nfs_vfsops.c revision 1.56
1 /* $NetBSD: nfs_vfsops.c,v 1.56 1997/01/31 03:00:31 thorpej 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/device.h> 48 #include <sys/vnode.h> 49 #include <sys/kernel.h> 50 #include <sys/mount.h> 51 #include <sys/buf.h> 52 #include <sys/mbuf.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/systm.h> 56 57 #include <net/if.h> 58 #include <net/route.h> 59 #include <netinet/in.h> 60 61 #include <nfs/rpcv2.h> 62 #include <nfs/nfsproto.h> 63 #include <nfs/nfsnode.h> 64 #include <nfs/nfs.h> 65 #include <nfs/nfsmount.h> 66 #include <nfs/xdr_subs.h> 67 #include <nfs/nfsm_subs.h> 68 #include <nfs/nfsdiskless.h> 69 #include <nfs/nqnfs.h> 70 #include <nfs/nfs_var.h> 71 72 extern struct nfsstats nfsstats; 73 extern int nfs_ticks; 74 75 #ifdef notyet 76 static int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 77 struct proc *); 78 #endif 79 80 /* 81 * nfs vfs operations. 82 */ 83 struct vfsops nfs_vfsops = { 84 MOUNT_NFS, 85 nfs_mount, 86 nfs_start, 87 nfs_unmount, 88 nfs_root, 89 nfs_quotactl, 90 nfs_statfs, 91 nfs_sync, 92 nfs_vget, 93 nfs_fhtovp, 94 nfs_vptofh, 95 nfs_vfs_init, 96 nfs_mountroot, 97 #ifdef notyet 98 nfs_sysctl 99 #endif 100 }; 101 102 extern u_int32_t nfs_procids[NFS_NPROCS]; 103 extern u_int32_t nfs_prog, nfs_vers; 104 105 static struct mount * 106 nfs_mount_diskless __P((struct nfs_dlmount *, const char *, int, 107 struct vnode **)); 108 109 #define TRUE 1 110 #define FALSE 0 111 112 /* 113 * nfs statfs call 114 */ 115 int 116 nfs_statfs(mp, sbp, p) 117 struct mount *mp; 118 register struct statfs *sbp; 119 struct proc *p; 120 { 121 register struct vnode *vp; 122 register struct nfs_statfs *sfp; 123 register caddr_t cp; 124 register u_int32_t *tl; 125 register int32_t t1, t2; 126 caddr_t bpos, dpos, cp2; 127 struct nfsmount *nmp = VFSTONFS(mp); 128 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 129 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2; 130 struct ucred *cred; 131 struct nfsnode *np; 132 u_quad_t tquad; 133 134 #ifndef nolint 135 sfp = (struct nfs_statfs *)0; 136 #endif 137 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 138 if (error) 139 return (error); 140 vp = NFSTOV(np); 141 cred = crget(); 142 cred->cr_ngroups = 0; 143 if (v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 144 (void)nfs_fsinfo(nmp, vp, cred, p); 145 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 146 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 147 nfsm_fhtom(vp, v3); 148 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 149 if (v3) 150 nfsm_postop_attr(vp, retattr); 151 if (error) { 152 if (mrep != NULL) 153 m_free(mrep); 154 goto nfsmout; 155 } 156 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 157 #ifdef COMPAT_09 158 sbp->f_type = 2; 159 #else 160 sbp->f_type = 0; 161 #endif 162 sbp->f_flags = nmp->nm_flag; 163 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 164 if (v3) { 165 sbp->f_bsize = NFS_FABLKSIZE; 166 fxdr_hyper(&sfp->sf_tbytes, &tquad); 167 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 168 fxdr_hyper(&sfp->sf_fbytes, &tquad); 169 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 170 fxdr_hyper(&sfp->sf_abytes, &tquad); 171 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 172 sbp->f_files = (fxdr_unsigned(int32_t, 173 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 174 sbp->f_ffree = (fxdr_unsigned(int32_t, 175 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 176 } else { 177 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 178 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 179 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 180 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 181 sbp->f_files = 0; 182 sbp->f_ffree = 0; 183 } 184 if (sbp != &mp->mnt_stat) { 185 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 186 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 187 } 188 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 189 nfsm_reqdone; 190 vrele(vp); 191 crfree(cred); 192 return (error); 193 } 194 195 /* 196 * nfs version 3 fsinfo rpc call 197 */ 198 int 199 nfs_fsinfo(nmp, vp, cred, p) 200 register struct nfsmount *nmp; 201 register struct vnode *vp; 202 struct ucred *cred; 203 struct proc *p; 204 { 205 register struct nfsv3_fsinfo *fsp; 206 register caddr_t cp; 207 register int32_t t1, t2; 208 register u_int32_t *tl, pref, max; 209 caddr_t bpos, dpos, cp2; 210 int error = 0, retattr; 211 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 212 213 nfsstats.rpccnt[NFSPROC_FSINFO]++; 214 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 215 nfsm_fhtom(vp, 1); 216 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 217 nfsm_postop_attr(vp, retattr); 218 if (!error) { 219 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 220 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 221 if (pref < nmp->nm_wsize) 222 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 223 ~(NFS_FABLKSIZE - 1); 224 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 225 if (max < nmp->nm_wsize) { 226 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 227 if (nmp->nm_wsize == 0) 228 nmp->nm_wsize = max; 229 } 230 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 231 if (pref < nmp->nm_rsize) 232 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 233 ~(NFS_FABLKSIZE - 1); 234 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 235 if (max < nmp->nm_rsize) { 236 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 237 if (nmp->nm_rsize == 0) 238 nmp->nm_rsize = max; 239 } 240 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 241 if (pref < nmp->nm_readdirsize) 242 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 243 ~(NFS_DIRBLKSIZ - 1); 244 if (max < nmp->nm_readdirsize) { 245 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 246 if (nmp->nm_readdirsize == 0) 247 nmp->nm_readdirsize = max; 248 } 249 nmp->nm_flag |= NFSMNT_GOTFSINFO; 250 } 251 nfsm_reqdone; 252 return (error); 253 } 254 255 /* 256 * Mount a remote root fs via. NFS. It goes like this: 257 * - Call nfs_boot_init() to fill in the nfs_diskless struct 258 * (using RARP, bootparam RPC, mountd RPC) 259 * - hand craft the swap nfs vnode hanging off a fake mount point 260 * if swdevt[0].sw_dev == NODEV 261 * - build the rootfs mount point and call mountnfs() to do the rest. 262 */ 263 int 264 nfs_mountroot() 265 { 266 struct nfs_diskless nd; 267 struct vattr attr; 268 struct mount *mp; 269 struct vnode *vp; 270 struct proc *procp; 271 long n; 272 int error; 273 274 procp = curproc; /* XXX */ 275 276 if (root_device->dv_class != DV_IFNET) 277 return (ENODEV); 278 279 /* 280 * XXX time must be non-zero when we init the interface or else 281 * the arp code will wedge. [Fixed now in if_ether.c] 282 * However, the NFS attribute cache gives false "hits" when 283 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 284 */ 285 if (time.tv_sec < NFS_MAXATTRTIMO) 286 time.tv_sec = NFS_MAXATTRTIMO; 287 288 /* 289 * Call nfs_boot_init() to fill in the nfs_diskless struct. 290 * Side effect: Finds and configures a network interface. 291 */ 292 bzero((caddr_t) &nd, sizeof(nd)); 293 error = nfs_boot_init(&nd, procp); 294 if (error) 295 return (error); 296 297 /* 298 * Create the root mount point. 299 */ 300 nfs_boot_getfh(&nd.nd_boot, "root", &nd.nd_root); 301 mp = nfs_mount_diskless(&nd.nd_root, "/", 0, &vp); 302 printf("root on %s\n", nd.nd_root.ndm_host); 303 304 /* 305 * Link it into the mount list. 306 */ 307 #ifdef Lite2_integrated 308 simple_lock(&mountlist_slock); 309 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 310 simple_unlock(&mountlist_slock); 311 rootvp = vp; 312 vfs_unbusy(mp, procp); 313 #else 314 if (vfs_lock(mp)) 315 panic("nfs_mountroot: vfs_lock"); 316 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 317 mp->mnt_vnodecovered = NULLVP; 318 vfs_unlock(mp); 319 rootvp = vp; 320 #endif 321 322 /* Get root attributes (for the time). */ 323 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 324 if (error) panic("nfs_mountroot: getattr for root"); 325 n = attr.va_mtime.tv_sec; 326 #ifdef DEBUG 327 printf("root time: 0x%lx\n", n); 328 #endif 329 inittodr(n); 330 331 /* 332 * XXX splnet, so networks will receive... 333 */ 334 splnet(); 335 336 #ifdef notyet 337 /* Set up swap credentials. */ 338 proc0.p_ucred->cr_uid = ntohl(nd.swap_ucred.cr_uid); 339 proc0.p_ucred->cr_gid = ntohl(nd.swap_ucred.cr_gid); 340 if ((proc0.p_ucred->cr_ngroups = ntohs(nd.swap_ucred.cr_ngroups)) > 341 NGROUPS) 342 proc0.p_ucred->cr_ngroups = NGROUPS; 343 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 344 proc0.p_ucred->cr_groups[i] = ntohl(nd.swap_ucred.cr_groups[i]); 345 #endif 346 347 /* 348 * "Mount" the swap device. 349 * 350 * On a "dataless" configuration (swap on disk) we will have: 351 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 352 */ 353 if (bdevvp(swapdev, &swapdev_vp)) 354 panic("nfs_mountroot: can't setup swap vp"); 355 if (swdevt[0].sw_dev != NODEV) { 356 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 357 return (0); 358 } 359 360 /* 361 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 362 * Create a fake mount point just for the swap vnode so that the 363 * swap file can be on a different server from the rootfs. 364 */ 365 nfs_boot_getfh(&nd.nd_boot, "swap", &nd.nd_swap); 366 mp = nfs_mount_diskless(&nd.nd_swap, "/swap", 0, &vp); 367 #ifdef Lite2_integrated 368 vfs_unbusy(mp, procp); 369 #endif 370 printf("swap on %s\n", nd.nd_swap.ndm_host); 371 372 /* 373 * Since the swap file is not the root dir of a file system, 374 * hack it to a regular file. 375 */ 376 vp->v_type = VREG; 377 vp->v_flag = 0; 378 swdevt[0].sw_vp = vp; 379 380 /* 381 * Find out how large the swap file is. 382 */ 383 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 384 if (error) 385 panic("nfs_mountroot: getattr for swap"); 386 n = (long) (attr.va_size >> DEV_BSHIFT); 387 #ifdef DEBUG 388 printf("swap size: 0x%lx (blocks)\n", n); 389 #endif 390 swdevt[0].sw_nblks = n; 391 392 return (0); 393 } 394 395 /* 396 * Internal version of mount system call for diskless setup. 397 */ 398 static struct mount * 399 nfs_mount_diskless(ndmntp, mntname, mntflag, vpp) 400 struct nfs_dlmount *ndmntp; 401 const char *mntname; 402 int mntflag; 403 struct vnode **vpp; 404 { 405 struct mount *mp; 406 struct mbuf *m; 407 int error; 408 409 #ifdef Lite2_integrated 410 vfs_rootmountalloc("nfs", mntname, &mp); 411 #else 412 /* Create the mount point. */ 413 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 414 M_MOUNT, M_WAITOK); 415 bzero((char *)mp, (u_long)sizeof(struct mount)); 416 #endif 417 mp->mnt_op = &nfs_vfsops; 418 mp->mnt_flag = mntflag; 419 420 /* Get mbuf for server sockaddr. */ 421 m = m_get(M_WAIT, MT_SONAME); 422 if (m == NULL) 423 panic("nfs_mountroot: mget soname for %s", mntname); 424 bcopy((caddr_t)ndmntp->ndm_args.addr, mtod(m, caddr_t), 425 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 426 427 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 428 ndmntp->ndm_args.hostname, vpp); 429 if (error) 430 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 431 432 return (mp); 433 } 434 435 void 436 nfs_decode_args(nmp, argp) 437 struct nfsmount *nmp; 438 struct nfs_args *argp; 439 { 440 int s; 441 int adjsock; 442 int maxio; 443 444 s = splsoftnet(); 445 446 /* Re-bind if rsrvd port requested and wasn't on one */ 447 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 448 && (argp->flags & NFSMNT_RESVPORT); 449 450 /* Update flags atomically. Don't change the lock bits. */ 451 nmp->nm_flag = 452 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 453 splx(s); 454 455 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 456 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 457 if (nmp->nm_timeo < NFS_MINTIMEO) 458 nmp->nm_timeo = NFS_MINTIMEO; 459 else if (nmp->nm_timeo > NFS_MAXTIMEO) 460 nmp->nm_timeo = NFS_MAXTIMEO; 461 } 462 463 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 464 nmp->nm_retry = argp->retrans; 465 if (nmp->nm_retry > NFS_MAXREXMIT) 466 nmp->nm_retry = NFS_MAXREXMIT; 467 } 468 469 if (argp->flags & NFSMNT_NFSV3) { 470 if (argp->sotype == SOCK_DGRAM) 471 maxio = NFS_MAXDGRAMDATA; 472 else 473 maxio = NFS_MAXDATA; 474 } else 475 maxio = NFS_V2MAXDATA; 476 477 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 478 int osize = nmp->nm_wsize; 479 nmp->nm_wsize = argp->wsize; 480 /* Round down to multiple of blocksize */ 481 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 482 if (nmp->nm_wsize <= 0) 483 nmp->nm_wsize = NFS_FABLKSIZE; 484 adjsock |= (nmp->nm_wsize != osize); 485 } 486 if (nmp->nm_wsize > maxio) 487 nmp->nm_wsize = maxio; 488 if (nmp->nm_wsize > MAXBSIZE) 489 nmp->nm_wsize = MAXBSIZE; 490 491 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 492 int osize = nmp->nm_rsize; 493 nmp->nm_rsize = argp->rsize; 494 /* Round down to multiple of blocksize */ 495 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 496 if (nmp->nm_rsize <= 0) 497 nmp->nm_rsize = NFS_FABLKSIZE; 498 adjsock |= (nmp->nm_rsize != osize); 499 } 500 if (nmp->nm_rsize > maxio) 501 nmp->nm_rsize = maxio; 502 if (nmp->nm_rsize > MAXBSIZE) 503 nmp->nm_rsize = MAXBSIZE; 504 505 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 506 nmp->nm_readdirsize = argp->readdirsize; 507 /* Round down to multiple of blocksize */ 508 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 509 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 510 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 511 } else if (argp->flags & NFSMNT_RSIZE) 512 nmp->nm_readdirsize = nmp->nm_rsize; 513 514 if (nmp->nm_readdirsize > maxio) 515 nmp->nm_readdirsize = maxio; 516 517 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 518 argp->maxgrouplist <= NFS_MAXGRPS) 519 nmp->nm_numgrps = argp->maxgrouplist; 520 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 521 argp->readahead <= NFS_MAXRAHEAD) 522 nmp->nm_readahead = argp->readahead; 523 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 524 argp->leaseterm <= NQ_MAXLEASE) 525 nmp->nm_leaseterm = argp->leaseterm; 526 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 527 argp->deadthresh <= NQ_NEVERDEAD) 528 nmp->nm_deadthresh = argp->deadthresh; 529 530 adjsock |= ((nmp->nm_sotype != argp->sotype) || 531 (nmp->nm_soproto != argp->proto)); 532 nmp->nm_sotype = argp->sotype; 533 nmp->nm_soproto = argp->proto; 534 535 if (nmp->nm_so && adjsock) { 536 nfs_disconnect(nmp); 537 if (nmp->nm_sotype == SOCK_DGRAM) 538 while (nfs_connect(nmp, (struct nfsreq *)0)) { 539 printf("nfs_args: retrying connect\n"); 540 (void) tsleep((caddr_t)&lbolt, 541 PSOCK, "nfscon", 0); 542 } 543 } 544 } 545 546 /* 547 * VFS Operations. 548 * 549 * mount system call 550 * It seems a bit dumb to copyinstr() the host and path here and then 551 * bcopy() them in mountnfs(), but I wanted to detect errors before 552 * doing the sockargs() call because sockargs() allocates an mbuf and 553 * an error after that means that I have to release the mbuf. 554 */ 555 /* ARGSUSED */ 556 int 557 nfs_mount(mp, path, data, ndp, p) 558 struct mount *mp; 559 const char *path; 560 void *data; 561 struct nameidata *ndp; 562 struct proc *p; 563 { 564 int error; 565 struct nfs_args args; 566 struct mbuf *nam; 567 struct vnode *vp; 568 char pth[MNAMELEN], hst[MNAMELEN]; 569 size_t len; 570 u_char nfh[NFSX_V3FHMAX]; 571 572 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 573 if (error) 574 return (error); 575 if (args.version != NFS_ARGSVERSION) 576 return (EPROGMISMATCH); 577 if (mp->mnt_flag & MNT_UPDATE) { 578 register struct nfsmount *nmp = VFSTONFS(mp); 579 580 if (nmp == NULL) 581 return (EIO); 582 /* 583 * When doing an update, we can't change from or to 584 * v3 and/or nqnfs. 585 */ 586 args.flags = (args.flags & ~(NFSMNT_NFSV3|NFSMNT_NQNFS)) | 587 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_NQNFS)); 588 nfs_decode_args(nmp, &args); 589 return (0); 590 } 591 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 592 if (error) 593 return (error); 594 error = copyinstr(path, pth, MNAMELEN-1, &len); 595 if (error) 596 return (error); 597 bzero(&pth[len], MNAMELEN - len); 598 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 599 if (error) 600 return (error); 601 bzero(&hst[len], MNAMELEN - len); 602 /* sockargs() call must be after above copyin() calls */ 603 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 604 if (error) 605 return (error); 606 args.fh = nfh; 607 error = mountnfs(&args, mp, nam, pth, hst, &vp); 608 return (error); 609 } 610 611 /* 612 * Common code for mount and mountroot 613 */ 614 int 615 mountnfs(argp, mp, nam, pth, hst, vpp) 616 register struct nfs_args *argp; 617 register struct mount *mp; 618 struct mbuf *nam; 619 const char *pth, *hst; 620 struct vnode **vpp; 621 { 622 register struct nfsmount *nmp; 623 struct nfsnode *np; 624 int error; 625 struct vattr attrs; 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 TAILQ_INIT(&nmp->nm_bufq); 639 } 640 #ifdef Lite2_integrated 641 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 642 #else 643 getnewfsid(mp, makefstype(MOUNT_NFS)); 644 #endif 645 nmp->nm_mountp = mp; 646 if (argp->flags & NFSMNT_NQNFS) 647 /* 648 * We have to set mnt_maxsymlink to a non-zero value so 649 * that COMPAT_43 routines will know that we are setting 650 * the d_type field in directories (and can zero it for 651 * unsuspecting binaries). 652 */ 653 mp->mnt_maxsymlinklen = 1; 654 nmp->nm_timeo = NFS_TIMEO; 655 nmp->nm_retry = NFS_RETRANS; 656 nmp->nm_wsize = NFS_WSIZE; 657 nmp->nm_rsize = NFS_RSIZE; 658 nmp->nm_readdirsize = NFS_READDIRSIZE; 659 nmp->nm_numgrps = NFS_MAXGRPS; 660 nmp->nm_readahead = NFS_DEFRAHEAD; 661 nmp->nm_leaseterm = NQ_DEFLEASE; 662 nmp->nm_deadthresh = NQ_DEADTHRESH; 663 CIRCLEQ_INIT(&nmp->nm_timerhead); 664 nmp->nm_inprog = NULLVP; 665 nmp->nm_fhsize = argp->fhsize; 666 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 667 #ifdef COMPAT_09 668 mp->mnt_stat.f_type = 2; 669 #else 670 mp->mnt_stat.f_type = 0; 671 #endif 672 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 673 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 674 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 675 nmp->nm_nam = nam; 676 677 /* Set up the sockets and per-host congestion */ 678 nmp->nm_sotype = argp->sotype; 679 nmp->nm_soproto = argp->proto; 680 681 nfs_decode_args(nmp, argp); 682 683 /* 684 * For Connection based sockets (TCP,...) defer the connect until 685 * the first request, in case the server is not responding. 686 */ 687 if (nmp->nm_sotype == SOCK_DGRAM && 688 (error = nfs_connect(nmp, (struct nfsreq *)0))) 689 goto bad; 690 691 /* 692 * This is silly, but it has to be set so that vinifod() works. 693 * We do not want to do an nfs_statfs() here since we can get 694 * stuck on a dead server and we are holding a lock on the mount 695 * point. 696 */ 697 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 698 /* 699 * A reference count is needed on the nfsnode representing the 700 * remote root. If this object is not persistent, then backward 701 * traversals of the mount point (i.e. "..") will not work if 702 * the nfsnode gets flushed out of the cache. Ufs does not have 703 * this problem, because one can identify root inodes by their 704 * number == ROOTINO (2). 705 */ 706 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 707 if (error) 708 goto bad; 709 *vpp = NFSTOV(np); 710 VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc); /* XXX */ 711 712 return (0); 713 bad: 714 nfs_disconnect(nmp); 715 free((caddr_t)nmp, M_NFSMNT); 716 m_freem(nam); 717 return (error); 718 } 719 720 /* 721 * unmount system call 722 */ 723 int 724 nfs_unmount(mp, mntflags, p) 725 struct mount *mp; 726 int mntflags; 727 struct proc *p; 728 { 729 register struct nfsmount *nmp; 730 struct nfsnode *np; 731 struct vnode *vp; 732 int error, flags = 0; 733 734 if (mntflags & MNT_FORCE) 735 flags |= FORCECLOSE; 736 nmp = VFSTONFS(mp); 737 /* 738 * Goes something like this.. 739 * - Check for activity on the root vnode (other than ourselves). 740 * - Call vflush() to clear out vnodes for this file system, 741 * except for the root vnode. 742 * - Decrement reference on the vnode representing remote root. 743 * - Close the socket 744 * - Free up the data structures 745 */ 746 /* 747 * We need to decrement the ref. count on the nfsnode representing 748 * the remote root. See comment in mountnfs(). The VFS unmount() 749 * has done vput on this vnode, otherwise we would get deadlock! 750 */ 751 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 752 if (error) 753 return(error); 754 vp = NFSTOV(np); 755 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 756 vput(vp); 757 return (EBUSY); 758 } 759 760 /* 761 * Must handshake with nqnfs_clientd() if it is active. 762 */ 763 nmp->nm_flag |= NFSMNT_DISMINPROG; 764 while (nmp->nm_inprog != NULLVP) 765 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 766 error = vflush(mp, vp, flags); 767 if (error) { 768 vput(vp); 769 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 770 return (error); 771 } 772 773 /* 774 * We are now committed to the unmount. 775 * For NQNFS, let the server daemon free the nfsmount structure. 776 */ 777 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 778 nmp->nm_flag |= NFSMNT_DISMNT; 779 780 /* 781 * There are two reference counts to get rid of here. 782 */ 783 vrele(vp); 784 vrele(vp); 785 vgone(vp); 786 nfs_disconnect(nmp); 787 m_freem(nmp->nm_nam); 788 789 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 790 free((caddr_t)nmp, M_NFSMNT); 791 return (0); 792 } 793 794 /* 795 * Return root of a filesystem 796 */ 797 int 798 nfs_root(mp, vpp) 799 struct mount *mp; 800 struct vnode **vpp; 801 { 802 register struct vnode *vp; 803 struct nfsmount *nmp; 804 struct nfsnode *np; 805 int error; 806 807 nmp = VFSTONFS(mp); 808 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 809 if (error) 810 return (error); 811 vp = NFSTOV(np); 812 if (vp->v_type == VNON) 813 vp->v_type = VDIR; 814 vp->v_flag = VROOT; 815 *vpp = vp; 816 return (0); 817 } 818 819 extern int syncprt; 820 821 /* 822 * Flush out the buffer cache 823 */ 824 /* ARGSUSED */ 825 int 826 nfs_sync(mp, waitfor, cred, p) 827 struct mount *mp; 828 int waitfor; 829 struct ucred *cred; 830 struct proc *p; 831 { 832 register struct vnode *vp; 833 int error, allerror = 0; 834 835 /* 836 * Force stale buffer cache information to be flushed. 837 */ 838 loop: 839 for (vp = mp->mnt_vnodelist.lh_first; 840 vp != NULL; 841 vp = vp->v_mntvnodes.le_next) { 842 /* 843 * If the vnode that we are about to sync is no longer 844 * associated with this mount point, start over. 845 */ 846 if (vp->v_mount != mp) 847 goto loop; 848 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 849 continue; 850 #ifdef Lite2_integrated 851 if (vget(vp, LK_EXCLUSIVE, p)) 852 #else 853 if (vget(vp, 1)) 854 #endif 855 goto loop; 856 error = VOP_FSYNC(vp, cred, waitfor, p); 857 if (error) 858 allerror = error; 859 vput(vp); 860 } 861 return (allerror); 862 } 863 864 /* 865 * NFS flat namespace lookup. 866 * Currently unsupported. 867 */ 868 /* ARGSUSED */ 869 int 870 nfs_vget(mp, ino, vpp) 871 struct mount *mp; 872 ino_t ino; 873 struct vnode **vpp; 874 { 875 876 return (EOPNOTSUPP); 877 } 878 879 #ifdef notyet 880 /* 881 * Do that sysctl thang... 882 */ 883 static int 884 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 885 size_t newlen, struct proc *p) 886 { 887 int rv; 888 889 /* 890 * All names at this level are terminal. 891 */ 892 if(namelen > 1) 893 return ENOTDIR; /* overloaded */ 894 895 switch(name[0]) { 896 case NFS_NFSSTATS: 897 if(!oldp) { 898 *oldlenp = sizeof nfsstats; 899 return 0; 900 } 901 902 if(*oldlenp < sizeof nfsstats) { 903 *oldlenp = sizeof nfsstats; 904 return ENOMEM; 905 } 906 907 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 908 if(rv) return rv; 909 910 if(newp && newlen != sizeof nfsstats) 911 return EINVAL; 912 913 if(newp) { 914 return copyin(newp, &nfsstats, sizeof nfsstats); 915 } 916 return 0; 917 918 default: 919 return EOPNOTSUPP; 920 } 921 } 922 #endif 923 924 925 /* 926 * At this point, this should never happen 927 */ 928 /* ARGSUSED */ 929 int 930 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 931 register struct mount *mp; 932 struct fid *fhp; 933 struct mbuf *nam; 934 struct vnode **vpp; 935 int *exflagsp; 936 struct ucred **credanonp; 937 { 938 939 return (EINVAL); 940 } 941 942 /* 943 * Vnode pointer to File handle, should never happen either 944 */ 945 /* ARGSUSED */ 946 int 947 nfs_vptofh(vp, fhp) 948 struct vnode *vp; 949 struct fid *fhp; 950 { 951 952 return (EINVAL); 953 } 954 955 /* 956 * Vfs start routine, a no-op. 957 */ 958 /* ARGSUSED */ 959 int 960 nfs_start(mp, flags, p) 961 struct mount *mp; 962 int flags; 963 struct proc *p; 964 { 965 966 return (0); 967 } 968 969 /* 970 * Do operations associated with quotas, not supported 971 */ 972 /* ARGSUSED */ 973 int 974 nfs_quotactl(mp, cmd, uid, arg, p) 975 struct mount *mp; 976 int cmd; 977 uid_t uid; 978 caddr_t arg; 979 struct proc *p; 980 { 981 982 return (EOPNOTSUPP); 983 } 984
Indexes created Thu Sep 25 16:09:42 GMT 2025