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 #include <sys/objcache.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_extern.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 struct objcache *nfsmount_objcache; 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, &nfsstats, nfsstats, 99 "Nfs stats structure"); 100 static int nfs_ip_paranoia = 1; 101 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, &nfs_ip_paranoia, 0, 102 "Enable no-connection mode for protocols that support no-connection mode"); 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_statvfs(struct mount *mp, struct statvfs *sbp, 127 struct ucred *cred); 128 static int nfs_sync ( struct mount *mp, int waitfor); 129 130 /* 131 * nfs vfs operations. 132 */ 133 static struct vfsops nfs_vfsops = { 134 .vfs_mount = nfs_mount, 135 .vfs_unmount = nfs_unmount, 136 .vfs_root = nfs_root, 137 .vfs_statfs = nfs_statfs, 138 .vfs_statvfs = nfs_statvfs, 139 .vfs_sync = nfs_sync, 140 .vfs_init = nfs_init, 141 .vfs_uninit = nfs_uninit 142 }; 143 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK); 144 145 /* 146 * This structure must be filled in by a primary bootstrap or bootstrap 147 * server for a diskless/dataless machine. It is initialized below just 148 * to ensure that it is allocated to initialized data (.data not .bss). 149 */ 150 struct nfs_diskless nfs_diskless = { { { 0 } } }; 151 struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; 152 int nfs_diskless_valid = 0; 153 154 SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD, 155 &nfs_diskless_valid, 0, 156 "NFS diskless params were obtained"); 157 158 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 159 nfsv3_diskless.root_hostnam, 0, 160 "Host name for mount point"); 161 162 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 163 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 164 "%Ssockaddr_in", "Address of root server"); 165 166 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 167 nfsv3_diskless.swap_hostnam, 0, 168 "Host name for mount ppoint"); 169 170 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 171 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 172 "%Ssockaddr_in", "Address of swap server"); 173 174 175 void nfsargs_ntoh (struct nfs_args *); 176 static int nfs_mountdiskless (char *, char *, int, 177 struct sockaddr_in *, struct nfs_args *, 178 struct thread *, struct vnode **, 179 struct mount **); 180 static void nfs_convert_diskless (void); 181 static void nfs_convert_oargs (struct nfs_args *args, 182 struct onfs_args *oargs); 183 184 /* 185 * Calculate the buffer I/O block size to use. The maximum V2 block size 186 * is typically 8K, the maximum datagram size is typically 16K, and the 187 * maximum V3 block size is typically 32K. The buffer cache tends to work 188 * best with 16K blocks but we allow 32K for TCP connections. 189 * 190 * We force the block size to be at least a page for buffer cache efficiency. 191 */ 192 static int 193 nfs_iosize(int v3, int sotype) 194 { 195 int iosize; 196 int iomax; 197 198 if (v3) { 199 if (sotype == SOCK_STREAM) 200 iomax = NFS_MAXDATA; 201 else 202 iomax = NFS_MAXDGRAMDATA; 203 } else { 204 iomax = NFS_V2MAXDATA; 205 } 206 if ((iosize = nfs_io_size) > iomax) 207 iosize = iomax; 208 if (iosize < PAGE_SIZE) 209 iosize = PAGE_SIZE; 210 211 /* 212 * This is an aweful hack but until the buffer cache is rewritten 213 * we need it. The problem is that when you combine write() with 214 * mmap() the vm_page->valid bits can become weird looking 215 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 216 * at the file EOF. To solve the problem the BIO system needs to 217 * be guarenteed that the NFS iosize for regular files will be a 218 * multiple of PAGE_SIZE so it can invalidate the whole page 219 * rather then just the piece of it owned by the buffer when 220 * NFS does vinvalbuf() calls. 221 */ 222 if (iosize & PAGE_MASK) 223 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 224 return iosize; 225 } 226 227 static void 228 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 229 { 230 args->version = NFS_ARGSVERSION; 231 args->addr = oargs->addr; 232 args->addrlen = oargs->addrlen; 233 args->sotype = oargs->sotype; 234 args->proto = oargs->proto; 235 args->fh = oargs->fh; 236 args->fhsize = oargs->fhsize; 237 args->flags = oargs->flags; 238 args->wsize = oargs->wsize; 239 args->rsize = oargs->rsize; 240 args->readdirsize = oargs->readdirsize; 241 args->timeo = oargs->timeo; 242 args->retrans = oargs->retrans; 243 args->maxgrouplist = oargs->maxgrouplist; 244 args->readahead = oargs->readahead; 245 args->deadthresh = oargs->deadthresh; 246 args->hostname = oargs->hostname; 247 } 248 249 static void 250 nfs_convert_diskless(void) 251 { 252 int i; 253 254 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 255 sizeof(struct ifaliasreq)); 256 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 257 sizeof(struct sockaddr_in)); 258 nfs_convert_oargs(&nfsv3_diskless.swap_args, &nfs_diskless.swap_args); 259 260 /* 261 * Copy the NFS handle passed from the diskless code. 262 * 263 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 264 * will fail utterly with HAMMER due to limitations with NFSv2 265 * directory cookies. 266 */ 267 bcopy(nfs_diskless.swap_fh, nfsv3_diskless.swap_fh, NFSX_V2FH); 268 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 269 for (i = NFSX_V2FH - 1; i >= 0; --i) { 270 if (nfs_diskless.swap_fh[i]) 271 break; 272 } 273 if (i < 0) 274 nfsv3_diskless.swap_fhsize = 0; 275 nfsv3_diskless.swap_fhsize = 0; /* FORCE DISABLE */ 276 277 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 278 sizeof(struct sockaddr_in)); 279 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 280 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 281 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 282 sizeof(struct ucred)); 283 nfs_convert_oargs(&nfsv3_diskless.root_args, &nfs_diskless.root_args); 284 285 /* 286 * Copy the NFS handle passed from the diskless code. 287 * 288 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 289 * will fail utterly with HAMMER due to limitations with NFSv2 290 * directory cookies. 291 */ 292 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH); 293 nfsv3_diskless.root_fhsize = NFSX_V2FH; 294 for (i = NFSX_V2FH - 1; i >= 0; --i) { 295 if (nfs_diskless.root_fh[i]) 296 break; 297 } 298 if (i < 0) 299 nfsv3_diskless.root_fhsize = 0; 300 nfsv3_diskless.root_fhsize = 0; /* FORCE DISABLE */ 301 302 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 303 sizeof(struct sockaddr_in)); 304 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 305 nfsv3_diskless.root_time = nfs_diskless.root_time; 306 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 307 MAXHOSTNAMELEN); 308 nfs_diskless_valid = 3; 309 } 310 311 /* 312 * nfs statfs call 313 */ 314 int 315 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 316 { 317 struct vnode *vp; 318 struct nfs_statfs *sfp; 319 struct nfsmount *nmp = VFSTONFS(mp); 320 thread_t td = curthread; 321 int error = 0, retattr; 322 struct nfsnode *np; 323 u_quad_t tquad; 324 struct nfsm_info info; 325 326 info.mrep = NULL; 327 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 328 329 lwkt_gettoken(&nmp->nm_token); 330 331 #ifndef nolint 332 sfp = NULL; 333 #endif 334 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 335 if (error) { 336 lwkt_reltoken(&nmp->nm_token); 337 return (error); 338 } 339 vp = NFSTOV(np); 340 /* ignore the passed cred */ 341 cred = crget(); 342 cred->cr_ngroups = 1; 343 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 344 (void)nfs_fsinfo(nmp, vp, td); 345 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 346 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 347 ERROROUT(nfsm_fhtom(&info, vp)); 348 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 349 if (info.v3) { 350 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 351 NFS_LATTR_NOSHRINK)); 352 } 353 if (error) { 354 if (info.mrep != NULL) 355 m_freem(info.mrep); 356 goto nfsmout; 357 } 358 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 359 sbp->f_flags = nmp->nm_flag; 360 361 if (info.v3) { 362 sbp->f_bsize = NFS_FABLKSIZE; 363 tquad = fxdr_hyper(&sfp->sf_tbytes); 364 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 365 tquad = fxdr_hyper(&sfp->sf_fbytes); 366 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 367 tquad = fxdr_hyper(&sfp->sf_abytes); 368 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 369 sbp->f_files = (fxdr_unsigned(int32_t, 370 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 371 sbp->f_ffree = (fxdr_unsigned(int32_t, 372 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 373 } else { 374 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 375 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 376 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 377 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 378 sbp->f_files = 0; 379 sbp->f_ffree = 0; 380 } 381 382 /* 383 * Some values are pre-set in mnt_stat. Note in particular f_iosize 384 * cannot be changed once the filesystem is mounted as it is used 385 * as the basis for BIOs. 386 */ 387 if (sbp != &mp->mnt_stat) { 388 sbp->f_type = mp->mnt_vfc->vfc_typenum; 389 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 390 sbp->f_iosize = mp->mnt_stat.f_iosize; 391 } 392 m_freem(info.mrep); 393 info.mrep = NULL; 394 nfsmout: 395 vput(vp); 396 crfree(cred); 397 lwkt_reltoken(&nmp->nm_token); 398 return (error); 399 } 400 401 static int 402 nfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 403 { 404 struct vnode *vp; 405 struct nfs_statfs *sfp; 406 struct nfsmount *nmp = VFSTONFS(mp); 407 thread_t td = curthread; 408 int error = 0, retattr; 409 struct nfsnode *np; 410 struct nfsm_info info; 411 412 info.mrep = NULL; 413 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 414 lwkt_gettoken(&nmp->nm_token); 415 416 #ifndef nolint 417 sfp = NULL; 418 #endif 419 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 420 if (error) { 421 lwkt_reltoken(&nmp->nm_token); 422 return (error); 423 } 424 vp = NFSTOV(np); 425 /* ignore the passed cred */ 426 cred = crget(); 427 cred->cr_ngroups = 1; 428 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 429 (void)nfs_fsinfo(nmp, vp, td); 430 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 431 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 432 ERROROUT(nfsm_fhtom(&info, vp)); 433 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 434 if (info.v3) { 435 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 436 NFS_LATTR_NOSHRINK)); 437 } 438 if (error) { 439 if (info.mrep != NULL) 440 m_freem(info.mrep); 441 goto nfsmout; 442 } 443 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 444 sbp->f_flag = nmp->nm_flag; 445 sbp->f_owner = nmp->nm_cred->cr_ruid; 446 447 if (info.v3) { 448 sbp->f_bsize = NFS_FABLKSIZE; 449 sbp->f_frsize = NFS_FABLKSIZE; 450 sbp->f_blocks = (fxdr_hyper(&sfp->sf_tbytes) / 451 ((u_quad_t)NFS_FABLKSIZE)); 452 sbp->f_bfree = (fxdr_hyper(&sfp->sf_fbytes) / 453 ((u_quad_t)NFS_FABLKSIZE)); 454 sbp->f_bavail = (fxdr_hyper(&sfp->sf_abytes) / 455 ((u_quad_t)NFS_FABLKSIZE)); 456 sbp->f_files = fxdr_hyper(&sfp->sf_tfiles); 457 sbp->f_ffree = fxdr_hyper(&sfp->sf_ffiles); 458 sbp->f_favail = fxdr_hyper(&sfp->sf_afiles); 459 } else { 460 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 461 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 462 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 463 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 464 sbp->f_files = 0; 465 sbp->f_ffree = 0; 466 sbp->f_favail = 0; 467 } 468 sbp->f_syncreads = 0; 469 sbp->f_syncwrites = 0; 470 sbp->f_asyncreads = 0; 471 sbp->f_asyncwrites = 0; 472 sbp->f_type = mp->mnt_vfc->vfc_typenum; 473 474 m_freem(info.mrep); 475 info.mrep = NULL; 476 nfsmout: 477 vput(vp); 478 crfree(cred); 479 lwkt_reltoken(&nmp->nm_token); 480 return (error); 481 } 482 483 /* 484 * nfs version 3 fsinfo rpc call 485 */ 486 int 487 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 488 { 489 struct nfsv3_fsinfo *fsp; 490 u_int32_t pref, max; 491 int error = 0, retattr; 492 u_int64_t maxfsize; 493 struct nfsm_info info; 494 495 info.v3 = 1; 496 nfsstats.rpccnt[NFSPROC_FSINFO]++; 497 nfsm_reqhead(&info, vp, NFSPROC_FSINFO, NFSX_FH(1)); 498 ERROROUT(nfsm_fhtom(&info, vp)); 499 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSINFO, td, 500 nfs_vpcred(vp, ND_READ), &error)); 501 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, NFS_LATTR_NOSHRINK)); 502 if (error == 0) { 503 NULLOUT(fsp = nfsm_dissect(&info, NFSX_V3FSINFO)); 504 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 505 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 506 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 507 ~(NFS_FABLKSIZE - 1); 508 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 509 if (max < nmp->nm_wsize && max > 0) { 510 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 511 if (nmp->nm_wsize == 0) 512 nmp->nm_wsize = max; 513 } 514 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 515 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 516 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 517 ~(NFS_FABLKSIZE - 1); 518 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 519 if (max < nmp->nm_rsize && max > 0) { 520 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 521 if (nmp->nm_rsize == 0) 522 nmp->nm_rsize = max; 523 } 524 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 525 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 526 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 527 ~(NFS_DIRBLKSIZ - 1); 528 if (max < nmp->nm_readdirsize && max > 0) { 529 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 530 if (nmp->nm_readdirsize == 0) 531 nmp->nm_readdirsize = max; 532 } 533 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 534 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 535 nmp->nm_maxfilesize = maxfsize; 536 nmp->nm_state |= NFSSTA_GOTFSINFO; 537 538 /* 539 * Use the smaller of rsize/wsize for the biosize. 540 */ 541 if (nmp->nm_rsize < nmp->nm_wsize) 542 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_rsize; 543 else 544 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_wsize; 545 } 546 m_freem(info.mrep); 547 info.mrep = NULL; 548 nfsmout: 549 return (error); 550 } 551 552 /* 553 * Mount a remote root fs via. nfs. This depends on the info in the 554 * nfs_diskless structure that has been filled in properly by some primary 555 * bootstrap. 556 * It goes something like this: 557 * - do enough of "ifconfig" by calling ifioctl() so that the system 558 * can talk to the server 559 * - If nfs_diskless.mygateway is filled in, use that address as 560 * a default gateway. 561 * - build the rootfs mount point and call mountnfs() to do the rest. 562 */ 563 int 564 nfs_mountroot(struct mount *mp) 565 { 566 struct mount *swap_mp; 567 struct nfsv3_diskless *nd = &nfsv3_diskless; 568 struct socket *so; 569 struct vnode *vp; 570 struct thread *td = curthread; /* XXX */ 571 int error, i; 572 u_long l; 573 char buf[128]; 574 575 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 576 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 577 #endif 578 579 /* 580 * XXX time must be non-zero when we init the interface or else 581 * the arp code will wedge... 582 */ 583 while (mycpu->gd_time_seconds == 0) 584 tsleep(mycpu, 0, "arpkludge", 10); 585 586 /* 587 * The boot code may have passed us a diskless structure. 588 */ 589 kprintf("DISKLESS %d\n", nfs_diskless_valid); 590 if (nfs_diskless_valid == 1) 591 nfs_convert_diskless(); 592 593 /* 594 * NFSv3 is required. 595 */ 596 nd->root_args.flags |= NFSMNT_NFSV3 | NFSMNT_RDIRPLUS; 597 nd->swap_args.flags |= NFSMNT_NFSV3; 598 599 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 600 kprintf("nfs_mountroot: interface %s ip %s", 601 nd->myif.ifra_name, 602 inet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr)); 603 kprintf(" bcast %s", 604 inet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr)); 605 kprintf(" mask %s\n", 606 inet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr)); 607 #undef SINP 608 609 /* 610 * XXX splnet, so networks will receive... 611 */ 612 crit_enter(); 613 614 /* 615 * BOOTP does not necessarily have to be compiled into the kernel 616 * for an NFS root to work. If we inherited the network 617 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 618 * out our interface for us and all we need to do is ifconfig the 619 * interface. We only do this if the interface has not already been 620 * ifconfig'd by e.g. BOOTP. 621 */ 622 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 623 if (error) { 624 panic("nfs_mountroot: socreate(%04x): %d", 625 nd->myif.ifra_addr.sa_family, error); 626 } 627 628 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 629 if (error) 630 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 631 632 soclose(so, FNONBLOCK); 633 634 /* 635 * If the gateway field is filled in, set it as the default route. 636 */ 637 if (nd->mygateway.sin_len != 0) { 638 struct sockaddr_in mask, sin; 639 640 bzero((caddr_t)&mask, sizeof(mask)); 641 sin = mask; 642 sin.sin_family = AF_INET; 643 sin.sin_len = sizeof(sin); 644 kprintf("nfs_mountroot: gateway %s\n", 645 inet_ntoa(nd->mygateway.sin_addr)); 646 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 647 (struct sockaddr *)&nd->mygateway, 648 (struct sockaddr *)&mask, 649 RTF_UP | RTF_GATEWAY); 650 if (error) 651 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 652 } 653 654 /* 655 * Create the rootfs mount point. 656 */ 657 nd->root_args.fh = nd->root_fh; 658 nd->root_args.fhsize = nd->root_fhsize; 659 l = ntohl(nd->root_saddr.sin_addr.s_addr); 660 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 661 (l >> 24) & 0xff, (l >> 16) & 0xff, 662 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 663 kprintf("NFS_ROOT: %s\n",buf); 664 error = nfs_mountdiskless(buf, "/", MNT_RDONLY, &nd->root_saddr, 665 &nd->root_args, td, &vp, &mp); 666 if (error) { 667 mp->mnt_vfc->vfc_refcount--; 668 crit_exit(); 669 return (error); 670 } 671 672 swap_mp = NULL; 673 if (nd->swap_nblks) { 674 675 /* Convert to DEV_BSIZE instead of Kilobyte */ 676 nd->swap_nblks *= 2; 677 678 /* 679 * Create a fake mount point just for the swap vnode so that the 680 * swap file can be on a different server from the rootfs. 681 */ 682 nd->swap_args.fh = nd->swap_fh; 683 nd->swap_args.fhsize = nd->swap_fhsize; 684 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 685 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 686 (l >> 24) & 0xff, (l >> 16) & 0xff, 687 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 688 kprintf("NFS SWAP: %s\n",buf); 689 error = nfs_mountdiskless(buf, "/swap", 0, &nd->swap_saddr, 690 &nd->swap_args, td, &vp, &swap_mp); 691 if (error) { 692 crit_exit(); 693 return (error); 694 } 695 vfs_unbusy(swap_mp); 696 697 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 698 nd->swap_nblks * DEV_BSIZE ; 699 700 /* 701 * Since the swap file is not the root dir of a file system, 702 * hack it to a regular file. 703 */ 704 vclrflags(vp, VROOT); 705 vref(vp); 706 nfs_setvtype(vp, VREG); 707 swaponvp(td, vp, nd->swap_nblks); 708 } 709 710 mp->mnt_flag |= MNT_ROOTFS; 711 vfs_unbusy(mp); 712 713 /* 714 * This is not really an nfs issue, but it is much easier to 715 * set hostname here and then let the "/etc/rc.xxx" files 716 * mount the right /var based upon its preset value. 717 */ 718 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 719 hostname[MAXHOSTNAMELEN - 1] = '\0'; 720 for (i = 0; i < MAXHOSTNAMELEN; i++) 721 if (hostname[i] == '\0') 722 break; 723 inittodr(ntohl(nd->root_time)); 724 crit_exit(); 725 return (0); 726 } 727 728 /* 729 * Internal version of mount system call for diskless setup. 730 */ 731 static int 732 nfs_mountdiskless(char *path, char *which, int mountflag, 733 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 734 struct vnode **vpp, struct mount **mpp) 735 { 736 struct mount *mp; 737 struct sockaddr *nam; 738 int didalloc = 0; 739 int error; 740 741 mp = *mpp; 742 743 if (mp == NULL) { 744 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 745 kprintf("nfs_mountroot: NFS not configured"); 746 return (error); 747 } 748 didalloc = 1; 749 } 750 mp->mnt_kern_flag = 0; 751 mp->mnt_flag = mountflag; 752 nam = dup_sockaddr((struct sockaddr *)sin); 753 754 #if defined(BOOTP) || defined(NFS_ROOT) 755 if (args->fhsize == 0) { 756 char *xpath = path; 757 758 kprintf("NFS_ROOT: No FH passed from loader, attempting " 759 "mount rpc..."); 760 while (*xpath && *xpath != ':') 761 ++xpath; 762 if (*xpath) 763 ++xpath; 764 args->fhsize = 0; 765 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 766 if (error) { 767 kprintf("failed error %d.\n", error); 768 goto haderror; 769 } 770 kprintf("success!\n"); 771 } 772 #endif 773 774 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 775 #if defined(BOOTP) || defined(NFS_ROOT) 776 haderror: 777 #endif 778 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 779 mp->mnt_vfc->vfc_refcount--; 780 vfs_unbusy(mp); 781 if (didalloc) 782 kfree(mp, M_MOUNT); 783 FREE(nam, M_SONAME); 784 return (error); 785 } 786 *mpp = mp; 787 return (0); 788 } 789 790 static void 791 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp) 792 { 793 int adjsock; 794 int maxio; 795 796 crit_enter(); 797 /* 798 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 799 * no sense in that context. 800 */ 801 if (nmp->nm_sotype == SOCK_STREAM) { 802 nmp->nm_flag &= ~NFSMNT_NOCONN; 803 argp->flags &= ~NFSMNT_NOCONN; 804 } 805 806 /* 807 * readdirplus is NFSv3 only. 808 */ 809 if ((argp->flags & NFSMNT_NFSV3) == 0) { 810 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 811 argp->flags &= ~NFSMNT_RDIRPLUS; 812 } 813 814 /* 815 * Re-bind if rsrvd port flag has changed 816 */ 817 adjsock = (nmp->nm_flag & NFSMNT_RESVPORT) != 818 (argp->flags & NFSMNT_RESVPORT); 819 820 /* Update flags atomically. Don't change the lock bits. */ 821 nmp->nm_flag = argp->flags | nmp->nm_flag; 822 crit_exit(); 823 824 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 825 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 826 if (nmp->nm_timeo < NFS_MINTIMEO) 827 nmp->nm_timeo = NFS_MINTIMEO; 828 else if (nmp->nm_timeo > NFS_MAXTIMEO) 829 nmp->nm_timeo = NFS_MAXTIMEO; 830 } 831 832 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 833 nmp->nm_retry = argp->retrans; 834 if (nmp->nm_retry > NFS_MAXREXMIT) 835 nmp->nm_retry = NFS_MAXREXMIT; 836 } 837 838 /* 839 * These parameters effect the buffer cache and cannot be changed 840 * once we've successfully mounted. 841 */ 842 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 843 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, nmp->nm_sotype); 844 845 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 846 nmp->nm_wsize = argp->wsize; 847 /* Round down to multiple of blocksize */ 848 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 849 if (nmp->nm_wsize <= 0) 850 nmp->nm_wsize = NFS_FABLKSIZE; 851 } 852 if (nmp->nm_wsize > maxio) 853 nmp->nm_wsize = maxio; 854 if (nmp->nm_wsize > MAXBSIZE) 855 nmp->nm_wsize = MAXBSIZE; 856 857 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 858 nmp->nm_rsize = argp->rsize; 859 /* Round down to multiple of blocksize */ 860 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 861 if (nmp->nm_rsize <= 0) 862 nmp->nm_rsize = NFS_FABLKSIZE; 863 } 864 if (nmp->nm_rsize > maxio) 865 nmp->nm_rsize = maxio; 866 if (nmp->nm_rsize > MAXBSIZE) 867 nmp->nm_rsize = MAXBSIZE; 868 869 if ((argp->flags & NFSMNT_READDIRSIZE) && 870 argp->readdirsize > 0) { 871 nmp->nm_readdirsize = argp->readdirsize; 872 } 873 if (nmp->nm_readdirsize > maxio) 874 nmp->nm_readdirsize = maxio; 875 if (nmp->nm_readdirsize > nmp->nm_rsize) 876 nmp->nm_readdirsize = nmp->nm_rsize; 877 } 878 879 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 880 nmp->nm_acregmin = argp->acregmin; 881 else 882 nmp->nm_acregmin = NFS_MINATTRTIMO; 883 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 884 nmp->nm_acregmax = argp->acregmax; 885 else 886 nmp->nm_acregmax = NFS_MAXATTRTIMO; 887 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 888 nmp->nm_acdirmin = argp->acdirmin; 889 else 890 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 891 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 892 nmp->nm_acdirmax = argp->acdirmax; 893 else 894 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 895 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 896 nmp->nm_acdirmin = nmp->nm_acdirmax; 897 if (nmp->nm_acregmin > nmp->nm_acregmax) 898 nmp->nm_acregmin = nmp->nm_acregmax; 899 900 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 901 if (argp->maxgrouplist <= NFS_MAXGRPS) 902 nmp->nm_numgrps = argp->maxgrouplist; 903 else 904 nmp->nm_numgrps = NFS_MAXGRPS; 905 } 906 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 907 if (argp->readahead <= NFS_MAXRAHEAD) 908 nmp->nm_readahead = argp->readahead; 909 else 910 nmp->nm_readahead = NFS_MAXRAHEAD; 911 } 912 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 913 if (argp->deadthresh <= NFS_NEVERDEAD) 914 nmp->nm_deadthresh = argp->deadthresh; 915 else 916 nmp->nm_deadthresh = NFS_NEVERDEAD; 917 } 918 919 if (nmp->nm_so && adjsock) { 920 nfs_safedisconnect(nmp); 921 if (nmp->nm_sotype == SOCK_DGRAM) 922 while (nfs_connect(nmp, NULL)) { 923 kprintf("nfs_args: retrying connect\n"); 924 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 925 } 926 } 927 } 928 929 /* 930 * VFS Operations. 931 * 932 * mount system call 933 * It seems a bit dumb to copyinstr() the host and path here and then 934 * bcopy() them in mountnfs(), but I wanted to detect errors before 935 * doing the sockargs() call because sockargs() allocates an mbuf and 936 * an error after that means that I have to release the mbuf. 937 */ 938 /* ARGSUSED */ 939 static int 940 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 941 { 942 int error; 943 struct nfs_args args; 944 struct sockaddr *nam; 945 struct vnode *vp; 946 char pth[MNAMELEN], hst[MNAMELEN]; 947 size_t len; 948 u_char nfh[NFSX_V3FHMAX]; 949 950 if (path == NULL) { 951 nfs_mountroot(mp); 952 return (0); 953 } 954 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 955 if (error) 956 return (error); 957 if (args.version != NFS_ARGSVERSION) { 958 #ifdef COMPAT_PRELITE2 959 /* 960 * If the argument version is unknown, then assume the 961 * caller is a pre-lite2 4.4BSD client and convert its 962 * arguments. 963 */ 964 struct onfs_args oargs; 965 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 966 if (error) 967 return (error); 968 nfs_convert_oargs(&args,&oargs); 969 #else /* !COMPAT_PRELITE2 */ 970 return (EPROGMISMATCH); 971 #endif /* COMPAT_PRELITE2 */ 972 } 973 if (mp->mnt_flag & MNT_UPDATE) { 974 struct nfsmount *nmp = VFSTONFS(mp); 975 976 if (nmp == NULL) 977 return (EIO); 978 /* 979 * When doing an update, we can't change from or to 980 * v3, or change cookie translation, or rsize or wsize. 981 */ 982 args.flags &= ~(NFSMNT_NFSV3 | NFSMNT_RSIZE | NFSMNT_WSIZE); 983 args.flags |= nmp->nm_flag & (NFSMNT_NFSV3); 984 nfs_decode_args(nmp, &args); 985 return (0); 986 } 987 988 /* 989 * Make the nfs_ip_paranoia sysctl serve as the default connection 990 * or no-connection mode for those protocols that support 991 * no-connection mode (the flag will be cleared later for protocols 992 * that do not support no-connection mode). This will allow a client 993 * to receive replies from a different IP then the request was 994 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 995 * not 0. 996 */ 997 if (nfs_ip_paranoia == 0) 998 args.flags |= NFSMNT_NOCONN; 999 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 1000 return (EINVAL); 1001 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 1002 if (error) 1003 return (error); 1004 error = copyinstr(path, pth, MNAMELEN-1, &len); 1005 if (error) 1006 return (error); 1007 bzero(&pth[len], MNAMELEN - len); 1008 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 1009 if (error) 1010 return (error); 1011 bzero(&hst[len], MNAMELEN - len); 1012 /* sockargs() call must be after above copyin() calls */ 1013 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 1014 if (error) 1015 return (error); 1016 args.fh = nfh; 1017 error = mountnfs(&args, mp, nam, pth, hst, &vp); 1018 return (error); 1019 } 1020 1021 /* 1022 * Common code for mount and mountroot 1023 */ 1024 static int 1025 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 1026 char *pth, char *hst, struct vnode **vpp) 1027 { 1028 struct nfsmount *nmp; 1029 struct nfsnode *np; 1030 int error; 1031 int rxcpu; 1032 int txcpu; 1033 1034 if (mp->mnt_flag & MNT_UPDATE) { 1035 nmp = VFSTONFS(mp); 1036 /* update paths, file handles, etc, here XXX */ 1037 FREE(nam, M_SONAME); 1038 return (0); 1039 } else { 1040 nmp = objcache_get(nfsmount_objcache, M_WAITOK); 1041 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 1042 mtx_init(&nmp->nm_rxlock); 1043 mtx_init(&nmp->nm_txlock); 1044 TAILQ_INIT(&nmp->nm_uidlruhead); 1045 TAILQ_INIT(&nmp->nm_bioq); 1046 TAILQ_INIT(&nmp->nm_reqq); 1047 TAILQ_INIT(&nmp->nm_reqtxq); 1048 TAILQ_INIT(&nmp->nm_reqrxq); 1049 mp->mnt_data = (qaddr_t)nmp; 1050 lwkt_token_init(&nmp->nm_token, "nfs_token"); 1051 } 1052 vfs_getnewfsid(mp); 1053 nmp->nm_mountp = mp; 1054 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 1055 1056 lwkt_gettoken(&nmp->nm_token); 1057 1058 /* 1059 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 1060 * high, depending on whether we end up with negative offsets in 1061 * the client or server somewhere. 2GB-1 may be safer. 1062 * 1063 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 1064 * that we can handle until we find out otherwise. Note that seek 1065 * offsets are signed. 1066 */ 1067 if ((argp->flags & NFSMNT_NFSV3) == 0) 1068 nmp->nm_maxfilesize = 0xffffffffLL; 1069 else 1070 nmp->nm_maxfilesize = 0x7fffffffffffffffLL; 1071 1072 nmp->nm_timeo = NFS_TIMEO; 1073 nmp->nm_retry = NFS_RETRANS; 1074 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 1075 nmp->nm_rsize = nmp->nm_wsize; 1076 nmp->nm_readdirsize = NFS_READDIRSIZE; 1077 nmp->nm_numgrps = NFS_MAXGRPS; 1078 nmp->nm_readahead = NFS_DEFRAHEAD; 1079 nmp->nm_deadthresh = NFS_DEADTHRESH; 1080 nmp->nm_fhsize = argp->fhsize; 1081 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 1082 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 1083 nmp->nm_nam = nam; 1084 /* Set up the sockets and per-host congestion */ 1085 nmp->nm_sotype = argp->sotype; 1086 nmp->nm_soproto = argp->proto; 1087 nmp->nm_cred = crhold(proc0.p_ucred); 1088 1089 nfs_decode_args(nmp, argp); 1090 1091 /* 1092 * For Connection based sockets (TCP,...) defer the connect until 1093 * the first request, in case the server is not responding. 1094 */ 1095 if (nmp->nm_sotype == SOCK_DGRAM && 1096 (error = nfs_connect(nmp, NULL))) 1097 goto bad; 1098 1099 /* 1100 * This is silly, but it has to be set so that vinifod() works. 1101 * We do not want to do an nfs_statfs() here since we can get 1102 * stuck on a dead server and we are holding a lock on the mount 1103 * point. 1104 */ 1105 mp->mnt_stat.f_iosize = 1106 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 1107 1108 /* 1109 * Install vop_ops for our vnops 1110 */ 1111 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 1112 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 1113 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 1114 1115 /* 1116 * A reference count is needed on the nfsnode representing the 1117 * remote root. If this object is not persistent, then backward 1118 * traversals of the mount point (i.e. "..") will not work if 1119 * the nfsnode gets flushed out of the cache. Ufs does not have 1120 * this problem, because one can identify root inodes by their 1121 * number == ROOTINO (2). 1122 */ 1123 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1124 if (error) 1125 goto bad; 1126 *vpp = NFSTOV(np); 1127 1128 /* 1129 * Retrieval of mountpoint attributes is delayed until nfs_rot 1130 * or nfs_statfs are first called. This will happen either when 1131 * we first traverse the mount point or if somebody does a df(1). 1132 * 1133 * NFSSTA_GOTFSINFO is used to flag if we have successfully 1134 * retrieved mountpoint attributes. In the case of NFSv3 we 1135 * also flag static fsinfo. 1136 */ 1137 if (*vpp != NULL) 1138 (*vpp)->v_type = VNON; 1139 1140 /* 1141 * Lose the lock but keep the ref. 1142 */ 1143 vn_unlock(*vpp); 1144 lwkt_gettoken(&nfs_token); 1145 TAILQ_INSERT_TAIL(&nfs_mountq, nmp, nm_entry); 1146 lwkt_reltoken(&nfs_token); 1147 1148 #ifdef SMP 1149 switch(ncpus) { 1150 case 0: 1151 case 1: 1152 rxcpu = 0; 1153 txcpu = 0; 1154 break; 1155 case 2: 1156 rxcpu = 0; 1157 txcpu = 1; 1158 break; 1159 default: 1160 rxcpu = 1; 1161 txcpu = 2; 1162 break; 1163 } 1164 #else 1165 rxcpu = 0; 1166 txcpu = 0; 1167 #endif 1168 1169 /* 1170 * Start the reader and writer threads. 1171 */ 1172 lwkt_create(nfssvc_iod_reader, nmp, &nmp->nm_rxthread, 1173 NULL, 0, rxcpu, "nfsiod_rx"); 1174 lwkt_create(nfssvc_iod_writer, nmp, &nmp->nm_txthread, 1175 NULL, 0, txcpu, "nfsiod_tx"); 1176 lwkt_reltoken(&nmp->nm_token); 1177 return (0); 1178 bad: 1179 nfs_disconnect(nmp); 1180 lwkt_reltoken(&nmp->nm_token); 1181 nfs_free_mount(nmp); 1182 return (error); 1183 } 1184 1185 /* 1186 * unmount system call 1187 */ 1188 static int 1189 nfs_unmount(struct mount *mp, int mntflags) 1190 { 1191 struct nfsmount *nmp; 1192 int error, flags = 0; 1193 1194 nmp = VFSTONFS(mp); 1195 lwkt_gettoken(&nmp->nm_token); 1196 if (mntflags & MNT_FORCE) { 1197 flags |= FORCECLOSE; 1198 nmp->nm_flag |= NFSMNT_FORCE; 1199 } 1200 1201 /* 1202 * Goes something like this.. 1203 * - Call vflush() to clear out vnodes for this file system 1204 * - Close the socket 1205 * - Free up the data structures 1206 */ 1207 /* In the forced case, cancel any outstanding requests. */ 1208 if (flags & FORCECLOSE) { 1209 error = nfs_nmcancelreqs(nmp); 1210 if (error) { 1211 kprintf("NFS: %s: Unable to cancel all requests\n", 1212 mp->mnt_stat.f_mntfromname); 1213 /* continue anyway */ 1214 } 1215 } 1216 1217 /* 1218 * Must handshake with nfs_clientd() if it is active. XXX 1219 */ 1220 nmp->nm_state |= NFSSTA_DISMINPROG; 1221 1222 /* 1223 * We hold 1 extra ref on the root vnode; see comment in mountnfs(). 1224 * 1225 * If this doesn't work and we are doing a forced unmount we continue 1226 * anyway. 1227 */ 1228 error = vflush(mp, 1, flags); 1229 if (error) { 1230 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1231 if ((flags & FORCECLOSE) == 0) { 1232 lwkt_reltoken(&nmp->nm_token); 1233 return (error); 1234 } 1235 } 1236 1237 /* 1238 * We are now committed to the unmount. 1239 * For NQNFS, let the server daemon free the nfsmount structure. 1240 */ 1241 if (nmp->nm_flag & NFSMNT_KERB) 1242 nmp->nm_state |= NFSSTA_DISMNT; 1243 nfssvc_iod_stop1(nmp); 1244 nfs_disconnect(nmp); 1245 nfssvc_iod_stop2(nmp); 1246 1247 lwkt_gettoken(&nfs_token); 1248 TAILQ_REMOVE(&nfs_mountq, nmp, nm_entry); 1249 lwkt_reltoken(&nfs_token); 1250 1251 lwkt_reltoken(&nmp->nm_token); 1252 1253 if ((nmp->nm_flag & NFSMNT_KERB) == 0) { 1254 nfs_free_mount(nmp); 1255 } 1256 return (0); 1257 } 1258 1259 void 1260 nfs_free_mount(struct nfsmount *nmp) 1261 { 1262 if (nmp->nm_cred) { 1263 crfree(nmp->nm_cred); 1264 nmp->nm_cred = NULL; 1265 } 1266 if (nmp->nm_nam) { 1267 FREE(nmp->nm_nam, M_SONAME); 1268 nmp->nm_nam = NULL; 1269 } 1270 objcache_put(nfsmount_objcache, nmp); 1271 } 1272 1273 /* 1274 * Return root of a filesystem 1275 */ 1276 static int 1277 nfs_root(struct mount *mp, struct vnode **vpp) 1278 { 1279 struct vnode *vp; 1280 struct nfsmount *nmp; 1281 struct vattr attrs; 1282 struct nfsnode *np; 1283 int error; 1284 1285 nmp = VFSTONFS(mp); 1286 lwkt_gettoken(&nmp->nm_token); 1287 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); 1288 if (error) { 1289 lwkt_reltoken(&nmp->nm_token); 1290 return (error); 1291 } 1292 vp = NFSTOV(np); 1293 1294 /* 1295 * Get transfer parameters and root vnode attributes 1296 * 1297 * NOTE: nfs_fsinfo() is expected to override the default 1298 * f_iosize we set. 1299 */ 1300 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1301 if (nmp->nm_flag & NFSMNT_NFSV3) { 1302 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1303 error = nfs_fsinfo(nmp, vp, curthread); 1304 } else { 1305 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1306 nmp->nm_state |= NFSSTA_GOTFSINFO; 1307 1308 } 1309 } else { 1310 /* 1311 * The root vnode is usually cached by the namecache so do not 1312 * try to avoid going over the wire even if we have previous 1313 * information cached. A stale NFS mount can loop 1314 * forever resolving the root vnode if we return no-error when 1315 * there is in fact an error. 1316 */ 1317 np->n_attrstamp = 0; 1318 error = VOP_GETATTR(vp, &attrs); 1319 } 1320 if (vp->v_type == VNON) 1321 nfs_setvtype(vp, VDIR); 1322 vsetflags(vp, VROOT); 1323 if (error) 1324 vput(vp); 1325 else 1326 *vpp = vp; 1327 lwkt_reltoken(&nmp->nm_token); 1328 return (error); 1329 } 1330 1331 struct scaninfo { 1332 int rescan; 1333 int waitfor; 1334 int allerror; 1335 }; 1336 1337 static int nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data); 1338 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1339 1340 /* 1341 * Flush out the buffer cache 1342 */ 1343 /* ARGSUSED */ 1344 static int 1345 nfs_sync(struct mount *mp, int waitfor) 1346 { 1347 struct nfsmount *nmp = VFSTONFS(mp); 1348 struct scaninfo scaninfo; 1349 int error; 1350 1351 scaninfo.rescan = 1; 1352 scaninfo.waitfor = waitfor; 1353 scaninfo.allerror = 0; 1354 1355 /* 1356 * Force stale buffer cache information to be flushed. 1357 */ 1358 lwkt_gettoken(&nmp->nm_token); 1359 error = 0; 1360 while (error == 0 && scaninfo.rescan) { 1361 scaninfo.rescan = 0; 1362 error = vmntvnodescan(mp, VMSC_GETVP, nfs_sync_scan1, 1363 nfs_sync_scan2, &scaninfo); 1364 } 1365 lwkt_reltoken(&nmp->nm_token); 1366 return(error); 1367 } 1368 1369 static int 1370 nfs_sync_scan1(struct mount *mp, struct vnode *vp, void *data) 1371 { 1372 struct scaninfo *info = data; 1373 1374 if (vn_islocked(vp) || RB_EMPTY(&vp->v_rbdirty_tree)) 1375 return(-1); 1376 if (info->waitfor & MNT_LAZY) 1377 return(-1); 1378 return(0); 1379 } 1380 1381 static int 1382 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1383 { 1384 struct scaninfo *info = data; 1385 int error; 1386 1387 error = VOP_FSYNC(vp, info->waitfor, 0); 1388 if (error) 1389 info->allerror = error; 1390 return(0); 1391 } 1392 1393