Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/nfs/nfs_vfsops.c
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1 /* 2 * Copyright (c) 1989, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 37 * $FreeBSD$ 38 */ 39 40 #include "opt_bootp.h" 41 42 #include <sys/param.h> 43 #include <sys/sockio.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/kernel.h> 47 #include <sys/sysctl.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/mbuf.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/systm.h> 54 55 #include <vm/vm.h> 56 #include <vm/vm_extern.h> 57 #include <vm/vm_zone.h> 58 59 #include <net/if.h> 60 #include <net/route.h> 61 #include <netinet/in.h> 62 63 #include <nfs/rpcv2.h> 64 #include <nfs/nfsproto.h> 65 #include <nfs/nfs.h> 66 #include <nfs/nfsnode.h> 67 #include <nfs/nfsmount.h> 68 #include <nfs/xdr_subs.h> 69 #include <nfs/nfsm_subs.h> 70 #include <nfs/nfsdiskless.h> 71 #include <nfs/nqnfs.h> 72 73 #include <machine/limits.h> 74 75 extern int nfs_mountroot __P((struct mount *mp)); 76 77 extern int nfs_ticks; 78 79 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 80 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 81 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 82 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 83 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 84 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 85 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 86 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 87 88 vm_zone_t nfsmount_zone; 89 90 struct nfsstats nfsstats; 91 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 92 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 93 &nfsstats, nfsstats, ""); 94 static int nfs_ip_paranoia = 1; 95 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 96 &nfs_ip_paranoia, 0, ""); 97 #ifdef NFS_DEBUG 98 int nfs_debug; 99 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 100 #endif 101 102 static int nfs_iosize __P((struct nfsmount *nmp)); 103 static void nfs_decode_args __P((struct nfsmount *nmp, 104 struct nfs_args *argp)); 105 static int mountnfs __P((struct nfs_args *,struct mount *, 106 struct sockaddr *,char *,char *,struct vnode **)); 107 static int nfs_mount __P(( struct mount *mp, char *path, caddr_t data, 108 struct nameidata *ndp, struct proc *p)); 109 static int nfs_unmount __P(( struct mount *mp, int mntflags, 110 struct proc *p)); 111 static int nfs_root __P(( struct mount *mp, struct vnode **vpp)); 112 static int nfs_statfs __P(( struct mount *mp, struct statfs *sbp, 113 struct proc *p)); 114 static int nfs_sync __P(( struct mount *mp, int waitfor, 115 struct ucred *cred, struct proc *p)); 116 117 /* 118 * nfs vfs operations. 119 */ 120 static struct vfsops nfs_vfsops = { 121 nfs_mount, 122 vfs_stdstart, 123 nfs_unmount, 124 nfs_root, 125 vfs_stdquotactl, 126 nfs_statfs, 127 nfs_sync, 128 vfs_stdvget, 129 vfs_stdfhtovp, /* shouldn't happen */ 130 vfs_stdcheckexp, 131 vfs_stdvptofh, /* shouldn't happen */ 132 nfs_init, 133 nfs_uninit, 134 vfs_stdextattrctl, 135 }; 136 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 137 138 /* 139 * This structure must be filled in by a primary bootstrap or bootstrap 140 * server for a diskless/dataless machine. It is initialized below just 141 * to ensure that it is allocated to initialized data (.data not .bss). 142 */ 143 struct nfs_diskless nfs_diskless = { { { 0 } } }; 144 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 145 int nfs_diskless_valid = 0; 146 147 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 148 &nfs_diskless_valid, 0, ""); 149 150 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 151 nfsv3_diskless.root_hostnam, 0, ""); 152 153 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 154 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 155 "%Ssockaddr_in", ""); 156 157 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 158 nfsv3_diskless.swap_hostnam, 0, ""); 159 160 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 161 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 162 "%Ssockaddr_in",""); 163 164 165 void nfsargs_ntoh __P((struct nfs_args *)); 166 static int nfs_mountdiskless __P((char *, char *, int, 167 struct sockaddr_in *, struct nfs_args *, 168 struct proc *, struct vnode **, 169 struct mount **)); 170 static void nfs_convert_diskless __P((void)); 171 static void nfs_convert_oargs __P((struct nfs_args *args, 172 struct onfs_args *oargs)); 173 174 static int 175 nfs_iosize(nmp) 176 struct nfsmount* nmp; 177 { 178 int iosize; 179 180 /* 181 * Calculate the size used for io buffers. Use the larger 182 * of the two sizes to minimise nfs requests but make sure 183 * that it is at least one VM page to avoid wasting buffer 184 * space. 185 */ 186 iosize = max(nmp->nm_rsize, nmp->nm_wsize); 187 if (iosize < PAGE_SIZE) iosize = PAGE_SIZE; 188 return iosize; 189 } 190 191 static void 192 nfs_convert_oargs(args, oargs) 193 struct nfs_args *args; 194 struct onfs_args *oargs; 195 { 196 args->version = NFS_ARGSVERSION; 197 args->addr = oargs->addr; 198 args->addrlen = oargs->addrlen; 199 args->sotype = oargs->sotype; 200 args->proto = oargs->proto; 201 args->fh = oargs->fh; 202 args->fhsize = oargs->fhsize; 203 args->flags = oargs->flags; 204 args->wsize = oargs->wsize; 205 args->rsize = oargs->rsize; 206 args->readdirsize = oargs->readdirsize; 207 args->timeo = oargs->timeo; 208 args->retrans = oargs->retrans; 209 args->maxgrouplist = oargs->maxgrouplist; 210 args->readahead = oargs->readahead; 211 args->leaseterm = oargs->leaseterm; 212 args->deadthresh = oargs->deadthresh; 213 args->hostname = oargs->hostname; 214 } 215 216 static void 217 nfs_convert_diskless() 218 { 219 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 220 sizeof(struct ifaliasreq)); 221 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 222 sizeof(struct sockaddr_in)); 223 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 224 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 225 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 226 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 227 sizeof(struct sockaddr_in)); 228 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 229 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 230 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 231 sizeof(struct ucred)); 232 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 233 nfsv3_diskless.root_fhsize = NFSX_V2FH; 234 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 235 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 236 sizeof(struct sockaddr_in)); 237 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 238 nfsv3_diskless.root_time = nfs_diskless.root_time; 239 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 240 MAXHOSTNAMELEN); 241 nfs_diskless_valid = 3; 242 } 243 244 /* 245 * nfs statfs call 246 */ 247 int 248 nfs_statfs(mp, sbp, p) 249 struct mount *mp; 250 register struct statfs *sbp; 251 struct proc *p; 252 { 253 register struct vnode *vp; 254 register struct nfs_statfs *sfp; 255 register caddr_t cp; 256 register u_int32_t *tl; 257 register int32_t t1, t2; 258 caddr_t bpos, dpos, cp2; 259 struct nfsmount *nmp = VFSTONFS(mp); 260 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 261 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 262 struct ucred *cred; 263 struct nfsnode *np; 264 u_quad_t tquad; 265 int bsize; 266 267 #ifndef nolint 268 sfp = (struct nfs_statfs *)0; 269 #endif 270 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 271 if (error) 272 return (error); 273 vp = NFSTOV(np); 274 cred = crget(); 275 cred->cr_ngroups = 1; 276 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 277 (void)nfs_fsinfo(nmp, vp, cred, p); 278 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 279 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 280 nfsm_fhtom(vp, v3); 281 nfsm_request(vp, NFSPROC_FSSTAT, p, cred); 282 if (v3) 283 nfsm_postop_attr(vp, retattr); 284 if (error) { 285 if (mrep != NULL) 286 m_freem(mrep); 287 goto nfsmout; 288 } 289 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 290 sbp->f_flags = nmp->nm_flag; 291 sbp->f_iosize = nfs_iosize(nmp); 292 if (v3) { 293 for (bsize = NFS_FABLKSIZE; ; bsize *= 2) { 294 sbp->f_bsize = bsize; 295 tquad = fxdr_hyper(&sfp->sf_tbytes); 296 if (((quad_t)(tquad / bsize) > LONG_MAX) || 297 ((quad_t)(tquad / bsize) < LONG_MIN)) 298 continue; 299 sbp->f_blocks = tquad / bsize; 300 tquad = fxdr_hyper(&sfp->sf_fbytes); 301 if (((quad_t)(tquad / bsize) > LONG_MAX) || 302 ((quad_t)(tquad / bsize) < LONG_MIN)) 303 continue; 304 sbp->f_bfree = tquad / bsize; 305 tquad = fxdr_hyper(&sfp->sf_abytes); 306 if (((quad_t)(tquad / bsize) > LONG_MAX) || 307 ((quad_t)(tquad / bsize) < LONG_MIN)) 308 continue; 309 sbp->f_bavail = tquad / bsize; 310 sbp->f_files = (fxdr_unsigned(int32_t, 311 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 312 sbp->f_ffree = (fxdr_unsigned(int32_t, 313 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 314 break; 315 } 316 } else { 317 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 318 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 319 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 320 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 321 sbp->f_files = 0; 322 sbp->f_ffree = 0; 323 } 324 if (sbp != &mp->mnt_stat) { 325 sbp->f_type = mp->mnt_vfc->vfc_typenum; 326 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 327 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 328 } 329 nfsm_reqdone; 330 vput(vp); 331 crfree(cred); 332 return (error); 333 } 334 335 /* 336 * nfs version 3 fsinfo rpc call 337 */ 338 int 339 nfs_fsinfo(nmp, vp, cred, p) 340 register struct nfsmount *nmp; 341 register struct vnode *vp; 342 struct ucred *cred; 343 struct proc *p; 344 { 345 register struct nfsv3_fsinfo *fsp; 346 register caddr_t cp; 347 register int32_t t1, t2; 348 register u_int32_t *tl, pref, max; 349 caddr_t bpos, dpos, cp2; 350 int error = 0, retattr; 351 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 352 u_int64_t maxfsize; 353 354 nfsstats.rpccnt[NFSPROC_FSINFO]++; 355 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 356 nfsm_fhtom(vp, 1); 357 nfsm_request(vp, NFSPROC_FSINFO, p, cred); 358 nfsm_postop_attr(vp, retattr); 359 if (!error) { 360 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 361 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 362 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 363 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 364 ~(NFS_FABLKSIZE - 1); 365 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 366 if (max < nmp->nm_wsize && max > 0) { 367 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 368 if (nmp->nm_wsize == 0) 369 nmp->nm_wsize = max; 370 } 371 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 372 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 373 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 374 ~(NFS_FABLKSIZE - 1); 375 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 376 if (max < nmp->nm_rsize && max > 0) { 377 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 378 if (nmp->nm_rsize == 0) 379 nmp->nm_rsize = max; 380 } 381 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 382 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 383 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 384 ~(NFS_DIRBLKSIZ - 1); 385 if (max < nmp->nm_readdirsize && max > 0) { 386 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 387 if (nmp->nm_readdirsize == 0) 388 nmp->nm_readdirsize = max; 389 } 390 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 391 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 392 nmp->nm_maxfilesize = maxfsize; 393 nmp->nm_state |= NFSSTA_GOTFSINFO; 394 } 395 nfsm_reqdone; 396 return (error); 397 } 398 399 /* 400 * Mount a remote root fs via. nfs. This depends on the info in the 401 * nfs_diskless structure that has been filled in properly by some primary 402 * bootstrap. 403 * It goes something like this: 404 * - do enough of "ifconfig" by calling ifioctl() so that the system 405 * can talk to the server 406 * - If nfs_diskless.mygateway is filled in, use that address as 407 * a default gateway. 408 * - build the rootfs mount point and call mountnfs() to do the rest. 409 */ 410 int 411 nfs_mountroot(mp) 412 struct mount *mp; 413 { 414 struct mount *swap_mp; 415 struct nfsv3_diskless *nd = &nfsv3_diskless; 416 struct socket *so; 417 struct vnode *vp; 418 struct proc *p = curproc; /* XXX */ 419 int error, i; 420 u_long l; 421 char buf[128]; 422 423 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 424 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 425 #endif 426 427 /* 428 * XXX time must be non-zero when we init the interface or else 429 * the arp code will wedge... 430 */ 431 while (time_second == 0) 432 tsleep(&time_second, PZERO+8, "arpkludge", 10); 433 434 if (nfs_diskless_valid==1) 435 nfs_convert_diskless(); 436 437 /* 438 * XXX splnet, so networks will receive... 439 */ 440 splnet(); 441 442 #ifdef notyet 443 /* Set up swap credentials. */ 444 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 445 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 446 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 447 NGROUPS) 448 proc0.p_ucred->cr_ngroups = NGROUPS; 449 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 450 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 451 #endif 452 453 /* 454 * Do enough of ifconfig(8) so that the critical net interface can 455 * talk to the server. 456 */ 457 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, p); 458 if (error) 459 panic("nfs_mountroot: socreate(%04x): %d", 460 nd->myif.ifra_addr.sa_family, error); 461 462 #if 0 /* XXX Bad idea */ 463 /* 464 * We might not have been told the right interface, so we pass 465 * over the first ten interfaces of the same kind, until we get 466 * one of them configured. 467 */ 468 469 for (i = strlen(nd->myif.ifra_name) - 1; 470 nd->myif.ifra_name[i] >= '' && 471 nd->myif.ifra_name[i] <= '9'; 472 nd->myif.ifra_name[i] ++) { 473 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 474 if(!error) 475 break; 476 } 477 #endif 478 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p); 479 if (error) 480 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 481 soclose(so); 482 483 /* 484 * If the gateway field is filled in, set it as the default route. 485 */ 486 if (nd->mygateway.sin_len != 0) { 487 struct sockaddr_in mask, sin; 488 489 bzero((caddr_t)&mask, sizeof(mask)); 490 sin = mask; 491 sin.sin_family = AF_INET; 492 sin.sin_len = sizeof(sin); 493 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 494 (struct sockaddr *)&nd->mygateway, 495 (struct sockaddr *)&mask, 496 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 497 if (error) 498 panic("nfs_mountroot: RTM_ADD: %d", error); 499 } 500 501 /* 502 * Create the rootfs mount point. 503 */ 504 nd->root_args.fh = nd->root_fh; 505 nd->root_args.fhsize = nd->root_fhsize; 506 l = ntohl(nd->root_saddr.sin_addr.s_addr); 507 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 508 (l >> 24) & 0xff, (l >> 16) & 0xff, 509 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 510 printf("NFS ROOT: %s\n",buf); 511 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 512 &nd->root_saddr, &nd->root_args, p, &vp, &mp)) != 0) { 513 if (swap_mp) { 514 mp->mnt_vfc->vfc_refcount--; 515 free(swap_mp, M_MOUNT); 516 } 517 return (error); 518 } 519 520 swap_mp = NULL; 521 if (nd->swap_nblks) { 522 523 /* Convert to DEV_BSIZE instead of Kilobyte */ 524 nd->swap_nblks *= 2; 525 526 /* 527 * Create a fake mount point just for the swap vnode so that the 528 * swap file can be on a different server from the rootfs. 529 */ 530 nd->swap_args.fh = nd->swap_fh; 531 nd->swap_args.fhsize = nd->swap_fhsize; 532 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 533 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 534 (l >> 24) & 0xff, (l >> 16) & 0xff, 535 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 536 printf("NFS SWAP: %s\n",buf); 537 if ((error = nfs_mountdiskless(buf, "/swap", 0, 538 &nd->swap_saddr, &nd->swap_args, p, &vp, &swap_mp)) != 0) 539 return (error); 540 vfs_unbusy(swap_mp, p); 541 542 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 543 nd->swap_nblks * DEV_BSIZE ; 544 545 /* 546 * Since the swap file is not the root dir of a file system, 547 * hack it to a regular file. 548 */ 549 vp->v_type = VREG; 550 vp->v_flag = 0; 551 VREF(vp); 552 swaponvp(p, vp, NODEV, nd->swap_nblks); 553 } 554 555 mp->mnt_flag |= MNT_ROOTFS; 556 mp->mnt_vnodecovered = NULLVP; 557 rootvp = vp; 558 vfs_unbusy(mp, p); 559 560 /* 561 * This is not really an nfs issue, but it is much easier to 562 * set hostname here and then let the "/etc/rc.xxx" files 563 * mount the right /var based upon its preset value. 564 */ 565 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 566 hostname[MAXHOSTNAMELEN - 1] = '\0'; 567 for (i = 0; i < MAXHOSTNAMELEN; i++) 568 if (hostname[i] == '\0') 569 break; 570 inittodr(ntohl(nd->root_time)); 571 return (0); 572 } 573 574 /* 575 * Internal version of mount system call for diskless setup. 576 */ 577 static int 578 nfs_mountdiskless(path, which, mountflag, sin, args, p, vpp, mpp) 579 char *path; 580 char *which; 581 int mountflag; 582 struct sockaddr_in *sin; 583 struct nfs_args *args; 584 struct proc *p; 585 struct vnode **vpp; 586 struct mount **mpp; 587 { 588 struct mount *mp; 589 struct sockaddr *nam; 590 int error; 591 int didalloc = 0; 592 593 mp = *mpp; 594 595 if (mp == NULL) { 596 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 597 printf("nfs_mountroot: NFS not configured"); 598 return (error); 599 } 600 didalloc = 1; 601 } 602 603 mp->mnt_kern_flag = 0; 604 mp->mnt_flag = mountflag; 605 nam = dup_sockaddr((struct sockaddr *)sin, 1); 606 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 607 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 608 mp->mnt_vfc->vfc_refcount--; 609 vfs_unbusy(mp, p); 610 if (didalloc) 611 free(mp, M_MOUNT); 612 FREE(nam, M_SONAME); 613 return (error); 614 } 615 (void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0); 616 *mpp = mp; 617 return (0); 618 } 619 620 static void 621 nfs_decode_args(nmp, argp) 622 struct nfsmount *nmp; 623 struct nfs_args *argp; 624 { 625 int s; 626 int adjsock; 627 int maxio; 628 629 s = splnet(); 630 /* 631 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 632 * no sense in that context. 633 */ 634 if (argp->sotype == SOCK_STREAM) 635 nmp->nm_flag &= ~NFSMNT_NOCONN; 636 637 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 638 if ((argp->flags & NFSMNT_NFSV3) == 0) 639 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 640 641 /* Re-bind if rsrvd port requested and wasn't on one */ 642 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 643 && (argp->flags & NFSMNT_RESVPORT); 644 /* Also re-bind if we're switching to/from a connected UDP socket */ 645 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 646 (argp->flags & NFSMNT_NOCONN)); 647 648 /* Update flags atomically. Don't change the lock bits. */ 649 nmp->nm_flag = argp->flags | nmp->nm_flag; 650 splx(s); 651 652 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 653 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 654 if (nmp->nm_timeo < NFS_MINTIMEO) 655 nmp->nm_timeo = NFS_MINTIMEO; 656 else if (nmp->nm_timeo > NFS_MAXTIMEO) 657 nmp->nm_timeo = NFS_MAXTIMEO; 658 } 659 660 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 661 nmp->nm_retry = argp->retrans; 662 if (nmp->nm_retry > NFS_MAXREXMIT) 663 nmp->nm_retry = NFS_MAXREXMIT; 664 } 665 666 if (argp->flags & NFSMNT_NFSV3) { 667 if (argp->sotype == SOCK_DGRAM) 668 maxio = NFS_MAXDGRAMDATA; 669 else 670 maxio = NFS_MAXDATA; 671 } else 672 maxio = NFS_V2MAXDATA; 673 674 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 675 nmp->nm_wsize = argp->wsize; 676 /* Round down to multiple of blocksize */ 677 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 678 if (nmp->nm_wsize <= 0) 679 nmp->nm_wsize = NFS_FABLKSIZE; 680 } 681 if (nmp->nm_wsize > maxio) 682 nmp->nm_wsize = maxio; 683 if (nmp->nm_wsize > MAXBSIZE) 684 nmp->nm_wsize = MAXBSIZE; 685 686 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 687 nmp->nm_rsize = argp->rsize; 688 /* Round down to multiple of blocksize */ 689 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 690 if (nmp->nm_rsize <= 0) 691 nmp->nm_rsize = NFS_FABLKSIZE; 692 } 693 if (nmp->nm_rsize > maxio) 694 nmp->nm_rsize = maxio; 695 if (nmp->nm_rsize > MAXBSIZE) 696 nmp->nm_rsize = MAXBSIZE; 697 698 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 699 nmp->nm_readdirsize = argp->readdirsize; 700 } 701 if (nmp->nm_readdirsize > maxio) 702 nmp->nm_readdirsize = maxio; 703 if (nmp->nm_readdirsize > nmp->nm_rsize) 704 nmp->nm_readdirsize = nmp->nm_rsize; 705 706 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 707 nmp->nm_acregmin = argp->acregmin; 708 else 709 nmp->nm_acregmin = NFS_MINATTRTIMO; 710 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 711 nmp->nm_acregmax = argp->acregmax; 712 else 713 nmp->nm_acregmax = NFS_MAXATTRTIMO; 714 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 715 nmp->nm_acdirmin = argp->acdirmin; 716 else 717 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 718 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 719 nmp->nm_acdirmax = argp->acdirmax; 720 else 721 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 722 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 723 nmp->nm_acdirmin = nmp->nm_acdirmax; 724 if (nmp->nm_acregmin > nmp->nm_acregmax) 725 nmp->nm_acregmin = nmp->nm_acregmax; 726 727 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 728 if (argp->maxgrouplist <= NFS_MAXGRPS) 729 nmp->nm_numgrps = argp->maxgrouplist; 730 else 731 nmp->nm_numgrps = NFS_MAXGRPS; 732 } 733 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 734 if (argp->readahead <= NFS_MAXRAHEAD) 735 nmp->nm_readahead = argp->readahead; 736 else 737 nmp->nm_readahead = NFS_MAXRAHEAD; 738 } 739 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2) { 740 if (argp->leaseterm <= NQ_MAXLEASE) 741 nmp->nm_leaseterm = argp->leaseterm; 742 else 743 nmp->nm_leaseterm = NQ_MAXLEASE; 744 } 745 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 746 if (argp->deadthresh <= NQ_NEVERDEAD) 747 nmp->nm_deadthresh = argp->deadthresh; 748 else 749 nmp->nm_deadthresh = NQ_NEVERDEAD; 750 } 751 752 adjsock |= ((nmp->nm_sotype != argp->sotype) || 753 (nmp->nm_soproto != argp->proto)); 754 nmp->nm_sotype = argp->sotype; 755 nmp->nm_soproto = argp->proto; 756 757 if (nmp->nm_so && adjsock) { 758 nfs_safedisconnect(nmp); 759 if (nmp->nm_sotype == SOCK_DGRAM) 760 while (nfs_connect(nmp, (struct nfsreq *)0)) { 761 printf("nfs_args: retrying connect\n"); 762 (void) tsleep((caddr_t)&lbolt, 763 PSOCK, "nfscon", 0); 764 } 765 } 766 } 767 768 /* 769 * VFS Operations. 770 * 771 * mount system call 772 * It seems a bit dumb to copyinstr() the host and path here and then 773 * bcopy() them in mountnfs(), but I wanted to detect errors before 774 * doing the sockargs() call because sockargs() allocates an mbuf and 775 * an error after that means that I have to release the mbuf. 776 */ 777 /* ARGSUSED */ 778 static int 779 nfs_mount(mp, path, data, ndp, p) 780 struct mount *mp; 781 char *path; 782 caddr_t data; 783 struct nameidata *ndp; 784 struct proc *p; 785 { 786 int error; 787 struct nfs_args args; 788 struct sockaddr *nam; 789 struct vnode *vp; 790 char pth[MNAMELEN], hst[MNAMELEN]; 791 size_t len; 792 u_char nfh[NFSX_V3FHMAX]; 793 794 if (path == NULL) { 795 nfs_mountroot(mp); 796 return (0); 797 } 798 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 799 if (error) 800 return (error); 801 if (args.version != NFS_ARGSVERSION) { 802 #ifdef COMPAT_PRELITE2 803 /* 804 * If the argument version is unknown, then assume the 805 * caller is a pre-lite2 4.4BSD client and convert its 806 * arguments. 807 */ 808 struct onfs_args oargs; 809 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 810 if (error) 811 return (error); 812 nfs_convert_oargs(&args,&oargs); 813 #else /* !COMPAT_PRELITE2 */ 814 return (EPROGMISMATCH); 815 #endif /* COMPAT_PRELITE2 */ 816 } 817 if (mp->mnt_flag & MNT_UPDATE) { 818 register struct nfsmount *nmp = VFSTONFS(mp); 819 820 if (nmp == NULL) 821 return (EIO); 822 /* 823 * When doing an update, we can't change from or to 824 * v3 and/or nqnfs, or change cookie translation 825 */ 826 args.flags = (args.flags & 827 ~(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)) | 828 (nmp->nm_flag & 829 (NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)); 830 nfs_decode_args(nmp, &args); 831 return (0); 832 } 833 834 /* 835 * Make the nfs_ip_paranoia sysctl serve as the default connection 836 * or no-connection mode for those protocols that support 837 * no-connection mode (the flag will be cleared later for protocols 838 * that do not support no-connection mode). This will allow a client 839 * to receive replies from a different IP then the request was 840 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 841 * not 0. 842 */ 843 if (nfs_ip_paranoia == 0) 844 args.flags |= NFSMNT_NOCONN; 845 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 846 return (EINVAL); 847 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 848 if (error) 849 return (error); 850 error = copyinstr(path, pth, MNAMELEN-1, &len); 851 if (error) 852 return (error); 853 bzero(&pth[len], MNAMELEN - len); 854 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 855 if (error) 856 return (error); 857 bzero(&hst[len], MNAMELEN - len); 858 /* sockargs() call must be after above copyin() calls */ 859 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 860 if (error) 861 return (error); 862 args.fh = nfh; 863 error = mountnfs(&args, mp, nam, pth, hst, &vp); 864 return (error); 865 } 866 867 /* 868 * Common code for mount and mountroot 869 */ 870 static int 871 mountnfs(argp, mp, nam, pth, hst, vpp) 872 register struct nfs_args *argp; 873 register struct mount *mp; 874 struct sockaddr *nam; 875 char *pth, *hst; 876 struct vnode **vpp; 877 { 878 register struct nfsmount *nmp; 879 struct nfsnode *np; 880 int error; 881 struct vattr attrs; 882 883 if (mp->mnt_flag & MNT_UPDATE) { 884 nmp = VFSTONFS(mp); 885 /* update paths, file handles, etc, here XXX */ 886 FREE(nam, M_SONAME); 887 return (0); 888 } else { 889 nmp = zalloc(nfsmount_zone); 890 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 891 TAILQ_INIT(&nmp->nm_uidlruhead); 892 TAILQ_INIT(&nmp->nm_bufq); 893 mp->mnt_data = (qaddr_t)nmp; 894 } 895 vfs_getnewfsid(mp); 896 nmp->nm_mountp = mp; 897 if (argp->flags & NFSMNT_NQNFS) 898 /* 899 * We have to set mnt_maxsymlink to a non-zero value so 900 * that COMPAT_43 routines will know that we are setting 901 * the d_type field in directories (and can zero it for 902 * unsuspecting binaries). 903 */ 904 mp->mnt_maxsymlinklen = 1; 905 906 /* 907 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 908 * high, depending on whether we end up with negative offsets in 909 * the client or server somewhere. 2GB-1 may be safer. 910 * 911 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 912 * that we can handle until we find out otherwise. 913 * XXX Our "safe" limit on the client is what we can store in our 914 * buffer cache using signed(!) block numbers. 915 */ 916 if ((argp->flags & NFSMNT_NFSV3) == 0) 917 nmp->nm_maxfilesize = 0xffffffffLL; 918 else 919 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 920 921 nmp->nm_timeo = NFS_TIMEO; 922 nmp->nm_retry = NFS_RETRANS; 923 nmp->nm_wsize = NFS_WSIZE; 924 nmp->nm_rsize = NFS_RSIZE; 925 nmp->nm_readdirsize = NFS_READDIRSIZE; 926 nmp->nm_numgrps = NFS_MAXGRPS; 927 nmp->nm_readahead = NFS_DEFRAHEAD; 928 nmp->nm_leaseterm = NQ_DEFLEASE; 929 nmp->nm_deadthresh = NQ_DEADTHRESH; 930 CIRCLEQ_INIT(&nmp->nm_timerhead); 931 nmp->nm_inprog = NULLVP; 932 nmp->nm_fhsize = argp->fhsize; 933 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 934 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 935 bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN); 936 nmp->nm_nam = nam; 937 /* Set up the sockets and per-host congestion */ 938 nmp->nm_sotype = argp->sotype; 939 nmp->nm_soproto = argp->proto; 940 941 nfs_decode_args(nmp, argp); 942 943 /* 944 * For Connection based sockets (TCP,...) defer the connect until 945 * the first request, in case the server is not responding. 946 */ 947 if (nmp->nm_sotype == SOCK_DGRAM && 948 (error = nfs_connect(nmp, (struct nfsreq *)0))) 949 goto bad; 950 951 /* 952 * This is silly, but it has to be set so that vinifod() works. 953 * We do not want to do an nfs_statfs() here since we can get 954 * stuck on a dead server and we are holding a lock on the mount 955 * point. 956 */ 957 mp->mnt_stat.f_iosize = nfs_iosize(nmp); 958 /* 959 * A reference count is needed on the nfsnode representing the 960 * remote root. If this object is not persistent, then backward 961 * traversals of the mount point (i.e. "..") will not work if 962 * the nfsnode gets flushed out of the cache. Ufs does not have 963 * this problem, because one can identify root inodes by their 964 * number == ROOTINO (2). 965 */ 966 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 967 if (error) 968 goto bad; 969 *vpp = NFSTOV(np); 970 971 /* 972 * Get file attributes for the mountpoint. This has the side 973 * effect of filling in (*vpp)->v_type with the correct value. 974 */ 975 VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc); 976 977 /* 978 * Lose the lock but keep the ref. 979 */ 980 VOP_UNLOCK(*vpp, 0, curproc); 981 982 return (0); 983 bad: 984 nfs_disconnect(nmp); 985 zfree(nfsmount_zone, nmp); 986 FREE(nam, M_SONAME); 987 return (error); 988 } 989 990 /* 991 * unmount system call 992 */ 993 static int 994 nfs_unmount(mp, mntflags, p) 995 struct mount *mp; 996 int mntflags; 997 struct proc *p; 998 { 999 register struct nfsmount *nmp; 1000 int error, flags = 0; 1001 1002 if (mntflags & MNT_FORCE) 1003 flags |= FORCECLOSE; 1004 nmp = VFSTONFS(mp); 1005 /* 1006 * Goes something like this.. 1007 * - Call vflush() to clear out vnodes for this file system 1008 * - Close the socket 1009 * - Free up the data structures 1010 */ 1011 /* In the forced case, cancel any outstanding requests. */ 1012 if (flags & FORCECLOSE) { 1013 error = nfs_nmcancelreqs(nmp); 1014 if (error) 1015 return (error); 1016 } 1017 /* 1018 * Must handshake with nqnfs_clientd() if it is active. 1019 */ 1020 nmp->nm_state |= NFSSTA_DISMINPROG; 1021 while (nmp->nm_inprog != NULLVP) 1022 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0); 1023 1024 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1025 error = vflush(mp, 1, flags); 1026 if (error) { 1027 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1028 return (error); 1029 } 1030 1031 /* 1032 * We are now committed to the unmount. 1033 * For NQNFS, let the server daemon free the nfsmount structure. 1034 */ 1035 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 1036 nmp->nm_state |= NFSSTA_DISMNT; 1037 1038 nfs_disconnect(nmp); 1039 FREE(nmp->nm_nam, M_SONAME); 1040 1041 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 1042 zfree(nfsmount_zone, nmp); 1043 return (0); 1044 } 1045 1046 /* 1047 * Return root of a filesystem 1048 */ 1049 static int 1050 nfs_root(mp, vpp) 1051 struct mount *mp; 1052 struct vnode **vpp; 1053 { 1054 register struct vnode *vp; 1055 struct nfsmount *nmp; 1056 struct nfsnode *np; 1057 int error; 1058 1059 nmp = VFSTONFS(mp); 1060 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1061 if (error) 1062 return (error); 1063 vp = NFSTOV(np); 1064 if (vp->v_type == VNON) 1065 vp->v_type = VDIR; 1066 vp->v_flag = VROOT; 1067 *vpp = vp; 1068 return (0); 1069 } 1070 1071 extern int syncprt; 1072 1073 /* 1074 * Flush out the buffer cache 1075 */ 1076 /* ARGSUSED */ 1077 static int 1078 nfs_sync(mp, waitfor, cred, p) 1079 struct mount *mp; 1080 int waitfor; 1081 struct ucred *cred; 1082 struct proc *p; 1083 { 1084 register struct vnode *vp; 1085 int error, allerror = 0; 1086 1087 /* 1088 * Force stale buffer cache information to be flushed. 1089 */ 1090 loop: 1091 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 1092 vp != NULL; 1093 vp = TAILQ_NEXT(vp, v_nmntvnodes)) { 1094 /* 1095 * If the vnode that we are about to sync is no longer 1096 * associated with this mount point, start over. 1097 */ 1098 if (vp->v_mount != mp) 1099 goto loop; 1100 if (VOP_ISLOCKED(vp, NULL) || TAILQ_EMPTY(&vp->v_dirtyblkhd) || 1101 waitfor == MNT_LAZY) 1102 continue; 1103 if (vget(vp, LK_EXCLUSIVE, p)) 1104 goto loop; 1105 error = VOP_FSYNC(vp, cred, waitfor, p); 1106 if (error) 1107 allerror = error; 1108 vput(vp); 1109 } 1110 return (allerror); 1111 } 1112
Cache object: e6eaffe861de663595c19ba405fd2dcd
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