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 1.49 2006/12/23 00:41:29 swildner 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 kprintf("nfs_mountroot: interface %s ip %s", 472 nd->myif.ifra_name, 473 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 474 kprintf(" bcast %s", 475 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 476 kprintf(" 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 kprintf("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 kprintf("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 ksnprintf(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 kprintf("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 kfree(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 ksnprintf(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 kprintf("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 vfs_unbusy(mp); 584 585 /* 586 * This is not really an nfs issue, but it is much easier to 587 * set hostname here and then let the "/etc/rc.xxx" files 588 * mount the right /var based upon its preset value. 589 */ 590 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 591 hostname[MAXHOSTNAMELEN - 1] = '\0'; 592 for (i = 0; i < MAXHOSTNAMELEN; i++) 593 if (hostname[i] == '\0') 594 break; 595 inittodr(ntohl(nd->root_time)); 596 crit_exit(); 597 return (0); 598 } 599 600 /* 601 * Internal version of mount system call for diskless setup. 602 */ 603 static int 604 nfs_mountdiskless(char *path, char *which, int mountflag, 605 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 606 struct vnode **vpp, struct mount **mpp) 607 { 608 struct mount *mp; 609 struct sockaddr *nam; 610 int didalloc = 0; 611 int error; 612 613 mp = *mpp; 614 615 if (mp == NULL) { 616 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 617 kprintf("nfs_mountroot: NFS not configured"); 618 return (error); 619 } 620 didalloc = 1; 621 } 622 mp->mnt_kern_flag = 0; 623 mp->mnt_flag = mountflag; 624 nam = dup_sockaddr((struct sockaddr *)sin); 625 626 #if defined(BOOTP) || defined(NFS_ROOT) 627 if (args->fhsize == 0) { 628 kprintf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 629 args->fhsize = 0; 630 error = md_mount(sin, which, args->fh, &args->fhsize, args, td); 631 if (error) { 632 kprintf("failed.\n"); 633 goto haderror; 634 } 635 kprintf("success!\n"); 636 } 637 #endif 638 639 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 640 #if defined(BOOTP) || defined(NFS_ROOT) 641 haderror: 642 #endif 643 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 644 mp->mnt_vfc->vfc_refcount--; 645 vfs_unbusy(mp); 646 if (didalloc) 647 kfree(mp, M_MOUNT); 648 FREE(nam, M_SONAME); 649 return (error); 650 } 651 *mpp = mp; 652 return (0); 653 } 654 655 static void 656 nfs_decode_args(nmp, argp) 657 struct nfsmount *nmp; 658 struct nfs_args *argp; 659 { 660 int adjsock; 661 int maxio; 662 663 crit_enter(); 664 /* 665 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 666 * no sense in that context. 667 */ 668 if (argp->sotype == SOCK_STREAM) 669 nmp->nm_flag &= ~NFSMNT_NOCONN; 670 671 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 672 if ((argp->flags & NFSMNT_NFSV3) == 0) 673 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 674 675 /* Re-bind if rsrvd port requested and wasn't on one */ 676 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 677 && (argp->flags & NFSMNT_RESVPORT); 678 /* Also re-bind if we're switching to/from a connected UDP socket */ 679 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 680 (argp->flags & NFSMNT_NOCONN)); 681 682 /* Update flags atomically. Don't change the lock bits. */ 683 nmp->nm_flag = argp->flags | nmp->nm_flag; 684 crit_exit(); 685 686 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 687 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 688 if (nmp->nm_timeo < NFS_MINTIMEO) 689 nmp->nm_timeo = NFS_MINTIMEO; 690 else if (nmp->nm_timeo > NFS_MAXTIMEO) 691 nmp->nm_timeo = NFS_MAXTIMEO; 692 } 693 694 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 695 nmp->nm_retry = argp->retrans; 696 if (nmp->nm_retry > NFS_MAXREXMIT) 697 nmp->nm_retry = NFS_MAXREXMIT; 698 } 699 700 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 701 702 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 703 nmp->nm_wsize = argp->wsize; 704 /* Round down to multiple of blocksize */ 705 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 706 if (nmp->nm_wsize <= 0) 707 nmp->nm_wsize = NFS_FABLKSIZE; 708 } 709 if (nmp->nm_wsize > maxio) 710 nmp->nm_wsize = maxio; 711 if (nmp->nm_wsize > MAXBSIZE) 712 nmp->nm_wsize = MAXBSIZE; 713 714 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 715 nmp->nm_rsize = argp->rsize; 716 /* Round down to multiple of blocksize */ 717 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 718 if (nmp->nm_rsize <= 0) 719 nmp->nm_rsize = NFS_FABLKSIZE; 720 } 721 if (nmp->nm_rsize > maxio) 722 nmp->nm_rsize = maxio; 723 if (nmp->nm_rsize > MAXBSIZE) 724 nmp->nm_rsize = MAXBSIZE; 725 726 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 727 nmp->nm_readdirsize = argp->readdirsize; 728 } 729 if (nmp->nm_readdirsize > maxio) 730 nmp->nm_readdirsize = maxio; 731 if (nmp->nm_readdirsize > nmp->nm_rsize) 732 nmp->nm_readdirsize = nmp->nm_rsize; 733 734 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 735 nmp->nm_acregmin = argp->acregmin; 736 else 737 nmp->nm_acregmin = NFS_MINATTRTIMO; 738 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 739 nmp->nm_acregmax = argp->acregmax; 740 else 741 nmp->nm_acregmax = NFS_MAXATTRTIMO; 742 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 743 nmp->nm_acdirmin = argp->acdirmin; 744 else 745 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 746 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 747 nmp->nm_acdirmax = argp->acdirmax; 748 else 749 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 750 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 751 nmp->nm_acdirmin = nmp->nm_acdirmax; 752 if (nmp->nm_acregmin > nmp->nm_acregmax) 753 nmp->nm_acregmin = nmp->nm_acregmax; 754 755 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 756 if (argp->maxgrouplist <= NFS_MAXGRPS) 757 nmp->nm_numgrps = argp->maxgrouplist; 758 else 759 nmp->nm_numgrps = NFS_MAXGRPS; 760 } 761 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 762 if (argp->readahead <= NFS_MAXRAHEAD) 763 nmp->nm_readahead = argp->readahead; 764 else 765 nmp->nm_readahead = NFS_MAXRAHEAD; 766 } 767 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 768 if (argp->deadthresh <= NFS_NEVERDEAD) 769 nmp->nm_deadthresh = argp->deadthresh; 770 else 771 nmp->nm_deadthresh = NFS_NEVERDEAD; 772 } 773 774 adjsock |= ((nmp->nm_sotype != argp->sotype) || 775 (nmp->nm_soproto != argp->proto)); 776 nmp->nm_sotype = argp->sotype; 777 nmp->nm_soproto = argp->proto; 778 779 if (nmp->nm_so && adjsock) { 780 nfs_safedisconnect(nmp); 781 if (nmp->nm_sotype == SOCK_DGRAM) 782 while (nfs_connect(nmp, (struct nfsreq *)0)) { 783 kprintf("nfs_args: retrying connect\n"); 784 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 785 } 786 } 787 } 788 789 /* 790 * VFS Operations. 791 * 792 * mount system call 793 * It seems a bit dumb to copyinstr() the host and path here and then 794 * bcopy() them in mountnfs(), but I wanted to detect errors before 795 * doing the sockargs() call because sockargs() allocates an mbuf and 796 * an error after that means that I have to release the mbuf. 797 */ 798 /* ARGSUSED */ 799 static int 800 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 801 { 802 int error; 803 struct nfs_args args; 804 struct sockaddr *nam; 805 struct vnode *vp; 806 char pth[MNAMELEN], hst[MNAMELEN]; 807 size_t len; 808 u_char nfh[NFSX_V3FHMAX]; 809 810 if (path == NULL) { 811 nfs_mountroot(mp); 812 return (0); 813 } 814 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 815 if (error) 816 return (error); 817 if (args.version != NFS_ARGSVERSION) { 818 #ifdef COMPAT_PRELITE2 819 /* 820 * If the argument version is unknown, then assume the 821 * caller is a pre-lite2 4.4BSD client and convert its 822 * arguments. 823 */ 824 struct onfs_args oargs; 825 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 826 if (error) 827 return (error); 828 nfs_convert_oargs(&args,&oargs); 829 #else /* !COMPAT_PRELITE2 */ 830 return (EPROGMISMATCH); 831 #endif /* COMPAT_PRELITE2 */ 832 } 833 if (mp->mnt_flag & MNT_UPDATE) { 834 struct nfsmount *nmp = VFSTONFS(mp); 835 836 if (nmp == NULL) 837 return (EIO); 838 /* 839 * When doing an update, we can't change from or to 840 * v3, or change cookie translation 841 */ 842 args.flags = (args.flags & 843 ~(NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)) | 844 (nmp->nm_flag & 845 (NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)); 846 nfs_decode_args(nmp, &args); 847 return (0); 848 } 849 850 /* 851 * Make the nfs_ip_paranoia sysctl serve as the default connection 852 * or no-connection mode for those protocols that support 853 * no-connection mode (the flag will be cleared later for protocols 854 * that do not support no-connection mode). This will allow a client 855 * to receive replies from a different IP then the request was 856 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 857 * not 0. 858 */ 859 if (nfs_ip_paranoia == 0) 860 args.flags |= NFSMNT_NOCONN; 861 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 862 return (EINVAL); 863 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 864 if (error) 865 return (error); 866 error = copyinstr(path, pth, MNAMELEN-1, &len); 867 if (error) 868 return (error); 869 bzero(&pth[len], MNAMELEN - len); 870 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 871 if (error) 872 return (error); 873 bzero(&hst[len], MNAMELEN - len); 874 /* sockargs() call must be after above copyin() calls */ 875 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 876 if (error) 877 return (error); 878 args.fh = nfh; 879 error = mountnfs(&args, mp, nam, pth, hst, &vp); 880 return (error); 881 } 882 883 /* 884 * Common code for mount and mountroot 885 */ 886 static int 887 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 888 char *pth, char *hst, struct vnode **vpp) 889 { 890 struct nfsmount *nmp; 891 struct nfsnode *np; 892 int error; 893 894 if (mp->mnt_flag & MNT_UPDATE) { 895 nmp = VFSTONFS(mp); 896 /* update paths, file handles, etc, here XXX */ 897 FREE(nam, M_SONAME); 898 return (0); 899 } else { 900 nmp = zalloc(nfsmount_zone); 901 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 902 TAILQ_INIT(&nmp->nm_uidlruhead); 903 TAILQ_INIT(&nmp->nm_bioq); 904 mp->mnt_data = (qaddr_t)nmp; 905 } 906 vfs_getnewfsid(mp); 907 nmp->nm_mountp = mp; 908 909 /* 910 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 911 * high, depending on whether we end up with negative offsets in 912 * the client or server somewhere. 2GB-1 may be safer. 913 * 914 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 915 * that we can handle until we find out otherwise. 916 * XXX Our "safe" limit on the client is what we can store in our 917 * buffer cache using signed(!) block numbers. 918 */ 919 if ((argp->flags & NFSMNT_NFSV3) == 0) 920 nmp->nm_maxfilesize = 0xffffffffLL; 921 else 922 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 923 924 nmp->nm_timeo = NFS_TIMEO; 925 nmp->nm_retry = NFS_RETRANS; 926 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 927 nmp->nm_rsize = nmp->nm_wsize; 928 nmp->nm_readdirsize = NFS_READDIRSIZE; 929 nmp->nm_numgrps = NFS_MAXGRPS; 930 nmp->nm_readahead = NFS_DEFRAHEAD; 931 nmp->nm_deadthresh = NFS_DEADTHRESH; 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 nmp->nm_nam = nam; 936 /* Set up the sockets and per-host congestion */ 937 nmp->nm_sotype = argp->sotype; 938 nmp->nm_soproto = argp->proto; 939 nmp->nm_cred = crhold(proc0.p_ucred); 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 = 958 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 959 960 /* 961 * Install vop_ops for our vnops 962 */ 963 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 964 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 965 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 966 967 /* 968 * A reference count is needed on the nfsnode representing the 969 * remote root. If this object is not persistent, then backward 970 * traversals of the mount point (i.e. "..") will not work if 971 * the nfsnode gets flushed out of the cache. Ufs does not have 972 * this problem, because one can identify root inodes by their 973 * number == ROOTINO (2). 974 */ 975 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 976 if (error) 977 goto bad; 978 *vpp = NFSTOV(np); 979 980 /* 981 * Retrieval of mountpoint attributes is delayed until nfs_rot 982 * or nfs_statfs are first called. This will happen either when 983 * we first traverse the mount point or if somebody does a df(1). 984 * 985 * NFSSTA_GOTFSINFO is used to flag if we have successfully 986 * retrieved mountpoint attributes. In the case of NFSv3 we 987 * also flag static fsinfo. 988 */ 989 if (*vpp != NULL) 990 (*vpp)->v_type = VNON; 991 992 /* 993 * Lose the lock but keep the ref. 994 */ 995 vn_unlock(*vpp); 996 997 return (0); 998 bad: 999 nfs_disconnect(nmp); 1000 nfs_free_mount(nmp); 1001 FREE(nam, M_SONAME); 1002 return (error); 1003 } 1004 1005 /* 1006 * unmount system call 1007 */ 1008 static int 1009 nfs_unmount(struct mount *mp, int mntflags) 1010 { 1011 struct nfsmount *nmp; 1012 int error, flags = 0; 1013 1014 if (mntflags & MNT_FORCE) 1015 flags |= FORCECLOSE; 1016 nmp = VFSTONFS(mp); 1017 /* 1018 * Goes something like this.. 1019 * - Call vflush() to clear out vnodes for this file system 1020 * - Close the socket 1021 * - Free up the data structures 1022 */ 1023 /* In the forced case, cancel any outstanding requests. */ 1024 if (flags & FORCECLOSE) { 1025 error = nfs_nmcancelreqs(nmp); 1026 if (error) 1027 return (error); 1028 } 1029 /* 1030 * Must handshake with nfs_clientd() if it is active. XXX 1031 */ 1032 nmp->nm_state |= NFSSTA_DISMINPROG; 1033 1034 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1035 error = vflush(mp, 1, flags); 1036 if (error) { 1037 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1038 return (error); 1039 } 1040 1041 /* 1042 * We are now committed to the unmount. 1043 * For NQNFS, let the server daemon free the nfsmount structure. 1044 */ 1045 if (nmp->nm_flag & NFSMNT_KERB) 1046 nmp->nm_state |= NFSSTA_DISMNT; 1047 1048 nfs_disconnect(nmp); 1049 FREE(nmp->nm_nam, M_SONAME); 1050 1051 if ((nmp->nm_flag & NFSMNT_KERB) == 0) 1052 nfs_free_mount(nmp); 1053 return (0); 1054 } 1055 1056 void 1057 nfs_free_mount(struct nfsmount *nmp) 1058 { 1059 if (nmp->nm_cred) { 1060 crfree(nmp->nm_cred); 1061 nmp->nm_cred = NULL; 1062 } 1063 zfree(nfsmount_zone, nmp); 1064 } 1065 1066 /* 1067 * Return root of a filesystem 1068 */ 1069 static int 1070 nfs_root(mp, vpp) 1071 struct mount *mp; 1072 struct vnode **vpp; 1073 { 1074 struct vnode *vp; 1075 struct nfsmount *nmp; 1076 struct vattr attrs; 1077 struct nfsnode *np; 1078 int error; 1079 1080 nmp = VFSTONFS(mp); 1081 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1082 if (error) 1083 return (error); 1084 vp = NFSTOV(np); 1085 1086 /* 1087 * Get transfer parameters and root vnode attributes 1088 */ 1089 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1090 if (nmp->nm_flag & NFSMNT_NFSV3) { 1091 nfs_fsinfo(nmp, vp, curthread); 1092 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1093 } else { 1094 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1095 nmp->nm_state |= NFSSTA_GOTFSINFO; 1096 1097 } 1098 } 1099 if (vp->v_type == VNON) 1100 nfs_setvtype(vp, VDIR); 1101 vp->v_flag = VROOT; 1102 *vpp = vp; 1103 return (0); 1104 } 1105 1106 extern int syncprt; 1107 1108 struct scaninfo { 1109 int rescan; 1110 int waitfor; 1111 int allerror; 1112 }; 1113 1114 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1115 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1116 1117 /* 1118 * Flush out the buffer cache 1119 */ 1120 /* ARGSUSED */ 1121 static int 1122 nfs_sync(struct mount *mp, int waitfor) 1123 { 1124 struct scaninfo scaninfo; 1125 int error; 1126 1127 scaninfo.rescan = 0; 1128 scaninfo.waitfor = waitfor; 1129 scaninfo.allerror = 0; 1130 1131 /* 1132 * Force stale buffer cache information to be flushed. 1133 */ 1134 error = 0; 1135 while (error == 0 && scaninfo.rescan) { 1136 scaninfo.rescan = 0; 1137 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1138 nfs_sync_scan2, &scaninfo); 1139 } 1140 return(error); 1141 } 1142 1143 static 1144 int 1145 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1146 { 1147 struct scaninfo *info = data; 1148 1149 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree)) 1150 return(-1); 1151 if (info->waitfor == MNT_LAZY) 1152 return(-1); 1153 return(0); 1154 } 1155 1156 static 1157 int 1158 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1159 { 1160 struct scaninfo *info = data; 1161 int error; 1162 1163 error = VOP_FSYNC(vp, info->waitfor); 1164 if (error) 1165 info->allerror = error; 1166 return(0); 1167 } 1168 1169