coda_vfsops.c revision 1.84
1 /* $NetBSD: coda_vfsops.c,v 1.84 2014/12/13 15:59:30 hannken 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 1.84 2014/12/13 15:59:30 hannken Exp $"); 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/sysctl.h> 53 #include <sys/malloc.h> 54 #include <sys/conf.h> 55 #include <sys/namei.h> 56 #include <sys/dirent.h> 57 #include <sys/mount.h> 58 #include <sys/proc.h> 59 #include <sys/select.h> 60 #include <sys/kauth.h> 61 #include <sys/module.h> 62 63 #include <coda/coda.h> 64 #include <coda/cnode.h> 65 #include <coda/coda_vfsops.h> 66 #include <coda/coda_venus.h> 67 #include <coda/coda_subr.h> 68 #include <coda/coda_opstats.h> 69 /* for VN_RDEV */ 70 #include <miscfs/specfs/specdev.h> 71 #include <miscfs/genfs/genfs.h> 72 73 MODULE(MODULE_CLASS_VFS, coda, "vcoda"); 74 75 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 76 77 extern struct vnode *coda_ctlvp; 78 extern struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 79 80 /* structure to keep statistics of internally generated/satisfied calls */ 81 82 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 83 84 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 85 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 86 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 87 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 88 89 extern const struct cdevsw vcoda_cdevsw; 90 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 91 92 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 93 &coda_vnodeop_opv_desc, 94 NULL, 95 }; 96 97 struct vfsops coda_vfsops = { 98 .vfs_name = MOUNT_CODA, 99 .vfs_min_mount_data = 256, 100 /* This is the pathname, unlike every other fs */ 101 .vfs_mount = coda_mount, 102 .vfs_start = coda_start, 103 .vfs_unmount = coda_unmount, 104 .vfs_root = coda_root, 105 .vfs_quotactl = (void *)eopnotsupp, 106 .vfs_statvfs = coda_nb_statvfs, 107 .vfs_sync = coda_sync, 108 .vfs_vget = coda_vget, 109 .vfs_loadvnode = coda_loadvnode, 110 .vfs_fhtovp = (void *)eopnotsupp, 111 .vfs_vptofh = (void *)eopnotsupp, 112 .vfs_init = coda_init, 113 .vfs_done = coda_done, 114 .vfs_mountroot = (void *)eopnotsupp, 115 .vfs_snapshot = (void *)eopnotsupp, 116 .vfs_extattrctl = vfs_stdextattrctl, 117 .vfs_suspendctl = (void *)eopnotsupp, 118 .vfs_renamelock_enter = genfs_renamelock_enter, 119 .vfs_renamelock_exit = genfs_renamelock_exit, 120 .vfs_fsync = (void *)eopnotsupp, 121 .vfs_opv_descs = coda_vnodeopv_descs 122 }; 123 124 static int 125 coda_modcmd(modcmd_t cmd, void *arg) 126 { 127 128 switch (cmd) { 129 case MODULE_CMD_INIT: 130 return vfs_attach(&coda_vfsops); 131 case MODULE_CMD_FINI: 132 return vfs_detach(&coda_vfsops); 133 default: 134 return ENOTTY; 135 } 136 } 137 138 int 139 coda_vfsopstats_init(void) 140 { 141 int i; 142 143 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 144 coda_vfsopstats[i].opcode = i; 145 coda_vfsopstats[i].entries = 0; 146 coda_vfsopstats[i].sat_intrn = 0; 147 coda_vfsopstats[i].unsat_intrn = 0; 148 coda_vfsopstats[i].gen_intrn = 0; 149 } 150 151 return 0; 152 } 153 154 /* 155 * cfs mount vfsop 156 * Set up mount info record and attach it to vfs struct. 157 */ 158 /*ARGSUSED*/ 159 int 160 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */ 161 const char *path, /* path covered: ignored by the fs-layer */ 162 void *data, /* Need to define a data type for this in netbsd? */ 163 size_t *data_len) 164 { 165 struct lwp *l = curlwp; 166 struct vnode *dvp; 167 struct cnode *cp; 168 dev_t dev; 169 struct coda_mntinfo *mi; 170 struct vnode *rtvp; 171 const struct cdevsw *cdev; 172 CodaFid rootfid = INVAL_FID; 173 CodaFid ctlfid = CTL_FID; 174 int error; 175 176 if (data == NULL) 177 return EINVAL; 178 if (vfsp->mnt_flag & MNT_GETARGS) 179 return EINVAL; 180 ENTRY; 181 182 coda_vfsopstats_init(); 183 coda_vnodeopstats_init(); 184 185 MARK_ENTRY(CODA_MOUNT_STATS); 186 if (CODA_MOUNTED(vfsp)) { 187 MARK_INT_FAIL(CODA_MOUNT_STATS); 188 return(EBUSY); 189 } 190 191 /* Validate mount device. Similar to getmdev(). */ 192 193 /* 194 * XXX: coda passes the mount device as the entire mount args, 195 * All other fs pass a structure contining a pointer. 196 * In order to get sys_mount() to do the copyin() we've set a 197 * fixed default size for the filename buffer. 198 */ 199 /* Ensure that namei() doesn't run off the filename buffer */ 200 ((char *)data)[*data_len - 1] = 0; 201 error = namei_simple_kernel((char *)data, NSM_FOLLOW_NOEMULROOT, 202 &dvp); 203 204 if (error) { 205 MARK_INT_FAIL(CODA_MOUNT_STATS); 206 return (error); 207 } 208 if (dvp->v_type != VCHR) { 209 MARK_INT_FAIL(CODA_MOUNT_STATS); 210 vrele(dvp); 211 return(ENXIO); 212 } 213 dev = dvp->v_rdev; 214 vrele(dvp); 215 cdev = cdevsw_lookup(dev); 216 if (cdev == NULL) { 217 MARK_INT_FAIL(CODA_MOUNT_STATS); 218 return(ENXIO); 219 } 220 221 /* 222 * See if the device table matches our expectations. 223 */ 224 if (cdev != &vcoda_cdevsw) 225 { 226 MARK_INT_FAIL(CODA_MOUNT_STATS); 227 return(ENXIO); 228 } 229 230 if (minor(dev) >= NVCODA) { 231 MARK_INT_FAIL(CODA_MOUNT_STATS); 232 return(ENXIO); 233 } 234 235 /* 236 * Initialize the mount record and link it to the vfs struct 237 */ 238 mi = &coda_mnttbl[minor(dev)]; 239 240 if (!VC_OPEN(&mi->mi_vcomm)) { 241 MARK_INT_FAIL(CODA_MOUNT_STATS); 242 return(ENODEV); 243 } 244 245 /* No initialization (here) of mi_vcomm! */ 246 vfsp->mnt_data = mi; 247 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 248 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 249 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 250 vfsp->mnt_stat.f_namemax = CODA_MAXNAMLEN; 251 mi->mi_vfsp = vfsp; 252 253 /* 254 * Make a root vnode to placate the Vnode interface, but don't 255 * actually make the CODA_ROOT call to venus until the first call 256 * to coda_root in case a server is down while venus is starting. 257 */ 258 cp = make_coda_node(&rootfid, vfsp, VDIR); 259 rtvp = CTOV(cp); 260 rtvp->v_vflag |= VV_ROOT; 261 262 cp = make_coda_node(&ctlfid, vfsp, VCHR); 263 264 coda_ctlvp = CTOV(cp); 265 266 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 267 mi->mi_vfsp = vfsp; 268 mi->mi_rootvp = rtvp; 269 270 /* set filesystem block size */ 271 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 272 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 273 274 /* error is currently guaranteed to be zero, but in case some 275 code changes... */ 276 CODADEBUG(1, 277 myprintf(("coda_mount returned %d\n",error));); 278 if (error) 279 MARK_INT_FAIL(CODA_MOUNT_STATS); 280 else 281 MARK_INT_SAT(CODA_MOUNT_STATS); 282 283 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, 284 vfsp->mnt_op->vfs_name, vfsp, l); 285 } 286 287 int 288 coda_start(struct mount *vfsp, int flags) 289 { 290 ENTRY; 291 vftomi(vfsp)->mi_started = 1; 292 return (0); 293 } 294 295 int 296 coda_unmount(struct mount *vfsp, int mntflags) 297 { 298 struct coda_mntinfo *mi = vftomi(vfsp); 299 int active, error = 0; 300 301 ENTRY; 302 MARK_ENTRY(CODA_UMOUNT_STATS); 303 if (!CODA_MOUNTED(vfsp)) { 304 MARK_INT_FAIL(CODA_UMOUNT_STATS); 305 return(EINVAL); 306 } 307 308 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 309 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 310 return (EBUSY); /* Venus is still running */ 311 312 #ifdef DEBUG 313 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 314 #endif 315 mi->mi_started = 0; 316 317 vrele(mi->mi_rootvp); 318 vrele(coda_ctlvp); 319 320 active = coda_kill(vfsp, NOT_DOWNCALL); 321 mi->mi_rootvp->v_vflag &= ~VV_ROOT; 322 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 323 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 324 error = 0; 325 326 /* I'm going to take this out to allow lookups to go through. I'm 327 * not sure it's important anyway. -- DCS 2/2/94 328 */ 329 /* vfsp->VFS_DATA = NULL; */ 330 331 /* No more vfsp's to hold onto */ 332 mi->mi_vfsp = NULL; 333 mi->mi_rootvp = NULL; 334 335 if (error) 336 MARK_INT_FAIL(CODA_UMOUNT_STATS); 337 else 338 MARK_INT_SAT(CODA_UMOUNT_STATS); 339 340 return(error); 341 } 342 return (EINVAL); 343 } 344 345 /* 346 * find root of cfs 347 */ 348 int 349 coda_root(struct mount *vfsp, struct vnode **vpp) 350 { 351 struct coda_mntinfo *mi = vftomi(vfsp); 352 int error; 353 struct lwp *l = curlwp; /* XXX - bnoble */ 354 CodaFid VFid; 355 static const CodaFid invalfid = INVAL_FID; 356 357 ENTRY; 358 MARK_ENTRY(CODA_ROOT_STATS); 359 360 if (vfsp == mi->mi_vfsp) { 361 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 362 { /* Found valid root. */ 363 *vpp = mi->mi_rootvp; 364 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 365 vref(*vpp); 366 vn_lock(*vpp, LK_EXCLUSIVE); 367 MARK_INT_SAT(CODA_ROOT_STATS); 368 return(0); 369 } 370 } 371 372 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); 373 374 if (!error) { 375 struct cnode *cp = VTOC(mi->mi_rootvp); 376 377 /* 378 * Save the new rootfid in the cnode, and rekey the cnode 379 * with the new fid key. 380 */ 381 error = vcache_rekey_enter(vfsp, mi->mi_rootvp, 382 &invalfid, sizeof(CodaFid), &VFid, sizeof(CodaFid)); 383 if (error) 384 goto exit; 385 cp->c_fid = VFid; 386 vcache_rekey_exit(vfsp, mi->mi_rootvp, 387 &invalfid, sizeof(CodaFid), &cp->c_fid, sizeof(CodaFid)); 388 389 *vpp = mi->mi_rootvp; 390 vref(*vpp); 391 vn_lock(*vpp, LK_EXCLUSIVE); 392 MARK_INT_SAT(CODA_ROOT_STATS); 393 goto exit; 394 } else if (error == ENODEV || error == EINTR) { 395 /* Gross hack here! */ 396 /* 397 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 398 * ENODEV. Return the uninitialized root vnode to allow vfs 399 * operations such as unmount to continue. Without this hack, 400 * there is no way to do an unmount if Venus dies before a 401 * successful CODA_ROOT call is done. All vnode operations 402 * will fail. 403 */ 404 *vpp = mi->mi_rootvp; 405 vref(*vpp); 406 vn_lock(*vpp, LK_EXCLUSIVE); 407 MARK_INT_FAIL(CODA_ROOT_STATS); 408 error = 0; 409 goto exit; 410 } else { 411 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 412 MARK_INT_FAIL(CODA_ROOT_STATS); 413 414 goto exit; 415 } 416 exit: 417 return(error); 418 } 419 420 /* 421 * Get file system statistics. 422 */ 423 int 424 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) 425 { 426 struct lwp *l = curlwp; 427 struct coda_statfs fsstat; 428 int error; 429 430 ENTRY; 431 MARK_ENTRY(CODA_STATFS_STATS); 432 if (!CODA_MOUNTED(vfsp)) { 433 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 434 return(EINVAL); 435 } 436 437 /* XXX - what to do about f_flags, others? --bnoble */ 438 /* Below This is what AFS does 439 #define NB_SFS_SIZ 0x895440 440 */ 441 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 442 443 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); 444 445 if (!error) { 446 sbp->f_bsize = 8192; /* XXX */ 447 sbp->f_frsize = 8192; /* XXX */ 448 sbp->f_iosize = 8192; /* XXX */ 449 sbp->f_blocks = fsstat.f_blocks; 450 sbp->f_bfree = fsstat.f_bfree; 451 sbp->f_bavail = fsstat.f_bavail; 452 sbp->f_bresvd = 0; 453 sbp->f_files = fsstat.f_files; 454 sbp->f_ffree = fsstat.f_ffree; 455 sbp->f_favail = fsstat.f_ffree; 456 sbp->f_fresvd = 0; 457 copy_statvfs_info(sbp, vfsp); 458 } 459 460 MARK_INT_SAT(CODA_STATFS_STATS); 461 return(error); 462 } 463 464 /* 465 * Flush any pending I/O. 466 */ 467 int 468 coda_sync(struct mount *vfsp, int waitfor, 469 kauth_cred_t cred) 470 { 471 ENTRY; 472 MARK_ENTRY(CODA_SYNC_STATS); 473 MARK_INT_SAT(CODA_SYNC_STATS); 474 return(0); 475 } 476 477 int 478 coda_vget(struct mount *vfsp, ino_t ino, 479 struct vnode **vpp) 480 { 481 ENTRY; 482 return (EOPNOTSUPP); 483 } 484 485 int 486 coda_loadvnode(struct mount *mp, struct vnode *vp, 487 const void *key, size_t key_len, const void **new_key) 488 { 489 CodaFid fid; 490 struct cnode *cp; 491 extern int (**coda_vnodeop_p)(void *); 492 493 KASSERT(key_len == sizeof(CodaFid)); 494 memcpy(&fid, key, key_len); 495 496 cp = kmem_zalloc(sizeof(*cp), KM_SLEEP); 497 mutex_init(&cp->c_lock, MUTEX_DEFAULT, IPL_NONE); 498 cp->c_fid = fid; 499 cp->c_vnode = vp; 500 vp->v_op = coda_vnodeop_p; 501 vp->v_tag = VT_CODA; 502 vp->v_type = VNON; 503 vp->v_data = cp; 504 505 *new_key = &cp->c_fid; 506 507 return 0; 508 } 509 510 /* 511 * fhtovp is now what vget used to be in 4.3-derived systems. For 512 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 513 * a type-specific fid. 514 */ 515 int 516 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 517 struct vnode **vpp, int *exflagsp, 518 kauth_cred_t *creadanonp) 519 { 520 struct cfid *cfid = (struct cfid *)fhp; 521 struct cnode *cp = 0; 522 int error; 523 struct lwp *l = curlwp; /* XXX -mach */ 524 CodaFid VFid; 525 int vtype; 526 527 ENTRY; 528 529 MARK_ENTRY(CODA_VGET_STATS); 530 /* Check for vget of control object. */ 531 if (IS_CTL_FID(&cfid->cfid_fid)) { 532 *vpp = coda_ctlvp; 533 vref(coda_ctlvp); 534 MARK_INT_SAT(CODA_VGET_STATS); 535 return(0); 536 } 537 538 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype); 539 540 if (error) { 541 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 542 *vpp = (struct vnode *)0; 543 } else { 544 CODADEBUG(CODA_VGET, 545 myprintf(("vget: %s type %d result %d\n", 546 coda_f2s(&VFid), vtype, error)); ) 547 548 cp = make_coda_node(&VFid, vfsp, vtype); 549 *vpp = CTOV(cp); 550 } 551 return(error); 552 } 553 554 int 555 coda_vptofh(struct vnode *vnp, struct fid *fidp) 556 { 557 ENTRY; 558 return (EOPNOTSUPP); 559 } 560 561 void 562 coda_init(void) 563 { 564 ENTRY; 565 } 566 567 void 568 coda_done(void) 569 { 570 ENTRY; 571 } 572 573 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 574 { 575 576 sysctl_createv(clog, 0, NULL, NULL, 577 CTLFLAG_PERMANENT, 578 CTLTYPE_NODE, "coda", 579 SYSCTL_DESCR("code vfs options"), 580 NULL, 0, NULL, 0, 581 CTL_VFS, 18, CTL_EOL); 582 /* 583 * XXX the "18" above could be dynamic, thereby eliminating 584 * one more instance of the "number to vfs" mapping problem, 585 * but "18" is the order as taken from sys/mount.h 586 */ 587 588 /* 589 sysctl_createv(clog, 0, NULL, NULL, 590 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 591 CTLTYPE_INT, "clusterread", 592 SYSCTL_DESCR( anyone? ), 593 NULL, 0, &doclusterread, 0, 594 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 595 */ 596 } 597 598 /* 599 * To allow for greater ease of use, some vnodes may be orphaned when 600 * Venus dies. Certain operations should still be allowed to go 601 * through, but without propagating orphan-ness. So this function will 602 * get a new vnode for the file from the current run of Venus. 603 */ 604 605 int 606 getNewVnode(struct vnode **vpp) 607 { 608 struct cfid cfid; 609 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 610 611 ENTRY; 612 613 cfid.cfid_len = (short)sizeof(CodaFid); 614 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 615 /* XXX ? */ 616 617 /* We're guessing that if set, the 1st element on the list is a 618 * valid vnode to use. If not, return ENODEV as venus is dead. 619 */ 620 if (mi->mi_vfsp == NULL) 621 return ENODEV; 622 623 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 624 NULL, NULL); 625 } 626 627 #include <ufs/ufs/quota.h> 628 #include <ufs/ufs/ufsmount.h> 629 /* get the mount structure corresponding to a given device. Assume 630 * device corresponds to a UFS. Return NULL if no device is found. 631 */ 632 struct mount *devtomp(dev_t dev) 633 { 634 struct mount *mp; 635 636 mutex_enter(&mountlist_lock); 637 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 638 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 639 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 640 /* mount corresponds to UFS and the device matches one we want */ 641 break; 642 } 643 } 644 mutex_exit(&mountlist_lock); 645 return mp; 646 } 647
Indexes created Sat Sep 27 14:09:57 GMT 2025