1 /* $NetBSD: coda_vfsops.c,v 1.68 2009/01/11 02:45:46 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 1.68 2009/01/11 02:45:46 christos Exp $"); 49 50 #ifndef _KERNEL_OPT 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 #include <sys/kauth.h> 67 #include <sys/module.h> 68 69 #include <coda/coda.h> 70 #include <coda/cnode.h> 71 #include <coda/coda_vfsops.h> 72 #include <coda/coda_venus.h> 73 #include <coda/coda_subr.h> 74 #include <coda/coda_opstats.h> 75 /* for VN_RDEV */ 76 #include <miscfs/specfs/specdev.h> 77 #include <miscfs/genfs/genfs.h> 78 79 MODULE(MODULE_CLASS_VFS, coda, NULL); 80 81 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 82 83 int codadebug = 0; 84 85 int coda_vfsop_print_entry = 0; 86 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 87 88 struct vnode *coda_ctlvp; 89 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 90 91 /* structure to keep statistics of internally generated/satisfied calls */ 92 93 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 94 95 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 96 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 97 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 98 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 99 100 extern const struct cdevsw vcoda_cdevsw; 101 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 102 103 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 104 &coda_vnodeop_opv_desc, 105 NULL, 106 }; 107 108 struct vfsops coda_vfsops = { 109 MOUNT_CODA, 110 256, /* This is the pathname, unlike every other fs */ 111 coda_mount, 112 coda_start, 113 coda_unmount, 114 coda_root, 115 (void *)eopnotsupp, /* vfs_quotactl */ 116 coda_nb_statvfs, 117 coda_sync, 118 coda_vget, 119 (void *)eopnotsupp, /* vfs_fhtovp */ 120 (void *)eopnotsupp, /* vfs_vptofh */ 121 coda_init, 122 NULL, /* vfs_reinit */ 123 coda_done, 124 (int (*)(void)) eopnotsupp, 125 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 126 vfs_stdextattrctl, 127 (void *)eopnotsupp, /* vfs_suspendctl */ 128 genfs_renamelock_enter, 129 genfs_renamelock_exit, 130 (void *)eopnotsupp, 131 coda_vnodeopv_descs, 132 0, /* vfs_refcount */ 133 { NULL, NULL }, /* vfs_list */ 134 }; 135 136 static int 137 coda_modcmd(modcmd_t cmd, void *arg) 138 { 139 140 switch (cmd) { 141 case MODULE_CMD_INIT: 142 return vfs_attach(&coda_vfsops); 143 case MODULE_CMD_FINI: 144 return vfs_detach(&coda_vfsops); 145 default: 146 return ENOTTY; 147 } 148 } 149 150 int 151 coda_vfsopstats_init(void) 152 { 153 int i; 154 155 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 156 coda_vfsopstats[i].opcode = i; 157 coda_vfsopstats[i].entries = 0; 158 coda_vfsopstats[i].sat_intrn = 0; 159 coda_vfsopstats[i].unsat_intrn = 0; 160 coda_vfsopstats[i].gen_intrn = 0; 161 } 162 163 return 0; 164 } 165 166 /* 167 * cfs mount vfsop 168 * Set up mount info record and attach it to vfs struct. 169 */ 170 /*ARGSUSED*/ 171 int 172 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */ 173 const char *path, /* path covered: ignored by the fs-layer */ 174 void *data, /* Need to define a data type for this in netbsd? */ 175 size_t *data_len) 176 { 177 struct lwp *l = curlwp; 178 struct nameidata nd; 179 struct vnode *dvp; 180 struct cnode *cp; 181 dev_t dev; 182 struct coda_mntinfo *mi; 183 struct vnode *rtvp; 184 const struct cdevsw *cdev; 185 CodaFid rootfid = INVAL_FID; 186 CodaFid ctlfid = CTL_FID; 187 int error; 188 189 if (vfsp->mnt_flag & MNT_GETARGS) 190 return EINVAL; 191 ENTRY; 192 193 coda_vfsopstats_init(); 194 coda_vnodeopstats_init(); 195 196 MARK_ENTRY(CODA_MOUNT_STATS); 197 if (CODA_MOUNTED(vfsp)) { 198 MARK_INT_FAIL(CODA_MOUNT_STATS); 199 return(EBUSY); 200 } 201 202 /* Validate mount device. Similar to getmdev(). */ 203 204 /* 205 * XXX: coda passes the mount device as the entire mount args, 206 * All other fs pass a structure contining a pointer. 207 * In order to get sys_mount() to do the copyin() we've set a 208 * fixed default size for the filename buffer. 209 */ 210 /* Ensure that namei() doesn't run off the filename buffer */ 211 ((char *)data)[*data_len - 1] = 0; 212 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, data); 213 error = namei(&nd); 214 dvp = nd.ni_vp; 215 216 if (error) { 217 MARK_INT_FAIL(CODA_MOUNT_STATS); 218 return (error); 219 } 220 if (dvp->v_type != VCHR) { 221 MARK_INT_FAIL(CODA_MOUNT_STATS); 222 vrele(dvp); 223 return(ENXIO); 224 } 225 dev = dvp->v_rdev; 226 vrele(dvp); 227 cdev = cdevsw_lookup(dev); 228 if (cdev == NULL) { 229 MARK_INT_FAIL(CODA_MOUNT_STATS); 230 return(ENXIO); 231 } 232 233 /* 234 * See if the device table matches our expectations. 235 */ 236 if (cdev != &vcoda_cdevsw) 237 { 238 MARK_INT_FAIL(CODA_MOUNT_STATS); 239 return(ENXIO); 240 } 241 242 if (minor(dev) >= NVCODA) { 243 MARK_INT_FAIL(CODA_MOUNT_STATS); 244 return(ENXIO); 245 } 246 247 /* 248 * Initialize the mount record and link it to the vfs struct 249 */ 250 mi = &coda_mnttbl[minor(dev)]; 251 252 if (!VC_OPEN(&mi->mi_vcomm)) { 253 MARK_INT_FAIL(CODA_MOUNT_STATS); 254 return(ENODEV); 255 } 256 257 /* No initialization (here) of mi_vcomm! */ 258 vfsp->mnt_data = mi; 259 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 260 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 261 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 262 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 263 mi->mi_vfsp = vfsp; 264 265 /* 266 * Make a root vnode to placate the Vnode interface, but don't 267 * actually make the CODA_ROOT call to venus until the first call 268 * to coda_root in case a server is down while venus is starting. 269 */ 270 cp = make_coda_node(&rootfid, vfsp, VDIR); 271 rtvp = CTOV(cp); 272 rtvp->v_vflag |= VV_ROOT; 273 274 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 275 The above code seems to cause a loop in the cnode links. 276 I don't totally understand when it happens, it is caught 277 when closing down the system. 278 */ 279 cp = make_coda_node(&ctlfid, 0, VCHR); 280 281 coda_ctlvp = CTOV(cp); 282 283 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 284 mi->mi_vfsp = vfsp; 285 mi->mi_rootvp = rtvp; 286 287 /* set filesystem block size */ 288 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 289 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 290 291 /* error is currently guaranteed to be zero, but in case some 292 code changes... */ 293 CODADEBUG(1, 294 myprintf(("coda_mount returned %d\n",error));); 295 if (error) 296 MARK_INT_FAIL(CODA_MOUNT_STATS); 297 else 298 MARK_INT_SAT(CODA_MOUNT_STATS); 299 300 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, 301 vfsp->mnt_op->vfs_name, vfsp, l); 302 } 303 304 int 305 coda_start(struct mount *vfsp, int flags) 306 { 307 ENTRY; 308 vftomi(vfsp)->mi_started = 1; 309 return (0); 310 } 311 312 int 313 coda_unmount(struct mount *vfsp, int mntflags) 314 { 315 struct coda_mntinfo *mi = vftomi(vfsp); 316 int active, error = 0; 317 318 ENTRY; 319 MARK_ENTRY(CODA_UMOUNT_STATS); 320 if (!CODA_MOUNTED(vfsp)) { 321 MARK_INT_FAIL(CODA_UMOUNT_STATS); 322 return(EINVAL); 323 } 324 325 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 326 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 327 return (EBUSY); /* Venus is still running */ 328 329 #ifdef DEBUG 330 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 331 #endif 332 mi->mi_started = 0; 333 334 vrele(mi->mi_rootvp); 335 336 active = coda_kill(vfsp, NOT_DOWNCALL); 337 mi->mi_rootvp->v_vflag &= ~VV_ROOT; 338 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 339 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 340 error = 0; 341 342 /* I'm going to take this out to allow lookups to go through. I'm 343 * not sure it's important anyway. -- DCS 2/2/94 344 */ 345 /* vfsp->VFS_DATA = NULL; */ 346 347 /* No more vfsp's to hold onto */ 348 mi->mi_vfsp = NULL; 349 mi->mi_rootvp = NULL; 350 351 if (error) 352 MARK_INT_FAIL(CODA_UMOUNT_STATS); 353 else 354 MARK_INT_SAT(CODA_UMOUNT_STATS); 355 356 return(error); 357 } 358 return (EINVAL); 359 } 360 361 /* 362 * find root of cfs 363 */ 364 int 365 coda_root(struct mount *vfsp, struct vnode **vpp) 366 { 367 struct coda_mntinfo *mi = vftomi(vfsp); 368 int error; 369 struct lwp *l = curlwp; /* XXX - bnoble */ 370 CodaFid VFid; 371 static const CodaFid invalfid = INVAL_FID; 372 373 ENTRY; 374 MARK_ENTRY(CODA_ROOT_STATS); 375 376 if (vfsp == mi->mi_vfsp) { 377 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 378 { /* Found valid root. */ 379 *vpp = mi->mi_rootvp; 380 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 381 vref(*vpp); 382 vn_lock(*vpp, LK_EXCLUSIVE); 383 MARK_INT_SAT(CODA_ROOT_STATS); 384 return(0); 385 } 386 } 387 388 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); 389 390 if (!error) { 391 /* 392 * Save the new rootfid in the cnode, and rehash the cnode into the 393 * cnode hash with the new fid key. 394 */ 395 coda_unsave(VTOC(mi->mi_rootvp)); 396 VTOC(mi->mi_rootvp)->c_fid = VFid; 397 coda_save(VTOC(mi->mi_rootvp)); 398 399 *vpp = mi->mi_rootvp; 400 vref(*vpp); 401 vn_lock(*vpp, LK_EXCLUSIVE); 402 MARK_INT_SAT(CODA_ROOT_STATS); 403 goto exit; 404 } else if (error == ENODEV || error == EINTR) { 405 /* Gross hack here! */ 406 /* 407 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 408 * ENODEV. Return the uninitialized root vnode to allow vfs 409 * operations such as unmount to continue. Without this hack, 410 * there is no way to do an unmount if Venus dies before a 411 * successful CODA_ROOT call is done. All vnode operations 412 * will fail. 413 */ 414 *vpp = mi->mi_rootvp; 415 vref(*vpp); 416 vn_lock(*vpp, LK_EXCLUSIVE); 417 MARK_INT_FAIL(CODA_ROOT_STATS); 418 error = 0; 419 goto exit; 420 } else { 421 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 422 MARK_INT_FAIL(CODA_ROOT_STATS); 423 424 goto exit; 425 } 426 exit: 427 return(error); 428 } 429 430 /* 431 * Get file system statistics. 432 */ 433 int 434 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) 435 { 436 struct lwp *l = curlwp; 437 struct coda_statfs fsstat; 438 int error; 439 440 ENTRY; 441 MARK_ENTRY(CODA_STATFS_STATS); 442 if (!CODA_MOUNTED(vfsp)) { 443 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 444 return(EINVAL); 445 } 446 447 /* XXX - what to do about f_flags, others? --bnoble */ 448 /* Below This is what AFS does 449 #define NB_SFS_SIZ 0x895440 450 */ 451 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 452 453 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); 454 455 if (!error) { 456 sbp->f_bsize = 8192; /* XXX */ 457 sbp->f_frsize = 8192; /* XXX */ 458 sbp->f_iosize = 8192; /* XXX */ 459 sbp->f_blocks = fsstat.f_blocks; 460 sbp->f_bfree = fsstat.f_bfree; 461 sbp->f_bavail = fsstat.f_bavail; 462 sbp->f_bresvd = 0; 463 sbp->f_files = fsstat.f_files; 464 sbp->f_ffree = fsstat.f_ffree; 465 sbp->f_favail = fsstat.f_ffree; 466 sbp->f_fresvd = 0; 467 copy_statvfs_info(sbp, vfsp); 468 } 469 470 MARK_INT_SAT(CODA_STATFS_STATS); 471 return(error); 472 } 473 474 /* 475 * Flush any pending I/O. 476 */ 477 int 478 coda_sync(struct mount *vfsp, int waitfor, 479 kauth_cred_t cred) 480 { 481 ENTRY; 482 MARK_ENTRY(CODA_SYNC_STATS); 483 MARK_INT_SAT(CODA_SYNC_STATS); 484 return(0); 485 } 486 487 int 488 coda_vget(struct mount *vfsp, ino_t ino, 489 struct vnode **vpp) 490 { 491 ENTRY; 492 return (EOPNOTSUPP); 493 } 494 495 /* 496 * fhtovp is now what vget used to be in 4.3-derived systems. For 497 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 498 * a type-specific fid. 499 */ 500 int 501 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 502 struct vnode **vpp, int *exflagsp, 503 kauth_cred_t *creadanonp) 504 { 505 struct cfid *cfid = (struct cfid *)fhp; 506 struct cnode *cp = 0; 507 int error; 508 struct lwp *l = curlwp; /* 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, l->l_cred, l->l_proc, &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(struct vnode *vnp, struct fid *fidp) 541 { 542 ENTRY; 543 return (EOPNOTSUPP); 544 } 545 546 void 547 coda_init(void) 548 { 549 ENTRY; 550 } 551 552 void 553 coda_done(void) 554 { 555 ENTRY; 556 } 557 558 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 559 { 560 sysctl_createv(clog, 0, NULL, NULL, 561 CTLFLAG_PERMANENT, 562 CTLTYPE_NODE, "vfs", NULL, 563 NULL, 0, NULL, 0, 564 CTL_VFS, CTL_EOL); 565 sysctl_createv(clog, 0, NULL, NULL, 566 CTLFLAG_PERMANENT, 567 CTLTYPE_NODE, "coda", 568 SYSCTL_DESCR("code vfs options"), 569 NULL, 0, NULL, 0, 570 CTL_VFS, 18, CTL_EOL); 571 /* 572 * XXX the "18" above could be dynamic, thereby eliminating 573 * one more instance of the "number to vfs" mapping problem, 574 * but "18" is the order as taken from sys/mount.h 575 */ 576 577 /* 578 sysctl_createv(clog, 0, NULL, NULL, 579 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 580 CTLTYPE_INT, "clusterread", 581 SYSCTL_DESCR( anyone? ), 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(struct vnode **vpp) 596 { 597 struct cfid cfid; 598 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 599 600 ENTRY; 601 602 cfid.cfid_len = (short)sizeof(CodaFid); 603 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 604 /* XXX ? */ 605 606 /* We're guessing that if set, the 1st element on the list is a 607 * valid vnode to use. If not, return ENODEV as venus is dead. 608 */ 609 if (mi->mi_vfsp == NULL) 610 return ENODEV; 611 612 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 613 NULL, NULL); 614 } 615 616 #include <ufs/ufs/quota.h> 617 #include <ufs/ufs/ufsmount.h> 618 /* get the mount structure corresponding to a given device. Assume 619 * device corresponds to a UFS. Return NULL if no device is found. 620 */ 621 struct mount *devtomp(dev_t dev) 622 { 623 struct mount *mp, *nmp; 624 625 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 626 nmp = mp->mnt_list.cqe_next; 627 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 628 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 629 /* mount corresponds to UFS and the device matches one we want */ 630 return(mp); 631 } 632 } 633 /* mount structure wasn't found */ 634 return(NULL); 635 } 636