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 #include <sys/mutex2.h> 68 69 #include "rpcv2.h" 70 #include "nfsproto.h" 71 #include "nfs.h" 72 #include "nfsmount.h" 73 #include "nfsnode.h" 74 #include "xdr_subs.h" 75 #include "nfsm_subs.h" 76 #include "nfsdiskless.h" 77 #include "nfsmountrpc.h" 78 79 extern int nfs_mountroot(struct mount *mp); 80 extern void bootpc_init(void); 81 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 struct nfsmount *nmp = VFSTONFS(mp); 298 thread_t td = curthread; 299 int error = 0, retattr; 300 struct nfsnode *np; 301 u_quad_t tquad; 302 struct nfsm_info info; 303 304 info.mrep = NULL; 305 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 306 307 #ifndef nolint 308 sfp = NULL; 309 #endif 310 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 311 if (error) 312 return (error); 313 vp = NFSTOV(np); 314 /* ignore the passed cred */ 315 cred = crget(); 316 cred->cr_ngroups = 1; 317 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 318 (void)nfs_fsinfo(nmp, vp, td); 319 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 320 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 321 ERROROUT(nfsm_fhtom(&info, vp)); 322 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 323 if (info.v3) { 324 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 325 NFS_LATTR_NOSHRINK)); 326 } 327 if (error) { 328 if (info.mrep != NULL) 329 m_freem(info.mrep); 330 goto nfsmout; 331 } 332 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 333 sbp->f_flags = nmp->nm_flag; 334 sbp->f_iosize = nfs_iosize(info.v3, nmp->nm_sotype); 335 336 if (info.v3) { 337 sbp->f_bsize = NFS_FABLKSIZE; 338 tquad = fxdr_hyper(&sfp->sf_tbytes); 339 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 340 tquad = fxdr_hyper(&sfp->sf_fbytes); 341 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 342 tquad = fxdr_hyper(&sfp->sf_abytes); 343 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 344 sbp->f_files = (fxdr_unsigned(int32_t, 345 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 346 sbp->f_ffree = (fxdr_unsigned(int32_t, 347 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 348 } else { 349 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 350 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 351 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 352 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 353 sbp->f_files = 0; 354 sbp->f_ffree = 0; 355 } 356 if (sbp != &mp->mnt_stat) { 357 sbp->f_type = mp->mnt_vfc->vfc_typenum; 358 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 359 } 360 m_freem(info.mrep); 361 info.mrep = NULL; 362 nfsmout: 363 vput(vp); 364 crfree(cred); 365 return (error); 366 } 367 368 /* 369 * nfs version 3 fsinfo rpc call 370 */ 371 int 372 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 373 { 374 struct nfsv3_fsinfo *fsp; 375 u_int32_t pref, max; 376 int error = 0, retattr; 377 u_int64_t maxfsize; 378 struct nfsm_info info; 379 380 info.v3 = 1; 381 nfsstats.rpccnt[NFSPROC_FSINFO]++; 382 nfsm_reqhead(&info, vp, NFSPROC_FSINFO, NFSX_FH(1)); 383 ERROROUT(nfsm_fhtom(&info, vp)); 384 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSINFO, td, 385 nfs_vpcred(vp, ND_READ), &error)); 386 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, NFS_LATTR_NOSHRINK)); 387 if (error == 0) { 388 NULLOUT(fsp = nfsm_dissect(&info, NFSX_V3FSINFO)); 389 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 390 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 391 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 392 ~(NFS_FABLKSIZE - 1); 393 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 394 if (max < nmp->nm_wsize && max > 0) { 395 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 396 if (nmp->nm_wsize == 0) 397 nmp->nm_wsize = max; 398 } 399 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 400 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 401 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 402 ~(NFS_FABLKSIZE - 1); 403 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 404 if (max < nmp->nm_rsize && max > 0) { 405 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 406 if (nmp->nm_rsize == 0) 407 nmp->nm_rsize = max; 408 } 409 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 410 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 411 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 412 ~(NFS_DIRBLKSIZ - 1); 413 if (max < nmp->nm_readdirsize && max > 0) { 414 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 415 if (nmp->nm_readdirsize == 0) 416 nmp->nm_readdirsize = max; 417 } 418 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 419 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 420 nmp->nm_maxfilesize = maxfsize; 421 nmp->nm_state |= NFSSTA_GOTFSINFO; 422 } 423 m_freem(info.mrep); 424 info.mrep = NULL; 425 nfsmout: 426 return (error); 427 } 428 429 /* 430 * Mount a remote root fs via. nfs. This depends on the info in the 431 * nfs_diskless structure that has been filled in properly by some primary 432 * bootstrap. 433 * It goes something like this: 434 * - do enough of "ifconfig" by calling ifioctl() so that the system 435 * can talk to the server 436 * - If nfs_diskless.mygateway is filled in, use that address as 437 * a default gateway. 438 * - build the rootfs mount point and call mountnfs() to do the rest. 439 */ 440 int 441 nfs_mountroot(struct mount *mp) 442 { 443 struct mount *swap_mp; 444 struct nfsv3_diskless *nd = &nfsv3_diskless; 445 struct socket *so; 446 struct vnode *vp; 447 struct thread *td = curthread; /* XXX */ 448 int error, i; 449 u_long l; 450 char buf[128]; 451 452 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 453 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 454 #endif 455 456 /* 457 * XXX time must be non-zero when we init the interface or else 458 * the arp code will wedge... 459 */ 460 while (mycpu->gd_time_seconds == 0) 461 tsleep(mycpu, 0, "arpkludge", 10); 462 463 /* 464 * The boot code may have passed us a diskless structure. 465 */ 466 if (nfs_diskless_valid == 1) 467 nfs_convert_diskless(); 468 469 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 470 kprintf("nfs_mountroot: interface %s ip %s", 471 nd->myif.ifra_name, 472 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 473 kprintf(" bcast %s", 474 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 475 kprintf(" mask %s\n", 476 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 477 #undef SINP 478 479 /* 480 * XXX splnet, so networks will receive... 481 */ 482 crit_enter(); 483 484 /* 485 * BOOTP does not necessarily have to be compiled into the kernel 486 * for an NFS root to work. If we inherited the network 487 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 488 * out our interface for us and all we need to do is ifconfig the 489 * interface. We only do this if the interface has not already been 490 * ifconfig'd by e.g. BOOTP. 491 */ 492 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 493 if (error) { 494 panic("nfs_mountroot: socreate(%04x): %d", 495 nd->myif.ifra_addr.sa_family, error); 496 } 497 498 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 499 if (error) 500 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 501 502 soclose(so, FNONBLOCK); 503 504 /* 505 * If the gateway field is filled in, set it as the default route. 506 */ 507 if (nd->mygateway.sin_len != 0) { 508 struct sockaddr_in mask, sin; 509 510 bzero((caddr_t)&mask, sizeof(mask)); 511 sin = mask; 512 sin.sin_family = AF_INET; 513 sin.sin_len = sizeof(sin); 514 kprintf("nfs_mountroot: gateway %s\n", 515 inet_ntoa(nd->mygateway.sin_addr)); 516 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 517 (struct sockaddr *)&nd->mygateway, 518 (struct sockaddr *)&mask, 519 RTF_UP | RTF_GATEWAY); 520 if (error) 521 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 522 } 523 524 /* 525 * Create the rootfs mount point. 526 */ 527 nd->root_args.fh = nd->root_fh; 528 nd->root_args.fhsize = nd->root_fhsize; 529 l = ntohl(nd->root_saddr.sin_addr.s_addr); 530 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 531 (l >> 24) & 0xff, (l >> 16) & 0xff, 532 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 533 kprintf("NFS_ROOT: %s\n",buf); 534 if ((error = nfs_mountdiskless(buf, "/", MNT_RDONLY, 535 &nd->root_saddr, &nd->root_args, td, &vp, &mp)) != 0) { 536 mp->mnt_vfc->vfc_refcount--; 537 crit_exit(); 538 return (error); 539 } 540 541 swap_mp = NULL; 542 if (nd->swap_nblks) { 543 544 /* Convert to DEV_BSIZE instead of Kilobyte */ 545 nd->swap_nblks *= 2; 546 547 /* 548 * Create a fake mount point just for the swap vnode so that the 549 * swap file can be on a different server from the rootfs. 550 */ 551 nd->swap_args.fh = nd->swap_fh; 552 nd->swap_args.fhsize = nd->swap_fhsize; 553 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 554 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 555 (l >> 24) & 0xff, (l >> 16) & 0xff, 556 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 557 kprintf("NFS SWAP: %s\n",buf); 558 if ((error = nfs_mountdiskless(buf, "/swap", 0, 559 &nd->swap_saddr, &nd->swap_args, td, &vp, &swap_mp)) != 0) { 560 crit_exit(); 561 return (error); 562 } 563 vfs_unbusy(swap_mp); 564 565 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 566 nd->swap_nblks * DEV_BSIZE ; 567 568 /* 569 * Since the swap file is not the root dir of a file system, 570 * hack it to a regular file. 571 */ 572 vp->v_flag = 0; 573 vref(vp); 574 nfs_setvtype(vp, VREG); 575 swaponvp(td, vp, nd->swap_nblks); 576 } 577 578 mp->mnt_flag |= MNT_ROOTFS; 579 vfs_unbusy(mp); 580 581 /* 582 * This is not really an nfs issue, but it is much easier to 583 * set hostname here and then let the "/etc/rc.xxx" files 584 * mount the right /var based upon its preset value. 585 */ 586 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 587 hostname[MAXHOSTNAMELEN - 1] = '\0'; 588 for (i = 0; i < MAXHOSTNAMELEN; i++) 589 if (hostname[i] == '\0') 590 break; 591 inittodr(ntohl(nd->root_time)); 592 crit_exit(); 593 return (0); 594 } 595 596 /* 597 * Internal version of mount system call for diskless setup. 598 */ 599 static int 600 nfs_mountdiskless(char *path, char *which, int mountflag, 601 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 602 struct vnode **vpp, struct mount **mpp) 603 { 604 struct mount *mp; 605 struct sockaddr *nam; 606 int didalloc = 0; 607 int error; 608 609 mp = *mpp; 610 611 if (mp == NULL) { 612 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 613 kprintf("nfs_mountroot: NFS not configured"); 614 return (error); 615 } 616 didalloc = 1; 617 } 618 mp->mnt_kern_flag = 0; 619 mp->mnt_flag = mountflag; 620 nam = dup_sockaddr((struct sockaddr *)sin); 621 622 #if defined(BOOTP) || defined(NFS_ROOT) 623 if (args->fhsize == 0) { 624 char *xpath = path; 625 626 kprintf("NFS_ROOT: No FH passed from loader, attempting mount rpc..."); 627 while (*xpath && *xpath != ':') 628 ++xpath; 629 if (*xpath) 630 ++xpath; 631 args->fhsize = 0; 632 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 633 if (error) { 634 kprintf("failed error %d.\n", error); 635 goto haderror; 636 } 637 kprintf("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 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 646 mp->mnt_vfc->vfc_refcount--; 647 vfs_unbusy(mp); 648 if (didalloc) 649 kfree(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(struct nfsmount *nmp, struct nfs_args *argp) 659 { 660 int adjsock; 661 int maxio; 662 663 crit_enter(); 664 /* 665 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 666 * no sense in that context. 667 */ 668 if (argp->sotype == SOCK_STREAM) 669 nmp->nm_flag &= ~NFSMNT_NOCONN; 670 671 /* Also clear RDIRPLUS if not NFSv3, it crashes some servers */ 672 if ((argp->flags & NFSMNT_NFSV3) == 0) 673 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 674 675 /* Re-bind if rsrvd port requested and wasn't on one */ 676 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 677 && (argp->flags & NFSMNT_RESVPORT); 678 /* Also re-bind if we're switching to/from a connected UDP socket */ 679 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 680 (argp->flags & NFSMNT_NOCONN)); 681 682 /* Update flags atomically. Don't change the lock bits. */ 683 nmp->nm_flag = argp->flags | nmp->nm_flag; 684 crit_exit(); 685 686 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 687 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 688 if (nmp->nm_timeo < NFS_MINTIMEO) 689 nmp->nm_timeo = NFS_MINTIMEO; 690 else if (nmp->nm_timeo > NFS_MAXTIMEO) 691 nmp->nm_timeo = NFS_MAXTIMEO; 692 } 693 694 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 695 nmp->nm_retry = argp->retrans; 696 if (nmp->nm_retry > NFS_MAXREXMIT) 697 nmp->nm_retry = NFS_MAXREXMIT; 698 } 699 700 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 701 702 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 703 nmp->nm_wsize = argp->wsize; 704 /* Round down to multiple of blocksize */ 705 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 706 if (nmp->nm_wsize <= 0) 707 nmp->nm_wsize = NFS_FABLKSIZE; 708 } 709 if (nmp->nm_wsize > maxio) 710 nmp->nm_wsize = maxio; 711 if (nmp->nm_wsize > MAXBSIZE) 712 nmp->nm_wsize = MAXBSIZE; 713 714 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 715 nmp->nm_rsize = argp->rsize; 716 /* Round down to multiple of blocksize */ 717 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 718 if (nmp->nm_rsize <= 0) 719 nmp->nm_rsize = NFS_FABLKSIZE; 720 } 721 if (nmp->nm_rsize > maxio) 722 nmp->nm_rsize = maxio; 723 if (nmp->nm_rsize > MAXBSIZE) 724 nmp->nm_rsize = MAXBSIZE; 725 726 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 727 nmp->nm_readdirsize = argp->readdirsize; 728 } 729 if (nmp->nm_readdirsize > maxio) 730 nmp->nm_readdirsize = maxio; 731 if (nmp->nm_readdirsize > nmp->nm_rsize) 732 nmp->nm_readdirsize = nmp->nm_rsize; 733 734 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 735 nmp->nm_acregmin = argp->acregmin; 736 else 737 nmp->nm_acregmin = NFS_MINATTRTIMO; 738 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 739 nmp->nm_acregmax = argp->acregmax; 740 else 741 nmp->nm_acregmax = NFS_MAXATTRTIMO; 742 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 743 nmp->nm_acdirmin = argp->acdirmin; 744 else 745 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 746 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 747 nmp->nm_acdirmax = argp->acdirmax; 748 else 749 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 750 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 751 nmp->nm_acdirmin = nmp->nm_acdirmax; 752 if (nmp->nm_acregmin > nmp->nm_acregmax) 753 nmp->nm_acregmin = nmp->nm_acregmax; 754 755 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 756 if (argp->maxgrouplist <= NFS_MAXGRPS) 757 nmp->nm_numgrps = argp->maxgrouplist; 758 else 759 nmp->nm_numgrps = NFS_MAXGRPS; 760 } 761 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 762 if (argp->readahead <= NFS_MAXRAHEAD) 763 nmp->nm_readahead = argp->readahead; 764 else 765 nmp->nm_readahead = NFS_MAXRAHEAD; 766 } 767 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 768 if (argp->deadthresh <= NFS_NEVERDEAD) 769 nmp->nm_deadthresh = argp->deadthresh; 770 else 771 nmp->nm_deadthresh = NFS_NEVERDEAD; 772 } 773 774 adjsock |= ((nmp->nm_sotype != argp->sotype) || 775 (nmp->nm_soproto != argp->proto)); 776 nmp->nm_sotype = argp->sotype; 777 nmp->nm_soproto = argp->proto; 778 779 if (nmp->nm_so && adjsock) { 780 nfs_safedisconnect(nmp); 781 if (nmp->nm_sotype == SOCK_DGRAM) 782 while (nfs_connect(nmp, NULL)) { 783 kprintf("nfs_args: retrying connect\n"); 784 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 785 } 786 } 787 } 788 789 /* 790 * VFS Operations. 791 * 792 * mount system call 793 * It seems a bit dumb to copyinstr() the host and path here and then 794 * bcopy() them in mountnfs(), but I wanted to detect errors before 795 * doing the sockargs() call because sockargs() allocates an mbuf and 796 * an error after that means that I have to release the mbuf. 797 */ 798 /* ARGSUSED */ 799 static int 800 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 801 { 802 int error; 803 struct nfs_args args; 804 struct sockaddr *nam; 805 struct vnode *vp; 806 char pth[MNAMELEN], hst[MNAMELEN]; 807 size_t len; 808 u_char nfh[NFSX_V3FHMAX]; 809 810 if (path == NULL) { 811 nfs_mountroot(mp); 812 return (0); 813 } 814 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 815 if (error) 816 return (error); 817 if (args.version != NFS_ARGSVERSION) { 818 #ifdef COMPAT_PRELITE2 819 /* 820 * If the argument version is unknown, then assume the 821 * caller is a pre-lite2 4.4BSD client and convert its 822 * arguments. 823 */ 824 struct onfs_args oargs; 825 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 826 if (error) 827 return (error); 828 nfs_convert_oargs(&args,&oargs); 829 #else /* !COMPAT_PRELITE2 */ 830 return (EPROGMISMATCH); 831 #endif /* COMPAT_PRELITE2 */ 832 } 833 if (mp->mnt_flag & MNT_UPDATE) { 834 struct nfsmount *nmp = VFSTONFS(mp); 835 836 if (nmp == NULL) 837 return (EIO); 838 /* 839 * When doing an update, we can't change from or to 840 * v3, or change cookie translation 841 */ 842 args.flags = (args.flags & 843 ~(NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)) | 844 (nmp->nm_flag & 845 (NFSMNT_NFSV3/*|NFSMNT_XLATECOOKIE*/)); 846 nfs_decode_args(nmp, &args); 847 return (0); 848 } 849 850 /* 851 * Make the nfs_ip_paranoia sysctl serve as the default connection 852 * or no-connection mode for those protocols that support 853 * no-connection mode (the flag will be cleared later for protocols 854 * that do not support no-connection mode). This will allow a client 855 * to receive replies from a different IP then the request was 856 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 857 * not 0. 858 */ 859 if (nfs_ip_paranoia == 0) 860 args.flags |= NFSMNT_NOCONN; 861 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 862 return (EINVAL); 863 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 864 if (error) 865 return (error); 866 error = copyinstr(path, pth, MNAMELEN-1, &len); 867 if (error) 868 return (error); 869 bzero(&pth[len], MNAMELEN - len); 870 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 871 if (error) 872 return (error); 873 bzero(&hst[len], MNAMELEN - len); 874 /* sockargs() call must be after above copyin() calls */ 875 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 876 if (error) 877 return (error); 878 args.fh = nfh; 879 error = mountnfs(&args, mp, nam, pth, hst, &vp); 880 return (error); 881 } 882 883 /* 884 * Common code for mount and mountroot 885 */ 886 static int 887 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 888 char *pth, char *hst, struct vnode **vpp) 889 { 890 struct nfsmount *nmp; 891 struct nfsnode *np; 892 int error; 893 int rxcpu; 894 int txcpu; 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 mtx_init(&nmp->nm_rxlock); 905 mtx_init(&nmp->nm_txlock); 906 TAILQ_INIT(&nmp->nm_uidlruhead); 907 TAILQ_INIT(&nmp->nm_bioq); 908 TAILQ_INIT(&nmp->nm_reqq); 909 TAILQ_INIT(&nmp->nm_reqtxq); 910 TAILQ_INIT(&nmp->nm_reqrxq); 911 mp->mnt_data = (qaddr_t)nmp; 912 } 913 vfs_getnewfsid(mp); 914 nmp->nm_mountp = mp; 915 916 /* 917 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 918 * high, depending on whether we end up with negative offsets in 919 * the client or server somewhere. 2GB-1 may be safer. 920 * 921 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 922 * that we can handle until we find out otherwise. 923 * XXX Our "safe" limit on the client is what we can store in our 924 * buffer cache using signed(!) block numbers. 925 */ 926 if ((argp->flags & NFSMNT_NFSV3) == 0) 927 nmp->nm_maxfilesize = 0xffffffffLL; 928 else 929 nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1; 930 931 nmp->nm_timeo = NFS_TIMEO; 932 nmp->nm_retry = NFS_RETRANS; 933 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 934 nmp->nm_rsize = nmp->nm_wsize; 935 nmp->nm_readdirsize = NFS_READDIRSIZE; 936 nmp->nm_numgrps = NFS_MAXGRPS; 937 nmp->nm_readahead = NFS_DEFRAHEAD; 938 nmp->nm_deadthresh = NFS_DEADTHRESH; 939 nmp->nm_fhsize = argp->fhsize; 940 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 941 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 942 nmp->nm_nam = nam; 943 /* Set up the sockets and per-host congestion */ 944 nmp->nm_sotype = argp->sotype; 945 nmp->nm_soproto = argp->proto; 946 nmp->nm_cred = crhold(proc0.p_ucred); 947 948 nfs_decode_args(nmp, argp); 949 950 /* 951 * For Connection based sockets (TCP,...) defer the connect until 952 * the first request, in case the server is not responding. 953 */ 954 if (nmp->nm_sotype == SOCK_DGRAM && 955 (error = nfs_connect(nmp, NULL))) 956 goto bad; 957 958 /* 959 * This is silly, but it has to be set so that vinifod() works. 960 * We do not want to do an nfs_statfs() here since we can get 961 * stuck on a dead server and we are holding a lock on the mount 962 * point. 963 */ 964 mp->mnt_stat.f_iosize = 965 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 966 967 /* 968 * Install vop_ops for our vnops 969 */ 970 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 971 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 972 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 973 974 /* 975 * A reference count is needed on the nfsnode representing the 976 * remote root. If this object is not persistent, then backward 977 * traversals of the mount point (i.e. "..") will not work if 978 * the nfsnode gets flushed out of the cache. Ufs does not have 979 * this problem, because one can identify root inodes by their 980 * number == ROOTINO (2). 981 */ 982 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 983 if (error) 984 goto bad; 985 *vpp = NFSTOV(np); 986 987 /* 988 * Retrieval of mountpoint attributes is delayed until nfs_rot 989 * or nfs_statfs are first called. This will happen either when 990 * we first traverse the mount point or if somebody does a df(1). 991 * 992 * NFSSTA_GOTFSINFO is used to flag if we have successfully 993 * retrieved mountpoint attributes. In the case of NFSv3 we 994 * also flag static fsinfo. 995 */ 996 if (*vpp != NULL) 997 (*vpp)->v_type = VNON; 998 999 /* 1000 * Lose the lock but keep the ref. 1001 */ 1002 vn_unlock(*vpp); 1003 TAILQ_INSERT_TAIL(&nfs_mountq, nmp, nm_entry); 1004 1005 #ifdef SMP 1006 switch(ncpus) { 1007 case 0: 1008 case 1: 1009 rxcpu = 0; 1010 txcpu = 0; 1011 break; 1012 case 2: 1013 rxcpu = 0; 1014 txcpu = 1; 1015 break; 1016 default: 1017 rxcpu = 1; 1018 txcpu = 2; 1019 break; 1020 } 1021 #else 1022 rxcpu = 0; 1023 txcpu = 0; 1024 #endif 1025 1026 /* 1027 * Start the reader and writer threads. 1028 */ 1029 lwkt_create(nfssvc_iod_reader, nmp, &nmp->nm_rxthread, 1030 NULL, 0, rxcpu, "nfsiod_rx"); 1031 lwkt_create(nfssvc_iod_writer, nmp, &nmp->nm_txthread, 1032 NULL, 0, txcpu, "nfsiod_tx"); 1033 1034 return (0); 1035 bad: 1036 nfs_disconnect(nmp); 1037 nfs_free_mount(nmp); 1038 return (error); 1039 } 1040 1041 /* 1042 * unmount system call 1043 */ 1044 static int 1045 nfs_unmount(struct mount *mp, int mntflags) 1046 { 1047 struct nfsmount *nmp; 1048 int error, flags = 0; 1049 1050 if (mntflags & MNT_FORCE) 1051 flags |= FORCECLOSE; 1052 nmp = VFSTONFS(mp); 1053 /* 1054 * Goes something like this.. 1055 * - Call vflush() to clear out vnodes for this file system 1056 * - Close the socket 1057 * - Free up the data structures 1058 */ 1059 /* In the forced case, cancel any outstanding requests. */ 1060 if (flags & FORCECLOSE) { 1061 error = nfs_nmcancelreqs(nmp); 1062 if (error) 1063 return (error); 1064 } 1065 /* 1066 * Must handshake with nfs_clientd() if it is active. XXX 1067 */ 1068 nmp->nm_state |= NFSSTA_DISMINPROG; 1069 1070 /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ 1071 error = vflush(mp, 1, flags); 1072 if (error) { 1073 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1074 return (error); 1075 } 1076 1077 /* 1078 * We are now committed to the unmount. 1079 * For NQNFS, let the server daemon free the nfsmount structure. 1080 */ 1081 if (nmp->nm_flag & NFSMNT_KERB) 1082 nmp->nm_state |= NFSSTA_DISMNT; 1083 nfssvc_iod_stop1(nmp); 1084 nfs_disconnect(nmp); 1085 nfssvc_iod_stop2(nmp); 1086 TAILQ_REMOVE(&nfs_mountq, nmp, nm_entry); 1087 1088 if ((nmp->nm_flag & NFSMNT_KERB) == 0) { 1089 nfs_free_mount(nmp); 1090 } 1091 return (0); 1092 } 1093 1094 void 1095 nfs_free_mount(struct nfsmount *nmp) 1096 { 1097 if (nmp->nm_cred) { 1098 crfree(nmp->nm_cred); 1099 nmp->nm_cred = NULL; 1100 } 1101 if (nmp->nm_nam) { 1102 FREE(nmp->nm_nam, M_SONAME); 1103 nmp->nm_nam = NULL; 1104 } 1105 zfree(nfsmount_zone, nmp); 1106 } 1107 1108 /* 1109 * Return root of a filesystem 1110 */ 1111 static int 1112 nfs_root(struct mount *mp, struct vnode **vpp) 1113 { 1114 struct vnode *vp; 1115 struct nfsmount *nmp; 1116 struct vattr attrs; 1117 struct nfsnode *np; 1118 int error; 1119 1120 nmp = VFSTONFS(mp); 1121 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1122 if (error) 1123 return (error); 1124 vp = NFSTOV(np); 1125 1126 /* 1127 * Get transfer parameters and root vnode attributes 1128 */ 1129 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1130 if (nmp->nm_flag & NFSMNT_NFSV3) { 1131 error = nfs_fsinfo(nmp, vp, curthread); 1132 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1133 } else { 1134 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1135 nmp->nm_state |= NFSSTA_GOTFSINFO; 1136 1137 } 1138 } else { 1139 /* 1140 * The root vnode is usually cached by the namecache so do not 1141 * try to avoid going over the wire even if we have previous 1142 * information cached. A stale NFS mount can loop 1143 * forever resolving the root vnode if we return no-error when 1144 * there is in fact an error. 1145 */ 1146 np->n_attrstamp = 0; 1147 error = VOP_GETATTR(vp, &attrs); 1148 } 1149 if (vp->v_type == VNON) 1150 nfs_setvtype(vp, VDIR); 1151 vp->v_flag = VROOT; 1152 if (error) 1153 vput(vp); 1154 else 1155 *vpp = vp; 1156 return (error); 1157 } 1158 1159 struct scaninfo { 1160 int rescan; 1161 int waitfor; 1162 int allerror; 1163 }; 1164 1165 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1166 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1167 1168 /* 1169 * Flush out the buffer cache 1170 */ 1171 /* ARGSUSED */ 1172 static int 1173 nfs_sync(struct mount *mp, int waitfor) 1174 { 1175 struct scaninfo scaninfo; 1176 int error; 1177 1178 scaninfo.rescan = 1; 1179 scaninfo.waitfor = waitfor; 1180 scaninfo.allerror = 0; 1181 1182 /* 1183 * Force stale buffer cache information to be flushed. 1184 */ 1185 error = 0; 1186 while (error == 0 && scaninfo.rescan) { 1187 scaninfo.rescan = 0; 1188 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1189 nfs_sync_scan2, &scaninfo); 1190 } 1191 return(error); 1192 } 1193 1194 static int 1195 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1196 { 1197 struct scaninfo *info = data; 1198 1199 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree)) 1200 return(-1); 1201 if (info->waitfor == MNT_LAZY) 1202 return(-1); 1203 return(0); 1204 } 1205 1206 static int 1207 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1208 { 1209 struct scaninfo *info = data; 1210 int error; 1211 1212 error = VOP_FSYNC(vp, info->waitfor); 1213 if (error) 1214 info->allerror = error; 1215 return(0); 1216 } 1217 1218