nfs_vfsops.c revision 1.64
1 /* $NetBSD: nfs_vfsops.c,v 1.64 1997/09/09 21:39:19 gwr 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 int 106 nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 107 struct mount **, 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 u_int64_t maxfsize; 213 214 nfsstats.rpccnt[NFSPROC_FSINFO]++; 215 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 216 nfsm_fhtom(vp, 1); 217 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 218 nfsm_postop_attr(vp, retattr); 219 if (!error) { 220 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 221 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 222 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 223 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 224 ~(NFS_FABLKSIZE - 1); 225 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 226 if (max < nmp->nm_wsize && max > 0) { 227 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 228 if (nmp->nm_wsize == 0) 229 nmp->nm_wsize = max; 230 } 231 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 232 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 233 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 234 ~(NFS_FABLKSIZE - 1); 235 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 236 if (max < nmp->nm_rsize && max > 0) { 237 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 238 if (nmp->nm_rsize == 0) 239 nmp->nm_rsize = max; 240 } 241 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 242 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 243 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 244 ~(NFS_DIRBLKSIZ - 1); 245 if (max < nmp->nm_readdirsize && max > 0) { 246 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 247 if (nmp->nm_readdirsize == 0) 248 nmp->nm_readdirsize = max; 249 } 250 /* XXX */ 251 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 252 fxdr_hyper(&fsp->fs_maxfilesize, &maxfsize); 253 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 254 nmp->nm_maxfilesize = maxfsize; 255 nmp->nm_flag |= NFSMNT_GOTFSINFO; 256 } 257 nfsm_reqdone; 258 return (error); 259 } 260 261 /* 262 * Mount a remote root fs via. NFS. It goes like this: 263 * - Call nfs_boot_init() to fill in the nfs_diskless struct 264 * - build the rootfs mount point and call mountnfs() to do the rest. 265 */ 266 int 267 nfs_mountroot() 268 { 269 struct nfs_diskless *nd; 270 struct vattr attr; 271 struct mount *mp; 272 struct vnode *vp; 273 struct proc *procp; 274 long n; 275 int error; 276 277 procp = curproc; /* XXX */ 278 279 if (root_device->dv_class != DV_IFNET) 280 return (ENODEV); 281 282 /* 283 * XXX time must be non-zero when we init the interface or else 284 * the arp code will wedge. [Fixed now in if_ether.c] 285 * However, the NFS attribute cache gives false "hits" when 286 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 287 */ 288 if (time.tv_sec < NFS_MAXATTRTIMO) 289 time.tv_sec = NFS_MAXATTRTIMO; 290 291 /* 292 * Call nfs_boot_init() to fill in the nfs_diskless struct. 293 * Side effect: Finds and configures a network interface. 294 */ 295 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 296 bzero((caddr_t)nd, sizeof(*nd)); 297 error = nfs_boot_init(nd, procp); 298 if (error) 299 goto out; 300 301 /* 302 * Create the root mount point. 303 */ 304 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp); 305 if (error) 306 goto out; 307 printf("root on %s\n", nd->nd_root.ndm_host); 308 309 /* 310 * Link it into the mount list. 311 */ 312 #ifdef Lite2_integrated 313 simple_lock(&mountlist_slock); 314 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 315 simple_unlock(&mountlist_slock); 316 rootvp = vp; 317 vfs_unbusy(mp, procp); 318 #else 319 if (vfs_lock(mp)) 320 panic("nfs_mountroot: vfs_lock"); 321 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 322 mp->mnt_vnodecovered = NULLVP; 323 vfs_unlock(mp); 324 rootvp = vp; 325 #endif 326 327 /* Get root attributes (for the time). */ 328 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 329 if (error) 330 panic("nfs_mountroot: getattr for root"); 331 n = attr.va_mtime.tv_sec; 332 #ifdef DEBUG 333 printf("root time: 0x%lx\n", n); 334 #endif 335 inittodr(n); 336 337 #if 0 338 /* 339 * XXX splnet, so networks will receive... 340 * XXX Which port needed this hack? 341 * XXX Should already be at spl0. 342 */ 343 splnet(); 344 #endif 345 346 #if 0 /* swap now comes in from swapctl(2) */ 347 #ifdef notyet 348 /* Set up swap credentials. */ 349 proc0.p_ucred->cr_uid = 0; 350 proc0.p_ucred->cr_gid = 0; 351 proc0.p_ucred->cr_ngroups = 0; 352 #endif 353 354 /* 355 * "Mount" the swap device. 356 * 357 * On a "dataless" configuration (swap on disk) we will have: 358 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 359 */ 360 if (bdevvp(swapdev, &swapdev_vp)) 361 panic("nfs_mountroot: can't setup swap vp"); 362 if (swdevt[0].sw_dev != NODEV) { 363 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 364 error = 0; 365 goto out; 366 } 367 368 /* 369 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 370 * Create a fake mount point just for the swap vnode so that the 371 * swap file can be on a different server from the rootfs. 372 */ 373 error = nfs_mount_diskless(&nd->nd_swap, "/swap", &mp, &vp); 374 if (error) { 375 printf("nfs_boot: warning: mount(swap), error=%d\n", error); 376 error = 0; 377 goto out; 378 } 379 #ifdef Lite2_integrated 380 vfs_unbusy(mp, procp); 381 #endif 382 printf("swap on %s\n", nd->nd_swap.ndm_host); 383 384 /* 385 * Since the swap file is not the root dir of a file system, 386 * hack it to a regular file. 387 */ 388 vp->v_type = VREG; 389 vp->v_flag = 0; 390 swdevt[0].sw_vp = vp; 391 392 /* 393 * Find out how large the swap file is. 394 */ 395 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 396 if (error) 397 panic("nfs_mountroot: getattr for swap"); 398 n = (long) (attr.va_size >> DEV_BSHIFT); 399 #ifdef DEBUG 400 printf("swap size: 0x%lx (blocks)\n", n); 401 #endif 402 swdevt[0].sw_nblks = n; 403 #endif 404 405 out: 406 free(nd, M_NFSMNT); 407 return (error); 408 } 409 410 /* 411 * Internal version of mount system call for diskless setup. 412 * Separate function because we used to call it twice. 413 * (once for root and once for swap) 414 */ 415 static int 416 nfs_mount_diskless(ndmntp, mntname, mpp, vpp) 417 struct nfs_dlmount *ndmntp; 418 const char *mntname; /* mount point name */ 419 struct mount **mpp; 420 struct vnode **vpp; 421 { 422 struct mount *mp; 423 struct mbuf *m; 424 int error; 425 426 #ifdef Lite2_integrated 427 vfs_rootmountalloc("nfs", mntname, &mp); 428 #else 429 /* Create the mount point. */ 430 mp = (struct mount *)malloc((u_long)sizeof(struct mount), 431 M_MOUNT, M_WAITOK); 432 bzero((char *)mp, (u_long)sizeof(struct mount)); 433 #endif 434 mp->mnt_op = &nfs_vfsops; 435 /* mp->mnt_flag = 0 */ 436 437 /* Get mbuf for server sockaddr. */ 438 m = m_get(M_WAIT, MT_SONAME); 439 if (m == NULL) 440 panic("nfs_mountroot: mget soname for %s", mntname); 441 bcopy((caddr_t)ndmntp->ndm_args.addr, mtod(m, caddr_t), 442 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 443 444 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 445 ndmntp->ndm_args.hostname, vpp); 446 if (error) { 447 printf("nfs_mountroot: mount %s failed: %d\n", 448 mntname, error); 449 free(mp, M_MOUNT); 450 } else 451 *mpp = mp; 452 453 return (error); 454 } 455 456 void 457 nfs_decode_args(nmp, argp) 458 struct nfsmount *nmp; 459 struct nfs_args *argp; 460 { 461 int s; 462 int adjsock; 463 int maxio; 464 465 s = splsoftnet(); 466 467 /* 468 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 469 * no sense in that context. 470 */ 471 if (argp->sotype == SOCK_STREAM) 472 argp->flags &= ~NFSMNT_NOCONN; 473 474 /* Re-bind if rsrvd port requested and wasn't on one */ 475 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 476 && (argp->flags & NFSMNT_RESVPORT); 477 /* Also re-bind if we're switching to/from a connected UDP socket */ 478 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 479 (argp->flags & NFSMNT_NOCONN)); 480 481 /* Update flags atomically. Don't change the lock bits. */ 482 nmp->nm_flag = 483 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 484 splx(s); 485 486 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 487 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 488 if (nmp->nm_timeo < NFS_MINTIMEO) 489 nmp->nm_timeo = NFS_MINTIMEO; 490 else if (nmp->nm_timeo > NFS_MAXTIMEO) 491 nmp->nm_timeo = NFS_MAXTIMEO; 492 } 493 494 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 495 nmp->nm_retry = argp->retrans; 496 if (nmp->nm_retry > NFS_MAXREXMIT) 497 nmp->nm_retry = NFS_MAXREXMIT; 498 } 499 500 if (argp->flags & NFSMNT_NFSV3) { 501 if (argp->sotype == SOCK_DGRAM) 502 maxio = NFS_MAXDGRAMDATA; 503 else 504 maxio = NFS_MAXDATA; 505 } else 506 maxio = NFS_V2MAXDATA; 507 508 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 509 int osize = nmp->nm_wsize; 510 nmp->nm_wsize = argp->wsize; 511 /* Round down to multiple of blocksize */ 512 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 513 if (nmp->nm_wsize <= 0) 514 nmp->nm_wsize = NFS_FABLKSIZE; 515 adjsock |= (nmp->nm_wsize != osize); 516 } 517 if (nmp->nm_wsize > maxio) 518 nmp->nm_wsize = maxio; 519 if (nmp->nm_wsize > MAXBSIZE) 520 nmp->nm_wsize = MAXBSIZE; 521 522 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 523 int osize = nmp->nm_rsize; 524 nmp->nm_rsize = argp->rsize; 525 /* Round down to multiple of blocksize */ 526 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 527 if (nmp->nm_rsize <= 0) 528 nmp->nm_rsize = NFS_FABLKSIZE; 529 adjsock |= (nmp->nm_rsize != osize); 530 } 531 if (nmp->nm_rsize > maxio) 532 nmp->nm_rsize = maxio; 533 if (nmp->nm_rsize > MAXBSIZE) 534 nmp->nm_rsize = MAXBSIZE; 535 536 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 537 nmp->nm_readdirsize = argp->readdirsize; 538 /* Round down to multiple of blocksize */ 539 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 540 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 541 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 542 } else if (argp->flags & NFSMNT_RSIZE) 543 nmp->nm_readdirsize = nmp->nm_rsize; 544 545 if (nmp->nm_readdirsize > maxio) 546 nmp->nm_readdirsize = maxio; 547 548 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 549 argp->maxgrouplist <= NFS_MAXGRPS) 550 nmp->nm_numgrps = argp->maxgrouplist; 551 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 552 argp->readahead <= NFS_MAXRAHEAD) 553 nmp->nm_readahead = argp->readahead; 554 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 555 argp->leaseterm <= NQ_MAXLEASE) 556 nmp->nm_leaseterm = argp->leaseterm; 557 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 558 argp->deadthresh <= NQ_NEVERDEAD) 559 nmp->nm_deadthresh = argp->deadthresh; 560 561 adjsock |= ((nmp->nm_sotype != argp->sotype) || 562 (nmp->nm_soproto != argp->proto)); 563 nmp->nm_sotype = argp->sotype; 564 nmp->nm_soproto = argp->proto; 565 566 if (nmp->nm_so && adjsock) { 567 nfs_disconnect(nmp); 568 if (nmp->nm_sotype == SOCK_DGRAM) 569 while (nfs_connect(nmp, (struct nfsreq *)0)) { 570 printf("nfs_args: retrying connect\n"); 571 (void) tsleep((caddr_t)&lbolt, 572 PSOCK, "nfscon", 0); 573 } 574 } 575 } 576 577 /* 578 * VFS Operations. 579 * 580 * mount system call 581 * It seems a bit dumb to copyinstr() the host and path here and then 582 * bcopy() them in mountnfs(), but I wanted to detect errors before 583 * doing the sockargs() call because sockargs() allocates an mbuf and 584 * an error after that means that I have to release the mbuf. 585 */ 586 /* ARGSUSED */ 587 int 588 nfs_mount(mp, path, data, ndp, p) 589 struct mount *mp; 590 const char *path; 591 void *data; 592 struct nameidata *ndp; 593 struct proc *p; 594 { 595 int error; 596 struct nfs_args args; 597 struct mbuf *nam; 598 struct vnode *vp; 599 char pth[MNAMELEN], hst[MNAMELEN]; 600 size_t len; 601 u_char nfh[NFSX_V3FHMAX]; 602 603 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 604 if (error) 605 return (error); 606 if (args.version != NFS_ARGSVERSION) 607 return (EPROGMISMATCH); 608 if (mp->mnt_flag & MNT_UPDATE) { 609 register struct nfsmount *nmp = VFSTONFS(mp); 610 611 if (nmp == NULL) 612 return (EIO); 613 /* 614 * When doing an update, we can't change from or to 615 * v3 and/or nqnfs. 616 */ 617 args.flags = (args.flags & ~(NFSMNT_NFSV3|NFSMNT_NQNFS)) | 618 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_NQNFS)); 619 nfs_decode_args(nmp, &args); 620 return (0); 621 } 622 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 623 if (error) 624 return (error); 625 error = copyinstr(path, pth, MNAMELEN-1, &len); 626 if (error) 627 return (error); 628 bzero(&pth[len], MNAMELEN - len); 629 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 630 if (error) 631 return (error); 632 bzero(&hst[len], MNAMELEN - len); 633 /* sockargs() call must be after above copyin() calls */ 634 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 635 if (error) 636 return (error); 637 args.fh = nfh; 638 error = mountnfs(&args, mp, nam, pth, hst, &vp); 639 return (error); 640 } 641 642 /* 643 * Common code for mount and mountroot 644 */ 645 int 646 mountnfs(argp, mp, nam, pth, hst, vpp) 647 register struct nfs_args *argp; 648 register struct mount *mp; 649 struct mbuf *nam; 650 const char *pth, *hst; 651 struct vnode **vpp; 652 { 653 register struct nfsmount *nmp; 654 struct nfsnode *np; 655 int error; 656 struct vattr attrs; 657 658 if (mp->mnt_flag & MNT_UPDATE) { 659 nmp = VFSTONFS(mp); 660 /* update paths, file handles, etc, here XXX */ 661 m_freem(nam); 662 return (0); 663 } else { 664 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 665 M_NFSMNT, M_WAITOK); 666 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 667 mp->mnt_data = (qaddr_t)nmp; 668 TAILQ_INIT(&nmp->nm_uidlruhead); 669 TAILQ_INIT(&nmp->nm_bufq); 670 } 671 #ifdef Lite2_integrated 672 vfs_getnewfsid(mp, makefstype(MOUNT_NFS)); 673 #else 674 getnewfsid(mp, makefstype(MOUNT_NFS)); 675 #endif 676 nmp->nm_mountp = mp; 677 678 if (argp->flags & NFSMNT_NQNFS) 679 /* 680 * We have to set mnt_maxsymlink to a non-zero value so 681 * that COMPAT_43 routines will know that we are setting 682 * the d_type field in directories (and can zero it for 683 * unsuspecting binaries). 684 */ 685 mp->mnt_maxsymlinklen = 1; 686 687 if ((argp->flags & NFSMNT_NFSV3) == 0) 688 /* 689 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 690 * will fill this in. 691 */ 692 nmp->nm_maxfilesize = 0xffffffffLL; 693 694 nmp->nm_timeo = NFS_TIMEO; 695 nmp->nm_retry = NFS_RETRANS; 696 nmp->nm_wsize = NFS_WSIZE; 697 nmp->nm_rsize = NFS_RSIZE; 698 nmp->nm_readdirsize = NFS_READDIRSIZE; 699 nmp->nm_numgrps = NFS_MAXGRPS; 700 nmp->nm_readahead = NFS_DEFRAHEAD; 701 nmp->nm_leaseterm = NQ_DEFLEASE; 702 nmp->nm_deadthresh = NQ_DEADTHRESH; 703 CIRCLEQ_INIT(&nmp->nm_timerhead); 704 nmp->nm_inprog = NULLVP; 705 nmp->nm_fhsize = argp->fhsize; 706 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 707 #ifdef COMPAT_09 708 mp->mnt_stat.f_type = 2; 709 #else 710 mp->mnt_stat.f_type = 0; 711 #endif 712 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 713 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 714 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 715 nmp->nm_nam = nam; 716 717 /* Set up the sockets and per-host congestion */ 718 nmp->nm_sotype = argp->sotype; 719 nmp->nm_soproto = argp->proto; 720 721 nfs_decode_args(nmp, argp); 722 723 /* 724 * For Connection based sockets (TCP,...) defer the connect until 725 * the first request, in case the server is not responding. 726 */ 727 if (nmp->nm_sotype == SOCK_DGRAM && 728 (error = nfs_connect(nmp, (struct nfsreq *)0))) 729 goto bad; 730 731 /* 732 * This is silly, but it has to be set so that vinifod() works. 733 * We do not want to do an nfs_statfs() here since we can get 734 * stuck on a dead server and we are holding a lock on the mount 735 * point. 736 */ 737 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 738 /* 739 * A reference count is needed on the nfsnode representing the 740 * remote root. If this object is not persistent, then backward 741 * traversals of the mount point (i.e. "..") will not work if 742 * the nfsnode gets flushed out of the cache. Ufs does not have 743 * this problem, because one can identify root inodes by their 744 * number == ROOTINO (2). 745 */ 746 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 747 if (error) 748 goto bad; 749 *vpp = NFSTOV(np); 750 VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc); /* XXX */ 751 752 return (0); 753 bad: 754 nfs_disconnect(nmp); 755 free((caddr_t)nmp, M_NFSMNT); 756 m_freem(nam); 757 return (error); 758 } 759 760 /* 761 * unmount system call 762 */ 763 int 764 nfs_unmount(mp, mntflags, p) 765 struct mount *mp; 766 int mntflags; 767 struct proc *p; 768 { 769 register struct nfsmount *nmp; 770 struct nfsnode *np; 771 struct vnode *vp; 772 int error, flags = 0; 773 774 if (mntflags & MNT_FORCE) 775 flags |= FORCECLOSE; 776 nmp = VFSTONFS(mp); 777 /* 778 * Goes something like this.. 779 * - Check for activity on the root vnode (other than ourselves). 780 * - Call vflush() to clear out vnodes for this file system, 781 * except for the root vnode. 782 * - Decrement reference on the vnode representing remote root. 783 * - Close the socket 784 * - Free up the data structures 785 */ 786 /* 787 * We need to decrement the ref. count on the nfsnode representing 788 * the remote root. See comment in mountnfs(). The VFS unmount() 789 * has done vput on this vnode, otherwise we would get deadlock! 790 */ 791 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 792 if (error) 793 return(error); 794 vp = NFSTOV(np); 795 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 796 vput(vp); 797 return (EBUSY); 798 } 799 800 /* 801 * Must handshake with nqnfs_clientd() if it is active. 802 */ 803 nmp->nm_flag |= NFSMNT_DISMINPROG; 804 while (nmp->nm_inprog != NULLVP) 805 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 806 error = vflush(mp, vp, flags); 807 if (error) { 808 vput(vp); 809 nmp->nm_flag &= ~NFSMNT_DISMINPROG; 810 return (error); 811 } 812 813 /* 814 * We are now committed to the unmount. 815 * For NQNFS, let the server daemon free the nfsmount structure. 816 */ 817 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 818 nmp->nm_flag |= NFSMNT_DISMNT; 819 820 /* 821 * There are two reference counts to get rid of here. 822 */ 823 vrele(vp); 824 vrele(vp); 825 vgone(vp); 826 nfs_disconnect(nmp); 827 m_freem(nmp->nm_nam); 828 829 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 830 free((caddr_t)nmp, M_NFSMNT); 831 return (0); 832 } 833 834 /* 835 * Return root of a filesystem 836 */ 837 int 838 nfs_root(mp, vpp) 839 struct mount *mp; 840 struct vnode **vpp; 841 { 842 register struct vnode *vp; 843 struct nfsmount *nmp; 844 struct nfsnode *np; 845 int error; 846 847 nmp = VFSTONFS(mp); 848 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 849 if (error) 850 return (error); 851 vp = NFSTOV(np); 852 if (vp->v_type == VNON) 853 vp->v_type = VDIR; 854 vp->v_flag = VROOT; 855 *vpp = vp; 856 return (0); 857 } 858 859 extern int syncprt; 860 861 /* 862 * Flush out the buffer cache 863 */ 864 /* ARGSUSED */ 865 int 866 nfs_sync(mp, waitfor, cred, p) 867 struct mount *mp; 868 int waitfor; 869 struct ucred *cred; 870 struct proc *p; 871 { 872 register struct vnode *vp; 873 int error, allerror = 0; 874 875 /* 876 * Force stale buffer cache information to be flushed. 877 */ 878 loop: 879 for (vp = mp->mnt_vnodelist.lh_first; 880 vp != NULL; 881 vp = vp->v_mntvnodes.le_next) { 882 /* 883 * If the vnode that we are about to sync is no longer 884 * associated with this mount point, start over. 885 */ 886 if (vp->v_mount != mp) 887 goto loop; 888 if (VOP_ISLOCKED(vp) || vp->v_dirtyblkhd.lh_first == NULL) 889 continue; 890 #ifdef Lite2_integrated 891 if (vget(vp, LK_EXCLUSIVE, p)) 892 #else 893 if (vget(vp, 1)) 894 #endif 895 goto loop; 896 error = VOP_FSYNC(vp, cred, waitfor, p); 897 if (error) 898 allerror = error; 899 vput(vp); 900 } 901 return (allerror); 902 } 903 904 /* 905 * NFS flat namespace lookup. 906 * Currently unsupported. 907 */ 908 /* ARGSUSED */ 909 int 910 nfs_vget(mp, ino, vpp) 911 struct mount *mp; 912 ino_t ino; 913 struct vnode **vpp; 914 { 915 916 return (EOPNOTSUPP); 917 } 918 919 #ifdef notyet 920 /* 921 * Do that sysctl thang... 922 */ 923 static int 924 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 925 size_t newlen, struct proc *p) 926 { 927 int rv; 928 929 /* 930 * All names at this level are terminal. 931 */ 932 if(namelen > 1) 933 return ENOTDIR; /* overloaded */ 934 935 switch(name[0]) { 936 case NFS_NFSSTATS: 937 if(!oldp) { 938 *oldlenp = sizeof nfsstats; 939 return 0; 940 } 941 942 if(*oldlenp < sizeof nfsstats) { 943 *oldlenp = sizeof nfsstats; 944 return ENOMEM; 945 } 946 947 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 948 if(rv) return rv; 949 950 if(newp && newlen != sizeof nfsstats) 951 return EINVAL; 952 953 if(newp) { 954 return copyin(newp, &nfsstats, sizeof nfsstats); 955 } 956 return 0; 957 958 default: 959 return EOPNOTSUPP; 960 } 961 } 962 #endif 963 964 965 /* 966 * At this point, this should never happen 967 */ 968 /* ARGSUSED */ 969 int 970 nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp) 971 register struct mount *mp; 972 struct fid *fhp; 973 struct mbuf *nam; 974 struct vnode **vpp; 975 int *exflagsp; 976 struct ucred **credanonp; 977 { 978 979 return (EINVAL); 980 } 981 982 /* 983 * Vnode pointer to File handle, should never happen either 984 */ 985 /* ARGSUSED */ 986 int 987 nfs_vptofh(vp, fhp) 988 struct vnode *vp; 989 struct fid *fhp; 990 { 991 992 return (EINVAL); 993 } 994 995 /* 996 * Vfs start routine, a no-op. 997 */ 998 /* ARGSUSED */ 999 int 1000 nfs_start(mp, flags, p) 1001 struct mount *mp; 1002 int flags; 1003 struct proc *p; 1004 { 1005 1006 return (0); 1007 } 1008 1009 /* 1010 * Do operations associated with quotas, not supported 1011 */ 1012 /* ARGSUSED */ 1013 int 1014 nfs_quotactl(mp, cmd, uid, arg, p) 1015 struct mount *mp; 1016 int cmd; 1017 uid_t uid; 1018 caddr_t arg; 1019 struct proc *p; 1020 { 1021 1022 return (EOPNOTSUPP); 1023 } 1024
Indexes created Wed Oct 01 07:09:59 GMT 2025