coda_vfsops.c revision 1.20
1 /* $NetBSD: coda_vfsops.c,v 1.20 2002/12/26 12:40:01 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 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: coda_vfsops.c,v 1.20 2002/12/26 12:40:01 jdolecek 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 const struct cdevsw vcoda_cdevsw; 92 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 93 94 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 95 &coda_vnodeop_opv_desc, 96 NULL, 97 }; 98 99 struct vfsops coda_vfsops = { 100 MOUNT_CODA, 101 coda_mount, 102 coda_start, 103 coda_unmount, 104 coda_root, 105 coda_quotactl, 106 coda_nb_statfs, 107 coda_sync, 108 coda_vget, 109 (int (*) (struct mount *, struct fid *, struct vnode ** )) 110 eopnotsupp, 111 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 112 coda_init, 113 NULL, 114 coda_done, 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 const struct cdevsw *cdev; 158 ViceFid rootfid; 159 ViceFid ctlfid; 160 int error; 161 162 if (vfsp->mnt_flag & MNT_GETARGS) 163 return 0; 164 ENTRY; 165 166 coda_vfsopstats_init(); 167 coda_vnodeopstats_init(); 168 169 MARK_ENTRY(CODA_MOUNT_STATS); 170 if (CODA_MOUNTED(vfsp)) { 171 MARK_INT_FAIL(CODA_MOUNT_STATS); 172 return(EBUSY); 173 } 174 175 /* Validate mount device. Similar to getmdev(). */ 176 177 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 178 error = namei(ndp); 179 dvp = ndp->ni_vp; 180 181 if (error) { 182 MARK_INT_FAIL(CODA_MOUNT_STATS); 183 return (error); 184 } 185 if (dvp->v_type != VCHR) { 186 MARK_INT_FAIL(CODA_MOUNT_STATS); 187 vrele(dvp); 188 return(ENXIO); 189 } 190 dev = dvp->v_specinfo->si_rdev; 191 vrele(dvp); 192 cdev = cdevsw_lookup(dev); 193 if (cdev == NULL) { 194 MARK_INT_FAIL(CODA_MOUNT_STATS); 195 return(ENXIO); 196 } 197 198 /* 199 * See if the device table matches our expectations. 200 */ 201 if (cdev != &vcoda_cdevsw) 202 { 203 MARK_INT_FAIL(CODA_MOUNT_STATS); 204 return(ENXIO); 205 } 206 207 if (minor(dev) >= NVCODA || minor(dev) < 0) { 208 MARK_INT_FAIL(CODA_MOUNT_STATS); 209 return(ENXIO); 210 } 211 212 /* 213 * Initialize the mount record and link it to the vfs struct 214 */ 215 mi = &coda_mnttbl[minor(dev)]; 216 217 if (!VC_OPEN(&mi->mi_vcomm)) { 218 MARK_INT_FAIL(CODA_MOUNT_STATS); 219 return(ENODEV); 220 } 221 222 /* No initialization (here) of mi_vcomm! */ 223 vfsp->mnt_data = mi; 224 vfsp->mnt_stat.f_fsid.val[0] = 0; 225 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 226 mi->mi_vfsp = vfsp; 227 228 /* 229 * Make a root vnode to placate the Vnode interface, but don't 230 * actually make the CODA_ROOT call to venus until the first call 231 * to coda_root in case a server is down while venus is starting. 232 */ 233 rootfid.Volume = 0; 234 rootfid.Vnode = 0; 235 rootfid.Unique = 0; 236 cp = make_coda_node(&rootfid, vfsp, VDIR); 237 rootvp = CTOV(cp); 238 rootvp->v_flag |= VROOT; 239 240 ctlfid.Volume = CTL_VOL; 241 ctlfid.Vnode = CTL_VNO; 242 ctlfid.Unique = CTL_UNI; 243 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 244 The above code seems to cause a loop in the cnode links. 245 I don't totally understand when it happens, it is caught 246 when closing down the system. 247 */ 248 cp = make_coda_node(&ctlfid, 0, VCHR); 249 250 coda_ctlvp = CTOV(cp); 251 252 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 253 mi->mi_vfsp = vfsp; 254 mi->mi_rootvp = rootvp; 255 256 /* set filesystem block size */ 257 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 258 259 /* error is currently guaranteed to be zero, but in case some 260 code changes... */ 261 CODADEBUG(1, 262 myprintf(("coda_mount returned %d\n",error));); 263 if (error) 264 MARK_INT_FAIL(CODA_MOUNT_STATS); 265 else 266 MARK_INT_SAT(CODA_MOUNT_STATS); 267 268 return(error); 269 } 270 271 int 272 coda_start(vfsp, flags, p) 273 struct mount *vfsp; 274 int flags; 275 struct proc *p; 276 { 277 ENTRY; 278 return (0); 279 } 280 281 int 282 coda_unmount(vfsp, mntflags, p) 283 struct mount *vfsp; 284 int mntflags; 285 struct proc *p; 286 { 287 struct coda_mntinfo *mi = vftomi(vfsp); 288 int active, error = 0; 289 290 ENTRY; 291 MARK_ENTRY(CODA_UMOUNT_STATS); 292 if (!CODA_MOUNTED(vfsp)) { 293 MARK_INT_FAIL(CODA_UMOUNT_STATS); 294 return(EINVAL); 295 } 296 297 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 298 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 299 return (EBUSY); /* Venus is still running */ 300 301 #ifdef DEBUG 302 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 303 #endif 304 vrele(mi->mi_rootvp); 305 306 active = coda_kill(vfsp, NOT_DOWNCALL); 307 mi->mi_rootvp->v_flag &= ~VROOT; 308 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 309 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 310 error = 0; 311 312 /* I'm going to take this out to allow lookups to go through. I'm 313 * not sure it's important anyway. -- DCS 2/2/94 314 */ 315 /* vfsp->VFS_DATA = NULL; */ 316 317 /* No more vfsp's to hold onto */ 318 mi->mi_vfsp = NULL; 319 mi->mi_rootvp = NULL; 320 321 if (error) 322 MARK_INT_FAIL(CODA_UMOUNT_STATS); 323 else 324 MARK_INT_SAT(CODA_UMOUNT_STATS); 325 326 return(error); 327 } 328 return (EINVAL); 329 } 330 331 /* 332 * find root of cfs 333 */ 334 int 335 coda_root(vfsp, vpp) 336 struct mount *vfsp; 337 struct vnode **vpp; 338 { 339 struct coda_mntinfo *mi = vftomi(vfsp); 340 struct vnode **result; 341 int error; 342 struct proc *p = curproc; /* XXX - bnoble */ 343 ViceFid VFid; 344 345 ENTRY; 346 MARK_ENTRY(CODA_ROOT_STATS); 347 result = NULL; 348 349 if (vfsp == mi->mi_vfsp) { 350 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 351 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 352 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 353 { /* Found valid root. */ 354 *vpp = mi->mi_rootvp; 355 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 356 vref(*vpp); 357 vn_lock(*vpp, LK_EXCLUSIVE); 358 MARK_INT_SAT(CODA_ROOT_STATS); 359 return(0); 360 } 361 } 362 363 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 364 365 if (!error) { 366 /* 367 * Save the new rootfid in the cnode, and rehash the cnode into the 368 * cnode hash with the new fid key. 369 */ 370 coda_unsave(VTOC(mi->mi_rootvp)); 371 VTOC(mi->mi_rootvp)->c_fid = VFid; 372 coda_save(VTOC(mi->mi_rootvp)); 373 374 *vpp = mi->mi_rootvp; 375 vref(*vpp); 376 vn_lock(*vpp, LK_EXCLUSIVE); 377 MARK_INT_SAT(CODA_ROOT_STATS); 378 goto exit; 379 } else if (error == ENODEV || error == EINTR) { 380 /* Gross hack here! */ 381 /* 382 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 383 * ENODEV. Return the uninitialized root vnode to allow vfs 384 * operations such as unmount to continue. Without this hack, 385 * there is no way to do an unmount if Venus dies before a 386 * successful CODA_ROOT call is done. All vnode operations 387 * will fail. 388 */ 389 *vpp = mi->mi_rootvp; 390 vref(*vpp); 391 vn_lock(*vpp, LK_EXCLUSIVE); 392 MARK_INT_FAIL(CODA_ROOT_STATS); 393 error = 0; 394 goto exit; 395 } else { 396 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 397 MARK_INT_FAIL(CODA_ROOT_STATS); 398 399 goto exit; 400 } 401 exit: 402 return(error); 403 } 404 405 int 406 coda_quotactl(vfsp, cmd, uid, arg, p) 407 struct mount *vfsp; 408 int cmd; 409 uid_t uid; 410 caddr_t arg; 411 struct proc *p; 412 { 413 ENTRY; 414 return (EOPNOTSUPP); 415 } 416 417 /* 418 * Get file system statistics. 419 */ 420 int 421 coda_nb_statfs(vfsp, sbp, p) 422 struct mount *vfsp; 423 struct statfs *sbp; 424 struct proc *p; 425 { 426 struct coda_statfs fsstat; 427 int error; 428 429 ENTRY; 430 MARK_ENTRY(CODA_STATFS_STATS); 431 if (!CODA_MOUNTED(vfsp)) { 432 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 433 return(EINVAL); 434 } 435 436 memset(sbp, 0, sizeof(struct statfs)); 437 /* XXX - what to do about f_flags, others? --bnoble */ 438 /* Below This is what AFS does 439 #define NB_SFS_SIZ 0x895440 440 */ 441 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 442 443 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 444 445 if (!error) { 446 sbp->f_type = 0; 447 sbp->f_bsize = 8192; /* XXX */ 448 sbp->f_iosize = 8192; /* XXX */ 449 sbp->f_blocks = fsstat.f_blocks; 450 sbp->f_bfree = fsstat.f_bfree; 451 sbp->f_bavail = fsstat.f_bavail; 452 sbp->f_files = fsstat.f_files; 453 sbp->f_ffree = fsstat.f_ffree; 454 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), 455 (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 456 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 457 strcpy(sbp->f_mntonname, "/coda"); 458 strcpy(sbp->f_mntfromname, "CODA"); 459 } 460 461 MARK_INT_SAT(CODA_STATFS_STATS); 462 return(error); 463 } 464 465 /* 466 * Flush any pending I/O. 467 */ 468 int 469 coda_sync(vfsp, waitfor, cred, p) 470 struct mount *vfsp; 471 int waitfor; 472 struct ucred *cred; 473 struct proc *p; 474 { 475 ENTRY; 476 MARK_ENTRY(CODA_SYNC_STATS); 477 MARK_INT_SAT(CODA_SYNC_STATS); 478 return(0); 479 } 480 481 int 482 coda_vget(vfsp, ino, vpp) 483 struct mount *vfsp; 484 ino_t ino; 485 struct vnode **vpp; 486 { 487 ENTRY; 488 return (EOPNOTSUPP); 489 } 490 491 /* 492 * fhtovp is now what vget used to be in 4.3-derived systems. For 493 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 494 * a type-specific fid. 495 */ 496 int 497 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 498 struct mount *vfsp; 499 struct fid *fhp; 500 struct mbuf *nam; 501 struct vnode **vpp; 502 int *exflagsp; 503 struct ucred **creadanonp; 504 { 505 struct cfid *cfid = (struct cfid *)fhp; 506 struct cnode *cp = 0; 507 int error; 508 struct proc *p = curproc; /* XXX -mach */ 509 ViceFid VFid; 510 int vtype; 511 512 ENTRY; 513 514 MARK_ENTRY(CODA_VGET_STATS); 515 /* Check for vget of control object. */ 516 if (IS_CTL_FID(&cfid->cfid_fid)) { 517 *vpp = coda_ctlvp; 518 vref(coda_ctlvp); 519 MARK_INT_SAT(CODA_VGET_STATS); 520 return(0); 521 } 522 523 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 524 525 if (error) { 526 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 527 *vpp = (struct vnode *)0; 528 } else { 529 CODADEBUG(CODA_VGET, 530 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 531 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 532 533 cp = make_coda_node(&VFid, vfsp, vtype); 534 *vpp = CTOV(cp); 535 } 536 return(error); 537 } 538 539 int 540 coda_vptofh(vnp, fidp) 541 struct vnode *vnp; 542 struct fid *fidp; 543 { 544 ENTRY; 545 return (EOPNOTSUPP); 546 } 547 548 void 549 coda_init(void) 550 { 551 ENTRY; 552 } 553 554 void 555 coda_done(void) 556 { 557 ENTRY; 558 } 559 560 int 561 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 562 int *name; 563 u_int namelen; 564 void *oldp; 565 size_t *oldlp; 566 void *newp; 567 size_t newl; 568 struct proc *p; 569 { 570 571 /* all sysctl names at this level are terminal */ 572 if (namelen != 1) 573 return (ENOTDIR); /* overloaded */ 574 575 switch (name[0]) { 576 /* 577 case FFS_CLUSTERREAD: 578 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 579 */ 580 default: 581 return (EOPNOTSUPP); 582 } 583 /* NOTREACHED */ 584 } 585 586 /* 587 * To allow for greater ease of use, some vnodes may be orphaned when 588 * Venus dies. Certain operations should still be allowed to go 589 * through, but without propagating ophan-ness. So this function will 590 * get a new vnode for the file from the current run of Venus. */ 591 592 int 593 getNewVnode(vpp) 594 struct vnode **vpp; 595 { 596 struct cfid cfid; 597 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 598 599 ENTRY; 600 601 cfid.cfid_len = (short)sizeof(ViceFid); 602 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 603 /* XXX ? */ 604 605 /* We're guessing that if set, the 1st element on the list is a 606 * valid vnode to use. If not, return ENODEV as venus is dead. 607 */ 608 if (mi->mi_vfsp == NULL) 609 return ENODEV; 610 611 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 612 NULL, NULL); 613 } 614 615 #include <ufs/ufs/quota.h> 616 #include <ufs/ufs/ufsmount.h> 617 /* get the mount structure corresponding to a given device. Assume 618 * device corresponds to a UFS. Return NULL if no device is found. 619 */ 620 struct mount *devtomp(dev) 621 dev_t dev; 622 { 623 struct mount *mp, *nmp; 624 625 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 626 nmp = mp->mnt_list.cqe_next; 627 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 628 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 629 /* mount corresponds to UFS and the device matches one we want */ 630 return(mp); 631 } 632 } 633 /* mount structure wasn't found */ 634 return(NULL); 635 } 636
Indexes created Thu Oct 02 01:09:59 GMT 2025