1 /* $NetBSD: nfs_vfsops.c,v 1.228 2014/05/24 16:34:04 christos 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 1.228 2014/05/24 16:34:04 christos Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_nfs.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/ioctl.h> 46 #include <sys/signal.h> 47 #include <sys/proc.h> 48 #include <sys/namei.h> 49 #include <sys/device.h> 50 #include <sys/vnode.h> 51 #include <sys/kernel.h> 52 #include <sys/mount.h> 53 #include <sys/buf.h> 54 #include <sys/mbuf.h> 55 #include <sys/dirent.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 #include <sys/timetc.h> 61 #include <sys/kauth.h> 62 #include <sys/module.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 MODULE(MODULE_CLASS_VFS, nfs, NULL); 79 80 extern struct nfsstats nfsstats; 81 extern int nfs_ticks; 82 83 /* 84 * keep a count of the nfs mounts to generate ficticious drive names 85 * for the per drive stats. 86 */ 87 unsigned int nfs_mount_count = 0; 88 89 int nfs_commitsize; 90 91 /* 92 * nfs vfs operations. 93 */ 94 95 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 96 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 97 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 98 99 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 100 &nfsv2_vnodeop_opv_desc, 101 &spec_nfsv2nodeop_opv_desc, 102 &fifo_nfsv2nodeop_opv_desc, 103 NULL, 104 }; 105 106 struct vfsops nfs_vfsops = { 107 .vfs_name = MOUNT_NFS, 108 .vfs_min_mount_data = sizeof (struct nfs_args), 109 .vfs_mount = nfs_mount, 110 .vfs_start = nfs_start, 111 .vfs_unmount = nfs_unmount, 112 .vfs_root = nfs_root, 113 .vfs_quotactl = (void *)eopnotsupp, 114 .vfs_statvfs = nfs_statvfs, 115 .vfs_sync = nfs_sync, 116 .vfs_vget = nfs_vget, 117 .vfs_fhtovp = nfs_fhtovp, 118 .vfs_vptofh = nfs_vptofh, 119 .vfs_init = nfs_vfs_init, 120 .vfs_done = nfs_vfs_done, 121 .vfs_mountroot = nfs_mountroot, 122 .vfs_snapshot = (void *)eopnotsupp, 123 .vfs_extattrctl = vfs_stdextattrctl, 124 .vfs_suspendctl = (void *)eopnotsupp, 125 .vfs_renamelock_enter = genfs_renamelock_enter, 126 .vfs_renamelock_exit = genfs_renamelock_exit, 127 .vfs_fsync = (void *)eopnotsupp, 128 .vfs_opv_descs = nfs_vnodeopv_descs 129 }; 130 131 extern u_int32_t nfs_procids[NFS_NPROCS]; 132 extern u_int32_t nfs_prog, nfs_vers; 133 static struct sysctllog *nfs_clog; 134 135 static int nfs_mount_diskless(struct nfs_dlmount *, const char *, 136 struct mount **, struct vnode **, struct lwp *); 137 static void nfs_sysctl_init(void); 138 static void nfs_sysctl_fini(void); 139 140 static int 141 nfs_modcmd(modcmd_t cmd, void *arg) 142 { 143 int error; 144 145 switch (cmd) { 146 case MODULE_CMD_INIT: 147 error = vfs_attach(&nfs_vfsops); 148 if (error == 0) { 149 nfs_sysctl_init(); 150 } 151 return error; 152 case MODULE_CMD_FINI: 153 error = vfs_detach(&nfs_vfsops); 154 if (error == 0) { 155 nfs_sysctl_fini(); 156 } 157 return error; 158 default: 159 return ENOTTY; 160 } 161 } 162 163 /* 164 * nfs statvfs call 165 */ 166 int 167 nfs_statvfs(struct mount *mp, struct statvfs *sbp) 168 { 169 struct lwp *l = curlwp; 170 struct vnode *vp; 171 struct nfs_statfs *sfp; 172 char *cp; 173 u_int32_t *tl; 174 int32_t t1, t2; 175 char *bpos, *dpos, *cp2; 176 struct nfsmount *nmp = VFSTONFS(mp); 177 int error = 0, retattr; 178 #ifdef NFS_V2_ONLY 179 const int v3 = 0; 180 #else 181 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 182 #endif 183 struct mbuf *mreq, *mrep = NULL, *md, *mb; 184 kauth_cred_t cred; 185 u_quad_t tquad; 186 struct nfsnode *np; 187 188 #ifndef nolint 189 sfp = (struct nfs_statfs *)0; 190 #endif 191 vp = nmp->nm_vnode; 192 np = VTONFS(vp); 193 cred = kauth_cred_alloc(); 194 #ifndef NFS_V2_ONLY 195 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 196 (void)nfs_fsinfo(nmp, vp, cred, l); 197 #endif 198 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 199 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 200 nfsm_fhtom(np, v3); 201 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 202 if (v3) 203 nfsm_postop_attr(vp, retattr, 0); 204 if (error) { 205 if (mrep != NULL) { 206 if (mrep->m_next != NULL) 207 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 208 m_freem(mrep); 209 } 210 goto nfsmout; 211 } 212 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 213 sbp->f_flag = nmp->nm_flag; 214 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 215 if (v3) { 216 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 217 tquad = fxdr_hyper(&sfp->sf_tbytes); 218 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 219 tquad = fxdr_hyper(&sfp->sf_fbytes); 220 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 221 tquad = fxdr_hyper(&sfp->sf_abytes); 222 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 223 sbp->f_bresvd = sbp->f_bfree - tquad; 224 sbp->f_bavail = tquad; 225 /* Handle older NFS servers returning negative values */ 226 if ((quad_t)sbp->f_bavail < 0) 227 sbp->f_bavail = 0; 228 tquad = fxdr_hyper(&sfp->sf_tfiles); 229 sbp->f_files = tquad; 230 tquad = fxdr_hyper(&sfp->sf_ffiles); 231 sbp->f_ffree = tquad; 232 sbp->f_favail = tquad; 233 sbp->f_fresvd = 0; 234 sbp->f_namemax = NFS_MAXNAMLEN; 235 } else { 236 sbp->f_bsize = NFS_FABLKSIZE; 237 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 238 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 239 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 240 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 241 sbp->f_fresvd = 0; 242 sbp->f_files = 0; 243 sbp->f_ffree = 0; 244 sbp->f_favail = 0; 245 sbp->f_fresvd = 0; 246 sbp->f_namemax = NFS_MAXNAMLEN; 247 } 248 copy_statvfs_info(sbp, mp); 249 nfsm_reqdone; 250 kauth_cred_free(cred); 251 return (error); 252 } 253 254 #ifndef NFS_V2_ONLY 255 /* 256 * nfs version 3 fsinfo rpc call 257 */ 258 int 259 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) 260 { 261 struct nfsv3_fsinfo *fsp; 262 char *cp; 263 int32_t t1, t2; 264 u_int32_t *tl, pref, xmax; 265 char *bpos, *dpos, *cp2; 266 int error = 0, retattr; 267 struct mbuf *mreq, *mrep, *md, *mb; 268 u_int64_t maxfsize; 269 struct nfsnode *np = VTONFS(vp); 270 271 nfsstats.rpccnt[NFSPROC_FSINFO]++; 272 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 273 nfsm_fhtom(np, 1); 274 nfsm_request(np, NFSPROC_FSINFO, l, cred); 275 nfsm_postop_attr(vp, retattr, 0); 276 if (!error) { 277 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 278 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 279 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 280 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 281 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 282 ~(NFS_FABLKSIZE - 1); 283 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 284 if (xmax < nmp->nm_wsize && xmax > 0) { 285 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 286 if (nmp->nm_wsize == 0) 287 nmp->nm_wsize = xmax; 288 } 289 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 290 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 291 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 292 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 293 ~(NFS_FABLKSIZE - 1); 294 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 295 if (xmax < nmp->nm_rsize && xmax > 0) { 296 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 297 if (nmp->nm_rsize == 0) 298 nmp->nm_rsize = xmax; 299 } 300 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 301 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 302 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 303 ~(NFS_DIRFRAGSIZ - 1); 304 if (xmax < nmp->nm_readdirsize && xmax > 0) { 305 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 306 if (nmp->nm_readdirsize == 0) 307 nmp->nm_readdirsize = xmax; 308 } 309 /* XXX */ 310 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 311 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 312 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 313 nmp->nm_maxfilesize = maxfsize; 314 nmp->nm_mountp->mnt_fs_bshift = 315 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 316 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 317 } 318 nfsm_reqdone; 319 return (error); 320 } 321 #endif 322 323 /* 324 * Mount a remote root fs via. NFS. It goes like this: 325 * - Call nfs_boot_init() to fill in the nfs_diskless struct 326 * - build the rootfs mount point and call mountnfs() to do the rest. 327 */ 328 int 329 nfs_mountroot(void) 330 { 331 struct timespec ts; 332 struct nfs_diskless *nd; 333 struct vattr attr; 334 struct mount *mp; 335 struct vnode *vp; 336 struct lwp *l; 337 long n; 338 int error; 339 340 l = curlwp; /* XXX */ 341 342 if (device_class(root_device) != DV_IFNET) 343 return (ENODEV); 344 345 /* 346 * XXX time must be non-zero when we init the interface or else 347 * the arp code will wedge. [Fixed now in if_ether.c] 348 * However, the NFS attribute cache gives false "hits" when the 349 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 350 */ 351 if (time_second < NFS_MAXATTRTIMO) { 352 ts.tv_sec = NFS_MAXATTRTIMO; 353 ts.tv_nsec = 0; 354 tc_setclock(&ts); 355 } 356 357 /* 358 * Call nfs_boot_init() to fill in the nfs_diskless struct. 359 * Side effect: Finds and configures a network interface. 360 */ 361 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 362 error = nfs_boot_init(nd, l); 363 if (error) { 364 kmem_free(nd, sizeof(*nd)); 365 return (error); 366 } 367 368 /* 369 * Create the root mount point. 370 */ 371 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 372 if (error) 373 goto out; 374 printf("root on %s\n", nd->nd_root.ndm_host); 375 376 /* 377 * Link it into the mount list. 378 */ 379 mountlist_append(mp); 380 rootvp = vp; 381 mp->mnt_vnodecovered = NULLVP; 382 vfs_unbusy(mp, false, NULL); 383 384 /* Get root attributes (for the time). */ 385 vn_lock(vp, LK_SHARED | LK_RETRY); 386 error = VOP_GETATTR(vp, &attr, l->l_cred); 387 VOP_UNLOCK(vp); 388 if (error) 389 panic("nfs_mountroot: getattr for root"); 390 n = attr.va_atime.tv_sec; 391 #ifdef DEBUG 392 printf("root time: 0x%lx\n", n); 393 #endif 394 setrootfstime(n); 395 396 out: 397 if (error) 398 nfs_boot_cleanup(nd, l); 399 kmem_free(nd, sizeof(*nd)); 400 return (error); 401 } 402 403 /* 404 * Internal version of mount system call for diskless setup. 405 * Separate function because we used to call it twice. 406 * (once for root and once for swap) 407 */ 408 static int 409 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) 410 /* mntname: mount point name */ 411 { 412 struct mount *mp; 413 struct mbuf *m; 414 int error; 415 416 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 417 418 mp->mnt_op = &nfs_vfsops; 419 420 /* 421 * Historical practice expects NFS root file systems to 422 * be initially mounted r/w. 423 */ 424 mp->mnt_flag &= ~MNT_RDONLY; 425 426 /* Get mbuf for server sockaddr. */ 427 m = m_get(M_WAIT, MT_SONAME); 428 if (m == NULL) 429 panic("nfs_mountroot: mget soname for %s", mntname); 430 MCLAIM(m, &nfs_mowner); 431 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 432 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 433 434 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 435 ndmntp->ndm_args.hostname, vpp, l); 436 if (error) { 437 vfs_unbusy(mp, false, NULL); 438 vfs_destroy(mp); 439 printf("nfs_mountroot: mount %s failed: %d\n", 440 mntname, error); 441 } else 442 *mpp = mp; 443 444 return (error); 445 } 446 447 void 448 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) 449 { 450 int s; 451 int adjsock; 452 int maxio; 453 454 s = splsoftnet(); 455 456 /* 457 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 458 * no sense in that context. 459 */ 460 if (argp->sotype == SOCK_STREAM) 461 argp->flags &= ~NFSMNT_NOCONN; 462 463 /* 464 * Cookie translation is not needed for v2, silently ignore it. 465 */ 466 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 467 NFSMNT_XLATECOOKIE) 468 argp->flags &= ~NFSMNT_XLATECOOKIE; 469 470 /* Re-bind if rsrvd port requested and wasn't on one */ 471 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 472 && (argp->flags & NFSMNT_RESVPORT); 473 /* Also re-bind if we're switching to/from a connected UDP socket */ 474 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 475 (argp->flags & NFSMNT_NOCONN)); 476 477 /* Update flags. */ 478 nmp->nm_flag = argp->flags; 479 splx(s); 480 481 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 482 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 483 if (nmp->nm_timeo < NFS_MINTIMEO) 484 nmp->nm_timeo = NFS_MINTIMEO; 485 else if (nmp->nm_timeo > NFS_MAXTIMEO) 486 nmp->nm_timeo = NFS_MAXTIMEO; 487 } 488 489 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 490 nmp->nm_retry = argp->retrans; 491 if (nmp->nm_retry > NFS_MAXREXMIT) 492 nmp->nm_retry = NFS_MAXREXMIT; 493 } 494 495 #ifndef NFS_V2_ONLY 496 if (argp->flags & NFSMNT_NFSV3) { 497 if (argp->sotype == SOCK_DGRAM) 498 maxio = NFS_MAXDGRAMDATA; 499 else 500 maxio = NFS_MAXDATA; 501 } else 502 #endif 503 maxio = NFS_V2MAXDATA; 504 505 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 506 int osize = nmp->nm_wsize; 507 nmp->nm_wsize = argp->wsize; 508 /* Round down to multiple of blocksize */ 509 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 510 if (nmp->nm_wsize <= 0) 511 nmp->nm_wsize = NFS_FABLKSIZE; 512 adjsock |= (nmp->nm_wsize != osize); 513 } 514 if (nmp->nm_wsize > maxio) 515 nmp->nm_wsize = maxio; 516 if (nmp->nm_wsize > MAXBSIZE) 517 nmp->nm_wsize = MAXBSIZE; 518 519 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 520 int osize = nmp->nm_rsize; 521 nmp->nm_rsize = argp->rsize; 522 /* Round down to multiple of blocksize */ 523 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 524 if (nmp->nm_rsize <= 0) 525 nmp->nm_rsize = NFS_FABLKSIZE; 526 adjsock |= (nmp->nm_rsize != osize); 527 } 528 if (nmp->nm_rsize > maxio) 529 nmp->nm_rsize = maxio; 530 if (nmp->nm_rsize > MAXBSIZE) 531 nmp->nm_rsize = MAXBSIZE; 532 533 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 534 nmp->nm_readdirsize = argp->readdirsize; 535 /* Round down to multiple of minimum blocksize */ 536 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 537 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 538 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 539 /* Bigger than buffer size makes no sense */ 540 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 541 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 542 } else if (argp->flags & NFSMNT_RSIZE) 543 nmp->nm_readdirsize = nmp->nm_rsize; 544 545 if (nmp->nm_readdirsize > maxio) 546 nmp->nm_readdirsize = maxio; 547 548 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 549 argp->maxgrouplist <= NFS_MAXGRPS) 550 nmp->nm_numgrps = argp->maxgrouplist; 551 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 552 argp->readahead <= NFS_MAXRAHEAD) 553 nmp->nm_readahead = argp->readahead; 554 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 555 argp->deadthresh <= NFS_NEVERDEAD) 556 nmp->nm_deadthresh = argp->deadthresh; 557 558 adjsock |= ((nmp->nm_sotype != argp->sotype) || 559 (nmp->nm_soproto != argp->proto)); 560 nmp->nm_sotype = argp->sotype; 561 nmp->nm_soproto = argp->proto; 562 563 if (nmp->nm_so && adjsock) { 564 nfs_safedisconnect(nmp); 565 if (nmp->nm_sotype == SOCK_DGRAM) 566 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 567 printf("nfs_args: retrying connect\n"); 568 kpause("nfscn3", false, hz, NULL); 569 } 570 } 571 } 572 573 /* 574 * VFS Operations. 575 * 576 * mount system call 577 * It seems a bit dumb to copyinstr() the host and path here and then 578 * memcpy() them in mountnfs(), but I wanted to detect errors before 579 * doing the sockargs() call because sockargs() allocates an mbuf and 580 * an error after that means that I have to release the mbuf. 581 */ 582 /* ARGSUSED */ 583 int 584 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 585 { 586 struct lwp *l = curlwp; 587 int error; 588 struct nfs_args *args = data; 589 struct mbuf *nam; 590 struct nfsmount *nmp = VFSTONFS(mp); 591 struct sockaddr *sa; 592 struct vnode *vp; 593 char *pth, *hst; 594 size_t len; 595 u_char *nfh; 596 597 if (args == NULL) 598 return EINVAL; 599 if (*data_len < sizeof *args) 600 return EINVAL; 601 602 if (mp->mnt_flag & MNT_GETARGS) { 603 604 if (nmp == NULL) 605 return (EIO); 606 if (args->addr != NULL) { 607 sa = mtod(nmp->nm_nam, struct sockaddr *); 608 error = copyout(sa, args->addr, sa->sa_len); 609 if (error) 610 return (error); 611 args->addrlen = sa->sa_len; 612 } else 613 args->addrlen = 0; 614 615 args->version = NFS_ARGSVERSION; 616 args->sotype = nmp->nm_sotype; 617 args->proto = nmp->nm_soproto; 618 args->fh = NULL; 619 args->fhsize = 0; 620 args->flags = nmp->nm_flag; 621 args->wsize = nmp->nm_wsize; 622 args->rsize = nmp->nm_rsize; 623 args->readdirsize = nmp->nm_readdirsize; 624 args->timeo = nmp->nm_timeo; 625 args->retrans = nmp->nm_retry; 626 args->maxgrouplist = nmp->nm_numgrps; 627 args->readahead = nmp->nm_readahead; 628 args->leaseterm = 0; /* dummy */ 629 args->deadthresh = nmp->nm_deadthresh; 630 args->hostname = NULL; 631 *data_len = sizeof *args; 632 return 0; 633 } 634 635 if (args->version != NFS_ARGSVERSION) 636 return (EPROGMISMATCH); 637 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 638 return (EPROGUNAVAIL); 639 #ifdef NFS_V2_ONLY 640 if (args->flags & NFSMNT_NFSV3) 641 return (EPROGMISMATCH); 642 #endif 643 if (mp->mnt_flag & MNT_UPDATE) { 644 if (nmp == NULL) 645 return (EIO); 646 /* 647 * When doing an update, we can't change from or to 648 * v3, or change cookie translation 649 */ 650 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 651 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 652 nfs_decode_args(nmp, args, l); 653 return (0); 654 } 655 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 656 return (EINVAL); 657 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 658 error = copyin(args->fh, nfh, args->fhsize); 659 if (error) 660 goto free_nfh; 661 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 662 error = copyinstr(path, pth, MNAMELEN - 1, &len); 663 if (error) 664 goto free_pth; 665 memset(&pth[len], 0, MNAMELEN - len); 666 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 667 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 668 if (error) 669 goto free_hst; 670 memset(&hst[len], 0, MNAMELEN - len); 671 /* sockargs() call must be after above copyin() calls */ 672 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 673 if (error) 674 goto free_hst; 675 MCLAIM(nam, &nfs_mowner); 676 args->fh = nfh; 677 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 678 679 free_hst: 680 free(hst, M_TEMP); 681 free_pth: 682 free(pth, M_TEMP); 683 free_nfh: 684 free(nfh, M_TEMP); 685 686 return (error); 687 } 688 689 /* 690 * Common code for mount and mountroot 691 */ 692 int 693 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) 694 { 695 struct nfsmount *nmp; 696 struct nfsnode *np; 697 struct vnode *vp; 698 int error; 699 struct vattr *attrs; 700 kauth_cred_t cr; 701 char iosname[IOSTATNAMELEN]; 702 703 /* 704 * If the number of nfs iothreads to use has never 705 * been set, create a reasonable number of them. 706 */ 707 708 if (nfs_niothreads < 0) { 709 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 710 } 711 712 if (mp->mnt_flag & MNT_UPDATE) { 713 nmp = VFSTONFS(mp); 714 /* update paths, file handles, etc, here XXX */ 715 m_freem(nam); 716 return (0); 717 } else { 718 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 719 mp->mnt_data = nmp; 720 TAILQ_INIT(&nmp->nm_uidlruhead); 721 TAILQ_INIT(&nmp->nm_bufq); 722 rw_init(&nmp->nm_writeverflock); 723 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 724 rw_init(&nmp->nm_rbtlock); 725 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 726 cv_init(&nmp->nm_sndcv, "nfssnd"); 727 cv_init(&nmp->nm_aiocv, "nfsaio"); 728 cv_init(&nmp->nm_disconcv, "nfsdis"); 729 nfs_rbtinit(nmp); 730 } 731 vfs_getnewfsid(mp); 732 nmp->nm_mountp = mp; 733 734 #ifndef NFS_V2_ONLY 735 if ((argp->flags & NFSMNT_NFSV3) == 0) 736 #endif 737 { 738 if (argp->fhsize != NFSX_V2FH) { 739 return EINVAL; 740 } 741 } 742 743 /* 744 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 745 * will overwrite this. 746 */ 747 nmp->nm_maxfilesize = 0xffffffffLL; 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 vp = NFSTOV(np); 791 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 792 VOP_GETATTR(vp, attrs, l->l_cred); 793 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->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(vp, &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 == UFS_ROOTINO (2). So, just unlock, but no rele. 813 */ 814 815 nmp->nm_vnode = vp; 816 if (vp->v_type == VNON) 817 vp->v_type = VDIR; 818 vp->v_vflag |= VV_ROOT; 819 VOP_UNLOCK(vp); 820 *vpp = vp; 821 822 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 823 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 824 825 return (0); 826 bad: 827 nfs_disconnect(nmp); 828 rw_destroy(&nmp->nm_writeverflock); 829 rw_destroy(&nmp->nm_rbtlock); 830 mutex_destroy(&nmp->nm_lock); 831 cv_destroy(&nmp->nm_rcvcv); 832 cv_destroy(&nmp->nm_sndcv); 833 cv_destroy(&nmp->nm_aiocv); 834 cv_destroy(&nmp->nm_disconcv); 835 kmem_free(nmp, sizeof(*nmp)); 836 m_freem(nam); 837 return (error); 838 } 839 840 /* 841 * unmount system call 842 */ 843 int 844 nfs_unmount(struct mount *mp, int mntflags) 845 { 846 struct nfsmount *nmp; 847 struct vnode *vp; 848 int error, flags = 0; 849 850 if (mntflags & MNT_FORCE) 851 flags |= FORCECLOSE; 852 nmp = VFSTONFS(mp); 853 /* 854 * Goes something like this.. 855 * - Check for activity on the root vnode (other than ourselves). 856 * - Call vflush() to clear out vnodes for this file system, 857 * except for the root vnode. 858 * - Decrement reference on the vnode representing remote root. 859 * - Close the socket 860 * - Free up the data structures 861 */ 862 /* 863 * We need to decrement the ref. count on the nfsnode representing 864 * the remote root. See comment in mountnfs(). 865 */ 866 vp = nmp->nm_vnode; 867 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 868 if (error != 0) 869 return error; 870 871 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) { 872 VOP_UNLOCK(vp); 873 return (EBUSY); 874 } 875 876 error = vflush(mp, vp, flags); 877 if (error) { 878 VOP_UNLOCK(vp); 879 return (error); 880 } 881 882 /* 883 * We are now committed to the unmount; mark the mount structure 884 * as doomed so that any sleepers kicked awake by nfs_disconnect 885 * will go away cleanly. 886 */ 887 nmp->nm_iflag |= NFSMNT_DISMNT; 888 889 /* 890 * Clean up the stats... note that we carefully avoid decrementing 891 * nfs_mount_count here for good reason - we may not be unmounting 892 * the last thing mounted. 893 */ 894 iostat_free(nmp->nm_stats); 895 896 /* 897 * There is one reference count to get rid of here 898 * (see comment in mountnfs()). 899 */ 900 VOP_UNLOCK(vp); 901 vgone(vp); 902 nfs_disconnect(nmp); 903 m_freem(nmp->nm_nam); 904 905 rw_destroy(&nmp->nm_writeverflock); 906 rw_destroy(&nmp->nm_rbtlock); 907 mutex_destroy(&nmp->nm_lock); 908 cv_destroy(&nmp->nm_rcvcv); 909 cv_destroy(&nmp->nm_sndcv); 910 cv_destroy(&nmp->nm_aiocv); 911 cv_destroy(&nmp->nm_disconcv); 912 kmem_free(nmp, sizeof(*nmp)); 913 return (0); 914 } 915 916 /* 917 * Return root of a filesystem 918 */ 919 int 920 nfs_root(struct mount *mp, struct vnode **vpp) 921 { 922 struct vnode *vp; 923 struct nfsmount *nmp; 924 int error; 925 926 nmp = VFSTONFS(mp); 927 vp = nmp->nm_vnode; 928 vref(vp); 929 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 930 if (error != 0) { 931 vrele(vp); 932 return error; 933 } 934 *vpp = vp; 935 return (0); 936 } 937 938 extern int syncprt; 939 940 static bool 941 nfs_sync_selector(void *cl, struct vnode *vp) 942 { 943 944 return !LIST_EMPTY(&vp->v_dirtyblkhd) || !UVM_OBJ_IS_CLEAN(&vp->v_uobj); 945 } 946 947 /* 948 * Flush out the buffer cache 949 */ 950 /* ARGSUSED */ 951 int 952 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 953 { 954 struct vnode *vp; 955 struct vnode_iterator *marker; 956 int error, allerror = 0; 957 958 /* 959 * Force stale buffer cache information to be flushed. 960 */ 961 vfs_vnode_iterator_init(mp, &marker); 962 while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector, 963 NULL))) 964 { 965 error = vn_lock(vp, LK_EXCLUSIVE); 966 if (error) { 967 vrele(vp); 968 continue; 969 } 970 error = VOP_FSYNC(vp, cred, 971 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 972 if (error) 973 allerror = error; 974 vput(vp); 975 } 976 vfs_vnode_iterator_destroy(marker); 977 return allerror; 978 } 979 980 /* 981 * NFS flat namespace lookup. 982 * Currently unsupported. 983 */ 984 /* ARGSUSED */ 985 int 986 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 987 { 988 989 return (EOPNOTSUPP); 990 } 991 992 /* 993 * Do that sysctl thang... 994 */ 995 static int 996 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 997 { 998 struct sysctlnode node; 999 int val; 1000 int error; 1001 1002 val = nfs_niothreads; 1003 node = *rnode; 1004 node.sysctl_data = &val; 1005 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1006 if (error || newp == NULL) 1007 return error; 1008 1009 return nfs_set_niothreads(val); 1010 } 1011 1012 static void 1013 nfs_sysctl_init(void) 1014 { 1015 1016 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1017 CTLFLAG_PERMANENT, 1018 CTLTYPE_NODE, "nfs", 1019 SYSCTL_DESCR("NFS vfs options"), 1020 NULL, 0, NULL, 0, 1021 CTL_VFS, 2, CTL_EOL); 1022 /* 1023 * XXX the "2" above could be dynamic, thereby eliminating one 1024 * more instance of the "number to vfs" mapping problem, but 1025 * "2" is the order as taken from sys/mount.h 1026 */ 1027 1028 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1029 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1030 CTLTYPE_STRUCT, "nfsstats", 1031 SYSCTL_DESCR("NFS operation statistics"), 1032 NULL, 0, &nfsstats, sizeof(nfsstats), 1033 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1034 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1035 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1036 CTLTYPE_INT, "iothreads", 1037 SYSCTL_DESCR("Number of NFS client processes desired"), 1038 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1039 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1040 } 1041 1042 static void 1043 nfs_sysctl_fini(void) 1044 { 1045 1046 sysctl_teardown(&nfs_clog); 1047 } 1048 1049 /* ARGSUSED */ 1050 int 1051 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1052 { 1053 size_t fidsize; 1054 size_t fhsize; 1055 struct nfsnode *np; 1056 int error; 1057 struct vattr va; 1058 1059 fidsize = fid->fid_len; 1060 if (fidsize < sizeof(*fid)) { 1061 return EINVAL; 1062 } 1063 fhsize = fidsize - sizeof(*fid); 1064 if ((fhsize % NFSX_UNSIGNED) != 0) { 1065 return EINVAL; 1066 } 1067 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1068 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1069 return EINVAL; 1070 } 1071 } else { 1072 if (fhsize != NFSX_V2FH) { 1073 return EINVAL; 1074 } 1075 } 1076 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1077 if (error) { 1078 return error; 1079 } 1080 *vpp = NFSTOV(np); 1081 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1082 if (error != 0) { 1083 vput(*vpp); 1084 *vpp = NULLVP; 1085 } 1086 return error; 1087 } 1088 1089 /* ARGSUSED */ 1090 int 1091 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1092 { 1093 struct nfsnode *np; 1094 struct fid *fid; 1095 size_t fidsize; 1096 int error = 0; 1097 1098 np = VTONFS(vp); 1099 fidsize = sizeof(*fid) + np->n_fhsize; 1100 if (*bufsize < fidsize) { 1101 error = E2BIG; 1102 } 1103 *bufsize = fidsize; 1104 if (error == 0) { 1105 struct fid fid_store; 1106 1107 fid = &fid_store; 1108 memset(fid, 0, sizeof(*fid)); 1109 fid->fid_len = fidsize; 1110 memcpy(buf, fid, sizeof(*fid)); 1111 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1112 } 1113 return error; 1114 } 1115 1116 /* 1117 * Vfs start routine, a no-op. 1118 */ 1119 /* ARGSUSED */ 1120 int 1121 nfs_start(struct mount *mp, int flags) 1122 { 1123 1124 return (0); 1125 } 1126 1127 /* 1128 * Called once at VFS init to initialize client-specific data structures. 1129 */ 1130 void 1131 nfs_vfs_init(void) 1132 { 1133 1134 /* Initialize NFS server / client shared data. */ 1135 nfs_init(); 1136 nfs_node_init(); 1137 1138 /* Initialize the kqueue structures */ 1139 nfs_kqinit(); 1140 /* Initialize the iod structures */ 1141 nfs_iodinit(); 1142 1143 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); 1144 } 1145 1146 void 1147 nfs_vfs_done(void) 1148 { 1149 1150 nfs_node_done(); 1151 nfs_kqfini(); 1152 nfs_iodfini(); 1153 } 1154