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 1.54 2008/07/31 20:23:40 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 int 187 nfs_iosize(int v3, int sotype) 188 { 189 int iosize; 190 int iomax; 191 192 if (v3) { 193 if (sotype == SOCK_STREAM) 194 iomax = NFS_MAXDATA; 195 else 196 iomax = NFS_MAXDGRAMDATA; 197 } else { 198 iomax = NFS_V2MAXDATA; 199 } 200 if ((iosize = nfs_io_size) > iomax) 201 iosize = iomax; 202 if (iosize < PAGE_SIZE) 203 iosize = PAGE_SIZE; 204 205 /* 206 * This is an aweful hack but until the buffer cache is rewritten 207 * we need it. The problem is that when you combine write() with 208 * mmap() the vm_page->valid bits can become weird looking 209 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 210 * at the file EOF. To solve the problem the BIO system needs to 211 * be guarenteed that the NFS iosize for regular files will be a 212 * multiple of PAGE_SIZE so it can invalidate the whole page 213 * rather then just the piece of it owned by the buffer when 214 * NFS does vinvalbuf() calls. 215 */ 216 if (iosize & PAGE_MASK) 217 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 218 return iosize; 219 } 220 221 static void 222 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 223 { 224 args->version = NFS_ARGSVERSION; 225 args->addr = oargs->addr; 226 args->addrlen = oargs->addrlen; 227 args->sotype = oargs->sotype; 228 args->proto = oargs->proto; 229 args->fh = oargs->fh; 230 args->fhsize = oargs->fhsize; 231 args->flags = oargs->flags; 232 args->wsize = oargs->wsize; 233 args->rsize = oargs->rsize; 234 args->readdirsize = oargs->readdirsize; 235 args->timeo = oargs->timeo; 236 args->retrans = oargs->retrans; 237 args->maxgrouplist = oargs->maxgrouplist; 238 args->readahead = oargs->readahead; 239 args->deadthresh = oargs->deadthresh; 240 args->hostname = oargs->hostname; 241 } 242 243 static void 244 nfs_convert_diskless(void) 245 { 246 int i; 247 248 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 249 sizeof(struct ifaliasreq)); 250 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 251 sizeof(struct sockaddr_in)); 252 nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args); 253 254 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 255 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 256 for (i = NFSX_V2FH - 1; i >= 0; --i) { 257 if (nfs_diskless.swap_fh[i]) 258 break; 259 } 260 if (i < 0) 261 nfsv3_diskless.swap_fhsize = 0; 262 263 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 264 sizeof(struct sockaddr_in)); 265 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 266 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 267 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 268 sizeof(struct ucred)); 269 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 270 271 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 272 nfsv3_diskless.root_fhsize = NFSX_V2FH; 273 for (i = NFSX_V2FH - 1; i >= 0; --i) { 274 if (nfs_diskless.root_fh[i]) 275 break; 276 } 277 if (i < 0) 278 nfsv3_diskless.root_fhsize = 0; 279 280 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 281 sizeof(struct sockaddr_in)); 282 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 283 nfsv3_diskless.root_time = nfs_diskless.root_time; 284 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 285 MAXHOSTNAMELEN); 286 nfs_diskless_valid = 3; 287 } 288 289 /* 290 * nfs statfs call 291 */ 292 int 293 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 294 { 295 struct vnode *vp; 296 struct nfs_statfs *sfp; 297 caddr_t cp; 298 u_int32_t *tl; 299 int32_t t1, t2; 300 caddr_t bpos, dpos, cp2; 301 struct nfsmount *nmp = VFSTONFS(mp); 302 thread_t td = curthread; 303 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 304 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 305 struct nfsnode *np; 306 u_quad_t tquad; 307 308 #ifndef nolint 309 sfp = NULL; 310 #endif 311 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 312 if (error) 313 return (error); 314 vp = NFSTOV(np); 315 /* ignore the passed cred */ 316 cred = crget(); 317 cred->cr_ngroups = 1; 318 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 319 (void)nfs_fsinfo(nmp, vp, td); 320 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 321 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 322 nfsm_fhtom(vp, v3); 323 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 324 if (v3) 325 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 326 if (error) { 327 if (mrep != NULL) 328 m_freem(mrep); 329 goto nfsmout; 330 } 331 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 332 sbp->f_flags = nmp->nm_flag; 333 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 334 335 if (v3) { 336 sbp->f_bsize = NFS_FABLKSIZE; 337 tquad = fxdr_hyper(&sfp->sf_tbytes); 338 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 339 tquad = fxdr_hyper(&sfp->sf_fbytes); 340 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 341 tquad = fxdr_hyper(&sfp->sf_abytes); 342 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 343 sbp->f_files = (fxdr_unsigned(int32_t, 344 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 345 sbp->f_ffree = (fxdr_unsigned(int32_t, 346 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 347 } else { 348 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 349 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 350 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 351 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 352 sbp->f_files = 0; 353 sbp->f_ffree = 0; 354 } 355 if (sbp != &mp->mnt_stat) { 356 sbp->f_type = mp->mnt_vfc->vfc_typenum; 357 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 358 } 359 m_freem(mrep); 360 nfsmout: 361 vput(vp); 362 crfree(cred); 363 return (error); 364 } 365 366 /* 367 * nfs version 3 fsinfo rpc call 368 */ 369 int 370 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 371 { 372 struct nfsv3_fsinfo *fsp; 373 caddr_t cp; 374 int32_t t1, t2; 375 u_int32_t *tl, pref, max; 376 caddr_t bpos, dpos, cp2; 377 int error = 0, retattr; 378 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 379 u_int64_t maxfsize; 380 381 nfsstats.rpccnt[NFSPROC_FSINFO]++; 382 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 383 nfsm_fhtom(vp, 1); 384 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 385 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 386 if (!error) { 387 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 388 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 389 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 390 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 391 ~(NFS_FABLKSIZE - 1); 392 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 393 if (max < nmp->nm_wsize && max > 0) { 394 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 395 if (nmp->nm_wsize == 0) 396 nmp->nm_wsize = max; 397 } 398 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 399 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 400 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 401 ~(NFS_FABLKSIZE - 1); 402 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 403 if (max < nmp->nm_rsize && max > 0) { 404 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 405 if (nmp->nm_rsize == 0) 406 nmp->nm_rsize = max; 407 } 408 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 409 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 410 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 411 ~(NFS_DIRBLKSIZ - 1); 412 if (max < nmp->nm_readdirsize && max > 0) { 413 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 414 if (nmp->nm_readdirsize == 0) 415 nmp->nm_readdirsize = max; 416 } 417 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 418 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 419 nmp->nm_maxfilesize = maxfsize; 420 nmp->nm_state |= NFSSTA_GOTFSINFO; 421 } 422 m_freem(mrep); 423 nfsmout: 424 return (error); 425 } 426 427 /* 428 * Mount a remote root fs via. nfs. This depends on the info in the 429 * nfs_diskless structure that has been filled in properly by some primary 430 * bootstrap. 431 * It goes something like this: 432 * - do enough of "ifconfig" by calling ifioctl() so that the system 433 * can talk to the server 434 * - If nfs_diskless.mygateway is filled in, use that address as 435 * a default gateway. 436 * - build the rootfs mount point and call mountnfs() to do the rest. 437 */ 438 int 439 nfs_mountroot(struct mount *mp) 440 { 441 struct mount *swap_mp; 442 struct nfsv3_diskless *nd = &nfsv3_diskless; 443 struct socket *so; 444 struct vnode *vp; 445 struct thread *td = curthread; /* XXX */ 446 int error, i; 447 u_long l; 448 char buf[128]; 449 450 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 451 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 452 #endif 453 454 /* 455 * XXX time must be non-zero when we init the interface or else 456 * the arp code will wedge... 457 */ 458 while (mycpu->gd_time_seconds == 0) 459 tsleep(mycpu, 0, "arpkludge", 10); 460 461 /* 462 * The boot code may have passed us a diskless structure. 463 */ 464 if (nfs_diskless_valid == 1) 465 nfs_convert_diskless(); 466 467 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 468 kprintf("nfs_mountroot: interface %s ip %s", 469 nd->myif.ifra_name, 470 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 471 kprintf(" bcast %s", 472 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 473 kprintf(" mask %s\n", 474 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 475 #undef SINP 476 477 /* 478 * XXX splnet, so networks will receive... 479 */ 480 crit_enter(); 481 482 /* 483 * BOOTP does not necessarily have to be compiled into the kernel 484 * for an NFS root to work. If we inherited the network 485 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 486 * out our interface for us and all we need to do is ifconfig the 487 * interface. We only do this if the interface has not already been 488 * ifconfig'd by e.g. BOOTP. 489 */ 490 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 491 if (error) { 492 panic("nfs_mountroot: socreate(%04x): %d", 493 nd->myif.ifra_addr.sa_family, error); 494 } 495 496 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 497 if (error) 498 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 499 500 soclose(so, FNONBLOCK); 501 502 /* 503 * If the gateway field is filled in, set it as the default route. 504 */ 505 if (nd->mygateway.sin_len != 0) { 506 struct sockaddr_in mask, sin; 507 508 bzero((caddr_t)&mask, sizeof(mask)); 509 sin = mask; 510 sin.sin_family = AF_INET; 511 sin.sin_len = sizeof(sin); 512 kprintf("nfs_mountroot: gateway %s\n", 513 inet_ntoa(nd->mygateway.sin_addr)); 514 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 515 (struct sockaddr *)&nd->mygateway, 516 (struct sockaddr *)&mask, 517 RTF_UP | RTF_GATEWAY); 518 if (error) 519 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 520 } 521 522 /* 523 * Create the rootfs mount point. 524 */ 525 nd->root_args.fh = nd->root_fh; 526 nd->root_args.fhsize = nd->root_fhsize; 527 l = ntohl(nd->root_saddr.sin_addr.s_addr); 528 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 529 (l >> 24) & 0xff, (l >> 16) & 0xff, 530 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 531 kprintf("NFS_ROOT: %s\n",buf); 532 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 533 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 534 mp->mnt_vfc->vfc_refcount--; 535 crit_exit(); 536 return (error); 537 } 538 539 swap_mp = NULL; 540 if (nd->swap_nblks) { 541 542 /* Convert to DEV_BSIZE instead of Kilobyte */ 543 nd->swap_nblks *= 2; 544 545 /* 546 * Create a fake mount point just for the swap vnode so that the 547 * swap file can be on a different server from the rootfs. 548 */ 549 nd->swap_args.fh = nd->swap_fh; 550 nd->swap_args.fhsize = nd->swap_fhsize; 551 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 552 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 553 (l >> 24) & 0xff, (l >> 16) & 0xff, 554 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 555 kprintf("NFS SWAP: %s\n",buf); 556 if ((error = nfs_mountdiskless(buf, "/swap", 0, 557 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) { 558 crit_exit(); 559 return (error); 560 } 561 vfs_unbusy(swap_mp); 562 563 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 564 nd->swap_nblks * DEV_BSIZE ; 565 566 /* 567 * Since the swap file is not the root dir of a file system, 568 * hack it to a regular file. 569 */ 570 vp->v_flag = 0; 571 vref(vp); 572 nfs_setvtype(vp, VREG); 573 swaponvp(td, vp, nd->swap_nblks); 574 } 575 576 mp->mnt_flag |= MNT_ROOTFS; 577 vfs_unbusy(mp); 578 579 /* 580 * This is not really an nfs issue, but it is much easier to 581 * set hostname here and then let the "/etc/rc.xxx" files 582 * mount the right /var based upon its preset value. 583 */ 584 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 585 hostname[MAXHOSTNAMELEN - 1] = '\0'; 586 for (i = 0; i < MAXHOSTNAMELEN; i++) 587 if (hostname[i] == '\0') 588 break; 589 inittodr(ntohl(nd->root_time)); 590 crit_exit(); 591 return (0); 592 } 593 594 /* 595 * Internal version of mount system call for diskless setup. 596 */ 597 static int 598 nfs_mountdiskless(char *path, char *which, int mountflag, 599 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 600 struct vnode **vpp, struct mount **mpp) 601 { 602 struct mount *mp; 603 struct sockaddr *nam; 604 int didalloc = 0; 605 int error; 606 607 mp = *mpp; 608 609 if (mp == NULL) { 610 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 611 kprintf("nfs_mountroot: NFS not configured"); 612 return (error); 613 } 614 didalloc = 1; 615 } 616 mp->mnt_kern_flag = 0; 617 mp->mnt_flag = mountflag; 618 nam = dup_sockaddr((struct sockaddr *)sin); 619 620 #if defined(BOOTP) || defined(NFS_ROOT) 621 if (args->fhsize == 0) { 622 char *xpath = path; 623 624 kprintf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 625 while (*xpath && *xpath != ':') 626 ++xpath; 627 if (*xpath) 628 ++xpath; 629 args->fhsize = 0; 630 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 631 if (error) { 632 kprintf("failed error %d.\n", error); 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(struct nfsmount *nmp, struct nfs_args *argp) 657 { 658 int adjsock; 659 int maxio; 660 661 crit_enter(); 662 /* 663 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 664 * no sense in that context. 665 */ 666 if (argp->sotype == SOCK_STREAM) 667 nmp->nm_flag &= ~NFSMNT_NOCONN; 668 669 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 670 if ((argp->flags & NFSMNT_NFSV3) == 0) 671 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 672 673 /* Re-bind if rsrvd port requested and wasn't on one */ 674 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 675 && (argp->flags & NFSMNT_RESVPORT); 676 /* Also re-bind if we're switching to/from a connected UDP socket */ 677 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 678 (argp->flags & NFSMNT_NOCONN)); 679 680 /* Update flags atomically. Don't change the lock bits. */ 681 nmp->nm_flag = argp->flags | nmp->nm_flag; 682 crit_exit(); 683 684 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 685 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 686 if (nmp->nm_timeo < NFS_MINTIMEO) 687 nmp->nm_timeo = NFS_MINTIMEO; 688 else if (nmp->nm_timeo > NFS_MAXTIMEO) 689 nmp->nm_timeo = NFS_MAXTIMEO; 690 } 691 692 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 693 nmp->nm_retry = argp->retrans; 694 if (nmp->nm_retry > NFS_MAXREXMIT) 695 nmp->nm_retry = NFS_MAXREXMIT; 696 } 697 698 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 699 700 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 701 nmp->nm_wsize = argp->wsize; 702 /* Round down to multiple of blocksize */ 703 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 704 if (nmp->nm_wsize <= 0) 705 nmp->nm_wsize = NFS_FABLKSIZE; 706 } 707 if (nmp->nm_wsize > maxio) 708 nmp->nm_wsize = maxio; 709 if (nmp->nm_wsize > MAXBSIZE) 710 nmp->nm_wsize = MAXBSIZE; 711 712 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 713 nmp->nm_rsize = argp->rsize; 714 /* Round down to multiple of blocksize */ 715 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 716 if (nmp->nm_rsize <= 0) 717 nmp->nm_rsize = NFS_FABLKSIZE; 718 } 719 if (nmp->nm_rsize > maxio) 720 nmp->nm_rsize = maxio; 721 if (nmp->nm_rsize > MAXBSIZE) 722 nmp->nm_rsize = MAXBSIZE; 723 724 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 725 nmp->nm_readdirsize = argp->readdirsize; 726 } 727 if (nmp->nm_readdirsize > maxio) 728 nmp->nm_readdirsize = maxio; 729 if (nmp->nm_readdirsize > nmp->nm_rsize) 730 nmp->nm_readdirsize = nmp->nm_rsize; 731 732 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 733 nmp->nm_acregmin = argp->acregmin; 734 else 735 nmp->nm_acregmin = NFS_MINATTRTIMO; 736 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 737 nmp->nm_acregmax = argp->acregmax; 738 else 739 nmp->nm_acregmax = NFS_MAXATTRTIMO; 740 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 741 nmp->nm_acdirmin = argp->acdirmin; 742 else 743 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 744 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 745 nmp->nm_acdirmax = argp->acdirmax; 746 else 747 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 748 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 749 nmp->nm_acdirmin = nmp->nm_acdirmax; 750 if (nmp->nm_acregmin > nmp->nm_acregmax) 751 nmp->nm_acregmin = nmp->nm_acregmax; 752 753 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 754 if (argp->maxgrouplist <= NFS_MAXGRPS) 755 nmp->nm_numgrps = argp->maxgrouplist; 756 else 757 nmp->nm_numgrps = NFS_MAXGRPS; 758 } 759 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 760 if (argp->readahead <= NFS_MAXRAHEAD) 761 nmp->nm_readahead = argp->readahead; 762 else 763 nmp->nm_readahead = NFS_MAXRAHEAD; 764 } 765 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 766 if (argp->deadthresh <= NFS_NEVERDEAD) 767 nmp->nm_deadthresh = argp->deadthresh; 768 else 769 nmp->nm_deadthresh = NFS_NEVERDEAD; 770 } 771 772 adjsock |= ((nmp->nm_sotype != argp->sotype) || 773 (nmp->nm_soproto != argp->proto)); 774 nmp->nm_sotype = argp->sotype; 775 nmp->nm_soproto = argp->proto; 776 777 if (nmp->nm_so && adjsock) { 778 nfs_safedisconnect(nmp); 779 if (nmp->nm_sotype == SOCK_DGRAM) 780 while (nfs_connect(nmp, NULL)) { 781 kprintf("nfs_args: retrying connect\n"); 782 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 783 } 784 } 785 } 786 787 /* 788 * VFS Operations. 789 * 790 * mount system call 791 * It seems a bit dumb to copyinstr() the host and path here and then 792 * bcopy() them in mountnfs(), but I wanted to detect errors before 793 * doing the sockargs() call because sockargs() allocates an mbuf and 794 * an error after that means that I have to release the mbuf. 795 */ 796 /* ARGSUSED */ 797 static int 798 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 799 { 800 int error; 801 struct nfs_args args; 802 struct sockaddr *nam; 803 struct vnode *vp; 804 char pth[MNAMELEN], hst[MNAMELEN]; 805 size_t len; 806 u_char nfh[NFSX_V3FHMAX]; 807 808 if (path == NULL) { 809 nfs_mountroot(mp); 810 return (0); 811 } 812 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 813 if (error) 814 return (error); 815 if (args.version != NFS_ARGSVERSION) { 816 #ifdef COMPAT_PRELITE2 817 /* 818 * If the argument version is unknown, then assume the 819 * caller is a pre-lite2 4.4BSD client and convert its 820 * arguments. 821 */ 822 struct onfs_args oargs; 823 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 824 if (error) 825 return (error); 826 nfs_convert_oargs(&args,&oargs); 827 #else /* !COMPAT_PRELITE2 */ 828 return (EPROGMISMATCH); 829 #endif /* COMPAT_PRELITE2 */ 830 } 831 if (mp->mnt_flag & MNT_UPDATE) { 832 struct nfsmount *nmp = VFSTONFS(mp); 833 834 if (nmp == NULL) 835 return (EIO); 836 /* 837 * When doing an update, we can't change from or to 838 * v3, or change cookie translation 839 */ 840 args.flags = (args.flags & 841 ~(NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)) | 842 (nmp->nm_flag & 843 (NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)); 844 nfs_decode_args(nmp, &args); 845 return (0); 846 } 847 848 /* 849 * Make the nfs_ip_paranoia sysctl serve as the default connection 850 * or no-connection mode for those protocols that support 851 * no-connection mode (the flag will be cleared later for protocols 852 * that do not support no-connection mode). This will allow a client 853 * to receive replies from a different IP then the request was 854 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 855 * not 0. 856 */ 857 if (nfs_ip_paranoia == 0) 858 args.flags |= NFSMNT_NOCONN; 859 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 860 return (EINVAL); 861 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 862 if (error) 863 return (error); 864 error = copyinstr(path, pth, MNAMELEN-1, &len); 865 if (error) 866 return (error); 867 bzero(&pth[len], MNAMELEN - len); 868 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 869 if (error) 870 return (error); 871 bzero(&hst[len], MNAMELEN - len); 872 /* sockargs() call must be after above copyin() calls */ 873 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 874 if (error) 875 return (error); 876 args.fh = nfh; 877 error = mountnfs(&args, mp, nam, pth, hst, &vp); 878 return (error); 879 } 880 881 /* 882 * Common code for mount and mountroot 883 */ 884 static int 885 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 886 char *pth, char *hst, struct vnode **vpp) 887 { 888 struct nfsmount *nmp; 889 struct nfsnode *np; 890 int error; 891 892 if (mp->mnt_flag & MNT_UPDATE) { 893 nmp = VFSTONFS(mp); 894 /* update paths, file handles, etc, here XXX */ 895 FREE(nam, M_SONAME); 896 return (0); 897 } else { 898 nmp = zalloc(nfsmount_zone); 899 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 900 TAILQ_INIT(&nmp->nm_uidlruhead); 901 TAILQ_INIT(&nmp->nm_bioq); 902 mp->mnt_data = (qaddr_t)nmp; 903 } 904 vfs_getnewfsid(mp); 905 nmp->nm_mountp = mp; 906 907 /* 908 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 909 * high, depending on whether we end up with negative offsets in 910 * the client or server somewhere. 2GB-1 may be safer. 911 * 912 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 913 * that we can handle until we find out otherwise. 914 * XXX Our "safe" limit on the client is what we can store in our 915 * buffer cache using signed(!) block numbers. 916 */ 917 if ((argp->flags & NFSMNT_NFSV3) == 0) 918 nmp->nm_maxfilesize = 0xffffffffLL; 919 else 920 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 921 922 nmp->nm_timeo = NFS_TIMEO; 923 nmp->nm_retry = NFS_RETRANS; 924 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 925 nmp->nm_rsize = nmp->nm_wsize; 926 nmp->nm_readdirsize = NFS_READDIRSIZE; 927 nmp->nm_numgrps = NFS_MAXGRPS; 928 nmp->nm_readahead = NFS_DEFRAHEAD; 929 nmp->nm_deadthresh = NFS_DEADTHRESH; 930 nmp->nm_fhsize = argp->fhsize; 931 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 932 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 933 nmp->nm_nam = nam; 934 /* Set up the sockets and per-host congestion */ 935 nmp->nm_sotype = argp->sotype; 936 nmp->nm_soproto = argp->proto; 937 nmp->nm_cred = crhold(proc0.p_ucred); 938 939 nfs_decode_args(nmp, argp); 940 941 /* 942 * For Connection based sockets (TCP,...) defer the connect until 943 * the first request, in case the server is not responding. 944 */ 945 if (nmp->nm_sotype == SOCK_DGRAM && 946 (error = nfs_connect(nmp, NULL))) 947 goto bad; 948 949 /* 950 * This is silly, but it has to be set so that vinifod() works. 951 * We do not want to do an nfs_statfs() here since we can get 952 * stuck on a dead server and we are holding a lock on the mount 953 * point. 954 */ 955 mp->mnt_stat.f_iosize = 956 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 957 958 /* 959 * Install vop_ops for our vnops 960 */ 961 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 962 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 963 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 964 965 /* 966 * A reference count is needed on the nfsnode representing the 967 * remote root. If this object is not persistent, then backward 968 * traversals of the mount point (i.e. "..") will not work if 969 * the nfsnode gets flushed out of the cache. Ufs does not have 970 * this problem, because one can identify root inodes by their 971 * number == ROOTINO (2). 972 */ 973 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 974 if (error) 975 goto bad; 976 *vpp = NFSTOV(np); 977 978 /* 979 * Retrieval of mountpoint attributes is delayed until nfs_rot 980 * or nfs_statfs are first called. This will happen either when 981 * we first traverse the mount point or if somebody does a df(1). 982 * 983 * NFSSTA_GOTFSINFO is used to flag if we have successfully 984 * retrieved mountpoint attributes. In the case of NFSv3 we 985 * also flag static fsinfo. 986 */ 987 if (*vpp != NULL) 988 (*vpp)->v_type = VNON; 989 990 /* 991 * Lose the lock but keep the ref. 992 */ 993 vn_unlock(*vpp); 994 995 return (0); 996 bad: 997 nfs_disconnect(nmp); 998 nfs_free_mount(nmp); 999 FREE(nam, M_SONAME); 1000 return (error); 1001 } 1002 1003 /* 1004 * unmount system call 1005 */ 1006 static int 1007 nfs_unmount(struct mount *mp, int mntflags) 1008 { 1009 struct nfsmount *nmp; 1010 int error, flags = 0; 1011 1012 if (mntflags & MNT_FORCE) 1013 flags |= FORCECLOSE; 1014 nmp = VFSTONFS(mp); 1015 /* 1016 * Goes something like this.. 1017 * - Call vflush() to clear out vnodes for this file system 1018 * - Close the socket 1019 * - Free up the data structures 1020 */ 1021 /* In the forced case, cancel any outstanding requests. */ 1022 if (flags & FORCECLOSE) { 1023 error = nfs_nmcancelreqs(nmp); 1024 if (error) 1025 return (error); 1026 } 1027 /* 1028 * Must handshake with nfs_clientd() if it is active. XXX 1029 */ 1030 nmp->nm_state |= NFSSTA_DISMINPROG; 1031 1032 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1033 error = vflush(mp, 1, flags); 1034 if (error) { 1035 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1036 return (error); 1037 } 1038 1039 /* 1040 * We are now committed to the unmount. 1041 * For NQNFS, let the server daemon free the nfsmount structure. 1042 */ 1043 if (nmp->nm_flag & NFSMNT_KERB) 1044 nmp->nm_state |= NFSSTA_DISMNT; 1045 1046 nfs_disconnect(nmp); 1047 FREE(nmp->nm_nam, M_SONAME); 1048 1049 if ((nmp->nm_flag & NFSMNT_KERB) == 0) 1050 nfs_free_mount(nmp); 1051 return (0); 1052 } 1053 1054 void 1055 nfs_free_mount(struct nfsmount *nmp) 1056 { 1057 if (nmp->nm_cred) { 1058 crfree(nmp->nm_cred); 1059 nmp->nm_cred = NULL; 1060 } 1061 zfree(nfsmount_zone, nmp); 1062 } 1063 1064 /* 1065 * Return root of a filesystem 1066 */ 1067 static int 1068 nfs_root(struct mount *mp, struct vnode **vpp) 1069 { 1070 struct vnode *vp; 1071 struct nfsmount *nmp; 1072 struct vattr attrs; 1073 struct nfsnode *np; 1074 int error; 1075 1076 nmp = VFSTONFS(mp); 1077 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1078 if (error) 1079 return (error); 1080 vp = NFSTOV(np); 1081 1082 /* 1083 * Get transfer parameters and root vnode attributes 1084 */ 1085 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1086 if (nmp->nm_flag & NFSMNT_NFSV3) { 1087 error = nfs_fsinfo(nmp, vp, curthread); 1088 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1089 } else { 1090 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1091 nmp->nm_state |= NFSSTA_GOTFSINFO; 1092 1093 } 1094 } else { 1095 /* 1096 * The root vnode is usually cached by the namecache so do not 1097 * try to avoid going over the wire even if we have previous 1098 * information cached. A stale NFS mount can loop 1099 * forever resolving the root vnode if we return no-error when 1100 * there is in fact an error. 1101 */ 1102 np->n_attrstamp = 0; 1103 error = VOP_GETATTR(vp, &attrs); 1104 } 1105 if (vp->v_type == VNON) 1106 nfs_setvtype(vp, VDIR); 1107 vp->v_flag = VROOT; 1108 if (error) 1109 vput(vp); 1110 else 1111 *vpp = vp; 1112 return (error); 1113 } 1114 1115 extern int syncprt; 1116 1117 struct scaninfo { 1118 int rescan; 1119 int waitfor; 1120 int allerror; 1121 }; 1122 1123 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1124 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1125 1126 /* 1127 * Flush out the buffer cache 1128 */ 1129 /* ARGSUSED */ 1130 static int 1131 nfs_sync(struct mount *mp, int waitfor) 1132 { 1133 struct scaninfo scaninfo; 1134 int error; 1135 1136 scaninfo.rescan = 1; 1137 scaninfo.waitfor = waitfor; 1138 scaninfo.allerror = 0; 1139 1140 /* 1141 * Force stale buffer cache information to be flushed. 1142 */ 1143 error = 0; 1144 while (error == 0 && scaninfo.rescan) { 1145 scaninfo.rescan = 0; 1146 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1147 nfs_sync_scan2, &scaninfo); 1148 } 1149 return(error); 1150 } 1151 1152 static int 1153 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1154 { 1155 struct scaninfo *info = data; 1156 1157 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree)) 1158 return(-1); 1159 if (info->waitfor == MNT_LAZY) 1160 return(-1); 1161 return(0); 1162 } 1163 1164 static 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); 1171 if (error) 1172 info->allerror = error; 1173 return(0); 1174 } 1175 1176