1 /* $NetBSD: coda_vfsops.c,v 1.48 2006/05/14 21:24:49 elad 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 1.48 2006/05/14 21:24:49 elad 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 68 #include <coda/coda.h> 69 #include <coda/cnode.h> 70 #include <coda/coda_vfsops.h> 71 #include <coda/coda_venus.h> 72 #include <coda/coda_subr.h> 73 #include <coda/coda_opstats.h> 74 /* for VN_RDEV */ 75 #include <miscfs/specfs/specdev.h> 76 77 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables"); 78 79 int codadebug = 0; 80 81 int coda_vfsop_print_entry = 0; 82 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) 83 84 struct vnode *coda_ctlvp; 85 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ 86 87 /* structure to keep statistics of internally generated/satisfied calls */ 88 89 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; 90 91 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) 92 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) 93 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) 94 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) 95 96 extern const struct cdevsw vcoda_cdevsw; 97 extern const struct vnodeopv_desc coda_vnodeop_opv_desc; 98 99 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { 100 &coda_vnodeop_opv_desc, 101 NULL, 102 }; 103 104 struct vfsops coda_vfsops = { 105 MOUNT_CODA, 106 coda_mount, 107 coda_start, 108 coda_unmount, 109 coda_root, 110 coda_quotactl, 111 coda_nb_statvfs, 112 coda_sync, 113 coda_vget, 114 NULL, /* vfs_fhtovp */ 115 NULL, /* vfs_vptofh */ 116 coda_init, 117 NULL, 118 coda_done, 119 (int (*)(void)) eopnotsupp, 120 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp, 121 vfs_stdextattrctl, 122 coda_vnodeopv_descs, 123 0 124 }; 125 126 VFS_ATTACH(coda_vfsops); 127 128 int 129 coda_vfsopstats_init(void) 130 { 131 int i; 132 133 for (i=0;i<CODA_VFSOPS_SIZE;i++) { 134 coda_vfsopstats[i].opcode = i; 135 coda_vfsopstats[i].entries = 0; 136 coda_vfsopstats[i].sat_intrn = 0; 137 coda_vfsopstats[i].unsat_intrn = 0; 138 coda_vfsopstats[i].gen_intrn = 0; 139 } 140 141 return 0; 142 } 143 144 /* 145 * cfs mount vfsop 146 * Set up mount info record and attach it to vfs struct. 147 */ 148 /*ARGSUSED*/ 149 int 150 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */ 151 const char *path, /* path covered: ignored by the fs-layer */ 152 void *data, /* Need to define a data type for this in netbsd? */ 153 struct nameidata *ndp, /* Clobber this to lookup the device name */ 154 struct lwp *l) /* The ever-famous lwp pointer */ 155 { 156 struct vnode *dvp; 157 struct cnode *cp; 158 dev_t dev; 159 struct coda_mntinfo *mi; 160 struct vnode *rtvp; 161 const struct cdevsw *cdev; 162 CodaFid rootfid = INVAL_FID; 163 CodaFid ctlfid = CTL_FID; 164 int error; 165 166 if (vfsp->mnt_flag & MNT_GETARGS) 167 return 0; 168 ENTRY; 169 170 coda_vfsopstats_init(); 171 coda_vnodeopstats_init(); 172 173 MARK_ENTRY(CODA_MOUNT_STATS); 174 if (CODA_MOUNTED(vfsp)) { 175 MARK_INT_FAIL(CODA_MOUNT_STATS); 176 return(EBUSY); 177 } 178 179 /* Validate mount device. Similar to getmdev(). */ 180 181 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, l); 182 error = namei(ndp); 183 dvp = ndp->ni_vp; 184 185 if (error) { 186 MARK_INT_FAIL(CODA_MOUNT_STATS); 187 return (error); 188 } 189 if (dvp->v_type != VCHR) { 190 MARK_INT_FAIL(CODA_MOUNT_STATS); 191 vrele(dvp); 192 return(ENXIO); 193 } 194 dev = dvp->v_specinfo->si_rdev; 195 vrele(dvp); 196 cdev = cdevsw_lookup(dev); 197 if (cdev == NULL) { 198 MARK_INT_FAIL(CODA_MOUNT_STATS); 199 return(ENXIO); 200 } 201 202 /* 203 * See if the device table matches our expectations. 204 */ 205 if (cdev != &vcoda_cdevsw) 206 { 207 MARK_INT_FAIL(CODA_MOUNT_STATS); 208 return(ENXIO); 209 } 210 211 if (minor(dev) >= NVCODA || minor(dev) < 0) { 212 MARK_INT_FAIL(CODA_MOUNT_STATS); 213 return(ENXIO); 214 } 215 216 /* 217 * Initialize the mount record and link it to the vfs struct 218 */ 219 mi = &coda_mnttbl[minor(dev)]; 220 221 if (!VC_OPEN(&mi->mi_vcomm)) { 222 MARK_INT_FAIL(CODA_MOUNT_STATS); 223 return(ENODEV); 224 } 225 226 /* No initialization (here) of mi_vcomm! */ 227 vfsp->mnt_data = mi; 228 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; 229 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); 230 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; 231 vfsp->mnt_stat.f_namemax = MAXNAMLEN; 232 mi->mi_vfsp = vfsp; 233 234 /* 235 * Make a root vnode to placate the Vnode interface, but don't 236 * actually make the CODA_ROOT call to venus until the first call 237 * to coda_root in case a server is down while venus is starting. 238 */ 239 cp = make_coda_node(&rootfid, vfsp, VDIR); 240 rtvp = CTOV(cp); 241 rtvp->v_flag |= VROOT; 242 243 /* cp = make_coda_node(&ctlfid, vfsp, VCHR); 244 The above code seems to cause a loop in the cnode links. 245 I don't totally understand when it happens, it is caught 246 when closing down the system. 247 */ 248 cp = make_coda_node(&ctlfid, 0, VCHR); 249 250 coda_ctlvp = CTOV(cp); 251 252 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ 253 mi->mi_vfsp = vfsp; 254 mi->mi_rootvp = rtvp; 255 256 /* set filesystem block size */ 257 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ 258 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ 259 260 /* error is currently guaranteed to be zero, but in case some 261 code changes... */ 262 CODADEBUG(1, 263 myprintf(("coda_mount returned %d\n",error));); 264 if (error) 265 MARK_INT_FAIL(CODA_MOUNT_STATS); 266 else 267 MARK_INT_SAT(CODA_MOUNT_STATS); 268 269 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp, 270 l); 271 } 272 273 int 274 coda_start(struct mount *vfsp, int flags, struct lwp *l) 275 { 276 ENTRY; 277 vftomi(vfsp)->mi_started = 1; 278 return (0); 279 } 280 281 int 282 coda_unmount(struct mount *vfsp, int mntflags, struct lwp *l) 283 { 284 struct coda_mntinfo *mi = vftomi(vfsp); 285 int active, error = 0; 286 287 ENTRY; 288 MARK_ENTRY(CODA_UMOUNT_STATS); 289 if (!CODA_MOUNTED(vfsp)) { 290 MARK_INT_FAIL(CODA_UMOUNT_STATS); 291 return(EINVAL); 292 } 293 294 if (mi->mi_vfsp == vfsp) { /* We found the victim */ 295 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) 296 return (EBUSY); /* Venus is still running */ 297 298 #ifdef DEBUG 299 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); 300 #endif 301 mi->mi_started = 0; 302 303 vrele(mi->mi_rootvp); 304 305 active = coda_kill(vfsp, NOT_DOWNCALL); 306 mi->mi_rootvp->v_flag &= ~VROOT; 307 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); 308 printf("coda_unmount: active = %d, vflush active %d\n", active, error); 309 error = 0; 310 311 /* I'm going to take this out to allow lookups to go through. I'm 312 * not sure it's important anyway. -- DCS 2/2/94 313 */ 314 /* vfsp->VFS_DATA = NULL; */ 315 316 /* No more vfsp's to hold onto */ 317 mi->mi_vfsp = NULL; 318 mi->mi_rootvp = NULL; 319 320 if (error) 321 MARK_INT_FAIL(CODA_UMOUNT_STATS); 322 else 323 MARK_INT_SAT(CODA_UMOUNT_STATS); 324 325 return(error); 326 } 327 return (EINVAL); 328 } 329 330 /* 331 * find root of cfs 332 */ 333 int 334 coda_root(struct mount *vfsp, struct vnode **vpp) 335 { 336 struct coda_mntinfo *mi = vftomi(vfsp); 337 int error; 338 struct proc *p = curproc; /* XXX - bnoble */ 339 CodaFid VFid; 340 static const CodaFid invalfid = INVAL_FID; 341 342 ENTRY; 343 MARK_ENTRY(CODA_ROOT_STATS); 344 345 if (vfsp == mi->mi_vfsp) { 346 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) 347 { /* Found valid root. */ 348 *vpp = mi->mi_rootvp; 349 /* On Mach, this is vref. On NetBSD, VOP_LOCK */ 350 vref(*vpp); 351 vn_lock(*vpp, LK_EXCLUSIVE); 352 MARK_INT_SAT(CODA_ROOT_STATS); 353 return(0); 354 } 355 } 356 357 error = venus_root(vftomi(vfsp), p->p_cred, p, &VFid); 358 359 if (!error) { 360 /* 361 * Save the new rootfid in the cnode, and rehash the cnode into the 362 * cnode hash with the new fid key. 363 */ 364 coda_unsave(VTOC(mi->mi_rootvp)); 365 VTOC(mi->mi_rootvp)->c_fid = VFid; 366 coda_save(VTOC(mi->mi_rootvp)); 367 368 *vpp = mi->mi_rootvp; 369 vref(*vpp); 370 vn_lock(*vpp, LK_EXCLUSIVE); 371 MARK_INT_SAT(CODA_ROOT_STATS); 372 goto exit; 373 } else if (error == ENODEV || error == EINTR) { 374 /* Gross hack here! */ 375 /* 376 * If Venus fails to respond to the CODA_ROOT call, coda_call returns 377 * ENODEV. Return the uninitialized root vnode to allow vfs 378 * operations such as unmount to continue. Without this hack, 379 * there is no way to do an unmount if Venus dies before a 380 * successful CODA_ROOT call is done. All vnode operations 381 * will fail. 382 */ 383 *vpp = mi->mi_rootvp; 384 vref(*vpp); 385 vn_lock(*vpp, LK_EXCLUSIVE); 386 MARK_INT_FAIL(CODA_ROOT_STATS); 387 error = 0; 388 goto exit; 389 } else { 390 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); 391 MARK_INT_FAIL(CODA_ROOT_STATS); 392 393 goto exit; 394 } 395 exit: 396 return(error); 397 } 398 399 int 400 coda_quotactl(struct mount *vfsp, int cmd, uid_t uid, void *arg, 401 struct lwp *l) 402 { 403 ENTRY; 404 return (EOPNOTSUPP); 405 } 406 407 /* 408 * Get file system statistics. 409 */ 410 int 411 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp, struct lwp *l) 412 { 413 struct coda_statfs fsstat; 414 struct proc *p = l->l_proc; 415 int error; 416 417 ENTRY; 418 MARK_ENTRY(CODA_STATFS_STATS); 419 if (!CODA_MOUNTED(vfsp)) { 420 /* MARK_INT_FAIL(CODA_STATFS_STATS); */ 421 return(EINVAL); 422 } 423 424 /* XXX - what to do about f_flags, others? --bnoble */ 425 /* Below This is what AFS does 426 #define NB_SFS_SIZ 0x895440 427 */ 428 /* Note: Normal fs's have a bsize of 0x400 == 1024 */ 429 430 error = venus_statfs(vftomi(vfsp), p->p_cred, l, &fsstat); 431 432 if (!error) { 433 sbp->f_bsize = 8192; /* XXX */ 434 sbp->f_frsize = 8192; /* XXX */ 435 sbp->f_iosize = 8192; /* XXX */ 436 sbp->f_blocks = fsstat.f_blocks; 437 sbp->f_bfree = fsstat.f_bfree; 438 sbp->f_bavail = fsstat.f_bavail; 439 sbp->f_bresvd = 0; 440 sbp->f_files = fsstat.f_files; 441 sbp->f_ffree = fsstat.f_ffree; 442 sbp->f_favail = fsstat.f_ffree; 443 sbp->f_fresvd = 0; 444 copy_statvfs_info(sbp, vfsp); 445 } 446 447 MARK_INT_SAT(CODA_STATFS_STATS); 448 return(error); 449 } 450 451 /* 452 * Flush any pending I/O. 453 */ 454 int 455 coda_sync(struct mount *vfsp, int waitfor, kauth_cred_t cred, struct lwp *l) 456 { 457 ENTRY; 458 MARK_ENTRY(CODA_SYNC_STATS); 459 MARK_INT_SAT(CODA_SYNC_STATS); 460 return(0); 461 } 462 463 int 464 coda_vget(struct mount *vfsp, ino_t ino, struct vnode **vpp) 465 { 466 ENTRY; 467 return (EOPNOTSUPP); 468 } 469 470 /* 471 * fhtovp is now what vget used to be in 4.3-derived systems. For 472 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than 473 * a type-specific fid. 474 */ 475 int 476 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, 477 struct vnode **vpp, int *exflagsp, kauth_cred_t *creadanonp) 478 { 479 struct cfid *cfid = (struct cfid *)fhp; 480 struct cnode *cp = 0; 481 int error; 482 struct proc *p = curproc; /* XXX -mach */ 483 CodaFid VFid; 484 int vtype; 485 486 ENTRY; 487 488 MARK_ENTRY(CODA_VGET_STATS); 489 /* Check for vget of control object. */ 490 if (IS_CTL_FID(&cfid->cfid_fid)) { 491 *vpp = coda_ctlvp; 492 vref(coda_ctlvp); 493 MARK_INT_SAT(CODA_VGET_STATS); 494 return(0); 495 } 496 497 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred, p, &VFid, &vtype); 498 499 if (error) { 500 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) 501 *vpp = (struct vnode *)0; 502 } else { 503 CODADEBUG(CODA_VGET, 504 myprintf(("vget: %s type %d result %d\n", 505 coda_f2s(&VFid), vtype, error)); ) 506 507 cp = make_coda_node(&VFid, vfsp, vtype); 508 *vpp = CTOV(cp); 509 } 510 return(error); 511 } 512 513 int 514 coda_vptofh(struct vnode *vnp, struct fid *fidp) 515 { 516 ENTRY; 517 return (EOPNOTSUPP); 518 } 519 520 void 521 coda_init(void) 522 { 523 ENTRY; 524 } 525 526 void 527 coda_done(void) 528 { 529 ENTRY; 530 } 531 532 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") 533 { 534 sysctl_createv(clog, 0, NULL, NULL, 535 CTLFLAG_PERMANENT, 536 CTLTYPE_NODE, "vfs", NULL, 537 NULL, 0, NULL, 0, 538 CTL_VFS, CTL_EOL); 539 sysctl_createv(clog, 0, NULL, NULL, 540 CTLFLAG_PERMANENT, 541 CTLTYPE_NODE, "coda", 542 SYSCTL_DESCR("code vfs options"), 543 NULL, 0, NULL, 0, 544 CTL_VFS, 18, CTL_EOL); 545 /* 546 * XXX the "18" above could be dynamic, thereby eliminating 547 * one more instance of the "number to vfs" mapping problem, 548 * but "18" is the order as taken from sys/mount.h 549 */ 550 551 /* 552 sysctl_createv(clog, 0, NULL, NULL, 553 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 554 CTLTYPE_INT, "clusterread", 555 SYSCTL_DESCR( anyone? ), 556 NULL, 0, &doclusterread, 0, 557 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); 558 */ 559 } 560 561 /* 562 * To allow for greater ease of use, some vnodes may be orphaned when 563 * Venus dies. Certain operations should still be allowed to go 564 * through, but without propagating orphan-ness. So this function will 565 * get a new vnode for the file from the current run of Venus. 566 */ 567 568 int 569 getNewVnode(struct vnode **vpp) 570 { 571 struct cfid cfid; 572 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); 573 574 ENTRY; 575 576 cfid.cfid_len = (short)sizeof(CodaFid); 577 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ 578 /* XXX ? */ 579 580 /* We're guessing that if set, the 1st element on the list is a 581 * valid vnode to use. If not, return ENODEV as venus is dead. 582 */ 583 if (mi->mi_vfsp == NULL) 584 return ENODEV; 585 586 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, 587 NULL, NULL); 588 } 589 590 #include <ufs/ufs/quota.h> 591 #include <ufs/ufs/ufsmount.h> 592 /* get the mount structure corresponding to a given device. Assume 593 * device corresponds to a UFS. Return NULL if no device is found. 594 */ 595 struct mount *devtomp(dev_t dev) 596 { 597 struct mount *mp, *nmp; 598 599 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) { 600 nmp = mp->mnt_list.cqe_next; 601 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) && 602 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) { 603 /* mount corresponds to UFS and the device matches one we want */ 604 return(mp); 605 } 606 } 607 /* mount structure wasn't found */ 608 return(NULL); 609 } 610