coda_vfsops.c revision 1.84.2.2
1 /* $NetBSD: coda_vfsops.c,v 1.84.2.2 2017/03/20 06:57:23 pgoyette 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 1.84.2.2 2017/03/20 06:57:23 pgoyette 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 = genfs_suspendctl, 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_acquire(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 cdevsw_release(cdev); 228 return(ENXIO); 229 } 230 231 if (minor(dev) >= NVCODA) { 232 MARK_INT_FAIL(CODA_MOUNT_STATS); 233 cdevsw_release(cdev); 234 return(ENXIO); 235 } 236 237 /* 238 * Initialize the mount record and link it to the vfs struct 239 */ 240 mi = &coda_mnttbl[minor(dev)]; 241 242 if (!VC_OPEN(&mi->mi_vcomm)) { 243 MARK_INT_FAIL(CODA_MOUNT_STATS); 244 cdevsw_release(cdev); 245 return(ENODEV); 246 } 247 248 /* No initialization (here) of mi_vcomm! */ 249 vfsp->mnt_data = mi; 250 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 251 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 252 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 253 vfsp->mnt_stat.f_namemax = CODA_MAXNAMLEN; 254 mi->mi_vfsp = vfsp; 255 256 /* 257 * Make a root vnode to placate the Vnode interface, but don't 258 * actually make the CODA_ROOT call to venus until the first call 259 * to coda_root in case a server is down while venus is starting. 260 */ 261 cp = make_coda_node(&rootfid, vfsp, VDIR); 262 rtvp = CTOV(cp); 263 rtvp->v_vflag |= VV_ROOT; 264 265 cp = make_coda_node(&ctlfid, vfsp, VCHR); 266 267 coda_ctlvp = CTOV(cp); 268 269 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 270 mi->mi_vfsp = vfsp; 271 mi->mi_rootvp = rtvp; 272 273 /* set filesystem block size */ 274 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 275 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 276 277 /* error is currently guaranteed to be zero, but in case some 278 code changes... */ 279 CODADEBUG(1, 280 myprintf(("coda_mount returned %d\n",error));); 281 if (error) 282 MARK_INT_FAIL(CODA_MOUNT_STATS); 283 else 284 MARK_INT_SAT(CODA_MOUNT_STATS); 285 286 error = set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, 287 vfsp->mnt_op->vfs_name, vfsp, l); 288 cdevsw_release(cdev); 289 return error; 290 } 291 292 int 293 coda_start(struct mount *vfsp, int flags) 294 { 295 ENTRY; 296 vftomi(vfsp)->mi_started = 1; 297 return (0); 298 } 299 300 int 301 coda_unmount(struct mount *vfsp, int mntflags) 302 { 303 struct coda_mntinfo *mi = vftomi(vfsp); 304 int active, error = 0; 305 306 ENTRY; 307 MARK_ENTRY(CODA_UMOUNT_STATS); 308 if (!CODA_MOUNTED(vfsp)) { 309 MARK_INT_FAIL(CODA_UMOUNT_STATS); 310 return(EINVAL); 311 } 312 313 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 314 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 315 return (EBUSY); /* Venus is still running */ 316 317 #ifdef DEBUG 318 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 319 #endif 320 mi->mi_started = 0; 321 322 vrele(mi->mi_rootvp); 323 vrele(coda_ctlvp); 324 325 active = coda_kill(vfsp, NOT_DOWNCALL); 326 mi->mi_rootvp->v_vflag &= ~VV_ROOT; 327 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 328 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 329 error = 0; 330 331 /* I'm going to take this out to allow lookups to go through. I'm 332 * not sure it's important anyway. -- DCS 2/2/94 333 */ 334 /* vfsp->VFS_DATA = NULL; */ 335 336 /* No more vfsp's to hold onto */ 337 mi->mi_vfsp = NULL; 338 mi->mi_rootvp = NULL; 339 340 if (error) 341 MARK_INT_FAIL(CODA_UMOUNT_STATS); 342 else 343 MARK_INT_SAT(CODA_UMOUNT_STATS); 344 345 return(error); 346 } 347 return (EINVAL); 348 } 349 350 /* 351 * find root of cfs 352 */ 353 int 354 coda_root(struct mount *vfsp, struct vnode **vpp) 355 { 356 struct coda_mntinfo *mi = vftomi(vfsp); 357 int error; 358 struct lwp *l = curlwp; /* XXX - bnoble */ 359 CodaFid VFid; 360 static const CodaFid invalfid = INVAL_FID; 361 362 ENTRY; 363 MARK_ENTRY(CODA_ROOT_STATS); 364 365 if (vfsp == mi->mi_vfsp) { 366 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 367 { /* Found valid root. */ 368 *vpp = mi->mi_rootvp; 369 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 370 vref(*vpp); 371 vn_lock(*vpp, LK_EXCLUSIVE); 372 MARK_INT_SAT(CODA_ROOT_STATS); 373 return(0); 374 } 375 } 376 377 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); 378 379 if (!error) { 380 struct cnode *cp = VTOC(mi->mi_rootvp); 381 382 /* 383 * Save the new rootfid in the cnode, and rekey the cnode 384 * with the new fid key. 385 */ 386 error = vcache_rekey_enter(vfsp, mi->mi_rootvp, 387 &invalfid, sizeof(CodaFid), &VFid, sizeof(CodaFid)); 388 if (error) 389 goto exit; 390 cp->c_fid = VFid; 391 vcache_rekey_exit(vfsp, mi->mi_rootvp, 392 &invalfid, sizeof(CodaFid), &cp->c_fid, sizeof(CodaFid)); 393 394 *vpp = mi->mi_rootvp; 395 vref(*vpp); 396 vn_lock(*vpp, LK_EXCLUSIVE); 397 MARK_INT_SAT(CODA_ROOT_STATS); 398 goto exit; 399 } else if (error == ENODEV || error == EINTR) { 400 /* Gross hack here! */ 401 /* 402 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 403 * ENODEV. Return the uninitialized root vnode to allow vfs 404 * operations such as unmount to continue. Without this hack, 405 * there is no way to do an unmount if Venus dies before a 406 * successful CODA_ROOT call is done. All vnode operations 407 * will fail. 408 */ 409 *vpp = mi->mi_rootvp; 410 vref(*vpp); 411 vn_lock(*vpp, LK_EXCLUSIVE); 412 MARK_INT_FAIL(CODA_ROOT_STATS); 413 error = 0; 414 goto exit; 415 } else { 416 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 417 MARK_INT_FAIL(CODA_ROOT_STATS); 418 419 goto exit; 420 } 421 exit: 422 return(error); 423 } 424 425 /* 426 * Get file system statistics. 427 */ 428 int 429 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) 430 { 431 struct lwp *l = curlwp; 432 struct coda_statfs fsstat; 433 int error; 434 435 ENTRY; 436 MARK_ENTRY(CODA_STATFS_STATS); 437 if (!CODA_MOUNTED(vfsp)) { 438 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 439 return(EINVAL); 440 } 441 442 /* XXX - what to do about f_flags, others? --bnoble */ 443 /* Below This is what AFS does 444 #define NB_SFS_SIZ 0x895440 445 */ 446 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 447 448 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); 449 450 if (!error) { 451 sbp->f_bsize = 8192; /* XXX */ 452 sbp->f_frsize = 8192; /* XXX */ 453 sbp->f_iosize = 8192; /* XXX */ 454 sbp->f_blocks = fsstat.f_blocks; 455 sbp->f_bfree = fsstat.f_bfree; 456 sbp->f_bavail = fsstat.f_bavail; 457 sbp->f_bresvd = 0; 458 sbp->f_files = fsstat.f_files; 459 sbp->f_ffree = fsstat.f_ffree; 460 sbp->f_favail = fsstat.f_ffree; 461 sbp->f_fresvd = 0; 462 copy_statvfs_info(sbp, vfsp); 463 } 464 465 MARK_INT_SAT(CODA_STATFS_STATS); 466 return(error); 467 } 468 469 /* 470 * Flush any pending I/O. 471 */ 472 int 473 coda_sync(struct mount *vfsp, int waitfor, 474 kauth_cred_t cred) 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(struct mount *vfsp, ino_t ino, 484 struct vnode **vpp) 485 { 486 ENTRY; 487 return (EOPNOTSUPP); 488 } 489 490 int 491 coda_loadvnode(struct mount *mp, struct vnode *vp, 492 const void *key, size_t key_len, const void **new_key) 493 { 494 CodaFid fid; 495 struct cnode *cp; 496 extern int (**coda_vnodeop_p)(void *); 497 498 KASSERT(key_len == sizeof(CodaFid)); 499 memcpy(&fid, key, key_len); 500 501 cp = kmem_zalloc(sizeof(*cp), KM_SLEEP); 502 mutex_init(&cp->c_lock, MUTEX_DEFAULT, IPL_NONE); 503 cp->c_fid = fid; 504 cp->c_vnode = vp; 505 vp->v_op = coda_vnodeop_p; 506 vp->v_tag = VT_CODA; 507 vp->v_type = VNON; 508 vp->v_data = cp; 509 510 *new_key = &cp->c_fid; 511 512 return 0; 513 } 514 515 /* 516 * fhtovp is now what vget used to be in 4.3-derived systems. For 517 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 518 * a type-specific fid. 519 */ 520 int 521 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 522 struct vnode **vpp, int *exflagsp, 523 kauth_cred_t *creadanonp) 524 { 525 struct cfid *cfid = (struct cfid *)fhp; 526 struct cnode *cp = 0; 527 int error; 528 struct lwp *l = curlwp; /* XXX -mach */ 529 CodaFid VFid; 530 int vtype; 531 532 ENTRY; 533 534 MARK_ENTRY(CODA_VGET_STATS); 535 /* Check for vget of control object. */ 536 if (IS_CTL_FID(&cfid->cfid_fid)) { 537 *vpp = coda_ctlvp; 538 vref(coda_ctlvp); 539 MARK_INT_SAT(CODA_VGET_STATS); 540 return(0); 541 } 542 543 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype); 544 545 if (error) { 546 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 547 *vpp = (struct vnode *)0; 548 } else { 549 CODADEBUG(CODA_VGET, 550 myprintf(("vget: %s type %d result %d\n", 551 coda_f2s(&VFid), vtype, error)); ) 552 553 cp = make_coda_node(&VFid, vfsp, vtype); 554 *vpp = CTOV(cp); 555 } 556 return(error); 557 } 558 559 int 560 coda_vptofh(struct vnode *vnp, struct fid *fidp) 561 { 562 ENTRY; 563 return (EOPNOTSUPP); 564 } 565 566 void 567 coda_init(void) 568 { 569 ENTRY; 570 } 571 572 void 573 coda_done(void) 574 { 575 ENTRY; 576 } 577 578 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 579 { 580 581 sysctl_createv(clog, 0, NULL, NULL, 582 CTLFLAG_PERMANENT, 583 CTLTYPE_NODE, "coda", 584 SYSCTL_DESCR("code vfs options"), 585 NULL, 0, NULL, 0, 586 CTL_VFS, 18, CTL_EOL); 587 /* 588 * XXX the "18" above could be dynamic, thereby eliminating 589 * one more instance of the "number to vfs" mapping problem, 590 * but "18" is the order as taken from sys/mount.h 591 */ 592 593 /* 594 sysctl_createv(clog, 0, NULL, NULL, 595 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 596 CTLTYPE_INT, "clusterread", 597 SYSCTL_DESCR( anyone? ), 598 NULL, 0, &doclusterread, 0, 599 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 600 */ 601 } 602 603 /* 604 * To allow for greater ease of use, some vnodes may be orphaned when 605 * Venus dies. Certain operations should still be allowed to go 606 * through, but without propagating orphan-ness. So this function will 607 * get a new vnode for the file from the current run of Venus. 608 */ 609 610 int 611 getNewVnode(struct vnode **vpp) 612 { 613 struct cfid cfid; 614 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 615 616 ENTRY; 617 618 cfid.cfid_len = (short)sizeof(CodaFid); 619 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 620 /* XXX ? */ 621 622 /* We're guessing that if set, the 1st element on the list is a 623 * valid vnode to use. If not, return ENODEV as venus is dead. 624 */ 625 if (mi->mi_vfsp == NULL) 626 return ENODEV; 627 628 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 629 NULL, NULL); 630 } 631 632 #include <ufs/ufs/quota.h> 633 #include <ufs/ufs/ufsmount.h> 634 /* get the mount structure corresponding to a given device. Assume 635 * device corresponds to a UFS. Return NULL if no device is found. 636 */ 637 struct mount *devtomp(dev_t dev) 638 { 639 struct mount *mp; 640 641 mutex_enter(&mountlist_lock); 642 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 643 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 644 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 645 /* mount corresponds to UFS and the device matches one we want */ 646 break; 647 } 648 } 649 mutex_exit(&mountlist_lock); 650 return mp; 651 } 652
Indexes created Thu Oct 02 01:09:59 GMT 2025