coda_vfsops.c revision 1.24
1 /* $NetBSD: coda_vfsops.c,v 1.24 2003/06/29 02:17:00 thorpej Exp $ */ 2 3 /* 4 * 5 * Coda: an Experimental Distributed File System 6 * Release 3.1 7 * 8 * Copyright (c) 1987-1998 Carnegie Mellon University 9 * All Rights Reserved 10 * 11 * Permission to use, copy, modify and distribute this software and its 12 * documentation is hereby granted, provided that both the copyright 13 * notice and this permission notice appear in all copies of the 14 * software, derivative works or modified versions, and any portions 15 * thereof, and that both notices appear in supporting documentation, and 16 * that credit is given to Carnegie Mellon University in all documents 17 * and publicity pertaining to direct or indirect use of this code or its 18 * derivatives. 19 * 20 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, 21 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS 22 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON 23 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER 24 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF 25 * ANY DERIVATIVE WORK. 26 * 27 * Carnegie Mellon encourages users of this software to return any 28 * improvements or extensions that they make, and to grant Carnegie 29 * Mellon the rights to redistribute these changes without encumbrance. 30 * 31 * @(#) cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:26:45 rvb Exp $ 32 */ 33 34 /* 35 * Mach Operating System 36 * Copyright (c) 1989 Carnegie-Mellon University 37 * All rights reserved. The CMU software License Agreement specifies 38 * the terms and conditions for use and redistribution. 39 */ 40 41 /* 42 * This code was written for the Coda file system at Carnegie Mellon 43 * University. Contributers include David Steere, James Kistler, and 44 * M. Satyanarayanan. 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: coda_vfsops.c,v 1.24 2003/06/29 02:17:00 thorpej Exp $"); 49 50 #ifdef _LKM 51 #define NVCODA 4 52 #else 53 #include <vcoda.h> 54 #endif 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/malloc.h> 59 #include <sys/conf.h> 60 #include <sys/namei.h> 61 #include <sys/mount.h> 62 #include <sys/proc.h> 63 #include <sys/select.h> 64 65 #include <coda/coda.h> 66 #include <coda/cnode.h> 67 #include <coda/coda_vfsops.h> 68 #include <coda/coda_venus.h> 69 #include <coda/coda_subr.h> 70 #include <coda/coda_opstats.h> 71 /* for VN_RDEV */ 72 #include <miscfs/specfs/specdev.h> 73 74 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 75 76 int codadebug = 0; 77 78 int coda_vfsop_print_entry = 0; 79 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 80 81 struct vnode *coda_ctlvp; 82 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 83 84 /* structure to keep statistics of internally generated/satisfied calls */ 85 86 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 87 88 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 89 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 90 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 91 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 92 93 extern const struct cdevsw vcoda_cdevsw; 94 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 95 96 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 97 &coda_vnodeop_opv_desc, 98 NULL, 99 }; 100 101 struct vfsops coda_vfsops = { 102 MOUNT_CODA, 103 coda_mount, 104 coda_start, 105 coda_unmount, 106 coda_root, 107 coda_quotactl, 108 coda_nb_statfs, 109 coda_sync, 110 coda_vget, 111 (int (*) (struct mount *, struct fid *, struct vnode **, struct lwp *)) 112 eopnotsupp, 113 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 114 coda_init, 115 NULL, 116 coda_done, 117 coda_sysctl, 118 (int (*)(void)) eopnotsupp, 119 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 120 eopnotsupp, 121 coda_vnodeopv_descs, 122 0 123 }; 124 125 int 126 coda_vfsopstats_init(void) 127 { 128 int i; 129 130 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 131 coda_vfsopstats[i].opcode = i; 132 coda_vfsopstats[i].entries = 0; 133 coda_vfsopstats[i].sat_intrn = 0; 134 coda_vfsopstats[i].unsat_intrn = 0; 135 coda_vfsopstats[i].gen_intrn = 0; 136 } 137 138 return 0; 139 } 140 141 /* 142 * cfs mount vfsop 143 * Set up mount info record and attach it to vfs struct. 144 */ 145 /*ARGSUSED*/ 146 int 147 coda_mount(vfsp, path, data, ndp, l) 148 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 149 const char *path; /* path covered: ignored by the fs-layer */ 150 void *data; /* Need to define a data type for this in netbsd? */ 151 struct nameidata *ndp; /* Clobber this to lookup the device name */ 152 struct lwp *l; /* The ever-famous lwp pointer */ 153 { 154 struct vnode *dvp; 155 struct cnode *cp; 156 dev_t dev; 157 struct coda_mntinfo *mi; 158 struct vnode *rootvp; 159 const struct cdevsw *cdev; 160 ViceFid rootfid; 161 ViceFid ctlfid; 162 int error; 163 164 if (vfsp->mnt_flag & MNT_GETARGS) 165 return 0; 166 ENTRY; 167 168 coda_vfsopstats_init(); 169 coda_vnodeopstats_init(); 170 171 MARK_ENTRY(CODA_MOUNT_STATS); 172 if (CODA_MOUNTED(vfsp)) { 173 MARK_INT_FAIL(CODA_MOUNT_STATS); 174 return(EBUSY); 175 } 176 177 /* Validate mount device. Similar to getmdev(). */ 178 179 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, l); 180 error = namei(ndp); 181 dvp = ndp->ni_vp; 182 183 if (error) { 184 MARK_INT_FAIL(CODA_MOUNT_STATS); 185 return (error); 186 } 187 if (dvp->v_type != VCHR) { 188 MARK_INT_FAIL(CODA_MOUNT_STATS); 189 vrele(dvp); 190 return(ENXIO); 191 } 192 dev = dvp->v_specinfo->si_rdev; 193 vrele(dvp); 194 cdev = cdevsw_lookup(dev); 195 if (cdev == NULL) { 196 MARK_INT_FAIL(CODA_MOUNT_STATS); 197 return(ENXIO); 198 } 199 200 /* 201 * See if the device table matches our expectations. 202 */ 203 if (cdev != &vcoda_cdevsw) 204 { 205 MARK_INT_FAIL(CODA_MOUNT_STATS); 206 return(ENXIO); 207 } 208 209 if (minor(dev) >= NVCODA || minor(dev) < 0) { 210 MARK_INT_FAIL(CODA_MOUNT_STATS); 211 return(ENXIO); 212 } 213 214 /* 215 * Initialize the mount record and link it to the vfs struct 216 */ 217 mi = &coda_mnttbl[minor(dev)]; 218 219 if (!VC_OPEN(&mi->mi_vcomm)) { 220 MARK_INT_FAIL(CODA_MOUNT_STATS); 221 return(ENODEV); 222 } 223 224 /* No initialization (here) of mi_vcomm! */ 225 vfsp->mnt_data = mi; 226 vfsp->mnt_stat.f_fsid.val[0] = 0; 227 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 228 mi->mi_vfsp = vfsp; 229 230 /* 231 * Make a root vnode to placate the Vnode interface, but don't 232 * actually make the CODA_ROOT call to venus until the first call 233 * to coda_root in case a server is down while venus is starting. 234 */ 235 rootfid.Volume = 0; 236 rootfid.Vnode = 0; 237 rootfid.Unique = 0; 238 cp = make_coda_node(&rootfid, vfsp, VDIR); 239 rootvp = CTOV(cp); 240 rootvp->v_flag |= VROOT; 241 242 ctlfid.Volume = CTL_VOL; 243 ctlfid.Vnode = CTL_VNO; 244 ctlfid.Unique = CTL_UNI; 245 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 246 The above code seems to cause a loop in the cnode links. 247 I don't totally understand when it happens, it is caught 248 when closing down the system. 249 */ 250 cp = make_coda_node(&ctlfid, 0, VCHR); 251 252 coda_ctlvp = CTOV(cp); 253 254 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 255 mi->mi_vfsp = vfsp; 256 mi->mi_rootvp = rootvp; 257 258 /* set filesystem block size */ 259 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 260 261 /* error is currently guaranteed to be zero, but in case some 262 code changes... */ 263 CODADEBUG(1, 264 myprintf(("coda_mount returned %d\n",error));); 265 if (error) 266 MARK_INT_FAIL(CODA_MOUNT_STATS); 267 else 268 MARK_INT_SAT(CODA_MOUNT_STATS); 269 270 return set_statfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 271 l); 272 } 273 274 int 275 coda_start(vfsp, flags, l) 276 struct mount *vfsp; 277 int flags; 278 struct lwp *l; 279 { 280 ENTRY; 281 return (0); 282 } 283 284 int 285 coda_unmount(vfsp, mntflags, l) 286 struct mount *vfsp; 287 int mntflags; 288 struct lwp *l; 289 { 290 struct coda_mntinfo *mi = vftomi(vfsp); 291 int active, error = 0; 292 293 ENTRY; 294 MARK_ENTRY(CODA_UMOUNT_STATS); 295 if (!CODA_MOUNTED(vfsp)) { 296 MARK_INT_FAIL(CODA_UMOUNT_STATS); 297 return(EINVAL); 298 } 299 300 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 301 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 302 return (EBUSY); /* Venus is still running */ 303 304 #ifdef DEBUG 305 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 306 #endif 307 vrele(mi->mi_rootvp); 308 309 active = coda_kill(vfsp, NOT_DOWNCALL); 310 mi->mi_rootvp->v_flag &= ~VROOT; 311 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 312 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 313 error = 0; 314 315 /* I'm going to take this out to allow lookups to go through. I'm 316 * not sure it's important anyway. -- DCS 2/2/94 317 */ 318 /* vfsp->VFS_DATA = NULL; */ 319 320 /* No more vfsp's to hold onto */ 321 mi->mi_vfsp = NULL; 322 mi->mi_rootvp = NULL; 323 324 if (error) 325 MARK_INT_FAIL(CODA_UMOUNT_STATS); 326 else 327 MARK_INT_SAT(CODA_UMOUNT_STATS); 328 329 return(error); 330 } 331 return (EINVAL); 332 } 333 334 /* 335 * find root of cfs 336 */ 337 int 338 coda_root(vfsp, vpp, l) 339 struct mount *vfsp; 340 struct vnode **vpp; 341 struct lwp *l; 342 { 343 struct coda_mntinfo *mi = vftomi(vfsp); 344 struct vnode **result; 345 int error; 346 struct proc *p; 347 ViceFid VFid; 348 349 p = l->l_proc; 350 ENTRY; 351 MARK_ENTRY(CODA_ROOT_STATS); 352 result = NULL; 353 354 if (vfsp == mi->mi_vfsp) { 355 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 356 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 357 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 358 { /* Found valid root. */ 359 *vpp = mi->mi_rootvp; 360 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 361 vref(*vpp); 362 vn_lock(*vpp, LK_EXCLUSIVE); 363 MARK_INT_SAT(CODA_ROOT_STATS); 364 return(0); 365 } 366 } 367 368 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, l, &VFid); 369 370 if (!error) { 371 /* 372 * Save the new rootfid in the cnode, and rehash the cnode into the 373 * cnode hash with the new fid key. 374 */ 375 coda_unsave(VTOC(mi->mi_rootvp)); 376 VTOC(mi->mi_rootvp)->c_fid = VFid; 377 coda_save(VTOC(mi->mi_rootvp)); 378 379 *vpp = mi->mi_rootvp; 380 vref(*vpp); 381 vn_lock(*vpp, LK_EXCLUSIVE); 382 MARK_INT_SAT(CODA_ROOT_STATS); 383 goto exit; 384 } else if (error == ENODEV || error == EINTR) { 385 /* Gross hack here! */ 386 /* 387 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 388 * ENODEV. Return the uninitialized root vnode to allow vfs 389 * operations such as unmount to continue. Without this hack, 390 * there is no way to do an unmount if Venus dies before a 391 * successful CODA_ROOT call is done. All vnode operations 392 * will fail. 393 */ 394 *vpp = mi->mi_rootvp; 395 vref(*vpp); 396 vn_lock(*vpp, LK_EXCLUSIVE); 397 MARK_INT_FAIL(CODA_ROOT_STATS); 398 error = 0; 399 goto exit; 400 } else { 401 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 402 MARK_INT_FAIL(CODA_ROOT_STATS); 403 404 goto exit; 405 } 406 exit: 407 return(error); 408 } 409 410 int 411 coda_quotactl(vfsp, cmd, uid, arg, l) 412 struct mount *vfsp; 413 int cmd; 414 uid_t uid; 415 caddr_t arg; 416 struct lwp *l; 417 { 418 ENTRY; 419 return (EOPNOTSUPP); 420 } 421 422 /* 423 * Get file system statistics. 424 */ 425 int 426 coda_nb_statfs(vfsp, sbp, l) 427 struct mount *vfsp; 428 struct statfs *sbp; 429 struct lwp *l; 430 { 431 struct coda_statfs fsstat; 432 struct proc *p = l->l_proc; 433 int error; 434 435 ENTRY; 436 MARK_ENTRY(CODA_STATFS_STATS); 437 if (!CODA_MOUNTED(vfsp)) { 438 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 439 return(EINVAL); 440 } 441 442 memset(sbp, 0, sizeof(struct statfs)); 443 /* XXX - what to do about f_flags, others? --bnoble */ 444 /* Below This is what AFS does 445 #define NB_SFS_SIZ 0x895440 446 */ 447 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 448 449 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, l, &fsstat); 450 451 if (!error) { 452 sbp->f_type = 0; 453 sbp->f_bsize = 8192; /* XXX */ 454 sbp->f_iosize = 8192; /* XXX */ 455 sbp->f_blocks = fsstat.f_blocks; 456 sbp->f_bfree = fsstat.f_bfree; 457 sbp->f_bavail = fsstat.f_bavail; 458 sbp->f_files = fsstat.f_files; 459 sbp->f_ffree = fsstat.f_ffree; 460 copy_statfs_info(sbp, vfsp); 461 } 462 463 MARK_INT_SAT(CODA_STATFS_STATS); 464 return(error); 465 } 466 467 /* 468 * Flush any pending I/O. 469 */ 470 int 471 coda_sync(vfsp, waitfor, cred, l) 472 struct mount *vfsp; 473 int waitfor; 474 struct ucred *cred; 475 struct lwp *l; 476 { 477 ENTRY; 478 MARK_ENTRY(CODA_SYNC_STATS); 479 MARK_INT_SAT(CODA_SYNC_STATS); 480 return(0); 481 } 482 483 int 484 coda_vget(vfsp, ino, vpp, l) 485 struct mount *vfsp; 486 ino_t ino; 487 struct vnode **vpp; 488 struct lwp *l; 489 { 490 ENTRY; 491 return (EOPNOTSUPP); 492 } 493 494 /* 495 * fhtovp is now what vget used to be in 4.3-derived systems. For 496 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 497 * a type-specific fid. 498 */ 499 int 500 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp, l) 501 struct mount *vfsp; 502 struct fid *fhp; 503 struct mbuf *nam; 504 struct vnode **vpp; 505 int *exflagsp; 506 struct ucred **creadanonp; 507 struct lwp *l; 508 { 509 struct cfid *cfid = (struct cfid *)fhp; 510 struct cnode *cp = 0; 511 int error; 512 struct proc *p; 513 ViceFid VFid; 514 int vtype; 515 516 p = l->l_proc; 517 ENTRY; 518 519 MARK_ENTRY(CODA_VGET_STATS); 520 /* Check for vget of control object. */ 521 if (IS_CTL_FID(&cfid->cfid_fid)) { 522 *vpp = coda_ctlvp; 523 vref(coda_ctlvp); 524 MARK_INT_SAT(CODA_VGET_STATS); 525 return(0); 526 } 527 528 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, l, &VFid, &vtype); 529 530 if (error) { 531 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 532 *vpp = (struct vnode *)0; 533 } else { 534 CODADEBUG(CODA_VGET, 535 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 536 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 537 538 cp = make_coda_node(&VFid, vfsp, vtype); 539 *vpp = CTOV(cp); 540 } 541 return(error); 542 } 543 544 int 545 coda_vptofh(vnp, fidp) 546 struct vnode *vnp; 547 struct fid *fidp; 548 { 549 ENTRY; 550 return (EOPNOTSUPP); 551 } 552 553 void 554 coda_init(void) 555 { 556 ENTRY; 557 } 558 559 void 560 coda_done(void) 561 { 562 ENTRY; 563 } 564 565 int 566 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, l) 567 int *name; 568 u_int namelen; 569 void *oldp; 570 size_t *oldlp; 571 void *newp; 572 size_t newl; 573 struct lwp *l; 574 { 575 576 /* all sysctl names at this level are terminal */ 577 if (namelen != 1) 578 return (ENOTDIR); /* overloaded */ 579 580 switch (name[0]) { 581 /* 582 case FFS_CLUSTERREAD: 583 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 584 */ 585 default: 586 return (EOPNOTSUPP); 587 } 588 /* NOTREACHED */ 589 } 590 591 /* 592 * To allow for greater ease of use, some vnodes may be orphaned when 593 * Venus dies. Certain operations should still be allowed to go 594 * through, but without propagating ophan-ness. So this function will 595 * get a new vnode for the file from the current run of Venus. */ 596 597 int 598 getNewVnode(vpp) 599 struct vnode **vpp; 600 { 601 struct cfid cfid; 602 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 603 604 ENTRY; 605 606 cfid.cfid_len = (short)sizeof(ViceFid); 607 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 608 /* XXX ? */ 609 610 /* We're guessing that if set, the 1st element on the list is a 611 * valid vnode to use. If not, return ENODEV as venus is dead. 612 */ 613 if (mi->mi_vfsp == NULL) 614 return ENODEV; 615 616 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 617 NULL, NULL, curlwp); /* XXX */ 618 } 619 620 #include <ufs/ufs/quota.h> 621 #include <ufs/ufs/ufsmount.h> 622 /* get the mount structure corresponding to a given device. Assume 623 * device corresponds to a UFS. Return NULL if no device is found. 624 */ 625 struct mount *devtomp(dev) 626 dev_t dev; 627 { 628 struct mount *mp, *nmp; 629 630 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 631 nmp = mp->mnt_list.cqe_next; 632 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 633 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 634 /* mount corresponds to UFS and the device matches one we want */ 635 return(mp); 636 } 637 } 638 /* mount structure wasn't found */ 639 return(NULL); 640 } 641
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