nfs_vnops.c revision 1.222.2.8
1 /* $NetBSD: nfs_vnops.c,v 1.222.2.8 2008/02/04 09:24:45 yamt 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 1.222.2.8 2008/02/04 09:24:45 yamt Exp $"); 43 44 #include "opt_inet.h" 45 #include "opt_nfs.h" 46 #include "opt_uvmhist.h" 47 48 #include <sys/param.h> 49 #include <sys/proc.h> 50 #include <sys/kernel.h> 51 #include <sys/systm.h> 52 #include <sys/resourcevar.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/condvar.h> 56 #include <sys/disk.h> 57 #include <sys/malloc.h> 58 #include <sys/kmem.h> 59 #include <sys/mbuf.h> 60 #include <sys/mutex.h> 61 #include <sys/namei.h> 62 #include <sys/vnode.h> 63 #include <sys/dirent.h> 64 #include <sys/fcntl.h> 65 #include <sys/hash.h> 66 #include <sys/lockf.h> 67 #include <sys/stat.h> 68 #include <sys/unistd.h> 69 #include <sys/kauth.h> 70 71 #include <uvm/uvm_extern.h> 72 #include <uvm/uvm.h> 73 74 #include <miscfs/fifofs/fifo.h> 75 #include <miscfs/genfs/genfs.h> 76 #include <miscfs/genfs/genfs_node.h> 77 #include <miscfs/specfs/specdev.h> 78 79 #include <nfs/rpcv2.h> 80 #include <nfs/nfsproto.h> 81 #include <nfs/nfs.h> 82 #include <nfs/nfsnode.h> 83 #include <nfs/nfsmount.h> 84 #include <nfs/xdr_subs.h> 85 #include <nfs/nfsm_subs.h> 86 #include <nfs/nfs_var.h> 87 88 #include <net/if.h> 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 92 /* 93 * Global vfs data structures for nfs 94 */ 95 int (**nfsv2_vnodeop_p) __P((void *)); 96 const struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 97 { &vop_default_desc, vn_default_error }, 98 { &vop_lookup_desc, nfs_lookup }, /* lookup */ 99 { &vop_create_desc, nfs_create }, /* create */ 100 { &vop_mknod_desc, nfs_mknod }, /* mknod */ 101 { &vop_open_desc, nfs_open }, /* open */ 102 { &vop_close_desc, nfs_close }, /* close */ 103 { &vop_access_desc, nfs_access }, /* access */ 104 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 105 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 106 { &vop_read_desc, nfs_read }, /* read */ 107 { &vop_write_desc, nfs_write }, /* write */ 108 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 109 { &vop_ioctl_desc, nfs_ioctl }, /* ioctl */ 110 { &vop_poll_desc, nfs_poll }, /* poll */ 111 { &vop_kqfilter_desc, nfs_kqfilter }, /* kqfilter */ 112 { &vop_revoke_desc, nfs_revoke }, /* revoke */ 113 { &vop_mmap_desc, nfs_mmap }, /* mmap */ 114 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 115 { &vop_seek_desc, nfs_seek }, /* seek */ 116 { &vop_remove_desc, nfs_remove }, /* remove */ 117 { &vop_link_desc, nfs_link }, /* link */ 118 { &vop_rename_desc, nfs_rename }, /* rename */ 119 { &vop_mkdir_desc, nfs_mkdir }, /* mkdir */ 120 { &vop_rmdir_desc, nfs_rmdir }, /* rmdir */ 121 { &vop_symlink_desc, nfs_symlink }, /* symlink */ 122 { &vop_readdir_desc, nfs_readdir }, /* readdir */ 123 { &vop_readlink_desc, nfs_readlink }, /* readlink */ 124 { &vop_abortop_desc, nfs_abortop }, /* abortop */ 125 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 126 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 127 { &vop_lock_desc, nfs_lock }, /* lock */ 128 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 129 { &vop_bmap_desc, nfs_bmap }, /* bmap */ 130 { &vop_strategy_desc, nfs_strategy }, /* strategy */ 131 { &vop_print_desc, nfs_print }, /* print */ 132 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 133 { &vop_pathconf_desc, nfs_pathconf }, /* pathconf */ 134 { &vop_advlock_desc, nfs_advlock }, /* advlock */ 135 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 136 { &vop_getpages_desc, nfs_getpages }, /* getpages */ 137 { &vop_putpages_desc, genfs_putpages }, /* putpages */ 138 { NULL, NULL } 139 }; 140 const struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 141 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 142 143 /* 144 * Special device vnode ops 145 */ 146 int (**spec_nfsv2nodeop_p) __P((void *)); 147 const struct vnodeopv_entry_desc spec_nfsv2nodeop_entries[] = { 148 { &vop_default_desc, vn_default_error }, 149 { &vop_lookup_desc, spec_lookup }, /* lookup */ 150 { &vop_create_desc, spec_create }, /* create */ 151 { &vop_mknod_desc, spec_mknod }, /* mknod */ 152 { &vop_open_desc, spec_open }, /* open */ 153 { &vop_close_desc, nfsspec_close }, /* close */ 154 { &vop_access_desc, nfsspec_access }, /* access */ 155 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 156 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 157 { &vop_read_desc, nfsspec_read }, /* read */ 158 { &vop_write_desc, nfsspec_write }, /* write */ 159 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 160 { &vop_ioctl_desc, spec_ioctl }, /* ioctl */ 161 { &vop_poll_desc, spec_poll }, /* poll */ 162 { &vop_kqfilter_desc, spec_kqfilter }, /* kqfilter */ 163 { &vop_revoke_desc, spec_revoke }, /* revoke */ 164 { &vop_mmap_desc, spec_mmap }, /* mmap */ 165 { &vop_fsync_desc, spec_fsync }, /* fsync */ 166 { &vop_seek_desc, spec_seek }, /* seek */ 167 { &vop_remove_desc, spec_remove }, /* remove */ 168 { &vop_link_desc, spec_link }, /* link */ 169 { &vop_rename_desc, spec_rename }, /* rename */ 170 { &vop_mkdir_desc, spec_mkdir }, /* mkdir */ 171 { &vop_rmdir_desc, spec_rmdir }, /* rmdir */ 172 { &vop_symlink_desc, spec_symlink }, /* symlink */ 173 { &vop_readdir_desc, spec_readdir }, /* readdir */ 174 { &vop_readlink_desc, spec_readlink }, /* readlink */ 175 { &vop_abortop_desc, spec_abortop }, /* abortop */ 176 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 177 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 178 { &vop_lock_desc, nfs_lock }, /* lock */ 179 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 180 { &vop_bmap_desc, spec_bmap }, /* bmap */ 181 { &vop_strategy_desc, spec_strategy }, /* strategy */ 182 { &vop_print_desc, nfs_print }, /* print */ 183 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 184 { &vop_pathconf_desc, spec_pathconf }, /* pathconf */ 185 { &vop_advlock_desc, spec_advlock }, /* advlock */ 186 { &vop_bwrite_desc, spec_bwrite }, /* bwrite */ 187 { &vop_getpages_desc, spec_getpages }, /* getpages */ 188 { &vop_putpages_desc, spec_putpages }, /* putpages */ 189 { NULL, NULL } 190 }; 191 const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 192 { &spec_nfsv2nodeop_p, spec_nfsv2nodeop_entries }; 193 194 int (**fifo_nfsv2nodeop_p) __P((void *)); 195 const struct vnodeopv_entry_desc fifo_nfsv2nodeop_entries[] = { 196 { &vop_default_desc, vn_default_error }, 197 { &vop_lookup_desc, fifo_lookup }, /* lookup */ 198 { &vop_create_desc, fifo_create }, /* create */ 199 { &vop_mknod_desc, fifo_mknod }, /* mknod */ 200 { &vop_open_desc, fifo_open }, /* open */ 201 { &vop_close_desc, nfsfifo_close }, /* close */ 202 { &vop_access_desc, nfsspec_access }, /* access */ 203 { &vop_getattr_desc, nfs_getattr }, /* getattr */ 204 { &vop_setattr_desc, nfs_setattr }, /* setattr */ 205 { &vop_read_desc, nfsfifo_read }, /* read */ 206 { &vop_write_desc, nfsfifo_write }, /* write */ 207 { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ 208 { &vop_ioctl_desc, fifo_ioctl }, /* ioctl */ 209 { &vop_poll_desc, fifo_poll }, /* poll */ 210 { &vop_kqfilter_desc, fifo_kqfilter }, /* kqfilter */ 211 { &vop_revoke_desc, fifo_revoke }, /* revoke */ 212 { &vop_mmap_desc, fifo_mmap }, /* mmap */ 213 { &vop_fsync_desc, nfs_fsync }, /* fsync */ 214 { &vop_seek_desc, fifo_seek }, /* seek */ 215 { &vop_remove_desc, fifo_remove }, /* remove */ 216 { &vop_link_desc, fifo_link }, /* link */ 217 { &vop_rename_desc, fifo_rename }, /* rename */ 218 { &vop_mkdir_desc, fifo_mkdir }, /* mkdir */ 219 { &vop_rmdir_desc, fifo_rmdir }, /* rmdir */ 220 { &vop_symlink_desc, fifo_symlink }, /* symlink */ 221 { &vop_readdir_desc, fifo_readdir }, /* readdir */ 222 { &vop_readlink_desc, fifo_readlink }, /* readlink */ 223 { &vop_abortop_desc, fifo_abortop }, /* abortop */ 224 { &vop_inactive_desc, nfs_inactive }, /* inactive */ 225 { &vop_reclaim_desc, nfs_reclaim }, /* reclaim */ 226 { &vop_lock_desc, nfs_lock }, /* lock */ 227 { &vop_unlock_desc, nfs_unlock }, /* unlock */ 228 { &vop_bmap_desc, fifo_bmap }, /* bmap */ 229 { &vop_strategy_desc, genfs_badop }, /* strategy */ 230 { &vop_print_desc, nfs_print }, /* print */ 231 { &vop_islocked_desc, nfs_islocked }, /* islocked */ 232 { &vop_pathconf_desc, fifo_pathconf }, /* pathconf */ 233 { &vop_advlock_desc, fifo_advlock }, /* advlock */ 234 { &vop_bwrite_desc, genfs_badop }, /* bwrite */ 235 { &vop_putpages_desc, fifo_putpages }, /* putpages */ 236 { NULL, NULL } 237 }; 238 const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 239 { &fifo_nfsv2nodeop_p, fifo_nfsv2nodeop_entries }; 240 241 static int nfs_linkrpc(struct vnode *, struct vnode *, const char *, 242 size_t, kauth_cred_t, struct lwp *); 243 static void nfs_writerpc_extfree(struct mbuf *, void *, size_t, void *); 244 245 /* 246 * Global variables 247 */ 248 extern u_int32_t nfs_true, nfs_false; 249 extern u_int32_t nfs_xdrneg1; 250 extern const nfstype nfsv3_type[9]; 251 252 int nfs_numasync = 0; 253 #define DIRHDSIZ _DIRENT_NAMEOFF(dp) 254 #define UIO_ADVANCE(uio, siz) \ 255 (void)((uio)->uio_resid -= (siz), \ 256 (uio)->uio_iov->iov_base = (char *)(uio)->uio_iov->iov_base + (siz), \ 257 (uio)->uio_iov->iov_len -= (siz)) 258 259 static void nfs_cache_enter(struct vnode *, struct vnode *, 260 struct componentname *); 261 262 static void 263 nfs_cache_enter(struct vnode *dvp, struct vnode *vp, 264 struct componentname *cnp) 265 { 266 struct nfsnode *dnp = VTONFS(dvp); 267 268 if (vp != NULL) { 269 struct nfsnode *np = VTONFS(vp); 270 271 np->n_ctime = np->n_vattr->va_ctime.tv_sec; 272 } 273 274 if (!timespecisset(&dnp->n_nctime)) 275 dnp->n_nctime = dnp->n_vattr->va_mtime; 276 277 cache_enter(dvp, vp, cnp); 278 } 279 280 /* 281 * nfs null call from vfs. 282 */ 283 int 284 nfs_null(vp, cred, l) 285 struct vnode *vp; 286 kauth_cred_t cred; 287 struct lwp *l; 288 { 289 char *bpos, *dpos; 290 int error = 0; 291 struct mbuf *mreq, *mrep, *md, *mb; 292 struct nfsnode *np = VTONFS(vp); 293 294 nfsm_reqhead(np, NFSPROC_NULL, 0); 295 nfsm_request(np, NFSPROC_NULL, l, cred); 296 nfsm_reqdone; 297 return (error); 298 } 299 300 /* 301 * nfs access vnode op. 302 * For nfs version 2, just return ok. File accesses may fail later. 303 * For nfs version 3, use the access rpc to check accessibility. If file modes 304 * are changed on the server, accesses might still fail later. 305 */ 306 int 307 nfs_access(v) 308 void *v; 309 { 310 struct vop_access_args /* { 311 struct vnode *a_vp; 312 int a_mode; 313 kauth_cred_t a_cred; 314 } */ *ap = v; 315 struct vnode *vp = ap->a_vp; 316 #ifndef NFS_V2_ONLY 317 u_int32_t *tl; 318 char *cp; 319 int32_t t1, t2; 320 char *bpos, *dpos, *cp2; 321 int error = 0, attrflag; 322 struct mbuf *mreq, *mrep, *md, *mb; 323 u_int32_t mode, rmode; 324 const int v3 = NFS_ISV3(vp); 325 #endif 326 int cachevalid; 327 struct nfsnode *np = VTONFS(vp); 328 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 329 330 cachevalid = (np->n_accstamp != -1 && 331 (time_uptime - np->n_accstamp) < nfs_attrtimeo(nmp, np) && 332 np->n_accuid == kauth_cred_geteuid(ap->a_cred)); 333 334 /* 335 * Check access cache first. If this request has been made for this 336 * uid shortly before, use the cached result. 337 */ 338 if (cachevalid) { 339 if (!np->n_accerror) { 340 if ((np->n_accmode & ap->a_mode) == ap->a_mode) 341 return np->n_accerror; 342 } else if ((np->n_accmode & ap->a_mode) == np->n_accmode) 343 return np->n_accerror; 344 } 345 346 #ifndef NFS_V2_ONLY 347 /* 348 * For nfs v3, do an access rpc, otherwise you are stuck emulating 349 * ufs_access() locally using the vattr. This may not be correct, 350 * since the server may apply other access criteria such as 351 * client uid-->server uid mapping that we do not know about, but 352 * this is better than just returning anything that is lying about 353 * in the cache. 354 */ 355 if (v3) { 356 nfsstats.rpccnt[NFSPROC_ACCESS]++; 357 nfsm_reqhead(np, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 358 nfsm_fhtom(np, v3); 359 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 360 if (ap->a_mode & VREAD) 361 mode = NFSV3ACCESS_READ; 362 else 363 mode = 0; 364 if (vp->v_type != VDIR) { 365 if (ap->a_mode & VWRITE) 366 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 367 if (ap->a_mode & VEXEC) 368 mode |= NFSV3ACCESS_EXECUTE; 369 } else { 370 if (ap->a_mode & VWRITE) 371 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 372 NFSV3ACCESS_DELETE); 373 if (ap->a_mode & VEXEC) 374 mode |= NFSV3ACCESS_LOOKUP; 375 } 376 *tl = txdr_unsigned(mode); 377 nfsm_request(np, NFSPROC_ACCESS, curlwp, ap->a_cred); 378 nfsm_postop_attr(vp, attrflag, 0); 379 if (!error) { 380 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 381 rmode = fxdr_unsigned(u_int32_t, *tl); 382 /* 383 * The NFS V3 spec does not clarify whether or not 384 * the returned access bits can be a superset of 385 * the ones requested, so... 386 */ 387 if ((rmode & mode) != mode) 388 error = EACCES; 389 } 390 nfsm_reqdone; 391 } else 392 #endif 393 return (nfsspec_access(ap)); 394 #ifndef NFS_V2_ONLY 395 /* 396 * Disallow write attempts on filesystems mounted read-only; 397 * unless the file is a socket, fifo, or a block or character 398 * device resident on the filesystem. 399 */ 400 if (!error && (ap->a_mode & VWRITE) && 401 (vp->v_mount->mnt_flag & MNT_RDONLY)) { 402 switch (vp->v_type) { 403 case VREG: 404 case VDIR: 405 case VLNK: 406 error = EROFS; 407 default: 408 break; 409 } 410 } 411 412 if (!error || error == EACCES) { 413 /* 414 * If we got the same result as for a previous, 415 * different request, OR it in. Don't update 416 * the timestamp in that case. 417 */ 418 if (cachevalid && np->n_accstamp != -1 && 419 error == np->n_accerror) { 420 if (!error) 421 np->n_accmode |= ap->a_mode; 422 else if ((np->n_accmode & ap->a_mode) == ap->a_mode) 423 np->n_accmode = ap->a_mode; 424 } else { 425 np->n_accstamp = time_uptime; 426 np->n_accuid = kauth_cred_geteuid(ap->a_cred); 427 np->n_accmode = ap->a_mode; 428 np->n_accerror = error; 429 } 430 } 431 432 return (error); 433 #endif 434 } 435 436 /* 437 * nfs open vnode op 438 * Check to see if the type is ok 439 * and that deletion is not in progress. 440 * For paged in text files, you will need to flush the page cache 441 * if consistency is lost. 442 */ 443 /* ARGSUSED */ 444 int 445 nfs_open(v) 446 void *v; 447 { 448 struct vop_open_args /* { 449 struct vnode *a_vp; 450 int a_mode; 451 kauth_cred_t a_cred; 452 } */ *ap = v; 453 struct vnode *vp = ap->a_vp; 454 struct nfsnode *np = VTONFS(vp); 455 int error; 456 457 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 458 return (EACCES); 459 } 460 461 if (ap->a_mode & FREAD) { 462 if (np->n_rcred != NULL) 463 kauth_cred_free(np->n_rcred); 464 np->n_rcred = ap->a_cred; 465 kauth_cred_hold(np->n_rcred); 466 } 467 if (ap->a_mode & FWRITE) { 468 if (np->n_wcred != NULL) 469 kauth_cred_free(np->n_wcred); 470 np->n_wcred = ap->a_cred; 471 kauth_cred_hold(np->n_wcred); 472 } 473 474 error = nfs_flushstalebuf(vp, ap->a_cred, curlwp, 0); 475 if (error) 476 return error; 477 478 NFS_INVALIDATE_ATTRCACHE(np); /* For Open/Close consistency */ 479 480 return (0); 481 } 482 483 /* 484 * nfs close vnode op 485 * What an NFS client should do upon close after writing is a debatable issue. 486 * Most NFS clients push delayed writes to the server upon close, basically for 487 * two reasons: 488 * 1 - So that any write errors may be reported back to the client process 489 * doing the close system call. By far the two most likely errors are 490 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 491 * 2 - To put a worst case upper bound on cache inconsistency between 492 * multiple clients for the file. 493 * There is also a consistency problem for Version 2 of the protocol w.r.t. 494 * not being able to tell if other clients are writing a file concurrently, 495 * since there is no way of knowing if the changed modify time in the reply 496 * is only due to the write for this client. 497 * (NFS Version 3 provides weak cache consistency data in the reply that 498 * should be sufficient to detect and handle this case.) 499 * 500 * The current code does the following: 501 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 502 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 503 * or commit them (this satisfies 1 and 2 except for the 504 * case where the server crashes after this close but 505 * before the commit RPC, which is felt to be "good 506 * enough". Changing the last argument to nfs_flush() to 507 * a 1 would force a commit operation, if it is felt a 508 * commit is necessary now. 509 */ 510 /* ARGSUSED */ 511 int 512 nfs_close(v) 513 void *v; 514 { 515 struct vop_close_args /* { 516 struct vnodeop_desc *a_desc; 517 struct vnode *a_vp; 518 int a_fflag; 519 kauth_cred_t a_cred; 520 } */ *ap = v; 521 struct vnode *vp = ap->a_vp; 522 struct nfsnode *np = VTONFS(vp); 523 int error = 0; 524 UVMHIST_FUNC("nfs_close"); UVMHIST_CALLED(ubchist); 525 526 if (vp->v_type == VREG) { 527 if (np->n_flag & NMODIFIED) { 528 #ifndef NFS_V2_ONLY 529 if (NFS_ISV3(vp)) { 530 error = nfs_flush(vp, ap->a_cred, MNT_WAIT, curlwp, 0); 531 np->n_flag &= ~NMODIFIED; 532 } else 533 #endif 534 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 1); 535 NFS_INVALIDATE_ATTRCACHE(np); 536 } 537 if (np->n_flag & NWRITEERR) { 538 np->n_flag &= ~NWRITEERR; 539 error = np->n_error; 540 } 541 } 542 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 543 return (error); 544 } 545 546 /* 547 * nfs getattr call from vfs. 548 */ 549 int 550 nfs_getattr(v) 551 void *v; 552 { 553 struct vop_getattr_args /* { 554 struct vnode *a_vp; 555 struct vattr *a_vap; 556 kauth_cred_t a_cred; 557 } */ *ap = v; 558 struct vnode *vp = ap->a_vp; 559 struct nfsnode *np = VTONFS(vp); 560 char *cp; 561 u_int32_t *tl; 562 int32_t t1, t2; 563 char *bpos, *dpos; 564 int error = 0; 565 struct mbuf *mreq, *mrep, *md, *mb; 566 const int v3 = NFS_ISV3(vp); 567 568 /* 569 * Update local times for special files. 570 */ 571 if (np->n_flag & (NACC | NUPD)) 572 np->n_flag |= NCHG; 573 574 /* 575 * if we have delayed truncation, do it now. 576 */ 577 nfs_delayedtruncate(vp); 578 579 /* 580 * First look in the cache. 581 */ 582 if (nfs_getattrcache(vp, ap->a_vap) == 0) 583 return (0); 584 nfsstats.rpccnt[NFSPROC_GETATTR]++; 585 nfsm_reqhead(np, NFSPROC_GETATTR, NFSX_FH(v3)); 586 nfsm_fhtom(np, v3); 587 nfsm_request(np, NFSPROC_GETATTR, curlwp, ap->a_cred); 588 if (!error) { 589 nfsm_loadattr(vp, ap->a_vap, 0); 590 if (vp->v_type == VDIR && 591 ap->a_vap->va_blocksize < NFS_DIRFRAGSIZ) 592 ap->a_vap->va_blocksize = NFS_DIRFRAGSIZ; 593 } 594 nfsm_reqdone; 595 return (error); 596 } 597 598 /* 599 * nfs setattr call. 600 */ 601 int 602 nfs_setattr(v) 603 void *v; 604 { 605 struct vop_setattr_args /* { 606 struct vnodeop_desc *a_desc; 607 struct vnode *a_vp; 608 struct vattr *a_vap; 609 kauth_cred_t a_cred; 610 } */ *ap = v; 611 struct vnode *vp = ap->a_vp; 612 struct nfsnode *np = VTONFS(vp); 613 struct vattr *vap = ap->a_vap; 614 int error = 0; 615 u_quad_t tsize = 0; 616 617 /* 618 * Setting of flags is not supported. 619 */ 620 if (vap->va_flags != VNOVAL) 621 return (EOPNOTSUPP); 622 623 /* 624 * Disallow write attempts if the filesystem is mounted read-only. 625 */ 626 if ((vap->va_uid != (uid_t)VNOVAL || 627 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 628 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 629 (vp->v_mount->mnt_flag & MNT_RDONLY)) 630 return (EROFS); 631 if (vap->va_size != VNOVAL) { 632 switch (vp->v_type) { 633 case VDIR: 634 return (EISDIR); 635 case VCHR: 636 case VBLK: 637 case VSOCK: 638 case VFIFO: 639 if (vap->va_mtime.tv_sec == VNOVAL && 640 vap->va_atime.tv_sec == VNOVAL && 641 vap->va_mode == (mode_t)VNOVAL && 642 vap->va_uid == (uid_t)VNOVAL && 643 vap->va_gid == (gid_t)VNOVAL) 644 return (0); 645 vap->va_size = VNOVAL; 646 break; 647 default: 648 /* 649 * Disallow write attempts if the filesystem is 650 * mounted read-only. 651 */ 652 if (vp->v_mount->mnt_flag & MNT_RDONLY) 653 return (EROFS); 654 genfs_node_wrlock(vp); 655 uvm_vnp_setsize(vp, vap->va_size); 656 tsize = np->n_size; 657 np->n_size = vap->va_size; 658 if (vap->va_size == 0) 659 error = nfs_vinvalbuf(vp, 0, 660 ap->a_cred, curlwp, 1); 661 else 662 error = nfs_vinvalbuf(vp, V_SAVE, 663 ap->a_cred, curlwp, 1); 664 if (error) { 665 uvm_vnp_setsize(vp, tsize); 666 genfs_node_unlock(vp); 667 return (error); 668 } 669 np->n_vattr->va_size = vap->va_size; 670 } 671 } else { 672 /* 673 * flush files before setattr because a later write of 674 * cached data might change timestamps or reset sugid bits 675 */ 676 if ((vap->va_mtime.tv_sec != VNOVAL || 677 vap->va_atime.tv_sec != VNOVAL || 678 vap->va_mode != VNOVAL) && 679 vp->v_type == VREG && 680 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_cred, 681 curlwp, 1)) == EINTR) 682 return (error); 683 } 684 error = nfs_setattrrpc(vp, vap, ap->a_cred, curlwp); 685 if (vap->va_size != VNOVAL) { 686 if (error) { 687 np->n_size = np->n_vattr->va_size = tsize; 688 uvm_vnp_setsize(vp, np->n_size); 689 } 690 genfs_node_unlock(vp); 691 } 692 VN_KNOTE(vp, NOTE_ATTRIB); 693 return (error); 694 } 695 696 /* 697 * Do an nfs setattr rpc. 698 */ 699 int 700 nfs_setattrrpc(vp, vap, cred, l) 701 struct vnode *vp; 702 struct vattr *vap; 703 kauth_cred_t cred; 704 struct lwp *l; 705 { 706 struct nfsv2_sattr *sp; 707 char *cp; 708 int32_t t1, t2; 709 char *bpos, *dpos; 710 u_int32_t *tl; 711 int error = 0; 712 struct mbuf *mreq, *mrep, *md, *mb; 713 const int v3 = NFS_ISV3(vp); 714 struct nfsnode *np = VTONFS(vp); 715 #ifndef NFS_V2_ONLY 716 int wccflag = NFSV3_WCCRATTR; 717 char *cp2; 718 #endif 719 720 nfsstats.rpccnt[NFSPROC_SETATTR]++; 721 nfsm_reqhead(np, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 722 nfsm_fhtom(np, v3); 723 #ifndef NFS_V2_ONLY 724 if (v3) { 725 nfsm_v3attrbuild(vap, true); 726 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 727 *tl = nfs_false; 728 } else { 729 #endif 730 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 731 if (vap->va_mode == (mode_t)VNOVAL) 732 sp->sa_mode = nfs_xdrneg1; 733 else 734 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 735 if (vap->va_uid == (uid_t)VNOVAL) 736 sp->sa_uid = nfs_xdrneg1; 737 else 738 sp->sa_uid = txdr_unsigned(vap->va_uid); 739 if (vap->va_gid == (gid_t)VNOVAL) 740 sp->sa_gid = nfs_xdrneg1; 741 else 742 sp->sa_gid = txdr_unsigned(vap->va_gid); 743 sp->sa_size = txdr_unsigned(vap->va_size); 744 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 745 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 746 #ifndef NFS_V2_ONLY 747 } 748 #endif 749 nfsm_request(np, NFSPROC_SETATTR, l, cred); 750 #ifndef NFS_V2_ONLY 751 if (v3) { 752 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 753 } else 754 #endif 755 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 756 nfsm_reqdone; 757 return (error); 758 } 759 760 /* 761 * nfs lookup call, one step at a time... 762 * First look in cache 763 * If not found, unlock the directory nfsnode and do the rpc 764 * 765 * This code is full of lock/unlock statements and checks, because 766 * we continue after cache_lookup has finished (we need to check 767 * with the attr cache and do an rpc if it has timed out). This means 768 * that the locking effects of cache_lookup have to be taken into 769 * account. 770 */ 771 int 772 nfs_lookup(v) 773 void *v; 774 { 775 struct vop_lookup_args /* { 776 struct vnodeop_desc *a_desc; 777 struct vnode *a_dvp; 778 struct vnode **a_vpp; 779 struct componentname *a_cnp; 780 } */ *ap = v; 781 struct componentname *cnp = ap->a_cnp; 782 struct vnode *dvp = ap->a_dvp; 783 struct vnode **vpp = ap->a_vpp; 784 int flags; 785 struct vnode *newvp; 786 u_int32_t *tl; 787 char *cp; 788 int32_t t1, t2; 789 char *bpos, *dpos, *cp2; 790 struct mbuf *mreq, *mrep, *md, *mb; 791 long len; 792 nfsfh_t *fhp; 793 struct nfsnode *np; 794 int error = 0, attrflag, fhsize; 795 const int v3 = NFS_ISV3(dvp); 796 797 flags = cnp->cn_flags; 798 799 *vpp = NULLVP; 800 newvp = NULLVP; 801 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 802 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 803 return (EROFS); 804 if (dvp->v_type != VDIR) 805 return (ENOTDIR); 806 807 /* 808 * RFC1813(nfsv3) 3.2 says clients should handle "." by themselves. 809 */ 810 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { 811 error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 812 if (error) 813 return error; 814 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) 815 return EISDIR; 816 VREF(dvp); 817 *vpp = dvp; 818 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 819 cnp->cn_flags |= SAVENAME; 820 return 0; 821 } 822 823 np = VTONFS(dvp); 824 825 /* 826 * Before tediously performing a linear scan of the directory, 827 * check the name cache to see if the directory/name pair 828 * we are looking for is known already. 829 * If the directory/name pair is found in the name cache, 830 * we have to ensure the directory has not changed from 831 * the time the cache entry has been created. If it has, 832 * the cache entry has to be ignored. 833 */ 834 error = cache_lookup_raw(dvp, vpp, cnp); 835 KASSERT(dvp != *vpp); 836 if (error >= 0) { 837 struct vattr vattr; 838 int err2; 839 840 if (error && error != ENOENT) { 841 *vpp = NULLVP; 842 return error; 843 } 844 845 err2 = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred); 846 if (err2 != 0) { 847 if (error == 0) 848 vrele(*vpp); 849 *vpp = NULLVP; 850 return err2; 851 } 852 853 if (VOP_GETATTR(dvp, &vattr, cnp->cn_cred) 854 || timespeccmp(&vattr.va_mtime, 855 &VTONFS(dvp)->n_nctime, !=)) { 856 if (error == 0) { 857 vrele(*vpp); 858 *vpp = NULLVP; 859 } 860 cache_purge1(dvp, NULL, PURGE_CHILDREN); 861 timespecclear(&np->n_nctime); 862 goto dorpc; 863 } 864 865 if (error == ENOENT) { 866 goto noentry; 867 } 868 869 newvp = *vpp; 870 if (!VOP_GETATTR(newvp, &vattr, cnp->cn_cred) 871 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 872 nfsstats.lookupcache_hits++; 873 if ((flags & ISDOTDOT) != 0) { 874 VOP_UNLOCK(dvp, 0); 875 } 876 error = vn_lock(newvp, LK_EXCLUSIVE); 877 if ((flags & ISDOTDOT) != 0) { 878 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 879 } 880 if (error) { 881 /* newvp has been revoked. */ 882 vrele(newvp); 883 *vpp = NULL; 884 return error; 885 } 886 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 887 cnp->cn_flags |= SAVENAME; 888 KASSERT(newvp->v_type != VNON); 889 return (0); 890 } 891 cache_purge1(newvp, NULL, PURGE_PARENTS); 892 vrele(newvp); 893 *vpp = NULLVP; 894 } 895 dorpc: 896 #if 0 897 /* 898 * because nfsv3 has the same CREATE semantics as ours, 899 * we don't have to perform LOOKUPs beforehand. 900 * 901 * XXX ideally we can do the same for nfsv2 in the case of !O_EXCL. 902 * XXX although we have no way to know if O_EXCL is requested or not. 903 */ 904 905 if (v3 && cnp->cn_nameiop == CREATE && 906 (flags & (ISLASTCN|ISDOTDOT)) == ISLASTCN && 907 (dvp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 908 cnp->cn_flags |= SAVENAME; 909 return (EJUSTRETURN); 910 } 911 #endif /* 0 */ 912 913 error = 0; 914 newvp = NULLVP; 915 nfsstats.lookupcache_misses++; 916 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 917 len = cnp->cn_namelen; 918 nfsm_reqhead(np, NFSPROC_LOOKUP, 919 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 920 nfsm_fhtom(np, v3); 921 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 922 nfsm_request(np, NFSPROC_LOOKUP, curlwp, cnp->cn_cred); 923 if (error) { 924 nfsm_postop_attr(dvp, attrflag, 0); 925 m_freem(mrep); 926 goto nfsmout; 927 } 928 nfsm_getfh(fhp, fhsize, v3); 929 930 /* 931 * Handle RENAME case... 932 */ 933 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { 934 if (NFS_CMPFH(np, fhp, fhsize)) { 935 m_freem(mrep); 936 return (EISDIR); 937 } 938 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 939 if (error) { 940 m_freem(mrep); 941 return error; 942 } 943 newvp = NFSTOV(np); 944 #ifndef NFS_V2_ONLY 945 if (v3) { 946 nfsm_postop_attr(newvp, attrflag, 0); 947 nfsm_postop_attr(dvp, attrflag, 0); 948 } else 949 #endif 950 nfsm_loadattr(newvp, (struct vattr *)0, 0); 951 *vpp = newvp; 952 m_freem(mrep); 953 cnp->cn_flags |= SAVENAME; 954 goto validate; 955 } 956 957 /* 958 * The postop attr handling is duplicated for each if case, 959 * because it should be done while dvp is locked (unlocking 960 * dvp is different for each case). 961 */ 962 963 if (NFS_CMPFH(np, fhp, fhsize)) { 964 /* 965 * "." lookup 966 */ 967 VREF(dvp); 968 newvp = dvp; 969 #ifndef NFS_V2_ONLY 970 if (v3) { 971 nfsm_postop_attr(newvp, attrflag, 0); 972 nfsm_postop_attr(dvp, attrflag, 0); 973 } else 974 #endif 975 nfsm_loadattr(newvp, (struct vattr *)0, 0); 976 } else if (flags & ISDOTDOT) { 977 /* 978 * ".." lookup 979 */ 980 VOP_UNLOCK(dvp, 0); 981 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 982 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 983 if (error) { 984 m_freem(mrep); 985 return error; 986 } 987 newvp = NFSTOV(np); 988 989 #ifndef NFS_V2_ONLY 990 if (v3) { 991 nfsm_postop_attr(newvp, attrflag, 0); 992 nfsm_postop_attr(dvp, attrflag, 0); 993 } else 994 #endif 995 nfsm_loadattr(newvp, (struct vattr *)0, 0); 996 } else { 997 /* 998 * Other lookups. 999 */ 1000 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1001 if (error) { 1002 m_freem(mrep); 1003 return error; 1004 } 1005 newvp = NFSTOV(np); 1006 #ifndef NFS_V2_ONLY 1007 if (v3) { 1008 nfsm_postop_attr(newvp, attrflag, 0); 1009 nfsm_postop_attr(dvp, attrflag, 0); 1010 } else 1011 #endif 1012 nfsm_loadattr(newvp, (struct vattr *)0, 0); 1013 } 1014 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 1015 cnp->cn_flags |= SAVENAME; 1016 if ((cnp->cn_flags & MAKEENTRY) && 1017 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 1018 nfs_cache_enter(dvp, newvp, cnp); 1019 } 1020 *vpp = newvp; 1021 nfsm_reqdone; 1022 if (error) { 1023 /* 1024 * We get here only because of errors returned by 1025 * the RPC. Otherwise we'll have returned above 1026 * (the nfsm_* macros will jump to nfsm_reqdone 1027 * on error). 1028 */ 1029 if (error == ENOENT && (cnp->cn_flags & MAKEENTRY) && 1030 cnp->cn_nameiop != CREATE) { 1031 nfs_cache_enter(dvp, NULL, cnp); 1032 } 1033 if (newvp != NULLVP) { 1034 if (newvp == dvp) { 1035 vrele(newvp); 1036 } else { 1037 vput(newvp); 1038 } 1039 } 1040 noentry: 1041 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 1042 (flags & ISLASTCN) && error == ENOENT) { 1043 if (dvp->v_mount->mnt_flag & MNT_RDONLY) { 1044 error = EROFS; 1045 } else { 1046 error = EJUSTRETURN; 1047 cnp->cn_flags |= SAVENAME; 1048 } 1049 } 1050 *vpp = NULL; 1051 return error; 1052 } 1053 1054 validate: 1055 /* 1056 * make sure we have valid type and size. 1057 */ 1058 1059 newvp = *vpp; 1060 if (newvp->v_type == VNON) { 1061 struct vattr vattr; /* dummy */ 1062 1063 KASSERT(VTONFS(newvp)->n_attrstamp == 0); 1064 error = VOP_GETATTR(newvp, &vattr, cnp->cn_cred); 1065 if (error) { 1066 vput(newvp); 1067 *vpp = NULL; 1068 } 1069 } 1070 1071 return error; 1072 } 1073 1074 /* 1075 * nfs read call. 1076 * Just call nfs_bioread() to do the work. 1077 */ 1078 int 1079 nfs_read(v) 1080 void *v; 1081 { 1082 struct vop_read_args /* { 1083 struct vnode *a_vp; 1084 struct uio *a_uio; 1085 int a_ioflag; 1086 kauth_cred_t a_cred; 1087 } */ *ap = v; 1088 struct vnode *vp = ap->a_vp; 1089 1090 if (vp->v_type != VREG) 1091 return EISDIR; 1092 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred, 0)); 1093 } 1094 1095 /* 1096 * nfs readlink call 1097 */ 1098 int 1099 nfs_readlink(v) 1100 void *v; 1101 { 1102 struct vop_readlink_args /* { 1103 struct vnode *a_vp; 1104 struct uio *a_uio; 1105 kauth_cred_t a_cred; 1106 } */ *ap = v; 1107 struct vnode *vp = ap->a_vp; 1108 struct nfsnode *np = VTONFS(vp); 1109 1110 if (vp->v_type != VLNK) 1111 return (EPERM); 1112 1113 if (np->n_rcred != NULL) { 1114 kauth_cred_free(np->n_rcred); 1115 } 1116 np->n_rcred = ap->a_cred; 1117 kauth_cred_hold(np->n_rcred); 1118 1119 return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred, 0)); 1120 } 1121 1122 /* 1123 * Do a readlink rpc. 1124 * Called by nfs_doio() from below the buffer cache. 1125 */ 1126 int 1127 nfs_readlinkrpc(vp, uiop, cred) 1128 struct vnode *vp; 1129 struct uio *uiop; 1130 kauth_cred_t cred; 1131 { 1132 u_int32_t *tl; 1133 char *cp; 1134 int32_t t1, t2; 1135 char *bpos, *dpos, *cp2; 1136 int error = 0; 1137 uint32_t len; 1138 struct mbuf *mreq, *mrep, *md, *mb; 1139 const int v3 = NFS_ISV3(vp); 1140 struct nfsnode *np = VTONFS(vp); 1141 #ifndef NFS_V2_ONLY 1142 int attrflag; 1143 #endif 1144 1145 nfsstats.rpccnt[NFSPROC_READLINK]++; 1146 nfsm_reqhead(np, NFSPROC_READLINK, NFSX_FH(v3)); 1147 nfsm_fhtom(np, v3); 1148 nfsm_request(np, NFSPROC_READLINK, curlwp, cred); 1149 #ifndef NFS_V2_ONLY 1150 if (v3) 1151 nfsm_postop_attr(vp, attrflag, 0); 1152 #endif 1153 if (!error) { 1154 #ifndef NFS_V2_ONLY 1155 if (v3) { 1156 nfsm_dissect(tl, uint32_t *, NFSX_UNSIGNED); 1157 len = fxdr_unsigned(uint32_t, *tl); 1158 if (len > MAXPATHLEN) { 1159 /* 1160 * this pathname is too long for us. 1161 */ 1162 m_freem(mrep); 1163 /* Solaris returns EINVAL. should we follow? */ 1164 error = ENAMETOOLONG; 1165 goto nfsmout; 1166 } 1167 } else 1168 #endif 1169 { 1170 nfsm_strsiz(len, NFS_MAXPATHLEN); 1171 } 1172 nfsm_mtouio(uiop, len); 1173 } 1174 nfsm_reqdone; 1175 return (error); 1176 } 1177 1178 /* 1179 * nfs read rpc call 1180 * Ditto above 1181 */ 1182 int 1183 nfs_readrpc(vp, uiop) 1184 struct vnode *vp; 1185 struct uio *uiop; 1186 { 1187 u_int32_t *tl; 1188 char *cp; 1189 int32_t t1, t2; 1190 char *bpos, *dpos, *cp2; 1191 struct mbuf *mreq, *mrep, *md, *mb; 1192 struct nfsmount *nmp; 1193 int error = 0, len, retlen, tsiz, eof, byte_count; 1194 const int v3 = NFS_ISV3(vp); 1195 struct nfsnode *np = VTONFS(vp); 1196 #ifndef NFS_V2_ONLY 1197 int attrflag; 1198 #endif 1199 1200 #ifndef nolint 1201 eof = 0; 1202 #endif 1203 nmp = VFSTONFS(vp->v_mount); 1204 tsiz = uiop->uio_resid; 1205 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1206 return (EFBIG); 1207 iostat_busy(nmp->nm_stats); 1208 byte_count = 0; /* count bytes actually transferred */ 1209 while (tsiz > 0) { 1210 nfsstats.rpccnt[NFSPROC_READ]++; 1211 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1212 nfsm_reqhead(np, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1213 nfsm_fhtom(np, v3); 1214 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1215 #ifndef NFS_V2_ONLY 1216 if (v3) { 1217 txdr_hyper(uiop->uio_offset, tl); 1218 *(tl + 2) = txdr_unsigned(len); 1219 } else 1220 #endif 1221 { 1222 *tl++ = txdr_unsigned(uiop->uio_offset); 1223 *tl++ = txdr_unsigned(len); 1224 *tl = 0; 1225 } 1226 nfsm_request(np, NFSPROC_READ, curlwp, np->n_rcred); 1227 #ifndef NFS_V2_ONLY 1228 if (v3) { 1229 nfsm_postop_attr(vp, attrflag, NAC_NOTRUNC); 1230 if (error) { 1231 m_freem(mrep); 1232 goto nfsmout; 1233 } 1234 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1235 eof = fxdr_unsigned(int, *(tl + 1)); 1236 } else 1237 #endif 1238 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1239 nfsm_strsiz(retlen, nmp->nm_rsize); 1240 nfsm_mtouio(uiop, retlen); 1241 m_freem(mrep); 1242 tsiz -= retlen; 1243 byte_count += retlen; 1244 #ifndef NFS_V2_ONLY 1245 if (v3) { 1246 if (eof || retlen == 0) 1247 tsiz = 0; 1248 } else 1249 #endif 1250 if (retlen < len) 1251 tsiz = 0; 1252 } 1253 nfsmout: 1254 iostat_unbusy(nmp->nm_stats, byte_count, 1); 1255 return (error); 1256 } 1257 1258 struct nfs_writerpc_context { 1259 kmutex_t nwc_lock; 1260 kcondvar_t nwc_cv; 1261 int nwc_mbufcount; 1262 }; 1263 1264 /* 1265 * free mbuf used to refer protected pages while write rpc call. 1266 * called at splvm. 1267 */ 1268 static void 1269 nfs_writerpc_extfree(struct mbuf *m, void *tbuf, size_t size, void *arg) 1270 { 1271 struct nfs_writerpc_context *ctx = arg; 1272 1273 KASSERT(m != NULL); 1274 KASSERT(ctx != NULL); 1275 pool_cache_put(mb_cache, m); 1276 mutex_enter(&ctx->nwc_lock); 1277 if (--ctx->nwc_mbufcount == 0) { 1278 cv_signal(&ctx->nwc_cv); 1279 } 1280 mutex_exit(&ctx->nwc_lock); 1281 } 1282 1283 /* 1284 * nfs write call 1285 */ 1286 int 1287 nfs_writerpc(vp, uiop, iomode, pageprotected, stalewriteverfp) 1288 struct vnode *vp; 1289 struct uio *uiop; 1290 int *iomode; 1291 bool pageprotected; 1292 bool *stalewriteverfp; 1293 { 1294 u_int32_t *tl; 1295 char *cp; 1296 int32_t t1, t2; 1297 char *bpos, *dpos; 1298 struct mbuf *mreq, *mrep, *md, *mb; 1299 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1300 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR; 1301 const int v3 = NFS_ISV3(vp); 1302 int committed = NFSV3WRITE_FILESYNC; 1303 struct nfsnode *np = VTONFS(vp); 1304 struct nfs_writerpc_context ctx; 1305 int byte_count; 1306 struct lwp *l = NULL; 1307 size_t origresid; 1308 #ifndef NFS_V2_ONLY 1309 char *cp2; 1310 int rlen, commit; 1311 #endif 1312 1313 mutex_init(&ctx.nwc_lock, MUTEX_DRIVER, IPL_VM); 1314 cv_init(&ctx.nwc_cv, "nfsmblk"); 1315 ctx.nwc_mbufcount = 1; 1316 1317 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 1318 panic("writerpc readonly vp %p", vp); 1319 } 1320 1321 #ifdef DIAGNOSTIC 1322 if (uiop->uio_iovcnt != 1) 1323 panic("nfs: writerpc iovcnt > 1"); 1324 #endif 1325 tsiz = uiop->uio_resid; 1326 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1327 return (EFBIG); 1328 if (pageprotected) { 1329 l = curlwp; 1330 uvm_lwp_hold(l); 1331 } 1332 retry: 1333 origresid = uiop->uio_resid; 1334 KASSERT(origresid == uiop->uio_iov->iov_len); 1335 iostat_busy(nmp->nm_stats); 1336 byte_count = 0; /* count of bytes actually written */ 1337 while (tsiz > 0) { 1338 uint32_t datalen; /* data bytes need to be allocated in mbuf */ 1339 uint32_t backup; 1340 bool stalewriteverf = false; 1341 1342 nfsstats.rpccnt[NFSPROC_WRITE]++; 1343 len = min(tsiz, nmp->nm_wsize); 1344 datalen = pageprotected ? 0 : nfsm_rndup(len); 1345 nfsm_reqhead(np, NFSPROC_WRITE, 1346 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + datalen); 1347 nfsm_fhtom(np, v3); 1348 #ifndef NFS_V2_ONLY 1349 if (v3) { 1350 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1351 txdr_hyper(uiop->uio_offset, tl); 1352 tl += 2; 1353 *tl++ = txdr_unsigned(len); 1354 *tl++ = txdr_unsigned(*iomode); 1355 *tl = txdr_unsigned(len); 1356 } else 1357 #endif 1358 { 1359 u_int32_t x; 1360 1361 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1362 /* Set both "begin" and "current" to non-garbage. */ 1363 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1364 *tl++ = x; /* "begin offset" */ 1365 *tl++ = x; /* "current offset" */ 1366 x = txdr_unsigned(len); 1367 *tl++ = x; /* total to this offset */ 1368 *tl = x; /* size of this write */ 1369 1370 } 1371 if (pageprotected) { 1372 /* 1373 * since we know pages can't be modified during i/o, 1374 * no need to copy them for us. 1375 */ 1376 struct mbuf *m; 1377 struct iovec *iovp = uiop->uio_iov; 1378 1379 m = m_get(M_WAIT, MT_DATA); 1380 MCLAIM(m, &nfs_mowner); 1381 MEXTADD(m, iovp->iov_base, len, M_MBUF, 1382 nfs_writerpc_extfree, &ctx); 1383 m->m_flags |= M_EXT_ROMAP; 1384 m->m_len = len; 1385 mb->m_next = m; 1386 /* 1387 * no need to maintain mb and bpos here 1388 * because no one care them later. 1389 */ 1390 #if 0 1391 mb = m; 1392 bpos = mtod(void *, mb) + mb->m_len; 1393 #endif 1394 UIO_ADVANCE(uiop, len); 1395 uiop->uio_offset += len; 1396 mutex_enter(&ctx.nwc_lock); 1397 ctx.nwc_mbufcount++; 1398 mutex_exit(&ctx.nwc_lock); 1399 nfs_zeropad(mb, 0, nfsm_padlen(len)); 1400 } else { 1401 nfsm_uiotom(uiop, len); 1402 } 1403 nfsm_request(np, NFSPROC_WRITE, curlwp, np->n_wcred); 1404 #ifndef NFS_V2_ONLY 1405 if (v3) { 1406 wccflag = NFSV3_WCCCHK; 1407 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, !error); 1408 if (!error) { 1409 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1410 + NFSX_V3WRITEVERF); 1411 rlen = fxdr_unsigned(int, *tl++); 1412 if (rlen == 0) { 1413 error = NFSERR_IO; 1414 m_freem(mrep); 1415 break; 1416 } else if (rlen < len) { 1417 backup = len - rlen; 1418 UIO_ADVANCE(uiop, -backup); 1419 uiop->uio_offset -= backup; 1420 len = rlen; 1421 } 1422 commit = fxdr_unsigned(int, *tl++); 1423 1424 /* 1425 * Return the lowest committment level 1426 * obtained by any of the RPCs. 1427 */ 1428 if (committed == NFSV3WRITE_FILESYNC) 1429 committed = commit; 1430 else if (committed == NFSV3WRITE_DATASYNC && 1431 commit == NFSV3WRITE_UNSTABLE) 1432 committed = commit; 1433 mutex_enter(&nmp->nm_lock); 1434 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0){ 1435 memcpy(nmp->nm_writeverf, tl, 1436 NFSX_V3WRITEVERF); 1437 nmp->nm_iflag |= NFSMNT_HASWRITEVERF; 1438 } else if ((nmp->nm_iflag & 1439 NFSMNT_STALEWRITEVERF) || 1440 memcmp(tl, nmp->nm_writeverf, 1441 NFSX_V3WRITEVERF)) { 1442 memcpy(nmp->nm_writeverf, tl, 1443 NFSX_V3WRITEVERF); 1444 /* 1445 * note NFSMNT_STALEWRITEVERF 1446 * if we're the first thread to 1447 * notice it. 1448 */ 1449 if ((nmp->nm_iflag & 1450 NFSMNT_STALEWRITEVERF) == 0) { 1451 stalewriteverf = true; 1452 nmp->nm_iflag |= 1453 NFSMNT_STALEWRITEVERF; 1454 } 1455 } 1456 mutex_exit(&nmp->nm_lock); 1457 } 1458 } else 1459 #endif 1460 nfsm_loadattr(vp, (struct vattr *)0, NAC_NOTRUNC); 1461 if (wccflag) 1462 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr->va_mtime; 1463 m_freem(mrep); 1464 if (error) 1465 break; 1466 tsiz -= len; 1467 byte_count += len; 1468 if (stalewriteverf) { 1469 *stalewriteverfp = true; 1470 stalewriteverf = false; 1471 if (committed == NFSV3WRITE_UNSTABLE && 1472 len != origresid) { 1473 /* 1474 * if our write requests weren't atomic but 1475 * unstable, datas in previous iterations 1476 * might have already been lost now. 1477 * then, we should resend them to nfsd. 1478 */ 1479 backup = origresid - tsiz; 1480 UIO_ADVANCE(uiop, -backup); 1481 uiop->uio_offset -= backup; 1482 tsiz = origresid; 1483 goto retry; 1484 } 1485 } 1486 } 1487 nfsmout: 1488 iostat_unbusy(nmp->nm_stats, byte_count, 0); 1489 if (pageprotected) { 1490 /* 1491 * wait until mbufs go away. 1492 * retransmitted mbufs can survive longer than rpc requests 1493 * themselves. 1494 */ 1495 mutex_enter(&ctx.nwc_lock); 1496 ctx.nwc_mbufcount--; 1497 while (ctx.nwc_mbufcount > 0) { 1498 cv_wait(&ctx.nwc_cv, &ctx.nwc_lock); 1499 } 1500 mutex_exit(&ctx.nwc_lock); 1501 uvm_lwp_rele(l); 1502 } 1503 mutex_destroy(&ctx.nwc_lock); 1504 cv_destroy(&ctx.nwc_cv); 1505 *iomode = committed; 1506 if (error) 1507 uiop->uio_resid = tsiz; 1508 return (error); 1509 } 1510 1511 /* 1512 * nfs mknod rpc 1513 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1514 * mode set to specify the file type and the size field for rdev. 1515 */ 1516 int 1517 nfs_mknodrpc(dvp, vpp, cnp, vap) 1518 struct vnode *dvp; 1519 struct vnode **vpp; 1520 struct componentname *cnp; 1521 struct vattr *vap; 1522 { 1523 struct nfsv2_sattr *sp; 1524 u_int32_t *tl; 1525 char *cp; 1526 int32_t t1, t2; 1527 struct vnode *newvp = (struct vnode *)0; 1528 struct nfsnode *dnp, *np; 1529 char *cp2; 1530 char *bpos, *dpos; 1531 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1532 struct mbuf *mreq, *mrep, *md, *mb; 1533 u_int32_t rdev; 1534 const int v3 = NFS_ISV3(dvp); 1535 1536 if (vap->va_type == VCHR || vap->va_type == VBLK) 1537 rdev = txdr_unsigned(vap->va_rdev); 1538 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1539 rdev = nfs_xdrneg1; 1540 else { 1541 VOP_ABORTOP(dvp, cnp); 1542 vput(dvp); 1543 return (EOPNOTSUPP); 1544 } 1545 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1546 dnp = VTONFS(dvp); 1547 nfsm_reqhead(dnp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1548 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1549 nfsm_fhtom(dnp, v3); 1550 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1551 #ifndef NFS_V2_ONLY 1552 if (v3) { 1553 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1554 *tl++ = vtonfsv3_type(vap->va_type); 1555 nfsm_v3attrbuild(vap, false); 1556 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1557 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1558 *tl++ = txdr_unsigned(major(vap->va_rdev)); 1559 *tl = txdr_unsigned(minor(vap->va_rdev)); 1560 } 1561 } else 1562 #endif 1563 { 1564 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1565 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1566 sp->sa_uid = nfs_xdrneg1; 1567 sp->sa_gid = nfs_xdrneg1; 1568 sp->sa_size = rdev; 1569 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1570 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1571 } 1572 nfsm_request(dnp, NFSPROC_MKNOD, curlwp, cnp->cn_cred); 1573 if (!error) { 1574 nfsm_mtofh(dvp, newvp, v3, gotvp); 1575 if (!gotvp) { 1576 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1577 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1578 if (!error) 1579 newvp = NFSTOV(np); 1580 } 1581 } 1582 #ifndef NFS_V2_ONLY 1583 if (v3) 1584 nfsm_wcc_data(dvp, wccflag, 0, !error); 1585 #endif 1586 nfsm_reqdone; 1587 if (error) { 1588 if (newvp) 1589 vput(newvp); 1590 } else { 1591 if (cnp->cn_flags & MAKEENTRY) 1592 nfs_cache_enter(dvp, newvp, cnp); 1593 *vpp = newvp; 1594 } 1595 PNBUF_PUT(cnp->cn_pnbuf); 1596 VTONFS(dvp)->n_flag |= NMODIFIED; 1597 if (!wccflag) 1598 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1599 vput(dvp); 1600 return (error); 1601 } 1602 1603 /* 1604 * nfs mknod vop 1605 * just call nfs_mknodrpc() to do the work. 1606 */ 1607 /* ARGSUSED */ 1608 int 1609 nfs_mknod(v) 1610 void *v; 1611 { 1612 struct vop_mknod_args /* { 1613 struct vnode *a_dvp; 1614 struct vnode **a_vpp; 1615 struct componentname *a_cnp; 1616 struct vattr *a_vap; 1617 } */ *ap = v; 1618 struct vnode *dvp = ap->a_dvp; 1619 struct componentname *cnp = ap->a_cnp; 1620 int error; 1621 1622 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, ap->a_vap); 1623 VN_KNOTE(dvp, NOTE_WRITE); 1624 if (error == 0 || error == EEXIST) 1625 cache_purge1(dvp, cnp, 0); 1626 return (error); 1627 } 1628 1629 #ifndef NFS_V2_ONLY 1630 static u_long create_verf; 1631 #endif 1632 /* 1633 * nfs file create call 1634 */ 1635 int 1636 nfs_create(v) 1637 void *v; 1638 { 1639 struct vop_create_args /* { 1640 struct vnode *a_dvp; 1641 struct vnode **a_vpp; 1642 struct componentname *a_cnp; 1643 struct vattr *a_vap; 1644 } */ *ap = v; 1645 struct vnode *dvp = ap->a_dvp; 1646 struct vattr *vap = ap->a_vap; 1647 struct componentname *cnp = ap->a_cnp; 1648 struct nfsv2_sattr *sp; 1649 u_int32_t *tl; 1650 char *cp; 1651 int32_t t1, t2; 1652 struct nfsnode *dnp, *np = (struct nfsnode *)0; 1653 struct vnode *newvp = (struct vnode *)0; 1654 char *bpos, *dpos, *cp2; 1655 int error, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1656 struct mbuf *mreq, *mrep, *md, *mb; 1657 const int v3 = NFS_ISV3(dvp); 1658 u_int32_t excl_mode = NFSV3CREATE_UNCHECKED; 1659 1660 /* 1661 * Oops, not for me.. 1662 */ 1663 if (vap->va_type == VSOCK) 1664 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1665 1666 KASSERT(vap->va_type == VREG); 1667 1668 #ifdef VA_EXCLUSIVE 1669 if (vap->va_vaflags & VA_EXCLUSIVE) { 1670 excl_mode = NFSV3CREATE_EXCLUSIVE; 1671 } 1672 #endif 1673 again: 1674 error = 0; 1675 nfsstats.rpccnt[NFSPROC_CREATE]++; 1676 dnp = VTONFS(dvp); 1677 nfsm_reqhead(dnp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1678 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1679 nfsm_fhtom(dnp, v3); 1680 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1681 #ifndef NFS_V2_ONLY 1682 if (v3) { 1683 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1684 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1685 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1686 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1687 #ifdef INET 1688 if (TAILQ_FIRST(&in_ifaddrhead)) 1689 *tl++ = TAILQ_FIRST(&in_ifaddrhead)-> 1690 ia_addr.sin_addr.s_addr; 1691 else 1692 *tl++ = create_verf; 1693 #else 1694 *tl++ = create_verf; 1695 #endif 1696 *tl = ++create_verf; 1697 } else { 1698 *tl = txdr_unsigned(excl_mode); 1699 nfsm_v3attrbuild(vap, false); 1700 } 1701 } else 1702 #endif 1703 { 1704 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1705 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1706 sp->sa_uid = nfs_xdrneg1; 1707 sp->sa_gid = nfs_xdrneg1; 1708 sp->sa_size = 0; 1709 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1710 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1711 } 1712 nfsm_request(dnp, NFSPROC_CREATE, curlwp, cnp->cn_cred); 1713 if (!error) { 1714 nfsm_mtofh(dvp, newvp, v3, gotvp); 1715 if (!gotvp) { 1716 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1717 cnp->cn_namelen, cnp->cn_cred, curlwp, &np); 1718 if (!error) 1719 newvp = NFSTOV(np); 1720 } 1721 } 1722 #ifndef NFS_V2_ONLY 1723 if (v3) 1724 nfsm_wcc_data(dvp, wccflag, 0, !error); 1725 #endif 1726 nfsm_reqdone; 1727 if (error) { 1728 /* 1729 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 1730 */ 1731 if (v3 && error == ENOTSUP) { 1732 if (excl_mode == NFSV3CREATE_EXCLUSIVE) { 1733 excl_mode = NFSV3CREATE_GUARDED; 1734 goto again; 1735 } else if (excl_mode == NFSV3CREATE_GUARDED) { 1736 excl_mode = NFSV3CREATE_UNCHECKED; 1737 goto again; 1738 } 1739 } 1740 } else if (v3 && (excl_mode == NFSV3CREATE_EXCLUSIVE)) { 1741 struct timespec ts; 1742 1743 getnanotime(&ts); 1744 1745 /* 1746 * make sure that we'll update timestamps as 1747 * most server implementations use them to store 1748 * the create verifier. 1749 * 1750 * XXX it's better to use TOSERVER always. 1751 */ 1752 1753 if (vap->va_atime.tv_sec == VNOVAL) 1754 vap->va_atime = ts; 1755 if (vap->va_mtime.tv_sec == VNOVAL) 1756 vap->va_mtime = ts; 1757 1758 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, curlwp); 1759 } 1760 if (error == 0) { 1761 if (cnp->cn_flags & MAKEENTRY) 1762 nfs_cache_enter(dvp, newvp, cnp); 1763 else 1764 cache_purge1(dvp, cnp, 0); 1765 *ap->a_vpp = newvp; 1766 } else { 1767 if (newvp) 1768 vput(newvp); 1769 if (error == EEXIST) 1770 cache_purge1(dvp, cnp, 0); 1771 } 1772 PNBUF_PUT(cnp->cn_pnbuf); 1773 VTONFS(dvp)->n_flag |= NMODIFIED; 1774 if (!wccflag) 1775 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1776 VN_KNOTE(ap->a_dvp, NOTE_WRITE); 1777 vput(dvp); 1778 return (error); 1779 } 1780 1781 /* 1782 * nfs file remove call 1783 * To try and make nfs semantics closer to ufs semantics, a file that has 1784 * other processes using the vnode is renamed instead of removed and then 1785 * removed later on the last close. 1786 * - If v_usecount > 1 1787 * If a rename is not already in the works 1788 * call nfs_sillyrename() to set it up 1789 * else 1790 * do the remove rpc 1791 */ 1792 int 1793 nfs_remove(v) 1794 void *v; 1795 { 1796 struct vop_remove_args /* { 1797 struct vnodeop_desc *a_desc; 1798 struct vnode * a_dvp; 1799 struct vnode * a_vp; 1800 struct componentname * a_cnp; 1801 } */ *ap = v; 1802 struct vnode *vp = ap->a_vp; 1803 struct vnode *dvp = ap->a_dvp; 1804 struct componentname *cnp = ap->a_cnp; 1805 struct nfsnode *np = VTONFS(vp); 1806 int error = 0; 1807 struct vattr vattr; 1808 1809 #ifndef DIAGNOSTIC 1810 if ((cnp->cn_flags & HASBUF) == 0) 1811 panic("nfs_remove: no name"); 1812 if (vp->v_usecount < 1) 1813 panic("nfs_remove: bad v_usecount"); 1814 #endif 1815 if (vp->v_type == VDIR) 1816 error = EPERM; 1817 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1818 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 && 1819 vattr.va_nlink > 1)) { 1820 /* 1821 * Purge the name cache so that the chance of a lookup for 1822 * the name succeeding while the remove is in progress is 1823 * minimized. Without node locking it can still happen, such 1824 * that an I/O op returns ESTALE, but since you get this if 1825 * another host removes the file.. 1826 */ 1827 cache_purge(vp); 1828 /* 1829 * throw away biocache buffers, mainly to avoid 1830 * unnecessary delayed writes later. 1831 */ 1832 error = nfs_vinvalbuf(vp, 0, cnp->cn_cred, curlwp, 1); 1833 /* Do the rpc */ 1834 if (error != EINTR) 1835 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1836 cnp->cn_namelen, cnp->cn_cred, curlwp); 1837 } else if (!np->n_sillyrename) 1838 error = nfs_sillyrename(dvp, vp, cnp, false); 1839 PNBUF_PUT(cnp->cn_pnbuf); 1840 if (!error && nfs_getattrcache(vp, &vattr) == 0 && 1841 vattr.va_nlink == 1) { 1842 np->n_flag |= NREMOVED; 1843 } 1844 NFS_INVALIDATE_ATTRCACHE(np); 1845 VN_KNOTE(vp, NOTE_DELETE); 1846 VN_KNOTE(dvp, NOTE_WRITE); 1847 if (dvp == vp) 1848 vrele(vp); 1849 else 1850 vput(vp); 1851 vput(dvp); 1852 return (error); 1853 } 1854 1855 /* 1856 * nfs file remove rpc called from nfs_inactive 1857 */ 1858 int 1859 nfs_removeit(sp) 1860 struct sillyrename *sp; 1861 { 1862 1863 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, 1864 (struct lwp *)0)); 1865 } 1866 1867 /* 1868 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1869 */ 1870 int 1871 nfs_removerpc(dvp, name, namelen, cred, l) 1872 struct vnode *dvp; 1873 const char *name; 1874 int namelen; 1875 kauth_cred_t cred; 1876 struct lwp *l; 1877 { 1878 u_int32_t *tl; 1879 char *cp; 1880 #ifndef NFS_V2_ONLY 1881 int32_t t1; 1882 char *cp2; 1883 #endif 1884 int32_t t2; 1885 char *bpos, *dpos; 1886 int error = 0, wccflag = NFSV3_WCCRATTR; 1887 struct mbuf *mreq, *mrep, *md, *mb; 1888 const int v3 = NFS_ISV3(dvp); 1889 int rexmit = 0; 1890 struct nfsnode *dnp = VTONFS(dvp); 1891 1892 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1893 nfsm_reqhead(dnp, NFSPROC_REMOVE, 1894 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1895 nfsm_fhtom(dnp, v3); 1896 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1897 nfsm_request1(dnp, NFSPROC_REMOVE, l, cred, &rexmit); 1898 #ifndef NFS_V2_ONLY 1899 if (v3) 1900 nfsm_wcc_data(dvp, wccflag, 0, !error); 1901 #endif 1902 nfsm_reqdone; 1903 VTONFS(dvp)->n_flag |= NMODIFIED; 1904 if (!wccflag) 1905 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 1906 /* 1907 * Kludge City: If the first reply to the remove rpc is lost.. 1908 * the reply to the retransmitted request will be ENOENT 1909 * since the file was in fact removed 1910 * Therefore, we cheat and return success. 1911 */ 1912 if (rexmit && error == ENOENT) 1913 error = 0; 1914 return (error); 1915 } 1916 1917 /* 1918 * nfs file rename call 1919 */ 1920 int 1921 nfs_rename(v) 1922 void *v; 1923 { 1924 struct vop_rename_args /* { 1925 struct vnode *a_fdvp; 1926 struct vnode *a_fvp; 1927 struct componentname *a_fcnp; 1928 struct vnode *a_tdvp; 1929 struct vnode *a_tvp; 1930 struct componentname *a_tcnp; 1931 } */ *ap = v; 1932 struct vnode *fvp = ap->a_fvp; 1933 struct vnode *tvp = ap->a_tvp; 1934 struct vnode *fdvp = ap->a_fdvp; 1935 struct vnode *tdvp = ap->a_tdvp; 1936 struct componentname *tcnp = ap->a_tcnp; 1937 struct componentname *fcnp = ap->a_fcnp; 1938 int error; 1939 1940 #ifndef DIAGNOSTIC 1941 if ((tcnp->cn_flags & HASBUF) == 0 || 1942 (fcnp->cn_flags & HASBUF) == 0) 1943 panic("nfs_rename: no name"); 1944 #endif 1945 /* Check for cross-device rename */ 1946 if ((fvp->v_mount != tdvp->v_mount) || 1947 (tvp && (fvp->v_mount != tvp->v_mount))) { 1948 error = EXDEV; 1949 goto out; 1950 } 1951 1952 /* 1953 * If the tvp exists and is in use, sillyrename it before doing the 1954 * rename of the new file over it. 1955 * 1956 * Have sillyrename use link instead of rename if possible, 1957 * so that we don't lose the file if the rename fails, and so 1958 * that there's no window when the "to" file doesn't exist. 1959 */ 1960 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1961 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp, true)) { 1962 VN_KNOTE(tvp, NOTE_DELETE); 1963 vput(tvp); 1964 tvp = NULL; 1965 } 1966 1967 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1968 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1969 curlwp); 1970 1971 VN_KNOTE(fdvp, NOTE_WRITE); 1972 VN_KNOTE(tdvp, NOTE_WRITE); 1973 if (error == 0 || error == EEXIST) { 1974 if (fvp->v_type == VDIR) 1975 cache_purge(fvp); 1976 else 1977 cache_purge1(fdvp, fcnp, 0); 1978 if (tvp != NULL && tvp->v_type == VDIR) 1979 cache_purge(tvp); 1980 else 1981 cache_purge1(tdvp, tcnp, 0); 1982 } 1983 out: 1984 if (tdvp == tvp) 1985 vrele(tdvp); 1986 else 1987 vput(tdvp); 1988 if (tvp) 1989 vput(tvp); 1990 vrele(fdvp); 1991 vrele(fvp); 1992 return (error); 1993 } 1994 1995 /* 1996 * nfs file rename rpc called from nfs_remove() above 1997 */ 1998 int 1999 nfs_renameit(sdvp, scnp, sp) 2000 struct vnode *sdvp; 2001 struct componentname *scnp; 2002 struct sillyrename *sp; 2003 { 2004 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 2005 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, curlwp)); 2006 } 2007 2008 /* 2009 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2010 */ 2011 int 2012 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, l) 2013 struct vnode *fdvp; 2014 const char *fnameptr; 2015 int fnamelen; 2016 struct vnode *tdvp; 2017 const char *tnameptr; 2018 int tnamelen; 2019 kauth_cred_t cred; 2020 struct lwp *l; 2021 { 2022 u_int32_t *tl; 2023 char *cp; 2024 #ifndef NFS_V2_ONLY 2025 int32_t t1; 2026 char *cp2; 2027 #endif 2028 int32_t t2; 2029 char *bpos, *dpos; 2030 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 2031 struct mbuf *mreq, *mrep, *md, *mb; 2032 const int v3 = NFS_ISV3(fdvp); 2033 int rexmit = 0; 2034 struct nfsnode *fdnp = VTONFS(fdvp); 2035 2036 nfsstats.rpccnt[NFSPROC_RENAME]++; 2037 nfsm_reqhead(fdnp, NFSPROC_RENAME, 2038 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 2039 nfsm_rndup(tnamelen)); 2040 nfsm_fhtom(fdnp, v3); 2041 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 2042 nfsm_fhtom(VTONFS(tdvp), v3); 2043 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 2044 nfsm_request1(fdnp, NFSPROC_RENAME, l, cred, &rexmit); 2045 #ifndef NFS_V2_ONLY 2046 if (v3) { 2047 nfsm_wcc_data(fdvp, fwccflag, 0, !error); 2048 nfsm_wcc_data(tdvp, twccflag, 0, !error); 2049 } 2050 #endif 2051 nfsm_reqdone; 2052 VTONFS(fdvp)->n_flag |= NMODIFIED; 2053 VTONFS(tdvp)->n_flag |= NMODIFIED; 2054 if (!fwccflag) 2055 NFS_INVALIDATE_ATTRCACHE(VTONFS(fdvp)); 2056 if (!twccflag) 2057 NFS_INVALIDATE_ATTRCACHE(VTONFS(tdvp)); 2058 /* 2059 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2060 */ 2061 if (rexmit && error == ENOENT) 2062 error = 0; 2063 return (error); 2064 } 2065 2066 /* 2067 * NFS link RPC, called from nfs_link. 2068 * Assumes dvp and vp locked, and leaves them that way. 2069 */ 2070 2071 static int 2072 nfs_linkrpc(struct vnode *dvp, struct vnode *vp, const char *name, 2073 size_t namelen, kauth_cred_t cred, struct lwp *l) 2074 { 2075 u_int32_t *tl; 2076 char *cp; 2077 #ifndef NFS_V2_ONLY 2078 int32_t t1; 2079 char *cp2; 2080 #endif 2081 int32_t t2; 2082 char *bpos, *dpos; 2083 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2084 struct mbuf *mreq, *mrep, *md, *mb; 2085 const int v3 = NFS_ISV3(dvp); 2086 int rexmit = 0; 2087 struct nfsnode *np = VTONFS(vp); 2088 2089 nfsstats.rpccnt[NFSPROC_LINK]++; 2090 nfsm_reqhead(np, NFSPROC_LINK, 2091 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(namelen)); 2092 nfsm_fhtom(np, v3); 2093 nfsm_fhtom(VTONFS(dvp), v3); 2094 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 2095 nfsm_request1(np, NFSPROC_LINK, l, cred, &rexmit); 2096 #ifndef NFS_V2_ONLY 2097 if (v3) { 2098 nfsm_postop_attr(vp, attrflag, 0); 2099 nfsm_wcc_data(dvp, wccflag, 0, !error); 2100 } 2101 #endif 2102 nfsm_reqdone; 2103 2104 VTONFS(dvp)->n_flag |= NMODIFIED; 2105 if (!attrflag) 2106 NFS_INVALIDATE_ATTRCACHE(VTONFS(vp)); 2107 if (!wccflag) 2108 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2109 2110 /* 2111 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2112 */ 2113 if (rexmit && error == EEXIST) 2114 error = 0; 2115 2116 return error; 2117 } 2118 2119 /* 2120 * nfs hard link create call 2121 */ 2122 int 2123 nfs_link(v) 2124 void *v; 2125 { 2126 struct vop_link_args /* { 2127 struct vnode *a_dvp; 2128 struct vnode *a_vp; 2129 struct componentname *a_cnp; 2130 } */ *ap = v; 2131 struct vnode *vp = ap->a_vp; 2132 struct vnode *dvp = ap->a_dvp; 2133 struct componentname *cnp = ap->a_cnp; 2134 int error = 0; 2135 2136 if (dvp->v_mount != vp->v_mount) { 2137 VOP_ABORTOP(dvp, cnp); 2138 vput(dvp); 2139 return (EXDEV); 2140 } 2141 if (dvp != vp) { 2142 error = vn_lock(vp, LK_EXCLUSIVE); 2143 if (error != 0) { 2144 VOP_ABORTOP(dvp, cnp); 2145 vput(dvp); 2146 return error; 2147 } 2148 } 2149 2150 /* 2151 * Push all writes to the server, so that the attribute cache 2152 * doesn't get "out of sync" with the server. 2153 * XXX There should be a better way! 2154 */ 2155 VOP_FSYNC(vp, cnp->cn_cred, FSYNC_WAIT, 0, 0); 2156 2157 error = nfs_linkrpc(dvp, vp, cnp->cn_nameptr, cnp->cn_namelen, 2158 cnp->cn_cred, curlwp); 2159 2160 if (error == 0) 2161 cache_purge1(dvp, cnp, 0); 2162 PNBUF_PUT(cnp->cn_pnbuf); 2163 if (dvp != vp) 2164 VOP_UNLOCK(vp, 0); 2165 VN_KNOTE(vp, NOTE_LINK); 2166 VN_KNOTE(dvp, NOTE_WRITE); 2167 vput(dvp); 2168 return (error); 2169 } 2170 2171 /* 2172 * nfs symbolic link create call 2173 */ 2174 int 2175 nfs_symlink(v) 2176 void *v; 2177 { 2178 struct vop_symlink_args /* { 2179 struct vnode *a_dvp; 2180 struct vnode **a_vpp; 2181 struct componentname *a_cnp; 2182 struct vattr *a_vap; 2183 char *a_target; 2184 } */ *ap = v; 2185 struct vnode *dvp = ap->a_dvp; 2186 struct vattr *vap = ap->a_vap; 2187 struct componentname *cnp = ap->a_cnp; 2188 struct nfsv2_sattr *sp; 2189 u_int32_t *tl; 2190 char *cp; 2191 int32_t t1, t2; 2192 char *bpos, *dpos, *cp2; 2193 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2194 struct mbuf *mreq, *mrep, *md, *mb; 2195 struct vnode *newvp = (struct vnode *)0; 2196 const int v3 = NFS_ISV3(dvp); 2197 int rexmit = 0; 2198 struct nfsnode *dnp = VTONFS(dvp); 2199 2200 *ap->a_vpp = NULL; 2201 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2202 slen = strlen(ap->a_target); 2203 nfsm_reqhead(dnp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 2204 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 2205 nfsm_fhtom(dnp, v3); 2206 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2207 #ifndef NFS_V2_ONlY 2208 if (v3) 2209 nfsm_v3attrbuild(vap, false); 2210 #endif 2211 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 2212 #ifndef NFS_V2_ONlY 2213 if (!v3) { 2214 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2215 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2216 sp->sa_uid = nfs_xdrneg1; 2217 sp->sa_gid = nfs_xdrneg1; 2218 sp->sa_size = nfs_xdrneg1; 2219 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2220 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2221 } 2222 #endif 2223 nfsm_request1(dnp, NFSPROC_SYMLINK, curlwp, cnp->cn_cred, 2224 &rexmit); 2225 #ifndef NFS_V2_ONlY 2226 if (v3) { 2227 if (!error) 2228 nfsm_mtofh(dvp, newvp, v3, gotvp); 2229 nfsm_wcc_data(dvp, wccflag, 0, !error); 2230 } 2231 #endif 2232 nfsm_reqdone; 2233 /* 2234 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2235 */ 2236 if (rexmit && error == EEXIST) 2237 error = 0; 2238 if (error == 0 || error == EEXIST) 2239 cache_purge1(dvp, cnp, 0); 2240 if (error == 0 && newvp == NULL) { 2241 struct nfsnode *np = NULL; 2242 2243 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2244 cnp->cn_cred, curlwp, &np); 2245 if (error == 0) 2246 newvp = NFSTOV(np); 2247 } 2248 if (error) { 2249 if (newvp != NULL) 2250 vput(newvp); 2251 } else { 2252 *ap->a_vpp = newvp; 2253 } 2254 PNBUF_PUT(cnp->cn_pnbuf); 2255 VTONFS(dvp)->n_flag |= NMODIFIED; 2256 if (!wccflag) 2257 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2258 VN_KNOTE(dvp, NOTE_WRITE); 2259 vput(dvp); 2260 return (error); 2261 } 2262 2263 /* 2264 * nfs make dir call 2265 */ 2266 int 2267 nfs_mkdir(v) 2268 void *v; 2269 { 2270 struct vop_mkdir_args /* { 2271 struct vnode *a_dvp; 2272 struct vnode **a_vpp; 2273 struct componentname *a_cnp; 2274 struct vattr *a_vap; 2275 } */ *ap = v; 2276 struct vnode *dvp = ap->a_dvp; 2277 struct vattr *vap = ap->a_vap; 2278 struct componentname *cnp = ap->a_cnp; 2279 struct nfsv2_sattr *sp; 2280 u_int32_t *tl; 2281 char *cp; 2282 int32_t t1, t2; 2283 int len; 2284 struct nfsnode *dnp = VTONFS(dvp), *np = (struct nfsnode *)0; 2285 struct vnode *newvp = (struct vnode *)0; 2286 char *bpos, *dpos, *cp2; 2287 int error = 0, wccflag = NFSV3_WCCRATTR; 2288 int gotvp = 0; 2289 int rexmit = 0; 2290 struct mbuf *mreq, *mrep, *md, *mb; 2291 const int v3 = NFS_ISV3(dvp); 2292 2293 len = cnp->cn_namelen; 2294 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2295 nfsm_reqhead(dnp, NFSPROC_MKDIR, 2296 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2297 nfsm_fhtom(dnp, v3); 2298 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2299 #ifndef NFS_V2_ONLY 2300 if (v3) { 2301 nfsm_v3attrbuild(vap, false); 2302 } else 2303 #endif 2304 { 2305 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2306 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2307 sp->sa_uid = nfs_xdrneg1; 2308 sp->sa_gid = nfs_xdrneg1; 2309 sp->sa_size = nfs_xdrneg1; 2310 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2311 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2312 } 2313 nfsm_request1(dnp, NFSPROC_MKDIR, curlwp, cnp->cn_cred, &rexmit); 2314 if (!error) 2315 nfsm_mtofh(dvp, newvp, v3, gotvp); 2316 if (v3) 2317 nfsm_wcc_data(dvp, wccflag, 0, !error); 2318 nfsm_reqdone; 2319 VTONFS(dvp)->n_flag |= NMODIFIED; 2320 if (!wccflag) 2321 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2322 /* 2323 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2324 * if we can succeed in looking up the directory. 2325 */ 2326 if ((rexmit && error == EEXIST) || (!error && !gotvp)) { 2327 if (newvp) { 2328 vput(newvp); 2329 newvp = (struct vnode *)0; 2330 } 2331 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2332 curlwp, &np); 2333 if (!error) { 2334 newvp = NFSTOV(np); 2335 if (newvp->v_type != VDIR || newvp == dvp) 2336 error = EEXIST; 2337 } 2338 } 2339 if (error) { 2340 if (newvp) { 2341 if (dvp != newvp) 2342 vput(newvp); 2343 else 2344 vrele(newvp); 2345 } 2346 } else { 2347 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2348 if (cnp->cn_flags & MAKEENTRY) 2349 nfs_cache_enter(dvp, newvp, cnp); 2350 *ap->a_vpp = newvp; 2351 } 2352 PNBUF_PUT(cnp->cn_pnbuf); 2353 vput(dvp); 2354 return (error); 2355 } 2356 2357 /* 2358 * nfs remove directory call 2359 */ 2360 int 2361 nfs_rmdir(v) 2362 void *v; 2363 { 2364 struct vop_rmdir_args /* { 2365 struct vnode *a_dvp; 2366 struct vnode *a_vp; 2367 struct componentname *a_cnp; 2368 } */ *ap = v; 2369 struct vnode *vp = ap->a_vp; 2370 struct vnode *dvp = ap->a_dvp; 2371 struct componentname *cnp = ap->a_cnp; 2372 u_int32_t *tl; 2373 char *cp; 2374 #ifndef NFS_V2_ONLY 2375 int32_t t1; 2376 char *cp2; 2377 #endif 2378 int32_t t2; 2379 char *bpos, *dpos; 2380 int error = 0, wccflag = NFSV3_WCCRATTR; 2381 int rexmit = 0; 2382 struct mbuf *mreq, *mrep, *md, *mb; 2383 const int v3 = NFS_ISV3(dvp); 2384 struct nfsnode *dnp; 2385 2386 if (dvp == vp) { 2387 vrele(dvp); 2388 vput(dvp); 2389 PNBUF_PUT(cnp->cn_pnbuf); 2390 return (EINVAL); 2391 } 2392 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2393 dnp = VTONFS(dvp); 2394 nfsm_reqhead(dnp, NFSPROC_RMDIR, 2395 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2396 nfsm_fhtom(dnp, v3); 2397 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2398 nfsm_request1(dnp, NFSPROC_RMDIR, curlwp, cnp->cn_cred, &rexmit); 2399 #ifndef NFS_V2_ONLY 2400 if (v3) 2401 nfsm_wcc_data(dvp, wccflag, 0, !error); 2402 #endif 2403 nfsm_reqdone; 2404 PNBUF_PUT(cnp->cn_pnbuf); 2405 VTONFS(dvp)->n_flag |= NMODIFIED; 2406 if (!wccflag) 2407 NFS_INVALIDATE_ATTRCACHE(VTONFS(dvp)); 2408 VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK); 2409 VN_KNOTE(vp, NOTE_DELETE); 2410 cache_purge(vp); 2411 vput(vp); 2412 vput(dvp); 2413 /* 2414 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2415 */ 2416 if (rexmit && error == ENOENT) 2417 error = 0; 2418 return (error); 2419 } 2420 2421 /* 2422 * nfs readdir call 2423 */ 2424 int 2425 nfs_readdir(v) 2426 void *v; 2427 { 2428 struct vop_readdir_args /* { 2429 struct vnode *a_vp; 2430 struct uio *a_uio; 2431 kauth_cred_t a_cred; 2432 int *a_eofflag; 2433 off_t **a_cookies; 2434 int *a_ncookies; 2435 } */ *ap = v; 2436 struct vnode *vp = ap->a_vp; 2437 struct uio *uio = ap->a_uio; 2438 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2439 char *base = uio->uio_iov->iov_base; 2440 int tresid, error; 2441 size_t count, lost; 2442 struct dirent *dp; 2443 off_t *cookies = NULL; 2444 int ncookies = 0, nc; 2445 2446 if (vp->v_type != VDIR) 2447 return (EPERM); 2448 2449 lost = uio->uio_resid & (NFS_DIRFRAGSIZ - 1); 2450 count = uio->uio_resid - lost; 2451 if (count <= 0) 2452 return (EINVAL); 2453 2454 /* 2455 * Call nfs_bioread() to do the real work. 2456 */ 2457 tresid = uio->uio_resid = count; 2458 error = nfs_bioread(vp, uio, 0, ap->a_cred, 2459 ap->a_cookies ? NFSBIO_CACHECOOKIES : 0); 2460 2461 if (!error && ap->a_cookies) { 2462 ncookies = count / 16; 2463 cookies = malloc(sizeof (off_t) * ncookies, M_TEMP, M_WAITOK); 2464 *ap->a_cookies = cookies; 2465 } 2466 2467 if (!error && uio->uio_resid == tresid) { 2468 uio->uio_resid += lost; 2469 nfsstats.direofcache_misses++; 2470 if (ap->a_cookies) 2471 *ap->a_ncookies = 0; 2472 *ap->a_eofflag = 1; 2473 return (0); 2474 } 2475 2476 if (!error && ap->a_cookies) { 2477 /* 2478 * Only the NFS server and emulations use cookies, and they 2479 * load the directory block into system space, so we can 2480 * just look at it directly. 2481 */ 2482 if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace) || 2483 uio->uio_iovcnt != 1) 2484 panic("nfs_readdir: lost in space"); 2485 for (nc = 0; ncookies-- && 2486 base < (char *)uio->uio_iov->iov_base; nc++){ 2487 dp = (struct dirent *) base; 2488 if (dp->d_reclen == 0) 2489 break; 2490 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 2491 *(cookies++) = (off_t)NFS_GETCOOKIE32(dp); 2492 else 2493 *(cookies++) = NFS_GETCOOKIE(dp); 2494 base += dp->d_reclen; 2495 } 2496 uio->uio_resid += 2497 ((char *)uio->uio_iov->iov_base - base); 2498 uio->uio_iov->iov_len += 2499 ((char *)uio->uio_iov->iov_base - base); 2500 uio->uio_iov->iov_base = base; 2501 *ap->a_ncookies = nc; 2502 } 2503 2504 uio->uio_resid += lost; 2505 *ap->a_eofflag = 0; 2506 return (error); 2507 } 2508 2509 /* 2510 * Readdir rpc call. 2511 * Called from below the buffer cache by nfs_doio(). 2512 */ 2513 int 2514 nfs_readdirrpc(vp, uiop, cred) 2515 struct vnode *vp; 2516 struct uio *uiop; 2517 kauth_cred_t cred; 2518 { 2519 int len, left; 2520 struct dirent *dp = NULL; 2521 u_int32_t *tl; 2522 char *cp; 2523 int32_t t1, t2; 2524 char *bpos, *dpos, *cp2; 2525 struct mbuf *mreq, *mrep, *md, *mb; 2526 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2527 struct nfsnode *dnp = VTONFS(vp); 2528 u_quad_t fileno; 2529 int error = 0, more_dirs = 1, blksiz = 0, bigenough = 1; 2530 #ifndef NFS_V2_ONLY 2531 int attrflag; 2532 #endif 2533 int nrpcs = 0, reclen; 2534 const int v3 = NFS_ISV3(vp); 2535 2536 #ifdef DIAGNOSTIC 2537 /* 2538 * Should be called from buffer cache, so only amount of 2539 * NFS_DIRBLKSIZ will be requested. 2540 */ 2541 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2542 panic("nfs readdirrpc bad uio"); 2543 #endif 2544 2545 /* 2546 * Loop around doing readdir rpc's of size nm_readdirsize 2547 * truncated to a multiple of NFS_DIRFRAGSIZ. 2548 * The stopping criteria is EOF or buffer full. 2549 */ 2550 while (more_dirs && bigenough) { 2551 /* 2552 * Heuristic: don't bother to do another RPC to further 2553 * fill up this block if there is not much room left. (< 50% 2554 * of the readdir RPC size). This wastes some buffer space 2555 * but can save up to 50% in RPC calls. 2556 */ 2557 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2558 bigenough = 0; 2559 break; 2560 } 2561 nfsstats.rpccnt[NFSPROC_READDIR]++; 2562 nfsm_reqhead(dnp, NFSPROC_READDIR, NFSX_FH(v3) + 2563 NFSX_READDIR(v3)); 2564 nfsm_fhtom(dnp, v3); 2565 #ifndef NFS_V2_ONLY 2566 if (v3) { 2567 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2568 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2569 txdr_swapcookie3(uiop->uio_offset, tl); 2570 } else { 2571 txdr_cookie3(uiop->uio_offset, tl); 2572 } 2573 tl += 2; 2574 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2575 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2576 } else 2577 #endif 2578 { 2579 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2580 *tl++ = txdr_unsigned(uiop->uio_offset); 2581 } 2582 *tl = txdr_unsigned(nmp->nm_readdirsize); 2583 nfsm_request(dnp, NFSPROC_READDIR, curlwp, cred); 2584 nrpcs++; 2585 #ifndef NFS_V2_ONLY 2586 if (v3) { 2587 nfsm_postop_attr(vp, attrflag, 0); 2588 if (!error) { 2589 nfsm_dissect(tl, u_int32_t *, 2590 2 * NFSX_UNSIGNED); 2591 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2592 dnp->n_cookieverf.nfsuquad[1] = *tl; 2593 } else { 2594 m_freem(mrep); 2595 goto nfsmout; 2596 } 2597 } 2598 #endif 2599 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2600 more_dirs = fxdr_unsigned(int, *tl); 2601 2602 /* loop thru the dir entries, doctoring them to 4bsd form */ 2603 while (more_dirs && bigenough) { 2604 #ifndef NFS_V2_ONLY 2605 if (v3) { 2606 nfsm_dissect(tl, u_int32_t *, 2607 3 * NFSX_UNSIGNED); 2608 fileno = fxdr_hyper(tl); 2609 len = fxdr_unsigned(int, *(tl + 2)); 2610 } else 2611 #endif 2612 { 2613 nfsm_dissect(tl, u_int32_t *, 2614 2 * NFSX_UNSIGNED); 2615 fileno = fxdr_unsigned(u_quad_t, *tl++); 2616 len = fxdr_unsigned(int, *tl); 2617 } 2618 if (len <= 0 || len > NFS_MAXNAMLEN) { 2619 error = EBADRPC; 2620 m_freem(mrep); 2621 goto nfsmout; 2622 } 2623 /* for cookie stashing */ 2624 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2625 left = NFS_DIRFRAGSIZ - blksiz; 2626 if (reclen > left) { 2627 memset(uiop->uio_iov->iov_base, 0, left); 2628 dp->d_reclen += left; 2629 UIO_ADVANCE(uiop, left); 2630 blksiz = 0; 2631 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2632 } 2633 if (reclen > uiop->uio_resid) 2634 bigenough = 0; 2635 if (bigenough) { 2636 int tlen; 2637 2638 dp = (struct dirent *)uiop->uio_iov->iov_base; 2639 dp->d_fileno = fileno; 2640 dp->d_namlen = len; 2641 dp->d_reclen = reclen; 2642 dp->d_type = DT_UNKNOWN; 2643 blksiz += reclen; 2644 if (blksiz == NFS_DIRFRAGSIZ) 2645 blksiz = 0; 2646 UIO_ADVANCE(uiop, DIRHDSIZ); 2647 nfsm_mtouio(uiop, len); 2648 tlen = reclen - (DIRHDSIZ + len); 2649 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2650 UIO_ADVANCE(uiop, tlen); 2651 } else 2652 nfsm_adv(nfsm_rndup(len)); 2653 #ifndef NFS_V2_ONLY 2654 if (v3) { 2655 nfsm_dissect(tl, u_int32_t *, 2656 3 * NFSX_UNSIGNED); 2657 } else 2658 #endif 2659 { 2660 nfsm_dissect(tl, u_int32_t *, 2661 2 * NFSX_UNSIGNED); 2662 } 2663 if (bigenough) { 2664 #ifndef NFS_V2_ONLY 2665 if (v3) { 2666 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2667 uiop->uio_offset = 2668 fxdr_swapcookie3(tl); 2669 else 2670 uiop->uio_offset = 2671 fxdr_cookie3(tl); 2672 } 2673 else 2674 #endif 2675 { 2676 uiop->uio_offset = 2677 fxdr_unsigned(off_t, *tl); 2678 } 2679 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2680 } 2681 if (v3) 2682 tl += 2; 2683 else 2684 tl++; 2685 more_dirs = fxdr_unsigned(int, *tl); 2686 } 2687 /* 2688 * If at end of rpc data, get the eof boolean 2689 */ 2690 if (!more_dirs) { 2691 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2692 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2693 2694 /* 2695 * kludge: if we got no entries, treat it as EOF. 2696 * some server sometimes send a reply without any 2697 * entries or EOF. 2698 * although it might mean the server has very long name, 2699 * we can't handle such entries anyway. 2700 */ 2701 2702 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2703 more_dirs = 0; 2704 } 2705 m_freem(mrep); 2706 } 2707 /* 2708 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2709 * by increasing d_reclen for the last record. 2710 */ 2711 if (blksiz > 0) { 2712 left = NFS_DIRFRAGSIZ - blksiz; 2713 memset(uiop->uio_iov->iov_base, 0, left); 2714 dp->d_reclen += left; 2715 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2716 UIO_ADVANCE(uiop, left); 2717 } 2718 2719 /* 2720 * We are now either at the end of the directory or have filled the 2721 * block. 2722 */ 2723 if (bigenough) { 2724 dnp->n_direofoffset = uiop->uio_offset; 2725 dnp->n_flag |= NEOFVALID; 2726 } 2727 nfsmout: 2728 return (error); 2729 } 2730 2731 #ifndef NFS_V2_ONLY 2732 /* 2733 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2734 */ 2735 int 2736 nfs_readdirplusrpc(vp, uiop, cred) 2737 struct vnode *vp; 2738 struct uio *uiop; 2739 kauth_cred_t cred; 2740 { 2741 int len, left; 2742 struct dirent *dp = NULL; 2743 u_int32_t *tl; 2744 char *cp; 2745 int32_t t1, t2; 2746 struct vnode *newvp; 2747 char *bpos, *dpos, *cp2; 2748 struct mbuf *mreq, *mrep, *md, *mb; 2749 struct nameidata nami, *ndp = &nami; 2750 struct componentname *cnp = &ndp->ni_cnd; 2751 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2752 struct nfsnode *dnp = VTONFS(vp), *np; 2753 nfsfh_t *fhp; 2754 u_quad_t fileno; 2755 int error = 0, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2756 int attrflag, fhsize, nrpcs = 0, reclen; 2757 struct nfs_fattr fattr, *fp; 2758 2759 #ifdef DIAGNOSTIC 2760 if (uiop->uio_iovcnt != 1 || uiop->uio_resid != NFS_DIRBLKSIZ) 2761 panic("nfs readdirplusrpc bad uio"); 2762 #endif 2763 ndp->ni_dvp = vp; 2764 newvp = NULLVP; 2765 2766 /* 2767 * Loop around doing readdir rpc's of size nm_readdirsize 2768 * truncated to a multiple of NFS_DIRFRAGSIZ. 2769 * The stopping criteria is EOF or buffer full. 2770 */ 2771 while (more_dirs && bigenough) { 2772 if (nrpcs > 0 && uiop->uio_resid < (nmp->nm_readdirsize / 2)) { 2773 bigenough = 0; 2774 break; 2775 } 2776 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2777 nfsm_reqhead(dnp, NFSPROC_READDIRPLUS, 2778 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2779 nfsm_fhtom(dnp, 1); 2780 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2781 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) { 2782 txdr_swapcookie3(uiop->uio_offset, tl); 2783 } else { 2784 txdr_cookie3(uiop->uio_offset, tl); 2785 } 2786 tl += 2; 2787 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2788 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2789 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2790 *tl = txdr_unsigned(nmp->nm_rsize); 2791 nfsm_request(dnp, NFSPROC_READDIRPLUS, curlwp, cred); 2792 nfsm_postop_attr(vp, attrflag, 0); 2793 if (error) { 2794 m_freem(mrep); 2795 goto nfsmout; 2796 } 2797 nrpcs++; 2798 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2799 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2800 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2801 more_dirs = fxdr_unsigned(int, *tl); 2802 2803 /* loop thru the dir entries, doctoring them to 4bsd form */ 2804 while (more_dirs && bigenough) { 2805 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2806 fileno = fxdr_hyper(tl); 2807 len = fxdr_unsigned(int, *(tl + 2)); 2808 if (len <= 0 || len > NFS_MAXNAMLEN) { 2809 error = EBADRPC; 2810 m_freem(mrep); 2811 goto nfsmout; 2812 } 2813 /* for cookie stashing */ 2814 reclen = _DIRENT_RECLEN(dp, len) + 2 * sizeof(off_t); 2815 left = NFS_DIRFRAGSIZ - blksiz; 2816 if (reclen > left) { 2817 /* 2818 * DIRFRAGSIZ is aligned, no need to align 2819 * again here. 2820 */ 2821 memset(uiop->uio_iov->iov_base, 0, left); 2822 dp->d_reclen += left; 2823 UIO_ADVANCE(uiop, left); 2824 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2825 blksiz = 0; 2826 } 2827 if (reclen > uiop->uio_resid) 2828 bigenough = 0; 2829 if (bigenough) { 2830 int tlen; 2831 2832 dp = (struct dirent *)uiop->uio_iov->iov_base; 2833 dp->d_fileno = fileno; 2834 dp->d_namlen = len; 2835 dp->d_reclen = reclen; 2836 dp->d_type = DT_UNKNOWN; 2837 blksiz += reclen; 2838 if (blksiz == NFS_DIRFRAGSIZ) 2839 blksiz = 0; 2840 UIO_ADVANCE(uiop, DIRHDSIZ); 2841 nfsm_mtouio(uiop, len); 2842 tlen = reclen - (DIRHDSIZ + len); 2843 (void)memset(uiop->uio_iov->iov_base, 0, tlen); 2844 UIO_ADVANCE(uiop, tlen); 2845 cnp->cn_nameptr = dp->d_name; 2846 cnp->cn_namelen = dp->d_namlen; 2847 } else 2848 nfsm_adv(nfsm_rndup(len)); 2849 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2850 if (bigenough) { 2851 if (nmp->nm_iflag & NFSMNT_SWAPCOOKIE) 2852 uiop->uio_offset = 2853 fxdr_swapcookie3(tl); 2854 else 2855 uiop->uio_offset = 2856 fxdr_cookie3(tl); 2857 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2858 } 2859 tl += 2; 2860 2861 /* 2862 * Since the attributes are before the file handle 2863 * (sigh), we must skip over the attributes and then 2864 * come back and get them. 2865 */ 2866 attrflag = fxdr_unsigned(int, *tl); 2867 if (attrflag) { 2868 nfsm_dissect(fp, struct nfs_fattr *, NFSX_V3FATTR); 2869 memcpy(&fattr, fp, NFSX_V3FATTR); 2870 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2871 doit = fxdr_unsigned(int, *tl); 2872 if (doit) { 2873 nfsm_getfh(fhp, fhsize, 1); 2874 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2875 VREF(vp); 2876 newvp = vp; 2877 np = dnp; 2878 } else { 2879 error = nfs_nget1(vp->v_mount, fhp, 2880 fhsize, &np, LK_NOWAIT); 2881 if (!error) 2882 newvp = NFSTOV(np); 2883 } 2884 if (!error) { 2885 const char *xcp; 2886 2887 nfs_loadattrcache(&newvp, &fattr, 0, 0); 2888 if (bigenough) { 2889 dp->d_type = 2890 IFTODT(VTTOIF(np->n_vattr->va_type)); 2891 if (cnp->cn_namelen <= NCHNAMLEN) { 2892 ndp->ni_vp = newvp; 2893 xcp = cnp->cn_nameptr + 2894 cnp->cn_namelen; 2895 cnp->cn_hash = 2896 namei_hash(cnp->cn_nameptr, &xcp); 2897 nfs_cache_enter(ndp->ni_dvp, 2898 ndp->ni_vp, cnp); 2899 } 2900 } 2901 } 2902 error = 0; 2903 } 2904 } else { 2905 /* Just skip over the file handle */ 2906 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2907 i = fxdr_unsigned(int, *tl); 2908 nfsm_adv(nfsm_rndup(i)); 2909 } 2910 if (newvp != NULLVP) { 2911 if (newvp == vp) 2912 vrele(newvp); 2913 else 2914 vput(newvp); 2915 newvp = NULLVP; 2916 } 2917 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2918 more_dirs = fxdr_unsigned(int, *tl); 2919 } 2920 /* 2921 * If at end of rpc data, get the eof boolean 2922 */ 2923 if (!more_dirs) { 2924 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2925 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2926 2927 /* 2928 * kludge: see a comment in nfs_readdirrpc. 2929 */ 2930 2931 if (uiop->uio_resid >= NFS_DIRBLKSIZ) 2932 more_dirs = 0; 2933 } 2934 m_freem(mrep); 2935 } 2936 /* 2937 * Fill last record, iff any, out to a multiple of NFS_DIRFRAGSIZ 2938 * by increasing d_reclen for the last record. 2939 */ 2940 if (blksiz > 0) { 2941 left = NFS_DIRFRAGSIZ - blksiz; 2942 memset(uiop->uio_iov->iov_base, 0, left); 2943 dp->d_reclen += left; 2944 NFS_STASHCOOKIE(dp, uiop->uio_offset); 2945 UIO_ADVANCE(uiop, left); 2946 } 2947 2948 /* 2949 * We are now either at the end of the directory or have filled the 2950 * block. 2951 */ 2952 if (bigenough) { 2953 dnp->n_direofoffset = uiop->uio_offset; 2954 dnp->n_flag |= NEOFVALID; 2955 } 2956 nfsmout: 2957 if (newvp != NULLVP) { 2958 if(newvp == vp) 2959 vrele(newvp); 2960 else 2961 vput(newvp); 2962 } 2963 return (error); 2964 } 2965 #endif 2966 2967 /* 2968 * Silly rename. To make the NFS filesystem that is stateless look a little 2969 * more like the "ufs" a remove of an active vnode is translated to a rename 2970 * to a funny looking filename that is removed by nfs_inactive on the 2971 * nfsnode. There is the potential for another process on a different client 2972 * to create the same funny name between the nfs_lookitup() fails and the 2973 * nfs_rename() completes, but... 2974 */ 2975 int 2976 nfs_sillyrename(dvp, vp, cnp, dolink) 2977 struct vnode *dvp, *vp; 2978 struct componentname *cnp; 2979 bool dolink; 2980 { 2981 struct sillyrename *sp; 2982 struct nfsnode *np; 2983 int error; 2984 short pid; 2985 2986 cache_purge(dvp); 2987 np = VTONFS(vp); 2988 #ifndef DIAGNOSTIC 2989 if (vp->v_type == VDIR) 2990 panic("nfs: sillyrename dir"); 2991 #endif 2992 sp = kmem_alloc(sizeof(*sp), KM_SLEEP); 2993 sp->s_cred = kauth_cred_dup(cnp->cn_cred); 2994 sp->s_dvp = dvp; 2995 VREF(dvp); 2996 2997 /* Fudge together a funny name */ 2998 pid = curlwp->l_proc->p_pid; 2999 memcpy(sp->s_name, ".nfsAxxxx4.4", 13); 3000 sp->s_namlen = 12; 3001 sp->s_name[8] = hexdigits[pid & 0xf]; 3002 sp->s_name[7] = hexdigits[(pid >> 4) & 0xf]; 3003 sp->s_name[6] = hexdigits[(pid >> 8) & 0xf]; 3004 sp->s_name[5] = hexdigits[(pid >> 12) & 0xf]; 3005 3006 /* Try lookitups until we get one that isn't there */ 3007 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3008 curlwp, (struct nfsnode **)0) == 0) { 3009 sp->s_name[4]++; 3010 if (sp->s_name[4] > 'z') { 3011 error = EINVAL; 3012 goto bad; 3013 } 3014 } 3015 if (dolink) { 3016 error = nfs_linkrpc(dvp, vp, sp->s_name, sp->s_namlen, 3017 sp->s_cred, curlwp); 3018 /* 3019 * nfs_request maps NFSERR_NOTSUPP to ENOTSUP. 3020 */ 3021 if (error == ENOTSUP) { 3022 error = nfs_renameit(dvp, cnp, sp); 3023 } 3024 } else { 3025 error = nfs_renameit(dvp, cnp, sp); 3026 } 3027 if (error) 3028 goto bad; 3029 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3030 curlwp, &np); 3031 np->n_sillyrename = sp; 3032 return (0); 3033 bad: 3034 vrele(sp->s_dvp); 3035 kauth_cred_free(sp->s_cred); 3036 kmem_free(sp, sizeof(*sp)); 3037 return (error); 3038 } 3039 3040 /* 3041 * Look up a file name and optionally either update the file handle or 3042 * allocate an nfsnode, depending on the value of npp. 3043 * npp == NULL --> just do the lookup 3044 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 3045 * handled too 3046 * *npp != NULL --> update the file handle in the vnode 3047 */ 3048 int 3049 nfs_lookitup(dvp, name, len, cred, l, npp) 3050 struct vnode *dvp; 3051 const char *name; 3052 int len; 3053 kauth_cred_t cred; 3054 struct lwp *l; 3055 struct nfsnode **npp; 3056 { 3057 u_int32_t *tl; 3058 char *cp; 3059 int32_t t1, t2; 3060 struct vnode *newvp = (struct vnode *)0; 3061 struct nfsnode *np, *dnp = VTONFS(dvp); 3062 char *bpos, *dpos, *cp2; 3063 int error = 0, fhlen; 3064 #ifndef NFS_V2_ONLY 3065 int attrflag; 3066 #endif 3067 struct mbuf *mreq, *mrep, *md, *mb; 3068 nfsfh_t *nfhp; 3069 const int v3 = NFS_ISV3(dvp); 3070 3071 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 3072 nfsm_reqhead(dnp, NFSPROC_LOOKUP, 3073 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 3074 nfsm_fhtom(dnp, v3); 3075 nfsm_strtom(name, len, NFS_MAXNAMLEN); 3076 nfsm_request(dnp, NFSPROC_LOOKUP, l, cred); 3077 if (npp && !error) { 3078 nfsm_getfh(nfhp, fhlen, v3); 3079 if (*npp) { 3080 np = *npp; 3081 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 3082 kmem_free(np->n_fhp, np->n_fhsize); 3083 np->n_fhp = &np->n_fh; 3084 } 3085 #if NFS_SMALLFH < NFSX_V3FHMAX 3086 else if (np->n_fhsize <= NFS_SMALLFH && fhlen > NFS_SMALLFH) 3087 np->n_fhp = kmem_alloc(fhlen, KM_SLEEP); 3088 #endif 3089 memcpy(np->n_fhp, nfhp, fhlen); 3090 np->n_fhsize = fhlen; 3091 newvp = NFSTOV(np); 3092 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 3093 VREF(dvp); 3094 newvp = dvp; 3095 np = dnp; 3096 } else { 3097 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 3098 if (error) { 3099 m_freem(mrep); 3100 return (error); 3101 } 3102 newvp = NFSTOV(np); 3103 } 3104 #ifndef NFS_V2_ONLY 3105 if (v3) { 3106 nfsm_postop_attr(newvp, attrflag, 0); 3107 if (!attrflag && *npp == NULL) { 3108 m_freem(mrep); 3109 vput(newvp); 3110 return (ENOENT); 3111 } 3112 } else 3113 #endif 3114 nfsm_loadattr(newvp, (struct vattr *)0, 0); 3115 } 3116 nfsm_reqdone; 3117 if (npp && *npp == NULL) { 3118 if (error) { 3119 if (newvp) 3120 vput(newvp); 3121 } else 3122 *npp = np; 3123 } 3124 return (error); 3125 } 3126 3127 #ifndef NFS_V2_ONLY 3128 /* 3129 * Nfs Version 3 commit rpc 3130 */ 3131 int 3132 nfs_commit(vp, offset, cnt, l) 3133 struct vnode *vp; 3134 off_t offset; 3135 uint32_t cnt; 3136 struct lwp *l; 3137 { 3138 char *cp; 3139 u_int32_t *tl; 3140 int32_t t1, t2; 3141 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3142 char *bpos, *dpos, *cp2; 3143 int error = 0, wccflag = NFSV3_WCCRATTR; 3144 struct mbuf *mreq, *mrep, *md, *mb; 3145 struct nfsnode *np; 3146 3147 KASSERT(NFS_ISV3(vp)); 3148 3149 #ifdef NFS_DEBUG_COMMIT 3150 printf("commit %lu - %lu\n", (unsigned long)offset, 3151 (unsigned long)(offset + cnt)); 3152 #endif 3153 3154 mutex_enter(&nmp->nm_lock); 3155 if ((nmp->nm_iflag & NFSMNT_HASWRITEVERF) == 0) { 3156 mutex_exit(&nmp->nm_lock); 3157 return (0); 3158 } 3159 mutex_exit(&nmp->nm_lock); 3160 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3161 np = VTONFS(vp); 3162 nfsm_reqhead(np, NFSPROC_COMMIT, NFSX_FH(1)); 3163 nfsm_fhtom(np, 1); 3164 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 3165 txdr_hyper(offset, tl); 3166 tl += 2; 3167 *tl = txdr_unsigned(cnt); 3168 nfsm_request(np, NFSPROC_COMMIT, l, np->n_wcred); 3169 nfsm_wcc_data(vp, wccflag, NAC_NOTRUNC, false); 3170 if (!error) { 3171 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 3172 mutex_enter(&nmp->nm_lock); 3173 if ((nmp->nm_iflag & NFSMNT_STALEWRITEVERF) || 3174 memcmp(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF)) { 3175 memcpy(nmp->nm_writeverf, tl, NFSX_V3WRITEVERF); 3176 error = NFSERR_STALEWRITEVERF; 3177 nmp->nm_iflag |= NFSMNT_STALEWRITEVERF; 3178 } 3179 mutex_exit(&nmp->nm_lock); 3180 } 3181 nfsm_reqdone; 3182 return (error); 3183 } 3184 #endif 3185 3186 /* 3187 * Kludge City.. 3188 * - make nfs_bmap() essentially a no-op that does no translation 3189 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3190 * (Maybe I could use the process's page mapping, but I was concerned that 3191 * Kernel Write might not be enabled and also figured copyout() would do 3192 * a lot more work than memcpy() and also it currently happens in the 3193 * context of the swapper process (2). 3194 */ 3195 int 3196 nfs_bmap(v) 3197 void *v; 3198 { 3199 struct vop_bmap_args /* { 3200 struct vnode *a_vp; 3201 daddr_t a_bn; 3202 struct vnode **a_vpp; 3203 daddr_t *a_bnp; 3204 int *a_runp; 3205 } */ *ap = v; 3206 struct vnode *vp = ap->a_vp; 3207 int bshift = vp->v_mount->mnt_fs_bshift - vp->v_mount->mnt_dev_bshift; 3208 3209 if (ap->a_vpp != NULL) 3210 *ap->a_vpp = vp; 3211 if (ap->a_bnp != NULL) 3212 *ap->a_bnp = ap->a_bn << bshift; 3213 if (ap->a_runp != NULL) 3214 *ap->a_runp = 1024 * 1024; /* XXX */ 3215 return (0); 3216 } 3217 3218 /* 3219 * Strategy routine. 3220 * For async requests when nfsiod(s) are running, queue the request by 3221 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 3222 * request. 3223 */ 3224 int 3225 nfs_strategy(v) 3226 void *v; 3227 { 3228 struct vop_strategy_args *ap = v; 3229 struct buf *bp = ap->a_bp; 3230 int error = 0; 3231 3232 if ((bp->b_flags & (B_PHYS|B_ASYNC)) == (B_PHYS|B_ASYNC)) 3233 panic("nfs physio/async"); 3234 3235 /* 3236 * If the op is asynchronous and an i/o daemon is waiting 3237 * queue the request, wake it up and wait for completion 3238 * otherwise just do it ourselves. 3239 */ 3240 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(bp)) 3241 error = nfs_doio(bp); 3242 return (error); 3243 } 3244 3245 /* 3246 * fsync vnode op. Just call nfs_flush() with commit == 1. 3247 */ 3248 /* ARGSUSED */ 3249 int 3250 nfs_fsync(v) 3251 void *v; 3252 { 3253 struct vop_fsync_args /* { 3254 struct vnodeop_desc *a_desc; 3255 struct vnode * a_vp; 3256 kauth_cred_t a_cred; 3257 int a_flags; 3258 off_t offlo; 3259 off_t offhi; 3260 struct lwp * a_l; 3261 } */ *ap = v; 3262 3263 struct vnode *vp = ap->a_vp; 3264 3265 if (vp->v_type != VREG) 3266 return 0; 3267 3268 return (nfs_flush(vp, ap->a_cred, 3269 (ap->a_flags & FSYNC_WAIT) != 0 ? MNT_WAIT : 0, curlwp, 1)); 3270 } 3271 3272 /* 3273 * Flush all the data associated with a vnode. 3274 */ 3275 int 3276 nfs_flush(struct vnode *vp, kauth_cred_t cred, int waitfor, struct lwp *l, 3277 int commit) 3278 { 3279 struct nfsnode *np = VTONFS(vp); 3280 int error; 3281 int flushflags = PGO_ALLPAGES|PGO_CLEANIT|PGO_SYNCIO; 3282 UVMHIST_FUNC("nfs_flush"); UVMHIST_CALLED(ubchist); 3283 3284 mutex_enter(&vp->v_interlock); 3285 error = VOP_PUTPAGES(vp, 0, 0, flushflags); 3286 if (np->n_flag & NWRITEERR) { 3287 error = np->n_error; 3288 np->n_flag &= ~NWRITEERR; 3289 } 3290 UVMHIST_LOG(ubchist, "returning %d", error,0,0,0); 3291 return (error); 3292 } 3293 3294 /* 3295 * Return POSIX pathconf information applicable to nfs. 3296 * 3297 * N.B. The NFS V2 protocol doesn't support this RPC. 3298 */ 3299 /* ARGSUSED */ 3300 int 3301 nfs_pathconf(v) 3302 void *v; 3303 { 3304 struct vop_pathconf_args /* { 3305 struct vnode *a_vp; 3306 int a_name; 3307 register_t *a_retval; 3308 } */ *ap = v; 3309 struct nfsv3_pathconf *pcp; 3310 struct vnode *vp = ap->a_vp; 3311 struct mbuf *mreq, *mrep, *md, *mb; 3312 int32_t t1, t2; 3313 u_int32_t *tl; 3314 char *bpos, *dpos, *cp, *cp2; 3315 int error = 0, attrflag; 3316 #ifndef NFS_V2_ONLY 3317 struct nfsmount *nmp; 3318 unsigned int l; 3319 u_int64_t maxsize; 3320 #endif 3321 const int v3 = NFS_ISV3(vp); 3322 struct nfsnode *np = VTONFS(vp); 3323 3324 switch (ap->a_name) { 3325 /* Names that can be resolved locally. */ 3326 case _PC_PIPE_BUF: 3327 *ap->a_retval = PIPE_BUF; 3328 break; 3329 case _PC_SYNC_IO: 3330 *ap->a_retval = 1; 3331 break; 3332 /* Names that cannot be resolved locally; do an RPC, if possible. */ 3333 case _PC_LINK_MAX: 3334 case _PC_NAME_MAX: 3335 case _PC_CHOWN_RESTRICTED: 3336 case _PC_NO_TRUNC: 3337 if (!v3) { 3338 error = EINVAL; 3339 break; 3340 } 3341 nfsstats.rpccnt[NFSPROC_PATHCONF]++; 3342 nfsm_reqhead(np, NFSPROC_PATHCONF, NFSX_FH(1)); 3343 nfsm_fhtom(np, 1); 3344 nfsm_request(np, NFSPROC_PATHCONF, 3345 curlwp, curlwp->l_cred); /* XXX */ 3346 nfsm_postop_attr(vp, attrflag, 0); 3347 if (!error) { 3348 nfsm_dissect(pcp, struct nfsv3_pathconf *, 3349 NFSX_V3PATHCONF); 3350 switch (ap->a_name) { 3351 case _PC_LINK_MAX: 3352 *ap->a_retval = 3353 fxdr_unsigned(register_t, pcp->pc_linkmax); 3354 break; 3355 case _PC_NAME_MAX: 3356 *ap->a_retval = 3357 fxdr_unsigned(register_t, pcp->pc_namemax); 3358 break; 3359 case _PC_CHOWN_RESTRICTED: 3360 *ap->a_retval = 3361 (pcp->pc_chownrestricted == nfs_true); 3362 break; 3363 case _PC_NO_TRUNC: 3364 *ap->a_retval = 3365 (pcp->pc_notrunc == nfs_true); 3366 break; 3367 } 3368 } 3369 nfsm_reqdone; 3370 break; 3371 case _PC_FILESIZEBITS: 3372 #ifndef NFS_V2_ONLY 3373 if (v3) { 3374 nmp = VFSTONFS(vp->v_mount); 3375 if ((nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 3376 if ((error = nfs_fsinfo(nmp, vp, 3377 curlwp->l_cred, curlwp)) != 0) /* XXX */ 3378 break; 3379 for (l = 0, maxsize = nmp->nm_maxfilesize; 3380 (maxsize >> l) > 0; l++) 3381 ; 3382 *ap->a_retval = l + 1; 3383 } else 3384 #endif 3385 { 3386 *ap->a_retval = 32; /* NFS V2 limitation */ 3387 } 3388 break; 3389 default: 3390 error = EINVAL; 3391 break; 3392 } 3393 3394 return (error); 3395 } 3396 3397 /* 3398 * NFS advisory byte-level locks. 3399 */ 3400 int 3401 nfs_advlock(v) 3402 void *v; 3403 { 3404 struct vop_advlock_args /* { 3405 struct vnode *a_vp; 3406 void *a_id; 3407 int a_op; 3408 struct flock *a_fl; 3409 int a_flags; 3410 } */ *ap = v; 3411 struct nfsnode *np = VTONFS(ap->a_vp); 3412 3413 return lf_advlock(ap, &np->n_lockf, np->n_size); 3414 } 3415 3416 /* 3417 * Print out the contents of an nfsnode. 3418 */ 3419 int 3420 nfs_print(v) 3421 void *v; 3422 { 3423 struct vop_print_args /* { 3424 struct vnode *a_vp; 3425 } */ *ap = v; 3426 struct vnode *vp = ap->a_vp; 3427 struct nfsnode *np = VTONFS(vp); 3428 3429 printf("tag VT_NFS, fileid %lld fsid 0x%lx", 3430 (unsigned long long)np->n_vattr->va_fileid, np->n_vattr->va_fsid); 3431 if (vp->v_type == VFIFO) 3432 fifo_printinfo(vp); 3433 printf("\n"); 3434 return (0); 3435 } 3436 3437 /* 3438 * nfs unlock wrapper. 3439 */ 3440 int 3441 nfs_unlock(void *v) 3442 { 3443 struct vop_unlock_args /* { 3444 struct vnode *a_vp; 3445 int a_flags; 3446 } */ *ap = v; 3447 struct vnode *vp = ap->a_vp; 3448 3449 /* 3450 * VOP_UNLOCK can be called by nfs_loadattrcache 3451 * with v_data == 0. 3452 */ 3453 if (VTONFS(vp)) { 3454 nfs_delayedtruncate(vp); 3455 } 3456 3457 return genfs_unlock(v); 3458 } 3459 3460 /* 3461 * nfs special file access vnode op. 3462 * Essentially just get vattr and then imitate iaccess() since the device is 3463 * local to the client. 3464 */ 3465 int 3466 nfsspec_access(v) 3467 void *v; 3468 { 3469 struct vop_access_args /* { 3470 struct vnode *a_vp; 3471 int a_mode; 3472 kauth_cred_t a_cred; 3473 struct lwp *a_l; 3474 } */ *ap = v; 3475 struct vattr va; 3476 struct vnode *vp = ap->a_vp; 3477 int error; 3478 3479 error = VOP_GETATTR(vp, &va, ap->a_cred); 3480 if (error) 3481 return (error); 3482 3483 /* 3484 * Disallow write attempts on filesystems mounted read-only; 3485 * unless the file is a socket, fifo, or a block or character 3486 * device resident on the filesystem. 3487 */ 3488 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3489 switch (vp->v_type) { 3490 case VREG: 3491 case VDIR: 3492 case VLNK: 3493 return (EROFS); 3494 default: 3495 break; 3496 } 3497 } 3498 3499 return (vaccess(va.va_type, va.va_mode, 3500 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred)); 3501 } 3502 3503 /* 3504 * Read wrapper for special devices. 3505 */ 3506 int 3507 nfsspec_read(v) 3508 void *v; 3509 { 3510 struct vop_read_args /* { 3511 struct vnode *a_vp; 3512 struct uio *a_uio; 3513 int a_ioflag; 3514 kauth_cred_t a_cred; 3515 } */ *ap = v; 3516 struct nfsnode *np = VTONFS(ap->a_vp); 3517 3518 /* 3519 * Set access flag. 3520 */ 3521 np->n_flag |= NACC; 3522 getnanotime(&np->n_atim); 3523 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3524 } 3525 3526 /* 3527 * Write wrapper for special devices. 3528 */ 3529 int 3530 nfsspec_write(v) 3531 void *v; 3532 { 3533 struct vop_write_args /* { 3534 struct vnode *a_vp; 3535 struct uio *a_uio; 3536 int a_ioflag; 3537 kauth_cred_t a_cred; 3538 } */ *ap = v; 3539 struct nfsnode *np = VTONFS(ap->a_vp); 3540 3541 /* 3542 * Set update flag. 3543 */ 3544 np->n_flag |= NUPD; 3545 getnanotime(&np->n_mtim); 3546 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3547 } 3548 3549 /* 3550 * Close wrapper for special devices. 3551 * 3552 * Update the times on the nfsnode then do device close. 3553 */ 3554 int 3555 nfsspec_close(v) 3556 void *v; 3557 { 3558 struct vop_close_args /* { 3559 struct vnode *a_vp; 3560 int a_fflag; 3561 kauth_cred_t a_cred; 3562 struct lwp *a_l; 3563 } */ *ap = v; 3564 struct vnode *vp = ap->a_vp; 3565 struct nfsnode *np = VTONFS(vp); 3566 struct vattr vattr; 3567 3568 if (np->n_flag & (NACC | NUPD)) { 3569 np->n_flag |= NCHG; 3570 if (vp->v_usecount == 1 && 3571 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3572 VATTR_NULL(&vattr); 3573 if (np->n_flag & NACC) 3574 vattr.va_atime = np->n_atim; 3575 if (np->n_flag & NUPD) 3576 vattr.va_mtime = np->n_mtim; 3577 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3578 } 3579 } 3580 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3581 } 3582 3583 /* 3584 * Read wrapper for fifos. 3585 */ 3586 int 3587 nfsfifo_read(v) 3588 void *v; 3589 { 3590 struct vop_read_args /* { 3591 struct vnode *a_vp; 3592 struct uio *a_uio; 3593 int a_ioflag; 3594 kauth_cred_t a_cred; 3595 } */ *ap = v; 3596 struct nfsnode *np = VTONFS(ap->a_vp); 3597 3598 /* 3599 * Set access flag. 3600 */ 3601 np->n_flag |= NACC; 3602 getnanotime(&np->n_atim); 3603 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3604 } 3605 3606 /* 3607 * Write wrapper for fifos. 3608 */ 3609 int 3610 nfsfifo_write(v) 3611 void *v; 3612 { 3613 struct vop_write_args /* { 3614 struct vnode *a_vp; 3615 struct uio *a_uio; 3616 int a_ioflag; 3617 kauth_cred_t a_cred; 3618 } */ *ap = v; 3619 struct nfsnode *np = VTONFS(ap->a_vp); 3620 3621 /* 3622 * Set update flag. 3623 */ 3624 np->n_flag |= NUPD; 3625 getnanotime(&np->n_mtim); 3626 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3627 } 3628 3629 /* 3630 * Close wrapper for fifos. 3631 * 3632 * Update the times on the nfsnode then do fifo close. 3633 */ 3634 int 3635 nfsfifo_close(v) 3636 void *v; 3637 { 3638 struct vop_close_args /* { 3639 struct vnode *a_vp; 3640 int a_fflag; 3641 kauth_cred_t a_cred; 3642 struct lwp *a_l; 3643 } */ *ap = v; 3644 struct vnode *vp = ap->a_vp; 3645 struct nfsnode *np = VTONFS(vp); 3646 struct vattr vattr; 3647 3648 if (np->n_flag & (NACC | NUPD)) { 3649 struct timespec ts; 3650 3651 getnanotime(&ts); 3652 if (np->n_flag & NACC) 3653 np->n_atim = ts; 3654 if (np->n_flag & NUPD) 3655 np->n_mtim = ts; 3656 np->n_flag |= NCHG; 3657 if (vp->v_usecount == 1 && 3658 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3659 VATTR_NULL(&vattr); 3660 if (np->n_flag & NACC) 3661 vattr.va_atime = np->n_atim; 3662 if (np->n_flag & NUPD) 3663 vattr.va_mtime = np->n_mtim; 3664 (void)VOP_SETATTR(vp, &vattr, ap->a_cred); 3665 } 3666 } 3667 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3668 } 3669
Indexes created Wed Oct 15 07:09:58 GMT 2025