coda_vfsops.c revision 1.66.8.1
1 /* $NetBSD: coda_vfsops.c,v 1.66.8.1 2014/04/25 15:43:49 sborrill 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 1.66.8.1 2014/04/25 15:43:49 sborrill 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 #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 (data == NULL) 190 return EINVAL; 191 if (vfsp->mnt_flag & MNT_GETARGS) 192 return EINVAL; 193 ENTRY; 194 195 coda_vfsopstats_init(); 196 coda_vnodeopstats_init(); 197 198 MARK_ENTRY(CODA_MOUNT_STATS); 199 if (CODA_MOUNTED(vfsp)) { 200 MARK_INT_FAIL(CODA_MOUNT_STATS); 201 return(EBUSY); 202 } 203 204 /* Validate mount device. Similar to getmdev(). */ 205 206 /* 207 * XXX: coda passes the mount device as the entire mount args, 208 * All other fs pass a structure contining a pointer. 209 * In order to get sys_mount() to do the copyin() we've set a 210 * fixed default size for the filename buffer. 211 */ 212 /* Ensure that namei() doesn't run off the filename buffer */ 213 ((char *)data)[*data_len - 1] = 0; 214 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, data); 215 error = namei(&nd); 216 dvp = nd.ni_vp; 217 218 if (error) { 219 MARK_INT_FAIL(CODA_MOUNT_STATS); 220 return (error); 221 } 222 if (dvp->v_type != VCHR) { 223 MARK_INT_FAIL(CODA_MOUNT_STATS); 224 vrele(dvp); 225 return(ENXIO); 226 } 227 dev = dvp->v_rdev; 228 vrele(dvp); 229 cdev = cdevsw_lookup(dev); 230 if (cdev == NULL) { 231 MARK_INT_FAIL(CODA_MOUNT_STATS); 232 return(ENXIO); 233 } 234 235 /* 236 * See if the device table matches our expectations. 237 */ 238 if (cdev != &vcoda_cdevsw) 239 { 240 MARK_INT_FAIL(CODA_MOUNT_STATS); 241 return(ENXIO); 242 } 243 244 if (minor(dev) >= NVCODA || minor(dev) < 0) { 245 MARK_INT_FAIL(CODA_MOUNT_STATS); 246 return(ENXIO); 247 } 248 249 /* 250 * Initialize the mount record and link it to the vfs struct 251 */ 252 mi = &coda_mnttbl[minor(dev)]; 253 254 if (!VC_OPEN(&mi->mi_vcomm)) { 255 MARK_INT_FAIL(CODA_MOUNT_STATS); 256 return(ENODEV); 257 } 258 259 /* No initialization (here) of mi_vcomm! */ 260 vfsp->mnt_data = mi; 261 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 262 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 263 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 264 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 265 mi->mi_vfsp = vfsp; 266 267 /* 268 * Make a root vnode to placate the Vnode interface, but don't 269 * actually make the CODA_ROOT call to venus until the first call 270 * to coda_root in case a server is down while venus is starting. 271 */ 272 cp = make_coda_node(&rootfid, vfsp, VDIR); 273 rtvp = CTOV(cp); 274 rtvp->v_vflag |= VV_ROOT; 275 276 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 277 The above code seems to cause a loop in the cnode links. 278 I don't totally understand when it happens, it is caught 279 when closing down the system. 280 */ 281 cp = make_coda_node(&ctlfid, 0, VCHR); 282 283 coda_ctlvp = CTOV(cp); 284 285 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 286 mi->mi_vfsp = vfsp; 287 mi->mi_rootvp = rtvp; 288 289 /* set filesystem block size */ 290 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 291 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 292 293 /* error is currently guaranteed to be zero, but in case some 294 code changes... */ 295 CODADEBUG(1, 296 myprintf(("coda_mount returned %d\n",error));); 297 if (error) 298 MARK_INT_FAIL(CODA_MOUNT_STATS); 299 else 300 MARK_INT_SAT(CODA_MOUNT_STATS); 301 302 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, 303 vfsp->mnt_op->vfs_name, vfsp, l); 304 } 305 306 int 307 coda_start(struct mount *vfsp, int flags) 308 { 309 ENTRY; 310 vftomi(vfsp)->mi_started = 1; 311 return (0); 312 } 313 314 int 315 coda_unmount(struct mount *vfsp, int mntflags) 316 { 317 struct coda_mntinfo *mi = vftomi(vfsp); 318 int active, error = 0; 319 320 ENTRY; 321 MARK_ENTRY(CODA_UMOUNT_STATS); 322 if (!CODA_MOUNTED(vfsp)) { 323 MARK_INT_FAIL(CODA_UMOUNT_STATS); 324 return(EINVAL); 325 } 326 327 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 328 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 329 return (EBUSY); /* Venus is still running */ 330 331 #ifdef DEBUG 332 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 333 #endif 334 mi->mi_started = 0; 335 336 vrele(mi->mi_rootvp); 337 338 active = coda_kill(vfsp, NOT_DOWNCALL); 339 mi->mi_rootvp->v_vflag &= ~VV_ROOT; 340 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 341 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 342 error = 0; 343 344 /* I'm going to take this out to allow lookups to go through. I'm 345 * not sure it's important anyway. -- DCS 2/2/94 346 */ 347 /* vfsp->VFS_DATA = NULL; */ 348 349 /* No more vfsp's to hold onto */ 350 mi->mi_vfsp = NULL; 351 mi->mi_rootvp = NULL; 352 353 if (error) 354 MARK_INT_FAIL(CODA_UMOUNT_STATS); 355 else 356 MARK_INT_SAT(CODA_UMOUNT_STATS); 357 358 return(error); 359 } 360 return (EINVAL); 361 } 362 363 /* 364 * find root of cfs 365 */ 366 int 367 coda_root(struct mount *vfsp, struct vnode **vpp) 368 { 369 struct coda_mntinfo *mi = vftomi(vfsp); 370 int error; 371 struct lwp *l = curlwp; /* XXX - bnoble */ 372 CodaFid VFid; 373 static const CodaFid invalfid = INVAL_FID; 374 375 ENTRY; 376 MARK_ENTRY(CODA_ROOT_STATS); 377 378 if (vfsp == mi->mi_vfsp) { 379 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 380 { /* Found valid root. */ 381 *vpp = mi->mi_rootvp; 382 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 383 vref(*vpp); 384 vn_lock(*vpp, LK_EXCLUSIVE); 385 MARK_INT_SAT(CODA_ROOT_STATS); 386 return(0); 387 } 388 } 389 390 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); 391 392 if (!error) { 393 /* 394 * Save the new rootfid in the cnode, and rehash the cnode into the 395 * cnode hash with the new fid key. 396 */ 397 coda_unsave(VTOC(mi->mi_rootvp)); 398 VTOC(mi->mi_rootvp)->c_fid = VFid; 399 coda_save(VTOC(mi->mi_rootvp)); 400 401 *vpp = mi->mi_rootvp; 402 vref(*vpp); 403 vn_lock(*vpp, LK_EXCLUSIVE); 404 MARK_INT_SAT(CODA_ROOT_STATS); 405 goto exit; 406 } else if (error == ENODEV || error == EINTR) { 407 /* Gross hack here! */ 408 /* 409 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 410 * ENODEV. Return the uninitialized root vnode to allow vfs 411 * operations such as unmount to continue. Without this hack, 412 * there is no way to do an unmount if Venus dies before a 413 * successful CODA_ROOT call is done. All vnode operations 414 * will fail. 415 */ 416 *vpp = mi->mi_rootvp; 417 vref(*vpp); 418 vn_lock(*vpp, LK_EXCLUSIVE); 419 MARK_INT_FAIL(CODA_ROOT_STATS); 420 error = 0; 421 goto exit; 422 } else { 423 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 424 MARK_INT_FAIL(CODA_ROOT_STATS); 425 426 goto exit; 427 } 428 exit: 429 return(error); 430 } 431 432 /* 433 * Get file system statistics. 434 */ 435 int 436 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) 437 { 438 struct lwp *l = curlwp; 439 struct coda_statfs fsstat; 440 int error; 441 442 ENTRY; 443 MARK_ENTRY(CODA_STATFS_STATS); 444 if (!CODA_MOUNTED(vfsp)) { 445 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 446 return(EINVAL); 447 } 448 449 /* XXX - what to do about f_flags, others? --bnoble */ 450 /* Below This is what AFS does 451 #define NB_SFS_SIZ 0x895440 452 */ 453 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 454 455 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); 456 457 if (!error) { 458 sbp->f_bsize = 8192; /* XXX */ 459 sbp->f_frsize = 8192; /* XXX */ 460 sbp->f_iosize = 8192; /* XXX */ 461 sbp->f_blocks = fsstat.f_blocks; 462 sbp->f_bfree = fsstat.f_bfree; 463 sbp->f_bavail = fsstat.f_bavail; 464 sbp->f_bresvd = 0; 465 sbp->f_files = fsstat.f_files; 466 sbp->f_ffree = fsstat.f_ffree; 467 sbp->f_favail = fsstat.f_ffree; 468 sbp->f_fresvd = 0; 469 copy_statvfs_info(sbp, vfsp); 470 } 471 472 MARK_INT_SAT(CODA_STATFS_STATS); 473 return(error); 474 } 475 476 /* 477 * Flush any pending I/O. 478 */ 479 int 480 coda_sync(struct mount *vfsp, int waitfor, 481 kauth_cred_t cred) 482 { 483 ENTRY; 484 MARK_ENTRY(CODA_SYNC_STATS); 485 MARK_INT_SAT(CODA_SYNC_STATS); 486 return(0); 487 } 488 489 int 490 coda_vget(struct mount *vfsp, ino_t ino, 491 struct vnode **vpp) 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(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 504 struct vnode **vpp, int *exflagsp, 505 kauth_cred_t *creadanonp) 506 { 507 struct cfid *cfid = (struct cfid *)fhp; 508 struct cnode *cp = 0; 509 int error; 510 struct lwp *l = curlwp; /* XXX -mach */ 511 CodaFid VFid; 512 int vtype; 513 514 ENTRY; 515 516 MARK_ENTRY(CODA_VGET_STATS); 517 /* Check for vget of control object. */ 518 if (IS_CTL_FID(&cfid->cfid_fid)) { 519 *vpp = coda_ctlvp; 520 vref(coda_ctlvp); 521 MARK_INT_SAT(CODA_VGET_STATS); 522 return(0); 523 } 524 525 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype); 526 527 if (error) { 528 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 529 *vpp = (struct vnode *)0; 530 } else { 531 CODADEBUG(CODA_VGET, 532 myprintf(("vget: %s type %d result %d\n", 533 coda_f2s(&VFid), vtype, error)); ) 534 535 cp = make_coda_node(&VFid, vfsp, vtype); 536 *vpp = CTOV(cp); 537 } 538 return(error); 539 } 540 541 int 542 coda_vptofh(struct vnode *vnp, 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", 570 SYSCTL_DESCR("code vfs options"), 571 NULL, 0, NULL, 0, 572 CTL_VFS, 18, CTL_EOL); 573 /* 574 * XXX the "18" above could be dynamic, thereby eliminating 575 * one more instance of the "number to vfs" mapping problem, 576 * but "18" is the order as taken from sys/mount.h 577 */ 578 579 /* 580 sysctl_createv(clog, 0, NULL, NULL, 581 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 582 CTLTYPE_INT, "clusterread", 583 SYSCTL_DESCR( anyone? ), 584 NULL, 0, &doclusterread, 0, 585 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 586 */ 587 } 588 589 /* 590 * To allow for greater ease of use, some vnodes may be orphaned when 591 * Venus dies. Certain operations should still be allowed to go 592 * through, but without propagating orphan-ness. So this function will 593 * get a new vnode for the file from the current run of Venus. 594 */ 595 596 int 597 getNewVnode(struct vnode **vpp) 598 { 599 struct cfid cfid; 600 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 601 602 ENTRY; 603 604 cfid.cfid_len = (short)sizeof(CodaFid); 605 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 606 /* XXX ? */ 607 608 /* We're guessing that if set, the 1st element on the list is a 609 * valid vnode to use. If not, return ENODEV as venus is dead. 610 */ 611 if (mi->mi_vfsp == NULL) 612 return ENODEV; 613 614 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 615 NULL, NULL); 616 } 617 618 #include <ufs/ufs/quota.h> 619 #include <ufs/ufs/ufsmount.h> 620 /* get the mount structure corresponding to a given device. Assume 621 * device corresponds to a UFS. Return NULL if no device is found. 622 */ 623 struct mount *devtomp(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 Wed Oct 01 19:09:53 GMT 2025