coda_vfsops.c revision 1.37
1 /* $NetBSD: coda_vfsops.c,v 1.37 2004/05/25 04:44:43 atatat 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 1.37 2004/05/25 04:44:43 atatat 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 coda_vnodeopv_descs, 124 0 125 }; 126 127 128 int 129 coda_vfsopstats_init(void) 130 { 131 int i; 132 133 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 134 coda_vfsopstats[i].opcode = i; 135 coda_vfsopstats[i].entries = 0; 136 coda_vfsopstats[i].sat_intrn = 0; 137 coda_vfsopstats[i].unsat_intrn = 0; 138 coda_vfsopstats[i].gen_intrn = 0; 139 } 140 141 return 0; 142 } 143 144 /* 145 * cfs mount vfsop 146 * Set up mount info record and attach it to vfs struct. 147 */ 148 /*ARGSUSED*/ 149 int 150 coda_mount(vfsp, path, data, ndp, p) 151 struct mount *vfsp; /* Allocated and initialized by mount(2) */ 152 const char *path; /* path covered: ignored by the fs-layer */ 153 void *data; /* Need to define a data type for this in netbsd? */ 154 struct nameidata *ndp; /* Clobber this to lookup the device name */ 155 struct proc *p; /* The ever-famous proc pointer */ 156 { 157 struct vnode *dvp; 158 struct cnode *cp; 159 dev_t dev; 160 struct coda_mntinfo *mi; 161 struct vnode *rootvp; 162 const struct cdevsw *cdev; 163 CodaFid rootfid = INVAL_FID; 164 CodaFid ctlfid = CTL_FID; 165 int error; 166 167 if (vfsp->mnt_flag & MNT_GETARGS) 168 return 0; 169 ENTRY; 170 171 coda_vfsopstats_init(); 172 coda_vnodeopstats_init(); 173 174 MARK_ENTRY(CODA_MOUNT_STATS); 175 if (CODA_MOUNTED(vfsp)) { 176 MARK_INT_FAIL(CODA_MOUNT_STATS); 177 return(EBUSY); 178 } 179 180 /* Validate mount device. Similar to getmdev(). */ 181 182 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); 183 error = namei(ndp); 184 dvp = ndp->ni_vp; 185 186 if (error) { 187 MARK_INT_FAIL(CODA_MOUNT_STATS); 188 return (error); 189 } 190 if (dvp->v_type != VCHR) { 191 MARK_INT_FAIL(CODA_MOUNT_STATS); 192 vrele(dvp); 193 return(ENXIO); 194 } 195 dev = dvp->v_specinfo->si_rdev; 196 vrele(dvp); 197 cdev = cdevsw_lookup(dev); 198 if (cdev == NULL) { 199 MARK_INT_FAIL(CODA_MOUNT_STATS); 200 return(ENXIO); 201 } 202 203 /* 204 * See if the device table matches our expectations. 205 */ 206 if (cdev != &vcoda_cdevsw) 207 { 208 MARK_INT_FAIL(CODA_MOUNT_STATS); 209 return(ENXIO); 210 } 211 212 if (minor(dev) >= NVCODA || minor(dev) < 0) { 213 MARK_INT_FAIL(CODA_MOUNT_STATS); 214 return(ENXIO); 215 } 216 217 /* 218 * Initialize the mount record and link it to the vfs struct 219 */ 220 mi = &coda_mnttbl[minor(dev)]; 221 222 if (!VC_OPEN(&mi->mi_vcomm)) { 223 MARK_INT_FAIL(CODA_MOUNT_STATS); 224 return(ENODEV); 225 } 226 227 /* No initialization (here) of mi_vcomm! */ 228 vfsp->mnt_data = mi; 229 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 230 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 231 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 232 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 233 mi->mi_vfsp = vfsp; 234 235 /* 236 * Make a root vnode to placate the Vnode interface, but don't 237 * actually make the CODA_ROOT call to venus until the first call 238 * to coda_root in case a server is down while venus is starting. 239 */ 240 cp = make_coda_node(&rootfid, vfsp, VDIR); 241 rootvp = CTOV(cp); 242 rootvp->v_flag |= VROOT; 243 244 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 245 The above code seems to cause a loop in the cnode links. 246 I don't totally understand when it happens, it is caught 247 when closing down the system. 248 */ 249 cp = make_coda_node(&ctlfid, 0, VCHR); 250 251 coda_ctlvp = CTOV(cp); 252 253 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 254 mi->mi_vfsp = vfsp; 255 mi->mi_rootvp = rootvp; 256 257 /* set filesystem block size */ 258 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 259 vfsp->mnt_stat.f_frsize = 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 set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 271 p); 272 } 273 274 int 275 coda_start(vfsp, flags, p) 276 struct mount *vfsp; 277 int flags; 278 struct proc *p; 279 { 280 ENTRY; 281 vftomi(vfsp)->mi_started = 1; 282 return (0); 283 } 284 285 int 286 coda_unmount(vfsp, mntflags, p) 287 struct mount *vfsp; 288 int mntflags; 289 struct proc *p; 290 { 291 struct coda_mntinfo *mi = vftomi(vfsp); 292 int active, error = 0; 293 294 ENTRY; 295 MARK_ENTRY(CODA_UMOUNT_STATS); 296 if (!CODA_MOUNTED(vfsp)) { 297 MARK_INT_FAIL(CODA_UMOUNT_STATS); 298 return(EINVAL); 299 } 300 301 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 302 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 303 return (EBUSY); /* Venus is still running */ 304 305 #ifdef DEBUG 306 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 307 #endif 308 mi->mi_started = 0; 309 310 vrele(mi->mi_rootvp); 311 312 active = coda_kill(vfsp, NOT_DOWNCALL); 313 mi->mi_rootvp->v_flag &= ~VROOT; 314 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 315 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 316 error = 0; 317 318 /* I'm going to take this out to allow lookups to go through. I'm 319 * not sure it's important anyway. -- DCS 2/2/94 320 */ 321 /* vfsp->VFS_DATA = NULL; */ 322 323 /* No more vfsp's to hold onto */ 324 mi->mi_vfsp = NULL; 325 mi->mi_rootvp = NULL; 326 327 if (error) 328 MARK_INT_FAIL(CODA_UMOUNT_STATS); 329 else 330 MARK_INT_SAT(CODA_UMOUNT_STATS); 331 332 return(error); 333 } 334 return (EINVAL); 335 } 336 337 /* 338 * find root of cfs 339 */ 340 int 341 coda_root(vfsp, vpp) 342 struct mount *vfsp; 343 struct vnode **vpp; 344 { 345 struct coda_mntinfo *mi = vftomi(vfsp); 346 int error; 347 struct proc *p = curproc; /* XXX - bnoble */ 348 CodaFid VFid; 349 static const CodaFid invalfid = INVAL_FID; 350 351 ENTRY; 352 MARK_ENTRY(CODA_ROOT_STATS); 353 354 if (vfsp == mi->mi_vfsp) { 355 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 356 { /* Found valid root. */ 357 *vpp = mi->mi_rootvp; 358 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 359 vref(*vpp); 360 vn_lock(*vpp, LK_EXCLUSIVE); 361 MARK_INT_SAT(CODA_ROOT_STATS); 362 return(0); 363 } 364 } 365 366 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid); 367 368 if (!error) { 369 /* 370 * Save the new rootfid in the cnode, and rehash the cnode into the 371 * cnode hash with the new fid key. 372 */ 373 coda_unsave(VTOC(mi->mi_rootvp)); 374 VTOC(mi->mi_rootvp)->c_fid = VFid; 375 coda_save(VTOC(mi->mi_rootvp)); 376 377 *vpp = mi->mi_rootvp; 378 vref(*vpp); 379 vn_lock(*vpp, LK_EXCLUSIVE); 380 MARK_INT_SAT(CODA_ROOT_STATS); 381 goto exit; 382 } else if (error == ENODEV || error == EINTR) { 383 /* Gross hack here! */ 384 /* 385 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 386 * ENODEV. Return the uninitialized root vnode to allow vfs 387 * operations such as unmount to continue. Without this hack, 388 * there is no way to do an unmount if Venus dies before a 389 * successful CODA_ROOT call is done. All vnode operations 390 * will fail. 391 */ 392 *vpp = mi->mi_rootvp; 393 vref(*vpp); 394 vn_lock(*vpp, LK_EXCLUSIVE); 395 MARK_INT_FAIL(CODA_ROOT_STATS); 396 error = 0; 397 goto exit; 398 } else { 399 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 400 MARK_INT_FAIL(CODA_ROOT_STATS); 401 402 goto exit; 403 } 404 exit: 405 return(error); 406 } 407 408 int 409 coda_quotactl(vfsp, cmd, uid, arg, p) 410 struct mount *vfsp; 411 int cmd; 412 uid_t uid; 413 void *arg; 414 struct proc *p; 415 { 416 ENTRY; 417 return (EOPNOTSUPP); 418 } 419 420 /* 421 * Get file system statistics. 422 */ 423 int 424 coda_nb_statvfs(vfsp, sbp, p) 425 struct mount *vfsp; 426 struct statvfs *sbp; 427 struct proc *p; 428 { 429 struct coda_statfs fsstat; 430 int error; 431 432 ENTRY; 433 MARK_ENTRY(CODA_STATFS_STATS); 434 if (!CODA_MOUNTED(vfsp)) { 435 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 436 return(EINVAL); 437 } 438 439 /* 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_bsize = 8192; /* XXX */ 449 sbp->f_frsize = 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_bresvd = 0; 455 sbp->f_files = fsstat.f_files; 456 sbp->f_ffree = fsstat.f_ffree; 457 sbp->f_favail = fsstat.f_ffree; 458 sbp->f_fresvd = 0; 459 copy_statvfs_info(sbp, vfsp); 460 } 461 462 MARK_INT_SAT(CODA_STATFS_STATS); 463 return(error); 464 } 465 466 /* 467 * Flush any pending I/O. 468 */ 469 int 470 coda_sync(vfsp, waitfor, cred, p) 471 struct mount *vfsp; 472 int waitfor; 473 struct ucred *cred; 474 struct proc *p; 475 { 476 ENTRY; 477 MARK_ENTRY(CODA_SYNC_STATS); 478 MARK_INT_SAT(CODA_SYNC_STATS); 479 return(0); 480 } 481 482 int 483 coda_vget(vfsp, ino, vpp) 484 struct mount *vfsp; 485 ino_t ino; 486 struct vnode **vpp; 487 { 488 ENTRY; 489 return (EOPNOTSUPP); 490 } 491 492 /* 493 * fhtovp is now what vget used to be in 4.3-derived systems. For 494 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 495 * a type-specific fid. 496 */ 497 int 498 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) 499 struct mount *vfsp; 500 struct fid *fhp; 501 struct mbuf *nam; 502 struct vnode **vpp; 503 int *exflagsp; 504 struct ucred **creadanonp; 505 { 506 struct cfid *cfid = (struct cfid *)fhp; 507 struct cnode *cp = 0; 508 int error; 509 struct proc *p = curproc; /* XXX -mach */ 510 CodaFid VFid; 511 int vtype; 512 513 ENTRY; 514 515 MARK_ENTRY(CODA_VGET_STATS); 516 /* Check for vget of control object. */ 517 if (IS_CTL_FID(&cfid->cfid_fid)) { 518 *vpp = coda_ctlvp; 519 vref(coda_ctlvp); 520 MARK_INT_SAT(CODA_VGET_STATS); 521 return(0); 522 } 523 524 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype); 525 526 if (error) { 527 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 528 *vpp = (struct vnode *)0; 529 } else { 530 CODADEBUG(CODA_VGET, 531 myprintf(("vget: %s type %d result %d\n", 532 coda_f2s(&VFid), vtype, error)); ) 533 534 cp = make_coda_node(&VFid, vfsp, vtype); 535 *vpp = CTOV(cp); 536 } 537 return(error); 538 } 539 540 int 541 coda_vptofh(vnp, fidp) 542 struct vnode *vnp; 543 struct fid *fidp; 544 { 545 ENTRY; 546 return (EOPNOTSUPP); 547 } 548 549 void 550 coda_init(void) 551 { 552 ENTRY; 553 } 554 555 void 556 coda_done(void) 557 { 558 ENTRY; 559 } 560 561 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 562 { 563 sysctl_createv(clog, 0, NULL, NULL, 564 CTLFLAG_PERMANENT, 565 CTLTYPE_NODE, "vfs", NULL, 566 NULL, 0, NULL, 0, 567 CTL_VFS, CTL_EOL); 568 sysctl_createv(clog, 0, NULL, NULL, 569 CTLFLAG_PERMANENT, 570 CTLTYPE_NODE, "coda", 571 SYSCTL_DESCR("code vfs options"), 572 NULL, 0, NULL, 0, 573 CTL_VFS, 18, CTL_EOL); 574 /* 575 * XXX the "18" above could be dynamic, thereby eliminating 576 * one more instance of the "number to vfs" mapping problem, 577 * but "18" is the order as taken from sys/mount.h 578 */ 579 580 /* 581 sysctl_createv(clog, 0, NULL, NULL, 582 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 583 CTLTYPE_INT, "clusterread", 584 SYSCTL_DESCR( anyone? ), 585 NULL, 0, &doclusterread, 0, 586 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 587 */ 588 } 589 590 /* 591 * To allow for greater ease of use, some vnodes may be orphaned when 592 * Venus dies. Certain operations should still be allowed to go 593 * through, but without propagating orphan-ness. So this function will 594 * get a new vnode for the file from the current run of Venus. 595 */ 596 597 int 598 getNewVnode(vpp) 599 struct vnode **vpp; 600 { 601 struct cfid cfid; 602 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 603 604 ENTRY; 605 606 cfid.cfid_len = (short)sizeof(CodaFid); 607 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 608 /* XXX ? */ 609 610 /* We're guessing that if set, the 1st element on the list is a 611 * valid vnode to use. If not, return ENODEV as venus is dead. 612 */ 613 if (mi->mi_vfsp == NULL) 614 return ENODEV; 615 616 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 617 NULL, NULL); 618 } 619 620 #include <ufs/ufs/quota.h> 621 #include <ufs/ufs/ufsmount.h> 622 /* get the mount structure corresponding to a given device. Assume 623 * device corresponds to a UFS. Return NULL if no device is found. 624 */ 625 struct mount *devtomp(dev) 626 dev_t dev; 627 { 628 struct mount *mp, *nmp; 629 630 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 631 nmp = mp->mnt_list.cqe_next; 632 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 633 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 634 /* mount corresponds to UFS and the device matches one we want */ 635 return(mp); 636 } 637 } 638 /* mount structure wasn't found */ 639 return(NULL); 640 } 641
Indexes created Wed Sep 24 15:09:51 GMT 2025