1 /* $NetBSD: nfs_vnops.c,v 1.310 2017/04/26 03:02:49 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 1.310 2017/04/26 03:02:49 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 #include <uvm/uvm_extern.h> 74 #include <uvm/uvm.h> 75 76 #include <miscfs/fifofs/fifo.h> 77 #include <miscfs/genfs/genfs.h> 78 #include <miscfs/genfs/genfs_node.h> 79 #include <miscfs/specfs/specdev.h> 80 81 #include <nfs/rpcv2.h> 82 #include <nfs/nfsproto.h> 83 #include <nfs/nfs.h> 84 #include <nfs/nfsnode.h> 85 #include <nfs/nfsmount.h> 86 #include <nfs/xdr_subs.h> 87 #include <nfs/nfsm_subs.h> 88 #include <nfs/nfs_var.h> 89 90 #include <net/if.h> 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 94 /* 95 * Global vfs data structures for nfs 96 */ 97 int (**nfsv2_vnodeop_p)(void *); 98 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 99 { &vop_default_desc, vn_default_error }, 100 { &vop_lookup_desc, nfs_lookup }, /* lookup */ 101 { &vop_create_desc, nfs_create }, /* create */ 102 { &vop_mknod_desc, nfs_mknod }, /* mknod */ 103 { &vop_open_desc, nfs_open }, /* open */ 104 { &vop_close_desc, nfs_close }, /* close */ 105 { &vop_access_desc, nfs_access }, /* access */ 106 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 107 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 108 { &vop_read_desc, nfs_read }, /* read */ 109 { &vop_write_desc, nfs_write }, /* write */ 110 { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ 111 { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ 112 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 113 { &vop_ioctl_desc, nfs_ioctl }, /* ioctl */ 114 { &vop_poll_desc, nfs_poll }, /* poll */ 115 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 116 { &vop_revoke_desc, nfs_revoke }, /* revoke */ 117 { &vop_mmap_desc, nfs_mmap }, /* mmap */ 118 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 119 { &vop_seek_desc, nfs_seek }, /* seek */ 120 { &vop_remove_desc, nfs_remove }, /* remove */ 121 { &vop_link_desc, nfs_link }, /* link */ 122 { &vop_rename_desc, nfs_rename }, /* rename */ 123 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 124 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 125 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 126 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 127 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 128 { &vop_abortop_desc, nfs_abortop }, /* abortop */ 129 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 130 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 131 { &vop_lock_desc, nfs_lock }, /* lock */ 132 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 133 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 134 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 135 { &vop_print_desc, nfs_print }, /* print */ 136 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 137 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 138 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 139 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 140 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 141 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 142 { NULL, NULL } 143 }; 144 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 145 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 146 147 /* 148 * Special device vnode ops 149 */ 150 int (**spec_nfsv2nodeop_p)(void *); 151 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 152 { &vop_default_desc, vn_default_error }, 153 { &vop_lookup_desc, spec_lookup }, /* lookup */ 154 { &vop_create_desc, spec_create }, /* create */ 155 { &vop_mknod_desc, spec_mknod }, /* mknod */ 156 { &vop_open_desc, spec_open }, /* open */ 157 { &vop_close_desc, nfsspec_close }, /* close */ 158 { &vop_access_desc, nfsspec_access }, /* access */ 159 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 160 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 161 { &vop_read_desc, nfsspec_read }, /* read */ 162 { &vop_write_desc, nfsspec_write }, /* write */ 163 { &vop_fallocate_desc, spec_fallocate }, /* fallocate */ 164 { &vop_fdiscard_desc, spec_fdiscard }, /* fdiscard */ 165 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 166 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 167 { &vop_poll_desc, spec_poll }, /* poll */ 168 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 169 { &vop_revoke_desc, spec_revoke }, /* revoke */ 170 { &vop_mmap_desc, spec_mmap }, /* mmap */ 171 { &vop_fsync_desc, spec_fsync }, /* fsync */ 172 { &vop_seek_desc, spec_seek }, /* seek */ 173 { &vop_remove_desc, spec_remove }, /* remove */ 174 { &vop_link_desc, spec_link }, /* link */ 175 { &vop_rename_desc, spec_rename }, /* rename */ 176 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 177 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 178 { &vop_symlink_desc, spec_symlink }, /* symlink */ 179 { &vop_readdir_desc, spec_readdir }, /* readdir */ 180 { &vop_readlink_desc, spec_readlink }, /* readlink */ 181 { &vop_abortop_desc, spec_abortop }, /* abortop */ 182 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 183 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 184 { &vop_lock_desc, nfs_lock }, /* lock */ 185 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 186 { &vop_bmap_desc, spec_bmap }, /* bmap */ 187 { &vop_strategy_desc, spec_strategy }, /* strategy */ 188 { &vop_print_desc, nfs_print }, /* print */ 189 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 190 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 191 { &vop_advlock_desc, spec_advlock }, /* advlock */ 192 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 193 { &vop_getpages_desc, spec_getpages }, /* getpages */ 194 { &vop_putpages_desc, spec_putpages }, /* putpages */ 195 { NULL, NULL } 196 }; 197 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 198 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 199 200 int (**fifo_nfsv2nodeop_p)(void *); 201 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 202 { &vop_default_desc, vn_default_error }, 203 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 204 { &vop_create_desc, vn_fifo_bypass }, /* create */ 205 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 206 { &vop_open_desc, vn_fifo_bypass }, /* open */ 207 { &vop_close_desc, nfsfifo_close }, /* close */ 208 { &vop_access_desc, nfsspec_access }, /* access */ 209 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 210 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 211 { &vop_read_desc, nfsfifo_read }, /* read */ 212 { &vop_write_desc, nfsfifo_write }, /* write */ 213 { &vop_fallocate_desc, vn_fifo_bypass }, /* fallocate */ 214 { &vop_fdiscard_desc, vn_fifo_bypass }, /* fdiscard */ 215 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 216 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 217 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 218 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 219 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 220 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 221 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 222 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 223 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 224 { &vop_link_desc, vn_fifo_bypass }, /* link */ 225 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 226 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 227 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 228 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 229 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 230 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 231 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 232 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 233 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 234 { &vop_lock_desc, nfs_lock }, /* lock */ 235 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 236 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 237 { &vop_strategy_desc, genfs_badop }, /* strategy */ 238 { &vop_print_desc, nfs_print }, /* print */ 239 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 240 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 241 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 242 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 243 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 244 { NULL, NULL } 245 }; 246 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 247 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 248 249 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 250 size_t, kauth_cred_t, struct lwp *); 251 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 252 253 /* 254 * Global variables 255 */ 256 extern u_int32_t nfs_true, nfs_false; 257 extern u_int32_t nfs_xdrneg1; 258 extern const nfstype nfsv3_type[9]; 259 260 int nfs_numasync = 0; 261 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 262 #define UIO_ADVANCE(uio, siz) \ 263 (void)((uio)->uio_resid -= (siz), \ 264 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 265 (uio)->uio_iov->iov_len -= (siz)) 266 267 static void nfs_cache_enter(struct vnode *, struct vnode *, 268 struct componentname *); 269 270 static void 271 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 272 struct componentname *cnp) 273 { 274 struct nfsnode *dnp = VTONFS(dvp); 275 276 if ((cnp->cn_flags & MAKEENTRY) == 0) { 277 return; 278 } 279 if (vp != NULL) { 280 struct nfsnode *np = VTONFS(vp); 281 282 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 283 } 284 285 if (!timespecisset(&dnp->n_nctime)) 286 dnp->n_nctime = dnp->n_vattr->va_mtime; 287 288 cache_enter(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, cnp->cn_flags); 289 } 290 291 /* 292 * nfs null call from vfs. 293 */ 294 int 295 nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l) 296 { 297 char *bpos, *dpos; 298 int error = 0; 299 struct mbuf *mreq, *mrep, *md, *mb __unused; 300 struct nfsnode *np = VTONFS(vp); 301 302 nfsm_reqhead(np, NFSPROC_NULL, 0); 303 nfsm_request(np, NFSPROC_NULL, l, cred); 304 nfsm_reqdone; 305 return (error); 306 } 307 308 /* 309 * nfs access vnode op. 310 * For nfs version 2, just return ok. File accesses may fail later. 311 * For nfs version 3, use the access rpc to check accessibility. If file modes 312 * are changed on the server, accesses might still fail later. 313 */ 314 int 315 nfs_access(void *v) 316 { 317 struct vop_access_args /* { 318 struct vnode *a_vp; 319 int a_mode; 320 kauth_cred_t a_cred; 321 } */ *ap = v; 322 struct vnode *vp = ap->a_vp; 323 #ifndef NFS_V2_ONLY 324 u_int32_t *tl; 325 char *cp; 326 int32_t t1, t2; 327 char *bpos, *dpos, *cp2; 328 int error = 0, attrflag; 329 struct mbuf *mreq, *mrep, *md, *mb; 330 u_int32_t mode, rmode; 331 const int v3 = NFS_ISV3(vp); 332 #endif 333 int cachevalid; 334 struct nfsnode *np = VTONFS(vp); 335 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 336 337 cachevalid = (np->n_accstamp != -1 && 338 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 339 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 340 341 /* 342 * Check access cache first. If this request has been made for this 343 * uid shortly before, use the cached result. 344 */ 345 if (cachevalid) { 346 if (!np->n_accerror) { 347 if ((np->n_accmode & ap->a_mode) == ap->a_mode) 348 return np->n_accerror; 349 } else if ((np->n_accmode & ap->a_mode) == np->n_accmode) 350 return np->n_accerror; 351 } 352 353 #ifndef NFS_V2_ONLY 354 /* 355 * For nfs v3, do an access rpc, otherwise you are stuck emulating 356 * ufs_access() locally using the vattr. This may not be correct, 357 * since the server may apply other access criteria such as 358 * client uid-->server uid mapping that we do not know about, but 359 * this is better than just returning anything that is lying about 360 * in the cache. 361 */ 362 if (v3) { 363 nfsstats.rpccnt[NFSPROC_ACCESS]++; 364 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 365 nfsm_fhtom(np, v3); 366 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 367 if (ap->a_mode & VREAD) 368 mode = NFSV3ACCESS_READ; 369 else 370 mode = 0; 371 if (vp->v_type != VDIR) { 372 if (ap->a_mode & VWRITE) 373 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 374 if (ap->a_mode & VEXEC) 375 mode |= NFSV3ACCESS_EXECUTE; 376 } else { 377 if (ap->a_mode & VWRITE) 378 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 379 NFSV3ACCESS_DELETE); 380 if (ap->a_mode & VEXEC) 381 mode |= NFSV3ACCESS_LOOKUP; 382 } 383 *tl = txdr_unsigned(mode); 384 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 385 nfsm_postop_attr(vp, attrflag, 0); 386 if (!error) { 387 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 388 rmode = fxdr_unsigned(u_int32_t, *tl); 389 /* 390 * The NFS V3 spec does not clarify whether or not 391 * the returned access bits can be a superset of 392 * the ones requested, so... 393 */ 394 if ((rmode & mode) != mode) 395 error = EACCES; 396 } 397 nfsm_reqdone; 398 } else 399 #endif 400 return (nfsspec_access(ap)); 401 #ifndef NFS_V2_ONLY 402 /* 403 * Disallow write attempts on filesystems mounted read-only; 404 * unless the file is a socket, fifo, or a block or character 405 * device resident on the filesystem. 406 */ 407 if (!error && (ap->a_mode & VWRITE) && 408 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 409 switch (vp->v_type) { 410 case VREG: 411 case VDIR: 412 case VLNK: 413 error = EROFS; 414 default: 415 break; 416 } 417 } 418 419 if (!error || error == EACCES) { 420 /* 421 * If we got the same result as for a previous, 422 * different request, OR it in. Don't update 423 * the timestamp in that case. 424 */ 425 if (cachevalid && np->n_accstamp != -1 && 426 error == np->n_accerror) { 427 if (!error) 428 np->n_accmode |= ap->a_mode; 429 else if ((np->n_accmode & ap->a_mode) == ap->a_mode) 430 np->n_accmode = ap->a_mode; 431 } else { 432 np->n_accstamp = time_uptime; 433 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 434 np->n_accmode = ap->a_mode; 435 np->n_accerror = error; 436 } 437 } 438 439 return (error); 440 #endif 441 } 442 443 /* 444 * nfs open vnode op 445 * Check to see if the type is ok 446 * and that deletion is not in progress. 447 * For paged in text files, you will need to flush the page cache 448 * if consistency is lost. 449 */ 450 /* ARGSUSED */ 451 int 452 nfs_open(void *v) 453 { 454 struct vop_open_args /* { 455 struct vnode *a_vp; 456 int a_mode; 457 kauth_cred_t a_cred; 458 } */ *ap = v; 459 struct vnode *vp = ap->a_vp; 460 struct nfsnode *np = VTONFS(vp); 461 int error; 462 463 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 464 return (EACCES); 465 } 466 467 if (ap->a_mode & FREAD) { 468 if (np->n_rcred != NULL) 469 kauth_cred_free(np->n_rcred); 470 np->n_rcred = ap->a_cred; 471 kauth_cred_hold(np->n_rcred); 472 } 473 if (ap->a_mode & FWRITE) { 474 if (np->n_wcred != NULL) 475 kauth_cred_free(np->n_wcred); 476 np->n_wcred = ap->a_cred; 477 kauth_cred_hold(np->n_wcred); 478 } 479 480 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 481 if (error) 482 return error; 483 484 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 485 486 return (0); 487 } 488 489 /* 490 * nfs close vnode op 491 * What an NFS client should do upon close after writing is a debatable issue. 492 * Most NFS clients push delayed writes to the server upon close, basically for 493 * two reasons: 494 * 1 - So that any write errors may be reported back to the client process 495 * doing the close system call. By far the two most likely errors are 496 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 497 * 2 - To put a worst case upper bound on cache inconsistency between 498 * multiple clients for the file. 499 * There is also a consistency problem for Version 2 of the protocol w.r.t. 500 * not being able to tell if other clients are writing a file concurrently, 501 * since there is no way of knowing if the changed modify time in the reply 502 * is only due to the write for this client. 503 * (NFS Version 3 provides weak cache consistency data in the reply that 504 * should be sufficient to detect and handle this case.) 505 * 506 * The current code does the following: 507 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 508 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 509 * or commit them (this satisfies 1 and 2 except for the 510 * case where the server crashes after this close but 511 * before the commit RPC, which is felt to be "good 512 * enough". Changing the last argument to nfs_flush() to 513 * a 1 would force a commit operation, if it is felt a 514 * commit is necessary now. 515 */ 516 /* ARGSUSED */ 517 int 518 nfs_close(void *v) 519 { 520 struct vop_close_args /* { 521 struct vnodeop_desc *a_desc; 522 struct vnode *a_vp; 523 int a_fflag; 524 kauth_cred_t a_cred; 525 } */ *ap = v; 526 struct vnode *vp = ap->a_vp; 527 struct nfsnode *np = VTONFS(vp); 528 int error = 0; 529 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 530 531 if (vp->v_type == VREG) { 532 if (np->n_flag & NMODIFIED) { 533 #ifndef NFS_V2_ONLY 534 if (NFS_ISV3(vp)) { 535 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 536 np->n_flag &= ~NMODIFIED; 537 } else 538 #endif 539 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 540 NFS_INVALIDATE_ATTRCACHE(np); 541 } 542 if (np->n_flag & NWRITEERR) { 543 np->n_flag &= ~NWRITEERR; 544 error = np->n_error; 545 } 546 } 547 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 548 return (error); 549 } 550 551 /* 552 * nfs getattr call from vfs. 553 */ 554 int 555 nfs_getattr(void *v) 556 { 557 struct vop_getattr_args /* { 558 struct vnode *a_vp; 559 struct vattr *a_vap; 560 kauth_cred_t a_cred; 561 } */ *ap = v; 562 struct vnode *vp = ap->a_vp; 563 struct nfsnode *np = VTONFS(vp); 564 char *cp; 565 u_int32_t *tl; 566 int32_t t1, t2; 567 char *bpos, *dpos; 568 int error = 0; 569 struct mbuf *mreq, *mrep, *md, *mb; 570 const int v3 = NFS_ISV3(vp); 571 572 /* 573 * Update local times for special files. 574 */ 575 if (np->n_flag & (NACC | NUPD)) 576 np->n_flag |= NCHG; 577 578 /* 579 * if we have delayed truncation, do it now. 580 */ 581 nfs_delayedtruncate(vp); 582 583 /* 584 * First look in the cache. 585 */ 586 if (nfs_getattrcache(vp, ap->a_vap) == 0) 587 return (0); 588 nfsstats.rpccnt[NFSPROC_GETATTR]++; 589 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 590 nfsm_fhtom(np, v3); 591 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 592 if (!error) { 593 nfsm_loadattr(vp, ap->a_vap, 0); 594 if (vp->v_type == VDIR && 595 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 596 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 597 } 598 nfsm_reqdone; 599 return (error); 600 } 601 602 /* 603 * nfs setattr call. 604 */ 605 int 606 nfs_setattr(void *v) 607 { 608 struct vop_setattr_args /* { 609 struct vnodeop_desc *a_desc; 610 struct vnode *a_vp; 611 struct vattr *a_vap; 612 kauth_cred_t a_cred; 613 } */ *ap = v; 614 struct vnode *vp = ap->a_vp; 615 struct nfsnode *np = VTONFS(vp); 616 struct vattr *vap = ap->a_vap; 617 int error = 0; 618 u_quad_t tsize = 0; 619 620 /* 621 * Setting of flags is not supported. 622 */ 623 if (vap->va_flags != VNOVAL) 624 return (EOPNOTSUPP); 625 626 /* 627 * Disallow write attempts if the filesystem is mounted read-only. 628 */ 629 if ((vap->va_uid != (uid_t)VNOVAL || 630 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 631 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 632 (vp->v_mount->mnt_flag & MNT_RDONLY)) 633 return (EROFS); 634 if (vap->va_size != VNOVAL) { 635 if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { 636 return EFBIG; 637 } 638 switch (vp->v_type) { 639 case VDIR: 640 return (EISDIR); 641 case VCHR: 642 case VBLK: 643 case VSOCK: 644 case VFIFO: 645 if (vap->va_mtime.tv_sec == VNOVAL && 646 vap->va_atime.tv_sec == VNOVAL && 647 vap->va_mode == (mode_t)VNOVAL && 648 vap->va_uid == (uid_t)VNOVAL && 649 vap->va_gid == (gid_t)VNOVAL) 650 return (0); 651 vap->va_size = VNOVAL; 652 break; 653 default: 654 /* 655 * Disallow write attempts if the filesystem is 656 * mounted read-only. 657 */ 658 if (vp->v_mount->mnt_flag & MNT_RDONLY) 659 return (EROFS); 660 genfs_node_wrlock(vp); 661 uvm_vnp_setsize(vp, vap->va_size); 662 tsize = np->n_size; 663 np->n_size = vap->va_size; 664 if (vap->va_size == 0) 665 error = nfs_vinvalbuf(vp, 0, 666 ap->a_cred, curlwp, 1); 667 else 668 error = nfs_vinvalbuf(vp, V_SAVE, 669 ap->a_cred, curlwp, 1); 670 if (error) { 671 uvm_vnp_setsize(vp, tsize); 672 genfs_node_unlock(vp); 673 return (error); 674 } 675 np->n_vattr->va_size = vap->va_size; 676 } 677 } else { 678 /* 679 * flush files before setattr because a later write of 680 * cached data might change timestamps or reset sugid bits 681 */ 682 if ((vap->va_mtime.tv_sec != VNOVAL || 683 vap->va_atime.tv_sec != VNOVAL || 684 vap->va_mode != VNOVAL) && 685 vp->v_type == VREG && 686 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 687 curlwp, 1)) == EINTR) 688 return (error); 689 } 690 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 691 if (vap->va_size != VNOVAL) { 692 if (error) { 693 np->n_size = np->n_vattr->va_size = tsize; 694 uvm_vnp_setsize(vp, np->n_size); 695 } 696 genfs_node_unlock(vp); 697 } 698 VN_KNOTE(vp, NOTE_ATTRIB); 699 return (error); 700 } 701 702 /* 703 * Do an nfs setattr rpc. 704 */ 705 int 706 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, struct lwp *l) 707 { 708 struct nfsv2_sattr *sp; 709 char *cp; 710 int32_t t1, t2; 711 char *bpos, *dpos; 712 u_int32_t *tl; 713 int error = 0; 714 struct mbuf *mreq, *mrep, *md, *mb; 715 const int v3 = NFS_ISV3(vp); 716 struct nfsnode *np = VTONFS(vp); 717 #ifndef NFS_V2_ONLY 718 int wccflag = NFSV3_WCCRATTR; 719 char *cp2; 720 #endif 721 722 nfsstats.rpccnt[NFSPROC_SETATTR]++; 723 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 724 nfsm_fhtom(np, v3); 725 #ifndef NFS_V2_ONLY 726 if (v3) { 727 nfsm_v3attrbuild(vap, true); 728 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 729 *tl = nfs_false; 730 } else { 731 #endif 732 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 733 if (vap->va_mode == (mode_t)VNOVAL) 734 sp->sa_mode = nfs_xdrneg1; 735 else 736 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 737 if (vap->va_uid == (uid_t)VNOVAL) 738 sp->sa_uid = nfs_xdrneg1; 739 else 740 sp->sa_uid = txdr_unsigned(vap->va_uid); 741 if (vap->va_gid == (gid_t)VNOVAL) 742 sp->sa_gid = nfs_xdrneg1; 743 else 744 sp->sa_gid = txdr_unsigned(vap->va_gid); 745 sp->sa_size = txdr_unsigned(vap->va_size); 746 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 747 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 748 #ifndef NFS_V2_ONLY 749 } 750 #endif 751 nfsm_request(np, NFSPROC_SETATTR, l, cred); 752 #ifndef NFS_V2_ONLY 753 if (v3) { 754 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 755 } else 756 #endif 757 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 758 nfsm_reqdone; 759 return (error); 760 } 761 762 /* 763 * nfs lookup call, one step at a time... 764 * First look in cache 765 * If not found, do the rpc. 766 */ 767 int 768 nfs_lookup(void *v) 769 { 770 struct vop_lookup_v2_args /* { 771 struct vnodeop_desc *a_desc; 772 struct vnode *a_dvp; 773 struct vnode **a_vpp; 774 struct componentname *a_cnp; 775 } */ *ap = v; 776 struct componentname *cnp = ap->a_cnp; 777 struct vnode *dvp = ap->a_dvp; 778 struct vnode **vpp = ap->a_vpp; 779 int flags; 780 struct vnode *newvp; 781 u_int32_t *tl; 782 char *cp; 783 int32_t t1, t2; 784 char *bpos, *dpos, *cp2; 785 struct mbuf *mreq, *mrep, *md, *mb; 786 long len; 787 nfsfh_t *fhp; 788 struct nfsnode *np; 789 int cachefound; 790 int error = 0, attrflag, fhsize; 791 const int v3 = NFS_ISV3(dvp); 792 793 flags = cnp->cn_flags; 794 795 *vpp = NULLVP; 796 newvp = NULLVP; 797 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 798 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 799 return (EROFS); 800 if (dvp->v_type != VDIR) 801 return (ENOTDIR); 802 803 /* 804 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 805 */ 806 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 807 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 808 if (error) 809 return error; 810 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 811 return EISDIR; 812 vref(dvp); 813 *vpp = dvp; 814 return 0; 815 } 816 817 np = VTONFS(dvp); 818 819 /* 820 * Before performing an RPC, check the name cache to see if 821 * the directory/name pair we are looking for is known already. 822 * If the directory/name pair is found in the name cache, 823 * we have to ensure the directory has not changed from 824 * the time the cache entry has been created. If it has, 825 * the cache entry has to be ignored. 826 */ 827 cachefound = cache_lookup_raw(dvp, cnp->cn_nameptr, cnp->cn_namelen, 828 cnp->cn_flags, NULL, vpp); 829 KASSERT(dvp != *vpp); 830 KASSERT((cnp->cn_flags & ISWHITEOUT) == 0); 831 if (cachefound) { 832 struct vattr vattr; 833 834 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 835 if (error != 0) { 836 if (*vpp != NULLVP) 837 vrele(*vpp); 838 *vpp = NULLVP; 839 return error; 840 } 841 842 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 843 || timespeccmp(&vattr.va_mtime, 844 &VTONFS(dvp)->n_nctime, !=)) { 845 if (*vpp != NULLVP) { 846 vrele(*vpp); 847 *vpp = NULLVP; 848 } 849 cache_purge1(dvp, NULL, 0, PURGE_CHILDREN); 850 timespecclear(&np->n_nctime); 851 goto dorpc; 852 } 853 854 if (*vpp == NULLVP) { 855 /* namecache gave us a negative result */ 856 error = ENOENT; 857 goto noentry; 858 } 859 860 /* 861 * investigate the vnode returned by cache_lookup_raw. 862 * if it isn't appropriate, do an rpc. 863 */ 864 newvp = *vpp; 865 if ((flags & ISDOTDOT) != 0) { 866 VOP_UNLOCK(dvp); 867 } 868 error = vn_lock(newvp, LK_SHARED); 869 if ((flags & ISDOTDOT) != 0) { 870 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 871 } 872 if (error != 0) { 873 /* newvp has been reclaimed. */ 874 vrele(newvp); 875 *vpp = NULLVP; 876 goto dorpc; 877 } 878 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 879 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 880 nfsstats.lookupcache_hits++; 881 KASSERT(newvp->v_type != VNON); 882 VOP_UNLOCK(newvp); 883 return (0); 884 } 885 cache_purge1(newvp, NULL, 0, PURGE_PARENTS); 886 vput(newvp); 887 *vpp = NULLVP; 888 } 889 dorpc: 890 #if 0 891 /* 892 * because nfsv3 has the same CREATE semantics as ours, 893 * we don't have to perform LOOKUPs beforehand. 894 * 895 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 896 * XXX although we have no way to know if O_EXCL is requested or not. 897 */ 898 899 if (v3 && cnp->cn_nameiop == CREATE && 900 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 901 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 902 return (EJUSTRETURN); 903 } 904 #endif /* 0 */ 905 906 error = 0; 907 newvp = NULLVP; 908 nfsstats.lookupcache_misses++; 909 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 910 len = cnp->cn_namelen; 911 nfsm_reqhead(np, NFSPROC_LOOKUP, 912 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 913 nfsm_fhtom(np, v3); 914 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 915 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 916 if (error) { 917 nfsm_postop_attr(dvp, attrflag, 0); 918 m_freem(mrep); 919 goto nfsmout; 920 } 921 nfsm_getfh(fhp, fhsize, v3); 922 923 /* 924 * Handle RENAME case... 925 */ 926 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 927 if (NFS_CMPFH(np, fhp, fhsize)) { 928 m_freem(mrep); 929 return (EISDIR); 930 } 931 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 932 if (error) { 933 m_freem(mrep); 934 return error; 935 } 936 newvp = NFSTOV(np); 937 #ifndef NFS_V2_ONLY 938 if (v3) { 939 nfsm_postop_attr(newvp, attrflag, 0); 940 nfsm_postop_attr(dvp, attrflag, 0); 941 } else 942 #endif 943 nfsm_loadattr(newvp, (struct vattr *)0, 0); 944 *vpp = newvp; 945 m_freem(mrep); 946 goto validate; 947 } 948 949 /* 950 * The postop attr handling is duplicated for each if case, 951 * because it should be done while dvp is locked (unlocking 952 * dvp is different for each case). 953 */ 954 955 if (NFS_CMPFH(np, fhp, fhsize)) { 956 /* 957 * As we handle "." lookup locally, this is 958 * a broken server. 959 */ 960 m_freem(mrep); 961 return EBADRPC; 962 } else if (flags & ISDOTDOT) { 963 /* 964 * ".." lookup 965 */ 966 VOP_UNLOCK(dvp); 967 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 968 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 969 if (error) { 970 m_freem(mrep); 971 return error; 972 } 973 newvp = NFSTOV(np); 974 975 #ifndef NFS_V2_ONLY 976 if (v3) { 977 nfsm_postop_attr(newvp, attrflag, 0); 978 nfsm_postop_attr(dvp, attrflag, 0); 979 } else 980 #endif 981 nfsm_loadattr(newvp, (struct vattr *)0, 0); 982 } else { 983 /* 984 * Other lookups. 985 */ 986 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 987 if (error) { 988 m_freem(mrep); 989 return error; 990 } 991 newvp = NFSTOV(np); 992 #ifndef NFS_V2_ONLY 993 if (v3) { 994 nfsm_postop_attr(newvp, attrflag, 0); 995 nfsm_postop_attr(dvp, attrflag, 0); 996 } else 997 #endif 998 nfsm_loadattr(newvp, (struct vattr *)0, 0); 999 } 1000 if (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) { 1001 nfs_cache_enter(dvp, newvp, cnp); 1002 } 1003 *vpp = newvp; 1004 nfsm_reqdone; 1005 if (error) { 1006 /* 1007 * We get here only because of errors returned by 1008 * the RPC. Otherwise we'll have returned above 1009 * (the nfsm_* macros will jump to nfsm_reqdone 1010 * on error). 1011 */ 1012 if (error == ENOENT && cnp->cn_nameiop != CREATE) { 1013 nfs_cache_enter(dvp, NULL, cnp); 1014 } 1015 if (newvp != NULLVP) { 1016 if (newvp == dvp) { 1017 vrele(newvp); 1018 } else { 1019 vput(newvp); 1020 } 1021 } 1022 noentry: 1023 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1024 (flags & ISLASTCN) && error == ENOENT) { 1025 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 1026 error = EROFS; 1027 } else { 1028 error = EJUSTRETURN; 1029 } 1030 } 1031 *vpp = NULL; 1032 return error; 1033 } 1034 1035 validate: 1036 /* 1037 * make sure we have valid type and size. 1038 */ 1039 1040 newvp = *vpp; 1041 if (newvp->v_type == VNON) { 1042 struct vattr vattr; /* dummy */ 1043 1044 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1045 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1046 if (error) { 1047 vput(newvp); 1048 *vpp = NULL; 1049 } 1050 } 1051 if (error) 1052 return error; 1053 if (newvp != dvp) 1054 VOP_UNLOCK(newvp); 1055 return 0; 1056 } 1057 1058 /* 1059 * nfs read call. 1060 * Just call nfs_bioread() to do the work. 1061 */ 1062 int 1063 nfs_read(void *v) 1064 { 1065 struct vop_read_args /* { 1066 struct vnode *a_vp; 1067 struct uio *a_uio; 1068 int a_ioflag; 1069 kauth_cred_t a_cred; 1070 } */ *ap = v; 1071 struct vnode *vp = ap->a_vp; 1072 1073 if (vp->v_type != VREG) 1074 return EISDIR; 1075 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1076 } 1077 1078 /* 1079 * nfs readlink call 1080 */ 1081 int 1082 nfs_readlink(void *v) 1083 { 1084 struct vop_readlink_args /* { 1085 struct vnode *a_vp; 1086 struct uio *a_uio; 1087 kauth_cred_t a_cred; 1088 } */ *ap = v; 1089 struct vnode *vp = ap->a_vp; 1090 struct nfsnode *np = VTONFS(vp); 1091 1092 if (vp->v_type != VLNK) 1093 return (EPERM); 1094 1095 if (np->n_rcred != NULL) { 1096 kauth_cred_free(np->n_rcred); 1097 } 1098 np->n_rcred = ap->a_cred; 1099 kauth_cred_hold(np->n_rcred); 1100 1101 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1102 } 1103 1104 /* 1105 * Do a readlink rpc. 1106 * Called by nfs_doio() from below the buffer cache. 1107 */ 1108 int 1109 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 1110 { 1111 u_int32_t *tl; 1112 char *cp; 1113 int32_t t1, t2; 1114 char *bpos, *dpos, *cp2; 1115 int error = 0; 1116 uint32_t len; 1117 struct mbuf *mreq, *mrep, *md, *mb; 1118 const int v3 = NFS_ISV3(vp); 1119 struct nfsnode *np = VTONFS(vp); 1120 #ifndef NFS_V2_ONLY 1121 int attrflag; 1122 #endif 1123 1124 nfsstats.rpccnt[NFSPROC_READLINK]++; 1125 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1126 nfsm_fhtom(np, v3); 1127 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1128 #ifndef NFS_V2_ONLY 1129 if (v3) 1130 nfsm_postop_attr(vp, attrflag, 0); 1131 #endif 1132 if (!error) { 1133 #ifndef NFS_V2_ONLY 1134 if (v3) { 1135 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1136 len = fxdr_unsigned(uint32_t, *tl); 1137 if (len > NFS_MAXPATHLEN) { 1138 /* 1139 * this pathname is too long for us. 1140 */ 1141 m_freem(mrep); 1142 /* Solaris returns EINVAL. should we follow? */ 1143 error = ENAMETOOLONG; 1144 goto nfsmout; 1145 } 1146 } else 1147 #endif 1148 { 1149 nfsm_strsiz(len, NFS_MAXPATHLEN); 1150 } 1151 nfsm_mtouio(uiop, len); 1152 } 1153 nfsm_reqdone; 1154 return (error); 1155 } 1156 1157 /* 1158 * nfs read rpc call 1159 * Ditto above 1160 */ 1161 int 1162 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1163 { 1164 u_int32_t *tl; 1165 char *cp; 1166 int32_t t1, t2; 1167 char *bpos, *dpos, *cp2; 1168 struct mbuf *mreq, *mrep, *md, *mb; 1169 struct nfsmount *nmp; 1170 int error = 0, len, retlen, tsiz, eof __unused, byte_count; 1171 const int v3 = NFS_ISV3(vp); 1172 struct nfsnode *np = VTONFS(vp); 1173 #ifndef NFS_V2_ONLY 1174 int attrflag; 1175 #endif 1176 1177 #ifndef nolint 1178 eof = 0; 1179 #endif 1180 nmp = VFSTONFS(vp->v_mount); 1181 tsiz = uiop->uio_resid; 1182 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1183 return (EFBIG); 1184 iostat_busy(nmp->nm_stats); 1185 byte_count = 0; /* count bytes actually transferred */ 1186 while (tsiz > 0) { 1187 nfsstats.rpccnt[NFSPROC_READ]++; 1188 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1189 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1190 nfsm_fhtom(np, v3); 1191 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1192 #ifndef NFS_V2_ONLY 1193 if (v3) { 1194 txdr_hyper(uiop->uio_offset, tl); 1195 *(tl + 2) = txdr_unsigned(len); 1196 } else 1197 #endif 1198 { 1199 *tl++ = txdr_unsigned(uiop->uio_offset); 1200 *tl++ = txdr_unsigned(len); 1201 *tl = 0; 1202 } 1203 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1204 #ifndef NFS_V2_ONLY 1205 if (v3) { 1206 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1207 if (error) { 1208 m_freem(mrep); 1209 goto nfsmout; 1210 } 1211 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1212 eof = fxdr_unsigned(int, *(tl + 1)); 1213 } else 1214 #endif 1215 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1216 nfsm_strsiz(retlen, nmp->nm_rsize); 1217 nfsm_mtouio(uiop, retlen); 1218 m_freem(mrep); 1219 tsiz -= retlen; 1220 byte_count += retlen; 1221 #ifndef NFS_V2_ONLY 1222 if (v3) { 1223 if (eof || retlen == 0) 1224 tsiz = 0; 1225 } else 1226 #endif 1227 if (retlen < len) 1228 tsiz = 0; 1229 } 1230 nfsmout: 1231 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1232 return (error); 1233 } 1234 1235 struct nfs_writerpc_context { 1236 kmutex_t nwc_lock; 1237 kcondvar_t nwc_cv; 1238 int nwc_mbufcount; 1239 }; 1240 1241 /* 1242 * free mbuf used to refer protected pages while write rpc call. 1243 * called at splvm. 1244 */ 1245 static void 1246 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1247 { 1248 struct nfs_writerpc_context *ctx = arg; 1249 1250 KASSERT(m != NULL); 1251 KASSERT(ctx != NULL); 1252 pool_cache_put(mb_cache, m); 1253 mutex_enter(&ctx->nwc_lock); 1254 if (--ctx->nwc_mbufcount == 0) { 1255 cv_signal(&ctx->nwc_cv); 1256 } 1257 mutex_exit(&ctx->nwc_lock); 1258 } 1259 1260 /* 1261 * nfs write call 1262 */ 1263 int 1264 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp) 1265 { 1266 u_int32_t *tl; 1267 char *cp; 1268 int32_t t1, t2; 1269 char *bpos, *dpos; 1270 struct mbuf *mreq, *mrep, *md, *mb; 1271 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1272 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1273 const int v3 = NFS_ISV3(vp); 1274 int committed = NFSV3WRITE_FILESYNC; 1275 struct nfsnode *np = VTONFS(vp); 1276 struct nfs_writerpc_context ctx; 1277 int byte_count; 1278 size_t origresid; 1279 #ifndef NFS_V2_ONLY 1280 char *cp2; 1281 int rlen, commit; 1282 #endif 1283 1284 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1285 panic("writerpc readonly vp %p", vp); 1286 } 1287 1288 #ifdef DIAGNOSTIC 1289 if (uiop->uio_iovcnt != 1) 1290 panic("nfs: writerpc iovcnt > 1"); 1291 #endif 1292 tsiz = uiop->uio_resid; 1293 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1294 return EFBIG; 1295 1296 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1297 cv_init(&ctx.nwc_cv, "nfsmblk"); 1298 ctx.nwc_mbufcount = 1; 1299 1300 retry: 1301 origresid = uiop->uio_resid; 1302 KASSERT(origresid == uiop->uio_iov->iov_len); 1303 iostat_busy(nmp->nm_stats); 1304 byte_count = 0; /* count of bytes actually written */ 1305 while (tsiz > 0) { 1306 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1307 size_t backup; 1308 bool stalewriteverf = false; 1309 1310 nfsstats.rpccnt[NFSPROC_WRITE]++; 1311 len = min(tsiz, nmp->nm_wsize); 1312 datalen = pageprotected ? 0 : nfsm_rndup(len); 1313 nfsm_reqhead(np, NFSPROC_WRITE, 1314 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1315 nfsm_fhtom(np, v3); 1316 #ifndef NFS_V2_ONLY 1317 if (v3) { 1318 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1319 txdr_hyper(uiop->uio_offset, tl); 1320 tl += 2; 1321 *tl++ = txdr_unsigned(len); 1322 *tl++ = txdr_unsigned(*iomode); 1323 *tl = txdr_unsigned(len); 1324 } else 1325 #endif 1326 { 1327 u_int32_t x; 1328 1329 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1330 /* Set both "begin" and "current" to non-garbage. */ 1331 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1332 *tl++ = x; /* "begin offset" */ 1333 *tl++ = x; /* "current offset" */ 1334 x = txdr_unsigned(len); 1335 *tl++ = x; /* total to this offset */ 1336 *tl = x; /* size of this write */ 1337 1338 } 1339 if (pageprotected) { 1340 /* 1341 * since we know pages can't be modified during i/o, 1342 * no need to copy them for us. 1343 */ 1344 struct mbuf *m; 1345 struct iovec *iovp = uiop->uio_iov; 1346 1347 m = m_get(M_WAIT, MT_DATA); 1348 MCLAIM(m, &nfs_mowner); 1349 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1350 nfs_writerpc_extfree, &ctx); 1351 m->m_flags |= M_EXT_ROMAP; 1352 m->m_len = len; 1353 mb->m_next = m; 1354 /* 1355 * no need to maintain mb and bpos here 1356 * because no one care them later. 1357 */ 1358 #if 0 1359 mb = m; 1360 bpos = mtod(void *, mb) + mb->m_len; 1361 #endif 1362 UIO_ADVANCE(uiop, len); 1363 uiop->uio_offset += len; 1364 mutex_enter(&ctx.nwc_lock); 1365 ctx.nwc_mbufcount++; 1366 mutex_exit(&ctx.nwc_lock); 1367 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1368 } else { 1369 nfsm_uiotom(uiop, len); 1370 } 1371 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1372 #ifndef NFS_V2_ONLY 1373 if (v3) { 1374 wccflag = NFSV3_WCCCHK; 1375 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1376 if (!error) { 1377 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1378 + NFSX_V3WRITEVERF); 1379 rlen = fxdr_unsigned(int, *tl++); 1380 if (rlen == 0) { 1381 error = NFSERR_IO; 1382 m_freem(mrep); 1383 break; 1384 } else if (rlen < len) { 1385 backup = len - rlen; 1386 UIO_ADVANCE(uiop, -backup); 1387 uiop->uio_offset -= backup; 1388 len = rlen; 1389 } 1390 commit = fxdr_unsigned(int, *tl++); 1391 1392 /* 1393 * Return the lowest committment level 1394 * obtained by any of the RPCs. 1395 */ 1396 if (committed == NFSV3WRITE_FILESYNC) 1397 committed = commit; 1398 else if (committed == NFSV3WRITE_DATASYNC && 1399 commit == NFSV3WRITE_UNSTABLE) 1400 committed = commit; 1401 mutex_enter(&nmp->nm_lock); 1402 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1403 memcpy(nmp->nm_writeverf, tl, 1404 NFSX_V3WRITEVERF); 1405 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1406 } else if ((nmp->nm_iflag & 1407 NFSMNT_STALEWRITEVERF) || 1408 memcmp(tl, nmp->nm_writeverf, 1409 NFSX_V3WRITEVERF)) { 1410 memcpy(nmp->nm_writeverf, tl, 1411 NFSX_V3WRITEVERF); 1412 /* 1413 * note NFSMNT_STALEWRITEVERF 1414 * if we're the first thread to 1415 * notice it. 1416 */ 1417 if ((nmp->nm_iflag & 1418 NFSMNT_STALEWRITEVERF) == 0) { 1419 stalewriteverf = true; 1420 nmp->nm_iflag |= 1421 NFSMNT_STALEWRITEVERF; 1422 } 1423 } 1424 mutex_exit(&nmp->nm_lock); 1425 } 1426 } else 1427 #endif 1428 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1429 if (wccflag) 1430 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1431 m_freem(mrep); 1432 if (error) 1433 break; 1434 tsiz -= len; 1435 byte_count += len; 1436 if (stalewriteverf) { 1437 *stalewriteverfp = true; 1438 stalewriteverf = false; 1439 if (committed == NFSV3WRITE_UNSTABLE && 1440 len != origresid) { 1441 /* 1442 * if our write requests weren't atomic but 1443 * unstable, datas in previous iterations 1444 * might have already been lost now. 1445 * then, we should resend them to nfsd. 1446 */ 1447 backup = origresid - tsiz; 1448 UIO_ADVANCE(uiop, -backup); 1449 uiop->uio_offset -= backup; 1450 tsiz = origresid; 1451 goto retry; 1452 } 1453 } 1454 } 1455 nfsmout: 1456 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1457 if (pageprotected) { 1458 /* 1459 * wait until mbufs go away. 1460 * retransmitted mbufs can survive longer than rpc requests 1461 * themselves. 1462 */ 1463 mutex_enter(&ctx.nwc_lock); 1464 ctx.nwc_mbufcount--; 1465 while (ctx.nwc_mbufcount > 0) { 1466 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1467 } 1468 mutex_exit(&ctx.nwc_lock); 1469 } 1470 mutex_destroy(&ctx.nwc_lock); 1471 cv_destroy(&ctx.nwc_cv); 1472 *iomode = committed; 1473 if (error) 1474 uiop->uio_resid = tsiz; 1475 return (error); 1476 } 1477 1478 /* 1479 * nfs mknod rpc 1480 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1481 * mode set to specify the file type and the size field for rdev. 1482 */ 1483 int 1484 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) 1485 { 1486 struct nfsv2_sattr *sp; 1487 u_int32_t *tl; 1488 char *cp; 1489 int32_t t1, t2; 1490 struct vnode *newvp = (struct vnode *)0; 1491 struct nfsnode *dnp, *np; 1492 char *cp2; 1493 char *bpos, *dpos; 1494 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1495 struct mbuf *mreq, *mrep, *md, *mb; 1496 u_int32_t rdev; 1497 const int v3 = NFS_ISV3(dvp); 1498 1499 if (vap->va_type == VCHR || vap->va_type == VBLK) 1500 rdev = txdr_unsigned(vap->va_rdev); 1501 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1502 rdev = nfs_xdrneg1; 1503 else { 1504 VOP_ABORTOP(dvp, cnp); 1505 return (EOPNOTSUPP); 1506 } 1507 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1508 dnp = VTONFS(dvp); 1509 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1510 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1511 nfsm_fhtom(dnp, v3); 1512 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1513 #ifndef NFS_V2_ONLY 1514 if (v3) { 1515 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1516 *tl++ = vtonfsv3_type(vap->va_type); 1517 nfsm_v3attrbuild(vap, false); 1518 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1519 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1520 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1521 *tl = txdr_unsigned(minor(vap->va_rdev)); 1522 } 1523 } else 1524 #endif 1525 { 1526 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1527 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1528 sp->sa_uid = nfs_xdrneg1; 1529 sp->sa_gid = nfs_xdrneg1; 1530 sp->sa_size = rdev; 1531 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1532 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1533 } 1534 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1535 if (!error) { 1536 nfsm_mtofh(dvp, newvp, v3, gotvp); 1537 if (!gotvp) { 1538 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1539 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1540 if (!error) 1541 newvp = NFSTOV(np); 1542 } 1543 } 1544 #ifndef NFS_V2_ONLY 1545 if (v3) 1546 nfsm_wcc_data(dvp, wccflag, 0, !error); 1547 #endif 1548 nfsm_reqdone; 1549 if (error) { 1550 if (newvp) 1551 vput(newvp); 1552 } else { 1553 nfs_cache_enter(dvp, newvp, cnp); 1554 *vpp = newvp; 1555 VOP_UNLOCK(newvp); 1556 } 1557 VTONFS(dvp)->n_flag |= NMODIFIED; 1558 if (!wccflag) 1559 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1560 return (error); 1561 } 1562 1563 /* 1564 * nfs mknod vop 1565 * just call nfs_mknodrpc() to do the work. 1566 */ 1567 /* ARGSUSED */ 1568 int 1569 nfs_mknod(void *v) 1570 { 1571 struct vop_mknod_v3_args /* { 1572 struct vnode *a_dvp; 1573 struct vnode **a_vpp; 1574 struct componentname *a_cnp; 1575 struct vattr *a_vap; 1576 } */ *ap = v; 1577 struct vnode *dvp = ap->a_dvp; 1578 struct componentname *cnp = ap->a_cnp; 1579 int error; 1580 1581 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap); 1582 VN_KNOTE(dvp, NOTE_WRITE); 1583 if (error == 0 || error == EEXIST) 1584 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1585 return (error); 1586 } 1587 1588 /* 1589 * nfs file create call 1590 */ 1591 int 1592 nfs_create(void *v) 1593 { 1594 struct vop_create_v3_args /* { 1595 struct vnode *a_dvp; 1596 struct vnode **a_vpp; 1597 struct componentname *a_cnp; 1598 struct vattr *a_vap; 1599 } */ *ap = v; 1600 struct vnode *dvp = ap->a_dvp; 1601 struct vattr *vap = ap->a_vap; 1602 struct componentname *cnp = ap->a_cnp; 1603 struct nfsv2_sattr *sp; 1604 u_int32_t *tl; 1605 char *cp; 1606 int32_t t1, t2; 1607 struct nfsnode *dnp, *np = (struct nfsnode *)0; 1608 struct vnode *newvp = (struct vnode *)0; 1609 char *bpos, *dpos, *cp2; 1610 int error, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1611 struct mbuf *mreq, *mrep, *md, *mb; 1612 const int v3 = NFS_ISV3(dvp); 1613 u_int32_t excl_mode = NFSV3CREATE_UNCHECKED; 1614 1615 /* 1616 * Oops, not for me.. 1617 */ 1618 if (vap->va_type == VSOCK) 1619 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1620 1621 KASSERT(vap->va_type == VREG); 1622 1623 #ifdef VA_EXCLUSIVE 1624 if (vap->va_vaflags & VA_EXCLUSIVE) { 1625 excl_mode = NFSV3CREATE_EXCLUSIVE; 1626 } 1627 #endif 1628 again: 1629 error = 0; 1630 nfsstats.rpccnt[NFSPROC_CREATE]++; 1631 dnp = VTONFS(dvp); 1632 nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1633 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1634 nfsm_fhtom(dnp, v3); 1635 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1636 #ifndef NFS_V2_ONLY 1637 if (v3) { 1638 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1639 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1640 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1641 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1642 *tl++ = cprng_fast32(); 1643 *tl = cprng_fast32(); 1644 } else { 1645 *tl = txdr_unsigned(excl_mode); 1646 nfsm_v3attrbuild(vap, false); 1647 } 1648 } else 1649 #endif 1650 { 1651 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1652 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1653 sp->sa_uid = nfs_xdrneg1; 1654 sp->sa_gid = nfs_xdrneg1; 1655 sp->sa_size = 0; 1656 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1657 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1658 } 1659 nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred); 1660 if (!error) { 1661 nfsm_mtofh(dvp, newvp, v3, gotvp); 1662 if (!gotvp) { 1663 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1664 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1665 if (!error) 1666 newvp = NFSTOV(np); 1667 } 1668 } 1669 #ifndef NFS_V2_ONLY 1670 if (v3) 1671 nfsm_wcc_data(dvp, wccflag, 0, !error); 1672 #endif 1673 nfsm_reqdone; 1674 if (error) { 1675 /* 1676 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 1677 */ 1678 if (v3 && error == ENOTSUP) { 1679 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1680 excl_mode = NFSV3CREATE_GUARDED; 1681 goto again; 1682 } else if (excl_mode == NFSV3CREATE_GUARDED) { 1683 excl_mode = NFSV3CREATE_UNCHECKED; 1684 goto again; 1685 } 1686 } 1687 } else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) { 1688 struct timespec ts; 1689 1690 getnanotime(&ts); 1691 1692 /* 1693 * make sure that we'll update timestamps as 1694 * most server implementations use them to store 1695 * the create verifier. 1696 * 1697 * XXX it's better to use TOSERVER always. 1698 */ 1699 1700 if (vap->va_atime.tv_sec == VNOVAL) 1701 vap->va_atime = ts; 1702 if (vap->va_mtime.tv_sec == VNOVAL) 1703 vap->va_mtime = ts; 1704 1705 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp); 1706 } 1707 if (error == 0) { 1708 if (cnp->cn_flags & MAKEENTRY) 1709 nfs_cache_enter(dvp, newvp, cnp); 1710 else 1711 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1712 *ap->a_vpp = newvp; 1713 VOP_UNLOCK(newvp); 1714 } else { 1715 if (newvp) 1716 vput(newvp); 1717 if (error == EEXIST) 1718 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 1719 } 1720 VTONFS(dvp)->n_flag |= NMODIFIED; 1721 if (!wccflag) 1722 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1723 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1724 return (error); 1725 } 1726 1727 /* 1728 * nfs file remove call 1729 * To try and make nfs semantics closer to ufs semantics, a file that has 1730 * other processes using the vnode is renamed instead of removed and then 1731 * removed later on the last close. 1732 * - If v_usecount > 1 1733 * If a rename is not already in the works 1734 * call nfs_sillyrename() to set it up 1735 * else 1736 * do the remove rpc 1737 */ 1738 int 1739 nfs_remove(void *v) 1740 { 1741 struct vop_remove_v2_args /* { 1742 struct vnodeop_desc *a_desc; 1743 struct vnode * a_dvp; 1744 struct vnode * a_vp; 1745 struct componentname * a_cnp; 1746 } */ *ap = v; 1747 struct vnode *vp = ap->a_vp; 1748 struct vnode *dvp = ap->a_dvp; 1749 struct componentname *cnp = ap->a_cnp; 1750 struct nfsnode *np = VTONFS(vp); 1751 int error = 0; 1752 struct vattr vattr; 1753 1754 #ifndef DIAGNOSTIC 1755 if (vp->v_usecount < 1) 1756 panic("nfs_remove: bad v_usecount"); 1757 #endif 1758 if (vp->v_type == VDIR) 1759 error = EPERM; 1760 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1761 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1762 vattr.va_nlink > 1)) { 1763 /* 1764 * Purge the name cache so that the chance of a lookup for 1765 * the name succeeding while the remove is in progress is 1766 * minimized. Without node locking it can still happen, such 1767 * that an I/O op returns ESTALE, but since you get this if 1768 * another host removes the file.. 1769 */ 1770 cache_purge(vp); 1771 /* 1772 * throw away biocache buffers, mainly to avoid 1773 * unnecessary delayed writes later. 1774 */ 1775 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1776 /* Do the rpc */ 1777 if (error != EINTR) 1778 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1779 cnp->cn_namelen, cnp->cn_cred, curlwp); 1780 } else if (!np->n_sillyrename) 1781 error = nfs_sillyrename(dvp, vp, cnp, false); 1782 if (!error && nfs_getattrcache(vp, &vattr) == 0 && 1783 vattr.va_nlink == 1) { 1784 np->n_flag |= NREMOVED; 1785 } 1786 NFS_INVALIDATE_ATTRCACHE(np); 1787 VN_KNOTE(vp, NOTE_DELETE); 1788 VN_KNOTE(dvp, NOTE_WRITE); 1789 if (dvp == vp) 1790 vrele(vp); 1791 else 1792 vput(vp); 1793 return (error); 1794 } 1795 1796 /* 1797 * nfs file remove rpc called from nfs_inactive 1798 */ 1799 int 1800 nfs_removeit(struct sillyrename *sp) 1801 { 1802 1803 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1804 (struct lwp *)0)); 1805 } 1806 1807 /* 1808 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1809 */ 1810 int 1811 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l) 1812 { 1813 u_int32_t *tl; 1814 char *cp; 1815 #ifndef NFS_V2_ONLY 1816 int32_t t1; 1817 char *cp2; 1818 #endif 1819 int32_t t2; 1820 char *bpos, *dpos; 1821 int error = 0, wccflag = NFSV3_WCCRATTR; 1822 struct mbuf *mreq, *mrep, *md, *mb; 1823 const int v3 = NFS_ISV3(dvp); 1824 int rexmit = 0; 1825 struct nfsnode *dnp = VTONFS(dvp); 1826 1827 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1828 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1829 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1830 nfsm_fhtom(dnp, v3); 1831 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1832 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1833 #ifndef NFS_V2_ONLY 1834 if (v3) 1835 nfsm_wcc_data(dvp, wccflag, 0, !error); 1836 #endif 1837 nfsm_reqdone; 1838 VTONFS(dvp)->n_flag |= NMODIFIED; 1839 if (!wccflag) 1840 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1841 /* 1842 * Kludge City: If the first reply to the remove rpc is lost.. 1843 * the reply to the retransmitted request will be ENOENT 1844 * since the file was in fact removed 1845 * Therefore, we cheat and return success. 1846 */ 1847 if (rexmit && error == ENOENT) 1848 error = 0; 1849 return (error); 1850 } 1851 1852 /* 1853 * nfs file rename call 1854 */ 1855 int 1856 nfs_rename(void *v) 1857 { 1858 struct vop_rename_args /* { 1859 struct vnode *a_fdvp; 1860 struct vnode *a_fvp; 1861 struct componentname *a_fcnp; 1862 struct vnode *a_tdvp; 1863 struct vnode *a_tvp; 1864 struct componentname *a_tcnp; 1865 } */ *ap = v; 1866 struct vnode *fvp = ap->a_fvp; 1867 struct vnode *tvp = ap->a_tvp; 1868 struct vnode *fdvp = ap->a_fdvp; 1869 struct vnode *tdvp = ap->a_tdvp; 1870 struct componentname *tcnp = ap->a_tcnp; 1871 struct componentname *fcnp = ap->a_fcnp; 1872 int error; 1873 1874 /* Check for cross-device rename */ 1875 if ((fvp->v_mount != tdvp->v_mount) || 1876 (tvp && (fvp->v_mount != tvp->v_mount))) { 1877 error = EXDEV; 1878 goto out; 1879 } 1880 1881 /* 1882 * If the tvp exists and is in use, sillyrename it before doing the 1883 * rename of the new file over it. 1884 * 1885 * Have sillyrename use link instead of rename if possible, 1886 * so that we don't lose the file if the rename fails, and so 1887 * that there's no window when the "to" file doesn't exist. 1888 */ 1889 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1890 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1891 VN_KNOTE(tvp, NOTE_DELETE); 1892 vput(tvp); 1893 tvp = NULL; 1894 } 1895 1896 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1897 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1898 curlwp); 1899 1900 VN_KNOTE(fdvp, NOTE_WRITE); 1901 VN_KNOTE(tdvp, NOTE_WRITE); 1902 if (error == 0 || error == EEXIST) { 1903 if (fvp->v_type == VDIR) 1904 cache_purge(fvp); 1905 else 1906 cache_purge1(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1907 0); 1908 if (tvp != NULL && tvp->v_type == VDIR) 1909 cache_purge(tvp); 1910 else 1911 cache_purge1(tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, 1912 0); 1913 } 1914 out: 1915 if (tdvp == tvp) 1916 vrele(tdvp); 1917 else 1918 vput(tdvp); 1919 if (tvp) 1920 vput(tvp); 1921 vrele(fdvp); 1922 vrele(fvp); 1923 return (error); 1924 } 1925 1926 /* 1927 * nfs file rename rpc called from nfs_remove() above 1928 */ 1929 int 1930 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp) 1931 { 1932 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1933 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 1934 } 1935 1936 /* 1937 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1938 */ 1939 int 1940 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) 1941 { 1942 u_int32_t *tl; 1943 char *cp; 1944 #ifndef NFS_V2_ONLY 1945 int32_t t1; 1946 char *cp2; 1947 #endif 1948 int32_t t2; 1949 char *bpos, *dpos; 1950 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1951 struct mbuf *mreq, *mrep, *md, *mb; 1952 const int v3 = NFS_ISV3(fdvp); 1953 int rexmit = 0; 1954 struct nfsnode *fdnp = VTONFS(fdvp); 1955 1956 nfsstats.rpccnt[NFSPROC_RENAME]++; 1957 nfsm_reqhead(fdnp, NFSPROC_RENAME, 1958 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1959 nfsm_rndup(tnamelen)); 1960 nfsm_fhtom(fdnp, v3); 1961 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1962 nfsm_fhtom(VTONFS(tdvp), v3); 1963 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1964 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 1965 #ifndef NFS_V2_ONLY 1966 if (v3) { 1967 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 1968 nfsm_wcc_data(tdvp, twccflag, 0, !error); 1969 } 1970 #endif 1971 nfsm_reqdone; 1972 VTONFS(fdvp)->n_flag |= NMODIFIED; 1973 VTONFS(tdvp)->n_flag |= NMODIFIED; 1974 if (!fwccflag) 1975 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 1976 if (!twccflag) 1977 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 1978 /* 1979 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1980 */ 1981 if (rexmit && error == ENOENT) 1982 error = 0; 1983 return (error); 1984 } 1985 1986 /* 1987 * NFS link RPC, called from nfs_link. 1988 * Assumes dvp and vp locked, and leaves them that way. 1989 */ 1990 1991 static int 1992 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 1993 size_t namelen, kauth_cred_t cred, struct lwp *l) 1994 { 1995 u_int32_t *tl; 1996 char *cp; 1997 #ifndef NFS_V2_ONLY 1998 int32_t t1; 1999 char *cp2; 2000 #endif 2001 int32_t t2; 2002 char *bpos, *dpos; 2003 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2004 struct mbuf *mreq, *mrep, *md, *mb; 2005 const int v3 = NFS_ISV3(dvp); 2006 int rexmit = 0; 2007 struct nfsnode *np = VTONFS(vp); 2008 2009 nfsstats.rpccnt[NFSPROC_LINK]++; 2010 nfsm_reqhead(np, NFSPROC_LINK, 2011 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 2012 nfsm_fhtom(np, v3); 2013 nfsm_fhtom(VTONFS(dvp), v3); 2014 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 2015 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 2016 #ifndef NFS_V2_ONLY 2017 if (v3) { 2018 nfsm_postop_attr(vp, attrflag, 0); 2019 nfsm_wcc_data(dvp, wccflag, 0, !error); 2020 } 2021 #endif 2022 nfsm_reqdone; 2023 2024 VTONFS(dvp)->n_flag |= NMODIFIED; 2025 if (!attrflag) 2026 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 2027 if (!wccflag) 2028 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2029 2030 /* 2031 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2032 */ 2033 if (rexmit && error == EEXIST) 2034 error = 0; 2035 2036 return error; 2037 } 2038 2039 /* 2040 * nfs hard link create call 2041 */ 2042 int 2043 nfs_link(void *v) 2044 { 2045 struct vop_link_v2_args /* { 2046 struct vnode *a_dvp; 2047 struct vnode *a_vp; 2048 struct componentname *a_cnp; 2049 } */ *ap = v; 2050 struct vnode *vp = ap->a_vp; 2051 struct vnode *dvp = ap->a_dvp; 2052 struct componentname *cnp = ap->a_cnp; 2053 int error = 0; 2054 2055 error = vn_lock(vp, LK_EXCLUSIVE); 2056 if (error != 0) { 2057 VOP_ABORTOP(dvp, cnp); 2058 return error; 2059 } 2060 2061 /* 2062 * Push all writes to the server, so that the attribute cache 2063 * doesn't get "out of sync" with the server. 2064 * XXX There should be a better way! 2065 */ 2066 VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0); 2067 2068 error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2069 cnp->cn_cred, curlwp); 2070 2071 if (error == 0) { 2072 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2073 } 2074 VOP_UNLOCK(vp); 2075 VN_KNOTE(vp, NOTE_LINK); 2076 VN_KNOTE(dvp, NOTE_WRITE); 2077 return (error); 2078 } 2079 2080 /* 2081 * nfs symbolic link create call 2082 */ 2083 int 2084 nfs_symlink(void *v) 2085 { 2086 struct vop_symlink_v3_args /* { 2087 struct vnode *a_dvp; 2088 struct vnode **a_vpp; 2089 struct componentname *a_cnp; 2090 struct vattr *a_vap; 2091 char *a_target; 2092 } */ *ap = v; 2093 struct vnode *dvp = ap->a_dvp; 2094 struct vattr *vap = ap->a_vap; 2095 struct componentname *cnp = ap->a_cnp; 2096 struct nfsv2_sattr *sp; 2097 u_int32_t *tl; 2098 char *cp; 2099 int32_t t1, t2; 2100 char *bpos, *dpos, *cp2; 2101 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2102 struct mbuf *mreq, *mrep, *md, *mb; 2103 struct vnode *newvp = (struct vnode *)0; 2104 const int v3 = NFS_ISV3(dvp); 2105 int rexmit = 0; 2106 struct nfsnode *dnp = VTONFS(dvp); 2107 2108 *ap->a_vpp = NULL; 2109 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2110 slen = strlen(ap->a_target); 2111 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2112 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2113 nfsm_fhtom(dnp, v3); 2114 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2115 #ifndef NFS_V2_ONlY 2116 if (v3) 2117 nfsm_v3attrbuild(vap, false); 2118 #endif 2119 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2120 #ifndef NFS_V2_ONlY 2121 if (!v3) { 2122 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2123 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2124 sp->sa_uid = nfs_xdrneg1; 2125 sp->sa_gid = nfs_xdrneg1; 2126 sp->sa_size = nfs_xdrneg1; 2127 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2128 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2129 } 2130 #endif 2131 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2132 &rexmit); 2133 #ifndef NFS_V2_ONlY 2134 if (v3) { 2135 if (!error) 2136 nfsm_mtofh(dvp, newvp, v3, gotvp); 2137 nfsm_wcc_data(dvp, wccflag, 0, !error); 2138 } 2139 #endif 2140 nfsm_reqdone; 2141 /* 2142 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2143 */ 2144 if (rexmit && error == EEXIST) 2145 error = 0; 2146 if (error == 0 || error == EEXIST) 2147 cache_purge1(dvp, cnp->cn_nameptr, cnp->cn_namelen, 0); 2148 if (error == 0 && newvp == NULL) { 2149 struct nfsnode *np = NULL; 2150 2151 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2152 cnp->cn_cred, curlwp, &np); 2153 if (error == 0) 2154 newvp = NFSTOV(np); 2155 } 2156 if (error) { 2157 if (newvp != NULL) 2158 vput(newvp); 2159 } else { 2160 *ap->a_vpp = newvp; 2161 VOP_UNLOCK(newvp); 2162 } 2163 VTONFS(dvp)->n_flag |= NMODIFIED; 2164 if (!wccflag) 2165 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2166 VN_KNOTE(dvp, NOTE_WRITE); 2167 return (error); 2168 } 2169 2170 /* 2171 * nfs make dir call 2172 */ 2173 int 2174 nfs_mkdir(void *v) 2175 { 2176 struct vop_mkdir_v3_args /* { 2177 struct vnode *a_dvp; 2178 struct vnode **a_vpp; 2179 struct componentname *a_cnp; 2180 struct vattr *a_vap; 2181 } */ *ap = v; 2182 struct vnode *dvp = ap->a_dvp; 2183 struct vattr *vap = ap->a_vap; 2184 struct componentname *cnp = ap->a_cnp; 2185 struct nfsv2_sattr *sp; 2186 u_int32_t *tl; 2187 char *cp; 2188 int32_t t1, t2; 2189 int len; 2190 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2191 struct vnode *newvp = (struct vnode *)0; 2192 char *bpos, *dpos, *cp2; 2193 int error = 0, wccflag = NFSV3_WCCRATTR; 2194 int gotvp = 0; 2195 int rexmit = 0; 2196 struct mbuf *mreq, *mrep, *md, *mb; 2197 const int v3 = NFS_ISV3(dvp); 2198 2199 len = cnp->cn_namelen; 2200 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2201 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2202 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2203 nfsm_fhtom(dnp, v3); 2204 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2205 #ifndef NFS_V2_ONLY 2206 if (v3) { 2207 nfsm_v3attrbuild(vap, false); 2208 } else 2209 #endif 2210 { 2211 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2212 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2213 sp->sa_uid = nfs_xdrneg1; 2214 sp->sa_gid = nfs_xdrneg1; 2215 sp->sa_size = nfs_xdrneg1; 2216 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2217 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2218 } 2219 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2220 if (!error) 2221 nfsm_mtofh(dvp, newvp, v3, gotvp); 2222 if (v3) 2223 nfsm_wcc_data(dvp, wccflag, 0, !error); 2224 nfsm_reqdone; 2225 VTONFS(dvp)->n_flag |= NMODIFIED; 2226 if (!wccflag) 2227 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2228 /* 2229 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2230 * if we can succeed in looking up the directory. 2231 */ 2232 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2233 if (newvp) { 2234 vput(newvp); 2235 newvp = (struct vnode *)0; 2236 } 2237 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2238 curlwp, &np); 2239 if (!error) { 2240 newvp = NFSTOV(np); 2241 if (newvp->v_type != VDIR || newvp == dvp) 2242 error = EEXIST; 2243 } 2244 } 2245 if (error) { 2246 if (newvp) { 2247 if (dvp != newvp) 2248 vput(newvp); 2249 else 2250 vrele(newvp); 2251 } 2252 } else { 2253 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2254 nfs_cache_enter(dvp, newvp, cnp); 2255 *ap->a_vpp = newvp; 2256 VOP_UNLOCK(newvp); 2257 } 2258 return (error); 2259 } 2260 2261 /* 2262 * nfs remove directory call 2263 */ 2264 int 2265 nfs_rmdir(void *v) 2266 { 2267 struct vop_rmdir_v2_args /* { 2268 struct vnode *a_dvp; 2269 struct vnode *a_vp; 2270 struct componentname *a_cnp; 2271 } */ *ap = v; 2272 struct vnode *vp = ap->a_vp; 2273 struct vnode *dvp = ap->a_dvp; 2274 struct componentname *cnp = ap->a_cnp; 2275 u_int32_t *tl; 2276 char *cp; 2277 #ifndef NFS_V2_ONLY 2278 int32_t t1; 2279 char *cp2; 2280 #endif 2281 int32_t t2; 2282 char *bpos, *dpos; 2283 int error = 0, wccflag = NFSV3_WCCRATTR; 2284 int rexmit = 0; 2285 struct mbuf *mreq, *mrep, *md, *mb; 2286 const int v3 = NFS_ISV3(dvp); 2287 struct nfsnode *dnp; 2288 2289 if (dvp == vp) { 2290 vrele(vp); 2291 return (EINVAL); 2292 } 2293 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2294 dnp = VTONFS(dvp); 2295 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2296 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2297 nfsm_fhtom(dnp, v3); 2298 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2299 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2300 #ifndef NFS_V2_ONLY 2301 if (v3) 2302 nfsm_wcc_data(dvp, wccflag, 0, !error); 2303 #endif 2304 nfsm_reqdone; 2305 VTONFS(dvp)->n_flag |= NMODIFIED; 2306 if (!wccflag) 2307 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2308 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2309 VN_KNOTE(vp, NOTE_DELETE); 2310 cache_purge(vp); 2311 vput(vp); 2312 /* 2313 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2314 */ 2315 if (rexmit && error == ENOENT) 2316 error = 0; 2317 return (error); 2318 } 2319 2320 /* 2321 * nfs readdir call 2322 */ 2323 int 2324 nfs_readdir(void *v) 2325 { 2326 struct vop_readdir_args /* { 2327 struct vnode *a_vp; 2328 struct uio *a_uio; 2329 kauth_cred_t a_cred; 2330 int *a_eofflag; 2331 off_t **a_cookies; 2332 int *a_ncookies; 2333 } */ *ap = v; 2334 struct vnode *vp = ap->a_vp; 2335 struct uio *uio = ap->a_uio; 2336 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2337 char *base = uio->uio_iov->iov_base; 2338 int tresid, error; 2339 size_t count, lost; 2340 struct dirent *dp; 2341 off_t *cookies = NULL; 2342 int ncookies = 0, nc; 2343 2344 if (vp->v_type != VDIR) 2345 return (EPERM); 2346 2347 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2348 count = uio->uio_resid - lost; 2349 if (count <= 0) 2350 return (EINVAL); 2351 2352 /* 2353 * Call nfs_bioread() to do the real work. 2354 */ 2355 tresid = uio->uio_resid = count; 2356 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2357 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2358 2359 if (!error && ap->a_cookies) { 2360 ncookies = count / 16; 2361 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2362 *ap->a_cookies = cookies; 2363 } 2364 2365 if (!error && uio->uio_resid == tresid) { 2366 uio->uio_resid += lost; 2367 nfsstats.direofcache_misses++; 2368 if (ap->a_cookies) 2369 *ap->a_ncookies = 0; 2370 *ap->a_eofflag = 1; 2371 return (0); 2372 } 2373 2374 if (!error && ap->a_cookies) { 2375 /* 2376 * Only the NFS server and emulations use cookies, and they 2377 * load the directory block into system space, so we can 2378 * just look at it directly. 2379 */ 2380 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2381 uio->uio_iovcnt != 1) 2382 panic("nfs_readdir: lost in space"); 2383 for (nc = 0; ncookies-- && 2384 base < (char *)uio->uio_iov->iov_base; nc++){ 2385 dp = (struct dirent *) base; 2386 if (dp->d_reclen == 0) 2387 break; 2388 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2389 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2390 else 2391 *(cookies++) = NFS_GETCOOKIE(dp); 2392 base += dp->d_reclen; 2393 } 2394 uio->uio_resid += 2395 ((char *)uio->uio_iov->iov_base - base); 2396 uio->uio_iov->iov_len += 2397 ((char *)uio->uio_iov->iov_base - base); 2398 uio->uio_iov->iov_base = base; 2399 *ap->a_ncookies = nc; 2400 } 2401 2402 uio->uio_resid += lost; 2403 *ap->a_eofflag = 0; 2404 return (error); 2405 } 2406 2407 /* 2408 * Readdir rpc call. 2409 * Called from below the buffer cache by nfs_doio(). 2410 */ 2411 int 2412 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2413 { 2414 int len, left; 2415 struct dirent *dp = NULL; 2416 u_int32_t *tl; 2417 char *cp; 2418 int32_t t1, t2; 2419 char *bpos, *dpos, *cp2; 2420 struct mbuf *mreq, *mrep, *md, *mb; 2421 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2422 struct nfsnode *dnp = VTONFS(vp); 2423 u_quad_t fileno; 2424 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2425 #ifndef NFS_V2_ONLY 2426 int attrflag; 2427 #endif 2428 int nrpcs = 0, reclen; 2429 const int v3 = NFS_ISV3(vp); 2430 2431 #ifdef DIAGNOSTIC 2432 /* 2433 * Should be called from buffer cache, so only amount of 2434 * NFS_DIRBLKSIZ will be requested. 2435 */ 2436 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2437 panic("nfs readdirrpc bad uio"); 2438 #endif 2439 2440 /* 2441 * Loop around doing readdir rpc's of size nm_readdirsize 2442 * truncated to a multiple of NFS_DIRFRAGSIZ. 2443 * The stopping criteria is EOF or buffer full. 2444 */ 2445 while (more_dirs && bigenough) { 2446 /* 2447 * Heuristic: don't bother to do another RPC to further 2448 * fill up this block if there is not much room left. (< 50% 2449 * of the readdir RPC size). This wastes some buffer space 2450 * but can save up to 50% in RPC calls. 2451 */ 2452 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2453 bigenough = 0; 2454 break; 2455 } 2456 nfsstats.rpccnt[NFSPROC_READDIR]++; 2457 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2458 NFSX_READDIR(v3)); 2459 nfsm_fhtom(dnp, v3); 2460 #ifndef NFS_V2_ONLY 2461 if (v3) { 2462 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2463 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2464 txdr_swapcookie3(uiop->uio_offset, tl); 2465 } else { 2466 txdr_cookie3(uiop->uio_offset, tl); 2467 } 2468 tl += 2; 2469 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2470 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2471 } else 2472 #endif 2473 { 2474 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2475 *tl++ = txdr_unsigned(uiop->uio_offset); 2476 } 2477 *tl = txdr_unsigned(nmp->nm_readdirsize); 2478 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2479 nrpcs++; 2480 #ifndef NFS_V2_ONLY 2481 if (v3) { 2482 nfsm_postop_attr(vp, attrflag, 0); 2483 if (!error) { 2484 nfsm_dissect(tl, u_int32_t *, 2485 2 * NFSX_UNSIGNED); 2486 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2487 dnp->n_cookieverf.nfsuquad[1] = *tl; 2488 } else { 2489 m_freem(mrep); 2490 goto nfsmout; 2491 } 2492 } 2493 #endif 2494 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2495 more_dirs = fxdr_unsigned(int, *tl); 2496 2497 /* loop thru the dir entries, doctoring them to 4bsd form */ 2498 while (more_dirs && bigenough) { 2499 #ifndef NFS_V2_ONLY 2500 if (v3) { 2501 nfsm_dissect(tl, u_int32_t *, 2502 3 * NFSX_UNSIGNED); 2503 fileno = fxdr_hyper(tl); 2504 len = fxdr_unsigned(int, *(tl + 2)); 2505 } else 2506 #endif 2507 { 2508 nfsm_dissect(tl, u_int32_t *, 2509 2 * NFSX_UNSIGNED); 2510 fileno = fxdr_unsigned(u_quad_t, *tl++); 2511 len = fxdr_unsigned(int, *tl); 2512 } 2513 if (len <= 0 || len > NFS_MAXNAMLEN) { 2514 error = EBADRPC; 2515 m_freem(mrep); 2516 goto nfsmout; 2517 } 2518 /* for cookie stashing */ 2519 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2520 left = NFS_DIRFRAGSIZ - blksiz; 2521 if (reclen > left) { 2522 memset(uiop->uio_iov->iov_base, 0, left); 2523 dp->d_reclen += left; 2524 UIO_ADVANCE(uiop, left); 2525 blksiz = 0; 2526 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2527 } 2528 if (reclen > uiop->uio_resid) 2529 bigenough = 0; 2530 if (bigenough) { 2531 int tlen; 2532 2533 dp = (struct dirent *)uiop->uio_iov->iov_base; 2534 dp->d_fileno = fileno; 2535 dp->d_namlen = len; 2536 dp->d_reclen = reclen; 2537 dp->d_type = DT_UNKNOWN; 2538 blksiz += reclen; 2539 if (blksiz == NFS_DIRFRAGSIZ) 2540 blksiz = 0; 2541 UIO_ADVANCE(uiop, DIRHDSIZ); 2542 nfsm_mtouio(uiop, len); 2543 tlen = reclen - (DIRHDSIZ + len); 2544 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2545 UIO_ADVANCE(uiop, tlen); 2546 } else 2547 nfsm_adv(nfsm_rndup(len)); 2548 #ifndef NFS_V2_ONLY 2549 if (v3) { 2550 nfsm_dissect(tl, u_int32_t *, 2551 3 * NFSX_UNSIGNED); 2552 } else 2553 #endif 2554 { 2555 nfsm_dissect(tl, u_int32_t *, 2556 2 * NFSX_UNSIGNED); 2557 } 2558 if (bigenough) { 2559 #ifndef NFS_V2_ONLY 2560 if (v3) { 2561 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2562 uiop->uio_offset = 2563 fxdr_swapcookie3(tl); 2564 else 2565 uiop->uio_offset = 2566 fxdr_cookie3(tl); 2567 } 2568 else 2569 #endif 2570 { 2571 uiop->uio_offset = 2572 fxdr_unsigned(off_t, *tl); 2573 } 2574 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2575 } 2576 if (v3) 2577 tl += 2; 2578 else 2579 tl++; 2580 more_dirs = fxdr_unsigned(int, *tl); 2581 } 2582 /* 2583 * If at end of rpc data, get the eof boolean 2584 */ 2585 if (!more_dirs) { 2586 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2587 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2588 2589 /* 2590 * kludge: if we got no entries, treat it as EOF. 2591 * some server sometimes send a reply without any 2592 * entries or EOF. 2593 * although it might mean the server has very long name, 2594 * we can't handle such entries anyway. 2595 */ 2596 2597 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2598 more_dirs = 0; 2599 } 2600 m_freem(mrep); 2601 } 2602 /* 2603 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2604 * by increasing d_reclen for the last record. 2605 */ 2606 if (blksiz > 0) { 2607 left = NFS_DIRFRAGSIZ - blksiz; 2608 memset(uiop->uio_iov->iov_base, 0, left); 2609 dp->d_reclen += left; 2610 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2611 UIO_ADVANCE(uiop, left); 2612 } 2613 2614 /* 2615 * We are now either at the end of the directory or have filled the 2616 * block. 2617 */ 2618 if (bigenough) { 2619 dnp->n_direofoffset = uiop->uio_offset; 2620 dnp->n_flag |= NEOFVALID; 2621 } 2622 nfsmout: 2623 return (error); 2624 } 2625 2626 #ifndef NFS_V2_ONLY 2627 /* 2628 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2629 */ 2630 int 2631 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2632 { 2633 int len, left; 2634 struct dirent *dp = NULL; 2635 u_int32_t *tl; 2636 char *cp; 2637 int32_t t1, t2; 2638 struct vnode *newvp; 2639 char *bpos, *dpos, *cp2; 2640 struct mbuf *mreq, *mrep, *md, *mb; 2641 struct nameidata nami, *ndp = &nami; 2642 struct componentname *cnp = &ndp->ni_cnd; 2643 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2644 struct nfsnode *dnp = VTONFS(vp), *np; 2645 nfsfh_t *fhp; 2646 u_quad_t fileno; 2647 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2648 int attrflag, fhsize, nrpcs = 0, reclen; 2649 struct nfs_fattr fattr, *fp; 2650 2651 #ifdef DIAGNOSTIC 2652 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2653 panic("nfs readdirplusrpc bad uio"); 2654 #endif 2655 ndp->ni_dvp = vp; 2656 newvp = NULLVP; 2657 2658 /* 2659 * Loop around doing readdir rpc's of size nm_readdirsize 2660 * truncated to a multiple of NFS_DIRFRAGSIZ. 2661 * The stopping criteria is EOF or buffer full. 2662 */ 2663 while (more_dirs && bigenough) { 2664 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2665 bigenough = 0; 2666 break; 2667 } 2668 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2669 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2670 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2671 nfsm_fhtom(dnp, 1); 2672 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2673 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2674 txdr_swapcookie3(uiop->uio_offset, tl); 2675 } else { 2676 txdr_cookie3(uiop->uio_offset, tl); 2677 } 2678 tl += 2; 2679 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2680 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2681 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2682 *tl = txdr_unsigned(nmp->nm_rsize); 2683 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2684 nfsm_postop_attr(vp, attrflag, 0); 2685 if (error) { 2686 m_freem(mrep); 2687 goto nfsmout; 2688 } 2689 nrpcs++; 2690 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2691 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2692 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2693 more_dirs = fxdr_unsigned(int, *tl); 2694 2695 /* loop thru the dir entries, doctoring them to 4bsd form */ 2696 while (more_dirs && bigenough) { 2697 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2698 fileno = fxdr_hyper(tl); 2699 len = fxdr_unsigned(int, *(tl + 2)); 2700 if (len <= 0 || len > NFS_MAXNAMLEN) { 2701 error = EBADRPC; 2702 m_freem(mrep); 2703 goto nfsmout; 2704 } 2705 /* for cookie stashing */ 2706 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2707 left = NFS_DIRFRAGSIZ - blksiz; 2708 if (reclen > left) { 2709 /* 2710 * DIRFRAGSIZ is aligned, no need to align 2711 * again here. 2712 */ 2713 memset(uiop->uio_iov->iov_base, 0, left); 2714 dp->d_reclen += left; 2715 UIO_ADVANCE(uiop, left); 2716 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2717 blksiz = 0; 2718 } 2719 if (reclen > uiop->uio_resid) 2720 bigenough = 0; 2721 if (bigenough) { 2722 int tlen; 2723 2724 dp = (struct dirent *)uiop->uio_iov->iov_base; 2725 dp->d_fileno = fileno; 2726 dp->d_namlen = len; 2727 dp->d_reclen = reclen; 2728 dp->d_type = DT_UNKNOWN; 2729 blksiz += reclen; 2730 if (blksiz == NFS_DIRFRAGSIZ) 2731 blksiz = 0; 2732 UIO_ADVANCE(uiop, DIRHDSIZ); 2733 nfsm_mtouio(uiop, len); 2734 tlen = reclen - (DIRHDSIZ + len); 2735 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2736 UIO_ADVANCE(uiop, tlen); 2737 cnp->cn_nameptr = dp->d_name; 2738 cnp->cn_namelen = dp->d_namlen; 2739 } else 2740 nfsm_adv(nfsm_rndup(len)); 2741 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2742 if (bigenough) { 2743 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2744 uiop->uio_offset = 2745 fxdr_swapcookie3(tl); 2746 else 2747 uiop->uio_offset = 2748 fxdr_cookie3(tl); 2749 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2750 } 2751 tl += 2; 2752 2753 /* 2754 * Since the attributes are before the file handle 2755 * (sigh), we must skip over the attributes and then 2756 * come back and get them. 2757 */ 2758 attrflag = fxdr_unsigned(int, *tl); 2759 if (attrflag) { 2760 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2761 memcpy(&fattr, fp, NFSX_V3FATTR); 2762 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2763 doit = fxdr_unsigned(int, *tl); 2764 if (doit) { 2765 nfsm_getfh(fhp, fhsize, 1); 2766 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2767 vref(vp); 2768 newvp = vp; 2769 np = dnp; 2770 } else { 2771 error = nfs_nget1(vp->v_mount, fhp, 2772 fhsize, &np, LK_NOWAIT); 2773 if (!error) 2774 newvp = NFSTOV(np); 2775 } 2776 if (!error) { 2777 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2778 if (bigenough) { 2779 dp->d_type = 2780 IFTODT(VTTOIF(np->n_vattr->va_type)); 2781 if (cnp->cn_namelen <= NCHNAMLEN) { 2782 ndp->ni_vp = newvp; 2783 nfs_cache_enter(ndp->ni_dvp, 2784 ndp->ni_vp, cnp); 2785 } 2786 } 2787 } 2788 error = 0; 2789 } 2790 } else { 2791 /* Just skip over the file handle */ 2792 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2793 i = fxdr_unsigned(int, *tl); 2794 nfsm_adv(nfsm_rndup(i)); 2795 } 2796 if (newvp != NULLVP) { 2797 if (newvp == vp) 2798 vrele(newvp); 2799 else 2800 vput(newvp); 2801 newvp = NULLVP; 2802 } 2803 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2804 more_dirs = fxdr_unsigned(int, *tl); 2805 } 2806 /* 2807 * If at end of rpc data, get the eof boolean 2808 */ 2809 if (!more_dirs) { 2810 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2811 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2812 2813 /* 2814 * kludge: see a comment in nfs_readdirrpc. 2815 */ 2816 2817 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2818 more_dirs = 0; 2819 } 2820 m_freem(mrep); 2821 } 2822 /* 2823 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2824 * by increasing d_reclen for the last record. 2825 */ 2826 if (blksiz > 0) { 2827 left = NFS_DIRFRAGSIZ - blksiz; 2828 memset(uiop->uio_iov->iov_base, 0, left); 2829 dp->d_reclen += left; 2830 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2831 UIO_ADVANCE(uiop, left); 2832 } 2833 2834 /* 2835 * We are now either at the end of the directory or have filled the 2836 * block. 2837 */ 2838 if (bigenough) { 2839 dnp->n_direofoffset = uiop->uio_offset; 2840 dnp->n_flag |= NEOFVALID; 2841 } 2842 nfsmout: 2843 if (newvp != NULLVP) { 2844 if(newvp == vp) 2845 vrele(newvp); 2846 else 2847 vput(newvp); 2848 } 2849 return (error); 2850 } 2851 #endif 2852 2853 /* 2854 * Silly rename. To make the NFS filesystem that is stateless look a little 2855 * more like the "ufs" a remove of an active vnode is translated to a rename 2856 * to a funny looking filename that is removed by nfs_inactive on the 2857 * nfsnode. There is the potential for another process on a different client 2858 * to create the same funny name between the nfs_lookitup() fails and the 2859 * nfs_rename() completes, but... 2860 */ 2861 int 2862 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink) 2863 { 2864 struct sillyrename *sp; 2865 struct nfsnode *np; 2866 int error; 2867 pid_t pid; 2868 2869 cache_purge(dvp); 2870 np = VTONFS(vp); 2871 #ifndef DIAGNOSTIC 2872 if (vp->v_type == VDIR) 2873 panic("nfs: sillyrename dir"); 2874 #endif 2875 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2876 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2877 sp->s_dvp = dvp; 2878 vref(dvp); 2879 2880 /* Fudge together a funny name */ 2881 pid = curlwp->l_proc->p_pid; 2882 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 2883 sp->s_namlen = 12; 2884 sp->s_name[8] = hexdigits[pid & 0xf]; 2885 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 2886 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 2887 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 2888 2889 /* Try lookitups until we get one that isn't there */ 2890 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2891 curlwp, (struct nfsnode **)0) == 0) { 2892 sp->s_name[4]++; 2893 if (sp->s_name[4] > 'z') { 2894 error = EINVAL; 2895 goto bad; 2896 } 2897 } 2898 if (dolink) { 2899 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 2900 sp->s_cred, curlwp); 2901 /* 2902 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 2903 */ 2904 if (error == ENOTSUP) { 2905 error = nfs_renameit(dvp, cnp, sp); 2906 } 2907 } else { 2908 error = nfs_renameit(dvp, cnp, sp); 2909 } 2910 if (error) 2911 goto bad; 2912 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2913 curlwp, &np); 2914 np->n_sillyrename = sp; 2915 return (0); 2916 bad: 2917 vrele(sp->s_dvp); 2918 kauth_cred_free(sp->s_cred); 2919 kmem_free(sp, sizeof(*sp)); 2920 return (error); 2921 } 2922 2923 /* 2924 * Look up a file name and optionally either update the file handle or 2925 * allocate an nfsnode, depending on the value of npp. 2926 * npp == NULL --> just do the lookup 2927 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2928 * handled too 2929 * *npp != NULL --> update the file handle in the vnode 2930 */ 2931 int 2932 nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp) 2933 { 2934 u_int32_t *tl; 2935 char *cp; 2936 int32_t t1, t2; 2937 struct vnode *newvp = (struct vnode *)0; 2938 struct nfsnode *np, *dnp = VTONFS(dvp); 2939 char *bpos, *dpos, *cp2; 2940 int error = 0, ofhlen, fhlen; 2941 #ifndef NFS_V2_ONLY 2942 int attrflag; 2943 #endif 2944 struct mbuf *mreq, *mrep, *md, *mb; 2945 nfsfh_t *ofhp, *nfhp; 2946 const int v3 = NFS_ISV3(dvp); 2947 2948 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2949 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 2950 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2951 nfsm_fhtom(dnp, v3); 2952 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2953 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 2954 if (npp && !error) { 2955 nfsm_getfh(nfhp, fhlen, v3); 2956 if (*npp) { 2957 np = *npp; 2958 newvp = NFSTOV(np); 2959 ofhlen = np->n_fhsize; 2960 ofhp = kmem_alloc(ofhlen, KM_SLEEP); 2961 memcpy(ofhp, np->n_fhp, ofhlen); 2962 error = vcache_rekey_enter(newvp->v_mount, newvp, 2963 ofhp, ofhlen, nfhp, fhlen); 2964 if (error) { 2965 kmem_free(ofhp, ofhlen); 2966 m_freem(mrep); 2967 return error; 2968 } 2969 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2970 kmem_free(np->n_fhp, np->n_fhsize); 2971 np->n_fhp = &np->n_fh; 2972 } 2973 #if NFS_SMALLFH < NFSX_V3FHMAX 2974 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 2975 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 2976 #endif 2977 memcpy(np->n_fhp, nfhp, fhlen); 2978 np->n_fhsize = fhlen; 2979 vcache_rekey_exit(newvp->v_mount, newvp, 2980 ofhp, ofhlen, np->n_fhp, fhlen); 2981 kmem_free(ofhp, ofhlen); 2982 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2983 vref(dvp); 2984 newvp = dvp; 2985 np = dnp; 2986 } else { 2987 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2988 if (error) { 2989 m_freem(mrep); 2990 return (error); 2991 } 2992 newvp = NFSTOV(np); 2993 } 2994 #ifndef NFS_V2_ONLY 2995 if (v3) { 2996 nfsm_postop_attr(newvp, attrflag, 0); 2997 if (!attrflag && *npp == NULL) { 2998 m_freem(mrep); 2999 vput(newvp); 3000 return (ENOENT); 3001 } 3002 } else 3003 #endif 3004 nfsm_loadattr(newvp, (struct vattr *)0, 0); 3005 } 3006 nfsm_reqdone; 3007 if (npp && *npp == NULL) { 3008 if (error) { 3009 if (newvp) 3010 vput(newvp); 3011 } else 3012 *npp = np; 3013 } 3014 return (error); 3015 } 3016 3017 #ifndef NFS_V2_ONLY 3018 /* 3019 * Nfs Version 3 commit rpc 3020 */ 3021 int 3022 nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l) 3023 { 3024 char *cp; 3025 u_int32_t *tl; 3026 int32_t t1, t2; 3027 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3028 char *bpos, *dpos, *cp2; 3029 int error = 0, wccflag = NFSV3_WCCRATTR; 3030 struct mbuf *mreq, *mrep, *md, *mb; 3031 struct nfsnode *np; 3032 3033 KASSERT(NFS_ISV3(vp)); 3034 3035 #ifdef NFS_DEBUG_COMMIT 3036 printf("commit %lu - %lu\n", (unsigned long)offset, 3037 (unsigned long)(offset + cnt)); 3038 #endif 3039 3040 mutex_enter(&nmp->nm_lock); 3041 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 3042 mutex_exit(&nmp->nm_lock); 3043 return (0); 3044 } 3045 mutex_exit(&nmp->nm_lock); 3046 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3047 np = VTONFS(vp); 3048 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 3049 nfsm_fhtom(np, 1); 3050 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 3051 txdr_hyper(offset, tl); 3052 tl += 2; 3053 *tl = txdr_unsigned(cnt); 3054 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3055 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3056 if (!error) { 3057 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3058 mutex_enter(&nmp->nm_lock); 3059 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3060 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3061 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3062 error = NFSERR_STALEWRITEVERF; 3063 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3064 } 3065 mutex_exit(&nmp->nm_lock); 3066 } 3067 nfsm_reqdone; 3068 return (error); 3069 } 3070 #endif 3071 3072 /* 3073 * Kludge City.. 3074 * - make nfs_bmap() essentially a no-op that does no translation 3075 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3076 * (Maybe I could use the process's page mapping, but I was concerned that 3077 * Kernel Write might not be enabled and also figured copyout() would do 3078 * a lot more work than memcpy() and also it currently happens in the 3079 * context of the swapper process (2). 3080 */ 3081 int 3082 nfs_bmap(void *v) 3083 { 3084 struct vop_bmap_args /* { 3085 struct vnode *a_vp; 3086 daddr_t a_bn; 3087 struct vnode **a_vpp; 3088 daddr_t *a_bnp; 3089 int *a_runp; 3090 } */ *ap = v; 3091 struct vnode *vp = ap->a_vp; 3092 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3093 3094 if (ap->a_vpp != NULL) 3095 *ap->a_vpp = vp; 3096 if (ap->a_bnp != NULL) 3097 *ap->a_bnp = ap->a_bn << bshift; 3098 if (ap->a_runp != NULL) 3099 *ap->a_runp = 1024 * 1024; /* XXX */ 3100 return (0); 3101 } 3102 3103 /* 3104 * Strategy routine. 3105 * For async requests when nfsiod(s) are running, queue the request by 3106 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3107 * request. 3108 */ 3109 int 3110 nfs_strategy(void *v) 3111 { 3112 struct vop_strategy_args *ap = v; 3113 struct buf *bp = ap->a_bp; 3114 int error = 0; 3115 3116 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3117 panic("nfs physio/async"); 3118 3119 /* 3120 * If the op is asynchronous and an i/o daemon is waiting 3121 * queue the request, wake it up and wait for completion 3122 * otherwise just do it ourselves. 3123 */ 3124 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3125 error = nfs_doio(bp); 3126 return (error); 3127 } 3128 3129 /* 3130 * fsync vnode op. Just call nfs_flush() with commit == 1. 3131 */ 3132 /* ARGSUSED */ 3133 int 3134 nfs_fsync(void *v) 3135 { 3136 struct vop_fsync_args /* { 3137 struct vnodeop_desc *a_desc; 3138 struct vnode * a_vp; 3139 kauth_cred_t a_cred; 3140 int a_flags; 3141 off_t offlo; 3142 off_t offhi; 3143 struct lwp * a_l; 3144 } */ *ap = v; 3145 3146 struct vnode *vp = ap->a_vp; 3147 3148 if (vp->v_type != VREG) 3149 return 0; 3150 3151 return (nfs_flush(vp, ap->a_cred, 3152 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3153 } 3154 3155 /* 3156 * Flush all the data associated with a vnode. 3157 */ 3158 int 3159 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3160 int commit) 3161 { 3162 struct nfsnode *np = VTONFS(vp); 3163 int error; 3164 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3165 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3166 3167 mutex_enter(vp->v_interlock); 3168 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3169 if (np->n_flag & NWRITEERR) { 3170 error = np->n_error; 3171 np->n_flag &= ~NWRITEERR; 3172 } 3173 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3174 return (error); 3175 } 3176 3177 /* 3178 * Return POSIX pathconf information applicable to nfs. 3179 * 3180 * N.B. The NFS V2 protocol doesn't support this RPC. 3181 */ 3182 /* ARGSUSED */ 3183 int 3184 nfs_pathconf(void *v) 3185 { 3186 struct vop_pathconf_args /* { 3187 struct vnode *a_vp; 3188 int a_name; 3189 register_t *a_retval; 3190 } */ *ap = v; 3191 struct nfsv3_pathconf *pcp; 3192 struct vnode *vp = ap->a_vp; 3193 struct mbuf *mreq, *mrep, *md, *mb; 3194 int32_t t1, t2; 3195 u_int32_t *tl; 3196 char *bpos, *dpos, *cp, *cp2; 3197 int error = 0, attrflag; 3198 #ifndef NFS_V2_ONLY 3199 struct nfsmount *nmp; 3200 unsigned int l; 3201 u_int64_t maxsize; 3202 #endif 3203 const int v3 = NFS_ISV3(vp); 3204 struct nfsnode *np = VTONFS(vp); 3205 3206 switch (ap->a_name) { 3207 /* Names that can be resolved locally. */ 3208 case _PC_PIPE_BUF: 3209 *ap->a_retval = PIPE_BUF; 3210 break; 3211 case _PC_SYNC_IO: 3212 *ap->a_retval = 1; 3213 break; 3214 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3215 case _PC_LINK_MAX: 3216 case _PC_NAME_MAX: 3217 case _PC_CHOWN_RESTRICTED: 3218 case _PC_NO_TRUNC: 3219 if (!v3) { 3220 error = EINVAL; 3221 break; 3222 } 3223 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3224 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3225 nfsm_fhtom(np, 1); 3226 nfsm_request(np, NFSPROC_PATHCONF, 3227 curlwp, curlwp->l_cred); /* XXX */ 3228 nfsm_postop_attr(vp, attrflag, 0); 3229 if (!error) { 3230 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3231 NFSX_V3PATHCONF); 3232 switch (ap->a_name) { 3233 case _PC_LINK_MAX: 3234 *ap->a_retval = 3235 fxdr_unsigned(register_t, pcp->pc_linkmax); 3236 break; 3237 case _PC_NAME_MAX: 3238 *ap->a_retval = 3239 fxdr_unsigned(register_t, pcp->pc_namemax); 3240 break; 3241 case _PC_CHOWN_RESTRICTED: 3242 *ap->a_retval = 3243 (pcp->pc_chownrestricted == nfs_true); 3244 break; 3245 case _PC_NO_TRUNC: 3246 *ap->a_retval = 3247 (pcp->pc_notrunc == nfs_true); 3248 break; 3249 } 3250 } 3251 nfsm_reqdone; 3252 break; 3253 case _PC_FILESIZEBITS: 3254 #ifndef NFS_V2_ONLY 3255 if (v3) { 3256 nmp = VFSTONFS(vp->v_mount); 3257 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3258 if ((error = nfs_fsinfo(nmp, vp, 3259 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3260 break; 3261 for (l = 0, maxsize = nmp->nm_maxfilesize; 3262 (maxsize >> l) > 0; l++) 3263 ; 3264 *ap->a_retval = l + 1; 3265 } else 3266 #endif 3267 { 3268 *ap->a_retval = 32; /* NFS V2 limitation */ 3269 } 3270 break; 3271 default: 3272 error = EINVAL; 3273 break; 3274 } 3275 3276 return (error); 3277 } 3278 3279 /* 3280 * NFS advisory byte-level locks. 3281 */ 3282 int 3283 nfs_advlock(void *v) 3284 { 3285 struct vop_advlock_args /* { 3286 struct vnode *a_vp; 3287 void *a_id; 3288 int a_op; 3289 struct flock *a_fl; 3290 int a_flags; 3291 } */ *ap = v; 3292 struct nfsnode *np = VTONFS(ap->a_vp); 3293 3294 return lf_advlock(ap, &np->n_lockf, np->n_size); 3295 } 3296 3297 /* 3298 * Print out the contents of an nfsnode. 3299 */ 3300 int 3301 nfs_print(void *v) 3302 { 3303 struct vop_print_args /* { 3304 struct vnode *a_vp; 3305 } */ *ap = v; 3306 struct vnode *vp = ap->a_vp; 3307 struct nfsnode *np = VTONFS(vp); 3308 3309 printf("tag VT_NFS, fileid %lld fsid 0x%llx", 3310 (unsigned long long)np->n_vattr->va_fileid, 3311 (unsigned long long)np->n_vattr->va_fsid); 3312 if (vp->v_type == VFIFO) 3313 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 3314 printf("\n"); 3315 return (0); 3316 } 3317 3318 /* 3319 * nfs unlock wrapper. 3320 */ 3321 int 3322 nfs_unlock(void *v) 3323 { 3324 struct vop_unlock_args /* { 3325 struct vnode *a_vp; 3326 int a_flags; 3327 } */ *ap = v; 3328 struct vnode *vp = ap->a_vp; 3329 3330 /* 3331 * VOP_UNLOCK can be called by nfs_loadattrcache 3332 * with v_data == 0. 3333 */ 3334 if (VTONFS(vp)) { 3335 nfs_delayedtruncate(vp); 3336 } 3337 3338 return genfs_unlock(v); 3339 } 3340 3341 /* 3342 * nfs special file access vnode op. 3343 * Essentially just get vattr and then imitate iaccess() since the device is 3344 * local to the client. 3345 */ 3346 int 3347 nfsspec_access(void *v) 3348 { 3349 struct vop_access_args /* { 3350 struct vnode *a_vp; 3351 int a_mode; 3352 kauth_cred_t a_cred; 3353 struct lwp *a_l; 3354 } */ *ap = v; 3355 struct vattr va; 3356 struct vnode *vp = ap->a_vp; 3357 int error; 3358 3359 error = VOP_GETATTR(vp, &va, ap->a_cred); 3360 if (error) 3361 return (error); 3362 3363 /* 3364 * Disallow write attempts on filesystems mounted read-only; 3365 * unless the file is a socket, fifo, or a block or character 3366 * device resident on the filesystem. 3367 */ 3368 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3369 switch (vp->v_type) { 3370 case VREG: 3371 case VDIR: 3372 case VLNK: 3373 return (EROFS); 3374 default: 3375 break; 3376 } 3377 } 3378 3379 return kauth_authorize_vnode(ap->a_cred, KAUTH_ACCESS_ACTION(ap->a_mode, 3380 va.va_type, va.va_mode), vp, NULL, genfs_can_access(va.va_type, 3381 va.va_mode, va.va_uid, va.va_gid, ap->a_mode, ap->a_cred)); 3382 } 3383 3384 /* 3385 * Read wrapper for special devices. 3386 */ 3387 int 3388 nfsspec_read(void *v) 3389 { 3390 struct vop_read_args /* { 3391 struct vnode *a_vp; 3392 struct uio *a_uio; 3393 int a_ioflag; 3394 kauth_cred_t a_cred; 3395 } */ *ap = v; 3396 struct nfsnode *np = VTONFS(ap->a_vp); 3397 3398 /* 3399 * Set access flag. 3400 */ 3401 np->n_flag |= NACC; 3402 getnanotime(&np->n_atim); 3403 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3404 } 3405 3406 /* 3407 * Write wrapper for special devices. 3408 */ 3409 int 3410 nfsspec_write(void *v) 3411 { 3412 struct vop_write_args /* { 3413 struct vnode *a_vp; 3414 struct uio *a_uio; 3415 int a_ioflag; 3416 kauth_cred_t a_cred; 3417 } */ *ap = v; 3418 struct nfsnode *np = VTONFS(ap->a_vp); 3419 3420 /* 3421 * Set update flag. 3422 */ 3423 np->n_flag |= NUPD; 3424 getnanotime(&np->n_mtim); 3425 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3426 } 3427 3428 /* 3429 * Close wrapper for special devices. 3430 * 3431 * Update the times on the nfsnode then do device close. 3432 */ 3433 int 3434 nfsspec_close(void *v) 3435 { 3436 struct vop_close_args /* { 3437 struct vnode *a_vp; 3438 int a_fflag; 3439 kauth_cred_t a_cred; 3440 struct lwp *a_l; 3441 } */ *ap = v; 3442 struct vnode *vp = ap->a_vp; 3443 struct nfsnode *np = VTONFS(vp); 3444 struct vattr vattr; 3445 3446 if (np->n_flag & (NACC | NUPD)) { 3447 np->n_flag |= NCHG; 3448 if (vp->v_usecount == 1 && 3449 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3450 vattr_null(&vattr); 3451 if (np->n_flag & NACC) 3452 vattr.va_atime = np->n_atim; 3453 if (np->n_flag & NUPD) 3454 vattr.va_mtime = np->n_mtim; 3455 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3456 } 3457 } 3458 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3459 } 3460 3461 /* 3462 * Read wrapper for fifos. 3463 */ 3464 int 3465 nfsfifo_read(void *v) 3466 { 3467 struct vop_read_args /* { 3468 struct vnode *a_vp; 3469 struct uio *a_uio; 3470 int a_ioflag; 3471 kauth_cred_t a_cred; 3472 } */ *ap = v; 3473 struct nfsnode *np = VTONFS(ap->a_vp); 3474 3475 /* 3476 * Set access flag. 3477 */ 3478 np->n_flag |= NACC; 3479 getnanotime(&np->n_atim); 3480 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3481 } 3482 3483 /* 3484 * Write wrapper for fifos. 3485 */ 3486 int 3487 nfsfifo_write(void *v) 3488 { 3489 struct vop_write_args /* { 3490 struct vnode *a_vp; 3491 struct uio *a_uio; 3492 int a_ioflag; 3493 kauth_cred_t a_cred; 3494 } */ *ap = v; 3495 struct nfsnode *np = VTONFS(ap->a_vp); 3496 3497 /* 3498 * Set update flag. 3499 */ 3500 np->n_flag |= NUPD; 3501 getnanotime(&np->n_mtim); 3502 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3503 } 3504 3505 /* 3506 * Close wrapper for fifos. 3507 * 3508 * Update the times on the nfsnode then do fifo close. 3509 */ 3510 int 3511 nfsfifo_close(void *v) 3512 { 3513 struct vop_close_args /* { 3514 struct vnode *a_vp; 3515 int a_fflag; 3516 kauth_cred_t a_cred; 3517 struct lwp *a_l; 3518 } */ *ap = v; 3519 struct vnode *vp = ap->a_vp; 3520 struct nfsnode *np = VTONFS(vp); 3521 struct vattr vattr; 3522 3523 if (np->n_flag & (NACC | NUPD)) { 3524 struct timespec ts; 3525 3526 getnanotime(&ts); 3527 if (np->n_flag & NACC) 3528 np->n_atim = ts; 3529 if (np->n_flag & NUPD) 3530 np->n_mtim = ts; 3531 np->n_flag |= NCHG; 3532 if (vp->v_usecount == 1 && 3533 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3534 vattr_null(&vattr); 3535 if (np->n_flag & NACC) 3536 vattr.va_atime = np->n_atim; 3537 if (np->n_flag & NUPD) 3538 vattr.va_mtime = np->n_mtim; 3539 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3540 } 3541 } 3542 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3543 } 3544