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