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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 37 * $FreeBSD: src/sys/nfs/nfs_vnops.c,v 1.150.2.5 2001/12/20 19:56:28 dillon Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_vnops.c,v 1.80 2008/10/18 01:13:54 dillon Exp $ 39 */ 40 41 42 /* 43 * vnode op calls for Sun NFS version 2 and 3 44 */ 45 46 #include "opt_inet.h" 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/resourcevar.h> 52 #include <sys/proc.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/nlookup.h> 59 #include <sys/socket.h> 60 #include <sys/vnode.h> 61 #include <sys/dirent.h> 62 #include <sys/fcntl.h> 63 #include <sys/lockf.h> 64 #include <sys/stat.h> 65 #include <sys/sysctl.h> 66 #include <sys/conf.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_zone.h> 71 72 #include <sys/buf2.h> 73 74 #include <vfs/fifofs/fifo.h> 75 #include <vfs/ufs/dir.h> 76 77 #undef DIRBLKSIZ 78 79 #include "rpcv2.h" 80 #include "nfsproto.h" 81 #include "nfs.h" 82 #include "nfsmount.h" 83 #include "nfsnode.h" 84 #include "xdr_subs.h" 85 #include "nfsm_subs.h" 86 87 #include <net/if.h> 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 91 #include <sys/thread2.h> 92 93 /* Defs */ 94 #define TRUE 1 95 #define FALSE 0 96 97 static int nfsfifo_read (struct vop_read_args *); 98 static int nfsfifo_write (struct vop_write_args *); 99 static int nfsfifo_close (struct vop_close_args *); 100 #define nfs_poll vop_nopoll 101 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 102 static int nfs_lookup (struct vop_old_lookup_args *); 103 static int nfs_create (struct vop_old_create_args *); 104 static int nfs_mknod (struct vop_old_mknod_args *); 105 static int nfs_open (struct vop_open_args *); 106 static int nfs_close (struct vop_close_args *); 107 static int nfs_access (struct vop_access_args *); 108 static int nfs_getattr (struct vop_getattr_args *); 109 static int nfs_setattr (struct vop_setattr_args *); 110 static int nfs_read (struct vop_read_args *); 111 static int nfs_mmap (struct vop_mmap_args *); 112 static int nfs_fsync (struct vop_fsync_args *); 113 static int nfs_remove (struct vop_old_remove_args *); 114 static int nfs_link (struct vop_old_link_args *); 115 static int nfs_rename (struct vop_old_rename_args *); 116 static int nfs_mkdir (struct vop_old_mkdir_args *); 117 static int nfs_rmdir (struct vop_old_rmdir_args *); 118 static int nfs_symlink (struct vop_old_symlink_args *); 119 static int nfs_readdir (struct vop_readdir_args *); 120 static int nfs_bmap (struct vop_bmap_args *); 121 static int nfs_strategy (struct vop_strategy_args *); 122 static int nfs_lookitup (struct vnode *, const char *, int, 123 struct ucred *, struct thread *, struct nfsnode **); 124 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 125 static int nfs_laccess (struct vop_access_args *); 126 static int nfs_readlink (struct vop_readlink_args *); 127 static int nfs_print (struct vop_print_args *); 128 static int nfs_advlock (struct vop_advlock_args *); 129 130 static int nfs_nresolve (struct vop_nresolve_args *); 131 /* 132 * Global vfs data structures for nfs 133 */ 134 struct vop_ops nfsv2_vnode_vops = { 135 .vop_default = vop_defaultop, 136 .vop_access = nfs_access, 137 .vop_advlock = nfs_advlock, 138 .vop_bmap = nfs_bmap, 139 .vop_close = nfs_close, 140 .vop_old_create = nfs_create, 141 .vop_fsync = nfs_fsync, 142 .vop_getattr = nfs_getattr, 143 .vop_getpages = nfs_getpages, 144 .vop_putpages = nfs_putpages, 145 .vop_inactive = nfs_inactive, 146 .vop_old_link = nfs_link, 147 .vop_old_lookup = nfs_lookup, 148 .vop_old_mkdir = nfs_mkdir, 149 .vop_old_mknod = nfs_mknod, 150 .vop_mmap = nfs_mmap, 151 .vop_open = nfs_open, 152 .vop_poll = nfs_poll, 153 .vop_print = nfs_print, 154 .vop_read = nfs_read, 155 .vop_readdir = nfs_readdir, 156 .vop_readlink = nfs_readlink, 157 .vop_reclaim = nfs_reclaim, 158 .vop_old_remove = nfs_remove, 159 .vop_old_rename = nfs_rename, 160 .vop_old_rmdir = nfs_rmdir, 161 .vop_setattr = nfs_setattr, 162 .vop_strategy = nfs_strategy, 163 .vop_old_symlink = nfs_symlink, 164 .vop_write = nfs_write, 165 .vop_nresolve = nfs_nresolve 166 }; 167 168 /* 169 * Special device vnode ops 170 */ 171 struct vop_ops nfsv2_spec_vops = { 172 .vop_default = vop_defaultop, 173 .vop_access = nfs_laccess, 174 .vop_close = nfs_close, 175 .vop_fsync = nfs_fsync, 176 .vop_getattr = nfs_getattr, 177 .vop_inactive = nfs_inactive, 178 .vop_print = nfs_print, 179 .vop_read = vop_stdnoread, 180 .vop_reclaim = nfs_reclaim, 181 .vop_setattr = nfs_setattr, 182 .vop_write = vop_stdnowrite 183 }; 184 185 struct vop_ops nfsv2_fifo_vops = { 186 .vop_default = fifo_vnoperate, 187 .vop_access = nfs_laccess, 188 .vop_close = nfsfifo_close, 189 .vop_fsync = nfs_fsync, 190 .vop_getattr = nfs_getattr, 191 .vop_inactive = nfs_inactive, 192 .vop_print = nfs_print, 193 .vop_read = nfsfifo_read, 194 .vop_reclaim = nfs_reclaim, 195 .vop_setattr = nfs_setattr, 196 .vop_write = nfsfifo_write 197 }; 198 199 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 200 struct componentname *cnp, 201 struct vattr *vap); 202 static int nfs_removerpc (struct vnode *dvp, const char *name, 203 int namelen, 204 struct ucred *cred, struct thread *td); 205 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 206 int fnamelen, struct vnode *tdvp, 207 const char *tnameptr, int tnamelen, 208 struct ucred *cred, struct thread *td); 209 static int nfs_renameit (struct vnode *sdvp, 210 struct componentname *scnp, 211 struct sillyrename *sp); 212 213 SYSCTL_DECL(_vfs_nfs); 214 215 static int nfs_flush_on_rename = 1; 216 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_rename, CTLFLAG_RW, 217 &nfs_flush_on_rename, 0, "flush fvp prior to rename"); 218 static int nfs_flush_on_hlink = 0; 219 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_hlink, CTLFLAG_RW, 220 &nfs_flush_on_hlink, 0, "flush fvp prior to hard link"); 221 222 static int nfsaccess_cache_timeout = NFS_DEFATTRTIMO; 223 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 224 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 225 226 static int nfsneg_cache_timeout = NFS_MINATTRTIMO; 227 SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, 228 &nfsneg_cache_timeout, 0, "NFS NEGATIVE NAMECACHE timeout"); 229 230 static int nfspos_cache_timeout = NFS_MINATTRTIMO; 231 SYSCTL_INT(_vfs_nfs, OID_AUTO, pos_cache_timeout, CTLFLAG_RW, 232 &nfspos_cache_timeout, 0, "NFS POSITIVE NAMECACHE timeout"); 233 234 static int nfsv3_commit_on_close = 0; 235 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 236 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 237 #if 0 238 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 239 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 240 241 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 242 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 243 #endif 244 245 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 246 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 247 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 248 static int 249 nfs3_access_otw(struct vnode *vp, int wmode, 250 struct thread *td, struct ucred *cred) 251 { 252 struct nfsnode *np = VTONFS(vp); 253 int attrflag; 254 int error = 0; 255 u_int32_t *tl; 256 u_int32_t rmode; 257 struct nfsm_info info; 258 259 info.mrep = NULL; 260 info.v3 = 1; 261 262 nfsstats.rpccnt[NFSPROC_ACCESS]++; 263 nfsm_reqhead(&info, vp, NFSPROC_ACCESS, 264 NFSX_FH(info.v3) + NFSX_UNSIGNED); 265 ERROROUT(nfsm_fhtom(&info, vp)); 266 tl = nfsm_build(&info, NFSX_UNSIGNED); 267 *tl = txdr_unsigned(wmode); 268 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_ACCESS, td, cred, &error)); 269 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, NFS_LATTR_NOSHRINK)); 270 if (error == 0) { 271 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 272 rmode = fxdr_unsigned(u_int32_t, *tl); 273 np->n_mode = rmode; 274 np->n_modeuid = cred->cr_uid; 275 np->n_modestamp = mycpu->gd_time_seconds; 276 } 277 m_freem(info.mrep); 278 info.mrep = NULL; 279 nfsmout: 280 return error; 281 } 282 283 /* 284 * nfs access vnode op. 285 * For nfs version 2, just return ok. File accesses may fail later. 286 * For nfs version 3, use the access rpc to check accessibility. If file modes 287 * are changed on the server, accesses might still fail later. 288 * 289 * nfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 290 */ 291 static int 292 nfs_access(struct vop_access_args *ap) 293 { 294 struct ucred *cred; 295 struct vnode *vp = ap->a_vp; 296 thread_t td = curthread; 297 int error = 0; 298 u_int32_t mode, wmode; 299 struct nfsnode *np = VTONFS(vp); 300 int v3 = NFS_ISV3(vp); 301 302 /* 303 * Disallow write attempts on filesystems mounted read-only; 304 * unless the file is a socket, fifo, or a block or character 305 * device resident on the filesystem. 306 */ 307 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 308 switch (vp->v_type) { 309 case VREG: 310 case VDIR: 311 case VLNK: 312 return (EROFS); 313 default: 314 break; 315 } 316 } 317 318 /* 319 * The NFS protocol passes only the effective uid/gid over the wire but 320 * we need to check access against real ids if AT_EACCESS not set. 321 * Handle this case by cloning the credentials and setting the 322 * effective ids to the real ones. 323 */ 324 if (ap->a_flags & AT_EACCESS) { 325 cred = crhold(ap->a_cred); 326 } else { 327 cred = crdup(ap->a_cred); 328 cred->cr_uid = cred->cr_ruid; 329 cred->cr_gid = cred->cr_rgid; 330 } 331 332 /* 333 * For nfs v3, check to see if we have done this recently, and if 334 * so return our cached result instead of making an ACCESS call. 335 * If not, do an access rpc, otherwise you are stuck emulating 336 * ufs_access() locally using the vattr. This may not be correct, 337 * since the server may apply other access criteria such as 338 * client uid-->server uid mapping that we do not know about. 339 */ 340 if (v3) { 341 if (ap->a_mode & VREAD) 342 mode = NFSV3ACCESS_READ; 343 else 344 mode = 0; 345 if (vp->v_type != VDIR) { 346 if (ap->a_mode & VWRITE) 347 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 348 if (ap->a_mode & VEXEC) 349 mode |= NFSV3ACCESS_EXECUTE; 350 } else { 351 if (ap->a_mode & VWRITE) 352 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 353 NFSV3ACCESS_DELETE); 354 if (ap->a_mode & VEXEC) 355 mode |= NFSV3ACCESS_LOOKUP; 356 } 357 /* XXX safety belt, only make blanket request if caching */ 358 if (nfsaccess_cache_timeout > 0) { 359 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 360 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 361 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 362 } else { 363 wmode = mode; 364 } 365 366 /* 367 * Does our cached result allow us to give a definite yes to 368 * this request? 369 */ 370 if (np->n_modestamp && 371 (mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && 372 (cred->cr_uid == np->n_modeuid) && 373 ((np->n_mode & mode) == mode)) { 374 nfsstats.accesscache_hits++; 375 } else { 376 /* 377 * Either a no, or a don't know. Go to the wire. 378 */ 379 nfsstats.accesscache_misses++; 380 error = nfs3_access_otw(vp, wmode, td, cred); 381 if (!error) { 382 if ((np->n_mode & mode) != mode) { 383 error = EACCES; 384 } 385 } 386 } 387 } else { 388 if ((error = nfs_laccess(ap)) != 0) { 389 crfree(cred); 390 return (error); 391 } 392 393 /* 394 * Attempt to prevent a mapped root from accessing a file 395 * which it shouldn't. We try to read a byte from the file 396 * if the user is root and the file is not zero length. 397 * After calling nfs_laccess, we should have the correct 398 * file size cached. 399 */ 400 if (cred->cr_uid == 0 && (ap->a_mode & VREAD) 401 && VTONFS(vp)->n_size > 0) { 402 struct iovec aiov; 403 struct uio auio; 404 char buf[1]; 405 406 aiov.iov_base = buf; 407 aiov.iov_len = 1; 408 auio.uio_iov = &aiov; 409 auio.uio_iovcnt = 1; 410 auio.uio_offset = 0; 411 auio.uio_resid = 1; 412 auio.uio_segflg = UIO_SYSSPACE; 413 auio.uio_rw = UIO_READ; 414 auio.uio_td = td; 415 416 if (vp->v_type == VREG) { 417 error = nfs_readrpc_uio(vp, &auio); 418 } else if (vp->v_type == VDIR) { 419 char* bp; 420 bp = kmalloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 421 aiov.iov_base = bp; 422 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 423 error = nfs_readdirrpc_uio(vp, &auio); 424 kfree(bp, M_TEMP); 425 } else if (vp->v_type == VLNK) { 426 error = nfs_readlinkrpc_uio(vp, &auio); 427 } else { 428 error = EACCES; 429 } 430 } 431 } 432 /* 433 * [re]record creds for reading and/or writing if access 434 * was granted. Assume the NFS server will grant read access 435 * for execute requests. 436 */ 437 if (error == 0) { 438 if ((ap->a_mode & (VREAD|VEXEC)) && cred != np->n_rucred) { 439 crhold(cred); 440 if (np->n_rucred) 441 crfree(np->n_rucred); 442 np->n_rucred = cred; 443 } 444 if ((ap->a_mode & VWRITE) && cred != np->n_wucred) { 445 crhold(cred); 446 if (np->n_wucred) 447 crfree(np->n_wucred); 448 np->n_wucred = cred; 449 } 450 } 451 crfree(cred); 452 return(error); 453 } 454 455 /* 456 * nfs open vnode op 457 * Check to see if the type is ok 458 * and that deletion is not in progress. 459 * For paged in text files, you will need to flush the page cache 460 * if consistency is lost. 461 * 462 * nfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 463 * struct file *a_fp) 464 */ 465 /* ARGSUSED */ 466 static int 467 nfs_open(struct vop_open_args *ap) 468 { 469 struct vnode *vp = ap->a_vp; 470 struct nfsnode *np = VTONFS(vp); 471 struct vattr vattr; 472 int error; 473 474 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 475 #ifdef DIAGNOSTIC 476 kprintf("open eacces vtyp=%d\n",vp->v_type); 477 #endif 478 return (EOPNOTSUPP); 479 } 480 481 /* 482 * Save valid creds for reading and writing for later RPCs. 483 */ 484 if ((ap->a_mode & FREAD) && ap->a_cred != np->n_rucred) { 485 crhold(ap->a_cred); 486 if (np->n_rucred) 487 crfree(np->n_rucred); 488 np->n_rucred = ap->a_cred; 489 } 490 if ((ap->a_mode & FWRITE) && ap->a_cred != np->n_wucred) { 491 crhold(ap->a_cred); 492 if (np->n_wucred) 493 crfree(np->n_wucred); 494 np->n_wucred = ap->a_cred; 495 } 496 497 /* 498 * Clear the attribute cache only if opening with write access. It 499 * is unclear if we should do this at all here, but we certainly 500 * should not clear the cache unconditionally simply because a file 501 * is being opened. 502 */ 503 if (ap->a_mode & FWRITE) 504 np->n_attrstamp = 0; 505 506 /* 507 * For normal NFS, reconcile changes made locally verses 508 * changes made remotely. Note that VOP_GETATTR only goes 509 * to the wire if the cached attribute has timed out or been 510 * cleared. 511 * 512 * If local modifications have been made clear the attribute 513 * cache to force an attribute and modified time check. If 514 * GETATTR detects that the file has been changed by someone 515 * other then us it will set NRMODIFIED. 516 * 517 * If we are opening a directory and local changes have been 518 * made we have to invalidate the cache in order to ensure 519 * that we get the most up-to-date information from the 520 * server. XXX 521 */ 522 if (np->n_flag & NLMODIFIED) { 523 np->n_attrstamp = 0; 524 if (vp->v_type == VDIR) { 525 error = nfs_vinvalbuf(vp, V_SAVE, 1); 526 if (error == EINTR) 527 return (error); 528 nfs_invaldir(vp); 529 } 530 } 531 error = VOP_GETATTR(vp, &vattr); 532 if (error) 533 return (error); 534 if (np->n_flag & NRMODIFIED) { 535 if (vp->v_type == VDIR) 536 nfs_invaldir(vp); 537 error = nfs_vinvalbuf(vp, V_SAVE, 1); 538 if (error == EINTR) 539 return (error); 540 np->n_flag &= ~NRMODIFIED; 541 } 542 543 return (vop_stdopen(ap)); 544 } 545 546 /* 547 * nfs close vnode op 548 * What an NFS client should do upon close after writing is a debatable issue. 549 * Most NFS clients push delayed writes to the server upon close, basically for 550 * two reasons: 551 * 1 - So that any write errors may be reported back to the client process 552 * doing the close system call. By far the two most likely errors are 553 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 554 * 2 - To put a worst case upper bound on cache inconsistency between 555 * multiple clients for the file. 556 * There is also a consistency problem for Version 2 of the protocol w.r.t. 557 * not being able to tell if other clients are writing a file concurrently, 558 * since there is no way of knowing if the changed modify time in the reply 559 * is only due to the write for this client. 560 * (NFS Version 3 provides weak cache consistency data in the reply that 561 * should be sufficient to detect and handle this case.) 562 * 563 * The current code does the following: 564 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 565 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 566 * or commit them (this satisfies 1 and 2 except for the 567 * case where the server crashes after this close but 568 * before the commit RPC, which is felt to be "good 569 * enough". Changing the last argument to nfs_flush() to 570 * a 1 would force a commit operation, if it is felt a 571 * commit is necessary now. 572 * for NQNFS - do nothing now, since 2 is dealt with via leases and 573 * 1 should be dealt with via an fsync() system call for 574 * cases where write errors are important. 575 * 576 * nfs_close(struct vnode *a_vp, int a_fflag) 577 */ 578 /* ARGSUSED */ 579 static int 580 nfs_close(struct vop_close_args *ap) 581 { 582 struct vnode *vp = ap->a_vp; 583 struct nfsnode *np = VTONFS(vp); 584 int error = 0; 585 thread_t td = curthread; 586 587 if (vp->v_type == VREG) { 588 if (np->n_flag & NLMODIFIED) { 589 if (NFS_ISV3(vp)) { 590 /* 591 * Under NFSv3 we have dirty buffers to dispose of. We 592 * must flush them to the NFS server. We have the option 593 * of waiting all the way through the commit rpc or just 594 * waiting for the initial write. The default is to only 595 * wait through the initial write so the data is in the 596 * server's cache, which is roughly similar to the state 597 * a standard disk subsystem leaves the file in on close(). 598 * 599 * We cannot clear the NLMODIFIED bit in np->n_flag due to 600 * potential races with other processes, and certainly 601 * cannot clear it if we don't commit. 602 */ 603 int cm = nfsv3_commit_on_close ? 1 : 0; 604 error = nfs_flush(vp, MNT_WAIT, td, cm); 605 /* np->n_flag &= ~NLMODIFIED; */ 606 } else { 607 error = nfs_vinvalbuf(vp, V_SAVE, 1); 608 } 609 np->n_attrstamp = 0; 610 } 611 if (np->n_flag & NWRITEERR) { 612 np->n_flag &= ~NWRITEERR; 613 error = np->n_error; 614 } 615 } 616 vop_stdclose(ap); 617 return (error); 618 } 619 620 /* 621 * nfs getattr call from vfs. 622 * 623 * nfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 624 */ 625 static int 626 nfs_getattr(struct vop_getattr_args *ap) 627 { 628 struct vnode *vp = ap->a_vp; 629 struct nfsnode *np = VTONFS(vp); 630 int error = 0; 631 thread_t td = curthread; 632 struct nfsm_info info; 633 634 info.mrep = NULL; 635 info.v3 = NFS_ISV3(vp); 636 637 /* 638 * Update local times for special files. 639 */ 640 if (np->n_flag & (NACC | NUPD)) 641 np->n_flag |= NCHG; 642 /* 643 * First look in the cache. 644 */ 645 if (nfs_getattrcache(vp, ap->a_vap) == 0) 646 return (0); 647 648 if (info.v3 && nfsaccess_cache_timeout > 0) { 649 nfsstats.accesscache_misses++; 650 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, nfs_vpcred(vp, ND_CHECK)); 651 if (nfs_getattrcache(vp, ap->a_vap) == 0) 652 return (0); 653 } 654 655 nfsstats.rpccnt[NFSPROC_GETATTR]++; 656 nfsm_reqhead(&info, vp, NFSPROC_GETATTR, NFSX_FH(info.v3)); 657 ERROROUT(nfsm_fhtom(&info, vp)); 658 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_GETATTR, td, 659 nfs_vpcred(vp, ND_CHECK), &error)); 660 if (error == 0) { 661 ERROROUT(nfsm_loadattr(&info, vp, ap->a_vap)); 662 } 663 m_freem(info.mrep); 664 info.mrep = NULL; 665 nfsmout: 666 return (error); 667 } 668 669 /* 670 * nfs setattr call. 671 * 672 * nfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred) 673 */ 674 static int 675 nfs_setattr(struct vop_setattr_args *ap) 676 { 677 struct vnode *vp = ap->a_vp; 678 struct nfsnode *np = VTONFS(vp); 679 struct vattr *vap = ap->a_vap; 680 struct buf *bp; 681 int biosize = vp->v_mount->mnt_stat.f_iosize; 682 int error = 0; 683 int boff; 684 off_t tsize; 685 thread_t td = curthread; 686 687 #ifndef nolint 688 tsize = (off_t)0; 689 #endif 690 691 /* 692 * Setting of flags is not supported. 693 */ 694 if (vap->va_flags != VNOVAL) 695 return (EOPNOTSUPP); 696 697 /* 698 * Disallow write attempts if the filesystem is mounted read-only. 699 */ 700 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 701 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 702 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 703 (vp->v_mount->mnt_flag & MNT_RDONLY)) 704 return (EROFS); 705 706 if (vap->va_size != VNOVAL) { 707 /* 708 * truncation requested 709 */ 710 switch (vp->v_type) { 711 case VDIR: 712 return (EISDIR); 713 case VCHR: 714 case VBLK: 715 case VSOCK: 716 case VFIFO: 717 if (vap->va_mtime.tv_sec == VNOVAL && 718 vap->va_atime.tv_sec == VNOVAL && 719 vap->va_mode == (mode_t)VNOVAL && 720 vap->va_uid == (uid_t)VNOVAL && 721 vap->va_gid == (gid_t)VNOVAL) 722 return (0); 723 vap->va_size = VNOVAL; 724 break; 725 default: 726 /* 727 * Disallow write attempts if the filesystem is 728 * mounted read-only. 729 */ 730 if (vp->v_mount->mnt_flag & MNT_RDONLY) 731 return (EROFS); 732 733 /* 734 * This is nasty. The RPCs we send to flush pending 735 * data often return attribute information which is 736 * cached via a callback to nfs_loadattrcache(), which 737 * has the effect of changing our notion of the file 738 * size. Due to flushed appends and other operations 739 * the file size can be set to virtually anything, 740 * including values that do not match either the old 741 * or intended file size. 742 * 743 * When this condition is detected we must loop to 744 * try the operation again. Hopefully no more 745 * flushing is required on the loop so it works the 746 * second time around. THIS CASE ALMOST ALWAYS 747 * HAPPENS! 748 */ 749 tsize = np->n_size; 750 again: 751 boff = (int)vap->va_size & (biosize - 1); 752 bp = nfs_meta_setsize(vp, td, vap->va_size - boff, 753 boff, 0); 754 if (bp) { 755 error = 0; 756 brelse(bp); 757 } else { 758 error = EINTR; 759 } 760 761 if (np->n_flag & NLMODIFIED) { 762 if (vap->va_size == 0) 763 error = nfs_vinvalbuf(vp, 0, 1); 764 else 765 error = nfs_vinvalbuf(vp, V_SAVE, 1); 766 } 767 /* 768 * note: this loop case almost always happens at 769 * least once per truncation. 770 */ 771 if (error == 0 && np->n_size != vap->va_size) 772 goto again; 773 np->n_vattr.va_size = vap->va_size; 774 break; 775 } 776 } else if ((np->n_flag & NLMODIFIED) && vp->v_type == VREG) { 777 /* 778 * What to do. If we are modifying the mtime we lose 779 * mtime detection of changes made by the server or other 780 * clients. But programs like rsync/rdist/cpdup are going 781 * to call utimes a lot. We don't want to piecemeal sync. 782 * 783 * For now sync if any prior remote changes were detected, 784 * but allow us to lose track of remote changes made during 785 * the utimes operation. 786 */ 787 if (np->n_flag & NRMODIFIED) 788 error = nfs_vinvalbuf(vp, V_SAVE, 1); 789 if (error == EINTR) 790 return (error); 791 if (error == 0) { 792 if (vap->va_mtime.tv_sec != VNOVAL) { 793 np->n_mtime = vap->va_mtime.tv_sec; 794 } 795 } 796 } 797 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 798 799 /* 800 * Sanity check if a truncation was issued. This should only occur 801 * if multiple processes are racing on the same file. 802 */ 803 if (error == 0 && vap->va_size != VNOVAL && 804 np->n_size != vap->va_size) { 805 kprintf("NFS ftruncate: server disagrees on the file size: " 806 "%jd/%jd/%jd\n", 807 (intmax_t)tsize, 808 (intmax_t)vap->va_size, 809 (intmax_t)np->n_size); 810 goto again; 811 } 812 if (error && vap->va_size != VNOVAL) { 813 np->n_size = np->n_vattr.va_size = tsize; 814 boff = (int)np->n_size & (biosize - 1); 815 vnode_pager_setsize(vp, np->n_size); 816 } 817 return (error); 818 } 819 820 /* 821 * Do an nfs setattr rpc. 822 */ 823 static int 824 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 825 struct ucred *cred, struct thread *td) 826 { 827 struct nfsv2_sattr *sp; 828 struct nfsnode *np = VTONFS(vp); 829 u_int32_t *tl; 830 int error = 0, wccflag = NFSV3_WCCRATTR; 831 struct nfsm_info info; 832 833 info.mrep = NULL; 834 info.v3 = NFS_ISV3(vp); 835 836 nfsstats.rpccnt[NFSPROC_SETATTR]++; 837 nfsm_reqhead(&info, vp, NFSPROC_SETATTR, 838 NFSX_FH(info.v3) + NFSX_SATTR(info.v3)); 839 ERROROUT(nfsm_fhtom(&info, vp)); 840 if (info.v3) { 841 nfsm_v3attrbuild(&info, vap, TRUE); 842 tl = nfsm_build(&info, NFSX_UNSIGNED); 843 *tl = nfs_false; 844 } else { 845 sp = nfsm_build(&info, NFSX_V2SATTR); 846 if (vap->va_mode == (mode_t)VNOVAL) 847 sp->sa_mode = nfs_xdrneg1; 848 else 849 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 850 if (vap->va_uid == (uid_t)VNOVAL) 851 sp->sa_uid = nfs_xdrneg1; 852 else 853 sp->sa_uid = txdr_unsigned(vap->va_uid); 854 if (vap->va_gid == (gid_t)VNOVAL) 855 sp->sa_gid = nfs_xdrneg1; 856 else 857 sp->sa_gid = txdr_unsigned(vap->va_gid); 858 sp->sa_size = txdr_unsigned(vap->va_size); 859 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 860 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 861 } 862 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_SETATTR, td, cred, &error)); 863 if (info.v3) { 864 np->n_modestamp = 0; 865 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 866 } else { 867 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 868 } 869 m_freem(info.mrep); 870 info.mrep = NULL; 871 nfsmout: 872 return (error); 873 } 874 875 static 876 void 877 nfs_cache_setvp(struct nchandle *nch, struct vnode *vp, int nctimeout) 878 { 879 if (nctimeout == 0) 880 nctimeout = 1; 881 else 882 nctimeout *= hz; 883 cache_setvp(nch, vp); 884 cache_settimeout(nch, nctimeout); 885 } 886 887 /* 888 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 889 * nfs_lookup() until all remaining new api calls are implemented. 890 * 891 * Resolve a namecache entry. This function is passed a locked ncp and 892 * must call nfs_cache_setvp() on it as appropriate to resolve the entry. 893 */ 894 static int 895 nfs_nresolve(struct vop_nresolve_args *ap) 896 { 897 struct thread *td = curthread; 898 struct namecache *ncp; 899 struct ucred *cred; 900 struct nfsnode *np; 901 struct vnode *dvp; 902 struct vnode *nvp; 903 nfsfh_t *fhp; 904 int attrflag; 905 int fhsize; 906 int error; 907 int tmp_error; 908 int len; 909 struct nfsm_info info; 910 911 cred = ap->a_cred; 912 dvp = ap->a_dvp; 913 914 if ((error = vget(dvp, LK_SHARED)) != 0) 915 return (error); 916 917 info.mrep = NULL; 918 info.v3 = NFS_ISV3(dvp); 919 920 nvp = NULL; 921 nfsstats.lookupcache_misses++; 922 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 923 ncp = ap->a_nch->ncp; 924 len = ncp->nc_nlen; 925 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 926 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 927 ERROROUT(nfsm_fhtom(&info, dvp)); 928 ERROROUT(nfsm_strtom(&info, ncp->nc_name, len, NFS_MAXNAMLEN)); 929 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, 930 ap->a_cred, &error)); 931 if (error) { 932 /* 933 * Cache negatve lookups to reduce NFS traffic, but use 934 * a fast timeout. Otherwise use a timeout of 1 tick. 935 * XXX we should add a namecache flag for no-caching 936 * to uncache the negative hit as soon as possible, but 937 * we cannot simply destroy the entry because it is used 938 * as a placeholder by the caller. 939 * 940 * The refactored nfs code will overwrite a non-zero error 941 * with 0 when we use ERROROUT(), so don't here. 942 */ 943 if (error == ENOENT) 944 nfs_cache_setvp(ap->a_nch, NULL, nfsneg_cache_timeout); 945 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 946 NFS_LATTR_NOSHRINK); 947 if (tmp_error) { 948 error = tmp_error; 949 goto nfsmout; 950 } 951 m_freem(info.mrep); 952 info.mrep = NULL; 953 goto nfsmout; 954 } 955 956 /* 957 * Success, get the file handle, do various checks, and load 958 * post-operation data from the reply packet. Theoretically 959 * we should never be looking up "." so, theoretically, we 960 * should never get the same file handle as our directory. But 961 * we check anyway. XXX 962 * 963 * Note that no timeout is set for the positive cache hit. We 964 * assume, theoretically, that ESTALE returns will be dealt with 965 * properly to handle NFS races and in anycase we cannot depend 966 * on a timeout to deal with NFS open/create/excl issues so instead 967 * of a bad hack here the rest of the NFS client code needs to do 968 * the right thing. 969 */ 970 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 971 972 np = VTONFS(dvp); 973 if (NFS_CMPFH(np, fhp, fhsize)) { 974 vref(dvp); 975 nvp = dvp; 976 } else { 977 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 978 if (error) { 979 m_freem(info.mrep); 980 info.mrep = NULL; 981 vput(dvp); 982 return (error); 983 } 984 nvp = NFSTOV(np); 985 } 986 if (info.v3) { 987 ERROROUT(nfsm_postop_attr(&info, nvp, &attrflag, 988 NFS_LATTR_NOSHRINK)); 989 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 990 NFS_LATTR_NOSHRINK)); 991 } else { 992 ERROROUT(nfsm_loadattr(&info, nvp, NULL)); 993 } 994 nfs_cache_setvp(ap->a_nch, nvp, nfspos_cache_timeout); 995 m_freem(info.mrep); 996 info.mrep = NULL; 997 nfsmout: 998 vput(dvp); 999 if (nvp) { 1000 if (nvp == dvp) 1001 vrele(nvp); 1002 else 1003 vput(nvp); 1004 } 1005 return (error); 1006 } 1007 1008 /* 1009 * 'cached' nfs directory lookup 1010 * 1011 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 1012 * 1013 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 1014 * struct componentname *a_cnp) 1015 */ 1016 static int 1017 nfs_lookup(struct vop_old_lookup_args *ap) 1018 { 1019 struct componentname *cnp = ap->a_cnp; 1020 struct vnode *dvp = ap->a_dvp; 1021 struct vnode **vpp = ap->a_vpp; 1022 int flags = cnp->cn_flags; 1023 struct vnode *newvp; 1024 struct nfsmount *nmp; 1025 long len; 1026 nfsfh_t *fhp; 1027 struct nfsnode *np; 1028 int lockparent, wantparent, attrflag, fhsize; 1029 int error; 1030 int tmp_error; 1031 struct nfsm_info info; 1032 1033 info.mrep = NULL; 1034 info.v3 = NFS_ISV3(dvp); 1035 error = 0; 1036 1037 /* 1038 * Read-only mount check and directory check. 1039 */ 1040 *vpp = NULLVP; 1041 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 1042 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 1043 return (EROFS); 1044 1045 if (dvp->v_type != VDIR) 1046 return (ENOTDIR); 1047 1048 /* 1049 * Look it up in the cache. Note that ENOENT is only returned if we 1050 * previously entered a negative hit (see later on). The additional 1051 * nfsneg_cache_timeout check causes previously cached results to 1052 * be instantly ignored if the negative caching is turned off. 1053 */ 1054 lockparent = flags & CNP_LOCKPARENT; 1055 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 1056 nmp = VFSTONFS(dvp->v_mount); 1057 np = VTONFS(dvp); 1058 1059 /* 1060 * Go to the wire. 1061 */ 1062 error = 0; 1063 newvp = NULLVP; 1064 nfsstats.lookupcache_misses++; 1065 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1066 len = cnp->cn_namelen; 1067 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 1068 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1069 ERROROUT(nfsm_fhtom(&info, dvp)); 1070 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 1071 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, cnp->cn_td, 1072 cnp->cn_cred, &error)); 1073 if (error) { 1074 tmp_error = nfsm_postop_attr(&info, dvp, &attrflag, 1075 NFS_LATTR_NOSHRINK); 1076 if (tmp_error) { 1077 error = tmp_error; 1078 goto nfsmout; 1079 } 1080 1081 m_freem(info.mrep); 1082 info.mrep = NULL; 1083 goto nfsmout; 1084 } 1085 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 1086 1087 /* 1088 * Handle RENAME case... 1089 */ 1090 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1091 if (NFS_CMPFH(np, fhp, fhsize)) { 1092 m_freem(info.mrep); 1093 info.mrep = NULL; 1094 return (EISDIR); 1095 } 1096 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1097 if (error) { 1098 m_freem(info.mrep); 1099 info.mrep = NULL; 1100 return (error); 1101 } 1102 newvp = NFSTOV(np); 1103 if (info.v3) { 1104 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1105 NFS_LATTR_NOSHRINK)); 1106 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1107 NFS_LATTR_NOSHRINK)); 1108 } else { 1109 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1110 } 1111 *vpp = newvp; 1112 m_freem(info.mrep); 1113 info.mrep = NULL; 1114 if (!lockparent) { 1115 vn_unlock(dvp); 1116 cnp->cn_flags |= CNP_PDIRUNLOCK; 1117 } 1118 return (0); 1119 } 1120 1121 if (flags & CNP_ISDOTDOT) { 1122 vn_unlock(dvp); 1123 cnp->cn_flags |= CNP_PDIRUNLOCK; 1124 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1125 if (error) { 1126 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1127 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1128 return (error); /* NOTE: return error from nget */ 1129 } 1130 newvp = NFSTOV(np); 1131 if (lockparent) { 1132 error = vn_lock(dvp, LK_EXCLUSIVE); 1133 if (error) { 1134 vput(newvp); 1135 return (error); 1136 } 1137 cnp->cn_flags |= CNP_PDIRUNLOCK; 1138 } 1139 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1140 vref(dvp); 1141 newvp = dvp; 1142 } else { 1143 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1144 if (error) { 1145 m_freem(info.mrep); 1146 info.mrep = NULL; 1147 return (error); 1148 } 1149 if (!lockparent) { 1150 vn_unlock(dvp); 1151 cnp->cn_flags |= CNP_PDIRUNLOCK; 1152 } 1153 newvp = NFSTOV(np); 1154 } 1155 if (info.v3) { 1156 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 1157 NFS_LATTR_NOSHRINK)); 1158 ERROROUT(nfsm_postop_attr(&info, dvp, &attrflag, 1159 NFS_LATTR_NOSHRINK)); 1160 } else { 1161 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 1162 } 1163 #if 0 1164 /* XXX MOVE TO nfs_nremove() */ 1165 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1166 cnp->cn_nameiop != NAMEI_DELETE) { 1167 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1168 } 1169 #endif 1170 *vpp = newvp; 1171 m_freem(info.mrep); 1172 info.mrep = NULL; 1173 nfsmout: 1174 if (error) { 1175 if (newvp != NULLVP) { 1176 vrele(newvp); 1177 *vpp = NULLVP; 1178 } 1179 if ((cnp->cn_nameiop == NAMEI_CREATE || 1180 cnp->cn_nameiop == NAMEI_RENAME) && 1181 error == ENOENT) { 1182 if (!lockparent) { 1183 vn_unlock(dvp); 1184 cnp->cn_flags |= CNP_PDIRUNLOCK; 1185 } 1186 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1187 error = EROFS; 1188 else 1189 error = EJUSTRETURN; 1190 } 1191 } 1192 return (error); 1193 } 1194 1195 /* 1196 * nfs read call. 1197 * Just call nfs_bioread() to do the work. 1198 * 1199 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1200 * struct ucred *a_cred) 1201 */ 1202 static int 1203 nfs_read(struct vop_read_args *ap) 1204 { 1205 struct vnode *vp = ap->a_vp; 1206 1207 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1208 } 1209 1210 /* 1211 * nfs readlink call 1212 * 1213 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1214 */ 1215 static int 1216 nfs_readlink(struct vop_readlink_args *ap) 1217 { 1218 struct vnode *vp = ap->a_vp; 1219 1220 if (vp->v_type != VLNK) 1221 return (EINVAL); 1222 return (nfs_bioread(vp, ap->a_uio, 0)); 1223 } 1224 1225 /* 1226 * Do a readlink rpc. 1227 * Called by nfs_doio() from below the buffer cache. 1228 */ 1229 int 1230 nfs_readlinkrpc_uio(struct vnode *vp, struct uio *uiop) 1231 { 1232 int error = 0, len, attrflag; 1233 struct nfsm_info info; 1234 1235 info.mrep = NULL; 1236 info.v3 = NFS_ISV3(vp); 1237 1238 nfsstats.rpccnt[NFSPROC_READLINK]++; 1239 nfsm_reqhead(&info, vp, NFSPROC_READLINK, NFSX_FH(info.v3)); 1240 ERROROUT(nfsm_fhtom(&info, vp)); 1241 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READLINK, uiop->uio_td, 1242 nfs_vpcred(vp, ND_CHECK), &error)); 1243 if (info.v3) { 1244 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1245 NFS_LATTR_NOSHRINK)); 1246 } 1247 if (!error) { 1248 NEGATIVEOUT(len = nfsm_strsiz(&info, NFS_MAXPATHLEN)); 1249 if (len == NFS_MAXPATHLEN) { 1250 struct nfsnode *np = VTONFS(vp); 1251 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1252 len = np->n_size; 1253 } 1254 ERROROUT(nfsm_mtouio(&info, uiop, len)); 1255 } 1256 m_freem(info.mrep); 1257 info.mrep = NULL; 1258 nfsmout: 1259 return (error); 1260 } 1261 1262 /* 1263 * nfs synchronous read rpc using UIO 1264 */ 1265 int 1266 nfs_readrpc_uio(struct vnode *vp, struct uio *uiop) 1267 { 1268 u_int32_t *tl; 1269 struct nfsmount *nmp; 1270 int error = 0, len, retlen, tsiz, eof, attrflag; 1271 struct nfsm_info info; 1272 off_t tmp_off; 1273 1274 info.mrep = NULL; 1275 info.v3 = NFS_ISV3(vp); 1276 1277 #ifndef nolint 1278 eof = 0; 1279 #endif 1280 nmp = VFSTONFS(vp->v_mount); 1281 tsiz = uiop->uio_resid; 1282 tmp_off = uiop->uio_offset + tsiz; 1283 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uiop->uio_offset) 1284 return (EFBIG); 1285 tmp_off = uiop->uio_offset; 1286 while (tsiz > 0) { 1287 nfsstats.rpccnt[NFSPROC_READ]++; 1288 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1289 nfsm_reqhead(&info, vp, NFSPROC_READ, 1290 NFSX_FH(info.v3) + NFSX_UNSIGNED * 3); 1291 ERROROUT(nfsm_fhtom(&info, vp)); 1292 tl = nfsm_build(&info, NFSX_UNSIGNED * 3); 1293 if (info.v3) { 1294 txdr_hyper(uiop->uio_offset, tl); 1295 *(tl + 2) = txdr_unsigned(len); 1296 } else { 1297 *tl++ = txdr_unsigned(uiop->uio_offset); 1298 *tl++ = txdr_unsigned(len); 1299 *tl = 0; 1300 } 1301 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READ, uiop->uio_td, 1302 nfs_vpcred(vp, ND_READ), &error)); 1303 if (info.v3) { 1304 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1305 NFS_LATTR_NOSHRINK)); 1306 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 1307 eof = fxdr_unsigned(int, *(tl + 1)); 1308 } else { 1309 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1310 } 1311 NEGATIVEOUT(retlen = nfsm_strsiz(&info, len)); 1312 ERROROUT(nfsm_mtouio(&info, uiop, retlen)); 1313 m_freem(info.mrep); 1314 info.mrep = NULL; 1315 1316 /* 1317 * Handle short-read from server (NFSv3). If EOF is not 1318 * flagged (and no error occurred), but retlen is less 1319 * then the request size, we must zero-fill the remainder. 1320 */ 1321 if (retlen < len && info.v3 && eof == 0) { 1322 ERROROUT(uiomovez(len - retlen, uiop)); 1323 retlen = len; 1324 } 1325 tsiz -= retlen; 1326 1327 /* 1328 * Terminate loop on EOF or zero-length read. 1329 * 1330 * For NFSv2 a short-read indicates EOF, not zero-fill, 1331 * and also terminates the loop. 1332 */ 1333 if (info.v3) { 1334 if (eof || retlen == 0) 1335 tsiz = 0; 1336 } else if (retlen < len) { 1337 tsiz = 0; 1338 } 1339 } 1340 nfsmout: 1341 return (error); 1342 } 1343 1344 /* 1345 * nfs write call 1346 */ 1347 int 1348 nfs_writerpc_uio(struct vnode *vp, struct uio *uiop, 1349 int *iomode, int *must_commit) 1350 { 1351 u_int32_t *tl; 1352 int32_t backup; 1353 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1354 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1355 int committed = NFSV3WRITE_FILESYNC; 1356 struct nfsm_info info; 1357 1358 info.mrep = NULL; 1359 info.v3 = NFS_ISV3(vp); 1360 1361 #ifndef DIAGNOSTIC 1362 if (uiop->uio_iovcnt != 1) 1363 panic("nfs: writerpc iovcnt > 1"); 1364 #endif 1365 *must_commit = 0; 1366 tsiz = uiop->uio_resid; 1367 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1368 return (EFBIG); 1369 while (tsiz > 0) { 1370 nfsstats.rpccnt[NFSPROC_WRITE]++; 1371 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1372 nfsm_reqhead(&info, vp, NFSPROC_WRITE, 1373 NFSX_FH(info.v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1374 ERROROUT(nfsm_fhtom(&info, vp)); 1375 if (info.v3) { 1376 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 1377 txdr_hyper(uiop->uio_offset, tl); 1378 tl += 2; 1379 *tl++ = txdr_unsigned(len); 1380 *tl++ = txdr_unsigned(*iomode); 1381 *tl = txdr_unsigned(len); 1382 } else { 1383 u_int32_t x; 1384 1385 tl = nfsm_build(&info, 4 * NFSX_UNSIGNED); 1386 /* Set both "begin" and "current" to non-garbage. */ 1387 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1388 *tl++ = x; /* "begin offset" */ 1389 *tl++ = x; /* "current offset" */ 1390 x = txdr_unsigned(len); 1391 *tl++ = x; /* total to this offset */ 1392 *tl = x; /* size of this write */ 1393 } 1394 ERROROUT(nfsm_uiotom(&info, uiop, len)); 1395 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_WRITE, uiop->uio_td, 1396 nfs_vpcred(vp, ND_WRITE), &error)); 1397 if (info.v3) { 1398 /* 1399 * The write RPC returns a before and after mtime. The 1400 * nfsm_wcc_data() macro checks the before n_mtime 1401 * against the before time and stores the after time 1402 * in the nfsnode's cached vattr and n_mtime field. 1403 * The NRMODIFIED bit will be set if the before 1404 * time did not match the original mtime. 1405 */ 1406 wccflag = NFSV3_WCCCHK; 1407 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 1408 if (error == 0) { 1409 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED + NFSX_V3WRITEVERF)); 1410 rlen = fxdr_unsigned(int, *tl++); 1411 if (rlen == 0) { 1412 error = NFSERR_IO; 1413 m_freem(info.mrep); 1414 info.mrep = NULL; 1415 break; 1416 } else if (rlen < len) { 1417 backup = len - rlen; 1418 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base - backup; 1419 uiop->uio_iov->iov_len += backup; 1420 uiop->uio_offset -= backup; 1421 uiop->uio_resid += backup; 1422 len = rlen; 1423 } 1424 commit = fxdr_unsigned(int, *tl++); 1425 1426 /* 1427 * Return the lowest committment level 1428 * obtained by any of the RPCs. 1429 */ 1430 if (committed == NFSV3WRITE_FILESYNC) 1431 committed = commit; 1432 else if (committed == NFSV3WRITE_DATASYNC && 1433 commit == NFSV3WRITE_UNSTABLE) 1434 committed = commit; 1435 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1436 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1437 NFSX_V3WRITEVERF); 1438 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1439 } else if (bcmp((caddr_t)tl, 1440 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1441 *must_commit = 1; 1442 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1443 NFSX_V3WRITEVERF); 1444 } 1445 } 1446 } else { 1447 ERROROUT(nfsm_loadattr(&info, vp, NULL)); 1448 } 1449 m_freem(info.mrep); 1450 info.mrep = NULL; 1451 if (error) 1452 break; 1453 tsiz -= len; 1454 } 1455 nfsmout: 1456 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1457 committed = NFSV3WRITE_FILESYNC; 1458 *iomode = committed; 1459 if (error) 1460 uiop->uio_resid = tsiz; 1461 return (error); 1462 } 1463 1464 /* 1465 * nfs mknod rpc 1466 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1467 * mode set to specify the file type and the size field for rdev. 1468 */ 1469 static int 1470 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1471 struct vattr *vap) 1472 { 1473 struct nfsv2_sattr *sp; 1474 u_int32_t *tl; 1475 struct vnode *newvp = NULL; 1476 struct nfsnode *np = NULL; 1477 struct vattr vattr; 1478 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1479 int rmajor, rminor; 1480 struct nfsm_info info; 1481 1482 info.mrep = NULL; 1483 info.v3 = NFS_ISV3(dvp); 1484 1485 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1486 rmajor = txdr_unsigned(vap->va_rmajor); 1487 rminor = txdr_unsigned(vap->va_rminor); 1488 } else if (vap->va_type == VFIFO || vap->va_type == VSOCK) { 1489 rmajor = nfs_xdrneg1; 1490 rminor = nfs_xdrneg1; 1491 } else { 1492 return (EOPNOTSUPP); 1493 } 1494 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1495 return (error); 1496 } 1497 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1498 nfsm_reqhead(&info, dvp, NFSPROC_MKNOD, 1499 NFSX_FH(info.v3) + 4 * NFSX_UNSIGNED + 1500 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1501 ERROROUT(nfsm_fhtom(&info, dvp)); 1502 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1503 NFS_MAXNAMLEN)); 1504 if (info.v3) { 1505 tl = nfsm_build(&info, NFSX_UNSIGNED); 1506 *tl++ = vtonfsv3_type(vap->va_type); 1507 nfsm_v3attrbuild(&info, vap, FALSE); 1508 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1509 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1510 *tl++ = txdr_unsigned(vap->va_rmajor); 1511 *tl = txdr_unsigned(vap->va_rminor); 1512 } 1513 } else { 1514 sp = nfsm_build(&info, NFSX_V2SATTR); 1515 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1516 sp->sa_uid = nfs_xdrneg1; 1517 sp->sa_gid = nfs_xdrneg1; 1518 sp->sa_size = makeudev(rmajor, rminor); 1519 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1520 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1521 } 1522 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKNOD, cnp->cn_td, 1523 cnp->cn_cred, &error)); 1524 if (!error) { 1525 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1526 if (!gotvp) { 1527 if (newvp) { 1528 vput(newvp); 1529 newvp = NULL; 1530 } 1531 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1532 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1533 if (!error) 1534 newvp = NFSTOV(np); 1535 } 1536 } 1537 if (info.v3) { 1538 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1539 } 1540 m_freem(info.mrep); 1541 info.mrep = NULL; 1542 nfsmout: 1543 if (error) { 1544 if (newvp) 1545 vput(newvp); 1546 } else { 1547 *vpp = newvp; 1548 } 1549 VTONFS(dvp)->n_flag |= NLMODIFIED; 1550 if (!wccflag) 1551 VTONFS(dvp)->n_attrstamp = 0; 1552 return (error); 1553 } 1554 1555 /* 1556 * nfs mknod vop 1557 * just call nfs_mknodrpc() to do the work. 1558 * 1559 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1560 * struct componentname *a_cnp, struct vattr *a_vap) 1561 */ 1562 /* ARGSUSED */ 1563 static int 1564 nfs_mknod(struct vop_old_mknod_args *ap) 1565 { 1566 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1567 } 1568 1569 static u_long create_verf; 1570 /* 1571 * nfs file create call 1572 * 1573 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1574 * struct componentname *a_cnp, struct vattr *a_vap) 1575 */ 1576 static int 1577 nfs_create(struct vop_old_create_args *ap) 1578 { 1579 struct vnode *dvp = ap->a_dvp; 1580 struct vattr *vap = ap->a_vap; 1581 struct componentname *cnp = ap->a_cnp; 1582 struct nfsv2_sattr *sp; 1583 u_int32_t *tl; 1584 struct nfsnode *np = NULL; 1585 struct vnode *newvp = NULL; 1586 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1587 struct vattr vattr; 1588 struct nfsm_info info; 1589 1590 info.mrep = NULL; 1591 info.v3 = NFS_ISV3(dvp); 1592 1593 /* 1594 * Oops, not for me.. 1595 */ 1596 if (vap->va_type == VSOCK) 1597 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1598 1599 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1600 return (error); 1601 } 1602 if (vap->va_vaflags & VA_EXCLUSIVE) 1603 fmode |= O_EXCL; 1604 again: 1605 nfsstats.rpccnt[NFSPROC_CREATE]++; 1606 nfsm_reqhead(&info, dvp, NFSPROC_CREATE, 1607 NFSX_FH(info.v3) + 2 * NFSX_UNSIGNED + 1608 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(info.v3)); 1609 ERROROUT(nfsm_fhtom(&info, dvp)); 1610 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1611 NFS_MAXNAMLEN)); 1612 if (info.v3) { 1613 tl = nfsm_build(&info, NFSX_UNSIGNED); 1614 if (fmode & O_EXCL) { 1615 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1616 tl = nfsm_build(&info, NFSX_V3CREATEVERF); 1617 #ifdef INET 1618 if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) 1619 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia)->sin_addr.s_addr; 1620 else 1621 #endif 1622 *tl++ = create_verf; 1623 *tl = ++create_verf; 1624 } else { 1625 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1626 nfsm_v3attrbuild(&info, vap, FALSE); 1627 } 1628 } else { 1629 sp = nfsm_build(&info, NFSX_V2SATTR); 1630 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1631 sp->sa_uid = nfs_xdrneg1; 1632 sp->sa_gid = nfs_xdrneg1; 1633 sp->sa_size = 0; 1634 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1635 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1636 } 1637 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_CREATE, cnp->cn_td, 1638 cnp->cn_cred, &error)); 1639 if (error == 0) { 1640 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 1641 if (!gotvp) { 1642 if (newvp) { 1643 vput(newvp); 1644 newvp = NULL; 1645 } 1646 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1647 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1648 if (!error) 1649 newvp = NFSTOV(np); 1650 } 1651 } 1652 if (info.v3) { 1653 if (error == 0) 1654 error = nfsm_wcc_data(&info, dvp, &wccflag); 1655 else 1656 (void)nfsm_wcc_data(&info, dvp, &wccflag); 1657 } 1658 m_freem(info.mrep); 1659 info.mrep = NULL; 1660 nfsmout: 1661 if (error) { 1662 if (info.v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1663 KKASSERT(newvp == NULL); 1664 fmode &= ~O_EXCL; 1665 goto again; 1666 } 1667 } else if (info.v3 && (fmode & O_EXCL)) { 1668 /* 1669 * We are normally called with only a partially initialized 1670 * VAP. Since the NFSv3 spec says that server may use the 1671 * file attributes to store the verifier, the spec requires 1672 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1673 * in atime, but we can't really assume that all servers will 1674 * so we ensure that our SETATTR sets both atime and mtime. 1675 */ 1676 if (vap->va_mtime.tv_sec == VNOVAL) 1677 vfs_timestamp(&vap->va_mtime); 1678 if (vap->va_atime.tv_sec == VNOVAL) 1679 vap->va_atime = vap->va_mtime; 1680 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1681 } 1682 if (error == 0) { 1683 /* 1684 * The new np may have enough info for access 1685 * checks, make sure rucred and wucred are 1686 * initialized for read and write rpc's. 1687 */ 1688 np = VTONFS(newvp); 1689 if (np->n_rucred == NULL) 1690 np->n_rucred = crhold(cnp->cn_cred); 1691 if (np->n_wucred == NULL) 1692 np->n_wucred = crhold(cnp->cn_cred); 1693 *ap->a_vpp = newvp; 1694 } else if (newvp) { 1695 vput(newvp); 1696 } 1697 VTONFS(dvp)->n_flag |= NLMODIFIED; 1698 if (!wccflag) 1699 VTONFS(dvp)->n_attrstamp = 0; 1700 return (error); 1701 } 1702 1703 /* 1704 * nfs file remove call 1705 * To try and make nfs semantics closer to ufs semantics, a file that has 1706 * other processes using the vnode is renamed instead of removed and then 1707 * removed later on the last close. 1708 * - If v_sysref.refcnt > 1 1709 * If a rename is not already in the works 1710 * call nfs_sillyrename() to set it up 1711 * else 1712 * do the remove rpc 1713 * 1714 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1715 * struct componentname *a_cnp) 1716 */ 1717 static int 1718 nfs_remove(struct vop_old_remove_args *ap) 1719 { 1720 struct vnode *vp = ap->a_vp; 1721 struct vnode *dvp = ap->a_dvp; 1722 struct componentname *cnp = ap->a_cnp; 1723 struct nfsnode *np = VTONFS(vp); 1724 int error = 0; 1725 struct vattr vattr; 1726 1727 #ifndef DIAGNOSTIC 1728 if (vp->v_sysref.refcnt < 1) 1729 panic("nfs_remove: bad v_sysref.refcnt"); 1730 #endif 1731 if (vp->v_type == VDIR) 1732 error = EPERM; 1733 else if (vp->v_sysref.refcnt == 1 || (np->n_sillyrename && 1734 VOP_GETATTR(vp, &vattr) == 0 && 1735 vattr.va_nlink > 1)) { 1736 /* 1737 * throw away biocache buffers, mainly to avoid 1738 * unnecessary delayed writes later. 1739 */ 1740 error = nfs_vinvalbuf(vp, 0, 1); 1741 /* Do the rpc */ 1742 if (error != EINTR) 1743 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1744 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1745 /* 1746 * Kludge City: If the first reply to the remove rpc is lost.. 1747 * the reply to the retransmitted request will be ENOENT 1748 * since the file was in fact removed 1749 * Therefore, we cheat and return success. 1750 */ 1751 if (error == ENOENT) 1752 error = 0; 1753 } else if (!np->n_sillyrename) { 1754 error = nfs_sillyrename(dvp, vp, cnp); 1755 } 1756 np->n_attrstamp = 0; 1757 return (error); 1758 } 1759 1760 /* 1761 * nfs file remove rpc called from nfs_inactive 1762 */ 1763 int 1764 nfs_removeit(struct sillyrename *sp) 1765 { 1766 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1767 sp->s_cred, NULL)); 1768 } 1769 1770 /* 1771 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1772 */ 1773 static int 1774 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1775 struct ucred *cred, struct thread *td) 1776 { 1777 int error = 0, wccflag = NFSV3_WCCRATTR; 1778 struct nfsm_info info; 1779 1780 info.mrep = NULL; 1781 info.v3 = NFS_ISV3(dvp); 1782 1783 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1784 nfsm_reqhead(&info, dvp, NFSPROC_REMOVE, 1785 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1786 ERROROUT(nfsm_fhtom(&info, dvp)); 1787 ERROROUT(nfsm_strtom(&info, name, namelen, NFS_MAXNAMLEN)); 1788 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_REMOVE, td, cred, &error)); 1789 if (info.v3) { 1790 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 1791 } 1792 m_freem(info.mrep); 1793 info.mrep = NULL; 1794 nfsmout: 1795 VTONFS(dvp)->n_flag |= NLMODIFIED; 1796 if (!wccflag) 1797 VTONFS(dvp)->n_attrstamp = 0; 1798 return (error); 1799 } 1800 1801 /* 1802 * nfs file rename call 1803 * 1804 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1805 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1806 * struct vnode *a_tvp, struct componentname *a_tcnp) 1807 */ 1808 static int 1809 nfs_rename(struct vop_old_rename_args *ap) 1810 { 1811 struct vnode *fvp = ap->a_fvp; 1812 struct vnode *tvp = ap->a_tvp; 1813 struct vnode *fdvp = ap->a_fdvp; 1814 struct vnode *tdvp = ap->a_tdvp; 1815 struct componentname *tcnp = ap->a_tcnp; 1816 struct componentname *fcnp = ap->a_fcnp; 1817 int error; 1818 1819 /* Check for cross-device rename */ 1820 if ((fvp->v_mount != tdvp->v_mount) || 1821 (tvp && (fvp->v_mount != tvp->v_mount))) { 1822 error = EXDEV; 1823 goto out; 1824 } 1825 1826 /* 1827 * We shouldn't have to flush fvp on rename for most server-side 1828 * filesystems as the file handle should not change. Unfortunately 1829 * the inode for some filesystems (msdosfs) might be tied to the 1830 * file name or directory position so to be completely safe 1831 * vfs.nfs.flush_on_rename is set by default. Clear to improve 1832 * performance. 1833 * 1834 * We must flush tvp on rename because it might become stale on the 1835 * server after the rename. 1836 */ 1837 if (nfs_flush_on_rename) 1838 VOP_FSYNC(fvp, MNT_WAIT, 0); 1839 if (tvp) 1840 VOP_FSYNC(tvp, MNT_WAIT, 0); 1841 1842 /* 1843 * If the tvp exists and is in use, sillyrename it before doing the 1844 * rename of the new file over it. 1845 * 1846 * XXX Can't sillyrename a directory. 1847 * 1848 * We do not attempt to do any namecache purges in this old API 1849 * routine. The new API compat functions have access to the actual 1850 * namecache structures and will do it for us. 1851 */ 1852 if (tvp && tvp->v_sysref.refcnt > 1 && !VTONFS(tvp)->n_sillyrename && 1853 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1854 vput(tvp); 1855 tvp = NULL; 1856 } else if (tvp) { 1857 ; 1858 } 1859 1860 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1861 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1862 tcnp->cn_td); 1863 1864 out: 1865 if (tdvp == tvp) 1866 vrele(tdvp); 1867 else 1868 vput(tdvp); 1869 if (tvp) 1870 vput(tvp); 1871 vrele(fdvp); 1872 vrele(fvp); 1873 /* 1874 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1875 */ 1876 if (error == ENOENT) 1877 error = 0; 1878 return (error); 1879 } 1880 1881 /* 1882 * nfs file rename rpc called from nfs_remove() above 1883 */ 1884 static int 1885 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1886 struct sillyrename *sp) 1887 { 1888 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1889 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1890 } 1891 1892 /* 1893 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1894 */ 1895 static int 1896 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1897 struct vnode *tdvp, const char *tnameptr, int tnamelen, 1898 struct ucred *cred, struct thread *td) 1899 { 1900 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1901 struct nfsm_info info; 1902 1903 info.mrep = NULL; 1904 info.v3 = NFS_ISV3(fdvp); 1905 1906 nfsstats.rpccnt[NFSPROC_RENAME]++; 1907 nfsm_reqhead(&info, fdvp, NFSPROC_RENAME, 1908 (NFSX_FH(info.v3) + NFSX_UNSIGNED)*2 + 1909 nfsm_rndup(fnamelen) + nfsm_rndup(tnamelen)); 1910 ERROROUT(nfsm_fhtom(&info, fdvp)); 1911 ERROROUT(nfsm_strtom(&info, fnameptr, fnamelen, NFS_MAXNAMLEN)); 1912 ERROROUT(nfsm_fhtom(&info, tdvp)); 1913 ERROROUT(nfsm_strtom(&info, tnameptr, tnamelen, NFS_MAXNAMLEN)); 1914 NEGKEEPOUT(nfsm_request(&info, fdvp, NFSPROC_RENAME, td, cred, &error)); 1915 if (info.v3) { 1916 ERROROUT(nfsm_wcc_data(&info, fdvp, &fwccflag)); 1917 ERROROUT(nfsm_wcc_data(&info, tdvp, &twccflag)); 1918 } 1919 m_freem(info.mrep); 1920 info.mrep = NULL; 1921 nfsmout: 1922 VTONFS(fdvp)->n_flag |= NLMODIFIED; 1923 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1924 if (!fwccflag) 1925 VTONFS(fdvp)->n_attrstamp = 0; 1926 if (!twccflag) 1927 VTONFS(tdvp)->n_attrstamp = 0; 1928 return (error); 1929 } 1930 1931 /* 1932 * nfs hard link create call 1933 * 1934 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 1935 * struct componentname *a_cnp) 1936 */ 1937 static int 1938 nfs_link(struct vop_old_link_args *ap) 1939 { 1940 struct vnode *vp = ap->a_vp; 1941 struct vnode *tdvp = ap->a_tdvp; 1942 struct componentname *cnp = ap->a_cnp; 1943 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1944 struct nfsm_info info; 1945 1946 if (vp->v_mount != tdvp->v_mount) { 1947 return (EXDEV); 1948 } 1949 1950 /* 1951 * The attribute cache may get out of sync with the server on link. 1952 * Pushing writes to the server before handle was inherited from 1953 * long long ago and it is unclear if we still need to do this. 1954 * Defaults to off. 1955 */ 1956 if (nfs_flush_on_hlink) 1957 VOP_FSYNC(vp, MNT_WAIT, 0); 1958 1959 info.mrep = NULL; 1960 info.v3 = NFS_ISV3(vp); 1961 1962 nfsstats.rpccnt[NFSPROC_LINK]++; 1963 nfsm_reqhead(&info, vp, NFSPROC_LINK, 1964 NFSX_FH(info.v3) * 2 + NFSX_UNSIGNED + 1965 nfsm_rndup(cnp->cn_namelen)); 1966 ERROROUT(nfsm_fhtom(&info, vp)); 1967 ERROROUT(nfsm_fhtom(&info, tdvp)); 1968 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 1969 NFS_MAXNAMLEN)); 1970 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_LINK, cnp->cn_td, 1971 cnp->cn_cred, &error)); 1972 if (info.v3) { 1973 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 1974 NFS_LATTR_NOSHRINK)); 1975 ERROROUT(nfsm_wcc_data(&info, tdvp, &wccflag)); 1976 } 1977 m_freem(info.mrep); 1978 info.mrep = NULL; 1979 nfsmout: 1980 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1981 if (!attrflag) 1982 VTONFS(vp)->n_attrstamp = 0; 1983 if (!wccflag) 1984 VTONFS(tdvp)->n_attrstamp = 0; 1985 /* 1986 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1987 */ 1988 if (error == EEXIST) 1989 error = 0; 1990 return (error); 1991 } 1992 1993 /* 1994 * nfs symbolic link create call 1995 * 1996 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1997 * struct componentname *a_cnp, struct vattr *a_vap, 1998 * char *a_target) 1999 */ 2000 static int 2001 nfs_symlink(struct vop_old_symlink_args *ap) 2002 { 2003 struct vnode *dvp = ap->a_dvp; 2004 struct vattr *vap = ap->a_vap; 2005 struct componentname *cnp = ap->a_cnp; 2006 struct nfsv2_sattr *sp; 2007 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 2008 struct vnode *newvp = NULL; 2009 struct nfsm_info info; 2010 2011 info.mrep = NULL; 2012 info.v3 = NFS_ISV3(dvp); 2013 2014 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 2015 slen = strlen(ap->a_target); 2016 nfsm_reqhead(&info, dvp, NFSPROC_SYMLINK, 2017 NFSX_FH(info.v3) + 2*NFSX_UNSIGNED + 2018 nfsm_rndup(cnp->cn_namelen) + 2019 nfsm_rndup(slen) + NFSX_SATTR(info.v3)); 2020 ERROROUT(nfsm_fhtom(&info, dvp)); 2021 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2022 NFS_MAXNAMLEN)); 2023 if (info.v3) { 2024 nfsm_v3attrbuild(&info, vap, FALSE); 2025 } 2026 ERROROUT(nfsm_strtom(&info, ap->a_target, slen, NFS_MAXPATHLEN)); 2027 if (info.v3 == 0) { 2028 sp = nfsm_build(&info, NFSX_V2SATTR); 2029 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 2030 sp->sa_uid = nfs_xdrneg1; 2031 sp->sa_gid = nfs_xdrneg1; 2032 sp->sa_size = nfs_xdrneg1; 2033 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2034 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2035 } 2036 2037 /* 2038 * Issue the NFS request and get the rpc response. 2039 * 2040 * Only NFSv3 responses returning an error of 0 actually return 2041 * a file handle that can be converted into newvp without having 2042 * to do an extra lookup rpc. 2043 */ 2044 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_SYMLINK, cnp->cn_td, 2045 cnp->cn_cred, &error)); 2046 if (info.v3) { 2047 if (error == 0) { 2048 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2049 } 2050 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2051 } 2052 2053 /* 2054 * out code jumps -> here, mrep is also freed. 2055 */ 2056 2057 m_freem(info.mrep); 2058 info.mrep = NULL; 2059 nfsmout: 2060 2061 /* 2062 * If we get an EEXIST error, silently convert it to no-error 2063 * in case of an NFS retry. 2064 */ 2065 if (error == EEXIST) 2066 error = 0; 2067 2068 /* 2069 * If we do not have (or no longer have) an error, and we could 2070 * not extract the newvp from the response due to the request being 2071 * NFSv2 or the error being EEXIST. We have to do a lookup in order 2072 * to obtain a newvp to return. 2073 */ 2074 if (error == 0 && newvp == NULL) { 2075 struct nfsnode *np = NULL; 2076 2077 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 2078 cnp->cn_cred, cnp->cn_td, &np); 2079 if (!error) 2080 newvp = NFSTOV(np); 2081 } 2082 if (error) { 2083 if (newvp) 2084 vput(newvp); 2085 } else { 2086 *ap->a_vpp = newvp; 2087 } 2088 VTONFS(dvp)->n_flag |= NLMODIFIED; 2089 if (!wccflag) 2090 VTONFS(dvp)->n_attrstamp = 0; 2091 return (error); 2092 } 2093 2094 /* 2095 * nfs make dir call 2096 * 2097 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 2098 * struct componentname *a_cnp, struct vattr *a_vap) 2099 */ 2100 static int 2101 nfs_mkdir(struct vop_old_mkdir_args *ap) 2102 { 2103 struct vnode *dvp = ap->a_dvp; 2104 struct vattr *vap = ap->a_vap; 2105 struct componentname *cnp = ap->a_cnp; 2106 struct nfsv2_sattr *sp; 2107 struct nfsnode *np = NULL; 2108 struct vnode *newvp = NULL; 2109 struct vattr vattr; 2110 int error = 0, wccflag = NFSV3_WCCRATTR; 2111 int gotvp = 0; 2112 int len; 2113 struct nfsm_info info; 2114 2115 info.mrep = NULL; 2116 info.v3 = NFS_ISV3(dvp); 2117 2118 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 2119 return (error); 2120 } 2121 len = cnp->cn_namelen; 2122 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2123 nfsm_reqhead(&info, dvp, NFSPROC_MKDIR, 2124 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2125 nfsm_rndup(len) + NFSX_SATTR(info.v3)); 2126 ERROROUT(nfsm_fhtom(&info, dvp)); 2127 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, len, NFS_MAXNAMLEN)); 2128 if (info.v3) { 2129 nfsm_v3attrbuild(&info, vap, FALSE); 2130 } else { 2131 sp = nfsm_build(&info, NFSX_V2SATTR); 2132 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2133 sp->sa_uid = nfs_xdrneg1; 2134 sp->sa_gid = nfs_xdrneg1; 2135 sp->sa_size = nfs_xdrneg1; 2136 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2137 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2138 } 2139 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_MKDIR, cnp->cn_td, 2140 cnp->cn_cred, &error)); 2141 if (error == 0) { 2142 ERROROUT(nfsm_mtofh(&info, dvp, &newvp, &gotvp)); 2143 } 2144 if (info.v3) { 2145 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2146 } 2147 m_freem(info.mrep); 2148 info.mrep = NULL; 2149 nfsmout: 2150 VTONFS(dvp)->n_flag |= NLMODIFIED; 2151 if (!wccflag) 2152 VTONFS(dvp)->n_attrstamp = 0; 2153 /* 2154 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2155 * if we can succeed in looking up the directory. 2156 */ 2157 if (error == EEXIST || (!error && !gotvp)) { 2158 if (newvp) { 2159 vrele(newvp); 2160 newvp = NULL; 2161 } 2162 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2163 cnp->cn_td, &np); 2164 if (!error) { 2165 newvp = NFSTOV(np); 2166 if (newvp->v_type != VDIR) 2167 error = EEXIST; 2168 } 2169 } 2170 if (error) { 2171 if (newvp) 2172 vrele(newvp); 2173 } else 2174 *ap->a_vpp = newvp; 2175 return (error); 2176 } 2177 2178 /* 2179 * nfs remove directory call 2180 * 2181 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2182 * struct componentname *a_cnp) 2183 */ 2184 static int 2185 nfs_rmdir(struct vop_old_rmdir_args *ap) 2186 { 2187 struct vnode *vp = ap->a_vp; 2188 struct vnode *dvp = ap->a_dvp; 2189 struct componentname *cnp = ap->a_cnp; 2190 int error = 0, wccflag = NFSV3_WCCRATTR; 2191 struct nfsm_info info; 2192 2193 info.mrep = NULL; 2194 info.v3 = NFS_ISV3(dvp); 2195 2196 if (dvp == vp) 2197 return (EINVAL); 2198 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2199 nfsm_reqhead(&info, dvp, NFSPROC_RMDIR, 2200 NFSX_FH(info.v3) + NFSX_UNSIGNED + 2201 nfsm_rndup(cnp->cn_namelen)); 2202 ERROROUT(nfsm_fhtom(&info, dvp)); 2203 ERROROUT(nfsm_strtom(&info, cnp->cn_nameptr, cnp->cn_namelen, 2204 NFS_MAXNAMLEN)); 2205 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_RMDIR, cnp->cn_td, 2206 cnp->cn_cred, &error)); 2207 if (info.v3) { 2208 ERROROUT(nfsm_wcc_data(&info, dvp, &wccflag)); 2209 } 2210 m_freem(info.mrep); 2211 info.mrep = NULL; 2212 nfsmout: 2213 VTONFS(dvp)->n_flag |= NLMODIFIED; 2214 if (!wccflag) 2215 VTONFS(dvp)->n_attrstamp = 0; 2216 /* 2217 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2218 */ 2219 if (error == ENOENT) 2220 error = 0; 2221 return (error); 2222 } 2223 2224 /* 2225 * nfs readdir call 2226 * 2227 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2228 */ 2229 static int 2230 nfs_readdir(struct vop_readdir_args *ap) 2231 { 2232 struct vnode *vp = ap->a_vp; 2233 struct nfsnode *np = VTONFS(vp); 2234 struct uio *uio = ap->a_uio; 2235 int tresid, error; 2236 struct vattr vattr; 2237 2238 if (vp->v_type != VDIR) 2239 return (EPERM); 2240 2241 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 2242 return (error); 2243 2244 /* 2245 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2246 * and then check that is still valid, or if this is an NQNFS mount 2247 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2248 * VOP_GETATTR() does not necessarily go to the wire. 2249 */ 2250 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2251 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2252 if (VOP_GETATTR(vp, &vattr) == 0 && 2253 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2254 ) { 2255 nfsstats.direofcache_hits++; 2256 goto done; 2257 } 2258 } 2259 2260 /* 2261 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2262 * own cache coherency checks so we do not have to. 2263 */ 2264 tresid = uio->uio_resid; 2265 error = nfs_bioread(vp, uio, 0); 2266 2267 if (!error && uio->uio_resid == tresid) 2268 nfsstats.direofcache_misses++; 2269 done: 2270 vn_unlock(vp); 2271 return (error); 2272 } 2273 2274 /* 2275 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2276 * 2277 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2278 * offset/block and converts the nfs formatted directory entries for userland 2279 * consumption as well as deals with offsets into the middle of blocks. 2280 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2281 * be block-bounded. It must convert to cookies for the actual RPC. 2282 */ 2283 int 2284 nfs_readdirrpc_uio(struct vnode *vp, struct uio *uiop) 2285 { 2286 int len, left; 2287 struct nfs_dirent *dp = NULL; 2288 u_int32_t *tl; 2289 nfsuint64 *cookiep; 2290 caddr_t cp; 2291 nfsuint64 cookie; 2292 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2293 struct nfsnode *dnp = VTONFS(vp); 2294 u_quad_t fileno; 2295 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2296 int attrflag; 2297 struct nfsm_info info; 2298 2299 info.mrep = NULL; 2300 info.v3 = NFS_ISV3(vp); 2301 2302 #ifndef DIAGNOSTIC 2303 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2304 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2305 panic("nfs readdirrpc bad uio"); 2306 #endif 2307 2308 /* 2309 * If there is no cookie, assume directory was stale. 2310 */ 2311 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2312 if (cookiep) 2313 cookie = *cookiep; 2314 else 2315 return (NFSERR_BAD_COOKIE); 2316 /* 2317 * Loop around doing readdir rpc's of size nm_readdirsize 2318 * truncated to a multiple of DIRBLKSIZ. 2319 * The stopping criteria is EOF or buffer full. 2320 */ 2321 while (more_dirs && bigenough) { 2322 nfsstats.rpccnt[NFSPROC_READDIR]++; 2323 nfsm_reqhead(&info, vp, NFSPROC_READDIR, 2324 NFSX_FH(info.v3) + NFSX_READDIR(info.v3)); 2325 ERROROUT(nfsm_fhtom(&info, vp)); 2326 if (info.v3) { 2327 tl = nfsm_build(&info, 5 * NFSX_UNSIGNED); 2328 *tl++ = cookie.nfsuquad[0]; 2329 *tl++ = cookie.nfsuquad[1]; 2330 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2331 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2332 } else { 2333 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 2334 *tl++ = cookie.nfsuquad[0]; 2335 } 2336 *tl = txdr_unsigned(nmp->nm_readdirsize); 2337 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIR, 2338 uiop->uio_td, 2339 nfs_vpcred(vp, ND_READ), &error)); 2340 if (info.v3) { 2341 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2342 NFS_LATTR_NOSHRINK)); 2343 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2344 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2345 dnp->n_cookieverf.nfsuquad[1] = *tl; 2346 } 2347 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2348 more_dirs = fxdr_unsigned(int, *tl); 2349 2350 /* loop thru the dir entries, converting them to std form */ 2351 while (more_dirs && bigenough) { 2352 if (info.v3) { 2353 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2354 fileno = fxdr_hyper(tl); 2355 len = fxdr_unsigned(int, *(tl + 2)); 2356 } else { 2357 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2358 fileno = fxdr_unsigned(u_quad_t, *tl++); 2359 len = fxdr_unsigned(int, *tl); 2360 } 2361 if (len <= 0 || len > NFS_MAXNAMLEN) { 2362 error = EBADRPC; 2363 m_freem(info.mrep); 2364 info.mrep = NULL; 2365 goto nfsmout; 2366 } 2367 2368 /* 2369 * len is the number of bytes in the path element 2370 * name, not including the \0 termination. 2371 * 2372 * tlen is the number of bytes w have to reserve for 2373 * the path element name. 2374 */ 2375 tlen = nfsm_rndup(len); 2376 if (tlen == len) 2377 tlen += 4; /* To ensure null termination */ 2378 2379 /* 2380 * If the entry would cross a DIRBLKSIZ boundary, 2381 * extend the previous nfs_dirent to cover the 2382 * remaining space. 2383 */ 2384 left = DIRBLKSIZ - blksiz; 2385 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2386 dp->nfs_reclen += left; 2387 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2388 uiop->uio_iov->iov_len -= left; 2389 uiop->uio_offset += left; 2390 uiop->uio_resid -= left; 2391 blksiz = 0; 2392 } 2393 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2394 bigenough = 0; 2395 if (bigenough) { 2396 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2397 dp->nfs_ino = fileno; 2398 dp->nfs_namlen = len; 2399 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2400 dp->nfs_type = DT_UNKNOWN; 2401 blksiz += dp->nfs_reclen; 2402 if (blksiz == DIRBLKSIZ) 2403 blksiz = 0; 2404 uiop->uio_offset += sizeof(struct nfs_dirent); 2405 uiop->uio_resid -= sizeof(struct nfs_dirent); 2406 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2407 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2408 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2409 2410 /* 2411 * The uiop has advanced by nfs_dirent + len 2412 * but really needs to advance by 2413 * nfs_dirent + tlen 2414 */ 2415 cp = uiop->uio_iov->iov_base; 2416 tlen -= len; 2417 *cp = '\0'; /* null terminate */ 2418 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2419 uiop->uio_iov->iov_len -= tlen; 2420 uiop->uio_offset += tlen; 2421 uiop->uio_resid -= tlen; 2422 } else { 2423 /* 2424 * NFS strings must be rounded up (nfsm_myouio 2425 * handled that in the bigenough case). 2426 */ 2427 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2428 } 2429 if (info.v3) { 2430 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2431 } else { 2432 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2433 } 2434 2435 /* 2436 * If we were able to accomodate the last entry, 2437 * get the cookie for the next one. Otherwise 2438 * hold-over the cookie for the one we were not 2439 * able to accomodate. 2440 */ 2441 if (bigenough) { 2442 cookie.nfsuquad[0] = *tl++; 2443 if (info.v3) 2444 cookie.nfsuquad[1] = *tl++; 2445 } else if (info.v3) { 2446 tl += 2; 2447 } else { 2448 tl++; 2449 } 2450 more_dirs = fxdr_unsigned(int, *tl); 2451 } 2452 /* 2453 * If at end of rpc data, get the eof boolean 2454 */ 2455 if (!more_dirs) { 2456 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2457 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2458 } 2459 m_freem(info.mrep); 2460 info.mrep = NULL; 2461 } 2462 /* 2463 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2464 * by increasing d_reclen for the last record. 2465 */ 2466 if (blksiz > 0) { 2467 left = DIRBLKSIZ - blksiz; 2468 dp->nfs_reclen += left; 2469 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2470 uiop->uio_iov->iov_len -= left; 2471 uiop->uio_offset += left; 2472 uiop->uio_resid -= left; 2473 } 2474 2475 if (bigenough) { 2476 /* 2477 * We hit the end of the directory, update direofoffset. 2478 */ 2479 dnp->n_direofoffset = uiop->uio_offset; 2480 } else { 2481 /* 2482 * There is more to go, insert the link cookie so the 2483 * next block can be read. 2484 */ 2485 if (uiop->uio_resid > 0) 2486 kprintf("EEK! readdirrpc resid > 0\n"); 2487 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2488 *cookiep = cookie; 2489 } 2490 nfsmout: 2491 return (error); 2492 } 2493 2494 /* 2495 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2496 */ 2497 int 2498 nfs_readdirplusrpc_uio(struct vnode *vp, struct uio *uiop) 2499 { 2500 int len, left; 2501 struct nfs_dirent *dp; 2502 u_int32_t *tl; 2503 struct vnode *newvp; 2504 nfsuint64 *cookiep; 2505 caddr_t dpossav1, dpossav2; 2506 caddr_t cp; 2507 struct mbuf *mdsav1, *mdsav2; 2508 nfsuint64 cookie; 2509 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2510 struct nfsnode *dnp = VTONFS(vp), *np; 2511 nfsfh_t *fhp; 2512 u_quad_t fileno; 2513 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2514 int attrflag, fhsize; 2515 struct nchandle nch; 2516 struct nchandle dnch; 2517 struct nlcomponent nlc; 2518 struct nfsm_info info; 2519 2520 info.mrep = NULL; 2521 info.v3 = 1; 2522 2523 #ifndef nolint 2524 dp = NULL; 2525 #endif 2526 #ifndef DIAGNOSTIC 2527 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2528 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2529 panic("nfs readdirplusrpc bad uio"); 2530 #endif 2531 /* 2532 * Obtain the namecache record for the directory so we have something 2533 * to use as a basis for creating the entries. This function will 2534 * return a held (but not locked) ncp. The ncp may be disconnected 2535 * from the tree and cannot be used for upward traversals, and the 2536 * ncp may be unnamed. Note that other unrelated operations may 2537 * cause the ncp to be named at any time. 2538 */ 2539 cache_fromdvp(vp, NULL, 0, &dnch); 2540 bzero(&nlc, sizeof(nlc)); 2541 newvp = NULLVP; 2542 2543 /* 2544 * If there is no cookie, assume directory was stale. 2545 */ 2546 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2547 if (cookiep) 2548 cookie = *cookiep; 2549 else 2550 return (NFSERR_BAD_COOKIE); 2551 /* 2552 * Loop around doing readdir rpc's of size nm_readdirsize 2553 * truncated to a multiple of DIRBLKSIZ. 2554 * The stopping criteria is EOF or buffer full. 2555 */ 2556 while (more_dirs && bigenough) { 2557 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2558 nfsm_reqhead(&info, vp, NFSPROC_READDIRPLUS, 2559 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2560 ERROROUT(nfsm_fhtom(&info, vp)); 2561 tl = nfsm_build(&info, 6 * NFSX_UNSIGNED); 2562 *tl++ = cookie.nfsuquad[0]; 2563 *tl++ = cookie.nfsuquad[1]; 2564 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2565 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2566 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2567 *tl = txdr_unsigned(nmp->nm_rsize); 2568 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_READDIRPLUS, 2569 uiop->uio_td, 2570 nfs_vpcred(vp, ND_READ), &error)); 2571 ERROROUT(nfsm_postop_attr(&info, vp, &attrflag, 2572 NFS_LATTR_NOSHRINK)); 2573 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2574 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2575 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2576 more_dirs = fxdr_unsigned(int, *tl); 2577 2578 /* loop thru the dir entries, doctoring them to 4bsd form */ 2579 while (more_dirs && bigenough) { 2580 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2581 fileno = fxdr_hyper(tl); 2582 len = fxdr_unsigned(int, *(tl + 2)); 2583 if (len <= 0 || len > NFS_MAXNAMLEN) { 2584 error = EBADRPC; 2585 m_freem(info.mrep); 2586 info.mrep = NULL; 2587 goto nfsmout; 2588 } 2589 tlen = nfsm_rndup(len); 2590 if (tlen == len) 2591 tlen += 4; /* To ensure null termination*/ 2592 left = DIRBLKSIZ - blksiz; 2593 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2594 dp->nfs_reclen += left; 2595 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2596 uiop->uio_iov->iov_len -= left; 2597 uiop->uio_offset += left; 2598 uiop->uio_resid -= left; 2599 blksiz = 0; 2600 } 2601 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2602 bigenough = 0; 2603 if (bigenough) { 2604 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2605 dp->nfs_ino = fileno; 2606 dp->nfs_namlen = len; 2607 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2608 dp->nfs_type = DT_UNKNOWN; 2609 blksiz += dp->nfs_reclen; 2610 if (blksiz == DIRBLKSIZ) 2611 blksiz = 0; 2612 uiop->uio_offset += sizeof(struct nfs_dirent); 2613 uiop->uio_resid -= sizeof(struct nfs_dirent); 2614 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2615 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2616 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2617 nlc.nlc_namelen = len; 2618 ERROROUT(nfsm_mtouio(&info, uiop, len)); 2619 cp = uiop->uio_iov->iov_base; 2620 tlen -= len; 2621 *cp = '\0'; 2622 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2623 uiop->uio_iov->iov_len -= tlen; 2624 uiop->uio_offset += tlen; 2625 uiop->uio_resid -= tlen; 2626 } else { 2627 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2628 } 2629 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2630 if (bigenough) { 2631 cookie.nfsuquad[0] = *tl++; 2632 cookie.nfsuquad[1] = *tl++; 2633 } else 2634 tl += 2; 2635 2636 /* 2637 * Since the attributes are before the file handle 2638 * (sigh), we must skip over the attributes and then 2639 * come back and get them. 2640 */ 2641 attrflag = fxdr_unsigned(int, *tl); 2642 if (attrflag) { 2643 dpossav1 = info.dpos; 2644 mdsav1 = info.md; 2645 ERROROUT(nfsm_adv(&info, NFSX_V3FATTR)); 2646 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2647 doit = fxdr_unsigned(int, *tl); 2648 if (doit) { 2649 NEGATIVEOUT(fhsize = nfsm_getfh(&info, &fhp)); 2650 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2651 vref(vp); 2652 newvp = vp; 2653 np = dnp; 2654 } else { 2655 error = nfs_nget(vp->v_mount, fhp, 2656 fhsize, &np); 2657 if (error) 2658 doit = 0; 2659 else 2660 newvp = NFSTOV(np); 2661 } 2662 } 2663 if (doit && bigenough) { 2664 dpossav2 = info.dpos; 2665 info.dpos = dpossav1; 2666 mdsav2 = info.md; 2667 info.md = mdsav1; 2668 ERROROUT(nfsm_loadattr(&info, newvp, NULL)); 2669 info.dpos = dpossav2; 2670 info.md = mdsav2; 2671 dp->nfs_type = 2672 IFTODT(VTTOIF(np->n_vattr.va_type)); 2673 if (dnch.ncp) { 2674 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2675 nlc.nlc_namelen, nlc.nlc_namelen, 2676 nlc.nlc_nameptr); 2677 nch = cache_nlookup(&dnch, &nlc); 2678 cache_setunresolved(&nch); 2679 nfs_cache_setvp(&nch, newvp, 2680 nfspos_cache_timeout); 2681 cache_put(&nch); 2682 } else { 2683 kprintf("NFS/READDIRPLUS, UNABLE TO ENTER" 2684 " %*.*s\n", 2685 nlc.nlc_namelen, nlc.nlc_namelen, 2686 nlc.nlc_nameptr); 2687 } 2688 } 2689 } else { 2690 /* Just skip over the file handle */ 2691 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2692 i = fxdr_unsigned(int, *tl); 2693 ERROROUT(nfsm_adv(&info, nfsm_rndup(i))); 2694 } 2695 if (newvp != NULLVP) { 2696 if (newvp == vp) 2697 vrele(newvp); 2698 else 2699 vput(newvp); 2700 newvp = NULLVP; 2701 } 2702 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2703 more_dirs = fxdr_unsigned(int, *tl); 2704 } 2705 /* 2706 * If at end of rpc data, get the eof boolean 2707 */ 2708 if (!more_dirs) { 2709 NULLOUT(tl = nfsm_dissect(&info, NFSX_UNSIGNED)); 2710 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2711 } 2712 m_freem(info.mrep); 2713 info.mrep = NULL; 2714 } 2715 /* 2716 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2717 * by increasing d_reclen for the last record. 2718 */ 2719 if (blksiz > 0) { 2720 left = DIRBLKSIZ - blksiz; 2721 dp->nfs_reclen += left; 2722 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2723 uiop->uio_iov->iov_len -= left; 2724 uiop->uio_offset += left; 2725 uiop->uio_resid -= left; 2726 } 2727 2728 /* 2729 * We are now either at the end of the directory or have filled the 2730 * block. 2731 */ 2732 if (bigenough) 2733 dnp->n_direofoffset = uiop->uio_offset; 2734 else { 2735 if (uiop->uio_resid > 0) 2736 kprintf("EEK! readdirplusrpc resid > 0\n"); 2737 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2738 *cookiep = cookie; 2739 } 2740 nfsmout: 2741 if (newvp != NULLVP) { 2742 if (newvp == vp) 2743 vrele(newvp); 2744 else 2745 vput(newvp); 2746 newvp = NULLVP; 2747 } 2748 if (dnch.ncp) 2749 cache_drop(&dnch); 2750 return (error); 2751 } 2752 2753 /* 2754 * Silly rename. To make the NFS filesystem that is stateless look a little 2755 * more like the "ufs" a remove of an active vnode is translated to a rename 2756 * to a funny looking filename that is removed by nfs_inactive on the 2757 * nfsnode. There is the potential for another process on a different client 2758 * to create the same funny name between the nfs_lookitup() fails and the 2759 * nfs_rename() completes, but... 2760 */ 2761 static int 2762 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2763 { 2764 struct sillyrename *sp; 2765 struct nfsnode *np; 2766 int error; 2767 2768 /* 2769 * We previously purged dvp instead of vp. I don't know why, it 2770 * completely destroys performance. We can't do it anyway with the 2771 * new VFS API since we would be breaking the namecache topology. 2772 */ 2773 cache_purge(vp); /* XXX */ 2774 np = VTONFS(vp); 2775 #ifndef DIAGNOSTIC 2776 if (vp->v_type == VDIR) 2777 panic("nfs: sillyrename dir"); 2778 #endif 2779 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2780 M_NFSREQ, M_WAITOK); 2781 sp->s_cred = crdup(cnp->cn_cred); 2782 sp->s_dvp = dvp; 2783 vref(dvp); 2784 2785 /* Fudge together a funny name */ 2786 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", 2787 (int)(intptr_t)cnp->cn_td); 2788 2789 /* Try lookitups until we get one that isn't there */ 2790 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2791 cnp->cn_td, NULL) == 0) { 2792 sp->s_name[4]++; 2793 if (sp->s_name[4] > 'z') { 2794 error = EINVAL; 2795 goto bad; 2796 } 2797 } 2798 error = nfs_renameit(dvp, cnp, sp); 2799 if (error) 2800 goto bad; 2801 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2802 cnp->cn_td, &np); 2803 np->n_sillyrename = sp; 2804 return (0); 2805 bad: 2806 vrele(sp->s_dvp); 2807 crfree(sp->s_cred); 2808 kfree((caddr_t)sp, M_NFSREQ); 2809 return (error); 2810 } 2811 2812 /* 2813 * Look up a file name and optionally either update the file handle or 2814 * allocate an nfsnode, depending on the value of npp. 2815 * npp == NULL --> just do the lookup 2816 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2817 * handled too 2818 * *npp != NULL --> update the file handle in the vnode 2819 */ 2820 static int 2821 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2822 struct thread *td, struct nfsnode **npp) 2823 { 2824 struct vnode *newvp = NULL; 2825 struct nfsnode *np, *dnp = VTONFS(dvp); 2826 int error = 0, fhlen, attrflag; 2827 nfsfh_t *nfhp; 2828 struct nfsm_info info; 2829 2830 info.mrep = NULL; 2831 info.v3 = NFS_ISV3(dvp); 2832 2833 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2834 nfsm_reqhead(&info, dvp, NFSPROC_LOOKUP, 2835 NFSX_FH(info.v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2836 ERROROUT(nfsm_fhtom(&info, dvp)); 2837 ERROROUT(nfsm_strtom(&info, name, len, NFS_MAXNAMLEN)); 2838 NEGKEEPOUT(nfsm_request(&info, dvp, NFSPROC_LOOKUP, td, cred, &error)); 2839 if (npp && !error) { 2840 NEGATIVEOUT(fhlen = nfsm_getfh(&info, &nfhp)); 2841 if (*npp) { 2842 np = *npp; 2843 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2844 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 2845 np->n_fhp = &np->n_fh; 2846 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2847 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 2848 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2849 np->n_fhsize = fhlen; 2850 newvp = NFSTOV(np); 2851 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2852 vref(dvp); 2853 newvp = dvp; 2854 } else { 2855 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2856 if (error) { 2857 m_freem(info.mrep); 2858 info.mrep = NULL; 2859 return (error); 2860 } 2861 newvp = NFSTOV(np); 2862 } 2863 if (info.v3) { 2864 ERROROUT(nfsm_postop_attr(&info, newvp, &attrflag, 2865 NFS_LATTR_NOSHRINK)); 2866 if (!attrflag && *npp == NULL) { 2867 m_freem(info.mrep); 2868 info.mrep = NULL; 2869 if (newvp == dvp) 2870 vrele(newvp); 2871 else 2872 vput(newvp); 2873 return (ENOENT); 2874 } 2875 } else { 2876 ERROROUT(error = nfsm_loadattr(&info, newvp, NULL)); 2877 } 2878 } 2879 m_freem(info.mrep); 2880 info.mrep = NULL; 2881 nfsmout: 2882 if (npp && *npp == NULL) { 2883 if (error) { 2884 if (newvp) { 2885 if (newvp == dvp) 2886 vrele(newvp); 2887 else 2888 vput(newvp); 2889 } 2890 } else 2891 *npp = np; 2892 } 2893 return (error); 2894 } 2895 2896 /* 2897 * Nfs Version 3 commit rpc 2898 * 2899 * We call it 'uio' to distinguish it from 'bio' but there is no real uio 2900 * involved. 2901 */ 2902 int 2903 nfs_commitrpc_uio(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2904 { 2905 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2906 int error = 0, wccflag = NFSV3_WCCRATTR; 2907 struct nfsm_info info; 2908 u_int32_t *tl; 2909 2910 info.mrep = NULL; 2911 info.v3 = 1; 2912 2913 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2914 return (0); 2915 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2916 nfsm_reqhead(&info, vp, NFSPROC_COMMIT, NFSX_FH(1)); 2917 ERROROUT(nfsm_fhtom(&info, vp)); 2918 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 2919 txdr_hyper(offset, tl); 2920 tl += 2; 2921 *tl = txdr_unsigned(cnt); 2922 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_COMMIT, td, 2923 nfs_vpcred(vp, ND_WRITE), &error)); 2924 ERROROUT(nfsm_wcc_data(&info, vp, &wccflag)); 2925 if (!error) { 2926 NULLOUT(tl = nfsm_dissect(&info, NFSX_V3WRITEVERF)); 2927 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2928 NFSX_V3WRITEVERF)) { 2929 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2930 NFSX_V3WRITEVERF); 2931 error = NFSERR_STALEWRITEVERF; 2932 } 2933 } 2934 m_freem(info.mrep); 2935 info.mrep = NULL; 2936 nfsmout: 2937 return (error); 2938 } 2939 2940 /* 2941 * Kludge City.. 2942 * - make nfs_bmap() essentially a no-op that does no translation 2943 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2944 * (Maybe I could use the process's page mapping, but I was concerned that 2945 * Kernel Write might not be enabled and also figured copyout() would do 2946 * a lot more work than bcopy() and also it currently happens in the 2947 * context of the swapper process (2). 2948 * 2949 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, 2950 * off_t *a_doffsetp, int *a_runp, int *a_runb) 2951 */ 2952 static int 2953 nfs_bmap(struct vop_bmap_args *ap) 2954 { 2955 if (ap->a_doffsetp != NULL) 2956 *ap->a_doffsetp = ap->a_loffset; 2957 if (ap->a_runp != NULL) 2958 *ap->a_runp = 0; 2959 if (ap->a_runb != NULL) 2960 *ap->a_runb = 0; 2961 return (0); 2962 } 2963 2964 /* 2965 * Strategy routine. 2966 */ 2967 static int 2968 nfs_strategy(struct vop_strategy_args *ap) 2969 { 2970 struct bio *bio = ap->a_bio; 2971 struct bio *nbio; 2972 struct buf *bp = bio->bio_buf; 2973 struct thread *td; 2974 int error; 2975 2976 KASSERT(bp->b_cmd != BUF_CMD_DONE, 2977 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 2978 KASSERT(BUF_REFCNT(bp) > 0, 2979 ("nfs_strategy: buffer %p not locked", bp)); 2980 2981 if (bio->bio_flags & BIO_SYNC) 2982 td = curthread; /* XXX */ 2983 else 2984 td = NULL; 2985 2986 /* 2987 * We probably don't need to push an nbio any more since no 2988 * block conversion is required due to the use of 64 bit byte 2989 * offsets, but do it anyway. 2990 * 2991 * NOTE: When NFS callers itself via this strategy routines and 2992 * sets up a synchronous I/O, it expects the I/O to run 2993 * synchronously (its bio_done routine just assumes it), 2994 * so for now we have to honor the bit. 2995 */ 2996 nbio = push_bio(bio); 2997 nbio->bio_offset = bio->bio_offset; 2998 nbio->bio_flags = bio->bio_flags & BIO_SYNC; 2999 3000 /* 3001 * If the op is asynchronous and an i/o daemon is waiting 3002 * queue the request, wake it up and wait for completion 3003 * otherwise just do it ourselves. 3004 */ 3005 if (bio->bio_flags & BIO_SYNC) { 3006 error = nfs_doio(ap->a_vp, nbio, td); 3007 } else { 3008 nfs_asyncio(ap->a_vp, nbio); 3009 error = 0; 3010 } 3011 return (error); 3012 } 3013 3014 /* 3015 * Mmap a file 3016 * 3017 * NB Currently unsupported. 3018 * 3019 * nfs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred) 3020 */ 3021 /* ARGSUSED */ 3022 static int 3023 nfs_mmap(struct vop_mmap_args *ap) 3024 { 3025 return (EINVAL); 3026 } 3027 3028 /* 3029 * fsync vnode op. Just call nfs_flush() with commit == 1. 3030 * 3031 * nfs_fsync(struct vnode *a_vp, int a_waitfor) 3032 */ 3033 /* ARGSUSED */ 3034 static int 3035 nfs_fsync(struct vop_fsync_args *ap) 3036 { 3037 return (nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1)); 3038 } 3039 3040 /* 3041 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 3042 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 3043 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 3044 * set the buffer contains data that has already been written to the server 3045 * and which now needs a commit RPC. 3046 * 3047 * If commit is 0 we only take one pass and only flush buffers containing new 3048 * dirty data. 3049 * 3050 * If commit is 1 we take two passes, issuing a commit RPC in the second 3051 * pass. 3052 * 3053 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 3054 * to completely flush all pending data. 3055 * 3056 * Note that the RB_SCAN code properly handles the case where the 3057 * callback might block and directly or indirectly (another thread) cause 3058 * the RB tree to change. 3059 */ 3060 3061 #ifndef NFS_COMMITBVECSIZ 3062 #define NFS_COMMITBVECSIZ 16 3063 #endif 3064 3065 struct nfs_flush_info { 3066 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 3067 struct thread *td; 3068 struct vnode *vp; 3069 int waitfor; 3070 int slpflag; 3071 int slptimeo; 3072 int loops; 3073 struct buf *bvary[NFS_COMMITBVECSIZ]; 3074 int bvsize; 3075 off_t beg_off; 3076 off_t end_off; 3077 }; 3078 3079 static int nfs_flush_bp(struct buf *bp, void *data); 3080 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 3081 3082 int 3083 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 3084 { 3085 struct nfsnode *np = VTONFS(vp); 3086 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 3087 struct nfs_flush_info info; 3088 lwkt_tokref vlock; 3089 int error; 3090 3091 bzero(&info, sizeof(info)); 3092 info.td = td; 3093 info.vp = vp; 3094 info.waitfor = waitfor; 3095 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 3096 info.loops = 0; 3097 lwkt_gettoken(&vlock, &vp->v_token); 3098 3099 do { 3100 /* 3101 * Flush mode 3102 */ 3103 info.mode = NFI_FLUSHNEW; 3104 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3105 nfs_flush_bp, &info); 3106 3107 /* 3108 * Take a second pass if committing and no error occured. 3109 * Clean up any left over collection (whether an error 3110 * occurs or not). 3111 */ 3112 if (commit && error == 0) { 3113 info.mode = NFI_COMMIT; 3114 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3115 nfs_flush_bp, &info); 3116 if (info.bvsize) 3117 error = nfs_flush_docommit(&info, error); 3118 } 3119 3120 /* 3121 * Wait for pending I/O to complete before checking whether 3122 * any further dirty buffers exist. 3123 */ 3124 while (waitfor == MNT_WAIT && 3125 bio_track_active(&vp->v_track_write)) { 3126 error = bio_track_wait(&vp->v_track_write, 3127 info.slpflag, info.slptimeo); 3128 if (error) { 3129 /* 3130 * We have to be able to break out if this 3131 * is an 'intr' mount. 3132 */ 3133 if (nfs_sigintr(nmp, NULL, td)) { 3134 error = -EINTR; 3135 break; 3136 } 3137 3138 /* 3139 * Since we do not process pending signals, 3140 * once we get a PCATCH our tsleep() will no 3141 * longer sleep, switch to a fixed timeout 3142 * instead. 3143 */ 3144 if (info.slpflag == PCATCH) { 3145 info.slpflag = 0; 3146 info.slptimeo = 2 * hz; 3147 } 3148 error = 0; 3149 } 3150 } 3151 ++info.loops; 3152 /* 3153 * Loop if we are flushing synchronous as well as committing, 3154 * and dirty buffers are still present. Otherwise we might livelock. 3155 */ 3156 } while (waitfor == MNT_WAIT && commit && 3157 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 3158 3159 /* 3160 * The callbacks have to return a negative error to terminate the 3161 * RB scan. 3162 */ 3163 if (error < 0) 3164 error = -error; 3165 3166 /* 3167 * Deal with any error collection 3168 */ 3169 if (np->n_flag & NWRITEERR) { 3170 error = np->n_error; 3171 np->n_flag &= ~NWRITEERR; 3172 } 3173 lwkt_reltoken(&vlock); 3174 return (error); 3175 } 3176 3177 static 3178 int 3179 nfs_flush_bp(struct buf *bp, void *data) 3180 { 3181 struct nfs_flush_info *info = data; 3182 int lkflags; 3183 int error; 3184 off_t toff; 3185 3186 error = 0; 3187 switch(info->mode) { 3188 case NFI_FLUSHNEW: 3189 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3190 if (error && info->loops && info->waitfor == MNT_WAIT) { 3191 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3192 if (error) { 3193 lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3194 if (info->slpflag & PCATCH) 3195 lkflags |= LK_PCATCH; 3196 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3197 info->slptimeo); 3198 } 3199 } 3200 3201 /* 3202 * Ignore locking errors 3203 */ 3204 if (error) { 3205 error = 0; 3206 break; 3207 } 3208 3209 /* 3210 * The buffer may have changed out from under us, even if 3211 * we did not block (MPSAFE). Check again now that it is 3212 * locked. 3213 */ 3214 if (bp->b_vp == info->vp && 3215 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) == B_DELWRI) { 3216 bremfree(bp); 3217 bawrite(bp); 3218 } else { 3219 BUF_UNLOCK(bp); 3220 } 3221 break; 3222 case NFI_COMMIT: 3223 /* 3224 * Only process buffers in need of a commit which we can 3225 * immediately lock. This may prevent a buffer from being 3226 * committed, but the normal flush loop will block on the 3227 * same buffer so we shouldn't get into an endless loop. 3228 */ 3229 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3230 (B_DELWRI | B_NEEDCOMMIT)) { 3231 break; 3232 } 3233 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 3234 break; 3235 3236 /* 3237 * We must recheck after successfully locking the buffer. 3238 */ 3239 if (bp->b_vp != info->vp || 3240 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3241 (B_DELWRI | B_NEEDCOMMIT)) { 3242 BUF_UNLOCK(bp); 3243 break; 3244 } 3245 3246 /* 3247 * NOTE: storing the bp in the bvary[] basically sets 3248 * it up for a commit operation. 3249 * 3250 * We must call vfs_busy_pages() now so the commit operation 3251 * is interlocked with user modifications to memory mapped 3252 * pages. The b_dirtyoff/b_dirtyend range is not correct 3253 * until after the pages have been busied. 3254 * 3255 * Note: to avoid loopback deadlocks, we do not 3256 * assign b_runningbufspace. 3257 */ 3258 bremfree(bp); 3259 bp->b_cmd = BUF_CMD_WRITE; 3260 vfs_busy_pages(bp->b_vp, bp); 3261 info->bvary[info->bvsize] = bp; 3262 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3263 if (info->bvsize == 0 || toff < info->beg_off) 3264 info->beg_off = toff; 3265 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3266 if (info->bvsize == 0 || toff > info->end_off) 3267 info->end_off = toff; 3268 ++info->bvsize; 3269 if (info->bvsize == NFS_COMMITBVECSIZ) { 3270 error = nfs_flush_docommit(info, 0); 3271 KKASSERT(info->bvsize == 0); 3272 } 3273 } 3274 return (error); 3275 } 3276 3277 static 3278 int 3279 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3280 { 3281 struct vnode *vp; 3282 struct buf *bp; 3283 off_t bytes; 3284 int retv; 3285 int i; 3286 3287 vp = info->vp; 3288 3289 if (info->bvsize > 0) { 3290 /* 3291 * Commit data on the server, as required. Note that 3292 * nfs_commit will use the vnode's cred for the commit. 3293 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3294 */ 3295 bytes = info->end_off - info->beg_off; 3296 if (bytes > 0x40000000) 3297 bytes = 0x40000000; 3298 if (error) { 3299 retv = -error; 3300 } else { 3301 retv = nfs_commitrpc_uio(vp, info->beg_off, 3302 (int)bytes, info->td); 3303 if (retv == NFSERR_STALEWRITEVERF) 3304 nfs_clearcommit(vp->v_mount); 3305 } 3306 3307 /* 3308 * Now, either mark the blocks I/O done or mark the 3309 * blocks dirty, depending on whether the commit 3310 * succeeded. 3311 */ 3312 for (i = 0; i < info->bvsize; ++i) { 3313 bp = info->bvary[i]; 3314 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3315 if (retv) { 3316 /* 3317 * Error, leave B_DELWRI intact 3318 */ 3319 vfs_unbusy_pages(bp); 3320 bp->b_cmd = BUF_CMD_DONE; 3321 brelse(bp); 3322 } else { 3323 /* 3324 * Success, remove B_DELWRI ( bundirty() ). 3325 * 3326 * b_dirtyoff/b_dirtyend seem to be NFS 3327 * specific. We should probably move that 3328 * into bundirty(). XXX 3329 * 3330 * We are faking an I/O write, we have to 3331 * start the transaction in order to 3332 * immediately biodone() it. 3333 */ 3334 bundirty(bp); 3335 bp->b_flags &= ~B_ERROR; 3336 bp->b_dirtyoff = bp->b_dirtyend = 0; 3337 biodone(&bp->b_bio1); 3338 } 3339 } 3340 info->bvsize = 0; 3341 } 3342 return (error); 3343 } 3344 3345 /* 3346 * NFS advisory byte-level locks. 3347 * Currently unsupported. 3348 * 3349 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3350 * int a_flags) 3351 */ 3352 static int 3353 nfs_advlock(struct vop_advlock_args *ap) 3354 { 3355 struct nfsnode *np = VTONFS(ap->a_vp); 3356 3357 /* 3358 * The following kludge is to allow diskless support to work 3359 * until a real NFS lockd is implemented. Basically, just pretend 3360 * that this is a local lock. 3361 */ 3362 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3363 } 3364 3365 /* 3366 * Print out the contents of an nfsnode. 3367 * 3368 * nfs_print(struct vnode *a_vp) 3369 */ 3370 static int 3371 nfs_print(struct vop_print_args *ap) 3372 { 3373 struct vnode *vp = ap->a_vp; 3374 struct nfsnode *np = VTONFS(vp); 3375 3376 kprintf("tag VT_NFS, fileid %lld fsid 0x%x", 3377 (long long)np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3378 if (vp->v_type == VFIFO) 3379 fifo_printinfo(vp); 3380 kprintf("\n"); 3381 return (0); 3382 } 3383 3384 /* 3385 * nfs special file access vnode op. 3386 * 3387 * nfs_laccess(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 3388 */ 3389 static int 3390 nfs_laccess(struct vop_access_args *ap) 3391 { 3392 struct vattr vattr; 3393 int error; 3394 3395 error = VOP_GETATTR(ap->a_vp, &vattr); 3396 if (!error) 3397 error = vop_helper_access(ap, vattr.va_uid, vattr.va_gid, 3398 vattr.va_mode, 0); 3399 return (error); 3400 } 3401 3402 /* 3403 * Read wrapper for fifos. 3404 * 3405 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3406 * struct ucred *a_cred) 3407 */ 3408 static int 3409 nfsfifo_read(struct vop_read_args *ap) 3410 { 3411 struct nfsnode *np = VTONFS(ap->a_vp); 3412 3413 /* 3414 * Set access flag. 3415 */ 3416 np->n_flag |= NACC; 3417 getnanotime(&np->n_atim); 3418 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3419 } 3420 3421 /* 3422 * Write wrapper for fifos. 3423 * 3424 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3425 * struct ucred *a_cred) 3426 */ 3427 static int 3428 nfsfifo_write(struct vop_write_args *ap) 3429 { 3430 struct nfsnode *np = VTONFS(ap->a_vp); 3431 3432 /* 3433 * Set update flag. 3434 */ 3435 np->n_flag |= NUPD; 3436 getnanotime(&np->n_mtim); 3437 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3438 } 3439 3440 /* 3441 * Close wrapper for fifos. 3442 * 3443 * Update the times on the nfsnode then do fifo close. 3444 * 3445 * nfsfifo_close(struct vnode *a_vp, int a_fflag) 3446 */ 3447 static int 3448 nfsfifo_close(struct vop_close_args *ap) 3449 { 3450 struct vnode *vp = ap->a_vp; 3451 struct nfsnode *np = VTONFS(vp); 3452 struct vattr vattr; 3453 struct timespec ts; 3454 3455 if (np->n_flag & (NACC | NUPD)) { 3456 getnanotime(&ts); 3457 if (np->n_flag & NACC) 3458 np->n_atim = ts; 3459 if (np->n_flag & NUPD) 3460 np->n_mtim = ts; 3461 np->n_flag |= NCHG; 3462 if (vp->v_sysref.refcnt == 1 && 3463 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3464 VATTR_NULL(&vattr); 3465 if (np->n_flag & NACC) 3466 vattr.va_atime = np->n_atim; 3467 if (np->n_flag & NUPD) 3468 vattr.va_mtime = np->n_mtim; 3469 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3470 } 3471 } 3472 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3473 } 3474 3475