nfs_vfsops.c revision 1.220.14.1
1 /* $NetBSD: nfs_vfsops.c,v 1.220.14.1 2014/04/21 10:15:36 bouyer 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 1.220.14.1 2014/04/21 10:15:36 bouyer 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 MOUNT_NFS, 108 sizeof (struct nfs_args), 109 nfs_mount, 110 nfs_start, 111 nfs_unmount, 112 nfs_root, 113 (void *)eopnotsupp, /* vfs_quotactl */ 114 nfs_statvfs, 115 nfs_sync, 116 nfs_vget, 117 nfs_fhtovp, 118 nfs_vptofh, 119 nfs_vfs_init, 120 NULL, 121 nfs_vfs_done, 122 nfs_mountroot, 123 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 124 vfs_stdextattrctl, 125 (void *)eopnotsupp, /* vfs_suspendctl */ 126 genfs_renamelock_enter, 127 genfs_renamelock_exit, 128 (void *)eopnotsupp, 129 nfs_vnodeopv_descs, 130 0, 131 { NULL, NULL }, 132 }; 133 134 extern u_int32_t nfs_procids[NFS_NPROCS]; 135 extern u_int32_t nfs_prog, nfs_vers; 136 static struct sysctllog *nfs_clog; 137 138 static int nfs_mount_diskless(struct nfs_dlmount *, const char *, 139 struct mount **, struct vnode **, struct lwp *); 140 static void nfs_sysctl_init(void); 141 static void nfs_sysctl_fini(void); 142 143 static int 144 nfs_modcmd(modcmd_t cmd, void *arg) 145 { 146 int error; 147 148 switch (cmd) { 149 case MODULE_CMD_INIT: 150 error = vfs_attach(&nfs_vfsops); 151 if (error == 0) { 152 nfs_sysctl_init(); 153 } 154 return error; 155 case MODULE_CMD_FINI: 156 error = vfs_detach(&nfs_vfsops); 157 if (error == 0) { 158 nfs_sysctl_fini(); 159 } 160 return error; 161 default: 162 return ENOTTY; 163 } 164 } 165 166 /* 167 * nfs statvfs call 168 */ 169 int 170 nfs_statvfs(struct mount *mp, struct statvfs *sbp) 171 { 172 struct lwp *l = curlwp; 173 struct vnode *vp; 174 struct nfs_statfs *sfp; 175 char *cp; 176 u_int32_t *tl; 177 int32_t t1, t2; 178 char *bpos, *dpos, *cp2; 179 struct nfsmount *nmp = VFSTONFS(mp); 180 int error = 0, retattr; 181 #ifdef NFS_V2_ONLY 182 const int v3 = 0; 183 #else 184 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 185 #endif 186 struct mbuf *mreq, *mrep = NULL, *md, *mb; 187 kauth_cred_t cred; 188 u_quad_t tquad; 189 struct nfsnode *np; 190 191 #ifndef nolint 192 sfp = (struct nfs_statfs *)0; 193 #endif 194 vp = nmp->nm_vnode; 195 np = VTONFS(vp); 196 cred = kauth_cred_alloc(); 197 #ifndef NFS_V2_ONLY 198 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 199 (void)nfs_fsinfo(nmp, vp, cred, l); 200 #endif 201 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 202 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 203 nfsm_fhtom(np, v3); 204 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 205 if (v3) 206 nfsm_postop_attr(vp, retattr, 0); 207 if (error) { 208 if (mrep != NULL) { 209 if (mrep->m_next != NULL) 210 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 211 m_freem(mrep); 212 } 213 goto nfsmout; 214 } 215 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 216 sbp->f_flag = nmp->nm_flag; 217 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 218 if (v3) { 219 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 220 tquad = fxdr_hyper(&sfp->sf_tbytes); 221 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 222 tquad = fxdr_hyper(&sfp->sf_fbytes); 223 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 224 tquad = fxdr_hyper(&sfp->sf_abytes); 225 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 226 sbp->f_bresvd = sbp->f_bfree - tquad; 227 sbp->f_bavail = tquad; 228 /* Handle older NFS servers returning negative values */ 229 if ((quad_t)sbp->f_bavail < 0) 230 sbp->f_bavail = 0; 231 tquad = fxdr_hyper(&sfp->sf_tfiles); 232 sbp->f_files = tquad; 233 tquad = fxdr_hyper(&sfp->sf_ffiles); 234 sbp->f_ffree = tquad; 235 sbp->f_favail = tquad; 236 sbp->f_fresvd = 0; 237 sbp->f_namemax = NFS_MAXNAMLEN; 238 } else { 239 sbp->f_bsize = NFS_FABLKSIZE; 240 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 241 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 242 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 243 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 244 sbp->f_fresvd = 0; 245 sbp->f_files = 0; 246 sbp->f_ffree = 0; 247 sbp->f_favail = 0; 248 sbp->f_fresvd = 0; 249 sbp->f_namemax = NFS_MAXNAMLEN; 250 } 251 copy_statvfs_info(sbp, mp); 252 nfsm_reqdone; 253 kauth_cred_free(cred); 254 return (error); 255 } 256 257 #ifndef NFS_V2_ONLY 258 /* 259 * nfs version 3 fsinfo rpc call 260 */ 261 int 262 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) 263 { 264 struct nfsv3_fsinfo *fsp; 265 char *cp; 266 int32_t t1, t2; 267 u_int32_t *tl, pref, xmax; 268 char *bpos, *dpos, *cp2; 269 int error = 0, retattr; 270 struct mbuf *mreq, *mrep, *md, *mb; 271 u_int64_t maxfsize; 272 struct nfsnode *np = VTONFS(vp); 273 274 nfsstats.rpccnt[NFSPROC_FSINFO]++; 275 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 276 nfsm_fhtom(np, 1); 277 nfsm_request(np, NFSPROC_FSINFO, l, cred); 278 nfsm_postop_attr(vp, retattr, 0); 279 if (!error) { 280 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 281 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 282 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 283 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 284 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 285 ~(NFS_FABLKSIZE - 1); 286 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 287 if (xmax < nmp->nm_wsize && xmax > 0) { 288 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 289 if (nmp->nm_wsize == 0) 290 nmp->nm_wsize = xmax; 291 } 292 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 293 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 294 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 295 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 296 ~(NFS_FABLKSIZE - 1); 297 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 298 if (xmax < nmp->nm_rsize && xmax > 0) { 299 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 300 if (nmp->nm_rsize == 0) 301 nmp->nm_rsize = xmax; 302 } 303 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 304 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 305 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 306 ~(NFS_DIRFRAGSIZ - 1); 307 if (xmax < nmp->nm_readdirsize && xmax > 0) { 308 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 309 if (nmp->nm_readdirsize == 0) 310 nmp->nm_readdirsize = xmax; 311 } 312 /* XXX */ 313 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 314 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 315 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 316 nmp->nm_maxfilesize = maxfsize; 317 nmp->nm_mountp->mnt_fs_bshift = 318 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 319 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 320 } 321 nfsm_reqdone; 322 return (error); 323 } 324 #endif 325 326 /* 327 * Mount a remote root fs via. NFS. It goes like this: 328 * - Call nfs_boot_init() to fill in the nfs_diskless struct 329 * - build the rootfs mount point and call mountnfs() to do the rest. 330 */ 331 int 332 nfs_mountroot(void) 333 { 334 struct timespec ts; 335 struct nfs_diskless *nd; 336 struct vattr attr; 337 struct mount *mp; 338 struct vnode *vp; 339 struct lwp *l; 340 long n; 341 int error; 342 343 l = curlwp; /* XXX */ 344 345 if (device_class(root_device) != DV_IFNET) 346 return (ENODEV); 347 348 /* 349 * XXX time must be non-zero when we init the interface or else 350 * the arp code will wedge. [Fixed now in if_ether.c] 351 * However, the NFS attribute cache gives false "hits" when the 352 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 353 */ 354 if (time_second < NFS_MAXATTRTIMO) { 355 ts.tv_sec = NFS_MAXATTRTIMO; 356 ts.tv_nsec = 0; 357 tc_setclock(&ts); 358 } 359 360 /* 361 * Call nfs_boot_init() to fill in the nfs_diskless struct. 362 * Side effect: Finds and configures a network interface. 363 */ 364 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 365 error = nfs_boot_init(nd, l); 366 if (error) { 367 kmem_free(nd, sizeof(*nd)); 368 return (error); 369 } 370 371 /* 372 * Create the root mount point. 373 */ 374 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 375 if (error) 376 goto out; 377 printf("root on %s\n", nd->nd_root.ndm_host); 378 379 /* 380 * Link it into the mount list. 381 */ 382 mutex_enter(&mountlist_lock); 383 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 384 mutex_exit(&mountlist_lock); 385 rootvp = vp; 386 mp->mnt_vnodecovered = NULLVP; 387 vfs_unbusy(mp, false, NULL); 388 389 /* Get root attributes (for the time). */ 390 vn_lock(vp, LK_SHARED | LK_RETRY); 391 error = VOP_GETATTR(vp, &attr, l->l_cred); 392 VOP_UNLOCK(vp); 393 if (error) 394 panic("nfs_mountroot: getattr for root"); 395 n = attr.va_atime.tv_sec; 396 #ifdef DEBUG 397 printf("root time: 0x%lx\n", n); 398 #endif 399 setrootfstime(n); 400 401 out: 402 if (error) 403 nfs_boot_cleanup(nd, l); 404 kmem_free(nd, sizeof(*nd)); 405 return (error); 406 } 407 408 /* 409 * Internal version of mount system call for diskless setup. 410 * Separate function because we used to call it twice. 411 * (once for root and once for swap) 412 */ 413 static int 414 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) 415 /* mntname: mount point name */ 416 { 417 struct mount *mp; 418 struct mbuf *m; 419 int error; 420 421 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 422 423 mp->mnt_op = &nfs_vfsops; 424 425 /* 426 * Historical practice expects NFS root file systems to 427 * be initially mounted r/w. 428 */ 429 mp->mnt_flag &= ~MNT_RDONLY; 430 431 /* Get mbuf for server sockaddr. */ 432 m = m_get(M_WAIT, MT_SONAME); 433 if (m == NULL) 434 panic("nfs_mountroot: mget soname for %s", mntname); 435 MCLAIM(m, &nfs_mowner); 436 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 437 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 438 439 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 440 ndmntp->ndm_args.hostname, vpp, l); 441 if (error) { 442 vfs_unbusy(mp, false, NULL); 443 vfs_destroy(mp); 444 printf("nfs_mountroot: mount %s failed: %d\n", 445 mntname, error); 446 } else 447 *mpp = mp; 448 449 return (error); 450 } 451 452 void 453 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) 454 { 455 int s; 456 int adjsock; 457 int maxio; 458 459 s = splsoftnet(); 460 461 /* 462 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 463 * no sense in that context. 464 */ 465 if (argp->sotype == SOCK_STREAM) 466 argp->flags &= ~NFSMNT_NOCONN; 467 468 /* 469 * Cookie translation is not needed for v2, silently ignore it. 470 */ 471 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 472 NFSMNT_XLATECOOKIE) 473 argp->flags &= ~NFSMNT_XLATECOOKIE; 474 475 /* Re-bind if rsrvd port requested and wasn't on one */ 476 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 477 && (argp->flags & NFSMNT_RESVPORT); 478 /* Also re-bind if we're switching to/from a connected UDP socket */ 479 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 480 (argp->flags & NFSMNT_NOCONN)); 481 482 /* Update flags. */ 483 nmp->nm_flag = argp->flags; 484 splx(s); 485 486 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 487 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 488 if (nmp->nm_timeo < NFS_MINTIMEO) 489 nmp->nm_timeo = NFS_MINTIMEO; 490 else if (nmp->nm_timeo > NFS_MAXTIMEO) 491 nmp->nm_timeo = NFS_MAXTIMEO; 492 } 493 494 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 495 nmp->nm_retry = argp->retrans; 496 if (nmp->nm_retry > NFS_MAXREXMIT) 497 nmp->nm_retry = NFS_MAXREXMIT; 498 } 499 500 #ifndef NFS_V2_ONLY 501 if (argp->flags & NFSMNT_NFSV3) { 502 if (argp->sotype == SOCK_DGRAM) 503 maxio = NFS_MAXDGRAMDATA; 504 else 505 maxio = NFS_MAXDATA; 506 } else 507 #endif 508 maxio = NFS_V2MAXDATA; 509 510 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 511 int osize = nmp->nm_wsize; 512 nmp->nm_wsize = argp->wsize; 513 /* Round down to multiple of blocksize */ 514 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 515 if (nmp->nm_wsize <= 0) 516 nmp->nm_wsize = NFS_FABLKSIZE; 517 adjsock |= (nmp->nm_wsize != osize); 518 } 519 if (nmp->nm_wsize > maxio) 520 nmp->nm_wsize = maxio; 521 if (nmp->nm_wsize > MAXBSIZE) 522 nmp->nm_wsize = MAXBSIZE; 523 524 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 525 int osize = nmp->nm_rsize; 526 nmp->nm_rsize = argp->rsize; 527 /* Round down to multiple of blocksize */ 528 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 529 if (nmp->nm_rsize <= 0) 530 nmp->nm_rsize = NFS_FABLKSIZE; 531 adjsock |= (nmp->nm_rsize != osize); 532 } 533 if (nmp->nm_rsize > maxio) 534 nmp->nm_rsize = maxio; 535 if (nmp->nm_rsize > MAXBSIZE) 536 nmp->nm_rsize = MAXBSIZE; 537 538 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 539 nmp->nm_readdirsize = argp->readdirsize; 540 /* Round down to multiple of minimum blocksize */ 541 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 542 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 543 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 544 /* Bigger than buffer size makes no sense */ 545 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 546 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 547 } else if (argp->flags & NFSMNT_RSIZE) 548 nmp->nm_readdirsize = nmp->nm_rsize; 549 550 if (nmp->nm_readdirsize > maxio) 551 nmp->nm_readdirsize = maxio; 552 553 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 554 argp->maxgrouplist <= NFS_MAXGRPS) 555 nmp->nm_numgrps = argp->maxgrouplist; 556 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 557 argp->readahead <= NFS_MAXRAHEAD) 558 nmp->nm_readahead = argp->readahead; 559 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 560 argp->deadthresh <= NFS_NEVERDEAD) 561 nmp->nm_deadthresh = argp->deadthresh; 562 563 adjsock |= ((nmp->nm_sotype != argp->sotype) || 564 (nmp->nm_soproto != argp->proto)); 565 nmp->nm_sotype = argp->sotype; 566 nmp->nm_soproto = argp->proto; 567 568 if (nmp->nm_so && adjsock) { 569 nfs_safedisconnect(nmp); 570 if (nmp->nm_sotype == SOCK_DGRAM) 571 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 572 printf("nfs_args: retrying connect\n"); 573 kpause("nfscn3", false, hz, NULL); 574 } 575 } 576 } 577 578 /* 579 * VFS Operations. 580 * 581 * mount system call 582 * It seems a bit dumb to copyinstr() the host and path here and then 583 * memcpy() them in mountnfs(), but I wanted to detect errors before 584 * doing the sockargs() call because sockargs() allocates an mbuf and 585 * an error after that means that I have to release the mbuf. 586 */ 587 /* ARGSUSED */ 588 int 589 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 590 { 591 struct lwp *l = curlwp; 592 int error; 593 struct nfs_args *args = data; 594 struct mbuf *nam; 595 struct nfsmount *nmp = VFSTONFS(mp); 596 struct sockaddr *sa; 597 struct vnode *vp; 598 char *pth, *hst; 599 struct proc *p; 600 size_t len; 601 u_char *nfh; 602 603 if (args == NULL) 604 return EINVAL; 605 if (*data_len < sizeof *args) 606 return EINVAL; 607 608 p = l->l_proc; 609 if (mp->mnt_flag & MNT_GETARGS) { 610 611 if (nmp == NULL) 612 return (EIO); 613 if (args->addr != NULL) { 614 sa = mtod(nmp->nm_nam, struct sockaddr *); 615 error = copyout(sa, args->addr, sa->sa_len); 616 if (error) 617 return (error); 618 args->addrlen = sa->sa_len; 619 } else 620 args->addrlen = 0; 621 622 args->version = NFS_ARGSVERSION; 623 args->sotype = nmp->nm_sotype; 624 args->proto = nmp->nm_soproto; 625 args->fh = NULL; 626 args->fhsize = 0; 627 args->flags = nmp->nm_flag; 628 args->wsize = nmp->nm_wsize; 629 args->rsize = nmp->nm_rsize; 630 args->readdirsize = nmp->nm_readdirsize; 631 args->timeo = nmp->nm_timeo; 632 args->retrans = nmp->nm_retry; 633 args->maxgrouplist = nmp->nm_numgrps; 634 args->readahead = nmp->nm_readahead; 635 args->leaseterm = 0; /* dummy */ 636 args->deadthresh = nmp->nm_deadthresh; 637 args->hostname = NULL; 638 *data_len = sizeof *args; 639 return 0; 640 } 641 642 if (args->version != NFS_ARGSVERSION) 643 return (EPROGMISMATCH); 644 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 645 return (EPROGUNAVAIL); 646 #ifdef NFS_V2_ONLY 647 if (args->flags & NFSMNT_NFSV3) 648 return (EPROGMISMATCH); 649 #endif 650 if (mp->mnt_flag & MNT_UPDATE) { 651 if (nmp == NULL) 652 return (EIO); 653 /* 654 * When doing an update, we can't change from or to 655 * v3, or change cookie translation 656 */ 657 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 658 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 659 nfs_decode_args(nmp, args, l); 660 return (0); 661 } 662 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 663 return (EINVAL); 664 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 665 error = copyin(args->fh, nfh, args->fhsize); 666 if (error) 667 goto free_nfh; 668 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 669 error = copyinstr(path, pth, MNAMELEN - 1, &len); 670 if (error) 671 goto free_pth; 672 memset(&pth[len], 0, MNAMELEN - len); 673 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 674 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 675 if (error) 676 goto free_hst; 677 memset(&hst[len], 0, MNAMELEN - len); 678 /* sockargs() call must be after above copyin() calls */ 679 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 680 if (error) 681 goto free_hst; 682 MCLAIM(nam, &nfs_mowner); 683 args->fh = nfh; 684 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 685 686 free_hst: 687 free(hst, M_TEMP); 688 free_pth: 689 free(pth, M_TEMP); 690 free_nfh: 691 free(nfh, M_TEMP); 692 693 return (error); 694 } 695 696 /* 697 * Common code for mount and mountroot 698 */ 699 int 700 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) 701 { 702 struct nfsmount *nmp; 703 struct nfsnode *np; 704 struct vnode *vp; 705 int error; 706 struct vattr *attrs; 707 kauth_cred_t cr; 708 char iosname[IOSTATNAMELEN]; 709 710 /* 711 * If the number of nfs iothreads to use has never 712 * been set, create a reasonable number of them. 713 */ 714 715 if (nfs_niothreads < 0) { 716 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 717 } 718 719 if (mp->mnt_flag & MNT_UPDATE) { 720 nmp = VFSTONFS(mp); 721 /* update paths, file handles, etc, here XXX */ 722 m_freem(nam); 723 return (0); 724 } else { 725 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 726 mp->mnt_data = nmp; 727 TAILQ_INIT(&nmp->nm_uidlruhead); 728 TAILQ_INIT(&nmp->nm_bufq); 729 rw_init(&nmp->nm_writeverflock); 730 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 731 rw_init(&nmp->nm_rbtlock); 732 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 733 cv_init(&nmp->nm_sndcv, "nfssnd"); 734 cv_init(&nmp->nm_aiocv, "nfsaio"); 735 cv_init(&nmp->nm_disconcv, "nfsdis"); 736 nfs_rbtinit(nmp); 737 } 738 vfs_getnewfsid(mp); 739 nmp->nm_mountp = mp; 740 741 #ifndef NFS_V2_ONLY 742 if ((argp->flags & NFSMNT_NFSV3) == 0) 743 #endif 744 { 745 if (argp->fhsize != NFSX_V2FH) { 746 return EINVAL; 747 } 748 } 749 750 /* 751 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 752 * will overwrite this. 753 */ 754 nmp->nm_maxfilesize = 0xffffffffLL; 755 756 nmp->nm_timeo = NFS_TIMEO; 757 nmp->nm_retry = NFS_RETRANS; 758 nmp->nm_wsize = NFS_WSIZE; 759 nmp->nm_rsize = NFS_RSIZE; 760 nmp->nm_readdirsize = NFS_READDIRSIZE; 761 nmp->nm_numgrps = NFS_MAXGRPS; 762 nmp->nm_readahead = NFS_DEFRAHEAD; 763 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 764 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 765 mp->mnt_op->vfs_name, mp, l); 766 if (error) 767 goto bad; 768 nmp->nm_nam = nam; 769 770 /* Set up the sockets and per-host congestion */ 771 nmp->nm_sotype = argp->sotype; 772 nmp->nm_soproto = argp->proto; 773 774 nfs_decode_args(nmp, argp, l); 775 776 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 777 mp->mnt_dev_bshift = DEV_BSHIFT; 778 779 /* 780 * For Connection based sockets (TCP,...) defer the connect until 781 * the first request, in case the server is not responding. 782 */ 783 if (nmp->nm_sotype == SOCK_DGRAM && 784 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 785 goto bad; 786 787 /* 788 * This is silly, but it has to be set so that vinifod() works. 789 * We do not want to do an nfs_statvfs() here since we can get 790 * stuck on a dead server and we are holding a lock on the mount 791 * point. 792 */ 793 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 794 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 795 if (error) 796 goto bad; 797 vp = NFSTOV(np); 798 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 799 VOP_GETATTR(vp, attrs, l->l_cred); 800 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 801 cr = kauth_cred_alloc(); 802 kauth_cred_setuid(cr, attrs->va_uid); 803 kauth_cred_seteuid(cr, attrs->va_uid); 804 kauth_cred_setsvuid(cr, attrs->va_uid); 805 kauth_cred_setgid(cr, attrs->va_gid); 806 kauth_cred_setegid(cr, attrs->va_gid); 807 kauth_cred_setsvgid(cr, attrs->va_gid); 808 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 809 kauth_cred_free(cr); 810 } 811 free(attrs, M_TEMP); 812 813 /* 814 * A reference count is needed on the nfsnode representing the 815 * remote root. If this object is not persistent, then backward 816 * traversals of the mount point (i.e. "..") will not work if 817 * the nfsnode gets flushed out of the cache. Ufs does not have 818 * this problem, because one can identify root inodes by their 819 * number == ROOTINO (2). So, just unlock, but no rele. 820 */ 821 822 nmp->nm_vnode = vp; 823 if (vp->v_type == VNON) 824 vp->v_type = VDIR; 825 vp->v_vflag |= VV_ROOT; 826 VOP_UNLOCK(vp); 827 *vpp = vp; 828 829 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 830 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 831 832 return (0); 833 bad: 834 nfs_disconnect(nmp); 835 rw_destroy(&nmp->nm_writeverflock); 836 rw_destroy(&nmp->nm_rbtlock); 837 mutex_destroy(&nmp->nm_lock); 838 cv_destroy(&nmp->nm_rcvcv); 839 cv_destroy(&nmp->nm_sndcv); 840 cv_destroy(&nmp->nm_aiocv); 841 cv_destroy(&nmp->nm_disconcv); 842 kmem_free(nmp, sizeof(*nmp)); 843 m_freem(nam); 844 return (error); 845 } 846 847 /* 848 * unmount system call 849 */ 850 int 851 nfs_unmount(struct mount *mp, int mntflags) 852 { 853 struct nfsmount *nmp; 854 struct vnode *vp; 855 int error, flags = 0; 856 857 if (mntflags & MNT_FORCE) 858 flags |= FORCECLOSE; 859 nmp = VFSTONFS(mp); 860 /* 861 * Goes something like this.. 862 * - Check for activity on the root vnode (other than ourselves). 863 * - Call vflush() to clear out vnodes for this file system, 864 * except for the root vnode. 865 * - Decrement reference on the vnode representing remote root. 866 * - Close the socket 867 * - Free up the data structures 868 */ 869 /* 870 * We need to decrement the ref. count on the nfsnode representing 871 * the remote root. See comment in mountnfs(). 872 */ 873 vp = nmp->nm_vnode; 874 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 875 if (error != 0) 876 return error; 877 878 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 1) { 879 VOP_UNLOCK(vp); 880 return (EBUSY); 881 } 882 883 error = vflush(mp, vp, flags); 884 if (error) { 885 VOP_UNLOCK(vp); 886 return (error); 887 } 888 889 /* 890 * We are now committed to the unmount; mark the mount structure 891 * as doomed so that any sleepers kicked awake by nfs_disconnect 892 * will go away cleanly. 893 */ 894 nmp->nm_iflag |= NFSMNT_DISMNT; 895 896 /* 897 * Clean up the stats... note that we carefully avoid decrementing 898 * nfs_mount_count here for good reason - we may not be unmounting 899 * the last thing mounted. 900 */ 901 iostat_free(nmp->nm_stats); 902 903 /* 904 * There is one reference count to get rid of here 905 * (see comment in mountnfs()). 906 */ 907 VOP_UNLOCK(vp); 908 vgone(vp); 909 nfs_disconnect(nmp); 910 m_freem(nmp->nm_nam); 911 912 rw_destroy(&nmp->nm_writeverflock); 913 rw_destroy(&nmp->nm_rbtlock); 914 mutex_destroy(&nmp->nm_lock); 915 cv_destroy(&nmp->nm_rcvcv); 916 cv_destroy(&nmp->nm_sndcv); 917 cv_destroy(&nmp->nm_aiocv); 918 cv_destroy(&nmp->nm_disconcv); 919 kmem_free(nmp, sizeof(*nmp)); 920 return (0); 921 } 922 923 /* 924 * Return root of a filesystem 925 */ 926 int 927 nfs_root(struct mount *mp, struct vnode **vpp) 928 { 929 struct vnode *vp; 930 struct nfsmount *nmp; 931 int error; 932 933 nmp = VFSTONFS(mp); 934 vp = nmp->nm_vnode; 935 vref(vp); 936 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 937 if (error != 0) { 938 vrele(vp); 939 return error; 940 } 941 *vpp = vp; 942 return (0); 943 } 944 945 extern int syncprt; 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, *mvp; 955 int error, allerror = 0; 956 957 /* 958 * Force stale buffer cache information to be flushed. 959 */ 960 mvp = vnalloc(mp); 961 loop: 962 /* 963 * NOTE: not using the TAILQ_FOREACH here since in this loop vgone() 964 * and vclean() can be called indirectly 965 */ 966 mutex_enter(&mntvnode_lock); 967 for (vp = TAILQ_FIRST(&mp->mnt_vnodelist); vp; vp = vunmark(mvp)) { 968 vmark(mvp, vp); 969 if (vp->v_mount != mp || vismarker(vp)) 970 continue; 971 mutex_enter(vp->v_interlock); 972 /* XXX MNT_LAZY cannot be right? */ 973 if (waitfor == MNT_LAZY || 974 (LIST_EMPTY(&vp->v_dirtyblkhd) && 975 UVM_OBJ_IS_CLEAN(&vp->v_uobj))) { 976 mutex_exit(vp->v_interlock); 977 continue; 978 } 979 mutex_exit(&mntvnode_lock); 980 error = vget(vp, LK_EXCLUSIVE | LK_NOWAIT); 981 if (error != 0) { 982 if (error != ENOENT) { 983 mutex_enter(&mntvnode_lock); 984 continue; 985 } 986 (void)vunmark(mvp); 987 goto loop; 988 } 989 error = VOP_FSYNC(vp, cred, 990 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 991 if (error) 992 allerror = error; 993 vput(vp); 994 mutex_enter(&mntvnode_lock); 995 } 996 mutex_exit(&mntvnode_lock); 997 vnfree(mvp); 998 return (allerror); 999 } 1000 1001 /* 1002 * NFS flat namespace lookup. 1003 * Currently unsupported. 1004 */ 1005 /* ARGSUSED */ 1006 int 1007 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 1008 { 1009 1010 return (EOPNOTSUPP); 1011 } 1012 1013 /* 1014 * Do that sysctl thang... 1015 */ 1016 static int 1017 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1018 { 1019 struct sysctlnode node; 1020 int val; 1021 int error; 1022 1023 val = nfs_niothreads; 1024 node = *rnode; 1025 node.sysctl_data = &val; 1026 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1027 if (error || newp == NULL) 1028 return error; 1029 1030 return nfs_set_niothreads(val); 1031 } 1032 1033 static void 1034 nfs_sysctl_init(void) 1035 { 1036 1037 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1038 CTLFLAG_PERMANENT, 1039 CTLTYPE_NODE, "vfs", NULL, 1040 NULL, 0, NULL, 0, 1041 CTL_VFS, CTL_EOL); 1042 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1043 CTLFLAG_PERMANENT, 1044 CTLTYPE_NODE, "nfs", 1045 SYSCTL_DESCR("NFS vfs options"), 1046 NULL, 0, NULL, 0, 1047 CTL_VFS, 2, CTL_EOL); 1048 /* 1049 * XXX the "2" above could be dynamic, thereby eliminating one 1050 * more instance of the "number to vfs" mapping problem, but 1051 * "2" is the order as taken from sys/mount.h 1052 */ 1053 1054 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1055 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1056 CTLTYPE_STRUCT, "nfsstats", 1057 SYSCTL_DESCR("NFS operation statistics"), 1058 NULL, 0, &nfsstats, sizeof(nfsstats), 1059 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1060 sysctl_createv(&nfs_clog, 0, NULL, NULL, 1061 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1062 CTLTYPE_INT, "iothreads", 1063 SYSCTL_DESCR("Number of NFS client processes desired"), 1064 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1065 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1066 } 1067 1068 static void 1069 nfs_sysctl_fini(void) 1070 { 1071 1072 sysctl_teardown(&nfs_clog); 1073 } 1074 1075 /* ARGSUSED */ 1076 int 1077 nfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp) 1078 { 1079 size_t fidsize; 1080 size_t fhsize; 1081 struct nfsnode *np; 1082 int error; 1083 struct vattr va; 1084 1085 fidsize = fid->fid_len; 1086 if (fidsize < sizeof(*fid)) { 1087 return EINVAL; 1088 } 1089 fhsize = fidsize - sizeof(*fid); 1090 if ((fhsize % NFSX_UNSIGNED) != 0) { 1091 return EINVAL; 1092 } 1093 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1094 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1095 return EINVAL; 1096 } 1097 } else { 1098 if (fhsize != NFSX_V2FH) { 1099 return EINVAL; 1100 } 1101 } 1102 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1103 if (error) { 1104 return error; 1105 } 1106 *vpp = NFSTOV(np); 1107 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1108 if (error != 0) { 1109 vput(*vpp); 1110 *vpp = NULLVP; 1111 } 1112 return error; 1113 } 1114 1115 /* ARGSUSED */ 1116 int 1117 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1118 { 1119 struct nfsnode *np; 1120 struct fid *fid; 1121 size_t fidsize; 1122 int error = 0; 1123 1124 np = VTONFS(vp); 1125 fidsize = sizeof(*fid) + np->n_fhsize; 1126 if (*bufsize < fidsize) { 1127 error = E2BIG; 1128 } 1129 *bufsize = fidsize; 1130 if (error == 0) { 1131 struct fid fid_store; 1132 1133 fid = &fid_store; 1134 memset(fid, 0, sizeof(*fid)); 1135 fid->fid_len = fidsize; 1136 memcpy(buf, fid, sizeof(*fid)); 1137 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1138 } 1139 return error; 1140 } 1141 1142 /* 1143 * Vfs start routine, a no-op. 1144 */ 1145 /* ARGSUSED */ 1146 int 1147 nfs_start(struct mount *mp, int flags) 1148 { 1149 1150 return (0); 1151 } 1152 1153 /* 1154 * Called once at VFS init to initialize client-specific data structures. 1155 */ 1156 void 1157 nfs_vfs_init(void) 1158 { 1159 1160 /* Initialize NFS server / client shared data. */ 1161 nfs_init(); 1162 nfs_node_init(); 1163 1164 /* Initialize the kqueue structures */ 1165 nfs_kqinit(); 1166 /* Initialize the iod structures */ 1167 nfs_iodinit(); 1168 1169 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); 1170 } 1171 1172 void 1173 nfs_vfs_done(void) 1174 { 1175 1176 nfs_node_done(); 1177 nfs_kqfini(); 1178 nfs_iodfini(); 1179 } 1180
Indexes created Wed Oct 01 07:09:59 GMT 2025