nfs_vfsops.c revision 1.151.6.2
1 /* $NetBSD: nfs_vfsops.c,v 1.151.6.2 2006/04/22 11:40:16 simonb 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 1.151.6.2 2006/04/22 11:40:16 simonb Exp $"); 39 40 #if defined(_KERNEL_OPT) 41 #include "opt_compat_netbsd.h" 42 #include "opt_nfs.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/ioctl.h> 47 #include <sys/signal.h> 48 #include <sys/proc.h> 49 #include <sys/namei.h> 50 #include <sys/device.h> 51 #include <sys/vnode.h> 52 #include <sys/kernel.h> 53 #include <sys/mount.h> 54 #include <sys/buf.h> 55 #include <sys/mbuf.h> 56 #include <sys/dirent.h> 57 #include <sys/socket.h> 58 #include <sys/socketvar.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/timetc.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 #include <netinet/in.h> 66 67 #include <nfs/rpcv2.h> 68 #include <nfs/nfsproto.h> 69 #include <nfs/nfsnode.h> 70 #include <nfs/nfs.h> 71 #include <nfs/nfsmount.h> 72 #include <nfs/xdr_subs.h> 73 #include <nfs/nfsm_subs.h> 74 #include <nfs/nfsdiskless.h> 75 #include <nfs/nqnfs.h> 76 #include <nfs/nfs_var.h> 77 78 extern struct nfsstats nfsstats; 79 extern int nfs_ticks; 80 81 /* 82 * keep a count of the nfs mounts to generate ficticious drive names 83 * for the per drive stats. 84 */ 85 unsigned int nfs_mount_count = 0; 86 87 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 88 89 /* 90 * nfs vfs operations. 91 */ 92 93 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 94 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 95 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 96 97 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 98 &nfsv2_vnodeop_opv_desc, 99 &spec_nfsv2nodeop_opv_desc, 100 &fifo_nfsv2nodeop_opv_desc, 101 NULL, 102 }; 103 104 struct vfsops nfs_vfsops = { 105 MOUNT_NFS, 106 nfs_mount, 107 nfs_start, 108 nfs_unmount, 109 nfs_root, 110 nfs_quotactl, 111 nfs_statvfs, 112 nfs_sync, 113 nfs_vget, 114 nfs_fhtovp, 115 nfs_vptofh, 116 nfs_vfs_init, 117 nfs_vfs_reinit, 118 nfs_vfs_done, 119 nfs_mountroot, 120 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 121 vfs_stdextattrctl, 122 nfs_vnodeopv_descs, 123 }; 124 VFS_ATTACH(nfs_vfsops); 125 126 extern u_int32_t nfs_procids[NFS_NPROCS]; 127 extern u_int32_t nfs_prog, nfs_vers; 128 129 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 130 struct mount **, struct vnode **, struct lwp *)); 131 132 /* 133 * nfs statvfs call 134 */ 135 int 136 nfs_statvfs(mp, sbp, l) 137 struct mount *mp; 138 struct statvfs *sbp; 139 struct lwp *l; 140 { 141 struct vnode *vp; 142 struct nfs_statfs *sfp; 143 caddr_t cp; 144 u_int32_t *tl; 145 int32_t t1, t2; 146 caddr_t bpos, dpos, cp2; 147 struct nfsmount *nmp = VFSTONFS(mp); 148 int error = 0, retattr; 149 #ifdef NFS_V2_ONLY 150 const int v3 = 0; 151 #else 152 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 153 #endif 154 struct mbuf *mreq, *mrep = NULL, *md, *mb; 155 struct ucred *cred; 156 u_quad_t tquad; 157 struct nfsnode *np; 158 159 #ifndef nolint 160 sfp = (struct nfs_statfs *)0; 161 #endif 162 vp = nmp->nm_vnode; 163 np = VTONFS(vp); 164 cred = crget(); 165 cred->cr_ngroups = 0; 166 #ifndef NFS_V2_ONLY 167 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 168 (void)nfs_fsinfo(nmp, vp, cred, l); 169 #endif 170 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 171 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 172 nfsm_fhtom(np, v3); 173 nfsm_request(np, NFSPROC_FSSTAT, l, cred); 174 if (v3) 175 nfsm_postop_attr(vp, retattr, 0); 176 if (error) { 177 if (mrep != NULL) { 178 if (mrep->m_next != NULL) 179 printf("nfs_vfsops: nfs_statvfs would lose buffers\n"); 180 m_freem(mrep); 181 } 182 goto nfsmout; 183 } 184 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 185 sbp->f_flag = nmp->nm_flag; 186 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 187 if (v3) { 188 sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE; 189 tquad = fxdr_hyper(&sfp->sf_tbytes); 190 sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 191 tquad = fxdr_hyper(&sfp->sf_fbytes); 192 sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 193 tquad = fxdr_hyper(&sfp->sf_abytes); 194 tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 195 sbp->f_bresvd = sbp->f_bfree - tquad; 196 sbp->f_bavail = tquad; 197 #ifdef COMPAT_20 198 /* Handle older NFS servers returning negative values */ 199 if ((quad_t)sbp->f_bavail < 0) 200 sbp->f_bavail = 0; 201 #endif 202 tquad = fxdr_hyper(&sfp->sf_tfiles); 203 sbp->f_files = tquad; 204 tquad = fxdr_hyper(&sfp->sf_ffiles); 205 sbp->f_ffree = tquad; 206 sbp->f_favail = tquad; 207 sbp->f_fresvd = 0; 208 sbp->f_namemax = MAXNAMLEN; 209 } else { 210 sbp->f_bsize = NFS_FABLKSIZE; 211 sbp->f_frsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 212 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 213 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 214 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 215 sbp->f_fresvd = 0; 216 sbp->f_files = 0; 217 sbp->f_ffree = 0; 218 sbp->f_favail = 0; 219 sbp->f_fresvd = 0; 220 sbp->f_namemax = MAXNAMLEN; 221 } 222 copy_statvfs_info(sbp, mp); 223 nfsm_reqdone; 224 crfree(cred); 225 return (error); 226 } 227 228 #ifndef NFS_V2_ONLY 229 /* 230 * nfs version 3 fsinfo rpc call 231 */ 232 int 233 nfs_fsinfo(nmp, vp, cred, l) 234 struct nfsmount *nmp; 235 struct vnode *vp; 236 struct ucred *cred; 237 struct lwp *l; 238 { 239 struct nfsv3_fsinfo *fsp; 240 caddr_t cp; 241 int32_t t1, t2; 242 u_int32_t *tl, pref, xmax; 243 caddr_t bpos, dpos, cp2; 244 int error = 0, retattr; 245 struct mbuf *mreq, *mrep, *md, *mb; 246 u_int64_t maxfsize; 247 struct nfsnode *np = VTONFS(vp); 248 249 nfsstats.rpccnt[NFSPROC_FSINFO]++; 250 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 251 nfsm_fhtom(np, 1); 252 nfsm_request(np, NFSPROC_FSINFO, l, cred); 253 nfsm_postop_attr(vp, retattr, 0); 254 if (!error) { 255 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 256 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 257 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 258 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 259 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 260 ~(NFS_FABLKSIZE - 1); 261 xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 262 if (xmax < nmp->nm_wsize && xmax > 0) { 263 nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1); 264 if (nmp->nm_wsize == 0) 265 nmp->nm_wsize = xmax; 266 } 267 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 268 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 269 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 270 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 271 ~(NFS_FABLKSIZE - 1); 272 xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 273 if (xmax < nmp->nm_rsize && xmax > 0) { 274 nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1); 275 if (nmp->nm_rsize == 0) 276 nmp->nm_rsize = xmax; 277 } 278 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 279 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 280 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 281 ~(NFS_DIRFRAGSIZ - 1); 282 if (xmax < nmp->nm_readdirsize && xmax > 0) { 283 nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1); 284 if (nmp->nm_readdirsize == 0) 285 nmp->nm_readdirsize = xmax; 286 } 287 /* XXX */ 288 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 289 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 290 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 291 nmp->nm_maxfilesize = maxfsize; 292 nmp->nm_mountp->mnt_fs_bshift = 293 ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 294 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 295 } 296 nfsm_reqdone; 297 return (error); 298 } 299 #endif 300 301 /* 302 * Mount a remote root fs via. NFS. It goes like this: 303 * - Call nfs_boot_init() to fill in the nfs_diskless struct 304 * - build the rootfs mount point and call mountnfs() to do the rest. 305 */ 306 int 307 nfs_mountroot() 308 { 309 #ifdef __HAVE_TIMECOUNTER 310 struct timespec ts; 311 #endif 312 struct nfs_diskless *nd; 313 struct vattr attr; 314 struct mount *mp; 315 struct vnode *vp; 316 struct lwp *l; 317 long n; 318 int error; 319 320 l = curlwp; /* XXX */ 321 322 if (device_class(root_device) != DV_IFNET) 323 return (ENODEV); 324 325 /* 326 * XXX time must be non-zero when we init the interface or else 327 * the arp code will wedge. [Fixed now in if_ether.c] 328 * However, the NFS attribute cache gives false "hits" when the 329 * current time < NFS_ATTRTIMEO(nmp, np) so keep this in for now. 330 */ 331 if (time_second < NFS_MAXATTRTIMO) { 332 #ifdef __HAVE_TIMECOUNTER 333 ts.tv_sec = NFS_MAXATTRTIMO; 334 ts.tv_nsec = 0; 335 tc_setclock(&ts); 336 #else /* !__HAVE_TIMECOUNTER */ 337 time.tv_sec = NFS_MAXATTRTIMO; 338 #endif /* !__HAVE_TIMECOUNTER */ 339 } 340 341 /* 342 * Call nfs_boot_init() to fill in the nfs_diskless struct. 343 * Side effect: Finds and configures a network interface. 344 */ 345 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 346 memset((caddr_t)nd, 0, sizeof(*nd)); 347 error = nfs_boot_init(nd, l); 348 if (error) { 349 free(nd, M_NFSMNT); 350 return (error); 351 } 352 353 /* 354 * Create the root mount point. 355 */ 356 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l); 357 if (error) 358 goto out; 359 printf("root on %s\n", nd->nd_root.ndm_host); 360 361 /* 362 * Link it into the mount list. 363 */ 364 simple_lock(&mountlist_slock); 365 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 366 simple_unlock(&mountlist_slock); 367 rootvp = vp; 368 mp->mnt_vnodecovered = NULLVP; 369 vfs_unbusy(mp); 370 371 /* Get root attributes (for the time). */ 372 error = VOP_GETATTR(vp, &attr, l->l_proc->p_ucred, l); 373 if (error) 374 panic("nfs_mountroot: getattr for root"); 375 n = attr.va_atime.tv_sec; 376 #ifdef DEBUG 377 printf("root time: 0x%lx\n", n); 378 #endif 379 setrootfstime(n); 380 381 out: 382 if (error) 383 nfs_boot_cleanup(nd, l); 384 free(nd, M_NFSMNT); 385 return (error); 386 } 387 388 /* 389 * Internal version of mount system call for diskless setup. 390 * Separate function because we used to call it twice. 391 * (once for root and once for swap) 392 */ 393 static int 394 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, l) 395 struct nfs_dlmount *ndmntp; 396 const char *mntname; /* mount point name */ 397 struct mount **mpp; 398 struct vnode **vpp; 399 struct lwp *l; 400 { 401 struct mount *mp; 402 struct mbuf *m; 403 int error; 404 405 vfs_rootmountalloc(MOUNT_NFS, mntname, &mp); 406 407 mp->mnt_op = &nfs_vfsops; 408 409 /* 410 * Historical practice expects NFS root file systems to 411 * be initially mounted r/w. 412 */ 413 mp->mnt_flag &= ~MNT_RDONLY; 414 415 /* Get mbuf for server sockaddr. */ 416 m = m_get(M_WAIT, MT_SONAME); 417 if (m == NULL) 418 panic("nfs_mountroot: mget soname for %s", mntname); 419 MCLAIM(m, &nfs_mowner); 420 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 421 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 422 423 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 424 ndmntp->ndm_args.hostname, vpp, l); 425 if (error) { 426 mp->mnt_op->vfs_refcount--; 427 vfs_unbusy(mp); 428 printf("nfs_mountroot: mount %s failed: %d\n", 429 mntname, error); 430 free(mp, M_MOUNT); 431 } else 432 *mpp = mp; 433 434 return (error); 435 } 436 437 void 438 nfs_decode_args(nmp, argp, l) 439 struct nfsmount *nmp; 440 struct nfs_args *argp; 441 struct lwp *l; 442 { 443 int s; 444 int adjsock; 445 int maxio; 446 447 s = splsoftnet(); 448 449 /* 450 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 451 * no sense in that context. 452 */ 453 if (argp->sotype == SOCK_STREAM) 454 argp->flags &= ~NFSMNT_NOCONN; 455 456 /* 457 * Cookie translation is not needed for v2, silently ignore it. 458 */ 459 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 460 NFSMNT_XLATECOOKIE) 461 argp->flags &= ~NFSMNT_XLATECOOKIE; 462 463 /* Re-bind if rsrvd port requested and wasn't on one */ 464 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 465 && (argp->flags & NFSMNT_RESVPORT); 466 /* Also re-bind if we're switching to/from a connected UDP socket */ 467 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 468 (argp->flags & NFSMNT_NOCONN)); 469 470 /* Update flags. */ 471 nmp->nm_flag = argp->flags; 472 splx(s); 473 474 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 475 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 476 if (nmp->nm_timeo < NFS_MINTIMEO) 477 nmp->nm_timeo = NFS_MINTIMEO; 478 else if (nmp->nm_timeo > NFS_MAXTIMEO) 479 nmp->nm_timeo = NFS_MAXTIMEO; 480 } 481 482 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 483 nmp->nm_retry = argp->retrans; 484 if (nmp->nm_retry > NFS_MAXREXMIT) 485 nmp->nm_retry = NFS_MAXREXMIT; 486 } 487 488 #ifndef NFS_V2_ONLY 489 if (argp->flags & NFSMNT_NFSV3) { 490 if (argp->sotype == SOCK_DGRAM) 491 maxio = NFS_MAXDGRAMDATA; 492 else 493 maxio = NFS_MAXDATA; 494 } else 495 #endif 496 maxio = NFS_V2MAXDATA; 497 498 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 499 int osize = nmp->nm_wsize; 500 nmp->nm_wsize = argp->wsize; 501 /* Round down to multiple of blocksize */ 502 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 503 if (nmp->nm_wsize <= 0) 504 nmp->nm_wsize = NFS_FABLKSIZE; 505 adjsock |= (nmp->nm_wsize != osize); 506 } 507 if (nmp->nm_wsize > maxio) 508 nmp->nm_wsize = maxio; 509 if (nmp->nm_wsize > MAXBSIZE) 510 nmp->nm_wsize = MAXBSIZE; 511 512 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 513 int osize = nmp->nm_rsize; 514 nmp->nm_rsize = argp->rsize; 515 /* Round down to multiple of blocksize */ 516 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 517 if (nmp->nm_rsize <= 0) 518 nmp->nm_rsize = NFS_FABLKSIZE; 519 adjsock |= (nmp->nm_rsize != osize); 520 } 521 if (nmp->nm_rsize > maxio) 522 nmp->nm_rsize = maxio; 523 if (nmp->nm_rsize > MAXBSIZE) 524 nmp->nm_rsize = MAXBSIZE; 525 526 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 527 nmp->nm_readdirsize = argp->readdirsize; 528 /* Round down to multiple of minimum blocksize */ 529 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 530 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 531 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 532 /* Bigger than buffer size makes no sense */ 533 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 534 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 535 } else if (argp->flags & NFSMNT_RSIZE) 536 nmp->nm_readdirsize = nmp->nm_rsize; 537 538 if (nmp->nm_readdirsize > maxio) 539 nmp->nm_readdirsize = maxio; 540 541 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 542 argp->maxgrouplist <= NFS_MAXGRPS) 543 nmp->nm_numgrps = argp->maxgrouplist; 544 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 545 argp->readahead <= NFS_MAXRAHEAD) 546 nmp->nm_readahead = argp->readahead; 547 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 548 argp->leaseterm <= NQ_MAXLEASE) 549 nmp->nm_leaseterm = argp->leaseterm; 550 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 551 argp->deadthresh <= NQ_NEVERDEAD) 552 nmp->nm_deadthresh = argp->deadthresh; 553 554 adjsock |= ((nmp->nm_sotype != argp->sotype) || 555 (nmp->nm_soproto != argp->proto)); 556 nmp->nm_sotype = argp->sotype; 557 nmp->nm_soproto = argp->proto; 558 559 if (nmp->nm_so && adjsock) { 560 nfs_safedisconnect(nmp); 561 if (nmp->nm_sotype == SOCK_DGRAM) 562 while (nfs_connect(nmp, (struct nfsreq *)0, l)) { 563 printf("nfs_args: retrying connect\n"); 564 (void) tsleep((caddr_t)&lbolt, 565 PSOCK, "nfscn3", 0); 566 } 567 } 568 } 569 570 /* 571 * VFS Operations. 572 * 573 * mount system call 574 * It seems a bit dumb to copyinstr() the host and path here and then 575 * memcpy() them in mountnfs(), but I wanted to detect errors before 576 * doing the sockargs() call because sockargs() allocates an mbuf and 577 * an error after that means that I have to release the mbuf. 578 */ 579 /* ARGSUSED */ 580 int 581 nfs_mount(mp, path, data, ndp, l) 582 struct mount *mp; 583 const char *path; 584 void *data; 585 struct nameidata *ndp; 586 struct lwp *l; 587 { 588 int error; 589 struct nfs_args args; 590 struct mbuf *nam; 591 struct nfsmount *nmp = VFSTONFS(mp); 592 struct sockaddr *sa; 593 struct vnode *vp; 594 char *pth, *hst; 595 struct proc *p; 596 size_t len; 597 u_char *nfh; 598 599 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 600 if (error) 601 return (error); 602 603 p = l->l_proc; 604 if (mp->mnt_flag & MNT_GETARGS) { 605 606 if (nmp == NULL) 607 return (EIO); 608 if (args.addr != NULL) { 609 sa = mtod(nmp->nm_nam, struct sockaddr *); 610 error = copyout(sa, args.addr, sa->sa_len); 611 if (error) 612 return (error); 613 args.addrlen = sa->sa_len; 614 } else 615 args.addrlen = 0; 616 617 args.version = NFS_ARGSVERSION; 618 args.sotype = nmp->nm_sotype; 619 args.proto = nmp->nm_soproto; 620 args.fh = NULL; 621 args.fhsize = 0; 622 args.flags = nmp->nm_flag; 623 args.wsize = nmp->nm_wsize; 624 args.rsize = nmp->nm_rsize; 625 args.readdirsize = nmp->nm_readdirsize; 626 args.timeo = nmp->nm_timeo; 627 args.retrans = nmp->nm_retry; 628 args.maxgrouplist = nmp->nm_numgrps; 629 args.readahead = nmp->nm_readahead; 630 args.leaseterm = nmp->nm_leaseterm; 631 args.deadthresh = nmp->nm_deadthresh; 632 args.hostname = NULL; 633 return (copyout(&args, data, sizeof(args))); 634 } 635 636 if (args.version != NFS_ARGSVERSION) 637 return (EPROGMISMATCH); 638 #ifdef NFS_V2_ONLY 639 if (args.flags & NFSMNT_NQNFS) 640 return (EPROGUNAVAIL); 641 if (args.flags & NFSMNT_NFSV3) 642 return (EPROGMISMATCH); 643 #endif 644 if (mp->mnt_flag & MNT_UPDATE) { 645 if (nmp == NULL) 646 return (EIO); 647 /* 648 * When doing an update, we can't change from or to 649 * v3 and/or nqnfs, or change cookie translation 650 */ 651 args.flags = (args.flags & 652 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 653 (nmp->nm_flag & 654 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 655 nfs_decode_args(nmp, &args, l); 656 return (0); 657 } 658 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 659 return (EINVAL); 660 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 661 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 662 if (error) 663 return (error); 664 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 665 error = copyinstr(path, pth, MNAMELEN - 1, &len); 666 if (error) 667 goto free_nfh; 668 memset(&pth[len], 0, MNAMELEN - len); 669 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 670 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 671 if (error) 672 goto free_pth; 673 memset(&hst[len], 0, MNAMELEN - len); 674 /* sockargs() call must be after above copyin() calls */ 675 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 676 if (error) 677 goto free_hst; 678 MCLAIM(nam, &nfs_mowner); 679 args.fh = nfh; 680 error = mountnfs(&args, mp, nam, pth, hst, &vp, l); 681 682 free_hst: 683 FREE(hst, M_TEMP); 684 free_pth: 685 FREE(pth, M_TEMP); 686 free_nfh: 687 FREE(nfh, M_TEMP); 688 689 return (error); 690 } 691 692 /* 693 * Common code for mount and mountroot 694 */ 695 int 696 mountnfs(argp, mp, nam, pth, hst, vpp, l) 697 struct nfs_args *argp; 698 struct mount *mp; 699 struct mbuf *nam; 700 const char *pth, *hst; 701 struct vnode **vpp; 702 struct lwp *l; 703 { 704 struct nfsmount *nmp; 705 struct nfsnode *np; 706 int error; 707 struct vattr *attrs; 708 struct ucred *cr; 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_niothreads = NFS_DEFAULT_NIOTHREADS; 717 nfs_getset_niothreads(TRUE); 718 } 719 720 if (mp->mnt_flag & MNT_UPDATE) { 721 nmp = VFSTONFS(mp); 722 /* update paths, file handles, etc, here XXX */ 723 m_freem(nam); 724 return (0); 725 } else { 726 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 727 M_NFSMNT, M_WAITOK); 728 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 729 mp->mnt_data = nmp; 730 TAILQ_INIT(&nmp->nm_uidlruhead); 731 TAILQ_INIT(&nmp->nm_bufq); 732 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 733 simple_lock_init(&nmp->nm_slock); 734 } 735 vfs_getnewfsid(mp); 736 nmp->nm_mountp = mp; 737 738 #ifndef NFS_V2_ONLY 739 if (argp->flags & NFSMNT_NQNFS) 740 mp->mnt_iflag |= IMNT_DTYPE; 741 #endif 742 743 #ifndef NFS_V2_ONLY 744 if ((argp->flags & NFSMNT_NFSV3) == 0) 745 #endif 746 /* 747 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 748 * will fill this in. 749 */ 750 nmp->nm_maxfilesize = 0xffffffffLL; 751 752 nmp->nm_timeo = NFS_TIMEO; 753 nmp->nm_retry = NFS_RETRANS; 754 nmp->nm_wsize = NFS_WSIZE; 755 nmp->nm_rsize = NFS_RSIZE; 756 nmp->nm_readdirsize = NFS_READDIRSIZE; 757 nmp->nm_numgrps = NFS_MAXGRPS; 758 nmp->nm_readahead = NFS_DEFRAHEAD; 759 nmp->nm_leaseterm = NQ_DEFLEASE; 760 nmp->nm_deadthresh = NQ_DEADTHRESH; 761 CIRCLEQ_INIT(&nmp->nm_timerhead); 762 nmp->nm_inprog = NULLVP; 763 error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, l); 764 if (error) 765 goto bad; 766 nmp->nm_nam = nam; 767 768 /* Set up the sockets and per-host congestion */ 769 nmp->nm_sotype = argp->sotype; 770 nmp->nm_soproto = argp->proto; 771 772 nfs_decode_args(nmp, argp, l); 773 774 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 775 mp->mnt_dev_bshift = DEV_BSHIFT; 776 777 /* 778 * For Connection based sockets (TCP,...) defer the connect until 779 * the first request, in case the server is not responding. 780 */ 781 if (nmp->nm_sotype == SOCK_DGRAM && 782 (error = nfs_connect(nmp, (struct nfsreq *)0, l))) 783 goto bad; 784 785 /* 786 * This is silly, but it has to be set so that vinifod() works. 787 * We do not want to do an nfs_statvfs() here since we can get 788 * stuck on a dead server and we are holding a lock on the mount 789 * point. 790 */ 791 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 792 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 793 if (error) 794 goto bad; 795 *vpp = NFSTOV(np); 796 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 797 VOP_GETATTR(*vpp, attrs, l->l_proc->p_ucred, l); 798 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 799 cr = crget(); 800 cr->cr_uid = attrs->va_uid; 801 cr->cr_gid = attrs->va_gid; 802 cr->cr_ngroups = 0; 803 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, l, cr); 804 crfree(cr); 805 } 806 FREE(attrs, M_TEMP); 807 808 /* 809 * A reference count is needed on the nfsnode representing the 810 * remote root. If this object is not persistent, then backward 811 * traversals of the mount point (i.e. "..") will not work if 812 * the nfsnode gets flushed out of the cache. Ufs does not have 813 * this problem, because one can identify root inodes by their 814 * number == ROOTINO (2). So, just unlock, but no rele. 815 */ 816 817 nmp->nm_vnode = *vpp; 818 VOP_UNLOCK(*vpp, 0); 819 820 nmp->nm_stats = iostat_alloc(IOSTAT_NFS); 821 nmp->nm_stats->io_parent = nmp; 822 /* generate a ficticious drive name for the nfs mount */ 823 MALLOC(nmp->nm_stats->io_name, char *, IOSTATNAMELEN, M_NFSMNT, 824 M_WAITOK); 825 snprintf(nmp->nm_stats->io_name, IOSTATNAMELEN, "nfs%u", 826 nfs_mount_count); 827 nfs_mount_count++; 828 829 return (0); 830 bad: 831 nfs_disconnect(nmp); 832 free((caddr_t)nmp, M_NFSMNT); 833 m_freem(nam); 834 return (error); 835 } 836 837 /* 838 * unmount system call 839 */ 840 int 841 nfs_unmount(mp, mntflags, l) 842 struct mount *mp; 843 int mntflags; 844 struct lwp *l; 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(). The VFS unmount() 865 * has done vput on this vnode, otherwise we would get deadlock! 866 */ 867 vp = nmp->nm_vnode; 868 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 869 if (error != 0) 870 return error; 871 872 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 873 vput(vp); 874 return (EBUSY); 875 } 876 877 /* 878 * Must handshake with nqnfs_clientd() if it is active. 879 */ 880 nmp->nm_iflag |= NFSMNT_DISMINPROG; 881 while (nmp->nm_inprog != NULLVP) 882 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 883 error = vflush(mp, vp, flags); 884 if (error) { 885 vput(vp); 886 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 887 return (error); 888 } 889 890 /* 891 * We are now committed to the unmount; mark the mount structure 892 * as doomed so that any sleepers kicked awake by nfs_disconnect 893 * will go away cleanly. 894 */ 895 nmp->nm_iflag |= NFSMNT_DISMNT; 896 897 /* 898 * Clean up the stats... note that we carefully avoid decrementing 899 * nfs_mount_count here for good reason - we may not be unmounting 900 * the last thing mounted. 901 */ 902 FREE(nmp->nm_stats->io_name, M_NFSMNT); 903 iostat_free(nmp->nm_stats); 904 905 /* 906 * There are two reference counts to get rid of here 907 * (see comment in mountnfs()). 908 */ 909 vrele(vp); 910 vput(vp); 911 vgone(vp); 912 nfs_disconnect(nmp); 913 m_freem(nmp->nm_nam); 914 915 /* 916 * For NQNFS, let the server daemon free the nfsmount structure. 917 */ 918 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 919 free((caddr_t)nmp, M_NFSMNT); 920 return (0); 921 } 922 923 /* 924 * Return root of a filesystem 925 */ 926 int 927 nfs_root(mp, vpp) 928 struct mount *mp; 929 struct vnode **vpp; 930 { 931 struct vnode *vp; 932 struct nfsmount *nmp; 933 int error; 934 935 nmp = VFSTONFS(mp); 936 vp = nmp->nm_vnode; 937 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 938 if (error != 0) 939 return error; 940 if (vp->v_type == VNON) 941 vp->v_type = VDIR; 942 vp->v_flag = VROOT; 943 *vpp = vp; 944 return (0); 945 } 946 947 extern int syncprt; 948 949 /* 950 * Flush out the buffer cache 951 */ 952 /* ARGSUSED */ 953 int 954 nfs_sync(mp, waitfor, cred, l) 955 struct mount *mp; 956 int waitfor; 957 struct ucred *cred; 958 struct lwp *l; 959 { 960 struct vnode *vp; 961 int error, allerror = 0; 962 963 /* 964 * Force stale buffer cache information to be flushed. 965 */ 966 loop: 967 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 968 /* 969 * If the vnode that we are about to sync is no longer 970 * associated with this mount point, start over. 971 */ 972 if (vp->v_mount != mp) 973 goto loop; 974 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 975 (LIST_EMPTY(&vp->v_dirtyblkhd) && 976 vp->v_uobj.uo_npages == 0)) 977 continue; 978 if (vget(vp, LK_EXCLUSIVE)) 979 goto loop; 980 error = VOP_FSYNC(vp, cred, 981 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, l); 982 if (error) 983 allerror = error; 984 vput(vp); 985 } 986 return (allerror); 987 } 988 989 /* 990 * NFS flat namespace lookup. 991 * Currently unsupported. 992 */ 993 /* ARGSUSED */ 994 int 995 nfs_vget(mp, ino, vpp) 996 struct mount *mp; 997 ino_t ino; 998 struct vnode **vpp; 999 { 1000 1001 return (EOPNOTSUPP); 1002 } 1003 1004 /* 1005 * Do that sysctl thang... 1006 */ 1007 static int 1008 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 1009 { 1010 int error; 1011 1012 nfs_getset_niothreads(0); 1013 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1014 if (error || newp == NULL) 1015 return (error); 1016 nfs_getset_niothreads(1); 1017 1018 return (0); 1019 } 1020 1021 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 1022 { 1023 1024 sysctl_createv(clog, 0, NULL, NULL, 1025 CTLFLAG_PERMANENT, 1026 CTLTYPE_NODE, "vfs", NULL, 1027 NULL, 0, NULL, 0, 1028 CTL_VFS, CTL_EOL); 1029 sysctl_createv(clog, 0, NULL, NULL, 1030 CTLFLAG_PERMANENT, 1031 CTLTYPE_NODE, "nfs", 1032 SYSCTL_DESCR("NFS vfs options"), 1033 NULL, 0, NULL, 0, 1034 CTL_VFS, 2, CTL_EOL); 1035 /* 1036 * XXX the "2" above could be dynamic, thereby eliminating one 1037 * more instance of the "number to vfs" mapping problem, but 1038 * "2" is the order as taken from sys/mount.h 1039 */ 1040 1041 sysctl_createv(clog, 0, NULL, NULL, 1042 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1043 CTLTYPE_STRUCT, "nfsstats", 1044 SYSCTL_DESCR("NFS operation statistics"), 1045 NULL, 0, &nfsstats, sizeof(nfsstats), 1046 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1047 sysctl_createv(clog, 0, NULL, NULL, 1048 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1049 CTLTYPE_INT, "iothreads", 1050 SYSCTL_DESCR("Number of NFS client processes desired"), 1051 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1052 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1053 } 1054 1055 /* 1056 * At this point, this should never happen 1057 */ 1058 /* ARGSUSED */ 1059 int 1060 nfs_fhtovp(mp, fhp, vpp) 1061 struct mount *mp; 1062 struct fid *fhp; 1063 struct vnode **vpp; 1064 { 1065 1066 return (EINVAL); 1067 } 1068 1069 /* 1070 * Vnode pointer to File handle, should never happen either 1071 */ 1072 /* ARGSUSED */ 1073 int 1074 nfs_vptofh(vp, fhp) 1075 struct vnode *vp; 1076 struct fid *fhp; 1077 { 1078 1079 return (EINVAL); 1080 } 1081 1082 /* 1083 * Vfs start routine, a no-op. 1084 */ 1085 /* ARGSUSED */ 1086 int 1087 nfs_start(mp, flags, l) 1088 struct mount *mp; 1089 int flags; 1090 struct lwp *l; 1091 { 1092 1093 return (0); 1094 } 1095 1096 /* 1097 * Do operations associated with quotas, not supported 1098 */ 1099 /* ARGSUSED */ 1100 int 1101 nfs_quotactl(mp, cmd, uid, arg, l) 1102 struct mount *mp; 1103 int cmd; 1104 uid_t uid; 1105 void *arg; 1106 struct lwp *l; 1107 { 1108 1109 return (EOPNOTSUPP); 1110 } 1111
Indexes created Wed Oct 01 07:09:59 GMT 2025