nfs_vfsops.c revision 1.30
1 /* $NetBSD: nfs_vfsops.c,v 1.30 1994/08/14 03:35:27 gwr Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_vfsops.c 8.3 (Berkeley) 1/4/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/conf.h> 43 #include <sys/ioctl.h> 44 #include <sys/signal.h> 45 #include <sys/proc.h> 46 #include <sys/namei.h> 47 #include <sys/vnode.h> 48 #include <sys/kernel.h> 49 #include <sys/mount.h> 50 #include <sys/buf.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/systm.h> 54 55 #include <net/if.h> 56 #include <net/route.h> 57 #include <netinet/in.h> 58 59 #include <nfs/rpcv2.h> 60 #include <nfs/nfsv2.h> 61 #include <nfs/nfsnode.h> 62 #include <nfs/nfsmount.h> 63 #include <nfs/nfs.h> 64 #include <nfs/xdr_subs.h> 65 #include <nfs/nfsm_subs.h> 66 #include <nfs/nfsdiskless.h> 67 #include <nfs/nqnfs.h> 68 69 /* 70 * nfs vfs operations. 71 */ 72 struct vfsops nfs_vfsops = { 73 MOUNT_NFS, 74 nfs_mount, 75 nfs_start, 76 nfs_unmount, 77 nfs_root, 78 nfs_quotactl, 79 nfs_statfs, 80 nfs_sync, 81 nfs_vget, 82 nfs_fhtovp, 83 nfs_vptofh, 84 nfs_init, 85 }; 86 87 extern u_long nfs_procids[NFS_NPROCS]; 88 extern u_long nfs_prog, nfs_vers; 89 void nfs_disconnect __P((struct nfsmount *)); 90 91 static struct mount * 92 nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); 93 94 #define TRUE 1 95 #define FALSE 0 96 97 /* 98 * nfs statfs call 99 */ 100 int 101 nfs_statfs(mp, sbp, p) 102 struct mount *mp; 103 register struct statfs *sbp; 104 struct proc *p; 105 { 106 register struct vnode *vp; 107 register struct nfsv2_statfs *sfp; 108 register caddr_t cp; 109 register long t1; 110 caddr_t bpos, dpos, cp2; 111 int error = 0, isnq; 112 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 113 struct nfsmount *nmp; 114 struct ucred *cred; 115 struct nfsnode *np; 116 117 nmp = VFSTONFS(mp); 118 isnq = (nmp->nm_flag & NFSMNT_NQNFS); 119 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 120 return (error); 121 vp = NFSTOV(np); 122 nfsstats.rpccnt[NFSPROC_STATFS]++; 123 cred = crget(); 124 cred->cr_ngroups = 1; 125 nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH); 126 nfsm_fhtom(vp); 127 nfsm_request(vp, NFSPROC_STATFS, p, cred); 128 nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq)); 129 #ifdef COMPAT_09 130 sbp->f_type = 2; 131 #else 132 sbp->f_type = 0; 133 #endif 134 sbp->f_flags = nmp->nm_flag; 135 sbp->f_iosize = NFS_MAXDGRAMDATA; 136 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); 137 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 138 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 139 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 140 if (isnq) { 141 sbp->f_files = fxdr_unsigned(long, sfp->sf_files); 142 sbp->f_ffree = fxdr_unsigned(long, sfp->sf_ffree); 143 } else { 144 sbp->f_files = 0; 145 sbp->f_ffree = 0; 146 } 147 if (sbp != &mp->mnt_stat) { 148 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 149 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 150 } 151 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 152 sbp->f_fstypename[MFSNAMELEN] = '\0'; 153 nfsm_reqdone; 154 vrele(vp); 155 crfree(cred); 156 return (error); 157 } 158 159 /* 160 * Mount a remote root fs via. NFS. It goes like this: 161 * - Call nfs_boot_init() to fill in the nfs_diskless struct 162 * (using RARP, bootparam RPC, mountd RPC) 163 * - hand craft the swap nfs vnode hanging off a fake mount point 164 * if swdevt[0].sw_dev == NODEV 165 * - build the rootfs mount point and call mountnfs() to do the rest. 166 */ 167 int 168 nfs_mountroot() 169 { 170 struct nfs_diskless nd; 171 struct vattr attr; 172 struct mount *mp; 173 struct vnode *vp; 174 struct proc *procp; 175 struct ucred *cred; 176 long n; 177 int error; 178 179 procp = curproc; /* XXX */ 180 181 /* 182 * XXX time must be non-zero when we init the interface or else 183 * the arp code will wedge. [Fixed now in if_ether.c] 184 * However, the NFS attribute cache gives false "hits" when 185 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 186 */ 187 if (time.tv_sec < NFS_MAXATTRTIMO) 188 time.tv_sec = NFS_MAXATTRTIMO; 189 190 /* 191 * Call nfs_boot_init() to fill in the nfs_diskless struct. 192 * Side effect: Finds and configures a network interface. 193 */ 194 bzero((caddr_t) &nd, sizeof(nd)); 195 nfs_boot_init(&nd, procp); 196 197 /* 198 * Create the root mount point. 199 */ 200 mp = nfs_mount_diskless(&nd.nd_root, "/", MNT_RDONLY, &vp); 201 202 /* 203 * Link it into the mount list. 204 */ 205 if (vfs_lock(mp)) 206 panic("nfs_mountroot: vfs_lock"); 207 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 208 mp->mnt_flag |= MNT_ROOTFS; 209 mp->mnt_vnodecovered = NULLVP; 210 vfs_unlock(mp); 211 rootvp = vp; 212 213 214 /* Get root attributes (for the time). */ 215 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 216 if (error) panic("nfs_mountroot: getattr for root"); 217 n = attr.va_mtime.ts_sec; 218 #ifdef DEBUG 219 printf("root time: 0x%x\n", n); 220 #endif 221 inittodr(n); 222 223 #ifdef notyet 224 /* Set up swap credentials. */ 225 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 226 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 227 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 228 NGROUPS) 229 proc0.p_ucred->cr_ngroups = NGROUPS; 230 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 231 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 232 #endif 233 234 /* 235 * "Mount" the swap device. 236 * 237 * On a "dataless" configuration (swap on disk) we will have: 238 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 239 */ 240 if (bdevvp(swapdev, &swapdev_vp)) 241 panic("nfs_mountroot: can't setup swap vp"); 242 if (swdevt[0].sw_dev != NODEV) 243 return (0); 244 245 /* 246 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 247 * Create a fake mount point just for the swap vnode so that the 248 * swap file can be on a different server from the rootfs. 249 */ 250 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 251 252 /* 253 * Since the swap file is not the root dir of a file system, 254 * hack it to a regular file. 255 */ 256 vp->v_type = VREG; 257 vp->v_flag = 0; 258 swdevt[0].sw_vp = vp; 259 260 /* 261 * Find out how large the swap file is. 262 */ 263 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 264 if (error) 265 panic("nfs_mountroot: getattr for swap"); 266 n = (long) (attr.va_size >> DEV_BSHIFT); 267 #ifdef DEBUG 268 printf("swap size: 0x%x (blocks)\n", n); 269 #endif 270 swdevt[0].sw_nblks = n; 271 272 return (0); 273 } 274 275 /* 276 * Internal version of mount system call for diskless setup. 277 */ 278 static struct mount * 279 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 280 struct nfs_dlmount *ndmntp; 281 char *mntname; 282 int mntflag; 283 struct vnode **vpp; 284 { 285 struct nfs_args args; 286 struct mount *mp; 287 struct mbuf *m; 288 int error; 289 290 /* Create the mount point. */ 291 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 292 M_MOUNT, M_NOWAIT); 293 if (mp == NULL) 294 panic("nfs_mountroot: malloc mount for %s", mntname); 295 bzero((char *)mp, (u_long)sizeof(struct mount)); 296 mp->mnt_op = &nfs_vfsops; 297 mp->mnt_flag = mntflag; 298 299 /* Initialize mount args. */ 300 bzero((caddr_t) &args, sizeof(args)); 301 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 302 args.addrlen = args.addr->sa_len; 303 args.sotype = SOCK_DGRAM; 304 args.fh = (nfsv2fh_t *)ndmntp->ndm_fh; 305 args.hostname = ndmntp->ndm_host; 306 args.flags = NFSMNT_RESVPORT; 307 308 #ifdef NFS_BOOT_RWSIZE 309 /* 310 * Reduce rsize,wsize for interfaces that consistently 311 * drop fragments of long UDP messages. (i.e. wd8003). 312 * You can always change these later via remount. 313 */ 314 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 315 args.wsize = NFS_BOOT_RWSIZE; 316 args.rsize = NFS_BOOT_RWSIZE; 317 #endif 318 319 /* Get mbuf for server sockaddr. */ 320 m = m_get(M_WAIT, MT_SONAME); 321 if (m == NULL) 322 panic("nfs_mountroot: mget soname for %s", mntname); 323 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 324 (m->m_len = args.addr->sa_len)); 325 326 if (error = mountnfs(&args, mp, m, mntname, args.hostname, vpp)) 327 panic("nfs_mountroot: mount %s failed: %d", mntname); 328 329 return (mp); 330 } 331 332 void 333 nfs_decode_args(nmp, argp) 334 struct nfsmount *nmp; 335 struct nfs_args *argp; 336 { 337 int s; 338 339 s = splnet(); 340 /* Update flags atomically. Don't change the lock bits. */ 341 nmp->nm_flag = 342 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 343 splx(s); 344 345 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 346 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 347 if (nmp->nm_timeo < NFS_MINTIMEO) 348 nmp->nm_timeo = NFS_MINTIMEO; 349 else if (nmp->nm_timeo > NFS_MAXTIMEO) 350 nmp->nm_timeo = NFS_MAXTIMEO; 351 } 352 353 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 354 nmp->nm_retry = argp->retrans; 355 if (nmp->nm_retry > NFS_MAXREXMIT) 356 nmp->nm_retry = NFS_MAXREXMIT; 357 } 358 359 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 360 nmp->nm_wsize = argp->wsize; 361 /* Round down to multiple of blocksize */ 362 nmp->nm_wsize &= ~0x1ff; 363 if (nmp->nm_wsize <= 0) 364 nmp->nm_wsize = 512; 365 else if (nmp->nm_wsize > NFS_MAXDATA) 366 nmp->nm_wsize = NFS_MAXDATA; 367 } 368 if (nmp->nm_wsize > MAXBSIZE) 369 nmp->nm_wsize = MAXBSIZE; 370 371 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 372 nmp->nm_rsize = argp->rsize; 373 /* Round down to multiple of blocksize */ 374 nmp->nm_rsize &= ~0x1ff; 375 if (nmp->nm_rsize <= 0) 376 nmp->nm_rsize = 512; 377 else if (nmp->nm_rsize > NFS_MAXDATA) 378 nmp->nm_rsize = NFS_MAXDATA; 379 } 380 if (nmp->nm_rsize > MAXBSIZE) 381 nmp->nm_rsize = MAXBSIZE; 382 383 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 384 argp->maxgrouplist <= NFS_MAXGRPS) 385 nmp->nm_numgrps = argp->maxgrouplist; 386 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 387 argp->readahead <= NFS_MAXRAHEAD) 388 nmp->nm_readahead = argp->readahead; 389 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 390 argp->leaseterm <= NQ_MAXLEASE) 391 nmp->nm_leaseterm = argp->leaseterm; 392 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 393 argp->deadthresh <= NQ_NEVERDEAD) 394 nmp->nm_deadthresh = argp->deadthresh; 395 } 396 397 /* 398 * VFS Operations. 399 * 400 * mount system call 401 * It seems a bit dumb to copyinstr() the host and path here and then 402 * bcopy() them in mountnfs(), but I wanted to detect errors before 403 * doing the sockargs() call because sockargs() allocates an mbuf and 404 * an error after that means that I have to release the mbuf. 405 */ 406 /* ARGSUSED */ 407 int 408 nfs_mount(mp, path, data, ndp, p) 409 struct mount *mp; 410 char *path; 411 caddr_t data; 412 struct nameidata *ndp; 413 struct proc *p; 414 { 415 int error; 416 struct nfs_args args; 417 struct mbuf *nam; 418 struct vnode *vp; 419 char pth[MNAMELEN], hst[MNAMELEN]; 420 u_int len; 421 nfsv2fh_t nfh; 422 423 if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) 424 return (error); 425 if (mp->mnt_flag & MNT_UPDATE) { 426 register struct nfsmount *nmp = VFSTONFS(mp); 427 428 if (nmp == NULL) 429 return (EIO); 430 nfs_decode_args(nmp, &args); 431 return (0); 432 } 433 if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) 434 return (error); 435 if (error = copyinstr(path, pth, MNAMELEN-1, &len)) 436 return (error); 437 bzero(&pth[len], MNAMELEN - len); 438 if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) 439 return (error); 440 bzero(&hst[len], MNAMELEN - len); 441 /* sockargs() call must be after above copyin() calls */ 442 if (error = sockargs(&nam, (caddr_t)args.addr, 443 args.addrlen, MT_SONAME)) 444 return (error); 445 args.fh = &nfh; 446 error = mountnfs(&args, mp, nam, pth, hst, &vp); 447 return (error); 448 } 449 450 /* 451 * Common code for mount and mountroot 452 */ 453 int 454 mountnfs(argp, mp, nam, pth, hst, vpp) 455 register struct nfs_args *argp; 456 register struct mount *mp; 457 struct mbuf *nam; 458 char *pth, *hst; 459 struct vnode **vpp; 460 { 461 register struct nfsmount *nmp; 462 struct nfsnode *np; 463 int error; 464 465 if (mp->mnt_flag & MNT_UPDATE) { 466 nmp = VFSTONFS(mp); 467 /* update paths, file handles, etc, here XXX */ 468 m_freem(nam); 469 return (0); 470 } else { 471 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 472 M_NFSMNT, M_WAITOK); 473 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 474 mp->mnt_data = (qaddr_t)nmp; 475 } 476 getnewfsid(mp, makefstype(MOUNT_NFS)); 477 nmp->nm_mountp = mp; 478 if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == 479 (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { 480 error = EPERM; 481 goto bad; 482 } 483 if (argp->flags & NFSMNT_NQNFS) 484 /* 485 * We have to set mnt_maxsymlink to a non-zero value so 486 * that COMPAT_43 routines will know that we are setting 487 * the d_type field in directories (and can zero it for 488 * unsuspecting binaries). 489 */ 490 mp->mnt_maxsymlinklen = 1; 491 nmp->nm_timeo = NFS_TIMEO; 492 nmp->nm_retry = NFS_RETRANS; 493 nmp->nm_wsize = NFS_WSIZE; 494 nmp->nm_rsize = NFS_RSIZE; 495 nmp->nm_numgrps = NFS_MAXGRPS; 496 nmp->nm_readahead = NFS_DEFRAHEAD; 497 nmp->nm_leaseterm = NQ_DEFLEASE; 498 nmp->nm_deadthresh = NQ_DEADTHRESH; 499 nmp->nm_tnext = (struct nfsnode *)nmp; 500 nmp->nm_tprev = (struct nfsnode *)nmp; 501 nmp->nm_inprog = NULLVP; 502 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 503 #ifdef COMPAT_09 504 mp->mnt_stat.f_type = 2; 505 #else 506 mp->mnt_stat.f_type = 0; 507 #endif 508 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 509 mp->mnt_stat.f_fstypename[MFSNAMELEN] = '\0'; 510 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 511 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 512 nmp->nm_nam = nam; 513 nfs_decode_args(nmp, argp); 514 515 /* Set up the sockets and per-host congestion */ 516 nmp->nm_sotype = argp->sotype; 517 nmp->nm_soproto = argp->proto; 518 519 /* 520 * For Connection based sockets (TCP,...) defer the connect until 521 * the first request, in case the server is not responding. 522 */ 523 if (nmp->nm_sotype == SOCK_DGRAM && 524 (error = nfs_connect(nmp, (struct nfsreq *)0))) 525 goto bad; 526 527 /* 528 * This is silly, but it has to be set so that vinifod() works. 529 * We do not want to do an nfs_statfs() here since we can get 530 * stuck on a dead server and we are holding a lock on the mount 531 * point. 532 */ 533 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 534 /* 535 * A reference count is needed on the nfsnode representing the 536 * remote root. If this object is not persistent, then backward 537 * traversals of the mount point (i.e. "..") will not work if 538 * the nfsnode gets flushed out of the cache. Ufs does not have 539 * this problem, because one can identify root inodes by their 540 * number == ROOTINO (2). 541 */ 542 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 543 goto bad; 544 *vpp = NFSTOV(np); 545 546 return (0); 547 bad: 548 nfs_disconnect(nmp); 549 free((caddr_t)nmp, M_NFSMNT); 550 m_freem(nam); 551 return (error); 552 } 553 554 /* 555 * unmount system call 556 */ 557 int 558 nfs_unmount(mp, mntflags, p) 559 struct mount *mp; 560 int mntflags; 561 struct proc *p; 562 { 563 register struct nfsmount *nmp; 564 struct nfsnode *np; 565 struct vnode *vp; 566 int error, flags = 0; 567 extern int doforce; 568 569 if (mntflags & MNT_FORCE) { 570 if (!doforce || (mp->mnt_flag & MNT_ROOTFS)) 571 return (EINVAL); 572 flags |= FORCECLOSE; 573 } 574 nmp = VFSTONFS(mp); 575 /* 576 * Goes something like this.. 577 * - Check for activity on the root vnode (other than ourselves). 578 * - Call vflush() to clear out vnodes for this file system, 579 * except for the root vnode. 580 * - Decrement reference on the vnode representing remote root. 581 * - Close the socket 582 * - Free up the data structures 583 */ 584 /* 585 * We need to decrement the ref. count on the nfsnode representing 586 * the remote root. See comment in mountnfs(). The VFS unmount() 587 * has done vput on this vnode, otherwise we would get deadlock! 588 */ 589 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 590 return(error); 591 vp = NFSTOV(np); 592 if (vp->v_usecount > 2) { 593 vput(vp); 594 return (EBUSY); 595 } 596 597 /* 598 * Must handshake with nqnfs_clientd() if it is active. 599 */ 600 nmp->nm_flag |= NFSMNT_DISMINPROG; 601 while (nmp->nm_inprog != NULLVP) 602 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 603 if (error = vflush(mp, vp, flags)) { 604 vput(vp); 605 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 606 return (error); 607 } 608 609 /* 610 * We are now committed to the unmount. 611 * For NQNFS, let the server daemon free the nfsmount structure. 612 */ 613 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 614 nmp->nm_flag |= NFSMNT_DISMNT; 615 616 /* 617 * There are two reference counts to get rid of here. 618 */ 619 vrele(vp); 620 vrele(vp); 621 vgone(vp); 622 nfs_disconnect(nmp); 623 m_freem(nmp->nm_nam); 624 625 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 626 free((caddr_t)nmp, M_NFSMNT); 627 return (0); 628 } 629 630 /* 631 * Return root of a filesystem 632 */ 633 int 634 nfs_root(mp, vpp) 635 struct mount *mp; 636 struct vnode **vpp; 637 { 638 register struct vnode *vp; 639 struct nfsmount *nmp; 640 struct nfsnode *np; 641 int error; 642 643 nmp = VFSTONFS(mp); 644 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 645 return (error); 646 vp = NFSTOV(np); 647 vp->v_type = VDIR; 648 vp->v_flag = VROOT; 649 *vpp = vp; 650 return (0); 651 } 652 653 extern int syncprt; 654 655 /* 656 * Flush out the buffer cache 657 */ 658 /* ARGSUSED */ 659 int 660 nfs_sync(mp, waitfor, cred, p) 661 struct mount *mp; 662 int waitfor; 663 struct ucred *cred; 664 struct proc *p; 665 { 666 register struct vnode *vp; 667 int error, allerror = 0; 668 669 /* 670 * Force stale buffer cache information to be flushed. 671 */ 672 loop: 673 for (vp = mp->mnt_vnodelist.lh_first; 674 vp != NULL; 675 vp = vp->v_mntvnodes.le_next) { 676 /* 677 * If the vnode that we are about to sync is no longer 678 * associated with this mount point, start over. 679 */ 680 if (vp->v_mount != mp) 681 goto loop; 682 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 683 continue; 684 if (vget(vp, 1)) 685 goto loop; 686 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 687 allerror = error; 688 vput(vp); 689 } 690 return (allerror); 691 } 692 693 /* 694 * NFS flat namespace lookup. 695 * Currently unsupported. 696 */ 697 /* ARGSUSED */ 698 int 699 nfs_vget(mp, ino, vpp) 700 struct mount *mp; 701 ino_t ino; 702 struct vnode **vpp; 703 { 704 705 return (EOPNOTSUPP); 706 } 707 708 /* 709 * At this point, this should never happen 710 */ 711 /* ARGSUSED */ 712 int 713 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 714 register struct mount *mp; 715 struct fid *fhp; 716 struct mbuf *nam; 717 struct vnode **vpp; 718 int *exflagsp; 719 struct ucred **credanonp; 720 { 721 722 return (EINVAL); 723 } 724 725 /* 726 * Vnode pointer to File handle, should never happen either 727 */ 728 /* ARGSUSED */ 729 int 730 nfs_vptofh(vp, fhp) 731 struct vnode *vp; 732 struct fid *fhp; 733 { 734 735 return (EINVAL); 736 } 737 738 /* 739 * Vfs start routine, a no-op. 740 */ 741 /* ARGSUSED */ 742 int 743 nfs_start(mp, flags, p) 744 struct mount *mp; 745 int flags; 746 struct proc *p; 747 { 748 749 return (0); 750 } 751 752 /* 753 * Do operations associated with quotas, not supported 754 */ 755 /* ARGSUSED */ 756 int 757 nfs_quotactl(mp, cmd, uid, arg, p) 758 struct mount *mp; 759 int cmd; 760 uid_t uid; 761 caddr_t arg; 762 struct proc *p; 763 { 764 765 return (EOPNOTSUPP); 766 } 767
Indexes created Thu Sep 25 16:09:42 GMT 2025