coda_vfsops.c revision 1.34
1 /* $NetBSD: coda_vfsops.c,v 1.34 2004/04/21 01:05:35 christos 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 1.34 2004/04/21 01:05:35 christos 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/mount.h> 63 #include <sys/proc.h> 64 #include <sys/select.h> 65 66 #include <coda/coda.h> 67 #include <coda/cnode.h> 68 #include <coda/coda_vfsops.h> 69 #include <coda/coda_venus.h> 70 #include <coda/coda_subr.h> 71 #include <coda/coda_opstats.h> 72 /* for VN_RDEV */ 73 #include <miscfs/specfs/specdev.h> 74 75 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 76 77 int codadebug = 0; 78 79 int coda_vfsop_print_entry = 0; 80 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 81 82 struct vnode *coda_ctlvp; 83 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 84 85 /* structure to keep statistics of internally generated/satisfied calls */ 86 87 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 88 89 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 90 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 91 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 92 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 93 94 extern const struct cdevsw vcoda_cdevsw; 95 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 96 97 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 98 &coda_vnodeop_opv_desc, 99 NULL, 100 }; 101 102 struct vfsops coda_vfsops = { 103 MOUNT_CODA, 104 coda_mount, 105 coda_start, 106 coda_unmount, 107 coda_root, 108 coda_quotactl, 109 coda_nb_statvfs, 110 coda_sync, 111 coda_vget, 112 (int (*) (struct mount *, struct fid *, struct vnode ** )) 113 eopnotsupp, 114 (int (*) (struct vnode *, struct fid *)) eopnotsupp, 115 coda_init, 116 NULL, 117 coda_done, 118 NULL, 119 (int (*)(void)) eopnotsupp, 120 (int (*)(struct mount *, struct mbuf *, int *, struct ucred **)) 121 eopnotsupp, 122 coda_vnodeopv_descs, 123 0 124 }; 125 126 127 int 128 coda_vfsopstats_init(void) 129 { 130 int i; 131 132 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 133 coda_vfsopstats[i].opcode = i; 134 coda_vfsopstats[i].entries = 0; 135 coda_vfsopstats[i].sat_intrn = 0; 136 coda_vfsopstats[i].unsat_intrn = 0; 137 coda_vfsopstats[i].gen_intrn = 0; 138 } 139 140 return 0; 141 } 142 143 /* 144 * cfs mount vfsop 145 * Set up mount info record and attach it to vfs struct. 146 */ 147 /*ARGSUSED*/ 148 int 149 coda_mount(vfsp, path, data, ndp, p) 150 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 151 const char *path; /* path covered: ignored by the fs-layer */ 152 void *data; /* Need to define a data type for this in netbsd? */ 153 struct nameidata *ndp; /* Clobber this to lookup the device name */ 154 struct proc *p; /* The ever-famous proc pointer */ 155 { 156 struct vnode *dvp; 157 struct cnode *cp; 158 dev_t dev; 159 struct coda_mntinfo *mi; 160 struct vnode *rootvp; 161 const struct cdevsw *cdev; 162 CodaFid rootfid = INVAL_FID; 163 CodaFid ctlfid = CTL_FID; 164 int error; 165 166 if (vfsp->mnt_flag & MNT_GETARGS) 167 return 0; 168 ENTRY; 169 170 coda_vfsopstats_init(); 171 coda_vnodeopstats_init(); 172 173 MARK_ENTRY(CODA_MOUNT_STATS); 174 if (CODA_MOUNTED(vfsp)) { 175 MARK_INT_FAIL(CODA_MOUNT_STATS); 176 return(EBUSY); 177 } 178 179 /* Validate mount device. Similar to getmdev(). */ 180 181 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 182 error = namei(ndp); 183 dvp = ndp->ni_vp; 184 185 if (error) { 186 MARK_INT_FAIL(CODA_MOUNT_STATS); 187 return (error); 188 } 189 if (dvp->v_type != VCHR) { 190 MARK_INT_FAIL(CODA_MOUNT_STATS); 191 vrele(dvp); 192 return(ENXIO); 193 } 194 dev = dvp->v_specinfo->si_rdev; 195 vrele(dvp); 196 cdev = cdevsw_lookup(dev); 197 if (cdev == NULL) { 198 MARK_INT_FAIL(CODA_MOUNT_STATS); 199 return(ENXIO); 200 } 201 202 /* 203 * See if the device table matches our expectations. 204 */ 205 if (cdev != &vcoda_cdevsw) 206 { 207 MARK_INT_FAIL(CODA_MOUNT_STATS); 208 return(ENXIO); 209 } 210 211 if (minor(dev) >= NVCODA || minor(dev) < 0) { 212 MARK_INT_FAIL(CODA_MOUNT_STATS); 213 return(ENXIO); 214 } 215 216 /* 217 * Initialize the mount record and link it to the vfs struct 218 */ 219 mi = &coda_mnttbl[minor(dev)]; 220 221 if (!VC_OPEN(&mi->mi_vcomm)) { 222 MARK_INT_FAIL(CODA_MOUNT_STATS); 223 return(ENODEV); 224 } 225 226 /* No initialization (here) of mi_vcomm! */ 227 vfsp->mnt_data = mi; 228 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 229 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 230 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 231 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 232 mi->mi_vfsp = vfsp; 233 234 /* 235 * Make a root vnode to placate the Vnode interface, but don't 236 * actually make the CODA_ROOT call to venus until the first call 237 * to coda_root in case a server is down while venus is starting. 238 */ 239 cp = make_coda_node(&rootfid, vfsp, VDIR); 240 rootvp = CTOV(cp); 241 rootvp->v_flag |= VROOT; 242 243 /* 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 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 259 260 /* error is currently guaranteed to be zero, but in case some 261 code changes... */ 262 CODADEBUG(1, 263 myprintf(("coda_mount returned %d\n",error));); 264 if (error) 265 MARK_INT_FAIL(CODA_MOUNT_STATS); 266 else 267 MARK_INT_SAT(CODA_MOUNT_STATS); 268 269 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 270 p); 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 vftomi(vfsp)->mi_started = 1; 281 return (0); 282 } 283 284 int 285 coda_unmount(vfsp, mntflags, p) 286 struct mount *vfsp; 287 int mntflags; 288 struct proc *p; 289 { 290 struct coda_mntinfo *mi = vftomi(vfsp); 291 int active, error = 0; 292 293 ENTRY; 294 MARK_ENTRY(CODA_UMOUNT_STATS); 295 if (!CODA_MOUNTED(vfsp)) { 296 MARK_INT_FAIL(CODA_UMOUNT_STATS); 297 return(EINVAL); 298 } 299 300 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 301 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 302 return (EBUSY); /* Venus is still running */ 303 304 #ifdef DEBUG 305 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 306 #endif 307 mi->mi_started = 0; 308 309 vrele(mi->mi_rootvp); 310 311 active = coda_kill(vfsp, NOT_DOWNCALL); 312 mi->mi_rootvp->v_flag &= ~VROOT; 313 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 314 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 315 error = 0; 316 317 /* I'm going to take this out to allow lookups to go through. I'm 318 * not sure it's important anyway. -- DCS 2/2/94 319 */ 320 /* vfsp->VFS_DATA = NULL; */ 321 322 /* No more vfsp's to hold onto */ 323 mi->mi_vfsp = NULL; 324 mi->mi_rootvp = NULL; 325 326 if (error) 327 MARK_INT_FAIL(CODA_UMOUNT_STATS); 328 else 329 MARK_INT_SAT(CODA_UMOUNT_STATS); 330 331 return(error); 332 } 333 return (EINVAL); 334 } 335 336 /* 337 * find root of cfs 338 */ 339 int 340 coda_root(vfsp, vpp) 341 struct mount *vfsp; 342 struct vnode **vpp; 343 { 344 struct coda_mntinfo *mi = vftomi(vfsp); 345 int error; 346 struct proc *p = curproc; /* XXX - bnoble */ 347 CodaFid VFid; 348 static const CodaFid invalfid = INVAL_FID; 349 350 ENTRY; 351 MARK_ENTRY(CODA_ROOT_STATS); 352 353 if (vfsp == mi->mi_vfsp) { 354 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 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_statvfs(vfsp, sbp, p) 424 struct mount *vfsp; 425 struct statvfs *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 /* XXX - what to do about f_flags, others? --bnoble */ 439 /* Below This is what AFS does 440 #define NB_SFS_SIZ 0x895440 441 */ 442 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 443 444 error = venus_statfs(vftomi(vfsp), p->p_cred->pc_ucred, p, &fsstat); 445 446 if (!error) { 447 sbp->f_bsize = 8192; /* XXX */ 448 sbp->f_frsize = 8192; /* XXX */ 449 sbp->f_iosize = 8192; /* XXX */ 450 sbp->f_blocks = fsstat.f_blocks; 451 sbp->f_bfree = fsstat.f_bfree; 452 sbp->f_bavail = fsstat.f_bavail; 453 sbp->f_bresvd = 0; 454 sbp->f_files = fsstat.f_files; 455 sbp->f_ffree = fsstat.f_ffree; 456 sbp->f_favail = fsstat.f_ffree; 457 sbp->f_fresvd = 0; 458 copy_statvfs_info(sbp, vfsp); 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 CodaFid 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: %s type %d result %d\n", 531 coda_f2s(&VFid), 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 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 561 { 562 sysctl_createv(clog, 0, NULL, NULL, 563 CTLFLAG_PERMANENT, 564 CTLTYPE_NODE, "vfs", NULL, 565 NULL, 0, NULL, 0, 566 CTL_VFS, CTL_EOL); 567 sysctl_createv(clog, 0, NULL, NULL, 568 CTLFLAG_PERMANENT, 569 CTLTYPE_NODE, "coda", NULL, 570 NULL, 0, NULL, 0, 571 CTL_VFS, 18, CTL_EOL); 572 /* 573 * XXX the "18" above could be dynamic, thereby eliminating 574 * one more instance of the "number to vfs" mapping problem, 575 * but "18" is the order as taken from sys/mount.h 576 */ 577 578 /* 579 sysctl_createv(clog, 0, NULL, NULL, 580 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 581 CTLTYPE_INT, "clusterread", NULL, 582 NULL, 0, &doclusterread, 0, 583 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 584 */ 585 } 586 587 /* 588 * To allow for greater ease of use, some vnodes may be orphaned when 589 * Venus dies. Certain operations should still be allowed to go 590 * through, but without propagating orphan-ness. So this function will 591 * get a new vnode for the file from the current run of Venus. 592 */ 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(CodaFid); 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 Fri Sep 26 20:09:58 GMT 2025