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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 33 * $FreeBSD: src/sys/nfs/nfs_vfsops.c,v 1.91.2.7 2003/01/27 20:04:08 dillon Exp $ 34 */ 35 36 #include "opt_bootp.h" 37 #include "opt_nfsroot.h" 38 39 #include <sys/param.h> 40 #include <sys/sockio.h> 41 #include <sys/proc.h> 42 #include <sys/vnode.h> 43 #include <sys/fcntl.h> 44 #include <sys/kernel.h> 45 #include <sys/sysctl.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/systm.h> 52 #include <sys/objcache.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_extern.h> 56 57 #include <net/if.h> 58 #include <net/if_var.h> 59 #include <net/route.h> 60 #include <netinet/in.h> 61 62 #include <sys/thread2.h> 63 #include <sys/mutex2.h> 64 65 #include "rpcv2.h" 66 #include "nfsproto.h" 67 #include "nfs.h" 68 #include "nfsmount.h" 69 #include "nfsnode.h" 70 #include "xdr_subs.h" 71 #include "nfsm_subs.h" 72 #include "nfsdiskless.h" 73 #include "nfsmountrpc.h" 74 75 extern int nfs_mountroot(struct mount *mp); 76 extern void bootpc_init(void); 77 78 extern struct vop_ops nfsv2_vnode_vops; 79 extern struct vop_ops nfsv2_fifo_vops; 80 extern struct vop_ops nfsv2_spec_vops; 81 82 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 83 MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); 84 MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure"); 85 MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); 86 MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor"); 87 MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure"); 88 MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); 89 90 struct objcache *nfsmount_objcache; 91 92 struct nfsstats nfsstats; 93 SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem"); 94 SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD, &nfsstats, nfsstats, 95 "Nfs stats structure"); 96 static int nfs_ip_paranoia = 1; 97 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, &nfs_ip_paranoia, 0, 98 "Enable no-connection mode for protocols that support no-connection mode"); 99 #ifdef NFS_DEBUG 100 int nfs_debug; 101 SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, ""); 102 #endif 103 104 /* 105 * Tunable to determine the Read/Write unit size. Maximum value 106 * is NFS_MAXDATA. We also default to NFS_MAXDATA. 107 */ 108 static int nfs_io_size = NFS_MAXDATA; 109 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_io_size, CTLFLAG_RW, 110 &nfs_io_size, 0, "NFS optimal I/O unit size"); 111 112 static void nfs_decode_args (struct nfsmount *nmp, 113 struct nfs_args *argp); 114 static int mountnfs (struct nfs_args *,struct mount *, 115 struct sockaddr *,char *,char *,struct vnode **); 116 static int nfs_mount ( struct mount *mp, char *path, caddr_t data, 117 struct ucred *cred); 118 static int nfs_unmount ( struct mount *mp, int mntflags); 119 static int nfs_root ( struct mount *mp, struct vnode **vpp); 120 static int nfs_statfs ( struct mount *mp, struct statfs *sbp, 121 struct ucred *cred); 122 static int nfs_statvfs(struct mount *mp, struct statvfs *sbp, 123 struct ucred *cred); 124 static int nfs_sync ( struct mount *mp, int waitfor); 125 126 /* 127 * nfs vfs operations. 128 */ 129 static struct vfsops nfs_vfsops = { 130 .vfs_flags = 0, 131 .vfs_mount = nfs_mount, 132 .vfs_unmount = nfs_unmount, 133 .vfs_root = nfs_root, 134 .vfs_statfs = nfs_statfs, 135 .vfs_statvfs = nfs_statvfs, 136 .vfs_sync = nfs_sync, 137 .vfs_init = nfs_init, 138 .vfs_uninit = nfs_uninit 139 }; 140 VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK | VFCF_MPSAFE); 141 MODULE_VERSION(nfs, 1); 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 "NFS diskless params were obtained"); 155 156 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, 157 nfsv3_diskless.root_hostnam, 0, 158 "Host name for mount point"); 159 160 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, 161 &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, 162 "%Ssockaddr_in", "Address of root server"); 163 164 SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD, 165 nfsv3_diskless.swap_hostnam, 0, 166 "Host name for mount ppoint"); 167 168 SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD, 169 &nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr, 170 "%Ssockaddr_in", "Address of swap server"); 171 172 173 void nfsargs_ntoh (struct nfs_args *); 174 static int nfs_mountdiskless (char *, char *, int, 175 struct sockaddr_in *, struct nfs_args *, 176 struct thread *, struct vnode **, 177 struct mount **); 178 static void nfs_convert_diskless (void); 179 static void nfs_convert_oargs (struct nfs_args *args, 180 struct onfs_args *oargs); 181 182 /* 183 * Calculate the buffer I/O block size to use. The maximum V2 block size 184 * is typically 8K, the maximum datagram size is typically 16K, and the 185 * maximum V3 block size is typically 32K. The buffer cache tends to work 186 * best with 16K blocks but we allow 32K for TCP connections. 187 * 188 * We force the block size to be at least a page for buffer cache efficiency. 189 */ 190 static int 191 nfs_iosize(int v3, int sotype) 192 { 193 int iosize; 194 int iomax; 195 196 if (v3) { 197 if (sotype == SOCK_STREAM) 198 iomax = NFS_MAXDATA; 199 else 200 iomax = NFS_MAXDGRAMDATA; 201 } else { 202 iomax = NFS_V2MAXDATA; 203 } 204 if ((iosize = nfs_io_size) > iomax) 205 iosize = iomax; 206 if (iosize < PAGE_SIZE) 207 iosize = PAGE_SIZE; 208 209 /* 210 * This is an aweful hack but until the buffer cache is rewritten 211 * we need it. The problem is that when you combine write() with 212 * mmap() the vm_page->valid bits can become weird looking 213 * (e.g. 0xfc). This occurs because NFS uses piecemeal buffers 214 * at the file EOF. To solve the problem the BIO system needs to 215 * be guarenteed that the NFS iosize for regular files will be a 216 * multiple of PAGE_SIZE so it can invalidate the whole page 217 * rather then just the piece of it owned by the buffer when 218 * NFS does vinvalbuf() calls. 219 */ 220 if (iosize & PAGE_MASK) 221 iosize = (iosize & ~PAGE_MASK) + PAGE_SIZE; 222 return iosize; 223 } 224 225 static void 226 nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs) 227 { 228 args->version = NFS_ARGSVERSION; 229 args->addr = oargs->addr; 230 args->addrlen = oargs->addrlen; 231 args->sotype = oargs->sotype; 232 args->proto = oargs->proto; 233 args->fh = oargs->fh; 234 args->fhsize = oargs->fhsize; 235 args->flags = oargs->flags; 236 args->wsize = oargs->wsize; 237 args->rsize = oargs->rsize; 238 args->readdirsize = oargs->readdirsize; 239 args->timeo = oargs->timeo; 240 args->retrans = oargs->retrans; 241 args->maxgrouplist = oargs->maxgrouplist; 242 args->readahead = oargs->readahead; 243 args->deadthresh = oargs->deadthresh; 244 args->hostname = oargs->hostname; 245 } 246 247 static void 248 nfs_convert_diskless(void) 249 { 250 int i; 251 252 bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif, 253 sizeof(struct ifaliasreq)); 254 bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway, 255 sizeof(struct sockaddr_in)); 256 nfs_convert_oargs(&nfsv3_diskless.swap_args, &nfs_diskless.swap_args); 257 258 /* 259 * Copy the NFS handle passed from the diskless code. 260 * 261 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 262 * will fail utterly with HAMMER due to limitations with NFSv2 263 * directory cookies. 264 */ 265 bcopy(nfs_diskless.swap_fh, nfsv3_diskless.swap_fh, NFSX_V2FH); 266 nfsv3_diskless.swap_fhsize = NFSX_V2FH; 267 for (i = NFSX_V2FH - 1; i >= 0; --i) { 268 if (nfs_diskless.swap_fh[i]) 269 break; 270 } 271 if (i < 0) 272 nfsv3_diskless.swap_fhsize = 0; 273 nfsv3_diskless.swap_fhsize = 0; /* FORCE DISABLE */ 274 275 bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr, 276 sizeof(struct sockaddr_in)); 277 bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN); 278 nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks; 279 bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred, 280 sizeof(struct ucred)); 281 nfs_convert_oargs(&nfsv3_diskless.root_args, &nfs_diskless.root_args); 282 283 /* 284 * Copy the NFS handle passed from the diskless code. 285 * 286 * XXX CURRENTLY DISABLED - bootp passes us a NFSv2 handle which 287 * will fail utterly with HAMMER due to limitations with NFSv2 288 * directory cookies. 289 */ 290 bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH); 291 nfsv3_diskless.root_fhsize = NFSX_V2FH; 292 for (i = NFSX_V2FH - 1; i >= 0; --i) { 293 if (nfs_diskless.root_fh[i]) 294 break; 295 } 296 if (i < 0) 297 nfsv3_diskless.root_fhsize = 0; 298 nfsv3_diskless.root_fhsize = 0; /* FORCE DISABLE */ 299 300 bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr, 301 sizeof(struct sockaddr_in)); 302 bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN); 303 nfsv3_diskless.root_time = nfs_diskless.root_time; 304 bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam, 305 MAXHOSTNAMELEN); 306 nfs_diskless_valid = 3; 307 } 308 309 /* 310 * nfs statfs call 311 */ 312 int 313 nfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 314 { 315 struct vnode *vp; 316 struct nfs_statfs *sfp; 317 struct nfsmount *nmp = VFSTONFS(mp); 318 thread_t td = curthread; 319 int error = 0, retattr; 320 struct nfsnode *np; 321 u_quad_t tquad; 322 struct nfsm_info info; 323 324 info.mrep = NULL; 325 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 326 327 lwkt_gettoken(&nmp->nm_token); 328 329 #ifndef nolint 330 sfp = NULL; 331 #endif 332 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 333 if (error) { 334 lwkt_reltoken(&nmp->nm_token); 335 return (error); 336 } 337 vp = NFSTOV(np); 338 /* ignore the passed cred */ 339 cred = crget(); 340 cred->cr_ngroups = 1; 341 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 342 (void)nfs_fsinfo(nmp, vp, td); 343 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 344 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 345 ERROROUT(nfsm_fhtom(&info, vp)); 346 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 347 if (info.v3) { 348 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 349 NFS_LATTR_NOSHRINK)); 350 } 351 if (error) { 352 if (info.mrep != NULL) 353 m_freem(info.mrep); 354 goto nfsmout; 355 } 356 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 357 sbp->f_flags = nmp->nm_flag; 358 359 if (info.v3) { 360 sbp->f_bsize = NFS_FABLKSIZE; 361 tquad = fxdr_hyper(&sfp->sf_tbytes); 362 sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 363 tquad = fxdr_hyper(&sfp->sf_fbytes); 364 sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 365 tquad = fxdr_hyper(&sfp->sf_abytes); 366 sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE)); 367 sbp->f_files = (fxdr_unsigned(int32_t, 368 sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff); 369 sbp->f_ffree = (fxdr_unsigned(int32_t, 370 sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff); 371 } else { 372 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 373 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 374 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 375 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 376 sbp->f_files = 0; 377 sbp->f_ffree = 0; 378 } 379 380 /* 381 * Some values are pre-set in mnt_stat. Note in particular f_iosize 382 * cannot be changed once the filesystem is mounted as it is used 383 * as the basis for BIOs. 384 */ 385 if (sbp != &mp->mnt_stat) { 386 sbp->f_type = mp->mnt_vfc->vfc_typenum; 387 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 388 sbp->f_iosize = mp->mnt_stat.f_iosize; 389 } 390 m_freem(info.mrep); 391 info.mrep = NULL; 392 nfsmout: 393 vput(vp); 394 crfree(cred); 395 lwkt_reltoken(&nmp->nm_token); 396 return (error); 397 } 398 399 static int 400 nfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) 401 { 402 struct vnode *vp; 403 struct nfs_statfs *sfp; 404 struct nfsmount *nmp = VFSTONFS(mp); 405 thread_t td = curthread; 406 int error = 0, retattr; 407 struct nfsnode *np; 408 struct nfsm_info info; 409 410 info.mrep = NULL; 411 info.v3 = (nmp->nm_flag & NFSMNT_NFSV3); 412 lwkt_gettoken(&nmp->nm_token); 413 414 #ifndef nolint 415 sfp = NULL; 416 #endif 417 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 418 if (error) { 419 lwkt_reltoken(&nmp->nm_token); 420 return (error); 421 } 422 vp = NFSTOV(np); 423 /* ignore the passed cred */ 424 cred = crget(); 425 cred->cr_ngroups = 1; 426 if (info.v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) 427 (void)nfs_fsinfo(nmp, vp, td); 428 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 429 nfsm_reqhead(&info, vp, NFSPROC_FSSTAT, NFSX_FH(info.v3)); 430 ERROROUT(nfsm_fhtom(&info, vp)); 431 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSSTAT, td, cred, &error)); 432 if (info.v3) { 433 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, 434 NFS_LATTR_NOSHRINK)); 435 } 436 if (error) { 437 if (info.mrep != NULL) 438 m_freem(info.mrep); 439 goto nfsmout; 440 } 441 NULLOUT(sfp = nfsm_dissect(&info, NFSX_STATFS(info.v3))); 442 sbp->f_flag = nmp->nm_flag; 443 sbp->f_owner = nmp->nm_cred->cr_ruid; 444 445 if (info.v3) { 446 sbp->f_bsize = NFS_FABLKSIZE; 447 sbp->f_frsize = NFS_FABLKSIZE; 448 sbp->f_blocks = (fxdr_hyper(&sfp->sf_tbytes) / 449 ((u_quad_t)NFS_FABLKSIZE)); 450 sbp->f_bfree = (fxdr_hyper(&sfp->sf_fbytes) / 451 ((u_quad_t)NFS_FABLKSIZE)); 452 sbp->f_bavail = (fxdr_hyper(&sfp->sf_abytes) / 453 ((u_quad_t)NFS_FABLKSIZE)); 454 sbp->f_files = fxdr_hyper(&sfp->sf_tfiles); 455 sbp->f_ffree = fxdr_hyper(&sfp->sf_ffiles); 456 sbp->f_favail = fxdr_hyper(&sfp->sf_afiles); 457 } else { 458 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 459 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 460 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 461 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 462 sbp->f_files = 0; 463 sbp->f_ffree = 0; 464 sbp->f_favail = 0; 465 } 466 sbp->f_syncreads = 0; 467 sbp->f_syncwrites = 0; 468 sbp->f_asyncreads = 0; 469 sbp->f_asyncwrites = 0; 470 sbp->f_type = mp->mnt_vfc->vfc_typenum; 471 472 m_freem(info.mrep); 473 info.mrep = NULL; 474 nfsmout: 475 vput(vp); 476 crfree(cred); 477 lwkt_reltoken(&nmp->nm_token); 478 return (error); 479 } 480 481 /* 482 * nfs version 3 fsinfo rpc call 483 */ 484 int 485 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct thread *td) 486 { 487 struct nfsv3_fsinfo *fsp; 488 u_int32_t pref, max; 489 int error = 0, retattr; 490 u_int64_t maxfsize; 491 struct nfsm_info info; 492 493 info.v3 = 1; 494 nfsstats.rpccnt[NFSPROC_FSINFO]++; 495 nfsm_reqhead(&info, vp, NFSPROC_FSINFO, NFSX_FH(1)); 496 ERROROUT(nfsm_fhtom(&info, vp)); 497 NEGKEEPOUT(nfsm_request(&info, vp, NFSPROC_FSINFO, td, 498 nfs_vpcred(vp, ND_READ), &error)); 499 ERROROUT(nfsm_postop_attr(&info, vp, &retattr, NFS_LATTR_NOSHRINK)); 500 if (error == 0) { 501 NULLOUT(fsp = nfsm_dissect(&info, NFSX_V3FSINFO)); 502 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 503 if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE) 504 nmp->nm_wsize = roundup2(pref, NFS_FABLKSIZE); 505 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 506 if (max < nmp->nm_wsize && max > 0) { 507 nmp->nm_wsize = rounddown2(max, NFS_FABLKSIZE); 508 if (nmp->nm_wsize == 0) 509 nmp->nm_wsize = max; 510 } 511 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 512 if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE) 513 nmp->nm_rsize = roundup2(pref, NFS_FABLKSIZE); 514 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 515 if (max < nmp->nm_rsize && max > 0) { 516 nmp->nm_rsize = rounddown2(max, NFS_FABLKSIZE); 517 if (nmp->nm_rsize == 0) 518 nmp->nm_rsize = max; 519 } 520 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 521 if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ) 522 nmp->nm_readdirsize = roundup2(pref, NFS_DIRBLKSIZ); 523 if (max < nmp->nm_readdirsize && max > 0) { 524 nmp->nm_readdirsize = rounddown2(max, NFS_DIRBLKSIZ); 525 if (nmp->nm_readdirsize == 0) 526 nmp->nm_readdirsize = max; 527 } 528 maxfsize = fxdr_hyper(&fsp->fs_maxfilesize); 529 if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize) 530 nmp->nm_maxfilesize = maxfsize; 531 nmp->nm_state |= NFSSTA_GOTFSINFO; 532 533 /* 534 * Use the smaller of rsize/wsize for the biosize. 535 */ 536 if (nmp->nm_rsize < nmp->nm_wsize) 537 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_rsize; 538 else 539 nmp->nm_mountp->mnt_stat.f_iosize = nmp->nm_wsize; 540 } 541 m_freem(info.mrep); 542 info.mrep = NULL; 543 nfsmout: 544 return (error); 545 } 546 547 /* 548 * Mount a remote root fs via. nfs. This depends on the info in the 549 * nfs_diskless structure that has been filled in properly by some primary 550 * bootstrap. 551 * It goes something like this: 552 * - do enough of "ifconfig" by calling ifioctl() so that the system 553 * can talk to the server 554 * - If nfs_diskless.mygateway is filled in, use that address as 555 * a default gateway. 556 * - build the rootfs mount point and call mountnfs() to do the rest. 557 */ 558 int 559 nfs_mountroot(struct mount *mp) 560 { 561 struct mount *swap_mp; 562 struct nfsv3_diskless *nd = &nfsv3_diskless; 563 struct socket *so; 564 struct vnode *vp; 565 struct thread *td = curthread; /* XXX */ 566 int error, i; 567 u_long l; 568 char buf[128], addr[INET_ADDRSTRLEN]; 569 570 #if defined(BOOTP_NFSROOT) && defined(BOOTP) 571 bootpc_init(); /* use bootp to get nfs_diskless filled in */ 572 #endif 573 574 /* 575 * XXX time must be non-zero when we init the interface or else 576 * the arp code will wedge... 577 */ 578 while (mycpu->gd_time_seconds == 0) 579 tsleep(mycpu, 0, "arpkludge", 10); 580 581 /* 582 * The boot code may have passed us a diskless structure. 583 */ 584 kprintf("DISKLESS %d\n", nfs_diskless_valid); 585 if (nfs_diskless_valid == 1) 586 nfs_convert_diskless(); 587 588 /* 589 * NFSv3 is required. 590 */ 591 nd->root_args.flags |= NFSMNT_NFSV3 | NFSMNT_RDIRPLUS; 592 nd->swap_args.flags |= NFSMNT_NFSV3; 593 594 #define SINP(sockaddr) ((struct sockaddr_in *)(sockaddr)) 595 kprintf("nfs_mountroot: interface %s ip %s", 596 nd->myif.ifra_name, 597 kinet_ntoa(SINP(&nd->myif.ifra_addr)->sin_addr, addr)); 598 kprintf(" bcast %s", 599 kinet_ntoa(SINP(&nd->myif.ifra_broadaddr)->sin_addr, addr)); 600 kprintf(" mask %s\n", 601 kinet_ntoa(SINP(&nd->myif.ifra_mask)->sin_addr, addr)); 602 #undef SINP 603 604 /* 605 * XXX splnet, so networks will receive... 606 */ 607 crit_enter(); 608 609 /* 610 * BOOTP does not necessarily have to be compiled into the kernel 611 * for an NFS root to work. If we inherited the network 612 * configuration for PXEBOOT then pxe_setup_nfsdiskless() has figured 613 * out our interface for us and all we need to do is ifconfig the 614 * interface. We only do this if the interface has not already been 615 * ifconfig'd by e.g. BOOTP. 616 */ 617 error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, td); 618 if (error) { 619 panic("nfs_mountroot: socreate(%04x): %d", 620 nd->myif.ifra_addr.sa_family, error); 621 } 622 623 error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, proc0.p_ucred); 624 if (error) 625 panic("nfs_mountroot: SIOCAIFADDR: %d", error); 626 627 soclose(so, FNONBLOCK); 628 629 /* 630 * If the gateway field is filled in, set it as the default route. 631 */ 632 if (nd->mygateway.sin_len != 0) { 633 struct sockaddr_in mask, sin; 634 635 bzero((caddr_t)&mask, sizeof(mask)); 636 sin = mask; 637 sin.sin_family = AF_INET; 638 sin.sin_len = sizeof(sin); 639 kprintf("nfs_mountroot: gateway %s\n", 640 kinet_ntoa(nd->mygateway.sin_addr, addr)); 641 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&sin, 642 (struct sockaddr *)&nd->mygateway, 643 (struct sockaddr *)&mask, 644 RTF_UP | RTF_GATEWAY); 645 if (error) 646 kprintf("nfs_mountroot: unable to set gateway, error %d, continuing anyway\n", error); 647 } 648 649 /* 650 * Create the rootfs mount point. 651 */ 652 nd->root_args.fh = nd->root_fh; 653 nd->root_args.fhsize = nd->root_fhsize; 654 l = ntohl(nd->root_saddr.sin_addr.s_addr); 655 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 656 (l >> 24) & 0xff, (l >> 16) & 0xff, 657 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam); 658 kprintf("NFS_ROOT: %s\n",buf); 659 error = nfs_mountdiskless(buf, "/", MNT_RDONLY, &nd->root_saddr, 660 &nd->root_args, td, &vp, &mp); 661 if (error) { 662 mp->mnt_vfc->vfc_refcount--; 663 crit_exit(); 664 return (error); 665 } 666 667 swap_mp = NULL; 668 if (nd->swap_nblks) { 669 670 /* Convert to DEV_BSIZE instead of Kilobyte */ 671 nd->swap_nblks *= 2; 672 673 /* 674 * Create a fake mount point just for the swap vnode so that the 675 * swap file can be on a different server from the rootfs. 676 */ 677 nd->swap_args.fh = nd->swap_fh; 678 nd->swap_args.fhsize = nd->swap_fhsize; 679 l = ntohl(nd->swap_saddr.sin_addr.s_addr); 680 ksnprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s", 681 (l >> 24) & 0xff, (l >> 16) & 0xff, 682 (l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam); 683 kprintf("NFS SWAP: %s\n",buf); 684 vp = NULL; /* avoid gcc warnings */ 685 error = nfs_mountdiskless(buf, "/swap", 0, &nd->swap_saddr, 686 &nd->swap_args, td, &vp, &swap_mp); 687 if (error) { 688 crit_exit(); 689 return (error); 690 } 691 vfs_unbusy(swap_mp); 692 693 VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size = 694 nd->swap_nblks * DEV_BSIZE ; 695 696 /* 697 * Since the swap file is not the root dir of a file system, 698 * hack it to a regular file. 699 */ 700 vclrflags(vp, VROOT); 701 vref(vp); 702 nfs_setvtype(vp, VREG); 703 swaponvp(td, vp, nd->swap_nblks); 704 } 705 706 mp->mnt_flag |= MNT_ROOTFS; 707 708 /* 709 * This is not really an nfs issue, but it is much easier to 710 * set hostname here and then let the "/etc/rc.xxx" files 711 * mount the right /var based upon its preset value. 712 */ 713 bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN); 714 hostname[MAXHOSTNAMELEN - 1] = '\0'; 715 for (i = 0; i < MAXHOSTNAMELEN; i++) 716 if (hostname[i] == '\0') 717 break; 718 inittodr(ntohl(nd->root_time)); 719 crit_exit(); 720 return (0); 721 } 722 723 /* 724 * Internal version of mount system call for diskless setup. 725 */ 726 static int 727 nfs_mountdiskless(char *path, char *which, int mountflag, 728 struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, 729 struct vnode **vpp, struct mount **mpp) 730 { 731 struct mount *mp; 732 struct sockaddr *nam; 733 int didalloc = 0; 734 int error; 735 736 mp = *mpp; 737 738 if (mp == NULL) { 739 if ((error = vfs_rootmountalloc("nfs", path, &mp)) != 0) { 740 kprintf("nfs_mountroot: NFS not configured"); 741 return (error); 742 } 743 didalloc = 1; 744 } 745 mp->mnt_kern_flag = 0; 746 mp->mnt_flag = mountflag; 747 nam = dup_sockaddr((struct sockaddr *)sin); 748 749 #if defined(BOOTP) || defined(NFS_ROOT) 750 if (args->fhsize == 0) { 751 char *xpath = path; 752 753 kprintf("NFS_ROOT: No FH passed from loader, attempting " 754 "mount rpc..."); 755 while (*xpath && *xpath != ':') 756 ++xpath; 757 if (*xpath) 758 ++xpath; 759 args->fhsize = 0; 760 error = md_mount(sin, xpath, args->fh, &args->fhsize, args, td); 761 if (error) { 762 kprintf("failed error %d.\n", error); 763 goto haderror; 764 } 765 kprintf("success!\n"); 766 } 767 #endif 768 769 if ((error = mountnfs(args, mp, nam, which, path, vpp)) != 0) { 770 #if defined(BOOTP) || defined(NFS_ROOT) 771 haderror: 772 #endif 773 kprintf("nfs_mountroot: mount %s on %s: %d", path, which, error); 774 mp->mnt_vfc->vfc_refcount--; 775 if (didalloc) 776 kfree(mp, M_MOUNT); 777 kfree(nam, M_SONAME); 778 return (error); 779 } 780 *mpp = mp; 781 return (0); 782 } 783 784 static void 785 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp) 786 { 787 int adjsock; 788 int maxio; 789 790 crit_enter(); 791 /* 792 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes 793 * no sense in that context. 794 */ 795 if (nmp->nm_sotype == SOCK_STREAM) { 796 nmp->nm_flag &= ~NFSMNT_NOCONN; 797 argp->flags &= ~NFSMNT_NOCONN; 798 } 799 800 /* 801 * readdirplus is NFSv3 only. 802 */ 803 if ((argp->flags & NFSMNT_NFSV3) == 0) { 804 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 805 argp->flags &= ~NFSMNT_RDIRPLUS; 806 } 807 808 /* 809 * Re-bind if rsrvd port flag has changed 810 */ 811 adjsock = (nmp->nm_flag & NFSMNT_RESVPORT) != 812 (argp->flags & NFSMNT_RESVPORT); 813 814 /* Update flags atomically. Don't change the lock bits. */ 815 nmp->nm_flag = argp->flags | nmp->nm_flag; 816 crit_exit(); 817 818 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 819 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 820 if (nmp->nm_timeo < NFS_MINTIMEO) 821 nmp->nm_timeo = NFS_MINTIMEO; 822 else if (nmp->nm_timeo > NFS_MAXTIMEO) 823 nmp->nm_timeo = NFS_MAXTIMEO; 824 } 825 826 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) { 827 nmp->nm_retry = argp->retrans; 828 if (nmp->nm_retry > NFS_MAXREXMIT) 829 nmp->nm_retry = NFS_MAXREXMIT; 830 } 831 832 /* 833 * These parameters effect the buffer cache and cannot be changed 834 * once we've successfully mounted. 835 */ 836 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 837 maxio = nfs_iosize(argp->flags & NFSMNT_NFSV3, nmp->nm_sotype); 838 839 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 840 nmp->nm_wsize = argp->wsize; 841 /* Round down to multiple of blocksize */ 842 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 843 if (nmp->nm_wsize <= 0) 844 nmp->nm_wsize = NFS_FABLKSIZE; 845 } 846 if (nmp->nm_wsize > maxio) 847 nmp->nm_wsize = maxio; 848 if (nmp->nm_wsize > MAXBSIZE) 849 nmp->nm_wsize = MAXBSIZE; 850 851 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 852 nmp->nm_rsize = argp->rsize; 853 /* Round down to multiple of blocksize */ 854 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 855 if (nmp->nm_rsize <= 0) 856 nmp->nm_rsize = NFS_FABLKSIZE; 857 } 858 if (nmp->nm_rsize > maxio) 859 nmp->nm_rsize = maxio; 860 if (nmp->nm_rsize > MAXBSIZE) 861 nmp->nm_rsize = MAXBSIZE; 862 863 if ((argp->flags & NFSMNT_READDIRSIZE) && 864 argp->readdirsize > 0) { 865 nmp->nm_readdirsize = argp->readdirsize; 866 } 867 if (nmp->nm_readdirsize > maxio) 868 nmp->nm_readdirsize = maxio; 869 if (nmp->nm_readdirsize > nmp->nm_rsize) 870 nmp->nm_readdirsize = nmp->nm_rsize; 871 } 872 873 if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0) 874 nmp->nm_acregmin = argp->acregmin; 875 else 876 nmp->nm_acregmin = NFS_MINATTRTIMO; 877 if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0) 878 nmp->nm_acregmax = argp->acregmax; 879 else 880 nmp->nm_acregmax = NFS_MAXATTRTIMO; 881 if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0) 882 nmp->nm_acdirmin = argp->acdirmin; 883 else 884 nmp->nm_acdirmin = NFS_MINDIRATTRTIMO; 885 if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0) 886 nmp->nm_acdirmax = argp->acdirmax; 887 else 888 nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO; 889 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 890 nmp->nm_acdirmin = nmp->nm_acdirmax; 891 if (nmp->nm_acregmin > nmp->nm_acregmax) 892 nmp->nm_acregmin = nmp->nm_acregmax; 893 894 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) { 895 if (argp->maxgrouplist <= NFS_MAXGRPS) 896 nmp->nm_numgrps = argp->maxgrouplist; 897 else 898 nmp->nm_numgrps = NFS_MAXGRPS; 899 } 900 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) { 901 if (argp->readahead <= NFS_MAXRAHEAD) 902 nmp->nm_readahead = argp->readahead; 903 else 904 nmp->nm_readahead = NFS_MAXRAHEAD; 905 } 906 if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1) { 907 if (argp->deadthresh <= NFS_NEVERDEAD) 908 nmp->nm_deadthresh = argp->deadthresh; 909 else 910 nmp->nm_deadthresh = NFS_NEVERDEAD; 911 } 912 913 if (nmp->nm_so && adjsock) { 914 nfs_safedisconnect(nmp); 915 if (nmp->nm_sotype == SOCK_DGRAM) 916 while (nfs_connect(nmp, NULL)) { 917 kprintf("nfs_args: retrying connect\n"); 918 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 919 } 920 } 921 } 922 923 /* 924 * VFS Operations. 925 * 926 * mount system call 927 * It seems a bit dumb to copyinstr() the host and path here and then 928 * bcopy() them in mountnfs(), but I wanted to detect errors before 929 * doing the sockargs() call because sockargs() allocates an mbuf and 930 * an error after that means that I have to release the mbuf. 931 */ 932 /* ARGSUSED */ 933 static int 934 nfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 935 { 936 int error; 937 struct nfs_args args; 938 struct sockaddr *nam; 939 struct vnode *vp; 940 char pth[MNAMELEN], hst[MNAMELEN]; 941 size_t len; 942 u_char nfh[NFSX_V3FHMAX]; 943 944 if (path == NULL) { 945 nfs_mountroot(mp); 946 return (0); 947 } 948 error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args)); 949 if (error) 950 return (error); 951 if (args.version != NFS_ARGSVERSION) { 952 #ifdef COMPAT_PRELITE2 953 /* 954 * If the argument version is unknown, then assume the 955 * caller is a pre-lite2 4.4BSD client and convert its 956 * arguments. 957 */ 958 struct onfs_args oargs; 959 error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args)); 960 if (error) 961 return (error); 962 nfs_convert_oargs(&args,&oargs); 963 #else /* !COMPAT_PRELITE2 */ 964 return (EPROGMISMATCH); 965 #endif /* COMPAT_PRELITE2 */ 966 } 967 if (mp->mnt_flag & MNT_UPDATE) { 968 struct nfsmount *nmp = VFSTONFS(mp); 969 970 if (nmp == NULL) 971 return (EIO); 972 /* 973 * When doing an update, we can't change from or to 974 * v3, or change cookie translation, or rsize or wsize. 975 */ 976 args.flags &= ~(NFSMNT_NFSV3 | NFSMNT_RSIZE | NFSMNT_WSIZE); 977 args.flags |= nmp->nm_flag & (NFSMNT_NFSV3); 978 nfs_decode_args(nmp, &args); 979 return (0); 980 } 981 982 /* 983 * Make the nfs_ip_paranoia sysctl serve as the default connection 984 * or no-connection mode for those protocols that support 985 * no-connection mode (the flag will be cleared later for protocols 986 * that do not support no-connection mode). This will allow a client 987 * to receive replies from a different IP then the request was 988 * sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid), 989 * not 0. 990 */ 991 if (nfs_ip_paranoia == 0) 992 args.flags |= NFSMNT_NOCONN; 993 if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) 994 return (EINVAL); 995 error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); 996 if (error) 997 return (error); 998 error = copyinstr(path, pth, MNAMELEN-1, &len); 999 if (error) 1000 return (error); 1001 bzero(&pth[len], MNAMELEN - len); 1002 error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); 1003 if (error) 1004 return (error); 1005 bzero(&hst[len], MNAMELEN - len); 1006 /* sockargs() call must be after above copyin() calls */ 1007 error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); 1008 if (error) 1009 return (error); 1010 args.fh = nfh; 1011 error = mountnfs(&args, mp, nam, pth, hst, &vp); 1012 return (error); 1013 } 1014 1015 /* 1016 * Common code for mount and mountroot 1017 */ 1018 static int 1019 mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam, 1020 char *pth, char *hst, struct vnode **vpp) 1021 { 1022 struct nfsmount *nmp; 1023 struct nfsnode *np; 1024 int error; 1025 int rxcpu; 1026 int txcpu; 1027 1028 if (mp->mnt_flag & MNT_UPDATE) { 1029 nmp = VFSTONFS(mp); 1030 /* update paths, file handles, etc, here XXX */ 1031 kfree(nam, M_SONAME); 1032 return (0); 1033 } else { 1034 nmp = objcache_get(nfsmount_objcache, M_WAITOK); 1035 bzero((caddr_t)nmp, sizeof (struct nfsmount)); 1036 mtx_init_flags(&nmp->nm_rxlock, "nfsrx", MTXF_NOCOLLSTATS); 1037 mtx_init_flags(&nmp->nm_txlock, "nfstx", MTXF_NOCOLLSTATS); 1038 TAILQ_INIT(&nmp->nm_uidlruhead); 1039 TAILQ_INIT(&nmp->nm_bioq); 1040 TAILQ_INIT(&nmp->nm_reqq); 1041 TAILQ_INIT(&nmp->nm_reqtxq); 1042 TAILQ_INIT(&nmp->nm_reqrxq); 1043 mp->mnt_data = (qaddr_t)nmp; 1044 lwkt_token_init(&nmp->nm_token, "nfs_token"); 1045 } 1046 vfs_getnewfsid(mp); 1047 nmp->nm_mountp = mp; 1048 mp->mnt_kern_flag |= MNTK_ALL_MPSAFE; 1049 mp->mnt_kern_flag |= MNTK_THR_SYNC; /* new vsyncscan semantics */ 1050 1051 lwkt_gettoken(&nmp->nm_token); 1052 1053 /* 1054 * V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too 1055 * high, depending on whether we end up with negative offsets in 1056 * the client or server somewhere. 2GB-1 may be safer. 1057 * 1058 * For V3, nfs_fsinfo will adjust this as necessary. Assume maximum 1059 * that we can handle until we find out otherwise. Note that seek 1060 * offsets are signed. 1061 */ 1062 if ((argp->flags & NFSMNT_NFSV3) == 0) 1063 nmp->nm_maxfilesize = 0xffffffffLL; 1064 else 1065 nmp->nm_maxfilesize = 0x7fffffffffffffffLL; 1066 1067 nmp->nm_timeo = NFS_TIMEO; 1068 nmp->nm_retry = NFS_RETRANS; 1069 nmp->nm_wsize = nfs_iosize(argp->flags & NFSMNT_NFSV3, argp->sotype); 1070 nmp->nm_rsize = nmp->nm_wsize; 1071 nmp->nm_readdirsize = NFS_READDIRSIZE; 1072 nmp->nm_numgrps = NFS_MAXGRPS; 1073 nmp->nm_readahead = NFS_DEFRAHEAD; 1074 nmp->nm_deadthresh = NFS_DEADTHRESH; 1075 nmp->nm_fhsize = argp->fhsize; 1076 bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize); 1077 bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN); 1078 nmp->nm_nam = nam; 1079 /* Set up the sockets and per-host congestion */ 1080 nmp->nm_sotype = argp->sotype; 1081 nmp->nm_soproto = argp->proto; 1082 nmp->nm_cred = crhold(proc0.p_ucred); 1083 1084 nfs_decode_args(nmp, argp); 1085 1086 /* 1087 * For Connection based sockets (TCP,...) defer the connect until 1088 * the first request, in case the server is not responding. 1089 */ 1090 if (nmp->nm_sotype == SOCK_DGRAM && 1091 (error = nfs_connect(nmp, NULL))) 1092 goto bad; 1093 1094 /* 1095 * This is silly, but it has to be set so that vinifod() works. 1096 * We do not want to do an nfs_statfs() here since we can get 1097 * stuck on a dead server and we are holding a lock on the mount 1098 * point. 1099 */ 1100 mp->mnt_stat.f_iosize = 1101 nfs_iosize(nmp->nm_flag & NFSMNT_NFSV3, nmp->nm_sotype); 1102 1103 /* 1104 * Install vop_ops for our vnops 1105 */ 1106 vfs_add_vnodeops(mp, &nfsv2_vnode_vops, &mp->mnt_vn_norm_ops); 1107 vfs_add_vnodeops(mp, &nfsv2_spec_vops, &mp->mnt_vn_spec_ops); 1108 vfs_add_vnodeops(mp, &nfsv2_fifo_vops, &mp->mnt_vn_fifo_ops); 1109 1110 /* 1111 * A reference count is needed on the nfsnode representing the 1112 * remote root. If this object is not persistent, then backward 1113 * traversals of the mount point (i.e. "..") will not work if 1114 * the nfsnode gets flushed out of the cache. Ufs does not have 1115 * this problem, because one can identify root inodes by their 1116 * number == UFS_ROOTINO (2). 1117 */ 1118 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 1119 if (error) 1120 goto bad; 1121 *vpp = NFSTOV(np); 1122 1123 /* 1124 * Retrieval of mountpoint attributes is delayed until nfs_rot 1125 * or nfs_statfs are first called. This will happen either when 1126 * we first traverse the mount point or if somebody does a df(1). 1127 * 1128 * NFSSTA_GOTFSINFO is used to flag if we have successfully 1129 * retrieved mountpoint attributes. In the case of NFSv3 we 1130 * also flag static fsinfo. 1131 */ 1132 if (*vpp != NULL) 1133 (*vpp)->v_type = VNON; 1134 1135 /* 1136 * Lose the lock but keep the ref. 1137 */ 1138 vn_unlock(*vpp); 1139 lwkt_gettoken(&nfs_token); 1140 TAILQ_INSERT_TAIL(&nfs_mountq, nmp, nm_entry); 1141 lwkt_reltoken(&nfs_token); 1142 1143 switch(ncpus) { 1144 case 0: 1145 case 1: 1146 rxcpu = 0; 1147 txcpu = 0; 1148 break; 1149 case 2: 1150 rxcpu = 0; 1151 txcpu = 1; 1152 break; 1153 default: 1154 rxcpu = -1; 1155 txcpu = -1; 1156 break; 1157 } 1158 1159 /* 1160 * Start the reader and writer threads. 1161 */ 1162 lwkt_create(nfssvc_iod_reader, nmp, &nmp->nm_rxthread, 1163 NULL, 0, rxcpu, "nfsiod_rx"); 1164 lwkt_create(nfssvc_iod_writer, nmp, &nmp->nm_txthread, 1165 NULL, 0, txcpu, "nfsiod_tx"); 1166 lwkt_reltoken(&nmp->nm_token); 1167 return (0); 1168 bad: 1169 nfs_disconnect(nmp); 1170 lwkt_reltoken(&nmp->nm_token); 1171 nfs_free_mount(nmp); 1172 return (error); 1173 } 1174 1175 /* 1176 * unmount system call 1177 */ 1178 static int 1179 nfs_unmount(struct mount *mp, int mntflags) 1180 { 1181 struct nfsmount *nmp; 1182 int error, flags = 0; 1183 1184 nmp = VFSTONFS(mp); 1185 lwkt_gettoken(&nmp->nm_token); 1186 if (mntflags & MNT_FORCE) { 1187 flags |= FORCECLOSE; 1188 nmp->nm_flag |= NFSMNT_FORCE; 1189 } 1190 1191 /* 1192 * Goes something like this.. 1193 * - Call vflush() to clear out vnodes for this file system 1194 * - Close the socket 1195 * - Free up the data structures 1196 */ 1197 /* In the forced case, cancel any outstanding requests. */ 1198 if (flags & FORCECLOSE) { 1199 error = nfs_nmcancelreqs(nmp); 1200 if (error) { 1201 kprintf("NFS: %s: Unable to cancel all requests\n", 1202 mp->mnt_stat.f_mntfromname); 1203 /* continue anyway */ 1204 } 1205 } 1206 1207 /* 1208 * Must handshake with nfs_clientd() if it is active. XXX 1209 */ 1210 nmp->nm_state |= NFSSTA_DISMINPROG; 1211 1212 /* 1213 * We hold 1 extra ref on the root vnode; see comment in mountnfs(). 1214 * 1215 * If this doesn't work and we are doing a forced unmount we continue 1216 * anyway. 1217 */ 1218 error = vflush(mp, 1, flags); 1219 if (error) { 1220 nmp->nm_state &= ~NFSSTA_DISMINPROG; 1221 if ((flags & FORCECLOSE) == 0) { 1222 lwkt_reltoken(&nmp->nm_token); 1223 return (error); 1224 } 1225 } 1226 1227 /* 1228 * We are now committed to the unmount. 1229 * For NQNFS, let the server daemon free the nfsmount structure. 1230 */ 1231 if (nmp->nm_flag & NFSMNT_KERB) 1232 nmp->nm_state |= NFSSTA_DISMNT; 1233 nfssvc_iod_stop1(nmp); 1234 nfs_disconnect(nmp); 1235 nfssvc_iod_stop2(nmp); 1236 1237 lwkt_gettoken(&nfs_token); 1238 TAILQ_REMOVE(&nfs_mountq, nmp, nm_entry); 1239 lwkt_reltoken(&nfs_token); 1240 1241 lwkt_reltoken(&nmp->nm_token); 1242 1243 if ((nmp->nm_flag & NFSMNT_KERB) == 0) { 1244 nfs_free_mount(nmp); 1245 } 1246 return (0); 1247 } 1248 1249 void 1250 nfs_free_mount(struct nfsmount *nmp) 1251 { 1252 if (nmp->nm_cred) { 1253 crfree(nmp->nm_cred); 1254 nmp->nm_cred = NULL; 1255 } 1256 if (nmp->nm_nam) { 1257 kfree(nmp->nm_nam, M_SONAME); 1258 nmp->nm_nam = NULL; 1259 } 1260 objcache_put(nfsmount_objcache, nmp); 1261 } 1262 1263 /* 1264 * Return root of a filesystem 1265 */ 1266 static int 1267 nfs_root(struct mount *mp, struct vnode **vpp) 1268 { 1269 struct vnode *vp; 1270 struct nfsmount *nmp; 1271 struct vattr attrs; 1272 struct nfsnode *np; 1273 int error; 1274 1275 nmp = VFSTONFS(mp); 1276 lwkt_gettoken(&nmp->nm_token); 1277 error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, NULL); 1278 if (error) { 1279 lwkt_reltoken(&nmp->nm_token); 1280 return (error); 1281 } 1282 vp = NFSTOV(np); 1283 1284 /* 1285 * Get transfer parameters and root vnode attributes 1286 * 1287 * NOTE: nfs_fsinfo() is expected to override the default 1288 * f_iosize we set. 1289 */ 1290 if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 1291 if (nmp->nm_flag & NFSMNT_NFSV3) { 1292 mp->mnt_stat.f_iosize = nfs_iosize(1, nmp->nm_sotype); 1293 error = nfs_fsinfo(nmp, vp, curthread); 1294 } else { 1295 if ((error = VOP_GETATTR(vp, &attrs)) == 0) 1296 nmp->nm_state |= NFSSTA_GOTFSINFO; 1297 1298 } 1299 } else { 1300 /* 1301 * The root vnode is usually cached by the namecache so do not 1302 * try to avoid going over the wire even if we have previous 1303 * information cached. A stale NFS mount can loop 1304 * forever resolving the root vnode if we return no-error when 1305 * there is in fact an error. 1306 */ 1307 np->n_attrstamp = 0; 1308 error = VOP_GETATTR(vp, &attrs); 1309 } 1310 if (vp->v_type == VNON) 1311 nfs_setvtype(vp, VDIR); 1312 vsetflags(vp, VROOT); 1313 if (error) 1314 vput(vp); 1315 else 1316 *vpp = vp; 1317 lwkt_reltoken(&nmp->nm_token); 1318 return (error); 1319 } 1320 1321 struct scaninfo { 1322 int rescan; 1323 int waitfor; 1324 int allerror; 1325 }; 1326 1327 static int nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data); 1328 1329 /* 1330 * Flush out the buffer cache 1331 */ 1332 /* ARGSUSED */ 1333 static int 1334 nfs_sync(struct mount *mp, int waitfor) 1335 { 1336 struct nfsmount *nmp = VFSTONFS(mp); 1337 struct scaninfo scaninfo; 1338 int error; 1339 1340 scaninfo.rescan = 1; 1341 scaninfo.waitfor = waitfor; 1342 scaninfo.allerror = 0; 1343 1344 /* 1345 * Force stale buffer cache information to be flushed. 1346 */ 1347 lwkt_gettoken(&nmp->nm_token); 1348 error = 0; 1349 if ((waitfor & MNT_LAZY) == 0) { 1350 while (error == 0 && scaninfo.rescan) { 1351 scaninfo.rescan = 0; 1352 error = vsyncscan(mp, VMSC_GETVP, 1353 nfs_sync_scan2, &scaninfo); 1354 } 1355 } 1356 lwkt_reltoken(&nmp->nm_token); 1357 return(error); 1358 } 1359 1360 static int 1361 nfs_sync_scan2(struct mount *mp, struct vnode *vp, void *data) 1362 { 1363 struct scaninfo *info = data; 1364 int error; 1365 1366 if (vp->v_type == VNON || vp->v_type == VBAD) 1367 return(0); 1368 error = VOP_FSYNC(vp, info->waitfor, 0); 1369 if (error) 1370 info->allerror = error; 1371 return(0); 1372 } 1373 1374