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 1.12 2003/09/23 05:03:53 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 (struct vop_read_args *); 102 static int nfsspec_write (struct vop_write_args *); 103 static int nfsfifo_read (struct vop_read_args *); 104 static int nfsfifo_write (struct vop_write_args *); 105 static int nfsspec_close (struct vop_close_args *); 106 static int nfsfifo_close (struct vop_close_args *); 107 #define nfs_poll vop_nopoll 108 static int nfs_flush (struct vnode *,int,struct thread *,int); 109 static int nfs_setattrrpc (struct vnode *,struct vattr *,struct ucred *,struct thread *); 110 static int nfs_lookup (struct vop_lookup_args *); 111 static int nfs_create (struct vop_create_args *); 112 static int nfs_mknod (struct vop_mknod_args *); 113 static int nfs_open (struct vop_open_args *); 114 static int nfs_close (struct vop_close_args *); 115 static int nfs_access (struct vop_access_args *); 116 static int nfs_getattr (struct vop_getattr_args *); 117 static int nfs_setattr (struct vop_setattr_args *); 118 static int nfs_read (struct vop_read_args *); 119 static int nfs_mmap (struct vop_mmap_args *); 120 static int nfs_fsync (struct vop_fsync_args *); 121 static int nfs_remove (struct vop_remove_args *); 122 static int nfs_link (struct vop_link_args *); 123 static int nfs_rename (struct vop_rename_args *); 124 static int nfs_mkdir (struct vop_mkdir_args *); 125 static int nfs_rmdir (struct vop_rmdir_args *); 126 static int nfs_symlink (struct vop_symlink_args *); 127 static int nfs_readdir (struct vop_readdir_args *); 128 static int nfs_bmap (struct vop_bmap_args *); 129 static int nfs_strategy (struct vop_strategy_args *); 130 static int nfs_lookitup (struct vnode *, const char *, int, 131 struct ucred *, struct thread *, struct nfsnode **); 132 static int nfs_sillyrename (struct vnode *,struct vnode *,struct componentname *); 133 static int nfsspec_access (struct vop_access_args *); 134 static int nfs_readlink (struct vop_readlink_args *); 135 static int nfs_print (struct vop_print_args *); 136 static int nfs_advlock (struct vop_advlock_args *); 137 static int nfs_bwrite (struct vop_bwrite_args *); 138 /* 139 * Global vfs data structures for nfs 140 */ 141 vop_t **nfsv2_vnodeop_p; 142 static struct vnodeopv_entry_desc nfsv2_vnodeop_entries[] = { 143 { &vop_default_desc, (vop_t *) vop_defaultop }, 144 { &vop_access_desc, (vop_t *) nfs_access }, 145 { &vop_advlock_desc, (vop_t *) nfs_advlock }, 146 { &vop_bmap_desc, (vop_t *) nfs_bmap }, 147 { &vop_bwrite_desc, (vop_t *) nfs_bwrite }, 148 { &vop_close_desc, (vop_t *) nfs_close }, 149 { &vop_create_desc, (vop_t *) nfs_create }, 150 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 151 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 152 { &vop_getpages_desc, (vop_t *) nfs_getpages }, 153 { &vop_putpages_desc, (vop_t *) nfs_putpages }, 154 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 155 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 156 { &vop_lease_desc, (vop_t *) vop_null }, 157 { &vop_link_desc, (vop_t *) nfs_link }, 158 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 159 { &vop_lookup_desc, (vop_t *) nfs_lookup }, 160 { &vop_mkdir_desc, (vop_t *) nfs_mkdir }, 161 { &vop_mknod_desc, (vop_t *) nfs_mknod }, 162 { &vop_mmap_desc, (vop_t *) nfs_mmap }, 163 { &vop_open_desc, (vop_t *) nfs_open }, 164 { &vop_poll_desc, (vop_t *) nfs_poll }, 165 { &vop_print_desc, (vop_t *) nfs_print }, 166 { &vop_read_desc, (vop_t *) nfs_read }, 167 { &vop_readdir_desc, (vop_t *) nfs_readdir }, 168 { &vop_readlink_desc, (vop_t *) nfs_readlink }, 169 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 170 { &vop_remove_desc, (vop_t *) nfs_remove }, 171 { &vop_rename_desc, (vop_t *) nfs_rename }, 172 { &vop_rmdir_desc, (vop_t *) nfs_rmdir }, 173 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 174 { &vop_strategy_desc, (vop_t *) nfs_strategy }, 175 { &vop_symlink_desc, (vop_t *) nfs_symlink }, 176 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 177 { &vop_write_desc, (vop_t *) nfs_write }, 178 { NULL, NULL } 179 }; 180 static struct vnodeopv_desc nfsv2_vnodeop_opv_desc = 181 { &nfsv2_vnodeop_p, nfsv2_vnodeop_entries }; 182 VNODEOP_SET(nfsv2_vnodeop_opv_desc); 183 184 /* 185 * Special device vnode ops 186 */ 187 vop_t **spec_nfsv2nodeop_p; 188 static struct vnodeopv_entry_desc nfsv2_specop_entries[] = { 189 { &vop_default_desc, (vop_t *) spec_vnoperate }, 190 { &vop_access_desc, (vop_t *) nfsspec_access }, 191 { &vop_close_desc, (vop_t *) nfsspec_close }, 192 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 193 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 194 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 195 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 196 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 197 { &vop_print_desc, (vop_t *) nfs_print }, 198 { &vop_read_desc, (vop_t *) nfsspec_read }, 199 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 200 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 201 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 202 { &vop_write_desc, (vop_t *) nfsspec_write }, 203 { NULL, NULL } 204 }; 205 static struct vnodeopv_desc spec_nfsv2nodeop_opv_desc = 206 { &spec_nfsv2nodeop_p, nfsv2_specop_entries }; 207 VNODEOP_SET(spec_nfsv2nodeop_opv_desc); 208 209 vop_t **fifo_nfsv2nodeop_p; 210 static struct vnodeopv_entry_desc nfsv2_fifoop_entries[] = { 211 { &vop_default_desc, (vop_t *) fifo_vnoperate }, 212 { &vop_access_desc, (vop_t *) nfsspec_access }, 213 { &vop_close_desc, (vop_t *) nfsfifo_close }, 214 { &vop_fsync_desc, (vop_t *) nfs_fsync }, 215 { &vop_getattr_desc, (vop_t *) nfs_getattr }, 216 { &vop_inactive_desc, (vop_t *) nfs_inactive }, 217 { &vop_islocked_desc, (vop_t *) vop_stdislocked }, 218 { &vop_lock_desc, (vop_t *) vop_sharedlock }, 219 { &vop_print_desc, (vop_t *) nfs_print }, 220 { &vop_read_desc, (vop_t *) nfsfifo_read }, 221 { &vop_reclaim_desc, (vop_t *) nfs_reclaim }, 222 { &vop_setattr_desc, (vop_t *) nfs_setattr }, 223 { &vop_unlock_desc, (vop_t *) vop_stdunlock }, 224 { &vop_write_desc, (vop_t *) nfsfifo_write }, 225 { NULL, NULL } 226 }; 227 static struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc = 228 { &fifo_nfsv2nodeop_p, nfsv2_fifoop_entries }; 229 VNODEOP_SET(fifo_nfsv2nodeop_opv_desc); 230 231 static int nfs_mknodrpc (struct vnode *dvp, struct vnode **vpp, 232 struct componentname *cnp, 233 struct vattr *vap); 234 static int nfs_removerpc (struct vnode *dvp, const char *name, 235 int namelen, 236 struct ucred *cred, struct thread *td); 237 static int nfs_renamerpc (struct vnode *fdvp, const char *fnameptr, 238 int fnamelen, struct vnode *tdvp, 239 const char *tnameptr, int tnamelen, 240 struct ucred *cred, struct thread *td); 241 static int nfs_renameit (struct vnode *sdvp, 242 struct componentname *scnp, 243 struct sillyrename *sp); 244 245 /* 246 * Global variables 247 */ 248 extern u_int32_t nfs_true, nfs_false; 249 extern u_int32_t nfs_xdrneg1; 250 extern struct nfsstats nfsstats; 251 extern nfstype nfsv3_type[9]; 252 struct thread *nfs_iodwant[NFS_MAXASYNCDAEMON]; 253 struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; 254 int nfs_numasync = 0; 255 #define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) 256 257 SYSCTL_DECL(_vfs_nfs); 258 259 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; 260 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, 261 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); 262 263 static int nfsv3_commit_on_close = 0; 264 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, 265 &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); 266 #if 0 267 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, 268 &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); 269 270 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, 271 &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); 272 #endif 273 274 #define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ 275 | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ 276 | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) 277 static int 278 nfs3_access_otw(struct vnode *vp, int wmode, 279 struct thread *td, struct ucred *cred) 280 { 281 const int v3 = 1; 282 u_int32_t *tl; 283 int error = 0, attrflag; 284 285 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 286 caddr_t bpos, dpos, cp2; 287 int32_t t1, t2; 288 caddr_t cp; 289 u_int32_t rmode; 290 struct nfsnode *np = VTONFS(vp); 291 292 nfsstats.rpccnt[NFSPROC_ACCESS]++; 293 nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); 294 nfsm_fhtom(vp, v3); 295 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 296 *tl = txdr_unsigned(wmode); 297 nfsm_request(vp, NFSPROC_ACCESS, td, cred); 298 nfsm_postop_attr(vp, attrflag); 299 if (!error) { 300 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 301 rmode = fxdr_unsigned(u_int32_t, *tl); 302 np->n_mode = rmode; 303 np->n_modeuid = cred->cr_uid; 304 np->n_modestamp = time_second; 305 } 306 nfsm_reqdone; 307 return error; 308 } 309 310 /* 311 * nfs access vnode op. 312 * For nfs version 2, just return ok. File accesses may fail later. 313 * For nfs version 3, use the access rpc to check accessibility. If file modes 314 * are changed on the server, accesses might still fail later. 315 */ 316 static int 317 nfs_access(ap) 318 struct vop_access_args /* { 319 struct vnode *a_vp; 320 int a_mode; 321 struct ucred *a_cred; 322 struct thread *a_td; 323 } */ *ap; 324 { 325 struct vnode *vp = ap->a_vp; 326 int error = 0; 327 u_int32_t mode, wmode; 328 int v3 = NFS_ISV3(vp); 329 struct nfsnode *np = VTONFS(vp); 330 331 /* 332 * Disallow write attempts on filesystems mounted read-only; 333 * unless the file is a socket, fifo, or a block or character 334 * device resident on the filesystem. 335 */ 336 if ((ap->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 337 switch (vp->v_type) { 338 case VREG: 339 case VDIR: 340 case VLNK: 341 return (EROFS); 342 default: 343 break; 344 } 345 } 346 /* 347 * For nfs v3, check to see if we have done this recently, and if 348 * so return our cached result instead of making an ACCESS call. 349 * If not, do an access rpc, otherwise you are stuck emulating 350 * ufs_access() locally using the vattr. This may not be correct, 351 * since the server may apply other access criteria such as 352 * client uid-->server uid mapping that we do not know about. 353 */ 354 if (v3) { 355 if (ap->a_mode & VREAD) 356 mode = NFSV3ACCESS_READ; 357 else 358 mode = 0; 359 if (vp->v_type != VDIR) { 360 if (ap->a_mode & VWRITE) 361 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); 362 if (ap->a_mode & VEXEC) 363 mode |= NFSV3ACCESS_EXECUTE; 364 } else { 365 if (ap->a_mode & VWRITE) 366 mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | 367 NFSV3ACCESS_DELETE); 368 if (ap->a_mode & VEXEC) 369 mode |= NFSV3ACCESS_LOOKUP; 370 } 371 /* XXX safety belt, only make blanket request if caching */ 372 if (nfsaccess_cache_timeout > 0) { 373 wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | 374 NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | 375 NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; 376 } else { 377 wmode = mode; 378 } 379 380 /* 381 * Does our cached result allow us to give a definite yes to 382 * this request? 383 */ 384 if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) && 385 (ap->a_cred->cr_uid == np->n_modeuid) && 386 ((np->n_mode & mode) == mode)) { 387 nfsstats.accesscache_hits++; 388 } else { 389 /* 390 * Either a no, or a don't know. Go to the wire. 391 */ 392 nfsstats.accesscache_misses++; 393 error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred); 394 if (!error) { 395 if ((np->n_mode & mode) != mode) { 396 error = EACCES; 397 } 398 } 399 } 400 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_size has already been set to vap->va_size 739 * in nfs_meta_setsize(). We must set it again since 740 * nfs_loadattrcache() could be called through 741 * nfs_meta_setsize() and could modify np->n_size. 742 */ 743 np->n_vattr.va_size = np->n_size = vap->va_size; 744 }; 745 } else if ((vap->va_mtime.tv_sec != VNOVAL || 746 vap->va_atime.tv_sec != VNOVAL) && (np->n_flag & NMODIFIED) && 747 vp->v_type == VREG && 748 (error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1)) == EINTR) 749 return (error); 750 error = nfs_setattrrpc(vp, vap, ap->a_cred, ap->a_td); 751 if (error && vap->va_size != VNOVAL) { 752 np->n_size = np->n_vattr.va_size = tsize; 753 vnode_pager_setsize(vp, np->n_size); 754 } 755 return (error); 756 } 757 758 /* 759 * Do an nfs setattr rpc. 760 */ 761 static int 762 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, 763 struct ucred *cred, struct thread *td) 764 { 765 struct nfsv2_sattr *sp; 766 caddr_t cp; 767 int32_t t1, t2; 768 caddr_t bpos, dpos, cp2; 769 u_int32_t *tl; 770 int error = 0, wccflag = NFSV3_WCCRATTR; 771 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 772 int v3 = NFS_ISV3(vp); 773 774 nfsstats.rpccnt[NFSPROC_SETATTR]++; 775 nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); 776 nfsm_fhtom(vp, v3); 777 if (v3) { 778 nfsm_v3attrbuild(vap, TRUE); 779 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 780 *tl = nfs_false; 781 } else { 782 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 783 if (vap->va_mode == (mode_t)VNOVAL) 784 sp->sa_mode = nfs_xdrneg1; 785 else 786 sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); 787 if (vap->va_uid == (uid_t)VNOVAL) 788 sp->sa_uid = nfs_xdrneg1; 789 else 790 sp->sa_uid = txdr_unsigned(vap->va_uid); 791 if (vap->va_gid == (gid_t)VNOVAL) 792 sp->sa_gid = nfs_xdrneg1; 793 else 794 sp->sa_gid = txdr_unsigned(vap->va_gid); 795 sp->sa_size = txdr_unsigned(vap->va_size); 796 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 797 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 798 } 799 nfsm_request(vp, NFSPROC_SETATTR, td, cred); 800 if (v3) { 801 nfsm_wcc_data(vp, wccflag); 802 } else 803 nfsm_loadattr(vp, (struct vattr *)0); 804 nfsm_reqdone; 805 return (error); 806 } 807 808 /* 809 * nfs lookup call, one step at a time... 810 * First look in cache 811 * If not found, unlock the directory nfsnode and do the rpc 812 */ 813 static int 814 nfs_lookup(ap) 815 struct vop_lookup_args /* { 816 struct vnodeop_desc *a_desc; 817 struct vnode *a_dvp; 818 struct vnode **a_vpp; 819 struct componentname *a_cnp; 820 } */ *ap; 821 { 822 struct componentname *cnp = ap->a_cnp; 823 struct vnode *dvp = ap->a_dvp; 824 struct vnode **vpp = ap->a_vpp; 825 int flags = cnp->cn_flags; 826 struct vnode *newvp; 827 u_int32_t *tl; 828 caddr_t cp; 829 int32_t t1, t2; 830 struct nfsmount *nmp; 831 caddr_t bpos, dpos, cp2; 832 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 833 long len; 834 nfsfh_t *fhp; 835 struct nfsnode *np; 836 int lockparent, wantparent, error = 0, attrflag, fhsize; 837 int v3 = NFS_ISV3(dvp); 838 struct thread *td = cnp->cn_td; 839 840 *vpp = NULLVP; 841 if ((flags & CNP_ISLASTCN) && (dvp->v_mount->mnt_flag & MNT_RDONLY) && 842 (cnp->cn_nameiop == NAMEI_DELETE || cnp->cn_nameiop == NAMEI_RENAME)) 843 return (EROFS); 844 if (dvp->v_type != VDIR) 845 return (ENOTDIR); 846 lockparent = flags & CNP_LOCKPARENT; 847 wantparent = flags & (CNP_LOCKPARENT|CNP_WANTPARENT); 848 nmp = VFSTONFS(dvp->v_mount); 849 np = VTONFS(dvp); 850 if ((error = cache_lookup(dvp, vpp, cnp)) && error != ENOENT) { 851 struct vattr vattr; 852 int vpid; 853 854 if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { 855 *vpp = NULLVP; 856 return (error); 857 } 858 859 newvp = *vpp; 860 vpid = newvp->v_id; 861 /* 862 * See the comment starting `Step through' in ufs/ufs_lookup.c 863 * for an explanation of the locking protocol 864 */ 865 if (dvp == newvp) { 866 VREF(newvp); 867 error = 0; 868 } else if (flags & CNP_ISDOTDOT) { 869 VOP_UNLOCK(dvp, 0, td); 870 error = vget(newvp, LK_EXCLUSIVE, td); 871 if (!error && lockparent && (flags & CNP_ISLASTCN)) 872 error = vn_lock(dvp, LK_EXCLUSIVE, td); 873 } else { 874 error = vget(newvp, LK_EXCLUSIVE, td); 875 if (!lockparent || error || !(flags & CNP_ISLASTCN)) 876 VOP_UNLOCK(dvp, 0, td); 877 } 878 if (!error) { 879 if (vpid == newvp->v_id) { 880 if (!VOP_GETATTR(newvp, &vattr, td) 881 && vattr.va_ctime.tv_sec == VTONFS(newvp)->n_ctime) { 882 nfsstats.lookupcache_hits++; 883 if (cnp->cn_nameiop != NAMEI_LOOKUP && 884 (flags & CNP_ISLASTCN)) 885 cnp->cn_flags |= CNP_SAVENAME; 886 return (0); 887 } 888 cache_purge(newvp); 889 } 890 vput(newvp); 891 if (lockparent && dvp != newvp && (flags & CNP_ISLASTCN)) 892 VOP_UNLOCK(dvp, 0, td); 893 } 894 error = vn_lock(dvp, LK_EXCLUSIVE, td); 895 *vpp = NULLVP; 896 if (error) 897 return (error); 898 } 899 error = 0; 900 newvp = NULLVP; 901 nfsstats.lookupcache_misses++; 902 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 903 len = cnp->cn_namelen; 904 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 905 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 906 nfsm_fhtom(dvp, v3); 907 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 908 nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_td, cnp->cn_cred); 909 if (error) { 910 nfsm_postop_attr(dvp, attrflag); 911 m_freem(mrep); 912 goto nfsmout; 913 } 914 nfsm_getfh(fhp, fhsize, v3); 915 916 /* 917 * Handle RENAME case... 918 */ 919 if (cnp->cn_nameiop == NAMEI_RENAME && wantparent && (flags & CNP_ISLASTCN)) { 920 if (NFS_CMPFH(np, fhp, fhsize)) { 921 m_freem(mrep); 922 return (EISDIR); 923 } 924 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 925 if (error) { 926 m_freem(mrep); 927 return (error); 928 } 929 newvp = NFSTOV(np); 930 if (v3) { 931 nfsm_postop_attr(newvp, attrflag); 932 nfsm_postop_attr(dvp, attrflag); 933 } else 934 nfsm_loadattr(newvp, (struct vattr *)0); 935 *vpp = newvp; 936 m_freem(mrep); 937 cnp->cn_flags |= CNP_SAVENAME; 938 if (!lockparent) 939 VOP_UNLOCK(dvp, 0, td); 940 return (0); 941 } 942 943 if (flags & CNP_ISDOTDOT) { 944 VOP_UNLOCK(dvp, 0, td); 945 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 946 if (error) { 947 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td); 948 return (error); 949 } 950 newvp = NFSTOV(np); 951 if (lockparent && (flags & CNP_ISLASTCN) && 952 (error = vn_lock(dvp, LK_EXCLUSIVE, td))) { 953 vput(newvp); 954 return (error); 955 } 956 } else if (NFS_CMPFH(np, fhp, fhsize)) { 957 VREF(dvp); 958 newvp = dvp; 959 } else { 960 error = nfs_nget(dvp->v_mount, fhp, fhsize, &np); 961 if (error) { 962 m_freem(mrep); 963 return (error); 964 } 965 if (!lockparent || !(flags & CNP_ISLASTCN)) 966 VOP_UNLOCK(dvp, 0, td); 967 newvp = NFSTOV(np); 968 } 969 if (v3) { 970 nfsm_postop_attr(newvp, attrflag); 971 nfsm_postop_attr(dvp, attrflag); 972 } else 973 nfsm_loadattr(newvp, (struct vattr *)0); 974 if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) 975 cnp->cn_flags |= CNP_SAVENAME; 976 if ((cnp->cn_flags & CNP_MAKEENTRY) && 977 (cnp->cn_nameiop != NAMEI_DELETE || !(flags & CNP_ISLASTCN))) { 978 np->n_ctime = np->n_vattr.va_ctime.tv_sec; 979 cache_enter(dvp, newvp, cnp); 980 } 981 *vpp = newvp; 982 nfsm_reqdone; 983 if (error) { 984 if (newvp != NULLVP) { 985 vrele(newvp); 986 *vpp = NULLVP; 987 } 988 if ((cnp->cn_nameiop == NAMEI_CREATE || cnp->cn_nameiop == NAMEI_RENAME) && 989 (flags & CNP_ISLASTCN) && error == ENOENT) { 990 if (!lockparent) 991 VOP_UNLOCK(dvp, 0, td); 992 if (dvp->v_mount->mnt_flag & MNT_RDONLY) 993 error = EROFS; 994 else 995 error = EJUSTRETURN; 996 } 997 if (cnp->cn_nameiop != NAMEI_LOOKUP && (flags & CNP_ISLASTCN)) 998 cnp->cn_flags |= CNP_SAVENAME; 999 } 1000 return (error); 1001 } 1002 1003 /* 1004 * nfs read call. 1005 * Just call nfs_bioread() to do the work. 1006 */ 1007 static int 1008 nfs_read(ap) 1009 struct vop_read_args /* { 1010 struct vnode *a_vp; 1011 struct uio *a_uio; 1012 int a_ioflag; 1013 struct ucred *a_cred; 1014 } */ *ap; 1015 { 1016 struct vnode *vp = ap->a_vp; 1017 1018 if (vp->v_type != VREG) 1019 return (EPERM); 1020 return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag)); 1021 } 1022 1023 /* 1024 * nfs readlink call 1025 */ 1026 static int 1027 nfs_readlink(ap) 1028 struct vop_readlink_args /* { 1029 struct vnode *a_vp; 1030 struct uio *a_uio; 1031 struct ucred *a_cred; 1032 } */ *ap; 1033 { 1034 struct vnode *vp = ap->a_vp; 1035 1036 if (vp->v_type != VLNK) 1037 return (EINVAL); 1038 return (nfs_bioread(vp, ap->a_uio, 0)); 1039 } 1040 1041 /* 1042 * Do a readlink rpc. 1043 * Called by nfs_doio() from below the buffer cache. 1044 */ 1045 int 1046 nfs_readlinkrpc(struct vnode *vp, struct uio *uiop) 1047 { 1048 u_int32_t *tl; 1049 caddr_t cp; 1050 int32_t t1, t2; 1051 caddr_t bpos, dpos, cp2; 1052 int error = 0, len, attrflag; 1053 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1054 int v3 = NFS_ISV3(vp); 1055 1056 nfsstats.rpccnt[NFSPROC_READLINK]++; 1057 nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); 1058 nfsm_fhtom(vp, v3); 1059 nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, NFSVPCRED(vp)); 1060 if (v3) 1061 nfsm_postop_attr(vp, attrflag); 1062 if (!error) { 1063 nfsm_strsiz(len, NFS_MAXPATHLEN); 1064 if (len == NFS_MAXPATHLEN) { 1065 struct nfsnode *np = VTONFS(vp); 1066 if (np->n_size && np->n_size < NFS_MAXPATHLEN) 1067 len = np->n_size; 1068 } 1069 nfsm_mtouio(uiop, len); 1070 } 1071 nfsm_reqdone; 1072 return (error); 1073 } 1074 1075 /* 1076 * nfs read rpc call 1077 * Ditto above 1078 */ 1079 int 1080 nfs_readrpc(struct vnode *vp, struct uio *uiop) 1081 { 1082 u_int32_t *tl; 1083 caddr_t cp; 1084 int32_t t1, t2; 1085 caddr_t bpos, dpos, cp2; 1086 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1087 struct nfsmount *nmp; 1088 int error = 0, len, retlen, tsiz, eof, attrflag; 1089 int v3 = NFS_ISV3(vp); 1090 1091 #ifndef nolint 1092 eof = 0; 1093 #endif 1094 nmp = VFSTONFS(vp->v_mount); 1095 tsiz = uiop->uio_resid; 1096 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1097 return (EFBIG); 1098 while (tsiz > 0) { 1099 nfsstats.rpccnt[NFSPROC_READ]++; 1100 len = (tsiz > nmp->nm_rsize) ? nmp->nm_rsize : tsiz; 1101 nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); 1102 nfsm_fhtom(vp, v3); 1103 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED * 3); 1104 if (v3) { 1105 txdr_hyper(uiop->uio_offset, tl); 1106 *(tl + 2) = txdr_unsigned(len); 1107 } else { 1108 *tl++ = txdr_unsigned(uiop->uio_offset); 1109 *tl++ = txdr_unsigned(len); 1110 *tl = 0; 1111 } 1112 nfsm_request(vp, NFSPROC_READ, uiop->uio_td, NFSVPCRED(vp)); 1113 if (v3) { 1114 nfsm_postop_attr(vp, attrflag); 1115 if (error) { 1116 m_freem(mrep); 1117 goto nfsmout; 1118 } 1119 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1120 eof = fxdr_unsigned(int, *(tl + 1)); 1121 } else 1122 nfsm_loadattr(vp, (struct vattr *)0); 1123 nfsm_strsiz(retlen, nmp->nm_rsize); 1124 nfsm_mtouio(uiop, retlen); 1125 m_freem(mrep); 1126 tsiz -= retlen; 1127 if (v3) { 1128 if (eof || retlen == 0) { 1129 tsiz = 0; 1130 } 1131 } else if (retlen < len) { 1132 tsiz = 0; 1133 } 1134 } 1135 nfsmout: 1136 return (error); 1137 } 1138 1139 /* 1140 * nfs write call 1141 */ 1142 int 1143 nfs_writerpc(vp, uiop, iomode, must_commit) 1144 struct vnode *vp; 1145 struct uio *uiop; 1146 int *iomode, *must_commit; 1147 { 1148 u_int32_t *tl; 1149 caddr_t cp; 1150 int32_t t1, t2, backup; 1151 caddr_t bpos, dpos, cp2; 1152 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1153 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1154 int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; 1155 int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; 1156 1157 #ifndef DIAGNOSTIC 1158 if (uiop->uio_iovcnt != 1) 1159 panic("nfs: writerpc iovcnt > 1"); 1160 #endif 1161 *must_commit = 0; 1162 tsiz = uiop->uio_resid; 1163 if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize) 1164 return (EFBIG); 1165 while (tsiz > 0) { 1166 nfsstats.rpccnt[NFSPROC_WRITE]++; 1167 len = (tsiz > nmp->nm_wsize) ? nmp->nm_wsize : tsiz; 1168 nfsm_reqhead(vp, NFSPROC_WRITE, 1169 NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); 1170 nfsm_fhtom(vp, v3); 1171 if (v3) { 1172 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1173 txdr_hyper(uiop->uio_offset, tl); 1174 tl += 2; 1175 *tl++ = txdr_unsigned(len); 1176 *tl++ = txdr_unsigned(*iomode); 1177 *tl = txdr_unsigned(len); 1178 } else { 1179 u_int32_t x; 1180 1181 nfsm_build(tl, u_int32_t *, 4 * NFSX_UNSIGNED); 1182 /* Set both "begin" and "current" to non-garbage. */ 1183 x = txdr_unsigned((u_int32_t)uiop->uio_offset); 1184 *tl++ = x; /* "begin offset" */ 1185 *tl++ = x; /* "current offset" */ 1186 x = txdr_unsigned(len); 1187 *tl++ = x; /* total to this offset */ 1188 *tl = x; /* size of this write */ 1189 } 1190 nfsm_uiotom(uiop, len); 1191 nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, NFSVPCRED(vp)); 1192 if (v3) { 1193 wccflag = NFSV3_WCCCHK; 1194 nfsm_wcc_data(vp, wccflag); 1195 if (!error) { 1196 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED 1197 + NFSX_V3WRITEVERF); 1198 rlen = fxdr_unsigned(int, *tl++); 1199 if (rlen == 0) { 1200 error = NFSERR_IO; 1201 m_freem(mrep); 1202 break; 1203 } else if (rlen < len) { 1204 backup = len - rlen; 1205 uiop->uio_iov->iov_base -= backup; 1206 uiop->uio_iov->iov_len += backup; 1207 uiop->uio_offset -= backup; 1208 uiop->uio_resid += backup; 1209 len = rlen; 1210 } 1211 commit = fxdr_unsigned(int, *tl++); 1212 1213 /* 1214 * Return the lowest committment level 1215 * obtained by any of the RPCs. 1216 */ 1217 if (committed == NFSV3WRITE_FILESYNC) 1218 committed = commit; 1219 else if (committed == NFSV3WRITE_DATASYNC && 1220 commit == NFSV3WRITE_UNSTABLE) 1221 committed = commit; 1222 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ 1223 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1224 NFSX_V3WRITEVERF); 1225 nmp->nm_state |= NFSSTA_HASWRITEVERF; 1226 } else if (bcmp((caddr_t)tl, 1227 (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { 1228 *must_commit = 1; 1229 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 1230 NFSX_V3WRITEVERF); 1231 } 1232 } 1233 } else 1234 nfsm_loadattr(vp, (struct vattr *)0); 1235 if (wccflag) 1236 VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime.tv_sec; 1237 m_freem(mrep); 1238 if (error) 1239 break; 1240 tsiz -= len; 1241 } 1242 nfsmout: 1243 if (vp->v_mount->mnt_flag & MNT_ASYNC) 1244 committed = NFSV3WRITE_FILESYNC; 1245 *iomode = committed; 1246 if (error) 1247 uiop->uio_resid = tsiz; 1248 return (error); 1249 } 1250 1251 /* 1252 * nfs mknod rpc 1253 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the 1254 * mode set to specify the file type and the size field for rdev. 1255 */ 1256 static int 1257 nfs_mknodrpc(dvp, vpp, cnp, vap) 1258 struct vnode *dvp; 1259 struct vnode **vpp; 1260 struct componentname *cnp; 1261 struct vattr *vap; 1262 { 1263 struct nfsv2_sattr *sp; 1264 u_int32_t *tl; 1265 caddr_t cp; 1266 int32_t t1, t2; 1267 struct vnode *newvp = (struct vnode *)0; 1268 struct nfsnode *np = (struct nfsnode *)0; 1269 struct vattr vattr; 1270 char *cp2; 1271 caddr_t bpos, dpos; 1272 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; 1273 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1274 u_int32_t rdev; 1275 int v3 = NFS_ISV3(dvp); 1276 1277 if (vap->va_type == VCHR || vap->va_type == VBLK) 1278 rdev = txdr_unsigned(vap->va_rdev); 1279 else if (vap->va_type == VFIFO || vap->va_type == VSOCK) 1280 rdev = nfs_xdrneg1; 1281 else { 1282 return (EOPNOTSUPP); 1283 } 1284 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1285 return (error); 1286 } 1287 nfsstats.rpccnt[NFSPROC_MKNOD]++; 1288 nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + 1289 + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1290 nfsm_fhtom(dvp, v3); 1291 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1292 if (v3) { 1293 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1294 *tl++ = vtonfsv3_type(vap->va_type); 1295 nfsm_v3attrbuild(vap, FALSE); 1296 if (vap->va_type == VCHR || vap->va_type == VBLK) { 1297 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1298 *tl++ = txdr_unsigned(umajor(vap->va_rdev)); 1299 *tl = txdr_unsigned(uminor(vap->va_rdev)); 1300 } 1301 } else { 1302 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1303 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1304 sp->sa_uid = nfs_xdrneg1; 1305 sp->sa_gid = nfs_xdrneg1; 1306 sp->sa_size = rdev; 1307 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1308 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1309 } 1310 nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_td, cnp->cn_cred); 1311 if (!error) { 1312 nfsm_mtofh(dvp, newvp, v3, gotvp); 1313 if (!gotvp) { 1314 if (newvp) { 1315 vput(newvp); 1316 newvp = (struct vnode *)0; 1317 } 1318 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1319 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1320 if (!error) 1321 newvp = NFSTOV(np); 1322 } 1323 } 1324 if (v3) 1325 nfsm_wcc_data(dvp, wccflag); 1326 nfsm_reqdone; 1327 if (error) { 1328 if (newvp) 1329 vput(newvp); 1330 } else { 1331 if (cnp->cn_flags & CNP_MAKEENTRY) 1332 cache_enter(dvp, newvp, cnp); 1333 *vpp = newvp; 1334 } 1335 VTONFS(dvp)->n_flag |= NMODIFIED; 1336 if (!wccflag) 1337 VTONFS(dvp)->n_attrstamp = 0; 1338 return (error); 1339 } 1340 1341 /* 1342 * nfs mknod vop 1343 * just call nfs_mknodrpc() to do the work. 1344 */ 1345 /* ARGSUSED */ 1346 static int 1347 nfs_mknod(ap) 1348 struct vop_mknod_args /* { 1349 struct vnode *a_dvp; 1350 struct vnode **a_vpp; 1351 struct componentname *a_cnp; 1352 struct vattr *a_vap; 1353 } */ *ap; 1354 { 1355 return nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap); 1356 } 1357 1358 static u_long create_verf; 1359 /* 1360 * nfs file create call 1361 */ 1362 static int 1363 nfs_create(ap) 1364 struct vop_create_args /* { 1365 struct vnode *a_dvp; 1366 struct vnode **a_vpp; 1367 struct componentname *a_cnp; 1368 struct vattr *a_vap; 1369 } */ *ap; 1370 { 1371 struct vnode *dvp = ap->a_dvp; 1372 struct vattr *vap = ap->a_vap; 1373 struct componentname *cnp = ap->a_cnp; 1374 struct nfsv2_sattr *sp; 1375 u_int32_t *tl; 1376 caddr_t cp; 1377 int32_t t1, t2; 1378 struct nfsnode *np = (struct nfsnode *)0; 1379 struct vnode *newvp = (struct vnode *)0; 1380 caddr_t bpos, dpos, cp2; 1381 int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; 1382 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1383 struct vattr vattr; 1384 int v3 = NFS_ISV3(dvp); 1385 1386 /* 1387 * Oops, not for me.. 1388 */ 1389 if (vap->va_type == VSOCK) 1390 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap)); 1391 1392 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1393 return (error); 1394 } 1395 if (vap->va_vaflags & VA_EXCLUSIVE) 1396 fmode |= O_EXCL; 1397 again: 1398 nfsstats.rpccnt[NFSPROC_CREATE]++; 1399 nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + 1400 nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); 1401 nfsm_fhtom(dvp, v3); 1402 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1403 if (v3) { 1404 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1405 if (fmode & O_EXCL) { 1406 *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); 1407 nfsm_build(tl, u_int32_t *, NFSX_V3CREATEVERF); 1408 #ifdef INET 1409 if (!TAILQ_EMPTY(&in_ifaddrhead)) 1410 *tl++ = IA_SIN(in_ifaddrhead.tqh_first)->sin_addr.s_addr; 1411 else 1412 #endif 1413 *tl++ = create_verf; 1414 *tl = ++create_verf; 1415 } else { 1416 *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); 1417 nfsm_v3attrbuild(vap, FALSE); 1418 } 1419 } else { 1420 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1421 sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); 1422 sp->sa_uid = nfs_xdrneg1; 1423 sp->sa_gid = nfs_xdrneg1; 1424 sp->sa_size = 0; 1425 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1426 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1427 } 1428 nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_td, cnp->cn_cred); 1429 if (!error) { 1430 nfsm_mtofh(dvp, newvp, v3, gotvp); 1431 if (!gotvp) { 1432 if (newvp) { 1433 vput(newvp); 1434 newvp = (struct vnode *)0; 1435 } 1436 error = nfs_lookitup(dvp, cnp->cn_nameptr, 1437 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td, &np); 1438 if (!error) 1439 newvp = NFSTOV(np); 1440 } 1441 } 1442 if (v3) 1443 nfsm_wcc_data(dvp, wccflag); 1444 nfsm_reqdone; 1445 if (error) { 1446 if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { 1447 fmode &= ~O_EXCL; 1448 goto again; 1449 } 1450 if (newvp) 1451 vput(newvp); 1452 } else if (v3 && (fmode & O_EXCL)) { 1453 /* 1454 * We are normally called with only a partially initialized 1455 * VAP. Since the NFSv3 spec says that server may use the 1456 * file attributes to store the verifier, the spec requires 1457 * us to do a SETATTR RPC. FreeBSD servers store the verifier 1458 * in atime, but we can't really assume that all servers will 1459 * so we ensure that our SETATTR sets both atime and mtime. 1460 */ 1461 if (vap->va_mtime.tv_sec == VNOVAL) 1462 vfs_timestamp(&vap->va_mtime); 1463 if (vap->va_atime.tv_sec == VNOVAL) 1464 vap->va_atime = vap->va_mtime; 1465 error = nfs_setattrrpc(newvp, vap, cnp->cn_cred, cnp->cn_td); 1466 } 1467 if (!error) { 1468 if (cnp->cn_flags & CNP_MAKEENTRY) 1469 cache_enter(dvp, newvp, cnp); 1470 *ap->a_vpp = newvp; 1471 } 1472 VTONFS(dvp)->n_flag |= NMODIFIED; 1473 if (!wccflag) 1474 VTONFS(dvp)->n_attrstamp = 0; 1475 return (error); 1476 } 1477 1478 /* 1479 * nfs file remove call 1480 * To try and make nfs semantics closer to ufs semantics, a file that has 1481 * other processes using the vnode is renamed instead of removed and then 1482 * removed later on the last close. 1483 * - If v_usecount > 1 1484 * If a rename is not already in the works 1485 * call nfs_sillyrename() to set it up 1486 * else 1487 * do the remove rpc 1488 */ 1489 static int 1490 nfs_remove(ap) 1491 struct vop_remove_args /* { 1492 struct vnodeop_desc *a_desc; 1493 struct vnode * a_dvp; 1494 struct vnode * a_vp; 1495 struct componentname * a_cnp; 1496 } */ *ap; 1497 { 1498 struct vnode *vp = ap->a_vp; 1499 struct vnode *dvp = ap->a_dvp; 1500 struct componentname *cnp = ap->a_cnp; 1501 struct nfsnode *np = VTONFS(vp); 1502 int error = 0; 1503 struct vattr vattr; 1504 1505 #ifndef DIAGNOSTIC 1506 if ((cnp->cn_flags & CNP_HASBUF) == 0) 1507 panic("nfs_remove: no name"); 1508 if (vp->v_usecount < 1) 1509 panic("nfs_remove: bad v_usecount"); 1510 #endif 1511 if (vp->v_type == VDIR) 1512 error = EPERM; 1513 else if (vp->v_usecount == 1 || (np->n_sillyrename && 1514 VOP_GETATTR(vp, &vattr, cnp->cn_td) == 0 && 1515 vattr.va_nlink > 1)) { 1516 /* 1517 * Purge the name cache so that the chance of a lookup for 1518 * the name succeeding while the remove is in progress is 1519 * minimized. Without node locking it can still happen, such 1520 * that an I/O op returns ESTALE, but since you get this if 1521 * another host removes the file.. 1522 */ 1523 cache_purge(vp); 1524 /* 1525 * throw away biocache buffers, mainly to avoid 1526 * unnecessary delayed writes later. 1527 */ 1528 error = nfs_vinvalbuf(vp, 0, cnp->cn_td, 1); 1529 /* Do the rpc */ 1530 if (error != EINTR) 1531 error = nfs_removerpc(dvp, cnp->cn_nameptr, 1532 cnp->cn_namelen, cnp->cn_cred, cnp->cn_td); 1533 /* 1534 * Kludge City: If the first reply to the remove rpc is lost.. 1535 * the reply to the retransmitted request will be ENOENT 1536 * since the file was in fact removed 1537 * Therefore, we cheat and return success. 1538 */ 1539 if (error == ENOENT) 1540 error = 0; 1541 } else if (!np->n_sillyrename) 1542 error = nfs_sillyrename(dvp, vp, cnp); 1543 np->n_attrstamp = 0; 1544 return (error); 1545 } 1546 1547 /* 1548 * nfs file remove rpc called from nfs_inactive 1549 */ 1550 int 1551 nfs_removeit(struct sillyrename *sp) 1552 { 1553 1554 return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, 1555 sp->s_cred, NULL)); 1556 } 1557 1558 /* 1559 * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). 1560 */ 1561 static int 1562 nfs_removerpc(dvp, name, namelen, cred, td) 1563 struct vnode *dvp; 1564 const char *name; 1565 int namelen; 1566 struct ucred *cred; 1567 struct thread *td; 1568 { 1569 u_int32_t *tl; 1570 caddr_t cp; 1571 int32_t t1, t2; 1572 caddr_t bpos, dpos, cp2; 1573 int error = 0, wccflag = NFSV3_WCCRATTR; 1574 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1575 int v3 = NFS_ISV3(dvp); 1576 1577 nfsstats.rpccnt[NFSPROC_REMOVE]++; 1578 nfsm_reqhead(dvp, NFSPROC_REMOVE, 1579 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); 1580 nfsm_fhtom(dvp, v3); 1581 nfsm_strtom(name, namelen, NFS_MAXNAMLEN); 1582 nfsm_request(dvp, NFSPROC_REMOVE, td, cred); 1583 if (v3) 1584 nfsm_wcc_data(dvp, wccflag); 1585 nfsm_reqdone; 1586 VTONFS(dvp)->n_flag |= NMODIFIED; 1587 if (!wccflag) 1588 VTONFS(dvp)->n_attrstamp = 0; 1589 return (error); 1590 } 1591 1592 /* 1593 * nfs file rename call 1594 */ 1595 static int 1596 nfs_rename(ap) 1597 struct vop_rename_args /* { 1598 struct vnode *a_fdvp; 1599 struct vnode *a_fvp; 1600 struct componentname *a_fcnp; 1601 struct vnode *a_tdvp; 1602 struct vnode *a_tvp; 1603 struct componentname *a_tcnp; 1604 } */ *ap; 1605 { 1606 struct vnode *fvp = ap->a_fvp; 1607 struct vnode *tvp = ap->a_tvp; 1608 struct vnode *fdvp = ap->a_fdvp; 1609 struct vnode *tdvp = ap->a_tdvp; 1610 struct componentname *tcnp = ap->a_tcnp; 1611 struct componentname *fcnp = ap->a_fcnp; 1612 int error; 1613 1614 #ifndef DIAGNOSTIC 1615 if ((tcnp->cn_flags & CNP_HASBUF) == 0 || 1616 (fcnp->cn_flags & CNP_HASBUF) == 0) 1617 panic("nfs_rename: no name"); 1618 #endif 1619 /* Check for cross-device rename */ 1620 if ((fvp->v_mount != tdvp->v_mount) || 1621 (tvp && (fvp->v_mount != tvp->v_mount))) { 1622 error = EXDEV; 1623 goto out; 1624 } 1625 1626 /* 1627 * We have to flush B_DELWRI data prior to renaming 1628 * the file. If we don't, the delayed-write buffers 1629 * can be flushed out later after the file has gone stale 1630 * under NFSV3. NFSV2 does not have this problem because 1631 * ( as far as I can tell ) it flushes dirty buffers more 1632 * often. 1633 */ 1634 1635 VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_td); 1636 if (tvp) 1637 VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_td); 1638 1639 /* 1640 * If the tvp exists and is in use, sillyrename it before doing the 1641 * rename of the new file over it. 1642 * XXX Can't sillyrename a directory. 1643 */ 1644 if (tvp && tvp->v_usecount > 1 && !VTONFS(tvp)->n_sillyrename && 1645 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { 1646 vput(tvp); 1647 tvp = NULL; 1648 } 1649 1650 error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, 1651 tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, 1652 tcnp->cn_td); 1653 1654 if (fvp->v_type == VDIR) { 1655 if (tvp != NULL && tvp->v_type == VDIR) 1656 cache_purge(tdvp); 1657 cache_purge(fdvp); 1658 } 1659 1660 out: 1661 if (tdvp == tvp) 1662 vrele(tdvp); 1663 else 1664 vput(tdvp); 1665 if (tvp) 1666 vput(tvp); 1667 vrele(fdvp); 1668 vrele(fvp); 1669 /* 1670 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. 1671 */ 1672 if (error == ENOENT) 1673 error = 0; 1674 return (error); 1675 } 1676 1677 /* 1678 * nfs file rename rpc called from nfs_remove() above 1679 */ 1680 static int 1681 nfs_renameit(sdvp, scnp, sp) 1682 struct vnode *sdvp; 1683 struct componentname *scnp; 1684 struct sillyrename *sp; 1685 { 1686 return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, 1687 sdvp, sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_td)); 1688 } 1689 1690 /* 1691 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). 1692 */ 1693 static int 1694 nfs_renamerpc(fdvp, fnameptr, fnamelen, tdvp, tnameptr, tnamelen, cred, td) 1695 struct vnode *fdvp; 1696 const char *fnameptr; 1697 int fnamelen; 1698 struct vnode *tdvp; 1699 const char *tnameptr; 1700 int tnamelen; 1701 struct ucred *cred; 1702 struct thread *td; 1703 { 1704 u_int32_t *tl; 1705 caddr_t cp; 1706 int32_t t1, t2; 1707 caddr_t bpos, dpos, cp2; 1708 int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; 1709 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1710 int v3 = NFS_ISV3(fdvp); 1711 1712 nfsstats.rpccnt[NFSPROC_RENAME]++; 1713 nfsm_reqhead(fdvp, NFSPROC_RENAME, 1714 (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + 1715 nfsm_rndup(tnamelen)); 1716 nfsm_fhtom(fdvp, v3); 1717 nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); 1718 nfsm_fhtom(tdvp, v3); 1719 nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); 1720 nfsm_request(fdvp, NFSPROC_RENAME, td, cred); 1721 if (v3) { 1722 nfsm_wcc_data(fdvp, fwccflag); 1723 nfsm_wcc_data(tdvp, twccflag); 1724 } 1725 nfsm_reqdone; 1726 VTONFS(fdvp)->n_flag |= NMODIFIED; 1727 VTONFS(tdvp)->n_flag |= NMODIFIED; 1728 if (!fwccflag) 1729 VTONFS(fdvp)->n_attrstamp = 0; 1730 if (!twccflag) 1731 VTONFS(tdvp)->n_attrstamp = 0; 1732 return (error); 1733 } 1734 1735 /* 1736 * nfs hard link create call 1737 */ 1738 static int 1739 nfs_link(ap) 1740 struct vop_link_args /* { 1741 struct vnode *a_tdvp; 1742 struct vnode *a_vp; 1743 struct componentname *a_cnp; 1744 } */ *ap; 1745 { 1746 struct vnode *vp = ap->a_vp; 1747 struct vnode *tdvp = ap->a_tdvp; 1748 struct componentname *cnp = ap->a_cnp; 1749 u_int32_t *tl; 1750 caddr_t cp; 1751 int32_t t1, t2; 1752 caddr_t bpos, dpos, cp2; 1753 int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; 1754 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1755 int v3; 1756 1757 if (vp->v_mount != tdvp->v_mount) { 1758 return (EXDEV); 1759 } 1760 1761 /* 1762 * Push all writes to the server, so that the attribute cache 1763 * doesn't get "out of sync" with the server. 1764 * XXX There should be a better way! 1765 */ 1766 VOP_FSYNC(vp, MNT_WAIT, cnp->cn_td); 1767 1768 v3 = NFS_ISV3(vp); 1769 nfsstats.rpccnt[NFSPROC_LINK]++; 1770 nfsm_reqhead(vp, NFSPROC_LINK, 1771 NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 1772 nfsm_fhtom(vp, v3); 1773 nfsm_fhtom(tdvp, v3); 1774 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1775 nfsm_request(vp, NFSPROC_LINK, cnp->cn_td, cnp->cn_cred); 1776 if (v3) { 1777 nfsm_postop_attr(vp, attrflag); 1778 nfsm_wcc_data(tdvp, wccflag); 1779 } 1780 nfsm_reqdone; 1781 VTONFS(tdvp)->n_flag |= NMODIFIED; 1782 if (!attrflag) 1783 VTONFS(vp)->n_attrstamp = 0; 1784 if (!wccflag) 1785 VTONFS(tdvp)->n_attrstamp = 0; 1786 /* 1787 * Kludge: Map EEXIST => 0 assuming that it is a reply to a retry. 1788 */ 1789 if (error == EEXIST) 1790 error = 0; 1791 return (error); 1792 } 1793 1794 /* 1795 * nfs symbolic link create call 1796 */ 1797 static int 1798 nfs_symlink(ap) 1799 struct vop_symlink_args /* { 1800 struct vnode *a_dvp; 1801 struct vnode **a_vpp; 1802 struct componentname *a_cnp; 1803 struct vattr *a_vap; 1804 char *a_target; 1805 } */ *ap; 1806 { 1807 struct vnode *dvp = ap->a_dvp; 1808 struct vattr *vap = ap->a_vap; 1809 struct componentname *cnp = ap->a_cnp; 1810 struct nfsv2_sattr *sp; 1811 u_int32_t *tl; 1812 caddr_t cp; 1813 int32_t t1, t2; 1814 caddr_t bpos, dpos, cp2; 1815 int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; 1816 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1817 struct vnode *newvp = (struct vnode *)0; 1818 int v3 = NFS_ISV3(dvp); 1819 1820 nfsstats.rpccnt[NFSPROC_SYMLINK]++; 1821 slen = strlen(ap->a_target); 1822 nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + 1823 nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); 1824 nfsm_fhtom(dvp, v3); 1825 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 1826 if (v3) { 1827 nfsm_v3attrbuild(vap, FALSE); 1828 } 1829 nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); 1830 if (!v3) { 1831 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1832 sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); 1833 sp->sa_uid = nfs_xdrneg1; 1834 sp->sa_gid = nfs_xdrneg1; 1835 sp->sa_size = nfs_xdrneg1; 1836 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1837 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1838 } 1839 1840 /* 1841 * Issue the NFS request and get the rpc response. 1842 * 1843 * Only NFSv3 responses returning an error of 0 actually return 1844 * a file handle that can be converted into newvp without having 1845 * to do an extra lookup rpc. 1846 */ 1847 nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_td, cnp->cn_cred); 1848 if (v3) { 1849 if (error == 0) 1850 nfsm_mtofh(dvp, newvp, v3, gotvp); 1851 nfsm_wcc_data(dvp, wccflag); 1852 } 1853 1854 /* 1855 * out code jumps -> here, mrep is also freed. 1856 */ 1857 1858 nfsm_reqdone; 1859 1860 /* 1861 * If we get an EEXIST error, silently convert it to no-error 1862 * in case of an NFS retry. 1863 */ 1864 if (error == EEXIST) 1865 error = 0; 1866 1867 /* 1868 * If we do not have (or no longer have) an error, and we could 1869 * not extract the newvp from the response due to the request being 1870 * NFSv2 or the error being EEXIST. We have to do a lookup in order 1871 * to obtain a newvp to return. 1872 */ 1873 if (error == 0 && newvp == NULL) { 1874 struct nfsnode *np = NULL; 1875 1876 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, 1877 cnp->cn_cred, cnp->cn_td, &np); 1878 if (!error) 1879 newvp = NFSTOV(np); 1880 } 1881 if (error) { 1882 if (newvp) 1883 vput(newvp); 1884 } else { 1885 *ap->a_vpp = newvp; 1886 } 1887 VTONFS(dvp)->n_flag |= NMODIFIED; 1888 if (!wccflag) 1889 VTONFS(dvp)->n_attrstamp = 0; 1890 return (error); 1891 } 1892 1893 /* 1894 * nfs make dir call 1895 */ 1896 static int 1897 nfs_mkdir(ap) 1898 struct vop_mkdir_args /* { 1899 struct vnode *a_dvp; 1900 struct vnode **a_vpp; 1901 struct componentname *a_cnp; 1902 struct vattr *a_vap; 1903 } */ *ap; 1904 { 1905 struct vnode *dvp = ap->a_dvp; 1906 struct vattr *vap = ap->a_vap; 1907 struct componentname *cnp = ap->a_cnp; 1908 struct nfsv2_sattr *sp; 1909 u_int32_t *tl; 1910 caddr_t cp; 1911 int32_t t1, t2; 1912 int len; 1913 struct nfsnode *np = (struct nfsnode *)0; 1914 struct vnode *newvp = (struct vnode *)0; 1915 caddr_t bpos, dpos, cp2; 1916 int error = 0, wccflag = NFSV3_WCCRATTR; 1917 int gotvp = 0; 1918 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1919 struct vattr vattr; 1920 int v3 = NFS_ISV3(dvp); 1921 1922 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_td)) != 0) { 1923 return (error); 1924 } 1925 len = cnp->cn_namelen; 1926 nfsstats.rpccnt[NFSPROC_MKDIR]++; 1927 nfsm_reqhead(dvp, NFSPROC_MKDIR, 1928 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); 1929 nfsm_fhtom(dvp, v3); 1930 nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); 1931 if (v3) { 1932 nfsm_v3attrbuild(vap, FALSE); 1933 } else { 1934 nfsm_build(sp, struct nfsv2_sattr *, NFSX_V2SATTR); 1935 sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); 1936 sp->sa_uid = nfs_xdrneg1; 1937 sp->sa_gid = nfs_xdrneg1; 1938 sp->sa_size = nfs_xdrneg1; 1939 txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); 1940 txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); 1941 } 1942 nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_td, cnp->cn_cred); 1943 if (!error) 1944 nfsm_mtofh(dvp, newvp, v3, gotvp); 1945 if (v3) 1946 nfsm_wcc_data(dvp, wccflag); 1947 nfsm_reqdone; 1948 VTONFS(dvp)->n_flag |= NMODIFIED; 1949 if (!wccflag) 1950 VTONFS(dvp)->n_attrstamp = 0; 1951 /* 1952 * Kludge: Map EEXIST => 0 assuming that you have a reply to a retry 1953 * if we can succeed in looking up the directory. 1954 */ 1955 if (error == EEXIST || (!error && !gotvp)) { 1956 if (newvp) { 1957 vrele(newvp); 1958 newvp = (struct vnode *)0; 1959 } 1960 error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, 1961 cnp->cn_td, &np); 1962 if (!error) { 1963 newvp = NFSTOV(np); 1964 if (newvp->v_type != VDIR) 1965 error = EEXIST; 1966 } 1967 } 1968 if (error) { 1969 if (newvp) 1970 vrele(newvp); 1971 } else 1972 *ap->a_vpp = newvp; 1973 return (error); 1974 } 1975 1976 /* 1977 * nfs remove directory call 1978 */ 1979 static int 1980 nfs_rmdir(ap) 1981 struct vop_rmdir_args /* { 1982 struct vnode *a_dvp; 1983 struct vnode *a_vp; 1984 struct componentname *a_cnp; 1985 } */ *ap; 1986 { 1987 struct vnode *vp = ap->a_vp; 1988 struct vnode *dvp = ap->a_dvp; 1989 struct componentname *cnp = ap->a_cnp; 1990 u_int32_t *tl; 1991 caddr_t cp; 1992 int32_t t1, t2; 1993 caddr_t bpos, dpos, cp2; 1994 int error = 0, wccflag = NFSV3_WCCRATTR; 1995 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 1996 int v3 = NFS_ISV3(dvp); 1997 1998 if (dvp == vp) 1999 return (EINVAL); 2000 nfsstats.rpccnt[NFSPROC_RMDIR]++; 2001 nfsm_reqhead(dvp, NFSPROC_RMDIR, 2002 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); 2003 nfsm_fhtom(dvp, v3); 2004 nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); 2005 nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_td, cnp->cn_cred); 2006 if (v3) 2007 nfsm_wcc_data(dvp, wccflag); 2008 nfsm_reqdone; 2009 VTONFS(dvp)->n_flag |= NMODIFIED; 2010 if (!wccflag) 2011 VTONFS(dvp)->n_attrstamp = 0; 2012 cache_purge(dvp); 2013 cache_purge(vp); 2014 /* 2015 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. 2016 */ 2017 if (error == ENOENT) 2018 error = 0; 2019 return (error); 2020 } 2021 2022 /* 2023 * nfs readdir call 2024 */ 2025 static int 2026 nfs_readdir(ap) 2027 struct vop_readdir_args /* { 2028 struct vnode *a_vp; 2029 struct uio *a_uio; 2030 struct ucred *a_cred; 2031 } */ *ap; 2032 { 2033 struct vnode *vp = ap->a_vp; 2034 struct nfsnode *np = VTONFS(vp); 2035 struct uio *uio = ap->a_uio; 2036 int tresid, error; 2037 struct vattr vattr; 2038 2039 if (vp->v_type != VDIR) 2040 return (EPERM); 2041 /* 2042 * First, check for hit on the EOF offset cache 2043 */ 2044 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && 2045 (np->n_flag & NMODIFIED) == 0) { 2046 if (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NQNFS) { 2047 if (NQNFS_CKCACHABLE(vp, ND_READ)) { 2048 nfsstats.direofcache_hits++; 2049 return (0); 2050 } 2051 } else if (VOP_GETATTR(vp, &vattr, uio->uio_td) == 0 && 2052 np->n_mtime == vattr.va_mtime.tv_sec) { 2053 nfsstats.direofcache_hits++; 2054 return (0); 2055 } 2056 } 2057 2058 /* 2059 * Call nfs_bioread() to do the real work. 2060 */ 2061 tresid = uio->uio_resid; 2062 error = nfs_bioread(vp, uio, 0); 2063 2064 if (!error && uio->uio_resid == tresid) 2065 nfsstats.direofcache_misses++; 2066 return (error); 2067 } 2068 2069 /* 2070 * Readdir rpc call. 2071 * Called from below the buffer cache by nfs_doio(). 2072 */ 2073 int 2074 nfs_readdirrpc(struct vnode *vp, struct uio *uiop) 2075 { 2076 int len, left; 2077 struct dirent *dp = NULL; 2078 u_int32_t *tl; 2079 caddr_t cp; 2080 int32_t t1, t2; 2081 nfsuint64 *cookiep; 2082 caddr_t bpos, dpos, cp2; 2083 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2084 nfsuint64 cookie; 2085 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2086 struct nfsnode *dnp = VTONFS(vp); 2087 u_quad_t fileno; 2088 int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; 2089 int attrflag; 2090 int v3 = NFS_ISV3(vp); 2091 2092 #ifndef DIAGNOSTIC 2093 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2094 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2095 panic("nfs readdirrpc bad uio"); 2096 #endif 2097 2098 /* 2099 * If there is no cookie, assume directory was stale. 2100 */ 2101 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2102 if (cookiep) 2103 cookie = *cookiep; 2104 else 2105 return (NFSERR_BAD_COOKIE); 2106 /* 2107 * Loop around doing readdir rpc's of size nm_readdirsize 2108 * truncated to a multiple of DIRBLKSIZ. 2109 * The stopping criteria is EOF or buffer full. 2110 */ 2111 while (more_dirs && bigenough) { 2112 nfsstats.rpccnt[NFSPROC_READDIR]++; 2113 nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + 2114 NFSX_READDIR(v3)); 2115 nfsm_fhtom(vp, v3); 2116 if (v3) { 2117 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 2118 *tl++ = cookie.nfsuquad[0]; 2119 *tl++ = cookie.nfsuquad[1]; 2120 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2121 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2122 } else { 2123 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2124 *tl++ = cookie.nfsuquad[0]; 2125 } 2126 *tl = txdr_unsigned(nmp->nm_readdirsize); 2127 nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, NFSVPCRED(vp)); 2128 if (v3) { 2129 nfsm_postop_attr(vp, attrflag); 2130 if (!error) { 2131 nfsm_dissect(tl, u_int32_t *, 2132 2 * NFSX_UNSIGNED); 2133 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2134 dnp->n_cookieverf.nfsuquad[1] = *tl; 2135 } else { 2136 m_freem(mrep); 2137 goto nfsmout; 2138 } 2139 } 2140 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2141 more_dirs = fxdr_unsigned(int, *tl); 2142 2143 /* loop thru the dir entries, doctoring them to 4bsd form */ 2144 while (more_dirs && bigenough) { 2145 if (v3) { 2146 nfsm_dissect(tl, u_int32_t *, 2147 3 * NFSX_UNSIGNED); 2148 fileno = fxdr_hyper(tl); 2149 len = fxdr_unsigned(int, *(tl + 2)); 2150 } else { 2151 nfsm_dissect(tl, u_int32_t *, 2152 2 * NFSX_UNSIGNED); 2153 fileno = fxdr_unsigned(u_quad_t, *tl++); 2154 len = fxdr_unsigned(int, *tl); 2155 } 2156 if (len <= 0 || len > NFS_MAXNAMLEN) { 2157 error = EBADRPC; 2158 m_freem(mrep); 2159 goto nfsmout; 2160 } 2161 tlen = nfsm_rndup(len); 2162 if (tlen == len) 2163 tlen += 4; /* To ensure null termination */ 2164 left = DIRBLKSIZ - blksiz; 2165 if ((tlen + DIRHDSIZ) > left) { 2166 dp->d_reclen += left; 2167 uiop->uio_iov->iov_base += left; 2168 uiop->uio_iov->iov_len -= left; 2169 uiop->uio_offset += left; 2170 uiop->uio_resid -= left; 2171 blksiz = 0; 2172 } 2173 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2174 bigenough = 0; 2175 if (bigenough) { 2176 dp = (struct dirent *)uiop->uio_iov->iov_base; 2177 dp->d_fileno = (int)fileno; 2178 dp->d_namlen = len; 2179 dp->d_reclen = tlen + DIRHDSIZ; 2180 dp->d_type = DT_UNKNOWN; 2181 blksiz += dp->d_reclen; 2182 if (blksiz == DIRBLKSIZ) 2183 blksiz = 0; 2184 uiop->uio_offset += DIRHDSIZ; 2185 uiop->uio_resid -= DIRHDSIZ; 2186 uiop->uio_iov->iov_base += DIRHDSIZ; 2187 uiop->uio_iov->iov_len -= DIRHDSIZ; 2188 nfsm_mtouio(uiop, len); 2189 cp = uiop->uio_iov->iov_base; 2190 tlen -= len; 2191 *cp = '\0'; /* null terminate */ 2192 uiop->uio_iov->iov_base += tlen; 2193 uiop->uio_iov->iov_len -= tlen; 2194 uiop->uio_offset += tlen; 2195 uiop->uio_resid -= tlen; 2196 } else 2197 nfsm_adv(nfsm_rndup(len)); 2198 if (v3) { 2199 nfsm_dissect(tl, u_int32_t *, 2200 3 * NFSX_UNSIGNED); 2201 } else { 2202 nfsm_dissect(tl, u_int32_t *, 2203 2 * NFSX_UNSIGNED); 2204 } 2205 if (bigenough) { 2206 cookie.nfsuquad[0] = *tl++; 2207 if (v3) 2208 cookie.nfsuquad[1] = *tl++; 2209 } else if (v3) 2210 tl += 2; 2211 else 2212 tl++; 2213 more_dirs = fxdr_unsigned(int, *tl); 2214 } 2215 /* 2216 * If at end of rpc data, get the eof boolean 2217 */ 2218 if (!more_dirs) { 2219 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2220 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2221 } 2222 m_freem(mrep); 2223 } 2224 /* 2225 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2226 * by increasing d_reclen for the last record. 2227 */ 2228 if (blksiz > 0) { 2229 left = DIRBLKSIZ - blksiz; 2230 dp->d_reclen += left; 2231 uiop->uio_iov->iov_base += left; 2232 uiop->uio_iov->iov_len -= left; 2233 uiop->uio_offset += left; 2234 uiop->uio_resid -= left; 2235 } 2236 2237 /* 2238 * We are now either at the end of the directory or have filled the 2239 * block. 2240 */ 2241 if (bigenough) 2242 dnp->n_direofoffset = uiop->uio_offset; 2243 else { 2244 if (uiop->uio_resid > 0) 2245 printf("EEK! readdirrpc resid > 0\n"); 2246 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2247 *cookiep = cookie; 2248 } 2249 nfsmout: 2250 return (error); 2251 } 2252 2253 /* 2254 * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). 2255 */ 2256 int 2257 nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop) 2258 { 2259 int len, left; 2260 struct dirent *dp; 2261 u_int32_t *tl; 2262 caddr_t cp; 2263 int32_t t1, t2; 2264 struct vnode *newvp; 2265 nfsuint64 *cookiep; 2266 caddr_t bpos, dpos, cp2, dpossav1, dpossav2; 2267 struct mbuf *mreq, *mrep, *md, *mb, *mb2, *mdsav1, *mdsav2; 2268 struct nameidata nami, *ndp = &nami; 2269 struct componentname *cnp = &ndp->ni_cnd; 2270 nfsuint64 cookie; 2271 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2272 struct nfsnode *dnp = VTONFS(vp), *np; 2273 nfsfh_t *fhp; 2274 u_quad_t fileno; 2275 int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; 2276 int attrflag, fhsize; 2277 2278 #ifndef nolint 2279 dp = (struct dirent *)0; 2280 #endif 2281 #ifndef DIAGNOSTIC 2282 if (uiop->uio_iovcnt != 1 || (uiop->uio_offset & (DIRBLKSIZ - 1)) || 2283 (uiop->uio_resid & (DIRBLKSIZ - 1))) 2284 panic("nfs readdirplusrpc bad uio"); 2285 #endif 2286 ndp->ni_dvp = vp; 2287 newvp = NULLVP; 2288 2289 /* 2290 * If there is no cookie, assume directory was stale. 2291 */ 2292 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); 2293 if (cookiep) 2294 cookie = *cookiep; 2295 else 2296 return (NFSERR_BAD_COOKIE); 2297 /* 2298 * Loop around doing readdir rpc's of size nm_readdirsize 2299 * truncated to a multiple of DIRBLKSIZ. 2300 * The stopping criteria is EOF or buffer full. 2301 */ 2302 while (more_dirs && bigenough) { 2303 nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; 2304 nfsm_reqhead(vp, NFSPROC_READDIRPLUS, 2305 NFSX_FH(1) + 6 * NFSX_UNSIGNED); 2306 nfsm_fhtom(vp, 1); 2307 nfsm_build(tl, u_int32_t *, 6 * NFSX_UNSIGNED); 2308 *tl++ = cookie.nfsuquad[0]; 2309 *tl++ = cookie.nfsuquad[1]; 2310 *tl++ = dnp->n_cookieverf.nfsuquad[0]; 2311 *tl++ = dnp->n_cookieverf.nfsuquad[1]; 2312 *tl++ = txdr_unsigned(nmp->nm_readdirsize); 2313 *tl = txdr_unsigned(nmp->nm_rsize); 2314 nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, NFSVPCRED(vp)); 2315 nfsm_postop_attr(vp, attrflag); 2316 if (error) { 2317 m_freem(mrep); 2318 goto nfsmout; 2319 } 2320 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2321 dnp->n_cookieverf.nfsuquad[0] = *tl++; 2322 dnp->n_cookieverf.nfsuquad[1] = *tl++; 2323 more_dirs = fxdr_unsigned(int, *tl); 2324 2325 /* loop thru the dir entries, doctoring them to 4bsd form */ 2326 while (more_dirs && bigenough) { 2327 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2328 fileno = fxdr_hyper(tl); 2329 len = fxdr_unsigned(int, *(tl + 2)); 2330 if (len <= 0 || len > NFS_MAXNAMLEN) { 2331 error = EBADRPC; 2332 m_freem(mrep); 2333 goto nfsmout; 2334 } 2335 tlen = nfsm_rndup(len); 2336 if (tlen == len) 2337 tlen += 4; /* To ensure null termination*/ 2338 left = DIRBLKSIZ - blksiz; 2339 if ((tlen + DIRHDSIZ) > left) { 2340 dp->d_reclen += left; 2341 uiop->uio_iov->iov_base += left; 2342 uiop->uio_iov->iov_len -= left; 2343 uiop->uio_offset += left; 2344 uiop->uio_resid -= left; 2345 blksiz = 0; 2346 } 2347 if ((tlen + DIRHDSIZ) > uiop->uio_resid) 2348 bigenough = 0; 2349 if (bigenough) { 2350 dp = (struct dirent *)uiop->uio_iov->iov_base; 2351 dp->d_fileno = (int)fileno; 2352 dp->d_namlen = len; 2353 dp->d_reclen = tlen + DIRHDSIZ; 2354 dp->d_type = DT_UNKNOWN; 2355 blksiz += dp->d_reclen; 2356 if (blksiz == DIRBLKSIZ) 2357 blksiz = 0; 2358 uiop->uio_offset += DIRHDSIZ; 2359 uiop->uio_resid -= DIRHDSIZ; 2360 uiop->uio_iov->iov_base += DIRHDSIZ; 2361 uiop->uio_iov->iov_len -= DIRHDSIZ; 2362 cnp->cn_nameptr = uiop->uio_iov->iov_base; 2363 cnp->cn_namelen = len; 2364 nfsm_mtouio(uiop, len); 2365 cp = uiop->uio_iov->iov_base; 2366 tlen -= len; 2367 *cp = '\0'; 2368 uiop->uio_iov->iov_base += tlen; 2369 uiop->uio_iov->iov_len -= tlen; 2370 uiop->uio_offset += tlen; 2371 uiop->uio_resid -= tlen; 2372 } else 2373 nfsm_adv(nfsm_rndup(len)); 2374 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2375 if (bigenough) { 2376 cookie.nfsuquad[0] = *tl++; 2377 cookie.nfsuquad[1] = *tl++; 2378 } else 2379 tl += 2; 2380 2381 /* 2382 * Since the attributes are before the file handle 2383 * (sigh), we must skip over the attributes and then 2384 * come back and get them. 2385 */ 2386 attrflag = fxdr_unsigned(int, *tl); 2387 if (attrflag) { 2388 dpossav1 = dpos; 2389 mdsav1 = md; 2390 nfsm_adv(NFSX_V3FATTR); 2391 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2392 doit = fxdr_unsigned(int, *tl); 2393 if (doit) { 2394 nfsm_getfh(fhp, fhsize, 1); 2395 if (NFS_CMPFH(dnp, fhp, fhsize)) { 2396 VREF(vp); 2397 newvp = vp; 2398 np = dnp; 2399 } else { 2400 error = nfs_nget(vp->v_mount, fhp, 2401 fhsize, &np); 2402 if (error) 2403 doit = 0; 2404 else 2405 newvp = NFSTOV(np); 2406 } 2407 } 2408 if (doit && bigenough) { 2409 dpossav2 = dpos; 2410 dpos = dpossav1; 2411 mdsav2 = md; 2412 md = mdsav1; 2413 nfsm_loadattr(newvp, (struct vattr *)0); 2414 dpos = dpossav2; 2415 md = mdsav2; 2416 dp->d_type = 2417 IFTODT(VTTOIF(np->n_vattr.va_type)); 2418 ndp->ni_vp = newvp; 2419 cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp); 2420 } 2421 } else { 2422 /* Just skip over the file handle */ 2423 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2424 i = fxdr_unsigned(int, *tl); 2425 nfsm_adv(nfsm_rndup(i)); 2426 } 2427 if (newvp != NULLVP) { 2428 if (newvp == vp) 2429 vrele(newvp); 2430 else 2431 vput(newvp); 2432 newvp = NULLVP; 2433 } 2434 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2435 more_dirs = fxdr_unsigned(int, *tl); 2436 } 2437 /* 2438 * If at end of rpc data, get the eof boolean 2439 */ 2440 if (!more_dirs) { 2441 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2442 more_dirs = (fxdr_unsigned(int, *tl) == 0); 2443 } 2444 m_freem(mrep); 2445 } 2446 /* 2447 * Fill last record, iff any, out to a multiple of DIRBLKSIZ 2448 * by increasing d_reclen for the last record. 2449 */ 2450 if (blksiz > 0) { 2451 left = DIRBLKSIZ - blksiz; 2452 dp->d_reclen += left; 2453 uiop->uio_iov->iov_base += left; 2454 uiop->uio_iov->iov_len -= left; 2455 uiop->uio_offset += left; 2456 uiop->uio_resid -= left; 2457 } 2458 2459 /* 2460 * We are now either at the end of the directory or have filled the 2461 * block. 2462 */ 2463 if (bigenough) 2464 dnp->n_direofoffset = uiop->uio_offset; 2465 else { 2466 if (uiop->uio_resid > 0) 2467 printf("EEK! readdirplusrpc resid > 0\n"); 2468 cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); 2469 *cookiep = cookie; 2470 } 2471 nfsmout: 2472 if (newvp != NULLVP) { 2473 if (newvp == vp) 2474 vrele(newvp); 2475 else 2476 vput(newvp); 2477 newvp = NULLVP; 2478 } 2479 return (error); 2480 } 2481 2482 /* 2483 * Silly rename. To make the NFS filesystem that is stateless look a little 2484 * more like the "ufs" a remove of an active vnode is translated to a rename 2485 * to a funny looking filename that is removed by nfs_inactive on the 2486 * nfsnode. There is the potential for another process on a different client 2487 * to create the same funny name between the nfs_lookitup() fails and the 2488 * nfs_rename() completes, but... 2489 */ 2490 static int 2491 nfs_sillyrename(dvp, vp, cnp) 2492 struct vnode *dvp, *vp; 2493 struct componentname *cnp; 2494 { 2495 struct sillyrename *sp; 2496 struct nfsnode *np; 2497 int error; 2498 2499 cache_purge(dvp); 2500 np = VTONFS(vp); 2501 #ifndef DIAGNOSTIC 2502 if (vp->v_type == VDIR) 2503 panic("nfs: sillyrename dir"); 2504 #endif 2505 MALLOC(sp, struct sillyrename *, sizeof (struct sillyrename), 2506 M_NFSREQ, M_WAITOK); 2507 sp->s_cred = crdup(cnp->cn_cred); 2508 sp->s_dvp = dvp; 2509 VREF(dvp); 2510 2511 /* Fudge together a funny name */ 2512 sp->s_namlen = sprintf(sp->s_name, ".nfsA%08x4.4", (int)cnp->cn_td); 2513 2514 /* Try lookitups until we get one that isn't there */ 2515 while (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2516 cnp->cn_td, (struct nfsnode **)0) == 0) { 2517 sp->s_name[4]++; 2518 if (sp->s_name[4] > 'z') { 2519 error = EINVAL; 2520 goto bad; 2521 } 2522 } 2523 error = nfs_renameit(dvp, cnp, sp); 2524 if (error) 2525 goto bad; 2526 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, 2527 cnp->cn_td, &np); 2528 np->n_sillyrename = sp; 2529 return (0); 2530 bad: 2531 vrele(sp->s_dvp); 2532 crfree(sp->s_cred); 2533 free((caddr_t)sp, M_NFSREQ); 2534 return (error); 2535 } 2536 2537 /* 2538 * Look up a file name and optionally either update the file handle or 2539 * allocate an nfsnode, depending on the value of npp. 2540 * npp == NULL --> just do the lookup 2541 * *npp == NULL --> allocate a new nfsnode and make sure attributes are 2542 * handled too 2543 * *npp != NULL --> update the file handle in the vnode 2544 */ 2545 static int 2546 nfs_lookitup(dvp, name, len, cred, td, npp) 2547 struct vnode *dvp; 2548 const char *name; 2549 int len; 2550 struct ucred *cred; 2551 struct thread *td; 2552 struct nfsnode **npp; 2553 { 2554 u_int32_t *tl; 2555 caddr_t cp; 2556 int32_t t1, t2; 2557 struct vnode *newvp = (struct vnode *)0; 2558 struct nfsnode *np, *dnp = VTONFS(dvp); 2559 caddr_t bpos, dpos, cp2; 2560 int error = 0, fhlen, attrflag; 2561 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2562 nfsfh_t *nfhp; 2563 int v3 = NFS_ISV3(dvp); 2564 2565 nfsstats.rpccnt[NFSPROC_LOOKUP]++; 2566 nfsm_reqhead(dvp, NFSPROC_LOOKUP, 2567 NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); 2568 nfsm_fhtom(dvp, v3); 2569 nfsm_strtom(name, len, NFS_MAXNAMLEN); 2570 nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); 2571 if (npp && !error) { 2572 nfsm_getfh(nfhp, fhlen, v3); 2573 if (*npp) { 2574 np = *npp; 2575 if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { 2576 free((caddr_t)np->n_fhp, M_NFSBIGFH); 2577 np->n_fhp = &np->n_fh; 2578 } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) 2579 np->n_fhp =(nfsfh_t *)malloc(fhlen,M_NFSBIGFH,M_WAITOK); 2580 bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); 2581 np->n_fhsize = fhlen; 2582 newvp = NFSTOV(np); 2583 } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { 2584 VREF(dvp); 2585 newvp = dvp; 2586 } else { 2587 error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np); 2588 if (error) { 2589 m_freem(mrep); 2590 return (error); 2591 } 2592 newvp = NFSTOV(np); 2593 } 2594 if (v3) { 2595 nfsm_postop_attr(newvp, attrflag); 2596 if (!attrflag && *npp == NULL) { 2597 m_freem(mrep); 2598 if (newvp == dvp) 2599 vrele(newvp); 2600 else 2601 vput(newvp); 2602 return (ENOENT); 2603 } 2604 } else 2605 nfsm_loadattr(newvp, (struct vattr *)0); 2606 } 2607 nfsm_reqdone; 2608 if (npp && *npp == NULL) { 2609 if (error) { 2610 if (newvp) { 2611 if (newvp == dvp) 2612 vrele(newvp); 2613 else 2614 vput(newvp); 2615 } 2616 } else 2617 *npp = np; 2618 } 2619 return (error); 2620 } 2621 2622 /* 2623 * Nfs Version 3 commit rpc 2624 */ 2625 int 2626 nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct thread *td) 2627 { 2628 caddr_t cp; 2629 u_int32_t *tl; 2630 int32_t t1, t2; 2631 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2632 caddr_t bpos, dpos, cp2; 2633 int error = 0, wccflag = NFSV3_WCCRATTR; 2634 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 2635 2636 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) 2637 return (0); 2638 nfsstats.rpccnt[NFSPROC_COMMIT]++; 2639 nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); 2640 nfsm_fhtom(vp, 1); 2641 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2642 txdr_hyper(offset, tl); 2643 tl += 2; 2644 *tl = txdr_unsigned(cnt); 2645 nfsm_request(vp, NFSPROC_COMMIT, td, NFSVPCRED(vp)); 2646 nfsm_wcc_data(vp, wccflag); 2647 if (!error) { 2648 nfsm_dissect(tl, u_int32_t *, NFSX_V3WRITEVERF); 2649 if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, 2650 NFSX_V3WRITEVERF)) { 2651 bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, 2652 NFSX_V3WRITEVERF); 2653 error = NFSERR_STALEWRITEVERF; 2654 } 2655 } 2656 nfsm_reqdone; 2657 return (error); 2658 } 2659 2660 /* 2661 * Kludge City.. 2662 * - make nfs_bmap() essentially a no-op that does no translation 2663 * - do nfs_strategy() by doing I/O with nfs_readrpc/nfs_writerpc 2664 * (Maybe I could use the process's page mapping, but I was concerned that 2665 * Kernel Write might not be enabled and also figured copyout() would do 2666 * a lot more work than bcopy() and also it currently happens in the 2667 * context of the swapper process (2). 2668 */ 2669 static int 2670 nfs_bmap(ap) 2671 struct vop_bmap_args /* { 2672 struct vnode *a_vp; 2673 daddr_t a_bn; 2674 struct vnode **a_vpp; 2675 daddr_t *a_bnp; 2676 int *a_runp; 2677 int *a_runb; 2678 } */ *ap; 2679 { 2680 struct vnode *vp = ap->a_vp; 2681 2682 if (ap->a_vpp != NULL) 2683 *ap->a_vpp = vp; 2684 if (ap->a_bnp != NULL) 2685 *ap->a_bnp = ap->a_bn * btodb(vp->v_mount->mnt_stat.f_iosize); 2686 if (ap->a_runp != NULL) 2687 *ap->a_runp = 0; 2688 if (ap->a_runb != NULL) 2689 *ap->a_runb = 0; 2690 return (0); 2691 } 2692 2693 /* 2694 * Strategy routine. 2695 * For async requests when nfsiod(s) are running, queue the request by 2696 * calling nfs_asyncio(), otherwise just all nfs_doio() to do the 2697 * request. 2698 */ 2699 static int 2700 nfs_strategy(ap) 2701 struct vop_strategy_args *ap; 2702 { 2703 struct buf *bp = ap->a_bp; 2704 struct thread *td; 2705 int error = 0; 2706 2707 KASSERT(!(bp->b_flags & B_DONE), ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); 2708 KASSERT(BUF_REFCNT(bp) > 0, ("nfs_strategy: buffer %p not locked", bp)); 2709 2710 if (bp->b_flags & B_PHYS) 2711 panic("nfs physio"); 2712 2713 if (bp->b_flags & B_ASYNC) 2714 td = NULL; 2715 else 2716 td = curthread; /* XXX */ 2717 2718 /* 2719 * If the op is asynchronous and an i/o daemon is waiting 2720 * queue the request, wake it up and wait for completion 2721 * otherwise just do it ourselves. 2722 */ 2723 if ((bp->b_flags & B_ASYNC) == 0 || 2724 nfs_asyncio(bp, td)) 2725 error = nfs_doio(bp, td); 2726 return (error); 2727 } 2728 2729 /* 2730 * Mmap a file 2731 * 2732 * NB Currently unsupported. 2733 */ 2734 /* ARGSUSED */ 2735 static int 2736 nfs_mmap(ap) 2737 struct vop_mmap_args /* { 2738 struct vnode *a_vp; 2739 int a_fflags; 2740 struct ucred *a_cred; 2741 struct thread *a_td; 2742 } */ *ap; 2743 { 2744 2745 return (EINVAL); 2746 } 2747 2748 /* 2749 * fsync vnode op. Just call nfs_flush() with commit == 1. 2750 */ 2751 /* ARGSUSED */ 2752 static int 2753 nfs_fsync(ap) 2754 struct vop_fsync_args /* { 2755 struct vnodeop_desc *a_desc; 2756 struct vnode * a_vp; 2757 struct ucred * a_cred; 2758 int a_waitfor; 2759 struct thread * a_td; 2760 } */ *ap; 2761 { 2762 2763 return (nfs_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1)); 2764 } 2765 2766 /* 2767 * Flush all the blocks associated with a vnode. 2768 * Walk through the buffer pool and push any dirty pages 2769 * associated with the vnode. 2770 */ 2771 static int 2772 nfs_flush(vp, waitfor, td, commit) 2773 struct vnode *vp; 2774 int waitfor; 2775 struct thread *td; 2776 int commit; 2777 { 2778 struct nfsnode *np = VTONFS(vp); 2779 struct buf *bp; 2780 int i; 2781 struct buf *nbp; 2782 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 2783 int s, error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; 2784 int passone = 1; 2785 u_quad_t off, endoff, toff; 2786 struct buf **bvec = NULL; 2787 #ifndef NFS_COMMITBVECSIZ 2788 #define NFS_COMMITBVECSIZ 20 2789 #endif 2790 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; 2791 int bvecsize = 0, bveccount; 2792 2793 if (nmp->nm_flag & NFSMNT_INT) 2794 slpflag = PCATCH; 2795 if (!commit) 2796 passone = 0; 2797 /* 2798 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the 2799 * server, but nas not been committed to stable storage on the server 2800 * yet. On the first pass, the byte range is worked out and the commit 2801 * rpc is done. On the second pass, nfs_writebp() is called to do the 2802 * job. 2803 */ 2804 again: 2805 off = (u_quad_t)-1; 2806 endoff = 0; 2807 bvecpos = 0; 2808 if (NFS_ISV3(vp) && commit) { 2809 s = splbio(); 2810 /* 2811 * Count up how many buffers waiting for a commit. 2812 */ 2813 bveccount = 0; 2814 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2815 nbp = TAILQ_NEXT(bp, b_vnbufs); 2816 if (BUF_REFCNT(bp) == 0 && 2817 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) 2818 == (B_DELWRI | B_NEEDCOMMIT)) 2819 bveccount++; 2820 } 2821 /* 2822 * Allocate space to remember the list of bufs to commit. It is 2823 * important to use M_NOWAIT here to avoid a race with nfs_write. 2824 * If we can't get memory (for whatever reason), we will end up 2825 * committing the buffers one-by-one in the loop below. 2826 */ 2827 if (bvec != NULL && bvec != bvec_on_stack) 2828 free(bvec, M_TEMP); 2829 if (bveccount > NFS_COMMITBVECSIZ) { 2830 bvec = (struct buf **) 2831 malloc(bveccount * sizeof(struct buf *), 2832 M_TEMP, M_NOWAIT); 2833 if (bvec == NULL) { 2834 bvec = bvec_on_stack; 2835 bvecsize = NFS_COMMITBVECSIZ; 2836 } else 2837 bvecsize = bveccount; 2838 } else { 2839 bvec = bvec_on_stack; 2840 bvecsize = NFS_COMMITBVECSIZ; 2841 } 2842 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2843 nbp = TAILQ_NEXT(bp, b_vnbufs); 2844 if (bvecpos >= bvecsize) 2845 break; 2846 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != 2847 (B_DELWRI | B_NEEDCOMMIT) || 2848 BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) 2849 continue; 2850 bremfree(bp); 2851 /* 2852 * NOTE: we are not clearing B_DONE here, so we have 2853 * to do it later on in this routine if we intend to 2854 * initiate I/O on the bp. 2855 * 2856 * Note: to avoid loopback deadlocks, we do not 2857 * assign b_runningbufspace. 2858 */ 2859 bp->b_flags |= B_WRITEINPROG; 2860 vfs_busy_pages(bp, 1); 2861 2862 /* 2863 * bp is protected by being locked, but nbp is not 2864 * and vfs_busy_pages() may sleep. We have to 2865 * recalculate nbp. 2866 */ 2867 nbp = TAILQ_NEXT(bp, b_vnbufs); 2868 2869 /* 2870 * A list of these buffers is kept so that the 2871 * second loop knows which buffers have actually 2872 * been committed. This is necessary, since there 2873 * may be a race between the commit rpc and new 2874 * uncommitted writes on the file. 2875 */ 2876 bvec[bvecpos++] = bp; 2877 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + 2878 bp->b_dirtyoff; 2879 if (toff < off) 2880 off = toff; 2881 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); 2882 if (toff > endoff) 2883 endoff = toff; 2884 } 2885 splx(s); 2886 } 2887 if (bvecpos > 0) { 2888 /* 2889 * Commit data on the server, as required. Note that 2890 * nfs_commit will use the vnode's cred for the commit. 2891 */ 2892 retv = nfs_commit(vp, off, (int)(endoff - off), td); 2893 2894 if (retv == NFSERR_STALEWRITEVERF) 2895 nfs_clearcommit(vp->v_mount); 2896 2897 /* 2898 * Now, either mark the blocks I/O done or mark the 2899 * blocks dirty, depending on whether the commit 2900 * succeeded. 2901 */ 2902 for (i = 0; i < bvecpos; i++) { 2903 bp = bvec[i]; 2904 bp->b_flags &= ~(B_NEEDCOMMIT | B_WRITEINPROG | B_CLUSTEROK); 2905 if (retv) { 2906 /* 2907 * Error, leave B_DELWRI intact 2908 */ 2909 vfs_unbusy_pages(bp); 2910 brelse(bp); 2911 } else { 2912 /* 2913 * Success, remove B_DELWRI ( bundirty() ). 2914 * 2915 * b_dirtyoff/b_dirtyend seem to be NFS 2916 * specific. We should probably move that 2917 * into bundirty(). XXX 2918 */ 2919 s = splbio(); 2920 vp->v_numoutput++; 2921 bp->b_flags |= B_ASYNC; 2922 bundirty(bp); 2923 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 2924 bp->b_dirtyoff = bp->b_dirtyend = 0; 2925 splx(s); 2926 biodone(bp); 2927 } 2928 } 2929 } 2930 2931 /* 2932 * Start/do any write(s) that are required. 2933 */ 2934 loop: 2935 s = splbio(); 2936 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 2937 nbp = TAILQ_NEXT(bp, b_vnbufs); 2938 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 2939 if (waitfor != MNT_WAIT || passone) 2940 continue; 2941 error = BUF_TIMELOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL, 2942 "nfsfsync", slpflag, slptimeo); 2943 splx(s); 2944 if (error == 0) 2945 panic("nfs_fsync: inconsistent lock"); 2946 if (error == ENOLCK) 2947 goto loop; 2948 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2949 error = EINTR; 2950 goto done; 2951 } 2952 if (slpflag == PCATCH) { 2953 slpflag = 0; 2954 slptimeo = 2 * hz; 2955 } 2956 goto loop; 2957 } 2958 if ((bp->b_flags & B_DELWRI) == 0) 2959 panic("nfs_fsync: not dirty"); 2960 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { 2961 BUF_UNLOCK(bp); 2962 continue; 2963 } 2964 bremfree(bp); 2965 if (passone || !commit) 2966 bp->b_flags |= B_ASYNC; 2967 else 2968 bp->b_flags |= B_ASYNC | B_WRITEINPROG; 2969 splx(s); 2970 VOP_BWRITE(bp->b_vp, bp); 2971 goto loop; 2972 } 2973 splx(s); 2974 if (passone) { 2975 passone = 0; 2976 goto again; 2977 } 2978 if (waitfor == MNT_WAIT) { 2979 while (vp->v_numoutput) { 2980 vp->v_flag |= VBWAIT; 2981 error = tsleep((caddr_t)&vp->v_numoutput, 2982 slpflag, "nfsfsync", slptimeo); 2983 if (error) { 2984 if (nfs_sigintr(nmp, (struct nfsreq *)0, td)) { 2985 error = EINTR; 2986 goto done; 2987 } 2988 if (slpflag == PCATCH) { 2989 slpflag = 0; 2990 slptimeo = 2 * hz; 2991 } 2992 } 2993 } 2994 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) && commit) { 2995 goto loop; 2996 } 2997 } 2998 if (np->n_flag & NWRITEERR) { 2999 error = np->n_error; 3000 np->n_flag &= ~NWRITEERR; 3001 } 3002 done: 3003 if (bvec != NULL && bvec != bvec_on_stack) 3004 free(bvec, M_TEMP); 3005 return (error); 3006 } 3007 3008 /* 3009 * NFS advisory byte-level locks. 3010 * Currently unsupported. 3011 */ 3012 static int 3013 nfs_advlock(ap) 3014 struct vop_advlock_args /* { 3015 struct vnode *a_vp; 3016 caddr_t a_id; 3017 int a_op; 3018 struct flock *a_fl; 3019 int a_flags; 3020 } */ *ap; 3021 { 3022 struct nfsnode *np = VTONFS(ap->a_vp); 3023 3024 /* 3025 * The following kludge is to allow diskless support to work 3026 * until a real NFS lockd is implemented. Basically, just pretend 3027 * that this is a local lock. 3028 */ 3029 return (lf_advlock(ap, &(np->n_lockf), np->n_size)); 3030 } 3031 3032 /* 3033 * Print out the contents of an nfsnode. 3034 */ 3035 static int 3036 nfs_print(ap) 3037 struct vop_print_args /* { 3038 struct vnode *a_vp; 3039 } */ *ap; 3040 { 3041 struct vnode *vp = ap->a_vp; 3042 struct nfsnode *np = VTONFS(vp); 3043 3044 printf("tag VT_NFS, fileid %ld fsid 0x%x", 3045 np->n_vattr.va_fileid, np->n_vattr.va_fsid); 3046 if (vp->v_type == VFIFO) 3047 fifo_printinfo(vp); 3048 printf("\n"); 3049 return (0); 3050 } 3051 3052 /* 3053 * Just call nfs_writebp() with the force argument set to 1. 3054 * 3055 * NOTE: B_DONE may or may not be set in a_bp on call. 3056 */ 3057 static int 3058 nfs_bwrite(ap) 3059 struct vop_bwrite_args /* { 3060 struct vnode *a_bp; 3061 } */ *ap; 3062 { 3063 return (nfs_writebp(ap->a_bp, 1, curthread)); 3064 } 3065 3066 /* 3067 * This is a clone of vn_bwrite(), except that B_WRITEINPROG isn't set unless 3068 * the force flag is one and it also handles the B_NEEDCOMMIT flag. We set 3069 * B_CACHE if this is a VMIO buffer. 3070 */ 3071 int 3072 nfs_writebp(bp, force, td) 3073 struct buf *bp; 3074 int force; 3075 struct thread *td; 3076 { 3077 int s; 3078 int oldflags = bp->b_flags; 3079 #if 0 3080 int retv = 1; 3081 off_t off; 3082 #endif 3083 3084 if (BUF_REFCNT(bp) == 0) 3085 panic("bwrite: buffer is not locked???"); 3086 3087 if (bp->b_flags & B_INVAL) { 3088 brelse(bp); 3089 return(0); 3090 } 3091 3092 bp->b_flags |= B_CACHE; 3093 3094 /* 3095 * Undirty the bp. We will redirty it later if the I/O fails. 3096 */ 3097 3098 s = splbio(); 3099 bundirty(bp); 3100 bp->b_flags &= ~(B_READ|B_DONE|B_ERROR); 3101 3102 bp->b_vp->v_numoutput++; 3103 splx(s); 3104 3105 /* 3106 * Note: to avoid loopback deadlocks, we do not 3107 * assign b_runningbufspace. 3108 */ 3109 vfs_busy_pages(bp, 1); 3110 3111 if (force) 3112 bp->b_flags |= B_WRITEINPROG; 3113 BUF_KERNPROC(bp); 3114 VOP_STRATEGY(bp->b_vp, bp); 3115 3116 if( (oldflags & B_ASYNC) == 0) { 3117 int rtval = biowait(bp); 3118 3119 if (oldflags & B_DELWRI) { 3120 s = splbio(); 3121 reassignbuf(bp, bp->b_vp); 3122 splx(s); 3123 } 3124 3125 brelse(bp); 3126 return (rtval); 3127 } 3128 3129 return (0); 3130 } 3131 3132 /* 3133 * nfs special file access vnode op. 3134 * Essentially just get vattr and then imitate iaccess() since the device is 3135 * local to the client. 3136 */ 3137 static int 3138 nfsspec_access(ap) 3139 struct vop_access_args /* { 3140 struct vnode *a_vp; 3141 int a_mode; 3142 struct ucred *a_cred; 3143 struct thread *a_td; 3144 } */ *ap; 3145 { 3146 struct vattr *vap; 3147 gid_t *gp; 3148 struct ucred *cred = ap->a_cred; 3149 struct vnode *vp = ap->a_vp; 3150 mode_t mode = ap->a_mode; 3151 struct vattr vattr; 3152 int i; 3153 int error; 3154 3155 /* 3156 * Disallow write attempts on filesystems mounted read-only; 3157 * unless the file is a socket, fifo, or a block or character 3158 * device resident on the filesystem. 3159 */ 3160 if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { 3161 switch (vp->v_type) { 3162 case VREG: 3163 case VDIR: 3164 case VLNK: 3165 return (EROFS); 3166 default: 3167 break; 3168 } 3169 } 3170 /* 3171 * If you're the super-user, 3172 * you always get access. 3173 */ 3174 if (cred->cr_uid == 0) 3175 return (0); 3176 vap = &vattr; 3177 error = VOP_GETATTR(vp, vap, ap->a_td); 3178 if (error) 3179 return (error); 3180 /* 3181 * Access check is based on only one of owner, group, public. 3182 * If not owner, then check group. If not a member of the 3183 * group, then check public access. 3184 */ 3185 if (cred->cr_uid != vap->va_uid) { 3186 mode >>= 3; 3187 gp = cred->cr_groups; 3188 for (i = 0; i < cred->cr_ngroups; i++, gp++) 3189 if (vap->va_gid == *gp) 3190 goto found; 3191 mode >>= 3; 3192 found: 3193 ; 3194 } 3195 error = (vap->va_mode & mode) == mode ? 0 : EACCES; 3196 return (error); 3197 } 3198 3199 /* 3200 * Read wrapper for special devices. 3201 */ 3202 static int 3203 nfsspec_read(ap) 3204 struct vop_read_args /* { 3205 struct vnode *a_vp; 3206 struct uio *a_uio; 3207 int a_ioflag; 3208 struct ucred *a_cred; 3209 } */ *ap; 3210 { 3211 struct nfsnode *np = VTONFS(ap->a_vp); 3212 3213 /* 3214 * Set access flag. 3215 */ 3216 np->n_flag |= NACC; 3217 getnanotime(&np->n_atim); 3218 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_read), ap)); 3219 } 3220 3221 /* 3222 * Write wrapper for special devices. 3223 */ 3224 static int 3225 nfsspec_write(ap) 3226 struct vop_write_args /* { 3227 struct vnode *a_vp; 3228 struct uio *a_uio; 3229 int a_ioflag; 3230 struct ucred *a_cred; 3231 } */ *ap; 3232 { 3233 struct nfsnode *np = VTONFS(ap->a_vp); 3234 3235 /* 3236 * Set update flag. 3237 */ 3238 np->n_flag |= NUPD; 3239 getnanotime(&np->n_mtim); 3240 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_write), ap)); 3241 } 3242 3243 /* 3244 * Close wrapper for special devices. 3245 * 3246 * Update the times on the nfsnode then do device close. 3247 */ 3248 static int 3249 nfsspec_close(ap) 3250 struct vop_close_args /* { 3251 struct vnode *a_vp; 3252 int a_fflag; 3253 struct ucred *a_cred; 3254 struct thread *a_td; 3255 } */ *ap; 3256 { 3257 struct vnode *vp = ap->a_vp; 3258 struct nfsnode *np = VTONFS(vp); 3259 struct vattr vattr; 3260 3261 if (np->n_flag & (NACC | NUPD)) { 3262 np->n_flag |= NCHG; 3263 if (vp->v_usecount == 1 && 3264 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3265 VATTR_NULL(&vattr); 3266 if (np->n_flag & NACC) 3267 vattr.va_atime = np->n_atim; 3268 if (np->n_flag & NUPD) 3269 vattr.va_mtime = np->n_mtim; 3270 (void)VOP_SETATTR(vp, &vattr, NFSVPCRED(vp), ap->a_td); 3271 } 3272 } 3273 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_close), ap)); 3274 } 3275 3276 /* 3277 * Read wrapper for fifos. 3278 */ 3279 static int 3280 nfsfifo_read(ap) 3281 struct vop_read_args /* { 3282 struct vnode *a_vp; 3283 struct uio *a_uio; 3284 int a_ioflag; 3285 struct ucred *a_cred; 3286 } */ *ap; 3287 { 3288 struct nfsnode *np = VTONFS(ap->a_vp); 3289 3290 /* 3291 * Set access flag. 3292 */ 3293 np->n_flag |= NACC; 3294 getnanotime(&np->n_atim); 3295 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_read), ap)); 3296 } 3297 3298 /* 3299 * Write wrapper for fifos. 3300 */ 3301 static int 3302 nfsfifo_write(ap) 3303 struct vop_write_args /* { 3304 struct vnode *a_vp; 3305 struct uio *a_uio; 3306 int a_ioflag; 3307 struct ucred *a_cred; 3308 } */ *ap; 3309 { 3310 struct nfsnode *np = VTONFS(ap->a_vp); 3311 3312 /* 3313 * Set update flag. 3314 */ 3315 np->n_flag |= NUPD; 3316 getnanotime(&np->n_mtim); 3317 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_write), ap)); 3318 } 3319 3320 /* 3321 * Close wrapper for fifos. 3322 * 3323 * Update the times on the nfsnode then do fifo close. 3324 */ 3325 static int 3326 nfsfifo_close(ap) 3327 struct vop_close_args /* { 3328 struct vnode *a_vp; 3329 int a_fflag; 3330 struct thread *a_td; 3331 } */ *ap; 3332 { 3333 struct vnode *vp = ap->a_vp; 3334 struct nfsnode *np = VTONFS(vp); 3335 struct vattr vattr; 3336 struct timespec ts; 3337 3338 if (np->n_flag & (NACC | NUPD)) { 3339 getnanotime(&ts); 3340 if (np->n_flag & NACC) 3341 np->n_atim = ts; 3342 if (np->n_flag & NUPD) 3343 np->n_mtim = ts; 3344 np->n_flag |= NCHG; 3345 if (vp->v_usecount == 1 && 3346 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { 3347 VATTR_NULL(&vattr); 3348 if (np->n_flag & NACC) 3349 vattr.va_atime = np->n_atim; 3350 if (np->n_flag & NUPD) 3351 vattr.va_mtime = np->n_mtim; 3352 (void)VOP_SETATTR(vp, &vattr, NFSVPCRED(vp), ap->a_td); 3353 } 3354 } 3355 return (VOCALL(fifo_vnodeop_p, VOFFSET(vop_close), ap)); 3356 } 3357 3358