1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 37 * $FreeBSD: src/sys/nfs/nfs_vnops.c,v 1.150.2.5 2001/12/20 19:56:28 dillon Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_vnops.c,v 1.80 2008/10/18 01:13:54 dillon Exp $ 39 */ 40 41 42 /* 43 * vnode op calls for Sun NFS version 2 and 3 44 */ 45 46 #include "opt_inet.h" 47 48 #include <sys/param.h> 49 #include <sys/kernel.h> 50 #include <sys/systm.h> 51 #include <sys/resourcevar.h> 52 #include <sys/proc.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/malloc.h> 56 #include <sys/mbuf.h> 57 #include <sys/namei.h> 58 #include <sys/nlookup.h> 59 #include <sys/socket.h> 60 #include <sys/vnode.h> 61 #include <sys/dirent.h> 62 #include <sys/fcntl.h> 63 #include <sys/lockf.h> 64 #include <sys/stat.h> 65 #include <sys/sysctl.h> 66 #include <sys/conf.h> 67 68 #include <vm/vm.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_zone.h> 71 72 #include <sys/buf2.h> 73 74 #include <vfs/fifofs/fifo.h> 75 #include <vfs/ufs/dir.h> 76 77 #undef DIRBLKSIZ 78 79 #include "rpcv2.h" 80 #include "nfsproto.h" 81 #include "nfs.h" 82 #include "nfsmount.h" 83 #include "nfsnode.h" 84 #include "xdr_subs.h" 85 #include "nfsm_subs.h" 86 87 #include <net/if.h> 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 91 #include <sys/thread2.h> 92 93 /* Defs */ 94 #define TRUE 1 95 #define FALSE 0 96 97 static int 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 static int nfs_flush_on_hlink = 0; 233 SYSCTL_INT(_vfs_nfs, OID_AUTO, flush_on_hlink, CTLFLAG_RW, 234 &nfs_flush_on_hlink, 0, "flush fvp prior to hard link"); 235 236 static int nfsaccess_cache_timeout = NFS_DEFATTRTIMO; 237 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 238 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 239 240 static int nfsneg_cache_timeout = NFS_MINATTRTIMO; 241 SYSCTL_INT(_vfs_nfs, OID_AUTO, neg_cache_timeout, CTLFLAG_RW, 242 &nfsneg_cache_timeout, 0, "NFS NEGATIVE NAMECACHE timeout"); 243 244 static int nfspos_cache_timeout = NFS_MINATTRTIMO; 245 SYSCTL_INT(_vfs_nfs, OID_AUTO, pos_cache_timeout, CTLFLAG_RW, 246 &nfspos_cache_timeout, 0, "NFS POSITIVE NAMECACHE timeout"); 247 248 static int nfsv3_commit_on_close = 0; 249 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 250 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 251 #if 0 252 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 253 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 254 255 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 256 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 257 #endif 258 259 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 260 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 261 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 262 static int 263 nfs3_access_otw(struct vnode *vp, int wmode, 264 struct thread *td, struct ucred *cred) 265 { 266 const int v3 = 1; 267 u_int32_t *tl; 268 int error = 0, attrflag; 269 270 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 271 caddr_t bpos, dpos, cp2; 272 int32_t t1, t2; 273 caddr_t cp; 274 u_int32_t rmode; 275 struct nfsnode *np = VTONFS(vp); 276 277 nfsstats.rpccnt[NFSPROC_ACCESS]++; 278 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 279 nfsm_fhtom(vp, v3); 280 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 281 *tl = txdr_unsigned(wmode); 282 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 283 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 284 if (!error) { 285 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 286 rmode = fxdr_unsigned(u_int32_t, *tl); 287 np->n_mode = rmode; 288 np->n_modeuid = cred->cr_uid; 289 np->n_modestamp = mycpu->gd_time_seconds; 290 } 291 m_freem(mrep); 292 nfsmout: 293 return error; 294 } 295 296 /* 297 * nfs access vnode op. 298 * For nfs version 2, just return ok. File accesses may fail later. 299 * For nfs version 3, use the access rpc to check accessibility. If file modes 300 * are changed on the server, accesses might still fail later. 301 * 302 * nfs_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 303 */ 304 static int 305 nfs_access(struct vop_access_args *ap) 306 { 307 struct vnode *vp = ap->a_vp; 308 thread_t td = curthread; 309 int error = 0; 310 u_int32_t mode, wmode; 311 int v3 = NFS_ISV3(vp); 312 struct nfsnode *np = VTONFS(vp); 313 314 /* 315 * Disallow write attempts on filesystems mounted read-only; 316 * unless the file is a socket, fifo, or a block or character 317 * device resident on the filesystem. 318 */ 319 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 320 switch (vp->v_type) { 321 case VREG: 322 case VDIR: 323 case VLNK: 324 return (EROFS); 325 default: 326 break; 327 } 328 } 329 /* 330 * For nfs v3, check to see if we have done this recently, and if 331 * so return our cached result instead of making an ACCESS call. 332 * If not, do an access rpc, otherwise you are stuck emulating 333 * ufs_access() locally using the vattr. This may not be correct, 334 * since the server may apply other access criteria such as 335 * client uid-->server uid mapping that we do not know about. 336 */ 337 if (v3) { 338 if (ap->a_mode & VREAD) 339 mode = NFSV3ACCESS_READ; 340 else 341 mode = 0; 342 if (vp->v_type != VDIR) { 343 if (ap->a_mode & VWRITE) 344 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 345 if (ap->a_mode & VEXEC) 346 mode |= NFSV3ACCESS_EXECUTE; 347 } else { 348 if (ap->a_mode & VWRITE) 349 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 350 NFSV3ACCESS_DELETE); 351 if (ap->a_mode & VEXEC) 352 mode |= NFSV3ACCESS_LOOKUP; 353 } 354 /* XXX safety belt, only make blanket request if caching */ 355 if (nfsaccess_cache_timeout > 0) { 356 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 357 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 358 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 359 } else { 360 wmode = mode; 361 } 362 363 /* 364 * Does our cached result allow us to give a definite yes to 365 * this request? 366 */ 367 if (np->n_modestamp && 368 (mycpu->gd_time_seconds < (np->n_modestamp + nfsaccess_cache_timeout)) && 369 (ap->a_cred->cr_uid == np->n_modeuid) && 370 ((np->n_mode & mode) == mode)) { 371 nfsstats.accesscache_hits++; 372 } else { 373 /* 374 * Either a no, or a don't know. Go to the wire. 375 */ 376 nfsstats.accesscache_misses++; 377 error = nfs3_access_otw(vp, wmode, td, ap->a_cred); 378 if (!error) { 379 if ((np->n_mode & mode) != mode) { 380 error = EACCES; 381 } 382 } 383 } 384 } else { 385 if ((error = nfsspec_access(ap)) != 0) 386 return (error); 387 388 /* 389 * Attempt to prevent a mapped root from accessing a file 390 * which it shouldn't. We try to read a byte from the file 391 * if the user is root and the file is not zero length. 392 * After calling nfsspec_access, we should have the correct 393 * file size cached. 394 */ 395 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 396 && VTONFS(vp)->n_size > 0) { 397 struct iovec aiov; 398 struct uio auio; 399 char buf[1]; 400 401 aiov.iov_base = buf; 402 aiov.iov_len = 1; 403 auio.uio_iov = &aiov; 404 auio.uio_iovcnt = 1; 405 auio.uio_offset = 0; 406 auio.uio_resid = 1; 407 auio.uio_segflg = UIO_SYSSPACE; 408 auio.uio_rw = UIO_READ; 409 auio.uio_td = td; 410 411 if (vp->v_type == VREG) { 412 error = nfs_readrpc(vp, &auio); 413 } else if (vp->v_type == VDIR) { 414 char* bp; 415 bp = kmalloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 416 aiov.iov_base = bp; 417 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 418 error = nfs_readdirrpc(vp, &auio); 419 kfree(bp, M_TEMP); 420 } else if (vp->v_type == VLNK) { 421 error = nfs_readlinkrpc(vp, &auio); 422 } else { 423 error = EACCES; 424 } 425 } 426 } 427 /* 428 * [re]record creds for reading and/or writing if access 429 * was granted. Assume the NFS server will grant read access 430 * for execute requests. 431 */ 432 if (error == 0) { 433 if ((ap->a_mode & (VREAD|VEXEC)) && ap->a_cred != np->n_rucred) { 434 crhold(ap->a_cred); 435 if (np->n_rucred) 436 crfree(np->n_rucred); 437 np->n_rucred = ap->a_cred; 438 } 439 if ((ap->a_mode & VWRITE) && ap->a_cred != np->n_wucred) { 440 crhold(ap->a_cred); 441 if (np->n_wucred) 442 crfree(np->n_wucred); 443 np->n_wucred = ap->a_cred; 444 } 445 } 446 return(error); 447 } 448 449 /* 450 * nfs open vnode op 451 * Check to see if the type is ok 452 * and that deletion is not in progress. 453 * For paged in text files, you will need to flush the page cache 454 * if consistency is lost. 455 * 456 * nfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, 457 * struct file *a_fp) 458 */ 459 /* ARGSUSED */ 460 static int 461 nfs_open(struct vop_open_args *ap) 462 { 463 struct vnode *vp = ap->a_vp; 464 struct nfsnode *np = VTONFS(vp); 465 struct vattr vattr; 466 int error; 467 468 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 469 #ifdef DIAGNOSTIC 470 kprintf("open eacces vtyp=%d\n",vp->v_type); 471 #endif 472 return (EOPNOTSUPP); 473 } 474 475 /* 476 * Save valid creds for reading and writing for later RPCs. 477 */ 478 if ((ap->a_mode & FREAD) && ap->a_cred != np->n_rucred) { 479 crhold(ap->a_cred); 480 if (np->n_rucred) 481 crfree(np->n_rucred); 482 np->n_rucred = ap->a_cred; 483 } 484 if ((ap->a_mode & FWRITE) && ap->a_cred != np->n_wucred) { 485 crhold(ap->a_cred); 486 if (np->n_wucred) 487 crfree(np->n_wucred); 488 np->n_wucred = ap->a_cred; 489 } 490 491 /* 492 * Clear the attribute cache only if opening with write access. It 493 * is unclear if we should do this at all here, but we certainly 494 * should not clear the cache unconditionally simply because a file 495 * is being opened. 496 */ 497 if (ap->a_mode & FWRITE) 498 np->n_attrstamp = 0; 499 500 /* 501 * For normal NFS, reconcile changes made locally verses 502 * changes made remotely. Note that VOP_GETATTR only goes 503 * to the wire if the cached attribute has timed out or been 504 * cleared. 505 * 506 * If local modifications have been made clear the attribute 507 * cache to force an attribute and modified time check. If 508 * GETATTR detects that the file has been changed by someone 509 * other then us it will set NRMODIFIED. 510 * 511 * If we are opening a directory and local changes have been 512 * made we have to invalidate the cache in order to ensure 513 * that we get the most up-to-date information from the 514 * server. XXX 515 */ 516 if (np->n_flag & NLMODIFIED) { 517 np->n_attrstamp = 0; 518 if (vp->v_type == VDIR) { 519 error = nfs_vinvalbuf(vp, V_SAVE, 1); 520 if (error == EINTR) 521 return (error); 522 nfs_invaldir(vp); 523 } 524 } 525 error = VOP_GETATTR(vp, &vattr); 526 if (error) 527 return (error); 528 if (np->n_flag & NRMODIFIED) { 529 if (vp->v_type == VDIR) 530 nfs_invaldir(vp); 531 error = nfs_vinvalbuf(vp, V_SAVE, 1); 532 if (error == EINTR) 533 return (error); 534 np->n_flag &= ~NRMODIFIED; 535 } 536 537 return (vop_stdopen(ap)); 538 } 539 540 /* 541 * nfs close vnode op 542 * What an NFS client should do upon close after writing is a debatable issue. 543 * Most NFS clients push delayed writes to the server upon close, basically for 544 * two reasons: 545 * 1 - So that any write errors may be reported back to the client process 546 * doing the close system call. By far the two most likely errors are 547 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 548 * 2 - To put a worst case upper bound on cache inconsistency between 549 * multiple clients for the file. 550 * There is also a consistency problem for Version 2 of the protocol w.r.t. 551 * not being able to tell if other clients are writing a file concurrently, 552 * since there is no way of knowing if the changed modify time in the reply 553 * is only due to the write for this client. 554 * (NFS Version 3 provides weak cache consistency data in the reply that 555 * should be sufficient to detect and handle this case.) 556 * 557 * The current code does the following: 558 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 559 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 560 * or commit them (this satisfies 1 and 2 except for the 561 * case where the server crashes after this close but 562 * before the commit RPC, which is felt to be "good 563 * enough". Changing the last argument to nfs_flush() to 564 * a 1 would force a commit operation, if it is felt a 565 * commit is necessary now. 566 * for NQNFS - do nothing now, since 2 is dealt with via leases and 567 * 1 should be dealt with via an fsync() system call for 568 * cases where write errors are important. 569 * 570 * nfs_close(struct vnode *a_vp, int a_fflag) 571 */ 572 /* ARGSUSED */ 573 static int 574 nfs_close(struct vop_close_args *ap) 575 { 576 struct vnode *vp = ap->a_vp; 577 struct nfsnode *np = VTONFS(vp); 578 int error = 0; 579 thread_t td = curthread; 580 581 if (vp->v_type == VREG) { 582 if (np->n_flag & NLMODIFIED) { 583 if (NFS_ISV3(vp)) { 584 /* 585 * Under NFSv3 we have dirty buffers to dispose of. We 586 * must flush them to the NFS server. We have the option 587 * of waiting all the way through the commit rpc or just 588 * waiting for the initial write. The default is to only 589 * wait through the initial write so the data is in the 590 * server's cache, which is roughly similar to the state 591 * a standard disk subsystem leaves the file in on close(). 592 * 593 * We cannot clear the NLMODIFIED bit in np->n_flag due to 594 * potential races with other processes, and certainly 595 * cannot clear it if we don't commit. 596 */ 597 int cm = nfsv3_commit_on_close ? 1 : 0; 598 error = nfs_flush(vp, MNT_WAIT, td, cm); 599 /* np->n_flag &= ~NLMODIFIED; */ 600 } else { 601 error = nfs_vinvalbuf(vp, V_SAVE, 1); 602 } 603 np->n_attrstamp = 0; 604 } 605 if (np->n_flag & NWRITEERR) { 606 np->n_flag &= ~NWRITEERR; 607 error = np->n_error; 608 } 609 } 610 vop_stdclose(ap); 611 return (error); 612 } 613 614 /* 615 * nfs getattr call from vfs. 616 * 617 * nfs_getattr(struct vnode *a_vp, struct vattr *a_vap) 618 */ 619 static int 620 nfs_getattr(struct vop_getattr_args *ap) 621 { 622 struct vnode *vp = ap->a_vp; 623 struct nfsnode *np = VTONFS(vp); 624 caddr_t cp; 625 u_int32_t *tl; 626 int32_t t1, t2; 627 caddr_t bpos, dpos; 628 int error = 0; 629 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 630 int v3 = NFS_ISV3(vp); 631 thread_t td = curthread; 632 633 /* 634 * Update local times for special files. 635 */ 636 if (np->n_flag & (NACC | NUPD)) 637 np->n_flag |= NCHG; 638 /* 639 * First look in the cache. 640 */ 641 if (nfs_getattrcache(vp, ap->a_vap) == 0) 642 return (0); 643 644 if (v3 && nfsaccess_cache_timeout > 0) { 645 nfsstats.accesscache_misses++; 646 nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, nfs_vpcred(vp, ND_CHECK)); 647 if (nfs_getattrcache(vp, ap->a_vap) == 0) 648 return (0); 649 } 650 651 nfsstats.rpccnt[NFSPROC_GETATTR]++; 652 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 653 nfsm_fhtom(vp, v3); 654 nfsm_request(vp, NFSPROC_GETATTR, td, nfs_vpcred(vp, ND_CHECK)); 655 if (!error) { 656 nfsm_loadattr(vp, ap->a_vap); 657 } 658 m_freem(mrep); 659 nfsmout: 660 return (error); 661 } 662 663 /* 664 * nfs setattr call. 665 * 666 * nfs_setattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred) 667 */ 668 static int 669 nfs_setattr(struct vop_setattr_args *ap) 670 { 671 struct vnode *vp = ap->a_vp; 672 struct nfsnode *np = VTONFS(vp); 673 struct vattr *vap = ap->a_vap; 674 int error = 0; 675 u_quad_t tsize; 676 thread_t td = curthread; 677 678 #ifndef nolint 679 tsize = (u_quad_t)0; 680 #endif 681 682 /* 683 * Setting of flags is not supported. 684 */ 685 if (vap->va_flags != VNOVAL) 686 return (EOPNOTSUPP); 687 688 /* 689 * Disallow write attempts if the filesystem is mounted read-only. 690 */ 691 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 692 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 693 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 694 (vp->v_mount->mnt_flag & MNT_RDONLY)) 695 return (EROFS); 696 697 if (vap->va_size != VNOVAL) { 698 /* 699 * truncation requested 700 */ 701 switch (vp->v_type) { 702 case VDIR: 703 return (EISDIR); 704 case VCHR: 705 case VBLK: 706 case VSOCK: 707 case VFIFO: 708 if (vap->va_mtime.tv_sec == VNOVAL && 709 vap->va_atime.tv_sec == VNOVAL && 710 vap->va_mode == (mode_t)VNOVAL && 711 vap->va_uid == (uid_t)VNOVAL && 712 vap->va_gid == (gid_t)VNOVAL) 713 return (0); 714 vap->va_size = VNOVAL; 715 break; 716 default: 717 /* 718 * Disallow write attempts if the filesystem is 719 * mounted read-only. 720 */ 721 if (vp->v_mount->mnt_flag & MNT_RDONLY) 722 return (EROFS); 723 724 /* 725 * This is nasty. The RPCs we send to flush pending 726 * data often return attribute information which is 727 * cached via a callback to nfs_loadattrcache(), which 728 * has the effect of changing our notion of the file 729 * size. Due to flushed appends and other operations 730 * the file size can be set to virtually anything, 731 * including values that do not match either the old 732 * or intended file size. 733 * 734 * When this condition is detected we must loop to 735 * try the operation again. Hopefully no more 736 * flushing is required on the loop so it works the 737 * second time around. THIS CASE ALMOST ALWAYS 738 * HAPPENS! 739 */ 740 tsize = np->n_size; 741 again: 742 error = nfs_meta_setsize(vp, td, vap->va_size); 743 744 if (np->n_flag & NLMODIFIED) { 745 if (vap->va_size == 0) 746 error = nfs_vinvalbuf(vp, 0, 1); 747 else 748 error = nfs_vinvalbuf(vp, V_SAVE, 1); 749 } 750 /* 751 * note: this loop case almost always happens at 752 * least once per truncation. 753 */ 754 if (error == 0 && np->n_size != vap->va_size) 755 goto again; 756 np->n_vattr.va_size = vap->va_size; 757 break; 758 } 759 } else if ((np->n_flag & NLMODIFIED) && vp->v_type == VREG) { 760 /* 761 * What to do. If we are modifying the mtime we lose 762 * mtime detection of changes made by the server or other 763 * clients. But programs like rsync/rdist/cpdup are going 764 * to call utimes a lot. We don't want to piecemeal sync. 765 * 766 * For now sync if any prior remote changes were detected, 767 * but allow us to lose track of remote changes made during 768 * the utimes operation. 769 */ 770 if (np->n_flag & NRMODIFIED) 771 error = nfs_vinvalbuf(vp, V_SAVE, 1); 772 if (error == EINTR) 773 return (error); 774 if (error == 0) { 775 if (vap->va_mtime.tv_sec != VNOVAL) { 776 np->n_mtime = vap->va_mtime.tv_sec; 777 } 778 } 779 } 780 error = nfs_setattrrpc(vp, vap, ap->a_cred, td); 781 782 /* 783 * Sanity check if a truncation was issued. This should only occur 784 * if multiple processes are racing on the same file. 785 */ 786 if (error == 0 && vap->va_size != VNOVAL && 787 np->n_size != vap->va_size) { 788 kprintf("NFS ftruncate: server disagrees on the file size: " 789 "%lld/%lld/%lld\n", 790 (long long)tsize, 791 (long long)vap->va_size, 792 (long long)np->n_size); 793 goto again; 794 } 795 if (error && vap->va_size != VNOVAL) { 796 np->n_size = np->n_vattr.va_size = tsize; 797 vnode_pager_setsize(vp, np->n_size); 798 } 799 return (error); 800 } 801 802 /* 803 * Do an nfs setattr rpc. 804 */ 805 static int 806 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 807 struct ucred *cred, struct thread *td) 808 { 809 struct nfsv2_sattr *sp; 810 struct nfsnode *np = VTONFS(vp); 811 caddr_t cp; 812 int32_t t1, t2; 813 caddr_t bpos, dpos, cp2; 814 u_int32_t *tl; 815 int error = 0, wccflag = NFSV3_WCCRATTR; 816 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 817 int v3 = NFS_ISV3(vp); 818 819 nfsstats.rpccnt[NFSPROC_SETATTR]++; 820 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 821 nfsm_fhtom(vp, v3); 822 if (v3) { 823 nfsm_v3attrbuild(vap, TRUE); 824 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 825 *tl = nfs_false; 826 } else { 827 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 828 if (vap->va_mode == (mode_t)VNOVAL) 829 sp->sa_mode = nfs_xdrneg1; 830 else 831 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 832 if (vap->va_uid == (uid_t)VNOVAL) 833 sp->sa_uid = nfs_xdrneg1; 834 else 835 sp->sa_uid = txdr_unsigned(vap->va_uid); 836 if (vap->va_gid == (gid_t)VNOVAL) 837 sp->sa_gid = nfs_xdrneg1; 838 else 839 sp->sa_gid = txdr_unsigned(vap->va_gid); 840 sp->sa_size = txdr_unsigned(vap->va_size); 841 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 842 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 843 } 844 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 845 if (v3) { 846 np->n_modestamp = 0; 847 nfsm_wcc_data(vp, wccflag); 848 } else 849 nfsm_loadattr(vp, NULL); 850 m_freem(mrep); 851 nfsmout: 852 return (error); 853 } 854 855 static 856 void 857 nfs_cache_setvp(struct nchandle *nch, struct vnode *vp, int nctimeout) 858 { 859 if (nctimeout == 0) 860 nctimeout = 1; 861 else 862 nctimeout *= hz; 863 cache_setvp(nch, vp); 864 cache_settimeout(nch, nctimeout); 865 } 866 867 /* 868 * NEW API CALL - replaces nfs_lookup(). However, we cannot remove 869 * nfs_lookup() until all remaining new api calls are implemented. 870 * 871 * Resolve a namecache entry. This function is passed a locked ncp and 872 * must call nfs_cache_setvp() on it as appropriate to resolve the entry. 873 */ 874 static int 875 nfs_nresolve(struct vop_nresolve_args *ap) 876 { 877 struct thread *td = curthread; 878 struct namecache *ncp; 879 struct ucred *cred; 880 struct nfsnode *np; 881 struct vnode *dvp; 882 struct vnode *nvp; 883 nfsfh_t *fhp; 884 int attrflag; 885 int fhsize; 886 int error; 887 int len; 888 int v3; 889 /******NFSM MACROS********/ 890 struct mbuf *mb, *mrep, *mreq, *mb2, *md; 891 caddr_t bpos, dpos, cp, cp2; 892 u_int32_t *tl; 893 int32_t t1, t2; 894 895 cred = ap->a_cred; 896 dvp = ap->a_dvp; 897 898 if ((error = vget(dvp, LK_SHARED)) != 0) 899 return (error); 900 901 nvp = NULL; 902 v3 = NFS_ISV3(dvp); 903 nfsstats.lookupcache_misses++; 904 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 905 ncp = ap->a_nch->ncp; 906 len = ncp->nc_nlen; 907 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 908 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 909 nfsm_fhtom(dvp, v3); 910 nfsm_strtom(ncp->nc_name, len, NFS_MAXNAMLEN); 911 nfsm_request(dvp, NFSPROC_LOOKUP, td, ap->a_cred); 912 if (error) { 913 /* 914 * Cache negatve lookups to reduce NFS traffic, but use 915 * a fast timeout. Otherwise use a timeout of 1 tick. 916 * XXX we should add a namecache flag for no-caching 917 * to uncache the negative hit as soon as possible, but 918 * we cannot simply destroy the entry because it is used 919 * as a placeholder by the caller. 920 */ 921 if (error == ENOENT) 922 nfs_cache_setvp(ap->a_nch, NULL, nfsneg_cache_timeout); 923 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 924 m_freem(mrep); 925 goto nfsmout; 926 } 927 928 /* 929 * Success, get the file handle, do various checks, and load 930 * post-operation data from the reply packet. Theoretically 931 * we should never be looking up "." so, theoretically, we 932 * should never get the same file handle as our directory. But 933 * we check anyway. XXX 934 * 935 * Note that no timeout is set for the positive cache hit. We 936 * assume, theoretically, that ESTALE returns will be dealt with 937 * properly to handle NFS races and in anycase we cannot depend 938 * on a timeout to deal with NFS open/create/excl issues so instead 939 * of a bad hack here the rest of the NFS client code needs to do 940 * the right thing. 941 */ 942 nfsm_getfh(fhp, fhsize, v3); 943 944 np = VTONFS(dvp); 945 if (NFS_CMPFH(np, fhp, fhsize)) { 946 vref(dvp); 947 nvp = dvp; 948 } else { 949 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 950 if (error) { 951 m_freem(mrep); 952 vput(dvp); 953 return (error); 954 } 955 nvp = NFSTOV(np); 956 } 957 if (v3) { 958 nfsm_postop_attr(nvp, attrflag, NFS_LATTR_NOSHRINK); 959 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 960 } else { 961 nfsm_loadattr(nvp, NULL); 962 } 963 nfs_cache_setvp(ap->a_nch, nvp, nfspos_cache_timeout); 964 m_freem(mrep); 965 nfsmout: 966 vput(dvp); 967 if (nvp) { 968 if (nvp == dvp) 969 vrele(nvp); 970 else 971 vput(nvp); 972 } 973 return (error); 974 } 975 976 /* 977 * 'cached' nfs directory lookup 978 * 979 * NOTE: cannot be removed until NFS implements all the new n*() API calls. 980 * 981 * nfs_lookup(struct vnode *a_dvp, struct vnode **a_vpp, 982 * struct componentname *a_cnp) 983 */ 984 static int 985 nfs_lookup(struct vop_old_lookup_args *ap) 986 { 987 struct componentname *cnp = ap->a_cnp; 988 struct vnode *dvp = ap->a_dvp; 989 struct vnode **vpp = ap->a_vpp; 990 int flags = cnp->cn_flags; 991 struct vnode *newvp; 992 u_int32_t *tl; 993 caddr_t cp; 994 int32_t t1, t2; 995 struct nfsmount *nmp; 996 caddr_t bpos, dpos, cp2; 997 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 998 long len; 999 nfsfh_t *fhp; 1000 struct nfsnode *np; 1001 int lockparent, wantparent, error = 0, attrflag, fhsize; 1002 int v3 = NFS_ISV3(dvp); 1003 1004 /* 1005 * Read-only mount check and directory check. 1006 */ 1007 *vpp = NULLVP; 1008 if ((dvp->v_mount->mnt_flag & MNT_RDONLY) && 1009 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 1010 return (EROFS); 1011 1012 if (dvp->v_type != VDIR) 1013 return (ENOTDIR); 1014 1015 /* 1016 * Look it up in the cache. Note that ENOENT is only returned if we 1017 * previously entered a negative hit (see later on). The additional 1018 * nfsneg_cache_timeout check causes previously cached results to 1019 * be instantly ignored if the negative caching is turned off. 1020 */ 1021 lockparent = flags & CNP_LOCKPARENT; 1022 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 1023 nmp = VFSTONFS(dvp->v_mount); 1024 np = VTONFS(dvp); 1025 1026 /* 1027 * Go to the wire. 1028 */ 1029 error = 0; 1030 newvp = NULLVP; 1031 nfsstats.lookupcache_misses++; 1032 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 1033 len = cnp->cn_namelen; 1034 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 1035 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 1036 nfsm_fhtom(dvp, v3); 1037 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1038 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 1039 if (error) { 1040 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1041 m_freem(mrep); 1042 goto nfsmout; 1043 } 1044 nfsm_getfh(fhp, fhsize, v3); 1045 1046 /* 1047 * Handle RENAME case... 1048 */ 1049 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent) { 1050 if (NFS_CMPFH(np, fhp, fhsize)) { 1051 m_freem(mrep); 1052 return (EISDIR); 1053 } 1054 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1055 if (error) { 1056 m_freem(mrep); 1057 return (error); 1058 } 1059 newvp = NFSTOV(np); 1060 if (v3) { 1061 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1062 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1063 } else 1064 nfsm_loadattr(newvp, NULL); 1065 *vpp = newvp; 1066 m_freem(mrep); 1067 if (!lockparent) { 1068 vn_unlock(dvp); 1069 cnp->cn_flags |= CNP_PDIRUNLOCK; 1070 } 1071 return (0); 1072 } 1073 1074 if (flags & CNP_ISDOTDOT) { 1075 vn_unlock(dvp); 1076 cnp->cn_flags |= CNP_PDIRUNLOCK; 1077 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1078 if (error) { 1079 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); 1080 cnp->cn_flags &= ~CNP_PDIRUNLOCK; 1081 return (error); /* NOTE: return error from nget */ 1082 } 1083 newvp = NFSTOV(np); 1084 if (lockparent) { 1085 error = vn_lock(dvp, LK_EXCLUSIVE); 1086 if (error) { 1087 vput(newvp); 1088 return (error); 1089 } 1090 cnp->cn_flags |= CNP_PDIRUNLOCK; 1091 } 1092 } else if (NFS_CMPFH(np, fhp, fhsize)) { 1093 vref(dvp); 1094 newvp = dvp; 1095 } else { 1096 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 1097 if (error) { 1098 m_freem(mrep); 1099 return (error); 1100 } 1101 if (!lockparent) { 1102 vn_unlock(dvp); 1103 cnp->cn_flags |= CNP_PDIRUNLOCK; 1104 } 1105 newvp = NFSTOV(np); 1106 } 1107 if (v3) { 1108 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 1109 nfsm_postop_attr(dvp, attrflag, NFS_LATTR_NOSHRINK); 1110 } else 1111 nfsm_loadattr(newvp, NULL); 1112 #if 0 1113 /* XXX MOVE TO nfs_nremove() */ 1114 if ((cnp->cn_flags & CNP_MAKEENTRY) && 1115 cnp->cn_nameiop != NAMEI_DELETE) { 1116 np->n_ctime = np->n_vattr.va_ctime.tv_sec; /* XXX */ 1117 } 1118 #endif 1119 *vpp = newvp; 1120 m_freem(mrep); 1121 nfsmout: 1122 if (error) { 1123 if (newvp != NULLVP) { 1124 vrele(newvp); 1125 *vpp = NULLVP; 1126 } 1127 if ((cnp->cn_nameiop == NAMEI_CREATE || 1128 cnp->cn_nameiop == NAMEI_RENAME) && 1129 error == ENOENT) { 1130 if (!lockparent) { 1131 vn_unlock(dvp); 1132 cnp->cn_flags |= CNP_PDIRUNLOCK; 1133 } 1134 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1135 error = EROFS; 1136 else 1137 error = EJUSTRETURN; 1138 } 1139 } 1140 return (error); 1141 } 1142 1143 /* 1144 * nfs read call. 1145 * Just call nfs_bioread() to do the work. 1146 * 1147 * nfs_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1148 * struct ucred *a_cred) 1149 */ 1150 static int 1151 nfs_read(struct vop_read_args *ap) 1152 { 1153 struct vnode *vp = ap->a_vp; 1154 1155 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1156 } 1157 1158 /* 1159 * nfs readlink call 1160 * 1161 * nfs_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 1162 */ 1163 static int 1164 nfs_readlink(struct vop_readlink_args *ap) 1165 { 1166 struct vnode *vp = ap->a_vp; 1167 1168 if (vp->v_type != VLNK) 1169 return (EINVAL); 1170 return (nfs_bioread(vp, ap->a_uio, 0)); 1171 } 1172 1173 /* 1174 * Do a readlink rpc. 1175 * Called by nfs_doio() from below the buffer cache. 1176 */ 1177 int 1178 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1179 { 1180 u_int32_t *tl; 1181 caddr_t cp; 1182 int32_t t1, t2; 1183 caddr_t bpos, dpos, cp2; 1184 int error = 0, len, attrflag; 1185 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1186 int v3 = NFS_ISV3(vp); 1187 1188 nfsstats.rpccnt[NFSPROC_READLINK]++; 1189 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1190 nfsm_fhtom(vp, v3); 1191 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, nfs_vpcred(vp, ND_CHECK)); 1192 if (v3) 1193 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1194 if (!error) { 1195 nfsm_strsiz(len, NFS_MAXPATHLEN); 1196 if (len == NFS_MAXPATHLEN) { 1197 struct nfsnode *np = VTONFS(vp); 1198 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1199 len = np->n_size; 1200 } 1201 nfsm_mtouio(uiop, len); 1202 } 1203 m_freem(mrep); 1204 nfsmout: 1205 return (error); 1206 } 1207 1208 /* 1209 * nfs read rpc call 1210 * Ditto above 1211 */ 1212 int 1213 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1214 { 1215 u_int32_t *tl; 1216 caddr_t cp; 1217 int32_t t1, t2; 1218 caddr_t bpos, dpos, cp2; 1219 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1220 struct nfsmount *nmp; 1221 int error = 0, len, retlen, tsiz, eof, attrflag; 1222 int v3 = NFS_ISV3(vp); 1223 1224 #ifndef nolint 1225 eof = 0; 1226 #endif 1227 nmp = VFSTONFS(vp->v_mount); 1228 tsiz = uiop->uio_resid; 1229 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1230 return (EFBIG); 1231 while (tsiz > 0) { 1232 nfsstats.rpccnt[NFSPROC_READ]++; 1233 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1234 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1235 nfsm_fhtom(vp, v3); 1236 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1237 if (v3) { 1238 txdr_hyper(uiop->uio_offset, tl); 1239 *(tl + 2) = txdr_unsigned(len); 1240 } else { 1241 *tl++ = txdr_unsigned(uiop->uio_offset); 1242 *tl++ = txdr_unsigned(len); 1243 *tl = 0; 1244 } 1245 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 1246 if (v3) { 1247 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1248 if (error) { 1249 m_freem(mrep); 1250 goto nfsmout; 1251 } 1252 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1253 eof = fxdr_unsigned(int, *(tl + 1)); 1254 } else 1255 nfsm_loadattr(vp, NULL); 1256 nfsm_strsiz(retlen, nmp->nm_rsize); 1257 nfsm_mtouio(uiop, retlen); 1258 m_freem(mrep); 1259 tsiz -= retlen; 1260 if (v3) { 1261 if (eof || retlen == 0) { 1262 tsiz = 0; 1263 } 1264 } else if (retlen < len) { 1265 tsiz = 0; 1266 } 1267 } 1268 nfsmout: 1269 return (error); 1270 } 1271 1272 /* 1273 * nfs write call 1274 */ 1275 int 1276 nfs_writerpc(struct vnode *vp, struct uio *uiop, int *iomode, int *must_commit) 1277 { 1278 u_int32_t *tl; 1279 caddr_t cp; 1280 int32_t t1, t2, backup; 1281 caddr_t bpos, dpos, cp2; 1282 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1283 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1284 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1285 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1286 1287 #ifndef DIAGNOSTIC 1288 if (uiop->uio_iovcnt != 1) 1289 panic("nfs: writerpc iovcnt > 1"); 1290 #endif 1291 *must_commit = 0; 1292 tsiz = uiop->uio_resid; 1293 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1294 return (EFBIG); 1295 while (tsiz > 0) { 1296 nfsstats.rpccnt[NFSPROC_WRITE]++; 1297 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1298 nfsm_reqhead(vp, NFSPROC_WRITE, 1299 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1300 nfsm_fhtom(vp, v3); 1301 if (v3) { 1302 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1303 txdr_hyper(uiop->uio_offset, tl); 1304 tl += 2; 1305 *tl++ = txdr_unsigned(len); 1306 *tl++ = txdr_unsigned(*iomode); 1307 *tl = txdr_unsigned(len); 1308 } else { 1309 u_int32_t x; 1310 1311 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1312 /* Set both "begin" and "current" to non-garbage. */ 1313 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1314 *tl++ = x; /* "begin offset" */ 1315 *tl++ = x; /* "current offset" */ 1316 x = txdr_unsigned(len); 1317 *tl++ = x; /* total to this offset */ 1318 *tl = x; /* size of this write */ 1319 } 1320 nfsm_uiotom(uiop, len); 1321 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, nfs_vpcred(vp, ND_WRITE)); 1322 if (v3) { 1323 /* 1324 * The write RPC returns a before and after mtime. The 1325 * nfsm_wcc_data() macro checks the before n_mtime 1326 * against the before time and stores the after time 1327 * in the nfsnode's cached vattr and n_mtime field. 1328 * The NRMODIFIED bit will be set if the before 1329 * time did not match the original mtime. 1330 */ 1331 wccflag = NFSV3_WCCCHK; 1332 nfsm_wcc_data(vp, wccflag); 1333 if (!error) { 1334 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1335 + NFSX_V3WRITEVERF); 1336 rlen = fxdr_unsigned(int, *tl++); 1337 if (rlen == 0) { 1338 error = NFSERR_IO; 1339 m_freem(mrep); 1340 break; 1341 } else if (rlen < len) { 1342 backup = len - rlen; 1343 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base - backup; 1344 uiop->uio_iov->iov_len += backup; 1345 uiop->uio_offset -= backup; 1346 uiop->uio_resid += backup; 1347 len = rlen; 1348 } 1349 commit = fxdr_unsigned(int, *tl++); 1350 1351 /* 1352 * Return the lowest committment level 1353 * obtained by any of the RPCs. 1354 */ 1355 if (committed == NFSV3WRITE_FILESYNC) 1356 committed = commit; 1357 else if (committed == NFSV3WRITE_DATASYNC && 1358 commit == NFSV3WRITE_UNSTABLE) 1359 committed = commit; 1360 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1361 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1362 NFSX_V3WRITEVERF); 1363 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1364 } else if (bcmp((caddr_t)tl, 1365 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1366 *must_commit = 1; 1367 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1368 NFSX_V3WRITEVERF); 1369 } 1370 } 1371 } else { 1372 nfsm_loadattr(vp, NULL); 1373 } 1374 m_freem(mrep); 1375 if (error) 1376 break; 1377 tsiz -= len; 1378 } 1379 nfsmout: 1380 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1381 committed = NFSV3WRITE_FILESYNC; 1382 *iomode = committed; 1383 if (error) 1384 uiop->uio_resid = tsiz; 1385 return (error); 1386 } 1387 1388 /* 1389 * nfs mknod rpc 1390 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1391 * mode set to specify the file type and the size field for rdev. 1392 */ 1393 static int 1394 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, 1395 struct vattr *vap) 1396 { 1397 struct nfsv2_sattr *sp; 1398 u_int32_t *tl; 1399 caddr_t cp; 1400 int32_t t1, t2; 1401 struct vnode *newvp = NULL; 1402 struct nfsnode *np = NULL; 1403 struct vattr vattr; 1404 char *cp2; 1405 caddr_t bpos, dpos; 1406 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1407 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1408 int rmajor, rminor; 1409 int v3 = NFS_ISV3(dvp); 1410 1411 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1412 rmajor = txdr_unsigned(vap->va_rmajor); 1413 rminor = txdr_unsigned(vap->va_rminor); 1414 } else if (vap->va_type == VFIFO || vap->va_type == VSOCK) { 1415 rmajor = nfs_xdrneg1; 1416 rminor = nfs_xdrneg1; 1417 } else { 1418 return (EOPNOTSUPP); 1419 } 1420 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1421 return (error); 1422 } 1423 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1424 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1425 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1426 nfsm_fhtom(dvp, v3); 1427 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1428 if (v3) { 1429 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1430 *tl++ = vtonfsv3_type(vap->va_type); 1431 nfsm_v3attrbuild(vap, FALSE); 1432 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1433 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1434 *tl++ = txdr_unsigned(vap->va_rmajor); 1435 *tl = txdr_unsigned(vap->va_rminor); 1436 } 1437 } else { 1438 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1439 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1440 sp->sa_uid = nfs_xdrneg1; 1441 sp->sa_gid = nfs_xdrneg1; 1442 sp->sa_size = makeudev(rmajor, rminor); 1443 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1444 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1445 } 1446 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1447 if (!error) { 1448 nfsm_mtofh(dvp, newvp, v3, gotvp); 1449 if (!gotvp) { 1450 if (newvp) { 1451 vput(newvp); 1452 newvp = NULL; 1453 } 1454 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1455 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1456 if (!error) 1457 newvp = NFSTOV(np); 1458 } 1459 } 1460 if (v3) 1461 nfsm_wcc_data(dvp, wccflag); 1462 m_freem(mrep); 1463 nfsmout: 1464 if (error) { 1465 if (newvp) 1466 vput(newvp); 1467 } else { 1468 *vpp = newvp; 1469 } 1470 VTONFS(dvp)->n_flag |= NLMODIFIED; 1471 if (!wccflag) 1472 VTONFS(dvp)->n_attrstamp = 0; 1473 return (error); 1474 } 1475 1476 /* 1477 * nfs mknod vop 1478 * just call nfs_mknodrpc() to do the work. 1479 * 1480 * nfs_mknod(struct vnode *a_dvp, struct vnode **a_vpp, 1481 * struct componentname *a_cnp, struct vattr *a_vap) 1482 */ 1483 /* ARGSUSED */ 1484 static int 1485 nfs_mknod(struct vop_old_mknod_args *ap) 1486 { 1487 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1488 } 1489 1490 static u_long create_verf; 1491 /* 1492 * nfs file create call 1493 * 1494 * nfs_create(struct vnode *a_dvp, struct vnode **a_vpp, 1495 * struct componentname *a_cnp, struct vattr *a_vap) 1496 */ 1497 static int 1498 nfs_create(struct vop_old_create_args *ap) 1499 { 1500 struct vnode *dvp = ap->a_dvp; 1501 struct vattr *vap = ap->a_vap; 1502 struct componentname *cnp = ap->a_cnp; 1503 struct nfsv2_sattr *sp; 1504 u_int32_t *tl; 1505 caddr_t cp; 1506 int32_t t1, t2; 1507 struct nfsnode *np = NULL; 1508 struct vnode *newvp = NULL; 1509 caddr_t bpos, dpos, cp2; 1510 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1511 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1512 struct vattr vattr; 1513 int v3 = NFS_ISV3(dvp); 1514 1515 /* 1516 * Oops, not for me.. 1517 */ 1518 if (vap->va_type == VSOCK) 1519 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1520 1521 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 1522 return (error); 1523 } 1524 if (vap->va_vaflags & VA_EXCLUSIVE) 1525 fmode |= O_EXCL; 1526 again: 1527 nfsstats.rpccnt[NFSPROC_CREATE]++; 1528 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1529 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1530 nfsm_fhtom(dvp, v3); 1531 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1532 if (v3) { 1533 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1534 if (fmode & O_EXCL) { 1535 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1536 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1537 #ifdef INET 1538 if (!TAILQ_EMPTY(&in_ifaddrheads[mycpuid])) 1539 *tl++ = IA_SIN(TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia)->sin_addr.s_addr; 1540 else 1541 #endif 1542 *tl++ = create_verf; 1543 *tl = ++create_verf; 1544 } else { 1545 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1546 nfsm_v3attrbuild(vap, FALSE); 1547 } 1548 } else { 1549 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1550 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1551 sp->sa_uid = nfs_xdrneg1; 1552 sp->sa_gid = nfs_xdrneg1; 1553 sp->sa_size = 0; 1554 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1555 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1556 } 1557 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1558 if (!error) { 1559 nfsm_mtofh(dvp, newvp, v3, gotvp); 1560 if (!gotvp) { 1561 if (newvp) { 1562 vput(newvp); 1563 newvp = NULL; 1564 } 1565 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1566 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1567 if (!error) 1568 newvp = NFSTOV(np); 1569 } 1570 } 1571 if (v3) 1572 nfsm_wcc_data(dvp, wccflag); 1573 m_freem(mrep); 1574 nfsmout: 1575 if (error) { 1576 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1577 KKASSERT(newvp == NULL); 1578 fmode &= ~O_EXCL; 1579 goto again; 1580 } 1581 } else if (v3 && (fmode & O_EXCL)) { 1582 /* 1583 * We are normally called with only a partially initialized 1584 * VAP. Since the NFSv3 spec says that server may use the 1585 * file attributes to store the verifier, the spec requires 1586 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1587 * in atime, but we can't really assume that all servers will 1588 * so we ensure that our SETATTR sets both atime and mtime. 1589 */ 1590 if (vap->va_mtime.tv_sec == VNOVAL) 1591 vfs_timestamp(&vap->va_mtime); 1592 if (vap->va_atime.tv_sec == VNOVAL) 1593 vap->va_atime = vap->va_mtime; 1594 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1595 } 1596 if (error == 0) { 1597 /* 1598 * The new np may have enough info for access 1599 * checks, make sure rucred and wucred are 1600 * initialized for read and write rpc's. 1601 */ 1602 np = VTONFS(newvp); 1603 if (np->n_rucred == NULL) 1604 np->n_rucred = crhold(cnp->cn_cred); 1605 if (np->n_wucred == NULL) 1606 np->n_wucred = crhold(cnp->cn_cred); 1607 *ap->a_vpp = newvp; 1608 } else if (newvp) { 1609 vput(newvp); 1610 } 1611 VTONFS(dvp)->n_flag |= NLMODIFIED; 1612 if (!wccflag) 1613 VTONFS(dvp)->n_attrstamp = 0; 1614 return (error); 1615 } 1616 1617 /* 1618 * nfs file remove call 1619 * To try and make nfs semantics closer to ufs semantics, a file that has 1620 * other processes using the vnode is renamed instead of removed and then 1621 * removed later on the last close. 1622 * - If v_sysref.refcnt > 1 1623 * If a rename is not already in the works 1624 * call nfs_sillyrename() to set it up 1625 * else 1626 * do the remove rpc 1627 * 1628 * nfs_remove(struct vnode *a_dvp, struct vnode *a_vp, 1629 * struct componentname *a_cnp) 1630 */ 1631 static int 1632 nfs_remove(struct vop_old_remove_args *ap) 1633 { 1634 struct vnode *vp = ap->a_vp; 1635 struct vnode *dvp = ap->a_dvp; 1636 struct componentname *cnp = ap->a_cnp; 1637 struct nfsnode *np = VTONFS(vp); 1638 int error = 0; 1639 struct vattr vattr; 1640 1641 #ifndef DIAGNOSTIC 1642 if (vp->v_sysref.refcnt < 1) 1643 panic("nfs_remove: bad v_sysref.refcnt"); 1644 #endif 1645 if (vp->v_type == VDIR) 1646 error = EPERM; 1647 else if (vp->v_sysref.refcnt == 1 || (np->n_sillyrename && 1648 VOP_GETATTR(vp, &vattr) == 0 && 1649 vattr.va_nlink > 1)) { 1650 /* 1651 * throw away biocache buffers, mainly to avoid 1652 * unnecessary delayed writes later. 1653 */ 1654 error = nfs_vinvalbuf(vp, 0, 1); 1655 /* Do the rpc */ 1656 if (error != EINTR) 1657 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1658 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1659 /* 1660 * Kludge City: If the first reply to the remove rpc is lost.. 1661 * the reply to the retransmitted request will be ENOENT 1662 * since the file was in fact removed 1663 * Therefore, we cheat and return success. 1664 */ 1665 if (error == ENOENT) 1666 error = 0; 1667 } else if (!np->n_sillyrename) { 1668 error = nfs_sillyrename(dvp, vp, cnp); 1669 } 1670 np->n_attrstamp = 0; 1671 return (error); 1672 } 1673 1674 /* 1675 * nfs file remove rpc called from nfs_inactive 1676 */ 1677 int 1678 nfs_removeit(struct sillyrename *sp) 1679 { 1680 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1681 sp->s_cred, NULL)); 1682 } 1683 1684 /* 1685 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1686 */ 1687 static int 1688 nfs_removerpc(struct vnode *dvp, const char *name, int namelen, 1689 struct ucred *cred, struct thread *td) 1690 { 1691 u_int32_t *tl; 1692 caddr_t cp; 1693 int32_t t1, t2; 1694 caddr_t bpos, dpos, cp2; 1695 int error = 0, wccflag = NFSV3_WCCRATTR; 1696 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1697 int v3 = NFS_ISV3(dvp); 1698 1699 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1700 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1701 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1702 nfsm_fhtom(dvp, v3); 1703 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1704 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1705 if (v3) 1706 nfsm_wcc_data(dvp, wccflag); 1707 m_freem(mrep); 1708 nfsmout: 1709 VTONFS(dvp)->n_flag |= NLMODIFIED; 1710 if (!wccflag) 1711 VTONFS(dvp)->n_attrstamp = 0; 1712 return (error); 1713 } 1714 1715 /* 1716 * nfs file rename call 1717 * 1718 * nfs_rename(struct vnode *a_fdvp, struct vnode *a_fvp, 1719 * struct componentname *a_fcnp, struct vnode *a_tdvp, 1720 * struct vnode *a_tvp, struct componentname *a_tcnp) 1721 */ 1722 static int 1723 nfs_rename(struct vop_old_rename_args *ap) 1724 { 1725 struct vnode *fvp = ap->a_fvp; 1726 struct vnode *tvp = ap->a_tvp; 1727 struct vnode *fdvp = ap->a_fdvp; 1728 struct vnode *tdvp = ap->a_tdvp; 1729 struct componentname *tcnp = ap->a_tcnp; 1730 struct componentname *fcnp = ap->a_fcnp; 1731 int error; 1732 1733 /* Check for cross-device rename */ 1734 if ((fvp->v_mount != tdvp->v_mount) || 1735 (tvp && (fvp->v_mount != tvp->v_mount))) { 1736 error = EXDEV; 1737 goto out; 1738 } 1739 1740 /* 1741 * We shouldn't have to flush fvp on rename for most server-side 1742 * filesystems as the file handle should not change. Unfortunately 1743 * the inode for some filesystems (msdosfs) might be tied to the 1744 * file name or directory position so to be completely safe 1745 * vfs.nfs.flush_on_rename is set by default. Clear to improve 1746 * performance. 1747 * 1748 * We must flush tvp on rename because it might become stale on the 1749 * server after the rename. 1750 */ 1751 if (nfs_flush_on_rename) 1752 VOP_FSYNC(fvp, MNT_WAIT); 1753 if (tvp) 1754 VOP_FSYNC(tvp, MNT_WAIT); 1755 1756 /* 1757 * If the tvp exists and is in use, sillyrename it before doing the 1758 * rename of the new file over it. 1759 * 1760 * XXX Can't sillyrename a directory. 1761 * 1762 * We do not attempt to do any namecache purges in this old API 1763 * routine. The new API compat functions have access to the actual 1764 * namecache structures and will do it for us. 1765 */ 1766 if (tvp && tvp->v_sysref.refcnt > 1 && !VTONFS(tvp)->n_sillyrename && 1767 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1768 vput(tvp); 1769 tvp = NULL; 1770 } else if (tvp) { 1771 ; 1772 } 1773 1774 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1775 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1776 tcnp->cn_td); 1777 1778 out: 1779 if (tdvp == tvp) 1780 vrele(tdvp); 1781 else 1782 vput(tdvp); 1783 if (tvp) 1784 vput(tvp); 1785 vrele(fdvp); 1786 vrele(fvp); 1787 /* 1788 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1789 */ 1790 if (error == ENOENT) 1791 error = 0; 1792 return (error); 1793 } 1794 1795 /* 1796 * nfs file rename rpc called from nfs_remove() above 1797 */ 1798 static int 1799 nfs_renameit(struct vnode *sdvp, struct componentname *scnp, 1800 struct sillyrename *sp) 1801 { 1802 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1803 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1804 } 1805 1806 /* 1807 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1808 */ 1809 static int 1810 nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, 1811 struct vnode *tdvp, const char *tnameptr, int tnamelen, 1812 struct ucred *cred, struct thread *td) 1813 { 1814 u_int32_t *tl; 1815 caddr_t cp; 1816 int32_t t1, t2; 1817 caddr_t bpos, dpos, cp2; 1818 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1819 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1820 int v3 = NFS_ISV3(fdvp); 1821 1822 nfsstats.rpccnt[NFSPROC_RENAME]++; 1823 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1824 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1825 nfsm_rndup(tnamelen)); 1826 nfsm_fhtom(fdvp, v3); 1827 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1828 nfsm_fhtom(tdvp, v3); 1829 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1830 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1831 if (v3) { 1832 nfsm_wcc_data(fdvp, fwccflag); 1833 nfsm_wcc_data(tdvp, twccflag); 1834 } 1835 m_freem(mrep); 1836 nfsmout: 1837 VTONFS(fdvp)->n_flag |= NLMODIFIED; 1838 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1839 if (!fwccflag) 1840 VTONFS(fdvp)->n_attrstamp = 0; 1841 if (!twccflag) 1842 VTONFS(tdvp)->n_attrstamp = 0; 1843 return (error); 1844 } 1845 1846 /* 1847 * nfs hard link create call 1848 * 1849 * nfs_link(struct vnode *a_tdvp, struct vnode *a_vp, 1850 * struct componentname *a_cnp) 1851 */ 1852 static int 1853 nfs_link(struct vop_old_link_args *ap) 1854 { 1855 struct vnode *vp = ap->a_vp; 1856 struct vnode *tdvp = ap->a_tdvp; 1857 struct componentname *cnp = ap->a_cnp; 1858 u_int32_t *tl; 1859 caddr_t cp; 1860 int32_t t1, t2; 1861 caddr_t bpos, dpos, cp2; 1862 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1863 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1864 int v3; 1865 1866 if (vp->v_mount != tdvp->v_mount) { 1867 return (EXDEV); 1868 } 1869 1870 /* 1871 * The attribute cache may get out of sync with the server on link. 1872 * Pushing writes to the server before handle was inherited from 1873 * long long ago and it is unclear if we still need to do this. 1874 * Defaults to off. 1875 */ 1876 if (nfs_flush_on_hlink) 1877 VOP_FSYNC(vp, MNT_WAIT); 1878 1879 v3 = NFS_ISV3(vp); 1880 nfsstats.rpccnt[NFSPROC_LINK]++; 1881 nfsm_reqhead(vp, NFSPROC_LINK, 1882 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1883 nfsm_fhtom(vp, v3); 1884 nfsm_fhtom(tdvp, v3); 1885 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1886 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1887 if (v3) { 1888 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 1889 nfsm_wcc_data(tdvp, wccflag); 1890 } 1891 m_freem(mrep); 1892 nfsmout: 1893 VTONFS(tdvp)->n_flag |= NLMODIFIED; 1894 if (!attrflag) 1895 VTONFS(vp)->n_attrstamp = 0; 1896 if (!wccflag) 1897 VTONFS(tdvp)->n_attrstamp = 0; 1898 /* 1899 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1900 */ 1901 if (error == EEXIST) 1902 error = 0; 1903 return (error); 1904 } 1905 1906 /* 1907 * nfs symbolic link create call 1908 * 1909 * nfs_symlink(struct vnode *a_dvp, struct vnode **a_vpp, 1910 * struct componentname *a_cnp, struct vattr *a_vap, 1911 * char *a_target) 1912 */ 1913 static int 1914 nfs_symlink(struct vop_old_symlink_args *ap) 1915 { 1916 struct vnode *dvp = ap->a_dvp; 1917 struct vattr *vap = ap->a_vap; 1918 struct componentname *cnp = ap->a_cnp; 1919 struct nfsv2_sattr *sp; 1920 u_int32_t *tl; 1921 caddr_t cp; 1922 int32_t t1, t2; 1923 caddr_t bpos, dpos, cp2; 1924 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1925 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1926 struct vnode *newvp = NULL; 1927 int v3 = NFS_ISV3(dvp); 1928 1929 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1930 slen = strlen(ap->a_target); 1931 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1932 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1933 nfsm_fhtom(dvp, v3); 1934 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1935 if (v3) { 1936 nfsm_v3attrbuild(vap, FALSE); 1937 } 1938 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1939 if (!v3) { 1940 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1941 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1942 sp->sa_uid = nfs_xdrneg1; 1943 sp->sa_gid = nfs_xdrneg1; 1944 sp->sa_size = nfs_xdrneg1; 1945 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1946 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1947 } 1948 1949 /* 1950 * Issue the NFS request and get the rpc response. 1951 * 1952 * Only NFSv3 responses returning an error of 0 actually return 1953 * a file handle that can be converted into newvp without having 1954 * to do an extra lookup rpc. 1955 */ 1956 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1957 if (v3) { 1958 if (error == 0) 1959 nfsm_mtofh(dvp, newvp, v3, gotvp); 1960 nfsm_wcc_data(dvp, wccflag); 1961 } 1962 1963 /* 1964 * out code jumps -> here, mrep is also freed. 1965 */ 1966 1967 m_freem(mrep); 1968 nfsmout: 1969 1970 /* 1971 * If we get an EEXIST error, silently convert it to no-error 1972 * in case of an NFS retry. 1973 */ 1974 if (error == EEXIST) 1975 error = 0; 1976 1977 /* 1978 * If we do not have (or no longer have) an error, and we could 1979 * not extract the newvp from the response due to the request being 1980 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1981 * to obtain a newvp to return. 1982 */ 1983 if (error == 0 && newvp == NULL) { 1984 struct nfsnode *np = NULL; 1985 1986 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1987 cnp->cn_cred, cnp->cn_td, &np); 1988 if (!error) 1989 newvp = NFSTOV(np); 1990 } 1991 if (error) { 1992 if (newvp) 1993 vput(newvp); 1994 } else { 1995 *ap->a_vpp = newvp; 1996 } 1997 VTONFS(dvp)->n_flag |= NLMODIFIED; 1998 if (!wccflag) 1999 VTONFS(dvp)->n_attrstamp = 0; 2000 return (error); 2001 } 2002 2003 /* 2004 * nfs make dir call 2005 * 2006 * nfs_mkdir(struct vnode *a_dvp, struct vnode **a_vpp, 2007 * struct componentname *a_cnp, struct vattr *a_vap) 2008 */ 2009 static int 2010 nfs_mkdir(struct vop_old_mkdir_args *ap) 2011 { 2012 struct vnode *dvp = ap->a_dvp; 2013 struct vattr *vap = ap->a_vap; 2014 struct componentname *cnp = ap->a_cnp; 2015 struct nfsv2_sattr *sp; 2016 u_int32_t *tl; 2017 caddr_t cp; 2018 int32_t t1, t2; 2019 int len; 2020 struct nfsnode *np = NULL; 2021 struct vnode *newvp = NULL; 2022 caddr_t bpos, dpos, cp2; 2023 int error = 0, wccflag = NFSV3_WCCRATTR; 2024 int gotvp = 0; 2025 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2026 struct vattr vattr; 2027 int v3 = NFS_ISV3(dvp); 2028 2029 if ((error = VOP_GETATTR(dvp, &vattr)) != 0) { 2030 return (error); 2031 } 2032 len = cnp->cn_namelen; 2033 nfsstats.rpccnt[NFSPROC_MKDIR]++; 2034 nfsm_reqhead(dvp, NFSPROC_MKDIR, 2035 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 2036 nfsm_fhtom(dvp, v3); 2037 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 2038 if (v3) { 2039 nfsm_v3attrbuild(vap, FALSE); 2040 } else { 2041 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 2042 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 2043 sp->sa_uid = nfs_xdrneg1; 2044 sp->sa_gid = nfs_xdrneg1; 2045 sp->sa_size = nfs_xdrneg1; 2046 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 2047 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 2048 } 2049 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 2050 if (!error) 2051 nfsm_mtofh(dvp, newvp, v3, gotvp); 2052 if (v3) 2053 nfsm_wcc_data(dvp, wccflag); 2054 m_freem(mrep); 2055 nfsmout: 2056 VTONFS(dvp)->n_flag |= NLMODIFIED; 2057 if (!wccflag) 2058 VTONFS(dvp)->n_attrstamp = 0; 2059 /* 2060 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 2061 * if we can succeed in looking up the directory. 2062 */ 2063 if (error == EEXIST || (!error && !gotvp)) { 2064 if (newvp) { 2065 vrele(newvp); 2066 newvp = NULL; 2067 } 2068 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 2069 cnp->cn_td, &np); 2070 if (!error) { 2071 newvp = NFSTOV(np); 2072 if (newvp->v_type != VDIR) 2073 error = EEXIST; 2074 } 2075 } 2076 if (error) { 2077 if (newvp) 2078 vrele(newvp); 2079 } else 2080 *ap->a_vpp = newvp; 2081 return (error); 2082 } 2083 2084 /* 2085 * nfs remove directory call 2086 * 2087 * nfs_rmdir(struct vnode *a_dvp, struct vnode *a_vp, 2088 * struct componentname *a_cnp) 2089 */ 2090 static int 2091 nfs_rmdir(struct vop_old_rmdir_args *ap) 2092 { 2093 struct vnode *vp = ap->a_vp; 2094 struct vnode *dvp = ap->a_dvp; 2095 struct componentname *cnp = ap->a_cnp; 2096 u_int32_t *tl; 2097 caddr_t cp; 2098 int32_t t1, t2; 2099 caddr_t bpos, dpos, cp2; 2100 int error = 0, wccflag = NFSV3_WCCRATTR; 2101 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2102 int v3 = NFS_ISV3(dvp); 2103 2104 if (dvp == vp) 2105 return (EINVAL); 2106 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2107 nfsm_reqhead(dvp, NFSPROC_RMDIR, 2108 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2109 nfsm_fhtom(dvp, v3); 2110 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2111 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2112 if (v3) 2113 nfsm_wcc_data(dvp, wccflag); 2114 m_freem(mrep); 2115 nfsmout: 2116 VTONFS(dvp)->n_flag |= NLMODIFIED; 2117 if (!wccflag) 2118 VTONFS(dvp)->n_attrstamp = 0; 2119 /* 2120 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2121 */ 2122 if (error == ENOENT) 2123 error = 0; 2124 return (error); 2125 } 2126 2127 /* 2128 * nfs readdir call 2129 * 2130 * nfs_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred) 2131 */ 2132 static int 2133 nfs_readdir(struct vop_readdir_args *ap) 2134 { 2135 struct vnode *vp = ap->a_vp; 2136 struct nfsnode *np = VTONFS(vp); 2137 struct uio *uio = ap->a_uio; 2138 int tresid, error; 2139 struct vattr vattr; 2140 2141 if (vp->v_type != VDIR) 2142 return (EPERM); 2143 2144 if ((error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 2145 return (error); 2146 2147 /* 2148 * If we have a valid EOF offset cache we must call VOP_GETATTR() 2149 * and then check that is still valid, or if this is an NQNFS mount 2150 * we call NQNFS_CKCACHEABLE() instead of VOP_GETATTR(). Note that 2151 * VOP_GETATTR() does not necessarily go to the wire. 2152 */ 2153 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2154 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0) { 2155 if (VOP_GETATTR(vp, &vattr) == 0 && 2156 (np->n_flag & (NLMODIFIED|NRMODIFIED)) == 0 2157 ) { 2158 nfsstats.direofcache_hits++; 2159 goto done; 2160 } 2161 } 2162 2163 /* 2164 * Call nfs_bioread() to do the real work. nfs_bioread() does its 2165 * own cache coherency checks so we do not have to. 2166 */ 2167 tresid = uio->uio_resid; 2168 error = nfs_bioread(vp, uio, 0); 2169 2170 if (!error && uio->uio_resid == tresid) 2171 nfsstats.direofcache_misses++; 2172 done: 2173 vn_unlock(vp); 2174 return (error); 2175 } 2176 2177 /* 2178 * Readdir rpc call. nfs_bioread->nfs_doio->nfs_readdirrpc. 2179 * 2180 * Note that for directories, nfs_bioread maintains the underlying nfs-centric 2181 * offset/block and converts the nfs formatted directory entries for userland 2182 * consumption as well as deals with offsets into the middle of blocks. 2183 * nfs_doio only deals with logical blocks. In particular, uio_offset will 2184 * be block-bounded. It must convert to cookies for the actual RPC. 2185 */ 2186 int 2187 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2188 { 2189 int len, left; 2190 struct nfs_dirent *dp = NULL; 2191 u_int32_t *tl; 2192 caddr_t cp; 2193 int32_t t1, t2; 2194 nfsuint64 *cookiep; 2195 caddr_t bpos, dpos, cp2; 2196 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2197 nfsuint64 cookie; 2198 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2199 struct nfsnode *dnp = VTONFS(vp); 2200 u_quad_t fileno; 2201 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2202 int attrflag; 2203 int v3 = NFS_ISV3(vp); 2204 2205 #ifndef DIAGNOSTIC 2206 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2207 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2208 panic("nfs readdirrpc bad uio"); 2209 #endif 2210 2211 /* 2212 * If there is no cookie, assume directory was stale. 2213 */ 2214 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2215 if (cookiep) 2216 cookie = *cookiep; 2217 else 2218 return (NFSERR_BAD_COOKIE); 2219 /* 2220 * Loop around doing readdir rpc's of size nm_readdirsize 2221 * truncated to a multiple of DIRBLKSIZ. 2222 * The stopping criteria is EOF or buffer full. 2223 */ 2224 while (more_dirs && bigenough) { 2225 nfsstats.rpccnt[NFSPROC_READDIR]++; 2226 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2227 NFSX_READDIR(v3)); 2228 nfsm_fhtom(vp, v3); 2229 if (v3) { 2230 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2231 *tl++ = cookie.nfsuquad[0]; 2232 *tl++ = cookie.nfsuquad[1]; 2233 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2234 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2235 } else { 2236 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2237 *tl++ = cookie.nfsuquad[0]; 2238 } 2239 *tl = txdr_unsigned(nmp->nm_readdirsize); 2240 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2241 if (v3) { 2242 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2243 if (!error) { 2244 nfsm_dissect(tl, u_int32_t *, 2245 2 * NFSX_UNSIGNED); 2246 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2247 dnp->n_cookieverf.nfsuquad[1] = *tl; 2248 } else { 2249 m_freem(mrep); 2250 goto nfsmout; 2251 } 2252 } 2253 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2254 more_dirs = fxdr_unsigned(int, *tl); 2255 2256 /* loop thru the dir entries, converting them to std form */ 2257 while (more_dirs && bigenough) { 2258 if (v3) { 2259 nfsm_dissect(tl, u_int32_t *, 2260 3 * NFSX_UNSIGNED); 2261 fileno = fxdr_hyper(tl); 2262 len = fxdr_unsigned(int, *(tl + 2)); 2263 } else { 2264 nfsm_dissect(tl, u_int32_t *, 2265 2 * NFSX_UNSIGNED); 2266 fileno = fxdr_unsigned(u_quad_t, *tl++); 2267 len = fxdr_unsigned(int, *tl); 2268 } 2269 if (len <= 0 || len > NFS_MAXNAMLEN) { 2270 error = EBADRPC; 2271 m_freem(mrep); 2272 goto nfsmout; 2273 } 2274 2275 /* 2276 * len is the number of bytes in the path element 2277 * name, not including the \0 termination. 2278 * 2279 * tlen is the number of bytes w have to reserve for 2280 * the path element name. 2281 */ 2282 tlen = nfsm_rndup(len); 2283 if (tlen == len) 2284 tlen += 4; /* To ensure null termination */ 2285 2286 /* 2287 * If the entry would cross a DIRBLKSIZ boundary, 2288 * extend the previous nfs_dirent to cover the 2289 * remaining space. 2290 */ 2291 left = DIRBLKSIZ - blksiz; 2292 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2293 dp->nfs_reclen += left; 2294 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2295 uiop->uio_iov->iov_len -= left; 2296 uiop->uio_offset += left; 2297 uiop->uio_resid -= left; 2298 blksiz = 0; 2299 } 2300 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2301 bigenough = 0; 2302 if (bigenough) { 2303 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2304 dp->nfs_ino = fileno; 2305 dp->nfs_namlen = len; 2306 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2307 dp->nfs_type = DT_UNKNOWN; 2308 blksiz += dp->nfs_reclen; 2309 if (blksiz == DIRBLKSIZ) 2310 blksiz = 0; 2311 uiop->uio_offset += sizeof(struct nfs_dirent); 2312 uiop->uio_resid -= sizeof(struct nfs_dirent); 2313 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2314 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2315 nfsm_mtouio(uiop, len); 2316 2317 /* 2318 * The uiop has advanced by nfs_dirent + len 2319 * but really needs to advance by 2320 * nfs_dirent + tlen 2321 */ 2322 cp = uiop->uio_iov->iov_base; 2323 tlen -= len; 2324 *cp = '\0'; /* null terminate */ 2325 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2326 uiop->uio_iov->iov_len -= tlen; 2327 uiop->uio_offset += tlen; 2328 uiop->uio_resid -= tlen; 2329 } else { 2330 /* 2331 * NFS strings must be rounded up (nfsm_myouio 2332 * handled that in the bigenough case). 2333 */ 2334 nfsm_adv(nfsm_rndup(len)); 2335 } 2336 if (v3) { 2337 nfsm_dissect(tl, u_int32_t *, 2338 3 * NFSX_UNSIGNED); 2339 } else { 2340 nfsm_dissect(tl, u_int32_t *, 2341 2 * NFSX_UNSIGNED); 2342 } 2343 2344 /* 2345 * If we were able to accomodate the last entry, 2346 * get the cookie for the next one. Otherwise 2347 * hold-over the cookie for the one we were not 2348 * able to accomodate. 2349 */ 2350 if (bigenough) { 2351 cookie.nfsuquad[0] = *tl++; 2352 if (v3) 2353 cookie.nfsuquad[1] = *tl++; 2354 } else if (v3) { 2355 tl += 2; 2356 } else { 2357 tl++; 2358 } 2359 more_dirs = fxdr_unsigned(int, *tl); 2360 } 2361 /* 2362 * If at end of rpc data, get the eof boolean 2363 */ 2364 if (!more_dirs) { 2365 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2366 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2367 } 2368 m_freem(mrep); 2369 } 2370 /* 2371 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2372 * by increasing d_reclen for the last record. 2373 */ 2374 if (blksiz > 0) { 2375 left = DIRBLKSIZ - blksiz; 2376 dp->nfs_reclen += left; 2377 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2378 uiop->uio_iov->iov_len -= left; 2379 uiop->uio_offset += left; 2380 uiop->uio_resid -= left; 2381 } 2382 2383 if (bigenough) { 2384 /* 2385 * We hit the end of the directory, update direofoffset. 2386 */ 2387 dnp->n_direofoffset = uiop->uio_offset; 2388 } else { 2389 /* 2390 * There is more to go, insert the link cookie so the 2391 * next block can be read. 2392 */ 2393 if (uiop->uio_resid > 0) 2394 kprintf("EEK! readdirrpc resid > 0\n"); 2395 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2396 *cookiep = cookie; 2397 } 2398 nfsmout: 2399 return (error); 2400 } 2401 2402 /* 2403 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2404 */ 2405 int 2406 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2407 { 2408 int len, left; 2409 struct nfs_dirent *dp; 2410 u_int32_t *tl; 2411 caddr_t cp; 2412 int32_t t1, t2; 2413 struct vnode *newvp; 2414 nfsuint64 *cookiep; 2415 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2416 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2417 nfsuint64 cookie; 2418 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2419 struct nfsnode *dnp = VTONFS(vp), *np; 2420 nfsfh_t *fhp; 2421 u_quad_t fileno; 2422 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2423 int attrflag, fhsize; 2424 struct nchandle nch; 2425 struct nchandle dnch; 2426 struct nlcomponent nlc; 2427 2428 #ifndef nolint 2429 dp = NULL; 2430 #endif 2431 #ifndef DIAGNOSTIC 2432 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2433 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2434 panic("nfs readdirplusrpc bad uio"); 2435 #endif 2436 /* 2437 * Obtain the namecache record for the directory so we have something 2438 * to use as a basis for creating the entries. This function will 2439 * return a held (but not locked) ncp. The ncp may be disconnected 2440 * from the tree and cannot be used for upward traversals, and the 2441 * ncp may be unnamed. Note that other unrelated operations may 2442 * cause the ncp to be named at any time. 2443 */ 2444 cache_fromdvp(vp, NULL, 0, &dnch); 2445 bzero(&nlc, sizeof(nlc)); 2446 newvp = NULLVP; 2447 2448 /* 2449 * If there is no cookie, assume directory was stale. 2450 */ 2451 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2452 if (cookiep) 2453 cookie = *cookiep; 2454 else 2455 return (NFSERR_BAD_COOKIE); 2456 /* 2457 * Loop around doing readdir rpc's of size nm_readdirsize 2458 * truncated to a multiple of DIRBLKSIZ. 2459 * The stopping criteria is EOF or buffer full. 2460 */ 2461 while (more_dirs && bigenough) { 2462 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2463 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2464 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2465 nfsm_fhtom(vp, 1); 2466 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2467 *tl++ = cookie.nfsuquad[0]; 2468 *tl++ = cookie.nfsuquad[1]; 2469 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2470 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2471 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2472 *tl = txdr_unsigned(nmp->nm_rsize); 2473 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2474 nfsm_postop_attr(vp, attrflag, NFS_LATTR_NOSHRINK); 2475 if (error) { 2476 m_freem(mrep); 2477 goto nfsmout; 2478 } 2479 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2480 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2481 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2482 more_dirs = fxdr_unsigned(int, *tl); 2483 2484 /* loop thru the dir entries, doctoring them to 4bsd form */ 2485 while (more_dirs && bigenough) { 2486 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2487 fileno = fxdr_hyper(tl); 2488 len = fxdr_unsigned(int, *(tl + 2)); 2489 if (len <= 0 || len > NFS_MAXNAMLEN) { 2490 error = EBADRPC; 2491 m_freem(mrep); 2492 goto nfsmout; 2493 } 2494 tlen = nfsm_rndup(len); 2495 if (tlen == len) 2496 tlen += 4; /* To ensure null termination*/ 2497 left = DIRBLKSIZ - blksiz; 2498 if ((tlen + sizeof(struct nfs_dirent)) > left) { 2499 dp->nfs_reclen += left; 2500 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2501 uiop->uio_iov->iov_len -= left; 2502 uiop->uio_offset += left; 2503 uiop->uio_resid -= left; 2504 blksiz = 0; 2505 } 2506 if ((tlen + sizeof(struct nfs_dirent)) > uiop->uio_resid) 2507 bigenough = 0; 2508 if (bigenough) { 2509 dp = (struct nfs_dirent *)uiop->uio_iov->iov_base; 2510 dp->nfs_ino = fileno; 2511 dp->nfs_namlen = len; 2512 dp->nfs_reclen = tlen + sizeof(struct nfs_dirent); 2513 dp->nfs_type = DT_UNKNOWN; 2514 blksiz += dp->nfs_reclen; 2515 if (blksiz == DIRBLKSIZ) 2516 blksiz = 0; 2517 uiop->uio_offset += sizeof(struct nfs_dirent); 2518 uiop->uio_resid -= sizeof(struct nfs_dirent); 2519 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + sizeof(struct nfs_dirent); 2520 uiop->uio_iov->iov_len -= sizeof(struct nfs_dirent); 2521 nlc.nlc_nameptr = uiop->uio_iov->iov_base; 2522 nlc.nlc_namelen = len; 2523 nfsm_mtouio(uiop, len); 2524 cp = uiop->uio_iov->iov_base; 2525 tlen -= len; 2526 *cp = '\0'; 2527 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + tlen; 2528 uiop->uio_iov->iov_len -= tlen; 2529 uiop->uio_offset += tlen; 2530 uiop->uio_resid -= tlen; 2531 } else 2532 nfsm_adv(nfsm_rndup(len)); 2533 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2534 if (bigenough) { 2535 cookie.nfsuquad[0] = *tl++; 2536 cookie.nfsuquad[1] = *tl++; 2537 } else 2538 tl += 2; 2539 2540 /* 2541 * Since the attributes are before the file handle 2542 * (sigh), we must skip over the attributes and then 2543 * come back and get them. 2544 */ 2545 attrflag = fxdr_unsigned(int, *tl); 2546 if (attrflag) { 2547 dpossav1 = dpos; 2548 mdsav1 = md; 2549 nfsm_adv(NFSX_V3FATTR); 2550 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2551 doit = fxdr_unsigned(int, *tl); 2552 if (doit) { 2553 nfsm_getfh(fhp, fhsize, 1); 2554 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2555 vref(vp); 2556 newvp = vp; 2557 np = dnp; 2558 } else { 2559 error = nfs_nget(vp->v_mount, fhp, 2560 fhsize, &np); 2561 if (error) 2562 doit = 0; 2563 else 2564 newvp = NFSTOV(np); 2565 } 2566 } 2567 if (doit && bigenough) { 2568 dpossav2 = dpos; 2569 dpos = dpossav1; 2570 mdsav2 = md; 2571 md = mdsav1; 2572 nfsm_loadattr(newvp, NULL); 2573 dpos = dpossav2; 2574 md = mdsav2; 2575 dp->nfs_type = 2576 IFTODT(VTTOIF(np->n_vattr.va_type)); 2577 if (dnch.ncp) { 2578 kprintf("NFS/READDIRPLUS, ENTER %*.*s\n", 2579 nlc.nlc_namelen, nlc.nlc_namelen, 2580 nlc.nlc_nameptr); 2581 nch = cache_nlookup(&dnch, &nlc); 2582 cache_setunresolved(&nch); 2583 nfs_cache_setvp(&nch, newvp, 2584 nfspos_cache_timeout); 2585 cache_put(&nch); 2586 } else { 2587 kprintf("NFS/READDIRPLUS, UNABLE TO ENTER" 2588 " %*.*s\n", 2589 nlc.nlc_namelen, nlc.nlc_namelen, 2590 nlc.nlc_nameptr); 2591 } 2592 } 2593 } else { 2594 /* Just skip over the file handle */ 2595 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2596 i = fxdr_unsigned(int, *tl); 2597 nfsm_adv(nfsm_rndup(i)); 2598 } 2599 if (newvp != NULLVP) { 2600 if (newvp == vp) 2601 vrele(newvp); 2602 else 2603 vput(newvp); 2604 newvp = NULLVP; 2605 } 2606 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2607 more_dirs = fxdr_unsigned(int, *tl); 2608 } 2609 /* 2610 * If at end of rpc data, get the eof boolean 2611 */ 2612 if (!more_dirs) { 2613 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2614 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2615 } 2616 m_freem(mrep); 2617 } 2618 /* 2619 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2620 * by increasing d_reclen for the last record. 2621 */ 2622 if (blksiz > 0) { 2623 left = DIRBLKSIZ - blksiz; 2624 dp->nfs_reclen += left; 2625 uiop->uio_iov->iov_base = (char *)uiop->uio_iov->iov_base + left; 2626 uiop->uio_iov->iov_len -= left; 2627 uiop->uio_offset += left; 2628 uiop->uio_resid -= left; 2629 } 2630 2631 /* 2632 * We are now either at the end of the directory or have filled the 2633 * block. 2634 */ 2635 if (bigenough) 2636 dnp->n_direofoffset = uiop->uio_offset; 2637 else { 2638 if (uiop->uio_resid > 0) 2639 kprintf("EEK! readdirplusrpc resid > 0\n"); 2640 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2641 *cookiep = cookie; 2642 } 2643 nfsmout: 2644 if (newvp != NULLVP) { 2645 if (newvp == vp) 2646 vrele(newvp); 2647 else 2648 vput(newvp); 2649 newvp = NULLVP; 2650 } 2651 if (dnch.ncp) 2652 cache_drop(&dnch); 2653 return (error); 2654 } 2655 2656 /* 2657 * Silly rename. To make the NFS filesystem that is stateless look a little 2658 * more like the "ufs" a remove of an active vnode is translated to a rename 2659 * to a funny looking filename that is removed by nfs_inactive on the 2660 * nfsnode. There is the potential for another process on a different client 2661 * to create the same funny name between the nfs_lookitup() fails and the 2662 * nfs_rename() completes, but... 2663 */ 2664 static int 2665 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) 2666 { 2667 struct sillyrename *sp; 2668 struct nfsnode *np; 2669 int error; 2670 2671 /* 2672 * We previously purged dvp instead of vp. I don't know why, it 2673 * completely destroys performance. We can't do it anyway with the 2674 * new VFS API since we would be breaking the namecache topology. 2675 */ 2676 cache_purge(vp); /* XXX */ 2677 np = VTONFS(vp); 2678 #ifndef DIAGNOSTIC 2679 if (vp->v_type == VDIR) 2680 panic("nfs: sillyrename dir"); 2681 #endif 2682 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2683 M_NFSREQ, M_WAITOK); 2684 sp->s_cred = crdup(cnp->cn_cred); 2685 sp->s_dvp = dvp; 2686 vref(dvp); 2687 2688 /* Fudge together a funny name */ 2689 sp->s_namlen = ksprintf(sp->s_name, ".nfsA%08x4.4", 2690 (int)(intptr_t)cnp->cn_td); 2691 2692 /* Try lookitups until we get one that isn't there */ 2693 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2694 cnp->cn_td, NULL) == 0) { 2695 sp->s_name[4]++; 2696 if (sp->s_name[4] > 'z') { 2697 error = EINVAL; 2698 goto bad; 2699 } 2700 } 2701 error = nfs_renameit(dvp, cnp, sp); 2702 if (error) 2703 goto bad; 2704 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2705 cnp->cn_td, &np); 2706 np->n_sillyrename = sp; 2707 return (0); 2708 bad: 2709 vrele(sp->s_dvp); 2710 crfree(sp->s_cred); 2711 kfree((caddr_t)sp, M_NFSREQ); 2712 return (error); 2713 } 2714 2715 /* 2716 * Look up a file name and optionally either update the file handle or 2717 * allocate an nfsnode, depending on the value of npp. 2718 * npp == NULL --> just do the lookup 2719 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2720 * handled too 2721 * *npp != NULL --> update the file handle in the vnode 2722 */ 2723 static int 2724 nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, 2725 struct thread *td, struct nfsnode **npp) 2726 { 2727 u_int32_t *tl; 2728 caddr_t cp; 2729 int32_t t1, t2; 2730 struct vnode *newvp = NULL; 2731 struct nfsnode *np, *dnp = VTONFS(dvp); 2732 caddr_t bpos, dpos, cp2; 2733 int error = 0, fhlen, attrflag; 2734 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2735 nfsfh_t *nfhp; 2736 int v3 = NFS_ISV3(dvp); 2737 2738 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2739 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2740 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2741 nfsm_fhtom(dvp, v3); 2742 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2743 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2744 if (npp && !error) { 2745 nfsm_getfh(nfhp, fhlen, v3); 2746 if (*npp) { 2747 np = *npp; 2748 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2749 kfree((caddr_t)np->n_fhp, M_NFSBIGFH); 2750 np->n_fhp = &np->n_fh; 2751 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2752 np->n_fhp =(nfsfh_t *)kmalloc(fhlen,M_NFSBIGFH,M_WAITOK); 2753 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2754 np->n_fhsize = fhlen; 2755 newvp = NFSTOV(np); 2756 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2757 vref(dvp); 2758 newvp = dvp; 2759 } else { 2760 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2761 if (error) { 2762 m_freem(mrep); 2763 return (error); 2764 } 2765 newvp = NFSTOV(np); 2766 } 2767 if (v3) { 2768 nfsm_postop_attr(newvp, attrflag, NFS_LATTR_NOSHRINK); 2769 if (!attrflag && *npp == NULL) { 2770 m_freem(mrep); 2771 if (newvp == dvp) 2772 vrele(newvp); 2773 else 2774 vput(newvp); 2775 return (ENOENT); 2776 } 2777 } else 2778 nfsm_loadattr(newvp, NULL); 2779 } 2780 m_freem(mrep); 2781 nfsmout: 2782 if (npp && *npp == NULL) { 2783 if (error) { 2784 if (newvp) { 2785 if (newvp == dvp) 2786 vrele(newvp); 2787 else 2788 vput(newvp); 2789 } 2790 } else 2791 *npp = np; 2792 } 2793 return (error); 2794 } 2795 2796 /* 2797 * Nfs Version 3 commit rpc 2798 */ 2799 int 2800 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2801 { 2802 caddr_t cp; 2803 u_int32_t *tl; 2804 int32_t t1, t2; 2805 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2806 caddr_t bpos, dpos, cp2; 2807 int error = 0, wccflag = NFSV3_WCCRATTR; 2808 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2809 2810 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2811 return (0); 2812 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2813 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2814 nfsm_fhtom(vp, 1); 2815 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2816 txdr_hyper(offset, tl); 2817 tl += 2; 2818 *tl = txdr_unsigned(cnt); 2819 nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); 2820 nfsm_wcc_data(vp, wccflag); 2821 if (!error) { 2822 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2823 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2824 NFSX_V3WRITEVERF)) { 2825 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2826 NFSX_V3WRITEVERF); 2827 error = NFSERR_STALEWRITEVERF; 2828 } 2829 } 2830 m_freem(mrep); 2831 nfsmout: 2832 return (error); 2833 } 2834 2835 /* 2836 * Kludge City.. 2837 * - make nfs_bmap() essentially a no-op that does no translation 2838 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2839 * (Maybe I could use the process's page mapping, but I was concerned that 2840 * Kernel Write might not be enabled and also figured copyout() would do 2841 * a lot more work than bcopy() and also it currently happens in the 2842 * context of the swapper process (2). 2843 * 2844 * nfs_bmap(struct vnode *a_vp, off_t a_loffset, 2845 * off_t *a_doffsetp, int *a_runp, int *a_runb) 2846 */ 2847 static int 2848 nfs_bmap(struct vop_bmap_args *ap) 2849 { 2850 if (ap->a_doffsetp != NULL) 2851 *ap->a_doffsetp = ap->a_loffset; 2852 if (ap->a_runp != NULL) 2853 *ap->a_runp = 0; 2854 if (ap->a_runb != NULL) 2855 *ap->a_runb = 0; 2856 return (0); 2857 } 2858 2859 /* 2860 * Strategy routine. 2861 * 2862 * For async requests when nfsiod(s) are running, queue the request by 2863 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2864 * request. 2865 */ 2866 static int 2867 nfs_strategy(struct vop_strategy_args *ap) 2868 { 2869 struct bio *bio = ap->a_bio; 2870 struct bio *nbio; 2871 struct buf *bp = bio->bio_buf; 2872 struct thread *td; 2873 int error = 0; 2874 2875 KASSERT(bp->b_cmd != BUF_CMD_DONE, 2876 ("nfs_strategy: buffer %p unexpectedly marked done", bp)); 2877 KASSERT(BUF_REFCNT(bp) > 0, 2878 ("nfs_strategy: buffer %p not locked", bp)); 2879 2880 if (bp->b_flags & B_ASYNC) 2881 td = NULL; 2882 else 2883 td = curthread; /* XXX */ 2884 2885 /* 2886 * We probably don't need to push an nbio any more since no 2887 * block conversion is required due to the use of 64 bit byte 2888 * offsets, but do it anyway. 2889 */ 2890 nbio = push_bio(bio); 2891 nbio->bio_offset = bio->bio_offset; 2892 2893 /* 2894 * If the op is asynchronous and an i/o daemon is waiting 2895 * queue the request, wake it up and wait for completion 2896 * otherwise just do it ourselves. 2897 */ 2898 if ((bp->b_flags & B_ASYNC) == 0 || nfs_asyncio(ap->a_vp, nbio, td)) 2899 error = nfs_doio(ap->a_vp, nbio, td); 2900 return (error); 2901 } 2902 2903 /* 2904 * Mmap a file 2905 * 2906 * NB Currently unsupported. 2907 * 2908 * nfs_mmap(struct vnode *a_vp, int a_fflags, struct ucred *a_cred) 2909 */ 2910 /* ARGSUSED */ 2911 static int 2912 nfs_mmap(struct vop_mmap_args *ap) 2913 { 2914 return (EINVAL); 2915 } 2916 2917 /* 2918 * fsync vnode op. Just call nfs_flush() with commit == 1. 2919 * 2920 * nfs_fsync(struct vnode *a_vp, int a_waitfor) 2921 */ 2922 /* ARGSUSED */ 2923 static int 2924 nfs_fsync(struct vop_fsync_args *ap) 2925 { 2926 return (nfs_flush(ap->a_vp, ap->a_waitfor, curthread, 1)); 2927 } 2928 2929 /* 2930 * Flush all the blocks associated with a vnode. Dirty NFS buffers may be 2931 * in one of two states: If B_NEEDCOMMIT is clear then the buffer contains 2932 * new NFS data which needs to be written to the server. If B_NEEDCOMMIT is 2933 * set the buffer contains data that has already been written to the server 2934 * and which now needs a commit RPC. 2935 * 2936 * If commit is 0 we only take one pass and only flush buffers containing new 2937 * dirty data. 2938 * 2939 * If commit is 1 we take two passes, issuing a commit RPC in the second 2940 * pass. 2941 * 2942 * If waitfor is MNT_WAIT and commit is 1, we loop as many times as required 2943 * to completely flush all pending data. 2944 * 2945 * Note that the RB_SCAN code properly handles the case where the 2946 * callback might block and directly or indirectly (another thread) cause 2947 * the RB tree to change. 2948 */ 2949 2950 #ifndef NFS_COMMITBVECSIZ 2951 #define NFS_COMMITBVECSIZ 16 2952 #endif 2953 2954 struct nfs_flush_info { 2955 enum { NFI_FLUSHNEW, NFI_COMMIT } mode; 2956 struct thread *td; 2957 struct vnode *vp; 2958 int waitfor; 2959 int slpflag; 2960 int slptimeo; 2961 int loops; 2962 struct buf *bvary[NFS_COMMITBVECSIZ]; 2963 int bvsize; 2964 off_t beg_off; 2965 off_t end_off; 2966 }; 2967 2968 static int nfs_flush_bp(struct buf *bp, void *data); 2969 static int nfs_flush_docommit(struct nfs_flush_info *info, int error); 2970 2971 int 2972 nfs_flush(struct vnode *vp, int waitfor, struct thread *td, int commit) 2973 { 2974 struct nfsnode *np = VTONFS(vp); 2975 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2976 struct nfs_flush_info info; 2977 int error; 2978 2979 bzero(&info, sizeof(info)); 2980 info.td = td; 2981 info.vp = vp; 2982 info.waitfor = waitfor; 2983 info.slpflag = (nmp->nm_flag & NFSMNT_INT) ? PCATCH : 0; 2984 info.loops = 0; 2985 2986 do { 2987 /* 2988 * Flush mode 2989 */ 2990 info.mode = NFI_FLUSHNEW; 2991 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 2992 nfs_flush_bp, &info); 2993 2994 /* 2995 * Take a second pass if committing and no error occured. 2996 * Clean up any left over collection (whether an error 2997 * occurs or not). 2998 */ 2999 if (commit && error == 0) { 3000 info.mode = NFI_COMMIT; 3001 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL, 3002 nfs_flush_bp, &info); 3003 if (info.bvsize) 3004 error = nfs_flush_docommit(&info, error); 3005 } 3006 3007 /* 3008 * Wait for pending I/O to complete before checking whether 3009 * any further dirty buffers exist. 3010 */ 3011 while (waitfor == MNT_WAIT && vp->v_track_write.bk_active) { 3012 vp->v_track_write.bk_waitflag = 1; 3013 error = tsleep(&vp->v_track_write, 3014 info.slpflag, "nfsfsync", info.slptimeo); 3015 if (error) { 3016 /* 3017 * We have to be able to break out if this 3018 * is an 'intr' mount. 3019 */ 3020 if (nfs_sigintr(nmp, NULL, td)) { 3021 error = -EINTR; 3022 break; 3023 } 3024 3025 /* 3026 * Since we do not process pending signals, 3027 * once we get a PCATCH our tsleep() will no 3028 * longer sleep, switch to a fixed timeout 3029 * instead. 3030 */ 3031 if (info.slpflag == PCATCH) { 3032 info.slpflag = 0; 3033 info.slptimeo = 2 * hz; 3034 } 3035 error = 0; 3036 } 3037 } 3038 ++info.loops; 3039 /* 3040 * Loop if we are flushing synchronous as well as committing, 3041 * and dirty buffers are still present. Otherwise we might livelock. 3042 */ 3043 } while (waitfor == MNT_WAIT && commit && 3044 error == 0 && !RB_EMPTY(&vp->v_rbdirty_tree)); 3045 3046 /* 3047 * The callbacks have to return a negative error to terminate the 3048 * RB scan. 3049 */ 3050 if (error < 0) 3051 error = -error; 3052 3053 /* 3054 * Deal with any error collection 3055 */ 3056 if (np->n_flag & NWRITEERR) { 3057 error = np->n_error; 3058 np->n_flag &= ~NWRITEERR; 3059 } 3060 return (error); 3061 } 3062 3063 3064 static 3065 int 3066 nfs_flush_bp(struct buf *bp, void *data) 3067 { 3068 struct nfs_flush_info *info = data; 3069 off_t toff; 3070 int error; 3071 3072 error = 0; 3073 switch(info->mode) { 3074 case NFI_FLUSHNEW: 3075 crit_enter(); 3076 if (info->loops && info->waitfor == MNT_WAIT) { 3077 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3078 if (error) { 3079 int lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL; 3080 if (info->slpflag & PCATCH) 3081 lkflags |= LK_PCATCH; 3082 error = BUF_TIMELOCK(bp, lkflags, "nfsfsync", 3083 info->slptimeo); 3084 } 3085 } else { 3086 error = BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT); 3087 } 3088 if (error == 0) { 3089 KKASSERT(bp->b_vp == info->vp); 3090 3091 if ((bp->b_flags & B_DELWRI) == 0) 3092 panic("nfs_fsync: not dirty"); 3093 if (bp->b_flags & B_NEEDCOMMIT) { 3094 BUF_UNLOCK(bp); 3095 crit_exit(); 3096 break; 3097 } 3098 bremfree(bp); 3099 3100 crit_exit(); 3101 bawrite(bp); 3102 } else { 3103 crit_exit(); 3104 error = 0; 3105 } 3106 break; 3107 case NFI_COMMIT: 3108 /* 3109 * Only process buffers in need of a commit which we can 3110 * immediately lock. This may prevent a buffer from being 3111 * committed, but the normal flush loop will block on the 3112 * same buffer so we shouldn't get into an endless loop. 3113 */ 3114 crit_enter(); 3115 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 3116 (B_DELWRI | B_NEEDCOMMIT) || 3117 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 3118 crit_exit(); 3119 break; 3120 } 3121 3122 KKASSERT(bp->b_vp == info->vp); 3123 bremfree(bp); 3124 3125 /* 3126 * NOTE: storing the bp in the bvary[] basically sets 3127 * it up for a commit operation. 3128 * 3129 * We must call vfs_busy_pages() now so the commit operation 3130 * is interlocked with user modifications to memory mapped 3131 * pages. 3132 * 3133 * Note: to avoid loopback deadlocks, we do not 3134 * assign b_runningbufspace. 3135 */ 3136 bp->b_cmd = BUF_CMD_WRITE; 3137 vfs_busy_pages(bp->b_vp, bp); 3138 info->bvary[info->bvsize] = bp; 3139 toff = bp->b_bio2.bio_offset + bp->b_dirtyoff; 3140 if (info->bvsize == 0 || toff < info->beg_off) 3141 info->beg_off = toff; 3142 toff += (off_t)(bp->b_dirtyend - bp->b_dirtyoff); 3143 if (info->bvsize == 0 || toff > info->end_off) 3144 info->end_off = toff; 3145 ++info->bvsize; 3146 if (info->bvsize == NFS_COMMITBVECSIZ) { 3147 error = nfs_flush_docommit(info, 0); 3148 KKASSERT(info->bvsize == 0); 3149 } 3150 crit_exit(); 3151 } 3152 return (error); 3153 } 3154 3155 static 3156 int 3157 nfs_flush_docommit(struct nfs_flush_info *info, int error) 3158 { 3159 struct vnode *vp; 3160 struct buf *bp; 3161 off_t bytes; 3162 int retv; 3163 int i; 3164 3165 vp = info->vp; 3166 3167 if (info->bvsize > 0) { 3168 /* 3169 * Commit data on the server, as required. Note that 3170 * nfs_commit will use the vnode's cred for the commit. 3171 * The NFSv3 commit RPC is limited to a 32 bit byte count. 3172 */ 3173 bytes = info->end_off - info->beg_off; 3174 if (bytes > 0x40000000) 3175 bytes = 0x40000000; 3176 if (error) { 3177 retv = -error; 3178 } else { 3179 retv = nfs_commit(vp, info->beg_off, 3180 (int)bytes, info->td); 3181 if (retv == NFSERR_STALEWRITEVERF) 3182 nfs_clearcommit(vp->v_mount); 3183 } 3184 3185 /* 3186 * Now, either mark the blocks I/O done or mark the 3187 * blocks dirty, depending on whether the commit 3188 * succeeded. 3189 */ 3190 for (i = 0; i < info->bvsize; ++i) { 3191 bp = info->bvary[i]; 3192 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 3193 if (retv) { 3194 /* 3195 * Error, leave B_DELWRI intact 3196 */ 3197 vfs_unbusy_pages(bp); 3198 bp->b_cmd = BUF_CMD_DONE; 3199 brelse(bp); 3200 } else { 3201 /* 3202 * Success, remove B_DELWRI ( bundirty() ). 3203 * 3204 * b_dirtyoff/b_dirtyend seem to be NFS 3205 * specific. We should probably move that 3206 * into bundirty(). XXX 3207 * 3208 * We are faking an I/O write, we have to 3209 * start the transaction in order to 3210 * immediately biodone() it. 3211 */ 3212 crit_enter(); 3213 bp->b_flags |= B_ASYNC; 3214 bundirty(bp); 3215 bp->b_flags &= ~B_ERROR; 3216 bp->b_dirtyoff = bp->b_dirtyend = 0; 3217 crit_exit(); 3218 biodone(&bp->b_bio1); 3219 } 3220 } 3221 info->bvsize = 0; 3222 } 3223 return (error); 3224 } 3225 3226 /* 3227 * NFS advisory byte-level locks. 3228 * Currently unsupported. 3229 * 3230 * nfs_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, struct flock *a_fl, 3231 * int a_flags) 3232 */ 3233 static int 3234 nfs_advlock(struct vop_advlock_args *ap) 3235 { 3236 struct nfsnode *np = VTONFS(ap->a_vp); 3237 3238 /* 3239 * The following kludge is to allow diskless support to work 3240 * until a real NFS lockd is implemented. Basically, just pretend 3241 * that this is a local lock. 3242 */ 3243 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3244 } 3245 3246 /* 3247 * Print out the contents of an nfsnode. 3248 * 3249 * nfs_print(struct vnode *a_vp) 3250 */ 3251 static int 3252 nfs_print(struct vop_print_args *ap) 3253 { 3254 struct vnode *vp = ap->a_vp; 3255 struct nfsnode *np = VTONFS(vp); 3256 3257 kprintf("tag VT_NFS, fileid %lld fsid 0x%x", 3258 (long long)np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3259 if (vp->v_type == VFIFO) 3260 fifo_printinfo(vp); 3261 kprintf("\n"); 3262 return (0); 3263 } 3264 3265 /* 3266 * nfs special file access vnode op. 3267 * Essentially just get vattr and then imitate iaccess() since the device is 3268 * local to the client. 3269 * 3270 * nfsspec_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred) 3271 */ 3272 static int 3273 nfsspec_access(struct vop_access_args *ap) 3274 { 3275 struct vattr *vap; 3276 gid_t *gp; 3277 struct ucred *cred = ap->a_cred; 3278 struct vnode *vp = ap->a_vp; 3279 mode_t mode = ap->a_mode; 3280 struct vattr vattr; 3281 int i; 3282 int error; 3283 3284 /* 3285 * Disallow write attempts on filesystems mounted read-only; 3286 * unless the file is a socket, fifo, or a block or character 3287 * device resident on the filesystem. 3288 */ 3289 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3290 switch (vp->v_type) { 3291 case VREG: 3292 case VDIR: 3293 case VLNK: 3294 return (EROFS); 3295 default: 3296 break; 3297 } 3298 } 3299 /* 3300 * If you're the super-user, 3301 * you always get access. 3302 */ 3303 if (cred->cr_uid == 0) 3304 return (0); 3305 vap = &vattr; 3306 error = VOP_GETATTR(vp, vap); 3307 if (error) 3308 return (error); 3309 /* 3310 * Access check is based on only one of owner, group, public. 3311 * If not owner, then check group. If not a member of the 3312 * group, then check public access. 3313 */ 3314 if (cred->cr_uid != vap->va_uid) { 3315 mode >>= 3; 3316 gp = cred->cr_groups; 3317 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3318 if (vap->va_gid == *gp) 3319 goto found; 3320 mode >>= 3; 3321 found: 3322 ; 3323 } 3324 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3325 return (error); 3326 } 3327 3328 /* 3329 * Read wrapper for special devices. 3330 * 3331 * nfsspec_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3332 * struct ucred *a_cred) 3333 */ 3334 static int 3335 nfsspec_read(struct vop_read_args *ap) 3336 { 3337 struct nfsnode *np = VTONFS(ap->a_vp); 3338 3339 /* 3340 * Set access flag. 3341 */ 3342 np->n_flag |= NACC; 3343 getnanotime(&np->n_atim); 3344 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3345 } 3346 3347 /* 3348 * Write wrapper for special devices. 3349 * 3350 * nfsspec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3351 * struct ucred *a_cred) 3352 */ 3353 static int 3354 nfsspec_write(struct vop_write_args *ap) 3355 { 3356 struct nfsnode *np = VTONFS(ap->a_vp); 3357 3358 /* 3359 * Set update flag. 3360 */ 3361 np->n_flag |= NUPD; 3362 getnanotime(&np->n_mtim); 3363 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3364 } 3365 3366 /* 3367 * Close wrapper for special devices. 3368 * 3369 * Update the times on the nfsnode then do device close. 3370 * 3371 * nfsspec_close(struct vnode *a_vp, int a_fflag) 3372 */ 3373 static int 3374 nfsspec_close(struct vop_close_args *ap) 3375 { 3376 struct vnode *vp = ap->a_vp; 3377 struct nfsnode *np = VTONFS(vp); 3378 struct vattr vattr; 3379 3380 if (np->n_flag & (NACC | NUPD)) { 3381 np->n_flag |= NCHG; 3382 if (vp->v_sysref.refcnt == 1 && 3383 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3384 VATTR_NULL(&vattr); 3385 if (np->n_flag & NACC) 3386 vattr.va_atime = np->n_atim; 3387 if (np->n_flag & NUPD) 3388 vattr.va_mtime = np->n_mtim; 3389 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3390 } 3391 } 3392 return (VOCALL(&spec_vnode_vops, &ap->a_head)); 3393 } 3394 3395 /* 3396 * Read wrapper for fifos. 3397 * 3398 * nfsfifo_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3399 * struct ucred *a_cred) 3400 */ 3401 static int 3402 nfsfifo_read(struct vop_read_args *ap) 3403 { 3404 struct nfsnode *np = VTONFS(ap->a_vp); 3405 3406 /* 3407 * Set access flag. 3408 */ 3409 np->n_flag |= NACC; 3410 getnanotime(&np->n_atim); 3411 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3412 } 3413 3414 /* 3415 * Write wrapper for fifos. 3416 * 3417 * nfsfifo_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 3418 * struct ucred *a_cred) 3419 */ 3420 static int 3421 nfsfifo_write(struct vop_write_args *ap) 3422 { 3423 struct nfsnode *np = VTONFS(ap->a_vp); 3424 3425 /* 3426 * Set update flag. 3427 */ 3428 np->n_flag |= NUPD; 3429 getnanotime(&np->n_mtim); 3430 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3431 } 3432 3433 /* 3434 * Close wrapper for fifos. 3435 * 3436 * Update the times on the nfsnode then do fifo close. 3437 * 3438 * nfsfifo_close(struct vnode *a_vp, int a_fflag) 3439 */ 3440 static int 3441 nfsfifo_close(struct vop_close_args *ap) 3442 { 3443 struct vnode *vp = ap->a_vp; 3444 struct nfsnode *np = VTONFS(vp); 3445 struct vattr vattr; 3446 struct timespec ts; 3447 3448 if (np->n_flag & (NACC | NUPD)) { 3449 getnanotime(&ts); 3450 if (np->n_flag & NACC) 3451 np->n_atim = ts; 3452 if (np->n_flag & NUPD) 3453 np->n_mtim = ts; 3454 np->n_flag |= NCHG; 3455 if (vp->v_sysref.refcnt == 1 && 3456 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3457 VATTR_NULL(&vattr); 3458 if (np->n_flag & NACC) 3459 vattr.va_atime = np->n_atim; 3460 if (np->n_flag & NUPD) 3461 vattr.va_mtime = np->n_mtim; 3462 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE)); 3463 } 3464 } 3465 return (VOCALL(&fifo_vnode_vops, &ap->a_head)); 3466 } 3467 3468