coda_vfsops.c revision 1.19
1 /* $NetBSD: coda_vfsops.c,v 1.19 2002/09/21 18:10:34 christos 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 1.19 2002/09/21 18:10:34 christos 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 const struct cdevsw vcoda_cdevsw; 93 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 94 95 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 96 &coda_vnodeop_opv_desc, 97 NULL, 98 }; 99 100 struct vfsops coda_vfsops = { 101 MOUNT_CODA, 102 coda_mount, 103 coda_start, 104 coda_unmount, 105 coda_root, 106 coda_quotactl, 107 coda_nb_statfs, 108 coda_sync, 109 coda_vget, 110 (int (*) (struct mount *, struct fid *, struct vnode ** )) 111 eopnotsupp, 112 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 113 coda_init, 114 NULL, 115 coda_done, 116 coda_sysctl, 117 (int (*)(void)) eopnotsupp, 118 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 119 eopnotsupp, 120 coda_vnodeopv_descs, 121 0 122 }; 123 124 int 125 coda_vfsopstats_init(void) 126 { 127 int i; 128 129 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 130 coda_vfsopstats[i].opcode = i; 131 coda_vfsopstats[i].entries = 0; 132 coda_vfsopstats[i].sat_intrn = 0; 133 coda_vfsopstats[i].unsat_intrn = 0; 134 coda_vfsopstats[i].gen_intrn = 0; 135 } 136 137 return 0; 138 } 139 140 /* 141 * cfs mount vfsop 142 * Set up mount info record and attach it to vfs struct. 143 */ 144 /*ARGSUSED*/ 145 int 146 coda_mount(vfsp, path, data, ndp, p) 147 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 148 const char *path; /* path covered: ignored by the fs-layer */ 149 void *data; /* Need to define a data type for this in netbsd? */ 150 struct nameidata *ndp; /* Clobber this to lookup the device name */ 151 struct proc *p; /* The ever-famous proc pointer */ 152 { 153 struct vnode *dvp; 154 struct cnode *cp; 155 dev_t dev; 156 struct coda_mntinfo *mi; 157 struct vnode *rootvp; 158 const struct cdevsw *cdev; 159 ViceFid rootfid; 160 ViceFid ctlfid; 161 int error; 162 163 if (vfsp->mnt_flag & MNT_GETARGS) 164 return 0; 165 ENTRY; 166 167 coda_vfsopstats_init(); 168 coda_vnodeopstats_init(); 169 170 MARK_ENTRY(CODA_MOUNT_STATS); 171 if (CODA_MOUNTED(vfsp)) { 172 MARK_INT_FAIL(CODA_MOUNT_STATS); 173 return(EBUSY); 174 } 175 176 /* Validate mount device. Similar to getmdev(). */ 177 178 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 179 error = namei(ndp); 180 dvp = ndp->ni_vp; 181 182 if (error) { 183 MARK_INT_FAIL(CODA_MOUNT_STATS); 184 return (error); 185 } 186 if (dvp->v_type != VCHR) { 187 MARK_INT_FAIL(CODA_MOUNT_STATS); 188 vrele(dvp); 189 return(ENXIO); 190 } 191 dev = dvp->v_specinfo->si_rdev; 192 vrele(dvp); 193 cdev = cdevsw_lookup(dev); 194 if (cdev == NULL) { 195 MARK_INT_FAIL(CODA_MOUNT_STATS); 196 return(ENXIO); 197 } 198 199 /* 200 * See if the device table matches our expectations. 201 */ 202 if (cdev != &vcoda_cdevsw) 203 { 204 MARK_INT_FAIL(CODA_MOUNT_STATS); 205 return(ENXIO); 206 } 207 208 if (minor(dev) >= NVCODA || minor(dev) < 0) { 209 MARK_INT_FAIL(CODA_MOUNT_STATS); 210 return(ENXIO); 211 } 212 213 /* 214 * Initialize the mount record and link it to the vfs struct 215 */ 216 mi = &coda_mnttbl[minor(dev)]; 217 218 if (!VC_OPEN(&mi->mi_vcomm)) { 219 MARK_INT_FAIL(CODA_MOUNT_STATS); 220 return(ENODEV); 221 } 222 223 /* No initialization (here) of mi_vcomm! */ 224 vfsp->mnt_data = mi; 225 vfsp->mnt_stat.f_fsid.val[0] = 0; 226 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 227 mi->mi_vfsp = vfsp; 228 229 /* 230 * Make a root vnode to placate the Vnode interface, but don't 231 * actually make the CODA_ROOT call to venus until the first call 232 * to coda_root in case a server is down while venus is starting. 233 */ 234 rootfid.Volume = 0; 235 rootfid.Vnode = 0; 236 rootfid.Unique = 0; 237 cp = make_coda_node(&rootfid, vfsp, VDIR); 238 rootvp = CTOV(cp); 239 rootvp->v_flag |= VROOT; 240 241 ctlfid.Volume = CTL_VOL; 242 ctlfid.Vnode = CTL_VNO; 243 ctlfid.Unique = CTL_UNI; 244 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 245 The above code seems to cause a loop in the cnode links. 246 I don't totally understand when it happens, it is caught 247 when closing down the system. 248 */ 249 cp = make_coda_node(&ctlfid, 0, VCHR); 250 251 coda_ctlvp = CTOV(cp); 252 253 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 254 mi->mi_vfsp = vfsp; 255 mi->mi_rootvp = rootvp; 256 257 /* set filesystem block size */ 258 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 259 260 /* error is currently guaranteed to be zero, but in case some 261 code changes... */ 262 CODADEBUG(1, 263 myprintf(("coda_mount returned %d\n",error));); 264 if (error) 265 MARK_INT_FAIL(CODA_MOUNT_STATS); 266 else 267 MARK_INT_SAT(CODA_MOUNT_STATS); 268 269 return(error); 270 } 271 272 int 273 coda_start(vfsp, flags, p) 274 struct mount *vfsp; 275 int flags; 276 struct proc *p; 277 { 278 ENTRY; 279 return (0); 280 } 281 282 int 283 coda_unmount(vfsp, mntflags, p) 284 struct mount *vfsp; 285 int mntflags; 286 struct proc *p; 287 { 288 struct coda_mntinfo *mi = vftomi(vfsp); 289 int active, error = 0; 290 291 ENTRY; 292 MARK_ENTRY(CODA_UMOUNT_STATS); 293 if (!CODA_MOUNTED(vfsp)) { 294 MARK_INT_FAIL(CODA_UMOUNT_STATS); 295 return(EINVAL); 296 } 297 298 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 299 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 300 return (EBUSY); /* Venus is still running */ 301 302 #ifdef DEBUG 303 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 304 #endif 305 vrele(mi->mi_rootvp); 306 307 active = coda_kill(vfsp, NOT_DOWNCALL); 308 mi->mi_rootvp->v_flag &= ~VROOT; 309 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 310 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 311 error = 0; 312 313 /* I'm going to take this out to allow lookups to go through. I'm 314 * not sure it's important anyway. -- DCS 2/2/94 315 */ 316 /* vfsp->VFS_DATA = NULL; */ 317 318 /* No more vfsp's to hold onto */ 319 mi->mi_vfsp = NULL; 320 mi->mi_rootvp = NULL; 321 322 if (error) 323 MARK_INT_FAIL(CODA_UMOUNT_STATS); 324 else 325 MARK_INT_SAT(CODA_UMOUNT_STATS); 326 327 return(error); 328 } 329 return (EINVAL); 330 } 331 332 /* 333 * find root of cfs 334 */ 335 int 336 coda_root(vfsp, vpp) 337 struct mount *vfsp; 338 struct vnode **vpp; 339 { 340 struct coda_mntinfo *mi = vftomi(vfsp); 341 struct vnode **result; 342 int error; 343 struct proc *p = curproc; /* XXX - bnoble */ 344 ViceFid VFid; 345 346 ENTRY; 347 MARK_ENTRY(CODA_ROOT_STATS); 348 result = NULL; 349 350 if (vfsp == mi->mi_vfsp) { 351 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 352 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 353 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 354 { /* Found valid root. */ 355 *vpp = mi->mi_rootvp; 356 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 357 vref(*vpp); 358 vn_lock(*vpp, LK_EXCLUSIVE); 359 MARK_INT_SAT(CODA_ROOT_STATS); 360 return(0); 361 } 362 } 363 364 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 365 366 if (!error) { 367 /* 368 * Save the new rootfid in the cnode, and rehash the cnode into the 369 * cnode hash with the new fid key. 370 */ 371 coda_unsave(VTOC(mi->mi_rootvp)); 372 VTOC(mi->mi_rootvp)->c_fid = VFid; 373 coda_save(VTOC(mi->mi_rootvp)); 374 375 *vpp = mi->mi_rootvp; 376 vref(*vpp); 377 vn_lock(*vpp, LK_EXCLUSIVE); 378 MARK_INT_SAT(CODA_ROOT_STATS); 379 goto exit; 380 } else if (error == ENODEV || error == EINTR) { 381 /* Gross hack here! */ 382 /* 383 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 384 * ENODEV. Return the uninitialized root vnode to allow vfs 385 * operations such as unmount to continue. Without this hack, 386 * there is no way to do an unmount if Venus dies before a 387 * successful CODA_ROOT call is done. All vnode operations 388 * will fail. 389 */ 390 *vpp = mi->mi_rootvp; 391 vref(*vpp); 392 vn_lock(*vpp, LK_EXCLUSIVE); 393 MARK_INT_FAIL(CODA_ROOT_STATS); 394 error = 0; 395 goto exit; 396 } else { 397 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 398 MARK_INT_FAIL(CODA_ROOT_STATS); 399 400 goto exit; 401 } 402 exit: 403 return(error); 404 } 405 406 int 407 coda_quotactl(vfsp, cmd, uid, arg, p) 408 struct mount *vfsp; 409 int cmd; 410 uid_t uid; 411 caddr_t arg; 412 struct proc *p; 413 { 414 ENTRY; 415 return (EOPNOTSUPP); 416 } 417 418 /* 419 * Get file system statistics. 420 */ 421 int 422 coda_nb_statfs(vfsp, sbp, p) 423 struct mount *vfsp; 424 struct statfs *sbp; 425 struct proc *p; 426 { 427 struct coda_statfs fsstat; 428 int error; 429 430 ENTRY; 431 MARK_ENTRY(CODA_STATFS_STATS); 432 if (!CODA_MOUNTED(vfsp)) { 433 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 434 return(EINVAL); 435 } 436 437 memset(sbp, 0, sizeof(struct statfs)); 438 /* XXX - what to do about f_flags, others? --bnoble */ 439 /* Below This is what AFS does 440 #define NB_SFS_SIZ 0x895440 441 */ 442 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 443 444 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 445 446 if (!error) { 447 sbp->f_type = 0; 448 sbp->f_bsize = 8192; /* XXX */ 449 sbp->f_iosize = 8192; /* XXX */ 450 sbp->f_blocks = fsstat.f_blocks; 451 sbp->f_bfree = fsstat.f_bfree; 452 sbp->f_bavail = fsstat.f_bavail; 453 sbp->f_files = fsstat.f_files; 454 sbp->f_ffree = fsstat.f_ffree; 455 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), 456 (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 457 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 458 strcpy(sbp->f_mntonname, "/coda"); 459 strcpy(sbp->f_mntfromname, "CODA"); 460 } 461 462 MARK_INT_SAT(CODA_STATFS_STATS); 463 return(error); 464 } 465 466 /* 467 * Flush any pending I/O. 468 */ 469 int 470 coda_sync(vfsp, waitfor, cred, p) 471 struct mount *vfsp; 472 int waitfor; 473 struct ucred *cred; 474 struct proc *p; 475 { 476 ENTRY; 477 MARK_ENTRY(CODA_SYNC_STATS); 478 MARK_INT_SAT(CODA_SYNC_STATS); 479 return(0); 480 } 481 482 int 483 coda_vget(vfsp, ino, vpp) 484 struct mount *vfsp; 485 ino_t ino; 486 struct vnode **vpp; 487 { 488 ENTRY; 489 return (EOPNOTSUPP); 490 } 491 492 /* 493 * fhtovp is now what vget used to be in 4.3-derived systems. For 494 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 495 * a type-specific fid. 496 */ 497 int 498 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 499 struct mount *vfsp; 500 struct fid *fhp; 501 struct mbuf *nam; 502 struct vnode **vpp; 503 int *exflagsp; 504 struct ucred **creadanonp; 505 { 506 struct cfid *cfid = (struct cfid *)fhp; 507 struct cnode *cp = 0; 508 int error; 509 struct proc *p = curproc; /* XXX -mach */ 510 ViceFid VFid; 511 int vtype; 512 513 ENTRY; 514 515 MARK_ENTRY(CODA_VGET_STATS); 516 /* Check for vget of control object. */ 517 if (IS_CTL_FID(&cfid->cfid_fid)) { 518 *vpp = coda_ctlvp; 519 vref(coda_ctlvp); 520 MARK_INT_SAT(CODA_VGET_STATS); 521 return(0); 522 } 523 524 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 525 526 if (error) { 527 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 528 *vpp = (struct vnode *)0; 529 } else { 530 CODADEBUG(CODA_VGET, 531 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 532 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 533 534 cp = make_coda_node(&VFid, vfsp, vtype); 535 *vpp = CTOV(cp); 536 } 537 return(error); 538 } 539 540 int 541 coda_vptofh(vnp, fidp) 542 struct vnode *vnp; 543 struct fid *fidp; 544 { 545 ENTRY; 546 return (EOPNOTSUPP); 547 } 548 549 void 550 coda_init(void) 551 { 552 ENTRY; 553 } 554 555 void 556 coda_done(void) 557 { 558 ENTRY; 559 } 560 561 int 562 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 563 int *name; 564 u_int namelen; 565 void *oldp; 566 size_t *oldlp; 567 void *newp; 568 size_t newl; 569 struct proc *p; 570 { 571 572 /* all sysctl names at this level are terminal */ 573 if (namelen != 1) 574 return (ENOTDIR); /* overloaded */ 575 576 switch (name[0]) { 577 /* 578 case FFS_CLUSTERREAD: 579 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 580 */ 581 default: 582 return (EOPNOTSUPP); 583 } 584 /* NOTREACHED */ 585 } 586 587 /* 588 * To allow for greater ease of use, some vnodes may be orphaned when 589 * Venus dies. Certain operations should still be allowed to go 590 * through, but without propagating ophan-ness. So this function will 591 * get a new vnode for the file from the current run of Venus. */ 592 593 int 594 getNewVnode(vpp) 595 struct vnode **vpp; 596 { 597 struct cfid cfid; 598 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 599 600 ENTRY; 601 602 cfid.cfid_len = (short)sizeof(ViceFid); 603 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 604 /* XXX ? */ 605 606 /* We're guessing that if set, the 1st element on the list is a 607 * valid vnode to use. If not, return ENODEV as venus is dead. 608 */ 609 if (mi->mi_vfsp == NULL) 610 return ENODEV; 611 612 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 613 NULL, NULL); 614 } 615 616 #include <ufs/ufs/quota.h> 617 #include <ufs/ufs/ufsmount.h> 618 /* get the mount structure corresponding to a given device. Assume 619 * device corresponds to a UFS. Return NULL if no device is found. 620 */ 621 struct mount *devtomp(dev) 622 dev_t dev; 623 { 624 struct mount *mp, *nmp; 625 626 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 627 nmp = mp->mnt_list.cqe_next; 628 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 629 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 630 /* mount corresponds to UFS and the device matches one we want */ 631 return(mp); 632 } 633 } 634 /* mount structure wasn't found */ 635 return(NULL); 636 } 637
Indexes created Wed Sep 24 05:09:52 GMT 2025