nfs_vfsops.c revision 1.38
1 /* $NetBSD: nfs_vfsops.c,v 1.38 1995/08/13 00:00:08 mycroft 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 = 0; 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 nfsm_reqdone; 153 vrele(vp); 154 crfree(cred); 155 return (error); 156 } 157 158 /* 159 * Mount a remote root fs via. NFS. It goes like this: 160 * - Call nfs_boot_init() to fill in the nfs_diskless struct 161 * (using RARP, bootparam RPC, mountd RPC) 162 * - hand craft the swap nfs vnode hanging off a fake mount point 163 * if swdevt[0].sw_dev == NODEV 164 * - build the rootfs mount point and call mountnfs() to do the rest. 165 */ 166 int 167 nfs_mountroot() 168 { 169 struct nfs_diskless nd; 170 struct vattr attr; 171 struct mount *mp; 172 struct vnode *vp; 173 struct proc *procp; 174 struct ucred *cred; 175 long n; 176 int error; 177 178 procp = curproc; /* XXX */ 179 180 /* 181 * XXX time must be non-zero when we init the interface or else 182 * the arp code will wedge. [Fixed now in if_ether.c] 183 * However, the NFS attribute cache gives false "hits" when 184 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 185 */ 186 if (time.tv_sec < NFS_MAXATTRTIMO) 187 time.tv_sec = NFS_MAXATTRTIMO; 188 189 /* 190 * Call nfs_boot_init() to fill in the nfs_diskless struct. 191 * Side effect: Finds and configures a network interface. 192 */ 193 bzero((caddr_t) &nd, sizeof(nd)); 194 nfs_boot_init(&nd, procp); 195 196 /* 197 * Create the root mount point. 198 */ 199 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 200 printf("root on %s\n", &nd.nd_root.ndm_host); 201 202 /* 203 * Link it into the mount list. 204 */ 205 if (vfs_lock(mp)) 206 panic("nfs_mountroot: vfs_lock"); 207 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 208 mp->mnt_vnodecovered = NULLVP; 209 vfs_unlock(mp); 210 rootvp = vp; 211 212 /* Get root attributes (for the time). */ 213 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 214 if (error) panic("nfs_mountroot: getattr for root"); 215 n = attr.va_mtime.ts_sec; 216 #ifdef DEBUG 217 printf("root time: 0x%x\n", n); 218 #endif 219 inittodr(n); 220 221 #ifdef notyet 222 /* Set up swap credentials. */ 223 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 224 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 225 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 226 NGROUPS) 227 proc0.p_ucred->cr_ngroups = NGROUPS; 228 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 229 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 230 #endif 231 232 /* 233 * "Mount" the swap device. 234 * 235 * On a "dataless" configuration (swap on disk) we will have: 236 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 237 */ 238 if (bdevvp(swapdev, &swapdev_vp)) 239 panic("nfs_mountroot: can't setup swap vp"); 240 if (swdevt[0].sw_dev != NODEV) { 241 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 242 return (0); 243 } 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 printf("swap on %s\n", &nd.nd_swap.ndm_host); 252 253 /* 254 * Since the swap file is not the root dir of a file system, 255 * hack it to a regular file. 256 */ 257 vp->v_type = VREG; 258 vp->v_flag = 0; 259 swdevt[0].sw_vp = vp; 260 261 /* 262 * Find out how large the swap file is. 263 */ 264 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 265 if (error) 266 panic("nfs_mountroot: getattr for swap"); 267 n = (long) (attr.va_size >> DEV_BSHIFT); 268 #ifdef DEBUG 269 printf("swap size: 0x%x (blocks)\n", n); 270 #endif 271 swdevt[0].sw_nblks = n; 272 273 return (0); 274 } 275 276 /* 277 * Internal version of mount system call for diskless setup. 278 */ 279 static struct mount * 280 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 281 struct nfs_dlmount *ndmntp; 282 char *mntname; 283 int mntflag; 284 struct vnode **vpp; 285 { 286 struct nfs_args args; 287 struct mount *mp; 288 struct mbuf *m; 289 int error; 290 291 /* Create the mount point. */ 292 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 293 M_MOUNT, M_NOWAIT); 294 if (mp == NULL) 295 panic("nfs_mountroot: malloc mount for %s", mntname); 296 bzero((char *)mp, (u_long)sizeof(struct mount)); 297 mp->mnt_op = &nfs_vfsops; 298 mp->mnt_flag = mntflag; 299 300 /* Initialize mount args. */ 301 bzero((caddr_t) &args, sizeof(args)); 302 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 303 args.addrlen = args.addr->sa_len; 304 args.sotype = SOCK_DGRAM; 305 args.fh = (nfsv2fh_t *)ndmntp->ndm_fh; 306 args.hostname = ndmntp->ndm_host; 307 args.flags = NFSMNT_RESVPORT; 308 309 #ifdef NFS_BOOT_OPTIONS 310 args.flags |= NFS_BOOT_OPTIONS; 311 #endif 312 #ifdef NFS_BOOT_RWSIZE 313 /* 314 * Reduce rsize,wsize for interfaces that consistently 315 * drop fragments of long UDP messages. (i.e. wd8003). 316 * You can always change these later via remount. 317 */ 318 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 319 args.wsize = NFS_BOOT_RWSIZE; 320 args.rsize = NFS_BOOT_RWSIZE; 321 #endif 322 323 /* Get mbuf for server sockaddr. */ 324 m = m_get(M_WAIT, MT_SONAME); 325 if (m == NULL) 326 panic("nfs_mountroot: mget soname for %s", mntname); 327 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 328 (m->m_len = args.addr->sa_len)); 329 330 if (error = mountnfs(&args, mp, m, mntname, args.hostname, vpp)) 331 panic("nfs_mountroot: mount %s failed: %d", mntname); 332 333 return (mp); 334 } 335 336 void 337 nfs_decode_args(nmp, argp) 338 struct nfsmount *nmp; 339 struct nfs_args *argp; 340 { 341 int s; 342 int adjsock; 343 344 s = splsoftnet(); 345 346 /* Re-bind if rsrvd port requested and wasn't on one */ 347 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 348 && (argp->flags & NFSMNT_RESVPORT); 349 350 /* Update flags atomically. Don't change the lock bits. */ 351 nmp->nm_flag = 352 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 353 splx(s); 354 355 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 356 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 357 if (nmp->nm_timeo < NFS_MINTIMEO) 358 nmp->nm_timeo = NFS_MINTIMEO; 359 else if (nmp->nm_timeo > NFS_MAXTIMEO) 360 nmp->nm_timeo = NFS_MAXTIMEO; 361 } 362 363 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 364 nmp->nm_retry = argp->retrans; 365 if (nmp->nm_retry > NFS_MAXREXMIT) 366 nmp->nm_retry = NFS_MAXREXMIT; 367 } 368 369 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 370 int osize = nmp->nm_wsize; 371 nmp->nm_wsize = argp->wsize; 372 /* Round down to multiple of blocksize */ 373 nmp->nm_wsize &= ~0x1ff; 374 if (nmp->nm_wsize <= 0) 375 nmp->nm_wsize = 512; 376 else if (nmp->nm_wsize > NFS_MAXDATA) 377 nmp->nm_wsize = NFS_MAXDATA; 378 adjsock |= (nmp->nm_wsize != osize); 379 } 380 if (nmp->nm_wsize > MAXBSIZE) 381 nmp->nm_wsize = MAXBSIZE; 382 383 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 384 int osize = nmp->nm_rsize; 385 nmp->nm_rsize = argp->rsize; 386 /* Round down to multiple of blocksize */ 387 nmp->nm_rsize &= ~0x1ff; 388 if (nmp->nm_rsize <= 0) 389 nmp->nm_rsize = 512; 390 else if (nmp->nm_rsize > NFS_MAXDATA) 391 nmp->nm_rsize = NFS_MAXDATA; 392 adjsock |= (nmp->nm_rsize != osize); 393 } 394 if (nmp->nm_rsize > MAXBSIZE) 395 nmp->nm_rsize = MAXBSIZE; 396 397 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 398 argp->maxgrouplist <= NFS_MAXGRPS) 399 nmp->nm_numgrps = argp->maxgrouplist; 400 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 401 argp->readahead <= NFS_MAXRAHEAD) 402 nmp->nm_readahead = argp->readahead; 403 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 404 argp->leaseterm <= NQ_MAXLEASE) 405 nmp->nm_leaseterm = argp->leaseterm; 406 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 407 argp->deadthresh <= NQ_NEVERDEAD) 408 nmp->nm_deadthresh = argp->deadthresh; 409 410 if (nmp->nm_so && adjsock) { 411 nfs_disconnect(nmp); 412 if (nmp->nm_sotype == SOCK_DGRAM) 413 while (nfs_connect(nmp, (struct nfsreq *)0)) { 414 printf("nfs_args: retrying connect\n"); 415 (void) tsleep((caddr_t)&lbolt, 416 PSOCK, "nfscon", 0); 417 } 418 } 419 } 420 421 /* 422 * VFS Operations. 423 * 424 * mount system call 425 * It seems a bit dumb to copyinstr() the host and path here and then 426 * bcopy() them in mountnfs(), but I wanted to detect errors before 427 * doing the sockargs() call because sockargs() allocates an mbuf and 428 * an error after that means that I have to release the mbuf. 429 */ 430 /* ARGSUSED */ 431 int 432 nfs_mount(mp, path, data, ndp, p) 433 struct mount *mp; 434 char *path; 435 caddr_t data; 436 struct nameidata *ndp; 437 struct proc *p; 438 { 439 int error; 440 struct nfs_args args; 441 struct mbuf *nam; 442 struct vnode *vp; 443 char pth[MNAMELEN], hst[MNAMELEN]; 444 size_t len; 445 nfsv2fh_t nfh; 446 447 if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) 448 return (error); 449 if (mp->mnt_flag & MNT_UPDATE) { 450 register struct nfsmount *nmp = VFSTONFS(mp); 451 452 if (nmp == NULL) 453 return (EIO); 454 nfs_decode_args(nmp, &args); 455 return (0); 456 } 457 if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) 458 return (error); 459 if (error = copyinstr(path, pth, MNAMELEN-1, &len)) 460 return (error); 461 bzero(&pth[len], MNAMELEN - len); 462 if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) 463 return (error); 464 bzero(&hst[len], MNAMELEN - len); 465 /* sockargs() call must be after above copyin() calls */ 466 if (error = sockargs(&nam, (caddr_t)args.addr, 467 args.addrlen, MT_SONAME)) 468 return (error); 469 args.fh = &nfh; 470 error = mountnfs(&args, mp, nam, pth, hst, &vp); 471 return (error); 472 } 473 474 /* 475 * Common code for mount and mountroot 476 */ 477 int 478 mountnfs(argp, mp, nam, pth, hst, vpp) 479 register struct nfs_args *argp; 480 register struct mount *mp; 481 struct mbuf *nam; 482 char *pth, *hst; 483 struct vnode **vpp; 484 { 485 register struct nfsmount *nmp; 486 struct nfsnode *np; 487 int error; 488 489 if (mp->mnt_flag & MNT_UPDATE) { 490 nmp = VFSTONFS(mp); 491 /* update paths, file handles, etc, here XXX */ 492 m_freem(nam); 493 return (0); 494 } else { 495 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 496 M_NFSMNT, M_WAITOK); 497 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 498 mp->mnt_data = (qaddr_t)nmp; 499 } 500 getnewfsid(mp, makefstype(MOUNT_NFS)); 501 nmp->nm_mountp = mp; 502 if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == 503 (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { 504 error = EPERM; 505 goto bad; 506 } 507 if (argp->flags & NFSMNT_NQNFS) 508 /* 509 * We have to set mnt_maxsymlink to a non-zero value so 510 * that COMPAT_43 routines will know that we are setting 511 * the d_type field in directories (and can zero it for 512 * unsuspecting binaries). 513 */ 514 mp->mnt_maxsymlinklen = 1; 515 nmp->nm_timeo = NFS_TIMEO; 516 nmp->nm_retry = NFS_RETRANS; 517 nmp->nm_wsize = NFS_WSIZE; 518 nmp->nm_rsize = NFS_RSIZE; 519 nmp->nm_numgrps = NFS_MAXGRPS; 520 nmp->nm_readahead = NFS_DEFRAHEAD; 521 nmp->nm_leaseterm = NQ_DEFLEASE; 522 nmp->nm_deadthresh = NQ_DEADTHRESH; 523 CIRCLEQ_INIT(&nmp->nm_timerhead); 524 nmp->nm_inprog = NULLVP; 525 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 526 #ifdef COMPAT_09 527 mp->mnt_stat.f_type = 2; 528 #else 529 mp->mnt_stat.f_type = 0; 530 #endif 531 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 532 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 533 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 534 nmp->nm_nam = nam; 535 nfs_decode_args(nmp, argp); 536 537 /* Set up the sockets and per-host congestion */ 538 nmp->nm_sotype = argp->sotype; 539 nmp->nm_soproto = argp->proto; 540 541 /* 542 * For Connection based sockets (TCP,...) defer the connect until 543 * the first request, in case the server is not responding. 544 */ 545 if (nmp->nm_sotype == SOCK_DGRAM && 546 (error = nfs_connect(nmp, (struct nfsreq *)0))) 547 goto bad; 548 549 /* 550 * This is silly, but it has to be set so that vinifod() works. 551 * We do not want to do an nfs_statfs() here since we can get 552 * stuck on a dead server and we are holding a lock on the mount 553 * point. 554 */ 555 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 556 /* 557 * A reference count is needed on the nfsnode representing the 558 * remote root. If this object is not persistent, then backward 559 * traversals of the mount point (i.e. "..") will not work if 560 * the nfsnode gets flushed out of the cache. Ufs does not have 561 * this problem, because one can identify root inodes by their 562 * number == ROOTINO (2). 563 */ 564 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 565 goto bad; 566 *vpp = NFSTOV(np); 567 568 return (0); 569 bad: 570 nfs_disconnect(nmp); 571 free((caddr_t)nmp, M_NFSMNT); 572 m_freem(nam); 573 return (error); 574 } 575 576 /* 577 * unmount system call 578 */ 579 int 580 nfs_unmount(mp, mntflags, p) 581 struct mount *mp; 582 int mntflags; 583 struct proc *p; 584 { 585 register struct nfsmount *nmp; 586 struct nfsnode *np; 587 struct vnode *vp; 588 int error, flags = 0; 589 extern int doforce; 590 591 if (mntflags & MNT_FORCE) 592 flags |= FORCECLOSE; 593 nmp = VFSTONFS(mp); 594 /* 595 * Goes something like this.. 596 * - Check for activity on the root vnode (other than ourselves). 597 * - Call vflush() to clear out vnodes for this file system, 598 * except for the root vnode. 599 * - Decrement reference on the vnode representing remote root. 600 * - Close the socket 601 * - Free up the data structures 602 */ 603 /* 604 * We need to decrement the ref. count on the nfsnode representing 605 * the remote root. See comment in mountnfs(). The VFS unmount() 606 * has done vput on this vnode, otherwise we would get deadlock! 607 */ 608 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 609 return(error); 610 vp = NFSTOV(np); 611 if (vp->v_usecount > 2) { 612 vput(vp); 613 return (EBUSY); 614 } 615 616 /* 617 * Must handshake with nqnfs_clientd() if it is active. 618 */ 619 nmp->nm_flag |= NFSMNT_DISMINPROG; 620 while (nmp->nm_inprog != NULLVP) 621 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 622 if (error = vflush(mp, vp, flags)) { 623 vput(vp); 624 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 625 return (error); 626 } 627 628 /* 629 * We are now committed to the unmount. 630 * For NQNFS, let the server daemon free the nfsmount structure. 631 */ 632 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 633 nmp->nm_flag |= NFSMNT_DISMNT; 634 635 /* 636 * There are two reference counts to get rid of here. 637 */ 638 vrele(vp); 639 vrele(vp); 640 vgone(vp); 641 nfs_disconnect(nmp); 642 m_freem(nmp->nm_nam); 643 644 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 645 free((caddr_t)nmp, M_NFSMNT); 646 return (0); 647 } 648 649 /* 650 * Return root of a filesystem 651 */ 652 int 653 nfs_root(mp, vpp) 654 struct mount *mp; 655 struct vnode **vpp; 656 { 657 register struct vnode *vp; 658 struct nfsmount *nmp; 659 struct nfsnode *np; 660 int error; 661 662 nmp = VFSTONFS(mp); 663 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 664 return (error); 665 vp = NFSTOV(np); 666 vp->v_type = VDIR; 667 vp->v_flag = VROOT; 668 *vpp = vp; 669 return (0); 670 } 671 672 extern int syncprt; 673 674 /* 675 * Flush out the buffer cache 676 */ 677 /* ARGSUSED */ 678 int 679 nfs_sync(mp, waitfor, cred, p) 680 struct mount *mp; 681 int waitfor; 682 struct ucred *cred; 683 struct proc *p; 684 { 685 register struct vnode *vp; 686 int error, allerror = 0; 687 688 /* 689 * Force stale buffer cache information to be flushed. 690 */ 691 loop: 692 for (vp = mp->mnt_vnodelist.lh_first; 693 vp != NULL; 694 vp = vp->v_mntvnodes.le_next) { 695 /* 696 * If the vnode that we are about to sync is no longer 697 * associated with this mount point, start over. 698 */ 699 if (vp->v_mount != mp) 700 goto loop; 701 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 702 continue; 703 if (vget(vp, 1)) 704 goto loop; 705 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 706 allerror = error; 707 vput(vp); 708 } 709 return (allerror); 710 } 711 712 /* 713 * NFS flat namespace lookup. 714 * Currently unsupported. 715 */ 716 /* ARGSUSED */ 717 int 718 nfs_vget(mp, ino, vpp) 719 struct mount *mp; 720 ino_t ino; 721 struct vnode **vpp; 722 { 723 724 return (EOPNOTSUPP); 725 } 726 727 /* 728 * At this point, this should never happen 729 */ 730 /* ARGSUSED */ 731 int 732 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 733 register struct mount *mp; 734 struct fid *fhp; 735 struct mbuf *nam; 736 struct vnode **vpp; 737 int *exflagsp; 738 struct ucred **credanonp; 739 { 740 741 return (EINVAL); 742 } 743 744 /* 745 * Vnode pointer to File handle, should never happen either 746 */ 747 /* ARGSUSED */ 748 int 749 nfs_vptofh(vp, fhp) 750 struct vnode *vp; 751 struct fid *fhp; 752 { 753 754 return (EINVAL); 755 } 756 757 /* 758 * Vfs start routine, a no-op. 759 */ 760 /* ARGSUSED */ 761 int 762 nfs_start(mp, flags, p) 763 struct mount *mp; 764 int flags; 765 struct proc *p; 766 { 767 768 return (0); 769 } 770 771 /* 772 * Do operations associated with quotas, not supported 773 */ 774 /* ARGSUSED */ 775 int 776 nfs_quotactl(mp, cmd, uid, arg, p) 777 struct mount *mp; 778 int cmd; 779 uid_t uid; 780 caddr_t arg; 781 struct proc *p; 782 { 783 784 return (EOPNOTSUPP); 785 } 786
Indexes created Wed Sep 24 22:09:59 GMT 2025