Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/kern/vfs_subr.c
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1 /* $OpenBSD: vfs_subr.c,v 1.318 2022/12/26 19:25:49 miod 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 * Grab a particular vnode from the free list, increment its 631 * reference count and lock it. If the vnode lock bit is set, 632 * the vnode is being eliminated in vgone. In that case, we 633 * cannot grab it, so the process is awakened when the 634 * transition is completed, and an error code is returned to 635 * indicate that the vnode is no longer usable, possibly 636 * having been changed to a new file system type. 637 */ 638 int 639 vget(struct vnode *vp, int flags) 640 { 641 int error, s, onfreelist; 642 643 /* 644 * If the vnode is in the process of being cleaned out for 645 * another use, we wait for the cleaning to finish and then 646 * return failure. Cleaning is determined by checking that 647 * the VXLOCK flag is set. 648 */ 649 mtx_enter(&vnode_mtx); 650 if (vp->v_lflag & VXLOCK) { 651 if (flags & LK_NOWAIT) { 652 mtx_leave(&vnode_mtx); 653 return (EBUSY); 654 } 655 656 vp->v_lflag |= VXWANT; 657 msleep_nsec(vp, &vnode_mtx, PINOD, "vget", INFSLP); 658 mtx_leave(&vnode_mtx); 659 return (ENOENT); 660 } 661 mtx_leave(&vnode_mtx); 662 663 s = splbio(); 664 onfreelist = vp->v_bioflag & VBIOONFREELIST; 665 if (vp->v_usecount == 0 && onfreelist) { 666 if (vp->v_holdcnt > 0) 667 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 668 else 669 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 670 vp->v_bioflag &= ~VBIOONFREELIST; 671 } 672 splx(s); 673 674 vp->v_usecount++; 675 if (flags & LK_TYPE_MASK) { 676 if ((error = vn_lock(vp, flags)) != 0) { 677 vp->v_usecount--; 678 if (vp->v_usecount == 0 && onfreelist) 679 vputonfreelist(vp); 680 } 681 return (error); 682 } 683 684 return (0); 685 } 686 687 688 /* Vnode reference. */ 689 void 690 vref(struct vnode *vp) 691 { 692 KERNEL_ASSERT_LOCKED(); 693 694 #ifdef DIAGNOSTIC 695 if (vp->v_usecount == 0) 696 panic("vref used where vget required"); 697 if (vp->v_type == VNON) 698 panic("vref on a VNON vnode"); 699 #endif 700 vp->v_usecount++; 701 } 702 703 void 704 vputonfreelist(struct vnode *vp) 705 { 706 int s; 707 struct freelst *lst; 708 709 s = splbio(); 710 #ifdef DIAGNOSTIC 711 if (vp->v_usecount != 0) 712 panic("Use count is not zero!"); 713 714 /* 715 * If the hold count is still positive, one or many threads could still 716 * be waiting on the vnode lock inside uvn_io(). 717 */ 718 if (vp->v_holdcnt == 0 && vp->v_lockcount != 0) 719 panic("%s: lock count is not zero", __func__); 720 721 if (vp->v_bioflag & VBIOONFREELIST) { 722 vprint("vnode already on free list: ", vp); 723 panic("vnode already on free list"); 724 } 725 #endif 726 727 vp->v_bioflag |= VBIOONFREELIST; 728 vp->v_bioflag &= ~VBIOERROR; 729 730 if (vp->v_holdcnt > 0) 731 lst = &vnode_hold_list; 732 else 733 lst = &vnode_free_list; 734 735 if (vp->v_type == VBAD) 736 TAILQ_INSERT_HEAD(lst, vp, v_freelist); 737 else 738 TAILQ_INSERT_TAIL(lst, vp, v_freelist); 739 740 splx(s); 741 } 742 743 /* 744 * vput(), just unlock and vrele() 745 */ 746 void 747 vput(struct vnode *vp) 748 { 749 struct proc *p = curproc; 750 int s; 751 752 #ifdef DIAGNOSTIC 753 if (vp == NULL) 754 panic("vput: null vp"); 755 #endif 756 757 #ifdef DIAGNOSTIC 758 if (vp->v_usecount == 0) { 759 vprint("vput: bad ref count", vp); 760 panic("vput: ref cnt"); 761 } 762 #endif 763 vp->v_usecount--; 764 KASSERT(vp->v_usecount > 0 || vp->v_uvcount == 0); 765 if (vp->v_usecount > 0) { 766 VOP_UNLOCK(vp); 767 return; 768 } 769 770 #ifdef DIAGNOSTIC 771 if (vp->v_writecount != 0) { 772 vprint("vput: bad writecount", vp); 773 panic("vput: v_writecount != 0"); 774 } 775 #endif 776 777 VOP_INACTIVE(vp, p); 778 779 s = splbio(); 780 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 781 vputonfreelist(vp); 782 splx(s); 783 } 784 785 /* 786 * Vnode release - use for active VNODES. 787 * If count drops to zero, call inactive routine and return to freelist. 788 * Returns 0 if it did not sleep. 789 */ 790 int 791 vrele(struct vnode *vp) 792 { 793 struct proc *p = curproc; 794 int s; 795 796 #ifdef DIAGNOSTIC 797 if (vp == NULL) 798 panic("vrele: null vp"); 799 #endif 800 #ifdef DIAGNOSTIC 801 if (vp->v_usecount == 0) { 802 vprint("vrele: bad ref count", vp); 803 panic("vrele: ref cnt"); 804 } 805 #endif 806 vp->v_usecount--; 807 if (vp->v_usecount > 0) { 808 return (0); 809 } 810 811 #ifdef DIAGNOSTIC 812 if (vp->v_writecount != 0) { 813 vprint("vrele: bad writecount", vp); 814 panic("vrele: v_writecount != 0"); 815 } 816 #endif 817 818 if (vn_lock(vp, LK_EXCLUSIVE)) { 819 #ifdef DIAGNOSTIC 820 vprint("vrele: cannot lock", vp); 821 #endif 822 return (1); 823 } 824 825 VOP_INACTIVE(vp, p); 826 827 s = splbio(); 828 if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST)) 829 vputonfreelist(vp); 830 splx(s); 831 return (1); 832 } 833 834 /* Page or buffer structure gets a reference. */ 835 void 836 vhold(struct vnode *vp) 837 { 838 int s; 839 840 s = splbio(); 841 842 /* 843 * If it is on the freelist and the hold count is currently 844 * zero, move it to the hold list. 845 */ 846 if ((vp->v_bioflag & VBIOONFREELIST) && 847 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 848 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 849 TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist); 850 } 851 vp->v_holdcnt++; 852 853 splx(s); 854 } 855 856 /* Lose interest in a vnode. */ 857 void 858 vdrop(struct vnode *vp) 859 { 860 int s; 861 862 s = splbio(); 863 864 #ifdef DIAGNOSTIC 865 if (vp->v_holdcnt == 0) 866 panic("vdrop: zero holdcnt"); 867 #endif 868 869 vp->v_holdcnt--; 870 871 /* 872 * If it is on the holdlist and the hold count drops to 873 * zero, move it to the free list. 874 */ 875 if ((vp->v_bioflag & VBIOONFREELIST) && 876 vp->v_holdcnt == 0 && vp->v_usecount == 0) { 877 TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist); 878 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 879 } 880 881 splx(s); 882 } 883 884 /* 885 * Remove any vnodes in the vnode table belonging to mount point mp. 886 * 887 * If MNT_NOFORCE is specified, there should not be any active ones, 888 * return error if any are found (nb: this is a user error, not a 889 * system error). If MNT_FORCE is specified, detach any active vnodes 890 * that are found. 891 */ 892 #ifdef DEBUG_SYSCTL 893 int busyprt = 0; /* print out busy vnodes */ 894 struct ctldebug debug_vfs_busyprt = { "vfs_busyprt", &busyprt }; 895 #endif 896 897 int 898 vfs_mount_foreach_vnode(struct mount *mp, 899 int (*func)(struct vnode *, void *), void *arg) { 900 struct vnode *vp, *nvp; 901 int error = 0; 902 903 loop: 904 TAILQ_FOREACH_SAFE(vp , &mp->mnt_vnodelist, v_mntvnodes, nvp) { 905 if (vp->v_mount != mp) 906 goto loop; 907 908 error = func(vp, arg); 909 910 if (error != 0) 911 break; 912 } 913 914 return (error); 915 } 916 917 struct vflush_args { 918 struct vnode *skipvp; 919 int busy; 920 int flags; 921 }; 922 923 int 924 vflush_vnode(struct vnode *vp, void *arg) 925 { 926 struct vflush_args *va = arg; 927 struct proc *p = curproc; 928 int empty, s; 929 930 if (vp == va->skipvp) { 931 return (0); 932 } 933 934 if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 935 return (0); 936 } 937 938 /* 939 * If WRITECLOSE is set, only flush out regular file 940 * vnodes open for writing. 941 */ 942 if ((va->flags & WRITECLOSE) && 943 (vp->v_writecount == 0 || vp->v_type != VREG)) { 944 return (0); 945 } 946 947 /* 948 * With v_usecount == 0, all we need to do is clear 949 * out the vnode data structures and we are done. 950 */ 951 if (vp->v_usecount == 0) { 952 vgonel(vp, p); 953 return (0); 954 } 955 956 /* 957 * If FORCECLOSE is set, forcibly close the vnode. 958 * For block or character devices, revert to an 959 * anonymous device. For all other files, just kill them. 960 */ 961 if (va->flags & FORCECLOSE) { 962 if (vp->v_type != VBLK && vp->v_type != VCHR) { 963 vgonel(vp, p); 964 } else { 965 vclean(vp, 0, p); 966 vp->v_op = &spec_vops; 967 insmntque(vp, NULL); 968 } 969 return (0); 970 } 971 972 /* 973 * If set, this is allowed to ignore vnodes which don't 974 * have changes pending to disk. 975 * XXX Might be nice to check per-fs "inode" flags, but 976 * generally the filesystem is sync'd already, right? 977 */ 978 s = splbio(); 979 empty = (va->flags & IGNORECLEAN) && LIST_EMPTY(&vp->v_dirtyblkhd); 980 splx(s); 981 982 if (empty) 983 return (0); 984 985 #ifdef DEBUG_SYSCTL 986 if (busyprt) 987 vprint("vflush: busy vnode", vp); 988 #endif 989 va->busy++; 990 return (0); 991 } 992 993 int 994 vflush(struct mount *mp, struct vnode *skipvp, int flags) 995 { 996 struct vflush_args va; 997 va.skipvp = skipvp; 998 va.busy = 0; 999 va.flags = flags; 1000 1001 vfs_mount_foreach_vnode(mp, vflush_vnode, &va); 1002 1003 if (va.busy) 1004 return (EBUSY); 1005 return (0); 1006 } 1007 1008 /* 1009 * Disassociate the underlying file system from a vnode. 1010 */ 1011 void 1012 vclean(struct vnode *vp, int flags, struct proc *p) 1013 { 1014 int active, do_wakeup = 0; 1015 int s; 1016 1017 /* 1018 * Check to see if the vnode is in use. 1019 * If so we have to reference it before we clean it out 1020 * so that its count cannot fall to zero and generate a 1021 * race against ourselves to recycle it. 1022 */ 1023 if ((active = vp->v_usecount) != 0) 1024 vp->v_usecount++; 1025 1026 /* 1027 * Prevent the vnode from being recycled or 1028 * brought into use while we clean it out. 1029 */ 1030 mtx_enter(&vnode_mtx); 1031 if (vp->v_lflag & VXLOCK) 1032 panic("vclean: deadlock"); 1033 vp->v_lflag |= VXLOCK; 1034 1035 if (vp->v_lockcount > 0) { 1036 /* 1037 * Ensure that any thread currently waiting on the same lock has 1038 * observed that the vnode is about to be exclusively locked 1039 * before continuing. 1040 */ 1041 msleep_nsec(&vp->v_lockcount, &vnode_mtx, PINOD, "vop_lock", 1042 INFSLP); 1043 KASSERT(vp->v_lockcount == 0); 1044 } 1045 mtx_leave(&vnode_mtx); 1046 1047 /* 1048 * Even if the count is zero, the VOP_INACTIVE routine may still 1049 * have the object locked while it cleans it out. The VOP_LOCK 1050 * ensures that the VOP_INACTIVE routine is done with its work. 1051 * For active vnodes, it ensures that no other activity can 1052 * occur while the underlying object is being cleaned out. 1053 */ 1054 VOP_LOCK(vp, LK_EXCLUSIVE | LK_DRAIN); 1055 1056 /* 1057 * Clean out any VM data associated with the vnode. 1058 */ 1059 uvm_vnp_terminate(vp); 1060 /* 1061 * Clean out any buffers associated with the vnode. 1062 */ 1063 if (flags & DOCLOSE) 1064 vinvalbuf(vp, V_SAVE, NOCRED, p, 0, INFSLP); 1065 /* 1066 * If purging an active vnode, it must be closed and 1067 * deactivated before being reclaimed. Note that the 1068 * VOP_INACTIVE will unlock the vnode 1069 */ 1070 if (active) { 1071 if (flags & DOCLOSE) 1072 VOP_CLOSE(vp, FNONBLOCK, NOCRED, p); 1073 VOP_INACTIVE(vp, p); 1074 } else { 1075 /* 1076 * Any other processes trying to obtain this lock must first 1077 * wait for VXLOCK to clear, then call the new lock operation. 1078 */ 1079 VOP_UNLOCK(vp); 1080 } 1081 1082 /* 1083 * Reclaim the vnode. 1084 */ 1085 if (VOP_RECLAIM(vp, p)) 1086 panic("vclean: cannot reclaim"); 1087 if (active) { 1088 vp->v_usecount--; 1089 if (vp->v_usecount == 0) { 1090 s = splbio(); 1091 if (vp->v_holdcnt > 0) 1092 panic("vclean: not clean"); 1093 vputonfreelist(vp); 1094 splx(s); 1095 } 1096 } 1097 cache_purge(vp); 1098 1099 /* 1100 * Done with purge, notify sleepers of the grim news. 1101 */ 1102 vp->v_op = &dead_vops; 1103 VN_KNOTE(vp, NOTE_REVOKE); 1104 vp->v_tag = VT_NON; 1105 #ifdef VFSLCKDEBUG 1106 vp->v_flag &= ~VLOCKSWORK; 1107 #endif 1108 mtx_enter(&vnode_mtx); 1109 vp->v_lflag &= ~VXLOCK; 1110 if (vp->v_lflag & VXWANT) { 1111 vp->v_lflag &= ~VXWANT; 1112 do_wakeup = 1; 1113 } 1114 mtx_leave(&vnode_mtx); 1115 if (do_wakeup) 1116 wakeup(vp); 1117 } 1118 1119 /* 1120 * Recycle an unused vnode to the front of the free list. 1121 */ 1122 int 1123 vrecycle(struct vnode *vp, struct proc *p) 1124 { 1125 if (vp->v_usecount == 0) { 1126 vgonel(vp, p); 1127 return (1); 1128 } 1129 return (0); 1130 } 1131 1132 /* 1133 * Eliminate all activity associated with a vnode 1134 * in preparation for reuse. 1135 */ 1136 void 1137 vgone(struct vnode *vp) 1138 { 1139 struct proc *p = curproc; 1140 vgonel(vp, p); 1141 } 1142 1143 /* 1144 * vgone, with struct proc. 1145 */ 1146 void 1147 vgonel(struct vnode *vp, struct proc *p) 1148 { 1149 struct vnode *vq; 1150 struct vnode *vx; 1151 int s; 1152 1153 KASSERT(vp->v_uvcount == 0); 1154 1155 /* 1156 * If a vgone (or vclean) is already in progress, 1157 * wait until it is done and return. 1158 */ 1159 mtx_enter(&vnode_mtx); 1160 if (vp->v_lflag & VXLOCK) { 1161 vp->v_lflag |= VXWANT; 1162 msleep_nsec(vp, &vnode_mtx, PINOD, "vgone", INFSLP); 1163 mtx_leave(&vnode_mtx); 1164 return; 1165 } 1166 mtx_leave(&vnode_mtx); 1167 1168 /* 1169 * Clean out the filesystem specific data. 1170 */ 1171 vclean(vp, DOCLOSE, p); 1172 /* 1173 * Delete from old mount point vnode list, if on one. 1174 */ 1175 if (vp->v_mount != NULL) 1176 insmntque(vp, NULL); 1177 /* 1178 * If special device, remove it from special device alias list 1179 * if it is on one. 1180 */ 1181 if ((vp->v_type == VBLK || vp->v_type == VCHR) && 1182 vp->v_specinfo != NULL) { 1183 if ((vp->v_flag & VALIASED) == 0 && vp->v_type == VCHR && 1184 (cdevsw[major(vp->v_rdev)].d_flags & D_CLONE) && 1185 (minor(vp->v_rdev) >> CLONE_SHIFT == 0)) { 1186 free(vp->v_specbitmap, M_VNODE, CLONE_MAPSZ); 1187 } 1188 SLIST_REMOVE(vp->v_hashchain, vp, vnode, v_specnext); 1189 if (vp->v_flag & VALIASED) { 1190 vx = NULL; 1191 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1192 if (vq->v_rdev != vp->v_rdev || 1193 vq->v_type != vp->v_type) 1194 continue; 1195 if (vx) 1196 break; 1197 vx = vq; 1198 } 1199 if (vx == NULL) 1200 panic("missing alias"); 1201 if (vq == NULL) 1202 vx->v_flag &= ~VALIASED; 1203 vp->v_flag &= ~VALIASED; 1204 } 1205 lf_purgelocks(&vp->v_speclockf); 1206 free(vp->v_specinfo, M_VNODE, sizeof(struct specinfo)); 1207 vp->v_specinfo = NULL; 1208 } 1209 /* 1210 * If it is on the freelist and not already at the head, 1211 * move it to the head of the list. 1212 */ 1213 vp->v_type = VBAD; 1214 1215 /* 1216 * Move onto the free list, unless we were called from 1217 * getnewvnode and we're not on any free list 1218 */ 1219 s = splbio(); 1220 if (vp->v_usecount == 0 && 1221 (vp->v_bioflag & VBIOONFREELIST)) { 1222 if (vp->v_holdcnt > 0) 1223 panic("vgonel: not clean"); 1224 1225 if (TAILQ_FIRST(&vnode_free_list) != vp) { 1226 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 1227 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 1228 } 1229 } 1230 splx(s); 1231 } 1232 1233 /* 1234 * Lookup a vnode by device number. 1235 */ 1236 int 1237 vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) 1238 { 1239 struct vnode *vp; 1240 int rc =0; 1241 1242 SLIST_FOREACH(vp, &speclisth[SPECHASH(dev)], v_specnext) { 1243 if (dev != vp->v_rdev || type != vp->v_type) 1244 continue; 1245 *vpp = vp; 1246 rc = 1; 1247 break; 1248 } 1249 return (rc); 1250 } 1251 1252 /* 1253 * Revoke all the vnodes corresponding to the specified minor number 1254 * range (endpoints inclusive) of the specified major. 1255 */ 1256 void 1257 vdevgone(int maj, int minl, int minh, enum vtype type) 1258 { 1259 struct vnode *vp; 1260 int mn; 1261 1262 for (mn = minl; mn <= minh; mn++) 1263 if (vfinddev(makedev(maj, mn), type, &vp)) 1264 VOP_REVOKE(vp, REVOKEALL); 1265 } 1266 1267 /* 1268 * Calculate the total number of references to a special device. 1269 */ 1270 int 1271 vcount(struct vnode *vp) 1272 { 1273 struct vnode *vq; 1274 int count; 1275 1276 loop: 1277 if ((vp->v_flag & VALIASED) == 0) 1278 return (vp->v_usecount); 1279 count = 0; 1280 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1281 if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) 1282 continue; 1283 /* 1284 * Alias, but not in use, so flush it out. 1285 */ 1286 if (vq->v_usecount == 0 && vq != vp) { 1287 vgone(vq); 1288 goto loop; 1289 } 1290 count += vq->v_usecount; 1291 } 1292 return (count); 1293 } 1294 1295 #if defined(DEBUG) || defined(DIAGNOSTIC) 1296 /* 1297 * Print out a description of a vnode. 1298 */ 1299 static char *typename[] = 1300 { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; 1301 1302 void 1303 vprint(char *label, struct vnode *vp) 1304 { 1305 char buf[64]; 1306 1307 if (label != NULL) 1308 printf("%s: ", label); 1309 printf("%p, type %s, use %u, write %u, hold %u,", 1310 vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount, 1311 vp->v_holdcnt); 1312 buf[0] = '\0'; 1313 if (vp->v_flag & VROOT) 1314 strlcat(buf, "|VROOT", sizeof buf); 1315 if (vp->v_flag & VTEXT) 1316 strlcat(buf, "|VTEXT", sizeof buf); 1317 if (vp->v_flag & VSYSTEM) 1318 strlcat(buf, "|VSYSTEM", sizeof buf); 1319 if (vp->v_lflag & VXLOCK) 1320 strlcat(buf, "|VXLOCK", sizeof buf); 1321 if (vp->v_lflag & VXWANT) 1322 strlcat(buf, "|VXWANT", sizeof buf); 1323 if (vp->v_bioflag & VBIOWAIT) 1324 strlcat(buf, "|VBIOWAIT", sizeof buf); 1325 if (vp->v_bioflag & VBIOONFREELIST) 1326 strlcat(buf, "|VBIOONFREELIST", sizeof buf); 1327 if (vp->v_bioflag & VBIOONSYNCLIST) 1328 strlcat(buf, "|VBIOONSYNCLIST", sizeof buf); 1329 if (vp->v_flag & VALIASED) 1330 strlcat(buf, "|VALIASED", sizeof buf); 1331 if (buf[0] != '\0') 1332 printf(" flags (%s)", &buf[1]); 1333 if (vp->v_data == NULL) { 1334 printf("\n"); 1335 } else { 1336 printf("\n\t"); 1337 VOP_PRINT(vp); 1338 } 1339 } 1340 #endif /* DEBUG || DIAGNOSTIC */ 1341 1342 #ifdef DEBUG 1343 /* 1344 * List all of the locked vnodes in the system. 1345 * Called when debugging the kernel. 1346 */ 1347 void 1348 printlockedvnodes(void) 1349 { 1350 struct mount *mp; 1351 struct vnode *vp; 1352 1353 printf("Locked vnodes\n"); 1354 1355 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1356 if (vfs_busy(mp, VB_READ|VB_NOWAIT)) 1357 continue; 1358 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 1359 if (VOP_ISLOCKED(vp)) 1360 vprint(NULL, vp); 1361 } 1362 vfs_unbusy(mp); 1363 } 1364 1365 } 1366 #endif 1367 1368 /* 1369 * Top level filesystem related information gathering. 1370 */ 1371 int 1372 vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1373 size_t newlen, struct proc *p) 1374 { 1375 struct vfsconf *vfsp, *tmpvfsp; 1376 int ret; 1377 1378 /* all sysctl names at this level are at least name and field */ 1379 if (namelen < 2) 1380 return (ENOTDIR); /* overloaded */ 1381 1382 if (name[0] != VFS_GENERIC) { 1383 vfsp = vfs_bytypenum(name[0]); 1384 if (vfsp == NULL || vfsp->vfc_vfsops->vfs_sysctl == NULL) 1385 return (EOPNOTSUPP); 1386 1387 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 1388 oldp, oldlenp, newp, newlen, p)); 1389 } 1390 1391 switch (name[1]) { 1392 case VFS_MAXTYPENUM: 1393 return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf)); 1394 1395 case VFS_CONF: 1396 if (namelen < 3) 1397 return (ENOTDIR); /* overloaded */ 1398 1399 vfsp = vfs_bytypenum(name[2]); 1400 if (vfsp == NULL) 1401 return (EOPNOTSUPP); 1402 1403 /* Make a copy, clear out kernel pointers */ 1404 tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK|M_ZERO); 1405 memcpy(tmpvfsp, vfsp, sizeof(*tmpvfsp)); 1406 tmpvfsp->vfc_vfsops = NULL; 1407 1408 ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp, 1409 sizeof(struct vfsconf)); 1410 1411 free(tmpvfsp, M_TEMP, sizeof(*tmpvfsp)); 1412 return (ret); 1413 case VFS_BCACHESTAT: /* buffer cache statistics */ 1414 ret = sysctl_rdstruct(oldp, oldlenp, newp, &bcstats, 1415 sizeof(struct bcachestats)); 1416 return(ret); 1417 } 1418 return (EOPNOTSUPP); 1419 } 1420 1421 /* 1422 * Check to see if a filesystem is mounted on a block device. 1423 */ 1424 int 1425 vfs_mountedon(struct vnode *vp) 1426 { 1427 struct vnode *vq; 1428 int error = 0; 1429 1430 if (vp->v_specmountpoint != NULL) 1431 return (EBUSY); 1432 if (vp->v_flag & VALIASED) { 1433 SLIST_FOREACH(vq, vp->v_hashchain, v_specnext) { 1434 if (vq->v_rdev != vp->v_rdev || 1435 vq->v_type != vp->v_type) 1436 continue; 1437 if (vq->v_specmountpoint != NULL) { 1438 error = EBUSY; 1439 break; 1440 } 1441 } 1442 } 1443 return (error); 1444 } 1445 1446 #ifdef NFSSERVER 1447 /* 1448 * Build hash lists of net addresses and hang them off the mount point. 1449 * Called by vfs_export() to set up the lists of export addresses. 1450 */ 1451 int 1452 vfs_hang_addrlist(struct mount *mp, struct netexport *nep, 1453 struct export_args *argp) 1454 { 1455 struct netcred *np; 1456 struct radix_node_head *rnh; 1457 int nplen, i; 1458 struct radix_node *rn; 1459 struct sockaddr *saddr, *smask = NULL; 1460 int error; 1461 1462 if (argp->ex_addrlen == 0) { 1463 if (mp->mnt_flag & MNT_DEFEXPORTED) 1464 return (EPERM); 1465 np = &nep->ne_defexported; 1466 /* fill in the kernel's ucred from userspace's xucred */ 1467 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1468 return (error); 1469 mp->mnt_flag |= MNT_DEFEXPORTED; 1470 goto finish; 1471 } 1472 if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN || 1473 argp->ex_addrlen < 0 || argp->ex_masklen < 0) 1474 return (EINVAL); 1475 nplen = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 1476 np = (struct netcred *)malloc(nplen, M_NETADDR, M_WAITOK|M_ZERO); 1477 np->netc_len = nplen; 1478 saddr = (struct sockaddr *)(np + 1); 1479 error = copyin(argp->ex_addr, saddr, argp->ex_addrlen); 1480 if (error) 1481 goto out; 1482 if (saddr->sa_len > argp->ex_addrlen) 1483 saddr->sa_len = argp->ex_addrlen; 1484 if (argp->ex_masklen) { 1485 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); 1486 error = copyin(argp->ex_mask, smask, argp->ex_masklen); 1487 if (error) 1488 goto out; 1489 if (smask->sa_len > argp->ex_masklen) 1490 smask->sa_len = argp->ex_masklen; 1491 } 1492 /* fill in the kernel's ucred from userspace's xucred */ 1493 if ((error = crfromxucred(&np->netc_anon, &argp->ex_anon))) 1494 goto out; 1495 i = saddr->sa_family; 1496 switch (i) { 1497 case AF_INET: 1498 if ((rnh = nep->ne_rtable_inet) == NULL) { 1499 if (!rn_inithead((void **)&nep->ne_rtable_inet, 1500 offsetof(struct sockaddr_in, sin_addr))) { 1501 error = ENOBUFS; 1502 goto out; 1503 } 1504 rnh = nep->ne_rtable_inet; 1505 } 1506 break; 1507 default: 1508 error = EINVAL; 1509 goto out; 1510 } 1511 rn = rn_addroute(saddr, smask, rnh, np->netc_rnodes, 0); 1512 if (rn == NULL || np != (struct netcred *)rn) { /* already exists */ 1513 error = EPERM; 1514 goto out; 1515 } 1516 finish: 1517 np->netc_exflags = argp->ex_flags; 1518 return (0); 1519 out: 1520 free(np, M_NETADDR, np->netc_len); 1521 return (error); 1522 } 1523 1524 int 1525 vfs_free_netcred(struct radix_node *rn, void *w, u_int id) 1526 { 1527 struct radix_node_head *rnh = (struct radix_node_head *)w; 1528 struct netcred * np = (struct netcred *)rn; 1529 1530 rn_delete(rn->rn_key, rn->rn_mask, rnh, NULL); 1531 free(np, M_NETADDR, np->netc_len); 1532 return (0); 1533 } 1534 1535 /* 1536 * Free the net address hash lists that are hanging off the mount points. 1537 */ 1538 void 1539 vfs_free_addrlist(struct netexport *nep) 1540 { 1541 struct radix_node_head *rnh; 1542 1543 if ((rnh = nep->ne_rtable_inet) != NULL) { 1544 rn_walktree(rnh, vfs_free_netcred, rnh); 1545 free(rnh, M_RTABLE, sizeof(*rnh)); 1546 nep->ne_rtable_inet = NULL; 1547 } 1548 } 1549 #endif /* NFSSERVER */ 1550 1551 int 1552 vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) 1553 { 1554 #ifdef NFSSERVER 1555 int error; 1556 1557 if (argp->ex_flags & MNT_DELEXPORT) { 1558 vfs_free_addrlist(nep); 1559 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 1560 } 1561 if (argp->ex_flags & MNT_EXPORTED) { 1562 if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0) 1563 return (error); 1564 mp->mnt_flag |= MNT_EXPORTED; 1565 } 1566 return (0); 1567 #else 1568 return (ENOTSUP); 1569 #endif /* NFSSERVER */ 1570 } 1571 1572 struct netcred * 1573 vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam) 1574 { 1575 #ifdef NFSSERVER 1576 struct netcred *np; 1577 struct radix_node_head *rnh; 1578 struct sockaddr *saddr; 1579 1580 np = NULL; 1581 if (mp->mnt_flag & MNT_EXPORTED) { 1582 /* 1583 * Lookup in the export list first. 1584 */ 1585 if (nam != NULL) { 1586 saddr = mtod(nam, struct sockaddr *); 1587 switch(saddr->sa_family) { 1588 case AF_INET: 1589 rnh = nep->ne_rtable_inet; 1590 break; 1591 default: 1592 rnh = NULL; 1593 break; 1594 } 1595 if (rnh != NULL) 1596 np = (struct netcred *)rn_match(saddr, rnh); 1597 } 1598 /* 1599 * If no address match, use the default if it exists. 1600 */ 1601 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 1602 np = &nep->ne_defexported; 1603 } 1604 return (np); 1605 #else 1606 return (NULL); 1607 #endif /* NFSSERVER */ 1608 } 1609 1610 /* 1611 * Do the usual access checking. 1612 * file_mode, uid and gid are from the vnode in question, 1613 * while acc_mode and cred are from the VOP_ACCESS parameter list 1614 */ 1615 int 1616 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid, 1617 mode_t acc_mode, struct ucred *cred) 1618 { 1619 mode_t mask; 1620 1621 /* User id 0 always gets read/write access. */ 1622 if (cred->cr_uid == 0) { 1623 /* For VEXEC, at least one of the execute bits must be set. */ 1624 if ((acc_mode & VEXEC) && type != VDIR && 1625 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) 1626 return EACCES; 1627 return 0; 1628 } 1629 1630 mask = 0; 1631 1632 /* Otherwise, check the owner. */ 1633 if (cred->cr_uid == uid) { 1634 if (acc_mode & VEXEC) 1635 mask |= S_IXUSR; 1636 if (acc_mode & VREAD) 1637 mask |= S_IRUSR; 1638 if (acc_mode & VWRITE) 1639 mask |= S_IWUSR; 1640 return (file_mode & mask) == mask ? 0 : EACCES; 1641 } 1642 1643 /* Otherwise, check the groups. */ 1644 if (groupmember(gid, cred)) { 1645 if (acc_mode & VEXEC) 1646 mask |= S_IXGRP; 1647 if (acc_mode & VREAD) 1648 mask |= S_IRGRP; 1649 if (acc_mode & VWRITE) 1650 mask |= S_IWGRP; 1651 return (file_mode & mask) == mask ? 0 : EACCES; 1652 } 1653 1654 /* Otherwise, check everyone else. */ 1655 if (acc_mode & VEXEC) 1656 mask |= S_IXOTH; 1657 if (acc_mode & VREAD) 1658 mask |= S_IROTH; 1659 if (acc_mode & VWRITE) 1660 mask |= S_IWOTH; 1661 return (file_mode & mask) == mask ? 0 : EACCES; 1662 } 1663 1664 int 1665 vnoperm(struct vnode *vp) 1666 { 1667 if (vp->v_flag & VROOT || vp->v_mount == NULL) 1668 return 0; 1669 1670 return (vp->v_mount->mnt_flag & MNT_NOPERM); 1671 } 1672 1673 struct rwlock vfs_stall_lock = RWLOCK_INITIALIZER("vfs_stall"); 1674 unsigned int vfs_stalling = 0; 1675 1676 int 1677 vfs_stall(struct proc *p, int stall) 1678 { 1679 struct mount *mp; 1680 int allerror = 0, error; 1681 1682 if (stall) { 1683 atomic_inc_int(&vfs_stalling); 1684 rw_enter_write(&vfs_stall_lock); 1685 } 1686 1687 /* 1688 * The loop variable mp is protected by vfs_busy() so that it cannot 1689 * be unmounted while VFS_SYNC() sleeps. Traverse forward to keep the 1690 * lock order consistent with dounmount(). 1691 */ 1692 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 1693 if (stall) { 1694 error = vfs_busy(mp, VB_WRITE|VB_WAIT|VB_DUPOK); 1695 if (error) { 1696 printf("%s: busy\n", mp->mnt_stat.f_mntonname); 1697 allerror = error; 1698 continue; 1699 } 1700 uvm_vnp_sync(mp); 1701 error = VFS_SYNC(mp, MNT_WAIT, stall, p->p_ucred, p); 1702 if (error) { 1703 printf("%s: failed to sync\n", 1704 mp->mnt_stat.f_mntonname); 1705 vfs_unbusy(mp); 1706 allerror = error; 1707 continue; 1708 } 1709 mp->mnt_flag |= MNT_STALLED; 1710 } else { 1711 if (mp->mnt_flag & MNT_STALLED) { 1712 vfs_unbusy(mp); 1713 mp->mnt_flag &= ~MNT_STALLED; 1714 } 1715 } 1716 } 1717 1718 if (!stall) { 1719 rw_exit_write(&vfs_stall_lock); 1720 atomic_dec_int(&vfs_stalling); 1721 } 1722 1723 return (allerror); 1724 } 1725 1726 void 1727 vfs_stall_barrier(void) 1728 { 1729 if (__predict_false(vfs_stalling)) { 1730 rw_enter_read(&vfs_stall_lock); 1731 rw_exit_read(&vfs_stall_lock); 1732 } 1733 } 1734 1735 /* 1736 * Unmount all file systems. 1737 * We traverse the list in reverse order under the assumption that doing so 1738 * will avoid needing to worry about dependencies. 1739 */ 1740 void 1741 vfs_unmountall(void) 1742 { 1743 struct mount *mp, *nmp; 1744 int allerror, error, again = 1; 1745 1746 retry: 1747 allerror = 0; 1748 TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { 1749 if (vfs_busy(mp, VB_WRITE|VB_NOWAIT)) 1750 continue; 1751 /* XXX Here is a race, the next pointer is not locked. */ 1752 if ((error = dounmount(mp, MNT_FORCE, curproc)) != 0) { 1753 printf("unmount of %s failed with error %d\n", 1754 mp->mnt_stat.f_mntonname, error); 1755 allerror = 1; 1756 } 1757 } 1758 1759 if (allerror) { 1760 printf("WARNING: some file systems would not unmount\n"); 1761 if (again) { 1762 printf("retrying\n"); 1763 again = 0; 1764 goto retry; 1765 } 1766 } 1767 } 1768 1769 /* 1770 * Sync and unmount file systems before shutting down. 1771 */ 1772 void 1773 vfs_shutdown(struct proc *p) 1774 { 1775 #ifdef ACCOUNTING 1776 acct_shutdown(); 1777 #endif 1778 1779 printf("syncing disks..."); 1780 1781 if (panicstr == NULL) { 1782 /* Sync before unmount, in case we hang on something. */ 1783 sys_sync(p, NULL, NULL); 1784 vfs_unmountall(); 1785 } 1786 1787 #if NSOFTRAID > 0 1788 sr_quiesce(); 1789 #endif 1790 1791 if (vfs_syncwait(p, 1)) 1792 printf(" giving up\n"); 1793 else 1794 printf(" done\n"); 1795 } 1796 1797 /* 1798 * perform sync() operation and wait for buffers to flush. 1799 */ 1800 int 1801 vfs_syncwait(struct proc *p, int verbose) 1802 { 1803 struct buf *bp; 1804 int iter, nbusy, dcount, s; 1805 #ifdef MULTIPROCESSOR 1806 int hold_count; 1807 #endif 1808 1809 sys_sync(p, NULL, NULL); 1810 1811 /* Wait for sync to finish. */ 1812 dcount = 10000; 1813 for (iter = 0; iter < 20; iter++) { 1814 nbusy = 0; 1815 LIST_FOREACH(bp, &bufhead, b_list) { 1816 if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY) 1817 nbusy++; 1818 /* 1819 * With soft updates, some buffers that are 1820 * written will be remarked as dirty until other 1821 * buffers are written. 1822 */ 1823 if (bp->b_flags & B_DELWRI) { 1824 s = splbio(); 1825 bremfree(bp); 1826 buf_acquire(bp); 1827 splx(s); 1828 nbusy++; 1829 bawrite(bp); 1830 if (dcount-- <= 0) { 1831 if (verbose) 1832 printf("softdep "); 1833 return 1; 1834 } 1835 } 1836 } 1837 if (nbusy == 0) 1838 break; 1839 if (verbose) 1840 printf("%d ", nbusy); 1841 #ifdef MULTIPROCESSOR 1842 if (_kernel_lock_held()) 1843 hold_count = __mp_release_all(&kernel_lock); 1844 else 1845 hold_count = 0; 1846 #endif 1847 DELAY(40000 * iter); 1848 #ifdef MULTIPROCESSOR 1849 if (hold_count) 1850 __mp_acquire_count(&kernel_lock, hold_count); 1851 #endif 1852 } 1853 1854 return nbusy; 1855 } 1856 1857 /* 1858 * posix file system related system variables. 1859 */ 1860 int 1861 fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1862 void *newp, size_t newlen, struct proc *p) 1863 { 1864 /* all sysctl names at this level are terminal */ 1865 if (namelen != 1) 1866 return (ENOTDIR); 1867 1868 switch (name[0]) { 1869 case FS_POSIX_SETUID: 1870 return (sysctl_securelevel_int(oldp, oldlenp, newp, newlen, 1871 &suid_clear)); 1872 default: 1873 return (EOPNOTSUPP); 1874 } 1875 /* NOTREACHED */ 1876 } 1877 1878 /* 1879 * file system related system variables. 1880 */ 1881 int 1882 fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, 1883 size_t newlen, struct proc *p) 1884 { 1885 sysctlfn *fn; 1886 1887 switch (name[0]) { 1888 case FS_POSIX: 1889 fn = fs_posix_sysctl; 1890 break; 1891 default: 1892 return (EOPNOTSUPP); 1893 } 1894 return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p); 1895 } 1896 1897 1898 /* 1899 * Routines dealing with vnodes and buffers 1900 */ 1901 1902 /* 1903 * Wait for all outstanding I/Os to complete 1904 * 1905 * Manipulates v_numoutput. Must be called at splbio() 1906 */ 1907 int 1908 vwaitforio(struct vnode *vp, int slpflag, char *wmesg, uint64_t timeo) 1909 { 1910 int error = 0; 1911 1912 splassert(IPL_BIO); 1913 1914 while (vp->v_numoutput) { 1915 vp->v_bioflag |= VBIOWAIT; 1916 error = tsleep_nsec(&vp->v_numoutput, 1917 slpflag | (PRIBIO + 1), wmesg, timeo); 1918 if (error) 1919 break; 1920 } 1921 1922 return (error); 1923 } 1924 1925 /* 1926 * Update outstanding I/O count and do wakeup if requested. 1927 * 1928 * Manipulates v_numoutput. Must be called at splbio() 1929 */ 1930 void 1931 vwakeup(struct vnode *vp) 1932 { 1933 splassert(IPL_BIO); 1934 1935 if (vp != NULL) { 1936 if (vp->v_numoutput-- == 0) 1937 panic("vwakeup: neg numoutput"); 1938 if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) { 1939 vp->v_bioflag &= ~VBIOWAIT; 1940 wakeup(&vp->v_numoutput); 1941 } 1942 } 1943 } 1944 1945 /* 1946 * Flush out and invalidate all buffers associated with a vnode. 1947 * Called with the underlying object locked. 1948 */ 1949 int 1950 vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p, 1951 int slpflag, uint64_t slptimeo) 1952 { 1953 struct buf *bp; 1954 struct buf *nbp, *blist; 1955 int s, error; 1956 1957 #ifdef VFSLCKDEBUG 1958 if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp)) 1959 panic("%s: vp isn't locked, vp %p", __func__, vp); 1960 #endif 1961 1962 if (flags & V_SAVE) { 1963 s = splbio(); 1964 vwaitforio(vp, 0, "vinvalbuf", INFSLP); 1965 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 1966 splx(s); 1967 if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0) 1968 return (error); 1969 s = splbio(); 1970 if (vp->v_numoutput > 0 || 1971 !LIST_EMPTY(&vp->v_dirtyblkhd)) 1972 panic("%s: dirty bufs, vp %p", __func__, vp); 1973 } 1974 splx(s); 1975 } 1976 loop: 1977 s = splbio(); 1978 for (;;) { 1979 int count = 0; 1980 if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) && 1981 (flags & V_SAVEMETA)) 1982 while (blist && blist->b_lblkno < 0) 1983 blist = LIST_NEXT(blist, b_vnbufs); 1984 if (blist == NULL && 1985 (blist = LIST_FIRST(&vp->v_dirtyblkhd)) && 1986 (flags & V_SAVEMETA)) 1987 while (blist && blist->b_lblkno < 0) 1988 blist = LIST_NEXT(blist, b_vnbufs); 1989 if (!blist) 1990 break; 1991 1992 for (bp = blist; bp; bp = nbp) { 1993 nbp = LIST_NEXT(bp, b_vnbufs); 1994 if (flags & V_SAVEMETA && bp->b_lblkno < 0) 1995 continue; 1996 if (bp->b_flags & B_BUSY) { 1997 bp->b_flags |= B_WANTED; 1998 error = tsleep_nsec(bp, slpflag | (PRIBIO + 1), 1999 "vinvalbuf", slptimeo); 2000 if (error) { 2001 splx(s); 2002 return (error); 2003 } 2004 break; 2005 } 2006 bremfree(bp); 2007 /* 2008 * XXX Since there are no node locks for NFS, I believe 2009 * there is a slight chance that a delayed write will 2010 * occur while sleeping just above, so check for it. 2011 */ 2012 if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { 2013 buf_acquire(bp); 2014 splx(s); 2015 (void) VOP_BWRITE(bp); 2016 goto loop; 2017 } 2018 buf_acquire_nomap(bp); 2019 bp->b_flags |= B_INVAL; 2020 brelse(bp); 2021 count++; 2022 /* 2023 * XXX Temporary workaround XXX 2024 * 2025 * If this is a gigantisch vnode and we are 2026 * trashing a ton of buffers, drop the lock 2027 * and yield every so often. The longer term 2028 * fix is to add a separate list for these 2029 * invalid buffers so we don't have to do the 2030 * work to free these here. 2031 */ 2032 if (count > 100) { 2033 splx(s); 2034 sched_pause(yield); 2035 goto loop; 2036 } 2037 } 2038 } 2039 if (!(flags & V_SAVEMETA) && 2040 (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd))) 2041 panic("%s: flush failed, vp %p", __func__, vp); 2042 splx(s); 2043 return (0); 2044 } 2045 2046 void 2047 vflushbuf(struct vnode *vp, int sync) 2048 { 2049 struct buf *bp, *nbp; 2050 int s; 2051 2052 loop: 2053 s = splbio(); 2054 LIST_FOREACH_SAFE(bp, &vp->v_dirtyblkhd, b_vnbufs, nbp) { 2055 if ((bp->b_flags & B_BUSY)) 2056 continue; 2057 if ((bp->b_flags & B_DELWRI) == 0) 2058 panic("vflushbuf: not dirty"); 2059 bremfree(bp); 2060 buf_acquire(bp); 2061 splx(s); 2062 /* 2063 * Wait for I/O associated with indirect blocks to complete, 2064 * since there is no way to quickly wait for them below. 2065 */ 2066 if (bp->b_vp == vp || sync == 0) 2067 (void) bawrite(bp); 2068 else 2069 (void) bwrite(bp); 2070 goto loop; 2071 } 2072 if (sync == 0) { 2073 splx(s); 2074 return; 2075 } 2076 vwaitforio(vp, 0, "vflushbuf", INFSLP); 2077 if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { 2078 splx(s); 2079 #ifdef DIAGNOSTIC 2080 vprint("vflushbuf: dirty", vp); 2081 #endif 2082 goto loop; 2083 } 2084 splx(s); 2085 } 2086 2087 /* 2088 * Associate a buffer with a vnode. 2089 * 2090 * Manipulates buffer vnode queues. Must be called at splbio(). 2091 */ 2092 void 2093 bgetvp(struct vnode *vp, struct buf *bp) 2094 { 2095 splassert(IPL_BIO); 2096 2097 2098 if (bp->b_vp) 2099 panic("bgetvp: not free"); 2100 vhold(vp); 2101 bp->b_vp = vp; 2102 if (vp->v_type == VBLK || vp->v_type == VCHR) 2103 bp->b_dev = vp->v_rdev; 2104 else 2105 bp->b_dev = NODEV; 2106 /* 2107 * Insert onto list for new vnode. 2108 */ 2109 bufinsvn(bp, &vp->v_cleanblkhd); 2110 } 2111 2112 /* 2113 * Disassociate a buffer from a vnode. 2114 * 2115 * Manipulates vnode buffer queues. Must be called at splbio(). 2116 */ 2117 void 2118 brelvp(struct buf *bp) 2119 { 2120 struct vnode *vp; 2121 2122 splassert(IPL_BIO); 2123 2124 if ((vp = bp->b_vp) == (struct vnode *) 0) 2125 panic("brelvp: NULL"); 2126 /* 2127 * Delete from old vnode list, if on one. 2128 */ 2129 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2130 bufremvn(bp); 2131 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2132 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2133 vp->v_bioflag &= ~VBIOONSYNCLIST; 2134 LIST_REMOVE(vp, v_synclist); 2135 } 2136 bp->b_vp = NULL; 2137 2138 vdrop(vp); 2139 } 2140 2141 /* 2142 * Replaces the current vnode associated with the buffer, if any, 2143 * with a new vnode. 2144 * 2145 * If an output I/O is pending on the buffer, the old vnode 2146 * I/O count is adjusted. 2147 * 2148 * Ignores vnode buffer queues. Must be called at splbio(). 2149 */ 2150 void 2151 buf_replacevnode(struct buf *bp, struct vnode *newvp) 2152 { 2153 struct vnode *oldvp = bp->b_vp; 2154 2155 splassert(IPL_BIO); 2156 2157 if (oldvp) 2158 brelvp(bp); 2159 2160 if ((bp->b_flags & (B_READ | B_DONE)) == 0) { 2161 newvp->v_numoutput++; /* put it on swapdev */ 2162 vwakeup(oldvp); 2163 } 2164 2165 bgetvp(newvp, bp); 2166 bufremvn(bp); 2167 } 2168 2169 /* 2170 * Used to assign buffers to the appropriate clean or dirty list on 2171 * the vnode and to add newly dirty vnodes to the appropriate 2172 * filesystem syncer list. 2173 * 2174 * Manipulates vnode buffer queues. Must be called at splbio(). 2175 */ 2176 void 2177 reassignbuf(struct buf *bp) 2178 { 2179 struct buflists *listheadp; 2180 int delay; 2181 struct vnode *vp = bp->b_vp; 2182 2183 splassert(IPL_BIO); 2184 2185 /* 2186 * Delete from old vnode list, if on one. 2187 */ 2188 if (LIST_NEXT(bp, b_vnbufs) != NOLIST) 2189 bufremvn(bp); 2190 2191 /* 2192 * If dirty, put on list of dirty buffers; 2193 * otherwise insert onto list of clean buffers. 2194 */ 2195 if ((bp->b_flags & B_DELWRI) == 0) { 2196 listheadp = &vp->v_cleanblkhd; 2197 if ((vp->v_bioflag & VBIOONSYNCLIST) && 2198 LIST_EMPTY(&vp->v_dirtyblkhd)) { 2199 vp->v_bioflag &= ~VBIOONSYNCLIST; 2200 LIST_REMOVE(vp, v_synclist); 2201 } 2202 } else { 2203 listheadp = &vp->v_dirtyblkhd; 2204 if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) { 2205 switch (vp->v_type) { 2206 case VDIR: 2207 delay = syncdelay / 2; 2208 break; 2209 case VBLK: 2210 if (vp->v_specmountpoint != NULL) { 2211 delay = syncdelay / 3; 2212 break; 2213 } 2214 /* FALLTHROUGH */ 2215 default: 2216 delay = syncdelay; 2217 } 2218 vn_syncer_add_to_worklist(vp, delay); 2219 } 2220 } 2221 bufinsvn(bp, listheadp); 2222 } 2223 2224 /* 2225 * Check if vnode represents a disk device 2226 */ 2227 int 2228 vn_isdisk(struct vnode *vp, int *errp) 2229 { 2230 if (vp->v_type != VBLK && vp->v_type != VCHR) 2231 return (0); 2232 2233 return (1); 2234 } 2235 2236 #ifdef DDB 2237 #include <machine/db_machdep.h> 2238 #include <ddb/db_interface.h> 2239 2240 void 2241 vfs_buf_print(void *b, int full, 2242 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2243 { 2244 struct buf *bp = b; 2245 2246 (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n" 2247 " proc %p error %d flags %lb\n", 2248 bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev, 2249 bp->b_proc, bp->b_error, bp->b_flags, B_BITS); 2250 2251 (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx\n" 2252 " data %p saveaddr %p dep %p iodone %p\n", 2253 bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, 2254 bp->b_data, bp->b_saveaddr, 2255 LIST_FIRST(&bp->b_dep), bp->b_iodone); 2256 2257 (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n", 2258 bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend); 2259 2260 #ifdef FFS_SOFTUPDATES 2261 if (full) 2262 softdep_print(bp, full, pr); 2263 #endif 2264 } 2265 2266 const char *vtypes[] = { VTYPE_NAMES }; 2267 const char *vtags[] = { VTAG_NAMES }; 2268 2269 void 2270 vfs_vnode_print(void *v, int full, 2271 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2272 { 2273 struct vnode *vp = v; 2274 2275 (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n", 2276 (u_int)vp->v_tag >= nitems(vtags)? "<unk>":vtags[vp->v_tag], 2277 vp->v_tag, 2278 (u_int)vp->v_type >= nitems(vtypes)? "<unk>":vtypes[vp->v_type], 2279 vp->v_type, vp->v_mount, vp->v_mountedhere); 2280 2281 (*pr)("data %p usecount %d writecount %d holdcnt %d numoutput %d\n", 2282 vp->v_data, vp->v_usecount, vp->v_writecount, 2283 vp->v_holdcnt, vp->v_numoutput); 2284 2285 /* uvm_object_printit(&vp->v_uobj, full, pr); */ 2286 2287 if (full) { 2288 struct buf *bp; 2289 2290 (*pr)("clean bufs:\n"); 2291 LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) { 2292 (*pr)(" bp %p\n", bp); 2293 vfs_buf_print(bp, full, pr); 2294 } 2295 2296 (*pr)("dirty bufs:\n"); 2297 LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { 2298 (*pr)(" bp %p\n", bp); 2299 vfs_buf_print(bp, full, pr); 2300 } 2301 } 2302 } 2303 2304 void 2305 vfs_mount_print(struct mount *mp, int full, 2306 int (*pr)(const char *, ...) __attribute__((__format__(__kprintf__,1,2)))) 2307 { 2308 struct vfsconf *vfc = mp->mnt_vfc; 2309 struct vnode *vp; 2310 int cnt; 2311 2312 (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n", 2313 mp->mnt_flag, MNT_BITS, 2314 mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data); 2315 2316 (*pr)("vfsconf: ops %p name \"%s\" num %d ref %u flags 0x%x\n", 2317 vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum, 2318 vfc->vfc_refcount, vfc->vfc_flags); 2319 2320 (*pr)("statvfs cache: bsize %x iosize %x\n" 2321 "blocks %llu free %llu avail %lld\n", 2322 mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks, 2323 mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail); 2324 2325 (*pr)(" files %llu ffiles %llu favail %lld\n", mp->mnt_stat.f_files, 2326 mp->mnt_stat.f_ffree, mp->mnt_stat.f_favail); 2327 2328 (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%llx\n", 2329 mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1], 2330 mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime); 2331 2332 (*pr)(" syncwrites %llu asyncwrites = %llu\n", 2333 mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites); 2334 2335 (*pr)(" syncreads %llu asyncreads = %llu\n", 2336 mp->mnt_stat.f_syncreads, mp->mnt_stat.f_asyncreads); 2337 2338 (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\" mntspec \"%s\"\n", 2339 mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname, 2340 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromspec); 2341 2342 (*pr)("locked vnodes:"); 2343 /* XXX would take mountlist lock, except ddb has no context */ 2344 cnt = 0; 2345 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2346 if (VOP_ISLOCKED(vp)) { 2347 if (cnt == 0) 2348 (*pr)("\n %p", vp); 2349 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2350 (*pr)(",\n %p", vp); 2351 else 2352 (*pr)(", %p", vp); 2353 cnt++; 2354 } 2355 } 2356 (*pr)("\n"); 2357 2358 if (full) { 2359 (*pr)("all vnodes:"); 2360 /* XXX would take mountlist lock, except ddb has no context */ 2361 cnt = 0; 2362 TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { 2363 if (cnt == 0) 2364 (*pr)("\n %p", vp); 2365 else if ((cnt % (72 / (sizeof(void *) * 2 + 4))) == 0) 2366 (*pr)(",\n %p", vp); 2367 else 2368 (*pr)(", %p", vp); 2369 cnt++; 2370 } 2371 (*pr)("\n"); 2372 } 2373 } 2374 #endif /* DDB */ 2375 2376 void 2377 copy_statfs_info(struct statfs *sbp, const struct mount *mp) 2378 { 2379 const struct statfs *mbp; 2380 2381 strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); 2382 2383 if (sbp == (mbp = &mp->mnt_stat)) 2384 return; 2385 2386 sbp->f_fsid = mbp->f_fsid; 2387 sbp->f_owner = mbp->f_owner; 2388 sbp->f_flags = mbp->f_flags; 2389 sbp->f_syncwrites = mbp->f_syncwrites; 2390 sbp->f_asyncwrites = mbp->f_asyncwrites; 2391 sbp->f_syncreads = mbp->f_syncreads; 2392 sbp->f_asyncreads = mbp->f_asyncreads; 2393 sbp->f_namemax = mbp->f_namemax; 2394 memcpy(sbp->f_mntonname, mp->mnt_stat.f_mntonname, MNAMELEN); 2395 memcpy(sbp->f_mntfromname, mp->mnt_stat.f_mntfromname, MNAMELEN); 2396 memcpy(sbp->f_mntfromspec, mp->mnt_stat.f_mntfromspec, MNAMELEN); 2397 memcpy(&sbp->mount_info, &mp->mnt_stat.mount_info, 2398 sizeof(union mount_info)); 2399 }
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