coda_vfsops.c revision 1.29
1 /* $NetBSD: coda_vfsops.c,v 1.29 2003/08/27 17:49:49 drochner 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 1.29 2003/08/27 17:49:49 drochner 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 }; 124 125 126 int 127 coda_vfsopstats_init(void) 128 { 129 int i; 130 131 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 132 coda_vfsopstats[i].opcode = i; 133 coda_vfsopstats[i].entries = 0; 134 coda_vfsopstats[i].sat_intrn = 0; 135 coda_vfsopstats[i].unsat_intrn = 0; 136 coda_vfsopstats[i].gen_intrn = 0; 137 } 138 139 return 0; 140 } 141 142 /* 143 * cfs mount vfsop 144 * Set up mount info record and attach it to vfs struct. 145 */ 146 /*ARGSUSED*/ 147 int 148 coda_mount(vfsp, path, data, ndp, p) 149 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 150 const char *path; /* path covered: ignored by the fs-layer */ 151 void *data; /* Need to define a data type for this in netbsd? */ 152 struct nameidata *ndp; /* Clobber this to lookup the device name */ 153 struct proc *p; /* The ever-famous proc pointer */ 154 { 155 struct vnode *dvp; 156 struct cnode *cp; 157 dev_t dev; 158 struct coda_mntinfo *mi; 159 struct vnode *rootvp; 160 const struct cdevsw *cdev; 161 CodaFid rootfid = INVAL_FID; 162 CodaFid ctlfid = CTL_FID; 163 int error; 164 165 if (vfsp->mnt_flag & MNT_GETARGS) 166 return 0; 167 ENTRY; 168 169 coda_vfsopstats_init(); 170 coda_vnodeopstats_init(); 171 172 MARK_ENTRY(CODA_MOUNT_STATS); 173 if (CODA_MOUNTED(vfsp)) { 174 MARK_INT_FAIL(CODA_MOUNT_STATS); 175 return(EBUSY); 176 } 177 178 /* Validate mount device. Similar to getmdev(). */ 179 180 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 181 error = namei(ndp); 182 dvp = ndp->ni_vp; 183 184 if (error) { 185 MARK_INT_FAIL(CODA_MOUNT_STATS); 186 return (error); 187 } 188 if (dvp->v_type != VCHR) { 189 MARK_INT_FAIL(CODA_MOUNT_STATS); 190 vrele(dvp); 191 return(ENXIO); 192 } 193 dev = dvp->v_specinfo->si_rdev; 194 vrele(dvp); 195 cdev = cdevsw_lookup(dev); 196 if (cdev == NULL) { 197 MARK_INT_FAIL(CODA_MOUNT_STATS); 198 return(ENXIO); 199 } 200 201 /* 202 * See if the device table matches our expectations. 203 */ 204 if (cdev != &vcoda_cdevsw) 205 { 206 MARK_INT_FAIL(CODA_MOUNT_STATS); 207 return(ENXIO); 208 } 209 210 if (minor(dev) >= NVCODA || minor(dev) < 0) { 211 MARK_INT_FAIL(CODA_MOUNT_STATS); 212 return(ENXIO); 213 } 214 215 /* 216 * Initialize the mount record and link it to the vfs struct 217 */ 218 mi = &coda_mnttbl[minor(dev)]; 219 220 if (!VC_OPEN(&mi->mi_vcomm)) { 221 MARK_INT_FAIL(CODA_MOUNT_STATS); 222 return(ENODEV); 223 } 224 225 /* No initialization (here) of mi_vcomm! */ 226 vfsp->mnt_data = mi; 227 vfsp->mnt_stat.f_fsid.val[0] = 0; 228 vfsp->mnt_stat.f_fsid.val[1] = makefstype(MOUNT_CODA); 229 mi->mi_vfsp = vfsp; 230 231 /* 232 * Make a root vnode to placate the Vnode interface, but don't 233 * actually make the CODA_ROOT call to venus until the first call 234 * to coda_root in case a server is down while venus is starting. 235 */ 236 cp = make_coda_node(&rootfid, vfsp, VDIR); 237 rootvp = CTOV(cp); 238 rootvp->v_flag |= VROOT; 239 240 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 241 The above code seems to cause a loop in the cnode links. 242 I don't totally understand when it happens, it is caught 243 when closing down the system. 244 */ 245 cp = make_coda_node(&ctlfid, 0, VCHR); 246 247 coda_ctlvp = CTOV(cp); 248 249 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 250 mi->mi_vfsp = vfsp; 251 mi->mi_rootvp = rootvp; 252 253 /* set filesystem block size */ 254 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 255 256 /* error is currently guaranteed to be zero, but in case some 257 code changes... */ 258 CODADEBUG(1, 259 myprintf(("coda_mount returned %d\n",error));); 260 if (error) 261 MARK_INT_FAIL(CODA_MOUNT_STATS); 262 else 263 MARK_INT_SAT(CODA_MOUNT_STATS); 264 265 return set_statfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 266 p); 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 vftomi(vfsp)->mi_started = 1; 277 return (0); 278 } 279 280 int 281 coda_unmount(vfsp, mntflags, p) 282 struct mount *vfsp; 283 int mntflags; 284 struct proc *p; 285 { 286 struct coda_mntinfo *mi = vftomi(vfsp); 287 int active, error = 0; 288 289 ENTRY; 290 MARK_ENTRY(CODA_UMOUNT_STATS); 291 if (!CODA_MOUNTED(vfsp)) { 292 MARK_INT_FAIL(CODA_UMOUNT_STATS); 293 return(EINVAL); 294 } 295 296 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 297 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 298 return (EBUSY); /* Venus is still running */ 299 300 #ifdef DEBUG 301 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 302 #endif 303 mi->mi_started = 0; 304 305 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 CodaFid VFid; 345 static const CodaFid invalfid = INVAL_FID; 346 347 ENTRY; 348 MARK_ENTRY(CODA_ROOT_STATS); 349 result = NULL; 350 351 if (vfsp == mi->mi_vfsp) { 352 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 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 /* XXX - what to do about f_flags, others? --bnoble */ 437 /* Below This is what AFS does 438 #define NB_SFS_SIZ 0x895440 439 */ 440 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 441 442 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 443 444 if (!error) { 445 sbp->f_type = 0; 446 sbp->f_bsize = 8192; /* XXX */ 447 sbp->f_iosize = 8192; /* XXX */ 448 sbp->f_blocks = fsstat.f_blocks; 449 sbp->f_bfree = fsstat.f_bfree; 450 sbp->f_bavail = fsstat.f_bavail; 451 sbp->f_files = fsstat.f_files; 452 sbp->f_ffree = fsstat.f_ffree; 453 copy_statfs_info(sbp, vfsp); 454 } 455 456 MARK_INT_SAT(CODA_STATFS_STATS); 457 return(error); 458 } 459 460 /* 461 * Flush any pending I/O. 462 */ 463 int 464 coda_sync(vfsp, waitfor, cred, p) 465 struct mount *vfsp; 466 int waitfor; 467 struct ucred *cred; 468 struct proc *p; 469 { 470 ENTRY; 471 MARK_ENTRY(CODA_SYNC_STATS); 472 MARK_INT_SAT(CODA_SYNC_STATS); 473 return(0); 474 } 475 476 int 477 coda_vget(vfsp, ino, vpp) 478 struct mount *vfsp; 479 ino_t ino; 480 struct vnode **vpp; 481 { 482 ENTRY; 483 return (EOPNOTSUPP); 484 } 485 486 /* 487 * fhtovp is now what vget used to be in 4.3-derived systems. For 488 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 489 * a type-specific fid. 490 */ 491 int 492 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 493 struct mount *vfsp; 494 struct fid *fhp; 495 struct mbuf *nam; 496 struct vnode **vpp; 497 int *exflagsp; 498 struct ucred **creadanonp; 499 { 500 struct cfid *cfid = (struct cfid *)fhp; 501 struct cnode *cp = 0; 502 int error; 503 struct proc *p = curproc; /* XXX -mach */ 504 CodaFid VFid; 505 int vtype; 506 507 ENTRY; 508 509 MARK_ENTRY(CODA_VGET_STATS); 510 /* Check for vget of control object. */ 511 if (IS_CTL_FID(&cfid->cfid_fid)) { 512 *vpp = coda_ctlvp; 513 vref(coda_ctlvp); 514 MARK_INT_SAT(CODA_VGET_STATS); 515 return(0); 516 } 517 518 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 519 520 if (error) { 521 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 522 *vpp = (struct vnode *)0; 523 } else { 524 CODADEBUG(CODA_VGET, 525 myprintf(("vget: %s type %d result %d\n", 526 coda_f2s(&VFid), vtype, error)); ) 527 528 cp = make_coda_node(&VFid, vfsp, vtype); 529 *vpp = CTOV(cp); 530 } 531 return(error); 532 } 533 534 int 535 coda_vptofh(vnp, fidp) 536 struct vnode *vnp; 537 struct fid *fidp; 538 { 539 ENTRY; 540 return (EOPNOTSUPP); 541 } 542 543 void 544 coda_init(void) 545 { 546 ENTRY; 547 } 548 549 void 550 coda_done(void) 551 { 552 ENTRY; 553 } 554 555 int 556 coda_sysctl(name, namelen, oldp, oldlp, newp, newl, p) 557 int *name; 558 u_int namelen; 559 void *oldp; 560 size_t *oldlp; 561 void *newp; 562 size_t newl; 563 struct proc *p; 564 { 565 566 /* all sysctl names at this level are terminal */ 567 if (namelen != 1) 568 return (ENOTDIR); /* overloaded */ 569 570 switch (name[0]) { 571 /* 572 case FFS_CLUSTERREAD: 573 return (sysctl_int(oldp, oldlp, newp, newl, &doclusterread)); 574 */ 575 default: 576 return (EOPNOTSUPP); 577 } 578 /* NOTREACHED */ 579 } 580 581 /* 582 * To allow for greater ease of use, some vnodes may be orphaned when 583 * Venus dies. Certain operations should still be allowed to go 584 * through, but without propagating ophan-ness. So this function will 585 * get a new vnode for the file from the current run of Venus. */ 586 587 int 588 getNewVnode(vpp) 589 struct vnode **vpp; 590 { 591 struct cfid cfid; 592 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 593 594 ENTRY; 595 596 cfid.cfid_len = (short)sizeof(CodaFid); 597 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 598 /* XXX ? */ 599 600 /* We're guessing that if set, the 1st element on the list is a 601 * valid vnode to use. If not, return ENODEV as venus is dead. 602 */ 603 if (mi->mi_vfsp == NULL) 604 return ENODEV; 605 606 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 607 NULL, NULL); 608 } 609 610 #include <ufs/ufs/quota.h> 611 #include <ufs/ufs/ufsmount.h> 612 /* get the mount structure corresponding to a given device. Assume 613 * device corresponds to a UFS. Return NULL if no device is found. 614 */ 615 struct mount *devtomp(dev) 616 dev_t dev; 617 { 618 struct mount *mp, *nmp; 619 620 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 621 nmp = mp->mnt_list.cqe_next; 622 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 623 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 624 /* mount corresponds to UFS and the device matches one we want */ 625 return(mp); 626 } 627 } 628 /* mount structure wasn't found */ 629 return(NULL); 630 } 631
Indexes created Thu Sep 25 16:09:42 GMT 2025