1 /* $NetBSD: nfs_vnops.c,v 1.293 2011/11/28 08:05:06 tls 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 1.293 2011/11/28 08:05:06 tls 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_fcntl_desc, genfs_fcntl }, /* fcntl */ 111 { &vop_ioctl_desc, nfs_ioctl }, /* ioctl */ 112 { &vop_poll_desc, nfs_poll }, /* poll */ 113 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 114 { &vop_revoke_desc, nfs_revoke }, /* revoke */ 115 { &vop_mmap_desc, nfs_mmap }, /* mmap */ 116 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 117 { &vop_seek_desc, nfs_seek }, /* seek */ 118 { &vop_remove_desc, nfs_remove }, /* remove */ 119 { &vop_link_desc, nfs_link }, /* link */ 120 { &vop_rename_desc, nfs_rename }, /* rename */ 121 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 122 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 123 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 124 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 125 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 126 { &vop_abortop_desc, nfs_abortop }, /* abortop */ 127 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 128 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 129 { &vop_lock_desc, nfs_lock }, /* lock */ 130 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 131 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 132 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 133 { &vop_print_desc, nfs_print }, /* print */ 134 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 135 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 136 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 137 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 138 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 139 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 140 { NULL, NULL } 141 }; 142 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 143 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 144 145 /* 146 * Special device vnode ops 147 */ 148 int (**spec_nfsv2nodeop_p)(void *); 149 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 150 { &vop_default_desc, vn_default_error }, 151 { &vop_lookup_desc, spec_lookup }, /* lookup */ 152 { &vop_create_desc, spec_create }, /* create */ 153 { &vop_mknod_desc, spec_mknod }, /* mknod */ 154 { &vop_open_desc, spec_open }, /* open */ 155 { &vop_close_desc, nfsspec_close }, /* close */ 156 { &vop_access_desc, nfsspec_access }, /* access */ 157 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 158 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 159 { &vop_read_desc, nfsspec_read }, /* read */ 160 { &vop_write_desc, nfsspec_write }, /* write */ 161 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 162 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 163 { &vop_poll_desc, spec_poll }, /* poll */ 164 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 165 { &vop_revoke_desc, spec_revoke }, /* revoke */ 166 { &vop_mmap_desc, spec_mmap }, /* mmap */ 167 { &vop_fsync_desc, spec_fsync }, /* fsync */ 168 { &vop_seek_desc, spec_seek }, /* seek */ 169 { &vop_remove_desc, spec_remove }, /* remove */ 170 { &vop_link_desc, spec_link }, /* link */ 171 { &vop_rename_desc, spec_rename }, /* rename */ 172 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 173 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 174 { &vop_symlink_desc, spec_symlink }, /* symlink */ 175 { &vop_readdir_desc, spec_readdir }, /* readdir */ 176 { &vop_readlink_desc, spec_readlink }, /* readlink */ 177 { &vop_abortop_desc, spec_abortop }, /* abortop */ 178 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 179 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 180 { &vop_lock_desc, nfs_lock }, /* lock */ 181 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 182 { &vop_bmap_desc, spec_bmap }, /* bmap */ 183 { &vop_strategy_desc, spec_strategy }, /* strategy */ 184 { &vop_print_desc, nfs_print }, /* print */ 185 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 186 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 187 { &vop_advlock_desc, spec_advlock }, /* advlock */ 188 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 189 { &vop_getpages_desc, spec_getpages }, /* getpages */ 190 { &vop_putpages_desc, spec_putpages }, /* putpages */ 191 { NULL, NULL } 192 }; 193 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 194 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 195 196 int (**fifo_nfsv2nodeop_p)(void *); 197 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 198 { &vop_default_desc, vn_default_error }, 199 { &vop_lookup_desc, vn_fifo_bypass }, /* lookup */ 200 { &vop_create_desc, vn_fifo_bypass }, /* create */ 201 { &vop_mknod_desc, vn_fifo_bypass }, /* mknod */ 202 { &vop_open_desc, vn_fifo_bypass }, /* open */ 203 { &vop_close_desc, nfsfifo_close }, /* close */ 204 { &vop_access_desc, nfsspec_access }, /* access */ 205 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 206 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 207 { &vop_read_desc, nfsfifo_read }, /* read */ 208 { &vop_write_desc, nfsfifo_write }, /* write */ 209 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 210 { &vop_ioctl_desc, vn_fifo_bypass }, /* ioctl */ 211 { &vop_poll_desc, vn_fifo_bypass }, /* poll */ 212 { &vop_kqfilter_desc, vn_fifo_bypass }, /* kqfilter */ 213 { &vop_revoke_desc, vn_fifo_bypass }, /* revoke */ 214 { &vop_mmap_desc, vn_fifo_bypass }, /* mmap */ 215 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 216 { &vop_seek_desc, vn_fifo_bypass }, /* seek */ 217 { &vop_remove_desc, vn_fifo_bypass }, /* remove */ 218 { &vop_link_desc, vn_fifo_bypass }, /* link */ 219 { &vop_rename_desc, vn_fifo_bypass }, /* rename */ 220 { &vop_mkdir_desc, vn_fifo_bypass }, /* mkdir */ 221 { &vop_rmdir_desc, vn_fifo_bypass }, /* rmdir */ 222 { &vop_symlink_desc, vn_fifo_bypass }, /* symlink */ 223 { &vop_readdir_desc, vn_fifo_bypass }, /* readdir */ 224 { &vop_readlink_desc, vn_fifo_bypass }, /* readlink */ 225 { &vop_abortop_desc, vn_fifo_bypass }, /* abortop */ 226 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 227 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 228 { &vop_lock_desc, nfs_lock }, /* lock */ 229 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 230 { &vop_bmap_desc, vn_fifo_bypass }, /* bmap */ 231 { &vop_strategy_desc, genfs_badop }, /* strategy */ 232 { &vop_print_desc, nfs_print }, /* print */ 233 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 234 { &vop_pathconf_desc, vn_fifo_bypass }, /* pathconf */ 235 { &vop_advlock_desc, vn_fifo_bypass }, /* advlock */ 236 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 237 { &vop_putpages_desc, vn_fifo_bypass }, /* putpages */ 238 { NULL, NULL } 239 }; 240 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 241 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 242 243 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 244 size_t, kauth_cred_t, struct lwp *); 245 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 246 247 /* 248 * Global variables 249 */ 250 extern u_int32_t nfs_true, nfs_false; 251 extern u_int32_t nfs_xdrneg1; 252 extern const nfstype nfsv3_type[9]; 253 254 int nfs_numasync = 0; 255 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 256 #define UIO_ADVANCE(uio, siz) \ 257 (void)((uio)->uio_resid -= (siz), \ 258 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 259 (uio)->uio_iov->iov_len -= (siz)) 260 261 static void nfs_cache_enter(struct vnode *, struct vnode *, 262 struct componentname *); 263 264 static void 265 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 266 struct componentname *cnp) 267 { 268 struct nfsnode *dnp = VTONFS(dvp); 269 270 if (vp != NULL) { 271 struct nfsnode *np = VTONFS(vp); 272 273 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 274 } 275 276 if (!timespecisset(&dnp->n_nctime)) 277 dnp->n_nctime = dnp->n_vattr->va_mtime; 278 279 cache_enter(dvp, vp, cnp); 280 } 281 282 /* 283 * nfs null call from vfs. 284 */ 285 int 286 nfs_null(struct vnode *vp, kauth_cred_t cred, struct lwp *l) 287 { 288 char *bpos, *dpos; 289 int error = 0; 290 struct mbuf *mreq, *mrep, *md, *mb; 291 struct nfsnode *np = VTONFS(vp); 292 293 nfsm_reqhead(np, NFSPROC_NULL, 0); 294 nfsm_request(np, NFSPROC_NULL, l, cred); 295 nfsm_reqdone; 296 return (error); 297 } 298 299 /* 300 * nfs access vnode op. 301 * For nfs version 2, just return ok. File accesses may fail later. 302 * For nfs version 3, use the access rpc to check accessibility. If file modes 303 * are changed on the server, accesses might still fail later. 304 */ 305 int 306 nfs_access(void *v) 307 { 308 struct vop_access_args /* { 309 struct vnode *a_vp; 310 int a_mode; 311 kauth_cred_t a_cred; 312 } */ *ap = v; 313 struct vnode *vp = ap->a_vp; 314 #ifndef NFS_V2_ONLY 315 u_int32_t *tl; 316 char *cp; 317 int32_t t1, t2; 318 char *bpos, *dpos, *cp2; 319 int error = 0, attrflag; 320 struct mbuf *mreq, *mrep, *md, *mb; 321 u_int32_t mode, rmode; 322 const int v3 = NFS_ISV3(vp); 323 #endif 324 int cachevalid; 325 struct nfsnode *np = VTONFS(vp); 326 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 327 328 cachevalid = (np->n_accstamp != -1 && 329 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 330 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 331 332 /* 333 * Check access cache first. If this request has been made for this 334 * uid shortly before, use the cached result. 335 */ 336 if (cachevalid) { 337 if (!np->n_accerror) { 338 if ((np->n_accmode & ap->a_mode) == ap->a_mode) 339 return np->n_accerror; 340 } else if ((np->n_accmode & ap->a_mode) == np->n_accmode) 341 return np->n_accerror; 342 } 343 344 #ifndef NFS_V2_ONLY 345 /* 346 * For nfs v3, do an access rpc, otherwise you are stuck emulating 347 * ufs_access() locally using the vattr. This may not be correct, 348 * since the server may apply other access criteria such as 349 * client uid-->server uid mapping that we do not know about, but 350 * this is better than just returning anything that is lying about 351 * in the cache. 352 */ 353 if (v3) { 354 nfsstats.rpccnt[NFSPROC_ACCESS]++; 355 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 356 nfsm_fhtom(np, v3); 357 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 358 if (ap->a_mode & VREAD) 359 mode = NFSV3ACCESS_READ; 360 else 361 mode = 0; 362 if (vp->v_type != VDIR) { 363 if (ap->a_mode & VWRITE) 364 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 365 if (ap->a_mode & VEXEC) 366 mode |= NFSV3ACCESS_EXECUTE; 367 } else { 368 if (ap->a_mode & VWRITE) 369 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 370 NFSV3ACCESS_DELETE); 371 if (ap->a_mode & VEXEC) 372 mode |= NFSV3ACCESS_LOOKUP; 373 } 374 *tl = txdr_unsigned(mode); 375 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 376 nfsm_postop_attr(vp, attrflag, 0); 377 if (!error) { 378 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 379 rmode = fxdr_unsigned(u_int32_t, *tl); 380 /* 381 * The NFS V3 spec does not clarify whether or not 382 * the returned access bits can be a superset of 383 * the ones requested, so... 384 */ 385 if ((rmode & mode) != mode) 386 error = EACCES; 387 } 388 nfsm_reqdone; 389 } else 390 #endif 391 return (nfsspec_access(ap)); 392 #ifndef NFS_V2_ONLY 393 /* 394 * Disallow write attempts on filesystems mounted read-only; 395 * unless the file is a socket, fifo, or a block or character 396 * device resident on the filesystem. 397 */ 398 if (!error && (ap->a_mode & VWRITE) && 399 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 400 switch (vp->v_type) { 401 case VREG: 402 case VDIR: 403 case VLNK: 404 error = EROFS; 405 default: 406 break; 407 } 408 } 409 410 if (!error || error == EACCES) { 411 /* 412 * If we got the same result as for a previous, 413 * different request, OR it in. Don't update 414 * the timestamp in that case. 415 */ 416 if (cachevalid && np->n_accstamp != -1 && 417 error == np->n_accerror) { 418 if (!error) 419 np->n_accmode |= ap->a_mode; 420 else if ((np->n_accmode & ap->a_mode) == ap->a_mode) 421 np->n_accmode = ap->a_mode; 422 } else { 423 np->n_accstamp = time_uptime; 424 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 425 np->n_accmode = ap->a_mode; 426 np->n_accerror = error; 427 } 428 } 429 430 return (error); 431 #endif 432 } 433 434 /* 435 * nfs open vnode op 436 * Check to see if the type is ok 437 * and that deletion is not in progress. 438 * For paged in text files, you will need to flush the page cache 439 * if consistency is lost. 440 */ 441 /* ARGSUSED */ 442 int 443 nfs_open(void *v) 444 { 445 struct vop_open_args /* { 446 struct vnode *a_vp; 447 int a_mode; 448 kauth_cred_t a_cred; 449 } */ *ap = v; 450 struct vnode *vp = ap->a_vp; 451 struct nfsnode *np = VTONFS(vp); 452 int error; 453 454 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 455 return (EACCES); 456 } 457 458 if (ap->a_mode & FREAD) { 459 if (np->n_rcred != NULL) 460 kauth_cred_free(np->n_rcred); 461 np->n_rcred = ap->a_cred; 462 kauth_cred_hold(np->n_rcred); 463 } 464 if (ap->a_mode & FWRITE) { 465 if (np->n_wcred != NULL) 466 kauth_cred_free(np->n_wcred); 467 np->n_wcred = ap->a_cred; 468 kauth_cred_hold(np->n_wcred); 469 } 470 471 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 472 if (error) 473 return error; 474 475 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 476 477 return (0); 478 } 479 480 /* 481 * nfs close vnode op 482 * What an NFS client should do upon close after writing is a debatable issue. 483 * Most NFS clients push delayed writes to the server upon close, basically for 484 * two reasons: 485 * 1 - So that any write errors may be reported back to the client process 486 * doing the close system call. By far the two most likely errors are 487 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 488 * 2 - To put a worst case upper bound on cache inconsistency between 489 * multiple clients for the file. 490 * There is also a consistency problem for Version 2 of the protocol w.r.t. 491 * not being able to tell if other clients are writing a file concurrently, 492 * since there is no way of knowing if the changed modify time in the reply 493 * is only due to the write for this client. 494 * (NFS Version 3 provides weak cache consistency data in the reply that 495 * should be sufficient to detect and handle this case.) 496 * 497 * The current code does the following: 498 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 499 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 500 * or commit them (this satisfies 1 and 2 except for the 501 * case where the server crashes after this close but 502 * before the commit RPC, which is felt to be "good 503 * enough". Changing the last argument to nfs_flush() to 504 * a 1 would force a commit operation, if it is felt a 505 * commit is necessary now. 506 */ 507 /* ARGSUSED */ 508 int 509 nfs_close(void *v) 510 { 511 struct vop_close_args /* { 512 struct vnodeop_desc *a_desc; 513 struct vnode *a_vp; 514 int a_fflag; 515 kauth_cred_t a_cred; 516 } */ *ap = v; 517 struct vnode *vp = ap->a_vp; 518 struct nfsnode *np = VTONFS(vp); 519 int error = 0; 520 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 521 522 if (vp->v_type == VREG) { 523 if (np->n_flag & NMODIFIED) { 524 #ifndef NFS_V2_ONLY 525 if (NFS_ISV3(vp)) { 526 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 527 np->n_flag &= ~NMODIFIED; 528 } else 529 #endif 530 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 531 NFS_INVALIDATE_ATTRCACHE(np); 532 } 533 if (np->n_flag & NWRITEERR) { 534 np->n_flag &= ~NWRITEERR; 535 error = np->n_error; 536 } 537 } 538 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 539 return (error); 540 } 541 542 /* 543 * nfs getattr call from vfs. 544 */ 545 int 546 nfs_getattr(void *v) 547 { 548 struct vop_getattr_args /* { 549 struct vnode *a_vp; 550 struct vattr *a_vap; 551 kauth_cred_t a_cred; 552 } */ *ap = v; 553 struct vnode *vp = ap->a_vp; 554 struct nfsnode *np = VTONFS(vp); 555 char *cp; 556 u_int32_t *tl; 557 int32_t t1, t2; 558 char *bpos, *dpos; 559 int error = 0; 560 struct mbuf *mreq, *mrep, *md, *mb; 561 const int v3 = NFS_ISV3(vp); 562 563 /* 564 * Update local times for special files. 565 */ 566 if (np->n_flag & (NACC | NUPD)) 567 np->n_flag |= NCHG; 568 569 /* 570 * if we have delayed truncation, do it now. 571 */ 572 nfs_delayedtruncate(vp); 573 574 /* 575 * First look in the cache. 576 */ 577 if (nfs_getattrcache(vp, ap->a_vap) == 0) 578 return (0); 579 nfsstats.rpccnt[NFSPROC_GETATTR]++; 580 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 581 nfsm_fhtom(np, v3); 582 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 583 if (!error) { 584 nfsm_loadattr(vp, ap->a_vap, 0); 585 if (vp->v_type == VDIR && 586 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 587 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 588 } 589 nfsm_reqdone; 590 return (error); 591 } 592 593 /* 594 * nfs setattr call. 595 */ 596 int 597 nfs_setattr(void *v) 598 { 599 struct vop_setattr_args /* { 600 struct vnodeop_desc *a_desc; 601 struct vnode *a_vp; 602 struct vattr *a_vap; 603 kauth_cred_t a_cred; 604 } */ *ap = v; 605 struct vnode *vp = ap->a_vp; 606 struct nfsnode *np = VTONFS(vp); 607 struct vattr *vap = ap->a_vap; 608 int error = 0; 609 u_quad_t tsize = 0; 610 611 /* 612 * Setting of flags is not supported. 613 */ 614 if (vap->va_flags != VNOVAL) 615 return (EOPNOTSUPP); 616 617 /* 618 * Disallow write attempts if the filesystem is mounted read-only. 619 */ 620 if ((vap->va_uid != (uid_t)VNOVAL || 621 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 622 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 623 (vp->v_mount->mnt_flag & MNT_RDONLY)) 624 return (EROFS); 625 if (vap->va_size != VNOVAL) { 626 if (vap->va_size > VFSTONFS(vp->v_mount)->nm_maxfilesize) { 627 return EFBIG; 628 } 629 switch (vp->v_type) { 630 case VDIR: 631 return (EISDIR); 632 case VCHR: 633 case VBLK: 634 case VSOCK: 635 case VFIFO: 636 if (vap->va_mtime.tv_sec == VNOVAL && 637 vap->va_atime.tv_sec == VNOVAL && 638 vap->va_mode == (mode_t)VNOVAL && 639 vap->va_uid == (uid_t)VNOVAL && 640 vap->va_gid == (gid_t)VNOVAL) 641 return (0); 642 vap->va_size = VNOVAL; 643 break; 644 default: 645 /* 646 * Disallow write attempts if the filesystem is 647 * mounted read-only. 648 */ 649 if (vp->v_mount->mnt_flag & MNT_RDONLY) 650 return (EROFS); 651 genfs_node_wrlock(vp); 652 uvm_vnp_setsize(vp, vap->va_size); 653 tsize = np->n_size; 654 np->n_size = vap->va_size; 655 if (vap->va_size == 0) 656 error = nfs_vinvalbuf(vp, 0, 657 ap->a_cred, curlwp, 1); 658 else 659 error = nfs_vinvalbuf(vp, V_SAVE, 660 ap->a_cred, curlwp, 1); 661 if (error) { 662 uvm_vnp_setsize(vp, tsize); 663 genfs_node_unlock(vp); 664 return (error); 665 } 666 np->n_vattr->va_size = vap->va_size; 667 } 668 } else { 669 /* 670 * flush files before setattr because a later write of 671 * cached data might change timestamps or reset sugid bits 672 */ 673 if ((vap->va_mtime.tv_sec != VNOVAL || 674 vap->va_atime.tv_sec != VNOVAL || 675 vap->va_mode != VNOVAL) && 676 vp->v_type == VREG && 677 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 678 curlwp, 1)) == EINTR) 679 return (error); 680 } 681 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 682 if (vap->va_size != VNOVAL) { 683 if (error) { 684 np->n_size = np->n_vattr->va_size = tsize; 685 uvm_vnp_setsize(vp, np->n_size); 686 } 687 genfs_node_unlock(vp); 688 } 689 VN_KNOTE(vp, NOTE_ATTRIB); 690 return (error); 691 } 692 693 /* 694 * Do an nfs setattr rpc. 695 */ 696 int 697 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, kauth_cred_t cred, struct lwp *l) 698 { 699 struct nfsv2_sattr *sp; 700 char *cp; 701 int32_t t1, t2; 702 char *bpos, *dpos; 703 u_int32_t *tl; 704 int error = 0; 705 struct mbuf *mreq, *mrep, *md, *mb; 706 const int v3 = NFS_ISV3(vp); 707 struct nfsnode *np = VTONFS(vp); 708 #ifndef NFS_V2_ONLY 709 int wccflag = NFSV3_WCCRATTR; 710 char *cp2; 711 #endif 712 713 nfsstats.rpccnt[NFSPROC_SETATTR]++; 714 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 715 nfsm_fhtom(np, v3); 716 #ifndef NFS_V2_ONLY 717 if (v3) { 718 nfsm_v3attrbuild(vap, true); 719 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 720 *tl = nfs_false; 721 } else { 722 #endif 723 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 724 if (vap->va_mode == (mode_t)VNOVAL) 725 sp->sa_mode = nfs_xdrneg1; 726 else 727 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 728 if (vap->va_uid == (uid_t)VNOVAL) 729 sp->sa_uid = nfs_xdrneg1; 730 else 731 sp->sa_uid = txdr_unsigned(vap->va_uid); 732 if (vap->va_gid == (gid_t)VNOVAL) 733 sp->sa_gid = nfs_xdrneg1; 734 else 735 sp->sa_gid = txdr_unsigned(vap->va_gid); 736 sp->sa_size = txdr_unsigned(vap->va_size); 737 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 738 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 739 #ifndef NFS_V2_ONLY 740 } 741 #endif 742 nfsm_request(np, NFSPROC_SETATTR, l, cred); 743 #ifndef NFS_V2_ONLY 744 if (v3) { 745 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 746 } else 747 #endif 748 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 749 nfsm_reqdone; 750 return (error); 751 } 752 753 /* 754 * nfs lookup call, one step at a time... 755 * First look in cache 756 * If not found, do the rpc. 757 */ 758 int 759 nfs_lookup(void *v) 760 { 761 struct vop_lookup_args /* { 762 struct vnodeop_desc *a_desc; 763 struct vnode *a_dvp; 764 struct vnode **a_vpp; 765 struct componentname *a_cnp; 766 } */ *ap = v; 767 struct componentname *cnp = ap->a_cnp; 768 struct vnode *dvp = ap->a_dvp; 769 struct vnode **vpp = ap->a_vpp; 770 int flags; 771 struct vnode *newvp; 772 u_int32_t *tl; 773 char *cp; 774 int32_t t1, t2; 775 char *bpos, *dpos, *cp2; 776 struct mbuf *mreq, *mrep, *md, *mb; 777 long len; 778 nfsfh_t *fhp; 779 struct nfsnode *np; 780 int error = 0, attrflag, fhsize; 781 const int v3 = NFS_ISV3(dvp); 782 783 flags = cnp->cn_flags; 784 785 *vpp = NULLVP; 786 newvp = NULLVP; 787 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 788 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 789 return (EROFS); 790 if (dvp->v_type != VDIR) 791 return (ENOTDIR); 792 793 /* 794 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 795 */ 796 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 797 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 798 if (error) 799 return error; 800 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 801 return EISDIR; 802 vref(dvp); 803 *vpp = dvp; 804 return 0; 805 } 806 807 np = VTONFS(dvp); 808 809 /* 810 * Before performing an RPC, check the name cache to see if 811 * the directory/name pair we are looking for is known already. 812 * If the directory/name pair is found in the name cache, 813 * we have to ensure the directory has not changed from 814 * the time the cache entry has been created. If it has, 815 * the cache entry has to be ignored. 816 */ 817 error = cache_lookup_raw(dvp, vpp, cnp); 818 KASSERT(dvp != *vpp); 819 KASSERT((cnp->cn_flags & ISWHITEOUT) == 0); 820 if (error >= 0) { 821 struct vattr vattr; 822 int err2; 823 824 if (error && error != ENOENT) { 825 *vpp = NULLVP; 826 return error; 827 } 828 829 err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 830 if (err2 != 0) { 831 if (error == 0) 832 vrele(*vpp); 833 *vpp = NULLVP; 834 return err2; 835 } 836 837 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 838 || timespeccmp(&vattr.va_mtime, 839 &VTONFS(dvp)->n_nctime, !=)) { 840 if (error == 0) { 841 vrele(*vpp); 842 *vpp = NULLVP; 843 } 844 cache_purge1(dvp, NULL, PURGE_CHILDREN); 845 timespecclear(&np->n_nctime); 846 goto dorpc; 847 } 848 849 if (error == ENOENT) { 850 goto noentry; 851 } 852 853 /* 854 * investigate the vnode returned by cache_lookup_raw. 855 * if it isn't appropriate, do an rpc. 856 */ 857 newvp = *vpp; 858 if ((flags & ISDOTDOT) != 0) { 859 VOP_UNLOCK(dvp); 860 } 861 error = vn_lock(newvp, LK_EXCLUSIVE); 862 if ((flags & ISDOTDOT) != 0) { 863 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 864 } 865 if (error != 0) { 866 /* newvp has been reclaimed. */ 867 vrele(newvp); 868 *vpp = NULLVP; 869 goto dorpc; 870 } 871 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 872 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 873 nfsstats.lookupcache_hits++; 874 KASSERT(newvp->v_type != VNON); 875 return (0); 876 } 877 cache_purge1(newvp, NULL, PURGE_PARENTS); 878 vput(newvp); 879 *vpp = NULLVP; 880 } 881 dorpc: 882 #if 0 883 /* 884 * because nfsv3 has the same CREATE semantics as ours, 885 * we don't have to perform LOOKUPs beforehand. 886 * 887 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 888 * XXX although we have no way to know if O_EXCL is requested or not. 889 */ 890 891 if (v3 && cnp->cn_nameiop == CREATE && 892 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 893 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 894 return (EJUSTRETURN); 895 } 896 #endif /* 0 */ 897 898 error = 0; 899 newvp = NULLVP; 900 nfsstats.lookupcache_misses++; 901 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 902 len = cnp->cn_namelen; 903 nfsm_reqhead(np, NFSPROC_LOOKUP, 904 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 905 nfsm_fhtom(np, v3); 906 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 907 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 908 if (error) { 909 nfsm_postop_attr(dvp, attrflag, 0); 910 m_freem(mrep); 911 goto nfsmout; 912 } 913 nfsm_getfh(fhp, fhsize, v3); 914 915 /* 916 * Handle RENAME case... 917 */ 918 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 919 if (NFS_CMPFH(np, fhp, fhsize)) { 920 m_freem(mrep); 921 return (EISDIR); 922 } 923 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 924 if (error) { 925 m_freem(mrep); 926 return error; 927 } 928 newvp = NFSTOV(np); 929 #ifndef NFS_V2_ONLY 930 if (v3) { 931 nfsm_postop_attr(newvp, attrflag, 0); 932 nfsm_postop_attr(dvp, attrflag, 0); 933 } else 934 #endif 935 nfsm_loadattr(newvp, (struct vattr *)0, 0); 936 *vpp = newvp; 937 m_freem(mrep); 938 goto validate; 939 } 940 941 /* 942 * The postop attr handling is duplicated for each if case, 943 * because it should be done while dvp is locked (unlocking 944 * dvp is different for each case). 945 */ 946 947 if (NFS_CMPFH(np, fhp, fhsize)) { 948 /* 949 * as we handle "." lookup locally, this should be 950 * a broken server. 951 */ 952 vref(dvp); 953 newvp = dvp; 954 #ifndef NFS_V2_ONLY 955 if (v3) { 956 nfsm_postop_attr(newvp, attrflag, 0); 957 nfsm_postop_attr(dvp, attrflag, 0); 958 } else 959 #endif 960 nfsm_loadattr(newvp, (struct vattr *)0, 0); 961 } else if (flags & ISDOTDOT) { 962 /* 963 * ".." lookup 964 */ 965 VOP_UNLOCK(dvp); 966 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 967 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 968 if (error) { 969 m_freem(mrep); 970 return error; 971 } 972 newvp = NFSTOV(np); 973 974 #ifndef NFS_V2_ONLY 975 if (v3) { 976 nfsm_postop_attr(newvp, attrflag, 0); 977 nfsm_postop_attr(dvp, attrflag, 0); 978 } else 979 #endif 980 nfsm_loadattr(newvp, (struct vattr *)0, 0); 981 } else { 982 /* 983 * Other lookups. 984 */ 985 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 986 if (error) { 987 m_freem(mrep); 988 return error; 989 } 990 newvp = NFSTOV(np); 991 #ifndef NFS_V2_ONLY 992 if (v3) { 993 nfsm_postop_attr(newvp, attrflag, 0); 994 nfsm_postop_attr(dvp, attrflag, 0); 995 } else 996 #endif 997 nfsm_loadattr(newvp, (struct vattr *)0, 0); 998 } 999 if ((cnp->cn_flags & MAKEENTRY) && 1000 (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_flags & MAKEENTRY) && 1013 cnp->cn_nameiop != CREATE) { 1014 nfs_cache_enter(dvp, NULL, cnp); 1015 } 1016 if (newvp != NULLVP) { 1017 if (newvp == dvp) { 1018 vrele(newvp); 1019 } else { 1020 vput(newvp); 1021 } 1022 } 1023 noentry: 1024 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1025 (flags & ISLASTCN) && error == ENOENT) { 1026 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 1027 error = EROFS; 1028 } else { 1029 error = EJUSTRETURN; 1030 } 1031 } 1032 *vpp = NULL; 1033 return error; 1034 } 1035 1036 validate: 1037 /* 1038 * make sure we have valid type and size. 1039 */ 1040 1041 newvp = *vpp; 1042 if (newvp->v_type == VNON) { 1043 struct vattr vattr; /* dummy */ 1044 1045 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1046 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1047 if (error) { 1048 vput(newvp); 1049 *vpp = NULL; 1050 } 1051 } 1052 1053 return error; 1054 } 1055 1056 /* 1057 * nfs read call. 1058 * Just call nfs_bioread() to do the work. 1059 */ 1060 int 1061 nfs_read(void *v) 1062 { 1063 struct vop_read_args /* { 1064 struct vnode *a_vp; 1065 struct uio *a_uio; 1066 int a_ioflag; 1067 kauth_cred_t a_cred; 1068 } */ *ap = v; 1069 struct vnode *vp = ap->a_vp; 1070 1071 if (vp->v_type != VREG) 1072 return EISDIR; 1073 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1074 } 1075 1076 /* 1077 * nfs readlink call 1078 */ 1079 int 1080 nfs_readlink(void *v) 1081 { 1082 struct vop_readlink_args /* { 1083 struct vnode *a_vp; 1084 struct uio *a_uio; 1085 kauth_cred_t a_cred; 1086 } */ *ap = v; 1087 struct vnode *vp = ap->a_vp; 1088 struct nfsnode *np = VTONFS(vp); 1089 1090 if (vp->v_type != VLNK) 1091 return (EPERM); 1092 1093 if (np->n_rcred != NULL) { 1094 kauth_cred_free(np->n_rcred); 1095 } 1096 np->n_rcred = ap->a_cred; 1097 kauth_cred_hold(np->n_rcred); 1098 1099 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1100 } 1101 1102 /* 1103 * Do a readlink rpc. 1104 * Called by nfs_doio() from below the buffer cache. 1105 */ 1106 int 1107 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 1108 { 1109 u_int32_t *tl; 1110 char *cp; 1111 int32_t t1, t2; 1112 char *bpos, *dpos, *cp2; 1113 int error = 0; 1114 uint32_t len; 1115 struct mbuf *mreq, *mrep, *md, *mb; 1116 const int v3 = NFS_ISV3(vp); 1117 struct nfsnode *np = VTONFS(vp); 1118 #ifndef NFS_V2_ONLY 1119 int attrflag; 1120 #endif 1121 1122 nfsstats.rpccnt[NFSPROC_READLINK]++; 1123 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1124 nfsm_fhtom(np, v3); 1125 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1126 #ifndef NFS_V2_ONLY 1127 if (v3) 1128 nfsm_postop_attr(vp, attrflag, 0); 1129 #endif 1130 if (!error) { 1131 #ifndef NFS_V2_ONLY 1132 if (v3) { 1133 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1134 len = fxdr_unsigned(uint32_t, *tl); 1135 if (len > NFS_MAXPATHLEN) { 1136 /* 1137 * this pathname is too long for us. 1138 */ 1139 m_freem(mrep); 1140 /* Solaris returns EINVAL. should we follow? */ 1141 error = ENAMETOOLONG; 1142 goto nfsmout; 1143 } 1144 } else 1145 #endif 1146 { 1147 nfsm_strsiz(len, NFS_MAXPATHLEN); 1148 } 1149 nfsm_mtouio(uiop, len); 1150 } 1151 nfsm_reqdone; 1152 return (error); 1153 } 1154 1155 /* 1156 * nfs read rpc call 1157 * Ditto above 1158 */ 1159 int 1160 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1161 { 1162 u_int32_t *tl; 1163 char *cp; 1164 int32_t t1, t2; 1165 char *bpos, *dpos, *cp2; 1166 struct mbuf *mreq, *mrep, *md, *mb; 1167 struct nfsmount *nmp; 1168 int error = 0, len, retlen, tsiz, eof, byte_count; 1169 const int v3 = NFS_ISV3(vp); 1170 struct nfsnode *np = VTONFS(vp); 1171 #ifndef NFS_V2_ONLY 1172 int attrflag; 1173 #endif 1174 1175 #ifndef nolint 1176 eof = 0; 1177 #endif 1178 nmp = VFSTONFS(vp->v_mount); 1179 tsiz = uiop->uio_resid; 1180 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1181 return (EFBIG); 1182 iostat_busy(nmp->nm_stats); 1183 byte_count = 0; /* count bytes actually transferred */ 1184 while (tsiz > 0) { 1185 nfsstats.rpccnt[NFSPROC_READ]++; 1186 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1187 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1188 nfsm_fhtom(np, v3); 1189 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1190 #ifndef NFS_V2_ONLY 1191 if (v3) { 1192 txdr_hyper(uiop->uio_offset, tl); 1193 *(tl + 2) = txdr_unsigned(len); 1194 } else 1195 #endif 1196 { 1197 *tl++ = txdr_unsigned(uiop->uio_offset); 1198 *tl++ = txdr_unsigned(len); 1199 *tl = 0; 1200 } 1201 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1202 #ifndef NFS_V2_ONLY 1203 if (v3) { 1204 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1205 if (error) { 1206 m_freem(mrep); 1207 goto nfsmout; 1208 } 1209 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1210 eof = fxdr_unsigned(int, *(tl + 1)); 1211 } else 1212 #endif 1213 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1214 nfsm_strsiz(retlen, nmp->nm_rsize); 1215 nfsm_mtouio(uiop, retlen); 1216 m_freem(mrep); 1217 tsiz -= retlen; 1218 byte_count += retlen; 1219 #ifndef NFS_V2_ONLY 1220 if (v3) { 1221 if (eof || retlen == 0) 1222 tsiz = 0; 1223 } else 1224 #endif 1225 if (retlen < len) 1226 tsiz = 0; 1227 } 1228 nfsmout: 1229 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1230 return (error); 1231 } 1232 1233 struct nfs_writerpc_context { 1234 kmutex_t nwc_lock; 1235 kcondvar_t nwc_cv; 1236 int nwc_mbufcount; 1237 }; 1238 1239 /* 1240 * free mbuf used to refer protected pages while write rpc call. 1241 * called at splvm. 1242 */ 1243 static void 1244 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1245 { 1246 struct nfs_writerpc_context *ctx = arg; 1247 1248 KASSERT(m != NULL); 1249 KASSERT(ctx != NULL); 1250 pool_cache_put(mb_cache, m); 1251 mutex_enter(&ctx->nwc_lock); 1252 if (--ctx->nwc_mbufcount == 0) { 1253 cv_signal(&ctx->nwc_cv); 1254 } 1255 mutex_exit(&ctx->nwc_lock); 1256 } 1257 1258 /* 1259 * nfs write call 1260 */ 1261 int 1262 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, bool pageprotected, bool *stalewriteverfp) 1263 { 1264 u_int32_t *tl; 1265 char *cp; 1266 int32_t t1, t2; 1267 char *bpos, *dpos; 1268 struct mbuf *mreq, *mrep, *md, *mb; 1269 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1270 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1271 const int v3 = NFS_ISV3(vp); 1272 int committed = NFSV3WRITE_FILESYNC; 1273 struct nfsnode *np = VTONFS(vp); 1274 struct nfs_writerpc_context ctx; 1275 int byte_count; 1276 size_t origresid; 1277 #ifndef NFS_V2_ONLY 1278 char *cp2; 1279 int rlen, commit; 1280 #endif 1281 1282 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1283 panic("writerpc readonly vp %p", vp); 1284 } 1285 1286 #ifdef DIAGNOSTIC 1287 if (uiop->uio_iovcnt != 1) 1288 panic("nfs: writerpc iovcnt > 1"); 1289 #endif 1290 tsiz = uiop->uio_resid; 1291 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1292 return EFBIG; 1293 1294 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1295 cv_init(&ctx.nwc_cv, "nfsmblk"); 1296 ctx.nwc_mbufcount = 1; 1297 1298 retry: 1299 origresid = uiop->uio_resid; 1300 KASSERT(origresid == uiop->uio_iov->iov_len); 1301 iostat_busy(nmp->nm_stats); 1302 byte_count = 0; /* count of bytes actually written */ 1303 while (tsiz > 0) { 1304 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1305 uint32_t backup; 1306 bool stalewriteverf = false; 1307 1308 nfsstats.rpccnt[NFSPROC_WRITE]++; 1309 len = min(tsiz, nmp->nm_wsize); 1310 datalen = pageprotected ? 0 : nfsm_rndup(len); 1311 nfsm_reqhead(np, NFSPROC_WRITE, 1312 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1313 nfsm_fhtom(np, v3); 1314 #ifndef NFS_V2_ONLY 1315 if (v3) { 1316 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1317 txdr_hyper(uiop->uio_offset, tl); 1318 tl += 2; 1319 *tl++ = txdr_unsigned(len); 1320 *tl++ = txdr_unsigned(*iomode); 1321 *tl = txdr_unsigned(len); 1322 } else 1323 #endif 1324 { 1325 u_int32_t x; 1326 1327 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1328 /* Set both "begin" and "current" to non-garbage. */ 1329 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1330 *tl++ = x; /* "begin offset" */ 1331 *tl++ = x; /* "current offset" */ 1332 x = txdr_unsigned(len); 1333 *tl++ = x; /* total to this offset */ 1334 *tl = x; /* size of this write */ 1335 1336 } 1337 if (pageprotected) { 1338 /* 1339 * since we know pages can't be modified during i/o, 1340 * no need to copy them for us. 1341 */ 1342 struct mbuf *m; 1343 struct iovec *iovp = uiop->uio_iov; 1344 1345 m = m_get(M_WAIT, MT_DATA); 1346 MCLAIM(m, &nfs_mowner); 1347 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1348 nfs_writerpc_extfree, &ctx); 1349 m->m_flags |= M_EXT_ROMAP; 1350 m->m_len = len; 1351 mb->m_next = m; 1352 /* 1353 * no need to maintain mb and bpos here 1354 * because no one care them later. 1355 */ 1356 #if 0 1357 mb = m; 1358 bpos = mtod(void *, mb) + mb->m_len; 1359 #endif 1360 UIO_ADVANCE(uiop, len); 1361 uiop->uio_offset += len; 1362 mutex_enter(&ctx.nwc_lock); 1363 ctx.nwc_mbufcount++; 1364 mutex_exit(&ctx.nwc_lock); 1365 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1366 } else { 1367 nfsm_uiotom(uiop, len); 1368 } 1369 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1370 #ifndef NFS_V2_ONLY 1371 if (v3) { 1372 wccflag = NFSV3_WCCCHK; 1373 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1374 if (!error) { 1375 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1376 + NFSX_V3WRITEVERF); 1377 rlen = fxdr_unsigned(int, *tl++); 1378 if (rlen == 0) { 1379 error = NFSERR_IO; 1380 m_freem(mrep); 1381 break; 1382 } else if (rlen < len) { 1383 backup = len - rlen; 1384 UIO_ADVANCE(uiop, -backup); 1385 uiop->uio_offset -= backup; 1386 len = rlen; 1387 } 1388 commit = fxdr_unsigned(int, *tl++); 1389 1390 /* 1391 * Return the lowest committment level 1392 * obtained by any of the RPCs. 1393 */ 1394 if (committed == NFSV3WRITE_FILESYNC) 1395 committed = commit; 1396 else if (committed == NFSV3WRITE_DATASYNC && 1397 commit == NFSV3WRITE_UNSTABLE) 1398 committed = commit; 1399 mutex_enter(&nmp->nm_lock); 1400 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1401 memcpy(nmp->nm_writeverf, tl, 1402 NFSX_V3WRITEVERF); 1403 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1404 } else if ((nmp->nm_iflag & 1405 NFSMNT_STALEWRITEVERF) || 1406 memcmp(tl, nmp->nm_writeverf, 1407 NFSX_V3WRITEVERF)) { 1408 memcpy(nmp->nm_writeverf, tl, 1409 NFSX_V3WRITEVERF); 1410 /* 1411 * note NFSMNT_STALEWRITEVERF 1412 * if we're the first thread to 1413 * notice it. 1414 */ 1415 if ((nmp->nm_iflag & 1416 NFSMNT_STALEWRITEVERF) == 0) { 1417 stalewriteverf = true; 1418 nmp->nm_iflag |= 1419 NFSMNT_STALEWRITEVERF; 1420 } 1421 } 1422 mutex_exit(&nmp->nm_lock); 1423 } 1424 } else 1425 #endif 1426 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1427 if (wccflag) 1428 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1429 m_freem(mrep); 1430 if (error) 1431 break; 1432 tsiz -= len; 1433 byte_count += len; 1434 if (stalewriteverf) { 1435 *stalewriteverfp = true; 1436 stalewriteverf = false; 1437 if (committed == NFSV3WRITE_UNSTABLE && 1438 len != origresid) { 1439 /* 1440 * if our write requests weren't atomic but 1441 * unstable, datas in previous iterations 1442 * might have already been lost now. 1443 * then, we should resend them to nfsd. 1444 */ 1445 backup = origresid - tsiz; 1446 UIO_ADVANCE(uiop, -backup); 1447 uiop->uio_offset -= backup; 1448 tsiz = origresid; 1449 goto retry; 1450 } 1451 } 1452 } 1453 nfsmout: 1454 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1455 if (pageprotected) { 1456 /* 1457 * wait until mbufs go away. 1458 * retransmitted mbufs can survive longer than rpc requests 1459 * themselves. 1460 */ 1461 mutex_enter(&ctx.nwc_lock); 1462 ctx.nwc_mbufcount--; 1463 while (ctx.nwc_mbufcount > 0) { 1464 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1465 } 1466 mutex_exit(&ctx.nwc_lock); 1467 } 1468 mutex_destroy(&ctx.nwc_lock); 1469 cv_destroy(&ctx.nwc_cv); 1470 *iomode = committed; 1471 if (error) 1472 uiop->uio_resid = tsiz; 1473 return (error); 1474 } 1475 1476 /* 1477 * nfs mknod rpc 1478 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1479 * mode set to specify the file type and the size field for rdev. 1480 */ 1481 int 1482 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, struct vattr *vap) 1483 { 1484 struct nfsv2_sattr *sp; 1485 u_int32_t *tl; 1486 char *cp; 1487 int32_t t1, t2; 1488 struct vnode *newvp = (struct vnode *)0; 1489 struct nfsnode *dnp, *np; 1490 char *cp2; 1491 char *bpos, *dpos; 1492 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1493 struct mbuf *mreq, *mrep, *md, *mb; 1494 u_int32_t rdev; 1495 const int v3 = NFS_ISV3(dvp); 1496 1497 if (vap->va_type == VCHR || vap->va_type == VBLK) 1498 rdev = txdr_unsigned(vap->va_rdev); 1499 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1500 rdev = nfs_xdrneg1; 1501 else { 1502 VOP_ABORTOP(dvp, cnp); 1503 vput(dvp); 1504 return (EOPNOTSUPP); 1505 } 1506 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1507 dnp = VTONFS(dvp); 1508 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1509 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1510 nfsm_fhtom(dnp, v3); 1511 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1512 #ifndef NFS_V2_ONLY 1513 if (v3) { 1514 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1515 *tl++ = vtonfsv3_type(vap->va_type); 1516 nfsm_v3attrbuild(vap, false); 1517 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1518 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1519 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1520 *tl = txdr_unsigned(minor(vap->va_rdev)); 1521 } 1522 } else 1523 #endif 1524 { 1525 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1526 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1527 sp->sa_uid = nfs_xdrneg1; 1528 sp->sa_gid = nfs_xdrneg1; 1529 sp->sa_size = rdev; 1530 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1531 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1532 } 1533 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1534 if (!error) { 1535 nfsm_mtofh(dvp, newvp, v3, gotvp); 1536 if (!gotvp) { 1537 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1538 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1539 if (!error) 1540 newvp = NFSTOV(np); 1541 } 1542 } 1543 #ifndef NFS_V2_ONLY 1544 if (v3) 1545 nfsm_wcc_data(dvp, wccflag, 0, !error); 1546 #endif 1547 nfsm_reqdone; 1548 if (error) { 1549 if (newvp) 1550 vput(newvp); 1551 } else { 1552 if (cnp->cn_flags & MAKEENTRY) 1553 nfs_cache_enter(dvp, newvp, cnp); 1554 *vpp = newvp; 1555 } 1556 VTONFS(dvp)->n_flag |= NMODIFIED; 1557 if (!wccflag) 1558 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1559 vput(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_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, 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_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, 0); 1712 *ap->a_vpp = newvp; 1713 } else { 1714 if (newvp) 1715 vput(newvp); 1716 if (error == EEXIST) 1717 cache_purge1(dvp, cnp, 0); 1718 } 1719 VTONFS(dvp)->n_flag |= NMODIFIED; 1720 if (!wccflag) 1721 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1722 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1723 vput(dvp); 1724 return (error); 1725 } 1726 1727 /* 1728 * nfs file remove call 1729 * To try and make nfs semantics closer to ufs semantics, a file that has 1730 * other processes using the vnode is renamed instead of removed and then 1731 * removed later on the last close. 1732 * - If v_usecount > 1 1733 * If a rename is not already in the works 1734 * call nfs_sillyrename() to set it up 1735 * else 1736 * do the remove rpc 1737 */ 1738 int 1739 nfs_remove(void *v) 1740 { 1741 struct vop_remove_args /* { 1742 struct vnodeop_desc *a_desc; 1743 struct vnode * a_dvp; 1744 struct vnode * a_vp; 1745 struct componentname * a_cnp; 1746 } */ *ap = v; 1747 struct vnode *vp = ap->a_vp; 1748 struct vnode *dvp = ap->a_dvp; 1749 struct componentname *cnp = ap->a_cnp; 1750 struct nfsnode *np = VTONFS(vp); 1751 int error = 0; 1752 struct vattr vattr; 1753 1754 #ifndef DIAGNOSTIC 1755 if (vp->v_usecount < 1) 1756 panic("nfs_remove: bad v_usecount"); 1757 #endif 1758 if (vp->v_type == VDIR) 1759 error = EPERM; 1760 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1761 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1762 vattr.va_nlink > 1)) { 1763 /* 1764 * Purge the name cache so that the chance of a lookup for 1765 * the name succeeding while the remove is in progress is 1766 * minimized. Without node locking it can still happen, such 1767 * that an I/O op returns ESTALE, but since you get this if 1768 * another host removes the file.. 1769 */ 1770 cache_purge(vp); 1771 /* 1772 * throw away biocache buffers, mainly to avoid 1773 * unnecessary delayed writes later. 1774 */ 1775 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1776 /* Do the rpc */ 1777 if (error != EINTR) 1778 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1779 cnp->cn_namelen, cnp->cn_cred, curlwp); 1780 } else if (!np->n_sillyrename) 1781 error = nfs_sillyrename(dvp, vp, cnp, false); 1782 if (!error && nfs_getattrcache(vp, &vattr) == 0 && 1783 vattr.va_nlink == 1) { 1784 np->n_flag |= NREMOVED; 1785 } 1786 NFS_INVALIDATE_ATTRCACHE(np); 1787 VN_KNOTE(vp, NOTE_DELETE); 1788 VN_KNOTE(dvp, NOTE_WRITE); 1789 if (dvp == vp) 1790 vrele(vp); 1791 else 1792 vput(vp); 1793 vput(dvp); 1794 return (error); 1795 } 1796 1797 /* 1798 * nfs file remove rpc called from nfs_inactive 1799 */ 1800 int 1801 nfs_removeit(struct sillyrename *sp) 1802 { 1803 1804 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1805 (struct lwp *)0)); 1806 } 1807 1808 /* 1809 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1810 */ 1811 int 1812 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, kauth_cred_t cred, struct lwp *l) 1813 { 1814 u_int32_t *tl; 1815 char *cp; 1816 #ifndef NFS_V2_ONLY 1817 int32_t t1; 1818 char *cp2; 1819 #endif 1820 int32_t t2; 1821 char *bpos, *dpos; 1822 int error = 0, wccflag = NFSV3_WCCRATTR; 1823 struct mbuf *mreq, *mrep, *md, *mb; 1824 const int v3 = NFS_ISV3(dvp); 1825 int rexmit = 0; 1826 struct nfsnode *dnp = VTONFS(dvp); 1827 1828 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1829 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1830 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1831 nfsm_fhtom(dnp, v3); 1832 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1833 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1834 #ifndef NFS_V2_ONLY 1835 if (v3) 1836 nfsm_wcc_data(dvp, wccflag, 0, !error); 1837 #endif 1838 nfsm_reqdone; 1839 VTONFS(dvp)->n_flag |= NMODIFIED; 1840 if (!wccflag) 1841 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1842 /* 1843 * Kludge City: If the first reply to the remove rpc is lost.. 1844 * the reply to the retransmitted request will be ENOENT 1845 * since the file was in fact removed 1846 * Therefore, we cheat and return success. 1847 */ 1848 if (rexmit && error == ENOENT) 1849 error = 0; 1850 return (error); 1851 } 1852 1853 /* 1854 * nfs file rename call 1855 */ 1856 int 1857 nfs_rename(void *v) 1858 { 1859 struct vop_rename_args /* { 1860 struct vnode *a_fdvp; 1861 struct vnode *a_fvp; 1862 struct componentname *a_fcnp; 1863 struct vnode *a_tdvp; 1864 struct vnode *a_tvp; 1865 struct componentname *a_tcnp; 1866 } */ *ap = v; 1867 struct vnode *fvp = ap->a_fvp; 1868 struct vnode *tvp = ap->a_tvp; 1869 struct vnode *fdvp = ap->a_fdvp; 1870 struct vnode *tdvp = ap->a_tdvp; 1871 struct componentname *tcnp = ap->a_tcnp; 1872 struct componentname *fcnp = ap->a_fcnp; 1873 int error; 1874 1875 /* Check for cross-device rename */ 1876 if ((fvp->v_mount != tdvp->v_mount) || 1877 (tvp && (fvp->v_mount != tvp->v_mount))) { 1878 error = EXDEV; 1879 goto out; 1880 } 1881 1882 /* 1883 * If the tvp exists and is in use, sillyrename it before doing the 1884 * rename of the new file over it. 1885 * 1886 * Have sillyrename use link instead of rename if possible, 1887 * so that we don't lose the file if the rename fails, and so 1888 * that there's no window when the "to" file doesn't exist. 1889 */ 1890 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1891 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1892 VN_KNOTE(tvp, NOTE_DELETE); 1893 vput(tvp); 1894 tvp = NULL; 1895 } 1896 1897 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1898 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1899 curlwp); 1900 1901 VN_KNOTE(fdvp, NOTE_WRITE); 1902 VN_KNOTE(tdvp, NOTE_WRITE); 1903 if (error == 0 || error == EEXIST) { 1904 if (fvp->v_type == VDIR) 1905 cache_purge(fvp); 1906 else 1907 cache_purge1(fdvp, fcnp, 0); 1908 if (tvp != NULL && tvp->v_type == VDIR) 1909 cache_purge(tvp); 1910 else 1911 cache_purge1(tdvp, tcnp, 0); 1912 } 1913 out: 1914 if (tdvp == tvp) 1915 vrele(tdvp); 1916 else 1917 vput(tdvp); 1918 if (tvp) 1919 vput(tvp); 1920 vrele(fdvp); 1921 vrele(fvp); 1922 return (error); 1923 } 1924 1925 /* 1926 * nfs file rename rpc called from nfs_remove() above 1927 */ 1928 int 1929 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, struct sillyrename *sp) 1930 { 1931 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1932 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 1933 } 1934 1935 /* 1936 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1937 */ 1938 int 1939 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) 1940 { 1941 u_int32_t *tl; 1942 char *cp; 1943 #ifndef NFS_V2_ONLY 1944 int32_t t1; 1945 char *cp2; 1946 #endif 1947 int32_t t2; 1948 char *bpos, *dpos; 1949 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1950 struct mbuf *mreq, *mrep, *md, *mb; 1951 const int v3 = NFS_ISV3(fdvp); 1952 int rexmit = 0; 1953 struct nfsnode *fdnp = VTONFS(fdvp); 1954 1955 nfsstats.rpccnt[NFSPROC_RENAME]++; 1956 nfsm_reqhead(fdnp, NFSPROC_RENAME, 1957 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1958 nfsm_rndup(tnamelen)); 1959 nfsm_fhtom(fdnp, v3); 1960 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1961 nfsm_fhtom(VTONFS(tdvp), v3); 1962 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1963 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 1964 #ifndef NFS_V2_ONLY 1965 if (v3) { 1966 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 1967 nfsm_wcc_data(tdvp, twccflag, 0, !error); 1968 } 1969 #endif 1970 nfsm_reqdone; 1971 VTONFS(fdvp)->n_flag |= NMODIFIED; 1972 VTONFS(tdvp)->n_flag |= NMODIFIED; 1973 if (!fwccflag) 1974 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 1975 if (!twccflag) 1976 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 1977 /* 1978 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1979 */ 1980 if (rexmit && error == ENOENT) 1981 error = 0; 1982 return (error); 1983 } 1984 1985 /* 1986 * NFS link RPC, called from nfs_link. 1987 * Assumes dvp and vp locked, and leaves them that way. 1988 */ 1989 1990 static int 1991 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 1992 size_t namelen, kauth_cred_t cred, struct lwp *l) 1993 { 1994 u_int32_t *tl; 1995 char *cp; 1996 #ifndef NFS_V2_ONLY 1997 int32_t t1; 1998 char *cp2; 1999 #endif 2000 int32_t t2; 2001 char *bpos, *dpos; 2002 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2003 struct mbuf *mreq, *mrep, *md, *mb; 2004 const int v3 = NFS_ISV3(dvp); 2005 int rexmit = 0; 2006 struct nfsnode *np = VTONFS(vp); 2007 2008 nfsstats.rpccnt[NFSPROC_LINK]++; 2009 nfsm_reqhead(np, NFSPROC_LINK, 2010 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 2011 nfsm_fhtom(np, v3); 2012 nfsm_fhtom(VTONFS(dvp), v3); 2013 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 2014 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 2015 #ifndef NFS_V2_ONLY 2016 if (v3) { 2017 nfsm_postop_attr(vp, attrflag, 0); 2018 nfsm_wcc_data(dvp, wccflag, 0, !error); 2019 } 2020 #endif 2021 nfsm_reqdone; 2022 2023 VTONFS(dvp)->n_flag |= NMODIFIED; 2024 if (!attrflag) 2025 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 2026 if (!wccflag) 2027 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2028 2029 /* 2030 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2031 */ 2032 if (rexmit && error == EEXIST) 2033 error = 0; 2034 2035 return error; 2036 } 2037 2038 /* 2039 * nfs hard link create call 2040 */ 2041 int 2042 nfs_link(void *v) 2043 { 2044 struct vop_link_args /* { 2045 struct vnode *a_dvp; 2046 struct vnode *a_vp; 2047 struct componentname *a_cnp; 2048 } */ *ap = v; 2049 struct vnode *vp = ap->a_vp; 2050 struct vnode *dvp = ap->a_dvp; 2051 struct componentname *cnp = ap->a_cnp; 2052 int error = 0; 2053 2054 error = vn_lock(vp, LK_EXCLUSIVE); 2055 if (error != 0) { 2056 VOP_ABORTOP(dvp, cnp); 2057 vput(dvp); 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, 0); 2073 } 2074 VOP_UNLOCK(vp); 2075 VN_KNOTE(vp, NOTE_LINK); 2076 VN_KNOTE(dvp, NOTE_WRITE); 2077 vput(dvp); 2078 return (error); 2079 } 2080 2081 /* 2082 * nfs symbolic link create call 2083 */ 2084 int 2085 nfs_symlink(void *v) 2086 { 2087 struct vop_symlink_args /* { 2088 struct vnode *a_dvp; 2089 struct vnode **a_vpp; 2090 struct componentname *a_cnp; 2091 struct vattr *a_vap; 2092 char *a_target; 2093 } */ *ap = v; 2094 struct vnode *dvp = ap->a_dvp; 2095 struct vattr *vap = ap->a_vap; 2096 struct componentname *cnp = ap->a_cnp; 2097 struct nfsv2_sattr *sp; 2098 u_int32_t *tl; 2099 char *cp; 2100 int32_t t1, t2; 2101 char *bpos, *dpos, *cp2; 2102 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2103 struct mbuf *mreq, *mrep, *md, *mb; 2104 struct vnode *newvp = (struct vnode *)0; 2105 const int v3 = NFS_ISV3(dvp); 2106 int rexmit = 0; 2107 struct nfsnode *dnp = VTONFS(dvp); 2108 2109 *ap->a_vpp = NULL; 2110 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2111 slen = strlen(ap->a_target); 2112 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2113 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2114 nfsm_fhtom(dnp, v3); 2115 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2116 #ifndef NFS_V2_ONlY 2117 if (v3) 2118 nfsm_v3attrbuild(vap, false); 2119 #endif 2120 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2121 #ifndef NFS_V2_ONlY 2122 if (!v3) { 2123 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2124 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2125 sp->sa_uid = nfs_xdrneg1; 2126 sp->sa_gid = nfs_xdrneg1; 2127 sp->sa_size = nfs_xdrneg1; 2128 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2129 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2130 } 2131 #endif 2132 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2133 &rexmit); 2134 #ifndef NFS_V2_ONlY 2135 if (v3) { 2136 if (!error) 2137 nfsm_mtofh(dvp, newvp, v3, gotvp); 2138 nfsm_wcc_data(dvp, wccflag, 0, !error); 2139 } 2140 #endif 2141 nfsm_reqdone; 2142 /* 2143 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2144 */ 2145 if (rexmit && error == EEXIST) 2146 error = 0; 2147 if (error == 0 || error == EEXIST) 2148 cache_purge1(dvp, cnp, 0); 2149 if (error == 0 && newvp == NULL) { 2150 struct nfsnode *np = NULL; 2151 2152 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2153 cnp->cn_cred, curlwp, &np); 2154 if (error == 0) 2155 newvp = NFSTOV(np); 2156 } 2157 if (error) { 2158 if (newvp != NULL) 2159 vput(newvp); 2160 } else { 2161 *ap->a_vpp = newvp; 2162 } 2163 VTONFS(dvp)->n_flag |= NMODIFIED; 2164 if (!wccflag) 2165 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2166 VN_KNOTE(dvp, NOTE_WRITE); 2167 vput(dvp); 2168 return (error); 2169 } 2170 2171 /* 2172 * nfs make dir call 2173 */ 2174 int 2175 nfs_mkdir(void *v) 2176 { 2177 struct vop_mkdir_args /* { 2178 struct vnode *a_dvp; 2179 struct vnode **a_vpp; 2180 struct componentname *a_cnp; 2181 struct vattr *a_vap; 2182 } */ *ap = v; 2183 struct vnode *dvp = ap->a_dvp; 2184 struct vattr *vap = ap->a_vap; 2185 struct componentname *cnp = ap->a_cnp; 2186 struct nfsv2_sattr *sp; 2187 u_int32_t *tl; 2188 char *cp; 2189 int32_t t1, t2; 2190 int len; 2191 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2192 struct vnode *newvp = (struct vnode *)0; 2193 char *bpos, *dpos, *cp2; 2194 int error = 0, wccflag = NFSV3_WCCRATTR; 2195 int gotvp = 0; 2196 int rexmit = 0; 2197 struct mbuf *mreq, *mrep, *md, *mb; 2198 const int v3 = NFS_ISV3(dvp); 2199 2200 len = cnp->cn_namelen; 2201 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2202 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2203 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2204 nfsm_fhtom(dnp, v3); 2205 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2206 #ifndef NFS_V2_ONLY 2207 if (v3) { 2208 nfsm_v3attrbuild(vap, false); 2209 } else 2210 #endif 2211 { 2212 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2213 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2214 sp->sa_uid = nfs_xdrneg1; 2215 sp->sa_gid = nfs_xdrneg1; 2216 sp->sa_size = nfs_xdrneg1; 2217 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2218 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2219 } 2220 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2221 if (!error) 2222 nfsm_mtofh(dvp, newvp, v3, gotvp); 2223 if (v3) 2224 nfsm_wcc_data(dvp, wccflag, 0, !error); 2225 nfsm_reqdone; 2226 VTONFS(dvp)->n_flag |= NMODIFIED; 2227 if (!wccflag) 2228 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2229 /* 2230 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2231 * if we can succeed in looking up the directory. 2232 */ 2233 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2234 if (newvp) { 2235 vput(newvp); 2236 newvp = (struct vnode *)0; 2237 } 2238 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2239 curlwp, &np); 2240 if (!error) { 2241 newvp = NFSTOV(np); 2242 if (newvp->v_type != VDIR || newvp == dvp) 2243 error = EEXIST; 2244 } 2245 } 2246 if (error) { 2247 if (newvp) { 2248 if (dvp != newvp) 2249 vput(newvp); 2250 else 2251 vrele(newvp); 2252 } 2253 } else { 2254 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2255 if (cnp->cn_flags & MAKEENTRY) 2256 nfs_cache_enter(dvp, newvp, cnp); 2257 *ap->a_vpp = newvp; 2258 } 2259 vput(dvp); 2260 return (error); 2261 } 2262 2263 /* 2264 * nfs remove directory call 2265 */ 2266 int 2267 nfs_rmdir(void *v) 2268 { 2269 struct vop_rmdir_args /* { 2270 struct vnode *a_dvp; 2271 struct vnode *a_vp; 2272 struct componentname *a_cnp; 2273 } */ *ap = v; 2274 struct vnode *vp = ap->a_vp; 2275 struct vnode *dvp = ap->a_dvp; 2276 struct componentname *cnp = ap->a_cnp; 2277 u_int32_t *tl; 2278 char *cp; 2279 #ifndef NFS_V2_ONLY 2280 int32_t t1; 2281 char *cp2; 2282 #endif 2283 int32_t t2; 2284 char *bpos, *dpos; 2285 int error = 0, wccflag = NFSV3_WCCRATTR; 2286 int rexmit = 0; 2287 struct mbuf *mreq, *mrep, *md, *mb; 2288 const int v3 = NFS_ISV3(dvp); 2289 struct nfsnode *dnp; 2290 2291 if (dvp == vp) { 2292 vrele(dvp); 2293 vput(dvp); 2294 return (EINVAL); 2295 } 2296 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2297 dnp = VTONFS(dvp); 2298 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2299 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2300 nfsm_fhtom(dnp, v3); 2301 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2302 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2303 #ifndef NFS_V2_ONLY 2304 if (v3) 2305 nfsm_wcc_data(dvp, wccflag, 0, !error); 2306 #endif 2307 nfsm_reqdone; 2308 VTONFS(dvp)->n_flag |= NMODIFIED; 2309 if (!wccflag) 2310 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2311 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2312 VN_KNOTE(vp, NOTE_DELETE); 2313 cache_purge(vp); 2314 vput(vp); 2315 vput(dvp); 2316 /* 2317 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2318 */ 2319 if (rexmit && error == ENOENT) 2320 error = 0; 2321 return (error); 2322 } 2323 2324 /* 2325 * nfs readdir call 2326 */ 2327 int 2328 nfs_readdir(void *v) 2329 { 2330 struct vop_readdir_args /* { 2331 struct vnode *a_vp; 2332 struct uio *a_uio; 2333 kauth_cred_t a_cred; 2334 int *a_eofflag; 2335 off_t **a_cookies; 2336 int *a_ncookies; 2337 } */ *ap = v; 2338 struct vnode *vp = ap->a_vp; 2339 struct uio *uio = ap->a_uio; 2340 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2341 char *base = uio->uio_iov->iov_base; 2342 int tresid, error; 2343 size_t count, lost; 2344 struct dirent *dp; 2345 off_t *cookies = NULL; 2346 int ncookies = 0, nc; 2347 2348 if (vp->v_type != VDIR) 2349 return (EPERM); 2350 2351 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2352 count = uio->uio_resid - lost; 2353 if (count <= 0) 2354 return (EINVAL); 2355 2356 /* 2357 * Call nfs_bioread() to do the real work. 2358 */ 2359 tresid = uio->uio_resid = count; 2360 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2361 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2362 2363 if (!error && ap->a_cookies) { 2364 ncookies = count / 16; 2365 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2366 *ap->a_cookies = cookies; 2367 } 2368 2369 if (!error && uio->uio_resid == tresid) { 2370 uio->uio_resid += lost; 2371 nfsstats.direofcache_misses++; 2372 if (ap->a_cookies) 2373 *ap->a_ncookies = 0; 2374 *ap->a_eofflag = 1; 2375 return (0); 2376 } 2377 2378 if (!error && ap->a_cookies) { 2379 /* 2380 * Only the NFS server and emulations use cookies, and they 2381 * load the directory block into system space, so we can 2382 * just look at it directly. 2383 */ 2384 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2385 uio->uio_iovcnt != 1) 2386 panic("nfs_readdir: lost in space"); 2387 for (nc = 0; ncookies-- && 2388 base < (char *)uio->uio_iov->iov_base; nc++){ 2389 dp = (struct dirent *) base; 2390 if (dp->d_reclen == 0) 2391 break; 2392 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2393 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2394 else 2395 *(cookies++) = NFS_GETCOOKIE(dp); 2396 base += dp->d_reclen; 2397 } 2398 uio->uio_resid += 2399 ((char *)uio->uio_iov->iov_base - base); 2400 uio->uio_iov->iov_len += 2401 ((char *)uio->uio_iov->iov_base - base); 2402 uio->uio_iov->iov_base = base; 2403 *ap->a_ncookies = nc; 2404 } 2405 2406 uio->uio_resid += lost; 2407 *ap->a_eofflag = 0; 2408 return (error); 2409 } 2410 2411 /* 2412 * Readdir rpc call. 2413 * Called from below the buffer cache by nfs_doio(). 2414 */ 2415 int 2416 nfs_readdirrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2417 { 2418 int len, left; 2419 struct dirent *dp = NULL; 2420 u_int32_t *tl; 2421 char *cp; 2422 int32_t t1, t2; 2423 char *bpos, *dpos, *cp2; 2424 struct mbuf *mreq, *mrep, *md, *mb; 2425 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2426 struct nfsnode *dnp = VTONFS(vp); 2427 u_quad_t fileno; 2428 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2429 #ifndef NFS_V2_ONLY 2430 int attrflag; 2431 #endif 2432 int nrpcs = 0, reclen; 2433 const int v3 = NFS_ISV3(vp); 2434 2435 #ifdef DIAGNOSTIC 2436 /* 2437 * Should be called from buffer cache, so only amount of 2438 * NFS_DIRBLKSIZ will be requested. 2439 */ 2440 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2441 panic("nfs readdirrpc bad uio"); 2442 #endif 2443 2444 /* 2445 * Loop around doing readdir rpc's of size nm_readdirsize 2446 * truncated to a multiple of NFS_DIRFRAGSIZ. 2447 * The stopping criteria is EOF or buffer full. 2448 */ 2449 while (more_dirs && bigenough) { 2450 /* 2451 * Heuristic: don't bother to do another RPC to further 2452 * fill up this block if there is not much room left. (< 50% 2453 * of the readdir RPC size). This wastes some buffer space 2454 * but can save up to 50% in RPC calls. 2455 */ 2456 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2457 bigenough = 0; 2458 break; 2459 } 2460 nfsstats.rpccnt[NFSPROC_READDIR]++; 2461 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2462 NFSX_READDIR(v3)); 2463 nfsm_fhtom(dnp, v3); 2464 #ifndef NFS_V2_ONLY 2465 if (v3) { 2466 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2467 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2468 txdr_swapcookie3(uiop->uio_offset, tl); 2469 } else { 2470 txdr_cookie3(uiop->uio_offset, tl); 2471 } 2472 tl += 2; 2473 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2474 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2475 } else 2476 #endif 2477 { 2478 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2479 *tl++ = txdr_unsigned(uiop->uio_offset); 2480 } 2481 *tl = txdr_unsigned(nmp->nm_readdirsize); 2482 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2483 nrpcs++; 2484 #ifndef NFS_V2_ONLY 2485 if (v3) { 2486 nfsm_postop_attr(vp, attrflag, 0); 2487 if (!error) { 2488 nfsm_dissect(tl, u_int32_t *, 2489 2 * NFSX_UNSIGNED); 2490 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2491 dnp->n_cookieverf.nfsuquad[1] = *tl; 2492 } else { 2493 m_freem(mrep); 2494 goto nfsmout; 2495 } 2496 } 2497 #endif 2498 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2499 more_dirs = fxdr_unsigned(int, *tl); 2500 2501 /* loop thru the dir entries, doctoring them to 4bsd form */ 2502 while (more_dirs && bigenough) { 2503 #ifndef NFS_V2_ONLY 2504 if (v3) { 2505 nfsm_dissect(tl, u_int32_t *, 2506 3 * NFSX_UNSIGNED); 2507 fileno = fxdr_hyper(tl); 2508 len = fxdr_unsigned(int, *(tl + 2)); 2509 } else 2510 #endif 2511 { 2512 nfsm_dissect(tl, u_int32_t *, 2513 2 * NFSX_UNSIGNED); 2514 fileno = fxdr_unsigned(u_quad_t, *tl++); 2515 len = fxdr_unsigned(int, *tl); 2516 } 2517 if (len <= 0 || len > NFS_MAXNAMLEN) { 2518 error = EBADRPC; 2519 m_freem(mrep); 2520 goto nfsmout; 2521 } 2522 /* for cookie stashing */ 2523 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2524 left = NFS_DIRFRAGSIZ - blksiz; 2525 if (reclen > left) { 2526 memset(uiop->uio_iov->iov_base, 0, left); 2527 dp->d_reclen += left; 2528 UIO_ADVANCE(uiop, left); 2529 blksiz = 0; 2530 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2531 } 2532 if (reclen > uiop->uio_resid) 2533 bigenough = 0; 2534 if (bigenough) { 2535 int tlen; 2536 2537 dp = (struct dirent *)uiop->uio_iov->iov_base; 2538 dp->d_fileno = fileno; 2539 dp->d_namlen = len; 2540 dp->d_reclen = reclen; 2541 dp->d_type = DT_UNKNOWN; 2542 blksiz += reclen; 2543 if (blksiz == NFS_DIRFRAGSIZ) 2544 blksiz = 0; 2545 UIO_ADVANCE(uiop, DIRHDSIZ); 2546 nfsm_mtouio(uiop, len); 2547 tlen = reclen - (DIRHDSIZ + len); 2548 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2549 UIO_ADVANCE(uiop, tlen); 2550 } else 2551 nfsm_adv(nfsm_rndup(len)); 2552 #ifndef NFS_V2_ONLY 2553 if (v3) { 2554 nfsm_dissect(tl, u_int32_t *, 2555 3 * NFSX_UNSIGNED); 2556 } else 2557 #endif 2558 { 2559 nfsm_dissect(tl, u_int32_t *, 2560 2 * NFSX_UNSIGNED); 2561 } 2562 if (bigenough) { 2563 #ifndef NFS_V2_ONLY 2564 if (v3) { 2565 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2566 uiop->uio_offset = 2567 fxdr_swapcookie3(tl); 2568 else 2569 uiop->uio_offset = 2570 fxdr_cookie3(tl); 2571 } 2572 else 2573 #endif 2574 { 2575 uiop->uio_offset = 2576 fxdr_unsigned(off_t, *tl); 2577 } 2578 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2579 } 2580 if (v3) 2581 tl += 2; 2582 else 2583 tl++; 2584 more_dirs = fxdr_unsigned(int, *tl); 2585 } 2586 /* 2587 * If at end of rpc data, get the eof boolean 2588 */ 2589 if (!more_dirs) { 2590 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2591 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2592 2593 /* 2594 * kludge: if we got no entries, treat it as EOF. 2595 * some server sometimes send a reply without any 2596 * entries or EOF. 2597 * although it might mean the server has very long name, 2598 * we can't handle such entries anyway. 2599 */ 2600 2601 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2602 more_dirs = 0; 2603 } 2604 m_freem(mrep); 2605 } 2606 /* 2607 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2608 * by increasing d_reclen for the last record. 2609 */ 2610 if (blksiz > 0) { 2611 left = NFS_DIRFRAGSIZ - blksiz; 2612 memset(uiop->uio_iov->iov_base, 0, left); 2613 dp->d_reclen += left; 2614 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2615 UIO_ADVANCE(uiop, left); 2616 } 2617 2618 /* 2619 * We are now either at the end of the directory or have filled the 2620 * block. 2621 */ 2622 if (bigenough) { 2623 dnp->n_direofoffset = uiop->uio_offset; 2624 dnp->n_flag |= NEOFVALID; 2625 } 2626 nfsmout: 2627 return (error); 2628 } 2629 2630 #ifndef NFS_V2_ONLY 2631 /* 2632 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2633 */ 2634 int 2635 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, kauth_cred_t cred) 2636 { 2637 int len, left; 2638 struct dirent *dp = NULL; 2639 u_int32_t *tl; 2640 char *cp; 2641 int32_t t1, t2; 2642 struct vnode *newvp; 2643 char *bpos, *dpos, *cp2; 2644 struct mbuf *mreq, *mrep, *md, *mb; 2645 struct nameidata nami, *ndp = &nami; 2646 struct componentname *cnp = &ndp->ni_cnd; 2647 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2648 struct nfsnode *dnp = VTONFS(vp), *np; 2649 nfsfh_t *fhp; 2650 u_quad_t fileno; 2651 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2652 int attrflag, fhsize, nrpcs = 0, reclen; 2653 struct nfs_fattr fattr, *fp; 2654 2655 #ifdef DIAGNOSTIC 2656 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2657 panic("nfs readdirplusrpc bad uio"); 2658 #endif 2659 ndp->ni_dvp = vp; 2660 newvp = NULLVP; 2661 2662 /* 2663 * Loop around doing readdir rpc's of size nm_readdirsize 2664 * truncated to a multiple of NFS_DIRFRAGSIZ. 2665 * The stopping criteria is EOF or buffer full. 2666 */ 2667 while (more_dirs && bigenough) { 2668 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2669 bigenough = 0; 2670 break; 2671 } 2672 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2673 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2674 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2675 nfsm_fhtom(dnp, 1); 2676 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2677 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2678 txdr_swapcookie3(uiop->uio_offset, tl); 2679 } else { 2680 txdr_cookie3(uiop->uio_offset, tl); 2681 } 2682 tl += 2; 2683 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2684 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2685 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2686 *tl = txdr_unsigned(nmp->nm_rsize); 2687 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2688 nfsm_postop_attr(vp, attrflag, 0); 2689 if (error) { 2690 m_freem(mrep); 2691 goto nfsmout; 2692 } 2693 nrpcs++; 2694 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2695 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2696 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2697 more_dirs = fxdr_unsigned(int, *tl); 2698 2699 /* loop thru the dir entries, doctoring them to 4bsd form */ 2700 while (more_dirs && bigenough) { 2701 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2702 fileno = fxdr_hyper(tl); 2703 len = fxdr_unsigned(int, *(tl + 2)); 2704 if (len <= 0 || len > NFS_MAXNAMLEN) { 2705 error = EBADRPC; 2706 m_freem(mrep); 2707 goto nfsmout; 2708 } 2709 /* for cookie stashing */ 2710 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2711 left = NFS_DIRFRAGSIZ - blksiz; 2712 if (reclen > left) { 2713 /* 2714 * DIRFRAGSIZ is aligned, no need to align 2715 * again here. 2716 */ 2717 memset(uiop->uio_iov->iov_base, 0, left); 2718 dp->d_reclen += left; 2719 UIO_ADVANCE(uiop, left); 2720 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2721 blksiz = 0; 2722 } 2723 if (reclen > uiop->uio_resid) 2724 bigenough = 0; 2725 if (bigenough) { 2726 int tlen; 2727 2728 dp = (struct dirent *)uiop->uio_iov->iov_base; 2729 dp->d_fileno = fileno; 2730 dp->d_namlen = len; 2731 dp->d_reclen = reclen; 2732 dp->d_type = DT_UNKNOWN; 2733 blksiz += reclen; 2734 if (blksiz == NFS_DIRFRAGSIZ) 2735 blksiz = 0; 2736 UIO_ADVANCE(uiop, DIRHDSIZ); 2737 nfsm_mtouio(uiop, len); 2738 tlen = reclen - (DIRHDSIZ + len); 2739 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2740 UIO_ADVANCE(uiop, tlen); 2741 cnp->cn_nameptr = dp->d_name; 2742 cnp->cn_namelen = dp->d_namlen; 2743 } else 2744 nfsm_adv(nfsm_rndup(len)); 2745 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2746 if (bigenough) { 2747 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2748 uiop->uio_offset = 2749 fxdr_swapcookie3(tl); 2750 else 2751 uiop->uio_offset = 2752 fxdr_cookie3(tl); 2753 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2754 } 2755 tl += 2; 2756 2757 /* 2758 * Since the attributes are before the file handle 2759 * (sigh), we must skip over the attributes and then 2760 * come back and get them. 2761 */ 2762 attrflag = fxdr_unsigned(int, *tl); 2763 if (attrflag) { 2764 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2765 memcpy(&fattr, fp, NFSX_V3FATTR); 2766 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2767 doit = fxdr_unsigned(int, *tl); 2768 if (doit) { 2769 nfsm_getfh(fhp, fhsize, 1); 2770 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2771 vref(vp); 2772 newvp = vp; 2773 np = dnp; 2774 } else { 2775 error = nfs_nget1(vp->v_mount, fhp, 2776 fhsize, &np, LK_NOWAIT); 2777 if (!error) 2778 newvp = NFSTOV(np); 2779 } 2780 if (!error) { 2781 const char *xcp; 2782 2783 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2784 if (bigenough) { 2785 dp->d_type = 2786 IFTODT(VTTOIF(np->n_vattr->va_type)); 2787 if (cnp->cn_namelen <= NCHNAMLEN) { 2788 ndp->ni_vp = newvp; 2789 xcp = cnp->cn_nameptr + 2790 cnp->cn_namelen; 2791 cnp->cn_hash = 2792 namei_hash(cnp->cn_nameptr, &xcp); 2793 nfs_cache_enter(ndp->ni_dvp, 2794 ndp->ni_vp, cnp); 2795 } 2796 } 2797 } 2798 error = 0; 2799 } 2800 } else { 2801 /* Just skip over the file handle */ 2802 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2803 i = fxdr_unsigned(int, *tl); 2804 nfsm_adv(nfsm_rndup(i)); 2805 } 2806 if (newvp != NULLVP) { 2807 if (newvp == vp) 2808 vrele(newvp); 2809 else 2810 vput(newvp); 2811 newvp = NULLVP; 2812 } 2813 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2814 more_dirs = fxdr_unsigned(int, *tl); 2815 } 2816 /* 2817 * If at end of rpc data, get the eof boolean 2818 */ 2819 if (!more_dirs) { 2820 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2821 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2822 2823 /* 2824 * kludge: see a comment in nfs_readdirrpc. 2825 */ 2826 2827 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2828 more_dirs = 0; 2829 } 2830 m_freem(mrep); 2831 } 2832 /* 2833 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2834 * by increasing d_reclen for the last record. 2835 */ 2836 if (blksiz > 0) { 2837 left = NFS_DIRFRAGSIZ - blksiz; 2838 memset(uiop->uio_iov->iov_base, 0, left); 2839 dp->d_reclen += left; 2840 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2841 UIO_ADVANCE(uiop, left); 2842 } 2843 2844 /* 2845 * We are now either at the end of the directory or have filled the 2846 * block. 2847 */ 2848 if (bigenough) { 2849 dnp->n_direofoffset = uiop->uio_offset; 2850 dnp->n_flag |= NEOFVALID; 2851 } 2852 nfsmout: 2853 if (newvp != NULLVP) { 2854 if(newvp == vp) 2855 vrele(newvp); 2856 else 2857 vput(newvp); 2858 } 2859 return (error); 2860 } 2861 #endif 2862 2863 /* 2864 * Silly rename. To make the NFS filesystem that is stateless look a little 2865 * more like the "ufs" a remove of an active vnode is translated to a rename 2866 * to a funny looking filename that is removed by nfs_inactive on the 2867 * nfsnode. There is the potential for another process on a different client 2868 * to create the same funny name between the nfs_lookitup() fails and the 2869 * nfs_rename() completes, but... 2870 */ 2871 int 2872 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp, bool dolink) 2873 { 2874 struct sillyrename *sp; 2875 struct nfsnode *np; 2876 int error; 2877 pid_t pid; 2878 2879 cache_purge(dvp); 2880 np = VTONFS(vp); 2881 #ifndef DIAGNOSTIC 2882 if (vp->v_type == VDIR) 2883 panic("nfs: sillyrename dir"); 2884 #endif 2885 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2886 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2887 sp->s_dvp = dvp; 2888 vref(dvp); 2889 2890 /* Fudge together a funny name */ 2891 pid = curlwp->l_proc->p_pid; 2892 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 2893 sp->s_namlen = 12; 2894 sp->s_name[8] = hexdigits[pid & 0xf]; 2895 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 2896 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 2897 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 2898 2899 /* Try lookitups until we get one that isn't there */ 2900 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2901 curlwp, (struct nfsnode **)0) == 0) { 2902 sp->s_name[4]++; 2903 if (sp->s_name[4] > 'z') { 2904 error = EINVAL; 2905 goto bad; 2906 } 2907 } 2908 if (dolink) { 2909 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 2910 sp->s_cred, curlwp); 2911 /* 2912 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 2913 */ 2914 if (error == ENOTSUP) { 2915 error = nfs_renameit(dvp, cnp, sp); 2916 } 2917 } else { 2918 error = nfs_renameit(dvp, cnp, sp); 2919 } 2920 if (error) 2921 goto bad; 2922 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2923 curlwp, &np); 2924 np->n_sillyrename = sp; 2925 return (0); 2926 bad: 2927 vrele(sp->s_dvp); 2928 kauth_cred_free(sp->s_cred); 2929 kmem_free(sp, sizeof(*sp)); 2930 return (error); 2931 } 2932 2933 /* 2934 * Look up a file name and optionally either update the file handle or 2935 * allocate an nfsnode, depending on the value of npp. 2936 * npp == NULL --> just do the lookup 2937 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2938 * handled too 2939 * *npp != NULL --> update the file handle in the vnode 2940 */ 2941 int 2942 nfs_lookitup(struct vnode *dvp, const char *name, int len, kauth_cred_t cred, struct lwp *l, struct nfsnode **npp) 2943 { 2944 u_int32_t *tl; 2945 char *cp; 2946 int32_t t1, t2; 2947 struct vnode *newvp = (struct vnode *)0; 2948 struct nfsnode *np, *dnp = VTONFS(dvp); 2949 char *bpos, *dpos, *cp2; 2950 int error = 0, fhlen; 2951 #ifndef NFS_V2_ONLY 2952 int attrflag; 2953 #endif 2954 struct mbuf *mreq, *mrep, *md, *mb; 2955 nfsfh_t *nfhp; 2956 const int v3 = NFS_ISV3(dvp); 2957 2958 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2959 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 2960 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2961 nfsm_fhtom(dnp, v3); 2962 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2963 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 2964 if (npp && !error) { 2965 nfsm_getfh(nfhp, fhlen, v3); 2966 if (*npp) { 2967 np = *npp; 2968 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2969 kmem_free(np->n_fhp, np->n_fhsize); 2970 np->n_fhp = &np->n_fh; 2971 } 2972 #if NFS_SMALLFH < NFSX_V3FHMAX 2973 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 2974 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 2975 #endif 2976 memcpy(np->n_fhp, nfhp, fhlen); 2977 np->n_fhsize = fhlen; 2978 newvp = NFSTOV(np); 2979 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2980 vref(dvp); 2981 newvp = dvp; 2982 np = dnp; 2983 } else { 2984 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2985 if (error) { 2986 m_freem(mrep); 2987 return (error); 2988 } 2989 newvp = NFSTOV(np); 2990 } 2991 #ifndef NFS_V2_ONLY 2992 if (v3) { 2993 nfsm_postop_attr(newvp, attrflag, 0); 2994 if (!attrflag && *npp == NULL) { 2995 m_freem(mrep); 2996 vput(newvp); 2997 return (ENOENT); 2998 } 2999 } else 3000 #endif 3001 nfsm_loadattr(newvp, (struct vattr *)0, 0); 3002 } 3003 nfsm_reqdone; 3004 if (npp && *npp == NULL) { 3005 if (error) { 3006 if (newvp) 3007 vput(newvp); 3008 } else 3009 *npp = np; 3010 } 3011 return (error); 3012 } 3013 3014 #ifndef NFS_V2_ONLY 3015 /* 3016 * Nfs Version 3 commit rpc 3017 */ 3018 int 3019 nfs_commit(struct vnode *vp, off_t offset, uint32_t cnt, struct lwp *l) 3020 { 3021 char *cp; 3022 u_int32_t *tl; 3023 int32_t t1, t2; 3024 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3025 char *bpos, *dpos, *cp2; 3026 int error = 0, wccflag = NFSV3_WCCRATTR; 3027 struct mbuf *mreq, *mrep, *md, *mb; 3028 struct nfsnode *np; 3029 3030 KASSERT(NFS_ISV3(vp)); 3031 3032 #ifdef NFS_DEBUG_COMMIT 3033 printf("commit %lu - %lu\n", (unsigned long)offset, 3034 (unsigned long)(offset + cnt)); 3035 #endif 3036 3037 mutex_enter(&nmp->nm_lock); 3038 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 3039 mutex_exit(&nmp->nm_lock); 3040 return (0); 3041 } 3042 mutex_exit(&nmp->nm_lock); 3043 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3044 np = VTONFS(vp); 3045 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 3046 nfsm_fhtom(np, 1); 3047 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 3048 txdr_hyper(offset, tl); 3049 tl += 2; 3050 *tl = txdr_unsigned(cnt); 3051 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3052 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3053 if (!error) { 3054 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3055 mutex_enter(&nmp->nm_lock); 3056 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3057 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3058 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3059 error = NFSERR_STALEWRITEVERF; 3060 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3061 } 3062 mutex_exit(&nmp->nm_lock); 3063 } 3064 nfsm_reqdone; 3065 return (error); 3066 } 3067 #endif 3068 3069 /* 3070 * Kludge City.. 3071 * - make nfs_bmap() essentially a no-op that does no translation 3072 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3073 * (Maybe I could use the process's page mapping, but I was concerned that 3074 * Kernel Write might not be enabled and also figured copyout() would do 3075 * a lot more work than memcpy() and also it currently happens in the 3076 * context of the swapper process (2). 3077 */ 3078 int 3079 nfs_bmap(void *v) 3080 { 3081 struct vop_bmap_args /* { 3082 struct vnode *a_vp; 3083 daddr_t a_bn; 3084 struct vnode **a_vpp; 3085 daddr_t *a_bnp; 3086 int *a_runp; 3087 } */ *ap = v; 3088 struct vnode *vp = ap->a_vp; 3089 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3090 3091 if (ap->a_vpp != NULL) 3092 *ap->a_vpp = vp; 3093 if (ap->a_bnp != NULL) 3094 *ap->a_bnp = ap->a_bn << bshift; 3095 if (ap->a_runp != NULL) 3096 *ap->a_runp = 1024 * 1024; /* XXX */ 3097 return (0); 3098 } 3099 3100 /* 3101 * Strategy routine. 3102 * For async requests when nfsiod(s) are running, queue the request by 3103 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3104 * request. 3105 */ 3106 int 3107 nfs_strategy(void *v) 3108 { 3109 struct vop_strategy_args *ap = v; 3110 struct buf *bp = ap->a_bp; 3111 int error = 0; 3112 3113 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3114 panic("nfs physio/async"); 3115 3116 /* 3117 * If the op is asynchronous and an i/o daemon is waiting 3118 * queue the request, wake it up and wait for completion 3119 * otherwise just do it ourselves. 3120 */ 3121 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3122 error = nfs_doio(bp); 3123 return (error); 3124 } 3125 3126 /* 3127 * fsync vnode op. Just call nfs_flush() with commit == 1. 3128 */ 3129 /* ARGSUSED */ 3130 int 3131 nfs_fsync(void *v) 3132 { 3133 struct vop_fsync_args /* { 3134 struct vnodeop_desc *a_desc; 3135 struct vnode * a_vp; 3136 kauth_cred_t a_cred; 3137 int a_flags; 3138 off_t offlo; 3139 off_t offhi; 3140 struct lwp * a_l; 3141 } */ *ap = v; 3142 3143 struct vnode *vp = ap->a_vp; 3144 3145 if (vp->v_type != VREG) 3146 return 0; 3147 3148 return (nfs_flush(vp, ap->a_cred, 3149 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3150 } 3151 3152 /* 3153 * Flush all the data associated with a vnode. 3154 */ 3155 int 3156 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3157 int commit) 3158 { 3159 struct nfsnode *np = VTONFS(vp); 3160 int error; 3161 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3162 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3163 3164 mutex_enter(vp->v_interlock); 3165 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3166 if (np->n_flag & NWRITEERR) { 3167 error = np->n_error; 3168 np->n_flag &= ~NWRITEERR; 3169 } 3170 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3171 return (error); 3172 } 3173 3174 /* 3175 * Return POSIX pathconf information applicable to nfs. 3176 * 3177 * N.B. The NFS V2 protocol doesn't support this RPC. 3178 */ 3179 /* ARGSUSED */ 3180 int 3181 nfs_pathconf(void *v) 3182 { 3183 struct vop_pathconf_args /* { 3184 struct vnode *a_vp; 3185 int a_name; 3186 register_t *a_retval; 3187 } */ *ap = v; 3188 struct nfsv3_pathconf *pcp; 3189 struct vnode *vp = ap->a_vp; 3190 struct mbuf *mreq, *mrep, *md, *mb; 3191 int32_t t1, t2; 3192 u_int32_t *tl; 3193 char *bpos, *dpos, *cp, *cp2; 3194 int error = 0, attrflag; 3195 #ifndef NFS_V2_ONLY 3196 struct nfsmount *nmp; 3197 unsigned int l; 3198 u_int64_t maxsize; 3199 #endif 3200 const int v3 = NFS_ISV3(vp); 3201 struct nfsnode *np = VTONFS(vp); 3202 3203 switch (ap->a_name) { 3204 /* Names that can be resolved locally. */ 3205 case _PC_PIPE_BUF: 3206 *ap->a_retval = PIPE_BUF; 3207 break; 3208 case _PC_SYNC_IO: 3209 *ap->a_retval = 1; 3210 break; 3211 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3212 case _PC_LINK_MAX: 3213 case _PC_NAME_MAX: 3214 case _PC_CHOWN_RESTRICTED: 3215 case _PC_NO_TRUNC: 3216 if (!v3) { 3217 error = EINVAL; 3218 break; 3219 } 3220 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3221 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3222 nfsm_fhtom(np, 1); 3223 nfsm_request(np, NFSPROC_PATHCONF, 3224 curlwp, curlwp->l_cred); /* XXX */ 3225 nfsm_postop_attr(vp, attrflag, 0); 3226 if (!error) { 3227 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3228 NFSX_V3PATHCONF); 3229 switch (ap->a_name) { 3230 case _PC_LINK_MAX: 3231 *ap->a_retval = 3232 fxdr_unsigned(register_t, pcp->pc_linkmax); 3233 break; 3234 case _PC_NAME_MAX: 3235 *ap->a_retval = 3236 fxdr_unsigned(register_t, pcp->pc_namemax); 3237 break; 3238 case _PC_CHOWN_RESTRICTED: 3239 *ap->a_retval = 3240 (pcp->pc_chownrestricted == nfs_true); 3241 break; 3242 case _PC_NO_TRUNC: 3243 *ap->a_retval = 3244 (pcp->pc_notrunc == nfs_true); 3245 break; 3246 } 3247 } 3248 nfsm_reqdone; 3249 break; 3250 case _PC_FILESIZEBITS: 3251 #ifndef NFS_V2_ONLY 3252 if (v3) { 3253 nmp = VFSTONFS(vp->v_mount); 3254 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3255 if ((error = nfs_fsinfo(nmp, vp, 3256 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3257 break; 3258 for (l = 0, maxsize = nmp->nm_maxfilesize; 3259 (maxsize >> l) > 0; l++) 3260 ; 3261 *ap->a_retval = l + 1; 3262 } else 3263 #endif 3264 { 3265 *ap->a_retval = 32; /* NFS V2 limitation */ 3266 } 3267 break; 3268 default: 3269 error = EINVAL; 3270 break; 3271 } 3272 3273 return (error); 3274 } 3275 3276 /* 3277 * NFS advisory byte-level locks. 3278 */ 3279 int 3280 nfs_advlock(void *v) 3281 { 3282 struct vop_advlock_args /* { 3283 struct vnode *a_vp; 3284 void *a_id; 3285 int a_op; 3286 struct flock *a_fl; 3287 int a_flags; 3288 } */ *ap = v; 3289 struct nfsnode *np = VTONFS(ap->a_vp); 3290 3291 return lf_advlock(ap, &np->n_lockf, np->n_size); 3292 } 3293 3294 /* 3295 * Print out the contents of an nfsnode. 3296 */ 3297 int 3298 nfs_print(void *v) 3299 { 3300 struct vop_print_args /* { 3301 struct vnode *a_vp; 3302 } */ *ap = v; 3303 struct vnode *vp = ap->a_vp; 3304 struct nfsnode *np = VTONFS(vp); 3305 3306 printf("tag VT_NFS, fileid %lld fsid 0x%llx", 3307 (unsigned long long)np->n_vattr->va_fileid, 3308 (unsigned long long)np->n_vattr->va_fsid); 3309 if (vp->v_type == VFIFO) 3310 VOCALL(fifo_vnodeop_p, VOFFSET(vop_print), v); 3311 printf("\n"); 3312 return (0); 3313 } 3314 3315 /* 3316 * nfs unlock wrapper. 3317 */ 3318 int 3319 nfs_unlock(void *v) 3320 { 3321 struct vop_unlock_args /* { 3322 struct vnode *a_vp; 3323 int a_flags; 3324 } */ *ap = v; 3325 struct vnode *vp = ap->a_vp; 3326 3327 /* 3328 * VOP_UNLOCK can be called by nfs_loadattrcache 3329 * with v_data == 0. 3330 */ 3331 if (VTONFS(vp)) { 3332 nfs_delayedtruncate(vp); 3333 } 3334 3335 return genfs_unlock(v); 3336 } 3337 3338 /* 3339 * nfs special file access vnode op. 3340 * Essentially just get vattr and then imitate iaccess() since the device is 3341 * local to the client. 3342 */ 3343 int 3344 nfsspec_access(void *v) 3345 { 3346 struct vop_access_args /* { 3347 struct vnode *a_vp; 3348 int a_mode; 3349 kauth_cred_t a_cred; 3350 struct lwp *a_l; 3351 } */ *ap = v; 3352 struct vattr va; 3353 struct vnode *vp = ap->a_vp; 3354 int error; 3355 3356 error = VOP_GETATTR(vp, &va, ap->a_cred); 3357 if (error) 3358 return (error); 3359 3360 /* 3361 * Disallow write attempts on filesystems mounted read-only; 3362 * unless the file is a socket, fifo, or a block or character 3363 * device resident on the filesystem. 3364 */ 3365 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3366 switch (vp->v_type) { 3367 case VREG: 3368 case VDIR: 3369 case VLNK: 3370 return (EROFS); 3371 default: 3372 break; 3373 } 3374 } 3375 3376 return (genfs_can_access(va.va_type, va.va_mode, 3377 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred)); 3378 } 3379 3380 /* 3381 * Read wrapper for special devices. 3382 */ 3383 int 3384 nfsspec_read(void *v) 3385 { 3386 struct vop_read_args /* { 3387 struct vnode *a_vp; 3388 struct uio *a_uio; 3389 int a_ioflag; 3390 kauth_cred_t a_cred; 3391 } */ *ap = v; 3392 struct nfsnode *np = VTONFS(ap->a_vp); 3393 3394 /* 3395 * Set access flag. 3396 */ 3397 np->n_flag |= NACC; 3398 getnanotime(&np->n_atim); 3399 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3400 } 3401 3402 /* 3403 * Write wrapper for special devices. 3404 */ 3405 int 3406 nfsspec_write(void *v) 3407 { 3408 struct vop_write_args /* { 3409 struct vnode *a_vp; 3410 struct uio *a_uio; 3411 int a_ioflag; 3412 kauth_cred_t a_cred; 3413 } */ *ap = v; 3414 struct nfsnode *np = VTONFS(ap->a_vp); 3415 3416 /* 3417 * Set update flag. 3418 */ 3419 np->n_flag |= NUPD; 3420 getnanotime(&np->n_mtim); 3421 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3422 } 3423 3424 /* 3425 * Close wrapper for special devices. 3426 * 3427 * Update the times on the nfsnode then do device close. 3428 */ 3429 int 3430 nfsspec_close(void *v) 3431 { 3432 struct vop_close_args /* { 3433 struct vnode *a_vp; 3434 int a_fflag; 3435 kauth_cred_t a_cred; 3436 struct lwp *a_l; 3437 } */ *ap = v; 3438 struct vnode *vp = ap->a_vp; 3439 struct nfsnode *np = VTONFS(vp); 3440 struct vattr vattr; 3441 3442 if (np->n_flag & (NACC | NUPD)) { 3443 np->n_flag |= NCHG; 3444 if (vp->v_usecount == 1 && 3445 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3446 vattr_null(&vattr); 3447 if (np->n_flag & NACC) 3448 vattr.va_atime = np->n_atim; 3449 if (np->n_flag & NUPD) 3450 vattr.va_mtime = np->n_mtim; 3451 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3452 } 3453 } 3454 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3455 } 3456 3457 /* 3458 * Read wrapper for fifos. 3459 */ 3460 int 3461 nfsfifo_read(void *v) 3462 { 3463 struct vop_read_args /* { 3464 struct vnode *a_vp; 3465 struct uio *a_uio; 3466 int a_ioflag; 3467 kauth_cred_t a_cred; 3468 } */ *ap = v; 3469 struct nfsnode *np = VTONFS(ap->a_vp); 3470 3471 /* 3472 * Set access flag. 3473 */ 3474 np->n_flag |= NACC; 3475 getnanotime(&np->n_atim); 3476 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3477 } 3478 3479 /* 3480 * Write wrapper for fifos. 3481 */ 3482 int 3483 nfsfifo_write(void *v) 3484 { 3485 struct vop_write_args /* { 3486 struct vnode *a_vp; 3487 struct uio *a_uio; 3488 int a_ioflag; 3489 kauth_cred_t a_cred; 3490 } */ *ap = v; 3491 struct nfsnode *np = VTONFS(ap->a_vp); 3492 3493 /* 3494 * Set update flag. 3495 */ 3496 np->n_flag |= NUPD; 3497 getnanotime(&np->n_mtim); 3498 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3499 } 3500 3501 /* 3502 * Close wrapper for fifos. 3503 * 3504 * Update the times on the nfsnode then do fifo close. 3505 */ 3506 int 3507 nfsfifo_close(void *v) 3508 { 3509 struct vop_close_args /* { 3510 struct vnode *a_vp; 3511 int a_fflag; 3512 kauth_cred_t a_cred; 3513 struct lwp *a_l; 3514 } */ *ap = v; 3515 struct vnode *vp = ap->a_vp; 3516 struct nfsnode *np = VTONFS(vp); 3517 struct vattr vattr; 3518 3519 if (np->n_flag & (NACC | NUPD)) { 3520 struct timespec ts; 3521 3522 getnanotime(&ts); 3523 if (np->n_flag & NACC) 3524 np->n_atim = ts; 3525 if (np->n_flag & NUPD) 3526 np->n_mtim = ts; 3527 np->n_flag |= NCHG; 3528 if (vp->v_usecount == 1 && 3529 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3530 vattr_null(&vattr); 3531 if (np->n_flag & NACC) 3532 vattr.va_atime = np->n_atim; 3533 if (np->n_flag & NUPD) 3534 vattr.va_mtime = np->n_mtim; 3535 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3536 } 3537 } 3538 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3539 } 3540