nfs_vfsops.c revision 1.21
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 * from: @(#)nfs_vfsops.c 8.3 (Berkeley) 1/4/94 37 * $Id: nfs_vfsops.c,v 1.21 1994/06/08 11:37:03 mycroft Exp $ 38 */ 39 40 #include <sys/param.h> 41 #include <sys/conf.h> 42 #include <sys/ioctl.h> 43 #include <sys/signal.h> 44 #include <sys/proc.h> 45 #include <sys/namei.h> 46 #include <sys/vnode.h> 47 #include <sys/kernel.h> 48 #include <sys/mount.h> 49 #include <sys/buf.h> 50 #include <sys/mbuf.h> 51 #include <sys/socket.h> 52 #include <sys/systm.h> 53 54 #include <net/if.h> 55 #include <net/route.h> 56 #include <netinet/in.h> 57 58 #include <nfs/rpcv2.h> 59 #include <nfs/nfsv2.h> 60 #include <nfs/nfsnode.h> 61 #include <nfs/nfsmount.h> 62 #include <nfs/nfs.h> 63 #include <nfs/xdr_subs.h> 64 #include <nfs/nfsm_subs.h> 65 #include <nfs/nfsdiskless.h> 66 #include <nfs/nqnfs.h> 67 68 /* 69 * nfs vfs operations. 70 */ 71 struct vfsops nfs_vfsops = { 72 MOUNT_NFS, 73 nfs_mount, 74 nfs_start, 75 nfs_unmount, 76 nfs_root, 77 nfs_quotactl, 78 nfs_statfs, 79 nfs_sync, 80 nfs_vget, 81 nfs_fhtovp, 82 nfs_vptofh, 83 nfs_init, 84 }; 85 86 /* 87 * This structure must be filled in by a primary bootstrap or bootstrap 88 * server for a diskless/dataless machine. It is initialized below just 89 * to ensure that it is allocated to initialized data (.data not .bss). 90 */ 91 struct nfs_diskless nfs_diskless = { 0 }; 92 93 extern u_long nfs_procids[NFS_NPROCS]; 94 extern u_long nfs_prog, nfs_vers; 95 void nfs_disconnect __P((struct nfsmount *)); 96 void nfsargs_ntoh __P((struct nfs_args *)); 97 static struct mount *nfs_mountdiskless __P((char *, char *, int, 98 struct sockaddr_in *, struct nfs_args *, register struct vnode **)); 99 100 #define TRUE 1 101 #define FALSE 0 102 103 /* 104 * nfs statfs call 105 */ 106 int 107 nfs_statfs(mp, sbp, p) 108 struct mount *mp; 109 register struct statfs *sbp; 110 struct proc *p; 111 { 112 register struct vnode *vp; 113 register struct nfsv2_statfs *sfp; 114 register caddr_t cp; 115 register long t1; 116 caddr_t bpos, dpos, cp2; 117 int error = 0, isnq; 118 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 119 struct nfsmount *nmp; 120 struct ucred *cred; 121 struct nfsnode *np; 122 123 nmp = VFSTONFS(mp); 124 isnq = (nmp->nm_flag & NFSMNT_NQNFS); 125 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 126 return (error); 127 vp = NFSTOV(np); 128 nfsstats.rpccnt[NFSPROC_STATFS]++; 129 cred = crget(); 130 cred->cr_ngroups = 1; 131 nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH); 132 nfsm_fhtom(vp); 133 nfsm_request(vp, NFSPROC_STATFS, p, cred); 134 nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq)); 135 #ifdef COMPAT_09 136 sbp->f_type = 2; 137 #else 138 sbp->f_type = 0; 139 #endif 140 sbp->f_flags = nmp->nm_flag; 141 sbp->f_iosize = NFS_MAXDGRAMDATA; 142 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); 143 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 144 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 145 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 146 if (isnq) { 147 sbp->f_files = fxdr_unsigned(long, sfp->sf_files); 148 sbp->f_ffree = fxdr_unsigned(long, sfp->sf_ffree); 149 } else { 150 sbp->f_files = 0; 151 sbp->f_ffree = 0; 152 } 153 if (sbp != &mp->mnt_stat) { 154 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 155 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 156 } 157 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 158 sbp->f_fstypename[MFSNAMELEN] = '\0'; 159 nfsm_reqdone; 160 vrele(vp); 161 crfree(cred); 162 return (error); 163 } 164 165 /* 166 * Mount a remote root fs via. nfs. This depends on the info in the 167 * nfs_diskless structure that has been filled in properly by some primary 168 * bootstrap. 169 * It goes something like this: 170 * - do enough of "ifconfig" by calling ifioctl() so that the system 171 * can talk to the server 172 * - If nfs_diskless.mygateway is filled in, use that address as 173 * a default gateway. 174 * - hand craft the swap nfs vnode hanging off a fake mount point 175 * if swdevt[0].sw_dev == NODEV 176 * - build the rootfs mount point and call mountnfs() to do the rest. 177 */ 178 int 179 nfs_mountroot() 180 { 181 register struct mount *mp; 182 register struct nfs_diskless *nd = &nfs_diskless; 183 struct socket *so; 184 struct vnode *vp; 185 struct proc *p = curproc; /* XXX */ 186 int error, i; 187 188 /* 189 * XXX time must be non-zero when we init the interface or else 190 * the arp code will wedge... 191 */ 192 if (time.tv_sec == 0) 193 time.tv_sec = 1; 194 195 #ifdef notyet 196 /* Set up swap credentials. */ 197 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 198 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 199 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 200 NGROUPS) 201 proc0.p_ucred->cr_ngroups = NGROUPS; 202 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 203 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 204 #endif 205 206 /* 207 * Do enough of ifconfig(8) so that the critical net interface can 208 * talk to the server. 209 */ 210 if (error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0)) 211 panic("nfs_mountroot: socreate: %d", error); 212 if (error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p)) 213 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 214 soclose(so); 215 216 /* 217 * If the gateway field is filled in, set it as the default route. 218 */ 219 if (nd->mygateway.sin_len != 0) { 220 struct sockaddr_in mask, sin; 221 222 bzero((caddr_t)&mask, sizeof(mask)); 223 sin = mask; 224 sin.sin_family = AF_INET; 225 sin.sin_len = sizeof(sin); 226 if (error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 227 (struct sockaddr *)&nd->mygateway, 228 (struct sockaddr *)&mask, 229 RTF_UP | RTF_GATEWAY, (struct rtentry **)0)) 230 panic("nfs_mountroot: RTM_ADD: %d", error); 231 } 232 233 /* 234 * If swapping to an nfs node (indicated by swdevt[0].sw_dev == NODEV): 235 * Create a fake mount point just for the swap vnode so that the 236 * swap file can be on a different server from the rootfs. 237 */ 238 if (swdevt[0].sw_dev == NODEV) { 239 nd->swap_args.fh = (nfsv2fh_t *)nd->swap_fh; 240 (void) nfs_mountdiskless(nd->swap_hostnam, "/swap", 0, 241 &nd->swap_saddr, &nd->swap_args, &vp); 242 243 /* 244 * Since the swap file is not the root dir of a file system, 245 * hack it to a regular file. 246 */ 247 vp->v_type = VREG; 248 vp->v_flag = 0; 249 swapdev_vp = vp; 250 VREF(vp); 251 swdevt[0].sw_vp = vp; 252 swdevt[0].sw_nblks = ntohl(nd->swap_nblks); 253 } else if (bdevvp(swapdev, &swapdev_vp)) 254 panic("nfs_mountroot: can't setup swapdev_vp"); 255 256 /* 257 * Create the rootfs mount point. 258 */ 259 nd->root_args.fh = (nfsv2fh_t *)nd->root_fh; 260 mp = nfs_mountdiskless(nd->root_hostnam, "/", MNT_RDONLY, 261 &nd->root_saddr, &nd->root_args, &vp); 262 263 if (vfs_lock(mp)) 264 panic("nfs_mountroot: vfs_lock"); 265 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 266 mp->mnt_flag |= MNT_ROOTFS; 267 mp->mnt_vnodecovered = NULLVP; 268 vfs_unlock(mp); 269 rootvp = vp; 270 271 /* 272 * This is not really an nfs issue, but it is much easier to 273 * set hostname here and then let the "/etc/rc.xxx" files 274 * mount the right /var based upon its preset value. 275 */ 276 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 277 hostname[MAXHOSTNAMELEN - 1] = '\0'; 278 for (i = 0; i < MAXHOSTNAMELEN; i++) 279 if (hostname[i] == '\0') 280 break; 281 hostnamelen = i; 282 inittodr(ntohl(nd->root_time)); 283 return (0); 284 } 285 286 /* 287 * Internal version of mount system call for diskless setup. 288 */ 289 static struct mount * 290 nfs_mountdiskless(path, which, mountflag, sin, args, vpp) 291 char *path; 292 char *which; 293 int mountflag; 294 struct sockaddr_in *sin; 295 struct nfs_args *args; 296 register struct vnode **vpp; 297 { 298 register struct mount *mp; 299 register struct mbuf *m; 300 register int error; 301 302 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 303 M_MOUNT, M_NOWAIT); 304 if (mp == NULL) 305 panic("nfs_mountroot: %s mount malloc", which); 306 bzero((char *)mp, (u_long)sizeof(struct mount)); 307 mp->mnt_op = &nfs_vfsops; 308 mp->mnt_flag = mountflag; 309 310 MGET(m, MT_SONAME, M_DONTWAIT); 311 if (m == NULL) 312 panic("nfs_mountroot: %s mount mbuf", which); 313 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len); 314 m->m_len = sin->sin_len; 315 nfsargs_ntoh(args); 316 if (error = mountnfs(args, mp, m, which, path, vpp)) 317 panic("nfs_mountroot: mount %s on %s: %d", path, which, error); 318 319 return (mp); 320 } 321 322 /* 323 * Convert the integer fields of the nfs_args structure from net byte order 324 * to host byte order. Called by nfs_mountroot() above. 325 */ 326 void 327 nfsargs_ntoh(nfsp) 328 register struct nfs_args *nfsp; 329 { 330 331 NTOHL(nfsp->sotype); 332 NTOHL(nfsp->proto); 333 NTOHL(nfsp->flags); 334 NTOHL(nfsp->wsize); 335 NTOHL(nfsp->rsize); 336 NTOHL(nfsp->timeo); 337 NTOHL(nfsp->retrans); 338 NTOHL(nfsp->maxgrouplist); 339 NTOHL(nfsp->readahead); 340 NTOHL(nfsp->leaseterm); 341 NTOHL(nfsp->deadthresh); 342 } 343 344 void 345 nfs_decode_args(nmp, argp) 346 struct nfsmount *nmp; 347 struct nfs_args *argp; 348 { 349 int s; 350 351 s = splnet(); 352 /* Update flags atomically. Don't change the lock bits. */ 353 nmp->nm_flag = 354 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 355 splx(s); 356 357 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 358 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 359 if (nmp->nm_timeo < NFS_MINTIMEO) 360 nmp->nm_timeo = NFS_MINTIMEO; 361 else if (nmp->nm_timeo > NFS_MAXTIMEO) 362 nmp->nm_timeo = NFS_MAXTIMEO; 363 } 364 365 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 366 nmp->nm_retry = argp->retrans; 367 if (nmp->nm_retry > NFS_MAXREXMIT) 368 nmp->nm_retry = NFS_MAXREXMIT; 369 } 370 371 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 372 nmp->nm_wsize = argp->wsize; 373 /* Round down to multiple of blocksize */ 374 nmp->nm_wsize &= ~0x1ff; 375 if (nmp->nm_wsize <= 0) 376 nmp->nm_wsize = 512; 377 else if (nmp->nm_wsize > NFS_MAXDATA) 378 nmp->nm_wsize = NFS_MAXDATA; 379 } 380 if (nmp->nm_wsize > MAXBSIZE) 381 nmp->nm_wsize = MAXBSIZE; 382 383 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 384 nmp->nm_rsize = argp->rsize; 385 /* Round down to multiple of blocksize */ 386 nmp->nm_rsize &= ~0x1ff; 387 if (nmp->nm_rsize <= 0) 388 nmp->nm_rsize = 512; 389 else if (nmp->nm_rsize > NFS_MAXDATA) 390 nmp->nm_rsize = NFS_MAXDATA; 391 } 392 if (nmp->nm_rsize > MAXBSIZE) 393 nmp->nm_rsize = MAXBSIZE; 394 395 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 396 argp->maxgrouplist <= NFS_MAXGRPS) 397 nmp->nm_numgrps = argp->maxgrouplist; 398 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 399 argp->readahead <= NFS_MAXRAHEAD) 400 nmp->nm_readahead = argp->readahead; 401 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 402 argp->leaseterm <= NQ_MAXLEASE) 403 nmp->nm_leaseterm = argp->leaseterm; 404 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 405 argp->deadthresh <= NQ_NEVERDEAD) 406 nmp->nm_deadthresh = argp->deadthresh; 407 } 408 409 /* 410 * VFS Operations. 411 * 412 * mount system call 413 * It seems a bit dumb to copyinstr() the host and path here and then 414 * bcopy() them in mountnfs(), but I wanted to detect errors before 415 * doing the sockargs() call because sockargs() allocates an mbuf and 416 * an error after that means that I have to release the mbuf. 417 */ 418 /* ARGSUSED */ 419 int 420 nfs_mount(mp, path, data, ndp, p) 421 struct mount *mp; 422 char *path; 423 caddr_t data; 424 struct nameidata *ndp; 425 struct proc *p; 426 { 427 int error; 428 struct nfs_args args; 429 struct mbuf *nam; 430 struct vnode *vp; 431 char pth[MNAMELEN], hst[MNAMELEN]; 432 u_int len; 433 nfsv2fh_t nfh; 434 435 if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) 436 return (error); 437 if (mp->mnt_flag & MNT_UPDATE) { 438 register struct nfsmount *nmp = VFSTONFS(mp); 439 440 if (nmp == NULL) 441 return (EIO); 442 nfs_decode_args(nmp, &args); 443 return (0); 444 } 445 if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) 446 return (error); 447 if (error = copyinstr(path, pth, MNAMELEN-1, &len)) 448 return (error); 449 bzero(&pth[len], MNAMELEN - len); 450 if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) 451 return (error); 452 bzero(&hst[len], MNAMELEN - len); 453 /* sockargs() call must be after above copyin() calls */ 454 if (error = sockargs(&nam, (caddr_t)args.addr, 455 args.addrlen, MT_SONAME)) 456 return (error); 457 args.fh = &nfh; 458 error = mountnfs(&args, mp, nam, pth, hst, &vp); 459 return (error); 460 } 461 462 /* 463 * Common code for mount and mountroot 464 */ 465 int 466 mountnfs(argp, mp, nam, pth, hst, vpp) 467 register struct nfs_args *argp; 468 register struct mount *mp; 469 struct mbuf *nam; 470 char *pth, *hst; 471 struct vnode **vpp; 472 { 473 register struct nfsmount *nmp; 474 struct nfsnode *np; 475 int error; 476 477 if (mp->mnt_flag & MNT_UPDATE) { 478 nmp = VFSTONFS(mp); 479 /* update paths, file handles, etc, here XXX */ 480 m_freem(nam); 481 return (0); 482 } else { 483 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 484 M_NFSMNT, M_WAITOK); 485 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 486 mp->mnt_data = (qaddr_t)nmp; 487 } 488 getnewfsid(mp, makefstype(MOUNT_NFS)); 489 nmp->nm_mountp = mp; 490 if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == 491 (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { 492 error = EPERM; 493 goto bad; 494 } 495 if (argp->flags & NFSMNT_NQNFS) 496 /* 497 * We have to set mnt_maxsymlink to a non-zero value so 498 * that COMPAT_43 routines will know that we are setting 499 * the d_type field in directories (and can zero it for 500 * unsuspecting binaries). 501 */ 502 mp->mnt_maxsymlinklen = 1; 503 nmp->nm_timeo = NFS_TIMEO; 504 nmp->nm_retry = NFS_RETRANS; 505 nmp->nm_wsize = NFS_WSIZE; 506 nmp->nm_rsize = NFS_RSIZE; 507 nmp->nm_numgrps = NFS_MAXGRPS; 508 nmp->nm_readahead = NFS_DEFRAHEAD; 509 nmp->nm_leaseterm = NQ_DEFLEASE; 510 nmp->nm_deadthresh = NQ_DEADTHRESH; 511 nmp->nm_tnext = (struct nfsnode *)nmp; 512 nmp->nm_tprev = (struct nfsnode *)nmp; 513 nmp->nm_inprog = NULLVP; 514 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 515 #ifdef COMPAT_09 516 mp->mnt_stat.f_type = 2; 517 #else 518 mp->mnt_stat.f_type = 0; 519 #endif 520 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 521 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 522 nmp->nm_nam = nam; 523 nfs_decode_args(nmp, argp); 524 525 /* Set up the sockets and per-host congestion */ 526 nmp->nm_sotype = argp->sotype; 527 nmp->nm_soproto = argp->proto; 528 529 /* 530 * For Connection based sockets (TCP,...) defer the connect until 531 * the first request, in case the server is not responding. 532 */ 533 if (nmp->nm_sotype == SOCK_DGRAM && 534 (error = nfs_connect(nmp, (struct nfsreq *)0))) 535 goto bad; 536 537 /* 538 * This is silly, but it has to be set so that vinifod() works. 539 * We do not want to do an nfs_statfs() here since we can get 540 * stuck on a dead server and we are holding a lock on the mount 541 * point. 542 */ 543 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 544 /* 545 * A reference count is needed on the nfsnode representing the 546 * remote root. If this object is not persistent, then backward 547 * traversals of the mount point (i.e. "..") will not work if 548 * the nfsnode gets flushed out of the cache. Ufs does not have 549 * this problem, because one can identify root inodes by their 550 * number == ROOTINO (2). 551 */ 552 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 553 goto bad; 554 *vpp = NFSTOV(np); 555 556 return (0); 557 bad: 558 nfs_disconnect(nmp); 559 free((caddr_t)nmp, M_NFSMNT); 560 m_freem(nam); 561 return (error); 562 } 563 564 /* 565 * unmount system call 566 */ 567 int 568 nfs_unmount(mp, mntflags, p) 569 struct mount *mp; 570 int mntflags; 571 struct proc *p; 572 { 573 register struct nfsmount *nmp; 574 struct nfsnode *np; 575 struct vnode *vp; 576 int error, flags = 0; 577 extern int doforce; 578 579 if (mntflags & MNT_FORCE) { 580 if (!doforce || (mp->mnt_flag & MNT_ROOTFS)) 581 return (EINVAL); 582 flags |= FORCECLOSE; 583 } 584 nmp = VFSTONFS(mp); 585 /* 586 * Goes something like this.. 587 * - Check for activity on the root vnode (other than ourselves). 588 * - Call vflush() to clear out vnodes for this file system, 589 * except for the root vnode. 590 * - Decrement reference on the vnode representing remote root. 591 * - Close the socket 592 * - Free up the data structures 593 */ 594 /* 595 * We need to decrement the ref. count on the nfsnode representing 596 * the remote root. See comment in mountnfs(). The VFS unmount() 597 * has done vput on this vnode, otherwise we would get deadlock! 598 */ 599 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 600 return(error); 601 vp = NFSTOV(np); 602 if (vp->v_usecount > 2) { 603 vput(vp); 604 return (EBUSY); 605 } 606 607 /* 608 * Must handshake with nqnfs_clientd() if it is active. 609 */ 610 nmp->nm_flag |= NFSMNT_DISMINPROG; 611 while (nmp->nm_inprog != NULLVP) 612 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 613 if (error = vflush(mp, vp, flags)) { 614 vput(vp); 615 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 616 return (error); 617 } 618 619 /* 620 * We are now committed to the unmount. 621 * For NQNFS, let the server daemon free the nfsmount structure. 622 */ 623 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 624 nmp->nm_flag |= NFSMNT_DISMNT; 625 626 /* 627 * There are two reference counts to get rid of here. 628 */ 629 vrele(vp); 630 vrele(vp); 631 vgone(vp); 632 nfs_disconnect(nmp); 633 m_freem(nmp->nm_nam); 634 635 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 636 free((caddr_t)nmp, M_NFSMNT); 637 return (0); 638 } 639 640 /* 641 * Return root of a filesystem 642 */ 643 int 644 nfs_root(mp, vpp) 645 struct mount *mp; 646 struct vnode **vpp; 647 { 648 register struct vnode *vp; 649 struct nfsmount *nmp; 650 struct nfsnode *np; 651 int error; 652 653 nmp = VFSTONFS(mp); 654 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 655 return (error); 656 vp = NFSTOV(np); 657 vp->v_type = VDIR; 658 vp->v_flag = VROOT; 659 *vpp = vp; 660 return (0); 661 } 662 663 extern int syncprt; 664 665 /* 666 * Flush out the buffer cache 667 */ 668 /* ARGSUSED */ 669 int 670 nfs_sync(mp, waitfor, cred, p) 671 struct mount *mp; 672 int waitfor; 673 struct ucred *cred; 674 struct proc *p; 675 { 676 register struct vnode *vp; 677 int error, allerror = 0; 678 679 /* 680 * Force stale buffer cache information to be flushed. 681 */ 682 loop: 683 for (vp = mp->mnt_vnodelist.lh_first; 684 vp != NULL; 685 vp = vp->v_mntvnodes.le_next) { 686 /* 687 * If the vnode that we are about to sync is no longer 688 * associated with this mount point, start over. 689 */ 690 if (vp->v_mount != mp) 691 goto loop; 692 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 693 continue; 694 if (vget(vp, 1)) 695 goto loop; 696 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 697 allerror = error; 698 vput(vp); 699 } 700 return (allerror); 701 } 702 703 /* 704 * NFS flat namespace lookup. 705 * Currently unsupported. 706 */ 707 /* ARGSUSED */ 708 int 709 nfs_vget(mp, ino, vpp) 710 struct mount *mp; 711 ino_t ino; 712 struct vnode **vpp; 713 { 714 715 return (EOPNOTSUPP); 716 } 717 718 /* 719 * At this point, this should never happen 720 */ 721 /* ARGSUSED */ 722 int 723 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 724 register struct mount *mp; 725 struct fid *fhp; 726 struct mbuf *nam; 727 struct vnode **vpp; 728 int *exflagsp; 729 struct ucred **credanonp; 730 { 731 732 return (EINVAL); 733 } 734 735 /* 736 * Vnode pointer to File handle, should never happen either 737 */ 738 /* ARGSUSED */ 739 int 740 nfs_vptofh(vp, fhp) 741 struct vnode *vp; 742 struct fid *fhp; 743 { 744 745 return (EINVAL); 746 } 747 748 /* 749 * Vfs start routine, a no-op. 750 */ 751 /* ARGSUSED */ 752 int 753 nfs_start(mp, flags, p) 754 struct mount *mp; 755 int flags; 756 struct proc *p; 757 { 758 759 return (0); 760 } 761 762 /* 763 * Do operations associated with quotas, not supported 764 */ 765 /* ARGSUSED */ 766 int 767 nfs_quotactl(mp, cmd, uid, arg, p) 768 struct mount *mp; 769 int cmd; 770 uid_t uid; 771 caddr_t arg; 772 struct proc *p; 773 { 774 775 return (EOPNOTSUPP); 776 } 777
Indexes created Fri Sep 26 20:09:58 GMT 2025