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 1.64 2006/08/12 00:26:21 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 nfsspec_read (struct vop_read_args *); 98 static int nfsspec_write (struct vop_write_args *); 99 static int nfsfifo_read (struct vop_read_args *); 100 static int nfsfifo_write (struct vop_write_args *); 101 static int nfsspec_close (struct vop_close_args *); 102 static int nfsfifo_close (struct vop_close_args *); 103 #define nfs_poll vop_nopoll 104 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 105 static int nfs_lookup (struct vop_old_lookup_args *); 106 static int nfs_create (struct vop_old_create_args *); 107 static int nfs_mknod (struct vop_old_mknod_args *); 108 static int nfs_open (struct vop_open_args *); 109 static int nfs_close (struct vop_close_args *); 110 static int nfs_access (struct vop_access_args *); 111 static int nfs_getattr (struct vop_getattr_args *); 112 static int nfs_setattr (struct vop_setattr_args *); 113 static int nfs_read (struct vop_read_args *); 114 static int nfs_mmap (struct vop_mmap_args *); 115 static int nfs_fsync (struct vop_fsync_args *); 116 static int nfs_remove (struct vop_old_remove_args *); 117 static int nfs_link (struct vop_old_link_args *); 118 static int nfs_rename (struct vop_old_rename_args *); 119 static int nfs_mkdir (struct vop_old_mkdir_args *); 120 static int nfs_rmdir (struct vop_old_rmdir_args *); 121 static int nfs_symlink (struct vop_old_symlink_args *); 122 static int nfs_readdir (struct vop_readdir_args *); 123 static int nfs_bmap (struct vop_bmap_args *); 124 static int nfs_strategy (struct vop_strategy_args *); 125 static int nfs_lookitup (struct vnode *, const char *, int, 126 struct ucred *, struct thread *, struct nfsnode **); 127 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 128 static int nfsspec_access (struct vop_access_args *); 129 static int nfs_readlink (struct vop_readlink_args *); 130 static int nfs_print (struct vop_print_args *); 131 static int nfs_advlock (struct vop_advlock_args *); 132 133 static int nfs_nresolve (struct vop_nresolve_args *); 134 /* 135 * Global vfs data structures for nfs 136 */ 137 struct vop_ops nfsv2_vnode_vops = { 138 .vop_default = vop_defaultop, 139 .vop_access = nfs_access, 140 .vop_advlock = nfs_advlock, 141 .vop_bmap = nfs_bmap, 142 .vop_close = nfs_close, 143 .vop_old_create = nfs_create, 144 .vop_fsync = nfs_fsync, 145 .vop_getattr = nfs_getattr, 146 .vop_getpages = nfs_getpages, 147 .vop_putpages = nfs_putpages, 148 .vop_inactive = nfs_inactive, 149 .vop_old_link = nfs_link, 150 .vop_old_lookup = nfs_lookup, 151 .vop_old_mkdir = nfs_mkdir, 152 .vop_old_mknod = nfs_mknod, 153 .vop_mmap = nfs_mmap, 154 .vop_open = nfs_open, 155 .vop_poll = nfs_poll, 156 .vop_print = nfs_print, 157 .vop_read = nfs_read, 158 .vop_readdir = nfs_readdir, 159 .vop_readlink = nfs_readlink, 160 .vop_reclaim = nfs_reclaim, 161 .vop_old_remove = nfs_remove, 162 .vop_old_rename = nfs_rename, 163 .vop_old_rmdir = nfs_rmdir, 164 .vop_setattr = nfs_setattr, 165 .vop_strategy = nfs_strategy, 166 .vop_old_symlink = nfs_symlink, 167 .vop_write = nfs_write, 168 .vop_nresolve = nfs_nresolve 169 }; 170 171 /* 172 * Special device vnode ops 173 */ 174 struct vop_ops nfsv2_spec_vops = { 175 .vop_default = spec_vnoperate, 176 .vop_access = nfsspec_access, 177 .vop_close = nfsspec_close, 178 .vop_fsync = nfs_fsync, 179 .vop_getattr = nfs_getattr, 180 .vop_inactive = nfs_inactive, 181 .vop_print = nfs_print, 182 .vop_read = nfsspec_read, 183 .vop_reclaim = nfs_reclaim, 184 .vop_setattr = nfs_setattr, 185 .vop_write = nfsspec_write 186 }; 187 188 struct vop_ops nfsv2_fifo_vops = { 189 .vop_default = fifo_vnoperate, 190 .vop_access = nfsspec_access, 191 .vop_close = nfsfifo_close, 192 .vop_fsync = nfs_fsync, 193 .vop_getattr = nfs_getattr, 194 .vop_inactive = nfs_inactive, 195 .vop_print = nfs_print, 196 .vop_read = nfsfifo_read, 197 .vop_reclaim = nfs_reclaim, 198 .vop_setattr = nfs_setattr, 199 .vop_write = nfsfifo_write 200 }; 201 202 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 203 struct componentname *cnp, 204 struct vattr *vap); 205 static int nfs_removerpc (struct vnode *dvp, const char *name, 206 int namelen, 207 struct ucred *cred, struct thread *td); 208 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 209 int fnamelen, struct vnode *tdvp, 210 const char *tnameptr, int tnamelen, 211 struct ucred *cred, struct thread *td); 212 static int nfs_renameit (struct vnode *sdvp, 213 struct componentname *scnp, 214 struct sillyrename *sp); 215 216 /* 217 * Global variables 218 */ 219 extern u_int32_t nfs_true, nfs_false; 220 extern u_int32_t nfs_xdrneg1; 221 extern struct nfsstats nfsstats; 222 extern nfstype nfsv3_type[9]; 223 struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; 224 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 225 int nfs_numasync = 0; 226 227 SYSCTL_DECL(_vfs_nfs); 228 229 static int nfsaccess_cache_timeout = NFS_DEFATTRTIMO; 230 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 231 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 232 233 static int nfsneg_cache_timeout = NFS_MINATTRTIMO; 234 SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, 235 &nfsneg_cache_timeout, 0, "NFS NEGATIVE ACCESS cache timeout"); 236 237 static int nfsv3_commit_on_close = 0; 238 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 239 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 240 #if 0 241 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 242 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 243 244 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 245 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 246 #endif 247 248 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 249 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 250 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 251 static int 252 nfs3_access_otw(struct vnode *vp, int wmode, 253 struct thread *td, struct ucred *cred) 254 { 255 const int v3 = 1; 256 u_int32_t *tl; 257 int error = 0, attrflag; 258 259 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 260 caddr_t bpos, dpos, cp2; 261 int32_t t1, t2; 262 caddr_t cp; 263 u_int32_t rmode; 264 struct nfsnode *np = VTONFS(vp); 265 266 nfsstats.rpccnt[NFSPROC_ACCESS]++; 267 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 268 nfsm_fhtom(vp, v3); 269 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 270 *tl = txdr_unsigned(wmode); 271 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 272 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 273 if (!error) { 274 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 275 rmode = fxdr_unsigned(u_int32_t, *tl); 276 np->n_mode = rmode; 277 np->n_modeuid = cred->cr_uid; 278 np->n_modestamp = mycpu->gd_time_seconds; 279 } 280 m_freem(mrep); 281 nfsmout: 282 return error; 283 } 284 285 /* 286 * nfs access vnode op. 287 * For nfs version 2, just return ok. File accesses may fail later. 288 * For nfs version 3, use the access rpc to check accessibility. If file modes 289 * are changed on the server, accesses might still fail later. 290 * 291 * nfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 292 * struct thread *a_td) 293 */ 294 static int 295 nfs_access(struct vop_access_args *ap) 296 { 297 struct vnode *vp = ap->a_vp; 298 thread_t td = curthread; 299 int error = 0; 300 u_int32_t mode, wmode; 301 int v3 = NFS_ISV3(vp); 302 struct nfsnode *np = VTONFS(vp); 303 304 /* 305 * Disallow write attempts on filesystems mounted read-only; 306 * unless the file is a socket, fifo, or a block or character 307 * device resident on the filesystem. 308 */ 309 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 310 switch (vp->v_type) { 311 case VREG: 312 case VDIR: 313 case VLNK: 314 return (EROFS); 315 default: 316 break; 317 } 318 } 319 /* 320 * For nfs v3, check to see if we have done this recently, and if 321 * so return our cached result instead of making an ACCESS call. 322 * If not, do an access rpc, otherwise you are stuck emulating 323 * ufs_access() locally using the vattr. This may not be correct, 324 * since the server may apply other access criteria such as 325 * client uid-->server uid mapping that we do not know about. 326 */ 327 if (v3) { 328 if (ap->a_mode & VREAD) 329 mode = NFSV3ACCESS_READ; 330 else 331 mode = 0; 332 if (vp->v_type != VDIR) { 333 if (ap->a_mode & VWRITE) 334 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 335 if (ap->a_mode & VEXEC) 336 mode |= NFSV3ACCESS_EXECUTE; 337 } else { 338 if (ap->a_mode & VWRITE) 339 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 340 NFSV3ACCESS_DELETE); 341 if (ap->a_mode & VEXEC) 342 mode |= NFSV3ACCESS_LOOKUP; 343 } 344 /* XXX safety belt, only make blanket request if caching */ 345 if (nfsaccess_cache_timeout > 0) { 346 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 347 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 348 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 349 } else { 350 wmode = mode; 351 } 352 353 /* 354 * Does our cached result allow us to give a definite yes to 355 * this request? 356 */ 357 if (np->n_modestamp && 358 (mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && 359 (ap->a_cred->cr_uid == np->n_modeuid) && 360 ((np->n_mode & mode) == mode)) { 361 nfsstats.accesscache_hits++; 362 } else { 363 /* 364 * Either a no, or a don't know. Go to the wire. 365 */ 366 nfsstats.accesscache_misses++; 367 error = nfs3_access_otw(vp, wmode, td, ap->a_cred); 368 if (!error) { 369 if ((np->n_mode & mode) != mode) { 370 error = EACCES; 371 } 372 } 373 } 374 } else { 375 if ((error = nfsspec_access(ap)) != 0) 376 return (error); 377 378 /* 379 * Attempt to prevent a mapped root from accessing a file 380 * which it shouldn't. We try to read a byte from the file 381 * if the user is root and the file is not zero length. 382 * After calling nfsspec_access, we should have the correct 383 * file size cached. 384 */ 385 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 386 && VTONFS(vp)->n_size > 0) { 387 struct iovec aiov; 388 struct uio auio; 389 char buf[1]; 390 391 aiov.iov_base = buf; 392 aiov.iov_len = 1; 393 auio.uio_iov = &aiov; 394 auio.uio_iovcnt = 1; 395 auio.uio_offset = 0; 396 auio.uio_resid = 1; 397 auio.uio_segflg = UIO_SYSSPACE; 398 auio.uio_rw = UIO_READ; 399 auio.uio_td = td; 400 401 if (vp->v_type == VREG) { 402 error = nfs_readrpc(vp, &auio); 403 } else if (vp->v_type == VDIR) { 404 char* bp; 405 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 406 aiov.iov_base = bp; 407 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 408 error = nfs_readdirrpc(vp, &auio); 409 free(bp, M_TEMP); 410 } else if (vp->v_type == VLNK) { 411 error = nfs_readlinkrpc(vp, &auio); 412 } else { 413 error = EACCES; 414 } 415 } 416 } 417 /* 418 * [re]record creds for reading and/or writing if access 419 * was granted. Assume the NFS server will grant read access 420 * for execute requests. 421 */ 422 if (error == 0) { 423 if ((ap->a_mode & (VREAD|VEXEC)) && ap->a_cred != np->n_rucred) { 424 crhold(ap->a_cred); 425 if (np->n_rucred) 426 crfree(np->n_rucred); 427 np->n_rucred = ap->a_cred; 428 } 429 if ((ap->a_mode & VWRITE) && ap->a_cred != np->n_wucred) { 430 crhold(ap->a_cred); 431 if (np->n_wucred) 432 crfree(np->n_wucred); 433 np->n_wucred = ap->a_cred; 434 } 435 } 436 return(error); 437 } 438 439 /* 440 * nfs open vnode op 441 * Check to see if the type is ok 442 * and that deletion is not in progress. 443 * For paged in text files, you will need to flush the page cache 444 * if consistency is lost. 445 * 446 * nfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 447 */ 448 /* ARGSUSED */ 449 static int 450 nfs_open(struct vop_open_args *ap) 451 { 452 struct vnode *vp = ap->a_vp; 453 struct nfsnode *np = VTONFS(vp); 454 struct vattr vattr; 455 int error; 456 457 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 458 #ifdef DIAGNOSTIC 459 printf("open eacces vtyp=%d\n",vp->v_type); 460 #endif 461 return (EOPNOTSUPP); 462 } 463 464 /* 465 * Clear the attribute cache only if opening with write access. It 466 * is unclear if we should do this at all here, but we certainly 467 * should not clear the cache unconditionally simply because a file 468 * is being opened. 469 */ 470 if (ap->a_mode & FWRITE) 471 np->n_attrstamp = 0; 472 473 /* 474 * For normal NFS, reconcile changes made locally verses 475 * changes made remotely. Note that VOP_GETATTR only goes 476 * to the wire if the cached attribute has timed out or been 477 * cleared. 478 * 479 * If local modifications have been made clear the attribute 480 * cache to force an attribute and modified time check. If 481 * GETATTR detects that the file has been changed by someone 482 * other then us it will set NRMODIFIED. 483 * 484 * If we are opening a directory and local changes have been 485 * made we have to invalidate the cache in order to ensure 486 * that we get the most up-to-date information from the 487 * server. XXX 488 */ 489 if (np->n_flag & NLMODIFIED) { 490 np->n_attrstamp = 0; 491 if (vp->v_type == VDIR) { 492 error = nfs_vinvalbuf(vp, V_SAVE, 1); 493 if (error == EINTR) 494 return (error); 495 nfs_invaldir(vp); 496 } 497 } 498 error = VOP_GETATTR(vp, &vattr); 499 if (error) 500 return (error); 501 if (np->n_flag & NRMODIFIED) { 502 if (vp->v_type == VDIR) 503 nfs_invaldir(vp); 504 error = nfs_vinvalbuf(vp, V_SAVE, 1); 505 if (error == EINTR) 506 return (error); 507 np->n_flag &= ~NRMODIFIED; 508 } 509 510 return (vop_stdopen(ap)); 511 } 512 513 /* 514 * nfs close vnode op 515 * What an NFS client should do upon close after writing is a debatable issue. 516 * Most NFS clients push delayed writes to the server upon close, basically for 517 * two reasons: 518 * 1 - So that any write errors may be reported back to the client process 519 * doing the close system call. By far the two most likely errors are 520 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 521 * 2 - To put a worst case upper bound on cache inconsistency between 522 * multiple clients for the file. 523 * There is also a consistency problem for Version 2 of the protocol w.r.t. 524 * not being able to tell if other clients are writing a file concurrently, 525 * since there is no way of knowing if the changed modify time in the reply 526 * is only due to the write for this client. 527 * (NFS Version 3 provides weak cache consistency data in the reply that 528 * should be sufficient to detect and handle this case.) 529 * 530 * The current code does the following: 531 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 532 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 533 * or commit them (this satisfies 1 and 2 except for the 534 * case where the server crashes after this close but 535 * before the commit RPC, which is felt to be "good 536 * enough". Changing the last argument to nfs_flush() to 537 * a 1 would force a commit operation, if it is felt a 538 * commit is necessary now. 539 * for NQNFS - do nothing now, since 2 is dealt with via leases and 540 * 1 should be dealt with via an fsync() system call for 541 * cases where write errors are important. 542 * 543 * nfs_close(struct vnode *a_vp, int a_fflag, 544 * struct ucred *a_cred, struct thread *a_td) 545 */ 546 /* ARGSUSED */ 547 static int 548 nfs_close(struct vop_close_args *ap) 549 { 550 struct vnode *vp = ap->a_vp; 551 struct nfsnode *np = VTONFS(vp); 552 int error = 0; 553 thread_t td = curthread; 554 555 if (vp->v_type == VREG) { 556 if (np->n_flag & NLMODIFIED) { 557 if (NFS_ISV3(vp)) { 558 /* 559 * Under NFSv3 we have dirty buffers to dispose of. We 560 * must flush them to the NFS server. We have the option 561 * of waiting all the way through the commit rpc or just 562 * waiting for the initial write. The default is to only 563 * wait through the initial write so the data is in the 564 * server's cache, which is roughly similar to the state 565 * a standard disk subsystem leaves the file in on close(). 566 * 567 * We cannot clear the NLMODIFIED bit in np->n_flag due to 568 * potential races with other processes, and certainly 569 * cannot clear it if we don't commit. 570 */ 571 int cm = nfsv3_commit_on_close ? 1 : 0; 572 error = nfs_flush(vp, MNT_WAIT, td, cm); 573 /* np->n_flag &= ~NLMODIFIED; */ 574 } else { 575 error = nfs_vinvalbuf(vp, V_SAVE, 1); 576 } 577 np->n_attrstamp = 0; 578 } 579 if (np->n_flag & NWRITEERR) { 580 np->n_flag &= ~NWRITEERR; 581 error = np->n_error; 582 } 583 } 584 vop_stdclose(ap); 585 return (error); 586 } 587 588 /* 589 * nfs getattr call from vfs. 590 * 591 * nfs_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred, 592 * struct thread *a_td) 593 */ 594 static int 595 nfs_getattr(struct vop_getattr_args *ap) 596 { 597 struct vnode *vp = ap->a_vp; 598 struct nfsnode *np = VTONFS(vp); 599 caddr_t cp; 600 u_int32_t *tl; 601 int32_t t1, t2; 602 caddr_t bpos, dpos; 603 int error = 0; 604 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 605 int v3 = NFS_ISV3(vp); 606 thread_t td = curthread; 607 608 /* 609 * Update local times for special files. 610 */ 611 if (np->n_flag & (NACC | NUPD)) 612 np->n_flag |= NCHG; 613 /* 614 * First look in the cache. 615 */ 616 if (nfs_getattrcache(vp, ap->a_vap) == 0) 617 return (0); 618 619 if (v3 && nfsaccess_cache_timeout > 0) { 620 nfsstats.accesscache_misses++; 621 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, nfs_vpcred(vp, ND_CHECK)); 622 if (nfs_getattrcache(vp, ap->a_vap) == 0) 623 return (0); 624 } 625 626 nfsstats.rpccnt[NFSPROC_GETATTR]++; 627 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 628 nfsm_fhtom(vp, v3); 629 nfsm_request(vp, NFSPROC_GETATTR, td, nfs_vpcred(vp, ND_CHECK)); 630 if (!error) { 631 nfsm_loadattr(vp, ap->a_vap); 632 } 633 m_freem(mrep); 634 nfsmout: 635 return (error); 636 } 637 638 /* 639 * nfs setattr call. 640 * 641 * nfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred) 642 */ 643 static int 644 nfs_setattr(struct vop_setattr_args *ap) 645 { 646 struct vnode *vp = ap->a_vp; 647 struct nfsnode *np = VTONFS(vp); 648 struct vattr *vap = ap->a_vap; 649 int error = 0; 650 u_quad_t tsize; 651 thread_t td = curthread; 652 653 #ifndef nolint 654 tsize = (u_quad_t)0; 655 #endif 656 657 /* 658 * Setting of flags is not supported. 659 */ 660 if (vap->va_flags != VNOVAL) 661 return (EOPNOTSUPP); 662 663 /* 664 * Disallow write attempts if the filesystem is mounted read-only. 665 */ 666 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 667 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 668 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 669 (vp->v_mount->mnt_flag & MNT_RDONLY)) 670 return (EROFS); 671 if (vap->va_size != VNOVAL) { 672 switch (vp->v_type) { 673 case VDIR: 674 return (EISDIR); 675 case VCHR: 676 case VBLK: 677 case VSOCK: 678 case VFIFO: 679 if (vap->va_mtime.tv_sec == VNOVAL && 680 vap->va_atime.tv_sec == VNOVAL && 681 vap->va_mode == (mode_t)VNOVAL && 682 vap->va_uid == (uid_t)VNOVAL && 683 vap->va_gid == (gid_t)VNOVAL) 684 return (0); 685 vap->va_size = VNOVAL; 686 break; 687 default: 688 /* 689 * Disallow write attempts if the filesystem is 690 * mounted read-only. 691 */ 692 if (vp->v_mount->mnt_flag & MNT_RDONLY) 693 return (EROFS); 694 695 /* 696 * This is nasty. The RPCs we send to flush pending 697 * data often return attribute information which is 698 * cached via a callback to nfs_loadattrcache(), which 699 * has the effect of changing our notion of the file 700 * size. Due to flushed appends and other operations 701 * the file size can be set to virtually anything, 702 * including values that do not match either the old 703 * or intended file size. 704 * 705 * When this condition is detected we must loop to 706 * try the operation again. Hopefully no more 707 * flushing is required on the loop so it works the 708 * second time around. THIS CASE ALMOST ALWAYS 709 * HAPPENS! 710 */ 711 tsize = np->n_size; 712 again: 713 error = nfs_meta_setsize(vp, td, vap->va_size); 714 715 if (np->n_flag & NLMODIFIED) { 716 if (vap->va_size == 0) 717 error = nfs_vinvalbuf(vp, 0, 1); 718 else 719 error = nfs_vinvalbuf(vp, V_SAVE, 1); 720 } 721 /* 722 * note: this loop case almost always happens at 723 * least once per truncation. 724 */ 725 if (error == 0 && np->n_size != vap->va_size) 726 goto again; 727 np->n_vattr.va_size = vap->va_size; 728 break; 729 } 730 } else if ((vap->va_mtime.tv_sec != VNOVAL || 731 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NLMODIFIED) && 732 vp->v_type == VREG && 733 (error = nfs_vinvalbuf(vp, V_SAVE, 1)) == EINTR 734 ) { 735 return (error); 736 } 737 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 738 739 /* 740 * Sanity check if a truncation was issued. This should only occur 741 * if multiple processes are racing on the same file. 742 */ 743 if (error == 0 && vap->va_size != VNOVAL && 744 np->n_size != vap->va_size) { 745 printf("NFS ftruncate: server disagrees on the file size: %lld/%lld/%lld\n", tsize, vap->va_size, np->n_size); 746 goto again; 747 } 748 if (error && vap->va_size != VNOVAL) { 749 np->n_size = np->n_vattr.va_size = tsize; 750 vnode_pager_setsize(vp, np->n_size); 751 } 752 return (error); 753 } 754 755 /* 756 * Do an nfs setattr rpc. 757 */ 758 static int 759 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 760 struct ucred *cred, struct thread *td) 761 { 762 struct nfsv2_sattr *sp; 763 struct nfsnode *np = VTONFS(vp); 764 caddr_t cp; 765 int32_t t1, t2; 766 caddr_t bpos, dpos, cp2; 767 u_int32_t *tl; 768 int error = 0, wccflag = NFSV3_WCCRATTR; 769 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 770 int v3 = NFS_ISV3(vp); 771 772 nfsstats.rpccnt[NFSPROC_SETATTR]++; 773 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 774 nfsm_fhtom(vp, v3); 775 if (v3) { 776 nfsm_v3attrbuild(vap, TRUE); 777 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 778 *tl = nfs_false; 779 } else { 780 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 781 if (vap->va_mode == (mode_t)VNOVAL) 782 sp->sa_mode = nfs_xdrneg1; 783 else 784 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 785 if (vap->va_uid == (uid_t)VNOVAL) 786 sp->sa_uid = nfs_xdrneg1; 787 else 788 sp->sa_uid = txdr_unsigned(vap->va_uid); 789 if (vap->va_gid == (gid_t)VNOVAL) 790 sp->sa_gid = nfs_xdrneg1; 791 else 792 sp->sa_gid = txdr_unsigned(vap->va_gid); 793 sp->sa_size = txdr_unsigned(vap->va_size); 794 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 795 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 796 } 797 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 798 if (v3) { 799 np->n_modestamp = 0; 800 nfsm_wcc_data(vp, wccflag); 801 } else 802 nfsm_loadattr(vp, (struct vattr *)0); 803 m_freem(mrep); 804 nfsmout: 805 return (error); 806 } 807 808 /* 809 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 810 * nfs_lookup() until all remaining new api calls are implemented. 811 * 812 * Resolve a namecache entry. This function is passed a locked ncp and 813 * must call cache_setvp() on it as appropriate to resolve the entry. 814 */ 815 static int 816 nfs_nresolve(struct vop_nresolve_args *ap) 817 { 818 struct thread *td = curthread; 819 struct namecache *ncp; 820 struct ucred *cred; 821 struct nfsnode *np; 822 struct vnode *dvp; 823 struct vnode *nvp; 824 nfsfh_t *fhp; 825 int attrflag; 826 int fhsize; 827 int error; 828 int len; 829 int v3; 830 /******NFSM MACROS********/ 831 struct mbuf *mb, *mrep, *mreq, *mb2, *md; 832 caddr_t bpos, dpos, cp, cp2; 833 u_int32_t *tl; 834 int32_t t1, t2; 835 836 cred = ap->a_cred; 837 ncp = ap->a_ncp; 838 839 KKASSERT(ncp->nc_parent && ncp->nc_parent->nc_vp); 840 dvp = ncp->nc_parent->nc_vp; 841 if ((error = vget(dvp, LK_SHARED)) != 0) 842 return (error); 843 844 nvp = NULL; 845 v3 = NFS_ISV3(dvp); 846 nfsstats.lookupcache_misses++; 847 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 848 len = ncp->nc_nlen; 849 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 850 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 851 nfsm_fhtom(dvp, v3); 852 nfsm_strtom(ncp->nc_name, len, NFS_MAXNAMLEN); 853 nfsm_request(dvp, NFSPROC_LOOKUP, td, ap->a_cred); 854 if (error) { 855 /* 856 * Cache negatve lookups to reduce NFS traffic, but use 857 * a fast timeout. Otherwise use a timeout of 1 tick. 858 * XXX we should add a namecache flag for no-caching 859 * to uncache the negative hit as soon as possible, but 860 * we cannot simply destroy the entry because it is used 861 * as a placeholder by the caller. 862 */ 863 if (error == ENOENT) { 864 int nticks; 865 866 if (nfsneg_cache_timeout) 867 nticks = nfsneg_cache_timeout * hz; 868 else 869 nticks = 1; 870 cache_setvp(ncp, NULL); 871 cache_settimeout(ncp, nticks); 872 } 873 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 874 m_freem(mrep); 875 goto nfsmout; 876 } 877 878 /* 879 * Success, get the file handle, do various checks, and load 880 * post-operation data from the reply packet. Theoretically 881 * we should never be looking up "." so, theoretically, we 882 * should never get the same file handle as our directory. But 883 * we check anyway. XXX 884 * 885 * Note that no timeout is set for the positive cache hit. We 886 * assume, theoretically, that ESTALE returns will be dealt with 887 * properly to handle NFS races and in anycase we cannot depend 888 * on a timeout to deal with NFS open/create/excl issues so instead 889 * of a bad hack here the rest of the NFS client code needs to do 890 * the right thing. 891 */ 892 nfsm_getfh(fhp, fhsize, v3); 893 894 np = VTONFS(dvp); 895 if (NFS_CMPFH(np, fhp, fhsize)) { 896 vref(dvp); 897 nvp = dvp; 898 } else { 899 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 900 if (error) { 901 m_freem(mrep); 902 vput(dvp); 903 return (error); 904 } 905 nvp = NFSTOV(np); 906 } 907 if (v3) { 908 nfsm_postop_attr(nvp, attrflag, NFS_LATTR_NOSHRINK); 909 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 910 } else { 911 nfsm_loadattr(nvp, NULL); 912 } 913 cache_setvp(ncp, nvp); 914 m_freem(mrep); 915 nfsmout: 916 vput(dvp); 917 if (nvp) { 918 if (nvp == dvp) 919 vrele(nvp); 920 else 921 vput(nvp); 922 } 923 return (error); 924 } 925 926 /* 927 * 'cached' nfs directory lookup 928 * 929 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 930 * 931 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 932 * struct componentname *a_cnp) 933 */ 934 static int 935 nfs_lookup(struct vop_old_lookup_args *ap) 936 { 937 struct componentname *cnp = ap->a_cnp; 938 struct vnode *dvp = ap->a_dvp; 939 struct vnode **vpp = ap->a_vpp; 940 int flags = cnp->cn_flags; 941 struct vnode *newvp; 942 u_int32_t *tl; 943 caddr_t cp; 944 int32_t t1, t2; 945 struct nfsmount *nmp; 946 caddr_t bpos, dpos, cp2; 947 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 948 long len; 949 nfsfh_t *fhp; 950 struct nfsnode *np; 951 int lockparent, wantparent, error = 0, attrflag, fhsize; 952 int v3 = NFS_ISV3(dvp); 953 954 /* 955 * Read-only mount check and directory check. 956 */ 957 *vpp = NULLVP; 958 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 959 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 960 return (EROFS); 961 962 if (dvp->v_type != VDIR) 963 return (ENOTDIR); 964 965 /* 966 * Look it up in the cache. Note that ENOENT is only returned if we 967 * previously entered a negative hit (see later on). The additional 968 * nfsneg_cache_timeout check causes previously cached results to 969 * be instantly ignored if the negative caching is turned off. 970 */ 971 lockparent = flags & CNP_LOCKPARENT; 972 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 973 nmp = VFSTONFS(dvp->v_mount); 974 np = VTONFS(dvp); 975 976 /* 977 * Go to the wire. 978 */ 979 error = 0; 980 newvp = NULLVP; 981 nfsstats.lookupcache_misses++; 982 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 983 len = cnp->cn_namelen; 984 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 985 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 986 nfsm_fhtom(dvp, v3); 987 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 988 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 989 if (error) { 990 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 991 m_freem(mrep); 992 goto nfsmout; 993 } 994 nfsm_getfh(fhp, fhsize, v3); 995 996 /* 997 * Handle RENAME case... 998 */ 999 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1000 if (NFS_CMPFH(np, fhp, fhsize)) { 1001 m_freem(mrep); 1002 return (EISDIR); 1003 } 1004 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1005 if (error) { 1006 m_freem(mrep); 1007 return (error); 1008 } 1009 newvp = NFSTOV(np); 1010 if (v3) { 1011 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1012 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1013 } else 1014 nfsm_loadattr(newvp, (struct vattr *)0); 1015 *vpp = newvp; 1016 m_freem(mrep); 1017 if (!lockparent) { 1018 vn_unlock(dvp); 1019 cnp->cn_flags |= CNP_PDIRUNLOCK; 1020 } 1021 return (0); 1022 } 1023 1024 if (flags & CNP_ISDOTDOT) { 1025 vn_unlock(dvp); 1026 cnp->cn_flags |= CNP_PDIRUNLOCK; 1027 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1028 if (error) { 1029 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1030 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1031 return (error); /* NOTE: return error from nget */ 1032 } 1033 newvp = NFSTOV(np); 1034 if (lockparent) { 1035 error = vn_lock(dvp, LK_EXCLUSIVE); 1036 if (error) { 1037 vput(newvp); 1038 return (error); 1039 } 1040 cnp->cn_flags |= CNP_PDIRUNLOCK; 1041 } 1042 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1043 vref(dvp); 1044 newvp = dvp; 1045 } else { 1046 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1047 if (error) { 1048 m_freem(mrep); 1049 return (error); 1050 } 1051 if (!lockparent) { 1052 vn_unlock(dvp); 1053 cnp->cn_flags |= CNP_PDIRUNLOCK; 1054 } 1055 newvp = NFSTOV(np); 1056 } 1057 if (v3) { 1058 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1059 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1060 } else 1061 nfsm_loadattr(newvp, (struct vattr *)0); 1062 #if 0 1063 /* XXX MOVE TO nfs_nremove() */ 1064 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1065 cnp->cn_nameiop != NAMEI_DELETE) { 1066 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1067 } 1068 #endif 1069 *vpp = newvp; 1070 m_freem(mrep); 1071 nfsmout: 1072 if (error) { 1073 if (newvp != NULLVP) { 1074 vrele(newvp); 1075 *vpp = NULLVP; 1076 } 1077 if ((cnp->cn_nameiop == NAMEI_CREATE || 1078 cnp->cn_nameiop == NAMEI_RENAME) && 1079 error == ENOENT) { 1080 if (!lockparent) { 1081 vn_unlock(dvp); 1082 cnp->cn_flags |= CNP_PDIRUNLOCK; 1083 } 1084 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1085 error = EROFS; 1086 else 1087 error = EJUSTRETURN; 1088 } 1089 } 1090 return (error); 1091 } 1092 1093 /* 1094 * nfs read call. 1095 * Just call nfs_bioread() to do the work. 1096 * 1097 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1098 * struct ucred *a_cred) 1099 */ 1100 static int 1101 nfs_read(struct vop_read_args *ap) 1102 { 1103 struct vnode *vp = ap->a_vp; 1104 1105 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1106 switch (vp->v_type) { 1107 case VREG: 1108 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1109 case VDIR: 1110 return (EISDIR); 1111 default: 1112 return EOPNOTSUPP; 1113 } 1114 } 1115 1116 /* 1117 * nfs readlink call 1118 * 1119 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1120 */ 1121 static int 1122 nfs_readlink(struct vop_readlink_args *ap) 1123 { 1124 struct vnode *vp = ap->a_vp; 1125 1126 if (vp->v_type != VLNK) 1127 return (EINVAL); 1128 return (nfs_bioread(vp, ap->a_uio, 0)); 1129 } 1130 1131 /* 1132 * Do a readlink rpc. 1133 * Called by nfs_doio() from below the buffer cache. 1134 */ 1135 int 1136 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1137 { 1138 u_int32_t *tl; 1139 caddr_t cp; 1140 int32_t t1, t2; 1141 caddr_t bpos, dpos, cp2; 1142 int error = 0, len, attrflag; 1143 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1144 int v3 = NFS_ISV3(vp); 1145 1146 nfsstats.rpccnt[NFSPROC_READLINK]++; 1147 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1148 nfsm_fhtom(vp, v3); 1149 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, nfs_vpcred(vp, ND_CHECK)); 1150 if (v3) 1151 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1152 if (!error) { 1153 nfsm_strsiz(len, NFS_MAXPATHLEN); 1154 if (len == NFS_MAXPATHLEN) { 1155 struct nfsnode *np = VTONFS(vp); 1156 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1157 len = np->n_size; 1158 } 1159 nfsm_mtouio(uiop, len); 1160 } 1161 m_freem(mrep); 1162 nfsmout: 1163 return (error); 1164 } 1165 1166 /* 1167 * nfs read rpc call 1168 * Ditto above 1169 */ 1170 int 1171 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1172 { 1173 u_int32_t *tl; 1174 caddr_t cp; 1175 int32_t t1, t2; 1176 caddr_t bpos, dpos, cp2; 1177 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1178 struct nfsmount *nmp; 1179 int error = 0, len, retlen, tsiz, eof, attrflag; 1180 int v3 = NFS_ISV3(vp); 1181 1182 #ifndef nolint 1183 eof = 0; 1184 #endif 1185 nmp = VFSTONFS(vp->v_mount); 1186 tsiz = uiop->uio_resid; 1187 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1188 return (EFBIG); 1189 while (tsiz > 0) { 1190 nfsstats.rpccnt[NFSPROC_READ]++; 1191 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1192 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1193 nfsm_fhtom(vp, v3); 1194 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1195 if (v3) { 1196 txdr_hyper(uiop->uio_offset, tl); 1197 *(tl + 2) = txdr_unsigned(len); 1198 } else { 1199 *tl++ = txdr_unsigned(uiop->uio_offset); 1200 *tl++ = txdr_unsigned(len); 1201 *tl = 0; 1202 } 1203 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 1204 if (v3) { 1205 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1206 if (error) { 1207 m_freem(mrep); 1208 goto nfsmout; 1209 } 1210 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1211 eof = fxdr_unsigned(int, *(tl + 1)); 1212 } else 1213 nfsm_loadattr(vp, (struct vattr *)0); 1214 nfsm_strsiz(retlen, nmp->nm_rsize); 1215 nfsm_mtouio(uiop, retlen); 1216 m_freem(mrep); 1217 tsiz -= retlen; 1218 if (v3) { 1219 if (eof || retlen == 0) { 1220 tsiz = 0; 1221 } 1222 } else if (retlen < len) { 1223 tsiz = 0; 1224 } 1225 } 1226 nfsmout: 1227 return (error); 1228 } 1229 1230 /* 1231 * nfs write call 1232 */ 1233 int 1234 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit) 1235 { 1236 u_int32_t *tl; 1237 caddr_t cp; 1238 int32_t t1, t2, backup; 1239 caddr_t bpos, dpos, cp2; 1240 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1241 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1242 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1243 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1244 1245 #ifndef DIAGNOSTIC 1246 if (uiop->uio_iovcnt != 1) 1247 panic("nfs: writerpc iovcnt > 1"); 1248 #endif 1249 *must_commit = 0; 1250 tsiz = uiop->uio_resid; 1251 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1252 return (EFBIG); 1253 while (tsiz > 0) { 1254 nfsstats.rpccnt[NFSPROC_WRITE]++; 1255 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1256 nfsm_reqhead(vp, NFSPROC_WRITE, 1257 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1258 nfsm_fhtom(vp, v3); 1259 if (v3) { 1260 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1261 txdr_hyper(uiop->uio_offset, tl); 1262 tl += 2; 1263 *tl++ = txdr_unsigned(len); 1264 *tl++ = txdr_unsigned(*iomode); 1265 *tl = txdr_unsigned(len); 1266 } else { 1267 u_int32_t x; 1268 1269 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1270 /* Set both "begin" and "current" to non-garbage. */ 1271 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1272 *tl++ = x; /* "begin offset" */ 1273 *tl++ = x; /* "current offset" */ 1274 x = txdr_unsigned(len); 1275 *tl++ = x; /* total to this offset */ 1276 *tl = x; /* size of this write */ 1277 } 1278 nfsm_uiotom(uiop, len); 1279 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, nfs_vpcred(vp, ND_WRITE)); 1280 if (v3) { 1281 /* 1282 * The write RPC returns a before and after mtime. The 1283 * nfsm_wcc_data() macro checks the before n_mtime 1284 * against the before time and stores the after time 1285 * in the nfsnode's cached vattr and n_mtime field. 1286 * The NRMODIFIED bit will be set if the before 1287 * time did not match the original mtime. 1288 */ 1289 wccflag = NFSV3_WCCCHK; 1290 nfsm_wcc_data(vp, wccflag); 1291 if (!error) { 1292 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1293 + NFSX_V3WRITEVERF); 1294 rlen = fxdr_unsigned(int, *tl++); 1295 if (rlen == 0) { 1296 error = NFSERR_IO; 1297 m_freem(mrep); 1298 break; 1299 } else if (rlen < len) { 1300 backup = len - rlen; 1301 uiop->uio_iov->iov_base -= backup; 1302 uiop->uio_iov->iov_len += backup; 1303 uiop->uio_offset -= backup; 1304 uiop->uio_resid += backup; 1305 len = rlen; 1306 } 1307 commit = fxdr_unsigned(int, *tl++); 1308 1309 /* 1310 * Return the lowest committment level 1311 * obtained by any of the RPCs. 1312 */ 1313 if (committed == NFSV3WRITE_FILESYNC) 1314 committed = commit; 1315 else if (committed == NFSV3WRITE_DATASYNC && 1316 commit == NFSV3WRITE_UNSTABLE) 1317 committed = commit; 1318 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1319 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1320 NFSX_V3WRITEVERF); 1321 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1322 } else if (bcmp((caddr_t)tl, 1323 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1324 *must_commit = 1; 1325 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1326 NFSX_V3WRITEVERF); 1327 } 1328 } 1329 } else { 1330 nfsm_loadattr(vp, (struct vattr *)0); 1331 } 1332 m_freem(mrep); 1333 if (error) 1334 break; 1335 tsiz -= len; 1336 } 1337 nfsmout: 1338 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1339 committed = NFSV3WRITE_FILESYNC; 1340 *iomode = committed; 1341 if (error) 1342 uiop->uio_resid = tsiz; 1343 return (error); 1344 } 1345 1346 /* 1347 * nfs mknod rpc 1348 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1349 * mode set to specify the file type and the size field for rdev. 1350 */ 1351 static int 1352 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1353 struct vattr *vap) 1354 { 1355 struct nfsv2_sattr *sp; 1356 u_int32_t *tl; 1357 caddr_t cp; 1358 int32_t t1, t2; 1359 struct vnode *newvp = (struct vnode *)0; 1360 struct nfsnode *np = (struct nfsnode *)0; 1361 struct vattr vattr; 1362 char *cp2; 1363 caddr_t bpos, dpos; 1364 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1365 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1366 u_int32_t rdev; 1367 int v3 = NFS_ISV3(dvp); 1368 1369 if (vap->va_type == VCHR || vap->va_type == VBLK) 1370 rdev = txdr_unsigned(vap->va_rdev); 1371 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1372 rdev = nfs_xdrneg1; 1373 else { 1374 return (EOPNOTSUPP); 1375 } 1376 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1377 return (error); 1378 } 1379 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1380 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1381 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1382 nfsm_fhtom(dvp, v3); 1383 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1384 if (v3) { 1385 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1386 *tl++ = vtonfsv3_type(vap->va_type); 1387 nfsm_v3attrbuild(vap, FALSE); 1388 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1389 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1390 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1391 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1392 } 1393 } else { 1394 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1395 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1396 sp->sa_uid = nfs_xdrneg1; 1397 sp->sa_gid = nfs_xdrneg1; 1398 sp->sa_size = rdev; 1399 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1400 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1401 } 1402 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1403 if (!error) { 1404 nfsm_mtofh(dvp, newvp, v3, gotvp); 1405 if (!gotvp) { 1406 if (newvp) { 1407 vput(newvp); 1408 newvp = (struct vnode *)0; 1409 } 1410 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1411 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1412 if (!error) 1413 newvp = NFSTOV(np); 1414 } 1415 } 1416 if (v3) 1417 nfsm_wcc_data(dvp, wccflag); 1418 m_freem(mrep); 1419 nfsmout: 1420 if (error) { 1421 if (newvp) 1422 vput(newvp); 1423 } else { 1424 *vpp = newvp; 1425 } 1426 VTONFS(dvp)->n_flag |= NLMODIFIED; 1427 if (!wccflag) 1428 VTONFS(dvp)->n_attrstamp = 0; 1429 return (error); 1430 } 1431 1432 /* 1433 * nfs mknod vop 1434 * just call nfs_mknodrpc() to do the work. 1435 * 1436 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1437 * struct componentname *a_cnp, struct vattr *a_vap) 1438 */ 1439 /* ARGSUSED */ 1440 static int 1441 nfs_mknod(struct vop_old_mknod_args *ap) 1442 { 1443 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1444 } 1445 1446 static u_long create_verf; 1447 /* 1448 * nfs file create call 1449 * 1450 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1451 * struct componentname *a_cnp, struct vattr *a_vap) 1452 */ 1453 static int 1454 nfs_create(struct vop_old_create_args *ap) 1455 { 1456 struct vnode *dvp = ap->a_dvp; 1457 struct vattr *vap = ap->a_vap; 1458 struct componentname *cnp = ap->a_cnp; 1459 struct nfsv2_sattr *sp; 1460 u_int32_t *tl; 1461 caddr_t cp; 1462 int32_t t1, t2; 1463 struct nfsnode *np = (struct nfsnode *)0; 1464 struct vnode *newvp = (struct vnode *)0; 1465 caddr_t bpos, dpos, cp2; 1466 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1467 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1468 struct vattr vattr; 1469 int v3 = NFS_ISV3(dvp); 1470 1471 /* 1472 * Oops, not for me.. 1473 */ 1474 if (vap->va_type == VSOCK) 1475 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1476 1477 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1478 return (error); 1479 } 1480 if (vap->va_vaflags & VA_EXCLUSIVE) 1481 fmode |= O_EXCL; 1482 again: 1483 nfsstats.rpccnt[NFSPROC_CREATE]++; 1484 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1485 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1486 nfsm_fhtom(dvp, v3); 1487 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1488 if (v3) { 1489 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1490 if (fmode & O_EXCL) { 1491 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1492 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1493 #ifdef INET 1494 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1495 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrhead))->sin_addr.s_addr; 1496 else 1497 #endif 1498 *tl++ = create_verf; 1499 *tl = ++create_verf; 1500 } else { 1501 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1502 nfsm_v3attrbuild(vap, FALSE); 1503 } 1504 } else { 1505 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1506 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1507 sp->sa_uid = nfs_xdrneg1; 1508 sp->sa_gid = nfs_xdrneg1; 1509 sp->sa_size = 0; 1510 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1511 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1512 } 1513 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1514 if (!error) { 1515 nfsm_mtofh(dvp, newvp, v3, gotvp); 1516 if (!gotvp) { 1517 if (newvp) { 1518 vput(newvp); 1519 newvp = (struct vnode *)0; 1520 } 1521 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1522 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1523 if (!error) 1524 newvp = NFSTOV(np); 1525 } 1526 } 1527 if (v3) 1528 nfsm_wcc_data(dvp, wccflag); 1529 m_freem(mrep); 1530 nfsmout: 1531 if (error) { 1532 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1533 fmode &= ~O_EXCL; 1534 goto again; 1535 } 1536 if (newvp) 1537 vput(newvp); 1538 } else if (v3 && (fmode & O_EXCL)) { 1539 /* 1540 * We are normally called with only a partially initialized 1541 * VAP. Since the NFSv3 spec says that server may use the 1542 * file attributes to store the verifier, the spec requires 1543 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1544 * in atime, but we can't really assume that all servers will 1545 * so we ensure that our SETATTR sets both atime and mtime. 1546 */ 1547 if (vap->va_mtime.tv_sec == VNOVAL) 1548 vfs_timestamp(&vap->va_mtime); 1549 if (vap->va_atime.tv_sec == VNOVAL) 1550 vap->va_atime = vap->va_mtime; 1551 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1552 } 1553 if (!error) { 1554 /* 1555 * The new np may have enough info for access 1556 * checks, make sure rucred and wucred are 1557 * initialized for read and write rpc's. 1558 */ 1559 np = VTONFS(newvp); 1560 if (np->n_rucred == NULL) 1561 np->n_rucred = crhold(cnp->cn_cred); 1562 if (np->n_wucred == NULL) 1563 np->n_wucred = crhold(cnp->cn_cred); 1564 *ap->a_vpp = newvp; 1565 } 1566 VTONFS(dvp)->n_flag |= NLMODIFIED; 1567 if (!wccflag) 1568 VTONFS(dvp)->n_attrstamp = 0; 1569 return (error); 1570 } 1571 1572 /* 1573 * nfs file remove call 1574 * To try and make nfs semantics closer to ufs semantics, a file that has 1575 * other processes using the vnode is renamed instead of removed and then 1576 * removed later on the last close. 1577 * - If v_usecount > 1 1578 * If a rename is not already in the works 1579 * call nfs_sillyrename() to set it up 1580 * else 1581 * do the remove rpc 1582 * 1583 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1584 * struct componentname *a_cnp) 1585 */ 1586 static int 1587 nfs_remove(struct vop_old_remove_args *ap) 1588 { 1589 struct vnode *vp = ap->a_vp; 1590 struct vnode *dvp = ap->a_dvp; 1591 struct componentname *cnp = ap->a_cnp; 1592 struct nfsnode *np = VTONFS(vp); 1593 int error = 0; 1594 struct vattr vattr; 1595 1596 #ifndef DIAGNOSTIC 1597 if (vp->v_usecount < 1) 1598 panic("nfs_remove: bad v_usecount"); 1599 #endif 1600 if (vp->v_type == VDIR) 1601 error = EPERM; 1602 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1603 VOP_GETATTR(vp, &vattr) == 0 && 1604 vattr.va_nlink > 1)) { 1605 /* 1606 * throw away biocache buffers, mainly to avoid 1607 * unnecessary delayed writes later. 1608 */ 1609 error = nfs_vinvalbuf(vp, 0, 1); 1610 /* Do the rpc */ 1611 if (error != EINTR) 1612 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1613 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1614 /* 1615 * Kludge City: If the first reply to the remove rpc is lost.. 1616 * the reply to the retransmitted request will be ENOENT 1617 * since the file was in fact removed 1618 * Therefore, we cheat and return success. 1619 */ 1620 if (error == ENOENT) 1621 error = 0; 1622 } else if (!np->n_sillyrename) { 1623 error = nfs_sillyrename(dvp, vp, cnp); 1624 } 1625 np->n_attrstamp = 0; 1626 return (error); 1627 } 1628 1629 /* 1630 * nfs file remove rpc called from nfs_inactive 1631 */ 1632 int 1633 nfs_removeit(struct sillyrename *sp) 1634 { 1635 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1636 sp->s_cred, NULL)); 1637 } 1638 1639 /* 1640 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1641 */ 1642 static int 1643 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1644 struct ucred *cred, struct thread *td) 1645 { 1646 u_int32_t *tl; 1647 caddr_t cp; 1648 int32_t t1, t2; 1649 caddr_t bpos, dpos, cp2; 1650 int error = 0, wccflag = NFSV3_WCCRATTR; 1651 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1652 int v3 = NFS_ISV3(dvp); 1653 1654 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1655 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1656 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1657 nfsm_fhtom(dvp, v3); 1658 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1659 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1660 if (v3) 1661 nfsm_wcc_data(dvp, wccflag); 1662 m_freem(mrep); 1663 nfsmout: 1664 VTONFS(dvp)->n_flag |= NLMODIFIED; 1665 if (!wccflag) 1666 VTONFS(dvp)->n_attrstamp = 0; 1667 return (error); 1668 } 1669 1670 /* 1671 * nfs file rename call 1672 * 1673 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1674 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1675 * struct vnode *a_tvp, struct componentname *a_tcnp) 1676 */ 1677 static int 1678 nfs_rename(struct vop_old_rename_args *ap) 1679 { 1680 struct vnode *fvp = ap->a_fvp; 1681 struct vnode *tvp = ap->a_tvp; 1682 struct vnode *fdvp = ap->a_fdvp; 1683 struct vnode *tdvp = ap->a_tdvp; 1684 struct componentname *tcnp = ap->a_tcnp; 1685 struct componentname *fcnp = ap->a_fcnp; 1686 int error; 1687 1688 /* Check for cross-device rename */ 1689 if ((fvp->v_mount != tdvp->v_mount) || 1690 (tvp && (fvp->v_mount != tvp->v_mount))) { 1691 error = EXDEV; 1692 goto out; 1693 } 1694 1695 /* 1696 * We have to flush B_DELWRI data prior to renaming 1697 * the file. If we don't, the delayed-write buffers 1698 * can be flushed out later after the file has gone stale 1699 * under NFSV3. NFSV2 does not have this problem because 1700 * ( as far as I can tell ) it flushes dirty buffers more 1701 * often. 1702 */ 1703 1704 VOP_FSYNC(fvp, MNT_WAIT); 1705 if (tvp) 1706 VOP_FSYNC(tvp, MNT_WAIT); 1707 1708 /* 1709 * If the tvp exists and is in use, sillyrename it before doing the 1710 * rename of the new file over it. 1711 * 1712 * XXX Can't sillyrename a directory. 1713 * 1714 * We do not attempt to do any namecache purges in this old API 1715 * routine. The new API compat functions have access to the actual 1716 * namecache structures and will do it for us. 1717 */ 1718 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1719 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1720 vput(tvp); 1721 tvp = NULL; 1722 } else if (tvp) { 1723 ; 1724 } 1725 1726 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1727 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1728 tcnp->cn_td); 1729 1730 out: 1731 if (tdvp == tvp) 1732 vrele(tdvp); 1733 else 1734 vput(tdvp); 1735 if (tvp) 1736 vput(tvp); 1737 vrele(fdvp); 1738 vrele(fvp); 1739 /* 1740 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1741 */ 1742 if (error == ENOENT) 1743 error = 0; 1744 return (error); 1745 } 1746 1747 /* 1748 * nfs file rename rpc called from nfs_remove() above 1749 */ 1750 static int 1751 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1752 struct sillyrename *sp) 1753 { 1754 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1755 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1756 } 1757 1758 /* 1759 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1760 */ 1761 static int 1762 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1763 struct vnode *tdvp, const char *tnameptr, int tnamelen, 1764 struct ucred *cred, struct thread *td) 1765 { 1766 u_int32_t *tl; 1767 caddr_t cp; 1768 int32_t t1, t2; 1769 caddr_t bpos, dpos, cp2; 1770 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1771 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1772 int v3 = NFS_ISV3(fdvp); 1773 1774 nfsstats.rpccnt[NFSPROC_RENAME]++; 1775 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1776 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1777 nfsm_rndup(tnamelen)); 1778 nfsm_fhtom(fdvp, v3); 1779 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1780 nfsm_fhtom(tdvp, v3); 1781 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1782 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1783 if (v3) { 1784 nfsm_wcc_data(fdvp, fwccflag); 1785 nfsm_wcc_data(tdvp, twccflag); 1786 } 1787 m_freem(mrep); 1788 nfsmout: 1789 VTONFS(fdvp)->n_flag |= NLMODIFIED; 1790 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1791 if (!fwccflag) 1792 VTONFS(fdvp)->n_attrstamp = 0; 1793 if (!twccflag) 1794 VTONFS(tdvp)->n_attrstamp = 0; 1795 return (error); 1796 } 1797 1798 /* 1799 * nfs hard link create call 1800 * 1801 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 1802 * struct componentname *a_cnp) 1803 */ 1804 static int 1805 nfs_link(struct vop_old_link_args *ap) 1806 { 1807 struct vnode *vp = ap->a_vp; 1808 struct vnode *tdvp = ap->a_tdvp; 1809 struct componentname *cnp = ap->a_cnp; 1810 u_int32_t *tl; 1811 caddr_t cp; 1812 int32_t t1, t2; 1813 caddr_t bpos, dpos, cp2; 1814 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1815 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1816 int v3; 1817 1818 if (vp->v_mount != tdvp->v_mount) { 1819 return (EXDEV); 1820 } 1821 1822 /* 1823 * Push all writes to the server, so that the attribute cache 1824 * doesn't get "out of sync" with the server. 1825 * XXX There should be a better way! 1826 */ 1827 VOP_FSYNC(vp, MNT_WAIT); 1828 1829 v3 = NFS_ISV3(vp); 1830 nfsstats.rpccnt[NFSPROC_LINK]++; 1831 nfsm_reqhead(vp, NFSPROC_LINK, 1832 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1833 nfsm_fhtom(vp, v3); 1834 nfsm_fhtom(tdvp, v3); 1835 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1836 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1837 if (v3) { 1838 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1839 nfsm_wcc_data(tdvp, wccflag); 1840 } 1841 m_freem(mrep); 1842 nfsmout: 1843 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1844 if (!attrflag) 1845 VTONFS(vp)->n_attrstamp = 0; 1846 if (!wccflag) 1847 VTONFS(tdvp)->n_attrstamp = 0; 1848 /* 1849 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1850 */ 1851 if (error == EEXIST) 1852 error = 0; 1853 return (error); 1854 } 1855 1856 /* 1857 * nfs symbolic link create call 1858 * 1859 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1860 * struct componentname *a_cnp, struct vattr *a_vap, 1861 * char *a_target) 1862 */ 1863 static int 1864 nfs_symlink(struct vop_old_symlink_args *ap) 1865 { 1866 struct vnode *dvp = ap->a_dvp; 1867 struct vattr *vap = ap->a_vap; 1868 struct componentname *cnp = ap->a_cnp; 1869 struct nfsv2_sattr *sp; 1870 u_int32_t *tl; 1871 caddr_t cp; 1872 int32_t t1, t2; 1873 caddr_t bpos, dpos, cp2; 1874 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1875 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1876 struct vnode *newvp = (struct vnode *)0; 1877 int v3 = NFS_ISV3(dvp); 1878 1879 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1880 slen = strlen(ap->a_target); 1881 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1882 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1883 nfsm_fhtom(dvp, v3); 1884 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1885 if (v3) { 1886 nfsm_v3attrbuild(vap, FALSE); 1887 } 1888 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1889 if (!v3) { 1890 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1891 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1892 sp->sa_uid = nfs_xdrneg1; 1893 sp->sa_gid = nfs_xdrneg1; 1894 sp->sa_size = nfs_xdrneg1; 1895 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1896 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1897 } 1898 1899 /* 1900 * Issue the NFS request and get the rpc response. 1901 * 1902 * Only NFSv3 responses returning an error of 0 actually return 1903 * a file handle that can be converted into newvp without having 1904 * to do an extra lookup rpc. 1905 */ 1906 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1907 if (v3) { 1908 if (error == 0) 1909 nfsm_mtofh(dvp, newvp, v3, gotvp); 1910 nfsm_wcc_data(dvp, wccflag); 1911 } 1912 1913 /* 1914 * out code jumps -> here, mrep is also freed. 1915 */ 1916 1917 m_freem(mrep); 1918 nfsmout: 1919 1920 /* 1921 * If we get an EEXIST error, silently convert it to no-error 1922 * in case of an NFS retry. 1923 */ 1924 if (error == EEXIST) 1925 error = 0; 1926 1927 /* 1928 * If we do not have (or no longer have) an error, and we could 1929 * not extract the newvp from the response due to the request being 1930 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1931 * to obtain a newvp to return. 1932 */ 1933 if (error == 0 && newvp == NULL) { 1934 struct nfsnode *np = NULL; 1935 1936 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1937 cnp->cn_cred, cnp->cn_td, &np); 1938 if (!error) 1939 newvp = NFSTOV(np); 1940 } 1941 if (error) { 1942 if (newvp) 1943 vput(newvp); 1944 } else { 1945 *ap->a_vpp = newvp; 1946 } 1947 VTONFS(dvp)->n_flag |= NLMODIFIED; 1948 if (!wccflag) 1949 VTONFS(dvp)->n_attrstamp = 0; 1950 return (error); 1951 } 1952 1953 /* 1954 * nfs make dir call 1955 * 1956 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 1957 * struct componentname *a_cnp, struct vattr *a_vap) 1958 */ 1959 static int 1960 nfs_mkdir(struct vop_old_mkdir_args *ap) 1961 { 1962 struct vnode *dvp = ap->a_dvp; 1963 struct vattr *vap = ap->a_vap; 1964 struct componentname *cnp = ap->a_cnp; 1965 struct nfsv2_sattr *sp; 1966 u_int32_t *tl; 1967 caddr_t cp; 1968 int32_t t1, t2; 1969 int len; 1970 struct nfsnode *np = (struct nfsnode *)0; 1971 struct vnode *newvp = (struct vnode *)0; 1972 caddr_t bpos, dpos, cp2; 1973 int error = 0, wccflag = NFSV3_WCCRATTR; 1974 int gotvp = 0; 1975 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1976 struct vattr vattr; 1977 int v3 = NFS_ISV3(dvp); 1978 1979 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1980 return (error); 1981 } 1982 len = cnp->cn_namelen; 1983 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1984 nfsm_reqhead(dvp, NFSPROC_MKDIR, 1985 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1986 nfsm_fhtom(dvp, v3); 1987 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1988 if (v3) { 1989 nfsm_v3attrbuild(vap, FALSE); 1990 } else { 1991 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1992 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1993 sp->sa_uid = nfs_xdrneg1; 1994 sp->sa_gid = nfs_xdrneg1; 1995 sp->sa_size = nfs_xdrneg1; 1996 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1997 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1998 } 1999 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 2000 if (!error) 2001 nfsm_mtofh(dvp, newvp, v3, gotvp); 2002 if (v3) 2003 nfsm_wcc_data(dvp, wccflag); 2004 m_freem(mrep); 2005 nfsmout: 2006 VTONFS(dvp)->n_flag |= NLMODIFIED; 2007 if (!wccflag) 2008 VTONFS(dvp)->n_attrstamp = 0; 2009 /* 2010 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2011 * if we can succeed in looking up the directory. 2012 */ 2013 if (error == EEXIST || (!error && !gotvp)) { 2014 if (newvp) { 2015 vrele(newvp); 2016 newvp = (struct vnode *)0; 2017 } 2018 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2019 cnp->cn_td, &np); 2020 if (!error) { 2021 newvp = NFSTOV(np); 2022 if (newvp->v_type != VDIR) 2023 error = EEXIST; 2024 } 2025 } 2026 if (error) { 2027 if (newvp) 2028 vrele(newvp); 2029 } else 2030 *ap->a_vpp = newvp; 2031 return (error); 2032 } 2033 2034 /* 2035 * nfs remove directory call 2036 * 2037 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2038 * struct componentname *a_cnp) 2039 */ 2040 static int 2041 nfs_rmdir(struct vop_old_rmdir_args *ap) 2042 { 2043 struct vnode *vp = ap->a_vp; 2044 struct vnode *dvp = ap->a_dvp; 2045 struct componentname *cnp = ap->a_cnp; 2046 u_int32_t *tl; 2047 caddr_t cp; 2048 int32_t t1, t2; 2049 caddr_t bpos, dpos, cp2; 2050 int error = 0, wccflag = NFSV3_WCCRATTR; 2051 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2052 int v3 = NFS_ISV3(dvp); 2053 2054 if (dvp == vp) 2055 return (EINVAL); 2056 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2057 nfsm_reqhead(dvp, NFSPROC_RMDIR, 2058 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2059 nfsm_fhtom(dvp, v3); 2060 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2061 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2062 if (v3) 2063 nfsm_wcc_data(dvp, wccflag); 2064 m_freem(mrep); 2065 nfsmout: 2066 VTONFS(dvp)->n_flag |= NLMODIFIED; 2067 if (!wccflag) 2068 VTONFS(dvp)->n_attrstamp = 0; 2069 /* 2070 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2071 */ 2072 if (error == ENOENT) 2073 error = 0; 2074 return (error); 2075 } 2076 2077 /* 2078 * nfs readdir call 2079 * 2080 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2081 */ 2082 static int 2083 nfs_readdir(struct vop_readdir_args *ap) 2084 { 2085 struct vnode *vp = ap->a_vp; 2086 struct nfsnode *np = VTONFS(vp); 2087 struct uio *uio = ap->a_uio; 2088 int tresid, error; 2089 struct vattr vattr; 2090 2091 if (vp->v_type != VDIR) 2092 return (EPERM); 2093 2094 /* 2095 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2096 * and then check that is still valid, or if this is an NQNFS mount 2097 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2098 * VOP_GETATTR() does not necessarily go to the wire. 2099 */ 2100 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2101 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2102 if (VOP_GETATTR(vp, &vattr) == 0 && 2103 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2104 ) { 2105 nfsstats.direofcache_hits++; 2106 return (0); 2107 } 2108 } 2109 2110 /* 2111 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2112 * own cache coherency checks so we do not have to. 2113 */ 2114 tresid = uio->uio_resid; 2115 error = nfs_bioread(vp, uio, 0); 2116 2117 if (!error && uio->uio_resid == tresid) 2118 nfsstats.direofcache_misses++; 2119 return (error); 2120 } 2121 2122 /* 2123 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2124 * 2125 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2126 * offset/block and converts the nfs formatted directory entries for userland 2127 * consumption as well as deals with offsets into the middle of blocks. 2128 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2129 * be block-bounded. It must convert to cookies for the actual RPC. 2130 */ 2131 int 2132 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2133 { 2134 int len, left; 2135 struct nfs_dirent *dp = NULL; 2136 u_int32_t *tl; 2137 caddr_t cp; 2138 int32_t t1, t2; 2139 nfsuint64 *cookiep; 2140 caddr_t bpos, dpos, cp2; 2141 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2142 nfsuint64 cookie; 2143 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2144 struct nfsnode *dnp = VTONFS(vp); 2145 u_quad_t fileno; 2146 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2147 int attrflag; 2148 int v3 = NFS_ISV3(vp); 2149 2150 #ifndef DIAGNOSTIC 2151 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2152 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2153 panic("nfs readdirrpc bad uio"); 2154 #endif 2155 2156 /* 2157 * If there is no cookie, assume directory was stale. 2158 */ 2159 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2160 if (cookiep) 2161 cookie = *cookiep; 2162 else 2163 return (NFSERR_BAD_COOKIE); 2164 /* 2165 * Loop around doing readdir rpc's of size nm_readdirsize 2166 * truncated to a multiple of DIRBLKSIZ. 2167 * The stopping criteria is EOF or buffer full. 2168 */ 2169 while (more_dirs && bigenough) { 2170 nfsstats.rpccnt[NFSPROC_READDIR]++; 2171 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2172 NFSX_READDIR(v3)); 2173 nfsm_fhtom(vp, v3); 2174 if (v3) { 2175 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2176 *tl++ = cookie.nfsuquad[0]; 2177 *tl++ = cookie.nfsuquad[1]; 2178 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2179 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2180 } else { 2181 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2182 *tl++ = cookie.nfsuquad[0]; 2183 } 2184 *tl = txdr_unsigned(nmp->nm_readdirsize); 2185 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2186 if (v3) { 2187 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2188 if (!error) { 2189 nfsm_dissect(tl, u_int32_t *, 2190 2 * NFSX_UNSIGNED); 2191 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2192 dnp->n_cookieverf.nfsuquad[1] = *tl; 2193 } else { 2194 m_freem(mrep); 2195 goto nfsmout; 2196 } 2197 } 2198 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2199 more_dirs = fxdr_unsigned(int, *tl); 2200 2201 /* loop thru the dir entries, converting them to std form */ 2202 while (more_dirs && bigenough) { 2203 if (v3) { 2204 nfsm_dissect(tl, u_int32_t *, 2205 3 * NFSX_UNSIGNED); 2206 fileno = fxdr_hyper(tl); 2207 len = fxdr_unsigned(int, *(tl + 2)); 2208 } else { 2209 nfsm_dissect(tl, u_int32_t *, 2210 2 * NFSX_UNSIGNED); 2211 fileno = fxdr_unsigned(u_quad_t, *tl++); 2212 len = fxdr_unsigned(int, *tl); 2213 } 2214 if (len <= 0 || len > NFS_MAXNAMLEN) { 2215 error = EBADRPC; 2216 m_freem(mrep); 2217 goto nfsmout; 2218 } 2219 2220 /* 2221 * len is the number of bytes in the path element 2222 * name, not including the \0 termination. 2223 * 2224 * tlen is the number of bytes w have to reserve for 2225 * the path element name. 2226 */ 2227 tlen = nfsm_rndup(len); 2228 if (tlen == len) 2229 tlen += 4; /* To ensure null termination */ 2230 2231 /* 2232 * If the entry would cross a DIRBLKSIZ boundary, 2233 * extend the previous nfs_dirent to cover the 2234 * remaining space. 2235 */ 2236 left = DIRBLKSIZ - blksiz; 2237 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2238 dp->nfs_reclen += left; 2239 uiop->uio_iov->iov_base += left; 2240 uiop->uio_iov->iov_len -= left; 2241 uiop->uio_offset += left; 2242 uiop->uio_resid -= left; 2243 blksiz = 0; 2244 } 2245 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2246 bigenough = 0; 2247 if (bigenough) { 2248 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2249 dp->nfs_ino = fileno; 2250 dp->nfs_namlen = len; 2251 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2252 dp->nfs_type = DT_UNKNOWN; 2253 blksiz += dp->nfs_reclen; 2254 if (blksiz == DIRBLKSIZ) 2255 blksiz = 0; 2256 uiop->uio_offset += sizeof(struct nfs_dirent); 2257 uiop->uio_resid -= sizeof(struct nfs_dirent); 2258 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2259 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2260 nfsm_mtouio(uiop, len); 2261 2262 /* 2263 * The uiop has advanced by nfs_dirent + len 2264 * but really needs to advance by 2265 * nfs_dirent + tlen 2266 */ 2267 cp = uiop->uio_iov->iov_base; 2268 tlen -= len; 2269 *cp = '\0'; /* null terminate */ 2270 uiop->uio_iov->iov_base += tlen; 2271 uiop->uio_iov->iov_len -= tlen; 2272 uiop->uio_offset += tlen; 2273 uiop->uio_resid -= tlen; 2274 } else { 2275 /* 2276 * NFS strings must be rounded up (nfsm_myouio 2277 * handled that in the bigenough case). 2278 */ 2279 nfsm_adv(nfsm_rndup(len)); 2280 } 2281 if (v3) { 2282 nfsm_dissect(tl, u_int32_t *, 2283 3 * NFSX_UNSIGNED); 2284 } else { 2285 nfsm_dissect(tl, u_int32_t *, 2286 2 * NFSX_UNSIGNED); 2287 } 2288 2289 /* 2290 * If we were able to accomodate the last entry, 2291 * get the cookie for the next one. Otherwise 2292 * hold-over the cookie for the one we were not 2293 * able to accomodate. 2294 */ 2295 if (bigenough) { 2296 cookie.nfsuquad[0] = *tl++; 2297 if (v3) 2298 cookie.nfsuquad[1] = *tl++; 2299 } else if (v3) { 2300 tl += 2; 2301 } else { 2302 tl++; 2303 } 2304 more_dirs = fxdr_unsigned(int, *tl); 2305 } 2306 /* 2307 * If at end of rpc data, get the eof boolean 2308 */ 2309 if (!more_dirs) { 2310 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2311 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2312 } 2313 m_freem(mrep); 2314 } 2315 /* 2316 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2317 * by increasing d_reclen for the last record. 2318 */ 2319 if (blksiz > 0) { 2320 left = DIRBLKSIZ - blksiz; 2321 dp->nfs_reclen += left; 2322 uiop->uio_iov->iov_base += left; 2323 uiop->uio_iov->iov_len -= left; 2324 uiop->uio_offset += left; 2325 uiop->uio_resid -= left; 2326 } 2327 2328 if (bigenough) { 2329 /* 2330 * We hit the end of the directory, update direofoffset. 2331 */ 2332 dnp->n_direofoffset = uiop->uio_offset; 2333 } else { 2334 /* 2335 * There is more to go, insert the link cookie so the 2336 * next block can be read. 2337 */ 2338 if (uiop->uio_resid > 0) 2339 printf("EEK! readdirrpc resid > 0\n"); 2340 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2341 *cookiep = cookie; 2342 } 2343 nfsmout: 2344 return (error); 2345 } 2346 2347 /* 2348 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2349 */ 2350 int 2351 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2352 { 2353 int len, left; 2354 struct nfs_dirent *dp; 2355 u_int32_t *tl; 2356 caddr_t cp; 2357 int32_t t1, t2; 2358 struct vnode *newvp; 2359 nfsuint64 *cookiep; 2360 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2361 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2362 nfsuint64 cookie; 2363 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2364 struct nfsnode *dnp = VTONFS(vp), *np; 2365 nfsfh_t *fhp; 2366 u_quad_t fileno; 2367 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2368 int attrflag, fhsize; 2369 struct namecache *ncp; 2370 struct namecache *dncp; 2371 struct nlcomponent nlc; 2372 2373 #ifndef nolint 2374 dp = NULL; 2375 #endif 2376 #ifndef DIAGNOSTIC 2377 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2378 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2379 panic("nfs readdirplusrpc bad uio"); 2380 #endif 2381 /* 2382 * Obtain the namecache record for the directory so we have something 2383 * to use as a basis for creating the entries. This function will 2384 * return a held (but not locked) ncp. The ncp may be disconnected 2385 * from the tree and cannot be used for upward traversals, and the 2386 * ncp may be unnamed. Note that other unrelated operations may 2387 * cause the ncp to be named at any time. 2388 */ 2389 dncp = cache_fromdvp(vp, NULL, 0); 2390 bzero(&nlc, sizeof(nlc)); 2391 newvp = NULLVP; 2392 2393 /* 2394 * If there is no cookie, assume directory was stale. 2395 */ 2396 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2397 if (cookiep) 2398 cookie = *cookiep; 2399 else 2400 return (NFSERR_BAD_COOKIE); 2401 /* 2402 * Loop around doing readdir rpc's of size nm_readdirsize 2403 * truncated to a multiple of DIRBLKSIZ. 2404 * The stopping criteria is EOF or buffer full. 2405 */ 2406 while (more_dirs && bigenough) { 2407 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2408 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2409 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2410 nfsm_fhtom(vp, 1); 2411 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2412 *tl++ = cookie.nfsuquad[0]; 2413 *tl++ = cookie.nfsuquad[1]; 2414 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2415 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2416 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2417 *tl = txdr_unsigned(nmp->nm_rsize); 2418 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2419 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2420 if (error) { 2421 m_freem(mrep); 2422 goto nfsmout; 2423 } 2424 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2425 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2426 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2427 more_dirs = fxdr_unsigned(int, *tl); 2428 2429 /* loop thru the dir entries, doctoring them to 4bsd form */ 2430 while (more_dirs && bigenough) { 2431 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2432 fileno = fxdr_hyper(tl); 2433 len = fxdr_unsigned(int, *(tl + 2)); 2434 if (len <= 0 || len > NFS_MAXNAMLEN) { 2435 error = EBADRPC; 2436 m_freem(mrep); 2437 goto nfsmout; 2438 } 2439 tlen = nfsm_rndup(len); 2440 if (tlen == len) 2441 tlen += 4; /* To ensure null termination*/ 2442 left = DIRBLKSIZ - blksiz; 2443 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2444 dp->nfs_reclen += left; 2445 uiop->uio_iov->iov_base += left; 2446 uiop->uio_iov->iov_len -= left; 2447 uiop->uio_offset += left; 2448 uiop->uio_resid -= left; 2449 blksiz = 0; 2450 } 2451 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2452 bigenough = 0; 2453 if (bigenough) { 2454 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2455 dp->nfs_ino = fileno; 2456 dp->nfs_namlen = len; 2457 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2458 dp->nfs_type = DT_UNKNOWN; 2459 blksiz += dp->nfs_reclen; 2460 if (blksiz == DIRBLKSIZ) 2461 blksiz = 0; 2462 uiop->uio_offset += sizeof(struct nfs_dirent); 2463 uiop->uio_resid -= sizeof(struct nfs_dirent); 2464 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2465 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2466 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2467 nlc.nlc_namelen = len; 2468 nfsm_mtouio(uiop, len); 2469 cp = uiop->uio_iov->iov_base; 2470 tlen -= len; 2471 *cp = '\0'; 2472 uiop->uio_iov->iov_base += tlen; 2473 uiop->uio_iov->iov_len -= tlen; 2474 uiop->uio_offset += tlen; 2475 uiop->uio_resid -= tlen; 2476 } else 2477 nfsm_adv(nfsm_rndup(len)); 2478 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2479 if (bigenough) { 2480 cookie.nfsuquad[0] = *tl++; 2481 cookie.nfsuquad[1] = *tl++; 2482 } else 2483 tl += 2; 2484 2485 /* 2486 * Since the attributes are before the file handle 2487 * (sigh), we must skip over the attributes and then 2488 * come back and get them. 2489 */ 2490 attrflag = fxdr_unsigned(int, *tl); 2491 if (attrflag) { 2492 dpossav1 = dpos; 2493 mdsav1 = md; 2494 nfsm_adv(NFSX_V3FATTR); 2495 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2496 doit = fxdr_unsigned(int, *tl); 2497 if (doit) { 2498 nfsm_getfh(fhp, fhsize, 1); 2499 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2500 vref(vp); 2501 newvp = vp; 2502 np = dnp; 2503 } else { 2504 error = nfs_nget(vp->v_mount, fhp, 2505 fhsize, &np); 2506 if (error) 2507 doit = 0; 2508 else 2509 newvp = NFSTOV(np); 2510 } 2511 } 2512 if (doit && bigenough) { 2513 dpossav2 = dpos; 2514 dpos = dpossav1; 2515 mdsav2 = md; 2516 md = mdsav1; 2517 nfsm_loadattr(newvp, (struct vattr *)0); 2518 dpos = dpossav2; 2519 md = mdsav2; 2520 dp->nfs_type = 2521 IFTODT(VTTOIF(np->n_vattr.va_type)); 2522 if (dncp) { 2523 printf("NFS/READDIRPLUS, ENTER %*.*s\n", 2524 nlc.nlc_namelen, nlc.nlc_namelen, 2525 nlc.nlc_nameptr); 2526 ncp = cache_nlookup(dncp, &nlc); 2527 cache_setunresolved(ncp); 2528 cache_setvp(ncp, newvp); 2529 cache_put(ncp); 2530 } else { 2531 printf("NFS/READDIRPLUS, UNABLE TO ENTER" 2532 " %*.*s\n", 2533 nlc.nlc_namelen, nlc.nlc_namelen, 2534 nlc.nlc_nameptr); 2535 } 2536 } 2537 } else { 2538 /* Just skip over the file handle */ 2539 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2540 i = fxdr_unsigned(int, *tl); 2541 nfsm_adv(nfsm_rndup(i)); 2542 } 2543 if (newvp != NULLVP) { 2544 if (newvp == vp) 2545 vrele(newvp); 2546 else 2547 vput(newvp); 2548 newvp = NULLVP; 2549 } 2550 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2551 more_dirs = fxdr_unsigned(int, *tl); 2552 } 2553 /* 2554 * If at end of rpc data, get the eof boolean 2555 */ 2556 if (!more_dirs) { 2557 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2558 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2559 } 2560 m_freem(mrep); 2561 } 2562 /* 2563 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2564 * by increasing d_reclen for the last record. 2565 */ 2566 if (blksiz > 0) { 2567 left = DIRBLKSIZ - blksiz; 2568 dp->nfs_reclen += left; 2569 uiop->uio_iov->iov_base += left; 2570 uiop->uio_iov->iov_len -= left; 2571 uiop->uio_offset += left; 2572 uiop->uio_resid -= left; 2573 } 2574 2575 /* 2576 * We are now either at the end of the directory or have filled the 2577 * block. 2578 */ 2579 if (bigenough) 2580 dnp->n_direofoffset = uiop->uio_offset; 2581 else { 2582 if (uiop->uio_resid > 0) 2583 printf("EEK! readdirplusrpc resid > 0\n"); 2584 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2585 *cookiep = cookie; 2586 } 2587 nfsmout: 2588 if (newvp != NULLVP) { 2589 if (newvp == vp) 2590 vrele(newvp); 2591 else 2592 vput(newvp); 2593 newvp = NULLVP; 2594 } 2595 if (dncp) 2596 cache_drop(dncp); 2597 return (error); 2598 } 2599 2600 /* 2601 * Silly rename. To make the NFS filesystem that is stateless look a little 2602 * more like the "ufs" a remove of an active vnode is translated to a rename 2603 * to a funny looking filename that is removed by nfs_inactive on the 2604 * nfsnode. There is the potential for another process on a different client 2605 * to create the same funny name between the nfs_lookitup() fails and the 2606 * nfs_rename() completes, but... 2607 */ 2608 static int 2609 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2610 { 2611 struct sillyrename *sp; 2612 struct nfsnode *np; 2613 int error; 2614 2615 /* 2616 * We previously purged dvp instead of vp. I don't know why, it 2617 * completely destroys performance. We can't do it anyway with the 2618 * new VFS API since we would be breaking the namecache topology. 2619 */ 2620 cache_purge(vp); /* XXX */ 2621 np = VTONFS(vp); 2622 #ifndef DIAGNOSTIC 2623 if (vp->v_type == VDIR) 2624 panic("nfs: sillyrename dir"); 2625 #endif 2626 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2627 M_NFSREQ, M_WAITOK); 2628 sp->s_cred = crdup(cnp->cn_cred); 2629 sp->s_dvp = dvp; 2630 vref(dvp); 2631 2632 /* Fudge together a funny name */ 2633 sp->s_namlen = sprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2634 2635 /* Try lookitups until we get one that isn't there */ 2636 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2637 cnp->cn_td, (struct nfsnode **)0) == 0) { 2638 sp->s_name[4]++; 2639 if (sp->s_name[4] > 'z') { 2640 error = EINVAL; 2641 goto bad; 2642 } 2643 } 2644 error = nfs_renameit(dvp, cnp, sp); 2645 if (error) 2646 goto bad; 2647 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2648 cnp->cn_td, &np); 2649 np->n_sillyrename = sp; 2650 return (0); 2651 bad: 2652 vrele(sp->s_dvp); 2653 crfree(sp->s_cred); 2654 free((caddr_t)sp, M_NFSREQ); 2655 return (error); 2656 } 2657 2658 /* 2659 * Look up a file name and optionally either update the file handle or 2660 * allocate an nfsnode, depending on the value of npp. 2661 * npp == NULL --> just do the lookup 2662 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2663 * handled too 2664 * *npp != NULL --> update the file handle in the vnode 2665 */ 2666 static int 2667 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2668 struct thread *td, struct nfsnode **npp) 2669 { 2670 u_int32_t *tl; 2671 caddr_t cp; 2672 int32_t t1, t2; 2673 struct vnode *newvp = (struct vnode *)0; 2674 struct nfsnode *np, *dnp = VTONFS(dvp); 2675 caddr_t bpos, dpos, cp2; 2676 int error = 0, fhlen, attrflag; 2677 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2678 nfsfh_t *nfhp; 2679 int v3 = NFS_ISV3(dvp); 2680 2681 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2682 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2683 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2684 nfsm_fhtom(dvp, v3); 2685 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2686 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2687 if (npp && !error) { 2688 nfsm_getfh(nfhp, fhlen, v3); 2689 if (*npp) { 2690 np = *npp; 2691 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2692 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2693 np->n_fhp = &np->n_fh; 2694 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2695 np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); 2696 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2697 np->n_fhsize = fhlen; 2698 newvp = NFSTOV(np); 2699 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2700 vref(dvp); 2701 newvp = dvp; 2702 } else { 2703 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2704 if (error) { 2705 m_freem(mrep); 2706 return (error); 2707 } 2708 newvp = NFSTOV(np); 2709 } 2710 if (v3) { 2711 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 2712 if (!attrflag && *npp == NULL) { 2713 m_freem(mrep); 2714 if (newvp == dvp) 2715 vrele(newvp); 2716 else 2717 vput(newvp); 2718 return (ENOENT); 2719 } 2720 } else 2721 nfsm_loadattr(newvp, (struct vattr *)0); 2722 } 2723 m_freem(mrep); 2724 nfsmout: 2725 if (npp && *npp == NULL) { 2726 if (error) { 2727 if (newvp) { 2728 if (newvp == dvp) 2729 vrele(newvp); 2730 else 2731 vput(newvp); 2732 } 2733 } else 2734 *npp = np; 2735 } 2736 return (error); 2737 } 2738 2739 /* 2740 * Nfs Version 3 commit rpc 2741 */ 2742 int 2743 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2744 { 2745 caddr_t cp; 2746 u_int32_t *tl; 2747 int32_t t1, t2; 2748 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2749 caddr_t bpos, dpos, cp2; 2750 int error = 0, wccflag = NFSV3_WCCRATTR; 2751 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2752 2753 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2754 return (0); 2755 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2756 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2757 nfsm_fhtom(vp, 1); 2758 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2759 txdr_hyper(offset, tl); 2760 tl += 2; 2761 *tl = txdr_unsigned(cnt); 2762 nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); 2763 nfsm_wcc_data(vp, wccflag); 2764 if (!error) { 2765 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2766 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2767 NFSX_V3WRITEVERF)) { 2768 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2769 NFSX_V3WRITEVERF); 2770 error = NFSERR_STALEWRITEVERF; 2771 } 2772 } 2773 m_freem(mrep); 2774 nfsmout: 2775 return (error); 2776 } 2777 2778 /* 2779 * Kludge City.. 2780 * - make nfs_bmap() essentially a no-op that does no translation 2781 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2782 * (Maybe I could use the process's page mapping, but I was concerned that 2783 * Kernel Write might not be enabled and also figured copyout() would do 2784 * a lot more work than bcopy() and also it currently happens in the 2785 * context of the swapper process (2). 2786 * 2787 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp, 2788 * off_t *a_doffsetp, int *a_runp, int *a_runb) 2789 */ 2790 static int 2791 nfs_bmap(struct vop_bmap_args *ap) 2792 { 2793 struct vnode *vp = ap->a_vp; 2794 2795 if (ap->a_vpp != NULL) 2796 *ap->a_vpp = vp; 2797 if (ap->a_doffsetp != NULL) 2798 *ap->a_doffsetp = ap->a_loffset; 2799 if (ap->a_runp != NULL) 2800 *ap->a_runp = 0; 2801 if (ap->a_runb != NULL) 2802 *ap->a_runb = 0; 2803 return (0); 2804 } 2805 2806 /* 2807 * Strategy routine. 2808 * 2809 * For async requests when nfsiod(s) are running, queue the request by 2810 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2811 * request. 2812 */ 2813 static int 2814 nfs_strategy(struct vop_strategy_args *ap) 2815 { 2816 struct bio *bio = ap->a_bio; 2817 struct bio *nbio; 2818 struct buf *bp = bio->bio_buf; 2819 struct thread *td; 2820 int error = 0; 2821 2822 KASSERT(bp->b_cmd != BUF_CMD_DONE, 2823 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 2824 KASSERT(BUF_REFCNT(bp) > 0, 2825 ("nfs_strategy: buffer %p not locked", bp)); 2826 2827 if (bp->b_flags & B_ASYNC) 2828 td = NULL; 2829 else 2830 td = curthread; /* XXX */ 2831 2832 /* 2833 * We probably don't need to push an nbio any more since no 2834 * block conversion is required due to the use of 64 bit byte 2835 * offsets, but do it anyway. 2836 */ 2837 nbio = push_bio(bio); 2838 nbio->bio_offset = bio->bio_offset; 2839 2840 /* 2841 * If the op is asynchronous and an i/o daemon is waiting 2842 * queue the request, wake it up and wait for completion 2843 * otherwise just do it ourselves. 2844 */ 2845 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(ap->a_vp, nbio, td)) 2846 error = nfs_doio(ap->a_vp, nbio, td); 2847 return (error); 2848 } 2849 2850 /* 2851 * Mmap a file 2852 * 2853 * NB Currently unsupported. 2854 * 2855 * nfs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred, 2856 * struct thread *a_td) 2857 */ 2858 /* ARGSUSED */ 2859 static int 2860 nfs_mmap(struct vop_mmap_args *ap) 2861 { 2862 return (EINVAL); 2863 } 2864 2865 /* 2866 * fsync vnode op. Just call nfs_flush() with commit == 1. 2867 * 2868 * nfs_fsync(struct vnode *a_vp, struct ucred * a_cred, int a_waitfor, 2869 * struct thread *a_td) 2870 */ 2871 /* ARGSUSED */ 2872 static int 2873 nfs_fsync(struct vop_fsync_args *ap) 2874 { 2875 return (nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1)); 2876 } 2877 2878 /* 2879 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 2880 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 2881 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 2882 * set the buffer contains data that has already been written to the server 2883 * and which now needs a commit RPC. 2884 * 2885 * If commit is 0 we only take one pass and only flush buffers containing new 2886 * dirty data. 2887 * 2888 * If commit is 1 we take two passes, issuing a commit RPC in the second 2889 * pass. 2890 * 2891 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 2892 * to completely flush all pending data. 2893 * 2894 * Note that the RB_SCAN code properly handles the case where the 2895 * callback might block and directly or indirectly (another thread) cause 2896 * the RB tree to change. 2897 */ 2898 2899 #ifndef NFS_COMMITBVECSIZ 2900 #define NFS_COMMITBVECSIZ 16 2901 #endif 2902 2903 struct nfs_flush_info { 2904 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 2905 struct thread *td; 2906 struct vnode *vp; 2907 int waitfor; 2908 int slpflag; 2909 int slptimeo; 2910 int loops; 2911 struct buf *bvary[NFS_COMMITBVECSIZ]; 2912 int bvsize; 2913 off_t beg_off; 2914 off_t end_off; 2915 }; 2916 2917 static int nfs_flush_bp(struct buf *bp, void *data); 2918 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 2919 2920 int 2921 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 2922 { 2923 struct nfsnode *np = VTONFS(vp); 2924 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2925 struct nfs_flush_info info; 2926 int error; 2927 2928 bzero(&info, sizeof(info)); 2929 info.td = td; 2930 info.vp = vp; 2931 info.waitfor = waitfor; 2932 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 2933 info.loops = 0; 2934 2935 do { 2936 /* 2937 * Flush mode 2938 */ 2939 info.mode = NFI_FLUSHNEW; 2940 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2941 nfs_flush_bp, &info); 2942 2943 /* 2944 * Take a second pass if committing and no error occured. 2945 * Clean up any left over collection (whether an error 2946 * occurs or not). 2947 */ 2948 if (commit && error == 0) { 2949 info.mode = NFI_COMMIT; 2950 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2951 nfs_flush_bp, &info); 2952 if (info.bvsize) 2953 error = nfs_flush_docommit(&info, error); 2954 } 2955 2956 /* 2957 * Wait for pending I/O to complete before checking whether 2958 * any further dirty buffers exist. 2959 */ 2960 while (waitfor == MNT_WAIT && vp->v_track_write.bk_active) { 2961 vp->v_track_write.bk_waitflag = 1; 2962 error = tsleep(&vp->v_track_write, 2963 info.slpflag, "nfsfsync", info.slptimeo); 2964 if (error) { 2965 /* 2966 * We have to be able to break out if this 2967 * is an 'intr' mount. 2968 */ 2969 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2970 error = -EINTR; 2971 break; 2972 } 2973 2974 /* 2975 * Since we do not process pending signals, 2976 * once we get a PCATCH our tsleep() will no 2977 * longer sleep, switch to a fixed timeout 2978 * instead. 2979 */ 2980 if (info.slpflag == PCATCH) { 2981 info.slpflag = 0; 2982 info.slptimeo = 2 * hz; 2983 } 2984 error = 0; 2985 } 2986 } 2987 ++info.loops; 2988 /* 2989 * Loop if we are flushing synchronous as well as committing, 2990 * and dirty buffers are still present. Otherwise we might livelock. 2991 */ 2992 } while (waitfor == MNT_WAIT && commit && 2993 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 2994 2995 /* 2996 * The callbacks have to return a negative error to terminate the 2997 * RB scan. 2998 */ 2999 if (error < 0) 3000 error = -error; 3001 3002 /* 3003 * Deal with any error collection 3004 */ 3005 if (np->n_flag & NWRITEERR) { 3006 error = np->n_error; 3007 np->n_flag &= ~NWRITEERR; 3008 } 3009 return (error); 3010 } 3011 3012 3013 static 3014 int 3015 nfs_flush_bp(struct buf *bp, void *data) 3016 { 3017 struct nfs_flush_info *info = data; 3018 off_t toff; 3019 int error; 3020 3021 error = 0; 3022 switch(info->mode) { 3023 case NFI_FLUSHNEW: 3024 crit_enter(); 3025 if (info->loops && info->waitfor == MNT_WAIT) { 3026 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3027 if (error) { 3028 int lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3029 if (info->slpflag & PCATCH) 3030 lkflags |= LK_PCATCH; 3031 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3032 info->slptimeo); 3033 } 3034 } else { 3035 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3036 } 3037 if (error == 0) { 3038 KKASSERT(bp->b_vp == info->vp); 3039 3040 if ((bp->b_flags & B_DELWRI) == 0) 3041 panic("nfs_fsync: not dirty"); 3042 if (bp->b_flags & B_NEEDCOMMIT) { 3043 BUF_UNLOCK(bp); 3044 crit_exit(); 3045 break; 3046 } 3047 bremfree(bp); 3048 3049 bp->b_flags |= B_ASYNC; 3050 crit_exit(); 3051 bwrite(bp); 3052 } else { 3053 crit_exit(); 3054 error = 0; 3055 } 3056 break; 3057 case NFI_COMMIT: 3058 /* 3059 * Only process buffers in need of a commit which we can 3060 * immediately lock. This may prevent a buffer from being 3061 * committed, but the normal flush loop will block on the 3062 * same buffer so we shouldn't get into an endless loop. 3063 */ 3064 crit_enter(); 3065 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3066 (B_DELWRI | B_NEEDCOMMIT) || 3067 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 3068 crit_exit(); 3069 break; 3070 } 3071 3072 KKASSERT(bp->b_vp == info->vp); 3073 bremfree(bp); 3074 3075 /* 3076 * NOTE: storing the bp in the bvary[] basically sets 3077 * it up for a commit operation. 3078 * 3079 * We must call vfs_busy_pages() now so the commit operation 3080 * is interlocked with user modifications to memory mapped 3081 * pages. 3082 * 3083 * Note: to avoid loopback deadlocks, we do not 3084 * assign b_runningbufspace. 3085 */ 3086 bp->b_cmd = BUF_CMD_WRITE; 3087 vfs_busy_pages(bp->b_vp, bp); 3088 info->bvary[info->bvsize] = bp; 3089 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3090 if (info->bvsize == 0 || toff < info->beg_off) 3091 info->beg_off = toff; 3092 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3093 if (info->bvsize == 0 || toff > info->end_off) 3094 info->end_off = toff; 3095 ++info->bvsize; 3096 if (info->bvsize == NFS_COMMITBVECSIZ) { 3097 error = nfs_flush_docommit(info, 0); 3098 KKASSERT(info->bvsize == 0); 3099 } 3100 crit_exit(); 3101 } 3102 return (error); 3103 } 3104 3105 static 3106 int 3107 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3108 { 3109 struct vnode *vp; 3110 struct buf *bp; 3111 off_t bytes; 3112 int retv; 3113 int i; 3114 3115 vp = info->vp; 3116 3117 if (info->bvsize > 0) { 3118 /* 3119 * Commit data on the server, as required. Note that 3120 * nfs_commit will use the vnode's cred for the commit. 3121 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3122 */ 3123 bytes = info->end_off - info->beg_off; 3124 if (bytes > 0x40000000) 3125 bytes = 0x40000000; 3126 if (error) { 3127 retv = -error; 3128 } else { 3129 retv = nfs_commit(vp, info->beg_off, 3130 (int)bytes, info->td); 3131 if (retv == NFSERR_STALEWRITEVERF) 3132 nfs_clearcommit(vp->v_mount); 3133 } 3134 3135 /* 3136 * Now, either mark the blocks I/O done or mark the 3137 * blocks dirty, depending on whether the commit 3138 * succeeded. 3139 */ 3140 for (i = 0; i < info->bvsize; ++i) { 3141 bp = info->bvary[i]; 3142 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3143 if (retv) { 3144 /* 3145 * Error, leave B_DELWRI intact 3146 */ 3147 vfs_unbusy_pages(bp); 3148 bp->b_cmd = BUF_CMD_DONE; 3149 brelse(bp); 3150 } else { 3151 /* 3152 * Success, remove B_DELWRI ( bundirty() ). 3153 * 3154 * b_dirtyoff/b_dirtyend seem to be NFS 3155 * specific. We should probably move that 3156 * into bundirty(). XXX 3157 * 3158 * We are faking an I/O write, we have to 3159 * start the transaction in order to 3160 * immediately biodone() it. 3161 */ 3162 crit_enter(); 3163 bp->b_flags |= B_ASYNC; 3164 bundirty(bp); 3165 bp->b_flags &= ~B_ERROR; 3166 bp->b_dirtyoff = bp->b_dirtyend = 0; 3167 crit_exit(); 3168 biodone(&bp->b_bio1); 3169 } 3170 } 3171 info->bvsize = 0; 3172 } 3173 return (error); 3174 } 3175 3176 /* 3177 * NFS advisory byte-level locks. 3178 * Currently unsupported. 3179 * 3180 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3181 * int a_flags) 3182 */ 3183 static int 3184 nfs_advlock(struct vop_advlock_args *ap) 3185 { 3186 struct nfsnode *np = VTONFS(ap->a_vp); 3187 3188 /* 3189 * The following kludge is to allow diskless support to work 3190 * until a real NFS lockd is implemented. Basically, just pretend 3191 * that this is a local lock. 3192 */ 3193 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3194 } 3195 3196 /* 3197 * Print out the contents of an nfsnode. 3198 * 3199 * nfs_print(struct vnode *a_vp) 3200 */ 3201 static int 3202 nfs_print(struct vop_print_args *ap) 3203 { 3204 struct vnode *vp = ap->a_vp; 3205 struct nfsnode *np = VTONFS(vp); 3206 3207 printf("tag VT_NFS, fileid %ld fsid 0x%x", 3208 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3209 if (vp->v_type == VFIFO) 3210 fifo_printinfo(vp); 3211 printf("\n"); 3212 return (0); 3213 } 3214 3215 /* 3216 * nfs special file access vnode op. 3217 * Essentially just get vattr and then imitate iaccess() since the device is 3218 * local to the client. 3219 * 3220 * nfsspec_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 3221 * struct thread *a_td) 3222 */ 3223 static int 3224 nfsspec_access(struct vop_access_args *ap) 3225 { 3226 struct vattr *vap; 3227 gid_t *gp; 3228 struct ucred *cred = ap->a_cred; 3229 struct vnode *vp = ap->a_vp; 3230 mode_t mode = ap->a_mode; 3231 struct vattr vattr; 3232 int i; 3233 int error; 3234 3235 /* 3236 * Disallow write attempts on filesystems mounted read-only; 3237 * unless the file is a socket, fifo, or a block or character 3238 * device resident on the filesystem. 3239 */ 3240 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3241 switch (vp->v_type) { 3242 case VREG: 3243 case VDIR: 3244 case VLNK: 3245 return (EROFS); 3246 default: 3247 break; 3248 } 3249 } 3250 /* 3251 * If you're the super-user, 3252 * you always get access. 3253 */ 3254 if (cred->cr_uid == 0) 3255 return (0); 3256 vap = &vattr; 3257 error = VOP_GETATTR(vp, vap); 3258 if (error) 3259 return (error); 3260 /* 3261 * Access check is based on only one of owner, group, public. 3262 * If not owner, then check group. If not a member of the 3263 * group, then check public access. 3264 */ 3265 if (cred->cr_uid != vap->va_uid) { 3266 mode >>= 3; 3267 gp = cred->cr_groups; 3268 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3269 if (vap->va_gid == *gp) 3270 goto found; 3271 mode >>= 3; 3272 found: 3273 ; 3274 } 3275 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3276 return (error); 3277 } 3278 3279 /* 3280 * Read wrapper for special devices. 3281 * 3282 * nfsspec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3283 * struct ucred *a_cred) 3284 */ 3285 static int 3286 nfsspec_read(struct vop_read_args *ap) 3287 { 3288 struct nfsnode *np = VTONFS(ap->a_vp); 3289 3290 /* 3291 * Set access flag. 3292 */ 3293 np->n_flag |= NACC; 3294 getnanotime(&np->n_atim); 3295 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3296 } 3297 3298 /* 3299 * Write wrapper for special devices. 3300 * 3301 * nfsspec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3302 * struct ucred *a_cred) 3303 */ 3304 static int 3305 nfsspec_write(struct vop_write_args *ap) 3306 { 3307 struct nfsnode *np = VTONFS(ap->a_vp); 3308 3309 /* 3310 * Set update flag. 3311 */ 3312 np->n_flag |= NUPD; 3313 getnanotime(&np->n_mtim); 3314 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3315 } 3316 3317 /* 3318 * Close wrapper for special devices. 3319 * 3320 * Update the times on the nfsnode then do device close. 3321 * 3322 * nfsspec_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred, 3323 * struct thread *a_td) 3324 */ 3325 static int 3326 nfsspec_close(struct vop_close_args *ap) 3327 { 3328 struct vnode *vp = ap->a_vp; 3329 struct nfsnode *np = VTONFS(vp); 3330 struct vattr vattr; 3331 3332 if (np->n_flag & (NACC | NUPD)) { 3333 np->n_flag |= NCHG; 3334 if (vp->v_usecount == 1 && 3335 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3336 VATTR_NULL(&vattr); 3337 if (np->n_flag & NACC) 3338 vattr.va_atime = np->n_atim; 3339 if (np->n_flag & NUPD) 3340 vattr.va_mtime = np->n_mtim; 3341 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3342 } 3343 } 3344 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3345 } 3346 3347 /* 3348 * Read wrapper for fifos. 3349 * 3350 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3351 * struct ucred *a_cred) 3352 */ 3353 static int 3354 nfsfifo_read(struct vop_read_args *ap) 3355 { 3356 struct nfsnode *np = VTONFS(ap->a_vp); 3357 3358 /* 3359 * Set access flag. 3360 */ 3361 np->n_flag |= NACC; 3362 getnanotime(&np->n_atim); 3363 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3364 } 3365 3366 /* 3367 * Write wrapper for fifos. 3368 * 3369 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3370 * struct ucred *a_cred) 3371 */ 3372 static int 3373 nfsfifo_write(struct vop_write_args *ap) 3374 { 3375 struct nfsnode *np = VTONFS(ap->a_vp); 3376 3377 /* 3378 * Set update flag. 3379 */ 3380 np->n_flag |= NUPD; 3381 getnanotime(&np->n_mtim); 3382 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3383 } 3384 3385 /* 3386 * Close wrapper for fifos. 3387 * 3388 * Update the times on the nfsnode then do fifo close. 3389 * 3390 * nfsfifo_close(struct vnode *a_vp, int a_fflag, struct thread *a_td) 3391 */ 3392 static int 3393 nfsfifo_close(struct vop_close_args *ap) 3394 { 3395 struct vnode *vp = ap->a_vp; 3396 struct nfsnode *np = VTONFS(vp); 3397 struct vattr vattr; 3398 struct timespec ts; 3399 3400 if (np->n_flag & (NACC | NUPD)) { 3401 getnanotime(&ts); 3402 if (np->n_flag & NACC) 3403 np->n_atim = ts; 3404 if (np->n_flag & NUPD) 3405 np->n_mtim = ts; 3406 np->n_flag |= NCHG; 3407 if (vp->v_usecount == 1 && 3408 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3409 VATTR_NULL(&vattr); 3410 if (np->n_flag & NACC) 3411 vattr.va_atime = np->n_atim; 3412 if (np->n_flag & NUPD) 3413 vattr.va_mtime = np->n_mtim; 3414 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3415 } 3416 } 3417 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3418 } 3419 3420