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 1.69 2006/12/23 00:41:29 swildner 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 = kmalloc(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 kfree(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 kprintf("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 kprintf("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_nch->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(ap->a_nch, NULL); 871 cache_settimeout(ap->a_nch, 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(ap->a_nch, 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 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 2095 return (error); 2096 2097 /* 2098 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2099 * and then check that is still valid, or if this is an NQNFS mount 2100 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2101 * VOP_GETATTR() does not necessarily go to the wire. 2102 */ 2103 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2104 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2105 if (VOP_GETATTR(vp, &vattr) == 0 && 2106 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2107 ) { 2108 nfsstats.direofcache_hits++; 2109 goto done; 2110 } 2111 } 2112 2113 /* 2114 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2115 * own cache coherency checks so we do not have to. 2116 */ 2117 tresid = uio->uio_resid; 2118 error = nfs_bioread(vp, uio, 0); 2119 2120 if (!error && uio->uio_resid == tresid) 2121 nfsstats.direofcache_misses++; 2122 done: 2123 vn_unlock(vp); 2124 return (error); 2125 } 2126 2127 /* 2128 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2129 * 2130 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2131 * offset/block and converts the nfs formatted directory entries for userland 2132 * consumption as well as deals with offsets into the middle of blocks. 2133 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2134 * be block-bounded. It must convert to cookies for the actual RPC. 2135 */ 2136 int 2137 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2138 { 2139 int len, left; 2140 struct nfs_dirent *dp = NULL; 2141 u_int32_t *tl; 2142 caddr_t cp; 2143 int32_t t1, t2; 2144 nfsuint64 *cookiep; 2145 caddr_t bpos, dpos, cp2; 2146 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2147 nfsuint64 cookie; 2148 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2149 struct nfsnode *dnp = VTONFS(vp); 2150 u_quad_t fileno; 2151 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2152 int attrflag; 2153 int v3 = NFS_ISV3(vp); 2154 2155 #ifndef DIAGNOSTIC 2156 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2157 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2158 panic("nfs readdirrpc bad uio"); 2159 #endif 2160 2161 /* 2162 * If there is no cookie, assume directory was stale. 2163 */ 2164 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2165 if (cookiep) 2166 cookie = *cookiep; 2167 else 2168 return (NFSERR_BAD_COOKIE); 2169 /* 2170 * Loop around doing readdir rpc's of size nm_readdirsize 2171 * truncated to a multiple of DIRBLKSIZ. 2172 * The stopping criteria is EOF or buffer full. 2173 */ 2174 while (more_dirs && bigenough) { 2175 nfsstats.rpccnt[NFSPROC_READDIR]++; 2176 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2177 NFSX_READDIR(v3)); 2178 nfsm_fhtom(vp, v3); 2179 if (v3) { 2180 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2181 *tl++ = cookie.nfsuquad[0]; 2182 *tl++ = cookie.nfsuquad[1]; 2183 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2184 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2185 } else { 2186 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2187 *tl++ = cookie.nfsuquad[0]; 2188 } 2189 *tl = txdr_unsigned(nmp->nm_readdirsize); 2190 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2191 if (v3) { 2192 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2193 if (!error) { 2194 nfsm_dissect(tl, u_int32_t *, 2195 2 * NFSX_UNSIGNED); 2196 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2197 dnp->n_cookieverf.nfsuquad[1] = *tl; 2198 } else { 2199 m_freem(mrep); 2200 goto nfsmout; 2201 } 2202 } 2203 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2204 more_dirs = fxdr_unsigned(int, *tl); 2205 2206 /* loop thru the dir entries, converting them to std form */ 2207 while (more_dirs && bigenough) { 2208 if (v3) { 2209 nfsm_dissect(tl, u_int32_t *, 2210 3 * NFSX_UNSIGNED); 2211 fileno = fxdr_hyper(tl); 2212 len = fxdr_unsigned(int, *(tl + 2)); 2213 } else { 2214 nfsm_dissect(tl, u_int32_t *, 2215 2 * NFSX_UNSIGNED); 2216 fileno = fxdr_unsigned(u_quad_t, *tl++); 2217 len = fxdr_unsigned(int, *tl); 2218 } 2219 if (len <= 0 || len > NFS_MAXNAMLEN) { 2220 error = EBADRPC; 2221 m_freem(mrep); 2222 goto nfsmout; 2223 } 2224 2225 /* 2226 * len is the number of bytes in the path element 2227 * name, not including the \0 termination. 2228 * 2229 * tlen is the number of bytes w have to reserve for 2230 * the path element name. 2231 */ 2232 tlen = nfsm_rndup(len); 2233 if (tlen == len) 2234 tlen += 4; /* To ensure null termination */ 2235 2236 /* 2237 * If the entry would cross a DIRBLKSIZ boundary, 2238 * extend the previous nfs_dirent to cover the 2239 * remaining space. 2240 */ 2241 left = DIRBLKSIZ - blksiz; 2242 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2243 dp->nfs_reclen += left; 2244 uiop->uio_iov->iov_base += left; 2245 uiop->uio_iov->iov_len -= left; 2246 uiop->uio_offset += left; 2247 uiop->uio_resid -= left; 2248 blksiz = 0; 2249 } 2250 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2251 bigenough = 0; 2252 if (bigenough) { 2253 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2254 dp->nfs_ino = fileno; 2255 dp->nfs_namlen = len; 2256 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2257 dp->nfs_type = DT_UNKNOWN; 2258 blksiz += dp->nfs_reclen; 2259 if (blksiz == DIRBLKSIZ) 2260 blksiz = 0; 2261 uiop->uio_offset += sizeof(struct nfs_dirent); 2262 uiop->uio_resid -= sizeof(struct nfs_dirent); 2263 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2264 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2265 nfsm_mtouio(uiop, len); 2266 2267 /* 2268 * The uiop has advanced by nfs_dirent + len 2269 * but really needs to advance by 2270 * nfs_dirent + tlen 2271 */ 2272 cp = uiop->uio_iov->iov_base; 2273 tlen -= len; 2274 *cp = '\0'; /* null terminate */ 2275 uiop->uio_iov->iov_base += tlen; 2276 uiop->uio_iov->iov_len -= tlen; 2277 uiop->uio_offset += tlen; 2278 uiop->uio_resid -= tlen; 2279 } else { 2280 /* 2281 * NFS strings must be rounded up (nfsm_myouio 2282 * handled that in the bigenough case). 2283 */ 2284 nfsm_adv(nfsm_rndup(len)); 2285 } 2286 if (v3) { 2287 nfsm_dissect(tl, u_int32_t *, 2288 3 * NFSX_UNSIGNED); 2289 } else { 2290 nfsm_dissect(tl, u_int32_t *, 2291 2 * NFSX_UNSIGNED); 2292 } 2293 2294 /* 2295 * If we were able to accomodate the last entry, 2296 * get the cookie for the next one. Otherwise 2297 * hold-over the cookie for the one we were not 2298 * able to accomodate. 2299 */ 2300 if (bigenough) { 2301 cookie.nfsuquad[0] = *tl++; 2302 if (v3) 2303 cookie.nfsuquad[1] = *tl++; 2304 } else if (v3) { 2305 tl += 2; 2306 } else { 2307 tl++; 2308 } 2309 more_dirs = fxdr_unsigned(int, *tl); 2310 } 2311 /* 2312 * If at end of rpc data, get the eof boolean 2313 */ 2314 if (!more_dirs) { 2315 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2316 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2317 } 2318 m_freem(mrep); 2319 } 2320 /* 2321 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2322 * by increasing d_reclen for the last record. 2323 */ 2324 if (blksiz > 0) { 2325 left = DIRBLKSIZ - blksiz; 2326 dp->nfs_reclen += left; 2327 uiop->uio_iov->iov_base += left; 2328 uiop->uio_iov->iov_len -= left; 2329 uiop->uio_offset += left; 2330 uiop->uio_resid -= left; 2331 } 2332 2333 if (bigenough) { 2334 /* 2335 * We hit the end of the directory, update direofoffset. 2336 */ 2337 dnp->n_direofoffset = uiop->uio_offset; 2338 } else { 2339 /* 2340 * There is more to go, insert the link cookie so the 2341 * next block can be read. 2342 */ 2343 if (uiop->uio_resid > 0) 2344 kprintf("EEK! readdirrpc resid > 0\n"); 2345 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2346 *cookiep = cookie; 2347 } 2348 nfsmout: 2349 return (error); 2350 } 2351 2352 /* 2353 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2354 */ 2355 int 2356 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2357 { 2358 int len, left; 2359 struct nfs_dirent *dp; 2360 u_int32_t *tl; 2361 caddr_t cp; 2362 int32_t t1, t2; 2363 struct vnode *newvp; 2364 nfsuint64 *cookiep; 2365 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2366 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2367 nfsuint64 cookie; 2368 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2369 struct nfsnode *dnp = VTONFS(vp), *np; 2370 nfsfh_t *fhp; 2371 u_quad_t fileno; 2372 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2373 int attrflag, fhsize; 2374 struct nchandle nch; 2375 struct nchandle dnch; 2376 struct nlcomponent nlc; 2377 2378 #ifndef nolint 2379 dp = NULL; 2380 #endif 2381 #ifndef DIAGNOSTIC 2382 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2383 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2384 panic("nfs readdirplusrpc bad uio"); 2385 #endif 2386 /* 2387 * Obtain the namecache record for the directory so we have something 2388 * to use as a basis for creating the entries. This function will 2389 * return a held (but not locked) ncp. The ncp may be disconnected 2390 * from the tree and cannot be used for upward traversals, and the 2391 * ncp may be unnamed. Note that other unrelated operations may 2392 * cause the ncp to be named at any time. 2393 */ 2394 cache_fromdvp(vp, NULL, 0, &dnch); 2395 bzero(&nlc, sizeof(nlc)); 2396 newvp = NULLVP; 2397 2398 /* 2399 * If there is no cookie, assume directory was stale. 2400 */ 2401 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2402 if (cookiep) 2403 cookie = *cookiep; 2404 else 2405 return (NFSERR_BAD_COOKIE); 2406 /* 2407 * Loop around doing readdir rpc's of size nm_readdirsize 2408 * truncated to a multiple of DIRBLKSIZ. 2409 * The stopping criteria is EOF or buffer full. 2410 */ 2411 while (more_dirs && bigenough) { 2412 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2413 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2414 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2415 nfsm_fhtom(vp, 1); 2416 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2417 *tl++ = cookie.nfsuquad[0]; 2418 *tl++ = cookie.nfsuquad[1]; 2419 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2420 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2421 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2422 *tl = txdr_unsigned(nmp->nm_rsize); 2423 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2424 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2425 if (error) { 2426 m_freem(mrep); 2427 goto nfsmout; 2428 } 2429 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2430 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2431 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2432 more_dirs = fxdr_unsigned(int, *tl); 2433 2434 /* loop thru the dir entries, doctoring them to 4bsd form */ 2435 while (more_dirs && bigenough) { 2436 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2437 fileno = fxdr_hyper(tl); 2438 len = fxdr_unsigned(int, *(tl + 2)); 2439 if (len <= 0 || len > NFS_MAXNAMLEN) { 2440 error = EBADRPC; 2441 m_freem(mrep); 2442 goto nfsmout; 2443 } 2444 tlen = nfsm_rndup(len); 2445 if (tlen == len) 2446 tlen += 4; /* To ensure null termination*/ 2447 left = DIRBLKSIZ - blksiz; 2448 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2449 dp->nfs_reclen += left; 2450 uiop->uio_iov->iov_base += left; 2451 uiop->uio_iov->iov_len -= left; 2452 uiop->uio_offset += left; 2453 uiop->uio_resid -= left; 2454 blksiz = 0; 2455 } 2456 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2457 bigenough = 0; 2458 if (bigenough) { 2459 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2460 dp->nfs_ino = fileno; 2461 dp->nfs_namlen = len; 2462 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2463 dp->nfs_type = DT_UNKNOWN; 2464 blksiz += dp->nfs_reclen; 2465 if (blksiz == DIRBLKSIZ) 2466 blksiz = 0; 2467 uiop->uio_offset += sizeof(struct nfs_dirent); 2468 uiop->uio_resid -= sizeof(struct nfs_dirent); 2469 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2470 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2471 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2472 nlc.nlc_namelen = len; 2473 nfsm_mtouio(uiop, len); 2474 cp = uiop->uio_iov->iov_base; 2475 tlen -= len; 2476 *cp = '\0'; 2477 uiop->uio_iov->iov_base += tlen; 2478 uiop->uio_iov->iov_len -= tlen; 2479 uiop->uio_offset += tlen; 2480 uiop->uio_resid -= tlen; 2481 } else 2482 nfsm_adv(nfsm_rndup(len)); 2483 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2484 if (bigenough) { 2485 cookie.nfsuquad[0] = *tl++; 2486 cookie.nfsuquad[1] = *tl++; 2487 } else 2488 tl += 2; 2489 2490 /* 2491 * Since the attributes are before the file handle 2492 * (sigh), we must skip over the attributes and then 2493 * come back and get them. 2494 */ 2495 attrflag = fxdr_unsigned(int, *tl); 2496 if (attrflag) { 2497 dpossav1 = dpos; 2498 mdsav1 = md; 2499 nfsm_adv(NFSX_V3FATTR); 2500 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2501 doit = fxdr_unsigned(int, *tl); 2502 if (doit) { 2503 nfsm_getfh(fhp, fhsize, 1); 2504 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2505 vref(vp); 2506 newvp = vp; 2507 np = dnp; 2508 } else { 2509 error = nfs_nget(vp->v_mount, fhp, 2510 fhsize, &np); 2511 if (error) 2512 doit = 0; 2513 else 2514 newvp = NFSTOV(np); 2515 } 2516 } 2517 if (doit && bigenough) { 2518 dpossav2 = dpos; 2519 dpos = dpossav1; 2520 mdsav2 = md; 2521 md = mdsav1; 2522 nfsm_loadattr(newvp, (struct vattr *)0); 2523 dpos = dpossav2; 2524 md = mdsav2; 2525 dp->nfs_type = 2526 IFTODT(VTTOIF(np->n_vattr.va_type)); 2527 if (dnch.ncp) { 2528 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2529 nlc.nlc_namelen, nlc.nlc_namelen, 2530 nlc.nlc_nameptr); 2531 nch = cache_nlookup(&dnch, &nlc); 2532 cache_setunresolved(&nch); 2533 cache_setvp(&nch, newvp); 2534 cache_put(&nch); 2535 } else { 2536 kprintf("NFS/READDIRPLUS, UNABLE TO ENTER" 2537 " %*.*s\n", 2538 nlc.nlc_namelen, nlc.nlc_namelen, 2539 nlc.nlc_nameptr); 2540 } 2541 } 2542 } else { 2543 /* Just skip over the file handle */ 2544 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2545 i = fxdr_unsigned(int, *tl); 2546 nfsm_adv(nfsm_rndup(i)); 2547 } 2548 if (newvp != NULLVP) { 2549 if (newvp == vp) 2550 vrele(newvp); 2551 else 2552 vput(newvp); 2553 newvp = NULLVP; 2554 } 2555 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2556 more_dirs = fxdr_unsigned(int, *tl); 2557 } 2558 /* 2559 * If at end of rpc data, get the eof boolean 2560 */ 2561 if (!more_dirs) { 2562 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2563 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2564 } 2565 m_freem(mrep); 2566 } 2567 /* 2568 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2569 * by increasing d_reclen for the last record. 2570 */ 2571 if (blksiz > 0) { 2572 left = DIRBLKSIZ - blksiz; 2573 dp->nfs_reclen += left; 2574 uiop->uio_iov->iov_base += left; 2575 uiop->uio_iov->iov_len -= left; 2576 uiop->uio_offset += left; 2577 uiop->uio_resid -= left; 2578 } 2579 2580 /* 2581 * We are now either at the end of the directory or have filled the 2582 * block. 2583 */ 2584 if (bigenough) 2585 dnp->n_direofoffset = uiop->uio_offset; 2586 else { 2587 if (uiop->uio_resid > 0) 2588 kprintf("EEK! readdirplusrpc resid > 0\n"); 2589 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2590 *cookiep = cookie; 2591 } 2592 nfsmout: 2593 if (newvp != NULLVP) { 2594 if (newvp == vp) 2595 vrele(newvp); 2596 else 2597 vput(newvp); 2598 newvp = NULLVP; 2599 } 2600 if (dnch.ncp) 2601 cache_drop(&dnch); 2602 return (error); 2603 } 2604 2605 /* 2606 * Silly rename. To make the NFS filesystem that is stateless look a little 2607 * more like the "ufs" a remove of an active vnode is translated to a rename 2608 * to a funny looking filename that is removed by nfs_inactive on the 2609 * nfsnode. There is the potential for another process on a different client 2610 * to create the same funny name between the nfs_lookitup() fails and the 2611 * nfs_rename() completes, but... 2612 */ 2613 static int 2614 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2615 { 2616 struct sillyrename *sp; 2617 struct nfsnode *np; 2618 int error; 2619 2620 /* 2621 * We previously purged dvp instead of vp. I don't know why, it 2622 * completely destroys performance. We can't do it anyway with the 2623 * new VFS API since we would be breaking the namecache topology. 2624 */ 2625 cache_purge(vp); /* XXX */ 2626 np = VTONFS(vp); 2627 #ifndef DIAGNOSTIC 2628 if (vp->v_type == VDIR) 2629 panic("nfs: sillyrename dir"); 2630 #endif 2631 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2632 M_NFSREQ, M_WAITOK); 2633 sp->s_cred = crdup(cnp->cn_cred); 2634 sp->s_dvp = dvp; 2635 vref(dvp); 2636 2637 /* Fudge together a funny name */ 2638 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2639 2640 /* Try lookitups until we get one that isn't there */ 2641 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2642 cnp->cn_td, (struct nfsnode **)0) == 0) { 2643 sp->s_name[4]++; 2644 if (sp->s_name[4] > 'z') { 2645 error = EINVAL; 2646 goto bad; 2647 } 2648 } 2649 error = nfs_renameit(dvp, cnp, sp); 2650 if (error) 2651 goto bad; 2652 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2653 cnp->cn_td, &np); 2654 np->n_sillyrename = sp; 2655 return (0); 2656 bad: 2657 vrele(sp->s_dvp); 2658 crfree(sp->s_cred); 2659 kfree((caddr_t)sp, M_NFSREQ); 2660 return (error); 2661 } 2662 2663 /* 2664 * Look up a file name and optionally either update the file handle or 2665 * allocate an nfsnode, depending on the value of npp. 2666 * npp == NULL --> just do the lookup 2667 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2668 * handled too 2669 * *npp != NULL --> update the file handle in the vnode 2670 */ 2671 static int 2672 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2673 struct thread *td, struct nfsnode **npp) 2674 { 2675 u_int32_t *tl; 2676 caddr_t cp; 2677 int32_t t1, t2; 2678 struct vnode *newvp = (struct vnode *)0; 2679 struct nfsnode *np, *dnp = VTONFS(dvp); 2680 caddr_t bpos, dpos, cp2; 2681 int error = 0, fhlen, attrflag; 2682 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2683 nfsfh_t *nfhp; 2684 int v3 = NFS_ISV3(dvp); 2685 2686 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2687 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2688 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2689 nfsm_fhtom(dvp, v3); 2690 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2691 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2692 if (npp && !error) { 2693 nfsm_getfh(nfhp, fhlen, v3); 2694 if (*npp) { 2695 np = *npp; 2696 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2697 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 2698 np->n_fhp = &np->n_fh; 2699 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2700 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 2701 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2702 np->n_fhsize = fhlen; 2703 newvp = NFSTOV(np); 2704 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2705 vref(dvp); 2706 newvp = dvp; 2707 } else { 2708 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2709 if (error) { 2710 m_freem(mrep); 2711 return (error); 2712 } 2713 newvp = NFSTOV(np); 2714 } 2715 if (v3) { 2716 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 2717 if (!attrflag && *npp == NULL) { 2718 m_freem(mrep); 2719 if (newvp == dvp) 2720 vrele(newvp); 2721 else 2722 vput(newvp); 2723 return (ENOENT); 2724 } 2725 } else 2726 nfsm_loadattr(newvp, (struct vattr *)0); 2727 } 2728 m_freem(mrep); 2729 nfsmout: 2730 if (npp && *npp == NULL) { 2731 if (error) { 2732 if (newvp) { 2733 if (newvp == dvp) 2734 vrele(newvp); 2735 else 2736 vput(newvp); 2737 } 2738 } else 2739 *npp = np; 2740 } 2741 return (error); 2742 } 2743 2744 /* 2745 * Nfs Version 3 commit rpc 2746 */ 2747 int 2748 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2749 { 2750 caddr_t cp; 2751 u_int32_t *tl; 2752 int32_t t1, t2; 2753 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2754 caddr_t bpos, dpos, cp2; 2755 int error = 0, wccflag = NFSV3_WCCRATTR; 2756 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2757 2758 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2759 return (0); 2760 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2761 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2762 nfsm_fhtom(vp, 1); 2763 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2764 txdr_hyper(offset, tl); 2765 tl += 2; 2766 *tl = txdr_unsigned(cnt); 2767 nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); 2768 nfsm_wcc_data(vp, wccflag); 2769 if (!error) { 2770 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2771 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2772 NFSX_V3WRITEVERF)) { 2773 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2774 NFSX_V3WRITEVERF); 2775 error = NFSERR_STALEWRITEVERF; 2776 } 2777 } 2778 m_freem(mrep); 2779 nfsmout: 2780 return (error); 2781 } 2782 2783 /* 2784 * Kludge City.. 2785 * - make nfs_bmap() essentially a no-op that does no translation 2786 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2787 * (Maybe I could use the process's page mapping, but I was concerned that 2788 * Kernel Write might not be enabled and also figured copyout() would do 2789 * a lot more work than bcopy() and also it currently happens in the 2790 * context of the swapper process (2). 2791 * 2792 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp, 2793 * off_t *a_doffsetp, int *a_runp, int *a_runb) 2794 */ 2795 static int 2796 nfs_bmap(struct vop_bmap_args *ap) 2797 { 2798 struct vnode *vp = ap->a_vp; 2799 2800 if (ap->a_vpp != NULL) 2801 *ap->a_vpp = vp; 2802 if (ap->a_doffsetp != NULL) 2803 *ap->a_doffsetp = ap->a_loffset; 2804 if (ap->a_runp != NULL) 2805 *ap->a_runp = 0; 2806 if (ap->a_runb != NULL) 2807 *ap->a_runb = 0; 2808 return (0); 2809 } 2810 2811 /* 2812 * Strategy routine. 2813 * 2814 * For async requests when nfsiod(s) are running, queue the request by 2815 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2816 * request. 2817 */ 2818 static int 2819 nfs_strategy(struct vop_strategy_args *ap) 2820 { 2821 struct bio *bio = ap->a_bio; 2822 struct bio *nbio; 2823 struct buf *bp = bio->bio_buf; 2824 struct thread *td; 2825 int error = 0; 2826 2827 KASSERT(bp->b_cmd != BUF_CMD_DONE, 2828 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 2829 KASSERT(BUF_REFCNT(bp) > 0, 2830 ("nfs_strategy: buffer %p not locked", bp)); 2831 2832 if (bp->b_flags & B_ASYNC) 2833 td = NULL; 2834 else 2835 td = curthread; /* XXX */ 2836 2837 /* 2838 * We probably don't need to push an nbio any more since no 2839 * block conversion is required due to the use of 64 bit byte 2840 * offsets, but do it anyway. 2841 */ 2842 nbio = push_bio(bio); 2843 nbio->bio_offset = bio->bio_offset; 2844 2845 /* 2846 * If the op is asynchronous and an i/o daemon is waiting 2847 * queue the request, wake it up and wait for completion 2848 * otherwise just do it ourselves. 2849 */ 2850 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(ap->a_vp, nbio, td)) 2851 error = nfs_doio(ap->a_vp, nbio, td); 2852 return (error); 2853 } 2854 2855 /* 2856 * Mmap a file 2857 * 2858 * NB Currently unsupported. 2859 * 2860 * nfs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred, 2861 * struct thread *a_td) 2862 */ 2863 /* ARGSUSED */ 2864 static int 2865 nfs_mmap(struct vop_mmap_args *ap) 2866 { 2867 return (EINVAL); 2868 } 2869 2870 /* 2871 * fsync vnode op. Just call nfs_flush() with commit == 1. 2872 * 2873 * nfs_fsync(struct vnode *a_vp, struct ucred * a_cred, int a_waitfor, 2874 * struct thread *a_td) 2875 */ 2876 /* ARGSUSED */ 2877 static int 2878 nfs_fsync(struct vop_fsync_args *ap) 2879 { 2880 return (nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1)); 2881 } 2882 2883 /* 2884 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 2885 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 2886 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 2887 * set the buffer contains data that has already been written to the server 2888 * and which now needs a commit RPC. 2889 * 2890 * If commit is 0 we only take one pass and only flush buffers containing new 2891 * dirty data. 2892 * 2893 * If commit is 1 we take two passes, issuing a commit RPC in the second 2894 * pass. 2895 * 2896 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 2897 * to completely flush all pending data. 2898 * 2899 * Note that the RB_SCAN code properly handles the case where the 2900 * callback might block and directly or indirectly (another thread) cause 2901 * the RB tree to change. 2902 */ 2903 2904 #ifndef NFS_COMMITBVECSIZ 2905 #define NFS_COMMITBVECSIZ 16 2906 #endif 2907 2908 struct nfs_flush_info { 2909 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 2910 struct thread *td; 2911 struct vnode *vp; 2912 int waitfor; 2913 int slpflag; 2914 int slptimeo; 2915 int loops; 2916 struct buf *bvary[NFS_COMMITBVECSIZ]; 2917 int bvsize; 2918 off_t beg_off; 2919 off_t end_off; 2920 }; 2921 2922 static int nfs_flush_bp(struct buf *bp, void *data); 2923 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 2924 2925 int 2926 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 2927 { 2928 struct nfsnode *np = VTONFS(vp); 2929 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2930 struct nfs_flush_info info; 2931 int error; 2932 2933 bzero(&info, sizeof(info)); 2934 info.td = td; 2935 info.vp = vp; 2936 info.waitfor = waitfor; 2937 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 2938 info.loops = 0; 2939 2940 do { 2941 /* 2942 * Flush mode 2943 */ 2944 info.mode = NFI_FLUSHNEW; 2945 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2946 nfs_flush_bp, &info); 2947 2948 /* 2949 * Take a second pass if committing and no error occured. 2950 * Clean up any left over collection (whether an error 2951 * occurs or not). 2952 */ 2953 if (commit && error == 0) { 2954 info.mode = NFI_COMMIT; 2955 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2956 nfs_flush_bp, &info); 2957 if (info.bvsize) 2958 error = nfs_flush_docommit(&info, error); 2959 } 2960 2961 /* 2962 * Wait for pending I/O to complete before checking whether 2963 * any further dirty buffers exist. 2964 */ 2965 while (waitfor == MNT_WAIT && vp->v_track_write.bk_active) { 2966 vp->v_track_write.bk_waitflag = 1; 2967 error = tsleep(&vp->v_track_write, 2968 info.slpflag, "nfsfsync", info.slptimeo); 2969 if (error) { 2970 /* 2971 * We have to be able to break out if this 2972 * is an 'intr' mount. 2973 */ 2974 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2975 error = -EINTR; 2976 break; 2977 } 2978 2979 /* 2980 * Since we do not process pending signals, 2981 * once we get a PCATCH our tsleep() will no 2982 * longer sleep, switch to a fixed timeout 2983 * instead. 2984 */ 2985 if (info.slpflag == PCATCH) { 2986 info.slpflag = 0; 2987 info.slptimeo = 2 * hz; 2988 } 2989 error = 0; 2990 } 2991 } 2992 ++info.loops; 2993 /* 2994 * Loop if we are flushing synchronous as well as committing, 2995 * and dirty buffers are still present. Otherwise we might livelock. 2996 */ 2997 } while (waitfor == MNT_WAIT && commit && 2998 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 2999 3000 /* 3001 * The callbacks have to return a negative error to terminate the 3002 * RB scan. 3003 */ 3004 if (error < 0) 3005 error = -error; 3006 3007 /* 3008 * Deal with any error collection 3009 */ 3010 if (np->n_flag & NWRITEERR) { 3011 error = np->n_error; 3012 np->n_flag &= ~NWRITEERR; 3013 } 3014 return (error); 3015 } 3016 3017 3018 static 3019 int 3020 nfs_flush_bp(struct buf *bp, void *data) 3021 { 3022 struct nfs_flush_info *info = data; 3023 off_t toff; 3024 int error; 3025 3026 error = 0; 3027 switch(info->mode) { 3028 case NFI_FLUSHNEW: 3029 crit_enter(); 3030 if (info->loops && info->waitfor == MNT_WAIT) { 3031 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3032 if (error) { 3033 int lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3034 if (info->slpflag & PCATCH) 3035 lkflags |= LK_PCATCH; 3036 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3037 info->slptimeo); 3038 } 3039 } else { 3040 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3041 } 3042 if (error == 0) { 3043 KKASSERT(bp->b_vp == info->vp); 3044 3045 if ((bp->b_flags & B_DELWRI) == 0) 3046 panic("nfs_fsync: not dirty"); 3047 if (bp->b_flags & B_NEEDCOMMIT) { 3048 BUF_UNLOCK(bp); 3049 crit_exit(); 3050 break; 3051 } 3052 bremfree(bp); 3053 3054 bp->b_flags |= B_ASYNC; 3055 crit_exit(); 3056 bwrite(bp); 3057 } else { 3058 crit_exit(); 3059 error = 0; 3060 } 3061 break; 3062 case NFI_COMMIT: 3063 /* 3064 * Only process buffers in need of a commit which we can 3065 * immediately lock. This may prevent a buffer from being 3066 * committed, but the normal flush loop will block on the 3067 * same buffer so we shouldn't get into an endless loop. 3068 */ 3069 crit_enter(); 3070 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3071 (B_DELWRI | B_NEEDCOMMIT) || 3072 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 3073 crit_exit(); 3074 break; 3075 } 3076 3077 KKASSERT(bp->b_vp == info->vp); 3078 bremfree(bp); 3079 3080 /* 3081 * NOTE: storing the bp in the bvary[] basically sets 3082 * it up for a commit operation. 3083 * 3084 * We must call vfs_busy_pages() now so the commit operation 3085 * is interlocked with user modifications to memory mapped 3086 * pages. 3087 * 3088 * Note: to avoid loopback deadlocks, we do not 3089 * assign b_runningbufspace. 3090 */ 3091 bp->b_cmd = BUF_CMD_WRITE; 3092 vfs_busy_pages(bp->b_vp, bp); 3093 info->bvary[info->bvsize] = bp; 3094 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3095 if (info->bvsize == 0 || toff < info->beg_off) 3096 info->beg_off = toff; 3097 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3098 if (info->bvsize == 0 || toff > info->end_off) 3099 info->end_off = toff; 3100 ++info->bvsize; 3101 if (info->bvsize == NFS_COMMITBVECSIZ) { 3102 error = nfs_flush_docommit(info, 0); 3103 KKASSERT(info->bvsize == 0); 3104 } 3105 crit_exit(); 3106 } 3107 return (error); 3108 } 3109 3110 static 3111 int 3112 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3113 { 3114 struct vnode *vp; 3115 struct buf *bp; 3116 off_t bytes; 3117 int retv; 3118 int i; 3119 3120 vp = info->vp; 3121 3122 if (info->bvsize > 0) { 3123 /* 3124 * Commit data on the server, as required. Note that 3125 * nfs_commit will use the vnode's cred for the commit. 3126 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3127 */ 3128 bytes = info->end_off - info->beg_off; 3129 if (bytes > 0x40000000) 3130 bytes = 0x40000000; 3131 if (error) { 3132 retv = -error; 3133 } else { 3134 retv = nfs_commit(vp, info->beg_off, 3135 (int)bytes, info->td); 3136 if (retv == NFSERR_STALEWRITEVERF) 3137 nfs_clearcommit(vp->v_mount); 3138 } 3139 3140 /* 3141 * Now, either mark the blocks I/O done or mark the 3142 * blocks dirty, depending on whether the commit 3143 * succeeded. 3144 */ 3145 for (i = 0; i < info->bvsize; ++i) { 3146 bp = info->bvary[i]; 3147 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3148 if (retv) { 3149 /* 3150 * Error, leave B_DELWRI intact 3151 */ 3152 vfs_unbusy_pages(bp); 3153 bp->b_cmd = BUF_CMD_DONE; 3154 brelse(bp); 3155 } else { 3156 /* 3157 * Success, remove B_DELWRI ( bundirty() ). 3158 * 3159 * b_dirtyoff/b_dirtyend seem to be NFS 3160 * specific. We should probably move that 3161 * into bundirty(). XXX 3162 * 3163 * We are faking an I/O write, we have to 3164 * start the transaction in order to 3165 * immediately biodone() it. 3166 */ 3167 crit_enter(); 3168 bp->b_flags |= B_ASYNC; 3169 bundirty(bp); 3170 bp->b_flags &= ~B_ERROR; 3171 bp->b_dirtyoff = bp->b_dirtyend = 0; 3172 crit_exit(); 3173 biodone(&bp->b_bio1); 3174 } 3175 } 3176 info->bvsize = 0; 3177 } 3178 return (error); 3179 } 3180 3181 /* 3182 * NFS advisory byte-level locks. 3183 * Currently unsupported. 3184 * 3185 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3186 * int a_flags) 3187 */ 3188 static int 3189 nfs_advlock(struct vop_advlock_args *ap) 3190 { 3191 struct nfsnode *np = VTONFS(ap->a_vp); 3192 3193 /* 3194 * The following kludge is to allow diskless support to work 3195 * until a real NFS lockd is implemented. Basically, just pretend 3196 * that this is a local lock. 3197 */ 3198 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3199 } 3200 3201 /* 3202 * Print out the contents of an nfsnode. 3203 * 3204 * nfs_print(struct vnode *a_vp) 3205 */ 3206 static int 3207 nfs_print(struct vop_print_args *ap) 3208 { 3209 struct vnode *vp = ap->a_vp; 3210 struct nfsnode *np = VTONFS(vp); 3211 3212 kprintf("tag VT_NFS, fileid %ld fsid 0x%x", 3213 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3214 if (vp->v_type == VFIFO) 3215 fifo_printinfo(vp); 3216 kprintf("\n"); 3217 return (0); 3218 } 3219 3220 /* 3221 * nfs special file access vnode op. 3222 * Essentially just get vattr and then imitate iaccess() since the device is 3223 * local to the client. 3224 * 3225 * nfsspec_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 3226 * struct thread *a_td) 3227 */ 3228 static int 3229 nfsspec_access(struct vop_access_args *ap) 3230 { 3231 struct vattr *vap; 3232 gid_t *gp; 3233 struct ucred *cred = ap->a_cred; 3234 struct vnode *vp = ap->a_vp; 3235 mode_t mode = ap->a_mode; 3236 struct vattr vattr; 3237 int i; 3238 int error; 3239 3240 /* 3241 * Disallow write attempts on filesystems mounted read-only; 3242 * unless the file is a socket, fifo, or a block or character 3243 * device resident on the filesystem. 3244 */ 3245 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3246 switch (vp->v_type) { 3247 case VREG: 3248 case VDIR: 3249 case VLNK: 3250 return (EROFS); 3251 default: 3252 break; 3253 } 3254 } 3255 /* 3256 * If you're the super-user, 3257 * you always get access. 3258 */ 3259 if (cred->cr_uid == 0) 3260 return (0); 3261 vap = &vattr; 3262 error = VOP_GETATTR(vp, vap); 3263 if (error) 3264 return (error); 3265 /* 3266 * Access check is based on only one of owner, group, public. 3267 * If not owner, then check group. If not a member of the 3268 * group, then check public access. 3269 */ 3270 if (cred->cr_uid != vap->va_uid) { 3271 mode >>= 3; 3272 gp = cred->cr_groups; 3273 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3274 if (vap->va_gid == *gp) 3275 goto found; 3276 mode >>= 3; 3277 found: 3278 ; 3279 } 3280 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3281 return (error); 3282 } 3283 3284 /* 3285 * Read wrapper for special devices. 3286 * 3287 * nfsspec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3288 * struct ucred *a_cred) 3289 */ 3290 static int 3291 nfsspec_read(struct vop_read_args *ap) 3292 { 3293 struct nfsnode *np = VTONFS(ap->a_vp); 3294 3295 /* 3296 * Set access flag. 3297 */ 3298 np->n_flag |= NACC; 3299 getnanotime(&np->n_atim); 3300 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3301 } 3302 3303 /* 3304 * Write wrapper for special devices. 3305 * 3306 * nfsspec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3307 * struct ucred *a_cred) 3308 */ 3309 static int 3310 nfsspec_write(struct vop_write_args *ap) 3311 { 3312 struct nfsnode *np = VTONFS(ap->a_vp); 3313 3314 /* 3315 * Set update flag. 3316 */ 3317 np->n_flag |= NUPD; 3318 getnanotime(&np->n_mtim); 3319 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3320 } 3321 3322 /* 3323 * Close wrapper for special devices. 3324 * 3325 * Update the times on the nfsnode then do device close. 3326 * 3327 * nfsspec_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred, 3328 * struct thread *a_td) 3329 */ 3330 static int 3331 nfsspec_close(struct vop_close_args *ap) 3332 { 3333 struct vnode *vp = ap->a_vp; 3334 struct nfsnode *np = VTONFS(vp); 3335 struct vattr vattr; 3336 3337 if (np->n_flag & (NACC | NUPD)) { 3338 np->n_flag |= NCHG; 3339 if (vp->v_usecount == 1 && 3340 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3341 VATTR_NULL(&vattr); 3342 if (np->n_flag & NACC) 3343 vattr.va_atime = np->n_atim; 3344 if (np->n_flag & NUPD) 3345 vattr.va_mtime = np->n_mtim; 3346 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3347 } 3348 } 3349 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3350 } 3351 3352 /* 3353 * Read wrapper for fifos. 3354 * 3355 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3356 * struct ucred *a_cred) 3357 */ 3358 static int 3359 nfsfifo_read(struct vop_read_args *ap) 3360 { 3361 struct nfsnode *np = VTONFS(ap->a_vp); 3362 3363 /* 3364 * Set access flag. 3365 */ 3366 np->n_flag |= NACC; 3367 getnanotime(&np->n_atim); 3368 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3369 } 3370 3371 /* 3372 * Write wrapper for fifos. 3373 * 3374 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3375 * struct ucred *a_cred) 3376 */ 3377 static int 3378 nfsfifo_write(struct vop_write_args *ap) 3379 { 3380 struct nfsnode *np = VTONFS(ap->a_vp); 3381 3382 /* 3383 * Set update flag. 3384 */ 3385 np->n_flag |= NUPD; 3386 getnanotime(&np->n_mtim); 3387 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3388 } 3389 3390 /* 3391 * Close wrapper for fifos. 3392 * 3393 * Update the times on the nfsnode then do fifo close. 3394 * 3395 * nfsfifo_close(struct vnode *a_vp, int a_fflag, struct thread *a_td) 3396 */ 3397 static int 3398 nfsfifo_close(struct vop_close_args *ap) 3399 { 3400 struct vnode *vp = ap->a_vp; 3401 struct nfsnode *np = VTONFS(vp); 3402 struct vattr vattr; 3403 struct timespec ts; 3404 3405 if (np->n_flag & (NACC | NUPD)) { 3406 getnanotime(&ts); 3407 if (np->n_flag & NACC) 3408 np->n_atim = ts; 3409 if (np->n_flag & NUPD) 3410 np->n_mtim = ts; 3411 np->n_flag |= NCHG; 3412 if (vp->v_usecount == 1 && 3413 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3414 VATTR_NULL(&vattr); 3415 if (np->n_flag & NACC) 3416 vattr.va_atime = np->n_atim; 3417 if (np->n_flag & NUPD) 3418 vattr.va_mtime = np->n_mtim; 3419 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3420 } 3421 } 3422 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3423 } 3424 3425