1 /* 2 * Copyright (c) 1989, 1993, 1995 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 * %sccs.include.redist.c% 9 * 10 * @(#)nfs_vfsops.c 8.8 (Berkeley) 05/09/95 11 */ 12 13 #include <sys/param.h> 14 #include <sys/conf.h> 15 #include <sys/ioctl.h> 16 #include <sys/signal.h> 17 #include <sys/proc.h> 18 #include <sys/namei.h> 19 #include <sys/vnode.h> 20 #include <sys/kernel.h> 21 #include <sys/mount.h> 22 #include <sys/buf.h> 23 #include <sys/mbuf.h> 24 #include <sys/socket.h> 25 #include <sys/socketvar.h> 26 #include <sys/systm.h> 27 28 #include <net/if.h> 29 #include <net/route.h> 30 #include <netinet/in.h> 31 32 #include <nfs/rpcv2.h> 33 #include <nfs/nfsproto.h> 34 #include <nfs/nfsnode.h> 35 #include <nfs/nfs.h> 36 #include <nfs/nfsmount.h> 37 #include <nfs/xdr_subs.h> 38 #include <nfs/nfsm_subs.h> 39 #include <nfs/nfsdiskless.h> 40 #include <nfs/nqnfs.h> 41 42 struct nfsstats nfsstats; 43 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 44 struct proc *); 45 extern int nfs_ticks; 46 47 /* 48 * nfs vfs operations. 49 */ 50 struct vfsops nfs_vfsops = { 51 nfs_mount, 52 nfs_start, 53 nfs_unmount, 54 nfs_root, 55 nfs_quotactl, 56 nfs_statfs, 57 nfs_sync, 58 nfs_vget, 59 nfs_fhtovp, 60 nfs_vptofh, 61 nfs_init, 62 nfs_sysctl 63 }; 64 65 /* 66 * This structure must be filled in by a primary bootstrap or bootstrap 67 * server for a diskless/dataless machine. It is initialized below just 68 * to ensure that it is allocated to initialized data (.data not .bss). 69 */ 70 struct nfs_diskless nfs_diskless = { 0 }; 71 int nfs_diskless_valid = 0; 72 73 void nfs_disconnect __P((struct nfsmount *)); 74 void nfsargs_ntoh __P((struct nfs_args *)); 75 int nfs_fsinfo __P((struct nfsmount *, struct vnode *, struct ucred *, 76 struct proc *)); 77 static struct mount *nfs_mountdiskless __P((char *, char *, int, 78 struct sockaddr_in *, struct nfs_args *, register struct vnode **)); 79 80 /* 81 * nfs statfs call 82 */ 83 int 84 nfs_statfs(mp, sbp, p) 85 struct mount *mp; 86 register struct statfs *sbp; 87 struct proc *p; 88 { 89 register struct vnode *vp; 90 register struct nfs_statfs *sfp; 91 register caddr_t cp; 92 register u_long *tl; 93 register long t1, t2; 94 caddr_t bpos, dpos, cp2; 95 struct nfsmount *nmp = VFSTONFS(mp); 96 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 97 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 98 struct ucred *cred; 99 struct nfsnode *np; 100 u_quad_t tquad; 101 102 #ifndef nolint 103 sfp = (struct nfs_statfs *)0; 104 #endif 105 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 106 if (error) 107 return (error); 108 vp = NFSTOV(np); 109 cred = crget(); 110 cred->cr_ngroups = 1; 111 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 112 (void)nfs_fsinfo(nmp, vp, cred, p); 113 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 114 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 115 nfsm_fhtom(vp, v3); 116 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 117 if (v3) 118 nfsm_postop_attr(vp, retattr); 119 if (!error) 120 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 121 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 122 if (v3) { 123 sbp->f_bsize = NFS_FABLKSIZE; 124 fxdr_hyper(&sfp->sf_tbytes, &tquad); 125 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 126 fxdr_hyper(&sfp->sf_fbytes, &tquad); 127 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 128 fxdr_hyper(&sfp->sf_abytes, &tquad); 129 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 130 sbp->f_files = (fxdr_unsigned(long, sfp->sf_tfiles.nfsuquad[1]) 131 & 0x7fffffff); 132 sbp->f_ffree = (fxdr_unsigned(long, sfp->sf_ffiles.nfsuquad[1]) 133 & 0x7fffffff); 134 } else { 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 sbp->f_files = 0; 140 sbp->f_ffree = 0; 141 } 142 if (sbp != &mp->mnt_stat) { 143 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 144 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 145 } 146 nfsm_reqdone; 147 vrele(vp); 148 crfree(cred); 149 return (error); 150 } 151 152 /* 153 * nfs version 3 fsinfo rpc call 154 */ 155 int 156 nfs_fsinfo(nmp, vp, cred, p) 157 register struct nfsmount *nmp; 158 register struct vnode *vp; 159 struct ucred *cred; 160 struct proc *p; 161 { 162 register struct nfsv3_fsinfo *fsp; 163 register caddr_t cp; 164 register long t1, t2; 165 register u_long *tl, pref, max; 166 caddr_t bpos, dpos, cp2; 167 int error = 0, retattr; 168 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 169 170 nfsstats.rpccnt[NFSPROC_FSINFO]++; 171 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 172 nfsm_fhtom(vp, 1); 173 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 174 nfsm_postop_attr(vp, retattr); 175 if (!error) { 176 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 177 pref = fxdr_unsigned(u_long, fsp->fs_wtpref); 178 if (pref < nmp->nm_wsize) 179 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 180 ~(NFS_FABLKSIZE - 1); 181 max = fxdr_unsigned(u_long, fsp->fs_wtmax); 182 if (max < nmp->nm_wsize) { 183 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 184 if (nmp->nm_wsize == 0) 185 nmp->nm_wsize = max; 186 } 187 pref = fxdr_unsigned(u_long, fsp->fs_rtpref); 188 if (pref < nmp->nm_rsize) 189 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 190 ~(NFS_FABLKSIZE - 1); 191 max = fxdr_unsigned(u_long, fsp->fs_rtmax); 192 if (max < nmp->nm_rsize) { 193 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 194 if (nmp->nm_rsize == 0) 195 nmp->nm_rsize = max; 196 } 197 pref = fxdr_unsigned(u_long, fsp->fs_dtpref); 198 if (pref < nmp->nm_readdirsize) 199 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 200 ~(NFS_DIRBLKSIZ - 1); 201 if (max < nmp->nm_readdirsize) { 202 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 203 if (nmp->nm_readdirsize == 0) 204 nmp->nm_readdirsize = max; 205 } 206 nmp->nm_flag |= NFSMNT_GOTFSINFO; 207 } 208 nfsm_reqdone; 209 return (error); 210 } 211 212 /* 213 * Mount a remote root fs via. nfs. This depends on the info in the 214 * nfs_diskless structure that has been filled in properly by some primary 215 * bootstrap. 216 * It goes something like this: 217 * - do enough of "ifconfig" by calling ifioctl() so that the system 218 * can talk to the server 219 * - If nfs_diskless.mygateway is filled in, use that address as 220 * a default gateway. 221 * - hand craft the swap nfs vnode hanging off a fake mount point 222 * if swdevt[0].sw_dev == NODEV 223 * - build the rootfs mount point and call mountnfs() to do the rest. 224 */ 225 int 226 nfs_mountroot() 227 { 228 register struct mount *mp; 229 register struct nfs_diskless *nd = &nfs_diskless; 230 struct socket *so; 231 struct vnode *vp; 232 struct proc *p = curproc; /* XXX */ 233 int error, i; 234 u_long l; 235 char buf[128]; 236 237 /* 238 * XXX time must be non-zero when we init the interface or else 239 * the arp code will wedge... 240 */ 241 if (time.tv_sec == 0) 242 time.tv_sec = 1; 243 244 /* 245 * XXX splnet, so networks will receive... 246 */ 247 splnet(); 248 249 #ifdef notyet 250 /* Set up swap credentials. */ 251 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 252 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 253 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 254 NGROUPS) 255 proc0.p_ucred->cr_ngroups = NGROUPS; 256 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 257 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 258 #endif 259 260 /* 261 * Do enough of ifconfig(8) so that the critical net interface can 262 * talk to the server. 263 */ 264 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0); 265 if (error) 266 panic("nfs_mountroot: socreate(%04x): %d", 267 nd->myif.ifra_addr.sa_family, error); 268 269 /* 270 * We might not have been told the right interface, so we pass 271 * over the first ten interfaces of the same kind, until we get 272 * one of them configured. 273 */ 274 275 for (i = strlen(nd->myif.ifra_name) - 1; 276 nd->myif.ifra_name[i] >= '0' && 277 nd->myif.ifra_name[i] <= '9'; 278 nd->myif.ifra_name[i] ++) { 279 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 280 if(!error) 281 break; 282 } 283 if (error) 284 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 285 soclose(so); 286 287 /* 288 * If the gateway field is filled in, set it as the default route. 289 */ 290 if (nd->mygateway.sin_len != 0) { 291 struct sockaddr_in mask, sin; 292 293 bzero((caddr_t)&mask, sizeof(mask)); 294 sin = mask; 295 sin.sin_family = AF_INET; 296 sin.sin_len = sizeof(sin); 297 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 298 (struct sockaddr *)&nd->mygateway, 299 (struct sockaddr *)&mask, 300 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 301 if (error) 302 panic("nfs_mountroot: RTM_ADD: %d", error); 303 } 304 305 if (nd->swap_nblks) { 306 /* 307 * Create a fake mount point just for the swap vnode so that the 308 * swap file can be on a different server from the rootfs. 309 */ 310 nd->swap_args.fh = nd->swap_fh; 311 /* 312 * If using nfsv3_diskless, replace NFSX_V2FH with 313 * nd->swap_fhsize. 314 */ 315 nd->swap_args.fhsize = NFSX_V2FH; 316 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 317 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 318 (l >> 24) & 0xff, (l >> 16) & 0xff, 319 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 320 printf("NFS SWAP: %s\n",buf); 321 (void) nfs_mountdiskless(buf, "/swap", 0, 322 &nd->swap_saddr, &nd->swap_args, &vp); 323 324 for (i=0;swdevt[i].sw_dev != NODEV;i++) ; 325 326 /* 327 * Since the swap file is not the root dir of a file system, 328 * hack it to a regular file. 329 */ 330 vp->v_type = VREG; 331 vp->v_flag = 0; 332 swapdev_vp = vp; 333 VREF(vp); 334 swdevt[i].sw_vp = vp; 335 swdevt[i].sw_nblks = nd->swap_nblks*2; 336 337 if (!swdevt[i].sw_nblks) { 338 swdevt[i].sw_nblks = 2048; 339 printf("defaulting to %d kbyte.\n", 340 swdevt[i].sw_nblks/2); 341 } else 342 printf("using %d kbyte.\n",swdevt[i].sw_nblks/2); 343 } 344 345 /* 346 * Create the rootfs mount point. 347 */ 348 nd->root_args.fh = nd->root_fh; 349 /* 350 * If using nfsv3_diskless, replace NFSX_V2FH with nd->root_fhsize. 351 */ 352 nd->root_args.fhsize = NFSX_V2FH; 353 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 354 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 355 (l >> 24) & 0xff, (l >> 16) & 0xff, 356 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 357 printf("NFS ROOT: %s\n",buf); 358 mp = nfs_mountdiskless(buf, "/", MNT_RDONLY, 359 &nd->root_saddr, &nd->root_args, &vp); 360 361 if (vfs_lock(mp)) 362 panic("nfs_mountroot: vfs_lock"); 363 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 364 mp->mnt_flag |= MNT_ROOTFS; 365 mp->mnt_vnodecovered = NULLVP; 366 vfs_unlock(mp); 367 rootvp = vp; 368 369 /* 370 * This is not really an nfs issue, but it is much easier to 371 * set hostname here and then let the "/etc/rc.xxx" files 372 * mount the right /var based upon its preset value. 373 */ 374 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 375 hostname[MAXHOSTNAMELEN - 1] = '\0'; 376 for (i = 0; i < MAXHOSTNAMELEN; i++) 377 if (hostname[i] == '\0') 378 break; 379 hostnamelen = i; 380 inittodr(ntohl(nd->root_time)); 381 return (0); 382 } 383 384 /* 385 * Internal version of mount system call for diskless setup. 386 */ 387 static struct mount * 388 nfs_mountdiskless(path, which, mountflag, sin, args, vpp) 389 char *path; 390 char *which; 391 int mountflag; 392 struct sockaddr_in *sin; 393 struct nfs_args *args; 394 register struct vnode **vpp; 395 { 396 register struct mount *mp; 397 register struct mbuf *m; 398 register int error; 399 struct vfsconf *vfsp; 400 401 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 402 if (!strcmp(vfsp->vfc_name, "nfs")) 403 break; 404 if (vfsp == NULL) 405 panic("nfs_mountroot: NFS not configured"); 406 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 407 bzero((char *)mp, (u_long)sizeof(struct mount)); 408 mp->mnt_vfc = vfsp; 409 mp->mnt_op = vfsp->vfc_vfsops; 410 mp->mnt_flag = mountflag; 411 MGET(m, MT_SONAME, M_DONTWAIT); 412 if (m == NULL) 413 panic("nfs_mountroot: %s mount mbuf", which); 414 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len); 415 m->m_len = sin->sin_len; 416 if (error = mountnfs(args, mp, m, which, path, vpp)) 417 panic("nfs_mountroot: mount %s on %s: %d", path, which, error); 418 vfsp->vfc_refcount++; 419 mp->mnt_stat.f_type = vfsp->vfc_typenum; 420 mp->mnt_flag |= (vfsp->vfc_flags & MNT_VISFLAGMASK) | MNT_ROOTFS; 421 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 422 423 return (mp); 424 } 425 426 427 /* 428 * VFS Operations. 429 * 430 * mount system call 431 * It seems a bit dumb to copyinstr() the host and path here and then 432 * bcopy() them in mountnfs(), but I wanted to detect errors before 433 * doing the sockargs() call because sockargs() allocates an mbuf and 434 * an error after that means that I have to release the mbuf. 435 */ 436 /* ARGSUSED */ 437 int 438 nfs_mount(mp, path, data, ndp, p) 439 struct mount *mp; 440 char *path; 441 caddr_t data; 442 struct nameidata *ndp; 443 struct proc *p; 444 { 445 int error; 446 struct nfs_args args; 447 struct mbuf *nam; 448 struct vnode *vp; 449 char pth[MNAMELEN], hst[MNAMELEN]; 450 u_int len; 451 u_char nfh[NFSX_V3FHMAX]; 452 453 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 454 if (error) 455 return (error); 456 if (args.version != NFS_ARGSVERSION) 457 return (EPROGMISMATCH); 458 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 459 if (error) 460 return (error); 461 error = copyinstr(path, pth, MNAMELEN-1, &len); 462 if (error) 463 return (error); 464 bzero(&pth[len], MNAMELEN - len); 465 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 466 if (error) 467 return (error); 468 bzero(&hst[len], MNAMELEN - len); 469 /* sockargs() call must be after above copyin() calls */ 470 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 471 if (error) 472 return (error); 473 args.fh = nfh; 474 error = mountnfs(&args, mp, nam, pth, hst, &vp); 475 return (error); 476 } 477 478 /* 479 * Common code for mount and mountroot 480 */ 481 int 482 mountnfs(argp, mp, nam, pth, hst, vpp) 483 register struct nfs_args *argp; 484 register struct mount *mp; 485 struct mbuf *nam; 486 char *pth, *hst; 487 struct vnode **vpp; 488 { 489 register struct nfsmount *nmp; 490 struct nfsnode *np; 491 int error, maxio; 492 493 if (mp->mnt_flag & MNT_UPDATE) { 494 nmp = VFSTONFS(mp); 495 /* update paths, file handles, etc, here XXX */ 496 m_freem(nam); 497 return (0); 498 } else { 499 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 500 M_NFSMNT, M_WAITOK); 501 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 502 TAILQ_INIT(&nmp->nm_uidlruhead); 503 mp->mnt_data = (qaddr_t)nmp; 504 } 505 vfs_getnewfsid(mp); 506 nmp->nm_mountp = mp; 507 nmp->nm_flag = argp->flags; 508 if (nmp->nm_flag & NFSMNT_NQNFS) 509 /* 510 * We have to set mnt_maxsymlink to a non-zero value so 511 * that COMPAT_43 routines will know that we are setting 512 * the d_type field in directories (and can zero it for 513 * unsuspecting binaries). 514 */ 515 mp->mnt_maxsymlinklen = 1; 516 nmp->nm_timeo = NFS_TIMEO; 517 nmp->nm_retry = NFS_RETRANS; 518 nmp->nm_wsize = NFS_WSIZE; 519 nmp->nm_rsize = NFS_RSIZE; 520 nmp->nm_readdirsize = NFS_READDIRSIZE; 521 nmp->nm_numgrps = NFS_MAXGRPS; 522 nmp->nm_readahead = NFS_DEFRAHEAD; 523 nmp->nm_leaseterm = NQ_DEFLEASE; 524 nmp->nm_deadthresh = NQ_DEADTHRESH; 525 CIRCLEQ_INIT(&nmp->nm_timerhead); 526 nmp->nm_inprog = NULLVP; 527 nmp->nm_fhsize = argp->fhsize; 528 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 529 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 530 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 531 nmp->nm_nam = nam; 532 533 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 534 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 535 if (nmp->nm_timeo < NFS_MINTIMEO) 536 nmp->nm_timeo = NFS_MINTIMEO; 537 else if (nmp->nm_timeo > NFS_MAXTIMEO) 538 nmp->nm_timeo = NFS_MAXTIMEO; 539 } 540 541 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 542 nmp->nm_retry = argp->retrans; 543 if (nmp->nm_retry > NFS_MAXREXMIT) 544 nmp->nm_retry = NFS_MAXREXMIT; 545 } 546 547 if (argp->flags & NFSMNT_NFSV3) { 548 if (argp->sotype == SOCK_DGRAM) 549 maxio = NFS_MAXDGRAMDATA; 550 else 551 maxio = NFS_MAXDATA; 552 } else 553 maxio = NFS_V2MAXDATA; 554 555 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 556 nmp->nm_wsize = argp->wsize; 557 /* Round down to multiple of blocksize */ 558 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 559 if (nmp->nm_wsize <= 0) 560 nmp->nm_wsize = NFS_FABLKSIZE; 561 } 562 if (nmp->nm_wsize > maxio) 563 nmp->nm_wsize = maxio; 564 if (nmp->nm_wsize > MAXBSIZE) 565 nmp->nm_wsize = MAXBSIZE; 566 567 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 568 nmp->nm_rsize = argp->rsize; 569 /* Round down to multiple of blocksize */ 570 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 571 if (nmp->nm_rsize <= 0) 572 nmp->nm_rsize = NFS_FABLKSIZE; 573 } 574 if (nmp->nm_rsize > maxio) 575 nmp->nm_rsize = maxio; 576 if (nmp->nm_rsize > MAXBSIZE) 577 nmp->nm_rsize = MAXBSIZE; 578 579 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 580 nmp->nm_readdirsize = argp->readdirsize; 581 /* Round down to multiple of blocksize */ 582 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 583 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 584 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 585 } 586 if (nmp->nm_readdirsize > maxio) 587 nmp->nm_readdirsize = maxio; 588 589 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 590 argp->maxgrouplist <= NFS_MAXGRPS) 591 nmp->nm_numgrps = argp->maxgrouplist; 592 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 593 argp->readahead <= NFS_MAXRAHEAD) 594 nmp->nm_readahead = argp->readahead; 595 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 596 argp->leaseterm <= NQ_MAXLEASE) 597 nmp->nm_leaseterm = argp->leaseterm; 598 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 599 argp->deadthresh <= NQ_NEVERDEAD) 600 nmp->nm_deadthresh = argp->deadthresh; 601 /* Set up the sockets and per-host congestion */ 602 nmp->nm_sotype = argp->sotype; 603 nmp->nm_soproto = argp->proto; 604 605 /* 606 * For Connection based sockets (TCP,...) defer the connect until 607 * the first request, in case the server is not responding. 608 */ 609 if (nmp->nm_sotype == SOCK_DGRAM && 610 (error = nfs_connect(nmp, (struct nfsreq *)0))) 611 goto bad; 612 613 /* 614 * This is silly, but it has to be set so that vinifod() works. 615 * We do not want to do an nfs_statfs() here since we can get 616 * stuck on a dead server and we are holding a lock on the mount 617 * point. 618 */ 619 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 620 /* 621 * A reference count is needed on the nfsnode representing the 622 * remote root. If this object is not persistent, then backward 623 * traversals of the mount point (i.e. "..") will not work if 624 * the nfsnode gets flushed out of the cache. Ufs does not have 625 * this problem, because one can identify root inodes by their 626 * number == ROOTINO (2). 627 */ 628 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 629 if (error) 630 goto bad; 631 *vpp = NFSTOV(np); 632 633 return (0); 634 bad: 635 nfs_disconnect(nmp); 636 free((caddr_t)nmp, M_NFSMNT); 637 m_freem(nam); 638 return (error); 639 } 640 641 /* 642 * unmount system call 643 */ 644 int 645 nfs_unmount(mp, mntflags, p) 646 struct mount *mp; 647 int mntflags; 648 struct proc *p; 649 { 650 register struct nfsmount *nmp; 651 struct nfsnode *np; 652 struct vnode *vp; 653 int error, flags = 0; 654 extern int doforce; 655 656 if (mntflags & MNT_FORCE) { 657 if (!doforce) 658 return (EINVAL); 659 flags |= FORCECLOSE; 660 } 661 nmp = VFSTONFS(mp); 662 /* 663 * Goes something like this.. 664 * - Check for activity on the root vnode (other than ourselves). 665 * - Call vflush() to clear out vnodes for this file system, 666 * except for the root vnode. 667 * - Decrement reference on the vnode representing remote root. 668 * - Close the socket 669 * - Free up the data structures 670 */ 671 /* 672 * We need to decrement the ref. count on the nfsnode representing 673 * the remote root. See comment in mountnfs(). The VFS unmount() 674 * has done vput on this vnode, otherwise we would get deadlock! 675 */ 676 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 677 if (error) 678 return(error); 679 vp = NFSTOV(np); 680 if (vp->v_usecount > 2) { 681 vput(vp); 682 return (EBUSY); 683 } 684 685 /* 686 * Must handshake with nqnfs_clientd() if it is active. 687 */ 688 nmp->nm_flag |= NFSMNT_DISMINPROG; 689 while (nmp->nm_inprog != NULLVP) 690 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 691 error = vflush(mp, vp, flags); 692 if (error) { 693 vput(vp); 694 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 695 return (error); 696 } 697 698 /* 699 * We are now committed to the unmount. 700 * For NQNFS, let the server daemon free the nfsmount structure. 701 */ 702 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 703 nmp->nm_flag |= NFSMNT_DISMNT; 704 705 /* 706 * There are two reference counts to get rid of here. 707 */ 708 vrele(vp); 709 vrele(vp); 710 vgone(vp); 711 nfs_disconnect(nmp); 712 m_freem(nmp->nm_nam); 713 714 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 715 free((caddr_t)nmp, M_NFSMNT); 716 return (0); 717 } 718 719 /* 720 * Return root of a filesystem 721 */ 722 int 723 nfs_root(mp, vpp) 724 struct mount *mp; 725 struct vnode **vpp; 726 { 727 register struct vnode *vp; 728 struct nfsmount *nmp; 729 struct nfsnode *np; 730 int error; 731 732 nmp = VFSTONFS(mp); 733 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 734 if (error) 735 return (error); 736 vp = NFSTOV(np); 737 vp->v_type = VDIR; 738 vp->v_flag = VROOT; 739 *vpp = vp; 740 return (0); 741 } 742 743 extern int syncprt; 744 745 /* 746 * Flush out the buffer cache 747 */ 748 /* ARGSUSED */ 749 int 750 nfs_sync(mp, waitfor, cred, p) 751 struct mount *mp; 752 int waitfor; 753 struct ucred *cred; 754 struct proc *p; 755 { 756 register struct vnode *vp; 757 int error, allerror = 0; 758 759 /* 760 * Force stale buffer cache information to be flushed. 761 */ 762 loop: 763 for (vp = mp->mnt_vnodelist.lh_first; 764 vp != NULL; 765 vp = vp->v_mntvnodes.le_next) { 766 /* 767 * If the vnode that we are about to sync is no longer 768 * associated with this mount point, start over. 769 */ 770 if (vp->v_mount != mp) 771 goto loop; 772 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 773 continue; 774 if (vget(vp, 1)) 775 goto loop; 776 error = VOP_FSYNC(vp, cred, waitfor, p); 777 if (error) 778 allerror = error; 779 vput(vp); 780 } 781 return (allerror); 782 } 783 784 /* 785 * NFS flat namespace lookup. 786 * Currently unsupported. 787 */ 788 /* ARGSUSED */ 789 int 790 nfs_vget(mp, ino, vpp) 791 struct mount *mp; 792 ino_t ino; 793 struct vnode **vpp; 794 { 795 796 return (EOPNOTSUPP); 797 } 798 799 /* 800 * At this point, this should never happen 801 */ 802 /* ARGSUSED */ 803 int 804 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 805 register struct mount *mp; 806 struct fid *fhp; 807 struct mbuf *nam; 808 struct vnode **vpp; 809 int *exflagsp; 810 struct ucred **credanonp; 811 { 812 813 return (EINVAL); 814 } 815 816 /* 817 * Vnode pointer to File handle, should never happen either 818 */ 819 /* ARGSUSED */ 820 int 821 nfs_vptofh(vp, fhp) 822 struct vnode *vp; 823 struct fid *fhp; 824 { 825 826 return (EINVAL); 827 } 828 829 /* 830 * Vfs start routine, a no-op. 831 */ 832 /* ARGSUSED */ 833 int 834 nfs_start(mp, flags, p) 835 struct mount *mp; 836 int flags; 837 struct proc *p; 838 { 839 840 return (0); 841 } 842 843 /* 844 * Do operations associated with quotas, not supported 845 */ 846 /* ARGSUSED */ 847 int 848 nfs_quotactl(mp, cmd, uid, arg, p) 849 struct mount *mp; 850 int cmd; 851 uid_t uid; 852 caddr_t arg; 853 struct proc *p; 854 { 855 856 return (EOPNOTSUPP); 857 } 858 859 /* 860 * Do that sysctl thang... 861 */ 862 static int 863 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 864 size_t newlen, struct proc *p) 865 { 866 int rv; 867 868 /* 869 * All names at this level are terminal. 870 */ 871 if(namelen > 1) 872 return ENOTDIR; /* overloaded */ 873 874 switch(name[0]) { 875 case NFS_NFSSTATS: 876 if(!oldp) { 877 *oldlenp = sizeof nfsstats; 878 return 0; 879 } 880 881 if(*oldlenp < sizeof nfsstats) { 882 *oldlenp = sizeof nfsstats; 883 return ENOMEM; 884 } 885 886 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 887 if(rv) return rv; 888 889 if(newp && newlen != sizeof nfsstats) 890 return EINVAL; 891 892 if(newp) { 893 return copyin(newp, &nfsstats, sizeof nfsstats); 894 } 895 return 0; 896 897 default: 898 return EOPNOTSUPP; 899 } 900 } 901 902