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 /* 767 * Handle size changes 768 */ 769 if (vap->va_size != VNOVAL) { 770 /* 771 * truncation requested 772 */ 773 switch (vp->v_type) { 774 case VDIR: 775 lwkt_reltoken(&nmp->nm_token); 776 return (EISDIR); 777 case VCHR: 778 case VBLK: 779 case VSOCK: 780 case VFIFO: 781 if (vap->va_mtime.tv_sec == VNOVAL && 782 vap->va_atime.tv_sec == VNOVAL && 783 vap->va_mode == (mode_t)VNOVAL && 784 vap->va_uid == (uid_t)VNOVAL && 785 vap->va_gid == (gid_t)VNOVAL) { 786 lwkt_reltoken(&nmp->nm_token); 787 return (0); 788 } 789 vap->va_size = VNOVAL; 790 break; 791 default: 792 /* 793 * Disallow write attempts if the filesystem is 794 * mounted read-only. 795 */ 796 if (vp->v_mount->mnt_flag & MNT_RDONLY) { 797 lwkt_reltoken(&nmp->nm_token); 798 return (EROFS); 799 } 800 801 tsize = np->n_size; 802 again: 803 error = nfs_meta_setsize(vp, td, vap->va_size, 0); 804 805 #if 0 806 if (np->n_flag & NLMODIFIED) { 807 if (vap->va_size == 0) 808 error = nfs_vinvalbuf(vp, 0, 1); 809 else 810 error = nfs_vinvalbuf(vp, V_SAVE, 1); 811 } 812 #endif 813 /* 814 * note: this loop case almost always happens at 815 * least once per truncation. 816 */ 817 if (error == 0 && np->n_size != vap->va_size) 818 goto again; 819 np->n_vattr.va_size = vap->va_size; 820 kflags |= NOTE_WRITE; 821 if (tsize < vap->va_size) 822 kflags |= NOTE_EXTEND; 823 break; 824 } 825 } 826 827 /* 828 * If setting the mtime or if server/other-client modifications have 829 * been detected, we must fully flush any pending writes. 830 * 831 * This will slow down cp/cpdup/rdist/rsync and other operations which 832 * might call [l]utimes() to set the mtime after writing to a file, 833 * but honestly there is no way to properly defer the write flush 834 * and still get reasonably accurate/dependable synchronization of 835 * [l]utimes(). 836 */ 837 if ((np->n_flag & NLMODIFIED) && vp->v_type == VREG) { 838 if ((np->n_flag & NRMODIFIED) || 839 (vap->va_mtime.tv_sec != VNOVAL)) { 840 error = nfs_vinvalbuf(vp, V_SAVE, 1); 841 if (error == EINTR) { 842 lwkt_reltoken(&nmp->nm_token); 843 return (error); 844 } 845 } 846 } 847 848 /* 849 * Get the blasted mtime to report properly. 850 */ 851 if (vap->va_mtime.tv_sec != VNOVAL) { 852 np->n_mtime = vap->va_mtime.tv_sec; 853 np->n_flag &= ~NUPD; 854 np->n_vattr.va_mtime = vap->va_mtime; 855 } 856 857 /* 858 * Issue the setattr rpc, adjust our mtime and make sure NUPD 859 * has been cleared so it does not get overridden. 860 */ 861 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 862 if (error == 0) 863 kflags |= NOTE_EXTEND; 864 865 /* 866 * Sanity check if a truncation was issued. This should only occur 867 * if multiple processes are racing on the same file. 868 */ 869 if (error == 0 && vap->va_size != VNOVAL && 870 np->n_size != vap->va_size) { 871 kprintf("NFS ftruncate: server disagrees on the file size: " 872 "%jd/%jd/%jd\n", 873 (intmax_t)tsize, 874 (intmax_t)vap->va_size, 875 (intmax_t)np->n_size); 876 goto again; 877 } 878 if (error && vap->va_size != VNOVAL) { 879 np->n_size = np->n_vattr.va_size = tsize; 880 nfs_meta_setsize(vp, td, np->n_size, 0); 881 } 882 lwkt_reltoken(&nmp->nm_token); 883 nfs_knote(vp, kflags); 884 885 return (error); 886 } 887 888 /* 889 * Do an nfs setattr rpc. 890 */ 891 static int 892 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 893 struct ucred *cred, struct thread *td) 894 { 895 struct nfsv2_sattr *sp; 896 struct nfsnode *np = VTONFS(vp); 897 u_int32_t *tl; 898 int error = 0, wccflag = NFSV3_WCCRATTR; 899 struct nfsm_info info; 900 901 info.mrep = NULL; 902 info.v3 = NFS_ISV3(vp); 903 904 nfsstats.rpccnt[NFSPROC_SETATTR]++; 905 nfsm_reqhead(&info, vp, NFSPROC_SETATTR, 906 NFSX_FH(info.v3) + NFSX_SATTR(info.v3)); 907 ERROROUT(nfsm_fhtom(&info, vp)); 908 if (info.v3) { 909 nfsm_v3attrbuild(&info, vap, TRUE); 910 tl = nfsm_build(&info, NFSX_UNSIGNED); 911 *tl = nfs_false; 912 } else { 913 sp = nfsm_build(&info, NFSX_V2SATTR); 914 if (vap->va_mode == (mode_t)VNOVAL) 915 sp->sa_mode = nfs_xdrneg1; 916 else 917 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 918 if (vap->va_uid == (uid_t)VNOVAL) 919 sp->sa_uid = nfs_xdrneg1; 920 else 921 sp->sa_uid = txdr_unsigned(vap->va_uid); 922 if (vap->va_gid == (gid_t)VNOVAL) 923 sp->sa_gid = nfs_xdrneg1; 924 else 925 sp->sa_gid = txdr_unsigned(vap->va_gid); 926 sp->sa_size = txdr_unsigned(vap->va_size); 927 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 928 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 929 } 930 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_SETATTR, td, cred, &error)); 931 if (info.v3) { 932 np->n_modestamp = 0; 933 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 934 } else { 935 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 936 } 937 m_freem(info.mrep); 938 info.mrep = NULL; 939 nfsmout: 940 return (error); 941 } 942 943 static 944 void 945 nfs_cache_setvp(struct nchandle *nch, struct vnode *vp, int nctimeout) 946 { 947 if (nctimeout == 0) 948 nctimeout = 1; 949 else 950 nctimeout *= hz; 951 cache_setvp(nch, vp); 952 cache_settimeout(nch, nctimeout); 953 } 954 955 /* 956 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 957 * nfs_lookup() until all remaining new api calls are implemented. 958 * 959 * Resolve a namecache entry. This function is passed a locked ncp and 960 * must call nfs_cache_setvp() on it as appropriate to resolve the entry. 961 */ 962 static int 963 nfs_nresolve(struct vop_nresolve_args *ap) 964 { 965 struct thread *td = curthread; 966 struct namecache *ncp; 967 struct nfsmount *nmp; 968 struct nfsnode *np; 969 struct vnode *dvp; 970 struct vnode *nvp; 971 nfsfh_t *fhp; 972 int attrflag; 973 int fhsize; 974 int error; 975 int tmp_error; 976 int len; 977 struct nfsm_info info; 978 979 dvp = ap->a_dvp; 980 nmp = VFSTONFS(dvp->v_mount); 981 982 lwkt_gettoken(&nmp->nm_token); 983 984 if ((error = vget(dvp, LK_SHARED)) != 0) { 985 lwkt_reltoken(&nmp->nm_token); 986 return (error); 987 } 988 989 info.mrep = NULL; 990 info.v3 = NFS_ISV3(dvp); 991 992 nvp = NULL; 993 nfsstats.lookupcache_misses++; 994 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 995 ncp = ap->a_nch->ncp; 996 len = ncp->nc_nlen; 997 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 998 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 999 ERROROUT(nfsm_fhtom(&info, dvp)); 1000 ERROROUT(nfsm_strtom(&info, ncp->nc_name, len, NFS_MAXNAMLEN)); 1001 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, 1002 ap->a_cred, &error)); 1003 if (error) { 1004 /* 1005 * Cache negatve lookups to reduce NFS traffic, but use 1006 * a fast timeout. Otherwise use a timeout of 1 tick. 1007 * XXX we should add a namecache flag for no-caching 1008 * to uncache the negative hit as soon as possible, but 1009 * we cannot simply destroy the entry because it is used 1010 * as a placeholder by the caller. 1011 * 1012 * The refactored nfs code will overwrite a non-zero error 1013 * with 0 when we use ERROROUT(), so don't here. 1014 */ 1015 if (error == ENOENT) 1016 nfs_cache_setvp(ap->a_nch, NULL, nfsneg_cache_timeout); 1017 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 1018 NFS_LATTR_NOSHRINK); 1019 if (tmp_error) { 1020 error = tmp_error; 1021 goto nfsmout; 1022 } 1023 m_freem(info.mrep); 1024 info.mrep = NULL; 1025 goto nfsmout; 1026 } 1027 1028 /* 1029 * Success, get the file handle, do various checks, and load 1030 * post-operation data from the reply packet. Theoretically 1031 * we should never be looking up "." so, theoretically, we 1032 * should never get the same file handle as our directory. But 1033 * we check anyway. XXX 1034 * 1035 * Note that no timeout is set for the positive cache hit. We 1036 * assume, theoretically, that ESTALE returns will be dealt with 1037 * properly to handle NFS races and in anycase we cannot depend 1038 * on a timeout to deal with NFS open/create/excl issues so instead 1039 * of a bad hack here the rest of the NFS client code needs to do 1040 * the right thing. 1041 */ 1042 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 1043 1044 np = VTONFS(dvp); 1045 if (NFS_CMPFH(np, fhp, fhsize)) { 1046 vref(dvp); 1047 nvp = dvp; 1048 } else { 1049 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, NULL); 1050 if (error) { 1051 m_freem(info.mrep); 1052 info.mrep = NULL; 1053 vput(dvp); 1054 lwkt_reltoken(&nmp->nm_token); 1055 return (error); 1056 } 1057 nvp = NFSTOV(np); 1058 } 1059 if (info.v3) { 1060 ERROROUT(nfsm_postop_attr(&info, nvp, &attrflag, 1061 NFS_LATTR_NOSHRINK)); 1062 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1063 NFS_LATTR_NOSHRINK)); 1064 } else { 1065 ERROROUT(nfsm_loadattr(&info, nvp, NULL)); 1066 } 1067 nfs_cache_setvp(ap->a_nch, nvp, nfspos_cache_timeout); 1068 m_freem(info.mrep); 1069 info.mrep = NULL; 1070 nfsmout: 1071 lwkt_reltoken(&nmp->nm_token); 1072 vput(dvp); 1073 if (nvp) { 1074 if (nvp == dvp) 1075 vrele(nvp); 1076 else 1077 vput(nvp); 1078 } 1079 return (error); 1080 } 1081 1082 /* 1083 * 'cached' nfs directory lookup 1084 * 1085 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 1086 * 1087 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 1088 * struct componentname *a_cnp) 1089 */ 1090 static int 1091 nfs_lookup(struct vop_old_lookup_args *ap) 1092 { 1093 struct componentname *cnp = ap->a_cnp; 1094 struct vnode *dvp = ap->a_dvp; 1095 struct vnode **vpp = ap->a_vpp; 1096 int flags = cnp->cn_flags; 1097 struct vnode *newvp; 1098 struct vnode *notvp; 1099 struct nfsmount *nmp; 1100 long len; 1101 nfsfh_t *fhp; 1102 struct nfsnode *np; 1103 int lockparent, wantparent, attrflag, fhsize; 1104 int error; 1105 int tmp_error; 1106 struct nfsm_info info; 1107 1108 info.mrep = NULL; 1109 info.v3 = NFS_ISV3(dvp); 1110 error = 0; 1111 1112 notvp = (cnp->cn_flags & CNP_NOTVP) ? cnp->cn_notvp : NULL; 1113 1114 /* 1115 * Read-only mount check and directory check. 1116 */ 1117 *vpp = NULLVP; 1118 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 1119 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 1120 return (EROFS); 1121 1122 if (dvp->v_type != VDIR) 1123 return (ENOTDIR); 1124 1125 /* 1126 * Look it up in the cache. Note that ENOENT is only returned if we 1127 * previously entered a negative hit (see later on). The additional 1128 * nfsneg_cache_timeout check causes previously cached results to 1129 * be instantly ignored if the negative caching is turned off. 1130 */ 1131 lockparent = flags & CNP_LOCKPARENT; 1132 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 1133 nmp = VFSTONFS(dvp->v_mount); 1134 np = VTONFS(dvp); 1135 1136 lwkt_gettoken(&nmp->nm_token); 1137 1138 /* 1139 * Go to the wire. 1140 */ 1141 error = 0; 1142 newvp = NULLVP; 1143 nfsstats.lookupcache_misses++; 1144 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1145 len = cnp->cn_namelen; 1146 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 1147 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1148 ERROROUT(nfsm_fhtom(&info, dvp)); 1149 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 1150 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, cnp->cn_td, 1151 cnp->cn_cred, &error)); 1152 if (error) { 1153 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 1154 NFS_LATTR_NOSHRINK); 1155 if (tmp_error) { 1156 error = tmp_error; 1157 goto nfsmout; 1158 } 1159 1160 m_freem(info.mrep); 1161 info.mrep = NULL; 1162 goto nfsmout; 1163 } 1164 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 1165 1166 /* 1167 * Handle RENAME case... 1168 */ 1169 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1170 if (NFS_CMPFH(np, fhp, fhsize)) { 1171 m_freem(info.mrep); 1172 info.mrep = NULL; 1173 lwkt_reltoken(&nmp->nm_token); 1174 return (EISDIR); 1175 } 1176 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1177 if (error) { 1178 m_freem(info.mrep); 1179 info.mrep = NULL; 1180 lwkt_reltoken(&nmp->nm_token); 1181 return (error); 1182 } 1183 newvp = NFSTOV(np); 1184 if (info.v3) { 1185 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1186 NFS_LATTR_NOSHRINK)); 1187 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1188 NFS_LATTR_NOSHRINK)); 1189 } else { 1190 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1191 } 1192 *vpp = newvp; 1193 m_freem(info.mrep); 1194 info.mrep = NULL; 1195 if (!lockparent) { 1196 vn_unlock(dvp); 1197 cnp->cn_flags |= CNP_PDIRUNLOCK; 1198 } 1199 lwkt_reltoken(&nmp->nm_token); 1200 return (0); 1201 } 1202 1203 if (flags & CNP_ISDOTDOT) { 1204 vn_unlock(dvp); 1205 cnp->cn_flags |= CNP_PDIRUNLOCK; 1206 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1207 if (error) { 1208 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1209 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1210 lwkt_reltoken(&nmp->nm_token); 1211 return (error); /* NOTE: return error from nget */ 1212 } 1213 newvp = NFSTOV(np); 1214 if (lockparent) { 1215 error = vn_lock(dvp, LK_EXCLUSIVE | LK_FAILRECLAIM); 1216 if (error) { 1217 vput(newvp); 1218 lwkt_reltoken(&nmp->nm_token); 1219 return (error); 1220 } 1221 cnp->cn_flags |= CNP_PDIRUNLOCK; 1222 } 1223 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1224 vref(dvp); 1225 newvp = dvp; 1226 } else { 1227 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np, notvp); 1228 if (error) { 1229 m_freem(info.mrep); 1230 info.mrep = NULL; 1231 lwkt_reltoken(&nmp->nm_token); 1232 return (error); 1233 } 1234 if (!lockparent) { 1235 vn_unlock(dvp); 1236 cnp->cn_flags |= CNP_PDIRUNLOCK; 1237 } 1238 newvp = NFSTOV(np); 1239 } 1240 if (info.v3) { 1241 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1242 NFS_LATTR_NOSHRINK)); 1243 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1244 NFS_LATTR_NOSHRINK)); 1245 } else { 1246 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1247 } 1248 #if 0 1249 /* XXX MOVE TO nfs_nremove() */ 1250 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1251 cnp->cn_nameiop != NAMEI_DELETE) { 1252 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1253 } 1254 #endif 1255 *vpp = newvp; 1256 m_freem(info.mrep); 1257 info.mrep = NULL; 1258 nfsmout: 1259 if (error) { 1260 if (newvp != NULLVP) { 1261 vrele(newvp); 1262 *vpp = NULLVP; 1263 } 1264 if ((cnp->cn_nameiop == NAMEI_CREATE || 1265 cnp->cn_nameiop == NAMEI_RENAME) && 1266 error == ENOENT) { 1267 if (!lockparent) { 1268 vn_unlock(dvp); 1269 cnp->cn_flags |= CNP_PDIRUNLOCK; 1270 } 1271 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1272 error = EROFS; 1273 else 1274 error = EJUSTRETURN; 1275 } 1276 } 1277 lwkt_reltoken(&nmp->nm_token); 1278 return (error); 1279 } 1280 1281 /* 1282 * nfs read call. 1283 * Just call nfs_bioread() to do the work. 1284 * 1285 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1286 * struct ucred *a_cred) 1287 */ 1288 static int 1289 nfs_read(struct vop_read_args *ap) 1290 { 1291 struct vnode *vp = ap->a_vp; 1292 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1293 int error; 1294 1295 lwkt_gettoken(&nmp->nm_token); 1296 error = nfs_bioread(vp, ap->a_uio, ap->a_ioflag); 1297 lwkt_reltoken(&nmp->nm_token); 1298 1299 return error; 1300 } 1301 1302 /* 1303 * nfs readlink call 1304 * 1305 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1306 */ 1307 static int 1308 nfs_readlink(struct vop_readlink_args *ap) 1309 { 1310 struct vnode *vp = ap->a_vp; 1311 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1312 int error; 1313 1314 if (vp->v_type != VLNK) 1315 return (EINVAL); 1316 1317 lwkt_gettoken(&nmp->nm_token); 1318 error = nfs_bioread(vp, ap->a_uio, 0); 1319 lwkt_reltoken(&nmp->nm_token); 1320 1321 return error; 1322 } 1323 1324 /* 1325 * Do a readlink rpc. 1326 * Called by nfs_doio() from below the buffer cache. 1327 */ 1328 int 1329 nfs_readlinkrpc_uio(struct vnode *vp, struct uio *uiop) 1330 { 1331 int error = 0, len, attrflag; 1332 struct nfsm_info info; 1333 1334 info.mrep = NULL; 1335 info.v3 = NFS_ISV3(vp); 1336 1337 nfsstats.rpccnt[NFSPROC_READLINK]++; 1338 nfsm_reqhead(&info, vp, NFSPROC_READLINK, NFSX_FH(info.v3)); 1339 ERROROUT(nfsm_fhtom(&info, vp)); 1340 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READLINK, uiop->uio_td, 1341 nfs_vpcred(vp, ND_CHECK), &error)); 1342 if (info.v3) { 1343 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1344 NFS_LATTR_NOSHRINK)); 1345 } 1346 if (!error) { 1347 NEGATIVEOUT(len = nfsm_strsiz(&info, NFS_MAXPATHLEN)); 1348 if (len == NFS_MAXPATHLEN) { 1349 struct nfsnode *np = VTONFS(vp); 1350 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1351 len = np->n_size; 1352 } 1353 ERROROUT(nfsm_mtouio(&info, uiop, len)); 1354 } 1355 m_freem(info.mrep); 1356 info.mrep = NULL; 1357 nfsmout: 1358 return (error); 1359 } 1360 1361 /* 1362 * nfs synchronous read rpc using UIO 1363 */ 1364 int 1365 nfs_readrpc_uio(struct vnode *vp, struct uio *uiop) 1366 { 1367 u_int32_t *tl; 1368 struct nfsmount *nmp; 1369 int error = 0, len, retlen, tsiz, eof, attrflag; 1370 struct nfsm_info info; 1371 off_t tmp_off; 1372 1373 info.mrep = NULL; 1374 info.v3 = NFS_ISV3(vp); 1375 1376 #ifndef nolint 1377 eof = 0; 1378 #endif 1379 nmp = VFSTONFS(vp->v_mount); 1380 1381 tsiz = uiop->uio_resid; 1382 tmp_off = uiop->uio_offset + tsiz; 1383 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uiop->uio_offset) 1384 return (EFBIG); 1385 tmp_off = uiop->uio_offset; 1386 while (tsiz > 0) { 1387 nfsstats.rpccnt[NFSPROC_READ]++; 1388 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1389 nfsm_reqhead(&info, vp, NFSPROC_READ, 1390 NFSX_FH(info.v3) + NFSX_UNSIGNED * 3); 1391 ERROROUT(nfsm_fhtom(&info, vp)); 1392 tl = nfsm_build(&info, NFSX_UNSIGNED * 3); 1393 if (info.v3) { 1394 txdr_hyper(uiop->uio_offset, tl); 1395 *(tl + 2) = txdr_unsigned(len); 1396 } else { 1397 *tl++ = txdr_unsigned(uiop->uio_offset); 1398 *tl++ = txdr_unsigned(len); 1399 *tl = 0; 1400 } 1401 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READ, uiop->uio_td, 1402 nfs_vpcred(vp, ND_READ), &error)); 1403 if (info.v3) { 1404 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1405 NFS_LATTR_NOSHRINK)); 1406 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 1407 eof = fxdr_unsigned(int, *(tl + 1)); 1408 } else { 1409 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1410 } 1411 NEGATIVEOUT(retlen = nfsm_strsiz(&info, len)); 1412 ERROROUT(nfsm_mtouio(&info, uiop, retlen)); 1413 m_freem(info.mrep); 1414 info.mrep = NULL; 1415 1416 /* 1417 * Handle short-read from server (NFSv3). If EOF is not 1418 * flagged (and no error occurred), but retlen is less 1419 * then the request size, we must zero-fill the remainder. 1420 */ 1421 if (retlen < len && info.v3 && eof == 0) { 1422 ERROROUT(uiomovez(len - retlen, uiop)); 1423 retlen = len; 1424 } 1425 tsiz -= retlen; 1426 1427 /* 1428 * Terminate loop on EOF or zero-length read. 1429 * 1430 * For NFSv2 a short-read indicates EOF, not zero-fill, 1431 * and also terminates the loop. 1432 */ 1433 if (info.v3) { 1434 if (eof || retlen == 0) 1435 tsiz = 0; 1436 } else if (retlen < len) { 1437 tsiz = 0; 1438 } 1439 } 1440 nfsmout: 1441 return (error); 1442 } 1443 1444 /* 1445 * nfs write call 1446 */ 1447 int 1448 nfs_writerpc_uio(struct vnode *vp, struct uio *uiop, 1449 int *iomode, int *must_commit) 1450 { 1451 u_int32_t *tl; 1452 int32_t backup; 1453 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1454 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1455 int committed = NFSV3WRITE_FILESYNC; 1456 struct nfsm_info info; 1457 1458 info.mrep = NULL; 1459 info.v3 = NFS_ISV3(vp); 1460 1461 #ifndef DIAGNOSTIC 1462 if (uiop->uio_iovcnt != 1) 1463 panic("nfs: writerpc iovcnt > 1"); 1464 #endif 1465 *must_commit = 0; 1466 tsiz = uiop->uio_resid; 1467 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1468 return (EFBIG); 1469 while (tsiz > 0) { 1470 nfsstats.rpccnt[NFSPROC_WRITE]++; 1471 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1472 nfsm_reqhead(&info, vp, NFSPROC_WRITE, 1473 NFSX_FH(info.v3) + 5 * NFSX_UNSIGNED + 1474 nfsm_rndup(len)); 1475 ERROROUT(nfsm_fhtom(&info, vp)); 1476 if (info.v3) { 1477 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 1478 txdr_hyper(uiop->uio_offset, tl); 1479 tl += 2; 1480 *tl++ = txdr_unsigned(len); 1481 *tl++ = txdr_unsigned(*iomode); 1482 *tl = txdr_unsigned(len); 1483 } else { 1484 u_int32_t x; 1485 1486 tl = nfsm_build(&info, 4 * NFSX_UNSIGNED); 1487 /* Set both "begin" and "current" to non-garbage. */ 1488 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1489 *tl++ = x; /* "begin offset" */ 1490 *tl++ = x; /* "current offset" */ 1491 x = txdr_unsigned(len); 1492 *tl++ = x; /* total to this offset */ 1493 *tl = x; /* size of this write */ 1494 } 1495 ERROROUT(nfsm_uiotom(&info, uiop, len)); 1496 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_WRITE, uiop->uio_td, 1497 nfs_vpcred(vp, ND_WRITE), &error)); 1498 if (info.v3) { 1499 /* 1500 * The write RPC returns a before and after mtime. The 1501 * nfsm_wcc_data() macro checks the before n_mtime 1502 * against the before time and stores the after time 1503 * in the nfsnode's cached vattr and n_mtime field. 1504 * The NRMODIFIED bit will be set if the before 1505 * time did not match the original mtime. 1506 */ 1507 wccflag = NFSV3_WCCCHK; 1508 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 1509 if (error == 0) { 1510 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF)); 1511 rlen = fxdr_unsigned(int, *tl++); 1512 if (rlen == 0) { 1513 error = NFSERR_IO; 1514 m_freem(info.mrep); 1515 info.mrep = NULL; 1516 break; 1517 } else if (rlen < len) { 1518 backup = len - rlen; 1519 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base - backup; 1520 uiop->uio_iov->iov_len += backup; 1521 uiop->uio_offset -= backup; 1522 uiop->uio_resid += backup; 1523 len = rlen; 1524 } 1525 commit = fxdr_unsigned(int, *tl++); 1526 1527 /* 1528 * Return the lowest committment level 1529 * obtained by any of the RPCs. 1530 */ 1531 if (committed == NFSV3WRITE_FILESYNC) 1532 committed = commit; 1533 else if (committed == NFSV3WRITE_DATASYNC && 1534 commit == NFSV3WRITE_UNSTABLE) 1535 committed = commit; 1536 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1537 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1538 NFSX_V3WRITEVERF); 1539 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1540 } else if (bcmp((caddr_t)tl, 1541 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1542 *must_commit = 1; 1543 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1544 NFSX_V3WRITEVERF); 1545 } 1546 } 1547 } else { 1548 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1549 } 1550 m_freem(info.mrep); 1551 info.mrep = NULL; 1552 if (error) 1553 break; 1554 tsiz -= len; 1555 } 1556 nfsmout: 1557 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1558 committed = NFSV3WRITE_FILESYNC; 1559 *iomode = committed; 1560 if (error) 1561 uiop->uio_resid = tsiz; 1562 return (error); 1563 } 1564 1565 /* 1566 * nfs mknod rpc 1567 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1568 * mode set to specify the file type and the size field for rdev. 1569 */ 1570 static int 1571 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1572 struct vattr *vap) 1573 { 1574 struct nfsv2_sattr *sp; 1575 u_int32_t *tl; 1576 struct vnode *newvp = NULL; 1577 struct nfsnode *np = NULL; 1578 struct vattr vattr; 1579 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1580 int rmajor, rminor; 1581 struct nfsm_info info; 1582 1583 info.mrep = NULL; 1584 info.v3 = NFS_ISV3(dvp); 1585 1586 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1587 rmajor = txdr_unsigned(vap->va_rmajor); 1588 rminor = txdr_unsigned(vap->va_rminor); 1589 } else if (vap->va_type == VFIFO || vap->va_type == VSOCK) { 1590 rmajor = nfs_xdrneg1; 1591 rminor = nfs_xdrneg1; 1592 } else { 1593 return (EOPNOTSUPP); 1594 } 1595 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1596 return (error); 1597 } 1598 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1599 nfsm_reqhead(&info, dvp, NFSPROC_MKNOD, 1600 NFSX_FH(info.v3) + 4 * NFSX_UNSIGNED + 1601 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1602 ERROROUT(nfsm_fhtom(&info, dvp)); 1603 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1604 NFS_MAXNAMLEN)); 1605 if (info.v3) { 1606 tl = nfsm_build(&info, NFSX_UNSIGNED); 1607 *tl++ = vtonfsv3_type(vap->va_type); 1608 nfsm_v3attrbuild(&info, vap, FALSE); 1609 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1610 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1611 *tl++ = txdr_unsigned(vap->va_rmajor); 1612 *tl = txdr_unsigned(vap->va_rminor); 1613 } 1614 } else { 1615 sp = nfsm_build(&info, NFSX_V2SATTR); 1616 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1617 sp->sa_uid = nfs_xdrneg1; 1618 sp->sa_gid = nfs_xdrneg1; 1619 sp->sa_size = makeudev(rmajor, rminor); 1620 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1621 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1622 } 1623 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKNOD, cnp->cn_td, 1624 cnp->cn_cred, &error)); 1625 if (!error) { 1626 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1627 if (!gotvp) { 1628 if (newvp) { 1629 vput(newvp); 1630 newvp = NULL; 1631 } 1632 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1633 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1634 if (!error) 1635 newvp = NFSTOV(np); 1636 } 1637 } 1638 if (info.v3) { 1639 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1640 } 1641 m_freem(info.mrep); 1642 info.mrep = NULL; 1643 nfsmout: 1644 if (error) { 1645 if (newvp) 1646 vput(newvp); 1647 } else { 1648 *vpp = newvp; 1649 } 1650 VTONFS(dvp)->n_flag |= NLMODIFIED; 1651 if (!wccflag) 1652 VTONFS(dvp)->n_attrstamp = 0; 1653 return (error); 1654 } 1655 1656 /* 1657 * nfs mknod vop 1658 * just call nfs_mknodrpc() to do the work. 1659 * 1660 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1661 * struct componentname *a_cnp, struct vattr *a_vap) 1662 */ 1663 /* ARGSUSED */ 1664 static int 1665 nfs_mknod(struct vop_old_mknod_args *ap) 1666 { 1667 struct nfsmount *nmp = VFSTONFS(ap->a_dvp->v_mount); 1668 int error; 1669 1670 lwkt_gettoken(&nmp->nm_token); 1671 error = nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1672 lwkt_reltoken(&nmp->nm_token); 1673 if (error == 0) 1674 nfs_knote(ap->a_dvp, NOTE_WRITE); 1675 1676 return error; 1677 } 1678 1679 static u_long create_verf; 1680 /* 1681 * nfs file create call 1682 * 1683 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1684 * struct componentname *a_cnp, struct vattr *a_vap) 1685 */ 1686 static int 1687 nfs_create(struct vop_old_create_args *ap) 1688 { 1689 struct vnode *dvp = ap->a_dvp; 1690 struct vattr *vap = ap->a_vap; 1691 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 1692 struct componentname *cnp = ap->a_cnp; 1693 struct nfsv2_sattr *sp; 1694 u_int32_t *tl; 1695 struct nfsnode *np = NULL; 1696 struct vnode *newvp = NULL; 1697 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1698 struct vattr vattr; 1699 struct nfsm_info info; 1700 1701 info.mrep = NULL; 1702 info.v3 = NFS_ISV3(dvp); 1703 lwkt_gettoken(&nmp->nm_token); 1704 1705 /* 1706 * Oops, not for me.. 1707 */ 1708 if (vap->va_type == VSOCK) { 1709 error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); 1710 lwkt_reltoken(&nmp->nm_token); 1711 return error; 1712 } 1713 1714 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1715 lwkt_reltoken(&nmp->nm_token); 1716 return (error); 1717 } 1718 if (vap->va_vaflags & VA_EXCLUSIVE) 1719 fmode |= O_EXCL; 1720 again: 1721 nfsstats.rpccnt[NFSPROC_CREATE]++; 1722 nfsm_reqhead(&info, dvp, NFSPROC_CREATE, 1723 NFSX_FH(info.v3) + 2 * NFSX_UNSIGNED + 1724 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1725 ERROROUT(nfsm_fhtom(&info, dvp)); 1726 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1727 NFS_MAXNAMLEN)); 1728 if (info.v3) { 1729 tl = nfsm_build(&info, NFSX_UNSIGNED); 1730 if (fmode & O_EXCL) { 1731 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1732 tl = nfsm_build(&info, NFSX_V3CREATEVERF); 1733 #ifdef INET 1734 if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) 1735 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia)->sin_addr.s_addr; 1736 else 1737 #endif 1738 *tl++ = create_verf; 1739 *tl = ++create_verf; 1740 } else { 1741 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1742 nfsm_v3attrbuild(&info, vap, FALSE); 1743 } 1744 } else { 1745 sp = nfsm_build(&info, NFSX_V2SATTR); 1746 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1747 sp->sa_uid = nfs_xdrneg1; 1748 sp->sa_gid = nfs_xdrneg1; 1749 sp->sa_size = 0; 1750 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1751 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1752 } 1753 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_CREATE, cnp->cn_td, 1754 cnp->cn_cred, &error)); 1755 if (error == 0) { 1756 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1757 if (!gotvp) { 1758 if (newvp) { 1759 vput(newvp); 1760 newvp = NULL; 1761 } 1762 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1763 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1764 if (!error) 1765 newvp = NFSTOV(np); 1766 } 1767 } 1768 if (info.v3) { 1769 if (error == 0) 1770 error = nfsm_wcc_data(&info, dvp, &wccflag); 1771 else 1772 (void)nfsm_wcc_data(&info, dvp, &wccflag); 1773 } 1774 m_freem(info.mrep); 1775 info.mrep = NULL; 1776 nfsmout: 1777 if (error) { 1778 if (info.v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1779 KKASSERT(newvp == NULL); 1780 fmode &= ~O_EXCL; 1781 goto again; 1782 } 1783 } else if (info.v3 && (fmode & O_EXCL)) { 1784 /* 1785 * We are normally called with only a partially initialized 1786 * VAP. Since the NFSv3 spec says that server may use the 1787 * file attributes to store the verifier, the spec requires 1788 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1789 * in atime, but we can't really assume that all servers will 1790 * so we ensure that our SETATTR sets both atime and mtime. 1791 */ 1792 if (vap->va_mtime.tv_sec == VNOVAL) 1793 vfs_timestamp(&vap->va_mtime); 1794 if (vap->va_atime.tv_sec == VNOVAL) 1795 vap->va_atime = vap->va_mtime; 1796 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1797 } 1798 if (error == 0) { 1799 /* 1800 * The new np may have enough info for access 1801 * checks, make sure rucred and wucred are 1802 * initialized for read and write rpc's. 1803 */ 1804 np = VTONFS(newvp); 1805 if (np->n_rucred == NULL) 1806 np->n_rucred = crhold(cnp->cn_cred); 1807 if (np->n_wucred == NULL) 1808 np->n_wucred = crhold(cnp->cn_cred); 1809 *ap->a_vpp = newvp; 1810 nfs_knote(dvp, NOTE_WRITE); 1811 } else if (newvp) { 1812 vput(newvp); 1813 } 1814 VTONFS(dvp)->n_flag |= NLMODIFIED; 1815 if (!wccflag) 1816 VTONFS(dvp)->n_attrstamp = 0; 1817 lwkt_reltoken(&nmp->nm_token); 1818 return (error); 1819 } 1820 1821 /* 1822 * nfs file remove call 1823 * To try and make nfs semantics closer to ufs semantics, a file that has 1824 * other processes using the vnode is renamed instead of removed and then 1825 * removed later on the last close. 1826 * - If v_refcnt > 1 1827 * If a rename is not already in the works 1828 * call nfs_sillyrename() to set it up 1829 * else 1830 * do the remove rpc 1831 * 1832 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1833 * struct componentname *a_cnp) 1834 */ 1835 static int 1836 nfs_remove(struct vop_old_remove_args *ap) 1837 { 1838 struct vnode *vp = ap->a_vp; 1839 struct vnode *dvp = ap->a_dvp; 1840 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 1841 struct componentname *cnp = ap->a_cnp; 1842 struct nfsnode *np = VTONFS(vp); 1843 int error = 0; 1844 struct vattr vattr; 1845 1846 lwkt_gettoken(&nmp->nm_token); 1847 #ifndef DIAGNOSTIC 1848 if (VREFCNT(vp) < 1) 1849 panic("nfs_remove: bad v_refcnt"); 1850 #endif 1851 if (vp->v_type == VDIR) { 1852 error = EPERM; 1853 } else if (VREFCNT(vp) == 1 || (np->n_sillyrename && 1854 VOP_GETATTR(vp, &vattr) == 0 && vattr.va_nlink > 1)) { 1855 /* 1856 * Force finalization so the VOP_INACTIVE() call is not delayed. 1857 * This prevents cred structures from building up in nfsnodes 1858 * for deleted files. 1859 */ 1860 atomic_set_int(&vp->v_refcnt, VREF_FINALIZE); 1861 np->n_flag |= NREMOVED; 1862 1863 /* 1864 * Throw away biocache buffers, mainly to avoid 1865 * unnecessary delayed writes later. 1866 */ 1867 error = nfs_vinvalbuf(vp, 0, 1); 1868 /* Do the rpc */ 1869 if (error != EINTR) { 1870 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1871 cnp->cn_namelen, 1872 cnp->cn_cred, cnp->cn_td); 1873 } 1874 1875 /* 1876 * Kludge City: If the first reply to the remove rpc is lost.. 1877 * the reply to the retransmitted request will be ENOENT 1878 * since the file was in fact removed 1879 * Therefore, we cheat and return success. 1880 */ 1881 if (error == ENOENT) 1882 error = 0; 1883 } else if (!np->n_sillyrename) { 1884 error = nfs_sillyrename(dvp, vp, cnp); 1885 } 1886 np->n_attrstamp = 0; 1887 lwkt_reltoken(&nmp->nm_token); 1888 if (error == 0) { 1889 nfs_knote(vp, NOTE_DELETE); 1890 nfs_knote(dvp, NOTE_WRITE); 1891 } 1892 1893 return (error); 1894 } 1895 1896 /* 1897 * nfs file remove rpc called from nfs_inactive 1898 * 1899 * NOTE: s_dvp can be VBAD during a forced unmount. 1900 */ 1901 int 1902 nfs_removeit(struct sillyrename *sp) 1903 { 1904 if (sp->s_dvp->v_type == VBAD) 1905 return(0); 1906 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1907 sp->s_cred, NULL)); 1908 } 1909 1910 /* 1911 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1912 */ 1913 static int 1914 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1915 struct ucred *cred, struct thread *td) 1916 { 1917 int error = 0, wccflag = NFSV3_WCCRATTR; 1918 struct nfsm_info info; 1919 1920 info.mrep = NULL; 1921 info.v3 = NFS_ISV3(dvp); 1922 1923 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1924 nfsm_reqhead(&info, dvp, NFSPROC_REMOVE, 1925 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1926 ERROROUT(nfsm_fhtom(&info, dvp)); 1927 ERROROUT(nfsm_strtom(&info, name, namelen, NFS_MAXNAMLEN)); 1928 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_REMOVE, td, cred, &error)); 1929 if (info.v3) { 1930 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1931 } 1932 m_freem(info.mrep); 1933 info.mrep = NULL; 1934 nfsmout: 1935 VTONFS(dvp)->n_flag |= NLMODIFIED; 1936 if (!wccflag) 1937 VTONFS(dvp)->n_attrstamp = 0; 1938 return (error); 1939 } 1940 1941 /* 1942 * nfs file rename call 1943 * 1944 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1945 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1946 * struct vnode *a_tvp, struct componentname *a_tcnp) 1947 */ 1948 static int 1949 nfs_rename(struct vop_old_rename_args *ap) 1950 { 1951 struct vnode *fvp = ap->a_fvp; 1952 struct vnode *tvp = ap->a_tvp; 1953 struct vnode *fdvp = ap->a_fdvp; 1954 struct vnode *tdvp = ap->a_tdvp; 1955 struct componentname *tcnp = ap->a_tcnp; 1956 struct componentname *fcnp = ap->a_fcnp; 1957 struct nfsmount *nmp = VFSTONFS(fdvp->v_mount); 1958 int error; 1959 1960 lwkt_gettoken(&nmp->nm_token); 1961 1962 /* 1963 * Force finalization so the VOP_INACTIVE() call is not delayed. 1964 * This prevents cred structures from building up in nfsnodes 1965 * for deleted files. 1966 */ 1967 if (tvp) { 1968 atomic_set_int(&tvp->v_refcnt, VREF_FINALIZE); 1969 if (VTONFS(tvp)) 1970 VTONFS(tvp)->n_flag |= NREMOVED; 1971 } 1972 1973 /* Check for cross-device rename */ 1974 if ((fvp->v_mount != tdvp->v_mount) || 1975 (tvp && (fvp->v_mount != tvp->v_mount))) { 1976 error = EXDEV; 1977 goto out; 1978 } 1979 1980 /* 1981 * We shouldn't have to flush fvp on rename for most server-side 1982 * filesystems as the file handle should not change. Unfortunately 1983 * the inode for some filesystems (msdosfs) might be tied to the 1984 * file name or directory position so to be completely safe 1985 * vfs.nfs.flush_on_rename is set by default. Clear to improve 1986 * performance. 1987 * 1988 * We must flush tvp on rename because it might become stale on the 1989 * server after the rename. 1990 */ 1991 if (nfs_flush_on_rename) 1992 VOP_FSYNC(fvp, MNT_WAIT, 0); 1993 if (tvp) 1994 VOP_FSYNC(tvp, MNT_WAIT, 0); 1995 1996 /* 1997 * If the tvp exists and is in use, sillyrename it before doing the 1998 * rename of the new file over it. 1999 * 2000 * XXX Can't sillyrename a directory. 2001 * 2002 * We do not attempt to do any namecache purges in this old API 2003 * routine. The new API compat functions have access to the actual 2004 * namecache structures and will do it for us. 2005 */ 2006 if (tvp && VREFCNT(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && 2007 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 2008 nfs_knote(tvp, NOTE_DELETE); 2009 vput(tvp); 2010 tvp = NULL; 2011 } else if (tvp) { 2012 nfs_knote(tvp, NOTE_DELETE); 2013 } 2014 2015 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 2016 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 2017 tcnp->cn_td); 2018 2019 out: 2020 if (error == 0) { 2021 nfs_knote(fdvp, NOTE_WRITE); 2022 nfs_knote(tdvp, NOTE_WRITE); 2023 nfs_knote(fvp, NOTE_RENAME); 2024 } 2025 lwkt_reltoken(&nmp->nm_token); 2026 if (tdvp == tvp) 2027 vrele(tdvp); 2028 else 2029 vput(tdvp); 2030 if (tvp) 2031 vput(tvp); 2032 vrele(fdvp); 2033 vrele(fvp); 2034 /* 2035 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 2036 */ 2037 if (error == ENOENT) 2038 error = 0; 2039 return (error); 2040 } 2041 2042 /* 2043 * nfs file rename rpc called from nfs_remove() above 2044 */ 2045 static int 2046 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 2047 struct sillyrename *sp) 2048 { 2049 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 2050 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 2051 } 2052 2053 /* 2054 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 2055 */ 2056 static int 2057 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 2058 struct vnode *tdvp, const char *tnameptr, int tnamelen, 2059 struct ucred *cred, struct thread *td) 2060 { 2061 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 2062 struct nfsm_info info; 2063 2064 info.mrep = NULL; 2065 info.v3 = NFS_ISV3(fdvp); 2066 2067 nfsstats.rpccnt[NFSPROC_RENAME]++; 2068 nfsm_reqhead(&info, fdvp, NFSPROC_RENAME, 2069 (NFSX_FH(info.v3) + NFSX_UNSIGNED)*2 + 2070 nfsm_rndup(fnamelen) + nfsm_rndup(tnamelen)); 2071 ERROROUT(nfsm_fhtom(&info, fdvp)); 2072 ERROROUT(nfsm_strtom(&info, fnameptr, fnamelen, NFS_MAXNAMLEN)); 2073 ERROROUT(nfsm_fhtom(&info, tdvp)); 2074 ERROROUT(nfsm_strtom(&info, tnameptr, tnamelen, NFS_MAXNAMLEN)); 2075 NEGKEEPOUT(nfsm_request(&info, fdvp, NFSPROC_RENAME, td, cred, &error)); 2076 if (info.v3) { 2077 ERROROUT(nfsm_wcc_data(&info, fdvp, &fwccflag)); 2078 ERROROUT(nfsm_wcc_data(&info, tdvp, &twccflag)); 2079 } 2080 m_freem(info.mrep); 2081 info.mrep = NULL; 2082 nfsmout: 2083 VTONFS(fdvp)->n_flag |= NLMODIFIED; 2084 VTONFS(tdvp)->n_flag |= NLMODIFIED; 2085 if (!fwccflag) 2086 VTONFS(fdvp)->n_attrstamp = 0; 2087 if (!twccflag) 2088 VTONFS(tdvp)->n_attrstamp = 0; 2089 return (error); 2090 } 2091 2092 /* 2093 * nfs hard link create call 2094 * 2095 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 2096 * struct componentname *a_cnp) 2097 */ 2098 static int 2099 nfs_link(struct vop_old_link_args *ap) 2100 { 2101 struct vnode *vp = ap->a_vp; 2102 struct vnode *tdvp = ap->a_tdvp; 2103 struct nfsmount *nmp = VFSTONFS(tdvp->v_mount); 2104 struct componentname *cnp = ap->a_cnp; 2105 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 2106 struct nfsm_info info; 2107 2108 if (vp->v_mount != tdvp->v_mount) { 2109 return (EXDEV); 2110 } 2111 lwkt_gettoken(&nmp->nm_token); 2112 2113 /* 2114 * The attribute cache may get out of sync with the server on link. 2115 * Pushing writes to the server before handle was inherited from 2116 * long long ago and it is unclear if we still need to do this. 2117 * Defaults to off. 2118 */ 2119 if (nfs_flush_on_hlink) 2120 VOP_FSYNC(vp, MNT_WAIT, 0); 2121 2122 info.mrep = NULL; 2123 info.v3 = NFS_ISV3(vp); 2124 2125 nfsstats.rpccnt[NFSPROC_LINK]++; 2126 nfsm_reqhead(&info, vp, NFSPROC_LINK, 2127 NFSX_FH(info.v3) * 2 + NFSX_UNSIGNED + 2128 nfsm_rndup(cnp->cn_namelen)); 2129 ERROROUT(nfsm_fhtom(&info, vp)); 2130 ERROROUT(nfsm_fhtom(&info, tdvp)); 2131 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2132 NFS_MAXNAMLEN)); 2133 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_LINK, cnp->cn_td, 2134 cnp->cn_cred, &error)); 2135 if (info.v3) { 2136 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2137 NFS_LATTR_NOSHRINK)); 2138 ERROROUT(nfsm_wcc_data(&info, tdvp, &wccflag)); 2139 } 2140 m_freem(info.mrep); 2141 info.mrep = NULL; 2142 nfsmout: 2143 VTONFS(tdvp)->n_flag |= NLMODIFIED; 2144 if (!attrflag) 2145 VTONFS(vp)->n_attrstamp = 0; 2146 if (!wccflag) 2147 VTONFS(tdvp)->n_attrstamp = 0; 2148 /* 2149 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 2150 */ 2151 if (error == EEXIST) 2152 error = 0; 2153 lwkt_reltoken(&nmp->nm_token); 2154 if (error == 0) { 2155 nfs_knote(vp, NOTE_LINK); 2156 nfs_knote(tdvp, NOTE_WRITE); 2157 } 2158 2159 return (error); 2160 } 2161 2162 /* 2163 * nfs symbolic link create call 2164 * 2165 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 2166 * struct componentname *a_cnp, struct vattr *a_vap, 2167 * char *a_target) 2168 */ 2169 static int 2170 nfs_symlink(struct vop_old_symlink_args *ap) 2171 { 2172 struct vnode *dvp = ap->a_dvp; 2173 struct vattr *vap = ap->a_vap; 2174 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2175 struct componentname *cnp = ap->a_cnp; 2176 struct nfsv2_sattr *sp; 2177 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2178 struct vnode *newvp = NULL; 2179 struct nfsm_info info; 2180 2181 info.mrep = NULL; 2182 info.v3 = NFS_ISV3(dvp); 2183 lwkt_gettoken(&nmp->nm_token); 2184 2185 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2186 slen = strlen(ap->a_target); 2187 nfsm_reqhead(&info, dvp, NFSPROC_SYMLINK, 2188 NFSX_FH(info.v3) + 2*NFSX_UNSIGNED + 2189 nfsm_rndup(cnp->cn_namelen) + 2190 nfsm_rndup(slen) + NFSX_SATTR(info.v3)); 2191 ERROROUT(nfsm_fhtom(&info, dvp)); 2192 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2193 NFS_MAXNAMLEN)); 2194 if (info.v3) { 2195 nfsm_v3attrbuild(&info, vap, FALSE); 2196 } 2197 ERROROUT(nfsm_strtom(&info, ap->a_target, slen, NFS_MAXPATHLEN)); 2198 if (info.v3 == 0) { 2199 sp = nfsm_build(&info, NFSX_V2SATTR); 2200 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2201 sp->sa_uid = nfs_xdrneg1; 2202 sp->sa_gid = nfs_xdrneg1; 2203 sp->sa_size = nfs_xdrneg1; 2204 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2205 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2206 } 2207 2208 /* 2209 * Issue the NFS request and get the rpc response. 2210 * 2211 * Only NFSv3 responses returning an error of 0 actually return 2212 * a file handle that can be converted into newvp without having 2213 * to do an extra lookup rpc. 2214 */ 2215 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_SYMLINK, cnp->cn_td, 2216 cnp->cn_cred, &error)); 2217 if (info.v3) { 2218 if (error == 0) { 2219 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2220 } 2221 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2222 } 2223 2224 /* 2225 * out code jumps -> here, mrep is also freed. 2226 */ 2227 2228 m_freem(info.mrep); 2229 info.mrep = NULL; 2230 nfsmout: 2231 2232 /* 2233 * If we get an EEXIST error, silently convert it to no-error 2234 * in case of an NFS retry. 2235 */ 2236 if (error == EEXIST) 2237 error = 0; 2238 2239 /* 2240 * If we do not have (or no longer have) an error, and we could 2241 * not extract the newvp from the response due to the request being 2242 * NFSv2 or the error being EEXIST. We have to do a lookup in order 2243 * to obtain a newvp to return. 2244 */ 2245 if (error == 0 && newvp == NULL) { 2246 struct nfsnode *np = NULL; 2247 2248 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2249 cnp->cn_cred, cnp->cn_td, &np); 2250 if (!error) 2251 newvp = NFSTOV(np); 2252 } 2253 if (error) { 2254 if (newvp) 2255 vput(newvp); 2256 } else { 2257 *ap->a_vpp = newvp; 2258 } 2259 VTONFS(dvp)->n_flag |= NLMODIFIED; 2260 if (!wccflag) 2261 VTONFS(dvp)->n_attrstamp = 0; 2262 if (error == 0 && *ap->a_vpp) 2263 nfs_knote(*ap->a_vpp, NOTE_WRITE); 2264 lwkt_reltoken(&nmp->nm_token); 2265 2266 return (error); 2267 } 2268 2269 /* 2270 * nfs make dir call 2271 * 2272 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 2273 * struct componentname *a_cnp, struct vattr *a_vap) 2274 */ 2275 static int 2276 nfs_mkdir(struct vop_old_mkdir_args *ap) 2277 { 2278 struct vnode *dvp = ap->a_dvp; 2279 struct vattr *vap = ap->a_vap; 2280 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2281 struct componentname *cnp = ap->a_cnp; 2282 struct nfsv2_sattr *sp; 2283 struct nfsnode *np = NULL; 2284 struct vnode *newvp = NULL; 2285 struct vattr vattr; 2286 int error = 0, wccflag = NFSV3_WCCRATTR; 2287 int gotvp = 0; 2288 int len; 2289 struct nfsm_info info; 2290 2291 info.mrep = NULL; 2292 info.v3 = NFS_ISV3(dvp); 2293 lwkt_gettoken(&nmp->nm_token); 2294 2295 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 2296 lwkt_reltoken(&nmp->nm_token); 2297 return (error); 2298 } 2299 len = cnp->cn_namelen; 2300 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2301 nfsm_reqhead(&info, dvp, NFSPROC_MKDIR, 2302 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2303 nfsm_rndup(len) + NFSX_SATTR(info.v3)); 2304 ERROROUT(nfsm_fhtom(&info, dvp)); 2305 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 2306 if (info.v3) { 2307 nfsm_v3attrbuild(&info, vap, FALSE); 2308 } else { 2309 sp = nfsm_build(&info, NFSX_V2SATTR); 2310 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2311 sp->sa_uid = nfs_xdrneg1; 2312 sp->sa_gid = nfs_xdrneg1; 2313 sp->sa_size = nfs_xdrneg1; 2314 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2315 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2316 } 2317 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKDIR, cnp->cn_td, 2318 cnp->cn_cred, &error)); 2319 if (error == 0) { 2320 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2321 } 2322 if (info.v3) { 2323 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2324 } 2325 m_freem(info.mrep); 2326 info.mrep = NULL; 2327 nfsmout: 2328 VTONFS(dvp)->n_flag |= NLMODIFIED; 2329 if (!wccflag) 2330 VTONFS(dvp)->n_attrstamp = 0; 2331 /* 2332 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2333 * if we can succeed in looking up the directory. 2334 */ 2335 if (error == EEXIST || (!error && !gotvp)) { 2336 if (newvp) { 2337 vrele(newvp); 2338 newvp = NULL; 2339 } 2340 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2341 cnp->cn_td, &np); 2342 if (!error) { 2343 newvp = NFSTOV(np); 2344 if (newvp->v_type != VDIR) 2345 error = EEXIST; 2346 } 2347 } 2348 if (error) { 2349 if (newvp) 2350 vrele(newvp); 2351 } else { 2352 nfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 2353 *ap->a_vpp = newvp; 2354 } 2355 lwkt_reltoken(&nmp->nm_token); 2356 return (error); 2357 } 2358 2359 /* 2360 * nfs remove directory call 2361 * 2362 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2363 * struct componentname *a_cnp) 2364 */ 2365 static int 2366 nfs_rmdir(struct vop_old_rmdir_args *ap) 2367 { 2368 struct vnode *vp = ap->a_vp; 2369 struct vnode *dvp = ap->a_dvp; 2370 struct nfsmount *nmp = VFSTONFS(dvp->v_mount); 2371 struct componentname *cnp = ap->a_cnp; 2372 int error = 0, wccflag = NFSV3_WCCRATTR; 2373 struct nfsm_info info; 2374 2375 info.mrep = NULL; 2376 info.v3 = NFS_ISV3(dvp); 2377 2378 if (dvp == vp) 2379 return (EINVAL); 2380 2381 lwkt_gettoken(&nmp->nm_token); 2382 2383 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2384 nfsm_reqhead(&info, dvp, NFSPROC_RMDIR, 2385 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2386 nfsm_rndup(cnp->cn_namelen)); 2387 ERROROUT(nfsm_fhtom(&info, dvp)); 2388 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2389 NFS_MAXNAMLEN)); 2390 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_RMDIR, cnp->cn_td, 2391 cnp->cn_cred, &error)); 2392 if (info.v3) { 2393 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2394 } 2395 m_freem(info.mrep); 2396 info.mrep = NULL; 2397 nfsmout: 2398 VTONFS(dvp)->n_flag |= NLMODIFIED; 2399 if (!wccflag) 2400 VTONFS(dvp)->n_attrstamp = 0; 2401 /* 2402 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2403 */ 2404 if (error == ENOENT) 2405 error = 0; 2406 else 2407 nfs_knote(dvp, NOTE_WRITE | NOTE_LINK); 2408 lwkt_reltoken(&nmp->nm_token); 2409 2410 return (error); 2411 } 2412 2413 /* 2414 * nfs readdir call 2415 * 2416 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2417 */ 2418 static int 2419 nfs_readdir(struct vop_readdir_args *ap) 2420 { 2421 struct vnode *vp = ap->a_vp; 2422 struct nfsnode *np = VTONFS(vp); 2423 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2424 struct uio *uio = ap->a_uio; 2425 int tresid, error; 2426 struct vattr vattr; 2427 2428 if (vp->v_type != VDIR) 2429 return (EPERM); 2430 2431 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM); 2432 if (error) 2433 return (error); 2434 2435 lwkt_gettoken(&nmp->nm_token); 2436 2437 /* 2438 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2439 * and then check that is still valid, or if this is an NQNFS mount 2440 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2441 * VOP_GETATTR() does not necessarily go to the wire. 2442 */ 2443 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2444 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2445 if (VOP_GETATTR(vp, &vattr) == 0 && 2446 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2447 ) { 2448 nfsstats.direofcache_hits++; 2449 goto done; 2450 } 2451 } 2452 2453 /* 2454 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2455 * own cache coherency checks so we do not have to. 2456 */ 2457 tresid = uio->uio_resid; 2458 error = nfs_bioread(vp, uio, 0); 2459 2460 if (!error && uio->uio_resid == tresid) 2461 nfsstats.direofcache_misses++; 2462 done: 2463 lwkt_reltoken(&nmp->nm_token); 2464 vn_unlock(vp); 2465 2466 return (error); 2467 } 2468 2469 /* 2470 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2471 * 2472 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2473 * offset/block and converts the nfs formatted directory entries for userland 2474 * consumption as well as deals with offsets into the middle of blocks. 2475 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2476 * be block-bounded. It must convert to cookies for the actual RPC. 2477 */ 2478 int 2479 nfs_readdirrpc_uio(struct vnode *vp, struct uio *uiop) 2480 { 2481 int len, left; 2482 struct nfs_dirent *dp = NULL; 2483 u_int32_t *tl; 2484 nfsuint64 *cookiep; 2485 caddr_t cp; 2486 nfsuint64 cookie; 2487 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2488 struct nfsnode *dnp = VTONFS(vp); 2489 u_quad_t fileno; 2490 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2491 int attrflag; 2492 struct nfsm_info info; 2493 2494 info.mrep = NULL; 2495 info.v3 = NFS_ISV3(vp); 2496 2497 #ifndef DIAGNOSTIC 2498 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2499 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2500 panic("nfs readdirrpc bad uio"); 2501 #endif 2502 2503 /* 2504 * If there is no cookie, assume directory was stale. 2505 */ 2506 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2507 if (cookiep) 2508 cookie = *cookiep; 2509 else 2510 return (NFSERR_BAD_COOKIE); 2511 /* 2512 * Loop around doing readdir rpc's of size nm_readdirsize 2513 * truncated to a multiple of DIRBLKSIZ. 2514 * The stopping criteria is EOF or buffer full. 2515 */ 2516 while (more_dirs && bigenough) { 2517 nfsstats.rpccnt[NFSPROC_READDIR]++; 2518 nfsm_reqhead(&info, vp, NFSPROC_READDIR, 2519 NFSX_FH(info.v3) + NFSX_READDIR(info.v3)); 2520 ERROROUT(nfsm_fhtom(&info, vp)); 2521 if (info.v3) { 2522 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 2523 *tl++ = cookie.nfsuquad[0]; 2524 *tl++ = cookie.nfsuquad[1]; 2525 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2526 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2527 } else { 2528 /* 2529 * WARNING! HAMMER DIRECTORIES WILL NOT WORK WELL 2530 * WITH NFSv2!!! There's nothing I can really do 2531 * about it other than to hope the server supports 2532 * rdirplus w/NFSv2. 2533 */ 2534 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 2535 *tl++ = cookie.nfsuquad[0]; 2536 } 2537 *tl = txdr_unsigned(nmp->nm_readdirsize); 2538 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIR, 2539 uiop->uio_td, 2540 nfs_vpcred(vp, ND_READ), &error)); 2541 if (info.v3) { 2542 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2543 NFS_LATTR_NOSHRINK)); 2544 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2545 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2546 dnp->n_cookieverf.nfsuquad[1] = *tl; 2547 } 2548 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2549 more_dirs = fxdr_unsigned(int, *tl); 2550 2551 /* loop thru the dir entries, converting them to std form */ 2552 while (more_dirs && bigenough) { 2553 if (info.v3) { 2554 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2555 fileno = fxdr_hyper(tl); 2556 len = fxdr_unsigned(int, *(tl + 2)); 2557 } else { 2558 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2559 fileno = fxdr_unsigned(u_quad_t, *tl++); 2560 len = fxdr_unsigned(int, *tl); 2561 } 2562 if (len <= 0 || len > NFS_MAXNAMLEN) { 2563 error = EBADRPC; 2564 m_freem(info.mrep); 2565 info.mrep = NULL; 2566 goto nfsmout; 2567 } 2568 2569 /* 2570 * len is the number of bytes in the path element 2571 * name, not including the \0 termination. 2572 * 2573 * tlen is the number of bytes w have to reserve for 2574 * the path element name. 2575 */ 2576 tlen = nfsm_rndup(len); 2577 if (tlen == len) 2578 tlen += 4; /* To ensure null termination */ 2579 2580 /* 2581 * If the entry would cross a DIRBLKSIZ boundary, 2582 * extend the previous nfs_dirent to cover the 2583 * remaining space. 2584 */ 2585 left = DIRBLKSIZ - blksiz; 2586 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2587 dp->nfs_reclen += left; 2588 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2589 uiop->uio_iov->iov_len -= left; 2590 uiop->uio_offset += left; 2591 uiop->uio_resid -= left; 2592 blksiz = 0; 2593 } 2594 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2595 bigenough = 0; 2596 if (bigenough) { 2597 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2598 dp->nfs_ino = fileno; 2599 dp->nfs_namlen = len; 2600 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2601 dp->nfs_type = DT_UNKNOWN; 2602 blksiz += dp->nfs_reclen; 2603 if (blksiz == DIRBLKSIZ) 2604 blksiz = 0; 2605 uiop->uio_offset += sizeof(struct nfs_dirent); 2606 uiop->uio_resid -= sizeof(struct nfs_dirent); 2607 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2608 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2609 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2610 2611 /* 2612 * The uiop has advanced by nfs_dirent + len 2613 * but really needs to advance by 2614 * nfs_dirent + tlen 2615 */ 2616 cp = uiop->uio_iov->iov_base; 2617 tlen -= len; 2618 *cp = '\0'; /* null terminate */ 2619 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2620 uiop->uio_iov->iov_len -= tlen; 2621 uiop->uio_offset += tlen; 2622 uiop->uio_resid -= tlen; 2623 } else { 2624 /* 2625 * NFS strings must be rounded up (nfsm_myouio 2626 * handled that in the bigenough case). 2627 */ 2628 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2629 } 2630 if (info.v3) { 2631 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2632 } else { 2633 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2634 } 2635 2636 /* 2637 * If we were able to accomodate the last entry, 2638 * get the cookie for the next one. Otherwise 2639 * hold-over the cookie for the one we were not 2640 * able to accomodate. 2641 */ 2642 if (bigenough) { 2643 cookie.nfsuquad[0] = *tl++; 2644 if (info.v3) 2645 cookie.nfsuquad[1] = *tl++; 2646 } else if (info.v3) { 2647 tl += 2; 2648 } else { 2649 tl++; 2650 } 2651 more_dirs = fxdr_unsigned(int, *tl); 2652 } 2653 /* 2654 * If at end of rpc data, get the eof boolean 2655 */ 2656 if (!more_dirs) { 2657 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2658 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2659 } 2660 m_freem(info.mrep); 2661 info.mrep = NULL; 2662 } 2663 /* 2664 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2665 * by increasing d_reclen for the last record. 2666 */ 2667 if (blksiz > 0) { 2668 left = DIRBLKSIZ - blksiz; 2669 dp->nfs_reclen += left; 2670 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2671 uiop->uio_iov->iov_len -= left; 2672 uiop->uio_offset += left; 2673 uiop->uio_resid -= left; 2674 } 2675 2676 if (bigenough) { 2677 /* 2678 * We hit the end of the directory, update direofoffset. 2679 */ 2680 dnp->n_direofoffset = uiop->uio_offset; 2681 } else { 2682 /* 2683 * There is more to go, insert the link cookie so the 2684 * next block can be read. 2685 */ 2686 if (uiop->uio_resid > 0) 2687 kprintf("EEK! readdirrpc resid > 0\n"); 2688 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2689 *cookiep = cookie; 2690 } 2691 nfsmout: 2692 return (error); 2693 } 2694 2695 /* 2696 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2697 */ 2698 int 2699 nfs_readdirplusrpc_uio(struct vnode *vp, struct uio *uiop) 2700 { 2701 int len, left; 2702 struct nfs_dirent *dp; 2703 u_int32_t *tl; 2704 struct vnode *newvp; 2705 nfsuint64 *cookiep; 2706 caddr_t dpossav1, dpossav2; 2707 caddr_t cp; 2708 struct mbuf *mdsav1, *mdsav2; 2709 nfsuint64 cookie; 2710 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2711 struct nfsnode *dnp = VTONFS(vp), *np; 2712 nfsfh_t *fhp; 2713 u_quad_t fileno; 2714 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2715 int attrflag, fhsize; 2716 struct nchandle nch; 2717 struct nchandle dnch; 2718 struct nlcomponent nlc; 2719 struct nfsm_info info; 2720 2721 info.mrep = NULL; 2722 info.v3 = 1; 2723 2724 #ifndef nolint 2725 dp = NULL; 2726 #endif 2727 #ifndef DIAGNOSTIC 2728 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2729 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2730 panic("nfs readdirplusrpc bad uio"); 2731 #endif 2732 /* 2733 * Obtain the namecache record for the directory so we have something 2734 * to use as a basis for creating the entries. This function will 2735 * return a held (but not locked) ncp. The ncp may be disconnected 2736 * from the tree and cannot be used for upward traversals, and the 2737 * ncp may be unnamed. Note that other unrelated operations may 2738 * cause the ncp to be named at any time. 2739 * 2740 * We have to lock the ncp to prevent a lock order reversal when 2741 * rdirplus does nlookups of the children, because the vnode is 2742 * locked and has to stay that way. 2743 */ 2744 cache_fromdvp(vp, NULL, 0, &dnch); 2745 bzero(&nlc, sizeof(nlc)); 2746 newvp = NULLVP; 2747 2748 /* 2749 * If there is no cookie, assume directory was stale. 2750 */ 2751 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2752 if (cookiep) { 2753 cookie = *cookiep; 2754 } else { 2755 if (dnch.ncp) 2756 cache_drop(&dnch); 2757 return (NFSERR_BAD_COOKIE); 2758 } 2759 2760 /* 2761 * Loop around doing readdir rpc's of size nm_readdirsize 2762 * truncated to a multiple of DIRBLKSIZ. 2763 * The stopping criteria is EOF or buffer full. 2764 */ 2765 while (more_dirs && bigenough) { 2766 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2767 nfsm_reqhead(&info, vp, NFSPROC_READDIRPLUS, 2768 NFSX_FH(info.v3) + 6 * NFSX_UNSIGNED); 2769 ERROROUT(nfsm_fhtom(&info, vp)); 2770 tl = nfsm_build(&info, 6 * NFSX_UNSIGNED); 2771 *tl++ = cookie.nfsuquad[0]; 2772 *tl++ = cookie.nfsuquad[1]; 2773 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2774 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2775 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2776 *tl = txdr_unsigned(nmp->nm_rsize); 2777 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIRPLUS, 2778 uiop->uio_td, 2779 nfs_vpcred(vp, ND_READ), &error)); 2780 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2781 NFS_LATTR_NOSHRINK)); 2782 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2783 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2784 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2785 more_dirs = fxdr_unsigned(int, *tl); 2786 2787 /* loop thru the dir entries, doctoring them to 4bsd form */ 2788 while (more_dirs && bigenough) { 2789 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2790 fileno = fxdr_hyper(tl); 2791 len = fxdr_unsigned(int, *(tl + 2)); 2792 if (len <= 0 || len > NFS_MAXNAMLEN) { 2793 error = EBADRPC; 2794 m_freem(info.mrep); 2795 info.mrep = NULL; 2796 goto nfsmout; 2797 } 2798 tlen = nfsm_rndup(len); 2799 if (tlen == len) 2800 tlen += 4; /* To ensure null termination*/ 2801 left = DIRBLKSIZ - blksiz; 2802 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2803 dp->nfs_reclen += left; 2804 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2805 uiop->uio_iov->iov_len -= left; 2806 uiop->uio_offset += left; 2807 uiop->uio_resid -= left; 2808 blksiz = 0; 2809 } 2810 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2811 bigenough = 0; 2812 if (bigenough) { 2813 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2814 dp->nfs_ino = fileno; 2815 dp->nfs_namlen = len; 2816 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2817 dp->nfs_type = DT_UNKNOWN; 2818 blksiz += dp->nfs_reclen; 2819 if (blksiz == DIRBLKSIZ) 2820 blksiz = 0; 2821 uiop->uio_offset += sizeof(struct nfs_dirent); 2822 uiop->uio_resid -= sizeof(struct nfs_dirent); 2823 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2824 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2825 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2826 nlc.nlc_namelen = len; 2827 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2828 cp = uiop->uio_iov->iov_base; 2829 tlen -= len; 2830 *cp = '\0'; 2831 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2832 uiop->uio_iov->iov_len -= tlen; 2833 uiop->uio_offset += tlen; 2834 uiop->uio_resid -= tlen; 2835 } else { 2836 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2837 } 2838 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2839 if (bigenough) { 2840 cookie.nfsuquad[0] = *tl++; 2841 cookie.nfsuquad[1] = *tl++; 2842 } else { 2843 tl += 2; 2844 } 2845 2846 /* 2847 * Since the attributes are before the file handle 2848 * (sigh), we must skip over the attributes and then 2849 * come back and get them. 2850 */ 2851 attrflag = fxdr_unsigned(int, *tl); 2852 if (attrflag) { 2853 dpossav1 = info.dpos; 2854 mdsav1 = info.md; 2855 ERROROUT(nfsm_adv(&info, NFSX_V3FATTR)); 2856 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2857 doit = fxdr_unsigned(int, *tl); 2858 if (doit) { 2859 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 2860 } 2861 if (doit && bigenough && !nlcdegenerate(&nlc) && 2862 !NFS_CMPFH(dnp, fhp, fhsize) 2863 ) { 2864 if (dnch.ncp) { 2865 #if 0 2866 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2867 nlc.nlc_namelen, nlc.nlc_namelen, 2868 nlc.nlc_nameptr); 2869 #endif 2870 /* 2871 * This is a bit hokey but there isn't 2872 * much we can do about it. We can't 2873 * hold the directory vp locked while 2874 * doing lookups and gets. 2875 */ 2876 nch = cache_nlookup_nonblock(&dnch, &nlc); 2877 if (nch.ncp == NULL) 2878 goto rdfail; 2879 cache_setunresolved(&nch); 2880 error = nfs_nget_nonblock(vp->v_mount, fhp, 2881 fhsize, &np, 2882 NULL); 2883 if (error) { 2884 cache_put(&nch); 2885 goto rdfail; 2886 } 2887 newvp = NFSTOV(np); 2888 dpossav2 = info.dpos; 2889 info.dpos = dpossav1; 2890 mdsav2 = info.md; 2891 info.md = mdsav1; 2892 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 2893 info.dpos = dpossav2; 2894 info.md = mdsav2; 2895 dp->nfs_type = 2896 IFTODT(VTTOIF(np->n_vattr.va_type)); 2897 nfs_cache_setvp(&nch, newvp, 2898 nfspos_cache_timeout); 2899 vput(newvp); 2900 newvp = NULLVP; 2901 cache_put(&nch); 2902 } else { 2903 rdfail: 2904 ; 2905 #if 0 2906 kprintf("Warning: NFS/rddirplus, " 2907 "UNABLE TO ENTER %*.*s\n", 2908 nlc.nlc_namelen, nlc.nlc_namelen, 2909 nlc.nlc_nameptr); 2910 #endif 2911 } 2912 } 2913 } else { 2914 /* Just skip over the file handle */ 2915 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2916 i = fxdr_unsigned(int, *tl); 2917 ERROROUT(nfsm_adv(&info, nfsm_rndup(i))); 2918 } 2919 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2920 more_dirs = fxdr_unsigned(int, *tl); 2921 } 2922 /* 2923 * If at end of rpc data, get the eof boolean 2924 */ 2925 if (!more_dirs) { 2926 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2927 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2928 } 2929 m_freem(info.mrep); 2930 info.mrep = NULL; 2931 } 2932 /* 2933 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2934 * by increasing d_reclen for the last record. 2935 */ 2936 if (blksiz > 0) { 2937 left = DIRBLKSIZ - blksiz; 2938 dp->nfs_reclen += left; 2939 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2940 uiop->uio_iov->iov_len -= left; 2941 uiop->uio_offset += left; 2942 uiop->uio_resid -= left; 2943 } 2944 2945 /* 2946 * We are now either at the end of the directory or have filled the 2947 * block. 2948 */ 2949 if (bigenough) { 2950 dnp->n_direofoffset = uiop->uio_offset; 2951 } else { 2952 if (uiop->uio_resid > 0) 2953 kprintf("EEK! readdirplusrpc resid > 0\n"); 2954 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2955 *cookiep = cookie; 2956 } 2957 nfsmout: 2958 if (newvp != NULLVP) { 2959 if (newvp == vp) 2960 vrele(newvp); 2961 else 2962 vput(newvp); 2963 newvp = NULLVP; 2964 } 2965 if (dnch.ncp) 2966 cache_drop(&dnch); 2967 return (error); 2968 } 2969 2970 /* 2971 * Silly rename. To make the NFS filesystem that is stateless look a little 2972 * more like the "ufs" a remove of an active vnode is translated to a rename 2973 * to a funny looking filename that is removed by nfs_inactive on the 2974 * nfsnode. There is the potential for another process on a different client 2975 * to create the same funny name between the nfs_lookitup() fails and the 2976 * nfs_rename() completes, but... 2977 */ 2978 static int 2979 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2980 { 2981 struct sillyrename *sp; 2982 struct nfsnode *np; 2983 int error; 2984 2985 /* 2986 * Force finalization so the VOP_INACTIVE() call is not delayed. 2987 * This prevents cred structures from building up in nfsnodes 2988 * for deleted files. 2989 */ 2990 atomic_set_int(&vp->v_refcnt, VREF_FINALIZE); 2991 np = VTONFS(vp); 2992 np->n_flag |= NREMOVED; 2993 2994 /* 2995 * We previously purged dvp instead of vp. I don't know why, it 2996 * completely destroys performance. We can't do it anyway with the 2997 * new VFS API since we would be breaking the namecache topology. 2998 */ 2999 cache_purge(vp); /* XXX */ 3000 #ifndef DIAGNOSTIC 3001 if (vp->v_type == VDIR) 3002 panic("nfs: sillyrename dir"); 3003 #endif 3004 sp = kmalloc(sizeof(struct sillyrename), M_NFSREQ, M_WAITOK); 3005 sp->s_cred = crdup(cnp->cn_cred); 3006 sp->s_dvp = dvp; 3007 vref(dvp); 3008 3009 /* Fudge together a funny name */ 3010 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", 3011 (int)(intptr_t)cnp->cn_td); 3012 3013 /* Try lookitups until we get one that isn't there */ 3014 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3015 cnp->cn_td, NULL) == 0) { 3016 sp->s_name[4]++; 3017 if (sp->s_name[4] > 'z') { 3018 error = EINVAL; 3019 goto bad; 3020 } 3021 } 3022 error = nfs_renameit(dvp, cnp, sp); 3023 if (error) 3024 goto bad; 3025 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 3026 cnp->cn_td, &np); 3027 np->n_sillyrename = sp; 3028 return (0); 3029 bad: 3030 vrele(sp->s_dvp); 3031 crfree(sp->s_cred); 3032 kfree((caddr_t)sp, M_NFSREQ); 3033 3034 return (error); 3035 } 3036 3037 /* 3038 * Look up a file name and optionally either update the file handle or 3039 * allocate an nfsnode, depending on the value of npp. 3040 * npp == NULL --> just do the lookup 3041 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 3042 * handled too 3043 * *npp != NULL --> update the file handle in the vnode 3044 */ 3045 static int 3046 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 3047 struct thread *td, struct nfsnode **npp) 3048 { 3049 struct vnode *newvp = NULL; 3050 struct nfsnode *np, *dnp = VTONFS(dvp); 3051 int error = 0, fhlen, attrflag; 3052 nfsfh_t *nfhp; 3053 struct nfsm_info info; 3054 3055 info.mrep = NULL; 3056 info.v3 = NFS_ISV3(dvp); 3057 3058 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 3059 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 3060 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 3061 ERROROUT(nfsm_fhtom(&info, dvp)); 3062 ERROROUT(nfsm_strtom(&info, name, len, NFS_MAXNAMLEN)); 3063 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, cred, &error)); 3064 if (npp && !error) { 3065 NEGATIVEOUT(fhlen = nfsm_getfh(&info, &nfhp)); 3066 if (*npp) { 3067 np = *npp; 3068 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 3069 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 3070 np->n_fhp = &np->n_fh; 3071 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 3072 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 3073 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 3074 np->n_fhsize = fhlen; 3075 newvp = NFSTOV(np); 3076 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 3077 vref(dvp); 3078 newvp = dvp; 3079 } else { 3080 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, NULL); 3081 if (error) { 3082 m_freem(info.mrep); 3083 info.mrep = NULL; 3084 return (error); 3085 } 3086 newvp = NFSTOV(np); 3087 } 3088 if (info.v3) { 3089 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 3090 NFS_LATTR_NOSHRINK)); 3091 if (!attrflag && *npp == NULL) { 3092 m_freem(info.mrep); 3093 info.mrep = NULL; 3094 if (newvp == dvp) 3095 vrele(newvp); 3096 else 3097 vput(newvp); 3098 return (ENOENT); 3099 } 3100 } else { 3101 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 3102 } 3103 } 3104 m_freem(info.mrep); 3105 info.mrep = NULL; 3106 nfsmout: 3107 if (npp && *npp == NULL) { 3108 if (error) { 3109 if (newvp) { 3110 if (newvp == dvp) 3111 vrele(newvp); 3112 else 3113 vput(newvp); 3114 } 3115 } else 3116 *npp = np; 3117 } 3118 return (error); 3119 } 3120 3121 /* 3122 * Nfs Version 3 commit rpc 3123 * 3124 * We call it 'uio' to distinguish it from 'bio' but there is no real uio 3125 * involved. 3126 */ 3127 int 3128 nfs_commitrpc_uio(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 3129 { 3130 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3131 int error = 0, wccflag = NFSV3_WCCRATTR; 3132 struct nfsm_info info; 3133 u_int32_t *tl; 3134 3135 info.mrep = NULL; 3136 info.v3 = 1; 3137 3138 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 3139 return (0); 3140 nfsstats.rpccnt[NFSPROC_COMMIT]++; 3141 nfsm_reqhead(&info, vp, NFSPROC_COMMIT, NFSX_FH(1)); 3142 ERROROUT(nfsm_fhtom(&info, vp)); 3143 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 3144 txdr_hyper(offset, tl); 3145 tl += 2; 3146 *tl = txdr_unsigned(cnt); 3147 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_COMMIT, td, 3148 nfs_vpcred(vp, ND_WRITE), &error)); 3149 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 3150 if (!error) { 3151 NULLOUT(tl = nfsm_dissect(&info, NFSX_V3WRITEVERF)); 3152 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 3153 NFSX_V3WRITEVERF)) { 3154 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 3155 NFSX_V3WRITEVERF); 3156 error = NFSERR_STALEWRITEVERF; 3157 } 3158 } 3159 m_freem(info.mrep); 3160 info.mrep = NULL; 3161 nfsmout: 3162 return (error); 3163 } 3164 3165 /* 3166 * Kludge City.. 3167 * - make nfs_bmap() essentially a no-op that does no translation 3168 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 3169 * (Maybe I could use the process's page mapping, but I was concerned that 3170 * Kernel Write might not be enabled and also figured copyout() would do 3171 * a lot more work than bcopy() and also it currently happens in the 3172 * context of the swapper process (2). 3173 * 3174 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, 3175 * off_t *a_doffsetp, int *a_runp, int *a_runb) 3176 */ 3177 static int 3178 nfs_bmap(struct vop_bmap_args *ap) 3179 { 3180 /* no token lock required */ 3181 if (ap->a_doffsetp != NULL) 3182 *ap->a_doffsetp = ap->a_loffset; 3183 if (ap->a_runp != NULL) 3184 *ap->a_runp = 0; 3185 if (ap->a_runb != NULL) 3186 *ap->a_runb = 0; 3187 return (0); 3188 } 3189 3190 /* 3191 * Strategy routine. 3192 */ 3193 static int 3194 nfs_strategy(struct vop_strategy_args *ap) 3195 { 3196 struct bio *bio = ap->a_bio; 3197 struct bio *nbio; 3198 struct buf *bp __debugvar = bio->bio_buf; 3199 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3200 struct thread *td; 3201 int error; 3202 3203 KASSERT(bp->b_cmd != BUF_CMD_DONE, 3204 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 3205 KASSERT(BUF_LOCKINUSE(bp), 3206 ("nfs_strategy: buffer %p not locked", bp)); 3207 3208 if (bio->bio_flags & BIO_SYNC) 3209 td = curthread; /* XXX */ 3210 else 3211 td = NULL; 3212 3213 lwkt_gettoken(&nmp->nm_token); 3214 3215 /* 3216 * We probably don't need to push an nbio any more since no 3217 * block conversion is required due to the use of 64 bit byte 3218 * offsets, but do it anyway. 3219 * 3220 * NOTE: When NFS callers itself via this strategy routines and 3221 * sets up a synchronous I/O, it expects the I/O to run 3222 * synchronously (its bio_done routine just assumes it), 3223 * so for now we have to honor the bit. 3224 */ 3225 nbio = push_bio(bio); 3226 nbio->bio_offset = bio->bio_offset; 3227 nbio->bio_flags = bio->bio_flags & BIO_SYNC; 3228 3229 /* 3230 * If the op is asynchronous and an i/o daemon is waiting 3231 * queue the request, wake it up and wait for completion 3232 * otherwise just do it ourselves. 3233 */ 3234 if (bio->bio_flags & BIO_SYNC) { 3235 error = nfs_doio(ap->a_vp, nbio, td); 3236 } else { 3237 nfs_asyncio(ap->a_vp, nbio); 3238 error = 0; 3239 } 3240 lwkt_reltoken(&nmp->nm_token); 3241 3242 return (error); 3243 } 3244 3245 /* 3246 * fsync vnode op. Just call nfs_flush() with commit == 1. 3247 * 3248 * nfs_fsync(struct vnode *a_vp, int a_waitfor) 3249 */ 3250 /* ARGSUSED */ 3251 static int 3252 nfs_fsync(struct vop_fsync_args *ap) 3253 { 3254 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3255 int error; 3256 3257 lwkt_gettoken(&nmp->nm_token); 3258 3259 /* 3260 * NOTE: Because attributes are set synchronously we currently 3261 * do not have to implement vsetisdirty()/vclrisdirty(). 3262 */ 3263 error = nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1); 3264 3265 lwkt_reltoken(&nmp->nm_token); 3266 3267 return error; 3268 } 3269 3270 /* 3271 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 3272 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 3273 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 3274 * set the buffer contains data that has already been written to the server 3275 * and which now needs a commit RPC. 3276 * 3277 * If commit is 0 we only take one pass and only flush buffers containing new 3278 * dirty data. 3279 * 3280 * If commit is 1 we take two passes, issuing a commit RPC in the second 3281 * pass. 3282 * 3283 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 3284 * to completely flush all pending data. 3285 * 3286 * Note that the RB_SCAN code properly handles the case where the 3287 * callback might block and directly or indirectly (another thread) cause 3288 * the RB tree to change. 3289 */ 3290 3291 #ifndef NFS_COMMITBVECSIZ 3292 #define NFS_COMMITBVECSIZ 16 3293 #endif 3294 3295 struct nfs_flush_info { 3296 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 3297 struct thread *td; 3298 struct vnode *vp; 3299 int waitfor; 3300 int slpflag; 3301 int slptimeo; 3302 int loops; 3303 struct buf *bvary[NFS_COMMITBVECSIZ]; 3304 int bvsize; 3305 off_t beg_off; 3306 off_t end_off; 3307 }; 3308 3309 static int nfs_flush_bp(struct buf *bp, void *data); 3310 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 3311 3312 int 3313 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 3314 { 3315 struct nfsnode *np = VTONFS(vp); 3316 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3317 struct nfs_flush_info info; 3318 int error; 3319 3320 bzero(&info, sizeof(info)); 3321 info.td = td; 3322 info.vp = vp; 3323 info.waitfor = waitfor; 3324 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 3325 info.loops = 0; 3326 lwkt_gettoken(&vp->v_token); 3327 3328 do { 3329 /* 3330 * Flush mode 3331 */ 3332 info.mode = NFI_FLUSHNEW; 3333 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3334 nfs_flush_bp, &info); 3335 3336 /* 3337 * Take a second pass if committing and no error occured. 3338 * Clean up any left over collection (whether an error 3339 * occurs or not). 3340 */ 3341 if (commit && error == 0) { 3342 info.mode = NFI_COMMIT; 3343 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3344 nfs_flush_bp, &info); 3345 if (info.bvsize) 3346 error = nfs_flush_docommit(&info, error); 3347 } 3348 3349 /* 3350 * Wait for pending I/O to complete before checking whether 3351 * any further dirty buffers exist. 3352 */ 3353 while (waitfor == MNT_WAIT && 3354 bio_track_active(&vp->v_track_write)) { 3355 error = bio_track_wait(&vp->v_track_write, 3356 info.slpflag, info.slptimeo); 3357 if (error) { 3358 /* 3359 * We have to be able to break out if this 3360 * is an 'intr' mount. 3361 */ 3362 if (nfs_sigintr(nmp, NULL, td)) { 3363 error = -EINTR; 3364 break; 3365 } 3366 3367 /* 3368 * Since we do not process pending signals, 3369 * once we get a PCATCH our tsleep() will no 3370 * longer sleep, switch to a fixed timeout 3371 * instead. 3372 */ 3373 if (info.slpflag == PCATCH) { 3374 info.slpflag = 0; 3375 info.slptimeo = 2 * hz; 3376 } 3377 error = 0; 3378 } 3379 } 3380 ++info.loops; 3381 /* 3382 * Loop if we are flushing synchronous as well as committing, 3383 * and dirty buffers are still present. Otherwise we might livelock. 3384 */ 3385 } while (waitfor == MNT_WAIT && commit && 3386 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 3387 3388 /* 3389 * The callbacks have to return a negative error to terminate the 3390 * RB scan. 3391 */ 3392 if (error < 0) 3393 error = -error; 3394 3395 /* 3396 * Deal with any error collection 3397 */ 3398 if (np->n_flag & NWRITEERR) { 3399 error = np->n_error; 3400 np->n_flag &= ~NWRITEERR; 3401 } 3402 lwkt_reltoken(&vp->v_token); 3403 return (error); 3404 } 3405 3406 static 3407 int 3408 nfs_flush_bp(struct buf *bp, void *data) 3409 { 3410 struct nfs_flush_info *info = data; 3411 int lkflags; 3412 int error; 3413 off_t toff; 3414 3415 error = 0; 3416 switch(info->mode) { 3417 case NFI_FLUSHNEW: 3418 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3419 if (error && info->loops && info->waitfor == MNT_WAIT) { 3420 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3421 if (error) { 3422 lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3423 if (info->slpflag & PCATCH) 3424 lkflags |= LK_PCATCH; 3425 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3426 info->slptimeo); 3427 } 3428 } 3429 3430 /* 3431 * Ignore locking errors 3432 */ 3433 if (error) { 3434 error = 0; 3435 break; 3436 } 3437 3438 /* 3439 * The buffer may have changed out from under us, even if 3440 * we did not block (MPSAFE). Check again now that it is 3441 * locked. 3442 */ 3443 if (bp->b_vp == info->vp && 3444 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) == B_DELWRI) { 3445 bremfree(bp); 3446 bawrite(bp); 3447 } else { 3448 BUF_UNLOCK(bp); 3449 } 3450 break; 3451 case NFI_COMMIT: 3452 /* 3453 * Only process buffers in need of a commit which we can 3454 * immediately lock. This may prevent a buffer from being 3455 * committed, but the normal flush loop will block on the 3456 * same buffer so we shouldn't get into an endless loop. 3457 */ 3458 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3459 (B_DELWRI | B_NEEDCOMMIT)) { 3460 break; 3461 } 3462 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 3463 break; 3464 3465 /* 3466 * We must recheck after successfully locking the buffer. 3467 */ 3468 if (bp->b_vp != info->vp || 3469 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3470 (B_DELWRI | B_NEEDCOMMIT)) { 3471 BUF_UNLOCK(bp); 3472 break; 3473 } 3474 3475 /* 3476 * NOTE: storing the bp in the bvary[] basically sets 3477 * it up for a commit operation. 3478 * 3479 * We must call vfs_busy_pages() now so the commit operation 3480 * is interlocked with user modifications to memory mapped 3481 * pages. The b_dirtyoff/b_dirtyend range is not correct 3482 * until after the pages have been busied. 3483 * 3484 * Note: to avoid loopback deadlocks, we do not 3485 * assign b_runningbufspace. 3486 */ 3487 bremfree(bp); 3488 bp->b_cmd = BUF_CMD_WRITE; 3489 vfs_busy_pages(bp->b_vp, bp); 3490 info->bvary[info->bvsize] = bp; 3491 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3492 if (info->bvsize == 0 || toff < info->beg_off) 3493 info->beg_off = toff; 3494 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3495 if (info->bvsize == 0 || toff > info->end_off) 3496 info->end_off = toff; 3497 ++info->bvsize; 3498 if (info->bvsize == NFS_COMMITBVECSIZ) { 3499 error = nfs_flush_docommit(info, 0); 3500 KKASSERT(info->bvsize == 0); 3501 } 3502 } 3503 return (error); 3504 } 3505 3506 static 3507 int 3508 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3509 { 3510 struct vnode *vp; 3511 struct buf *bp; 3512 off_t bytes; 3513 int retv; 3514 int i; 3515 3516 vp = info->vp; 3517 3518 if (info->bvsize > 0) { 3519 /* 3520 * Commit data on the server, as required. Note that 3521 * nfs_commit will use the vnode's cred for the commit. 3522 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3523 */ 3524 bytes = info->end_off - info->beg_off; 3525 if (bytes > 0x40000000) 3526 bytes = 0x40000000; 3527 if (error) { 3528 retv = -error; 3529 } else { 3530 retv = nfs_commitrpc_uio(vp, info->beg_off, 3531 (int)bytes, info->td); 3532 if (retv == NFSERR_STALEWRITEVERF) 3533 nfs_clearcommit(vp->v_mount); 3534 } 3535 3536 /* 3537 * Now, either mark the blocks I/O done or mark the 3538 * blocks dirty, depending on whether the commit 3539 * succeeded. 3540 */ 3541 for (i = 0; i < info->bvsize; ++i) { 3542 bp = info->bvary[i]; 3543 if (retv || (bp->b_flags & B_NEEDCOMMIT) == 0) { 3544 /* 3545 * Either an error or the original 3546 * vfs_busy_pages() cleared B_NEEDCOMMIT 3547 * due to finding new dirty VM pages in 3548 * the buffer. 3549 * 3550 * Leave B_DELWRI intact. 3551 */ 3552 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3553 vfs_unbusy_pages(bp); 3554 bp->b_cmd = BUF_CMD_DONE; 3555 bqrelse(bp); 3556 } else { 3557 /* 3558 * Success, remove B_DELWRI ( bundirty() ). 3559 * 3560 * b_dirtyoff/b_dirtyend seem to be NFS 3561 * specific. We should probably move that 3562 * into bundirty(). XXX 3563 * 3564 * We are faking an I/O write, we have to 3565 * start the transaction in order to 3566 * immediately biodone() it. 3567 */ 3568 bundirty(bp); 3569 bp->b_flags &= ~B_ERROR; 3570 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3571 bp->b_dirtyoff = bp->b_dirtyend = 0; 3572 biodone(&bp->b_bio1); 3573 } 3574 } 3575 info->bvsize = 0; 3576 } 3577 return (error); 3578 } 3579 3580 /* 3581 * NFS advisory byte-level locks. 3582 * Currently unsupported. 3583 * 3584 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3585 * int a_flags) 3586 */ 3587 static int 3588 nfs_advlock(struct vop_advlock_args *ap) 3589 { 3590 struct nfsnode *np = VTONFS(ap->a_vp); 3591 3592 /* no token lock currently required */ 3593 /* 3594 * The following kludge is to allow diskless support to work 3595 * until a real NFS lockd is implemented. Basically, just pretend 3596 * that this is a local lock. 3597 */ 3598 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3599 } 3600 3601 /* 3602 * Print out the contents of an nfsnode. 3603 * 3604 * nfs_print(struct vnode *a_vp) 3605 */ 3606 static int 3607 nfs_print(struct vop_print_args *ap) 3608 { 3609 struct vnode *vp = ap->a_vp; 3610 struct nfsnode *np = VTONFS(vp); 3611 3612 kprintf("tag VT_NFS, fileid %lld fsid 0x%x", 3613 (long long)np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3614 if (vp->v_type == VFIFO) 3615 fifo_printinfo(vp); 3616 kprintf("\n"); 3617 return (0); 3618 } 3619 3620 /* 3621 * nfs special file access vnode op. 3622 * 3623 * nfs_laccess(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 3624 */ 3625 static int 3626 nfs_laccess(struct vop_access_args *ap) 3627 { 3628 struct nfsmount *nmp = VFSTONFS(ap->a_vp->v_mount); 3629 struct vattr vattr; 3630 int error; 3631 3632 lwkt_gettoken(&nmp->nm_token); 3633 error = VOP_GETATTR(ap->a_vp, &vattr); 3634 if (error == 0) { 3635 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid, 3636 vattr.va_mode, 0); 3637 } 3638 lwkt_reltoken(&nmp->nm_token); 3639 3640 return (error); 3641 } 3642 3643 /* 3644 * Read wrapper for fifos. 3645 * 3646 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3647 * struct ucred *a_cred) 3648 */ 3649 static int 3650 nfsfifo_read(struct vop_read_args *ap) 3651 { 3652 struct nfsnode *np = VTONFS(ap->a_vp); 3653 3654 /* no token access required */ 3655 /* 3656 * Set access flag. 3657 */ 3658 np->n_flag |= NACC; 3659 getnanotime(&np->n_atim); 3660 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3661 } 3662 3663 /* 3664 * Write wrapper for fifos. 3665 * 3666 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3667 * struct ucred *a_cred) 3668 */ 3669 static int 3670 nfsfifo_write(struct vop_write_args *ap) 3671 { 3672 struct nfsnode *np = VTONFS(ap->a_vp); 3673 3674 /* no token access required */ 3675 /* 3676 * Set update flag. 3677 */ 3678 np->n_flag |= NUPD; 3679 getnanotime(&np->n_mtim); 3680 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3681 } 3682 3683 /* 3684 * Close wrapper for fifos. 3685 * 3686 * Update the times on the nfsnode then do fifo close. 3687 * 3688 * nfsfifo_close(struct vnode *a_vp, int a_fflag) 3689 */ 3690 static int 3691 nfsfifo_close(struct vop_close_args *ap) 3692 { 3693 struct vnode *vp = ap->a_vp; 3694 struct nfsnode *np = VTONFS(vp); 3695 struct vattr vattr; 3696 struct timespec ts; 3697 3698 /* no token access required */ 3699 3700 vn_lock(vp, LK_UPGRADE | LK_RETRY); /* XXX */ 3701 if (np->n_flag & (NACC | NUPD)) { 3702 getnanotime(&ts); 3703 if (np->n_flag & NACC) 3704 np->n_atim = ts; 3705 if (np->n_flag & NUPD) 3706 np->n_mtim = ts; 3707 np->n_flag |= NCHG; 3708 if (VREFCNT(vp) == 1 && 3709 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3710 VATTR_NULL(&vattr); 3711 if (np->n_flag & NACC) 3712 vattr.va_atime = np->n_atim; 3713 if (np->n_flag & NUPD) 3714 vattr.va_mtime = np->n_mtim; 3715 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3716 } 3717 } 3718 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3719 } 3720 3721 /************************************************************************ 3722 * KQFILTER OPS * 3723 ************************************************************************/ 3724 3725 static void filt_nfsdetach(struct knote *kn); 3726 static int filt_nfsread(struct knote *kn, long hint); 3727 static int filt_nfswrite(struct knote *kn, long hint); 3728 static int filt_nfsvnode(struct knote *kn, long hint); 3729 3730 static struct filterops nfsread_filtops = 3731 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3732 NULL, filt_nfsdetach, filt_nfsread }; 3733 static struct filterops nfswrite_filtops = 3734 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3735 NULL, filt_nfsdetach, filt_nfswrite }; 3736 static struct filterops nfsvnode_filtops = 3737 { FILTEROP_ISFD | FILTEROP_MPSAFE, 3738 NULL, filt_nfsdetach, filt_nfsvnode }; 3739 3740 static int 3741 nfs_kqfilter (struct vop_kqfilter_args *ap) 3742 { 3743 struct vnode *vp = ap->a_vp; 3744 struct knote *kn = ap->a_kn; 3745 3746 switch (kn->kn_filter) { 3747 case EVFILT_READ: 3748 kn->kn_fop = &nfsread_filtops; 3749 break; 3750 case EVFILT_WRITE: 3751 kn->kn_fop = &nfswrite_filtops; 3752 break; 3753 case EVFILT_VNODE: 3754 kn->kn_fop = &nfsvnode_filtops; 3755 break; 3756 default: 3757 return (EOPNOTSUPP); 3758 } 3759 3760 kn->kn_hook = (caddr_t)vp; 3761 3762 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3763 3764 return(0); 3765 } 3766 3767 static void 3768 filt_nfsdetach(struct knote *kn) 3769 { 3770 struct vnode *vp = (void *)kn->kn_hook; 3771 3772 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn); 3773 } 3774 3775 static int 3776 filt_nfsread(struct knote *kn, long hint) 3777 { 3778 struct vnode *vp = (void *)kn->kn_hook; 3779 struct nfsnode *node = VTONFS(vp); 3780 off_t off; 3781 3782 if (hint == NOTE_REVOKE) { 3783 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3784 return(1); 3785 } 3786 3787 /* 3788 * Interlock against MP races when performing this function. XXX 3789 */ 3790 /* TMPFS_NODE_LOCK_SH(node); */ 3791 off = node->n_size - kn->kn_fp->f_offset; 3792 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3793 if (kn->kn_sfflags & NOTE_OLDAPI) { 3794 /* TMPFS_NODE_UNLOCK(node); */ 3795 return(1); 3796 } 3797 if (kn->kn_data == 0) { 3798 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX; 3799 } 3800 /* TMPFS_NODE_UNLOCK(node); */ 3801 return (kn->kn_data != 0); 3802 } 3803 3804 static int 3805 filt_nfswrite(struct knote *kn, long hint) 3806 { 3807 if (hint == NOTE_REVOKE) 3808 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT); 3809 kn->kn_data = 0; 3810 return (1); 3811 } 3812 3813 static int 3814 filt_nfsvnode(struct knote *kn, long hint) 3815 { 3816 if (kn->kn_sfflags & hint) 3817 kn->kn_fflags |= hint; 3818 if (hint == NOTE_REVOKE) { 3819 kn->kn_flags |= (EV_EOF | EV_NODATA); 3820 return (1); 3821 } 3822 return (kn->kn_fflags != 0); 3823 } 3824