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sys/nfsclient/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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD: releng/6.0/sys/nfsclient/nfs_vfsops.c 147280 2005-06-10 23:50:41Z green $"); 37 38 #include "opt_bootp.h" 39 #include "opt_nfsroot.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/bio.h> 45 #include <sys/buf.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/module.h> 50 #include <sys/mount.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/sockio.h> 55 #include <sys/sysctl.h> 56 #include <sys/vnode.h> 57 #include <sys/signalvar.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_extern.h> 61 #include <vm/uma.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 #include <netinet/in.h> 66 67 #include <rpc/rpcclnt.h> 68 69 #include <nfs/rpcv2.h> 70 #include <nfs/nfsproto.h> 71 #include <nfsclient/nfs.h> 72 #include <nfsclient/nfsnode.h> 73 #include <nfsclient/nfsmount.h> 74 #include <nfs/xdr_subs.h> 75 #include <nfsclient/nfsm_subs.h> 76 #include <nfsclient/nfsdiskless.h> 77 78 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 79 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 80 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 81 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 82 MALLOC_DEFINE(M_NFSDIRECTIO, "NFS DirectIO", "NFS Direct IO async write state"); 83 84 uma_zone_t nfsmount_zone; 85 86 struct nfsstats nfsstats; 87 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 88 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 89 &nfsstats, nfsstats, "S,nfsstats"); 90 static int nfs_ip_paranoia = 1; 91 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 92 &nfs_ip_paranoia, 0, ""); 93 #ifdef NFS_DEBUG 94 int nfs_debug; 95 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 96 #endif 97 static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY; 98 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY, 99 downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, ""); 100 /* how long between console messages "nfs server foo not responding" */ 101 static int nfs_tprintf_delay = NFS_TPRINTF_DELAY; 102 SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY, 103 downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, ""); 104 105 static int nfs_iosize(struct nfsmount *nmp); 106 static void nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp); 107 static int mountnfs(struct nfs_args *, struct mount *, 108 struct sockaddr *, char *, struct vnode **, 109 struct ucred *cred); 110 static vfs_mount_t nfs_mount; 111 static vfs_cmount_t nfs_cmount; 112 static vfs_unmount_t nfs_unmount; 113 static vfs_root_t nfs_root; 114 static vfs_statfs_t nfs_statfs; 115 static vfs_sync_t nfs_sync; 116 static vfs_sysctl_t nfs_sysctl; 117 118 /* 119 * nfs vfs operations. 120 */ 121 static struct vfsops nfs_vfsops = { 122 .vfs_init = nfs_init, 123 .vfs_mount = nfs_mount, 124 .vfs_cmount = nfs_cmount, 125 .vfs_root = nfs_root, 126 .vfs_statfs = nfs_statfs, 127 .vfs_sync = nfs_sync, 128 .vfs_uninit = nfs_uninit, 129 .vfs_unmount = nfs_unmount, 130 .vfs_sysctl = nfs_sysctl, 131 }; 132 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 133 134 /* So that loader and kldload(2) can find us, wherever we are.. */ 135 MODULE_VERSION(nfs, 1); 136 137 static struct nfs_rpcops nfs_rpcops = { 138 nfs_readrpc, 139 nfs_writerpc, 140 nfs_writebp, 141 nfs_readlinkrpc, 142 nfs_invaldir, 143 nfs_commit, 144 }; 145 146 /* 147 * This structure must be filled in by a primary bootstrap or bootstrap 148 * server for a diskless/dataless machine. It is initialized below just 149 * to ensure that it is allocated to initialized data (.data not .bss). 150 */ 151 struct nfs_diskless nfs_diskless = { { { 0 } } }; 152 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 153 int nfs_diskless_valid = 0; 154 155 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 156 &nfs_diskless_valid, 0, ""); 157 158 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 159 nfsv3_diskless.root_hostnam, 0, ""); 160 161 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 162 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 163 "%Ssockaddr_in", ""); 164 165 166 void nfsargs_ntoh(struct nfs_args *); 167 static int nfs_mountdiskless(char *, int, 168 struct sockaddr_in *, struct nfs_args *, 169 struct thread *, struct vnode **, struct mount *); 170 static void nfs_convert_diskless(void); 171 static void nfs_convert_oargs(struct nfs_args *args, 172 struct onfs_args *oargs); 173 174 static int 175 nfs_iosize(struct nfsmount *nmp) 176 { 177 int iosize; 178 179 /* 180 * Calculate the size used for io buffers. Use the larger 181 * of the two sizes to minimise nfs requests but make sure 182 * that it is at least one VM page to avoid wasting buffer 183 * space. 184 */ 185 iosize = max(nmp->nm_rsize, nmp->nm_wsize); 186 if (iosize < PAGE_SIZE) iosize = PAGE_SIZE; 187 return iosize; 188 } 189 190 static void 191 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 192 { 193 194 args->version = NFS_ARGSVERSION; 195 args->addr = oargs->addr; 196 args->addrlen = oargs->addrlen; 197 args->sotype = oargs->sotype; 198 args->proto = oargs->proto; 199 args->fh = oargs->fh; 200 args->fhsize = oargs->fhsize; 201 args->flags = oargs->flags; 202 args->wsize = oargs->wsize; 203 args->rsize = oargs->rsize; 204 args->readdirsize = oargs->readdirsize; 205 args->timeo = oargs->timeo; 206 args->retrans = oargs->retrans; 207 args->maxgrouplist = oargs->maxgrouplist; 208 args->readahead = oargs->readahead; 209 args->deadthresh = oargs->deadthresh; 210 args->hostname = oargs->hostname; 211 } 212 213 static void 214 nfs_convert_diskless(void) 215 { 216 217 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 218 sizeof(struct ifaliasreq)); 219 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 220 sizeof(struct sockaddr_in)); 221 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 222 nfsv3_diskless.root_fhsize = NFSX_V2FH; 223 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH); 224 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 225 sizeof(struct sockaddr_in)); 226 bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN); 227 nfsv3_diskless.root_time = nfs_diskless.root_time; 228 bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam, 229 MAXHOSTNAMELEN); 230 nfs_diskless_valid = 3; 231 } 232 233 /* 234 * nfs statfs call 235 */ 236 static int 237 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 238 { 239 struct vnode *vp; 240 struct nfs_statfs *sfp; 241 caddr_t bpos, dpos; 242 struct nfsmount *nmp = VFSTONFS(mp); 243 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 244 struct mbuf *mreq, *mrep, *md, *mb; 245 struct nfsnode *np; 246 u_quad_t tquad; 247 248 #ifndef nolint 249 sfp = NULL; 250 #endif 251 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 252 if (error) 253 return (error); 254 vp = NFSTOV(np); 255 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 256 (void)nfs_fsinfo(nmp, vp, td->td_ucred, td); 257 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 258 mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 259 mb = mreq; 260 bpos = mtod(mb, caddr_t); 261 nfsm_fhtom(vp, v3); 262 nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred); 263 if (v3) 264 nfsm_postop_attr(vp, retattr); 265 if (error) { 266 if (mrep != NULL) 267 m_freem(mrep); 268 goto nfsmout; 269 } 270 sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3)); 271 sbp->f_iosize = nfs_iosize(nmp); 272 if (v3) { 273 sbp->f_bsize = NFS_FABLKSIZE; 274 tquad = fxdr_hyper(&sfp->sf_tbytes); 275 sbp->f_blocks = tquad / NFS_FABLKSIZE; 276 tquad = fxdr_hyper(&sfp->sf_fbytes); 277 sbp->f_bfree = tquad / NFS_FABLKSIZE; 278 tquad = fxdr_hyper(&sfp->sf_abytes); 279 sbp->f_bavail = tquad / NFS_FABLKSIZE; 280 sbp->f_files = (fxdr_unsigned(int32_t, 281 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 282 sbp->f_ffree = (fxdr_unsigned(int32_t, 283 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 284 } else { 285 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 286 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 287 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 288 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 289 sbp->f_files = 0; 290 sbp->f_ffree = 0; 291 } 292 m_freem(mrep); 293 nfsmout: 294 vput(vp); 295 return (error); 296 } 297 298 /* 299 * nfs version 3 fsinfo rpc call 300 */ 301 int 302 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred, 303 struct thread *td) 304 { 305 struct nfsv3_fsinfo *fsp; 306 u_int32_t pref, max; 307 caddr_t bpos, dpos; 308 int error = 0, retattr; 309 struct mbuf *mreq, *mrep, *md, *mb; 310 u_int64_t maxfsize; 311 312 nfsstats.rpccnt[NFSPROC_FSINFO]++; 313 mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 314 mb = mreq; 315 bpos = mtod(mb, caddr_t); 316 nfsm_fhtom(vp, 1); 317 nfsm_request(vp, NFSPROC_FSINFO, td, cred); 318 nfsm_postop_attr(vp, retattr); 319 if (!error) { 320 fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO); 321 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 322 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 323 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 324 ~(NFS_FABLKSIZE - 1); 325 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 326 if (max < nmp->nm_wsize && max > 0) { 327 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 328 if (nmp->nm_wsize == 0) 329 nmp->nm_wsize = max; 330 } 331 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 332 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 333 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 334 ~(NFS_FABLKSIZE - 1); 335 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 336 if (max < nmp->nm_rsize && max > 0) { 337 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 338 if (nmp->nm_rsize == 0) 339 nmp->nm_rsize = max; 340 } 341 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 342 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 343 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 344 ~(NFS_DIRBLKSIZ - 1); 345 if (max < nmp->nm_readdirsize && max > 0) { 346 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 347 if (nmp->nm_readdirsize == 0) 348 nmp->nm_readdirsize = max; 349 } 350 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 351 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 352 nmp->nm_maxfilesize = maxfsize; 353 nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp); 354 nmp->nm_state |= NFSSTA_GOTFSINFO; 355 } 356 m_freem(mrep); 357 nfsmout: 358 return (error); 359 } 360 361 /* 362 * Mount a remote root fs via. nfs. This depends on the info in the 363 * nfs_diskless structure that has been filled in properly by some primary 364 * bootstrap. 365 * It goes something like this: 366 * - do enough of "ifconfig" by calling ifioctl() so that the system 367 * can talk to the server 368 * - If nfs_diskless.mygateway is filled in, use that address as 369 * a default gateway. 370 * - build the rootfs mount point and call mountnfs() to do the rest. 371 * 372 * It is assumed to be safe to read, modify, and write the nfsv3_diskless 373 * structure, as well as other global NFS client variables here, as 374 * nfs_mountroot() will be called once in the boot before any other NFS 375 * client activity occurs. 376 */ 377 int 378 nfs_mountroot(struct mount *mp, struct thread *td) 379 { 380 struct nfsv3_diskless *nd = &nfsv3_diskless; 381 struct socket *so; 382 struct vnode *vp; 383 int error, i; 384 u_long l; 385 char buf[128]; 386 387 NET_ASSERT_GIANT(); 388 389 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 390 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 391 #elif defined(NFS_ROOT) 392 nfs_setup_diskless(); 393 #endif 394 395 if (nfs_diskless_valid == 0) 396 return (-1); 397 if (nfs_diskless_valid == 1) 398 nfs_convert_diskless(); 399 400 /* 401 * XXX splnet, so networks will receive... 402 */ 403 splnet(); 404 405 /* 406 * Do enough of ifconfig(8) so that the critical net interface can 407 * talk to the server. 408 */ 409 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, 410 td->td_ucred, td); 411 if (error) 412 panic("nfs_mountroot: socreate(%04x): %d", 413 nd->myif.ifra_addr.sa_family, error); 414 415 #if 0 /* XXX Bad idea */ 416 /* 417 * We might not have been told the right interface, so we pass 418 * over the first ten interfaces of the same kind, until we get 419 * one of them configured. 420 */ 421 422 for (i = strlen(nd->myif.ifra_name) - 1; 423 nd->myif.ifra_name[i] >= '' && 424 nd->myif.ifra_name[i] <= '9'; 425 nd->myif.ifra_name[i] ++) { 426 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 427 if(!error) 428 break; 429 } 430 #endif 431 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 432 if (error) 433 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 434 soclose(so); 435 436 /* 437 * If the gateway field is filled in, set it as the default route. 438 * Note that pxeboot will set a default route of 0 if the route 439 * is not set by the DHCP server. Check also for a value of 0 440 * to avoid panicking inappropriately in that situation. 441 */ 442 if (nd->mygateway.sin_len != 0 && 443 nd->mygateway.sin_addr.s_addr != 0) { 444 struct sockaddr_in mask, sin; 445 446 bzero((caddr_t)&mask, sizeof(mask)); 447 sin = mask; 448 sin.sin_family = AF_INET; 449 sin.sin_len = sizeof(sin); 450 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 451 (struct sockaddr *)&nd->mygateway, 452 (struct sockaddr *)&mask, 453 RTF_UP | RTF_GATEWAY, NULL); 454 if (error) 455 panic("nfs_mountroot: RTM_ADD: %d", error); 456 } 457 458 /* 459 * Create the rootfs mount point. 460 */ 461 nd->root_args.fh = nd->root_fh; 462 nd->root_args.fhsize = nd->root_fhsize; 463 l = ntohl(nd->root_saddr.sin_addr.s_addr); 464 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 465 (l >> 24) & 0xff, (l >> 16) & 0xff, 466 (l >> 8) & 0xff, (l >> 0) & 0xff, nd->root_hostnam); 467 printf("NFS ROOT: %s\n", buf); 468 if ((error = nfs_mountdiskless(buf, MNT_RDONLY, 469 &nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) { 470 return (error); 471 } 472 473 /* 474 * This is not really an nfs issue, but it is much easier to 475 * set hostname here and then let the "/etc/rc.xxx" files 476 * mount the right /var based upon its preset value. 477 */ 478 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 479 hostname[MAXHOSTNAMELEN - 1] = '\0'; 480 for (i = 0; i < MAXHOSTNAMELEN; i++) 481 if (hostname[i] == '\0') 482 break; 483 inittodr(ntohl(nd->root_time)); 484 return (0); 485 } 486 487 /* 488 * Internal version of mount system call for diskless setup. 489 */ 490 static int 491 nfs_mountdiskless(char *path, int mountflag, 492 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 493 struct vnode **vpp, struct mount *mp) 494 { 495 struct sockaddr *nam; 496 int error; 497 498 mp->mnt_kern_flag = 0; 499 mp->mnt_flag = mountflag; 500 nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK); 501 if ((error = mountnfs(args, mp, nam, path, vpp, 502 td->td_ucred)) != 0) { 503 printf("nfs_mountroot: mount %s on /: %d\n", path, error); 504 return (error); 505 } 506 return (0); 507 } 508 509 static void 510 nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp) 511 { 512 int s; 513 int adjsock; 514 int maxio; 515 516 s = splnet(); 517 518 /* 519 * Set read-only flag if requested; otherwise, clear it if this is 520 * an update. If this is not an update, then either the read-only 521 * flag is already clear, or this is a root mount and it was set 522 * intentionally at some previous point. 523 */ 524 if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) 525 mp->mnt_flag |= MNT_RDONLY; 526 else if (mp->mnt_flag & MNT_UPDATE) 527 mp->mnt_flag &= ~MNT_RDONLY; 528 529 /* 530 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 531 * no sense in that context. 532 */ 533 if (argp->sotype == SOCK_STREAM) 534 nmp->nm_flag &= ~NFSMNT_NOCONN; 535 536 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 537 if ((argp->flags & NFSMNT_NFSV3) == 0) 538 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 539 540 /* Re-bind if rsrvd port requested and wasn't on one */ 541 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 542 && (argp->flags & NFSMNT_RESVPORT); 543 /* Also re-bind if we're switching to/from a connected UDP socket */ 544 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 545 (argp->flags & NFSMNT_NOCONN)); 546 547 /* Update flags atomically. Don't change the lock bits. */ 548 nmp->nm_flag = argp->flags | nmp->nm_flag; 549 splx(s); 550 551 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 552 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 553 if (nmp->nm_timeo < NFS_MINTIMEO) 554 nmp->nm_timeo = NFS_MINTIMEO; 555 else if (nmp->nm_timeo > NFS_MAXTIMEO) 556 nmp->nm_timeo = NFS_MAXTIMEO; 557 } 558 559 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 560 nmp->nm_retry = argp->retrans; 561 if (nmp->nm_retry > NFS_MAXREXMIT) 562 nmp->nm_retry = NFS_MAXREXMIT; 563 } 564 565 if (argp->flags & NFSMNT_NFSV3) { 566 if (argp->sotype == SOCK_DGRAM) 567 maxio = NFS_MAXDGRAMDATA; 568 else 569 maxio = NFS_MAXDATA; 570 } else 571 maxio = NFS_V2MAXDATA; 572 573 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 574 nmp->nm_wsize = argp->wsize; 575 /* Round down to multiple of blocksize */ 576 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 577 if (nmp->nm_wsize <= 0) 578 nmp->nm_wsize = NFS_FABLKSIZE; 579 } 580 if (nmp->nm_wsize > maxio) 581 nmp->nm_wsize = maxio; 582 if (nmp->nm_wsize > MAXBSIZE) 583 nmp->nm_wsize = MAXBSIZE; 584 585 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 586 nmp->nm_rsize = argp->rsize; 587 /* Round down to multiple of blocksize */ 588 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 589 if (nmp->nm_rsize <= 0) 590 nmp->nm_rsize = NFS_FABLKSIZE; 591 } 592 if (nmp->nm_rsize > maxio) 593 nmp->nm_rsize = maxio; 594 if (nmp->nm_rsize > MAXBSIZE) 595 nmp->nm_rsize = MAXBSIZE; 596 597 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 598 nmp->nm_readdirsize = argp->readdirsize; 599 } 600 if (nmp->nm_readdirsize > maxio) 601 nmp->nm_readdirsize = maxio; 602 if (nmp->nm_readdirsize > nmp->nm_rsize) 603 nmp->nm_readdirsize = nmp->nm_rsize; 604 605 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 606 nmp->nm_acregmin = argp->acregmin; 607 else 608 nmp->nm_acregmin = NFS_MINATTRTIMO; 609 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 610 nmp->nm_acregmax = argp->acregmax; 611 else 612 nmp->nm_acregmax = NFS_MAXATTRTIMO; 613 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 614 nmp->nm_acdirmin = argp->acdirmin; 615 else 616 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 617 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 618 nmp->nm_acdirmax = argp->acdirmax; 619 else 620 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 621 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 622 nmp->nm_acdirmin = nmp->nm_acdirmax; 623 if (nmp->nm_acregmin > nmp->nm_acregmax) 624 nmp->nm_acregmin = nmp->nm_acregmax; 625 626 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 627 if (argp->maxgrouplist <= NFS_MAXGRPS) 628 nmp->nm_numgrps = argp->maxgrouplist; 629 else 630 nmp->nm_numgrps = NFS_MAXGRPS; 631 } 632 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 633 if (argp->readahead <= NFS_MAXRAHEAD) 634 nmp->nm_readahead = argp->readahead; 635 else 636 nmp->nm_readahead = NFS_MAXRAHEAD; 637 } 638 if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) { 639 if (argp->wcommitsize < nmp->nm_wsize) 640 nmp->nm_wcommitsize = nmp->nm_wsize; 641 else 642 nmp->nm_wcommitsize = argp->wcommitsize; 643 } 644 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) { 645 if (argp->deadthresh <= NFS_MAXDEADTHRESH) 646 nmp->nm_deadthresh = argp->deadthresh; 647 else 648 nmp->nm_deadthresh = NFS_MAXDEADTHRESH; 649 } 650 651 adjsock |= ((nmp->nm_sotype != argp->sotype) || 652 (nmp->nm_soproto != argp->proto)); 653 nmp->nm_sotype = argp->sotype; 654 nmp->nm_soproto = argp->proto; 655 656 if (nmp->nm_so && adjsock) { 657 nfs_safedisconnect(nmp); 658 if (nmp->nm_sotype == SOCK_DGRAM) 659 while (nfs_connect(nmp, NULL)) { 660 printf("nfs_args: retrying connect\n"); 661 (void) tsleep((caddr_t)&lbolt, 662 PSOCK, "nfscon", 0); 663 } 664 } 665 } 666 667 static const char *nfs_opts[] = { "from", "nfs_args", NULL }; 668 669 /* 670 * VFS Operations. 671 * 672 * mount system call 673 * It seems a bit dumb to copyinstr() the host and path here and then 674 * bcopy() them in mountnfs(), but I wanted to detect errors before 675 * doing the sockargs() call because sockargs() allocates an mbuf and 676 * an error after that means that I have to release the mbuf. 677 */ 678 /* ARGSUSED */ 679 static int 680 nfs_mount(struct mount *mp, struct thread *td) 681 { 682 int error; 683 struct nfs_args args; 684 struct sockaddr *nam; 685 struct vnode *vp; 686 char hst[MNAMELEN]; 687 size_t len; 688 u_char nfh[NFSX_V3FHMAX]; 689 690 if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) 691 return (EINVAL); 692 693 if (mp->mnt_flag & MNT_ROOTFS) 694 return (nfs_mountroot(mp, td)); 695 696 error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args); 697 if (error) 698 return (error); 699 700 if (args.version != NFS_ARGSVERSION) { 701 return (EPROGMISMATCH); 702 } 703 if (mp->mnt_flag & MNT_UPDATE) { 704 struct nfsmount *nmp = VFSTONFS(mp); 705 706 if (nmp == NULL) 707 return (EIO); 708 /* 709 * When doing an update, we can't change from or to 710 * v3, switch lockd strategies or change cookie translation 711 */ 712 args.flags = (args.flags & 713 ~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) | 714 (nmp->nm_flag & 715 (NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)); 716 nfs_decode_args(mp, nmp, &args); 717 return (0); 718 } 719 720 /* 721 * Make the nfs_ip_paranoia sysctl serve as the default connection 722 * or no-connection mode for those protocols that support 723 * no-connection mode (the flag will be cleared later for protocols 724 * that do not support no-connection mode). This will allow a client 725 * to receive replies from a different IP then the request was 726 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 727 * not 0. 728 */ 729 if (nfs_ip_paranoia == 0) 730 args.flags |= NFSMNT_NOCONN; 731 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 732 return (EINVAL); 733 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 734 if (error) 735 return (error); 736 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 737 if (error) 738 return (error); 739 bzero(&hst[len], MNAMELEN - len); 740 /* sockargs() call must be after above copyin() calls */ 741 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 742 if (error) 743 return (error); 744 args.fh = nfh; 745 error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred); 746 return (error); 747 } 748 749 750 /* 751 * VFS Operations. 752 * 753 * mount system call 754 * It seems a bit dumb to copyinstr() the host and path here and then 755 * bcopy() them in mountnfs(), but I wanted to detect errors before 756 * doing the sockargs() call because sockargs() allocates an mbuf and 757 * an error after that means that I have to release the mbuf. 758 */ 759 /* ARGSUSED */ 760 static int 761 nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td) 762 { 763 int error; 764 struct nfs_args args; 765 766 error = copyin(data, &args, sizeof (struct nfs_args)); 767 if (error) 768 return (error); 769 770 ma = mount_arg(ma, "nfs_args", &args, sizeof args); 771 772 error = kernel_mount(ma, flags); 773 774 return (error); 775 } 776 777 /* 778 * Common code for mount and mountroot 779 */ 780 static int 781 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 782 char *hst, struct vnode **vpp, struct ucred *cred) 783 { 784 struct nfsmount *nmp; 785 struct nfsnode *np; 786 int error; 787 struct vattr attrs; 788 789 if (mp->mnt_flag & MNT_UPDATE) { 790 nmp = VFSTONFS(mp); 791 /* update paths, file handles, etc, here XXX */ 792 FREE(nam, M_SONAME); 793 return (0); 794 } else { 795 nmp = uma_zalloc(nfsmount_zone, M_WAITOK); 796 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 797 TAILQ_INIT(&nmp->nm_bufq); 798 mp->mnt_data = (qaddr_t)nmp; 799 } 800 vfs_getnewfsid(mp); 801 nmp->nm_mountp = mp; 802 803 /* 804 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 805 * high, depending on whether we end up with negative offsets in 806 * the client or server somewhere. 2GB-1 may be safer. 807 * 808 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 809 * that we can handle until we find out otherwise. 810 * XXX Our "safe" limit on the client is what we can store in our 811 * buffer cache using signed(!) block numbers. 812 */ 813 if ((argp->flags & NFSMNT_NFSV3) == 0) 814 nmp->nm_maxfilesize = 0xffffffffLL; 815 else 816 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 817 818 nmp->nm_timeo = NFS_TIMEO; 819 nmp->nm_retry = NFS_RETRANS; 820 if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) { 821 nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA; 822 } else { 823 nmp->nm_wsize = NFS_WSIZE; 824 nmp->nm_rsize = NFS_RSIZE; 825 } 826 nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000); 827 nmp->nm_readdirsize = NFS_READDIRSIZE; 828 nmp->nm_numgrps = NFS_MAXGRPS; 829 nmp->nm_readahead = NFS_DEFRAHEAD; 830 nmp->nm_deadthresh = NFS_MAXDEADTHRESH; 831 nmp->nm_tprintf_delay = nfs_tprintf_delay; 832 if (nmp->nm_tprintf_delay < 0) 833 nmp->nm_tprintf_delay = 0; 834 nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay; 835 if (nmp->nm_tprintf_initial_delay < 0) 836 nmp->nm_tprintf_initial_delay = 0; 837 nmp->nm_fhsize = argp->fhsize; 838 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 839 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 840 nmp->nm_nam = nam; 841 /* Set up the sockets and per-host congestion */ 842 nmp->nm_sotype = argp->sotype; 843 nmp->nm_soproto = argp->proto; 844 nmp->nm_rpcops = &nfs_rpcops; 845 846 nfs_decode_args(mp, nmp, argp); 847 848 if (nmp->nm_sotype == SOCK_STREAM) 849 mtx_init(&nmp->nm_nfstcpstate.mtx, "NFS/TCP state lock", 850 NULL, MTX_DEF); 851 852 /* 853 * For Connection based sockets (TCP,...) defer the connect until 854 * the first request, in case the server is not responding. 855 */ 856 if (nmp->nm_sotype == SOCK_DGRAM && 857 (error = nfs_connect(nmp, NULL))) 858 goto bad; 859 860 /* 861 * This is silly, but it has to be set so that vinifod() works. 862 * We do not want to do an nfs_statfs() here since we can get 863 * stuck on a dead server and we are holding a lock on the mount 864 * point. 865 */ 866 mp->mnt_stat.f_iosize = nfs_iosize(nmp); 867 /* 868 * A reference count is needed on the nfsnode representing the 869 * remote root. If this object is not persistent, then backward 870 * traversals of the mount point (i.e. "..") will not work if 871 * the nfsnode gets flushed out of the cache. Ufs does not have 872 * this problem, because one can identify root inodes by their 873 * number == ROOTINO (2). 874 */ 875 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 876 if (error) 877 goto bad; 878 *vpp = NFSTOV(np); 879 880 /* 881 * Get file attributes and transfer parameters for the 882 * mountpoint. This has the side effect of filling in 883 * (*vpp)->v_type with the correct value. 884 */ 885 if (argp->flags & NFSMNT_NFSV3) 886 nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread); 887 else 888 VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread); 889 890 /* 891 * Lose the lock but keep the ref. 892 */ 893 VOP_UNLOCK(*vpp, 0, curthread); 894 895 return (0); 896 bad: 897 if (nmp->nm_sotype == SOCK_STREAM) 898 mtx_destroy(&nmp->nm_nfstcpstate.mtx); 899 nfs_disconnect(nmp); 900 uma_zfree(nfsmount_zone, nmp); 901 FREE(nam, M_SONAME); 902 return (error); 903 } 904 905 /* 906 * unmount system call 907 */ 908 static int 909 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 910 { 911 struct nfsmount *nmp; 912 int error, flags = 0; 913 914 if (mntflags & MNT_FORCE) 915 flags |= FORCECLOSE; 916 nmp = VFSTONFS(mp); 917 /* 918 * Goes something like this.. 919 * - Call vflush() to clear out vnodes for this filesystem 920 * - Close the socket 921 * - Free up the data structures 922 */ 923 /* In the forced case, cancel any outstanding requests. */ 924 if (flags & FORCECLOSE) { 925 error = nfs_nmcancelreqs(nmp); 926 if (error) 927 return (error); 928 } 929 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 930 error = vflush(mp, 1, flags, td); 931 if (error) 932 return (error); 933 934 /* 935 * We are now committed to the unmount. 936 */ 937 nfs_disconnect(nmp); 938 FREE(nmp->nm_nam, M_SONAME); 939 940 if (nmp->nm_sotype == SOCK_STREAM) 941 mtx_destroy(&nmp->nm_nfstcpstate.mtx); 942 943 uma_zfree(nfsmount_zone, nmp); 944 return (0); 945 } 946 947 /* 948 * Return root of a filesystem 949 */ 950 static int 951 nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 952 { 953 struct vnode *vp; 954 struct nfsmount *nmp; 955 struct nfsnode *np; 956 int error; 957 958 nmp = VFSTONFS(mp); 959 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 960 if (error) 961 return (error); 962 vp = NFSTOV(np); 963 /* 964 * Get transfer parameters and attributes for root vnode once. 965 */ 966 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 && 967 (nmp->nm_flag & NFSMNT_NFSV3)) { 968 nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread); 969 } 970 if (vp->v_type == VNON) 971 vp->v_type = VDIR; 972 vp->v_vflag |= VV_ROOT; 973 *vpp = vp; 974 return (0); 975 } 976 977 /* 978 * Flush out the buffer cache 979 */ 980 /* ARGSUSED */ 981 static int 982 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 983 { 984 struct vnode *vp, *nvp; 985 int error, allerror = 0; 986 987 /* 988 * Force stale buffer cache information to be flushed. 989 */ 990 MNT_ILOCK(mp); 991 loop: 992 MNT_VNODE_FOREACH(vp, mp, nvp) { 993 VI_LOCK(vp); 994 MNT_IUNLOCK(mp); 995 if (VOP_ISLOCKED(vp, NULL) || 996 vp->v_bufobj.bo_dirty.bv_cnt == 0 || 997 waitfor == MNT_LAZY) { 998 VI_UNLOCK(vp); 999 MNT_ILOCK(mp); 1000 continue; 1001 } 1002 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) { 1003 MNT_ILOCK(mp); 1004 goto loop; 1005 } 1006 error = VOP_FSYNC(vp, waitfor, td); 1007 if (error) 1008 allerror = error; 1009 VOP_UNLOCK(vp, 0, td); 1010 vrele(vp); 1011 1012 MNT_ILOCK(mp); 1013 } 1014 MNT_IUNLOCK(mp); 1015 return (allerror); 1016 } 1017 1018 static int 1019 nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req) 1020 { 1021 struct nfsmount *nmp = VFSTONFS(mp); 1022 struct vfsquery vq; 1023 int error; 1024 1025 bzero(&vq, sizeof(vq)); 1026 switch (op) { 1027 #if 0 1028 case VFS_CTL_NOLOCKS: 1029 val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0; 1030 if (req->oldptr != NULL) { 1031 error = SYSCTL_OUT(req, &val, sizeof(val)); 1032 if (error) 1033 return (error); 1034 } 1035 if (req->newptr != NULL) { 1036 error = SYSCTL_IN(req, &val, sizeof(val)); 1037 if (error) 1038 return (error); 1039 if (val) 1040 nmp->nm_flag |= NFSMNT_NOLOCKS; 1041 else 1042 nmp->nm_flag &= ~NFSMNT_NOLOCKS; 1043 } 1044 break; 1045 #endif 1046 case VFS_CTL_QUERY: 1047 if (nmp->nm_state & NFSSTA_TIMEO) 1048 vq.vq_flags |= VQ_NOTRESP; 1049 #if 0 1050 if (!(nmp->nm_flag & NFSMNT_NOLOCKS) && 1051 (nmp->nm_state & NFSSTA_LOCKTIMEO)) 1052 vq.vq_flags |= VQ_NOTRESPLOCK; 1053 #endif 1054 error = SYSCTL_OUT(req, &vq, sizeof(vq)); 1055 break; 1056 case VFS_CTL_TIMEO: 1057 if (req->oldptr != NULL) { 1058 error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay, 1059 sizeof(nmp->nm_tprintf_initial_delay)); 1060 if (error) 1061 return (error); 1062 } 1063 if (req->newptr != NULL) { 1064 error = vfs_suser(mp, req->td); 1065 if (error) 1066 return (error); 1067 error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay, 1068 sizeof(nmp->nm_tprintf_initial_delay)); 1069 if (error) 1070 return (error); 1071 if (nmp->nm_tprintf_initial_delay < 0) 1072 nmp->nm_tprintf_initial_delay = 0; 1073 } 1074 break; 1075 default: 1076 return (ENOTSUP); 1077 } 1078 return (0); 1079 }
Cache object: d3fbe592427ace3eb8fa00b241d83c00
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