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 1.28 2005/07/26 15:43:35 hmp Exp $ 39 */ 40 41 #include "opt_bootp.h" 42 43 #include <sys/param.h> 44 #include <sys/sockio.h> 45 #include <sys/proc.h> 46 #include <sys/vnode.h> 47 #include <sys/kernel.h> 48 #include <sys/sysctl.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/mbuf.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/systm.h> 55 56 #include <vm/vm.h> 57 #include <vm/vm_extern.h> 58 #include <vm/vm_zone.h> 59 60 #include <net/if.h> 61 #include <net/route.h> 62 #include <netinet/in.h> 63 64 #include <sys/thread2.h> 65 66 #include "rpcv2.h" 67 #include "nfsproto.h" 68 #include "nfs.h" 69 #include "nfsmount.h" 70 #include "nfsnode.h" 71 #include "xdr_subs.h" 72 #include "nfsm_subs.h" 73 #include "nfsdiskless.h" 74 #include "nqnfs.h" 75 76 extern int nfs_mountroot(struct mount *mp); 77 extern void bootpc_init(void); 78 79 extern int nfs_ticks; 80 extern struct vnodeopv_entry_desc nfsv2_vnodeop_entries[]; 81 extern struct vnodeopv_entry_desc nfsv2_fifoop_entries[]; 82 extern struct vnodeopv_entry_desc nfsv2_specop_entries[]; 83 84 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 85 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 86 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 87 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 88 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 89 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 90 MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease"); 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->leaseterm = oargs->leaseterm; 244 args->deadthresh = oargs->deadthresh; 245 args->hostname = oargs->hostname; 246 } 247 248 static void 249 nfs_convert_diskless() 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 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 257 bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH); 258 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 259 sizeof(struct sockaddr_in)); 260 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 261 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 262 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 263 sizeof(struct ucred)); 264 nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args); 265 nfsv3_diskless.root_fhsize = NFSX_V2FH; 266 bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH); 267 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 268 sizeof(struct sockaddr_in)); 269 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 270 nfsv3_diskless.root_time = nfs_diskless.root_time; 271 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 272 MAXHOSTNAMELEN); 273 nfs_diskless_valid = 3; 274 } 275 276 /* 277 * nfs statfs call 278 */ 279 int 280 nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 281 { 282 struct vnode *vp; 283 struct nfs_statfs *sfp; 284 caddr_t cp; 285 u_int32_t *tl; 286 int32_t t1, t2; 287 caddr_t bpos, dpos, cp2; 288 struct nfsmount *nmp = VFSTONFS(mp); 289 int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr; 290 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 291 struct ucred *cred; 292 struct nfsnode *np; 293 u_quad_t tquad; 294 295 #ifndef nolint 296 sfp = (struct nfs_statfs *)0; 297 #endif 298 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 299 if (error) 300 return (error); 301 vp = NFSTOV(np); 302 cred = crget(); 303 cred->cr_ngroups = 1; 304 if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 305 (void)nfs_fsinfo(nmp, vp, td); 306 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 307 nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3)); 308 nfsm_fhtom(vp, v3); 309 nfsm_request(vp, NFSPROC_FSSTAT, td, cred); 310 if (v3) 311 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 312 if (error) { 313 if (mrep != NULL) 314 m_freem(mrep); 315 goto nfsmout; 316 } 317 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3)); 318 sbp->f_flags = nmp->nm_flag; 319 sbp->f_iosize = nfs_iosize(v3, nmp->nm_sotype); 320 321 if (v3) { 322 sbp->f_bsize = NFS_FABLKSIZE; 323 tquad = fxdr_hyper(&sfp->sf_tbytes); 324 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 325 tquad = fxdr_hyper(&sfp->sf_fbytes); 326 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 327 tquad = fxdr_hyper(&sfp->sf_abytes); 328 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 329 sbp->f_files = (fxdr_unsigned(int32_t, 330 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 331 sbp->f_ffree = (fxdr_unsigned(int32_t, 332 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 333 } else { 334 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 335 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 336 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 337 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 338 sbp->f_files = 0; 339 sbp->f_ffree = 0; 340 } 341 if (sbp != &mp->mnt_stat) { 342 sbp->f_type = mp->mnt_vfc->vfc_typenum; 343 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 344 } 345 m_freem(mrep); 346 nfsmout: 347 vput(vp); 348 crfree(cred); 349 return (error); 350 } 351 352 /* 353 * nfs version 3 fsinfo rpc call 354 */ 355 int 356 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 357 { 358 struct nfsv3_fsinfo *fsp; 359 caddr_t cp; 360 int32_t t1, t2; 361 u_int32_t *tl, pref, max; 362 caddr_t bpos, dpos, cp2; 363 int error = 0, retattr; 364 struct mbuf *mreq, *mrep, *md, *mb, *mb2; 365 u_int64_t maxfsize; 366 367 nfsstats.rpccnt[NFSPROC_FSINFO]++; 368 nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1)); 369 nfsm_fhtom(vp, 1); 370 nfsm_request(vp, NFSPROC_FSINFO, td, nfs_vpcred(vp, ND_READ)); 371 nfsm_postop_attr(vp, retattr, NFS_LATTR_NOSHRINK); 372 if (!error) { 373 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 374 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 375 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 376 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 377 ~(NFS_FABLKSIZE - 1); 378 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 379 if (max < nmp->nm_wsize && max > 0) { 380 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 381 if (nmp->nm_wsize == 0) 382 nmp->nm_wsize = max; 383 } 384 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 385 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 386 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 387 ~(NFS_FABLKSIZE - 1); 388 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 389 if (max < nmp->nm_rsize && max > 0) { 390 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 391 if (nmp->nm_rsize == 0) 392 nmp->nm_rsize = max; 393 } 394 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 395 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 396 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 397 ~(NFS_DIRBLKSIZ - 1); 398 if (max < nmp->nm_readdirsize && max > 0) { 399 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 400 if (nmp->nm_readdirsize == 0) 401 nmp->nm_readdirsize = max; 402 } 403 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 404 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 405 nmp->nm_maxfilesize = maxfsize; 406 nmp->nm_state |= NFSSTA_GOTFSINFO; 407 } 408 m_freem(mrep); 409 nfsmout: 410 return (error); 411 } 412 413 /* 414 * Mount a remote root fs via. nfs. This depends on the info in the 415 * nfs_diskless structure that has been filled in properly by some primary 416 * bootstrap. 417 * It goes something like this: 418 * - do enough of "ifconfig" by calling ifioctl() so that the system 419 * can talk to the server 420 * - If nfs_diskless.mygateway is filled in, use that address as 421 * a default gateway. 422 * - build the rootfs mount point and call mountnfs() to do the rest. 423 */ 424 int 425 nfs_mountroot(mp) 426 struct mount *mp; 427 { 428 struct mount *swap_mp; 429 struct nfsv3_diskless *nd = &nfsv3_diskless; 430 struct socket *so; 431 struct vnode *vp; 432 struct thread *td = curthread; /* XXX */ 433 int error, i; 434 u_long l; 435 char buf[128]; 436 437 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 438 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 439 #endif 440 441 /* 442 * XXX time must be non-zero when we init the interface or else 443 * the arp code will wedge... 444 */ 445 while (mycpu->gd_time_seconds == 0) 446 tsleep(mycpu, 0, "arpkludge", 10); 447 448 if (nfs_diskless_valid==1) 449 nfs_convert_diskless(); 450 451 /* 452 * XXX splnet, so networks will receive... 453 */ 454 crit_enter(); 455 456 #ifdef notyet 457 /* Set up swap credentials. */ 458 proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid); 459 proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid); 460 if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) > 461 NGROUPS) 462 proc0.p_ucred->cr_ngroups = NGROUPS; 463 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 464 proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]); 465 #endif 466 467 /* 468 * Do enough of ifconfig(8) so that the critical net interface can 469 * talk to the server. 470 */ 471 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 472 if (error) 473 panic("nfs_mountroot: socreate(%04x): %d", 474 nd->myif.ifra_addr.sa_family, error); 475 476 #if 0 /* XXX Bad idea */ 477 /* 478 * We might not have been told the right interface, so we pass 479 * over the first ten interfaces of the same kind, until we get 480 * one of them configured. 481 */ 482 483 for (i = strlen(nd->myif.ifra_name) - 1; 484 nd->myif.ifra_name[i] >= '0' && 485 nd->myif.ifra_name[i] <= '9'; 486 nd->myif.ifra_name[i] ++) { 487 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 488 if(!error) 489 break; 490 } 491 #endif 492 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td); 493 if (error) 494 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 495 soclose(so); 496 497 /* 498 * If the gateway field is filled in, set it as the default route. 499 */ 500 if (nd->mygateway.sin_len != 0) { 501 struct sockaddr_in mask, sin; 502 503 bzero((caddr_t)&mask, sizeof(mask)); 504 sin = mask; 505 sin.sin_family = AF_INET; 506 sin.sin_len = sizeof(sin); 507 error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, 508 (struct sockaddr *)&nd->mygateway, 509 (struct sockaddr *)&mask, 510 RTF_UP | RTF_GATEWAY, (struct rtentry **)0); 511 if (error) 512 panic("nfs_mountroot: RTM_ADD: %d", error); 513 } 514 515 /* 516 * Create the rootfs mount point. 517 */ 518 nd->root_args.fh = nd->root_fh; 519 nd->root_args.fhsize = nd->root_fhsize; 520 l = ntohl(nd->root_saddr.sin_addr.s_addr); 521 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 522 (l >> 24) & 0xff, (l >> 16) & 0xff, 523 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 524 printf("NFS ROOT: %s\n",buf); 525 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 526 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 527 if (swap_mp) { 528 mp->mnt_vfc->vfc_refcount--; 529 free(swap_mp, M_MOUNT); 530 } 531 return (error); 532 } 533 534 swap_mp = NULL; 535 if (nd->swap_nblks) { 536 537 /* Convert to DEV_BSIZE instead of Kilobyte */ 538 nd->swap_nblks *= 2; 539 540 /* 541 * Create a fake mount point just for the swap vnode so that the 542 * swap file can be on a different server from the rootfs. 543 */ 544 nd->swap_args.fh = nd->swap_fh; 545 nd->swap_args.fhsize = nd->swap_fhsize; 546 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 547 snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 548 (l >> 24) & 0xff, (l >> 16) & 0xff, 549 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 550 printf("NFS SWAP: %s\n",buf); 551 if ((error = nfs_mountdiskless(buf, "/swap", 0, 552 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) 553 return (error); 554 vfs_unbusy(swap_mp, td); 555 556 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 557 nd->swap_nblks * DEV_BSIZE ; 558 559 /* 560 * Since the swap file is not the root dir of a file system, 561 * hack it to a regular file. 562 */ 563 vp->v_type = VREG; 564 vp->v_flag = 0; 565 vref(vp); 566 swaponvp(td, vp, nd->swap_nblks); 567 } 568 569 mp->mnt_flag |= MNT_ROOTFS; 570 mp->mnt_vnodecovered = NULLVP; 571 vfs_unbusy(mp, td); 572 573 /* 574 * This is not really an nfs issue, but it is much easier to 575 * set hostname here and then let the "/etc/rc.xxx" files 576 * mount the right /var based upon its preset value. 577 */ 578 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 579 hostname[MAXHOSTNAMELEN - 1] = '\0'; 580 for (i = 0; i < MAXHOSTNAMELEN; i++) 581 if (hostname[i] == '\0') 582 break; 583 inittodr(ntohl(nd->root_time)); 584 return (0); 585 } 586 587 /* 588 * Internal version of mount system call for diskless setup. 589 */ 590 static int 591 nfs_mountdiskless(char *path, char *which, int mountflag, 592 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 593 struct vnode **vpp, struct mount **mpp) 594 { 595 struct mount *mp; 596 struct sockaddr *nam; 597 int error; 598 int didalloc = 0; 599 600 mp = *mpp; 601 602 if (mp == NULL) { 603 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 604 printf("nfs_mountroot: NFS not configured"); 605 return (error); 606 } 607 didalloc = 1; 608 } 609 610 mp->mnt_kern_flag = 0; 611 mp->mnt_flag = mountflag; 612 nam = dup_sockaddr((struct sockaddr *)sin); 613 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 614 printf("nfs_mountroot: mount %s on %s: %d", path, which, error); 615 mp->mnt_vfc->vfc_refcount--; 616 vfs_unbusy(mp, td); 617 if (didalloc) 618 free(mp, M_MOUNT); 619 FREE(nam, M_SONAME); 620 return (error); 621 } 622 *mpp = mp; 623 return (0); 624 } 625 626 static void 627 nfs_decode_args(nmp, argp) 628 struct nfsmount *nmp; 629 struct nfs_args *argp; 630 { 631 int adjsock; 632 int maxio; 633 634 crit_enter(); 635 /* 636 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 637 * no sense in that context. 638 */ 639 if (argp->sotype == SOCK_STREAM) 640 nmp->nm_flag &= ~NFSMNT_NOCONN; 641 642 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 643 if ((argp->flags & NFSMNT_NFSV3) == 0) 644 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 645 646 /* Re-bind if rsrvd port requested and wasn't on one */ 647 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 648 && (argp->flags & NFSMNT_RESVPORT); 649 /* Also re-bind if we're switching to/from a connected UDP socket */ 650 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 651 (argp->flags & NFSMNT_NOCONN)); 652 653 /* Update flags atomically. Don't change the lock bits. */ 654 nmp->nm_flag = argp->flags | nmp->nm_flag; 655 crit_exit(); 656 657 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 658 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 659 if (nmp->nm_timeo < NFS_MINTIMEO) 660 nmp->nm_timeo = NFS_MINTIMEO; 661 else if (nmp->nm_timeo > NFS_MAXTIMEO) 662 nmp->nm_timeo = NFS_MAXTIMEO; 663 } 664 665 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 666 nmp->nm_retry = argp->retrans; 667 if (nmp->nm_retry > NFS_MAXREXMIT) 668 nmp->nm_retry = NFS_MAXREXMIT; 669 } 670 671 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 672 673 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 674 nmp->nm_wsize = argp->wsize; 675 /* Round down to multiple of blocksize */ 676 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 677 if (nmp->nm_wsize <= 0) 678 nmp->nm_wsize = NFS_FABLKSIZE; 679 } 680 if (nmp->nm_wsize > maxio) 681 nmp->nm_wsize = maxio; 682 if (nmp->nm_wsize > MAXBSIZE) 683 nmp->nm_wsize = MAXBSIZE; 684 685 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 686 nmp->nm_rsize = argp->rsize; 687 /* Round down to multiple of blocksize */ 688 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 689 if (nmp->nm_rsize <= 0) 690 nmp->nm_rsize = NFS_FABLKSIZE; 691 } 692 if (nmp->nm_rsize > maxio) 693 nmp->nm_rsize = maxio; 694 if (nmp->nm_rsize > MAXBSIZE) 695 nmp->nm_rsize = MAXBSIZE; 696 697 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 698 nmp->nm_readdirsize = argp->readdirsize; 699 } 700 if (nmp->nm_readdirsize > maxio) 701 nmp->nm_readdirsize = maxio; 702 if (nmp->nm_readdirsize > nmp->nm_rsize) 703 nmp->nm_readdirsize = nmp->nm_rsize; 704 705 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 706 nmp->nm_acregmin = argp->acregmin; 707 else 708 nmp->nm_acregmin = NFS_MINATTRTIMO; 709 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 710 nmp->nm_acregmax = argp->acregmax; 711 else 712 nmp->nm_acregmax = NFS_MAXATTRTIMO; 713 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 714 nmp->nm_acdirmin = argp->acdirmin; 715 else 716 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 717 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 718 nmp->nm_acdirmax = argp->acdirmax; 719 else 720 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 721 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 722 nmp->nm_acdirmin = nmp->nm_acdirmax; 723 if (nmp->nm_acregmin > nmp->nm_acregmax) 724 nmp->nm_acregmin = nmp->nm_acregmax; 725 726 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 727 if (argp->maxgrouplist <= NFS_MAXGRPS) 728 nmp->nm_numgrps = argp->maxgrouplist; 729 else 730 nmp->nm_numgrps = NFS_MAXGRPS; 731 } 732 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 733 if (argp->readahead <= NFS_MAXRAHEAD) 734 nmp->nm_readahead = argp->readahead; 735 else 736 nmp->nm_readahead = NFS_MAXRAHEAD; 737 } 738 if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2) { 739 if (argp->leaseterm <= NQ_MAXLEASE) 740 nmp->nm_leaseterm = argp->leaseterm; 741 else 742 nmp->nm_leaseterm = NQ_MAXLEASE; 743 } 744 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 745 if (argp->deadthresh <= NQ_NEVERDEAD) 746 nmp->nm_deadthresh = argp->deadthresh; 747 else 748 nmp->nm_deadthresh = NQ_NEVERDEAD; 749 } 750 751 adjsock |= ((nmp->nm_sotype != argp->sotype) || 752 (nmp->nm_soproto != argp->proto)); 753 nmp->nm_sotype = argp->sotype; 754 nmp->nm_soproto = argp->proto; 755 756 if (nmp->nm_so && adjsock) { 757 nfs_safedisconnect(nmp); 758 if (nmp->nm_sotype == SOCK_DGRAM) 759 while (nfs_connect(nmp, (struct nfsreq *)0)) { 760 printf("nfs_args: retrying connect\n"); 761 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 762 } 763 } 764 } 765 766 /* 767 * VFS Operations. 768 * 769 * mount system call 770 * It seems a bit dumb to copyinstr() the host and path here and then 771 * bcopy() them in mountnfs(), but I wanted to detect errors before 772 * doing the sockargs() call because sockargs() allocates an mbuf and 773 * an error after that means that I have to release the mbuf. 774 */ 775 /* ARGSUSED */ 776 static int 777 nfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td) 778 { 779 int error; 780 struct nfs_args args; 781 struct sockaddr *nam; 782 struct vnode *vp; 783 char pth[MNAMELEN], hst[MNAMELEN]; 784 size_t len; 785 u_char nfh[NFSX_V3FHMAX]; 786 787 if (path == NULL) { 788 nfs_mountroot(mp); 789 return (0); 790 } 791 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 792 if (error) 793 return (error); 794 if (args.version != NFS_ARGSVERSION) { 795 #ifdef COMPAT_PRELITE2 796 /* 797 * If the argument version is unknown, then assume the 798 * caller is a pre-lite2 4.4BSD client and convert its 799 * arguments. 800 */ 801 struct onfs_args oargs; 802 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 803 if (error) 804 return (error); 805 nfs_convert_oargs(&args,&oargs); 806 #else /* !COMPAT_PRELITE2 */ 807 return (EPROGMISMATCH); 808 #endif /* COMPAT_PRELITE2 */ 809 } 810 if (mp->mnt_flag & MNT_UPDATE) { 811 struct nfsmount *nmp = VFSTONFS(mp); 812 813 if (nmp == NULL) 814 return (EIO); 815 /* 816 * When doing an update, we can't change from or to 817 * v3 and/or nqnfs, or change cookie translation 818 */ 819 args.flags = (args.flags & 820 ~(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)) | 821 (nmp->nm_flag & 822 (NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)); 823 nfs_decode_args(nmp, &args); 824 return (0); 825 } 826 827 /* 828 * Make the nfs_ip_paranoia sysctl serve as the default connection 829 * or no-connection mode for those protocols that support 830 * no-connection mode (the flag will be cleared later for protocols 831 * that do not support no-connection mode). This will allow a client 832 * to receive replies from a different IP then the request was 833 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 834 * not 0. 835 */ 836 if (nfs_ip_paranoia == 0) 837 args.flags |= NFSMNT_NOCONN; 838 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 839 return (EINVAL); 840 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 841 if (error) 842 return (error); 843 error = copyinstr(path, pth, MNAMELEN-1, &len); 844 if (error) 845 return (error); 846 bzero(&pth[len], MNAMELEN - len); 847 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 848 if (error) 849 return (error); 850 bzero(&hst[len], MNAMELEN - len); 851 /* sockargs() call must be after above copyin() calls */ 852 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 853 if (error) 854 return (error); 855 args.fh = nfh; 856 error = mountnfs(&args, mp, nam, pth, hst, &vp); 857 return (error); 858 } 859 860 /* 861 * Common code for mount and mountroot 862 */ 863 static int 864 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 865 char *pth, char *hst, struct vnode **vpp) 866 { 867 struct nfsmount *nmp; 868 struct nfsnode *np; 869 int error; 870 871 if (mp->mnt_flag & MNT_UPDATE) { 872 nmp = VFSTONFS(mp); 873 /* update paths, file handles, etc, here XXX */ 874 FREE(nam, M_SONAME); 875 return (0); 876 } else { 877 nmp = zalloc(nfsmount_zone); 878 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 879 TAILQ_INIT(&nmp->nm_uidlruhead); 880 TAILQ_INIT(&nmp->nm_bufq); 881 mp->mnt_data = (qaddr_t)nmp; 882 } 883 vfs_getnewfsid(mp); 884 nmp->nm_mountp = mp; 885 if (argp->flags & NFSMNT_NQNFS) 886 /* 887 * We have to set mnt_maxsymlink to a non-zero value so 888 * that COMPAT_43 routines will know that we are setting 889 * the d_type field in directories (and can zero it for 890 * unsuspecting binaries). 891 */ 892 mp->mnt_maxsymlinklen = 1; 893 894 /* 895 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 896 * high, depending on whether we end up with negative offsets in 897 * the client or server somewhere. 2GB-1 may be safer. 898 * 899 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 900 * that we can handle until we find out otherwise. 901 * XXX Our "safe" limit on the client is what we can store in our 902 * buffer cache using signed(!) block numbers. 903 */ 904 if ((argp->flags & NFSMNT_NFSV3) == 0) 905 nmp->nm_maxfilesize = 0xffffffffLL; 906 else 907 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 908 909 nmp->nm_timeo = NFS_TIMEO; 910 nmp->nm_retry = NFS_RETRANS; 911 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 912 nmp->nm_rsize = nmp->nm_wsize; 913 nmp->nm_readdirsize = NFS_READDIRSIZE; 914 nmp->nm_numgrps = NFS_MAXGRPS; 915 nmp->nm_readahead = NFS_DEFRAHEAD; 916 nmp->nm_leaseterm = NQ_DEFLEASE; 917 nmp->nm_deadthresh = NQ_DEADTHRESH; 918 CIRCLEQ_INIT(&nmp->nm_timerhead); 919 nmp->nm_inprog = NULLVP; 920 nmp->nm_fhsize = argp->fhsize; 921 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 922 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 923 nmp->nm_nam = nam; 924 /* Set up the sockets and per-host congestion */ 925 nmp->nm_sotype = argp->sotype; 926 nmp->nm_soproto = argp->proto; 927 nmp->nm_cred = crhold(proc0.p_ucred); 928 929 nfs_decode_args(nmp, argp); 930 931 /* 932 * For Connection based sockets (TCP,...) defer the connect until 933 * the first request, in case the server is not responding. 934 */ 935 if (nmp->nm_sotype == SOCK_DGRAM && 936 (error = nfs_connect(nmp, (struct nfsreq *)0))) 937 goto bad; 938 939 /* 940 * This is silly, but it has to be set so that vinifod() works. 941 * We do not want to do an nfs_statfs() here since we can get 942 * stuck on a dead server and we are holding a lock on the mount 943 * point. 944 */ 945 mp->mnt_stat.f_iosize = 946 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 947 948 /* 949 * Install vop_ops for our vnops 950 */ 951 vfs_add_vnodeops(mp, &mp->mnt_vn_norm_ops, nfsv2_vnodeop_entries); 952 vfs_add_vnodeops(mp, &mp->mnt_vn_spec_ops, nfsv2_specop_entries); 953 vfs_add_vnodeops(mp, &mp->mnt_vn_fifo_ops, nfsv2_fifoop_entries); 954 955 /* 956 * A reference count is needed on the nfsnode representing the 957 * remote root. If this object is not persistent, then backward 958 * traversals of the mount point (i.e. "..") will not work if 959 * the nfsnode gets flushed out of the cache. Ufs does not have 960 * this problem, because one can identify root inodes by their 961 * number == ROOTINO (2). 962 */ 963 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 964 if (error) 965 goto bad; 966 *vpp = NFSTOV(np); 967 968 /* 969 * Retrieval of mountpoint attributes is delayed until nfs_rot 970 * or nfs_statfs are first called. This will happen either when 971 * we first traverse the mount point or if somebody does a df(1). 972 * 973 * NFSSTA_GOTFSINFO is used to flag if we have successfully 974 * retrieved mountpoint attributes. In the case of NFSv3 we 975 * also flag static fsinfo. 976 */ 977 if (*vpp != NULL) 978 (*vpp)->v_type = VNON; 979 980 /* 981 * Lose the lock but keep the ref. 982 */ 983 VOP_UNLOCK(*vpp, 0, curthread); 984 985 return (0); 986 bad: 987 nfs_disconnect(nmp); 988 nfs_free_mount(nmp); 989 FREE(nam, M_SONAME); 990 return (error); 991 } 992 993 /* 994 * unmount system call 995 */ 996 static int 997 nfs_unmount(struct mount *mp, int mntflags, struct thread *td) 998 { 999 struct nfsmount *nmp; 1000 int error, flags = 0; 1001 1002 if (mntflags & MNT_FORCE) 1003 flags |= FORCECLOSE; 1004 nmp = VFSTONFS(mp); 1005 /* 1006 * Goes something like this.. 1007 * - Call vflush() to clear out vnodes for this file system 1008 * - Close the socket 1009 * - Free up the data structures 1010 */ 1011 /* In the forced case, cancel any outstanding requests. */ 1012 if (flags & FORCECLOSE) { 1013 error = nfs_nmcancelreqs(nmp); 1014 if (error) 1015 return (error); 1016 } 1017 /* 1018 * Must handshake with nqnfs_clientd() if it is active. 1019 */ 1020 nmp->nm_state |= NFSSTA_DISMINPROG; 1021 while (nmp->nm_inprog != NULLVP) 1022 (void) tsleep((caddr_t)&lbolt, 0, "nfsdism", 0); 1023 1024 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1025 error = vflush(mp, 1, flags); 1026 if (error) { 1027 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1028 return (error); 1029 } 1030 1031 /* 1032 * We are now committed to the unmount. 1033 * For NQNFS, let the server daemon free the nfsmount structure. 1034 */ 1035 if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) 1036 nmp->nm_state |= NFSSTA_DISMNT; 1037 1038 nfs_disconnect(nmp); 1039 FREE(nmp->nm_nam, M_SONAME); 1040 1041 if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0) 1042 nfs_free_mount(nmp); 1043 return (0); 1044 } 1045 1046 void 1047 nfs_free_mount(struct nfsmount *nmp) 1048 { 1049 if (nmp->nm_cred) { 1050 crfree(nmp->nm_cred); 1051 nmp->nm_cred = NULL; 1052 } 1053 zfree(nfsmount_zone, nmp); 1054 } 1055 1056 /* 1057 * Return root of a filesystem 1058 */ 1059 static int 1060 nfs_root(mp, vpp) 1061 struct mount *mp; 1062 struct vnode **vpp; 1063 { 1064 struct vnode *vp; 1065 struct nfsmount *nmp; 1066 struct vattr attrs; 1067 struct nfsnode *np; 1068 int error; 1069 1070 nmp = VFSTONFS(mp); 1071 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1072 if (error) 1073 return (error); 1074 vp = NFSTOV(np); 1075 1076 /* 1077 * Get transfer parameters and root vnode attributes 1078 */ 1079 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1080 if (nmp->nm_flag & NFSMNT_NFSV3) { 1081 nfs_fsinfo(nmp, vp, curthread); 1082 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1083 } else { 1084 if ((error = VOP_GETATTR(vp, &attrs, curthread)) == 0) 1085 nmp->nm_state |= NFSSTA_GOTFSINFO; 1086 1087 } 1088 } 1089 if (vp->v_type == VNON) 1090 vp->v_type = VDIR; 1091 vp->v_flag = VROOT; 1092 *vpp = vp; 1093 return (0); 1094 } 1095 1096 extern int syncprt; 1097 1098 struct scaninfo { 1099 int rescan; 1100 thread_t td; 1101 int waitfor; 1102 int allerror; 1103 }; 1104 1105 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1106 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1107 1108 /* 1109 * Flush out the buffer cache 1110 */ 1111 /* ARGSUSED */ 1112 static int 1113 nfs_sync(struct mount *mp, int waitfor, struct thread *td) 1114 { 1115 struct scaninfo scaninfo; 1116 int error; 1117 1118 scaninfo.rescan = 0; 1119 scaninfo.td = td; 1120 scaninfo.waitfor = waitfor; 1121 scaninfo.allerror = 0; 1122 1123 /* 1124 * Force stale buffer cache information to be flushed. 1125 */ 1126 error = 0; 1127 while (error == 0 && scaninfo.rescan) { 1128 scaninfo.rescan = 0; 1129 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1130 nfs_sync_scan2, &scaninfo); 1131 } 1132 return(error); 1133 } 1134 1135 static 1136 int 1137 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1138 { 1139 struct scaninfo *info = data; 1140 1141 if (VOP_ISLOCKED(vp, NULL) || RB_EMPTY(&vp->v_rbdirty_tree)) 1142 return(-1); 1143 if (info->waitfor == MNT_LAZY) 1144 return(-1); 1145 return(0); 1146 } 1147 1148 static 1149 int 1150 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1151 { 1152 struct scaninfo *info = data; 1153 int error; 1154 1155 error = VOP_FSYNC(vp, info->waitfor, info->td); 1156 if (error) 1157 info->allerror = error; 1158 return(0); 1159 } 1160 1161