1 /* $OpenBSD: vfs_subr.c,v 1.321 2024/07/12 08:15:19 beck 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/fcntl.h> 50 #include <sys/conf.h> 51 #include <sys/vnode.h> 52 #include <sys/lock.h> 53 #include <sys/lockf.h> 54 #include <sys/stat.h> 55 #include <sys/acct.h> 56 #include <sys/namei.h> 57 #include <sys/ucred.h> 58 #include <sys/buf.h> 59 #include <sys/errno.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/syscallargs.h> 63 #include <sys/pool.h> 64 #include <sys/tree.h> 65 #include <sys/specdev.h> 66 #include <sys/atomic.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 75 void sr_quiesce(void); 76 77 enum vtype iftovt_tab[16] = { 78 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 79 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 80 }; 81 82 int vttoif_tab[9] = { 83 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 84 S_IFSOCK, S_IFIFO, S_IFMT, 85 }; 86 87 int prtactive = 0; /* 1 => print out reclaim of active vnodes */ 88 int 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 99 TAILQ_HEAD(freelst, vnode); 100 struct freelst vnode_hold_list; /* list of vnodes referencing buffers */ 101 struct freelst vnode_free_list; /* vnode free list */ 102 103 struct mntlist mountlist; /* mounted filesystem list */ 104 105 void vclean(struct vnode *, int, struct proc *); 106 107 void insmntque(struct vnode *, struct mount *); 108 int getdevvp(dev_t, struct vnode **, enum vtype); 109 110 int vfs_hang_addrlist(struct mount *, struct netexport *, 111 struct export_args *); 112 int vfs_free_netcred(struct radix_node *, void *, u_int); 113 void vfs_free_addrlist(struct netexport *); 114 void vputonfreelist(struct vnode *); 115 116 int vflush_vnode(struct vnode *, void *); 117 int maxvnodes; 118 119 struct mutex vnode_mtx = MUTEX_INITIALIZER(IPL_BIO); 120 121 void vfs_unmountall(void); 122 123 #ifdef DEBUG 124 void printlockedvnodes(void); 125 #endif 126 127 struct pool vnode_pool; 128 struct pool uvm_vnode_pool; 129 130 static inline int rb_buf_compare(const struct buf *b1, const struct buf *b2); 131 RBT_GENERATE(buf_rb_bufs, buf, b_rbbufs, rb_buf_compare); 132 133 static inline int 134 rb_buf_compare(const struct buf *b1, const struct buf *b2) 135 { 136 if (b1->b_lblkno < b2->b_lblkno) 137 return(-1); 138 if (b1->b_lblkno > b2->b_lblkno) 139 return(1); 140 return(0); 141 } 142 143 /* 144 * Initialize the vnode management data structures. 145 */ 146 void 147 vntblinit(void) 148 { 149 /* buffer cache may need a vnode for each buffer */ 150 maxvnodes = 2 * initialvnodes; 151 pool_init(&vnode_pool, sizeof(struct vnode), 0, IPL_NONE, 152 PR_WAITOK, "vnodes", NULL); 153 pool_init(&uvm_vnode_pool, sizeof(struct uvm_vnode), 0, IPL_NONE, 154 PR_WAITOK, "uvmvnodes", NULL); 155 TAILQ_INIT(&vnode_hold_list); 156 TAILQ_INIT(&vnode_free_list); 157 TAILQ_INIT(&mountlist); 158 /* 159 * Initialize the filesystem syncer. 160 */ 161 vn_initialize_syncerd(); 162 163 #ifdef NFSSERVER 164 rn_init(sizeof(struct sockaddr_in)); 165 #endif /* NFSSERVER */ 166 } 167 168 /* 169 * Allocate a mount point. 170 * 171 * The returned mount point is marked as busy. 172 */ 173 struct mount * 174 vfs_mount_alloc(struct vnode *vp, struct vfsconf *vfsp) 175 { 176 struct mount *mp; 177 178 mp = malloc(sizeof(*mp), M_MOUNT, M_WAITOK|M_ZERO); 179 rw_init_flags(&mp->mnt_lock, "vfslock", RWL_IS_VNODE); 180 (void)vfs_busy(mp, VB_READ|VB_NOWAIT); 181 182 TAILQ_INIT(&mp->mnt_vnodelist); 183 mp->mnt_vnodecovered = vp; 184 185 atomic_inc_int(&vfsp->vfc_refcount); 186 mp->mnt_vfc = vfsp; 187 mp->mnt_op = vfsp->vfc_vfsops; 188 mp->mnt_flag = vfsp->vfc_flags; 189 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 190 191 return (mp); 192 } 193 194 /* 195 * Release a mount point. 196 */ 197 void 198 vfs_mount_free(struct mount *mp) 199 { 200 atomic_dec_int(&mp->mnt_vfc->vfc_refcount); 201 free(mp, M_MOUNT, sizeof(*mp)); 202 } 203 204 /* 205 * Mark a mount point as busy. Used to synchronize access and to delay 206 * unmounting. 207 * 208 * Default behaviour is to attempt getting a READ lock and in case of an 209 * ongoing unmount, to wait for it to finish and then return failure. 210 */ 211 int 212 vfs_busy(struct mount *mp, int flags) 213 { 214 int rwflags = 0; 215 216 if (flags & VB_WRITE) 217 rwflags |= RW_WRITE; 218 else 219 rwflags |= RW_READ; 220 221 if (flags & VB_WAIT) 222 rwflags |= RW_SLEEPFAIL; 223 else 224 rwflags |= RW_NOSLEEP; 225 226 #ifdef WITNESS 227 if (flags & VB_DUPOK) 228 rwflags |= RW_DUPOK; 229 #endif 230 231 if (rw_enter(&mp->mnt_lock, rwflags)) 232 return (EBUSY); 233 234 return (0); 235 } 236 237 /* 238 * Free a busy file system 239 */ 240 void 241 vfs_unbusy(struct mount *mp) 242 { 243 rw_exit(&mp->mnt_lock); 244 } 245 246 int 247 vfs_isbusy(struct mount *mp) 248 { 249 if (RWLOCK_OWNER(&mp->mnt_lock) > 0) 250 return (1); 251 else 252 return (0); 253 } 254 255 /* 256 * Lookup a filesystem type, and if found allocate and initialize 257 * a mount structure for it. 258 * 259 * Devname is usually updated by mount(8) after booting. 260 */ 261 int 262 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 263 { 264 struct vfsconf *vfsp; 265 struct mount *mp; 266 267 vfsp = vfs_byname(fstypename); 268 if (vfsp == NULL) 269 return (ENODEV); 270 mp = vfs_mount_alloc(NULLVP, vfsp); 271 mp->mnt_flag |= MNT_RDONLY; 272 mp->mnt_stat.f_mntonname[0] = '/'; 273 strlcpy(mp->mnt_stat.f_mntfromname, devname, MNAMELEN); 274 strlcpy(mp->mnt_stat.f_mntfromspec, devname, MNAMELEN); 275 *mpp = mp; 276 return (0); 277 } 278 279 /* 280 * Lookup a mount point by filesystem identifier. 281 */ 282 struct mount * 283 vfs_getvfs(fsid_t *fsid) 284 { 285 struct mount *mp; 286 287 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 288 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 289 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 290 return (mp); 291 } 292 } 293 294 return (NULL); 295 } 296 297 298 /* 299 * Get a new unique fsid 300 */ 301 void 302 vfs_getnewfsid(struct mount *mp) 303 { 304 static u_short xxxfs_mntid; 305 306 fsid_t tfsid; 307 int mtype; 308 309 mtype = mp->mnt_vfc->vfc_typenum; 310 mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); 311 mp->mnt_stat.f_fsid.val[1] = mtype; 312 if (xxxfs_mntid == 0) 313 ++xxxfs_mntid; 314 tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); 315 tfsid.val[1] = mtype; 316 if (!TAILQ_EMPTY(&mountlist)) { 317 while (vfs_getvfs(&tfsid)) { 318 tfsid.val[0]++; 319 xxxfs_mntid++; 320 } 321 } 322 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 323 } 324 325 /* 326 * Set vnode attributes to VNOVAL 327 */ 328 void 329 vattr_null(struct vattr *vap) 330 { 331 332 vap->va_type = VNON; 333 /* 334 * Don't get fancy: u_quad_t = u_int = VNOVAL leaves the u_quad_t 335 * with 2^31-1 instead of 2^64-1. Just write'm out and let 336 * the compiler do its job. 337 */ 338 vap->va_mode = VNOVAL; 339 vap->va_nlink = VNOVAL; 340 vap->va_uid = VNOVAL; 341 vap->va_gid = VNOVAL; 342 vap->va_fsid = VNOVAL; 343 vap->va_fileid = VNOVAL; 344 vap->va_size = VNOVAL; 345 vap->va_blocksize = VNOVAL; 346 vap->va_atime.tv_sec = VNOVAL; 347 vap->va_atime.tv_nsec = VNOVAL; 348 vap->va_mtime.tv_sec = VNOVAL; 349 vap->va_mtime.tv_nsec = VNOVAL; 350 vap->va_ctime.tv_sec = VNOVAL; 351 vap->va_ctime.tv_nsec = VNOVAL; 352 vap->va_gen = VNOVAL; 353 vap->va_flags = VNOVAL; 354 vap->va_rdev = VNOVAL; 355 vap->va_bytes = VNOVAL; 356 vap->va_filerev = VNOVAL; 357 vap->va_vaflags = 0; 358 } 359 360 /* 361 * Routines having to do with the management of the vnode table. 362 */ 363 long numvnodes; 364 365 /* 366 * Return the next vnode from the free list. 367 */ 368 int 369 getnewvnode(enum vtagtype tag, struct mount *mp, const struct vops *vops, 370 struct vnode **vpp) 371 { 372 struct proc *p = curproc; 373 struct freelst *listhd; 374 static int toggle; 375 struct vnode *vp; 376 int s; 377 378 /* 379 * allow maxvnodes to increase if the buffer cache itself 380 * is big enough to justify it. (we don't shrink it ever) 381 */ 382 maxvnodes = maxvnodes < bcstats.numbufs ? bcstats.numbufs 383 : maxvnodes; 384 385 /* 386 * We must choose whether to allocate a new vnode or recycle an 387 * existing one. The criterion for allocating a new one is that 388 * the total number of vnodes is less than the number desired or 389 * there are no vnodes on either free list. Generally we only 390 * want to recycle vnodes that have no buffers associated with 391 * them, so we look first on the vnode_free_list. If it is empty, 392 * we next consider vnodes with referencing buffers on the 393 * vnode_hold_list. The toggle ensures that half the time we 394 * will use a buffer from the vnode_hold_list, and half the time 395 * we will allocate a new one unless the list has grown to twice 396 * the desired size. We are reticent to recycle vnodes from the 397 * vnode_hold_list because we will lose the identity of all its 398 * referencing buffers. 399 */ 400 toggle ^= 1; 401 if (numvnodes / 2 > maxvnodes) 402 toggle = 0; 403 404 s = splbio(); 405 if ((numvnodes < maxvnodes) || 406 ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) && 407 ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) { 408 splx(s); 409 vp = pool_get(&vnode_pool, PR_WAITOK | PR_ZERO); 410 vp->v_uvm = pool_get(&uvm_vnode_pool, PR_WAITOK | PR_ZERO); 411 vp->v_uvm->u_vnode = vp; 412 uvm_obj_init(&vp->v_uvm->u_obj, &uvm_vnodeops, 0); 413 RBT_INIT(buf_rb_bufs, &vp->v_bufs_tree); 414 cache_tree_init(&vp->v_nc_tree); 415 TAILQ_INIT(&vp->v_cache_dst); 416 numvnodes++; 417 } else { 418 TAILQ_FOREACH(vp, listhd, v_freelist) { 419 if (VOP_ISLOCKED(vp) == 0) 420 break; 421 } 422 /* 423 * Unless this is a bad time of the month, at most 424 * the first NCPUS items on the free list are 425 * locked, so this is close enough to being empty. 426 */ 427 if (vp == NULL) { 428 splx(s); 429 tablefull("vnode"); 430 *vpp = NULL; 431 return (ENFILE); 432 } 433 434 #ifdef DIAGNOSTIC 435 if (vp->v_usecount) { 436 vprint("free vnode", vp); 437 panic("free vnode isn't"); 438 } 439 #endif 440 441 TAILQ_REMOVE(listhd, vp, v_freelist); 442 vp->v_bioflag &= ~VBIOONFREELIST; 443 splx(s); 444 445 if (vp->v_type != VBAD) 446 vgonel(vp, p); 447 #ifdef DIAGNOSTIC 448 if (vp->v_data) { 449 vprint("cleaned vnode", vp); 450 panic("cleaned vnode isn't"); 451 } 452 s = splbio(); 453 if (vp->v_numoutput) 454 panic("Clean vnode has pending I/O's"); 455 splx(s); 456 #endif 457 vp->v_flag = 0; 458 vp->v_socket = NULL; 459 } 460 cache_purge(vp); 461 vp->v_type = VNON; 462 vp->v_tag = tag; 463 vp->v_op = vops; 464 insmntque(vp, mp); 465 *vpp = vp; 466 vp->v_usecount = 1; 467 vp->v_data = NULL; 468 return (0); 469 } 470 471 /* 472 * Move a vnode from one mount queue to another. 473 */ 474 void 475 insmntque(struct vnode *vp, struct mount *mp) 476 { 477 /* 478 * Delete from old mount point vnode list, if on one. 479 */ 480 if (vp->v_mount != NULL) 481 TAILQ_REMOVE(&vp->v_mount->mnt_vnodelist, vp, v_mntvnodes); 482 /* 483 * Insert into list of vnodes for the new mount point, if available. 484 */ 485 if ((vp->v_mount = mp) != NULL) 486 TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes); 487 } 488 489 /* 490 * Create a vnode for a block device. 491 * Used for root filesystem, argdev, and swap areas. 492 * Also used for memory file system special devices. 493 */ 494 int 495 bdevvp(dev_t dev, struct vnode **vpp) 496 { 497 return (getdevvp(dev, vpp, VBLK)); 498 } 499 500 /* 501 * Create a vnode for a character device. 502 * Used for console handling. 503 */ 504 int 505 cdevvp(dev_t dev, struct vnode **vpp) 506 { 507 return (getdevvp(dev, vpp, VCHR)); 508 } 509 510 /* 511 * Create a vnode for a device. 512 * Used by bdevvp (block device) for root file system etc., 513 * and by cdevvp (character device) for console. 514 */ 515 int 516 getdevvp(dev_t dev, struct vnode **vpp, enum vtype type) 517 { 518 struct vnode *vp; 519 struct vnode *nvp; 520 int error; 521 522 if (dev == NODEV) { 523 *vpp = NULLVP; 524 return (0); 525 } 526 error = getnewvnode(VT_NON, NULL, &spec_vops, &nvp); 527 if (error) { 528 *vpp = NULLVP; 529 return (error); 530 } 531 vp = nvp; 532 vp->v_type = type; 533 if ((nvp = checkalias(vp, dev, NULL)) != NULL) { 534 vput(vp); 535 vp = nvp; 536 } 537 if (vp->v_type == VCHR && cdevsw[major(vp->v_rdev)].d_type == D_TTY) 538 vp->v_flag |= VISTTY; 539 *vpp = vp; 540 return (0); 541 } 542 543 /* 544 * Check to see if the new vnode represents a special device 545 * for which we already have a vnode (either because of 546 * bdevvp() or because of a different vnode representing 547 * the same block device). If such an alias exists, deallocate 548 * the existing contents and return the aliased vnode. The 549 * caller is responsible for filling it with its new contents. 550 */ 551 struct vnode * 552 checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp) 553 { 554 struct proc *p = curproc; 555 struct vnode *vp; 556 struct vnodechain *vchain; 557 558 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 559 return (NULLVP); 560 561 vchain = &speclisth[SPECHASH(nvp_rdev)]; 562 loop: 563 SLIST_FOREACH(vp, vchain, v_specnext) { 564 if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) { 565 continue; 566 } 567 /* 568 * Alias, but not in use, so flush it out. 569 */ 570 if (vp->v_usecount == 0) { 571 vgonel(vp, p); 572 goto loop; 573 } 574 if (vget(vp, LK_EXCLUSIVE)) { 575 goto loop; 576 } 577 break; 578 } 579 580 /* 581 * Common case is actually in the if statement 582 */ 583 if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) { 584 nvp->v_specinfo = malloc(sizeof(struct specinfo), M_VNODE, 585 M_WAITOK); 586 nvp->v_rdev = nvp_rdev; 587 nvp->v_hashchain = vchain; 588 nvp->v_specmountpoint = NULL; 589 nvp->v_speclockf = NULL; 590 nvp->v_specbitmap = NULL; 591 if (nvp->v_type == VCHR && 592 (cdevsw[major(nvp_rdev)].d_flags & D_CLONE) && 593 (minor(nvp_rdev) >> CLONE_SHIFT == 0)) { 594 if (vp != NULLVP) 595 nvp->v_specbitmap = vp->v_specbitmap; 596 else 597 nvp->v_specbitmap = malloc(CLONE_MAPSZ, 598 M_VNODE, M_WAITOK | M_ZERO); 599 } 600 SLIST_INSERT_HEAD(vchain, nvp, v_specnext); 601 if (vp != NULLVP) { 602 nvp->v_flag |= VALIASED; 603 vp->v_flag |= VALIASED; 604 vput(vp); 605 } 606 return (NULLVP); 607 } 608 609 /* 610 * This code is the uncommon case. It is called in case 611 * we found an alias that was VT_NON && vtype of VBLK 612 * This means we found a block device that was created 613 * using bdevvp. 614 * An example of such a vnode is the root partition device vnode 615 * created in ffs_mountroot. 616 * 617 * The vnodes created by bdevvp should not be aliased (why?). 618 */ 619 620 VOP_UNLOCK(vp); 621 vclean(vp, 0, p); 622 vp->v_op = nvp->v_op; 623 vp->v_tag = nvp->v_tag; 624 nvp->v_type = VNON; 625 insmntque(vp, mp); 626 return (vp); 627 } 628 629 /* 630 * Indicate that this vnode will be recycled by the caller and prevent any other 631 * access to the vnode via vget() until it is cleaned. Callers must ensure 632 * vclean() is called on this vnode. vclean() will permit the vnode to be passed 633 * in with the VXLOCK flag set if VDOOMED is set. 634 */ 635 void 636 vdoom(struct vnode *vp) 637 { 638 mtx_enter(&vnode_mtx); 639 KASSERT(vp->v_usecount == 0); 640 if (vp->v_lflag & VXLOCK) 641 panic("vdoom: vnode already locked!"); 642 vp->v_lflag |= VXLOCK; 643 if (vp->v_lflag & VDOOMED) 644 panic("vdoom: vnode already doomed!"); 645 vp->v_lflag |= VDOOMED; 646 mtx_leave(&vnode_mtx); 647 } 648 649 /* 650 * Grab a particular vnode from the free list, increment its 651 * reference count and lock it. If the vnode lock bit is set, 652 * the vnode is being eliminated in vgone. In that case, we 653 * cannot grab it, so the process is awakened when the 654 * transition is completed, and an error code is returned to 655 * indicate that the vnode is no longer usable, possibly 656 * having been changed to a new file system type. 657 */ 658 int 659 vget(struct vnode *vp, int flags) 660 { 661 int error, s, onfreelist; 662 663 /* 664 * If the vnode is in the process of being cleaned out for 665 * another use, we wait for the cleaning to finish and then 666 * return failure. Cleaning is determined by checking that 667 * the VXLOCK flag is set. 668 */ 669 mtx_enter(&vnode_mtx); 670 if (vp->v_lflag & VXLOCK) { 671 if (flags & LK_NOWAIT) { 672 mtx_leave(&vnode_mtx); 673 return (EBUSY); 674 } 675 676 vp->v_lflag |= VXWANT; 677 msleep_nsec(vp, &vnode_mtx, PINOD, "vget", INFSLP); 678 mtx_leave(&vnode_mtx); 679 return (ENOENT); 680 } 681 mtx_leave(&vnode_mtx); 682 683 s = splbio(); 684 onfreelist = vp->v_bioflag & VBIOONFREELIST; 685 if (vp->v_usecount == 0 && onfreelist) { 686 if (vp->v_holdcnt > 0) 687 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 688 else 689 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 690 vp->v_bioflag &= ~VBIOONFREELIST; 691 } 692 splx(s); 693 694 vp->v_usecount++; 695 if (flags & LK_TYPE_MASK) { 696 if ((error = vn_lock(vp, flags)) != 0) { 697 vp->v_usecount--; 698 if (vp->v_usecount == 0 && onfreelist) 699 vputonfreelist(vp); 700 } 701 return (error); 702 } 703 704 return (0); 705 } 706 707 708 /* Vnode reference. */ 709 void 710 vref(struct vnode *vp) 711 { 712 KERNEL_ASSERT_LOCKED(); 713 714 #ifdef DIAGNOSTIC 715 if (vp->v_usecount == 0) 716 panic("vref used where vget required"); 717 if (vp->v_type == VNON) 718 panic("vref on a VNON vnode"); 719 #endif 720 vp->v_usecount++; 721 } 722 723 void 724 vputonfreelist(struct vnode *vp) 725 { 726 int s; 727 struct freelst *lst; 728 729 s = splbio(); 730 #ifdef DIAGNOSTIC 731 if (vp->v_usecount != 0) 732 panic("Use count is not zero!"); 733 734 /* 735 * If the hold count is still positive, one or many threads could still 736 * be waiting on the vnode lock inside uvn_io(). 737 */ 738 if (vp->v_holdcnt == 0 && vp->v_lockcount != 0) 739 panic("%s: lock count is not zero", __func__); 740 741 if (vp->v_bioflag & VBIOONFREELIST) { 742 vprint("vnode already on free list: ", vp); 743 panic("vnode already on free list"); 744 } 745 #endif 746 747 vp->v_bioflag |= VBIOONFREELIST; 748 vp->v_bioflag &= ~VBIOERROR; 749 750 if (vp->v_holdcnt > 0) 751 lst = &vnode_hold_list; 752 else 753 lst = &vnode_free_list; 754 755 if (vp->v_type == VBAD) 756 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 757 else 758 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 759 760 splx(s); 761 } 762 763 /* 764 * vput(), just unlock and vrele() 765 */ 766 void 767 vput(struct vnode *vp) 768 { 769 struct proc *p = curproc; 770 int s; 771 772 #ifdef DIAGNOSTIC 773 if (vp == NULL) 774 panic("vput: null vp"); 775 #endif 776 777 #ifdef DIAGNOSTIC 778 if (vp->v_usecount == 0) { 779 vprint("vput: bad ref count", vp); 780 panic("vput: ref cnt"); 781 } 782 #endif 783 vp->v_usecount--; 784 KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); 785 if (vp->v_usecount > 0) { 786 VOP_UNLOCK(vp); 787 return; 788 } 789 790 #ifdef DIAGNOSTIC 791 if (vp->v_writecount != 0) { 792 vprint("vput: bad writecount", vp); 793 panic("vput: v_writecount != 0"); 794 } 795 #endif 796 797 VOP_INACTIVE(vp, p); 798 799 s = splbio(); 800 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 801 vputonfreelist(vp); 802 splx(s); 803 } 804 805 /* 806 * Vnode release - use for active VNODES. 807 * If count drops to zero, call inactive routine and return to freelist. 808 * Returns 0 if it did not sleep. 809 */ 810 int 811 vrele(struct vnode *vp) 812 { 813 struct proc *p = curproc; 814 int s; 815 816 #ifdef DIAGNOSTIC 817 if (vp == NULL) 818 panic("vrele: null vp"); 819 #endif 820 #ifdef DIAGNOSTIC 821 if (vp->v_usecount == 0) { 822 vprint("vrele: bad ref count", vp); 823 panic("vrele: ref cnt"); 824 } 825 #endif 826 vp->v_usecount--; 827 if (vp->v_usecount > 0) { 828 return (0); 829 } 830 831 #ifdef DIAGNOSTIC 832 if (vp->v_writecount != 0) { 833 vprint("vrele: bad writecount", vp); 834 panic("vrele: v_writecount != 0"); 835 } 836 #endif 837 838 if (vn_lock(vp, LK_EXCLUSIVE)) { 839 #ifdef DIAGNOSTIC 840 vprint("vrele: cannot lock", vp); 841 #endif 842 return (1); 843 } 844 845 VOP_INACTIVE(vp, p); 846 847 s = splbio(); 848 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 849 vputonfreelist(vp); 850 splx(s); 851 return (1); 852 } 853 854 /* Page or buffer structure gets a reference. */ 855 void 856 vhold(struct vnode *vp) 857 { 858 int s; 859 860 s = splbio(); 861 862 /* 863 * If it is on the freelist and the hold count is currently 864 * zero, move it to the hold list. 865 */ 866 if ((vp->v_bioflag & VBIOONFREELIST) && 867 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 868 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 869 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 870 } 871 vp->v_holdcnt++; 872 873 splx(s); 874 } 875 876 /* Lose interest in a vnode. */ 877 void 878 vdrop(struct vnode *vp) 879 { 880 int s; 881 882 s = splbio(); 883 884 #ifdef DIAGNOSTIC 885 if (vp->v_holdcnt == 0) 886 panic("vdrop: zero holdcnt"); 887 #endif 888 889 vp->v_holdcnt--; 890 891 /* 892 * If it is on the holdlist and the hold count drops to 893 * zero, move it to the free list. 894 */ 895 if ((vp->v_bioflag & VBIOONFREELIST) && 896 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 897 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 898 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 899 } 900 901 splx(s); 902 } 903 904 /* 905 * Remove any vnodes in the vnode table belonging to mount point mp. 906 * 907 * If MNT_NOFORCE is specified, there should not be any active ones, 908 * return error if any are found (nb: this is a user error, not a 909 * system error). If MNT_FORCE is specified, detach any active vnodes 910 * that are found. 911 */ 912 #ifdef DEBUG_SYSCTL 913 int busyprt = 0; /* print out busy vnodes */ 914 struct ctldebug debug_vfs_busyprt = { "vfs_busyprt", &busyprt }; 915 #endif 916 917 int 918 vfs_mount_foreach_vnode(struct mount *mp, 919 int (*func)(struct vnode *, void *), void *arg) { 920 struct vnode *vp, *nvp; 921 int error = 0; 922 923 loop: 924 TAILQ_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 925 if (vp->v_mount != mp) 926 goto loop; 927 928 error = func(vp, arg); 929 930 if (error != 0) 931 break; 932 } 933 934 return (error); 935 } 936 937 struct vflush_args { 938 struct vnode *skipvp; 939 int busy; 940 int flags; 941 }; 942 943 int 944 vflush_vnode(struct vnode *vp, void *arg) 945 { 946 struct vflush_args *va = arg; 947 struct proc *p = curproc; 948 int empty, s; 949 950 if (vp == va->skipvp) { 951 return (0); 952 } 953 954 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 955 return (0); 956 } 957 958 /* 959 * If WRITECLOSE is set, only flush out regular file 960 * vnodes open for writing. 961 */ 962 if ((va->flags & WRITECLOSE) && 963 (vp->v_writecount == 0 || vp->v_type != VREG)) { 964 return (0); 965 } 966 967 /* 968 * With v_usecount == 0, all we need to do is clear 969 * out the vnode data structures and we are done. 970 */ 971 if (vp->v_usecount == 0) { 972 vgonel(vp, p); 973 return (0); 974 } 975 976 /* 977 * If FORCECLOSE is set, forcibly close the vnode. 978 * For block or character devices, revert to an 979 * anonymous device. For all other files, just kill them. 980 */ 981 if (va->flags & FORCECLOSE) { 982 if (vp->v_type != VBLK && vp->v_type != VCHR) { 983 vgonel(vp, p); 984 } else { 985 vclean(vp, 0, p); 986 vp->v_op = &spec_vops; 987 insmntque(vp, NULL); 988 } 989 return (0); 990 } 991 992 /* 993 * If set, this is allowed to ignore vnodes which don't 994 * have changes pending to disk. 995 * XXX Might be nice to check per-fs "inode" flags, but 996 * generally the filesystem is sync'd already, right? 997 */ 998 s = splbio(); 999 empty = (va->flags & IGNORECLEAN) && LIST_EMPTY(&vp->v_dirtyblkhd); 1000 splx(s); 1001 1002 if (empty) 1003 return (0); 1004 1005 #ifdef DEBUG_SYSCTL 1006 if (busyprt) 1007 vprint("vflush: busy vnode", vp); 1008 #endif 1009 va->busy++; 1010 return (0); 1011 } 1012 1013 int 1014 vflush(struct mount *mp, struct vnode *skipvp, int flags) 1015 { 1016 struct vflush_args va; 1017 va.skipvp = skipvp; 1018 va.busy = 0; 1019 va.flags = flags; 1020 1021 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 1022 1023 if (va.busy) 1024 return (EBUSY); 1025 return (0); 1026 } 1027 1028 /* 1029 * Disassociate the underlying file system from a vnode. 1030 */ 1031 void 1032 vclean(struct vnode *vp, int flags, struct proc *p) 1033 { 1034 int active, do_wakeup = 0; 1035 int s; 1036 1037 /* 1038 * Check to see if the vnode is in use. 1039 * If so we have to reference it before we clean it out 1040 * so that its count cannot fall to zero and generate a 1041 * race against ourselves to recycle it. 1042 */ 1043 if ((active = vp->v_usecount) != 0) 1044 vp->v_usecount++; 1045 1046 /* 1047 * Prevent the vnode from being recycled or 1048 * brought into use while we clean it out. 1049 */ 1050 mtx_enter(&vnode_mtx); 1051 if (vp->v_lflag & VXLOCK) 1052 if (!(vp->v_lflag & VDOOMED)) 1053 panic("vclean: deadlock"); 1054 vp->v_lflag |= VXLOCK; 1055 vp->v_lflag &= ~VDOOMED; 1056 1057 if (vp->v_lockcount > 0) { 1058 /* 1059 * Ensure that any thread currently waiting on the same lock has 1060 * observed that the vnode is about to be exclusively locked 1061 * before continuing. 1062 */ 1063 msleep_nsec(&vp->v_lockcount, &vnode_mtx, PINOD, "vop_lock", 1064 INFSLP); 1065 KASSERT(vp->v_lockcount == 0); 1066 } 1067 mtx_leave(&vnode_mtx); 1068 1069 /* 1070 * Even if the count is zero, the VOP_INACTIVE routine may still 1071 * have the object locked while it cleans it out. The VOP_LOCK 1072 * ensures that the VOP_INACTIVE routine is done with its work. 1073 * For active vnodes, it ensures that no other activity can 1074 * occur while the underlying object is being cleaned out. 1075 */ 1076 VOP_LOCK(vp, LK_EXCLUSIVE | LK_DRAIN); 1077 1078 /* 1079 * Clean out any VM data associated with the vnode. 1080 */ 1081 uvm_vnp_terminate(vp); 1082 /* 1083 * Clean out any buffers associated with the vnode. 1084 */ 1085 if (flags & DOCLOSE) 1086 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, INFSLP); 1087 /* 1088 * If purging an active vnode, it must be closed and 1089 * deactivated before being reclaimed. Note that the 1090 * VOP_INACTIVE will unlock the vnode 1091 */ 1092 if (active) { 1093 if (flags & DOCLOSE) 1094 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1095 VOP_INACTIVE(vp, p); 1096 } else { 1097 /* 1098 * Any other processes trying to obtain this lock must first 1099 * wait for VXLOCK to clear, then call the new lock operation. 1100 */ 1101 VOP_UNLOCK(vp); 1102 } 1103 1104 /* 1105 * Reclaim the vnode. 1106 */ 1107 if (VOP_RECLAIM(vp, p)) 1108 panic("vclean: cannot reclaim"); 1109 if (active) { 1110 vp->v_usecount--; 1111 if (vp->v_usecount == 0) { 1112 s = splbio(); 1113 if (vp->v_holdcnt > 0) 1114 panic("vclean: not clean"); 1115 vputonfreelist(vp); 1116 splx(s); 1117 } 1118 } 1119 cache_purge(vp); 1120 1121 /* 1122 * Done with purge, notify sleepers of the grim news. 1123 */ 1124 vp->v_op = &dead_vops; 1125 VN_KNOTE(vp, NOTE_REVOKE); 1126 vp->v_tag = VT_NON; 1127 #ifdef VFSLCKDEBUG 1128 vp->v_flag &= ~VLOCKSWORK; 1129 #endif 1130 mtx_enter(&vnode_mtx); 1131 vp->v_lflag &= ~VXLOCK; 1132 if (vp->v_lflag & VXWANT) { 1133 vp->v_lflag &= ~VXWANT; 1134 do_wakeup = 1; 1135 } 1136 mtx_leave(&vnode_mtx); 1137 if (do_wakeup) 1138 wakeup(vp); 1139 } 1140 1141 /* 1142 * Recycle an unused vnode to the front of the free list. 1143 */ 1144 int 1145 vrecycle(struct vnode *vp, struct proc *p) 1146 { 1147 if (vp->v_usecount == 0) { 1148 vgonel(vp, p); 1149 return (1); 1150 } 1151 return (0); 1152 } 1153 1154 /* 1155 * Eliminate all activity associated with a vnode 1156 * in preparation for reuse. 1157 */ 1158 void 1159 vgone(struct vnode *vp) 1160 { 1161 struct proc *p = curproc; 1162 vgonel(vp, p); 1163 } 1164 1165 /* 1166 * vgone, with struct proc. 1167 */ 1168 void 1169 vgonel(struct vnode *vp, struct proc *p) 1170 { 1171 struct vnode *vq; 1172 struct vnode *vx; 1173 int s; 1174 1175 KASSERT(vp->v_uvcount == 0); 1176 1177 /* 1178 * If a vgone (or vclean) is already in progress, 1179 * wait until it is done and return. 1180 */ 1181 mtx_enter(&vnode_mtx); 1182 if (!(vp->v_lflag & VDOOMED) && vp->v_flag & VXLOCK) { 1183 vp->v_lflag |= VXWANT; 1184 msleep_nsec(vp, &vnode_mtx, PINOD, "vgone", INFSLP); 1185 mtx_leave(&vnode_mtx); 1186 return; 1187 } 1188 mtx_leave(&vnode_mtx); 1189 1190 /* 1191 * Clean out the filesystem specific data. 1192 */ 1193 vclean(vp, DOCLOSE, p); 1194 /* 1195 * Delete from old mount point vnode list, if on one. 1196 */ 1197 if (vp->v_mount != NULL) 1198 insmntque(vp, NULL); 1199 /* 1200 * If special device, remove it from special device alias list 1201 * if it is on one. 1202 */ 1203 if ((vp->v_type == VBLK || vp->v_type == VCHR) && 1204 vp->v_specinfo != NULL) { 1205 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1206 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1207 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1208 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1209 } 1210 SLIST_REMOVE(vp->v_hashchain, vp, vnode, v_specnext); 1211 if (vp->v_flag & VALIASED) { 1212 vx = NULL; 1213 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1214 if (vq->v_rdev != vp->v_rdev || 1215 vq->v_type != vp->v_type) 1216 continue; 1217 if (vx) 1218 break; 1219 vx = vq; 1220 } 1221 if (vx == NULL) 1222 panic("missing alias"); 1223 if (vq == NULL) 1224 vx->v_flag &= ~VALIASED; 1225 vp->v_flag &= ~VALIASED; 1226 } 1227 lf_purgelocks(&vp->v_speclockf); 1228 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1229 vp->v_specinfo = NULL; 1230 } 1231 /* 1232 * If it is on the freelist and not already at the head, 1233 * move it to the head of the list. 1234 */ 1235 vp->v_type = VBAD; 1236 1237 /* 1238 * Move onto the free list, unless we were called from 1239 * getnewvnode and we're not on any free list 1240 */ 1241 s = splbio(); 1242 if (vp->v_usecount == 0 && 1243 (vp->v_bioflag & VBIOONFREELIST)) { 1244 if (vp->v_holdcnt > 0) 1245 panic("vgonel: not clean"); 1246 1247 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1248 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1249 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1250 } 1251 } 1252 splx(s); 1253 } 1254 1255 /* 1256 * Lookup a vnode by device number. 1257 */ 1258 int 1259 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1260 { 1261 struct vnode *vp; 1262 int rc =0; 1263 1264 SLIST_FOREACH(vp, &speclisth[SPECHASH(dev)], v_specnext) { 1265 if (dev != vp->v_rdev || type != vp->v_type) 1266 continue; 1267 *vpp = vp; 1268 rc = 1; 1269 break; 1270 } 1271 return (rc); 1272 } 1273 1274 /* 1275 * Revoke all the vnodes corresponding to the specified minor number 1276 * range (endpoints inclusive) of the specified major. 1277 */ 1278 void 1279 vdevgone(int maj, int minl, int minh, enum vtype type) 1280 { 1281 struct vnode *vp; 1282 int mn; 1283 1284 for (mn = minl; mn <= minh; mn++) 1285 if (vfinddev(makedev(maj, mn), type, &vp)) 1286 VOP_REVOKE(vp, REVOKEALL); 1287 } 1288 1289 /* 1290 * Calculate the total number of references to a special device. 1291 */ 1292 int 1293 vcount(struct vnode *vp) 1294 { 1295 struct vnode *vq; 1296 int count; 1297 1298 loop: 1299 if ((vp->v_flag & VALIASED) == 0) 1300 return (vp->v_usecount); 1301 count = 0; 1302 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1303 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1304 continue; 1305 /* 1306 * Alias, but not in use, so flush it out. 1307 */ 1308 if (vq->v_usecount == 0 && vq != vp) { 1309 vgone(vq); 1310 goto loop; 1311 } 1312 count += vq->v_usecount; 1313 } 1314 return (count); 1315 } 1316 1317 #if defined(DEBUG) || defined(DIAGNOSTIC) 1318 /* 1319 * Print out a description of a vnode. 1320 */ 1321 static char *typename[] = 1322 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1323 1324 void 1325 vprint(char *label, struct vnode *vp) 1326 { 1327 char buf[64]; 1328 1329 if (label != NULL) 1330 printf("%s: ", label); 1331 printf("%p, type %s, use %u, write %u, hold %u,", 1332 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1333 vp->v_holdcnt); 1334 buf[0] = '\0'; 1335 if (vp->v_flag & VROOT) 1336 strlcat(buf, "|VROOT", sizeof buf); 1337 if (vp->v_flag & VTEXT) 1338 strlcat(buf, "|VTEXT", sizeof buf); 1339 if (vp->v_flag & VSYSTEM) 1340 strlcat(buf, "|VSYSTEM", sizeof buf); 1341 if (vp->v_lflag & VXLOCK) 1342 strlcat(buf, "|VXLOCK", sizeof buf); 1343 if (vp->v_lflag & VXWANT) 1344 strlcat(buf, "|VXWANT", sizeof buf); 1345 if (vp->v_bioflag & VBIOWAIT) 1346 strlcat(buf, "|VBIOWAIT", sizeof buf); 1347 if (vp->v_bioflag & VBIOONFREELIST) 1348 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1349 if (vp->v_bioflag & VBIOONSYNCLIST) 1350 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1351 if (vp->v_flag & VALIASED) 1352 strlcat(buf, "|VALIASED", sizeof buf); 1353 if (vp->v_flag & VDOOMED) 1354 strlcat(buf, "|VDOOMED", sizeof buf); 1355 if (buf[0] != '\0') 1356 printf(" flags (%s)", &buf[1]); 1357 if (vp->v_data == NULL) { 1358 printf("\n"); 1359 } else { 1360 printf("\n\t"); 1361 VOP_PRINT(vp); 1362 } 1363 } 1364 #endif /* DEBUG || DIAGNOSTIC */ 1365 1366 #ifdef DEBUG 1367 /* 1368 * List all of the locked vnodes in the system. 1369 * Called when debugging the kernel. 1370 */ 1371 void 1372 printlockedvnodes(void) 1373 { 1374 struct mount *mp; 1375 struct vnode *vp; 1376 1377 printf("Locked vnodes\n"); 1378 1379 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1380 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1381 continue; 1382 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1383 if (VOP_ISLOCKED(vp)) 1384 vprint(NULL, vp); 1385 } 1386 vfs_unbusy(mp); 1387 } 1388 1389 } 1390 #endif 1391 1392 /* 1393 * Top level filesystem related information gathering. 1394 */ 1395 int 1396 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1397 size_t newlen, struct proc *p) 1398 { 1399 struct vfsconf *vfsp, *tmpvfsp; 1400 int ret; 1401 1402 /* all sysctl names at this level are at least name and field */ 1403 if (namelen < 2) 1404 return (ENOTDIR); /* overloaded */ 1405 1406 if (name[0] != VFS_GENERIC) { 1407 vfsp = vfs_bytypenum(name[0]); 1408 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1409 return (EOPNOTSUPP); 1410 1411 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1412 oldp, oldlenp, newp, newlen, p)); 1413 } 1414 1415 switch (name[1]) { 1416 case VFS_MAXTYPENUM: 1417 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1418 1419 case VFS_CONF: 1420 if (namelen < 3) 1421 return (ENOTDIR); /* overloaded */ 1422 1423 vfsp = vfs_bytypenum(name[2]); 1424 if (vfsp == NULL) 1425 return (EOPNOTSUPP); 1426 1427 /* Make a copy, clear out kernel pointers */ 1428 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1429 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1430 tmpvfsp->vfc_vfsops = NULL; 1431 1432 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1433 sizeof(struct vfsconf)); 1434 1435 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1436 return (ret); 1437 case VFS_BCACHESTAT: /* buffer cache statistics */ 1438 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1439 sizeof(struct bcachestats)); 1440 return(ret); 1441 } 1442 return (EOPNOTSUPP); 1443 } 1444 1445 /* 1446 * Check to see if a filesystem is mounted on a block device. 1447 */ 1448 int 1449 vfs_mountedon(struct vnode *vp) 1450 { 1451 struct vnode *vq; 1452 int error = 0; 1453 1454 if (vp->v_specmountpoint != NULL) 1455 return (EBUSY); 1456 if (vp->v_flag & VALIASED) { 1457 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1458 if (vq->v_rdev != vp->v_rdev || 1459 vq->v_type != vp->v_type) 1460 continue; 1461 if (vq->v_specmountpoint != NULL) { 1462 error = EBUSY; 1463 break; 1464 } 1465 } 1466 } 1467 return (error); 1468 } 1469 1470 #ifdef NFSSERVER 1471 /* 1472 * Build hash lists of net addresses and hang them off the mount point. 1473 * Called by vfs_export() to set up the lists of export addresses. 1474 */ 1475 int 1476 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1477 struct export_args *argp) 1478 { 1479 struct netcred *np; 1480 struct radix_node_head *rnh; 1481 int nplen, i; 1482 struct radix_node *rn; 1483 struct sockaddr *saddr, *smask = NULL; 1484 int error; 1485 1486 if (argp->ex_addrlen == 0) { 1487 if (mp->mnt_flag & MNT_DEFEXPORTED) 1488 return (EPERM); 1489 np = &nep->ne_defexported; 1490 /* fill in the kernel's ucred from userspace's xucred */ 1491 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1492 return (error); 1493 mp->mnt_flag |= MNT_DEFEXPORTED; 1494 goto finish; 1495 } 1496 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1497 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1498 return (EINVAL); 1499 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1500 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1501 np->netc_len = nplen; 1502 saddr = (struct sockaddr *)(np + 1); 1503 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1504 if (error) 1505 goto out; 1506 if (saddr->sa_len > argp->ex_addrlen) 1507 saddr->sa_len = argp->ex_addrlen; 1508 if (argp->ex_masklen) { 1509 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1510 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1511 if (error) 1512 goto out; 1513 if (smask->sa_len > argp->ex_masklen) 1514 smask->sa_len = argp->ex_masklen; 1515 } 1516 /* fill in the kernel's ucred from userspace's xucred */ 1517 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1518 goto out; 1519 i = saddr->sa_family; 1520 switch (i) { 1521 case AF_INET: 1522 if ((rnh = nep->ne_rtable_inet) == NULL) { 1523 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1524 offsetof(struct sockaddr_in, sin_addr))) { 1525 error = ENOBUFS; 1526 goto out; 1527 } 1528 rnh = nep->ne_rtable_inet; 1529 } 1530 break; 1531 default: 1532 error = EINVAL; 1533 goto out; 1534 } 1535 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1536 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 1537 error = EPERM; 1538 goto out; 1539 } 1540 finish: 1541 np->netc_exflags = argp->ex_flags; 1542 return (0); 1543 out: 1544 free(np, M_NETADDR, np->netc_len); 1545 return (error); 1546 } 1547 1548 int 1549 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1550 { 1551 struct radix_node_head *rnh = (struct radix_node_head *)w; 1552 struct netcred * np = (struct netcred *)rn; 1553 1554 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1555 free(np, M_NETADDR, np->netc_len); 1556 return (0); 1557 } 1558 1559 /* 1560 * Free the net address hash lists that are hanging off the mount points. 1561 */ 1562 void 1563 vfs_free_addrlist(struct netexport *nep) 1564 { 1565 struct radix_node_head *rnh; 1566 1567 if ((rnh = nep->ne_rtable_inet) != NULL) { 1568 rn_walktree(rnh, vfs_free_netcred, rnh); 1569 free(rnh, M_RTABLE, sizeof(*rnh)); 1570 nep->ne_rtable_inet = NULL; 1571 } 1572 } 1573 #endif /* NFSSERVER */ 1574 1575 int 1576 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1577 { 1578 #ifdef NFSSERVER 1579 int error; 1580 1581 if (argp->ex_flags & MNT_DELEXPORT) { 1582 vfs_free_addrlist(nep); 1583 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1584 } 1585 if (argp->ex_flags & MNT_EXPORTED) { 1586 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1587 return (error); 1588 mp->mnt_flag |= MNT_EXPORTED; 1589 } 1590 return (0); 1591 #else 1592 return (ENOTSUP); 1593 #endif /* NFSSERVER */ 1594 } 1595 1596 struct netcred * 1597 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1598 { 1599 #ifdef NFSSERVER 1600 struct netcred *np; 1601 struct radix_node_head *rnh; 1602 struct sockaddr *saddr; 1603 1604 np = NULL; 1605 if (mp->mnt_flag & MNT_EXPORTED) { 1606 /* 1607 * Lookup in the export list first. 1608 */ 1609 if (nam != NULL) { 1610 saddr = mtod(nam, struct sockaddr *); 1611 switch(saddr->sa_family) { 1612 case AF_INET: 1613 rnh = nep->ne_rtable_inet; 1614 break; 1615 default: 1616 rnh = NULL; 1617 break; 1618 } 1619 if (rnh != NULL) 1620 np = (struct netcred *)rn_match(saddr, rnh); 1621 } 1622 /* 1623 * If no address match, use the default if it exists. 1624 */ 1625 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1626 np = &nep->ne_defexported; 1627 } 1628 return (np); 1629 #else 1630 return (NULL); 1631 #endif /* NFSSERVER */ 1632 } 1633 1634 /* 1635 * Do the usual access checking. 1636 * file_mode, uid and gid are from the vnode in question, 1637 * while acc_mode and cred are from the VOP_ACCESS parameter list 1638 */ 1639 int 1640 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1641 mode_t acc_mode, struct ucred *cred) 1642 { 1643 mode_t mask; 1644 1645 /* User id 0 always gets read/write access. */ 1646 if (cred->cr_uid == 0) { 1647 /* For VEXEC, at least one of the execute bits must be set. */ 1648 if ((acc_mode & VEXEC) && type != VDIR && 1649 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1650 return EACCES; 1651 return 0; 1652 } 1653 1654 mask = 0; 1655 1656 /* Otherwise, check the owner. */ 1657 if (cred->cr_uid == uid) { 1658 if (acc_mode & VEXEC) 1659 mask |= S_IXUSR; 1660 if (acc_mode & VREAD) 1661 mask |= S_IRUSR; 1662 if (acc_mode & VWRITE) 1663 mask |= S_IWUSR; 1664 return (file_mode & mask) == mask ? 0 : EACCES; 1665 } 1666 1667 /* Otherwise, check the groups. */ 1668 if (groupmember(gid, cred)) { 1669 if (acc_mode & VEXEC) 1670 mask |= S_IXGRP; 1671 if (acc_mode & VREAD) 1672 mask |= S_IRGRP; 1673 if (acc_mode & VWRITE) 1674 mask |= S_IWGRP; 1675 return (file_mode & mask) == mask ? 0 : EACCES; 1676 } 1677 1678 /* Otherwise, check everyone else. */ 1679 if (acc_mode & VEXEC) 1680 mask |= S_IXOTH; 1681 if (acc_mode & VREAD) 1682 mask |= S_IROTH; 1683 if (acc_mode & VWRITE) 1684 mask |= S_IWOTH; 1685 return (file_mode & mask) == mask ? 0 : EACCES; 1686 } 1687 1688 int 1689 vnoperm(struct vnode *vp) 1690 { 1691 if (vp->v_flag & VROOT || vp->v_mount == NULL) 1692 return 0; 1693 1694 return (vp->v_mount->mnt_flag & MNT_NOPERM); 1695 } 1696 1697 struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1698 unsigned int vfs_stalling = 0; 1699 1700 int 1701 vfs_stall(struct proc *p, int stall) 1702 { 1703 struct mount *mp; 1704 int allerror = 0, error; 1705 1706 if (stall) { 1707 atomic_inc_int(&vfs_stalling); 1708 rw_enter_write(&vfs_stall_lock); 1709 } 1710 1711 /* 1712 * The loop variable mp is protected by vfs_busy() so that it cannot 1713 * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the 1714 * lock order consistent with dounmount(). 1715 */ 1716 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1717 if (stall) { 1718 error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); 1719 if (error) { 1720 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1721 allerror = error; 1722 continue; 1723 } 1724 uvm_vnp_sync(mp); 1725 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1726 if (error) { 1727 printf("%s: failed to sync\n", 1728 mp->mnt_stat.f_mntonname); 1729 vfs_unbusy(mp); 1730 allerror = error; 1731 continue; 1732 } 1733 mp->mnt_flag |= MNT_STALLED; 1734 } else { 1735 if (mp->mnt_flag & MNT_STALLED) { 1736 vfs_unbusy(mp); 1737 mp->mnt_flag &= ~MNT_STALLED; 1738 } 1739 } 1740 } 1741 1742 if (!stall) { 1743 rw_exit_write(&vfs_stall_lock); 1744 atomic_dec_int(&vfs_stalling); 1745 } 1746 1747 return (allerror); 1748 } 1749 1750 void 1751 vfs_stall_barrier(void) 1752 { 1753 if (__predict_false(vfs_stalling)) { 1754 rw_enter_read(&vfs_stall_lock); 1755 rw_exit_read(&vfs_stall_lock); 1756 } 1757 } 1758 1759 /* 1760 * Unmount all file systems. 1761 * We traverse the list in reverse order under the assumption that doing so 1762 * will avoid needing to worry about dependencies. 1763 */ 1764 void 1765 vfs_unmountall(void) 1766 { 1767 struct mount *mp, *nmp; 1768 int allerror, error, again = 1; 1769 1770 retry: 1771 allerror = 0; 1772 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1773 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1774 continue; 1775 /* XXX Here is a race, the next pointer is not locked. */ 1776 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1777 printf("unmount of %s failed with error %d\n", 1778 mp->mnt_stat.f_mntonname, error); 1779 allerror = 1; 1780 } 1781 } 1782 1783 if (allerror) { 1784 printf("WARNING: some file systems would not unmount\n"); 1785 if (again) { 1786 printf("retrying\n"); 1787 again = 0; 1788 goto retry; 1789 } 1790 } 1791 } 1792 1793 /* 1794 * Sync and unmount file systems before shutting down. 1795 */ 1796 void 1797 vfs_shutdown(struct proc *p) 1798 { 1799 #ifdef ACCOUNTING 1800 acct_shutdown(); 1801 #endif 1802 1803 printf("syncing disks..."); 1804 1805 if (panicstr == NULL) { 1806 /* Sync before unmount, in case we hang on something. */ 1807 sys_sync(p, NULL, NULL); 1808 vfs_unmountall(); 1809 } 1810 1811 #if NSOFTRAID > 0 1812 sr_quiesce(); 1813 #endif 1814 1815 if (vfs_syncwait(p, 1)) 1816 printf(" giving up\n"); 1817 else 1818 printf(" done\n"); 1819 } 1820 1821 /* 1822 * perform sync() operation and wait for buffers to flush. 1823 */ 1824 int 1825 vfs_syncwait(struct proc *p, int verbose) 1826 { 1827 struct buf *bp; 1828 int iter, nbusy, dcount, s; 1829 #ifdef MULTIPROCESSOR 1830 int hold_count; 1831 #endif 1832 1833 sys_sync(p, NULL, NULL); 1834 1835 /* Wait for sync to finish. */ 1836 dcount = 10000; 1837 for (iter = 0; iter < 20; iter++) { 1838 nbusy = 0; 1839 LIST_FOREACH(bp, &bufhead, b_list) { 1840 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1841 nbusy++; 1842 /* 1843 * With soft updates, some buffers that are 1844 * written will be remarked as dirty until other 1845 * buffers are written. 1846 * 1847 * XXX here be dragons. this should really go away 1848 * but should be carefully made to go away on it's 1849 * own with testing.. XXX 1850 */ 1851 if (bp->b_flags & B_DELWRI) { 1852 s = splbio(); 1853 bremfree(bp); 1854 buf_acquire(bp); 1855 splx(s); 1856 nbusy++; 1857 bawrite(bp); 1858 if (dcount-- <= 0) { 1859 if (verbose) 1860 printf("softdep "); 1861 return 1; 1862 } 1863 } 1864 } 1865 if (nbusy == 0) 1866 break; 1867 if (verbose) 1868 printf("%d ", nbusy); 1869 #ifdef MULTIPROCESSOR 1870 if (_kernel_lock_held()) 1871 hold_count = __mp_release_all(&kernel_lock); 1872 else 1873 hold_count = 0; 1874 #endif 1875 DELAY(40000 * iter); 1876 #ifdef MULTIPROCESSOR 1877 if (hold_count) 1878 __mp_acquire_count(&kernel_lock, hold_count); 1879 #endif 1880 } 1881 1882 return nbusy; 1883 } 1884 1885 /* 1886 * posix file system related system variables. 1887 */ 1888 int 1889 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1890 void *newp, size_t newlen, struct proc *p) 1891 { 1892 /* all sysctl names at this level are terminal */ 1893 if (namelen != 1) 1894 return (ENOTDIR); 1895 1896 switch (name[0]) { 1897 case FS_POSIX_SETUID: 1898 return (sysctl_securelevel_int(oldp, oldlenp, newp, newlen, 1899 &suid_clear)); 1900 default: 1901 return (EOPNOTSUPP); 1902 } 1903 /* NOTREACHED */ 1904 } 1905 1906 /* 1907 * file system related system variables. 1908 */ 1909 int 1910 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1911 size_t newlen, struct proc *p) 1912 { 1913 sysctlfn *fn; 1914 1915 switch (name[0]) { 1916 case FS_POSIX: 1917 fn = fs_posix_sysctl; 1918 break; 1919 default: 1920 return (EOPNOTSUPP); 1921 } 1922 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1923 } 1924 1925 1926 /* 1927 * Routines dealing with vnodes and buffers 1928 */ 1929 1930 /* 1931 * Wait for all outstanding I/Os to complete 1932 * 1933 * Manipulates v_numoutput. Must be called at splbio() 1934 */ 1935 int 1936 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, uint64_t timeo) 1937 { 1938 int error = 0; 1939 1940 splassert(IPL_BIO); 1941 1942 while (vp->v_numoutput) { 1943 vp->v_bioflag |= VBIOWAIT; 1944 error = tsleep_nsec(&vp->v_numoutput, 1945 slpflag | (PRIBIO + 1), wmesg, timeo); 1946 if (error) 1947 break; 1948 } 1949 1950 return (error); 1951 } 1952 1953 /* 1954 * Update outstanding I/O count and do wakeup if requested. 1955 * 1956 * Manipulates v_numoutput. Must be called at splbio() 1957 */ 1958 void 1959 vwakeup(struct vnode *vp) 1960 { 1961 splassert(IPL_BIO); 1962 1963 if (vp != NULL) { 1964 if (vp->v_numoutput-- == 0) 1965 panic("vwakeup: neg numoutput"); 1966 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1967 vp->v_bioflag &= ~VBIOWAIT; 1968 wakeup(&vp->v_numoutput); 1969 } 1970 } 1971 } 1972 1973 /* 1974 * Flush out and invalidate all buffers associated with a vnode. 1975 * Called with the underlying object locked. 1976 */ 1977 int 1978 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1979 int slpflag, uint64_t slptimeo) 1980 { 1981 struct buf *bp; 1982 struct buf *nbp, *blist; 1983 int s, error; 1984 1985 #ifdef VFSLCKDEBUG 1986 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1987 panic("%s: vp isn't locked, vp %p", __func__, vp); 1988 #endif 1989 1990 if (flags & V_SAVE) { 1991 s = splbio(); 1992 vwaitforio(vp, 0, "vinvalbuf", INFSLP); 1993 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1994 splx(s); 1995 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1996 return (error); 1997 s = splbio(); 1998 if (vp->v_numoutput > 0 || 1999 !LIST_EMPTY(&vp->v_dirtyblkhd)) 2000 panic("%s: dirty bufs, vp %p", __func__, vp); 2001 } 2002 splx(s); 2003 } 2004 loop: 2005 s = splbio(); 2006 for (;;) { 2007 int count = 0; 2008 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 2009 (flags & V_SAVEMETA)) 2010 while (blist && blist->b_lblkno < 0) 2011 blist = LIST_NEXT(blist, b_vnbufs); 2012 if (blist == NULL && 2013 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 2014 (flags & V_SAVEMETA)) 2015 while (blist && blist->b_lblkno < 0) 2016 blist = LIST_NEXT(blist, b_vnbufs); 2017 if (!blist) 2018 break; 2019 2020 for (bp = blist; bp; bp = nbp) { 2021 nbp = LIST_NEXT(bp, b_vnbufs); 2022 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 2023 continue; 2024 if (bp->b_flags & B_BUSY) { 2025 bp->b_flags |= B_WANTED; 2026 error = tsleep_nsec(bp, slpflag | (PRIBIO + 1), 2027 "vinvalbuf", slptimeo); 2028 if (error) { 2029 splx(s); 2030 return (error); 2031 } 2032 break; 2033 } 2034 bremfree(bp); 2035 /* 2036 * XXX Since there are no node locks for NFS, I believe 2037 * there is a slight chance that a delayed write will 2038 * occur while sleeping just above, so check for it. 2039 */ 2040 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 2041 buf_acquire(bp); 2042 splx(s); 2043 (void) VOP_BWRITE(bp); 2044 goto loop; 2045 } 2046 buf_acquire_nomap(bp); 2047 bp->b_flags |= B_INVAL; 2048 brelse(bp); 2049 count++; 2050 /* 2051 * XXX Temporary workaround XXX 2052 * 2053 * If this is a gigantisch vnode and we are 2054 * trashing a ton of buffers, drop the lock 2055 * and yield every so often. The longer term 2056 * fix is to add a separate list for these 2057 * invalid buffers so we don't have to do the 2058 * work to free these here. 2059 */ 2060 if (count > 100) { 2061 splx(s); 2062 sched_pause(yield); 2063 goto loop; 2064 } 2065 } 2066 } 2067 if (!(flags & V_SAVEMETA) && 2068 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 2069 panic("%s: flush failed, vp %p", __func__, vp); 2070 splx(s); 2071 return (0); 2072 } 2073 2074 void 2075 vflushbuf(struct vnode *vp, int sync) 2076 { 2077 struct buf *bp, *nbp; 2078 int s; 2079 2080 loop: 2081 s = splbio(); 2082 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 2083 if ((bp->b_flags & B_BUSY)) 2084 continue; 2085 if ((bp->b_flags & B_DELWRI) == 0) 2086 panic("vflushbuf: not dirty"); 2087 bremfree(bp); 2088 buf_acquire(bp); 2089 splx(s); 2090 /* 2091 * Wait for I/O associated with indirect blocks to complete, 2092 * since there is no way to quickly wait for them below. 2093 */ 2094 if (bp->b_vp == vp || sync == 0) 2095 (void) bawrite(bp); 2096 else 2097 (void) bwrite(bp); 2098 goto loop; 2099 } 2100 if (sync == 0) { 2101 splx(s); 2102 return; 2103 } 2104 vwaitforio(vp, 0, "vflushbuf", INFSLP); 2105 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 2106 splx(s); 2107 #ifdef DIAGNOSTIC 2108 vprint("vflushbuf: dirty", vp); 2109 #endif 2110 goto loop; 2111 } 2112 splx(s); 2113 } 2114 2115 /* 2116 * Associate a buffer with a vnode. 2117 * 2118 * Manipulates buffer vnode queues. Must be called at splbio(). 2119 */ 2120 void 2121 bgetvp(struct vnode *vp, struct buf *bp) 2122 { 2123 splassert(IPL_BIO); 2124 2125 2126 if (bp->b_vp) 2127 panic("bgetvp: not free"); 2128 vhold(vp); 2129 bp->b_vp = vp; 2130 if (vp->v_type == VBLK || vp->v_type == VCHR) 2131 bp->b_dev = vp->v_rdev; 2132 else 2133 bp->b_dev = NODEV; 2134 /* 2135 * Insert onto list for new vnode. 2136 */ 2137 bufinsvn(bp, &vp->v_cleanblkhd); 2138 } 2139 2140 /* 2141 * Disassociate a buffer from a vnode. 2142 * 2143 * Manipulates vnode buffer queues. Must be called at splbio(). 2144 */ 2145 void 2146 brelvp(struct buf *bp) 2147 { 2148 struct vnode *vp; 2149 2150 splassert(IPL_BIO); 2151 2152 if ((vp = bp->b_vp) == (struct vnode *) 0) 2153 panic("brelvp: NULL"); 2154 /* 2155 * Delete from old vnode list, if on one. 2156 */ 2157 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2158 bufremvn(bp); 2159 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2160 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2161 vp->v_bioflag &= ~VBIOONSYNCLIST; 2162 LIST_REMOVE(vp, v_synclist); 2163 } 2164 bp->b_vp = NULL; 2165 2166 vdrop(vp); 2167 } 2168 2169 /* 2170 * Replaces the current vnode associated with the buffer, if any, 2171 * with a new vnode. 2172 * 2173 * If an output I/O is pending on the buffer, the old vnode 2174 * I/O count is adjusted. 2175 * 2176 * Ignores vnode buffer queues. Must be called at splbio(). 2177 */ 2178 void 2179 buf_replacevnode(struct buf *bp, struct vnode *newvp) 2180 { 2181 struct vnode *oldvp = bp->b_vp; 2182 2183 splassert(IPL_BIO); 2184 2185 if (oldvp) 2186 brelvp(bp); 2187 2188 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2189 newvp->v_numoutput++; /* put it on swapdev */ 2190 vwakeup(oldvp); 2191 } 2192 2193 bgetvp(newvp, bp); 2194 bufremvn(bp); 2195 } 2196 2197 /* 2198 * Used to assign buffers to the appropriate clean or dirty list on 2199 * the vnode and to add newly dirty vnodes to the appropriate 2200 * filesystem syncer list. 2201 * 2202 * Manipulates vnode buffer queues. Must be called at splbio(). 2203 */ 2204 void 2205 reassignbuf(struct buf *bp) 2206 { 2207 struct buflists *listheadp; 2208 int delay; 2209 struct vnode *vp = bp->b_vp; 2210 2211 splassert(IPL_BIO); 2212 2213 /* 2214 * Delete from old vnode list, if on one. 2215 */ 2216 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2217 bufremvn(bp); 2218 2219 /* 2220 * If dirty, put on list of dirty buffers; 2221 * otherwise insert onto list of clean buffers. 2222 */ 2223 if ((bp->b_flags & B_DELWRI) == 0) { 2224 listheadp = &vp->v_cleanblkhd; 2225 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2226 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2227 vp->v_bioflag &= ~VBIOONSYNCLIST; 2228 LIST_REMOVE(vp, v_synclist); 2229 } 2230 } else { 2231 listheadp = &vp->v_dirtyblkhd; 2232 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2233 switch (vp->v_type) { 2234 case VDIR: 2235 delay = syncdelay / 2; 2236 break; 2237 case VBLK: 2238 if (vp->v_specmountpoint != NULL) { 2239 delay = syncdelay / 3; 2240 break; 2241 } 2242 /* FALLTHROUGH */ 2243 default: 2244 delay = syncdelay; 2245 } 2246 vn_syncer_add_to_worklist(vp, delay); 2247 } 2248 } 2249 bufinsvn(bp, listheadp); 2250 } 2251 2252 #ifdef DDB 2253 #include <machine/db_machdep.h> 2254 #include <ddb/db_interface.h> 2255 2256 void 2257 vfs_buf_print(void *b, int full, 2258 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2259 { 2260 struct buf *bp = b; 2261 2262 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2263 " proc %p error %d flags %lb\n", 2264 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2265 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2266 2267 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2268 " data %p saveaddr %p iodone %p\n", 2269 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2270 bp->b_data, bp->b_saveaddr, 2271 bp->b_iodone); 2272 2273 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2274 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2275 2276 } 2277 2278 const char *vtypes[] = { VTYPE_NAMES }; 2279 const char *vtags[] = { VTAG_NAMES }; 2280 2281 void 2282 vfs_vnode_print(void *v, int full, 2283 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2284 { 2285 struct vnode *vp = v; 2286 2287 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2288 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2289 vp->v_tag, 2290 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2291 vp->v_type, vp->v_mount, vp->v_mountedhere); 2292 2293 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2294 vp->v_data, vp->v_usecount, vp->v_writecount, 2295 vp->v_holdcnt, vp->v_numoutput); 2296 2297 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2298 2299 if (full) { 2300 struct buf *bp; 2301 2302 (*pr)("clean bufs:\n"); 2303 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2304 (*pr)(" bp %p\n", bp); 2305 vfs_buf_print(bp, full, pr); 2306 } 2307 2308 (*pr)("dirty bufs:\n"); 2309 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2310 (*pr)(" bp %p\n", bp); 2311 vfs_buf_print(bp, full, pr); 2312 } 2313 } 2314 } 2315 2316 void 2317 vfs_mount_print(struct mount *mp, int full, 2318 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2319 { 2320 struct vfsconf *vfc = mp->mnt_vfc; 2321 struct vnode *vp; 2322 int cnt; 2323 2324 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2325 mp->mnt_flag, MNT_BITS, 2326 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2327 2328 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", 2329 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2330 vfc->vfc_refcount, vfc->vfc_flags); 2331 2332 (*pr)("statvfs cache: bsize %x iosize %x\n" 2333 "blocks %llu free %llu avail %lld\n", 2334 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2335 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2336 2337 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2338 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2339 2340 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2341 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2342 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2343 2344 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2345 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2346 2347 (*pr)(" syncreads %llu asyncreads = %llu\n", 2348 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2349 2350 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2351 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2352 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2353 2354 (*pr)("locked vnodes:"); 2355 /* XXX would take mountlist lock, except ddb has no context */ 2356 cnt = 0; 2357 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2358 if (VOP_ISLOCKED(vp)) { 2359 if (cnt == 0) 2360 (*pr)("\n %p", vp); 2361 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2362 (*pr)(",\n %p", vp); 2363 else 2364 (*pr)(", %p", vp); 2365 cnt++; 2366 } 2367 } 2368 (*pr)("\n"); 2369 2370 if (full) { 2371 (*pr)("all vnodes:"); 2372 /* XXX would take mountlist lock, except ddb has no context */ 2373 cnt = 0; 2374 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2375 if (cnt == 0) 2376 (*pr)("\n %p", vp); 2377 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2378 (*pr)(",\n %p", vp); 2379 else 2380 (*pr)(", %p", vp); 2381 cnt++; 2382 } 2383 (*pr)("\n"); 2384 } 2385 } 2386 #endif /* DDB */ 2387 2388 void 2389 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2390 { 2391 const struct statfs *mbp; 2392 2393 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2394 2395 if (sbp == (mbp = &mp->mnt_stat)) 2396 return; 2397 2398 sbp->f_fsid = mbp->f_fsid; 2399 sbp->f_owner = mbp->f_owner; 2400 sbp->f_flags = mbp->f_flags; 2401 sbp->f_syncwrites = mbp->f_syncwrites; 2402 sbp->f_asyncwrites = mbp->f_asyncwrites; 2403 sbp->f_syncreads = mbp->f_syncreads; 2404 sbp->f_asyncreads = mbp->f_asyncreads; 2405 sbp->f_namemax = mbp->f_namemax; 2406 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2407 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2408 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2409 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2410 sizeof(union mount_info)); 2411 } 2412