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/event.h> 44 #include <sys/kernel.h> 45 #include <sys/limits.h> 46 #include <sys/lock.h> 47 #include <sys/malloc.h> 48 #include <sys/mount.h> 49 #include <sys/mutex.h> 50 #include <sys/unistd.h> 51 #include <sys/vnode.h> 52 #include <sys/poll.h> 53 54 #include <vm/vm.h> 55 #include <vm/vm_object.h> 56 #include <vm/vm_extern.h> 57 #include <vm/pmap.h> 58 #include <vm/vm_map.h> 59 #include <vm/vm_page.h> 60 #include <vm/vm_pager.h> 61 #include <vm/vnode_pager.h> 62 63 static int vop_nolookup(struct vop_lookup_args *); 64 static int vop_nostrategy(struct vop_strategy_args *); 65 66 /* 67 * This vnode table stores what we want to do if the filesystem doesn't 68 * implement a particular VOP. 69 * 70 * If there is no specific entry here, we will return EOPNOTSUPP. 71 * 72 */ 73 74 struct vop_vector default_vnodeops = { 75 .vop_default = NULL, 76 .vop_bypass = VOP_EOPNOTSUPP, 77 78 .vop_advlock = VOP_EINVAL, 79 .vop_bmap = vop_stdbmap, 80 .vop_close = VOP_NULL, 81 .vop_fsync = VOP_NULL, 82 .vop_getpages = vop_stdgetpages, 83 .vop_getwritemount = vop_stdgetwritemount, 84 .vop_inactive = VOP_NULL, 85 .vop_ioctl = VOP_ENOTTY, 86 .vop_kqfilter = vop_stdkqfilter, 87 .vop_islocked = vop_stdislocked, 88 .vop_lease = VOP_NULL, 89 .vop_lock = vop_stdlock, 90 .vop_lookup = vop_nolookup, 91 .vop_open = VOP_NULL, 92 .vop_pathconf = VOP_EINVAL, 93 .vop_poll = vop_nopoll, 94 .vop_putpages = vop_stdputpages, 95 .vop_readlink = VOP_EINVAL, 96 .vop_revoke = VOP_PANIC, 97 .vop_strategy = vop_nostrategy, 98 .vop_unlock = vop_stdunlock, 99 }; 100 101 /* 102 * Series of placeholder functions for various error returns for 103 * VOPs. 104 */ 105 106 int 107 vop_eopnotsupp(struct vop_generic_args *ap) 108 { 109 /* 110 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 111 */ 112 113 return (EOPNOTSUPP); 114 } 115 116 int 117 vop_ebadf(struct vop_generic_args *ap) 118 { 119 120 return (EBADF); 121 } 122 123 int 124 vop_enotty(struct vop_generic_args *ap) 125 { 126 127 return (ENOTTY); 128 } 129 130 int 131 vop_einval(struct vop_generic_args *ap) 132 { 133 134 return (EINVAL); 135 } 136 137 int 138 vop_null(struct vop_generic_args *ap) 139 { 140 141 return (0); 142 } 143 144 /* 145 * Helper function to panic on some bad VOPs in some filesystems. 146 */ 147 int 148 vop_panic(struct vop_generic_args *ap) 149 { 150 151 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 152 } 153 154 /* 155 * vop_std<something> and vop_no<something> are default functions for use by 156 * filesystems that need the "default reasonable" implementation for a 157 * particular operation. 158 * 159 * The documentation for the operations they implement exists (if it exists) 160 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 161 */ 162 163 /* 164 * Default vop for filesystems that do not support name lookup 165 */ 166 static int 167 vop_nolookup(ap) 168 struct vop_lookup_args /* { 169 struct vnode *a_dvp; 170 struct vnode **a_vpp; 171 struct componentname *a_cnp; 172 } */ *ap; 173 { 174 175 *ap->a_vpp = NULL; 176 return (ENOTDIR); 177 } 178 179 /* 180 * vop_nostrategy: 181 * 182 * Strategy routine for VFS devices that have none. 183 * 184 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 185 * routine. Typically this is done for a BIO_READ strategy call. 186 * Typically B_INVAL is assumed to already be clear prior to a write 187 * and should not be cleared manually unless you just made the buffer 188 * invalid. BIO_ERROR should be cleared either way. 189 */ 190 191 static int 192 vop_nostrategy (struct vop_strategy_args *ap) 193 { 194 printf("No strategy for buffer at %p\n", ap->a_bp); 195 vprint("vnode", ap->a_vp); 196 ap->a_bp->b_ioflags |= BIO_ERROR; 197 ap->a_bp->b_error = EOPNOTSUPP; 198 bufdone(ap->a_bp); 199 return (EOPNOTSUPP); 200 } 201 202 /* 203 * vop_stdpathconf: 204 * 205 * Standard implementation of POSIX pathconf, to get information about limits 206 * for a filesystem. 207 * Override per filesystem for the case where the filesystem has smaller 208 * limits. 209 */ 210 int 211 vop_stdpathconf(ap) 212 struct vop_pathconf_args /* { 213 struct vnode *a_vp; 214 int a_name; 215 int *a_retval; 216 } */ *ap; 217 { 218 219 switch (ap->a_name) { 220 case _PC_NAME_MAX: 221 *ap->a_retval = NAME_MAX; 222 return (0); 223 case _PC_PATH_MAX: 224 *ap->a_retval = PATH_MAX; 225 return (0); 226 case _PC_LINK_MAX: 227 *ap->a_retval = LINK_MAX; 228 return (0); 229 case _PC_MAX_CANON: 230 *ap->a_retval = MAX_CANON; 231 return (0); 232 case _PC_MAX_INPUT: 233 *ap->a_retval = MAX_INPUT; 234 return (0); 235 case _PC_PIPE_BUF: 236 *ap->a_retval = PIPE_BUF; 237 return (0); 238 case _PC_CHOWN_RESTRICTED: 239 *ap->a_retval = 1; 240 return (0); 241 case _PC_VDISABLE: 242 *ap->a_retval = _POSIX_VDISABLE; 243 return (0); 244 default: 245 return (EINVAL); 246 } 247 /* NOTREACHED */ 248 } 249 250 /* 251 * Standard lock, unlock and islocked functions. 252 */ 253 int 254 vop_stdlock(ap) 255 struct vop_lock_args /* { 256 struct vnode *a_vp; 257 int a_flags; 258 struct thread *a_td; 259 } */ *ap; 260 { 261 struct vnode *vp = ap->a_vp; 262 263 return (lockmgr(vp->v_vnlock, ap->a_flags, VI_MTX(vp), ap->a_td)); 264 } 265 266 /* See above. */ 267 int 268 vop_stdunlock(ap) 269 struct vop_unlock_args /* { 270 struct vnode *a_vp; 271 int a_flags; 272 struct thread *a_td; 273 } */ *ap; 274 { 275 struct vnode *vp = ap->a_vp; 276 277 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp), 278 ap->a_td)); 279 } 280 281 /* See above. */ 282 int 283 vop_stdislocked(ap) 284 struct vop_islocked_args /* { 285 struct vnode *a_vp; 286 struct thread *a_td; 287 } */ *ap; 288 { 289 290 return (lockstatus(ap->a_vp->v_vnlock, ap->a_td)); 291 } 292 293 /* 294 * Return true for select/poll. 295 */ 296 int 297 vop_nopoll(ap) 298 struct vop_poll_args /* { 299 struct vnode *a_vp; 300 int a_events; 301 struct ucred *a_cred; 302 struct thread *a_td; 303 } */ *ap; 304 { 305 /* 306 * Return true for read/write. If the user asked for something 307 * special, return POLLNVAL, so that clients have a way of 308 * determining reliably whether or not the extended 309 * functionality is present without hard-coding knowledge 310 * of specific filesystem implementations. 311 * Stay in sync with kern_conf.c::no_poll(). 312 */ 313 if (ap->a_events & ~POLLSTANDARD) 314 return (POLLNVAL); 315 316 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 317 } 318 319 /* 320 * Implement poll for local filesystems that support it. 321 */ 322 int 323 vop_stdpoll(ap) 324 struct vop_poll_args /* { 325 struct vnode *a_vp; 326 int a_events; 327 struct ucred *a_cred; 328 struct thread *a_td; 329 } */ *ap; 330 { 331 if (ap->a_events & ~POLLSTANDARD) 332 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 333 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 334 } 335 336 /* 337 * Return our mount point, as we will take charge of the writes. 338 */ 339 int 340 vop_stdgetwritemount(ap) 341 struct vop_getwritemount_args /* { 342 struct vnode *a_vp; 343 struct mount **a_mpp; 344 } */ *ap; 345 { 346 struct mount *mp; 347 348 /* 349 * XXX Since this is called unlocked we may be recycled while 350 * attempting to ref the mount. If this is the case or mountpoint 351 * will be set to NULL. We only have to prevent this call from 352 * returning with a ref to an incorrect mountpoint. It is not 353 * harmful to return with a ref to our previous mountpoint. 354 */ 355 mp = ap->a_vp->v_mount; 356 if (mp != NULL) { 357 vfs_ref(mp); 358 if (mp != ap->a_vp->v_mount) { 359 vfs_rel(mp); 360 mp = NULL; 361 } 362 } 363 *(ap->a_mpp) = mp; 364 return (0); 365 } 366 367 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 368 int 369 vop_stdbmap(ap) 370 struct vop_bmap_args /* { 371 struct vnode *a_vp; 372 daddr_t a_bn; 373 struct bufobj **a_bop; 374 daddr_t *a_bnp; 375 int *a_runp; 376 int *a_runb; 377 } */ *ap; 378 { 379 380 if (ap->a_bop != NULL) 381 *ap->a_bop = &ap->a_vp->v_bufobj; 382 if (ap->a_bnp != NULL) 383 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 384 if (ap->a_runp != NULL) 385 *ap->a_runp = 0; 386 if (ap->a_runb != NULL) 387 *ap->a_runb = 0; 388 return (0); 389 } 390 391 int 392 vop_stdfsync(ap) 393 struct vop_fsync_args /* { 394 struct vnode *a_vp; 395 struct ucred *a_cred; 396 int a_waitfor; 397 struct thread *a_td; 398 } */ *ap; 399 { 400 struct vnode *vp = ap->a_vp; 401 struct buf *bp; 402 struct bufobj *bo; 403 struct buf *nbp; 404 int error = 0; 405 int maxretry = 1000; /* large, arbitrarily chosen */ 406 407 VI_LOCK(vp); 408 loop1: 409 /* 410 * MARK/SCAN initialization to avoid infinite loops. 411 */ 412 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs) { 413 bp->b_vflags &= ~BV_SCANNED; 414 bp->b_error = 0; 415 } 416 417 /* 418 * Flush all dirty buffers associated with a vnode. 419 */ 420 loop2: 421 TAILQ_FOREACH_SAFE(bp, &vp->v_bufobj.bo_dirty.bv_hd, b_bobufs, nbp) { 422 if ((bp->b_vflags & BV_SCANNED) != 0) 423 continue; 424 bp->b_vflags |= BV_SCANNED; 425 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 426 continue; 427 VI_UNLOCK(vp); 428 KASSERT(bp->b_bufobj == &vp->v_bufobj, 429 ("bp %p wrong b_bufobj %p should be %p", 430 bp, bp->b_bufobj, &vp->v_bufobj)); 431 if ((bp->b_flags & B_DELWRI) == 0) 432 panic("fsync: not dirty"); 433 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 434 vfs_bio_awrite(bp); 435 } else { 436 bremfree(bp); 437 bawrite(bp); 438 } 439 VI_LOCK(vp); 440 goto loop2; 441 } 442 443 /* 444 * If synchronous the caller expects us to completely resolve all 445 * dirty buffers in the system. Wait for in-progress I/O to 446 * complete (which could include background bitmap writes), then 447 * retry if dirty blocks still exist. 448 */ 449 if (ap->a_waitfor == MNT_WAIT) { 450 bo = &vp->v_bufobj; 451 bufobj_wwait(bo, 0, 0); 452 if (bo->bo_dirty.bv_cnt > 0) { 453 /* 454 * If we are unable to write any of these buffers 455 * then we fail now rather than trying endlessly 456 * to write them out. 457 */ 458 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 459 if ((error = bp->b_error) == 0) 460 continue; 461 if (error == 0 && --maxretry >= 0) 462 goto loop1; 463 error = EAGAIN; 464 } 465 } 466 VI_UNLOCK(vp); 467 if (error == EAGAIN) 468 vprint("fsync: giving up on dirty", vp); 469 470 return (error); 471 } 472 473 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 474 int 475 vop_stdgetpages(ap) 476 struct vop_getpages_args /* { 477 struct vnode *a_vp; 478 vm_page_t *a_m; 479 int a_count; 480 int a_reqpage; 481 vm_ooffset_t a_offset; 482 } */ *ap; 483 { 484 485 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 486 ap->a_count, ap->a_reqpage); 487 } 488 489 int 490 vop_stdkqfilter(struct vop_kqfilter_args *ap) 491 { 492 return vfs_kqfilter(ap); 493 } 494 495 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 496 int 497 vop_stdputpages(ap) 498 struct vop_putpages_args /* { 499 struct vnode *a_vp; 500 vm_page_t *a_m; 501 int a_count; 502 int a_sync; 503 int *a_rtvals; 504 vm_ooffset_t a_offset; 505 } */ *ap; 506 { 507 508 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 509 ap->a_sync, ap->a_rtvals); 510 } 511 512 /* 513 * vfs default ops 514 * used to fill the vfs function table to get reasonable default return values. 515 */ 516 int 517 vfs_stdroot (mp, flags, vpp, td) 518 struct mount *mp; 519 int flags; 520 struct vnode **vpp; 521 struct thread *td; 522 { 523 524 return (EOPNOTSUPP); 525 } 526 527 int 528 vfs_stdstatfs (mp, sbp, td) 529 struct mount *mp; 530 struct statfs *sbp; 531 struct thread *td; 532 { 533 534 return (EOPNOTSUPP); 535 } 536 537 int 538 vfs_stdvptofh (vp, fhp) 539 struct vnode *vp; 540 struct fid *fhp; 541 { 542 543 return (EOPNOTSUPP); 544 } 545 546 int 547 vfs_stdquotactl (mp, cmds, uid, arg, td) 548 struct mount *mp; 549 int cmds; 550 uid_t uid; 551 void *arg; 552 struct thread *td; 553 { 554 555 return (EOPNOTSUPP); 556 } 557 558 int 559 vfs_stdsync(mp, waitfor, td) 560 struct mount *mp; 561 int waitfor; 562 struct thread *td; 563 { 564 struct vnode *vp, *mvp; 565 int error, lockreq, allerror = 0; 566 567 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 568 if (waitfor != MNT_WAIT) 569 lockreq |= LK_NOWAIT; 570 /* 571 * Force stale buffer cache information to be flushed. 572 */ 573 MNT_ILOCK(mp); 574 loop: 575 MNT_VNODE_FOREACH(vp, mp, mvp) { 576 577 VI_LOCK(vp); 578 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) { 579 VI_UNLOCK(vp); 580 continue; 581 } 582 MNT_IUNLOCK(mp); 583 584 if ((error = vget(vp, lockreq, td)) != 0) { 585 MNT_ILOCK(mp); 586 if (error == ENOENT) { 587 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 588 goto loop; 589 } 590 continue; 591 } 592 error = VOP_FSYNC(vp, waitfor, td); 593 if (error) 594 allerror = error; 595 596 /* Do not turn this into vput. td is not always curthread. */ 597 VOP_UNLOCK(vp, 0, td); 598 vrele(vp); 599 MNT_ILOCK(mp); 600 } 601 MNT_IUNLOCK(mp); 602 return (allerror); 603 } 604 605 int 606 vfs_stdnosync (mp, waitfor, td) 607 struct mount *mp; 608 int waitfor; 609 struct thread *td; 610 { 611 612 return (0); 613 } 614 615 int 616 vfs_stdvget (mp, ino, flags, vpp) 617 struct mount *mp; 618 ino_t ino; 619 int flags; 620 struct vnode **vpp; 621 { 622 623 return (EOPNOTSUPP); 624 } 625 626 int 627 vfs_stdfhtovp (mp, fhp, vpp) 628 struct mount *mp; 629 struct fid *fhp; 630 struct vnode **vpp; 631 { 632 633 return (EOPNOTSUPP); 634 } 635 636 int 637 vfs_stdinit (vfsp) 638 struct vfsconf *vfsp; 639 { 640 641 return (0); 642 } 643 644 int 645 vfs_stduninit (vfsp) 646 struct vfsconf *vfsp; 647 { 648 649 return(0); 650 } 651 652 int 653 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td) 654 struct mount *mp; 655 int cmd; 656 struct vnode *filename_vp; 657 int attrnamespace; 658 const char *attrname; 659 struct thread *td; 660 { 661 662 if (filename_vp != NULL) 663 VOP_UNLOCK(filename_vp, 0, td); 664 return (EOPNOTSUPP); 665 } 666 667 int 668 vfs_stdsysctl(mp, op, req) 669 struct mount *mp; 670 fsctlop_t op; 671 struct sysctl_req *req; 672 { 673 674 return (EOPNOTSUPP); 675 } 676 677 /* end of vfs default ops */ 678