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: src/sys/nfs/nfs_vfsops.c,v 1.91.2.7 2003/01/27 20:04:08 dillon Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_vfsops.c,v 1.44 2006/07/18 22:22:15 dillon Exp $ 39 */ 40 41 #include "opt_bootp.h" 42 #include "opt_nfsroot.h" 43 44 #include <sys/param.h> 45 #include <sys/sockio.h> 46 #include <sys/proc.h> 47 #include <sys/vnode.h> 48 #include <sys/fcntl.h> 49 #include <sys/kernel.h> 50 #include <sys/sysctl.h> 51 #include <sys/malloc.h> 52 #include <sys/mount.h> 53 #include <sys/mbuf.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/systm.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_extern.h> 60 #include <vm/vm_zone.h> 61 62 #include <net/if.h> 63 #include <net/route.h> 64 #include <netinet/in.h> 65 66 #include <sys/thread2.h> 67 68 #include "rpcv2.h" 69 #include "nfsproto.h" 70 #include "nfs.h" 71 #include "nfsmount.h" 72 #include "nfsnode.h" 73 #include "xdr_subs.h" 74 #include "nfsm_subs.h" 75 #include "nfsdiskless.h" 76 #include "nfsmountrpc.h" 77 78 extern int nfs_mountroot(struct mount *mp); 79 extern void bootpc_init(void); 80 81 extern int nfs_ticks; 82 extern struct vop_ops nfsv2_vnode_vops; 83 extern struct vop_ops nfsv2_fifo_vops; 84 extern struct vop_ops nfsv2_spec_vops; 85 86 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 87 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 88 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 89 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 90 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 91 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 92 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 93 94 vm_zone_t nfsmount_zone; 95 96 struct nfsstats nfsstats; 97 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 98 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 99 &nfsstats, nfsstats, ""); 100 static int nfs_ip_paranoia = 1; 101 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 102 &nfs_ip_paranoia, 0, ""); 103 #ifdef NFS_DEBUG 104 int nfs_debug; 105 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 106 #endif 107 108 /* 109 * Tunable to determine the Read/Write unit size. Maximum value 110 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 111 */ 112 static int nfs_io_size = NFS_MAXDATA; 113 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 114 &nfs_io_size, 0, "NFS optimal I/O unit size"); 115 116 static void nfs_decode_args (struct nfsmount *nmp, 117 struct nfs_args *argp); 118 static int mountnfs (struct nfs_args *,struct mount *, 119 struct sockaddr *,char *,char *,struct vnode **); 120 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 121 struct ucred *cred); 122 static int nfs_unmount ( struct mount *mp, int mntflags); 123 static int nfs_root ( struct mount *mp, struct vnode **vpp); 124 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 125 struct ucred *cred); 126 static int nfs_sync ( struct mount *mp, int waitfor); 127 128 /* 129 * nfs vfs operations. 130 */ 131 static struct vfsops nfs_vfsops = { 132 .vfs_mount = nfs_mount, 133 .vfs_unmount = nfs_unmount, 134 .vfs_root = nfs_root, 135 .vfs_statfs = nfs_statfs, 136 .vfs_sync = nfs_sync, 137 .vfs_init = nfs_init, 138 .vfs_uninit = nfs_uninit 139 }; 140 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 141 142 /* 143 * This structure must be filled in by a primary bootstrap or bootstrap 144 * server for a diskless/dataless machine. It is initialized below just 145 * to ensure that it is allocated to initialized data (.data not .bss). 146 */ 147 struct nfs_diskless nfs_diskless = { { { 0 } } }; 148 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 149 int nfs_diskless_valid = 0; 150 151 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 152 &nfs_diskless_valid, 0, ""); 153 154 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 155 nfsv3_diskless.root_hostnam, 0, ""); 156 157 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 158 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 159 "%Ssockaddr_in", ""); 160 161 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 162 nfsv3_diskless.swap_hostnam, 0, ""); 163 164 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 165 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 166 "%Ssockaddr_in",""); 167 168 169 void nfsargs_ntoh (struct nfs_args *); 170 static int nfs_mountdiskless (char *, char *, int, 171 struct sockaddr_in *, struct nfs_args *, 172 struct thread *, struct vnode **, 173 struct mount **); 174 static void nfs_convert_diskless (void); 175 static void nfs_convert_oargs (struct nfs_args *args, 176 struct onfs_args *oargs); 177 178 /* 179 * Calculate the buffer I/O block size to use. The maximum V2 block size 180 * is typically 8K, the maximum datagram size is typically 16K, and the 181 * maximum V3 block size is typically 32K. The buffer cache tends to work 182 * best with 16K blocks but we allow 32K for TCP connections. 183 * 184 * We force the block size to be at least a page for buffer cache efficiency. 185 */ 186 static 187 int 188 nfs_iosize(int v3, int sotype) 189 { 190 int iosize; 191 int iomax; 192 193 if (v3) { 194 if (sotype == SOCK_STREAM) 195 iomax = NFS_MAXDATA; 196 else 197 iomax = NFS_MAXDGRAMDATA; 198 } else { 199 iomax = NFS_V2MAXDATA; 200 } 201 if ((iosize = nfs_io_size) > iomax) 202 iosize = iomax; 203 if (iosize < PAGE_SIZE) 204 iosize = PAGE_SIZE; 205 206 /* 207 * This is an aweful hack but until the buffer cache is rewritten 208 * we need it. The problem is that when you combine write() with 209 * mmap() the vm_page->valid bits can become weird looking 210 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 211 * at the file EOF. To solve the problem the BIO system needs to 212 * be guarenteed that the NFS iosize for regular files will be a 213 * multiple of PAGE_SIZE so it can invalidate the whole page 214 * rather then just the piece of it owned by the buffer when 215 * NFS does vinvalbuf() calls. 216 */ 217 if (iosize & PAGE_MASK) 218 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 219 return iosize; 220 } 221 222 static void 223 nfs_convert_oargs(args, oargs) 224 struct nfs_args *args; 225 struct onfs_args *oargs; 226 { 227 args->version = NFS_ARGSVERSION; 228 args->addr = oargs->addr; 229 args->addrlen = oargs->addrlen; 230 args->sotype = oargs->sotype; 231 args->proto = oargs->proto; 232 args->fh = oargs->fh; 233 args->fhsize = oargs->fhsize; 234 args->flags = oargs->flags; 235 args->wsize = oargs->wsize; 236 args->rsize = oargs->rsize; 237 args->readdirsize = oargs->readdirsize; 238 args->timeo = oargs->timeo; 239 args->retrans = oargs->retrans; 240 args->maxgrouplist = oargs->maxgrouplist; 241 args->readahead = oargs->readahead; 242 args->deadthresh = oargs->deadthresh; 243 args->hostname = oargs->hostname; 244 } 245 246 static void 247 nfs_convert_diskless() 248 { 249 int i; 250 251 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 252 sizeof(struct ifaliasreq)); 253 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 254 sizeof(struct sockaddr_in)); 255 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 256 257 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 258 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 259 for (i = NFSX_V2FH - 1; i >= 0; --i) { 260 if (nfs_diskless.swap_fh[i]) 261 break; 262 } 263 if (i < 0) 264 nfsv3_diskless.swap_fhsize = 0; 265 266 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 267 sizeof(struct sockaddr_in)); 268 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 269 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 270 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 271 sizeof(struct ucred)); 272 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 273 274 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 275 nfsv3_diskless.root_fhsize = NFSX_V2FH; 276 for (i = NFSX_V2FH - 1; i >= 0; --i) { 277 if (nfs_diskless.root_fh[i]) 278 break; 279 } 280 if (i < 0) 281 nfsv3_diskless.root_fhsize = 0; 282 283 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 284 sizeof(struct sockaddr_in)); 285 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 286 nfsv3_diskless.root_time = nfs_diskless.root_time; 287 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 288 MAXHOSTNAMELEN); 289 nfs_diskless_valid = 3; 290 } 291 292 /* 293 * nfs statfs call 294 */ 295 int 296 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 297 { 298 struct vnode *vp; 299 struct nfs_statfs *sfp; 300 caddr_t cp; 301 u_int32_t *tl; 302 int32_t t1, t2; 303 caddr_t bpos, dpos, cp2; 304 struct nfsmount *nmp = VFSTONFS(mp); 305 thread_t td = curthread; 306 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 307 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 308 struct nfsnode *np; 309 u_quad_t tquad; 310 311 #ifndef nolint 312 sfp = (struct nfs_statfs *)0; 313 #endif 314 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 315 if (error) 316 return (error); 317 vp = NFSTOV(np); 318 /* ignore the passed cred */ 319 cred = crget(); 320 cred->cr_ngroups = 1; 321 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 322 (void)nfs_fsinfo(nmp, vp, td); 323 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 324 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 325 nfsm_fhtom(vp, v3); 326 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 327 if (v3) 328 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 329 if (error) { 330 if (mrep != NULL) 331 m_freem(mrep); 332 goto nfsmout; 333 } 334 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 335 sbp->f_flags = nmp->nm_flag; 336 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 337 338 if (v3) { 339 sbp->f_bsize = NFS_FABLKSIZE; 340 tquad = fxdr_hyper(&sfp->sf_tbytes); 341 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 342 tquad = fxdr_hyper(&sfp->sf_fbytes); 343 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 344 tquad = fxdr_hyper(&sfp->sf_abytes); 345 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 346 sbp->f_files = (fxdr_unsigned(int32_t, 347 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 348 sbp->f_ffree = (fxdr_unsigned(int32_t, 349 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 350 } else { 351 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 352 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 353 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 354 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 355 sbp->f_files = 0; 356 sbp->f_ffree = 0; 357 } 358 if (sbp != &mp->mnt_stat) { 359 sbp->f_type = mp->mnt_vfc->vfc_typenum; 360 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 361 } 362 m_freem(mrep); 363 nfsmout: 364 vput(vp); 365 crfree(cred); 366 return (error); 367 } 368 369 /* 370 * nfs version 3 fsinfo rpc call 371 */ 372 int 373 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 374 { 375 struct nfsv3_fsinfo *fsp; 376 caddr_t cp; 377 int32_t t1, t2; 378 u_int32_t *tl, pref, max; 379 caddr_t bpos, dpos, cp2; 380 int error = 0, retattr; 381 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 382 u_int64_t maxfsize; 383 384 nfsstats.rpccnt[NFSPROC_FSINFO]++; 385 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 386 nfsm_fhtom(vp, 1); 387 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 388 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 389 if (!error) { 390 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 391 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 392 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 393 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 394 ~(NFS_FABLKSIZE - 1); 395 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 396 if (max < nmp->nm_wsize && max > 0) { 397 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 398 if (nmp->nm_wsize == 0) 399 nmp->nm_wsize = max; 400 } 401 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 402 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 403 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 404 ~(NFS_FABLKSIZE - 1); 405 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 406 if (max < nmp->nm_rsize && max > 0) { 407 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 408 if (nmp->nm_rsize == 0) 409 nmp->nm_rsize = max; 410 } 411 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 412 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 413 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 414 ~(NFS_DIRBLKSIZ - 1); 415 if (max < nmp->nm_readdirsize && max > 0) { 416 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 417 if (nmp->nm_readdirsize == 0) 418 nmp->nm_readdirsize = max; 419 } 420 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 421 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 422 nmp->nm_maxfilesize = maxfsize; 423 nmp->nm_state |= NFSSTA_GOTFSINFO; 424 } 425 m_freem(mrep); 426 nfsmout: 427 return (error); 428 } 429 430 /* 431 * Mount a remote root fs via. nfs. This depends on the info in the 432 * nfs_diskless structure that has been filled in properly by some primary 433 * bootstrap. 434 * It goes something like this: 435 * - do enough of "ifconfig" by calling ifioctl() so that the system 436 * can talk to the server 437 * - If nfs_diskless.mygateway is filled in, use that address as 438 * a default gateway. 439 * - build the rootfs mount point and call mountnfs() to do the rest. 440 */ 441 int 442 nfs_mountroot(struct mount *mp) 443 { 444 struct mount *swap_mp; 445 struct nfsv3_diskless *nd = &nfsv3_diskless; 446 struct socket *so; 447 struct vnode *vp; 448 struct thread *td = curthread; /* XXX */ 449 int error, i; 450 u_long l; 451 char buf[128]; 452 453 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 454 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 455 #endif 456 457 /* 458 * XXX time must be non-zero when we init the interface or else 459 * the arp code will wedge... 460 */ 461 while (mycpu->gd_time_seconds == 0) 462 tsleep(mycpu, 0, "arpkludge", 10); 463 464 /* 465 * The boot code may have passed us a diskless structure. 466 */ 467 if (nfs_diskless_valid == 1) 468 nfs_convert_diskless(); 469 470 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 471 printf("nfs_mountroot: interface %s ip %s", 472 nd->myif.ifra_name, 473 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 474 printf(" bcast %s", 475 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 476 printf(" mask %s\n", 477 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 478 #undef SINP 479 480 /* 481 * XXX splnet, so networks will receive... 482 */ 483 crit_enter(); 484 485 /* 486 * BOOTP does not necessarily have to be compiled into the kernel 487 * for an NFS root to work. If we inherited the network 488 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 489 * out our interface for us and all we need to do is ifconfig the 490 * interface. We only do this if the interface has not already been 491 * ifconfig'd by e.g. BOOTP. 492 */ 493 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 494 if (error) { 495 panic("nfs_mountroot: socreate(%04x): %d", 496 nd->myif.ifra_addr.sa_family, error); 497 } 498 499 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 500 if (error) 501 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 502 503 soclose(so, FNONBLOCK); 504 505 /* 506 * If the gateway field is filled in, set it as the default route. 507 */ 508 if (nd->mygateway.sin_len != 0) { 509 struct sockaddr_in mask, sin; 510 511 bzero((caddr_t)&mask, sizeof(mask)); 512 sin = mask; 513 sin.sin_family = AF_INET; 514 sin.sin_len = sizeof(sin); 515 printf("nfs_mountroot: gateway %s\n", 516 inet_ntoa(nd->mygateway.sin_addr)); 517 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 518 (struct sockaddr *)&nd->mygateway, 519 (struct sockaddr *)&mask, 520 RTF_UP | RTF_GATEWAY); 521 if (error) 522 printf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 523 } 524 525 /* 526 * Create the rootfs mount point. 527 */ 528 nd->root_args.fh = nd->root_fh; 529 nd->root_args.fhsize = nd->root_fhsize; 530 l = ntohl(nd->root_saddr.sin_addr.s_addr); 531 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 532 (l >> 24) & 0xff, (l >> 16) & 0xff, 533 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 534 printf("NFS ROOT: %s\n",buf); 535 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 536 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 537 if (swap_mp) { 538 mp->mnt_vfc->vfc_refcount--; 539 free(swap_mp, M_MOUNT); 540 } 541 crit_exit(); 542 return (error); 543 } 544 545 swap_mp = NULL; 546 if (nd->swap_nblks) { 547 548 /* Convert to DEV_BSIZE instead of Kilobyte */ 549 nd->swap_nblks *= 2; 550 551 /* 552 * Create a fake mount point just for the swap vnode so that the 553 * swap file can be on a different server from the rootfs. 554 */ 555 nd->swap_args.fh = nd->swap_fh; 556 nd->swap_args.fhsize = nd->swap_fhsize; 557 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 558 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 559 (l >> 24) & 0xff, (l >> 16) & 0xff, 560 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 561 printf("NFS SWAP: %s\n",buf); 562 if ((error = nfs_mountdiskless(buf, "/swap", 0, 563 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) { 564 crit_exit(); 565 return (error); 566 } 567 vfs_unbusy(swap_mp); 568 569 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 570 nd->swap_nblks * DEV_BSIZE ; 571 572 /* 573 * Since the swap file is not the root dir of a file system, 574 * hack it to a regular file. 575 */ 576 vp->v_flag = 0; 577 vref(vp); 578 nfs_setvtype(vp, VREG); 579 swaponvp(td, vp, nd->swap_nblks); 580 } 581 582 mp->mnt_flag |= MNT_ROOTFS; 583 mp->mnt_vnodecovered = NULLVP; 584 vfs_unbusy(mp); 585 586 /* 587 * This is not really an nfs issue, but it is much easier to 588 * set hostname here and then let the "/etc/rc.xxx" files 589 * mount the right /var based upon its preset value. 590 */ 591 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 592 hostname[MAXHOSTNAMELEN - 1] = '\0'; 593 for (i = 0; i < MAXHOSTNAMELEN; i++) 594 if (hostname[i] == '\0') 595 break; 596 inittodr(ntohl(nd->root_time)); 597 crit_exit(); 598 return (0); 599 } 600 601 /* 602 * Internal version of mount system call for diskless setup. 603 */ 604 static int 605 nfs_mountdiskless(char *path, char *which, int mountflag, 606 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 607 struct vnode **vpp, struct mount **mpp) 608 { 609 struct mount *mp; 610 struct sockaddr *nam; 611 int didalloc = 0; 612 int error; 613 614 mp = *mpp; 615 616 if (mp == NULL) { 617 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 618 printf("nfs_mountroot: NFS not configured"); 619 return (error); 620 } 621 didalloc = 1; 622 } 623 mp->mnt_kern_flag = 0; 624 mp->mnt_flag = mountflag; 625 nam = dup_sockaddr((struct sockaddr *)sin); 626 627 #if defined(BOOTP) || defined(NFS_ROOT) 628 if (args->fhsize == 0) { 629 printf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 630 args->fhsize = 0; 631 error = md_mount(sin, which, args->fh, &args->fhsize, args, td); 632 if (error) { 633 printf("failed.\n"); 634 goto haderror; 635 } 636 printf("success!\n"); 637 } 638 #endif 639 640 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 641 #if defined(BOOTP) || defined(NFS_ROOT) 642 haderror: 643 #endif 644 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 645 mp->mnt_vfc->vfc_refcount--; 646 vfs_unbusy(mp); 647 if (didalloc) 648 free(mp, M_MOUNT); 649 FREE(nam, M_SONAME); 650 return (error); 651 } 652 *mpp = mp; 653 return (0); 654 } 655 656 static void 657 nfs_decode_args(nmp, argp) 658 struct nfsmount *nmp; 659 struct nfs_args *argp; 660 { 661 int adjsock; 662 int maxio; 663 664 crit_enter(); 665 /* 666 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 667 * no sense in that context. 668 */ 669 if (argp->sotype == SOCK_STREAM) 670 nmp->nm_flag &= ~NFSMNT_NOCONN; 671 672 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 673 if ((argp->flags & NFSMNT_NFSV3) == 0) 674 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 675 676 /* Re-bind if rsrvd port requested and wasn't on one */ 677 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 678 && (argp->flags & NFSMNT_RESVPORT); 679 /* Also re-bind if we're switching to/from a connected UDP socket */ 680 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 681 (argp->flags & NFSMNT_NOCONN)); 682 683 /* Update flags atomically. Don't change the lock bits. */ 684 nmp->nm_flag = argp->flags | nmp->nm_flag; 685 crit_exit(); 686 687 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 688 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 689 if (nmp->nm_timeo < NFS_MINTIMEO) 690 nmp->nm_timeo = NFS_MINTIMEO; 691 else if (nmp->nm_timeo > NFS_MAXTIMEO) 692 nmp->nm_timeo = NFS_MAXTIMEO; 693 } 694 695 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 696 nmp->nm_retry = argp->retrans; 697 if (nmp->nm_retry > NFS_MAXREXMIT) 698 nmp->nm_retry = NFS_MAXREXMIT; 699 } 700 701 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 702 703 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 704 nmp->nm_wsize = argp->wsize; 705 /* Round down to multiple of blocksize */ 706 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 707 if (nmp->nm_wsize <= 0) 708 nmp->nm_wsize = NFS_FABLKSIZE; 709 } 710 if (nmp->nm_wsize > maxio) 711 nmp->nm_wsize = maxio; 712 if (nmp->nm_wsize > MAXBSIZE) 713 nmp->nm_wsize = MAXBSIZE; 714 715 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 716 nmp->nm_rsize = argp->rsize; 717 /* Round down to multiple of blocksize */ 718 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 719 if (nmp->nm_rsize <= 0) 720 nmp->nm_rsize = NFS_FABLKSIZE; 721 } 722 if (nmp->nm_rsize > maxio) 723 nmp->nm_rsize = maxio; 724 if (nmp->nm_rsize > MAXBSIZE) 725 nmp->nm_rsize = MAXBSIZE; 726 727 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 728 nmp->nm_readdirsize = argp->readdirsize; 729 } 730 if (nmp->nm_readdirsize > maxio) 731 nmp->nm_readdirsize = maxio; 732 if (nmp->nm_readdirsize > nmp->nm_rsize) 733 nmp->nm_readdirsize = nmp->nm_rsize; 734 735 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 736 nmp->nm_acregmin = argp->acregmin; 737 else 738 nmp->nm_acregmin = NFS_MINATTRTIMO; 739 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 740 nmp->nm_acregmax = argp->acregmax; 741 else 742 nmp->nm_acregmax = NFS_MAXATTRTIMO; 743 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 744 nmp->nm_acdirmin = argp->acdirmin; 745 else 746 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 747 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 748 nmp->nm_acdirmax = argp->acdirmax; 749 else 750 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 751 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 752 nmp->nm_acdirmin = nmp->nm_acdirmax; 753 if (nmp->nm_acregmin > nmp->nm_acregmax) 754 nmp->nm_acregmin = nmp->nm_acregmax; 755 756 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 757 if (argp->maxgrouplist <= NFS_MAXGRPS) 758 nmp->nm_numgrps = argp->maxgrouplist; 759 else 760 nmp->nm_numgrps = NFS_MAXGRPS; 761 } 762 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 763 if (argp->readahead <= NFS_MAXRAHEAD) 764 nmp->nm_readahead = argp->readahead; 765 else 766 nmp->nm_readahead = NFS_MAXRAHEAD; 767 } 768 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 769 if (argp->deadthresh <= NFS_NEVERDEAD) 770 nmp->nm_deadthresh = argp->deadthresh; 771 else 772 nmp->nm_deadthresh = NFS_NEVERDEAD; 773 } 774 775 adjsock |= ((nmp->nm_sotype != argp->sotype) || 776 (nmp->nm_soproto != argp->proto)); 777 nmp->nm_sotype = argp->sotype; 778 nmp->nm_soproto = argp->proto; 779 780 if (nmp->nm_so && adjsock) { 781 nfs_safedisconnect(nmp); 782 if (nmp->nm_sotype == SOCK_DGRAM) 783 while (nfs_connect(nmp, (struct nfsreq *)0)) { 784 printf("nfs_args: retrying connect\n"); 785 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 786 } 787 } 788 } 789 790 /* 791 * VFS Operations. 792 * 793 * mount system call 794 * It seems a bit dumb to copyinstr() the host and path here and then 795 * bcopy() them in mountnfs(), but I wanted to detect errors before 796 * doing the sockargs() call because sockargs() allocates an mbuf and 797 * an error after that means that I have to release the mbuf. 798 */ 799 /* ARGSUSED */ 800 static int 801 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 802 { 803 int error; 804 struct nfs_args args; 805 struct sockaddr *nam; 806 struct vnode *vp; 807 char pth[MNAMELEN], hst[MNAMELEN]; 808 size_t len; 809 u_char nfh[NFSX_V3FHMAX]; 810 811 if (path == NULL) { 812 nfs_mountroot(mp); 813 return (0); 814 } 815 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 816 if (error) 817 return (error); 818 if (args.version != NFS_ARGSVERSION) { 819 #ifdef COMPAT_PRELITE2 820 /* 821 * If the argument version is unknown, then assume the 822 * caller is a pre-lite2 4.4BSD client and convert its 823 * arguments. 824 */ 825 struct onfs_args oargs; 826 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 827 if (error) 828 return (error); 829 nfs_convert_oargs(&args,&oargs); 830 #else /* !COMPAT_PRELITE2 */ 831 return (EPROGMISMATCH); 832 #endif /* COMPAT_PRELITE2 */ 833 } 834 if (mp->mnt_flag & MNT_UPDATE) { 835 struct nfsmount *nmp = VFSTONFS(mp); 836 837 if (nmp == NULL) 838 return (EIO); 839 /* 840 * When doing an update, we can't change from or to 841 * v3, or change cookie translation 842 */ 843 args.flags = (args.flags & 844 ~(NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)) | 845 (nmp->nm_flag & 846 (NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)); 847 nfs_decode_args(nmp, &args); 848 return (0); 849 } 850 851 /* 852 * Make the nfs_ip_paranoia sysctl serve as the default connection 853 * or no-connection mode for those protocols that support 854 * no-connection mode (the flag will be cleared later for protocols 855 * that do not support no-connection mode). This will allow a client 856 * to receive replies from a different IP then the request was 857 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 858 * not 0. 859 */ 860 if (nfs_ip_paranoia == 0) 861 args.flags |= NFSMNT_NOCONN; 862 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 863 return (EINVAL); 864 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 865 if (error) 866 return (error); 867 error = copyinstr(path, pth, MNAMELEN-1, &len); 868 if (error) 869 return (error); 870 bzero(&pth[len], MNAMELEN - len); 871 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 872 if (error) 873 return (error); 874 bzero(&hst[len], MNAMELEN - len); 875 /* sockargs() call must be after above copyin() calls */ 876 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 877 if (error) 878 return (error); 879 args.fh = nfh; 880 error = mountnfs(&args, mp, nam, pth, hst, &vp); 881 return (error); 882 } 883 884 /* 885 * Common code for mount and mountroot 886 */ 887 static int 888 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 889 char *pth, char *hst, struct vnode **vpp) 890 { 891 struct nfsmount *nmp; 892 struct nfsnode *np; 893 int error; 894 895 if (mp->mnt_flag & MNT_UPDATE) { 896 nmp = VFSTONFS(mp); 897 /* update paths, file handles, etc, here XXX */ 898 FREE(nam, M_SONAME); 899 return (0); 900 } else { 901 nmp = zalloc(nfsmount_zone); 902 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 903 TAILQ_INIT(&nmp->nm_uidlruhead); 904 TAILQ_INIT(&nmp->nm_bioq); 905 mp->mnt_data = (qaddr_t)nmp; 906 } 907 vfs_getnewfsid(mp); 908 nmp->nm_mountp = mp; 909 910 /* 911 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 912 * high, depending on whether we end up with negative offsets in 913 * the client or server somewhere. 2GB-1 may be safer. 914 * 915 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 916 * that we can handle until we find out otherwise. 917 * XXX Our "safe" limit on the client is what we can store in our 918 * buffer cache using signed(!) block numbers. 919 */ 920 if ((argp->flags & NFSMNT_NFSV3) == 0) 921 nmp->nm_maxfilesize = 0xffffffffLL; 922 else 923 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 924 925 nmp->nm_timeo = NFS_TIMEO; 926 nmp->nm_retry = NFS_RETRANS; 927 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 928 nmp->nm_rsize = nmp->nm_wsize; 929 nmp->nm_readdirsize = NFS_READDIRSIZE; 930 nmp->nm_numgrps = NFS_MAXGRPS; 931 nmp->nm_readahead = NFS_DEFRAHEAD; 932 nmp->nm_deadthresh = NFS_DEADTHRESH; 933 nmp->nm_fhsize = argp->fhsize; 934 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 935 bcopy(hst, mp->mnt_stat.f_mntfromname, 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 nmp->nm_cred = crhold(proc0.p_ucred); 941 942 nfs_decode_args(nmp, argp); 943 944 /* 945 * For Connection based sockets (TCP,...) defer the connect until 946 * the first request, in case the server is not responding. 947 */ 948 if (nmp->nm_sotype == SOCK_DGRAM && 949 (error = nfs_connect(nmp, (struct nfsreq *)0))) 950 goto bad; 951 952 /* 953 * This is silly, but it has to be set so that vinifod() works. 954 * We do not want to do an nfs_statfs() here since we can get 955 * stuck on a dead server and we are holding a lock on the mount 956 * point. 957 */ 958 mp->mnt_stat.f_iosize = 959 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 960 961 /* 962 * Install vop_ops for our vnops 963 */ 964 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 965 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 966 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 967 968 /* 969 * A reference count is needed on the nfsnode representing the 970 * remote root. If this object is not persistent, then backward 971 * traversals of the mount point (i.e. "..") will not work if 972 * the nfsnode gets flushed out of the cache. Ufs does not have 973 * this problem, because one can identify root inodes by their 974 * number == ROOTINO (2). 975 */ 976 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 977 if (error) 978 goto bad; 979 *vpp = NFSTOV(np); 980 981 /* 982 * Retrieval of mountpoint attributes is delayed until nfs_rot 983 * or nfs_statfs are first called. This will happen either when 984 * we first traverse the mount point or if somebody does a df(1). 985 * 986 * NFSSTA_GOTFSINFO is used to flag if we have successfully 987 * retrieved mountpoint attributes. In the case of NFSv3 we 988 * also flag static fsinfo. 989 */ 990 if (*vpp != NULL) 991 (*vpp)->v_type = VNON; 992 993 /* 994 * Lose the lock but keep the ref. 995 */ 996 VOP_UNLOCK(*vpp, 0); 997 998 return (0); 999 bad: 1000 nfs_disconnect(nmp); 1001 nfs_free_mount(nmp); 1002 FREE(nam, M_SONAME); 1003 return (error); 1004 } 1005 1006 /* 1007 * unmount system call 1008 */ 1009 static int 1010 nfs_unmount(struct mount *mp, int mntflags) 1011 { 1012 struct nfsmount *nmp; 1013 int error, flags = 0; 1014 1015 if (mntflags & MNT_FORCE) 1016 flags |= FORCECLOSE; 1017 nmp = VFSTONFS(mp); 1018 /* 1019 * Goes something like this.. 1020 * - Call vflush() to clear out vnodes for this file system 1021 * - Close the socket 1022 * - Free up the data structures 1023 */ 1024 /* In the forced case, cancel any outstanding requests. */ 1025 if (flags & FORCECLOSE) { 1026 error = nfs_nmcancelreqs(nmp); 1027 if (error) 1028 return (error); 1029 } 1030 /* 1031 * Must handshake with nfs_clientd() if it is active. XXX 1032 */ 1033 nmp->nm_state |= NFSSTA_DISMINPROG; 1034 1035 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1036 error = vflush(mp, 1, flags); 1037 if (error) { 1038 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1039 return (error); 1040 } 1041 1042 /* 1043 * We are now committed to the unmount. 1044 * For NQNFS, let the server daemon free the nfsmount structure. 1045 */ 1046 if (nmp->nm_flag & NFSMNT_KERB) 1047 nmp->nm_state |= NFSSTA_DISMNT; 1048 1049 nfs_disconnect(nmp); 1050 FREE(nmp->nm_nam, M_SONAME); 1051 1052 if ((nmp->nm_flag & NFSMNT_KERB) == 0) 1053 nfs_free_mount(nmp); 1054 return (0); 1055 } 1056 1057 void 1058 nfs_free_mount(struct nfsmount *nmp) 1059 { 1060 if (nmp->nm_cred) { 1061 crfree(nmp->nm_cred); 1062 nmp->nm_cred = NULL; 1063 } 1064 zfree(nfsmount_zone, nmp); 1065 } 1066 1067 /* 1068 * Return root of a filesystem 1069 */ 1070 static int 1071 nfs_root(mp, vpp) 1072 struct mount *mp; 1073 struct vnode **vpp; 1074 { 1075 struct vnode *vp; 1076 struct nfsmount *nmp; 1077 struct vattr attrs; 1078 struct nfsnode *np; 1079 int error; 1080 1081 nmp = VFSTONFS(mp); 1082 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1083 if (error) 1084 return (error); 1085 vp = NFSTOV(np); 1086 1087 /* 1088 * Get transfer parameters and root vnode attributes 1089 */ 1090 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1091 if (nmp->nm_flag & NFSMNT_NFSV3) { 1092 nfs_fsinfo(nmp, vp, curthread); 1093 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1094 } else { 1095 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1096 nmp->nm_state |= NFSSTA_GOTFSINFO; 1097 1098 } 1099 } 1100 if (vp->v_type == VNON) 1101 nfs_setvtype(vp, VDIR); 1102 vp->v_flag = VROOT; 1103 *vpp = vp; 1104 return (0); 1105 } 1106 1107 extern int syncprt; 1108 1109 struct scaninfo { 1110 int rescan; 1111 int waitfor; 1112 int allerror; 1113 }; 1114 1115 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1116 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1117 1118 /* 1119 * Flush out the buffer cache 1120 */ 1121 /* ARGSUSED */ 1122 static int 1123 nfs_sync(struct mount *mp, int waitfor) 1124 { 1125 struct scaninfo scaninfo; 1126 int error; 1127 1128 scaninfo.rescan = 0; 1129 scaninfo.waitfor = waitfor; 1130 scaninfo.allerror = 0; 1131 1132 /* 1133 * Force stale buffer cache information to be flushed. 1134 */ 1135 error = 0; 1136 while (error == 0 && scaninfo.rescan) { 1137 scaninfo.rescan = 0; 1138 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1139 nfs_sync_scan2, &scaninfo); 1140 } 1141 return(error); 1142 } 1143 1144 static 1145 int 1146 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1147 { 1148 struct scaninfo *info = data; 1149 1150 if (VOP_ISLOCKED(vp, NULL) || RB_EMPTY(&vp->v_rbdirty_tree)) 1151 return(-1); 1152 if (info->waitfor == MNT_LAZY) 1153 return(-1); 1154 return(0); 1155 } 1156 1157 static 1158 int 1159 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1160 { 1161 struct scaninfo *info = data; 1162 int error; 1163 1164 error = VOP_FSYNC(vp, info->waitfor); 1165 if (error) 1166 info->allerror = error; 1167 return(0); 1168 } 1169 1170