1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 33 * $FreeBSD: src/sys/nfs/nfs_vnops.c,v 1.150.2.5 2001/12/20 19:56:28 dillon Exp $ 34 */ 35 36 37 /* 38 * vnode op calls for Sun NFS version 2 and 3 39 */ 40 41 #include "opt_inet.h" 42 43 #include <sys/param.h> 44 #include <sys/kernel.h> 45 #include <sys/systm.h> 46 #include <sys/uio.h> 47 #include <sys/resourcevar.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/buf.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/namei.h> 54 #include <sys/nlookup.h> 55 #include <sys/socket.h> 56 #include <sys/vnode.h> 57 #include <sys/dirent.h> 58 #include <sys/fcntl.h> 59 #include <sys/lockf.h> 60 #include <sys/stat.h> 61 #include <sys/sysctl.h> 62 #include <sys/conf.h> 63 64 #include <vm/vm.h> 65 #include <vm/vm_extern.h> 66 67 #include <sys/buf2.h> 68 69 #include <vfs/fifofs/fifo.h> 70 #include <vfs/ufs/dir.h> 71 72 #undef DIRBLKSIZ 73 74 #include "rpcv2.h" 75 #include "nfsproto.h" 76 #include "nfs.h" 77 #include "nfsmount.h" 78 #include "nfsnode.h" 79 #include "xdr_subs.h" 80 #include "nfsm_subs.h" 81 82 #include <net/if.h> 83 #include <netinet/in.h> 84 #include <netinet/in_var.h> 85 86 /* Defs */ 87 #define TRUE 1 88 #define FALSE 0 89 90 static int nfsfifo_read (struct vop_read_args *); 91 static int nfsfifo_write (struct vop_write_args *); 92 static int nfsfifo_close (struct vop_close_args *); 93 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 94 static int nfs_lookup (struct vop_old_lookup_args *); 95 static int nfs_create (struct vop_old_create_args *); 96 static int nfs_mknod (struct vop_old_mknod_args *); 97 static int nfs_open (struct vop_open_args *); 98 static int nfs_close (struct vop_close_args *); 99 static int nfs_access (struct vop_access_args *); 100 static int nfs_getattr (struct vop_getattr_args *); 101 static int nfs_setattr (struct vop_setattr_args *); 102 static int nfs_read (struct vop_read_args *); 103 static int nfs_fsync (struct vop_fsync_args *); 104 static int nfs_remove (struct vop_old_remove_args *); 105 static int nfs_link (struct vop_old_link_args *); 106 static int nfs_rename (struct vop_old_rename_args *); 107 static int nfs_mkdir (struct vop_old_mkdir_args *); 108 static int nfs_rmdir (struct vop_old_rmdir_args *); 109 static int nfs_symlink (struct vop_old_symlink_args *); 110 static int nfs_readdir (struct vop_readdir_args *); 111 static int nfs_bmap (struct vop_bmap_args *); 112 static int nfs_strategy (struct vop_strategy_args *); 113 static int nfs_lookitup (struct vnode *, const char *, int, 114 struct ucred *, struct thread *, struct nfsnode **); 115 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 116 static int nfs_laccess (struct vop_access_args *); 117 static int nfs_readlink (struct vop_readlink_args *); 118 static int nfs_print (struct vop_print_args *); 119 static int nfs_advlock (struct vop_advlock_args *); 120 static int nfs_kqfilter (struct vop_kqfilter_args *ap); 121 122 static int nfs_nresolve (struct vop_nresolve_args *); 123 /* 124 * Global vfs data structures for nfs 125 */ 126 struct vop_ops nfsv2_vnode_vops = { 127 .vop_default = vop_defaultop, 128 .vop_access = nfs_access, 129 .vop_advlock = nfs_advlock, 130 .vop_bmap = nfs_bmap, 131 .vop_close = nfs_close, 132 .vop_old_create = nfs_create, 133 .vop_fsync = nfs_fsync, 134 .vop_getattr = nfs_getattr, 135 .vop_getpages = vop_stdgetpages, 136 .vop_putpages = vop_stdputpages, 137 .vop_inactive = nfs_inactive, 138 .vop_old_link = nfs_link, 139 .vop_old_lookup = nfs_lookup, 140 .vop_old_mkdir = nfs_mkdir, 141 .vop_old_mknod = nfs_mknod, 142 .vop_open = nfs_open, 143 .vop_print = nfs_print, 144 .vop_read = nfs_read, 145 .vop_readdir = nfs_readdir, 146 .vop_readlink = nfs_readlink, 147 .vop_reclaim = nfs_reclaim, 148 .vop_old_remove = nfs_remove, 149 .vop_old_rename = nfs_rename, 150 .vop_old_rmdir = nfs_rmdir, 151 .vop_setattr = nfs_setattr, 152 .vop_strategy = nfs_strategy, 153 .vop_old_symlink = nfs_symlink, 154 .vop_write = nfs_write, 155 .vop_nresolve = nfs_nresolve, 156 .vop_kqfilter = nfs_kqfilter 157 }; 158 159 /* 160 * Special device vnode ops 161 */ 162 struct vop_ops nfsv2_spec_vops = { 163 .vop_default = vop_defaultop, 164 .vop_access = nfs_laccess, 165 .vop_close = nfs_close, 166 .vop_fsync = nfs_fsync, 167 .vop_getattr = nfs_getattr, 168 .vop_inactive = nfs_inactive, 169 .vop_print = nfs_print, 170 .vop_read = vop_stdnoread, 171 .vop_reclaim = nfs_reclaim, 172 .vop_setattr = nfs_setattr, 173 .vop_write = vop_stdnowrite 174 }; 175 176 struct vop_ops nfsv2_fifo_vops = { 177 .vop_default = fifo_vnoperate, 178 .vop_access = nfs_laccess, 179 .vop_close = nfsfifo_close, 180 .vop_fsync = nfs_fsync, 181 .vop_getattr = nfs_getattr, 182 .vop_inactive = nfs_inactive, 183 .vop_print = nfs_print, 184 .vop_read = nfsfifo_read, 185 .vop_reclaim = nfs_reclaim, 186 .vop_setattr = nfs_setattr, 187 .vop_write = nfsfifo_write 188 }; 189 190 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 191 struct componentname *cnp, 192 struct vattr *vap); 193 static int nfs_removerpc (struct vnode *dvp, const char *name, 194 int namelen, 195 struct ucred *cred, struct thread *td); 196 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 197 int fnamelen, struct vnode *tdvp, 198 const char *tnameptr, int tnamelen, 199 struct ucred *cred, struct thread *td); 200 static int nfs_renameit (struct vnode *sdvp, 201 struct componentname *scnp, 202 struct sillyrename *sp); 203 204 SYSCTL_DECL(_vfs_nfs); 205 206 static int nfs_flush_on_rename = 1; 207 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_rename, CTLFLAG_RW, 208 &nfs_flush_on_rename, 0, "flush fvp prior to rename"); 209 static int nfs_flush_on_hlink = 0; 210 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_hlink, CTLFLAG_RW, 211 &nfs_flush_on_hlink, 0, "flush fvp prior to hard link"); 212 213 static int nfsaccess_cache_timeout = NFS_DEFATTRTIMO; 214 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 215 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 216 217 static int nfsneg_cache_timeout = NFS_MINATTRTIMO; 218 SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, 219 &nfsneg_cache_timeout, 0, "NFS NEGATIVE NAMECACHE timeout"); 220 221 static int nfspos_cache_timeout = NFS_MINATTRTIMO; 222 SYSCTL_INT(_vfs_nfs, OID_AUTO, pos_cache_timeout, CTLFLAG_RW, 223 &nfspos_cache_timeout, 0, "NFS POSITIVE NAMECACHE timeout"); 224 225 static int nfsv3_commit_on_close = 0; 226 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 227 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 228 #if 0 229 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 230 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 231 232 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 233 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 234 #endif 235 236 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 237 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 238 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 239 240 static __inline 241 void 242 nfs_knote(struct vnode *vp, int flags) 243 { 244 if (flags) 245 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags); 246 } 247 248 /* 249 * Returns whether a name component is a degenerate '.' or '..'. 250 */ 251 static __inline 252 int 253 nlcdegenerate(struct nlcomponent *nlc) 254 { 255 if (nlc->nlc_namelen == 1 && nlc->nlc_nameptr[0] == '.') 256 return(1); 257 if (nlc->nlc_namelen == 2 && 258 nlc->nlc_nameptr[0] == '.' && nlc->nlc_nameptr[1] == '.') 259 return(1); 260 return(0); 261 } 262 263 static int 264 nfs3_access_otw(struct vnode *vp, int wmode, 265 struct thread *td, struct ucred *cred) 266 { 267 struct nfsnode *np = VTONFS(vp); 268 int attrflag; 269 int error = 0; 270 u_int32_t *tl; 271 u_int32_t rmode; 272 struct nfsm_info info; 273 274 info.mrep = NULL; 275 info.v3 = 1; 276 277 nfsstats.rpccnt[NFSPROC_ACCESS]++; 278 nfsm_reqhead(&info, vp, NFSPROC_ACCESS, 279 NFSX_FH(info.v3) + NFSX_UNSIGNED); 280 ERROROUT(nfsm_fhtom(&info, vp)); 281 tl = nfsm_build(&info, NFSX_UNSIGNED); 282 *tl = txdr_unsigned(wmode); 283 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_ACCESS, td, cred, &error)); 284 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, NFS_LATTR_NOSHRINK)); 285 if (error == 0) { 286 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 287 rmode = fxdr_unsigned(u_int32_t, *tl); 288 np->n_mode = rmode; 289 np->n_modeuid = cred->cr_uid; 290 np->n_modestamp = mycpu->gd_time_seconds; 291 } 292 m_freem(info.mrep); 293 info.mrep = NULL; 294 nfsmout: 295 return error; 296 } 297 298 /* 299 * nfs access vnode op. 300 * For nfs version 2, just return ok. File accesses may fail later. 301 * For nfs version 3, use the access rpc to check accessibility. If file modes 302 * are changed on the server, accesses might still fail later. 303 * 304 * nfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 305 */ 306 static int 307 nfs_access(struct vop_access_args *ap) 308 { 309 struct ucred *cred; 310 struct ucred *ncred; 311 struct ucred *ocred; 312 struct vnode *vp = ap->a_vp; 313 thread_t td = curthread; 314 int error = 0; 315 u_int32_t mode, wmode; 316 struct nfsnode *np = VTONFS(vp); 317 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 318 int v3 = NFS_ISV3(vp); 319 320 lwkt_gettoken(&nmp->nm_token); 321 322 /* 323 * Disallow write attempts on filesystems mounted read-only; 324 * unless the file is a socket, fifo, or a block or character 325 * device resident on the filesystem. 326 */ 327 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 328 switch (vp->v_type) { 329 case VREG: 330 case VDIR: 331 case VLNK: 332 lwkt_reltoken(&nmp->nm_token); 333 return (EROFS); 334 default: 335 break; 336 } 337 } 338 339 /* 340 * The NFS protocol passes only the effective uid/gid over the wire but 341 * we need to check access against real ids if AT_EACCESS not set. 342 * Handle this case by cloning the credentials and setting the 343 * effective ids to the real ones. 344 * 345 * The crdup() here can cause a lot of ucred structures to build-up 346 * (up to maxvnodes), so do our best to avoid it. 347 */ 348 if (ap->a_flags & AT_EACCESS) { 349 cred = crhold(ap->a_cred); 350 } else { 351 cred = ap->a_cred; 352 if (cred->cr_uid == cred->cr_ruid && 353 cred->cr_gid == cred->cr_rgid) { 354 cred = crhold(ap->a_cred); 355 } else { 356 cred = crdup(ap->a_cred); 357 cred->cr_uid = cred->cr_ruid; 358 cred->cr_gid = cred->cr_rgid; 359 } 360 } 361 362 /* 363 * For nfs v3, check to see if we have done this recently, and if 364 * so return our cached result instead of making an ACCESS call. 365 * If not, do an access rpc, otherwise you are stuck emulating 366 * ufs_access() locally using the vattr. This may not be correct, 367 * since the server may apply other access criteria such as 368 * client uid-->server uid mapping that we do not know about. 369 */ 370 if (v3) { 371 if (ap->a_mode & VREAD) 372 mode = NFSV3ACCESS_READ; 373 else 374 mode = 0; 375 if (vp->v_type != VDIR) { 376 if (ap->a_mode & VWRITE) 377 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 378 if (ap->a_mode & VEXEC) 379 mode |= NFSV3ACCESS_EXECUTE; 380 } else { 381 if (ap->a_mode & VWRITE) 382 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 383 NFSV3ACCESS_DELETE); 384 if (ap->a_mode & VEXEC) 385 mode |= NFSV3ACCESS_LOOKUP; 386 } 387 /* XXX safety belt, only make blanket request if caching */ 388 if (nfsaccess_cache_timeout > 0) { 389 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 390 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 391 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 392 } else { 393 wmode = mode; 394 } 395 396 /* 397 * Does our cached result allow us to give a definite yes to 398 * this request? 399 */ 400 if (np->n_modestamp && 401 (mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && 402 (cred->cr_uid == np->n_modeuid) && 403 ((np->n_mode & mode) == mode)) { 404 nfsstats.accesscache_hits++; 405 } else { 406 /* 407 * Either a no, or a don't know. Go to the wire. 408 */ 409 nfsstats.accesscache_misses++; 410 error = nfs3_access_otw(vp, wmode, td, cred); 411 if (!error) { 412 if ((np->n_mode & mode) != mode) { 413 error = EACCES; 414 } 415 } 416 } 417 } else { 418 if ((error = nfs_laccess(ap)) != 0) { 419 crfree(cred); 420 lwkt_reltoken(&nmp->nm_token); 421 return (error); 422 } 423 424 /* 425 * Attempt to prevent a mapped root from accessing a file 426 * which it shouldn't. We try to read a byte from the file 427 * if the user is root and the file is not zero length. 428 * After calling nfs_laccess, we should have the correct 429 * file size cached. 430 */ 431 if (cred->cr_uid == 0 && (ap->a_mode & VREAD) 432 && VTONFS(vp)->n_size > 0) { 433 struct iovec aiov; 434 struct uio auio; 435 char buf[1]; 436 437 aiov.iov_base = buf; 438 aiov.iov_len = 1; 439 auio.uio_iov = &aiov; 440 auio.uio_iovcnt = 1; 441 auio.uio_offset = 0; 442 auio.uio_resid = 1; 443 auio.uio_segflg = UIO_SYSSPACE; 444 auio.uio_rw = UIO_READ; 445 auio.uio_td = td; 446 447 if (vp->v_type == VREG) { 448 error = nfs_readrpc_uio(vp, &auio); 449 } else if (vp->v_type == VDIR) { 450 char* bp; 451 bp = kmalloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 452 aiov.iov_base = bp; 453 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 454 error = nfs_readdirrpc_uio(vp, &auio); 455 kfree(bp, M_TEMP); 456 } else if (vp->v_type == VLNK) { 457 error = nfs_readlinkrpc_uio(vp, &auio); 458 } else { 459 error = EACCES; 460 } 461 } 462 } 463 /* 464 * [re]record creds for reading and/or writing if access 465 * was granted. Assume the NFS server will grant read access 466 * for execute requests. 467 */ 468 if (error == 0) { 469 if ((ap->a_mode & (VREAD|VEXEC)) && 470 !nfs_crsame(cred, np->n_rucred)) { 471 ncred = nfs_crhold(cred); 472 ocred = np->n_rucred; 473 np->n_rucred = ncred; 474 if (ocred) 475 crfree(ocred); 476 } 477 if ((ap->a_mode & VWRITE) && 478 !nfs_crsame(cred, np->n_wucred)) { 479 ncred = nfs_crhold(cred); 480 ocred = np->n_wucred; 481 np->n_wucred = ncred; 482 if (ocred) 483 crfree(ocred); 484 } 485 } 486 lwkt_reltoken(&nmp->nm_token); 487 crfree(cred); 488 489 return(error); 490 } 491 492 /* 493 * nfs open vnode op 494 * Check to see if the type is ok 495 * and that deletion is not in progress. 496 * For paged in text files, you will need to flush the page cache 497 * if consistency is lost. 498 * 499 * nfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 500 * struct file *a_fp) 501 */ 502 /* ARGSUSED */ 503 static int 504 nfs_open(struct vop_open_args *ap) 505 { 506 struct vnode *vp = ap->a_vp; 507 struct nfsnode *np = VTONFS(vp); 508 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 509 struct vattr vattr; 510 struct ucred *ncred; 511 struct ucred *ocred; 512 int error; 513 514 lwkt_gettoken(&nmp->nm_token); 515 516 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 517 #ifdef DIAGNOSTIC 518 kprintf("open eacces vtyp=%d\n",vp->v_type); 519 #endif 520 lwkt_reltoken(&nmp->nm_token); 521 return (EOPNOTSUPP); 522 } 523 524 /* 525 * Save valid creds for reading and writing for later RPCs. 526 */ 527 if ((ap->a_mode & FREAD) && !nfs_crsame(ap->a_cred, np->n_rucred)) { 528 ncred = nfs_crhold(ap->a_cred); 529 ocred = np->n_rucred; 530 np->n_rucred = ncred; 531 if (ocred) 532 crfree(ocred); 533 } 534 if ((ap->a_mode & FWRITE) && !nfs_crsame(ap->a_cred, np->n_wucred)) { 535 ncred = nfs_crhold(ap->a_cred); 536 ocred = np->n_wucred; 537 np->n_wucred = ncred; 538 if (ocred) 539 crfree(ocred); 540 } 541 542 /* 543 * Clear the attribute cache only if opening with write access. It 544 * is unclear if we should do this at all here, but we certainly 545 * should not clear the cache unconditionally simply because a file 546 * is being opened. 547 */ 548 if (ap->a_mode & FWRITE) 549 np->n_attrstamp = 0; 550 551 /* 552 * For normal NFS, reconcile changes made locally verses 553 * changes made remotely. Note that VOP_GETATTR only goes 554 * to the wire if the cached attribute has timed out or been 555 * cleared. 556 * 557 * If local modifications have been made clear the attribute 558 * cache to force an attribute and modified time check. If 559 * GETATTR detects that the file has been changed by someone 560 * other then us it will set NRMODIFIED. 561 * 562 * If we are opening a directory and local changes have been 563 * made we have to invalidate the cache in order to ensure 564 * that we get the most up-to-date information from the 565 * server. XXX 566 */ 567 if (np->n_flag & NLMODIFIED) { 568 np->n_attrstamp = 0; 569 if (vp->v_type == VDIR) { 570 error = nfs_vinvalbuf(vp, V_SAVE, 1); 571 if (error == EINTR) { 572 lwkt_reltoken(&nmp->nm_token); 573 return (error); 574 } 575 nfs_invaldir(vp); 576 } 577 } 578 error = VOP_GETATTR(vp, &vattr); 579 if (error) { 580 lwkt_reltoken(&nmp->nm_token); 581 return (error); 582 } 583 if (np->n_flag & NRMODIFIED) { 584 if (vp->v_type == VDIR) 585 nfs_invaldir(vp); 586 error = nfs_vinvalbuf(vp, V_SAVE, 1); 587 if (error == EINTR) { 588 lwkt_reltoken(&nmp->nm_token); 589 return (error); 590 } 591 np->n_flag &= ~NRMODIFIED; 592 } 593 error = vop_stdopen(ap); 594 lwkt_reltoken(&nmp->nm_token); 595 596 return error; 597 } 598 599 /* 600 * nfs close vnode op 601 * What an NFS client should do upon close after writing is a debatable issue. 602 * Most NFS clients push delayed writes to the server upon close, basically for 603 * two reasons: 604 * 1 - So that any write errors may be reported back to the client process 605 * doing the close system call. By far the two most likely errors are 606 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 607 * 2 - To put a worst case upper bound on cache inconsistency between 608 * multiple clients for the file. 609 * There is also a consistency problem for Version 2 of the protocol w.r.t. 610 * not being able to tell if other clients are writing a file concurrently, 611 * since there is no way of knowing if the changed modify time in the reply 612 * is only due to the write for this client. 613 * (NFS Version 3 provides weak cache consistency data in the reply that 614 * should be sufficient to detect and handle this case.) 615 * 616 * The current code does the following: 617 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 618 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 619 * or commit them (this satisfies 1 and 2 except for the 620 * case where the server crashes after this close but 621 * before the commit RPC, which is felt to be "good 622 * enough". Changing the last argument to nfs_flush() to 623 * a 1 would force a commit operation, if it is felt a 624 * commit is necessary now. 625 * for NQNFS - do nothing now, since 2 is dealt with via leases and 626 * 1 should be dealt with via an fsync() system call for 627 * cases where write errors are important. 628 * 629 * nfs_close(struct vnode *a_vp, int a_fflag) 630 */ 631 /* ARGSUSED */ 632 static int 633 nfs_close(struct vop_close_args *ap) 634 { 635 struct vnode *vp = ap->a_vp; 636 struct nfsnode *np = VTONFS(vp); 637 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 638 int error = 0; 639 thread_t td = curthread; 640 641 vn_lock(vp, LK_UPGRADE | LK_RETRY); /* XXX */ 642 lwkt_gettoken(&nmp->nm_token); 643 644 if (vp->v_type == VREG) { 645 if (np->n_flag & NLMODIFIED) { 646 if (NFS_ISV3(vp)) { 647 /* 648 * Under NFSv3 we have dirty buffers to dispose of. We 649 * must flush them to the NFS server. We have the option 650 * of waiting all the way through the commit rpc or just 651 * waiting for the initial write. The default is to only 652 * wait through the initial write so the data is in the 653 * server's cache, which is roughly similar to the state 654 * a standard disk subsystem leaves the file in on close(). 655 * 656 * We cannot clear the NLMODIFIED bit in np->n_flag due to 657 * potential races with other processes, and certainly 658 * cannot clear it if we don't commit. 659 */ 660 int cm = nfsv3_commit_on_close ? 1 : 0; 661 error = nfs_flush(vp, MNT_WAIT, td, cm); 662 /* np->n_flag &= ~NLMODIFIED; */ 663 } else { 664 error = nfs_vinvalbuf(vp, V_SAVE, 1); 665 } 666 np->n_attrstamp = 0; 667 } 668 if (np->n_flag & NWRITEERR) { 669 np->n_flag &= ~NWRITEERR; 670 error = np->n_error; 671 } 672 } 673 vop_stdclose(ap); 674 lwkt_reltoken(&nmp->nm_token); 675 676 return (error); 677 } 678 679 /* 680 * nfs getattr call from vfs. 681 * 682 * nfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 683 */ 684 static int 685 nfs_getattr(struct vop_getattr_args *ap) 686 { 687 struct vnode *vp = ap->a_vp; 688 struct nfsnode *np = VTONFS(vp); 689 struct nfsmount *nmp; 690 int error = 0; 691 thread_t td = curthread; 692 struct nfsm_info info; 693 694 info.mrep = NULL; 695 info.v3 = NFS_ISV3(vp); 696 nmp = VFSTONFS(vp->v_mount); 697 698 lwkt_gettoken(&nmp->nm_token); 699 700 /* 701 * Update local times for special files. 702 */ 703 if (np->n_flag & (NACC | NUPD)) 704 np->n_flag |= NCHG; 705 /* 706 * First look in the cache. 707 */ 708 if (nfs_getattrcache(vp, ap->a_vap) == 0) 709 goto done; 710 711 if (info.v3 && nfsaccess_cache_timeout > 0) { 712 nfsstats.accesscache_misses++; 713 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, nfs_vpcred(vp, ND_CHECK)); 714 if (nfs_getattrcache(vp, ap->a_vap) == 0) 715 goto done; 716 } 717 718 nfsstats.rpccnt[NFSPROC_GETATTR]++; 719 nfsm_reqhead(&info, vp, NFSPROC_GETATTR, NFSX_FH(info.v3)); 720 ERROROUT(nfsm_fhtom(&info, vp)); 721 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_GETATTR, td, 722 nfs_vpcred(vp, ND_CHECK), &error)); 723 if (error == 0) { 724 ERROROUT(nfsm_loadattr(&info, vp, ap->a_vap)); 725 } 726 m_freem(info.mrep); 727 info.mrep = NULL; 728 done: 729 /* 730 * NFS doesn't support chflags flags. If the nfs mount was 731 * made -o cache set the UF_CACHE bit for swapcache. 732 */ 733 if ((nmp->nm_flag & NFSMNT_CACHE) && (vp->v_flag & VROOT)) 734 ap->a_vap->va_flags |= UF_CACHE; 735 nfsmout: 736 lwkt_reltoken(&nmp->nm_token); 737 return (error); 738 } 739 740 /* 741 * nfs setattr call. 742 * 743 * nfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred) 744 */ 745 static int 746 nfs_setattr(struct vop_setattr_args *ap) 747 { 748 struct vnode *vp = ap->a_vp; 749 struct nfsnode *np = VTONFS(vp); 750 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 751 struct vattr *vap = ap->a_vap; 752 int error = 0; 753 int kflags = 0; 754 off_t tsize; 755 thread_t td = curthread; 756 757 #ifndef nolint 758 tsize = (off_t)0; 759 #endif 760 /* 761 * Setting of flags is not supported. 762 */ 763 if (vap->va_flags != VNOVAL) 764 return (EOPNOTSUPP); 765 766 /* 767 * Disallow write attempts if the filesystem is mounted read-only. 768 */ 769 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 770 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 771 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 772 (vp->v_mount->mnt_flag & MNT_RDONLY)) 773 return (EROFS); 774 775 lwkt_gettoken(&nmp->nm_token); 776 777 /* 778 * Handle size changes 779 */ 780 if (vap->va_size != VNOVAL) { 781 /* 782 * truncation requested 783 */ 784 switch (vp->v_type) { 785 case VDIR: 786 lwkt_reltoken(&nmp->nm_token); 787 return (EISDIR); 788 case VCHR: 789 case VBLK: 790 case VSOCK: 791 case VFIFO: 792 if (vap->va_mtime.tv_sec == VNOVAL && 793 vap->va_atime.tv_sec == VNOVAL && 794 vap->va_mode == (mode_t)VNOVAL && 795 vap->va_uid == (uid_t)VNOVAL && 796 vap->va_gid == (gid_t)VNOVAL) { 797 lwkt_reltoken(&nmp->nm_token); 798 return (0); 799 } 800 vap->va_size = VNOVAL; 801 break; 802 default: 803 /* 804 * Disallow write attempts if the filesystem is 805 * mounted read-only. 806 */ 807 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 808 lwkt_reltoken(&nmp->nm_token); 809 return (EROFS); 810 } 811 812 tsize = np->n_size; 813 again: 814 error = nfs_meta_setsize(vp, td, vap->va_size, 0); 815 816 #if 0 817 if (np->n_flag & NLMODIFIED) { 818 if (vap->va_size == 0) 819 error = nfs_vinvalbuf(vp, 0, 1); 820 else 821 error = nfs_vinvalbuf(vp, V_SAVE, 1); 822 } 823 #endif 824 /* 825 * note: this loop case almost always happens at 826 * least once per truncation. 827 */ 828 if (error == 0 && np->n_size != vap->va_size) 829 goto again; 830 np->n_vattr.va_size = vap->va_size; 831 kflags |= NOTE_WRITE; 832 if (tsize < vap->va_size) 833 kflags |= NOTE_EXTEND; 834 break; 835 } 836 } 837 838 /* 839 * If setting the mtime or if server/other-client modifications have 840 * been detected, we must fully flush any pending writes. 841 * 842 * This will slow down cp/cpdup/rdist/rsync and other operations which 843 * might call [l]utimes() to set the mtime after writing to a file, 844 * but honestly there is no way to properly defer the write flush 845 * and still get reasonably accurate/dependable synchronization of 846 * [l]utimes(). 847 */ 848 if ((np->n_flag & NLMODIFIED) && vp->v_type == VREG) { 849 if ((np->n_flag & NRMODIFIED) || 850 (vap->va_mtime.tv_sec != VNOVAL)) { 851 error = nfs_vinvalbuf(vp, V_SAVE, 1); 852 if (error == EINTR) { 853 lwkt_reltoken(&nmp->nm_token); 854 return (error); 855 } 856 } 857 } 858 859 /* 860 * Get the blasted mtime to report properly. 861 */ 862 if (vap->va_mtime.tv_sec != VNOVAL) { 863 np->n_mtime = vap->va_mtime.tv_sec; 864 np->n_flag &= ~NUPD; 865 np->n_vattr.va_mtime = vap->va_mtime; 866 } 867 868 /* 869 * Issue the setattr rpc, adjust our mtime and make sure NUPD 870 * has been cleared so it does not get overridden. 871 */ 872 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 873 if (error == 0) 874 kflags |= NOTE_EXTEND; 875 876 /* 877 * Sanity check if a truncation was issued. This should only occur 878 * if multiple processes are racing on the same file. 879 */ 880 if (error == 0 && vap->va_size != VNOVAL && 881 np->n_size != vap->va_size) { 882 kprintf("NFS ftruncate: server disagrees on the file size: " 883 "%jd/%jd/%jd\n", 884 (intmax_t)tsize, 885 (intmax_t)vap->va_size, 886 (intmax_t)np->n_size); 887 goto again; 888 } 889 if (error && vap->va_size != VNOVAL) { 890 np->n_size = np->n_vattr.va_size = tsize; 891 nfs_meta_setsize(vp, td, np->n_size, 0); 892 } 893 lwkt_reltoken(&nmp->nm_token); 894 nfs_knote(vp, kflags); 895 896 return (error); 897 } 898 899 /* 900 * Do an nfs setattr rpc. 901 */ 902 static int 903 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 904 struct ucred *cred, struct thread *td) 905 { 906 struct nfsv2_sattr *sp; 907 struct nfsnode *np = VTONFS(vp); 908 u_int32_t *tl; 909 int error = 0, wccflag = NFSV3_WCCRATTR; 910 struct nfsm_info info; 911 912 info.mrep = NULL; 913 info.v3 = NFS_ISV3(vp); 914 915 nfsstats.rpccnt[NFSPROC_SETATTR]++; 916 nfsm_reqhead(&info, vp, NFSPROC_SETATTR, 917 NFSX_FH(info.v3) + NFSX_SATTR(info.v3)); 918 ERROROUT(nfsm_fhtom(&info, vp)); 919 if (info.v3) { 920 nfsm_v3attrbuild(&info, vap, TRUE); 921 tl = nfsm_build(&info, NFSX_UNSIGNED); 922 *tl = nfs_false; 923 } else { 924 sp = nfsm_build(&info, NFSX_V2SATTR); 925 if (vap->va_mode == (mode_t)VNOVAL) 926 sp->sa_mode = nfs_xdrneg1; 927 else 928 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 929 if (vap->va_uid == (uid_t)VNOVAL) 930 sp->sa_uid = nfs_xdrneg1; 931 else 932 sp->sa_uid = txdr_unsigned(vap->va_uid); 933 if (vap->va_gid == (gid_t)VNOVAL) 934 sp->sa_gid = nfs_xdrneg1; 935 else 936 sp->sa_gid = txdr_unsigned(vap->va_gid); 937 sp->sa_size = txdr_unsigned(vap->va_size); 938 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 939 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 940 } 941 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_SETATTR, td, cred, &error)); 942 if (info.v3) { 943 np->n_modestamp = 0; 944 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 945 } else { 946 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 947 } 948 m_freem(info.mrep); 949 info.mrep = NULL; 950 nfsmout: 951 return (error); 952 } 953 954 static 955 void 956 nfs_cache_setvp(struct nchandle *nch, struct vnode *vp, int nctimeout) 957 { 958 if (nctimeout == 0) 959 nctimeout = 1; 960 else 961 nctimeout *= hz; 962 cache_setvp(nch, vp); 963 cache_settimeout(nch, nctimeout); 964 } 965 966 /* 967 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 968 * nfs_lookup() until all remaining new api calls are implemented. 969 * 970 * Resolve a namecache entry. This function is passed a locked ncp and 971 * must call nfs_cache_setvp() on it as appropriate to resolve the entry. 972 */ 973 static int 974 nfs_nresolve(struct vop_nresolve_args *ap) 975 { 976 struct thread *td = curthread; 977 struct namecache *ncp; 978 struct nfsmount *nmp; 979 struct nfsnode *np; 980 struct vnode *dvp; 981 struct vnode *nvp; 982 nfsfh_t *fhp; 983 int attrflag; 984 int fhsize; 985 int error; 986 int tmp_error; 987 int len; 988 struct nfsm_info info; 989 990 dvp = ap->a_dvp; 991 nmp = VFSTONFS(dvp->v_mount); 992 993 lwkt_gettoken(&nmp->nm_token); 994 995 if ((error = vget(dvp, LK_SHARED)) != 0) { 996 lwkt_reltoken(&nmp->nm_token); 997 return (error); 998 } 999 1000 info.mrep = NULL; 1001 info.v3 = NFS_ISV3(dvp); 1002 1003 nvp = NULL; 1004 nfsstats.lookupcache_misses++; 1005 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1006 ncp = ap->a_nch->ncp; 1007 len = ncp->nc_nlen; 1008 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 1009 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1010 ERROROUT(nfsm_fhtom(&info, dvp)); 1011 ERROROUT(nfsm_strtom(&info, ncp->nc_name, len, NFS_MAXNAMLEN)); 1012 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, 1013 ap->a_cred, &error)); 1014 if (error) { 1015 /* 1016 * Cache negatve lookups to reduce NFS traffic, but use 1017 * a fast timeout. Otherwise use a timeout of 1 tick. 1018 * XXX we should add a namecache flag for no-caching 1019 * to uncache the negative hit as soon as possible, but 1020 * we cannot simply destroy the entry because it is used 1021 * as a placeholder by the caller. 1022 * 1023 * The refactored nfs code will overwrite a non-zero error 1024 * with 0 when we use ERROROUT(), so don't here. 1025 */ 1026 if (error == ENOENT) 1027 nfs_cache_setvp(ap->a_nch, NULL, nfsneg_cache_timeout); 1028 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 1029 NFS_LATTR_NOSHRINK); 1030 if (tmp_error) { 1031 error = tmp_error; 1032 goto nfsmout; 1033 } 1034 m_freem(info.mrep); 1035 info.mrep = NULL; 1036 goto nfsmout; 1037 } 1038 1039 /* 1040 * Success, get the file handle, do various checks, and load 1041 * post-operation data from the reply packet. Theoretically 1042 * we should never be looking up "." so, theoretically, we 1043 * should never get the same file handle as our directory. But 1044 * we check anyway. XXX 1045 * 1046 * Note that no timeout is set for the positive cache hit. We 1047 * assume, theoretically, that ESTALE returns will be dealt with 1048 * properly to handle NFS races and in anycase we cannot depend 1049 * on a timeout to deal with NFS open/create/excl issues so instead 1050 * of a bad hack here the rest of the NFS client code needs to do 1051 * the right thing. 1052 */ 1053 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 1054 1055 np = VTONFS(dvp); 1056 if (NFS_CMPFH(np, fhp, fhsize)) { 1057 vref(dvp); 1058 nvp = dvp; 1059 } else { 1060 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, NULL); 1061 if (error) { 1062 m_freem(info.mrep); 1063 info.mrep = NULL; 1064 vput(dvp); 1065 lwkt_reltoken(&nmp->nm_token); 1066 return (error); 1067 } 1068 nvp = NFSTOV(np); 1069 } 1070 if (info.v3) { 1071 ERROROUT(nfsm_postop_attr(&info, nvp, &attrflag, 1072 NFS_LATTR_NOSHRINK)); 1073 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1074 NFS_LATTR_NOSHRINK)); 1075 } else { 1076 ERROROUT(nfsm_loadattr(&info, nvp, NULL)); 1077 } 1078 nfs_cache_setvp(ap->a_nch, nvp, nfspos_cache_timeout); 1079 m_freem(info.mrep); 1080 info.mrep = NULL; 1081 nfsmout: 1082 lwkt_reltoken(&nmp->nm_token); 1083 vput(dvp); 1084 if (nvp) { 1085 if (nvp == dvp) 1086 vrele(nvp); 1087 else 1088 vput(nvp); 1089 } 1090 return (error); 1091 } 1092 1093 /* 1094 * 'cached' nfs directory lookup 1095 * 1096 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 1097 * 1098 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 1099 * struct componentname *a_cnp) 1100 */ 1101 static int 1102 nfs_lookup(struct vop_old_lookup_args *ap) 1103 { 1104 struct componentname *cnp = ap->a_cnp; 1105 struct vnode *dvp = ap->a_dvp; 1106 struct vnode **vpp = ap->a_vpp; 1107 int flags = cnp->cn_flags; 1108 struct vnode *newvp; 1109 struct vnode *notvp; 1110 struct nfsmount *nmp; 1111 long len; 1112 nfsfh_t *fhp; 1113 struct nfsnode *np; 1114 int lockparent, wantparent, attrflag, fhsize; 1115 int error; 1116 int tmp_error; 1117 struct nfsm_info info; 1118 1119 info.mrep = NULL; 1120 info.v3 = NFS_ISV3(dvp); 1121 error = 0; 1122 1123 notvp = (cnp->cn_flags & CNP_NOTVP) ? cnp->cn_notvp : NULL; 1124 1125 /* 1126 * Read-only mount check and directory check. 1127 */ 1128 *vpp = NULLVP; 1129 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 1130 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 1131 return (EROFS); 1132 1133 if (dvp->v_type != VDIR) 1134 return (ENOTDIR); 1135 1136 /* 1137 * Look it up in the cache. Note that ENOENT is only returned if we 1138 * previously entered a negative hit (see later on). The additional 1139 * nfsneg_cache_timeout check causes previously cached results to 1140 * be instantly ignored if the negative caching is turned off. 1141 */ 1142 lockparent = flags & CNP_LOCKPARENT; 1143 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 1144 nmp = VFSTONFS(dvp->v_mount); 1145 np = VTONFS(dvp); 1146 1147 lwkt_gettoken(&nmp->nm_token); 1148 1149 /* 1150 * Go to the wire. 1151 */ 1152 error = 0; 1153 newvp = NULLVP; 1154 nfsstats.lookupcache_misses++; 1155 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1156 len = cnp->cn_namelen; 1157 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 1158 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1159 ERROROUT(nfsm_fhtom(&info, dvp)); 1160 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 1161 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, cnp->cn_td, 1162 cnp->cn_cred, &error)); 1163 if (error) { 1164 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 1165 NFS_LATTR_NOSHRINK); 1166 if (tmp_error) { 1167 error = tmp_error; 1168 goto nfsmout; 1169 } 1170 1171 m_freem(info.mrep); 1172 info.mrep = NULL; 1173 goto nfsmout; 1174 } 1175 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 1176 1177 /* 1178 * Handle RENAME case... 1179 */ 1180 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1181 if (NFS_CMPFH(np, fhp, fhsize)) { 1182 m_freem(info.mrep); 1183 info.mrep = NULL; 1184 lwkt_reltoken(&nmp->nm_token); 1185 return (EISDIR); 1186 } 1187 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1188 if (error) { 1189 m_freem(info.mrep); 1190 info.mrep = NULL; 1191 lwkt_reltoken(&nmp->nm_token); 1192 return (error); 1193 } 1194 newvp = NFSTOV(np); 1195 if (info.v3) { 1196 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1197 NFS_LATTR_NOSHRINK)); 1198 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1199 NFS_LATTR_NOSHRINK)); 1200 } else { 1201 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1202 } 1203 *vpp = newvp; 1204 m_freem(info.mrep); 1205 info.mrep = NULL; 1206 if (!lockparent) { 1207 vn_unlock(dvp); 1208 cnp->cn_flags |= CNP_PDIRUNLOCK; 1209 } 1210 lwkt_reltoken(&nmp->nm_token); 1211 return (0); 1212 } 1213 1214 if (flags & CNP_ISDOTDOT) { 1215 vn_unlock(dvp); 1216 cnp->cn_flags |= CNP_PDIRUNLOCK; 1217 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1218 if (error) { 1219 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1220 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1221 lwkt_reltoken(&nmp->nm_token); 1222 return (error); /* NOTE: return error from nget */ 1223 } 1224 newvp = NFSTOV(np); 1225 if (lockparent) { 1226 error = vn_lock(dvp, LK_EXCLUSIVE | LK_FAILRECLAIM); 1227 if (error) { 1228 vput(newvp); 1229 lwkt_reltoken(&nmp->nm_token); 1230 return (error); 1231 } 1232 cnp->cn_flags |= CNP_PDIRUNLOCK; 1233 } 1234 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1235 vref(dvp); 1236 newvp = dvp; 1237 } else { 1238 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1239 if (error) { 1240 m_freem(info.mrep); 1241 info.mrep = NULL; 1242 lwkt_reltoken(&nmp->nm_token); 1243 return (error); 1244 } 1245 if (!lockparent) { 1246 vn_unlock(dvp); 1247 cnp->cn_flags |= CNP_PDIRUNLOCK; 1248 } 1249 newvp = NFSTOV(np); 1250 } 1251 if (info.v3) { 1252 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1253 NFS_LATTR_NOSHRINK)); 1254 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1255 NFS_LATTR_NOSHRINK)); 1256 } else { 1257 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1258 } 1259 #if 0 1260 /* XXX MOVE TO nfs_nremove() */ 1261 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1262 cnp->cn_nameiop != NAMEI_DELETE) { 1263 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1264 } 1265 #endif 1266 *vpp = newvp; 1267 m_freem(info.mrep); 1268 info.mrep = NULL; 1269 nfsmout: 1270 if (error) { 1271 if (newvp != NULLVP) { 1272 vrele(newvp); 1273 *vpp = NULLVP; 1274 } 1275 if ((cnp->cn_nameiop == NAMEI_CREATE || 1276 cnp->cn_nameiop == NAMEI_RENAME) && 1277 error == ENOENT) { 1278 if (!lockparent) { 1279 vn_unlock(dvp); 1280 cnp->cn_flags |= CNP_PDIRUNLOCK; 1281 } 1282 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1283 error = EROFS; 1284 else 1285 error = EJUSTRETURN; 1286 } 1287 } 1288 lwkt_reltoken(&nmp->nm_token); 1289 return (error); 1290 } 1291 1292 /* 1293 * nfs read call. 1294 * Just call nfs_bioread() to do the work. 1295 * 1296 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1297 * struct ucred *a_cred) 1298 */ 1299 static int 1300 nfs_read(struct vop_read_args *ap) 1301 { 1302 struct vnode *vp = ap->a_vp; 1303 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1304 int error; 1305 1306 lwkt_gettoken(&nmp->nm_token); 1307 error = nfs_bioread(vp, ap->a_uio, ap->a_ioflag); 1308 lwkt_reltoken(&nmp->nm_token); 1309 1310 return error; 1311 } 1312 1313 /* 1314 * nfs readlink call 1315 * 1316 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1317 */ 1318 static int 1319 nfs_readlink(struct vop_readlink_args *ap) 1320 { 1321 struct vnode *vp = ap->a_vp; 1322 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1323 int error; 1324 1325 if (vp->v_type != VLNK) 1326 return (EINVAL); 1327 1328 lwkt_gettoken(&nmp->nm_token); 1329 error = nfs_bioread(vp, ap->a_uio, 0); 1330 lwkt_reltoken(&nmp->nm_token); 1331 1332 return error; 1333 } 1334 1335 /* 1336 * Do a readlink rpc. 1337 * Called by nfs_doio() from below the buffer cache. 1338 */ 1339 int 1340 nfs_readlinkrpc_uio(struct vnode *vp, struct uio *uiop) 1341 { 1342 int error = 0, len, attrflag; 1343 struct nfsm_info info; 1344 1345 info.mrep = NULL; 1346 info.v3 = NFS_ISV3(vp); 1347 1348 nfsstats.rpccnt[NFSPROC_READLINK]++; 1349 nfsm_reqhead(&info, vp, NFSPROC_READLINK, NFSX_FH(info.v3)); 1350 ERROROUT(nfsm_fhtom(&info, vp)); 1351 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READLINK, uiop->uio_td, 1352 nfs_vpcred(vp, ND_CHECK), &error)); 1353 if (info.v3) { 1354 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1355 NFS_LATTR_NOSHRINK)); 1356 } 1357 if (!error) { 1358 NEGATIVEOUT(len = nfsm_strsiz(&info, NFS_MAXPATHLEN)); 1359 if (len == NFS_MAXPATHLEN) { 1360 struct nfsnode *np = VTONFS(vp); 1361 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1362 len = np->n_size; 1363 } 1364 ERROROUT(nfsm_mtouio(&info, uiop, len)); 1365 } 1366 m_freem(info.mrep); 1367 info.mrep = NULL; 1368 nfsmout: 1369 return (error); 1370 } 1371 1372 /* 1373 * nfs synchronous read rpc using UIO 1374 */ 1375 int 1376 nfs_readrpc_uio(struct vnode *vp, struct uio *uiop) 1377 { 1378 u_int32_t *tl; 1379 struct nfsmount *nmp; 1380 int error = 0, len, retlen, tsiz, eof, attrflag; 1381 struct nfsm_info info; 1382 off_t tmp_off; 1383 1384 info.mrep = NULL; 1385 info.v3 = NFS_ISV3(vp); 1386 1387 #ifndef nolint 1388 eof = 0; 1389 #endif 1390 nmp = VFSTONFS(vp->v_mount); 1391 1392 tsiz = uiop->uio_resid; 1393 tmp_off = uiop->uio_offset + tsiz; 1394 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uiop->uio_offset) 1395 return (EFBIG); 1396 tmp_off = uiop->uio_offset; 1397 while (tsiz > 0) { 1398 nfsstats.rpccnt[NFSPROC_READ]++; 1399 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1400 nfsm_reqhead(&info, vp, NFSPROC_READ, 1401 NFSX_FH(info.v3) + NFSX_UNSIGNED * 3); 1402 ERROROUT(nfsm_fhtom(&info, vp)); 1403 tl = nfsm_build(&info, NFSX_UNSIGNED * 3); 1404 if (info.v3) { 1405 txdr_hyper(uiop->uio_offset, tl); 1406 *(tl + 2) = txdr_unsigned(len); 1407 } else { 1408 *tl++ = txdr_unsigned(uiop->uio_offset); 1409 *tl++ = txdr_unsigned(len); 1410 *tl = 0; 1411 } 1412 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READ, uiop->uio_td, 1413 nfs_vpcred(vp, ND_READ), &error)); 1414 if (info.v3) { 1415 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1416 NFS_LATTR_NOSHRINK)); 1417 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 1418 eof = fxdr_unsigned(int, *(tl + 1)); 1419 } else { 1420 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1421 } 1422 NEGATIVEOUT(retlen = nfsm_strsiz(&info, len)); 1423 ERROROUT(nfsm_mtouio(&info, uiop, retlen)); 1424 m_freem(info.mrep); 1425 info.mrep = NULL; 1426 1427 /* 1428 * Handle short-read from server (NFSv3). If EOF is not 1429 * flagged (and no error occurred), but retlen is less 1430 * then the request size, we must zero-fill the remainder. 1431 */ 1432 if (retlen < len && info.v3 && eof == 0) { 1433 ERROROUT(uiomovez(len - retlen, uiop)); 1434 retlen = len; 1435 } 1436 tsiz -= retlen; 1437 1438 /* 1439 * Terminate loop on EOF or zero-length read. 1440 * 1441 * For NFSv2 a short-read indicates EOF, not zero-fill, 1442 * and also terminates the loop. 1443 */ 1444 if (info.v3) { 1445 if (eof || retlen == 0) 1446 tsiz = 0; 1447 } else if (retlen < len) { 1448 tsiz = 0; 1449 } 1450 } 1451 nfsmout: 1452 return (error); 1453 } 1454 1455 /* 1456 * nfs write call 1457 */ 1458 int 1459 nfs_writerpc_uio(struct vnode *vp, struct uio *uiop, 1460 int *iomode, int *must_commit) 1461 { 1462 u_int32_t *tl; 1463 int32_t backup; 1464 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1465 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1466 int committed = NFSV3WRITE_FILESYNC; 1467 struct nfsm_info info; 1468 1469 info.mrep = NULL; 1470 info.v3 = NFS_ISV3(vp); 1471 1472 #ifndef DIAGNOSTIC 1473 if (uiop->uio_iovcnt != 1) 1474 panic("nfs: writerpc iovcnt > 1"); 1475 #endif 1476 *must_commit = 0; 1477 tsiz = uiop->uio_resid; 1478 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1479 return (EFBIG); 1480 while (tsiz > 0) { 1481 nfsstats.rpccnt[NFSPROC_WRITE]++; 1482 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1483 nfsm_reqhead(&info, vp, NFSPROC_WRITE, 1484 NFSX_FH(info.v3) + 5 * NFSX_UNSIGNED + 1485 nfsm_rndup(len)); 1486 ERROROUT(nfsm_fhtom(&info, vp)); 1487 if (info.v3) { 1488 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 1489 txdr_hyper(uiop->uio_offset, tl); 1490 tl += 2; 1491 *tl++ = txdr_unsigned(len); 1492 *tl++ = txdr_unsigned(*iomode); 1493 *tl = txdr_unsigned(len); 1494 } else { 1495 u_int32_t x; 1496 1497 tl = nfsm_build(&info, 4 * NFSX_UNSIGNED); 1498 /* Set both "begin" and "current" to non-garbage. */ 1499 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1500 *tl++ = x; /* "begin offset" */ 1501 *tl++ = x; /* "current offset" */ 1502 x = txdr_unsigned(len); 1503 *tl++ = x; /* total to this offset */ 1504 *tl = x; /* size of this write */ 1505 } 1506 ERROROUT(nfsm_uiotom(&info, uiop, len)); 1507 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_WRITE, uiop->uio_td, 1508 nfs_vpcred(vp, ND_WRITE), &error)); 1509 if (info.v3) { 1510 /* 1511 * The write RPC returns a before and after mtime. The 1512 * nfsm_wcc_data() macro checks the before n_mtime 1513 * against the before time and stores the after time 1514 * in the nfsnode's cached vattr and n_mtime field. 1515 * The NRMODIFIED bit will be set if the before 1516 * time did not match the original mtime. 1517 */ 1518 wccflag = NFSV3_WCCCHK; 1519 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 1520 if (error == 0) { 1521 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF)); 1522 rlen = fxdr_unsigned(int, *tl++); 1523 if (rlen == 0) { 1524 error = NFSERR_IO; 1525 m_freem(info.mrep); 1526 info.mrep = NULL; 1527 break; 1528 } else if (rlen < len) { 1529 backup = len - rlen; 1530 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base - backup; 1531 uiop->uio_iov->iov_len += backup; 1532 uiop->uio_offset -= backup; 1533 uiop->uio_resid += backup; 1534 len = rlen; 1535 } 1536 commit = fxdr_unsigned(int, *tl++); 1537 1538 /* 1539 * Return the lowest committment level 1540 * obtained by any of the RPCs. 1541 */ 1542 if (committed == NFSV3WRITE_FILESYNC) 1543 committed = commit; 1544 else if (committed == NFSV3WRITE_DATASYNC && 1545 commit == NFSV3WRITE_UNSTABLE) 1546 committed = commit; 1547 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1548 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1549 NFSX_V3WRITEVERF); 1550 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1551 } else if (bcmp((caddr_t)tl, 1552 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1553 *must_commit = 1; 1554 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1555 NFSX_V3WRITEVERF); 1556 } 1557 } 1558 } else { 1559 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1560 } 1561 m_freem(info.mrep); 1562 info.mrep = NULL; 1563 if (error) 1564 break; 1565 tsiz -= len; 1566 } 1567 nfsmout: 1568 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1569 committed = NFSV3WRITE_FILESYNC; 1570 *iomode = committed; 1571 if (error) 1572 uiop->uio_resid = tsiz; 1573 return (error); 1574 } 1575 1576 /* 1577 * nfs mknod rpc 1578 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1579 * mode set to specify the file type and the size field for rdev. 1580 */ 1581 static int 1582 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1583 struct vattr *vap) 1584 { 1585 struct nfsv2_sattr *sp; 1586 u_int32_t *tl; 1587 struct vnode *newvp = NULL; 1588 struct nfsnode *np = NULL; 1589 struct vattr vattr; 1590 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1591 int rmajor, rminor; 1592 struct nfsm_info info; 1593 1594 info.mrep = NULL; 1595 info.v3 = NFS_ISV3(dvp); 1596 1597 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1598 rmajor = txdr_unsigned(vap->va_rmajor); 1599 rminor = txdr_unsigned(vap->va_rminor); 1600 } else if (vap->va_type == VFIFO || vap->va_type == VSOCK) { 1601 rmajor = nfs_xdrneg1; 1602 rminor = nfs_xdrneg1; 1603 } else { 1604 return (EOPNOTSUPP); 1605 } 1606 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1607 return (error); 1608 } 1609 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1610 nfsm_reqhead(&info, dvp, NFSPROC_MKNOD, 1611 NFSX_FH(info.v3) + 4 * NFSX_UNSIGNED + 1612 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1613 ERROROUT(nfsm_fhtom(&info, dvp)); 1614 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1615 NFS_MAXNAMLEN)); 1616 if (info.v3) { 1617 tl = nfsm_build(&info, NFSX_UNSIGNED); 1618 *tl++ = vtonfsv3_type(vap->va_type); 1619 nfsm_v3attrbuild(&info, vap, FALSE); 1620 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1621 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1622 *tl++ = txdr_unsigned(vap->va_rmajor); 1623 *tl = txdr_unsigned(vap->va_rminor); 1624 } 1625 } else { 1626 sp = nfsm_build(&info, NFSX_V2SATTR); 1627 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1628 sp->sa_uid = nfs_xdrneg1; 1629 sp->sa_gid = nfs_xdrneg1; 1630 sp->sa_size = makeudev(rmajor, rminor); 1631 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1632 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1633 } 1634 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKNOD, cnp->cn_td, 1635 cnp->cn_cred, &error)); 1636 if (!error) { 1637 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1638 if (!gotvp) { 1639 if (newvp) { 1640 vput(newvp); 1641 newvp = NULL; 1642 } 1643 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1644 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1645 if (!error) 1646 newvp = NFSTOV(np); 1647 } 1648 } 1649 if (info.v3) { 1650 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1651 } 1652 m_freem(info.mrep); 1653 info.mrep = NULL; 1654 nfsmout: 1655 if (error) { 1656 if (newvp) 1657 vput(newvp); 1658 } else { 1659 *vpp = newvp; 1660 } 1661 VTONFS(dvp)->n_flag |= NLMODIFIED; 1662 if (!wccflag) 1663 VTONFS(dvp)->n_attrstamp = 0; 1664 return (error); 1665 } 1666 1667 /* 1668 * nfs mknod vop 1669 * just call nfs_mknodrpc() to do the work. 1670 * 1671 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1672 * struct componentname *a_cnp, struct vattr *a_vap) 1673 */ 1674 /* ARGSUSED */ 1675 static int 1676 nfs_mknod(struct vop_old_mknod_args *ap) 1677 { 1678 struct nfsmount *nmp = VFSTONFS(ap->a_dvp->v_mount); 1679 int error; 1680 1681 lwkt_gettoken(&nmp->nm_token); 1682 error = nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1683 lwkt_reltoken(&nmp->nm_token); 1684 if (error == 0) 1685 nfs_knote(ap->a_dvp, NOTE_WRITE); 1686 1687 return error; 1688 } 1689 1690 static u_long create_verf; 1691 /* 1692 * nfs file create call 1693 * 1694 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1695 * struct componentname *a_cnp, struct vattr *a_vap) 1696 */ 1697 static int 1698 nfs_create(struct vop_old_create_args *ap) 1699 { 1700 struct vnode *dvp = ap->a_dvp; 1701 struct vattr *vap = ap->a_vap; 1702 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 1703 struct componentname *cnp = ap->a_cnp; 1704 struct nfsv2_sattr *sp; 1705 u_int32_t *tl; 1706 struct nfsnode *np = NULL; 1707 struct vnode *newvp = NULL; 1708 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1709 struct vattr vattr; 1710 struct nfsm_info info; 1711 1712 info.mrep = NULL; 1713 info.v3 = NFS_ISV3(dvp); 1714 lwkt_gettoken(&nmp->nm_token); 1715 1716 /* 1717 * Oops, not for me.. 1718 */ 1719 if (vap->va_type == VSOCK) { 1720 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); 1721 lwkt_reltoken(&nmp->nm_token); 1722 return error; 1723 } 1724 1725 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1726 lwkt_reltoken(&nmp->nm_token); 1727 return (error); 1728 } 1729 if (vap->va_vaflags & VA_EXCLUSIVE) 1730 fmode |= O_EXCL; 1731 again: 1732 nfsstats.rpccnt[NFSPROC_CREATE]++; 1733 nfsm_reqhead(&info, dvp, NFSPROC_CREATE, 1734 NFSX_FH(info.v3) + 2 * NFSX_UNSIGNED + 1735 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1736 ERROROUT(nfsm_fhtom(&info, dvp)); 1737 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1738 NFS_MAXNAMLEN)); 1739 if (info.v3) { 1740 tl = nfsm_build(&info, NFSX_UNSIGNED); 1741 if (fmode & O_EXCL) { 1742 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1743 tl = nfsm_build(&info, NFSX_V3CREATEVERF); 1744 #ifdef INET 1745 if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) 1746 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia)->sin_addr.s_addr; 1747 else 1748 #endif 1749 *tl++ = create_verf; 1750 *tl = ++create_verf; 1751 } else { 1752 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1753 nfsm_v3attrbuild(&info, vap, FALSE); 1754 } 1755 } else { 1756 sp = nfsm_build(&info, NFSX_V2SATTR); 1757 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1758 sp->sa_uid = nfs_xdrneg1; 1759 sp->sa_gid = nfs_xdrneg1; 1760 sp->sa_size = 0; 1761 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1762 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1763 } 1764 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_CREATE, cnp->cn_td, 1765 cnp->cn_cred, &error)); 1766 if (error == 0) { 1767 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1768 if (!gotvp) { 1769 if (newvp) { 1770 vput(newvp); 1771 newvp = NULL; 1772 } 1773 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1774 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1775 if (!error) 1776 newvp = NFSTOV(np); 1777 } 1778 } 1779 if (info.v3) { 1780 if (error == 0) 1781 error = nfsm_wcc_data(&info, dvp, &wccflag); 1782 else 1783 (void)nfsm_wcc_data(&info, dvp, &wccflag); 1784 } 1785 m_freem(info.mrep); 1786 info.mrep = NULL; 1787 nfsmout: 1788 if (error) { 1789 if (info.v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1790 KKASSERT(newvp == NULL); 1791 fmode &= ~O_EXCL; 1792 goto again; 1793 } 1794 } else if (info.v3 && (fmode & O_EXCL)) { 1795 /* 1796 * We are normally called with only a partially initialized 1797 * VAP. Since the NFSv3 spec says that server may use the 1798 * file attributes to store the verifier, the spec requires 1799 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1800 * in atime, but we can't really assume that all servers will 1801 * so we ensure that our SETATTR sets both atime and mtime. 1802 */ 1803 if (vap->va_mtime.tv_sec == VNOVAL) 1804 vfs_timestamp(&vap->va_mtime); 1805 if (vap->va_atime.tv_sec == VNOVAL) 1806 vap->va_atime = vap->va_mtime; 1807 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1808 } 1809 if (error == 0) { 1810 /* 1811 * The new np may have enough info for access 1812 * checks, make sure rucred and wucred are 1813 * initialized for read and write rpc's. 1814 */ 1815 np = VTONFS(newvp); 1816 if (np->n_rucred == NULL) 1817 np->n_rucred = nfs_crhold(cnp->cn_cred); 1818 if (np->n_wucred == NULL) 1819 np->n_wucred = nfs_crhold(cnp->cn_cred); 1820 *ap->a_vpp = newvp; 1821 nfs_knote(dvp, NOTE_WRITE); 1822 } else if (newvp) { 1823 vput(newvp); 1824 } 1825 VTONFS(dvp)->n_flag |= NLMODIFIED; 1826 if (!wccflag) 1827 VTONFS(dvp)->n_attrstamp = 0; 1828 lwkt_reltoken(&nmp->nm_token); 1829 return (error); 1830 } 1831 1832 /* 1833 * nfs file remove call 1834 * To try and make nfs semantics closer to ufs semantics, a file that has 1835 * other processes using the vnode is renamed instead of removed and then 1836 * removed later on the last close. 1837 * - If v_refcnt > 1 1838 * If a rename is not already in the works 1839 * call nfs_sillyrename() to set it up 1840 * else 1841 * do the remove rpc 1842 * 1843 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1844 * struct componentname *a_cnp) 1845 */ 1846 static int 1847 nfs_remove(struct vop_old_remove_args *ap) 1848 { 1849 struct vnode *vp = ap->a_vp; 1850 struct vnode *dvp = ap->a_dvp; 1851 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 1852 struct componentname *cnp = ap->a_cnp; 1853 struct nfsnode *np = VTONFS(vp); 1854 int error = 0; 1855 struct vattr vattr; 1856 1857 lwkt_gettoken(&nmp->nm_token); 1858 #ifndef DIAGNOSTIC 1859 if (VREFCNT(vp) < 1) 1860 panic("nfs_remove: bad v_refcnt"); 1861 #endif 1862 if (vp->v_type == VDIR) { 1863 error = EPERM; 1864 } else if (VREFCNT(vp) == 1 || (np->n_sillyrename && 1865 VOP_GETATTR(vp, &vattr) == 0 && vattr.va_nlink > 1)) { 1866 /* 1867 * Force finalization so the VOP_INACTIVE() call is not delayed. 1868 * This prevents cred structures from building up in nfsnodes 1869 * for deleted files. 1870 */ 1871 atomic_set_int(&vp->v_refcnt, VREF_FINALIZE); 1872 np->n_flag |= NREMOVED; 1873 1874 /* 1875 * Throw away biocache buffers, mainly to avoid 1876 * unnecessary delayed writes later. 1877 */ 1878 error = nfs_vinvalbuf(vp, 0, 1); 1879 /* Do the rpc */ 1880 if (error != EINTR) { 1881 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1882 cnp->cn_namelen, 1883 cnp->cn_cred, cnp->cn_td); 1884 } 1885 1886 /* 1887 * Kludge City: If the first reply to the remove rpc is lost.. 1888 * the reply to the retransmitted request will be ENOENT 1889 * since the file was in fact removed 1890 * Therefore, we cheat and return success. 1891 */ 1892 if (error == ENOENT) 1893 error = 0; 1894 } else if (!np->n_sillyrename) { 1895 error = nfs_sillyrename(dvp, vp, cnp); 1896 } 1897 np->n_attrstamp = 0; 1898 lwkt_reltoken(&nmp->nm_token); 1899 if (error == 0) { 1900 nfs_knote(vp, NOTE_DELETE); 1901 nfs_knote(dvp, NOTE_WRITE); 1902 } 1903 1904 return (error); 1905 } 1906 1907 /* 1908 * nfs file remove rpc called from nfs_inactive 1909 * 1910 * NOTE: s_dvp can be VBAD during a forced unmount. 1911 */ 1912 int 1913 nfs_removeit(struct sillyrename *sp) 1914 { 1915 if (sp->s_dvp->v_type == VBAD) 1916 return(0); 1917 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1918 sp->s_cred, NULL)); 1919 } 1920 1921 /* 1922 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1923 */ 1924 static int 1925 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1926 struct ucred *cred, struct thread *td) 1927 { 1928 int error = 0, wccflag = NFSV3_WCCRATTR; 1929 struct nfsm_info info; 1930 1931 info.mrep = NULL; 1932 info.v3 = NFS_ISV3(dvp); 1933 1934 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1935 nfsm_reqhead(&info, dvp, NFSPROC_REMOVE, 1936 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1937 ERROROUT(nfsm_fhtom(&info, dvp)); 1938 ERROROUT(nfsm_strtom(&info, name, namelen, NFS_MAXNAMLEN)); 1939 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_REMOVE, td, cred, &error)); 1940 if (info.v3) { 1941 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1942 } 1943 m_freem(info.mrep); 1944 info.mrep = NULL; 1945 nfsmout: 1946 VTONFS(dvp)->n_flag |= NLMODIFIED; 1947 if (!wccflag) 1948 VTONFS(dvp)->n_attrstamp = 0; 1949 return (error); 1950 } 1951 1952 /* 1953 * nfs file rename call 1954 * 1955 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1956 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1957 * struct vnode *a_tvp, struct componentname *a_tcnp) 1958 */ 1959 static int 1960 nfs_rename(struct vop_old_rename_args *ap) 1961 { 1962 struct vnode *fvp = ap->a_fvp; 1963 struct vnode *tvp = ap->a_tvp; 1964 struct vnode *fdvp = ap->a_fdvp; 1965 struct vnode *tdvp = ap->a_tdvp; 1966 struct componentname *tcnp = ap->a_tcnp; 1967 struct componentname *fcnp = ap->a_fcnp; 1968 struct nfsmount *nmp = VFSTONFS(fdvp->v_mount); 1969 int error; 1970 1971 lwkt_gettoken(&nmp->nm_token); 1972 1973 /* 1974 * Force finalization so the VOP_INACTIVE() call is not delayed. 1975 * This prevents cred structures from building up in nfsnodes 1976 * for deleted files. 1977 */ 1978 if (tvp) { 1979 atomic_set_int(&tvp->v_refcnt, VREF_FINALIZE); 1980 if (VTONFS(tvp)) 1981 VTONFS(tvp)->n_flag |= NREMOVED; 1982 } 1983 1984 /* Check for cross-device rename */ 1985 if ((fvp->v_mount != tdvp->v_mount) || 1986 (tvp && (fvp->v_mount != tvp->v_mount))) { 1987 error = EXDEV; 1988 goto out; 1989 } 1990 1991 /* 1992 * We shouldn't have to flush fvp on rename for most server-side 1993 * filesystems as the file handle should not change. Unfortunately 1994 * the inode for some filesystems (msdosfs) might be tied to the 1995 * file name or directory position so to be completely safe 1996 * vfs.nfs.flush_on_rename is set by default. Clear to improve 1997 * performance. 1998 * 1999 * We must flush tvp on rename because it might become stale on the 2000 * server after the rename. 2001 */ 2002 if (nfs_flush_on_rename) 2003 VOP_FSYNC(fvp, MNT_WAIT, 0); 2004 if (tvp) 2005 VOP_FSYNC(tvp, MNT_WAIT, 0); 2006 2007 /* 2008 * If the tvp exists and is in use, sillyrename it before doing the 2009 * rename of the new file over it. 2010 * 2011 * XXX Can't sillyrename a directory. 2012 * 2013 * We do not attempt to do any namecache purges in this old API 2014 * routine. The new API compat functions have access to the actual 2015 * namecache structures and will do it for us. 2016 */ 2017 if (tvp && VREFCNT(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2018 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2019 nfs_knote(tvp, NOTE_DELETE); 2020 vput(tvp); 2021 tvp = NULL; 2022 } else if (tvp) { 2023 nfs_knote(tvp, NOTE_DELETE); 2024 } 2025 2026 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2027 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2028 tcnp->cn_td); 2029 2030 out: 2031 if (error == 0) { 2032 nfs_knote(fdvp, NOTE_WRITE); 2033 nfs_knote(tdvp, NOTE_WRITE); 2034 nfs_knote(fvp, NOTE_RENAME); 2035 } 2036 lwkt_reltoken(&nmp->nm_token); 2037 if (tdvp == tvp) 2038 vrele(tdvp); 2039 else 2040 vput(tdvp); 2041 if (tvp) 2042 vput(tvp); 2043 vrele(fdvp); 2044 vrele(fvp); 2045 /* 2046 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2047 */ 2048 if (error == ENOENT) 2049 error = 0; 2050 return (error); 2051 } 2052 2053 /* 2054 * nfs file rename rpc called from nfs_remove() above 2055 */ 2056 static int 2057 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 2058 struct sillyrename *sp) 2059 { 2060 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 2061 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 2062 } 2063 2064 /* 2065 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2066 */ 2067 static int 2068 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 2069 struct vnode *tdvp, const char *tnameptr, int tnamelen, 2070 struct ucred *cred, struct thread *td) 2071 { 2072 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 2073 struct nfsm_info info; 2074 2075 info.mrep = NULL; 2076 info.v3 = NFS_ISV3(fdvp); 2077 2078 nfsstats.rpccnt[NFSPROC_RENAME]++; 2079 nfsm_reqhead(&info, fdvp, NFSPROC_RENAME, 2080 (NFSX_FH(info.v3) + NFSX_UNSIGNED)*2 + 2081 nfsm_rndup(fnamelen) + nfsm_rndup(tnamelen)); 2082 ERROROUT(nfsm_fhtom(&info, fdvp)); 2083 ERROROUT(nfsm_strtom(&info, fnameptr, fnamelen, NFS_MAXNAMLEN)); 2084 ERROROUT(nfsm_fhtom(&info, tdvp)); 2085 ERROROUT(nfsm_strtom(&info, tnameptr, tnamelen, NFS_MAXNAMLEN)); 2086 NEGKEEPOUT(nfsm_request(&info, fdvp, NFSPROC_RENAME, td, cred, &error)); 2087 if (info.v3) { 2088 ERROROUT(nfsm_wcc_data(&info, fdvp, &fwccflag)); 2089 ERROROUT(nfsm_wcc_data(&info, tdvp, &twccflag)); 2090 } 2091 m_freem(info.mrep); 2092 info.mrep = NULL; 2093 nfsmout: 2094 VTONFS(fdvp)->n_flag |= NLMODIFIED; 2095 VTONFS(tdvp)->n_flag |= NLMODIFIED; 2096 if (!fwccflag) 2097 VTONFS(fdvp)->n_attrstamp = 0; 2098 if (!twccflag) 2099 VTONFS(tdvp)->n_attrstamp = 0; 2100 return (error); 2101 } 2102 2103 /* 2104 * nfs hard link create call 2105 * 2106 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 2107 * struct componentname *a_cnp) 2108 */ 2109 static int 2110 nfs_link(struct vop_old_link_args *ap) 2111 { 2112 struct vnode *vp = ap->a_vp; 2113 struct vnode *tdvp = ap->a_tdvp; 2114 struct nfsmount *nmp = VFSTONFS(tdvp->v_mount); 2115 struct componentname *cnp = ap->a_cnp; 2116 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2117 struct nfsm_info info; 2118 2119 if (vp->v_mount != tdvp->v_mount) { 2120 return (EXDEV); 2121 } 2122 lwkt_gettoken(&nmp->nm_token); 2123 2124 /* 2125 * The attribute cache may get out of sync with the server on link. 2126 * Pushing writes to the server before handle was inherited from 2127 * long long ago and it is unclear if we still need to do this. 2128 * Defaults to off. 2129 */ 2130 if (nfs_flush_on_hlink) 2131 VOP_FSYNC(vp, MNT_WAIT, 0); 2132 2133 info.mrep = NULL; 2134 info.v3 = NFS_ISV3(vp); 2135 2136 nfsstats.rpccnt[NFSPROC_LINK]++; 2137 nfsm_reqhead(&info, vp, NFSPROC_LINK, 2138 NFSX_FH(info.v3) * 2 + NFSX_UNSIGNED + 2139 nfsm_rndup(cnp->cn_namelen)); 2140 ERROROUT(nfsm_fhtom(&info, vp)); 2141 ERROROUT(nfsm_fhtom(&info, tdvp)); 2142 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2143 NFS_MAXNAMLEN)); 2144 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_LINK, cnp->cn_td, 2145 cnp->cn_cred, &error)); 2146 if (info.v3) { 2147 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2148 NFS_LATTR_NOSHRINK)); 2149 ERROROUT(nfsm_wcc_data(&info, tdvp, &wccflag)); 2150 } 2151 m_freem(info.mrep); 2152 info.mrep = NULL; 2153 nfsmout: 2154 VTONFS(tdvp)->n_flag |= NLMODIFIED; 2155 if (!attrflag) 2156 VTONFS(vp)->n_attrstamp = 0; 2157 if (!wccflag) 2158 VTONFS(tdvp)->n_attrstamp = 0; 2159 /* 2160 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2161 */ 2162 if (error == EEXIST) 2163 error = 0; 2164 lwkt_reltoken(&nmp->nm_token); 2165 if (error == 0) { 2166 nfs_knote(vp, NOTE_LINK); 2167 nfs_knote(tdvp, NOTE_WRITE); 2168 } 2169 2170 return (error); 2171 } 2172 2173 /* 2174 * nfs symbolic link create call 2175 * 2176 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 2177 * struct componentname *a_cnp, struct vattr *a_vap, 2178 * char *a_target) 2179 */ 2180 static int 2181 nfs_symlink(struct vop_old_symlink_args *ap) 2182 { 2183 struct vnode *dvp = ap->a_dvp; 2184 struct vattr *vap = ap->a_vap; 2185 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2186 struct componentname *cnp = ap->a_cnp; 2187 struct nfsv2_sattr *sp; 2188 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2189 struct vnode *newvp = NULL; 2190 struct nfsm_info info; 2191 2192 info.mrep = NULL; 2193 info.v3 = NFS_ISV3(dvp); 2194 lwkt_gettoken(&nmp->nm_token); 2195 2196 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2197 slen = strlen(ap->a_target); 2198 nfsm_reqhead(&info, dvp, NFSPROC_SYMLINK, 2199 NFSX_FH(info.v3) + 2*NFSX_UNSIGNED + 2200 nfsm_rndup(cnp->cn_namelen) + 2201 nfsm_rndup(slen) + NFSX_SATTR(info.v3)); 2202 ERROROUT(nfsm_fhtom(&info, dvp)); 2203 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2204 NFS_MAXNAMLEN)); 2205 if (info.v3) { 2206 nfsm_v3attrbuild(&info, vap, FALSE); 2207 } 2208 ERROROUT(nfsm_strtom(&info, ap->a_target, slen, NFS_MAXPATHLEN)); 2209 if (info.v3 == 0) { 2210 sp = nfsm_build(&info, NFSX_V2SATTR); 2211 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2212 sp->sa_uid = nfs_xdrneg1; 2213 sp->sa_gid = nfs_xdrneg1; 2214 sp->sa_size = nfs_xdrneg1; 2215 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2216 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2217 } 2218 2219 /* 2220 * Issue the NFS request and get the rpc response. 2221 * 2222 * Only NFSv3 responses returning an error of 0 actually return 2223 * a file handle that can be converted into newvp without having 2224 * to do an extra lookup rpc. 2225 */ 2226 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_SYMLINK, cnp->cn_td, 2227 cnp->cn_cred, &error)); 2228 if (info.v3) { 2229 if (error == 0) { 2230 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2231 } 2232 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2233 } 2234 2235 /* 2236 * out code jumps -> here, mrep is also freed. 2237 */ 2238 2239 m_freem(info.mrep); 2240 info.mrep = NULL; 2241 nfsmout: 2242 2243 /* 2244 * If we get an EEXIST error, silently convert it to no-error 2245 * in case of an NFS retry. 2246 */ 2247 if (error == EEXIST) 2248 error = 0; 2249 2250 /* 2251 * If we do not have (or no longer have) an error, and we could 2252 * not extract the newvp from the response due to the request being 2253 * NFSv2 or the error being EEXIST. We have to do a lookup in order 2254 * to obtain a newvp to return. 2255 */ 2256 if (error == 0 && newvp == NULL) { 2257 struct nfsnode *np = NULL; 2258 2259 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2260 cnp->cn_cred, cnp->cn_td, &np); 2261 if (!error) 2262 newvp = NFSTOV(np); 2263 } 2264 if (error) { 2265 if (newvp) 2266 vput(newvp); 2267 } else { 2268 *ap->a_vpp = newvp; 2269 } 2270 VTONFS(dvp)->n_flag |= NLMODIFIED; 2271 if (!wccflag) 2272 VTONFS(dvp)->n_attrstamp = 0; 2273 if (error == 0 && *ap->a_vpp) 2274 nfs_knote(*ap->a_vpp, NOTE_WRITE); 2275 lwkt_reltoken(&nmp->nm_token); 2276 2277 return (error); 2278 } 2279 2280 /* 2281 * nfs make dir call 2282 * 2283 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 2284 * struct componentname *a_cnp, struct vattr *a_vap) 2285 */ 2286 static int 2287 nfs_mkdir(struct vop_old_mkdir_args *ap) 2288 { 2289 struct vnode *dvp = ap->a_dvp; 2290 struct vattr *vap = ap->a_vap; 2291 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2292 struct componentname *cnp = ap->a_cnp; 2293 struct nfsv2_sattr *sp; 2294 struct nfsnode *np = NULL; 2295 struct vnode *newvp = NULL; 2296 struct vattr vattr; 2297 int error = 0, wccflag = NFSV3_WCCRATTR; 2298 int gotvp = 0; 2299 int len; 2300 struct nfsm_info info; 2301 2302 info.mrep = NULL; 2303 info.v3 = NFS_ISV3(dvp); 2304 lwkt_gettoken(&nmp->nm_token); 2305 2306 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 2307 lwkt_reltoken(&nmp->nm_token); 2308 return (error); 2309 } 2310 len = cnp->cn_namelen; 2311 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2312 nfsm_reqhead(&info, dvp, NFSPROC_MKDIR, 2313 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2314 nfsm_rndup(len) + NFSX_SATTR(info.v3)); 2315 ERROROUT(nfsm_fhtom(&info, dvp)); 2316 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 2317 if (info.v3) { 2318 nfsm_v3attrbuild(&info, vap, FALSE); 2319 } else { 2320 sp = nfsm_build(&info, NFSX_V2SATTR); 2321 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2322 sp->sa_uid = nfs_xdrneg1; 2323 sp->sa_gid = nfs_xdrneg1; 2324 sp->sa_size = nfs_xdrneg1; 2325 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2326 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2327 } 2328 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKDIR, cnp->cn_td, 2329 cnp->cn_cred, &error)); 2330 if (error == 0) { 2331 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2332 } 2333 if (info.v3) { 2334 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2335 } 2336 m_freem(info.mrep); 2337 info.mrep = NULL; 2338 nfsmout: 2339 VTONFS(dvp)->n_flag |= NLMODIFIED; 2340 if (!wccflag) 2341 VTONFS(dvp)->n_attrstamp = 0; 2342 /* 2343 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2344 * if we can succeed in looking up the directory. 2345 */ 2346 if (error == EEXIST || (!error && !gotvp)) { 2347 if (newvp) { 2348 vrele(newvp); 2349 newvp = NULL; 2350 } 2351 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2352 cnp->cn_td, &np); 2353 if (!error) { 2354 newvp = NFSTOV(np); 2355 if (newvp->v_type != VDIR) 2356 error = EEXIST; 2357 } 2358 } 2359 if (error) { 2360 if (newvp) 2361 vrele(newvp); 2362 } else { 2363 nfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 2364 *ap->a_vpp = newvp; 2365 } 2366 lwkt_reltoken(&nmp->nm_token); 2367 return (error); 2368 } 2369 2370 /* 2371 * nfs remove directory call 2372 * 2373 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2374 * struct componentname *a_cnp) 2375 */ 2376 static int 2377 nfs_rmdir(struct vop_old_rmdir_args *ap) 2378 { 2379 struct vnode *vp = ap->a_vp; 2380 struct vnode *dvp = ap->a_dvp; 2381 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2382 struct componentname *cnp = ap->a_cnp; 2383 int error = 0, wccflag = NFSV3_WCCRATTR; 2384 struct nfsm_info info; 2385 2386 info.mrep = NULL; 2387 info.v3 = NFS_ISV3(dvp); 2388 2389 if (dvp == vp) 2390 return (EINVAL); 2391 2392 lwkt_gettoken(&nmp->nm_token); 2393 2394 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2395 nfsm_reqhead(&info, dvp, NFSPROC_RMDIR, 2396 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2397 nfsm_rndup(cnp->cn_namelen)); 2398 ERROROUT(nfsm_fhtom(&info, dvp)); 2399 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2400 NFS_MAXNAMLEN)); 2401 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_RMDIR, cnp->cn_td, 2402 cnp->cn_cred, &error)); 2403 if (info.v3) { 2404 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2405 } 2406 m_freem(info.mrep); 2407 info.mrep = NULL; 2408 nfsmout: 2409 VTONFS(dvp)->n_flag |= NLMODIFIED; 2410 if (!wccflag) 2411 VTONFS(dvp)->n_attrstamp = 0; 2412 /* 2413 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2414 */ 2415 if (error == ENOENT) 2416 error = 0; 2417 else 2418 nfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 2419 lwkt_reltoken(&nmp->nm_token); 2420 2421 return (error); 2422 } 2423 2424 /* 2425 * nfs readdir call 2426 * 2427 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2428 */ 2429 static int 2430 nfs_readdir(struct vop_readdir_args *ap) 2431 { 2432 struct vnode *vp = ap->a_vp; 2433 struct nfsnode *np = VTONFS(vp); 2434 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2435 struct uio *uio = ap->a_uio; 2436 int tresid, error; 2437 struct vattr vattr; 2438 2439 if (vp->v_type != VDIR) 2440 return (EPERM); 2441 2442 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM); 2443 if (error) 2444 return (error); 2445 2446 lwkt_gettoken(&nmp->nm_token); 2447 2448 /* 2449 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2450 * and then check that is still valid, or if this is an NQNFS mount 2451 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2452 * VOP_GETATTR() does not necessarily go to the wire. 2453 */ 2454 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2455 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2456 if (VOP_GETATTR(vp, &vattr) == 0 && 2457 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2458 ) { 2459 nfsstats.direofcache_hits++; 2460 goto done; 2461 } 2462 } 2463 2464 /* 2465 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2466 * own cache coherency checks so we do not have to. 2467 */ 2468 tresid = uio->uio_resid; 2469 error = nfs_bioread(vp, uio, 0); 2470 2471 if (!error && uio->uio_resid == tresid) 2472 nfsstats.direofcache_misses++; 2473 done: 2474 lwkt_reltoken(&nmp->nm_token); 2475 vn_unlock(vp); 2476 2477 return (error); 2478 } 2479 2480 /* 2481 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2482 * 2483 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2484 * offset/block and converts the nfs formatted directory entries for userland 2485 * consumption as well as deals with offsets into the middle of blocks. 2486 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2487 * be block-bounded. It must convert to cookies for the actual RPC. 2488 */ 2489 int 2490 nfs_readdirrpc_uio(struct vnode *vp, struct uio *uiop) 2491 { 2492 int len, left; 2493 struct nfs_dirent *dp = NULL; 2494 u_int32_t *tl; 2495 nfsuint64 *cookiep; 2496 caddr_t cp; 2497 nfsuint64 cookie; 2498 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2499 struct nfsnode *dnp = VTONFS(vp); 2500 u_quad_t fileno; 2501 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2502 int attrflag; 2503 struct nfsm_info info; 2504 2505 info.mrep = NULL; 2506 info.v3 = NFS_ISV3(vp); 2507 2508 #ifndef DIAGNOSTIC 2509 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2510 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2511 panic("nfs readdirrpc bad uio"); 2512 #endif 2513 2514 /* 2515 * If there is no cookie, assume directory was stale. 2516 */ 2517 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2518 if (cookiep) 2519 cookie = *cookiep; 2520 else 2521 return (NFSERR_BAD_COOKIE); 2522 /* 2523 * Loop around doing readdir rpc's of size nm_readdirsize 2524 * truncated to a multiple of DIRBLKSIZ. 2525 * The stopping criteria is EOF or buffer full. 2526 */ 2527 while (more_dirs && bigenough) { 2528 nfsstats.rpccnt[NFSPROC_READDIR]++; 2529 nfsm_reqhead(&info, vp, NFSPROC_READDIR, 2530 NFSX_FH(info.v3) + NFSX_READDIR(info.v3)); 2531 ERROROUT(nfsm_fhtom(&info, vp)); 2532 if (info.v3) { 2533 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 2534 *tl++ = cookie.nfsuquad[0]; 2535 *tl++ = cookie.nfsuquad[1]; 2536 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2537 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2538 } else { 2539 /* 2540 * WARNING! HAMMER DIRECTORIES WILL NOT WORK WELL 2541 * WITH NFSv2!!! There's nothing I can really do 2542 * about it other than to hope the server supports 2543 * rdirplus w/NFSv2. 2544 */ 2545 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 2546 *tl++ = cookie.nfsuquad[0]; 2547 } 2548 *tl = txdr_unsigned(nmp->nm_readdirsize); 2549 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIR, 2550 uiop->uio_td, 2551 nfs_vpcred(vp, ND_READ), &error)); 2552 if (info.v3) { 2553 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2554 NFS_LATTR_NOSHRINK)); 2555 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2556 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2557 dnp->n_cookieverf.nfsuquad[1] = *tl; 2558 } 2559 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2560 more_dirs = fxdr_unsigned(int, *tl); 2561 2562 /* loop thru the dir entries, converting them to std form */ 2563 while (more_dirs && bigenough) { 2564 if (info.v3) { 2565 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2566 fileno = fxdr_hyper(tl); 2567 len = fxdr_unsigned(int, *(tl + 2)); 2568 } else { 2569 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2570 fileno = fxdr_unsigned(u_quad_t, *tl++); 2571 len = fxdr_unsigned(int, *tl); 2572 } 2573 if (len <= 0 || len > NFS_MAXNAMLEN) { 2574 error = EBADRPC; 2575 m_freem(info.mrep); 2576 info.mrep = NULL; 2577 goto nfsmout; 2578 } 2579 2580 /* 2581 * len is the number of bytes in the path element 2582 * name, not including the \0 termination. 2583 * 2584 * tlen is the number of bytes w have to reserve for 2585 * the path element name. 2586 */ 2587 tlen = nfsm_rndup(len); 2588 if (tlen == len) 2589 tlen += 4; /* To ensure null termination */ 2590 2591 /* 2592 * If the entry would cross a DIRBLKSIZ boundary, 2593 * extend the previous nfs_dirent to cover the 2594 * remaining space. 2595 */ 2596 left = DIRBLKSIZ - blksiz; 2597 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2598 dp->nfs_reclen += left; 2599 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2600 uiop->uio_iov->iov_len -= left; 2601 uiop->uio_offset += left; 2602 uiop->uio_resid -= left; 2603 blksiz = 0; 2604 } 2605 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2606 bigenough = 0; 2607 if (bigenough) { 2608 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2609 dp->nfs_ino = fileno; 2610 dp->nfs_namlen = len; 2611 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2612 dp->nfs_type = DT_UNKNOWN; 2613 blksiz += dp->nfs_reclen; 2614 if (blksiz == DIRBLKSIZ) 2615 blksiz = 0; 2616 uiop->uio_offset += sizeof(struct nfs_dirent); 2617 uiop->uio_resid -= sizeof(struct nfs_dirent); 2618 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2619 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2620 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2621 2622 /* 2623 * The uiop has advanced by nfs_dirent + len 2624 * but really needs to advance by 2625 * nfs_dirent + tlen 2626 */ 2627 cp = uiop->uio_iov->iov_base; 2628 tlen -= len; 2629 *cp = '\0'; /* null terminate */ 2630 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2631 uiop->uio_iov->iov_len -= tlen; 2632 uiop->uio_offset += tlen; 2633 uiop->uio_resid -= tlen; 2634 } else { 2635 /* 2636 * NFS strings must be rounded up (nfsm_myouio 2637 * handled that in the bigenough case). 2638 */ 2639 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2640 } 2641 if (info.v3) { 2642 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2643 } else { 2644 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2645 } 2646 2647 /* 2648 * If we were able to accomodate the last entry, 2649 * get the cookie for the next one. Otherwise 2650 * hold-over the cookie for the one we were not 2651 * able to accomodate. 2652 */ 2653 if (bigenough) { 2654 cookie.nfsuquad[0] = *tl++; 2655 if (info.v3) 2656 cookie.nfsuquad[1] = *tl++; 2657 } else if (info.v3) { 2658 tl += 2; 2659 } else { 2660 tl++; 2661 } 2662 more_dirs = fxdr_unsigned(int, *tl); 2663 } 2664 /* 2665 * If at end of rpc data, get the eof boolean 2666 */ 2667 if (!more_dirs) { 2668 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2669 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2670 } 2671 m_freem(info.mrep); 2672 info.mrep = NULL; 2673 } 2674 /* 2675 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2676 * by increasing d_reclen for the last record. 2677 */ 2678 if (blksiz > 0) { 2679 left = DIRBLKSIZ - blksiz; 2680 dp->nfs_reclen += left; 2681 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2682 uiop->uio_iov->iov_len -= left; 2683 uiop->uio_offset += left; 2684 uiop->uio_resid -= left; 2685 } 2686 2687 if (bigenough) { 2688 /* 2689 * We hit the end of the directory, update direofoffset. 2690 */ 2691 dnp->n_direofoffset = uiop->uio_offset; 2692 } else { 2693 /* 2694 * There is more to go, insert the link cookie so the 2695 * next block can be read. 2696 */ 2697 if (uiop->uio_resid > 0) 2698 kprintf("EEK! readdirrpc resid > 0\n"); 2699 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2700 *cookiep = cookie; 2701 } 2702 nfsmout: 2703 return (error); 2704 } 2705 2706 /* 2707 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2708 */ 2709 int 2710 nfs_readdirplusrpc_uio(struct vnode *vp, struct uio *uiop) 2711 { 2712 int len, left; 2713 struct nfs_dirent *dp; 2714 u_int32_t *tl; 2715 struct vnode *newvp; 2716 nfsuint64 *cookiep; 2717 caddr_t dpossav1, dpossav2; 2718 caddr_t cp; 2719 struct mbuf *mdsav1, *mdsav2; 2720 nfsuint64 cookie; 2721 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2722 struct nfsnode *dnp = VTONFS(vp), *np; 2723 nfsfh_t *fhp; 2724 u_quad_t fileno; 2725 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2726 int attrflag, fhsize; 2727 struct nchandle nch; 2728 struct nchandle dnch; 2729 struct nlcomponent nlc; 2730 struct nfsm_info info; 2731 2732 info.mrep = NULL; 2733 info.v3 = 1; 2734 2735 #ifndef nolint 2736 dp = NULL; 2737 #endif 2738 #ifndef DIAGNOSTIC 2739 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2740 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2741 panic("nfs readdirplusrpc bad uio"); 2742 #endif 2743 /* 2744 * Obtain the namecache record for the directory so we have something 2745 * to use as a basis for creating the entries. This function will 2746 * return a held (but not locked) ncp. The ncp may be disconnected 2747 * from the tree and cannot be used for upward traversals, and the 2748 * ncp may be unnamed. Note that other unrelated operations may 2749 * cause the ncp to be named at any time. 2750 * 2751 * We have to lock the ncp to prevent a lock order reversal when 2752 * rdirplus does nlookups of the children, because the vnode is 2753 * locked and has to stay that way. 2754 */ 2755 cache_fromdvp(vp, NULL, 0, &dnch); 2756 bzero(&nlc, sizeof(nlc)); 2757 newvp = NULLVP; 2758 2759 /* 2760 * If there is no cookie, assume directory was stale. 2761 */ 2762 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2763 if (cookiep) { 2764 cookie = *cookiep; 2765 } else { 2766 if (dnch.ncp) 2767 cache_drop(&dnch); 2768 return (NFSERR_BAD_COOKIE); 2769 } 2770 2771 /* 2772 * Loop around doing readdir rpc's of size nm_readdirsize 2773 * truncated to a multiple of DIRBLKSIZ. 2774 * The stopping criteria is EOF or buffer full. 2775 */ 2776 while (more_dirs && bigenough) { 2777 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2778 nfsm_reqhead(&info, vp, NFSPROC_READDIRPLUS, 2779 NFSX_FH(info.v3) + 6 * NFSX_UNSIGNED); 2780 ERROROUT(nfsm_fhtom(&info, vp)); 2781 tl = nfsm_build(&info, 6 * NFSX_UNSIGNED); 2782 *tl++ = cookie.nfsuquad[0]; 2783 *tl++ = cookie.nfsuquad[1]; 2784 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2785 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2786 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2787 *tl = txdr_unsigned(nmp->nm_rsize); 2788 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIRPLUS, 2789 uiop->uio_td, 2790 nfs_vpcred(vp, ND_READ), &error)); 2791 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2792 NFS_LATTR_NOSHRINK)); 2793 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2794 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2795 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2796 more_dirs = fxdr_unsigned(int, *tl); 2797 2798 /* loop thru the dir entries, doctoring them to 4bsd form */ 2799 while (more_dirs && bigenough) { 2800 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2801 fileno = fxdr_hyper(tl); 2802 len = fxdr_unsigned(int, *(tl + 2)); 2803 if (len <= 0 || len > NFS_MAXNAMLEN) { 2804 error = EBADRPC; 2805 m_freem(info.mrep); 2806 info.mrep = NULL; 2807 goto nfsmout; 2808 } 2809 tlen = nfsm_rndup(len); 2810 if (tlen == len) 2811 tlen += 4; /* To ensure null termination*/ 2812 left = DIRBLKSIZ - blksiz; 2813 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2814 dp->nfs_reclen += left; 2815 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2816 uiop->uio_iov->iov_len -= left; 2817 uiop->uio_offset += left; 2818 uiop->uio_resid -= left; 2819 blksiz = 0; 2820 } 2821 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2822 bigenough = 0; 2823 if (bigenough) { 2824 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2825 dp->nfs_ino = fileno; 2826 dp->nfs_namlen = len; 2827 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2828 dp->nfs_type = DT_UNKNOWN; 2829 blksiz += dp->nfs_reclen; 2830 if (blksiz == DIRBLKSIZ) 2831 blksiz = 0; 2832 uiop->uio_offset += sizeof(struct nfs_dirent); 2833 uiop->uio_resid -= sizeof(struct nfs_dirent); 2834 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2835 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2836 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2837 nlc.nlc_namelen = len; 2838 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2839 cp = uiop->uio_iov->iov_base; 2840 tlen -= len; 2841 *cp = '\0'; 2842 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2843 uiop->uio_iov->iov_len -= tlen; 2844 uiop->uio_offset += tlen; 2845 uiop->uio_resid -= tlen; 2846 } else { 2847 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2848 } 2849 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2850 if (bigenough) { 2851 cookie.nfsuquad[0] = *tl++; 2852 cookie.nfsuquad[1] = *tl++; 2853 } else { 2854 tl += 2; 2855 } 2856 2857 /* 2858 * Since the attributes are before the file handle 2859 * (sigh), we must skip over the attributes and then 2860 * come back and get them. 2861 */ 2862 attrflag = fxdr_unsigned(int, *tl); 2863 if (attrflag) { 2864 dpossav1 = info.dpos; 2865 mdsav1 = info.md; 2866 ERROROUT(nfsm_adv(&info, NFSX_V3FATTR)); 2867 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2868 doit = fxdr_unsigned(int, *tl); 2869 if (doit) { 2870 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 2871 } 2872 if (doit && bigenough && !nlcdegenerate(&nlc) && 2873 !NFS_CMPFH(dnp, fhp, fhsize) 2874 ) { 2875 if (dnch.ncp) { 2876 #if 0 2877 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2878 nlc.nlc_namelen, nlc.nlc_namelen, 2879 nlc.nlc_nameptr); 2880 #endif 2881 /* 2882 * This is a bit hokey but there isn't 2883 * much we can do about it. We can't 2884 * hold the directory vp locked while 2885 * doing lookups and gets. 2886 */ 2887 nch = cache_nlookup_nonblock(&dnch, &nlc); 2888 if (nch.ncp == NULL) 2889 goto rdfail; 2890 cache_setunresolved(&nch); 2891 error = nfs_nget_nonblock(vp->v_mount, fhp, 2892 fhsize, &np, 2893 NULL); 2894 if (error) { 2895 cache_put(&nch); 2896 goto rdfail; 2897 } 2898 newvp = NFSTOV(np); 2899 dpossav2 = info.dpos; 2900 info.dpos = dpossav1; 2901 mdsav2 = info.md; 2902 info.md = mdsav1; 2903 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 2904 info.dpos = dpossav2; 2905 info.md = mdsav2; 2906 dp->nfs_type = 2907 IFTODT(VTTOIF(np->n_vattr.va_type)); 2908 nfs_cache_setvp(&nch, newvp, 2909 nfspos_cache_timeout); 2910 vput(newvp); 2911 newvp = NULLVP; 2912 cache_put(&nch); 2913 } else { 2914 rdfail: 2915 ; 2916 #if 0 2917 kprintf("Warning: NFS/rddirplus, " 2918 "UNABLE TO ENTER %*.*s\n", 2919 nlc.nlc_namelen, nlc.nlc_namelen, 2920 nlc.nlc_nameptr); 2921 #endif 2922 } 2923 } 2924 } else { 2925 /* Just skip over the file handle */ 2926 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2927 i = fxdr_unsigned(int, *tl); 2928 ERROROUT(nfsm_adv(&info, nfsm_rndup(i))); 2929 } 2930 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2931 more_dirs = fxdr_unsigned(int, *tl); 2932 } 2933 /* 2934 * If at end of rpc data, get the eof boolean 2935 */ 2936 if (!more_dirs) { 2937 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2938 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2939 } 2940 m_freem(info.mrep); 2941 info.mrep = NULL; 2942 } 2943 /* 2944 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2945 * by increasing d_reclen for the last record. 2946 */ 2947 if (blksiz > 0) { 2948 left = DIRBLKSIZ - blksiz; 2949 dp->nfs_reclen += left; 2950 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2951 uiop->uio_iov->iov_len -= left; 2952 uiop->uio_offset += left; 2953 uiop->uio_resid -= left; 2954 } 2955 2956 /* 2957 * We are now either at the end of the directory or have filled the 2958 * block. 2959 */ 2960 if (bigenough) { 2961 dnp->n_direofoffset = uiop->uio_offset; 2962 } else { 2963 if (uiop->uio_resid > 0) 2964 kprintf("EEK! readdirplusrpc resid > 0\n"); 2965 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2966 *cookiep = cookie; 2967 } 2968 nfsmout: 2969 if (newvp != NULLVP) { 2970 if (newvp == vp) 2971 vrele(newvp); 2972 else 2973 vput(newvp); 2974 newvp = NULLVP; 2975 } 2976 if (dnch.ncp) 2977 cache_drop(&dnch); 2978 return (error); 2979 } 2980 2981 /* 2982 * Silly rename. To make the NFS filesystem that is stateless look a little 2983 * more like the "ufs" a remove of an active vnode is translated to a rename 2984 * to a funny looking filename that is removed by nfs_inactive on the 2985 * nfsnode. There is the potential for another process on a different client 2986 * to create the same funny name between the nfs_lookitup() fails and the 2987 * nfs_rename() completes, but... 2988 */ 2989 static int 2990 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2991 { 2992 struct sillyrename *sp; 2993 struct nfsnode *np; 2994 int error; 2995 2996 /* 2997 * Force finalization so the VOP_INACTIVE() call is not delayed. 2998 * This prevents cred structures from building up in nfsnodes 2999 * for deleted files. 3000 */ 3001 atomic_set_int(&vp->v_refcnt, VREF_FINALIZE); 3002 np = VTONFS(vp); 3003 np->n_flag |= NREMOVED; 3004 3005 /* 3006 * We previously purged dvp instead of vp. I don't know why, it 3007 * completely destroys performance. We can't do it anyway with the 3008 * new VFS API since we would be breaking the namecache topology. 3009 */ 3010 cache_purge(vp); /* XXX */ 3011 #ifndef DIAGNOSTIC 3012 if (vp->v_type == VDIR) 3013 panic("nfs: sillyrename dir"); 3014 #endif 3015 sp = kmalloc(sizeof(struct sillyrename), M_NFSREQ, M_WAITOK); 3016 sp->s_cred = crdup(cnp->cn_cred); 3017 sp->s_dvp = dvp; 3018 vref(dvp); 3019 3020 /* Fudge together a funny name */ 3021 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", 3022 (int)(intptr_t)cnp->cn_td); 3023 3024 /* Try lookitups until we get one that isn't there */ 3025 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3026 cnp->cn_td, NULL) == 0) { 3027 sp->s_name[4]++; 3028 if (sp->s_name[4] > 'z') { 3029 error = EINVAL; 3030 goto bad; 3031 } 3032 } 3033 error = nfs_renameit(dvp, cnp, sp); 3034 if (error) 3035 goto bad; 3036 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3037 cnp->cn_td, &np); 3038 np->n_sillyrename = sp; 3039 return (0); 3040 bad: 3041 vrele(sp->s_dvp); 3042 crfree(sp->s_cred); 3043 kfree((caddr_t)sp, M_NFSREQ); 3044 3045 return (error); 3046 } 3047 3048 /* 3049 * Look up a file name and optionally either update the file handle or 3050 * allocate an nfsnode, depending on the value of npp. 3051 * npp == NULL --> just do the lookup 3052 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 3053 * handled too 3054 * *npp != NULL --> update the file handle in the vnode 3055 */ 3056 static int 3057 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 3058 struct thread *td, struct nfsnode **npp) 3059 { 3060 struct vnode *newvp = NULL; 3061 struct nfsnode *np, *dnp = VTONFS(dvp); 3062 int error = 0, fhlen, attrflag; 3063 nfsfh_t *nfhp; 3064 struct nfsm_info info; 3065 3066 info.mrep = NULL; 3067 info.v3 = NFS_ISV3(dvp); 3068 3069 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 3070 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 3071 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 3072 ERROROUT(nfsm_fhtom(&info, dvp)); 3073 ERROROUT(nfsm_strtom(&info, name, len, NFS_MAXNAMLEN)); 3074 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, cred, &error)); 3075 if (npp && !error) { 3076 NEGATIVEOUT(fhlen = nfsm_getfh(&info, &nfhp)); 3077 if (*npp) { 3078 np = *npp; 3079 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 3080 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 3081 np->n_fhp = &np->n_fh; 3082 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 3083 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 3084 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 3085 np->n_fhsize = fhlen; 3086 newvp = NFSTOV(np); 3087 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 3088 vref(dvp); 3089 newvp = dvp; 3090 } else { 3091 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, NULL); 3092 if (error) { 3093 m_freem(info.mrep); 3094 info.mrep = NULL; 3095 return (error); 3096 } 3097 newvp = NFSTOV(np); 3098 } 3099 if (info.v3) { 3100 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 3101 NFS_LATTR_NOSHRINK)); 3102 if (!attrflag && *npp == NULL) { 3103 m_freem(info.mrep); 3104 info.mrep = NULL; 3105 if (newvp == dvp) 3106 vrele(newvp); 3107 else 3108 vput(newvp); 3109 return (ENOENT); 3110 } 3111 } else { 3112 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 3113 } 3114 } 3115 m_freem(info.mrep); 3116 info.mrep = NULL; 3117 nfsmout: 3118 if (npp && *npp == NULL) { 3119 if (error) { 3120 if (newvp) { 3121 if (newvp == dvp) 3122 vrele(newvp); 3123 else 3124 vput(newvp); 3125 } 3126 } else 3127 *npp = np; 3128 } 3129 return (error); 3130 } 3131 3132 /* 3133 * Nfs Version 3 commit rpc 3134 * 3135 * We call it 'uio' to distinguish it from 'bio' but there is no real uio 3136 * involved. 3137 */ 3138 int 3139 nfs_commitrpc_uio(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 3140 { 3141 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3142 int error = 0, wccflag = NFSV3_WCCRATTR; 3143 struct nfsm_info info; 3144 u_int32_t *tl; 3145 3146 info.mrep = NULL; 3147 info.v3 = 1; 3148 3149 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 3150 return (0); 3151 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3152 nfsm_reqhead(&info, vp, NFSPROC_COMMIT, NFSX_FH(1)); 3153 ERROROUT(nfsm_fhtom(&info, vp)); 3154 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 3155 txdr_hyper(offset, tl); 3156 tl += 2; 3157 *tl = txdr_unsigned(cnt); 3158 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_COMMIT, td, 3159 nfs_vpcred(vp, ND_WRITE), &error)); 3160 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 3161 if (!error) { 3162 NULLOUT(tl = nfsm_dissect(&info, NFSX_V3WRITEVERF)); 3163 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 3164 NFSX_V3WRITEVERF)) { 3165 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 3166 NFSX_V3WRITEVERF); 3167 error = NFSERR_STALEWRITEVERF; 3168 } 3169 } 3170 m_freem(info.mrep); 3171 info.mrep = NULL; 3172 nfsmout: 3173 return (error); 3174 } 3175 3176 /* 3177 * Kludge City.. 3178 * - make nfs_bmap() essentially a no-op that does no translation 3179 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3180 * (Maybe I could use the process's page mapping, but I was concerned that 3181 * Kernel Write might not be enabled and also figured copyout() would do 3182 * a lot more work than bcopy() and also it currently happens in the 3183 * context of the swapper process (2). 3184 * 3185 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, 3186 * off_t *a_doffsetp, int *a_runp, int *a_runb) 3187 */ 3188 static int 3189 nfs_bmap(struct vop_bmap_args *ap) 3190 { 3191 /* no token lock required */ 3192 if (ap->a_doffsetp != NULL) 3193 *ap->a_doffsetp = ap->a_loffset; 3194 if (ap->a_runp != NULL) 3195 *ap->a_runp = 0; 3196 if (ap->a_runb != NULL) 3197 *ap->a_runb = 0; 3198 return (0); 3199 } 3200 3201 /* 3202 * Strategy routine. 3203 */ 3204 static int 3205 nfs_strategy(struct vop_strategy_args *ap) 3206 { 3207 struct bio *bio = ap->a_bio; 3208 struct bio *nbio; 3209 struct buf *bp __debugvar = bio->bio_buf; 3210 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3211 struct thread *td; 3212 int error; 3213 3214 KASSERT(bp->b_cmd != BUF_CMD_DONE, 3215 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 3216 KASSERT(BUF_LOCKINUSE(bp), 3217 ("nfs_strategy: buffer %p not locked", bp)); 3218 3219 if (bio->bio_flags & BIO_SYNC) 3220 td = curthread; /* XXX */ 3221 else 3222 td = NULL; 3223 3224 lwkt_gettoken(&nmp->nm_token); 3225 3226 /* 3227 * We probably don't need to push an nbio any more since no 3228 * block conversion is required due to the use of 64 bit byte 3229 * offsets, but do it anyway. 3230 * 3231 * NOTE: When NFS callers itself via this strategy routines and 3232 * sets up a synchronous I/O, it expects the I/O to run 3233 * synchronously (its bio_done routine just assumes it), 3234 * so for now we have to honor the bit. 3235 */ 3236 nbio = push_bio(bio); 3237 nbio->bio_offset = bio->bio_offset; 3238 nbio->bio_flags = bio->bio_flags & BIO_SYNC; 3239 3240 /* 3241 * If the op is asynchronous and an i/o daemon is waiting 3242 * queue the request, wake it up and wait for completion 3243 * otherwise just do it ourselves. 3244 */ 3245 if (bio->bio_flags & BIO_SYNC) { 3246 error = nfs_doio(ap->a_vp, nbio, td); 3247 } else { 3248 nfs_asyncio(ap->a_vp, nbio); 3249 error = 0; 3250 } 3251 lwkt_reltoken(&nmp->nm_token); 3252 3253 return (error); 3254 } 3255 3256 /* 3257 * fsync vnode op. Just call nfs_flush() with commit == 1. 3258 * 3259 * nfs_fsync(struct vnode *a_vp, int a_waitfor) 3260 */ 3261 /* ARGSUSED */ 3262 static int 3263 nfs_fsync(struct vop_fsync_args *ap) 3264 { 3265 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3266 int error; 3267 3268 lwkt_gettoken(&nmp->nm_token); 3269 3270 /* 3271 * NOTE: Because attributes are set synchronously we currently 3272 * do not have to implement vsetisdirty()/vclrisdirty(). 3273 */ 3274 error = nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1); 3275 3276 lwkt_reltoken(&nmp->nm_token); 3277 3278 return error; 3279 } 3280 3281 /* 3282 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 3283 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 3284 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 3285 * set the buffer contains data that has already been written to the server 3286 * and which now needs a commit RPC. 3287 * 3288 * If commit is 0 we only take one pass and only flush buffers containing new 3289 * dirty data. 3290 * 3291 * If commit is 1 we take two passes, issuing a commit RPC in the second 3292 * pass. 3293 * 3294 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 3295 * to completely flush all pending data. 3296 * 3297 * Note that the RB_SCAN code properly handles the case where the 3298 * callback might block and directly or indirectly (another thread) cause 3299 * the RB tree to change. 3300 */ 3301 3302 #ifndef NFS_COMMITBVECSIZ 3303 #define NFS_COMMITBVECSIZ 16 3304 #endif 3305 3306 struct nfs_flush_info { 3307 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 3308 struct thread *td; 3309 struct vnode *vp; 3310 int waitfor; 3311 int slpflag; 3312 int slptimeo; 3313 int loops; 3314 struct buf *bvary[NFS_COMMITBVECSIZ]; 3315 int bvsize; 3316 off_t beg_off; 3317 off_t end_off; 3318 }; 3319 3320 static int nfs_flush_bp(struct buf *bp, void *data); 3321 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 3322 3323 int 3324 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 3325 { 3326 struct nfsnode *np = VTONFS(vp); 3327 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3328 struct nfs_flush_info info; 3329 int error; 3330 3331 bzero(&info, sizeof(info)); 3332 info.td = td; 3333 info.vp = vp; 3334 info.waitfor = waitfor; 3335 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 3336 info.loops = 0; 3337 lwkt_gettoken(&vp->v_token); 3338 3339 do { 3340 /* 3341 * Flush mode 3342 */ 3343 info.mode = NFI_FLUSHNEW; 3344 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3345 nfs_flush_bp, &info); 3346 3347 /* 3348 * Take a second pass if committing and no error occured. 3349 * Clean up any left over collection (whether an error 3350 * occurs or not). 3351 */ 3352 if (commit && error == 0) { 3353 info.mode = NFI_COMMIT; 3354 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3355 nfs_flush_bp, &info); 3356 if (info.bvsize) 3357 error = nfs_flush_docommit(&info, error); 3358 } 3359 3360 /* 3361 * Wait for pending I/O to complete before checking whether 3362 * any further dirty buffers exist. 3363 */ 3364 while (waitfor == MNT_WAIT && 3365 bio_track_active(&vp->v_track_write)) { 3366 error = bio_track_wait(&vp->v_track_write, 3367 info.slpflag, info.slptimeo); 3368 if (error) { 3369 /* 3370 * We have to be able to break out if this 3371 * is an 'intr' mount. 3372 */ 3373 if (nfs_sigintr(nmp, NULL, td)) { 3374 error = -EINTR; 3375 break; 3376 } 3377 3378 /* 3379 * Since we do not process pending signals, 3380 * once we get a PCATCH our tsleep() will no 3381 * longer sleep, switch to a fixed timeout 3382 * instead. 3383 */ 3384 if (info.slpflag == PCATCH) { 3385 info.slpflag = 0; 3386 info.slptimeo = 2 * hz; 3387 } 3388 error = 0; 3389 } 3390 } 3391 ++info.loops; 3392 /* 3393 * Loop if we are flushing synchronous as well as committing, 3394 * and dirty buffers are still present. Otherwise we might livelock. 3395 */ 3396 } while (waitfor == MNT_WAIT && commit && 3397 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 3398 3399 /* 3400 * The callbacks have to return a negative error to terminate the 3401 * RB scan. 3402 */ 3403 if (error < 0) 3404 error = -error; 3405 3406 /* 3407 * Deal with any error collection 3408 */ 3409 if (np->n_flag & NWRITEERR) { 3410 error = np->n_error; 3411 np->n_flag &= ~NWRITEERR; 3412 } 3413 lwkt_reltoken(&vp->v_token); 3414 return (error); 3415 } 3416 3417 static 3418 int 3419 nfs_flush_bp(struct buf *bp, void *data) 3420 { 3421 struct nfs_flush_info *info = data; 3422 int lkflags; 3423 int error; 3424 off_t toff; 3425 3426 error = 0; 3427 switch(info->mode) { 3428 case NFI_FLUSHNEW: 3429 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3430 if (error && info->loops && info->waitfor == MNT_WAIT) { 3431 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3432 if (error) { 3433 lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3434 if (info->slpflag & PCATCH) 3435 lkflags |= LK_PCATCH; 3436 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3437 info->slptimeo); 3438 } 3439 } 3440 3441 /* 3442 * Ignore locking errors 3443 */ 3444 if (error) { 3445 error = 0; 3446 break; 3447 } 3448 3449 /* 3450 * The buffer may have changed out from under us, even if 3451 * we did not block (MPSAFE). Check again now that it is 3452 * locked. 3453 */ 3454 if (bp->b_vp == info->vp && 3455 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) == B_DELWRI) { 3456 bremfree(bp); 3457 bawrite(bp); 3458 } else { 3459 BUF_UNLOCK(bp); 3460 } 3461 break; 3462 case NFI_COMMIT: 3463 /* 3464 * Only process buffers in need of a commit which we can 3465 * immediately lock. This may prevent a buffer from being 3466 * committed, but the normal flush loop will block on the 3467 * same buffer so we shouldn't get into an endless loop. 3468 */ 3469 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3470 (B_DELWRI | B_NEEDCOMMIT)) { 3471 break; 3472 } 3473 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 3474 break; 3475 3476 /* 3477 * We must recheck after successfully locking the buffer. 3478 */ 3479 if (bp->b_vp != info->vp || 3480 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3481 (B_DELWRI | B_NEEDCOMMIT)) { 3482 BUF_UNLOCK(bp); 3483 break; 3484 } 3485 3486 /* 3487 * NOTE: storing the bp in the bvary[] basically sets 3488 * it up for a commit operation. 3489 * 3490 * We must call vfs_busy_pages() now so the commit operation 3491 * is interlocked with user modifications to memory mapped 3492 * pages. The b_dirtyoff/b_dirtyend range is not correct 3493 * until after the pages have been busied. 3494 * 3495 * Note: to avoid loopback deadlocks, we do not 3496 * assign b_runningbufspace. 3497 */ 3498 bremfree(bp); 3499 bp->b_cmd = BUF_CMD_WRITE; 3500 vfs_busy_pages(bp->b_vp, bp); 3501 info->bvary[info->bvsize] = bp; 3502 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3503 if (info->bvsize == 0 || toff < info->beg_off) 3504 info->beg_off = toff; 3505 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3506 if (info->bvsize == 0 || toff > info->end_off) 3507 info->end_off = toff; 3508 ++info->bvsize; 3509 if (info->bvsize == NFS_COMMITBVECSIZ) { 3510 error = nfs_flush_docommit(info, 0); 3511 KKASSERT(info->bvsize == 0); 3512 } 3513 } 3514 return (error); 3515 } 3516 3517 static 3518 int 3519 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3520 { 3521 struct vnode *vp; 3522 struct buf *bp; 3523 off_t bytes; 3524 int retv; 3525 int i; 3526 3527 vp = info->vp; 3528 3529 if (info->bvsize > 0) { 3530 /* 3531 * Commit data on the server, as required. Note that 3532 * nfs_commit will use the vnode's cred for the commit. 3533 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3534 */ 3535 bytes = info->end_off - info->beg_off; 3536 if (bytes > 0x40000000) 3537 bytes = 0x40000000; 3538 if (error) { 3539 retv = -error; 3540 } else { 3541 retv = nfs_commitrpc_uio(vp, info->beg_off, 3542 (int)bytes, info->td); 3543 if (retv == NFSERR_STALEWRITEVERF) 3544 nfs_clearcommit(vp->v_mount); 3545 } 3546 3547 /* 3548 * Now, either mark the blocks I/O done or mark the 3549 * blocks dirty, depending on whether the commit 3550 * succeeded. 3551 */ 3552 for (i = 0; i < info->bvsize; ++i) { 3553 bp = info->bvary[i]; 3554 if (retv || (bp->b_flags & B_NEEDCOMMIT) == 0) { 3555 /* 3556 * Either an error or the original 3557 * vfs_busy_pages() cleared B_NEEDCOMMIT 3558 * due to finding new dirty VM pages in 3559 * the buffer. 3560 * 3561 * Leave B_DELWRI intact. 3562 */ 3563 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3564 vfs_unbusy_pages(bp); 3565 bp->b_cmd = BUF_CMD_DONE; 3566 bqrelse(bp); 3567 } else { 3568 /* 3569 * Success, remove B_DELWRI ( bundirty() ). 3570 * 3571 * b_dirtyoff/b_dirtyend seem to be NFS 3572 * specific. We should probably move that 3573 * into bundirty(). XXX 3574 * 3575 * We are faking an I/O write, we have to 3576 * start the transaction in order to 3577 * immediately biodone() it. 3578 */ 3579 bundirty(bp); 3580 bp->b_flags &= ~B_ERROR; 3581 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3582 bp->b_dirtyoff = bp->b_dirtyend = 0; 3583 biodone(&bp->b_bio1); 3584 } 3585 } 3586 info->bvsize = 0; 3587 } 3588 return (error); 3589 } 3590 3591 /* 3592 * NFS advisory byte-level locks. 3593 * Currently unsupported. 3594 * 3595 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3596 * int a_flags) 3597 */ 3598 static int 3599 nfs_advlock(struct vop_advlock_args *ap) 3600 { 3601 struct nfsnode *np = VTONFS(ap->a_vp); 3602 3603 /* no token lock currently required */ 3604 /* 3605 * The following kludge is to allow diskless support to work 3606 * until a real NFS lockd is implemented. Basically, just pretend 3607 * that this is a local lock. 3608 */ 3609 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3610 } 3611 3612 /* 3613 * Print out the contents of an nfsnode. 3614 * 3615 * nfs_print(struct vnode *a_vp) 3616 */ 3617 static int 3618 nfs_print(struct vop_print_args *ap) 3619 { 3620 struct vnode *vp = ap->a_vp; 3621 struct nfsnode *np = VTONFS(vp); 3622 3623 kprintf("tag VT_NFS, fileid %lld fsid 0x%x", 3624 (long long)np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3625 if (vp->v_type == VFIFO) 3626 fifo_printinfo(vp); 3627 kprintf("\n"); 3628 return (0); 3629 } 3630 3631 /* 3632 * nfs special file access vnode op. 3633 * 3634 * nfs_laccess(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 3635 */ 3636 static int 3637 nfs_laccess(struct vop_access_args *ap) 3638 { 3639 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3640 struct vattr vattr; 3641 int error; 3642 3643 lwkt_gettoken(&nmp->nm_token); 3644 error = VOP_GETATTR(ap->a_vp, &vattr); 3645 if (error == 0) { 3646 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid, 3647 vattr.va_mode, 0); 3648 } 3649 lwkt_reltoken(&nmp->nm_token); 3650 3651 return (error); 3652 } 3653 3654 /* 3655 * Read wrapper for fifos. 3656 * 3657 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3658 * struct ucred *a_cred) 3659 */ 3660 static int 3661 nfsfifo_read(struct vop_read_args *ap) 3662 { 3663 struct nfsnode *np = VTONFS(ap->a_vp); 3664 3665 /* no token access required */ 3666 /* 3667 * Set access flag. 3668 */ 3669 np->n_flag |= NACC; 3670 getnanotime(&np->n_atim); 3671 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3672 } 3673 3674 /* 3675 * Write wrapper for fifos. 3676 * 3677 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3678 * struct ucred *a_cred) 3679 */ 3680 static int 3681 nfsfifo_write(struct vop_write_args *ap) 3682 { 3683 struct nfsnode *np = VTONFS(ap->a_vp); 3684 3685 /* no token access required */ 3686 /* 3687 * Set update flag. 3688 */ 3689 np->n_flag |= NUPD; 3690 getnanotime(&np->n_mtim); 3691 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3692 } 3693 3694 /* 3695 * Close wrapper for fifos. 3696 * 3697 * Update the times on the nfsnode then do fifo close. 3698 * 3699 * nfsfifo_close(struct vnode *a_vp, int a_fflag) 3700 */ 3701 static int 3702 nfsfifo_close(struct vop_close_args *ap) 3703 { 3704 struct vnode *vp = ap->a_vp; 3705 struct nfsnode *np = VTONFS(vp); 3706 struct vattr vattr; 3707 struct timespec ts; 3708 3709 /* no token access required */ 3710 3711 vn_lock(vp, LK_UPGRADE | LK_RETRY); /* XXX */ 3712 if (np->n_flag & (NACC | NUPD)) { 3713 getnanotime(&ts); 3714 if (np->n_flag & NACC) 3715 np->n_atim = ts; 3716 if (np->n_flag & NUPD) 3717 np->n_mtim = ts; 3718 np->n_flag |= NCHG; 3719 if (VREFCNT(vp) == 1 && 3720 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3721 VATTR_NULL(&vattr); 3722 if (np->n_flag & NACC) 3723 vattr.va_atime = np->n_atim; 3724 if (np->n_flag & NUPD) 3725 vattr.va_mtime = np->n_mtim; 3726 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3727 } 3728 } 3729 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3730 } 3731 3732 /************************************************************************ 3733 * KQFILTER OPS * 3734 ************************************************************************/ 3735 3736 static void filt_nfsdetach(struct knote *kn); 3737 static int filt_nfsread(struct knote *kn, long hint); 3738 static int filt_nfswrite(struct knote *kn, long hint); 3739 static int filt_nfsvnode(struct knote *kn, long hint); 3740 3741 static struct filterops nfsread_filtops = 3742 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3743 NULL, filt_nfsdetach, filt_nfsread }; 3744 static struct filterops nfswrite_filtops = 3745 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3746 NULL, filt_nfsdetach, filt_nfswrite }; 3747 static struct filterops nfsvnode_filtops = 3748 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3749 NULL, filt_nfsdetach, filt_nfsvnode }; 3750 3751 static int 3752 nfs_kqfilter (struct vop_kqfilter_args *ap) 3753 { 3754 struct vnode *vp = ap->a_vp; 3755 struct knote *kn = ap->a_kn; 3756 3757 switch (kn->kn_filter) { 3758 case EVFILT_READ: 3759 kn->kn_fop = &nfsread_filtops; 3760 break; 3761 case EVFILT_WRITE: 3762 kn->kn_fop = &nfswrite_filtops; 3763 break; 3764 case EVFILT_VNODE: 3765 kn->kn_fop = &nfsvnode_filtops; 3766 break; 3767 default: 3768 return (EOPNOTSUPP); 3769 } 3770 3771 kn->kn_hook = (caddr_t)vp; 3772 3773 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3774 3775 return(0); 3776 } 3777 3778 static void 3779 filt_nfsdetach(struct knote *kn) 3780 { 3781 struct vnode *vp = (void *)kn->kn_hook; 3782 3783 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3784 } 3785 3786 static int 3787 filt_nfsread(struct knote *kn, long hint) 3788 { 3789 struct vnode *vp = (void *)kn->kn_hook; 3790 struct nfsnode *node = VTONFS(vp); 3791 off_t off; 3792 3793 if (hint == NOTE_REVOKE) { 3794 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3795 return(1); 3796 } 3797 3798 /* 3799 * Interlock against MP races when performing this function. XXX 3800 */ 3801 /* TMPFS_NODE_LOCK_SH(node); */ 3802 off = node->n_size - kn->kn_fp->f_offset; 3803 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3804 if (kn->kn_sfflags & NOTE_OLDAPI) { 3805 /* TMPFS_NODE_UNLOCK(node); */ 3806 return(1); 3807 } 3808 if (kn->kn_data == 0) { 3809 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3810 } 3811 /* TMPFS_NODE_UNLOCK(node); */ 3812 return (kn->kn_data != 0); 3813 } 3814 3815 static int 3816 filt_nfswrite(struct knote *kn, long hint) 3817 { 3818 if (hint == NOTE_REVOKE) 3819 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3820 kn->kn_data = 0; 3821 return (1); 3822 } 3823 3824 static int 3825 filt_nfsvnode(struct knote *kn, long hint) 3826 { 3827 if (kn->kn_sfflags & hint) 3828 kn->kn_fflags |= hint; 3829 if (hint == NOTE_REVOKE) { 3830 kn->kn_flags |= (EV_EOF | EV_NODATA); 3831 return (1); 3832 } 3833 return (kn->kn_fflags != 0); 3834 } 3835