nfs_vfsops.c revision 1.103
1 /* $NetBSD: nfs_vfsops.c,v 1.103 2001/05/30 11:42:14 mrg 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 #if defined(_KERNEL_OPT) 42 #include "opt_compat_netbsd.h" 43 #include "opt_nfs.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/ioctl.h> 48 #include <sys/signal.h> 49 #include <sys/proc.h> 50 #include <sys/namei.h> 51 #include <sys/device.h> 52 #include <sys/vnode.h> 53 #include <sys/kernel.h> 54 #include <sys/mount.h> 55 #include <sys/buf.h> 56 #include <sys/mbuf.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <nfs/rpcv2.h> 67 #include <nfs/nfsproto.h> 68 #include <nfs/nfsnode.h> 69 #include <nfs/nfs.h> 70 #include <nfs/nfsmount.h> 71 #include <nfs/xdr_subs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/nfsdiskless.h> 74 #include <nfs/nqnfs.h> 75 #include <nfs/nfs_var.h> 76 77 extern struct nfsstats nfsstats; 78 extern int nfs_ticks; 79 80 int nfs_sysctl __P((int *, u_int, void *, size_t *, void *, size_t, 81 struct proc *)); 82 83 /* 84 * nfs vfs operations. 85 */ 86 87 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 88 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 89 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 90 91 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 92 &nfsv2_vnodeop_opv_desc, 93 &spec_nfsv2nodeop_opv_desc, 94 &fifo_nfsv2nodeop_opv_desc, 95 NULL, 96 }; 97 98 struct vfsops nfs_vfsops = { 99 MOUNT_NFS, 100 nfs_mount, 101 nfs_start, 102 nfs_unmount, 103 nfs_root, 104 nfs_quotactl, 105 nfs_statfs, 106 nfs_sync, 107 nfs_vget, 108 nfs_fhtovp, 109 nfs_vptofh, 110 nfs_vfs_init, 111 nfs_vfs_done, 112 nfs_sysctl, 113 nfs_mountroot, 114 nfs_checkexp, 115 nfs_vnodeopv_descs, 116 }; 117 118 extern u_int32_t nfs_procids[NFS_NPROCS]; 119 extern u_int32_t nfs_prog, nfs_vers; 120 121 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 122 struct mount **, struct vnode **, struct proc *)); 123 124 #define TRUE 1 125 #define FALSE 0 126 127 /* 128 * nfs statfs call 129 */ 130 int 131 nfs_statfs(mp, sbp, p) 132 struct mount *mp; 133 struct statfs *sbp; 134 struct proc *p; 135 { 136 struct vnode *vp; 137 struct nfs_statfs *sfp; 138 caddr_t cp; 139 u_int32_t *tl; 140 int32_t t1, t2; 141 caddr_t bpos, dpos, cp2; 142 struct nfsmount *nmp = VFSTONFS(mp); 143 int error = 0, retattr; 144 #ifdef NFS_V2_ONLY 145 const int v3 = 0; 146 #else 147 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 148 #endif 149 struct mbuf *mreq, *mrep = NULL, *md, *mb, *mb2; 150 struct ucred *cred; 151 u_quad_t tquad; 152 153 #ifndef nolint 154 sfp = (struct nfs_statfs *)0; 155 #endif 156 vp = nmp->nm_vnode; 157 cred = crget(); 158 cred->cr_ngroups = 0; 159 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 160 (void)nfs_fsinfo(nmp, vp, cred, p); 161 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 162 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 163 nfsm_fhtom(vp, v3); 164 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 165 if (v3) 166 nfsm_postop_attr(vp, retattr); 167 if (error) { 168 if (mrep != NULL) 169 m_free(mrep); 170 goto nfsmout; 171 } 172 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 173 #ifdef COMPAT_09 174 sbp->f_type = 2; 175 #else 176 sbp->f_type = 0; 177 #endif 178 sbp->f_flags = nmp->nm_flag; 179 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 180 if (v3) { 181 sbp->f_bsize = NFS_FABLKSIZE; 182 tquad = fxdr_hyper(&sfp->sf_tbytes); 183 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 184 tquad = fxdr_hyper(&sfp->sf_fbytes); 185 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 186 tquad = fxdr_hyper(&sfp->sf_abytes); 187 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 188 tquad = fxdr_hyper(&sfp->sf_tfiles); 189 sbp->f_files = (long)tquad; 190 tquad = fxdr_hyper(&sfp->sf_ffiles); 191 sbp->f_ffree = (long)tquad; 192 } else { 193 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 194 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 195 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 196 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 197 sbp->f_files = 0; 198 sbp->f_ffree = 0; 199 } 200 if (sbp != &mp->mnt_stat) { 201 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 202 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 203 } 204 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 205 nfsm_reqdone; 206 crfree(cred); 207 return (error); 208 } 209 210 #ifndef NFS_V2_ONLY 211 /* 212 * nfs version 3 fsinfo rpc call 213 */ 214 int 215 nfs_fsinfo(nmp, vp, cred, p) 216 struct nfsmount *nmp; 217 struct vnode *vp; 218 struct ucred *cred; 219 struct proc *p; 220 { 221 struct nfsv3_fsinfo *fsp; 222 caddr_t cp; 223 int32_t t1, t2; 224 u_int32_t *tl, pref, max; 225 caddr_t bpos, dpos, cp2; 226 int error = 0, retattr; 227 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 228 u_int64_t maxfsize; 229 230 nfsstats.rpccnt[NFSPROC_FSINFO]++; 231 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 232 nfsm_fhtom(vp, 1); 233 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 234 nfsm_postop_attr(vp, retattr); 235 if (!error) { 236 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 237 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 238 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 239 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 240 ~(NFS_FABLKSIZE - 1); 241 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 242 if (max < nmp->nm_wsize && max > 0) { 243 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 244 if (nmp->nm_wsize == 0) 245 nmp->nm_wsize = max; 246 } 247 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 248 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 249 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 250 ~(NFS_FABLKSIZE - 1); 251 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 252 if (max < nmp->nm_rsize && max > 0) { 253 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 254 if (nmp->nm_rsize == 0) 255 nmp->nm_rsize = max; 256 } 257 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 258 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 259 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 260 ~(NFS_DIRFRAGSIZ - 1); 261 if (max < nmp->nm_readdirsize && max > 0) { 262 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 263 if (nmp->nm_readdirsize == 0) 264 nmp->nm_readdirsize = max; 265 } 266 /* XXX */ 267 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 268 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 269 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 270 nmp->nm_maxfilesize = maxfsize; 271 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 272 } 273 nfsm_reqdone; 274 return (error); 275 } 276 #endif 277 278 /* 279 * Mount a remote root fs via. NFS. It goes like this: 280 * - Call nfs_boot_init() to fill in the nfs_diskless struct 281 * - build the rootfs mount point and call mountnfs() to do the rest. 282 */ 283 int 284 nfs_mountroot() 285 { 286 struct nfs_diskless *nd; 287 struct vattr attr; 288 struct mount *mp; 289 struct vnode *vp; 290 struct proc *procp; 291 long n; 292 int error; 293 294 procp = curproc; /* XXX */ 295 296 if (root_device->dv_class != DV_IFNET) 297 return (ENODEV); 298 299 /* 300 * XXX time must be non-zero when we init the interface or else 301 * the arp code will wedge. [Fixed now in if_ether.c] 302 * However, the NFS attribute cache gives false "hits" when 303 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 304 */ 305 if (time.tv_sec < NFS_MAXATTRTIMO) 306 time.tv_sec = NFS_MAXATTRTIMO; 307 308 /* 309 * Call nfs_boot_init() to fill in the nfs_diskless struct. 310 * Side effect: Finds and configures a network interface. 311 */ 312 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 313 memset((caddr_t)nd, 0, sizeof(*nd)); 314 error = nfs_boot_init(nd, procp); 315 if (error) { 316 free(nd, M_NFSMNT); 317 return (error); 318 } 319 320 /* 321 * Create the root mount point. 322 */ 323 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 324 if (error) 325 goto out; 326 printf("root on %s\n", nd->nd_root.ndm_host); 327 328 /* 329 * Link it into the mount list. 330 */ 331 simple_lock(&mountlist_slock); 332 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 333 simple_unlock(&mountlist_slock); 334 rootvp = vp; 335 mp->mnt_vnodecovered = NULLVP; 336 vfs_unbusy(mp); 337 338 /* Get root attributes (for the time). */ 339 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 340 if (error) 341 panic("nfs_mountroot: getattr for root"); 342 n = attr.va_atime.tv_sec; 343 #ifdef DEBUG 344 printf("root time: 0x%lx\n", n); 345 #endif 346 inittodr(n); 347 348 out: 349 if (error) 350 nfs_boot_cleanup(nd, procp); 351 free(nd, M_NFSMNT); 352 return (error); 353 } 354 355 /* 356 * Internal version of mount system call for diskless setup. 357 * Separate function because we used to call it twice. 358 * (once for root and once for swap) 359 */ 360 static int 361 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 362 struct nfs_dlmount *ndmntp; 363 const char *mntname; /* mount point name */ 364 struct mount **mpp; 365 struct vnode **vpp; 366 struct proc *p; 367 { 368 struct mount *mp; 369 struct mbuf *m; 370 int error; 371 372 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 373 374 mp->mnt_op = &nfs_vfsops; 375 376 /* 377 * Historical practice expects NFS root file systems to 378 * be initially mounted r/w. 379 */ 380 mp->mnt_flag &= ~MNT_RDONLY; 381 382 /* Get mbuf for server sockaddr. */ 383 m = m_get(M_WAIT, MT_SONAME); 384 if (m == NULL) 385 panic("nfs_mountroot: mget soname for %s", mntname); 386 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 387 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 388 389 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 390 ndmntp->ndm_args.hostname, vpp, p); 391 if (error) { 392 mp->mnt_op->vfs_refcount--; 393 vfs_unbusy(mp); 394 printf("nfs_mountroot: mount %s failed: %d\n", 395 mntname, error); 396 free(mp, M_MOUNT); 397 } else 398 *mpp = mp; 399 400 return (error); 401 } 402 403 void 404 nfs_decode_args(nmp, argp) 405 struct nfsmount *nmp; 406 struct nfs_args *argp; 407 { 408 int s; 409 int adjsock; 410 int maxio; 411 412 s = splsoftnet(); 413 414 /* 415 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 416 * no sense in that context. 417 */ 418 if (argp->sotype == SOCK_STREAM) 419 argp->flags &= ~NFSMNT_NOCONN; 420 421 /* 422 * Cookie translation is not needed for v2, silently ignore it. 423 */ 424 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 425 NFSMNT_XLATECOOKIE) 426 argp->flags &= ~NFSMNT_XLATECOOKIE; 427 428 /* Re-bind if rsrvd port requested and wasn't on one */ 429 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 430 && (argp->flags & NFSMNT_RESVPORT); 431 /* Also re-bind if we're switching to/from a connected UDP socket */ 432 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 433 (argp->flags & NFSMNT_NOCONN)); 434 435 /* Update flags. */ 436 nmp->nm_flag = argp->flags; 437 splx(s); 438 439 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 440 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 441 if (nmp->nm_timeo < NFS_MINTIMEO) 442 nmp->nm_timeo = NFS_MINTIMEO; 443 else if (nmp->nm_timeo > NFS_MAXTIMEO) 444 nmp->nm_timeo = NFS_MAXTIMEO; 445 } 446 447 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 448 nmp->nm_retry = argp->retrans; 449 if (nmp->nm_retry > NFS_MAXREXMIT) 450 nmp->nm_retry = NFS_MAXREXMIT; 451 } 452 453 #ifndef NFS_V2_ONLY 454 if (argp->flags & NFSMNT_NFSV3) { 455 if (argp->sotype == SOCK_DGRAM) 456 maxio = NFS_MAXDGRAMDATA; 457 else 458 maxio = NFS_MAXDATA; 459 } else 460 #endif 461 maxio = NFS_V2MAXDATA; 462 463 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 464 int osize = nmp->nm_wsize; 465 nmp->nm_wsize = argp->wsize; 466 /* Round down to multiple of blocksize */ 467 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 468 if (nmp->nm_wsize <= 0) 469 nmp->nm_wsize = NFS_FABLKSIZE; 470 adjsock |= (nmp->nm_wsize != osize); 471 } 472 if (nmp->nm_wsize > maxio) 473 nmp->nm_wsize = maxio; 474 if (nmp->nm_wsize > MAXBSIZE) 475 nmp->nm_wsize = MAXBSIZE; 476 477 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 478 int osize = nmp->nm_rsize; 479 nmp->nm_rsize = argp->rsize; 480 /* Round down to multiple of blocksize */ 481 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 482 if (nmp->nm_rsize <= 0) 483 nmp->nm_rsize = NFS_FABLKSIZE; 484 adjsock |= (nmp->nm_rsize != osize); 485 } 486 if (nmp->nm_rsize > maxio) 487 nmp->nm_rsize = maxio; 488 if (nmp->nm_rsize > MAXBSIZE) 489 nmp->nm_rsize = MAXBSIZE; 490 491 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 492 nmp->nm_readdirsize = argp->readdirsize; 493 /* Round down to multiple of minimum blocksize */ 494 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 495 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 496 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 497 /* Bigger than buffer size makes no sense */ 498 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 499 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 500 } else if (argp->flags & NFSMNT_RSIZE) 501 nmp->nm_readdirsize = nmp->nm_rsize; 502 503 if (nmp->nm_readdirsize > maxio) 504 nmp->nm_readdirsize = maxio; 505 506 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 507 argp->maxgrouplist <= NFS_MAXGRPS) 508 nmp->nm_numgrps = argp->maxgrouplist; 509 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 510 argp->readahead <= NFS_MAXRAHEAD) 511 nmp->nm_readahead = argp->readahead; 512 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 513 argp->leaseterm <= NQ_MAXLEASE) 514 nmp->nm_leaseterm = argp->leaseterm; 515 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 516 argp->deadthresh <= NQ_NEVERDEAD) 517 nmp->nm_deadthresh = argp->deadthresh; 518 519 adjsock |= ((nmp->nm_sotype != argp->sotype) || 520 (nmp->nm_soproto != argp->proto)); 521 nmp->nm_sotype = argp->sotype; 522 nmp->nm_soproto = argp->proto; 523 524 if (nmp->nm_so && adjsock) { 525 nfs_safedisconnect(nmp); 526 if (nmp->nm_sotype == SOCK_DGRAM) 527 while (nfs_connect(nmp, (struct nfsreq *)0)) { 528 printf("nfs_args: retrying connect\n"); 529 (void) tsleep((caddr_t)&lbolt, 530 PSOCK, "nfscn3", 0); 531 } 532 } 533 } 534 535 /* 536 * VFS Operations. 537 * 538 * mount system call 539 * It seems a bit dumb to copyinstr() the host and path here and then 540 * memcpy() them in mountnfs(), but I wanted to detect errors before 541 * doing the sockargs() call because sockargs() allocates an mbuf and 542 * an error after that means that I have to release the mbuf. 543 */ 544 /* ARGSUSED */ 545 int 546 nfs_mount(mp, path, data, ndp, p) 547 struct mount *mp; 548 const char *path; 549 void *data; 550 struct nameidata *ndp; 551 struct proc *p; 552 { 553 int error; 554 struct nfs_args args; 555 struct mbuf *nam; 556 struct vnode *vp; 557 char pth[MNAMELEN], hst[MNAMELEN]; 558 size_t len; 559 u_char nfh[NFSX_V3FHMAX]; 560 561 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 562 if (error) 563 return (error); 564 if (args.version != NFS_ARGSVERSION) 565 return (EPROGMISMATCH); 566 #ifdef NFS_V2_ONLY 567 if (args.flags & NFSMNT_NQNFS) 568 return (EPROGUNAVAIL); 569 if (args.flags & NFSMNT_NFSV3) 570 return (EPROGMISMATCH); 571 #endif 572 if (mp->mnt_flag & MNT_UPDATE) { 573 struct nfsmount *nmp = VFSTONFS(mp); 574 575 if (nmp == NULL) 576 return (EIO); 577 /* 578 * When doing an update, we can't change from or to 579 * v3 and/or nqnfs, or change cookie translation 580 */ 581 args.flags = (args.flags & 582 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 583 (nmp->nm_flag & 584 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 585 nfs_decode_args(nmp, &args); 586 return (0); 587 } 588 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 589 if (error) 590 return (error); 591 error = copyinstr(path, pth, MNAMELEN-1, &len); 592 if (error) 593 return (error); 594 memset(&pth[len], 0, MNAMELEN - len); 595 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 596 if (error) 597 return (error); 598 memset(&hst[len], 0, MNAMELEN - len); 599 /* sockargs() call must be after above copyin() calls */ 600 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 601 if (error) 602 return (error); 603 args.fh = nfh; 604 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 605 return (error); 606 } 607 608 /* 609 * Common code for mount and mountroot 610 */ 611 int 612 mountnfs(argp, mp, nam, pth, hst, vpp, p) 613 struct nfs_args *argp; 614 struct mount *mp; 615 struct mbuf *nam; 616 const char *pth, *hst; 617 struct vnode **vpp; 618 struct proc *p; 619 { 620 struct nfsmount *nmp; 621 struct nfsnode *np; 622 int error; 623 struct vattr attrs; 624 struct ucred *cr; 625 626 /* 627 * If the number of nfs iothreads to use has never 628 * been set, create a reasonable number of them. 629 */ 630 631 if (nfs_niothreads < 0) { 632 nfs_niothreads = 4; 633 nfs_getset_niothreads(TRUE); 634 } 635 636 if (mp->mnt_flag & MNT_UPDATE) { 637 nmp = VFSTONFS(mp); 638 /* update paths, file handles, etc, here XXX */ 639 m_freem(nam); 640 return (0); 641 } else { 642 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 643 M_NFSMNT, M_WAITOK); 644 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 645 mp->mnt_data = (qaddr_t)nmp; 646 TAILQ_INIT(&nmp->nm_uidlruhead); 647 TAILQ_INIT(&nmp->nm_bufq); 648 } 649 vfs_getnewfsid(mp); 650 nmp->nm_mountp = mp; 651 652 #ifndef NFS_V2_ONLY 653 if (argp->flags & NFSMNT_NQNFS) 654 /* 655 * We have to set mnt_maxsymlink to a non-zero value so 656 * that COMPAT_43 routines will know that we are setting 657 * the d_type field in directories (and can zero it for 658 * unsuspecting binaries). 659 */ 660 mp->mnt_maxsymlinklen = 1; 661 #endif 662 663 #ifndef NFS_V2_ONLY 664 if ((argp->flags & NFSMNT_NFSV3) == 0) 665 #endif 666 /* 667 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 668 * will fill this in. 669 */ 670 nmp->nm_maxfilesize = 0xffffffffLL; 671 672 nmp->nm_timeo = NFS_TIMEO; 673 nmp->nm_retry = NFS_RETRANS; 674 nmp->nm_wsize = NFS_WSIZE; 675 nmp->nm_rsize = NFS_RSIZE; 676 nmp->nm_readdirsize = NFS_READDIRSIZE; 677 nmp->nm_numgrps = NFS_MAXGRPS; 678 nmp->nm_readahead = NFS_DEFRAHEAD; 679 nmp->nm_leaseterm = NQ_DEFLEASE; 680 nmp->nm_deadthresh = NQ_DEADTHRESH; 681 CIRCLEQ_INIT(&nmp->nm_timerhead); 682 nmp->nm_inprog = NULLVP; 683 #ifdef COMPAT_09 684 mp->mnt_stat.f_type = 2; 685 #else 686 mp->mnt_stat.f_type = 0; 687 #endif 688 mp->mnt_fs_bshift = DEV_BSHIFT; 689 mp->mnt_dev_bshift = -1; 690 strncpy(&mp->mnt_stat.f_fstypename[0], mp->mnt_op->vfs_name, 691 MFSNAMELEN); 692 memcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 693 memcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 694 nmp->nm_nam = nam; 695 696 /* Set up the sockets and per-host congestion */ 697 nmp->nm_sotype = argp->sotype; 698 nmp->nm_soproto = argp->proto; 699 700 nfs_decode_args(nmp, argp); 701 702 /* 703 * For Connection based sockets (TCP,...) defer the connect until 704 * the first request, in case the server is not responding. 705 */ 706 if (nmp->nm_sotype == SOCK_DGRAM && 707 (error = nfs_connect(nmp, (struct nfsreq *)0))) 708 goto bad; 709 710 /* 711 * This is silly, but it has to be set so that vinifod() works. 712 * We do not want to do an nfs_statfs() here since we can get 713 * stuck on a dead server and we are holding a lock on the mount 714 * point. 715 */ 716 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 717 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 718 if (error) 719 goto bad; 720 *vpp = NFSTOV(np); 721 VOP_GETATTR(*vpp, &attrs, p->p_ucred, p); 722 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 723 cr = crget(); 724 cr->cr_uid = attrs.va_uid; 725 cr->cr_gid = attrs.va_gid; 726 cr->cr_ngroups = 0; 727 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 728 crfree(cr); 729 } 730 731 /* 732 * A reference count is needed on the nfsnode representing the 733 * remote root. If this object is not persistent, then backward 734 * traversals of the mount point (i.e. "..") will not work if 735 * the nfsnode gets flushed out of the cache. Ufs does not have 736 * this problem, because one can identify root inodes by their 737 * number == ROOTINO (2). So, just unlock, but no rele. 738 */ 739 740 nmp->nm_vnode = *vpp; 741 VOP_UNLOCK(*vpp, 0); 742 743 return (0); 744 bad: 745 nfs_disconnect(nmp); 746 free((caddr_t)nmp, M_NFSMNT); 747 m_freem(nam); 748 return (error); 749 } 750 751 /* 752 * unmount system call 753 */ 754 int 755 nfs_unmount(mp, mntflags, p) 756 struct mount *mp; 757 int mntflags; 758 struct proc *p; 759 { 760 struct nfsmount *nmp; 761 struct vnode *vp; 762 int error, flags = 0; 763 764 if (mntflags & MNT_FORCE) 765 flags |= FORCECLOSE; 766 nmp = VFSTONFS(mp); 767 /* 768 * Goes something like this.. 769 * - Check for activity on the root vnode (other than ourselves). 770 * - Call vflush() to clear out vnodes for this file system, 771 * except for the root vnode. 772 * - Decrement reference on the vnode representing remote root. 773 * - Close the socket 774 * - Free up the data structures 775 */ 776 /* 777 * We need to decrement the ref. count on the nfsnode representing 778 * the remote root. See comment in mountnfs(). The VFS unmount() 779 * has done vput on this vnode, otherwise we would get deadlock! 780 */ 781 vp = nmp->nm_vnode; 782 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 783 if (error != 0) 784 return error; 785 786 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 787 vput(vp); 788 return (EBUSY); 789 } 790 791 /* 792 * Must handshake with nqnfs_clientd() if it is active. 793 */ 794 nmp->nm_iflag |= NFSMNT_DISMINPROG; 795 while (nmp->nm_inprog != NULLVP) 796 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 797 error = vflush(mp, vp, flags); 798 if (error) { 799 vput(vp); 800 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 801 return (error); 802 } 803 804 /* 805 * We are now committed to the unmount; mark the mount structure 806 * as doomed so that any sleepers kicked awake by nfs_disconnect 807 * will go away cleanly. 808 */ 809 nmp->nm_iflag |= NFSMNT_DISMNT; 810 811 /* 812 * There are two reference counts to get rid of here 813 * (see comment in mountnfs()). 814 */ 815 vrele(vp); 816 vput(vp); 817 vgone(vp); 818 nfs_disconnect(nmp); 819 m_freem(nmp->nm_nam); 820 821 /* 822 * For NQNFS, let the server daemon free the nfsmount structure. 823 */ 824 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 825 free((caddr_t)nmp, M_NFSMNT); 826 return (0); 827 } 828 829 /* 830 * Return root of a filesystem 831 */ 832 int 833 nfs_root(mp, vpp) 834 struct mount *mp; 835 struct vnode **vpp; 836 { 837 struct vnode *vp; 838 struct nfsmount *nmp; 839 int error; 840 841 nmp = VFSTONFS(mp); 842 vp = nmp->nm_vnode; 843 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 844 if (error != 0) 845 return error; 846 if (vp->v_type == VNON) 847 vp->v_type = VDIR; 848 vp->v_flag = VROOT; 849 *vpp = vp; 850 return (0); 851 } 852 853 extern int syncprt; 854 855 /* 856 * Flush out the buffer cache 857 */ 858 /* ARGSUSED */ 859 int 860 nfs_sync(mp, waitfor, cred, p) 861 struct mount *mp; 862 int waitfor; 863 struct ucred *cred; 864 struct proc *p; 865 { 866 struct vnode *vp; 867 int error, allerror = 0; 868 869 /* 870 * Force stale buffer cache information to be flushed. 871 */ 872 loop: 873 for (vp = mp->mnt_vnodelist.lh_first; 874 vp != NULL; 875 vp = vp->v_mntvnodes.le_next) { 876 /* 877 * If the vnode that we are about to sync is no longer 878 * associated with this mount point, start over. 879 */ 880 if (vp->v_mount != mp) 881 goto loop; 882 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 883 (LIST_EMPTY(&vp->v_dirtyblkhd) && 884 vp->v_uvm.u_obj.uo_npages == 0)) 885 continue; 886 if (vget(vp, LK_EXCLUSIVE)) 887 goto loop; 888 error = VOP_FSYNC(vp, cred, 889 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 890 if (error) 891 allerror = error; 892 vput(vp); 893 } 894 return (allerror); 895 } 896 897 /* 898 * NFS flat namespace lookup. 899 * Currently unsupported. 900 */ 901 /* ARGSUSED */ 902 int 903 nfs_vget(mp, ino, vpp) 904 struct mount *mp; 905 ino_t ino; 906 struct vnode **vpp; 907 { 908 909 return (EOPNOTSUPP); 910 } 911 912 /* 913 * Do that sysctl thang... 914 */ 915 int 916 nfs_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 917 int *name; 918 u_int namelen; 919 void *oldp; 920 size_t *oldlenp; 921 void *newp; 922 size_t newlen; 923 struct proc *p; 924 { 925 int rv; 926 927 /* 928 * All names at this level are terminal. 929 */ 930 if(namelen > 1) 931 return ENOTDIR; /* overloaded */ 932 933 switch(name[0]) { 934 case NFS_NFSSTATS: 935 if(!oldp) { 936 *oldlenp = sizeof nfsstats; 937 return 0; 938 } 939 940 if(*oldlenp < sizeof nfsstats) { 941 *oldlenp = sizeof nfsstats; 942 return ENOMEM; 943 } 944 945 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 946 if(rv) return rv; 947 948 if(newp && newlen != sizeof nfsstats) 949 return EINVAL; 950 951 if(newp) { 952 return copyin(newp, &nfsstats, sizeof nfsstats); 953 } 954 return 0; 955 956 case NFS_IOTHREADS: 957 nfs_getset_niothreads(0); 958 959 rv = (sysctl_int(oldp, oldlenp, newp, newlen, 960 &nfs_niothreads)); 961 962 if (newp) 963 nfs_getset_niothreads(1); 964 965 return rv; 966 967 default: 968 return EOPNOTSUPP; 969 } 970 } 971 972 973 /* 974 * At this point, this should never happen 975 */ 976 /* ARGSUSED */ 977 int 978 nfs_fhtovp(mp, fhp, vpp) 979 struct mount *mp; 980 struct fid *fhp; 981 struct vnode **vpp; 982 { 983 984 return (EINVAL); 985 } 986 987 /* ARGSUSED */ 988 int 989 nfs_checkexp(mp, nam, exflagsp, credanonp) 990 struct mount *mp; 991 struct mbuf *nam; 992 int *exflagsp; 993 struct ucred **credanonp; 994 { 995 996 return (EINVAL); 997 } 998 999 /* 1000 * Vnode pointer to File handle, should never happen either 1001 */ 1002 /* ARGSUSED */ 1003 int 1004 nfs_vptofh(vp, fhp) 1005 struct vnode *vp; 1006 struct fid *fhp; 1007 { 1008 1009 return (EINVAL); 1010 } 1011 1012 /* 1013 * Vfs start routine, a no-op. 1014 */ 1015 /* ARGSUSED */ 1016 int 1017 nfs_start(mp, flags, p) 1018 struct mount *mp; 1019 int flags; 1020 struct proc *p; 1021 { 1022 1023 return (0); 1024 } 1025 1026 /* 1027 * Do operations associated with quotas, not supported 1028 */ 1029 /* ARGSUSED */ 1030 int 1031 nfs_quotactl(mp, cmd, uid, arg, p) 1032 struct mount *mp; 1033 int cmd; 1034 uid_t uid; 1035 caddr_t arg; 1036 struct proc *p; 1037 { 1038 1039 return (EOPNOTSUPP); 1040 } 1041
Indexes created Wed Sep 24 14:09:57 GMT 2025