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_lock1 = 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 .vop_vptofh = vop_stdvptofh, 100 }; 101 102 /* 103 * Series of placeholder functions for various error returns for 104 * VOPs. 105 */ 106 107 int 108 vop_eopnotsupp(struct vop_generic_args *ap) 109 { 110 /* 111 printf("vop_notsupp[%s]\n", ap->a_desc->vdesc_name); 112 */ 113 114 return (EOPNOTSUPP); 115 } 116 117 int 118 vop_ebadf(struct vop_generic_args *ap) 119 { 120 121 return (EBADF); 122 } 123 124 int 125 vop_enotty(struct vop_generic_args *ap) 126 { 127 128 return (ENOTTY); 129 } 130 131 int 132 vop_einval(struct vop_generic_args *ap) 133 { 134 135 return (EINVAL); 136 } 137 138 int 139 vop_null(struct vop_generic_args *ap) 140 { 141 142 return (0); 143 } 144 145 /* 146 * Helper function to panic on some bad VOPs in some filesystems. 147 */ 148 int 149 vop_panic(struct vop_generic_args *ap) 150 { 151 152 panic("filesystem goof: vop_panic[%s]", ap->a_desc->vdesc_name); 153 } 154 155 /* 156 * vop_std<something> and vop_no<something> are default functions for use by 157 * filesystems that need the "default reasonable" implementation for a 158 * particular operation. 159 * 160 * The documentation for the operations they implement exists (if it exists) 161 * in the VOP_<SOMETHING>(9) manpage (all uppercase). 162 */ 163 164 /* 165 * Default vop for filesystems that do not support name lookup 166 */ 167 static int 168 vop_nolookup(ap) 169 struct vop_lookup_args /* { 170 struct vnode *a_dvp; 171 struct vnode **a_vpp; 172 struct componentname *a_cnp; 173 } */ *ap; 174 { 175 176 *ap->a_vpp = NULL; 177 return (ENOTDIR); 178 } 179 180 /* 181 * vop_nostrategy: 182 * 183 * Strategy routine for VFS devices that have none. 184 * 185 * BIO_ERROR and B_INVAL must be cleared prior to calling any strategy 186 * routine. Typically this is done for a BIO_READ strategy call. 187 * Typically B_INVAL is assumed to already be clear prior to a write 188 * and should not be cleared manually unless you just made the buffer 189 * invalid. BIO_ERROR should be cleared either way. 190 */ 191 192 static int 193 vop_nostrategy (struct vop_strategy_args *ap) 194 { 195 printf("No strategy for buffer at %p\n", ap->a_bp); 196 vprint("vnode", ap->a_vp); 197 ap->a_bp->b_ioflags |= BIO_ERROR; 198 ap->a_bp->b_error = EOPNOTSUPP; 199 bufdone(ap->a_bp); 200 return (EOPNOTSUPP); 201 } 202 203 /* 204 * vop_stdpathconf: 205 * 206 * Standard implementation of POSIX pathconf, to get information about limits 207 * for a filesystem. 208 * Override per filesystem for the case where the filesystem has smaller 209 * limits. 210 */ 211 int 212 vop_stdpathconf(ap) 213 struct vop_pathconf_args /* { 214 struct vnode *a_vp; 215 int a_name; 216 int *a_retval; 217 } */ *ap; 218 { 219 220 switch (ap->a_name) { 221 case _PC_NAME_MAX: 222 *ap->a_retval = NAME_MAX; 223 return (0); 224 case _PC_PATH_MAX: 225 *ap->a_retval = PATH_MAX; 226 return (0); 227 case _PC_LINK_MAX: 228 *ap->a_retval = LINK_MAX; 229 return (0); 230 case _PC_MAX_CANON: 231 *ap->a_retval = MAX_CANON; 232 return (0); 233 case _PC_MAX_INPUT: 234 *ap->a_retval = MAX_INPUT; 235 return (0); 236 case _PC_PIPE_BUF: 237 *ap->a_retval = PIPE_BUF; 238 return (0); 239 case _PC_CHOWN_RESTRICTED: 240 *ap->a_retval = 1; 241 return (0); 242 case _PC_VDISABLE: 243 *ap->a_retval = _POSIX_VDISABLE; 244 return (0); 245 default: 246 return (EINVAL); 247 } 248 /* NOTREACHED */ 249 } 250 251 /* 252 * Standard lock, unlock and islocked functions. 253 */ 254 int 255 vop_stdlock(ap) 256 struct vop_lock1_args /* { 257 struct vnode *a_vp; 258 int a_flags; 259 char *file; 260 int line; 261 } */ *ap; 262 { 263 struct vnode *vp = ap->a_vp; 264 265 return (_lockmgr_args(vp->v_vnlock, ap->a_flags, VI_MTX(vp), 266 LK_WMESG_DEFAULT, LK_PRIO_DEFAULT, LK_TIMO_DEFAULT, ap->a_file, 267 ap->a_line)); 268 } 269 270 /* See above. */ 271 int 272 vop_stdunlock(ap) 273 struct vop_unlock_args /* { 274 struct vnode *a_vp; 275 int a_flags; 276 } */ *ap; 277 { 278 struct vnode *vp = ap->a_vp; 279 280 return (lockmgr(vp->v_vnlock, ap->a_flags | LK_RELEASE, VI_MTX(vp))); 281 } 282 283 /* See above. */ 284 int 285 vop_stdislocked(ap) 286 struct vop_islocked_args /* { 287 struct vnode *a_vp; 288 } */ *ap; 289 { 290 291 return (lockstatus(ap->a_vp->v_vnlock)); 292 } 293 294 /* 295 * Return true for select/poll. 296 */ 297 int 298 vop_nopoll(ap) 299 struct vop_poll_args /* { 300 struct vnode *a_vp; 301 int a_events; 302 struct ucred *a_cred; 303 struct thread *a_td; 304 } */ *ap; 305 { 306 /* 307 * Return true for read/write. If the user asked for something 308 * special, return POLLNVAL, so that clients have a way of 309 * determining reliably whether or not the extended 310 * functionality is present without hard-coding knowledge 311 * of specific filesystem implementations. 312 * Stay in sync with kern_conf.c::no_poll(). 313 */ 314 if (ap->a_events & ~POLLSTANDARD) 315 return (POLLNVAL); 316 317 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 318 } 319 320 /* 321 * Implement poll for local filesystems that support it. 322 */ 323 int 324 vop_stdpoll(ap) 325 struct vop_poll_args /* { 326 struct vnode *a_vp; 327 int a_events; 328 struct ucred *a_cred; 329 struct thread *a_td; 330 } */ *ap; 331 { 332 if (ap->a_events & ~POLLSTANDARD) 333 return (vn_pollrecord(ap->a_vp, ap->a_td, ap->a_events)); 334 return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); 335 } 336 337 /* 338 * Return our mount point, as we will take charge of the writes. 339 */ 340 int 341 vop_stdgetwritemount(ap) 342 struct vop_getwritemount_args /* { 343 struct vnode *a_vp; 344 struct mount **a_mpp; 345 } */ *ap; 346 { 347 struct mount *mp; 348 349 /* 350 * XXX Since this is called unlocked we may be recycled while 351 * attempting to ref the mount. If this is the case or mountpoint 352 * will be set to NULL. We only have to prevent this call from 353 * returning with a ref to an incorrect mountpoint. It is not 354 * harmful to return with a ref to our previous mountpoint. 355 */ 356 mp = ap->a_vp->v_mount; 357 if (mp != NULL) { 358 vfs_ref(mp); 359 if (mp != ap->a_vp->v_mount) { 360 vfs_rel(mp); 361 mp = NULL; 362 } 363 } 364 *(ap->a_mpp) = mp; 365 return (0); 366 } 367 368 /* XXX Needs good comment and VOP_BMAP(9) manpage */ 369 int 370 vop_stdbmap(ap) 371 struct vop_bmap_args /* { 372 struct vnode *a_vp; 373 daddr_t a_bn; 374 struct bufobj **a_bop; 375 daddr_t *a_bnp; 376 int *a_runp; 377 int *a_runb; 378 } */ *ap; 379 { 380 381 if (ap->a_bop != NULL) 382 *ap->a_bop = &ap->a_vp->v_bufobj; 383 if (ap->a_bnp != NULL) 384 *ap->a_bnp = ap->a_bn * btodb(ap->a_vp->v_mount->mnt_stat.f_iosize); 385 if (ap->a_runp != NULL) 386 *ap->a_runp = 0; 387 if (ap->a_runb != NULL) 388 *ap->a_runb = 0; 389 return (0); 390 } 391 392 int 393 vop_stdfsync(ap) 394 struct vop_fsync_args /* { 395 struct vnode *a_vp; 396 struct ucred *a_cred; 397 int a_waitfor; 398 struct thread *a_td; 399 } */ *ap; 400 { 401 struct vnode *vp = ap->a_vp; 402 struct buf *bp; 403 struct bufobj *bo; 404 struct buf *nbp; 405 int error = 0; 406 int maxretry = 1000; /* large, arbitrarily chosen */ 407 408 bo = &vp->v_bufobj; 409 BO_LOCK(bo); 410 loop1: 411 /* 412 * MARK/SCAN initialization to avoid infinite loops. 413 */ 414 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) { 415 bp->b_vflags &= ~BV_SCANNED; 416 bp->b_error = 0; 417 } 418 419 /* 420 * Flush all dirty buffers associated with a vnode. 421 */ 422 loop2: 423 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 424 if ((bp->b_vflags & BV_SCANNED) != 0) 425 continue; 426 bp->b_vflags |= BV_SCANNED; 427 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) 428 continue; 429 BO_UNLOCK(bo); 430 KASSERT(bp->b_bufobj == bo, 431 ("bp %p wrong b_bufobj %p should be %p", 432 bp, bp->b_bufobj, bo)); 433 if ((bp->b_flags & B_DELWRI) == 0) 434 panic("fsync: not dirty"); 435 if ((vp->v_object != NULL) && (bp->b_flags & B_CLUSTEROK)) { 436 vfs_bio_awrite(bp); 437 } else { 438 bremfree(bp); 439 bawrite(bp); 440 } 441 BO_LOCK(bo); 442 goto loop2; 443 } 444 445 /* 446 * If synchronous the caller expects us to completely resolve all 447 * dirty buffers in the system. Wait for in-progress I/O to 448 * complete (which could include background bitmap writes), then 449 * retry if dirty blocks still exist. 450 */ 451 if (ap->a_waitfor == MNT_WAIT) { 452 bufobj_wwait(bo, 0, 0); 453 if (bo->bo_dirty.bv_cnt > 0) { 454 /* 455 * If we are unable to write any of these buffers 456 * then we fail now rather than trying endlessly 457 * to write them out. 458 */ 459 TAILQ_FOREACH(bp, &bo->bo_dirty.bv_hd, b_bobufs) 460 if ((error = bp->b_error) == 0) 461 continue; 462 if (error == 0 && --maxretry >= 0) 463 goto loop1; 464 error = EAGAIN; 465 } 466 } 467 BO_UNLOCK(bo); 468 if (error == EAGAIN) 469 vprint("fsync: giving up on dirty", vp); 470 471 return (error); 472 } 473 474 /* XXX Needs good comment and more info in the manpage (VOP_GETPAGES(9)). */ 475 int 476 vop_stdgetpages(ap) 477 struct vop_getpages_args /* { 478 struct vnode *a_vp; 479 vm_page_t *a_m; 480 int a_count; 481 int a_reqpage; 482 vm_ooffset_t a_offset; 483 } */ *ap; 484 { 485 486 return vnode_pager_generic_getpages(ap->a_vp, ap->a_m, 487 ap->a_count, ap->a_reqpage); 488 } 489 490 int 491 vop_stdkqfilter(struct vop_kqfilter_args *ap) 492 { 493 return vfs_kqfilter(ap); 494 } 495 496 /* XXX Needs good comment and more info in the manpage (VOP_PUTPAGES(9)). */ 497 int 498 vop_stdputpages(ap) 499 struct vop_putpages_args /* { 500 struct vnode *a_vp; 501 vm_page_t *a_m; 502 int a_count; 503 int a_sync; 504 int *a_rtvals; 505 vm_ooffset_t a_offset; 506 } */ *ap; 507 { 508 509 return vnode_pager_generic_putpages(ap->a_vp, ap->a_m, ap->a_count, 510 ap->a_sync, ap->a_rtvals); 511 } 512 513 int 514 vop_stdvptofh(struct vop_vptofh_args *ap) 515 { 516 return (EOPNOTSUPP); 517 } 518 519 /* 520 * vfs default ops 521 * used to fill the vfs function table to get reasonable default return values. 522 */ 523 int 524 vfs_stdroot (mp, flags, vpp, td) 525 struct mount *mp; 526 int flags; 527 struct vnode **vpp; 528 struct thread *td; 529 { 530 531 return (EOPNOTSUPP); 532 } 533 534 int 535 vfs_stdstatfs (mp, sbp, td) 536 struct mount *mp; 537 struct statfs *sbp; 538 struct thread *td; 539 { 540 541 return (EOPNOTSUPP); 542 } 543 544 int 545 vfs_stdquotactl (mp, cmds, uid, arg, td) 546 struct mount *mp; 547 int cmds; 548 uid_t uid; 549 void *arg; 550 struct thread *td; 551 { 552 553 return (EOPNOTSUPP); 554 } 555 556 int 557 vfs_stdsync(mp, waitfor, td) 558 struct mount *mp; 559 int waitfor; 560 struct thread *td; 561 { 562 struct vnode *vp, *mvp; 563 int error, lockreq, allerror = 0; 564 565 lockreq = LK_EXCLUSIVE | LK_INTERLOCK; 566 if (waitfor != MNT_WAIT) 567 lockreq |= LK_NOWAIT; 568 /* 569 * Force stale buffer cache information to be flushed. 570 */ 571 MNT_ILOCK(mp); 572 loop: 573 MNT_VNODE_FOREACH(vp, mp, mvp) { 574 /* bv_cnt is an acceptable race here. */ 575 if (vp->v_bufobj.bo_dirty.bv_cnt == 0) 576 continue; 577 VI_LOCK(vp); 578 MNT_IUNLOCK(mp); 579 if ((error = vget(vp, lockreq, td)) != 0) { 580 MNT_ILOCK(mp); 581 if (error == ENOENT) { 582 MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp); 583 goto loop; 584 } 585 continue; 586 } 587 error = VOP_FSYNC(vp, waitfor, td); 588 if (error) 589 allerror = error; 590 591 /* Do not turn this into vput. td is not always curthread. */ 592 VOP_UNLOCK(vp, 0); 593 vrele(vp); 594 MNT_ILOCK(mp); 595 } 596 MNT_IUNLOCK(mp); 597 return (allerror); 598 } 599 600 int 601 vfs_stdnosync (mp, waitfor, td) 602 struct mount *mp; 603 int waitfor; 604 struct thread *td; 605 { 606 607 return (0); 608 } 609 610 int 611 vfs_stdvget (mp, ino, flags, vpp) 612 struct mount *mp; 613 ino_t ino; 614 int flags; 615 struct vnode **vpp; 616 { 617 618 return (EOPNOTSUPP); 619 } 620 621 int 622 vfs_stdfhtovp (mp, fhp, vpp) 623 struct mount *mp; 624 struct fid *fhp; 625 struct vnode **vpp; 626 { 627 628 return (EOPNOTSUPP); 629 } 630 631 int 632 vfs_stdinit (vfsp) 633 struct vfsconf *vfsp; 634 { 635 636 return (0); 637 } 638 639 int 640 vfs_stduninit (vfsp) 641 struct vfsconf *vfsp; 642 { 643 644 return(0); 645 } 646 647 int 648 vfs_stdextattrctl(mp, cmd, filename_vp, attrnamespace, attrname, td) 649 struct mount *mp; 650 int cmd; 651 struct vnode *filename_vp; 652 int attrnamespace; 653 const char *attrname; 654 struct thread *td; 655 { 656 657 if (filename_vp != NULL) 658 VOP_UNLOCK(filename_vp, 0); 659 return (EOPNOTSUPP); 660 } 661 662 int 663 vfs_stdsysctl(mp, op, req) 664 struct mount *mp; 665 fsctlop_t op; 666 struct sysctl_req *req; 667 { 668 669 return (EOPNOTSUPP); 670 } 671 672 /* end of vfs default ops */ 673