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 1.14 2003/10/10 22:01:13 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/socket.h> 59 #include <sys/vnode.h> 60 #include <sys/dirent.h> 61 #include <sys/fcntl.h> 62 #include <sys/lockf.h> 63 #include <sys/stat.h> 64 #include <sys/sysctl.h> 65 #include <sys/conf.h> 66 67 #include <vm/vm.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_zone.h> 70 71 #include <sys/buf2.h> 72 73 #include <vfs/fifofs/fifo.h> 74 75 #include "rpcv2.h" 76 #include "nfsproto.h" 77 #include "nfs.h" 78 #include "nfsmount.h" 79 #include "nfsnode.h" 80 #include "xdr_subs.h" 81 #include "nfsm_subs.h" 82 #include "nqnfs.h" 83 84 #include <net/if.h> 85 #include <netinet/in.h> 86 #include <netinet/in_var.h> 87 88 /* Defs */ 89 #define TRUE 1 90 #define FALSE 0 91 92 /* 93 * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these 94 * calls are not in getblk() and brelse() so that they would not be necessary 95 * here. 96 */ 97 #ifndef B_VMIO 98 #define vfs_busy_pages(bp, f) 99 #endif 100 101 static int nfsspec_read (struct vop_read_args *); 102 static int nfsspec_write (struct vop_write_args *); 103 static int nfsfifo_read (struct vop_read_args *); 104 static int nfsfifo_write (struct vop_write_args *); 105 static int nfsspec_close (struct vop_close_args *); 106 static int nfsfifo_close (struct vop_close_args *); 107 #define nfs_poll vop_nopoll 108 static int nfs_flush (struct vnode *,int,struct thread *,int); 109 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 110 static int nfs_lookup (struct vop_lookup_args *); 111 static int nfs_create (struct vop_create_args *); 112 static int nfs_mknod (struct vop_mknod_args *); 113 static int nfs_open (struct vop_open_args *); 114 static int nfs_close (struct vop_close_args *); 115 static int nfs_access (struct vop_access_args *); 116 static int nfs_getattr (struct vop_getattr_args *); 117 static int nfs_setattr (struct vop_setattr_args *); 118 static int nfs_read (struct vop_read_args *); 119 static int nfs_mmap (struct vop_mmap_args *); 120 static int nfs_fsync (struct vop_fsync_args *); 121 static int nfs_remove (struct vop_remove_args *); 122 static int nfs_link (struct vop_link_args *); 123 static int nfs_rename (struct vop_rename_args *); 124 static int nfs_mkdir (struct vop_mkdir_args *); 125 static int nfs_rmdir (struct vop_rmdir_args *); 126 static int nfs_symlink (struct vop_symlink_args *); 127 static int nfs_readdir (struct vop_readdir_args *); 128 static int nfs_bmap (struct vop_bmap_args *); 129 static int nfs_strategy (struct vop_strategy_args *); 130 static int nfs_lookitup (struct vnode *, const char *, int, 131 struct ucred *, struct thread *, struct nfsnode **); 132 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 133 static int nfsspec_access (struct vop_access_args *); 134 static int nfs_readlink (struct vop_readlink_args *); 135 static int nfs_print (struct vop_print_args *); 136 static int nfs_advlock (struct vop_advlock_args *); 137 static int nfs_bwrite (struct vop_bwrite_args *); 138 /* 139 * Global vfs data structures for nfs 140 */ 141 vop_t **nfsv2_vnodeop_p; 142 static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 143 { &vop_default_desc, (vop_t *) vop_defaultop }, 144 { &vop_access_desc, (vop_t *) nfs_access }, 145 { &vop_advlock_desc, (vop_t *) nfs_advlock }, 146 { &vop_bmap_desc, (vop_t *) nfs_bmap }, 147 { &vop_bwrite_desc, (vop_t *) nfs_bwrite }, 148 { &vop_close_desc, (vop_t *) nfs_close }, 149 { &vop_create_desc, (vop_t *) nfs_create }, 150 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 151 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 152 { &vop_getpages_desc, (vop_t *) nfs_getpages }, 153 { &vop_putpages_desc, (vop_t *) nfs_putpages }, 154 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 155 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 156 { &vop_lease_desc, (vop_t *) vop_null }, 157 { &vop_link_desc, (vop_t *) nfs_link }, 158 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 159 { &vop_lookup_desc, (vop_t *) nfs_lookup }, 160 { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, 161 { &vop_mknod_desc, (vop_t *) nfs_mknod }, 162 { &vop_mmap_desc, (vop_t *) nfs_mmap }, 163 { &vop_open_desc, (vop_t *) nfs_open }, 164 { &vop_poll_desc, (vop_t *) nfs_poll }, 165 { &vop_print_desc, (vop_t *) nfs_print }, 166 { &vop_read_desc, (vop_t *) nfs_read }, 167 { &vop_readdir_desc, (vop_t *) nfs_readdir }, 168 { &vop_readlink_desc, (vop_t *) nfs_readlink }, 169 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 170 { &vop_remove_desc, (vop_t *) nfs_remove }, 171 { &vop_rename_desc, (vop_t *) nfs_rename }, 172 { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, 173 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 174 { &vop_strategy_desc, (vop_t *) nfs_strategy }, 175 { &vop_symlink_desc, (vop_t *) nfs_symlink }, 176 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 177 { &vop_write_desc, (vop_t *) nfs_write }, 178 { NULL, NULL } 179 }; 180 static struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 181 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 182 VNODEOP_SET(nfsv2_vnodeop_opv_desc); 183 184 /* 185 * Special device vnode ops 186 */ 187 vop_t **spec_nfsv2nodeop_p; 188 static struct vnodeopv_entry_desc nfsv2_specop_entries[] = { 189 { &vop_default_desc, (vop_t *) spec_vnoperate }, 190 { &vop_access_desc, (vop_t *) nfsspec_access }, 191 { &vop_close_desc, (vop_t *) nfsspec_close }, 192 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 193 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 194 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 195 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 196 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 197 { &vop_print_desc, (vop_t *) nfs_print }, 198 { &vop_read_desc, (vop_t *) nfsspec_read }, 199 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 200 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 201 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 202 { &vop_write_desc, (vop_t *) nfsspec_write }, 203 { NULL, NULL } 204 }; 205 static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 206 { &spec_nfsv2nodeop_p, nfsv2_specop_entries }; 207 VNODEOP_SET(spec_nfsv2nodeop_opv_desc); 208 209 vop_t **fifo_nfsv2nodeop_p; 210 static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = { 211 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 212 { &vop_access_desc, (vop_t *) nfsspec_access }, 213 { &vop_close_desc, (vop_t *) nfsfifo_close }, 214 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 215 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 216 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 217 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 218 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 219 { &vop_print_desc, (vop_t *) nfs_print }, 220 { &vop_read_desc, (vop_t *) nfsfifo_read }, 221 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 222 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 223 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 224 { &vop_write_desc, (vop_t *) nfsfifo_write }, 225 { NULL, NULL } 226 }; 227 static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 228 { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries }; 229 VNODEOP_SET(fifo_nfsv2nodeop_opv_desc); 230 231 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 232 struct componentname *cnp, 233 struct vattr *vap); 234 static int nfs_removerpc (struct vnode *dvp, const char *name, 235 int namelen, 236 struct ucred *cred, struct thread *td); 237 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 238 int fnamelen, struct vnode *tdvp, 239 const char *tnameptr, int tnamelen, 240 struct ucred *cred, struct thread *td); 241 static int nfs_renameit (struct vnode *sdvp, 242 struct componentname *scnp, 243 struct sillyrename *sp); 244 245 /* 246 * Global variables 247 */ 248 extern u_int32_t nfs_true, nfs_false; 249 extern u_int32_t nfs_xdrneg1; 250 extern struct nfsstats nfsstats; 251 extern nfstype nfsv3_type[9]; 252 struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; 253 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 254 int nfs_numasync = 0; 255 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 256 257 SYSCTL_DECL(_vfs_nfs); 258 259 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 260 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 261 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 262 263 static int nfsv3_commit_on_close = 0; 264 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 265 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 266 #if 0 267 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 268 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 269 270 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 271 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 272 #endif 273 274 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 275 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 276 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 277 static int 278 nfs3_access_otw(struct vnode *vp, int wmode, 279 struct thread *td, struct ucred *cred) 280 { 281 const int v3 = 1; 282 u_int32_t *tl; 283 int error = 0, attrflag; 284 285 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 286 caddr_t bpos, dpos, cp2; 287 int32_t t1, t2; 288 caddr_t cp; 289 u_int32_t rmode; 290 struct nfsnode *np = VTONFS(vp); 291 292 nfsstats.rpccnt[NFSPROC_ACCESS]++; 293 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 294 nfsm_fhtom(vp, v3); 295 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 296 *tl = txdr_unsigned(wmode); 297 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 298 nfsm_postop_attr(vp, attrflag); 299 if (!error) { 300 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 301 rmode = fxdr_unsigned(u_int32_t, *tl); 302 np->n_mode = rmode; 303 np->n_modeuid = cred->cr_uid; 304 np->n_modestamp = time_second; 305 } 306 nfsm_reqdone; 307 return error; 308 } 309 310 /* 311 * nfs access vnode op. 312 * For nfs version 2, just return ok. File accesses may fail later. 313 * For nfs version 3, use the access rpc to check accessibility. If file modes 314 * are changed on the server, accesses might still fail later. 315 */ 316 static int 317 nfs_access(ap) 318 struct vop_access_args /* { 319 struct vnode *a_vp; 320 int a_mode; 321 struct ucred *a_cred; 322 struct thread *a_td; 323 } */ *ap; 324 { 325 struct vnode *vp = ap->a_vp; 326 int error = 0; 327 u_int32_t mode, wmode; 328 int v3 = NFS_ISV3(vp); 329 struct nfsnode *np = VTONFS(vp); 330 331 /* 332 * Disallow write attempts on filesystems mounted read-only; 333 * unless the file is a socket, fifo, or a block or character 334 * device resident on the filesystem. 335 */ 336 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 337 switch (vp->v_type) { 338 case VREG: 339 case VDIR: 340 case VLNK: 341 return (EROFS); 342 default: 343 break; 344 } 345 } 346 /* 347 * For nfs v3, check to see if we have done this recently, and if 348 * so return our cached result instead of making an ACCESS call. 349 * If not, do an access rpc, otherwise you are stuck emulating 350 * ufs_access() locally using the vattr. This may not be correct, 351 * since the server may apply other access criteria such as 352 * client uid-->server uid mapping that we do not know about. 353 */ 354 if (v3) { 355 if (ap->a_mode & VREAD) 356 mode = NFSV3ACCESS_READ; 357 else 358 mode = 0; 359 if (vp->v_type != VDIR) { 360 if (ap->a_mode & VWRITE) 361 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 362 if (ap->a_mode & VEXEC) 363 mode |= NFSV3ACCESS_EXECUTE; 364 } else { 365 if (ap->a_mode & VWRITE) 366 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 367 NFSV3ACCESS_DELETE); 368 if (ap->a_mode & VEXEC) 369 mode |= NFSV3ACCESS_LOOKUP; 370 } 371 /* XXX safety belt, only make blanket request if caching */ 372 if (nfsaccess_cache_timeout > 0) { 373 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 374 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 375 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 376 } else { 377 wmode = mode; 378 } 379 380 /* 381 * Does our cached result allow us to give a definite yes to 382 * this request? 383 */ 384 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 385 (ap->a_cred->cr_uid == np->n_modeuid) && 386 ((np->n_mode & mode) == mode)) { 387 nfsstats.accesscache_hits++; 388 } else { 389 /* 390 * Either a no, or a don't know. Go to the wire. 391 */ 392 nfsstats.accesscache_misses++; 393 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 394 if (!error) { 395 if ((np->n_mode & mode) != mode) { 396 error = EACCES; 397 } 398 } 399 } 400 } else { 401 if ((error = nfsspec_access(ap)) != 0) 402 return (error); 403 404 /* 405 * Attempt to prevent a mapped root from accessing a file 406 * which it shouldn't. We try to read a byte from the file 407 * if the user is root and the file is not zero length. 408 * After calling nfsspec_access, we should have the correct 409 * file size cached. 410 */ 411 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 412 && VTONFS(vp)->n_size > 0) { 413 struct iovec aiov; 414 struct uio auio; 415 char buf[1]; 416 417 aiov.iov_base = buf; 418 aiov.iov_len = 1; 419 auio.uio_iov = &aiov; 420 auio.uio_iovcnt = 1; 421 auio.uio_offset = 0; 422 auio.uio_resid = 1; 423 auio.uio_segflg = UIO_SYSSPACE; 424 auio.uio_rw = UIO_READ; 425 auio.uio_td = ap->a_td; 426 427 if (vp->v_type == VREG) { 428 error = nfs_readrpc(vp, &auio); 429 } else if (vp->v_type == VDIR) { 430 char* bp; 431 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 432 aiov.iov_base = bp; 433 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 434 error = nfs_readdirrpc(vp, &auio); 435 free(bp, M_TEMP); 436 } else if (vp->v_type == VLNK) { 437 error = nfs_readlinkrpc(vp, &auio); 438 } else { 439 error = EACCES; 440 } 441 } 442 } 443 /* 444 * [re]record creds for reading and/or writing if access 445 * was granted. 446 */ 447 if (error == 0) { 448 if ((ap->a_mode & VREAD) && ap->a_cred != np->n_rucred) { 449 crhold(ap->a_cred); 450 if (np->n_rucred) 451 crfree(np->n_rucred); 452 np->n_rucred = ap->a_cred; 453 } 454 if ((ap->a_mode & VWRITE) && ap->a_cred != np->n_wucred) { 455 crhold(ap->a_cred); 456 if (np->n_wucred) 457 crfree(np->n_wucred); 458 np->n_wucred = ap->a_cred; 459 } 460 } 461 return(error); 462 } 463 464 /* 465 * nfs open vnode op 466 * Check to see if the type is ok 467 * and that deletion is not in progress. 468 * For paged in text files, you will need to flush the page cache 469 * if consistency is lost. 470 */ 471 /* ARGSUSED */ 472 static int 473 nfs_open(ap) 474 struct vop_open_args /* { 475 struct vnode *a_vp; 476 int a_mode; 477 struct ucred *a_cred; 478 struct thread *a_td; 479 } */ *ap; 480 { 481 struct vnode *vp = ap->a_vp; 482 struct nfsnode *np = VTONFS(vp); 483 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 484 struct vattr vattr; 485 int error; 486 487 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 488 #ifdef DIAGNOSTIC 489 printf("open eacces vtyp=%d\n",vp->v_type); 490 #endif 491 return (EACCES); 492 } 493 /* 494 * Get a valid lease. If cached data is stale, flush it. 495 */ 496 if (nmp->nm_flag & NFSMNT_NQNFS) { 497 if (NQNFS_CKINVALID(vp, np, ND_READ)) { 498 do { 499 error = nqnfs_getlease(vp, ND_READ, ap->a_td); 500 } while (error == NQNFS_EXPIRED); 501 if (error) 502 return (error); 503 if (np->n_lrev != np->n_brev || 504 (np->n_flag & NQNFSNONCACHE)) { 505 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) 506 == EINTR) { 507 return (error); 508 } 509 np->n_brev = np->n_lrev; 510 } 511 } 512 } else { 513 if (np->n_flag & NMODIFIED) { 514 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) 515 == EINTR) { 516 return (error); 517 } 518 np->n_attrstamp = 0; 519 if (vp->v_type == VDIR) 520 np->n_direofoffset = 0; 521 error = VOP_GETATTR(vp, &vattr, ap->a_td); 522 if (error) 523 return (error); 524 np->n_mtime = vattr.va_mtime.tv_sec; 525 } else { 526 error = VOP_GETATTR(vp, &vattr, ap->a_td); 527 if (error) 528 return (error); 529 if (np->n_mtime != vattr.va_mtime.tv_sec) { 530 if (vp->v_type == VDIR) 531 np->n_direofoffset = 0; 532 if ((error = nfs_vinvalbuf(vp, V_SAVE, 533 ap->a_td, 1)) == EINTR) { 534 return (error); 535 } 536 np->n_mtime = vattr.va_mtime.tv_sec; 537 } 538 } 539 } 540 if ((nmp->nm_flag & NFSMNT_NQNFS) == 0) 541 np->n_attrstamp = 0; /* For Open/Close consistency */ 542 return (0); 543 } 544 545 /* 546 * nfs close vnode op 547 * What an NFS client should do upon close after writing is a debatable issue. 548 * Most NFS clients push delayed writes to the server upon close, basically for 549 * two reasons: 550 * 1 - So that any write errors may be reported back to the client process 551 * doing the close system call. By far the two most likely errors are 552 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 553 * 2 - To put a worst case upper bound on cache inconsistency between 554 * multiple clients for the file. 555 * There is also a consistency problem for Version 2 of the protocol w.r.t. 556 * not being able to tell if other clients are writing a file concurrently, 557 * since there is no way of knowing if the changed modify time in the reply 558 * is only due to the write for this client. 559 * (NFS Version 3 provides weak cache consistency data in the reply that 560 * should be sufficient to detect and handle this case.) 561 * 562 * The current code does the following: 563 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 564 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 565 * or commit them (this satisfies 1 and 2 except for the 566 * case where the server crashes after this close but 567 * before the commit RPC, which is felt to be "good 568 * enough". Changing the last argument to nfs_flush() to 569 * a 1 would force a commit operation, if it is felt a 570 * commit is necessary now. 571 * for NQNFS - do nothing now, since 2 is dealt with via leases and 572 * 1 should be dealt with via an fsync() system call for 573 * cases where write errors are important. 574 */ 575 /* ARGSUSED */ 576 static int 577 nfs_close(ap) 578 struct vop_close_args /* { 579 struct vnodeop_desc *a_desc; 580 struct vnode *a_vp; 581 int a_fflag; 582 struct ucred *a_cred; 583 struct thread *a_td; 584 } */ *ap; 585 { 586 struct vnode *vp = ap->a_vp; 587 struct nfsnode *np = VTONFS(vp); 588 int error = 0; 589 590 if (vp->v_type == VREG) { 591 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 && 592 (np->n_flag & NMODIFIED)) { 593 if (NFS_ISV3(vp)) { 594 /* 595 * Under NFSv3 we have dirty buffers to dispose of. We 596 * must flush them to the NFS server. We have the option 597 * of waiting all the way through the commit rpc or just 598 * waiting for the initial write. The default is to only 599 * wait through the initial write so the data is in the 600 * server's cache, which is roughly similar to the state 601 * a standard disk subsystem leaves the file in on close(). 602 * 603 * We cannot clear the NMODIFIED bit in np->n_flag due to 604 * potential races with other processes, and certainly 605 * cannot clear it if we don't commit. 606 */ 607 int cm = nfsv3_commit_on_close ? 1 : 0; 608 error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); 609 /* np->n_flag &= ~NMODIFIED; */ 610 } else { 611 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 612 } 613 np->n_attrstamp = 0; 614 } 615 if (np->n_flag & NWRITEERR) { 616 np->n_flag &= ~NWRITEERR; 617 error = np->n_error; 618 } 619 } 620 return (error); 621 } 622 623 /* 624 * nfs getattr call from vfs. 625 */ 626 static int 627 nfs_getattr(ap) 628 struct vop_getattr_args /* { 629 struct vnode *a_vp; 630 struct vattr *a_vap; 631 struct ucred *a_cred; 632 struct thread *a_td; 633 } */ *ap; 634 { 635 struct vnode *vp = ap->a_vp; 636 struct nfsnode *np = VTONFS(vp); 637 caddr_t cp; 638 u_int32_t *tl; 639 int32_t t1, t2; 640 caddr_t bpos, dpos; 641 int error = 0; 642 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 643 int v3 = NFS_ISV3(vp); 644 645 /* 646 * Update local times for special files. 647 */ 648 if (np->n_flag & (NACC | NUPD)) 649 np->n_flag |= NCHG; 650 /* 651 * First look in the cache. 652 */ 653 if (nfs_getattrcache(vp, ap->a_vap) == 0) 654 return (0); 655 656 if (v3 && nfsaccess_cache_timeout > 0) { 657 nfsstats.accesscache_misses++; 658 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, nfs_vpcred(vp, ND_CHECK)); 659 if (nfs_getattrcache(vp, ap->a_vap) == 0) 660 return (0); 661 } 662 663 nfsstats.rpccnt[NFSPROC_GETATTR]++; 664 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 665 nfsm_fhtom(vp, v3); 666 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, nfs_vpcred(vp, ND_CHECK)); 667 if (!error) { 668 nfsm_loadattr(vp, ap->a_vap); 669 } 670 nfsm_reqdone; 671 return (error); 672 } 673 674 /* 675 * nfs setattr call. 676 */ 677 static int 678 nfs_setattr(ap) 679 struct vop_setattr_args /* { 680 struct vnodeop_desc *a_desc; 681 struct vnode *a_vp; 682 struct vattr *a_vap; 683 struct ucred *a_cred; 684 struct thread *a_td; 685 } */ *ap; 686 { 687 struct vnode *vp = ap->a_vp; 688 struct nfsnode *np = VTONFS(vp); 689 struct vattr *vap = ap->a_vap; 690 int error = 0; 691 u_quad_t tsize; 692 693 #ifndef nolint 694 tsize = (u_quad_t)0; 695 #endif 696 697 /* 698 * Setting of flags is not supported. 699 */ 700 if (vap->va_flags != VNOVAL) 701 return (EOPNOTSUPP); 702 703 /* 704 * Disallow write attempts if the filesystem is mounted read-only. 705 */ 706 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 707 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 708 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 709 (vp->v_mount->mnt_flag & MNT_RDONLY)) 710 return (EROFS); 711 if (vap->va_size != VNOVAL) { 712 switch (vp->v_type) { 713 case VDIR: 714 return (EISDIR); 715 case VCHR: 716 case VBLK: 717 case VSOCK: 718 case VFIFO: 719 if (vap->va_mtime.tv_sec == VNOVAL && 720 vap->va_atime.tv_sec == VNOVAL && 721 vap->va_mode == (mode_t)VNOVAL && 722 vap->va_uid == (uid_t)VNOVAL && 723 vap->va_gid == (gid_t)VNOVAL) 724 return (0); 725 vap->va_size = VNOVAL; 726 break; 727 default: 728 /* 729 * Disallow write attempts if the filesystem is 730 * mounted read-only. 731 */ 732 if (vp->v_mount->mnt_flag & MNT_RDONLY) 733 return (EROFS); 734 735 /* 736 * We run vnode_pager_setsize() early (why?), 737 * we must set np->n_size now to avoid vinvalbuf 738 * V_SAVE races that might setsize a lower 739 * value. 740 */ 741 742 tsize = np->n_size; 743 error = nfs_meta_setsize(vp, ap->a_td, vap->va_size); 744 745 if (np->n_flag & NMODIFIED) { 746 if (vap->va_size == 0) 747 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); 748 else 749 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 750 if (error) { 751 np->n_size = tsize; 752 vnode_pager_setsize(vp, np->n_size); 753 return (error); 754 } 755 } 756 /* np->n_size has already been set to vap->va_size 757 * in nfs_meta_setsize(). We must set it again since 758 * nfs_loadattrcache() could be called through 759 * nfs_meta_setsize() and could modify np->n_size. 760 */ 761 np->n_vattr.va_size = np->n_size = vap->va_size; 762 }; 763 } else if ((vap->va_mtime.tv_sec != VNOVAL || 764 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 765 vp->v_type == VREG && 766 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) 767 return (error); 768 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 769 if (error && vap->va_size != VNOVAL) { 770 np->n_size = np->n_vattr.va_size = tsize; 771 vnode_pager_setsize(vp, np->n_size); 772 } 773 return (error); 774 } 775 776 /* 777 * Do an nfs setattr rpc. 778 */ 779 static int 780 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 781 struct ucred *cred, struct thread *td) 782 { 783 struct nfsv2_sattr *sp; 784 caddr_t cp; 785 int32_t t1, t2; 786 caddr_t bpos, dpos, cp2; 787 u_int32_t *tl; 788 int error = 0, wccflag = NFSV3_WCCRATTR; 789 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 790 int v3 = NFS_ISV3(vp); 791 792 nfsstats.rpccnt[NFSPROC_SETATTR]++; 793 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 794 nfsm_fhtom(vp, v3); 795 if (v3) { 796 nfsm_v3attrbuild(vap, TRUE); 797 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 798 *tl = nfs_false; 799 } else { 800 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 801 if (vap->va_mode == (mode_t)VNOVAL) 802 sp->sa_mode = nfs_xdrneg1; 803 else 804 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 805 if (vap->va_uid == (uid_t)VNOVAL) 806 sp->sa_uid = nfs_xdrneg1; 807 else 808 sp->sa_uid = txdr_unsigned(vap->va_uid); 809 if (vap->va_gid == (gid_t)VNOVAL) 810 sp->sa_gid = nfs_xdrneg1; 811 else 812 sp->sa_gid = txdr_unsigned(vap->va_gid); 813 sp->sa_size = txdr_unsigned(vap->va_size); 814 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 815 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 816 } 817 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 818 if (v3) { 819 nfsm_wcc_data(vp, wccflag); 820 } else 821 nfsm_loadattr(vp, (struct vattr *)0); 822 nfsm_reqdone; 823 return (error); 824 } 825 826 /* 827 * nfs lookup call, one step at a time... 828 * First look in cache 829 * If not found, unlock the directory nfsnode and do the rpc 830 */ 831 static int 832 nfs_lookup(ap) 833 struct vop_lookup_args /* { 834 struct vnodeop_desc *a_desc; 835 struct vnode *a_dvp; 836 struct vnode **a_vpp; 837 struct componentname *a_cnp; 838 } */ *ap; 839 { 840 struct componentname *cnp = ap->a_cnp; 841 struct vnode *dvp = ap->a_dvp; 842 struct vnode **vpp = ap->a_vpp; 843 int flags = cnp->cn_flags; 844 struct vnode *newvp; 845 u_int32_t *tl; 846 caddr_t cp; 847 int32_t t1, t2; 848 struct nfsmount *nmp; 849 caddr_t bpos, dpos, cp2; 850 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 851 long len; 852 nfsfh_t *fhp; 853 struct nfsnode *np; 854 int lockparent, wantparent, error = 0, attrflag, fhsize; 855 int v3 = NFS_ISV3(dvp); 856 struct thread *td = cnp->cn_td; 857 858 *vpp = NULLVP; 859 if ((flags & CNP_ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 860 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 861 return (EROFS); 862 if (dvp->v_type != VDIR) 863 return (ENOTDIR); 864 lockparent = flags & CNP_LOCKPARENT; 865 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 866 nmp = VFSTONFS(dvp->v_mount); 867 np = VTONFS(dvp); 868 if ((error = cache_lookup(dvp, NCPNULL, vpp, NCPPNULL, cnp)) && error != ENOENT) { 869 struct vattr vattr; 870 int vpid; 871 872 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 873 *vpp = NULLVP; 874 return (error); 875 } 876 877 newvp = *vpp; 878 vpid = newvp->v_id; 879 /* 880 * See the comment starting `Step through' in ufs/ufs_lookup.c 881 * for an explanation of the locking protocol 882 */ 883 if (dvp == newvp) { 884 VREF(newvp); 885 error = 0; 886 } else if (flags & CNP_ISDOTDOT) { 887 VOP_UNLOCK(dvp, 0, td); 888 error = vget(newvp, LK_EXCLUSIVE, td); 889 if (!error && lockparent && (flags & CNP_ISLASTCN)) 890 error = vn_lock(dvp, LK_EXCLUSIVE, td); 891 } else { 892 error = vget(newvp, LK_EXCLUSIVE, td); 893 if (!lockparent || error || !(flags & CNP_ISLASTCN)) 894 VOP_UNLOCK(dvp, 0, td); 895 } 896 if (!error) { 897 if (vpid == newvp->v_id) { 898 if (!VOP_GETATTR(newvp, &vattr, td) 899 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 900 nfsstats.lookupcache_hits++; 901 if (cnp->cn_nameiop != NAMEI_LOOKUP && 902 (flags & CNP_ISLASTCN)) 903 cnp->cn_flags |= CNP_SAVENAME; 904 return (0); 905 } 906 cache_purge(newvp); 907 } 908 vput(newvp); 909 if (lockparent && dvp != newvp && (flags & CNP_ISLASTCN)) 910 VOP_UNLOCK(dvp, 0, td); 911 } 912 error = vn_lock(dvp, LK_EXCLUSIVE, td); 913 *vpp = NULLVP; 914 if (error) 915 return (error); 916 } 917 error = 0; 918 newvp = NULLVP; 919 nfsstats.lookupcache_misses++; 920 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 921 len = cnp->cn_namelen; 922 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 923 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 924 nfsm_fhtom(dvp, v3); 925 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 926 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 927 if (error) { 928 nfsm_postop_attr(dvp, attrflag); 929 m_freem(mrep); 930 goto nfsmout; 931 } 932 nfsm_getfh(fhp, fhsize, v3); 933 934 /* 935 * Handle RENAME case... 936 */ 937 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent && (flags & CNP_ISLASTCN)) { 938 if (NFS_CMPFH(np, fhp, fhsize)) { 939 m_freem(mrep); 940 return (EISDIR); 941 } 942 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 943 if (error) { 944 m_freem(mrep); 945 return (error); 946 } 947 newvp = NFSTOV(np); 948 if (v3) { 949 nfsm_postop_attr(newvp, attrflag); 950 nfsm_postop_attr(dvp, attrflag); 951 } else 952 nfsm_loadattr(newvp, (struct vattr *)0); 953 *vpp = newvp; 954 m_freem(mrep); 955 cnp->cn_flags |= CNP_SAVENAME; 956 if (!lockparent) 957 VOP_UNLOCK(dvp, 0, td); 958 return (0); 959 } 960 961 if (flags & CNP_ISDOTDOT) { 962 VOP_UNLOCK(dvp, 0, td); 963 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 964 if (error) { 965 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 966 return (error); 967 } 968 newvp = NFSTOV(np); 969 if (lockparent && (flags & CNP_ISLASTCN) && 970 (error = vn_lock(dvp, LK_EXCLUSIVE, td))) { 971 vput(newvp); 972 return (error); 973 } 974 } else if (NFS_CMPFH(np, fhp, fhsize)) { 975 VREF(dvp); 976 newvp = dvp; 977 } else { 978 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 979 if (error) { 980 m_freem(mrep); 981 return (error); 982 } 983 if (!lockparent || !(flags & CNP_ISLASTCN)) 984 VOP_UNLOCK(dvp, 0, td); 985 newvp = NFSTOV(np); 986 } 987 if (v3) { 988 nfsm_postop_attr(newvp, attrflag); 989 nfsm_postop_attr(dvp, attrflag); 990 } else 991 nfsm_loadattr(newvp, (struct vattr *)0); 992 if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) 993 cnp->cn_flags |= CNP_SAVENAME; 994 if ((cnp->cn_flags & CNP_MAKEENTRY) && 995 (cnp->cn_nameiop != NAMEI_DELETE || !(flags & CNP_ISLASTCN))) { 996 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 997 cache_enter(dvp, NCPNULL, newvp, cnp); 998 } 999 *vpp = newvp; 1000 nfsm_reqdone; 1001 if (error) { 1002 if (newvp != NULLVP) { 1003 vrele(newvp); 1004 *vpp = NULLVP; 1005 } 1006 if ((cnp->cn_nameiop == NAMEI_CREATE || cnp->cn_nameiop == NAMEI_RENAME) && 1007 (flags & CNP_ISLASTCN) && error == ENOENT) { 1008 if (!lockparent) 1009 VOP_UNLOCK(dvp, 0, td); 1010 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 1011 error = EROFS; 1012 else 1013 error = EJUSTRETURN; 1014 } 1015 if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) 1016 cnp->cn_flags |= CNP_SAVENAME; 1017 } 1018 return (error); 1019 } 1020 1021 /* 1022 * nfs read call. 1023 * Just call nfs_bioread() to do the work. 1024 */ 1025 static int 1026 nfs_read(ap) 1027 struct vop_read_args /* { 1028 struct vnode *a_vp; 1029 struct uio *a_uio; 1030 int a_ioflag; 1031 struct ucred *a_cred; 1032 } */ *ap; 1033 { 1034 struct vnode *vp = ap->a_vp; 1035 1036 if (vp->v_type != VREG) 1037 return (EPERM); 1038 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1039 } 1040 1041 /* 1042 * nfs readlink call 1043 */ 1044 static int 1045 nfs_readlink(ap) 1046 struct vop_readlink_args /* { 1047 struct vnode *a_vp; 1048 struct uio *a_uio; 1049 struct ucred *a_cred; 1050 } */ *ap; 1051 { 1052 struct vnode *vp = ap->a_vp; 1053 1054 if (vp->v_type != VLNK) 1055 return (EINVAL); 1056 return (nfs_bioread(vp, ap->a_uio, 0)); 1057 } 1058 1059 /* 1060 * Do a readlink rpc. 1061 * Called by nfs_doio() from below the buffer cache. 1062 */ 1063 int 1064 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1065 { 1066 u_int32_t *tl; 1067 caddr_t cp; 1068 int32_t t1, t2; 1069 caddr_t bpos, dpos, cp2; 1070 int error = 0, len, attrflag; 1071 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1072 int v3 = NFS_ISV3(vp); 1073 1074 nfsstats.rpccnt[NFSPROC_READLINK]++; 1075 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1076 nfsm_fhtom(vp, v3); 1077 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, nfs_vpcred(vp, ND_CHECK)); 1078 if (v3) 1079 nfsm_postop_attr(vp, attrflag); 1080 if (!error) { 1081 nfsm_strsiz(len, NFS_MAXPATHLEN); 1082 if (len == NFS_MAXPATHLEN) { 1083 struct nfsnode *np = VTONFS(vp); 1084 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1085 len = np->n_size; 1086 } 1087 nfsm_mtouio(uiop, len); 1088 } 1089 nfsm_reqdone; 1090 return (error); 1091 } 1092 1093 /* 1094 * nfs read rpc call 1095 * Ditto above 1096 */ 1097 int 1098 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1099 { 1100 u_int32_t *tl; 1101 caddr_t cp; 1102 int32_t t1, t2; 1103 caddr_t bpos, dpos, cp2; 1104 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1105 struct nfsmount *nmp; 1106 int error = 0, len, retlen, tsiz, eof, attrflag; 1107 int v3 = NFS_ISV3(vp); 1108 1109 #ifndef nolint 1110 eof = 0; 1111 #endif 1112 nmp = VFSTONFS(vp->v_mount); 1113 tsiz = uiop->uio_resid; 1114 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1115 return (EFBIG); 1116 while (tsiz > 0) { 1117 nfsstats.rpccnt[NFSPROC_READ]++; 1118 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1119 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1120 nfsm_fhtom(vp, v3); 1121 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1122 if (v3) { 1123 txdr_hyper(uiop->uio_offset, tl); 1124 *(tl + 2) = txdr_unsigned(len); 1125 } else { 1126 *tl++ = txdr_unsigned(uiop->uio_offset); 1127 *tl++ = txdr_unsigned(len); 1128 *tl = 0; 1129 } 1130 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 1131 if (v3) { 1132 nfsm_postop_attr(vp, attrflag); 1133 if (error) { 1134 m_freem(mrep); 1135 goto nfsmout; 1136 } 1137 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1138 eof = fxdr_unsigned(int, *(tl + 1)); 1139 } else 1140 nfsm_loadattr(vp, (struct vattr *)0); 1141 nfsm_strsiz(retlen, nmp->nm_rsize); 1142 nfsm_mtouio(uiop, retlen); 1143 m_freem(mrep); 1144 tsiz -= retlen; 1145 if (v3) { 1146 if (eof || retlen == 0) { 1147 tsiz = 0; 1148 } 1149 } else if (retlen < len) { 1150 tsiz = 0; 1151 } 1152 } 1153 nfsmout: 1154 return (error); 1155 } 1156 1157 /* 1158 * nfs write call 1159 */ 1160 int 1161 nfs_writerpc(vp, uiop, iomode, must_commit) 1162 struct vnode *vp; 1163 struct uio *uiop; 1164 int *iomode, *must_commit; 1165 { 1166 u_int32_t *tl; 1167 caddr_t cp; 1168 int32_t t1, t2, backup; 1169 caddr_t bpos, dpos, cp2; 1170 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1171 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1172 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1173 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1174 1175 #ifndef DIAGNOSTIC 1176 if (uiop->uio_iovcnt != 1) 1177 panic("nfs: writerpc iovcnt > 1"); 1178 #endif 1179 *must_commit = 0; 1180 tsiz = uiop->uio_resid; 1181 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1182 return (EFBIG); 1183 while (tsiz > 0) { 1184 nfsstats.rpccnt[NFSPROC_WRITE]++; 1185 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1186 nfsm_reqhead(vp, NFSPROC_WRITE, 1187 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1188 nfsm_fhtom(vp, v3); 1189 if (v3) { 1190 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1191 txdr_hyper(uiop->uio_offset, tl); 1192 tl += 2; 1193 *tl++ = txdr_unsigned(len); 1194 *tl++ = txdr_unsigned(*iomode); 1195 *tl = txdr_unsigned(len); 1196 } else { 1197 u_int32_t x; 1198 1199 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1200 /* Set both "begin" and "current" to non-garbage. */ 1201 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1202 *tl++ = x; /* "begin offset" */ 1203 *tl++ = x; /* "current offset" */ 1204 x = txdr_unsigned(len); 1205 *tl++ = x; /* total to this offset */ 1206 *tl = x; /* size of this write */ 1207 } 1208 nfsm_uiotom(uiop, len); 1209 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, nfs_vpcred(vp, ND_WRITE)); 1210 if (v3) { 1211 wccflag = NFSV3_WCCCHK; 1212 nfsm_wcc_data(vp, wccflag); 1213 if (!error) { 1214 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1215 + NFSX_V3WRITEVERF); 1216 rlen = fxdr_unsigned(int, *tl++); 1217 if (rlen == 0) { 1218 error = NFSERR_IO; 1219 m_freem(mrep); 1220 break; 1221 } else if (rlen < len) { 1222 backup = len - rlen; 1223 uiop->uio_iov->iov_base -= backup; 1224 uiop->uio_iov->iov_len += backup; 1225 uiop->uio_offset -= backup; 1226 uiop->uio_resid += backup; 1227 len = rlen; 1228 } 1229 commit = fxdr_unsigned(int, *tl++); 1230 1231 /* 1232 * Return the lowest committment level 1233 * obtained by any of the RPCs. 1234 */ 1235 if (committed == NFSV3WRITE_FILESYNC) 1236 committed = commit; 1237 else if (committed == NFSV3WRITE_DATASYNC && 1238 commit == NFSV3WRITE_UNSTABLE) 1239 committed = commit; 1240 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1241 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1242 NFSX_V3WRITEVERF); 1243 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1244 } else if (bcmp((caddr_t)tl, 1245 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1246 *must_commit = 1; 1247 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1248 NFSX_V3WRITEVERF); 1249 } 1250 } 1251 } else 1252 nfsm_loadattr(vp, (struct vattr *)0); 1253 if (wccflag) 1254 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1255 m_freem(mrep); 1256 if (error) 1257 break; 1258 tsiz -= len; 1259 } 1260 nfsmout: 1261 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1262 committed = NFSV3WRITE_FILESYNC; 1263 *iomode = committed; 1264 if (error) 1265 uiop->uio_resid = tsiz; 1266 return (error); 1267 } 1268 1269 /* 1270 * nfs mknod rpc 1271 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1272 * mode set to specify the file type and the size field for rdev. 1273 */ 1274 static int 1275 nfs_mknodrpc(dvp, vpp, cnp, vap) 1276 struct vnode *dvp; 1277 struct vnode **vpp; 1278 struct componentname *cnp; 1279 struct vattr *vap; 1280 { 1281 struct nfsv2_sattr *sp; 1282 u_int32_t *tl; 1283 caddr_t cp; 1284 int32_t t1, t2; 1285 struct vnode *newvp = (struct vnode *)0; 1286 struct nfsnode *np = (struct nfsnode *)0; 1287 struct vattr vattr; 1288 char *cp2; 1289 caddr_t bpos, dpos; 1290 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1291 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1292 u_int32_t rdev; 1293 int v3 = NFS_ISV3(dvp); 1294 1295 if (vap->va_type == VCHR || vap->va_type == VBLK) 1296 rdev = txdr_unsigned(vap->va_rdev); 1297 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1298 rdev = nfs_xdrneg1; 1299 else { 1300 return (EOPNOTSUPP); 1301 } 1302 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1303 return (error); 1304 } 1305 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1306 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1307 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1308 nfsm_fhtom(dvp, v3); 1309 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1310 if (v3) { 1311 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1312 *tl++ = vtonfsv3_type(vap->va_type); 1313 nfsm_v3attrbuild(vap, FALSE); 1314 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1315 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1316 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1317 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1318 } 1319 } else { 1320 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1321 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1322 sp->sa_uid = nfs_xdrneg1; 1323 sp->sa_gid = nfs_xdrneg1; 1324 sp->sa_size = rdev; 1325 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1326 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1327 } 1328 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1329 if (!error) { 1330 nfsm_mtofh(dvp, newvp, v3, gotvp); 1331 if (!gotvp) { 1332 if (newvp) { 1333 vput(newvp); 1334 newvp = (struct vnode *)0; 1335 } 1336 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1337 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1338 if (!error) 1339 newvp = NFSTOV(np); 1340 } 1341 } 1342 if (v3) 1343 nfsm_wcc_data(dvp, wccflag); 1344 nfsm_reqdone; 1345 if (error) { 1346 if (newvp) 1347 vput(newvp); 1348 } else { 1349 if (cnp->cn_flags & CNP_MAKEENTRY) 1350 cache_enter(dvp, NCPNULL, newvp, cnp); 1351 *vpp = newvp; 1352 } 1353 VTONFS(dvp)->n_flag |= NMODIFIED; 1354 if (!wccflag) 1355 VTONFS(dvp)->n_attrstamp = 0; 1356 return (error); 1357 } 1358 1359 /* 1360 * nfs mknod vop 1361 * just call nfs_mknodrpc() to do the work. 1362 */ 1363 /* ARGSUSED */ 1364 static int 1365 nfs_mknod(ap) 1366 struct vop_mknod_args /* { 1367 struct vnode *a_dvp; 1368 struct vnode **a_vpp; 1369 struct componentname *a_cnp; 1370 struct vattr *a_vap; 1371 } */ *ap; 1372 { 1373 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1374 } 1375 1376 static u_long create_verf; 1377 /* 1378 * nfs file create call 1379 */ 1380 static int 1381 nfs_create(ap) 1382 struct vop_create_args /* { 1383 struct vnode *a_dvp; 1384 struct vnode **a_vpp; 1385 struct componentname *a_cnp; 1386 struct vattr *a_vap; 1387 } */ *ap; 1388 { 1389 struct vnode *dvp = ap->a_dvp; 1390 struct vattr *vap = ap->a_vap; 1391 struct componentname *cnp = ap->a_cnp; 1392 struct nfsv2_sattr *sp; 1393 u_int32_t *tl; 1394 caddr_t cp; 1395 int32_t t1, t2; 1396 struct nfsnode *np = (struct nfsnode *)0; 1397 struct vnode *newvp = (struct vnode *)0; 1398 caddr_t bpos, dpos, cp2; 1399 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1400 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1401 struct vattr vattr; 1402 int v3 = NFS_ISV3(dvp); 1403 1404 /* 1405 * Oops, not for me.. 1406 */ 1407 if (vap->va_type == VSOCK) 1408 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1409 1410 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1411 return (error); 1412 } 1413 if (vap->va_vaflags & VA_EXCLUSIVE) 1414 fmode |= O_EXCL; 1415 again: 1416 nfsstats.rpccnt[NFSPROC_CREATE]++; 1417 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1418 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1419 nfsm_fhtom(dvp, v3); 1420 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1421 if (v3) { 1422 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1423 if (fmode & O_EXCL) { 1424 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1425 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1426 #ifdef INET 1427 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1428 *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr; 1429 else 1430 #endif 1431 *tl++ = create_verf; 1432 *tl = ++create_verf; 1433 } else { 1434 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1435 nfsm_v3attrbuild(vap, FALSE); 1436 } 1437 } else { 1438 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1439 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1440 sp->sa_uid = nfs_xdrneg1; 1441 sp->sa_gid = nfs_xdrneg1; 1442 sp->sa_size = 0; 1443 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1444 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1445 } 1446 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1447 if (!error) { 1448 nfsm_mtofh(dvp, newvp, v3, gotvp); 1449 if (!gotvp) { 1450 if (newvp) { 1451 vput(newvp); 1452 newvp = (struct vnode *)0; 1453 } 1454 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1455 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1456 if (!error) 1457 newvp = NFSTOV(np); 1458 } 1459 } 1460 if (v3) 1461 nfsm_wcc_data(dvp, wccflag); 1462 nfsm_reqdone; 1463 if (error) { 1464 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1465 fmode &= ~O_EXCL; 1466 goto again; 1467 } 1468 if (newvp) 1469 vput(newvp); 1470 } else if (v3 && (fmode & O_EXCL)) { 1471 /* 1472 * We are normally called with only a partially initialized 1473 * VAP. Since the NFSv3 spec says that server may use the 1474 * file attributes to store the verifier, the spec requires 1475 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1476 * in atime, but we can't really assume that all servers will 1477 * so we ensure that our SETATTR sets both atime and mtime. 1478 */ 1479 if (vap->va_mtime.tv_sec == VNOVAL) 1480 vfs_timestamp(&vap->va_mtime); 1481 if (vap->va_atime.tv_sec == VNOVAL) 1482 vap->va_atime = vap->va_mtime; 1483 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1484 } 1485 if (!error) { 1486 if (cnp->cn_flags & CNP_MAKEENTRY) 1487 cache_enter(dvp, NCPNULL, newvp, cnp); 1488 /* 1489 * The new np may have enough info for access 1490 * checks, make sure rucred and wucred are 1491 * initialized for read and write rpc's. 1492 */ 1493 np = VTONFS(newvp); 1494 if (np->n_rucred == NULL) 1495 np->n_rucred = crhold(cnp->cn_cred); 1496 if (np->n_wucred == NULL) 1497 np->n_wucred = crhold(cnp->cn_cred); 1498 *ap->a_vpp = newvp; 1499 } 1500 VTONFS(dvp)->n_flag |= NMODIFIED; 1501 if (!wccflag) 1502 VTONFS(dvp)->n_attrstamp = 0; 1503 return (error); 1504 } 1505 1506 /* 1507 * nfs file remove call 1508 * To try and make nfs semantics closer to ufs semantics, a file that has 1509 * other processes using the vnode is renamed instead of removed and then 1510 * removed later on the last close. 1511 * - If v_usecount > 1 1512 * If a rename is not already in the works 1513 * call nfs_sillyrename() to set it up 1514 * else 1515 * do the remove rpc 1516 */ 1517 static int 1518 nfs_remove(ap) 1519 struct vop_remove_args /* { 1520 struct vnodeop_desc *a_desc; 1521 struct vnode * a_dvp; 1522 struct vnode * a_vp; 1523 struct componentname * a_cnp; 1524 } */ *ap; 1525 { 1526 struct vnode *vp = ap->a_vp; 1527 struct vnode *dvp = ap->a_dvp; 1528 struct componentname *cnp = ap->a_cnp; 1529 struct nfsnode *np = VTONFS(vp); 1530 int error = 0; 1531 struct vattr vattr; 1532 1533 #ifndef DIAGNOSTIC 1534 if ((cnp->cn_flags & CNP_HASBUF) == 0) 1535 panic("nfs_remove: no name"); 1536 if (vp->v_usecount < 1) 1537 panic("nfs_remove: bad v_usecount"); 1538 #endif 1539 if (vp->v_type == VDIR) 1540 error = EPERM; 1541 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1542 VOP_GETATTR(vp, &vattr, cnp->cn_td) == 0 && 1543 vattr.va_nlink > 1)) { 1544 /* 1545 * Purge the name cache so that the chance of a lookup for 1546 * the name succeeding while the remove is in progress is 1547 * minimized. Without node locking it can still happen, such 1548 * that an I/O op returns ESTALE, but since you get this if 1549 * another host removes the file.. 1550 */ 1551 cache_purge(vp); 1552 /* 1553 * throw away biocache buffers, mainly to avoid 1554 * unnecessary delayed writes later. 1555 */ 1556 error = nfs_vinvalbuf(vp, 0, cnp->cn_td, 1); 1557 /* Do the rpc */ 1558 if (error != EINTR) 1559 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1560 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1561 /* 1562 * Kludge City: If the first reply to the remove rpc is lost.. 1563 * the reply to the retransmitted request will be ENOENT 1564 * since the file was in fact removed 1565 * Therefore, we cheat and return success. 1566 */ 1567 if (error == ENOENT) 1568 error = 0; 1569 } else if (!np->n_sillyrename) 1570 error = nfs_sillyrename(dvp, vp, cnp); 1571 np->n_attrstamp = 0; 1572 return (error); 1573 } 1574 1575 /* 1576 * nfs file remove rpc called from nfs_inactive 1577 */ 1578 int 1579 nfs_removeit(struct sillyrename *sp) 1580 { 1581 1582 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1583 sp->s_cred, NULL)); 1584 } 1585 1586 /* 1587 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1588 */ 1589 static int 1590 nfs_removerpc(dvp, name, namelen, cred, td) 1591 struct vnode *dvp; 1592 const char *name; 1593 int namelen; 1594 struct ucred *cred; 1595 struct thread *td; 1596 { 1597 u_int32_t *tl; 1598 caddr_t cp; 1599 int32_t t1, t2; 1600 caddr_t bpos, dpos, cp2; 1601 int error = 0, wccflag = NFSV3_WCCRATTR; 1602 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1603 int v3 = NFS_ISV3(dvp); 1604 1605 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1606 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1607 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1608 nfsm_fhtom(dvp, v3); 1609 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1610 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1611 if (v3) 1612 nfsm_wcc_data(dvp, wccflag); 1613 nfsm_reqdone; 1614 VTONFS(dvp)->n_flag |= NMODIFIED; 1615 if (!wccflag) 1616 VTONFS(dvp)->n_attrstamp = 0; 1617 return (error); 1618 } 1619 1620 /* 1621 * nfs file rename call 1622 */ 1623 static int 1624 nfs_rename(ap) 1625 struct vop_rename_args /* { 1626 struct vnode *a_fdvp; 1627 struct vnode *a_fvp; 1628 struct componentname *a_fcnp; 1629 struct vnode *a_tdvp; 1630 struct vnode *a_tvp; 1631 struct componentname *a_tcnp; 1632 } */ *ap; 1633 { 1634 struct vnode *fvp = ap->a_fvp; 1635 struct vnode *tvp = ap->a_tvp; 1636 struct vnode *fdvp = ap->a_fdvp; 1637 struct vnode *tdvp = ap->a_tdvp; 1638 struct componentname *tcnp = ap->a_tcnp; 1639 struct componentname *fcnp = ap->a_fcnp; 1640 int error; 1641 1642 #ifndef DIAGNOSTIC 1643 if ((tcnp->cn_flags & CNP_HASBUF) == 0 || 1644 (fcnp->cn_flags & CNP_HASBUF) == 0) 1645 panic("nfs_rename: no name"); 1646 #endif 1647 /* Check for cross-device rename */ 1648 if ((fvp->v_mount != tdvp->v_mount) || 1649 (tvp && (fvp->v_mount != tvp->v_mount))) { 1650 error = EXDEV; 1651 goto out; 1652 } 1653 1654 /* 1655 * We have to flush B_DELWRI data prior to renaming 1656 * the file. If we don't, the delayed-write buffers 1657 * can be flushed out later after the file has gone stale 1658 * under NFSV3. NFSV2 does not have this problem because 1659 * ( as far as I can tell ) it flushes dirty buffers more 1660 * often. 1661 */ 1662 1663 VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_td); 1664 if (tvp) 1665 VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_td); 1666 1667 /* 1668 * If the tvp exists and is in use, sillyrename it before doing the 1669 * rename of the new file over it. 1670 * XXX Can't sillyrename a directory. 1671 */ 1672 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1673 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1674 vput(tvp); 1675 tvp = NULL; 1676 } 1677 1678 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1679 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1680 tcnp->cn_td); 1681 1682 if (fvp->v_type == VDIR) { 1683 if (tvp != NULL && tvp->v_type == VDIR) 1684 cache_purge(tdvp); 1685 cache_purge(fdvp); 1686 } 1687 1688 out: 1689 if (tdvp == tvp) 1690 vrele(tdvp); 1691 else 1692 vput(tdvp); 1693 if (tvp) 1694 vput(tvp); 1695 vrele(fdvp); 1696 vrele(fvp); 1697 /* 1698 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1699 */ 1700 if (error == ENOENT) 1701 error = 0; 1702 return (error); 1703 } 1704 1705 /* 1706 * nfs file rename rpc called from nfs_remove() above 1707 */ 1708 static int 1709 nfs_renameit(sdvp, scnp, sp) 1710 struct vnode *sdvp; 1711 struct componentname *scnp; 1712 struct sillyrename *sp; 1713 { 1714 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1715 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1716 } 1717 1718 /* 1719 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1720 */ 1721 static int 1722 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, td) 1723 struct vnode *fdvp; 1724 const char *fnameptr; 1725 int fnamelen; 1726 struct vnode *tdvp; 1727 const char *tnameptr; 1728 int tnamelen; 1729 struct ucred *cred; 1730 struct thread *td; 1731 { 1732 u_int32_t *tl; 1733 caddr_t cp; 1734 int32_t t1, t2; 1735 caddr_t bpos, dpos, cp2; 1736 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1737 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1738 int v3 = NFS_ISV3(fdvp); 1739 1740 nfsstats.rpccnt[NFSPROC_RENAME]++; 1741 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1742 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1743 nfsm_rndup(tnamelen)); 1744 nfsm_fhtom(fdvp, v3); 1745 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1746 nfsm_fhtom(tdvp, v3); 1747 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1748 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1749 if (v3) { 1750 nfsm_wcc_data(fdvp, fwccflag); 1751 nfsm_wcc_data(tdvp, twccflag); 1752 } 1753 nfsm_reqdone; 1754 VTONFS(fdvp)->n_flag |= NMODIFIED; 1755 VTONFS(tdvp)->n_flag |= NMODIFIED; 1756 if (!fwccflag) 1757 VTONFS(fdvp)->n_attrstamp = 0; 1758 if (!twccflag) 1759 VTONFS(tdvp)->n_attrstamp = 0; 1760 return (error); 1761 } 1762 1763 /* 1764 * nfs hard link create call 1765 */ 1766 static int 1767 nfs_link(ap) 1768 struct vop_link_args /* { 1769 struct vnode *a_tdvp; 1770 struct vnode *a_vp; 1771 struct componentname *a_cnp; 1772 } */ *ap; 1773 { 1774 struct vnode *vp = ap->a_vp; 1775 struct vnode *tdvp = ap->a_tdvp; 1776 struct componentname *cnp = ap->a_cnp; 1777 u_int32_t *tl; 1778 caddr_t cp; 1779 int32_t t1, t2; 1780 caddr_t bpos, dpos, cp2; 1781 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1782 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1783 int v3; 1784 1785 if (vp->v_mount != tdvp->v_mount) { 1786 return (EXDEV); 1787 } 1788 1789 /* 1790 * Push all writes to the server, so that the attribute cache 1791 * doesn't get "out of sync" with the server. 1792 * XXX There should be a better way! 1793 */ 1794 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_td); 1795 1796 v3 = NFS_ISV3(vp); 1797 nfsstats.rpccnt[NFSPROC_LINK]++; 1798 nfsm_reqhead(vp, NFSPROC_LINK, 1799 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1800 nfsm_fhtom(vp, v3); 1801 nfsm_fhtom(tdvp, v3); 1802 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1803 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1804 if (v3) { 1805 nfsm_postop_attr(vp, attrflag); 1806 nfsm_wcc_data(tdvp, wccflag); 1807 } 1808 nfsm_reqdone; 1809 VTONFS(tdvp)->n_flag |= NMODIFIED; 1810 if (!attrflag) 1811 VTONFS(vp)->n_attrstamp = 0; 1812 if (!wccflag) 1813 VTONFS(tdvp)->n_attrstamp = 0; 1814 /* 1815 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1816 */ 1817 if (error == EEXIST) 1818 error = 0; 1819 return (error); 1820 } 1821 1822 /* 1823 * nfs symbolic link create call 1824 */ 1825 static int 1826 nfs_symlink(ap) 1827 struct vop_symlink_args /* { 1828 struct vnode *a_dvp; 1829 struct vnode **a_vpp; 1830 struct componentname *a_cnp; 1831 struct vattr *a_vap; 1832 char *a_target; 1833 } */ *ap; 1834 { 1835 struct vnode *dvp = ap->a_dvp; 1836 struct vattr *vap = ap->a_vap; 1837 struct componentname *cnp = ap->a_cnp; 1838 struct nfsv2_sattr *sp; 1839 u_int32_t *tl; 1840 caddr_t cp; 1841 int32_t t1, t2; 1842 caddr_t bpos, dpos, cp2; 1843 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1844 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1845 struct vnode *newvp = (struct vnode *)0; 1846 int v3 = NFS_ISV3(dvp); 1847 1848 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1849 slen = strlen(ap->a_target); 1850 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1851 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1852 nfsm_fhtom(dvp, v3); 1853 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1854 if (v3) { 1855 nfsm_v3attrbuild(vap, FALSE); 1856 } 1857 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1858 if (!v3) { 1859 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1860 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1861 sp->sa_uid = nfs_xdrneg1; 1862 sp->sa_gid = nfs_xdrneg1; 1863 sp->sa_size = nfs_xdrneg1; 1864 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1865 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1866 } 1867 1868 /* 1869 * Issue the NFS request and get the rpc response. 1870 * 1871 * Only NFSv3 responses returning an error of 0 actually return 1872 * a file handle that can be converted into newvp without having 1873 * to do an extra lookup rpc. 1874 */ 1875 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1876 if (v3) { 1877 if (error == 0) 1878 nfsm_mtofh(dvp, newvp, v3, gotvp); 1879 nfsm_wcc_data(dvp, wccflag); 1880 } 1881 1882 /* 1883 * out code jumps -> here, mrep is also freed. 1884 */ 1885 1886 nfsm_reqdone; 1887 1888 /* 1889 * If we get an EEXIST error, silently convert it to no-error 1890 * in case of an NFS retry. 1891 */ 1892 if (error == EEXIST) 1893 error = 0; 1894 1895 /* 1896 * If we do not have (or no longer have) an error, and we could 1897 * not extract the newvp from the response due to the request being 1898 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1899 * to obtain a newvp to return. 1900 */ 1901 if (error == 0 && newvp == NULL) { 1902 struct nfsnode *np = NULL; 1903 1904 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1905 cnp->cn_cred, cnp->cn_td, &np); 1906 if (!error) 1907 newvp = NFSTOV(np); 1908 } 1909 if (error) { 1910 if (newvp) 1911 vput(newvp); 1912 } else { 1913 *ap->a_vpp = newvp; 1914 } 1915 VTONFS(dvp)->n_flag |= NMODIFIED; 1916 if (!wccflag) 1917 VTONFS(dvp)->n_attrstamp = 0; 1918 return (error); 1919 } 1920 1921 /* 1922 * nfs make dir call 1923 */ 1924 static int 1925 nfs_mkdir(ap) 1926 struct vop_mkdir_args /* { 1927 struct vnode *a_dvp; 1928 struct vnode **a_vpp; 1929 struct componentname *a_cnp; 1930 struct vattr *a_vap; 1931 } */ *ap; 1932 { 1933 struct vnode *dvp = ap->a_dvp; 1934 struct vattr *vap = ap->a_vap; 1935 struct componentname *cnp = ap->a_cnp; 1936 struct nfsv2_sattr *sp; 1937 u_int32_t *tl; 1938 caddr_t cp; 1939 int32_t t1, t2; 1940 int len; 1941 struct nfsnode *np = (struct nfsnode *)0; 1942 struct vnode *newvp = (struct vnode *)0; 1943 caddr_t bpos, dpos, cp2; 1944 int error = 0, wccflag = NFSV3_WCCRATTR; 1945 int gotvp = 0; 1946 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1947 struct vattr vattr; 1948 int v3 = NFS_ISV3(dvp); 1949 1950 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1951 return (error); 1952 } 1953 len = cnp->cn_namelen; 1954 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1955 nfsm_reqhead(dvp, NFSPROC_MKDIR, 1956 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1957 nfsm_fhtom(dvp, v3); 1958 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1959 if (v3) { 1960 nfsm_v3attrbuild(vap, FALSE); 1961 } else { 1962 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1963 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1964 sp->sa_uid = nfs_xdrneg1; 1965 sp->sa_gid = nfs_xdrneg1; 1966 sp->sa_size = nfs_xdrneg1; 1967 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1968 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1969 } 1970 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 1971 if (!error) 1972 nfsm_mtofh(dvp, newvp, v3, gotvp); 1973 if (v3) 1974 nfsm_wcc_data(dvp, wccflag); 1975 nfsm_reqdone; 1976 VTONFS(dvp)->n_flag |= NMODIFIED; 1977 if (!wccflag) 1978 VTONFS(dvp)->n_attrstamp = 0; 1979 /* 1980 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1981 * if we can succeed in looking up the directory. 1982 */ 1983 if (error == EEXIST || (!error && !gotvp)) { 1984 if (newvp) { 1985 vrele(newvp); 1986 newvp = (struct vnode *)0; 1987 } 1988 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1989 cnp->cn_td, &np); 1990 if (!error) { 1991 newvp = NFSTOV(np); 1992 if (newvp->v_type != VDIR) 1993 error = EEXIST; 1994 } 1995 } 1996 if (error) { 1997 if (newvp) 1998 vrele(newvp); 1999 } else 2000 *ap->a_vpp = newvp; 2001 return (error); 2002 } 2003 2004 /* 2005 * nfs remove directory call 2006 */ 2007 static int 2008 nfs_rmdir(ap) 2009 struct vop_rmdir_args /* { 2010 struct vnode *a_dvp; 2011 struct vnode *a_vp; 2012 struct componentname *a_cnp; 2013 } */ *ap; 2014 { 2015 struct vnode *vp = ap->a_vp; 2016 struct vnode *dvp = ap->a_dvp; 2017 struct componentname *cnp = ap->a_cnp; 2018 u_int32_t *tl; 2019 caddr_t cp; 2020 int32_t t1, t2; 2021 caddr_t bpos, dpos, cp2; 2022 int error = 0, wccflag = NFSV3_WCCRATTR; 2023 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2024 int v3 = NFS_ISV3(dvp); 2025 2026 if (dvp == vp) 2027 return (EINVAL); 2028 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2029 nfsm_reqhead(dvp, NFSPROC_RMDIR, 2030 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2031 nfsm_fhtom(dvp, v3); 2032 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2033 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2034 if (v3) 2035 nfsm_wcc_data(dvp, wccflag); 2036 nfsm_reqdone; 2037 VTONFS(dvp)->n_flag |= NMODIFIED; 2038 if (!wccflag) 2039 VTONFS(dvp)->n_attrstamp = 0; 2040 cache_purge(dvp); 2041 cache_purge(vp); 2042 /* 2043 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2044 */ 2045 if (error == ENOENT) 2046 error = 0; 2047 return (error); 2048 } 2049 2050 /* 2051 * nfs readdir call 2052 */ 2053 static int 2054 nfs_readdir(ap) 2055 struct vop_readdir_args /* { 2056 struct vnode *a_vp; 2057 struct uio *a_uio; 2058 struct ucred *a_cred; 2059 } */ *ap; 2060 { 2061 struct vnode *vp = ap->a_vp; 2062 struct nfsnode *np = VTONFS(vp); 2063 struct uio *uio = ap->a_uio; 2064 int tresid, error; 2065 struct vattr vattr; 2066 2067 if (vp->v_type != VDIR) 2068 return (EPERM); 2069 /* 2070 * First, check for hit on the EOF offset cache 2071 */ 2072 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2073 (np->n_flag & NMODIFIED) == 0) { 2074 if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) { 2075 if (NQNFS_CKCACHABLE(vp, ND_READ)) { 2076 nfsstats.direofcache_hits++; 2077 return (0); 2078 } 2079 } else if (VOP_GETATTR(vp, &vattr, uio->uio_td) == 0 && 2080 np->n_mtime == vattr.va_mtime.tv_sec) { 2081 nfsstats.direofcache_hits++; 2082 return (0); 2083 } 2084 } 2085 2086 /* 2087 * Call nfs_bioread() to do the real work. 2088 */ 2089 tresid = uio->uio_resid; 2090 error = nfs_bioread(vp, uio, 0); 2091 2092 if (!error && uio->uio_resid == tresid) 2093 nfsstats.direofcache_misses++; 2094 return (error); 2095 } 2096 2097 /* 2098 * Readdir rpc call. 2099 * Called from below the buffer cache by nfs_doio(). 2100 */ 2101 int 2102 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2103 { 2104 int len, left; 2105 struct dirent *dp = NULL; 2106 u_int32_t *tl; 2107 caddr_t cp; 2108 int32_t t1, t2; 2109 nfsuint64 *cookiep; 2110 caddr_t bpos, dpos, cp2; 2111 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2112 nfsuint64 cookie; 2113 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2114 struct nfsnode *dnp = VTONFS(vp); 2115 u_quad_t fileno; 2116 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2117 int attrflag; 2118 int v3 = NFS_ISV3(vp); 2119 2120 #ifndef DIAGNOSTIC 2121 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2122 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2123 panic("nfs readdirrpc bad uio"); 2124 #endif 2125 2126 /* 2127 * If there is no cookie, assume directory was stale. 2128 */ 2129 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2130 if (cookiep) 2131 cookie = *cookiep; 2132 else 2133 return (NFSERR_BAD_COOKIE); 2134 /* 2135 * Loop around doing readdir rpc's of size nm_readdirsize 2136 * truncated to a multiple of DIRBLKSIZ. 2137 * The stopping criteria is EOF or buffer full. 2138 */ 2139 while (more_dirs && bigenough) { 2140 nfsstats.rpccnt[NFSPROC_READDIR]++; 2141 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2142 NFSX_READDIR(v3)); 2143 nfsm_fhtom(vp, v3); 2144 if (v3) { 2145 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2146 *tl++ = cookie.nfsuquad[0]; 2147 *tl++ = cookie.nfsuquad[1]; 2148 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2149 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2150 } else { 2151 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2152 *tl++ = cookie.nfsuquad[0]; 2153 } 2154 *tl = txdr_unsigned(nmp->nm_readdirsize); 2155 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2156 if (v3) { 2157 nfsm_postop_attr(vp, attrflag); 2158 if (!error) { 2159 nfsm_dissect(tl, u_int32_t *, 2160 2 * NFSX_UNSIGNED); 2161 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2162 dnp->n_cookieverf.nfsuquad[1] = *tl; 2163 } else { 2164 m_freem(mrep); 2165 goto nfsmout; 2166 } 2167 } 2168 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2169 more_dirs = fxdr_unsigned(int, *tl); 2170 2171 /* loop thru the dir entries, doctoring them to 4bsd form */ 2172 while (more_dirs && bigenough) { 2173 if (v3) { 2174 nfsm_dissect(tl, u_int32_t *, 2175 3 * NFSX_UNSIGNED); 2176 fileno = fxdr_hyper(tl); 2177 len = fxdr_unsigned(int, *(tl + 2)); 2178 } else { 2179 nfsm_dissect(tl, u_int32_t *, 2180 2 * NFSX_UNSIGNED); 2181 fileno = fxdr_unsigned(u_quad_t, *tl++); 2182 len = fxdr_unsigned(int, *tl); 2183 } 2184 if (len <= 0 || len > NFS_MAXNAMLEN) { 2185 error = EBADRPC; 2186 m_freem(mrep); 2187 goto nfsmout; 2188 } 2189 tlen = nfsm_rndup(len); 2190 if (tlen == len) 2191 tlen += 4; /* To ensure null termination */ 2192 left = DIRBLKSIZ - blksiz; 2193 if ((tlen + DIRHDSIZ) > left) { 2194 dp->d_reclen += left; 2195 uiop->uio_iov->iov_base += left; 2196 uiop->uio_iov->iov_len -= left; 2197 uiop->uio_offset += left; 2198 uiop->uio_resid -= left; 2199 blksiz = 0; 2200 } 2201 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2202 bigenough = 0; 2203 if (bigenough) { 2204 dp = (struct dirent *)uiop->uio_iov->iov_base; 2205 dp->d_fileno = (int)fileno; 2206 dp->d_namlen = len; 2207 dp->d_reclen = tlen + DIRHDSIZ; 2208 dp->d_type = DT_UNKNOWN; 2209 blksiz += dp->d_reclen; 2210 if (blksiz == DIRBLKSIZ) 2211 blksiz = 0; 2212 uiop->uio_offset += DIRHDSIZ; 2213 uiop->uio_resid -= DIRHDSIZ; 2214 uiop->uio_iov->iov_base += DIRHDSIZ; 2215 uiop->uio_iov->iov_len -= DIRHDSIZ; 2216 nfsm_mtouio(uiop, len); 2217 cp = uiop->uio_iov->iov_base; 2218 tlen -= len; 2219 *cp = '\0'; /* null terminate */ 2220 uiop->uio_iov->iov_base += tlen; 2221 uiop->uio_iov->iov_len -= tlen; 2222 uiop->uio_offset += tlen; 2223 uiop->uio_resid -= tlen; 2224 } else 2225 nfsm_adv(nfsm_rndup(len)); 2226 if (v3) { 2227 nfsm_dissect(tl, u_int32_t *, 2228 3 * NFSX_UNSIGNED); 2229 } else { 2230 nfsm_dissect(tl, u_int32_t *, 2231 2 * NFSX_UNSIGNED); 2232 } 2233 if (bigenough) { 2234 cookie.nfsuquad[0] = *tl++; 2235 if (v3) 2236 cookie.nfsuquad[1] = *tl++; 2237 } else if (v3) 2238 tl += 2; 2239 else 2240 tl++; 2241 more_dirs = fxdr_unsigned(int, *tl); 2242 } 2243 /* 2244 * If at end of rpc data, get the eof boolean 2245 */ 2246 if (!more_dirs) { 2247 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2248 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2249 } 2250 m_freem(mrep); 2251 } 2252 /* 2253 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2254 * by increasing d_reclen for the last record. 2255 */ 2256 if (blksiz > 0) { 2257 left = DIRBLKSIZ - blksiz; 2258 dp->d_reclen += left; 2259 uiop->uio_iov->iov_base += left; 2260 uiop->uio_iov->iov_len -= left; 2261 uiop->uio_offset += left; 2262 uiop->uio_resid -= left; 2263 } 2264 2265 /* 2266 * We are now either at the end of the directory or have filled the 2267 * block. 2268 */ 2269 if (bigenough) 2270 dnp->n_direofoffset = uiop->uio_offset; 2271 else { 2272 if (uiop->uio_resid > 0) 2273 printf("EEK! readdirrpc resid > 0\n"); 2274 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2275 *cookiep = cookie; 2276 } 2277 nfsmout: 2278 return (error); 2279 } 2280 2281 /* 2282 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2283 */ 2284 int 2285 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2286 { 2287 int len, left; 2288 struct dirent *dp; 2289 u_int32_t *tl; 2290 caddr_t cp; 2291 int32_t t1, t2; 2292 struct vnode *newvp; 2293 nfsuint64 *cookiep; 2294 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2295 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2296 struct nameidata nami, *ndp = &nami; 2297 struct componentname *cnp = &ndp->ni_cnd; 2298 nfsuint64 cookie; 2299 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2300 struct nfsnode *dnp = VTONFS(vp), *np; 2301 nfsfh_t *fhp; 2302 u_quad_t fileno; 2303 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2304 int attrflag, fhsize; 2305 2306 #ifndef nolint 2307 dp = (struct dirent *)0; 2308 #endif 2309 #ifndef DIAGNOSTIC 2310 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2311 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2312 panic("nfs readdirplusrpc bad uio"); 2313 #endif 2314 ndp->ni_dvp = vp; 2315 newvp = NULLVP; 2316 2317 /* 2318 * If there is no cookie, assume directory was stale. 2319 */ 2320 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2321 if (cookiep) 2322 cookie = *cookiep; 2323 else 2324 return (NFSERR_BAD_COOKIE); 2325 /* 2326 * Loop around doing readdir rpc's of size nm_readdirsize 2327 * truncated to a multiple of DIRBLKSIZ. 2328 * The stopping criteria is EOF or buffer full. 2329 */ 2330 while (more_dirs && bigenough) { 2331 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2332 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2333 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2334 nfsm_fhtom(vp, 1); 2335 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2336 *tl++ = cookie.nfsuquad[0]; 2337 *tl++ = cookie.nfsuquad[1]; 2338 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2339 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2340 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2341 *tl = txdr_unsigned(nmp->nm_rsize); 2342 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, nfs_vpcred(vp, ND_READ)); 2343 nfsm_postop_attr(vp, attrflag); 2344 if (error) { 2345 m_freem(mrep); 2346 goto nfsmout; 2347 } 2348 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2349 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2350 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2351 more_dirs = fxdr_unsigned(int, *tl); 2352 2353 /* loop thru the dir entries, doctoring them to 4bsd form */ 2354 while (more_dirs && bigenough) { 2355 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2356 fileno = fxdr_hyper(tl); 2357 len = fxdr_unsigned(int, *(tl + 2)); 2358 if (len <= 0 || len > NFS_MAXNAMLEN) { 2359 error = EBADRPC; 2360 m_freem(mrep); 2361 goto nfsmout; 2362 } 2363 tlen = nfsm_rndup(len); 2364 if (tlen == len) 2365 tlen += 4; /* To ensure null termination*/ 2366 left = DIRBLKSIZ - blksiz; 2367 if ((tlen + DIRHDSIZ) > left) { 2368 dp->d_reclen += left; 2369 uiop->uio_iov->iov_base += left; 2370 uiop->uio_iov->iov_len -= left; 2371 uiop->uio_offset += left; 2372 uiop->uio_resid -= left; 2373 blksiz = 0; 2374 } 2375 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2376 bigenough = 0; 2377 if (bigenough) { 2378 dp = (struct dirent *)uiop->uio_iov->iov_base; 2379 dp->d_fileno = (int)fileno; 2380 dp->d_namlen = len; 2381 dp->d_reclen = tlen + DIRHDSIZ; 2382 dp->d_type = DT_UNKNOWN; 2383 blksiz += dp->d_reclen; 2384 if (blksiz == DIRBLKSIZ) 2385 blksiz = 0; 2386 uiop->uio_offset += DIRHDSIZ; 2387 uiop->uio_resid -= DIRHDSIZ; 2388 uiop->uio_iov->iov_base += DIRHDSIZ; 2389 uiop->uio_iov->iov_len -= DIRHDSIZ; 2390 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2391 cnp->cn_namelen = len; 2392 nfsm_mtouio(uiop, len); 2393 cp = uiop->uio_iov->iov_base; 2394 tlen -= len; 2395 *cp = '\0'; 2396 uiop->uio_iov->iov_base += tlen; 2397 uiop->uio_iov->iov_len -= tlen; 2398 uiop->uio_offset += tlen; 2399 uiop->uio_resid -= tlen; 2400 } else 2401 nfsm_adv(nfsm_rndup(len)); 2402 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2403 if (bigenough) { 2404 cookie.nfsuquad[0] = *tl++; 2405 cookie.nfsuquad[1] = *tl++; 2406 } else 2407 tl += 2; 2408 2409 /* 2410 * Since the attributes are before the file handle 2411 * (sigh), we must skip over the attributes and then 2412 * come back and get them. 2413 */ 2414 attrflag = fxdr_unsigned(int, *tl); 2415 if (attrflag) { 2416 dpossav1 = dpos; 2417 mdsav1 = md; 2418 nfsm_adv(NFSX_V3FATTR); 2419 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2420 doit = fxdr_unsigned(int, *tl); 2421 if (doit) { 2422 nfsm_getfh(fhp, fhsize, 1); 2423 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2424 VREF(vp); 2425 newvp = vp; 2426 np = dnp; 2427 } else { 2428 error = nfs_nget(vp->v_mount, fhp, 2429 fhsize, &np); 2430 if (error) 2431 doit = 0; 2432 else 2433 newvp = NFSTOV(np); 2434 } 2435 } 2436 if (doit && bigenough) { 2437 dpossav2 = dpos; 2438 dpos = dpossav1; 2439 mdsav2 = md; 2440 md = mdsav1; 2441 nfsm_loadattr(newvp, (struct vattr *)0); 2442 dpos = dpossav2; 2443 md = mdsav2; 2444 dp->d_type = 2445 IFTODT(VTTOIF(np->n_vattr.va_type)); 2446 ndp->ni_vp = newvp; 2447 cache_enter(ndp->ni_dvp, NCPNULL, ndp->ni_vp, cnp); 2448 } 2449 } else { 2450 /* Just skip over the file handle */ 2451 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2452 i = fxdr_unsigned(int, *tl); 2453 nfsm_adv(nfsm_rndup(i)); 2454 } 2455 if (newvp != NULLVP) { 2456 if (newvp == vp) 2457 vrele(newvp); 2458 else 2459 vput(newvp); 2460 newvp = NULLVP; 2461 } 2462 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2463 more_dirs = fxdr_unsigned(int, *tl); 2464 } 2465 /* 2466 * If at end of rpc data, get the eof boolean 2467 */ 2468 if (!more_dirs) { 2469 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2470 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2471 } 2472 m_freem(mrep); 2473 } 2474 /* 2475 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2476 * by increasing d_reclen for the last record. 2477 */ 2478 if (blksiz > 0) { 2479 left = DIRBLKSIZ - blksiz; 2480 dp->d_reclen += left; 2481 uiop->uio_iov->iov_base += left; 2482 uiop->uio_iov->iov_len -= left; 2483 uiop->uio_offset += left; 2484 uiop->uio_resid -= left; 2485 } 2486 2487 /* 2488 * We are now either at the end of the directory or have filled the 2489 * block. 2490 */ 2491 if (bigenough) 2492 dnp->n_direofoffset = uiop->uio_offset; 2493 else { 2494 if (uiop->uio_resid > 0) 2495 printf("EEK! readdirplusrpc resid > 0\n"); 2496 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2497 *cookiep = cookie; 2498 } 2499 nfsmout: 2500 if (newvp != NULLVP) { 2501 if (newvp == vp) 2502 vrele(newvp); 2503 else 2504 vput(newvp); 2505 newvp = NULLVP; 2506 } 2507 return (error); 2508 } 2509 2510 /* 2511 * Silly rename. To make the NFS filesystem that is stateless look a little 2512 * more like the "ufs" a remove of an active vnode is translated to a rename 2513 * to a funny looking filename that is removed by nfs_inactive on the 2514 * nfsnode. There is the potential for another process on a different client 2515 * to create the same funny name between the nfs_lookitup() fails and the 2516 * nfs_rename() completes, but... 2517 */ 2518 static int 2519 nfs_sillyrename(dvp, vp, cnp) 2520 struct vnode *dvp, *vp; 2521 struct componentname *cnp; 2522 { 2523 struct sillyrename *sp; 2524 struct nfsnode *np; 2525 int error; 2526 2527 cache_purge(dvp); 2528 np = VTONFS(vp); 2529 #ifndef DIAGNOSTIC 2530 if (vp->v_type == VDIR) 2531 panic("nfs: sillyrename dir"); 2532 #endif 2533 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2534 M_NFSREQ, M_WAITOK); 2535 sp->s_cred = crdup(cnp->cn_cred); 2536 sp->s_dvp = dvp; 2537 VREF(dvp); 2538 2539 /* Fudge together a funny name */ 2540 sp->s_namlen = sprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2541 2542 /* Try lookitups until we get one that isn't there */ 2543 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2544 cnp->cn_td, (struct nfsnode **)0) == 0) { 2545 sp->s_name[4]++; 2546 if (sp->s_name[4] > 'z') { 2547 error = EINVAL; 2548 goto bad; 2549 } 2550 } 2551 error = nfs_renameit(dvp, cnp, sp); 2552 if (error) 2553 goto bad; 2554 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2555 cnp->cn_td, &np); 2556 np->n_sillyrename = sp; 2557 return (0); 2558 bad: 2559 vrele(sp->s_dvp); 2560 crfree(sp->s_cred); 2561 free((caddr_t)sp, M_NFSREQ); 2562 return (error); 2563 } 2564 2565 /* 2566 * Look up a file name and optionally either update the file handle or 2567 * allocate an nfsnode, depending on the value of npp. 2568 * npp == NULL --> just do the lookup 2569 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2570 * handled too 2571 * *npp != NULL --> update the file handle in the vnode 2572 */ 2573 static int 2574 nfs_lookitup(dvp, name, len, cred, td, npp) 2575 struct vnode *dvp; 2576 const char *name; 2577 int len; 2578 struct ucred *cred; 2579 struct thread *td; 2580 struct nfsnode **npp; 2581 { 2582 u_int32_t *tl; 2583 caddr_t cp; 2584 int32_t t1, t2; 2585 struct vnode *newvp = (struct vnode *)0; 2586 struct nfsnode *np, *dnp = VTONFS(dvp); 2587 caddr_t bpos, dpos, cp2; 2588 int error = 0, fhlen, attrflag; 2589 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2590 nfsfh_t *nfhp; 2591 int v3 = NFS_ISV3(dvp); 2592 2593 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2594 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2595 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2596 nfsm_fhtom(dvp, v3); 2597 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2598 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2599 if (npp && !error) { 2600 nfsm_getfh(nfhp, fhlen, v3); 2601 if (*npp) { 2602 np = *npp; 2603 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2604 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2605 np->n_fhp = &np->n_fh; 2606 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2607 np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); 2608 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2609 np->n_fhsize = fhlen; 2610 newvp = NFSTOV(np); 2611 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2612 VREF(dvp); 2613 newvp = dvp; 2614 } else { 2615 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2616 if (error) { 2617 m_freem(mrep); 2618 return (error); 2619 } 2620 newvp = NFSTOV(np); 2621 } 2622 if (v3) { 2623 nfsm_postop_attr(newvp, attrflag); 2624 if (!attrflag && *npp == NULL) { 2625 m_freem(mrep); 2626 if (newvp == dvp) 2627 vrele(newvp); 2628 else 2629 vput(newvp); 2630 return (ENOENT); 2631 } 2632 } else 2633 nfsm_loadattr(newvp, (struct vattr *)0); 2634 } 2635 nfsm_reqdone; 2636 if (npp && *npp == NULL) { 2637 if (error) { 2638 if (newvp) { 2639 if (newvp == dvp) 2640 vrele(newvp); 2641 else 2642 vput(newvp); 2643 } 2644 } else 2645 *npp = np; 2646 } 2647 return (error); 2648 } 2649 2650 /* 2651 * Nfs Version 3 commit rpc 2652 */ 2653 int 2654 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2655 { 2656 caddr_t cp; 2657 u_int32_t *tl; 2658 int32_t t1, t2; 2659 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2660 caddr_t bpos, dpos, cp2; 2661 int error = 0, wccflag = NFSV3_WCCRATTR; 2662 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2663 2664 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2665 return (0); 2666 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2667 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2668 nfsm_fhtom(vp, 1); 2669 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2670 txdr_hyper(offset, tl); 2671 tl += 2; 2672 *tl = txdr_unsigned(cnt); 2673 nfsm_request(vp, NFSPROC_COMMIT, td, nfs_vpcred(vp, ND_WRITE)); 2674 nfsm_wcc_data(vp, wccflag); 2675 if (!error) { 2676 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2677 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2678 NFSX_V3WRITEVERF)) { 2679 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2680 NFSX_V3WRITEVERF); 2681 error = NFSERR_STALEWRITEVERF; 2682 } 2683 } 2684 nfsm_reqdone; 2685 return (error); 2686 } 2687 2688 /* 2689 * Kludge City.. 2690 * - make nfs_bmap() essentially a no-op that does no translation 2691 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2692 * (Maybe I could use the process's page mapping, but I was concerned that 2693 * Kernel Write might not be enabled and also figured copyout() would do 2694 * a lot more work than bcopy() and also it currently happens in the 2695 * context of the swapper process (2). 2696 */ 2697 static int 2698 nfs_bmap(ap) 2699 struct vop_bmap_args /* { 2700 struct vnode *a_vp; 2701 daddr_t a_bn; 2702 struct vnode **a_vpp; 2703 daddr_t *a_bnp; 2704 int *a_runp; 2705 int *a_runb; 2706 } */ *ap; 2707 { 2708 struct vnode *vp = ap->a_vp; 2709 2710 if (ap->a_vpp != NULL) 2711 *ap->a_vpp = vp; 2712 if (ap->a_bnp != NULL) 2713 *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize); 2714 if (ap->a_runp != NULL) 2715 *ap->a_runp = 0; 2716 if (ap->a_runb != NULL) 2717 *ap->a_runb = 0; 2718 return (0); 2719 } 2720 2721 /* 2722 * Strategy routine. 2723 * For async requests when nfsiod(s) are running, queue the request by 2724 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2725 * request. 2726 */ 2727 static int 2728 nfs_strategy(ap) 2729 struct vop_strategy_args *ap; 2730 { 2731 struct buf *bp = ap->a_bp; 2732 struct thread *td; 2733 int error = 0; 2734 2735 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2736 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2737 2738 if (bp->b_flags & B_PHYS) 2739 panic("nfs physio"); 2740 2741 if (bp->b_flags & B_ASYNC) 2742 td = NULL; 2743 else 2744 td = curthread; /* XXX */ 2745 2746 /* 2747 * If the op is asynchronous and an i/o daemon is waiting 2748 * queue the request, wake it up and wait for completion 2749 * otherwise just do it ourselves. 2750 */ 2751 if ((bp->b_flags & B_ASYNC) == 0 || 2752 nfs_asyncio(bp, td)) 2753 error = nfs_doio(bp, td); 2754 return (error); 2755 } 2756 2757 /* 2758 * Mmap a file 2759 * 2760 * NB Currently unsupported. 2761 */ 2762 /* ARGSUSED */ 2763 static int 2764 nfs_mmap(ap) 2765 struct vop_mmap_args /* { 2766 struct vnode *a_vp; 2767 int a_fflags; 2768 struct ucred *a_cred; 2769 struct thread *a_td; 2770 } */ *ap; 2771 { 2772 2773 return (EINVAL); 2774 } 2775 2776 /* 2777 * fsync vnode op. Just call nfs_flush() with commit == 1. 2778 */ 2779 /* ARGSUSED */ 2780 static int 2781 nfs_fsync(ap) 2782 struct vop_fsync_args /* { 2783 struct vnodeop_desc *a_desc; 2784 struct vnode * a_vp; 2785 struct ucred * a_cred; 2786 int a_waitfor; 2787 struct thread * a_td; 2788 } */ *ap; 2789 { 2790 2791 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2792 } 2793 2794 /* 2795 * Flush all the blocks associated with a vnode. 2796 * Walk through the buffer pool and push any dirty pages 2797 * associated with the vnode. 2798 */ 2799 static int 2800 nfs_flush(vp, waitfor, td, commit) 2801 struct vnode *vp; 2802 int waitfor; 2803 struct thread *td; 2804 int commit; 2805 { 2806 struct nfsnode *np = VTONFS(vp); 2807 struct buf *bp; 2808 int i; 2809 struct buf *nbp; 2810 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2811 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2812 int passone = 1; 2813 u_quad_t off, endoff, toff; 2814 struct buf **bvec = NULL; 2815 #ifndef NFS_COMMITBVECSIZ 2816 #define NFS_COMMITBVECSIZ 20 2817 #endif 2818 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2819 int bvecsize = 0, bveccount; 2820 2821 if (nmp->nm_flag & NFSMNT_INT) 2822 slpflag = PCATCH; 2823 if (!commit) 2824 passone = 0; 2825 /* 2826 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2827 * server, but nas not been committed to stable storage on the server 2828 * yet. On the first pass, the byte range is worked out and the commit 2829 * rpc is done. On the second pass, nfs_writebp() is called to do the 2830 * job. 2831 */ 2832 again: 2833 off = (u_quad_t)-1; 2834 endoff = 0; 2835 bvecpos = 0; 2836 if (NFS_ISV3(vp) && commit) { 2837 s = splbio(); 2838 /* 2839 * Count up how many buffers waiting for a commit. 2840 */ 2841 bveccount = 0; 2842 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2843 nbp = TAILQ_NEXT(bp, b_vnbufs); 2844 if (BUF_REFCNT(bp) == 0 && 2845 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2846 == (B_DELWRI | B_NEEDCOMMIT)) 2847 bveccount++; 2848 } 2849 /* 2850 * Allocate space to remember the list of bufs to commit. It is 2851 * important to use M_NOWAIT here to avoid a race with nfs_write. 2852 * If we can't get memory (for whatever reason), we will end up 2853 * committing the buffers one-by-one in the loop below. 2854 */ 2855 if (bvec != NULL && bvec != bvec_on_stack) 2856 free(bvec, M_TEMP); 2857 if (bveccount > NFS_COMMITBVECSIZ) { 2858 bvec = (struct buf **) 2859 malloc(bveccount * sizeof(struct buf *), 2860 M_TEMP, M_NOWAIT); 2861 if (bvec == NULL) { 2862 bvec = bvec_on_stack; 2863 bvecsize = NFS_COMMITBVECSIZ; 2864 } else 2865 bvecsize = bveccount; 2866 } else { 2867 bvec = bvec_on_stack; 2868 bvecsize = NFS_COMMITBVECSIZ; 2869 } 2870 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2871 nbp = TAILQ_NEXT(bp, b_vnbufs); 2872 if (bvecpos >= bvecsize) 2873 break; 2874 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2875 (B_DELWRI | B_NEEDCOMMIT) || 2876 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 2877 continue; 2878 bremfree(bp); 2879 /* 2880 * NOTE: we are not clearing B_DONE here, so we have 2881 * to do it later on in this routine if we intend to 2882 * initiate I/O on the bp. 2883 * 2884 * Note: to avoid loopback deadlocks, we do not 2885 * assign b_runningbufspace. 2886 */ 2887 bp->b_flags |= B_WRITEINPROG; 2888 vfs_busy_pages(bp, 1); 2889 2890 /* 2891 * bp is protected by being locked, but nbp is not 2892 * and vfs_busy_pages() may sleep. We have to 2893 * recalculate nbp. 2894 */ 2895 nbp = TAILQ_NEXT(bp, b_vnbufs); 2896 2897 /* 2898 * A list of these buffers is kept so that the 2899 * second loop knows which buffers have actually 2900 * been committed. This is necessary, since there 2901 * may be a race between the commit rpc and new 2902 * uncommitted writes on the file. 2903 */ 2904 bvec[bvecpos++] = bp; 2905 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2906 bp->b_dirtyoff; 2907 if (toff < off) 2908 off = toff; 2909 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2910 if (toff > endoff) 2911 endoff = toff; 2912 } 2913 splx(s); 2914 } 2915 if (bvecpos > 0) { 2916 /* 2917 * Commit data on the server, as required. Note that 2918 * nfs_commit will use the vnode's cred for the commit. 2919 */ 2920 retv = nfs_commit(vp, off, (int)(endoff - off), td); 2921 2922 if (retv == NFSERR_STALEWRITEVERF) 2923 nfs_clearcommit(vp->v_mount); 2924 2925 /* 2926 * Now, either mark the blocks I/O done or mark the 2927 * blocks dirty, depending on whether the commit 2928 * succeeded. 2929 */ 2930 for (i = 0; i < bvecpos; i++) { 2931 bp = bvec[i]; 2932 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2933 if (retv) { 2934 /* 2935 * Error, leave B_DELWRI intact 2936 */ 2937 vfs_unbusy_pages(bp); 2938 brelse(bp); 2939 } else { 2940 /* 2941 * Success, remove B_DELWRI ( bundirty() ). 2942 * 2943 * b_dirtyoff/b_dirtyend seem to be NFS 2944 * specific. We should probably move that 2945 * into bundirty(). XXX 2946 */ 2947 s = splbio(); 2948 vp->v_numoutput++; 2949 bp->b_flags |= B_ASYNC; 2950 bundirty(bp); 2951 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 2952 bp->b_dirtyoff = bp->b_dirtyend = 0; 2953 splx(s); 2954 biodone(bp); 2955 } 2956 } 2957 } 2958 2959 /* 2960 * Start/do any write(s) that are required. 2961 */ 2962 loop: 2963 s = splbio(); 2964 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2965 nbp = TAILQ_NEXT(bp, b_vnbufs); 2966 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 2967 if (waitfor != MNT_WAIT || passone) 2968 continue; 2969 error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL, 2970 "nfsfsync", slpflag, slptimeo); 2971 splx(s); 2972 if (error == 0) 2973 panic("nfs_fsync: inconsistent lock"); 2974 if (error == ENOLCK) 2975 goto loop; 2976 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2977 error = EINTR; 2978 goto done; 2979 } 2980 if (slpflag == PCATCH) { 2981 slpflag = 0; 2982 slptimeo = 2 * hz; 2983 } 2984 goto loop; 2985 } 2986 if ((bp->b_flags & B_DELWRI) == 0) 2987 panic("nfs_fsync: not dirty"); 2988 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2989 BUF_UNLOCK(bp); 2990 continue; 2991 } 2992 bremfree(bp); 2993 if (passone || !commit) 2994 bp->b_flags |= B_ASYNC; 2995 else 2996 bp->b_flags |= B_ASYNC | B_WRITEINPROG; 2997 splx(s); 2998 VOP_BWRITE(bp->b_vp, bp); 2999 goto loop; 3000 } 3001 splx(s); 3002 if (passone) { 3003 passone = 0; 3004 goto again; 3005 } 3006 if (waitfor == MNT_WAIT) { 3007 while (vp->v_numoutput) { 3008 vp->v_flag |= VBWAIT; 3009 error = tsleep((caddr_t)&vp->v_numoutput, 3010 slpflag, "nfsfsync", slptimeo); 3011 if (error) { 3012 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 3013 error = EINTR; 3014 goto done; 3015 } 3016 if (slpflag == PCATCH) { 3017 slpflag = 0; 3018 slptimeo = 2 * hz; 3019 } 3020 } 3021 } 3022 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 3023 goto loop; 3024 } 3025 } 3026 if (np->n_flag & NWRITEERR) { 3027 error = np->n_error; 3028 np->n_flag &= ~NWRITEERR; 3029 } 3030 done: 3031 if (bvec != NULL && bvec != bvec_on_stack) 3032 free(bvec, M_TEMP); 3033 return (error); 3034 } 3035 3036 /* 3037 * NFS advisory byte-level locks. 3038 * Currently unsupported. 3039 */ 3040 static int 3041 nfs_advlock(ap) 3042 struct vop_advlock_args /* { 3043 struct vnode *a_vp; 3044 caddr_t a_id; 3045 int a_op; 3046 struct flock *a_fl; 3047 int a_flags; 3048 } */ *ap; 3049 { 3050 struct nfsnode *np = VTONFS(ap->a_vp); 3051 3052 /* 3053 * The following kludge is to allow diskless support to work 3054 * until a real NFS lockd is implemented. Basically, just pretend 3055 * that this is a local lock. 3056 */ 3057 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3058 } 3059 3060 /* 3061 * Print out the contents of an nfsnode. 3062 */ 3063 static int 3064 nfs_print(ap) 3065 struct vop_print_args /* { 3066 struct vnode *a_vp; 3067 } */ *ap; 3068 { 3069 struct vnode *vp = ap->a_vp; 3070 struct nfsnode *np = VTONFS(vp); 3071 3072 printf("tag VT_NFS, fileid %ld fsid 0x%x", 3073 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3074 if (vp->v_type == VFIFO) 3075 fifo_printinfo(vp); 3076 printf("\n"); 3077 return (0); 3078 } 3079 3080 /* 3081 * Just call nfs_writebp() with the force argument set to 1. 3082 * 3083 * NOTE: B_DONE may or may not be set in a_bp on call. 3084 */ 3085 static int 3086 nfs_bwrite(ap) 3087 struct vop_bwrite_args /* { 3088 struct vnode *a_bp; 3089 } */ *ap; 3090 { 3091 return (nfs_writebp(ap->a_bp, 1, curthread)); 3092 } 3093 3094 /* 3095 * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless 3096 * the force flag is one and it also handles the B_NEEDCOMMIT flag. We set 3097 * B_CACHE if this is a VMIO buffer. 3098 */ 3099 int 3100 nfs_writebp(bp, force, td) 3101 struct buf *bp; 3102 int force; 3103 struct thread *td; 3104 { 3105 int s; 3106 int oldflags = bp->b_flags; 3107 #if 0 3108 int retv = 1; 3109 off_t off; 3110 #endif 3111 3112 if (BUF_REFCNT(bp) == 0) 3113 panic("bwrite: buffer is not locked???"); 3114 3115 if (bp->b_flags & B_INVAL) { 3116 brelse(bp); 3117 return(0); 3118 } 3119 3120 bp->b_flags |= B_CACHE; 3121 3122 /* 3123 * Undirty the bp. We will redirty it later if the I/O fails. 3124 */ 3125 3126 s = splbio(); 3127 bundirty(bp); 3128 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 3129 3130 bp->b_vp->v_numoutput++; 3131 splx(s); 3132 3133 /* 3134 * Note: to avoid loopback deadlocks, we do not 3135 * assign b_runningbufspace. 3136 */ 3137 vfs_busy_pages(bp, 1); 3138 3139 if (force) 3140 bp->b_flags |= B_WRITEINPROG; 3141 BUF_KERNPROC(bp); 3142 VOP_STRATEGY(bp->b_vp, bp); 3143 3144 if( (oldflags & B_ASYNC) == 0) { 3145 int rtval = biowait(bp); 3146 3147 if (oldflags & B_DELWRI) { 3148 s = splbio(); 3149 reassignbuf(bp, bp->b_vp); 3150 splx(s); 3151 } 3152 3153 brelse(bp); 3154 return (rtval); 3155 } 3156 3157 return (0); 3158 } 3159 3160 /* 3161 * nfs special file access vnode op. 3162 * Essentially just get vattr and then imitate iaccess() since the device is 3163 * local to the client. 3164 */ 3165 static int 3166 nfsspec_access(ap) 3167 struct vop_access_args /* { 3168 struct vnode *a_vp; 3169 int a_mode; 3170 struct ucred *a_cred; 3171 struct thread *a_td; 3172 } */ *ap; 3173 { 3174 struct vattr *vap; 3175 gid_t *gp; 3176 struct ucred *cred = ap->a_cred; 3177 struct vnode *vp = ap->a_vp; 3178 mode_t mode = ap->a_mode; 3179 struct vattr vattr; 3180 int i; 3181 int error; 3182 3183 /* 3184 * Disallow write attempts on filesystems mounted read-only; 3185 * unless the file is a socket, fifo, or a block or character 3186 * device resident on the filesystem. 3187 */ 3188 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3189 switch (vp->v_type) { 3190 case VREG: 3191 case VDIR: 3192 case VLNK: 3193 return (EROFS); 3194 default: 3195 break; 3196 } 3197 } 3198 /* 3199 * If you're the super-user, 3200 * you always get access. 3201 */ 3202 if (cred->cr_uid == 0) 3203 return (0); 3204 vap = &vattr; 3205 error = VOP_GETATTR(vp, vap, ap->a_td); 3206 if (error) 3207 return (error); 3208 /* 3209 * Access check is based on only one of owner, group, public. 3210 * If not owner, then check group. If not a member of the 3211 * group, then check public access. 3212 */ 3213 if (cred->cr_uid != vap->va_uid) { 3214 mode >>= 3; 3215 gp = cred->cr_groups; 3216 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3217 if (vap->va_gid == *gp) 3218 goto found; 3219 mode >>= 3; 3220 found: 3221 ; 3222 } 3223 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3224 return (error); 3225 } 3226 3227 /* 3228 * Read wrapper for special devices. 3229 */ 3230 static int 3231 nfsspec_read(ap) 3232 struct vop_read_args /* { 3233 struct vnode *a_vp; 3234 struct uio *a_uio; 3235 int a_ioflag; 3236 struct ucred *a_cred; 3237 } */ *ap; 3238 { 3239 struct nfsnode *np = VTONFS(ap->a_vp); 3240 3241 /* 3242 * Set access flag. 3243 */ 3244 np->n_flag |= NACC; 3245 getnanotime(&np->n_atim); 3246 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3247 } 3248 3249 /* 3250 * Write wrapper for special devices. 3251 */ 3252 static int 3253 nfsspec_write(ap) 3254 struct vop_write_args /* { 3255 struct vnode *a_vp; 3256 struct uio *a_uio; 3257 int a_ioflag; 3258 struct ucred *a_cred; 3259 } */ *ap; 3260 { 3261 struct nfsnode *np = VTONFS(ap->a_vp); 3262 3263 /* 3264 * Set update flag. 3265 */ 3266 np->n_flag |= NUPD; 3267 getnanotime(&np->n_mtim); 3268 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3269 } 3270 3271 /* 3272 * Close wrapper for special devices. 3273 * 3274 * Update the times on the nfsnode then do device close. 3275 */ 3276 static int 3277 nfsspec_close(ap) 3278 struct vop_close_args /* { 3279 struct vnode *a_vp; 3280 int a_fflag; 3281 struct ucred *a_cred; 3282 struct thread *a_td; 3283 } */ *ap; 3284 { 3285 struct vnode *vp = ap->a_vp; 3286 struct nfsnode *np = VTONFS(vp); 3287 struct vattr vattr; 3288 3289 if (np->n_flag & (NACC | NUPD)) { 3290 np->n_flag |= NCHG; 3291 if (vp->v_usecount == 1 && 3292 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3293 VATTR_NULL(&vattr); 3294 if (np->n_flag & NACC) 3295 vattr.va_atime = np->n_atim; 3296 if (np->n_flag & NUPD) 3297 vattr.va_mtime = np->n_mtim; 3298 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE), ap->a_td); 3299 } 3300 } 3301 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3302 } 3303 3304 /* 3305 * Read wrapper for fifos. 3306 */ 3307 static int 3308 nfsfifo_read(ap) 3309 struct vop_read_args /* { 3310 struct vnode *a_vp; 3311 struct uio *a_uio; 3312 int a_ioflag; 3313 struct ucred *a_cred; 3314 } */ *ap; 3315 { 3316 struct nfsnode *np = VTONFS(ap->a_vp); 3317 3318 /* 3319 * Set access flag. 3320 */ 3321 np->n_flag |= NACC; 3322 getnanotime(&np->n_atim); 3323 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3324 } 3325 3326 /* 3327 * Write wrapper for fifos. 3328 */ 3329 static int 3330 nfsfifo_write(ap) 3331 struct vop_write_args /* { 3332 struct vnode *a_vp; 3333 struct uio *a_uio; 3334 int a_ioflag; 3335 struct ucred *a_cred; 3336 } */ *ap; 3337 { 3338 struct nfsnode *np = VTONFS(ap->a_vp); 3339 3340 /* 3341 * Set update flag. 3342 */ 3343 np->n_flag |= NUPD; 3344 getnanotime(&np->n_mtim); 3345 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3346 } 3347 3348 /* 3349 * Close wrapper for fifos. 3350 * 3351 * Update the times on the nfsnode then do fifo close. 3352 */ 3353 static int 3354 nfsfifo_close(ap) 3355 struct vop_close_args /* { 3356 struct vnode *a_vp; 3357 int a_fflag; 3358 struct thread *a_td; 3359 } */ *ap; 3360 { 3361 struct vnode *vp = ap->a_vp; 3362 struct nfsnode *np = VTONFS(vp); 3363 struct vattr vattr; 3364 struct timespec ts; 3365 3366 if (np->n_flag & (NACC | NUPD)) { 3367 getnanotime(&ts); 3368 if (np->n_flag & NACC) 3369 np->n_atim = ts; 3370 if (np->n_flag & NUPD) 3371 np->n_mtim = ts; 3372 np->n_flag |= NCHG; 3373 if (vp->v_usecount == 1 && 3374 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3375 VATTR_NULL(&vattr); 3376 if (np->n_flag & NACC) 3377 vattr.va_atime = np->n_atim; 3378 if (np->n_flag & NUPD) 3379 vattr.va_mtime = np->n_mtim; 3380 (void)VOP_SETATTR(vp, &vattr, nfs_vpcred(vp, ND_WRITE), ap->a_td); 3381 } 3382 } 3383 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3384 } 3385 3386