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 1.9 2003/08/07 21:17:42 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 "nfsnode.h" 79 #include "nfsmount.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 __P((struct vop_read_args *)); 102 static int nfsspec_write __P((struct vop_write_args *)); 103 static int nfsfifo_read __P((struct vop_read_args *)); 104 static int nfsfifo_write __P((struct vop_write_args *)); 105 static int nfsspec_close __P((struct vop_close_args *)); 106 static int nfsfifo_close __P((struct vop_close_args *)); 107 #define nfs_poll vop_nopoll 108 static int nfs_flush __P((struct vnode *,int,struct thread *,int)); 109 static int nfs_setattrrpc __P((struct vnode *,struct vattr *,struct ucred *,struct thread *)); 110 static int nfs_lookup __P((struct vop_lookup_args *)); 111 static int nfs_create __P((struct vop_create_args *)); 112 static int nfs_mknod __P((struct vop_mknod_args *)); 113 static int nfs_open __P((struct vop_open_args *)); 114 static int nfs_close __P((struct vop_close_args *)); 115 static int nfs_access __P((struct vop_access_args *)); 116 static int nfs_getattr __P((struct vop_getattr_args *)); 117 static int nfs_setattr __P((struct vop_setattr_args *)); 118 static int nfs_read __P((struct vop_read_args *)); 119 static int nfs_mmap __P((struct vop_mmap_args *)); 120 static int nfs_fsync __P((struct vop_fsync_args *)); 121 static int nfs_remove __P((struct vop_remove_args *)); 122 static int nfs_link __P((struct vop_link_args *)); 123 static int nfs_rename __P((struct vop_rename_args *)); 124 static int nfs_mkdir __P((struct vop_mkdir_args *)); 125 static int nfs_rmdir __P((struct vop_rmdir_args *)); 126 static int nfs_symlink __P((struct vop_symlink_args *)); 127 static int nfs_readdir __P((struct vop_readdir_args *)); 128 static int nfs_bmap __P((struct vop_bmap_args *)); 129 static int nfs_strategy __P((struct vop_strategy_args *)); 130 static int nfs_lookitup __P((struct vnode *, const char *, int, 131 struct ucred *, struct thread *, struct nfsnode **)); 132 static int nfs_sillyrename __P((struct vnode *,struct vnode *,struct componentname *)); 133 static int nfsspec_access __P((struct vop_access_args *)); 134 static int nfs_readlink __P((struct vop_readlink_args *)); 135 static int nfs_print __P((struct vop_print_args *)); 136 static int nfs_advlock __P((struct vop_advlock_args *)); 137 static int nfs_bwrite __P((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 __P((struct vnode *dvp, struct vnode **vpp, 232 struct componentname *cnp, 233 struct vattr *vap)); 234 static int nfs_removerpc __P((struct vnode *dvp, const char *name, 235 int namelen, 236 struct ucred *cred, struct thread *td)); 237 static int nfs_renamerpc __P((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 __P((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 return (error); 401 } else { 402 if ((error = nfsspec_access(ap)) != 0) 403 return (error); 404 405 /* 406 * Attempt to prevent a mapped root from accessing a file 407 * which it shouldn't. We try to read a byte from the file 408 * if the user is root and the file is not zero length. 409 * After calling nfsspec_access, we should have the correct 410 * file size cached. 411 */ 412 if (ap->a_cred->cr_uid == 0 && (ap->a_mode & VREAD) 413 && VTONFS(vp)->n_size > 0) { 414 struct iovec aiov; 415 struct uio auio; 416 char buf[1]; 417 418 aiov.iov_base = buf; 419 aiov.iov_len = 1; 420 auio.uio_iov = &aiov; 421 auio.uio_iovcnt = 1; 422 auio.uio_offset = 0; 423 auio.uio_resid = 1; 424 auio.uio_segflg = UIO_SYSSPACE; 425 auio.uio_rw = UIO_READ; 426 auio.uio_td = ap->a_td; 427 428 if (vp->v_type == VREG) 429 error = nfs_readrpc(vp, &auio); 430 else if (vp->v_type == VDIR) { 431 char* bp; 432 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); 433 aiov.iov_base = bp; 434 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; 435 error = nfs_readdirrpc(vp, &auio); 436 free(bp, M_TEMP); 437 } else if (vp->v_type == VLNK) 438 error = nfs_readlinkrpc(vp, &auio); 439 else 440 error = EACCES; 441 } 442 return (error); 443 } 444 } 445 446 /* 447 * nfs open vnode op 448 * Check to see if the type is ok 449 * and that deletion is not in progress. 450 * For paged in text files, you will need to flush the page cache 451 * if consistency is lost. 452 */ 453 /* ARGSUSED */ 454 static int 455 nfs_open(ap) 456 struct vop_open_args /* { 457 struct vnode *a_vp; 458 int a_mode; 459 struct ucred *a_cred; 460 struct thread *a_td; 461 } */ *ap; 462 { 463 struct vnode *vp = ap->a_vp; 464 struct nfsnode *np = VTONFS(vp); 465 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 466 struct vattr vattr; 467 int error; 468 469 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) { 470 #ifdef DIAGNOSTIC 471 printf("open eacces vtyp=%d\n",vp->v_type); 472 #endif 473 return (EACCES); 474 } 475 /* 476 * Get a valid lease. If cached data is stale, flush it. 477 */ 478 if (nmp->nm_flag & NFSMNT_NQNFS) { 479 if (NQNFS_CKINVALID(vp, np, ND_READ)) { 480 do { 481 error = nqnfs_getlease(vp, ND_READ, ap->a_td); 482 } while (error == NQNFS_EXPIRED); 483 if (error) 484 return (error); 485 if (np->n_lrev != np->n_brev || 486 (np->n_flag & NQNFSNONCACHE)) { 487 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) 488 == EINTR) { 489 return (error); 490 } 491 np->n_brev = np->n_lrev; 492 } 493 } 494 } else { 495 if (np->n_flag & NMODIFIED) { 496 if ((error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) 497 == EINTR) { 498 return (error); 499 } 500 np->n_attrstamp = 0; 501 if (vp->v_type == VDIR) 502 np->n_direofoffset = 0; 503 error = VOP_GETATTR(vp, &vattr, ap->a_td); 504 if (error) 505 return (error); 506 np->n_mtime = vattr.va_mtime.tv_sec; 507 } else { 508 error = VOP_GETATTR(vp, &vattr, ap->a_td); 509 if (error) 510 return (error); 511 if (np->n_mtime != vattr.va_mtime.tv_sec) { 512 if (vp->v_type == VDIR) 513 np->n_direofoffset = 0; 514 if ((error = nfs_vinvalbuf(vp, V_SAVE, 515 ap->a_td, 1)) == EINTR) { 516 return (error); 517 } 518 np->n_mtime = vattr.va_mtime.tv_sec; 519 } 520 } 521 } 522 if ((nmp->nm_flag & NFSMNT_NQNFS) == 0) 523 np->n_attrstamp = 0; /* For Open/Close consistency */ 524 return (0); 525 } 526 527 /* 528 * nfs close vnode op 529 * What an NFS client should do upon close after writing is a debatable issue. 530 * Most NFS clients push delayed writes to the server upon close, basically for 531 * two reasons: 532 * 1 - So that any write errors may be reported back to the client process 533 * doing the close system call. By far the two most likely errors are 534 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. 535 * 2 - To put a worst case upper bound on cache inconsistency between 536 * multiple clients for the file. 537 * There is also a consistency problem for Version 2 of the protocol w.r.t. 538 * not being able to tell if other clients are writing a file concurrently, 539 * since there is no way of knowing if the changed modify time in the reply 540 * is only due to the write for this client. 541 * (NFS Version 3 provides weak cache consistency data in the reply that 542 * should be sufficient to detect and handle this case.) 543 * 544 * The current code does the following: 545 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers 546 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate 547 * or commit them (this satisfies 1 and 2 except for the 548 * case where the server crashes after this close but 549 * before the commit RPC, which is felt to be "good 550 * enough". Changing the last argument to nfs_flush() to 551 * a 1 would force a commit operation, if it is felt a 552 * commit is necessary now. 553 * for NQNFS - do nothing now, since 2 is dealt with via leases and 554 * 1 should be dealt with via an fsync() system call for 555 * cases where write errors are important. 556 */ 557 /* ARGSUSED */ 558 static int 559 nfs_close(ap) 560 struct vop_close_args /* { 561 struct vnodeop_desc *a_desc; 562 struct vnode *a_vp; 563 int a_fflag; 564 struct ucred *a_cred; 565 struct thread *a_td; 566 } */ *ap; 567 { 568 struct vnode *vp = ap->a_vp; 569 struct nfsnode *np = VTONFS(vp); 570 int error = 0; 571 572 if (vp->v_type == VREG) { 573 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) == 0 && 574 (np->n_flag & NMODIFIED)) { 575 if (NFS_ISV3(vp)) { 576 /* 577 * Under NFSv3 we have dirty buffers to dispose of. We 578 * must flush them to the NFS server. We have the option 579 * of waiting all the way through the commit rpc or just 580 * waiting for the initial write. The default is to only 581 * wait through the initial write so the data is in the 582 * server's cache, which is roughly similar to the state 583 * a standard disk subsystem leaves the file in on close(). 584 * 585 * We cannot clear the NMODIFIED bit in np->n_flag due to 586 * potential races with other processes, and certainly 587 * cannot clear it if we don't commit. 588 */ 589 int cm = nfsv3_commit_on_close ? 1 : 0; 590 error = nfs_flush(vp, MNT_WAIT, ap->a_td, cm); 591 /* np->n_flag &= ~NMODIFIED; */ 592 } else { 593 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 594 } 595 np->n_attrstamp = 0; 596 } 597 if (np->n_flag & NWRITEERR) { 598 np->n_flag &= ~NWRITEERR; 599 error = np->n_error; 600 } 601 } 602 return (error); 603 } 604 605 /* 606 * nfs getattr call from vfs. 607 */ 608 static int 609 nfs_getattr(ap) 610 struct vop_getattr_args /* { 611 struct vnode *a_vp; 612 struct vattr *a_vap; 613 struct ucred *a_cred; 614 struct thread *a_td; 615 } */ *ap; 616 { 617 struct vnode *vp = ap->a_vp; 618 struct nfsnode *np = VTONFS(vp); 619 caddr_t cp; 620 u_int32_t *tl; 621 int32_t t1, t2; 622 caddr_t bpos, dpos; 623 int error = 0; 624 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 625 int v3 = NFS_ISV3(vp); 626 627 /* 628 * Update local times for special files. 629 */ 630 if (np->n_flag & (NACC | NUPD)) 631 np->n_flag |= NCHG; 632 /* 633 * First look in the cache. 634 */ 635 if (nfs_getattrcache(vp, ap->a_vap) == 0) 636 return (0); 637 638 if (v3 && nfsaccess_cache_timeout > 0) { 639 nfsstats.accesscache_misses++; 640 nfs3_access_otw(vp, NFSV3ACCESS_ALL, ap->a_td, NFSVPCRED(vp)); 641 if (nfs_getattrcache(vp, ap->a_vap) == 0) 642 return (0); 643 } 644 645 nfsstats.rpccnt[NFSPROC_GETATTR]++; 646 nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); 647 nfsm_fhtom(vp, v3); 648 nfsm_request(vp, NFSPROC_GETATTR, ap->a_td, NFSVPCRED(vp)); 649 if (!error) { 650 nfsm_loadattr(vp, ap->a_vap); 651 } 652 nfsm_reqdone; 653 return (error); 654 } 655 656 /* 657 * nfs setattr call. 658 */ 659 static int 660 nfs_setattr(ap) 661 struct vop_setattr_args /* { 662 struct vnodeop_desc *a_desc; 663 struct vnode *a_vp; 664 struct vattr *a_vap; 665 struct ucred *a_cred; 666 struct thread *a_td; 667 } */ *ap; 668 { 669 struct vnode *vp = ap->a_vp; 670 struct nfsnode *np = VTONFS(vp); 671 struct vattr *vap = ap->a_vap; 672 int error = 0; 673 u_quad_t tsize; 674 675 #ifndef nolint 676 tsize = (u_quad_t)0; 677 #endif 678 679 /* 680 * Setting of flags is not supported. 681 */ 682 if (vap->va_flags != VNOVAL) 683 return (EOPNOTSUPP); 684 685 /* 686 * Disallow write attempts if the filesystem is mounted read-only. 687 */ 688 if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || 689 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || 690 vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && 691 (vp->v_mount->mnt_flag & MNT_RDONLY)) 692 return (EROFS); 693 if (vap->va_size != VNOVAL) { 694 switch (vp->v_type) { 695 case VDIR: 696 return (EISDIR); 697 case VCHR: 698 case VBLK: 699 case VSOCK: 700 case VFIFO: 701 if (vap->va_mtime.tv_sec == VNOVAL && 702 vap->va_atime.tv_sec == VNOVAL && 703 vap->va_mode == (mode_t)VNOVAL && 704 vap->va_uid == (uid_t)VNOVAL && 705 vap->va_gid == (gid_t)VNOVAL) 706 return (0); 707 vap->va_size = VNOVAL; 708 break; 709 default: 710 /* 711 * Disallow write attempts if the filesystem is 712 * mounted read-only. 713 */ 714 if (vp->v_mount->mnt_flag & MNT_RDONLY) 715 return (EROFS); 716 717 /* 718 * We run vnode_pager_setsize() early (why?), 719 * we must set np->n_size now to avoid vinvalbuf 720 * V_SAVE races that might setsize a lower 721 * value. 722 */ 723 724 tsize = np->n_size; 725 error = nfs_meta_setsize(vp, ap->a_td, vap->va_size); 726 727 if (np->n_flag & NMODIFIED) { 728 if (vap->va_size == 0) 729 error = nfs_vinvalbuf(vp, 0, ap->a_td, 1); 730 else 731 error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); 732 if (error) { 733 np->n_size = tsize; 734 vnode_pager_setsize(vp, np->n_size); 735 return (error); 736 } 737 } 738 np->n_vattr.va_size = vap->va_size; 739 }; 740 } else if ((vap->va_mtime.tv_sec != VNOVAL || 741 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 742 vp->v_type == VREG && 743 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) 744 return (error); 745 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 746 if (error && vap->va_size != VNOVAL) { 747 np->n_size = np->n_vattr.va_size = tsize; 748 vnode_pager_setsize(vp, np->n_size); 749 } 750 return (error); 751 } 752 753 /* 754 * Do an nfs setattr rpc. 755 */ 756 static int 757 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 758 struct ucred *cred, struct thread *td) 759 { 760 struct nfsv2_sattr *sp; 761 caddr_t cp; 762 int32_t t1, t2; 763 caddr_t bpos, dpos, cp2; 764 u_int32_t *tl; 765 int error = 0, wccflag = NFSV3_WCCRATTR; 766 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 767 int v3 = NFS_ISV3(vp); 768 769 nfsstats.rpccnt[NFSPROC_SETATTR]++; 770 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 771 nfsm_fhtom(vp, v3); 772 if (v3) { 773 nfsm_v3attrbuild(vap, TRUE); 774 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 775 *tl = nfs_false; 776 } else { 777 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 778 if (vap->va_mode == (mode_t)VNOVAL) 779 sp->sa_mode = nfs_xdrneg1; 780 else 781 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 782 if (vap->va_uid == (uid_t)VNOVAL) 783 sp->sa_uid = nfs_xdrneg1; 784 else 785 sp->sa_uid = txdr_unsigned(vap->va_uid); 786 if (vap->va_gid == (gid_t)VNOVAL) 787 sp->sa_gid = nfs_xdrneg1; 788 else 789 sp->sa_gid = txdr_unsigned(vap->va_gid); 790 sp->sa_size = txdr_unsigned(vap->va_size); 791 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 792 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 793 } 794 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 795 if (v3) { 796 nfsm_wcc_data(vp, wccflag); 797 } else 798 nfsm_loadattr(vp, (struct vattr *)0); 799 nfsm_reqdone; 800 return (error); 801 } 802 803 /* 804 * nfs lookup call, one step at a time... 805 * First look in cache 806 * If not found, unlock the directory nfsnode and do the rpc 807 */ 808 static int 809 nfs_lookup(ap) 810 struct vop_lookup_args /* { 811 struct vnodeop_desc *a_desc; 812 struct vnode *a_dvp; 813 struct vnode **a_vpp; 814 struct componentname *a_cnp; 815 } */ *ap; 816 { 817 struct componentname *cnp = ap->a_cnp; 818 struct vnode *dvp = ap->a_dvp; 819 struct vnode **vpp = ap->a_vpp; 820 int flags = cnp->cn_flags; 821 struct vnode *newvp; 822 u_int32_t *tl; 823 caddr_t cp; 824 int32_t t1, t2; 825 struct nfsmount *nmp; 826 caddr_t bpos, dpos, cp2; 827 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 828 long len; 829 nfsfh_t *fhp; 830 struct nfsnode *np; 831 int lockparent, wantparent, error = 0, attrflag, fhsize; 832 int v3 = NFS_ISV3(dvp); 833 struct thread *td = cnp->cn_td; 834 835 *vpp = NULLVP; 836 if ((flags & ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 837 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) 838 return (EROFS); 839 if (dvp->v_type != VDIR) 840 return (ENOTDIR); 841 lockparent = flags & LOCKPARENT; 842 wantparent = flags & (LOCKPARENT|WANTPARENT); 843 nmp = VFSTONFS(dvp->v_mount); 844 np = VTONFS(dvp); 845 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 846 struct vattr vattr; 847 int vpid; 848 849 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 850 *vpp = NULLVP; 851 return (error); 852 } 853 854 newvp = *vpp; 855 vpid = newvp->v_id; 856 /* 857 * See the comment starting `Step through' in ufs/ufs_lookup.c 858 * for an explanation of the locking protocol 859 */ 860 if (dvp == newvp) { 861 VREF(newvp); 862 error = 0; 863 } else if (flags & ISDOTDOT) { 864 VOP_UNLOCK(dvp, 0, td); 865 error = vget(newvp, LK_EXCLUSIVE, td); 866 if (!error && lockparent && (flags & ISLASTCN)) 867 error = vn_lock(dvp, LK_EXCLUSIVE, td); 868 } else { 869 error = vget(newvp, LK_EXCLUSIVE, td); 870 if (!lockparent || error || !(flags & ISLASTCN)) 871 VOP_UNLOCK(dvp, 0, td); 872 } 873 if (!error) { 874 if (vpid == newvp->v_id) { 875 if (!VOP_GETATTR(newvp, &vattr, td) 876 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 877 nfsstats.lookupcache_hits++; 878 if (cnp->cn_nameiop != LOOKUP && 879 (flags & ISLASTCN)) 880 cnp->cn_flags |= SAVENAME; 881 return (0); 882 } 883 cache_purge(newvp); 884 } 885 vput(newvp); 886 if (lockparent && dvp != newvp && (flags & ISLASTCN)) 887 VOP_UNLOCK(dvp, 0, td); 888 } 889 error = vn_lock(dvp, LK_EXCLUSIVE, td); 890 *vpp = NULLVP; 891 if (error) 892 return (error); 893 } 894 error = 0; 895 newvp = NULLVP; 896 nfsstats.lookupcache_misses++; 897 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 898 len = cnp->cn_namelen; 899 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 900 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 901 nfsm_fhtom(dvp, v3); 902 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 903 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 904 if (error) { 905 nfsm_postop_attr(dvp, attrflag); 906 m_freem(mrep); 907 goto nfsmout; 908 } 909 nfsm_getfh(fhp, fhsize, v3); 910 911 /* 912 * Handle RENAME case... 913 */ 914 if (cnp->cn_nameiop == RENAME && wantparent && (flags & ISLASTCN)) { 915 if (NFS_CMPFH(np, fhp, fhsize)) { 916 m_freem(mrep); 917 return (EISDIR); 918 } 919 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 920 if (error) { 921 m_freem(mrep); 922 return (error); 923 } 924 newvp = NFSTOV(np); 925 if (v3) { 926 nfsm_postop_attr(newvp, attrflag); 927 nfsm_postop_attr(dvp, attrflag); 928 } else 929 nfsm_loadattr(newvp, (struct vattr *)0); 930 *vpp = newvp; 931 m_freem(mrep); 932 cnp->cn_flags |= SAVENAME; 933 if (!lockparent) 934 VOP_UNLOCK(dvp, 0, td); 935 return (0); 936 } 937 938 if (flags & ISDOTDOT) { 939 VOP_UNLOCK(dvp, 0, td); 940 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 941 if (error) { 942 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 943 return (error); 944 } 945 newvp = NFSTOV(np); 946 if (lockparent && (flags & ISLASTCN) && 947 (error = vn_lock(dvp, LK_EXCLUSIVE, td))) { 948 vput(newvp); 949 return (error); 950 } 951 } else if (NFS_CMPFH(np, fhp, fhsize)) { 952 VREF(dvp); 953 newvp = dvp; 954 } else { 955 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 956 if (error) { 957 m_freem(mrep); 958 return (error); 959 } 960 if (!lockparent || !(flags & ISLASTCN)) 961 VOP_UNLOCK(dvp, 0, td); 962 newvp = NFSTOV(np); 963 } 964 if (v3) { 965 nfsm_postop_attr(newvp, attrflag); 966 nfsm_postop_attr(dvp, attrflag); 967 } else 968 nfsm_loadattr(newvp, (struct vattr *)0); 969 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 970 cnp->cn_flags |= SAVENAME; 971 if ((cnp->cn_flags & MAKEENTRY) && 972 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN))) { 973 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 974 cache_enter(dvp, newvp, cnp); 975 } 976 *vpp = newvp; 977 nfsm_reqdone; 978 if (error) { 979 if (newvp != NULLVP) { 980 vrele(newvp); 981 *vpp = NULLVP; 982 } 983 if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && 984 (flags & ISLASTCN) && error == ENOENT) { 985 if (!lockparent) 986 VOP_UNLOCK(dvp, 0, td); 987 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 988 error = EROFS; 989 else 990 error = EJUSTRETURN; 991 } 992 if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) 993 cnp->cn_flags |= SAVENAME; 994 } 995 return (error); 996 } 997 998 /* 999 * nfs read call. 1000 * Just call nfs_bioread() to do the work. 1001 */ 1002 static int 1003 nfs_read(ap) 1004 struct vop_read_args /* { 1005 struct vnode *a_vp; 1006 struct uio *a_uio; 1007 int a_ioflag; 1008 struct ucred *a_cred; 1009 } */ *ap; 1010 { 1011 struct vnode *vp = ap->a_vp; 1012 1013 if (vp->v_type != VREG) 1014 return (EPERM); 1015 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1016 } 1017 1018 /* 1019 * nfs readlink call 1020 */ 1021 static int 1022 nfs_readlink(ap) 1023 struct vop_readlink_args /* { 1024 struct vnode *a_vp; 1025 struct uio *a_uio; 1026 struct ucred *a_cred; 1027 } */ *ap; 1028 { 1029 struct vnode *vp = ap->a_vp; 1030 1031 if (vp->v_type != VLNK) 1032 return (EINVAL); 1033 return (nfs_bioread(vp, ap->a_uio, 0)); 1034 } 1035 1036 /* 1037 * Do a readlink rpc. 1038 * Called by nfs_doio() from below the buffer cache. 1039 */ 1040 int 1041 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1042 { 1043 u_int32_t *tl; 1044 caddr_t cp; 1045 int32_t t1, t2; 1046 caddr_t bpos, dpos, cp2; 1047 int error = 0, len, attrflag; 1048 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1049 int v3 = NFS_ISV3(vp); 1050 1051 nfsstats.rpccnt[NFSPROC_READLINK]++; 1052 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1053 nfsm_fhtom(vp, v3); 1054 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, NFSVPCRED(vp)); 1055 if (v3) 1056 nfsm_postop_attr(vp, attrflag); 1057 if (!error) { 1058 nfsm_strsiz(len, NFS_MAXPATHLEN); 1059 if (len == NFS_MAXPATHLEN) { 1060 struct nfsnode *np = VTONFS(vp); 1061 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1062 len = np->n_size; 1063 } 1064 nfsm_mtouio(uiop, len); 1065 } 1066 nfsm_reqdone; 1067 return (error); 1068 } 1069 1070 /* 1071 * nfs read rpc call 1072 * Ditto above 1073 */ 1074 int 1075 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1076 { 1077 u_int32_t *tl; 1078 caddr_t cp; 1079 int32_t t1, t2; 1080 caddr_t bpos, dpos, cp2; 1081 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1082 struct nfsmount *nmp; 1083 int error = 0, len, retlen, tsiz, eof, attrflag; 1084 int v3 = NFS_ISV3(vp); 1085 1086 #ifndef nolint 1087 eof = 0; 1088 #endif 1089 nmp = VFSTONFS(vp->v_mount); 1090 tsiz = uiop->uio_resid; 1091 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1092 return (EFBIG); 1093 while (tsiz > 0) { 1094 nfsstats.rpccnt[NFSPROC_READ]++; 1095 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1096 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1097 nfsm_fhtom(vp, v3); 1098 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1099 if (v3) { 1100 txdr_hyper(uiop->uio_offset, tl); 1101 *(tl + 2) = txdr_unsigned(len); 1102 } else { 1103 *tl++ = txdr_unsigned(uiop->uio_offset); 1104 *tl++ = txdr_unsigned(len); 1105 *tl = 0; 1106 } 1107 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, NFSVPCRED(vp)); 1108 if (v3) { 1109 nfsm_postop_attr(vp, attrflag); 1110 if (error) { 1111 m_freem(mrep); 1112 goto nfsmout; 1113 } 1114 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1115 eof = fxdr_unsigned(int, *(tl + 1)); 1116 } else 1117 nfsm_loadattr(vp, (struct vattr *)0); 1118 nfsm_strsiz(retlen, nmp->nm_rsize); 1119 nfsm_mtouio(uiop, retlen); 1120 m_freem(mrep); 1121 tsiz -= retlen; 1122 if (v3) { 1123 if (eof || retlen == 0) { 1124 tsiz = 0; 1125 } 1126 } else if (retlen < len) { 1127 tsiz = 0; 1128 } 1129 } 1130 nfsmout: 1131 return (error); 1132 } 1133 1134 /* 1135 * nfs write call 1136 */ 1137 int 1138 nfs_writerpc(vp, uiop, iomode, must_commit) 1139 struct vnode *vp; 1140 struct uio *uiop; 1141 int *iomode, *must_commit; 1142 { 1143 u_int32_t *tl; 1144 caddr_t cp; 1145 int32_t t1, t2, backup; 1146 caddr_t bpos, dpos, cp2; 1147 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1148 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1149 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1150 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1151 1152 #ifndef DIAGNOSTIC 1153 if (uiop->uio_iovcnt != 1) 1154 panic("nfs: writerpc iovcnt > 1"); 1155 #endif 1156 *must_commit = 0; 1157 tsiz = uiop->uio_resid; 1158 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1159 return (EFBIG); 1160 while (tsiz > 0) { 1161 nfsstats.rpccnt[NFSPROC_WRITE]++; 1162 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1163 nfsm_reqhead(vp, NFSPROC_WRITE, 1164 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1165 nfsm_fhtom(vp, v3); 1166 if (v3) { 1167 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1168 txdr_hyper(uiop->uio_offset, tl); 1169 tl += 2; 1170 *tl++ = txdr_unsigned(len); 1171 *tl++ = txdr_unsigned(*iomode); 1172 *tl = txdr_unsigned(len); 1173 } else { 1174 u_int32_t x; 1175 1176 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1177 /* Set both "begin" and "current" to non-garbage. */ 1178 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1179 *tl++ = x; /* "begin offset" */ 1180 *tl++ = x; /* "current offset" */ 1181 x = txdr_unsigned(len); 1182 *tl++ = x; /* total to this offset */ 1183 *tl = x; /* size of this write */ 1184 } 1185 nfsm_uiotom(uiop, len); 1186 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, NFSVPCRED(vp)); 1187 if (v3) { 1188 wccflag = NFSV3_WCCCHK; 1189 nfsm_wcc_data(vp, wccflag); 1190 if (!error) { 1191 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1192 + NFSX_V3WRITEVERF); 1193 rlen = fxdr_unsigned(int, *tl++); 1194 if (rlen == 0) { 1195 error = NFSERR_IO; 1196 m_freem(mrep); 1197 break; 1198 } else if (rlen < len) { 1199 backup = len - rlen; 1200 uiop->uio_iov->iov_base -= backup; 1201 uiop->uio_iov->iov_len += backup; 1202 uiop->uio_offset -= backup; 1203 uiop->uio_resid += backup; 1204 len = rlen; 1205 } 1206 commit = fxdr_unsigned(int, *tl++); 1207 1208 /* 1209 * Return the lowest committment level 1210 * obtained by any of the RPCs. 1211 */ 1212 if (committed == NFSV3WRITE_FILESYNC) 1213 committed = commit; 1214 else if (committed == NFSV3WRITE_DATASYNC && 1215 commit == NFSV3WRITE_UNSTABLE) 1216 committed = commit; 1217 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1218 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1219 NFSX_V3WRITEVERF); 1220 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1221 } else if (bcmp((caddr_t)tl, 1222 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1223 *must_commit = 1; 1224 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1225 NFSX_V3WRITEVERF); 1226 } 1227 } 1228 } else 1229 nfsm_loadattr(vp, (struct vattr *)0); 1230 if (wccflag) 1231 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1232 m_freem(mrep); 1233 if (error) 1234 break; 1235 tsiz -= len; 1236 } 1237 nfsmout: 1238 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1239 committed = NFSV3WRITE_FILESYNC; 1240 *iomode = committed; 1241 if (error) 1242 uiop->uio_resid = tsiz; 1243 return (error); 1244 } 1245 1246 /* 1247 * nfs mknod rpc 1248 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1249 * mode set to specify the file type and the size field for rdev. 1250 */ 1251 static int 1252 nfs_mknodrpc(dvp, vpp, cnp, vap) 1253 struct vnode *dvp; 1254 struct vnode **vpp; 1255 struct componentname *cnp; 1256 struct vattr *vap; 1257 { 1258 struct nfsv2_sattr *sp; 1259 u_int32_t *tl; 1260 caddr_t cp; 1261 int32_t t1, t2; 1262 struct vnode *newvp = (struct vnode *)0; 1263 struct nfsnode *np = (struct nfsnode *)0; 1264 struct vattr vattr; 1265 char *cp2; 1266 caddr_t bpos, dpos; 1267 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1268 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1269 u_int32_t rdev; 1270 int v3 = NFS_ISV3(dvp); 1271 1272 if (vap->va_type == VCHR || vap->va_type == VBLK) 1273 rdev = txdr_unsigned(vap->va_rdev); 1274 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1275 rdev = nfs_xdrneg1; 1276 else { 1277 return (EOPNOTSUPP); 1278 } 1279 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1280 return (error); 1281 } 1282 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1283 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1284 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1285 nfsm_fhtom(dvp, v3); 1286 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1287 if (v3) { 1288 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1289 *tl++ = vtonfsv3_type(vap->va_type); 1290 nfsm_v3attrbuild(vap, FALSE); 1291 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1292 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1293 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1294 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1295 } 1296 } else { 1297 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1298 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1299 sp->sa_uid = nfs_xdrneg1; 1300 sp->sa_gid = nfs_xdrneg1; 1301 sp->sa_size = rdev; 1302 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1303 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1304 } 1305 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1306 if (!error) { 1307 nfsm_mtofh(dvp, newvp, v3, gotvp); 1308 if (!gotvp) { 1309 if (newvp) { 1310 vput(newvp); 1311 newvp = (struct vnode *)0; 1312 } 1313 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1314 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1315 if (!error) 1316 newvp = NFSTOV(np); 1317 } 1318 } 1319 if (v3) 1320 nfsm_wcc_data(dvp, wccflag); 1321 nfsm_reqdone; 1322 if (error) { 1323 if (newvp) 1324 vput(newvp); 1325 } else { 1326 if (cnp->cn_flags & MAKEENTRY) 1327 cache_enter(dvp, newvp, cnp); 1328 *vpp = newvp; 1329 } 1330 VTONFS(dvp)->n_flag |= NMODIFIED; 1331 if (!wccflag) 1332 VTONFS(dvp)->n_attrstamp = 0; 1333 return (error); 1334 } 1335 1336 /* 1337 * nfs mknod vop 1338 * just call nfs_mknodrpc() to do the work. 1339 */ 1340 /* ARGSUSED */ 1341 static int 1342 nfs_mknod(ap) 1343 struct vop_mknod_args /* { 1344 struct vnode *a_dvp; 1345 struct vnode **a_vpp; 1346 struct componentname *a_cnp; 1347 struct vattr *a_vap; 1348 } */ *ap; 1349 { 1350 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1351 } 1352 1353 static u_long create_verf; 1354 /* 1355 * nfs file create call 1356 */ 1357 static int 1358 nfs_create(ap) 1359 struct vop_create_args /* { 1360 struct vnode *a_dvp; 1361 struct vnode **a_vpp; 1362 struct componentname *a_cnp; 1363 struct vattr *a_vap; 1364 } */ *ap; 1365 { 1366 struct vnode *dvp = ap->a_dvp; 1367 struct vattr *vap = ap->a_vap; 1368 struct componentname *cnp = ap->a_cnp; 1369 struct nfsv2_sattr *sp; 1370 u_int32_t *tl; 1371 caddr_t cp; 1372 int32_t t1, t2; 1373 struct nfsnode *np = (struct nfsnode *)0; 1374 struct vnode *newvp = (struct vnode *)0; 1375 caddr_t bpos, dpos, cp2; 1376 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1377 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1378 struct vattr vattr; 1379 int v3 = NFS_ISV3(dvp); 1380 1381 /* 1382 * Oops, not for me.. 1383 */ 1384 if (vap->va_type == VSOCK) 1385 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1386 1387 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1388 return (error); 1389 } 1390 if (vap->va_vaflags & VA_EXCLUSIVE) 1391 fmode |= O_EXCL; 1392 again: 1393 nfsstats.rpccnt[NFSPROC_CREATE]++; 1394 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1395 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1396 nfsm_fhtom(dvp, v3); 1397 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1398 if (v3) { 1399 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1400 if (fmode & O_EXCL) { 1401 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1402 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1403 #ifdef INET 1404 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1405 *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr; 1406 else 1407 #endif 1408 *tl++ = create_verf; 1409 *tl = ++create_verf; 1410 } else { 1411 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1412 nfsm_v3attrbuild(vap, FALSE); 1413 } 1414 } else { 1415 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1416 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1417 sp->sa_uid = nfs_xdrneg1; 1418 sp->sa_gid = nfs_xdrneg1; 1419 sp->sa_size = 0; 1420 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1421 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1422 } 1423 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1424 if (!error) { 1425 nfsm_mtofh(dvp, newvp, v3, gotvp); 1426 if (!gotvp) { 1427 if (newvp) { 1428 vput(newvp); 1429 newvp = (struct vnode *)0; 1430 } 1431 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1432 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1433 if (!error) 1434 newvp = NFSTOV(np); 1435 } 1436 } 1437 if (v3) 1438 nfsm_wcc_data(dvp, wccflag); 1439 nfsm_reqdone; 1440 if (error) { 1441 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1442 fmode &= ~O_EXCL; 1443 goto again; 1444 } 1445 if (newvp) 1446 vput(newvp); 1447 } else if (v3 && (fmode & O_EXCL)) { 1448 /* 1449 * We are normally called with only a partially initialized 1450 * VAP. Since the NFSv3 spec says that server may use the 1451 * file attributes to store the verifier, the spec requires 1452 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1453 * in atime, but we can't really assume that all servers will 1454 * so we ensure that our SETATTR sets both atime and mtime. 1455 */ 1456 if (vap->va_mtime.tv_sec == VNOVAL) 1457 vfs_timestamp(&vap->va_mtime); 1458 if (vap->va_atime.tv_sec == VNOVAL) 1459 vap->va_atime = vap->va_mtime; 1460 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1461 } 1462 if (!error) { 1463 if (cnp->cn_flags & MAKEENTRY) 1464 cache_enter(dvp, newvp, cnp); 1465 *ap->a_vpp = newvp; 1466 } 1467 VTONFS(dvp)->n_flag |= NMODIFIED; 1468 if (!wccflag) 1469 VTONFS(dvp)->n_attrstamp = 0; 1470 return (error); 1471 } 1472 1473 /* 1474 * nfs file remove call 1475 * To try and make nfs semantics closer to ufs semantics, a file that has 1476 * other processes using the vnode is renamed instead of removed and then 1477 * removed later on the last close. 1478 * - If v_usecount > 1 1479 * If a rename is not already in the works 1480 * call nfs_sillyrename() to set it up 1481 * else 1482 * do the remove rpc 1483 */ 1484 static int 1485 nfs_remove(ap) 1486 struct vop_remove_args /* { 1487 struct vnodeop_desc *a_desc; 1488 struct vnode * a_dvp; 1489 struct vnode * a_vp; 1490 struct componentname * a_cnp; 1491 } */ *ap; 1492 { 1493 struct vnode *vp = ap->a_vp; 1494 struct vnode *dvp = ap->a_dvp; 1495 struct componentname *cnp = ap->a_cnp; 1496 struct nfsnode *np = VTONFS(vp); 1497 int error = 0; 1498 struct vattr vattr; 1499 1500 #ifndef DIAGNOSTIC 1501 if ((cnp->cn_flags & HASBUF) == 0) 1502 panic("nfs_remove: no name"); 1503 if (vp->v_usecount < 1) 1504 panic("nfs_remove: bad v_usecount"); 1505 #endif 1506 if (vp->v_type == VDIR) 1507 error = EPERM; 1508 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1509 VOP_GETATTR(vp, &vattr, cnp->cn_td) == 0 && 1510 vattr.va_nlink > 1)) { 1511 /* 1512 * Purge the name cache so that the chance of a lookup for 1513 * the name succeeding while the remove is in progress is 1514 * minimized. Without node locking it can still happen, such 1515 * that an I/O op returns ESTALE, but since you get this if 1516 * another host removes the file.. 1517 */ 1518 cache_purge(vp); 1519 /* 1520 * throw away biocache buffers, mainly to avoid 1521 * unnecessary delayed writes later. 1522 */ 1523 error = nfs_vinvalbuf(vp, 0, cnp->cn_td, 1); 1524 /* Do the rpc */ 1525 if (error != EINTR) 1526 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1527 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1528 /* 1529 * Kludge City: If the first reply to the remove rpc is lost.. 1530 * the reply to the retransmitted request will be ENOENT 1531 * since the file was in fact removed 1532 * Therefore, we cheat and return success. 1533 */ 1534 if (error == ENOENT) 1535 error = 0; 1536 } else if (!np->n_sillyrename) 1537 error = nfs_sillyrename(dvp, vp, cnp); 1538 np->n_attrstamp = 0; 1539 return (error); 1540 } 1541 1542 /* 1543 * nfs file remove rpc called from nfs_inactive 1544 */ 1545 int 1546 nfs_removeit(struct sillyrename *sp) 1547 { 1548 1549 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1550 sp->s_cred, NULL)); 1551 } 1552 1553 /* 1554 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1555 */ 1556 static int 1557 nfs_removerpc(dvp, name, namelen, cred, td) 1558 struct vnode *dvp; 1559 const char *name; 1560 int namelen; 1561 struct ucred *cred; 1562 struct thread *td; 1563 { 1564 u_int32_t *tl; 1565 caddr_t cp; 1566 int32_t t1, t2; 1567 caddr_t bpos, dpos, cp2; 1568 int error = 0, wccflag = NFSV3_WCCRATTR; 1569 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1570 int v3 = NFS_ISV3(dvp); 1571 1572 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1573 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1574 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1575 nfsm_fhtom(dvp, v3); 1576 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1577 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1578 if (v3) 1579 nfsm_wcc_data(dvp, wccflag); 1580 nfsm_reqdone; 1581 VTONFS(dvp)->n_flag |= NMODIFIED; 1582 if (!wccflag) 1583 VTONFS(dvp)->n_attrstamp = 0; 1584 return (error); 1585 } 1586 1587 /* 1588 * nfs file rename call 1589 */ 1590 static int 1591 nfs_rename(ap) 1592 struct vop_rename_args /* { 1593 struct vnode *a_fdvp; 1594 struct vnode *a_fvp; 1595 struct componentname *a_fcnp; 1596 struct vnode *a_tdvp; 1597 struct vnode *a_tvp; 1598 struct componentname *a_tcnp; 1599 } */ *ap; 1600 { 1601 struct vnode *fvp = ap->a_fvp; 1602 struct vnode *tvp = ap->a_tvp; 1603 struct vnode *fdvp = ap->a_fdvp; 1604 struct vnode *tdvp = ap->a_tdvp; 1605 struct componentname *tcnp = ap->a_tcnp; 1606 struct componentname *fcnp = ap->a_fcnp; 1607 int error; 1608 1609 #ifndef DIAGNOSTIC 1610 if ((tcnp->cn_flags & HASBUF) == 0 || 1611 (fcnp->cn_flags & HASBUF) == 0) 1612 panic("nfs_rename: no name"); 1613 #endif 1614 /* Check for cross-device rename */ 1615 if ((fvp->v_mount != tdvp->v_mount) || 1616 (tvp && (fvp->v_mount != tvp->v_mount))) { 1617 error = EXDEV; 1618 goto out; 1619 } 1620 1621 /* 1622 * We have to flush B_DELWRI data prior to renaming 1623 * the file. If we don't, the delayed-write buffers 1624 * can be flushed out later after the file has gone stale 1625 * under NFSV3. NFSV2 does not have this problem because 1626 * ( as far as I can tell ) it flushes dirty buffers more 1627 * often. 1628 */ 1629 1630 VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_td); 1631 if (tvp) 1632 VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_td); 1633 1634 /* 1635 * If the tvp exists and is in use, sillyrename it before doing the 1636 * rename of the new file over it. 1637 * XXX Can't sillyrename a directory. 1638 */ 1639 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1640 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1641 vput(tvp); 1642 tvp = NULL; 1643 } 1644 1645 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1646 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1647 tcnp->cn_td); 1648 1649 if (fvp->v_type == VDIR) { 1650 if (tvp != NULL && tvp->v_type == VDIR) 1651 cache_purge(tdvp); 1652 cache_purge(fdvp); 1653 } 1654 1655 out: 1656 if (tdvp == tvp) 1657 vrele(tdvp); 1658 else 1659 vput(tdvp); 1660 if (tvp) 1661 vput(tvp); 1662 vrele(fdvp); 1663 vrele(fvp); 1664 /* 1665 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1666 */ 1667 if (error == ENOENT) 1668 error = 0; 1669 return (error); 1670 } 1671 1672 /* 1673 * nfs file rename rpc called from nfs_remove() above 1674 */ 1675 static int 1676 nfs_renameit(sdvp, scnp, sp) 1677 struct vnode *sdvp; 1678 struct componentname *scnp; 1679 struct sillyrename *sp; 1680 { 1681 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1682 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1683 } 1684 1685 /* 1686 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1687 */ 1688 static int 1689 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, td) 1690 struct vnode *fdvp; 1691 const char *fnameptr; 1692 int fnamelen; 1693 struct vnode *tdvp; 1694 const char *tnameptr; 1695 int tnamelen; 1696 struct ucred *cred; 1697 struct thread *td; 1698 { 1699 u_int32_t *tl; 1700 caddr_t cp; 1701 int32_t t1, t2; 1702 caddr_t bpos, dpos, cp2; 1703 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1704 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1705 int v3 = NFS_ISV3(fdvp); 1706 1707 nfsstats.rpccnt[NFSPROC_RENAME]++; 1708 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1709 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1710 nfsm_rndup(tnamelen)); 1711 nfsm_fhtom(fdvp, v3); 1712 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1713 nfsm_fhtom(tdvp, v3); 1714 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1715 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1716 if (v3) { 1717 nfsm_wcc_data(fdvp, fwccflag); 1718 nfsm_wcc_data(tdvp, twccflag); 1719 } 1720 nfsm_reqdone; 1721 VTONFS(fdvp)->n_flag |= NMODIFIED; 1722 VTONFS(tdvp)->n_flag |= NMODIFIED; 1723 if (!fwccflag) 1724 VTONFS(fdvp)->n_attrstamp = 0; 1725 if (!twccflag) 1726 VTONFS(tdvp)->n_attrstamp = 0; 1727 return (error); 1728 } 1729 1730 /* 1731 * nfs hard link create call 1732 */ 1733 static int 1734 nfs_link(ap) 1735 struct vop_link_args /* { 1736 struct vnode *a_tdvp; 1737 struct vnode *a_vp; 1738 struct componentname *a_cnp; 1739 } */ *ap; 1740 { 1741 struct vnode *vp = ap->a_vp; 1742 struct vnode *tdvp = ap->a_tdvp; 1743 struct componentname *cnp = ap->a_cnp; 1744 u_int32_t *tl; 1745 caddr_t cp; 1746 int32_t t1, t2; 1747 caddr_t bpos, dpos, cp2; 1748 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1749 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1750 int v3; 1751 1752 if (vp->v_mount != tdvp->v_mount) { 1753 return (EXDEV); 1754 } 1755 1756 /* 1757 * Push all writes to the server, so that the attribute cache 1758 * doesn't get "out of sync" with the server. 1759 * XXX There should be a better way! 1760 */ 1761 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_td); 1762 1763 v3 = NFS_ISV3(vp); 1764 nfsstats.rpccnt[NFSPROC_LINK]++; 1765 nfsm_reqhead(vp, NFSPROC_LINK, 1766 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1767 nfsm_fhtom(vp, v3); 1768 nfsm_fhtom(tdvp, v3); 1769 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1770 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1771 if (v3) { 1772 nfsm_postop_attr(vp, attrflag); 1773 nfsm_wcc_data(tdvp, wccflag); 1774 } 1775 nfsm_reqdone; 1776 VTONFS(tdvp)->n_flag |= NMODIFIED; 1777 if (!attrflag) 1778 VTONFS(vp)->n_attrstamp = 0; 1779 if (!wccflag) 1780 VTONFS(tdvp)->n_attrstamp = 0; 1781 /* 1782 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1783 */ 1784 if (error == EEXIST) 1785 error = 0; 1786 return (error); 1787 } 1788 1789 /* 1790 * nfs symbolic link create call 1791 */ 1792 static int 1793 nfs_symlink(ap) 1794 struct vop_symlink_args /* { 1795 struct vnode *a_dvp; 1796 struct vnode **a_vpp; 1797 struct componentname *a_cnp; 1798 struct vattr *a_vap; 1799 char *a_target; 1800 } */ *ap; 1801 { 1802 struct vnode *dvp = ap->a_dvp; 1803 struct vattr *vap = ap->a_vap; 1804 struct componentname *cnp = ap->a_cnp; 1805 struct nfsv2_sattr *sp; 1806 u_int32_t *tl; 1807 caddr_t cp; 1808 int32_t t1, t2; 1809 caddr_t bpos, dpos, cp2; 1810 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1811 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1812 struct vnode *newvp = (struct vnode *)0; 1813 int v3 = NFS_ISV3(dvp); 1814 1815 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1816 slen = strlen(ap->a_target); 1817 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1818 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1819 nfsm_fhtom(dvp, v3); 1820 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1821 if (v3) { 1822 nfsm_v3attrbuild(vap, FALSE); 1823 } 1824 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1825 if (!v3) { 1826 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1827 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1828 sp->sa_uid = nfs_xdrneg1; 1829 sp->sa_gid = nfs_xdrneg1; 1830 sp->sa_size = nfs_xdrneg1; 1831 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1832 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1833 } 1834 1835 /* 1836 * Issue the NFS request and get the rpc response. 1837 * 1838 * Only NFSv3 responses returning an error of 0 actually return 1839 * a file handle that can be converted into newvp without having 1840 * to do an extra lookup rpc. 1841 */ 1842 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1843 if (v3) { 1844 if (error == 0) 1845 nfsm_mtofh(dvp, newvp, v3, gotvp); 1846 nfsm_wcc_data(dvp, wccflag); 1847 } 1848 1849 /* 1850 * out code jumps -> here, mrep is also freed. 1851 */ 1852 1853 nfsm_reqdone; 1854 1855 /* 1856 * If we get an EEXIST error, silently convert it to no-error 1857 * in case of an NFS retry. 1858 */ 1859 if (error == EEXIST) 1860 error = 0; 1861 1862 /* 1863 * If we do not have (or no longer have) an error, and we could 1864 * not extract the newvp from the response due to the request being 1865 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1866 * to obtain a newvp to return. 1867 */ 1868 if (error == 0 && newvp == NULL) { 1869 struct nfsnode *np = NULL; 1870 1871 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1872 cnp->cn_cred, cnp->cn_td, &np); 1873 if (!error) 1874 newvp = NFSTOV(np); 1875 } 1876 if (error) { 1877 if (newvp) 1878 vput(newvp); 1879 } else { 1880 *ap->a_vpp = newvp; 1881 } 1882 VTONFS(dvp)->n_flag |= NMODIFIED; 1883 if (!wccflag) 1884 VTONFS(dvp)->n_attrstamp = 0; 1885 return (error); 1886 } 1887 1888 /* 1889 * nfs make dir call 1890 */ 1891 static int 1892 nfs_mkdir(ap) 1893 struct vop_mkdir_args /* { 1894 struct vnode *a_dvp; 1895 struct vnode **a_vpp; 1896 struct componentname *a_cnp; 1897 struct vattr *a_vap; 1898 } */ *ap; 1899 { 1900 struct vnode *dvp = ap->a_dvp; 1901 struct vattr *vap = ap->a_vap; 1902 struct componentname *cnp = ap->a_cnp; 1903 struct nfsv2_sattr *sp; 1904 u_int32_t *tl; 1905 caddr_t cp; 1906 int32_t t1, t2; 1907 int len; 1908 struct nfsnode *np = (struct nfsnode *)0; 1909 struct vnode *newvp = (struct vnode *)0; 1910 caddr_t bpos, dpos, cp2; 1911 int error = 0, wccflag = NFSV3_WCCRATTR; 1912 int gotvp = 0; 1913 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1914 struct vattr vattr; 1915 int v3 = NFS_ISV3(dvp); 1916 1917 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1918 return (error); 1919 } 1920 len = cnp->cn_namelen; 1921 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1922 nfsm_reqhead(dvp, NFSPROC_MKDIR, 1923 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1924 nfsm_fhtom(dvp, v3); 1925 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1926 if (v3) { 1927 nfsm_v3attrbuild(vap, FALSE); 1928 } else { 1929 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1930 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1931 sp->sa_uid = nfs_xdrneg1; 1932 sp->sa_gid = nfs_xdrneg1; 1933 sp->sa_size = nfs_xdrneg1; 1934 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1935 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1936 } 1937 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 1938 if (!error) 1939 nfsm_mtofh(dvp, newvp, v3, gotvp); 1940 if (v3) 1941 nfsm_wcc_data(dvp, wccflag); 1942 nfsm_reqdone; 1943 VTONFS(dvp)->n_flag |= NMODIFIED; 1944 if (!wccflag) 1945 VTONFS(dvp)->n_attrstamp = 0; 1946 /* 1947 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1948 * if we can succeed in looking up the directory. 1949 */ 1950 if (error == EEXIST || (!error && !gotvp)) { 1951 if (newvp) { 1952 vrele(newvp); 1953 newvp = (struct vnode *)0; 1954 } 1955 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1956 cnp->cn_td, &np); 1957 if (!error) { 1958 newvp = NFSTOV(np); 1959 if (newvp->v_type != VDIR) 1960 error = EEXIST; 1961 } 1962 } 1963 if (error) { 1964 if (newvp) 1965 vrele(newvp); 1966 } else 1967 *ap->a_vpp = newvp; 1968 return (error); 1969 } 1970 1971 /* 1972 * nfs remove directory call 1973 */ 1974 static int 1975 nfs_rmdir(ap) 1976 struct vop_rmdir_args /* { 1977 struct vnode *a_dvp; 1978 struct vnode *a_vp; 1979 struct componentname *a_cnp; 1980 } */ *ap; 1981 { 1982 struct vnode *vp = ap->a_vp; 1983 struct vnode *dvp = ap->a_dvp; 1984 struct componentname *cnp = ap->a_cnp; 1985 u_int32_t *tl; 1986 caddr_t cp; 1987 int32_t t1, t2; 1988 caddr_t bpos, dpos, cp2; 1989 int error = 0, wccflag = NFSV3_WCCRATTR; 1990 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1991 int v3 = NFS_ISV3(dvp); 1992 1993 if (dvp == vp) 1994 return (EINVAL); 1995 nfsstats.rpccnt[NFSPROC_RMDIR]++; 1996 nfsm_reqhead(dvp, NFSPROC_RMDIR, 1997 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1998 nfsm_fhtom(dvp, v3); 1999 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2000 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2001 if (v3) 2002 nfsm_wcc_data(dvp, wccflag); 2003 nfsm_reqdone; 2004 VTONFS(dvp)->n_flag |= NMODIFIED; 2005 if (!wccflag) 2006 VTONFS(dvp)->n_attrstamp = 0; 2007 cache_purge(dvp); 2008 cache_purge(vp); 2009 /* 2010 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2011 */ 2012 if (error == ENOENT) 2013 error = 0; 2014 return (error); 2015 } 2016 2017 /* 2018 * nfs readdir call 2019 */ 2020 static int 2021 nfs_readdir(ap) 2022 struct vop_readdir_args /* { 2023 struct vnode *a_vp; 2024 struct uio *a_uio; 2025 struct ucred *a_cred; 2026 } */ *ap; 2027 { 2028 struct vnode *vp = ap->a_vp; 2029 struct nfsnode *np = VTONFS(vp); 2030 struct uio *uio = ap->a_uio; 2031 int tresid, error; 2032 struct vattr vattr; 2033 2034 if (vp->v_type != VDIR) 2035 return (EPERM); 2036 /* 2037 * First, check for hit on the EOF offset cache 2038 */ 2039 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2040 (np->n_flag & NMODIFIED) == 0) { 2041 if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) { 2042 if (NQNFS_CKCACHABLE(vp, ND_READ)) { 2043 nfsstats.direofcache_hits++; 2044 return (0); 2045 } 2046 } else if (VOP_GETATTR(vp, &vattr, uio->uio_td) == 0 && 2047 np->n_mtime == vattr.va_mtime.tv_sec) { 2048 nfsstats.direofcache_hits++; 2049 return (0); 2050 } 2051 } 2052 2053 /* 2054 * Call nfs_bioread() to do the real work. 2055 */ 2056 tresid = uio->uio_resid; 2057 error = nfs_bioread(vp, uio, 0); 2058 2059 if (!error && uio->uio_resid == tresid) 2060 nfsstats.direofcache_misses++; 2061 return (error); 2062 } 2063 2064 /* 2065 * Readdir rpc call. 2066 * Called from below the buffer cache by nfs_doio(). 2067 */ 2068 int 2069 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2070 { 2071 int len, left; 2072 struct dirent *dp = NULL; 2073 u_int32_t *tl; 2074 caddr_t cp; 2075 int32_t t1, t2; 2076 nfsuint64 *cookiep; 2077 caddr_t bpos, dpos, cp2; 2078 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2079 nfsuint64 cookie; 2080 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2081 struct nfsnode *dnp = VTONFS(vp); 2082 u_quad_t fileno; 2083 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2084 int attrflag; 2085 int v3 = NFS_ISV3(vp); 2086 2087 #ifndef DIAGNOSTIC 2088 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2089 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2090 panic("nfs readdirrpc bad uio"); 2091 #endif 2092 2093 /* 2094 * If there is no cookie, assume directory was stale. 2095 */ 2096 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2097 if (cookiep) 2098 cookie = *cookiep; 2099 else 2100 return (NFSERR_BAD_COOKIE); 2101 /* 2102 * Loop around doing readdir rpc's of size nm_readdirsize 2103 * truncated to a multiple of DIRBLKSIZ. 2104 * The stopping criteria is EOF or buffer full. 2105 */ 2106 while (more_dirs && bigenough) { 2107 nfsstats.rpccnt[NFSPROC_READDIR]++; 2108 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2109 NFSX_READDIR(v3)); 2110 nfsm_fhtom(vp, v3); 2111 if (v3) { 2112 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2113 *tl++ = cookie.nfsuquad[0]; 2114 *tl++ = cookie.nfsuquad[1]; 2115 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2116 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2117 } else { 2118 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2119 *tl++ = cookie.nfsuquad[0]; 2120 } 2121 *tl = txdr_unsigned(nmp->nm_readdirsize); 2122 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, NFSVPCRED(vp)); 2123 if (v3) { 2124 nfsm_postop_attr(vp, attrflag); 2125 if (!error) { 2126 nfsm_dissect(tl, u_int32_t *, 2127 2 * NFSX_UNSIGNED); 2128 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2129 dnp->n_cookieverf.nfsuquad[1] = *tl; 2130 } else { 2131 m_freem(mrep); 2132 goto nfsmout; 2133 } 2134 } 2135 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2136 more_dirs = fxdr_unsigned(int, *tl); 2137 2138 /* loop thru the dir entries, doctoring them to 4bsd form */ 2139 while (more_dirs && bigenough) { 2140 if (v3) { 2141 nfsm_dissect(tl, u_int32_t *, 2142 3 * NFSX_UNSIGNED); 2143 fileno = fxdr_hyper(tl); 2144 len = fxdr_unsigned(int, *(tl + 2)); 2145 } else { 2146 nfsm_dissect(tl, u_int32_t *, 2147 2 * NFSX_UNSIGNED); 2148 fileno = fxdr_unsigned(u_quad_t, *tl++); 2149 len = fxdr_unsigned(int, *tl); 2150 } 2151 if (len <= 0 || len > NFS_MAXNAMLEN) { 2152 error = EBADRPC; 2153 m_freem(mrep); 2154 goto nfsmout; 2155 } 2156 tlen = nfsm_rndup(len); 2157 if (tlen == len) 2158 tlen += 4; /* To ensure null termination */ 2159 left = DIRBLKSIZ - blksiz; 2160 if ((tlen + DIRHDSIZ) > left) { 2161 dp->d_reclen += left; 2162 uiop->uio_iov->iov_base += left; 2163 uiop->uio_iov->iov_len -= left; 2164 uiop->uio_offset += left; 2165 uiop->uio_resid -= left; 2166 blksiz = 0; 2167 } 2168 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2169 bigenough = 0; 2170 if (bigenough) { 2171 dp = (struct dirent *)uiop->uio_iov->iov_base; 2172 dp->d_fileno = (int)fileno; 2173 dp->d_namlen = len; 2174 dp->d_reclen = tlen + DIRHDSIZ; 2175 dp->d_type = DT_UNKNOWN; 2176 blksiz += dp->d_reclen; 2177 if (blksiz == DIRBLKSIZ) 2178 blksiz = 0; 2179 uiop->uio_offset += DIRHDSIZ; 2180 uiop->uio_resid -= DIRHDSIZ; 2181 uiop->uio_iov->iov_base += DIRHDSIZ; 2182 uiop->uio_iov->iov_len -= DIRHDSIZ; 2183 nfsm_mtouio(uiop, len); 2184 cp = uiop->uio_iov->iov_base; 2185 tlen -= len; 2186 *cp = '\0'; /* null terminate */ 2187 uiop->uio_iov->iov_base += tlen; 2188 uiop->uio_iov->iov_len -= tlen; 2189 uiop->uio_offset += tlen; 2190 uiop->uio_resid -= tlen; 2191 } else 2192 nfsm_adv(nfsm_rndup(len)); 2193 if (v3) { 2194 nfsm_dissect(tl, u_int32_t *, 2195 3 * NFSX_UNSIGNED); 2196 } else { 2197 nfsm_dissect(tl, u_int32_t *, 2198 2 * NFSX_UNSIGNED); 2199 } 2200 if (bigenough) { 2201 cookie.nfsuquad[0] = *tl++; 2202 if (v3) 2203 cookie.nfsuquad[1] = *tl++; 2204 } else if (v3) 2205 tl += 2; 2206 else 2207 tl++; 2208 more_dirs = fxdr_unsigned(int, *tl); 2209 } 2210 /* 2211 * If at end of rpc data, get the eof boolean 2212 */ 2213 if (!more_dirs) { 2214 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2215 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2216 } 2217 m_freem(mrep); 2218 } 2219 /* 2220 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2221 * by increasing d_reclen for the last record. 2222 */ 2223 if (blksiz > 0) { 2224 left = DIRBLKSIZ - blksiz; 2225 dp->d_reclen += left; 2226 uiop->uio_iov->iov_base += left; 2227 uiop->uio_iov->iov_len -= left; 2228 uiop->uio_offset += left; 2229 uiop->uio_resid -= left; 2230 } 2231 2232 /* 2233 * We are now either at the end of the directory or have filled the 2234 * block. 2235 */ 2236 if (bigenough) 2237 dnp->n_direofoffset = uiop->uio_offset; 2238 else { 2239 if (uiop->uio_resid > 0) 2240 printf("EEK! readdirrpc resid > 0\n"); 2241 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2242 *cookiep = cookie; 2243 } 2244 nfsmout: 2245 return (error); 2246 } 2247 2248 /* 2249 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2250 */ 2251 int 2252 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2253 { 2254 int len, left; 2255 struct dirent *dp; 2256 u_int32_t *tl; 2257 caddr_t cp; 2258 int32_t t1, t2; 2259 struct vnode *newvp; 2260 nfsuint64 *cookiep; 2261 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2262 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2263 struct nameidata nami, *ndp = &nami; 2264 struct componentname *cnp = &ndp->ni_cnd; 2265 nfsuint64 cookie; 2266 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2267 struct nfsnode *dnp = VTONFS(vp), *np; 2268 nfsfh_t *fhp; 2269 u_quad_t fileno; 2270 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2271 int attrflag, fhsize; 2272 2273 #ifndef nolint 2274 dp = (struct dirent *)0; 2275 #endif 2276 #ifndef DIAGNOSTIC 2277 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2278 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2279 panic("nfs readdirplusrpc bad uio"); 2280 #endif 2281 ndp->ni_dvp = vp; 2282 newvp = NULLVP; 2283 2284 /* 2285 * If there is no cookie, assume directory was stale. 2286 */ 2287 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2288 if (cookiep) 2289 cookie = *cookiep; 2290 else 2291 return (NFSERR_BAD_COOKIE); 2292 /* 2293 * Loop around doing readdir rpc's of size nm_readdirsize 2294 * truncated to a multiple of DIRBLKSIZ. 2295 * The stopping criteria is EOF or buffer full. 2296 */ 2297 while (more_dirs && bigenough) { 2298 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2299 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2300 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2301 nfsm_fhtom(vp, 1); 2302 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2303 *tl++ = cookie.nfsuquad[0]; 2304 *tl++ = cookie.nfsuquad[1]; 2305 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2306 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2307 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2308 *tl = txdr_unsigned(nmp->nm_rsize); 2309 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, NFSVPCRED(vp)); 2310 nfsm_postop_attr(vp, attrflag); 2311 if (error) { 2312 m_freem(mrep); 2313 goto nfsmout; 2314 } 2315 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2316 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2317 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2318 more_dirs = fxdr_unsigned(int, *tl); 2319 2320 /* loop thru the dir entries, doctoring them to 4bsd form */ 2321 while (more_dirs && bigenough) { 2322 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2323 fileno = fxdr_hyper(tl); 2324 len = fxdr_unsigned(int, *(tl + 2)); 2325 if (len <= 0 || len > NFS_MAXNAMLEN) { 2326 error = EBADRPC; 2327 m_freem(mrep); 2328 goto nfsmout; 2329 } 2330 tlen = nfsm_rndup(len); 2331 if (tlen == len) 2332 tlen += 4; /* To ensure null termination*/ 2333 left = DIRBLKSIZ - blksiz; 2334 if ((tlen + DIRHDSIZ) > left) { 2335 dp->d_reclen += left; 2336 uiop->uio_iov->iov_base += left; 2337 uiop->uio_iov->iov_len -= left; 2338 uiop->uio_offset += left; 2339 uiop->uio_resid -= left; 2340 blksiz = 0; 2341 } 2342 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2343 bigenough = 0; 2344 if (bigenough) { 2345 dp = (struct dirent *)uiop->uio_iov->iov_base; 2346 dp->d_fileno = (int)fileno; 2347 dp->d_namlen = len; 2348 dp->d_reclen = tlen + DIRHDSIZ; 2349 dp->d_type = DT_UNKNOWN; 2350 blksiz += dp->d_reclen; 2351 if (blksiz == DIRBLKSIZ) 2352 blksiz = 0; 2353 uiop->uio_offset += DIRHDSIZ; 2354 uiop->uio_resid -= DIRHDSIZ; 2355 uiop->uio_iov->iov_base += DIRHDSIZ; 2356 uiop->uio_iov->iov_len -= DIRHDSIZ; 2357 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2358 cnp->cn_namelen = len; 2359 nfsm_mtouio(uiop, len); 2360 cp = uiop->uio_iov->iov_base; 2361 tlen -= len; 2362 *cp = '\0'; 2363 uiop->uio_iov->iov_base += tlen; 2364 uiop->uio_iov->iov_len -= tlen; 2365 uiop->uio_offset += tlen; 2366 uiop->uio_resid -= tlen; 2367 } else 2368 nfsm_adv(nfsm_rndup(len)); 2369 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2370 if (bigenough) { 2371 cookie.nfsuquad[0] = *tl++; 2372 cookie.nfsuquad[1] = *tl++; 2373 } else 2374 tl += 2; 2375 2376 /* 2377 * Since the attributes are before the file handle 2378 * (sigh), we must skip over the attributes and then 2379 * come back and get them. 2380 */ 2381 attrflag = fxdr_unsigned(int, *tl); 2382 if (attrflag) { 2383 dpossav1 = dpos; 2384 mdsav1 = md; 2385 nfsm_adv(NFSX_V3FATTR); 2386 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2387 doit = fxdr_unsigned(int, *tl); 2388 if (doit) { 2389 nfsm_getfh(fhp, fhsize, 1); 2390 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2391 VREF(vp); 2392 newvp = vp; 2393 np = dnp; 2394 } else { 2395 error = nfs_nget(vp->v_mount, fhp, 2396 fhsize, &np); 2397 if (error) 2398 doit = 0; 2399 else 2400 newvp = NFSTOV(np); 2401 } 2402 } 2403 if (doit && bigenough) { 2404 dpossav2 = dpos; 2405 dpos = dpossav1; 2406 mdsav2 = md; 2407 md = mdsav1; 2408 nfsm_loadattr(newvp, (struct vattr *)0); 2409 dpos = dpossav2; 2410 md = mdsav2; 2411 dp->d_type = 2412 IFTODT(VTTOIF(np->n_vattr.va_type)); 2413 ndp->ni_vp = newvp; 2414 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2415 } 2416 } else { 2417 /* Just skip over the file handle */ 2418 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2419 i = fxdr_unsigned(int, *tl); 2420 nfsm_adv(nfsm_rndup(i)); 2421 } 2422 if (newvp != NULLVP) { 2423 if (newvp == vp) 2424 vrele(newvp); 2425 else 2426 vput(newvp); 2427 newvp = NULLVP; 2428 } 2429 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2430 more_dirs = fxdr_unsigned(int, *tl); 2431 } 2432 /* 2433 * If at end of rpc data, get the eof boolean 2434 */ 2435 if (!more_dirs) { 2436 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2437 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2438 } 2439 m_freem(mrep); 2440 } 2441 /* 2442 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2443 * by increasing d_reclen for the last record. 2444 */ 2445 if (blksiz > 0) { 2446 left = DIRBLKSIZ - blksiz; 2447 dp->d_reclen += left; 2448 uiop->uio_iov->iov_base += left; 2449 uiop->uio_iov->iov_len -= left; 2450 uiop->uio_offset += left; 2451 uiop->uio_resid -= left; 2452 } 2453 2454 /* 2455 * We are now either at the end of the directory or have filled the 2456 * block. 2457 */ 2458 if (bigenough) 2459 dnp->n_direofoffset = uiop->uio_offset; 2460 else { 2461 if (uiop->uio_resid > 0) 2462 printf("EEK! readdirplusrpc resid > 0\n"); 2463 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2464 *cookiep = cookie; 2465 } 2466 nfsmout: 2467 if (newvp != NULLVP) { 2468 if (newvp == vp) 2469 vrele(newvp); 2470 else 2471 vput(newvp); 2472 newvp = NULLVP; 2473 } 2474 return (error); 2475 } 2476 2477 /* 2478 * Silly rename. To make the NFS filesystem that is stateless look a little 2479 * more like the "ufs" a remove of an active vnode is translated to a rename 2480 * to a funny looking filename that is removed by nfs_inactive on the 2481 * nfsnode. There is the potential for another process on a different client 2482 * to create the same funny name between the nfs_lookitup() fails and the 2483 * nfs_rename() completes, but... 2484 */ 2485 static int 2486 nfs_sillyrename(dvp, vp, cnp) 2487 struct vnode *dvp, *vp; 2488 struct componentname *cnp; 2489 { 2490 struct sillyrename *sp; 2491 struct nfsnode *np; 2492 int error; 2493 2494 cache_purge(dvp); 2495 np = VTONFS(vp); 2496 #ifndef DIAGNOSTIC 2497 if (vp->v_type == VDIR) 2498 panic("nfs: sillyrename dir"); 2499 #endif 2500 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2501 M_NFSREQ, M_WAITOK); 2502 sp->s_cred = crdup(cnp->cn_cred); 2503 sp->s_dvp = dvp; 2504 VREF(dvp); 2505 2506 /* Fudge together a funny name */ 2507 sp->s_namlen = sprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2508 2509 /* Try lookitups until we get one that isn't there */ 2510 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2511 cnp->cn_td, (struct nfsnode **)0) == 0) { 2512 sp->s_name[4]++; 2513 if (sp->s_name[4] > 'z') { 2514 error = EINVAL; 2515 goto bad; 2516 } 2517 } 2518 error = nfs_renameit(dvp, cnp, sp); 2519 if (error) 2520 goto bad; 2521 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2522 cnp->cn_td, &np); 2523 np->n_sillyrename = sp; 2524 return (0); 2525 bad: 2526 vrele(sp->s_dvp); 2527 crfree(sp->s_cred); 2528 free((caddr_t)sp, M_NFSREQ); 2529 return (error); 2530 } 2531 2532 /* 2533 * Look up a file name and optionally either update the file handle or 2534 * allocate an nfsnode, depending on the value of npp. 2535 * npp == NULL --> just do the lookup 2536 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2537 * handled too 2538 * *npp != NULL --> update the file handle in the vnode 2539 */ 2540 static int 2541 nfs_lookitup(dvp, name, len, cred, td, npp) 2542 struct vnode *dvp; 2543 const char *name; 2544 int len; 2545 struct ucred *cred; 2546 struct thread *td; 2547 struct nfsnode **npp; 2548 { 2549 u_int32_t *tl; 2550 caddr_t cp; 2551 int32_t t1, t2; 2552 struct vnode *newvp = (struct vnode *)0; 2553 struct nfsnode *np, *dnp = VTONFS(dvp); 2554 caddr_t bpos, dpos, cp2; 2555 int error = 0, fhlen, attrflag; 2556 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2557 nfsfh_t *nfhp; 2558 int v3 = NFS_ISV3(dvp); 2559 2560 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2561 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2562 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2563 nfsm_fhtom(dvp, v3); 2564 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2565 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2566 if (npp && !error) { 2567 nfsm_getfh(nfhp, fhlen, v3); 2568 if (*npp) { 2569 np = *npp; 2570 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2571 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2572 np->n_fhp = &np->n_fh; 2573 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2574 np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); 2575 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2576 np->n_fhsize = fhlen; 2577 newvp = NFSTOV(np); 2578 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2579 VREF(dvp); 2580 newvp = dvp; 2581 } else { 2582 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2583 if (error) { 2584 m_freem(mrep); 2585 return (error); 2586 } 2587 newvp = NFSTOV(np); 2588 } 2589 if (v3) { 2590 nfsm_postop_attr(newvp, attrflag); 2591 if (!attrflag && *npp == NULL) { 2592 m_freem(mrep); 2593 if (newvp == dvp) 2594 vrele(newvp); 2595 else 2596 vput(newvp); 2597 return (ENOENT); 2598 } 2599 } else 2600 nfsm_loadattr(newvp, (struct vattr *)0); 2601 } 2602 nfsm_reqdone; 2603 if (npp && *npp == NULL) { 2604 if (error) { 2605 if (newvp) { 2606 if (newvp == dvp) 2607 vrele(newvp); 2608 else 2609 vput(newvp); 2610 } 2611 } else 2612 *npp = np; 2613 } 2614 return (error); 2615 } 2616 2617 /* 2618 * Nfs Version 3 commit rpc 2619 */ 2620 int 2621 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2622 { 2623 caddr_t cp; 2624 u_int32_t *tl; 2625 int32_t t1, t2; 2626 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2627 caddr_t bpos, dpos, cp2; 2628 int error = 0, wccflag = NFSV3_WCCRATTR; 2629 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2630 2631 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2632 return (0); 2633 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2634 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2635 nfsm_fhtom(vp, 1); 2636 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2637 txdr_hyper(offset, tl); 2638 tl += 2; 2639 *tl = txdr_unsigned(cnt); 2640 nfsm_request(vp, NFSPROC_COMMIT, td, NFSVPCRED(vp)); 2641 nfsm_wcc_data(vp, wccflag); 2642 if (!error) { 2643 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2644 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2645 NFSX_V3WRITEVERF)) { 2646 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2647 NFSX_V3WRITEVERF); 2648 error = NFSERR_STALEWRITEVERF; 2649 } 2650 } 2651 nfsm_reqdone; 2652 return (error); 2653 } 2654 2655 /* 2656 * Kludge City.. 2657 * - make nfs_bmap() essentially a no-op that does no translation 2658 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2659 * (Maybe I could use the process's page mapping, but I was concerned that 2660 * Kernel Write might not be enabled and also figured copyout() would do 2661 * a lot more work than bcopy() and also it currently happens in the 2662 * context of the swapper process (2). 2663 */ 2664 static int 2665 nfs_bmap(ap) 2666 struct vop_bmap_args /* { 2667 struct vnode *a_vp; 2668 daddr_t a_bn; 2669 struct vnode **a_vpp; 2670 daddr_t *a_bnp; 2671 int *a_runp; 2672 int *a_runb; 2673 } */ *ap; 2674 { 2675 struct vnode *vp = ap->a_vp; 2676 2677 if (ap->a_vpp != NULL) 2678 *ap->a_vpp = vp; 2679 if (ap->a_bnp != NULL) 2680 *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize); 2681 if (ap->a_runp != NULL) 2682 *ap->a_runp = 0; 2683 if (ap->a_runb != NULL) 2684 *ap->a_runb = 0; 2685 return (0); 2686 } 2687 2688 /* 2689 * Strategy routine. 2690 * For async requests when nfsiod(s) are running, queue the request by 2691 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2692 * request. 2693 */ 2694 static int 2695 nfs_strategy(ap) 2696 struct vop_strategy_args *ap; 2697 { 2698 struct buf *bp = ap->a_bp; 2699 struct thread *td; 2700 int error = 0; 2701 2702 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2703 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2704 2705 if (bp->b_flags & B_PHYS) 2706 panic("nfs physio"); 2707 2708 if (bp->b_flags & B_ASYNC) 2709 td = NULL; 2710 else 2711 td = curthread; /* XXX */ 2712 2713 /* 2714 * If the op is asynchronous and an i/o daemon is waiting 2715 * queue the request, wake it up and wait for completion 2716 * otherwise just do it ourselves. 2717 */ 2718 if ((bp->b_flags & B_ASYNC) == 0 || 2719 nfs_asyncio(bp, td)) 2720 error = nfs_doio(bp, td); 2721 return (error); 2722 } 2723 2724 /* 2725 * Mmap a file 2726 * 2727 * NB Currently unsupported. 2728 */ 2729 /* ARGSUSED */ 2730 static int 2731 nfs_mmap(ap) 2732 struct vop_mmap_args /* { 2733 struct vnode *a_vp; 2734 int a_fflags; 2735 struct ucred *a_cred; 2736 struct thread *a_td; 2737 } */ *ap; 2738 { 2739 2740 return (EINVAL); 2741 } 2742 2743 /* 2744 * fsync vnode op. Just call nfs_flush() with commit == 1. 2745 */ 2746 /* ARGSUSED */ 2747 static int 2748 nfs_fsync(ap) 2749 struct vop_fsync_args /* { 2750 struct vnodeop_desc *a_desc; 2751 struct vnode * a_vp; 2752 struct ucred * a_cred; 2753 int a_waitfor; 2754 struct thread * a_td; 2755 } */ *ap; 2756 { 2757 2758 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2759 } 2760 2761 /* 2762 * Flush all the blocks associated with a vnode. 2763 * Walk through the buffer pool and push any dirty pages 2764 * associated with the vnode. 2765 */ 2766 static int 2767 nfs_flush(vp, waitfor, td, commit) 2768 struct vnode *vp; 2769 int waitfor; 2770 struct thread *td; 2771 int commit; 2772 { 2773 struct nfsnode *np = VTONFS(vp); 2774 struct buf *bp; 2775 int i; 2776 struct buf *nbp; 2777 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2778 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2779 int passone = 1; 2780 u_quad_t off, endoff, toff; 2781 struct buf **bvec = NULL; 2782 #ifndef NFS_COMMITBVECSIZ 2783 #define NFS_COMMITBVECSIZ 20 2784 #endif 2785 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2786 int bvecsize = 0, bveccount; 2787 2788 if (nmp->nm_flag & NFSMNT_INT) 2789 slpflag = PCATCH; 2790 if (!commit) 2791 passone = 0; 2792 /* 2793 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2794 * server, but nas not been committed to stable storage on the server 2795 * yet. On the first pass, the byte range is worked out and the commit 2796 * rpc is done. On the second pass, nfs_writebp() is called to do the 2797 * job. 2798 */ 2799 again: 2800 off = (u_quad_t)-1; 2801 endoff = 0; 2802 bvecpos = 0; 2803 if (NFS_ISV3(vp) && commit) { 2804 s = splbio(); 2805 /* 2806 * Count up how many buffers waiting for a commit. 2807 */ 2808 bveccount = 0; 2809 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2810 nbp = TAILQ_NEXT(bp, b_vnbufs); 2811 if (BUF_REFCNT(bp) == 0 && 2812 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2813 == (B_DELWRI | B_NEEDCOMMIT)) 2814 bveccount++; 2815 } 2816 /* 2817 * Allocate space to remember the list of bufs to commit. It is 2818 * important to use M_NOWAIT here to avoid a race with nfs_write. 2819 * If we can't get memory (for whatever reason), we will end up 2820 * committing the buffers one-by-one in the loop below. 2821 */ 2822 if (bvec != NULL && bvec != bvec_on_stack) 2823 free(bvec, M_TEMP); 2824 if (bveccount > NFS_COMMITBVECSIZ) { 2825 bvec = (struct buf **) 2826 malloc(bveccount * sizeof(struct buf *), 2827 M_TEMP, M_NOWAIT); 2828 if (bvec == NULL) { 2829 bvec = bvec_on_stack; 2830 bvecsize = NFS_COMMITBVECSIZ; 2831 } else 2832 bvecsize = bveccount; 2833 } else { 2834 bvec = bvec_on_stack; 2835 bvecsize = NFS_COMMITBVECSIZ; 2836 } 2837 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2838 nbp = TAILQ_NEXT(bp, b_vnbufs); 2839 if (bvecpos >= bvecsize) 2840 break; 2841 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2842 (B_DELWRI | B_NEEDCOMMIT) || 2843 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 2844 continue; 2845 bremfree(bp); 2846 /* 2847 * NOTE: we are not clearing B_DONE here, so we have 2848 * to do it later on in this routine if we intend to 2849 * initiate I/O on the bp. 2850 * 2851 * Note: to avoid loopback deadlocks, we do not 2852 * assign b_runningbufspace. 2853 */ 2854 bp->b_flags |= B_WRITEINPROG; 2855 vfs_busy_pages(bp, 1); 2856 2857 /* 2858 * bp is protected by being locked, but nbp is not 2859 * and vfs_busy_pages() may sleep. We have to 2860 * recalculate nbp. 2861 */ 2862 nbp = TAILQ_NEXT(bp, b_vnbufs); 2863 2864 /* 2865 * A list of these buffers is kept so that the 2866 * second loop knows which buffers have actually 2867 * been committed. This is necessary, since there 2868 * may be a race between the commit rpc and new 2869 * uncommitted writes on the file. 2870 */ 2871 bvec[bvecpos++] = bp; 2872 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2873 bp->b_dirtyoff; 2874 if (toff < off) 2875 off = toff; 2876 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2877 if (toff > endoff) 2878 endoff = toff; 2879 } 2880 splx(s); 2881 } 2882 if (bvecpos > 0) { 2883 /* 2884 * Commit data on the server, as required. Note that 2885 * nfs_commit will use the vnode's cred for the commit. 2886 */ 2887 retv = nfs_commit(vp, off, (int)(endoff - off), td); 2888 2889 if (retv == NFSERR_STALEWRITEVERF) 2890 nfs_clearcommit(vp->v_mount); 2891 2892 /* 2893 * Now, either mark the blocks I/O done or mark the 2894 * blocks dirty, depending on whether the commit 2895 * succeeded. 2896 */ 2897 for (i = 0; i < bvecpos; i++) { 2898 bp = bvec[i]; 2899 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2900 if (retv) { 2901 /* 2902 * Error, leave B_DELWRI intact 2903 */ 2904 vfs_unbusy_pages(bp); 2905 brelse(bp); 2906 } else { 2907 /* 2908 * Success, remove B_DELWRI ( bundirty() ). 2909 * 2910 * b_dirtyoff/b_dirtyend seem to be NFS 2911 * specific. We should probably move that 2912 * into bundirty(). XXX 2913 */ 2914 s = splbio(); 2915 vp->v_numoutput++; 2916 bp->b_flags |= B_ASYNC; 2917 bundirty(bp); 2918 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 2919 bp->b_dirtyoff = bp->b_dirtyend = 0; 2920 splx(s); 2921 biodone(bp); 2922 } 2923 } 2924 } 2925 2926 /* 2927 * Start/do any write(s) that are required. 2928 */ 2929 loop: 2930 s = splbio(); 2931 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2932 nbp = TAILQ_NEXT(bp, b_vnbufs); 2933 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 2934 if (waitfor != MNT_WAIT || passone) 2935 continue; 2936 error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL, 2937 "nfsfsync", slpflag, slptimeo); 2938 splx(s); 2939 if (error == 0) 2940 panic("nfs_fsync: inconsistent lock"); 2941 if (error == ENOLCK) 2942 goto loop; 2943 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2944 error = EINTR; 2945 goto done; 2946 } 2947 if (slpflag == PCATCH) { 2948 slpflag = 0; 2949 slptimeo = 2 * hz; 2950 } 2951 goto loop; 2952 } 2953 if ((bp->b_flags & B_DELWRI) == 0) 2954 panic("nfs_fsync: not dirty"); 2955 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2956 BUF_UNLOCK(bp); 2957 continue; 2958 } 2959 bremfree(bp); 2960 if (passone || !commit) 2961 bp->b_flags |= B_ASYNC; 2962 else 2963 bp->b_flags |= B_ASYNC | B_WRITEINPROG; 2964 splx(s); 2965 VOP_BWRITE(bp->b_vp, bp); 2966 goto loop; 2967 } 2968 splx(s); 2969 if (passone) { 2970 passone = 0; 2971 goto again; 2972 } 2973 if (waitfor == MNT_WAIT) { 2974 while (vp->v_numoutput) { 2975 vp->v_flag |= VBWAIT; 2976 error = tsleep((caddr_t)&vp->v_numoutput, 2977 slpflag, "nfsfsync", slptimeo); 2978 if (error) { 2979 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2980 error = EINTR; 2981 goto done; 2982 } 2983 if (slpflag == PCATCH) { 2984 slpflag = 0; 2985 slptimeo = 2 * hz; 2986 } 2987 } 2988 } 2989 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 2990 goto loop; 2991 } 2992 } 2993 if (np->n_flag & NWRITEERR) { 2994 error = np->n_error; 2995 np->n_flag &= ~NWRITEERR; 2996 } 2997 done: 2998 if (bvec != NULL && bvec != bvec_on_stack) 2999 free(bvec, M_TEMP); 3000 return (error); 3001 } 3002 3003 /* 3004 * NFS advisory byte-level locks. 3005 * Currently unsupported. 3006 */ 3007 static int 3008 nfs_advlock(ap) 3009 struct vop_advlock_args /* { 3010 struct vnode *a_vp; 3011 caddr_t a_id; 3012 int a_op; 3013 struct flock *a_fl; 3014 int a_flags; 3015 } */ *ap; 3016 { 3017 struct nfsnode *np = VTONFS(ap->a_vp); 3018 3019 /* 3020 * The following kludge is to allow diskless support to work 3021 * until a real NFS lockd is implemented. Basically, just pretend 3022 * that this is a local lock. 3023 */ 3024 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3025 } 3026 3027 /* 3028 * Print out the contents of an nfsnode. 3029 */ 3030 static int 3031 nfs_print(ap) 3032 struct vop_print_args /* { 3033 struct vnode *a_vp; 3034 } */ *ap; 3035 { 3036 struct vnode *vp = ap->a_vp; 3037 struct nfsnode *np = VTONFS(vp); 3038 3039 printf("tag VT_NFS, fileid %ld fsid 0x%x", 3040 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3041 if (vp->v_type == VFIFO) 3042 fifo_printinfo(vp); 3043 printf("\n"); 3044 return (0); 3045 } 3046 3047 /* 3048 * Just call nfs_writebp() with the force argument set to 1. 3049 * 3050 * NOTE: B_DONE may or may not be set in a_bp on call. 3051 */ 3052 static int 3053 nfs_bwrite(ap) 3054 struct vop_bwrite_args /* { 3055 struct vnode *a_bp; 3056 } */ *ap; 3057 { 3058 return (nfs_writebp(ap->a_bp, 1, curthread)); 3059 } 3060 3061 /* 3062 * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless 3063 * the force flag is one and it also handles the B_NEEDCOMMIT flag. We set 3064 * B_CACHE if this is a VMIO buffer. 3065 */ 3066 int 3067 nfs_writebp(bp, force, td) 3068 struct buf *bp; 3069 int force; 3070 struct thread *td; 3071 { 3072 int s; 3073 int oldflags = bp->b_flags; 3074 #if 0 3075 int retv = 1; 3076 off_t off; 3077 #endif 3078 3079 if (BUF_REFCNT(bp) == 0) 3080 panic("bwrite: buffer is not locked???"); 3081 3082 if (bp->b_flags & B_INVAL) { 3083 brelse(bp); 3084 return(0); 3085 } 3086 3087 bp->b_flags |= B_CACHE; 3088 3089 /* 3090 * Undirty the bp. We will redirty it later if the I/O fails. 3091 */ 3092 3093 s = splbio(); 3094 bundirty(bp); 3095 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 3096 3097 bp->b_vp->v_numoutput++; 3098 splx(s); 3099 3100 /* 3101 * Note: to avoid loopback deadlocks, we do not 3102 * assign b_runningbufspace. 3103 */ 3104 vfs_busy_pages(bp, 1); 3105 3106 if (force) 3107 bp->b_flags |= B_WRITEINPROG; 3108 BUF_KERNPROC(bp); 3109 VOP_STRATEGY(bp->b_vp, bp); 3110 3111 if( (oldflags & B_ASYNC) == 0) { 3112 int rtval = biowait(bp); 3113 3114 if (oldflags & B_DELWRI) { 3115 s = splbio(); 3116 reassignbuf(bp, bp->b_vp); 3117 splx(s); 3118 } 3119 3120 brelse(bp); 3121 return (rtval); 3122 } 3123 3124 return (0); 3125 } 3126 3127 /* 3128 * nfs special file access vnode op. 3129 * Essentially just get vattr and then imitate iaccess() since the device is 3130 * local to the client. 3131 */ 3132 static int 3133 nfsspec_access(ap) 3134 struct vop_access_args /* { 3135 struct vnode *a_vp; 3136 int a_mode; 3137 struct ucred *a_cred; 3138 struct thread *a_td; 3139 } */ *ap; 3140 { 3141 struct vattr *vap; 3142 gid_t *gp; 3143 struct ucred *cred = ap->a_cred; 3144 struct vnode *vp = ap->a_vp; 3145 mode_t mode = ap->a_mode; 3146 struct vattr vattr; 3147 int i; 3148 int error; 3149 3150 /* 3151 * Disallow write attempts on filesystems mounted read-only; 3152 * unless the file is a socket, fifo, or a block or character 3153 * device resident on the filesystem. 3154 */ 3155 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3156 switch (vp->v_type) { 3157 case VREG: 3158 case VDIR: 3159 case VLNK: 3160 return (EROFS); 3161 default: 3162 break; 3163 } 3164 } 3165 /* 3166 * If you're the super-user, 3167 * you always get access. 3168 */ 3169 if (cred->cr_uid == 0) 3170 return (0); 3171 vap = &vattr; 3172 error = VOP_GETATTR(vp, vap, ap->a_td); 3173 if (error) 3174 return (error); 3175 /* 3176 * Access check is based on only one of owner, group, public. 3177 * If not owner, then check group. If not a member of the 3178 * group, then check public access. 3179 */ 3180 if (cred->cr_uid != vap->va_uid) { 3181 mode >>= 3; 3182 gp = cred->cr_groups; 3183 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3184 if (vap->va_gid == *gp) 3185 goto found; 3186 mode >>= 3; 3187 found: 3188 ; 3189 } 3190 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3191 return (error); 3192 } 3193 3194 /* 3195 * Read wrapper for special devices. 3196 */ 3197 static int 3198 nfsspec_read(ap) 3199 struct vop_read_args /* { 3200 struct vnode *a_vp; 3201 struct uio *a_uio; 3202 int a_ioflag; 3203 struct ucred *a_cred; 3204 } */ *ap; 3205 { 3206 struct nfsnode *np = VTONFS(ap->a_vp); 3207 3208 /* 3209 * Set access flag. 3210 */ 3211 np->n_flag |= NACC; 3212 getnanotime(&np->n_atim); 3213 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3214 } 3215 3216 /* 3217 * Write wrapper for special devices. 3218 */ 3219 static int 3220 nfsspec_write(ap) 3221 struct vop_write_args /* { 3222 struct vnode *a_vp; 3223 struct uio *a_uio; 3224 int a_ioflag; 3225 struct ucred *a_cred; 3226 } */ *ap; 3227 { 3228 struct nfsnode *np = VTONFS(ap->a_vp); 3229 3230 /* 3231 * Set update flag. 3232 */ 3233 np->n_flag |= NUPD; 3234 getnanotime(&np->n_mtim); 3235 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3236 } 3237 3238 /* 3239 * Close wrapper for special devices. 3240 * 3241 * Update the times on the nfsnode then do device close. 3242 */ 3243 static int 3244 nfsspec_close(ap) 3245 struct vop_close_args /* { 3246 struct vnode *a_vp; 3247 int a_fflag; 3248 struct ucred *a_cred; 3249 struct thread *a_td; 3250 } */ *ap; 3251 { 3252 struct vnode *vp = ap->a_vp; 3253 struct nfsnode *np = VTONFS(vp); 3254 struct vattr vattr; 3255 3256 if (np->n_flag & (NACC | NUPD)) { 3257 np->n_flag |= NCHG; 3258 if (vp->v_usecount == 1 && 3259 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3260 VATTR_NULL(&vattr); 3261 if (np->n_flag & NACC) 3262 vattr.va_atime = np->n_atim; 3263 if (np->n_flag & NUPD) 3264 vattr.va_mtime = np->n_mtim; 3265 (void)VOP_SETATTR(vp, &vattr, NFSVPCRED(vp), ap->a_td); 3266 } 3267 } 3268 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3269 } 3270 3271 /* 3272 * Read wrapper for fifos. 3273 */ 3274 static int 3275 nfsfifo_read(ap) 3276 struct vop_read_args /* { 3277 struct vnode *a_vp; 3278 struct uio *a_uio; 3279 int a_ioflag; 3280 struct ucred *a_cred; 3281 } */ *ap; 3282 { 3283 struct nfsnode *np = VTONFS(ap->a_vp); 3284 3285 /* 3286 * Set access flag. 3287 */ 3288 np->n_flag |= NACC; 3289 getnanotime(&np->n_atim); 3290 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3291 } 3292 3293 /* 3294 * Write wrapper for fifos. 3295 */ 3296 static int 3297 nfsfifo_write(ap) 3298 struct vop_write_args /* { 3299 struct vnode *a_vp; 3300 struct uio *a_uio; 3301 int a_ioflag; 3302 struct ucred *a_cred; 3303 } */ *ap; 3304 { 3305 struct nfsnode *np = VTONFS(ap->a_vp); 3306 3307 /* 3308 * Set update flag. 3309 */ 3310 np->n_flag |= NUPD; 3311 getnanotime(&np->n_mtim); 3312 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3313 } 3314 3315 /* 3316 * Close wrapper for fifos. 3317 * 3318 * Update the times on the nfsnode then do fifo close. 3319 */ 3320 static int 3321 nfsfifo_close(ap) 3322 struct vop_close_args /* { 3323 struct vnode *a_vp; 3324 int a_fflag; 3325 struct thread *a_td; 3326 } */ *ap; 3327 { 3328 struct vnode *vp = ap->a_vp; 3329 struct nfsnode *np = VTONFS(vp); 3330 struct vattr vattr; 3331 struct timespec ts; 3332 3333 if (np->n_flag & (NACC | NUPD)) { 3334 getnanotime(&ts); 3335 if (np->n_flag & NACC) 3336 np->n_atim = ts; 3337 if (np->n_flag & NUPD) 3338 np->n_mtim = ts; 3339 np->n_flag |= NCHG; 3340 if (vp->v_usecount == 1 && 3341 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3342 VATTR_NULL(&vattr); 3343 if (np->n_flag & NACC) 3344 vattr.va_atime = np->n_atim; 3345 if (np->n_flag & NUPD) 3346 vattr.va_mtime = np->n_mtim; 3347 (void)VOP_SETATTR(vp, &vattr, NFSVPCRED(vp), ap->a_td); 3348 } 3349 } 3350 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3351 } 3352 3353