coda_vfsops.c revision 1.13
1 /* $NetBSD: coda_vfsops.c,v 1.13 2001/09/15 16:12:55 chs 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 NULL, 113 coda_done, 114 coda_sysctl, 115 (int (*)(void)) eopnotsupp, 116 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 117 eopnotsupp, 118 coda_vnodeopv_descs, 119 0 120 }; 121 122 int 123 coda_vfsopstats_init(void) 124 { 125 int i; 126 127 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 128 coda_vfsopstats[i].opcode = i; 129 coda_vfsopstats[i].entries = 0; 130 coda_vfsopstats[i].sat_intrn = 0; 131 coda_vfsopstats[i].unsat_intrn = 0; 132 coda_vfsopstats[i].gen_intrn = 0; 133 } 134 135 return 0; 136 } 137 138 /* 139 * cfs mount vfsop 140 * Set up mount info record and attach it to vfs struct. 141 */ 142 /*ARGSUSED*/ 143 int 144 coda_mount(vfsp, path, data, ndp, p) 145 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 146 const char *path; /* path covered: ignored by the fs-layer */ 147 void *data; /* Need to define a data type for this in netbsd? */ 148 struct nameidata *ndp; /* Clobber this to lookup the device name */ 149 struct proc *p; /* The ever-famous proc pointer */ 150 { 151 struct vnode *dvp; 152 struct cnode *cp; 153 dev_t dev; 154 struct coda_mntinfo *mi; 155 struct vnode *rootvp; 156 ViceFid rootfid; 157 ViceFid ctlfid; 158 int error; 159 160 ENTRY; 161 162 coda_vfsopstats_init(); 163 coda_vnodeopstats_init(); 164 165 MARK_ENTRY(CODA_MOUNT_STATS); 166 if (CODA_MOUNTED(vfsp)) { 167 MARK_INT_FAIL(CODA_MOUNT_STATS); 168 return(EBUSY); 169 } 170 171 /* Validate mount device. Similar to getmdev(). */ 172 173 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 174 error = namei(ndp); 175 dvp = ndp->ni_vp; 176 177 if (error) { 178 MARK_INT_FAIL(CODA_MOUNT_STATS); 179 return (error); 180 } 181 if (dvp->v_type != VCHR) { 182 MARK_INT_FAIL(CODA_MOUNT_STATS); 183 vrele(dvp); 184 return(ENXIO); 185 } 186 dev = dvp->v_specinfo->si_rdev; 187 vrele(dvp); 188 if (major(dev) >= nchrdev || major(dev) < 0) { 189 MARK_INT_FAIL(CODA_MOUNT_STATS); 190 return(ENXIO); 191 } 192 193 /* 194 * See if the device table matches our expectations. 195 */ 196 if (cdevsw[major(dev)].d_open != vc_nb_open) 197 { 198 MARK_INT_FAIL(CODA_MOUNT_STATS); 199 return(ENXIO); 200 } 201 202 if (minor(dev) >= NVCODA || minor(dev) < 0) { 203 MARK_INT_FAIL(CODA_MOUNT_STATS); 204 return(ENXIO); 205 } 206 207 /* 208 * Initialize the mount record and link it to the vfs struct 209 */ 210 mi = &coda_mnttbl[minor(dev)]; 211 212 if (!VC_OPEN(&mi->mi_vcomm)) { 213 MARK_INT_FAIL(CODA_MOUNT_STATS); 214 return(ENODEV); 215 } 216 217 /* No initialization (here) of mi_vcomm! */ 218 vfsp->mnt_data = (qaddr_t)mi; 219 vfsp->mnt_stat.f_fsid.val[0] = 0; 220 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 221 mi->mi_vfsp = vfsp; 222 223 /* 224 * Make a root vnode to placate the Vnode interface, but don't 225 * actually make the CODA_ROOT call to venus until the first call 226 * to coda_root in case a server is down while venus is starting. 227 */ 228 rootfid.Volume = 0; 229 rootfid.Vnode = 0; 230 rootfid.Unique = 0; 231 cp = make_coda_node(&rootfid, vfsp, VDIR); 232 rootvp = CTOV(cp); 233 rootvp->v_flag |= VROOT; 234 235 ctlfid.Volume = CTL_VOL; 236 ctlfid.Vnode = CTL_VNO; 237 ctlfid.Unique = CTL_UNI; 238 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 239 The above code seems to cause a loop in the cnode links. 240 I don't totally understand when it happens, it is caught 241 when closing down the system. 242 */ 243 cp = make_coda_node(&ctlfid, 0, VCHR); 244 245 coda_ctlvp = CTOV(cp); 246 247 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 248 mi->mi_vfsp = vfsp; 249 mi->mi_rootvp = rootvp; 250 251 /* set filesystem block size */ 252 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 253 254 /* error is currently guaranteed to be zero, but in case some 255 code changes... */ 256 CODADEBUG(1, 257 myprintf(("coda_mount returned %d\n",error));); 258 if (error) 259 MARK_INT_FAIL(CODA_MOUNT_STATS); 260 else 261 MARK_INT_SAT(CODA_MOUNT_STATS); 262 263 return(error); 264 } 265 266 int 267 coda_start(vfsp, flags, p) 268 struct mount *vfsp; 269 int flags; 270 struct proc *p; 271 { 272 ENTRY; 273 return (0); 274 } 275 276 int 277 coda_unmount(vfsp, mntflags, p) 278 struct mount *vfsp; 279 int mntflags; 280 struct proc *p; 281 { 282 struct coda_mntinfo *mi = vftomi(vfsp); 283 int active, error = 0; 284 285 ENTRY; 286 MARK_ENTRY(CODA_UMOUNT_STATS); 287 if (!CODA_MOUNTED(vfsp)) { 288 MARK_INT_FAIL(CODA_UMOUNT_STATS); 289 return(EINVAL); 290 } 291 292 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 293 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 294 return (EBUSY); /* Venus is still running */ 295 296 #ifdef DEBUG 297 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 298 #endif 299 vrele(mi->mi_rootvp); 300 301 active = coda_kill(vfsp, NOT_DOWNCALL); 302 mi->mi_rootvp->v_flag &= ~VROOT; 303 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 304 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 305 error = 0; 306 307 /* I'm going to take this out to allow lookups to go through. I'm 308 * not sure it's important anyway. -- DCS 2/2/94 309 */ 310 /* vfsp->VFS_DATA = NULL; */ 311 312 /* No more vfsp's to hold onto */ 313 mi->mi_vfsp = NULL; 314 mi->mi_rootvp = NULL; 315 316 if (error) 317 MARK_INT_FAIL(CODA_UMOUNT_STATS); 318 else 319 MARK_INT_SAT(CODA_UMOUNT_STATS); 320 321 return(error); 322 } 323 return (EINVAL); 324 } 325 326 /* 327 * find root of cfs 328 */ 329 int 330 coda_root(vfsp, vpp) 331 struct mount *vfsp; 332 struct vnode **vpp; 333 { 334 struct coda_mntinfo *mi = vftomi(vfsp); 335 struct vnode **result; 336 int error; 337 struct proc *p = curproc; /* XXX - bnoble */ 338 ViceFid VFid; 339 340 ENTRY; 341 MARK_ENTRY(CODA_ROOT_STATS); 342 result = NULL; 343 344 if (vfsp == mi->mi_vfsp) { 345 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 346 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 347 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 348 { /* Found valid root. */ 349 *vpp = mi->mi_rootvp; 350 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 351 vref(*vpp); 352 vn_lock(*vpp, LK_EXCLUSIVE); 353 MARK_INT_SAT(CODA_ROOT_STATS); 354 return(0); 355 } 356 } 357 358 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 359 360 if (!error) { 361 /* 362 * Save the new rootfid in the cnode, and rehash the cnode into the 363 * cnode hash with the new fid key. 364 */ 365 coda_unsave(VTOC(mi->mi_rootvp)); 366 VTOC(mi->mi_rootvp)->c_fid = VFid; 367 coda_save(VTOC(mi->mi_rootvp)); 368 369 *vpp = mi->mi_rootvp; 370 vref(*vpp); 371 vn_lock(*vpp, LK_EXCLUSIVE); 372 MARK_INT_SAT(CODA_ROOT_STATS); 373 goto exit; 374 } else if (error == ENODEV || error == EINTR) { 375 /* Gross hack here! */ 376 /* 377 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 378 * ENODEV. Return the uninitialized root vnode to allow vfs 379 * operations such as unmount to continue. Without this hack, 380 * there is no way to do an unmount if Venus dies before a 381 * successful CODA_ROOT call is done. All vnode operations 382 * will fail. 383 */ 384 *vpp = mi->mi_rootvp; 385 vref(*vpp); 386 vn_lock(*vpp, LK_EXCLUSIVE); 387 MARK_INT_FAIL(CODA_ROOT_STATS); 388 error = 0; 389 goto exit; 390 } else { 391 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 392 MARK_INT_FAIL(CODA_ROOT_STATS); 393 394 goto exit; 395 } 396 exit: 397 return(error); 398 } 399 400 int 401 coda_quotactl(vfsp, cmd, uid, arg, p) 402 struct mount *vfsp; 403 int cmd; 404 uid_t uid; 405 caddr_t arg; 406 struct proc *p; 407 { 408 ENTRY; 409 return (EOPNOTSUPP); 410 } 411 412 /* 413 * Get file system statistics. 414 */ 415 int 416 coda_nb_statfs(vfsp, sbp, p) 417 struct mount *vfsp; 418 struct statfs *sbp; 419 struct proc *p; 420 { 421 ENTRY; 422 /* MARK_ENTRY(CODA_STATFS_STATS); */ 423 if (!CODA_MOUNTED(vfsp)) { 424 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/ 425 return(EINVAL); 426 } 427 428 memset(sbp, 0, sizeof(struct statfs)); 429 /* XXX - what to do about f_flags, others? --bnoble */ 430 /* Below This is what AFS does 431 #define NB_SFS_SIZ 0x895440 432 */ 433 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 434 sbp->f_type = 0; 435 sbp->f_bsize = 8192; /* XXX */ 436 sbp->f_iosize = 8192; /* XXX */ 437 #define NB_SFS_SIZ 0x8AB75D 438 sbp->f_blocks = NB_SFS_SIZ; 439 sbp->f_bfree = NB_SFS_SIZ; 440 sbp->f_bavail = NB_SFS_SIZ; 441 sbp->f_files = NB_SFS_SIZ; 442 sbp->f_ffree = NB_SFS_SIZ; 443 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 444 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 445 strcpy(sbp->f_mntonname, "/coda"); 446 strcpy(sbp->f_mntfromname, "CODA"); 447 /* MARK_INT_SAT(CODA_STATFS_STATS); */ 448 return(0); 449 } 450 451 /* 452 * Flush any pending I/O. 453 */ 454 int 455 coda_sync(vfsp, waitfor, cred, p) 456 struct mount *vfsp; 457 int waitfor; 458 struct ucred *cred; 459 struct proc *p; 460 { 461 ENTRY; 462 MARK_ENTRY(CODA_SYNC_STATS); 463 MARK_INT_SAT(CODA_SYNC_STATS); 464 return(0); 465 } 466 467 int 468 coda_vget(vfsp, ino, vpp) 469 struct mount *vfsp; 470 ino_t ino; 471 struct vnode **vpp; 472 { 473 ENTRY; 474 return (EOPNOTSUPP); 475 } 476 477 /* 478 * fhtovp is now what vget used to be in 4.3-derived systems. For 479 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 480 * a type-specific fid. 481 */ 482 int 483 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 484 struct mount *vfsp; 485 struct fid *fhp; 486 struct mbuf *nam; 487 struct vnode **vpp; 488 int *exflagsp; 489 struct ucred **creadanonp; 490 { 491 struct cfid *cfid = (struct cfid *)fhp; 492 struct cnode *cp = 0; 493 int error; 494 struct proc *p = curproc; /* XXX -mach */ 495 ViceFid VFid; 496 int vtype; 497 498 ENTRY; 499 500 MARK_ENTRY(CODA_VGET_STATS); 501 /* Check for vget of control object. */ 502 if (IS_CTL_FID(&cfid->cfid_fid)) { 503 *vpp = coda_ctlvp; 504 vref(coda_ctlvp); 505 MARK_INT_SAT(CODA_VGET_STATS); 506 return(0); 507 } 508 509 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 510 511 if (error) { 512 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 513 *vpp = (struct vnode *)0; 514 } else { 515 CODADEBUG(CODA_VGET, 516 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 517 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 518 519 cp = make_coda_node(&VFid, vfsp, vtype); 520 *vpp = CTOV(cp); 521 } 522 return(error); 523 } 524 525 int 526 coda_vptofh(vnp, fidp) 527 struct vnode *vnp; 528 struct fid *fidp; 529 { 530 ENTRY; 531 return (EOPNOTSUPP); 532 } 533 534 void 535 coda_init(void) 536 { 537 ENTRY; 538 } 539 540 void 541 coda_done(void) 542 { 543 ENTRY; 544 } 545 546 int 547 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 548 int *name; 549 u_int namelen; 550 void *oldp; 551 size_t *oldlp; 552 void *newp; 553 size_t newl; 554 struct proc *p; 555 { 556 557 /* all sysctl names at this level are terminal */ 558 if (namelen != 1) 559 return (ENOTDIR); /* overloaded */ 560 561 switch (name[0]) { 562 /* 563 case FFS_CLUSTERREAD: 564 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 565 */ 566 default: 567 return (EOPNOTSUPP); 568 } 569 /* NOTREACHED */ 570 } 571 572 /* 573 * To allow for greater ease of use, some vnodes may be orphaned when 574 * Venus dies. Certain operations should still be allowed to go 575 * through, but without propagating ophan-ness. So this function will 576 * get a new vnode for the file from the current run of Venus. */ 577 578 int 579 getNewVnode(vpp) 580 struct vnode **vpp; 581 { 582 struct cfid cfid; 583 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 584 585 ENTRY; 586 587 cfid.cfid_len = (short)sizeof(ViceFid); 588 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 589 /* XXX ? */ 590 591 /* We're guessing that if set, the 1st element on the list is a 592 * valid vnode to use. If not, return ENODEV as venus is dead. 593 */ 594 if (mi->mi_vfsp == NULL) 595 return ENODEV; 596 597 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 598 NULL, NULL); 599 } 600 601 #include <ufs/ufs/quota.h> 602 #include <ufs/ufs/ufsmount.h> 603 /* get the mount structure corresponding to a given device. Assume 604 * device corresponds to a UFS. Return NULL if no device is found. 605 */ 606 struct mount *devtomp(dev) 607 dev_t dev; 608 { 609 struct mount *mp, *nmp; 610 611 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 612 nmp = mp->mnt_list.cqe_next; 613 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 614 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 615 /* mount corresponds to UFS and the device matches one we want */ 616 return(mp); 617 } 618 } 619 /* mount structure wasn't found */ 620 return(NULL); 621 } 622
Indexes created Thu Oct 02 01:09:59 GMT 2025