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sys/nfs/nfs_vfsops.c
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1 /* $OpenBSD: nfs_vfsops.c,v 1.127 2022/08/12 14:30:53 visa Exp $ */ 2 /* $NetBSD: nfs_vfsops.c,v 1.46.4.1 1996/05/25 22:40:35 fvdl Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1995 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95 36 */ 37 38 #include <sys/param.h> 39 #include <sys/conf.h> 40 #include <sys/ioctl.h> 41 #include <sys/signal.h> 42 #include <sys/proc.h> 43 #include <sys/namei.h> 44 #include <sys/vnode.h> 45 #include <sys/lock.h> 46 #include <sys/kernel.h> 47 #include <sys/mount.h> 48 #include <sys/swap.h> 49 #include <sys/buf.h> 50 #include <sys/mbuf.h> 51 #include <sys/dirent.h> 52 #include <sys/socket.h> 53 #include <sys/socketvar.h> 54 #include <sys/systm.h> 55 #include <sys/sysctl.h> 56 #include <sys/queue.h> 57 58 #include <netinet/in.h> 59 60 #include <nfs/rpcv2.h> 61 #include <nfs/nfsproto.h> 62 #include <nfs/nfsnode.h> 63 #include <nfs/nfs.h> 64 #include <nfs/nfsmount.h> 65 #include <nfs/xdr_subs.h> 66 #include <nfs/nfsm_subs.h> 67 #include <nfs/nfsdiskless.h> 68 #include <nfs/nfs_var.h> 69 70 extern struct nfsstats nfsstats; 71 extern int nfs_ticks; 72 extern u_int32_t nfs_procids[NFS_NPROCS]; 73 74 int nfs_sysctl(int *, u_int, void *, size_t *, void *, size_t, 75 struct proc *); 76 int nfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **); 77 struct mount *nfs_mount_diskless(struct nfs_dlmount *, char *, int, 78 struct vnode **, struct proc *p); 79 int mountnfs(struct nfs_args *, struct mount *, struct mbuf *, 80 const char *, char *, struct vnode **, struct proc *p); 81 int nfs_quotactl(struct mount *, int, uid_t, caddr_t, struct proc *); 82 int nfs_root(struct mount *, struct vnode **); 83 int nfs_start(struct mount *, int, struct proc *); 84 int nfs_statfs(struct mount *, struct statfs *, struct proc *); 85 int nfs_sync(struct mount *, int, int, struct ucred *, struct proc *); 86 int nfs_unmount(struct mount *, int, struct proc *); 87 void nfs_reaper(void *); 88 int nfs_vget(struct mount *, ino_t, struct vnode **); 89 int nfs_vptofh(struct vnode *, struct fid *); 90 int nfs_mountroot(void); 91 void nfs_decode_args(struct nfsmount *, struct nfs_args *, 92 struct nfs_args *); 93 int nfs_fhtovp(struct mount *, struct fid *, struct vnode **); 94 95 /* 96 * nfs vfs operations. 97 */ 98 const struct vfsops nfs_vfsops = { 99 .vfs_mount = nfs_mount, 100 .vfs_start = nfs_start, 101 .vfs_unmount = nfs_unmount, 102 .vfs_root = nfs_root, 103 .vfs_quotactl = nfs_quotactl, 104 .vfs_statfs = nfs_statfs, 105 .vfs_sync = nfs_sync, 106 .vfs_vget = nfs_vget, 107 .vfs_fhtovp = nfs_fhtovp, 108 .vfs_vptofh = nfs_vptofh, 109 .vfs_init = nfs_vfs_init, 110 .vfs_sysctl = nfs_sysctl, 111 .vfs_checkexp = nfs_checkexp, 112 }; 113 114 /* 115 * nfs statfs call 116 */ 117 int 118 nfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) 119 { 120 struct vnode *vp; 121 struct nfs_statfs *sfp = NULL; 122 struct nfsm_info info; 123 u_int32_t *tl; 124 int32_t t1; 125 caddr_t cp2; 126 struct nfsmount *nmp = VFSTONFS(mp); 127 int error = 0, retattr; 128 struct ucred *cred; 129 u_quad_t tquad; 130 131 info.nmi_v3 = (nmp->nm_flag & NFSMNT_NFSV3); 132 133 error = nfs_root(mp, &vp); 134 if (error) 135 return (error); 136 cred = crget(); 137 cred->cr_ngroups = 0; 138 if (info.nmi_v3 && (nmp->nm_flag & NFSMNT_GOTFSINFO) == 0) 139 (void)nfs_fsinfo(nmp, vp, cred, p); 140 nfsstats.rpccnt[NFSPROC_FSSTAT]++; 141 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(info.nmi_v3)); 142 nfsm_fhtom(&info, vp, info.nmi_v3); 143 144 info.nmi_procp = p; 145 info.nmi_cred = cred; 146 error = nfs_request(vp, NFSPROC_FSSTAT, &info); 147 if (info.nmi_v3) 148 nfsm_postop_attr(vp, retattr); 149 if (error) { 150 m_freem(info.nmi_mrep); 151 goto nfsmout; 152 } 153 154 nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(info.nmi_v3)); 155 sbp->f_iosize = min(nmp->nm_rsize, nmp->nm_wsize); 156 if (info.nmi_v3) { 157 sbp->f_bsize = NFS_FABLKSIZE; 158 tquad = fxdr_hyper(&sfp->sf_tbytes); 159 sbp->f_blocks = tquad / (u_quad_t)NFS_FABLKSIZE; 160 tquad = fxdr_hyper(&sfp->sf_fbytes); 161 sbp->f_bfree = tquad / (u_quad_t)NFS_FABLKSIZE; 162 tquad = fxdr_hyper(&sfp->sf_abytes); 163 sbp->f_bavail = (quad_t)tquad / (quad_t)NFS_FABLKSIZE; 164 165 tquad = fxdr_hyper(&sfp->sf_tfiles); 166 sbp->f_files = tquad; 167 tquad = fxdr_hyper(&sfp->sf_ffiles); 168 sbp->f_ffree = tquad; 169 sbp->f_favail = tquad; 170 } else { 171 sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize); 172 sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks); 173 sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree); 174 sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail); 175 sbp->f_files = 0; 176 sbp->f_ffree = 0; 177 sbp->f_favail = 0; 178 } 179 copy_statfs_info(sbp, mp); 180 m_freem(info.nmi_mrep); 181 nfsmout: 182 vput(vp); 183 crfree(cred); 184 return (error); 185 } 186 187 /* 188 * nfs version 3 fsinfo rpc call 189 */ 190 int 191 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred, 192 struct proc *p) 193 { 194 struct nfsv3_fsinfo *fsp; 195 struct nfsm_info info; 196 int32_t t1; 197 u_int32_t *tl, pref, max; 198 caddr_t cp2; 199 int error = 0, retattr; 200 201 nfsstats.rpccnt[NFSPROC_FSINFO]++; 202 info.nmi_mb = info.nmi_mreq = nfsm_reqhead(NFSX_FH(1)); 203 nfsm_fhtom(&info, vp, 1); 204 205 info.nmi_procp = p; 206 info.nmi_cred = cred; 207 error = nfs_request(vp, NFSPROC_FSINFO, &info); 208 209 nfsm_postop_attr(vp, retattr); 210 if (error) { 211 m_freem(info.nmi_mrep); 212 goto nfsmout; 213 } 214 215 nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO); 216 pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref); 217 if (pref < nmp->nm_wsize) 218 nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) & 219 ~(NFS_FABLKSIZE - 1); 220 max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax); 221 if (max < nmp->nm_wsize) { 222 nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1); 223 if (nmp->nm_wsize == 0) 224 nmp->nm_wsize = max; 225 } 226 pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref); 227 if (pref < nmp->nm_rsize) 228 nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) & 229 ~(NFS_FABLKSIZE - 1); 230 max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax); 231 if (max < nmp->nm_rsize) { 232 nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1); 233 if (nmp->nm_rsize == 0) 234 nmp->nm_rsize = max; 235 } 236 pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref); 237 if (pref < nmp->nm_readdirsize) 238 nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) & 239 ~(NFS_DIRBLKSIZ - 1); 240 if (max < nmp->nm_readdirsize) { 241 nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1); 242 if (nmp->nm_readdirsize == 0) 243 nmp->nm_readdirsize = max; 244 } 245 nmp->nm_flag |= NFSMNT_GOTFSINFO; 246 247 m_freem(info.nmi_mrep); 248 nfsmout: 249 return (error); 250 } 251 252 struct nfs_diskless nfs_diskless; 253 254 /* 255 * Mount a remote root fs via. NFS. It goes like this: 256 * - Call nfs_boot_init() to fill in the nfs_diskless struct 257 * (using RARP, bootparam RPC, mountd RPC) 258 * - hand craft the swap nfs vnode hanging off a fake mount point 259 * if swdevt[0].sw_dev == NODEV 260 * - build the rootfs mount point and call mountnfs() to do the rest. 261 */ 262 int 263 nfs_mountroot(void) 264 { 265 struct vattr attr; 266 struct mount *mp; 267 struct vnode *vp; 268 struct proc *procp; 269 long n; 270 int error; 271 272 procp = curproc; /* XXX */ 273 274 /* 275 * Call nfs_boot_init() to fill in the nfs_diskless struct. 276 * Side effect: Finds and configures a network interface. 277 */ 278 nfs_boot_init(&nfs_diskless, procp); 279 280 /* 281 * Create the root mount point. 282 */ 283 if (nfs_boot_getfh(&nfs_diskless.nd_boot, "root", &nfs_diskless.nd_root, -1)) 284 panic("nfs_mountroot: root"); 285 mp = nfs_mount_diskless(&nfs_diskless.nd_root, "/", 0, &vp, procp); 286 printf("root on %s\n", nfs_diskless.nd_root.ndm_host); 287 288 /* 289 * Link it into the mount list. 290 */ 291 TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); 292 rootvp = vp; 293 vfs_unbusy(mp); 294 295 /* Get root attributes (for the time). */ 296 error = VOP_GETATTR(rootvp, &attr, procp->p_ucred, procp); 297 if (error) panic("nfs_mountroot: getattr for root"); 298 n = attr.va_atime.tv_sec; 299 #ifdef DEBUG 300 printf("root time: 0x%lx\n", n); 301 #endif 302 inittodr(n); 303 304 #ifdef notyet 305 /* Set up swap credentials. */ 306 proc0.p_ucred->cr_uid = ntohl(nfs_diskless.swap_ucred.cr_uid); 307 proc0.p_ucred->cr_gid = ntohl(nfs_diskless.swap_ucred.cr_gid); 308 if ((proc0.p_ucred->cr_ngroups = ntohs(nfs_diskless.swap_ucred.cr_ngroups)) > 309 NGROUPS_MAX) 310 proc0.p_ucred->cr_ngroups = NGROUPS_MAX; 311 for (i = 0; i < proc0.p_ucred->cr_ngroups; i++) 312 proc0.p_ucred->cr_groups[i] = ntohl(nfs_diskless.swap_ucred.cr_groups[i]); 313 #endif 314 315 /* 316 * "Mount" the swap device. 317 * 318 * On a "dataless" configuration (swap on disk) we will have: 319 * (swdevt[0].sw_dev != NODEV) identifying the swap device. 320 */ 321 if (swdevt[0].sw_dev != NODEV) { 322 if (bdevvp(swapdev, &swapdev_vp)) 323 panic("nfs_mountroot: can't setup swap vp"); 324 printf("swap on device 0x%x\n", swdevt[0].sw_dev); 325 return (0); 326 } 327 328 /* 329 * If swapping to an nfs node: (swdevt[0].sw_dev == NODEV) 330 * Create a fake mount point just for the swap vnode so that the 331 * swap file can be on a different server from the rootfs. 332 * 333 * Wait 5 retries, finally no swap is cool. -mickey 334 */ 335 error = nfs_boot_getfh(&nfs_diskless.nd_boot, "swap", &nfs_diskless.nd_swap, 5); 336 if (!error) { 337 mp = nfs_mount_diskless(&nfs_diskless.nd_swap, "/swap", 0, &vp, 338 procp); 339 vfs_unbusy(mp); 340 341 /* 342 * Since the swap file is not the root dir of a file system, 343 * hack it to a regular file. 344 */ 345 vp->v_type = VREG; 346 vp->v_flag = 0; 347 348 /* 349 * Next line is a hack to make swapmount() work on NFS 350 * swap files. 351 */ 352 swdevt[0].sw_dev = NETDEV; 353 /* end hack */ 354 nfs_diskless.sw_vp = vp; 355 356 /* 357 * Find out how large the swap file is. 358 */ 359 error = VOP_GETATTR(vp, &attr, procp->p_ucred, procp); 360 if (error) 361 printf("nfs_mountroot: getattr for swap\n"); 362 n = (long) (attr.va_size >> DEV_BSHIFT); 363 364 printf("swap on %s\n", nfs_diskless.nd_swap.ndm_host); 365 #ifdef DEBUG 366 printf("swap size: 0x%lx (blocks)\n", n); 367 #endif 368 return (0); 369 } 370 371 printf("WARNING: no swap\n"); 372 swdevt[0].sw_dev = NODEV; 373 return (0); 374 } 375 376 /* 377 * Internal version of mount system call for diskless setup. 378 */ 379 struct mount * 380 nfs_mount_diskless(struct nfs_dlmount *ndmntp, char *mntname, int mntflag, 381 struct vnode **vpp, struct proc *p) 382 { 383 struct mount *mp; 384 struct mbuf *m; 385 int error; 386 387 if (vfs_rootmountalloc("nfs", mntname, &mp)) 388 panic("nfs_mount_diskless: vfs_rootmountalloc failed"); 389 mp->mnt_flag |= mntflag; 390 391 /* Get mbuf for server sockaddr. */ 392 m = m_get(M_WAIT, MT_SONAME); 393 bcopy(ndmntp->ndm_args.addr, mtod(m, caddr_t), 394 (m->m_len = ndmntp->ndm_args.addr->sa_len)); 395 396 error = mountnfs(&ndmntp->ndm_args, mp, m, mntname, 397 ndmntp->ndm_args.hostname, vpp, p); 398 if (error) 399 panic("nfs_mountroot: mount %s failed: %d", mntname, error); 400 401 return (mp); 402 } 403 404 void 405 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, 406 struct nfs_args *nargp) 407 { 408 int adjsock = 0; 409 int maxio; 410 411 #if 0 412 /* Re-bind if rsrvd port requested and wasn't on one */ 413 adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT) 414 && (argp->flags & NFSMNT_RESVPORT); 415 #endif 416 /* Also re-bind if we're switching to/from a connected UDP socket */ 417 adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) != 418 (argp->flags & NFSMNT_NOCONN)); 419 420 nmp->nm_flag = 421 (argp->flags & ~NFSMNT_INTERNAL) | (nmp->nm_flag & NFSMNT_INTERNAL); 422 423 if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) { 424 nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10; 425 if (nmp->nm_timeo < NFS_MINTIMEO) 426 nmp->nm_timeo = NFS_MINTIMEO; 427 else if (nmp->nm_timeo > NFS_MAXTIMEO) 428 nmp->nm_timeo = NFS_MAXTIMEO; 429 } 430 431 if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) 432 nmp->nm_retry = MIN(argp->retrans, NFS_MAXREXMIT); 433 if (!(nmp->nm_flag & NFSMNT_SOFT)) 434 nmp->nm_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 435 436 if (argp->flags & NFSMNT_NFSV3) { 437 if (argp->sotype == SOCK_DGRAM) 438 maxio = NFS_MAXDGRAMDATA; 439 else 440 maxio = NFS_MAXDATA; 441 } else 442 maxio = NFS_V2MAXDATA; 443 444 if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) { 445 int osize = nmp->nm_wsize; 446 nmp->nm_wsize = argp->wsize; 447 /* Round down to multiple of blocksize */ 448 nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1); 449 if (nmp->nm_wsize <= 0) 450 nmp->nm_wsize = NFS_FABLKSIZE; 451 adjsock |= (nmp->nm_wsize != osize); 452 } 453 if (nmp->nm_wsize > maxio) 454 nmp->nm_wsize = maxio; 455 if (nmp->nm_wsize > MAXBSIZE) 456 nmp->nm_wsize = MAXBSIZE; 457 458 if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) { 459 int osize = nmp->nm_rsize; 460 nmp->nm_rsize = argp->rsize; 461 /* Round down to multiple of blocksize */ 462 nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1); 463 if (nmp->nm_rsize <= 0) 464 nmp->nm_rsize = NFS_FABLKSIZE; 465 adjsock |= (nmp->nm_rsize != osize); 466 } 467 if (nmp->nm_rsize > maxio) 468 nmp->nm_rsize = maxio; 469 if (nmp->nm_rsize > MAXBSIZE) 470 nmp->nm_rsize = MAXBSIZE; 471 472 if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) { 473 nmp->nm_readdirsize = argp->readdirsize; 474 /* Round down to multiple of blocksize */ 475 nmp->nm_readdirsize &= ~(NFS_DIRBLKSIZ - 1); 476 if (nmp->nm_readdirsize < NFS_DIRBLKSIZ) 477 nmp->nm_readdirsize = NFS_DIRBLKSIZ; 478 } else if (argp->flags & NFSMNT_RSIZE) 479 nmp->nm_readdirsize = nmp->nm_rsize; 480 481 if (nmp->nm_readdirsize > maxio) 482 nmp->nm_readdirsize = maxio; 483 484 if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 && 485 argp->maxgrouplist <= NFS_MAXGRPS) 486 nmp->nm_numgrps = argp->maxgrouplist; 487 if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 && 488 argp->readahead <= NFS_MAXRAHEAD) 489 nmp->nm_readahead = argp->readahead; 490 if (argp->flags & NFSMNT_ACREGMIN && argp->acregmin >= 0) { 491 if (argp->acregmin > 0xffff) 492 nmp->nm_acregmin = 0xffff; 493 else 494 nmp->nm_acregmin = argp->acregmin; 495 } 496 if (argp->flags & NFSMNT_ACREGMAX && argp->acregmax >= 0) { 497 if (argp->acregmax > 0xffff) 498 nmp->nm_acregmax = 0xffff; 499 else 500 nmp->nm_acregmax = argp->acregmax; 501 } 502 if (nmp->nm_acregmin > nmp->nm_acregmax) 503 nmp->nm_acregmin = nmp->nm_acregmax; 504 505 if (argp->flags & NFSMNT_ACDIRMIN && argp->acdirmin >= 0) { 506 if (argp->acdirmin > 0xffff) 507 nmp->nm_acdirmin = 0xffff; 508 else 509 nmp->nm_acdirmin = argp->acdirmin; 510 } 511 if (argp->flags & NFSMNT_ACDIRMAX && argp->acdirmax >= 0) { 512 if (argp->acdirmax > 0xffff) 513 nmp->nm_acdirmax = 0xffff; 514 else 515 nmp->nm_acdirmax = argp->acdirmax; 516 } 517 if (nmp->nm_acdirmin > nmp->nm_acdirmax) 518 nmp->nm_acdirmin = nmp->nm_acdirmax; 519 520 if (nmp->nm_so && adjsock) { 521 nfs_disconnect(nmp); 522 if (nmp->nm_sotype == SOCK_DGRAM) 523 while (nfs_connect(nmp, NULL)) { 524 printf("nfs_args: retrying connect\n"); 525 tsleep_nsec(&nowake, PSOCK, "nfscon", 526 SEC_TO_NSEC(1)); 527 } 528 } 529 530 /* Update nargp based on nmp */ 531 nargp->wsize = nmp->nm_wsize; 532 nargp->rsize = nmp->nm_rsize; 533 nargp->readdirsize = nmp->nm_readdirsize; 534 nargp->timeo = nmp->nm_timeo; 535 nargp->retrans = nmp->nm_retry; 536 nargp->maxgrouplist = nmp->nm_numgrps; 537 nargp->readahead = nmp->nm_readahead; 538 nargp->acregmin = nmp->nm_acregmin; 539 nargp->acregmax = nmp->nm_acregmax; 540 nargp->acdirmin = nmp->nm_acdirmin; 541 nargp->acdirmax = nmp->nm_acdirmax; 542 } 543 544 /* 545 * VFS Operations. 546 * 547 * mount system call 548 * It seems a bit dumb to copyinstr() the host here and then 549 * bcopy() it in mountnfs(), but I wanted to detect errors before 550 * doing the sockargs() call because sockargs() allocates an mbuf and 551 * an error after that means that I have to release the mbuf. 552 */ 553 /* ARGSUSED */ 554 int 555 nfs_mount(struct mount *mp, const char *path, void *data, 556 struct nameidata *ndp, struct proc *p) 557 { 558 int error; 559 struct nfs_args *args = data; 560 struct mbuf *nam; 561 struct vnode *vp; 562 char hst[MNAMELEN]; 563 size_t len; 564 u_char nfh[NFSX_V3FHMAX]; 565 566 if (args && 567 (args->flags & (NFSMNT_NFSV3|NFSMNT_RDIRPLUS)) == NFSMNT_RDIRPLUS) 568 return (EINVAL); 569 570 if (nfs_niothreads < 0) { 571 nfs_niothreads = 4; 572 nfs_getset_niothreads(1); 573 } 574 575 if (mp->mnt_flag & MNT_UPDATE) { 576 struct nfsmount *nmp = VFSTONFS(mp); 577 578 if (nmp == NULL) 579 return (EIO); 580 /* 581 * When doing an update, we can't change from or to 582 * v3. 583 */ 584 if (args) { 585 args->flags = (args->flags & ~(NFSMNT_NFSV3)) | 586 (nmp->nm_flag & (NFSMNT_NFSV3)); 587 nfs_decode_args(nmp, args, &mp->mnt_stat.mount_info.nfs_args); 588 } 589 return (0); 590 } 591 if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX) 592 return (EINVAL); 593 error = copyin(args->fh, nfh, args->fhsize); 594 if (error) 595 return (error); 596 error = copyinstr(args->hostname, hst, MNAMELEN-1, &len); 597 if (error) 598 return (error); 599 memset(&hst[len], 0, MNAMELEN - len); 600 /* sockargs() call must be after above copyin() calls */ 601 error = sockargs(&nam, args->addr, args->addrlen, MT_SONAME); 602 if (error) 603 return (error); 604 args->fh = nfh; 605 error = mountnfs(args, mp, nam, path, hst, &vp, p); 606 return (error); 607 } 608 609 /* 610 * Common code for mount and mountroot 611 */ 612 int 613 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, 614 const char *pth, char *hst, struct vnode **vpp, struct proc *p) 615 { 616 struct nfsmount *nmp; 617 struct nfsnode *np; 618 struct vnode *vp; 619 struct vattr attr; 620 int error; 621 622 if (mp->mnt_flag & MNT_UPDATE) { 623 nmp = VFSTONFS(mp); 624 /* update paths, file handles, etc, here XXX */ 625 m_freem(nam); 626 return (0); 627 } else { 628 nmp = malloc(sizeof(*nmp), M_NFSMNT, 629 M_WAITOK|M_ZERO); 630 mp->mnt_data = nmp; 631 } 632 633 vfs_getnewfsid(mp); 634 nmp->nm_mountp = mp; 635 nmp->nm_timeo = NFS_TIMEO; 636 nmp->nm_retry = NFS_RETRANS; 637 nmp->nm_wsize = NFS_WSIZE; 638 nmp->nm_rsize = NFS_RSIZE; 639 nmp->nm_readdirsize = NFS_READDIRSIZE; 640 nmp->nm_numgrps = NFS_MAXGRPS; 641 nmp->nm_readahead = NFS_DEFRAHEAD; 642 nmp->nm_acregmin = NFS_MINATTRTIMO; 643 nmp->nm_acregmax = NFS_MAXATTRTIMO; 644 nmp->nm_acdirmin = NFS_MINATTRTIMO; 645 nmp->nm_acdirmax = NFS_MAXATTRTIMO; 646 mp->mnt_stat.f_namemax = MAXNAMLEN; 647 memset(mp->mnt_stat.f_mntonname, 0, MNAMELEN); 648 strlcpy(mp->mnt_stat.f_mntonname, pth, MNAMELEN); 649 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); 650 strlcpy(mp->mnt_stat.f_mntfromname, hst, MNAMELEN); 651 memset(mp->mnt_stat.f_mntfromspec, 0, MNAMELEN); 652 strlcpy(mp->mnt_stat.f_mntfromspec, hst, MNAMELEN); 653 bcopy(argp, &mp->mnt_stat.mount_info.nfs_args, sizeof(*argp)); 654 nmp->nm_nam = nam; 655 nfs_decode_args(nmp, argp, &mp->mnt_stat.mount_info.nfs_args); 656 657 nfs_ninit(nmp); 658 TAILQ_INIT(&nmp->nm_reqsq); 659 timeout_set_proc(&nmp->nm_rtimeout, nfs_timer, nmp); 660 661 /* Set up the sockets and per-host congestion */ 662 nmp->nm_sotype = argp->sotype; 663 nmp->nm_soproto = argp->proto; 664 665 /* 666 * For Connection based sockets (TCP,...) defer the connect until 667 * the first request, in case the server is not responding. 668 */ 669 if (nmp->nm_sotype == SOCK_DGRAM && 670 (error = nfs_connect(nmp, NULL))) 671 goto bad; 672 673 /* 674 * This is silly, but it has to be set so that vinifod() works. 675 * We do not want to do an nfs_statfs() here since we can get 676 * stuck on a dead server and we are holding a lock on the mount 677 * point. 678 */ 679 mp->mnt_stat.f_iosize = NFS_MAXDGRAMDATA; 680 error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np); 681 if (error) 682 goto bad; 683 vp = NFSTOV(np); 684 error = VOP_GETATTR(vp, &attr, p->p_ucred, p); 685 if (error) { 686 vput(vp); 687 goto bad; 688 } 689 690 /* 691 * A reference count is needed on the nfsnode representing the 692 * remote root. If this object is not persistent, then backward 693 * traversals of the mount point (i.e. "..") will not work if 694 * the nfsnode gets flushed out of the cache. Ufs does not have 695 * this problem, because one can identify root inodes by their 696 * number == ROOTINO (2). So, just unlock, but no rele. 697 */ 698 nmp->nm_vnode = vp; 699 if (vp->v_type == VNON) 700 vp->v_type = VDIR; 701 vp->v_flag = VROOT; 702 VOP_UNLOCK(vp); 703 *vpp = vp; 704 705 return (0); 706 bad: 707 nfs_disconnect(nmp); 708 free(nmp, M_NFSMNT, sizeof(*nmp)); 709 m_freem(nam); 710 return (error); 711 } 712 713 /* unmount system call */ 714 int 715 nfs_unmount(struct mount *mp, int mntflags, struct proc *p) 716 { 717 struct nfsmount *nmp; 718 struct vnode *vp; 719 int error, flags = 0; 720 721 nmp = VFSTONFS(mp); 722 error = nfs_root(mp, &vp); 723 if (error) 724 return (error); 725 726 if ((mntflags & MNT_FORCE) == 0 && vp->v_usecount > 2) { 727 vput(vp); 728 return (EBUSY); 729 } 730 731 if (mntflags & MNT_FORCE) 732 flags |= FORCECLOSE; 733 734 error = vflush(mp, vp, flags); 735 if (error) { 736 vput(vp); 737 return (error); 738 } 739 740 /* 741 * There are two references count to get rid of here: one 742 * from mountnfs() and one from nfs_root() above. 743 */ 744 vrele(vp); 745 vput(vp); 746 vgone(vp); 747 nfs_disconnect(nmp); 748 m_freem(nmp->nm_nam); 749 timeout_del(&nmp->nm_rtimeout); 750 timeout_set_proc(&nmp->nm_rtimeout, nfs_reaper, nmp); 751 timeout_add(&nmp->nm_rtimeout, 0); 752 mp->mnt_data = NULL; 753 return (0); 754 } 755 756 /* 757 * Delay nfs mount point free until pending or sleeping timeouts have finished. 758 */ 759 void 760 nfs_reaper(void *arg) 761 { 762 struct nfsmount *nmp = arg; 763 764 free(nmp, M_NFSMNT, sizeof(*nmp)); 765 } 766 767 /* 768 * Return root of a filesystem 769 */ 770 int 771 nfs_root(struct mount *mp, struct vnode **vpp) 772 { 773 struct vnode *vp; 774 struct nfsmount *nmp; 775 int error; 776 777 nmp = VFSTONFS(mp); 778 vp = nmp->nm_vnode; 779 vref(vp); 780 error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 781 if (error) { 782 vrele(vp); 783 return (error); 784 } 785 *vpp = vp; 786 return (0); 787 } 788 789 /* 790 * Flush out the buffer cache 791 */ 792 int 793 nfs_sync(struct mount *mp, int waitfor, int stall, struct ucred *cred, struct proc *p) 794 { 795 struct vnode *vp; 796 int allerror = 0; 797 int empty, error, s; 798 799 /* 800 * Don't traverse the vnode list if we want to skip all of them. 801 */ 802 if (waitfor == MNT_LAZY) 803 return (allerror); 804 805 /* 806 * Force stale buffer cache information to be flushed. 807 */ 808 loop: 809 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 810 /* 811 * If the vnode that we are about to sync is no longer 812 * associated with this mount point, start over. 813 */ 814 if (vp->v_mount != mp) 815 goto loop; 816 if (VOP_ISLOCKED(vp)) 817 continue; 818 s = splbio(); 819 empty = LIST_EMPTY(&vp->v_dirtyblkhd); 820 splx(s); 821 if (empty) 822 continue; 823 if (vget(vp, LK_EXCLUSIVE)) 824 goto loop; 825 error = VOP_FSYNC(vp, cred, waitfor, p); 826 if (error) 827 allerror = error; 828 vput(vp); 829 } 830 831 return (allerror); 832 } 833 834 /* 835 * NFS flat namespace lookup. 836 * Currently unsupported. 837 */ 838 /* ARGSUSED */ 839 int 840 nfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) 841 { 842 843 return (EOPNOTSUPP); 844 } 845 846 /* 847 * Do that sysctl thang... 848 */ 849 int 850 nfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 851 size_t newlen, struct proc *p) 852 { 853 int rv; 854 855 /* 856 * All names at this level are terminal. 857 */ 858 if(namelen > 1) 859 return ENOTDIR; /* overloaded */ 860 861 switch(name[0]) { 862 case NFS_NFSSTATS: 863 if(!oldp) { 864 *oldlenp = sizeof nfsstats; 865 return 0; 866 } 867 868 if(*oldlenp < sizeof nfsstats) { 869 *oldlenp = sizeof nfsstats; 870 return ENOMEM; 871 } 872 873 rv = copyout(&nfsstats, oldp, sizeof nfsstats); 874 if(rv) return rv; 875 876 if(newp && newlen != sizeof nfsstats) 877 return EINVAL; 878 879 if(newp) { 880 return copyin(newp, &nfsstats, sizeof nfsstats); 881 } 882 return 0; 883 884 case NFS_NIOTHREADS: 885 nfs_getset_niothreads(0); 886 887 rv = sysctl_int(oldp, oldlenp, newp, newlen, &nfs_niothreads); 888 if (newp) 889 nfs_getset_niothreads(1); 890 891 return rv; 892 893 default: 894 return EOPNOTSUPP; 895 } 896 } 897 898 899 /* 900 * At this point, this should never happen 901 */ 902 /* ARGSUSED */ 903 int 904 nfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 905 { 906 return (EINVAL); 907 } 908 909 /* 910 * Vnode pointer to File handle, should never happen either 911 */ 912 /* ARGSUSED */ 913 int 914 nfs_vptofh(struct vnode *vp, struct fid *fhp) 915 { 916 return (EINVAL); 917 } 918 919 /* 920 * Vfs start routine, a no-op. 921 */ 922 /* ARGSUSED */ 923 int 924 nfs_start(struct mount *mp, int flags, struct proc *p) 925 { 926 return (0); 927 } 928 929 /* 930 * Do operations associated with quotas, not supported 931 */ 932 /* ARGSUSED */ 933 int 934 nfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg, struct proc *p) 935 { 936 return (EOPNOTSUPP); 937 } 938 939 /* 940 * check export permission, not supported 941 */ 942 /* ARGUSED */ 943 int 944 nfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp, 945 struct ucred **credanonp) 946 { 947 return (EOPNOTSUPP); 948 } 949
Cache object: f9d545adb9ef25a62ac37847562ae227
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