nfs_vfsops.c revision 1.22
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 1.22 1994/06/13 15:29:01 gwr 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 extern u_long nfs_procids[NFS_NPROCS]; 87 extern u_long nfs_prog, nfs_vers; 88 void nfs_disconnect __P((struct nfsmount *)); 89 90 static struct mount * 91 nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); 92 93 #define TRUE 1 94 #define FALSE 0 95 96 /* 97 * nfs statfs call 98 */ 99 int 100 nfs_statfs(mp, sbp, p) 101 struct mount *mp; 102 register struct statfs *sbp; 103 struct proc *p; 104 { 105 register struct vnode *vp; 106 register struct nfsv2_statfs *sfp; 107 register caddr_t cp; 108 register long t1; 109 caddr_t bpos, dpos, cp2; 110 int error = 0, isnq; 111 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 112 struct nfsmount *nmp; 113 struct ucred *cred; 114 struct nfsnode *np; 115 116 nmp = VFSTONFS(mp); 117 isnq = (nmp->nm_flag & NFSMNT_NQNFS); 118 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 119 return (error); 120 vp = NFSTOV(np); 121 nfsstats.rpccnt[NFSPROC_STATFS]++; 122 cred = crget(); 123 cred->cr_ngroups = 1; 124 nfsm_reqhead(vp, NFSPROC_STATFS, NFSX_FH); 125 nfsm_fhtom(vp); 126 nfsm_request(vp, NFSPROC_STATFS, p, cred); 127 nfsm_dissect(sfp, struct nfsv2_statfs *, NFSX_STATFS(isnq)); 128 #ifdef COMPAT_09 129 sbp->f_type = 2; 130 #else 131 sbp->f_type = 0; 132 #endif 133 sbp->f_flags = nmp->nm_flag; 134 sbp->f_iosize = NFS_MAXDGRAMDATA; 135 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); 136 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 137 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 138 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 139 if (isnq) { 140 sbp->f_files = fxdr_unsigned(long, sfp->sf_files); 141 sbp->f_ffree = fxdr_unsigned(long, sfp->sf_ffree); 142 } else { 143 sbp->f_files = 0; 144 sbp->f_ffree = 0; 145 } 146 if (sbp != &mp->mnt_stat) { 147 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 148 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 149 } 150 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 151 sbp->f_fstypename[MFSNAMELEN] = '\0'; 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 * Call nfs_boot_init() to fill in the nfs_diskless struct. 182 * Side effect: Finds and configures a network interface. 183 */ 184 bzero((caddr_t) &nd, sizeof(nd)); 185 nfs_boot_init(&nd, procp); 186 187 /* 188 * Create the root mount point. 189 */ 190 mp = nfs_mount_diskless(&nd.nd_root, "/", MNT_RDONLY, &vp); 191 192 /* 193 * Link it into the mount list. 194 */ 195 if (vfs_lock(mp)) 196 panic("nfs_mountroot: vfs_lock"); 197 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 198 mp->mnt_flag |= MNT_ROOTFS; 199 mp->mnt_vnodecovered = NULLVP; 200 vfs_unlock(mp); 201 rootvp = vp; 202 203 204 /* Get root attributes (for the time). */ 205 error = VOP_GETATTR(vp, &attr, procp->p_cred->pc_ucred, procp); 206 if (error) panic("nfs_mountroot: getattr for root"); 207 n = attr.va_mtime.ts_sec; /* XXX - Always zero. Why? -gwr */ 208 printf(" root time: 0x%x\n", n); 209 inittodr(n); 210 211 #ifdef notyet 212 /* Set up swap credentials. */ 213 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 214 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 215 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 216 NGROUPS) 217 proc0.p_ucred->cr_ngroups = NGROUPS; 218 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 219 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 220 #endif 221 222 /* 223 * "Mount" the swap device. 224 * 225 * On a "dataless" configuration (swap on disk) we will have: 226 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 227 */ 228 if (swdevt[0].sw_dev != NODEV) { 229 if (bdevvp(swapdev, &swapdev_vp)) 230 panic("nfs_mountroot: can't get swap vp for dev %d,%d", 231 major(swdevt[0].sw_dev), minor(swdevt[0].sw_dev)); 232 return (0); 233 } 234 235 /* 236 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 237 * Create a fake mount point just for the swap vnode so that the 238 * swap file can be on a different server from the rootfs. 239 */ 240 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 241 242 /* 243 * Since the swap file is not the root dir of a file system, 244 * hack it to a regular file. 245 */ 246 vp->v_type = VREG; 247 vp->v_flag = 0; 248 swapdev_vp = vp; 249 VREF(vp); 250 swdevt[0].sw_vp = vp; 251 252 /* 253 * Find out how large the swap file is. 254 */ 255 error = VOP_GETATTR(vp, &attr, procp->p_cred->pc_ucred, procp); 256 if (error) panic("nfs_mountroot: getattr for swap"); 257 n = (long) (attr.va_size / DEV_BSIZE); 258 printf(" swap size: 0x%x (blocks)\n", n); /* XXX */ 259 swdevt[0].sw_nblks = n; 260 261 return (0); 262 } 263 264 /* 265 * Internal version of mount system call for diskless setup. 266 */ 267 static struct mount * 268 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 269 struct nfs_dlmount *ndmntp; 270 char *mntname; 271 int mntflag; 272 struct vnode **vpp; 273 { 274 struct nfs_args args; 275 struct mount *mp; 276 struct mbuf *m; 277 int error; 278 279 /* Create the mount point. */ 280 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 281 M_MOUNT, M_NOWAIT); 282 if (mp == NULL) 283 panic("nfs_mountroot: malloc mount for %s", mntname); 284 bzero((char *)mp, (u_long)sizeof(struct mount)); 285 mp->mnt_op = &nfs_vfsops; 286 mp->mnt_flag = mntflag; 287 288 /* Initialize mount args. */ 289 bzero((caddr_t) &args, sizeof(args)); 290 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 291 args.addrlen = args.addr->sa_len; 292 args.sotype = SOCK_DGRAM; 293 args.fh = (nfsv2fh_t *)ndmntp->ndm_fh; 294 args.hostname = ndmntp->ndm_host; 295 296 /* Get mbuf for server sockaddr. */ 297 MGET(m, MT_SONAME, M_DONTWAIT); 298 if (m == NULL) 299 panic("nfs_mountroot: mget soname for %s", mntname); 300 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 301 (m->m_len = args.addr->sa_len)); 302 303 if (error = mountnfs(&args, mp, m, mntname, args.hostname, vpp)) 304 panic("nfs_mountroot: mount %s failed: %d", mntname); 305 306 return (mp); 307 } 308 309 void 310 nfs_decode_args(nmp, argp) 311 struct nfsmount *nmp; 312 struct nfs_args *argp; 313 { 314 int s; 315 316 s = splnet(); 317 /* Update flags atomically. Don't change the lock bits. */ 318 nmp->nm_flag = 319 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 320 splx(s); 321 322 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 323 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 324 if (nmp->nm_timeo < NFS_MINTIMEO) 325 nmp->nm_timeo = NFS_MINTIMEO; 326 else if (nmp->nm_timeo > NFS_MAXTIMEO) 327 nmp->nm_timeo = NFS_MAXTIMEO; 328 } 329 330 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 331 nmp->nm_retry = argp->retrans; 332 if (nmp->nm_retry > NFS_MAXREXMIT) 333 nmp->nm_retry = NFS_MAXREXMIT; 334 } 335 336 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 337 nmp->nm_wsize = argp->wsize; 338 /* Round down to multiple of blocksize */ 339 nmp->nm_wsize &= ~0x1ff; 340 if (nmp->nm_wsize <= 0) 341 nmp->nm_wsize = 512; 342 else if (nmp->nm_wsize > NFS_MAXDATA) 343 nmp->nm_wsize = NFS_MAXDATA; 344 } 345 if (nmp->nm_wsize > MAXBSIZE) 346 nmp->nm_wsize = MAXBSIZE; 347 348 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 349 nmp->nm_rsize = argp->rsize; 350 /* Round down to multiple of blocksize */ 351 nmp->nm_rsize &= ~0x1ff; 352 if (nmp->nm_rsize <= 0) 353 nmp->nm_rsize = 512; 354 else if (nmp->nm_rsize > NFS_MAXDATA) 355 nmp->nm_rsize = NFS_MAXDATA; 356 } 357 if (nmp->nm_rsize > MAXBSIZE) 358 nmp->nm_rsize = MAXBSIZE; 359 360 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 361 argp->maxgrouplist <= NFS_MAXGRPS) 362 nmp->nm_numgrps = argp->maxgrouplist; 363 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 364 argp->readahead <= NFS_MAXRAHEAD) 365 nmp->nm_readahead = argp->readahead; 366 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 367 argp->leaseterm <= NQ_MAXLEASE) 368 nmp->nm_leaseterm = argp->leaseterm; 369 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 370 argp->deadthresh <= NQ_NEVERDEAD) 371 nmp->nm_deadthresh = argp->deadthresh; 372 } 373 374 /* 375 * VFS Operations. 376 * 377 * mount system call 378 * It seems a bit dumb to copyinstr() the host and path here and then 379 * bcopy() them in mountnfs(), but I wanted to detect errors before 380 * doing the sockargs() call because sockargs() allocates an mbuf and 381 * an error after that means that I have to release the mbuf. 382 */ 383 /* ARGSUSED */ 384 int 385 nfs_mount(mp, path, data, ndp, p) 386 struct mount *mp; 387 char *path; 388 caddr_t data; 389 struct nameidata *ndp; 390 struct proc *p; 391 { 392 int error; 393 struct nfs_args args; 394 struct mbuf *nam; 395 struct vnode *vp; 396 char pth[MNAMELEN], hst[MNAMELEN]; 397 u_int len; 398 nfsv2fh_t nfh; 399 400 if (error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args))) 401 return (error); 402 if (mp->mnt_flag & MNT_UPDATE) { 403 register struct nfsmount *nmp = VFSTONFS(mp); 404 405 if (nmp == NULL) 406 return (EIO); 407 nfs_decode_args(nmp, &args); 408 return (0); 409 } 410 if (error = copyin((caddr_t)args.fh, (caddr_t)&nfh, sizeof (nfsv2fh_t))) 411 return (error); 412 if (error = copyinstr(path, pth, MNAMELEN-1, &len)) 413 return (error); 414 bzero(&pth[len], MNAMELEN - len); 415 if (error = copyinstr(args.hostname, hst, MNAMELEN-1, &len)) 416 return (error); 417 bzero(&hst[len], MNAMELEN - len); 418 /* sockargs() call must be after above copyin() calls */ 419 if (error = sockargs(&nam, (caddr_t)args.addr, 420 args.addrlen, MT_SONAME)) 421 return (error); 422 args.fh = &nfh; 423 error = mountnfs(&args, mp, nam, pth, hst, &vp); 424 return (error); 425 } 426 427 /* 428 * Common code for mount and mountroot 429 */ 430 int 431 mountnfs(argp, mp, nam, pth, hst, vpp) 432 register struct nfs_args *argp; 433 register struct mount *mp; 434 struct mbuf *nam; 435 char *pth, *hst; 436 struct vnode **vpp; 437 { 438 register struct nfsmount *nmp; 439 struct nfsnode *np; 440 int error; 441 442 if (mp->mnt_flag & MNT_UPDATE) { 443 nmp = VFSTONFS(mp); 444 /* update paths, file handles, etc, here XXX */ 445 m_freem(nam); 446 return (0); 447 } else { 448 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 449 M_NFSMNT, M_WAITOK); 450 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 451 mp->mnt_data = (qaddr_t)nmp; 452 } 453 getnewfsid(mp, makefstype(MOUNT_NFS)); 454 nmp->nm_mountp = mp; 455 if ((argp->flags & (NFSMNT_NQNFS | NFSMNT_MYWRITE)) == 456 (NFSMNT_NQNFS | NFSMNT_MYWRITE)) { 457 error = EPERM; 458 goto bad; 459 } 460 if (argp->flags & NFSMNT_NQNFS) 461 /* 462 * We have to set mnt_maxsymlink to a non-zero value so 463 * that COMPAT_43 routines will know that we are setting 464 * the d_type field in directories (and can zero it for 465 * unsuspecting binaries). 466 */ 467 mp->mnt_maxsymlinklen = 1; 468 nmp->nm_timeo = NFS_TIMEO; 469 nmp->nm_retry = NFS_RETRANS; 470 nmp->nm_wsize = NFS_WSIZE; 471 nmp->nm_rsize = NFS_RSIZE; 472 nmp->nm_numgrps = NFS_MAXGRPS; 473 nmp->nm_readahead = NFS_DEFRAHEAD; 474 nmp->nm_leaseterm = NQ_DEFLEASE; 475 nmp->nm_deadthresh = NQ_DEADTHRESH; 476 nmp->nm_tnext = (struct nfsnode *)nmp; 477 nmp->nm_tprev = (struct nfsnode *)nmp; 478 nmp->nm_inprog = NULLVP; 479 bcopy((caddr_t)argp->fh, (caddr_t)&nmp->nm_fh, sizeof(nfsv2fh_t)); 480 #ifdef COMPAT_09 481 mp->mnt_stat.f_type = 2; 482 #else 483 mp->mnt_stat.f_type = 0; 484 #endif 485 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 486 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 487 nmp->nm_nam = nam; 488 nfs_decode_args(nmp, argp); 489 490 /* Set up the sockets and per-host congestion */ 491 nmp->nm_sotype = argp->sotype; 492 nmp->nm_soproto = argp->proto; 493 494 /* 495 * For Connection based sockets (TCP,...) defer the connect until 496 * the first request, in case the server is not responding. 497 */ 498 if (nmp->nm_sotype == SOCK_DGRAM && 499 (error = nfs_connect(nmp, (struct nfsreq *)0))) 500 goto bad; 501 502 /* 503 * This is silly, but it has to be set so that vinifod() works. 504 * We do not want to do an nfs_statfs() here since we can get 505 * stuck on a dead server and we are holding a lock on the mount 506 * point. 507 */ 508 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 509 /* 510 * A reference count is needed on the nfsnode representing the 511 * remote root. If this object is not persistent, then backward 512 * traversals of the mount point (i.e. "..") will not work if 513 * the nfsnode gets flushed out of the cache. Ufs does not have 514 * this problem, because one can identify root inodes by their 515 * number == ROOTINO (2). 516 */ 517 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 518 goto bad; 519 *vpp = NFSTOV(np); 520 521 return (0); 522 bad: 523 nfs_disconnect(nmp); 524 free((caddr_t)nmp, M_NFSMNT); 525 m_freem(nam); 526 return (error); 527 } 528 529 /* 530 * unmount system call 531 */ 532 int 533 nfs_unmount(mp, mntflags, p) 534 struct mount *mp; 535 int mntflags; 536 struct proc *p; 537 { 538 register struct nfsmount *nmp; 539 struct nfsnode *np; 540 struct vnode *vp; 541 int error, flags = 0; 542 extern int doforce; 543 544 if (mntflags & MNT_FORCE) { 545 if (!doforce || (mp->mnt_flag & MNT_ROOTFS)) 546 return (EINVAL); 547 flags |= FORCECLOSE; 548 } 549 nmp = VFSTONFS(mp); 550 /* 551 * Goes something like this.. 552 * - Check for activity on the root vnode (other than ourselves). 553 * - Call vflush() to clear out vnodes for this file system, 554 * except for the root vnode. 555 * - Decrement reference on the vnode representing remote root. 556 * - Close the socket 557 * - Free up the data structures 558 */ 559 /* 560 * We need to decrement the ref. count on the nfsnode representing 561 * the remote root. See comment in mountnfs(). The VFS unmount() 562 * has done vput on this vnode, otherwise we would get deadlock! 563 */ 564 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 565 return(error); 566 vp = NFSTOV(np); 567 if (vp->v_usecount > 2) { 568 vput(vp); 569 return (EBUSY); 570 } 571 572 /* 573 * Must handshake with nqnfs_clientd() if it is active. 574 */ 575 nmp->nm_flag |= NFSMNT_DISMINPROG; 576 while (nmp->nm_inprog != NULLVP) 577 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 578 if (error = vflush(mp, vp, flags)) { 579 vput(vp); 580 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 581 return (error); 582 } 583 584 /* 585 * We are now committed to the unmount. 586 * For NQNFS, let the server daemon free the nfsmount structure. 587 */ 588 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 589 nmp->nm_flag |= NFSMNT_DISMNT; 590 591 /* 592 * There are two reference counts to get rid of here. 593 */ 594 vrele(vp); 595 vrele(vp); 596 vgone(vp); 597 nfs_disconnect(nmp); 598 m_freem(nmp->nm_nam); 599 600 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 601 free((caddr_t)nmp, M_NFSMNT); 602 return (0); 603 } 604 605 /* 606 * Return root of a filesystem 607 */ 608 int 609 nfs_root(mp, vpp) 610 struct mount *mp; 611 struct vnode **vpp; 612 { 613 register struct vnode *vp; 614 struct nfsmount *nmp; 615 struct nfsnode *np; 616 int error; 617 618 nmp = VFSTONFS(mp); 619 if (error = nfs_nget(mp, &nmp->nm_fh, &np)) 620 return (error); 621 vp = NFSTOV(np); 622 vp->v_type = VDIR; 623 vp->v_flag = VROOT; 624 *vpp = vp; 625 return (0); 626 } 627 628 extern int syncprt; 629 630 /* 631 * Flush out the buffer cache 632 */ 633 /* ARGSUSED */ 634 int 635 nfs_sync(mp, waitfor, cred, p) 636 struct mount *mp; 637 int waitfor; 638 struct ucred *cred; 639 struct proc *p; 640 { 641 register struct vnode *vp; 642 int error, allerror = 0; 643 644 /* 645 * Force stale buffer cache information to be flushed. 646 */ 647 loop: 648 for (vp = mp->mnt_vnodelist.lh_first; 649 vp != NULL; 650 vp = vp->v_mntvnodes.le_next) { 651 /* 652 * If the vnode that we are about to sync is no longer 653 * associated with this mount point, start over. 654 */ 655 if (vp->v_mount != mp) 656 goto loop; 657 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 658 continue; 659 if (vget(vp, 1)) 660 goto loop; 661 if (error = VOP_FSYNC(vp, cred, waitfor, p)) 662 allerror = error; 663 vput(vp); 664 } 665 return (allerror); 666 } 667 668 /* 669 * NFS flat namespace lookup. 670 * Currently unsupported. 671 */ 672 /* ARGSUSED */ 673 int 674 nfs_vget(mp, ino, vpp) 675 struct mount *mp; 676 ino_t ino; 677 struct vnode **vpp; 678 { 679 680 return (EOPNOTSUPP); 681 } 682 683 /* 684 * At this point, this should never happen 685 */ 686 /* ARGSUSED */ 687 int 688 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 689 register struct mount *mp; 690 struct fid *fhp; 691 struct mbuf *nam; 692 struct vnode **vpp; 693 int *exflagsp; 694 struct ucred **credanonp; 695 { 696 697 return (EINVAL); 698 } 699 700 /* 701 * Vnode pointer to File handle, should never happen either 702 */ 703 /* ARGSUSED */ 704 int 705 nfs_vptofh(vp, fhp) 706 struct vnode *vp; 707 struct fid *fhp; 708 { 709 710 return (EINVAL); 711 } 712 713 /* 714 * Vfs start routine, a no-op. 715 */ 716 /* ARGSUSED */ 717 int 718 nfs_start(mp, flags, p) 719 struct mount *mp; 720 int flags; 721 struct proc *p; 722 { 723 724 return (0); 725 } 726 727 /* 728 * Do operations associated with quotas, not supported 729 */ 730 /* ARGSUSED */ 731 int 732 nfs_quotactl(mp, cmd, uid, arg, p) 733 struct mount *mp; 734 int cmd; 735 uid_t uid; 736 caddr_t arg; 737 struct proc *p; 738 { 739 740 return (EOPNOTSUPP); 741 } 742
Indexes created Fri Sep 26 20:09:58 GMT 2025