1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95 35 */ 36 37 /* 38 * External virtual filesystem routines 39 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include "opt_compat.h" 45 #include "opt_ddb.h" 46 #include "opt_watchdog.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/condvar.h> 53 #include <sys/conf.h> 54 #include <sys/dirent.h> 55 #include <sys/event.h> 56 #include <sys/eventhandler.h> 57 #include <sys/extattr.h> 58 #include <sys/file.h> 59 #include <sys/fcntl.h> 60 #include <sys/jail.h> 61 #include <sys/kdb.h> 62 #include <sys/kernel.h> 63 #include <sys/kthread.h> 64 #include <sys/lockf.h> 65 #include <sys/malloc.h> 66 #include <sys/mount.h> 67 #include <sys/namei.h> 68 #include <sys/pctrie.h> 69 #include <sys/priv.h> 70 #include <sys/reboot.h> 71 #include <sys/rwlock.h> 72 #include <sys/sched.h> 73 #include <sys/sleepqueue.h> 74 #include <sys/smp.h> 75 #include <sys/stat.h> 76 #include <sys/sysctl.h> 77 #include <sys/syslog.h> 78 #include <sys/vmmeter.h> 79 #include <sys/vnode.h> 80 #include <sys/watchdog.h> 81 82 #include <machine/stdarg.h> 83 84 #include <security/mac/mac_framework.h> 85 86 #include <vm/vm.h> 87 #include <vm/vm_object.h> 88 #include <vm/vm_extern.h> 89 #include <vm/pmap.h> 90 #include <vm/vm_map.h> 91 #include <vm/vm_page.h> 92 #include <vm/vm_kern.h> 93 #include <vm/uma.h> 94 95 #ifdef DDB 96 #include <ddb/ddb.h> 97 #endif 98 99 static void delmntque(struct vnode *vp); 100 static int flushbuflist(struct bufv *bufv, int flags, struct bufobj *bo, 101 int slpflag, int slptimeo); 102 static void syncer_shutdown(void *arg, int howto); 103 static int vtryrecycle(struct vnode *vp); 104 static void v_incr_usecount(struct vnode *); 105 static void v_decr_usecount(struct vnode *); 106 static void v_decr_useonly(struct vnode *); 107 static void v_upgrade_usecount(struct vnode *); 108 static void vnlru_free(int); 109 static void vgonel(struct vnode *); 110 static void vfs_knllock(void *arg); 111 static void vfs_knlunlock(void *arg); 112 static void vfs_knl_assert_locked(void *arg); 113 static void vfs_knl_assert_unlocked(void *arg); 114 static void destroy_vpollinfo(struct vpollinfo *vi); 115 116 /* 117 * Number of vnodes in existence. Increased whenever getnewvnode() 118 * allocates a new vnode, decreased in vdropl() for VI_DOOMED vnode. 119 */ 120 static unsigned long numvnodes; 121 122 SYSCTL_ULONG(_vfs, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, 123 "Number of vnodes in existence"); 124 125 static u_long vnodes_created; 126 SYSCTL_ULONG(_vfs, OID_AUTO, vnodes_created, CTLFLAG_RD, &vnodes_created, 127 0, "Number of vnodes created by getnewvnode"); 128 129 /* 130 * Conversion tables for conversion from vnode types to inode formats 131 * and back. 132 */ 133 enum vtype iftovt_tab[16] = { 134 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 135 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 136 }; 137 int vttoif_tab[10] = { 138 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 139 S_IFSOCK, S_IFIFO, S_IFMT, S_IFMT 140 }; 141 142 /* 143 * List of vnodes that are ready for recycling. 144 */ 145 static TAILQ_HEAD(freelst, vnode) vnode_free_list; 146 147 /* 148 * Free vnode target. Free vnodes may simply be files which have been stat'd 149 * but not read. This is somewhat common, and a small cache of such files 150 * should be kept to avoid recreation costs. 151 */ 152 static u_long wantfreevnodes; 153 SYSCTL_ULONG(_vfs, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, ""); 154 /* Number of vnodes in the free list. */ 155 static u_long freevnodes; 156 SYSCTL_ULONG(_vfs, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, 157 "Number of vnodes in the free list"); 158 159 static int vlru_allow_cache_src; 160 SYSCTL_INT(_vfs, OID_AUTO, vlru_allow_cache_src, CTLFLAG_RW, 161 &vlru_allow_cache_src, 0, "Allow vlru to reclaim source vnode"); 162 163 static u_long recycles_count; 164 SYSCTL_ULONG(_vfs, OID_AUTO, recycles, CTLFLAG_RD, &recycles_count, 0, 165 "Number of vnodes recycled to avoid exceding kern.maxvnodes"); 166 167 /* 168 * Various variables used for debugging the new implementation of 169 * reassignbuf(). 170 * XXX these are probably of (very) limited utility now. 171 */ 172 static int reassignbufcalls; 173 SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, 174 "Number of calls to reassignbuf"); 175 176 /* 177 * Cache for the mount type id assigned to NFS. This is used for 178 * special checks in nfs/nfs_nqlease.c and vm/vnode_pager.c. 179 */ 180 int nfs_mount_type = -1; 181 182 /* To keep more than one thread at a time from running vfs_getnewfsid */ 183 static struct mtx mntid_mtx; 184 185 /* 186 * Lock for any access to the following: 187 * vnode_free_list 188 * numvnodes 189 * freevnodes 190 */ 191 static struct mtx vnode_free_list_mtx; 192 193 /* Publicly exported FS */ 194 struct nfs_public nfs_pub; 195 196 static uma_zone_t buf_trie_zone; 197 198 /* Zone for allocation of new vnodes - used exclusively by getnewvnode() */ 199 static uma_zone_t vnode_zone; 200 static uma_zone_t vnodepoll_zone; 201 202 /* 203 * The workitem queue. 204 * 205 * It is useful to delay writes of file data and filesystem metadata 206 * for tens of seconds so that quickly created and deleted files need 207 * not waste disk bandwidth being created and removed. To realize this, 208 * we append vnodes to a "workitem" queue. When running with a soft 209 * updates implementation, most pending metadata dependencies should 210 * not wait for more than a few seconds. Thus, mounted on block devices 211 * are delayed only about a half the time that file data is delayed. 212 * Similarly, directory updates are more critical, so are only delayed 213 * about a third the time that file data is delayed. Thus, there are 214 * SYNCER_MAXDELAY queues that are processed round-robin at a rate of 215 * one each second (driven off the filesystem syncer process). The 216 * syncer_delayno variable indicates the next queue that is to be processed. 217 * Items that need to be processed soon are placed in this queue: 218 * 219 * syncer_workitem_pending[syncer_delayno] 220 * 221 * A delay of fifteen seconds is done by placing the request fifteen 222 * entries later in the queue: 223 * 224 * syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask] 225 * 226 */ 227 static int syncer_delayno; 228 static long syncer_mask; 229 LIST_HEAD(synclist, bufobj); 230 static struct synclist *syncer_workitem_pending; 231 /* 232 * The sync_mtx protects: 233 * bo->bo_synclist 234 * sync_vnode_count 235 * syncer_delayno 236 * syncer_state 237 * syncer_workitem_pending 238 * syncer_worklist_len 239 * rushjob 240 */ 241 static struct mtx sync_mtx; 242 static struct cv sync_wakeup; 243 244 #define SYNCER_MAXDELAY 32 245 static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */ 246 static int syncdelay = 30; /* max time to delay syncing data */ 247 static int filedelay = 30; /* time to delay syncing files */ 248 SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, &filedelay, 0, 249 "Time to delay syncing files (in seconds)"); 250 static int dirdelay = 29; /* time to delay syncing directories */ 251 SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, &dirdelay, 0, 252 "Time to delay syncing directories (in seconds)"); 253 static int metadelay = 28; /* time to delay syncing metadata */ 254 SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, &metadelay, 0, 255 "Time to delay syncing metadata (in seconds)"); 256 static int rushjob; /* number of slots to run ASAP */ 257 static int stat_rush_requests; /* number of times I/O speeded up */ 258 SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, &stat_rush_requests, 0, 259 "Number of times I/O speeded up (rush requests)"); 260 261 /* 262 * When shutting down the syncer, run it at four times normal speed. 263 */ 264 #define SYNCER_SHUTDOWN_SPEEDUP 4 265 static int sync_vnode_count; 266 static int syncer_worklist_len; 267 static enum { SYNCER_RUNNING, SYNCER_SHUTTING_DOWN, SYNCER_FINAL_DELAY } 268 syncer_state; 269 270 /* 271 * Number of vnodes we want to exist at any one time. This is mostly used 272 * to size hash tables in vnode-related code. It is normally not used in 273 * getnewvnode(), as wantfreevnodes is normally nonzero.) 274 * 275 * XXX desiredvnodes is historical cruft and should not exist. 276 */ 277 int desiredvnodes; 278 SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, 279 &desiredvnodes, 0, "Maximum number of vnodes"); 280 SYSCTL_ULONG(_kern, OID_AUTO, minvnodes, CTLFLAG_RW, 281 &wantfreevnodes, 0, "Minimum number of vnodes (legacy)"); 282 static int vnlru_nowhere; 283 SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW, 284 &vnlru_nowhere, 0, "Number of times the vnlru process ran without success"); 285 286 /* Shift count for (uintptr_t)vp to initialize vp->v_hash. */ 287 static int vnsz2log; 288 289 /* 290 * Support for the bufobj clean & dirty pctrie. 291 */ 292 static void * 293 buf_trie_alloc(struct pctrie *ptree) 294 { 295 296 return uma_zalloc(buf_trie_zone, M_NOWAIT); 297 } 298 299 static void 300 buf_trie_free(struct pctrie *ptree, void *node) 301 { 302 303 uma_zfree(buf_trie_zone, node); 304 } 305 PCTRIE_DEFINE(BUF, buf, b_lblkno, buf_trie_alloc, buf_trie_free); 306 307 /* 308 * Initialize the vnode management data structures. 309 * 310 * Reevaluate the following cap on the number of vnodes after the physical 311 * memory size exceeds 512GB. In the limit, as the physical memory size 312 * grows, the ratio of physical pages to vnodes approaches sixteen to one. 313 */ 314 #ifndef MAXVNODES_MAX 315 #define MAXVNODES_MAX (512 * (1024 * 1024 * 1024 / (int)PAGE_SIZE / 16)) 316 #endif 317 static void 318 vntblinit(void *dummy __unused) 319 { 320 u_int i; 321 int physvnodes, virtvnodes; 322 323 /* 324 * Desiredvnodes is a function of the physical memory size and the 325 * kernel's heap size. Generally speaking, it scales with the 326 * physical memory size. The ratio of desiredvnodes to physical pages 327 * is one to four until desiredvnodes exceeds 98,304. Thereafter, the 328 * marginal ratio of desiredvnodes to physical pages is one to 329 * sixteen. However, desiredvnodes is limited by the kernel's heap 330 * size. The memory required by desiredvnodes vnodes and vm objects 331 * may not exceed one seventh of the kernel's heap size. 332 */ 333 physvnodes = maxproc + vm_cnt.v_page_count / 16 + 3 * min(98304 * 4, 334 vm_cnt.v_page_count) / 16; 335 virtvnodes = vm_kmem_size / (7 * (sizeof(struct vm_object) + 336 sizeof(struct vnode))); 337 desiredvnodes = min(physvnodes, virtvnodes); 338 if (desiredvnodes > MAXVNODES_MAX) { 339 if (bootverbose) 340 printf("Reducing kern.maxvnodes %d -> %d\n", 341 desiredvnodes, MAXVNODES_MAX); 342 desiredvnodes = MAXVNODES_MAX; 343 } 344 wantfreevnodes = desiredvnodes / 4; 345 mtx_init(&mntid_mtx, "mntid", NULL, MTX_DEF); 346 TAILQ_INIT(&vnode_free_list); 347 mtx_init(&vnode_free_list_mtx, "vnode_free_list", NULL, MTX_DEF); 348 vnode_zone = uma_zcreate("VNODE", sizeof (struct vnode), NULL, NULL, 349 NULL, NULL, UMA_ALIGN_PTR, 0); 350 vnodepoll_zone = uma_zcreate("VNODEPOLL", sizeof (struct vpollinfo), 351 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 352 /* 353 * Preallocate enough nodes to support one-per buf so that 354 * we can not fail an insert. reassignbuf() callers can not 355 * tolerate the insertion failure. 356 */ 357 buf_trie_zone = uma_zcreate("BUF TRIE", pctrie_node_size(), 358 NULL, NULL, pctrie_zone_init, NULL, UMA_ALIGN_PTR, 359 UMA_ZONE_NOFREE | UMA_ZONE_VM); 360 uma_prealloc(buf_trie_zone, nbuf); 361 /* 362 * Initialize the filesystem syncer. 363 */ 364 syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE, 365 &syncer_mask); 366 syncer_maxdelay = syncer_mask + 1; 367 mtx_init(&sync_mtx, "Syncer mtx", NULL, MTX_DEF); 368 cv_init(&sync_wakeup, "syncer"); 369 for (i = 1; i <= sizeof(struct vnode); i <<= 1) 370 vnsz2log++; 371 vnsz2log--; 372 } 373 SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_FIRST, vntblinit, NULL); 374 375 376 /* 377 * Mark a mount point as busy. Used to synchronize access and to delay 378 * unmounting. Eventually, mountlist_mtx is not released on failure. 379 * 380 * vfs_busy() is a custom lock, it can block the caller. 381 * vfs_busy() only sleeps if the unmount is active on the mount point. 382 * For a mountpoint mp, vfs_busy-enforced lock is before lock of any 383 * vnode belonging to mp. 384 * 385 * Lookup uses vfs_busy() to traverse mount points. 386 * root fs var fs 387 * / vnode lock A / vnode lock (/var) D 388 * /var vnode lock B /log vnode lock(/var/log) E 389 * vfs_busy lock C vfs_busy lock F 390 * 391 * Within each file system, the lock order is C->A->B and F->D->E. 392 * 393 * When traversing across mounts, the system follows that lock order: 394 * 395 * C->A->B 396 * | 397 * +->F->D->E 398 * 399 * The lookup() process for namei("/var") illustrates the process: 400 * VOP_LOOKUP() obtains B while A is held 401 * vfs_busy() obtains a shared lock on F while A and B are held 402 * vput() releases lock on B 403 * vput() releases lock on A 404 * VFS_ROOT() obtains lock on D while shared lock on F is held 405 * vfs_unbusy() releases shared lock on F 406 * vn_lock() obtains lock on deadfs vnode vp_crossmp instead of A. 407 * Attempt to lock A (instead of vp_crossmp) while D is held would 408 * violate the global order, causing deadlocks. 409 * 410 * dounmount() locks B while F is drained. 411 */ 412 int 413 vfs_busy(struct mount *mp, int flags) 414 { 415 416 MPASS((flags & ~MBF_MASK) == 0); 417 CTR3(KTR_VFS, "%s: mp %p with flags %d", __func__, mp, flags); 418 419 MNT_ILOCK(mp); 420 MNT_REF(mp); 421 /* 422 * If mount point is currenly being unmounted, sleep until the 423 * mount point fate is decided. If thread doing the unmounting fails, 424 * it will clear MNTK_UNMOUNT flag before waking us up, indicating 425 * that this mount point has survived the unmount attempt and vfs_busy 426 * should retry. Otherwise the unmounter thread will set MNTK_REFEXPIRE 427 * flag in addition to MNTK_UNMOUNT, indicating that mount point is 428 * about to be really destroyed. vfs_busy needs to release its 429 * reference on the mount point in this case and return with ENOENT, 430 * telling the caller that mount mount it tried to busy is no longer 431 * valid. 432 */ 433 while (mp->mnt_kern_flag & MNTK_UNMOUNT) { 434 if (flags & MBF_NOWAIT || mp->mnt_kern_flag & MNTK_REFEXPIRE) { 435 MNT_REL(mp); 436 MNT_IUNLOCK(mp); 437 CTR1(KTR_VFS, "%s: failed busying before sleeping", 438 __func__); 439 return (ENOENT); 440 } 441 if (flags & MBF_MNTLSTLOCK) 442 mtx_unlock(&mountlist_mtx); 443 mp->mnt_kern_flag |= MNTK_MWAIT; 444 msleep(mp, MNT_MTX(mp), PVFS | PDROP, "vfs_busy", 0); 445 if (flags & MBF_MNTLSTLOCK) 446 mtx_lock(&mountlist_mtx); 447 MNT_ILOCK(mp); 448 } 449 if (flags & MBF_MNTLSTLOCK) 450 mtx_unlock(&mountlist_mtx); 451 mp->mnt_lockref++; 452 MNT_IUNLOCK(mp); 453 return (0); 454 } 455 456 /* 457 * Free a busy filesystem. 458 */ 459 void 460 vfs_unbusy(struct mount *mp) 461 { 462 463 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 464 MNT_ILOCK(mp); 465 MNT_REL(mp); 466 KASSERT(mp->mnt_lockref > 0, ("negative mnt_lockref")); 467 mp->mnt_lockref--; 468 if (mp->mnt_lockref == 0 && (mp->mnt_kern_flag & MNTK_DRAINING) != 0) { 469 MPASS(mp->mnt_kern_flag & MNTK_UNMOUNT); 470 CTR1(KTR_VFS, "%s: waking up waiters", __func__); 471 mp->mnt_kern_flag &= ~MNTK_DRAINING; 472 wakeup(&mp->mnt_lockref); 473 } 474 MNT_IUNLOCK(mp); 475 } 476 477 /* 478 * Lookup a mount point by filesystem identifier. 479 */ 480 struct mount * 481 vfs_getvfs(fsid_t *fsid) 482 { 483 struct mount *mp; 484 485 CTR2(KTR_VFS, "%s: fsid %p", __func__, fsid); 486 mtx_lock(&mountlist_mtx); 487 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 488 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 489 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 490 vfs_ref(mp); 491 mtx_unlock(&mountlist_mtx); 492 return (mp); 493 } 494 } 495 mtx_unlock(&mountlist_mtx); 496 CTR2(KTR_VFS, "%s: lookup failed for %p id", __func__, fsid); 497 return ((struct mount *) 0); 498 } 499 500 /* 501 * Lookup a mount point by filesystem identifier, busying it before 502 * returning. 503 * 504 * To avoid congestion on mountlist_mtx, implement simple direct-mapped 505 * cache for popular filesystem identifiers. The cache is lockess, using 506 * the fact that struct mount's are never freed. In worst case we may 507 * get pointer to unmounted or even different filesystem, so we have to 508 * check what we got, and go slow way if so. 509 */ 510 struct mount * 511 vfs_busyfs(fsid_t *fsid) 512 { 513 #define FSID_CACHE_SIZE 256 514 typedef struct mount * volatile vmp_t; 515 static vmp_t cache[FSID_CACHE_SIZE]; 516 struct mount *mp; 517 int error; 518 uint32_t hash; 519 520 CTR2(KTR_VFS, "%s: fsid %p", __func__, fsid); 521 hash = fsid->val[0] ^ fsid->val[1]; 522 hash = (hash >> 16 ^ hash) & (FSID_CACHE_SIZE - 1); 523 mp = cache[hash]; 524 if (mp == NULL || 525 mp->mnt_stat.f_fsid.val[0] != fsid->val[0] || 526 mp->mnt_stat.f_fsid.val[1] != fsid->val[1]) 527 goto slow; 528 if (vfs_busy(mp, 0) != 0) { 529 cache[hash] = NULL; 530 goto slow; 531 } 532 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 533 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) 534 return (mp); 535 else 536 vfs_unbusy(mp); 537 538 slow: 539 mtx_lock(&mountlist_mtx); 540 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 541 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 542 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 543 error = vfs_busy(mp, MBF_MNTLSTLOCK); 544 if (error) { 545 cache[hash] = NULL; 546 mtx_unlock(&mountlist_mtx); 547 return (NULL); 548 } 549 cache[hash] = mp; 550 return (mp); 551 } 552 } 553 CTR2(KTR_VFS, "%s: lookup failed for %p id", __func__, fsid); 554 mtx_unlock(&mountlist_mtx); 555 return ((struct mount *) 0); 556 } 557 558 /* 559 * Check if a user can access privileged mount options. 560 */ 561 int 562 vfs_suser(struct mount *mp, struct thread *td) 563 { 564 int error; 565 566 /* 567 * If the thread is jailed, but this is not a jail-friendly file 568 * system, deny immediately. 569 */ 570 if (!(mp->mnt_vfc->vfc_flags & VFCF_JAIL) && jailed(td->td_ucred)) 571 return (EPERM); 572 573 /* 574 * If the file system was mounted outside the jail of the calling 575 * thread, deny immediately. 576 */ 577 if (prison_check(td->td_ucred, mp->mnt_cred) != 0) 578 return (EPERM); 579 580 /* 581 * If file system supports delegated administration, we don't check 582 * for the PRIV_VFS_MOUNT_OWNER privilege - it will be better verified 583 * by the file system itself. 584 * If this is not the user that did original mount, we check for 585 * the PRIV_VFS_MOUNT_OWNER privilege. 586 */ 587 if (!(mp->mnt_vfc->vfc_flags & VFCF_DELEGADMIN) && 588 mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) { 589 if ((error = priv_check(td, PRIV_VFS_MOUNT_OWNER)) != 0) 590 return (error); 591 } 592 return (0); 593 } 594 595 /* 596 * Get a new unique fsid. Try to make its val[0] unique, since this value 597 * will be used to create fake device numbers for stat(). Also try (but 598 * not so hard) make its val[0] unique mod 2^16, since some emulators only 599 * support 16-bit device numbers. We end up with unique val[0]'s for the 600 * first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls. 601 * 602 * Keep in mind that several mounts may be running in parallel. Starting 603 * the search one past where the previous search terminated is both a 604 * micro-optimization and a defense against returning the same fsid to 605 * different mounts. 606 */ 607 void 608 vfs_getnewfsid(struct mount *mp) 609 { 610 static uint16_t mntid_base; 611 struct mount *nmp; 612 fsid_t tfsid; 613 int mtype; 614 615 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 616 mtx_lock(&mntid_mtx); 617 mtype = mp->mnt_vfc->vfc_typenum; 618 tfsid.val[1] = mtype; 619 mtype = (mtype & 0xFF) << 24; 620 for (;;) { 621 tfsid.val[0] = makedev(255, 622 mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF)); 623 mntid_base++; 624 if ((nmp = vfs_getvfs(&tfsid)) == NULL) 625 break; 626 vfs_rel(nmp); 627 } 628 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 629 mp->mnt_stat.f_fsid.val[1] = tfsid.val[1]; 630 mtx_unlock(&mntid_mtx); 631 } 632 633 /* 634 * Knob to control the precision of file timestamps: 635 * 636 * 0 = seconds only; nanoseconds zeroed. 637 * 1 = seconds and nanoseconds, accurate within 1/HZ. 638 * 2 = seconds and nanoseconds, truncated to microseconds. 639 * >=3 = seconds and nanoseconds, maximum precision. 640 */ 641 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; 642 643 static int timestamp_precision = TSP_USEC; 644 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, 645 ×tamp_precision, 0, "File timestamp precision (0: seconds, " 646 "1: sec + ns accurate to 1/HZ, 2: sec + ns truncated to ms, " 647 "3+: sec + ns (max. precision))"); 648 649 /* 650 * Get a current timestamp. 651 */ 652 void 653 vfs_timestamp(struct timespec *tsp) 654 { 655 struct timeval tv; 656 657 switch (timestamp_precision) { 658 case TSP_SEC: 659 tsp->tv_sec = time_second; 660 tsp->tv_nsec = 0; 661 break; 662 case TSP_HZ: 663 getnanotime(tsp); 664 break; 665 case TSP_USEC: 666 microtime(&tv); 667 TIMEVAL_TO_TIMESPEC(&tv, tsp); 668 break; 669 case TSP_NSEC: 670 default: 671 nanotime(tsp); 672 break; 673 } 674 } 675 676 /* 677 * Set vnode attributes to VNOVAL 678 */ 679 void 680 vattr_null(struct vattr *vap) 681 { 682 683 vap->va_type = VNON; 684 vap->va_size = VNOVAL; 685 vap->va_bytes = VNOVAL; 686 vap->va_mode = VNOVAL; 687 vap->va_nlink = VNOVAL; 688 vap->va_uid = VNOVAL; 689 vap->va_gid = VNOVAL; 690 vap->va_fsid = VNOVAL; 691 vap->va_fileid = VNOVAL; 692 vap->va_blocksize = VNOVAL; 693 vap->va_rdev = VNOVAL; 694 vap->va_atime.tv_sec = VNOVAL; 695 vap->va_atime.tv_nsec = VNOVAL; 696 vap->va_mtime.tv_sec = VNOVAL; 697 vap->va_mtime.tv_nsec = VNOVAL; 698 vap->va_ctime.tv_sec = VNOVAL; 699 vap->va_ctime.tv_nsec = VNOVAL; 700 vap->va_birthtime.tv_sec = VNOVAL; 701 vap->va_birthtime.tv_nsec = VNOVAL; 702 vap->va_flags = VNOVAL; 703 vap->va_gen = VNOVAL; 704 vap->va_vaflags = 0; 705 } 706 707 /* 708 * This routine is called when we have too many vnodes. It attempts 709 * to free <count> vnodes and will potentially free vnodes that still 710 * have VM backing store (VM backing store is typically the cause 711 * of a vnode blowout so we want to do this). Therefore, this operation 712 * is not considered cheap. 713 * 714 * A number of conditions may prevent a vnode from being reclaimed. 715 * the buffer cache may have references on the vnode, a directory 716 * vnode may still have references due to the namei cache representing 717 * underlying files, or the vnode may be in active use. It is not 718 * desireable to reuse such vnodes. These conditions may cause the 719 * number of vnodes to reach some minimum value regardless of what 720 * you set kern.maxvnodes to. Do not set kern.maxvnodes too low. 721 */ 722 static int 723 vlrureclaim(struct mount *mp) 724 { 725 struct vnode *vp; 726 int done; 727 int trigger; 728 int usevnodes; 729 int count; 730 731 /* 732 * Calculate the trigger point, don't allow user 733 * screwups to blow us up. This prevents us from 734 * recycling vnodes with lots of resident pages. We 735 * aren't trying to free memory, we are trying to 736 * free vnodes. 737 */ 738 usevnodes = desiredvnodes; 739 if (usevnodes <= 0) 740 usevnodes = 1; 741 trigger = vm_cnt.v_page_count * 2 / usevnodes; 742 done = 0; 743 vn_start_write(NULL, &mp, V_WAIT); 744 MNT_ILOCK(mp); 745 count = mp->mnt_nvnodelistsize / 10 + 1; 746 while (count != 0) { 747 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 748 while (vp != NULL && vp->v_type == VMARKER) 749 vp = TAILQ_NEXT(vp, v_nmntvnodes); 750 if (vp == NULL) 751 break; 752 TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 753 TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 754 --count; 755 if (!VI_TRYLOCK(vp)) 756 goto next_iter; 757 /* 758 * If it's been deconstructed already, it's still 759 * referenced, or it exceeds the trigger, skip it. 760 */ 761 if (vp->v_usecount || 762 (!vlru_allow_cache_src && 763 !LIST_EMPTY(&(vp)->v_cache_src)) || 764 (vp->v_iflag & VI_DOOMED) != 0 || (vp->v_object != NULL && 765 vp->v_object->resident_page_count > trigger)) { 766 VI_UNLOCK(vp); 767 goto next_iter; 768 } 769 MNT_IUNLOCK(mp); 770 vholdl(vp); 771 if (VOP_LOCK(vp, LK_INTERLOCK|LK_EXCLUSIVE|LK_NOWAIT)) { 772 vdrop(vp); 773 goto next_iter_mntunlocked; 774 } 775 VI_LOCK(vp); 776 /* 777 * v_usecount may have been bumped after VOP_LOCK() dropped 778 * the vnode interlock and before it was locked again. 779 * 780 * It is not necessary to recheck VI_DOOMED because it can 781 * only be set by another thread that holds both the vnode 782 * lock and vnode interlock. If another thread has the 783 * vnode lock before we get to VOP_LOCK() and obtains the 784 * vnode interlock after VOP_LOCK() drops the vnode 785 * interlock, the other thread will be unable to drop the 786 * vnode lock before our VOP_LOCK() call fails. 787 */ 788 if (vp->v_usecount || 789 (!vlru_allow_cache_src && 790 !LIST_EMPTY(&(vp)->v_cache_src)) || 791 (vp->v_object != NULL && 792 vp->v_object->resident_page_count > trigger)) { 793 VOP_UNLOCK(vp, LK_INTERLOCK); 794 vdrop(vp); 795 goto next_iter_mntunlocked; 796 } 797 KASSERT((vp->v_iflag & VI_DOOMED) == 0, 798 ("VI_DOOMED unexpectedly detected in vlrureclaim()")); 799 atomic_add_long(&recycles_count, 1); 800 vgonel(vp); 801 VOP_UNLOCK(vp, 0); 802 vdropl(vp); 803 done++; 804 next_iter_mntunlocked: 805 if (!should_yield()) 806 goto relock_mnt; 807 goto yield; 808 next_iter: 809 if (!should_yield()) 810 continue; 811 MNT_IUNLOCK(mp); 812 yield: 813 kern_yield(PRI_USER); 814 relock_mnt: 815 MNT_ILOCK(mp); 816 } 817 MNT_IUNLOCK(mp); 818 vn_finished_write(mp); 819 return done; 820 } 821 822 /* 823 * Attempt to keep the free list at wantfreevnodes length. 824 */ 825 static void 826 vnlru_free(int count) 827 { 828 struct vnode *vp; 829 830 mtx_assert(&vnode_free_list_mtx, MA_OWNED); 831 for (; count > 0; count--) { 832 vp = TAILQ_FIRST(&vnode_free_list); 833 /* 834 * The list can be modified while the free_list_mtx 835 * has been dropped and vp could be NULL here. 836 */ 837 if (!vp) 838 break; 839 VNASSERT(vp->v_op != NULL, vp, 840 ("vnlru_free: vnode already reclaimed.")); 841 KASSERT((vp->v_iflag & VI_FREE) != 0, 842 ("Removing vnode not on freelist")); 843 KASSERT((vp->v_iflag & VI_ACTIVE) == 0, 844 ("Mangling active vnode")); 845 TAILQ_REMOVE(&vnode_free_list, vp, v_actfreelist); 846 /* 847 * Don't recycle if we can't get the interlock. 848 */ 849 if (!VI_TRYLOCK(vp)) { 850 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_actfreelist); 851 continue; 852 } 853 VNASSERT((vp->v_iflag & VI_FREE) != 0 && vp->v_holdcnt == 0, 854 vp, ("vp inconsistent on freelist")); 855 856 /* 857 * The clear of VI_FREE prevents activation of the 858 * vnode. There is no sense in putting the vnode on 859 * the mount point active list, only to remove it 860 * later during recycling. Inline the relevant part 861 * of vholdl(), to avoid triggering assertions or 862 * activating. 863 */ 864 freevnodes--; 865 vp->v_iflag &= ~VI_FREE; 866 vp->v_holdcnt++; 867 868 mtx_unlock(&vnode_free_list_mtx); 869 VI_UNLOCK(vp); 870 vtryrecycle(vp); 871 /* 872 * If the recycled succeeded this vdrop will actually free 873 * the vnode. If not it will simply place it back on 874 * the free list. 875 */ 876 vdrop(vp); 877 mtx_lock(&vnode_free_list_mtx); 878 } 879 } 880 /* 881 * Attempt to recycle vnodes in a context that is always safe to block. 882 * Calling vlrurecycle() from the bowels of filesystem code has some 883 * interesting deadlock problems. 884 */ 885 static struct proc *vnlruproc; 886 static int vnlruproc_sig; 887 888 static void 889 vnlru_proc(void) 890 { 891 struct mount *mp, *nmp; 892 int done; 893 struct proc *p = vnlruproc; 894 895 EVENTHANDLER_REGISTER(shutdown_pre_sync, kproc_shutdown, p, 896 SHUTDOWN_PRI_FIRST); 897 898 for (;;) { 899 kproc_suspend_check(p); 900 mtx_lock(&vnode_free_list_mtx); 901 if (freevnodes > wantfreevnodes) 902 vnlru_free(freevnodes - wantfreevnodes); 903 if (numvnodes <= desiredvnodes * 9 / 10) { 904 vnlruproc_sig = 0; 905 wakeup(&vnlruproc_sig); 906 msleep(vnlruproc, &vnode_free_list_mtx, 907 PVFS|PDROP, "vlruwt", hz); 908 continue; 909 } 910 mtx_unlock(&vnode_free_list_mtx); 911 done = 0; 912 mtx_lock(&mountlist_mtx); 913 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 914 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) { 915 nmp = TAILQ_NEXT(mp, mnt_list); 916 continue; 917 } 918 done += vlrureclaim(mp); 919 mtx_lock(&mountlist_mtx); 920 nmp = TAILQ_NEXT(mp, mnt_list); 921 vfs_unbusy(mp); 922 } 923 mtx_unlock(&mountlist_mtx); 924 if (done == 0) { 925 #if 0 926 /* These messages are temporary debugging aids */ 927 if (vnlru_nowhere < 5) 928 printf("vnlru process getting nowhere..\n"); 929 else if (vnlru_nowhere == 5) 930 printf("vnlru process messages stopped.\n"); 931 #endif 932 vnlru_nowhere++; 933 tsleep(vnlruproc, PPAUSE, "vlrup", hz * 3); 934 } else 935 kern_yield(PRI_USER); 936 } 937 } 938 939 static struct kproc_desc vnlru_kp = { 940 "vnlru", 941 vnlru_proc, 942 &vnlruproc 943 }; 944 SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, 945 &vnlru_kp); 946 947 /* 948 * Routines having to do with the management of the vnode table. 949 */ 950 951 /* 952 * Try to recycle a freed vnode. We abort if anyone picks up a reference 953 * before we actually vgone(). This function must be called with the vnode 954 * held to prevent the vnode from being returned to the free list midway 955 * through vgone(). 956 */ 957 static int 958 vtryrecycle(struct vnode *vp) 959 { 960 struct mount *vnmp; 961 962 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 963 VNASSERT(vp->v_holdcnt, vp, 964 ("vtryrecycle: Recycling vp %p without a reference.", vp)); 965 /* 966 * This vnode may found and locked via some other list, if so we 967 * can't recycle it yet. 968 */ 969 if (VOP_LOCK(vp, LK_EXCLUSIVE | LK_NOWAIT) != 0) { 970 CTR2(KTR_VFS, 971 "%s: impossible to recycle, vp %p lock is already held", 972 __func__, vp); 973 return (EWOULDBLOCK); 974 } 975 /* 976 * Don't recycle if its filesystem is being suspended. 977 */ 978 if (vn_start_write(vp, &vnmp, V_NOWAIT) != 0) { 979 VOP_UNLOCK(vp, 0); 980 CTR2(KTR_VFS, 981 "%s: impossible to recycle, cannot start the write for %p", 982 __func__, vp); 983 return (EBUSY); 984 } 985 /* 986 * If we got this far, we need to acquire the interlock and see if 987 * anyone picked up this vnode from another list. If not, we will 988 * mark it with DOOMED via vgonel() so that anyone who does find it 989 * will skip over it. 990 */ 991 VI_LOCK(vp); 992 if (vp->v_usecount) { 993 VOP_UNLOCK(vp, LK_INTERLOCK); 994 vn_finished_write(vnmp); 995 CTR2(KTR_VFS, 996 "%s: impossible to recycle, %p is already referenced", 997 __func__, vp); 998 return (EBUSY); 999 } 1000 if ((vp->v_iflag & VI_DOOMED) == 0) { 1001 atomic_add_long(&recycles_count, 1); 1002 vgonel(vp); 1003 } 1004 VOP_UNLOCK(vp, LK_INTERLOCK); 1005 vn_finished_write(vnmp); 1006 return (0); 1007 } 1008 1009 /* 1010 * Wait for available vnodes. 1011 */ 1012 static int 1013 getnewvnode_wait(int suspended) 1014 { 1015 1016 mtx_assert(&vnode_free_list_mtx, MA_OWNED); 1017 if (numvnodes > desiredvnodes) { 1018 if (suspended) { 1019 /* 1020 * File system is beeing suspended, we cannot risk a 1021 * deadlock here, so allocate new vnode anyway. 1022 */ 1023 if (freevnodes > wantfreevnodes) 1024 vnlru_free(freevnodes - wantfreevnodes); 1025 return (0); 1026 } 1027 if (vnlruproc_sig == 0) { 1028 vnlruproc_sig = 1; /* avoid unnecessary wakeups */ 1029 wakeup(vnlruproc); 1030 } 1031 msleep(&vnlruproc_sig, &vnode_free_list_mtx, PVFS, 1032 "vlruwk", hz); 1033 } 1034 return (numvnodes > desiredvnodes ? ENFILE : 0); 1035 } 1036 1037 void 1038 getnewvnode_reserve(u_int count) 1039 { 1040 struct thread *td; 1041 1042 td = curthread; 1043 /* First try to be quick and racy. */ 1044 if (atomic_fetchadd_long(&numvnodes, count) + count <= desiredvnodes) { 1045 td->td_vp_reserv += count; 1046 return; 1047 } else 1048 atomic_subtract_long(&numvnodes, count); 1049 1050 mtx_lock(&vnode_free_list_mtx); 1051 while (count > 0) { 1052 if (getnewvnode_wait(0) == 0) { 1053 count--; 1054 td->td_vp_reserv++; 1055 atomic_add_long(&numvnodes, 1); 1056 } 1057 } 1058 mtx_unlock(&vnode_free_list_mtx); 1059 } 1060 1061 void 1062 getnewvnode_drop_reserve(void) 1063 { 1064 struct thread *td; 1065 1066 td = curthread; 1067 atomic_subtract_long(&numvnodes, td->td_vp_reserv); 1068 td->td_vp_reserv = 0; 1069 } 1070 1071 /* 1072 * Return the next vnode from the free list. 1073 */ 1074 int 1075 getnewvnode(const char *tag, struct mount *mp, struct vop_vector *vops, 1076 struct vnode **vpp) 1077 { 1078 struct vnode *vp; 1079 struct bufobj *bo; 1080 struct thread *td; 1081 int error; 1082 1083 CTR3(KTR_VFS, "%s: mp %p with tag %s", __func__, mp, tag); 1084 vp = NULL; 1085 td = curthread; 1086 if (td->td_vp_reserv > 0) { 1087 td->td_vp_reserv -= 1; 1088 goto alloc; 1089 } 1090 mtx_lock(&vnode_free_list_mtx); 1091 /* 1092 * Lend our context to reclaim vnodes if they've exceeded the max. 1093 */ 1094 if (freevnodes > wantfreevnodes) 1095 vnlru_free(1); 1096 error = getnewvnode_wait(mp != NULL && (mp->mnt_kern_flag & 1097 MNTK_SUSPEND)); 1098 #if 0 /* XXX Not all VFS_VGET/ffs_vget callers check returns. */ 1099 if (error != 0) { 1100 mtx_unlock(&vnode_free_list_mtx); 1101 return (error); 1102 } 1103 #endif 1104 atomic_add_long(&numvnodes, 1); 1105 mtx_unlock(&vnode_free_list_mtx); 1106 alloc: 1107 atomic_add_long(&vnodes_created, 1); 1108 vp = (struct vnode *) uma_zalloc(vnode_zone, M_WAITOK|M_ZERO); 1109 /* 1110 * Setup locks. 1111 */ 1112 vp->v_vnlock = &vp->v_lock; 1113 mtx_init(&vp->v_interlock, "vnode interlock", NULL, MTX_DEF); 1114 /* 1115 * By default, don't allow shared locks unless filesystems 1116 * opt-in. 1117 */ 1118 lockinit(vp->v_vnlock, PVFS, tag, VLKTIMEOUT, LK_NOSHARE | LK_IS_VNODE); 1119 /* 1120 * Initialize bufobj. 1121 */ 1122 bo = &vp->v_bufobj; 1123 bo->__bo_vnode = vp; 1124 rw_init(BO_LOCKPTR(bo), "bufobj interlock"); 1125 bo->bo_ops = &buf_ops_bio; 1126 bo->bo_private = vp; 1127 TAILQ_INIT(&bo->bo_clean.bv_hd); 1128 TAILQ_INIT(&bo->bo_dirty.bv_hd); 1129 /* 1130 * Initialize namecache. 1131 */ 1132 LIST_INIT(&vp->v_cache_src); 1133 TAILQ_INIT(&vp->v_cache_dst); 1134 /* 1135 * Finalize various vnode identity bits. 1136 */ 1137 vp->v_type = VNON; 1138 vp->v_tag = tag; 1139 vp->v_op = vops; 1140 v_incr_usecount(vp); 1141 vp->v_data = NULL; 1142 #ifdef MAC 1143 mac_vnode_init(vp); 1144 if (mp != NULL && (mp->mnt_flag & MNT_MULTILABEL) == 0) 1145 mac_vnode_associate_singlelabel(mp, vp); 1146 else if (mp == NULL && vops != &dead_vnodeops) 1147 printf("NULL mp in getnewvnode()\n"); 1148 #endif 1149 if (mp != NULL) { 1150 bo->bo_bsize = mp->mnt_stat.f_iosize; 1151 if ((mp->mnt_kern_flag & MNTK_NOKNOTE) != 0) 1152 vp->v_vflag |= VV_NOKNOTE; 1153 } 1154 rangelock_init(&vp->v_rl); 1155 1156 /* 1157 * For the filesystems which do not use vfs_hash_insert(), 1158 * still initialize v_hash to have vfs_hash_index() useful. 1159 * E.g., nullfs uses vfs_hash_index() on the lower vnode for 1160 * its own hashing. 1161 */ 1162 vp->v_hash = (uintptr_t)vp >> vnsz2log; 1163 1164 *vpp = vp; 1165 return (0); 1166 } 1167 1168 /* 1169 * Delete from old mount point vnode list, if on one. 1170 */ 1171 static void 1172 delmntque(struct vnode *vp) 1173 { 1174 struct mount *mp; 1175 int active; 1176 1177 mp = vp->v_mount; 1178 if (mp == NULL) 1179 return; 1180 MNT_ILOCK(mp); 1181 VI_LOCK(vp); 1182 KASSERT(mp->mnt_activevnodelistsize <= mp->mnt_nvnodelistsize, 1183 ("Active vnode list size %d > Vnode list size %d", 1184 mp->mnt_activevnodelistsize, mp->mnt_nvnodelistsize)); 1185 active = vp->v_iflag & VI_ACTIVE; 1186 vp->v_iflag &= ~VI_ACTIVE; 1187 if (active) { 1188 mtx_lock(&vnode_free_list_mtx); 1189 TAILQ_REMOVE(&mp->mnt_activevnodelist, vp, v_actfreelist); 1190 mp->mnt_activevnodelistsize--; 1191 mtx_unlock(&vnode_free_list_mtx); 1192 } 1193 vp->v_mount = NULL; 1194 VI_UNLOCK(vp); 1195 VNASSERT(mp->mnt_nvnodelistsize > 0, vp, 1196 ("bad mount point vnode list size")); 1197 TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 1198 mp->mnt_nvnodelistsize--; 1199 MNT_REL(mp); 1200 MNT_IUNLOCK(mp); 1201 } 1202 1203 static void 1204 insmntque_stddtr(struct vnode *vp, void *dtr_arg) 1205 { 1206 1207 vp->v_data = NULL; 1208 vp->v_op = &dead_vnodeops; 1209 vgone(vp); 1210 vput(vp); 1211 } 1212 1213 /* 1214 * Insert into list of vnodes for the new mount point, if available. 1215 */ 1216 int 1217 insmntque1(struct vnode *vp, struct mount *mp, 1218 void (*dtr)(struct vnode *, void *), void *dtr_arg) 1219 { 1220 1221 KASSERT(vp->v_mount == NULL, 1222 ("insmntque: vnode already on per mount vnode list")); 1223 VNASSERT(mp != NULL, vp, ("Don't call insmntque(foo, NULL)")); 1224 ASSERT_VOP_ELOCKED(vp, "insmntque: non-locked vp"); 1225 1226 /* 1227 * We acquire the vnode interlock early to ensure that the 1228 * vnode cannot be recycled by another process releasing a 1229 * holdcnt on it before we get it on both the vnode list 1230 * and the active vnode list. The mount mutex protects only 1231 * manipulation of the vnode list and the vnode freelist 1232 * mutex protects only manipulation of the active vnode list. 1233 * Hence the need to hold the vnode interlock throughout. 1234 */ 1235 MNT_ILOCK(mp); 1236 VI_LOCK(vp); 1237 if (((mp->mnt_kern_flag & MNTK_NOINSMNTQ) != 0 && 1238 ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0 || 1239 mp->mnt_nvnodelistsize == 0)) && 1240 (vp->v_vflag & VV_FORCEINSMQ) == 0) { 1241 VI_UNLOCK(vp); 1242 MNT_IUNLOCK(mp); 1243 if (dtr != NULL) 1244 dtr(vp, dtr_arg); 1245 return (EBUSY); 1246 } 1247 vp->v_mount = mp; 1248 MNT_REF(mp); 1249 TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 1250 VNASSERT(mp->mnt_nvnodelistsize >= 0, vp, 1251 ("neg mount point vnode list size")); 1252 mp->mnt_nvnodelistsize++; 1253 KASSERT((vp->v_iflag & VI_ACTIVE) == 0, 1254 ("Activating already active vnode")); 1255 vp->v_iflag |= VI_ACTIVE; 1256 mtx_lock(&vnode_free_list_mtx); 1257 TAILQ_INSERT_HEAD(&mp->mnt_activevnodelist, vp, v_actfreelist); 1258 mp->mnt_activevnodelistsize++; 1259 mtx_unlock(&vnode_free_list_mtx); 1260 VI_UNLOCK(vp); 1261 MNT_IUNLOCK(mp); 1262 return (0); 1263 } 1264 1265 int 1266 insmntque(struct vnode *vp, struct mount *mp) 1267 { 1268 1269 return (insmntque1(vp, mp, insmntque_stddtr, NULL)); 1270 } 1271 1272 /* 1273 * Flush out and invalidate all buffers associated with a bufobj 1274 * Called with the underlying object locked. 1275 */ 1276 int 1277 bufobj_invalbuf(struct bufobj *bo, int flags, int slpflag, int slptimeo) 1278 { 1279 int error; 1280 1281 BO_LOCK(bo); 1282 if (flags & V_SAVE) { 1283 error = bufobj_wwait(bo, slpflag, slptimeo); 1284 if (error) { 1285 BO_UNLOCK(bo); 1286 return (error); 1287 } 1288 if (bo->bo_dirty.bv_cnt > 0) { 1289 BO_UNLOCK(bo); 1290 if ((error = BO_SYNC(bo, MNT_WAIT)) != 0) 1291 return (error); 1292 /* 1293 * XXX We could save a lock/unlock if this was only 1294 * enabled under INVARIANTS 1295 */ 1296 BO_LOCK(bo); 1297 if (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0) 1298 panic("vinvalbuf: dirty bufs"); 1299 } 1300 } 1301 /* 1302 * If you alter this loop please notice that interlock is dropped and 1303 * reacquired in flushbuflist. Special care is needed to ensure that 1304 * no race conditions occur from this. 1305 */ 1306 do { 1307 error = flushbuflist(&bo->bo_clean, 1308 flags, bo, slpflag, slptimeo); 1309 if (error == 0 && !(flags & V_CLEANONLY)) 1310 error = flushbuflist(&bo->bo_dirty, 1311 flags, bo, slpflag, slptimeo); 1312 if (error != 0 && error != EAGAIN) { 1313 BO_UNLOCK(bo); 1314 return (error); 1315 } 1316 } while (error != 0); 1317 1318 /* 1319 * Wait for I/O to complete. XXX needs cleaning up. The vnode can 1320 * have write I/O in-progress but if there is a VM object then the 1321 * VM object can also have read-I/O in-progress. 1322 */ 1323 do { 1324 bufobj_wwait(bo, 0, 0); 1325 BO_UNLOCK(bo); 1326 if (bo->bo_object != NULL) { 1327 VM_OBJECT_WLOCK(bo->bo_object); 1328 vm_object_pip_wait(bo->bo_object, "bovlbx"); 1329 VM_OBJECT_WUNLOCK(bo->bo_object); 1330 } 1331 BO_LOCK(bo); 1332 } while (bo->bo_numoutput > 0); 1333 BO_UNLOCK(bo); 1334 1335 /* 1336 * Destroy the copy in the VM cache, too. 1337 */ 1338 if (bo->bo_object != NULL && 1339 (flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0) { 1340 VM_OBJECT_WLOCK(bo->bo_object); 1341 vm_object_page_remove(bo->bo_object, 0, 0, (flags & V_SAVE) ? 1342 OBJPR_CLEANONLY : 0); 1343 VM_OBJECT_WUNLOCK(bo->bo_object); 1344 } 1345 1346 #ifdef INVARIANTS 1347 BO_LOCK(bo); 1348 if ((flags & (V_ALT | V_NORMAL | V_CLEANONLY)) == 0 && 1349 (bo->bo_dirty.bv_cnt > 0 || bo->bo_clean.bv_cnt > 0)) 1350 panic("vinvalbuf: flush failed"); 1351 BO_UNLOCK(bo); 1352 #endif 1353 return (0); 1354 } 1355 1356 /* 1357 * Flush out and invalidate all buffers associated with a vnode. 1358 * Called with the underlying object locked. 1359 */ 1360 int 1361 vinvalbuf(struct vnode *vp, int flags, int slpflag, int slptimeo) 1362 { 1363 1364 CTR3(KTR_VFS, "%s: vp %p with flags %d", __func__, vp, flags); 1365 ASSERT_VOP_LOCKED(vp, "vinvalbuf"); 1366 if (vp->v_object != NULL && vp->v_object->handle != vp) 1367 return (0); 1368 return (bufobj_invalbuf(&vp->v_bufobj, flags, slpflag, slptimeo)); 1369 } 1370 1371 /* 1372 * Flush out buffers on the specified list. 1373 * 1374 */ 1375 static int 1376 flushbuflist(struct bufv *bufv, int flags, struct bufobj *bo, int slpflag, 1377 int slptimeo) 1378 { 1379 struct buf *bp, *nbp; 1380 int retval, error; 1381 daddr_t lblkno; 1382 b_xflags_t xflags; 1383 1384 ASSERT_BO_WLOCKED(bo); 1385 1386 retval = 0; 1387 TAILQ_FOREACH_SAFE(bp, &bufv->bv_hd, b_bobufs, nbp) { 1388 if (((flags & V_NORMAL) && (bp->b_xflags & BX_ALTDATA)) || 1389 ((flags & V_ALT) && (bp->b_xflags & BX_ALTDATA) == 0)) { 1390 continue; 1391 } 1392 lblkno = 0; 1393 xflags = 0; 1394 if (nbp != NULL) { 1395 lblkno = nbp->b_lblkno; 1396 xflags = nbp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN); 1397 } 1398 retval = EAGAIN; 1399 error = BUF_TIMELOCK(bp, 1400 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, BO_LOCKPTR(bo), 1401 "flushbuf", slpflag, slptimeo); 1402 if (error) { 1403 BO_LOCK(bo); 1404 return (error != ENOLCK ? error : EAGAIN); 1405 } 1406 KASSERT(bp->b_bufobj == bo, 1407 ("bp %p wrong b_bufobj %p should be %p", 1408 bp, bp->b_bufobj, bo)); 1409 if (bp->b_bufobj != bo) { /* XXX: necessary ? */ 1410 BUF_UNLOCK(bp); 1411 BO_LOCK(bo); 1412 return (EAGAIN); 1413 } 1414 /* 1415 * XXX Since there are no node locks for NFS, I 1416 * believe there is a slight chance that a delayed 1417 * write will occur while sleeping just above, so 1418 * check for it. 1419 */ 1420 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && 1421 (flags & V_SAVE)) { 1422 bremfree(bp); 1423 bp->b_flags |= B_ASYNC; 1424 bwrite(bp); 1425 BO_LOCK(bo); 1426 return (EAGAIN); /* XXX: why not loop ? */ 1427 } 1428 bremfree(bp); 1429 bp->b_flags |= (B_INVAL | B_RELBUF); 1430 bp->b_flags &= ~B_ASYNC; 1431 brelse(bp); 1432 BO_LOCK(bo); 1433 if (nbp != NULL && 1434 (nbp->b_bufobj != bo || 1435 nbp->b_lblkno != lblkno || 1436 (nbp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) != xflags)) 1437 break; /* nbp invalid */ 1438 } 1439 return (retval); 1440 } 1441 1442 /* 1443 * Truncate a file's buffer and pages to a specified length. This 1444 * is in lieu of the old vinvalbuf mechanism, which performed unneeded 1445 * sync activity. 1446 */ 1447 int 1448 vtruncbuf(struct vnode *vp, struct ucred *cred, off_t length, int blksize) 1449 { 1450 struct buf *bp, *nbp; 1451 int anyfreed; 1452 int trunclbn; 1453 struct bufobj *bo; 1454 1455 CTR5(KTR_VFS, "%s: vp %p with cred %p and block %d:%ju", __func__, 1456 vp, cred, blksize, (uintmax_t)length); 1457 1458 /* 1459 * Round up to the *next* lbn. 1460 */ 1461 trunclbn = (length + blksize - 1) / blksize; 1462 1463 ASSERT_VOP_LOCKED(vp, "vtruncbuf"); 1464 restart: 1465 bo = &vp->v_bufobj; 1466 BO_LOCK(bo); 1467 anyfreed = 1; 1468 for (;anyfreed;) { 1469 anyfreed = 0; 1470 TAILQ_FOREACH_SAFE(bp, &bo->bo_clean.bv_hd, b_bobufs, nbp) { 1471 if (bp->b_lblkno < trunclbn) 1472 continue; 1473 if (BUF_LOCK(bp, 1474 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 1475 BO_LOCKPTR(bo)) == ENOLCK) 1476 goto restart; 1477 1478 bremfree(bp); 1479 bp->b_flags |= (B_INVAL | B_RELBUF); 1480 bp->b_flags &= ~B_ASYNC; 1481 brelse(bp); 1482 anyfreed = 1; 1483 1484 BO_LOCK(bo); 1485 if (nbp != NULL && 1486 (((nbp->b_xflags & BX_VNCLEAN) == 0) || 1487 (nbp->b_vp != vp) || 1488 (nbp->b_flags & B_DELWRI))) { 1489 BO_UNLOCK(bo); 1490 goto restart; 1491 } 1492 } 1493 1494 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 1495 if (bp->b_lblkno < trunclbn) 1496 continue; 1497 if (BUF_LOCK(bp, 1498 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 1499 BO_LOCKPTR(bo)) == ENOLCK) 1500 goto restart; 1501 bremfree(bp); 1502 bp->b_flags |= (B_INVAL | B_RELBUF); 1503 bp->b_flags &= ~B_ASYNC; 1504 brelse(bp); 1505 anyfreed = 1; 1506 1507 BO_LOCK(bo); 1508 if (nbp != NULL && 1509 (((nbp->b_xflags & BX_VNDIRTY) == 0) || 1510 (nbp->b_vp != vp) || 1511 (nbp->b_flags & B_DELWRI) == 0)) { 1512 BO_UNLOCK(bo); 1513 goto restart; 1514 } 1515 } 1516 } 1517 1518 if (length > 0) { 1519 restartsync: 1520 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { 1521 if (bp->b_lblkno > 0) 1522 continue; 1523 /* 1524 * Since we hold the vnode lock this should only 1525 * fail if we're racing with the buf daemon. 1526 */ 1527 if (BUF_LOCK(bp, 1528 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, 1529 BO_LOCKPTR(bo)) == ENOLCK) { 1530 goto restart; 1531 } 1532 VNASSERT((bp->b_flags & B_DELWRI), vp, 1533 ("buf(%p) on dirty queue without DELWRI", bp)); 1534 1535 bremfree(bp); 1536 bawrite(bp); 1537 BO_LOCK(bo); 1538 goto restartsync; 1539 } 1540 } 1541 1542 bufobj_wwait(bo, 0, 0); 1543 BO_UNLOCK(bo); 1544 vnode_pager_setsize(vp, length); 1545 1546 return (0); 1547 } 1548 1549 static void 1550 buf_vlist_remove(struct buf *bp) 1551 { 1552 struct bufv *bv; 1553 1554 KASSERT(bp->b_bufobj != NULL, ("No b_bufobj %p", bp)); 1555 ASSERT_BO_WLOCKED(bp->b_bufobj); 1556 KASSERT((bp->b_xflags & (BX_VNDIRTY|BX_VNCLEAN)) != 1557 (BX_VNDIRTY|BX_VNCLEAN), 1558 ("buf_vlist_remove: Buf %p is on two lists", bp)); 1559 if (bp->b_xflags & BX_VNDIRTY) 1560 bv = &bp->b_bufobj->bo_dirty; 1561 else 1562 bv = &bp->b_bufobj->bo_clean; 1563 BUF_PCTRIE_REMOVE(&bv->bv_root, bp->b_lblkno); 1564 TAILQ_REMOVE(&bv->bv_hd, bp, b_bobufs); 1565 bv->bv_cnt--; 1566 bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); 1567 } 1568 1569 /* 1570 * Add the buffer to the sorted clean or dirty block list. 1571 * 1572 * NOTE: xflags is passed as a constant, optimizing this inline function! 1573 */ 1574 static void 1575 buf_vlist_add(struct buf *bp, struct bufobj *bo, b_xflags_t xflags) 1576 { 1577 struct bufv *bv; 1578 struct buf *n; 1579 int error; 1580 1581 ASSERT_BO_WLOCKED(bo); 1582 KASSERT((bo->bo_flag & BO_DEAD) == 0, ("dead bo %p", bo)); 1583 KASSERT((bp->b_xflags & (BX_VNDIRTY|BX_VNCLEAN)) == 0, 1584 ("buf_vlist_add: Buf %p has existing xflags %d", bp, bp->b_xflags)); 1585 bp->b_xflags |= xflags; 1586 if (xflags & BX_VNDIRTY) 1587 bv = &bo->bo_dirty; 1588 else 1589 bv = &bo->bo_clean; 1590 1591 /* 1592 * Keep the list ordered. Optimize empty list insertion. Assume 1593 * we tend to grow at the tail so lookup_le should usually be cheaper 1594 * than _ge. 1595 */ 1596 if (bv->bv_cnt == 0 || 1597 bp->b_lblkno > TAILQ_LAST(&bv->bv_hd, buflists)->b_lblkno) 1598 TAILQ_INSERT_TAIL(&bv->bv_hd, bp, b_bobufs); 1599 else if ((n = BUF_PCTRIE_LOOKUP_LE(&bv->bv_root, bp->b_lblkno)) == NULL) 1600 TAILQ_INSERT_HEAD(&bv->bv_hd, bp, b_bobufs); 1601 else 1602 TAILQ_INSERT_AFTER(&bv->bv_hd, n, bp, b_bobufs); 1603 error = BUF_PCTRIE_INSERT(&bv->bv_root, bp); 1604 if (error) 1605 panic("buf_vlist_add: Preallocated nodes insufficient."); 1606 bv->bv_cnt++; 1607 } 1608 1609 /* 1610 * Lookup a buffer using the splay tree. Note that we specifically avoid 1611 * shadow buffers used in background bitmap writes. 1612 * 1613 * This code isn't quite efficient as it could be because we are maintaining 1614 * two sorted lists and do not know which list the block resides in. 1615 * 1616 * During a "make buildworld" the desired buffer is found at one of 1617 * the roots more than 60% of the time. Thus, checking both roots 1618 * before performing either splay eliminates unnecessary splays on the 1619 * first tree splayed. 1620 */ 1621 struct buf * 1622 gbincore(struct bufobj *bo, daddr_t lblkno) 1623 { 1624 struct buf *bp; 1625 1626 ASSERT_BO_LOCKED(bo); 1627 bp = BUF_PCTRIE_LOOKUP(&bo->bo_clean.bv_root, lblkno); 1628 if (bp != NULL) 1629 return (bp); 1630 return BUF_PCTRIE_LOOKUP(&bo->bo_dirty.bv_root, lblkno); 1631 } 1632 1633 /* 1634 * Associate a buffer with a vnode. 1635 */ 1636 void 1637 bgetvp(struct vnode *vp, struct buf *bp) 1638 { 1639 struct bufobj *bo; 1640 1641 bo = &vp->v_bufobj; 1642 ASSERT_BO_WLOCKED(bo); 1643 VNASSERT(bp->b_vp == NULL, bp->b_vp, ("bgetvp: not free")); 1644 1645 CTR3(KTR_BUF, "bgetvp(%p) vp %p flags %X", bp, vp, bp->b_flags); 1646 VNASSERT((bp->b_xflags & (BX_VNDIRTY|BX_VNCLEAN)) == 0, vp, 1647 ("bgetvp: bp already attached! %p", bp)); 1648 1649 vhold(vp); 1650 bp->b_vp = vp; 1651 bp->b_bufobj = bo; 1652 /* 1653 * Insert onto list for new vnode. 1654 */ 1655 buf_vlist_add(bp, bo, BX_VNCLEAN); 1656 } 1657 1658 /* 1659 * Disassociate a buffer from a vnode. 1660 */ 1661 void 1662 brelvp(struct buf *bp) 1663 { 1664 struct bufobj *bo; 1665 struct vnode *vp; 1666 1667 CTR3(KTR_BUF, "brelvp(%p) vp %p flags %X", bp, bp->b_vp, bp->b_flags); 1668 KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); 1669 1670 /* 1671 * Delete from old vnode list, if on one. 1672 */ 1673 vp = bp->b_vp; /* XXX */ 1674 bo = bp->b_bufobj; 1675 BO_LOCK(bo); 1676 if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) 1677 buf_vlist_remove(bp); 1678 else 1679 panic("brelvp: Buffer %p not on queue.", bp); 1680 if ((bo->bo_flag & BO_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) { 1681 bo->bo_flag &= ~BO_ONWORKLST; 1682 mtx_lock(&sync_mtx); 1683 LIST_REMOVE(bo, bo_synclist); 1684 syncer_worklist_len--; 1685 mtx_unlock(&sync_mtx); 1686 } 1687 bp->b_vp = NULL; 1688 bp->b_bufobj = NULL; 1689 BO_UNLOCK(bo); 1690 vdrop(vp); 1691 } 1692 1693 /* 1694 * Add an item to the syncer work queue. 1695 */ 1696 static void 1697 vn_syncer_add_to_worklist(struct bufobj *bo, int delay) 1698 { 1699 int slot; 1700 1701 ASSERT_BO_WLOCKED(bo); 1702 1703 mtx_lock(&sync_mtx); 1704 if (bo->bo_flag & BO_ONWORKLST) 1705 LIST_REMOVE(bo, bo_synclist); 1706 else { 1707 bo->bo_flag |= BO_ONWORKLST; 1708 syncer_worklist_len++; 1709 } 1710 1711 if (delay > syncer_maxdelay - 2) 1712 delay = syncer_maxdelay - 2; 1713 slot = (syncer_delayno + delay) & syncer_mask; 1714 1715 LIST_INSERT_HEAD(&syncer_workitem_pending[slot], bo, bo_synclist); 1716 mtx_unlock(&sync_mtx); 1717 } 1718 1719 static int 1720 sysctl_vfs_worklist_len(SYSCTL_HANDLER_ARGS) 1721 { 1722 int error, len; 1723 1724 mtx_lock(&sync_mtx); 1725 len = syncer_worklist_len - sync_vnode_count; 1726 mtx_unlock(&sync_mtx); 1727 error = SYSCTL_OUT(req, &len, sizeof(len)); 1728 return (error); 1729 } 1730 1731 SYSCTL_PROC(_vfs, OID_AUTO, worklist_len, CTLTYPE_INT | CTLFLAG_RD, NULL, 0, 1732 sysctl_vfs_worklist_len, "I", "Syncer thread worklist length"); 1733 1734 static struct proc *updateproc; 1735 static void sched_sync(void); 1736 static struct kproc_desc up_kp = { 1737 "syncer", 1738 sched_sync, 1739 &updateproc 1740 }; 1741 SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp); 1742 1743 static int 1744 sync_vnode(struct synclist *slp, struct bufobj **bo, struct thread *td) 1745 { 1746 struct vnode *vp; 1747 struct mount *mp; 1748 1749 *bo = LIST_FIRST(slp); 1750 if (*bo == NULL) 1751 return (0); 1752 vp = (*bo)->__bo_vnode; /* XXX */ 1753 if (VOP_ISLOCKED(vp) != 0 || VI_TRYLOCK(vp) == 0) 1754 return (1); 1755 /* 1756 * We use vhold in case the vnode does not 1757 * successfully sync. vhold prevents the vnode from 1758 * going away when we unlock the sync_mtx so that 1759 * we can acquire the vnode interlock. 1760 */ 1761 vholdl(vp); 1762 mtx_unlock(&sync_mtx); 1763 VI_UNLOCK(vp); 1764 if (vn_start_write(vp, &mp, V_NOWAIT) != 0) { 1765 vdrop(vp); 1766 mtx_lock(&sync_mtx); 1767 return (*bo == LIST_FIRST(slp)); 1768 } 1769 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1770 (void) VOP_FSYNC(vp, MNT_LAZY, td); 1771 VOP_UNLOCK(vp, 0); 1772 vn_finished_write(mp); 1773 BO_LOCK(*bo); 1774 if (((*bo)->bo_flag & BO_ONWORKLST) != 0) { 1775 /* 1776 * Put us back on the worklist. The worklist 1777 * routine will remove us from our current 1778 * position and then add us back in at a later 1779 * position. 1780 */ 1781 vn_syncer_add_to_worklist(*bo, syncdelay); 1782 } 1783 BO_UNLOCK(*bo); 1784 vdrop(vp); 1785 mtx_lock(&sync_mtx); 1786 return (0); 1787 } 1788 1789 static int first_printf = 1; 1790 1791 /* 1792 * System filesystem synchronizer daemon. 1793 */ 1794 static void 1795 sched_sync(void) 1796 { 1797 struct synclist *next, *slp; 1798 struct bufobj *bo; 1799 long starttime; 1800 struct thread *td = curthread; 1801 int last_work_seen; 1802 int net_worklist_len; 1803 int syncer_final_iter; 1804 int error; 1805 1806 last_work_seen = 0; 1807 syncer_final_iter = 0; 1808 syncer_state = SYNCER_RUNNING; 1809 starttime = time_uptime; 1810 td->td_pflags |= TDP_NORUNNINGBUF; 1811 1812 EVENTHANDLER_REGISTER(shutdown_pre_sync, syncer_shutdown, td->td_proc, 1813 SHUTDOWN_PRI_LAST); 1814 1815 mtx_lock(&sync_mtx); 1816 for (;;) { 1817 if (syncer_state == SYNCER_FINAL_DELAY && 1818 syncer_final_iter == 0) { 1819 mtx_unlock(&sync_mtx); 1820 kproc_suspend_check(td->td_proc); 1821 mtx_lock(&sync_mtx); 1822 } 1823 net_worklist_len = syncer_worklist_len - sync_vnode_count; 1824 if (syncer_state != SYNCER_RUNNING && 1825 starttime != time_uptime) { 1826 if (first_printf) { 1827 printf("\nSyncing disks, vnodes remaining..."); 1828 first_printf = 0; 1829 } 1830 printf("%d ", net_worklist_len); 1831 } 1832 starttime = time_uptime; 1833 1834 /* 1835 * Push files whose dirty time has expired. Be careful 1836 * of interrupt race on slp queue. 1837 * 1838 * Skip over empty worklist slots when shutting down. 1839 */ 1840 do { 1841 slp = &syncer_workitem_pending[syncer_delayno]; 1842 syncer_delayno += 1; 1843 if (syncer_delayno == syncer_maxdelay) 1844 syncer_delayno = 0; 1845 next = &syncer_workitem_pending[syncer_delayno]; 1846 /* 1847 * If the worklist has wrapped since the 1848 * it was emptied of all but syncer vnodes, 1849 * switch to the FINAL_DELAY state and run 1850 * for one more second. 1851 */ 1852 if (syncer_state == SYNCER_SHUTTING_DOWN && 1853 net_worklist_len == 0 && 1854 last_work_seen == syncer_delayno) { 1855 syncer_state = SYNCER_FINAL_DELAY; 1856 syncer_final_iter = SYNCER_SHUTDOWN_SPEEDUP; 1857 } 1858 } while (syncer_state != SYNCER_RUNNING && LIST_EMPTY(slp) && 1859 syncer_worklist_len > 0); 1860 1861 /* 1862 * Keep track of the last time there was anything 1863 * on the worklist other than syncer vnodes. 1864 * Return to the SHUTTING_DOWN state if any 1865 * new work appears. 1866 */ 1867 if (net_worklist_len > 0 || syncer_state == SYNCER_RUNNING) 1868 last_work_seen = syncer_delayno; 1869 if (net_worklist_len > 0 && syncer_state == SYNCER_FINAL_DELAY) 1870 syncer_state = SYNCER_SHUTTING_DOWN; 1871 while (!LIST_EMPTY(slp)) { 1872 error = sync_vnode(slp, &bo, td); 1873 if (error == 1) { 1874 LIST_REMOVE(bo, bo_synclist); 1875 LIST_INSERT_HEAD(next, bo, bo_synclist); 1876 continue; 1877 } 1878 1879 if (first_printf == 0) { 1880 /* 1881 * Drop the sync mutex, because some watchdog 1882 * drivers need to sleep while patting 1883 */ 1884 mtx_unlock(&sync_mtx); 1885 wdog_kern_pat(WD_LASTVAL); 1886 mtx_lock(&sync_mtx); 1887 } 1888 1889 } 1890 if (syncer_state == SYNCER_FINAL_DELAY && syncer_final_iter > 0) 1891 syncer_final_iter--; 1892 /* 1893 * The variable rushjob allows the kernel to speed up the 1894 * processing of the filesystem syncer process. A rushjob 1895 * value of N tells the filesystem syncer to process the next 1896 * N seconds worth of work on its queue ASAP. Currently rushjob 1897 * is used by the soft update code to speed up the filesystem 1898 * syncer process when the incore state is getting so far 1899 * ahead of the disk that the kernel memory pool is being 1900 * threatened with exhaustion. 1901 */ 1902 if (rushjob > 0) { 1903 rushjob -= 1; 1904 continue; 1905 } 1906 /* 1907 * Just sleep for a short period of time between 1908 * iterations when shutting down to allow some I/O 1909 * to happen. 1910 * 1911 * If it has taken us less than a second to process the 1912 * current work, then wait. Otherwise start right over 1913 * again. We can still lose time if any single round 1914 * takes more than two seconds, but it does not really 1915 * matter as we are just trying to generally pace the 1916 * filesystem activity. 1917 */ 1918 if (syncer_state != SYNCER_RUNNING || 1919 time_uptime == starttime) { 1920 thread_lock(td); 1921 sched_prio(td, PPAUSE); 1922 thread_unlock(td); 1923 } 1924 if (syncer_state != SYNCER_RUNNING) 1925 cv_timedwait(&sync_wakeup, &sync_mtx, 1926 hz / SYNCER_SHUTDOWN_SPEEDUP); 1927 else if (time_uptime == starttime) 1928 cv_timedwait(&sync_wakeup, &sync_mtx, hz); 1929 } 1930 } 1931 1932 /* 1933 * Request the syncer daemon to speed up its work. 1934 * We never push it to speed up more than half of its 1935 * normal turn time, otherwise it could take over the cpu. 1936 */ 1937 int 1938 speedup_syncer(void) 1939 { 1940 int ret = 0; 1941 1942 mtx_lock(&sync_mtx); 1943 if (rushjob < syncdelay / 2) { 1944 rushjob += 1; 1945 stat_rush_requests += 1; 1946 ret = 1; 1947 } 1948 mtx_unlock(&sync_mtx); 1949 cv_broadcast(&sync_wakeup); 1950 return (ret); 1951 } 1952 1953 /* 1954 * Tell the syncer to speed up its work and run though its work 1955 * list several times, then tell it to shut down. 1956 */ 1957 static void 1958 syncer_shutdown(void *arg, int howto) 1959 { 1960 1961 if (howto & RB_NOSYNC) 1962 return; 1963 mtx_lock(&sync_mtx); 1964 syncer_state = SYNCER_SHUTTING_DOWN; 1965 rushjob = 0; 1966 mtx_unlock(&sync_mtx); 1967 cv_broadcast(&sync_wakeup); 1968 kproc_shutdown(arg, howto); 1969 } 1970 1971 void 1972 syncer_suspend(void) 1973 { 1974 1975 syncer_shutdown(updateproc, 0); 1976 } 1977 1978 void 1979 syncer_resume(void) 1980 { 1981 1982 mtx_lock(&sync_mtx); 1983 first_printf = 1; 1984 syncer_state = SYNCER_RUNNING; 1985 mtx_unlock(&sync_mtx); 1986 cv_broadcast(&sync_wakeup); 1987 kproc_resume(updateproc); 1988 } 1989 1990 /* 1991 * Reassign a buffer from one vnode to another. 1992 * Used to assign file specific control information 1993 * (indirect blocks) to the vnode to which they belong. 1994 */ 1995 void 1996 reassignbuf(struct buf *bp) 1997 { 1998 struct vnode *vp; 1999 struct bufobj *bo; 2000 int delay; 2001 #ifdef INVARIANTS 2002 struct bufv *bv; 2003 #endif 2004 2005 vp = bp->b_vp; 2006 bo = bp->b_bufobj; 2007 ++reassignbufcalls; 2008 2009 CTR3(KTR_BUF, "reassignbuf(%p) vp %p flags %X", 2010 bp, bp->b_vp, bp->b_flags); 2011 /* 2012 * B_PAGING flagged buffers cannot be reassigned because their vp 2013 * is not fully linked in. 2014 */ 2015 if (bp->b_flags & B_PAGING) 2016 panic("cannot reassign paging buffer"); 2017 2018 /* 2019 * Delete from old vnode list, if on one. 2020 */ 2021 BO_LOCK(bo); 2022 if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) 2023 buf_vlist_remove(bp); 2024 else 2025 panic("reassignbuf: Buffer %p not on queue.", bp); 2026 /* 2027 * If dirty, put on list of dirty buffers; otherwise insert onto list 2028 * of clean buffers. 2029 */ 2030 if (bp->b_flags & B_DELWRI) { 2031 if ((bo->bo_flag & BO_ONWORKLST) == 0) { 2032 switch (vp->v_type) { 2033 case VDIR: 2034 delay = dirdelay; 2035 break; 2036 case VCHR: 2037 delay = metadelay; 2038 break; 2039 default: 2040 delay = filedelay; 2041 } 2042 vn_syncer_add_to_worklist(bo, delay); 2043 } 2044 buf_vlist_add(bp, bo, BX_VNDIRTY); 2045 } else { 2046 buf_vlist_add(bp, bo, BX_VNCLEAN); 2047 2048 if ((bo->bo_flag & BO_ONWORKLST) && bo->bo_dirty.bv_cnt == 0) { 2049 mtx_lock(&sync_mtx); 2050 LIST_REMOVE(bo, bo_synclist); 2051 syncer_worklist_len--; 2052 mtx_unlock(&sync_mtx); 2053 bo->bo_flag &= ~BO_ONWORKLST; 2054 } 2055 } 2056 #ifdef INVARIANTS 2057 bv = &bo->bo_clean; 2058 bp = TAILQ_FIRST(&bv->bv_hd); 2059 KASSERT(bp == NULL || bp->b_bufobj == bo, 2060 ("bp %p wrong b_bufobj %p should be %p", bp, bp->b_bufobj, bo)); 2061 bp = TAILQ_LAST(&bv->bv_hd, buflists); 2062 KASSERT(bp == NULL || bp->b_bufobj == bo, 2063 ("bp %p wrong b_bufobj %p should be %p", bp, bp->b_bufobj, bo)); 2064 bv = &bo->bo_dirty; 2065 bp = TAILQ_FIRST(&bv->bv_hd); 2066 KASSERT(bp == NULL || bp->b_bufobj == bo, 2067 ("bp %p wrong b_bufobj %p should be %p", bp, bp->b_bufobj, bo)); 2068 bp = TAILQ_LAST(&bv->bv_hd, buflists); 2069 KASSERT(bp == NULL || bp->b_bufobj == bo, 2070 ("bp %p wrong b_bufobj %p should be %p", bp, bp->b_bufobj, bo)); 2071 #endif 2072 BO_UNLOCK(bo); 2073 } 2074 2075 /* 2076 * Increment the use and hold counts on the vnode, taking care to reference 2077 * the driver's usecount if this is a chardev. The vholdl() will remove 2078 * the vnode from the free list if it is presently free. Requires the 2079 * vnode interlock and returns with it held. 2080 */ 2081 static void 2082 v_incr_usecount(struct vnode *vp) 2083 { 2084 2085 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2086 vholdl(vp); 2087 vp->v_usecount++; 2088 if (vp->v_type == VCHR && vp->v_rdev != NULL) { 2089 dev_lock(); 2090 vp->v_rdev->si_usecount++; 2091 dev_unlock(); 2092 } 2093 } 2094 2095 /* 2096 * Turn a holdcnt into a use+holdcnt such that only one call to 2097 * v_decr_usecount is needed. 2098 */ 2099 static void 2100 v_upgrade_usecount(struct vnode *vp) 2101 { 2102 2103 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2104 vp->v_usecount++; 2105 if (vp->v_type == VCHR && vp->v_rdev != NULL) { 2106 dev_lock(); 2107 vp->v_rdev->si_usecount++; 2108 dev_unlock(); 2109 } 2110 } 2111 2112 /* 2113 * Decrement the vnode use and hold count along with the driver's usecount 2114 * if this is a chardev. The vdropl() below releases the vnode interlock 2115 * as it may free the vnode. 2116 */ 2117 static void 2118 v_decr_usecount(struct vnode *vp) 2119 { 2120 2121 ASSERT_VI_LOCKED(vp, __FUNCTION__); 2122 VNASSERT(vp->v_usecount > 0, vp, 2123 ("v_decr_usecount: negative usecount")); 2124 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2125 vp->v_usecount--; 2126 if (vp->v_type == VCHR && vp->v_rdev != NULL) { 2127 dev_lock(); 2128 vp->v_rdev->si_usecount--; 2129 dev_unlock(); 2130 } 2131 vdropl(vp); 2132 } 2133 2134 /* 2135 * Decrement only the use count and driver use count. This is intended to 2136 * be paired with a follow on vdropl() to release the remaining hold count. 2137 * In this way we may vgone() a vnode with a 0 usecount without risk of 2138 * having it end up on a free list because the hold count is kept above 0. 2139 */ 2140 static void 2141 v_decr_useonly(struct vnode *vp) 2142 { 2143 2144 ASSERT_VI_LOCKED(vp, __FUNCTION__); 2145 VNASSERT(vp->v_usecount > 0, vp, 2146 ("v_decr_useonly: negative usecount")); 2147 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2148 vp->v_usecount--; 2149 if (vp->v_type == VCHR && vp->v_rdev != NULL) { 2150 dev_lock(); 2151 vp->v_rdev->si_usecount--; 2152 dev_unlock(); 2153 } 2154 } 2155 2156 /* 2157 * Grab a particular vnode from the free list, increment its 2158 * reference count and lock it. VI_DOOMED is set if the vnode 2159 * is being destroyed. Only callers who specify LK_RETRY will 2160 * see doomed vnodes. If inactive processing was delayed in 2161 * vput try to do it here. 2162 */ 2163 int 2164 vget(struct vnode *vp, int flags, struct thread *td) 2165 { 2166 int error; 2167 2168 error = 0; 2169 VNASSERT((flags & LK_TYPE_MASK) != 0, vp, 2170 ("vget: invalid lock operation")); 2171 CTR3(KTR_VFS, "%s: vp %p with flags %d", __func__, vp, flags); 2172 2173 if ((flags & LK_INTERLOCK) == 0) 2174 VI_LOCK(vp); 2175 vholdl(vp); 2176 if ((error = vn_lock(vp, flags | LK_INTERLOCK)) != 0) { 2177 vdrop(vp); 2178 CTR2(KTR_VFS, "%s: impossible to lock vnode %p", __func__, 2179 vp); 2180 return (error); 2181 } 2182 if (vp->v_iflag & VI_DOOMED && (flags & LK_RETRY) == 0) 2183 panic("vget: vn_lock failed to return ENOENT\n"); 2184 VI_LOCK(vp); 2185 /* Upgrade our holdcnt to a usecount. */ 2186 v_upgrade_usecount(vp); 2187 /* 2188 * We don't guarantee that any particular close will 2189 * trigger inactive processing so just make a best effort 2190 * here at preventing a reference to a removed file. If 2191 * we don't succeed no harm is done. 2192 */ 2193 if (vp->v_iflag & VI_OWEINACT) { 2194 if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE && 2195 (flags & LK_NOWAIT) == 0) 2196 vinactive(vp, td); 2197 vp->v_iflag &= ~VI_OWEINACT; 2198 } 2199 VI_UNLOCK(vp); 2200 return (0); 2201 } 2202 2203 /* 2204 * Increase the reference count of a vnode. 2205 */ 2206 void 2207 vref(struct vnode *vp) 2208 { 2209 2210 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2211 VI_LOCK(vp); 2212 v_incr_usecount(vp); 2213 VI_UNLOCK(vp); 2214 } 2215 2216 /* 2217 * Return reference count of a vnode. 2218 * 2219 * The results of this call are only guaranteed when some mechanism other 2220 * than the VI lock is used to stop other processes from gaining references 2221 * to the vnode. This may be the case if the caller holds the only reference. 2222 * This is also useful when stale data is acceptable as race conditions may 2223 * be accounted for by some other means. 2224 */ 2225 int 2226 vrefcnt(struct vnode *vp) 2227 { 2228 int usecnt; 2229 2230 VI_LOCK(vp); 2231 usecnt = vp->v_usecount; 2232 VI_UNLOCK(vp); 2233 2234 return (usecnt); 2235 } 2236 2237 #define VPUTX_VRELE 1 2238 #define VPUTX_VPUT 2 2239 #define VPUTX_VUNREF 3 2240 2241 static void 2242 vputx(struct vnode *vp, int func) 2243 { 2244 int error; 2245 2246 KASSERT(vp != NULL, ("vputx: null vp")); 2247 if (func == VPUTX_VUNREF) 2248 ASSERT_VOP_LOCKED(vp, "vunref"); 2249 else if (func == VPUTX_VPUT) 2250 ASSERT_VOP_LOCKED(vp, "vput"); 2251 else 2252 KASSERT(func == VPUTX_VRELE, ("vputx: wrong func")); 2253 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2254 VI_LOCK(vp); 2255 2256 /* Skip this v_writecount check if we're going to panic below. */ 2257 VNASSERT(vp->v_writecount < vp->v_usecount || vp->v_usecount < 1, vp, 2258 ("vputx: missed vn_close")); 2259 error = 0; 2260 2261 if (vp->v_usecount > 1 || ((vp->v_iflag & VI_DOINGINACT) && 2262 vp->v_usecount == 1)) { 2263 if (func == VPUTX_VPUT) 2264 VOP_UNLOCK(vp, 0); 2265 v_decr_usecount(vp); 2266 return; 2267 } 2268 2269 if (vp->v_usecount != 1) { 2270 vprint("vputx: negative ref count", vp); 2271 panic("vputx: negative ref cnt"); 2272 } 2273 CTR2(KTR_VFS, "%s: return vnode %p to the freelist", __func__, vp); 2274 /* 2275 * We want to hold the vnode until the inactive finishes to 2276 * prevent vgone() races. We drop the use count here and the 2277 * hold count below when we're done. 2278 */ 2279 v_decr_useonly(vp); 2280 /* 2281 * We must call VOP_INACTIVE with the node locked. Mark 2282 * as VI_DOINGINACT to avoid recursion. 2283 */ 2284 vp->v_iflag |= VI_OWEINACT; 2285 switch (func) { 2286 case VPUTX_VRELE: 2287 error = vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK); 2288 VI_LOCK(vp); 2289 break; 2290 case VPUTX_VPUT: 2291 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 2292 error = VOP_LOCK(vp, LK_UPGRADE | LK_INTERLOCK | 2293 LK_NOWAIT); 2294 VI_LOCK(vp); 2295 } 2296 break; 2297 case VPUTX_VUNREF: 2298 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) { 2299 error = VOP_LOCK(vp, LK_TRYUPGRADE | LK_INTERLOCK); 2300 VI_LOCK(vp); 2301 } 2302 break; 2303 } 2304 if (vp->v_usecount > 0) 2305 vp->v_iflag &= ~VI_OWEINACT; 2306 if (error == 0) { 2307 if (vp->v_iflag & VI_OWEINACT) 2308 vinactive(vp, curthread); 2309 if (func != VPUTX_VUNREF) 2310 VOP_UNLOCK(vp, 0); 2311 } 2312 vdropl(vp); 2313 } 2314 2315 /* 2316 * Vnode put/release. 2317 * If count drops to zero, call inactive routine and return to freelist. 2318 */ 2319 void 2320 vrele(struct vnode *vp) 2321 { 2322 2323 vputx(vp, VPUTX_VRELE); 2324 } 2325 2326 /* 2327 * Release an already locked vnode. This give the same effects as 2328 * unlock+vrele(), but takes less time and avoids releasing and 2329 * re-aquiring the lock (as vrele() acquires the lock internally.) 2330 */ 2331 void 2332 vput(struct vnode *vp) 2333 { 2334 2335 vputx(vp, VPUTX_VPUT); 2336 } 2337 2338 /* 2339 * Release an exclusively locked vnode. Do not unlock the vnode lock. 2340 */ 2341 void 2342 vunref(struct vnode *vp) 2343 { 2344 2345 vputx(vp, VPUTX_VUNREF); 2346 } 2347 2348 /* 2349 * Somebody doesn't want the vnode recycled. 2350 */ 2351 void 2352 vhold(struct vnode *vp) 2353 { 2354 2355 VI_LOCK(vp); 2356 vholdl(vp); 2357 VI_UNLOCK(vp); 2358 } 2359 2360 /* 2361 * Increase the hold count and activate if this is the first reference. 2362 */ 2363 void 2364 vholdl(struct vnode *vp) 2365 { 2366 struct mount *mp; 2367 2368 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2369 #ifdef INVARIANTS 2370 /* getnewvnode() calls v_incr_usecount() without holding interlock. */ 2371 if (vp->v_type != VNON || vp->v_data != NULL) { 2372 ASSERT_VI_LOCKED(vp, "vholdl"); 2373 VNASSERT(vp->v_holdcnt > 0 || (vp->v_iflag & VI_FREE) != 0, 2374 vp, ("vholdl: free vnode is held")); 2375 } 2376 #endif 2377 vp->v_holdcnt++; 2378 if ((vp->v_iflag & VI_FREE) == 0) 2379 return; 2380 VNASSERT(vp->v_holdcnt == 1, vp, ("vholdl: wrong hold count")); 2381 VNASSERT(vp->v_op != NULL, vp, ("vholdl: vnode already reclaimed.")); 2382 /* 2383 * Remove a vnode from the free list, mark it as in use, 2384 * and put it on the active list. 2385 */ 2386 mtx_lock(&vnode_free_list_mtx); 2387 TAILQ_REMOVE(&vnode_free_list, vp, v_actfreelist); 2388 freevnodes--; 2389 vp->v_iflag &= ~(VI_FREE|VI_AGE); 2390 KASSERT((vp->v_iflag & VI_ACTIVE) == 0, 2391 ("Activating already active vnode")); 2392 vp->v_iflag |= VI_ACTIVE; 2393 mp = vp->v_mount; 2394 TAILQ_INSERT_HEAD(&mp->mnt_activevnodelist, vp, v_actfreelist); 2395 mp->mnt_activevnodelistsize++; 2396 mtx_unlock(&vnode_free_list_mtx); 2397 } 2398 2399 /* 2400 * Note that there is one less who cares about this vnode. 2401 * vdrop() is the opposite of vhold(). 2402 */ 2403 void 2404 vdrop(struct vnode *vp) 2405 { 2406 2407 VI_LOCK(vp); 2408 vdropl(vp); 2409 } 2410 2411 /* 2412 * Drop the hold count of the vnode. If this is the last reference to 2413 * the vnode we place it on the free list unless it has been vgone'd 2414 * (marked VI_DOOMED) in which case we will free it. 2415 */ 2416 void 2417 vdropl(struct vnode *vp) 2418 { 2419 struct bufobj *bo; 2420 struct mount *mp; 2421 int active; 2422 2423 ASSERT_VI_LOCKED(vp, "vdropl"); 2424 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2425 if (vp->v_holdcnt <= 0) 2426 panic("vdrop: holdcnt %d", vp->v_holdcnt); 2427 vp->v_holdcnt--; 2428 VNASSERT(vp->v_holdcnt >= vp->v_usecount, vp, 2429 ("hold count less than use count")); 2430 if (vp->v_holdcnt > 0) { 2431 VI_UNLOCK(vp); 2432 return; 2433 } 2434 if ((vp->v_iflag & VI_DOOMED) == 0) { 2435 /* 2436 * Mark a vnode as free: remove it from its active list 2437 * and put it up for recycling on the freelist. 2438 */ 2439 VNASSERT(vp->v_op != NULL, vp, 2440 ("vdropl: vnode already reclaimed.")); 2441 VNASSERT((vp->v_iflag & VI_FREE) == 0, vp, 2442 ("vnode already free")); 2443 VNASSERT(vp->v_holdcnt == 0, vp, 2444 ("vdropl: freeing when we shouldn't")); 2445 active = vp->v_iflag & VI_ACTIVE; 2446 vp->v_iflag &= ~VI_ACTIVE; 2447 mp = vp->v_mount; 2448 mtx_lock(&vnode_free_list_mtx); 2449 if (active) { 2450 TAILQ_REMOVE(&mp->mnt_activevnodelist, vp, 2451 v_actfreelist); 2452 mp->mnt_activevnodelistsize--; 2453 } 2454 if (vp->v_iflag & VI_AGE) { 2455 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_actfreelist); 2456 } else { 2457 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_actfreelist); 2458 } 2459 freevnodes++; 2460 vp->v_iflag &= ~VI_AGE; 2461 vp->v_iflag |= VI_FREE; 2462 mtx_unlock(&vnode_free_list_mtx); 2463 VI_UNLOCK(vp); 2464 return; 2465 } 2466 /* 2467 * The vnode has been marked for destruction, so free it. 2468 */ 2469 CTR2(KTR_VFS, "%s: destroying the vnode %p", __func__, vp); 2470 atomic_subtract_long(&numvnodes, 1); 2471 bo = &vp->v_bufobj; 2472 VNASSERT((vp->v_iflag & VI_FREE) == 0, vp, 2473 ("cleaned vnode still on the free list.")); 2474 VNASSERT(vp->v_data == NULL, vp, ("cleaned vnode isn't")); 2475 VNASSERT(vp->v_holdcnt == 0, vp, ("Non-zero hold count")); 2476 VNASSERT(vp->v_usecount == 0, vp, ("Non-zero use count")); 2477 VNASSERT(vp->v_writecount == 0, vp, ("Non-zero write count")); 2478 VNASSERT(bo->bo_numoutput == 0, vp, ("Clean vnode has pending I/O's")); 2479 VNASSERT(bo->bo_clean.bv_cnt == 0, vp, ("cleanbufcnt not 0")); 2480 VNASSERT(pctrie_is_empty(&bo->bo_clean.bv_root), vp, 2481 ("clean blk trie not empty")); 2482 VNASSERT(bo->bo_dirty.bv_cnt == 0, vp, ("dirtybufcnt not 0")); 2483 VNASSERT(pctrie_is_empty(&bo->bo_dirty.bv_root), vp, 2484 ("dirty blk trie not empty")); 2485 VNASSERT(TAILQ_EMPTY(&vp->v_cache_dst), vp, ("vp has namecache dst")); 2486 VNASSERT(LIST_EMPTY(&vp->v_cache_src), vp, ("vp has namecache src")); 2487 VNASSERT(vp->v_cache_dd == NULL, vp, ("vp has namecache for ..")); 2488 VI_UNLOCK(vp); 2489 #ifdef MAC 2490 mac_vnode_destroy(vp); 2491 #endif 2492 if (vp->v_pollinfo != NULL) 2493 destroy_vpollinfo(vp->v_pollinfo); 2494 #ifdef INVARIANTS 2495 /* XXX Elsewhere we detect an already freed vnode via NULL v_op. */ 2496 vp->v_op = NULL; 2497 #endif 2498 rangelock_destroy(&vp->v_rl); 2499 lockdestroy(vp->v_vnlock); 2500 mtx_destroy(&vp->v_interlock); 2501 rw_destroy(BO_LOCKPTR(bo)); 2502 uma_zfree(vnode_zone, vp); 2503 } 2504 2505 /* 2506 * Call VOP_INACTIVE on the vnode and manage the DOINGINACT and OWEINACT 2507 * flags. DOINGINACT prevents us from recursing in calls to vinactive. 2508 * OWEINACT tracks whether a vnode missed a call to inactive due to a 2509 * failed lock upgrade. 2510 */ 2511 void 2512 vinactive(struct vnode *vp, struct thread *td) 2513 { 2514 struct vm_object *obj; 2515 2516 ASSERT_VOP_ELOCKED(vp, "vinactive"); 2517 ASSERT_VI_LOCKED(vp, "vinactive"); 2518 VNASSERT((vp->v_iflag & VI_DOINGINACT) == 0, vp, 2519 ("vinactive: recursed on VI_DOINGINACT")); 2520 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2521 vp->v_iflag |= VI_DOINGINACT; 2522 vp->v_iflag &= ~VI_OWEINACT; 2523 VI_UNLOCK(vp); 2524 /* 2525 * Before moving off the active list, we must be sure that any 2526 * modified pages are on the vnode's dirty list since these will 2527 * no longer be checked once the vnode is on the inactive list. 2528 * Because the vnode vm object keeps a hold reference on the vnode 2529 * if there is at least one resident non-cached page, the vnode 2530 * cannot leave the active list without the page cleanup done. 2531 */ 2532 obj = vp->v_object; 2533 if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0) { 2534 VM_OBJECT_WLOCK(obj); 2535 vm_object_page_clean(obj, 0, 0, OBJPC_NOSYNC); 2536 VM_OBJECT_WUNLOCK(obj); 2537 } 2538 VOP_INACTIVE(vp, td); 2539 VI_LOCK(vp); 2540 VNASSERT(vp->v_iflag & VI_DOINGINACT, vp, 2541 ("vinactive: lost VI_DOINGINACT")); 2542 vp->v_iflag &= ~VI_DOINGINACT; 2543 } 2544 2545 /* 2546 * Remove any vnodes in the vnode table belonging to mount point mp. 2547 * 2548 * If FORCECLOSE is not specified, there should not be any active ones, 2549 * return error if any are found (nb: this is a user error, not a 2550 * system error). If FORCECLOSE is specified, detach any active vnodes 2551 * that are found. 2552 * 2553 * If WRITECLOSE is set, only flush out regular file vnodes open for 2554 * writing. 2555 * 2556 * SKIPSYSTEM causes any vnodes marked VV_SYSTEM to be skipped. 2557 * 2558 * `rootrefs' specifies the base reference count for the root vnode 2559 * of this filesystem. The root vnode is considered busy if its 2560 * v_usecount exceeds this value. On a successful return, vflush(, td) 2561 * will call vrele() on the root vnode exactly rootrefs times. 2562 * If the SKIPSYSTEM or WRITECLOSE flags are specified, rootrefs must 2563 * be zero. 2564 */ 2565 #ifdef DIAGNOSTIC 2566 static int busyprt = 0; /* print out busy vnodes */ 2567 SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, "Print out busy vnodes"); 2568 #endif 2569 2570 int 2571 vflush(struct mount *mp, int rootrefs, int flags, struct thread *td) 2572 { 2573 struct vnode *vp, *mvp, *rootvp = NULL; 2574 struct vattr vattr; 2575 int busy = 0, error; 2576 2577 CTR4(KTR_VFS, "%s: mp %p with rootrefs %d and flags %d", __func__, mp, 2578 rootrefs, flags); 2579 if (rootrefs > 0) { 2580 KASSERT((flags & (SKIPSYSTEM | WRITECLOSE)) == 0, 2581 ("vflush: bad args")); 2582 /* 2583 * Get the filesystem root vnode. We can vput() it 2584 * immediately, since with rootrefs > 0, it won't go away. 2585 */ 2586 if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rootvp)) != 0) { 2587 CTR2(KTR_VFS, "%s: vfs_root lookup failed with %d", 2588 __func__, error); 2589 return (error); 2590 } 2591 vput(rootvp); 2592 } 2593 loop: 2594 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 2595 vholdl(vp); 2596 error = vn_lock(vp, LK_INTERLOCK | LK_EXCLUSIVE); 2597 if (error) { 2598 vdrop(vp); 2599 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 2600 goto loop; 2601 } 2602 /* 2603 * Skip over a vnodes marked VV_SYSTEM. 2604 */ 2605 if ((flags & SKIPSYSTEM) && (vp->v_vflag & VV_SYSTEM)) { 2606 VOP_UNLOCK(vp, 0); 2607 vdrop(vp); 2608 continue; 2609 } 2610 /* 2611 * If WRITECLOSE is set, flush out unlinked but still open 2612 * files (even if open only for reading) and regular file 2613 * vnodes open for writing. 2614 */ 2615 if (flags & WRITECLOSE) { 2616 if (vp->v_object != NULL) { 2617 VM_OBJECT_WLOCK(vp->v_object); 2618 vm_object_page_clean(vp->v_object, 0, 0, 0); 2619 VM_OBJECT_WUNLOCK(vp->v_object); 2620 } 2621 error = VOP_FSYNC(vp, MNT_WAIT, td); 2622 if (error != 0) { 2623 VOP_UNLOCK(vp, 0); 2624 vdrop(vp); 2625 MNT_VNODE_FOREACH_ALL_ABORT(mp, mvp); 2626 return (error); 2627 } 2628 error = VOP_GETATTR(vp, &vattr, td->td_ucred); 2629 VI_LOCK(vp); 2630 2631 if ((vp->v_type == VNON || 2632 (error == 0 && vattr.va_nlink > 0)) && 2633 (vp->v_writecount == 0 || vp->v_type != VREG)) { 2634 VOP_UNLOCK(vp, 0); 2635 vdropl(vp); 2636 continue; 2637 } 2638 } else 2639 VI_LOCK(vp); 2640 /* 2641 * With v_usecount == 0, all we need to do is clear out the 2642 * vnode data structures and we are done. 2643 * 2644 * If FORCECLOSE is set, forcibly close the vnode. 2645 */ 2646 if (vp->v_usecount == 0 || (flags & FORCECLOSE)) { 2647 VNASSERT(vp->v_usecount == 0 || 2648 (vp->v_type != VCHR && vp->v_type != VBLK), vp, 2649 ("device VNODE %p is FORCECLOSED", vp)); 2650 vgonel(vp); 2651 } else { 2652 busy++; 2653 #ifdef DIAGNOSTIC 2654 if (busyprt) 2655 vprint("vflush: busy vnode", vp); 2656 #endif 2657 } 2658 VOP_UNLOCK(vp, 0); 2659 vdropl(vp); 2660 } 2661 if (rootrefs > 0 && (flags & FORCECLOSE) == 0) { 2662 /* 2663 * If just the root vnode is busy, and if its refcount 2664 * is equal to `rootrefs', then go ahead and kill it. 2665 */ 2666 VI_LOCK(rootvp); 2667 KASSERT(busy > 0, ("vflush: not busy")); 2668 VNASSERT(rootvp->v_usecount >= rootrefs, rootvp, 2669 ("vflush: usecount %d < rootrefs %d", 2670 rootvp->v_usecount, rootrefs)); 2671 if (busy == 1 && rootvp->v_usecount == rootrefs) { 2672 VOP_LOCK(rootvp, LK_EXCLUSIVE|LK_INTERLOCK); 2673 vgone(rootvp); 2674 VOP_UNLOCK(rootvp, 0); 2675 busy = 0; 2676 } else 2677 VI_UNLOCK(rootvp); 2678 } 2679 if (busy) { 2680 CTR2(KTR_VFS, "%s: failing as %d vnodes are busy", __func__, 2681 busy); 2682 return (EBUSY); 2683 } 2684 for (; rootrefs > 0; rootrefs--) 2685 vrele(rootvp); 2686 return (0); 2687 } 2688 2689 /* 2690 * Recycle an unused vnode to the front of the free list. 2691 */ 2692 int 2693 vrecycle(struct vnode *vp) 2694 { 2695 int recycled; 2696 2697 ASSERT_VOP_ELOCKED(vp, "vrecycle"); 2698 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2699 recycled = 0; 2700 VI_LOCK(vp); 2701 if (vp->v_usecount == 0) { 2702 recycled = 1; 2703 vgonel(vp); 2704 } 2705 VI_UNLOCK(vp); 2706 return (recycled); 2707 } 2708 2709 /* 2710 * Eliminate all activity associated with a vnode 2711 * in preparation for reuse. 2712 */ 2713 void 2714 vgone(struct vnode *vp) 2715 { 2716 VI_LOCK(vp); 2717 vgonel(vp); 2718 VI_UNLOCK(vp); 2719 } 2720 2721 static void 2722 notify_lowervp_vfs_dummy(struct mount *mp __unused, 2723 struct vnode *lowervp __unused) 2724 { 2725 } 2726 2727 /* 2728 * Notify upper mounts about reclaimed or unlinked vnode. 2729 */ 2730 void 2731 vfs_notify_upper(struct vnode *vp, int event) 2732 { 2733 static struct vfsops vgonel_vfsops = { 2734 .vfs_reclaim_lowervp = notify_lowervp_vfs_dummy, 2735 .vfs_unlink_lowervp = notify_lowervp_vfs_dummy, 2736 }; 2737 struct mount *mp, *ump, *mmp; 2738 2739 mp = vp->v_mount; 2740 if (mp == NULL) 2741 return; 2742 2743 MNT_ILOCK(mp); 2744 if (TAILQ_EMPTY(&mp->mnt_uppers)) 2745 goto unlock; 2746 MNT_IUNLOCK(mp); 2747 mmp = malloc(sizeof(struct mount), M_TEMP, M_WAITOK | M_ZERO); 2748 mmp->mnt_op = &vgonel_vfsops; 2749 mmp->mnt_kern_flag |= MNTK_MARKER; 2750 MNT_ILOCK(mp); 2751 mp->mnt_kern_flag |= MNTK_VGONE_UPPER; 2752 for (ump = TAILQ_FIRST(&mp->mnt_uppers); ump != NULL;) { 2753 if ((ump->mnt_kern_flag & MNTK_MARKER) != 0) { 2754 ump = TAILQ_NEXT(ump, mnt_upper_link); 2755 continue; 2756 } 2757 TAILQ_INSERT_AFTER(&mp->mnt_uppers, ump, mmp, mnt_upper_link); 2758 MNT_IUNLOCK(mp); 2759 switch (event) { 2760 case VFS_NOTIFY_UPPER_RECLAIM: 2761 VFS_RECLAIM_LOWERVP(ump, vp); 2762 break; 2763 case VFS_NOTIFY_UPPER_UNLINK: 2764 VFS_UNLINK_LOWERVP(ump, vp); 2765 break; 2766 default: 2767 KASSERT(0, ("invalid event %d", event)); 2768 break; 2769 } 2770 MNT_ILOCK(mp); 2771 ump = TAILQ_NEXT(mmp, mnt_upper_link); 2772 TAILQ_REMOVE(&mp->mnt_uppers, mmp, mnt_upper_link); 2773 } 2774 free(mmp, M_TEMP); 2775 mp->mnt_kern_flag &= ~MNTK_VGONE_UPPER; 2776 if ((mp->mnt_kern_flag & MNTK_VGONE_WAITER) != 0) { 2777 mp->mnt_kern_flag &= ~MNTK_VGONE_WAITER; 2778 wakeup(&mp->mnt_uppers); 2779 } 2780 unlock: 2781 MNT_IUNLOCK(mp); 2782 } 2783 2784 /* 2785 * vgone, with the vp interlock held. 2786 */ 2787 void 2788 vgonel(struct vnode *vp) 2789 { 2790 struct thread *td; 2791 int oweinact; 2792 int active; 2793 struct mount *mp; 2794 2795 ASSERT_VOP_ELOCKED(vp, "vgonel"); 2796 ASSERT_VI_LOCKED(vp, "vgonel"); 2797 VNASSERT(vp->v_holdcnt, vp, 2798 ("vgonel: vp %p has no reference.", vp)); 2799 CTR2(KTR_VFS, "%s: vp %p", __func__, vp); 2800 td = curthread; 2801 2802 /* 2803 * Don't vgonel if we're already doomed. 2804 */ 2805 if (vp->v_iflag & VI_DOOMED) 2806 return; 2807 vp->v_iflag |= VI_DOOMED; 2808 2809 /* 2810 * Check to see if the vnode is in use. If so, we have to call 2811 * VOP_CLOSE() and VOP_INACTIVE(). 2812 */ 2813 active = vp->v_usecount; 2814 oweinact = (vp->v_iflag & VI_OWEINACT); 2815 VI_UNLOCK(vp); 2816 vfs_notify_upper(vp, VFS_NOTIFY_UPPER_RECLAIM); 2817 2818 /* 2819 * If purging an active vnode, it must be closed and 2820 * deactivated before being reclaimed. 2821 */ 2822 if (active) 2823 VOP_CLOSE(vp, FNONBLOCK, NOCRED, td); 2824 if (oweinact || active) { 2825 VI_LOCK(vp); 2826 if ((vp->v_iflag & VI_DOINGINACT) == 0) 2827 vinactive(vp, td); 2828 VI_UNLOCK(vp); 2829 } 2830 if (vp->v_type == VSOCK) 2831 vfs_unp_reclaim(vp); 2832 2833 /* 2834 * Clean out any buffers associated with the vnode. 2835 * If the flush fails, just toss the buffers. 2836 */ 2837 mp = NULL; 2838 if (!TAILQ_EMPTY(&vp->v_bufobj.bo_dirty.bv_hd)) 2839 (void) vn_start_secondary_write(vp, &mp, V_WAIT); 2840 if (vinvalbuf(vp, V_SAVE, 0, 0) != 0) { 2841 while (vinvalbuf(vp, 0, 0, 0) != 0) 2842 ; 2843 } 2844 #ifdef INVARIANTS 2845 BO_LOCK(&vp->v_bufobj); 2846 KASSERT(TAILQ_EMPTY(&vp->v_bufobj.bo_dirty.bv_hd) && 2847 vp->v_bufobj.bo_dirty.bv_cnt == 0 && 2848 TAILQ_EMPTY(&vp->v_bufobj.bo_clean.bv_hd) && 2849 vp->v_bufobj.bo_clean.bv_cnt == 0, 2850 ("vp %p bufobj not invalidated", vp)); 2851 vp->v_bufobj.bo_flag |= BO_DEAD; 2852 BO_UNLOCK(&vp->v_bufobj); 2853 #endif 2854 2855 /* 2856 * Reclaim the vnode. 2857 */ 2858 if (VOP_RECLAIM(vp, td)) 2859 panic("vgone: cannot reclaim"); 2860 if (mp != NULL) 2861 vn_finished_secondary_write(mp); 2862 VNASSERT(vp->v_object == NULL, vp, 2863 ("vop_reclaim left v_object vp=%p, tag=%s", vp, vp->v_tag)); 2864 /* 2865 * Clear the advisory locks and wake up waiting threads. 2866 */ 2867 (void)VOP_ADVLOCKPURGE(vp); 2868 /* 2869 * Delete from old mount point vnode list. 2870 */ 2871 delmntque(vp); 2872 cache_purge(vp); 2873 /* 2874 * Done with purge, reset to the standard lock and invalidate 2875 * the vnode. 2876 */ 2877 VI_LOCK(vp); 2878 vp->v_vnlock = &vp->v_lock; 2879 vp->v_op = &dead_vnodeops; 2880 vp->v_tag = "none"; 2881 vp->v_type = VBAD; 2882 } 2883 2884 /* 2885 * Calculate the total number of references to a special device. 2886 */ 2887 int 2888 vcount(struct vnode *vp) 2889 { 2890 int count; 2891 2892 dev_lock(); 2893 count = vp->v_rdev->si_usecount; 2894 dev_unlock(); 2895 return (count); 2896 } 2897 2898 /* 2899 * Same as above, but using the struct cdev *as argument 2900 */ 2901 int 2902 count_dev(struct cdev *dev) 2903 { 2904 int count; 2905 2906 dev_lock(); 2907 count = dev->si_usecount; 2908 dev_unlock(); 2909 return(count); 2910 } 2911 2912 /* 2913 * Print out a description of a vnode. 2914 */ 2915 static char *typename[] = 2916 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD", 2917 "VMARKER"}; 2918 2919 void 2920 vn_printf(struct vnode *vp, const char *fmt, ...) 2921 { 2922 va_list ap; 2923 char buf[256], buf2[16]; 2924 u_long flags; 2925 2926 va_start(ap, fmt); 2927 vprintf(fmt, ap); 2928 va_end(ap); 2929 printf("%p: ", (void *)vp); 2930 printf("tag %s, type %s\n", vp->v_tag, typename[vp->v_type]); 2931 printf(" usecount %d, writecount %d, refcount %d mountedhere %p\n", 2932 vp->v_usecount, vp->v_writecount, vp->v_holdcnt, vp->v_mountedhere); 2933 buf[0] = '\0'; 2934 buf[1] = '\0'; 2935 if (vp->v_vflag & VV_ROOT) 2936 strlcat(buf, "|VV_ROOT", sizeof(buf)); 2937 if (vp->v_vflag & VV_ISTTY) 2938 strlcat(buf, "|VV_ISTTY", sizeof(buf)); 2939 if (vp->v_vflag & VV_NOSYNC) 2940 strlcat(buf, "|VV_NOSYNC", sizeof(buf)); 2941 if (vp->v_vflag & VV_ETERNALDEV) 2942 strlcat(buf, "|VV_ETERNALDEV", sizeof(buf)); 2943 if (vp->v_vflag & VV_CACHEDLABEL) 2944 strlcat(buf, "|VV_CACHEDLABEL", sizeof(buf)); 2945 if (vp->v_vflag & VV_TEXT) 2946 strlcat(buf, "|VV_TEXT", sizeof(buf)); 2947 if (vp->v_vflag & VV_COPYONWRITE) 2948 strlcat(buf, "|VV_COPYONWRITE", sizeof(buf)); 2949 if (vp->v_vflag & VV_SYSTEM) 2950 strlcat(buf, "|VV_SYSTEM", sizeof(buf)); 2951 if (vp->v_vflag & VV_PROCDEP) 2952 strlcat(buf, "|VV_PROCDEP", sizeof(buf)); 2953 if (vp->v_vflag & VV_NOKNOTE) 2954 strlcat(buf, "|VV_NOKNOTE", sizeof(buf)); 2955 if (vp->v_vflag & VV_DELETED) 2956 strlcat(buf, "|VV_DELETED", sizeof(buf)); 2957 if (vp->v_vflag & VV_MD) 2958 strlcat(buf, "|VV_MD", sizeof(buf)); 2959 if (vp->v_vflag & VV_FORCEINSMQ) 2960 strlcat(buf, "|VV_FORCEINSMQ", sizeof(buf)); 2961 flags = vp->v_vflag & ~(VV_ROOT | VV_ISTTY | VV_NOSYNC | VV_ETERNALDEV | 2962 VV_CACHEDLABEL | VV_TEXT | VV_COPYONWRITE | VV_SYSTEM | VV_PROCDEP | 2963 VV_NOKNOTE | VV_DELETED | VV_MD | VV_FORCEINSMQ); 2964 if (flags != 0) { 2965 snprintf(buf2, sizeof(buf2), "|VV(0x%lx)", flags); 2966 strlcat(buf, buf2, sizeof(buf)); 2967 } 2968 if (vp->v_iflag & VI_MOUNT) 2969 strlcat(buf, "|VI_MOUNT", sizeof(buf)); 2970 if (vp->v_iflag & VI_AGE) 2971 strlcat(buf, "|VI_AGE", sizeof(buf)); 2972 if (vp->v_iflag & VI_DOOMED) 2973 strlcat(buf, "|VI_DOOMED", sizeof(buf)); 2974 if (vp->v_iflag & VI_FREE) 2975 strlcat(buf, "|VI_FREE", sizeof(buf)); 2976 if (vp->v_iflag & VI_ACTIVE) 2977 strlcat(buf, "|VI_ACTIVE", sizeof(buf)); 2978 if (vp->v_iflag & VI_DOINGINACT) 2979 strlcat(buf, "|VI_DOINGINACT", sizeof(buf)); 2980 if (vp->v_iflag & VI_OWEINACT) 2981 strlcat(buf, "|VI_OWEINACT", sizeof(buf)); 2982 flags = vp->v_iflag & ~(VI_MOUNT | VI_AGE | VI_DOOMED | VI_FREE | 2983 VI_ACTIVE | VI_DOINGINACT | VI_OWEINACT); 2984 if (flags != 0) { 2985 snprintf(buf2, sizeof(buf2), "|VI(0x%lx)", flags); 2986 strlcat(buf, buf2, sizeof(buf)); 2987 } 2988 printf(" flags (%s)\n", buf + 1); 2989 if (mtx_owned(VI_MTX(vp))) 2990 printf(" VI_LOCKed"); 2991 if (vp->v_object != NULL) 2992 printf(" v_object %p ref %d pages %d " 2993 "cleanbuf %d dirtybuf %d\n", 2994 vp->v_object, vp->v_object->ref_count, 2995 vp->v_object->resident_page_count, 2996 vp->v_bufobj.bo_dirty.bv_cnt, 2997 vp->v_bufobj.bo_clean.bv_cnt); 2998 printf(" "); 2999 lockmgr_printinfo(vp->v_vnlock); 3000 if (vp->v_data != NULL) 3001 VOP_PRINT(vp); 3002 } 3003 3004 #ifdef DDB 3005 /* 3006 * List all of the locked vnodes in the system. 3007 * Called when debugging the kernel. 3008 */ 3009 DB_SHOW_COMMAND(lockedvnods, lockedvnodes) 3010 { 3011 struct mount *mp; 3012 struct vnode *vp; 3013 3014 /* 3015 * Note: because this is DDB, we can't obey the locking semantics 3016 * for these structures, which means we could catch an inconsistent 3017 * state and dereference a nasty pointer. Not much to be done 3018 * about that. 3019 */ 3020 db_printf("Locked vnodes\n"); 3021 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 3022 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { 3023 if (vp->v_type != VMARKER && VOP_ISLOCKED(vp)) 3024 vprint("", vp); 3025 } 3026 } 3027 } 3028 3029 /* 3030 * Show details about the given vnode. 3031 */ 3032 DB_SHOW_COMMAND(vnode, db_show_vnode) 3033 { 3034 struct vnode *vp; 3035 3036 if (!have_addr) 3037 return; 3038 vp = (struct vnode *)addr; 3039 vn_printf(vp, "vnode "); 3040 } 3041 3042 /* 3043 * Show details about the given mount point. 3044 */ 3045 DB_SHOW_COMMAND(mount, db_show_mount) 3046 { 3047 struct mount *mp; 3048 struct vfsopt *opt; 3049 struct statfs *sp; 3050 struct vnode *vp; 3051 char buf[512]; 3052 uint64_t mflags; 3053 u_int flags; 3054 3055 if (!have_addr) { 3056 /* No address given, print short info about all mount points. */ 3057 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 3058 db_printf("%p %s on %s (%s)\n", mp, 3059 mp->mnt_stat.f_mntfromname, 3060 mp->mnt_stat.f_mntonname, 3061 mp->mnt_stat.f_fstypename); 3062 if (db_pager_quit) 3063 break; 3064 } 3065 db_printf("\nMore info: show mount <addr>\n"); 3066 return; 3067 } 3068 3069 mp = (struct mount *)addr; 3070 db_printf("%p %s on %s (%s)\n", mp, mp->mnt_stat.f_mntfromname, 3071 mp->mnt_stat.f_mntonname, mp->mnt_stat.f_fstypename); 3072 3073 buf[0] = '\0'; 3074 mflags = mp->mnt_flag; 3075 #define MNT_FLAG(flag) do { \ 3076 if (mflags & (flag)) { \ 3077 if (buf[0] != '\0') \ 3078 strlcat(buf, ", ", sizeof(buf)); \ 3079 strlcat(buf, (#flag) + 4, sizeof(buf)); \ 3080 mflags &= ~(flag); \ 3081 } \ 3082 } while (0) 3083 MNT_FLAG(MNT_RDONLY); 3084 MNT_FLAG(MNT_SYNCHRONOUS); 3085 MNT_FLAG(MNT_NOEXEC); 3086 MNT_FLAG(MNT_NOSUID); 3087 MNT_FLAG(MNT_NFS4ACLS); 3088 MNT_FLAG(MNT_UNION); 3089 MNT_FLAG(MNT_ASYNC); 3090 MNT_FLAG(MNT_SUIDDIR); 3091 MNT_FLAG(MNT_SOFTDEP); 3092 MNT_FLAG(MNT_NOSYMFOLLOW); 3093 MNT_FLAG(MNT_GJOURNAL); 3094 MNT_FLAG(MNT_MULTILABEL); 3095 MNT_FLAG(MNT_ACLS); 3096 MNT_FLAG(MNT_NOATIME); 3097 MNT_FLAG(MNT_NOCLUSTERR); 3098 MNT_FLAG(MNT_NOCLUSTERW); 3099 MNT_FLAG(MNT_SUJ); 3100 MNT_FLAG(MNT_EXRDONLY); 3101 MNT_FLAG(MNT_EXPORTED); 3102 MNT_FLAG(MNT_DEFEXPORTED); 3103 MNT_FLAG(MNT_EXPORTANON); 3104 MNT_FLAG(MNT_EXKERB); 3105 MNT_FLAG(MNT_EXPUBLIC); 3106 MNT_FLAG(MNT_LOCAL); 3107 MNT_FLAG(MNT_QUOTA); 3108 MNT_FLAG(MNT_ROOTFS); 3109 MNT_FLAG(MNT_USER); 3110 MNT_FLAG(MNT_IGNORE); 3111 MNT_FLAG(MNT_UPDATE); 3112 MNT_FLAG(MNT_DELEXPORT); 3113 MNT_FLAG(MNT_RELOAD); 3114 MNT_FLAG(MNT_FORCE); 3115 MNT_FLAG(MNT_SNAPSHOT); 3116 MNT_FLAG(MNT_BYFSID); 3117 #undef MNT_FLAG 3118 if (mflags != 0) { 3119 if (buf[0] != '\0') 3120 strlcat(buf, ", ", sizeof(buf)); 3121 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), 3122 "0x%016jx", mflags); 3123 } 3124 db_printf(" mnt_flag = %s\n", buf); 3125 3126 buf[0] = '\0'; 3127 flags = mp->mnt_kern_flag; 3128 #define MNT_KERN_FLAG(flag) do { \ 3129 if (flags & (flag)) { \ 3130 if (buf[0] != '\0') \ 3131 strlcat(buf, ", ", sizeof(buf)); \ 3132 strlcat(buf, (#flag) + 5, sizeof(buf)); \ 3133 flags &= ~(flag); \ 3134 } \ 3135 } while (0) 3136 MNT_KERN_FLAG(MNTK_UNMOUNTF); 3137 MNT_KERN_FLAG(MNTK_ASYNC); 3138 MNT_KERN_FLAG(MNTK_SOFTDEP); 3139 MNT_KERN_FLAG(MNTK_NOINSMNTQ); 3140 MNT_KERN_FLAG(MNTK_DRAINING); 3141 MNT_KERN_FLAG(MNTK_REFEXPIRE); 3142 MNT_KERN_FLAG(MNTK_EXTENDED_SHARED); 3143 MNT_KERN_FLAG(MNTK_SHARED_WRITES); 3144 MNT_KERN_FLAG(MNTK_NO_IOPF); 3145 MNT_KERN_FLAG(MNTK_VGONE_UPPER); 3146 MNT_KERN_FLAG(MNTK_VGONE_WAITER); 3147 MNT_KERN_FLAG(MNTK_LOOKUP_EXCL_DOTDOT); 3148 MNT_KERN_FLAG(MNTK_MARKER); 3149 MNT_KERN_FLAG(MNTK_NOASYNC); 3150 MNT_KERN_FLAG(MNTK_UNMOUNT); 3151 MNT_KERN_FLAG(MNTK_MWAIT); 3152 MNT_KERN_FLAG(MNTK_SUSPEND); 3153 MNT_KERN_FLAG(MNTK_SUSPEND2); 3154 MNT_KERN_FLAG(MNTK_SUSPENDED); 3155 MNT_KERN_FLAG(MNTK_LOOKUP_SHARED); 3156 MNT_KERN_FLAG(MNTK_NOKNOTE); 3157 #undef MNT_KERN_FLAG 3158 if (flags != 0) { 3159 if (buf[0] != '\0') 3160 strlcat(buf, ", ", sizeof(buf)); 3161 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), 3162 "0x%08x", flags); 3163 } 3164 db_printf(" mnt_kern_flag = %s\n", buf); 3165 3166 db_printf(" mnt_opt = "); 3167 opt = TAILQ_FIRST(mp->mnt_opt); 3168 if (opt != NULL) { 3169 db_printf("%s", opt->name); 3170 opt = TAILQ_NEXT(opt, link); 3171 while (opt != NULL) { 3172 db_printf(", %s", opt->name); 3173 opt = TAILQ_NEXT(opt, link); 3174 } 3175 } 3176 db_printf("\n"); 3177 3178 sp = &mp->mnt_stat; 3179 db_printf(" mnt_stat = { version=%u type=%u flags=0x%016jx " 3180 "bsize=%ju iosize=%ju blocks=%ju bfree=%ju bavail=%jd files=%ju " 3181 "ffree=%jd syncwrites=%ju asyncwrites=%ju syncreads=%ju " 3182 "asyncreads=%ju namemax=%u owner=%u fsid=[%d, %d] }\n", 3183 (u_int)sp->f_version, (u_int)sp->f_type, (uintmax_t)sp->f_flags, 3184 (uintmax_t)sp->f_bsize, (uintmax_t)sp->f_iosize, 3185 (uintmax_t)sp->f_blocks, (uintmax_t)sp->f_bfree, 3186 (intmax_t)sp->f_bavail, (uintmax_t)sp->f_files, 3187 (intmax_t)sp->f_ffree, (uintmax_t)sp->f_syncwrites, 3188 (uintmax_t)sp->f_asyncwrites, (uintmax_t)sp->f_syncreads, 3189 (uintmax_t)sp->f_asyncreads, (u_int)sp->f_namemax, 3190 (u_int)sp->f_owner, (int)sp->f_fsid.val[0], (int)sp->f_fsid.val[1]); 3191 3192 db_printf(" mnt_cred = { uid=%u ruid=%u", 3193 (u_int)mp->mnt_cred->cr_uid, (u_int)mp->mnt_cred->cr_ruid); 3194 if (jailed(mp->mnt_cred)) 3195 db_printf(", jail=%d", mp->mnt_cred->cr_prison->pr_id); 3196 db_printf(" }\n"); 3197 db_printf(" mnt_ref = %d\n", mp->mnt_ref); 3198 db_printf(" mnt_gen = %d\n", mp->mnt_gen); 3199 db_printf(" mnt_nvnodelistsize = %d\n", mp->mnt_nvnodelistsize); 3200 db_printf(" mnt_activevnodelistsize = %d\n", 3201 mp->mnt_activevnodelistsize); 3202 db_printf(" mnt_writeopcount = %d\n", mp->mnt_writeopcount); 3203 db_printf(" mnt_maxsymlinklen = %d\n", mp->mnt_maxsymlinklen); 3204 db_printf(" mnt_iosize_max = %d\n", mp->mnt_iosize_max); 3205 db_printf(" mnt_hashseed = %u\n", mp->mnt_hashseed); 3206 db_printf(" mnt_lockref = %d\n", mp->mnt_lockref); 3207 db_printf(" mnt_secondary_writes = %d\n", mp->mnt_secondary_writes); 3208 db_printf(" mnt_secondary_accwrites = %d\n", 3209 mp->mnt_secondary_accwrites); 3210 db_printf(" mnt_gjprovider = %s\n", 3211 mp->mnt_gjprovider != NULL ? mp->mnt_gjprovider : "NULL"); 3212 3213 db_printf("\n\nList of active vnodes\n"); 3214 TAILQ_FOREACH(vp, &mp->mnt_activevnodelist, v_actfreelist) { 3215 if (vp->v_type != VMARKER) { 3216 vn_printf(vp, "vnode "); 3217 if (db_pager_quit) 3218 break; 3219 } 3220 } 3221 db_printf("\n\nList of inactive vnodes\n"); 3222 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { 3223 if (vp->v_type != VMARKER && (vp->v_iflag & VI_ACTIVE) == 0) { 3224 vn_printf(vp, "vnode "); 3225 if (db_pager_quit) 3226 break; 3227 } 3228 } 3229 } 3230 #endif /* DDB */ 3231 3232 /* 3233 * Fill in a struct xvfsconf based on a struct vfsconf. 3234 */ 3235 static int 3236 vfsconf2x(struct sysctl_req *req, struct vfsconf *vfsp) 3237 { 3238 struct xvfsconf xvfsp; 3239 3240 bzero(&xvfsp, sizeof(xvfsp)); 3241 strcpy(xvfsp.vfc_name, vfsp->vfc_name); 3242 xvfsp.vfc_typenum = vfsp->vfc_typenum; 3243 xvfsp.vfc_refcount = vfsp->vfc_refcount; 3244 xvfsp.vfc_flags = vfsp->vfc_flags; 3245 /* 3246 * These are unused in userland, we keep them 3247 * to not break binary compatibility. 3248 */ 3249 xvfsp.vfc_vfsops = NULL; 3250 xvfsp.vfc_next = NULL; 3251 return (SYSCTL_OUT(req, &xvfsp, sizeof(xvfsp))); 3252 } 3253 3254 #ifdef COMPAT_FREEBSD32 3255 struct xvfsconf32 { 3256 uint32_t vfc_vfsops; 3257 char vfc_name[MFSNAMELEN]; 3258 int32_t vfc_typenum; 3259 int32_t vfc_refcount; 3260 int32_t vfc_flags; 3261 uint32_t vfc_next; 3262 }; 3263 3264 static int 3265 vfsconf2x32(struct sysctl_req *req, struct vfsconf *vfsp) 3266 { 3267 struct xvfsconf32 xvfsp; 3268 3269 strcpy(xvfsp.vfc_name, vfsp->vfc_name); 3270 xvfsp.vfc_typenum = vfsp->vfc_typenum; 3271 xvfsp.vfc_refcount = vfsp->vfc_refcount; 3272 xvfsp.vfc_flags = vfsp->vfc_flags; 3273 xvfsp.vfc_vfsops = 0; 3274 xvfsp.vfc_next = 0; 3275 return (SYSCTL_OUT(req, &xvfsp, sizeof(xvfsp))); 3276 } 3277 #endif 3278 3279 /* 3280 * Top level filesystem related information gathering. 3281 */ 3282 static int 3283 sysctl_vfs_conflist(SYSCTL_HANDLER_ARGS) 3284 { 3285 struct vfsconf *vfsp; 3286 int error; 3287 3288 error = 0; 3289 vfsconf_slock(); 3290 TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) { 3291 #ifdef COMPAT_FREEBSD32 3292 if (req->flags & SCTL_MASK32) 3293 error = vfsconf2x32(req, vfsp); 3294 else 3295 #endif 3296 error = vfsconf2x(req, vfsp); 3297 if (error) 3298 break; 3299 } 3300 vfsconf_sunlock(); 3301 return (error); 3302 } 3303 3304 SYSCTL_PROC(_vfs, OID_AUTO, conflist, CTLTYPE_OPAQUE | CTLFLAG_RD | 3305 CTLFLAG_MPSAFE, NULL, 0, sysctl_vfs_conflist, 3306 "S,xvfsconf", "List of all configured filesystems"); 3307 3308 #ifndef BURN_BRIDGES 3309 static int sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS); 3310 3311 static int 3312 vfs_sysctl(SYSCTL_HANDLER_ARGS) 3313 { 3314 int *name = (int *)arg1 - 1; /* XXX */ 3315 u_int namelen = arg2 + 1; /* XXX */ 3316 struct vfsconf *vfsp; 3317 3318 log(LOG_WARNING, "userland calling deprecated sysctl, " 3319 "please rebuild world\n"); 3320 3321 #if 1 || defined(COMPAT_PRELITE2) 3322 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ 3323 if (namelen == 1) 3324 return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); 3325 #endif 3326 3327 switch (name[1]) { 3328 case VFS_MAXTYPENUM: 3329 if (namelen != 2) 3330 return (ENOTDIR); 3331 return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); 3332 case VFS_CONF: 3333 if (namelen != 3) 3334 return (ENOTDIR); /* overloaded */ 3335 vfsconf_slock(); 3336 TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) { 3337 if (vfsp->vfc_typenum == name[2]) 3338 break; 3339 } 3340 vfsconf_sunlock(); 3341 if (vfsp == NULL) 3342 return (EOPNOTSUPP); 3343 #ifdef COMPAT_FREEBSD32 3344 if (req->flags & SCTL_MASK32) 3345 return (vfsconf2x32(req, vfsp)); 3346 else 3347 #endif 3348 return (vfsconf2x(req, vfsp)); 3349 } 3350 return (EOPNOTSUPP); 3351 } 3352 3353 static SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD | CTLFLAG_SKIP | 3354 CTLFLAG_MPSAFE, vfs_sysctl, 3355 "Generic filesystem"); 3356 3357 #if 1 || defined(COMPAT_PRELITE2) 3358 3359 static int 3360 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) 3361 { 3362 int error; 3363 struct vfsconf *vfsp; 3364 struct ovfsconf ovfs; 3365 3366 vfsconf_slock(); 3367 TAILQ_FOREACH(vfsp, &vfsconf, vfc_list) { 3368 bzero(&ovfs, sizeof(ovfs)); 3369 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ 3370 strcpy(ovfs.vfc_name, vfsp->vfc_name); 3371 ovfs.vfc_index = vfsp->vfc_typenum; 3372 ovfs.vfc_refcount = vfsp->vfc_refcount; 3373 ovfs.vfc_flags = vfsp->vfc_flags; 3374 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); 3375 if (error != 0) { 3376 vfsconf_sunlock(); 3377 return (error); 3378 } 3379 } 3380 vfsconf_sunlock(); 3381 return (0); 3382 } 3383 3384 #endif /* 1 || COMPAT_PRELITE2 */ 3385 #endif /* !BURN_BRIDGES */ 3386 3387 #define KINFO_VNODESLOP 10 3388 #ifdef notyet 3389 /* 3390 * Dump vnode list (via sysctl). 3391 */ 3392 /* ARGSUSED */ 3393 static int 3394 sysctl_vnode(SYSCTL_HANDLER_ARGS) 3395 { 3396 struct xvnode *xvn; 3397 struct mount *mp; 3398 struct vnode *vp; 3399 int error, len, n; 3400 3401 /* 3402 * Stale numvnodes access is not fatal here. 3403 */ 3404 req->lock = 0; 3405 len = (numvnodes + KINFO_VNODESLOP) * sizeof *xvn; 3406 if (!req->oldptr) 3407 /* Make an estimate */ 3408 return (SYSCTL_OUT(req, 0, len)); 3409 3410 error = sysctl_wire_old_buffer(req, 0); 3411 if (error != 0) 3412 return (error); 3413 xvn = malloc(len, M_TEMP, M_ZERO | M_WAITOK); 3414 n = 0; 3415 mtx_lock(&mountlist_mtx); 3416 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 3417 if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK)) 3418 continue; 3419 MNT_ILOCK(mp); 3420 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { 3421 if (n == len) 3422 break; 3423 vref(vp); 3424 xvn[n].xv_size = sizeof *xvn; 3425 xvn[n].xv_vnode = vp; 3426 xvn[n].xv_id = 0; /* XXX compat */ 3427 #define XV_COPY(field) xvn[n].xv_##field = vp->v_##field 3428 XV_COPY(usecount); 3429 XV_COPY(writecount); 3430 XV_COPY(holdcnt); 3431 XV_COPY(mount); 3432 XV_COPY(numoutput); 3433 XV_COPY(type); 3434 #undef XV_COPY 3435 xvn[n].xv_flag = vp->v_vflag; 3436 3437 switch (vp->v_type) { 3438 case VREG: 3439 case VDIR: 3440 case VLNK: 3441 break; 3442 case VBLK: 3443 case VCHR: 3444 if (vp->v_rdev == NULL) { 3445 vrele(vp); 3446 continue; 3447 } 3448 xvn[n].xv_dev = dev2udev(vp->v_rdev); 3449 break; 3450 case VSOCK: 3451 xvn[n].xv_socket = vp->v_socket; 3452 break; 3453 case VFIFO: 3454 xvn[n].xv_fifo = vp->v_fifoinfo; 3455 break; 3456 case VNON: 3457 case VBAD: 3458 default: 3459 /* shouldn't happen? */ 3460 vrele(vp); 3461 continue; 3462 } 3463 vrele(vp); 3464 ++n; 3465 } 3466 MNT_IUNLOCK(mp); 3467 mtx_lock(&mountlist_mtx); 3468 vfs_unbusy(mp); 3469 if (n == len) 3470 break; 3471 } 3472 mtx_unlock(&mountlist_mtx); 3473 3474 error = SYSCTL_OUT(req, xvn, n * sizeof *xvn); 3475 free(xvn, M_TEMP); 3476 return (error); 3477 } 3478 3479 SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE | CTLFLAG_RD | 3480 CTLFLAG_MPSAFE, 0, 0, sysctl_vnode, "S,xvnode", 3481 ""); 3482 #endif 3483 3484 /* 3485 * Unmount all filesystems. The list is traversed in reverse order 3486 * of mounting to avoid dependencies. 3487 */ 3488 void 3489 vfs_unmountall(void) 3490 { 3491 struct mount *mp; 3492 struct thread *td; 3493 int error; 3494 3495 CTR1(KTR_VFS, "%s: unmounting all filesystems", __func__); 3496 td = curthread; 3497 3498 /* 3499 * Since this only runs when rebooting, it is not interlocked. 3500 */ 3501 while(!TAILQ_EMPTY(&mountlist)) { 3502 mp = TAILQ_LAST(&mountlist, mntlist); 3503 error = dounmount(mp, MNT_FORCE, td); 3504 if (error) { 3505 TAILQ_REMOVE(&mountlist, mp, mnt_list); 3506 /* 3507 * XXX: Due to the way in which we mount the root 3508 * file system off of devfs, devfs will generate a 3509 * "busy" warning when we try to unmount it before 3510 * the root. Don't print a warning as a result in 3511 * order to avoid false positive errors that may 3512 * cause needless upset. 3513 */ 3514 if (strcmp(mp->mnt_vfc->vfc_name, "devfs") != 0) { 3515 printf("unmount of %s failed (", 3516 mp->mnt_stat.f_mntonname); 3517 if (error == EBUSY) 3518 printf("BUSY)\n"); 3519 else 3520 printf("%d)\n", error); 3521 } 3522 } else { 3523 /* The unmount has removed mp from the mountlist */ 3524 } 3525 } 3526 } 3527 3528 /* 3529 * perform msync on all vnodes under a mount point 3530 * the mount point must be locked. 3531 */ 3532 void 3533 vfs_msync(struct mount *mp, int flags) 3534 { 3535 struct vnode *vp, *mvp; 3536 struct vm_object *obj; 3537 3538 CTR2(KTR_VFS, "%s: mp %p", __func__, mp); 3539 MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) { 3540 obj = vp->v_object; 3541 if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0 && 3542 (flags == MNT_WAIT || VOP_ISLOCKED(vp) == 0)) { 3543 if (!vget(vp, 3544 LK_EXCLUSIVE | LK_RETRY | LK_INTERLOCK, 3545 curthread)) { 3546 if (vp->v_vflag & VV_NOSYNC) { /* unlinked */ 3547 vput(vp); 3548 continue; 3549 } 3550 3551 obj = vp->v_object; 3552 if (obj != NULL) { 3553 VM_OBJECT_WLOCK(obj); 3554 vm_object_page_clean(obj, 0, 0, 3555 flags == MNT_WAIT ? 3556 OBJPC_SYNC : OBJPC_NOSYNC); 3557 VM_OBJECT_WUNLOCK(obj); 3558 } 3559 vput(vp); 3560 } 3561 } else 3562 VI_UNLOCK(vp); 3563 } 3564 } 3565 3566 static void 3567 destroy_vpollinfo_free(struct vpollinfo *vi) 3568 { 3569 3570 knlist_destroy(&vi->vpi_selinfo.si_note); 3571 mtx_destroy(&vi->vpi_lock); 3572 uma_zfree(vnodepoll_zone, vi); 3573 } 3574 3575 static void 3576 destroy_vpollinfo(struct vpollinfo *vi) 3577 { 3578 3579 knlist_clear(&vi->vpi_selinfo.si_note, 1); 3580 seldrain(&vi->vpi_selinfo); 3581 destroy_vpollinfo_free(vi); 3582 } 3583 3584 /* 3585 * Initalize per-vnode helper structure to hold poll-related state. 3586 */ 3587 void 3588 v_addpollinfo(struct vnode *vp) 3589 { 3590 struct vpollinfo *vi; 3591 3592 if (vp->v_pollinfo != NULL) 3593 return; 3594 vi = uma_zalloc(vnodepoll_zone, M_WAITOK); 3595 mtx_init(&vi->vpi_lock, "vnode pollinfo", NULL, MTX_DEF); 3596 knlist_init(&vi->vpi_selinfo.si_note, vp, vfs_knllock, 3597 vfs_knlunlock, vfs_knl_assert_locked, vfs_knl_assert_unlocked); 3598 VI_LOCK(vp); 3599 if (vp->v_pollinfo != NULL) { 3600 VI_UNLOCK(vp); 3601 destroy_vpollinfo_free(vi); 3602 return; 3603 } 3604 vp->v_pollinfo = vi; 3605 VI_UNLOCK(vp); 3606 } 3607 3608 /* 3609 * Record a process's interest in events which might happen to 3610 * a vnode. Because poll uses the historic select-style interface 3611 * internally, this routine serves as both the ``check for any 3612 * pending events'' and the ``record my interest in future events'' 3613 * functions. (These are done together, while the lock is held, 3614 * to avoid race conditions.) 3615 */ 3616 int 3617 vn_pollrecord(struct vnode *vp, struct thread *td, int events) 3618 { 3619 3620 v_addpollinfo(vp); 3621 mtx_lock(&vp->v_pollinfo->vpi_lock); 3622 if (vp->v_pollinfo->vpi_revents & events) { 3623 /* 3624 * This leaves events we are not interested 3625 * in available for the other process which 3626 * which presumably had requested them 3627 * (otherwise they would never have been 3628 * recorded). 3629 */ 3630 events &= vp->v_pollinfo->vpi_revents; 3631 vp->v_pollinfo->vpi_revents &= ~events; 3632 3633 mtx_unlock(&vp->v_pollinfo->vpi_lock); 3634 return (events); 3635 } 3636 vp->v_pollinfo->vpi_events |= events; 3637 selrecord(td, &vp->v_pollinfo->vpi_selinfo); 3638 mtx_unlock(&vp->v_pollinfo->vpi_lock); 3639 return (0); 3640 } 3641 3642 /* 3643 * Routine to create and manage a filesystem syncer vnode. 3644 */ 3645 #define sync_close ((int (*)(struct vop_close_args *))nullop) 3646 static int sync_fsync(struct vop_fsync_args *); 3647 static int sync_inactive(struct vop_inactive_args *); 3648 static int sync_reclaim(struct vop_reclaim_args *); 3649 3650 static struct vop_vector sync_vnodeops = { 3651 .vop_bypass = VOP_EOPNOTSUPP, 3652 .vop_close = sync_close, /* close */ 3653 .vop_fsync = sync_fsync, /* fsync */ 3654 .vop_inactive = sync_inactive, /* inactive */ 3655 .vop_reclaim = sync_reclaim, /* reclaim */ 3656 .vop_lock1 = vop_stdlock, /* lock */ 3657 .vop_unlock = vop_stdunlock, /* unlock */ 3658 .vop_islocked = vop_stdislocked, /* islocked */ 3659 }; 3660 3661 /* 3662 * Create a new filesystem syncer vnode for the specified mount point. 3663 */ 3664 void 3665 vfs_allocate_syncvnode(struct mount *mp) 3666 { 3667 struct vnode *vp; 3668 struct bufobj *bo; 3669 static long start, incr, next; 3670 int error; 3671 3672 /* Allocate a new vnode */ 3673 error = getnewvnode("syncer", mp, &sync_vnodeops, &vp); 3674 if (error != 0) 3675 panic("vfs_allocate_syncvnode: getnewvnode() failed"); 3676 vp->v_type = VNON; 3677 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3678 vp->v_vflag |= VV_FORCEINSMQ; 3679 error = insmntque(vp, mp); 3680 if (error != 0) 3681 panic("vfs_allocate_syncvnode: insmntque() failed"); 3682 vp->v_vflag &= ~VV_FORCEINSMQ; 3683 VOP_UNLOCK(vp, 0); 3684 /* 3685 * Place the vnode onto the syncer worklist. We attempt to 3686 * scatter them about on the list so that they will go off 3687 * at evenly distributed times even if all the filesystems 3688 * are mounted at once. 3689 */ 3690 next += incr; 3691 if (next == 0 || next > syncer_maxdelay) { 3692 start /= 2; 3693 incr /= 2; 3694 if (start == 0) { 3695 start = syncer_maxdelay / 2; 3696 incr = syncer_maxdelay; 3697 } 3698 next = start; 3699 } 3700 bo = &vp->v_bufobj; 3701 BO_LOCK(bo); 3702 vn_syncer_add_to_worklist(bo, syncdelay > 0 ? next % syncdelay : 0); 3703 /* XXX - vn_syncer_add_to_worklist() also grabs and drops sync_mtx. */ 3704 mtx_lock(&sync_mtx); 3705 sync_vnode_count++; 3706 if (mp->mnt_syncer == NULL) { 3707 mp->mnt_syncer = vp; 3708 vp = NULL; 3709 } 3710 mtx_unlock(&sync_mtx); 3711 BO_UNLOCK(bo); 3712 if (vp != NULL) { 3713 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 3714 vgone(vp); 3715 vput(vp); 3716 } 3717 } 3718 3719 void 3720 vfs_deallocate_syncvnode(struct mount *mp) 3721 { 3722 struct vnode *vp; 3723 3724 mtx_lock(&sync_mtx); 3725 vp = mp->mnt_syncer; 3726 if (vp != NULL) 3727 mp->mnt_syncer = NULL; 3728 mtx_unlock(&sync_mtx); 3729 if (vp != NULL) 3730 vrele(vp); 3731 } 3732 3733 /* 3734 * Do a lazy sync of the filesystem. 3735 */ 3736 static int 3737 sync_fsync(struct vop_fsync_args *ap) 3738 { 3739 struct vnode *syncvp = ap->a_vp; 3740 struct mount *mp = syncvp->v_mount; 3741 int error, save; 3742 struct bufobj *bo; 3743 3744 /* 3745 * We only need to do something if this is a lazy evaluation. 3746 */ 3747 if (ap->a_waitfor != MNT_LAZY) 3748 return (0); 3749 3750 /* 3751 * Move ourselves to the back of the sync list. 3752 */ 3753 bo = &syncvp->v_bufobj; 3754 BO_LOCK(bo); 3755 vn_syncer_add_to_worklist(bo, syncdelay); 3756 BO_UNLOCK(bo); 3757 3758 /* 3759 * Walk the list of vnodes pushing all that are dirty and 3760 * not already on the sync list. 3761 */ 3762 if (vfs_busy(mp, MBF_NOWAIT) != 0) 3763 return (0); 3764 if (vn_start_write(NULL, &mp, V_NOWAIT) != 0) { 3765 vfs_unbusy(mp); 3766 return (0); 3767 } 3768 save = curthread_pflags_set(TDP_SYNCIO); 3769 vfs_msync(mp, MNT_NOWAIT); 3770 error = VFS_SYNC(mp, MNT_LAZY); 3771 curthread_pflags_restore(save); 3772 vn_finished_write(mp); 3773 vfs_unbusy(mp); 3774 return (error); 3775 } 3776 3777 /* 3778 * The syncer vnode is no referenced. 3779 */ 3780 static int 3781 sync_inactive(struct vop_inactive_args *ap) 3782 { 3783 3784 vgone(ap->a_vp); 3785 return (0); 3786 } 3787 3788 /* 3789 * The syncer vnode is no longer needed and is being decommissioned. 3790 * 3791 * Modifications to the worklist must be protected by sync_mtx. 3792 */ 3793 static int 3794 sync_reclaim(struct vop_reclaim_args *ap) 3795 { 3796 struct vnode *vp = ap->a_vp; 3797 struct bufobj *bo; 3798 3799 bo = &vp->v_bufobj; 3800 BO_LOCK(bo); 3801 mtx_lock(&sync_mtx); 3802 if (vp->v_mount->mnt_syncer == vp) 3803 vp->v_mount->mnt_syncer = NULL; 3804 if (bo->bo_flag & BO_ONWORKLST) { 3805 LIST_REMOVE(bo, bo_synclist); 3806 syncer_worklist_len--; 3807 sync_vnode_count--; 3808 bo->bo_flag &= ~BO_ONWORKLST; 3809 } 3810 mtx_unlock(&sync_mtx); 3811 BO_UNLOCK(bo); 3812 3813 return (0); 3814 } 3815 3816 /* 3817 * Check if vnode represents a disk device 3818 */ 3819 int 3820 vn_isdisk(struct vnode *vp, int *errp) 3821 { 3822 int error; 3823 3824 if (vp->v_type != VCHR) { 3825 error = ENOTBLK; 3826 goto out; 3827 } 3828 error = 0; 3829 dev_lock(); 3830 if (vp->v_rdev == NULL) 3831 error = ENXIO; 3832 else if (vp->v_rdev->si_devsw == NULL) 3833 error = ENXIO; 3834 else if (!(vp->v_rdev->si_devsw->d_flags & D_DISK)) 3835 error = ENOTBLK; 3836 dev_unlock(); 3837 out: 3838 if (errp != NULL) 3839 *errp = error; 3840 return (error == 0); 3841 } 3842 3843 /* 3844 * Common filesystem object access control check routine. Accepts a 3845 * vnode's type, "mode", uid and gid, requested access mode, credentials, 3846 * and optional call-by-reference privused argument allowing vaccess() 3847 * to indicate to the caller whether privilege was used to satisfy the 3848 * request (obsoleted). Returns 0 on success, or an errno on failure. 3849 */ 3850 int 3851 vaccess(enum vtype type, mode_t file_mode, uid_t file_uid, gid_t file_gid, 3852 accmode_t accmode, struct ucred *cred, int *privused) 3853 { 3854 accmode_t dac_granted; 3855 accmode_t priv_granted; 3856 3857 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND)) == 0, 3858 ("invalid bit in accmode")); 3859 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 3860 ("VAPPEND without VWRITE")); 3861 3862 /* 3863 * Look for a normal, non-privileged way to access the file/directory 3864 * as requested. If it exists, go with that. 3865 */ 3866 3867 if (privused != NULL) 3868 *privused = 0; 3869 3870 dac_granted = 0; 3871 3872 /* Check the owner. */ 3873 if (cred->cr_uid == file_uid) { 3874 dac_granted |= VADMIN; 3875 if (file_mode & S_IXUSR) 3876 dac_granted |= VEXEC; 3877 if (file_mode & S_IRUSR) 3878 dac_granted |= VREAD; 3879 if (file_mode & S_IWUSR) 3880 dac_granted |= (VWRITE | VAPPEND); 3881 3882 if ((accmode & dac_granted) == accmode) 3883 return (0); 3884 3885 goto privcheck; 3886 } 3887 3888 /* Otherwise, check the groups (first match) */ 3889 if (groupmember(file_gid, cred)) { 3890 if (file_mode & S_IXGRP) 3891 dac_granted |= VEXEC; 3892 if (file_mode & S_IRGRP) 3893 dac_granted |= VREAD; 3894 if (file_mode & S_IWGRP) 3895 dac_granted |= (VWRITE | VAPPEND); 3896 3897 if ((accmode & dac_granted) == accmode) 3898 return (0); 3899 3900 goto privcheck; 3901 } 3902 3903 /* Otherwise, check everyone else. */ 3904 if (file_mode & S_IXOTH) 3905 dac_granted |= VEXEC; 3906 if (file_mode & S_IROTH) 3907 dac_granted |= VREAD; 3908 if (file_mode & S_IWOTH) 3909 dac_granted |= (VWRITE | VAPPEND); 3910 if ((accmode & dac_granted) == accmode) 3911 return (0); 3912 3913 privcheck: 3914 /* 3915 * Build a privilege mask to determine if the set of privileges 3916 * satisfies the requirements when combined with the granted mask 3917 * from above. For each privilege, if the privilege is required, 3918 * bitwise or the request type onto the priv_granted mask. 3919 */ 3920 priv_granted = 0; 3921 3922 if (type == VDIR) { 3923 /* 3924 * For directories, use PRIV_VFS_LOOKUP to satisfy VEXEC 3925 * requests, instead of PRIV_VFS_EXEC. 3926 */ 3927 if ((accmode & VEXEC) && ((dac_granted & VEXEC) == 0) && 3928 !priv_check_cred(cred, PRIV_VFS_LOOKUP, 0)) 3929 priv_granted |= VEXEC; 3930 } else { 3931 /* 3932 * Ensure that at least one execute bit is on. Otherwise, 3933 * a privileged user will always succeed, and we don't want 3934 * this to happen unless the file really is executable. 3935 */ 3936 if ((accmode & VEXEC) && ((dac_granted & VEXEC) == 0) && 3937 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 3938 !priv_check_cred(cred, PRIV_VFS_EXEC, 0)) 3939 priv_granted |= VEXEC; 3940 } 3941 3942 if ((accmode & VREAD) && ((dac_granted & VREAD) == 0) && 3943 !priv_check_cred(cred, PRIV_VFS_READ, 0)) 3944 priv_granted |= VREAD; 3945 3946 if ((accmode & VWRITE) && ((dac_granted & VWRITE) == 0) && 3947 !priv_check_cred(cred, PRIV_VFS_WRITE, 0)) 3948 priv_granted |= (VWRITE | VAPPEND); 3949 3950 if ((accmode & VADMIN) && ((dac_granted & VADMIN) == 0) && 3951 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0)) 3952 priv_granted |= VADMIN; 3953 3954 if ((accmode & (priv_granted | dac_granted)) == accmode) { 3955 /* XXX audit: privilege used */ 3956 if (privused != NULL) 3957 *privused = 1; 3958 return (0); 3959 } 3960 3961 return ((accmode & VADMIN) ? EPERM : EACCES); 3962 } 3963 3964 /* 3965 * Credential check based on process requesting service, and per-attribute 3966 * permissions. 3967 */ 3968 int 3969 extattr_check_cred(struct vnode *vp, int attrnamespace, struct ucred *cred, 3970 struct thread *td, accmode_t accmode) 3971 { 3972 3973 /* 3974 * Kernel-invoked always succeeds. 3975 */ 3976 if (cred == NOCRED) 3977 return (0); 3978 3979 /* 3980 * Do not allow privileged processes in jail to directly manipulate 3981 * system attributes. 3982 */ 3983 switch (attrnamespace) { 3984 case EXTATTR_NAMESPACE_SYSTEM: 3985 /* Potentially should be: return (EPERM); */ 3986 return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM, 0)); 3987 case EXTATTR_NAMESPACE_USER: 3988 return (VOP_ACCESS(vp, accmode, cred, td)); 3989 default: 3990 return (EPERM); 3991 } 3992 } 3993 3994 #ifdef DEBUG_VFS_LOCKS 3995 /* 3996 * This only exists to supress warnings from unlocked specfs accesses. It is 3997 * no longer ok to have an unlocked VFS. 3998 */ 3999 #define IGNORE_LOCK(vp) (panicstr != NULL || (vp) == NULL || \ 4000 (vp)->v_type == VCHR || (vp)->v_type == VBAD) 4001 4002 int vfs_badlock_ddb = 1; /* Drop into debugger on violation. */ 4003 SYSCTL_INT(_debug, OID_AUTO, vfs_badlock_ddb, CTLFLAG_RW, &vfs_badlock_ddb, 0, 4004 "Drop into debugger on lock violation"); 4005 4006 int vfs_badlock_mutex = 1; /* Check for interlock across VOPs. */ 4007 SYSCTL_INT(_debug, OID_AUTO, vfs_badlock_mutex, CTLFLAG_RW, &vfs_badlock_mutex, 4008 0, "Check for interlock across VOPs"); 4009 4010 int vfs_badlock_print = 1; /* Print lock violations. */ 4011 SYSCTL_INT(_debug, OID_AUTO, vfs_badlock_print, CTLFLAG_RW, &vfs_badlock_print, 4012 0, "Print lock violations"); 4013 4014 #ifdef KDB 4015 int vfs_badlock_backtrace = 1; /* Print backtrace at lock violations. */ 4016 SYSCTL_INT(_debug, OID_AUTO, vfs_badlock_backtrace, CTLFLAG_RW, 4017 &vfs_badlock_backtrace, 0, "Print backtrace at lock violations"); 4018 #endif 4019 4020 static void 4021 vfs_badlock(const char *msg, const char *str, struct vnode *vp) 4022 { 4023 4024 #ifdef KDB 4025 if (vfs_badlock_backtrace) 4026 kdb_backtrace(); 4027 #endif 4028 if (vfs_badlock_print) 4029 printf("%s: %p %s\n", str, (void *)vp, msg); 4030 if (vfs_badlock_ddb) 4031 kdb_enter(KDB_WHY_VFSLOCK, "lock violation"); 4032 } 4033 4034 void 4035 assert_vi_locked(struct vnode *vp, const char *str) 4036 { 4037 4038 if (vfs_badlock_mutex && !mtx_owned(VI_MTX(vp))) 4039 vfs_badlock("interlock is not locked but should be", str, vp); 4040 } 4041 4042 void 4043 assert_vi_unlocked(struct vnode *vp, const char *str) 4044 { 4045 4046 if (vfs_badlock_mutex && mtx_owned(VI_MTX(vp))) 4047 vfs_badlock("interlock is locked but should not be", str, vp); 4048 } 4049 4050 void 4051 assert_vop_locked(struct vnode *vp, const char *str) 4052 { 4053 int locked; 4054 4055 if (!IGNORE_LOCK(vp)) { 4056 locked = VOP_ISLOCKED(vp); 4057 if (locked == 0 || locked == LK_EXCLOTHER) 4058 vfs_badlock("is not locked but should be", str, vp); 4059 } 4060 } 4061 4062 void 4063 assert_vop_unlocked(struct vnode *vp, const char *str) 4064 { 4065 4066 if (!IGNORE_LOCK(vp) && VOP_ISLOCKED(vp) == LK_EXCLUSIVE) 4067 vfs_badlock("is locked but should not be", str, vp); 4068 } 4069 4070 void 4071 assert_vop_elocked(struct vnode *vp, const char *str) 4072 { 4073 4074 if (!IGNORE_LOCK(vp) && VOP_ISLOCKED(vp) != LK_EXCLUSIVE) 4075 vfs_badlock("is not exclusive locked but should be", str, vp); 4076 } 4077 4078 #if 0 4079 void 4080 assert_vop_elocked_other(struct vnode *vp, const char *str) 4081 { 4082 4083 if (!IGNORE_LOCK(vp) && VOP_ISLOCKED(vp) != LK_EXCLOTHER) 4084 vfs_badlock("is not exclusive locked by another thread", 4085 str, vp); 4086 } 4087 4088 void 4089 assert_vop_slocked(struct vnode *vp, const char *str) 4090 { 4091 4092 if (!IGNORE_LOCK(vp) && VOP_ISLOCKED(vp) != LK_SHARED) 4093 vfs_badlock("is not locked shared but should be", str, vp); 4094 } 4095 #endif /* 0 */ 4096 #endif /* DEBUG_VFS_LOCKS */ 4097 4098 void 4099 vop_rename_fail(struct vop_rename_args *ap) 4100 { 4101 4102 if (ap->a_tvp != NULL) 4103 vput(ap->a_tvp); 4104 if (ap->a_tdvp == ap->a_tvp) 4105 vrele(ap->a_tdvp); 4106 else 4107 vput(ap->a_tdvp); 4108 vrele(ap->a_fdvp); 4109 vrele(ap->a_fvp); 4110 } 4111 4112 void 4113 vop_rename_pre(void *ap) 4114 { 4115 struct vop_rename_args *a = ap; 4116 4117 #ifdef DEBUG_VFS_LOCKS 4118 if (a->a_tvp) 4119 ASSERT_VI_UNLOCKED(a->a_tvp, "VOP_RENAME"); 4120 ASSERT_VI_UNLOCKED(a->a_tdvp, "VOP_RENAME"); 4121 ASSERT_VI_UNLOCKED(a->a_fvp, "VOP_RENAME"); 4122 ASSERT_VI_UNLOCKED(a->a_fdvp, "VOP_RENAME"); 4123 4124 /* Check the source (from). */ 4125 if (a->a_tdvp->v_vnlock != a->a_fdvp->v_vnlock && 4126 (a->a_tvp == NULL || a->a_tvp->v_vnlock != a->a_fdvp->v_vnlock)) 4127 ASSERT_VOP_UNLOCKED(a->a_fdvp, "vop_rename: fdvp locked"); 4128 if (a->a_tvp == NULL || a->a_tvp->v_vnlock != a->a_fvp->v_vnlock) 4129 ASSERT_VOP_UNLOCKED(a->a_fvp, "vop_rename: fvp locked"); 4130 4131 /* Check the target. */ 4132 if (a->a_tvp) 4133 ASSERT_VOP_LOCKED(a->a_tvp, "vop_rename: tvp not locked"); 4134 ASSERT_VOP_LOCKED(a->a_tdvp, "vop_rename: tdvp not locked"); 4135 #endif 4136 if (a->a_tdvp != a->a_fdvp) 4137 vhold(a->a_fdvp); 4138 if (a->a_tvp != a->a_fvp) 4139 vhold(a->a_fvp); 4140 vhold(a->a_tdvp); 4141 if (a->a_tvp) 4142 vhold(a->a_tvp); 4143 } 4144 4145 void 4146 vop_strategy_pre(void *ap) 4147 { 4148 #ifdef DEBUG_VFS_LOCKS 4149 struct vop_strategy_args *a; 4150 struct buf *bp; 4151 4152 a = ap; 4153 bp = a->a_bp; 4154 4155 /* 4156 * Cluster ops lock their component buffers but not the IO container. 4157 */ 4158 if ((bp->b_flags & B_CLUSTER) != 0) 4159 return; 4160 4161 if (panicstr == NULL && !BUF_ISLOCKED(bp)) { 4162 if (vfs_badlock_print) 4163 printf( 4164 "VOP_STRATEGY: bp is not locked but should be\n"); 4165 if (vfs_badlock_ddb) 4166 kdb_enter(KDB_WHY_VFSLOCK, "lock violation"); 4167 } 4168 #endif 4169 } 4170 4171 void 4172 vop_lock_pre(void *ap) 4173 { 4174 #ifdef DEBUG_VFS_LOCKS 4175 struct vop_lock1_args *a = ap; 4176 4177 if ((a->a_flags & LK_INTERLOCK) == 0) 4178 ASSERT_VI_UNLOCKED(a->a_vp, "VOP_LOCK"); 4179 else 4180 ASSERT_VI_LOCKED(a->a_vp, "VOP_LOCK"); 4181 #endif 4182 } 4183 4184 void 4185 vop_lock_post(void *ap, int rc) 4186 { 4187 #ifdef DEBUG_VFS_LOCKS 4188 struct vop_lock1_args *a = ap; 4189 4190 ASSERT_VI_UNLOCKED(a->a_vp, "VOP_LOCK"); 4191 if (rc == 0 && (a->a_flags & LK_EXCLOTHER) == 0) 4192 ASSERT_VOP_LOCKED(a->a_vp, "VOP_LOCK"); 4193 #endif 4194 } 4195 4196 void 4197 vop_unlock_pre(void *ap) 4198 { 4199 #ifdef DEBUG_VFS_LOCKS 4200 struct vop_unlock_args *a = ap; 4201 4202 if (a->a_flags & LK_INTERLOCK) 4203 ASSERT_VI_LOCKED(a->a_vp, "VOP_UNLOCK"); 4204 ASSERT_VOP_LOCKED(a->a_vp, "VOP_UNLOCK"); 4205 #endif 4206 } 4207 4208 void 4209 vop_unlock_post(void *ap, int rc) 4210 { 4211 #ifdef DEBUG_VFS_LOCKS 4212 struct vop_unlock_args *a = ap; 4213 4214 if (a->a_flags & LK_INTERLOCK) 4215 ASSERT_VI_UNLOCKED(a->a_vp, "VOP_UNLOCK"); 4216 #endif 4217 } 4218 4219 void 4220 vop_create_post(void *ap, int rc) 4221 { 4222 struct vop_create_args *a = ap; 4223 4224 if (!rc) 4225 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE); 4226 } 4227 4228 void 4229 vop_deleteextattr_post(void *ap, int rc) 4230 { 4231 struct vop_deleteextattr_args *a = ap; 4232 4233 if (!rc) 4234 VFS_KNOTE_LOCKED(a->a_vp, NOTE_ATTRIB); 4235 } 4236 4237 void 4238 vop_link_post(void *ap, int rc) 4239 { 4240 struct vop_link_args *a = ap; 4241 4242 if (!rc) { 4243 VFS_KNOTE_LOCKED(a->a_vp, NOTE_LINK); 4244 VFS_KNOTE_LOCKED(a->a_tdvp, NOTE_WRITE); 4245 } 4246 } 4247 4248 void 4249 vop_mkdir_post(void *ap, int rc) 4250 { 4251 struct vop_mkdir_args *a = ap; 4252 4253 if (!rc) 4254 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE | NOTE_LINK); 4255 } 4256 4257 void 4258 vop_mknod_post(void *ap, int rc) 4259 { 4260 struct vop_mknod_args *a = ap; 4261 4262 if (!rc) 4263 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE); 4264 } 4265 4266 void 4267 vop_remove_post(void *ap, int rc) 4268 { 4269 struct vop_remove_args *a = ap; 4270 4271 if (!rc) { 4272 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE); 4273 VFS_KNOTE_LOCKED(a->a_vp, NOTE_DELETE); 4274 } 4275 } 4276 4277 void 4278 vop_rename_post(void *ap, int rc) 4279 { 4280 struct vop_rename_args *a = ap; 4281 4282 if (!rc) { 4283 VFS_KNOTE_UNLOCKED(a->a_fdvp, NOTE_WRITE); 4284 VFS_KNOTE_UNLOCKED(a->a_tdvp, NOTE_WRITE); 4285 VFS_KNOTE_UNLOCKED(a->a_fvp, NOTE_RENAME); 4286 if (a->a_tvp) 4287 VFS_KNOTE_UNLOCKED(a->a_tvp, NOTE_DELETE); 4288 } 4289 if (a->a_tdvp != a->a_fdvp) 4290 vdrop(a->a_fdvp); 4291 if (a->a_tvp != a->a_fvp) 4292 vdrop(a->a_fvp); 4293 vdrop(a->a_tdvp); 4294 if (a->a_tvp) 4295 vdrop(a->a_tvp); 4296 } 4297 4298 void 4299 vop_rmdir_post(void *ap, int rc) 4300 { 4301 struct vop_rmdir_args *a = ap; 4302 4303 if (!rc) { 4304 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE | NOTE_LINK); 4305 VFS_KNOTE_LOCKED(a->a_vp, NOTE_DELETE); 4306 } 4307 } 4308 4309 void 4310 vop_setattr_post(void *ap, int rc) 4311 { 4312 struct vop_setattr_args *a = ap; 4313 4314 if (!rc) 4315 VFS_KNOTE_LOCKED(a->a_vp, NOTE_ATTRIB); 4316 } 4317 4318 void 4319 vop_setextattr_post(void *ap, int rc) 4320 { 4321 struct vop_setextattr_args *a = ap; 4322 4323 if (!rc) 4324 VFS_KNOTE_LOCKED(a->a_vp, NOTE_ATTRIB); 4325 } 4326 4327 void 4328 vop_symlink_post(void *ap, int rc) 4329 { 4330 struct vop_symlink_args *a = ap; 4331 4332 if (!rc) 4333 VFS_KNOTE_LOCKED(a->a_dvp, NOTE_WRITE); 4334 } 4335 4336 static struct knlist fs_knlist; 4337 4338 static void 4339 vfs_event_init(void *arg) 4340 { 4341 knlist_init_mtx(&fs_knlist, NULL); 4342 } 4343 /* XXX - correct order? */ 4344 SYSINIT(vfs_knlist, SI_SUB_VFS, SI_ORDER_ANY, vfs_event_init, NULL); 4345 4346 void 4347 vfs_event_signal(fsid_t *fsid, uint32_t event, intptr_t data __unused) 4348 { 4349 4350 KNOTE_UNLOCKED(&fs_knlist, event); 4351 } 4352 4353 static int filt_fsattach(struct knote *kn); 4354 static void filt_fsdetach(struct knote *kn); 4355 static int filt_fsevent(struct knote *kn, long hint); 4356 4357 struct filterops fs_filtops = { 4358 .f_isfd = 0, 4359 .f_attach = filt_fsattach, 4360 .f_detach = filt_fsdetach, 4361 .f_event = filt_fsevent 4362 }; 4363 4364 static int 4365 filt_fsattach(struct knote *kn) 4366 { 4367 4368 kn->kn_flags |= EV_CLEAR; 4369 knlist_add(&fs_knlist, kn, 0); 4370 return (0); 4371 } 4372 4373 static void 4374 filt_fsdetach(struct knote *kn) 4375 { 4376 4377 knlist_remove(&fs_knlist, kn, 0); 4378 } 4379 4380 static int 4381 filt_fsevent(struct knote *kn, long hint) 4382 { 4383 4384 kn->kn_fflags |= hint; 4385 return (kn->kn_fflags != 0); 4386 } 4387 4388 static int 4389 sysctl_vfs_ctl(SYSCTL_HANDLER_ARGS) 4390 { 4391 struct vfsidctl vc; 4392 int error; 4393 struct mount *mp; 4394 4395 error = SYSCTL_IN(req, &vc, sizeof(vc)); 4396 if (error) 4397 return (error); 4398 if (vc.vc_vers != VFS_CTL_VERS1) 4399 return (EINVAL); 4400 mp = vfs_getvfs(&vc.vc_fsid); 4401 if (mp == NULL) 4402 return (ENOENT); 4403 /* ensure that a specific sysctl goes to the right filesystem. */ 4404 if (strcmp(vc.vc_fstypename, "*") != 0 && 4405 strcmp(vc.vc_fstypename, mp->mnt_vfc->vfc_name) != 0) { 4406 vfs_rel(mp); 4407 return (EINVAL); 4408 } 4409 VCTLTOREQ(&vc, req); 4410 error = VFS_SYSCTL(mp, vc.vc_op, req); 4411 vfs_rel(mp); 4412 return (error); 4413 } 4414 4415 SYSCTL_PROC(_vfs, OID_AUTO, ctl, CTLTYPE_OPAQUE | CTLFLAG_WR, 4416 NULL, 0, sysctl_vfs_ctl, "", 4417 "Sysctl by fsid"); 4418 4419 /* 4420 * Function to initialize a va_filerev field sensibly. 4421 * XXX: Wouldn't a random number make a lot more sense ?? 4422 */ 4423 u_quad_t 4424 init_va_filerev(void) 4425 { 4426 struct bintime bt; 4427 4428 getbinuptime(&bt); 4429 return (((u_quad_t)bt.sec << 32LL) | (bt.frac >> 32LL)); 4430 } 4431 4432 static int filt_vfsread(struct knote *kn, long hint); 4433 static int filt_vfswrite(struct knote *kn, long hint); 4434 static int filt_vfsvnode(struct knote *kn, long hint); 4435 static void filt_vfsdetach(struct knote *kn); 4436 static struct filterops vfsread_filtops = { 4437 .f_isfd = 1, 4438 .f_detach = filt_vfsdetach, 4439 .f_event = filt_vfsread 4440 }; 4441 static struct filterops vfswrite_filtops = { 4442 .f_isfd = 1, 4443 .f_detach = filt_vfsdetach, 4444 .f_event = filt_vfswrite 4445 }; 4446 static struct filterops vfsvnode_filtops = { 4447 .f_isfd = 1, 4448 .f_detach = filt_vfsdetach, 4449 .f_event = filt_vfsvnode 4450 }; 4451 4452 static void 4453 vfs_knllock(void *arg) 4454 { 4455 struct vnode *vp = arg; 4456 4457 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 4458 } 4459 4460 static void 4461 vfs_knlunlock(void *arg) 4462 { 4463 struct vnode *vp = arg; 4464 4465 VOP_UNLOCK(vp, 0); 4466 } 4467 4468 static void 4469 vfs_knl_assert_locked(void *arg) 4470 { 4471 #ifdef DEBUG_VFS_LOCKS 4472 struct vnode *vp = arg; 4473 4474 ASSERT_VOP_LOCKED(vp, "vfs_knl_assert_locked"); 4475 #endif 4476 } 4477 4478 static void 4479 vfs_knl_assert_unlocked(void *arg) 4480 { 4481 #ifdef DEBUG_VFS_LOCKS 4482 struct vnode *vp = arg; 4483 4484 ASSERT_VOP_UNLOCKED(vp, "vfs_knl_assert_unlocked"); 4485 #endif 4486 } 4487 4488 int 4489 vfs_kqfilter(struct vop_kqfilter_args *ap) 4490 { 4491 struct vnode *vp = ap->a_vp; 4492 struct knote *kn = ap->a_kn; 4493 struct knlist *knl; 4494 4495 switch (kn->kn_filter) { 4496 case EVFILT_READ: 4497 kn->kn_fop = &vfsread_filtops; 4498 break; 4499 case EVFILT_WRITE: 4500 kn->kn_fop = &vfswrite_filtops; 4501 break; 4502 case EVFILT_VNODE: 4503 kn->kn_fop = &vfsvnode_filtops; 4504 break; 4505 default: 4506 return (EINVAL); 4507 } 4508 4509 kn->kn_hook = (caddr_t)vp; 4510 4511 v_addpollinfo(vp); 4512 if (vp->v_pollinfo == NULL) 4513 return (ENOMEM); 4514 knl = &vp->v_pollinfo->vpi_selinfo.si_note; 4515 vhold(vp); 4516 knlist_add(knl, kn, 0); 4517 4518 return (0); 4519 } 4520 4521 /* 4522 * Detach knote from vnode 4523 */ 4524 static void 4525 filt_vfsdetach(struct knote *kn) 4526 { 4527 struct vnode *vp = (struct vnode *)kn->kn_hook; 4528 4529 KASSERT(vp->v_pollinfo != NULL, ("Missing v_pollinfo")); 4530 knlist_remove(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0); 4531 vdrop(vp); 4532 } 4533 4534 /*ARGSUSED*/ 4535 static int 4536 filt_vfsread(struct knote *kn, long hint) 4537 { 4538 struct vnode *vp = (struct vnode *)kn->kn_hook; 4539 struct vattr va; 4540 int res; 4541 4542 /* 4543 * filesystem is gone, so set the EOF flag and schedule 4544 * the knote for deletion. 4545 */ 4546 if (hint == NOTE_REVOKE) { 4547 VI_LOCK(vp); 4548 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 4549 VI_UNLOCK(vp); 4550 return (1); 4551 } 4552 4553 if (VOP_GETATTR(vp, &va, curthread->td_ucred)) 4554 return (0); 4555 4556 VI_LOCK(vp); 4557 kn->kn_data = va.va_size - kn->kn_fp->f_offset; 4558 res = (kn->kn_data != 0); 4559 VI_UNLOCK(vp); 4560 return (res); 4561 } 4562 4563 /*ARGSUSED*/ 4564 static int 4565 filt_vfswrite(struct knote *kn, long hint) 4566 { 4567 struct vnode *vp = (struct vnode *)kn->kn_hook; 4568 4569 VI_LOCK(vp); 4570 4571 /* 4572 * filesystem is gone, so set the EOF flag and schedule 4573 * the knote for deletion. 4574 */ 4575 if (hint == NOTE_REVOKE) 4576 kn->kn_flags |= (EV_EOF | EV_ONESHOT); 4577 4578 kn->kn_data = 0; 4579 VI_UNLOCK(vp); 4580 return (1); 4581 } 4582 4583 static int 4584 filt_vfsvnode(struct knote *kn, long hint) 4585 { 4586 struct vnode *vp = (struct vnode *)kn->kn_hook; 4587 int res; 4588 4589 VI_LOCK(vp); 4590 if (kn->kn_sfflags & hint) 4591 kn->kn_fflags |= hint; 4592 if (hint == NOTE_REVOKE) { 4593 kn->kn_flags |= EV_EOF; 4594 VI_UNLOCK(vp); 4595 return (1); 4596 } 4597 res = (kn->kn_fflags != 0); 4598 VI_UNLOCK(vp); 4599 return (res); 4600 } 4601 4602 int 4603 vfs_read_dirent(struct vop_readdir_args *ap, struct dirent *dp, off_t off) 4604 { 4605 int error; 4606 4607 if (dp->d_reclen > ap->a_uio->uio_resid) 4608 return (ENAMETOOLONG); 4609 error = uiomove(dp, dp->d_reclen, ap->a_uio); 4610 if (error) { 4611 if (ap->a_ncookies != NULL) { 4612 if (ap->a_cookies != NULL) 4613 free(ap->a_cookies, M_TEMP); 4614 ap->a_cookies = NULL; 4615 *ap->a_ncookies = 0; 4616 } 4617 return (error); 4618 } 4619 if (ap->a_ncookies == NULL) 4620 return (0); 4621 4622 KASSERT(ap->a_cookies, 4623 ("NULL ap->a_cookies value with non-NULL ap->a_ncookies!")); 4624 4625 *ap->a_cookies = realloc(*ap->a_cookies, 4626 (*ap->a_ncookies + 1) * sizeof(u_long), M_TEMP, M_WAITOK | M_ZERO); 4627 (*ap->a_cookies)[*ap->a_ncookies] = off; 4628 return (0); 4629 } 4630 4631 /* 4632 * Mark for update the access time of the file if the filesystem 4633 * supports VOP_MARKATIME. This functionality is used by execve and 4634 * mmap, so we want to avoid the I/O implied by directly setting 4635 * va_atime for the sake of efficiency. 4636 */ 4637 void 4638 vfs_mark_atime(struct vnode *vp, struct ucred *cred) 4639 { 4640 struct mount *mp; 4641 4642 mp = vp->v_mount; 4643 ASSERT_VOP_LOCKED(vp, "vfs_mark_atime"); 4644 if (mp != NULL && (mp->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) 4645 (void)VOP_MARKATIME(vp); 4646 } 4647 4648 /* 4649 * The purpose of this routine is to remove granularity from accmode_t, 4650 * reducing it into standard unix access bits - VEXEC, VREAD, VWRITE, 4651 * VADMIN and VAPPEND. 4652 * 4653 * If it returns 0, the caller is supposed to continue with the usual 4654 * access checks using 'accmode' as modified by this routine. If it 4655 * returns nonzero value, the caller is supposed to return that value 4656 * as errno. 4657 * 4658 * Note that after this routine runs, accmode may be zero. 4659 */ 4660 int 4661 vfs_unixify_accmode(accmode_t *accmode) 4662 { 4663 /* 4664 * There is no way to specify explicit "deny" rule using 4665 * file mode or POSIX.1e ACLs. 4666 */ 4667 if (*accmode & VEXPLICIT_DENY) { 4668 *accmode = 0; 4669 return (0); 4670 } 4671 4672 /* 4673 * None of these can be translated into usual access bits. 4674 * Also, the common case for NFSv4 ACLs is to not contain 4675 * either of these bits. Caller should check for VWRITE 4676 * on the containing directory instead. 4677 */ 4678 if (*accmode & (VDELETE_CHILD | VDELETE)) 4679 return (EPERM); 4680 4681 if (*accmode & VADMIN_PERMS) { 4682 *accmode &= ~VADMIN_PERMS; 4683 *accmode |= VADMIN; 4684 } 4685 4686 /* 4687 * There is no way to deny VREAD_ATTRIBUTES, VREAD_ACL 4688 * or VSYNCHRONIZE using file mode or POSIX.1e ACL. 4689 */ 4690 *accmode &= ~(VSTAT_PERMS | VSYNCHRONIZE); 4691 4692 return (0); 4693 } 4694 4695 /* 4696 * These are helper functions for filesystems to traverse all 4697 * their vnodes. See MNT_VNODE_FOREACH_ALL() in sys/mount.h. 4698 * 4699 * This interface replaces MNT_VNODE_FOREACH. 4700 */ 4701 4702 MALLOC_DEFINE(M_VNODE_MARKER, "vnodemarker", "vnode marker"); 4703 4704 struct vnode * 4705 __mnt_vnode_next_all(struct vnode **mvp, struct mount *mp) 4706 { 4707 struct vnode *vp; 4708 4709 if (should_yield()) 4710 kern_yield(PRI_USER); 4711 MNT_ILOCK(mp); 4712 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 4713 vp = TAILQ_NEXT(*mvp, v_nmntvnodes); 4714 while (vp != NULL && (vp->v_type == VMARKER || 4715 (vp->v_iflag & VI_DOOMED) != 0)) 4716 vp = TAILQ_NEXT(vp, v_nmntvnodes); 4717 4718 /* Check if we are done */ 4719 if (vp == NULL) { 4720 __mnt_vnode_markerfree_all(mvp, mp); 4721 /* MNT_IUNLOCK(mp); -- done in above function */ 4722 mtx_assert(MNT_MTX(mp), MA_NOTOWNED); 4723 return (NULL); 4724 } 4725 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 4726 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 4727 VI_LOCK(vp); 4728 MNT_IUNLOCK(mp); 4729 return (vp); 4730 } 4731 4732 struct vnode * 4733 __mnt_vnode_first_all(struct vnode **mvp, struct mount *mp) 4734 { 4735 struct vnode *vp; 4736 4737 *mvp = malloc(sizeof(struct vnode), M_VNODE_MARKER, M_WAITOK | M_ZERO); 4738 MNT_ILOCK(mp); 4739 MNT_REF(mp); 4740 (*mvp)->v_type = VMARKER; 4741 4742 vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 4743 while (vp != NULL && (vp->v_type == VMARKER || 4744 (vp->v_iflag & VI_DOOMED) != 0)) 4745 vp = TAILQ_NEXT(vp, v_nmntvnodes); 4746 4747 /* Check if we are done */ 4748 if (vp == NULL) { 4749 MNT_REL(mp); 4750 MNT_IUNLOCK(mp); 4751 free(*mvp, M_VNODE_MARKER); 4752 *mvp = NULL; 4753 return (NULL); 4754 } 4755 (*mvp)->v_mount = mp; 4756 TAILQ_INSERT_AFTER(&mp->mnt_nvnodelist, vp, *mvp, v_nmntvnodes); 4757 VI_LOCK(vp); 4758 MNT_IUNLOCK(mp); 4759 return (vp); 4760 } 4761 4762 4763 void 4764 __mnt_vnode_markerfree_all(struct vnode **mvp, struct mount *mp) 4765 { 4766 4767 if (*mvp == NULL) { 4768 MNT_IUNLOCK(mp); 4769 return; 4770 } 4771 4772 mtx_assert(MNT_MTX(mp), MA_OWNED); 4773 4774 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 4775 TAILQ_REMOVE(&mp->mnt_nvnodelist, *mvp, v_nmntvnodes); 4776 MNT_REL(mp); 4777 MNT_IUNLOCK(mp); 4778 free(*mvp, M_VNODE_MARKER); 4779 *mvp = NULL; 4780 } 4781 4782 /* 4783 * These are helper functions for filesystems to traverse their 4784 * active vnodes. See MNT_VNODE_FOREACH_ACTIVE() in sys/mount.h 4785 */ 4786 static void 4787 mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *mp) 4788 { 4789 4790 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 4791 4792 MNT_ILOCK(mp); 4793 MNT_REL(mp); 4794 MNT_IUNLOCK(mp); 4795 free(*mvp, M_VNODE_MARKER); 4796 *mvp = NULL; 4797 } 4798 4799 static struct vnode * 4800 mnt_vnode_next_active(struct vnode **mvp, struct mount *mp) 4801 { 4802 struct vnode *vp, *nvp; 4803 4804 mtx_assert(&vnode_free_list_mtx, MA_OWNED); 4805 KASSERT((*mvp)->v_mount == mp, ("marker vnode mount list mismatch")); 4806 restart: 4807 vp = TAILQ_NEXT(*mvp, v_actfreelist); 4808 TAILQ_REMOVE(&mp->mnt_activevnodelist, *mvp, v_actfreelist); 4809 while (vp != NULL) { 4810 if (vp->v_type == VMARKER) { 4811 vp = TAILQ_NEXT(vp, v_actfreelist); 4812 continue; 4813 } 4814 if (!VI_TRYLOCK(vp)) { 4815 if (mp_ncpus == 1 || should_yield()) { 4816 TAILQ_INSERT_BEFORE(vp, *mvp, v_actfreelist); 4817 mtx_unlock(&vnode_free_list_mtx); 4818 pause("vnacti", 1); 4819 mtx_lock(&vnode_free_list_mtx); 4820 goto restart; 4821 } 4822 continue; 4823 } 4824 KASSERT(vp->v_type != VMARKER, ("locked marker %p", vp)); 4825 KASSERT(vp->v_mount == mp || vp->v_mount == NULL, 4826 ("alien vnode on the active list %p %p", vp, mp)); 4827 if (vp->v_mount == mp && (vp->v_iflag & VI_DOOMED) == 0) 4828 break; 4829 nvp = TAILQ_NEXT(vp, v_actfreelist); 4830 VI_UNLOCK(vp); 4831 vp = nvp; 4832 } 4833 4834 /* Check if we are done */ 4835 if (vp == NULL) { 4836 mtx_unlock(&vnode_free_list_mtx); 4837 mnt_vnode_markerfree_active(mvp, mp); 4838 return (NULL); 4839 } 4840 TAILQ_INSERT_AFTER(&mp->mnt_activevnodelist, vp, *mvp, v_actfreelist); 4841 mtx_unlock(&vnode_free_list_mtx); 4842 ASSERT_VI_LOCKED(vp, "active iter"); 4843 KASSERT((vp->v_iflag & VI_ACTIVE) != 0, ("Non-active vp %p", vp)); 4844 return (vp); 4845 } 4846 4847 struct vnode * 4848 __mnt_vnode_next_active(struct vnode **mvp, struct mount *mp) 4849 { 4850 4851 if (should_yield()) 4852 kern_yield(PRI_USER); 4853 mtx_lock(&vnode_free_list_mtx); 4854 return (mnt_vnode_next_active(mvp, mp)); 4855 } 4856 4857 struct vnode * 4858 __mnt_vnode_first_active(struct vnode **mvp, struct mount *mp) 4859 { 4860 struct vnode *vp; 4861 4862 *mvp = malloc(sizeof(struct vnode), M_VNODE_MARKER, M_WAITOK | M_ZERO); 4863 MNT_ILOCK(mp); 4864 MNT_REF(mp); 4865 MNT_IUNLOCK(mp); 4866 (*mvp)->v_type = VMARKER; 4867 (*mvp)->v_mount = mp; 4868 4869 mtx_lock(&vnode_free_list_mtx); 4870 vp = TAILQ_FIRST(&mp->mnt_activevnodelist); 4871 if (vp == NULL) { 4872 mtx_unlock(&vnode_free_list_mtx); 4873 mnt_vnode_markerfree_active(mvp, mp); 4874 return (NULL); 4875 } 4876 TAILQ_INSERT_BEFORE(vp, *mvp, v_actfreelist); 4877 return (mnt_vnode_next_active(mvp, mp)); 4878 } 4879 4880 void 4881 __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *mp) 4882 { 4883 4884 if (*mvp == NULL) 4885 return; 4886 4887 mtx_lock(&vnode_free_list_mtx); 4888 TAILQ_REMOVE(&mp->mnt_activevnodelist, *mvp, v_actfreelist); 4889 mtx_unlock(&vnode_free_list_mtx); 4890 mnt_vnode_markerfree_active(mvp, mp); 4891 } 4892