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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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
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 1.118 2008/09/17 21:44:18 dillon Exp $
44 * External virtual filesystem routines
48 #include <sys/param.h>
49 #include <sys/systm.h>
52 #include <sys/dirent.h>
53 #include <sys/domain.h>
54 #include <sys/eventhandler.h>
55 #include <sys/fcntl.h>
57 #include <sys/kernel.h>
58 #include <sys/kthread.h>
59 #include <sys/malloc.h>
61 #include <sys/mount.h>
63 #include <sys/reboot.h>
64 #include <sys/socket.h>
66 #include <sys/sysctl.h>
67 #include <sys/syslog.h>
68 #include <sys/unistd.h>
69 #include <sys/vmmeter.h>
70 #include <sys/vnode.h>
72 #include <machine/limits.h>
75 #include <vm/vm_object.h>
76 #include <vm/vm_extern.h>
77 #include <vm/vm_kern.h>
79 #include <vm/vm_map.h>
80 #include <vm/vm_page.h>
81 #include <vm/vm_pager.h>
82 #include <vm/vnode_pager.h>
83 #include <vm/vm_zone.h>
86 #include <sys/thread2.h>
87 #include <sys/sysref2.h>
89 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
92 SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, "");
94 SYSCTL_INT(_vfs, OID_AUTO, fastdev, CTLFLAG_RW, &vfs_fastdev, 0, "");
96 enum vtype iftovt_tab[16] = {
97 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
98 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
100 int vttoif_tab[9] = {
101 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
102 S_IFSOCK, S_IFIFO, S_IFMT,
105 static int reassignbufcalls;
106 SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW,
107 &reassignbufcalls, 0, "");
108 static int reassignbufloops;
109 SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW,
110 &reassignbufloops, 0, "");
111 static int reassignbufsortgood;
112 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW,
113 &reassignbufsortgood, 0, "");
114 static int reassignbufsortbad;
115 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW,
116 &reassignbufsortbad, 0, "");
117 static int reassignbufmethod = 1;
118 SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW,
119 &reassignbufmethod, 0, "");
121 int nfs_mount_type = -1;
122 static struct lwkt_token spechash_token;
123 struct nfs_public nfs_pub; /* publicly exported FS */
126 SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW,
127 &desiredvnodes, 0, "Maximum number of vnodes");
129 static void vfs_free_addrlist (struct netexport *nep);
130 static int vfs_free_netcred (struct radix_node *rn, void *w);
131 static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep,
132 const struct export_args *argp);
134 extern int dev_ref_debug;
137 * Red black tree functions
139 static int rb_buf_compare(struct buf *b1, struct buf *b2);
140 RB_GENERATE2(buf_rb_tree, buf, b_rbnode, rb_buf_compare, off_t, b_loffset);
141 RB_GENERATE2(buf_rb_hash, buf, b_rbhash, rb_buf_compare, off_t, b_loffset);
144 rb_buf_compare(struct buf *b1, struct buf *b2)
146 if (b1->b_loffset < b2->b_loffset)
148 if (b1->b_loffset > b2->b_loffset)
154 * Returns non-zero if the vnode is a candidate for lazy msyncing.
157 vshouldmsync(struct vnode *vp)
159 if (vp->v_auxrefs != 0 || vp->v_sysref.refcnt > 0)
160 return (0); /* other holders */
162 (vp->v_object->ref_count || vp->v_object->resident_page_count)) {
169 * Initialize the vnode management data structures.
171 * Called from vfsinit()
177 * Desiredvnodes is kern.maxvnodes. We want to scale it
178 * according to available system memory but we may also have
179 * to limit it based on available KVM, which is capped on 32 bit
182 desiredvnodes = min(maxproc + vmstats.v_page_count / 4,
184 (sizeof(struct vm_object) + sizeof(struct vnode))));
186 lwkt_token_init(&spechash_token);
190 * Knob to control the precision of file timestamps:
192 * 0 = seconds only; nanoseconds zeroed.
193 * 1 = seconds and nanoseconds, accurate within 1/HZ.
194 * 2 = seconds and nanoseconds, truncated to microseconds.
195 * >=3 = seconds and nanoseconds, maximum precision.
197 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
199 static int timestamp_precision = TSP_SEC;
200 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
201 ×tamp_precision, 0, "");
204 * Get a current timestamp.
207 vfs_timestamp(struct timespec *tsp)
211 switch (timestamp_precision) {
213 tsp->tv_sec = time_second;
221 TIMEVAL_TO_TIMESPEC(&tv, tsp);
231 * Set vnode attributes to VNOVAL
234 vattr_null(struct vattr *vap)
237 vap->va_size = VNOVAL;
238 vap->va_bytes = VNOVAL;
239 vap->va_mode = VNOVAL;
240 vap->va_nlink = VNOVAL;
241 vap->va_uid = VNOVAL;
242 vap->va_gid = VNOVAL;
243 vap->va_fsid = VNOVAL;
244 vap->va_fileid = VNOVAL;
245 vap->va_blocksize = VNOVAL;
246 vap->va_rmajor = VNOVAL;
247 vap->va_rminor = VNOVAL;
248 vap->va_atime.tv_sec = VNOVAL;
249 vap->va_atime.tv_nsec = VNOVAL;
250 vap->va_mtime.tv_sec = VNOVAL;
251 vap->va_mtime.tv_nsec = VNOVAL;
252 vap->va_ctime.tv_sec = VNOVAL;
253 vap->va_ctime.tv_nsec = VNOVAL;
254 vap->va_flags = VNOVAL;
255 vap->va_gen = VNOVAL;
257 vap->va_fsmid = VNOVAL;
258 /* va_*_uuid fields are only valid if related flags are set */
262 * Flush out and invalidate all buffers associated with a vnode.
266 static int vinvalbuf_bp(struct buf *bp, void *data);
268 struct vinvalbuf_bp_info {
276 vupdatefsmid(struct vnode *vp)
278 atomic_set_int(&vp->v_flag, VFSMID);
282 vinvalbuf(struct vnode *vp, int flags, int slpflag, int slptimeo)
284 struct vinvalbuf_bp_info info;
289 * If we are being asked to save, call fsync to ensure that the inode
292 if (flags & V_SAVE) {
294 while (vp->v_track_write.bk_active) {
295 vp->v_track_write.bk_waitflag = 1;
296 error = tsleep(&vp->v_track_write, slpflag,
297 "vinvlbuf", slptimeo);
303 if (!RB_EMPTY(&vp->v_rbdirty_tree)) {
305 if ((error = VOP_FSYNC(vp, MNT_WAIT)) != 0)
310 * Dirty bufs may be left or generated via races
311 * in circumstances where vinvalbuf() is called on
312 * a vnode not undergoing reclamation. Only
313 * panic if we are trying to reclaim the vnode.
315 if ((vp->v_flag & VRECLAIMED) &&
316 (vp->v_track_write.bk_active > 0 ||
317 !RB_EMPTY(&vp->v_rbdirty_tree))) {
318 panic("vinvalbuf: dirty bufs");
324 info.slptimeo = slptimeo;
325 info.lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL;
326 if (slpflag & PCATCH)
327 info.lkflags |= LK_PCATCH;
332 * Flush the buffer cache until nothing is left.
334 while (!RB_EMPTY(&vp->v_rbclean_tree) ||
335 !RB_EMPTY(&vp->v_rbdirty_tree)) {
336 error = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree, NULL,
337 vinvalbuf_bp, &info);
339 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
340 vinvalbuf_bp, &info);
345 * Wait for I/O to complete. XXX needs cleaning up. The vnode can
346 * have write I/O in-progress but if there is a VM object then the
347 * VM object can also have read-I/O in-progress.
350 while (vp->v_track_write.bk_active > 0) {
351 vp->v_track_write.bk_waitflag = 1;
352 tsleep(&vp->v_track_write, 0, "vnvlbv", 0);
354 if ((object = vp->v_object) != NULL) {
355 while (object->paging_in_progress)
356 vm_object_pip_sleep(object, "vnvlbx");
358 } while (vp->v_track_write.bk_active > 0);
363 * Destroy the copy in the VM cache, too.
365 if ((object = vp->v_object) != NULL) {
366 vm_object_page_remove(object, 0, 0,
367 (flags & V_SAVE) ? TRUE : FALSE);
370 if (!RB_EMPTY(&vp->v_rbdirty_tree) || !RB_EMPTY(&vp->v_rbclean_tree))
371 panic("vinvalbuf: flush failed");
372 if (!RB_EMPTY(&vp->v_rbhash_tree))
373 panic("vinvalbuf: flush failed, buffers still present");
378 vinvalbuf_bp(struct buf *bp, void *data)
380 struct vinvalbuf_bp_info *info = data;
383 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
384 error = BUF_TIMELOCK(bp, info->lkflags,
385 "vinvalbuf", info->slptimeo);
395 KKASSERT(bp->b_vp == info->vp);
398 * XXX Since there are no node locks for NFS, I
399 * believe there is a slight chance that a delayed
400 * write will occur while sleeping just above, so
401 * check for it. Note that vfs_bio_awrite expects
402 * buffers to reside on a queue, while bwrite() and
405 * NOTE: NO B_LOCKED CHECK. Also no buf_checkwrite()
406 * check. This code will write out the buffer, period.
408 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
409 (info->flags & V_SAVE)) {
410 if (bp->b_vp == info->vp) {
411 if (bp->b_flags & B_CLUSTEROK) {
415 bp->b_flags |= B_ASYNC;
422 } else if (info->flags & V_SAVE) {
424 * Cannot set B_NOCACHE on a clean buffer as this will
425 * destroy the VM backing store which might actually
426 * be dirty (and unsynchronized).
429 bp->b_flags |= (B_INVAL | B_RELBUF);
430 bp->b_flags &= ~B_ASYNC;
434 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
435 bp->b_flags &= ~B_ASYNC;
442 * Truncate a file's buffer and pages to a specified length. This
443 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
446 * The vnode must be locked.
448 static int vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data);
449 static int vtruncbuf_bp_trunc(struct buf *bp, void *data);
450 static int vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data);
451 static int vtruncbuf_bp_metasync(struct buf *bp, void *data);
454 vtruncbuf(struct vnode *vp, off_t length, int blksize)
458 const char *filename;
461 * Round up to the *next* block, then destroy the buffers in question.
462 * Since we are only removing some of the buffers we must rely on the
463 * scan count to determine whether a loop is necessary.
465 if ((count = (int)(length % blksize)) != 0)
466 truncloffset = length + (blksize - count);
468 truncloffset = length;
472 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
473 vtruncbuf_bp_trunc_cmp,
474 vtruncbuf_bp_trunc, &truncloffset);
475 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
476 vtruncbuf_bp_trunc_cmp,
477 vtruncbuf_bp_trunc, &truncloffset);
481 * For safety, fsync any remaining metadata if the file is not being
482 * truncated to 0. Since the metadata does not represent the entire
483 * dirty list we have to rely on the hit count to ensure that we get
488 count = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
489 vtruncbuf_bp_metasync_cmp,
490 vtruncbuf_bp_metasync, vp);
495 * Clean out any left over VM backing store.
499 vnode_pager_setsize(vp, length);
504 * It is possible to have in-progress I/O from buffers that were
505 * not part of the truncation. This should not happen if we
506 * are truncating to 0-length.
508 filename = TAILQ_FIRST(&vp->v_namecache) ?
509 TAILQ_FIRST(&vp->v_namecache)->nc_name : "?";
511 while ((count = vp->v_track_write.bk_active) > 0) {
512 vp->v_track_write.bk_waitflag = 1;
513 tsleep(&vp->v_track_write, 0, "vbtrunc", 0);
515 kprintf("Warning: vtruncbuf(): Had to wait for "
516 "%d buffer I/Os to finish in %s\n",
522 * Make sure no buffers were instantiated while we were trying
523 * to clean out the remaining VM pages. This could occur due
524 * to busy dirty VM pages being flushed out to disk.
527 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
528 vtruncbuf_bp_trunc_cmp,
529 vtruncbuf_bp_trunc, &truncloffset);
530 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
531 vtruncbuf_bp_trunc_cmp,
532 vtruncbuf_bp_trunc, &truncloffset);
534 kprintf("Warning: vtruncbuf(): Had to re-clean %d "
535 "left over buffers in %s\n", count, filename);
545 * The callback buffer is beyond the new file EOF and must be destroyed.
546 * Note that the compare function must conform to the RB_SCAN's requirements.
550 vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data)
552 if (bp->b_loffset >= *(off_t *)data)
559 vtruncbuf_bp_trunc(struct buf *bp, void *data)
562 * Do not try to use a buffer we cannot immediately lock, but sleep
563 * anyway to prevent a livelock. The code will loop until all buffers
566 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
567 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
571 bp->b_flags |= (B_INVAL | B_RELBUF | B_NOCACHE);
572 bp->b_flags &= ~B_ASYNC;
579 * Fsync all meta-data after truncating a file to be non-zero. Only metadata
580 * blocks (with a negative loffset) are scanned.
581 * Note that the compare function must conform to the RB_SCAN's requirements.
584 vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data)
586 if (bp->b_loffset < 0)
592 vtruncbuf_bp_metasync(struct buf *bp, void *data)
594 struct vnode *vp = data;
596 if (bp->b_flags & B_DELWRI) {
598 * Do not try to use a buffer we cannot immediately lock,
599 * but sleep anyway to prevent a livelock. The code will
600 * loop until all buffers can be acted upon.
602 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
603 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
607 if (bp->b_vp == vp) {
608 bp->b_flags |= B_ASYNC;
610 bp->b_flags &= ~B_ASYNC;
621 * vfsync - implements a multipass fsync on a file which understands
622 * dependancies and meta-data. The passed vnode must be locked. The
623 * waitfor argument may be MNT_WAIT or MNT_NOWAIT, or MNT_LAZY.
625 * When fsyncing data asynchronously just do one consolidated pass starting
626 * with the most negative block number. This may not get all the data due
629 * When fsyncing data synchronously do a data pass, then a metadata pass,
630 * then do additional data+metadata passes to try to get all the data out.
632 static int vfsync_wait_output(struct vnode *vp,
633 int (*waitoutput)(struct vnode *, struct thread *));
634 static int vfsync_data_only_cmp(struct buf *bp, void *data);
635 static int vfsync_meta_only_cmp(struct buf *bp, void *data);
636 static int vfsync_lazy_range_cmp(struct buf *bp, void *data);
637 static int vfsync_bp(struct buf *bp, void *data);
646 int (*checkdef)(struct buf *);
650 vfsync(struct vnode *vp, int waitfor, int passes,
651 int (*checkdef)(struct buf *),
652 int (*waitoutput)(struct vnode *, struct thread *))
654 struct vfsync_info info;
657 bzero(&info, sizeof(info));
659 if ((info.checkdef = checkdef) == NULL)
662 crit_enter_id("vfsync");
667 * Lazy (filesystem syncer typ) Asynchronous plus limit the
668 * number of data (not meta) pages we try to flush to 1MB.
669 * A non-zero return means that lazy limit was reached.
671 info.lazylimit = 1024 * 1024;
673 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
674 vfsync_lazy_range_cmp, vfsync_bp, &info);
675 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
676 vfsync_meta_only_cmp, vfsync_bp, &info);
679 else if (!RB_EMPTY(&vp->v_rbdirty_tree))
680 vn_syncer_add_to_worklist(vp, 1);
685 * Asynchronous. Do a data-only pass and a meta-only pass.
688 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
690 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_meta_only_cmp,
696 * Synchronous. Do a data-only pass, then a meta-data+data
697 * pass, then additional integrated passes to try to get
698 * all the dependancies flushed.
700 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
702 error = vfsync_wait_output(vp, waitoutput);
704 info.skippedbufs = 0;
705 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
707 error = vfsync_wait_output(vp, waitoutput);
708 if (info.skippedbufs)
709 kprintf("Warning: vfsync skipped %d dirty bufs in pass2!\n", info.skippedbufs);
711 while (error == 0 && passes > 0 &&
712 !RB_EMPTY(&vp->v_rbdirty_tree)) {
714 info.synchronous = 1;
717 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
723 error = vfsync_wait_output(vp, waitoutput);
727 crit_exit_id("vfsync");
732 vfsync_wait_output(struct vnode *vp, int (*waitoutput)(struct vnode *, struct thread *))
736 while (vp->v_track_write.bk_active) {
737 vp->v_track_write.bk_waitflag = 1;
738 tsleep(&vp->v_track_write, 0, "fsfsn", 0);
741 error = waitoutput(vp, curthread);
746 vfsync_data_only_cmp(struct buf *bp, void *data)
748 if (bp->b_loffset < 0)
754 vfsync_meta_only_cmp(struct buf *bp, void *data)
756 if (bp->b_loffset < 0)
762 vfsync_lazy_range_cmp(struct buf *bp, void *data)
764 struct vfsync_info *info = data;
765 if (bp->b_loffset < info->vp->v_lazyw)
771 vfsync_bp(struct buf *bp, void *data)
773 struct vfsync_info *info = data;
774 struct vnode *vp = info->vp;
778 * if syncdeps is not set we do not try to write buffers which have
781 if (!info->synchronous && info->syncdeps == 0 && info->checkdef(bp))
785 * Ignore buffers that we cannot immediately lock. XXX
787 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
788 kprintf("Warning: vfsync_bp skipping dirty buffer %p\n", bp);
792 if ((bp->b_flags & B_DELWRI) == 0)
793 panic("vfsync_bp: buffer not dirty");
795 panic("vfsync_bp: buffer vp mismatch");
798 * B_NEEDCOMMIT (primarily used by NFS) is a state where the buffer
799 * has been written but an additional handshake with the device
800 * is required before we can dispose of the buffer. We have no idea
801 * how to do this so we have to skip these buffers.
803 if (bp->b_flags & B_NEEDCOMMIT) {
809 * Ask bioops if it is ok to sync
811 if (LIST_FIRST(&bp->b_dep) != NULL && buf_checkwrite(bp)) {
817 if (info->synchronous) {
819 * Synchronous flushing. An error may be returned.
822 crit_exit_id("vfsync");
824 crit_enter_id("vfsync");
827 * Asynchronous flushing. A negative return value simply
828 * stops the scan and is not considered an error. We use
829 * this to support limited MNT_LAZY flushes.
831 vp->v_lazyw = bp->b_loffset;
832 if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
833 info->lazycount += vfs_bio_awrite(bp);
835 info->lazycount += bp->b_bufsize;
837 crit_exit_id("vfsync");
839 crit_enter_id("vfsync");
841 if (info->lazylimit && info->lazycount >= info->lazylimit)
850 * Associate a buffer with a vnode.
853 bgetvp(struct vnode *vp, struct buf *bp)
855 KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
856 KKASSERT((bp->b_flags & (B_HASHED|B_DELWRI|B_VNCLEAN|B_VNDIRTY)) == 0);
860 * Insert onto list for new vnode.
864 bp->b_flags |= B_HASHED;
865 if (buf_rb_hash_RB_INSERT(&vp->v_rbhash_tree, bp))
866 panic("reassignbuf: dup lblk vp %p bp %p", vp, bp);
868 bp->b_flags |= B_VNCLEAN;
869 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp))
870 panic("reassignbuf: dup lblk/clean vp %p bp %p", vp, bp);
875 * Disassociate a buffer from a vnode.
878 brelvp(struct buf *bp)
882 KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
885 * Delete from old vnode list, if on one.
889 if (bp->b_flags & (B_VNDIRTY | B_VNCLEAN)) {
890 if (bp->b_flags & B_VNDIRTY)
891 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
893 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
894 bp->b_flags &= ~(B_VNDIRTY | B_VNCLEAN);
896 if (bp->b_flags & B_HASHED) {
897 buf_rb_hash_RB_REMOVE(&vp->v_rbhash_tree, bp);
898 bp->b_flags &= ~B_HASHED;
900 if ((vp->v_flag & VONWORKLST) && RB_EMPTY(&vp->v_rbdirty_tree)) {
901 vp->v_flag &= ~VONWORKLST;
902 LIST_REMOVE(vp, v_synclist);
910 * Reassign the buffer to the proper clean/dirty list based on B_DELWRI.
911 * This routine is called when the state of the B_DELWRI bit is changed.
914 reassignbuf(struct buf *bp)
916 struct vnode *vp = bp->b_vp;
919 KKASSERT(vp != NULL);
923 * B_PAGING flagged buffers cannot be reassigned because their vp
924 * is not fully linked in.
926 if (bp->b_flags & B_PAGING)
927 panic("cannot reassign paging buffer");
930 if (bp->b_flags & B_DELWRI) {
932 * Move to the dirty list, add the vnode to the worklist
934 if (bp->b_flags & B_VNCLEAN) {
935 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
936 bp->b_flags &= ~B_VNCLEAN;
938 if ((bp->b_flags & B_VNDIRTY) == 0) {
939 if (buf_rb_tree_RB_INSERT(&vp->v_rbdirty_tree, bp)) {
940 panic("reassignbuf: dup lblk vp %p bp %p",
943 bp->b_flags |= B_VNDIRTY;
945 if ((vp->v_flag & VONWORKLST) == 0) {
946 switch (vp->v_type) {
953 vp->v_rdev->si_mountpoint != NULL) {
961 vn_syncer_add_to_worklist(vp, delay);
965 * Move to the clean list, remove the vnode from the worklist
966 * if no dirty blocks remain.
968 if (bp->b_flags & B_VNDIRTY) {
969 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
970 bp->b_flags &= ~B_VNDIRTY;
972 if ((bp->b_flags & B_VNCLEAN) == 0) {
973 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
974 panic("reassignbuf: dup lblk vp %p bp %p",
977 bp->b_flags |= B_VNCLEAN;
979 if ((vp->v_flag & VONWORKLST) &&
980 RB_EMPTY(&vp->v_rbdirty_tree)) {
981 vp->v_flag &= ~VONWORKLST;
982 LIST_REMOVE(vp, v_synclist);
989 * Create a vnode for a block device.
990 * Used for mounting the root file system.
993 bdevvp(cdev_t dev, struct vnode **vpp)
1003 error = getspecialvnode(VT_NON, NULL, &spec_vnode_vops_p, &nvp, 0, 0);
1010 vp->v_umajor = dev->si_umajor;
1011 vp->v_uminor = dev->si_uminor;
1018 v_associate_rdev(struct vnode *vp, cdev_t dev)
1024 if (dev_is_good(dev) == 0)
1026 KKASSERT(vp->v_rdev == NULL);
1029 vp->v_rdev = reference_dev(dev);
1030 lwkt_gettoken(&ilock, &spechash_token);
1031 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_cdevnext);
1032 lwkt_reltoken(&ilock);
1037 v_release_rdev(struct vnode *vp)
1042 if ((dev = vp->v_rdev) != NULL) {
1043 lwkt_gettoken(&ilock, &spechash_token);
1044 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_cdevnext);
1047 lwkt_reltoken(&ilock);
1052 * Add a vnode to the alias list hung off the cdev_t. We only associate
1053 * the device number with the vnode. The actual device is not associated
1054 * until the vnode is opened (usually in spec_open()), and will be
1055 * disassociated on last close.
1058 addaliasu(struct vnode *nvp, int x, int y)
1060 if (nvp->v_type != VBLK && nvp->v_type != VCHR)
1061 panic("addaliasu on non-special vnode");
1067 * Simple call that a filesystem can make to try to get rid of a
1068 * vnode. It will fail if anyone is referencing the vnode (including
1071 * The filesystem can check whether its in-memory inode structure still
1072 * references the vp on return.
1075 vclean_unlocked(struct vnode *vp)
1078 if (sysref_isactive(&vp->v_sysref) == 0)
1084 * Disassociate a vnode from its underlying filesystem.
1086 * The vnode must be VX locked and referenced. In all normal situations
1087 * there are no active references. If vclean_vxlocked() is called while
1088 * there are active references, the vnode is being ripped out and we have
1089 * to call VOP_CLOSE() as appropriate before we can reclaim it.
1092 vclean_vxlocked(struct vnode *vp, int flags)
1099 * If the vnode has already been reclaimed we have nothing to do.
1101 if (vp->v_flag & VRECLAIMED)
1103 vp->v_flag |= VRECLAIMED;
1106 * Scrap the vfs cache
1108 while (cache_inval_vp(vp, 0) != 0) {
1109 kprintf("Warning: vnode %p clean/cache_resolution race detected\n", vp);
1110 tsleep(vp, 0, "vclninv", 2);
1114 * Check to see if the vnode is in use. If so we have to reference it
1115 * before we clean it out so that its count cannot fall to zero and
1116 * generate a race against ourselves to recycle it.
1118 active = sysref_isactive(&vp->v_sysref);
1121 * Clean out any buffers associated with the vnode and destroy its
1122 * object, if it has one.
1124 vinvalbuf(vp, V_SAVE, 0, 0);
1127 * If purging an active vnode (typically during a forced unmount
1128 * or reboot), it must be closed and deactivated before being
1129 * reclaimed. This isn't really all that safe, but what can
1132 * Note that neither of these routines unlocks the vnode.
1134 if (active && (flags & DOCLOSE)) {
1135 while ((n = vp->v_opencount) != 0) {
1136 if (vp->v_writecount)
1137 VOP_CLOSE(vp, FWRITE|FNONBLOCK);
1139 VOP_CLOSE(vp, FNONBLOCK);
1140 if (vp->v_opencount == n) {
1141 kprintf("Warning: unable to force-close"
1149 * If the vnode has not been deactivated, deactivated it. Deactivation
1150 * can create new buffers and VM pages so we have to call vinvalbuf()
1151 * again to make sure they all get flushed.
1153 * This can occur if a file with a link count of 0 needs to be
1156 if ((vp->v_flag & VINACTIVE) == 0) {
1157 vp->v_flag |= VINACTIVE;
1159 vinvalbuf(vp, V_SAVE, 0, 0);
1163 * If the vnode has an object, destroy it.
1165 if ((object = vp->v_object) != NULL) {
1166 if (object->ref_count == 0) {
1167 if ((object->flags & OBJ_DEAD) == 0)
1168 vm_object_terminate(object);
1170 vm_pager_deallocate(object);
1172 vp->v_flag &= ~VOBJBUF;
1174 KKASSERT((vp->v_flag & VOBJBUF) == 0);
1177 * Reclaim the vnode.
1179 if (VOP_RECLAIM(vp))
1180 panic("vclean: cannot reclaim");
1183 * Done with purge, notify sleepers of the grim news.
1185 vp->v_ops = &dead_vnode_vops_p;
1190 * If we are destroying an active vnode, reactivate it now that
1191 * we have reassociated it with deadfs. This prevents the system
1192 * from crashing on the vnode due to it being unexpectedly marked
1193 * as inactive or reclaimed.
1195 if (active && (flags & DOCLOSE)) {
1196 vp->v_flag &= ~(VINACTIVE|VRECLAIMED);
1201 * Eliminate all activity associated with the requested vnode
1202 * and with all vnodes aliased to the requested vnode.
1204 * The vnode must be referenced but should not be locked.
1207 vrevoke(struct vnode *vp, struct ucred *cred)
1215 * If the vnode has a device association, scrap all vnodes associated
1216 * with the device. Don't let the device disappear on us while we
1217 * are scrapping the vnodes.
1219 * The passed vp will probably show up in the list, do not VX lock
1222 if (vp->v_type != VCHR) {
1223 error = fdrevoke(vp, DTYPE_VNODE, cred);
1226 if ((dev = vp->v_rdev) == NULL) {
1227 if ((dev = get_dev(vp->v_umajor, vp->v_uminor)) == NULL)
1231 lwkt_gettoken(&ilock, &spechash_token);
1232 while ((vq = SLIST_FIRST(&dev->si_hlist)) != NULL) {
1234 fdrevoke(vq, DTYPE_VNODE, cred);
1238 lwkt_reltoken(&ilock);
1244 * This is called when the object underlying a vnode is being destroyed,
1245 * such as in a remove(). Try to recycle the vnode immediately if the
1246 * only active reference is our reference.
1248 * Directory vnodes in the namecache with children cannot be immediately
1249 * recycled because numerous VOP_N*() ops require them to be stable.
1252 vrecycle(struct vnode *vp)
1254 if (vp->v_sysref.refcnt <= 1) {
1255 if (cache_inval_vp_nonblock(vp))
1264 * Return the maximum I/O size allowed for strategy calls on VP.
1266 * If vp is VCHR or VBLK we dive the device, otherwise we use
1267 * the vp's mount info.
1270 vmaxiosize(struct vnode *vp)
1272 if (vp->v_type == VBLK || vp->v_type == VCHR) {
1273 return(vp->v_rdev->si_iosize_max);
1275 return(vp->v_mount->mnt_iosize_max);
1280 * Eliminate all activity associated with a vnode in preparation for reuse.
1282 * The vnode must be VX locked and refd and will remain VX locked and refd
1283 * on return. This routine may be called with the vnode in any state, as
1284 * long as it is VX locked. The vnode will be cleaned out and marked
1285 * VRECLAIMED but will not actually be reused until all existing refs and
1288 * NOTE: This routine may be called on a vnode which has not yet been
1289 * already been deactivated (VOP_INACTIVE), or on a vnode which has
1290 * already been reclaimed.
1292 * This routine is not responsible for placing us back on the freelist.
1293 * Instead, it happens automatically when the caller releases the VX lock
1294 * (assuming there aren't any other references).
1298 vgone_vxlocked(struct vnode *vp)
1301 * assert that the VX lock is held. This is an absolute requirement
1302 * now for vgone_vxlocked() to be called.
1304 KKASSERT(vp->v_lock.lk_exclusivecount == 1);
1307 * Clean out the filesystem specific data and set the VRECLAIMED
1308 * bit. Also deactivate the vnode if necessary.
1310 vclean_vxlocked(vp, DOCLOSE);
1313 * Delete from old mount point vnode list, if on one.
1315 if (vp->v_mount != NULL)
1316 insmntque(vp, NULL);
1319 * If special device, remove it from special device alias list
1320 * if it is on one. This should normally only occur if a vnode is
1321 * being revoked as the device should otherwise have been released
1324 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) {
1335 * Lookup a vnode by device number.
1337 * Returns non-zero and *vpp set to a vref'd vnode on success.
1338 * Returns zero on failure.
1341 vfinddev(cdev_t dev, enum vtype type, struct vnode **vpp)
1346 lwkt_gettoken(&ilock, &spechash_token);
1347 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1348 if (type == vp->v_type) {
1351 lwkt_reltoken(&ilock);
1355 lwkt_reltoken(&ilock);
1360 * Calculate the total number of references to a special device. This
1361 * routine may only be called for VBLK and VCHR vnodes since v_rdev is
1362 * an overloaded field. Since udev2dev can now return NULL, we have
1363 * to check for a NULL v_rdev.
1366 count_dev(cdev_t dev)
1372 if (SLIST_FIRST(&dev->si_hlist)) {
1373 lwkt_gettoken(&ilock, &spechash_token);
1374 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1375 if (vp->v_sysref.refcnt > 0)
1376 count += vp->v_sysref.refcnt;
1378 lwkt_reltoken(&ilock);
1384 count_udev(int x, int y)
1388 if ((dev = get_dev(x, y)) == NULL)
1390 return(count_dev(dev));
1394 vcount(struct vnode *vp)
1396 if (vp->v_rdev == NULL)
1398 return(count_dev(vp->v_rdev));
1402 * Initialize VMIO for a vnode. This routine MUST be called before a
1403 * VFS can issue buffer cache ops on a vnode. It is typically called
1404 * when a vnode is initialized from its inode.
1407 vinitvmio(struct vnode *vp, off_t filesize)
1413 if ((object = vp->v_object) == NULL) {
1414 object = vnode_pager_alloc(vp, filesize, 0, 0);
1416 * Dereference the reference we just created. This assumes
1417 * that the object is associated with the vp.
1419 object->ref_count--;
1422 if (object->flags & OBJ_DEAD) {
1424 vm_object_dead_sleep(object, "vodead");
1425 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1429 KASSERT(vp->v_object != NULL, ("vinitvmio: NULL object"));
1430 vp->v_flag |= VOBJBUF;
1436 * Print out a description of a vnode.
1438 static char *typename[] =
1439 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
1442 vprint(char *label, struct vnode *vp)
1447 kprintf("%s: %p: ", label, (void *)vp);
1449 kprintf("%p: ", (void *)vp);
1450 kprintf("type %s, sysrefs %d, writecount %d, holdcnt %d,",
1451 typename[vp->v_type],
1452 vp->v_sysref.refcnt, vp->v_writecount, vp->v_auxrefs);
1454 if (vp->v_flag & VROOT)
1455 strcat(buf, "|VROOT");
1456 if (vp->v_flag & VPFSROOT)
1457 strcat(buf, "|VPFSROOT");
1458 if (vp->v_flag & VTEXT)
1459 strcat(buf, "|VTEXT");
1460 if (vp->v_flag & VSYSTEM)
1461 strcat(buf, "|VSYSTEM");
1462 if (vp->v_flag & VFREE)
1463 strcat(buf, "|VFREE");
1464 if (vp->v_flag & VOBJBUF)
1465 strcat(buf, "|VOBJBUF");
1467 kprintf(" flags (%s)", &buf[1]);
1468 if (vp->v_data == NULL) {
1477 #include <ddb/ddb.h>
1479 static int db_show_locked_vnodes(struct mount *mp, void *data);
1482 * List all of the locked vnodes in the system.
1483 * Called when debugging the kernel.
1485 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes)
1487 kprintf("Locked vnodes\n");
1488 mountlist_scan(db_show_locked_vnodes, NULL,
1489 MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
1493 db_show_locked_vnodes(struct mount *mp, void *data __unused)
1497 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
1498 if (vn_islocked(vp))
1506 * Top level filesystem related information gathering.
1508 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS);
1511 vfs_sysctl(SYSCTL_HANDLER_ARGS)
1513 int *name = (int *)arg1 - 1; /* XXX */
1514 u_int namelen = arg2 + 1; /* XXX */
1515 struct vfsconf *vfsp;
1518 #if 1 || defined(COMPAT_PRELITE2)
1519 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
1521 return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
1525 /* all sysctl names at this level are at least name and field */
1527 return (ENOTDIR); /* overloaded */
1528 if (name[0] != VFS_GENERIC) {
1529 vfsp = vfsconf_find_by_typenum(name[0]);
1531 return (EOPNOTSUPP);
1532 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1533 oldp, oldlenp, newp, newlen, p));
1537 case VFS_MAXTYPENUM:
1540 maxtypenum = vfsconf_get_maxtypenum();
1541 return (SYSCTL_OUT(req, &maxtypenum, sizeof(maxtypenum)));
1544 return (ENOTDIR); /* overloaded */
1545 vfsp = vfsconf_find_by_typenum(name[2]);
1547 return (EOPNOTSUPP);
1548 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp));
1550 return (EOPNOTSUPP);
1553 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl,
1554 "Generic filesystem");
1556 #if 1 || defined(COMPAT_PRELITE2)
1559 sysctl_ovfs_conf_iter(struct vfsconf *vfsp, void *data)
1562 struct ovfsconf ovfs;
1563 struct sysctl_req *req = (struct sysctl_req*) data;
1565 bzero(&ovfs, sizeof(ovfs));
1566 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
1567 strcpy(ovfs.vfc_name, vfsp->vfc_name);
1568 ovfs.vfc_index = vfsp->vfc_typenum;
1569 ovfs.vfc_refcount = vfsp->vfc_refcount;
1570 ovfs.vfc_flags = vfsp->vfc_flags;
1571 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
1573 return error; /* abort iteration with error code */
1575 return 0; /* continue iterating with next element */
1579 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
1581 return vfsconf_each(sysctl_ovfs_conf_iter, (void*)req);
1584 #endif /* 1 || COMPAT_PRELITE2 */
1587 * Check to see if a filesystem is mounted on a block device.
1590 vfs_mountedon(struct vnode *vp)
1594 if ((dev = vp->v_rdev) == NULL) {
1595 if (vp->v_type != VBLK)
1596 dev = get_dev(vp->v_uminor, vp->v_umajor);
1598 if (dev != NULL && dev->si_mountpoint)
1604 * Unmount all filesystems. The list is traversed in reverse order
1605 * of mounting to avoid dependencies.
1608 static int vfs_umountall_callback(struct mount *mp, void *data);
1611 vfs_unmountall(void)
1616 count = mountlist_scan(vfs_umountall_callback,
1617 NULL, MNTSCAN_REVERSE|MNTSCAN_NOBUSY);
1623 vfs_umountall_callback(struct mount *mp, void *data)
1627 error = dounmount(mp, MNT_FORCE);
1629 mountlist_remove(mp);
1630 kprintf("unmount of filesystem mounted from %s failed (",
1631 mp->mnt_stat.f_mntfromname);
1635 kprintf("%d)\n", error);
1641 * Build hash lists of net addresses and hang them off the mount point.
1642 * Called by ufs_mount() to set up the lists of export addresses.
1645 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1646 const struct export_args *argp)
1649 struct radix_node_head *rnh;
1651 struct radix_node *rn;
1652 struct sockaddr *saddr, *smask = 0;
1656 if (argp->ex_addrlen == 0) {
1657 if (mp->mnt_flag & MNT_DEFEXPORTED)
1659 np = &nep->ne_defexported;
1660 np->netc_exflags = argp->ex_flags;
1661 np->netc_anon = argp->ex_anon;
1662 np->netc_anon.cr_ref = 1;
1663 mp->mnt_flag |= MNT_DEFEXPORTED;
1667 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN)
1669 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN)
1672 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1673 np = (struct netcred *) kmalloc(i, M_NETADDR, M_WAITOK | M_ZERO);
1674 saddr = (struct sockaddr *) (np + 1);
1675 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
1677 if (saddr->sa_len > argp->ex_addrlen)
1678 saddr->sa_len = argp->ex_addrlen;
1679 if (argp->ex_masklen) {
1680 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1681 error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
1684 if (smask->sa_len > argp->ex_masklen)
1685 smask->sa_len = argp->ex_masklen;
1687 i = saddr->sa_family;
1688 if ((rnh = nep->ne_rtable[i]) == 0) {
1690 * Seems silly to initialize every AF when most are not used,
1691 * do so on demand here
1693 SLIST_FOREACH(dom, &domains, dom_next)
1694 if (dom->dom_family == i && dom->dom_rtattach) {
1695 dom->dom_rtattach((void **) &nep->ne_rtable[i],
1699 if ((rnh = nep->ne_rtable[i]) == 0) {
1704 rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh,
1706 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */
1710 np->netc_exflags = argp->ex_flags;
1711 np->netc_anon = argp->ex_anon;
1712 np->netc_anon.cr_ref = 1;
1715 kfree(np, M_NETADDR);
1721 vfs_free_netcred(struct radix_node *rn, void *w)
1723 struct radix_node_head *rnh = (struct radix_node_head *) w;
1725 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
1726 kfree((caddr_t) rn, M_NETADDR);
1731 * Free the net address hash lists that are hanging off the mount points.
1734 vfs_free_addrlist(struct netexport *nep)
1737 struct radix_node_head *rnh;
1739 for (i = 0; i <= AF_MAX; i++)
1740 if ((rnh = nep->ne_rtable[i])) {
1741 (*rnh->rnh_walktree) (rnh, vfs_free_netcred,
1743 kfree((caddr_t) rnh, M_RTABLE);
1744 nep->ne_rtable[i] = 0;
1749 vfs_export(struct mount *mp, struct netexport *nep,
1750 const struct export_args *argp)
1754 if (argp->ex_flags & MNT_DELEXPORT) {
1755 if (mp->mnt_flag & MNT_EXPUBLIC) {
1756 vfs_setpublicfs(NULL, NULL, NULL);
1757 mp->mnt_flag &= ~MNT_EXPUBLIC;
1759 vfs_free_addrlist(nep);
1760 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
1762 if (argp->ex_flags & MNT_EXPORTED) {
1763 if (argp->ex_flags & MNT_EXPUBLIC) {
1764 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
1766 mp->mnt_flag |= MNT_EXPUBLIC;
1768 if ((error = vfs_hang_addrlist(mp, nep, argp)))
1770 mp->mnt_flag |= MNT_EXPORTED;
1777 * Set the publicly exported filesystem (WebNFS). Currently, only
1778 * one public filesystem is possible in the spec (RFC 2054 and 2055)
1781 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
1782 const struct export_args *argp)
1789 * mp == NULL -> invalidate the current info, the FS is
1790 * no longer exported. May be called from either vfs_export
1791 * or unmount, so check if it hasn't already been done.
1794 if (nfs_pub.np_valid) {
1795 nfs_pub.np_valid = 0;
1796 if (nfs_pub.np_index != NULL) {
1797 FREE(nfs_pub.np_index, M_TEMP);
1798 nfs_pub.np_index = NULL;
1805 * Only one allowed at a time.
1807 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
1811 * Get real filehandle for root of exported FS.
1813 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
1814 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
1816 if ((error = VFS_ROOT(mp, &rvp)))
1819 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
1825 * If an indexfile was specified, pull it in.
1827 if (argp->ex_indexfile != NULL) {
1830 error = vn_get_namelen(rvp, &namelen);
1833 MALLOC(nfs_pub.np_index, char *, namelen, M_TEMP,
1835 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
1839 * Check for illegal filenames.
1841 for (cp = nfs_pub.np_index; *cp; cp++) {
1849 FREE(nfs_pub.np_index, M_TEMP);
1854 nfs_pub.np_mount = mp;
1855 nfs_pub.np_valid = 1;
1860 vfs_export_lookup(struct mount *mp, struct netexport *nep,
1861 struct sockaddr *nam)
1864 struct radix_node_head *rnh;
1865 struct sockaddr *saddr;
1868 if (mp->mnt_flag & MNT_EXPORTED) {
1870 * Lookup in the export list first.
1874 rnh = nep->ne_rtable[saddr->sa_family];
1876 np = (struct netcred *)
1877 (*rnh->rnh_matchaddr)((char *)saddr,
1879 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
1884 * If no address match, use the default if it exists.
1886 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
1887 np = &nep->ne_defexported;
1893 * perform msync on all vnodes under a mount point. The mount point must
1894 * be locked. This code is also responsible for lazy-freeing unreferenced
1895 * vnodes whos VM objects no longer contain pages.
1897 * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state.
1899 * NOTE: XXX VOP_PUTPAGES and friends requires that the vnode be locked,
1900 * but vnode_pager_putpages() doesn't lock the vnode. We have to do it
1901 * way up in this high level function.
1903 static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data);
1904 static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data);
1907 vfs_msync(struct mount *mp, int flags)
1911 vmsc_flags = VMSC_GETVP;
1912 if (flags != MNT_WAIT)
1913 vmsc_flags |= VMSC_NOWAIT;
1914 vmntvnodescan(mp, vmsc_flags, vfs_msync_scan1, vfs_msync_scan2,
1919 * scan1 is a fast pre-check. There could be hundreds of thousands of
1920 * vnodes, we cannot afford to do anything heavy weight until we have a
1921 * fairly good indication that there is work to do.
1925 vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data)
1927 int flags = (int)data;
1929 if ((vp->v_flag & VRECLAIMED) == 0) {
1930 if (vshouldmsync(vp))
1931 return(0); /* call scan2 */
1932 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
1933 (vp->v_flag & VOBJDIRTY) &&
1934 (flags == MNT_WAIT || vn_islocked(vp) == 0)) {
1935 return(0); /* call scan2 */
1940 * do not call scan2, continue the loop
1946 * This callback is handed a locked vnode.
1950 vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data)
1953 int flags = (int)data;
1955 if (vp->v_flag & VRECLAIMED)
1958 if ((mp->mnt_flag & MNT_RDONLY) == 0 && (vp->v_flag & VOBJDIRTY)) {
1959 if ((obj = vp->v_object) != NULL) {
1960 vm_object_page_clean(obj, 0, 0,
1961 flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC);
1968 * Record a process's interest in events which might happen to
1969 * a vnode. Because poll uses the historic select-style interface
1970 * internally, this routine serves as both the ``check for any
1971 * pending events'' and the ``record my interest in future events''
1972 * functions. (These are done together, while the lock is held,
1973 * to avoid race conditions.)
1976 vn_pollrecord(struct vnode *vp, int events)
1980 KKASSERT(curthread->td_proc != NULL);
1982 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
1983 if (vp->v_pollinfo.vpi_revents & events) {
1985 * This leaves events we are not interested
1986 * in available for the other process which
1987 * which presumably had requested them
1988 * (otherwise they would never have been
1991 events &= vp->v_pollinfo.vpi_revents;
1992 vp->v_pollinfo.vpi_revents &= ~events;
1994 lwkt_reltoken(&ilock);
1997 vp->v_pollinfo.vpi_events |= events;
1998 selrecord(curthread, &vp->v_pollinfo.vpi_selinfo);
1999 lwkt_reltoken(&ilock);
2004 * Note the occurrence of an event. If the VN_POLLEVENT macro is used,
2005 * it is possible for us to miss an event due to race conditions, but
2006 * that condition is expected to be rare, so for the moment it is the
2007 * preferred interface.
2010 vn_pollevent(struct vnode *vp, int events)
2014 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2015 if (vp->v_pollinfo.vpi_events & events) {
2017 * We clear vpi_events so that we don't
2018 * call selwakeup() twice if two events are
2019 * posted before the polling process(es) is
2020 * awakened. This also ensures that we take at
2021 * most one selwakeup() if the polling process
2022 * is no longer interested. However, it does
2023 * mean that only one event can be noticed at
2024 * a time. (Perhaps we should only clear those
2025 * event bits which we note?) XXX
2027 vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */
2028 vp->v_pollinfo.vpi_revents |= events;
2029 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2031 lwkt_reltoken(&ilock);
2035 * Wake up anyone polling on vp because it is being revoked.
2036 * This depends on dead_poll() returning POLLHUP for correct
2040 vn_pollgone(struct vnode *vp)
2044 lwkt_gettoken(&ilock, &vp->v_pollinfo.vpi_token);
2045 if (vp->v_pollinfo.vpi_events) {
2046 vp->v_pollinfo.vpi_events = 0;
2047 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2049 lwkt_reltoken(&ilock);
2053 * extract the cdev_t from a VBLK or VCHR. The vnode must have been opened
2054 * (or v_rdev might be NULL).
2057 vn_todev(struct vnode *vp)
2059 if (vp->v_type != VBLK && vp->v_type != VCHR)
2061 KKASSERT(vp->v_rdev != NULL);
2062 return (vp->v_rdev);
2066 * Check if vnode represents a disk device. The vnode does not need to be
2070 vn_isdisk(struct vnode *vp, int *errp)
2074 if (vp->v_type != VCHR) {
2080 if ((dev = vp->v_rdev) == NULL)
2081 dev = get_dev(vp->v_umajor, vp->v_uminor);
2088 if (dev_is_good(dev) == 0) {
2093 if ((dev_dflags(dev) & D_DISK) == 0) {
2104 vn_get_namelen(struct vnode *vp, int *namelen)
2106 int error, retval[2];
2108 error = VOP_PATHCONF(vp, _PC_NAME_MAX, retval);
2116 vop_write_dirent(int *error, struct uio *uio, ino_t d_ino, uint8_t d_type,
2117 uint16_t d_namlen, const char *d_name)
2122 len = _DIRENT_RECLEN(d_namlen);
2123 if (len > uio->uio_resid)
2126 dp = kmalloc(len, M_TEMP, M_WAITOK | M_ZERO);
2129 dp->d_namlen = d_namlen;
2130 dp->d_type = d_type;
2131 bcopy(d_name, dp->d_name, d_namlen);
2133 *error = uiomove((caddr_t)dp, len, uio);
2141 vn_mark_atime(struct vnode *vp, struct thread *td)
2143 struct proc *p = td->td_proc;
2144 struct ucred *cred = p ? p->p_ucred : proc0.p_ucred;
2146 if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
2147 VOP_MARKATIME(vp, cred);