coda_vfsops.c revision 1.41
1 /* $NetBSD: coda_vfsops.c,v 1.41 2005/01/02 16:08:28 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 1.41 2005/01/02 16:08:28 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/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 ** )) 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 vfs_stdextattrctl, 125 coda_vnodeopv_descs, 126 0 127 }; 128 129 130 int 131 coda_vfsopstats_init(void) 132 { 133 int i; 134 135 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 136 coda_vfsopstats[i].opcode = i; 137 coda_vfsopstats[i].entries = 0; 138 coda_vfsopstats[i].sat_intrn = 0; 139 coda_vfsopstats[i].unsat_intrn = 0; 140 coda_vfsopstats[i].gen_intrn = 0; 141 } 142 143 return 0; 144 } 145 146 /* 147 * cfs mount vfsop 148 * Set up mount info record and attach it to vfs struct. 149 */ 150 /*ARGSUSED*/ 151 int 152 coda_mount(vfsp, path, data, ndp, p) 153 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 154 const char *path; /* path covered: ignored by the fs-layer */ 155 void *data; /* Need to define a data type for this in netbsd? */ 156 struct nameidata *ndp; /* Clobber this to lookup the device name */ 157 struct proc *p; /* The ever-famous proc pointer */ 158 { 159 struct vnode *dvp; 160 struct cnode *cp; 161 dev_t dev; 162 struct coda_mntinfo *mi; 163 struct vnode *rootvp; 164 const struct cdevsw *cdev; 165 CodaFid rootfid = INVAL_FID; 166 CodaFid ctlfid = CTL_FID; 167 int error; 168 169 if (vfsp->mnt_flag & MNT_GETARGS) 170 return 0; 171 ENTRY; 172 173 coda_vfsopstats_init(); 174 coda_vnodeopstats_init(); 175 176 MARK_ENTRY(CODA_MOUNT_STATS); 177 if (CODA_MOUNTED(vfsp)) { 178 MARK_INT_FAIL(CODA_MOUNT_STATS); 179 return(EBUSY); 180 } 181 182 /* Validate mount device. Similar to getmdev(). */ 183 184 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 185 error = namei(ndp); 186 dvp = ndp->ni_vp; 187 188 if (error) { 189 MARK_INT_FAIL(CODA_MOUNT_STATS); 190 return (error); 191 } 192 if (dvp->v_type != VCHR) { 193 MARK_INT_FAIL(CODA_MOUNT_STATS); 194 vrele(dvp); 195 return(ENXIO); 196 } 197 dev = dvp->v_specinfo->si_rdev; 198 vrele(dvp); 199 cdev = cdevsw_lookup(dev); 200 if (cdev == NULL) { 201 MARK_INT_FAIL(CODA_MOUNT_STATS); 202 return(ENXIO); 203 } 204 205 /* 206 * See if the device table matches our expectations. 207 */ 208 if (cdev != &vcoda_cdevsw) 209 { 210 MARK_INT_FAIL(CODA_MOUNT_STATS); 211 return(ENXIO); 212 } 213 214 if (minor(dev) >= NVCODA || minor(dev) < 0) { 215 MARK_INT_FAIL(CODA_MOUNT_STATS); 216 return(ENXIO); 217 } 218 219 /* 220 * Initialize the mount record and link it to the vfs struct 221 */ 222 mi = &coda_mnttbl[minor(dev)]; 223 224 if (!VC_OPEN(&mi->mi_vcomm)) { 225 MARK_INT_FAIL(CODA_MOUNT_STATS); 226 return(ENODEV); 227 } 228 229 /* No initialization (here) of mi_vcomm! */ 230 vfsp->mnt_data = mi; 231 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 232 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 233 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 234 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 235 mi->mi_vfsp = vfsp; 236 237 /* 238 * Make a root vnode to placate the Vnode interface, but don't 239 * actually make the CODA_ROOT call to venus until the first call 240 * to coda_root in case a server is down while venus is starting. 241 */ 242 cp = make_coda_node(&rootfid, vfsp, VDIR); 243 rootvp = CTOV(cp); 244 rootvp->v_flag |= VROOT; 245 246 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 247 The above code seems to cause a loop in the cnode links. 248 I don't totally understand when it happens, it is caught 249 when closing down the system. 250 */ 251 cp = make_coda_node(&ctlfid, 0, VCHR); 252 253 coda_ctlvp = CTOV(cp); 254 255 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 256 mi->mi_vfsp = vfsp; 257 mi->mi_rootvp = rootvp; 258 259 /* set filesystem block size */ 260 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 261 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 262 263 /* error is currently guaranteed to be zero, but in case some 264 code changes... */ 265 CODADEBUG(1, 266 myprintf(("coda_mount returned %d\n",error));); 267 if (error) 268 MARK_INT_FAIL(CODA_MOUNT_STATS); 269 else 270 MARK_INT_SAT(CODA_MOUNT_STATS); 271 272 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 273 p); 274 } 275 276 int 277 coda_start(vfsp, flags, p) 278 struct mount *vfsp; 279 int flags; 280 struct proc *p; 281 { 282 ENTRY; 283 vftomi(vfsp)->mi_started = 1; 284 return (0); 285 } 286 287 int 288 coda_unmount(vfsp, mntflags, p) 289 struct mount *vfsp; 290 int mntflags; 291 struct proc *p; 292 { 293 struct coda_mntinfo *mi = vftomi(vfsp); 294 int active, error = 0; 295 296 ENTRY; 297 MARK_ENTRY(CODA_UMOUNT_STATS); 298 if (!CODA_MOUNTED(vfsp)) { 299 MARK_INT_FAIL(CODA_UMOUNT_STATS); 300 return(EINVAL); 301 } 302 303 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 304 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 305 return (EBUSY); /* Venus is still running */ 306 307 #ifdef DEBUG 308 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 309 #endif 310 mi->mi_started = 0; 311 312 vrele(mi->mi_rootvp); 313 314 active = coda_kill(vfsp, NOT_DOWNCALL); 315 mi->mi_rootvp->v_flag &= ~VROOT; 316 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 317 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 318 error = 0; 319 320 /* I'm going to take this out to allow lookups to go through. I'm 321 * not sure it's important anyway. -- DCS 2/2/94 322 */ 323 /* vfsp->VFS_DATA = NULL; */ 324 325 /* No more vfsp's to hold onto */ 326 mi->mi_vfsp = NULL; 327 mi->mi_rootvp = NULL; 328 329 if (error) 330 MARK_INT_FAIL(CODA_UMOUNT_STATS); 331 else 332 MARK_INT_SAT(CODA_UMOUNT_STATS); 333 334 return(error); 335 } 336 return (EINVAL); 337 } 338 339 /* 340 * find root of cfs 341 */ 342 int 343 coda_root(vfsp, vpp) 344 struct mount *vfsp; 345 struct vnode **vpp; 346 { 347 struct coda_mntinfo *mi = vftomi(vfsp); 348 int error; 349 struct proc *p = curproc; /* XXX - bnoble */ 350 CodaFid VFid; 351 static const CodaFid invalfid = INVAL_FID; 352 353 ENTRY; 354 MARK_ENTRY(CODA_ROOT_STATS); 355 356 if (vfsp == mi->mi_vfsp) { 357 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 358 { /* Found valid root. */ 359 *vpp = mi->mi_rootvp; 360 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 361 vref(*vpp); 362 vn_lock(*vpp, LK_EXCLUSIVE); 363 MARK_INT_SAT(CODA_ROOT_STATS); 364 return(0); 365 } 366 } 367 368 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 369 370 if (!error) { 371 /* 372 * Save the new rootfid in the cnode, and rehash the cnode into the 373 * cnode hash with the new fid key. 374 */ 375 coda_unsave(VTOC(mi->mi_rootvp)); 376 VTOC(mi->mi_rootvp)->c_fid = VFid; 377 coda_save(VTOC(mi->mi_rootvp)); 378 379 *vpp = mi->mi_rootvp; 380 vref(*vpp); 381 vn_lock(*vpp, LK_EXCLUSIVE); 382 MARK_INT_SAT(CODA_ROOT_STATS); 383 goto exit; 384 } else if (error == ENODEV || error == EINTR) { 385 /* Gross hack here! */ 386 /* 387 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 388 * ENODEV. Return the uninitialized root vnode to allow vfs 389 * operations such as unmount to continue. Without this hack, 390 * there is no way to do an unmount if Venus dies before a 391 * successful CODA_ROOT call is done. All vnode operations 392 * will fail. 393 */ 394 *vpp = mi->mi_rootvp; 395 vref(*vpp); 396 vn_lock(*vpp, LK_EXCLUSIVE); 397 MARK_INT_FAIL(CODA_ROOT_STATS); 398 error = 0; 399 goto exit; 400 } else { 401 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 402 MARK_INT_FAIL(CODA_ROOT_STATS); 403 404 goto exit; 405 } 406 exit: 407 return(error); 408 } 409 410 int 411 coda_quotactl(vfsp, cmd, uid, arg, p) 412 struct mount *vfsp; 413 int cmd; 414 uid_t uid; 415 void *arg; 416 struct proc *p; 417 { 418 ENTRY; 419 return (EOPNOTSUPP); 420 } 421 422 /* 423 * Get file system statistics. 424 */ 425 int 426 coda_nb_statvfs(vfsp, sbp, p) 427 struct mount *vfsp; 428 struct statvfs *sbp; 429 struct proc *p; 430 { 431 struct coda_statfs fsstat; 432 int error; 433 434 ENTRY; 435 MARK_ENTRY(CODA_STATFS_STATS); 436 if (!CODA_MOUNTED(vfsp)) { 437 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 438 return(EINVAL); 439 } 440 441 /* XXX - what to do about f_flags, others? --bnoble */ 442 /* Below This is what AFS does 443 #define NB_SFS_SIZ 0x895440 444 */ 445 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 446 447 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 448 449 if (!error) { 450 sbp->f_bsize = 8192; /* XXX */ 451 sbp->f_frsize = 8192; /* XXX */ 452 sbp->f_iosize = 8192; /* XXX */ 453 sbp->f_blocks = fsstat.f_blocks; 454 sbp->f_bfree = fsstat.f_bfree; 455 sbp->f_bavail = fsstat.f_bavail; 456 sbp->f_bresvd = 0; 457 sbp->f_files = fsstat.f_files; 458 sbp->f_ffree = fsstat.f_ffree; 459 sbp->f_favail = fsstat.f_ffree; 460 sbp->f_fresvd = 0; 461 copy_statvfs_info(sbp, vfsp); 462 } 463 464 MARK_INT_SAT(CODA_STATFS_STATS); 465 return(error); 466 } 467 468 /* 469 * Flush any pending I/O. 470 */ 471 int 472 coda_sync(vfsp, waitfor, cred, p) 473 struct mount *vfsp; 474 int waitfor; 475 struct ucred *cred; 476 struct proc *p; 477 { 478 ENTRY; 479 MARK_ENTRY(CODA_SYNC_STATS); 480 MARK_INT_SAT(CODA_SYNC_STATS); 481 return(0); 482 } 483 484 int 485 coda_vget(vfsp, ino, vpp) 486 struct mount *vfsp; 487 ino_t ino; 488 struct vnode **vpp; 489 { 490 ENTRY; 491 return (EOPNOTSUPP); 492 } 493 494 /* 495 * fhtovp is now what vget used to be in 4.3-derived systems. For 496 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 497 * a type-specific fid. 498 */ 499 int 500 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 501 struct mount *vfsp; 502 struct fid *fhp; 503 struct mbuf *nam; 504 struct vnode **vpp; 505 int *exflagsp; 506 struct ucred **creadanonp; 507 { 508 struct cfid *cfid = (struct cfid *)fhp; 509 struct cnode *cp = 0; 510 int error; 511 struct proc *p = curproc; /* XXX -mach */ 512 CodaFid VFid; 513 int vtype; 514 515 ENTRY; 516 517 MARK_ENTRY(CODA_VGET_STATS); 518 /* Check for vget of control object. */ 519 if (IS_CTL_FID(&cfid->cfid_fid)) { 520 *vpp = coda_ctlvp; 521 vref(coda_ctlvp); 522 MARK_INT_SAT(CODA_VGET_STATS); 523 return(0); 524 } 525 526 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 527 528 if (error) { 529 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 530 *vpp = (struct vnode *)0; 531 } else { 532 CODADEBUG(CODA_VGET, 533 myprintf(("vget: %s type %d result %d\n", 534 coda_f2s(&VFid), vtype, error)); ) 535 536 cp = make_coda_node(&VFid, vfsp, vtype); 537 *vpp = CTOV(cp); 538 } 539 return(error); 540 } 541 542 int 543 coda_vptofh(vnp, fidp) 544 struct vnode *vnp; 545 struct fid *fidp; 546 { 547 ENTRY; 548 return (EOPNOTSUPP); 549 } 550 551 void 552 coda_init(void) 553 { 554 ENTRY; 555 } 556 557 void 558 coda_done(void) 559 { 560 ENTRY; 561 } 562 563 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 564 { 565 sysctl_createv(clog, 0, NULL, NULL, 566 CTLFLAG_PERMANENT, 567 CTLTYPE_NODE, "vfs", NULL, 568 NULL, 0, NULL, 0, 569 CTL_VFS, CTL_EOL); 570 sysctl_createv(clog, 0, NULL, NULL, 571 CTLFLAG_PERMANENT, 572 CTLTYPE_NODE, "coda", 573 SYSCTL_DESCR("code vfs options"), 574 NULL, 0, NULL, 0, 575 CTL_VFS, 18, CTL_EOL); 576 /* 577 * XXX the "18" above could be dynamic, thereby eliminating 578 * one more instance of the "number to vfs" mapping problem, 579 * but "18" is the order as taken from sys/mount.h 580 */ 581 582 /* 583 sysctl_createv(clog, 0, NULL, NULL, 584 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 585 CTLTYPE_INT, "clusterread", 586 SYSCTL_DESCR( anyone? ), 587 NULL, 0, &doclusterread, 0, 588 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 589 */ 590 } 591 592 /* 593 * To allow for greater ease of use, some vnodes may be orphaned when 594 * Venus dies. Certain operations should still be allowed to go 595 * through, but without propagating orphan-ness. So this function will 596 * get a new vnode for the file from the current run of Venus. 597 */ 598 599 int 600 getNewVnode(vpp) 601 struct vnode **vpp; 602 { 603 struct cfid cfid; 604 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 605 606 ENTRY; 607 608 cfid.cfid_len = (short)sizeof(CodaFid); 609 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 610 /* XXX ? */ 611 612 /* We're guessing that if set, the 1st element on the list is a 613 * valid vnode to use. If not, return ENODEV as venus is dead. 614 */ 615 if (mi->mi_vfsp == NULL) 616 return ENODEV; 617 618 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 619 NULL, NULL); 620 } 621 622 #include <ufs/ufs/quota.h> 623 #include <ufs/ufs/ufsmount.h> 624 /* get the mount structure corresponding to a given device. Assume 625 * device corresponds to a UFS. Return NULL if no device is found. 626 */ 627 struct mount *devtomp(dev) 628 dev_t dev; 629 { 630 struct mount *mp, *nmp; 631 632 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 633 nmp = mp->mnt_list.cqe_next; 634 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 635 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 636 /* mount corresponds to UFS and the device matches one we want */ 637 return(mp); 638 } 639 } 640 /* mount structure wasn't found */ 641 return(NULL); 642 } 643
Indexes created Tue Sep 23 22:09:46 GMT 2025