src/afs/OBSD/osi_vfsops.c

   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  *
   6  * $Id$
   7  */
   8
   9 /*
  10 copyright 2002
  11 the regents of the university of michigan
  12 all rights reserved
  13
  14 permission is granted to use, copy, create derivative works
  15 and redistribute this software and such derivative works
  16 for any purpose, so long as the name of the university of
  17 michigan is not used in any advertising or publicity
  18 pertaining to the use or distribution of this software
  19 without specific, written prior authorization.  if the
  20 above copyright notice or any other identification of the
  21 university of michigan is included in any copy of any
  22 portion of this software, then the disclaimer below must
  23 also be included.
  24
  25 this software is provided as is, without representation
  26 from the university of michigan as to its fitness for any
  27 purpose, and without warranty by the university of
  28 michigan of any kind, either express or implied, including
  29 without limitation the implied warranties of
  30 merchantability and fitness for a particular purpose. the
  31 regents of the university of michigan shall not be liable
  32 for any damages, including special, indirect, incidental, or
  33 consequential damages, with respect to any claim arising
  34 out of or in connection with the use of the software, even
  35 if it has been or is hereafter advised of the possibility of
  36 such damages.
  37 */
  38
  39 /*
  40 Copyright 1995 Massachusetts Institute of Technology.  All Rights
  41 Reserved.
  42
  43 You are hereby granted a worldwide, irrevocable, paid-up, right and
  44 license to use, execute, display, modify, copy and distribute MIT's
  45 Modifications, provided that (i) you abide by the terms and conditions
  46 of the OpenAFS License Agreement, and (ii) you do not use the name
  47 of MIT in any advertising or publicity without the prior written consent
  48 of MIT.  MIT disclaims all liability for your use of MIT's
  49 Modifications.  MIT's Modifications are provided "AS IS" WITHOUT
  50 WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO,
  51 ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
  52 NONINFRINGEMENT.
  53 */
  54
  55 /*
  56  * Some code cribbed from ffs_vfsops and other NetBSD sources, which
  57  * are marked:
  58  */
  59 /*
  60  * Copyright (c) 1989, 1991, 1993, 1994
  61  *      The Regents of the University of California.  All rights reserved.
  62  *
  63  * Redistribution and use in source and binary forms, with or without
  64  * modification, are permitted provided that the following conditions
  65  * are met:
  66  * 1. Redistributions of source code must retain the above copyright
  67  *    notice, this list of conditions and the following disclaimer.
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in the
  70  *    documentation and/or other materials provided with the distribution.
  71  * 3. All advertising materials mentioning features or use of this software
  72  *    must display the following acknowledgement:
  73  *      This product includes software developed by the University of
  74  *      California, Berkeley and its contributors.
  75  * 4. Neither the name of the University nor the names of its contributors
  76  *    may be used to endorse or promote products derived from this software
  77  *    without specific prior written permission.
  78  *
  79  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  80  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  81  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  82  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  83  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  84  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  85  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  86  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  87  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  88  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  89  * SUCH DAMAGE.
  90  *
  91  */
  92
  93 #include <afsconfig.h>
  94 #include "afs/param.h"
  95
  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/conf.h>
 102 #include <sys/exec.h>
 103 #include <sys/lkm.h>
 104 #include <sys/namei.h>
 105 #include <sys/syscall.h>
 106 #include <sys/syscallargs.h>
 107
 108 /* from /usr/src/sys/kern/vfs_subr.c */
 109 extern void insmntque(struct vnode *, struct mount *);
 110
 111 extern int sys_lkmnosys(), afs_xioctl(), Afs_xsetgroups();
 112
 113 static int lkmid = -1;
 114 static int afs_badcall(struct proc *p, void *xx, register_t * yy);
 115 static struct sysent old_sysent;
 116
 117 struct osi_vfs *afs_globalVFS;
 118 struct vcache *afs_globalVp;
 119
 120 int afs_quotactl();
 121 int afs_fhtovp();
 122 int afs_vptofh();
 123 int afsinit();
 124 int afs_start();
 125 int afs_mount();
 126 int afs_unmount();
 127 int afs_root();
 128 int afs_statfs();
 129 int afs_sync();
 130 int afs_vget();
 131 int afs_sysctl();
 132 int afs_checkexp();
 133
 134 struct vfsops afs_vfsops = {
 135     afs_mount,
 136     afs_start,
 137     afs_unmount,
 138     afs_root,
 139     afs_quotactl,
 140     afs_statfs,
 141     afs_sync,
 142     afs_vget,
 143     afs_fhtovp,
 144     afs_vptofh,
 145     afsinit,
 146     afs_sysctl,
 147     afs_checkexp,
 148 };
 149
 150 int
 151 afs_obsd_lookupname(char *fnamep, enum uio_seg segflg, int followlink,
 152                     struct vnode **compvpp)
 153 {
 154     struct nameidata nd;
 155     int niflag;
 156     int error;
 157
 158     /*
 159      * Lookup pathname "fnamep", returning leaf in *compvpp.  segflg says
 160      * whether the pathname is user or system space.
 161      */
 162     /* XXX LOCKLEAF ? */
 163     niflag = followlink ? FOLLOW : NOFOLLOW;
 164     NDINIT(&nd, LOOKUP, niflag, segflg, fnamep, osi_curproc());
 165     if ((error = namei(&nd)))
 166         return error;
 167     *compvpp = nd.ni_vp;
 168     return error;
 169 }
 170
 171 int
 172 afs_quotactl()
 173 {
 174     return EOPNOTSUPP;
 175 }
 176
 177 int
 178 afs_sysctl()
 179 {
 180     return EOPNOTSUPP;
 181 }
 182
 183 int
 184 afs_checkexp()
 185 {
 186     return EOPNOTSUPP;
 187 }
 188
 189 int
 190 afs_fhtovp(mp, fhp, vpp)
 191      struct mount *mp;
 192      struct fid *fhp;
 193      struct vnode **vpp;
 194 {
 195
 196     return (EINVAL);
 197 }
 198
 199 int
 200 afs_vptofh(vp, fhp)
 201      struct vnode *vp;
 202      struct fid *fhp;
 203 {
 204
 205     return (EINVAL);
 206 }
 207
 208 int
 209 afs_start(mp, flags, p)
 210      struct mount *mp;
 211      int flags;
 212      struct proc *p;
 213 {
 214     return (0);                 /* nothing to do. ? */
 215 }
 216
 217 int
 218 afs_mount(mp, path, data, ndp, p)
 219      struct mount *mp;
 220      char *path;
 221      caddr_t data;
 222      struct nameidata *ndp;
 223      struct proc *p;
 224 {
 225     /* ndp contains the mounted-from device.  Just ignore it.
 226      * we also don't care about our proc struct. */
 227     int size;
 228
 229     if (mp->mnt_flag & MNT_UPDATE)
 230         return EINVAL;
 231
 232     if (afs_globalVFS) {
 233         /* Don't allow remounts */
 234         return EBUSY;
 235     }
 236
 237     AFS_STATCNT(afs_mount);
 238     AFS_GLOCK();
 239
 240     /* initialize the vcache entries before we start using them */
 241
 242     /* XXX find a better place for this if possible  */
 243     afs_globalVFS = mp;
 244     mp->osi_vfs_bsize = 8192;
 245     mp->osi_vfs_fsid.val[0] = AFS_VFSMAGIC;     /* magic */
 246     mp->osi_vfs_fsid.val[1] = (int)AFS_VFSFSID;
 247
 248 #if defined(AFS_OBSD53_ENV)
 249     bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
 250     strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN);
 251 #else
 252     (void)copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
 253     bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
 254 #endif
 255     bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
 256     strcpy(mp->mnt_stat.f_mntfromname, "AFS");
 257     /* null terminated string "AFS" will fit, just leave it be. */
 258     strcpy(mp->mnt_stat.f_fstypename, MOUNT_AFS);
 259     AFS_GUNLOCK();
 260     (void)afs_statfs(mp, &mp->mnt_stat);
 261
 262     return 0;
 263 }
 264
 265 int
 266 afs_unmount(afsp, flags, p)
 267      struct mount *afsp;
 268      int flags;
 269      struct proc *p;
 270 {
 271     extern int sys_ioctl(), sys_setgroups();
 272
 273     struct vnode *vp;
 274
 275     for (vp = LIST_FIRST(&afsp->mnt_vnodelist); vp != NULL;
 276         vp = LIST_NEXT(vp, v_mntvnodes)) {
 277         if (vp->v_usecount) return EBUSY;
 278     }
 279
 280     AFS_STATCNT(afs_unmount);
 281     if (afs_globalVFS == NULL) {
 282         printf("afs already unmounted\n");
 283         return 0;
 284     }
 285     if (afs_globalVp)
 286         vrele(AFSTOV(afs_globalVp));
 287     afs_globalVp = NULL;
 288
 289     vflush(afsp, NULLVP, 0);    /* don't support forced */
 290     afsp->mnt_data = NULL;
 291     AFS_GLOCK();
 292     afs_globalVFS = 0;
 293     afs_cold_shutdown = 1;
 294     afs_shutdown();             /* XXX */
 295     AFS_GUNLOCK();
 296
 297     /* give up syscall entries for ioctl & setgroups, which we've stolen */
 298     sysent[SYS_ioctl].sy_call = sys_ioctl;
 299     sysent[SYS_setgroups].sy_call = sys_setgroups;
 300
 301     /* give up the stolen syscall entry */
 302     sysent[AFS_SYSCALL].sy_narg = 0;
 303     sysent[AFS_SYSCALL].sy_argsize = 0;
 304     sysent[AFS_SYSCALL].sy_call = afs_badcall;
 305     printf
 306         ("AFS unmounted--use `/sbin/modunload -i %d' to unload before restarting AFS\n",
 307          lkmid);
 308     return 0;
 309 }
 310
 311 static int
 312 afs_badcall(struct proc *p, void *xx, register_t * yy)
 313 {
 314     return ENOSYS;
 315 }
 316
 317 #if defined(AFS_OBSD49_ENV)
 318 extern struct vops afs_vops;
 319 #endif
 320
 321 void
 322 afs_obsd_getnewvnode(struct vcache *tvc)
 323 {
 324 #if defined(AFS_OBSD49_ENV)
 325     while (getnewvnode(VT_AFS, afs_globalVFS, &afs_vops, &tvc->v)) {
 326 #else
 327     while (getnewvnode(VT_AFS, afs_globalVFS, afs_vnodeop_p, &tvc->v)) {
 328 #endif
 329         /* no vnodes available, force an alloc (limits be damned)! */
 330         desiredvnodes++;
 331     }
 332     tvc->v->v_data = (void *)tvc;
 333 }
 334
 335 int
 336 afs_root(struct mount *mp, struct vnode **vpp)
 337 {
 338     struct vrequest treq;
 339     struct vcache *tvp;
 340     int code;
 341
 342     AFS_STATCNT(afs_root);
 343
 344     AFS_GLOCK();
 345     if (!(code = afs_InitReq(&treq, osi_curcred()))
 346         && !(code = afs_CheckInit())) {
 347         tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
 348         if (tvp) {
 349             /* There is really no reason to over-hold this bugger--it's held
 350              * by the root filesystem reference. */
 351             if (afs_globalVp != tvp) {
 352 #ifdef AFS_DONT_OVERHOLD_GLOBALVP
 353                 if (afs_globalVp)
 354                     AFS_RELE(AFSTOV(afs_globalVp));
 355 #endif
 356                 afs_globalVp = tvp;
 357                 vref(AFSTOV(afs_globalVp));
 358             }
 359             AFSTOV(tvp)->v_flag |= VROOT;
 360             afs_globalVFS = mp;
 361             *vpp = AFSTOV(tvp);
 362         } else
 363             code = EIO;
 364     }
 365     AFS_GUNLOCK();
 366
 367     if (!code)
 368         vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, curproc);        /* return it locked */
 369     return code;
 370 }
 371
 372 int
 373 afs_statfs(struct osi_vfs *afsp, struct statfs *abp)
 374 {
 375     AFS_STATCNT(afs_statfs);
 376     abp->f_bsize = afsp->osi_vfs_bsize;
 377
 378     abp->f_blocks = abp->f_bfree = abp->f_bavail = abp->f_files =
 379         abp->f_ffree = AFS_VFS_FAKEFREE;
 380     abp->f_fsid.val[0] = AFS_VFSMAGIC;  /* magic */
 381     abp->f_fsid.val[1] = (int)AFS_VFSFSID;
 382     return 0;
 383 }
 384
 385 int
 386 afs_sync(struct osi_vfs *afsp)
 387 {
 388     AFS_STATCNT(afs_sync);
 389     return 0;
 390 }
 391
 392 int
 393 afs_vget(vp, lfl)
 394      struct vnode *vp;
 395      int lfl;
 396 {
 397     int error;
 398
 399     if (vp->v_usecount < 0) {
 400         vprint("bad usecount", vp);
 401         panic("afs_vget");
 402     }
 403     error = vget(vp, lfl, curproc);
 404     if (!error && vp->v_usecount == 1) {
 405         /* vget() took it off the freelist; put it on our mount queue */
 406         insmntque(vp, afs_globalVFS);
 407     }
 408     return error;
 409 }
 410
 411 extern struct vfsops afs_vfsops;
 412 extern struct vnodeopv_desc afs_vnodeop_opv_desc;
 413
 414 static struct vfsconf afs_vfsconf = {
 415     &afs_vfsops,
 416     "afs",
 417     0,
 418     0,
 419     0,
 420     NULL,
 421     NULL,
 422 };
 423
 424 MOD_VFS("afs", 0, &afs_vfsconf);
 425
 426 static char afsgenmem[] = "afsgenmem";
 427 static char afsfidmem[] = "afsfidmem";
 428 static char afsbhdrmem[] = "afsbhdrmem";
 429 static char afsbfrmem[] = "afsbfrmem";
 430
 431 int
 432 afsinit()
 433 {
 434     old_sysent = sysent[AFS_SYSCALL];
 435
 436     sysent[AFS_SYSCALL].sy_call = afs3_syscall;
 437     sysent[AFS_SYSCALL].sy_narg = 6;
 438     sysent[AFS_SYSCALL].sy_argsize = 6 * sizeof(long);
 439     sysent[SYS_ioctl].sy_call = afs_xioctl;
 440     sysent[SYS_setgroups].sy_call = Afs_xsetgroups;
 441     osi_Init();
 442
 443     return 0;
 444 }
 445
 446 int
 447 afs_vfs_load(struct lkm_table *lkmtp, int cmd)
 448 {
 449     extern char *memname[];
 450
 451 #if ! defined(AFS_OBSD49_ENV)
 452     vfs_opv_init_explicit(&afs_vnodeop_opv_desc);
 453     vfs_opv_init_default(&afs_vnodeop_opv_desc);
 454 #endif
 455     if (memname[M_AFSGENERIC] == NULL)
 456         memname[M_AFSGENERIC] = afsgenmem;
 457     if (memname[M_AFSFID] == NULL)
 458         memname[M_AFSFID] = afsfidmem;
 459     if (memname[M_AFSBUFHDR] == NULL)
 460         memname[M_AFSBUFHDR] = afsbhdrmem;
 461     if (memname[M_AFSBUFFER] == NULL)
 462         memname[M_AFSBUFFER] = afsbfrmem;
 463     lkmid = lkmtp->id;
 464     printf("OpenAFS ($Revision$) lkm loaded\n");
 465     return 0;
 466 }
 467
 468 int
 469 afs_vfs_unload(struct lkm_table *lktmp, int cmd)
 470 {
 471     extern char *memname[];
 472
 473     if (afs_globalVp)
 474         return EBUSY;
 475     if (sysent[SYS_ioctl].sy_call != sys_ioctl)
 476         return EBUSY;
 477
 478     if (memname[M_AFSGENERIC] == afsgenmem)
 479         memname[M_AFSGENERIC] = NULL;
 480     if (memname[M_AFSFID] == afsfidmem)
 481         memname[M_AFSFID] = NULL;
 482     if (memname[M_AFSBUFHDR] == afsbhdrmem)
 483         memname[M_AFSBUFHDR] = NULL;
 484     if (memname[M_AFSBUFFER] == afsbfrmem)
 485         memname[M_AFSBUFFER] = NULL;
 486
 487     sysent[AFS_SYSCALL] = old_sysent;
 488     printf("OpenAFS unloaded\n");
 489     return 0;
 490 }
 491
 492 int
 493 libafs_lkmentry(struct lkm_table *lkmtp, int cmd, int ver)
 494 {
 495     if (cmd == LKM_E_LOAD) {
 496         if (sysent[AFS_SYSCALL].sy_call == afs3_syscall
 497             || sysent[AFS_SYSCALL].sy_call == afs_badcall) {
 498             printf("AFS already loaded\n");
 499             return EINVAL;
 500         }
 501     }
 502     DISPATCH(lkmtp, cmd, ver, afs_vfs_load, afs_vfs_unload, lkm_nofunc);
 503 }