coda_vfsops.c revision 1.26.2.3
1 /* $NetBSD: coda_vfsops.c,v 1.26.2.3 2004/08/03 10:43:19 skrll 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 1.26.2.3 2004/08/03 10:43:19 skrll 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/sysctl.h> 59 #include <sys/malloc.h> 60 #include <sys/conf.h> 61 #include <sys/namei.h> 62 #include <sys/dirent.h> 63 #include <sys/mount.h> 64 #include <sys/proc.h> 65 #include <sys/select.h> 66 67 #include <coda/coda.h> 68 #include <coda/cnode.h> 69 #include <coda/coda_vfsops.h> 70 #include <coda/coda_venus.h> 71 #include <coda/coda_subr.h> 72 #include <coda/coda_opstats.h> 73 /* for VN_RDEV */ 74 #include <miscfs/specfs/specdev.h> 75 76 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 77 78 int codadebug = 0; 79 80 int coda_vfsop_print_entry = 0; 81 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 82 83 struct vnode *coda_ctlvp; 84 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 85 86 /* structure to keep statistics of internally generated/satisfied calls */ 87 88 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 89 90 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 91 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 92 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 93 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 94 95 extern const struct cdevsw vcoda_cdevsw; 96 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 97 98 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 99 &coda_vnodeop_opv_desc, 100 NULL, 101 }; 102 103 struct vfsops coda_vfsops = { 104 MOUNT_CODA, 105 coda_mount, 106 coda_start, 107 coda_unmount, 108 coda_root, 109 coda_quotactl, 110 coda_nb_statvfs, 111 coda_sync, 112 coda_vget, 113 (int (*) (struct mount *, struct fid *, struct vnode **, struct lwp *)) 114 eopnotsupp, 115 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 116 coda_init, 117 NULL, 118 coda_done, 119 NULL, 120 (int (*)(void)) eopnotsupp, 121 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 122 eopnotsupp, 123 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 124 coda_vnodeopv_descs, 125 0 126 }; 127 128 129 int 130 coda_vfsopstats_init(void) 131 { 132 int i; 133 134 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 135 coda_vfsopstats[i].opcode = i; 136 coda_vfsopstats[i].entries = 0; 137 coda_vfsopstats[i].sat_intrn = 0; 138 coda_vfsopstats[i].unsat_intrn = 0; 139 coda_vfsopstats[i].gen_intrn = 0; 140 } 141 142 return 0; 143 } 144 145 /* 146 * cfs mount vfsop 147 * Set up mount info record and attach it to vfs struct. 148 */ 149 /*ARGSUSED*/ 150 int 151 coda_mount(vfsp, path, data, ndp, l) 152 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 153 const char *path; /* path covered: ignored by the fs-layer */ 154 void *data; /* Need to define a data type for this in netbsd? */ 155 struct nameidata *ndp; /* Clobber this to lookup the device name */ 156 struct lwp *l; /* The ever-famous lwp pointer */ 157 { 158 struct vnode *dvp; 159 struct cnode *cp; 160 dev_t dev; 161 struct coda_mntinfo *mi; 162 struct vnode *rootvp; 163 const struct cdevsw *cdev; 164 CodaFid rootfid = INVAL_FID; 165 CodaFid ctlfid = CTL_FID; 166 int error; 167 168 if (vfsp->mnt_flag & MNT_GETARGS) 169 return 0; 170 ENTRY; 171 172 coda_vfsopstats_init(); 173 coda_vnodeopstats_init(); 174 175 MARK_ENTRY(CODA_MOUNT_STATS); 176 if (CODA_MOUNTED(vfsp)) { 177 MARK_INT_FAIL(CODA_MOUNT_STATS); 178 return(EBUSY); 179 } 180 181 /* Validate mount device. Similar to getmdev(). */ 182 183 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, l); 184 error = namei(ndp); 185 dvp = ndp->ni_vp; 186 187 if (error) { 188 MARK_INT_FAIL(CODA_MOUNT_STATS); 189 return (error); 190 } 191 if (dvp->v_type != VCHR) { 192 MARK_INT_FAIL(CODA_MOUNT_STATS); 193 vrele(dvp); 194 return(ENXIO); 195 } 196 dev = dvp->v_specinfo->si_rdev; 197 vrele(dvp); 198 cdev = cdevsw_lookup(dev); 199 if (cdev == NULL) { 200 MARK_INT_FAIL(CODA_MOUNT_STATS); 201 return(ENXIO); 202 } 203 204 /* 205 * See if the device table matches our expectations. 206 */ 207 if (cdev != &vcoda_cdevsw) 208 { 209 MARK_INT_FAIL(CODA_MOUNT_STATS); 210 return(ENXIO); 211 } 212 213 if (minor(dev) >= NVCODA || minor(dev) < 0) { 214 MARK_INT_FAIL(CODA_MOUNT_STATS); 215 return(ENXIO); 216 } 217 218 /* 219 * Initialize the mount record and link it to the vfs struct 220 */ 221 mi = &coda_mnttbl[minor(dev)]; 222 223 if (!VC_OPEN(&mi->mi_vcomm)) { 224 MARK_INT_FAIL(CODA_MOUNT_STATS); 225 return(ENODEV); 226 } 227 228 /* No initialization (here) of mi_vcomm! */ 229 vfsp->mnt_data = mi; 230 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 231 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 232 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 233 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 234 mi->mi_vfsp = vfsp; 235 236 /* 237 * Make a root vnode to placate the Vnode interface, but don't 238 * actually make the CODA_ROOT call to venus until the first call 239 * to coda_root in case a server is down while venus is starting. 240 */ 241 cp = make_coda_node(&rootfid, vfsp, VDIR); 242 rootvp = CTOV(cp); 243 rootvp->v_flag |= VROOT; 244 245 /* 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 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 261 262 /* error is currently guaranteed to be zero, but in case some 263 code changes... */ 264 CODADEBUG(1, 265 myprintf(("coda_mount returned %d\n",error));); 266 if (error) 267 MARK_INT_FAIL(CODA_MOUNT_STATS); 268 else 269 MARK_INT_SAT(CODA_MOUNT_STATS); 270 271 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 272 l); 273 } 274 275 int 276 coda_start(vfsp, flags, l) 277 struct mount *vfsp; 278 int flags; 279 struct lwp *l; 280 { 281 ENTRY; 282 vftomi(vfsp)->mi_started = 1; 283 return (0); 284 } 285 286 int 287 coda_unmount(vfsp, mntflags, l) 288 struct mount *vfsp; 289 int mntflags; 290 struct lwp *l; 291 { 292 struct coda_mntinfo *mi = vftomi(vfsp); 293 int active, error = 0; 294 295 ENTRY; 296 MARK_ENTRY(CODA_UMOUNT_STATS); 297 if (!CODA_MOUNTED(vfsp)) { 298 MARK_INT_FAIL(CODA_UMOUNT_STATS); 299 return(EINVAL); 300 } 301 302 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 303 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 304 return (EBUSY); /* Venus is still running */ 305 306 #ifdef DEBUG 307 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 308 #endif 309 mi->mi_started = 0; 310 311 vrele(mi->mi_rootvp); 312 313 active = coda_kill(vfsp, NOT_DOWNCALL); 314 mi->mi_rootvp->v_flag &= ~VROOT; 315 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 316 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 317 error = 0; 318 319 /* I'm going to take this out to allow lookups to go through. I'm 320 * not sure it's important anyway. -- DCS 2/2/94 321 */ 322 /* vfsp->VFS_DATA = NULL; */ 323 324 /* No more vfsp's to hold onto */ 325 mi->mi_vfsp = NULL; 326 mi->mi_rootvp = NULL; 327 328 if (error) 329 MARK_INT_FAIL(CODA_UMOUNT_STATS); 330 else 331 MARK_INT_SAT(CODA_UMOUNT_STATS); 332 333 return(error); 334 } 335 return (EINVAL); 336 } 337 338 /* 339 * find root of cfs 340 */ 341 int 342 coda_root(vfsp, vpp, l) 343 struct mount *vfsp; 344 struct vnode **vpp; 345 struct lwp *l; 346 { 347 struct coda_mntinfo *mi = vftomi(vfsp); 348 int error; 349 struct proc *p; 350 CodaFid VFid; 351 static const CodaFid invalfid = INVAL_FID; 352 353 p = l->l_proc; 354 ENTRY; 355 MARK_ENTRY(CODA_ROOT_STATS); 356 357 if (vfsp == mi->mi_vfsp) { 358 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 359 { /* Found valid root. */ 360 *vpp = mi->mi_rootvp; 361 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 362 vref(*vpp); 363 vn_lock(*vpp, LK_EXCLUSIVE); 364 MARK_INT_SAT(CODA_ROOT_STATS); 365 return(0); 366 } 367 } 368 369 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, l, &VFid); 370 371 if (!error) { 372 /* 373 * Save the new rootfid in the cnode, and rehash the cnode into the 374 * cnode hash with the new fid key. 375 */ 376 coda_unsave(VTOC(mi->mi_rootvp)); 377 VTOC(mi->mi_rootvp)->c_fid = VFid; 378 coda_save(VTOC(mi->mi_rootvp)); 379 380 *vpp = mi->mi_rootvp; 381 vref(*vpp); 382 vn_lock(*vpp, LK_EXCLUSIVE); 383 MARK_INT_SAT(CODA_ROOT_STATS); 384 goto exit; 385 } else if (error == ENODEV || error == EINTR) { 386 /* Gross hack here! */ 387 /* 388 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 389 * ENODEV. Return the uninitialized root vnode to allow vfs 390 * operations such as unmount to continue. Without this hack, 391 * there is no way to do an unmount if Venus dies before a 392 * successful CODA_ROOT call is done. All vnode operations 393 * will fail. 394 */ 395 *vpp = mi->mi_rootvp; 396 vref(*vpp); 397 vn_lock(*vpp, LK_EXCLUSIVE); 398 MARK_INT_FAIL(CODA_ROOT_STATS); 399 error = 0; 400 goto exit; 401 } else { 402 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 403 MARK_INT_FAIL(CODA_ROOT_STATS); 404 405 goto exit; 406 } 407 exit: 408 return(error); 409 } 410 411 int 412 coda_quotactl(vfsp, cmd, uid, arg, l) 413 struct mount *vfsp; 414 int cmd; 415 uid_t uid; 416 void *arg; 417 struct lwp *l; 418 { 419 ENTRY; 420 return (EOPNOTSUPP); 421 } 422 423 /* 424 * Get file system statistics. 425 */ 426 int 427 coda_nb_statvfs(vfsp, sbp, l) 428 struct mount *vfsp; 429 struct statvfs *sbp; 430 struct lwp *l; 431 { 432 struct coda_statfs fsstat; 433 struct proc *p = l->l_proc; 434 int error; 435 436 ENTRY; 437 MARK_ENTRY(CODA_STATFS_STATS); 438 if (!CODA_MOUNTED(vfsp)) { 439 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 440 return(EINVAL); 441 } 442 443 /* XXX - what to do about f_flags, others? --bnoble */ 444 /* Below This is what AFS does 445 #define NB_SFS_SIZ 0x895440 446 */ 447 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 448 449 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, l, &fsstat); 450 451 if (!error) { 452 sbp->f_bsize = 8192; /* XXX */ 453 sbp->f_frsize = 8192; /* XXX */ 454 sbp->f_iosize = 8192; /* XXX */ 455 sbp->f_blocks = fsstat.f_blocks; 456 sbp->f_bfree = fsstat.f_bfree; 457 sbp->f_bavail = fsstat.f_bavail; 458 sbp->f_bresvd = 0; 459 sbp->f_files = fsstat.f_files; 460 sbp->f_ffree = fsstat.f_ffree; 461 sbp->f_favail = fsstat.f_ffree; 462 sbp->f_fresvd = 0; 463 copy_statvfs_info(sbp, vfsp); 464 } 465 466 MARK_INT_SAT(CODA_STATFS_STATS); 467 return(error); 468 } 469 470 /* 471 * Flush any pending I/O. 472 */ 473 int 474 coda_sync(vfsp, waitfor, cred, l) 475 struct mount *vfsp; 476 int waitfor; 477 struct ucred *cred; 478 struct lwp *l; 479 { 480 ENTRY; 481 MARK_ENTRY(CODA_SYNC_STATS); 482 MARK_INT_SAT(CODA_SYNC_STATS); 483 return(0); 484 } 485 486 int 487 coda_vget(vfsp, ino, vpp, l) 488 struct mount *vfsp; 489 ino_t ino; 490 struct vnode **vpp; 491 struct lwp *l; 492 { 493 ENTRY; 494 return (EOPNOTSUPP); 495 } 496 497 /* 498 * fhtovp is now what vget used to be in 4.3-derived systems. For 499 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 500 * a type-specific fid. 501 */ 502 int 503 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp, l) 504 struct mount *vfsp; 505 struct fid *fhp; 506 struct mbuf *nam; 507 struct vnode **vpp; 508 int *exflagsp; 509 struct ucred **creadanonp; 510 struct lwp *l; 511 { 512 struct cfid *cfid = (struct cfid *)fhp; 513 struct cnode *cp = 0; 514 int error; 515 struct proc *p; 516 CodaFid VFid; 517 int vtype; 518 519 p = l->l_proc; 520 ENTRY; 521 522 MARK_ENTRY(CODA_VGET_STATS); 523 /* Check for vget of control object. */ 524 if (IS_CTL_FID(&cfid->cfid_fid)) { 525 *vpp = coda_ctlvp; 526 vref(coda_ctlvp); 527 MARK_INT_SAT(CODA_VGET_STATS); 528 return(0); 529 } 530 531 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, l, &VFid, &vtype); 532 533 if (error) { 534 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 535 *vpp = (struct vnode *)0; 536 } else { 537 CODADEBUG(CODA_VGET, 538 myprintf(("vget: %s type %d result %d\n", 539 coda_f2s(&VFid), vtype, error)); ) 540 541 cp = make_coda_node(&VFid, vfsp, vtype); 542 *vpp = CTOV(cp); 543 } 544 return(error); 545 } 546 547 int 548 coda_vptofh(vnp, fidp) 549 struct vnode *vnp; 550 struct fid *fidp; 551 { 552 ENTRY; 553 return (EOPNOTSUPP); 554 } 555 556 void 557 coda_init(void) 558 { 559 ENTRY; 560 } 561 562 void 563 coda_done(void) 564 { 565 ENTRY; 566 } 567 568 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 569 { 570 sysctl_createv(clog, 0, NULL, NULL, 571 CTLFLAG_PERMANENT, 572 CTLTYPE_NODE, "vfs", NULL, 573 NULL, 0, NULL, 0, 574 CTL_VFS, CTL_EOL); 575 sysctl_createv(clog, 0, NULL, NULL, 576 CTLFLAG_PERMANENT, 577 CTLTYPE_NODE, "coda", 578 SYSCTL_DESCR("code vfs options"), 579 NULL, 0, NULL, 0, 580 CTL_VFS, 18, CTL_EOL); 581 /* 582 * XXX the "18" above could be dynamic, thereby eliminating 583 * one more instance of the "number to vfs" mapping problem, 584 * but "18" is the order as taken from sys/mount.h 585 */ 586 587 /* 588 sysctl_createv(clog, 0, NULL, NULL, 589 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 590 CTLTYPE_INT, "clusterread", 591 SYSCTL_DESCR( anyone? ), 592 NULL, 0, &doclusterread, 0, 593 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 594 */ 595 } 596 597 /* 598 * To allow for greater ease of use, some vnodes may be orphaned when 599 * Venus dies. Certain operations should still be allowed to go 600 * through, but without propagating orphan-ness. So this function will 601 * get a new vnode for the file from the current run of Venus. 602 */ 603 604 int 605 getNewVnode(vpp) 606 struct vnode **vpp; 607 { 608 struct cfid cfid; 609 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 610 611 ENTRY; 612 613 cfid.cfid_len = (short)sizeof(CodaFid); 614 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 615 /* XXX ? */ 616 617 /* We're guessing that if set, the 1st element on the list is a 618 * valid vnode to use. If not, return ENODEV as venus is dead. 619 */ 620 if (mi->mi_vfsp == NULL) 621 return ENODEV; 622 623 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 624 NULL, NULL, curlwp); /* XXX */ 625 } 626 627 #include <ufs/ufs/quota.h> 628 #include <ufs/ufs/ufsmount.h> 629 /* get the mount structure corresponding to a given device. Assume 630 * device corresponds to a UFS. Return NULL if no device is found. 631 */ 632 struct mount *devtomp(dev) 633 dev_t dev; 634 { 635 struct mount *mp, *nmp; 636 637 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 638 nmp = mp->mnt_list.cqe_next; 639 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 640 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 641 /* mount corresponds to UFS and the device matches one we want */ 642 return(mp); 643 } 644 } 645 /* mount structure wasn't found */ 646 return(NULL); 647 } 648
Indexes created Thu Oct 02 01:09:59 GMT 2025