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 1.79 2008/07/16 18:20:40 dillon Exp $ 39 */ 40 41 42 /* 43 * vnode op calls for Sun NFS version 2 and 3 44 */ 45 46 #include "opt_inet.h" 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/resourcevar.h> 52 #include <sys/proc.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/nlookup.h> 59 #include <sys/socket.h> 60 #include <sys/vnode.h> 61 #include <sys/dirent.h> 62 #include <sys/fcntl.h> 63 #include <sys/lockf.h> 64 #include <sys/stat.h> 65 #include <sys/sysctl.h> 66 #include <sys/conf.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_zone.h> 71 72 #include <sys/buf2.h> 73 74 #include <vfs/fifofs/fifo.h> 75 #include <vfs/ufs/dir.h> 76 77 #undef DIRBLKSIZ 78 79 #include "rpcv2.h" 80 #include "nfsproto.h" 81 #include "nfs.h" 82 #include "nfsmount.h" 83 #include "nfsnode.h" 84 #include "xdr_subs.h" 85 #include "nfsm_subs.h" 86 87 #include <net/if.h> 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 91 #include <sys/thread2.h> 92 93 /* Defs */ 94 #define TRUE 1 95 #define FALSE 0 96 97 static int nfsspec_read (struct vop_read_args *); 98 static int nfsspec_write (struct vop_write_args *); 99 static int nfsfifo_read (struct vop_read_args *); 100 static int nfsfifo_write (struct vop_write_args *); 101 static int nfsspec_close (struct vop_close_args *); 102 static int nfsfifo_close (struct vop_close_args *); 103 #define nfs_poll vop_nopoll 104 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 105 static int nfs_lookup (struct vop_old_lookup_args *); 106 static int nfs_create (struct vop_old_create_args *); 107 static int nfs_mknod (struct vop_old_mknod_args *); 108 static int nfs_open (struct vop_open_args *); 109 static int nfs_close (struct vop_close_args *); 110 static int nfs_access (struct vop_access_args *); 111 static int nfs_getattr (struct vop_getattr_args *); 112 static int nfs_setattr (struct vop_setattr_args *); 113 static int nfs_read (struct vop_read_args *); 114 static int nfs_mmap (struct vop_mmap_args *); 115 static int nfs_fsync (struct vop_fsync_args *); 116 static int nfs_remove (struct vop_old_remove_args *); 117 static int nfs_link (struct vop_old_link_args *); 118 static int nfs_rename (struct vop_old_rename_args *); 119 static int nfs_mkdir (struct vop_old_mkdir_args *); 120 static int nfs_rmdir (struct vop_old_rmdir_args *); 121 static int nfs_symlink (struct vop_old_symlink_args *); 122 static int nfs_readdir (struct vop_readdir_args *); 123 static int nfs_bmap (struct vop_bmap_args *); 124 static int nfs_strategy (struct vop_strategy_args *); 125 static int nfs_lookitup (struct vnode *, const char *, int, 126 struct ucred *, struct thread *, struct nfsnode **); 127 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 128 static int nfsspec_access (struct vop_access_args *); 129 static int nfs_readlink (struct vop_readlink_args *); 130 static int nfs_print (struct vop_print_args *); 131 static int nfs_advlock (struct vop_advlock_args *); 132 133 static int nfs_nresolve (struct vop_nresolve_args *); 134 /* 135 * Global vfs data structures for nfs 136 */ 137 struct vop_ops nfsv2_vnode_vops = { 138 .vop_default = vop_defaultop, 139 .vop_access = nfs_access, 140 .vop_advlock = nfs_advlock, 141 .vop_bmap = nfs_bmap, 142 .vop_close = nfs_close, 143 .vop_old_create = nfs_create, 144 .vop_fsync = nfs_fsync, 145 .vop_getattr = nfs_getattr, 146 .vop_getpages = nfs_getpages, 147 .vop_putpages = nfs_putpages, 148 .vop_inactive = nfs_inactive, 149 .vop_old_link = nfs_link, 150 .vop_old_lookup = nfs_lookup, 151 .vop_old_mkdir = nfs_mkdir, 152 .vop_old_mknod = nfs_mknod, 153 .vop_mmap = nfs_mmap, 154 .vop_open = nfs_open, 155 .vop_poll = nfs_poll, 156 .vop_print = nfs_print, 157 .vop_read = nfs_read, 158 .vop_readdir = nfs_readdir, 159 .vop_readlink = nfs_readlink, 160 .vop_reclaim = nfs_reclaim, 161 .vop_old_remove = nfs_remove, 162 .vop_old_rename = nfs_rename, 163 .vop_old_rmdir = nfs_rmdir, 164 .vop_setattr = nfs_setattr, 165 .vop_strategy = nfs_strategy, 166 .vop_old_symlink = nfs_symlink, 167 .vop_write = nfs_write, 168 .vop_nresolve = nfs_nresolve 169 }; 170 171 /* 172 * Special device vnode ops 173 */ 174 struct vop_ops nfsv2_spec_vops = { 175 .vop_default = spec_vnoperate, 176 .vop_access = nfsspec_access, 177 .vop_close = nfsspec_close, 178 .vop_fsync = nfs_fsync, 179 .vop_getattr = nfs_getattr, 180 .vop_inactive = nfs_inactive, 181 .vop_print = nfs_print, 182 .vop_read = nfsspec_read, 183 .vop_reclaim = nfs_reclaim, 184 .vop_setattr = nfs_setattr, 185 .vop_write = nfsspec_write 186 }; 187 188 struct vop_ops nfsv2_fifo_vops = { 189 .vop_default = fifo_vnoperate, 190 .vop_access = nfsspec_access, 191 .vop_close = nfsfifo_close, 192 .vop_fsync = nfs_fsync, 193 .vop_getattr = nfs_getattr, 194 .vop_inactive = nfs_inactive, 195 .vop_print = nfs_print, 196 .vop_read = nfsfifo_read, 197 .vop_reclaim = nfs_reclaim, 198 .vop_setattr = nfs_setattr, 199 .vop_write = nfsfifo_write 200 }; 201 202 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 203 struct componentname *cnp, 204 struct vattr *vap); 205 static int nfs_removerpc (struct vnode *dvp, const char *name, 206 int namelen, 207 struct ucred *cred, struct thread *td); 208 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 209 int fnamelen, struct vnode *tdvp, 210 const char *tnameptr, int tnamelen, 211 struct ucred *cred, struct thread *td); 212 static int nfs_renameit (struct vnode *sdvp, 213 struct componentname *scnp, 214 struct sillyrename *sp); 215 216 /* 217 * Global variables 218 */ 219 extern u_int32_t nfs_true, nfs_false; 220 extern u_int32_t nfs_xdrneg1; 221 extern struct nfsstats nfsstats; 222 extern nfstype nfsv3_type[9]; 223 struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; 224 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 225 int nfs_numasync = 0; 226 227 SYSCTL_DECL(_vfs_nfs); 228 229 static int nfs_flush_on_rename = 1; 230 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_rename, CTLFLAG_RW, 231 &nfs_flush_on_rename, 0, "flush fvp prior to rename"); 232 233 static int nfsaccess_cache_timeout = NFS_DEFATTRTIMO; 234 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 235 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 236 237 static int nfsneg_cache_timeout = NFS_MINATTRTIMO; 238 SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, 239 &nfsneg_cache_timeout, 0, "NFS NEGATIVE NAMECACHE timeout"); 240 241 static int nfspos_cache_timeout = NFS_MINATTRTIMO; 242 SYSCTL_INT(_vfs_nfs, OID_AUTO, pos_cache_timeout, CTLFLAG_RW, 243 &nfspos_cache_timeout, 0, "NFS POSITIVE NAMECACHE timeout"); 244 245 static int nfsv3_commit_on_close = 0; 246 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 247 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 248 #if 0 249 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 250 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 251 252 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 253 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 254 #endif 255 256 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 257 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 258 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 259 static int 260 nfs3_access_otw(struct vnode *vp, int wmode, 261 struct thread *td, struct ucred *cred) 262 { 263 const int v3 = 1; 264 u_int32_t *tl; 265 int error = 0, attrflag; 266 267 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 268 caddr_t bpos, dpos, cp2; 269 int32_t t1, t2; 270 caddr_t cp; 271 u_int32_t rmode; 272 struct nfsnode *np = VTONFS(vp); 273 274 nfsstats.rpccnt[NFSPROC_ACCESS]++; 275 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 276 nfsm_fhtom(vp, v3); 277 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 278 *tl = txdr_unsigned(wmode); 279 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 280 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 281 if (!error) { 282 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 283 rmode = fxdr_unsigned(u_int32_t, *tl); 284 np->n_mode = rmode; 285 np->n_modeuid = cred->cr_uid; 286 np->n_modestamp = mycpu->gd_time_seconds; 287 } 288 m_freem(mrep); 289 nfsmout: 290 return error; 291 } 292 293 /* 294 * nfs access vnode op. 295 * For nfs version 2, just return ok. File accesses may fail later. 296 * For nfs version 3, use the access rpc to check accessibility. If file modes 297 * are changed on the server, accesses might still fail later. 298 * 299 * nfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 300 */ 301 static int 302 nfs_access(struct vop_access_args *ap) 303 { 304 struct vnode *vp = ap->a_vp; 305 thread_t td = curthread; 306 int error = 0; 307 u_int32_t mode, wmode; 308 int v3 = NFS_ISV3(vp); 309 struct nfsnode *np = VTONFS(vp); 310 311 /* 312 * Disallow write attempts on filesystems mounted read-only; 313 * unless the file is a socket, fifo, or a block or character 314 * device resident on the filesystem. 315 */ 316 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 317 switch (vp->v_type) { 318 case VREG: 319 case VDIR: 320 case VLNK: 321 return (EROFS); 322 default: 323 break; 324 } 325 } 326 /* 327 * For nfs v3, check to see if we have done this recently, and if 328 * so return our cached result instead of making an ACCESS call. 329 * If not, do an access rpc, otherwise you are stuck emulating 330 * ufs_access() locally using the vattr. This may not be correct, 331 * since the server may apply other access criteria such as 332 * client uid-->server uid mapping that we do not know about. 333 */ 334 if (v3) { 335 if (ap->a_mode & VREAD) 336 mode = NFSV3ACCESS_READ; 337 else 338 mode = 0; 339 if (vp->v_type != VDIR) { 340 if (ap->a_mode & VWRITE) 341 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 342 if (ap->a_mode & VEXEC) 343 mode |= NFSV3ACCESS_EXECUTE; 344 } else { 345 if (ap->a_mode & VWRITE) 346 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 347 NFSV3ACCESS_DELETE); 348 if (ap->a_mode & VEXEC) 349 mode |= NFSV3ACCESS_LOOKUP; 350 } 351 /* XXX safety belt, only make blanket request if caching */ 352 if (nfsaccess_cache_timeout > 0) { 353 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 354 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 355 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 356 } else { 357 wmode = mode; 358 } 359 360 /* 361 * Does our cached result allow us to give a definite yes to 362 * this request? 363 */ 364 if (np->n_modestamp && 365 (mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && 366 (ap->a_cred->cr_uid == np->n_modeuid) && 367 ((np->n_mode & mode) == mode)) { 368 nfsstats.accesscache_hits++; 369 } else { 370 /* 371 * Either a no, or a don't know. Go to the wire. 372 */ 373 nfsstats.accesscache_misses++; 374 error = nfs3_access_otw(vp, wmode, td, ap->a_cred); 375 if (!error) { 376 if ((np->n_mode & mode) != mode) { 377 error = EACCES; 378 } 379 } 380 } 381 } else { 382 if ((error = nfsspec_access(ap)) != 0) 383 return (error); 384 385 /* 386 * Attempt to prevent a mapped root from accessing a file 387 * which it shouldn't. We try to read a byte from the file 388 * if the user is root and the file is not zero length. 389 * After calling nfsspec_access, we should have the correct 390 * file size cached. 391 */ 392 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 393 && VTONFS(vp)->n_size > 0) { 394 struct iovec aiov; 395 struct uio auio; 396 char buf[1]; 397 398 aiov.iov_base = buf; 399 aiov.iov_len = 1; 400 auio.uio_iov = &aiov; 401 auio.uio_iovcnt = 1; 402 auio.uio_offset = 0; 403 auio.uio_resid = 1; 404 auio.uio_segflg = UIO_SYSSPACE; 405 auio.uio_rw = UIO_READ; 406 auio.uio_td = td; 407 408 if (vp->v_type == VREG) { 409 error = nfs_readrpc(vp, &auio); 410 } else if (vp->v_type == VDIR) { 411 char* bp; 412 bp = kmalloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 413 aiov.iov_base = bp; 414 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 415 error = nfs_readdirrpc(vp, &auio); 416 kfree(bp, M_TEMP); 417 } else if (vp->v_type == VLNK) { 418 error = nfs_readlinkrpc(vp, &auio); 419 } else { 420 error = EACCES; 421 } 422 } 423 } 424 /* 425 * [re]record creds for reading and/or writing if access 426 * was granted. Assume the NFS server will grant read access 427 * for execute requests. 428 */ 429 if (error == 0) { 430 if ((ap->a_mode & (VREAD|VEXEC)) && ap->a_cred != np->n_rucred) { 431 crhold(ap->a_cred); 432 if (np->n_rucred) 433 crfree(np->n_rucred); 434 np->n_rucred = ap->a_cred; 435 } 436 if ((ap->a_mode & VWRITE) && ap->a_cred != np->n_wucred) { 437 crhold(ap->a_cred); 438 if (np->n_wucred) 439 crfree(np->n_wucred); 440 np->n_wucred = ap->a_cred; 441 } 442 } 443 return(error); 444 } 445 446 /* 447 * nfs open vnode op 448 * Check to see if the type is ok 449 * and that deletion is not in progress. 450 * For paged in text files, you will need to flush the page cache 451 * if consistency is lost. 452 * 453 * nfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 454 * struct file *a_fp) 455 */ 456 /* ARGSUSED */ 457 static int 458 nfs_open(struct vop_open_args *ap) 459 { 460 struct vnode *vp = ap->a_vp; 461 struct nfsnode *np = VTONFS(vp); 462 struct vattr vattr; 463 int error; 464 465 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 466 #ifdef DIAGNOSTIC 467 kprintf("open eacces vtyp=%d\n",vp->v_type); 468 #endif 469 return (EOPNOTSUPP); 470 } 471 472 /* 473 * Clear the attribute cache only if opening with write access. It 474 * is unclear if we should do this at all here, but we certainly 475 * should not clear the cache unconditionally simply because a file 476 * is being opened. 477 */ 478 if (ap->a_mode & FWRITE) 479 np->n_attrstamp = 0; 480 481 /* 482 * For normal NFS, reconcile changes made locally verses 483 * changes made remotely. Note that VOP_GETATTR only goes 484 * to the wire if the cached attribute has timed out or been 485 * cleared. 486 * 487 * If local modifications have been made clear the attribute 488 * cache to force an attribute and modified time check. If 489 * GETATTR detects that the file has been changed by someone 490 * other then us it will set NRMODIFIED. 491 * 492 * If we are opening a directory and local changes have been 493 * made we have to invalidate the cache in order to ensure 494 * that we get the most up-to-date information from the 495 * server. XXX 496 */ 497 if (np->n_flag & NLMODIFIED) { 498 np->n_attrstamp = 0; 499 if (vp->v_type == VDIR) { 500 error = nfs_vinvalbuf(vp, V_SAVE, 1); 501 if (error == EINTR) 502 return (error); 503 nfs_invaldir(vp); 504 } 505 } 506 error = VOP_GETATTR(vp, &vattr); 507 if (error) 508 return (error); 509 if (np->n_flag & NRMODIFIED) { 510 if (vp->v_type == VDIR) 511 nfs_invaldir(vp); 512 error = nfs_vinvalbuf(vp, V_SAVE, 1); 513 if (error == EINTR) 514 return (error); 515 np->n_flag &= ~NRMODIFIED; 516 } 517 518 return (vop_stdopen(ap)); 519 } 520 521 /* 522 * nfs close vnode op 523 * What an NFS client should do upon close after writing is a debatable issue. 524 * Most NFS clients push delayed writes to the server upon close, basically for 525 * two reasons: 526 * 1 - So that any write errors may be reported back to the client process 527 * doing the close system call. By far the two most likely errors are 528 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 529 * 2 - To put a worst case upper bound on cache inconsistency between 530 * multiple clients for the file. 531 * There is also a consistency problem for Version 2 of the protocol w.r.t. 532 * not being able to tell if other clients are writing a file concurrently, 533 * since there is no way of knowing if the changed modify time in the reply 534 * is only due to the write for this client. 535 * (NFS Version 3 provides weak cache consistency data in the reply that 536 * should be sufficient to detect and handle this case.) 537 * 538 * The current code does the following: 539 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 540 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 541 * or commit them (this satisfies 1 and 2 except for the 542 * case where the server crashes after this close but 543 * before the commit RPC, which is felt to be "good 544 * enough". Changing the last argument to nfs_flush() to 545 * a 1 would force a commit operation, if it is felt a 546 * commit is necessary now. 547 * for NQNFS - do nothing now, since 2 is dealt with via leases and 548 * 1 should be dealt with via an fsync() system call for 549 * cases where write errors are important. 550 * 551 * nfs_close(struct vnode *a_vp, int a_fflag) 552 */ 553 /* ARGSUSED */ 554 static int 555 nfs_close(struct vop_close_args *ap) 556 { 557 struct vnode *vp = ap->a_vp; 558 struct nfsnode *np = VTONFS(vp); 559 int error = 0; 560 thread_t td = curthread; 561 562 if (vp->v_type == VREG) { 563 if (np->n_flag & NLMODIFIED) { 564 if (NFS_ISV3(vp)) { 565 /* 566 * Under NFSv3 we have dirty buffers to dispose of. We 567 * must flush them to the NFS server. We have the option 568 * of waiting all the way through the commit rpc or just 569 * waiting for the initial write. The default is to only 570 * wait through the initial write so the data is in the 571 * server's cache, which is roughly similar to the state 572 * a standard disk subsystem leaves the file in on close(). 573 * 574 * We cannot clear the NLMODIFIED bit in np->n_flag due to 575 * potential races with other processes, and certainly 576 * cannot clear it if we don't commit. 577 */ 578 int cm = nfsv3_commit_on_close ? 1 : 0; 579 error = nfs_flush(vp, MNT_WAIT, td, cm); 580 /* np->n_flag &= ~NLMODIFIED; */ 581 } else { 582 error = nfs_vinvalbuf(vp, V_SAVE, 1); 583 } 584 np->n_attrstamp = 0; 585 } 586 if (np->n_flag & NWRITEERR) { 587 np->n_flag &= ~NWRITEERR; 588 error = np->n_error; 589 } 590 } 591 vop_stdclose(ap); 592 return (error); 593 } 594 595 /* 596 * nfs getattr call from vfs. 597 * 598 * nfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 599 */ 600 static int 601 nfs_getattr(struct vop_getattr_args *ap) 602 { 603 struct vnode *vp = ap->a_vp; 604 struct nfsnode *np = VTONFS(vp); 605 caddr_t cp; 606 u_int32_t *tl; 607 int32_t t1, t2; 608 caddr_t bpos, dpos; 609 int error = 0; 610 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 611 int v3 = NFS_ISV3(vp); 612 thread_t td = curthread; 613 614 /* 615 * Update local times for special files. 616 */ 617 if (np->n_flag & (NACC | NUPD)) 618 np->n_flag |= NCHG; 619 /* 620 * First look in the cache. 621 */ 622 if (nfs_getattrcache(vp, ap->a_vap) == 0) 623 return (0); 624 625 if (v3 && nfsaccess_cache_timeout > 0) { 626 nfsstats.accesscache_misses++; 627 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, nfs_vpcred(vp, ND_CHECK)); 628 if (nfs_getattrcache(vp, ap->a_vap) == 0) 629 return (0); 630 } 631 632 nfsstats.rpccnt[NFSPROC_GETATTR]++; 633 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 634 nfsm_fhtom(vp, v3); 635 nfsm_request(vp, NFSPROC_GETATTR, td, nfs_vpcred(vp, ND_CHECK)); 636 if (!error) { 637 nfsm_loadattr(vp, ap->a_vap); 638 } 639 m_freem(mrep); 640 nfsmout: 641 return (error); 642 } 643 644 /* 645 * nfs setattr call. 646 * 647 * nfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred) 648 */ 649 static int 650 nfs_setattr(struct vop_setattr_args *ap) 651 { 652 struct vnode *vp = ap->a_vp; 653 struct nfsnode *np = VTONFS(vp); 654 struct vattr *vap = ap->a_vap; 655 int error = 0; 656 u_quad_t tsize; 657 thread_t td = curthread; 658 659 #ifndef nolint 660 tsize = (u_quad_t)0; 661 #endif 662 663 /* 664 * Setting of flags is not supported. 665 */ 666 if (vap->va_flags != VNOVAL) 667 return (EOPNOTSUPP); 668 669 /* 670 * Disallow write attempts if the filesystem is mounted read-only. 671 */ 672 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 673 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 674 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 675 (vp->v_mount->mnt_flag & MNT_RDONLY)) 676 return (EROFS); 677 678 if (vap->va_size != VNOVAL) { 679 /* 680 * truncation requested 681 */ 682 switch (vp->v_type) { 683 case VDIR: 684 return (EISDIR); 685 case VCHR: 686 case VBLK: 687 case VSOCK: 688 case VFIFO: 689 if (vap->va_mtime.tv_sec == VNOVAL && 690 vap->va_atime.tv_sec == VNOVAL && 691 vap->va_mode == (mode_t)VNOVAL && 692 vap->va_uid == (uid_t)VNOVAL && 693 vap->va_gid == (gid_t)VNOVAL) 694 return (0); 695 vap->va_size = VNOVAL; 696 break; 697 default: 698 /* 699 * Disallow write attempts if the filesystem is 700 * mounted read-only. 701 */ 702 if (vp->v_mount->mnt_flag & MNT_RDONLY) 703 return (EROFS); 704 705 /* 706 * This is nasty. The RPCs we send to flush pending 707 * data often return attribute information which is 708 * cached via a callback to nfs_loadattrcache(), which 709 * has the effect of changing our notion of the file 710 * size. Due to flushed appends and other operations 711 * the file size can be set to virtually anything, 712 * including values that do not match either the old 713 * or intended file size. 714 * 715 * When this condition is detected we must loop to 716 * try the operation again. Hopefully no more 717 * flushing is required on the loop so it works the 718 * second time around. THIS CASE ALMOST ALWAYS 719 * HAPPENS! 720 */ 721 tsize = np->n_size; 722 again: 723 error = nfs_meta_setsize(vp, td, vap->va_size); 724 725 if (np->n_flag & NLMODIFIED) { 726 if (vap->va_size == 0) 727 error = nfs_vinvalbuf(vp, 0, 1); 728 else 729 error = nfs_vinvalbuf(vp, V_SAVE, 1); 730 } 731 /* 732 * note: this loop case almost always happens at 733 * least once per truncation. 734 */ 735 if (error == 0 && np->n_size != vap->va_size) 736 goto again; 737 np->n_vattr.va_size = vap->va_size; 738 break; 739 } 740 } else if ((np->n_flag & NLMODIFIED) && vp->v_type == VREG) { 741 /* 742 * What to do. If we are modifying the mtime we lose 743 * mtime detection of changes made by the server or other 744 * clients. But programs like rsync/rdist/cpdup are going 745 * to call utimes a lot. We don't want to piecemeal sync. 746 * 747 * For now sync if any prior remote changes were detected, 748 * but allow us to lose track of remote changes made during 749 * the utimes operation. 750 */ 751 if (np->n_flag & NRMODIFIED) 752 error = nfs_vinvalbuf(vp, V_SAVE, 1); 753 if (error == EINTR) 754 return (error); 755 if (error == 0) { 756 if (vap->va_mtime.tv_sec != VNOVAL) { 757 np->n_mtime = vap->va_mtime.tv_sec; 758 } 759 } 760 } 761 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 762 763 /* 764 * Sanity check if a truncation was issued. This should only occur 765 * if multiple processes are racing on the same file. 766 */ 767 if (error == 0 && vap->va_size != VNOVAL && 768 np->n_size != vap->va_size) { 769 kprintf("NFS ftruncate: server disagrees on the file size: %lld/%lld/%lld\n", tsize, vap->va_size, np->n_size); 770 goto again; 771 } 772 if (error && vap->va_size != VNOVAL) { 773 np->n_size = np->n_vattr.va_size = tsize; 774 vnode_pager_setsize(vp, np->n_size); 775 } 776 return (error); 777 } 778 779 /* 780 * Do an nfs setattr rpc. 781 */ 782 static int 783 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 784 struct ucred *cred, struct thread *td) 785 { 786 struct nfsv2_sattr *sp; 787 struct nfsnode *np = VTONFS(vp); 788 caddr_t cp; 789 int32_t t1, t2; 790 caddr_t bpos, dpos, cp2; 791 u_int32_t *tl; 792 int error = 0, wccflag = NFSV3_WCCRATTR; 793 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 794 int v3 = NFS_ISV3(vp); 795 796 nfsstats.rpccnt[NFSPROC_SETATTR]++; 797 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 798 nfsm_fhtom(vp, v3); 799 if (v3) { 800 nfsm_v3attrbuild(vap, TRUE); 801 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 802 *tl = nfs_false; 803 } else { 804 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 805 if (vap->va_mode == (mode_t)VNOVAL) 806 sp->sa_mode = nfs_xdrneg1; 807 else 808 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 809 if (vap->va_uid == (uid_t)VNOVAL) 810 sp->sa_uid = nfs_xdrneg1; 811 else 812 sp->sa_uid = txdr_unsigned(vap->va_uid); 813 if (vap->va_gid == (gid_t)VNOVAL) 814 sp->sa_gid = nfs_xdrneg1; 815 else 816 sp->sa_gid = txdr_unsigned(vap->va_gid); 817 sp->sa_size = txdr_unsigned(vap->va_size); 818 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 819 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 820 } 821 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 822 if (v3) { 823 np->n_modestamp = 0; 824 nfsm_wcc_data(vp, wccflag); 825 } else 826 nfsm_loadattr(vp, (struct vattr *)0); 827 m_freem(mrep); 828 nfsmout: 829 return (error); 830 } 831 832 static 833 void 834 nfs_cache_setvp(struct nchandle *nch, struct vnode *vp, int nctimeout) 835 { 836 if (nctimeout == 0) 837 nctimeout = 1; 838 else 839 nctimeout *= hz; 840 cache_setvp(nch, vp); 841 cache_settimeout(nch, nctimeout); 842 } 843 844 /* 845 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 846 * nfs_lookup() until all remaining new api calls are implemented. 847 * 848 * Resolve a namecache entry. This function is passed a locked ncp and 849 * must call nfs_cache_setvp() on it as appropriate to resolve the entry. 850 */ 851 static int 852 nfs_nresolve(struct vop_nresolve_args *ap) 853 { 854 struct thread *td = curthread; 855 struct namecache *ncp; 856 struct ucred *cred; 857 struct nfsnode *np; 858 struct vnode *dvp; 859 struct vnode *nvp; 860 nfsfh_t *fhp; 861 int attrflag; 862 int fhsize; 863 int error; 864 int len; 865 int v3; 866 /******NFSM MACROS********/ 867 struct mbuf *mb, *mrep, *mreq, *mb2, *md; 868 caddr_t bpos, dpos, cp, cp2; 869 u_int32_t *tl; 870 int32_t t1, t2; 871 872 cred = ap->a_cred; 873 dvp = ap->a_dvp; 874 875 if ((error = vget(dvp, LK_SHARED)) != 0) 876 return (error); 877 878 nvp = NULL; 879 v3 = NFS_ISV3(dvp); 880 nfsstats.lookupcache_misses++; 881 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 882 ncp = ap->a_nch->ncp; 883 len = ncp->nc_nlen; 884 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 885 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 886 nfsm_fhtom(dvp, v3); 887 nfsm_strtom(ncp->nc_name, len, NFS_MAXNAMLEN); 888 nfsm_request(dvp, NFSPROC_LOOKUP, td, ap->a_cred); 889 if (error) { 890 /* 891 * Cache negatve lookups to reduce NFS traffic, but use 892 * a fast timeout. Otherwise use a timeout of 1 tick. 893 * XXX we should add a namecache flag for no-caching 894 * to uncache the negative hit as soon as possible, but 895 * we cannot simply destroy the entry because it is used 896 * as a placeholder by the caller. 897 */ 898 if (error == ENOENT) 899 nfs_cache_setvp(ap->a_nch, NULL, nfsneg_cache_timeout); 900 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 901 m_freem(mrep); 902 goto nfsmout; 903 } 904 905 /* 906 * Success, get the file handle, do various checks, and load 907 * post-operation data from the reply packet. Theoretically 908 * we should never be looking up "." so, theoretically, we 909 * should never get the same file handle as our directory. But 910 * we check anyway. XXX 911 * 912 * Note that no timeout is set for the positive cache hit. We 913 * assume, theoretically, that ESTALE returns will be dealt with 914 * properly to handle NFS races and in anycase we cannot depend 915 * on a timeout to deal with NFS open/create/excl issues so instead 916 * of a bad hack here the rest of the NFS client code needs to do 917 * the right thing. 918 */ 919 nfsm_getfh(fhp, fhsize, v3); 920 921 np = VTONFS(dvp); 922 if (NFS_CMPFH(np, fhp, fhsize)) { 923 vref(dvp); 924 nvp = dvp; 925 } else { 926 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 927 if (error) { 928 m_freem(mrep); 929 vput(dvp); 930 return (error); 931 } 932 nvp = NFSTOV(np); 933 } 934 if (v3) { 935 nfsm_postop_attr(nvp, attrflag, NFS_LATTR_NOSHRINK); 936 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 937 } else { 938 nfsm_loadattr(nvp, NULL); 939 } 940 nfs_cache_setvp(ap->a_nch, nvp, nfspos_cache_timeout); 941 m_freem(mrep); 942 nfsmout: 943 vput(dvp); 944 if (nvp) { 945 if (nvp == dvp) 946 vrele(nvp); 947 else 948 vput(nvp); 949 } 950 return (error); 951 } 952 953 /* 954 * 'cached' nfs directory lookup 955 * 956 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 957 * 958 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 959 * struct componentname *a_cnp) 960 */ 961 static int 962 nfs_lookup(struct vop_old_lookup_args *ap) 963 { 964 struct componentname *cnp = ap->a_cnp; 965 struct vnode *dvp = ap->a_dvp; 966 struct vnode **vpp = ap->a_vpp; 967 int flags = cnp->cn_flags; 968 struct vnode *newvp; 969 u_int32_t *tl; 970 caddr_t cp; 971 int32_t t1, t2; 972 struct nfsmount *nmp; 973 caddr_t bpos, dpos, cp2; 974 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 975 long len; 976 nfsfh_t *fhp; 977 struct nfsnode *np; 978 int lockparent, wantparent, error = 0, attrflag, fhsize; 979 int v3 = NFS_ISV3(dvp); 980 981 /* 982 * Read-only mount check and directory check. 983 */ 984 *vpp = NULLVP; 985 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 986 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 987 return (EROFS); 988 989 if (dvp->v_type != VDIR) 990 return (ENOTDIR); 991 992 /* 993 * Look it up in the cache. Note that ENOENT is only returned if we 994 * previously entered a negative hit (see later on). The additional 995 * nfsneg_cache_timeout check causes previously cached results to 996 * be instantly ignored if the negative caching is turned off. 997 */ 998 lockparent = flags & CNP_LOCKPARENT; 999 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 1000 nmp = VFSTONFS(dvp->v_mount); 1001 np = VTONFS(dvp); 1002 1003 /* 1004 * Go to the wire. 1005 */ 1006 error = 0; 1007 newvp = NULLVP; 1008 nfsstats.lookupcache_misses++; 1009 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1010 len = cnp->cn_namelen; 1011 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 1012 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1013 nfsm_fhtom(dvp, v3); 1014 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1015 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 1016 if (error) { 1017 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1018 m_freem(mrep); 1019 goto nfsmout; 1020 } 1021 nfsm_getfh(fhp, fhsize, v3); 1022 1023 /* 1024 * Handle RENAME case... 1025 */ 1026 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1027 if (NFS_CMPFH(np, fhp, fhsize)) { 1028 m_freem(mrep); 1029 return (EISDIR); 1030 } 1031 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1032 if (error) { 1033 m_freem(mrep); 1034 return (error); 1035 } 1036 newvp = NFSTOV(np); 1037 if (v3) { 1038 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1039 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1040 } else 1041 nfsm_loadattr(newvp, (struct vattr *)0); 1042 *vpp = newvp; 1043 m_freem(mrep); 1044 if (!lockparent) { 1045 vn_unlock(dvp); 1046 cnp->cn_flags |= CNP_PDIRUNLOCK; 1047 } 1048 return (0); 1049 } 1050 1051 if (flags & CNP_ISDOTDOT) { 1052 vn_unlock(dvp); 1053 cnp->cn_flags |= CNP_PDIRUNLOCK; 1054 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1055 if (error) { 1056 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1057 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1058 return (error); /* NOTE: return error from nget */ 1059 } 1060 newvp = NFSTOV(np); 1061 if (lockparent) { 1062 error = vn_lock(dvp, LK_EXCLUSIVE); 1063 if (error) { 1064 vput(newvp); 1065 return (error); 1066 } 1067 cnp->cn_flags |= CNP_PDIRUNLOCK; 1068 } 1069 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1070 vref(dvp); 1071 newvp = dvp; 1072 } else { 1073 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1074 if (error) { 1075 m_freem(mrep); 1076 return (error); 1077 } 1078 if (!lockparent) { 1079 vn_unlock(dvp); 1080 cnp->cn_flags |= CNP_PDIRUNLOCK; 1081 } 1082 newvp = NFSTOV(np); 1083 } 1084 if (v3) { 1085 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1086 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1087 } else 1088 nfsm_loadattr(newvp, (struct vattr *)0); 1089 #if 0 1090 /* XXX MOVE TO nfs_nremove() */ 1091 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1092 cnp->cn_nameiop != NAMEI_DELETE) { 1093 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1094 } 1095 #endif 1096 *vpp = newvp; 1097 m_freem(mrep); 1098 nfsmout: 1099 if (error) { 1100 if (newvp != NULLVP) { 1101 vrele(newvp); 1102 *vpp = NULLVP; 1103 } 1104 if ((cnp->cn_nameiop == NAMEI_CREATE || 1105 cnp->cn_nameiop == NAMEI_RENAME) && 1106 error == ENOENT) { 1107 if (!lockparent) { 1108 vn_unlock(dvp); 1109 cnp->cn_flags |= CNP_PDIRUNLOCK; 1110 } 1111 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1112 error = EROFS; 1113 else 1114 error = EJUSTRETURN; 1115 } 1116 } 1117 return (error); 1118 } 1119 1120 /* 1121 * nfs read call. 1122 * Just call nfs_bioread() to do the work. 1123 * 1124 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1125 * struct ucred *a_cred) 1126 */ 1127 static int 1128 nfs_read(struct vop_read_args *ap) 1129 { 1130 struct vnode *vp = ap->a_vp; 1131 1132 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1133 switch (vp->v_type) { 1134 case VREG: 1135 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1136 case VDIR: 1137 return (EISDIR); 1138 default: 1139 return EOPNOTSUPP; 1140 } 1141 } 1142 1143 /* 1144 * nfs readlink call 1145 * 1146 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1147 */ 1148 static int 1149 nfs_readlink(struct vop_readlink_args *ap) 1150 { 1151 struct vnode *vp = ap->a_vp; 1152 1153 if (vp->v_type != VLNK) 1154 return (EINVAL); 1155 return (nfs_bioread(vp, ap->a_uio, 0)); 1156 } 1157 1158 /* 1159 * Do a readlink rpc. 1160 * Called by nfs_doio() from below the buffer cache. 1161 */ 1162 int 1163 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1164 { 1165 u_int32_t *tl; 1166 caddr_t cp; 1167 int32_t t1, t2; 1168 caddr_t bpos, dpos, cp2; 1169 int error = 0, len, attrflag; 1170 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1171 int v3 = NFS_ISV3(vp); 1172 1173 nfsstats.rpccnt[NFSPROC_READLINK]++; 1174 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1175 nfsm_fhtom(vp, v3); 1176 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, nfs_vpcred(vp, ND_CHECK)); 1177 if (v3) 1178 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1179 if (!error) { 1180 nfsm_strsiz(len, NFS_MAXPATHLEN); 1181 if (len == NFS_MAXPATHLEN) { 1182 struct nfsnode *np = VTONFS(vp); 1183 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1184 len = np->n_size; 1185 } 1186 nfsm_mtouio(uiop, len); 1187 } 1188 m_freem(mrep); 1189 nfsmout: 1190 return (error); 1191 } 1192 1193 /* 1194 * nfs read rpc call 1195 * Ditto above 1196 */ 1197 int 1198 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1199 { 1200 u_int32_t *tl; 1201 caddr_t cp; 1202 int32_t t1, t2; 1203 caddr_t bpos, dpos, cp2; 1204 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1205 struct nfsmount *nmp; 1206 int error = 0, len, retlen, tsiz, eof, attrflag; 1207 int v3 = NFS_ISV3(vp); 1208 1209 #ifndef nolint 1210 eof = 0; 1211 #endif 1212 nmp = VFSTONFS(vp->v_mount); 1213 tsiz = uiop->uio_resid; 1214 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1215 return (EFBIG); 1216 while (tsiz > 0) { 1217 nfsstats.rpccnt[NFSPROC_READ]++; 1218 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1219 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1220 nfsm_fhtom(vp, v3); 1221 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1222 if (v3) { 1223 txdr_hyper(uiop->uio_offset, tl); 1224 *(tl + 2) = txdr_unsigned(len); 1225 } else { 1226 *tl++ = txdr_unsigned(uiop->uio_offset); 1227 *tl++ = txdr_unsigned(len); 1228 *tl = 0; 1229 } 1230 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 1231 if (v3) { 1232 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1233 if (error) { 1234 m_freem(mrep); 1235 goto nfsmout; 1236 } 1237 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1238 eof = fxdr_unsigned(int, *(tl + 1)); 1239 } else 1240 nfsm_loadattr(vp, (struct vattr *)0); 1241 nfsm_strsiz(retlen, nmp->nm_rsize); 1242 nfsm_mtouio(uiop, retlen); 1243 m_freem(mrep); 1244 tsiz -= retlen; 1245 if (v3) { 1246 if (eof || retlen == 0) { 1247 tsiz = 0; 1248 } 1249 } else if (retlen < len) { 1250 tsiz = 0; 1251 } 1252 } 1253 nfsmout: 1254 return (error); 1255 } 1256 1257 /* 1258 * nfs write call 1259 */ 1260 int 1261 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit) 1262 { 1263 u_int32_t *tl; 1264 caddr_t cp; 1265 int32_t t1, t2, backup; 1266 caddr_t bpos, dpos, cp2; 1267 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1268 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1269 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1270 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1271 1272 #ifndef DIAGNOSTIC 1273 if (uiop->uio_iovcnt != 1) 1274 panic("nfs: writerpc iovcnt > 1"); 1275 #endif 1276 *must_commit = 0; 1277 tsiz = uiop->uio_resid; 1278 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1279 return (EFBIG); 1280 while (tsiz > 0) { 1281 nfsstats.rpccnt[NFSPROC_WRITE]++; 1282 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1283 nfsm_reqhead(vp, NFSPROC_WRITE, 1284 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1285 nfsm_fhtom(vp, v3); 1286 if (v3) { 1287 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1288 txdr_hyper(uiop->uio_offset, tl); 1289 tl += 2; 1290 *tl++ = txdr_unsigned(len); 1291 *tl++ = txdr_unsigned(*iomode); 1292 *tl = txdr_unsigned(len); 1293 } else { 1294 u_int32_t x; 1295 1296 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1297 /* Set both "begin" and "current" to non-garbage. */ 1298 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1299 *tl++ = x; /* "begin offset" */ 1300 *tl++ = x; /* "current offset" */ 1301 x = txdr_unsigned(len); 1302 *tl++ = x; /* total to this offset */ 1303 *tl = x; /* size of this write */ 1304 } 1305 nfsm_uiotom(uiop, len); 1306 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, nfs_vpcred(vp, ND_WRITE)); 1307 if (v3) { 1308 /* 1309 * The write RPC returns a before and after mtime. The 1310 * nfsm_wcc_data() macro checks the before n_mtime 1311 * against the before time and stores the after time 1312 * in the nfsnode's cached vattr and n_mtime field. 1313 * The NRMODIFIED bit will be set if the before 1314 * time did not match the original mtime. 1315 */ 1316 wccflag = NFSV3_WCCCHK; 1317 nfsm_wcc_data(vp, wccflag); 1318 if (!error) { 1319 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1320 + NFSX_V3WRITEVERF); 1321 rlen = fxdr_unsigned(int, *tl++); 1322 if (rlen == 0) { 1323 error = NFSERR_IO; 1324 m_freem(mrep); 1325 break; 1326 } else if (rlen < len) { 1327 backup = len - rlen; 1328 uiop->uio_iov->iov_base -= backup; 1329 uiop->uio_iov->iov_len += backup; 1330 uiop->uio_offset -= backup; 1331 uiop->uio_resid += backup; 1332 len = rlen; 1333 } 1334 commit = fxdr_unsigned(int, *tl++); 1335 1336 /* 1337 * Return the lowest committment level 1338 * obtained by any of the RPCs. 1339 */ 1340 if (committed == NFSV3WRITE_FILESYNC) 1341 committed = commit; 1342 else if (committed == NFSV3WRITE_DATASYNC && 1343 commit == NFSV3WRITE_UNSTABLE) 1344 committed = commit; 1345 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1346 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1347 NFSX_V3WRITEVERF); 1348 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1349 } else if (bcmp((caddr_t)tl, 1350 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1351 *must_commit = 1; 1352 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1353 NFSX_V3WRITEVERF); 1354 } 1355 } 1356 } else { 1357 nfsm_loadattr(vp, (struct vattr *)0); 1358 } 1359 m_freem(mrep); 1360 if (error) 1361 break; 1362 tsiz -= len; 1363 } 1364 nfsmout: 1365 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1366 committed = NFSV3WRITE_FILESYNC; 1367 *iomode = committed; 1368 if (error) 1369 uiop->uio_resid = tsiz; 1370 return (error); 1371 } 1372 1373 /* 1374 * nfs mknod rpc 1375 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1376 * mode set to specify the file type and the size field for rdev. 1377 */ 1378 static int 1379 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1380 struct vattr *vap) 1381 { 1382 struct nfsv2_sattr *sp; 1383 u_int32_t *tl; 1384 caddr_t cp; 1385 int32_t t1, t2; 1386 struct vnode *newvp = (struct vnode *)0; 1387 struct nfsnode *np = (struct nfsnode *)0; 1388 struct vattr vattr; 1389 char *cp2; 1390 caddr_t bpos, dpos; 1391 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1392 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1393 int rmajor, rminor; 1394 int v3 = NFS_ISV3(dvp); 1395 1396 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1397 rmajor = txdr_unsigned(vap->va_rmajor); 1398 rminor = txdr_unsigned(vap->va_rminor); 1399 } else if (vap->va_type == VFIFO || vap->va_type == VSOCK) { 1400 rmajor = nfs_xdrneg1; 1401 rminor = nfs_xdrneg1; 1402 } else { 1403 return (EOPNOTSUPP); 1404 } 1405 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1406 return (error); 1407 } 1408 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1409 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1410 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1411 nfsm_fhtom(dvp, v3); 1412 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1413 if (v3) { 1414 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1415 *tl++ = vtonfsv3_type(vap->va_type); 1416 nfsm_v3attrbuild(vap, FALSE); 1417 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1418 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1419 *tl++ = txdr_unsigned(vap->va_rmajor); 1420 *tl = txdr_unsigned(vap->va_rminor); 1421 } 1422 } else { 1423 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1424 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1425 sp->sa_uid = nfs_xdrneg1; 1426 sp->sa_gid = nfs_xdrneg1; 1427 sp->sa_size = makeudev(rmajor, rminor); 1428 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1429 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1430 } 1431 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1432 if (!error) { 1433 nfsm_mtofh(dvp, newvp, v3, gotvp); 1434 if (!gotvp) { 1435 if (newvp) { 1436 vput(newvp); 1437 newvp = (struct vnode *)0; 1438 } 1439 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1440 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1441 if (!error) 1442 newvp = NFSTOV(np); 1443 } 1444 } 1445 if (v3) 1446 nfsm_wcc_data(dvp, wccflag); 1447 m_freem(mrep); 1448 nfsmout: 1449 if (error) { 1450 if (newvp) 1451 vput(newvp); 1452 } else { 1453 *vpp = newvp; 1454 } 1455 VTONFS(dvp)->n_flag |= NLMODIFIED; 1456 if (!wccflag) 1457 VTONFS(dvp)->n_attrstamp = 0; 1458 return (error); 1459 } 1460 1461 /* 1462 * nfs mknod vop 1463 * just call nfs_mknodrpc() to do the work. 1464 * 1465 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1466 * struct componentname *a_cnp, struct vattr *a_vap) 1467 */ 1468 /* ARGSUSED */ 1469 static int 1470 nfs_mknod(struct vop_old_mknod_args *ap) 1471 { 1472 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1473 } 1474 1475 static u_long create_verf; 1476 /* 1477 * nfs file create call 1478 * 1479 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1480 * struct componentname *a_cnp, struct vattr *a_vap) 1481 */ 1482 static int 1483 nfs_create(struct vop_old_create_args *ap) 1484 { 1485 struct vnode *dvp = ap->a_dvp; 1486 struct vattr *vap = ap->a_vap; 1487 struct componentname *cnp = ap->a_cnp; 1488 struct nfsv2_sattr *sp; 1489 u_int32_t *tl; 1490 caddr_t cp; 1491 int32_t t1, t2; 1492 struct nfsnode *np = (struct nfsnode *)0; 1493 struct vnode *newvp = (struct vnode *)0; 1494 caddr_t bpos, dpos, cp2; 1495 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1496 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1497 struct vattr vattr; 1498 int v3 = NFS_ISV3(dvp); 1499 1500 /* 1501 * Oops, not for me.. 1502 */ 1503 if (vap->va_type == VSOCK) 1504 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1505 1506 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1507 return (error); 1508 } 1509 if (vap->va_vaflags & VA_EXCLUSIVE) 1510 fmode |= O_EXCL; 1511 again: 1512 nfsstats.rpccnt[NFSPROC_CREATE]++; 1513 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1514 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1515 nfsm_fhtom(dvp, v3); 1516 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1517 if (v3) { 1518 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1519 if (fmode & O_EXCL) { 1520 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1521 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1522 #ifdef INET 1523 if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) 1524 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia)->sin_addr.s_addr; 1525 else 1526 #endif 1527 *tl++ = create_verf; 1528 *tl = ++create_verf; 1529 } else { 1530 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1531 nfsm_v3attrbuild(vap, FALSE); 1532 } 1533 } else { 1534 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1535 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1536 sp->sa_uid = nfs_xdrneg1; 1537 sp->sa_gid = nfs_xdrneg1; 1538 sp->sa_size = 0; 1539 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1540 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1541 } 1542 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1543 if (!error) { 1544 nfsm_mtofh(dvp, newvp, v3, gotvp); 1545 if (!gotvp) { 1546 if (newvp) { 1547 vput(newvp); 1548 newvp = (struct vnode *)0; 1549 } 1550 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1551 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1552 if (!error) 1553 newvp = NFSTOV(np); 1554 } 1555 } 1556 if (v3) 1557 nfsm_wcc_data(dvp, wccflag); 1558 m_freem(mrep); 1559 nfsmout: 1560 if (error) { 1561 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1562 KKASSERT(newvp == NULL); 1563 fmode &= ~O_EXCL; 1564 goto again; 1565 } 1566 } else if (v3 && (fmode & O_EXCL)) { 1567 /* 1568 * We are normally called with only a partially initialized 1569 * VAP. Since the NFSv3 spec says that server may use the 1570 * file attributes to store the verifier, the spec requires 1571 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1572 * in atime, but we can't really assume that all servers will 1573 * so we ensure that our SETATTR sets both atime and mtime. 1574 */ 1575 if (vap->va_mtime.tv_sec == VNOVAL) 1576 vfs_timestamp(&vap->va_mtime); 1577 if (vap->va_atime.tv_sec == VNOVAL) 1578 vap->va_atime = vap->va_mtime; 1579 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1580 } 1581 if (error == 0) { 1582 /* 1583 * The new np may have enough info for access 1584 * checks, make sure rucred and wucred are 1585 * initialized for read and write rpc's. 1586 */ 1587 np = VTONFS(newvp); 1588 if (np->n_rucred == NULL) 1589 np->n_rucred = crhold(cnp->cn_cred); 1590 if (np->n_wucred == NULL) 1591 np->n_wucred = crhold(cnp->cn_cred); 1592 *ap->a_vpp = newvp; 1593 } else if (newvp) { 1594 vput(newvp); 1595 } 1596 VTONFS(dvp)->n_flag |= NLMODIFIED; 1597 if (!wccflag) 1598 VTONFS(dvp)->n_attrstamp = 0; 1599 return (error); 1600 } 1601 1602 /* 1603 * nfs file remove call 1604 * To try and make nfs semantics closer to ufs semantics, a file that has 1605 * other processes using the vnode is renamed instead of removed and then 1606 * removed later on the last close. 1607 * - If v_sysref.refcnt > 1 1608 * If a rename is not already in the works 1609 * call nfs_sillyrename() to set it up 1610 * else 1611 * do the remove rpc 1612 * 1613 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1614 * struct componentname *a_cnp) 1615 */ 1616 static int 1617 nfs_remove(struct vop_old_remove_args *ap) 1618 { 1619 struct vnode *vp = ap->a_vp; 1620 struct vnode *dvp = ap->a_dvp; 1621 struct componentname *cnp = ap->a_cnp; 1622 struct nfsnode *np = VTONFS(vp); 1623 int error = 0; 1624 struct vattr vattr; 1625 1626 #ifndef DIAGNOSTIC 1627 if (vp->v_sysref.refcnt < 1) 1628 panic("nfs_remove: bad v_sysref.refcnt"); 1629 #endif 1630 if (vp->v_type == VDIR) 1631 error = EPERM; 1632 else if (vp->v_sysref.refcnt == 1 || (np->n_sillyrename && 1633 VOP_GETATTR(vp, &vattr) == 0 && 1634 vattr.va_nlink > 1)) { 1635 /* 1636 * throw away biocache buffers, mainly to avoid 1637 * unnecessary delayed writes later. 1638 */ 1639 error = nfs_vinvalbuf(vp, 0, 1); 1640 /* Do the rpc */ 1641 if (error != EINTR) 1642 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1643 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1644 /* 1645 * Kludge City: If the first reply to the remove rpc is lost.. 1646 * the reply to the retransmitted request will be ENOENT 1647 * since the file was in fact removed 1648 * Therefore, we cheat and return success. 1649 */ 1650 if (error == ENOENT) 1651 error = 0; 1652 } else if (!np->n_sillyrename) { 1653 error = nfs_sillyrename(dvp, vp, cnp); 1654 } 1655 np->n_attrstamp = 0; 1656 return (error); 1657 } 1658 1659 /* 1660 * nfs file remove rpc called from nfs_inactive 1661 */ 1662 int 1663 nfs_removeit(struct sillyrename *sp) 1664 { 1665 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1666 sp->s_cred, NULL)); 1667 } 1668 1669 /* 1670 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1671 */ 1672 static int 1673 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1674 struct ucred *cred, struct thread *td) 1675 { 1676 u_int32_t *tl; 1677 caddr_t cp; 1678 int32_t t1, t2; 1679 caddr_t bpos, dpos, cp2; 1680 int error = 0, wccflag = NFSV3_WCCRATTR; 1681 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1682 int v3 = NFS_ISV3(dvp); 1683 1684 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1685 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1686 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1687 nfsm_fhtom(dvp, v3); 1688 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1689 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1690 if (v3) 1691 nfsm_wcc_data(dvp, wccflag); 1692 m_freem(mrep); 1693 nfsmout: 1694 VTONFS(dvp)->n_flag |= NLMODIFIED; 1695 if (!wccflag) 1696 VTONFS(dvp)->n_attrstamp = 0; 1697 return (error); 1698 } 1699 1700 /* 1701 * nfs file rename call 1702 * 1703 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1704 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1705 * struct vnode *a_tvp, struct componentname *a_tcnp) 1706 */ 1707 static int 1708 nfs_rename(struct vop_old_rename_args *ap) 1709 { 1710 struct vnode *fvp = ap->a_fvp; 1711 struct vnode *tvp = ap->a_tvp; 1712 struct vnode *fdvp = ap->a_fdvp; 1713 struct vnode *tdvp = ap->a_tdvp; 1714 struct componentname *tcnp = ap->a_tcnp; 1715 struct componentname *fcnp = ap->a_fcnp; 1716 int error; 1717 1718 /* Check for cross-device rename */ 1719 if ((fvp->v_mount != tdvp->v_mount) || 1720 (tvp && (fvp->v_mount != tvp->v_mount))) { 1721 error = EXDEV; 1722 goto out; 1723 } 1724 1725 /* 1726 * We shouldn't have to flush fvp on rename as the file handle should 1727 * not change, but the default is to do so. 1728 * 1729 * We must flush tvp on rename because it might become stale on the 1730 * server after the rename. 1731 */ 1732 if (nfs_flush_on_rename) 1733 VOP_FSYNC(fvp, MNT_WAIT); 1734 if (tvp) 1735 VOP_FSYNC(tvp, MNT_WAIT); 1736 1737 /* 1738 * If the tvp exists and is in use, sillyrename it before doing the 1739 * rename of the new file over it. 1740 * 1741 * XXX Can't sillyrename a directory. 1742 * 1743 * We do not attempt to do any namecache purges in this old API 1744 * routine. The new API compat functions have access to the actual 1745 * namecache structures and will do it for us. 1746 */ 1747 if (tvp && tvp->v_sysref.refcnt > 1 && !VTONFS(tvp)->n_sillyrename && 1748 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1749 vput(tvp); 1750 tvp = NULL; 1751 } else if (tvp) { 1752 ; 1753 } 1754 1755 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1756 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1757 tcnp->cn_td); 1758 1759 out: 1760 if (tdvp == tvp) 1761 vrele(tdvp); 1762 else 1763 vput(tdvp); 1764 if (tvp) 1765 vput(tvp); 1766 vrele(fdvp); 1767 vrele(fvp); 1768 /* 1769 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1770 */ 1771 if (error == ENOENT) 1772 error = 0; 1773 return (error); 1774 } 1775 1776 /* 1777 * nfs file rename rpc called from nfs_remove() above 1778 */ 1779 static int 1780 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1781 struct sillyrename *sp) 1782 { 1783 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1784 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1785 } 1786 1787 /* 1788 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1789 */ 1790 static int 1791 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1792 struct vnode *tdvp, const char *tnameptr, int tnamelen, 1793 struct ucred *cred, struct thread *td) 1794 { 1795 u_int32_t *tl; 1796 caddr_t cp; 1797 int32_t t1, t2; 1798 caddr_t bpos, dpos, cp2; 1799 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1800 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1801 int v3 = NFS_ISV3(fdvp); 1802 1803 nfsstats.rpccnt[NFSPROC_RENAME]++; 1804 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1805 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1806 nfsm_rndup(tnamelen)); 1807 nfsm_fhtom(fdvp, v3); 1808 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1809 nfsm_fhtom(tdvp, v3); 1810 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1811 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1812 if (v3) { 1813 nfsm_wcc_data(fdvp, fwccflag); 1814 nfsm_wcc_data(tdvp, twccflag); 1815 } 1816 m_freem(mrep); 1817 nfsmout: 1818 VTONFS(fdvp)->n_flag |= NLMODIFIED; 1819 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1820 if (!fwccflag) 1821 VTONFS(fdvp)->n_attrstamp = 0; 1822 if (!twccflag) 1823 VTONFS(tdvp)->n_attrstamp = 0; 1824 return (error); 1825 } 1826 1827 /* 1828 * nfs hard link create call 1829 * 1830 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 1831 * struct componentname *a_cnp) 1832 */ 1833 static int 1834 nfs_link(struct vop_old_link_args *ap) 1835 { 1836 struct vnode *vp = ap->a_vp; 1837 struct vnode *tdvp = ap->a_tdvp; 1838 struct componentname *cnp = ap->a_cnp; 1839 u_int32_t *tl; 1840 caddr_t cp; 1841 int32_t t1, t2; 1842 caddr_t bpos, dpos, cp2; 1843 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1844 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1845 int v3; 1846 1847 if (vp->v_mount != tdvp->v_mount) { 1848 return (EXDEV); 1849 } 1850 1851 /* 1852 * Push all writes to the server, so that the attribute cache 1853 * doesn't get "out of sync" with the server. 1854 * XXX There should be a better way! 1855 */ 1856 VOP_FSYNC(vp, MNT_WAIT); 1857 1858 v3 = NFS_ISV3(vp); 1859 nfsstats.rpccnt[NFSPROC_LINK]++; 1860 nfsm_reqhead(vp, NFSPROC_LINK, 1861 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1862 nfsm_fhtom(vp, v3); 1863 nfsm_fhtom(tdvp, v3); 1864 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1865 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1866 if (v3) { 1867 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1868 nfsm_wcc_data(tdvp, wccflag); 1869 } 1870 m_freem(mrep); 1871 nfsmout: 1872 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1873 if (!attrflag) 1874 VTONFS(vp)->n_attrstamp = 0; 1875 if (!wccflag) 1876 VTONFS(tdvp)->n_attrstamp = 0; 1877 /* 1878 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1879 */ 1880 if (error == EEXIST) 1881 error = 0; 1882 return (error); 1883 } 1884 1885 /* 1886 * nfs symbolic link create call 1887 * 1888 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1889 * struct componentname *a_cnp, struct vattr *a_vap, 1890 * char *a_target) 1891 */ 1892 static int 1893 nfs_symlink(struct vop_old_symlink_args *ap) 1894 { 1895 struct vnode *dvp = ap->a_dvp; 1896 struct vattr *vap = ap->a_vap; 1897 struct componentname *cnp = ap->a_cnp; 1898 struct nfsv2_sattr *sp; 1899 u_int32_t *tl; 1900 caddr_t cp; 1901 int32_t t1, t2; 1902 caddr_t bpos, dpos, cp2; 1903 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1904 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1905 struct vnode *newvp = (struct vnode *)0; 1906 int v3 = NFS_ISV3(dvp); 1907 1908 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1909 slen = strlen(ap->a_target); 1910 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1911 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1912 nfsm_fhtom(dvp, v3); 1913 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1914 if (v3) { 1915 nfsm_v3attrbuild(vap, FALSE); 1916 } 1917 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1918 if (!v3) { 1919 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1920 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1921 sp->sa_uid = nfs_xdrneg1; 1922 sp->sa_gid = nfs_xdrneg1; 1923 sp->sa_size = nfs_xdrneg1; 1924 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1925 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1926 } 1927 1928 /* 1929 * Issue the NFS request and get the rpc response. 1930 * 1931 * Only NFSv3 responses returning an error of 0 actually return 1932 * a file handle that can be converted into newvp without having 1933 * to do an extra lookup rpc. 1934 */ 1935 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1936 if (v3) { 1937 if (error == 0) 1938 nfsm_mtofh(dvp, newvp, v3, gotvp); 1939 nfsm_wcc_data(dvp, wccflag); 1940 } 1941 1942 /* 1943 * out code jumps -> here, mrep is also freed. 1944 */ 1945 1946 m_freem(mrep); 1947 nfsmout: 1948 1949 /* 1950 * If we get an EEXIST error, silently convert it to no-error 1951 * in case of an NFS retry. 1952 */ 1953 if (error == EEXIST) 1954 error = 0; 1955 1956 /* 1957 * If we do not have (or no longer have) an error, and we could 1958 * not extract the newvp from the response due to the request being 1959 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1960 * to obtain a newvp to return. 1961 */ 1962 if (error == 0 && newvp == NULL) { 1963 struct nfsnode *np = NULL; 1964 1965 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1966 cnp->cn_cred, cnp->cn_td, &np); 1967 if (!error) 1968 newvp = NFSTOV(np); 1969 } 1970 if (error) { 1971 if (newvp) 1972 vput(newvp); 1973 } else { 1974 *ap->a_vpp = newvp; 1975 } 1976 VTONFS(dvp)->n_flag |= NLMODIFIED; 1977 if (!wccflag) 1978 VTONFS(dvp)->n_attrstamp = 0; 1979 return (error); 1980 } 1981 1982 /* 1983 * nfs make dir call 1984 * 1985 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 1986 * struct componentname *a_cnp, struct vattr *a_vap) 1987 */ 1988 static int 1989 nfs_mkdir(struct vop_old_mkdir_args *ap) 1990 { 1991 struct vnode *dvp = ap->a_dvp; 1992 struct vattr *vap = ap->a_vap; 1993 struct componentname *cnp = ap->a_cnp; 1994 struct nfsv2_sattr *sp; 1995 u_int32_t *tl; 1996 caddr_t cp; 1997 int32_t t1, t2; 1998 int len; 1999 struct nfsnode *np = (struct nfsnode *)0; 2000 struct vnode *newvp = (struct vnode *)0; 2001 caddr_t bpos, dpos, cp2; 2002 int error = 0, wccflag = NFSV3_WCCRATTR; 2003 int gotvp = 0; 2004 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2005 struct vattr vattr; 2006 int v3 = NFS_ISV3(dvp); 2007 2008 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 2009 return (error); 2010 } 2011 len = cnp->cn_namelen; 2012 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2013 nfsm_reqhead(dvp, NFSPROC_MKDIR, 2014 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2015 nfsm_fhtom(dvp, v3); 2016 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2017 if (v3) { 2018 nfsm_v3attrbuild(vap, FALSE); 2019 } else { 2020 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2021 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2022 sp->sa_uid = nfs_xdrneg1; 2023 sp->sa_gid = nfs_xdrneg1; 2024 sp->sa_size = nfs_xdrneg1; 2025 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2026 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2027 } 2028 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 2029 if (!error) 2030 nfsm_mtofh(dvp, newvp, v3, gotvp); 2031 if (v3) 2032 nfsm_wcc_data(dvp, wccflag); 2033 m_freem(mrep); 2034 nfsmout: 2035 VTONFS(dvp)->n_flag |= NLMODIFIED; 2036 if (!wccflag) 2037 VTONFS(dvp)->n_attrstamp = 0; 2038 /* 2039 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2040 * if we can succeed in looking up the directory. 2041 */ 2042 if (error == EEXIST || (!error && !gotvp)) { 2043 if (newvp) { 2044 vrele(newvp); 2045 newvp = (struct vnode *)0; 2046 } 2047 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2048 cnp->cn_td, &np); 2049 if (!error) { 2050 newvp = NFSTOV(np); 2051 if (newvp->v_type != VDIR) 2052 error = EEXIST; 2053 } 2054 } 2055 if (error) { 2056 if (newvp) 2057 vrele(newvp); 2058 } else 2059 *ap->a_vpp = newvp; 2060 return (error); 2061 } 2062 2063 /* 2064 * nfs remove directory call 2065 * 2066 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2067 * struct componentname *a_cnp) 2068 */ 2069 static int 2070 nfs_rmdir(struct vop_old_rmdir_args *ap) 2071 { 2072 struct vnode *vp = ap->a_vp; 2073 struct vnode *dvp = ap->a_dvp; 2074 struct componentname *cnp = ap->a_cnp; 2075 u_int32_t *tl; 2076 caddr_t cp; 2077 int32_t t1, t2; 2078 caddr_t bpos, dpos, cp2; 2079 int error = 0, wccflag = NFSV3_WCCRATTR; 2080 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2081 int v3 = NFS_ISV3(dvp); 2082 2083 if (dvp == vp) 2084 return (EINVAL); 2085 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2086 nfsm_reqhead(dvp, NFSPROC_RMDIR, 2087 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2088 nfsm_fhtom(dvp, v3); 2089 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2090 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2091 if (v3) 2092 nfsm_wcc_data(dvp, wccflag); 2093 m_freem(mrep); 2094 nfsmout: 2095 VTONFS(dvp)->n_flag |= NLMODIFIED; 2096 if (!wccflag) 2097 VTONFS(dvp)->n_attrstamp = 0; 2098 /* 2099 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2100 */ 2101 if (error == ENOENT) 2102 error = 0; 2103 return (error); 2104 } 2105 2106 /* 2107 * nfs readdir call 2108 * 2109 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2110 */ 2111 static int 2112 nfs_readdir(struct vop_readdir_args *ap) 2113 { 2114 struct vnode *vp = ap->a_vp; 2115 struct nfsnode *np = VTONFS(vp); 2116 struct uio *uio = ap->a_uio; 2117 int tresid, error; 2118 struct vattr vattr; 2119 2120 if (vp->v_type != VDIR) 2121 return (EPERM); 2122 2123 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 2124 return (error); 2125 2126 /* 2127 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2128 * and then check that is still valid, or if this is an NQNFS mount 2129 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2130 * VOP_GETATTR() does not necessarily go to the wire. 2131 */ 2132 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2133 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2134 if (VOP_GETATTR(vp, &vattr) == 0 && 2135 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2136 ) { 2137 nfsstats.direofcache_hits++; 2138 goto done; 2139 } 2140 } 2141 2142 /* 2143 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2144 * own cache coherency checks so we do not have to. 2145 */ 2146 tresid = uio->uio_resid; 2147 error = nfs_bioread(vp, uio, 0); 2148 2149 if (!error && uio->uio_resid == tresid) 2150 nfsstats.direofcache_misses++; 2151 done: 2152 vn_unlock(vp); 2153 return (error); 2154 } 2155 2156 /* 2157 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2158 * 2159 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2160 * offset/block and converts the nfs formatted directory entries for userland 2161 * consumption as well as deals with offsets into the middle of blocks. 2162 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2163 * be block-bounded. It must convert to cookies for the actual RPC. 2164 */ 2165 int 2166 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2167 { 2168 int len, left; 2169 struct nfs_dirent *dp = NULL; 2170 u_int32_t *tl; 2171 caddr_t cp; 2172 int32_t t1, t2; 2173 nfsuint64 *cookiep; 2174 caddr_t bpos, dpos, cp2; 2175 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2176 nfsuint64 cookie; 2177 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2178 struct nfsnode *dnp = VTONFS(vp); 2179 u_quad_t fileno; 2180 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2181 int attrflag; 2182 int v3 = NFS_ISV3(vp); 2183 2184 #ifndef DIAGNOSTIC 2185 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2186 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2187 panic("nfs readdirrpc bad uio"); 2188 #endif 2189 2190 /* 2191 * If there is no cookie, assume directory was stale. 2192 */ 2193 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2194 if (cookiep) 2195 cookie = *cookiep; 2196 else 2197 return (NFSERR_BAD_COOKIE); 2198 /* 2199 * Loop around doing readdir rpc's of size nm_readdirsize 2200 * truncated to a multiple of DIRBLKSIZ. 2201 * The stopping criteria is EOF or buffer full. 2202 */ 2203 while (more_dirs && bigenough) { 2204 nfsstats.rpccnt[NFSPROC_READDIR]++; 2205 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2206 NFSX_READDIR(v3)); 2207 nfsm_fhtom(vp, v3); 2208 if (v3) { 2209 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2210 *tl++ = cookie.nfsuquad[0]; 2211 *tl++ = cookie.nfsuquad[1]; 2212 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2213 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2214 } else { 2215 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2216 *tl++ = cookie.nfsuquad[0]; 2217 } 2218 *tl = txdr_unsigned(nmp->nm_readdirsize); 2219 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2220 if (v3) { 2221 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2222 if (!error) { 2223 nfsm_dissect(tl, u_int32_t *, 2224 2 * NFSX_UNSIGNED); 2225 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2226 dnp->n_cookieverf.nfsuquad[1] = *tl; 2227 } else { 2228 m_freem(mrep); 2229 goto nfsmout; 2230 } 2231 } 2232 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2233 more_dirs = fxdr_unsigned(int, *tl); 2234 2235 /* loop thru the dir entries, converting them to std form */ 2236 while (more_dirs && bigenough) { 2237 if (v3) { 2238 nfsm_dissect(tl, u_int32_t *, 2239 3 * NFSX_UNSIGNED); 2240 fileno = fxdr_hyper(tl); 2241 len = fxdr_unsigned(int, *(tl + 2)); 2242 } else { 2243 nfsm_dissect(tl, u_int32_t *, 2244 2 * NFSX_UNSIGNED); 2245 fileno = fxdr_unsigned(u_quad_t, *tl++); 2246 len = fxdr_unsigned(int, *tl); 2247 } 2248 if (len <= 0 || len > NFS_MAXNAMLEN) { 2249 error = EBADRPC; 2250 m_freem(mrep); 2251 goto nfsmout; 2252 } 2253 2254 /* 2255 * len is the number of bytes in the path element 2256 * name, not including the \0 termination. 2257 * 2258 * tlen is the number of bytes w have to reserve for 2259 * the path element name. 2260 */ 2261 tlen = nfsm_rndup(len); 2262 if (tlen == len) 2263 tlen += 4; /* To ensure null termination */ 2264 2265 /* 2266 * If the entry would cross a DIRBLKSIZ boundary, 2267 * extend the previous nfs_dirent to cover the 2268 * remaining space. 2269 */ 2270 left = DIRBLKSIZ - blksiz; 2271 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2272 dp->nfs_reclen += left; 2273 uiop->uio_iov->iov_base += left; 2274 uiop->uio_iov->iov_len -= left; 2275 uiop->uio_offset += left; 2276 uiop->uio_resid -= left; 2277 blksiz = 0; 2278 } 2279 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2280 bigenough = 0; 2281 if (bigenough) { 2282 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2283 dp->nfs_ino = fileno; 2284 dp->nfs_namlen = len; 2285 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2286 dp->nfs_type = DT_UNKNOWN; 2287 blksiz += dp->nfs_reclen; 2288 if (blksiz == DIRBLKSIZ) 2289 blksiz = 0; 2290 uiop->uio_offset += sizeof(struct nfs_dirent); 2291 uiop->uio_resid -= sizeof(struct nfs_dirent); 2292 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2293 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2294 nfsm_mtouio(uiop, len); 2295 2296 /* 2297 * The uiop has advanced by nfs_dirent + len 2298 * but really needs to advance by 2299 * nfs_dirent + tlen 2300 */ 2301 cp = uiop->uio_iov->iov_base; 2302 tlen -= len; 2303 *cp = '\0'; /* null terminate */ 2304 uiop->uio_iov->iov_base += tlen; 2305 uiop->uio_iov->iov_len -= tlen; 2306 uiop->uio_offset += tlen; 2307 uiop->uio_resid -= tlen; 2308 } else { 2309 /* 2310 * NFS strings must be rounded up (nfsm_myouio 2311 * handled that in the bigenough case). 2312 */ 2313 nfsm_adv(nfsm_rndup(len)); 2314 } 2315 if (v3) { 2316 nfsm_dissect(tl, u_int32_t *, 2317 3 * NFSX_UNSIGNED); 2318 } else { 2319 nfsm_dissect(tl, u_int32_t *, 2320 2 * NFSX_UNSIGNED); 2321 } 2322 2323 /* 2324 * If we were able to accomodate the last entry, 2325 * get the cookie for the next one. Otherwise 2326 * hold-over the cookie for the one we were not 2327 * able to accomodate. 2328 */ 2329 if (bigenough) { 2330 cookie.nfsuquad[0] = *tl++; 2331 if (v3) 2332 cookie.nfsuquad[1] = *tl++; 2333 } else if (v3) { 2334 tl += 2; 2335 } else { 2336 tl++; 2337 } 2338 more_dirs = fxdr_unsigned(int, *tl); 2339 } 2340 /* 2341 * If at end of rpc data, get the eof boolean 2342 */ 2343 if (!more_dirs) { 2344 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2345 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2346 } 2347 m_freem(mrep); 2348 } 2349 /* 2350 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2351 * by increasing d_reclen for the last record. 2352 */ 2353 if (blksiz > 0) { 2354 left = DIRBLKSIZ - blksiz; 2355 dp->nfs_reclen += left; 2356 uiop->uio_iov->iov_base += left; 2357 uiop->uio_iov->iov_len -= left; 2358 uiop->uio_offset += left; 2359 uiop->uio_resid -= left; 2360 } 2361 2362 if (bigenough) { 2363 /* 2364 * We hit the end of the directory, update direofoffset. 2365 */ 2366 dnp->n_direofoffset = uiop->uio_offset; 2367 } else { 2368 /* 2369 * There is more to go, insert the link cookie so the 2370 * next block can be read. 2371 */ 2372 if (uiop->uio_resid > 0) 2373 kprintf("EEK! readdirrpc resid > 0\n"); 2374 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2375 *cookiep = cookie; 2376 } 2377 nfsmout: 2378 return (error); 2379 } 2380 2381 /* 2382 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2383 */ 2384 int 2385 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2386 { 2387 int len, left; 2388 struct nfs_dirent *dp; 2389 u_int32_t *tl; 2390 caddr_t cp; 2391 int32_t t1, t2; 2392 struct vnode *newvp; 2393 nfsuint64 *cookiep; 2394 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2395 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2396 nfsuint64 cookie; 2397 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2398 struct nfsnode *dnp = VTONFS(vp), *np; 2399 nfsfh_t *fhp; 2400 u_quad_t fileno; 2401 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2402 int attrflag, fhsize; 2403 struct nchandle nch; 2404 struct nchandle dnch; 2405 struct nlcomponent nlc; 2406 2407 #ifndef nolint 2408 dp = NULL; 2409 #endif 2410 #ifndef DIAGNOSTIC 2411 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2412 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2413 panic("nfs readdirplusrpc bad uio"); 2414 #endif 2415 /* 2416 * Obtain the namecache record for the directory so we have something 2417 * to use as a basis for creating the entries. This function will 2418 * return a held (but not locked) ncp. The ncp may be disconnected 2419 * from the tree and cannot be used for upward traversals, and the 2420 * ncp may be unnamed. Note that other unrelated operations may 2421 * cause the ncp to be named at any time. 2422 */ 2423 cache_fromdvp(vp, NULL, 0, &dnch); 2424 bzero(&nlc, sizeof(nlc)); 2425 newvp = NULLVP; 2426 2427 /* 2428 * If there is no cookie, assume directory was stale. 2429 */ 2430 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2431 if (cookiep) 2432 cookie = *cookiep; 2433 else 2434 return (NFSERR_BAD_COOKIE); 2435 /* 2436 * Loop around doing readdir rpc's of size nm_readdirsize 2437 * truncated to a multiple of DIRBLKSIZ. 2438 * The stopping criteria is EOF or buffer full. 2439 */ 2440 while (more_dirs && bigenough) { 2441 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2442 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2443 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2444 nfsm_fhtom(vp, 1); 2445 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2446 *tl++ = cookie.nfsuquad[0]; 2447 *tl++ = cookie.nfsuquad[1]; 2448 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2449 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2450 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2451 *tl = txdr_unsigned(nmp->nm_rsize); 2452 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2453 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2454 if (error) { 2455 m_freem(mrep); 2456 goto nfsmout; 2457 } 2458 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2459 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2460 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2461 more_dirs = fxdr_unsigned(int, *tl); 2462 2463 /* loop thru the dir entries, doctoring them to 4bsd form */ 2464 while (more_dirs && bigenough) { 2465 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2466 fileno = fxdr_hyper(tl); 2467 len = fxdr_unsigned(int, *(tl + 2)); 2468 if (len <= 0 || len > NFS_MAXNAMLEN) { 2469 error = EBADRPC; 2470 m_freem(mrep); 2471 goto nfsmout; 2472 } 2473 tlen = nfsm_rndup(len); 2474 if (tlen == len) 2475 tlen += 4; /* To ensure null termination*/ 2476 left = DIRBLKSIZ - blksiz; 2477 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2478 dp->nfs_reclen += left; 2479 uiop->uio_iov->iov_base += left; 2480 uiop->uio_iov->iov_len -= left; 2481 uiop->uio_offset += left; 2482 uiop->uio_resid -= left; 2483 blksiz = 0; 2484 } 2485 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2486 bigenough = 0; 2487 if (bigenough) { 2488 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2489 dp->nfs_ino = fileno; 2490 dp->nfs_namlen = len; 2491 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2492 dp->nfs_type = DT_UNKNOWN; 2493 blksiz += dp->nfs_reclen; 2494 if (blksiz == DIRBLKSIZ) 2495 blksiz = 0; 2496 uiop->uio_offset += sizeof(struct nfs_dirent); 2497 uiop->uio_resid -= sizeof(struct nfs_dirent); 2498 uiop->uio_iov->iov_base += sizeof(struct nfs_dirent); 2499 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2500 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2501 nlc.nlc_namelen = len; 2502 nfsm_mtouio(uiop, len); 2503 cp = uiop->uio_iov->iov_base; 2504 tlen -= len; 2505 *cp = '\0'; 2506 uiop->uio_iov->iov_base += tlen; 2507 uiop->uio_iov->iov_len -= tlen; 2508 uiop->uio_offset += tlen; 2509 uiop->uio_resid -= tlen; 2510 } else 2511 nfsm_adv(nfsm_rndup(len)); 2512 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2513 if (bigenough) { 2514 cookie.nfsuquad[0] = *tl++; 2515 cookie.nfsuquad[1] = *tl++; 2516 } else 2517 tl += 2; 2518 2519 /* 2520 * Since the attributes are before the file handle 2521 * (sigh), we must skip over the attributes and then 2522 * come back and get them. 2523 */ 2524 attrflag = fxdr_unsigned(int, *tl); 2525 if (attrflag) { 2526 dpossav1 = dpos; 2527 mdsav1 = md; 2528 nfsm_adv(NFSX_V3FATTR); 2529 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2530 doit = fxdr_unsigned(int, *tl); 2531 if (doit) { 2532 nfsm_getfh(fhp, fhsize, 1); 2533 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2534 vref(vp); 2535 newvp = vp; 2536 np = dnp; 2537 } else { 2538 error = nfs_nget(vp->v_mount, fhp, 2539 fhsize, &np); 2540 if (error) 2541 doit = 0; 2542 else 2543 newvp = NFSTOV(np); 2544 } 2545 } 2546 if (doit && bigenough) { 2547 dpossav2 = dpos; 2548 dpos = dpossav1; 2549 mdsav2 = md; 2550 md = mdsav1; 2551 nfsm_loadattr(newvp, (struct vattr *)0); 2552 dpos = dpossav2; 2553 md = mdsav2; 2554 dp->nfs_type = 2555 IFTODT(VTTOIF(np->n_vattr.va_type)); 2556 if (dnch.ncp) { 2557 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2558 nlc.nlc_namelen, nlc.nlc_namelen, 2559 nlc.nlc_nameptr); 2560 nch = cache_nlookup(&dnch, &nlc); 2561 cache_setunresolved(&nch); 2562 nfs_cache_setvp(&nch, newvp, 2563 nfspos_cache_timeout); 2564 cache_put(&nch); 2565 } else { 2566 kprintf("NFS/READDIRPLUS, UNABLE TO ENTER" 2567 " %*.*s\n", 2568 nlc.nlc_namelen, nlc.nlc_namelen, 2569 nlc.nlc_nameptr); 2570 } 2571 } 2572 } else { 2573 /* Just skip over the file handle */ 2574 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2575 i = fxdr_unsigned(int, *tl); 2576 nfsm_adv(nfsm_rndup(i)); 2577 } 2578 if (newvp != NULLVP) { 2579 if (newvp == vp) 2580 vrele(newvp); 2581 else 2582 vput(newvp); 2583 newvp = NULLVP; 2584 } 2585 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2586 more_dirs = fxdr_unsigned(int, *tl); 2587 } 2588 /* 2589 * If at end of rpc data, get the eof boolean 2590 */ 2591 if (!more_dirs) { 2592 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2593 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2594 } 2595 m_freem(mrep); 2596 } 2597 /* 2598 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2599 * by increasing d_reclen for the last record. 2600 */ 2601 if (blksiz > 0) { 2602 left = DIRBLKSIZ - blksiz; 2603 dp->nfs_reclen += left; 2604 uiop->uio_iov->iov_base += left; 2605 uiop->uio_iov->iov_len -= left; 2606 uiop->uio_offset += left; 2607 uiop->uio_resid -= left; 2608 } 2609 2610 /* 2611 * We are now either at the end of the directory or have filled the 2612 * block. 2613 */ 2614 if (bigenough) 2615 dnp->n_direofoffset = uiop->uio_offset; 2616 else { 2617 if (uiop->uio_resid > 0) 2618 kprintf("EEK! readdirplusrpc resid > 0\n"); 2619 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2620 *cookiep = cookie; 2621 } 2622 nfsmout: 2623 if (newvp != NULLVP) { 2624 if (newvp == vp) 2625 vrele(newvp); 2626 else 2627 vput(newvp); 2628 newvp = NULLVP; 2629 } 2630 if (dnch.ncp) 2631 cache_drop(&dnch); 2632 return (error); 2633 } 2634 2635 /* 2636 * Silly rename. To make the NFS filesystem that is stateless look a little 2637 * more like the "ufs" a remove of an active vnode is translated to a rename 2638 * to a funny looking filename that is removed by nfs_inactive on the 2639 * nfsnode. There is the potential for another process on a different client 2640 * to create the same funny name between the nfs_lookitup() fails and the 2641 * nfs_rename() completes, but... 2642 */ 2643 static int 2644 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2645 { 2646 struct sillyrename *sp; 2647 struct nfsnode *np; 2648 int error; 2649 2650 /* 2651 * We previously purged dvp instead of vp. I don't know why, it 2652 * completely destroys performance. We can't do it anyway with the 2653 * new VFS API since we would be breaking the namecache topology. 2654 */ 2655 cache_purge(vp); /* XXX */ 2656 np = VTONFS(vp); 2657 #ifndef DIAGNOSTIC 2658 if (vp->v_type == VDIR) 2659 panic("nfs: sillyrename dir"); 2660 #endif 2661 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2662 M_NFSREQ, M_WAITOK); 2663 sp->s_cred = crdup(cnp->cn_cred); 2664 sp->s_dvp = dvp; 2665 vref(dvp); 2666 2667 /* Fudge together a funny name */ 2668 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2669 2670 /* Try lookitups until we get one that isn't there */ 2671 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2672 cnp->cn_td, (struct nfsnode **)0) == 0) { 2673 sp->s_name[4]++; 2674 if (sp->s_name[4] > 'z') { 2675 error = EINVAL; 2676 goto bad; 2677 } 2678 } 2679 error = nfs_renameit(dvp, cnp, sp); 2680 if (error) 2681 goto bad; 2682 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2683 cnp->cn_td, &np); 2684 np->n_sillyrename = sp; 2685 return (0); 2686 bad: 2687 vrele(sp->s_dvp); 2688 crfree(sp->s_cred); 2689 kfree((caddr_t)sp, M_NFSREQ); 2690 return (error); 2691 } 2692 2693 /* 2694 * Look up a file name and optionally either update the file handle or 2695 * allocate an nfsnode, depending on the value of npp. 2696 * npp == NULL --> just do the lookup 2697 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2698 * handled too 2699 * *npp != NULL --> update the file handle in the vnode 2700 */ 2701 static int 2702 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2703 struct thread *td, struct nfsnode **npp) 2704 { 2705 u_int32_t *tl; 2706 caddr_t cp; 2707 int32_t t1, t2; 2708 struct vnode *newvp = (struct vnode *)0; 2709 struct nfsnode *np, *dnp = VTONFS(dvp); 2710 caddr_t bpos, dpos, cp2; 2711 int error = 0, fhlen, attrflag; 2712 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2713 nfsfh_t *nfhp; 2714 int v3 = NFS_ISV3(dvp); 2715 2716 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2717 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2718 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2719 nfsm_fhtom(dvp, v3); 2720 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2721 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2722 if (npp && !error) { 2723 nfsm_getfh(nfhp, fhlen, v3); 2724 if (*npp) { 2725 np = *npp; 2726 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2727 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 2728 np->n_fhp = &np->n_fh; 2729 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2730 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 2731 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2732 np->n_fhsize = fhlen; 2733 newvp = NFSTOV(np); 2734 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2735 vref(dvp); 2736 newvp = dvp; 2737 } else { 2738 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2739 if (error) { 2740 m_freem(mrep); 2741 return (error); 2742 } 2743 newvp = NFSTOV(np); 2744 } 2745 if (v3) { 2746 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 2747 if (!attrflag && *npp == NULL) { 2748 m_freem(mrep); 2749 if (newvp == dvp) 2750 vrele(newvp); 2751 else 2752 vput(newvp); 2753 return (ENOENT); 2754 } 2755 } else 2756 nfsm_loadattr(newvp, (struct vattr *)0); 2757 } 2758 m_freem(mrep); 2759 nfsmout: 2760 if (npp && *npp == NULL) { 2761 if (error) { 2762 if (newvp) { 2763 if (newvp == dvp) 2764 vrele(newvp); 2765 else 2766 vput(newvp); 2767 } 2768 } else 2769 *npp = np; 2770 } 2771 return (error); 2772 } 2773 2774 /* 2775 * Nfs Version 3 commit rpc 2776 */ 2777 int 2778 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2779 { 2780 caddr_t cp; 2781 u_int32_t *tl; 2782 int32_t t1, t2; 2783 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2784 caddr_t bpos, dpos, cp2; 2785 int error = 0, wccflag = NFSV3_WCCRATTR; 2786 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2787 2788 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2789 return (0); 2790 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2791 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2792 nfsm_fhtom(vp, 1); 2793 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2794 txdr_hyper(offset, tl); 2795 tl += 2; 2796 *tl = txdr_unsigned(cnt); 2797 nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); 2798 nfsm_wcc_data(vp, wccflag); 2799 if (!error) { 2800 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2801 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2802 NFSX_V3WRITEVERF)) { 2803 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2804 NFSX_V3WRITEVERF); 2805 error = NFSERR_STALEWRITEVERF; 2806 } 2807 } 2808 m_freem(mrep); 2809 nfsmout: 2810 return (error); 2811 } 2812 2813 /* 2814 * Kludge City.. 2815 * - make nfs_bmap() essentially a no-op that does no translation 2816 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2817 * (Maybe I could use the process's page mapping, but I was concerned that 2818 * Kernel Write might not be enabled and also figured copyout() would do 2819 * a lot more work than bcopy() and also it currently happens in the 2820 * context of the swapper process (2). 2821 * 2822 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, 2823 * off_t *a_doffsetp, int *a_runp, int *a_runb) 2824 */ 2825 static int 2826 nfs_bmap(struct vop_bmap_args *ap) 2827 { 2828 if (ap->a_doffsetp != NULL) 2829 *ap->a_doffsetp = ap->a_loffset; 2830 if (ap->a_runp != NULL) 2831 *ap->a_runp = 0; 2832 if (ap->a_runb != NULL) 2833 *ap->a_runb = 0; 2834 return (0); 2835 } 2836 2837 /* 2838 * Strategy routine. 2839 * 2840 * For async requests when nfsiod(s) are running, queue the request by 2841 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2842 * request. 2843 */ 2844 static int 2845 nfs_strategy(struct vop_strategy_args *ap) 2846 { 2847 struct bio *bio = ap->a_bio; 2848 struct bio *nbio; 2849 struct buf *bp = bio->bio_buf; 2850 struct thread *td; 2851 int error = 0; 2852 2853 KASSERT(bp->b_cmd != BUF_CMD_DONE, 2854 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 2855 KASSERT(BUF_REFCNT(bp) > 0, 2856 ("nfs_strategy: buffer %p not locked", bp)); 2857 2858 if (bp->b_flags & B_ASYNC) 2859 td = NULL; 2860 else 2861 td = curthread; /* XXX */ 2862 2863 /* 2864 * We probably don't need to push an nbio any more since no 2865 * block conversion is required due to the use of 64 bit byte 2866 * offsets, but do it anyway. 2867 */ 2868 nbio = push_bio(bio); 2869 nbio->bio_offset = bio->bio_offset; 2870 2871 /* 2872 * If the op is asynchronous and an i/o daemon is waiting 2873 * queue the request, wake it up and wait for completion 2874 * otherwise just do it ourselves. 2875 */ 2876 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(ap->a_vp, nbio, td)) 2877 error = nfs_doio(ap->a_vp, nbio, td); 2878 return (error); 2879 } 2880 2881 /* 2882 * Mmap a file 2883 * 2884 * NB Currently unsupported. 2885 * 2886 * nfs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred) 2887 */ 2888 /* ARGSUSED */ 2889 static int 2890 nfs_mmap(struct vop_mmap_args *ap) 2891 { 2892 return (EINVAL); 2893 } 2894 2895 /* 2896 * fsync vnode op. Just call nfs_flush() with commit == 1. 2897 * 2898 * nfs_fsync(struct vnode *a_vp, int a_waitfor) 2899 */ 2900 /* ARGSUSED */ 2901 static int 2902 nfs_fsync(struct vop_fsync_args *ap) 2903 { 2904 return (nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1)); 2905 } 2906 2907 /* 2908 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 2909 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 2910 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 2911 * set the buffer contains data that has already been written to the server 2912 * and which now needs a commit RPC. 2913 * 2914 * If commit is 0 we only take one pass and only flush buffers containing new 2915 * dirty data. 2916 * 2917 * If commit is 1 we take two passes, issuing a commit RPC in the second 2918 * pass. 2919 * 2920 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 2921 * to completely flush all pending data. 2922 * 2923 * Note that the RB_SCAN code properly handles the case where the 2924 * callback might block and directly or indirectly (another thread) cause 2925 * the RB tree to change. 2926 */ 2927 2928 #ifndef NFS_COMMITBVECSIZ 2929 #define NFS_COMMITBVECSIZ 16 2930 #endif 2931 2932 struct nfs_flush_info { 2933 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 2934 struct thread *td; 2935 struct vnode *vp; 2936 int waitfor; 2937 int slpflag; 2938 int slptimeo; 2939 int loops; 2940 struct buf *bvary[NFS_COMMITBVECSIZ]; 2941 int bvsize; 2942 off_t beg_off; 2943 off_t end_off; 2944 }; 2945 2946 static int nfs_flush_bp(struct buf *bp, void *data); 2947 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 2948 2949 int 2950 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 2951 { 2952 struct nfsnode *np = VTONFS(vp); 2953 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2954 struct nfs_flush_info info; 2955 int error; 2956 2957 bzero(&info, sizeof(info)); 2958 info.td = td; 2959 info.vp = vp; 2960 info.waitfor = waitfor; 2961 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 2962 info.loops = 0; 2963 2964 do { 2965 /* 2966 * Flush mode 2967 */ 2968 info.mode = NFI_FLUSHNEW; 2969 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2970 nfs_flush_bp, &info); 2971 2972 /* 2973 * Take a second pass if committing and no error occured. 2974 * Clean up any left over collection (whether an error 2975 * occurs or not). 2976 */ 2977 if (commit && error == 0) { 2978 info.mode = NFI_COMMIT; 2979 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2980 nfs_flush_bp, &info); 2981 if (info.bvsize) 2982 error = nfs_flush_docommit(&info, error); 2983 } 2984 2985 /* 2986 * Wait for pending I/O to complete before checking whether 2987 * any further dirty buffers exist. 2988 */ 2989 while (waitfor == MNT_WAIT && vp->v_track_write.bk_active) { 2990 vp->v_track_write.bk_waitflag = 1; 2991 error = tsleep(&vp->v_track_write, 2992 info.slpflag, "nfsfsync", info.slptimeo); 2993 if (error) { 2994 /* 2995 * We have to be able to break out if this 2996 * is an 'intr' mount. 2997 */ 2998 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2999 error = -EINTR; 3000 break; 3001 } 3002 3003 /* 3004 * Since we do not process pending signals, 3005 * once we get a PCATCH our tsleep() will no 3006 * longer sleep, switch to a fixed timeout 3007 * instead. 3008 */ 3009 if (info.slpflag == PCATCH) { 3010 info.slpflag = 0; 3011 info.slptimeo = 2 * hz; 3012 } 3013 error = 0; 3014 } 3015 } 3016 ++info.loops; 3017 /* 3018 * Loop if we are flushing synchronous as well as committing, 3019 * and dirty buffers are still present. Otherwise we might livelock. 3020 */ 3021 } while (waitfor == MNT_WAIT && commit && 3022 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 3023 3024 /* 3025 * The callbacks have to return a negative error to terminate the 3026 * RB scan. 3027 */ 3028 if (error < 0) 3029 error = -error; 3030 3031 /* 3032 * Deal with any error collection 3033 */ 3034 if (np->n_flag & NWRITEERR) { 3035 error = np->n_error; 3036 np->n_flag &= ~NWRITEERR; 3037 } 3038 return (error); 3039 } 3040 3041 3042 static 3043 int 3044 nfs_flush_bp(struct buf *bp, void *data) 3045 { 3046 struct nfs_flush_info *info = data; 3047 off_t toff; 3048 int error; 3049 3050 error = 0; 3051 switch(info->mode) { 3052 case NFI_FLUSHNEW: 3053 crit_enter(); 3054 if (info->loops && info->waitfor == MNT_WAIT) { 3055 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3056 if (error) { 3057 int lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3058 if (info->slpflag & PCATCH) 3059 lkflags |= LK_PCATCH; 3060 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3061 info->slptimeo); 3062 } 3063 } else { 3064 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3065 } 3066 if (error == 0) { 3067 KKASSERT(bp->b_vp == info->vp); 3068 3069 if ((bp->b_flags & B_DELWRI) == 0) 3070 panic("nfs_fsync: not dirty"); 3071 if (bp->b_flags & B_NEEDCOMMIT) { 3072 BUF_UNLOCK(bp); 3073 crit_exit(); 3074 break; 3075 } 3076 bremfree(bp); 3077 3078 crit_exit(); 3079 bawrite(bp); 3080 } else { 3081 crit_exit(); 3082 error = 0; 3083 } 3084 break; 3085 case NFI_COMMIT: 3086 /* 3087 * Only process buffers in need of a commit which we can 3088 * immediately lock. This may prevent a buffer from being 3089 * committed, but the normal flush loop will block on the 3090 * same buffer so we shouldn't get into an endless loop. 3091 */ 3092 crit_enter(); 3093 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3094 (B_DELWRI | B_NEEDCOMMIT) || 3095 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 3096 crit_exit(); 3097 break; 3098 } 3099 3100 KKASSERT(bp->b_vp == info->vp); 3101 bremfree(bp); 3102 3103 /* 3104 * NOTE: storing the bp in the bvary[] basically sets 3105 * it up for a commit operation. 3106 * 3107 * We must call vfs_busy_pages() now so the commit operation 3108 * is interlocked with user modifications to memory mapped 3109 * pages. 3110 * 3111 * Note: to avoid loopback deadlocks, we do not 3112 * assign b_runningbufspace. 3113 */ 3114 bp->b_cmd = BUF_CMD_WRITE; 3115 vfs_busy_pages(bp->b_vp, bp); 3116 info->bvary[info->bvsize] = bp; 3117 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3118 if (info->bvsize == 0 || toff < info->beg_off) 3119 info->beg_off = toff; 3120 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3121 if (info->bvsize == 0 || toff > info->end_off) 3122 info->end_off = toff; 3123 ++info->bvsize; 3124 if (info->bvsize == NFS_COMMITBVECSIZ) { 3125 error = nfs_flush_docommit(info, 0); 3126 KKASSERT(info->bvsize == 0); 3127 } 3128 crit_exit(); 3129 } 3130 return (error); 3131 } 3132 3133 static 3134 int 3135 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3136 { 3137 struct vnode *vp; 3138 struct buf *bp; 3139 off_t bytes; 3140 int retv; 3141 int i; 3142 3143 vp = info->vp; 3144 3145 if (info->bvsize > 0) { 3146 /* 3147 * Commit data on the server, as required. Note that 3148 * nfs_commit will use the vnode's cred for the commit. 3149 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3150 */ 3151 bytes = info->end_off - info->beg_off; 3152 if (bytes > 0x40000000) 3153 bytes = 0x40000000; 3154 if (error) { 3155 retv = -error; 3156 } else { 3157 retv = nfs_commit(vp, info->beg_off, 3158 (int)bytes, info->td); 3159 if (retv == NFSERR_STALEWRITEVERF) 3160 nfs_clearcommit(vp->v_mount); 3161 } 3162 3163 /* 3164 * Now, either mark the blocks I/O done or mark the 3165 * blocks dirty, depending on whether the commit 3166 * succeeded. 3167 */ 3168 for (i = 0; i < info->bvsize; ++i) { 3169 bp = info->bvary[i]; 3170 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3171 if (retv) { 3172 /* 3173 * Error, leave B_DELWRI intact 3174 */ 3175 vfs_unbusy_pages(bp); 3176 bp->b_cmd = BUF_CMD_DONE; 3177 brelse(bp); 3178 } else { 3179 /* 3180 * Success, remove B_DELWRI ( bundirty() ). 3181 * 3182 * b_dirtyoff/b_dirtyend seem to be NFS 3183 * specific. We should probably move that 3184 * into bundirty(). XXX 3185 * 3186 * We are faking an I/O write, we have to 3187 * start the transaction in order to 3188 * immediately biodone() it. 3189 */ 3190 crit_enter(); 3191 bp->b_flags |= B_ASYNC; 3192 bundirty(bp); 3193 bp->b_flags &= ~B_ERROR; 3194 bp->b_dirtyoff = bp->b_dirtyend = 0; 3195 crit_exit(); 3196 biodone(&bp->b_bio1); 3197 } 3198 } 3199 info->bvsize = 0; 3200 } 3201 return (error); 3202 } 3203 3204 /* 3205 * NFS advisory byte-level locks. 3206 * Currently unsupported. 3207 * 3208 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3209 * int a_flags) 3210 */ 3211 static int 3212 nfs_advlock(struct vop_advlock_args *ap) 3213 { 3214 struct nfsnode *np = VTONFS(ap->a_vp); 3215 3216 /* 3217 * The following kludge is to allow diskless support to work 3218 * until a real NFS lockd is implemented. Basically, just pretend 3219 * that this is a local lock. 3220 */ 3221 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3222 } 3223 3224 /* 3225 * Print out the contents of an nfsnode. 3226 * 3227 * nfs_print(struct vnode *a_vp) 3228 */ 3229 static int 3230 nfs_print(struct vop_print_args *ap) 3231 { 3232 struct vnode *vp = ap->a_vp; 3233 struct nfsnode *np = VTONFS(vp); 3234 3235 kprintf("tag VT_NFS, fileid %lld fsid 0x%x", 3236 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3237 if (vp->v_type == VFIFO) 3238 fifo_printinfo(vp); 3239 kprintf("\n"); 3240 return (0); 3241 } 3242 3243 /* 3244 * nfs special file access vnode op. 3245 * Essentially just get vattr and then imitate iaccess() since the device is 3246 * local to the client. 3247 * 3248 * nfsspec_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 3249 */ 3250 static int 3251 nfsspec_access(struct vop_access_args *ap) 3252 { 3253 struct vattr *vap; 3254 gid_t *gp; 3255 struct ucred *cred = ap->a_cred; 3256 struct vnode *vp = ap->a_vp; 3257 mode_t mode = ap->a_mode; 3258 struct vattr vattr; 3259 int i; 3260 int error; 3261 3262 /* 3263 * Disallow write attempts on filesystems mounted read-only; 3264 * unless the file is a socket, fifo, or a block or character 3265 * device resident on the filesystem. 3266 */ 3267 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3268 switch (vp->v_type) { 3269 case VREG: 3270 case VDIR: 3271 case VLNK: 3272 return (EROFS); 3273 default: 3274 break; 3275 } 3276 } 3277 /* 3278 * If you're the super-user, 3279 * you always get access. 3280 */ 3281 if (cred->cr_uid == 0) 3282 return (0); 3283 vap = &vattr; 3284 error = VOP_GETATTR(vp, vap); 3285 if (error) 3286 return (error); 3287 /* 3288 * Access check is based on only one of owner, group, public. 3289 * If not owner, then check group. If not a member of the 3290 * group, then check public access. 3291 */ 3292 if (cred->cr_uid != vap->va_uid) { 3293 mode >>= 3; 3294 gp = cred->cr_groups; 3295 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3296 if (vap->va_gid == *gp) 3297 goto found; 3298 mode >>= 3; 3299 found: 3300 ; 3301 } 3302 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3303 return (error); 3304 } 3305 3306 /* 3307 * Read wrapper for special devices. 3308 * 3309 * nfsspec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3310 * struct ucred *a_cred) 3311 */ 3312 static int 3313 nfsspec_read(struct vop_read_args *ap) 3314 { 3315 struct nfsnode *np = VTONFS(ap->a_vp); 3316 3317 /* 3318 * Set access flag. 3319 */ 3320 np->n_flag |= NACC; 3321 getnanotime(&np->n_atim); 3322 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3323 } 3324 3325 /* 3326 * Write wrapper for special devices. 3327 * 3328 * nfsspec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3329 * struct ucred *a_cred) 3330 */ 3331 static int 3332 nfsspec_write(struct vop_write_args *ap) 3333 { 3334 struct nfsnode *np = VTONFS(ap->a_vp); 3335 3336 /* 3337 * Set update flag. 3338 */ 3339 np->n_flag |= NUPD; 3340 getnanotime(&np->n_mtim); 3341 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3342 } 3343 3344 /* 3345 * Close wrapper for special devices. 3346 * 3347 * Update the times on the nfsnode then do device close. 3348 * 3349 * nfsspec_close(struct vnode *a_vp, int a_fflag) 3350 */ 3351 static int 3352 nfsspec_close(struct vop_close_args *ap) 3353 { 3354 struct vnode *vp = ap->a_vp; 3355 struct nfsnode *np = VTONFS(vp); 3356 struct vattr vattr; 3357 3358 if (np->n_flag & (NACC | NUPD)) { 3359 np->n_flag |= NCHG; 3360 if (vp->v_sysref.refcnt == 1 && 3361 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3362 VATTR_NULL(&vattr); 3363 if (np->n_flag & NACC) 3364 vattr.va_atime = np->n_atim; 3365 if (np->n_flag & NUPD) 3366 vattr.va_mtime = np->n_mtim; 3367 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3368 } 3369 } 3370 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3371 } 3372 3373 /* 3374 * Read wrapper for fifos. 3375 * 3376 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3377 * struct ucred *a_cred) 3378 */ 3379 static int 3380 nfsfifo_read(struct vop_read_args *ap) 3381 { 3382 struct nfsnode *np = VTONFS(ap->a_vp); 3383 3384 /* 3385 * Set access flag. 3386 */ 3387 np->n_flag |= NACC; 3388 getnanotime(&np->n_atim); 3389 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3390 } 3391 3392 /* 3393 * Write wrapper for fifos. 3394 * 3395 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3396 * struct ucred *a_cred) 3397 */ 3398 static int 3399 nfsfifo_write(struct vop_write_args *ap) 3400 { 3401 struct nfsnode *np = VTONFS(ap->a_vp); 3402 3403 /* 3404 * Set update flag. 3405 */ 3406 np->n_flag |= NUPD; 3407 getnanotime(&np->n_mtim); 3408 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3409 } 3410 3411 /* 3412 * Close wrapper for fifos. 3413 * 3414 * Update the times on the nfsnode then do fifo close. 3415 * 3416 * nfsfifo_close(struct vnode *a_vp, int a_fflag) 3417 */ 3418 static int 3419 nfsfifo_close(struct vop_close_args *ap) 3420 { 3421 struct vnode *vp = ap->a_vp; 3422 struct nfsnode *np = VTONFS(vp); 3423 struct vattr vattr; 3424 struct timespec ts; 3425 3426 if (np->n_flag & (NACC | NUPD)) { 3427 getnanotime(&ts); 3428 if (np->n_flag & NACC) 3429 np->n_atim = ts; 3430 if (np->n_flag & NUPD) 3431 np->n_mtim = ts; 3432 np->n_flag |= NCHG; 3433 if (vp->v_sysref.refcnt == 1 && 3434 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3435 VATTR_NULL(&vattr); 3436 if (np->n_flag & NACC) 3437 vattr.va_atime = np->n_atim; 3438 if (np->n_flag & NUPD) 3439 vattr.va_mtime = np->n_mtim; 3440 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3441 } 3442 } 3443 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3444 } 3445 3446