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