1 /* $NetBSD: nfs_vfsops.c,v 1.188 2007/11/26 19:02:21 pooka 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 1.188 2007/11/26 19:02:21 pooka 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 #include <sys/timetc.h> 62 #include <sys/kauth.h> 63 64 #include <net/if.h> 65 #include <net/route.h> 66 #include <netinet/in.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfsnode.h> 71 #include <nfs/nfs.h> 72 #include <nfs/nfsmount.h> 73 #include <nfs/xdr_subs.h> 74 #include <nfs/nfsm_subs.h> 75 #include <nfs/nfsdiskless.h> 76 #include <nfs/nfs_var.h> 77 78 extern struct nfsstats nfsstats; 79 extern int nfs_ticks; 80 81 /* 82 * keep a count of the nfs mounts to generate ficticious drive names 83 * for the per drive stats. 84 */ 85 unsigned int nfs_mount_count = 0; 86 87 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 88 89 /* 90 * nfs vfs operations. 91 */ 92 93 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 94 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 95 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 96 97 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 98 &nfsv2_vnodeop_opv_desc, 99 &spec_nfsv2nodeop_opv_desc, 100 &fifo_nfsv2nodeop_opv_desc, 101 NULL, 102 }; 103 104 struct vfsops nfs_vfsops = { 105 MOUNT_NFS, 106 sizeof (struct nfs_args), 107 nfs_mount, 108 nfs_start, 109 nfs_unmount, 110 nfs_root, 111 (void *)eopnotsupp, /* vfs_quotactl */ 112 nfs_statvfs, 113 nfs_sync, 114 nfs_vget, 115 nfs_fhtovp, 116 nfs_vptofh, 117 nfs_vfs_init, 118 nfs_vfs_reinit, 119 nfs_vfs_done, 120 nfs_mountroot, 121 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 122 vfs_stdextattrctl, 123 (void *)eopnotsupp, /* vfs_suspendctl */ 124 nfs_vnodeopv_descs, 125 0, 126 { NULL, NULL }, 127 }; 128 VFS_ATTACH(nfs_vfsops); 129 130 extern u_int32_t nfs_procids[NFS_NPROCS]; 131 extern u_int32_t nfs_prog, nfs_vers; 132 133 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 134 struct mount **, struct vnode **, struct lwp *)); 135 136 /* 137 * nfs statvfs call 138 */ 139 int 140 nfs_statvfs(mp, sbp) 141 struct mount *mp; 142 struct statvfs *sbp; 143 { 144 struct lwp *l = curlwp; 145 struct vnode *vp; 146 struct nfs_statfs *sfp; 147 char *cp; 148 u_int32_t *tl; 149 int32_t t1, t2; 150 char *bpos, *dpos, *cp2; 151 struct nfsmount *nmp = VFSTONFS(mp); 152 int error = 0, retattr; 153 #ifdef NFS_V2_ONLY 154 const int v3 = 0; 155 #else 156 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 157 #endif 158 struct mbuf *mreq, *mrep = NULL, *md, *mb; 159 kauth_cred_t cred; 160 u_quad_t tquad; 161 struct nfsnode *np; 162 163 #ifndef nolint 164 sfp = (struct nfs_statfs *)0; 165 #endif 166 vp = nmp->nm_vnode; 167 np = VTONFS(vp); 168 cred = kauth_cred_alloc(); 169 #ifndef NFS_V2_ONLY 170 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 171 (void)nfs_fsinfo(nmp, vp, cred, l); 172 #endif 173 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 174 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 175 nfsm_fhtom(np, v3); 176 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 177 if (v3) 178 nfsm_postop_attr(vp, retattr, 0); 179 if (error) { 180 if (mrep != NULL) { 181 if (mrep->m_next != NULL) 182 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 183 m_freem(mrep); 184 } 185 goto nfsmout; 186 } 187 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 188 sbp->f_flag = nmp->nm_flag; 189 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 190 if (v3) { 191 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 192 tquad = fxdr_hyper(&sfp->sf_tbytes); 193 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 194 tquad = fxdr_hyper(&sfp->sf_fbytes); 195 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 196 tquad = fxdr_hyper(&sfp->sf_abytes); 197 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 198 sbp->f_bresvd = sbp->f_bfree - tquad; 199 sbp->f_bavail = tquad; 200 #ifdef COMPAT_20 201 /* Handle older NFS servers returning negative values */ 202 if ((quad_t)sbp->f_bavail < 0) 203 sbp->f_bavail = 0; 204 #endif 205 tquad = fxdr_hyper(&sfp->sf_tfiles); 206 sbp->f_files = tquad; 207 tquad = fxdr_hyper(&sfp->sf_ffiles); 208 sbp->f_ffree = tquad; 209 sbp->f_favail = tquad; 210 sbp->f_fresvd = 0; 211 sbp->f_namemax = MAXNAMLEN; 212 } else { 213 sbp->f_bsize = NFS_FABLKSIZE; 214 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 215 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 216 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 217 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 218 sbp->f_fresvd = 0; 219 sbp->f_files = 0; 220 sbp->f_ffree = 0; 221 sbp->f_favail = 0; 222 sbp->f_fresvd = 0; 223 sbp->f_namemax = MAXNAMLEN; 224 } 225 copy_statvfs_info(sbp, mp); 226 nfsm_reqdone; 227 kauth_cred_free(cred); 228 return (error); 229 } 230 231 #ifndef NFS_V2_ONLY 232 /* 233 * nfs version 3 fsinfo rpc call 234 */ 235 int 236 nfs_fsinfo(nmp, vp, cred, l) 237 struct nfsmount *nmp; 238 struct vnode *vp; 239 kauth_cred_t cred; 240 struct lwp *l; 241 { 242 struct nfsv3_fsinfo *fsp; 243 char *cp; 244 int32_t t1, t2; 245 u_int32_t *tl, pref, xmax; 246 char *bpos, *dpos, *cp2; 247 int error = 0, retattr; 248 struct mbuf *mreq, *mrep, *md, *mb; 249 u_int64_t maxfsize; 250 struct nfsnode *np = VTONFS(vp); 251 252 nfsstats.rpccnt[NFSPROC_FSINFO]++; 253 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 254 nfsm_fhtom(np, 1); 255 nfsm_request(np, NFSPROC_FSINFO, l, cred); 256 nfsm_postop_attr(vp, retattr, 0); 257 if (!error) { 258 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 259 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 260 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 261 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 262 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 263 ~(NFS_FABLKSIZE - 1); 264 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 265 if (xmax < nmp->nm_wsize && xmax > 0) { 266 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 267 if (nmp->nm_wsize == 0) 268 nmp->nm_wsize = xmax; 269 } 270 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 271 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 272 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 273 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 274 ~(NFS_FABLKSIZE - 1); 275 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 276 if (xmax < nmp->nm_rsize && xmax > 0) { 277 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 278 if (nmp->nm_rsize == 0) 279 nmp->nm_rsize = xmax; 280 } 281 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 282 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 283 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 284 ~(NFS_DIRFRAGSIZ - 1); 285 if (xmax < nmp->nm_readdirsize && xmax > 0) { 286 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 287 if (nmp->nm_readdirsize == 0) 288 nmp->nm_readdirsize = xmax; 289 } 290 /* XXX */ 291 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 292 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 293 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 294 nmp->nm_maxfilesize = maxfsize; 295 nmp->nm_mountp->mnt_fs_bshift = 296 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 297 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 298 } 299 nfsm_reqdone; 300 return (error); 301 } 302 #endif 303 304 /* 305 * Mount a remote root fs via. NFS. It goes like this: 306 * - Call nfs_boot_init() to fill in the nfs_diskless struct 307 * - build the rootfs mount point and call mountnfs() to do the rest. 308 */ 309 int 310 nfs_mountroot() 311 { 312 #ifdef __HAVE_TIMECOUNTER 313 struct timespec ts; 314 #endif 315 struct nfs_diskless *nd; 316 struct vattr attr; 317 struct mount *mp; 318 struct vnode *vp; 319 struct lwp *l; 320 long n; 321 int error; 322 323 l = curlwp; /* XXX */ 324 325 if (device_class(root_device) != DV_IFNET) 326 return (ENODEV); 327 328 /* 329 * XXX time must be non-zero when we init the interface or else 330 * the arp code will wedge. [Fixed now in if_ether.c] 331 * However, the NFS attribute cache gives false "hits" when the 332 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 333 */ 334 if (time_second < NFS_MAXATTRTIMO) { 335 #ifdef __HAVE_TIMECOUNTER 336 ts.tv_sec = NFS_MAXATTRTIMO; 337 ts.tv_nsec = 0; 338 tc_setclock(&ts); 339 #else /* !__HAVE_TIMECOUNTER */ 340 time.tv_sec = NFS_MAXATTRTIMO; 341 #endif /* !__HAVE_TIMECOUNTER */ 342 } 343 344 /* 345 * Call nfs_boot_init() to fill in the nfs_diskless struct. 346 * Side effect: Finds and configures a network interface. 347 */ 348 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 349 memset(nd, 0, sizeof(*nd)); 350 error = nfs_boot_init(nd, l); 351 if (error) { 352 free(nd, M_NFSMNT); 353 return (error); 354 } 355 356 /* 357 * Create the root mount point. 358 */ 359 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 360 if (error) 361 goto out; 362 printf("root on %s\n", nd->nd_root.ndm_host); 363 364 /* 365 * Link it into the mount list. 366 */ 367 mutex_enter(&mountlist_lock); 368 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 369 mutex_exit(&mountlist_lock); 370 rootvp = vp; 371 mp->mnt_vnodecovered = NULLVP; 372 vfs_unbusy(mp); 373 374 /* Get root attributes (for the time). */ 375 error = VOP_GETATTR(vp, &attr, l->l_cred); 376 if (error) 377 panic("nfs_mountroot: getattr for root"); 378 n = attr.va_atime.tv_sec; 379 #ifdef DEBUG 380 printf("root time: 0x%lx\n", n); 381 #endif 382 setrootfstime(n); 383 384 out: 385 if (error) 386 nfs_boot_cleanup(nd, l); 387 free(nd, M_NFSMNT); 388 return (error); 389 } 390 391 /* 392 * Internal version of mount system call for diskless setup. 393 * Separate function because we used to call it twice. 394 * (once for root and once for swap) 395 */ 396 static int 397 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 398 struct nfs_dlmount *ndmntp; 399 const char *mntname; /* mount point name */ 400 struct mount **mpp; 401 struct vnode **vpp; 402 struct lwp *l; 403 { 404 struct mount *mp; 405 struct mbuf *m; 406 int error; 407 408 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 409 410 mp->mnt_op = &nfs_vfsops; 411 412 /* 413 * Historical practice expects NFS root file systems to 414 * be initially mounted r/w. 415 */ 416 mp->mnt_flag &= ~MNT_RDONLY; 417 418 /* Get mbuf for server sockaddr. */ 419 m = m_get(M_WAIT, MT_SONAME); 420 if (m == NULL) 421 panic("nfs_mountroot: mget soname for %s", mntname); 422 MCLAIM(m, &nfs_mowner); 423 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 424 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 425 426 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 427 ndmntp->ndm_args.hostname, vpp, l); 428 if (error) { 429 mp->mnt_op->vfs_refcount--; 430 vfs_unbusy(mp); 431 printf("nfs_mountroot: mount %s failed: %d\n", 432 mntname, error); 433 free(mp, M_MOUNT); 434 } else 435 *mpp = mp; 436 437 return (error); 438 } 439 440 void 441 nfs_decode_args(nmp, argp, l) 442 struct nfsmount *nmp; 443 struct nfs_args *argp; 444 struct lwp *l; 445 { 446 int s; 447 int adjsock; 448 int maxio; 449 450 s = splsoftnet(); 451 452 /* 453 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 454 * no sense in that context. 455 */ 456 if (argp->sotype == SOCK_STREAM) 457 argp->flags &= ~NFSMNT_NOCONN; 458 459 /* 460 * Cookie translation is not needed for v2, silently ignore it. 461 */ 462 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 463 NFSMNT_XLATECOOKIE) 464 argp->flags &= ~NFSMNT_XLATECOOKIE; 465 466 /* Re-bind if rsrvd port requested and wasn't on one */ 467 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 468 && (argp->flags & NFSMNT_RESVPORT); 469 /* Also re-bind if we're switching to/from a connected UDP socket */ 470 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 471 (argp->flags & NFSMNT_NOCONN)); 472 473 /* Update flags. */ 474 nmp->nm_flag = argp->flags; 475 splx(s); 476 477 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 478 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 479 if (nmp->nm_timeo < NFS_MINTIMEO) 480 nmp->nm_timeo = NFS_MINTIMEO; 481 else if (nmp->nm_timeo > NFS_MAXTIMEO) 482 nmp->nm_timeo = NFS_MAXTIMEO; 483 } 484 485 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 486 nmp->nm_retry = argp->retrans; 487 if (nmp->nm_retry > NFS_MAXREXMIT) 488 nmp->nm_retry = NFS_MAXREXMIT; 489 } 490 491 #ifndef NFS_V2_ONLY 492 if (argp->flags & NFSMNT_NFSV3) { 493 if (argp->sotype == SOCK_DGRAM) 494 maxio = NFS_MAXDGRAMDATA; 495 else 496 maxio = NFS_MAXDATA; 497 } else 498 #endif 499 maxio = NFS_V2MAXDATA; 500 501 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 502 int osize = nmp->nm_wsize; 503 nmp->nm_wsize = argp->wsize; 504 /* Round down to multiple of blocksize */ 505 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 506 if (nmp->nm_wsize <= 0) 507 nmp->nm_wsize = NFS_FABLKSIZE; 508 adjsock |= (nmp->nm_wsize != osize); 509 } 510 if (nmp->nm_wsize > maxio) 511 nmp->nm_wsize = maxio; 512 if (nmp->nm_wsize > MAXBSIZE) 513 nmp->nm_wsize = MAXBSIZE; 514 515 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 516 int osize = nmp->nm_rsize; 517 nmp->nm_rsize = argp->rsize; 518 /* Round down to multiple of blocksize */ 519 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 520 if (nmp->nm_rsize <= 0) 521 nmp->nm_rsize = NFS_FABLKSIZE; 522 adjsock |= (nmp->nm_rsize != osize); 523 } 524 if (nmp->nm_rsize > maxio) 525 nmp->nm_rsize = maxio; 526 if (nmp->nm_rsize > MAXBSIZE) 527 nmp->nm_rsize = MAXBSIZE; 528 529 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 530 nmp->nm_readdirsize = argp->readdirsize; 531 /* Round down to multiple of minimum blocksize */ 532 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 533 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 534 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 535 /* Bigger than buffer size makes no sense */ 536 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 537 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 538 } else if (argp->flags & NFSMNT_RSIZE) 539 nmp->nm_readdirsize = nmp->nm_rsize; 540 541 if (nmp->nm_readdirsize > maxio) 542 nmp->nm_readdirsize = maxio; 543 544 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 545 argp->maxgrouplist <= NFS_MAXGRPS) 546 nmp->nm_numgrps = argp->maxgrouplist; 547 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 548 argp->readahead <= NFS_MAXRAHEAD) 549 nmp->nm_readahead = argp->readahead; 550 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 551 argp->deadthresh <= NFS_NEVERDEAD) 552 nmp->nm_deadthresh = argp->deadthresh; 553 554 adjsock |= ((nmp->nm_sotype != argp->sotype) || 555 (nmp->nm_soproto != argp->proto)); 556 nmp->nm_sotype = argp->sotype; 557 nmp->nm_soproto = argp->proto; 558 559 if (nmp->nm_so && adjsock) { 560 nfs_safedisconnect(nmp); 561 if (nmp->nm_sotype == SOCK_DGRAM) 562 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 563 printf("nfs_args: retrying connect\n"); 564 kpause("nfscn3", false, hz, NULL); 565 } 566 } 567 } 568 569 /* 570 * VFS Operations. 571 * 572 * mount system call 573 * It seems a bit dumb to copyinstr() the host and path here and then 574 * memcpy() them in mountnfs(), but I wanted to detect errors before 575 * doing the sockargs() call because sockargs() allocates an mbuf and 576 * an error after that means that I have to release the mbuf. 577 */ 578 /* ARGSUSED */ 579 int 580 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 581 { 582 struct lwp *l = curlwp; 583 int error; 584 struct nfs_args *args = data; 585 struct mbuf *nam; 586 struct nfsmount *nmp = VFSTONFS(mp); 587 struct sockaddr *sa; 588 struct vnode *vp; 589 char *pth, *hst; 590 struct proc *p; 591 size_t len; 592 u_char *nfh; 593 594 if (*data_len < sizeof *args) 595 return EINVAL; 596 597 p = l->l_proc; 598 if (mp->mnt_flag & MNT_GETARGS) { 599 600 if (nmp == NULL) 601 return (EIO); 602 if (args->addr != NULL) { 603 sa = mtod(nmp->nm_nam, struct sockaddr *); 604 error = copyout(sa, args->addr, sa->sa_len); 605 if (error) 606 return (error); 607 args->addrlen = sa->sa_len; 608 } else 609 args->addrlen = 0; 610 611 args->version = NFS_ARGSVERSION; 612 args->sotype = nmp->nm_sotype; 613 args->proto = nmp->nm_soproto; 614 args->fh = NULL; 615 args->fhsize = 0; 616 args->flags = nmp->nm_flag; 617 args->wsize = nmp->nm_wsize; 618 args->rsize = nmp->nm_rsize; 619 args->readdirsize = nmp->nm_readdirsize; 620 args->timeo = nmp->nm_timeo; 621 args->retrans = nmp->nm_retry; 622 args->maxgrouplist = nmp->nm_numgrps; 623 args->readahead = nmp->nm_readahead; 624 args->leaseterm = 0; /* dummy */ 625 args->deadthresh = nmp->nm_deadthresh; 626 args->hostname = NULL; 627 *data_len = sizeof *args; 628 return 0; 629 } 630 631 if (args->version != NFS_ARGSVERSION) 632 return (EPROGMISMATCH); 633 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 634 return (EPROGUNAVAIL); 635 #ifdef NFS_V2_ONLY 636 if (args->flags & NFSMNT_NFSV3) 637 return (EPROGMISMATCH); 638 #endif 639 if (mp->mnt_flag & MNT_UPDATE) { 640 if (nmp == NULL) 641 return (EIO); 642 /* 643 * When doing an update, we can't change from or to 644 * v3, or change cookie translation 645 */ 646 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 647 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 648 nfs_decode_args(nmp, args, l); 649 return (0); 650 } 651 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 652 return (EINVAL); 653 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 654 error = copyin(args->fh, nfh, args->fhsize); 655 if (error) 656 goto free_nfh; 657 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 658 error = copyinstr(path, pth, MNAMELEN - 1, &len); 659 if (error) 660 goto free_pth; 661 memset(&pth[len], 0, MNAMELEN - len); 662 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 663 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 664 if (error) 665 goto free_hst; 666 memset(&hst[len], 0, MNAMELEN - len); 667 /* sockargs() call must be after above copyin() calls */ 668 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 669 if (error) 670 goto free_hst; 671 MCLAIM(nam, &nfs_mowner); 672 args->fh = nfh; 673 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 674 675 free_hst: 676 FREE(hst, M_TEMP); 677 free_pth: 678 FREE(pth, M_TEMP); 679 free_nfh: 680 FREE(nfh, M_TEMP); 681 682 return (error); 683 } 684 685 /* 686 * Common code for mount and mountroot 687 */ 688 int 689 mountnfs(argp, mp, nam, pth, hst, vpp, l) 690 struct nfs_args *argp; 691 struct mount *mp; 692 struct mbuf *nam; 693 const char *pth, *hst; 694 struct vnode **vpp; 695 struct lwp *l; 696 { 697 struct nfsmount *nmp; 698 struct nfsnode *np; 699 int error; 700 struct vattr *attrs; 701 kauth_cred_t cr; 702 char iosname[IOSTATNAMELEN]; 703 704 /* 705 * If the number of nfs iothreads to use has never 706 * been set, create a reasonable number of them. 707 */ 708 709 if (nfs_niothreads < 0) { 710 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 711 } 712 713 if (mp->mnt_flag & MNT_UPDATE) { 714 nmp = VFSTONFS(mp); 715 /* update paths, file handles, etc, here XXX */ 716 m_freem(nam); 717 return (0); 718 } else { 719 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 720 M_NFSMNT, M_WAITOK); 721 memset(nmp, 0, sizeof (struct nfsmount)); 722 mp->mnt_data = nmp; 723 TAILQ_INIT(&nmp->nm_uidlruhead); 724 TAILQ_INIT(&nmp->nm_bufq); 725 rw_init(&nmp->nm_writeverflock); 726 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 727 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 728 cv_init(&nmp->nm_sndcv, "nfssnd"); 729 cv_init(&nmp->nm_aiocv, "nfsaio"); 730 cv_init(&nmp->nm_disconcv, "nfsdis"); 731 } 732 vfs_getnewfsid(mp); 733 nmp->nm_mountp = mp; 734 735 #ifndef NFS_V2_ONLY 736 if ((argp->flags & NFSMNT_NFSV3) == 0) 737 #endif 738 { 739 /* 740 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 741 * will fill this in. 742 */ 743 nmp->nm_maxfilesize = 0xffffffffLL; 744 if (argp->fhsize != NFSX_V2FH) { 745 return EINVAL; 746 } 747 } 748 749 nmp->nm_timeo = NFS_TIMEO; 750 nmp->nm_retry = NFS_RETRANS; 751 nmp->nm_wsize = NFS_WSIZE; 752 nmp->nm_rsize = NFS_RSIZE; 753 nmp->nm_readdirsize = NFS_READDIRSIZE; 754 nmp->nm_numgrps = NFS_MAXGRPS; 755 nmp->nm_readahead = NFS_DEFRAHEAD; 756 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 757 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 758 mp->mnt_op->vfs_name, mp, l); 759 if (error) 760 goto bad; 761 nmp->nm_nam = nam; 762 763 /* Set up the sockets and per-host congestion */ 764 nmp->nm_sotype = argp->sotype; 765 nmp->nm_soproto = argp->proto; 766 767 nfs_decode_args(nmp, argp, l); 768 769 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 770 mp->mnt_dev_bshift = DEV_BSHIFT; 771 772 /* 773 * For Connection based sockets (TCP,...) defer the connect until 774 * the first request, in case the server is not responding. 775 */ 776 if (nmp->nm_sotype == SOCK_DGRAM && 777 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 778 goto bad; 779 780 /* 781 * This is silly, but it has to be set so that vinifod() works. 782 * We do not want to do an nfs_statvfs() here since we can get 783 * stuck on a dead server and we are holding a lock on the mount 784 * point. 785 */ 786 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 787 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 788 if (error) 789 goto bad; 790 *vpp = NFSTOV(np); 791 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 792 VOP_GETATTR(*vpp, attrs, l->l_cred); 793 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 794 cr = kauth_cred_alloc(); 795 kauth_cred_setuid(cr, attrs->va_uid); 796 kauth_cred_seteuid(cr, attrs->va_uid); 797 kauth_cred_setsvuid(cr, attrs->va_uid); 798 kauth_cred_setgid(cr, attrs->va_gid); 799 kauth_cred_setegid(cr, attrs->va_gid); 800 kauth_cred_setsvgid(cr, attrs->va_gid); 801 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 802 kauth_cred_free(cr); 803 } 804 FREE(attrs, M_TEMP); 805 806 /* 807 * A reference count is needed on the nfsnode representing the 808 * remote root. If this object is not persistent, then backward 809 * traversals of the mount point (i.e. "..") will not work if 810 * the nfsnode gets flushed out of the cache. Ufs does not have 811 * this problem, because one can identify root inodes by their 812 * number == ROOTINO (2). So, just unlock, but no rele. 813 */ 814 815 nmp->nm_vnode = *vpp; 816 VOP_UNLOCK(*vpp, 0); 817 818 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 819 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 820 821 return (0); 822 bad: 823 nfs_disconnect(nmp); 824 rw_destroy(&nmp->nm_writeverflock); 825 mutex_destroy(&nmp->nm_lock); 826 cv_destroy(&nmp->nm_rcvcv); 827 cv_destroy(&nmp->nm_sndcv); 828 cv_destroy(&nmp->nm_aiocv); 829 cv_destroy(&nmp->nm_disconcv); 830 free(nmp, M_NFSMNT); 831 m_freem(nam); 832 return (error); 833 } 834 835 /* 836 * unmount system call 837 */ 838 int 839 nfs_unmount(struct mount *mp, int mntflags) 840 { 841 struct nfsmount *nmp; 842 struct vnode *vp; 843 int error, flags = 0; 844 845 if (mntflags & MNT_FORCE) 846 flags |= FORCECLOSE; 847 nmp = VFSTONFS(mp); 848 /* 849 * Goes something like this.. 850 * - Check for activity on the root vnode (other than ourselves). 851 * - Call vflush() to clear out vnodes for this file system, 852 * except for the root vnode. 853 * - Decrement reference on the vnode representing remote root. 854 * - Close the socket 855 * - Free up the data structures 856 */ 857 /* 858 * We need to decrement the ref. count on the nfsnode representing 859 * the remote root. See comment in mountnfs(). The VFS unmount() 860 * has done vput on this vnode, otherwise we would get deadlock! 861 */ 862 vp = nmp->nm_vnode; 863 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 864 if (error != 0) 865 return error; 866 867 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 868 vput(vp); 869 return (EBUSY); 870 } 871 872 error = vflush(mp, vp, flags); 873 if (error) { 874 vput(vp); 875 return (error); 876 } 877 878 /* 879 * We are now committed to the unmount; mark the mount structure 880 * as doomed so that any sleepers kicked awake by nfs_disconnect 881 * will go away cleanly. 882 */ 883 nmp->nm_iflag |= NFSMNT_DISMNT; 884 885 /* 886 * Clean up the stats... note that we carefully avoid decrementing 887 * nfs_mount_count here for good reason - we may not be unmounting 888 * the last thing mounted. 889 */ 890 iostat_free(nmp->nm_stats); 891 892 /* 893 * There are two reference counts to get rid of here 894 * (see comment in mountnfs()). 895 */ 896 vrele(vp); 897 vput(vp); 898 vgone(vp); 899 nfs_disconnect(nmp); 900 m_freem(nmp->nm_nam); 901 902 rw_destroy(&nmp->nm_writeverflock); 903 mutex_destroy(&nmp->nm_lock); 904 cv_destroy(&nmp->nm_rcvcv); 905 cv_destroy(&nmp->nm_sndcv); 906 cv_destroy(&nmp->nm_aiocv); 907 cv_destroy(&nmp->nm_disconcv); 908 free(nmp, M_NFSMNT); 909 return (0); 910 } 911 912 /* 913 * Return root of a filesystem 914 */ 915 int 916 nfs_root(mp, vpp) 917 struct mount *mp; 918 struct vnode **vpp; 919 { 920 struct vnode *vp; 921 struct nfsmount *nmp; 922 int error; 923 924 nmp = VFSTONFS(mp); 925 vp = nmp->nm_vnode; 926 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 927 if (error != 0) 928 return error; 929 if (vp->v_type == VNON) 930 vp->v_type = VDIR; 931 vp->v_vflag = VV_ROOT; 932 *vpp = vp; 933 return (0); 934 } 935 936 extern int syncprt; 937 938 /* 939 * Flush out the buffer cache 940 */ 941 /* ARGSUSED */ 942 int 943 nfs_sync(mp, waitfor, cred) 944 struct mount *mp; 945 int waitfor; 946 kauth_cred_t cred; 947 { 948 struct vnode *vp, *nvp; 949 int error, allerror = 0; 950 951 /* 952 * Force stale buffer cache information to be flushed. 953 */ 954 loop: 955 /* 956 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 957 * and vclean() can be called indirectly 958 */ 959 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = nvp) { 960 /* 961 * If the vnode that we are about to sync is no longer 962 * associated with this mount point, start over. 963 */ 964 if (vp->v_mount != mp) 965 goto loop; 966 nvp = TAILQ_NEXT(vp, v_mntvnodes); 967 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 968 (LIST_EMPTY(&vp->v_dirtyblkhd) && 969 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) 970 continue; 971 if (vget(vp, LK_EXCLUSIVE)) 972 goto loop; 973 error = VOP_FSYNC(vp, cred, 974 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 975 if (error) 976 allerror = error; 977 vput(vp); 978 } 979 return (allerror); 980 } 981 982 /* 983 * NFS flat namespace lookup. 984 * Currently unsupported. 985 */ 986 /* ARGSUSED */ 987 int 988 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 989 { 990 991 return (EOPNOTSUPP); 992 } 993 994 /* 995 * Do that sysctl thang... 996 */ 997 static int 998 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 999 { 1000 struct sysctlnode node; 1001 int val; 1002 int error; 1003 1004 val = nfs_niothreads; 1005 node = *rnode; 1006 node.sysctl_data = &val; 1007 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1008 if (error || newp == NULL) 1009 return error; 1010 1011 return nfs_set_niothreads(val); 1012 } 1013 1014 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1015 { 1016 1017 sysctl_createv(clog, 0, NULL, NULL, 1018 CTLFLAG_PERMANENT, 1019 CTLTYPE_NODE, "vfs", NULL, 1020 NULL, 0, NULL, 0, 1021 CTL_VFS, CTL_EOL); 1022 sysctl_createv(clog, 0, NULL, NULL, 1023 CTLFLAG_PERMANENT, 1024 CTLTYPE_NODE, "nfs", 1025 SYSCTL_DESCR("NFS vfs options"), 1026 NULL, 0, NULL, 0, 1027 CTL_VFS, 2, CTL_EOL); 1028 /* 1029 * XXX the "2" above could be dynamic, thereby eliminating one 1030 * more instance of the "number to vfs" mapping problem, but 1031 * "2" is the order as taken from sys/mount.h 1032 */ 1033 1034 sysctl_createv(clog, 0, NULL, NULL, 1035 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1036 CTLTYPE_STRUCT, "nfsstats", 1037 SYSCTL_DESCR("NFS operation statistics"), 1038 NULL, 0, &nfsstats, sizeof(nfsstats), 1039 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1040 sysctl_createv(clog, 0, NULL, NULL, 1041 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1042 CTLTYPE_INT, "iothreads", 1043 SYSCTL_DESCR("Number of NFS client processes desired"), 1044 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1045 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1046 } 1047 1048 /* ARGSUSED */ 1049 int 1050 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1051 { 1052 size_t fidsize; 1053 size_t fhsize; 1054 struct nfsnode *np; 1055 int error; 1056 struct vattr va; 1057 1058 fidsize = fid->fid_len; 1059 if (fidsize < sizeof(*fid)) { 1060 return EINVAL; 1061 } 1062 fhsize = fidsize - sizeof(*fid); 1063 if ((fhsize % NFSX_UNSIGNED) != 0) { 1064 return EINVAL; 1065 } 1066 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1067 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1068 return EINVAL; 1069 } 1070 } else { 1071 if (fhsize != NFSX_V2FH) { 1072 return EINVAL; 1073 } 1074 } 1075 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1076 if (error) { 1077 return error; 1078 } 1079 *vpp = NFSTOV(np); 1080 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1081 if (error != 0) { 1082 vput(*vpp); 1083 } 1084 return error; 1085 } 1086 1087 /* ARGSUSED */ 1088 int 1089 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1090 { 1091 struct nfsnode *np; 1092 struct fid *fid; 1093 size_t fidsize; 1094 int error = 0; 1095 1096 np = VTONFS(vp); 1097 fidsize = sizeof(*fid) + np->n_fhsize; 1098 if (*bufsize < fidsize) { 1099 error = E2BIG; 1100 } 1101 *bufsize = fidsize; 1102 if (error == 0) { 1103 struct fid fid_store; 1104 1105 fid = &fid_store; 1106 memset(fid, 0, sizeof(*fid)); 1107 fid->fid_len = fidsize; 1108 memcpy(buf, fid, sizeof(*fid)); 1109 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1110 } 1111 return error; 1112 } 1113 1114 /* 1115 * Vfs start routine, a no-op. 1116 */ 1117 /* ARGSUSED */ 1118 int 1119 nfs_start(struct mount *mp, int flags) 1120 { 1121 1122 return (0); 1123 } 1124