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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95 39 * $FreeBSD: src/sys/kern/vfs_subr.c,v 1.249.2.30 2003/04/04 20:35:57 tegge Exp $ 40 * $DragonFly: src/sys/kern/vfs_subr.c,v 1.24 2004/01/27 23:56:48 dillon Exp $ 41 */ 42 43 /* 44 * External virtual filesystem routines 45 */ 46 #include "opt_ddb.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/buf.h> 51 #include <sys/conf.h> 52 #include <sys/dirent.h> 53 #include <sys/domain.h> 54 #include <sys/eventhandler.h> 55 #include <sys/fcntl.h> 56 #include <sys/kernel.h> 57 #include <sys/kthread.h> 58 #include <sys/malloc.h> 59 #include <sys/mbuf.h> 60 #include <sys/mount.h> 61 #include <sys/proc.h> 62 #include <sys/namei.h> 63 #include <sys/reboot.h> 64 #include <sys/socket.h> 65 #include <sys/stat.h> 66 #include <sys/sysctl.h> 67 #include <sys/syslog.h> 68 #include <sys/vmmeter.h> 69 #include <sys/vnode.h> 70 71 #include <machine/limits.h> 72 73 #include <vm/vm.h> 74 #include <vm/vm_object.h> 75 #include <vm/vm_extern.h> 76 #include <vm/vm_kern.h> 77 #include <vm/pmap.h> 78 #include <vm/vm_map.h> 79 #include <vm/vm_page.h> 80 #include <vm/vm_pager.h> 81 #include <vm/vnode_pager.h> 82 #include <vm/vm_zone.h> 83 84 #include <sys/buf2.h> 85 #include <sys/thread2.h> 86 87 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); 88 89 static void insmntque (struct vnode *vp, struct mount *mp); 90 static void vclean (struct vnode *vp, int flags, struct thread *td); 91 static unsigned long numvnodes; 92 static void vlruvp(struct vnode *vp); 93 SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, ""); 94 95 enum vtype iftovt_tab[16] = { 96 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, 97 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, 98 }; 99 int vttoif_tab[9] = { 100 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 101 S_IFSOCK, S_IFIFO, S_IFMT, 102 }; 103 104 static TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ 105 106 static u_long wantfreevnodes = 25; 107 SYSCTL_INT(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, ""); 108 static u_long freevnodes = 0; 109 SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, ""); 110 111 static int reassignbufcalls; 112 SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, &reassignbufcalls, 0, ""); 113 static int reassignbufloops; 114 SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW, &reassignbufloops, 0, ""); 115 static int reassignbufsortgood; 116 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW, &reassignbufsortgood, 0, ""); 117 static int reassignbufsortbad; 118 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW, &reassignbufsortbad, 0, ""); 119 static int reassignbufmethod = 1; 120 SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW, &reassignbufmethod, 0, ""); 121 122 #ifdef ENABLE_VFS_IOOPT 123 int vfs_ioopt = 0; 124 SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, ""); 125 #endif 126 127 struct mntlist mountlist = TAILQ_HEAD_INITIALIZER(mountlist); /* mounted fs */ 128 struct lwkt_token mountlist_token; 129 struct lwkt_token mntvnode_token; 130 int nfs_mount_type = -1; 131 static struct lwkt_token mntid_token; 132 static struct lwkt_token vnode_free_list_token; 133 static struct lwkt_token spechash_token; 134 struct nfs_public nfs_pub; /* publicly exported FS */ 135 static vm_zone_t vnode_zone; 136 137 /* 138 * The workitem queue. 139 */ 140 #define SYNCER_MAXDELAY 32 141 static int syncer_maxdelay = SYNCER_MAXDELAY; /* maximum delay time */ 142 time_t syncdelay = 30; /* max time to delay syncing data */ 143 SYSCTL_INT(_kern, OID_AUTO, syncdelay, CTLFLAG_RW, &syncdelay, 0, 144 "VFS data synchronization delay"); 145 time_t filedelay = 30; /* time to delay syncing files */ 146 SYSCTL_INT(_kern, OID_AUTO, filedelay, CTLFLAG_RW, &filedelay, 0, 147 "File synchronization delay"); 148 time_t dirdelay = 29; /* time to delay syncing directories */ 149 SYSCTL_INT(_kern, OID_AUTO, dirdelay, CTLFLAG_RW, &dirdelay, 0, 150 "Directory synchronization delay"); 151 time_t metadelay = 28; /* time to delay syncing metadata */ 152 SYSCTL_INT(_kern, OID_AUTO, metadelay, CTLFLAG_RW, &metadelay, 0, 153 "VFS metadata synchronization delay"); 154 static int rushjob; /* number of slots to run ASAP */ 155 static int stat_rush_requests; /* number of times I/O speeded up */ 156 SYSCTL_INT(_debug, OID_AUTO, rush_requests, CTLFLAG_RW, &stat_rush_requests, 0, ""); 157 158 static int syncer_delayno = 0; 159 static long syncer_mask; 160 LIST_HEAD(synclist, vnode); 161 static struct synclist *syncer_workitem_pending; 162 163 int desiredvnodes; 164 SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, 165 &desiredvnodes, 0, "Maximum number of vnodes"); 166 static int minvnodes; 167 SYSCTL_INT(_kern, OID_AUTO, minvnodes, CTLFLAG_RW, 168 &minvnodes, 0, "Minimum number of vnodes"); 169 static int vnlru_nowhere = 0; 170 SYSCTL_INT(_debug, OID_AUTO, vnlru_nowhere, CTLFLAG_RW, &vnlru_nowhere, 0, 171 "Number of times the vnlru process ran without success"); 172 173 static void vfs_free_addrlist (struct netexport *nep); 174 static int vfs_free_netcred (struct radix_node *rn, void *w); 175 static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep, 176 struct export_args *argp); 177 178 /* 179 * Initialize the vnode management data structures. 180 */ 181 void 182 vntblinit() 183 { 184 185 /* 186 * Desired vnodes is a result of the physical page count 187 * and the size of kernel's heap. It scales in proportion 188 * to the amount of available physical memory. This can 189 * cause trouble on 64-bit and large memory platforms. 190 */ 191 /* desiredvnodes = maxproc + vmstats.v_page_count / 4; */ 192 desiredvnodes = 193 min(maxproc + vmstats.v_page_count /4, 194 2 * (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 195 (5 * (sizeof(struct vm_object) + sizeof(struct vnode)))); 196 197 minvnodes = desiredvnodes / 4; 198 lwkt_inittoken(&mntvnode_token); 199 lwkt_inittoken(&mntid_token); 200 lwkt_inittoken(&spechash_token); 201 TAILQ_INIT(&vnode_free_list); 202 lwkt_inittoken(&vnode_free_list_token); 203 vnode_zone = zinit("VNODE", sizeof (struct vnode), 0, 0, 5); 204 /* 205 * Initialize the filesystem syncer. 206 */ 207 syncer_workitem_pending = hashinit(syncer_maxdelay, M_VNODE, 208 &syncer_mask); 209 syncer_maxdelay = syncer_mask + 1; 210 } 211 212 /* 213 * Mark a mount point as busy. Used to synchronize access and to delay 214 * unmounting. Interlock is not released on failure. 215 */ 216 int 217 vfs_busy(struct mount *mp, int flags, struct lwkt_token *interlkp, 218 struct thread *td) 219 { 220 int lkflags; 221 222 if (mp->mnt_kern_flag & MNTK_UNMOUNT) { 223 if (flags & LK_NOWAIT) 224 return (ENOENT); 225 mp->mnt_kern_flag |= MNTK_MWAIT; 226 if (interlkp) { 227 lwkt_reltoken(interlkp); 228 } 229 /* 230 * Since all busy locks are shared except the exclusive 231 * lock granted when unmounting, the only place that a 232 * wakeup needs to be done is at the release of the 233 * exclusive lock at the end of dounmount. 234 */ 235 tsleep((caddr_t)mp, 0, "vfs_busy", 0); 236 if (interlkp) { 237 lwkt_gettoken(interlkp); 238 } 239 return (ENOENT); 240 } 241 lkflags = LK_SHARED | LK_NOPAUSE; 242 if (interlkp) 243 lkflags |= LK_INTERLOCK; 244 if (lockmgr(&mp->mnt_lock, lkflags, interlkp, td)) 245 panic("vfs_busy: unexpected lock failure"); 246 return (0); 247 } 248 249 /* 250 * Free a busy filesystem. 251 */ 252 void 253 vfs_unbusy(struct mount *mp, struct thread *td) 254 { 255 lockmgr(&mp->mnt_lock, LK_RELEASE, NULL, td); 256 } 257 258 /* 259 * Lookup a filesystem type, and if found allocate and initialize 260 * a mount structure for it. 261 * 262 * Devname is usually updated by mount(8) after booting. 263 */ 264 int 265 vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp) 266 { 267 struct thread *td = curthread; /* XXX */ 268 struct vfsconf *vfsp; 269 struct mount *mp; 270 271 if (fstypename == NULL) 272 return (ENODEV); 273 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 274 if (!strcmp(vfsp->vfc_name, fstypename)) 275 break; 276 if (vfsp == NULL) 277 return (ENODEV); 278 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 279 bzero((char *)mp, (u_long)sizeof(struct mount)); 280 lockinit(&mp->mnt_lock, 0, "vfslock", VLKTIMEOUT, LK_NOPAUSE); 281 (void)vfs_busy(mp, LK_NOWAIT, 0, td); 282 TAILQ_INIT(&mp->mnt_nvnodelist); 283 TAILQ_INIT(&mp->mnt_reservedvnlist); 284 mp->mnt_nvnodelistsize = 0; 285 mp->mnt_vfc = vfsp; 286 mp->mnt_op = vfsp->vfc_vfsops; 287 mp->mnt_flag = MNT_RDONLY; 288 mp->mnt_vnodecovered = NULLVP; 289 vfsp->vfc_refcount++; 290 mp->mnt_iosize_max = DFLTPHYS; 291 mp->mnt_stat.f_type = vfsp->vfc_typenum; 292 mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK; 293 strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN); 294 mp->mnt_stat.f_mntonname[0] = '/'; 295 mp->mnt_stat.f_mntonname[1] = 0; 296 (void) copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0); 297 *mpp = mp; 298 return (0); 299 } 300 301 /* 302 * Find an appropriate filesystem to use for the root. If a filesystem 303 * has not been preselected, walk through the list of known filesystems 304 * trying those that have mountroot routines, and try them until one 305 * works or we have tried them all. 306 */ 307 #ifdef notdef /* XXX JH */ 308 int 309 lite2_vfs_mountroot() 310 { 311 struct vfsconf *vfsp; 312 extern int (*lite2_mountroot) (void); 313 int error; 314 315 if (lite2_mountroot != NULL) 316 return ((*lite2_mountroot)()); 317 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 318 if (vfsp->vfc_mountroot == NULL) 319 continue; 320 if ((error = (*vfsp->vfc_mountroot)()) == 0) 321 return (0); 322 printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error); 323 } 324 return (ENODEV); 325 } 326 #endif 327 328 /* 329 * Lookup a mount point by filesystem identifier. 330 */ 331 struct mount * 332 vfs_getvfs(fsid) 333 fsid_t *fsid; 334 { 335 struct mount *mp; 336 337 lwkt_gettoken(&mountlist_token); 338 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 339 if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && 340 mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { 341 lwkt_reltoken(&mountlist_token); 342 return (mp); 343 } 344 } 345 lwkt_reltoken(&mountlist_token); 346 return ((struct mount *) 0); 347 } 348 349 /* 350 * Get a new unique fsid. Try to make its val[0] unique, since this value 351 * will be used to create fake device numbers for stat(). Also try (but 352 * not so hard) make its val[0] unique mod 2^16, since some emulators only 353 * support 16-bit device numbers. We end up with unique val[0]'s for the 354 * first 2^16 calls and unique val[0]'s mod 2^16 for the first 2^8 calls. 355 * 356 * Keep in mind that several mounts may be running in parallel. Starting 357 * the search one past where the previous search terminated is both a 358 * micro-optimization and a defense against returning the same fsid to 359 * different mounts. 360 */ 361 void 362 vfs_getnewfsid(mp) 363 struct mount *mp; 364 { 365 static u_int16_t mntid_base; 366 fsid_t tfsid; 367 int mtype; 368 369 lwkt_gettoken(&mntid_token); 370 mtype = mp->mnt_vfc->vfc_typenum; 371 tfsid.val[1] = mtype; 372 mtype = (mtype & 0xFF) << 24; 373 for (;;) { 374 tfsid.val[0] = makeudev(255, 375 mtype | ((mntid_base & 0xFF00) << 8) | (mntid_base & 0xFF)); 376 mntid_base++; 377 if (vfs_getvfs(&tfsid) == NULL) 378 break; 379 } 380 mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; 381 mp->mnt_stat.f_fsid.val[1] = tfsid.val[1]; 382 lwkt_reltoken(&mntid_token); 383 } 384 385 /* 386 * Knob to control the precision of file timestamps: 387 * 388 * 0 = seconds only; nanoseconds zeroed. 389 * 1 = seconds and nanoseconds, accurate within 1/HZ. 390 * 2 = seconds and nanoseconds, truncated to microseconds. 391 * >=3 = seconds and nanoseconds, maximum precision. 392 */ 393 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; 394 395 static int timestamp_precision = TSP_SEC; 396 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, 397 ×tamp_precision, 0, ""); 398 399 /* 400 * Get a current timestamp. 401 */ 402 void 403 vfs_timestamp(tsp) 404 struct timespec *tsp; 405 { 406 struct timeval tv; 407 408 switch (timestamp_precision) { 409 case TSP_SEC: 410 tsp->tv_sec = time_second; 411 tsp->tv_nsec = 0; 412 break; 413 case TSP_HZ: 414 getnanotime(tsp); 415 break; 416 case TSP_USEC: 417 microtime(&tv); 418 TIMEVAL_TO_TIMESPEC(&tv, tsp); 419 break; 420 case TSP_NSEC: 421 default: 422 nanotime(tsp); 423 break; 424 } 425 } 426 427 /* 428 * Set vnode attributes to VNOVAL 429 */ 430 void 431 vattr_null(vap) 432 struct vattr *vap; 433 { 434 435 vap->va_type = VNON; 436 vap->va_size = VNOVAL; 437 vap->va_bytes = VNOVAL; 438 vap->va_mode = VNOVAL; 439 vap->va_nlink = VNOVAL; 440 vap->va_uid = VNOVAL; 441 vap->va_gid = VNOVAL; 442 vap->va_fsid = VNOVAL; 443 vap->va_fileid = VNOVAL; 444 vap->va_blocksize = VNOVAL; 445 vap->va_rdev = VNOVAL; 446 vap->va_atime.tv_sec = VNOVAL; 447 vap->va_atime.tv_nsec = VNOVAL; 448 vap->va_mtime.tv_sec = VNOVAL; 449 vap->va_mtime.tv_nsec = VNOVAL; 450 vap->va_ctime.tv_sec = VNOVAL; 451 vap->va_ctime.tv_nsec = VNOVAL; 452 vap->va_flags = VNOVAL; 453 vap->va_gen = VNOVAL; 454 vap->va_vaflags = 0; 455 } 456 457 /* 458 * This routine is called when we have too many vnodes. It attempts 459 * to free <count> vnodes and will potentially free vnodes that still 460 * have VM backing store (VM backing store is typically the cause 461 * of a vnode blowout so we want to do this). Therefore, this operation 462 * is not considered cheap. 463 * 464 * A number of conditions may prevent a vnode from being reclaimed. 465 * the buffer cache may have references on the vnode, a directory 466 * vnode may still have references due to the namei cache representing 467 * underlying files, or the vnode may be in active use. It is not 468 * desireable to reuse such vnodes. These conditions may cause the 469 * number of vnodes to reach some minimum value regardless of what 470 * you set kern.maxvnodes to. Do not set kern.maxvnodes too low. 471 */ 472 static int 473 vlrureclaim(struct mount *mp) 474 { 475 struct vnode *vp; 476 int done; 477 int trigger; 478 int usevnodes; 479 int count; 480 int gen; 481 482 /* 483 * Calculate the trigger point, don't allow user 484 * screwups to blow us up. This prevents us from 485 * recycling vnodes with lots of resident pages. We 486 * aren't trying to free memory, we are trying to 487 * free vnodes. 488 */ 489 usevnodes = desiredvnodes; 490 if (usevnodes <= 0) 491 usevnodes = 1; 492 trigger = vmstats.v_page_count * 2 / usevnodes; 493 494 done = 0; 495 gen = lwkt_gettoken(&mntvnode_token); 496 count = mp->mnt_nvnodelistsize / 10 + 1; 497 while (count && (vp = TAILQ_FIRST(&mp->mnt_nvnodelist)) != NULL) { 498 TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 499 TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 500 501 if (vp->v_type != VNON && 502 vp->v_type != VBAD && 503 VMIGHTFREE(vp) && /* critical path opt */ 504 (vp->v_object == NULL || vp->v_object->resident_page_count < trigger) 505 ) { 506 lwkt_gettoken(&vp->v_interlock); 507 if (lwkt_gentoken(&mntvnode_token, &gen) == 0) { 508 if (VMIGHTFREE(vp)) { 509 vgonel(vp, curthread); 510 done++; 511 } else { 512 lwkt_reltoken(&vp->v_interlock); 513 } 514 } else { 515 lwkt_reltoken(&vp->v_interlock); 516 } 517 } 518 --count; 519 } 520 lwkt_reltoken(&mntvnode_token); 521 return done; 522 } 523 524 /* 525 * Attempt to recycle vnodes in a context that is always safe to block. 526 * Calling vlrurecycle() from the bowels of file system code has some 527 * interesting deadlock problems. 528 */ 529 static struct thread *vnlruthread; 530 static int vnlruproc_sig; 531 532 static void 533 vnlru_proc(void) 534 { 535 struct mount *mp, *nmp; 536 int s; 537 int done; 538 struct thread *td = curthread; 539 540 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, 541 SHUTDOWN_PRI_FIRST); 542 543 s = splbio(); 544 for (;;) { 545 kproc_suspend_loop(); 546 if (numvnodes - freevnodes <= desiredvnodes * 9 / 10) { 547 vnlruproc_sig = 0; 548 wakeup(&vnlruproc_sig); 549 tsleep(td, 0, "vlruwt", hz); 550 continue; 551 } 552 done = 0; 553 lwkt_gettoken(&mountlist_token); 554 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 555 if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, td)) { 556 nmp = TAILQ_NEXT(mp, mnt_list); 557 continue; 558 } 559 done += vlrureclaim(mp); 560 lwkt_gettoken(&mountlist_token); 561 nmp = TAILQ_NEXT(mp, mnt_list); 562 vfs_unbusy(mp, td); 563 } 564 lwkt_reltoken(&mountlist_token); 565 if (done == 0) { 566 vnlru_nowhere++; 567 tsleep(td, 0, "vlrup", hz * 3); 568 } 569 } 570 splx(s); 571 } 572 573 static struct kproc_desc vnlru_kp = { 574 "vnlru", 575 vnlru_proc, 576 &vnlruthread 577 }; 578 SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &vnlru_kp) 579 580 /* 581 * Routines having to do with the management of the vnode table. 582 */ 583 extern vop_t **dead_vnodeop_p; 584 585 /* 586 * Return the next vnode from the free list. 587 */ 588 int 589 getnewvnode(tag, mp, vops, vpp) 590 enum vtagtype tag; 591 struct mount *mp; 592 vop_t **vops; 593 struct vnode **vpp; 594 { 595 int s; 596 int gen; 597 int vgen; 598 struct thread *td = curthread; /* XXX */ 599 struct vnode *vp = NULL; 600 vm_object_t object; 601 602 s = splbio(); 603 604 /* 605 * Try to reuse vnodes if we hit the max. This situation only 606 * occurs in certain large-memory (2G+) situations. We cannot 607 * attempt to directly reclaim vnodes due to nasty recursion 608 * problems. 609 */ 610 while (numvnodes - freevnodes > desiredvnodes) { 611 if (vnlruproc_sig == 0) { 612 vnlruproc_sig = 1; /* avoid unnecessary wakeups */ 613 wakeup(vnlruthread); 614 } 615 tsleep(&vnlruproc_sig, 0, "vlruwk", hz); 616 } 617 618 619 /* 620 * Attempt to reuse a vnode already on the free list, allocating 621 * a new vnode if we can't find one or if we have not reached a 622 * good minimum for good LRU performance. 623 */ 624 gen = lwkt_gettoken(&vnode_free_list_token); 625 if (freevnodes >= wantfreevnodes && numvnodes >= minvnodes) { 626 int count; 627 628 for (count = 0; count < freevnodes; count++) { 629 vp = TAILQ_FIRST(&vnode_free_list); 630 if (vp == NULL || vp->v_usecount) 631 panic("getnewvnode: free vnode isn't"); 632 633 /* 634 * Get the vnode's interlock, then re-obtain 635 * vnode_free_list_token in case we lost it. If we 636 * did lose it while getting the vnode interlock, 637 * even if we got it back again, then retry. 638 */ 639 vgen = lwkt_gettoken(&vp->v_interlock); 640 if (lwkt_gentoken(&vnode_free_list_token, &gen) != 0) { 641 --count; 642 lwkt_reltoken(&vp->v_interlock); 643 vp = NULL; 644 continue; 645 } 646 647 /* 648 * Whew! We have both tokens. Since we didn't lose 649 * the free list VFREE had better still be set. But 650 * we aren't out of the woods yet. We have to get 651 * the object (may block). If the vnode is not 652 * suitable then move it to the end of the list 653 * if we can. If we can't move it to the end of the 654 * list retry again. 655 */ 656 if ((VOP_GETVOBJECT(vp, &object) == 0 && 657 (object->resident_page_count || object->ref_count)) 658 ) { 659 if (lwkt_gentoken(&vp->v_interlock, &vgen) == 0 && 660 lwkt_gentoken(&vnode_free_list_token, &gen) == 0 661 ) { 662 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 663 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 664 } else { 665 --count; 666 } 667 lwkt_reltoken(&vp->v_interlock); 668 vp = NULL; 669 continue; 670 } 671 672 /* 673 * Still not out of the woods. VOBJECT might have 674 * blocked, if we did not retain our tokens we have 675 * to retry. 676 */ 677 if (lwkt_gentoken(&vp->v_interlock, &vgen) != 0 || 678 lwkt_gentoken(&vnode_free_list_token, &gen) != 0) { 679 --count; 680 vp = NULL; 681 continue; 682 } 683 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 684 KKASSERT(vp->v_flag & VFREE); 685 686 /* 687 * If we have children in the namecache we cannot 688 * reuse the vnode yet because it will break the 689 * namecache chain (YYY use nc_refs for the check?) 690 */ 691 if (TAILQ_FIRST(&vp->v_namecache)) { 692 if (cache_leaf_test(vp) < 0) { 693 lwkt_reltoken(&vp->v_interlock); 694 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 695 vp = NULL; 696 continue; 697 } 698 } 699 break; 700 } 701 } 702 703 if (vp) { 704 vp->v_flag |= VDOOMED; 705 vp->v_flag &= ~VFREE; 706 freevnodes--; 707 lwkt_reltoken(&vnode_free_list_token); 708 cache_purge(vp); /* YYY may block */ 709 vp->v_lease = NULL; 710 if (vp->v_type != VBAD) { 711 vgonel(vp, td); 712 } else { 713 lwkt_reltoken(&vp->v_interlock); 714 } 715 716 #ifdef INVARIANTS 717 { 718 int s; 719 720 if (vp->v_data) 721 panic("cleaned vnode isn't"); 722 s = splbio(); 723 if (vp->v_numoutput) 724 panic("Clean vnode has pending I/O's"); 725 splx(s); 726 } 727 #endif 728 vp->v_flag = 0; 729 vp->v_lastw = 0; 730 vp->v_lasta = 0; 731 vp->v_cstart = 0; 732 vp->v_clen = 0; 733 vp->v_socket = 0; 734 vp->v_writecount = 0; /* XXX */ 735 } else { 736 lwkt_reltoken(&vnode_free_list_token); 737 vp = (struct vnode *) zalloc(vnode_zone); 738 bzero((char *) vp, sizeof *vp); 739 lwkt_inittoken(&vp->v_interlock); 740 vp->v_dd = vp; 741 cache_purge(vp); 742 TAILQ_INIT(&vp->v_namecache); 743 numvnodes++; 744 } 745 746 TAILQ_INIT(&vp->v_cleanblkhd); 747 TAILQ_INIT(&vp->v_dirtyblkhd); 748 vp->v_type = VNON; 749 vp->v_tag = tag; 750 vp->v_op = vops; 751 insmntque(vp, mp); 752 *vpp = vp; 753 vp->v_usecount = 1; 754 vp->v_data = 0; 755 splx(s); 756 757 vfs_object_create(vp, td); 758 return (0); 759 } 760 761 /* 762 * Move a vnode from one mount queue to another. 763 */ 764 static void 765 insmntque(vp, mp) 766 struct vnode *vp; 767 struct mount *mp; 768 { 769 770 lwkt_gettoken(&mntvnode_token); 771 /* 772 * Delete from old mount point vnode list, if on one. 773 */ 774 if (vp->v_mount != NULL) { 775 KASSERT(vp->v_mount->mnt_nvnodelistsize > 0, 776 ("bad mount point vnode list size")); 777 TAILQ_REMOVE(&vp->v_mount->mnt_nvnodelist, vp, v_nmntvnodes); 778 vp->v_mount->mnt_nvnodelistsize--; 779 } 780 /* 781 * Insert into list of vnodes for the new mount point, if available. 782 */ 783 if ((vp->v_mount = mp) == NULL) { 784 lwkt_reltoken(&mntvnode_token); 785 return; 786 } 787 TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 788 mp->mnt_nvnodelistsize++; 789 lwkt_reltoken(&mntvnode_token); 790 } 791 792 /* 793 * Update outstanding I/O count and do wakeup if requested. 794 */ 795 void 796 vwakeup(bp) 797 struct buf *bp; 798 { 799 struct vnode *vp; 800 801 bp->b_flags &= ~B_WRITEINPROG; 802 if ((vp = bp->b_vp)) { 803 vp->v_numoutput--; 804 if (vp->v_numoutput < 0) 805 panic("vwakeup: neg numoutput"); 806 if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { 807 vp->v_flag &= ~VBWAIT; 808 wakeup((caddr_t) &vp->v_numoutput); 809 } 810 } 811 } 812 813 /* 814 * Flush out and invalidate all buffers associated with a vnode. 815 * Called with the underlying object locked. 816 */ 817 int 818 vinvalbuf(struct vnode *vp, int flags, struct thread *td, 819 int slpflag, int slptimeo) 820 { 821 struct buf *bp; 822 struct buf *nbp, *blist; 823 int s, error; 824 vm_object_t object; 825 826 if (flags & V_SAVE) { 827 s = splbio(); 828 while (vp->v_numoutput) { 829 vp->v_flag |= VBWAIT; 830 error = tsleep((caddr_t)&vp->v_numoutput, 831 slpflag, "vinvlbuf", slptimeo); 832 if (error) { 833 splx(s); 834 return (error); 835 } 836 } 837 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 838 splx(s); 839 if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) != 0) 840 return (error); 841 s = splbio(); 842 if (vp->v_numoutput > 0 || 843 !TAILQ_EMPTY(&vp->v_dirtyblkhd)) 844 panic("vinvalbuf: dirty bufs"); 845 } 846 splx(s); 847 } 848 s = splbio(); 849 for (;;) { 850 blist = TAILQ_FIRST(&vp->v_cleanblkhd); 851 if (!blist) 852 blist = TAILQ_FIRST(&vp->v_dirtyblkhd); 853 if (!blist) 854 break; 855 856 for (bp = blist; bp; bp = nbp) { 857 nbp = TAILQ_NEXT(bp, b_vnbufs); 858 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 859 error = BUF_TIMELOCK(bp, 860 LK_EXCLUSIVE | LK_SLEEPFAIL, 861 "vinvalbuf", slpflag, slptimeo); 862 if (error == ENOLCK) 863 break; 864 splx(s); 865 return (error); 866 } 867 /* 868 * XXX Since there are no node locks for NFS, I 869 * believe there is a slight chance that a delayed 870 * write will occur while sleeping just above, so 871 * check for it. Note that vfs_bio_awrite expects 872 * buffers to reside on a queue, while VOP_BWRITE and 873 * brelse do not. 874 */ 875 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && 876 (flags & V_SAVE)) { 877 878 if (bp->b_vp == vp) { 879 if (bp->b_flags & B_CLUSTEROK) { 880 BUF_UNLOCK(bp); 881 vfs_bio_awrite(bp); 882 } else { 883 bremfree(bp); 884 bp->b_flags |= B_ASYNC; 885 VOP_BWRITE(bp->b_vp, bp); 886 } 887 } else { 888 bremfree(bp); 889 (void) VOP_BWRITE(bp->b_vp, bp); 890 } 891 break; 892 } 893 bremfree(bp); 894 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF); 895 bp->b_flags &= ~B_ASYNC; 896 brelse(bp); 897 } 898 } 899 900 /* 901 * Wait for I/O to complete. XXX needs cleaning up. The vnode can 902 * have write I/O in-progress but if there is a VM object then the 903 * VM object can also have read-I/O in-progress. 904 */ 905 do { 906 while (vp->v_numoutput > 0) { 907 vp->v_flag |= VBWAIT; 908 tsleep(&vp->v_numoutput, 0, "vnvlbv", 0); 909 } 910 if (VOP_GETVOBJECT(vp, &object) == 0) { 911 while (object->paging_in_progress) 912 vm_object_pip_sleep(object, "vnvlbx"); 913 } 914 } while (vp->v_numoutput > 0); 915 916 splx(s); 917 918 /* 919 * Destroy the copy in the VM cache, too. 920 */ 921 lwkt_gettoken(&vp->v_interlock); 922 if (VOP_GETVOBJECT(vp, &object) == 0) { 923 vm_object_page_remove(object, 0, 0, 924 (flags & V_SAVE) ? TRUE : FALSE); 925 } 926 lwkt_reltoken(&vp->v_interlock); 927 928 if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) || !TAILQ_EMPTY(&vp->v_cleanblkhd)) 929 panic("vinvalbuf: flush failed"); 930 return (0); 931 } 932 933 /* 934 * Truncate a file's buffer and pages to a specified length. This 935 * is in lieu of the old vinvalbuf mechanism, which performed unneeded 936 * sync activity. 937 */ 938 int 939 vtruncbuf(struct vnode *vp, struct thread *td, off_t length, int blksize) 940 { 941 struct buf *bp; 942 struct buf *nbp; 943 int s, anyfreed; 944 int trunclbn; 945 946 /* 947 * Round up to the *next* lbn. 948 */ 949 trunclbn = (length + blksize - 1) / blksize; 950 951 s = splbio(); 952 restart: 953 anyfreed = 1; 954 for (;anyfreed;) { 955 anyfreed = 0; 956 for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { 957 nbp = TAILQ_NEXT(bp, b_vnbufs); 958 if (bp->b_lblkno >= trunclbn) { 959 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 960 BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); 961 goto restart; 962 } else { 963 bremfree(bp); 964 bp->b_flags |= (B_INVAL | B_RELBUF); 965 bp->b_flags &= ~B_ASYNC; 966 brelse(bp); 967 anyfreed = 1; 968 } 969 if (nbp && 970 (((nbp->b_xflags & BX_VNCLEAN) == 0) || 971 (nbp->b_vp != vp) || 972 (nbp->b_flags & B_DELWRI))) { 973 goto restart; 974 } 975 } 976 } 977 978 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 979 nbp = TAILQ_NEXT(bp, b_vnbufs); 980 if (bp->b_lblkno >= trunclbn) { 981 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 982 BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); 983 goto restart; 984 } else { 985 bremfree(bp); 986 bp->b_flags |= (B_INVAL | B_RELBUF); 987 bp->b_flags &= ~B_ASYNC; 988 brelse(bp); 989 anyfreed = 1; 990 } 991 if (nbp && 992 (((nbp->b_xflags & BX_VNDIRTY) == 0) || 993 (nbp->b_vp != vp) || 994 (nbp->b_flags & B_DELWRI) == 0)) { 995 goto restart; 996 } 997 } 998 } 999 } 1000 1001 if (length > 0) { 1002 restartsync: 1003 for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { 1004 nbp = TAILQ_NEXT(bp, b_vnbufs); 1005 if ((bp->b_flags & B_DELWRI) && (bp->b_lblkno < 0)) { 1006 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { 1007 BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); 1008 goto restart; 1009 } else { 1010 bremfree(bp); 1011 if (bp->b_vp == vp) { 1012 bp->b_flags |= B_ASYNC; 1013 } else { 1014 bp->b_flags &= ~B_ASYNC; 1015 } 1016 VOP_BWRITE(bp->b_vp, bp); 1017 } 1018 goto restartsync; 1019 } 1020 1021 } 1022 } 1023 1024 while (vp->v_numoutput > 0) { 1025 vp->v_flag |= VBWAIT; 1026 tsleep(&vp->v_numoutput, 0, "vbtrunc", 0); 1027 } 1028 1029 splx(s); 1030 1031 vnode_pager_setsize(vp, length); 1032 1033 return (0); 1034 } 1035 1036 /* 1037 * Associate a buffer with a vnode. 1038 */ 1039 void 1040 bgetvp(vp, bp) 1041 struct vnode *vp; 1042 struct buf *bp; 1043 { 1044 int s; 1045 1046 KASSERT(bp->b_vp == NULL, ("bgetvp: not free")); 1047 1048 vhold(vp); 1049 bp->b_vp = vp; 1050 bp->b_dev = vn_todev(vp); 1051 /* 1052 * Insert onto list for new vnode. 1053 */ 1054 s = splbio(); 1055 bp->b_xflags |= BX_VNCLEAN; 1056 bp->b_xflags &= ~BX_VNDIRTY; 1057 TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs); 1058 splx(s); 1059 } 1060 1061 /* 1062 * Disassociate a buffer from a vnode. 1063 */ 1064 void 1065 brelvp(bp) 1066 struct buf *bp; 1067 { 1068 struct vnode *vp; 1069 struct buflists *listheadp; 1070 int s; 1071 1072 KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); 1073 1074 /* 1075 * Delete from old vnode list, if on one. 1076 */ 1077 vp = bp->b_vp; 1078 s = splbio(); 1079 if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { 1080 if (bp->b_xflags & BX_VNDIRTY) 1081 listheadp = &vp->v_dirtyblkhd; 1082 else 1083 listheadp = &vp->v_cleanblkhd; 1084 TAILQ_REMOVE(listheadp, bp, b_vnbufs); 1085 bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); 1086 } 1087 if ((vp->v_flag & VONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) { 1088 vp->v_flag &= ~VONWORKLST; 1089 LIST_REMOVE(vp, v_synclist); 1090 } 1091 splx(s); 1092 bp->b_vp = (struct vnode *) 0; 1093 vdrop(vp); 1094 } 1095 1096 /* 1097 * The workitem queue. 1098 * 1099 * It is useful to delay writes of file data and filesystem metadata 1100 * for tens of seconds so that quickly created and deleted files need 1101 * not waste disk bandwidth being created and removed. To realize this, 1102 * we append vnodes to a "workitem" queue. When running with a soft 1103 * updates implementation, most pending metadata dependencies should 1104 * not wait for more than a few seconds. Thus, mounted on block devices 1105 * are delayed only about a half the time that file data is delayed. 1106 * Similarly, directory updates are more critical, so are only delayed 1107 * about a third the time that file data is delayed. Thus, there are 1108 * SYNCER_MAXDELAY queues that are processed round-robin at a rate of 1109 * one each second (driven off the filesystem syncer process). The 1110 * syncer_delayno variable indicates the next queue that is to be processed. 1111 * Items that need to be processed soon are placed in this queue: 1112 * 1113 * syncer_workitem_pending[syncer_delayno] 1114 * 1115 * A delay of fifteen seconds is done by placing the request fifteen 1116 * entries later in the queue: 1117 * 1118 * syncer_workitem_pending[(syncer_delayno + 15) & syncer_mask] 1119 * 1120 */ 1121 1122 /* 1123 * Add an item to the syncer work queue. 1124 */ 1125 static void 1126 vn_syncer_add_to_worklist(struct vnode *vp, int delay) 1127 { 1128 int s, slot; 1129 1130 s = splbio(); 1131 1132 if (vp->v_flag & VONWORKLST) { 1133 LIST_REMOVE(vp, v_synclist); 1134 } 1135 1136 if (delay > syncer_maxdelay - 2) 1137 delay = syncer_maxdelay - 2; 1138 slot = (syncer_delayno + delay) & syncer_mask; 1139 1140 LIST_INSERT_HEAD(&syncer_workitem_pending[slot], vp, v_synclist); 1141 vp->v_flag |= VONWORKLST; 1142 splx(s); 1143 } 1144 1145 struct thread *updatethread; 1146 static void sched_sync (void); 1147 static struct kproc_desc up_kp = { 1148 "syncer", 1149 sched_sync, 1150 &updatethread 1151 }; 1152 SYSINIT(syncer, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, &up_kp) 1153 1154 /* 1155 * System filesystem synchronizer daemon. 1156 */ 1157 void 1158 sched_sync(void) 1159 { 1160 struct synclist *slp; 1161 struct vnode *vp; 1162 long starttime; 1163 int s; 1164 struct thread *td = curthread; 1165 1166 EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, td, 1167 SHUTDOWN_PRI_LAST); 1168 1169 for (;;) { 1170 kproc_suspend_loop(); 1171 1172 starttime = time_second; 1173 1174 /* 1175 * Push files whose dirty time has expired. Be careful 1176 * of interrupt race on slp queue. 1177 */ 1178 s = splbio(); 1179 slp = &syncer_workitem_pending[syncer_delayno]; 1180 syncer_delayno += 1; 1181 if (syncer_delayno == syncer_maxdelay) 1182 syncer_delayno = 0; 1183 splx(s); 1184 1185 while ((vp = LIST_FIRST(slp)) != NULL) { 1186 if (VOP_ISLOCKED(vp, NULL) == 0) { 1187 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td); 1188 (void) VOP_FSYNC(vp, MNT_LAZY, td); 1189 VOP_UNLOCK(vp, 0, td); 1190 } 1191 s = splbio(); 1192 if (LIST_FIRST(slp) == vp) { 1193 /* 1194 * Note: v_tag VT_VFS vps can remain on the 1195 * worklist too with no dirty blocks, but 1196 * since sync_fsync() moves it to a different 1197 * slot we are safe. 1198 */ 1199 if (TAILQ_EMPTY(&vp->v_dirtyblkhd) && 1200 !vn_isdisk(vp, NULL)) 1201 panic("sched_sync: fsync failed vp %p tag %d", vp, vp->v_tag); 1202 /* 1203 * Put us back on the worklist. The worklist 1204 * routine will remove us from our current 1205 * position and then add us back in at a later 1206 * position. 1207 */ 1208 vn_syncer_add_to_worklist(vp, syncdelay); 1209 } 1210 splx(s); 1211 } 1212 1213 /* 1214 * Do soft update processing. 1215 */ 1216 if (bioops.io_sync) 1217 (*bioops.io_sync)(NULL); 1218 1219 /* 1220 * The variable rushjob allows the kernel to speed up the 1221 * processing of the filesystem syncer process. A rushjob 1222 * value of N tells the filesystem syncer to process the next 1223 * N seconds worth of work on its queue ASAP. Currently rushjob 1224 * is used by the soft update code to speed up the filesystem 1225 * syncer process when the incore state is getting so far 1226 * ahead of the disk that the kernel memory pool is being 1227 * threatened with exhaustion. 1228 */ 1229 if (rushjob > 0) { 1230 rushjob -= 1; 1231 continue; 1232 } 1233 /* 1234 * If it has taken us less than a second to process the 1235 * current work, then wait. Otherwise start right over 1236 * again. We can still lose time if any single round 1237 * takes more than two seconds, but it does not really 1238 * matter as we are just trying to generally pace the 1239 * filesystem activity. 1240 */ 1241 if (time_second == starttime) 1242 tsleep(&lbolt, 0, "syncer", 0); 1243 } 1244 } 1245 1246 /* 1247 * Request the syncer daemon to speed up its work. 1248 * We never push it to speed up more than half of its 1249 * normal turn time, otherwise it could take over the cpu. 1250 * 1251 * YYY wchan field protected by the BGL. 1252 */ 1253 int 1254 speedup_syncer() 1255 { 1256 crit_enter(); 1257 if (updatethread->td_wchan == &lbolt) { /* YYY */ 1258 unsleep(updatethread); 1259 lwkt_schedule(updatethread); 1260 } 1261 crit_exit(); 1262 if (rushjob < syncdelay / 2) { 1263 rushjob += 1; 1264 stat_rush_requests += 1; 1265 return (1); 1266 } 1267 return(0); 1268 } 1269 1270 /* 1271 * Associate a p-buffer with a vnode. 1272 * 1273 * Also sets B_PAGING flag to indicate that vnode is not fully associated 1274 * with the buffer. i.e. the bp has not been linked into the vnode or 1275 * ref-counted. 1276 */ 1277 void 1278 pbgetvp(vp, bp) 1279 struct vnode *vp; 1280 struct buf *bp; 1281 { 1282 1283 KASSERT(bp->b_vp == NULL, ("pbgetvp: not free")); 1284 1285 bp->b_vp = vp; 1286 bp->b_flags |= B_PAGING; 1287 bp->b_dev = vn_todev(vp); 1288 } 1289 1290 /* 1291 * Disassociate a p-buffer from a vnode. 1292 */ 1293 void 1294 pbrelvp(bp) 1295 struct buf *bp; 1296 { 1297 1298 KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL")); 1299 1300 /* XXX REMOVE ME */ 1301 if (TAILQ_NEXT(bp, b_vnbufs) != NULL) { 1302 panic( 1303 "relpbuf(): b_vp was probably reassignbuf()d %p %x", 1304 bp, 1305 (int)bp->b_flags 1306 ); 1307 } 1308 bp->b_vp = (struct vnode *) 0; 1309 bp->b_flags &= ~B_PAGING; 1310 } 1311 1312 void 1313 pbreassignbuf(bp, newvp) 1314 struct buf *bp; 1315 struct vnode *newvp; 1316 { 1317 if ((bp->b_flags & B_PAGING) == 0) { 1318 panic( 1319 "pbreassignbuf() on non phys bp %p", 1320 bp 1321 ); 1322 } 1323 bp->b_vp = newvp; 1324 } 1325 1326 /* 1327 * Reassign a buffer from one vnode to another. 1328 * Used to assign file specific control information 1329 * (indirect blocks) to the vnode to which they belong. 1330 */ 1331 void 1332 reassignbuf(bp, newvp) 1333 struct buf *bp; 1334 struct vnode *newvp; 1335 { 1336 struct buflists *listheadp; 1337 int delay; 1338 int s; 1339 1340 if (newvp == NULL) { 1341 printf("reassignbuf: NULL"); 1342 return; 1343 } 1344 ++reassignbufcalls; 1345 1346 /* 1347 * B_PAGING flagged buffers cannot be reassigned because their vp 1348 * is not fully linked in. 1349 */ 1350 if (bp->b_flags & B_PAGING) 1351 panic("cannot reassign paging buffer"); 1352 1353 s = splbio(); 1354 /* 1355 * Delete from old vnode list, if on one. 1356 */ 1357 if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { 1358 if (bp->b_xflags & BX_VNDIRTY) 1359 listheadp = &bp->b_vp->v_dirtyblkhd; 1360 else 1361 listheadp = &bp->b_vp->v_cleanblkhd; 1362 TAILQ_REMOVE(listheadp, bp, b_vnbufs); 1363 bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); 1364 if (bp->b_vp != newvp) { 1365 vdrop(bp->b_vp); 1366 bp->b_vp = NULL; /* for clarification */ 1367 } 1368 } 1369 /* 1370 * If dirty, put on list of dirty buffers; otherwise insert onto list 1371 * of clean buffers. 1372 */ 1373 if (bp->b_flags & B_DELWRI) { 1374 struct buf *tbp; 1375 1376 listheadp = &newvp->v_dirtyblkhd; 1377 if ((newvp->v_flag & VONWORKLST) == 0) { 1378 switch (newvp->v_type) { 1379 case VDIR: 1380 delay = dirdelay; 1381 break; 1382 case VCHR: 1383 case VBLK: 1384 if (newvp->v_specmountpoint != NULL) { 1385 delay = metadelay; 1386 break; 1387 } 1388 /* fall through */ 1389 default: 1390 delay = filedelay; 1391 } 1392 vn_syncer_add_to_worklist(newvp, delay); 1393 } 1394 bp->b_xflags |= BX_VNDIRTY; 1395 tbp = TAILQ_FIRST(listheadp); 1396 if (tbp == NULL || 1397 bp->b_lblkno == 0 || 1398 (bp->b_lblkno > 0 && tbp->b_lblkno < 0) || 1399 (bp->b_lblkno > 0 && bp->b_lblkno < tbp->b_lblkno)) { 1400 TAILQ_INSERT_HEAD(listheadp, bp, b_vnbufs); 1401 ++reassignbufsortgood; 1402 } else if (bp->b_lblkno < 0) { 1403 TAILQ_INSERT_TAIL(listheadp, bp, b_vnbufs); 1404 ++reassignbufsortgood; 1405 } else if (reassignbufmethod == 1) { 1406 /* 1407 * New sorting algorithm, only handle sequential case, 1408 * otherwise append to end (but before metadata) 1409 */ 1410 if ((tbp = gbincore(newvp, bp->b_lblkno - 1)) != NULL && 1411 (tbp->b_xflags & BX_VNDIRTY)) { 1412 /* 1413 * Found the best place to insert the buffer 1414 */ 1415 TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); 1416 ++reassignbufsortgood; 1417 } else { 1418 /* 1419 * Missed, append to end, but before meta-data. 1420 * We know that the head buffer in the list is 1421 * not meta-data due to prior conditionals. 1422 * 1423 * Indirect effects: NFS second stage write 1424 * tends to wind up here, giving maximum 1425 * distance between the unstable write and the 1426 * commit rpc. 1427 */ 1428 tbp = TAILQ_LAST(listheadp, buflists); 1429 while (tbp && tbp->b_lblkno < 0) 1430 tbp = TAILQ_PREV(tbp, buflists, b_vnbufs); 1431 TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); 1432 ++reassignbufsortbad; 1433 } 1434 } else { 1435 /* 1436 * Old sorting algorithm, scan queue and insert 1437 */ 1438 struct buf *ttbp; 1439 while ((ttbp = TAILQ_NEXT(tbp, b_vnbufs)) && 1440 (ttbp->b_lblkno < bp->b_lblkno)) { 1441 ++reassignbufloops; 1442 tbp = ttbp; 1443 } 1444 TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); 1445 } 1446 } else { 1447 bp->b_xflags |= BX_VNCLEAN; 1448 TAILQ_INSERT_TAIL(&newvp->v_cleanblkhd, bp, b_vnbufs); 1449 if ((newvp->v_flag & VONWORKLST) && 1450 TAILQ_EMPTY(&newvp->v_dirtyblkhd)) { 1451 newvp->v_flag &= ~VONWORKLST; 1452 LIST_REMOVE(newvp, v_synclist); 1453 } 1454 } 1455 if (bp->b_vp != newvp) { 1456 bp->b_vp = newvp; 1457 vhold(bp->b_vp); 1458 } 1459 splx(s); 1460 } 1461 1462 /* 1463 * Create a vnode for a block device. 1464 * Used for mounting the root file system. 1465 */ 1466 int 1467 bdevvp(dev, vpp) 1468 dev_t dev; 1469 struct vnode **vpp; 1470 { 1471 struct vnode *vp; 1472 struct vnode *nvp; 1473 int error; 1474 1475 if (dev == NODEV) { 1476 *vpp = NULLVP; 1477 return (ENXIO); 1478 } 1479 error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); 1480 if (error) { 1481 *vpp = NULLVP; 1482 return (error); 1483 } 1484 vp = nvp; 1485 vp->v_type = VBLK; 1486 addalias(vp, dev); 1487 *vpp = vp; 1488 return (0); 1489 } 1490 1491 /* 1492 * Add a vnode to the alias list hung off the dev_t. 1493 * 1494 * The reason for this gunk is that multiple vnodes can reference 1495 * the same physical device, so checking vp->v_usecount to see 1496 * how many users there are is inadequate; the v_usecount for 1497 * the vnodes need to be accumulated. vcount() does that. 1498 */ 1499 void 1500 addaliasu(struct vnode *nvp, udev_t nvp_rdev) 1501 { 1502 dev_t dev; 1503 1504 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 1505 panic("addaliasu on non-special vnode"); 1506 dev = udev2dev(nvp_rdev, nvp->v_type == VBLK ? 1 : 0); 1507 if (dev != NODEV) { 1508 nvp->v_rdev = dev; 1509 addalias(nvp, dev); 1510 } else 1511 nvp->v_rdev = NULL; 1512 } 1513 1514 void 1515 addalias(struct vnode *nvp, dev_t dev) 1516 { 1517 1518 if (nvp->v_type != VBLK && nvp->v_type != VCHR) 1519 panic("addalias on non-special vnode"); 1520 1521 nvp->v_rdev = dev; 1522 lwkt_gettoken(&spechash_token); 1523 SLIST_INSERT_HEAD(&dev->si_hlist, nvp, v_specnext); 1524 lwkt_reltoken(&spechash_token); 1525 } 1526 1527 /* 1528 * Grab a particular vnode from the free list, increment its 1529 * reference count and lock it. The vnode lock bit is set if the 1530 * vnode is being eliminated in vgone. The process is awakened 1531 * when the transition is completed, and an error returned to 1532 * indicate that the vnode is no longer usable (possibly having 1533 * been changed to a new file system type). 1534 */ 1535 int 1536 vget(vp, flags, td) 1537 struct vnode *vp; 1538 int flags; 1539 struct thread *td; 1540 { 1541 int error; 1542 1543 /* 1544 * If the vnode is in the process of being cleaned out for 1545 * another use, we wait for the cleaning to finish and then 1546 * return failure. Cleaning is determined by checking that 1547 * the VXLOCK flag is set. 1548 */ 1549 if (vp->v_flag & VXLOCK) { 1550 if (vp->v_vxproc == curproc) { 1551 #if 0 1552 /* this can now occur in normal operation */ 1553 log(LOG_INFO, "VXLOCK interlock avoided\n"); 1554 #endif 1555 } else { 1556 vp->v_flag |= VXWANT; 1557 tsleep((caddr_t)vp, 0, "vget", 0); 1558 return (ENOENT); 1559 } 1560 } 1561 1562 /* 1563 * Bump v_usecount to prevent the vnode from being cleaned. If the 1564 * vnode gets cleaned unexpectedly we could wind up calling lockmgr 1565 * on a lock embedded in an inode which is then ripped out from 1566 * it. 1567 */ 1568 vp->v_usecount++; /* XXX MP */ 1569 1570 if ((flags & LK_INTERLOCK) == 0) { 1571 lwkt_gettoken(&vp->v_interlock); 1572 } 1573 1574 if (VSHOULDBUSY(vp)) 1575 vbusy(vp); 1576 if (flags & LK_TYPE_MASK) { 1577 if ((error = vn_lock(vp, flags | LK_INTERLOCK, td)) != 0) { 1578 /* 1579 * must expand vrele here because we do not want 1580 * to call VOP_INACTIVE if the reference count 1581 * drops back to zero since it was never really 1582 * active. We must remove it from the free list 1583 * before sleeping so that multiple processes do 1584 * not try to recycle it. 1585 */ 1586 lwkt_gettoken(&vp->v_interlock); 1587 vp->v_usecount--; 1588 if (VSHOULDFREE(vp)) 1589 vfree(vp); 1590 else 1591 vlruvp(vp); 1592 lwkt_reltoken(&vp->v_interlock); 1593 } 1594 return (error); 1595 } 1596 lwkt_reltoken(&vp->v_interlock); 1597 return (0); 1598 } 1599 1600 void 1601 vref(struct vnode *vp) 1602 { 1603 vp->v_usecount++; /* XXX MP */ 1604 } 1605 1606 /* 1607 * Vnode put/release. 1608 * If count drops to zero, call inactive routine and return to freelist. 1609 */ 1610 void 1611 vrele(struct vnode *vp) 1612 { 1613 struct thread *td = curthread; /* XXX */ 1614 1615 KASSERT(vp != NULL, ("vrele: null vp")); 1616 1617 lwkt_gettoken(&vp->v_interlock); 1618 1619 if (vp->v_usecount > 1) { 1620 1621 vp->v_usecount--; 1622 lwkt_reltoken(&vp->v_interlock); 1623 1624 return; 1625 } 1626 1627 if (vp->v_usecount == 1) { 1628 vp->v_usecount--; 1629 /* 1630 * We must call VOP_INACTIVE with the node locked. 1631 * If we are doing a vpu, the node is already locked, 1632 * but, in the case of vrele, we must explicitly lock 1633 * the vnode before calling VOP_INACTIVE 1634 */ 1635 1636 if (vn_lock(vp, LK_EXCLUSIVE | LK_INTERLOCK, td) == 0) 1637 VOP_INACTIVE(vp, td); 1638 if (VSHOULDFREE(vp)) 1639 vfree(vp); 1640 else 1641 vlruvp(vp); 1642 } else { 1643 #ifdef DIAGNOSTIC 1644 vprint("vrele: negative ref count", vp); 1645 lwkt_reltoken(&vp->v_interlock); 1646 #endif 1647 panic("vrele: negative ref cnt"); 1648 } 1649 } 1650 1651 void 1652 vput(struct vnode *vp) 1653 { 1654 struct thread *td = curthread; /* XXX */ 1655 1656 KASSERT(vp != NULL, ("vput: null vp")); 1657 1658 lwkt_gettoken(&vp->v_interlock); 1659 1660 if (vp->v_usecount > 1) { 1661 vp->v_usecount--; 1662 VOP_UNLOCK(vp, LK_INTERLOCK, td); 1663 return; 1664 } 1665 1666 if (vp->v_usecount == 1) { 1667 vp->v_usecount--; 1668 /* 1669 * We must call VOP_INACTIVE with the node locked. 1670 * If we are doing a vpu, the node is already locked, 1671 * so we just need to release the vnode mutex. 1672 */ 1673 lwkt_reltoken(&vp->v_interlock); 1674 VOP_INACTIVE(vp, td); 1675 if (VSHOULDFREE(vp)) 1676 vfree(vp); 1677 else 1678 vlruvp(vp); 1679 } else { 1680 #ifdef DIAGNOSTIC 1681 vprint("vput: negative ref count", vp); 1682 #endif 1683 panic("vput: negative ref cnt"); 1684 } 1685 } 1686 1687 /* 1688 * Somebody doesn't want the vnode recycled. 1689 */ 1690 void 1691 vhold(vp) 1692 struct vnode *vp; 1693 { 1694 int s; 1695 1696 s = splbio(); 1697 vp->v_holdcnt++; 1698 if (VSHOULDBUSY(vp)) 1699 vbusy(vp); 1700 splx(s); 1701 } 1702 1703 /* 1704 * One less who cares about this vnode. 1705 */ 1706 void 1707 vdrop(vp) 1708 struct vnode *vp; 1709 { 1710 int s; 1711 1712 s = splbio(); 1713 if (vp->v_holdcnt <= 0) 1714 panic("vdrop: holdcnt"); 1715 vp->v_holdcnt--; 1716 if (VSHOULDFREE(vp)) 1717 vfree(vp); 1718 splx(s); 1719 } 1720 1721 /* 1722 * Remove any vnodes in the vnode table belonging to mount point mp. 1723 * 1724 * If FORCECLOSE is not specified, there should not be any active ones, 1725 * return error if any are found (nb: this is a user error, not a 1726 * system error). If FORCECLOSE is specified, detach any active vnodes 1727 * that are found. 1728 * 1729 * If WRITECLOSE is set, only flush out regular file vnodes open for 1730 * writing. 1731 * 1732 * SKIPSYSTEM causes any vnodes marked VSYSTEM to be skipped. 1733 * 1734 * `rootrefs' specifies the base reference count for the root vnode 1735 * of this filesystem. The root vnode is considered busy if its 1736 * v_usecount exceeds this value. On a successful return, vflush() 1737 * will call vrele() on the root vnode exactly rootrefs times. 1738 * If the SKIPSYSTEM or WRITECLOSE flags are specified, rootrefs must 1739 * be zero. 1740 */ 1741 #ifdef DIAGNOSTIC 1742 static int busyprt = 0; /* print out busy vnodes */ 1743 SYSCTL_INT(_debug, OID_AUTO, busyprt, CTLFLAG_RW, &busyprt, 0, ""); 1744 #endif 1745 1746 int 1747 vflush(mp, rootrefs, flags) 1748 struct mount *mp; 1749 int rootrefs; 1750 int flags; 1751 { 1752 struct thread *td = curthread; /* XXX */ 1753 struct vnode *vp, *nvp, *rootvp = NULL; 1754 struct vattr vattr; 1755 int busy = 0, error; 1756 1757 if (rootrefs > 0) { 1758 KASSERT((flags & (SKIPSYSTEM | WRITECLOSE)) == 0, 1759 ("vflush: bad args")); 1760 /* 1761 * Get the filesystem root vnode. We can vput() it 1762 * immediately, since with rootrefs > 0, it won't go away. 1763 */ 1764 if ((error = VFS_ROOT(mp, &rootvp)) != 0) 1765 return (error); 1766 vput(rootvp); 1767 } 1768 lwkt_gettoken(&mntvnode_token); 1769 loop: 1770 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp; vp = nvp) { 1771 /* 1772 * Make sure this vnode wasn't reclaimed in getnewvnode(). 1773 * Start over if it has (it won't be on the list anymore). 1774 */ 1775 if (vp->v_mount != mp) 1776 goto loop; 1777 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 1778 1779 lwkt_gettoken(&vp->v_interlock); 1780 /* 1781 * Skip over a vnodes marked VSYSTEM. 1782 */ 1783 if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) { 1784 lwkt_reltoken(&vp->v_interlock); 1785 continue; 1786 } 1787 /* 1788 * If WRITECLOSE is set, flush out unlinked but still open 1789 * files (even if open only for reading) and regular file 1790 * vnodes open for writing. 1791 */ 1792 if ((flags & WRITECLOSE) && 1793 (vp->v_type == VNON || 1794 (VOP_GETATTR(vp, &vattr, td) == 0 && 1795 vattr.va_nlink > 0)) && 1796 (vp->v_writecount == 0 || vp->v_type != VREG)) { 1797 lwkt_reltoken(&vp->v_interlock); 1798 continue; 1799 } 1800 1801 /* 1802 * With v_usecount == 0, all we need to do is clear out the 1803 * vnode data structures and we are done. 1804 */ 1805 if (vp->v_usecount == 0) { 1806 lwkt_reltoken(&mntvnode_token); 1807 vgonel(vp, td); 1808 lwkt_gettoken(&mntvnode_token); 1809 continue; 1810 } 1811 1812 /* 1813 * If FORCECLOSE is set, forcibly close the vnode. For block 1814 * or character devices, revert to an anonymous device. For 1815 * all other files, just kill them. 1816 */ 1817 if (flags & FORCECLOSE) { 1818 lwkt_reltoken(&mntvnode_token); 1819 if (vp->v_type != VBLK && vp->v_type != VCHR) { 1820 vgonel(vp, td); 1821 } else { 1822 vclean(vp, 0, td); 1823 vp->v_op = spec_vnodeop_p; 1824 insmntque(vp, (struct mount *) 0); 1825 } 1826 lwkt_gettoken(&mntvnode_token); 1827 continue; 1828 } 1829 #ifdef DIAGNOSTIC 1830 if (busyprt) 1831 vprint("vflush: busy vnode", vp); 1832 #endif 1833 lwkt_reltoken(&vp->v_interlock); 1834 busy++; 1835 } 1836 lwkt_reltoken(&mntvnode_token); 1837 if (rootrefs > 0 && (flags & FORCECLOSE) == 0) { 1838 /* 1839 * If just the root vnode is busy, and if its refcount 1840 * is equal to `rootrefs', then go ahead and kill it. 1841 */ 1842 lwkt_gettoken(&rootvp->v_interlock); 1843 KASSERT(busy > 0, ("vflush: not busy")); 1844 KASSERT(rootvp->v_usecount >= rootrefs, ("vflush: rootrefs")); 1845 if (busy == 1 && rootvp->v_usecount == rootrefs) { 1846 vgonel(rootvp, td); 1847 busy = 0; 1848 } else 1849 lwkt_reltoken(&rootvp->v_interlock); 1850 } 1851 if (busy) 1852 return (EBUSY); 1853 for (; rootrefs > 0; rootrefs--) 1854 vrele(rootvp); 1855 return (0); 1856 } 1857 1858 /* 1859 * We do not want to recycle the vnode too quickly. 1860 * 1861 * XXX we can't move vp's around the nvnodelist without really screwing 1862 * up the efficiency of filesystem SYNC and friends. This code is 1863 * disabled until we fix the syncing code's scanning algorithm. 1864 */ 1865 static void 1866 vlruvp(struct vnode *vp) 1867 { 1868 #if 0 1869 struct mount *mp; 1870 1871 if ((mp = vp->v_mount) != NULL) { 1872 lwkt_gettoken(&mntvnode_token); 1873 TAILQ_REMOVE(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 1874 TAILQ_INSERT_TAIL(&mp->mnt_nvnodelist, vp, v_nmntvnodes); 1875 lwkt_reltoken(&mntvnode_token); 1876 } 1877 #endif 1878 } 1879 1880 /* 1881 * Disassociate the underlying file system from a vnode. 1882 */ 1883 static void 1884 vclean(struct vnode *vp, int flags, struct thread *td) 1885 { 1886 int active; 1887 1888 /* 1889 * Check to see if the vnode is in use. If so we have to reference it 1890 * before we clean it out so that its count cannot fall to zero and 1891 * generate a race against ourselves to recycle it. 1892 */ 1893 if ((active = vp->v_usecount)) 1894 vp->v_usecount++; 1895 1896 /* 1897 * Prevent the vnode from being recycled or brought into use while we 1898 * clean it out. 1899 */ 1900 if (vp->v_flag & VXLOCK) 1901 panic("vclean: deadlock"); 1902 vp->v_flag |= VXLOCK; 1903 vp->v_vxproc = curproc; 1904 /* 1905 * Even if the count is zero, the VOP_INACTIVE routine may still 1906 * have the object locked while it cleans it out. The VOP_LOCK 1907 * ensures that the VOP_INACTIVE routine is done with its work. 1908 * For active vnodes, it ensures that no other activity can 1909 * occur while the underlying object is being cleaned out. 1910 */ 1911 VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK, td); 1912 1913 /* 1914 * Clean out any buffers associated with the vnode. 1915 */ 1916 vinvalbuf(vp, V_SAVE, td, 0, 0); 1917 1918 VOP_DESTROYVOBJECT(vp); 1919 1920 /* 1921 * If purging an active vnode, it must be closed and 1922 * deactivated before being reclaimed. Note that the 1923 * VOP_INACTIVE will unlock the vnode. 1924 */ 1925 if (active) { 1926 if (flags & DOCLOSE) 1927 VOP_CLOSE(vp, FNONBLOCK, td); 1928 VOP_INACTIVE(vp, td); 1929 } else { 1930 /* 1931 * Any other processes trying to obtain this lock must first 1932 * wait for VXLOCK to clear, then call the new lock operation. 1933 */ 1934 VOP_UNLOCK(vp, 0, td); 1935 } 1936 /* 1937 * Reclaim the vnode. 1938 */ 1939 if (VOP_RECLAIM(vp, td)) 1940 panic("vclean: cannot reclaim"); 1941 1942 if (active) { 1943 /* 1944 * Inline copy of vrele() since VOP_INACTIVE 1945 * has already been called. 1946 */ 1947 lwkt_gettoken(&vp->v_interlock); 1948 if (--vp->v_usecount <= 0) { 1949 #ifdef DIAGNOSTIC 1950 if (vp->v_usecount < 0 || vp->v_writecount != 0) { 1951 vprint("vclean: bad ref count", vp); 1952 panic("vclean: ref cnt"); 1953 } 1954 #endif 1955 vfree(vp); 1956 } 1957 lwkt_reltoken(&vp->v_interlock); 1958 } 1959 1960 cache_purge(vp); 1961 vp->v_vnlock = NULL; 1962 1963 if (VSHOULDFREE(vp)) 1964 vfree(vp); 1965 1966 /* 1967 * Done with purge, notify sleepers of the grim news. 1968 */ 1969 vp->v_op = dead_vnodeop_p; 1970 vn_pollgone(vp); 1971 vp->v_tag = VT_NON; 1972 vp->v_flag &= ~VXLOCK; 1973 vp->v_vxproc = NULL; 1974 if (vp->v_flag & VXWANT) { 1975 vp->v_flag &= ~VXWANT; 1976 wakeup((caddr_t) vp); 1977 } 1978 } 1979 1980 /* 1981 * Eliminate all activity associated with the requested vnode 1982 * and with all vnodes aliased to the requested vnode. 1983 */ 1984 int 1985 vop_revoke(ap) 1986 struct vop_revoke_args /* { 1987 struct vnode *a_vp; 1988 int a_flags; 1989 } */ *ap; 1990 { 1991 struct vnode *vp, *vq; 1992 dev_t dev; 1993 1994 KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke")); 1995 1996 vp = ap->a_vp; 1997 /* 1998 * If a vgone (or vclean) is already in progress, 1999 * wait until it is done and return. 2000 */ 2001 if (vp->v_flag & VXLOCK) { 2002 vp->v_flag |= VXWANT; 2003 lwkt_reltoken(&vp->v_interlock); 2004 tsleep((caddr_t)vp, 0, "vop_revokeall", 0); 2005 return (0); 2006 } 2007 dev = vp->v_rdev; 2008 for (;;) { 2009 lwkt_gettoken(&spechash_token); 2010 vq = SLIST_FIRST(&dev->si_hlist); 2011 lwkt_reltoken(&spechash_token); 2012 if (!vq) 2013 break; 2014 vgone(vq); 2015 } 2016 return (0); 2017 } 2018 2019 /* 2020 * Recycle an unused vnode to the front of the free list. 2021 * Release the passed interlock if the vnode will be recycled. 2022 */ 2023 int 2024 vrecycle(struct vnode *vp, struct lwkt_token *inter_lkp, struct thread *td) 2025 { 2026 lwkt_gettoken(&vp->v_interlock); 2027 if (vp->v_usecount == 0) { 2028 if (inter_lkp) { 2029 lwkt_reltoken(inter_lkp); 2030 } 2031 vgonel(vp, td); 2032 return (1); 2033 } 2034 lwkt_reltoken(&vp->v_interlock); 2035 return (0); 2036 } 2037 2038 /* 2039 * Eliminate all activity associated with a vnode 2040 * in preparation for reuse. 2041 */ 2042 void 2043 vgone(struct vnode *vp) 2044 { 2045 struct thread *td = curthread; /* XXX */ 2046 2047 lwkt_gettoken(&vp->v_interlock); 2048 vgonel(vp, td); 2049 } 2050 2051 /* 2052 * vgone, with the vp interlock held. 2053 */ 2054 void 2055 vgonel(struct vnode *vp, struct thread *td) 2056 { 2057 int s; 2058 2059 /* 2060 * If a vgone (or vclean) is already in progress, 2061 * wait until it is done and return. 2062 */ 2063 if (vp->v_flag & VXLOCK) { 2064 vp->v_flag |= VXWANT; 2065 lwkt_reltoken(&vp->v_interlock); 2066 tsleep((caddr_t)vp, 0, "vgone", 0); 2067 return; 2068 } 2069 2070 /* 2071 * Clean out the filesystem specific data. 2072 */ 2073 vclean(vp, DOCLOSE, td); 2074 lwkt_gettoken(&vp->v_interlock); 2075 2076 /* 2077 * Delete from old mount point vnode list, if on one. 2078 */ 2079 if (vp->v_mount != NULL) 2080 insmntque(vp, (struct mount *)0); 2081 /* 2082 * If special device, remove it from special device alias list 2083 * if it is on one. 2084 */ 2085 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) { 2086 lwkt_gettoken(&spechash_token); 2087 SLIST_REMOVE(&vp->v_hashchain, vp, vnode, v_specnext); 2088 freedev(vp->v_rdev); 2089 lwkt_reltoken(&spechash_token); 2090 vp->v_rdev = NULL; 2091 } 2092 2093 /* 2094 * If it is on the freelist and not already at the head, 2095 * move it to the head of the list. The test of the 2096 * VDOOMED flag and the reference count of zero is because 2097 * it will be removed from the free list by getnewvnode, 2098 * but will not have its reference count incremented until 2099 * after calling vgone. If the reference count were 2100 * incremented first, vgone would (incorrectly) try to 2101 * close the previous instance of the underlying object. 2102 */ 2103 if (vp->v_usecount == 0 && !(vp->v_flag & VDOOMED)) { 2104 s = splbio(); 2105 lwkt_gettoken(&vnode_free_list_token); 2106 if (vp->v_flag & VFREE) 2107 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 2108 else 2109 freevnodes++; 2110 vp->v_flag |= VFREE; 2111 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 2112 lwkt_reltoken(&vnode_free_list_token); 2113 splx(s); 2114 } 2115 2116 vp->v_type = VBAD; 2117 lwkt_reltoken(&vp->v_interlock); 2118 } 2119 2120 /* 2121 * Lookup a vnode by device number. 2122 */ 2123 int 2124 vfinddev(dev, type, vpp) 2125 dev_t dev; 2126 enum vtype type; 2127 struct vnode **vpp; 2128 { 2129 struct vnode *vp; 2130 2131 lwkt_gettoken(&spechash_token); 2132 SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { 2133 if (type == vp->v_type) { 2134 *vpp = vp; 2135 lwkt_reltoken(&spechash_token); 2136 return (1); 2137 } 2138 } 2139 lwkt_reltoken(&spechash_token); 2140 return (0); 2141 } 2142 2143 /* 2144 * Calculate the total number of references to a special device. 2145 */ 2146 int 2147 vcount(vp) 2148 struct vnode *vp; 2149 { 2150 struct vnode *vq; 2151 int count; 2152 2153 count = 0; 2154 lwkt_gettoken(&spechash_token); 2155 SLIST_FOREACH(vq, &vp->v_hashchain, v_specnext) 2156 count += vq->v_usecount; 2157 lwkt_reltoken(&spechash_token); 2158 return (count); 2159 } 2160 2161 /* 2162 * Same as above, but using the dev_t as argument 2163 */ 2164 2165 int 2166 count_dev(dev) 2167 dev_t dev; 2168 { 2169 struct vnode *vp; 2170 2171 vp = SLIST_FIRST(&dev->si_hlist); 2172 if (vp == NULL) 2173 return (0); 2174 return(vcount(vp)); 2175 } 2176 2177 /* 2178 * Print out a description of a vnode. 2179 */ 2180 static char *typename[] = 2181 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; 2182 2183 void 2184 vprint(label, vp) 2185 char *label; 2186 struct vnode *vp; 2187 { 2188 char buf[96]; 2189 2190 if (label != NULL) 2191 printf("%s: %p: ", label, (void *)vp); 2192 else 2193 printf("%p: ", (void *)vp); 2194 printf("type %s, usecount %d, writecount %d, refcount %d,", 2195 typename[vp->v_type], vp->v_usecount, vp->v_writecount, 2196 vp->v_holdcnt); 2197 buf[0] = '\0'; 2198 if (vp->v_flag & VROOT) 2199 strcat(buf, "|VROOT"); 2200 if (vp->v_flag & VTEXT) 2201 strcat(buf, "|VTEXT"); 2202 if (vp->v_flag & VSYSTEM) 2203 strcat(buf, "|VSYSTEM"); 2204 if (vp->v_flag & VXLOCK) 2205 strcat(buf, "|VXLOCK"); 2206 if (vp->v_flag & VXWANT) 2207 strcat(buf, "|VXWANT"); 2208 if (vp->v_flag & VBWAIT) 2209 strcat(buf, "|VBWAIT"); 2210 if (vp->v_flag & VDOOMED) 2211 strcat(buf, "|VDOOMED"); 2212 if (vp->v_flag & VFREE) 2213 strcat(buf, "|VFREE"); 2214 if (vp->v_flag & VOBJBUF) 2215 strcat(buf, "|VOBJBUF"); 2216 if (buf[0] != '\0') 2217 printf(" flags (%s)", &buf[1]); 2218 if (vp->v_data == NULL) { 2219 printf("\n"); 2220 } else { 2221 printf("\n\t"); 2222 VOP_PRINT(vp); 2223 } 2224 } 2225 2226 #ifdef DDB 2227 #include <ddb/ddb.h> 2228 /* 2229 * List all of the locked vnodes in the system. 2230 * Called when debugging the kernel. 2231 */ 2232 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes) 2233 { 2234 struct thread *td = curthread; /* XXX */ 2235 struct mount *mp, *nmp; 2236 struct vnode *vp; 2237 2238 printf("Locked vnodes\n"); 2239 lwkt_gettoken(&mountlist_token); 2240 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 2241 if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, td)) { 2242 nmp = TAILQ_NEXT(mp, mnt_list); 2243 continue; 2244 } 2245 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { 2246 if (VOP_ISLOCKED(vp, NULL)) 2247 vprint((char *)0, vp); 2248 } 2249 lwkt_gettoken(&mountlist_token); 2250 nmp = TAILQ_NEXT(mp, mnt_list); 2251 vfs_unbusy(mp, td); 2252 } 2253 lwkt_reltoken(&mountlist_token); 2254 } 2255 #endif 2256 2257 /* 2258 * Top level filesystem related information gathering. 2259 */ 2260 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS); 2261 2262 static int 2263 vfs_sysctl(SYSCTL_HANDLER_ARGS) 2264 { 2265 int *name = (int *)arg1 - 1; /* XXX */ 2266 u_int namelen = arg2 + 1; /* XXX */ 2267 struct vfsconf *vfsp; 2268 2269 #if 1 || defined(COMPAT_PRELITE2) 2270 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ 2271 if (namelen == 1) 2272 return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); 2273 #endif 2274 2275 #ifdef notyet 2276 /* all sysctl names at this level are at least name and field */ 2277 if (namelen < 2) 2278 return (ENOTDIR); /* overloaded */ 2279 if (name[0] != VFS_GENERIC) { 2280 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 2281 if (vfsp->vfc_typenum == name[0]) 2282 break; 2283 if (vfsp == NULL) 2284 return (EOPNOTSUPP); 2285 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, 2286 oldp, oldlenp, newp, newlen, p)); 2287 } 2288 #endif 2289 switch (name[1]) { 2290 case VFS_MAXTYPENUM: 2291 if (namelen != 2) 2292 return (ENOTDIR); 2293 return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); 2294 case VFS_CONF: 2295 if (namelen != 3) 2296 return (ENOTDIR); /* overloaded */ 2297 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) 2298 if (vfsp->vfc_typenum == name[2]) 2299 break; 2300 if (vfsp == NULL) 2301 return (EOPNOTSUPP); 2302 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); 2303 } 2304 return (EOPNOTSUPP); 2305 } 2306 2307 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, 2308 "Generic filesystem"); 2309 2310 #if 1 || defined(COMPAT_PRELITE2) 2311 2312 static int 2313 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) 2314 { 2315 int error; 2316 struct vfsconf *vfsp; 2317 struct ovfsconf ovfs; 2318 2319 for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { 2320 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ 2321 strcpy(ovfs.vfc_name, vfsp->vfc_name); 2322 ovfs.vfc_index = vfsp->vfc_typenum; 2323 ovfs.vfc_refcount = vfsp->vfc_refcount; 2324 ovfs.vfc_flags = vfsp->vfc_flags; 2325 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); 2326 if (error) 2327 return error; 2328 } 2329 return 0; 2330 } 2331 2332 #endif /* 1 || COMPAT_PRELITE2 */ 2333 2334 #if 0 2335 #define KINFO_VNODESLOP 10 2336 /* 2337 * Dump vnode list (via sysctl). 2338 * Copyout address of vnode followed by vnode. 2339 */ 2340 /* ARGSUSED */ 2341 static int 2342 sysctl_vnode(SYSCTL_HANDLER_ARGS) 2343 { 2344 struct proc *p = curproc; /* XXX */ 2345 struct mount *mp, *nmp; 2346 struct vnode *nvp, *vp; 2347 int error; 2348 2349 #define VPTRSZ sizeof (struct vnode *) 2350 #define VNODESZ sizeof (struct vnode) 2351 2352 req->lock = 0; 2353 if (!req->oldptr) /* Make an estimate */ 2354 return (SYSCTL_OUT(req, 0, 2355 (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); 2356 2357 lwkt_gettoken(&mountlist_token); 2358 for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { 2359 if (vfs_busy(mp, LK_NOWAIT, &mountlist_token, p)) { 2360 nmp = TAILQ_NEXT(mp, mnt_list); 2361 continue; 2362 } 2363 again: 2364 lwkt_gettoken(&mntvnode_token); 2365 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); 2366 vp != NULL; 2367 vp = nvp) { 2368 /* 2369 * Check that the vp is still associated with 2370 * this filesystem. RACE: could have been 2371 * recycled onto the same filesystem. 2372 */ 2373 if (vp->v_mount != mp) { 2374 lwkt_reltoken(&mntvnode_token); 2375 goto again; 2376 } 2377 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 2378 lwkt_reltoken(&mntvnode_token); 2379 if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || 2380 (error = SYSCTL_OUT(req, vp, VNODESZ))) 2381 return (error); 2382 lwkt_gettoken(&mntvnode_token); 2383 } 2384 lwkt_reltoken(&mntvnode_token); 2385 lwkt_gettoken(&mountlist_token); 2386 nmp = TAILQ_NEXT(mp, mnt_list); 2387 vfs_unbusy(mp, p); 2388 } 2389 lwkt_reltoken(&mountlist_token); 2390 2391 return (0); 2392 } 2393 #endif 2394 2395 /* 2396 * XXX 2397 * Exporting the vnode list on large systems causes them to crash. 2398 * Exporting the vnode list on medium systems causes sysctl to coredump. 2399 */ 2400 #if 0 2401 SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, 2402 0, 0, sysctl_vnode, "S,vnode", ""); 2403 #endif 2404 2405 /* 2406 * Check to see if a filesystem is mounted on a block device. 2407 */ 2408 int 2409 vfs_mountedon(vp) 2410 struct vnode *vp; 2411 { 2412 2413 if (vp->v_specmountpoint != NULL) 2414 return (EBUSY); 2415 return (0); 2416 } 2417 2418 /* 2419 * Unmount all filesystems. The list is traversed in reverse order 2420 * of mounting to avoid dependencies. 2421 */ 2422 void 2423 vfs_unmountall() 2424 { 2425 struct mount *mp; 2426 struct thread *td = curthread; 2427 int error; 2428 2429 if (td->td_proc == NULL) 2430 td = initproc->p_thread; /* XXX XXX use proc0 instead? */ 2431 2432 /* 2433 * Since this only runs when rebooting, it is not interlocked. 2434 */ 2435 while(!TAILQ_EMPTY(&mountlist)) { 2436 mp = TAILQ_LAST(&mountlist, mntlist); 2437 error = dounmount(mp, MNT_FORCE, td); 2438 if (error) { 2439 TAILQ_REMOVE(&mountlist, mp, mnt_list); 2440 printf("unmount of %s failed (", 2441 mp->mnt_stat.f_mntonname); 2442 if (error == EBUSY) 2443 printf("BUSY)\n"); 2444 else 2445 printf("%d)\n", error); 2446 } else { 2447 /* The unmount has removed mp from the mountlist */ 2448 } 2449 } 2450 } 2451 2452 /* 2453 * Build hash lists of net addresses and hang them off the mount point. 2454 * Called by ufs_mount() to set up the lists of export addresses. 2455 */ 2456 static int 2457 vfs_hang_addrlist(mp, nep, argp) 2458 struct mount *mp; 2459 struct netexport *nep; 2460 struct export_args *argp; 2461 { 2462 struct netcred *np; 2463 struct radix_node_head *rnh; 2464 int i; 2465 struct radix_node *rn; 2466 struct sockaddr *saddr, *smask = 0; 2467 struct domain *dom; 2468 int error; 2469 2470 if (argp->ex_addrlen == 0) { 2471 if (mp->mnt_flag & MNT_DEFEXPORTED) 2472 return (EPERM); 2473 np = &nep->ne_defexported; 2474 np->netc_exflags = argp->ex_flags; 2475 np->netc_anon = argp->ex_anon; 2476 np->netc_anon.cr_ref = 1; 2477 mp->mnt_flag |= MNT_DEFEXPORTED; 2478 return (0); 2479 } 2480 2481 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN) 2482 return (EINVAL); 2483 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN) 2484 return (EINVAL); 2485 2486 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; 2487 np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); 2488 bzero((caddr_t) np, i); 2489 saddr = (struct sockaddr *) (np + 1); 2490 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) 2491 goto out; 2492 if (saddr->sa_len > argp->ex_addrlen) 2493 saddr->sa_len = argp->ex_addrlen; 2494 if (argp->ex_masklen) { 2495 smask = (struct sockaddr *) ((caddr_t) saddr + argp->ex_addrlen); 2496 error = copyin(argp->ex_mask, (caddr_t) smask, argp->ex_masklen); 2497 if (error) 2498 goto out; 2499 if (smask->sa_len > argp->ex_masklen) 2500 smask->sa_len = argp->ex_masklen; 2501 } 2502 i = saddr->sa_family; 2503 if ((rnh = nep->ne_rtable[i]) == 0) { 2504 /* 2505 * Seems silly to initialize every AF when most are not used, 2506 * do so on demand here 2507 */ 2508 for (dom = domains; dom; dom = dom->dom_next) 2509 if (dom->dom_family == i && dom->dom_rtattach) { 2510 dom->dom_rtattach((void **) &nep->ne_rtable[i], 2511 dom->dom_rtoffset); 2512 break; 2513 } 2514 if ((rnh = nep->ne_rtable[i]) == 0) { 2515 error = ENOBUFS; 2516 goto out; 2517 } 2518 } 2519 rn = (*rnh->rnh_addaddr) ((caddr_t) saddr, (caddr_t) smask, rnh, 2520 np->netc_rnodes); 2521 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ 2522 error = EPERM; 2523 goto out; 2524 } 2525 np->netc_exflags = argp->ex_flags; 2526 np->netc_anon = argp->ex_anon; 2527 np->netc_anon.cr_ref = 1; 2528 return (0); 2529 out: 2530 free(np, M_NETADDR); 2531 return (error); 2532 } 2533 2534 /* ARGSUSED */ 2535 static int 2536 vfs_free_netcred(rn, w) 2537 struct radix_node *rn; 2538 void *w; 2539 { 2540 struct radix_node_head *rnh = (struct radix_node_head *) w; 2541 2542 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); 2543 free((caddr_t) rn, M_NETADDR); 2544 return (0); 2545 } 2546 2547 /* 2548 * Free the net address hash lists that are hanging off the mount points. 2549 */ 2550 static void 2551 vfs_free_addrlist(nep) 2552 struct netexport *nep; 2553 { 2554 int i; 2555 struct radix_node_head *rnh; 2556 2557 for (i = 0; i <= AF_MAX; i++) 2558 if ((rnh = nep->ne_rtable[i])) { 2559 (*rnh->rnh_walktree) (rnh, vfs_free_netcred, 2560 (caddr_t) rnh); 2561 free((caddr_t) rnh, M_RTABLE); 2562 nep->ne_rtable[i] = 0; 2563 } 2564 } 2565 2566 int 2567 vfs_export(mp, nep, argp) 2568 struct mount *mp; 2569 struct netexport *nep; 2570 struct export_args *argp; 2571 { 2572 int error; 2573 2574 if (argp->ex_flags & MNT_DELEXPORT) { 2575 if (mp->mnt_flag & MNT_EXPUBLIC) { 2576 vfs_setpublicfs(NULL, NULL, NULL); 2577 mp->mnt_flag &= ~MNT_EXPUBLIC; 2578 } 2579 vfs_free_addrlist(nep); 2580 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); 2581 } 2582 if (argp->ex_flags & MNT_EXPORTED) { 2583 if (argp->ex_flags & MNT_EXPUBLIC) { 2584 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) 2585 return (error); 2586 mp->mnt_flag |= MNT_EXPUBLIC; 2587 } 2588 if ((error = vfs_hang_addrlist(mp, nep, argp))) 2589 return (error); 2590 mp->mnt_flag |= MNT_EXPORTED; 2591 } 2592 return (0); 2593 } 2594 2595 2596 /* 2597 * Set the publicly exported filesystem (WebNFS). Currently, only 2598 * one public filesystem is possible in the spec (RFC 2054 and 2055) 2599 */ 2600 int 2601 vfs_setpublicfs(mp, nep, argp) 2602 struct mount *mp; 2603 struct netexport *nep; 2604 struct export_args *argp; 2605 { 2606 int error; 2607 struct vnode *rvp; 2608 char *cp; 2609 2610 /* 2611 * mp == NULL -> invalidate the current info, the FS is 2612 * no longer exported. May be called from either vfs_export 2613 * or unmount, so check if it hasn't already been done. 2614 */ 2615 if (mp == NULL) { 2616 if (nfs_pub.np_valid) { 2617 nfs_pub.np_valid = 0; 2618 if (nfs_pub.np_index != NULL) { 2619 FREE(nfs_pub.np_index, M_TEMP); 2620 nfs_pub.np_index = NULL; 2621 } 2622 } 2623 return (0); 2624 } 2625 2626 /* 2627 * Only one allowed at a time. 2628 */ 2629 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) 2630 return (EBUSY); 2631 2632 /* 2633 * Get real filehandle for root of exported FS. 2634 */ 2635 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); 2636 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; 2637 2638 if ((error = VFS_ROOT(mp, &rvp))) 2639 return (error); 2640 2641 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) 2642 return (error); 2643 2644 vput(rvp); 2645 2646 /* 2647 * If an indexfile was specified, pull it in. 2648 */ 2649 if (argp->ex_indexfile != NULL) { 2650 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, 2651 M_WAITOK); 2652 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, 2653 MAXNAMLEN, (size_t *)0); 2654 if (!error) { 2655 /* 2656 * Check for illegal filenames. 2657 */ 2658 for (cp = nfs_pub.np_index; *cp; cp++) { 2659 if (*cp == '/') { 2660 error = EINVAL; 2661 break; 2662 } 2663 } 2664 } 2665 if (error) { 2666 FREE(nfs_pub.np_index, M_TEMP); 2667 return (error); 2668 } 2669 } 2670 2671 nfs_pub.np_mount = mp; 2672 nfs_pub.np_valid = 1; 2673 return (0); 2674 } 2675 2676 struct netcred * 2677 vfs_export_lookup(mp, nep, nam) 2678 struct mount *mp; 2679 struct netexport *nep; 2680 struct sockaddr *nam; 2681 { 2682 struct netcred *np; 2683 struct radix_node_head *rnh; 2684 struct sockaddr *saddr; 2685 2686 np = NULL; 2687 if (mp->mnt_flag & MNT_EXPORTED) { 2688 /* 2689 * Lookup in the export list first. 2690 */ 2691 if (nam != NULL) { 2692 saddr = nam; 2693 rnh = nep->ne_rtable[saddr->sa_family]; 2694 if (rnh != NULL) { 2695 np = (struct netcred *) 2696 (*rnh->rnh_matchaddr)((caddr_t)saddr, 2697 rnh); 2698 if (np && np->netc_rnodes->rn_flags & RNF_ROOT) 2699 np = NULL; 2700 } 2701 } 2702 /* 2703 * If no address match, use the default if it exists. 2704 */ 2705 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) 2706 np = &nep->ne_defexported; 2707 } 2708 return (np); 2709 } 2710 2711 /* 2712 * perform msync on all vnodes under a mount point 2713 * the mount point must be locked. 2714 */ 2715 void 2716 vfs_msync(struct mount *mp, int flags) 2717 { 2718 struct thread *td = curthread; /* XXX */ 2719 struct vnode *vp, *nvp; 2720 struct vm_object *obj; 2721 int tries; 2722 2723 tries = 5; 2724 lwkt_gettoken(&mntvnode_token); 2725 loop: 2726 for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); vp != NULL; vp = nvp) { 2727 if (vp->v_mount != mp) { 2728 if (--tries > 0) 2729 goto loop; 2730 break; 2731 } 2732 nvp = TAILQ_NEXT(vp, v_nmntvnodes); 2733 2734 if (vp->v_flag & VXLOCK) /* XXX: what if MNT_WAIT? */ 2735 continue; 2736 2737 /* 2738 * There could be hundreds of thousands of vnodes, we cannot 2739 * afford to do anything heavy-weight until we have a fairly 2740 * good indication that there is something to do. 2741 */ 2742 if ((vp->v_flag & VOBJDIRTY) && 2743 (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { 2744 lwkt_reltoken(&mntvnode_token); 2745 if (!vget(vp, 2746 LK_EXCLUSIVE | LK_RETRY | LK_NOOBJ, td)) { 2747 if (VOP_GETVOBJECT(vp, &obj) == 0) { 2748 vm_object_page_clean(obj, 0, 0, flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC); 2749 } 2750 vput(vp); 2751 } 2752 lwkt_gettoken(&mntvnode_token); 2753 if (TAILQ_NEXT(vp, v_nmntvnodes) != nvp) { 2754 if (--tries > 0) 2755 goto loop; 2756 break; 2757 } 2758 } 2759 } 2760 lwkt_reltoken(&mntvnode_token); 2761 } 2762 2763 /* 2764 * Create the VM object needed for VMIO and mmap support. This 2765 * is done for all VREG files in the system. Some filesystems might 2766 * afford the additional metadata buffering capability of the 2767 * VMIO code by making the device node be VMIO mode also. 2768 * 2769 * vp must be locked when vfs_object_create is called. 2770 */ 2771 int 2772 vfs_object_create(struct vnode *vp, struct thread *td) 2773 { 2774 return (VOP_CREATEVOBJECT(vp, td)); 2775 } 2776 2777 void 2778 vfree(vp) 2779 struct vnode *vp; 2780 { 2781 int s; 2782 2783 s = splbio(); 2784 lwkt_gettoken(&vnode_free_list_token); 2785 KASSERT((vp->v_flag & VFREE) == 0, ("vnode already free")); 2786 if (vp->v_flag & VAGE) { 2787 TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); 2788 } else { 2789 TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); 2790 } 2791 freevnodes++; 2792 lwkt_reltoken(&vnode_free_list_token); 2793 vp->v_flag &= ~VAGE; 2794 vp->v_flag |= VFREE; 2795 splx(s); 2796 } 2797 2798 void 2799 vbusy(vp) 2800 struct vnode *vp; 2801 { 2802 int s; 2803 2804 s = splbio(); 2805 lwkt_gettoken(&vnode_free_list_token); 2806 KASSERT((vp->v_flag & VFREE) != 0, ("vnode not free")); 2807 TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); 2808 freevnodes--; 2809 lwkt_reltoken(&vnode_free_list_token); 2810 vp->v_flag &= ~(VFREE|VAGE); 2811 splx(s); 2812 } 2813 2814 /* 2815 * Record a process's interest in events which might happen to 2816 * a vnode. Because poll uses the historic select-style interface 2817 * internally, this routine serves as both the ``check for any 2818 * pending events'' and the ``record my interest in future events'' 2819 * functions. (These are done together, while the lock is held, 2820 * to avoid race conditions.) 2821 */ 2822 int 2823 vn_pollrecord(struct vnode *vp, struct thread *td, int events) 2824 { 2825 lwkt_gettoken(&vp->v_pollinfo.vpi_token); 2826 if (vp->v_pollinfo.vpi_revents & events) { 2827 /* 2828 * This leaves events we are not interested 2829 * in available for the other process which 2830 * which presumably had requested them 2831 * (otherwise they would never have been 2832 * recorded). 2833 */ 2834 events &= vp->v_pollinfo.vpi_revents; 2835 vp->v_pollinfo.vpi_revents &= ~events; 2836 2837 lwkt_reltoken(&vp->v_pollinfo.vpi_token); 2838 return events; 2839 } 2840 vp->v_pollinfo.vpi_events |= events; 2841 selrecord(td, &vp->v_pollinfo.vpi_selinfo); 2842 lwkt_reltoken(&vp->v_pollinfo.vpi_token); 2843 return 0; 2844 } 2845 2846 /* 2847 * Note the occurrence of an event. If the VN_POLLEVENT macro is used, 2848 * it is possible for us to miss an event due to race conditions, but 2849 * that condition is expected to be rare, so for the moment it is the 2850 * preferred interface. 2851 */ 2852 void 2853 vn_pollevent(vp, events) 2854 struct vnode *vp; 2855 short events; 2856 { 2857 lwkt_gettoken(&vp->v_pollinfo.vpi_token); 2858 if (vp->v_pollinfo.vpi_events & events) { 2859 /* 2860 * We clear vpi_events so that we don't 2861 * call selwakeup() twice if two events are 2862 * posted before the polling process(es) is 2863 * awakened. This also ensures that we take at 2864 * most one selwakeup() if the polling process 2865 * is no longer interested. However, it does 2866 * mean that only one event can be noticed at 2867 * a time. (Perhaps we should only clear those 2868 * event bits which we note?) XXX 2869 */ 2870 vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */ 2871 vp->v_pollinfo.vpi_revents |= events; 2872 selwakeup(&vp->v_pollinfo.vpi_selinfo); 2873 } 2874 lwkt_reltoken(&vp->v_pollinfo.vpi_token); 2875 } 2876 2877 /* 2878 * Wake up anyone polling on vp because it is being revoked. 2879 * This depends on dead_poll() returning POLLHUP for correct 2880 * behavior. 2881 */ 2882 void 2883 vn_pollgone(vp) 2884 struct vnode *vp; 2885 { 2886 lwkt_gettoken(&vp->v_pollinfo.vpi_token); 2887 if (vp->v_pollinfo.vpi_events) { 2888 vp->v_pollinfo.vpi_events = 0; 2889 selwakeup(&vp->v_pollinfo.vpi_selinfo); 2890 } 2891 lwkt_reltoken(&vp->v_pollinfo.vpi_token); 2892 } 2893 2894 2895 2896 /* 2897 * Routine to create and manage a filesystem syncer vnode. 2898 */ 2899 #define sync_close ((int (*) (struct vop_close_args *))nullop) 2900 static int sync_fsync (struct vop_fsync_args *); 2901 static int sync_inactive (struct vop_inactive_args *); 2902 static int sync_reclaim (struct vop_reclaim_args *); 2903 #define sync_lock ((int (*) (struct vop_lock_args *))vop_nolock) 2904 #define sync_unlock ((int (*) (struct vop_unlock_args *))vop_nounlock) 2905 static int sync_print (struct vop_print_args *); 2906 #define sync_islocked ((int(*) (struct vop_islocked_args *))vop_noislocked) 2907 2908 static vop_t **sync_vnodeop_p; 2909 static struct vnodeopv_entry_desc sync_vnodeop_entries[] = { 2910 { &vop_default_desc, (vop_t *) vop_eopnotsupp }, 2911 { &vop_close_desc, (vop_t *) sync_close }, /* close */ 2912 { &vop_fsync_desc, (vop_t *) sync_fsync }, /* fsync */ 2913 { &vop_inactive_desc, (vop_t *) sync_inactive }, /* inactive */ 2914 { &vop_reclaim_desc, (vop_t *) sync_reclaim }, /* reclaim */ 2915 { &vop_lock_desc, (vop_t *) sync_lock }, /* lock */ 2916 { &vop_unlock_desc, (vop_t *) sync_unlock }, /* unlock */ 2917 { &vop_print_desc, (vop_t *) sync_print }, /* print */ 2918 { &vop_islocked_desc, (vop_t *) sync_islocked }, /* islocked */ 2919 { NULL, NULL } 2920 }; 2921 static struct vnodeopv_desc sync_vnodeop_opv_desc = 2922 { &sync_vnodeop_p, sync_vnodeop_entries }; 2923 2924 VNODEOP_SET(sync_vnodeop_opv_desc); 2925 2926 /* 2927 * Create a new filesystem syncer vnode for the specified mount point. 2928 */ 2929 int 2930 vfs_allocate_syncvnode(mp) 2931 struct mount *mp; 2932 { 2933 struct vnode *vp; 2934 static long start, incr, next; 2935 int error; 2936 2937 /* Allocate a new vnode */ 2938 if ((error = getnewvnode(VT_VFS, mp, sync_vnodeop_p, &vp)) != 0) { 2939 mp->mnt_syncer = NULL; 2940 return (error); 2941 } 2942 vp->v_type = VNON; 2943 /* 2944 * Place the vnode onto the syncer worklist. We attempt to 2945 * scatter them about on the list so that they will go off 2946 * at evenly distributed times even if all the filesystems 2947 * are mounted at once. 2948 */ 2949 next += incr; 2950 if (next == 0 || next > syncer_maxdelay) { 2951 start /= 2; 2952 incr /= 2; 2953 if (start == 0) { 2954 start = syncer_maxdelay / 2; 2955 incr = syncer_maxdelay; 2956 } 2957 next = start; 2958 } 2959 vn_syncer_add_to_worklist(vp, syncdelay > 0 ? next % syncdelay : 0); 2960 mp->mnt_syncer = vp; 2961 return (0); 2962 } 2963 2964 /* 2965 * Do a lazy sync of the filesystem. 2966 */ 2967 static int 2968 sync_fsync(ap) 2969 struct vop_fsync_args /* { 2970 struct vnode *a_vp; 2971 struct ucred *a_cred; 2972 int a_waitfor; 2973 struct thread *a_td; 2974 } */ *ap; 2975 { 2976 struct vnode *syncvp = ap->a_vp; 2977 struct mount *mp = syncvp->v_mount; 2978 struct thread *td = ap->a_td; 2979 int asyncflag; 2980 2981 /* 2982 * We only need to do something if this is a lazy evaluation. 2983 */ 2984 if (ap->a_waitfor != MNT_LAZY) 2985 return (0); 2986 2987 /* 2988 * Move ourselves to the back of the sync list. 2989 */ 2990 vn_syncer_add_to_worklist(syncvp, syncdelay); 2991 2992 /* 2993 * Walk the list of vnodes pushing all that are dirty and 2994 * not already on the sync list. 2995 */ 2996 lwkt_gettoken(&mountlist_token); 2997 if (vfs_busy(mp, LK_EXCLUSIVE | LK_NOWAIT, &mountlist_token, td) != 0) { 2998 lwkt_reltoken(&mountlist_token); 2999 return (0); 3000 } 3001 asyncflag = mp->mnt_flag & MNT_ASYNC; 3002 mp->mnt_flag &= ~MNT_ASYNC; 3003 vfs_msync(mp, MNT_NOWAIT); 3004 VFS_SYNC(mp, MNT_LAZY, td); 3005 if (asyncflag) 3006 mp->mnt_flag |= MNT_ASYNC; 3007 vfs_unbusy(mp, td); 3008 return (0); 3009 } 3010 3011 /* 3012 * The syncer vnode is no referenced. 3013 */ 3014 static int 3015 sync_inactive(ap) 3016 struct vop_inactive_args /* { 3017 struct vnode *a_vp; 3018 struct proc *a_p; 3019 } */ *ap; 3020 { 3021 3022 vgone(ap->a_vp); 3023 return (0); 3024 } 3025 3026 /* 3027 * The syncer vnode is no longer needed and is being decommissioned. 3028 * 3029 * Modifications to the worklist must be protected at splbio(). 3030 */ 3031 static int 3032 sync_reclaim(ap) 3033 struct vop_reclaim_args /* { 3034 struct vnode *a_vp; 3035 } */ *ap; 3036 { 3037 struct vnode *vp = ap->a_vp; 3038 int s; 3039 3040 s = splbio(); 3041 vp->v_mount->mnt_syncer = NULL; 3042 if (vp->v_flag & VONWORKLST) { 3043 LIST_REMOVE(vp, v_synclist); 3044 vp->v_flag &= ~VONWORKLST; 3045 } 3046 splx(s); 3047 3048 return (0); 3049 } 3050 3051 /* 3052 * Print out a syncer vnode. 3053 */ 3054 static int 3055 sync_print(ap) 3056 struct vop_print_args /* { 3057 struct vnode *a_vp; 3058 } */ *ap; 3059 { 3060 struct vnode *vp = ap->a_vp; 3061 3062 printf("syncer vnode"); 3063 if (vp->v_vnlock != NULL) 3064 lockmgr_printinfo(vp->v_vnlock); 3065 printf("\n"); 3066 return (0); 3067 } 3068 3069 /* 3070 * extract the dev_t from a VBLK or VCHR 3071 */ 3072 dev_t 3073 vn_todev(vp) 3074 struct vnode *vp; 3075 { 3076 if (vp->v_type != VBLK && vp->v_type != VCHR) 3077 return (NODEV); 3078 return (vp->v_rdev); 3079 } 3080 3081 /* 3082 * Check if vnode represents a disk device 3083 */ 3084 int 3085 vn_isdisk(vp, errp) 3086 struct vnode *vp; 3087 int *errp; 3088 { 3089 if (vp->v_type != VBLK && vp->v_type != VCHR) { 3090 if (errp != NULL) 3091 *errp = ENOTBLK; 3092 return (0); 3093 } 3094 if (vp->v_rdev == NULL) { 3095 if (errp != NULL) 3096 *errp = ENXIO; 3097 return (0); 3098 } 3099 if (!dev_dport(vp->v_rdev)) { 3100 if (errp != NULL) 3101 *errp = ENXIO; 3102 return (0); 3103 } 3104 if (!(dev_dflags(vp->v_rdev) & D_DISK)) { 3105 if (errp != NULL) 3106 *errp = ENOTBLK; 3107 return (0); 3108 } 3109 if (errp != NULL) 3110 *errp = 0; 3111 return (1); 3112 } 3113 3114 void 3115 NDFREE(ndp, flags) 3116 struct nameidata *ndp; 3117 const uint flags; 3118 { 3119 if (!(flags & NDF_NO_FREE_PNBUF) && 3120 (ndp->ni_cnd.cn_flags & CNP_HASBUF)) { 3121 zfree(namei_zone, ndp->ni_cnd.cn_pnbuf); 3122 ndp->ni_cnd.cn_flags &= ~CNP_HASBUF; 3123 } 3124 if (!(flags & NDF_NO_DNCP_RELE) && 3125 (ndp->ni_cnd.cn_flags & CNP_WANTDNCP) && 3126 ndp->ni_dncp) { 3127 cache_drop(ndp->ni_dncp); 3128 ndp->ni_dncp = NULL; 3129 } 3130 if (!(flags & NDF_NO_NCP_RELE) && 3131 (ndp->ni_cnd.cn_flags & CNP_WANTNCP) && 3132 ndp->ni_ncp) { 3133 cache_drop(ndp->ni_ncp); 3134 ndp->ni_ncp = NULL; 3135 } 3136 if (!(flags & NDF_NO_DVP_UNLOCK) && 3137 (ndp->ni_cnd.cn_flags & CNP_LOCKPARENT) && 3138 ndp->ni_dvp != ndp->ni_vp) { 3139 VOP_UNLOCK(ndp->ni_dvp, 0, ndp->ni_cnd.cn_td); 3140 } 3141 if (!(flags & NDF_NO_DVP_RELE) && 3142 (ndp->ni_cnd.cn_flags & (CNP_LOCKPARENT|CNP_WANTPARENT))) { 3143 vrele(ndp->ni_dvp); 3144 ndp->ni_dvp = NULL; 3145 } 3146 if (!(flags & NDF_NO_VP_UNLOCK) && 3147 (ndp->ni_cnd.cn_flags & CNP_LOCKLEAF) && ndp->ni_vp) { 3148 VOP_UNLOCK(ndp->ni_vp, 0, ndp->ni_cnd.cn_td); 3149 } 3150 if (!(flags & NDF_NO_VP_RELE) && 3151 ndp->ni_vp) { 3152 vrele(ndp->ni_vp); 3153 ndp->ni_vp = NULL; 3154 } 3155 if (!(flags & NDF_NO_STARTDIR_RELE) && 3156 (ndp->ni_cnd.cn_flags & CNP_SAVESTART)) { 3157 vrele(ndp->ni_startdir); 3158 ndp->ni_startdir = NULL; 3159 } 3160 } 3161 3162