coda_vfsops.c revision 1.21
1 /* $NetBSD: coda_vfsops.c,v 1.21 2003/02/01 06:23:36 thorpej 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 1.21 2003/02/01 06:23:36 thorpej 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 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 75 76 int codadebug = 0; 77 78 int coda_vfsop_print_entry = 0; 79 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 80 81 struct vnode *coda_ctlvp; 82 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 83 84 /* structure to keep statistics of internally generated/satisfied calls */ 85 86 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 87 88 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 89 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 90 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 91 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 92 93 extern const struct cdevsw vcoda_cdevsw; 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 const struct cdevsw *cdev; 160 ViceFid rootfid; 161 ViceFid ctlfid; 162 int error; 163 164 if (vfsp->mnt_flag & MNT_GETARGS) 165 return 0; 166 ENTRY; 167 168 coda_vfsopstats_init(); 169 coda_vnodeopstats_init(); 170 171 MARK_ENTRY(CODA_MOUNT_STATS); 172 if (CODA_MOUNTED(vfsp)) { 173 MARK_INT_FAIL(CODA_MOUNT_STATS); 174 return(EBUSY); 175 } 176 177 /* Validate mount device. Similar to getmdev(). */ 178 179 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 180 error = namei(ndp); 181 dvp = ndp->ni_vp; 182 183 if (error) { 184 MARK_INT_FAIL(CODA_MOUNT_STATS); 185 return (error); 186 } 187 if (dvp->v_type != VCHR) { 188 MARK_INT_FAIL(CODA_MOUNT_STATS); 189 vrele(dvp); 190 return(ENXIO); 191 } 192 dev = dvp->v_specinfo->si_rdev; 193 vrele(dvp); 194 cdev = cdevsw_lookup(dev); 195 if (cdev == NULL) { 196 MARK_INT_FAIL(CODA_MOUNT_STATS); 197 return(ENXIO); 198 } 199 200 /* 201 * See if the device table matches our expectations. 202 */ 203 if (cdev != &vcoda_cdevsw) 204 { 205 MARK_INT_FAIL(CODA_MOUNT_STATS); 206 return(ENXIO); 207 } 208 209 if (minor(dev) >= NVCODA || minor(dev) < 0) { 210 MARK_INT_FAIL(CODA_MOUNT_STATS); 211 return(ENXIO); 212 } 213 214 /* 215 * Initialize the mount record and link it to the vfs struct 216 */ 217 mi = &coda_mnttbl[minor(dev)]; 218 219 if (!VC_OPEN(&mi->mi_vcomm)) { 220 MARK_INT_FAIL(CODA_MOUNT_STATS); 221 return(ENODEV); 222 } 223 224 /* No initialization (here) of mi_vcomm! */ 225 vfsp->mnt_data = mi; 226 vfsp->mnt_stat.f_fsid.val[0] = 0; 227 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 228 mi->mi_vfsp = vfsp; 229 230 /* 231 * Make a root vnode to placate the Vnode interface, but don't 232 * actually make the CODA_ROOT call to venus until the first call 233 * to coda_root in case a server is down while venus is starting. 234 */ 235 rootfid.Volume = 0; 236 rootfid.Vnode = 0; 237 rootfid.Unique = 0; 238 cp = make_coda_node(&rootfid, vfsp, VDIR); 239 rootvp = CTOV(cp); 240 rootvp->v_flag |= VROOT; 241 242 ctlfid.Volume = CTL_VOL; 243 ctlfid.Vnode = CTL_VNO; 244 ctlfid.Unique = CTL_UNI; 245 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 246 The above code seems to cause a loop in the cnode links. 247 I don't totally understand when it happens, it is caught 248 when closing down the system. 249 */ 250 cp = make_coda_node(&ctlfid, 0, VCHR); 251 252 coda_ctlvp = CTOV(cp); 253 254 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 255 mi->mi_vfsp = vfsp; 256 mi->mi_rootvp = rootvp; 257 258 /* set filesystem block size */ 259 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 260 261 /* error is currently guaranteed to be zero, but in case some 262 code changes... */ 263 CODADEBUG(1, 264 myprintf(("coda_mount returned %d\n",error));); 265 if (error) 266 MARK_INT_FAIL(CODA_MOUNT_STATS); 267 else 268 MARK_INT_SAT(CODA_MOUNT_STATS); 269 270 return(error); 271 } 272 273 int 274 coda_start(vfsp, flags, p) 275 struct mount *vfsp; 276 int flags; 277 struct proc *p; 278 { 279 ENTRY; 280 return (0); 281 } 282 283 int 284 coda_unmount(vfsp, mntflags, p) 285 struct mount *vfsp; 286 int mntflags; 287 struct proc *p; 288 { 289 struct coda_mntinfo *mi = vftomi(vfsp); 290 int active, error = 0; 291 292 ENTRY; 293 MARK_ENTRY(CODA_UMOUNT_STATS); 294 if (!CODA_MOUNTED(vfsp)) { 295 MARK_INT_FAIL(CODA_UMOUNT_STATS); 296 return(EINVAL); 297 } 298 299 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 300 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 301 return (EBUSY); /* Venus is still running */ 302 303 #ifdef DEBUG 304 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 305 #endif 306 vrele(mi->mi_rootvp); 307 308 active = coda_kill(vfsp, NOT_DOWNCALL); 309 mi->mi_rootvp->v_flag &= ~VROOT; 310 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 311 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 312 error = 0; 313 314 /* I'm going to take this out to allow lookups to go through. I'm 315 * not sure it's important anyway. -- DCS 2/2/94 316 */ 317 /* vfsp->VFS_DATA = NULL; */ 318 319 /* No more vfsp's to hold onto */ 320 mi->mi_vfsp = NULL; 321 mi->mi_rootvp = NULL; 322 323 if (error) 324 MARK_INT_FAIL(CODA_UMOUNT_STATS); 325 else 326 MARK_INT_SAT(CODA_UMOUNT_STATS); 327 328 return(error); 329 } 330 return (EINVAL); 331 } 332 333 /* 334 * find root of cfs 335 */ 336 int 337 coda_root(vfsp, vpp) 338 struct mount *vfsp; 339 struct vnode **vpp; 340 { 341 struct coda_mntinfo *mi = vftomi(vfsp); 342 struct vnode **result; 343 int error; 344 struct proc *p = curproc; /* XXX - bnoble */ 345 ViceFid VFid; 346 347 ENTRY; 348 MARK_ENTRY(CODA_ROOT_STATS); 349 result = NULL; 350 351 if (vfsp == mi->mi_vfsp) { 352 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || 353 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || 354 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) 355 { /* Found valid root. */ 356 *vpp = mi->mi_rootvp; 357 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 358 vref(*vpp); 359 vn_lock(*vpp, LK_EXCLUSIVE); 360 MARK_INT_SAT(CODA_ROOT_STATS); 361 return(0); 362 } 363 } 364 365 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 366 367 if (!error) { 368 /* 369 * Save the new rootfid in the cnode, and rehash the cnode into the 370 * cnode hash with the new fid key. 371 */ 372 coda_unsave(VTOC(mi->mi_rootvp)); 373 VTOC(mi->mi_rootvp)->c_fid = VFid; 374 coda_save(VTOC(mi->mi_rootvp)); 375 376 *vpp = mi->mi_rootvp; 377 vref(*vpp); 378 vn_lock(*vpp, LK_EXCLUSIVE); 379 MARK_INT_SAT(CODA_ROOT_STATS); 380 goto exit; 381 } else if (error == ENODEV || error == EINTR) { 382 /* Gross hack here! */ 383 /* 384 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 385 * ENODEV. Return the uninitialized root vnode to allow vfs 386 * operations such as unmount to continue. Without this hack, 387 * there is no way to do an unmount if Venus dies before a 388 * successful CODA_ROOT call is done. All vnode operations 389 * will fail. 390 */ 391 *vpp = mi->mi_rootvp; 392 vref(*vpp); 393 vn_lock(*vpp, LK_EXCLUSIVE); 394 MARK_INT_FAIL(CODA_ROOT_STATS); 395 error = 0; 396 goto exit; 397 } else { 398 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 399 MARK_INT_FAIL(CODA_ROOT_STATS); 400 401 goto exit; 402 } 403 exit: 404 return(error); 405 } 406 407 int 408 coda_quotactl(vfsp, cmd, uid, arg, p) 409 struct mount *vfsp; 410 int cmd; 411 uid_t uid; 412 caddr_t arg; 413 struct proc *p; 414 { 415 ENTRY; 416 return (EOPNOTSUPP); 417 } 418 419 /* 420 * Get file system statistics. 421 */ 422 int 423 coda_nb_statfs(vfsp, sbp, p) 424 struct mount *vfsp; 425 struct statfs *sbp; 426 struct proc *p; 427 { 428 struct coda_statfs fsstat; 429 int error; 430 431 ENTRY; 432 MARK_ENTRY(CODA_STATFS_STATS); 433 if (!CODA_MOUNTED(vfsp)) { 434 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 435 return(EINVAL); 436 } 437 438 memset(sbp, 0, sizeof(struct statfs)); 439 /* XXX - what to do about f_flags, others? --bnoble */ 440 /* Below This is what AFS does 441 #define NB_SFS_SIZ 0x895440 442 */ 443 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 444 445 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 446 447 if (!error) { 448 sbp->f_type = 0; 449 sbp->f_bsize = 8192; /* XXX */ 450 sbp->f_iosize = 8192; /* XXX */ 451 sbp->f_blocks = fsstat.f_blocks; 452 sbp->f_bfree = fsstat.f_bfree; 453 sbp->f_bavail = fsstat.f_bavail; 454 sbp->f_files = fsstat.f_files; 455 sbp->f_ffree = fsstat.f_ffree; 456 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), 457 (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); 458 strncpy(sbp->f_fstypename, MOUNT_CODA, MFSNAMELEN-1); 459 strcpy(sbp->f_mntonname, "/coda"); 460 strcpy(sbp->f_mntfromname, "CODA"); 461 } 462 463 MARK_INT_SAT(CODA_STATFS_STATS); 464 return(error); 465 } 466 467 /* 468 * Flush any pending I/O. 469 */ 470 int 471 coda_sync(vfsp, waitfor, cred, p) 472 struct mount *vfsp; 473 int waitfor; 474 struct ucred *cred; 475 struct proc *p; 476 { 477 ENTRY; 478 MARK_ENTRY(CODA_SYNC_STATS); 479 MARK_INT_SAT(CODA_SYNC_STATS); 480 return(0); 481 } 482 483 int 484 coda_vget(vfsp, ino, vpp) 485 struct mount *vfsp; 486 ino_t ino; 487 struct vnode **vpp; 488 { 489 ENTRY; 490 return (EOPNOTSUPP); 491 } 492 493 /* 494 * fhtovp is now what vget used to be in 4.3-derived systems. For 495 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 496 * a type-specific fid. 497 */ 498 int 499 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 500 struct mount *vfsp; 501 struct fid *fhp; 502 struct mbuf *nam; 503 struct vnode **vpp; 504 int *exflagsp; 505 struct ucred **creadanonp; 506 { 507 struct cfid *cfid = (struct cfid *)fhp; 508 struct cnode *cp = 0; 509 int error; 510 struct proc *p = curproc; /* XXX -mach */ 511 ViceFid VFid; 512 int vtype; 513 514 ENTRY; 515 516 MARK_ENTRY(CODA_VGET_STATS); 517 /* Check for vget of control object. */ 518 if (IS_CTL_FID(&cfid->cfid_fid)) { 519 *vpp = coda_ctlvp; 520 vref(coda_ctlvp); 521 MARK_INT_SAT(CODA_VGET_STATS); 522 return(0); 523 } 524 525 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 526 527 if (error) { 528 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 529 *vpp = (struct vnode *)0; 530 } else { 531 CODADEBUG(CODA_VGET, 532 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n", 533 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) 534 535 cp = make_coda_node(&VFid, vfsp, vtype); 536 *vpp = CTOV(cp); 537 } 538 return(error); 539 } 540 541 int 542 coda_vptofh(vnp, fidp) 543 struct vnode *vnp; 544 struct fid *fidp; 545 { 546 ENTRY; 547 return (EOPNOTSUPP); 548 } 549 550 void 551 coda_init(void) 552 { 553 ENTRY; 554 } 555 556 void 557 coda_done(void) 558 { 559 ENTRY; 560 } 561 562 int 563 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 564 int *name; 565 u_int namelen; 566 void *oldp; 567 size_t *oldlp; 568 void *newp; 569 size_t newl; 570 struct proc *p; 571 { 572 573 /* all sysctl names at this level are terminal */ 574 if (namelen != 1) 575 return (ENOTDIR); /* overloaded */ 576 577 switch (name[0]) { 578 /* 579 case FFS_CLUSTERREAD: 580 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 581 */ 582 default: 583 return (EOPNOTSUPP); 584 } 585 /* NOTREACHED */ 586 } 587 588 /* 589 * To allow for greater ease of use, some vnodes may be orphaned when 590 * Venus dies. Certain operations should still be allowed to go 591 * through, but without propagating ophan-ness. So this function will 592 * get a new vnode for the file from the current run of Venus. */ 593 594 int 595 getNewVnode(vpp) 596 struct vnode **vpp; 597 { 598 struct cfid cfid; 599 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 600 601 ENTRY; 602 603 cfid.cfid_len = (short)sizeof(ViceFid); 604 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 605 /* XXX ? */ 606 607 /* We're guessing that if set, the 1st element on the list is a 608 * valid vnode to use. If not, return ENODEV as venus is dead. 609 */ 610 if (mi->mi_vfsp == NULL) 611 return ENODEV; 612 613 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 614 NULL, NULL); 615 } 616 617 #include <ufs/ufs/quota.h> 618 #include <ufs/ufs/ufsmount.h> 619 /* get the mount structure corresponding to a given device. Assume 620 * device corresponds to a UFS. Return NULL if no device is found. 621 */ 622 struct mount *devtomp(dev) 623 dev_t dev; 624 { 625 struct mount *mp, *nmp; 626 627 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 628 nmp = mp->mnt_list.cqe_next; 629 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 630 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 631 /* mount corresponds to UFS and the device matches one we want */ 632 return(mp); 633 } 634 } 635 /* mount structure wasn't found */ 636 return(NULL); 637 } 638
Indexes created Wed Sep 24 05:09:52 GMT 2025