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 1.38 2006/04/07 06:38:33 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/kernel.h> 49 #include <sys/sysctl.h> 50 #include <sys/malloc.h> 51 #include <sys/mount.h> 52 #include <sys/mbuf.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/systm.h> 56 57 #include <vm/vm.h> 58 #include <vm/vm_extern.h> 59 #include <vm/vm_zone.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 #include <netinet/in.h> 64 65 #include <sys/thread2.h> 66 67 #include "rpcv2.h" 68 #include "nfsproto.h" 69 #include "nfs.h" 70 #include "nfsmount.h" 71 #include "nfsnode.h" 72 #include "xdr_subs.h" 73 #include "nfsm_subs.h" 74 #include "nfsdiskless.h" 75 #include "nfsmountrpc.h" 76 77 extern int nfs_mountroot(struct mount *mp); 78 extern void bootpc_init(void); 79 80 extern int nfs_ticks; 81 extern struct vnodeopv_entry_desc nfsv2_vnodeop_entries[]; 82 extern struct vnodeopv_entry_desc nfsv2_fifoop_entries[]; 83 extern struct vnodeopv_entry_desc nfsv2_specop_entries[]; 84 85 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 86 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 87 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 88 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 89 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 90 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 91 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 92 93 vm_zone_t nfsmount_zone; 94 95 struct nfsstats nfsstats; 96 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 97 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, 98 &nfsstats, nfsstats, ""); 99 static int nfs_ip_paranoia = 1; 100 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, 101 &nfs_ip_paranoia, 0, ""); 102 #ifdef NFS_DEBUG 103 int nfs_debug; 104 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 105 #endif 106 107 /* 108 * Tunable to determine the Read/Write unit size. Maximum value 109 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 110 */ 111 static int nfs_io_size = NFS_MAXDATA; 112 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 113 &nfs_io_size, 0, "NFS optimal I/O unit size"); 114 115 static void nfs_decode_args (struct nfsmount *nmp, 116 struct nfs_args *argp); 117 static int mountnfs (struct nfs_args *,struct mount *, 118 struct sockaddr *,char *,char *,struct vnode **); 119 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 120 struct thread *td); 121 static int nfs_unmount ( struct mount *mp, int mntflags, 122 struct thread *td); 123 static int nfs_root ( struct mount *mp, struct vnode **vpp); 124 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 125 struct thread *td); 126 static int nfs_sync ( struct mount *mp, int waitfor, 127 struct thread *td); 128 129 /* 130 * nfs vfs operations. 131 */ 132 static struct vfsops nfs_vfsops = { 133 .vfs_mount = nfs_mount, 134 .vfs_unmount = nfs_unmount, 135 .vfs_root = nfs_root, 136 .vfs_statfs = nfs_statfs, 137 .vfs_sync = nfs_sync, 138 .vfs_init = nfs_init, 139 .vfs_uninit = nfs_uninit 140 }; 141 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 142 143 /* 144 * This structure must be filled in by a primary bootstrap or bootstrap 145 * server for a diskless/dataless machine. It is initialized below just 146 * to ensure that it is allocated to initialized data (.data not .bss). 147 */ 148 struct nfs_diskless nfs_diskless = { { { 0 } } }; 149 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 150 int nfs_diskless_valid = 0; 151 152 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 153 &nfs_diskless_valid, 0, ""); 154 155 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 156 nfsv3_diskless.root_hostnam, 0, ""); 157 158 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 159 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 160 "%Ssockaddr_in", ""); 161 162 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 163 nfsv3_diskless.swap_hostnam, 0, ""); 164 165 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 166 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 167 "%Ssockaddr_in",""); 168 169 170 void nfsargs_ntoh (struct nfs_args *); 171 static int nfs_mountdiskless (char *, char *, int, 172 struct sockaddr_in *, struct nfs_args *, 173 struct thread *, struct vnode **, 174 struct mount **); 175 static void nfs_convert_diskless (void); 176 static void nfs_convert_oargs (struct nfs_args *args, 177 struct onfs_args *oargs); 178 179 /* 180 * Calculate the buffer I/O block size to use. The maximum V2 block size 181 * is typically 8K, the maximum datagram size is typically 16K, and the 182 * maximum V3 block size is typically 32K. The buffer cache tends to work 183 * best with 16K blocks but we allow 32K for TCP connections. 184 * 185 * We force the block size to be at least a page for buffer cache efficiency. 186 */ 187 static 188 int 189 nfs_iosize(int v3, int sotype) 190 { 191 int iosize; 192 int iomax; 193 194 if (v3) { 195 if (sotype == SOCK_STREAM) 196 iomax = NFS_MAXDATA; 197 else 198 iomax = NFS_MAXDGRAMDATA; 199 } else { 200 iomax = NFS_V2MAXDATA; 201 } 202 if ((iosize = nfs_io_size) > iomax) 203 iosize = iomax; 204 if (iosize < PAGE_SIZE) 205 iosize = PAGE_SIZE; 206 207 /* 208 * This is an aweful hack but until the buffer cache is rewritten 209 * we need it. The problem is that when you combine write() with 210 * mmap() the vm_page->valid bits can become weird looking 211 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 212 * at the file EOF. To solve the problem the BIO system needs to 213 * be guarenteed that the NFS iosize for regular files will be a 214 * multiple of PAGE_SIZE so it can invalidate the whole page 215 * rather then just the piece of it owned by the buffer when 216 * NFS does vinvalbuf() calls. 217 */ 218 if (iosize & PAGE_MASK) 219 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 220 return iosize; 221 } 222 223 static void 224 nfs_convert_oargs(args, oargs) 225 struct nfs_args *args; 226 struct onfs_args *oargs; 227 { 228 args->version = NFS_ARGSVERSION; 229 args->addr = oargs->addr; 230 args->addrlen = oargs->addrlen; 231 args->sotype = oargs->sotype; 232 args->proto = oargs->proto; 233 args->fh = oargs->fh; 234 args->fhsize = oargs->fhsize; 235 args->flags = oargs->flags; 236 args->wsize = oargs->wsize; 237 args->rsize = oargs->rsize; 238 args->readdirsize = oargs->readdirsize; 239 args->timeo = oargs->timeo; 240 args->retrans = oargs->retrans; 241 args->maxgrouplist = oargs->maxgrouplist; 242 args->readahead = oargs->readahead; 243 args->deadthresh = oargs->deadthresh; 244 args->hostname = oargs->hostname; 245 } 246 247 static void 248 nfs_convert_diskless() 249 { 250 int i; 251 252 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 253 sizeof(struct ifaliasreq)); 254 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 255 sizeof(struct sockaddr_in)); 256 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 257 258 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 259 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 260 for (i = NFSX_V2FH - 1; i >= 0; --i) { 261 if (nfs_diskless.swap_fh[i]) 262 break; 263 } 264 if (i < 0) 265 nfsv3_diskless.swap_fhsize = 0; 266 267 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 268 sizeof(struct sockaddr_in)); 269 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 270 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 271 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 272 sizeof(struct ucred)); 273 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 274 275 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 276 nfsv3_diskless.root_fhsize = NFSX_V2FH; 277 for (i = NFSX_V2FH - 1; i >= 0; --i) { 278 if (nfs_diskless.root_fh[i]) 279 break; 280 } 281 if (i < 0) 282 nfsv3_diskless.root_fhsize = 0; 283 284 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 285 sizeof(struct sockaddr_in)); 286 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 287 nfsv3_diskless.root_time = nfs_diskless.root_time; 288 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 289 MAXHOSTNAMELEN); 290 nfs_diskless_valid = 3; 291 } 292 293 /* 294 * nfs statfs call 295 */ 296 int 297 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 298 { 299 struct vnode *vp; 300 struct nfs_statfs *sfp; 301 caddr_t cp; 302 u_int32_t *tl; 303 int32_t t1, t2; 304 caddr_t bpos, dpos, cp2; 305 struct nfsmount *nmp = VFSTONFS(mp); 306 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 307 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 308 struct ucred *cred; 309 struct nfsnode *np; 310 u_quad_t tquad; 311 312 #ifndef nolint 313 sfp = (struct nfs_statfs *)0; 314 #endif 315 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 316 if (error) 317 return (error); 318 vp = NFSTOV(np); 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(mp) 443 struct mount *mp; 444 { 445 struct mount *swap_mp; 446 struct nfsv3_diskless *nd = &nfsv3_diskless; 447 struct socket *so; 448 struct vnode *vp; 449 struct thread *td = curthread; /* XXX */ 450 int error, i; 451 u_long l; 452 char buf[128]; 453 454 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 455 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 456 #endif 457 458 /* 459 * XXX time must be non-zero when we init the interface or else 460 * the arp code will wedge... 461 */ 462 while (mycpu->gd_time_seconds == 0) 463 tsleep(mycpu, 0, "arpkludge", 10); 464 465 /* 466 * The boot code may have passed us a diskless structure. 467 */ 468 if (nfs_diskless_valid == 1) 469 nfs_convert_diskless(); 470 471 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 472 printf("nfs_mountroot: interface %s ip %s", 473 nd->myif.ifra_name, 474 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 475 printf(" bcast %s", 476 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 477 printf(" mask %s\n", 478 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 479 #undef SINP 480 481 /* 482 * XXX splnet, so networks will receive... 483 */ 484 crit_enter(); 485 486 /* 487 * BOOTP does not necessarily have to be compiled into the kernel 488 * for an NFS root to work. If we inherited the network 489 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 490 * out our interface for us and all we need to do is ifconfig the 491 * interface. We only do this if the interface has not already been 492 * ifconfig'd by e.g. BOOTP. 493 */ 494 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 495 if (error) { 496 panic("nfs_mountroot: socreate(%04x): %d", 497 nd->myif.ifra_addr.sa_family, error); 498 } 499 500 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 501 if (error) 502 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 503 504 soclose(so); 505 506 /* 507 * If the gateway field is filled in, set it as the default route. 508 */ 509 if (nd->mygateway.sin_len != 0) { 510 struct sockaddr_in mask, sin; 511 512 bzero((caddr_t)&mask, sizeof(mask)); 513 sin = mask; 514 sin.sin_family = AF_INET; 515 sin.sin_len = sizeof(sin); 516 printf("nfs_mountroot: gateway %s\n", 517 inet_ntoa(nd->mygateway.sin_addr)); 518 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 519 (struct sockaddr *)&nd->mygateway, 520 (struct sockaddr *)&mask, 521 RTF_UP | RTF_GATEWAY); 522 if (error) 523 printf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 524 } 525 526 /* 527 * Create the rootfs mount point. 528 */ 529 nd->root_args.fh = nd->root_fh; 530 nd->root_args.fhsize = nd->root_fhsize; 531 l = ntohl(nd->root_saddr.sin_addr.s_addr); 532 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 533 (l >> 24) & 0xff, (l >> 16) & 0xff, 534 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 535 printf("NFS ROOT: %s\n",buf); 536 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 537 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 538 if (swap_mp) { 539 mp->mnt_vfc->vfc_refcount--; 540 free(swap_mp, M_MOUNT); 541 } 542 crit_exit(); 543 return (error); 544 } 545 546 swap_mp = NULL; 547 if (nd->swap_nblks) { 548 549 /* Convert to DEV_BSIZE instead of Kilobyte */ 550 nd->swap_nblks *= 2; 551 552 /* 553 * Create a fake mount point just for the swap vnode so that the 554 * swap file can be on a different server from the rootfs. 555 */ 556 nd->swap_args.fh = nd->swap_fh; 557 nd->swap_args.fhsize = nd->swap_fhsize; 558 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 559 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 560 (l >> 24) & 0xff, (l >> 16) & 0xff, 561 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 562 printf("NFS SWAP: %s\n",buf); 563 if ((error = nfs_mountdiskless(buf, "/swap", 0, 564 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) { 565 crit_exit(); 566 return (error); 567 } 568 vfs_unbusy(swap_mp, td); 569 570 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 571 nd->swap_nblks * DEV_BSIZE ; 572 573 /* 574 * Since the swap file is not the root dir of a file system, 575 * hack it to a regular file. 576 */ 577 vp->v_flag = 0; 578 vref(vp); 579 nfs_setvtype(vp, VREG); 580 swaponvp(td, vp, nd->swap_nblks); 581 } 582 583 mp->mnt_flag |= MNT_ROOTFS; 584 mp->mnt_vnodecovered = NULLVP; 585 vfs_unbusy(mp, td); 586 587 /* 588 * This is not really an nfs issue, but it is much easier to 589 * set hostname here and then let the "/etc/rc.xxx" files 590 * mount the right /var based upon its preset value. 591 */ 592 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 593 hostname[MAXHOSTNAMELEN - 1] = '\0'; 594 for (i = 0; i < MAXHOSTNAMELEN; i++) 595 if (hostname[i] == '\0') 596 break; 597 inittodr(ntohl(nd->root_time)); 598 crit_exit(); 599 return (0); 600 } 601 602 /* 603 * Internal version of mount system call for diskless setup. 604 */ 605 static int 606 nfs_mountdiskless(char *path, char *which, int mountflag, 607 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 608 struct vnode **vpp, struct mount **mpp) 609 { 610 struct mount *mp; 611 struct sockaddr *nam; 612 int didalloc = 0; 613 int error; 614 615 mp = *mpp; 616 617 if (mp == NULL) { 618 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 619 printf("nfs_mountroot: NFS not configured"); 620 return (error); 621 } 622 didalloc = 1; 623 } 624 mp->mnt_kern_flag = 0; 625 mp->mnt_flag = mountflag; 626 nam = dup_sockaddr((struct sockaddr *)sin); 627 628 #if defined(BOOTP) || defined(NFS_ROOT) 629 if (args->fhsize == 0) { 630 printf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 631 args->fhsize = 0; 632 error = md_mount(sin, which, args->fh, &args->fhsize, args, td); 633 if (error) { 634 printf("failed.\n"); 635 goto haderror; 636 } 637 printf("success!\n"); 638 } 639 #endif 640 641 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 642 #if defined(BOOTP) || defined(NFS_ROOT) 643 haderror: 644 #endif 645 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 646 mp->mnt_vfc->vfc_refcount--; 647 vfs_unbusy(mp, td); 648 if (didalloc) 649 free(mp, M_MOUNT); 650 FREE(nam, M_SONAME); 651 return (error); 652 } 653 *mpp = mp; 654 return (0); 655 } 656 657 static void 658 nfs_decode_args(nmp, argp) 659 struct nfsmount *nmp; 660 struct nfs_args *argp; 661 { 662 int adjsock; 663 int maxio; 664 665 crit_enter(); 666 /* 667 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 668 * no sense in that context. 669 */ 670 if (argp->sotype == SOCK_STREAM) 671 nmp->nm_flag &= ~NFSMNT_NOCONN; 672 673 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 674 if ((argp->flags & NFSMNT_NFSV3) == 0) 675 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 676 677 /* Re-bind if rsrvd port requested and wasn't on one */ 678 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 679 && (argp->flags & NFSMNT_RESVPORT); 680 /* Also re-bind if we're switching to/from a connected UDP socket */ 681 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 682 (argp->flags & NFSMNT_NOCONN)); 683 684 /* Update flags atomically. Don't change the lock bits. */ 685 nmp->nm_flag = argp->flags | nmp->nm_flag; 686 crit_exit(); 687 688 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 689 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 690 if (nmp->nm_timeo < NFS_MINTIMEO) 691 nmp->nm_timeo = NFS_MINTIMEO; 692 else if (nmp->nm_timeo > NFS_MAXTIMEO) 693 nmp->nm_timeo = NFS_MAXTIMEO; 694 } 695 696 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 697 nmp->nm_retry = argp->retrans; 698 if (nmp->nm_retry > NFS_MAXREXMIT) 699 nmp->nm_retry = NFS_MAXREXMIT; 700 } 701 702 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 703 704 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 705 nmp->nm_wsize = argp->wsize; 706 /* Round down to multiple of blocksize */ 707 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 708 if (nmp->nm_wsize <= 0) 709 nmp->nm_wsize = NFS_FABLKSIZE; 710 } 711 if (nmp->nm_wsize > maxio) 712 nmp->nm_wsize = maxio; 713 if (nmp->nm_wsize > MAXBSIZE) 714 nmp->nm_wsize = MAXBSIZE; 715 716 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 717 nmp->nm_rsize = argp->rsize; 718 /* Round down to multiple of blocksize */ 719 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 720 if (nmp->nm_rsize <= 0) 721 nmp->nm_rsize = NFS_FABLKSIZE; 722 } 723 if (nmp->nm_rsize > maxio) 724 nmp->nm_rsize = maxio; 725 if (nmp->nm_rsize > MAXBSIZE) 726 nmp->nm_rsize = MAXBSIZE; 727 728 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 729 nmp->nm_readdirsize = argp->readdirsize; 730 } 731 if (nmp->nm_readdirsize > maxio) 732 nmp->nm_readdirsize = maxio; 733 if (nmp->nm_readdirsize > nmp->nm_rsize) 734 nmp->nm_readdirsize = nmp->nm_rsize; 735 736 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 737 nmp->nm_acregmin = argp->acregmin; 738 else 739 nmp->nm_acregmin = NFS_MINATTRTIMO; 740 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 741 nmp->nm_acregmax = argp->acregmax; 742 else 743 nmp->nm_acregmax = NFS_MAXATTRTIMO; 744 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 745 nmp->nm_acdirmin = argp->acdirmin; 746 else 747 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 748 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 749 nmp->nm_acdirmax = argp->acdirmax; 750 else 751 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 752 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 753 nmp->nm_acdirmin = nmp->nm_acdirmax; 754 if (nmp->nm_acregmin > nmp->nm_acregmax) 755 nmp->nm_acregmin = nmp->nm_acregmax; 756 757 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 758 if (argp->maxgrouplist <= NFS_MAXGRPS) 759 nmp->nm_numgrps = argp->maxgrouplist; 760 else 761 nmp->nm_numgrps = NFS_MAXGRPS; 762 } 763 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 764 if (argp->readahead <= NFS_MAXRAHEAD) 765 nmp->nm_readahead = argp->readahead; 766 else 767 nmp->nm_readahead = NFS_MAXRAHEAD; 768 } 769 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 770 if (argp->deadthresh <= NFS_NEVERDEAD) 771 nmp->nm_deadthresh = argp->deadthresh; 772 else 773 nmp->nm_deadthresh = NFS_NEVERDEAD; 774 } 775 776 adjsock |= ((nmp->nm_sotype != argp->sotype) || 777 (nmp->nm_soproto != argp->proto)); 778 nmp->nm_sotype = argp->sotype; 779 nmp->nm_soproto = argp->proto; 780 781 if (nmp->nm_so && adjsock) { 782 nfs_safedisconnect(nmp); 783 if (nmp->nm_sotype == SOCK_DGRAM) 784 while (nfs_connect(nmp, (struct nfsreq *)0)) { 785 printf("nfs_args: retrying connect\n"); 786 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 787 } 788 } 789 } 790 791 /* 792 * VFS Operations. 793 * 794 * mount system call 795 * It seems a bit dumb to copyinstr() the host and path here and then 796 * bcopy() them in mountnfs(), but I wanted to detect errors before 797 * doing the sockargs() call because sockargs() allocates an mbuf and 798 * an error after that means that I have to release the mbuf. 799 */ 800 /* ARGSUSED */ 801 static int 802 nfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td) 803 { 804 int error; 805 struct nfs_args args; 806 struct sockaddr *nam; 807 struct vnode *vp; 808 char pth[MNAMELEN], hst[MNAMELEN]; 809 size_t len; 810 u_char nfh[NFSX_V3FHMAX]; 811 812 if (path == NULL) { 813 nfs_mountroot(mp); 814 return (0); 815 } 816 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 817 if (error) 818 return (error); 819 if (args.version != NFS_ARGSVERSION) { 820 #ifdef COMPAT_PRELITE2 821 /* 822 * If the argument version is unknown, then assume the 823 * caller is a pre-lite2 4.4BSD client and convert its 824 * arguments. 825 */ 826 struct onfs_args oargs; 827 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 828 if (error) 829 return (error); 830 nfs_convert_oargs(&args,&oargs); 831 #else /* !COMPAT_PRELITE2 */ 832 return (EPROGMISMATCH); 833 #endif /* COMPAT_PRELITE2 */ 834 } 835 if (mp->mnt_flag & MNT_UPDATE) { 836 struct nfsmount *nmp = VFSTONFS(mp); 837 838 if (nmp == NULL) 839 return (EIO); 840 /* 841 * When doing an update, we can't change from or to 842 * v3, or change cookie translation 843 */ 844 args.flags = (args.flags & 845 ~(NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)) | 846 (nmp->nm_flag & 847 (NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)); 848 nfs_decode_args(nmp, &args); 849 return (0); 850 } 851 852 /* 853 * Make the nfs_ip_paranoia sysctl serve as the default connection 854 * or no-connection mode for those protocols that support 855 * no-connection mode (the flag will be cleared later for protocols 856 * that do not support no-connection mode). This will allow a client 857 * to receive replies from a different IP then the request was 858 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 859 * not 0. 860 */ 861 if (nfs_ip_paranoia == 0) 862 args.flags |= NFSMNT_NOCONN; 863 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 864 return (EINVAL); 865 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 866 if (error) 867 return (error); 868 error = copyinstr(path, pth, MNAMELEN-1, &len); 869 if (error) 870 return (error); 871 bzero(&pth[len], MNAMELEN - len); 872 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 873 if (error) 874 return (error); 875 bzero(&hst[len], MNAMELEN - len); 876 /* sockargs() call must be after above copyin() calls */ 877 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 878 if (error) 879 return (error); 880 args.fh = nfh; 881 error = mountnfs(&args, mp, nam, pth, hst, &vp); 882 return (error); 883 } 884 885 /* 886 * Common code for mount and mountroot 887 */ 888 static int 889 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 890 char *pth, char *hst, struct vnode **vpp) 891 { 892 struct nfsmount *nmp; 893 struct nfsnode *np; 894 int error; 895 896 if (mp->mnt_flag & MNT_UPDATE) { 897 nmp = VFSTONFS(mp); 898 /* update paths, file handles, etc, here XXX */ 899 FREE(nam, M_SONAME); 900 return (0); 901 } else { 902 nmp = zalloc(nfsmount_zone); 903 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 904 TAILQ_INIT(&nmp->nm_uidlruhead); 905 TAILQ_INIT(&nmp->nm_bioq); 906 mp->mnt_data = (qaddr_t)nmp; 907 } 908 vfs_getnewfsid(mp); 909 nmp->nm_mountp = mp; 910 911 /* 912 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 913 * high, depending on whether we end up with negative offsets in 914 * the client or server somewhere. 2GB-1 may be safer. 915 * 916 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 917 * that we can handle until we find out otherwise. 918 * XXX Our "safe" limit on the client is what we can store in our 919 * buffer cache using signed(!) block numbers. 920 */ 921 if ((argp->flags & NFSMNT_NFSV3) == 0) 922 nmp->nm_maxfilesize = 0xffffffffLL; 923 else 924 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 925 926 nmp->nm_timeo = NFS_TIMEO; 927 nmp->nm_retry = NFS_RETRANS; 928 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 929 nmp->nm_rsize = nmp->nm_wsize; 930 nmp->nm_readdirsize = NFS_READDIRSIZE; 931 nmp->nm_numgrps = NFS_MAXGRPS; 932 nmp->nm_readahead = NFS_DEFRAHEAD; 933 nmp->nm_deadthresh = NFS_DEADTHRESH; 934 nmp->nm_fhsize = argp->fhsize; 935 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 936 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 937 nmp->nm_nam = nam; 938 /* Set up the sockets and per-host congestion */ 939 nmp->nm_sotype = argp->sotype; 940 nmp->nm_soproto = argp->proto; 941 nmp->nm_cred = crhold(proc0.p_ucred); 942 943 nfs_decode_args(nmp, argp); 944 945 /* 946 * For Connection based sockets (TCP,...) defer the connect until 947 * the first request, in case the server is not responding. 948 */ 949 if (nmp->nm_sotype == SOCK_DGRAM && 950 (error = nfs_connect(nmp, (struct nfsreq *)0))) 951 goto bad; 952 953 /* 954 * This is silly, but it has to be set so that vinifod() works. 955 * We do not want to do an nfs_statfs() here since we can get 956 * stuck on a dead server and we are holding a lock on the mount 957 * point. 958 */ 959 mp->mnt_stat.f_iosize = 960 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 961 962 /* 963 * Install vop_ops for our vnops 964 */ 965 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, 966 nfsv2_vnodeop_entries, 0); 967 vfs_add_vnodeops(mp, &mp->mnt_vn_spec_ops, 968 nfsv2_specop_entries, 0); 969 vfs_add_vnodeops(mp, &mp->mnt_vn_fifo_ops, 970 nfsv2_fifoop_entries, 0); 971 972 /* 973 * A reference count is needed on the nfsnode representing the 974 * remote root. If this object is not persistent, then backward 975 * traversals of the mount point (i.e. "..") will not work if 976 * the nfsnode gets flushed out of the cache. Ufs does not have 977 * this problem, because one can identify root inodes by their 978 * number == ROOTINO (2). 979 */ 980 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 981 if (error) 982 goto bad; 983 *vpp = NFSTOV(np); 984 985 /* 986 * Retrieval of mountpoint attributes is delayed until nfs_rot 987 * or nfs_statfs are first called. This will happen either when 988 * we first traverse the mount point or if somebody does a df(1). 989 * 990 * NFSSTA_GOTFSINFO is used to flag if we have successfully 991 * retrieved mountpoint attributes. In the case of NFSv3 we 992 * also flag static fsinfo. 993 */ 994 if (*vpp != NULL) 995 (*vpp)->v_type = VNON; 996 997 /* 998 * Lose the lock but keep the ref. 999 */ 1000 VOP_UNLOCK(*vpp, 0, curthread); 1001 1002 return (0); 1003 bad: 1004 nfs_disconnect(nmp); 1005 nfs_free_mount(nmp); 1006 FREE(nam, M_SONAME); 1007 return (error); 1008 } 1009 1010 /* 1011 * unmount system call 1012 */ 1013 static int 1014 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 1015 { 1016 struct nfsmount *nmp; 1017 int error, flags = 0; 1018 1019 if (mntflags & MNT_FORCE) 1020 flags |= FORCECLOSE; 1021 nmp = VFSTONFS(mp); 1022 /* 1023 * Goes something like this.. 1024 * - Call vflush() to clear out vnodes for this file system 1025 * - Close the socket 1026 * - Free up the data structures 1027 */ 1028 /* In the forced case, cancel any outstanding requests. */ 1029 if (flags & FORCECLOSE) { 1030 error = nfs_nmcancelreqs(nmp); 1031 if (error) 1032 return (error); 1033 } 1034 /* 1035 * Must handshake with nfs_clientd() if it is active. XXX 1036 */ 1037 nmp->nm_state |= NFSSTA_DISMINPROG; 1038 1039 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1040 error = vflush(mp, 1, flags); 1041 if (error) { 1042 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1043 return (error); 1044 } 1045 1046 /* 1047 * We are now committed to the unmount. 1048 * For NQNFS, let the server daemon free the nfsmount structure. 1049 */ 1050 if (nmp->nm_flag & NFSMNT_KERB) 1051 nmp->nm_state |= NFSSTA_DISMNT; 1052 1053 nfs_disconnect(nmp); 1054 FREE(nmp->nm_nam, M_SONAME); 1055 1056 if ((nmp->nm_flag & NFSMNT_KERB) == 0) 1057 nfs_free_mount(nmp); 1058 return (0); 1059 } 1060 1061 void 1062 nfs_free_mount(struct nfsmount *nmp) 1063 { 1064 if (nmp->nm_cred) { 1065 crfree(nmp->nm_cred); 1066 nmp->nm_cred = NULL; 1067 } 1068 zfree(nfsmount_zone, nmp); 1069 } 1070 1071 /* 1072 * Return root of a filesystem 1073 */ 1074 static int 1075 nfs_root(mp, vpp) 1076 struct mount *mp; 1077 struct vnode **vpp; 1078 { 1079 struct vnode *vp; 1080 struct nfsmount *nmp; 1081 struct vattr attrs; 1082 struct nfsnode *np; 1083 int error; 1084 1085 nmp = VFSTONFS(mp); 1086 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1087 if (error) 1088 return (error); 1089 vp = NFSTOV(np); 1090 1091 /* 1092 * Get transfer parameters and root vnode attributes 1093 */ 1094 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1095 if (nmp->nm_flag & NFSMNT_NFSV3) { 1096 nfs_fsinfo(nmp, vp, curthread); 1097 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1098 } else { 1099 if ((error = VOP_GETATTR(vp, &attrs, curthread)) == 0) 1100 nmp->nm_state |= NFSSTA_GOTFSINFO; 1101 1102 } 1103 } 1104 if (vp->v_type == VNON) 1105 nfs_setvtype(vp, VDIR); 1106 vp->v_flag = VROOT; 1107 *vpp = vp; 1108 return (0); 1109 } 1110 1111 extern int syncprt; 1112 1113 struct scaninfo { 1114 int rescan; 1115 thread_t td; 1116 int waitfor; 1117 int allerror; 1118 }; 1119 1120 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1121 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1122 1123 /* 1124 * Flush out the buffer cache 1125 */ 1126 /* ARGSUSED */ 1127 static int 1128 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 1129 { 1130 struct scaninfo scaninfo; 1131 int error; 1132 1133 scaninfo.rescan = 0; 1134 scaninfo.td = td; 1135 scaninfo.waitfor = waitfor; 1136 scaninfo.allerror = 0; 1137 1138 /* 1139 * Force stale buffer cache information to be flushed. 1140 */ 1141 error = 0; 1142 while (error == 0 && scaninfo.rescan) { 1143 scaninfo.rescan = 0; 1144 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1145 nfs_sync_scan2, &scaninfo); 1146 } 1147 return(error); 1148 } 1149 1150 static 1151 int 1152 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1153 { 1154 struct scaninfo *info = data; 1155 1156 if (VOP_ISLOCKED(vp, NULL) || RB_EMPTY(&vp->v_rbdirty_tree)) 1157 return(-1); 1158 if (info->waitfor == MNT_LAZY) 1159 return(-1); 1160 return(0); 1161 } 1162 1163 static 1164 int 1165 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1166 { 1167 struct scaninfo *info = data; 1168 int error; 1169 1170 error = VOP_FSYNC(vp, info->waitfor, info->td); 1171 if (error) 1172 info->allerror = error; 1173 return(0); 1174 } 1175 1176