nfs_vfsops.c revision 1.43
1 /* $NetBSD: nfs_vfsops.c,v 1.43 1996/02/18 11:53:56 fvdl Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993, 1995 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 8.12 (Berkeley) 5/20/95 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/nfsproto.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfs.h> 64 #include <nfs/nfsmount.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 struct nfsstats nfsstats; 72 extern int nfs_ticks; 73 74 #ifdef notyet 75 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 76 struct proc *); 77 #endif 78 79 /* 80 * nfs vfs operations. 81 */ 82 struct vfsops nfs_vfsops = { 83 MOUNT_NFS, 84 nfs_mount, 85 nfs_start, 86 nfs_unmount, 87 nfs_root, 88 nfs_quotactl, 89 nfs_statfs, 90 nfs_sync, 91 nfs_vget, 92 nfs_fhtovp, 93 nfs_vptofh, 94 nfs_init, 95 #ifdef notyet 96 nfs_sysctl 97 #endif 98 }; 99 100 extern u_int32_t nfs_procids[NFS_NPROCS]; 101 extern u_int32_t nfs_prog, nfs_vers; 102 103 static struct mount * 104 nfs_mount_diskless __P((struct nfs_dlmount *, char *, int, struct vnode **)); 105 106 #define TRUE 1 107 #define FALSE 0 108 109 /* 110 * nfs statfs call 111 */ 112 int 113 nfs_statfs(mp, sbp, p) 114 struct mount *mp; 115 register struct statfs *sbp; 116 struct proc *p; 117 { 118 register struct vnode *vp; 119 register struct nfs_statfs *sfp; 120 register caddr_t cp; 121 register u_int32_t *tl; 122 register int32_t t1, t2; 123 caddr_t bpos, dpos, cp2; 124 struct nfsmount *nmp = VFSTONFS(mp); 125 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 126 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 127 struct ucred *cred; 128 struct nfsnode *np; 129 u_quad_t tquad; 130 131 #ifndef nolint 132 sfp = (struct nfs_statfs *)0; 133 #endif 134 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 135 if (error) 136 return (error); 137 vp = NFSTOV(np); 138 cred = crget(); 139 cred->cr_ngroups = 0; 140 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 141 (void)nfs_fsinfo(nmp, vp, cred, p); 142 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 143 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 144 nfsm_fhtom(vp, v3); 145 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 146 if (v3) 147 nfsm_postop_attr(vp, retattr); 148 if (!error) 149 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 150 #ifdef COMPAT_09 151 sbp->f_type = 2; 152 #else 153 sbp->f_type = 0; 154 #endif 155 sbp->f_flags = nmp->nm_flag; 156 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 157 if (v3) { 158 sbp->f_bsize = NFS_FABLKSIZE; 159 fxdr_hyper(&sfp->sf_tbytes, &tquad); 160 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 161 fxdr_hyper(&sfp->sf_fbytes, &tquad); 162 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 163 fxdr_hyper(&sfp->sf_abytes, &tquad); 164 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 165 sbp->f_files = (fxdr_unsigned(int32_t, 166 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 167 sbp->f_ffree = (fxdr_unsigned(int32_t, 168 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 169 } else { 170 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 171 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 172 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 173 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 174 sbp->f_files = 0; 175 sbp->f_ffree = 0; 176 } 177 if (sbp != &mp->mnt_stat) { 178 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 179 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 180 } 181 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 182 nfsm_reqdone; 183 vrele(vp); 184 crfree(cred); 185 return (error); 186 } 187 188 /* 189 * nfs version 3 fsinfo rpc call 190 */ 191 int 192 nfs_fsinfo(nmp, vp, cred, p) 193 register struct nfsmount *nmp; 194 register struct vnode *vp; 195 struct ucred *cred; 196 struct proc *p; 197 { 198 register struct nfsv3_fsinfo *fsp; 199 register caddr_t cp; 200 register int32_t t1, t2; 201 register u_int32_t *tl, pref, max; 202 caddr_t bpos, dpos, cp2; 203 int error = 0, retattr; 204 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 205 206 nfsstats.rpccnt[NFSPROC_FSINFO]++; 207 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 208 nfsm_fhtom(vp, 1); 209 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 210 nfsm_postop_attr(vp, retattr); 211 if (!error) { 212 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 213 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 214 if (pref < nmp->nm_wsize) 215 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 216 ~(NFS_FABLKSIZE - 1); 217 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 218 if (max < nmp->nm_wsize) { 219 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 220 if (nmp->nm_wsize == 0) 221 nmp->nm_wsize = max; 222 } 223 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 224 if (pref < nmp->nm_rsize) 225 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 226 ~(NFS_FABLKSIZE - 1); 227 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 228 if (max < nmp->nm_rsize) { 229 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 230 if (nmp->nm_rsize == 0) 231 nmp->nm_rsize = max; 232 } 233 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 234 if (pref < nmp->nm_readdirsize) 235 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 236 ~(NFS_DIRBLKSIZ - 1); 237 if (max < nmp->nm_readdirsize) { 238 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 239 if (nmp->nm_readdirsize == 0) 240 nmp->nm_readdirsize = max; 241 } 242 nmp->nm_flag |= NFSMNT_GOTFSINFO; 243 } 244 nfsm_reqdone; 245 return (error); 246 } 247 248 /* 249 * Mount a remote root fs via. NFS. It goes like this: 250 * - Call nfs_boot_init() to fill in the nfs_diskless struct 251 * (using RARP, bootparam RPC, mountd RPC) 252 * - hand craft the swap nfs vnode hanging off a fake mount point 253 * if swdevt[0].sw_dev == NODEV 254 * - build the rootfs mount point and call mountnfs() to do the rest. 255 */ 256 int 257 nfs_mountroot() 258 { 259 struct nfs_diskless nd; 260 struct vattr attr; 261 struct mount *mp; 262 struct vnode *vp; 263 struct proc *procp; 264 long n; 265 int error; 266 267 procp = curproc; /* XXX */ 268 269 /* 270 * XXX time must be non-zero when we init the interface or else 271 * the arp code will wedge. [Fixed now in if_ether.c] 272 * However, the NFS attribute cache gives false "hits" when 273 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 274 */ 275 if (time.tv_sec < NFS_MAXATTRTIMO) 276 time.tv_sec = NFS_MAXATTRTIMO; 277 278 /* 279 * Call nfs_boot_init() to fill in the nfs_diskless struct. 280 * Side effect: Finds and configures a network interface. 281 */ 282 bzero((caddr_t) &nd, sizeof(nd)); 283 nfs_boot_init(&nd, procp); 284 285 /* 286 * Create the root mount point. 287 */ 288 nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root); 289 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 290 printf("root on %s\n", nd.nd_root.ndm_host); 291 292 /* 293 * Link it into the mount list. 294 */ 295 #ifdef Lite2_integrated 296 simple_lock(&mountlist_slock); 297 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 298 simple_unlock(&mountlist_slock); 299 rootvp = vp; 300 vfs_unbusy(mp, procp); 301 #else 302 if (vfs_lock(mp)) 303 panic("nfs_mountroot: vfs_lock"); 304 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 305 mp->mnt_vnodecovered = NULLVP; 306 vfs_unlock(mp); 307 rootvp = vp; 308 #endif 309 310 /* Get root attributes (for the time). */ 311 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 312 if (error) panic("nfs_mountroot: getattr for root"); 313 n = attr.va_mtime.tv_sec; 314 #ifdef DEBUG 315 printf("root time: 0x%x\n", n); 316 #endif 317 inittodr(n); 318 319 /* 320 * XXX splnet, so networks will receive... 321 */ 322 splnet(); 323 324 #ifdef notyet 325 /* Set up swap credentials. */ 326 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 327 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 328 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 329 NGROUPS) 330 proc0.p_ucred->cr_ngroups = NGROUPS; 331 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 332 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 333 #endif 334 335 /* 336 * "Mount" the swap device. 337 * 338 * On a "dataless" configuration (swap on disk) we will have: 339 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 340 */ 341 if (bdevvp(swapdev, &swapdev_vp)) 342 panic("nfs_mountroot: can't setup swap vp"); 343 if (swdevt[0].sw_dev != NODEV) { 344 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 345 return (0); 346 } 347 348 /* 349 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 350 * Create a fake mount point just for the swap vnode so that the 351 * swap file can be on a different server from the rootfs. 352 */ 353 nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap); 354 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 355 #ifdef Lite2_integrated 356 vfs_unbusy(mp, procp); 357 #endif 358 printf("swap on %s\n", nd.nd_swap.ndm_host); 359 360 /* 361 * Since the swap file is not the root dir of a file system, 362 * hack it to a regular file. 363 */ 364 vp->v_type = VREG; 365 vp->v_flag = 0; 366 swdevt[0].sw_vp = vp; 367 368 /* 369 * Find out how large the swap file is. 370 */ 371 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 372 if (error) 373 panic("nfs_mountroot: getattr for swap"); 374 n = (long) (attr.va_size >> DEV_BSHIFT); 375 #ifdef DEBUG 376 printf("swap size: 0x%x (blocks)\n", n); 377 #endif 378 swdevt[0].sw_nblks = n; 379 380 return (0); 381 } 382 383 /* 384 * Internal version of mount system call for diskless setup. 385 */ 386 static struct mount * 387 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 388 struct nfs_dlmount *ndmntp; 389 char *mntname; 390 int mntflag; 391 struct vnode **vpp; 392 { 393 struct nfs_args args; 394 struct mount *mp; 395 struct mbuf *m; 396 int error; 397 398 #ifdef Lite2_integrated 399 vfs_rootmountalloc("nfs", mntname, &mp); 400 #else 401 /* Create the mount point. */ 402 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 403 M_MOUNT, M_WAITOK); 404 if (mp == NULL) 405 panic("nfs_mountroot: malloc mount for %s", mntname); 406 bzero((char *)mp, (u_long)sizeof(struct mount)); 407 #endif 408 mp->mnt_op = &nfs_vfsops; 409 mp->mnt_flag = mntflag; 410 411 /* Initialize mount args. */ 412 bzero((caddr_t) &args, sizeof(args)); 413 args.addr = (struct sockaddr *)&ndmntp->ndm_saddr; 414 args.addrlen = args.addr->sa_len; 415 args.sotype = SOCK_DGRAM; 416 args.fh = ndmntp->ndm_fh; 417 args.fhsize = NFSX_V2FH; 418 args.hostname = ndmntp->ndm_host; 419 args.flags = NFSMNT_RESVPORT; 420 421 #ifdef NFS_BOOT_OPTIONS 422 args.flags |= NFS_BOOT_OPTIONS; 423 #endif 424 #ifdef NFS_BOOT_RWSIZE 425 /* 426 * Reduce rsize,wsize for interfaces that consistently 427 * drop fragments of long UDP messages. (i.e. wd8003). 428 * You can always change these later via remount. 429 */ 430 args.flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 431 args.wsize = NFS_BOOT_RWSIZE; 432 args.rsize = NFS_BOOT_RWSIZE; 433 #endif 434 435 /* Get mbuf for server sockaddr. */ 436 m = m_get(M_WAIT, MT_SONAME); 437 if (m == NULL) 438 panic("nfs_mountroot: mget soname for %s", mntname); 439 bcopy((caddr_t)args.addr, mtod(m, caddr_t), 440 (m->m_len = args.addr->sa_len)); 441 442 error = mountnfs(&args, mp, m, mntname, args.hostname, vpp); 443 if (error) 444 panic("nfs_mountroot: mount %s failed: %d", mntname); 445 446 return (mp); 447 } 448 449 void 450 nfs_decode_args(nmp, argp) 451 struct nfsmount *nmp; 452 struct nfs_args *argp; 453 { 454 int s; 455 int adjsock; 456 int maxio; 457 458 s = splsoftnet(); 459 460 /* Re-bind if rsrvd port requested and wasn't on one */ 461 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 462 && (argp->flags & NFSMNT_RESVPORT); 463 464 /* Update flags atomically. Don't change the lock bits. */ 465 nmp->nm_flag = 466 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 467 splx(s); 468 469 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 470 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 471 if (nmp->nm_timeo < NFS_MINTIMEO) 472 nmp->nm_timeo = NFS_MINTIMEO; 473 else if (nmp->nm_timeo > NFS_MAXTIMEO) 474 nmp->nm_timeo = NFS_MAXTIMEO; 475 } 476 477 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 478 nmp->nm_retry = argp->retrans; 479 if (nmp->nm_retry > NFS_MAXREXMIT) 480 nmp->nm_retry = NFS_MAXREXMIT; 481 } 482 483 if (argp->flags & NFSMNT_NFSV3) { 484 if (argp->sotype == SOCK_DGRAM) 485 maxio = NFS_MAXDGRAMDATA; 486 else 487 maxio = NFS_MAXDATA; 488 } else 489 maxio = NFS_V2MAXDATA; 490 491 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 492 int osize = nmp->nm_wsize; 493 nmp->nm_wsize = argp->wsize; 494 /* Round down to multiple of blocksize */ 495 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 496 if (nmp->nm_wsize <= 0) 497 nmp->nm_wsize = NFS_FABLKSIZE; 498 adjsock |= (nmp->nm_wsize != osize); 499 } 500 if (nmp->nm_wsize > maxio) 501 nmp->nm_wsize = maxio; 502 if (nmp->nm_wsize > MAXBSIZE) 503 nmp->nm_wsize = MAXBSIZE; 504 505 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 506 int osize = nmp->nm_rsize; 507 nmp->nm_rsize = argp->rsize; 508 /* Round down to multiple of blocksize */ 509 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 510 if (nmp->nm_rsize <= 0) 511 nmp->nm_rsize = NFS_FABLKSIZE; 512 adjsock |= (nmp->nm_rsize != osize); 513 } 514 if (nmp->nm_rsize > maxio) 515 nmp->nm_rsize = maxio; 516 if (nmp->nm_rsize > MAXBSIZE) 517 nmp->nm_rsize = MAXBSIZE; 518 519 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 520 nmp->nm_readdirsize = argp->readdirsize; 521 /* Round down to multiple of blocksize */ 522 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 523 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 524 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 525 } 526 if (nmp->nm_readdirsize > maxio) 527 nmp->nm_readdirsize = maxio; 528 529 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 530 argp->maxgrouplist <= NFS_MAXGRPS) 531 nmp->nm_numgrps = argp->maxgrouplist; 532 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 533 argp->readahead <= NFS_MAXRAHEAD) 534 nmp->nm_readahead = argp->readahead; 535 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 536 argp->leaseterm <= NQ_MAXLEASE) 537 nmp->nm_leaseterm = argp->leaseterm; 538 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 539 argp->deadthresh <= NQ_NEVERDEAD) 540 nmp->nm_deadthresh = argp->deadthresh; 541 542 if (nmp->nm_so && adjsock) { 543 nfs_disconnect(nmp); 544 if (nmp->nm_sotype == SOCK_DGRAM) 545 while (nfs_connect(nmp, (struct nfsreq *)0)) { 546 printf("nfs_args: retrying connect\n"); 547 (void) tsleep((caddr_t)&lbolt, 548 PSOCK, "nfscon", 0); 549 } 550 } 551 } 552 553 /* 554 * VFS Operations. 555 * 556 * mount system call 557 * It seems a bit dumb to copyinstr() the host and path here and then 558 * bcopy() them in mountnfs(), but I wanted to detect errors before 559 * doing the sockargs() call because sockargs() allocates an mbuf and 560 * an error after that means that I have to release the mbuf. 561 */ 562 /* ARGSUSED */ 563 int 564 nfs_mount(mp, path, data, ndp, p) 565 struct mount *mp; 566 char *path; 567 caddr_t data; 568 struct nameidata *ndp; 569 struct proc *p; 570 { 571 int error; 572 struct nfs_args args; 573 struct mbuf *nam; 574 struct vnode *vp; 575 char pth[MNAMELEN], hst[MNAMELEN]; 576 size_t len; 577 u_char nfh[NFSX_V3FHMAX]; 578 579 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 580 if (error) 581 return (error); 582 if (args.version != NFS_ARGSVERSION) 583 return (EPROGMISMATCH); 584 if (mp->mnt_flag & MNT_UPDATE) { 585 register struct nfsmount *nmp = VFSTONFS(mp); 586 587 if (nmp == NULL) 588 return (EIO); 589 nfs_decode_args(nmp, &args); 590 return (0); 591 } 592 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 593 if (error) 594 return (error); 595 error = copyinstr(path, pth, MNAMELEN-1, &len); 596 if (error) 597 return (error); 598 bzero(&pth[len], MNAMELEN - len); 599 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 600 if (error) 601 return (error); 602 bzero(&hst[len], MNAMELEN - len); 603 /* sockargs() call must be after above copyin() calls */ 604 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 605 if (error) 606 return (error); 607 args.fh = nfh; 608 error = mountnfs(&args, mp, nam, pth, hst, &vp); 609 return (error); 610 } 611 612 /* 613 * Common code for mount and mountroot 614 */ 615 int 616 mountnfs(argp, mp, nam, pth, hst, vpp) 617 register struct nfs_args *argp; 618 register struct mount *mp; 619 struct mbuf *nam; 620 char *pth, *hst; 621 struct vnode **vpp; 622 { 623 register struct nfsmount *nmp; 624 struct nfsnode *np; 625 int error; 626 627 if (mp->mnt_flag & MNT_UPDATE) { 628 nmp = VFSTONFS(mp); 629 /* update paths, file handles, etc, here XXX */ 630 m_freem(nam); 631 return (0); 632 } else { 633 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 634 M_NFSMNT, M_WAITOK); 635 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 636 mp->mnt_data = (qaddr_t)nmp; 637 TAILQ_INIT(&nmp->nm_uidlruhead); 638 } 639 #ifdef Lite2_integrated 640 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 641 #else 642 getnewfsid(mp, makefstype(MOUNT_NFS)); 643 #endif 644 nmp->nm_mountp = mp; 645 if (argp->flags & NFSMNT_NQNFS) 646 /* 647 * We have to set mnt_maxsymlink to a non-zero value so 648 * that COMPAT_43 routines will know that we are setting 649 * the d_type field in directories (and can zero it for 650 * unsuspecting binaries). 651 */ 652 mp->mnt_maxsymlinklen = 1; 653 nmp->nm_timeo = NFS_TIMEO; 654 nmp->nm_retry = NFS_RETRANS; 655 nmp->nm_wsize = NFS_WSIZE; 656 nmp->nm_rsize = NFS_RSIZE; 657 nmp->nm_readdirsize = NFS_READDIRSIZE; 658 nmp->nm_numgrps = NFS_MAXGRPS; 659 nmp->nm_readahead = NFS_DEFRAHEAD; 660 nmp->nm_leaseterm = NQ_DEFLEASE; 661 nmp->nm_deadthresh = NQ_DEADTHRESH; 662 CIRCLEQ_INIT(&nmp->nm_timerhead); 663 nmp->nm_inprog = NULLVP; 664 nmp->nm_fhsize = argp->fhsize; 665 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 666 #ifdef COMPAT_09 667 mp->mnt_stat.f_type = 2; 668 #else 669 mp->mnt_stat.f_type = 0; 670 #endif 671 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 672 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 673 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 674 nmp->nm_nam = nam; 675 nfs_decode_args(nmp, argp); 676 677 /* Set up the sockets and per-host congestion */ 678 nmp->nm_sotype = argp->sotype; 679 nmp->nm_soproto = argp->proto; 680 681 /* 682 * For Connection based sockets (TCP,...) defer the connect until 683 * the first request, in case the server is not responding. 684 */ 685 if (nmp->nm_sotype == SOCK_DGRAM && 686 (error = nfs_connect(nmp, (struct nfsreq *)0))) 687 goto bad; 688 689 /* 690 * This is silly, but it has to be set so that vinifod() works. 691 * We do not want to do an nfs_statfs() here since we can get 692 * stuck on a dead server and we are holding a lock on the mount 693 * point. 694 */ 695 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 696 /* 697 * A reference count is needed on the nfsnode representing the 698 * remote root. If this object is not persistent, then backward 699 * traversals of the mount point (i.e. "..") will not work if 700 * the nfsnode gets flushed out of the cache. Ufs does not have 701 * this problem, because one can identify root inodes by their 702 * number == ROOTINO (2). 703 */ 704 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 705 if (error) 706 goto bad; 707 *vpp = NFSTOV(np); 708 709 return (0); 710 bad: 711 nfs_disconnect(nmp); 712 free((caddr_t)nmp, M_NFSMNT); 713 m_freem(nam); 714 return (error); 715 } 716 717 /* 718 * unmount system call 719 */ 720 int 721 nfs_unmount(mp, mntflags, p) 722 struct mount *mp; 723 int mntflags; 724 struct proc *p; 725 { 726 register struct nfsmount *nmp; 727 struct nfsnode *np; 728 struct vnode *vp; 729 int error, flags = 0; 730 731 if (mntflags & MNT_FORCE) 732 flags |= FORCECLOSE; 733 nmp = VFSTONFS(mp); 734 /* 735 * Goes something like this.. 736 * - Check for activity on the root vnode (other than ourselves). 737 * - Call vflush() to clear out vnodes for this file system, 738 * except for the root vnode. 739 * - Decrement reference on the vnode representing remote root. 740 * - Close the socket 741 * - Free up the data structures 742 */ 743 /* 744 * We need to decrement the ref. count on the nfsnode representing 745 * the remote root. See comment in mountnfs(). The VFS unmount() 746 * has done vput on this vnode, otherwise we would get deadlock! 747 */ 748 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 749 if (error) 750 return(error); 751 vp = NFSTOV(np); 752 if (vp->v_usecount > 2) { 753 vput(vp); 754 return (EBUSY); 755 } 756 757 /* 758 * Must handshake with nqnfs_clientd() if it is active. 759 */ 760 nmp->nm_flag |= NFSMNT_DISMINPROG; 761 while (nmp->nm_inprog != NULLVP) 762 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 763 error = vflush(mp, vp, flags); 764 if (error) { 765 vput(vp); 766 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 767 return (error); 768 } 769 770 /* 771 * We are now committed to the unmount. 772 * For NQNFS, let the server daemon free the nfsmount structure. 773 */ 774 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 775 nmp->nm_flag |= NFSMNT_DISMNT; 776 777 /* 778 * There are two reference counts to get rid of here. 779 */ 780 vrele(vp); 781 vrele(vp); 782 vgone(vp); 783 nfs_disconnect(nmp); 784 m_freem(nmp->nm_nam); 785 786 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 787 free((caddr_t)nmp, M_NFSMNT); 788 return (0); 789 } 790 791 /* 792 * Return root of a filesystem 793 */ 794 int 795 nfs_root(mp, vpp) 796 struct mount *mp; 797 struct vnode **vpp; 798 { 799 register struct vnode *vp; 800 struct nfsmount *nmp; 801 struct nfsnode *np; 802 int error; 803 804 nmp = VFSTONFS(mp); 805 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 806 if (error) 807 return (error); 808 vp = NFSTOV(np); 809 vp->v_type = VDIR; 810 vp->v_flag = VROOT; 811 *vpp = vp; 812 return (0); 813 } 814 815 extern int syncprt; 816 817 /* 818 * Flush out the buffer cache 819 */ 820 /* ARGSUSED */ 821 int 822 nfs_sync(mp, waitfor, cred, p) 823 struct mount *mp; 824 int waitfor; 825 struct ucred *cred; 826 struct proc *p; 827 { 828 register struct vnode *vp; 829 int error, allerror = 0; 830 831 /* 832 * Force stale buffer cache information to be flushed. 833 */ 834 loop: 835 for (vp = mp->mnt_vnodelist.lh_first; 836 vp != NULL; 837 vp = vp->v_mntvnodes.le_next) { 838 /* 839 * If the vnode that we are about to sync is no longer 840 * associated with this mount point, start over. 841 */ 842 if (vp->v_mount != mp) 843 goto loop; 844 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 845 continue; 846 #ifdef Lite2_integrated 847 if (vget(vp, LK_EXCLUSIVE, p)) 848 #else 849 if (vget(vp, 1)) 850 #endif 851 goto loop; 852 error = VOP_FSYNC(vp, cred, waitfor, p); 853 if (error) 854 allerror = error; 855 vput(vp); 856 } 857 return (allerror); 858 } 859 860 /* 861 * NFS flat namespace lookup. 862 * Currently unsupported. 863 */ 864 /* ARGSUSED */ 865 int 866 nfs_vget(mp, ino, vpp) 867 struct mount *mp; 868 ino_t ino; 869 struct vnode **vpp; 870 { 871 872 return (EOPNOTSUPP); 873 } 874 875 #ifdef notyet 876 /* 877 * Do that sysctl thang... 878 */ 879 static int 880 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 881 size_t newlen, struct proc *p) 882 { 883 int rv; 884 885 /* 886 * All names at this level are terminal. 887 */ 888 if(namelen > 1) 889 return ENOTDIR; /* overloaded */ 890 891 switch(name[0]) { 892 case NFS_NFSSTATS: 893 if(!oldp) { 894 *oldlenp = sizeof nfsstats; 895 return 0; 896 } 897 898 if(*oldlenp < sizeof nfsstats) { 899 *oldlenp = sizeof nfsstats; 900 return ENOMEM; 901 } 902 903 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 904 if(rv) return rv; 905 906 if(newp && newlen != sizeof nfsstats) 907 return EINVAL; 908 909 if(newp) { 910 return copyin(newp, &nfsstats, sizeof nfsstats); 911 } 912 return 0; 913 914 default: 915 return EOPNOTSUPP; 916 } 917 } 918 #endif 919 920 921 /* 922 * At this point, this should never happen 923 */ 924 /* ARGSUSED */ 925 int 926 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 927 register struct mount *mp; 928 struct fid *fhp; 929 struct mbuf *nam; 930 struct vnode **vpp; 931 int *exflagsp; 932 struct ucred **credanonp; 933 { 934 935 return (EINVAL); 936 } 937 938 /* 939 * Vnode pointer to File handle, should never happen either 940 */ 941 /* ARGSUSED */ 942 int 943 nfs_vptofh(vp, fhp) 944 struct vnode *vp; 945 struct fid *fhp; 946 { 947 948 return (EINVAL); 949 } 950 951 /* 952 * Vfs start routine, a no-op. 953 */ 954 /* ARGSUSED */ 955 int 956 nfs_start(mp, flags, p) 957 struct mount *mp; 958 int flags; 959 struct proc *p; 960 { 961 962 return (0); 963 } 964 965 /* 966 * Do operations associated with quotas, not supported 967 */ 968 /* ARGSUSED */ 969 int 970 nfs_quotactl(mp, cmd, uid, arg, p) 971 struct mount *mp; 972 int cmd; 973 uid_t uid; 974 caddr_t arg; 975 struct proc *p; 976 { 977 978 return (EOPNOTSUPP); 979 } 980
Indexes created Fri Sep 26 20:09:58 GMT 2025