct lwp *l) 2000 { 2001 u_int32_t *tl; 2002 char *cp; 2003 #ifndef NFS_V2_ONLY 2004 int32_t t1; 2005 char *cp2; 2006 #endif 2007 int32_t t2; 2008 char *bpos, *dpos; 2009 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2010 struct mbuf *mreq, *mrep, *md, *mb; 2011 const int v3 = NFS_ISV3(dvp); 2012 int rexmit = 0; 2013 struct nfsnode *np = VTONFS(vp); 2014 2015 nfsstats.rpccnt[NFSPROC_LINK]++; 2016 nfsm_reqhead(np, NFSPROC_LINK, 2017 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 2018 nfsm_fhtom(np, v3); 2019 nfsm_fhtom(VTONFS(dvp), v3); 2020 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 2021 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 2022 #ifndef NFS_V2_ONLY 2023 if (v3) { 2024 nfsm_postop_attr(vp, attrflag, 0); 2025 nfsm_wcc_data(dvp, wccflag, 0, !error); 2026 } 2027 #endif 2028 nfsm_reqdone; 2029 2030 VTONFS(dvp)->n_flag |= NMODIFIED; 2031 if (!attrflag) 2032 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 2033 if (!wccflag) 2034 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2035 2036 /* 2037 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2038 */ 2039 if (rexmit && error == EEXIST) 2040 error = 0; 2041 2042 return error; 2043 } 2044 2045 /* 2046 * nfs hard link create call 2047 */ 2048 int 2049 nfs_link(void *v) 2050 { 2051 struct vop_link_v2_args /* { 2052 struct vnode *a_dvp; 2053 struct vnode *a_vp; 2054 struct componentname *a_cnp; 2055 } */ *ap = v; 2056 struct vnode *vp = ap->a_vp; 2057 struct vnode *dvp = ap->a_dvp; 2058 struct componentname *cnp = ap->a_cnp; 2059 int error = 0; 2060 2061 error = vn_lock(vp, LK_EXCLUSIVE); 2062 if (error != 0) { 2063 VOP_ABORTOP(dvp, cnp); 2064 return error; 2065 } 2066 2067 /* 2068 * Push all writes to the server, so that the attribute cache 2069 * doesn't get "out of sync" with the server. 2070 * XXX There should be a better way! 2071 */ 2072 VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0); 2073 2074 error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2075 cnp->cn_cred, curlwp); 2076 2077 if (error == 0) { 2078 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2079 } 2080 VOP_UNLOCK(vp); 2081 VN_KNOTE(vp, NOTE_LINK); 2082 VN_KNOTE(dvp, NOTE_WRITE); 2083 return (error); 2084 } 2085 2086 /* 2087 * nfs symbolic link create call 2088 */ 2089 int 2090 nfs_symlink(void *v) 2091 { 2092 struct vop_symlink_v3_args /* { 2093 struct vnode *a_dvp; 2094 struct vnode **a_vpp; 2095 struct componentname *a_cnp; 2096 struct vattr *a_vap; 2097 char *a_target; 2098 } */ *ap = v; 2099 struct vnode *dvp = ap->a_dvp; 2100 struct vattr *vap = ap->a_vap; 2101 struct componentname *cnp = ap->a_cnp; 2102 struct nfsv2_sattr *sp; 2103 u_int32_t *tl; 2104 char *cp; 2105 int32_t t1, t2; 2106 char *bpos, *dpos, *cp2; 2107 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2108 struct mbuf *mreq, *mrep, *md, *mb; 2109 struct vnode *newvp = (struct vnode *)0; 2110 const int v3 = NFS_ISV3(dvp); 2111 int rexmit = 0; 2112 struct nfsnode *dnp = VTONFS(dvp); 2113 2114 *ap->a_vpp = NULL; 2115 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2116 slen = strlen(ap->a_target); 2117 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2118 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2119 nfsm_fhtom(dnp, v3); 2120 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2121 #ifndef NFS_V2_ONlY 2122 if (v3) 2123 nfsm_v3attrbuild(vap, false); 2124 #endif 2125 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2126 #ifndef NFS_V2_ONlY 2127 if (!v3) { 2128 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2129 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2130 sp->sa_uid = nfs_xdrneg1; 2131 sp->sa_gid = nfs_xdrneg1; 2132 sp->sa_size = nfs_xdrneg1; 2133 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2134 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2135 } 2136 #endif 2137 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2138 &rexmit); 2139 #ifndef NFS_V2_ONlY 2140 if (v3) { 2141 if (!error) 2142 nfsm_mtofh(dvp, newvp, v3, gotvp); 2143 nfsm_wcc_data(dvp, wccflag, 0, !error); 2144 } 2145 #endif 2146 nfsm_reqdone; 2147 /* 2148 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2149 */ 2150 if (rexmit && error == EEXIST) 2151 error = 0; 2152 if (error == 0 || error == EEXIST) 2153 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2154 if (error == 0 && newvp == NULL) { 2155 struct nfsnode *np = NULL; 2156 2157 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2158 cnp->cn_cred, curlwp, &np); 2159 if (error == 0) 2160 newvp = NFSTOV(np); 2161 } 2162 if (error) { 2163 if (newvp != NULL) 2164 vput(newvp); 2165 } else { 2166 *ap->a_vpp = newvp; 2167 VOP_UNLOCK(newvp); 2168 } 2169 VTONFS(dvp)->n_flag |= NMODIFIED; 2170 if (!wccflag) 2171 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2172 VN_KNOTE(dvp, NOTE_WRITE); 2173 return (error); 2174 } 2175 2176 /* 2177 * nfs make dir call 2178 */ 2179 int 2180 nfs_mkdir(void *v) 2181 { 2182 struct vop_mkdir_v3_args /* { 2183 struct vnode *a_dvp; 2184 struct vnode **a_vpp; 2185 struct componentname *a_cnp; 2186 struct vattr *a_vap; 2187 } */ *ap = v; 2188 struct vnode *dvp = ap->a_dvp; 2189 struct vattr *vap = ap->a_vap; 2190 struct componentname *cnp = ap->a_cnp; 2191 struct nfsv2_sattr *sp; 2192 u_int32_t *tl; 2193 char *cp; 2194 int32_t t1, t2; 2195 int len; 2196 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2197 struct vnode *newvp = (struct vnode *)0; 2198 char *bpos, *dpos, *cp2; 2199 int error = 0, wccflag = NFSV3_WCCRATTR; 2200 int gotvp = 0; 2201 int rexmit = 0; 2202 struct mbuf *mreq, *mrep, *md, *mb; 2203 const int v3 = NFS_ISV3(dvp); 2204 2205 len = cnp->cn_namelen; 2206 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2207 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2208 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2209 nfsm_fhtom(dnp, v3); 2210 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2211 #ifndef NFS_V2_ONLY 2212 if (v3) { 2213 nfsm_v3attrbuild(vap, false); 2214 } else 2215 #endif 2216 { 2217 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2218 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2219 sp->sa_uid = nfs_xdrneg1; 2220 sp->sa_gid = nfs_xdrneg1; 2221 sp->sa_size = nfs_xdrneg1; 2222 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2223 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2224 } 2225 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2226 if (!error) 2227 nfsm_mtofh(dvp, newvp, v3, gotvp); 2228 if (v3) 2229 nfsm_wcc_data(dvp, wccflag, 0, !error); 2230 nfsm_reqdone; 2231 VTONFS(dvp)->n_flag |= NMODIFIED; 2232 if (!wccflag) 2233 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2234 /* 2235 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2236 * if we can succeed in looking up the directory. 2237 */ 2238 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2239 if (newvp) { 2240 vput(newvp); 2241 newvp = (struct vnode *)0; 2242 } 2243 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2244 curlwp, &np); 2245 if (!error) { 2246 newvp = NFSTOV(np); 2247 if (newvp->v_type != VDIR || newvp == dvp) 2248 error = EEXIST; 2249 } 2250 } 2251 if (error) { 2252 if (newvp) { 2253 if (dvp != newvp) 2254 vput(newvp); 2255 else 2256 vrele(newvp); 2257 } 2258 } else { 2259 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2260 nfs_cache_enter(dvp, newvp, cnp); 2261 *ap->a_vpp = newvp; 2262 VOP_UNLOCK(newvp); 2263 } 2264 return (error); 2265 } 2266 2267 /* 2268 * nfs remove directory call 2269 */ 2270 int 2271 nfs_rmdir(void *v) 2272 { 2273 struct vop_rmdir_v2_args /* { 2274 struct vnode *a_dvp; 2275 struct vnode *a_vp; 2276 struct componentname *a_cnp; 2277 } */ *ap = v; 2278 struct vnode *vp = ap->a_vp; 2279 struct vnode *dvp = ap->a_dvp; 2280 struct componentname *cnp = ap->a_cnp; 2281 u_int32_t *tl; 2282 char *cp; 2283 #ifndef NFS_V2_ONLY 2284 int32_t t1; 2285 char *cp2; 2286 #endif 2287 int32_t t2; 2288 char *bpos, *dpos; 2289 int error = 0, wccflag = NFSV3_WCCRATTR; 2290 int rexmit = 0; 2291 struct mbuf *mreq, *mrep, *md, *mb; 2292 const int v3 = NFS_ISV3(dvp); 2293 struct nfsnode *dnp; 2294 2295 if (dvp == vp) { 2296 vrele(vp); 2297 return (EINVAL); 2298 } 2299 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2300 dnp = VTONFS(dvp); 2301 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2302 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2303 nfsm_fhtom(dnp, v3); 2304 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2305 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2306 #ifndef NFS_V2_ONLY 2307 if (v3) 2308 nfsm_wcc_data(dvp, wccflag, 0, !error); 2309 #endif 2310 nfsm_reqdone; 2311 VTONFS(dvp)->n_flag |= NMODIFIED; 2312 if (!wccflag) 2313 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2314 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2315 VN_KNOTE(vp, NOTE_DELETE); 2316 cache_purge(vp); 2317 vput(vp); 2318 /* 2319 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2320 */ 2321 if (rexmit && error == ENOENT) 2322 error = 0; 2323 return (error); 2324 } 2325 2326 /* 2327 * nfs readdir call 2328 */ 2329 int 2330 nfs_readdir(void *v) 2331 { 2332 struct vop_readdir_args /* { 2333 struct vnode *a_vp; 2334 struct uio *a_uio; 2335 kauth_cred_t a_cred; 2336 int *a_eofflag; 2337 off_t **a_cookies; 2338 int *a_ncookies; 2339 } */ *ap = v; 2340 struct vnode *vp = ap->a_vp; 2341 struct uio *uio = ap->a_uio; 2342 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2343 char *base = uio->uio_iov->iov_base; 2344 int tresid, error; 2345 size_t count, lost; 2346 struct dirent *dp; 2347 off_t *cookies = NULL; 2348 int ncookies = 0, nc; 2349 2350 if (vp->v_type != VDIR) 2351 return (EPERM); 2352 2353 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2354 count = uio->uio_resid - lost; 2355 if (count <= 0) 2356 return (EINVAL); 2357 2358 /* 2359 * Call nfs_bioread() to do the real work. 2360 */ 2361 tresid = uio->uio_resid = count; 2362 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2363 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2364 2365 if (!error && ap->a_cookies) { 2366 ncookies = count / 16; 2367 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2368 *ap->a_cookies = cookies; 2369 } 2370 2371 if (!error && uio->uio_resid == tresid) { 2372 uio->uio_resid += lost; 2373 nfsstats.direofcache_misses++; 2374 if (ap->a_cookies) 2375 *ap->a_ncookies = 0; 2376 *ap->a_eofflag = 1; 2377 return (0); 2378 } 2379 2380 if (!error && ap->a_cookies) { 2381 /* 2382 * Only the NFS server and emulations use cookies, and they 2383 * load the directory block into system space, so we can 2384 * just look at it directly. 2385 */ 2386 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2387 uio->uio_iovcnt != 1) 2388 panic("nfs_readdir: lost in space"); 2389 for (nc = 0; ncookies-- && 2390 base < (char *)uio->uio_iov->iov_base; nc++){ 2391 dp = (struct dirent *) base; 2392 if (dp->d_reclen == 0) 2393 break; 2394 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2395 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2396 else 2397 *(cookies++) = NFS_GETCOOKIE(dp); 2398 base += dp->d_reclen; 2399 } 2400 uio->uio_resid += 2401 ((char *)uio->uio_iov->iov_base - base); 2402 uio->uio_iov->iov_len += 2403 ((char *)uio->uio_iov->iov_base - base); 2404 uio->uio_iov->iov_base = base; 2405 *ap->a_ncookies = nc; 2406 } 2407 2408 uio->uio_resid += lost; 2409 *ap->a_eofflag = 0; 2410 return (error); 2411 } 2412 2413 /* 2414 * Readdir rpc call. 2415 * Called from below the buffer cache by nfs_doio(). 2416 */ 2417 int 2418 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2419 { 2420 int len, left; 2421 struct dirent *dp = NULL; 2422 u_int32_t *tl; 2423 char *cp; 2424 int32_t t1, t2; 2425 char *bpos, *dpos, *cp2; 2426 struct mbuf *mreq, *mrep, *md, *mb; 2427 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2428 struct nfsnode *dnp = VTONFS(vp); 2429 u_quad_t fileno; 2430 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2431 #ifndef NFS_V2_ONLY 2432 int attrflag; 2433 #endif 2434 int nrpcs = 0, reclen; 2435 const int v3 = NFS_ISV3(vp); 2436 2437 #ifdef DIAGNOSTIC 2438 /* 2439 * Should be called from buffer cache, so only amount of 2440 * NFS_DIRBLKSIZ will be requested. 2441 */ 2442 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2443 panic("nfs readdirrpc bad uio"); 2444 #endif 2445 2446 /* 2447 * Loop around doing readdir rpc's of size nm_readdirsize 2448 * truncated to a multiple of NFS_DIRFRAGSIZ. 2449 * The stopping criteria is EOF or buffer full. 2450 */ 2451 while (more_dirs && bigenough) { 2452 /* 2453 * Heuristic: don't bother to do another RPC to further 2454 * fill up this block if there is not much room left. (< 50% 2455 * of the readdir RPC size). This wastes some buffer space 2456 * but can save up to 50% in RPC calls. 2457 */ 2458 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2459 bigenough = 0; 2460 break; 2461 } 2462 nfsstats.rpccnt[NFSPROC_READDIR]++; 2463 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2464 NFSX_READDIR(v3)); 2465 nfsm_fhtom(dnp, v3); 2466 #ifndef NFS_V2_ONLY 2467 if (v3) { 2468 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2469 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2470 txdr_swapcookie3(uiop->uio_offset, tl); 2471 } else { 2472 txdr_cookie3(uiop->uio_offset, tl); 2473 } 2474 tl += 2; 2475 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2476 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2477 } else 2478 #endif 2479 { 2480 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2481 *tl++ = txdr_unsigned(uiop->uio_offset); 2482 } 2483 *tl = txdr_unsigned(nmp->nm_readdirsize); 2484 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2485 nrpcs++; 2486 #ifndef NFS_V2_ONLY 2487 if (v3) { 2488 nfsm_postop_attr(vp, attrflag, 0); 2489 if (!error) { 2490 nfsm_dissect(tl, u_int32_t *, 2491 2 * NFSX_UNSIGNED); 2492 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2493 dnp->n_cookieverf.nfsuquad[1] = *tl; 2494 } else { 2495 m_freem(mrep); 2496 goto nfsmout; 2497 } 2498 } 2499 #endif 2500 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2501 more_dirs = fxdr_unsigned(int, *tl); 2502 2503 /* loop thru the dir entries, doctoring them to 4bsd form */ 2504 while (more_dirs && bigenough) { 2505 #ifndef NFS_V2_ONLY 2506 if (v3) { 2507 nfsm_dissect(tl, u_int32_t *, 2508 3 * NFSX_UNSIGNED); 2509 fileno = fxdr_hyper(tl); 2510 len = fxdr_unsigned(int, *(tl + 2)); 2511 } else 2512 #endif 2513 { 2514 nfsm_dissect(tl, u_int32_t *, 2515 2 * NFSX_UNSIGNED); 2516 fileno = fxdr_unsigned(u_quad_t, *tl++); 2517 len = fxdr_unsigned(int, *tl); 2518 } 2519 if (len <= 0 || len > NFS_MAXNAMLEN) { 2520 error = EBADRPC; 2521 m_freem(mrep); 2522 goto nfsmout; 2523 } 2524 /* for cookie stashing */ 2525 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2526 left = NFS_DIRFRAGSIZ - blksiz; 2527 if (reclen > left) { 2528 memset(uiop->uio_iov->iov_base, 0, left); 2529 dp->d_reclen += left; 2530 UIO_ADVANCE(uiop, left); 2531 blksiz = 0; 2532 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2533 } 2534 if (reclen > uiop->uio_resid) 2535 bigenough = 0; 2536 if (bigenough) { 2537 int tlen; 2538 2539 dp = (struct dirent *)uiop->uio_iov->iov_base; 2540 dp->d_fileno = fileno; 2541 dp->d_namlen = len; 2542 dp->d_reclen = reclen; 2543 dp->d_type = DT_UNKNOWN; 2544 blksiz += reclen; 2545 if (blksiz == NFS_DIRFRAGSIZ) 2546 blksiz = 0; 2547 UIO_ADVANCE(uiop, DIRHDSIZ); 2548 nfsm_mtouio(uiop, len); 2549 tlen = reclen - (DIRHDSIZ + len); 2550 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2551 UIO_ADVANCE(uiop, tlen); 2552 } else 2553 nfsm_adv(nfsm_rndup(len)); 2554 #ifndef NFS_V2_ONLY 2555 if (v3) { 2556 nfsm_dissect(tl, u_int32_t *, 2557 3 * NFSX_UNSIGNED); 2558 } else 2559 #endif 2560 { 2561 nfsm_dissect(tl, u_int32_t *, 2562 2 * NFSX_UNSIGNED); 2563 } 2564 if (bigenough) { 2565 #ifndef NFS_V2_ONLY 2566 if (v3) { 2567 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2568 uiop->uio_offset = 2569 fxdr_swapcookie3(tl); 2570 else 2571 uiop->uio_offset = 2572 fxdr_cookie3(tl); 2573 } 2574 else 2575 #endif 2576 { 2577 uiop->uio_offset = 2578 fxdr_unsigned(off_t, *tl); 2579 } 2580 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2581 } 2582 if (v3) 2583 tl += 2; 2584 else 2585 tl++; 2586 more_dirs = fxdr_unsigned(int, *tl); 2587 } 2588 /* 2589 * If at end of rpc data, get the eof boolean 2590 */ 2591 if (!more_dirs) { 2592 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2593 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2594 2595 /* 2596 * kludge: if we got no entries, treat it as EOF. 2597 * some server sometimes send a reply without any 2598 * entries or EOF. 2599 * although it might mean the server has very long name, 2600 * we can't handle such entries anyway. 2601 */ 2602 2603 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2604 more_dirs = 0; 2605 } 2606 m_freem(mrep); 2607 } 2608 /* 2609 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2610 * by increasing d_reclen for the last record. 2611 */ 2612 if (blksiz > 0) { 2613 left = NFS_DIRFRAGSIZ - blksiz; 2614 memset(uiop->uio_iov->iov_base, 0, left); 2615 dp->d_reclen += left; 2616 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2617 UIO_ADVANCE(uiop, left); 2618 } 2619 2620 /* 2621 * We are now either at the end of the directory or have filled the 2622 * block. 2623 */ 2624 if (bigenough) { 2625 dnp->n_direofoffset = uiop->uio_offset; 2626 dnp->n_flag |= NEOFVALID; 2627 } 2628 nfsmout: 2629 return (error); 2630 } 2631 2632 #ifndef NFS_V2_ONLY 2633 /* 2634 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2635 */ 2636 int 2637 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2638 { 2639 int len, left; 2640 struct dirent *dp = NULL; 2641 u_int32_t *tl; 2642 char *cp; 2643 int32_t t1, t2; 2644 struct vnode *newvp; 2645 char *bpos, *dpos, *cp2; 2646 struct mbuf *mreq, *mrep, *md, *mb; 2647 struct nameidata nami, *ndp = &nami; 2648 struct componentname *cnp = &ndp->ni_cnd; 2649 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2650 struct nfsnode *dnp = VTONFS(vp), *np; 2651 nfsfh_t *fhp; 2652 u_quad_t fileno; 2653 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2654 int attrflag, fhsize, nrpcs = 0, reclen; 2655 struct nfs_fattr fattr, *fp; 2656 2657 #ifdef DIAGNOSTIC 2658 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2659 panic("nfs readdirplusrpc bad uio"); 2660 #endif 2661 ndp->ni_dvp = vp; 2662 newvp = NULLVP; 2663 2664 /* 2665 * Loop around doing readdir rpc's of size nm_readdirsize 2666 * truncated to a multiple of NFS_DIRFRAGSIZ. 2667 * The stopping criteria is EOF or buffer full. 2668 */ 2669 while (more_dirs && bigenough) { 2670 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2671 bigenough = 0; 2672 break; 2673 } 2674 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2675 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2676 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2677 nfsm_fhtom(dnp, 1); 2678 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2679 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2680 txdr_swapcookie3(uiop->uio_offset, tl); 2681 } else { 2682 txdr_cookie3(uiop->uio_offset, tl); 2683 } 2684 tl += 2; 2685 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2686 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2687 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2688 *tl = txdr_unsigned(nmp->nm_rsize); 2689 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2690 nfsm_postop_attr(vp, attrflag, 0); 2691 if (error) { 2692 m_freem(mrep); 2693 goto nfsmout; 2694 } 2695 nrpcs++; 2696 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2697 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2698 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2699 more_dirs = fxdr_unsigned(int, *tl); 2700 2701 /* loop thru the dir entries, doctoring them to 4bsd form */ 2702 while (more_dirs && bigenough) { 2703 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2704 fileno = fxdr_hyper(tl); 2705 len = fxdr_unsigned(int, *(tl + 2)); 2706 if (len <= 0 || len > NFS_MAXNAMLEN) { 2707 error = EBADRPC; 2708 m_freem(mrep); 2709 goto nfsmout; 2710 } 2711 /* for cookie stashing */ 2712 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2713 left = NFS_DIRFRAGSIZ - blksiz; 2714 if (reclen > left) { 2715 /* 2716 * DIRFRAGSIZ is aligned, no need to align 2717 * again here. 2718 */ 2719 memset(uiop->uio_iov->iov_base, 0, left); 2720 dp->d_reclen += left; 2721 UIO_ADVANCE(uiop, left); 2722 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2723 blksiz = 0; 2724 } 2725 if (reclen > uiop->uio_resid) 2726 bigenough = 0; 2727 if (bigenough) { 2728 int tlen; 2729 2730 dp = (struct dirent *)uiop->uio_iov->iov_base; 2731 dp->d_fileno = fileno; 2732 dp->d_namlen = len; 2733 dp->d_reclen = reclen; 2734 dp->d_type = DT_UNKNOWN; 2735 blksiz += reclen; 2736 if (blksiz == NFS_DIRFRAGSIZ) 2737 blksiz = 0; 2738 UIO_ADVANCE(uiop, DIRHDSIZ); 2739 nfsm_mtouio(uiop, len); 2740 tlen = reclen - (DIRHDSIZ + len); 2741 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2742 UIO_ADVANCE(uiop, tlen); 2743 cnp->cn_nameptr = dp->d_name; 2744 cnp->cn_namelen = dp->d_namlen; 2745 } else 2746 nfsm_adv(nfsm_rndup(len)); 2747 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2748 if (bigenough) { 2749 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2750 uiop->uio_offset = 2751 fxdr_swapcookie3(tl); 2752 else 2753 uiop->uio_offset = 2754 fxdr_cookie3(tl); 2755 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2756 } 2757 tl += 2; 2758 2759 /* 2760 * Since the attributes are before the file handle 2761 * (sigh), we must skip over the attributes and then 2762 * come back and get them. 2763 */ 2764 attrflag = fxdr_unsigned(int, *tl); 2765 if (attrflag) { 2766 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2767 memcpy(&fattr, fp, NFSX_V3FATTR); 2768 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2769 doit = fxdr_unsigned(int, *tl); 2770 if (doit) { 2771 nfsm_getfh(fhp, fhsize, 1); 2772 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2773 vref(vp); 2774 newvp = vp; 2775 np = dnp; 2776 } else { 2777 error = nfs_nget1(vp->v_mount, fhp, 2778 fhsize, &np, LK_NOWAIT); 2779 if (!error) 2780 newvp = NFSTOV(np); 2781 } 2782 if (!error) { 2783 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2784 if (bigenough) { 2785 dp->d_type = 2786 IFTODT(VTTOIF(np->n_vattr->va_type)); 2787 ndp->ni_vp = newvp; 2788 nfs_cache_enter(ndp->ni_dvp, 2789 ndp->ni_vp, cnp); 2790 } 2791 } 2792 error = 0; 2793 } 2794 } else { 2795 /* Just skip over the file handle */ 2796 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2797 i = fxdr_unsigned(int, *tl); 2798 nfsm_adv(nfsm_rndup(i)); 2799 } 2800 if (newvp != NULLVP) { 2801 if (newvp == vp) 2802 vrele(newvp); 2803 else 2804 vput(newvp); 2805 newvp = NULLVP; 2806 } 2807 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2808 more_dirs = fxdr_unsigned(int, *tl); 2809 } 2810 /* 2811 * If at end of rpc data, get the eof boolean 2812 */ 2813 if (!more_dirs) { 2814 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2815 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2816 2817 /* 2818 * kludge: see a comment in nfs_readdirrpc. 2819 */ 2820 2821 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2822 more_dirs = 0; 2823 } 2824 m_freem(mrep); 2825 } 2826 /* 2827 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2828 * by increasing d_reclen for the last record. 2829 */ 2830 if (blksiz > 0) { 2831 left = NFS_DIRFRAGSIZ - blksiz; 2832 memset(uiop->uio_iov->iov_base, 0, left); 2833 dp->d_reclen += left; 2834 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2835 UIO_ADVANCE(uiop, left); 2836 } 2837 2838 /* 2839 * We are now either at the end of the directory or have filled the 2840 * block. 2841 */ 2842 if (bigenough) { 2843 dnp->n_direofoffset = uiop->uio_offset; 2844 dnp->n_flag |= NEOFVALID; 2845 } 2846 nfsmout: 2847 if (newvp != NULLVP) { 2848 if(newvp == vp) 2849 vrele(newvp); 2850 else 2851 vput(newvp); 2852 } 2853 return (error); 2854 } 2855 #endif 2856 2857 /* 2858 * Silly rename. To make the NFS filesystem that is stateless look a little 2859 * more like the "ufs" a remove of an active vnode is translated to a rename 2860 * to a funny looking filename that is removed by nfs_inactive on the 2861 * nfsnode. There is the potential for another process on a different client 2862 * to create the same funny name between the nfs_lookitup() fails and the 2863 * nfs_rename() completes, but... 2864 */ 2865 int 2866 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink) 2867 { 2868 struct sillyrename *sp; 2869 struct nfsnode *np; 2870 int error; 2871 pid_t pid; 2872 2873 cache_purge(dvp); 2874 np = VTONFS(vp); 2875 #ifndef DIAGNOSTIC 2876 if (vp->v_type == VDIR) 2877 panic("nfs: sillyrename dir"); 2878 #endif 2879 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2880 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2881 sp->s_dvp = dvp; 2882 vref(dvp); 2883 2884 /* Fudge together a funny name */ 2885 pid = curlwp->l_proc->p_pid; 2886 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 2887 sp->s_namlen = 12; 2888 sp->s_name[8] = hexdigits[pid & 0xf]; 2889 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 2890 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 2891 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 2892 2893 /* Try lookitups until we get one that isn't there */ 2894 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2895 curlwp, (struct nfsnode **)0) == 0) { 2896 sp->s_name[4]++; 2897 if (sp->s_name[4] > 'z') { 2898 error = EINVAL; 2899 goto bad; 2900 } 2901 } 2902 if (dolink) { 2903 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 2904 sp->s_cred, curlwp); 2905 /* 2906 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 2907 */ 2908 if (error == ENOTSUP) { 2909 error = nfs_renameit(dvp, cnp, sp); 2910 } 2911 } else { 2912 error = nfs_renameit(dvp, cnp, sp); 2913 } 2914 if (error) 2915 goto bad; 2916 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2917 curlwp, &np); 2918 np->n_sillyrename = sp; 2919 return (0); 2920 bad: 2921 vrele(sp->s_dvp); 2922 kauth_cred_free(sp->s_cred); 2923 kmem_free(sp, sizeof(*sp)); 2924 return (error); 2925 } 2926 2927 /* 2928 * Look up a file name and optionally either update the file handle or 2929 * allocate an nfsnode, depending on the value of npp. 2930 * npp == NULL --> just do the lookup 2931 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2932 * handled too 2933 * *npp != NULL --> update the file handle in the vnode 2934 */ 2935 int 2936 nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp) 2937 { 2938 u_int32_t *tl; 2939 char *cp; 2940 int32_t t1, t2; 2941 struct vnode *newvp = (struct vnode *)0; 2942 struct nfsnode *np, *dnp = VTONFS(dvp); 2943 char *bpos, *dpos, *cp2; 2944 int error = 0, ofhlen, fhlen; 2945 #ifndef NFS_V2_ONLY 2946 int attrflag; 2947 #endif 2948 struct mbuf *mreq, *mrep, *md, *mb; 2949 nfsfh_t *ofhp, *nfhp; 2950 const int v3 = NFS_ISV3(dvp); 2951 2952 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2953 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 2954 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2955 nfsm_fhtom(dnp, v3); 2956 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2957 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 2958 if (npp && !error) { 2959 nfsm_getfh(nfhp, fhlen, v3); 2960 if (*npp) { 2961 np = *npp; 2962 newvp = NFSTOV(np); 2963 ofhlen = np->n_fhsize; 2964 ofhp = kmem_alloc(ofhlen, KM_SLEEP); 2965 memcpy(ofhp, np->n_fhp, ofhlen); 2966 error = vcache_rekey_enter(newvp->v_mount, newvp, 2967 ofhp, ofhlen, nfhp, fhlen); 2968 if (error) { 2969 kmem_free(ofhp, ofhlen); 2970 m_freem(mrep); 2971 return error; 2972 } 2973 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2974 kmem_free(np->n_fhp, np->n_fhsize); 2975 np->n_fhp = &np->n_fh; 2976 } 2977 #if NFS_SMALLFH < NFSX_V3FHMAX 2978 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 2979 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 2980 #endif 2981 memcpy(np->n_fhp, nfhp, fhlen); 2982 np->n_fhsize = fhlen; 2983 vcache_rekey_exit(newvp->v_mount, newvp, 2984 ofhp, ofhlen, np->n_fhp, fhlen); 2985 kmem_free(ofhp, ofhlen); 2986 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2987 vref(dvp); 2988 newvp = dvp; 2989 np = dnp; 2990 } else { 2991 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2992 if (error) { 2993 m_freem(mrep); 2994 return (error); 2995 } 2996 newvp = NFSTOV(np); 2997 } 2998 #ifndef NFS_V2_ONLY 2999 if (v3) { 3000 nfsm_postop_attr(newvp, attrflag, 0); 3001 if (!attrflag && *npp == NULL) { 3002 m_freem(mrep); 3003 vput(newvp); 3004 return (ENOENT); 3005 } 3006 } else 3007 #endif 3008 nfsm_loadattr(newvp, (struct vattr *)0, 0); 3009 } 3010 nfsm_reqdone; 3011 if (npp && *npp == NULL) { 3012 if (error) { 3013 if (newvp) 3014 vput(newvp); 3015 } else 3016 *npp = np; 3017 } 3018 return (error); 3019 } 3020 3021 #ifndef NFS_V2_ONLY 3022 /* 3023 * Nfs Version 3 commit rpc 3024 */ 3025 int 3026 nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l) 3027 { 3028 char *cp; 3029 u_int32_t *tl; 3030 int32_t t1, t2; 3031 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3032 char *bpos, *dpos, *cp2; 3033 int error = 0, wccflag = NFSV3_WCCRATTR; 3034 struct mbuf *mreq, *mrep, *md, *mb; 3035 struct nfsnode *np; 3036 3037 KASSERT(NFS_ISV3(vp)); 3038 3039 #ifdef NFS_DEBUG_COMMIT 3040 printf("commit %lu - %lu\n", (unsigned long)offset, 3041 (unsigned long)(offset + cnt)); 3042 #endif 3043 3044 mutex_enter(&nmp->nm_lock); 3045 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 3046 mutex_exit(&nmp->nm_lock); 3047 return (0); 3048 } 3049 mutex_exit(&nmp->nm_lock); 3050 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3051 np = VTONFS(vp); 3052 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 3053 nfsm_fhtom(np, 1); 3054 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 3055 txdr_hyper(offset, tl); 3056 tl += 2; 3057 *tl = txdr_unsigned(cnt); 3058 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3059 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3060 if (!error) { 3061 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3062 mutex_enter(&nmp->nm_lock); 3063 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3064 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3065 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3066 error = NFSERR_STALEWRITEVERF; 3067 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3068 } 3069 mutex_exit(&nmp->nm_lock); 3070 } 3071 nfsm_reqdone; 3072 return (error); 3073 } 3074 #endif 3075 3076 /* 3077 * Kludge City.. 3078 * - make nfs_bmap() essentially a no-op that does no translation 3079 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3080 * (Maybe I could use the process's page mapping, but I was concerned that 3081 * Kernel Write might not be enabled and also figured copyout() would do 3082 * a lot more work than memcpy() and also it currently happens in the 3083 * context of the swapper process (2). 3084 */ 3085 int 3086 nfs_bmap(void *v) 3087 { 3088 struct vop_bmap_args /* { 3089 struct vnode *a_vp; 3090 daddr_t a_bn; 3091 struct vnode **a_vpp; 3092 daddr_t *a_bnp; 3093 int *a_runp; 3094 } */ *ap = v; 3095 struct vnode *vp = ap->a_vp; 3096 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3097 3098 if (ap->a_vpp != NULL) 3099 *ap->a_vpp = vp; 3100 if (ap->a_bnp != NULL) 3101 *ap->a_bnp = ap->a_bn << bshift; 3102 if (ap->a_runp != NULL) 3103 *ap->a_runp = 1024 * 1024; /* XXX */ 3104 return (0); 3105 } 3106 3107 /* 3108 * Strategy routine. 3109 * For async requests when nfsiod(s) are running, queue the request by 3110 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3111 * request. 3112 */ 3113 int 3114 nfs_strategy(void *v) 3115 { 3116 struct vop_strategy_args *ap = v; 3117 struct buf *bp = ap->a_bp; 3118 int error = 0; 3119 3120 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3121 panic("nfs physio/async"); 3122 3123 /* 3124 * If the op is asynchronous and an i/o daemon is waiting 3125 * queue the request, wake it up and wait for completion 3126 * otherwise just do it ourselves. 3127 */ 3128 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3129 error = nfs_doio(bp); 3130 return (error); 3131 } 3132 3133 /* 3134 * fsync vnode op. Just call nfs_flush() with commit == 1. 3135 */ 3136 /* ARGSUSED */ 3137 int 3138 nfs_fsync(void *v) 3139 { 3140 struct vop_fsync_args /* { 3141 struct vnodeop_desc *a_desc; 3142 struct vnode * a_vp; 3143 kauth_cred_t a_cred; 3144 int a_flags; 3145 off_t offlo; 3146 off_t offhi; 3147 struct lwp * a_l; 3148 } */ *ap = v; 3149 3150 struct vnode *vp = ap->a_vp; 3151 3152 if (vp->v_type != VREG) 3153 return 0; 3154 3155 return (nfs_flush(vp, ap->a_cred, 3156 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3157 } 3158 3159 /* 3160 * Flush all the data associated with a vnode. 3161 */ 3162 int 3163 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3164 int commit) 3165 { 3166 struct nfsnode *np = VTONFS(vp); 3167 int error; 3168 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3169 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3170 3171 rw_enter(vp->v_uobj.vmobjlock, RW_WRITER); 3172 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3173 if (np->n_flag & NWRITEERR) { 3174 error = np->n_error; 3175 np->n_flag &= ~NWRITEERR; 3176 } 3177 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3178 return (error); 3179 } 3180 3181 /* 3182 * Return POSIX pathconf information applicable to nfs. 3183 * 3184 * N.B. The NFS V2 protocol doesn't support this RPC. 3185 */ 3186 /* ARGSUSED */ 3187 int 3188 nfs_pathconf(void *v) 3189 { 3190 struct vop_pathconf_args /* { 3191 struct vnode *a_vp; 3192 int a_name; 3193 register_t *a_retval; 3194 } */ *ap = v; 3195 struct nfsv3_pathconf *pcp; 3196 struct vnode *vp = ap->a_vp; 3197 struct mbuf *mreq, *mrep, *md, *mb; 3198 int32_t t1, t2; 3199 u_int32_t *tl; 3200 char *bpos, *dpos, *cp, *cp2; 3201 int error = 0, attrflag; 3202 #ifndef NFS_V2_ONLY 3203 struct nfsmount *nmp; 3204 unsigned int l; 3205 u_int64_t maxsize; 3206 #endif 3207 const int v3 = NFS_ISV3(vp); 3208 struct nfsnode *np = VTONFS(vp); 3209 3210 switch (ap->a_name) { 3211 /* Names that can be resolved locally. */ 3212 case _PC_PIPE_BUF: 3213 *ap->a_retval = PIPE_BUF; 3214 break; 3215 case _PC_SYNC_IO: 3216 *ap->a_retval = 1; 3217 break; 3218 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3219 case _PC_LINK_MAX: 3220 case _PC_NAME_MAX: 3221 case _PC_CHOWN_RESTRICTED: 3222 case _PC_NO_TRUNC: 3223 if (!v3) { 3224 error = EINVAL; 3225 break; 3226 } 3227 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3228 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3229 nfsm_fhtom(np, 1); 3230 nfsm_request(np, NFSPROC_PATHCONF, 3231 curlwp, curlwp->l_cred); /* XXX */ 3232 nfsm_postop_attr(vp, attrflag, 0); 3233 if (!error) { 3234 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3235 NFSX_V3PATHCONF); 3236 switch (ap->a_name) { 3237 case _PC_LINK_MAX: 3238 *ap->a_retval = 3239 fxdr_unsigned(register_t, pcp->pc_linkmax); 3240 break; 3241 case _PC_NAME_MAX: 3242 *ap->a_retval = 3243 fxdr_unsigned(register_t, pcp->pc_namemax); 3244 break; 3245 case _PC_CHOWN_RESTRICTED: 3246 *ap->a_retval = 3247 (pcp->pc_chownrestricted == nfs_true); 3248 break; 3249 case _PC_NO_TRUNC: 3250 *ap->a_retval = 3251 (pcp->pc_notrunc == nfs_true); 3252 break; 3253 } 3254 } 3255 nfsm_reqdone; 3256 break; 3257 case _PC_FILESIZEBITS: 3258 #ifndef NFS_V2_ONLY 3259 if (v3) { 3260 nmp = VFSTONFS(vp->v_mount); 3261 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3262 if ((error = nfs_fsinfo(nmp, vp, 3263 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3264 break; 3265 for (l = 0, maxsize = nmp->nm_maxfilesize; 3266 (maxsize >> l) > 0; l++) 3267 ; 3268 *ap->a_retval = l + 1; 3269 } else 3270 #endif 3271 { 3272 *ap->a_retval = 32; /* NFS V2 limitation */ 3273 } 3274 break; 3275 default: 3276 error = genfs_pathconf(ap); 3277 break; 3278 } 3279 3280 return (error); 3281 } 3282 3283 /* 3284 * NFS advisory byte-level locks. 3285 */ 3286 int 3287 nfs_advlock(void *v) 3288 { 3289 struct vop_advlock_args /* { 3290 struct vnode *a_vp; 3291 void *a_id; 3292 int a_op; 3293 struct flock *a_fl; 3294 int a_flags; 3295 } */ *ap = v; 3296 struct nfsnode *np = VTONFS(ap->a_vp); 3297 3298 return lf_advlock(ap, &np->n_lockf, np->n_size); 3299 } 3300 3301 /* 3302 * Print out the contents of an nfsnode. 3303 */ 3304 int 3305 nfs_print(void *v) 3306 { 3307 struct vop_print_args /* { 3308 struct vnode *a_vp; 3309 } */ *ap = v; 3310 struct vnode *vp = ap->a_vp; 3311 struct nfsnode *np = VTONFS(vp); 3312 3313 printf("tag VT_NFS, fileid %lld fsid 0x%llx", 3314 (unsigned long long)np->n_vattr->va_fileid, 3315 (unsigned long long)np->n_vattr->va_fsid); 3316 if (vp->v_type == VFIFO) 3317 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 3318 printf("\n"); 3319 return (0); 3320 } 3321 3322 /* 3323 * nfs unlock wrapper. 3324 */ 3325 int 3326 nfs_unlock(void *v) 3327 { 3328 struct vop_unlock_args /* { 3329 struct vnode *a_vp; 3330 int a_flags; 3331 } */ *ap = v; 3332 struct vnode *vp = ap->a_vp; 3333 3334 /* 3335 * VOP_UNLOCK can be called by nfs_loadattrcache 3336 * with v_data == 0. 3337 */ 3338 if (VTONFS(vp)) { 3339 nfs_delayedtruncate(vp); 3340 } 3341 3342 return genfs_unlock(v); 3343 } 3344 3345 /* 3346 * nfs special file access vnode op. 3347 * Essentially just get vattr and then imitate iaccess() since the device is 3348 * local to the client. 3349 */ 3350 int 3351 nfsspec_access(void *v) 3352 { 3353 struct vop_access_args /* { 3354 struct vnode *a_vp; 3355 accmode_t a_accmode; 3356 kauth_cred_t a_cred; 3357 struct lwp *a_l; 3358 } */ *ap = v; 3359 struct vattr va; 3360 struct vnode *vp = ap->a_vp; 3361 int error; 3362 3363 error = VOP_GETATTR(vp, &va, ap->a_cred); 3364 if (error) 3365 return (error); 3366 3367 /* 3368 * Disallow write attempts on filesystems mounted read-only; 3369 * unless the file is a socket, fifo, or a block or character 3370 * device resident on the filesystem. 3371 */ 3372 if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3373 switch (vp->v_type) { 3374 case VREG: 3375 case VDIR: 3376 case VLNK: 3377 return (EROFS); 3378 default: 3379 break; 3380 } 3381 } 3382 3383 return kauth_authorize_vnode(ap->a_cred, KAUTH_ACCESS_ACTION( 3384 ap->a_accmode, va.va_type, va.va_mode), vp, NULL, genfs_can_access( 3385 vp, ap->a_cred, va.va_uid, va.va_gid, va.va_mode, NULL, 3386 ap->a_accmode)); 3387 } 3388 3389 /* 3390 * Read wrapper for special devices. 3391 */ 3392 int 3393 nfsspec_read(void *v) 3394 { 3395 struct vop_read_args /* { 3396 struct vnode *a_vp; 3397 struct uio *a_uio; 3398 int a_ioflag; 3399 kauth_cred_t a_cred; 3400 } */ *ap = v; 3401 struct nfsnode *np = VTONFS(ap->a_vp); 3402 3403 /* 3404 * Set access flag. 3405 */ 3406 np->n_flag |= NACC; 3407 getnanotime(&np->n_atim); 3408 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3409 } 3410 3411 /* 3412 * Write wrapper for special devices. 3413 */ 3414 int 3415 nfsspec_write(void *v) 3416 { 3417 struct vop_write_args /* { 3418 struct vnode *a_vp; 3419 struct uio *a_uio; 3420 int a_ioflag; 3421 kauth_cred_t a_cred; 3422 } */ *ap = v; 3423 struct nfsnode *np = VTONFS(ap->a_vp); 3424 3425 /* 3426 * Set update flag. 3427 */ 3428 np->n_flag |= NUPD; 3429 getnanotime(&np->n_mtim); 3430 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3431 } 3432 3433 /* 3434 * Close wrapper for special devices. 3435 * 3436 * Update the times on the nfsnode then do device close. 3437 */ 3438 int 3439 nfsspec_close(void *v) 3440 { 3441 struct vop_close_args /* { 3442 struct vnode *a_vp; 3443 int a_fflag; 3444 kauth_cred_t a_cred; 3445 struct lwp *a_l; 3446 } */ *ap = v; 3447 struct vnode *vp = ap->a_vp; 3448 struct nfsnode *np = VTONFS(vp); 3449 struct vattr vattr; 3450 3451 if (np->n_flag & (NACC | NUPD)) { 3452 np->n_flag |= NCHG; 3453 if (vrefcnt(vp) == 1 && 3454 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3455 vattr_null(&vattr); 3456 if (np->n_flag & NACC) 3457 vattr.va_atime = np->n_atim; 3458 if (np->n_flag & NUPD) 3459 vattr.va_mtime = np->n_mtim; 3460 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3461 } 3462 } 3463 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3464 } 3465 3466 /* 3467 * Read wrapper for fifos. 3468 */ 3469 int 3470 nfsfifo_read(void *v) 3471 { 3472 struct vop_read_args /* { 3473 struct vnode *a_vp; 3474 struct uio *a_uio; 3475 int a_ioflag; 3476 kauth_cred_t a_cred; 3477 } */ *ap = v; 3478 struct nfsnode *np = VTONFS(ap->a_vp); 3479 3480 /* 3481 * Set access flag. 3482 */ 3483 np->n_flag |= NACC; 3484 getnanotime(&np->n_atim); 3485 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3486 } 3487 3488 /* 3489 * Write wrapper for fifos. 3490 */ 3491 int 3492 nfsfifo_write(void *v) 3493 { 3494 struct vop_write_args /* { 3495 struct vnode *a_vp; 3496 struct uio *a_uio; 3497 int a_ioflag; 3498 kauth_cred_t a_cred; 3499 } */ *ap = v; 3500 struct nfsnode *np = VTONFS(ap->a_vp); 3501 3502 /* 3503 * Set update flag. 3504 */ 3505 np->n_flag |= NUPD; 3506 getnanotime(&np->n_mtim); 3507 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3508 } 3509 3510 /* 3511 * Close wrapper for fifos. 3512 * 3513 * Update the times on the nfsnode then do fifo close. 3514 */ 3515 int 3516 nfsfifo_close(void *v) 3517 { 3518 struct vop_close_args /* { 3519 struct vnode *a_vp; 3520 int a_fflag; 3521 kauth_cred_t a_cred; 3522 struct lwp *a_l; 3523 } */ *ap = v; 3524 struct vnode *vp = ap->a_vp; 3525 struct nfsnode *np = VTONFS(vp); 3526 struct vattr vattr; 3527 3528 if (np->n_flag & (NACC | NUPD)) { 3529 struct timespec ts; 3530 3531 getnanotime(&ts); 3532 if (np->n_flag & NACC) 3533 np->n_atim = ts; 3534 if (np->n_flag & NUPD) 3535 np->n_mtim = ts; 3536 np->n_flag |= NCHG; 3537 if (vrefcnt(vp) == 1 && 3538 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3539 vattr_null(&vattr); 3540 if (np->n_flag & NACC) 3541 vattr.va_atime = np->n_atim; 3542 if (np->n_flag & NUPD) 3543 vattr.va_mtime = np->n_mtim; 3544 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3545 } 3546 } 3547 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3548 } 3549