1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed 6 * to Berkeley by John Heidemann of the UCLA Ficus project. 7 * 8 * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bio.h> 41 #include <sys/buf.h> 42 #include <sys/conf.h> 43 #include <sys/kernel.h> 44 #include <sys/limits.h> 45 #include <sys/lock.h> 46 #include <sys/malloc.h> 47 #include <sys/mount.h> 48 #include <sys/mutex.h> 49 #include <sys/unistd.h> 50 #include <sys/vnode.h> 51 #include <sys/poll.h> 52 53 #include <vm/vm.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_extern.h> 56 #include <vm/pmap.h> 57 #include <vm/vm_map.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_pager.h> 60 #include <vm/vnode_pager.h> 61 62 static int vop_nolookup(struct vop_lookup_args *); 63 static int vop_nostrategy(struct vop_strategy_args *); 64 65 /* 66 * This vnode table stores what we want to do if the filesystem doesn't 67 * implement a particular VOP. 68 * 69 * If there is no specific entry here, we will return EOPNOTSUPP. 70 * 71 */ 72 73 struct vop_vector default_vnodeops = { 74 .vop_default = NULL, 75 .vop_bypass = VOP_EOPNOTSUPP, 76 77 .vop_advlock = VOP_EINVAL, 78 .vop_bmap = vop_stdbmap, 79 .vop_close = VOP_NULL, 80 .vop_fsync = VOP_NULL, 81 .vop_getpages = vop_stdgetpages, 82 .vop_getwritemount = vop_stdgetwritemount, 83 .vop_inactive = VOP_NULL, 84 .vop_ioctl = VOP_ENOTTY, 85 .vop_islocked = vop_stdislocked, 86 .vop_lease = VOP_NULL, 87 .vop_lock = vop_stdlock, 88 .vop_lookup = vop_nolookup, 89 .vop_open = VOP_NULL, 90 .vop_pathconf = VOP_EINVAL, 91 .vop_poll = vop_nopoll, 92 .vop_putpages = vop_stdputpages, 93 .vop_readlink = VOP_EINVAL, 94 .vop_revoke = VOP_PANIC, 95 .vop_strategy = vop_nostrategy, 96 .vop_unlock = vop_stdunlock, 97 }; 98 99 /* 100 * Series of placeholder functions for various error returns for 101 * VOPs. 102 */ 103 104 int 105 vop_eopnotsupp(struct vop_generic_args *ap) 106 { 107 /* 108 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 109 */ 110 111 return (EOPNOTSUPP); 112 } 113 114 int 115 vop_ebadf(struct vop_generic_args *ap) 116 { 117 118 return (EBADF); 119 } 120 121 int 122 vop_enotty(struct vop_generic_args *ap) 123 { 124 125 return (ENOTTY); 126 } 127 128 int 129 vop_einval(struct vop_generic_args *ap) 130 { 131 132 return (EINVAL); 133 } 134 135 int 136 vop_null(struct vop_generic_args *ap) 137 { 138 139 return (0); 140 } 141 142 /* 143 * Helper function to panic on some bad VOPs in some filesystems. 144 */ 145 int 146 vop_panic(struct vop_generic_args *ap) 147 { 148 149 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 150 } 151 152 /* 153 * vop_std<something> and vop_no<something> are default functions for use by 154 * filesystems that need the "default reasonable" implementation for a 155 * particular operation. 156 * 157 * The documentation for the operations they implement exists (if it exists) 158 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 159 */ 160 161 /* 162 * Default vop for filesystems that do not support name lookup 163 */ 164 static int 165 vop_nolookup(ap) 166 struct vop_lookup_args /* { 167 struct vnode *a_dvp; 168 struct vnode **a_vpp; 169 struct componentname *a_cnp; 170 } */ *ap; 171 { 172 173 *ap->a_vpp = NULL; 174 return (ENOTDIR); 175 } 176 177 /* 178 * vop_nostrategy: 179 * 180 * Strategy routine for VFS devices that have none. 181 * 182 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 183 * routine. Typically this is done for a BIO_READ strategy call. 184 * Typically B_INVAL is assumed to already be clear prior to a write 185 * and should not be cleared manually unless you just made the buffer 186 * invalid. BIO_ERROR should be cleared either way. 187 */ 188 189 static int 190 vop_nostrategy (struct vop_strategy_args *ap) 191 { 192 printf("No strategy for buffer at %p\n", ap->a_bp); 193 vprint("vnode", ap->a_vp); 194 ap->a_bp->b_ioflags |= BIO_ERROR; 195 ap->a_bp->b_error = EOPNOTSUPP; 196 bufdone(ap->a_bp); 197 return (EOPNOTSUPP); 198 } 199 200 /* 201 * vop_stdpathconf: 202 * 203 * Standard implementation of POSIX pathconf, to get information about limits 204 * for a filesystem. 205 * Override per filesystem for the case where the filesystem has smaller 206 * limits. 207 */ 208 int 209 vop_stdpathconf(ap) 210 struct vop_pathconf_args /* { 211 struct vnode *a_vp; 212 int a_name; 213 int *a_retval; 214 } */ *ap; 215 { 216 217 switch (ap->a_name) { 218 case _PC_LINK_MAX: 219 *ap->a_retval = LINK_MAX; 220 return (0); 221 case _PC_MAX_CANON: 222 *ap->a_retval = MAX_CANON; 223 return (0); 224 case _PC_MAX_INPUT: 225 *ap->a_retval = MAX_INPUT; 226 return (0); 227 case _PC_PIPE_BUF: 228 *ap->a_retval = PIPE_BUF; 229 return (0); 230 case _PC_CHOWN_RESTRICTED: 231 *ap->a_retval = 1; 232 return (0); 233 case _PC_VDISABLE: 234 *ap->a_retval = _POSIX_VDISABLE; 235 return (0); 236 default: 237 return (EINVAL); 238 } 239 /* NOTREACHED */ 240 } 241 242 /* 243 * Standard lock, unlock and islocked functions. 244 */ 245 int 246 vop_stdlock(ap) 247 struct vop_lock_args /* { 248 struct vnode *a_vp; 249 int a_flags; 250 struct thread *a_td; 251 } */ *ap; 252 { 253 struct vnode *vp = ap->a_vp; 254 255 #ifndef DEBUG_LOCKS 256 return (lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td)); 257 #else 258 return (debuglockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 259 ap->a_td, "vop_stdlock", vp->filename, vp->line)); 260 #endif 261 } 262 263 /* See above. */ 264 int 265 vop_stdunlock(ap) 266 struct vop_unlock_args /* { 267 struct vnode *a_vp; 268 int a_flags; 269 struct thread *a_td; 270 } */ *ap; 271 { 272 struct vnode *vp = ap->a_vp; 273 274 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp), 275 ap->a_td)); 276 } 277 278 /* See above. */ 279 int 280 vop_stdislocked(ap) 281 struct vop_islocked_args /* { 282 struct vnode *a_vp; 283 struct thread *a_td; 284 } */ *ap; 285 { 286 287 return (lockstatus(ap->a_vp->v_vnlock, ap->a_td)); 288 } 289 290 /* 291 * Return true for select/poll. 292 */ 293 int 294 vop_nopoll(ap) 295 struct vop_poll_args /* { 296 struct vnode *a_vp; 297 int a_events; 298 struct ucred *a_cred; 299 struct thread *a_td; 300 } */ *ap; 301 { 302 /* 303 * Return true for read/write. If the user asked for something 304 * special, return POLLNVAL, so that clients have a way of 305 * determining reliably whether or not the extended 306 * functionality is present without hard-coding knowledge 307 * of specific filesystem implementations. 308 * Stay in sync with kern_conf.c::no_poll(). 309 */ 310 if (ap->a_events & ~POLLSTANDARD) 311 return (POLLNVAL); 312 313 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 314 } 315 316 /* 317 * Implement poll for local filesystems that support it. 318 */ 319 int 320 vop_stdpoll(ap) 321 struct vop_poll_args /* { 322 struct vnode *a_vp; 323 int a_events; 324 struct ucred *a_cred; 325 struct thread *a_td; 326 } */ *ap; 327 { 328 if (ap->a_events & ~POLLSTANDARD) 329 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 330 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 331 } 332 333 /* 334 * Return our mount point, as we will take charge of the writes. 335 */ 336 int 337 vop_stdgetwritemount(ap) 338 struct vop_getwritemount_args /* { 339 struct vnode *a_vp; 340 struct mount **a_mpp; 341 } */ *ap; 342 { 343 344 *(ap->a_mpp) = ap->a_vp->v_mount; 345 return (0); 346 } 347 348 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 349 int 350 vop_stdbmap(ap) 351 struct vop_bmap_args /* { 352 struct vnode *a_vp; 353 daddr_t a_bn; 354 struct bufobj **a_bop; 355 daddr_t *a_bnp; 356 int *a_runp; 357 int *a_runb; 358 } */ *ap; 359 { 360 361 if (ap->a_bop != NULL) 362 *ap->a_bop = &ap->a_vp->v_bufobj; 363 if (ap->a_bnp != NULL) 364 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 365 if (ap->a_runp != NULL) 366 *ap->a_runp = 0; 367 if (ap->a_runb != NULL) 368 *ap->a_runb = 0; 369 return (0); 370 } 371 372 int 373 vop_stdfsync(ap) 374 struct vop_fsync_args /* { 375 struct vnode *a_vp; 376 struct ucred *a_cred; 377 int a_waitfor; 378 struct thread *a_td; 379 } */ *ap; 380 { 381 struct vnode *vp = ap->a_vp; 382 struct buf *bp; 383 struct bufobj *bo; 384 struct buf *nbp; 385 int error = 0; 386 int maxretry = 1000; /* large, arbitrarily chosen */ 387 388 VI_LOCK(vp); 389 loop1: 390 /* 391 * MARK/SCAN initialization to avoid infinite loops. 392 */ 393 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) { 394 bp->b_vflags &= ~BV_SCANNED; 395 bp->b_error = 0; 396 } 397 398 /* 399 * Flush all dirty buffers associated with a vnode. 400 */ 401 loop2: 402 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 403 if ((bp->b_vflags & BV_SCANNED) != 0) 404 continue; 405 bp->b_vflags |= BV_SCANNED; 406 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 407 continue; 408 VI_UNLOCK(vp); 409 if ((bp->b_flags & B_DELWRI) == 0) 410 panic("fsync: not dirty"); 411 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 412 vfs_bio_awrite(bp); 413 } else { 414 bremfree(bp); 415 bawrite(bp); 416 } 417 VI_LOCK(vp); 418 goto loop2; 419 } 420 421 /* 422 * If synchronous the caller expects us to completely resolve all 423 * dirty buffers in the system. Wait for in-progress I/O to 424 * complete (which could include background bitmap writes), then 425 * retry if dirty blocks still exist. 426 */ 427 if (ap->a_waitfor == MNT_WAIT) { 428 bo = &vp->v_bufobj; 429 bufobj_wwait(bo, 0, 0); 430 if (bo->bo_dirty.bv_cnt > 0) { 431 /* 432 * If we are unable to write any of these buffers 433 * then we fail now rather than trying endlessly 434 * to write them out. 435 */ 436 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 437 if ((error = bp->b_error) == 0) 438 continue; 439 if (error == 0 && --maxretry >= 0) 440 goto loop1; 441 error = EAGAIN; 442 } 443 } 444 VI_UNLOCK(vp); 445 if (error == EAGAIN) 446 vprint("fsync: giving up on dirty", vp); 447 448 return (error); 449 } 450 451 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 452 int 453 vop_stdgetpages(ap) 454 struct vop_getpages_args /* { 455 struct vnode *a_vp; 456 vm_page_t *a_m; 457 int a_count; 458 int a_reqpage; 459 vm_ooffset_t a_offset; 460 } */ *ap; 461 { 462 463 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 464 ap->a_count, ap->a_reqpage); 465 } 466 467 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 468 int 469 vop_stdputpages(ap) 470 struct vop_putpages_args /* { 471 struct vnode *a_vp; 472 vm_page_t *a_m; 473 int a_count; 474 int a_sync; 475 int *a_rtvals; 476 vm_ooffset_t a_offset; 477 } */ *ap; 478 { 479 480 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 481 ap->a_sync, ap->a_rtvals); 482 } 483 484 /* 485 * vfs default ops 486 * used to fill the vfs function table to get reasonable default return values. 487 */ 488 int 489 vfs_stdroot (mp, flags, vpp, td) 490 struct mount *mp; 491 int flags; 492 struct vnode **vpp; 493 struct thread *td; 494 { 495 496 return (EOPNOTSUPP); 497 } 498 499 int 500 vfs_stdstatfs (mp, sbp, td) 501 struct mount *mp; 502 struct statfs *sbp; 503 struct thread *td; 504 { 505 506 return (EOPNOTSUPP); 507 } 508 509 int 510 vfs_stdvptofh (vp, fhp) 511 struct vnode *vp; 512 struct fid *fhp; 513 { 514 515 return (EOPNOTSUPP); 516 } 517 518 int 519 vfs_stdquotactl (mp, cmds, uid, arg, td) 520 struct mount *mp; 521 int cmds; 522 uid_t uid; 523 caddr_t arg; 524 struct thread *td; 525 { 526 527 return (EOPNOTSUPP); 528 } 529 530 int 531 vfs_stdsync(mp, waitfor, td) 532 struct mount *mp; 533 int waitfor; 534 struct thread *td; 535 { 536 struct vnode *vp, *nvp; 537 int error, lockreq, allerror = 0; 538 539 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 540 if (waitfor != MNT_WAIT) 541 lockreq |= LK_NOWAIT; 542 /* 543 * Force stale buffer cache information to be flushed. 544 */ 545 MNT_ILOCK(mp); 546 loop: 547 MNT_VNODE_FOREACH(vp, mp, nvp) { 548 549 VI_LOCK(vp); 550 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 551 VI_UNLOCK(vp); 552 continue; 553 } 554 MNT_IUNLOCK(mp); 555 556 if ((error = vget(vp, lockreq, td)) != 0) { 557 MNT_ILOCK(mp); 558 if (error == ENOENT) 559 goto loop; 560 continue; 561 } 562 error = VOP_FSYNC(vp, waitfor, td); 563 if (error) 564 allerror = error; 565 566 VOP_UNLOCK(vp, 0, td); 567 vrele(vp); 568 MNT_ILOCK(mp); 569 } 570 MNT_IUNLOCK(mp); 571 return (allerror); 572 } 573 574 int 575 vfs_stdnosync (mp, waitfor, td) 576 struct mount *mp; 577 int waitfor; 578 struct thread *td; 579 { 580 581 return (0); 582 } 583 584 int 585 vfs_stdvget (mp, ino, flags, vpp) 586 struct mount *mp; 587 ino_t ino; 588 int flags; 589 struct vnode **vpp; 590 { 591 592 return (EOPNOTSUPP); 593 } 594 595 int 596 vfs_stdfhtovp (mp, fhp, vpp) 597 struct mount *mp; 598 struct fid *fhp; 599 struct vnode **vpp; 600 { 601 602 return (EOPNOTSUPP); 603 } 604 605 int 606 vfs_stdinit (vfsp) 607 struct vfsconf *vfsp; 608 { 609 610 return (0); 611 } 612 613 int 614 vfs_stduninit (vfsp) 615 struct vfsconf *vfsp; 616 { 617 618 return(0); 619 } 620 621 int 622 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td) 623 struct mount *mp; 624 int cmd; 625 struct vnode *filename_vp; 626 int attrnamespace; 627 const char *attrname; 628 struct thread *td; 629 { 630 631 if (filename_vp != NULL) 632 VOP_UNLOCK(filename_vp, 0, td); 633 return (EOPNOTSUPP); 634 } 635 636 int 637 vfs_stdsysctl(mp, op, req) 638 struct mount *mp; 639 fsctlop_t op; 640 struct sysctl_req *req; 641 { 642 643 return (EOPNOTSUPP); 644 } 645 646 /* end of vfs default ops */ 647