nfs_vfsops.c revision 1.241.2.1
1 /* $NetBSD: nfs_vfsops.c,v 1.241.2.1 2021/04/03 22:29:02 thorpej 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 1.241.2.1 2021/04/03 22:29:02 thorpej 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_loadvnode = nfs_loadvnode, 117 .vfs_vget = nfs_vget, 118 .vfs_fhtovp = nfs_fhtovp, 119 .vfs_vptofh = nfs_vptofh, 120 .vfs_init = nfs_vfs_init, 121 .vfs_done = nfs_vfs_done, 122 .vfs_mountroot = nfs_mountroot, 123 .vfs_snapshot = (void *)eopnotsupp, 124 .vfs_extattrctl = vfs_stdextattrctl, 125 .vfs_suspendctl = genfs_suspendctl, 126 .vfs_renamelock_enter = genfs_renamelock_enter, 127 .vfs_renamelock_exit = genfs_renamelock_exit, 128 .vfs_fsync = (void *)eopnotsupp, 129 .vfs_opv_descs = nfs_vnodeopv_descs 130 }; 131 132 extern u_int32_t nfs_procids[NFS_NPROCS]; 133 extern u_int32_t nfs_prog, nfs_vers; 134 135 static int nfs_mount_diskless(struct nfs_dlmount *, const char *, 136 struct mount **, struct vnode **, struct lwp *); 137 138 static int 139 nfs_modcmd(modcmd_t cmd, void *arg) 140 { 141 int error; 142 143 switch (cmd) { 144 case MODULE_CMD_INIT: 145 error = vfs_attach(&nfs_vfsops); 146 return error; 147 case MODULE_CMD_FINI: 148 error = vfs_detach(&nfs_vfsops); 149 return error; 150 default: 151 return ENOTTY; 152 } 153 } 154 155 /* 156 * nfs statvfs call 157 */ 158 int 159 nfs_statvfs(struct mount *mp, struct statvfs *sbp) 160 { 161 struct lwp *l = curlwp; 162 struct vnode *vp; 163 struct nfs_statfs *sfp; 164 char *cp; 165 u_int32_t *tl; 166 int32_t t1, t2; 167 char *bpos, *dpos, *cp2; 168 struct nfsmount *nmp = VFSTONFS(mp); 169 int error = 0, retattr; 170 #ifdef NFS_V2_ONLY 171 const int v3 = 0; 172 #else 173 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 174 #endif 175 struct mbuf *mreq, *mrep = NULL, *md, *mb; 176 kauth_cred_t cred; 177 u_quad_t tquad; 178 struct nfsnode *np; 179 180 #ifndef nolint 181 sfp = (struct nfs_statfs *)0; 182 #endif 183 vp = nmp->nm_vnode; 184 np = VTONFS(vp); 185 cred = kauth_cred_alloc(); 186 #ifndef NFS_V2_ONLY 187 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 188 (void)nfs_fsinfo(nmp, vp, cred, l); 189 #endif 190 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 191 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 192 nfsm_fhtom(np, v3); 193 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 194 if (v3) 195 nfsm_postop_attr(vp, retattr, 0); 196 if (error) { 197 if (mrep != NULL) { 198 if (mrep->m_next != NULL) 199 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 200 m_freem(mrep); 201 } 202 goto nfsmout; 203 } 204 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 205 sbp->f_flag = nmp->nm_flag; 206 sbp->f_iosize = uimin(nmp->nm_rsize, nmp->nm_wsize); 207 if (v3) { 208 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 209 tquad = fxdr_hyper(&sfp->sf_tbytes); 210 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 211 tquad = fxdr_hyper(&sfp->sf_fbytes); 212 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 213 tquad = fxdr_hyper(&sfp->sf_abytes); 214 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 215 sbp->f_bresvd = sbp->f_bfree - tquad; 216 sbp->f_bavail = tquad; 217 /* Handle older NFS servers returning negative values */ 218 if ((quad_t)sbp->f_bavail < 0) 219 sbp->f_bavail = 0; 220 tquad = fxdr_hyper(&sfp->sf_tfiles); 221 sbp->f_files = tquad; 222 tquad = fxdr_hyper(&sfp->sf_ffiles); 223 sbp->f_ffree = tquad; 224 sbp->f_favail = tquad; 225 sbp->f_fresvd = 0; 226 } else { 227 sbp->f_bsize = NFS_FABLKSIZE; 228 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 229 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 230 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 231 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 232 sbp->f_fresvd = 0; 233 sbp->f_files = 0; 234 sbp->f_ffree = 0; 235 sbp->f_favail = 0; 236 sbp->f_fresvd = 0; 237 } 238 copy_statvfs_info(sbp, mp); 239 nfsm_reqdone; 240 kauth_cred_free(cred); 241 return (error); 242 } 243 244 #ifndef NFS_V2_ONLY 245 /* 246 * nfs version 3 fsinfo rpc call 247 */ 248 int 249 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l) 250 { 251 struct nfsv3_fsinfo *fsp; 252 char *cp; 253 int32_t t1, t2; 254 u_int32_t *tl, pref, xmax; 255 char *bpos, *dpos, *cp2; 256 int error = 0, retattr; 257 struct mbuf *mreq, *mrep, *md, *mb; 258 u_int64_t maxfsize; 259 struct nfsnode *np = VTONFS(vp); 260 261 nfsstats.rpccnt[NFSPROC_FSINFO]++; 262 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 263 nfsm_fhtom(np, 1); 264 nfsm_request(np, NFSPROC_FSINFO, l, cred); 265 nfsm_postop_attr(vp, retattr, 0); 266 if (!error) { 267 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 268 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 269 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 270 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 271 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 272 ~(NFS_FABLKSIZE - 1); 273 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 274 if (xmax < nmp->nm_wsize && xmax > 0) { 275 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 276 if (nmp->nm_wsize == 0) 277 nmp->nm_wsize = xmax; 278 } 279 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 280 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 281 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 282 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 283 ~(NFS_FABLKSIZE - 1); 284 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 285 if (xmax < nmp->nm_rsize && xmax > 0) { 286 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 287 if (nmp->nm_rsize == 0) 288 nmp->nm_rsize = xmax; 289 } 290 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 291 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 292 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 293 ~(NFS_DIRFRAGSIZ - 1); 294 if (xmax < nmp->nm_readdirsize && xmax > 0) { 295 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 296 if (nmp->nm_readdirsize == 0) 297 nmp->nm_readdirsize = xmax; 298 } 299 /* XXX */ 300 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 301 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 302 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 303 nmp->nm_maxfilesize = maxfsize; 304 nmp->nm_mountp->mnt_fs_bshift = 305 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 306 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 307 } 308 nfsm_reqdone; 309 return (error); 310 } 311 #endif 312 313 /* 314 * Mount a remote root fs via. NFS. It goes like this: 315 * - Call nfs_boot_init() to fill in the nfs_diskless struct 316 * - build the rootfs mount point and call mountnfs() to do the rest. 317 */ 318 int 319 nfs_mountroot(void) 320 { 321 struct timespec ts; 322 struct nfs_diskless *nd; 323 struct vattr attr; 324 struct mount *mp; 325 struct vnode *vp; 326 struct lwp *l; 327 long n; 328 int error; 329 330 l = curlwp; /* XXX */ 331 332 if (device_class(root_device) != DV_IFNET) 333 return (ENODEV); 334 335 /* 336 * XXX time must be non-zero when we init the interface or else 337 * the arp code will wedge. [Fixed now in if_ether.c] 338 * However, the NFS attribute cache gives false "hits" when the 339 * current time < nfs_attrtimeo(nmp, np) so keep this in for now. 340 */ 341 if (time_second < NFS_MAXATTRTIMO) { 342 ts.tv_sec = NFS_MAXATTRTIMO; 343 ts.tv_nsec = 0; 344 tc_setclock(&ts); 345 } 346 347 /* 348 * Call nfs_boot_init() to fill in the nfs_diskless struct. 349 * Side effect: Finds and configures a network interface. 350 */ 351 nd = kmem_zalloc(sizeof(*nd), KM_SLEEP); 352 error = nfs_boot_init(nd, l); 353 if (error) { 354 kmem_free(nd, sizeof(*nd)); 355 return (error); 356 } 357 358 /* 359 * Create the root mount point. 360 */ 361 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 362 if (error) 363 goto out; 364 printf("root on %s\n", nd->nd_root.ndm_host); 365 366 /* 367 * Link it into the mount list. 368 */ 369 mountlist_append(mp); 370 rootvp = vp; 371 mp->mnt_vnodecovered = NULLVP; 372 vfs_unbusy(mp); 373 374 /* Get root attributes (for the time). */ 375 vn_lock(vp, LK_SHARED | LK_RETRY); 376 error = VOP_GETATTR(vp, &attr, l->l_cred); 377 VOP_UNLOCK(vp); 378 if (error) 379 panic("nfs_mountroot: getattr for root"); 380 n = attr.va_atime.tv_sec; 381 #ifdef DEBUG 382 printf("root time: 0x%lx\n", n); 383 #endif 384 setrootfstime(n); 385 386 out: 387 if (error) 388 nfs_boot_cleanup(nd, l); 389 kmem_free(nd, sizeof(*nd)); 390 return (error); 391 } 392 393 /* 394 * Internal version of mount system call for diskless setup. 395 * Separate function because we used to call it twice. 396 * (once for root and once for swap) 397 */ 398 static int 399 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l) 400 /* mntname: mount point name */ 401 { 402 struct mount *mp; 403 struct mbuf *m; 404 int error; 405 406 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 407 408 mp->mnt_op = &nfs_vfsops; 409 410 /* 411 * Historical practice expects NFS root file systems to 412 * be initially mounted r/w. 413 */ 414 mp->mnt_flag &= ~MNT_RDONLY; 415 416 /* Get mbuf for server sockaddr. */ 417 m = m_get(M_WAIT, MT_SONAME); 418 if (m == NULL) 419 panic("nfs_mountroot: mget soname for %s", mntname); 420 MCLAIM(m, &nfs_mowner); 421 memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr, 422 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 423 424 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 425 ndmntp->ndm_args.hostname, vpp, l); 426 if (error) { 427 vfs_unbusy(mp); 428 vfs_rele(mp); 429 printf("nfs_mountroot: mount %s failed: %d\n", 430 mntname, error); 431 } else 432 *mpp = mp; 433 434 return (error); 435 } 436 437 void 438 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l) 439 { 440 int s; 441 int adjsock; 442 int maxio; 443 444 s = splsoftnet(); 445 446 /* 447 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 448 * no sense in that context. 449 */ 450 if (argp->sotype == SOCK_STREAM) 451 argp->flags &= ~NFSMNT_NOCONN; 452 453 /* 454 * Cookie translation is not needed for v2, silently ignore it. 455 */ 456 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 457 NFSMNT_XLATECOOKIE) 458 argp->flags &= ~NFSMNT_XLATECOOKIE; 459 460 /* Re-bind if rsrvd port requested and wasn't on one */ 461 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 462 && (argp->flags & NFSMNT_RESVPORT); 463 /* Also re-bind if we're switching to/from a connected UDP socket */ 464 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 465 (argp->flags & NFSMNT_NOCONN)); 466 467 /* Update flags. */ 468 nmp->nm_flag = argp->flags; 469 splx(s); 470 471 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 472 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 473 if (nmp->nm_timeo < NFS_MINTIMEO) 474 nmp->nm_timeo = NFS_MINTIMEO; 475 else if (nmp->nm_timeo > NFS_MAXTIMEO) 476 nmp->nm_timeo = NFS_MAXTIMEO; 477 } 478 479 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 480 nmp->nm_retry = argp->retrans; 481 if (nmp->nm_retry > NFS_MAXREXMIT) 482 nmp->nm_retry = NFS_MAXREXMIT; 483 } 484 485 #ifndef NFS_V2_ONLY 486 if (argp->flags & NFSMNT_NFSV3) { 487 if (argp->sotype == SOCK_DGRAM) 488 maxio = NFS_MAXDGRAMDATA; 489 else 490 maxio = NFS_MAXDATA; 491 } else 492 #endif 493 maxio = NFS_V2MAXDATA; 494 495 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 496 int osize = nmp->nm_wsize; 497 nmp->nm_wsize = argp->wsize; 498 /* Round down to multiple of blocksize */ 499 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 500 if (nmp->nm_wsize <= 0) 501 nmp->nm_wsize = NFS_FABLKSIZE; 502 adjsock |= (nmp->nm_wsize != osize); 503 } 504 if (nmp->nm_wsize > maxio) 505 nmp->nm_wsize = maxio; 506 if (nmp->nm_wsize > MAXBSIZE) 507 nmp->nm_wsize = MAXBSIZE; 508 509 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 510 int osize = nmp->nm_rsize; 511 nmp->nm_rsize = argp->rsize; 512 /* Round down to multiple of blocksize */ 513 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 514 if (nmp->nm_rsize <= 0) 515 nmp->nm_rsize = NFS_FABLKSIZE; 516 adjsock |= (nmp->nm_rsize != osize); 517 } 518 if (nmp->nm_rsize > maxio) 519 nmp->nm_rsize = maxio; 520 if (nmp->nm_rsize > MAXBSIZE) 521 nmp->nm_rsize = MAXBSIZE; 522 523 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 524 nmp->nm_readdirsize = argp->readdirsize; 525 /* Round down to multiple of minimum blocksize */ 526 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 527 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 528 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 529 /* Bigger than buffer size makes no sense */ 530 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 531 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 532 } else if (argp->flags & NFSMNT_RSIZE) 533 nmp->nm_readdirsize = nmp->nm_rsize; 534 535 if (nmp->nm_readdirsize > maxio) 536 nmp->nm_readdirsize = maxio; 537 538 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 539 argp->maxgrouplist <= NFS_MAXGRPS) 540 nmp->nm_numgrps = argp->maxgrouplist; 541 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 542 argp->readahead <= NFS_MAXRAHEAD) 543 nmp->nm_readahead = argp->readahead; 544 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 545 argp->deadthresh <= NFS_NEVERDEAD) 546 nmp->nm_deadthresh = argp->deadthresh; 547 548 adjsock |= ((nmp->nm_sotype != argp->sotype) || 549 (nmp->nm_soproto != argp->proto)); 550 nmp->nm_sotype = argp->sotype; 551 nmp->nm_soproto = argp->proto; 552 553 if (nmp->nm_so && adjsock) { 554 nfs_safedisconnect(nmp); 555 if (nmp->nm_sotype == SOCK_DGRAM) 556 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 557 printf("nfs_args: retrying connect\n"); 558 kpause("nfscn3", false, hz, NULL); 559 } 560 } 561 } 562 563 /* 564 * VFS Operations. 565 * 566 * mount system call 567 * It seems a bit dumb to copyinstr() the host and path here and then 568 * memcpy() them in mountnfs(), but I wanted to detect errors before 569 * doing the sockargs() call because sockargs() allocates an mbuf and 570 * an error after that means that I have to release the mbuf. 571 */ 572 /* ARGSUSED */ 573 int 574 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len) 575 { 576 struct lwp *l = curlwp; 577 int error; 578 struct nfs_args *args = data; 579 struct mbuf *nam; 580 struct nfsmount *nmp = VFSTONFS(mp); 581 struct sockaddr *sa; 582 struct vnode *vp; 583 char *pth, *hst; 584 size_t len; 585 u_char *nfh; 586 587 if (args == NULL) 588 return EINVAL; 589 if (*data_len < sizeof *args) 590 return EINVAL; 591 592 if (mp->mnt_flag & MNT_GETARGS) { 593 594 if (nmp == NULL) 595 return (EIO); 596 if (args->addr != NULL) { 597 sa = mtod(nmp->nm_nam, struct sockaddr *); 598 error = copyout(sa, args->addr, sa->sa_len); 599 if (error) 600 return (error); 601 args->addrlen = sa->sa_len; 602 } else 603 args->addrlen = 0; 604 605 args->version = NFS_ARGSVERSION; 606 args->sotype = nmp->nm_sotype; 607 args->proto = nmp->nm_soproto; 608 args->fh = NULL; 609 args->fhsize = 0; 610 args->flags = nmp->nm_flag; 611 args->wsize = nmp->nm_wsize; 612 args->rsize = nmp->nm_rsize; 613 args->readdirsize = nmp->nm_readdirsize; 614 args->timeo = nmp->nm_timeo; 615 args->retrans = nmp->nm_retry; 616 args->maxgrouplist = nmp->nm_numgrps; 617 args->readahead = nmp->nm_readahead; 618 args->leaseterm = 0; /* dummy */ 619 args->deadthresh = nmp->nm_deadthresh; 620 args->hostname = NULL; 621 *data_len = sizeof *args; 622 return 0; 623 } 624 625 if (args->version != NFS_ARGSVERSION) 626 return (EPROGMISMATCH); 627 if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB)) 628 return (EPROGUNAVAIL); 629 #ifdef NFS_V2_ONLY 630 if (args->flags & NFSMNT_NFSV3) 631 return (EPROGMISMATCH); 632 #endif 633 if (mp->mnt_flag & MNT_UPDATE) { 634 if (nmp == NULL) 635 return (EIO); 636 /* 637 * When doing an update, we can't change from or to 638 * v3, or change cookie translation 639 */ 640 args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) | 641 (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)); 642 nfs_decode_args(nmp, args, l); 643 return (0); 644 } 645 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 646 return (EINVAL); 647 nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK); 648 error = copyin(args->fh, nfh, args->fhsize); 649 if (error) 650 goto free_nfh; 651 pth = malloc(MNAMELEN, M_TEMP, M_WAITOK); 652 error = copyinstr(path, pth, MNAMELEN - 1, &len); 653 if (error) 654 goto free_pth; 655 memset(&pth[len], 0, MNAMELEN - len); 656 hst = malloc(MNAMELEN, M_TEMP, M_WAITOK); 657 error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len); 658 if (error) 659 goto free_hst; 660 memset(&hst[len], 0, MNAMELEN - len); 661 /* sockargs() call must be after above copyin() calls */ 662 error = sockargs(&nam, args->addr, args->addrlen, UIO_USERSPACE, 663 MT_SONAME); 664 if (error) 665 goto free_hst; 666 MCLAIM(nam, &nfs_mowner); 667 args->fh = nfh; 668 error = mountnfs(args, mp, nam, pth, hst, &vp, l); 669 670 free_hst: 671 free(hst, M_TEMP); 672 free_pth: 673 free(pth, M_TEMP); 674 free_nfh: 675 free(nfh, M_TEMP); 676 677 return (error); 678 } 679 680 /* 681 * Common code for mount and mountroot 682 */ 683 int 684 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l) 685 { 686 struct nfsmount *nmp; 687 struct nfsnode *np; 688 struct vnode *vp; 689 int error; 690 struct vattr *attrs; 691 kauth_cred_t cr; 692 char iosname[IOSTATNAMELEN]; 693 694 /* 695 * If the number of nfs iothreads to use has never 696 * been set, create a reasonable number of them. 697 */ 698 699 if (nfs_niothreads < 0) { 700 nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS); 701 } 702 703 if (mp->mnt_flag & MNT_UPDATE) { 704 nmp = VFSTONFS(mp); 705 /* update paths, file handles, etc, here XXX */ 706 m_freem(nam); 707 return 0; 708 } 709 nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP); 710 TAILQ_INIT(&nmp->nm_uidlruhead); 711 TAILQ_INIT(&nmp->nm_bufq); 712 rw_init(&nmp->nm_writeverflock); 713 mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE); 714 cv_init(&nmp->nm_rcvcv, "nfsrcv"); 715 cv_init(&nmp->nm_sndcv, "nfssnd"); 716 cv_init(&nmp->nm_aiocv, "nfsaio"); 717 cv_init(&nmp->nm_disconcv, "nfsdis"); 718 719 mp->mnt_data = nmp; 720 mp->mnt_stat.f_namemax = NFS_MAXNAMLEN; 721 vfs_getnewfsid(mp); 722 nmp->nm_mountp = mp; 723 724 #ifndef NFS_V2_ONLY 725 if ((argp->flags & NFSMNT_NFSV3) == 0) 726 #endif 727 { 728 if (argp->fhsize != NFSX_V2FH) { 729 return EINVAL; 730 } 731 } 732 733 /* 734 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 735 * will overwrite this. 736 */ 737 nmp->nm_maxfilesize = 0xffffffffLL; 738 739 nmp->nm_timeo = NFS_TIMEO; 740 nmp->nm_retry = NFS_RETRANS; 741 nmp->nm_wsize = NFS_WSIZE; 742 nmp->nm_rsize = NFS_RSIZE; 743 nmp->nm_readdirsize = NFS_READDIRSIZE; 744 nmp->nm_numgrps = NFS_MAXGRPS; 745 nmp->nm_readahead = NFS_DEFRAHEAD; 746 nmp->nm_deadthresh = NFS_DEFDEADTHRESH; 747 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, 748 mp->mnt_op->vfs_name, mp, l); 749 if (error) 750 goto bad; 751 nmp->nm_nam = nam; 752 753 /* Set up the sockets and per-host congestion */ 754 nmp->nm_sotype = argp->sotype; 755 nmp->nm_soproto = argp->proto; 756 757 nfs_decode_args(nmp, argp, l); 758 759 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 760 mp->mnt_dev_bshift = DEV_BSHIFT; 761 762 /* 763 * For Connection based sockets (TCP,...) defer the connect until 764 * the first request, in case the server is not responding. 765 */ 766 if (nmp->nm_sotype == SOCK_DGRAM && 767 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 768 goto bad; 769 770 /* 771 * This is silly, but it has to be set so that vinifod() works. 772 * We do not want to do an nfs_statvfs() here since we can get 773 * stuck on a dead server and we are holding a lock on the mount 774 * point. 775 */ 776 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 777 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 778 if (error) 779 goto bad; 780 vp = NFSTOV(np); 781 attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK); 782 VOP_GETATTR(vp, attrs, l->l_cred); 783 if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) { 784 cr = kauth_cred_alloc(); 785 kauth_cred_setuid(cr, attrs->va_uid); 786 kauth_cred_seteuid(cr, attrs->va_uid); 787 kauth_cred_setsvuid(cr, attrs->va_uid); 788 kauth_cred_setgid(cr, attrs->va_gid); 789 kauth_cred_setegid(cr, attrs->va_gid); 790 kauth_cred_setsvgid(cr, attrs->va_gid); 791 nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr); 792 kauth_cred_free(cr); 793 } 794 free(attrs, M_TEMP); 795 796 /* 797 * A reference count is needed on the nfsnode representing the 798 * remote root. If this object is not persistent, then backward 799 * traversals of the mount point (i.e. "..") will not work if 800 * the nfsnode gets flushed out of the cache. Ufs does not have 801 * this problem, because one can identify root inodes by their 802 * number == UFS_ROOTINO (2). So, just unlock, but no rele. 803 */ 804 805 nmp->nm_vnode = vp; 806 if (vp->v_type == VNON) 807 vp->v_type = VDIR; 808 vp->v_vflag |= VV_ROOT; 809 VOP_UNLOCK(vp); 810 *vpp = vp; 811 812 snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++); 813 nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname); 814 815 return (0); 816 bad: 817 nfs_disconnect(nmp); 818 rw_destroy(&nmp->nm_writeverflock); 819 mutex_destroy(&nmp->nm_lock); 820 cv_destroy(&nmp->nm_rcvcv); 821 cv_destroy(&nmp->nm_sndcv); 822 cv_destroy(&nmp->nm_aiocv); 823 cv_destroy(&nmp->nm_disconcv); 824 kmem_free(nmp, sizeof(*nmp)); 825 m_freem(nam); 826 return (error); 827 } 828 829 /* 830 * unmount system call 831 */ 832 int 833 nfs_unmount(struct mount *mp, int mntflags) 834 { 835 struct nfsmount *nmp = VFSTONFS(mp); 836 struct vnode *vp; 837 int error, flags = 0; 838 839 if (mntflags & MNT_FORCE) { 840 mutex_enter(&nmp->nm_lock); 841 flags |= FORCECLOSE; 842 nmp->nm_iflag |= NFSMNT_DISMNTFORCE; 843 mutex_exit(&nmp->nm_lock); 844 845 } 846 847 /* 848 * Goes something like this.. 849 * - Check for activity on the root vnode (other than ourselves). 850 * - Call vflush() to clear out vnodes for this file system, 851 * except for the root vnode. 852 * - Decrement reference on the vnode representing remote root. 853 * - Close the socket 854 * - Free up the data structures 855 */ 856 /* 857 * We need to decrement the ref. count on the nfsnode representing 858 * the remote root. See comment in mountnfs(). 859 */ 860 vp = nmp->nm_vnode; 861 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 862 if (error != 0) 863 goto err; 864 865 if ((mntflags & MNT_FORCE) == 0 && vrefcnt(vp) > 1) { 866 VOP_UNLOCK(vp); 867 error = EBUSY; 868 goto err; 869 } 870 871 error = vflush(mp, vp, flags); 872 if (error) { 873 VOP_UNLOCK(vp); 874 goto err; 875 } 876 877 /* 878 * We are now committed to the unmount; mark the mount structure 879 * as doomed so that any sleepers kicked awake by nfs_disconnect 880 * will go away cleanly. 881 */ 882 nmp->nm_iflag |= NFSMNT_DISMNT; 883 884 /* 885 * No new async I/O will be added, but await for pending 886 * ones to drain. 887 */ 888 while (nfs_iodbusy(nmp)) 889 kpause("nfsumnt", false, hz, NULL); 890 891 /* 892 * Clean up the stats... note that we carefully avoid decrementing 893 * nfs_mount_count here for good reason - we may not be unmounting 894 * the last thing mounted. 895 */ 896 iostat_free(nmp->nm_stats); 897 898 /* 899 * There is one reference count to get rid of here 900 * (see comment in mountnfs()). 901 */ 902 VOP_UNLOCK(vp); 903 vgone(vp); 904 nfs_disconnect(nmp); 905 m_freem(nmp->nm_nam); 906 907 rw_destroy(&nmp->nm_writeverflock); 908 mutex_destroy(&nmp->nm_lock); 909 cv_destroy(&nmp->nm_rcvcv); 910 cv_destroy(&nmp->nm_sndcv); 911 cv_destroy(&nmp->nm_aiocv); 912 cv_destroy(&nmp->nm_disconcv); 913 kmem_free(nmp, sizeof(*nmp)); 914 return (0); 915 916 err: 917 if (mntflags & MNT_FORCE) { 918 mutex_enter(&nmp->nm_lock); 919 nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE; 920 mutex_exit(&nmp->nm_lock); 921 } 922 923 return error; 924 } 925 926 /* 927 * Return root of a filesystem 928 */ 929 int 930 nfs_root(struct mount *mp, int lktype, struct vnode **vpp) 931 { 932 struct vnode *vp; 933 struct nfsmount *nmp; 934 int error; 935 936 nmp = VFSTONFS(mp); 937 vp = nmp->nm_vnode; 938 vref(vp); 939 error = vn_lock(vp, lktype | LK_RETRY); 940 if (error != 0) { 941 vrele(vp); 942 return error; 943 } 944 *vpp = vp; 945 return (0); 946 } 947 948 extern int syncprt; 949 950 static bool 951 nfs_sync_selector(void *cl, struct vnode *vp) 952 { 953 954 KASSERT(mutex_owned(vp->v_interlock)); 955 956 return !LIST_EMPTY(&vp->v_dirtyblkhd) || 957 (vp->v_iflag & VI_ONWORKLST) != 0; 958 } 959 960 /* 961 * Flush out the buffer cache 962 */ 963 /* ARGSUSED */ 964 int 965 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) 966 { 967 struct vnode *vp; 968 struct vnode_iterator *marker; 969 int error, allerror = 0; 970 971 /* 972 * Force stale buffer cache information to be flushed. 973 */ 974 vfs_vnode_iterator_init(mp, &marker); 975 while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector, 976 NULL))) 977 { 978 error = vn_lock(vp, LK_EXCLUSIVE); 979 if (error) { 980 vrele(vp); 981 continue; 982 } 983 error = VOP_FSYNC(vp, cred, 984 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0); 985 if (error) 986 allerror = error; 987 vput(vp); 988 } 989 vfs_vnode_iterator_destroy(marker); 990 return allerror; 991 } 992 993 /* 994 * NFS flat namespace lookup. 995 * Currently unsupported. 996 */ 997 /* ARGSUSED */ 998 int 999 nfs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp) 1000 { 1001 1002 return (EOPNOTSUPP); 1003 } 1004 1005 /* 1006 * Do that sysctl thang... 1007 */ 1008 static int 1009 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1010 { 1011 struct sysctlnode node; 1012 int val; 1013 int error; 1014 1015 val = nfs_niothreads; 1016 node = *rnode; 1017 node.sysctl_data = &val; 1018 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1019 if (error || newp == NULL) 1020 return error; 1021 1022 return nfs_set_niothreads(val); 1023 } 1024 1025 SYSCTL_SETUP(nfs_sysctl_init, "nfs sysctl") 1026 { 1027 1028 sysctl_createv(clog, 0, NULL, NULL, 1029 CTLFLAG_PERMANENT, 1030 CTLTYPE_NODE, "nfs", 1031 SYSCTL_DESCR("NFS vfs options"), 1032 NULL, 0, NULL, 0, 1033 CTL_VFS, 2, CTL_EOL); 1034 /* 1035 * XXX the "2" above could be dynamic, thereby eliminating one 1036 * more instance of the "number to vfs" mapping problem, but 1037 * "2" is the order as taken from sys/mount.h 1038 */ 1039 1040 sysctl_createv(clog, 0, NULL, NULL, 1041 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1042 CTLTYPE_STRUCT, "nfsstats", 1043 SYSCTL_DESCR("NFS operation statistics"), 1044 NULL, 0, &nfsstats, sizeof(nfsstats), 1045 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1046 sysctl_createv(clog, 0, NULL, NULL, 1047 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1048 CTLTYPE_INT, "iothreads", 1049 SYSCTL_DESCR("Number of NFS client processes desired"), 1050 sysctl_vfs_nfs_iothreads, 0, NULL, 0, 1051 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1052 } 1053 1054 /* ARGSUSED */ 1055 int 1056 nfs_fhtovp(struct mount *mp, struct fid *fid, int lktype, struct vnode **vpp) 1057 { 1058 size_t fidsize; 1059 size_t fhsize; 1060 struct nfsnode *np; 1061 int error; 1062 struct vattr va; 1063 1064 fidsize = fid->fid_len; 1065 if (fidsize < sizeof(*fid)) { 1066 return EINVAL; 1067 } 1068 fhsize = fidsize - sizeof(*fid); 1069 if ((fhsize % NFSX_UNSIGNED) != 0) { 1070 return EINVAL; 1071 } 1072 if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) { 1073 if (fhsize > NFSX_V3FHMAX || fhsize == 0) { 1074 return EINVAL; 1075 } 1076 } else { 1077 if (fhsize != NFSX_V2FH) { 1078 return EINVAL; 1079 } 1080 } 1081 /* XXX lktype ignored */ 1082 error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np); 1083 if (error) { 1084 return error; 1085 } 1086 *vpp = NFSTOV(np); 1087 error = VOP_GETATTR(*vpp, &va, kauth_cred_get()); 1088 if (error != 0) { 1089 vput(*vpp); 1090 *vpp = NULLVP; 1091 } 1092 return error; 1093 } 1094 1095 /* ARGSUSED */ 1096 int 1097 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize) 1098 { 1099 struct nfsnode *np; 1100 struct fid *fid; 1101 size_t fidsize; 1102 int error = 0; 1103 1104 np = VTONFS(vp); 1105 fidsize = sizeof(*fid) + np->n_fhsize; 1106 if (*bufsize < fidsize) { 1107 error = E2BIG; 1108 } 1109 *bufsize = fidsize; 1110 if (error == 0) { 1111 struct fid fid_store; 1112 1113 fid = &fid_store; 1114 memset(fid, 0, sizeof(*fid)); 1115 fid->fid_len = fidsize; 1116 memcpy(buf, fid, sizeof(*fid)); 1117 memcpy(buf->fid_data, np->n_fhp, np->n_fhsize); 1118 } 1119 return error; 1120 } 1121 1122 /* 1123 * Vfs start routine, a no-op. 1124 */ 1125 /* ARGSUSED */ 1126 int 1127 nfs_start(struct mount *mp, int flags) 1128 { 1129 1130 return (0); 1131 } 1132 1133 /* 1134 * Called once at VFS init to initialize client-specific data structures. 1135 */ 1136 void 1137 nfs_vfs_init(void) 1138 { 1139 1140 /* Initialize NFS server / client shared data. */ 1141 nfs_init(); 1142 nfs_node_init(); 1143 1144 /* Initialize the kqueue structures */ 1145 nfs_kqinit(); 1146 /* Initialize the iod structures */ 1147 nfs_iodinit(); 1148 1149 nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4); 1150 } 1151 1152 void 1153 nfs_vfs_done(void) 1154 { 1155 1156 nfs_node_done(); 1157 nfs_kqfini(); 1158 nfs_iodfini(); 1159 nfs_fini(); 1160 } 1161
Indexes created Wed Oct 01 07:09:59 GMT 2025