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sys/nfs/nfs_vfsops.c
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1 /* $NetBSD: nfs_vfsops.c,v 1.135.2.1 2004/05/29 09:04:02 tron 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 1.135.2.1 2004/05/29 09:04:02 tron 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/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/systm.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <netinet/in.h> 64 65 #include <nfs/rpcv2.h> 66 #include <nfs/nfsproto.h> 67 #include <nfs/nfsnode.h> 68 #include <nfs/nfs.h> 69 #include <nfs/nfsmount.h> 70 #include <nfs/xdr_subs.h> 71 #include <nfs/nfsm_subs.h> 72 #include <nfs/nfsdiskless.h> 73 #include <nfs/nqnfs.h> 74 #include <nfs/nfs_var.h> 75 76 extern struct nfsstats nfsstats; 77 extern int nfs_ticks; 78 79 MALLOC_DEFINE(M_NFSMNT, "NFS mount", "NFS mount structure"); 80 81 /* 82 * nfs vfs operations. 83 */ 84 85 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc; 86 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc; 87 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc; 88 89 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = { 90 &nfsv2_vnodeop_opv_desc, 91 &spec_nfsv2nodeop_opv_desc, 92 &fifo_nfsv2nodeop_opv_desc, 93 NULL, 94 }; 95 96 struct vfsops nfs_vfsops = { 97 MOUNT_NFS, 98 nfs_mount, 99 nfs_start, 100 nfs_unmount, 101 nfs_root, 102 nfs_quotactl, 103 nfs_statfs, 104 nfs_sync, 105 nfs_vget, 106 nfs_fhtovp, 107 nfs_vptofh, 108 nfs_vfs_init, 109 nfs_vfs_reinit, 110 nfs_vfs_done, 111 NULL, 112 nfs_mountroot, 113 nfs_checkexp, 114 nfs_vnodeopv_descs, 115 }; 116 117 extern u_int32_t nfs_procids[NFS_NPROCS]; 118 extern u_int32_t nfs_prog, nfs_vers; 119 120 static int nfs_mount_diskless __P((struct nfs_dlmount *, const char *, 121 struct mount **, struct vnode **, struct proc *)); 122 123 /* 124 * nfs statfs call 125 */ 126 int 127 nfs_statfs(mp, sbp, p) 128 struct mount *mp; 129 struct statfs *sbp; 130 struct proc *p; 131 { 132 struct vnode *vp; 133 struct nfs_statfs *sfp; 134 caddr_t cp; 135 u_int32_t *tl; 136 int32_t t1, t2; 137 caddr_t bpos, dpos, cp2; 138 struct nfsmount *nmp = VFSTONFS(mp); 139 int error = 0, retattr; 140 #ifdef NFS_V2_ONLY 141 const int v3 = 0; 142 #else 143 int v3 = (nmp->nm_flag & NFSMNT_NFSV3); 144 #endif 145 struct mbuf *mreq, *mrep = NULL, *md, *mb; 146 struct ucred *cred; 147 u_quad_t tquad; 148 struct nfsnode *np; 149 150 #ifndef nolint 151 sfp = (struct nfs_statfs *)0; 152 #endif 153 vp = nmp->nm_vnode; 154 np = VTONFS(vp); 155 cred = crget(); 156 cred->cr_ngroups = 0; 157 #ifndef NFS_V2_ONLY 158 if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0) 159 (void)nfs_fsinfo(nmp, vp, cred, p); 160 #endif 161 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 162 nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3)); 163 nfsm_fhtom(np, v3); 164 nfsm_request(np, NFSPROC_FSSTAT, p, cred); 165 if (v3) 166 nfsm_postop_attr(vp, retattr, 0); 167 if (error) { 168 if (mrep != NULL) { 169 if (mrep->m_next != NULL) 170 printf("nfs_vfsops: nfs_statfs would loose buffers\n"); 171 m_freem(mrep); 172 } 173 goto nfsmout; 174 } 175 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 176 #ifdef COMPAT_09 177 sbp->f_type = 2; 178 #else 179 sbp->f_type = 0; 180 #endif 181 sbp->f_flags = nmp->nm_flag; 182 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 183 if (v3) { 184 sbp->f_bsize = NFS_FABLKSIZE; 185 tquad = fxdr_hyper(&sfp->sf_tbytes); 186 sbp->f_blocks = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 187 tquad = fxdr_hyper(&sfp->sf_fbytes); 188 sbp->f_bfree = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 189 tquad = fxdr_hyper(&sfp->sf_abytes); 190 sbp->f_bavail = (long)((quad_t)tquad / (quad_t)NFS_FABLKSIZE); 191 tquad = fxdr_hyper(&sfp->sf_tfiles); 192 sbp->f_files = (long)tquad; 193 tquad = fxdr_hyper(&sfp->sf_ffiles); 194 sbp->f_ffree = (long)tquad; 195 } else { 196 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 197 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 198 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 199 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 200 sbp->f_files = 0; 201 sbp->f_ffree = 0; 202 } 203 copy_statfs_info(sbp, mp); 204 nfsm_reqdone; 205 crfree(cred); 206 return (error); 207 } 208 209 #ifndef NFS_V2_ONLY 210 /* 211 * nfs version 3 fsinfo rpc call 212 */ 213 int 214 nfs_fsinfo(nmp, vp, cred, p) 215 struct nfsmount *nmp; 216 struct vnode *vp; 217 struct ucred *cred; 218 struct proc *p; 219 { 220 struct nfsv3_fsinfo *fsp; 221 caddr_t cp; 222 int32_t t1, t2; 223 u_int32_t *tl, pref, max; 224 caddr_t bpos, dpos, cp2; 225 int error = 0, retattr; 226 struct mbuf *mreq, *mrep, *md, *mb; 227 u_int64_t maxfsize; 228 struct nfsnode *np = VTONFS(vp); 229 230 nfsstats.rpccnt[NFSPROC_FSINFO]++; 231 nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1)); 232 nfsm_fhtom(np, 1); 233 nfsm_request(np, NFSPROC_FSINFO, p, cred); 234 nfsm_postop_attr(vp, retattr, 0); 235 if (!error) { 236 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 237 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 238 if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 && 239 pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 240 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 241 ~(NFS_FABLKSIZE - 1); 242 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 243 if (max < nmp->nm_wsize && max > 0) { 244 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 245 if (nmp->nm_wsize == 0) 246 nmp->nm_wsize = max; 247 } 248 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 249 if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 && 250 pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 251 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 252 ~(NFS_FABLKSIZE - 1); 253 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 254 if (max < nmp->nm_rsize && max > 0) { 255 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 256 if (nmp->nm_rsize == 0) 257 nmp->nm_rsize = max; 258 } 259 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 260 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ) 261 nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) & 262 ~(NFS_DIRFRAGSIZ - 1); 263 if (max < nmp->nm_readdirsize && max > 0) { 264 nmp->nm_readdirsize = max & ~(NFS_DIRFRAGSIZ - 1); 265 if (nmp->nm_readdirsize == 0) 266 nmp->nm_readdirsize = max; 267 } 268 /* XXX */ 269 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 270 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 271 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 272 nmp->nm_maxfilesize = maxfsize; 273 nmp->nm_iflag |= NFSMNT_GOTFSINFO; 274 } 275 nfsm_reqdone; 276 return (error); 277 } 278 #endif 279 280 /* 281 * Mount a remote root fs via. NFS. It goes like this: 282 * - Call nfs_boot_init() to fill in the nfs_diskless struct 283 * - build the rootfs mount point and call mountnfs() to do the rest. 284 */ 285 int 286 nfs_mountroot() 287 { 288 struct nfs_diskless *nd; 289 struct vattr attr; 290 struct mount *mp; 291 struct vnode *vp; 292 struct proc *procp; 293 long n; 294 int error; 295 296 procp = curproc; /* XXX */ 297 298 if (root_device->dv_class != DV_IFNET) 299 return (ENODEV); 300 301 /* 302 * XXX time must be non-zero when we init the interface or else 303 * the arp code will wedge. [Fixed now in if_ether.c] 304 * However, the NFS attribute cache gives false "hits" when 305 * time.tv_sec < NFS_ATTRTIMEO(np) so keep this in for now. 306 */ 307 if (time.tv_sec < NFS_MAXATTRTIMO) 308 time.tv_sec = NFS_MAXATTRTIMO; 309 310 /* 311 * Call nfs_boot_init() to fill in the nfs_diskless struct. 312 * Side effect: Finds and configures a network interface. 313 */ 314 nd = malloc(sizeof(*nd), M_NFSMNT, M_WAITOK); 315 memset((caddr_t)nd, 0, sizeof(*nd)); 316 error = nfs_boot_init(nd, procp); 317 if (error) { 318 free(nd, M_NFSMNT); 319 return (error); 320 } 321 322 /* 323 * Create the root mount point. 324 */ 325 error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, procp); 326 if (error) 327 goto out; 328 printf("root on %s\n", nd->nd_root.ndm_host); 329 330 /* 331 * Link it into the mount list. 332 */ 333 simple_lock(&mountlist_slock); 334 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 335 simple_unlock(&mountlist_slock); 336 rootvp = vp; 337 mp->mnt_vnodecovered = NULLVP; 338 vfs_unbusy(mp); 339 340 /* Get root attributes (for the time). */ 341 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 342 if (error) 343 panic("nfs_mountroot: getattr for root"); 344 n = attr.va_atime.tv_sec; 345 #ifdef DEBUG 346 printf("root time: 0x%lx\n", n); 347 #endif 348 inittodr(n); 349 350 out: 351 if (error) 352 nfs_boot_cleanup(nd, procp); 353 free(nd, M_NFSMNT); 354 return (error); 355 } 356 357 /* 358 * Internal version of mount system call for diskless setup. 359 * Separate function because we used to call it twice. 360 * (once for root and once for swap) 361 */ 362 static int 363 nfs_mount_diskless(ndmntp, mntname, mpp, vpp, p) 364 struct nfs_dlmount *ndmntp; 365 const char *mntname; /* mount point name */ 366 struct mount **mpp; 367 struct vnode **vpp; 368 struct proc *p; 369 { 370 struct mount *mp; 371 struct mbuf *m; 372 int error; 373 374 vfs_rootmountalloc(MOUNT_NFS, (char *)mntname, &mp); 375 376 mp->mnt_op = &nfs_vfsops; 377 378 /* 379 * Historical practice expects NFS root file systems to 380 * be initially mounted r/w. 381 */ 382 mp->mnt_flag &= ~MNT_RDONLY; 383 384 /* Get mbuf for server sockaddr. */ 385 m = m_get(M_WAIT, MT_SONAME); 386 if (m == NULL) 387 panic("nfs_mountroot: mget soname for %s", mntname); 388 MCLAIM(m, &nfs_mowner); 389 memcpy(mtod(m, caddr_t), (caddr_t)ndmntp->ndm_args.addr, 390 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 391 392 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 393 ndmntp->ndm_args.hostname, vpp, p); 394 if (error) { 395 mp->mnt_op->vfs_refcount--; 396 vfs_unbusy(mp); 397 printf("nfs_mountroot: mount %s failed: %d\n", 398 mntname, error); 399 free(mp, M_MOUNT); 400 } else 401 *mpp = mp; 402 403 return (error); 404 } 405 406 void 407 nfs_decode_args(nmp, argp) 408 struct nfsmount *nmp; 409 struct nfs_args *argp; 410 { 411 int s; 412 int adjsock; 413 int maxio; 414 415 s = splsoftnet(); 416 417 /* 418 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 419 * no sense in that context. 420 */ 421 if (argp->sotype == SOCK_STREAM) 422 argp->flags &= ~NFSMNT_NOCONN; 423 424 /* 425 * Cookie translation is not needed for v2, silently ignore it. 426 */ 427 if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) == 428 NFSMNT_XLATECOOKIE) 429 argp->flags &= ~NFSMNT_XLATECOOKIE; 430 431 /* Re-bind if rsrvd port requested and wasn't on one */ 432 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 433 && (argp->flags & NFSMNT_RESVPORT); 434 /* Also re-bind if we're switching to/from a connected UDP socket */ 435 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 436 (argp->flags & NFSMNT_NOCONN)); 437 438 /* Update flags. */ 439 nmp->nm_flag = argp->flags; 440 splx(s); 441 442 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 443 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 444 if (nmp->nm_timeo < NFS_MINTIMEO) 445 nmp->nm_timeo = NFS_MINTIMEO; 446 else if (nmp->nm_timeo > NFS_MAXTIMEO) 447 nmp->nm_timeo = NFS_MAXTIMEO; 448 } 449 450 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 451 nmp->nm_retry = argp->retrans; 452 if (nmp->nm_retry > NFS_MAXREXMIT) 453 nmp->nm_retry = NFS_MAXREXMIT; 454 } 455 456 #ifndef NFS_V2_ONLY 457 if (argp->flags & NFSMNT_NFSV3) { 458 if (argp->sotype == SOCK_DGRAM) 459 maxio = NFS_MAXDGRAMDATA; 460 else 461 maxio = NFS_MAXDATA; 462 } else 463 #endif 464 maxio = NFS_V2MAXDATA; 465 466 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 467 int osize = nmp->nm_wsize; 468 nmp->nm_wsize = argp->wsize; 469 /* Round down to multiple of blocksize */ 470 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 471 if (nmp->nm_wsize <= 0) 472 nmp->nm_wsize = NFS_FABLKSIZE; 473 adjsock |= (nmp->nm_wsize != osize); 474 } 475 if (nmp->nm_wsize > maxio) 476 nmp->nm_wsize = maxio; 477 if (nmp->nm_wsize > MAXBSIZE) 478 nmp->nm_wsize = MAXBSIZE; 479 480 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 481 int osize = nmp->nm_rsize; 482 nmp->nm_rsize = argp->rsize; 483 /* Round down to multiple of blocksize */ 484 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 485 if (nmp->nm_rsize <= 0) 486 nmp->nm_rsize = NFS_FABLKSIZE; 487 adjsock |= (nmp->nm_rsize != osize); 488 } 489 if (nmp->nm_rsize > maxio) 490 nmp->nm_rsize = maxio; 491 if (nmp->nm_rsize > MAXBSIZE) 492 nmp->nm_rsize = MAXBSIZE; 493 494 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 495 nmp->nm_readdirsize = argp->readdirsize; 496 /* Round down to multiple of minimum blocksize */ 497 nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1); 498 if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ) 499 nmp->nm_readdirsize = NFS_DIRFRAGSIZ; 500 /* Bigger than buffer size makes no sense */ 501 if (nmp->nm_readdirsize > NFS_DIRBLKSIZ) 502 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 503 } else if (argp->flags & NFSMNT_RSIZE) 504 nmp->nm_readdirsize = nmp->nm_rsize; 505 506 if (nmp->nm_readdirsize > maxio) 507 nmp->nm_readdirsize = maxio; 508 509 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 510 argp->maxgrouplist <= NFS_MAXGRPS) 511 nmp->nm_numgrps = argp->maxgrouplist; 512 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 513 argp->readahead <= NFS_MAXRAHEAD) 514 nmp->nm_readahead = argp->readahead; 515 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 && 516 argp->leaseterm <= NQ_MAXLEASE) 517 nmp->nm_leaseterm = argp->leaseterm; 518 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 && 519 argp->deadthresh <= NQ_NEVERDEAD) 520 nmp->nm_deadthresh = argp->deadthresh; 521 522 adjsock |= ((nmp->nm_sotype != argp->sotype) || 523 (nmp->nm_soproto != argp->proto)); 524 nmp->nm_sotype = argp->sotype; 525 nmp->nm_soproto = argp->proto; 526 527 if (nmp->nm_so && adjsock) { 528 nfs_safedisconnect(nmp); 529 if (nmp->nm_sotype == SOCK_DGRAM) 530 while (nfs_connect(nmp, (struct nfsreq *)0)) { 531 printf("nfs_args: retrying connect\n"); 532 (void) tsleep((caddr_t)&lbolt, 533 PSOCK, "nfscn3", 0); 534 } 535 } 536 } 537 538 /* 539 * VFS Operations. 540 * 541 * mount system call 542 * It seems a bit dumb to copyinstr() the host and path here and then 543 * memcpy() them in mountnfs(), but I wanted to detect errors before 544 * doing the sockargs() call because sockargs() allocates an mbuf and 545 * an error after that means that I have to release the mbuf. 546 */ 547 /* ARGSUSED */ 548 int 549 nfs_mount(mp, path, data, ndp, p) 550 struct mount *mp; 551 const char *path; 552 void *data; 553 struct nameidata *ndp; 554 struct proc *p; 555 { 556 int error; 557 struct nfs_args args; 558 struct mbuf *nam; 559 struct nfsmount *nmp = VFSTONFS(mp); 560 struct sockaddr *sa; 561 struct vnode *vp; 562 char *pth, *hst; 563 size_t len; 564 u_char *nfh; 565 566 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 567 if (error) 568 return (error); 569 570 if (mp->mnt_flag & MNT_GETARGS) { 571 572 if (nmp == NULL) 573 return (EIO); 574 if (args.addr != NULL) { 575 sa = mtod(nmp->nm_nam, struct sockaddr *); 576 error = copyout(sa, args.addr, sa->sa_len); 577 if (error) 578 return (error); 579 args.addrlen = sa->sa_len; 580 } else 581 args.addrlen = 0; 582 583 args.version = NFS_ARGSVERSION; 584 args.sotype = nmp->nm_sotype; 585 args.proto = nmp->nm_soproto; 586 args.fh = NULL; 587 args.fhsize = 0; 588 args.flags = nmp->nm_flag; 589 args.wsize = nmp->nm_wsize; 590 args.rsize = nmp->nm_rsize; 591 args.readdirsize = nmp->nm_readdirsize; 592 args.timeo = nmp->nm_timeo; 593 args.retrans = nmp->nm_retry; 594 args.maxgrouplist = nmp->nm_numgrps; 595 args.readahead = nmp->nm_readahead; 596 args.leaseterm = nmp->nm_leaseterm; 597 args.deadthresh = nmp->nm_deadthresh; 598 args.hostname = NULL; 599 return (copyout(&args, data, sizeof(args))); 600 } 601 602 if (args.version != NFS_ARGSVERSION) 603 return (EPROGMISMATCH); 604 #ifdef NFS_V2_ONLY 605 if (args.flags & NFSMNT_NQNFS) 606 return (EPROGUNAVAIL); 607 if (args.flags & NFSMNT_NFSV3) 608 return (EPROGMISMATCH); 609 #endif 610 if (mp->mnt_flag & MNT_UPDATE) { 611 if (nmp == NULL) 612 return (EIO); 613 /* 614 * When doing an update, we can't change from or to 615 * v3 and/or nqnfs, or change cookie translation 616 */ 617 args.flags = (args.flags & 618 ~(NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)) | 619 (nmp->nm_flag & 620 (NFSMNT_NFSV3|NFSMNT_NQNFS|NFSMNT_XLATECOOKIE)); 621 nfs_decode_args(nmp, &args); 622 return (0); 623 } 624 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 625 return (EINVAL); 626 MALLOC(nfh, u_char *, NFSX_V3FHMAX, M_TEMP, M_WAITOK); 627 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 628 if (error) 629 return (error); 630 MALLOC(pth, char *, MNAMELEN, M_TEMP, M_WAITOK); 631 error = copyinstr(path, pth, MNAMELEN - 1, &len); 632 if (error) 633 goto free_nfh; 634 memset(&pth[len], 0, MNAMELEN - len); 635 MALLOC(hst, char *, MNAMELEN, M_TEMP, M_WAITOK); 636 error = copyinstr(args.hostname, hst, MNAMELEN - 1, &len); 637 if (error) 638 goto free_pth; 639 memset(&hst[len], 0, MNAMELEN - len); 640 /* sockargs() call must be after above copyin() calls */ 641 error = sockargs(&nam, (caddr_t)args.addr, args.addrlen, MT_SONAME); 642 if (error) 643 goto free_hst; 644 MCLAIM(nam, &nfs_mowner); 645 args.fh = nfh; 646 error = mountnfs(&args, mp, nam, pth, hst, &vp, p); 647 648 free_hst: 649 FREE(hst, M_TEMP); 650 free_pth: 651 FREE(pth, M_TEMP); 652 free_nfh: 653 FREE(nfh, M_TEMP); 654 655 return (error); 656 } 657 658 /* 659 * Common code for mount and mountroot 660 */ 661 int 662 mountnfs(argp, mp, nam, pth, hst, vpp, p) 663 struct nfs_args *argp; 664 struct mount *mp; 665 struct mbuf *nam; 666 const char *pth, *hst; 667 struct vnode **vpp; 668 struct proc *p; 669 { 670 struct nfsmount *nmp; 671 struct nfsnode *np; 672 int error; 673 struct vattr *attrs; 674 struct ucred *cr; 675 676 /* 677 * If the number of nfs iothreads to use has never 678 * been set, create a reasonable number of them. 679 */ 680 681 if (nfs_niothreads < 0) { 682 nfs_niothreads = NFS_DEFAULT_NIOTHREADS; 683 nfs_getset_niothreads(TRUE); 684 } 685 686 if (mp->mnt_flag & MNT_UPDATE) { 687 nmp = VFSTONFS(mp); 688 /* update paths, file handles, etc, here XXX */ 689 m_freem(nam); 690 return (0); 691 } else { 692 MALLOC(nmp, struct nfsmount *, sizeof (struct nfsmount), 693 M_NFSMNT, M_WAITOK); 694 memset((caddr_t)nmp, 0, sizeof (struct nfsmount)); 695 mp->mnt_data = nmp; 696 TAILQ_INIT(&nmp->nm_uidlruhead); 697 TAILQ_INIT(&nmp->nm_bufq); 698 lockinit(&nmp->nm_writeverflock, PRIBIO, "nfswverf", 0, 0); 699 simple_lock_init(&nmp->nm_slock); 700 } 701 vfs_getnewfsid(mp); 702 nmp->nm_mountp = mp; 703 704 #ifndef NFS_V2_ONLY 705 if (argp->flags & NFSMNT_NQNFS) 706 /* 707 * We have to set mnt_maxsymlink to a non-zero value so 708 * that COMPAT_43 routines will know that we are setting 709 * the d_type field in directories (and can zero it for 710 * unsuspecting binaries). 711 */ 712 mp->mnt_maxsymlinklen = 1; 713 #endif 714 715 #ifndef NFS_V2_ONLY 716 if ((argp->flags & NFSMNT_NFSV3) == 0) 717 #endif 718 /* 719 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo 720 * will fill this in. 721 */ 722 nmp->nm_maxfilesize = 0xffffffffLL; 723 724 nmp->nm_timeo = NFS_TIMEO; 725 nmp->nm_retry = NFS_RETRANS; 726 nmp->nm_wsize = NFS_WSIZE; 727 nmp->nm_rsize = NFS_RSIZE; 728 nmp->nm_readdirsize = NFS_READDIRSIZE; 729 nmp->nm_numgrps = NFS_MAXGRPS; 730 nmp->nm_readahead = NFS_DEFRAHEAD; 731 nmp->nm_leaseterm = NQ_DEFLEASE; 732 nmp->nm_deadthresh = NQ_DEADTHRESH; 733 CIRCLEQ_INIT(&nmp->nm_timerhead); 734 nmp->nm_inprog = NULLVP; 735 #ifdef COMPAT_09 736 mp->mnt_stat.f_type = 2; 737 #else 738 mp->mnt_stat.f_type = 0; 739 #endif 740 error = set_statfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE, mp, p); 741 if (error) 742 goto bad; 743 nmp->nm_nam = nam; 744 745 /* Set up the sockets and per-host congestion */ 746 nmp->nm_sotype = argp->sotype; 747 nmp->nm_soproto = argp->proto; 748 749 nfs_decode_args(nmp, argp); 750 751 mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1; 752 mp->mnt_dev_bshift = DEV_BSHIFT; 753 754 /* 755 * For Connection based sockets (TCP,...) defer the connect until 756 * the first request, in case the server is not responding. 757 */ 758 if (nmp->nm_sotype == SOCK_DGRAM && 759 (error = nfs_connect(nmp, (struct nfsreq *)0))) 760 goto bad; 761 762 /* 763 * This is silly, but it has to be set so that vinifod() works. 764 * We do not want to do an nfs_statfs() here since we can get 765 * stuck on a dead server and we are holding a lock on the mount 766 * point. 767 */ 768 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 769 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 770 if (error) 771 goto bad; 772 *vpp = NFSTOV(np); 773 MALLOC(attrs, struct vattr *, sizeof(struct vattr), M_TEMP, M_WAITOK); 774 VOP_GETATTR(*vpp, attrs, p->p_ucred, p); 775 if ((nmp->nm_flag & NFSMNT_NFSV3) && ((*vpp)->v_type == VDIR)) { 776 cr = crget(); 777 cr->cr_uid = attrs->va_uid; 778 cr->cr_gid = attrs->va_gid; 779 cr->cr_ngroups = 0; 780 nfs_cookieheuristic(*vpp, &nmp->nm_iflag, p, cr); 781 crfree(cr); 782 } 783 FREE(attrs, M_TEMP); 784 785 /* 786 * A reference count is needed on the nfsnode representing the 787 * remote root. If this object is not persistent, then backward 788 * traversals of the mount point (i.e. "..") will not work if 789 * the nfsnode gets flushed out of the cache. Ufs does not have 790 * this problem, because one can identify root inodes by their 791 * number == ROOTINO (2). So, just unlock, but no rele. 792 */ 793 794 nmp->nm_vnode = *vpp; 795 VOP_UNLOCK(*vpp, 0); 796 797 return (0); 798 bad: 799 nfs_disconnect(nmp); 800 free((caddr_t)nmp, M_NFSMNT); 801 m_freem(nam); 802 return (error); 803 } 804 805 /* 806 * unmount system call 807 */ 808 int 809 nfs_unmount(mp, mntflags, p) 810 struct mount *mp; 811 int mntflags; 812 struct proc *p; 813 { 814 struct nfsmount *nmp; 815 struct vnode *vp; 816 int error, flags = 0; 817 818 if (mntflags & MNT_FORCE) 819 flags |= FORCECLOSE; 820 nmp = VFSTONFS(mp); 821 /* 822 * Goes something like this.. 823 * - Check for activity on the root vnode (other than ourselves). 824 * - Call vflush() to clear out vnodes for this file system, 825 * except for the root vnode. 826 * - Decrement reference on the vnode representing remote root. 827 * - Close the socket 828 * - Free up the data structures 829 */ 830 /* 831 * We need to decrement the ref. count on the nfsnode representing 832 * the remote root. See comment in mountnfs(). The VFS unmount() 833 * has done vput on this vnode, otherwise we would get deadlock! 834 */ 835 vp = nmp->nm_vnode; 836 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 837 if (error != 0) 838 return error; 839 840 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 841 vput(vp); 842 return (EBUSY); 843 } 844 845 /* 846 * Must handshake with nqnfs_clientd() if it is active. 847 */ 848 nmp->nm_iflag |= NFSMNT_DISMINPROG; 849 while (nmp->nm_inprog != NULLVP) 850 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 851 error = vflush(mp, vp, flags); 852 if (error) { 853 vput(vp); 854 nmp->nm_iflag &= ~NFSMNT_DISMINPROG; 855 return (error); 856 } 857 858 /* 859 * We are now committed to the unmount; mark the mount structure 860 * as doomed so that any sleepers kicked awake by nfs_disconnect 861 * will go away cleanly. 862 */ 863 nmp->nm_iflag |= NFSMNT_DISMNT; 864 865 /* 866 * There are two reference counts to get rid of here 867 * (see comment in mountnfs()). 868 */ 869 vrele(vp); 870 vput(vp); 871 vgone(vp); 872 nfs_disconnect(nmp); 873 m_freem(nmp->nm_nam); 874 875 /* 876 * For NQNFS, let the server daemon free the nfsmount structure. 877 */ 878 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 879 free((caddr_t)nmp, M_NFSMNT); 880 return (0); 881 } 882 883 /* 884 * Return root of a filesystem 885 */ 886 int 887 nfs_root(mp, vpp) 888 struct mount *mp; 889 struct vnode **vpp; 890 { 891 struct vnode *vp; 892 struct nfsmount *nmp; 893 int error; 894 895 nmp = VFSTONFS(mp); 896 vp = nmp->nm_vnode; 897 error = vget(vp, LK_EXCLUSIVE | LK_RETRY); 898 if (error != 0) 899 return error; 900 if (vp->v_type == VNON) 901 vp->v_type = VDIR; 902 vp->v_flag = VROOT; 903 *vpp = vp; 904 return (0); 905 } 906 907 extern int syncprt; 908 909 /* 910 * Flush out the buffer cache 911 */ 912 /* ARGSUSED */ 913 int 914 nfs_sync(mp, waitfor, cred, p) 915 struct mount *mp; 916 int waitfor; 917 struct ucred *cred; 918 struct proc *p; 919 { 920 struct vnode *vp; 921 int error, allerror = 0; 922 923 /* 924 * Force stale buffer cache information to be flushed. 925 */ 926 loop: 927 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 928 /* 929 * If the vnode that we are about to sync is no longer 930 * associated with this mount point, start over. 931 */ 932 if (vp->v_mount != mp) 933 goto loop; 934 if (waitfor == MNT_LAZY || VOP_ISLOCKED(vp) || 935 (LIST_EMPTY(&vp->v_dirtyblkhd) && 936 vp->v_uobj.uo_npages == 0)) 937 continue; 938 if (vget(vp, LK_EXCLUSIVE)) 939 goto loop; 940 error = VOP_FSYNC(vp, cred, 941 waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0, p); 942 if (error) 943 allerror = error; 944 vput(vp); 945 } 946 return (allerror); 947 } 948 949 /* 950 * NFS flat namespace lookup. 951 * Currently unsupported. 952 */ 953 /* ARGSUSED */ 954 int 955 nfs_vget(mp, ino, vpp) 956 struct mount *mp; 957 ino_t ino; 958 struct vnode **vpp; 959 { 960 961 return (EOPNOTSUPP); 962 } 963 964 /* 965 * Do that sysctl thang... 966 */ 967 static int 968 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS) 969 { 970 int error; 971 972 nfs_getset_niothreads(0); 973 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 974 if (error || newp == NULL) 975 return (error); 976 nfs_getset_niothreads(1); 977 978 return (0); 979 } 980 981 SYSCTL_SETUP(sysctl_vfs_nfs_setup, "sysctl vfs.nfs subtree setup") 982 { 983 984 sysctl_createv(clog, 0, NULL, NULL, 985 CTLFLAG_PERMANENT, 986 CTLTYPE_NODE, "vfs", NULL, 987 NULL, 0, NULL, 0, 988 CTL_VFS, CTL_EOL); 989 sysctl_createv(clog, 0, NULL, NULL, 990 CTLFLAG_PERMANENT, 991 CTLTYPE_NODE, "nfs", 992 SYSCTL_DESCR("NFS vfs options"), 993 NULL, 0, NULL, 0, 994 CTL_VFS, 2, CTL_EOL); 995 /* 996 * XXX the "2" above could be dynamic, thereby eliminating one 997 * more instance of the "number to vfs" mapping problem, but 998 * "2" is the order as taken from sys/mount.h 999 */ 1000 1001 sysctl_createv(clog, 0, NULL, NULL, 1002 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1003 CTLTYPE_STRUCT, "nfsstats", 1004 SYSCTL_DESCR("NFS operation statistics"), 1005 NULL, 0, &nfsstats, sizeof(nfsstats), 1006 CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL); 1007 sysctl_createv(clog, 0, NULL, NULL, 1008 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1009 CTLTYPE_INT, "iothreads", 1010 SYSCTL_DESCR("Number of NFS client processes desired"), 1011 sysctl_vfs_nfs_iothreads, 0, &nfs_niothreads, 0, 1012 CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL); 1013 } 1014 1015 /* 1016 * At this point, this should never happen 1017 */ 1018 /* ARGSUSED */ 1019 int 1020 nfs_fhtovp(mp, fhp, vpp) 1021 struct mount *mp; 1022 struct fid *fhp; 1023 struct vnode **vpp; 1024 { 1025 1026 return (EINVAL); 1027 } 1028 1029 /* ARGSUSED */ 1030 int 1031 nfs_checkexp(mp, nam, exflagsp, credanonp) 1032 struct mount *mp; 1033 struct mbuf *nam; 1034 int *exflagsp; 1035 struct ucred **credanonp; 1036 { 1037 1038 return (EINVAL); 1039 } 1040 1041 /* 1042 * Vnode pointer to File handle, should never happen either 1043 */ 1044 /* ARGSUSED */ 1045 int 1046 nfs_vptofh(vp, fhp) 1047 struct vnode *vp; 1048 struct fid *fhp; 1049 { 1050 1051 return (EINVAL); 1052 } 1053 1054 /* 1055 * Vfs start routine, a no-op. 1056 */ 1057 /* ARGSUSED */ 1058 int 1059 nfs_start(mp, flags, p) 1060 struct mount *mp; 1061 int flags; 1062 struct proc *p; 1063 { 1064 1065 return (0); 1066 } 1067 1068 /* 1069 * Do operations associated with quotas, not supported 1070 */ 1071 /* ARGSUSED */ 1072 int 1073 nfs_quotactl(mp, cmd, uid, arg, p) 1074 struct mount *mp; 1075 int cmd; 1076 uid_t uid; 1077 caddr_t arg; 1078 struct proc *p; 1079 { 1080 1081 return (EOPNOTSUPP); 1082 }
Cache object: 0402efb6976118186bee7a0366a2be7b
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