nfs_vfsops.c revision 1.131.2.8
1 /* $NetBSD: nfs_vfsops.c,v 1.131.2.8 2005/03/04 16:54:21 skrll 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.131.2.8 2005/03/04 16:54:21 skrll Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_compat_netbsd.h" 42 #include "opt_nfs.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/ioctl.h> 47 #include <sys/signal.h> 48 #include <sys/proc.h> 49 #include <sys/namei.h> 50 #include <sys/device.h> 51 #include <sys/vnode.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/mbuf.h> 56 #include <sys/dirent.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 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 81 82 /* 83 * nfs vfs operations. 84 */ 85 86 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 87 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 88 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 89 90 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 91 &nfsv2_vnodeop_opv_desc, 92 &spec_nfsv2nodeop_opv_desc, 93 &fifo_nfsv2nodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops nfs_vfsops = { 98 MOUNT_NFS, 99 nfs_mount, 100 nfs_start, 101 nfs_unmount, 102 nfs_root, 103 nfs_quotactl, 104 nfs_statvfs, 105 nfs_sync, 106 nfs_vget, 107 nfs_fhtovp, 108 nfs_vptofh, 109 nfs_vfs_init, 110 nfs_vfs_reinit, 111 nfs_vfs_done, 112 NULL, 113 nfs_mountroot, 114 nfs_checkexp, 115 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 116 vfs_stdextattrctl, 117 nfs_vnodeopv_descs, 118 }; 119 120 extern u_int32_t nfs_procids[NFS_NPROCS]; 121 extern u_int32_t nfs_prog, nfs_vers; 122 123 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 124 struct mount **, struct vnode **, struct lwp *)); 125 126 /* 127 * nfs statvfs call 128 */ 129 int 130 nfs_statvfs(mp, sbp, l) 131 struct mount *mp; 132 struct statvfs *sbp; 133 struct lwp *l; 134 { 135 struct vnode *vp; 136 struct nfs_statfs *sfp; 137 caddr_t cp; 138 u_int32_t *tl; 139 int32_t t1, t2; 140 caddr_t bpos, dpos, cp2; 141 struct nfsmount *nmp = VFSTONFS(mp); 142 int error = 0, retattr; 143 #ifdef NFS_V2_ONLY 144 const int v3 = 0; 145 #else 146 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 147 #endif 148 struct mbuf *mreq, *mrep = NULL, *md, *mb; 149 struct ucred *cred; 150 u_quad_t tquad; 151 struct nfsnode *np; 152 153 #ifndef nolint 154 sfp = (struct nfs_statfs *)0; 155 #endif 156 vp = nmp->nm_vnode; 157 np = VTONFS(vp); 158 cred = crget(); 159 cred->cr_ngroups = 0; 160 #ifndef NFS_V2_ONLY 161 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 162 (void)nfs_fsinfo(nmp, vp, cred, l); 163 #endif 164 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 165 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 166 nfsm_fhtom(np, v3); 167 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 168 if (v3) 169 nfsm_postop_attr(vp, retattr, 0); 170 if (error) { 171 if (mrep != NULL) { 172 if (mrep->m_next != NULL) 173 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 174 m_freem(mrep); 175 } 176 goto nfsmout; 177 } 178 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 179 sbp->f_flag = nmp->nm_flag; 180 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 181 if (v3) { 182 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 183 tquad = fxdr_hyper(&sfp->sf_tbytes); 184 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 185 tquad = fxdr_hyper(&sfp->sf_fbytes); 186 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 187 tquad = fxdr_hyper(&sfp->sf_abytes); 188 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 189 sbp->f_bresvd = sbp->f_bfree - tquad; 190 sbp->f_bavail = tquad; 191 #ifdef COMPAT_20 192 /* Handle older NFS servers returning negative values */ 193 if ((quad_t)sbp->f_bavail < 0) 194 sbp->f_bavail = 0; 195 #endif 196 tquad = fxdr_hyper(&sfp->sf_tfiles); 197 sbp->f_files = tquad; 198 tquad = fxdr_hyper(&sfp->sf_ffiles); 199 sbp->f_ffree = tquad; 200 sbp->f_favail = tquad; 201 sbp->f_fresvd = 0; 202 sbp->f_namemax = MAXNAMLEN; 203 } else { 204 sbp->f_bsize = NFS_FABLKSIZE; 205 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 206 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 207 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 208 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 209 sbp->f_fresvd = 0; 210 sbp->f_files = 0; 211 sbp->f_ffree = 0; 212 sbp->f_favail = 0; 213 sbp->f_fresvd = 0; 214 sbp->f_namemax = MAXNAMLEN; 215 } 216 copy_statvfs_info(sbp, mp); 217 nfsm_reqdone; 218 crfree(cred); 219 return (error); 220 } 221 222 #ifndef NFS_V2_ONLY 223 /* 224 * nfs version 3 fsinfo rpc call 225 */ 226 int 227 nfs_fsinfo(nmp, vp, cred, l) 228 struct nfsmount *nmp; 229 struct vnode *vp; 230 struct ucred *cred; 231 struct lwp *l; 232 { 233 struct nfsv3_fsinfo *fsp; 234 caddr_t cp; 235 int32_t t1, t2; 236 u_int32_t *tl, pref, max; 237 caddr_t bpos, dpos, cp2; 238 int error = 0, retattr; 239 struct mbuf *mreq, *mrep, *md, *mb; 240 u_int64_t maxfsize; 241 struct nfsnode *np = VTONFS(vp); 242 243 nfsstats.rpccnt[NFSPROC_FSINFO]++; 244 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 245 nfsm_fhtom(np, 1); 246 nfsm_request(np, NFSPROC_FSINFO, l, cred); 247 nfsm_postop_attr(vp, retattr, 0); 248 if (!error) { 249 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 250 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 251 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 252 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 253 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 254 ~(NFS_FABLKSIZE - 1); 255 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 256 if (max < nmp->nm_wsize && max > 0) { 257 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 258 if (nmp->nm_wsize == 0) 259 nmp->nm_wsize = max; 260 } 261 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 262 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 263 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 264 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 265 ~(NFS_FABLKSIZE - 1); 266 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 267 if (max < nmp->nm_rsize && max > 0) { 268 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 269 if (nmp->nm_rsize == 0) 270 nmp->nm_rsize = max; 271 } 272 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 273 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 274 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 275 ~(NFS_DIRFRAGSIZ - 1); 276 if (max < nmp->nm_readdirsize && max > 0) { 277 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 278 if (nmp->nm_readdirsize == 0) 279 nmp->nm_readdirsize = max; 280 } 281 /* XXX */ 282 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 283 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 284 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 285 nmp->nm_maxfilesize = maxfsize; 286 nmp->nm_mountp->mnt_fs_bshift = 287 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 288 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 289 } 290 nfsm_reqdone; 291 return (error); 292 } 293 #endif 294 295 /* 296 * Mount a remote root fs via. NFS. It goes like this: 297 * - Call nfs_boot_init() to fill in the nfs_diskless struct 298 * - build the rootfs mount point and call mountnfs() to do the rest. 299 */ 300 int 301 nfs_mountroot() 302 { 303 struct nfs_diskless *nd; 304 struct vattr attr; 305 struct mount *mp; 306 struct vnode *vp; 307 struct lwp *l; 308 long n; 309 int error; 310 311 l = curlwp; /* XXX */ 312 313 if (root_device->dv_class != DV_IFNET) 314 return (ENODEV); 315 316 /* 317 * XXX time must be non-zero when we init the interface or else 318 * the arp code will wedge. [Fixed now in if_ether.c] 319 * However, the NFS attribute cache gives false "hits" when 320 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 321 */ 322 if (time.tv_sec < NFS_MAXATTRTIMO) 323 time.tv_sec = NFS_MAXATTRTIMO; 324 325 /* 326 * Call nfs_boot_init() to fill in the nfs_diskless struct. 327 * Side effect: Finds and configures a network interface. 328 */ 329 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 330 memset((caddr_t)nd, 0, sizeof(*nd)); 331 error = nfs_boot_init(nd, l); 332 if (error) { 333 free(nd, M_NFSMNT); 334 return (error); 335 } 336 337 /* 338 * Create the root mount point. 339 */ 340 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 341 if (error) 342 goto out; 343 printf("root on %s\n", nd->nd_root.ndm_host); 344 345 /* 346 * Link it into the mount list. 347 */ 348 simple_lock(&mountlist_slock); 349 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 350 simple_unlock(&mountlist_slock); 351 rootvp = vp; 352 mp->mnt_vnodecovered = NULLVP; 353 vfs_unbusy(mp); 354 355 /* Get root attributes (for the time). */ 356 error = VOP_GETATTR(vp, &attr, l->l_proc->p_ucred, l); 357 if (error) 358 panic("nfs_mountroot: getattr for root"); 359 n = attr.va_atime.tv_sec; 360 #ifdef DEBUG 361 printf("root time: 0x%lx\n", n); 362 #endif 363 setrootfstime(n); 364 365 out: 366 if (error) 367 nfs_boot_cleanup(nd, l); 368 free(nd, M_NFSMNT); 369 return (error); 370 } 371 372 /* 373 * Internal version of mount system call for diskless setup. 374 * Separate function because we used to call it twice. 375 * (once for root and once for swap) 376 */ 377 static int 378 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 379 struct nfs_dlmount *ndmntp; 380 const char *mntname; /* mount point name */ 381 struct mount **mpp; 382 struct vnode **vpp; 383 struct lwp *l; 384 { 385 struct mount *mp; 386 struct mbuf *m; 387 int error; 388 389 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 390 391 mp->mnt_op = &nfs_vfsops; 392 393 /* 394 * Historical practice expects NFS root file systems to 395 * be initially mounted r/w. 396 */ 397 mp->mnt_flag &= ~MNT_RDONLY; 398 399 /* Get mbuf for server sockaddr. */ 400 m = m_get(M_WAIT, MT_SONAME); 401 if (m == NULL) 402 panic("nfs_mountroot: mget soname for %s", mntname); 403 MCLAIM(m, &nfs_mowner); 404 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 405 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 406 407 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 408 ndmntp->ndm_args.hostname, vpp, l); 409 if (error) { 410 mp->mnt_op->vfs_refcount--; 411 vfs_unbusy(mp); 412 printf("nfs_mountroot: mount %s failed: %d\n", 413 mntname, error); 414 free(mp, M_MOUNT); 415 } else 416 *mpp = mp; 417 418 return (error); 419 } 420 421 void 422 nfs_decode_args(nmp, argp, l) 423 struct nfsmount *nmp; 424 struct nfs_args *argp; 425 struct lwp *l; 426 { 427 int s; 428 int adjsock; 429 int maxio; 430 431 s = splsoftnet(); 432 433 /* 434 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 435 * no sense in that context. 436 */ 437 if (argp->sotype == SOCK_STREAM) 438 argp->flags &= ~NFSMNT_NOCONN; 439 440 /* 441 * Cookie translation is not needed for v2, silently ignore it. 442 */ 443 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 444 NFSMNT_XLATECOOKIE) 445 argp->flags &= ~NFSMNT_XLATECOOKIE; 446 447 /* Re-bind if rsrvd port requested and wasn't on one */ 448 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 449 && (argp->flags & NFSMNT_RESVPORT); 450 /* Also re-bind if we're switching to/from a connected UDP socket */ 451 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 452 (argp->flags & NFSMNT_NOCONN)); 453 454 /* Update flags. */ 455 nmp->nm_flag = argp->flags; 456 splx(s); 457 458 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 459 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 460 if (nmp->nm_timeo < NFS_MINTIMEO) 461 nmp->nm_timeo = NFS_MINTIMEO; 462 else if (nmp->nm_timeo > NFS_MAXTIMEO) 463 nmp->nm_timeo = NFS_MAXTIMEO; 464 } 465 466 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 467 nmp->nm_retry = argp->retrans; 468 if (nmp->nm_retry > NFS_MAXREXMIT) 469 nmp->nm_retry = NFS_MAXREXMIT; 470 } 471 472 #ifndef NFS_V2_ONLY 473 if (argp->flags & NFSMNT_NFSV3) { 474 if (argp->sotype == SOCK_DGRAM) 475 maxio = NFS_MAXDGRAMDATA; 476 else 477 maxio = NFS_MAXDATA; 478 } else 479 #endif 480 maxio = NFS_V2MAXDATA; 481 482 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 483 int osize = nmp->nm_wsize; 484 nmp->nm_wsize = argp->wsize; 485 /* Round down to multiple of blocksize */ 486 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 487 if (nmp->nm_wsize <= 0) 488 nmp->nm_wsize = NFS_FABLKSIZE; 489 adjsock |= (nmp->nm_wsize != osize); 490 } 491 if (nmp->nm_wsize > maxio) 492 nmp->nm_wsize = maxio; 493 if (nmp->nm_wsize > MAXBSIZE) 494 nmp->nm_wsize = MAXBSIZE; 495 496 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 497 int osize = nmp->nm_rsize; 498 nmp->nm_rsize = argp->rsize; 499 /* Round down to multiple of blocksize */ 500 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 501 if (nmp->nm_rsize <= 0) 502 nmp->nm_rsize = NFS_FABLKSIZE; 503 adjsock |= (nmp->nm_rsize != osize); 504 } 505 if (nmp->nm_rsize > maxio) 506 nmp->nm_rsize = maxio; 507 if (nmp->nm_rsize > MAXBSIZE) 508 nmp->nm_rsize = MAXBSIZE; 509 510 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 511 nmp->nm_readdirsize = argp->readdirsize; 512 /* Round down to multiple of minimum blocksize */ 513 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 514 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 515 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 516 /* Bigger than buffer size makes no sense */ 517 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 518 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 519 } else if (argp->flags & NFSMNT_RSIZE) 520 nmp->nm_readdirsize = nmp->nm_rsize; 521 522 if (nmp->nm_readdirsize > maxio) 523 nmp->nm_readdirsize = maxio; 524 525 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 526 argp->maxgrouplist <= NFS_MAXGRPS) 527 nmp->nm_numgrps = argp->maxgrouplist; 528 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 529 argp->readahead <= NFS_MAXRAHEAD) 530 nmp->nm_readahead = argp->readahead; 531 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 532 argp->leaseterm <= NQ_MAXLEASE) 533 nmp->nm_leaseterm = argp->leaseterm; 534 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 535 argp->deadthresh <= NQ_NEVERDEAD) 536 nmp->nm_deadthresh = argp->deadthresh; 537 538 adjsock |= ((nmp->nm_sotype != argp->sotype) || 539 (nmp->nm_soproto != argp->proto)); 540 nmp->nm_sotype = argp->sotype; 541 nmp->nm_soproto = argp->proto; 542 543 if (nmp->nm_so && adjsock) { 544 nfs_safedisconnect(nmp); 545 if (nmp->nm_sotype == SOCK_DGRAM) 546 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 547 printf("nfs_args: retrying connect\n"); 548 (void) tsleep((caddr_t)&lbolt, 549 PSOCK, "nfscn3", 0); 550 } 551 } 552 } 553 554 /* 555 * VFS Operations. 556 * 557 * mount system call 558 * It seems a bit dumb to copyinstr() the host and path here and then 559 * memcpy() them in mountnfs(), but I wanted to detect errors before 560 * doing the sockargs() call because sockargs() allocates an mbuf and 561 * an error after that means that I have to release the mbuf. 562 */ 563 /* ARGSUSED */ 564 int 565 nfs_mount(mp, path, data, ndp, l) 566 struct mount *mp; 567 const char *path; 568 void *data; 569 struct nameidata *ndp; 570 struct lwp *l; 571 { 572 int error; 573 struct nfs_args args; 574 struct mbuf *nam; 575 struct nfsmount *nmp = VFSTONFS(mp); 576 struct sockaddr *sa; 577 struct vnode *vp; 578 char *pth, *hst; 579 struct proc *p; 580 size_t len; 581 u_char *nfh; 582 583 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 584 if (error) 585 return (error); 586 587 p = l->l_proc; 588 if (mp->mnt_flag & MNT_GETARGS) { 589 590 if (nmp == NULL) 591 return (EIO); 592 if (args.addr != NULL) { 593 sa = mtod(nmp->nm_nam, struct sockaddr *); 594 error = copyout(sa, args.addr, sa->sa_len); 595 if (error) 596 return (error); 597 args.addrlen = sa->sa_len; 598 } else 599 args.addrlen = 0; 600 601 args.version = NFS_ARGSVERSION; 602 args.sotype = nmp->nm_sotype; 603 args.proto = nmp->nm_soproto; 604 args.fh = NULL; 605 args.fhsize = 0; 606 args.flags = nmp->nm_flag; 607 args.wsize = nmp->nm_wsize; 608 args.rsize = nmp->nm_rsize; 609 args.readdirsize = nmp->nm_readdirsize; 610 args.timeo = nmp->nm_timeo; 611 args.retrans = nmp->nm_retry; 612 args.maxgrouplist = nmp->nm_numgrps; 613 args.readahead = nmp->nm_readahead; 614 args.leaseterm = nmp->nm_leaseterm; 615 args.deadthresh = nmp->nm_deadthresh; 616 args.hostname = NULL; 617 return (copyout(&args, data, sizeof(args))); 618 } 619 620 if (args.version != NFS_ARGSVERSION) 621 return (EPROGMISMATCH); 622 #ifdef NFS_V2_ONLY 623 if (args.flags & NFSMNT_NQNFS) 624 return (EPROGUNAVAIL); 625 if (args.flags & NFSMNT_NFSV3) 626 return (EPROGMISMATCH); 627 #endif 628 if (mp->mnt_flag & MNT_UPDATE) { 629 if (nmp == NULL) 630 return (EIO); 631 /* 632 * When doing an update, we can't change from or to 633 * v3 and/or nqnfs, or change cookie translation 634 */ 635 args.flags = (args.flags & 636 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 637 (nmp->nm_flag & 638 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 639 nfs_decode_args(nmp, &args, l); 640 return (0); 641 } 642 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 643 return (EINVAL); 644 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 645 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 646 if (error) 647 return (error); 648 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 649 error = copyinstr(path, pth, MNAMELEN - 1, &len); 650 if (error) 651 goto free_nfh; 652 memset(&pth[len], 0, MNAMELEN - len); 653 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 654 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 655 if (error) 656 goto free_pth; 657 memset(&hst[len], 0, MNAMELEN - len); 658 /* sockargs() call must be after above copyin() calls */ 659 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 660 if (error) 661 goto free_hst; 662 MCLAIM(nam, &nfs_mowner); 663 args.fh = nfh; 664 error = mountnfs(&args, mp, nam, pth, hst, &vp, l); 665 666 free_hst: 667 FREE(hst, M_TEMP); 668 free_pth: 669 FREE(pth, M_TEMP); 670 free_nfh: 671 FREE(nfh, M_TEMP); 672 673 return (error); 674 } 675 676 /* 677 * Common code for mount and mountroot 678 */ 679 int 680 mountnfs(argp, mp, nam, pth, hst, vpp, l) 681 struct nfs_args *argp; 682 struct mount *mp; 683 struct mbuf *nam; 684 const char *pth, *hst; 685 struct vnode **vpp; 686 struct lwp *l; 687 { 688 struct nfsmount *nmp; 689 struct nfsnode *np; 690 int error; 691 struct vattr *attrs; 692 struct ucred *cr; 693 694 /* 695 * If the number of nfs iothreads to use has never 696 * been set, create a reasonable number of them. 697 */ 698 699 if (nfs_niothreads < 0) { 700 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 701 nfs_getset_niothreads(TRUE); 702 } 703 704 if (mp->mnt_flag & MNT_UPDATE) { 705 nmp = VFSTONFS(mp); 706 /* update paths, file handles, etc, here XXX */ 707 m_freem(nam); 708 return (0); 709 } else { 710 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 711 M_NFSMNT, M_WAITOK); 712 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 713 mp->mnt_data = nmp; 714 TAILQ_INIT(&nmp->nm_uidlruhead); 715 TAILQ_INIT(&nmp->nm_bufq); 716 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 717 simple_lock_init(&nmp->nm_slock); 718 } 719 vfs_getnewfsid(mp); 720 nmp->nm_mountp = mp; 721 722 #ifndef NFS_V2_ONLY 723 if (argp->flags & NFSMNT_NQNFS) 724 mp->mnt_iflag |= IMNT_DTYPE; 725 #endif 726 727 #ifndef NFS_V2_ONLY 728 if ((argp->flags & NFSMNT_NFSV3) == 0) 729 #endif 730 /* 731 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 732 * will fill this in. 733 */ 734 nmp->nm_maxfilesize = 0xffffffffLL; 735 736 nmp->nm_timeo = NFS_TIMEO; 737 nmp->nm_retry = NFS_RETRANS; 738 nmp->nm_wsize = NFS_WSIZE; 739 nmp->nm_rsize = NFS_RSIZE; 740 nmp->nm_readdirsize = NFS_READDIRSIZE; 741 nmp->nm_numgrps = NFS_MAXGRPS; 742 nmp->nm_readahead = NFS_DEFRAHEAD; 743 nmp->nm_leaseterm = NQ_DEFLEASE; 744 nmp->nm_deadthresh = NQ_DEADTHRESH; 745 CIRCLEQ_INIT(&nmp->nm_timerhead); 746 nmp->nm_inprog = NULLVP; 747 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, l); 748 if (error) 749 goto bad; 750 nmp->nm_nam = nam; 751 752 /* Set up the sockets and per-host congestion */ 753 nmp->nm_sotype = argp->sotype; 754 nmp->nm_soproto = argp->proto; 755 756 nfs_decode_args(nmp, argp, l); 757 758 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 759 mp->mnt_dev_bshift = DEV_BSHIFT; 760 761 /* 762 * For Connection based sockets (TCP,...) defer the connect until 763 * the first request, in case the server is not responding. 764 */ 765 if (nmp->nm_sotype == SOCK_DGRAM && 766 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 767 goto bad; 768 769 /* 770 * This is silly, but it has to be set so that vinifod() works. 771 * We do not want to do an nfs_statvfs() here since we can get 772 * stuck on a dead server and we are holding a lock on the mount 773 * point. 774 */ 775 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 776 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np, l); 777 if (error) 778 goto bad; 779 *vpp = NFSTOV(np); 780 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 781 VOP_GETATTR(*vpp, attrs, l->l_proc->p_ucred, l); 782 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 783 cr = crget(); 784 cr->cr_uid = attrs->va_uid; 785 cr->cr_gid = attrs->va_gid; 786 cr->cr_ngroups = 0; 787 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 788 crfree(cr); 789 } 790 FREE(attrs, M_TEMP); 791 792 /* 793 * A reference count is needed on the nfsnode representing the 794 * remote root. If this object is not persistent, then backward 795 * traversals of the mount point (i.e. "..") will not work if 796 * the nfsnode gets flushed out of the cache. Ufs does not have 797 * this problem, because one can identify root inodes by their 798 * number == ROOTINO (2). So, just unlock, but no rele. 799 */ 800 801 nmp->nm_vnode = *vpp; 802 VOP_UNLOCK(*vpp, 0); 803 804 return (0); 805 bad: 806 nfs_disconnect(nmp); 807 free((caddr_t)nmp, M_NFSMNT); 808 m_freem(nam); 809 return (error); 810 } 811 812 /* 813 * unmount system call 814 */ 815 int 816 nfs_unmount(mp, mntflags, l) 817 struct mount *mp; 818 int mntflags; 819 struct lwp *l; 820 { 821 struct nfsmount *nmp; 822 struct vnode *vp; 823 int error, flags = 0; 824 825 if (mntflags & MNT_FORCE) 826 flags |= FORCECLOSE; 827 nmp = VFSTONFS(mp); 828 /* 829 * Goes something like this.. 830 * - Check for activity on the root vnode (other than ourselves). 831 * - Call vflush() to clear out vnodes for this file system, 832 * except for the root vnode. 833 * - Decrement reference on the vnode representing remote root. 834 * - Close the socket 835 * - Free up the data structures 836 */ 837 /* 838 * We need to decrement the ref. count on the nfsnode representing 839 * the remote root. See comment in mountnfs(). The VFS unmount() 840 * has done vput on this vnode, otherwise we would get deadlock! 841 */ 842 vp = nmp->nm_vnode; 843 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 844 if (error != 0) 845 return error; 846 847 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 848 vput(vp); 849 return (EBUSY); 850 } 851 852 /* 853 * Must handshake with nqnfs_clientd() if it is active. 854 */ 855 nmp->nm_iflag |= NFSMNT_DISMINPROG; 856 while (nmp->nm_inprog != NULLVP) 857 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 858 error = vflush(mp, vp, flags); 859 if (error) { 860 vput(vp); 861 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 862 return (error); 863 } 864 865 /* 866 * We are now committed to the unmount; mark the mount structure 867 * as doomed so that any sleepers kicked awake by nfs_disconnect 868 * will go away cleanly. 869 */ 870 nmp->nm_iflag |= NFSMNT_DISMNT; 871 872 /* 873 * There are two reference counts to get rid of here 874 * (see comment in mountnfs()). 875 */ 876 vrele(vp); 877 vput(vp); 878 vgone(vp); 879 nfs_disconnect(nmp); 880 m_freem(nmp->nm_nam); 881 882 /* 883 * For NQNFS, let the server daemon free the nfsmount structure. 884 */ 885 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 886 free((caddr_t)nmp, M_NFSMNT); 887 return (0); 888 } 889 890 /* 891 * Return root of a filesystem 892 */ 893 int 894 nfs_root(mp, vpp) 895 struct mount *mp; 896 struct vnode **vpp; 897 { 898 struct vnode *vp; 899 struct nfsmount *nmp; 900 int error; 901 902 nmp = VFSTONFS(mp); 903 vp = nmp->nm_vnode; 904 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 905 if (error != 0) 906 return error; 907 if (vp->v_type == VNON) 908 vp->v_type = VDIR; 909 vp->v_flag = VROOT; 910 *vpp = vp; 911 return (0); 912 } 913 914 extern int syncprt; 915 916 /* 917 * Flush out the buffer cache 918 */ 919 /* ARGSUSED */ 920 int 921 nfs_sync(mp, waitfor, cred, l) 922 struct mount *mp; 923 int waitfor; 924 struct ucred *cred; 925 struct lwp *l; 926 { 927 struct vnode *vp; 928 int error, allerror = 0; 929 930 /* 931 * Force stale buffer cache information to be flushed. 932 */ 933 loop: 934 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 935 /* 936 * If the vnode that we are about to sync is no longer 937 * associated with this mount point, start over. 938 */ 939 if (vp->v_mount != mp) 940 goto loop; 941 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 942 (LIST_EMPTY(&vp->v_dirtyblkhd) && 943 vp->v_uobj.uo_npages == 0)) 944 continue; 945 if (vget(vp, LK_EXCLUSIVE)) 946 goto loop; 947 error = VOP_FSYNC(vp, cred, 948 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l); 949 if (error) 950 allerror = error; 951 vput(vp); 952 } 953 return (allerror); 954 } 955 956 /* 957 * NFS flat namespace lookup. 958 * Currently unsupported. 959 */ 960 /* ARGSUSED */ 961 int 962 nfs_vget(mp, ino, vpp) 963 struct mount *mp; 964 ino_t ino; 965 struct vnode **vpp; 966 { 967 968 return (EOPNOTSUPP); 969 } 970 971 /* 972 * Do that sysctl thang... 973 */ 974 static int 975 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 976 { 977 int error; 978 979 nfs_getset_niothreads(0); 980 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 981 if (error || newp == NULL) 982 return (error); 983 nfs_getset_niothreads(1); 984 985 return (0); 986 } 987 988 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 989 { 990 991 sysctl_createv(clog, 0, NULL, NULL, 992 CTLFLAG_PERMANENT, 993 CTLTYPE_NODE, "vfs", NULL, 994 NULL, 0, NULL, 0, 995 CTL_VFS, CTL_EOL); 996 sysctl_createv(clog, 0, NULL, NULL, 997 CTLFLAG_PERMANENT, 998 CTLTYPE_NODE, "nfs", 999 SYSCTL_DESCR("NFS vfs options"), 1000 NULL, 0, NULL, 0, 1001 CTL_VFS, 2, CTL_EOL); 1002 /* 1003 * XXX the "2" above could be dynamic, thereby eliminating one 1004 * more instance of the "number to vfs" mapping problem, but 1005 * "2" is the order as taken from sys/mount.h 1006 */ 1007 1008 sysctl_createv(clog, 0, NULL, NULL, 1009 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1010 CTLTYPE_STRUCT, "nfsstats", 1011 SYSCTL_DESCR("NFS operation statistics"), 1012 NULL, 0, &nfsstats, sizeof(nfsstats), 1013 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1014 sysctl_createv(clog, 0, NULL, NULL, 1015 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1016 CTLTYPE_INT, "iothreads", 1017 SYSCTL_DESCR("Number of NFS client processes desired"), 1018 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1019 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1020 } 1021 1022 /* 1023 * At this point, this should never happen 1024 */ 1025 /* ARGSUSED */ 1026 int 1027 nfs_fhtovp(mp, fhp, vpp) 1028 struct mount *mp; 1029 struct fid *fhp; 1030 struct vnode **vpp; 1031 { 1032 1033 return (EINVAL); 1034 } 1035 1036 /* ARGSUSED */ 1037 int 1038 nfs_checkexp(mp, nam, exflagsp, credanonp) 1039 struct mount *mp; 1040 struct mbuf *nam; 1041 int *exflagsp; 1042 struct ucred **credanonp; 1043 { 1044 1045 return (EINVAL); 1046 } 1047 1048 /* 1049 * Vnode pointer to File handle, should never happen either 1050 */ 1051 /* ARGSUSED */ 1052 int 1053 nfs_vptofh(vp, fhp) 1054 struct vnode *vp; 1055 struct fid *fhp; 1056 { 1057 1058 return (EINVAL); 1059 } 1060 1061 /* 1062 * Vfs start routine, a no-op. 1063 */ 1064 /* ARGSUSED */ 1065 int 1066 nfs_start(mp, flags, l) 1067 struct mount *mp; 1068 int flags; 1069 struct lwp *l; 1070 { 1071 1072 return (0); 1073 } 1074 1075 /* 1076 * Do operations associated with quotas, not supported 1077 */ 1078 /* ARGSUSED */ 1079 int 1080 nfs_quotactl(mp, cmd, uid, arg, l) 1081 struct mount *mp; 1082 int cmd; 1083 uid_t uid; 1084 void *arg; 1085 struct lwp *l; 1086 { 1087 1088 return (EOPNOTSUPP); 1089 } 1090
Indexes created Wed Oct 01 07:09:59 GMT 2025