coda_vfsops.c revision 1.16
1 /* $NetBSD: coda_vfsops.c,v 1.16 2002/03/27 05:10:41 phil 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 1.16 2002/03/27 05:10:41 phil 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 int codadebug = 0; 75 76 int coda_vfsop_print_entry = 0; 77 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 78 79 struct vnode *coda_ctlvp; 80 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 81 82 /* structure to keep statistics of internally generated/satisfied calls */ 83 84 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 85 86 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 87 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 88 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 89 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 90 91 extern int coda_nc_initialized; /* Set if cache has been initialized */ 92 extern int vc_nb_open __P((dev_t, int, int, struct proc *)); 93 extern struct cdevsw cdevsw[]; /* For sanity check in coda_mount */ 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 ** )) 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, p) 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 proc *p; /* The ever-famous proc pointer */ 153 { 154 struct vnode *dvp; 155 struct cnode *cp; 156 dev_t dev; 157 struct coda_mntinfo *mi; 158 struct vnode *rootvp; 159 ViceFid rootfid; 160 ViceFid ctlfid; 161 int error; 162 163 ENTRY; 164 165 coda_vfsopstats_init(); 166 coda_vnodeopstats_init(); 167 168 MARK_ENTRY(CODA_MOUNT_STATS); 169 if (CODA_MOUNTED(vfsp)) { 170 MARK_INT_FAIL(CODA_MOUNT_STATS); 171 return(EBUSY); 172 } 173 174 /* Validate mount device. Similar to getmdev(). */ 175 176 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 177 error = namei(ndp); 178 dvp = ndp->ni_vp; 179 180 if (error) { 181 MARK_INT_FAIL(CODA_MOUNT_STATS); 182 return (error); 183 } 184 if (dvp->v_type != VCHR) { 185 MARK_INT_FAIL(CODA_MOUNT_STATS); 186 vrele(dvp); 187 return(ENXIO); 188 } 189 dev = dvp->v_specinfo->si_rdev; 190 vrele(dvp); 191 if (major(dev) >= nchrdev || major(dev) < 0) { 192 MARK_INT_FAIL(CODA_MOUNT_STATS); 193 return(ENXIO); 194 } 195 196 /* 197 * See if the device table matches our expectations. 198 */ 199 if (cdevsw[major(dev)].d_open != vc_nb_open) 200 { 201 MARK_INT_FAIL(CODA_MOUNT_STATS); 202 return(ENXIO); 203 } 204 205 if (minor(dev) >= NVCODA || minor(dev) < 0) { 206 MARK_INT_FAIL(CODA_MOUNT_STATS); 207 return(ENXIO); 208 } 209 210 /* 211 * Initialize the mount record and link it to the vfs struct 212 */ 213 mi = &coda_mnttbl[minor(dev)]; 214 215 if (!VC_OPEN(&mi->mi_vcomm)) { 216 MARK_INT_FAIL(CODA_MOUNT_STATS); 217 return(ENODEV); 218 } 219 220 /* No initialization (here) of mi_vcomm! */ 221 vfsp->mnt_data = (qaddr_t)mi; 222 vfsp->mnt_stat.f_fsid.val[0] = 0; 223 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 224 mi->mi_vfsp = vfsp; 225 226 /* 227 * Make a root vnode to placate the Vnode interface, but don't 228 * actually make the CODA_ROOT call to venus until the first call 229 * to coda_root in case a server is down while venus is starting. 230 */ 231 rootfid.Volume = 0; 232 rootfid.Vnode = 0; 233 rootfid.Unique = 0; 234 cp = make_coda_node(&rootfid, vfsp, VDIR); 235 rootvp = CTOV(cp); 236 rootvp->v_flag |= VROOT; 237 238 ctlfid.Volume = CTL_VOL; 239 ctlfid.Vnode = CTL_VNO; 240 ctlfid.Unique = CTL_UNI; 241 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 242 The above code seems to cause a loop in the cnode links. 243 I don't totally understand when it happens, it is caught 244 when closing down the system. 245 */ 246 cp = make_coda_node(&ctlfid, 0, VCHR); 247 248 coda_ctlvp = CTOV(cp); 249 250 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 251 mi->mi_vfsp = vfsp; 252 mi->mi_rootvp = rootvp; 253 254 /* set filesystem block size */ 255 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 256 257 /* error is currently guaranteed to be zero, but in case some 258 code changes... */ 259 CODADEBUG(1, 260 myprintf(("coda_mount returned %d\n",error));); 261 if (error) 262 MARK_INT_FAIL(CODA_MOUNT_STATS); 263 else 264 MARK_INT_SAT(CODA_MOUNT_STATS); 265 266 return(error); 267 } 268 269 int 270 coda_start(vfsp, flags, p) 271 struct mount *vfsp; 272 int flags; 273 struct proc *p; 274 { 275 ENTRY; 276 return (0); 277 } 278 279 int 280 coda_unmount(vfsp, mntflags, p) 281 struct mount *vfsp; 282 int mntflags; 283 struct proc *p; 284 { 285 struct coda_mntinfo *mi = vftomi(vfsp); 286 int active, error = 0; 287 288 ENTRY; 289 MARK_ENTRY(CODA_UMOUNT_STATS); 290 if (!CODA_MOUNTED(vfsp)) { 291 MARK_INT_FAIL(CODA_UMOUNT_STATS); 292 return(EINVAL); 293 } 294 295 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 296 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 297 return (EBUSY); /* Venus is still running */ 298 299 #ifdef DEBUG 300 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 301 #endif 302 vrele(mi->mi_rootvp); 303 304 active = coda_kill(vfsp, NOT_DOWNCALL); 305 mi->mi_rootvp->v_flag &= ~VROOT; 306 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 307 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 308 error = 0; 309 310 /* I'm going to take this out to allow lookups to go through. I'm 311 * not sure it's important anyway. -- DCS 2/2/94 312 */ 313 /* vfsp->VFS_DATA = NULL; */ 314 315 /* No more vfsp's to hold onto */ 316 mi->mi_vfsp = NULL; 317 mi->mi_rootvp = NULL; 318 319 if (error) 320 MARK_INT_FAIL(CODA_UMOUNT_STATS); 321 else 322 MARK_INT_SAT(CODA_UMOUNT_STATS); 323 324 return(error); 325 } 326 return (EINVAL); 327 } 328 329 /* 330 * find root of cfs 331 */ 332 int 333 coda_root(vfsp, vpp) 334 struct mount *vfsp; 335 struct vnode **vpp; 336 { 337 struct coda_mntinfo *mi = vftomi(vfsp); 338 struct vnode **result; 339 int error; 340 struct proc *p = curproc; /* XXX - bnoble */ 341 ViceFid VFid; 342 343 ENTRY; 344 MARK_ENTRY(CODA_ROOT_STATS); 345 result = NULL; 346 347 if (vfsp == mi->mi_vfsp) { 348 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 349 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 350 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 351 { /* Found valid root. */ 352 *vpp = mi->mi_rootvp; 353 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 354 vref(*vpp); 355 vn_lock(*vpp, LK_EXCLUSIVE); 356 MARK_INT_SAT(CODA_ROOT_STATS); 357 return(0); 358 } 359 } 360 361 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 362 363 if (!error) { 364 /* 365 * Save the new rootfid in the cnode, and rehash the cnode into the 366 * cnode hash with the new fid key. 367 */ 368 coda_unsave(VTOC(mi->mi_rootvp)); 369 VTOC(mi->mi_rootvp)->c_fid = VFid; 370 coda_save(VTOC(mi->mi_rootvp)); 371 372 *vpp = mi->mi_rootvp; 373 vref(*vpp); 374 vn_lock(*vpp, LK_EXCLUSIVE); 375 MARK_INT_SAT(CODA_ROOT_STATS); 376 goto exit; 377 } else if (error == ENODEV || error == EINTR) { 378 /* Gross hack here! */ 379 /* 380 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 381 * ENODEV. Return the uninitialized root vnode to allow vfs 382 * operations such as unmount to continue. Without this hack, 383 * there is no way to do an unmount if Venus dies before a 384 * successful CODA_ROOT call is done. All vnode operations 385 * will fail. 386 */ 387 *vpp = mi->mi_rootvp; 388 vref(*vpp); 389 vn_lock(*vpp, LK_EXCLUSIVE); 390 MARK_INT_FAIL(CODA_ROOT_STATS); 391 error = 0; 392 goto exit; 393 } else { 394 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 395 MARK_INT_FAIL(CODA_ROOT_STATS); 396 397 goto exit; 398 } 399 exit: 400 return(error); 401 } 402 403 int 404 coda_quotactl(vfsp, cmd, uid, arg, p) 405 struct mount *vfsp; 406 int cmd; 407 uid_t uid; 408 caddr_t arg; 409 struct proc *p; 410 { 411 ENTRY; 412 return (EOPNOTSUPP); 413 } 414 415 /* 416 * Get file system statistics. 417 */ 418 int 419 coda_nb_statfs(vfsp, sbp, p) 420 struct mount *vfsp; 421 struct statfs *sbp; 422 struct proc *p; 423 { 424 struct coda_statfs fsstat; 425 int error; 426 427 ENTRY; 428 MARK_ENTRY(CODA_STATFS_STATS); 429 if (!CODA_MOUNTED(vfsp)) { 430 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 431 return(EINVAL); 432 } 433 434 memset(sbp, 0, sizeof(struct statfs)); 435 /* XXX - what to do about f_flags, others? --bnoble */ 436 /* Below This is what AFS does 437 #define NB_SFS_SIZ 0x895440 438 */ 439 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 440 441 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 442 443 if (!error) { 444 sbp->f_type = 0; 445 sbp->f_bsize = 8192; /* XXX */ 446 sbp->f_iosize = 8192; /* XXX */ 447 sbp->f_blocks = fsstat.f_blocks; 448 sbp->f_bfree = fsstat.f_bfree; 449 sbp->f_bavail = fsstat.f_bavail; 450 sbp->f_files = fsstat.f_files; 451 sbp->f_ffree = fsstat.f_ffree; 452 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), 453 (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 454 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 455 strcpy(sbp->f_mntonname, "/coda"); 456 strcpy(sbp->f_mntfromname, "CODA"); 457 } 458 459 MARK_INT_SAT(CODA_STATFS_STATS); 460 return(error); 461 } 462 463 /* 464 * Flush any pending I/O. 465 */ 466 int 467 coda_sync(vfsp, waitfor, cred, p) 468 struct mount *vfsp; 469 int waitfor; 470 struct ucred *cred; 471 struct proc *p; 472 { 473 ENTRY; 474 MARK_ENTRY(CODA_SYNC_STATS); 475 MARK_INT_SAT(CODA_SYNC_STATS); 476 return(0); 477 } 478 479 int 480 coda_vget(vfsp, ino, vpp) 481 struct mount *vfsp; 482 ino_t ino; 483 struct vnode **vpp; 484 { 485 ENTRY; 486 return (EOPNOTSUPP); 487 } 488 489 /* 490 * fhtovp is now what vget used to be in 4.3-derived systems. For 491 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 492 * a type-specific fid. 493 */ 494 int 495 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 496 struct mount *vfsp; 497 struct fid *fhp; 498 struct mbuf *nam; 499 struct vnode **vpp; 500 int *exflagsp; 501 struct ucred **creadanonp; 502 { 503 struct cfid *cfid = (struct cfid *)fhp; 504 struct cnode *cp = 0; 505 int error; 506 struct proc *p = curproc; /* XXX -mach */ 507 ViceFid VFid; 508 int vtype; 509 510 ENTRY; 511 512 MARK_ENTRY(CODA_VGET_STATS); 513 /* Check for vget of control object. */ 514 if (IS_CTL_FID(&cfid->cfid_fid)) { 515 *vpp = coda_ctlvp; 516 vref(coda_ctlvp); 517 MARK_INT_SAT(CODA_VGET_STATS); 518 return(0); 519 } 520 521 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 522 523 if (error) { 524 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 525 *vpp = (struct vnode *)0; 526 } else { 527 CODADEBUG(CODA_VGET, 528 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 529 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 530 531 cp = make_coda_node(&VFid, vfsp, vtype); 532 *vpp = CTOV(cp); 533 } 534 return(error); 535 } 536 537 int 538 coda_vptofh(vnp, fidp) 539 struct vnode *vnp; 540 struct fid *fidp; 541 { 542 ENTRY; 543 return (EOPNOTSUPP); 544 } 545 546 void 547 coda_init(void) 548 { 549 ENTRY; 550 } 551 552 void 553 coda_done(void) 554 { 555 ENTRY; 556 } 557 558 int 559 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 560 int *name; 561 u_int namelen; 562 void *oldp; 563 size_t *oldlp; 564 void *newp; 565 size_t newl; 566 struct proc *p; 567 { 568 569 /* all sysctl names at this level are terminal */ 570 if (namelen != 1) 571 return (ENOTDIR); /* overloaded */ 572 573 switch (name[0]) { 574 /* 575 case FFS_CLUSTERREAD: 576 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 577 */ 578 default: 579 return (EOPNOTSUPP); 580 } 581 /* NOTREACHED */ 582 } 583 584 /* 585 * To allow for greater ease of use, some vnodes may be orphaned when 586 * Venus dies. Certain operations should still be allowed to go 587 * through, but without propagating ophan-ness. So this function will 588 * get a new vnode for the file from the current run of Venus. */ 589 590 int 591 getNewVnode(vpp) 592 struct vnode **vpp; 593 { 594 struct cfid cfid; 595 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 596 597 ENTRY; 598 599 cfid.cfid_len = (short)sizeof(ViceFid); 600 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 601 /* XXX ? */ 602 603 /* We're guessing that if set, the 1st element on the list is a 604 * valid vnode to use. If not, return ENODEV as venus is dead. 605 */ 606 if (mi->mi_vfsp == NULL) 607 return ENODEV; 608 609 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 610 NULL, NULL); 611 } 612 613 #include <ufs/ufs/quota.h> 614 #include <ufs/ufs/ufsmount.h> 615 /* get the mount structure corresponding to a given device. Assume 616 * device corresponds to a UFS. Return NULL if no device is found. 617 */ 618 struct mount *devtomp(dev) 619 dev_t dev; 620 { 621 struct mount *mp, *nmp; 622 623 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 624 nmp = mp->mnt_list.cqe_next; 625 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 626 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 627 /* mount corresponds to UFS and the device matches one we want */ 628 return(mp); 629 } 630 } 631 /* mount structure wasn't found */ 632 return(NULL); 633 } 634
Indexes created Tue Sep 23 23:09:58 GMT 2025