nfs_vfsops.c revision 1.42
1 /* $NetBSD: nfs_vfsops.c,v 1.42 1996/02/13 17:53:35 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/socketvar.h> 54 #include <sys/systm.h> 55 56 #include <net/if.h> 57 #include <net/route.h> 58 #include <netinet/in.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/nfsv2.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfsmount.h> 64 #include <nfs/nfs.h> 65 #include <nfs/xdr_subs.h> 66 #include <nfs/nfsm_subs.h> 67 #include <nfs/nfsdiskless.h> 68 #include <nfs/nqnfs.h> 69 #include <nfs/nfs_var.h> 70 71 /* 72 * nfs vfs operations. 73 */ 74 struct vfsops nfs_vfsops = { 75 MOUNT_NFS, 76 nfs_mount, 77 nfs_start, 78 nfs_unmount, 79 nfs_root, 80 nfs_quotactl, 81 nfs_statfs, 82 nfs_sync, 83 nfs_vget, 84 nfs_fhtovp, 85 nfs_vptofh, 86 nfs_init, 87 }; 88 89 extern u_long nfs_procids[NFS_NPROCS]; 90 extern u_long nfs_prog, nfs_vers; 91 void nfs_disconnect __P((struct nfsmount *)); 92 93 static struct mount * 94 nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); 95 96 #define TRUE 1 97 #define FALSE 0 98 99 /* 100 * nfs statfs call 101 */ 102 int 103 nfs_statfs(mp, sbp, p) 104 struct mount *mp; 105 register struct statfs *sbp; 106 struct proc *p; 107 { 108 register struct vnode *vp; 109 register struct nfsv2_statfs *sfp; 110 register caddr_t cp; 111 register int32_t t1; 112 caddr_t bpos, dpos, cp2; 113 int error = 0, isnq; 114 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 115 struct nfsmount *nmp; 116 struct ucred *cred; 117 struct nfsnode *np; 118 119 nmp = VFSTONFS(mp); 120 isnq = (nmp->nm_flag & NFSMNT_NQNFS); 121 if ((error = nfs_nget(mp, &nmp->nm_fh, &np)) != 0) 122 return (error); 123 vp = NFSTOV(np); 124 nfsstats.rpccnt[NFSPROC_STATFS]++; 125 cred = crget(); 126 cred->cr_ngroups = 0; 127 nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH); 128 nfsm_fhtom(vp); 129 nfsm_request(vp, NFSPROC_STATFS, p, cred); 130 nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq)); 131 #ifdef COMPAT_09 132 sbp->f_type = 2; 133 #else 134 sbp->f_type = 0; 135 #endif 136 sbp->f_flags = nmp->nm_flag; 137 sbp->f_iosize = NFS_MAXDGRAMDATA; 138 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 139 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 140 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 141 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 142 if (isnq) { 143 sbp->f_files = fxdr_unsigned(int32_t, sfp->sf_files); 144 sbp->f_ffree = fxdr_unsigned(int32_t, sfp->sf_ffree); 145 } else { 146 sbp->f_files = 0; 147 sbp->f_ffree = 0; 148 } 149 if (sbp != &mp->mnt_stat) { 150 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 151 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 152 } 153 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 154 nfsm_reqdone; 155 vrele(vp); 156 crfree(cred); 157 return (error); 158 } 159 160 /* 161 * Mount a remote root fs via. NFS. It goes like this: 162 * - Call nfs_boot_init() to fill in the nfs_diskless struct 163 * (using RARP, bootparam RPC, mountd RPC) 164 * - hand craft the swap nfs vnode hanging off a fake mount point 165 * if swdevt[0].sw_dev == NODEV 166 * - build the rootfs mount point and call mountnfs() to do the rest. 167 */ 168 int 169 nfs_mountroot() 170 { 171 struct nfs_diskless nd; 172 struct vattr attr; 173 struct mount *mp; 174 struct vnode *vp; 175 struct proc *procp; 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 nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root); 201 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 202 printf("root on %s\n", nd.nd_root.ndm_host); 203 204 /* 205 * Link it into the mount list. 206 */ 207 if (vfs_lock(mp)) 208 panic("nfs_mountroot: vfs_lock"); 209 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 210 mp->mnt_vnodecovered = NULLVP; 211 vfs_unlock(mp); 212 rootvp = vp; 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.tv_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 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 244 return (0); 245 } 246 247 /* 248 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 249 * Create a fake mount point just for the swap vnode so that the 250 * swap file can be on a different server from the rootfs. 251 */ 252 nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap); 253 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 254 printf("swap on %s\n", nd.nd_swap.ndm_host); 255 256 /* 257 * Since the swap file is not the root dir of a file system, 258 * hack it to a regular file. 259 */ 260 vp->v_type = VREG; 261 vp->v_flag = 0; 262 swdevt[0].sw_vp = vp; 263 264 /* 265 * Find out how large the swap file is. 266 */ 267 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 268 if (error) 269 panic("nfs_mountroot: getattr for swap"); 270 n = (long) (attr.va_size >> DEV_BSHIFT); 271 #ifdef DEBUG 272 printf("swap size: 0x%x (blocks)\n", n); 273 #endif 274 swdevt[0].sw_nblks = n; 275 276 return (0); 277 } 278 279 /* 280 * Internal version of mount system call for diskless setup. 281 */ 282 static struct mount * 283 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 284 struct nfs_dlmount *ndmntp; 285 char *mntname; 286 int mntflag; 287 struct vnode **vpp; 288 { 289 struct nfs_args args; 290 struct mount *mp; 291 struct mbuf *m; 292 int error; 293 294 /* Create the mount point. */ 295 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 296 M_MOUNT, M_WAITOK); 297 if (mp == NULL) 298 panic("nfs_mountroot: malloc mount for %s", mntname); 299 bzero((char *)mp, (u_long)sizeof(struct mount)); 300 mp->mnt_op = &nfs_vfsops; 301 mp->mnt_flag = mntflag; 302 303 /* Initialize mount args. */ 304 bzero((caddr_t) &args, sizeof(args)); 305 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 306 args.addrlen = args.addr->sa_len; 307 args.sotype = SOCK_DGRAM; 308 args.fh = (nfsv2fh_t *)ndmntp->ndm_fh; 309 args.hostname = ndmntp->ndm_host; 310 args.flags = NFSMNT_RESVPORT; 311 312 #ifdef NFS_BOOT_OPTIONS 313 args.flags |= NFS_BOOT_OPTIONS; 314 #endif 315 #ifdef NFS_BOOT_RWSIZE 316 /* 317 * Reduce rsize,wsize for interfaces that consistently 318 * drop fragments of long UDP messages. (i.e. wd8003). 319 * You can always change these later via remount. 320 */ 321 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 322 args.wsize = NFS_BOOT_RWSIZE; 323 args.rsize = NFS_BOOT_RWSIZE; 324 #endif 325 326 /* Get mbuf for server sockaddr. */ 327 m = m_get(M_WAIT, MT_SONAME); 328 if (m == NULL) 329 panic("nfs_mountroot: mget soname for %s", mntname); 330 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 331 (m->m_len = args.addr->sa_len)); 332 333 error = mountnfs(&args, mp, m, mntname, args.hostname, vpp); 334 if (error) 335 panic("nfs_mountroot: mount %s failed: %d", mntname); 336 337 return (mp); 338 } 339 340 void 341 nfs_decode_args(nmp, argp) 342 struct nfsmount *nmp; 343 struct nfs_args *argp; 344 { 345 int s; 346 int adjsock; 347 348 s = splsoftnet(); 349 350 /* Re-bind if rsrvd port requested and wasn't on one */ 351 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 352 && (argp->flags & NFSMNT_RESVPORT); 353 354 /* Update flags atomically. Don't change the lock bits. */ 355 nmp->nm_flag = 356 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 357 splx(s); 358 359 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 360 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 361 if (nmp->nm_timeo < NFS_MINTIMEO) 362 nmp->nm_timeo = NFS_MINTIMEO; 363 else if (nmp->nm_timeo > NFS_MAXTIMEO) 364 nmp->nm_timeo = NFS_MAXTIMEO; 365 } 366 367 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 368 nmp->nm_retry = argp->retrans; 369 if (nmp->nm_retry > NFS_MAXREXMIT) 370 nmp->nm_retry = NFS_MAXREXMIT; 371 } 372 373 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 374 int osize = nmp->nm_wsize; 375 nmp->nm_wsize = argp->wsize; 376 /* Round down to multiple of blocksize */ 377 nmp->nm_wsize &= ~0x1ff; 378 if (nmp->nm_wsize <= 0) 379 nmp->nm_wsize = 512; 380 else if (nmp->nm_wsize > NFS_MAXDATA) 381 nmp->nm_wsize = NFS_MAXDATA; 382 adjsock |= (nmp->nm_wsize != osize); 383 } 384 if (nmp->nm_wsize > MAXBSIZE) 385 nmp->nm_wsize = MAXBSIZE; 386 387 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 388 int osize = nmp->nm_rsize; 389 nmp->nm_rsize = argp->rsize; 390 /* Round down to multiple of blocksize */ 391 nmp->nm_rsize &= ~0x1ff; 392 if (nmp->nm_rsize <= 0) 393 nmp->nm_rsize = 512; 394 else if (nmp->nm_rsize > NFS_MAXDATA) 395 nmp->nm_rsize = NFS_MAXDATA; 396 adjsock |= (nmp->nm_rsize != osize); 397 } 398 if (nmp->nm_rsize > MAXBSIZE) 399 nmp->nm_rsize = MAXBSIZE; 400 401 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 402 argp->maxgrouplist <= NFS_MAXGRPS) 403 nmp->nm_numgrps = argp->maxgrouplist; 404 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 405 argp->readahead <= NFS_MAXRAHEAD) 406 nmp->nm_readahead = argp->readahead; 407 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 408 argp->leaseterm <= NQ_MAXLEASE) 409 nmp->nm_leaseterm = argp->leaseterm; 410 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 411 argp->deadthresh <= NQ_NEVERDEAD) 412 nmp->nm_deadthresh = argp->deadthresh; 413 414 if (nmp->nm_so && adjsock) { 415 nfs_disconnect(nmp); 416 if (nmp->nm_sotype == SOCK_DGRAM) 417 while (nfs_connect(nmp, (struct nfsreq *)0)) { 418 printf("nfs_args: retrying connect\n"); 419 (void) tsleep((caddr_t)&lbolt, 420 PSOCK, "nfscon", 0); 421 } 422 } 423 } 424 425 /* 426 * VFS Operations. 427 * 428 * mount system call 429 * It seems a bit dumb to copyinstr() the host and path here and then 430 * bcopy() them in mountnfs(), but I wanted to detect errors before 431 * doing the sockargs() call because sockargs() allocates an mbuf and 432 * an error after that means that I have to release the mbuf. 433 */ 434 /* ARGSUSED */ 435 int 436 nfs_mount(mp, path, data, ndp, p) 437 struct mount *mp; 438 char *path; 439 caddr_t data; 440 struct nameidata *ndp; 441 struct proc *p; 442 { 443 int error; 444 struct nfs_args args; 445 struct mbuf *nam; 446 struct vnode *vp; 447 char pth[MNAMELEN], hst[MNAMELEN]; 448 size_t len; 449 nfsv2fh_t nfh; 450 451 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 452 if (error) 453 return (error); 454 if (mp->mnt_flag & MNT_UPDATE) { 455 register struct nfsmount *nmp = VFSTONFS(mp); 456 457 if (nmp == NULL) 458 return (EIO); 459 nfs_decode_args(nmp, &args); 460 return (0); 461 } 462 error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t)); 463 if (error) 464 return (error); 465 if ((error = copyinstr(path, pth, MNAMELEN-1, &len)) != 0) 466 return (error); 467 bzero(&pth[len], MNAMELEN - len); 468 if ((error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) != 0) 469 return (error); 470 bzero(&hst[len], MNAMELEN - len); 471 /* sockargs() call must be after above copyin() calls */ 472 error = sockargs(&nam, (caddr_t)args.addr, 473 args.addrlen, MT_SONAME); 474 if (error) 475 return (error); 476 args.fh = &nfh; 477 error = mountnfs(&args, mp, nam, pth, hst, &vp); 478 return (error); 479 } 480 481 /* 482 * Common code for mount and mountroot 483 */ 484 int 485 mountnfs(argp, mp, nam, pth, hst, vpp) 486 register struct nfs_args *argp; 487 register struct mount *mp; 488 struct mbuf *nam; 489 char *pth, *hst; 490 struct vnode **vpp; 491 { 492 register struct nfsmount *nmp; 493 struct nfsnode *np; 494 int error; 495 496 if (mp->mnt_flag & MNT_UPDATE) { 497 nmp = VFSTONFS(mp); 498 /* update paths, file handles, etc, here XXX */ 499 m_freem(nam); 500 return (0); 501 } else { 502 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 503 M_NFSMNT, M_WAITOK); 504 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 505 mp->mnt_data = (qaddr_t)nmp; 506 } 507 getnewfsid(mp, makefstype(MOUNT_NFS)); 508 nmp->nm_mountp = mp; 509 if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == 510 (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { 511 error = EPERM; 512 goto bad; 513 } 514 if (argp->flags & NFSMNT_NQNFS) 515 /* 516 * We have to set mnt_maxsymlink to a non-zero value so 517 * that COMPAT_43 routines will know that we are setting 518 * the d_type field in directories (and can zero it for 519 * unsuspecting binaries). 520 */ 521 mp->mnt_maxsymlinklen = 1; 522 nmp->nm_timeo = NFS_TIMEO; 523 nmp->nm_retry = NFS_RETRANS; 524 nmp->nm_wsize = NFS_WSIZE; 525 nmp->nm_rsize = NFS_RSIZE; 526 nmp->nm_numgrps = NFS_MAXGRPS; 527 nmp->nm_readahead = NFS_DEFRAHEAD; 528 nmp->nm_leaseterm = NQ_DEFLEASE; 529 nmp->nm_deadthresh = NQ_DEADTHRESH; 530 CIRCLEQ_INIT(&nmp->nm_timerhead); 531 nmp->nm_inprog = NULLVP; 532 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 533 #ifdef COMPAT_09 534 mp->mnt_stat.f_type = 2; 535 #else 536 mp->mnt_stat.f_type = 0; 537 #endif 538 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 539 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 540 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 541 nmp->nm_nam = nam; 542 nfs_decode_args(nmp, argp); 543 544 /* Set up the sockets and per-host congestion */ 545 nmp->nm_sotype = argp->sotype; 546 nmp->nm_soproto = argp->proto; 547 548 /* 549 * For Connection based sockets (TCP,...) defer the connect until 550 * the first request, in case the server is not responding. 551 */ 552 if (nmp->nm_sotype == SOCK_DGRAM && 553 (error = nfs_connect(nmp, (struct nfsreq *)0))) 554 goto bad; 555 556 /* 557 * This is silly, but it has to be set so that vinifod() works. 558 * We do not want to do an nfs_statfs() here since we can get 559 * stuck on a dead server and we are holding a lock on the mount 560 * point. 561 */ 562 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 563 /* 564 * A reference count is needed on the nfsnode representing the 565 * remote root. If this object is not persistent, then backward 566 * traversals of the mount point (i.e. "..") will not work if 567 * the nfsnode gets flushed out of the cache. Ufs does not have 568 * this problem, because one can identify root inodes by their 569 * number == ROOTINO (2). 570 */ 571 if ((error = nfs_nget(mp, &nmp->nm_fh, &np)) != 0) 572 goto bad; 573 *vpp = NFSTOV(np); 574 575 return (0); 576 bad: 577 nfs_disconnect(nmp); 578 free((caddr_t)nmp, M_NFSMNT); 579 m_freem(nam); 580 return (error); 581 } 582 583 /* 584 * unmount system call 585 */ 586 int 587 nfs_unmount(mp, mntflags, p) 588 struct mount *mp; 589 int mntflags; 590 struct proc *p; 591 { 592 register struct nfsmount *nmp; 593 struct nfsnode *np; 594 struct vnode *vp; 595 int error, flags = 0; 596 597 if (mntflags & MNT_FORCE) 598 flags |= FORCECLOSE; 599 nmp = VFSTONFS(mp); 600 /* 601 * Goes something like this.. 602 * - Check for activity on the root vnode (other than ourselves). 603 * - Call vflush() to clear out vnodes for this file system, 604 * except for the root vnode. 605 * - Decrement reference on the vnode representing remote root. 606 * - Close the socket 607 * - Free up the data structures 608 */ 609 /* 610 * We need to decrement the ref. count on the nfsnode representing 611 * the remote root. See comment in mountnfs(). The VFS unmount() 612 * has done vput on this vnode, otherwise we would get deadlock! 613 */ 614 if ((error = nfs_nget(mp, &nmp->nm_fh, &np)) != 0) 615 return(error); 616 vp = NFSTOV(np); 617 if (vp->v_usecount > 2) { 618 vput(vp); 619 return (EBUSY); 620 } 621 622 /* 623 * Must handshake with nqnfs_clientd() if it is active. 624 */ 625 nmp->nm_flag |= NFSMNT_DISMINPROG; 626 while (nmp->nm_inprog != NULLVP) 627 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 628 if ((error = vflush(mp, vp, flags)) != 0) { 629 vput(vp); 630 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 631 return (error); 632 } 633 634 /* 635 * We are now committed to the unmount. 636 * For NQNFS, let the server daemon free the nfsmount structure. 637 */ 638 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 639 nmp->nm_flag |= NFSMNT_DISMNT; 640 641 /* 642 * There are two reference counts to get rid of here. 643 */ 644 vrele(vp); 645 vrele(vp); 646 vgone(vp); 647 nfs_disconnect(nmp); 648 m_freem(nmp->nm_nam); 649 650 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 651 free((caddr_t)nmp, M_NFSMNT); 652 return (0); 653 } 654 655 /* 656 * Return root of a filesystem 657 */ 658 int 659 nfs_root(mp, vpp) 660 struct mount *mp; 661 struct vnode **vpp; 662 { 663 register struct vnode *vp; 664 struct nfsmount *nmp; 665 struct nfsnode *np; 666 int error; 667 668 nmp = VFSTONFS(mp); 669 if ((error = nfs_nget(mp, &nmp->nm_fh, &np)) != 0) 670 return (error); 671 vp = NFSTOV(np); 672 vp->v_type = VDIR; 673 vp->v_flag = VROOT; 674 *vpp = vp; 675 return (0); 676 } 677 678 extern int syncprt; 679 680 /* 681 * Flush out the buffer cache 682 */ 683 /* ARGSUSED */ 684 int 685 nfs_sync(mp, waitfor, cred, p) 686 struct mount *mp; 687 int waitfor; 688 struct ucred *cred; 689 struct proc *p; 690 { 691 register struct vnode *vp; 692 int error, allerror = 0; 693 694 /* 695 * Force stale buffer cache information to be flushed. 696 */ 697 loop: 698 for (vp = mp->mnt_vnodelist.lh_first; 699 vp != NULL; 700 vp = vp->v_mntvnodes.le_next) { 701 /* 702 * If the vnode that we are about to sync is no longer 703 * associated with this mount point, start over. 704 */ 705 if (vp->v_mount != mp) 706 goto loop; 707 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 708 continue; 709 if (vget(vp, 1)) 710 goto loop; 711 if ((error = VOP_FSYNC(vp, cred, waitfor, p)) != 0) 712 allerror = error; 713 vput(vp); 714 } 715 return (allerror); 716 } 717 718 /* 719 * NFS flat namespace lookup. 720 * Currently unsupported. 721 */ 722 /* ARGSUSED */ 723 int 724 nfs_vget(mp, ino, vpp) 725 struct mount *mp; 726 ino_t ino; 727 struct vnode **vpp; 728 { 729 730 return (EOPNOTSUPP); 731 } 732 733 /* 734 * At this point, this should never happen 735 */ 736 /* ARGSUSED */ 737 int 738 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 739 register struct mount *mp; 740 struct fid *fhp; 741 struct mbuf *nam; 742 struct vnode **vpp; 743 int *exflagsp; 744 struct ucred **credanonp; 745 { 746 747 return (EINVAL); 748 } 749 750 /* 751 * Vnode pointer to File handle, should never happen either 752 */ 753 /* ARGSUSED */ 754 int 755 nfs_vptofh(vp, fhp) 756 struct vnode *vp; 757 struct fid *fhp; 758 { 759 760 return (EINVAL); 761 } 762 763 /* 764 * Vfs start routine, a no-op. 765 */ 766 /* ARGSUSED */ 767 int 768 nfs_start(mp, flags, p) 769 struct mount *mp; 770 int flags; 771 struct proc *p; 772 { 773 774 return (0); 775 } 776 777 /* 778 * Do operations associated with quotas, not supported 779 */ 780 /* ARGSUSED */ 781 int 782 nfs_quotactl(mp, cmd, uid, arg, p) 783 struct mount *mp; 784 int cmd; 785 uid_t uid; 786 caddr_t arg; 787 struct proc *p; 788 { 789 790 return (EOPNOTSUPP); 791 } 792
Indexes created Fri Sep 26 08:10:20 GMT 2025