vfs_subr.c revision 1.272
1/* $OpenBSD: vfs_subr.c,v 1.272 2018/05/08 10:53:35 bluhm 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/stat.h> 56#include <sys/acct.h> 57#include <sys/namei.h> 58#include <sys/ucred.h> 59#include <sys/buf.h> 60#include <sys/errno.h> 61#include <sys/malloc.h> 62#include <sys/mbuf.h> 63#include <sys/syscallargs.h> 64#include <sys/pool.h> 65#include <sys/tree.h> 66#include <sys/specdev.h> 67 68#include <netinet/in.h> 69 70#include <uvm/uvm_extern.h> 71#include <uvm/uvm_vnode.h> 72 73#include "softraid.h" 74 75void sr_quiesce(void); 76 77enum vtype iftovt_tab[16] = { 78 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 79 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 80}; 81 82int vttoif_tab[9] = { 83 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 84 S_IFSOCK, S_IFIFO, S_IFMT, 85}; 86 87int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 88int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */ 89 90/* 91 * Insq/Remq for the vnode usage lists. 92 */ 93#define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) 94#define bufremvn(bp) { \ 95 LIST_REMOVE(bp, b_vnbufs); \ 96 LIST_NEXT(bp, b_vnbufs) = NOLIST; \ 97} 98 99struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 100struct freelst vnode_free_list; /* vnode free list */ 101 102struct mntlist mountlist; /* mounted filesystem list */ 103 104void vclean(struct vnode *, int, struct proc *); 105 106void insmntque(struct vnode *, struct mount *); 107int getdevvp(dev_t, struct vnode **, enum vtype); 108 109int vfs_hang_addrlist(struct mount *, struct netexport *, 110 struct export_args *); 111int vfs_free_netcred(struct radix_node *, void *, u_int); 112void vfs_free_addrlist(struct netexport *); 113void vputonfreelist(struct vnode *); 114 115int vflush_vnode(struct vnode *, void *); 116int maxvnodes; 117 118void vfs_unmountall(void); 119 120#ifdef DEBUG 121void printlockedvnodes(void); 122#endif 123 124struct pool vnode_pool; 125struct pool uvm_vnode_pool; 126 127static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 128RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 129 130static inline int 131rb_buf_compare(const struct buf *b1, const struct buf *b2) 132{ 133 if (b1->b_lblkno < b2->b_lblkno) 134 return(-1); 135 if (b1->b_lblkno > b2->b_lblkno) 136 return(1); 137 return(0); 138} 139 140/* 141 * Initialize the vnode management data structures. 142 */ 143void 144vntblinit(void) 145{ 146 /* buffer cache may need a vnode for each buffer */ 147 maxvnodes = 2 * initialvnodes; 148 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 149 PR_WAITOK, "vnodes", NULL); 150 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 151 PR_WAITOK, "uvmvnodes", NULL); 152 TAILQ_INIT(&vnode_hold_list); 153 TAILQ_INIT(&vnode_free_list); 154 TAILQ_INIT(&mountlist); 155 /* 156 * Initialize the filesystem syncer. 157 */ 158 vn_initialize_syncerd(); 159 160#ifdef NFSSERVER 161 rn_init(sizeof(struct sockaddr_in)); 162#endif /* NFSSERVER */ 163} 164 165/* 166 * Mark a mount point as busy. Used to synchronize access and to delay 167 * unmounting. 168 * 169 * Default behaviour is to attempt getting a READ lock and in case of an 170 * ongoing unmount, to wait for it to finish and then return failure. 171 */ 172int 173vfs_busy(struct mount *mp, int flags) 174{ 175 int rwflags = 0; 176 177 /* new mountpoints need their lock initialised */ 178 if (mp->mnt_lock.rwl_name == NULL) 179 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 180 181 if (flags & VB_WRITE) 182 rwflags |= RW_WRITE; 183 else 184 rwflags |= RW_READ; 185 186 if (flags & VB_WAIT) 187 rwflags |= RW_SLEEPFAIL; 188 else 189 rwflags |= RW_NOSLEEP; 190 191 if (rw_enter(&mp->mnt_lock, rwflags)) 192 return (EBUSY); 193 194 return (0); 195} 196 197/* 198 * Free a busy file system 199 */ 200void 201vfs_unbusy(struct mount *mp) 202{ 203 rw_exit(&mp->mnt_lock); 204} 205 206int 207vfs_isbusy(struct mount *mp) 208{ 209 if (RWLOCK_OWNER(&mp->mnt_lock) > 0) 210 return (1); 211 else 212 return (0); 213} 214 215/* 216 * Lookup a filesystem type, and if found allocate and initialize 217 * a mount structure for it. 218 * 219 * Devname is usually updated by mount(8) after booting. 220 */ 221int 222vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 223{ 224 struct vfsconf *vfsp; 225 struct mount *mp; 226 227 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 228 if (!strcmp(vfsp->vfc_name, fstypename)) 229 break; 230 if (vfsp == NULL) 231 return (ENODEV); 232 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 233 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 234 LIST_INIT(&mp->mnt_vnodelist); 235 mp->mnt_vfc = vfsp; 236 mp->mnt_op = vfsp->vfc_vfsops; 237 mp->mnt_flag = MNT_RDONLY; 238 mp->mnt_vnodecovered = NULLVP; 239 vfsp->vfc_refcount++; 240 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 241 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 242 mp->mnt_stat.f_mntonname[0] = '/'; 243 copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN, 0); 244 copystr(devname, mp->mnt_stat.f_mntfromspec, MNAMELEN, 0); 245 *mpp = mp; 246 return (0); 247 } 248 249/* 250 * Lookup a mount point by filesystem identifier. 251 */ 252struct mount * 253vfs_getvfs(fsid_t *fsid) 254{ 255 struct mount *mp; 256 257 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 258 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 259 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 260 return (mp); 261 } 262 } 263 264 return (NULL); 265} 266 267 268/* 269 * Get a new unique fsid 270 */ 271void 272vfs_getnewfsid(struct mount *mp) 273{ 274 static u_short xxxfs_mntid; 275 276 fsid_t tfsid; 277 int mtype; 278 279 mtype = mp->mnt_vfc->vfc_typenum; 280 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 281 mp->mnt_stat.f_fsid.val[1] = mtype; 282 if (xxxfs_mntid == 0) 283 ++xxxfs_mntid; 284 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 285 tfsid.val[1] = mtype; 286 if (!TAILQ_EMPTY(&mountlist)) { 287 while (vfs_getvfs(&tfsid)) { 288 tfsid.val[0]++; 289 xxxfs_mntid++; 290 } 291 } 292 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 293} 294 295/* 296 * Set vnode attributes to VNOVAL 297 */ 298void 299vattr_null(struct vattr *vap) 300{ 301 302 vap->va_type = VNON; 303 /* 304 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 305 * with 2^31-1 instead of 2^64-1. Just write'm out and let 306 * the compiler do its job. 307 */ 308 vap->va_mode = VNOVAL; 309 vap->va_nlink = VNOVAL; 310 vap->va_uid = VNOVAL; 311 vap->va_gid = VNOVAL; 312 vap->va_fsid = VNOVAL; 313 vap->va_fileid = VNOVAL; 314 vap->va_size = VNOVAL; 315 vap->va_blocksize = VNOVAL; 316 vap->va_atime.tv_sec = VNOVAL; 317 vap->va_atime.tv_nsec = VNOVAL; 318 vap->va_mtime.tv_sec = VNOVAL; 319 vap->va_mtime.tv_nsec = VNOVAL; 320 vap->va_ctime.tv_sec = VNOVAL; 321 vap->va_ctime.tv_nsec = VNOVAL; 322 vap->va_gen = VNOVAL; 323 vap->va_flags = VNOVAL; 324 vap->va_rdev = VNOVAL; 325 vap->va_bytes = VNOVAL; 326 vap->va_filerev = VNOVAL; 327 vap->va_vaflags = 0; 328} 329 330/* 331 * Routines having to do with the management of the vnode table. 332 */ 333long numvnodes; 334 335/* 336 * Return the next vnode from the free list. 337 */ 338int 339getnewvnode(enum vtagtype tag, struct mount *mp, struct vops *vops, 340 struct vnode **vpp) 341{ 342 struct proc *p = curproc; 343 struct freelst *listhd; 344 static int toggle; 345 struct vnode *vp; 346 int s; 347 348 /* 349 * allow maxvnodes to increase if the buffer cache itself 350 * is big enough to justify it. (we don't shrink it ever) 351 */ 352 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 353 : maxvnodes; 354 355 /* 356 * We must choose whether to allocate a new vnode or recycle an 357 * existing one. The criterion for allocating a new one is that 358 * the total number of vnodes is less than the number desired or 359 * there are no vnodes on either free list. Generally we only 360 * want to recycle vnodes that have no buffers associated with 361 * them, so we look first on the vnode_free_list. If it is empty, 362 * we next consider vnodes with referencing buffers on the 363 * vnode_hold_list. The toggle ensures that half the time we 364 * will use a buffer from the vnode_hold_list, and half the time 365 * we will allocate a new one unless the list has grown to twice 366 * the desired size. We are reticent to recycle vnodes from the 367 * vnode_hold_list because we will lose the identity of all its 368 * referencing buffers. 369 */ 370 toggle ^= 1; 371 if (numvnodes / 2 > maxvnodes) 372 toggle = 0; 373 374 s = splbio(); 375 if ((numvnodes < maxvnodes) || 376 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 377 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 378 splx(s); 379 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 380 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 381 vp->v_uvm->u_vnode = vp; 382 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 383 cache_tree_init(&vp->v_nc_tree); 384 TAILQ_INIT(&vp->v_cache_dst); 385 numvnodes++; 386 } else { 387 TAILQ_FOREACH(vp, listhd, v_freelist) { 388 if (VOP_ISLOCKED(vp) == 0) 389 break; 390 } 391 /* 392 * Unless this is a bad time of the month, at most 393 * the first NCPUS items on the free list are 394 * locked, so this is close enough to being empty. 395 */ 396 if (vp == NULL) { 397 splx(s); 398 tablefull("vnode"); 399 *vpp = 0; 400 return (ENFILE); 401 } 402 403#ifdef DIAGNOSTIC 404 if (vp->v_usecount) { 405 vprint("free vnode", vp); 406 panic("free vnode isn't"); 407 } 408#endif 409 410 TAILQ_REMOVE(listhd, vp, v_freelist); 411 vp->v_bioflag &= ~VBIOONFREELIST; 412 splx(s); 413 414 if (vp->v_type != VBAD) 415 vgonel(vp, p); 416#ifdef DIAGNOSTIC 417 if (vp->v_data) { 418 vprint("cleaned vnode", vp); 419 panic("cleaned vnode isn't"); 420 } 421 s = splbio(); 422 if (vp->v_numoutput) 423 panic("Clean vnode has pending I/O's"); 424 splx(s); 425#endif 426 vp->v_flag = 0; 427 vp->v_socket = 0; 428 } 429 cache_purge(vp); 430 vp->v_type = VNON; 431 vp->v_tag = tag; 432 vp->v_op = vops; 433 insmntque(vp, mp); 434 *vpp = vp; 435 vp->v_usecount = 1; 436 vp->v_data = 0; 437 return (0); 438} 439 440/* 441 * Move a vnode from one mount queue to another. 442 */ 443void 444insmntque(struct vnode *vp, struct mount *mp) 445{ 446 /* 447 * Delete from old mount point vnode list, if on one. 448 */ 449 if (vp->v_mount != NULL) 450 LIST_REMOVE(vp, v_mntvnodes); 451 /* 452 * Insert into list of vnodes for the new mount point, if available. 453 */ 454 if ((vp->v_mount = mp) != NULL) 455 LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); 456} 457 458/* 459 * Create a vnode for a block device. 460 * Used for root filesystem, argdev, and swap areas. 461 * Also used for memory file system special devices. 462 */ 463int 464bdevvp(dev_t dev, struct vnode **vpp) 465{ 466 return (getdevvp(dev, vpp, VBLK)); 467} 468 469/* 470 * Create a vnode for a character device. 471 * Used for console handling. 472 */ 473int 474cdevvp(dev_t dev, struct vnode **vpp) 475{ 476 return (getdevvp(dev, vpp, VCHR)); 477} 478 479/* 480 * Create a vnode for a device. 481 * Used by bdevvp (block device) for root file system etc., 482 * and by cdevvp (character device) for console. 483 */ 484int 485getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 486{ 487 struct vnode *vp; 488 struct vnode *nvp; 489 int error; 490 491 if (dev == NODEV) { 492 *vpp = NULLVP; 493 return (0); 494 } 495 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 496 if (error) { 497 *vpp = NULLVP; 498 return (error); 499 } 500 vp = nvp; 501 vp->v_type = type; 502 if ((nvp = checkalias(vp, dev, NULL)) != 0) { 503 vput(vp); 504 vp = nvp; 505 } 506 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 507 vp->v_flag |= VISTTY; 508 *vpp = vp; 509 return (0); 510} 511 512/* 513 * Check to see if the new vnode represents a special device 514 * for which we already have a vnode (either because of 515 * bdevvp() or because of a different vnode representing 516 * the same block device). If such an alias exists, deallocate 517 * the existing contents and return the aliased vnode. The 518 * caller is responsible for filling it with its new contents. 519 */ 520struct vnode * 521checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 522{ 523 struct proc *p = curproc; 524 struct vnode *vp; 525 struct vnode **vpp; 526 527 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 528 return (NULLVP); 529 530 vpp = &speclisth[SPECHASH(nvp_rdev)]; 531loop: 532 for (vp = *vpp; vp; vp = vp->v_specnext) { 533 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 534 continue; 535 } 536 /* 537 * Alias, but not in use, so flush it out. 538 */ 539 if (vp->v_usecount == 0) { 540 vgonel(vp, p); 541 goto loop; 542 } 543 if (vget(vp, LK_EXCLUSIVE, p)) { 544 goto loop; 545 } 546 break; 547 } 548 549 /* 550 * Common case is actually in the if statement 551 */ 552 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 553 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 554 M_WAITOK); 555 nvp->v_rdev = nvp_rdev; 556 nvp->v_hashchain = vpp; 557 nvp->v_specnext = *vpp; 558 nvp->v_specmountpoint = NULL; 559 nvp->v_speclockf = NULL; 560 nvp->v_specbitmap = NULL; 561 if (nvp->v_type == VCHR && 562 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 563 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 564 if (vp != NULLVP) 565 nvp->v_specbitmap = vp->v_specbitmap; 566 else 567 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 568 M_VNODE, M_WAITOK | M_ZERO); 569 } 570 *vpp = nvp; 571 if (vp != NULLVP) { 572 nvp->v_flag |= VALIASED; 573 vp->v_flag |= VALIASED; 574 vput(vp); 575 } 576 return (NULLVP); 577 } 578 579 /* 580 * This code is the uncommon case. It is called in case 581 * we found an alias that was VT_NON && vtype of VBLK 582 * This means we found a block device that was created 583 * using bdevvp. 584 * An example of such a vnode is the root partition device vnode 585 * created in ffs_mountroot. 586 * 587 * The vnodes created by bdevvp should not be aliased (why?). 588 */ 589 590 VOP_UNLOCK(vp); 591 vclean(vp, 0, p); 592 vp->v_op = nvp->v_op; 593 vp->v_tag = nvp->v_tag; 594 nvp->v_type = VNON; 595 insmntque(vp, mp); 596 return (vp); 597} 598 599/* 600 * Grab a particular vnode from the free list, increment its 601 * reference count and lock it. If the vnode lock bit is set, 602 * the vnode is being eliminated in vgone. In that case, we 603 * cannot grab it, so the process is awakened when the 604 * transition is completed, and an error code is returned to 605 * indicate that the vnode is no longer usable, possibly 606 * having been changed to a new file system type. 607 */ 608int 609vget(struct vnode *vp, int flags, struct proc *p) 610{ 611 int error, s, onfreelist; 612 613 /* 614 * If the vnode is in the process of being cleaned out for 615 * another use, we wait for the cleaning to finish and then 616 * return failure. Cleaning is determined by checking that 617 * the VXLOCK flag is set. 618 */ 619 620 if (vp->v_flag & VXLOCK) { 621 if (flags & LK_NOWAIT) { 622 return (EBUSY); 623 } 624 625 vp->v_flag |= VXWANT; 626 tsleep(vp, PINOD, "vget", 0); 627 return (ENOENT); 628 } 629 630 onfreelist = vp->v_bioflag & VBIOONFREELIST; 631 if (vp->v_usecount == 0 && onfreelist) { 632 s = splbio(); 633 if (vp->v_holdcnt > 0) 634 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 635 else 636 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 637 vp->v_bioflag &= ~VBIOONFREELIST; 638 splx(s); 639 } 640 641 vp->v_usecount++; 642 if (flags & LK_TYPE_MASK) { 643 if ((error = vn_lock(vp, flags)) != 0) { 644 vp->v_usecount--; 645 if (vp->v_usecount == 0 && onfreelist) 646 vputonfreelist(vp); 647 } 648 return (error); 649 } 650 651 return (0); 652} 653 654 655/* Vnode reference. */ 656void 657vref(struct vnode *vp) 658{ 659#ifdef DIAGNOSTIC 660 if (vp->v_usecount == 0) 661 panic("vref used where vget required"); 662 if (vp->v_type == VNON) 663 panic("vref on a VNON vnode"); 664#endif 665 vp->v_usecount++; 666} 667 668void 669vputonfreelist(struct vnode *vp) 670{ 671 int s; 672 struct freelst *lst; 673 674 s = splbio(); 675#ifdef DIAGNOSTIC 676 if (vp->v_usecount != 0) 677 panic("Use count is not zero!"); 678 679 if (vp->v_bioflag & VBIOONFREELIST) { 680 vprint("vnode already on free list: ", vp); 681 panic("vnode already on free list"); 682 } 683#endif 684 685 vp->v_bioflag |= VBIOONFREELIST; 686 687 if (vp->v_holdcnt > 0) 688 lst = &vnode_hold_list; 689 else 690 lst = &vnode_free_list; 691 692 if (vp->v_type == VBAD) 693 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 694 else 695 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 696 697 splx(s); 698} 699 700/* 701 * vput(), just unlock and vrele() 702 */ 703void 704vput(struct vnode *vp) 705{ 706 struct proc *p = curproc; 707 708#ifdef DIAGNOSTIC 709 if (vp == NULL) 710 panic("vput: null vp"); 711#endif 712 713#ifdef DIAGNOSTIC 714 if (vp->v_usecount == 0) { 715 vprint("vput: bad ref count", vp); 716 panic("vput: ref cnt"); 717 } 718#endif 719 vp->v_usecount--; 720 if (vp->v_usecount > 0) { 721 VOP_UNLOCK(vp); 722 return; 723 } 724 725#ifdef DIAGNOSTIC 726 if (vp->v_writecount != 0) { 727 vprint("vput: bad writecount", vp); 728 panic("vput: v_writecount != 0"); 729 } 730#endif 731 732 VOP_INACTIVE(vp, p); 733 734 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 735 vputonfreelist(vp); 736} 737 738/* 739 * Vnode release - use for active VNODES. 740 * If count drops to zero, call inactive routine and return to freelist. 741 * Returns 0 if it did not sleep. 742 */ 743int 744vrele(struct vnode *vp) 745{ 746 struct proc *p = curproc; 747 748#ifdef DIAGNOSTIC 749 if (vp == NULL) 750 panic("vrele: null vp"); 751#endif 752#ifdef DIAGNOSTIC 753 if (vp->v_usecount == 0) { 754 vprint("vrele: bad ref count", vp); 755 panic("vrele: ref cnt"); 756 } 757#endif 758 vp->v_usecount--; 759 if (vp->v_usecount > 0) { 760 return (0); 761 } 762 763#ifdef DIAGNOSTIC 764 if (vp->v_writecount != 0) { 765 vprint("vrele: bad writecount", vp); 766 panic("vrele: v_writecount != 0"); 767 } 768#endif 769 770 if (vn_lock(vp, LK_EXCLUSIVE)) { 771#ifdef DIAGNOSTIC 772 vprint("vrele: cannot lock", vp); 773#endif 774 return (1); 775 } 776 777 VOP_INACTIVE(vp, p); 778 779 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 780 vputonfreelist(vp); 781 return (1); 782} 783 784/* Page or buffer structure gets a reference. */ 785void 786vhold(struct vnode *vp) 787{ 788 /* 789 * If it is on the freelist and the hold count is currently 790 * zero, move it to the hold list. 791 */ 792 if ((vp->v_bioflag & VBIOONFREELIST) && 793 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 794 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 795 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 796 } 797 vp->v_holdcnt++; 798} 799 800/* Lose interest in a vnode. */ 801void 802vdrop(struct vnode *vp) 803{ 804#ifdef DIAGNOSTIC 805 if (vp->v_holdcnt == 0) 806 panic("vdrop: zero holdcnt"); 807#endif 808 809 vp->v_holdcnt--; 810 811 /* 812 * If it is on the holdlist and the hold count drops to 813 * zero, move it to the free list. 814 */ 815 if ((vp->v_bioflag & VBIOONFREELIST) && 816 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 817 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 818 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 819 } 820} 821 822/* 823 * Remove any vnodes in the vnode table belonging to mount point mp. 824 * 825 * If MNT_NOFORCE is specified, there should not be any active ones, 826 * return error if any are found (nb: this is a user error, not a 827 * system error). If MNT_FORCE is specified, detach any active vnodes 828 * that are found. 829 */ 830#ifdef DEBUG 831int busyprt = 0; /* print out busy vnodes */ 832struct ctldebug debug1 = { "busyprt", &busyprt }; 833#endif 834 835int 836vfs_mount_foreach_vnode(struct mount *mp, 837 int (*func)(struct vnode *, void *), void *arg) { 838 struct vnode *vp, *nvp; 839 int error = 0; 840 841loop: 842 LIST_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 843 if (vp->v_mount != mp) 844 goto loop; 845 846 error = func(vp, arg); 847 848 if (error != 0) 849 break; 850 } 851 852 return (error); 853} 854 855struct vflush_args { 856 struct vnode *skipvp; 857 int busy; 858 int flags; 859}; 860 861int 862vflush_vnode(struct vnode *vp, void *arg) 863{ 864 struct vflush_args *va = arg; 865 struct proc *p = curproc; 866 867 if (vp == va->skipvp) { 868 return (0); 869 } 870 871 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 872 return (0); 873 } 874 875 /* 876 * If WRITECLOSE is set, only flush out regular file 877 * vnodes open for writing. 878 */ 879 if ((va->flags & WRITECLOSE) && 880 (vp->v_writecount == 0 || vp->v_type != VREG)) { 881 return (0); 882 } 883 884 /* 885 * With v_usecount == 0, all we need to do is clear 886 * out the vnode data structures and we are done. 887 */ 888 if (vp->v_usecount == 0) { 889 vgonel(vp, p); 890 return (0); 891 } 892 893 /* 894 * If FORCECLOSE is set, forcibly close the vnode. 895 * For block or character devices, revert to an 896 * anonymous device. For all other files, just kill them. 897 */ 898 if (va->flags & FORCECLOSE) { 899 if (vp->v_type != VBLK && vp->v_type != VCHR) { 900 vgonel(vp, p); 901 } else { 902 vclean(vp, 0, p); 903 vp->v_op = &spec_vops; 904 insmntque(vp, NULL); 905 } 906 return (0); 907 } 908 909 /* 910 * If set, this is allowed to ignore vnodes which don't 911 * have changes pending to disk. 912 * XXX Might be nice to check per-fs "inode" flags, but 913 * generally the filesystem is sync'd already, right? 914 */ 915 if ((va->flags & IGNORECLEAN) && 916 LIST_EMPTY(&vp->v_dirtyblkhd)) 917 return (0); 918 919#ifdef DEBUG 920 if (busyprt) 921 vprint("vflush: busy vnode", vp); 922#endif 923 va->busy++; 924 return (0); 925} 926 927int 928vflush(struct mount *mp, struct vnode *skipvp, int flags) 929{ 930 struct vflush_args va; 931 va.skipvp = skipvp; 932 va.busy = 0; 933 va.flags = flags; 934 935 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 936 937 if (va.busy) 938 return (EBUSY); 939 return (0); 940} 941 942/* 943 * Disassociate the underlying file system from a vnode. 944 */ 945void 946vclean(struct vnode *vp, int flags, struct proc *p) 947{ 948 int active; 949 950 /* 951 * Check to see if the vnode is in use. 952 * If so we have to reference it before we clean it out 953 * so that its count cannot fall to zero and generate a 954 * race against ourselves to recycle it. 955 */ 956 if ((active = vp->v_usecount) != 0) 957 vp->v_usecount++; 958 959 /* 960 * Prevent the vnode from being recycled or 961 * brought into use while we clean it out. 962 */ 963 if (vp->v_flag & VXLOCK) 964 panic("vclean: deadlock"); 965 vp->v_flag |= VXLOCK; 966 /* 967 * Even if the count is zero, the VOP_INACTIVE routine may still 968 * have the object locked while it cleans it out. The VOP_LOCK 969 * ensures that the VOP_INACTIVE routine is done with its work. 970 * For active vnodes, it ensures that no other activity can 971 * occur while the underlying object is being cleaned out. 972 */ 973 VOP_LOCK(vp, LK_DRAIN | LK_EXCLUSIVE); 974 975 /* 976 * Clean out any VM data associated with the vnode. 977 */ 978 uvm_vnp_terminate(vp); 979 /* 980 * Clean out any buffers associated with the vnode. 981 */ 982 if (flags & DOCLOSE) 983 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0); 984 /* 985 * If purging an active vnode, it must be closed and 986 * deactivated before being reclaimed. Note that the 987 * VOP_INACTIVE will unlock the vnode 988 */ 989 if (active) { 990 if (flags & DOCLOSE) 991 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 992 VOP_INACTIVE(vp, p); 993 } else { 994 /* 995 * Any other processes trying to obtain this lock must first 996 * wait for VXLOCK to clear, then call the new lock operation. 997 */ 998 VOP_UNLOCK(vp); 999 } 1000 1001 /* 1002 * Reclaim the vnode. 1003 */ 1004 if (VOP_RECLAIM(vp, p)) 1005 panic("vclean: cannot reclaim"); 1006 if (active) { 1007 vp->v_usecount--; 1008 if (vp->v_usecount == 0) { 1009 if (vp->v_holdcnt > 0) 1010 panic("vclean: not clean"); 1011 vputonfreelist(vp); 1012 } 1013 } 1014 cache_purge(vp); 1015 1016 /* 1017 * Done with purge, notify sleepers of the grim news. 1018 */ 1019 vp->v_op = &dead_vops; 1020 VN_KNOTE(vp, NOTE_REVOKE); 1021 vp->v_tag = VT_NON; 1022 vp->v_flag &= ~VXLOCK; 1023#ifdef VFSLCKDEBUG 1024 vp->v_flag &= ~VLOCKSWORK; 1025#endif 1026 if (vp->v_flag & VXWANT) { 1027 vp->v_flag &= ~VXWANT; 1028 wakeup(vp); 1029 } 1030} 1031 1032/* 1033 * Recycle an unused vnode to the front of the free list. 1034 */ 1035int 1036vrecycle(struct vnode *vp, struct proc *p) 1037{ 1038 if (vp->v_usecount == 0) { 1039 vgonel(vp, p); 1040 return (1); 1041 } 1042 return (0); 1043} 1044 1045/* 1046 * Eliminate all activity associated with a vnode 1047 * in preparation for reuse. 1048 */ 1049void 1050vgone(struct vnode *vp) 1051{ 1052 struct proc *p = curproc; 1053 vgonel(vp, p); 1054} 1055 1056/* 1057 * vgone, with struct proc. 1058 */ 1059void 1060vgonel(struct vnode *vp, struct proc *p) 1061{ 1062 struct vnode *vq; 1063 struct vnode *vx; 1064 1065 /* 1066 * If a vgone (or vclean) is already in progress, 1067 * wait until it is done and return. 1068 */ 1069 if (vp->v_flag & VXLOCK) { 1070 vp->v_flag |= VXWANT; 1071 tsleep(vp, PINOD, "vgone", 0); 1072 return; 1073 } 1074 1075 /* 1076 * Clean out the filesystem specific data. 1077 */ 1078 vclean(vp, DOCLOSE, p); 1079 /* 1080 * Delete from old mount point vnode list, if on one. 1081 */ 1082 if (vp->v_mount != NULL) 1083 insmntque(vp, NULL); 1084 /* 1085 * If special device, remove it from special device alias list 1086 * if it is on one. 1087 */ 1088 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) { 1089 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1090 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1091 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1092 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1093 } 1094 if (*vp->v_hashchain == vp) { 1095 *vp->v_hashchain = vp->v_specnext; 1096 } else { 1097 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1098 if (vq->v_specnext != vp) 1099 continue; 1100 vq->v_specnext = vp->v_specnext; 1101 break; 1102 } 1103 if (vq == NULL) 1104 panic("missing bdev"); 1105 } 1106 if (vp->v_flag & VALIASED) { 1107 vx = NULL; 1108 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1109 if (vq->v_rdev != vp->v_rdev || 1110 vq->v_type != vp->v_type) 1111 continue; 1112 if (vx) 1113 break; 1114 vx = vq; 1115 } 1116 if (vx == NULL) 1117 panic("missing alias"); 1118 if (vq == NULL) 1119 vx->v_flag &= ~VALIASED; 1120 vp->v_flag &= ~VALIASED; 1121 } 1122 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1123 vp->v_specinfo = NULL; 1124 } 1125 /* 1126 * If it is on the freelist and not already at the head, 1127 * move it to the head of the list. 1128 */ 1129 vp->v_type = VBAD; 1130 1131 /* 1132 * Move onto the free list, unless we were called from 1133 * getnewvnode and we're not on any free list 1134 */ 1135 if (vp->v_usecount == 0 && 1136 (vp->v_bioflag & VBIOONFREELIST)) { 1137 int s; 1138 1139 s = splbio(); 1140 1141 if (vp->v_holdcnt > 0) 1142 panic("vgonel: not clean"); 1143 1144 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1145 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1146 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1147 } 1148 splx(s); 1149 } 1150} 1151 1152/* 1153 * Lookup a vnode by device number. 1154 */ 1155int 1156vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1157{ 1158 struct vnode *vp; 1159 int rc =0; 1160 1161 for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { 1162 if (dev != vp->v_rdev || type != vp->v_type) 1163 continue; 1164 *vpp = vp; 1165 rc = 1; 1166 break; 1167 } 1168 return (rc); 1169} 1170 1171/* 1172 * Revoke all the vnodes corresponding to the specified minor number 1173 * range (endpoints inclusive) of the specified major. 1174 */ 1175void 1176vdevgone(int maj, int minl, int minh, enum vtype type) 1177{ 1178 struct vnode *vp; 1179 int mn; 1180 1181 for (mn = minl; mn <= minh; mn++) 1182 if (vfinddev(makedev(maj, mn), type, &vp)) 1183 VOP_REVOKE(vp, REVOKEALL); 1184} 1185 1186/* 1187 * Calculate the total number of references to a special device. 1188 */ 1189int 1190vcount(struct vnode *vp) 1191{ 1192 struct vnode *vq, *vnext; 1193 int count; 1194 1195loop: 1196 if ((vp->v_flag & VALIASED) == 0) 1197 return (vp->v_usecount); 1198 for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { 1199 vnext = vq->v_specnext; 1200 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1201 continue; 1202 /* 1203 * Alias, but not in use, so flush it out. 1204 */ 1205 if (vq->v_usecount == 0 && vq != vp) { 1206 vgone(vq); 1207 goto loop; 1208 } 1209 count += vq->v_usecount; 1210 } 1211 return (count); 1212} 1213 1214#if defined(DEBUG) || defined(DIAGNOSTIC) 1215/* 1216 * Print out a description of a vnode. 1217 */ 1218static char *typename[] = 1219 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1220 1221void 1222vprint(char *label, struct vnode *vp) 1223{ 1224 char buf[64]; 1225 1226 if (label != NULL) 1227 printf("%s: ", label); 1228 printf("%p, type %s, use %u, write %u, hold %u,", 1229 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1230 vp->v_holdcnt); 1231 buf[0] = '\0'; 1232 if (vp->v_flag & VROOT) 1233 strlcat(buf, "|VROOT", sizeof buf); 1234 if (vp->v_flag & VTEXT) 1235 strlcat(buf, "|VTEXT", sizeof buf); 1236 if (vp->v_flag & VSYSTEM) 1237 strlcat(buf, "|VSYSTEM", sizeof buf); 1238 if (vp->v_flag & VXLOCK) 1239 strlcat(buf, "|VXLOCK", sizeof buf); 1240 if (vp->v_flag & VXWANT) 1241 strlcat(buf, "|VXWANT", sizeof buf); 1242 if (vp->v_bioflag & VBIOWAIT) 1243 strlcat(buf, "|VBIOWAIT", sizeof buf); 1244 if (vp->v_bioflag & VBIOONFREELIST) 1245 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1246 if (vp->v_bioflag & VBIOONSYNCLIST) 1247 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1248 if (vp->v_flag & VALIASED) 1249 strlcat(buf, "|VALIASED", sizeof buf); 1250 if (buf[0] != '\0') 1251 printf(" flags (%s)", &buf[1]); 1252 if (vp->v_data == NULL) { 1253 printf("\n"); 1254 } else { 1255 printf("\n\t"); 1256 VOP_PRINT(vp); 1257 } 1258} 1259#endif /* DEBUG || DIAGNOSTIC */ 1260 1261#ifdef DEBUG 1262/* 1263 * List all of the locked vnodes in the system. 1264 * Called when debugging the kernel. 1265 */ 1266void 1267printlockedvnodes(void) 1268{ 1269 struct mount *mp; 1270 struct vnode *vp; 1271 1272 printf("Locked vnodes\n"); 1273 1274 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1275 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1276 continue; 1277 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1278 if (VOP_ISLOCKED(vp)) 1279 vprint(NULL, vp); 1280 } 1281 vfs_unbusy(mp); 1282 } 1283 1284} 1285#endif 1286 1287/* 1288 * Top level filesystem related information gathering. 1289 */ 1290int 1291vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1292 size_t newlen, struct proc *p) 1293{ 1294 struct vfsconf *vfsp, *tmpvfsp; 1295 int ret; 1296 1297 /* all sysctl names at this level are at least name and field */ 1298 if (namelen < 2) 1299 return (ENOTDIR); /* overloaded */ 1300 1301 if (name[0] != VFS_GENERIC) { 1302 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1303 if (vfsp->vfc_typenum == name[0]) 1304 break; 1305 1306 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1307 return (EOPNOTSUPP); 1308 1309 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1310 oldp, oldlenp, newp, newlen, p)); 1311 } 1312 1313 switch (name[1]) { 1314 case VFS_MAXTYPENUM: 1315 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1316 1317 case VFS_CONF: 1318 if (namelen < 3) 1319 return (ENOTDIR); /* overloaded */ 1320 1321 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 1322 if (vfsp->vfc_typenum == name[2]) 1323 break; 1324 1325 if (vfsp == NULL) 1326 return (EOPNOTSUPP); 1327 1328 /* Make a copy, clear out kernel pointers */ 1329 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1330 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1331 tmpvfsp->vfc_vfsops = NULL; 1332 tmpvfsp->vfc_next = NULL; 1333 1334 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1335 sizeof(struct vfsconf)); 1336 1337 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1338 return (ret); 1339 case VFS_BCACHESTAT: /* buffer cache statistics */ 1340 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1341 sizeof(struct bcachestats)); 1342 return(ret); 1343 } 1344 return (EOPNOTSUPP); 1345} 1346 1347/* 1348 * Check to see if a filesystem is mounted on a block device. 1349 */ 1350int 1351vfs_mountedon(struct vnode *vp) 1352{ 1353 struct vnode *vq; 1354 int error = 0; 1355 1356 if (vp->v_specmountpoint != NULL) 1357 return (EBUSY); 1358 if (vp->v_flag & VALIASED) { 1359 for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { 1360 if (vq->v_rdev != vp->v_rdev || 1361 vq->v_type != vp->v_type) 1362 continue; 1363 if (vq->v_specmountpoint != NULL) { 1364 error = EBUSY; 1365 break; 1366 } 1367 } 1368 } 1369 return (error); 1370} 1371 1372#ifdef NFSSERVER 1373/* 1374 * Build hash lists of net addresses and hang them off the mount point. 1375 * Called by vfs_export() to set up the lists of export addresses. 1376 */ 1377int 1378vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1379 struct export_args *argp) 1380{ 1381 struct netcred *np; 1382 struct radix_node_head *rnh; 1383 int nplen, i; 1384 struct radix_node *rn; 1385 struct sockaddr *saddr, *smask = 0; 1386 int error; 1387 1388 if (argp->ex_addrlen == 0) { 1389 if (mp->mnt_flag & MNT_DEFEXPORTED) 1390 return (EPERM); 1391 np = &nep->ne_defexported; 1392 /* fill in the kernel's ucred from userspace's xucred */ 1393 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1394 return (error); 1395 mp->mnt_flag |= MNT_DEFEXPORTED; 1396 goto finish; 1397 } 1398 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1399 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1400 return (EINVAL); 1401 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1402 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1403 saddr = (struct sockaddr *)(np + 1); 1404 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1405 if (error) 1406 goto out; 1407 if (saddr->sa_len > argp->ex_addrlen) 1408 saddr->sa_len = argp->ex_addrlen; 1409 if (argp->ex_masklen) { 1410 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1411 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1412 if (error) 1413 goto out; 1414 if (smask->sa_len > argp->ex_masklen) 1415 smask->sa_len = argp->ex_masklen; 1416 } 1417 /* fill in the kernel's ucred from userspace's xucred */ 1418 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1419 goto out; 1420 i = saddr->sa_family; 1421 switch (i) { 1422 case AF_INET: 1423 if ((rnh = nep->ne_rtable_inet) == NULL) { 1424 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1425 offsetof(struct sockaddr_in, sin_addr))) { 1426 error = ENOBUFS; 1427 goto out; 1428 } 1429 rnh = nep->ne_rtable_inet; 1430 } 1431 break; 1432 default: 1433 error = EINVAL; 1434 goto out; 1435 } 1436 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1437 if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ 1438 error = EPERM; 1439 goto out; 1440 } 1441finish: 1442 np->netc_exflags = argp->ex_flags; 1443 return (0); 1444out: 1445 free(np, M_NETADDR, nplen); 1446 return (error); 1447} 1448 1449int 1450vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1451{ 1452 struct radix_node_head *rnh = (struct radix_node_head *)w; 1453 1454 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1455 free(rn, M_NETADDR, 0); 1456 return (0); 1457} 1458 1459/* 1460 * Free the net address hash lists that are hanging off the mount points. 1461 */ 1462void 1463vfs_free_addrlist(struct netexport *nep) 1464{ 1465 struct radix_node_head *rnh; 1466 1467 if ((rnh = nep->ne_rtable_inet) != NULL) { 1468 rn_walktree(rnh, vfs_free_netcred, rnh); 1469 free(rnh, M_RTABLE, 0); 1470 nep->ne_rtable_inet = NULL; 1471 } 1472} 1473#endif /* NFSSERVER */ 1474 1475int 1476vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1477{ 1478#ifdef NFSSERVER 1479 int error; 1480 1481 if (argp->ex_flags & MNT_DELEXPORT) { 1482 vfs_free_addrlist(nep); 1483 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1484 } 1485 if (argp->ex_flags & MNT_EXPORTED) { 1486 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1487 return (error); 1488 mp->mnt_flag |= MNT_EXPORTED; 1489 } 1490 return (0); 1491#else 1492 return (ENOTSUP); 1493#endif /* NFSSERVER */ 1494} 1495 1496struct netcred * 1497vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1498{ 1499#ifdef NFSSERVER 1500 struct netcred *np; 1501 struct radix_node_head *rnh; 1502 struct sockaddr *saddr; 1503 1504 np = NULL; 1505 if (mp->mnt_flag & MNT_EXPORTED) { 1506 /* 1507 * Lookup in the export list first. 1508 */ 1509 if (nam != NULL) { 1510 saddr = mtod(nam, struct sockaddr *); 1511 switch(saddr->sa_family) { 1512 case AF_INET: 1513 rnh = nep->ne_rtable_inet; 1514 break; 1515 default: 1516 rnh = NULL; 1517 break; 1518 } 1519 if (rnh != NULL) 1520 np = (struct netcred *)rn_match(saddr, rnh); 1521 } 1522 /* 1523 * If no address match, use the default if it exists. 1524 */ 1525 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1526 np = &nep->ne_defexported; 1527 } 1528 return (np); 1529#else 1530 return (NULL); 1531#endif /* NFSSERVER */ 1532} 1533 1534/* 1535 * Do the usual access checking. 1536 * file_mode, uid and gid are from the vnode in question, 1537 * while acc_mode and cred are from the VOP_ACCESS parameter list 1538 */ 1539int 1540vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1541 mode_t acc_mode, struct ucred *cred) 1542{ 1543 mode_t mask; 1544 1545 /* User id 0 always gets read/write access. */ 1546 if (cred->cr_uid == 0) { 1547 /* For VEXEC, at least one of the execute bits must be set. */ 1548 if ((acc_mode & VEXEC) && type != VDIR && 1549 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1550 return EACCES; 1551 return 0; 1552 } 1553 1554 mask = 0; 1555 1556 /* Otherwise, check the owner. */ 1557 if (cred->cr_uid == uid) { 1558 if (acc_mode & VEXEC) 1559 mask |= S_IXUSR; 1560 if (acc_mode & VREAD) 1561 mask |= S_IRUSR; 1562 if (acc_mode & VWRITE) 1563 mask |= S_IWUSR; 1564 return (file_mode & mask) == mask ? 0 : EACCES; 1565 } 1566 1567 /* Otherwise, check the groups. */ 1568 if (groupmember(gid, cred)) { 1569 if (acc_mode & VEXEC) 1570 mask |= S_IXGRP; 1571 if (acc_mode & VREAD) 1572 mask |= S_IRGRP; 1573 if (acc_mode & VWRITE) 1574 mask |= S_IWGRP; 1575 return (file_mode & mask) == mask ? 0 : EACCES; 1576 } 1577 1578 /* Otherwise, check everyone else. */ 1579 if (acc_mode & VEXEC) 1580 mask |= S_IXOTH; 1581 if (acc_mode & VREAD) 1582 mask |= S_IROTH; 1583 if (acc_mode & VWRITE) 1584 mask |= S_IWOTH; 1585 return (file_mode & mask) == mask ? 0 : EACCES; 1586} 1587 1588struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1589 1590int 1591vfs_stall(struct proc *p, int stall) 1592{ 1593 struct mount *mp; 1594 int allerror = 0, error; 1595 1596 if (stall) 1597 rw_enter_write(&vfs_stall_lock); 1598 1599 /* 1600 * The loop variable mp is protected by vfs_busy() so that it cannot 1601 * be unmounted while VFS_SYNC() sleeps. 1602 */ 1603 TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { 1604 if (stall) { 1605 error = vfs_busy(mp, VB_WRITE|VB_WAIT); 1606 if (error) { 1607 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1608 allerror = error; 1609 continue; 1610 } 1611 uvm_vnp_sync(mp); 1612 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1613 if (error) { 1614 printf("%s: failed to sync\n", mp->mnt_stat.f_mntonname); 1615 vfs_unbusy(mp); 1616 allerror = error; 1617 continue; 1618 } 1619 mp->mnt_flag |= MNT_STALLED; 1620 } else { 1621 if (mp->mnt_flag & MNT_STALLED) { 1622 vfs_unbusy(mp); 1623 mp->mnt_flag &= ~MNT_STALLED; 1624 } 1625 } 1626 } 1627 1628 if (!stall) 1629 rw_exit_write(&vfs_stall_lock); 1630 1631 return (allerror); 1632} 1633 1634void 1635vfs_stall_barrier(void) 1636{ 1637 rw_enter_read(&vfs_stall_lock); 1638 rw_exit_read(&vfs_stall_lock); 1639} 1640 1641/* 1642 * Unmount all file systems. 1643 * We traverse the list in reverse order under the assumption that doing so 1644 * will avoid needing to worry about dependencies. 1645 */ 1646void 1647vfs_unmountall(void) 1648{ 1649 struct mount *mp, *nmp; 1650 int allerror, error, again = 1; 1651 1652 retry: 1653 allerror = 0; 1654 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1655 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1656 continue; 1657 /* XXX Here is a race, the next pointer is not locked. */ 1658 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1659 printf("unmount of %s failed with error %d\n", 1660 mp->mnt_stat.f_mntonname, error); 1661 allerror = 1; 1662 } 1663 } 1664 1665 if (allerror) { 1666 printf("WARNING: some file systems would not unmount\n"); 1667 if (again) { 1668 printf("retrying\n"); 1669 again = 0; 1670 goto retry; 1671 } 1672 } 1673} 1674 1675/* 1676 * Sync and unmount file systems before shutting down. 1677 */ 1678void 1679vfs_shutdown(struct proc *p) 1680{ 1681#ifdef ACCOUNTING 1682 acct_shutdown(); 1683#endif 1684 1685 printf("syncing disks... "); 1686 1687 if (panicstr == 0) { 1688 /* Sync before unmount, in case we hang on something. */ 1689 sys_sync(p, NULL, NULL); 1690 vfs_unmountall(); 1691 } 1692 1693#if NSOFTRAID > 0 1694 sr_quiesce(); 1695#endif 1696 1697 if (vfs_syncwait(p, 1)) 1698 printf("giving up\n"); 1699 else 1700 printf("done\n"); 1701} 1702 1703/* 1704 * perform sync() operation and wait for buffers to flush. 1705 */ 1706int 1707vfs_syncwait(struct proc *p, int verbose) 1708{ 1709 struct buf *bp; 1710 int iter, nbusy, dcount, s; 1711#ifdef MULTIPROCESSOR 1712 int hold_count; 1713#endif 1714 1715 sys_sync(p, NULL, NULL); 1716 1717 /* Wait for sync to finish. */ 1718 dcount = 10000; 1719 for (iter = 0; iter < 20; iter++) { 1720 nbusy = 0; 1721 LIST_FOREACH(bp, &bufhead, b_list) { 1722 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1723 nbusy++; 1724 /* 1725 * With soft updates, some buffers that are 1726 * written will be remarked as dirty until other 1727 * buffers are written. 1728 */ 1729 if (bp->b_flags & B_DELWRI) { 1730 s = splbio(); 1731 bremfree(bp); 1732 buf_acquire(bp); 1733 splx(s); 1734 nbusy++; 1735 bawrite(bp); 1736 if (dcount-- <= 0) { 1737 if (verbose) 1738 printf("softdep "); 1739 return 1; 1740 } 1741 } 1742 } 1743 if (nbusy == 0) 1744 break; 1745 if (verbose) 1746 printf("%d ", nbusy); 1747#ifdef MULTIPROCESSOR 1748 if (_kernel_lock_held()) 1749 hold_count = __mp_release_all(&kernel_lock); 1750 else 1751 hold_count = 0; 1752#endif 1753 DELAY(40000 * iter); 1754#ifdef MULTIPROCESSOR 1755 if (hold_count) 1756 __mp_acquire_count(&kernel_lock, hold_count); 1757#endif 1758 } 1759 1760 return nbusy; 1761} 1762 1763/* 1764 * posix file system related system variables. 1765 */ 1766int 1767fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1768 void *newp, size_t newlen, struct proc *p) 1769{ 1770 /* all sysctl names at this level are terminal */ 1771 if (namelen != 1) 1772 return (ENOTDIR); 1773 1774 switch (name[0]) { 1775 case FS_POSIX_SETUID: 1776 if (newp && securelevel > 0) 1777 return (EPERM); 1778 return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear)); 1779 default: 1780 return (EOPNOTSUPP); 1781 } 1782 /* NOTREACHED */ 1783} 1784 1785/* 1786 * file system related system variables. 1787 */ 1788int 1789fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1790 size_t newlen, struct proc *p) 1791{ 1792 sysctlfn *fn; 1793 1794 switch (name[0]) { 1795 case FS_POSIX: 1796 fn = fs_posix_sysctl; 1797 break; 1798 default: 1799 return (EOPNOTSUPP); 1800 } 1801 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1802} 1803 1804 1805/* 1806 * Routines dealing with vnodes and buffers 1807 */ 1808 1809/* 1810 * Wait for all outstanding I/Os to complete 1811 * 1812 * Manipulates v_numoutput. Must be called at splbio() 1813 */ 1814int 1815vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo) 1816{ 1817 int error = 0; 1818 1819 splassert(IPL_BIO); 1820 1821 while (vp->v_numoutput) { 1822 vp->v_bioflag |= VBIOWAIT; 1823 error = tsleep(&vp->v_numoutput, 1824 slpflag | (PRIBIO + 1), wmesg, timeo); 1825 if (error) 1826 break; 1827 } 1828 1829 return (error); 1830} 1831 1832/* 1833 * Update outstanding I/O count and do wakeup if requested. 1834 * 1835 * Manipulates v_numoutput. Must be called at splbio() 1836 */ 1837void 1838vwakeup(struct vnode *vp) 1839{ 1840 splassert(IPL_BIO); 1841 1842 if (vp != NULL) { 1843 if (vp->v_numoutput-- == 0) 1844 panic("vwakeup: neg numoutput"); 1845 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1846 vp->v_bioflag &= ~VBIOWAIT; 1847 wakeup(&vp->v_numoutput); 1848 } 1849 } 1850} 1851 1852/* 1853 * Flush out and invalidate all buffers associated with a vnode. 1854 * Called with the underlying object locked. 1855 */ 1856int 1857vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1858 int slpflag, int slptimeo) 1859{ 1860 struct buf *bp; 1861 struct buf *nbp, *blist; 1862 int s, error; 1863 1864#ifdef VFSLCKDEBUG 1865 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1866 panic("%s: vp isn't locked, vp %p", __func__, vp); 1867#endif 1868 1869 if (flags & V_SAVE) { 1870 s = splbio(); 1871 vwaitforio(vp, 0, "vinvalbuf", 0); 1872 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1873 splx(s); 1874 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1875 return (error); 1876 s = splbio(); 1877 if (vp->v_numoutput > 0 || 1878 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1879 panic("%s: dirty bufs, vp %p", __func__, vp); 1880 } 1881 splx(s); 1882 } 1883loop: 1884 s = splbio(); 1885 for (;;) { 1886 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1887 (flags & V_SAVEMETA)) 1888 while (blist && blist->b_lblkno < 0) 1889 blist = LIST_NEXT(blist, b_vnbufs); 1890 if (blist == NULL && 1891 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1892 (flags & V_SAVEMETA)) 1893 while (blist && blist->b_lblkno < 0) 1894 blist = LIST_NEXT(blist, b_vnbufs); 1895 if (!blist) 1896 break; 1897 1898 for (bp = blist; bp; bp = nbp) { 1899 nbp = LIST_NEXT(bp, b_vnbufs); 1900 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1901 continue; 1902 if (bp->b_flags & B_BUSY) { 1903 bp->b_flags |= B_WANTED; 1904 error = tsleep(bp, slpflag | (PRIBIO + 1), 1905 "vinvalbuf", slptimeo); 1906 if (error) { 1907 splx(s); 1908 return (error); 1909 } 1910 break; 1911 } 1912 bremfree(bp); 1913 /* 1914 * XXX Since there are no node locks for NFS, I believe 1915 * there is a slight chance that a delayed write will 1916 * occur while sleeping just above, so check for it. 1917 */ 1918 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 1919 buf_acquire(bp); 1920 splx(s); 1921 (void) VOP_BWRITE(bp); 1922 goto loop; 1923 } 1924 buf_acquire_nomap(bp); 1925 bp->b_flags |= B_INVAL; 1926 brelse(bp); 1927 } 1928 } 1929 if (!(flags & V_SAVEMETA) && 1930 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 1931 panic("%s: flush failed, vp %p", __func__, vp); 1932 splx(s); 1933 return (0); 1934} 1935 1936void 1937vflushbuf(struct vnode *vp, int sync) 1938{ 1939 struct buf *bp, *nbp; 1940 int s; 1941 1942loop: 1943 s = splbio(); 1944 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 1945 if ((bp->b_flags & B_BUSY)) 1946 continue; 1947 if ((bp->b_flags & B_DELWRI) == 0) 1948 panic("vflushbuf: not dirty"); 1949 bremfree(bp); 1950 buf_acquire(bp); 1951 splx(s); 1952 /* 1953 * Wait for I/O associated with indirect blocks to complete, 1954 * since there is no way to quickly wait for them below. 1955 */ 1956 if (bp->b_vp == vp || sync == 0) 1957 (void) bawrite(bp); 1958 else 1959 (void) bwrite(bp); 1960 goto loop; 1961 } 1962 if (sync == 0) { 1963 splx(s); 1964 return; 1965 } 1966 vwaitforio(vp, 0, "vflushbuf", 0); 1967 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1968 splx(s); 1969#ifdef DIAGNOSTIC 1970 vprint("vflushbuf: dirty", vp); 1971#endif 1972 goto loop; 1973 } 1974 splx(s); 1975} 1976 1977/* 1978 * Associate a buffer with a vnode. 1979 * 1980 * Manipulates buffer vnode queues. Must be called at splbio(). 1981 */ 1982void 1983bgetvp(struct vnode *vp, struct buf *bp) 1984{ 1985 splassert(IPL_BIO); 1986 1987 1988 if (bp->b_vp) 1989 panic("bgetvp: not free"); 1990 vhold(vp); 1991 bp->b_vp = vp; 1992 if (vp->v_type == VBLK || vp->v_type == VCHR) 1993 bp->b_dev = vp->v_rdev; 1994 else 1995 bp->b_dev = NODEV; 1996 /* 1997 * Insert onto list for new vnode. 1998 */ 1999 bufinsvn(bp, &vp->v_cleanblkhd); 2000} 2001 2002/* 2003 * Disassociate a buffer from a vnode. 2004 * 2005 * Manipulates vnode buffer queues. Must be called at splbio(). 2006 */ 2007void 2008brelvp(struct buf *bp) 2009{ 2010 struct vnode *vp; 2011 2012 splassert(IPL_BIO); 2013 2014 if ((vp = bp->b_vp) == (struct vnode *) 0) 2015 panic("brelvp: NULL"); 2016 /* 2017 * Delete from old vnode list, if on one. 2018 */ 2019 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2020 bufremvn(bp); 2021 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2022 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 2023 vp->v_bioflag &= ~VBIOONSYNCLIST; 2024 LIST_REMOVE(vp, v_synclist); 2025 } 2026 bp->b_vp = NULL; 2027 2028 vdrop(vp); 2029} 2030 2031/* 2032 * Replaces the current vnode associated with the buffer, if any, 2033 * with a new vnode. 2034 * 2035 * If an output I/O is pending on the buffer, the old vnode 2036 * I/O count is adjusted. 2037 * 2038 * Ignores vnode buffer queues. Must be called at splbio(). 2039 */ 2040void 2041buf_replacevnode(struct buf *bp, struct vnode *newvp) 2042{ 2043 struct vnode *oldvp = bp->b_vp; 2044 2045 splassert(IPL_BIO); 2046 2047 if (oldvp) 2048 brelvp(bp); 2049 2050 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2051 newvp->v_numoutput++; /* put it on swapdev */ 2052 vwakeup(oldvp); 2053 } 2054 2055 bgetvp(newvp, bp); 2056 bufremvn(bp); 2057} 2058 2059/* 2060 * Used to assign buffers to the appropriate clean or dirty list on 2061 * the vnode and to add newly dirty vnodes to the appropriate 2062 * filesystem syncer list. 2063 * 2064 * Manipulates vnode buffer queues. Must be called at splbio(). 2065 */ 2066void 2067reassignbuf(struct buf *bp) 2068{ 2069 struct buflists *listheadp; 2070 int delay; 2071 struct vnode *vp = bp->b_vp; 2072 2073 splassert(IPL_BIO); 2074 2075 /* 2076 * Delete from old vnode list, if on one. 2077 */ 2078 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2079 bufremvn(bp); 2080 2081 /* 2082 * If dirty, put on list of dirty buffers; 2083 * otherwise insert onto list of clean buffers. 2084 */ 2085 if ((bp->b_flags & B_DELWRI) == 0) { 2086 listheadp = &vp->v_cleanblkhd; 2087 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2088 LIST_FIRST(&vp->v_dirtyblkhd) == NULL) { 2089 vp->v_bioflag &= ~VBIOONSYNCLIST; 2090 LIST_REMOVE(vp, v_synclist); 2091 } 2092 } else { 2093 listheadp = &vp->v_dirtyblkhd; 2094 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2095 switch (vp->v_type) { 2096 case VDIR: 2097 delay = syncdelay / 2; 2098 break; 2099 case VBLK: 2100 if (vp->v_specmountpoint != NULL) { 2101 delay = syncdelay / 3; 2102 break; 2103 } 2104 /* FALLTHROUGH */ 2105 default: 2106 delay = syncdelay; 2107 } 2108 vn_syncer_add_to_worklist(vp, delay); 2109 } 2110 } 2111 bufinsvn(bp, listheadp); 2112} 2113 2114int 2115vfs_register(struct vfsconf *vfs) 2116{ 2117 struct vfsconf *vfsp; 2118 struct vfsconf **vfspp; 2119 2120#ifdef DIAGNOSTIC 2121 /* Paranoia? */ 2122 if (vfs->vfc_refcount != 0) 2123 printf("vfs_register called with vfc_refcount > 0\n"); 2124#endif 2125 2126 /* Check if filesystem already known */ 2127 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2128 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) 2129 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2130 return (EEXIST); 2131 2132 if (vfs->vfc_typenum > maxvfsconf) 2133 maxvfsconf = vfs->vfc_typenum; 2134 2135 vfs->vfc_next = NULL; 2136 2137 /* Add to the end of the list */ 2138 *vfspp = vfs; 2139 2140 /* Call vfs_init() */ 2141 if (vfs->vfc_vfsops->vfs_init) 2142 (*(vfs->vfc_vfsops->vfs_init))(vfs); 2143 2144 return 0; 2145} 2146 2147int 2148vfs_unregister(struct vfsconf *vfs) 2149{ 2150 struct vfsconf *vfsp; 2151 struct vfsconf **vfspp; 2152 int maxtypenum; 2153 2154 /* Find our vfsconf struct */ 2155 for (vfspp = &vfsconf, vfsp = vfsconf; vfsp; 2156 vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) { 2157 if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0) 2158 break; 2159 } 2160 2161 if (!vfsp) /* Not found */ 2162 return (ENOENT); 2163 2164 if (vfsp->vfc_refcount) /* In use */ 2165 return (EBUSY); 2166 2167 /* Remove from list and free */ 2168 *vfspp = vfsp->vfc_next; 2169 2170 maxtypenum = 0; 2171 2172 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 2173 if (vfsp->vfc_typenum > maxtypenum) 2174 maxtypenum = vfsp->vfc_typenum; 2175 2176 maxvfsconf = maxtypenum; 2177 return 0; 2178} 2179 2180/* 2181 * Check if vnode represents a disk device 2182 */ 2183int 2184vn_isdisk(struct vnode *vp, int *errp) 2185{ 2186 if (vp->v_type != VBLK && vp->v_type != VCHR) 2187 return (0); 2188 2189 return (1); 2190} 2191 2192#ifdef DDB 2193#include <machine/db_machdep.h> 2194#include <ddb/db_interface.h> 2195 2196void 2197vfs_buf_print(void *b, int full, 2198 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2199{ 2200 struct buf *bp = b; 2201 2202 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2203 " proc %p error %d flags %lb\n", 2204 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2205 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2206 2207 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2208 " data %p saveaddr %p dep %p iodone %p\n", 2209 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2210 bp->b_data, bp->b_saveaddr, 2211 LIST_FIRST(&bp->b_dep), bp->b_iodone); 2212 2213 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2214 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2215 2216#ifdef FFS_SOFTUPDATES 2217 if (full) 2218 softdep_print(bp, full, pr); 2219#endif 2220} 2221 2222const char *vtypes[] = { VTYPE_NAMES }; 2223const char *vtags[] = { VTAG_NAMES }; 2224 2225void 2226vfs_vnode_print(void *v, int full, 2227 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2228{ 2229 struct vnode *vp = v; 2230 2231 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2232 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2233 vp->v_tag, 2234 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2235 vp->v_type, vp->v_mount, vp->v_mountedhere); 2236 2237 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2238 vp->v_data, vp->v_usecount, vp->v_writecount, 2239 vp->v_holdcnt, vp->v_numoutput); 2240 2241 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2242 2243 if (full) { 2244 struct buf *bp; 2245 2246 (*pr)("clean bufs:\n"); 2247 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2248 (*pr)(" bp %p\n", bp); 2249 vfs_buf_print(bp, full, pr); 2250 } 2251 2252 (*pr)("dirty bufs:\n"); 2253 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2254 (*pr)(" bp %p\n", bp); 2255 vfs_buf_print(bp, full, pr); 2256 } 2257 } 2258} 2259 2260void 2261vfs_mount_print(struct mount *mp, int full, 2262 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2263{ 2264 struct vfsconf *vfc = mp->mnt_vfc; 2265 struct vnode *vp; 2266 int cnt; 2267 2268 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2269 mp->mnt_flag, MNT_BITS, 2270 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2271 2272 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %d flags 0x%x\n", 2273 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2274 vfc->vfc_refcount, vfc->vfc_flags); 2275 2276 (*pr)("statvfs cache: bsize %x iosize %x\nblocks %llu free %llu avail %lld\n", 2277 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2278 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2279 2280 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2281 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2282 2283 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2284 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2285 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2286 2287 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2288 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2289 2290 (*pr)(" syncreads %llu asyncreads = %llu\n", 2291 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2292 2293 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2294 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2295 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2296 2297 (*pr)("locked vnodes:"); 2298 /* XXX would take mountlist lock, except ddb has no context */ 2299 cnt = 0; 2300 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2301 if (VOP_ISLOCKED(vp)) { 2302 if (cnt == 0) 2303 (*pr)("\n %p", vp); 2304 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2305 (*pr)(",\n %p", vp); 2306 else 2307 (*pr)(", %p", vp); 2308 cnt++; 2309 } 2310 } 2311 (*pr)("\n"); 2312 2313 if (full) { 2314 (*pr)("all vnodes:"); 2315 /* XXX would take mountlist lock, except ddb has no context */ 2316 cnt = 0; 2317 LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2318 if (cnt == 0) 2319 (*pr)("\n %p", vp); 2320 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2321 (*pr)(",\n %p", vp); 2322 else 2323 (*pr)(", %p", vp); 2324 cnt++; 2325 } 2326 (*pr)("\n"); 2327 } 2328} 2329#endif /* DDB */ 2330 2331void 2332copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2333{ 2334 const struct statfs *mbp; 2335 2336 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2337 2338 if (sbp == (mbp = &mp->mnt_stat)) 2339 return; 2340 2341 sbp->f_fsid = mbp->f_fsid; 2342 sbp->f_owner = mbp->f_owner; 2343 sbp->f_flags = mbp->f_flags; 2344 sbp->f_syncwrites = mbp->f_syncwrites; 2345 sbp->f_asyncwrites = mbp->f_asyncwrites; 2346 sbp->f_syncreads = mbp->f_syncreads; 2347 sbp->f_asyncreads = mbp->f_asyncreads; 2348 sbp->f_namemax = mbp->f_namemax; 2349 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2350 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2351 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2352 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2353 sizeof(union mount_info)); 2354} 2355