coda_vfsops.c revision 1.11
1 /* $NetBSD: coda_vfsops.c,v 1.11 2001/01/22 12:17:35 jdolecek 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 #ifdef _LKM 48 #define NVCODA 4 49 #else 50 #include <vcoda.h> 51 #endif 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/malloc.h> 56 #include <sys/conf.h> 57 #include <sys/namei.h> 58 #include <sys/mount.h> 59 #include <sys/proc.h> 60 #include <sys/select.h> 61 62 #include <coda/coda.h> 63 #include <coda/cnode.h> 64 #include <coda/coda_vfsops.h> 65 #include <coda/coda_venus.h> 66 #include <coda/coda_subr.h> 67 #include <coda/coda_opstats.h> 68 /* for VN_RDEV */ 69 #include <miscfs/specfs/specdev.h> 70 71 int codadebug = 0; 72 73 int coda_vfsop_print_entry = 0; 74 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__)) 75 76 struct vnode *coda_ctlvp; 77 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 78 79 /* structure to keep statistics of internally generated/satisfied calls */ 80 81 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 82 83 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 84 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 85 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 86 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 87 88 extern int coda_nc_initialized; /* Set if cache has been initialized */ 89 extern int vc_nb_open __P((dev_t, int, int, struct proc *)); 90 extern struct cdevsw cdevsw[]; /* For sanity check in coda_mount */ 91 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 92 93 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 94 &coda_vnodeop_opv_desc, 95 NULL, 96 }; 97 98 struct vfsops coda_vfsops = { 99 MOUNT_CODA, 100 coda_mount, 101 coda_start, 102 coda_unmount, 103 coda_root, 104 coda_quotactl, 105 coda_nb_statfs, 106 coda_sync, 107 coda_vget, 108 (int (*) (struct mount *, struct fid *, struct vnode ** )) 109 eopnotsupp, 110 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 111 coda_init, 112 #ifdef __NetBSD__ 113 coda_done, 114 #endif 115 coda_sysctl, 116 (int (*)(void)) eopnotsupp, 117 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 118 eopnotsupp, 119 coda_vnodeopv_descs, 120 0 121 }; 122 123 int 124 coda_vfsopstats_init(void) 125 { 126 int i; 127 128 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 129 coda_vfsopstats[i].opcode = i; 130 coda_vfsopstats[i].entries = 0; 131 coda_vfsopstats[i].sat_intrn = 0; 132 coda_vfsopstats[i].unsat_intrn = 0; 133 coda_vfsopstats[i].gen_intrn = 0; 134 } 135 136 return 0; 137 } 138 139 /* 140 * cfs mount vfsop 141 * Set up mount info record and attach it to vfs struct. 142 */ 143 /*ARGSUSED*/ 144 int 145 coda_mount(vfsp, path, data, ndp, p) 146 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 147 const char *path; /* path covered: ignored by the fs-layer */ 148 void *data; /* Need to define a data type for this in netbsd? */ 149 struct nameidata *ndp; /* Clobber this to lookup the device name */ 150 struct proc *p; /* The ever-famous proc pointer */ 151 { 152 struct vnode *dvp; 153 struct cnode *cp; 154 dev_t dev; 155 struct coda_mntinfo *mi; 156 struct vnode *rootvp; 157 ViceFid rootfid; 158 ViceFid ctlfid; 159 int error; 160 161 ENTRY; 162 163 coda_vfsopstats_init(); 164 coda_vnodeopstats_init(); 165 166 MARK_ENTRY(CODA_MOUNT_STATS); 167 if (CODA_MOUNTED(vfsp)) { 168 MARK_INT_FAIL(CODA_MOUNT_STATS); 169 return(EBUSY); 170 } 171 172 /* Validate mount device. Similar to getmdev(). */ 173 174 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 175 error = namei(ndp); 176 dvp = ndp->ni_vp; 177 178 if (error) { 179 MARK_INT_FAIL(CODA_MOUNT_STATS); 180 return (error); 181 } 182 if (dvp->v_type != VCHR) { 183 MARK_INT_FAIL(CODA_MOUNT_STATS); 184 vrele(dvp); 185 return(ENXIO); 186 } 187 dev = dvp->v_specinfo->si_rdev; 188 vrele(dvp); 189 if (major(dev) >= nchrdev || major(dev) < 0) { 190 MARK_INT_FAIL(CODA_MOUNT_STATS); 191 return(ENXIO); 192 } 193 194 /* 195 * See if the device table matches our expectations. 196 */ 197 if (cdevsw[major(dev)].d_open != vc_nb_open) 198 { 199 MARK_INT_FAIL(CODA_MOUNT_STATS); 200 return(ENXIO); 201 } 202 203 if (minor(dev) >= NVCODA || minor(dev) < 0) { 204 MARK_INT_FAIL(CODA_MOUNT_STATS); 205 return(ENXIO); 206 } 207 208 /* 209 * Initialize the mount record and link it to the vfs struct 210 */ 211 mi = &coda_mnttbl[minor(dev)]; 212 213 if (!VC_OPEN(&mi->mi_vcomm)) { 214 MARK_INT_FAIL(CODA_MOUNT_STATS); 215 return(ENODEV); 216 } 217 218 /* No initialization (here) of mi_vcomm! */ 219 vfsp->mnt_data = (qaddr_t)mi; 220 vfsp->mnt_stat.f_fsid.val[0] = 0; 221 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 222 mi->mi_vfsp = vfsp; 223 224 /* 225 * Make a root vnode to placate the Vnode interface, but don't 226 * actually make the CODA_ROOT call to venus until the first call 227 * to coda_root in case a server is down while venus is starting. 228 */ 229 rootfid.Volume = 0; 230 rootfid.Vnode = 0; 231 rootfid.Unique = 0; 232 cp = make_coda_node(&rootfid, vfsp, VDIR); 233 rootvp = CTOV(cp); 234 rootvp->v_flag |= VROOT; 235 236 ctlfid.Volume = CTL_VOL; 237 ctlfid.Vnode = CTL_VNO; 238 ctlfid.Unique = CTL_UNI; 239 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 240 The above code seems to cause a loop in the cnode links. 241 I don't totally understand when it happens, it is caught 242 when closing down the system. 243 */ 244 cp = make_coda_node(&ctlfid, 0, VCHR); 245 246 coda_ctlvp = CTOV(cp); 247 248 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 249 mi->mi_vfsp = vfsp; 250 mi->mi_rootvp = rootvp; 251 252 /* set filesystem block size */ 253 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 254 255 /* error is currently guaranteed to be zero, but in case some 256 code changes... */ 257 CODADEBUG(1, 258 myprintf(("coda_mount returned %d\n",error));); 259 if (error) 260 MARK_INT_FAIL(CODA_MOUNT_STATS); 261 else 262 MARK_INT_SAT(CODA_MOUNT_STATS); 263 264 return(error); 265 } 266 267 int 268 coda_start(vfsp, flags, p) 269 struct mount *vfsp; 270 int flags; 271 struct proc *p; 272 { 273 ENTRY; 274 return (0); 275 } 276 277 int 278 coda_unmount(vfsp, mntflags, p) 279 struct mount *vfsp; 280 int mntflags; 281 struct proc *p; 282 { 283 struct coda_mntinfo *mi = vftomi(vfsp); 284 int active, error = 0; 285 286 ENTRY; 287 MARK_ENTRY(CODA_UMOUNT_STATS); 288 if (!CODA_MOUNTED(vfsp)) { 289 MARK_INT_FAIL(CODA_UMOUNT_STATS); 290 return(EINVAL); 291 } 292 293 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 294 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 295 return (EBUSY); /* Venus is still running */ 296 297 #ifdef DEBUG 298 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 299 #endif 300 vrele(mi->mi_rootvp); 301 302 active = coda_kill(vfsp, NOT_DOWNCALL); 303 mi->mi_rootvp->v_flag &= ~VROOT; 304 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 305 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 306 error = 0; 307 308 /* I'm going to take this out to allow lookups to go through. I'm 309 * not sure it's important anyway. -- DCS 2/2/94 310 */ 311 /* vfsp->VFS_DATA = NULL; */ 312 313 /* No more vfsp's to hold onto */ 314 mi->mi_vfsp = NULL; 315 mi->mi_rootvp = NULL; 316 317 if (error) 318 MARK_INT_FAIL(CODA_UMOUNT_STATS); 319 else 320 MARK_INT_SAT(CODA_UMOUNT_STATS); 321 322 return(error); 323 } 324 return (EINVAL); 325 } 326 327 /* 328 * find root of cfs 329 */ 330 int 331 coda_root(vfsp, vpp) 332 struct mount *vfsp; 333 struct vnode **vpp; 334 { 335 struct coda_mntinfo *mi = vftomi(vfsp); 336 struct vnode **result; 337 int error; 338 struct proc *p = curproc; /* XXX - bnoble */ 339 ViceFid VFid; 340 341 ENTRY; 342 MARK_ENTRY(CODA_ROOT_STATS); 343 result = NULL; 344 345 if (vfsp == mi->mi_vfsp) { 346 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 347 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 348 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 349 { /* Found valid root. */ 350 *vpp = mi->mi_rootvp; 351 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 352 vref(*vpp); 353 vn_lock(*vpp, LK_EXCLUSIVE); 354 MARK_INT_SAT(CODA_ROOT_STATS); 355 return(0); 356 } 357 } 358 359 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 360 361 if (!error) { 362 /* 363 * Save the new rootfid in the cnode, and rehash the cnode into the 364 * cnode hash with the new fid key. 365 */ 366 coda_unsave(VTOC(mi->mi_rootvp)); 367 VTOC(mi->mi_rootvp)->c_fid = VFid; 368 coda_save(VTOC(mi->mi_rootvp)); 369 370 *vpp = mi->mi_rootvp; 371 vref(*vpp); 372 vn_lock(*vpp, LK_EXCLUSIVE); 373 MARK_INT_SAT(CODA_ROOT_STATS); 374 goto exit; 375 } else if (error == ENODEV || error == EINTR) { 376 /* Gross hack here! */ 377 /* 378 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 379 * ENODEV. Return the uninitialized root vnode to allow vfs 380 * operations such as unmount to continue. Without this hack, 381 * there is no way to do an unmount if Venus dies before a 382 * successful CODA_ROOT call is done. All vnode operations 383 * will fail. 384 */ 385 *vpp = mi->mi_rootvp; 386 vref(*vpp); 387 vn_lock(*vpp, LK_EXCLUSIVE); 388 MARK_INT_FAIL(CODA_ROOT_STATS); 389 error = 0; 390 goto exit; 391 } else { 392 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 393 MARK_INT_FAIL(CODA_ROOT_STATS); 394 395 goto exit; 396 } 397 exit: 398 return(error); 399 } 400 401 int 402 coda_quotactl(vfsp, cmd, uid, arg, p) 403 struct mount *vfsp; 404 int cmd; 405 uid_t uid; 406 caddr_t arg; 407 struct proc *p; 408 { 409 ENTRY; 410 return (EOPNOTSUPP); 411 } 412 413 /* 414 * Get file system statistics. 415 */ 416 int 417 coda_nb_statfs(vfsp, sbp, p) 418 struct mount *vfsp; 419 struct statfs *sbp; 420 struct proc *p; 421 { 422 ENTRY; 423 /* MARK_ENTRY(CODA_STATFS_STATS); */ 424 if (!CODA_MOUNTED(vfsp)) { 425 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/ 426 return(EINVAL); 427 } 428 429 bzero(sbp, sizeof(struct statfs)); 430 /* XXX - what to do about f_flags, others? --bnoble */ 431 /* Below This is what AFS does 432 #define NB_SFS_SIZ 0x895440 433 */ 434 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 435 sbp->f_type = 0; 436 sbp->f_bsize = 8192; /* XXX */ 437 sbp->f_iosize = 8192; /* XXX */ 438 #define NB_SFS_SIZ 0x8AB75D 439 sbp->f_blocks = NB_SFS_SIZ; 440 sbp->f_bfree = NB_SFS_SIZ; 441 sbp->f_bavail = NB_SFS_SIZ; 442 sbp->f_files = NB_SFS_SIZ; 443 sbp->f_ffree = NB_SFS_SIZ; 444 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 445 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 446 strcpy(sbp->f_mntonname, "/coda"); 447 strcpy(sbp->f_mntfromname, "CODA"); 448 /* MARK_INT_SAT(CODA_STATFS_STATS); */ 449 return(0); 450 } 451 452 /* 453 * Flush any pending I/O. 454 */ 455 int 456 coda_sync(vfsp, waitfor, cred, p) 457 struct mount *vfsp; 458 int waitfor; 459 struct ucred *cred; 460 struct proc *p; 461 { 462 ENTRY; 463 MARK_ENTRY(CODA_SYNC_STATS); 464 MARK_INT_SAT(CODA_SYNC_STATS); 465 return(0); 466 } 467 468 int 469 coda_vget(vfsp, ino, vpp) 470 struct mount *vfsp; 471 ino_t ino; 472 struct vnode **vpp; 473 { 474 ENTRY; 475 return (EOPNOTSUPP); 476 } 477 478 /* 479 * fhtovp is now what vget used to be in 4.3-derived systems. For 480 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 481 * a type-specific fid. 482 */ 483 int 484 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 485 struct mount *vfsp; 486 struct fid *fhp; 487 struct mbuf *nam; 488 struct vnode **vpp; 489 int *exflagsp; 490 struct ucred **creadanonp; 491 { 492 struct cfid *cfid = (struct cfid *)fhp; 493 struct cnode *cp = 0; 494 int error; 495 struct proc *p = curproc; /* XXX -mach */ 496 ViceFid VFid; 497 int vtype; 498 499 ENTRY; 500 501 MARK_ENTRY(CODA_VGET_STATS); 502 /* Check for vget of control object. */ 503 if (IS_CTL_FID(&cfid->cfid_fid)) { 504 *vpp = coda_ctlvp; 505 vref(coda_ctlvp); 506 MARK_INT_SAT(CODA_VGET_STATS); 507 return(0); 508 } 509 510 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 511 512 if (error) { 513 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 514 *vpp = (struct vnode *)0; 515 } else { 516 CODADEBUG(CODA_VGET, 517 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 518 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 519 520 cp = make_coda_node(&VFid, vfsp, vtype); 521 *vpp = CTOV(cp); 522 } 523 return(error); 524 } 525 526 int 527 coda_vptofh(vnp, fidp) 528 struct vnode *vnp; 529 struct fid *fidp; 530 { 531 ENTRY; 532 return (EOPNOTSUPP); 533 } 534 535 void 536 coda_init(void) 537 { 538 ENTRY; 539 } 540 541 #ifdef __NetBSD__ 542 void 543 coda_done(void) 544 { 545 ENTRY; 546 } 547 #endif 548 549 int 550 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 551 int *name; 552 u_int namelen; 553 void *oldp; 554 size_t *oldlp; 555 void *newp; 556 size_t newl; 557 struct proc *p; 558 { 559 560 /* all sysctl names at this level are terminal */ 561 if (namelen != 1) 562 return (ENOTDIR); /* overloaded */ 563 564 switch (name[0]) { 565 /* 566 case FFS_CLUSTERREAD: 567 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 568 */ 569 default: 570 return (EOPNOTSUPP); 571 } 572 /* NOTREACHED */ 573 } 574 575 /* 576 * To allow for greater ease of use, some vnodes may be orphaned when 577 * Venus dies. Certain operations should still be allowed to go 578 * through, but without propagating ophan-ness. So this function will 579 * get a new vnode for the file from the current run of Venus. */ 580 581 int 582 getNewVnode(vpp) 583 struct vnode **vpp; 584 { 585 struct cfid cfid; 586 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 587 588 ENTRY; 589 590 cfid.cfid_len = (short)sizeof(ViceFid); 591 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 592 /* XXX ? */ 593 594 /* We're guessing that if set, the 1st element on the list is a 595 * valid vnode to use. If not, return ENODEV as venus is dead. 596 */ 597 if (mi->mi_vfsp == NULL) 598 return ENODEV; 599 600 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 601 NULL, NULL); 602 } 603 604 #include <ufs/ufs/quota.h> 605 #include <ufs/ufs/ufsmount.h> 606 /* get the mount structure corresponding to a given device. Assume 607 * device corresponds to a UFS. Return NULL if no device is found. 608 */ 609 struct mount *devtomp(dev) 610 dev_t dev; 611 { 612 struct mount *mp, *nmp; 613 614 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 615 nmp = mp->mnt_list.cqe_next; 616 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 617 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 618 /* mount corresponds to UFS and the device matches one we want */ 619 return(mp); 620 } 621 } 622 /* mount structure wasn't found */ 623 return(NULL); 624 } 625
Indexes created Wed Sep 24 05:09:52 GMT 2025