1 /* $NetBSD: coda_vfsops.c,v 1.81 2014/04/16 18:55:17 maxv 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 1.81 2014/04/16 18:55:17 maxv 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, "vcoda"); 80 81 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 82 83 extern struct vnode *coda_ctlvp; 84 extern 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 .vfs_name = MOUNT_CODA, 105 .vfs_min_mount_data = 256, 106 /* This is the pathname, unlike every other fs */ 107 .vfs_mount = coda_mount, 108 .vfs_start = coda_start, 109 .vfs_unmount = coda_unmount, 110 .vfs_root = coda_root, 111 .vfs_quotactl = (void *)eopnotsupp, 112 .vfs_statvfs = coda_nb_statvfs, 113 .vfs_sync = coda_sync, 114 .vfs_vget = coda_vget, 115 .vfs_fhtovp = (void *)eopnotsupp, 116 .vfs_vptofh = (void *)eopnotsupp, 117 .vfs_init = coda_init, 118 .vfs_done = coda_done, 119 .vfs_mountroot = (void *)eopnotsupp, 120 .vfs_snapshot = (void *)eopnotsupp, 121 .vfs_extattrctl = vfs_stdextattrctl, 122 .vfs_suspendctl = (void *)eopnotsupp, 123 .vfs_renamelock_enter = genfs_renamelock_enter, 124 .vfs_renamelock_exit = genfs_renamelock_exit, 125 .vfs_fsync = (void *)eopnotsupp, 126 .vfs_opv_descs = coda_vnodeopv_descs 127 }; 128 129 static int 130 coda_modcmd(modcmd_t cmd, void *arg) 131 { 132 133 switch (cmd) { 134 case MODULE_CMD_INIT: 135 return vfs_attach(&coda_vfsops); 136 case MODULE_CMD_FINI: 137 return vfs_detach(&coda_vfsops); 138 default: 139 return ENOTTY; 140 } 141 } 142 143 int 144 coda_vfsopstats_init(void) 145 { 146 int i; 147 148 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 149 coda_vfsopstats[i].opcode = i; 150 coda_vfsopstats[i].entries = 0; 151 coda_vfsopstats[i].sat_intrn = 0; 152 coda_vfsopstats[i].unsat_intrn = 0; 153 coda_vfsopstats[i].gen_intrn = 0; 154 } 155 156 return 0; 157 } 158 159 /* 160 * cfs mount vfsop 161 * Set up mount info record and attach it to vfs struct. 162 */ 163 /*ARGSUSED*/ 164 int 165 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */ 166 const char *path, /* path covered: ignored by the fs-layer */ 167 void *data, /* Need to define a data type for this in netbsd? */ 168 size_t *data_len) 169 { 170 struct lwp *l = curlwp; 171 struct vnode *dvp; 172 struct cnode *cp; 173 dev_t dev; 174 struct coda_mntinfo *mi; 175 struct vnode *rtvp; 176 const struct cdevsw *cdev; 177 CodaFid rootfid = INVAL_FID; 178 CodaFid ctlfid = CTL_FID; 179 int error; 180 181 if (data == NULL) 182 return EINVAL; 183 if (vfsp->mnt_flag & MNT_GETARGS) 184 return EINVAL; 185 ENTRY; 186 187 coda_vfsopstats_init(); 188 coda_vnodeopstats_init(); 189 190 MARK_ENTRY(CODA_MOUNT_STATS); 191 if (CODA_MOUNTED(vfsp)) { 192 MARK_INT_FAIL(CODA_MOUNT_STATS); 193 return(EBUSY); 194 } 195 196 /* Validate mount device. Similar to getmdev(). */ 197 198 /* 199 * XXX: coda passes the mount device as the entire mount args, 200 * All other fs pass a structure contining a pointer. 201 * In order to get sys_mount() to do the copyin() we've set a 202 * fixed default size for the filename buffer. 203 */ 204 /* Ensure that namei() doesn't run off the filename buffer */ 205 ((char *)data)[*data_len - 1] = 0; 206 error = namei_simple_kernel((char *)data, NSM_FOLLOW_NOEMULROOT, 207 &dvp); 208 209 if (error) { 210 MARK_INT_FAIL(CODA_MOUNT_STATS); 211 return (error); 212 } 213 if (dvp->v_type != VCHR) { 214 MARK_INT_FAIL(CODA_MOUNT_STATS); 215 vrele(dvp); 216 return(ENXIO); 217 } 218 dev = dvp->v_rdev; 219 vrele(dvp); 220 cdev = cdevsw_lookup(dev); 221 if (cdev == NULL) { 222 MARK_INT_FAIL(CODA_MOUNT_STATS); 223 return(ENXIO); 224 } 225 226 /* 227 * See if the device table matches our expectations. 228 */ 229 if (cdev != &vcoda_cdevsw) 230 { 231 MARK_INT_FAIL(CODA_MOUNT_STATS); 232 return(ENXIO); 233 } 234 235 if (minor(dev) >= NVCODA) { 236 MARK_INT_FAIL(CODA_MOUNT_STATS); 237 return(ENXIO); 238 } 239 240 /* 241 * Initialize the mount record and link it to the vfs struct 242 */ 243 mi = &coda_mnttbl[minor(dev)]; 244 245 if (!VC_OPEN(&mi->mi_vcomm)) { 246 MARK_INT_FAIL(CODA_MOUNT_STATS); 247 return(ENODEV); 248 } 249 250 /* No initialization (here) of mi_vcomm! */ 251 vfsp->mnt_data = mi; 252 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 253 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 254 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 255 vfsp->mnt_stat.f_namemax = CODA_MAXNAMLEN; 256 mi->mi_vfsp = vfsp; 257 258 /* 259 * Make a root vnode to placate the Vnode interface, but don't 260 * actually make the CODA_ROOT call to venus until the first call 261 * to coda_root in case a server is down while venus is starting. 262 */ 263 cp = make_coda_node(&rootfid, vfsp, VDIR); 264 rtvp = CTOV(cp); 265 rtvp->v_vflag |= VV_ROOT; 266 267 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 268 The above code seems to cause a loop in the cnode links. 269 I don't totally understand when it happens, it is caught 270 when closing down the system. 271 */ 272 cp = make_coda_node(&ctlfid, 0, VCHR); 273 274 coda_ctlvp = CTOV(cp); 275 276 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 277 mi->mi_vfsp = vfsp; 278 mi->mi_rootvp = rtvp; 279 280 /* set filesystem block size */ 281 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 282 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 283 284 /* error is currently guaranteed to be zero, but in case some 285 code changes... */ 286 CODADEBUG(1, 287 myprintf(("coda_mount returned %d\n",error));); 288 if (error) 289 MARK_INT_FAIL(CODA_MOUNT_STATS); 290 else 291 MARK_INT_SAT(CODA_MOUNT_STATS); 292 293 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, 294 vfsp->mnt_op->vfs_name, vfsp, l); 295 } 296 297 int 298 coda_start(struct mount *vfsp, int flags) 299 { 300 ENTRY; 301 vftomi(vfsp)->mi_started = 1; 302 return (0); 303 } 304 305 int 306 coda_unmount(struct mount *vfsp, int mntflags) 307 { 308 struct coda_mntinfo *mi = vftomi(vfsp); 309 int active, error = 0; 310 311 ENTRY; 312 MARK_ENTRY(CODA_UMOUNT_STATS); 313 if (!CODA_MOUNTED(vfsp)) { 314 MARK_INT_FAIL(CODA_UMOUNT_STATS); 315 return(EINVAL); 316 } 317 318 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 319 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 320 return (EBUSY); /* Venus is still running */ 321 322 #ifdef DEBUG 323 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 324 #endif 325 mi->mi_started = 0; 326 327 vrele(mi->mi_rootvp); 328 329 active = coda_kill(vfsp, NOT_DOWNCALL); 330 mi->mi_rootvp->v_vflag &= ~VV_ROOT; 331 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 332 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 333 error = 0; 334 335 /* I'm going to take this out to allow lookups to go through. I'm 336 * not sure it's important anyway. -- DCS 2/2/94 337 */ 338 /* vfsp->VFS_DATA = NULL; */ 339 340 /* No more vfsp's to hold onto */ 341 mi->mi_vfsp = NULL; 342 mi->mi_rootvp = NULL; 343 344 if (error) 345 MARK_INT_FAIL(CODA_UMOUNT_STATS); 346 else 347 MARK_INT_SAT(CODA_UMOUNT_STATS); 348 349 return(error); 350 } 351 return (EINVAL); 352 } 353 354 /* 355 * find root of cfs 356 */ 357 int 358 coda_root(struct mount *vfsp, struct vnode **vpp) 359 { 360 struct coda_mntinfo *mi = vftomi(vfsp); 361 int error; 362 struct lwp *l = curlwp; /* XXX - bnoble */ 363 CodaFid VFid; 364 static const CodaFid invalfid = INVAL_FID; 365 366 ENTRY; 367 MARK_ENTRY(CODA_ROOT_STATS); 368 369 if (vfsp == mi->mi_vfsp) { 370 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 371 { /* Found valid root. */ 372 *vpp = mi->mi_rootvp; 373 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 374 vref(*vpp); 375 vn_lock(*vpp, LK_EXCLUSIVE); 376 MARK_INT_SAT(CODA_ROOT_STATS); 377 return(0); 378 } 379 } 380 381 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); 382 383 if (!error) { 384 /* 385 * Save the new rootfid in the cnode, and rehash the cnode into the 386 * cnode hash with the new fid key. 387 */ 388 coda_unsave(VTOC(mi->mi_rootvp)); 389 VTOC(mi->mi_rootvp)->c_fid = VFid; 390 coda_save(VTOC(mi->mi_rootvp)); 391 392 *vpp = mi->mi_rootvp; 393 vref(*vpp); 394 vn_lock(*vpp, LK_EXCLUSIVE); 395 MARK_INT_SAT(CODA_ROOT_STATS); 396 goto exit; 397 } else if (error == ENODEV || error == EINTR) { 398 /* Gross hack here! */ 399 /* 400 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 401 * ENODEV. Return the uninitialized root vnode to allow vfs 402 * operations such as unmount to continue. Without this hack, 403 * there is no way to do an unmount if Venus dies before a 404 * successful CODA_ROOT call is done. All vnode operations 405 * will fail. 406 */ 407 *vpp = mi->mi_rootvp; 408 vref(*vpp); 409 vn_lock(*vpp, LK_EXCLUSIVE); 410 MARK_INT_FAIL(CODA_ROOT_STATS); 411 error = 0; 412 goto exit; 413 } else { 414 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 415 MARK_INT_FAIL(CODA_ROOT_STATS); 416 417 goto exit; 418 } 419 exit: 420 return(error); 421 } 422 423 /* 424 * Get file system statistics. 425 */ 426 int 427 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) 428 { 429 struct lwp *l = curlwp; 430 struct coda_statfs fsstat; 431 int error; 432 433 ENTRY; 434 MARK_ENTRY(CODA_STATFS_STATS); 435 if (!CODA_MOUNTED(vfsp)) { 436 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 437 return(EINVAL); 438 } 439 440 /* XXX - what to do about f_flags, others? --bnoble */ 441 /* Below This is what AFS does 442 #define NB_SFS_SIZ 0x895440 443 */ 444 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 445 446 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); 447 448 if (!error) { 449 sbp->f_bsize = 8192; /* XXX */ 450 sbp->f_frsize = 8192; /* XXX */ 451 sbp->f_iosize = 8192; /* XXX */ 452 sbp->f_blocks = fsstat.f_blocks; 453 sbp->f_bfree = fsstat.f_bfree; 454 sbp->f_bavail = fsstat.f_bavail; 455 sbp->f_bresvd = 0; 456 sbp->f_files = fsstat.f_files; 457 sbp->f_ffree = fsstat.f_ffree; 458 sbp->f_favail = fsstat.f_ffree; 459 sbp->f_fresvd = 0; 460 copy_statvfs_info(sbp, vfsp); 461 } 462 463 MARK_INT_SAT(CODA_STATFS_STATS); 464 return(error); 465 } 466 467 /* 468 * Flush any pending I/O. 469 */ 470 int 471 coda_sync(struct mount *vfsp, int waitfor, 472 kauth_cred_t cred) 473 { 474 ENTRY; 475 MARK_ENTRY(CODA_SYNC_STATS); 476 MARK_INT_SAT(CODA_SYNC_STATS); 477 return(0); 478 } 479 480 int 481 coda_vget(struct mount *vfsp, ino_t ino, 482 struct vnode **vpp) 483 { 484 ENTRY; 485 return (EOPNOTSUPP); 486 } 487 488 /* 489 * fhtovp is now what vget used to be in 4.3-derived systems. For 490 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 491 * a type-specific fid. 492 */ 493 int 494 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 495 struct vnode **vpp, int *exflagsp, 496 kauth_cred_t *creadanonp) 497 { 498 struct cfid *cfid = (struct cfid *)fhp; 499 struct cnode *cp = 0; 500 int error; 501 struct lwp *l = curlwp; /* XXX -mach */ 502 CodaFid VFid; 503 int vtype; 504 505 ENTRY; 506 507 MARK_ENTRY(CODA_VGET_STATS); 508 /* Check for vget of control object. */ 509 if (IS_CTL_FID(&cfid->cfid_fid)) { 510 *vpp = coda_ctlvp; 511 vref(coda_ctlvp); 512 MARK_INT_SAT(CODA_VGET_STATS); 513 return(0); 514 } 515 516 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype); 517 518 if (error) { 519 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 520 *vpp = (struct vnode *)0; 521 } else { 522 CODADEBUG(CODA_VGET, 523 myprintf(("vget: %s type %d result %d\n", 524 coda_f2s(&VFid), vtype, error)); ) 525 526 cp = make_coda_node(&VFid, vfsp, vtype); 527 *vpp = CTOV(cp); 528 } 529 return(error); 530 } 531 532 int 533 coda_vptofh(struct vnode *vnp, struct fid *fidp) 534 { 535 ENTRY; 536 return (EOPNOTSUPP); 537 } 538 539 void 540 coda_init(void) 541 { 542 ENTRY; 543 } 544 545 void 546 coda_done(void) 547 { 548 ENTRY; 549 } 550 551 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 552 { 553 554 sysctl_createv(clog, 0, NULL, NULL, 555 CTLFLAG_PERMANENT, 556 CTLTYPE_NODE, "coda", 557 SYSCTL_DESCR("code vfs options"), 558 NULL, 0, NULL, 0, 559 CTL_VFS, 18, CTL_EOL); 560 /* 561 * XXX the "18" above could be dynamic, thereby eliminating 562 * one more instance of the "number to vfs" mapping problem, 563 * but "18" is the order as taken from sys/mount.h 564 */ 565 566 /* 567 sysctl_createv(clog, 0, NULL, NULL, 568 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 569 CTLTYPE_INT, "clusterread", 570 SYSCTL_DESCR( anyone? ), 571 NULL, 0, &doclusterread, 0, 572 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 573 */ 574 } 575 576 /* 577 * To allow for greater ease of use, some vnodes may be orphaned when 578 * Venus dies. Certain operations should still be allowed to go 579 * through, but without propagating orphan-ness. So this function will 580 * get a new vnode for the file from the current run of Venus. 581 */ 582 583 int 584 getNewVnode(struct vnode **vpp) 585 { 586 struct cfid cfid; 587 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 588 589 ENTRY; 590 591 cfid.cfid_len = (short)sizeof(CodaFid); 592 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 593 /* XXX ? */ 594 595 /* We're guessing that if set, the 1st element on the list is a 596 * valid vnode to use. If not, return ENODEV as venus is dead. 597 */ 598 if (mi->mi_vfsp == NULL) 599 return ENODEV; 600 601 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 602 NULL, NULL); 603 } 604 605 #include <ufs/ufs/quota.h> 606 #include <ufs/ufs/ufsmount.h> 607 /* get the mount structure corresponding to a given device. Assume 608 * device corresponds to a UFS. Return NULL if no device is found. 609 */ 610 struct mount *devtomp(dev_t dev) 611 { 612 struct mount *mp; 613 614 mutex_enter(&mountlist_lock); 615 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 616 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 617 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 618 /* mount corresponds to UFS and the device matches one we want */ 619 break; 620 } 621 } 622 mutex_exit(&mountlist_lock); 623 return mp; 624 } 625