| 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 1.50 2004/12/17 00:18:07 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/reboot.h> |
| 63 | #include <sys/socket.h> |
| 64 | #include <sys/stat.h> |
| 65 | #include <sys/sysctl.h> |
| 66 | #include <sys/syslog.h> |
| 67 | #include <sys/vmmeter.h> |
| 68 | #include <sys/vnode.h> |
| 69 | |
| 70 | #include <machine/limits.h> |
| 71 | |
| 72 | #include <vm/vm.h> |
| 73 | #include <vm/vm_object.h> |
| 74 | #include <vm/vm_extern.h> |
| 75 | #include <vm/vm_kern.h> |
| 76 | #include <vm/pmap.h> |
| 77 | #include <vm/vm_map.h> |
| 78 | #include <vm/vm_page.h> |
| 79 | #include <vm/vm_pager.h> |
| 80 | #include <vm/vnode_pager.h> |
| 81 | #include <vm/vm_zone.h> |
| 82 | |
| 83 | #include <sys/buf2.h> |
| 84 | #include <sys/thread2.h> |
| 85 | |
| 86 | static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure"); |
| 87 | |
| 88 | int numvnodes; |
| 89 | SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, ""); |
| 90 | int vfs_fastdev = 1; |
| 91 | SYSCTL_INT(_vfs, OID_AUTO, fastdev, CTLFLAG_RW, &vfs_fastdev, 0, ""); |
| 92 | |
| 93 | enum vtype iftovt_tab[16] = { |
| 94 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, |
| 95 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, |
| 96 | }; |
| 97 | int vttoif_tab[9] = { |
| 98 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, |
| 99 | S_IFSOCK, S_IFIFO, S_IFMT, |
| 100 | }; |
| 101 | |
| 102 | static int reassignbufcalls; |
| 103 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW, |
| 104 | &reassignbufcalls, 0, ""); |
| 105 | static int reassignbufloops; |
| 106 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW, |
| 107 | &reassignbufloops, 0, ""); |
| 108 | static int reassignbufsortgood; |
| 109 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW, |
| 110 | &reassignbufsortgood, 0, ""); |
| 111 | static int reassignbufsortbad; |
| 112 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW, |
| 113 | &reassignbufsortbad, 0, ""); |
| 114 | static int reassignbufmethod = 1; |
| 115 | SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW, |
| 116 | &reassignbufmethod, 0, ""); |
| 117 | |
| 118 | int nfs_mount_type = -1; |
| 119 | static struct lwkt_token spechash_token; |
| 120 | struct nfs_public nfs_pub; /* publicly exported FS */ |
| 121 | |
| 122 | int desiredvnodes; |
| 123 | SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW, |
| 124 | &desiredvnodes, 0, "Maximum number of vnodes"); |
| 125 | |
| 126 | static void vfs_free_addrlist (struct netexport *nep); |
| 127 | static int vfs_free_netcred (struct radix_node *rn, void *w); |
| 128 | static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep, |
| 129 | struct export_args *argp); |
| 130 | |
| 131 | extern int dev_ref_debug; |
| 132 | extern struct vnodeopv_entry_desc spec_vnodeop_entries[]; |
| 133 | |
| 134 | /* |
| 135 | * Return 0 if the vnode is already on the free list or cannot be placed |
| 136 | * on the free list. Return 1 if the vnode can be placed on the free list. |
| 137 | */ |
| 138 | static __inline int |
| 139 | vshouldfree(struct vnode *vp, int usecount) |
| 140 | { |
| 141 | if (vp->v_flag & VFREE) |
| 142 | return (0); /* already free */ |
| 143 | if (vp->v_holdcnt != 0 || vp->v_usecount != usecount) |
| 144 | return (0); /* other holderse */ |
| 145 | if (vp->v_object && |
| 146 | (vp->v_object->ref_count || vp->v_object->resident_page_count)) { |
| 147 | return (0); |
| 148 | } |
| 149 | return (1); |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Initialize the vnode management data structures. |
| 154 | * |
| 155 | * Called from vfsinit() |
| 156 | */ |
| 157 | void |
| 158 | vfs_subr_init(void) |
| 159 | { |
| 160 | /* |
| 161 | * Desired vnodes is a result of the physical page count |
| 162 | * and the size of kernel's heap. It scales in proportion |
| 163 | * to the amount of available physical memory. This can |
| 164 | * cause trouble on 64-bit and large memory platforms. |
| 165 | */ |
| 166 | /* desiredvnodes = maxproc + vmstats.v_page_count / 4; */ |
| 167 | desiredvnodes = |
| 168 | min(maxproc + vmstats.v_page_count /4, |
| 169 | 2 * (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / |
| 170 | (5 * (sizeof(struct vm_object) + sizeof(struct vnode)))); |
| 171 | |
| 172 | lwkt_token_init(&spechash_token); |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * Knob to control the precision of file timestamps: |
| 177 | * |
| 178 | * 0 = seconds only; nanoseconds zeroed. |
| 179 | * 1 = seconds and nanoseconds, accurate within 1/HZ. |
| 180 | * 2 = seconds and nanoseconds, truncated to microseconds. |
| 181 | * >=3 = seconds and nanoseconds, maximum precision. |
| 182 | */ |
| 183 | enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC }; |
| 184 | |
| 185 | static int timestamp_precision = TSP_SEC; |
| 186 | SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW, |
| 187 | ×tamp_precision, 0, ""); |
| 188 | |
| 189 | /* |
| 190 | * Get a current timestamp. |
| 191 | */ |
| 192 | void |
| 193 | vfs_timestamp(struct timespec *tsp) |
| 194 | { |
| 195 | struct timeval tv; |
| 196 | |
| 197 | switch (timestamp_precision) { |
| 198 | case TSP_SEC: |
| 199 | tsp->tv_sec = time_second; |
| 200 | tsp->tv_nsec = 0; |
| 201 | break; |
| 202 | case TSP_HZ: |
| 203 | getnanotime(tsp); |
| 204 | break; |
| 205 | case TSP_USEC: |
| 206 | microtime(&tv); |
| 207 | TIMEVAL_TO_TIMESPEC(&tv, tsp); |
| 208 | break; |
| 209 | case TSP_NSEC: |
| 210 | default: |
| 211 | nanotime(tsp); |
| 212 | break; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Set vnode attributes to VNOVAL |
| 218 | */ |
| 219 | void |
| 220 | vattr_null(struct vattr *vap) |
| 221 | { |
| 222 | vap->va_type = VNON; |
| 223 | vap->va_size = VNOVAL; |
| 224 | vap->va_bytes = VNOVAL; |
| 225 | vap->va_mode = VNOVAL; |
| 226 | vap->va_nlink = VNOVAL; |
| 227 | vap->va_uid = VNOVAL; |
| 228 | vap->va_gid = VNOVAL; |
| 229 | vap->va_fsid = VNOVAL; |
| 230 | vap->va_fileid = VNOVAL; |
| 231 | vap->va_blocksize = VNOVAL; |
| 232 | vap->va_rdev = VNOVAL; |
| 233 | vap->va_atime.tv_sec = VNOVAL; |
| 234 | vap->va_atime.tv_nsec = VNOVAL; |
| 235 | vap->va_mtime.tv_sec = VNOVAL; |
| 236 | vap->va_mtime.tv_nsec = VNOVAL; |
| 237 | vap->va_ctime.tv_sec = VNOVAL; |
| 238 | vap->va_ctime.tv_nsec = VNOVAL; |
| 239 | vap->va_flags = VNOVAL; |
| 240 | vap->va_gen = VNOVAL; |
| 241 | vap->va_vaflags = 0; |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Update outstanding I/O count and do wakeup if requested. |
| 246 | */ |
| 247 | void |
| 248 | vwakeup(struct buf *bp) |
| 249 | { |
| 250 | struct vnode *vp; |
| 251 | |
| 252 | bp->b_flags &= ~B_WRITEINPROG; |
| 253 | if ((vp = bp->b_vp)) { |
| 254 | vp->v_numoutput--; |
| 255 | if (vp->v_numoutput < 0) |
| 256 | panic("vwakeup: neg numoutput"); |
| 257 | if ((vp->v_numoutput == 0) && (vp->v_flag & VBWAIT)) { |
| 258 | vp->v_flag &= ~VBWAIT; |
| 259 | wakeup((caddr_t) &vp->v_numoutput); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Flush out and invalidate all buffers associated with a vnode. |
| 266 | * |
| 267 | * vp must be locked. |
| 268 | */ |
| 269 | int |
| 270 | vinvalbuf(struct vnode *vp, int flags, struct thread *td, |
| 271 | int slpflag, int slptimeo) |
| 272 | { |
| 273 | struct buf *bp; |
| 274 | struct buf *nbp, *blist; |
| 275 | int s, error; |
| 276 | vm_object_t object; |
| 277 | |
| 278 | if (flags & V_SAVE) { |
| 279 | s = splbio(); |
| 280 | while (vp->v_numoutput) { |
| 281 | vp->v_flag |= VBWAIT; |
| 282 | error = tsleep((caddr_t)&vp->v_numoutput, |
| 283 | slpflag, "vinvlbuf", slptimeo); |
| 284 | if (error) { |
| 285 | splx(s); |
| 286 | return (error); |
| 287 | } |
| 288 | } |
| 289 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 290 | splx(s); |
| 291 | if ((error = VOP_FSYNC(vp, MNT_WAIT, td)) != 0) |
| 292 | return (error); |
| 293 | s = splbio(); |
| 294 | if (vp->v_numoutput > 0 || |
| 295 | !TAILQ_EMPTY(&vp->v_dirtyblkhd)) |
| 296 | panic("vinvalbuf: dirty bufs"); |
| 297 | } |
| 298 | splx(s); |
| 299 | } |
| 300 | s = splbio(); |
| 301 | for (;;) { |
| 302 | blist = TAILQ_FIRST(&vp->v_cleanblkhd); |
| 303 | if (!blist) |
| 304 | blist = TAILQ_FIRST(&vp->v_dirtyblkhd); |
| 305 | if (!blist) |
| 306 | break; |
| 307 | |
| 308 | for (bp = blist; bp; bp = nbp) { |
| 309 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 310 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 311 | error = BUF_TIMELOCK(bp, |
| 312 | LK_EXCLUSIVE | LK_SLEEPFAIL, |
| 313 | "vinvalbuf", slpflag, slptimeo); |
| 314 | if (error == ENOLCK) |
| 315 | break; |
| 316 | splx(s); |
| 317 | return (error); |
| 318 | } |
| 319 | /* |
| 320 | * XXX Since there are no node locks for NFS, I |
| 321 | * believe there is a slight chance that a delayed |
| 322 | * write will occur while sleeping just above, so |
| 323 | * check for it. Note that vfs_bio_awrite expects |
| 324 | * buffers to reside on a queue, while VOP_BWRITE and |
| 325 | * brelse do not. |
| 326 | */ |
| 327 | if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) && |
| 328 | (flags & V_SAVE)) { |
| 329 | |
| 330 | if (bp->b_vp == vp) { |
| 331 | if (bp->b_flags & B_CLUSTEROK) { |
| 332 | BUF_UNLOCK(bp); |
| 333 | vfs_bio_awrite(bp); |
| 334 | } else { |
| 335 | bremfree(bp); |
| 336 | bp->b_flags |= B_ASYNC; |
| 337 | VOP_BWRITE(bp->b_vp, bp); |
| 338 | } |
| 339 | } else { |
| 340 | bremfree(bp); |
| 341 | (void) VOP_BWRITE(bp->b_vp, bp); |
| 342 | } |
| 343 | break; |
| 344 | } |
| 345 | bremfree(bp); |
| 346 | bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF); |
| 347 | bp->b_flags &= ~B_ASYNC; |
| 348 | brelse(bp); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Wait for I/O to complete. XXX needs cleaning up. The vnode can |
| 354 | * have write I/O in-progress but if there is a VM object then the |
| 355 | * VM object can also have read-I/O in-progress. |
| 356 | */ |
| 357 | do { |
| 358 | while (vp->v_numoutput > 0) { |
| 359 | vp->v_flag |= VBWAIT; |
| 360 | tsleep(&vp->v_numoutput, 0, "vnvlbv", 0); |
| 361 | } |
| 362 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 363 | while (object->paging_in_progress) |
| 364 | vm_object_pip_sleep(object, "vnvlbx"); |
| 365 | } |
| 366 | } while (vp->v_numoutput > 0); |
| 367 | |
| 368 | splx(s); |
| 369 | |
| 370 | /* |
| 371 | * Destroy the copy in the VM cache, too. |
| 372 | */ |
| 373 | if (VOP_GETVOBJECT(vp, &object) == 0) { |
| 374 | vm_object_page_remove(object, 0, 0, |
| 375 | (flags & V_SAVE) ? TRUE : FALSE); |
| 376 | } |
| 377 | |
| 378 | if (!TAILQ_EMPTY(&vp->v_dirtyblkhd) || !TAILQ_EMPTY(&vp->v_cleanblkhd)) |
| 379 | panic("vinvalbuf: flush failed"); |
| 380 | return (0); |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Truncate a file's buffer and pages to a specified length. This |
| 385 | * is in lieu of the old vinvalbuf mechanism, which performed unneeded |
| 386 | * sync activity. |
| 387 | * |
| 388 | * The vnode must be locked. |
| 389 | */ |
| 390 | int |
| 391 | vtruncbuf(struct vnode *vp, struct thread *td, off_t length, int blksize) |
| 392 | { |
| 393 | struct buf *bp; |
| 394 | struct buf *nbp; |
| 395 | int s, anyfreed; |
| 396 | int trunclbn; |
| 397 | |
| 398 | /* |
| 399 | * Round up to the *next* lbn. |
| 400 | */ |
| 401 | trunclbn = (length + blksize - 1) / blksize; |
| 402 | |
| 403 | s = splbio(); |
| 404 | restart: |
| 405 | anyfreed = 1; |
| 406 | for (;anyfreed;) { |
| 407 | anyfreed = 0; |
| 408 | for (bp = TAILQ_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) { |
| 409 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 410 | if (bp->b_lblkno >= trunclbn) { |
| 411 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 412 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 413 | goto restart; |
| 414 | } else { |
| 415 | bremfree(bp); |
| 416 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 417 | bp->b_flags &= ~B_ASYNC; |
| 418 | brelse(bp); |
| 419 | anyfreed = 1; |
| 420 | } |
| 421 | if (nbp && |
| 422 | (((nbp->b_xflags & BX_VNCLEAN) == 0) || |
| 423 | (nbp->b_vp != vp) || |
| 424 | (nbp->b_flags & B_DELWRI))) { |
| 425 | goto restart; |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 431 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 432 | if (bp->b_lblkno >= trunclbn) { |
| 433 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 434 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 435 | goto restart; |
| 436 | } else { |
| 437 | bremfree(bp); |
| 438 | bp->b_flags |= (B_INVAL | B_RELBUF); |
| 439 | bp->b_flags &= ~B_ASYNC; |
| 440 | brelse(bp); |
| 441 | anyfreed = 1; |
| 442 | } |
| 443 | if (nbp && |
| 444 | (((nbp->b_xflags & BX_VNDIRTY) == 0) || |
| 445 | (nbp->b_vp != vp) || |
| 446 | (nbp->b_flags & B_DELWRI) == 0)) { |
| 447 | goto restart; |
| 448 | } |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | if (length > 0) { |
| 454 | restartsync: |
| 455 | for (bp = TAILQ_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { |
| 456 | nbp = TAILQ_NEXT(bp, b_vnbufs); |
| 457 | if ((bp->b_flags & B_DELWRI) && (bp->b_lblkno < 0)) { |
| 458 | if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) { |
| 459 | BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL); |
| 460 | goto restart; |
| 461 | } else { |
| 462 | bremfree(bp); |
| 463 | if (bp->b_vp == vp) { |
| 464 | bp->b_flags |= B_ASYNC; |
| 465 | } else { |
| 466 | bp->b_flags &= ~B_ASYNC; |
| 467 | } |
| 468 | VOP_BWRITE(bp->b_vp, bp); |
| 469 | } |
| 470 | goto restartsync; |
| 471 | } |
| 472 | |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | while (vp->v_numoutput > 0) { |
| 477 | vp->v_flag |= VBWAIT; |
| 478 | tsleep(&vp->v_numoutput, 0, "vbtrunc", 0); |
| 479 | } |
| 480 | |
| 481 | splx(s); |
| 482 | |
| 483 | vnode_pager_setsize(vp, length); |
| 484 | |
| 485 | return (0); |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Associate a buffer with a vnode. |
| 490 | */ |
| 491 | void |
| 492 | bgetvp(struct vnode *vp, struct buf *bp) |
| 493 | { |
| 494 | KASSERT(bp->b_vp == NULL, ("bgetvp: not free")); |
| 495 | |
| 496 | vhold(vp); |
| 497 | bp->b_vp = vp; |
| 498 | bp->b_dev = vn_todev(vp); |
| 499 | /* |
| 500 | * Insert onto list for new vnode. |
| 501 | */ |
| 502 | crit_enter(); |
| 503 | bp->b_xflags |= BX_VNCLEAN; |
| 504 | bp->b_xflags &= ~BX_VNDIRTY; |
| 505 | TAILQ_INSERT_TAIL(&vp->v_cleanblkhd, bp, b_vnbufs); |
| 506 | crit_exit(); |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Disassociate a buffer from a vnode. |
| 511 | */ |
| 512 | void |
| 513 | brelvp(struct buf *bp) |
| 514 | { |
| 515 | struct vnode *vp; |
| 516 | struct buflists *listheadp; |
| 517 | |
| 518 | KASSERT(bp->b_vp != NULL, ("brelvp: NULL")); |
| 519 | |
| 520 | /* |
| 521 | * Delete from old vnode list, if on one. |
| 522 | */ |
| 523 | vp = bp->b_vp; |
| 524 | crit_enter(); |
| 525 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 526 | if (bp->b_xflags & BX_VNDIRTY) |
| 527 | listheadp = &vp->v_dirtyblkhd; |
| 528 | else |
| 529 | listheadp = &vp->v_cleanblkhd; |
| 530 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 531 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 532 | } |
| 533 | if ((vp->v_flag & VONWORKLST) && TAILQ_EMPTY(&vp->v_dirtyblkhd)) { |
| 534 | vp->v_flag &= ~VONWORKLST; |
| 535 | LIST_REMOVE(vp, v_synclist); |
| 536 | } |
| 537 | crit_exit(); |
| 538 | bp->b_vp = NULL; |
| 539 | vdrop(vp); |
| 540 | } |
| 541 | |
| 542 | /* |
| 543 | * Associate a p-buffer with a vnode. |
| 544 | * |
| 545 | * Also sets B_PAGING flag to indicate that vnode is not fully associated |
| 546 | * with the buffer. i.e. the bp has not been linked into the vnode or |
| 547 | * ref-counted. |
| 548 | */ |
| 549 | void |
| 550 | pbgetvp(struct vnode *vp, struct buf *bp) |
| 551 | { |
| 552 | KASSERT(bp->b_vp == NULL, ("pbgetvp: not free")); |
| 553 | |
| 554 | bp->b_vp = vp; |
| 555 | bp->b_flags |= B_PAGING; |
| 556 | bp->b_dev = vn_todev(vp); |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * Disassociate a p-buffer from a vnode. |
| 561 | */ |
| 562 | void |
| 563 | pbrelvp(struct buf *bp) |
| 564 | { |
| 565 | KASSERT(bp->b_vp != NULL, ("pbrelvp: NULL")); |
| 566 | |
| 567 | /* XXX REMOVE ME */ |
| 568 | if (TAILQ_NEXT(bp, b_vnbufs) != NULL) { |
| 569 | panic( |
| 570 | "relpbuf(): b_vp was probably reassignbuf()d %p %x", |
| 571 | bp, |
| 572 | (int)bp->b_flags |
| 573 | ); |
| 574 | } |
| 575 | bp->b_vp = (struct vnode *) 0; |
| 576 | bp->b_flags &= ~B_PAGING; |
| 577 | } |
| 578 | |
| 579 | void |
| 580 | pbreassignbuf(struct buf *bp, struct vnode *newvp) |
| 581 | { |
| 582 | if ((bp->b_flags & B_PAGING) == 0) { |
| 583 | panic( |
| 584 | "pbreassignbuf() on non phys bp %p", |
| 585 | bp |
| 586 | ); |
| 587 | } |
| 588 | bp->b_vp = newvp; |
| 589 | } |
| 590 | |
| 591 | /* |
| 592 | * Reassign a buffer from one vnode to another. |
| 593 | * Used to assign file specific control information |
| 594 | * (indirect blocks) to the vnode to which they belong. |
| 595 | */ |
| 596 | void |
| 597 | reassignbuf(struct buf *bp, struct vnode *newvp) |
| 598 | { |
| 599 | struct buflists *listheadp; |
| 600 | int delay; |
| 601 | |
| 602 | if (newvp == NULL) { |
| 603 | printf("reassignbuf: NULL"); |
| 604 | return; |
| 605 | } |
| 606 | ++reassignbufcalls; |
| 607 | |
| 608 | /* |
| 609 | * B_PAGING flagged buffers cannot be reassigned because their vp |
| 610 | * is not fully linked in. |
| 611 | */ |
| 612 | if (bp->b_flags & B_PAGING) |
| 613 | panic("cannot reassign paging buffer"); |
| 614 | |
| 615 | crit_enter(); |
| 616 | /* |
| 617 | * Delete from old vnode list, if on one. |
| 618 | */ |
| 619 | if (bp->b_xflags & (BX_VNDIRTY | BX_VNCLEAN)) { |
| 620 | if (bp->b_xflags & BX_VNDIRTY) |
| 621 | listheadp = &bp->b_vp->v_dirtyblkhd; |
| 622 | else |
| 623 | listheadp = &bp->b_vp->v_cleanblkhd; |
| 624 | TAILQ_REMOVE(listheadp, bp, b_vnbufs); |
| 625 | bp->b_xflags &= ~(BX_VNDIRTY | BX_VNCLEAN); |
| 626 | if (bp->b_vp != newvp) { |
| 627 | vdrop(bp->b_vp); |
| 628 | bp->b_vp = NULL; /* for clarification */ |
| 629 | } |
| 630 | } |
| 631 | /* |
| 632 | * If dirty, put on list of dirty buffers; otherwise insert onto list |
| 633 | * of clean buffers. |
| 634 | */ |
| 635 | if (bp->b_flags & B_DELWRI) { |
| 636 | struct buf *tbp; |
| 637 | |
| 638 | listheadp = &newvp->v_dirtyblkhd; |
| 639 | if ((newvp->v_flag & VONWORKLST) == 0) { |
| 640 | switch (newvp->v_type) { |
| 641 | case VDIR: |
| 642 | delay = dirdelay; |
| 643 | break; |
| 644 | case VCHR: |
| 645 | case VBLK: |
| 646 | if (newvp->v_rdev && |
| 647 | newvp->v_rdev->si_mountpoint != NULL) { |
| 648 | delay = metadelay; |
| 649 | break; |
| 650 | } |
| 651 | /* fall through */ |
| 652 | default: |
| 653 | delay = filedelay; |
| 654 | } |
| 655 | vn_syncer_add_to_worklist(newvp, delay); |
| 656 | } |
| 657 | bp->b_xflags |= BX_VNDIRTY; |
| 658 | tbp = TAILQ_FIRST(listheadp); |
| 659 | if (tbp == NULL || |
| 660 | bp->b_lblkno == 0 || |
| 661 | (bp->b_lblkno > 0 && tbp->b_lblkno < 0) || |
| 662 | (bp->b_lblkno > 0 && bp->b_lblkno < tbp->b_lblkno)) { |
| 663 | TAILQ_INSERT_HEAD(listheadp, bp, b_vnbufs); |
| 664 | ++reassignbufsortgood; |
| 665 | } else if (bp->b_lblkno < 0) { |
| 666 | TAILQ_INSERT_TAIL(listheadp, bp, b_vnbufs); |
| 667 | ++reassignbufsortgood; |
| 668 | } else if (reassignbufmethod == 1) { |
| 669 | /* |
| 670 | * New sorting algorithm, only handle sequential case, |
| 671 | * otherwise append to end (but before metadata) |
| 672 | */ |
| 673 | if ((tbp = gbincore(newvp, bp->b_lblkno - 1)) != NULL && |
| 674 | (tbp->b_xflags & BX_VNDIRTY)) { |
| 675 | /* |
| 676 | * Found the best place to insert the buffer |
| 677 | */ |
| 678 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 679 | ++reassignbufsortgood; |
| 680 | } else { |
| 681 | /* |
| 682 | * Missed, append to end, but before meta-data. |
| 683 | * We know that the head buffer in the list is |
| 684 | * not meta-data due to prior conditionals. |
| 685 | * |
| 686 | * Indirect effects: NFS second stage write |
| 687 | * tends to wind up here, giving maximum |
| 688 | * distance between the unstable write and the |
| 689 | * commit rpc. |
| 690 | */ |
| 691 | tbp = TAILQ_LAST(listheadp, buflists); |
| 692 | while (tbp && tbp->b_lblkno < 0) |
| 693 | tbp = TAILQ_PREV(tbp, buflists, b_vnbufs); |
| 694 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 695 | ++reassignbufsortbad; |
| 696 | } |
| 697 | } else { |
| 698 | /* |
| 699 | * Old sorting algorithm, scan queue and insert |
| 700 | */ |
| 701 | struct buf *ttbp; |
| 702 | while ((ttbp = TAILQ_NEXT(tbp, b_vnbufs)) && |
| 703 | (ttbp->b_lblkno < bp->b_lblkno)) { |
| 704 | ++reassignbufloops; |
| 705 | tbp = ttbp; |
| 706 | } |
| 707 | TAILQ_INSERT_AFTER(listheadp, tbp, bp, b_vnbufs); |
| 708 | } |
| 709 | } else { |
| 710 | bp->b_xflags |= BX_VNCLEAN; |
| 711 | TAILQ_INSERT_TAIL(&newvp->v_cleanblkhd, bp, b_vnbufs); |
| 712 | if ((newvp->v_flag & VONWORKLST) && |
| 713 | TAILQ_EMPTY(&newvp->v_dirtyblkhd)) { |
| 714 | newvp->v_flag &= ~VONWORKLST; |
| 715 | LIST_REMOVE(newvp, v_synclist); |
| 716 | } |
| 717 | } |
| 718 | if (bp->b_vp != newvp) { |
| 719 | bp->b_vp = newvp; |
| 720 | vhold(bp->b_vp); |
| 721 | } |
| 722 | crit_exit(); |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Create a vnode for a block device. |
| 727 | * Used for mounting the root file system. |
| 728 | */ |
| 729 | int |
| 730 | bdevvp(dev_t dev, struct vnode **vpp) |
| 731 | { |
| 732 | struct vnode *vp; |
| 733 | struct vnode *nvp; |
| 734 | int error; |
| 735 | |
| 736 | if (dev == NODEV) { |
| 737 | *vpp = NULLVP; |
| 738 | return (ENXIO); |
| 739 | } |
| 740 | error = getspecialvnode(VT_NON, NULL, &spec_vnode_vops, &nvp, 0, 0); |
| 741 | if (error) { |
| 742 | *vpp = NULLVP; |
| 743 | return (error); |
| 744 | } |
| 745 | vp = nvp; |
| 746 | vp->v_type = VCHR; |
| 747 | vp->v_udev = dev->si_udev; |
| 748 | vx_unlock(vp); |
| 749 | *vpp = vp; |
| 750 | return (0); |
| 751 | } |
| 752 | |
| 753 | int |
| 754 | v_associate_rdev(struct vnode *vp, dev_t dev) |
| 755 | { |
| 756 | lwkt_tokref ilock; |
| 757 | |
| 758 | if (dev == NULL || dev == NODEV) |
| 759 | return(ENXIO); |
| 760 | if (dev_is_good(dev) == 0) |
| 761 | return(ENXIO); |
| 762 | KKASSERT(vp->v_rdev == NULL); |
| 763 | if (dev_ref_debug) |
| 764 | printf("Z1"); |
| 765 | vp->v_rdev = reference_dev(dev); |
| 766 | lwkt_gettoken(&ilock, &spechash_token); |
| 767 | SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_specnext); |
| 768 | lwkt_reltoken(&ilock); |
| 769 | return(0); |
| 770 | } |
| 771 | |
| 772 | void |
| 773 | v_release_rdev(struct vnode *vp) |
| 774 | { |
| 775 | lwkt_tokref ilock; |
| 776 | dev_t dev; |
| 777 | |
| 778 | if ((dev = vp->v_rdev) != NULL) { |
| 779 | lwkt_gettoken(&ilock, &spechash_token); |
| 780 | SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_specnext); |
| 781 | if (dev_ref_debug && vp->v_opencount != 0) { |
| 782 | printf("releasing rdev with non-0 " |
| 783 | "v_opencount(%d) (revoked?)\n", |
| 784 | vp->v_opencount); |
| 785 | } |
| 786 | vp->v_rdev = NULL; |
| 787 | vp->v_opencount = 0; |
| 788 | release_dev(dev); |
| 789 | lwkt_reltoken(&ilock); |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * Add a vnode to the alias list hung off the dev_t. We only associate |
| 795 | * the device number with the vnode. The actual device is not associated |
| 796 | * until the vnode is opened (usually in spec_open()), and will be |
| 797 | * disassociated on last close. |
| 798 | */ |
| 799 | void |
| 800 | addaliasu(struct vnode *nvp, udev_t nvp_udev) |
| 801 | { |
| 802 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) |
| 803 | panic("addaliasu on non-special vnode"); |
| 804 | nvp->v_udev = nvp_udev; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Disassociate a vnode from its underlying filesystem. |
| 809 | * |
| 810 | * The vnode must be VX locked and refd |
| 811 | * |
| 812 | * If there are v_usecount references to the vnode other then ours we have |
| 813 | * to VOP_CLOSE the vnode before we can deactivate and reclaim it. |
| 814 | */ |
| 815 | void |
| 816 | vclean(struct vnode *vp, int flags, struct thread *td) |
| 817 | { |
| 818 | int active; |
| 819 | |
| 820 | /* |
| 821 | * If the vnode has already been reclaimed we have nothing to do. |
| 822 | */ |
| 823 | if (vp->v_flag & VRECLAIMED) |
| 824 | return; |
| 825 | vp->v_flag |= VRECLAIMED; |
| 826 | |
| 827 | /* |
| 828 | * Scrap the vfs cache |
| 829 | */ |
| 830 | cache_inval_vp(vp, 0); |
| 831 | |
| 832 | /* |
| 833 | * Check to see if the vnode is in use. If so we have to reference it |
| 834 | * before we clean it out so that its count cannot fall to zero and |
| 835 | * generate a race against ourselves to recycle it. |
| 836 | */ |
| 837 | active = (vp->v_usecount > 1); |
| 838 | |
| 839 | /* |
| 840 | * Clean out any buffers associated with the vnode and destroy its |
| 841 | * object, if it has one. |
| 842 | */ |
| 843 | vinvalbuf(vp, V_SAVE, td, 0, 0); |
| 844 | VOP_DESTROYVOBJECT(vp); |
| 845 | |
| 846 | /* |
| 847 | * If purging an active vnode, it must be closed and |
| 848 | * deactivated before being reclaimed. XXX |
| 849 | * |
| 850 | * Note that neither of these routines unlocks the vnode. |
| 851 | */ |
| 852 | if (active) { |
| 853 | if (flags & DOCLOSE) |
| 854 | VOP_CLOSE(vp, FNONBLOCK, td); |
| 855 | } |
| 856 | |
| 857 | /* |
| 858 | * If the vnode has not be deactivated, deactivated it. |
| 859 | */ |
| 860 | if ((vp->v_flag & VINACTIVE) == 0) { |
| 861 | vp->v_flag |= VINACTIVE; |
| 862 | VOP_INACTIVE(vp, td); |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * Reclaim the vnode. |
| 867 | */ |
| 868 | if (VOP_RECLAIM(vp, td)) |
| 869 | panic("vclean: cannot reclaim"); |
| 870 | |
| 871 | /* |
| 872 | * Done with purge, notify sleepers of the grim news. |
| 873 | */ |
| 874 | vp->v_ops = &dead_vnode_vops; |
| 875 | vn_pollgone(vp); |
| 876 | vp->v_tag = VT_NON; |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * Eliminate all activity associated with the requested vnode |
| 881 | * and with all vnodes aliased to the requested vnode. |
| 882 | * |
| 883 | * The vnode must be referenced and vx_lock()'d |
| 884 | * |
| 885 | * revoke { struct vnode *a_vp, int a_flags } |
| 886 | */ |
| 887 | int |
| 888 | vop_stdrevoke(struct vop_revoke_args *ap) |
| 889 | { |
| 890 | struct vnode *vp, *vq; |
| 891 | lwkt_tokref ilock; |
| 892 | dev_t dev; |
| 893 | |
| 894 | KASSERT((ap->a_flags & REVOKEALL) != 0, ("vop_revoke")); |
| 895 | |
| 896 | vp = ap->a_vp; |
| 897 | |
| 898 | /* |
| 899 | * If the vnode is already dead don't try to revoke it |
| 900 | */ |
| 901 | if (vp->v_flag & VRECLAIMED) |
| 902 | return (0); |
| 903 | |
| 904 | /* |
| 905 | * If the vnode has a device association, scrap all vnodes associated |
| 906 | * with the device. Don't let the device disappear on us while we |
| 907 | * are scrapping the vnodes. |
| 908 | * |
| 909 | * The passed vp will probably show up in the list, do not VX lock |
| 910 | * it twice! |
| 911 | */ |
| 912 | if (vp->v_type != VCHR && vp->v_type != VBLK) |
| 913 | return(0); |
| 914 | if ((dev = vp->v_rdev) == NULL) { |
| 915 | if ((dev = udev2dev(vp->v_udev, vp->v_type == VBLK)) == NODEV) |
| 916 | return(0); |
| 917 | } |
| 918 | reference_dev(dev); |
| 919 | lwkt_gettoken(&ilock, &spechash_token); |
| 920 | while ((vq = SLIST_FIRST(&dev->si_hlist)) != NULL) { |
| 921 | if (vp == vq || vx_get(vq) == 0) { |
| 922 | if (vq == SLIST_FIRST(&dev->si_hlist)) |
| 923 | vgone(vq); |
| 924 | if (vp != vq) |
| 925 | vx_put(vq); |
| 926 | } |
| 927 | } |
| 928 | lwkt_reltoken(&ilock); |
| 929 | release_dev(dev); |
| 930 | return (0); |
| 931 | } |
| 932 | |
| 933 | /* |
| 934 | * Recycle an unused vnode to the front of the free list. |
| 935 | * |
| 936 | * Returns 1 if we were successfully able to recycle the vnode, |
| 937 | * 0 otherwise. |
| 938 | */ |
| 939 | int |
| 940 | vrecycle(struct vnode *vp, struct thread *td) |
| 941 | { |
| 942 | if (vp->v_usecount == 1) { |
| 943 | vgone(vp); |
| 944 | return (1); |
| 945 | } |
| 946 | return (0); |
| 947 | } |
| 948 | |
| 949 | /* |
| 950 | * Eliminate all activity associated with a vnode in preparation for reuse. |
| 951 | * |
| 952 | * The vnode must be VX locked and refd and will remain VX locked and refd |
| 953 | * on return. This routine may be called with the vnode in any state, as |
| 954 | * long as it is VX locked. The vnode will be cleaned out and marked |
| 955 | * VRECLAIMED but will not actually be reused until all existing refs and |
| 956 | * holds go away. |
| 957 | * |
| 958 | * NOTE: This routine may be called on a vnode which has not yet been |
| 959 | * already been deactivated (VOP_INACTIVE), or on a vnode which has |
| 960 | * already been reclaimed. |
| 961 | * |
| 962 | * This routine is not responsible for placing us back on the freelist. |
| 963 | * Instead, it happens automatically when the caller releases the VX lock |
| 964 | * (assuming there aren't any other references). |
| 965 | */ |
| 966 | void |
| 967 | vgone(struct vnode *vp) |
| 968 | { |
| 969 | /* |
| 970 | * assert that the VX lock is held. This is an absolute requirement |
| 971 | * now for vgone() to be called. |
| 972 | */ |
| 973 | KKASSERT(vp->v_lock.lk_exclusivecount == 1); |
| 974 | |
| 975 | /* |
| 976 | * Clean out the filesystem specific data and set the VRECLAIMED |
| 977 | * bit. Also deactivate the vnode if necessary. |
| 978 | */ |
| 979 | vclean(vp, DOCLOSE, curthread); |
| 980 | |
| 981 | /* |
| 982 | * Delete from old mount point vnode list, if on one. |
| 983 | */ |
| 984 | if (vp->v_mount != NULL) |
| 985 | insmntque(vp, NULL); |
| 986 | |
| 987 | /* |
| 988 | * If special device, remove it from special device alias list |
| 989 | * if it is on one. This should normally only occur if a vnode is |
| 990 | * being revoked as the device should otherwise have been released |
| 991 | * naturally. |
| 992 | */ |
| 993 | if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) { |
| 994 | v_release_rdev(vp); |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Set us to VBAD |
| 999 | */ |
| 1000 | vp->v_type = VBAD; |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Lookup a vnode by device number. |
| 1005 | */ |
| 1006 | int |
| 1007 | vfinddev(dev_t dev, enum vtype type, struct vnode **vpp) |
| 1008 | { |
| 1009 | lwkt_tokref ilock; |
| 1010 | struct vnode *vp; |
| 1011 | |
| 1012 | lwkt_gettoken(&ilock, &spechash_token); |
| 1013 | SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { |
| 1014 | if (type == vp->v_type) { |
| 1015 | *vpp = vp; |
| 1016 | lwkt_reltoken(&ilock); |
| 1017 | return (1); |
| 1018 | } |
| 1019 | } |
| 1020 | lwkt_reltoken(&ilock); |
| 1021 | return (0); |
| 1022 | } |
| 1023 | |
| 1024 | /* |
| 1025 | * Calculate the total number of references to a special device. This |
| 1026 | * routine may only be called for VBLK and VCHR vnodes since v_rdev is |
| 1027 | * an overloaded field. Since udev2dev can now return NODEV, we have |
| 1028 | * to check for a NULL v_rdev. |
| 1029 | */ |
| 1030 | int |
| 1031 | count_dev(dev_t dev) |
| 1032 | { |
| 1033 | lwkt_tokref ilock; |
| 1034 | struct vnode *vp; |
| 1035 | int count = 0; |
| 1036 | |
| 1037 | if (SLIST_FIRST(&dev->si_hlist)) { |
| 1038 | lwkt_gettoken(&ilock, &spechash_token); |
| 1039 | SLIST_FOREACH(vp, &dev->si_hlist, v_specnext) { |
| 1040 | count += vp->v_usecount; |
| 1041 | } |
| 1042 | lwkt_reltoken(&ilock); |
| 1043 | } |
| 1044 | return(count); |
| 1045 | } |
| 1046 | |
| 1047 | int |
| 1048 | count_udev(udev_t udev) |
| 1049 | { |
| 1050 | dev_t dev; |
| 1051 | |
| 1052 | if ((dev = udev2dev(udev, 0)) == NODEV) |
| 1053 | return(0); |
| 1054 | return(count_dev(dev)); |
| 1055 | } |
| 1056 | |
| 1057 | int |
| 1058 | vcount(struct vnode *vp) |
| 1059 | { |
| 1060 | if (vp->v_rdev == NULL) |
| 1061 | return(0); |
| 1062 | return(count_dev(vp->v_rdev)); |
| 1063 | } |
| 1064 | |
| 1065 | /* |
| 1066 | * Print out a description of a vnode. |
| 1067 | */ |
| 1068 | static char *typename[] = |
| 1069 | {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"}; |
| 1070 | |
| 1071 | void |
| 1072 | vprint(char *label, struct vnode *vp) |
| 1073 | { |
| 1074 | char buf[96]; |
| 1075 | |
| 1076 | if (label != NULL) |
| 1077 | printf("%s: %p: ", label, (void *)vp); |
| 1078 | else |
| 1079 | printf("%p: ", (void *)vp); |
| 1080 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
| 1081 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, |
| 1082 | vp->v_holdcnt); |
| 1083 | buf[0] = '\0'; |
| 1084 | if (vp->v_flag & VROOT) |
| 1085 | strcat(buf, "|VROOT"); |
| 1086 | if (vp->v_flag & VTEXT) |
| 1087 | strcat(buf, "|VTEXT"); |
| 1088 | if (vp->v_flag & VSYSTEM) |
| 1089 | strcat(buf, "|VSYSTEM"); |
| 1090 | if (vp->v_flag & VBWAIT) |
| 1091 | strcat(buf, "|VBWAIT"); |
| 1092 | if (vp->v_flag & VFREE) |
| 1093 | strcat(buf, "|VFREE"); |
| 1094 | if (vp->v_flag & VOBJBUF) |
| 1095 | strcat(buf, "|VOBJBUF"); |
| 1096 | if (buf[0] != '\0') |
| 1097 | printf(" flags (%s)", &buf[1]); |
| 1098 | if (vp->v_data == NULL) { |
| 1099 | printf("\n"); |
| 1100 | } else { |
| 1101 | printf("\n\t"); |
| 1102 | VOP_PRINT(vp); |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | #ifdef DDB |
| 1107 | #include <ddb/ddb.h> |
| 1108 | /* |
| 1109 | * List all of the locked vnodes in the system. |
| 1110 | * Called when debugging the kernel. |
| 1111 | */ |
| 1112 | DB_SHOW_COMMAND(lockedvnodes, lockedvnodes) |
| 1113 | { |
| 1114 | struct thread *td = curthread; /* XXX */ |
| 1115 | lwkt_tokref ilock; |
| 1116 | struct mount *mp, *nmp; |
| 1117 | struct vnode *vp; |
| 1118 | |
| 1119 | printf("Locked vnodes\n"); |
| 1120 | lwkt_gettoken(&ilock, &mountlist_token); |
| 1121 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 1122 | if (vfs_busy(mp, LK_NOWAIT, &ilock, td)) { |
| 1123 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 1124 | continue; |
| 1125 | } |
| 1126 | TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) { |
| 1127 | if (VOP_ISLOCKED(vp, NULL)) |
| 1128 | vprint((char *)0, vp); |
| 1129 | } |
| 1130 | lwkt_gettokref(&ilock); |
| 1131 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 1132 | vfs_unbusy(mp, td); |
| 1133 | } |
| 1134 | lwkt_reltoken(&ilock); |
| 1135 | } |
| 1136 | #endif |
| 1137 | |
| 1138 | /* |
| 1139 | * Top level filesystem related information gathering. |
| 1140 | */ |
| 1141 | static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS); |
| 1142 | |
| 1143 | static int |
| 1144 | vfs_sysctl(SYSCTL_HANDLER_ARGS) |
| 1145 | { |
| 1146 | int *name = (int *)arg1 - 1; /* XXX */ |
| 1147 | u_int namelen = arg2 + 1; /* XXX */ |
| 1148 | struct vfsconf *vfsp; |
| 1149 | |
| 1150 | #if 1 || defined(COMPAT_PRELITE2) |
| 1151 | /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */ |
| 1152 | if (namelen == 1) |
| 1153 | return (sysctl_ovfs_conf(oidp, arg1, arg2, req)); |
| 1154 | #endif |
| 1155 | |
| 1156 | #ifdef notyet |
| 1157 | /* all sysctl names at this level are at least name and field */ |
| 1158 | if (namelen < 2) |
| 1159 | return (ENOTDIR); /* overloaded */ |
| 1160 | if (name[0] != VFS_GENERIC) { |
| 1161 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 1162 | if (vfsp->vfc_typenum == name[0]) |
| 1163 | break; |
| 1164 | if (vfsp == NULL) |
| 1165 | return (EOPNOTSUPP); |
| 1166 | return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1, |
| 1167 | oldp, oldlenp, newp, newlen, p)); |
| 1168 | } |
| 1169 | #endif |
| 1170 | switch (name[1]) { |
| 1171 | case VFS_MAXTYPENUM: |
| 1172 | if (namelen != 2) |
| 1173 | return (ENOTDIR); |
| 1174 | return (SYSCTL_OUT(req, &maxvfsconf, sizeof(int))); |
| 1175 | case VFS_CONF: |
| 1176 | if (namelen != 3) |
| 1177 | return (ENOTDIR); /* overloaded */ |
| 1178 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) |
| 1179 | if (vfsp->vfc_typenum == name[2]) |
| 1180 | break; |
| 1181 | if (vfsp == NULL) |
| 1182 | return (EOPNOTSUPP); |
| 1183 | return (SYSCTL_OUT(req, vfsp, sizeof *vfsp)); |
| 1184 | } |
| 1185 | return (EOPNOTSUPP); |
| 1186 | } |
| 1187 | |
| 1188 | SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl, |
| 1189 | "Generic filesystem"); |
| 1190 | |
| 1191 | #if 1 || defined(COMPAT_PRELITE2) |
| 1192 | |
| 1193 | static int |
| 1194 | sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS) |
| 1195 | { |
| 1196 | int error; |
| 1197 | struct vfsconf *vfsp; |
| 1198 | struct ovfsconf ovfs; |
| 1199 | |
| 1200 | for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) { |
| 1201 | ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */ |
| 1202 | strcpy(ovfs.vfc_name, vfsp->vfc_name); |
| 1203 | ovfs.vfc_index = vfsp->vfc_typenum; |
| 1204 | ovfs.vfc_refcount = vfsp->vfc_refcount; |
| 1205 | ovfs.vfc_flags = vfsp->vfc_flags; |
| 1206 | error = SYSCTL_OUT(req, &ovfs, sizeof ovfs); |
| 1207 | if (error) |
| 1208 | return error; |
| 1209 | } |
| 1210 | return 0; |
| 1211 | } |
| 1212 | |
| 1213 | #endif /* 1 || COMPAT_PRELITE2 */ |
| 1214 | |
| 1215 | #if 0 |
| 1216 | #define KINFO_VNODESLOP 10 |
| 1217 | /* |
| 1218 | * Dump vnode list (via sysctl). |
| 1219 | * Copyout address of vnode followed by vnode. |
| 1220 | */ |
| 1221 | /* ARGSUSED */ |
| 1222 | static int |
| 1223 | sysctl_vnode(SYSCTL_HANDLER_ARGS) |
| 1224 | { |
| 1225 | struct proc *p = curproc; /* XXX */ |
| 1226 | struct mount *mp, *nmp; |
| 1227 | struct vnode *nvp, *vp; |
| 1228 | lwkt_tokref ilock; |
| 1229 | lwkt_tokref jlock; |
| 1230 | int error; |
| 1231 | |
| 1232 | #define VPTRSZ sizeof (struct vnode *) |
| 1233 | #define VNODESZ sizeof (struct vnode) |
| 1234 | |
| 1235 | req->lock = 0; |
| 1236 | if (!req->oldptr) /* Make an estimate */ |
| 1237 | return (SYSCTL_OUT(req, 0, |
| 1238 | (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ))); |
| 1239 | |
| 1240 | lwkt_gettoken(&ilock, &mountlist_token); |
| 1241 | for (mp = TAILQ_FIRST(&mountlist); mp != NULL; mp = nmp) { |
| 1242 | if (vfs_busy(mp, LK_NOWAIT, &ilock, p)) { |
| 1243 | nmp = TAILQ_NEXT(mp, mnt_list); |
| 1244 | continue; |
| 1245 | } |
| 1246 | lwkt_gettoken(&jlock, &mntvnode_token); |
| 1247 | again: |
| 1248 | for (vp = TAILQ_FIRST(&mp->mnt_nvnodelist); |
| 1249 | vp != NULL; |
| 1250 | vp = nvp) { |
| 1251 | /* |
| 1252 | * Check that the vp is still associated with |
| 1253 | * this filesystem. RACE: could have been |
| 1254 | * recycled onto the same filesystem. |
| 1255 | */ |
| 1256 | if (vp->v_mount != mp) |
| 1257 | goto again; |
| 1258 | nvp = TAILQ_NEXT(vp, v_nmntvnodes); |
| 1259 | if ((error = SYSCTL_OUT(req, &vp, VPTRSZ)) || |
| 1260 | (error = SYSCTL_OUT(req, vp, VNODESZ))) { |
| 1261 | lwkt_reltoken(&jlock); |
| 1262 | return (error); |
| 1263 | } |
| 1264 | } |
| 1265 | lwkt_reltoken(&jlock); |
| 1266 | lwkt_gettokref(&ilock); |
| 1267 | nmp = TAILQ_NEXT(mp, mnt_list); /* ZZZ */ |
| 1268 | vfs_unbusy(mp, p); |
| 1269 | } |
| 1270 | lwkt_reltoken(&ilock); |
| 1271 | |
| 1272 | return (0); |
| 1273 | } |
| 1274 | #endif |
| 1275 | |
| 1276 | /* |
| 1277 | * XXX |
| 1278 | * Exporting the vnode list on large systems causes them to crash. |
| 1279 | * Exporting the vnode list on medium systems causes sysctl to coredump. |
| 1280 | */ |
| 1281 | #if 0 |
| 1282 | SYSCTL_PROC(_kern, KERN_VNODE, vnode, CTLTYPE_OPAQUE|CTLFLAG_RD, |
| 1283 | 0, 0, sysctl_vnode, "S,vnode", ""); |
| 1284 | #endif |
| 1285 | |
| 1286 | /* |
| 1287 | * Check to see if a filesystem is mounted on a block device. |
| 1288 | */ |
| 1289 | int |
| 1290 | vfs_mountedon(struct vnode *vp) |
| 1291 | { |
| 1292 | dev_t dev; |
| 1293 | |
| 1294 | if ((dev = vp->v_rdev) == NULL) |
| 1295 | dev = udev2dev(vp->v_udev, (vp->v_type == VBLK)); |
| 1296 | if (dev != NODEV && dev->si_mountpoint) |
| 1297 | return (EBUSY); |
| 1298 | return (0); |
| 1299 | } |
| 1300 | |
| 1301 | /* |
| 1302 | * Unmount all filesystems. The list is traversed in reverse order |
| 1303 | * of mounting to avoid dependencies. |
| 1304 | */ |
| 1305 | void |
| 1306 | vfs_unmountall(void) |
| 1307 | { |
| 1308 | struct mount *mp; |
| 1309 | struct thread *td = curthread; |
| 1310 | int error; |
| 1311 | |
| 1312 | if (td->td_proc == NULL) |
| 1313 | td = initproc->p_thread; /* XXX XXX use proc0 instead? */ |
| 1314 | |
| 1315 | /* |
| 1316 | * Since this only runs when rebooting, it is not interlocked. |
| 1317 | */ |
| 1318 | while(!TAILQ_EMPTY(&mountlist)) { |
| 1319 | mp = TAILQ_LAST(&mountlist, mntlist); |
| 1320 | error = dounmount(mp, MNT_FORCE, td); |
| 1321 | if (error) { |
| 1322 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 1323 | printf("unmount of %s failed (", |
| 1324 | mp->mnt_stat.f_mntonname); |
| 1325 | if (error == EBUSY) |
| 1326 | printf("BUSY)\n"); |
| 1327 | else |
| 1328 | printf("%d)\n", error); |
| 1329 | } else { |
| 1330 | /* The unmount has removed mp from the mountlist */ |
| 1331 | } |
| 1332 | } |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * Build hash lists of net addresses and hang them off the mount point. |
| 1337 | * Called by ufs_mount() to set up the lists of export addresses. |
| 1338 | */ |
| 1339 | static int |
| 1340 | vfs_hang_addrlist(struct mount *mp, struct netexport *nep, |
| 1341 | struct export_args *argp) |
| 1342 | { |
| 1343 | struct netcred *np; |
| 1344 | struct radix_node_head *rnh; |
| 1345 | int i; |
| 1346 | struct radix_node *rn; |
| 1347 | struct sockaddr *saddr, *smask = 0; |
| 1348 | struct domain *dom; |
| 1349 | int error; |
| 1350 | |
| 1351 | if (argp->ex_addrlen == 0) { |
| 1352 | if (mp->mnt_flag & MNT_DEFEXPORTED) |
| 1353 | return (EPERM); |
| 1354 | np = &nep->ne_defexported; |
| 1355 | np->netc_exflags = argp->ex_flags; |
| 1356 | np->netc_anon = argp->ex_anon; |
| 1357 | np->netc_anon.cr_ref = 1; |
| 1358 | mp->mnt_flag |= MNT_DEFEXPORTED; |
| 1359 | return (0); |
| 1360 | } |
| 1361 | |
| 1362 | if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN) |
| 1363 | return (EINVAL); |
| 1364 | if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN) |
| 1365 | return (EINVAL); |
| 1366 | |
| 1367 | i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; |
| 1368 | np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK); |
| 1369 | bzero((caddr_t) np, i); |
| 1370 | saddr = (struct sockaddr *) (np + 1); |
| 1371 | if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen))) |
| 1372 | goto out; |
| 1373 | if (saddr->sa_len > argp->ex_addrlen) |
| 1374 | saddr->sa_len = argp->ex_addrlen; |
| 1375 | if (argp->ex_masklen) { |
| 1376 | smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); |
| 1377 | error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen); |
| 1378 | if (error) |
| 1379 | goto out; |
| 1380 | if (smask->sa_len > argp->ex_masklen) |
| 1381 | smask->sa_len = argp->ex_masklen; |
| 1382 | } |
| 1383 | i = saddr->sa_family; |
| 1384 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 1385 | /* |
| 1386 | * Seems silly to initialize every AF when most are not used, |
| 1387 | * do so on demand here |
| 1388 | */ |
| 1389 | for (dom = domains; dom; dom = dom->dom_next) |
| 1390 | if (dom->dom_family == i && dom->dom_rtattach) { |
| 1391 | dom->dom_rtattach((void **) &nep->ne_rtable[i], |
| 1392 | dom->dom_rtoffset); |
| 1393 | break; |
| 1394 | } |
| 1395 | if ((rnh = nep->ne_rtable[i]) == 0) { |
| 1396 | error = ENOBUFS; |
| 1397 | goto out; |
| 1398 | } |
| 1399 | } |
| 1400 | rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh, |
| 1401 | np->netc_rnodes); |
| 1402 | if (rn == 0 || np != (struct netcred *) rn) { /* already exists */ |
| 1403 | error = EPERM; |
| 1404 | goto out; |
| 1405 | } |
| 1406 | np->netc_exflags = argp->ex_flags; |
| 1407 | np->netc_anon = argp->ex_anon; |
| 1408 | np->netc_anon.cr_ref = 1; |
| 1409 | return (0); |
| 1410 | out: |
| 1411 | free(np, M_NETADDR); |
| 1412 | return (error); |
| 1413 | } |
| 1414 | |
| 1415 | /* ARGSUSED */ |
| 1416 | static int |
| 1417 | vfs_free_netcred(struct radix_node *rn, void *w) |
| 1418 | { |
| 1419 | struct radix_node_head *rnh = (struct radix_node_head *) w; |
| 1420 | |
| 1421 | (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh); |
| 1422 | free((caddr_t) rn, M_NETADDR); |
| 1423 | return (0); |
| 1424 | } |
| 1425 | |
| 1426 | /* |
| 1427 | * Free the net address hash lists that are hanging off the mount points. |
| 1428 | */ |
| 1429 | static void |
| 1430 | vfs_free_addrlist(struct netexport *nep) |
| 1431 | { |
| 1432 | int i; |
| 1433 | struct radix_node_head *rnh; |
| 1434 | |
| 1435 | for (i = 0; i <= AF_MAX; i++) |
| 1436 | if ((rnh = nep->ne_rtable[i])) { |
| 1437 | (*rnh->rnh_walktree) (rnh, vfs_free_netcred, |
| 1438 | (caddr_t) rnh); |
| 1439 | free((caddr_t) rnh, M_RTABLE); |
| 1440 | nep->ne_rtable[i] = 0; |
| 1441 | } |
| 1442 | } |
| 1443 | |
| 1444 | int |
| 1445 | vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp) |
| 1446 | { |
| 1447 | int error; |
| 1448 | |
| 1449 | if (argp->ex_flags & MNT_DELEXPORT) { |
| 1450 | if (mp->mnt_flag & MNT_EXPUBLIC) { |
| 1451 | vfs_setpublicfs(NULL, NULL, NULL); |
| 1452 | mp->mnt_flag &= ~MNT_EXPUBLIC; |
| 1453 | } |
| 1454 | vfs_free_addrlist(nep); |
| 1455 | mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); |
| 1456 | } |
| 1457 | if (argp->ex_flags & MNT_EXPORTED) { |
| 1458 | if (argp->ex_flags & MNT_EXPUBLIC) { |
| 1459 | if ((error = vfs_setpublicfs(mp, nep, argp)) != 0) |
| 1460 | return (error); |
| 1461 | mp->mnt_flag |= MNT_EXPUBLIC; |
| 1462 | } |
| 1463 | if ((error = vfs_hang_addrlist(mp, nep, argp))) |
| 1464 | return (error); |
| 1465 | mp->mnt_flag |= MNT_EXPORTED; |
| 1466 | } |
| 1467 | return (0); |
| 1468 | } |
| 1469 | |
| 1470 | |
| 1471 | /* |
| 1472 | * Set the publicly exported filesystem (WebNFS). Currently, only |
| 1473 | * one public filesystem is possible in the spec (RFC 2054 and 2055) |
| 1474 | */ |
| 1475 | int |
| 1476 | vfs_setpublicfs(struct mount *mp, struct netexport *nep, |
| 1477 | struct export_args *argp) |
| 1478 | { |
| 1479 | int error; |
| 1480 | struct vnode *rvp; |
| 1481 | char *cp; |
| 1482 | |
| 1483 | /* |
| 1484 | * mp == NULL -> invalidate the current info, the FS is |
| 1485 | * no longer exported. May be called from either vfs_export |
| 1486 | * or unmount, so check if it hasn't already been done. |
| 1487 | */ |
| 1488 | if (mp == NULL) { |
| 1489 | if (nfs_pub.np_valid) { |
| 1490 | nfs_pub.np_valid = 0; |
| 1491 | if (nfs_pub.np_index != NULL) { |
| 1492 | FREE(nfs_pub.np_index, M_TEMP); |
| 1493 | nfs_pub.np_index = NULL; |
| 1494 | } |
| 1495 | } |
| 1496 | return (0); |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | * Only one allowed at a time. |
| 1501 | */ |
| 1502 | if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount) |
| 1503 | return (EBUSY); |
| 1504 | |
| 1505 | /* |
| 1506 | * Get real filehandle for root of exported FS. |
| 1507 | */ |
| 1508 | bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle)); |
| 1509 | nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid; |
| 1510 | |
| 1511 | if ((error = VFS_ROOT(mp, &rvp))) |
| 1512 | return (error); |
| 1513 | |
| 1514 | if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid))) |
| 1515 | return (error); |
| 1516 | |
| 1517 | vput(rvp); |
| 1518 | |
| 1519 | /* |
| 1520 | * If an indexfile was specified, pull it in. |
| 1521 | */ |
| 1522 | if (argp->ex_indexfile != NULL) { |
| 1523 | MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP, |
| 1524 | M_WAITOK); |
| 1525 | error = copyinstr(argp->ex_indexfile, nfs_pub.np_index, |
| 1526 | MAXNAMLEN, (size_t *)0); |
| 1527 | if (!error) { |
| 1528 | /* |
| 1529 | * Check for illegal filenames. |
| 1530 | */ |
| 1531 | for (cp = nfs_pub.np_index; *cp; cp++) { |
| 1532 | if (*cp == '/') { |
| 1533 | error = EINVAL; |
| 1534 | break; |
| 1535 | } |
| 1536 | } |
| 1537 | } |
| 1538 | if (error) { |
| 1539 | FREE(nfs_pub.np_index, M_TEMP); |
| 1540 | return (error); |
| 1541 | } |
| 1542 | } |
| 1543 | |
| 1544 | nfs_pub.np_mount = mp; |
| 1545 | nfs_pub.np_valid = 1; |
| 1546 | return (0); |
| 1547 | } |
| 1548 | |
| 1549 | struct netcred * |
| 1550 | vfs_export_lookup(struct mount *mp, struct netexport *nep, |
| 1551 | struct sockaddr *nam) |
| 1552 | { |
| 1553 | struct netcred *np; |
| 1554 | struct radix_node_head *rnh; |
| 1555 | struct sockaddr *saddr; |
| 1556 | |
| 1557 | np = NULL; |
| 1558 | if (mp->mnt_flag & MNT_EXPORTED) { |
| 1559 | /* |
| 1560 | * Lookup in the export list first. |
| 1561 | */ |
| 1562 | if (nam != NULL) { |
| 1563 | saddr = nam; |
| 1564 | rnh = nep->ne_rtable[saddr->sa_family]; |
| 1565 | if (rnh != NULL) { |
| 1566 | np = (struct netcred *) |
| 1567 | (*rnh->rnh_matchaddr)((char *)saddr, |
| 1568 | rnh); |
| 1569 | if (np && np->netc_rnodes->rn_flags & RNF_ROOT) |
| 1570 | np = NULL; |
| 1571 | } |
| 1572 | } |
| 1573 | /* |
| 1574 | * If no address match, use the default if it exists. |
| 1575 | */ |
| 1576 | if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) |
| 1577 | np = &nep->ne_defexported; |
| 1578 | } |
| 1579 | return (np); |
| 1580 | } |
| 1581 | |
| 1582 | /* |
| 1583 | * perform msync on all vnodes under a mount point. The mount point must |
| 1584 | * be locked. This code is also responsible for lazy-freeing unreferenced |
| 1585 | * vnodes whos VM objects no longer contain pages. |
| 1586 | * |
| 1587 | * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state. |
| 1588 | */ |
| 1589 | static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data); |
| 1590 | static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data); |
| 1591 | |
| 1592 | void |
| 1593 | vfs_msync(struct mount *mp, int flags) |
| 1594 | { |
| 1595 | vmntvnodescan(mp, VMSC_REFVP, vfs_msync_scan1, vfs_msync_scan2, |
| 1596 | (void *)flags); |
| 1597 | } |
| 1598 | |
| 1599 | /* |
| 1600 | * scan1 is a fast pre-check. There could be hundreds of thousands of |
| 1601 | * vnodes, we cannot afford to do anything heavy weight until we have a |
| 1602 | * fairly good indication that there is work to do. |
| 1603 | */ |
| 1604 | static |
| 1605 | int |
| 1606 | vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data) |
| 1607 | { |
| 1608 | int flags = (int)data; |
| 1609 | |
| 1610 | if ((vp->v_flag & VRECLAIMED) == 0) { |
| 1611 | if (vshouldfree(vp, 0)) |
| 1612 | return(0); /* call scan2 */ |
| 1613 | if ((mp->mnt_flag & MNT_RDONLY) == 0 && |
| 1614 | (vp->v_flag & VOBJDIRTY) && |
| 1615 | (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { |
| 1616 | return(0); /* call scan2 */ |
| 1617 | } |
| 1618 | } |
| 1619 | |
| 1620 | /* |
| 1621 | * do not call scan2, continue the loop |
| 1622 | */ |
| 1623 | return(-1); |
| 1624 | } |
| 1625 | |
| 1626 | static |
| 1627 | int |
| 1628 | vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data) |
| 1629 | { |
| 1630 | vm_object_t obj; |
| 1631 | int flags = (int)data; |
| 1632 | |
| 1633 | if (vp->v_flag & VRECLAIMED) |
| 1634 | return(0); |
| 1635 | |
| 1636 | if ((mp->mnt_flag & MNT_RDONLY) == 0 && |
| 1637 | (vp->v_flag & VOBJDIRTY) && |
| 1638 | (flags == MNT_WAIT || VOP_ISLOCKED(vp, NULL) == 0)) { |
| 1639 | if (VOP_GETVOBJECT(vp, &obj) == 0) { |
| 1640 | vm_object_page_clean(obj, 0, 0, |
| 1641 | flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC); |
| 1642 | } |
| 1643 | } |
| 1644 | return(0); |
| 1645 | } |
| 1646 | |
| 1647 | /* |
| 1648 | * Create the VM object needed for VMIO and mmap support. This |
| 1649 | * is done for all VREG files in the system. Some filesystems might |
| 1650 | * afford the additional metadata buffering capability of the |
| 1651 | * VMIO code by making the device node be VMIO mode also. |
| 1652 | * |
| 1653 | * vp must be locked when vfs_object_create is called. |
| 1654 | */ |
| 1655 | int |
| 1656 | vfs_object_create(struct vnode *vp, struct thread *td) |
| 1657 | { |
| 1658 | return (VOP_CREATEVOBJECT(vp, td)); |
| 1659 | } |
| 1660 | |
| 1661 | /* |
| 1662 | * Record a process's interest in events which might happen to |
| 1663 | * a vnode. Because poll uses the historic select-style interface |
| 1664 | * internally, this routine serves as both the ``check for any |
| 1665 | * pending events'' and the ``record my interest in future events'' |
| 1666 | * functions. (These are done together, while the lock is held, |
| 1667 | * to avoid race conditions.) |
| 1668 | */ |
| 1669 | int |
| 1670 | vn_pollrecord(struct vnode *vp, struct thread *td, int events) |
| 1671 | { |
| 1672 | lwkt_tokref ilock; |
| 1673 | |
| 1674 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 1675 | if (vp->v_pollinfo.vpi_revents & events) { |
| 1676 | /* |
| 1677 | * This leaves events we are not interested |
| 1678 | * in available for the other process which |
| 1679 | * which presumably had requested them |
| 1680 | * (otherwise they would never have been |
| 1681 | * recorded). |
| 1682 | */ |
| 1683 | events &= vp->v_pollinfo.vpi_revents; |
| 1684 | vp->v_pollinfo.vpi_revents &= ~events; |
| 1685 | |
| 1686 | lwkt_reltoken(&ilock); |
| 1687 | return events; |
| 1688 | } |
| 1689 | vp->v_pollinfo.vpi_events |= events; |
| 1690 | selrecord(td, &vp->v_pollinfo.vpi_selinfo); |
| 1691 | lwkt_reltoken(&ilock); |
| 1692 | return 0; |
| 1693 | } |
| 1694 | |
| 1695 | /* |
| 1696 | * Note the occurrence of an event. If the VN_POLLEVENT macro is used, |
| 1697 | * it is possible for us to miss an event due to race conditions, but |
| 1698 | * that condition is expected to be rare, so for the moment it is the |
| 1699 | * preferred interface. |
| 1700 | */ |
| 1701 | void |
| 1702 | vn_pollevent(struct vnode *vp, int events) |
| 1703 | { |
| 1704 | lwkt_tokref ilock; |
| 1705 | |
| 1706 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 1707 | if (vp->v_pollinfo.vpi_events & events) { |
| 1708 | /* |
| 1709 | * We clear vpi_events so that we don't |
| 1710 | * call selwakeup() twice if two events are |
| 1711 | * posted before the polling process(es) is |
| 1712 | * awakened. This also ensures that we take at |
| 1713 | * most one selwakeup() if the polling process |
| 1714 | * is no longer interested. However, it does |
| 1715 | * mean that only one event can be noticed at |
| 1716 | * a time. (Perhaps we should only clear those |
| 1717 | * event bits which we note?) XXX |
| 1718 | */ |
| 1719 | vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */ |
| 1720 | vp->v_pollinfo.vpi_revents |= events; |
| 1721 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 1722 | } |
| 1723 | lwkt_reltoken(&ilock); |
| 1724 | } |
| 1725 | |
| 1726 | /* |
| 1727 | * Wake up anyone polling on vp because it is being revoked. |
| 1728 | * This depends on dead_poll() returning POLLHUP for correct |
| 1729 | * behavior. |
| 1730 | */ |
| 1731 | void |
| 1732 | vn_pollgone(struct vnode *vp) |
| 1733 | { |
| 1734 | lwkt_tokref ilock; |
| 1735 | |
| 1736 | lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token); |
| 1737 | if (vp->v_pollinfo.vpi_events) { |
| 1738 | vp->v_pollinfo.vpi_events = 0; |
| 1739 | selwakeup(&vp->v_pollinfo.vpi_selinfo); |
| 1740 | } |
| 1741 | lwkt_reltoken(&ilock); |
| 1742 | } |
| 1743 | |
| 1744 | /* |
| 1745 | * extract the dev_t from a VBLK or VCHR. The vnode must have been opened |
| 1746 | * (or v_rdev might be NULL). |
| 1747 | */ |
| 1748 | dev_t |
| 1749 | vn_todev(struct vnode *vp) |
| 1750 | { |
| 1751 | if (vp->v_type != VBLK && vp->v_type != VCHR) |
| 1752 | return (NODEV); |
| 1753 | KKASSERT(vp->v_rdev != NULL); |
| 1754 | return (vp->v_rdev); |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * Check if vnode represents a disk device. The vnode does not need to be |
| 1759 | * opened. |
| 1760 | */ |
| 1761 | int |
| 1762 | vn_isdisk(struct vnode *vp, int *errp) |
| 1763 | { |
| 1764 | dev_t dev; |
| 1765 | |
| 1766 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
| 1767 | if (errp != NULL) |
| 1768 | *errp = ENOTBLK; |
| 1769 | return (0); |
| 1770 | } |
| 1771 | |
| 1772 | if ((dev = vp->v_rdev) == NULL) |
| 1773 | dev = udev2dev(vp->v_udev, (vp->v_type == VBLK)); |
| 1774 | if (dev == NULL || dev == NODEV) { |
| 1775 | if (errp != NULL) |
| 1776 | *errp = ENXIO; |
| 1777 | return (0); |
| 1778 | } |
| 1779 | if (dev_is_good(dev) == 0) { |
| 1780 | if (errp != NULL) |
| 1781 | *errp = ENXIO; |
| 1782 | return (0); |
| 1783 | } |
| 1784 | if ((dev_dflags(dev) & D_DISK) == 0) { |
| 1785 | if (errp != NULL) |
| 1786 | *errp = ENOTBLK; |
| 1787 | return (0); |
| 1788 | } |
| 1789 | if (errp != NULL) |
| 1790 | *errp = 0; |
| 1791 | return (1); |
| 1792 | } |
| 1793 | |
| 1794 | #ifdef DEBUG_VFS_LOCKS |
| 1795 | |
| 1796 | void |
| 1797 | assert_vop_locked(struct vnode *vp, const char *str) |
| 1798 | { |
| 1799 | if (vp && IS_LOCKING_VFS(vp) && !VOP_ISLOCKED(vp, NULL)) { |
| 1800 | panic("%s: %p is not locked shared but should be", str, vp); |
| 1801 | } |
| 1802 | } |
| 1803 | |
| 1804 | void |
| 1805 | assert_vop_unlocked(struct vnode *vp, const char *str) |
| 1806 | { |
| 1807 | if (vp && IS_LOCKING_VFS(vp)) { |
| 1808 | if (VOP_ISLOCKED(vp, curthread) == LK_EXCLUSIVE) { |
| 1809 | panic("%s: %p is locked but should not be", str, vp); |
| 1810 | } |
| 1811 | } |
| 1812 | } |
| 1813 | |
| 1814 | #endif |