nfs_vfsops.c revision 1.58
1 /* $NetBSD: nfs_vfsops.c,v 1.58 1997/02/22 02:48:26 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/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 /* 447 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 448 * no sense in that context. 449 */ 450 if (argp->sotype == SOCK_STREAM) 451 argp->flags &= ~NFSMNT_NOCONN; 452 453 /* Re-bind if rsrvd port requested and wasn't on one */ 454 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 455 && (argp->flags & NFSMNT_RESVPORT); 456 /* Also re-bind if we're switching to/from a connected UDP socket */ 457 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 458 (argp->flags & NFSMNT_NOCONN)); 459 460 /* Update flags atomically. Don't change the lock bits. */ 461 nmp->nm_flag = 462 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 463 splx(s); 464 465 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 466 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 467 if (nmp->nm_timeo < NFS_MINTIMEO) 468 nmp->nm_timeo = NFS_MINTIMEO; 469 else if (nmp->nm_timeo > NFS_MAXTIMEO) 470 nmp->nm_timeo = NFS_MAXTIMEO; 471 } 472 473 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 474 nmp->nm_retry = argp->retrans; 475 if (nmp->nm_retry > NFS_MAXREXMIT) 476 nmp->nm_retry = NFS_MAXREXMIT; 477 } 478 479 if (argp->flags & NFSMNT_NFSV3) { 480 if (argp->sotype == SOCK_DGRAM) 481 maxio = NFS_MAXDGRAMDATA; 482 else 483 maxio = NFS_MAXDATA; 484 } else 485 maxio = NFS_V2MAXDATA; 486 487 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 488 int osize = nmp->nm_wsize; 489 nmp->nm_wsize = argp->wsize; 490 /* Round down to multiple of blocksize */ 491 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 492 if (nmp->nm_wsize <= 0) 493 nmp->nm_wsize = NFS_FABLKSIZE; 494 adjsock |= (nmp->nm_wsize != osize); 495 } 496 if (nmp->nm_wsize > maxio) 497 nmp->nm_wsize = maxio; 498 if (nmp->nm_wsize > MAXBSIZE) 499 nmp->nm_wsize = MAXBSIZE; 500 501 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 502 int osize = nmp->nm_rsize; 503 nmp->nm_rsize = argp->rsize; 504 /* Round down to multiple of blocksize */ 505 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 506 if (nmp->nm_rsize <= 0) 507 nmp->nm_rsize = NFS_FABLKSIZE; 508 adjsock |= (nmp->nm_rsize != osize); 509 } 510 if (nmp->nm_rsize > maxio) 511 nmp->nm_rsize = maxio; 512 if (nmp->nm_rsize > MAXBSIZE) 513 nmp->nm_rsize = MAXBSIZE; 514 515 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 516 nmp->nm_readdirsize = argp->readdirsize; 517 /* Round down to multiple of blocksize */ 518 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 519 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 520 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 521 } else if (argp->flags & NFSMNT_RSIZE) 522 nmp->nm_readdirsize = nmp->nm_rsize; 523 524 if (nmp->nm_readdirsize > maxio) 525 nmp->nm_readdirsize = maxio; 526 527 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 528 argp->maxgrouplist <= NFS_MAXGRPS) 529 nmp->nm_numgrps = argp->maxgrouplist; 530 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 531 argp->readahead <= NFS_MAXRAHEAD) 532 nmp->nm_readahead = argp->readahead; 533 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 534 argp->leaseterm <= NQ_MAXLEASE) 535 nmp->nm_leaseterm = argp->leaseterm; 536 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 537 argp->deadthresh <= NQ_NEVERDEAD) 538 nmp->nm_deadthresh = argp->deadthresh; 539 540 adjsock |= ((nmp->nm_sotype != argp->sotype) || 541 (nmp->nm_soproto != argp->proto)); 542 nmp->nm_sotype = argp->sotype; 543 nmp->nm_soproto = argp->proto; 544 545 if (nmp->nm_so && adjsock) { 546 nfs_disconnect(nmp); 547 if (nmp->nm_sotype == SOCK_DGRAM) 548 while (nfs_connect(nmp, (struct nfsreq *)0)) { 549 printf("nfs_args: retrying connect\n"); 550 (void) tsleep((caddr_t)&lbolt, 551 PSOCK, "nfscon", 0); 552 } 553 } 554 } 555 556 /* 557 * VFS Operations. 558 * 559 * mount system call 560 * It seems a bit dumb to copyinstr() the host and path here and then 561 * bcopy() them in mountnfs(), but I wanted to detect errors before 562 * doing the sockargs() call because sockargs() allocates an mbuf and 563 * an error after that means that I have to release the mbuf. 564 */ 565 /* ARGSUSED */ 566 int 567 nfs_mount(mp, path, data, ndp, p) 568 struct mount *mp; 569 const char *path; 570 void *data; 571 struct nameidata *ndp; 572 struct proc *p; 573 { 574 int error; 575 struct nfs_args args; 576 struct mbuf *nam; 577 struct vnode *vp; 578 char pth[MNAMELEN], hst[MNAMELEN]; 579 size_t len; 580 u_char nfh[NFSX_V3FHMAX]; 581 582 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 583 if (error) 584 return (error); 585 if (args.version != NFS_ARGSVERSION) 586 return (EPROGMISMATCH); 587 if (mp->mnt_flag & MNT_UPDATE) { 588 register struct nfsmount *nmp = VFSTONFS(mp); 589 590 if (nmp == NULL) 591 return (EIO); 592 /* 593 * When doing an update, we can't change from or to 594 * v3 and/or nqnfs. 595 */ 596 args.flags = (args.flags & ~(NFSMNT_NFSV3|NFSMNT_NQNFS)) | 597 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_NQNFS)); 598 nfs_decode_args(nmp, &args); 599 return (0); 600 } 601 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 602 if (error) 603 return (error); 604 error = copyinstr(path, pth, MNAMELEN-1, &len); 605 if (error) 606 return (error); 607 bzero(&pth[len], MNAMELEN - len); 608 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 609 if (error) 610 return (error); 611 bzero(&hst[len], MNAMELEN - len); 612 /* sockargs() call must be after above copyin() calls */ 613 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 614 if (error) 615 return (error); 616 args.fh = nfh; 617 error = mountnfs(&args, mp, nam, pth, hst, &vp); 618 return (error); 619 } 620 621 /* 622 * Common code for mount and mountroot 623 */ 624 int 625 mountnfs(argp, mp, nam, pth, hst, vpp) 626 register struct nfs_args *argp; 627 register struct mount *mp; 628 struct mbuf *nam; 629 const char *pth, *hst; 630 struct vnode **vpp; 631 { 632 register struct nfsmount *nmp; 633 struct nfsnode *np; 634 int error; 635 struct vattr attrs; 636 637 if (mp->mnt_flag & MNT_UPDATE) { 638 nmp = VFSTONFS(mp); 639 /* update paths, file handles, etc, here XXX */ 640 m_freem(nam); 641 return (0); 642 } else { 643 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 644 M_NFSMNT, M_WAITOK); 645 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 646 mp->mnt_data = (qaddr_t)nmp; 647 TAILQ_INIT(&nmp->nm_uidlruhead); 648 TAILQ_INIT(&nmp->nm_bufq); 649 } 650 #ifdef Lite2_integrated 651 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 652 #else 653 getnewfsid(mp, makefstype(MOUNT_NFS)); 654 #endif 655 nmp->nm_mountp = mp; 656 if (argp->flags & NFSMNT_NQNFS) 657 /* 658 * We have to set mnt_maxsymlink to a non-zero value so 659 * that COMPAT_43 routines will know that we are setting 660 * the d_type field in directories (and can zero it for 661 * unsuspecting binaries). 662 */ 663 mp->mnt_maxsymlinklen = 1; 664 nmp->nm_timeo = NFS_TIMEO; 665 nmp->nm_retry = NFS_RETRANS; 666 nmp->nm_wsize = NFS_WSIZE; 667 nmp->nm_rsize = NFS_RSIZE; 668 nmp->nm_readdirsize = NFS_READDIRSIZE; 669 nmp->nm_numgrps = NFS_MAXGRPS; 670 nmp->nm_readahead = NFS_DEFRAHEAD; 671 nmp->nm_leaseterm = NQ_DEFLEASE; 672 nmp->nm_deadthresh = NQ_DEADTHRESH; 673 CIRCLEQ_INIT(&nmp->nm_timerhead); 674 nmp->nm_inprog = NULLVP; 675 nmp->nm_fhsize = argp->fhsize; 676 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 677 #ifdef COMPAT_09 678 mp->mnt_stat.f_type = 2; 679 #else 680 mp->mnt_stat.f_type = 0; 681 #endif 682 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 683 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 684 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 685 nmp->nm_nam = nam; 686 687 /* Set up the sockets and per-host congestion */ 688 nmp->nm_sotype = argp->sotype; 689 nmp->nm_soproto = argp->proto; 690 691 nfs_decode_args(nmp, argp); 692 693 /* 694 * For Connection based sockets (TCP,...) defer the connect until 695 * the first request, in case the server is not responding. 696 */ 697 if (nmp->nm_sotype == SOCK_DGRAM && 698 (error = nfs_connect(nmp, (struct nfsreq *)0))) 699 goto bad; 700 701 /* 702 * This is silly, but it has to be set so that vinifod() works. 703 * We do not want to do an nfs_statfs() here since we can get 704 * stuck on a dead server and we are holding a lock on the mount 705 * point. 706 */ 707 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 708 /* 709 * A reference count is needed on the nfsnode representing the 710 * remote root. If this object is not persistent, then backward 711 * traversals of the mount point (i.e. "..") will not work if 712 * the nfsnode gets flushed out of the cache. Ufs does not have 713 * this problem, because one can identify root inodes by their 714 * number == ROOTINO (2). 715 */ 716 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 717 if (error) 718 goto bad; 719 *vpp = NFSTOV(np); 720 VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc); /* XXX */ 721 722 return (0); 723 bad: 724 nfs_disconnect(nmp); 725 free((caddr_t)nmp, M_NFSMNT); 726 m_freem(nam); 727 return (error); 728 } 729 730 /* 731 * unmount system call 732 */ 733 int 734 nfs_unmount(mp, mntflags, p) 735 struct mount *mp; 736 int mntflags; 737 struct proc *p; 738 { 739 register struct nfsmount *nmp; 740 struct nfsnode *np; 741 struct vnode *vp; 742 int error, flags = 0; 743 744 if (mntflags & MNT_FORCE) 745 flags |= FORCECLOSE; 746 nmp = VFSTONFS(mp); 747 /* 748 * Goes something like this.. 749 * - Check for activity on the root vnode (other than ourselves). 750 * - Call vflush() to clear out vnodes for this file system, 751 * except for the root vnode. 752 * - Decrement reference on the vnode representing remote root. 753 * - Close the socket 754 * - Free up the data structures 755 */ 756 /* 757 * We need to decrement the ref. count on the nfsnode representing 758 * the remote root. See comment in mountnfs(). The VFS unmount() 759 * has done vput on this vnode, otherwise we would get deadlock! 760 */ 761 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 762 if (error) 763 return(error); 764 vp = NFSTOV(np); 765 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 766 vput(vp); 767 return (EBUSY); 768 } 769 770 /* 771 * Must handshake with nqnfs_clientd() if it is active. 772 */ 773 nmp->nm_flag |= NFSMNT_DISMINPROG; 774 while (nmp->nm_inprog != NULLVP) 775 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 776 error = vflush(mp, vp, flags); 777 if (error) { 778 vput(vp); 779 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 780 return (error); 781 } 782 783 /* 784 * We are now committed to the unmount. 785 * For NQNFS, let the server daemon free the nfsmount structure. 786 */ 787 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 788 nmp->nm_flag |= NFSMNT_DISMNT; 789 790 /* 791 * There are two reference counts to get rid of here. 792 */ 793 vrele(vp); 794 vrele(vp); 795 vgone(vp); 796 nfs_disconnect(nmp); 797 m_freem(nmp->nm_nam); 798 799 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 800 free((caddr_t)nmp, M_NFSMNT); 801 return (0); 802 } 803 804 /* 805 * Return root of a filesystem 806 */ 807 int 808 nfs_root(mp, vpp) 809 struct mount *mp; 810 struct vnode **vpp; 811 { 812 register struct vnode *vp; 813 struct nfsmount *nmp; 814 struct nfsnode *np; 815 int error; 816 817 nmp = VFSTONFS(mp); 818 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 819 if (error) 820 return (error); 821 vp = NFSTOV(np); 822 if (vp->v_type == VNON) 823 vp->v_type = VDIR; 824 vp->v_flag = VROOT; 825 *vpp = vp; 826 return (0); 827 } 828 829 extern int syncprt; 830 831 /* 832 * Flush out the buffer cache 833 */ 834 /* ARGSUSED */ 835 int 836 nfs_sync(mp, waitfor, cred, p) 837 struct mount *mp; 838 int waitfor; 839 struct ucred *cred; 840 struct proc *p; 841 { 842 register struct vnode *vp; 843 int error, allerror = 0; 844 845 /* 846 * Force stale buffer cache information to be flushed. 847 */ 848 loop: 849 for (vp = mp->mnt_vnodelist.lh_first; 850 vp != NULL; 851 vp = vp->v_mntvnodes.le_next) { 852 /* 853 * If the vnode that we are about to sync is no longer 854 * associated with this mount point, start over. 855 */ 856 if (vp->v_mount != mp) 857 goto loop; 858 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 859 continue; 860 #ifdef Lite2_integrated 861 if (vget(vp, LK_EXCLUSIVE, p)) 862 #else 863 if (vget(vp, 1)) 864 #endif 865 goto loop; 866 error = VOP_FSYNC(vp, cred, waitfor, p); 867 if (error) 868 allerror = error; 869 vput(vp); 870 } 871 return (allerror); 872 } 873 874 /* 875 * NFS flat namespace lookup. 876 * Currently unsupported. 877 */ 878 /* ARGSUSED */ 879 int 880 nfs_vget(mp, ino, vpp) 881 struct mount *mp; 882 ino_t ino; 883 struct vnode **vpp; 884 { 885 886 return (EOPNOTSUPP); 887 } 888 889 #ifdef notyet 890 /* 891 * Do that sysctl thang... 892 */ 893 static int 894 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 895 size_t newlen, struct proc *p) 896 { 897 int rv; 898 899 /* 900 * All names at this level are terminal. 901 */ 902 if(namelen > 1) 903 return ENOTDIR; /* overloaded */ 904 905 switch(name[0]) { 906 case NFS_NFSSTATS: 907 if(!oldp) { 908 *oldlenp = sizeof nfsstats; 909 return 0; 910 } 911 912 if(*oldlenp < sizeof nfsstats) { 913 *oldlenp = sizeof nfsstats; 914 return ENOMEM; 915 } 916 917 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 918 if(rv) return rv; 919 920 if(newp && newlen != sizeof nfsstats) 921 return EINVAL; 922 923 if(newp) { 924 return copyin(newp, &nfsstats, sizeof nfsstats); 925 } 926 return 0; 927 928 default: 929 return EOPNOTSUPP; 930 } 931 } 932 #endif 933 934 935 /* 936 * At this point, this should never happen 937 */ 938 /* ARGSUSED */ 939 int 940 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 941 register struct mount *mp; 942 struct fid *fhp; 943 struct mbuf *nam; 944 struct vnode **vpp; 945 int *exflagsp; 946 struct ucred **credanonp; 947 { 948 949 return (EINVAL); 950 } 951 952 /* 953 * Vnode pointer to File handle, should never happen either 954 */ 955 /* ARGSUSED */ 956 int 957 nfs_vptofh(vp, fhp) 958 struct vnode *vp; 959 struct fid *fhp; 960 { 961 962 return (EINVAL); 963 } 964 965 /* 966 * Vfs start routine, a no-op. 967 */ 968 /* ARGSUSED */ 969 int 970 nfs_start(mp, flags, p) 971 struct mount *mp; 972 int flags; 973 struct proc *p; 974 { 975 976 return (0); 977 } 978 979 /* 980 * Do operations associated with quotas, not supported 981 */ 982 /* ARGSUSED */ 983 int 984 nfs_quotactl(mp, cmd, uid, arg, p) 985 struct mount *mp; 986 int cmd; 987 uid_t uid; 988 caddr_t arg; 989 struct proc *p; 990 { 991 992 return (EOPNOTSUPP); 993 } 994
Indexes created Wed Sep 24 05:09:52 GMT 2025