nfs_vfsops.c revision 1.1.1.3
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 * 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 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 37 */ 38 39 #include <sys/param.h> 40 #include <sys/conf.h> 41 #include <sys/ioctl.h> 42 #include <sys/signal.h> 43 #include <sys/proc.h> 44 #include <sys/namei.h> 45 #include <sys/vnode.h> 46 #include <sys/kernel.h> 47 #include <sys/mount.h> 48 #include <sys/buf.h> 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.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/nfsproto.h> 60 #include <nfs/nfsnode.h> 61 #include <nfs/nfs.h> 62 #include <nfs/nfsmount.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 struct nfsstats nfsstats; 69 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 70 struct proc *); 71 extern int nfs_ticks; 72 73 /* 74 * nfs vfs operations. 75 */ 76 struct vfsops nfs_vfsops = { 77 nfs_mount, 78 nfs_start, 79 nfs_unmount, 80 nfs_root, 81 nfs_quotactl, 82 nfs_statfs, 83 nfs_sync, 84 nfs_vget, 85 nfs_fhtovp, 86 nfs_vptofh, 87 nfs_init, 88 nfs_sysctl 89 }; 90 91 /* 92 * This structure must be filled in by a primary bootstrap or bootstrap 93 * server for a diskless/dataless machine. It is initialized below just 94 * to ensure that it is allocated to initialized data (.data not .bss). 95 */ 96 struct nfs_diskless nfs_diskless = { 0 }; 97 int nfs_diskless_valid = 0; 98 99 void nfs_disconnect __P((struct nfsmount *)); 100 void nfsargs_ntoh __P((struct nfs_args *)); 101 int nfs_fsinfo __P((struct nfsmount *, struct vnode *, struct ucred *, 102 struct proc *)); 103 static int nfs_mountdiskless __P((char *, char *, int, struct sockaddr_in *, 104 struct nfs_args *, struct proc *, struct vnode **, struct mount **)); 105 106 /* 107 * nfs statfs call 108 */ 109 int 110 nfs_statfs(mp, sbp, p) 111 struct mount *mp; 112 register struct statfs *sbp; 113 struct proc *p; 114 { 115 register struct vnode *vp; 116 register struct nfs_statfs *sfp; 117 register caddr_t cp; 118 register u_long *tl; 119 register long t1, t2; 120 caddr_t bpos, dpos, cp2; 121 struct nfsmount *nmp = VFSTONFS(mp); 122 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 123 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 124 struct ucred *cred; 125 struct nfsnode *np; 126 u_quad_t tquad; 127 128 #ifndef nolint 129 sfp = (struct nfs_statfs *)0; 130 #endif 131 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 132 if (error) 133 return (error); 134 vp = NFSTOV(np); 135 cred = crget(); 136 cred->cr_ngroups = 1; 137 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 138 (void)nfs_fsinfo(nmp, vp, cred, p); 139 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 140 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 141 nfsm_fhtom(vp, v3); 142 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 143 if (v3) 144 nfsm_postop_attr(vp, retattr); 145 if (!error) 146 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 147 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 148 if (v3) { 149 sbp->f_bsize = NFS_FABLKSIZE; 150 fxdr_hyper(&sfp->sf_tbytes, &tquad); 151 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 152 fxdr_hyper(&sfp->sf_fbytes, &tquad); 153 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 154 fxdr_hyper(&sfp->sf_abytes, &tquad); 155 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 156 sbp->f_files = (fxdr_unsigned(long, sfp->sf_tfiles.nfsuquad[1]) 157 & 0x7fffffff); 158 sbp->f_ffree = (fxdr_unsigned(long, sfp->sf_ffiles.nfsuquad[1]) 159 & 0x7fffffff); 160 } else { 161 sbp->f_bsize = fxdr_unsigned(long, sfp->sf_bsize); 162 sbp->f_blocks = fxdr_unsigned(long, sfp->sf_blocks); 163 sbp->f_bfree = fxdr_unsigned(long, sfp->sf_bfree); 164 sbp->f_bavail = fxdr_unsigned(long, sfp->sf_bavail); 165 sbp->f_files = 0; 166 sbp->f_ffree = 0; 167 } 168 if (sbp != &mp->mnt_stat) { 169 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 170 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 171 } 172 nfsm_reqdone; 173 vrele(vp); 174 crfree(cred); 175 return (error); 176 } 177 178 /* 179 * nfs version 3 fsinfo rpc call 180 */ 181 int 182 nfs_fsinfo(nmp, vp, cred, p) 183 register struct nfsmount *nmp; 184 register struct vnode *vp; 185 struct ucred *cred; 186 struct proc *p; 187 { 188 register struct nfsv3_fsinfo *fsp; 189 register caddr_t cp; 190 register long t1, t2; 191 register u_long *tl, pref, max; 192 caddr_t bpos, dpos, cp2; 193 int error = 0, retattr; 194 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 195 196 nfsstats.rpccnt[NFSPROC_FSINFO]++; 197 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 198 nfsm_fhtom(vp, 1); 199 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 200 nfsm_postop_attr(vp, retattr); 201 if (!error) { 202 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 203 pref = fxdr_unsigned(u_long, fsp->fs_wtpref); 204 if (pref < nmp->nm_wsize) 205 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 206 ~(NFS_FABLKSIZE - 1); 207 max = fxdr_unsigned(u_long, fsp->fs_wtmax); 208 if (max < nmp->nm_wsize) { 209 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 210 if (nmp->nm_wsize == 0) 211 nmp->nm_wsize = max; 212 } 213 pref = fxdr_unsigned(u_long, fsp->fs_rtpref); 214 if (pref < nmp->nm_rsize) 215 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 216 ~(NFS_FABLKSIZE - 1); 217 max = fxdr_unsigned(u_long, fsp->fs_rtmax); 218 if (max < nmp->nm_rsize) { 219 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 220 if (nmp->nm_rsize == 0) 221 nmp->nm_rsize = max; 222 } 223 pref = fxdr_unsigned(u_long, fsp->fs_dtpref); 224 if (pref < nmp->nm_readdirsize) 225 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 226 ~(NFS_DIRBLKSIZ - 1); 227 if (max < nmp->nm_readdirsize) { 228 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 229 if (nmp->nm_readdirsize == 0) 230 nmp->nm_readdirsize = max; 231 } 232 nmp->nm_flag |= NFSMNT_GOTFSINFO; 233 } 234 nfsm_reqdone; 235 return (error); 236 } 237 238 /* 239 * Mount a remote root fs via. nfs. This depends on the info in the 240 * nfs_diskless structure that has been filled in properly by some primary 241 * bootstrap. 242 * It goes something like this: 243 * - do enough of "ifconfig" by calling ifioctl() so that the system 244 * can talk to the server 245 * - If nfs_diskless.mygateway is filled in, use that address as 246 * a default gateway. 247 * - hand craft the swap nfs vnode hanging off a fake mount point 248 * if swdevt[0].sw_dev == NODEV 249 * - build the rootfs mount point and call mountnfs() to do the rest. 250 */ 251 int 252 nfs_mountroot() 253 { 254 struct mount *mp, *swap_mp; 255 struct nfs_diskless *nd = &nfs_diskless; 256 struct socket *so; 257 struct vnode *vp; 258 struct proc *p = curproc; /* XXX */ 259 int error, i; 260 u_long l; 261 char buf[128]; 262 263 /* 264 * XXX time must be non-zero when we init the interface or else 265 * the arp code will wedge... 266 */ 267 if (time.tv_sec == 0) 268 time.tv_sec = 1; 269 270 /* 271 * XXX splnet, so networks will receive... 272 */ 273 splnet(); 274 275 #ifdef notyet 276 /* Set up swap credentials. */ 277 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 278 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 279 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 280 NGROUPS) 281 proc0.p_ucred->cr_ngroups = NGROUPS; 282 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 283 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 284 #endif 285 286 /* 287 * Do enough of ifconfig(8) so that the critical net interface can 288 * talk to the server. 289 */ 290 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0); 291 if (error) { 292 printf("nfs_mountroot: socreate(%04x): %d", 293 nd->myif.ifra_addr.sa_family, error); 294 return (error); 295 } 296 297 /* 298 * We might not have been told the right interface, so we pass 299 * over the first ten interfaces of the same kind, until we get 300 * one of them configured. 301 */ 302 303 for (i = strlen(nd->myif.ifra_name) - 1; 304 nd->myif.ifra_name[i] >= '0' && 305 nd->myif.ifra_name[i] <= '9'; 306 nd->myif.ifra_name[i] ++) { 307 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 308 if(!error) 309 break; 310 } 311 if (error) { 312 printf("nfs_mountroot: SIOCAIFADDR: %d", error); 313 return (error); 314 } 315 soclose(so); 316 317 /* 318 * If the gateway field is filled in, set it as the default route. 319 */ 320 if (nd->mygateway.sin_len != 0) { 321 struct sockaddr_in mask, sin; 322 323 bzero((caddr_t)&mask, sizeof(mask)); 324 sin = mask; 325 sin.sin_family = AF_INET; 326 sin.sin_len = sizeof(sin); 327 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 328 (struct sockaddr *)&nd->mygateway, 329 (struct sockaddr *)&mask, 330 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 331 if (error) { 332 printf("nfs_mountroot: RTM_ADD: %d", error); 333 return (error); 334 } 335 } 336 337 swap_mp = NULL; 338 if (nd->swap_nblks) { 339 /* 340 * Create a fake mount point just for the swap vnode so that the 341 * swap file can be on a different server from the rootfs. 342 */ 343 nd->swap_args.fh = nd->swap_fh; 344 /* 345 * If using nfsv3_diskless, replace NFSX_V2FH with 346 * nd->swap_fhsize. 347 */ 348 nd->swap_args.fhsize = NFSX_V2FH; 349 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 350 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 351 (l >> 24) & 0xff, (l >> 16) & 0xff, 352 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 353 printf("NFS SWAP: %s\n",buf); 354 if (error = nfs_mountdiskless(buf, "/swap", 0, 355 &nd->swap_saddr, &nd->swap_args, p, &vp, &swap_mp)) 356 return (error); 357 vfs_unbusy(swap_mp, p); 358 359 for (i=0;swdevt[i].sw_dev != NODEV;i++) ; 360 361 /* 362 * Since the swap file is not the root dir of a file system, 363 * hack it to a regular file. 364 */ 365 vp->v_type = VREG; 366 vp->v_flag = 0; 367 swapdev_vp = vp; 368 VREF(vp); 369 swdevt[i].sw_vp = vp; 370 swdevt[i].sw_nblks = nd->swap_nblks*2; 371 372 if (!swdevt[i].sw_nblks) { 373 swdevt[i].sw_nblks = 2048; 374 printf("defaulting to %d kbyte.\n", 375 swdevt[i].sw_nblks/2); 376 } else 377 printf("using %d kbyte.\n",swdevt[i].sw_nblks/2); 378 } 379 380 /* 381 * Create the rootfs mount point. 382 */ 383 nd->root_args.fh = nd->root_fh; 384 /* 385 * If using nfsv3_diskless, replace NFSX_V2FH with nd->root_fhsize. 386 */ 387 nd->root_args.fhsize = NFSX_V2FH; 388 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 389 sprintf(buf,"%ld.%ld.%ld.%ld:%s", 390 (l >> 24) & 0xff, (l >> 16) & 0xff, 391 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 392 printf("NFS ROOT: %s\n",buf); 393 if (error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 394 &nd->root_saddr, &nd->root_args, p, &vp, &mp)) { 395 if (swap_mp) { 396 mp->mnt_vfc->vfc_refcount--; 397 free(swap_mp, M_MOUNT); 398 } 399 return (error); 400 } 401 402 simple_lock(&mountlist_slock); 403 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 404 simple_unlock(&mountlist_slock); 405 rootvp = vp; 406 vfs_unbusy(mp, p); 407 408 /* 409 * This is not really an nfs issue, but it is much easier to 410 * set hostname here and then let the "/etc/rc.xxx" files 411 * mount the right /var based upon its preset value. 412 */ 413 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 414 hostname[MAXHOSTNAMELEN - 1] = '\0'; 415 for (i = 0; i < MAXHOSTNAMELEN; i++) 416 if (hostname[i] == '\0') 417 break; 418 hostnamelen = i; 419 inittodr(ntohl(nd->root_time)); 420 return (0); 421 } 422 423 /* 424 * Internal version of mount system call for diskless setup. 425 */ 426 static int 427 nfs_mountdiskless(path, which, mountflag, sin, args, p, vpp, mpp) 428 char *path; 429 char *which; 430 int mountflag; 431 struct sockaddr_in *sin; 432 struct nfs_args *args; 433 struct proc *p; 434 struct vnode **vpp; 435 struct mount **mpp; 436 { 437 struct mount *mp; 438 struct mbuf *m; 439 int error; 440 441 if (error = vfs_rootmountalloc("nfs", path, &mp)) { 442 printf("nfs_mountroot: NFS not configured"); 443 return (error); 444 } 445 mp->mnt_flag = mountflag; 446 MGET(m, MT_SONAME, M_WAITOK); 447 bcopy((caddr_t)sin, mtod(m, caddr_t), sin->sin_len); 448 m->m_len = sin->sin_len; 449 if (error = mountnfs(args, mp, m, which, path, vpp)) { 450 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 451 mp->mnt_vfc->vfc_refcount--; 452 vfs_unbusy(mp, p); 453 free(mp, M_MOUNT); 454 return (error); 455 } 456 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0); 457 *mpp = mp; 458 return (0); 459 } 460 461 /* 462 * VFS Operations. 463 * 464 * mount system call 465 * It seems a bit dumb to copyinstr() the host and path here and then 466 * bcopy() them in mountnfs(), but I wanted to detect errors before 467 * doing the sockargs() call because sockargs() allocates an mbuf and 468 * an error after that means that I have to release the mbuf. 469 */ 470 /* ARGSUSED */ 471 int 472 nfs_mount(mp, path, data, ndp, p) 473 struct mount *mp; 474 char *path; 475 caddr_t data; 476 struct nameidata *ndp; 477 struct proc *p; 478 { 479 int error; 480 struct nfs_args args; 481 struct mbuf *nam; 482 struct vnode *vp; 483 char pth[MNAMELEN], hst[MNAMELEN]; 484 u_int len; 485 u_char nfh[NFSX_V3FHMAX]; 486 487 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 488 if (error) 489 return (error); 490 if (args.version != NFS_ARGSVERSION) 491 return (EPROGMISMATCH); 492 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 493 if (error) 494 return (error); 495 error = copyinstr(path, pth, MNAMELEN-1, &len); 496 if (error) 497 return (error); 498 bzero(&pth[len], MNAMELEN - len); 499 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 500 if (error) 501 return (error); 502 bzero(&hst[len], MNAMELEN - len); 503 /* sockargs() call must be after above copyin() calls */ 504 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 505 if (error) 506 return (error); 507 args.fh = nfh; 508 error = mountnfs(&args, mp, nam, pth, hst, &vp); 509 return (error); 510 } 511 512 /* 513 * Common code for mount and mountroot 514 */ 515 int 516 mountnfs(argp, mp, nam, pth, hst, vpp) 517 register struct nfs_args *argp; 518 register struct mount *mp; 519 struct mbuf *nam; 520 char *pth, *hst; 521 struct vnode **vpp; 522 { 523 register struct nfsmount *nmp; 524 struct nfsnode *np; 525 int error, maxio; 526 527 if (mp->mnt_flag & MNT_UPDATE) { 528 nmp = VFSTONFS(mp); 529 /* update paths, file handles, etc, here XXX */ 530 m_freem(nam); 531 return (0); 532 } else { 533 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 534 M_NFSMNT, M_WAITOK); 535 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 536 TAILQ_INIT(&nmp->nm_uidlruhead); 537 mp->mnt_data = (qaddr_t)nmp; 538 } 539 vfs_getnewfsid(mp); 540 nmp->nm_mountp = mp; 541 nmp->nm_flag = argp->flags; 542 if (nmp->nm_flag & NFSMNT_NQNFS) 543 /* 544 * We have to set mnt_maxsymlink to a non-zero value so 545 * that COMPAT_43 routines will know that we are setting 546 * the d_type field in directories (and can zero it for 547 * unsuspecting binaries). 548 */ 549 mp->mnt_maxsymlinklen = 1; 550 nmp->nm_timeo = NFS_TIMEO; 551 nmp->nm_retry = NFS_RETRANS; 552 nmp->nm_wsize = NFS_WSIZE; 553 nmp->nm_rsize = NFS_RSIZE; 554 nmp->nm_readdirsize = NFS_READDIRSIZE; 555 nmp->nm_numgrps = NFS_MAXGRPS; 556 nmp->nm_readahead = NFS_DEFRAHEAD; 557 nmp->nm_leaseterm = NQ_DEFLEASE; 558 nmp->nm_deadthresh = NQ_DEADTHRESH; 559 CIRCLEQ_INIT(&nmp->nm_timerhead); 560 nmp->nm_inprog = NULLVP; 561 nmp->nm_fhsize = argp->fhsize; 562 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 563 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 564 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 565 nmp->nm_nam = nam; 566 567 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 568 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 569 if (nmp->nm_timeo < NFS_MINTIMEO) 570 nmp->nm_timeo = NFS_MINTIMEO; 571 else if (nmp->nm_timeo > NFS_MAXTIMEO) 572 nmp->nm_timeo = NFS_MAXTIMEO; 573 } 574 575 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 576 nmp->nm_retry = argp->retrans; 577 if (nmp->nm_retry > NFS_MAXREXMIT) 578 nmp->nm_retry = NFS_MAXREXMIT; 579 } 580 581 if (argp->flags & NFSMNT_NFSV3) { 582 if (argp->sotype == SOCK_DGRAM) 583 maxio = NFS_MAXDGRAMDATA; 584 else 585 maxio = NFS_MAXDATA; 586 } else 587 maxio = NFS_V2MAXDATA; 588 589 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 590 nmp->nm_wsize = argp->wsize; 591 /* Round down to multiple of blocksize */ 592 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 593 if (nmp->nm_wsize <= 0) 594 nmp->nm_wsize = NFS_FABLKSIZE; 595 } 596 if (nmp->nm_wsize > maxio) 597 nmp->nm_wsize = maxio; 598 if (nmp->nm_wsize > MAXBSIZE) 599 nmp->nm_wsize = MAXBSIZE; 600 601 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 602 nmp->nm_rsize = argp->rsize; 603 /* Round down to multiple of blocksize */ 604 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 605 if (nmp->nm_rsize <= 0) 606 nmp->nm_rsize = NFS_FABLKSIZE; 607 } 608 if (nmp->nm_rsize > maxio) 609 nmp->nm_rsize = maxio; 610 if (nmp->nm_rsize > MAXBSIZE) 611 nmp->nm_rsize = MAXBSIZE; 612 613 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 614 nmp->nm_readdirsize = argp->readdirsize; 615 /* Round down to multiple of blocksize */ 616 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 617 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 618 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 619 } 620 if (nmp->nm_readdirsize > maxio) 621 nmp->nm_readdirsize = maxio; 622 623 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 624 argp->maxgrouplist <= NFS_MAXGRPS) 625 nmp->nm_numgrps = argp->maxgrouplist; 626 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 627 argp->readahead <= NFS_MAXRAHEAD) 628 nmp->nm_readahead = argp->readahead; 629 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 630 argp->leaseterm <= NQ_MAXLEASE) 631 nmp->nm_leaseterm = argp->leaseterm; 632 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 633 argp->deadthresh <= NQ_NEVERDEAD) 634 nmp->nm_deadthresh = argp->deadthresh; 635 /* Set up the sockets and per-host congestion */ 636 nmp->nm_sotype = argp->sotype; 637 nmp->nm_soproto = argp->proto; 638 639 /* 640 * For Connection based sockets (TCP,...) defer the connect until 641 * the first request, in case the server is not responding. 642 */ 643 if (nmp->nm_sotype == SOCK_DGRAM && 644 (error = nfs_connect(nmp, (struct nfsreq *)0))) 645 goto bad; 646 647 /* 648 * This is silly, but it has to be set so that vinifod() works. 649 * We do not want to do an nfs_statfs() here since we can get 650 * stuck on a dead server and we are holding a lock on the mount 651 * point. 652 */ 653 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 654 /* 655 * A reference count is needed on the nfsnode representing the 656 * remote root. If this object is not persistent, then backward 657 * traversals of the mount point (i.e. "..") will not work if 658 * the nfsnode gets flushed out of the cache. Ufs does not have 659 * this problem, because one can identify root inodes by their 660 * number == ROOTINO (2). 661 */ 662 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 663 if (error) 664 goto bad; 665 *vpp = NFSTOV(np); 666 667 return (0); 668 bad: 669 nfs_disconnect(nmp); 670 free((caddr_t)nmp, M_NFSMNT); 671 m_freem(nam); 672 return (error); 673 } 674 675 /* 676 * unmount system call 677 */ 678 int 679 nfs_unmount(mp, mntflags, p) 680 struct mount *mp; 681 int mntflags; 682 struct proc *p; 683 { 684 register struct nfsmount *nmp; 685 struct nfsnode *np; 686 struct vnode *vp; 687 int error, flags = 0; 688 689 if (mntflags & MNT_FORCE) 690 flags |= FORCECLOSE; 691 nmp = VFSTONFS(mp); 692 /* 693 * Goes something like this.. 694 * - Check for activity on the root vnode (other than ourselves). 695 * - Call vflush() to clear out vnodes for this file system, 696 * except for the root vnode. 697 * - Decrement reference on the vnode representing remote root. 698 * - Close the socket 699 * - Free up the data structures 700 */ 701 /* 702 * We need to decrement the ref. count on the nfsnode representing 703 * the remote root. See comment in mountnfs(). The VFS unmount() 704 * has done vput on this vnode, otherwise we would get deadlock! 705 */ 706 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 707 if (error) 708 return(error); 709 vp = NFSTOV(np); 710 if (vp->v_usecount > 2) { 711 vput(vp); 712 return (EBUSY); 713 } 714 715 /* 716 * Must handshake with nqnfs_clientd() if it is active. 717 */ 718 nmp->nm_flag |= NFSMNT_DISMINPROG; 719 while (nmp->nm_inprog != NULLVP) 720 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 721 error = vflush(mp, vp, flags); 722 if (error) { 723 vput(vp); 724 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 725 return (error); 726 } 727 728 /* 729 * We are now committed to the unmount. 730 * For NQNFS, let the server daemon free the nfsmount structure. 731 */ 732 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 733 nmp->nm_flag |= NFSMNT_DISMNT; 734 735 /* 736 * There are two reference counts to get rid of here. 737 */ 738 vrele(vp); 739 vrele(vp); 740 vgone(vp); 741 nfs_disconnect(nmp); 742 m_freem(nmp->nm_nam); 743 744 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 745 free((caddr_t)nmp, M_NFSMNT); 746 return (0); 747 } 748 749 /* 750 * Return root of a filesystem 751 */ 752 int 753 nfs_root(mp, vpp) 754 struct mount *mp; 755 struct vnode **vpp; 756 { 757 register struct vnode *vp; 758 struct nfsmount *nmp; 759 struct nfsnode *np; 760 int error; 761 762 nmp = VFSTONFS(mp); 763 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 764 if (error) 765 return (error); 766 vp = NFSTOV(np); 767 vp->v_type = VDIR; 768 vp->v_flag = VROOT; 769 *vpp = vp; 770 return (0); 771 } 772 773 extern int syncprt; 774 775 /* 776 * Flush out the buffer cache 777 */ 778 /* ARGSUSED */ 779 int 780 nfs_sync(mp, waitfor, cred, p) 781 struct mount *mp; 782 int waitfor; 783 struct ucred *cred; 784 struct proc *p; 785 { 786 register struct vnode *vp; 787 int error, allerror = 0; 788 789 /* 790 * Force stale buffer cache information to be flushed. 791 */ 792 loop: 793 for (vp = mp->mnt_vnodelist.lh_first; 794 vp != NULL; 795 vp = vp->v_mntvnodes.le_next) { 796 /* 797 * If the vnode that we are about to sync is no longer 798 * associated with this mount point, start over. 799 */ 800 if (vp->v_mount != mp) 801 goto loop; 802 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 803 continue; 804 if (vget(vp, LK_EXCLUSIVE, p)) 805 goto loop; 806 error = VOP_FSYNC(vp, cred, waitfor, p); 807 if (error) 808 allerror = error; 809 vput(vp); 810 } 811 return (allerror); 812 } 813 814 /* 815 * NFS flat namespace lookup. 816 * Currently unsupported. 817 */ 818 /* ARGSUSED */ 819 int 820 nfs_vget(mp, ino, vpp) 821 struct mount *mp; 822 ino_t ino; 823 struct vnode **vpp; 824 { 825 826 return (EOPNOTSUPP); 827 } 828 829 /* 830 * At this point, this should never happen 831 */ 832 /* ARGSUSED */ 833 int 834 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 835 register struct mount *mp; 836 struct fid *fhp; 837 struct mbuf *nam; 838 struct vnode **vpp; 839 int *exflagsp; 840 struct ucred **credanonp; 841 { 842 843 return (EINVAL); 844 } 845 846 /* 847 * Vnode pointer to File handle, should never happen either 848 */ 849 /* ARGSUSED */ 850 int 851 nfs_vptofh(vp, fhp) 852 struct vnode *vp; 853 struct fid *fhp; 854 { 855 856 return (EINVAL); 857 } 858 859 /* 860 * Vfs start routine, a no-op. 861 */ 862 /* ARGSUSED */ 863 int 864 nfs_start(mp, flags, p) 865 struct mount *mp; 866 int flags; 867 struct proc *p; 868 { 869 870 return (0); 871 } 872 873 /* 874 * Do operations associated with quotas, not supported 875 */ 876 /* ARGSUSED */ 877 int 878 nfs_quotactl(mp, cmd, uid, arg, p) 879 struct mount *mp; 880 int cmd; 881 uid_t uid; 882 caddr_t arg; 883 struct proc *p; 884 { 885 886 return (EOPNOTSUPP); 887 } 888 889 /* 890 * Do that sysctl thang... 891 */ 892 static int 893 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 894 size_t newlen, struct proc *p) 895 { 896 int rv; 897 898 /* 899 * All names at this level are terminal. 900 */ 901 if(namelen > 1) 902 return ENOTDIR; /* overloaded */ 903 904 switch(name[0]) { 905 case NFS_NFSSTATS: 906 if(!oldp) { 907 *oldlenp = sizeof nfsstats; 908 return 0; 909 } 910 911 if(*oldlenp < sizeof nfsstats) { 912 *oldlenp = sizeof nfsstats; 913 return ENOMEM; 914 } 915 916 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 917 if(rv) return rv; 918 919 if(newp && newlen != sizeof nfsstats) 920 return EINVAL; 921 922 if(newp) { 923 return copyin(newp, &nfsstats, sizeof nfsstats); 924 } 925 return 0; 926 927 default: 928 return EOPNOTSUPP; 929 } 930 } 931 932
Indexes created Wed Oct 01 07:09:59 GMT 2025