1 /* $OpenBSD: vfs_subr.c,v 1.288 2019/04/19 09:41:07 visa Exp $ */ 2 /* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94 38 */ 39 40 /* 41 * External virtual filesystem routines 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/sysctl.h> 48 #include <sys/mount.h> 49 #include <sys/time.h> 50 #include <sys/fcntl.h> 51 #include <sys/kernel.h> 52 #include <sys/conf.h> 53 #include <sys/vnode.h> 54 #include <sys/lock.h> 55 #include <sys/lockf.h> 56 #include <sys/stat.h> 57 #include <sys/acct.h> 58 #include <sys/namei.h> 59 #include <sys/ucred.h> 60 #include <sys/buf.h> 61 #include <sys/errno.h> 62 #include <sys/malloc.h> 63 #include <sys/mbuf.h> 64 #include <sys/syscallargs.h> 65 #include <sys/pool.h> 66 #include <sys/tree.h> 67 #include <sys/specdev.h> 68 #include <sys/atomic.h> 69 70 #include <netinet/in.h> 71 72 #include <uvm/uvm_extern.h> 73 #include <uvm/uvm_vnode.h> 74 75 #include "softraid.h" 76 77 void sr_quiesce(void); 78 79 enum vtype iftovt_tab[16] = { 80 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 81 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 82 }; 83 84 int vttoif_tab[9] = { 85 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 86 S_IFSOCK, S_IFIFO, S_IFMT, 87 }; 88 89 int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 90 int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */ 91 92 /* 93 * Insq/Remq for the vnode usage lists. 94 */ 95 #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 96 #define bufremvn(bp) { \ 97 LIST_REMOVE(bp, b_vnbufs); \ 98 LIST_NEXT(bp, b_vnbufs) = NOLIST; \ 99 } 100 101 struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 102 struct freelst vnode_free_list; /* vnode free list */ 103 104 struct mntlist mountlist; /* mounted filesystem list */ 105 106 void vclean(struct vnode *, int, struct proc *); 107 108 void insmntque(struct vnode *, struct mount *); 109 int getdevvp(dev_t, struct vnode **, enum vtype); 110 111 int vfs_hang_addrlist(struct mount *, struct netexport *, 112 struct export_args *); 113 int vfs_free_netcred(struct radix_node *, void *, u_int); 114 void vfs_free_addrlist(struct netexport *); 115 void vputonfreelist(struct vnode *); 116 117 int vflush_vnode(struct vnode *, void *); 118 int maxvnodes; 119 120 void vfs_unmountall(void); 121 122 #ifdef DEBUG 123 void printlockedvnodes(void); 124 #endif 125 126 struct pool vnode_pool; 127 struct pool uvm_vnode_pool; 128 129 static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 130 RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 131 132 static inline int 133 rb_buf_compare(const struct buf *b1, const struct buf *b2) 134 { 135 if (b1->b_lblkno < b2->b_lblkno) 136 return(-1); 137 if (b1->b_lblkno > b2->b_lblkno) 138 return(1); 139 return(0); 140 } 141 142 /* 143 * Initialize the vnode management data structures. 144 */ 145 void 146 vntblinit(void) 147 { 148 /* buffer cache may need a vnode for each buffer */ 149 maxvnodes = 2 * initialvnodes; 150 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 151 PR_WAITOK, "vnodes", NULL); 152 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 153 PR_WAITOK, "uvmvnodes", NULL); 154 TAILQ_INIT(&vnode_hold_list); 155 TAILQ_INIT(&vnode_free_list); 156 TAILQ_INIT(&mountlist); 157 /* 158 * Initialize the filesystem syncer. 159 */ 160 vn_initialize_syncerd(); 161 162 #ifdef NFSSERVER 163 rn_init(sizeof(struct sockaddr_in)); 164 #endif /* NFSSERVER */ 165 } 166 167 /* 168 * Allocate a mount point. 169 * 170 * The returned mount point is marked as busy. 171 */ 172 struct mount * 173 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp) 174 { 175 struct mount *mp; 176 177 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 178 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 179 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 180 181 LIST_INIT(&mp->mnt_vnodelist); 182 mp->mnt_vnodecovered = vp; 183 184 atomic_inc_int(&vfsp->vfc_refcount); 185 mp->mnt_vfc = vfsp; 186 mp->mnt_op = vfsp->vfc_vfsops; 187 mp->mnt_flag = vfsp->vfc_flags; 188 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 189 190 return (mp); 191 } 192 193 /* 194 * Release a mount point. 195 */ 196 void 197 vfs_mount_free(struct mount *mp) 198 { 199 atomic_dec_int(&mp->mnt_vfc->vfc_refcount); 200 free(mp, M_MOUNT, sizeof(*mp)); 201 } 202 203 /* 204 * Mark a mount point as busy. Used to synchronize access and to delay 205 * unmounting. 206 * 207 * Default behaviour is to attempt getting a READ lock and in case of an 208 * ongoing unmount, to wait for it to finish and then return failure. 209 */ 210 int 211 vfs_busy(struct mount *mp, int flags) 212 { 213 int rwflags = 0; 214 215 if (flags & VB_WRITE) 216 rwflags |= RW_WRITE; 217 else 218 rwflags |= RW_READ; 219 220 if (flags & VB_WAIT) 221 rwflags |= RW_SLEEPFAIL; 222 else 223 rwflags |= RW_NOSLEEP; 224 225 #ifdef WITNESS 226 if (flags & VB_DUPOK) 227 rwflags |= RW_DUPOK; 228 #endif 229 230 if (rw_enter(&mp->mnt_lock, rwflags)) 231 return (EBUSY); 232 233 return (0); 234 } 235 236 /* 237 * Free a busy file system 238 */ 239 void 240 vfs_unbusy(struct mount *mp) 241 { 242 rw_exit(&mp->mnt_lock); 243 } 244 245 int 246 vfs_isbusy(struct mount *mp) 247 { 248 if (RWLOCK_OWNER(&mp->mnt_lock) > 0) 249 return (1); 250 else 251 return (0); 252 } 253 254 /* 255 * Lookup a filesystem type, and if found allocate and initialize 256 * a mount structure for it. 257 * 258 * Devname is usually updated by mount(8) after booting. 259 */ 260 int 261 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 262 { 263 struct vfsconf *vfsp; 264 struct mount *mp; 265 266 vfsp = vfs_byname(fstypename); 267 if (vfsp == NULL) 268 return (ENODEV); 269 mp = vfs_mount_alloc(NULLVP, vfsp); 270 mp->mnt_flag |= MNT_RDONLY; 271 mp->mnt_stat.f_mntonname[0] = '/'; 272 copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN, 0); 273 copystr(devname, mp->mnt_stat.f_mntfromspec, MNAMELEN, 0); 274 *mpp = mp; 275 return (0); 276 } 277 278 /* 279 * Lookup a mount point by filesystem identifier. 280 */ 281 struct mount * 282 vfs_getvfs(fsid_t *fsid) 283 { 284 struct mount *mp; 285 286 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 287 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 288 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 289 return (mp); 290 } 291 } 292 293 return (NULL); 294 } 295 296 297 /* 298 * Get a new unique fsid 299 */ 300 void 301 vfs_getnewfsid(struct mount *mp) 302 { 303 static u_short xxxfs_mntid; 304 305 fsid_t tfsid; 306 int mtype; 307 308 mtype = mp->mnt_vfc->vfc_typenum; 309 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 310 mp->mnt_stat.f_fsid.val[1] = mtype; 311 if (xxxfs_mntid == 0) 312 ++xxxfs_mntid; 313 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 314 tfsid.val[1] = mtype; 315 if (!TAILQ_EMPTY(&mountlist)) { 316 while (vfs_getvfs(&tfsid)) { 317 tfsid.val[0]++; 318 xxxfs_mntid++; 319 } 320 } 321 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 322 } 323 324 /* 325 * Set vnode attributes to VNOVAL 326 */ 327 void 328 vattr_null(struct vattr *vap) 329 { 330 331 vap->va_type = VNON; 332 /* 333 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 334 * with 2^31-1 instead of 2^64-1. Just write'm out and let 335 * the compiler do its job. 336 */ 337 vap->va_mode = VNOVAL; 338 vap->va_nlink = VNOVAL; 339 vap->va_uid = VNOVAL; 340 vap->va_gid = VNOVAL; 341 vap->va_fsid = VNOVAL; 342 vap->va_fileid = VNOVAL; 343 vap->va_size = VNOVAL; 344 vap->va_blocksize = VNOVAL; 345 vap->va_atime.tv_sec = VNOVAL; 346 vap->va_atime.tv_nsec = VNOVAL; 347 vap->va_mtime.tv_sec = VNOVAL; 348 vap->va_mtime.tv_nsec = VNOVAL; 349 vap->va_ctime.tv_sec = VNOVAL; 350 vap->va_ctime.tv_nsec = VNOVAL; 351 vap->va_gen = VNOVAL; 352 vap->va_flags = VNOVAL; 353 vap->va_rdev = VNOVAL; 354 vap->va_bytes = VNOVAL; 355 vap->va_filerev = VNOVAL; 356 vap->va_vaflags = 0; 357 } 358 359 /* 360 * Routines having to do with the management of the vnode table. 361 */ 362 long numvnodes; 363 364 /* 365 * Return the next vnode from the free list. 366 */ 367 int 368 getnewvnode(enum vtagtype tag, struct mount *mp, struct vops *vops, 369 struct vnode **vpp) 370 { 371 struct proc *p = curproc; 372 struct freelst *listhd; 373 static int toggle; 374 struct vnode *vp; 375 int s; 376 377 /* 378 * allow maxvnodes to increase if the buffer cache itself 379 * is big enough to justify it. (we don't shrink it ever) 380 */ 381 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 382 : maxvnodes; 383 384 /* 385 * We must choose whether to allocate a new vnode or recycle an 386 * existing one. The criterion for allocating a new one is that 387 * the total number of vnodes is less than the number desired or 388 * there are no vnodes on either free list. Generally we only 389 * want to recycle vnodes that have no buffers associated with 390 * them, so we look first on the vnode_free_list. If it is empty, 391 * we next consider vnodes with referencing buffers on the 392 * vnode_hold_list. The toggle ensures that half the time we 393 * will use a buffer from the vnode_hold_list, and half the time 394 * we will allocate a new one unless the list has grown to twice 395 * the desired size. We are reticent to recycle vnodes from the 396 * vnode_hold_list because we will lose the identity of all its 397 * referencing buffers. 398 */ 399 toggle ^= 1; 400 if (numvnodes / 2 > maxvnodes) 401 toggle = 0; 402 403 s = splbio(); 404 if ((numvnodes < maxvnodes) || 405 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 406 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 407 splx(s); 408 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 409 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 410 vp->v_uvm->u_vnode = vp; 411 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 412 cache_tree_init(&vp->v_nc_tree); 413 TAILQ_INIT(&vp->v_cache_dst); 414 numvnodes++; 415 } else { 416 TAILQ_FOREACH(vp, listhd, v_freelist) { 417 if (VOP_ISLOCKED(vp) == 0) 418 break; 419 } 420 /* 421 * Unless this is a bad time of the month, at most 422 * the first NCPUS items on the free list are 423 * locked, so this is close enough to being empty. 424 */ 425 if (vp == NULL) { 426 splx(s); 427 tablefull("vnode"); 428 *vpp = 0; 429 return (ENFILE); 430 } 431 432 #ifdef DIAGNOSTIC 433 if (vp->v_usecount) { 434 vprint("free vnode", vp); 435 panic("free vnode isn't"); 436 } 437 #endif 438 439 TAILQ_REMOVE(listhd, vp, v_freelist); 440 vp->v_bioflag &= ~VBIOONFREELIST; 441 splx(s); 442 443 if (vp->v_type != VBAD) 444 vgonel(vp, p); 445 #ifdef DIAGNOSTIC 446 if (vp->v_data) { 447 vprint("cleaned vnode", vp); 448 panic("cleaned vnode isn't"); 449 } 450 s = splbio(); 451 if (vp->v_numoutput) 452 panic("Clean vnode has pending I/O's"); 453 splx(s); 454 #endif 455 vp->v_flag = 0; 456 vp->v_socket = 0; 457 } 458 cache_purge(vp); 459 vp->v_type = VNON; 460 vp->v_tag = tag; 461 vp->v_op = vops; 462 insmntque(vp, mp); 463 *vpp = vp; 464 vp->v_usecount = 1; 465 vp->v_data = 0; 466 return (0); 467 } 468 469 /* 470 * Move a vnode from one mount queue to another. 471 */ 472 void 473 insmntque(struct vnode *vp, struct mount *mp) 474 { 475 /* 476 * Delete from old mount point vnode list, if on one. 477 */ 478 if (vp->v_mount != NULL) 479 LIST_REMOVE(vp, v_mntvnodes); 480 /* 481 * Insert into list of vnodes for the new mount point, if available. 482 */ 483 if ((vp->v_mount = mp) != NULL) 484 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 485 } 486 487 /* 488 * Create a vnode for a block device. 489 * Used for root filesystem, argdev, and swap areas. 490 * Also used for memory file system special devices. 491 */ 492 int 493 bdevvp(dev_t dev, struct vnode **vpp) 494 { 495 return (getdevvp(dev, vpp, VBLK)); 496 } 497 498 /* 499 * Create a vnode for a character device. 500 * Used for console handling. 501 */ 502 int 503 cdevvp(dev_t dev, struct vnode **vpp) 504 { 505 return (getdevvp(dev, vpp, VCHR)); 506 } 507 508 /* 509 * Create a vnode for a device. 510 * Used by bdevvp (block device) for root file system etc., 511 * and by cdevvp (character device) for console. 512 */ 513 int 514 getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 515 { 516 struct vnode *vp; 517 struct vnode *nvp; 518 int error; 519 520 if (dev == NODEV) { 521 *vpp = NULLVP; 522 return (0); 523 } 524 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 525 if (error) { 526 *vpp = NULLVP; 527 return (error); 528 } 529 vp = nvp; 530 vp->v_type = type; 531 if ((nvp = checkalias(vp, dev, NULL)) != 0) { 532 vput(vp); 533 vp = nvp; 534 } 535 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 536 vp->v_flag |= VISTTY; 537 *vpp = vp; 538 return (0); 539 } 540 541 /* 542 * Check to see if the new vnode represents a special device 543 * for which we already have a vnode (either because of 544 * bdevvp() or because of a different vnode representing 545 * the same block device). If such an alias exists, deallocate 546 * the existing contents and return the aliased vnode. The 547 * caller is responsible for filling it with its new contents. 548 */ 549 struct vnode * 550 checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 551 { 552 struct proc *p = curproc; 553 struct vnode *vp; 554 struct vnode **vpp; 555 556 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 557 return (NULLVP); 558 559 vpp = &speclisth[SPECHASH(nvp_rdev)]; 560 loop: 561 for (vp = *vpp; vp; vp = vp->v_specnext) { 562 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 563 continue; 564 } 565 /* 566 * Alias, but not in use, so flush it out. 567 */ 568 if (vp->v_usecount == 0) { 569 vgonel(vp, p); 570 goto loop; 571 } 572 if (vget(vp, LK_EXCLUSIVE)) { 573 goto loop; 574 } 575 break; 576 } 577 578 /* 579 * Common case is actually in the if statement 580 */ 581 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 582 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 583 M_WAITOK); 584 nvp->v_rdev = nvp_rdev; 585 nvp->v_hashchain = vpp; 586 nvp->v_specnext = *vpp; 587 nvp->v_specmountpoint = NULL; 588 nvp->v_speclockf = NULL; 589 nvp->v_specbitmap = NULL; 590 if (nvp->v_type == VCHR && 591 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 592 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 593 if (vp != NULLVP) 594 nvp->v_specbitmap = vp->v_specbitmap; 595 else 596 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 597 M_VNODE, M_WAITOK | M_ZERO); 598 } 599 *vpp = nvp; 600 if (vp != NULLVP) { 601 nvp->v_flag |= VALIASED; 602 vp->v_flag |= VALIASED; 603 vput(vp); 604 } 605 return (NULLVP); 606 } 607 608 /* 609 * This code is the uncommon case. It is called in case 610 * we found an alias that was VT_NON && vtype of VBLK 611 * This means we found a block device that was created 612 * using bdevvp. 613 * An example of such a vnode is the root partition device vnode 614 * created in ffs_mountroot. 615 * 616 * The vnodes created by bdevvp should not be aliased (why?). 617 */ 618 619 VOP_UNLOCK(vp); 620 vclean(vp, 0, p); 621 vp->v_op = nvp->v_op; 622 vp->v_tag = nvp->v_tag; 623 nvp->v_type = VNON; 624 insmntque(vp, mp); 625 return (vp); 626 } 627 628 /* 629 * Grab a particular vnode from the free list, increment its 630 * reference count and lock it. If the vnode lock bit is set, 631 * the vnode is being eliminated in vgone. In that case, we 632 * cannot grab it, so the process is awakened when the 633 * transition is completed, and an error code is returned to 634 * indicate that the vnode is no longer usable, possibly 635 * having been changed to a new file system type. 636 */ 637 int 638 vget(struct vnode *vp, int flags) 639 { 640 int error, s, onfreelist; 641 642 /* 643 * If the vnode is in the process of being cleaned out for 644 * another use, we wait for the cleaning to finish and then 645 * return failure. Cleaning is determined by checking that 646 * the VXLOCK flag is set. 647 */ 648 649 if (vp->v_flag & VXLOCK) { 650 if (flags & LK_NOWAIT) { 651 return (EBUSY); 652 } 653 654 vp->v_flag |= VXWANT; 655 tsleep(vp, PINOD, "vget", 0); 656 return (ENOENT); 657 } 658 659 onfreelist = vp->v_bioflag & VBIOONFREELIST; 660 if (vp->v_usecount == 0 && onfreelist) { 661 s = splbio(); 662 if (vp->v_holdcnt > 0) 663 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 664 else 665 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 666 vp->v_bioflag &= ~VBIOONFREELIST; 667 splx(s); 668 } 669 670 vp->v_usecount++; 671 if (flags & LK_TYPE_MASK) { 672 if ((error = vn_lock(vp, flags)) != 0) { 673 vp->v_usecount--; 674 if (vp->v_usecount == 0 && onfreelist) 675 vputonfreelist(vp); 676 } 677 return (error); 678 } 679 680 return (0); 681 } 682 683 684 /* Vnode reference. */ 685 void 686 vref(struct vnode *vp) 687 { 688 #ifdef DIAGNOSTIC 689 if (vp->v_usecount == 0) 690 panic("vref used where vget required"); 691 if (vp->v_type == VNON) 692 panic("vref on a VNON vnode"); 693 #endif 694 vp->v_usecount++; 695 } 696 697 void 698 vputonfreelist(struct vnode *vp) 699 { 700 int s; 701 struct freelst *lst; 702 703 s = splbio(); 704 #ifdef DIAGNOSTIC 705 if (vp->v_usecount != 0) 706 panic("Use count is not zero!"); 707 708 if (vp->v_bioflag & VBIOONFREELIST) { 709 vprint("vnode already on free list: ", vp); 710 panic("vnode already on free list"); 711 } 712 #endif 713 714 vp->v_bioflag |= VBIOONFREELIST; 715 vp->v_bioflag &= ~VBIOERROR; 716 717 if (vp->v_holdcnt > 0) 718 lst = &vnode_hold_list; 719 else 720 lst = &vnode_free_list; 721 722 if (vp->v_type == VBAD) 723 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 724 else 725 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 726 727 splx(s); 728 } 729 730 /* 731 * vput(), just unlock and vrele() 732 */ 733 void 734 vput(struct vnode *vp) 735 { 736 struct proc *p = curproc; 737 738 #ifdef DIAGNOSTIC 739 if (vp == NULL) 740 panic("vput: null vp"); 741 #endif 742 743 #ifdef DIAGNOSTIC 744 if (vp->v_usecount == 0) { 745 vprint("vput: bad ref count", vp); 746 panic("vput: ref cnt"); 747 } 748 #endif 749 vp->v_usecount--; 750 KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); 751 if (vp->v_usecount > 0) { 752 VOP_UNLOCK(vp); 753 return; 754 } 755 756 #ifdef DIAGNOSTIC 757 if (vp->v_writecount != 0) { 758 vprint("vput: bad writecount", vp); 759 panic("vput: v_writecount != 0"); 760 } 761 #endif 762 763 VOP_INACTIVE(vp, p); 764 765 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 766 vputonfreelist(vp); 767 } 768 769 /* 770 * Vnode release - use for active VNODES. 771 * If count drops to zero, call inactive routine and return to freelist. 772 * Returns 0 if it did not sleep. 773 */ 774 int 775 vrele(struct vnode *vp) 776 { 777 struct proc *p = curproc; 778 779 #ifdef DIAGNOSTIC 780 if (vp == NULL) 781 panic("vrele: null vp"); 782 #endif 783 #ifdef DIAGNOSTIC 784 if (vp->v_usecount == 0) { 785 vprint("vrele: bad ref count", vp); 786 panic("vrele: ref cnt"); 787 } 788 #endif 789 vp->v_usecount--; 790 if (vp->v_usecount > 0) { 791 return (0); 792 } 793 794 #ifdef DIAGNOSTIC 795 if (vp->v_writecount != 0) { 796 vprint("vrele: bad writecount", vp); 797 panic("vrele: v_writecount != 0"); 798 } 799 #endif 800 801 if (vn_lock(vp, LK_EXCLUSIVE)) { 802 #ifdef DIAGNOSTIC 803 vprint("vrele: cannot lock", vp); 804 #endif 805 return (1); 806 } 807 808 VOP_INACTIVE(vp, p); 809 810 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 811 vputonfreelist(vp); 812 return (1); 813 } 814 815 /* Page or buffer structure gets a reference. */ 816 void 817 vhold(struct vnode *vp) 818 { 819 /* 820 * If it is on the freelist and the hold count is currently 821 * zero, move it to the hold list. 822 */ 823 if ((vp->v_bioflag & VBIOONFREELIST) && 824 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 825 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 826 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 827 } 828 vp->v_holdcnt++; 829 } 830 831 /* Lose interest in a vnode. */ 832 void 833 vdrop(struct vnode *vp) 834 { 835 #ifdef DIAGNOSTIC 836 if (vp->v_holdcnt == 0) 837 panic("vdrop: zero holdcnt"); 838 #endif 839 840 vp->v_holdcnt--; 841 842 /* 843 * If it is on the holdlist and the hold count drops to 844 * zero, move it to the free list. 845 */ 846 if ((vp->v_bioflag & VBIOONFREELIST) && 847 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 848 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 849 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 850 } 851 } 852 853 /* 854 * Remove any vnodes in the vnode table belonging to mount point mp. 855 * 856 * If MNT_NOFORCE is specified, there should not be any active ones, 857 * return error if any are found (nb: this is a user error, not a 858 * system error). If MNT_FORCE is specified, detach any active vnodes 859 * that are found. 860 */ 861 #ifdef DEBUG 862 int busyprt = 0; /* print out busy vnodes */ 863 struct ctldebug debug1 = { "busyprt", &busyprt }; 864 #endif 865 866 int 867 vfs_mount_foreach_vnode(struct mount *mp, 868 int (*func)(struct vnode *, void *), void *arg) { 869 struct vnode *vp, *nvp; 870 int error = 0; 871 872 loop: 873 LIST_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 874 if (vp->v_mount != mp) 875 goto loop; 876 877 error = func(vp, arg); 878 879 if (error != 0) 880 break; 881 } 882 883 return (error); 884 } 885 886 struct vflush_args { 887 struct vnode *skipvp; 888 int busy; 889 int flags; 890 }; 891 892 int 893 vflush_vnode(struct vnode *vp, void *arg) 894 { 895 struct vflush_args *va = arg; 896 struct proc *p = curproc; 897 898 if (vp == va->skipvp) { 899 return (0); 900 } 901 902 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 903 return (0); 904 } 905 906 /* 907 * If WRITECLOSE is set, only flush out regular file 908 * vnodes open for writing. 909 */ 910 if ((va->flags & WRITECLOSE) && 911 (vp->v_writecount == 0 || vp->v_type != VREG)) { 912 return (0); 913 } 914 915 /* 916 * With v_usecount == 0, all we need to do is clear 917 * out the vnode data structures and we are done. 918 */ 919 if (vp->v_usecount == 0) { 920 vgonel(vp, p); 921 return (0); 922 } 923 924 /* 925 * If FORCECLOSE is set, forcibly close the vnode. 926 * For block or character devices, revert to an 927 * anonymous device. For all other files, just kill them. 928 */ 929 if (va->flags & FORCECLOSE) { 930 if (vp->v_type != VBLK && vp->v_type != VCHR) { 931 vgonel(vp, p); 932 } else { 933 vclean(vp, 0, p); 934 vp->v_op = &spec_vops; 935 insmntque(vp, NULL); 936 } 937 return (0); 938 } 939 940 /* 941 * If set, this is allowed to ignore vnodes which don't 942 * have changes pending to disk. 943 * XXX Might be nice to check per-fs "inode" flags, but 944 * generally the filesystem is sync'd already, right? 945 */ 946 if ((va->flags & IGNORECLEAN) && 947 LIST_EMPTY(&vp->v_dirtyblkhd)) 948 return (0); 949 950 #ifdef DEBUG 951 if (busyprt) 952 vprint("vflush: busy vnode", vp); 953 #endif 954 va->busy++; 955 return (0); 956 } 957 958 int 959 vflush(struct mount *mp, struct vnode *skipvp, int flags) 960 { 961 struct vflush_args va; 962 va.skipvp = skipvp; 963 va.busy = 0; 964 va.flags = flags; 965 966 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 967 968 if (va.busy) 969 return (EBUSY); 970 return (0); 971 } 972 973 /* 974 * Disassociate the underlying file system from a vnode. 975 */ 976 void 977 vclean(struct vnode *vp, int flags, struct proc *p) 978 { 979 int active; 980 981 /* 982 * Check to see if the vnode is in use. 983 * If so we have to reference it before we clean it out 984 * so that its count cannot fall to zero and generate a 985 * race against ourselves to recycle it. 986 */ 987 if ((active = vp->v_usecount) != 0) 988 vp->v_usecount++; 989 990 /* 991 * Prevent the vnode from being recycled or 992 * brought into use while we clean it out. 993 */ 994 if (vp->v_flag & VXLOCK) 995 panic("vclean: deadlock"); 996 vp->v_flag |= VXLOCK; 997 /* 998 * Even if the count is zero, the VOP_INACTIVE routine may still 999 * have the object locked while it cleans it out. The VOP_LOCK 1000 * ensures that the VOP_INACTIVE routine is done with its work. 1001 * For active vnodes, it ensures that no other activity can 1002 * occur while the underlying object is being cleaned out. 1003 */ 1004 VOP_LOCK(vp, LK_DRAIN | LK_EXCLUSIVE); 1005 1006 /* 1007 * Clean out any VM data associated with the vnode. 1008 */ 1009 uvm_vnp_terminate(vp); 1010 /* 1011 * Clean out any buffers associated with the vnode. 1012 */ 1013 if (flags & DOCLOSE) 1014 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 1015 /* 1016 * If purging an active vnode, it must be closed and 1017 * deactivated before being reclaimed. Note that the 1018 * VOP_INACTIVE will unlock the vnode 1019 */ 1020 if (active) { 1021 if (flags & DOCLOSE) 1022 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1023 VOP_INACTIVE(vp, p); 1024 } else { 1025 /* 1026 * Any other processes trying to obtain this lock must first 1027 * wait for VXLOCK to clear, then call the new lock operation. 1028 */ 1029 VOP_UNLOCK(vp); 1030 } 1031 1032 /* 1033 * Reclaim the vnode. 1034 */ 1035 if (VOP_RECLAIM(vp, p)) 1036 panic("vclean: cannot reclaim"); 1037 if (active) { 1038 vp->v_usecount--; 1039 if (vp->v_usecount == 0) { 1040 if (vp->v_holdcnt > 0) 1041 panic("vclean: not clean"); 1042 vputonfreelist(vp); 1043 } 1044 } 1045 cache_purge(vp); 1046 1047 /* 1048 * Done with purge, notify sleepers of the grim news. 1049 */ 1050 vp->v_op = &dead_vops; 1051 VN_KNOTE(vp, NOTE_REVOKE); 1052 vp->v_tag = VT_NON; 1053 vp->v_flag &= ~VXLOCK; 1054 #ifdef VFSLCKDEBUG 1055 vp->v_flag &= ~VLOCKSWORK; 1056 #endif 1057 if (vp->v_flag & VXWANT) { 1058 vp->v_flag &= ~VXWANT; 1059 wakeup(vp); 1060 } 1061 } 1062 1063 /* 1064 * Recycle an unused vnode to the front of the free list. 1065 */ 1066 int 1067 vrecycle(struct vnode *vp, struct proc *p) 1068 { 1069 if (vp->v_usecount == 0) { 1070 vgonel(vp, p); 1071 return (1); 1072 } 1073 return (0); 1074 } 1075 1076 /* 1077 * Eliminate all activity associated with a vnode 1078 * in preparation for reuse. 1079 */ 1080 void 1081 vgone(struct vnode *vp) 1082 { 1083 struct proc *p = curproc; 1084 vgonel(vp, p); 1085 } 1086 1087 /* 1088 * vgone, with struct proc. 1089 */ 1090 void 1091 vgonel(struct vnode *vp, struct proc *p) 1092 { 1093 struct vnode *vq; 1094 struct vnode *vx; 1095 1096 KASSERT(vp->v_uvcount == 0); 1097 1098 /* 1099 * If a vgone (or vclean) is already in progress, 1100 * wait until it is done and return. 1101 */ 1102 if (vp->v_flag & VXLOCK) { 1103 vp->v_flag |= VXWANT; 1104 tsleep(vp, PINOD, "vgone", 0); 1105 return; 1106 } 1107 1108 /* 1109 * Clean out the filesystem specific data. 1110 */ 1111 vclean(vp, DOCLOSE, p); 1112 /* 1113 * Delete from old mount point vnode list, if on one. 1114 */ 1115 if (vp->v_mount != NULL) 1116 insmntque(vp, NULL); 1117 /* 1118 * If special device, remove it from special device alias list 1119 * if it is on one. 1120 */ 1121 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1122 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1123 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1124 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1125 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1126 } 1127 if (*vp->v_hashchain == vp) { 1128 *vp->v_hashchain = vp->v_specnext; 1129 } else { 1130 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1131 if (vq->v_specnext != vp) 1132 continue; 1133 vq->v_specnext = vp->v_specnext; 1134 break; 1135 } 1136 if (vq == NULL) 1137 panic("missing bdev"); 1138 } 1139 if (vp->v_flag & VALIASED) { 1140 vx = NULL; 1141 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1142 if (vq->v_rdev != vp->v_rdev || 1143 vq->v_type != vp->v_type) 1144 continue; 1145 if (vx) 1146 break; 1147 vx = vq; 1148 } 1149 if (vx == NULL) 1150 panic("missing alias"); 1151 if (vq == NULL) 1152 vx->v_flag &= ~VALIASED; 1153 vp->v_flag &= ~VALIASED; 1154 } 1155 lf_purgelocks(&vp->v_speclockf); 1156 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1157 vp->v_specinfo = NULL; 1158 } 1159 /* 1160 * If it is on the freelist and not already at the head, 1161 * move it to the head of the list. 1162 */ 1163 vp->v_type = VBAD; 1164 1165 /* 1166 * Move onto the free list, unless we were called from 1167 * getnewvnode and we're not on any free list 1168 */ 1169 if (vp->v_usecount == 0 && 1170 (vp->v_bioflag & VBIOONFREELIST)) { 1171 int s; 1172 1173 s = splbio(); 1174 1175 if (vp->v_holdcnt > 0) 1176 panic("vgonel: not clean"); 1177 1178 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1179 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1180 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1181 } 1182 splx(s); 1183 } 1184 } 1185 1186 /* 1187 * Lookup a vnode by device number. 1188 */ 1189 int 1190 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1191 { 1192 struct vnode *vp; 1193 int rc =0; 1194 1195 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1196 if (dev != vp->v_rdev || type != vp->v_type) 1197 continue; 1198 *vpp = vp; 1199 rc = 1; 1200 break; 1201 } 1202 return (rc); 1203 } 1204 1205 /* 1206 * Revoke all the vnodes corresponding to the specified minor number 1207 * range (endpoints inclusive) of the specified major. 1208 */ 1209 void 1210 vdevgone(int maj, int minl, int minh, enum vtype type) 1211 { 1212 struct vnode *vp; 1213 int mn; 1214 1215 for (mn = minl; mn <= minh; mn++) 1216 if (vfinddev(makedev(maj, mn), type, &vp)) 1217 VOP_REVOKE(vp, REVOKEALL); 1218 } 1219 1220 /* 1221 * Calculate the total number of references to a special device. 1222 */ 1223 int 1224 vcount(struct vnode *vp) 1225 { 1226 struct vnode *vq, *vnext; 1227 int count; 1228 1229 loop: 1230 if ((vp->v_flag & VALIASED) == 0) 1231 return (vp->v_usecount); 1232 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1233 vnext = vq->v_specnext; 1234 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1235 continue; 1236 /* 1237 * Alias, but not in use, so flush it out. 1238 */ 1239 if (vq->v_usecount == 0 && vq != vp) { 1240 vgone(vq); 1241 goto loop; 1242 } 1243 count += vq->v_usecount; 1244 } 1245 return (count); 1246 } 1247 1248 #if defined(DEBUG) || defined(DIAGNOSTIC) 1249 /* 1250 * Print out a description of a vnode. 1251 */ 1252 static char *typename[] = 1253 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1254 1255 void 1256 vprint(char *label, struct vnode *vp) 1257 { 1258 char buf[64]; 1259 1260 if (label != NULL) 1261 printf("%s: ", label); 1262 printf("%p, type %s, use %u, write %u, hold %u,", 1263 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1264 vp->v_holdcnt); 1265 buf[0] = '\0'; 1266 if (vp->v_flag & VROOT) 1267 strlcat(buf, "|VROOT", sizeof buf); 1268 if (vp->v_flag & VTEXT) 1269 strlcat(buf, "|VTEXT", sizeof buf); 1270 if (vp->v_flag & VSYSTEM) 1271 strlcat(buf, "|VSYSTEM", sizeof buf); 1272 if (vp->v_flag & VXLOCK) 1273 strlcat(buf, "|VXLOCK", sizeof buf); 1274 if (vp->v_flag & VXWANT) 1275 strlcat(buf, "|VXWANT", sizeof buf); 1276 if (vp->v_bioflag & VBIOWAIT) 1277 strlcat(buf, "|VBIOWAIT", sizeof buf); 1278 if (vp->v_bioflag & VBIOONFREELIST) 1279 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1280 if (vp->v_bioflag & VBIOONSYNCLIST) 1281 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1282 if (vp->v_flag & VALIASED) 1283 strlcat(buf, "|VALIASED", sizeof buf); 1284 if (buf[0] != '\0') 1285 printf(" flags (%s)", &buf[1]); 1286 if (vp->v_data == NULL) { 1287 printf("\n"); 1288 } else { 1289 printf("\n\t"); 1290 VOP_PRINT(vp); 1291 } 1292 } 1293 #endif /* DEBUG || DIAGNOSTIC */ 1294 1295 #ifdef DEBUG 1296 /* 1297 * List all of the locked vnodes in the system. 1298 * Called when debugging the kernel. 1299 */ 1300 void 1301 printlockedvnodes(void) 1302 { 1303 struct mount *mp; 1304 struct vnode *vp; 1305 1306 printf("Locked vnodes\n"); 1307 1308 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1309 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1310 continue; 1311 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1312 if (VOP_ISLOCKED(vp)) 1313 vprint(NULL, vp); 1314 } 1315 vfs_unbusy(mp); 1316 } 1317 1318 } 1319 #endif 1320 1321 /* 1322 * Top level filesystem related information gathering. 1323 */ 1324 int 1325 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1326 size_t newlen, struct proc *p) 1327 { 1328 struct vfsconf *vfsp, *tmpvfsp; 1329 int ret; 1330 1331 /* all sysctl names at this level are at least name and field */ 1332 if (namelen < 2) 1333 return (ENOTDIR); /* overloaded */ 1334 1335 if (name[0] != VFS_GENERIC) { 1336 vfsp = vfs_bytypenum(name[0]); 1337 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1338 return (EOPNOTSUPP); 1339 1340 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1341 oldp, oldlenp, newp, newlen, p)); 1342 } 1343 1344 switch (name[1]) { 1345 case VFS_MAXTYPENUM: 1346 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1347 1348 case VFS_CONF: 1349 if (namelen < 3) 1350 return (ENOTDIR); /* overloaded */ 1351 1352 vfsp = vfs_bytypenum(name[2]); 1353 if (vfsp == NULL) 1354 return (EOPNOTSUPP); 1355 1356 /* Make a copy, clear out kernel pointers */ 1357 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1358 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1359 tmpvfsp->vfc_vfsops = NULL; 1360 1361 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1362 sizeof(struct vfsconf)); 1363 1364 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1365 return (ret); 1366 case VFS_BCACHESTAT: /* buffer cache statistics */ 1367 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1368 sizeof(struct bcachestats)); 1369 return(ret); 1370 } 1371 return (EOPNOTSUPP); 1372 } 1373 1374 /* 1375 * Check to see if a filesystem is mounted on a block device. 1376 */ 1377 int 1378 vfs_mountedon(struct vnode *vp) 1379 { 1380 struct vnode *vq; 1381 int error = 0; 1382 1383 if (vp->v_specmountpoint != NULL) 1384 return (EBUSY); 1385 if (vp->v_flag & VALIASED) { 1386 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1387 if (vq->v_rdev != vp->v_rdev || 1388 vq->v_type != vp->v_type) 1389 continue; 1390 if (vq->v_specmountpoint != NULL) { 1391 error = EBUSY; 1392 break; 1393 } 1394 } 1395 } 1396 return (error); 1397 } 1398 1399 #ifdef NFSSERVER 1400 /* 1401 * Build hash lists of net addresses and hang them off the mount point. 1402 * Called by vfs_export() to set up the lists of export addresses. 1403 */ 1404 int 1405 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1406 struct export_args *argp) 1407 { 1408 struct netcred *np; 1409 struct radix_node_head *rnh; 1410 int nplen, i; 1411 struct radix_node *rn; 1412 struct sockaddr *saddr, *smask = 0; 1413 int error; 1414 1415 if (argp->ex_addrlen == 0) { 1416 if (mp->mnt_flag & MNT_DEFEXPORTED) 1417 return (EPERM); 1418 np = &nep->ne_defexported; 1419 /* fill in the kernel's ucred from userspace's xucred */ 1420 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1421 return (error); 1422 mp->mnt_flag |= MNT_DEFEXPORTED; 1423 goto finish; 1424 } 1425 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1426 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1427 return (EINVAL); 1428 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1429 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1430 np->netc_len = nplen; 1431 saddr = (struct sockaddr *)(np + 1); 1432 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1433 if (error) 1434 goto out; 1435 if (saddr->sa_len > argp->ex_addrlen) 1436 saddr->sa_len = argp->ex_addrlen; 1437 if (argp->ex_masklen) { 1438 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1439 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1440 if (error) 1441 goto out; 1442 if (smask->sa_len > argp->ex_masklen) 1443 smask->sa_len = argp->ex_masklen; 1444 } 1445 /* fill in the kernel's ucred from userspace's xucred */ 1446 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1447 goto out; 1448 i = saddr->sa_family; 1449 switch (i) { 1450 case AF_INET: 1451 if ((rnh = nep->ne_rtable_inet) == NULL) { 1452 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1453 offsetof(struct sockaddr_in, sin_addr))) { 1454 error = ENOBUFS; 1455 goto out; 1456 } 1457 rnh = nep->ne_rtable_inet; 1458 } 1459 break; 1460 default: 1461 error = EINVAL; 1462 goto out; 1463 } 1464 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1465 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 1466 error = EPERM; 1467 goto out; 1468 } 1469 finish: 1470 np->netc_exflags = argp->ex_flags; 1471 return (0); 1472 out: 1473 free(np, M_NETADDR, np->netc_len); 1474 return (error); 1475 } 1476 1477 int 1478 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1479 { 1480 struct radix_node_head *rnh = (struct radix_node_head *)w; 1481 struct netcred * np = (struct netcred *)rn; 1482 1483 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1484 free(np, M_NETADDR, np->netc_len); 1485 return (0); 1486 } 1487 1488 /* 1489 * Free the net address hash lists that are hanging off the mount points. 1490 */ 1491 void 1492 vfs_free_addrlist(struct netexport *nep) 1493 { 1494 struct radix_node_head *rnh; 1495 1496 if ((rnh = nep->ne_rtable_inet) != NULL) { 1497 rn_walktree(rnh, vfs_free_netcred, rnh); 1498 free(rnh, M_RTABLE, sizeof(*rnh)); 1499 nep->ne_rtable_inet = NULL; 1500 } 1501 } 1502 #endif /* NFSSERVER */ 1503 1504 int 1505 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1506 { 1507 #ifdef NFSSERVER 1508 int error; 1509 1510 if (argp->ex_flags & MNT_DELEXPORT) { 1511 vfs_free_addrlist(nep); 1512 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1513 } 1514 if (argp->ex_flags & MNT_EXPORTED) { 1515 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1516 return (error); 1517 mp->mnt_flag |= MNT_EXPORTED; 1518 } 1519 return (0); 1520 #else 1521 return (ENOTSUP); 1522 #endif /* NFSSERVER */ 1523 } 1524 1525 struct netcred * 1526 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1527 { 1528 #ifdef NFSSERVER 1529 struct netcred *np; 1530 struct radix_node_head *rnh; 1531 struct sockaddr *saddr; 1532 1533 np = NULL; 1534 if (mp->mnt_flag & MNT_EXPORTED) { 1535 /* 1536 * Lookup in the export list first. 1537 */ 1538 if (nam != NULL) { 1539 saddr = mtod(nam, struct sockaddr *); 1540 switch(saddr->sa_family) { 1541 case AF_INET: 1542 rnh = nep->ne_rtable_inet; 1543 break; 1544 default: 1545 rnh = NULL; 1546 break; 1547 } 1548 if (rnh != NULL) 1549 np = (struct netcred *)rn_match(saddr, rnh); 1550 } 1551 /* 1552 * If no address match, use the default if it exists. 1553 */ 1554 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1555 np = &nep->ne_defexported; 1556 } 1557 return (np); 1558 #else 1559 return (NULL); 1560 #endif /* NFSSERVER */ 1561 } 1562 1563 /* 1564 * Do the usual access checking. 1565 * file_mode, uid and gid are from the vnode in question, 1566 * while acc_mode and cred are from the VOP_ACCESS parameter list 1567 */ 1568 int 1569 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1570 mode_t acc_mode, struct ucred *cred) 1571 { 1572 mode_t mask; 1573 1574 /* User id 0 always gets read/write access. */ 1575 if (cred->cr_uid == 0) { 1576 /* For VEXEC, at least one of the execute bits must be set. */ 1577 if ((acc_mode & VEXEC) && type != VDIR && 1578 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1579 return EACCES; 1580 return 0; 1581 } 1582 1583 mask = 0; 1584 1585 /* Otherwise, check the owner. */ 1586 if (cred->cr_uid == uid) { 1587 if (acc_mode & VEXEC) 1588 mask |= S_IXUSR; 1589 if (acc_mode & VREAD) 1590 mask |= S_IRUSR; 1591 if (acc_mode & VWRITE) 1592 mask |= S_IWUSR; 1593 return (file_mode & mask) == mask ? 0 : EACCES; 1594 } 1595 1596 /* Otherwise, check the groups. */ 1597 if (groupmember(gid, cred)) { 1598 if (acc_mode & VEXEC) 1599 mask |= S_IXGRP; 1600 if (acc_mode & VREAD) 1601 mask |= S_IRGRP; 1602 if (acc_mode & VWRITE) 1603 mask |= S_IWGRP; 1604 return (file_mode & mask) == mask ? 0 : EACCES; 1605 } 1606 1607 /* Otherwise, check everyone else. */ 1608 if (acc_mode & VEXEC) 1609 mask |= S_IXOTH; 1610 if (acc_mode & VREAD) 1611 mask |= S_IROTH; 1612 if (acc_mode & VWRITE) 1613 mask |= S_IWOTH; 1614 return (file_mode & mask) == mask ? 0 : EACCES; 1615 } 1616 1617 int 1618 vnoperm(struct vnode *vp) 1619 { 1620 if (vp->v_flag & VROOT || vp->v_mount == NULL) 1621 return 0; 1622 1623 return (vp->v_mount->mnt_flag & MNT_NOPERM); 1624 } 1625 1626 struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1627 1628 int 1629 vfs_stall(struct proc *p, int stall) 1630 { 1631 struct mount *mp; 1632 int allerror = 0, error; 1633 1634 if (stall) 1635 rw_enter_write(&vfs_stall_lock); 1636 1637 /* 1638 * The loop variable mp is protected by vfs_busy() so that it cannot 1639 * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the 1640 * lock order consistent with dounmount(). 1641 */ 1642 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1643 if (stall) { 1644 error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); 1645 if (error) { 1646 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1647 allerror = error; 1648 continue; 1649 } 1650 uvm_vnp_sync(mp); 1651 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1652 if (error) { 1653 printf("%s: failed to sync\n", mp->mnt_stat.f_mntonname); 1654 vfs_unbusy(mp); 1655 allerror = error; 1656 continue; 1657 } 1658 mp->mnt_flag |= MNT_STALLED; 1659 } else { 1660 if (mp->mnt_flag & MNT_STALLED) { 1661 vfs_unbusy(mp); 1662 mp->mnt_flag &= ~MNT_STALLED; 1663 } 1664 } 1665 } 1666 1667 if (!stall) 1668 rw_exit_write(&vfs_stall_lock); 1669 1670 return (allerror); 1671 } 1672 1673 void 1674 vfs_stall_barrier(void) 1675 { 1676 rw_enter_read(&vfs_stall_lock); 1677 rw_exit_read(&vfs_stall_lock); 1678 } 1679 1680 /* 1681 * Unmount all file systems. 1682 * We traverse the list in reverse order under the assumption that doing so 1683 * will avoid needing to worry about dependencies. 1684 */ 1685 void 1686 vfs_unmountall(void) 1687 { 1688 struct mount *mp, *nmp; 1689 int allerror, error, again = 1; 1690 1691 retry: 1692 allerror = 0; 1693 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1694 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1695 continue; 1696 /* XXX Here is a race, the next pointer is not locked. */ 1697 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1698 printf("unmount of %s failed with error %d\n", 1699 mp->mnt_stat.f_mntonname, error); 1700 allerror = 1; 1701 } 1702 } 1703 1704 if (allerror) { 1705 printf("WARNING: some file systems would not unmount\n"); 1706 if (again) { 1707 printf("retrying\n"); 1708 again = 0; 1709 goto retry; 1710 } 1711 } 1712 } 1713 1714 /* 1715 * Sync and unmount file systems before shutting down. 1716 */ 1717 void 1718 vfs_shutdown(struct proc *p) 1719 { 1720 #ifdef ACCOUNTING 1721 acct_shutdown(); 1722 #endif 1723 1724 printf("syncing disks..."); 1725 1726 if (panicstr == 0) { 1727 /* Sync before unmount, in case we hang on something. */ 1728 sys_sync(p, NULL, NULL); 1729 vfs_unmountall(); 1730 } 1731 1732 #if NSOFTRAID > 0 1733 sr_quiesce(); 1734 #endif 1735 1736 if (vfs_syncwait(p, 1)) 1737 printf(" giving up\n"); 1738 else 1739 printf(" done\n"); 1740 } 1741 1742 /* 1743 * perform sync() operation and wait for buffers to flush. 1744 */ 1745 int 1746 vfs_syncwait(struct proc *p, int verbose) 1747 { 1748 struct buf *bp; 1749 int iter, nbusy, dcount, s; 1750 #ifdef MULTIPROCESSOR 1751 int hold_count; 1752 #endif 1753 1754 sys_sync(p, NULL, NULL); 1755 1756 /* Wait for sync to finish. */ 1757 dcount = 10000; 1758 for (iter = 0; iter < 20; iter++) { 1759 nbusy = 0; 1760 LIST_FOREACH(bp, &bufhead, b_list) { 1761 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1762 nbusy++; 1763 /* 1764 * With soft updates, some buffers that are 1765 * written will be remarked as dirty until other 1766 * buffers are written. 1767 */ 1768 if (bp->b_flags & B_DELWRI) { 1769 s = splbio(); 1770 bremfree(bp); 1771 buf_acquire(bp); 1772 splx(s); 1773 nbusy++; 1774 bawrite(bp); 1775 if (dcount-- <= 0) { 1776 if (verbose) 1777 printf("softdep "); 1778 return 1; 1779 } 1780 } 1781 } 1782 if (nbusy == 0) 1783 break; 1784 if (verbose) 1785 printf("%d ", nbusy); 1786 #ifdef MULTIPROCESSOR 1787 if (_kernel_lock_held()) 1788 hold_count = __mp_release_all(&kernel_lock); 1789 else 1790 hold_count = 0; 1791 #endif 1792 DELAY(40000 * iter); 1793 #ifdef MULTIPROCESSOR 1794 if (hold_count) 1795 __mp_acquire_count(&kernel_lock, hold_count); 1796 #endif 1797 } 1798 1799 return nbusy; 1800 } 1801 1802 /* 1803 * posix file system related system variables. 1804 */ 1805 int 1806 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1807 void *newp, size_t newlen, struct proc *p) 1808 { 1809 /* all sysctl names at this level are terminal */ 1810 if (namelen != 1) 1811 return (ENOTDIR); 1812 1813 switch (name[0]) { 1814 case FS_POSIX_SETUID: 1815 if (newp && securelevel > 0) 1816 return (EPERM); 1817 return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear)); 1818 default: 1819 return (EOPNOTSUPP); 1820 } 1821 /* NOTREACHED */ 1822 } 1823 1824 /* 1825 * file system related system variables. 1826 */ 1827 int 1828 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1829 size_t newlen, struct proc *p) 1830 { 1831 sysctlfn *fn; 1832 1833 switch (name[0]) { 1834 case FS_POSIX: 1835 fn = fs_posix_sysctl; 1836 break; 1837 default: 1838 return (EOPNOTSUPP); 1839 } 1840 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1841 } 1842 1843 1844 /* 1845 * Routines dealing with vnodes and buffers 1846 */ 1847 1848 /* 1849 * Wait for all outstanding I/Os to complete 1850 * 1851 * Manipulates v_numoutput. Must be called at splbio() 1852 */ 1853 int 1854 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo) 1855 { 1856 int error = 0; 1857 1858 splassert(IPL_BIO); 1859 1860 while (vp->v_numoutput) { 1861 vp->v_bioflag |= VBIOWAIT; 1862 error = tsleep(&vp->v_numoutput, 1863 slpflag | (PRIBIO + 1), wmesg, timeo); 1864 if (error) 1865 break; 1866 } 1867 1868 return (error); 1869 } 1870 1871 /* 1872 * Update outstanding I/O count and do wakeup if requested. 1873 * 1874 * Manipulates v_numoutput. Must be called at splbio() 1875 */ 1876 void 1877 vwakeup(struct vnode *vp) 1878 { 1879 splassert(IPL_BIO); 1880 1881 if (vp != NULL) { 1882 if (vp->v_numoutput-- == 0) 1883 panic("vwakeup: neg numoutput"); 1884 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1885 vp->v_bioflag &= ~VBIOWAIT; 1886 wakeup(&vp->v_numoutput); 1887 } 1888 } 1889 } 1890 1891 /* 1892 * Flush out and invalidate all buffers associated with a vnode. 1893 * Called with the underlying object locked. 1894 */ 1895 int 1896 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1897 int slpflag, int slptimeo) 1898 { 1899 struct buf *bp; 1900 struct buf *nbp, *blist; 1901 int s, error; 1902 1903 #ifdef VFSLCKDEBUG 1904 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1905 panic("%s: vp isn't locked, vp %p", __func__, vp); 1906 #endif 1907 1908 if (flags & V_SAVE) { 1909 s = splbio(); 1910 vwaitforio(vp, 0, "vinvalbuf", 0); 1911 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1912 splx(s); 1913 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1914 return (error); 1915 s = splbio(); 1916 if (vp->v_numoutput > 0 || 1917 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1918 panic("%s: dirty bufs, vp %p", __func__, vp); 1919 } 1920 splx(s); 1921 } 1922 loop: 1923 s = splbio(); 1924 for (;;) { 1925 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1926 (flags & V_SAVEMETA)) 1927 while (blist && blist->b_lblkno < 0) 1928 blist = LIST_NEXT(blist, b_vnbufs); 1929 if (blist == NULL && 1930 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1931 (flags & V_SAVEMETA)) 1932 while (blist && blist->b_lblkno < 0) 1933 blist = LIST_NEXT(blist, b_vnbufs); 1934 if (!blist) 1935 break; 1936 1937 for (bp = blist; bp; bp = nbp) { 1938 nbp = LIST_NEXT(bp, b_vnbufs); 1939 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1940 continue; 1941 if (bp->b_flags & B_BUSY) { 1942 bp->b_flags |= B_WANTED; 1943 error = tsleep(bp, slpflag | (PRIBIO + 1), 1944 "vinvalbuf", slptimeo); 1945 if (error) { 1946 splx(s); 1947 return (error); 1948 } 1949 break; 1950 } 1951 bremfree(bp); 1952 /* 1953 * XXX Since there are no node locks for NFS, I believe 1954 * there is a slight chance that a delayed write will 1955 * occur while sleeping just above, so check for it. 1956 */ 1957 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 1958 buf_acquire(bp); 1959 splx(s); 1960 (void) VOP_BWRITE(bp); 1961 goto loop; 1962 } 1963 buf_acquire_nomap(bp); 1964 bp->b_flags |= B_INVAL; 1965 brelse(bp); 1966 } 1967 } 1968 if (!(flags & V_SAVEMETA) && 1969 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 1970 panic("%s: flush failed, vp %p", __func__, vp); 1971 splx(s); 1972 return (0); 1973 } 1974 1975 void 1976 vflushbuf(struct vnode *vp, int sync) 1977 { 1978 struct buf *bp, *nbp; 1979 int s; 1980 1981 loop: 1982 s = splbio(); 1983 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 1984 if ((bp->b_flags & B_BUSY)) 1985 continue; 1986 if ((bp->b_flags & B_DELWRI) == 0) 1987 panic("vflushbuf: not dirty"); 1988 bremfree(bp); 1989 buf_acquire(bp); 1990 splx(s); 1991 /* 1992 * Wait for I/O associated with indirect blocks to complete, 1993 * since there is no way to quickly wait for them below. 1994 */ 1995 if (bp->b_vp == vp || sync == 0) 1996 (void) bawrite(bp); 1997 else 1998 (void) bwrite(bp); 1999 goto loop; 2000 } 2001 if (sync == 0) { 2002 splx(s); 2003 return; 2004 } 2005 vwaitforio(vp, 0, "vflushbuf", 0); 2006 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 2007 splx(s); 2008 #ifdef DIAGNOSTIC 2009 vprint("vflushbuf: dirty", vp); 2010 #endif 2011 goto loop; 2012 } 2013 splx(s); 2014 } 2015 2016 /* 2017 * Associate a buffer with a vnode. 2018 * 2019 * Manipulates buffer vnode queues. Must be called at splbio(). 2020 */ 2021 void 2022 bgetvp(struct vnode *vp, struct buf *bp) 2023 { 2024 splassert(IPL_BIO); 2025 2026 2027 if (bp->b_vp) 2028 panic("bgetvp: not free"); 2029 vhold(vp); 2030 bp->b_vp = vp; 2031 if (vp->v_type == VBLK || vp->v_type == VCHR) 2032 bp->b_dev = vp->v_rdev; 2033 else 2034 bp->b_dev = NODEV; 2035 /* 2036 * Insert onto list for new vnode. 2037 */ 2038 bufinsvn(bp, &vp->v_cleanblkhd); 2039 } 2040 2041 /* 2042 * Disassociate a buffer from a vnode. 2043 * 2044 * Manipulates vnode buffer queues. Must be called at splbio(). 2045 */ 2046 void 2047 brelvp(struct buf *bp) 2048 { 2049 struct vnode *vp; 2050 2051 splassert(IPL_BIO); 2052 2053 if ((vp = bp->b_vp) == (struct vnode *) 0) 2054 panic("brelvp: NULL"); 2055 /* 2056 * Delete from old vnode list, if on one. 2057 */ 2058 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2059 bufremvn(bp); 2060 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2061 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2062 vp->v_bioflag &= ~VBIOONSYNCLIST; 2063 LIST_REMOVE(vp, v_synclist); 2064 } 2065 bp->b_vp = NULL; 2066 2067 vdrop(vp); 2068 } 2069 2070 /* 2071 * Replaces the current vnode associated with the buffer, if any, 2072 * with a new vnode. 2073 * 2074 * If an output I/O is pending on the buffer, the old vnode 2075 * I/O count is adjusted. 2076 * 2077 * Ignores vnode buffer queues. Must be called at splbio(). 2078 */ 2079 void 2080 buf_replacevnode(struct buf *bp, struct vnode *newvp) 2081 { 2082 struct vnode *oldvp = bp->b_vp; 2083 2084 splassert(IPL_BIO); 2085 2086 if (oldvp) 2087 brelvp(bp); 2088 2089 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2090 newvp->v_numoutput++; /* put it on swapdev */ 2091 vwakeup(oldvp); 2092 } 2093 2094 bgetvp(newvp, bp); 2095 bufremvn(bp); 2096 } 2097 2098 /* 2099 * Used to assign buffers to the appropriate clean or dirty list on 2100 * the vnode and to add newly dirty vnodes to the appropriate 2101 * filesystem syncer list. 2102 * 2103 * Manipulates vnode buffer queues. Must be called at splbio(). 2104 */ 2105 void 2106 reassignbuf(struct buf *bp) 2107 { 2108 struct buflists *listheadp; 2109 int delay; 2110 struct vnode *vp = bp->b_vp; 2111 2112 splassert(IPL_BIO); 2113 2114 /* 2115 * Delete from old vnode list, if on one. 2116 */ 2117 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2118 bufremvn(bp); 2119 2120 /* 2121 * If dirty, put on list of dirty buffers; 2122 * otherwise insert onto list of clean buffers. 2123 */ 2124 if ((bp->b_flags & B_DELWRI) == 0) { 2125 listheadp = &vp->v_cleanblkhd; 2126 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2127 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2128 vp->v_bioflag &= ~VBIOONSYNCLIST; 2129 LIST_REMOVE(vp, v_synclist); 2130 } 2131 } else { 2132 listheadp = &vp->v_dirtyblkhd; 2133 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2134 switch (vp->v_type) { 2135 case VDIR: 2136 delay = syncdelay / 2; 2137 break; 2138 case VBLK: 2139 if (vp->v_specmountpoint != NULL) { 2140 delay = syncdelay / 3; 2141 break; 2142 } 2143 /* FALLTHROUGH */ 2144 default: 2145 delay = syncdelay; 2146 } 2147 vn_syncer_add_to_worklist(vp, delay); 2148 } 2149 } 2150 bufinsvn(bp, listheadp); 2151 } 2152 2153 /* 2154 * Check if vnode represents a disk device 2155 */ 2156 int 2157 vn_isdisk(struct vnode *vp, int *errp) 2158 { 2159 if (vp->v_type != VBLK && vp->v_type != VCHR) 2160 return (0); 2161 2162 return (1); 2163 } 2164 2165 #ifdef DDB 2166 #include <machine/db_machdep.h> 2167 #include <ddb/db_interface.h> 2168 2169 void 2170 vfs_buf_print(void *b, int full, 2171 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2172 { 2173 struct buf *bp = b; 2174 2175 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2176 " proc %p error %d flags %lb\n", 2177 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2178 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2179 2180 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2181 " data %p saveaddr %p dep %p iodone %p\n", 2182 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2183 bp->b_data, bp->b_saveaddr, 2184 LIST_FIRST(&bp->b_dep), bp->b_iodone); 2185 2186 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2187 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2188 2189 #ifdef FFS_SOFTUPDATES 2190 if (full) 2191 softdep_print(bp, full, pr); 2192 #endif 2193 } 2194 2195 const char *vtypes[] = { VTYPE_NAMES }; 2196 const char *vtags[] = { VTAG_NAMES }; 2197 2198 void 2199 vfs_vnode_print(void *v, int full, 2200 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2201 { 2202 struct vnode *vp = v; 2203 2204 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2205 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2206 vp->v_tag, 2207 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2208 vp->v_type, vp->v_mount, vp->v_mountedhere); 2209 2210 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2211 vp->v_data, vp->v_usecount, vp->v_writecount, 2212 vp->v_holdcnt, vp->v_numoutput); 2213 2214 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2215 2216 if (full) { 2217 struct buf *bp; 2218 2219 (*pr)("clean bufs:\n"); 2220 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2221 (*pr)(" bp %p\n", bp); 2222 vfs_buf_print(bp, full, pr); 2223 } 2224 2225 (*pr)("dirty bufs:\n"); 2226 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2227 (*pr)(" bp %p\n", bp); 2228 vfs_buf_print(bp, full, pr); 2229 } 2230 } 2231 } 2232 2233 void 2234 vfs_mount_print(struct mount *mp, int full, 2235 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2236 { 2237 struct vfsconf *vfc = mp->mnt_vfc; 2238 struct vnode *vp; 2239 int cnt; 2240 2241 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2242 mp->mnt_flag, MNT_BITS, 2243 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2244 2245 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", 2246 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2247 vfc->vfc_refcount, vfc->vfc_flags); 2248 2249 (*pr)("statvfs cache: bsize %x iosize %x\nblocks %llu free %llu avail %lld\n", 2250 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2251 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2252 2253 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2254 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2255 2256 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2257 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2258 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2259 2260 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2261 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2262 2263 (*pr)(" syncreads %llu asyncreads = %llu\n", 2264 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2265 2266 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2267 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2268 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2269 2270 (*pr)("locked vnodes:"); 2271 /* XXX would take mountlist lock, except ddb has no context */ 2272 cnt = 0; 2273 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2274 if (VOP_ISLOCKED(vp)) { 2275 if (cnt == 0) 2276 (*pr)("\n %p", vp); 2277 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2278 (*pr)(",\n %p", vp); 2279 else 2280 (*pr)(", %p", vp); 2281 cnt++; 2282 } 2283 } 2284 (*pr)("\n"); 2285 2286 if (full) { 2287 (*pr)("all vnodes:"); 2288 /* XXX would take mountlist lock, except ddb has no context */ 2289 cnt = 0; 2290 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2291 if (cnt == 0) 2292 (*pr)("\n %p", vp); 2293 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2294 (*pr)(",\n %p", vp); 2295 else 2296 (*pr)(", %p", vp); 2297 cnt++; 2298 } 2299 (*pr)("\n"); 2300 } 2301 } 2302 #endif /* DDB */ 2303 2304 void 2305 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2306 { 2307 const struct statfs *mbp; 2308 2309 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2310 2311 if (sbp == (mbp = &mp->mnt_stat)) 2312 return; 2313 2314 sbp->f_fsid = mbp->f_fsid; 2315 sbp->f_owner = mbp->f_owner; 2316 sbp->f_flags = mbp->f_flags; 2317 sbp->f_syncwrites = mbp->f_syncwrites; 2318 sbp->f_asyncwrites = mbp->f_asyncwrites; 2319 sbp->f_syncreads = mbp->f_syncreads; 2320 sbp->f_asyncreads = mbp->f_asyncreads; 2321 sbp->f_namemax = mbp->f_namemax; 2322 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2323 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2324 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2325 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2326 sizeof(union mount_info)); 2327 } 2328