src/afs/SOLARIS/osi_vfsops.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * osi_vfsops.c for SOLARIS
  12  */
  13 #include <afsconfig.h>
  14 #include "afs/param.h"
  15
  16
  17 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  18 #include "afsincludes.h"        /* Afs-based standard headers */
  19 #include "afs/afs_stats.h"      /* statistics stuff */
  20 #include "h/modctl.h"
  21 #include "h/syscall.h"
  22 #if defined(AFS_SUN511_ENV)
  23 #include <sys/vfs_opreg.h>
  24 #endif
  25 #include <sys/kobj.h>
  26
  27 #include <sys/mount.h>
  28
  29 struct vfs *afs_globalVFS = 0;
  30 struct vcache *afs_globalVp = 0;
  31
  32 #if defined(AFS_SUN5_64BIT_ENV)
  33 extern struct sysent sysent32[];
  34 #endif
  35
  36 int afsfstype = 0;
  37
  38 int
  39 afs_mount(struct vfs *afsp, struct vnode *amvp, struct mounta *uap,
  40           afs_ucred_t *credp)
  41 {
  42
  43     AFS_GLOCK();
  44
  45     AFS_STATCNT(afs_mount);
  46
  47 #if defined(AFS_SUN510_ENV)
  48     if (secpolicy_fs_mount(credp, amvp, afsp) != 0) {
  49 #else
  50     if (!afs_osi_suser(credp)) {
  51 #endif
  52         AFS_GUNLOCK();
  53         return (EPERM);
  54     }
  55     afsp->vfs_fstype = afsfstype;
  56
  57     if (afs_globalVFS) {        /* Don't allow remounts. */
  58         AFS_GUNLOCK();
  59         return (EBUSY);
  60     }
  61
  62     afs_globalVFS = afsp;
  63     afsp->vfs_bsize = 8192;
  64     afsp->vfs_fsid.val[0] = AFS_VFSMAGIC;       /* magic */
  65     afsp->vfs_fsid.val[1] = AFS_VFSFSID;
  66     afsp->vfs_dev = AFS_VFSMAGIC;
  67
  68     AFS_GUNLOCK();
  69     return 0;
  70 }
  71
  72 static void
  73 afs_freevfs(void)
  74 {
  75
  76     afs_globalVFS = 0;
  77
  78     afs_shutdown();
  79 }
  80
  81 int
  82 afs_unmount(struct vfs *afsp, int flag, afs_ucred_t *credp)
  83 {
  84     struct vcache *rootvp = NULL;
  85
  86     AFS_GLOCK();
  87     AFS_STATCNT(afs_unmount);
  88
  89 #if defined(AFS_SUN510_ENV)
  90     if (secpolicy_fs_unmount(credp, afsp) != 0) {
  91 #else
  92     if (!afs_osi_suser(credp)) {
  93 #endif
  94         AFS_GUNLOCK();
  95         return (EPERM);
  96     }
  97
  98     if (flag & MS_FORCE) {
  99         AFS_GUNLOCK();
 100         return ENOTSUP;
 101     }
 102
 103     /* We should have one reference from the caller, and one reference for the
 104      * root vnode; any more and someone is still referencing something */
 105     if (afsp->vfs_count > 2) {
 106         AFS_GUNLOCK();
 107         return EBUSY;
 108     }
 109
 110     /* The root vnode should have one ref for the mount; any more, and someone
 111      * else is using the root vnode */
 112     if (afs_globalVp && VREFCOUNT_GT(afs_globalVp, 1)) {
 113         AFS_GUNLOCK();
 114         return EBUSY;
 115     }
 116
 117     afsp->vfs_flag |= VFS_UNMOUNTED;
 118
 119     if (afs_globalVp) {
 120         /* release the root vnode, which should be the last reference to us
 121          * besides the caller of afs_unmount */
 122         rootvp = afs_globalVp;
 123         afs_globalVp = NULL;
 124         AFS_RELE(AFSTOV(rootvp));
 125     }
 126
 127     AFS_GUNLOCK();
 128     return 0;
 129 }
 130
 131 void
 132 gafs_freevfs(struct vfs *afsp)
 133 {
 134     AFS_GLOCK();
 135
 136     afs_freevfs();
 137
 138     AFS_GUNLOCK();
 139 }
 140
 141 int
 142 afs_root(struct vfs *afsp, struct vnode **avpp)
 143 {
 144     afs_int32 code = 0;
 145     struct vrequest treq;
 146     struct vcache *tvp = 0;
 147     struct vcache *gvp;
 148     struct proc *proc = ttoproc(curthread);
 149     struct vnode *vp = afsp->vfs_vnodecovered;
 150     int locked = 0;
 151
 152     /* Potential deadlock:
 153      * afs_root is called with the Vnode's v_lock locked. Set VVFSLOCK
 154      * and drop the v_lock if we need to make an RPC to complete this
 155      * request. There used to be a deadlock on the global lock until
 156      * we stopped calling iget while holding the global lock.
 157      */
 158
 159     AFS_GLOCK();
 160
 161     AFS_STATCNT(afs_root);
 162
 163 again:
 164     if (afs_globalVp && (afs_globalVp->f.states & CStatd)) {
 165         tvp = afs_globalVp;
 166     } else {
 167         if (MUTEX_HELD(&vp->v_lock)) {
 168             vp->v_flag |= VVFSLOCK;
 169             locked = 1;
 170             mutex_exit(&vp->v_lock);
 171         }
 172
 173         if (afs_globalVp) {
 174             gvp = afs_globalVp;
 175             afs_globalVp = NULL;
 176             afs_PutVCache(gvp);
 177         }
 178
 179         if (!(code = afs_InitReq(&treq, proc->p_cred))
 180             && !(code = afs_CheckInit())) {
 181             tvp = afs_GetVCache(&afs_rootFid, &treq, NULL, NULL);
 182             /* we really want this to stay around */
 183             if (tvp) {
 184                 if (afs_globalVp) {
 185                     /* someone else got there before us! */
 186                     afs_PutVCache(tvp);
 187                     tvp = 0;
 188                     goto again;
 189                 }
 190                 afs_globalVp = tvp;
 191             } else
 192                 code = EIO;
 193         }
 194     }
 195     if (tvp) {
 196         AFS_FAST_HOLD(tvp);
 197         mutex_enter(&AFSTOV(tvp)->v_lock);
 198         AFSTOV(tvp)->v_flag |= VROOT;
 199         mutex_exit(&AFSTOV(tvp)->v_lock);
 200
 201         afs_globalVFS = afsp;
 202         *avpp = AFSTOV(tvp);
 203     }
 204
 205     afs_Trace2(afs_iclSetp, CM_TRACE_VFSROOT, ICL_TYPE_POINTER, *avpp,
 206                ICL_TYPE_INT32, code);
 207
 208     AFS_GUNLOCK();
 209     if (locked) {
 210         mutex_enter(&vp->v_lock);
 211         vp->v_flag &= ~VVFSLOCK;
 212         if (vp->v_flag & VVFSWAIT) {
 213             vp->v_flag &= ~VVFSWAIT;
 214             cv_broadcast(&vp->v_cv);
 215         }
 216     }
 217
 218     return code;
 219 }
 220
 221 int
 222 afs_statvfs(struct vfs *afsp, struct statvfs64 *abp)
 223 {
 224     AFS_GLOCK();
 225
 226     AFS_STATCNT(afs_statfs);
 227
 228     abp->f_frsize = 1024;
 229     abp->f_bsize = afsp->vfs_bsize;
 230     abp->f_blocks = abp->f_bfree = abp->f_bavail = abp->f_files =
 231         abp->f_favail = abp->f_ffree = AFS_VFS_FAKEFREE;
 232     abp->f_fsid = (AFS_VFSMAGIC << 16) || AFS_VFSFSID;
 233
 234     AFS_GUNLOCK();
 235     return 0;
 236 }
 237
 238 int
 239 afs_sync(struct vfs *afsp, short flags, afs_ucred_t *credp)
 240 {
 241     return 0;
 242 }
 243
 244 int
 245 afs_vget(struct vfs *afsp, struct vnode **avcp, struct fid *fidp)
 246 {
 247     cred_t *credp = CRED();
 248     struct vrequest treq;
 249     int code;
 250
 251     AFS_GLOCK();
 252
 253     AFS_STATCNT(afs_vget);
 254
 255     *avcp = NULL;
 256     if (!(code = afs_InitReq(&treq, credp))) {
 257         struct vcache *tvc = NULL;
 258         code = afs_osi_vget(&tvc, fidp, &treq);
 259         if (tvc) {
 260             *avcp = AFSTOV(tvc);
 261         }
 262     }
 263
 264     afs_Trace3(afs_iclSetp, CM_TRACE_VGET, ICL_TYPE_POINTER, *avcp,
 265                ICL_TYPE_INT32, treq.uid, ICL_TYPE_FID, fidp);
 266     code = afs_CheckCode(code, &treq, 42);
 267
 268     AFS_GUNLOCK();
 269     return code;
 270 }
 271
 272 /* This is only called by vfs_mount when afs is going to be mounted as root.
 273  * Since we don't support diskless clients we shouldn't come here.
 274  */
 275 int afsmountroot = 0;
 276 afs_mountroot(struct vfs *afsp, whymountroot_t why)
 277 {
 278     AFS_GLOCK();
 279     AFS_STATCNT(afs_mountroot);
 280     afsmountroot++;
 281     AFS_GUNLOCK();
 282     return EINVAL;
 283 }
 284
 285 /* afs_swapvp is called to setup swapping over the net for diskless clients.
 286  * Again not for us.
 287  */
 288 int afsswapvp = 0;
 289 afs_swapvp(struct vfs *afsp, struct vnode **avpp, char *nm)
 290 {
 291     AFS_GLOCK();
 292     AFS_STATCNT(afs_swapvp);
 293     afsswapvp++;
 294     AFS_GUNLOCK();
 295     return EINVAL;
 296 }
 297
 298
 299 #if defined(AFS_SUN511_ENV)
 300 /* The following list must always be NULL-terminated */
 301 static const fs_operation_def_t afs_vfsops_template[] = {
 302     VFSNAME_MOUNT,              { .vfs_mount = afs_mount },
 303     VFSNAME_UNMOUNT,            { .vfs_unmount = afs_unmount },
 304     VFSNAME_ROOT,               { .vfs_root = afs_root },
 305     VFSNAME_STATVFS,            { .vfs_statvfs = afs_statvfs },
 306     VFSNAME_SYNC,               { .vfs_sync = afs_sync },
 307     VFSNAME_VGET,               { .vfs_vget = afs_vget },
 308     VFSNAME_MOUNTROOT,          { .vfs_mountroot = afs_mountroot },
 309     VFSNAME_FREEVFS,            { .vfs_freevfs = gafs_freevfs },
 310     NULL,                       NULL
 311 };
 312 struct vfsops *afs_vfsopsp;
 313 #elif defined(AFS_SUN510_ENV)
 314 /* The following list must always be NULL-terminated */
 315 const fs_operation_def_t afs_vfsops_template[] = {
 316     VFSNAME_MOUNT,              afs_mount,
 317     VFSNAME_UNMOUNT,            afs_unmount,
 318     VFSNAME_ROOT,               afs_root,
 319     VFSNAME_STATVFS,            afs_statvfs,
 320     VFSNAME_SYNC,               afs_sync,
 321     VFSNAME_VGET,               afs_vget,
 322     VFSNAME_MOUNTROOT,          afs_mountroot,
 323     VFSNAME_FREEVFS,            gafs_freevfs,
 324     NULL,                       NULL
 325 };
 326 struct vfsops *afs_vfsopsp;
 327 #else
 328 struct vfsops Afs_vfsops = {
 329     afs_mount,
 330     afs_unmount,
 331     afs_root,
 332     afs_statvfs,
 333     afs_sync,
 334     afs_vget,
 335     afs_mountroot,
 336     afs_swapvp,
 337     gafs_freevfs,
 338 };
 339 #endif
 340
 341
 342 /*
 343  * afsinit - intialize VFS
 344  */
 345 int (*ufs_iallocp) ();
 346 void (*ufs_iupdatp) ();
 347 int (*ufs_igetp) ();
 348 void (*ufs_itimes_nolockp) ();
 349
 350 int (*afs_orig_ioctl) (), (*afs_orig_ioctl32) ();
 351 int (*afs_orig_setgroups) (), (*afs_orig_setgroups32) ();
 352
 353 #ifndef AFS_SUN510_ENV
 354 struct ill_s *ill_g_headp = 0;
 355 #endif
 356
 357 int afs_sinited = 0;
 358
 359 extern struct fs_operation_def afs_vnodeops_template[];
 360
 361 #if     !defined(AFS_NONFSTRANS)
 362 int (*nfs_rfsdisptab_v2) ();
 363 int (*nfs_rfsdisptab_v3) ();
 364 int (*nfs_acldisptab_v2) ();
 365 int (*nfs_acldisptab_v3) ();
 366
 367 int (*nfs_checkauth) ();
 368 #endif
 369
 370 extern Afs_syscall();
 371
 372 static void *
 373 do_mod_lookup(const char * mod, const char * sym)
 374 {
 375     void * ptr;
 376
 377     ptr = modlookup(mod, sym);
 378     if (ptr == NULL) {
 379         afs_warn("modlookup failed for symbol '%s' in module '%s'\n",
 380                  sym, mod);
 381     }
 382
 383     return ptr;
 384 }
 385
 386 #ifdef AFS_SUN510_ENV
 387 afsinit(int fstype, char *dummy)
 388 #else
 389 afsinit(struct vfssw *vfsswp, int fstype)
 390 #endif
 391 {
 392     extern int afs_xioctl();
 393     extern int afs_xsetgroups();
 394
 395     AFS_STATCNT(afsinit);
 396
 397     afs_orig_setgroups = sysent[SYS_setgroups].sy_callc;
 398     afs_orig_ioctl = sysent[SYS_ioctl].sy_call;
 399     sysent[SYS_setgroups].sy_callc = afs_xsetgroups;
 400     sysent[SYS_ioctl].sy_call = afs_xioctl;
 401
 402 #if defined(AFS_SUN5_64BIT_ENV)
 403     afs_orig_setgroups32 = sysent32[SYS_setgroups].sy_callc;
 404     afs_orig_ioctl32 = sysent32[SYS_ioctl].sy_call;
 405     sysent32[SYS_setgroups].sy_callc = afs_xsetgroups;
 406     sysent32[SYS_ioctl].sy_call = afs_xioctl;
 407 #endif /* AFS_SUN5_64BIT_ENV */
 408
 409 #ifdef AFS_SUN510_ENV
 410     vfs_setfsops(fstype, afs_vfsops_template, &afs_vfsopsp);
 411     afsfstype = fstype;
 412     vn_make_ops("afs", afs_vnodeops_template, &afs_ops);
 413 #else /* !AFS_SUN510_ENV */
 414     vfsswp->vsw_vfsops = &Afs_vfsops;
 415     afsfstype = fstype;
 416 #endif /* !AFS_SUN510_ENV */
 417
 418
 419 #if !defined(AFS_NONFSTRANS)
 420     nfs_rfsdisptab_v2 = (int (*)()) do_mod_lookup("nfssrv", "rfsdisptab_v2");
 421     if (nfs_rfsdisptab_v2 != NULL) {
 422         nfs_acldisptab_v2 = (int (*)()) do_mod_lookup("nfssrv", "acldisptab_v2");
 423         if (nfs_acldisptab_v2 != NULL) {
 424             afs_xlatorinit_v2(nfs_rfsdisptab_v2, nfs_acldisptab_v2);
 425         }
 426     }
 427     nfs_rfsdisptab_v3 = (int (*)()) do_mod_lookup("nfssrv", "rfsdisptab_v3");
 428     if (nfs_rfsdisptab_v3 != NULL) {
 429         nfs_acldisptab_v3 = (int (*)()) do_mod_lookup("nfssrv", "acldisptab_v3");
 430         if (nfs_acldisptab_v3 != NULL) {
 431             afs_xlatorinit_v3(nfs_rfsdisptab_v3, nfs_acldisptab_v3);
 432         }
 433     }
 434
 435     nfs_checkauth = (int (*)()) do_mod_lookup("nfssrv", "checkauth");
 436 #endif /* !AFS_NONFSTRANS */
 437
 438     ufs_iallocp = (int (*)()) do_mod_lookup("ufs", "ufs_ialloc");
 439     ufs_iupdatp = (void (*)()) do_mod_lookup("ufs", "ufs_iupdat");
 440     ufs_igetp = (int (*)()) do_mod_lookup("ufs", "ufs_iget");
 441     ufs_itimes_nolockp = (void (*)()) do_mod_lookup("ufs", "ufs_itimes_nolock");
 442
 443     if (!ufs_iallocp || !ufs_iupdatp || !ufs_itimes_nolockp || !ufs_igetp) {
 444         afs_warn("AFS to UFS mapping cannot be fully initialised\n");
 445     }
 446
 447 #if !defined(AFS_SUN510_ENV)
 448     ill_g_headp = (struct ill_s *) do_mod_lookup("ip", "ill_g_head");
 449 #endif /* !AFS_SUN510_ENV */
 450
 451     afs_sinited = 1;
 452     return 0;
 453
 454 }
 455
 456 #ifdef AFS_SUN510_ENV
 457 #ifdef AFS_SUN511_ENV
 458 static vfsdef_t afs_vfsdef = {
 459     VFSDEF_VERSION,
 460     "afs",
 461     afsinit,
 462     VSW_STATS,
 463     NULL
 464 };
 465 #else
 466 static struct vfsdef_v3 afs_vfsdef = {
 467     VFSDEF_VERSION,
 468     "afs",
 469     afsinit,
 470     VSW_STATS
 471 };
 472 #endif
 473 #else
 474 static struct vfssw afs_vfw = {
 475     "afs",
 476     afsinit,
 477     &Afs_vfsops,
 478     0
 479 };
 480 #endif
 481
 482 #ifndef AFS_SUN511_ENV
 483 static struct sysent afssysent = {
 484     6,
 485     0,
 486     Afs_syscall
 487 };
 488 #endif /* AFS_SUN511_ENV */
 489
 490 /*
 491  * Info/Structs to link the afs module into the kernel
 492  */
 493 extern struct mod_ops mod_fsops;
 494
 495 static struct modlfs afsmodlfs = {
 496     &mod_fsops,
 497     "afs filesystem",
 498 #ifdef AFS_SUN510_ENV
 499     &afs_vfsdef
 500 #else
 501     &afs_vfw
 502 #endif
 503 };
 504
 505 #ifdef AFS_SUN511_ENV
 506
 507 extern struct modldrv afs_modldrv;
 508
 509 #else /* AFS_SUN511_ENV */
 510
 511 extern struct mod_ops mod_syscallops;
 512 static struct modlsys afsmodlsys = {
 513     &mod_syscallops,
 514     "afs syscall interface",
 515     &afssysent
 516 };
 517
 518 /** The two structures afssysent32 and afsmodlsys32 are being added
 519   * for supporting 32 bit syscalls. In Solaris 7 there are two system
 520   * tables viz. sysent ans sysent32. 32 bit applications use sysent32.
 521   * Since most of our user space binaries are going to be 32 bit
 522   * we need to attach to sysent32 also. Note that the entry into AFS
 523   * land still happens through Afs_syscall irrespective of whether we
 524   * land here from sysent or sysent32
 525   */
 526
 527 # if defined(AFS_SUN5_64BIT_ENV)
 528 extern struct mod_ops mod_syscallops32;
 529
 530 static struct modlsys afsmodlsys32 = {
 531     &mod_syscallops32,
 532     "afs syscall interface(32 bit)",
 533     &afssysent
 534 };
 535 # endif
 536 #endif /* !AFS_SUN511_ENV */
 537
 538
 539 static struct modlinkage afs_modlinkage = {
 540     MODREV_1,
 541     (void *)&afsmodlfs,
 542 #ifdef AFS_SUN511_ENV
 543     (void *)&afs_modldrv,
 544 #else
 545     (void *)&afsmodlsys,
 546 # ifdef AFS_SUN5_64BIT_ENV
 547     (void *)&afsmodlsys32,
 548 # endif
 549 #endif /* !AFS_SUN511_ENV */
 550     NULL
 551 };
 552
 553 static void
 554 reset_sysent(void)
 555 {
 556     if (afs_sinited) {
 557         sysent[SYS_setgroups].sy_callc = afs_orig_setgroups;
 558         sysent[SYS_ioctl].sy_call = afs_orig_ioctl;
 559 #if defined(AFS_SUN5_64BIT_ENV)
 560         sysent32[SYS_setgroups].sy_callc = afs_orig_setgroups32;
 561         sysent32[SYS_ioctl].sy_call = afs_orig_ioctl32;
 562 #endif
 563     }
 564 }
 565
 566 /** This is the function that modload calls when loading the afs kernel
 567   * extensions. The solaris modload program searches for the _init
 568   * function in a module and calls it when modloading
 569   */
 570
 571 _init()
 572 {
 573     char *sysn, *mod_getsysname();
 574     int code;
 575     extern char *sysbind;
 576     extern struct bind *sb_hashtab[];
 577     struct modctl *mp = 0;
 578
 579     if (afs_sinited)
 580         return EBUSY;
 581
 582     if ((!(mp = mod_find_by_filename("fs", "ufs"))
 583          && !(mp = mod_find_by_filename(NULL, "/kernel/fs/ufs"))
 584          && !(mp = mod_find_by_filename(NULL, "sys/ufs"))) || (mp
 585                                                                && !mp->
 586                                                                mod_installed))
 587     {
 588         printf
 589             ("ufs module must be loaded before loading afs; use modload /kernel/fs/ufs\n");
 590         return (ENOSYS);
 591     }
 592 #ifndef AFS_NONFSTRANS
 593     if ((!(mp = mod_find_by_filename("misc", "nfssrv"))
 594          && !(mp = mod_find_by_filename(NULL, NFSSRV))
 595          && !(mp = mod_find_by_filename(NULL, NFSSRV_V9))
 596          && !(mp = mod_find_by_filename(NULL, NFSSRV_AMD64))) || (mp
 597                                                                && !mp->
 598                                                                mod_installed))
 599     {
 600         printf
 601             ("misc/nfssrv module must be loaded before loading afs with nfs-xlator\n");
 602         return (ENOSYS);
 603     }
 604 #endif /* !AFS_NONFSTRANS */
 605
 606
 607     osi_Init();                 /* initialize global lock, etc */
 608
 609     code = mod_install(&afs_modlinkage);
 610     if (code) {
 611         /* we failed to load, so make sure we don't leave behind any
 612          * references to our syscall handlers */
 613         reset_sysent();
 614     }
 615     return code;
 616 }
 617
 618 _info(modp)
 619      struct modinfo *modp;
 620 {
 621     int code;
 622
 623     code = mod_info(&afs_modlinkage, modp);
 624     return code;
 625 }
 626
 627 _fini()
 628 {
 629     int code;
 630
 631     if (afs_globalVFS)
 632         return EBUSY;
 633
 634     reset_sysent();
 635     code = mod_remove(&afs_modlinkage);
 636     return code;
 637 }