nfs_vfsops.c revision 1.111
1 /* $NetBSD: nfs_vfsops.c,v 1.111 2001/11/10 10:59:10 lukem 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/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.111 2001/11/10 10:59:10 lukem Exp $"); 43 44 #if defined(_KERNEL_OPT) 45 #include "opt_compat_netbsd.h" 46 #include "opt_nfs.h" 47 #endif 48 49 #include <sys/param.h> 50 #include <sys/ioctl.h> 51 #include <sys/signal.h> 52 #include <sys/proc.h> 53 #include <sys/namei.h> 54 #include <sys/device.h> 55 #include <sys/vnode.h> 56 #include <sys/kernel.h> 57 #include <sys/mount.h> 58 #include <sys/buf.h> 59 #include <sys/mbuf.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sysctl.h> 63 #include <sys/systm.h> 64 65 #include <net/if.h> 66 #include <net/route.h> 67 #include <netinet/in.h> 68 69 #include <nfs/rpcv2.h> 70 #include <nfs/nfsproto.h> 71 #include <nfs/nfsnode.h> 72 #include <nfs/nfs.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/xdr_subs.h> 75 #include <nfs/nfsm_subs.h> 76 #include <nfs/nfsdiskless.h> 77 #include <nfs/nqnfs.h> 78 #include <nfs/nfs_var.h> 79 80 extern struct nfsstats nfsstats; 81 extern int nfs_ticks; 82 83 int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 84 struct proc *)); 85 86 /* 87 * nfs vfs operations. 88 */ 89 90 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 91 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 92 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 93 94 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 95 &nfsv2_vnodeop_opv_desc, 96 &spec_nfsv2nodeop_opv_desc, 97 &fifo_nfsv2nodeop_opv_desc, 98 NULL, 99 }; 100 101 struct vfsops nfs_vfsops = { 102 MOUNT_NFS, 103 nfs_mount, 104 nfs_start, 105 nfs_unmount, 106 nfs_root, 107 nfs_quotactl, 108 nfs_statfs, 109 nfs_sync, 110 nfs_vget, 111 nfs_fhtovp, 112 nfs_vptofh, 113 nfs_vfs_init, 114 nfs_vfs_reinit, 115 nfs_vfs_done, 116 nfs_sysctl, 117 nfs_mountroot, 118 nfs_checkexp, 119 nfs_vnodeopv_descs, 120 }; 121 122 extern u_int32_t nfs_procids[NFS_NPROCS]; 123 extern u_int32_t nfs_prog, nfs_vers; 124 125 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 126 struct mount **, struct vnode **, struct proc *)); 127 128 #define TRUE 1 129 #define FALSE 0 130 131 /* 132 * nfs statfs call 133 */ 134 int 135 nfs_statfs(mp, sbp, p) 136 struct mount *mp; 137 struct statfs *sbp; 138 struct proc *p; 139 { 140 struct vnode *vp; 141 struct nfs_statfs *sfp; 142 caddr_t cp; 143 u_int32_t *tl; 144 int32_t t1, t2; 145 caddr_t bpos, dpos, cp2; 146 struct nfsmount *nmp = VFSTONFS(mp); 147 int error = 0, retattr; 148 #ifdef NFS_V2_ONLY 149 const int v3 = 0; 150 #else 151 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 152 #endif 153 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2; 154 struct ucred *cred; 155 u_quad_t tquad; 156 157 #ifndef nolint 158 sfp = (struct nfs_statfs *)0; 159 #endif 160 vp = nmp->nm_vnode; 161 cred = crget(); 162 cred->cr_ngroups = 0; 163 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 164 (void)nfs_fsinfo(nmp, vp, cred, p); 165 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 166 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 167 nfsm_fhtom(vp, v3); 168 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 169 if (v3) 170 nfsm_postop_attr(vp, retattr); 171 if (error) { 172 if (mrep != NULL) 173 m_free(mrep); 174 goto nfsmout; 175 } 176 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 177 #ifdef COMPAT_09 178 sbp->f_type = 2; 179 #else 180 sbp->f_type = 0; 181 #endif 182 sbp->f_flags = nmp->nm_flag; 183 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 184 if (v3) { 185 sbp->f_bsize = NFS_FABLKSIZE; 186 tquad = fxdr_hyper(&sfp->sf_tbytes); 187 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 188 tquad = fxdr_hyper(&sfp->sf_fbytes); 189 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 190 tquad = fxdr_hyper(&sfp->sf_abytes); 191 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 192 tquad = fxdr_hyper(&sfp->sf_tfiles); 193 sbp->f_files = (long)tquad; 194 tquad = fxdr_hyper(&sfp->sf_ffiles); 195 sbp->f_ffree = (long)tquad; 196 } else { 197 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 198 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 199 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 200 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 201 sbp->f_files = 0; 202 sbp->f_ffree = 0; 203 } 204 if (sbp != &mp->mnt_stat) { 205 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 206 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 207 } 208 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 209 nfsm_reqdone; 210 crfree(cred); 211 return (error); 212 } 213 214 #ifndef NFS_V2_ONLY 215 /* 216 * nfs version 3 fsinfo rpc call 217 */ 218 int 219 nfs_fsinfo(nmp, vp, cred, p) 220 struct nfsmount *nmp; 221 struct vnode *vp; 222 struct ucred *cred; 223 struct proc *p; 224 { 225 struct nfsv3_fsinfo *fsp; 226 caddr_t cp; 227 int32_t t1, t2; 228 u_int32_t *tl, pref, max; 229 caddr_t bpos, dpos, cp2; 230 int error = 0, retattr; 231 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 232 u_int64_t maxfsize; 233 234 nfsstats.rpccnt[NFSPROC_FSINFO]++; 235 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 236 nfsm_fhtom(vp, 1); 237 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 238 nfsm_postop_attr(vp, retattr); 239 if (!error) { 240 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 241 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 242 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 243 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 244 ~(NFS_FABLKSIZE - 1); 245 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 246 if (max < nmp->nm_wsize && max > 0) { 247 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 248 if (nmp->nm_wsize == 0) 249 nmp->nm_wsize = max; 250 } 251 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 252 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 253 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 254 ~(NFS_FABLKSIZE - 1); 255 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 256 if (max < nmp->nm_rsize && max > 0) { 257 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 258 if (nmp->nm_rsize == 0) 259 nmp->nm_rsize = max; 260 } 261 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 262 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 263 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 264 ~(NFS_DIRFRAGSIZ - 1); 265 if (max < nmp->nm_readdirsize && max > 0) { 266 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 267 if (nmp->nm_readdirsize == 0) 268 nmp->nm_readdirsize = max; 269 } 270 /* XXX */ 271 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 272 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 273 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 274 nmp->nm_maxfilesize = maxfsize; 275 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 276 } 277 nfsm_reqdone; 278 return (error); 279 } 280 #endif 281 282 /* 283 * Mount a remote root fs via. NFS. It goes like this: 284 * - Call nfs_boot_init() to fill in the nfs_diskless struct 285 * - build the rootfs mount point and call mountnfs() to do the rest. 286 */ 287 int 288 nfs_mountroot() 289 { 290 struct nfs_diskless *nd; 291 struct vattr attr; 292 struct mount *mp; 293 struct vnode *vp; 294 struct proc *procp; 295 long n; 296 int error; 297 298 procp = curproc; /* XXX */ 299 300 if (root_device->dv_class != DV_IFNET) 301 return (ENODEV); 302 303 /* 304 * XXX time must be non-zero when we init the interface or else 305 * the arp code will wedge. [Fixed now in if_ether.c] 306 * However, the NFS attribute cache gives false "hits" when 307 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 308 */ 309 if (time.tv_sec < NFS_MAXATTRTIMO) 310 time.tv_sec = NFS_MAXATTRTIMO; 311 312 /* 313 * Call nfs_boot_init() to fill in the nfs_diskless struct. 314 * Side effect: Finds and configures a network interface. 315 */ 316 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 317 memset((caddr_t)nd, 0, sizeof(*nd)); 318 error = nfs_boot_init(nd, procp); 319 if (error) { 320 free(nd, M_NFSMNT); 321 return (error); 322 } 323 324 /* 325 * Create the root mount point. 326 */ 327 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 328 if (error) 329 goto out; 330 printf("root on %s\n", nd->nd_root.ndm_host); 331 332 /* 333 * Link it into the mount list. 334 */ 335 simple_lock(&mountlist_slock); 336 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 337 simple_unlock(&mountlist_slock); 338 rootvp = vp; 339 mp->mnt_vnodecovered = NULLVP; 340 vfs_unbusy(mp); 341 342 /* Get root attributes (for the time). */ 343 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 344 if (error) 345 panic("nfs_mountroot: getattr for root"); 346 n = attr.va_atime.tv_sec; 347 #ifdef DEBUG 348 printf("root time: 0x%lx\n", n); 349 #endif 350 inittodr(n); 351 352 out: 353 if (error) 354 nfs_boot_cleanup(nd, procp); 355 free(nd, M_NFSMNT); 356 return (error); 357 } 358 359 /* 360 * Internal version of mount system call for diskless setup. 361 * Separate function because we used to call it twice. 362 * (once for root and once for swap) 363 */ 364 static int 365 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 366 struct nfs_dlmount *ndmntp; 367 const char *mntname; /* mount point name */ 368 struct mount **mpp; 369 struct vnode **vpp; 370 struct proc *p; 371 { 372 struct mount *mp; 373 struct mbuf *m; 374 int error; 375 376 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 377 378 mp->mnt_op = &nfs_vfsops; 379 380 /* 381 * Historical practice expects NFS root file systems to 382 * be initially mounted r/w. 383 */ 384 mp->mnt_flag &= ~MNT_RDONLY; 385 386 /* Get mbuf for server sockaddr. */ 387 m = m_get(M_WAIT, MT_SONAME); 388 if (m == NULL) 389 panic("nfs_mountroot: mget soname for %s", mntname); 390 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 391 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 392 393 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 394 ndmntp->ndm_args.hostname, vpp, p); 395 if (error) { 396 mp->mnt_op->vfs_refcount--; 397 vfs_unbusy(mp); 398 printf("nfs_mountroot: mount %s failed: %d\n", 399 mntname, error); 400 free(mp, M_MOUNT); 401 } else 402 *mpp = mp; 403 404 return (error); 405 } 406 407 void 408 nfs_decode_args(nmp, argp) 409 struct nfsmount *nmp; 410 struct nfs_args *argp; 411 { 412 int s; 413 int adjsock; 414 int maxio; 415 416 s = splsoftnet(); 417 418 /* 419 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 420 * no sense in that context. 421 */ 422 if (argp->sotype == SOCK_STREAM) 423 argp->flags &= ~NFSMNT_NOCONN; 424 425 /* 426 * Cookie translation is not needed for v2, silently ignore it. 427 */ 428 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 429 NFSMNT_XLATECOOKIE) 430 argp->flags &= ~NFSMNT_XLATECOOKIE; 431 432 /* Re-bind if rsrvd port requested and wasn't on one */ 433 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 434 && (argp->flags & NFSMNT_RESVPORT); 435 /* Also re-bind if we're switching to/from a connected UDP socket */ 436 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 437 (argp->flags & NFSMNT_NOCONN)); 438 439 /* Update flags. */ 440 nmp->nm_flag = argp->flags; 441 splx(s); 442 443 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 444 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 445 if (nmp->nm_timeo < NFS_MINTIMEO) 446 nmp->nm_timeo = NFS_MINTIMEO; 447 else if (nmp->nm_timeo > NFS_MAXTIMEO) 448 nmp->nm_timeo = NFS_MAXTIMEO; 449 } 450 451 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 452 nmp->nm_retry = argp->retrans; 453 if (nmp->nm_retry > NFS_MAXREXMIT) 454 nmp->nm_retry = NFS_MAXREXMIT; 455 } 456 457 #ifndef NFS_V2_ONLY 458 if (argp->flags & NFSMNT_NFSV3) { 459 if (argp->sotype == SOCK_DGRAM) 460 maxio = NFS_MAXDGRAMDATA; 461 else 462 maxio = NFS_MAXDATA; 463 } else 464 #endif 465 maxio = NFS_V2MAXDATA; 466 467 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 468 int osize = nmp->nm_wsize; 469 nmp->nm_wsize = argp->wsize; 470 /* Round down to multiple of blocksize */ 471 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 472 if (nmp->nm_wsize <= 0) 473 nmp->nm_wsize = NFS_FABLKSIZE; 474 adjsock |= (nmp->nm_wsize != osize); 475 } 476 if (nmp->nm_wsize > maxio) 477 nmp->nm_wsize = maxio; 478 if (nmp->nm_wsize > MAXBSIZE) 479 nmp->nm_wsize = MAXBSIZE; 480 481 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 482 int osize = nmp->nm_rsize; 483 nmp->nm_rsize = argp->rsize; 484 /* Round down to multiple of blocksize */ 485 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 486 if (nmp->nm_rsize <= 0) 487 nmp->nm_rsize = NFS_FABLKSIZE; 488 adjsock |= (nmp->nm_rsize != osize); 489 } 490 if (nmp->nm_rsize > maxio) 491 nmp->nm_rsize = maxio; 492 if (nmp->nm_rsize > MAXBSIZE) 493 nmp->nm_rsize = MAXBSIZE; 494 495 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 496 nmp->nm_readdirsize = argp->readdirsize; 497 /* Round down to multiple of minimum blocksize */ 498 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 499 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 500 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 501 /* Bigger than buffer size makes no sense */ 502 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 503 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 504 } else if (argp->flags & NFSMNT_RSIZE) 505 nmp->nm_readdirsize = nmp->nm_rsize; 506 507 if (nmp->nm_readdirsize > maxio) 508 nmp->nm_readdirsize = maxio; 509 510 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 511 argp->maxgrouplist <= NFS_MAXGRPS) 512 nmp->nm_numgrps = argp->maxgrouplist; 513 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 514 argp->readahead <= NFS_MAXRAHEAD) 515 nmp->nm_readahead = argp->readahead; 516 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 517 argp->leaseterm <= NQ_MAXLEASE) 518 nmp->nm_leaseterm = argp->leaseterm; 519 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 520 argp->deadthresh <= NQ_NEVERDEAD) 521 nmp->nm_deadthresh = argp->deadthresh; 522 523 adjsock |= ((nmp->nm_sotype != argp->sotype) || 524 (nmp->nm_soproto != argp->proto)); 525 nmp->nm_sotype = argp->sotype; 526 nmp->nm_soproto = argp->proto; 527 528 if (nmp->nm_so && adjsock) { 529 nfs_safedisconnect(nmp); 530 if (nmp->nm_sotype == SOCK_DGRAM) 531 while (nfs_connect(nmp, (struct nfsreq *)0)) { 532 printf("nfs_args: retrying connect\n"); 533 (void) tsleep((caddr_t)&lbolt, 534 PSOCK, "nfscn3", 0); 535 } 536 } 537 } 538 539 /* 540 * VFS Operations. 541 * 542 * mount system call 543 * It seems a bit dumb to copyinstr() the host and path here and then 544 * memcpy() them in mountnfs(), but I wanted to detect errors before 545 * doing the sockargs() call because sockargs() allocates an mbuf and 546 * an error after that means that I have to release the mbuf. 547 */ 548 /* ARGSUSED */ 549 int 550 nfs_mount(mp, path, data, ndp, p) 551 struct mount *mp; 552 const char *path; 553 void *data; 554 struct nameidata *ndp; 555 struct proc *p; 556 { 557 int error; 558 struct nfs_args args; 559 struct mbuf *nam; 560 struct vnode *vp; 561 char pth[MNAMELEN], hst[MNAMELEN]; 562 size_t len; 563 u_char nfh[NFSX_V3FHMAX]; 564 565 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 566 if (error) 567 return (error); 568 if (args.version != NFS_ARGSVERSION) 569 return (EPROGMISMATCH); 570 #ifdef NFS_V2_ONLY 571 if (args.flags & NFSMNT_NQNFS) 572 return (EPROGUNAVAIL); 573 if (args.flags & NFSMNT_NFSV3) 574 return (EPROGMISMATCH); 575 #endif 576 if (mp->mnt_flag & MNT_UPDATE) { 577 struct nfsmount *nmp = VFSTONFS(mp); 578 579 if (nmp == NULL) 580 return (EIO); 581 /* 582 * When doing an update, we can't change from or to 583 * v3 and/or nqnfs, or change cookie translation 584 */ 585 args.flags = (args.flags & 586 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 587 (nmp->nm_flag & 588 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 589 nfs_decode_args(nmp, &args); 590 return (0); 591 } 592 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 593 return (EINVAL); 594 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 595 if (error) 596 return (error); 597 error = copyinstr(path, pth, MNAMELEN-1, &len); 598 if (error) 599 return (error); 600 memset(&pth[len], 0, MNAMELEN - len); 601 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 602 if (error) 603 return (error); 604 memset(&hst[len], 0, MNAMELEN - len); 605 /* sockargs() call must be after above copyin() calls */ 606 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 607 if (error) 608 return (error); 609 args.fh = nfh; 610 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 611 return (error); 612 } 613 614 /* 615 * Common code for mount and mountroot 616 */ 617 int 618 mountnfs(argp, mp, nam, pth, hst, vpp, p) 619 struct nfs_args *argp; 620 struct mount *mp; 621 struct mbuf *nam; 622 const char *pth, *hst; 623 struct vnode **vpp; 624 struct proc *p; 625 { 626 struct nfsmount *nmp; 627 struct nfsnode *np; 628 int error; 629 struct vattr attrs; 630 struct ucred *cr; 631 632 /* 633 * If the number of nfs iothreads to use has never 634 * been set, create a reasonable number of them. 635 */ 636 637 if (nfs_niothreads < 0) { 638 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 639 nfs_getset_niothreads(TRUE); 640 } 641 642 if (mp->mnt_flag & MNT_UPDATE) { 643 nmp = VFSTONFS(mp); 644 /* update paths, file handles, etc, here XXX */ 645 m_freem(nam); 646 return (0); 647 } else { 648 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 649 M_NFSMNT, M_WAITOK); 650 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 651 mp->mnt_data = (qaddr_t)nmp; 652 TAILQ_INIT(&nmp->nm_uidlruhead); 653 TAILQ_INIT(&nmp->nm_bufq); 654 } 655 vfs_getnewfsid(mp); 656 nmp->nm_mountp = mp; 657 658 #ifndef NFS_V2_ONLY 659 if (argp->flags & NFSMNT_NQNFS) 660 /* 661 * We have to set mnt_maxsymlink to a non-zero value so 662 * that COMPAT_43 routines will know that we are setting 663 * the d_type field in directories (and can zero it for 664 * unsuspecting binaries). 665 */ 666 mp->mnt_maxsymlinklen = 1; 667 #endif 668 669 #ifndef NFS_V2_ONLY 670 if ((argp->flags & NFSMNT_NFSV3) == 0) 671 #endif 672 /* 673 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 674 * will fill this in. 675 */ 676 nmp->nm_maxfilesize = 0xffffffffLL; 677 678 nmp->nm_timeo = NFS_TIMEO; 679 nmp->nm_retry = NFS_RETRANS; 680 nmp->nm_wsize = NFS_WSIZE; 681 nmp->nm_rsize = NFS_RSIZE; 682 nmp->nm_readdirsize = NFS_READDIRSIZE; 683 nmp->nm_numgrps = NFS_MAXGRPS; 684 nmp->nm_readahead = NFS_DEFRAHEAD; 685 nmp->nm_leaseterm = NQ_DEFLEASE; 686 nmp->nm_deadthresh = NQ_DEADTHRESH; 687 CIRCLEQ_INIT(&nmp->nm_timerhead); 688 nmp->nm_inprog = NULLVP; 689 #ifdef COMPAT_09 690 mp->mnt_stat.f_type = 2; 691 #else 692 mp->mnt_stat.f_type = 0; 693 #endif 694 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, 695 MFSNAMELEN); 696 memcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 697 memcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 698 nmp->nm_nam = nam; 699 700 /* Set up the sockets and per-host congestion */ 701 nmp->nm_sotype = argp->sotype; 702 nmp->nm_soproto = argp->proto; 703 704 nfs_decode_args(nmp, argp); 705 706 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 707 mp->mnt_dev_bshift = DEV_BSHIFT; 708 709 /* 710 * For Connection based sockets (TCP,...) defer the connect until 711 * the first request, in case the server is not responding. 712 */ 713 if (nmp->nm_sotype == SOCK_DGRAM && 714 (error = nfs_connect(nmp, (struct nfsreq *)0))) 715 goto bad; 716 717 /* 718 * This is silly, but it has to be set so that vinifod() works. 719 * We do not want to do an nfs_statfs() here since we can get 720 * stuck on a dead server and we are holding a lock on the mount 721 * point. 722 */ 723 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 724 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 725 if (error) 726 goto bad; 727 *vpp = NFSTOV(np); 728 VOP_GETATTR(*vpp, &attrs, p->p_ucred, p); 729 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 730 cr = crget(); 731 cr->cr_uid = attrs.va_uid; 732 cr->cr_gid = attrs.va_gid; 733 cr->cr_ngroups = 0; 734 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 735 crfree(cr); 736 } 737 738 /* 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). So, just unlock, but no rele. 745 */ 746 747 nmp->nm_vnode = *vpp; 748 VOP_UNLOCK(*vpp, 0); 749 750 return (0); 751 bad: 752 nfs_disconnect(nmp); 753 free((caddr_t)nmp, M_NFSMNT); 754 m_freem(nam); 755 return (error); 756 } 757 758 /* 759 * unmount system call 760 */ 761 int 762 nfs_unmount(mp, mntflags, p) 763 struct mount *mp; 764 int mntflags; 765 struct proc *p; 766 { 767 struct nfsmount *nmp; 768 struct vnode *vp; 769 int error, flags = 0; 770 771 if (mntflags & MNT_FORCE) 772 flags |= FORCECLOSE; 773 nmp = VFSTONFS(mp); 774 /* 775 * Goes something like this.. 776 * - Check for activity on the root vnode (other than ourselves). 777 * - Call vflush() to clear out vnodes for this file system, 778 * except for the root vnode. 779 * - Decrement reference on the vnode representing remote root. 780 * - Close the socket 781 * - Free up the data structures 782 */ 783 /* 784 * We need to decrement the ref. count on the nfsnode representing 785 * the remote root. See comment in mountnfs(). The VFS unmount() 786 * has done vput on this vnode, otherwise we would get deadlock! 787 */ 788 vp = nmp->nm_vnode; 789 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 790 if (error != 0) 791 return error; 792 793 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 794 vput(vp); 795 return (EBUSY); 796 } 797 798 /* 799 * Must handshake with nqnfs_clientd() if it is active. 800 */ 801 nmp->nm_iflag |= NFSMNT_DISMINPROG; 802 while (nmp->nm_inprog != NULLVP) 803 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 804 error = vflush(mp, vp, flags); 805 if (error) { 806 vput(vp); 807 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 808 return (error); 809 } 810 811 /* 812 * We are now committed to the unmount; mark the mount structure 813 * as doomed so that any sleepers kicked awake by nfs_disconnect 814 * will go away cleanly. 815 */ 816 nmp->nm_iflag |= NFSMNT_DISMNT; 817 818 /* 819 * There are two reference counts to get rid of here 820 * (see comment in mountnfs()). 821 */ 822 vrele(vp); 823 vput(vp); 824 vgone(vp); 825 nfs_disconnect(nmp); 826 m_freem(nmp->nm_nam); 827 828 /* 829 * For NQNFS, let the server daemon free the nfsmount structure. 830 */ 831 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 832 free((caddr_t)nmp, M_NFSMNT); 833 return (0); 834 } 835 836 /* 837 * Return root of a filesystem 838 */ 839 int 840 nfs_root(mp, vpp) 841 struct mount *mp; 842 struct vnode **vpp; 843 { 844 struct vnode *vp; 845 struct nfsmount *nmp; 846 int error; 847 848 nmp = VFSTONFS(mp); 849 vp = nmp->nm_vnode; 850 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 851 if (error != 0) 852 return error; 853 if (vp->v_type == VNON) 854 vp->v_type = VDIR; 855 vp->v_flag = VROOT; 856 *vpp = vp; 857 return (0); 858 } 859 860 extern int syncprt; 861 862 /* 863 * Flush out the buffer cache 864 */ 865 /* ARGSUSED */ 866 int 867 nfs_sync(mp, waitfor, cred, p) 868 struct mount *mp; 869 int waitfor; 870 struct ucred *cred; 871 struct proc *p; 872 { 873 struct vnode *vp; 874 int error, allerror = 0; 875 876 /* 877 * Force stale buffer cache information to be flushed. 878 */ 879 loop: 880 for (vp = mp->mnt_vnodelist.lh_first; 881 vp != NULL; 882 vp = vp->v_mntvnodes.le_next) { 883 /* 884 * If the vnode that we are about to sync is no longer 885 * associated with this mount point, start over. 886 */ 887 if (vp->v_mount != mp) 888 goto loop; 889 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 890 (LIST_EMPTY(&vp->v_dirtyblkhd) && 891 vp->v_uobj.uo_npages == 0)) 892 continue; 893 if (vget(vp, LK_EXCLUSIVE)) 894 goto loop; 895 error = VOP_FSYNC(vp, cred, 896 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, 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 /* 920 * Do that sysctl thang... 921 */ 922 int 923 nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 924 int *name; 925 u_int namelen; 926 void *oldp; 927 size_t *oldlenp; 928 void *newp; 929 size_t newlen; 930 struct proc *p; 931 { 932 int rv; 933 934 /* 935 * All names at this level are terminal. 936 */ 937 if(namelen > 1) 938 return ENOTDIR; /* overloaded */ 939 940 switch(name[0]) { 941 case NFS_NFSSTATS: 942 if(!oldp) { 943 *oldlenp = sizeof nfsstats; 944 return 0; 945 } 946 947 if(*oldlenp < sizeof nfsstats) { 948 *oldlenp = sizeof nfsstats; 949 return ENOMEM; 950 } 951 952 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 953 if(rv) return rv; 954 955 if(newp && newlen != sizeof nfsstats) 956 return EINVAL; 957 958 if(newp) { 959 return copyin(newp, &nfsstats, sizeof nfsstats); 960 } 961 return 0; 962 963 case NFS_IOTHREADS: 964 nfs_getset_niothreads(0); 965 966 rv = (sysctl_int(oldp, oldlenp, newp, newlen, 967 &nfs_niothreads)); 968 969 if (newp) 970 nfs_getset_niothreads(1); 971 972 return rv; 973 974 default: 975 return EOPNOTSUPP; 976 } 977 } 978 979 980 /* 981 * At this point, this should never happen 982 */ 983 /* ARGSUSED */ 984 int 985 nfs_fhtovp(mp, fhp, vpp) 986 struct mount *mp; 987 struct fid *fhp; 988 struct vnode **vpp; 989 { 990 991 return (EINVAL); 992 } 993 994 /* ARGSUSED */ 995 int 996 nfs_checkexp(mp, nam, exflagsp, credanonp) 997 struct mount *mp; 998 struct mbuf *nam; 999 int *exflagsp; 1000 struct ucred **credanonp; 1001 { 1002 1003 return (EINVAL); 1004 } 1005 1006 /* 1007 * Vnode pointer to File handle, should never happen either 1008 */ 1009 /* ARGSUSED */ 1010 int 1011 nfs_vptofh(vp, fhp) 1012 struct vnode *vp; 1013 struct fid *fhp; 1014 { 1015 1016 return (EINVAL); 1017 } 1018 1019 /* 1020 * Vfs start routine, a no-op. 1021 */ 1022 /* ARGSUSED */ 1023 int 1024 nfs_start(mp, flags, p) 1025 struct mount *mp; 1026 int flags; 1027 struct proc *p; 1028 { 1029 1030 return (0); 1031 } 1032 1033 /* 1034 * Do operations associated with quotas, not supported 1035 */ 1036 /* ARGSUSED */ 1037 int 1038 nfs_quotactl(mp, cmd, uid, arg, p) 1039 struct mount *mp; 1040 int cmd; 1041 uid_t uid; 1042 caddr_t arg; 1043 struct proc *p; 1044 { 1045 1046 return (EOPNOTSUPP); 1047 } 1048
Indexes created Fri Sep 26 08:10:20 GMT 2025