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