| 1 | /* |
| 2 | * OpenBSD specific assistance routines & VFS ops |
| 3 | * Original NetBSD version for Transarc afs by John Kohl <jtk@MIT.EDU> |
| 4 | * OpenBSD version by Jim Rees <rees@umich.edu> |
| 5 | * Reported to NetBSD 4.0 by Matt Benjamin (matt@linuxbox.com) |
| 6 | * |
| 7 | * $Id: osi_vfsops.c,v 1.20 2005/03/08 21:58:04 shadow Exp $ |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | copyright 2002 |
| 12 | the regents of the university of michigan |
| 13 | all rights reserved |
| 14 | |
| 15 | permission is granted to use, copy, create derivative works |
| 16 | and redistribute this software and such derivative works |
| 17 | for any purpose, so long as the name of the university of |
| 18 | michigan is not used in any advertising or publicity |
| 19 | pertaining to the use or distribution of this software |
| 20 | without specific, written prior authorization. if the |
| 21 | above copyright notice or any other identification of the |
| 22 | university of michigan is included in any copy of any |
| 23 | portion of this software, then the disclaimer below must |
| 24 | also be included. |
| 25 | |
| 26 | this software is provided as is, without representation |
| 27 | from the university of michigan as to its fitness for any |
| 28 | purpose, and without warranty by the university of |
| 29 | michigan of any kind, either express or implied, including |
| 30 | without limitation the implied warranties of |
| 31 | merchantability and fitness for a particular purpose. the |
| 32 | regents of the university of michigan shall not be liable |
| 33 | for any damages, including special, indirect, incidental, or |
| 34 | consequential damages, with respect to any claim arising |
| 35 | out of or in connection with the use of the software, even |
| 36 | if it has been or is hereafter advised of the possibility of |
| 37 | such damages. |
| 38 | */ |
| 39 | |
| 40 | /* |
| 41 | Copyright 1995 Massachusetts Institute of Technology. All Rights |
| 42 | Reserved. |
| 43 | |
| 44 | You are hereby granted a worldwide, irrevocable, paid-up, right and |
| 45 | license to use, execute, display, modify, copy and distribute MIT's |
| 46 | Modifications, provided that (i) you abide by the terms and conditions |
| 47 | of the OpenAFS License Agreement, and (ii) you do not use the name |
| 48 | of MIT in any advertising or publicity without the prior written consent |
| 49 | of MIT. MIT disclaims all liability for your use of MIT's |
| 50 | Modifications. MIT's Modifications are provided "AS IS" WITHOUT |
| 51 | WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, |
| 52 | ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR |
| 53 | NONINFRINGEMENT. |
| 54 | */ |
| 55 | |
| 56 | /* |
| 57 | * Some code cribbed from ffs_vfsops and other NetBSD sources, which |
| 58 | * are marked: |
| 59 | */ |
| 60 | /* |
| 61 | * Copyright (c) 1989, 1991, 1993, 1994 |
| 62 | * The Regents of the University of California. All rights reserved. |
| 63 | * |
| 64 | * Redistribution and use in source and binary forms, with or without |
| 65 | * modification, are permitted provided that the following conditions |
| 66 | * are met: |
| 67 | * 1. Redistributions of source code must retain the above copyright |
| 68 | * notice, this list of conditions and the following disclaimer. |
| 69 | * 2. Redistributions in binary form must reproduce the above copyright |
| 70 | * notice, this list of conditions and the following disclaimer in the |
| 71 | * documentation and/or other materials provided with the distribution. |
| 72 | * 3. All advertising materials mentioning features or use of this software |
| 73 | * must display the following acknowledgement: |
| 74 | * This product includes software developed by the University of |
| 75 | * California, Berkeley and its contributors. |
| 76 | * 4. Neither the name of the University nor the names of its contributors |
| 77 | * may be used to endorse or promote products derived from this software |
| 78 | * without specific prior written permission. |
| 79 | * |
| 80 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 81 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 82 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 83 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 84 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 85 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 86 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 87 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 88 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 89 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 90 | * SUCH DAMAGE. |
| 91 | * |
| 92 | */ |
| 93 | |
| 94 | #include <afsconfig.h> |
| 95 | #include "afs/param.h" |
| 96 | |
| 97 | #include "afs/sysincludes.h" /* Standard vendor system headers */ |
| 98 | #include "afs/afsincludes.h" /* Afs-based standard headers */ |
| 99 | #include "afs/afs_stats.h" /* statistics */ |
| 100 | |
| 101 | #include <sys/ioctl.h> |
| 102 | #ifndef AFS_NBSD60_ENV |
| 103 | #include <sys/lkm.h> |
| 104 | #endif |
| 105 | #include <sys/namei.h> |
| 106 | #include <miscfs/genfs/genfs.h> |
| 107 | |
| 108 | VFS_PROTOS(afs); |
| 109 | |
| 110 | #ifndef AFS_NBSD60_ENV |
| 111 | extern int sys_lkmnosys(struct lwp *, const void *, register_t *); |
| 112 | extern int afs3_syscall(struct lwp *, const void *, register_t *); |
| 113 | extern int afs_xioctl(struct lwp *, const void *, register_t *); |
| 114 | extern int Afs_xsetgroups(struct lwp *, const void *, register_t *); |
| 115 | static int afs_badcall(struct lwp *, const void *, register_t *); |
| 116 | |
| 117 | static int lkmid = -1; |
| 118 | |
| 119 | struct sysent afs_sysent = { 6, |
| 120 | sizeof(struct afs_sysargs), |
| 121 | 0, |
| 122 | afs3_syscall}; |
| 123 | |
| 124 | static struct sysent old_sysent; |
| 125 | static struct sysent old_setgroups; |
| 126 | #endif |
| 127 | |
| 128 | struct osi_vfs *afs_globalVFS; |
| 129 | struct vcache *afs_globalVp; |
| 130 | fsid_t afs_dynamic_fsid; |
| 131 | |
| 132 | int afs_mount(struct mount *, const char *, void *, size_t *); |
| 133 | int afs_start(struct mount *, int); |
| 134 | int afs_unmount(struct mount *, int); |
| 135 | int afs_root(struct mount *, struct vnode **); |
| 136 | int afs_statvfs(struct mount *, struct statvfs *); |
| 137 | int afs_sync(struct mount *, int, kauth_cred_t); |
| 138 | void afs_init(void); |
| 139 | void afs_reinit(void); |
| 140 | void afs_done(void); |
| 141 | |
| 142 | extern struct vnodeopv_desc afs_vnodeop_opv_desc; |
| 143 | static const struct vnodeopv_desc *afs_vnodeopv_descs[] = { |
| 144 | &afs_vnodeop_opv_desc, |
| 145 | NULL, |
| 146 | }; |
| 147 | |
| 148 | struct vfsops afs_vfsops = { |
| 149 | AFS_MOUNT_AFS, |
| 150 | #ifdef AFS_NBSD50_ENV |
| 151 | 0, /* vfs_min_mount_data */ |
| 152 | #endif |
| 153 | afs_mount, |
| 154 | afs_start, |
| 155 | afs_unmount, |
| 156 | afs_root, |
| 157 | (void *) eopnotsupp, /* vfs_quotactl */ |
| 158 | afs_statvfs, |
| 159 | afs_sync, |
| 160 | (void *) eopnotsupp, /* vfs_vget */ |
| 161 | (void *) eopnotsupp, /* vfs_fhtovp */ |
| 162 | (void *) eopnotsupp, /* vfs_vptofh */ |
| 163 | afs_init, |
| 164 | afs_reinit, |
| 165 | afs_done, |
| 166 | (void *) eopnotsupp, /* vfs_mountroot */ |
| 167 | (void *) eopnotsupp, /* vfs_snapshot */ |
| 168 | vfs_stdextattrctl, |
| 169 | #ifdef AFS_NBSD50_ENV |
| 170 | (void *) eopnotsupp, /* vfs_suspendctl */ |
| 171 | genfs_renamelock_enter, /* vfs_renamelock_enter */ |
| 172 | genfs_renamelock_exit, /* vfs_renamelock_exit */ |
| 173 | (void *) eopnotsupp, /* vfs_fsync */ |
| 174 | #endif |
| 175 | afs_vnodeopv_descs, |
| 176 | 0, /* vfs_refcount */ |
| 177 | { NULL, NULL }, |
| 178 | }; |
| 179 | |
| 180 | int |
| 181 | afs_nbsd_lookupname(const char *fnamep, enum uio_seg segflg, int followlink, |
| 182 | struct vnode **compvpp) |
| 183 | { |
| 184 | struct nameidata nd; |
| 185 | int niflag; |
| 186 | int error; |
| 187 | |
| 188 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 189 | afs_warn("afs_nbsd_lookupname enter (%s)\n", fnamep); |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Lookup pathname "fnamep", returning leaf in *compvpp. segflg says |
| 194 | * whether the pathname is user or system space. |
| 195 | */ |
| 196 | /* XXX LOCKLEAF ? */ |
| 197 | niflag = followlink ? FOLLOW : NOFOLLOW; |
| 198 | /* |
| 199 | * NBSD50 seems to have stopped caring about the curproc of things. |
| 200 | * mattjsm |
| 201 | */ |
| 202 | #if defined(AFS_NBSD60_ENV) |
| 203 | struct pathbuf *ipb = NULL; |
| 204 | ipb = pathbuf_create(fnamep); |
| 205 | NDINIT(&nd, LOOKUP, niflag, ipb); |
| 206 | #elif defined(AFS_NBSD50_ENV) |
| 207 | NDINIT(&nd, LOOKUP, niflag, segflg, fnamep); |
| 208 | #else |
| 209 | NDINIT(&nd, LOOKUP, niflag, segflg, fnamep, osi_curproc()); |
| 210 | #endif |
| 211 | if ((error = namei(&nd))) { |
| 212 | goto out; |
| 213 | } |
| 214 | *compvpp = nd.ni_vp; |
| 215 | out: |
| 216 | #if defined(AFS_NBSD60_ENV) |
| 217 | pathbuf_destroy(ipb); |
| 218 | #endif |
| 219 | return error; |
| 220 | } |
| 221 | |
| 222 | int |
| 223 | afs_start(struct mount *mp, int flags) |
| 224 | { |
| 225 | return (0); /* nothing to do? */ |
| 226 | } |
| 227 | |
| 228 | void afs_done(void) |
| 229 | { |
| 230 | return; /* nothing to do? */ |
| 231 | } |
| 232 | |
| 233 | int |
| 234 | afs_mount(struct mount *mp, const char *path, void *data, |
| 235 | size_t *dlen) |
| 236 | { |
| 237 | /* ndp contains the mounted-from device. Just ignore it. |
| 238 | * we also don't care about our proc struct. */ |
| 239 | size_t size; |
| 240 | |
| 241 | AFS_STATCNT(afs_mount); |
| 242 | |
| 243 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 244 | afs_warn("afs_mount enter\n"); |
| 245 | } |
| 246 | |
| 247 | if (mp->mnt_flag & MNT_UPDATE) |
| 248 | return EINVAL; |
| 249 | |
| 250 | if (afs_globalVFS != NULL) { |
| 251 | /* Don't allow remounts */ |
| 252 | return EBUSY; |
| 253 | } |
| 254 | |
| 255 | AFS_GLOCK(); |
| 256 | #ifdef AFS_DISCON_ENV |
| 257 | /* initialize the vcache entries before we start using them */ |
| 258 | |
| 259 | /* XXX find a better place for this if possible */ |
| 260 | init_vcache_entries(); |
| 261 | #endif |
| 262 | afs_globalVFS = mp; |
| 263 | mp->mnt_stat.f_bsize = 8192; |
| 264 | mp->mnt_stat.f_frsize = 8192; |
| 265 | mp->mnt_stat.f_iosize = 8192; |
| 266 | mp->mnt_fs_bshift = DEV_BSHIFT; |
| 267 | mp->mnt_dev_bshift = DEV_BSHIFT; |
| 268 | vfs_getnewfsid(mp); |
| 269 | afs_dynamic_fsid = mp->mnt_stat.f_fsidx; |
| 270 | (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, |
| 271 | &size); |
| 272 | memset(mp->mnt_stat.f_mntonname + size, 0, MNAMELEN - size); |
| 273 | memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN); |
| 274 | strcpy(mp->mnt_stat.f_mntfromname, "AFS"); |
| 275 | /* null terminated string "AFS" will fit, just leave it be. */ |
| 276 | strcpy(mp->mnt_stat.f_fstypename, AFS_MOUNT_AFS); |
| 277 | AFS_GUNLOCK(); |
| 278 | (void)afs_statvfs(mp, &mp->mnt_stat); |
| 279 | |
| 280 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 281 | afs_warn("afs_mount exit\n"); |
| 282 | } |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | int |
| 288 | afs_unmount(struct mount *mp, int mntflags) |
| 289 | { |
| 290 | AFS_STATCNT(afs_unmount); |
| 291 | #ifdef AFS_DISCON_ENV |
| 292 | give_up_cbs(); |
| 293 | #endif |
| 294 | if (afs_globalVFS == NULL) { |
| 295 | printf("afs already unmounted\n"); |
| 296 | return 0; |
| 297 | } |
| 298 | if (afs_globalVp) |
| 299 | vrele(AFSTOV(afs_globalVp)); |
| 300 | afs_globalVp = NULL; |
| 301 | |
| 302 | vflush(mp, NULLVP, 0); /* don't support forced */ |
| 303 | AFS_GLOCK(); |
| 304 | afs_globalVFS = NULL; |
| 305 | afs_cold_shutdown = 1; |
| 306 | afs_shutdown(); /* XXX */ |
| 307 | AFS_GUNLOCK(); |
| 308 | |
| 309 | mp->mnt_data = NULL; |
| 310 | |
| 311 | printf("AFS unmounted.\n"); |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | #ifndef AFS_NBSD60_ENV |
| 316 | static int |
| 317 | afs_badcall(struct lwp *l, const void *xx, register_t *yy) |
| 318 | { |
| 319 | return ENOSYS; |
| 320 | } |
| 321 | #endif |
| 322 | |
| 323 | int |
| 324 | afs_root(struct mount *mp, struct vnode **vpp) |
| 325 | { |
| 326 | struct vrequest treq; |
| 327 | struct vcache *tvp; |
| 328 | struct vcache *gvp; |
| 329 | int code; |
| 330 | |
| 331 | AFS_STATCNT(afs_root); |
| 332 | |
| 333 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 334 | int glocked = ISAFS_GLOCK(); |
| 335 | afs_warn("afs_root enter, glocked==%d\n", glocked); |
| 336 | } |
| 337 | |
| 338 | AFS_GLOCK(); |
| 339 | |
| 340 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 341 | afs_warn("afs_root: glocked\n"); |
| 342 | } |
| 343 | |
| 344 | tvp = NULL; |
| 345 | tryagain: |
| 346 | if (afs_globalVp && (afs_globalVp->f.states & CStatd)) { |
| 347 | tvp = afs_globalVp; |
| 348 | code = 0; |
| 349 | } else { |
| 350 | if (afs_globalVp) { |
| 351 | gvp = afs_globalVp; |
| 352 | afs_globalVp = NULL; |
| 353 | afs_PutVCache(gvp); |
| 354 | } |
| 355 | |
| 356 | if (!(code = afs_InitReq(&treq, osi_curcred())) |
| 357 | && !(code = afs_CheckInit())) { |
| 358 | tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL); |
| 359 | |
| 360 | if (tvp) { |
| 361 | if (afs_globalVp) { |
| 362 | |
| 363 | afs_PutVCache(tvp); |
| 364 | tvp = NULL; |
| 365 | goto tryagain; |
| 366 | } |
| 367 | afs_globalVp = tvp; |
| 368 | } else |
| 369 | code = EIO; |
| 370 | } |
| 371 | } |
| 372 | if (tvp) { |
| 373 | struct vnode *vp = AFSTOV(tvp); |
| 374 | AFS_GUNLOCK(); |
| 375 | vref(vp); |
| 376 | if (code != 0) { |
| 377 | vrele(vp); |
| 378 | return code; |
| 379 | } |
| 380 | if (!VOP_ISLOCKED(*vpp)) |
| 381 | code = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 382 | AFS_GLOCK(); |
| 383 | if (!afs_globalVp || !(afs_globalVp->f.states & CStatd) || |
| 384 | tvp != afs_globalVp) { |
| 385 | vput(vp); |
| 386 | afs_PutVCache(tvp); |
| 387 | tvp = NULL; |
| 388 | goto tryagain; |
| 389 | } |
| 390 | if (code != 0) |
| 391 | goto tryagain; |
| 392 | vp->v_vflag |= VV_ROOT; |
| 393 | if (afs_globalVFS != mp) |
| 394 | afs_globalVFS = mp; |
| 395 | *vpp = vp; |
| 396 | } |
| 397 | AFS_GUNLOCK(); |
| 398 | |
| 399 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 400 | afs_warn("afs_root exit\n"); |
| 401 | } |
| 402 | |
| 403 | return code; |
| 404 | } |
| 405 | |
| 406 | int |
| 407 | afs_statvfs(struct mount *mp, struct statvfs *abp) |
| 408 | { |
| 409 | AFS_STATCNT(afs_statfs); |
| 410 | |
| 411 | if ((afs_debug & AFSDEB_VNLAYER) != 0) { |
| 412 | afs_warn("afs_statvfs enter\n"); |
| 413 | } |
| 414 | |
| 415 | /* thank you, NetBSD */ |
| 416 | copy_statvfs_info(abp, mp); |
| 417 | |
| 418 | /* not actually sure which we really must set, but |
| 419 | * pretty sure of the right values (and in 40, none touched by |
| 420 | * the above convenience function) */ |
| 421 | abp->f_bsize = mp->osi_vfs_bsize; |
| 422 | abp->f_frsize = mp->osi_vfs_bsize; |
| 423 | abp->f_iosize = mp->osi_vfs_bsize; |
| 424 | |
| 425 | abp->f_blocks = abp->f_bfree = abp->f_bavail = abp->f_files = |
| 426 | abp->f_ffree = AFS_VFS_FAKEFREE; |
| 427 | |
| 428 | return (0); |
| 429 | } |
| 430 | |
| 431 | int |
| 432 | afs_sync(struct mount *mp, int waitfor, kauth_cred_t cred) |
| 433 | { |
| 434 | AFS_STATCNT(afs_sync); |
| 435 | #if defined(AFS_DISCON_ENV) |
| 436 | /* Can't do this in OpenBSD 2.7, it faults when called from apm_suspend() */ |
| 437 | store_dirty_vcaches(); |
| 438 | #endif |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | afs_init(void) |
| 444 | { |
| 445 | osi_Init(); |
| 446 | return; |
| 447 | } |
| 448 | |
| 449 | void |
| 450 | afs_reinit(void) |
| 451 | { |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | #ifndef AFS_NBSD60_ENV |
| 456 | /* LKM */ |
| 457 | |
| 458 | /* |
| 459 | * declare the filesystem |
| 460 | */ |
| 461 | MOD_VFS("afs", -1, &afs_vfsops); |
| 462 | |
| 463 | static int |
| 464 | afs_vfs_load(struct lkm_table *lkmtp, int cmd) |
| 465 | { |
| 466 | lkmid = lkmtp->id; |
| 467 | if (sysent[AFS_SYSCALL].sy_call != sys_lkmnosys) { |
| 468 | printf("LKM afs_vfs_load(): AFS3 syscall %d already used\n", |
| 469 | AFS_SYSCALL); |
| 470 | /* return EEXIST; */ |
| 471 | } |
| 472 | |
| 473 | old_sysent = sysent[AFS_SYSCALL]; |
| 474 | sysent[AFS_SYSCALL] = afs_sysent; |
| 475 | old_setgroups = sysent[SYS_setgroups]; |
| 476 | sysent[SYS_setgroups].sy_call = Afs_xsetgroups; |
| 477 | #if NOTYET |
| 478 | old_ioctl = sysent[SYS_ioctl]; |
| 479 | sysent[SYS_ioctl].sy_call = afs_xioctl; |
| 480 | #endif |
| 481 | |
| 482 | aprint_verbose("OpenAFS loaded\n"); |
| 483 | |
| 484 | return (0); |
| 485 | } |
| 486 | |
| 487 | static int |
| 488 | afs_vfs_unload(struct lkm_table *lktmp, int cmd) |
| 489 | { |
| 490 | if (afs_globalVp) |
| 491 | return EBUSY; |
| 492 | |
| 493 | if (sysent[AFS_SYSCALL].sy_call != afs_sysent.sy_call) { |
| 494 | printf("LKM afs_vfs_load(): AFS3 syscall %d already used\n", |
| 495 | AFS_SYSCALL); |
| 496 | return EEXIST; |
| 497 | } |
| 498 | |
| 499 | sysent[AFS_SYSCALL] = old_sysent; |
| 500 | sysent[SYS_setgroups] = old_setgroups; |
| 501 | #if NOTYET |
| 502 | sysent[SYS_ioctl] = old_ioctl; |
| 503 | #endif |
| 504 | printf("OpenAFS unloaded\n"); |
| 505 | |
| 506 | return (0); |
| 507 | } |
| 508 | |
| 509 | int libafs_lkmentry(struct lkm_table *, int, int); |
| 510 | |
| 511 | int |
| 512 | libafs_lkmentry(struct lkm_table *lkmtp, int cmd, int ver) |
| 513 | { |
| 514 | if (cmd == LKM_E_LOAD) { |
| 515 | if (sysent[AFS_SYSCALL].sy_call == afs3_syscall |
| 516 | || sysent[AFS_SYSCALL].sy_call == afs_badcall) { |
| 517 | printf("AFS already loaded\n"); |
| 518 | return EINVAL; |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | DISPATCH(lkmtp, cmd, ver, afs_vfs_load, afs_vfs_unload, lkm_nofunc); |
| 523 | } |
| 524 | #endif |