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
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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>
64 #include <sys/reboot.h>
65 #include <sys/socket.h>
67 #include <sys/sysctl.h>
68 #include <sys/syslog.h>
69 #include <sys/unistd.h>
70 #include <sys/vmmeter.h>
71 #include <sys/vnode.h>
73 #include <machine/limits.h>
76 #include <vm/vm_object.h>
77 #include <vm/vm_extern.h>
78 #include <vm/vm_kern.h>
80 #include <vm/vm_map.h>
81 #include <vm/vm_page.h>
82 #include <vm/vm_pager.h>
83 #include <vm/vnode_pager.h>
84 #include <vm/vm_zone.h>
87 #include <sys/thread2.h>
88 #include <sys/sysref2.h>
90 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
93 SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 0, "");
95 SYSCTL_INT(_vfs, OID_AUTO, fastdev, CTLFLAG_RW, &vfs_fastdev, 0, "");
97 enum vtype iftovt_tab[16] = {
98 VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
99 VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
101 int vttoif_tab[9] = {
102 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
103 S_IFSOCK, S_IFIFO, S_IFMT,
106 static int reassignbufcalls;
107 SYSCTL_INT(_vfs, OID_AUTO, reassignbufcalls, CTLFLAG_RW,
108 &reassignbufcalls, 0, "");
109 static int reassignbufloops;
110 SYSCTL_INT(_vfs, OID_AUTO, reassignbufloops, CTLFLAG_RW,
111 &reassignbufloops, 0, "");
112 static int reassignbufsortgood;
113 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortgood, CTLFLAG_RW,
114 &reassignbufsortgood, 0, "");
115 static int reassignbufsortbad;
116 SYSCTL_INT(_vfs, OID_AUTO, reassignbufsortbad, CTLFLAG_RW,
117 &reassignbufsortbad, 0, "");
118 static int reassignbufmethod = 1;
119 SYSCTL_INT(_vfs, OID_AUTO, reassignbufmethod, CTLFLAG_RW,
120 &reassignbufmethod, 0, "");
122 int nfs_mount_type = -1;
123 static struct lwkt_token spechash_token;
124 struct nfs_public nfs_pub; /* publicly exported FS */
127 SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW,
128 &desiredvnodes, 0, "Maximum number of vnodes");
130 static void vfs_free_addrlist (struct netexport *nep);
131 static int vfs_free_netcred (struct radix_node *rn, void *w);
132 static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep,
133 const struct export_args *argp);
136 * Red black tree functions
138 static int rb_buf_compare(struct buf *b1, struct buf *b2);
139 RB_GENERATE2(buf_rb_tree, buf, b_rbnode, rb_buf_compare, off_t, b_loffset);
140 RB_GENERATE2(buf_rb_hash, buf, b_rbhash, rb_buf_compare, off_t, b_loffset);
143 rb_buf_compare(struct buf *b1, struct buf *b2)
145 if (b1->b_loffset < b2->b_loffset)
147 if (b1->b_loffset > b2->b_loffset)
153 * Returns non-zero if the vnode is a candidate for lazy msyncing.
156 vshouldmsync(struct vnode *vp)
158 if (vp->v_auxrefs != 0 || vp->v_sysref.refcnt > 0)
159 return (0); /* other holders */
161 (vp->v_object->ref_count || vp->v_object->resident_page_count)) {
168 * Initialize the vnode management data structures.
170 * Called from vfsinit()
176 * Desiredvnodes is kern.maxvnodes. We want to scale it
177 * according to available system memory but we may also have
178 * to limit it based on available KVM, which is capped on 32 bit
181 desiredvnodes = min(maxproc + vmstats.v_page_count / 4,
183 (sizeof(struct vm_object) + sizeof(struct vnode))));
185 lwkt_token_init(&spechash_token);
189 * Knob to control the precision of file timestamps:
191 * 0 = seconds only; nanoseconds zeroed.
192 * 1 = seconds and nanoseconds, accurate within 1/HZ.
193 * 2 = seconds and nanoseconds, truncated to microseconds.
194 * >=3 = seconds and nanoseconds, maximum precision.
196 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
198 static int timestamp_precision = TSP_SEC;
199 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
200 ×tamp_precision, 0, "");
203 * Get a current timestamp.
208 vfs_timestamp(struct timespec *tsp)
212 switch (timestamp_precision) {
214 tsp->tv_sec = time_second;
222 TIMEVAL_TO_TIMESPEC(&tv, tsp);
232 * Set vnode attributes to VNOVAL
235 vattr_null(struct vattr *vap)
238 vap->va_size = VNOVAL;
239 vap->va_bytes = VNOVAL;
240 vap->va_mode = VNOVAL;
241 vap->va_nlink = VNOVAL;
242 vap->va_uid = VNOVAL;
243 vap->va_gid = VNOVAL;
244 vap->va_fsid = VNOVAL;
245 vap->va_fileid = VNOVAL;
246 vap->va_blocksize = VNOVAL;
247 vap->va_rmajor = VNOVAL;
248 vap->va_rminor = VNOVAL;
249 vap->va_atime.tv_sec = VNOVAL;
250 vap->va_atime.tv_nsec = VNOVAL;
251 vap->va_mtime.tv_sec = VNOVAL;
252 vap->va_mtime.tv_nsec = VNOVAL;
253 vap->va_ctime.tv_sec = VNOVAL;
254 vap->va_ctime.tv_nsec = VNOVAL;
255 vap->va_flags = VNOVAL;
256 vap->va_gen = VNOVAL;
258 vap->va_fsmid = VNOVAL;
259 /* va_*_uuid fields are only valid if related flags are set */
263 * Flush out and invalidate all buffers associated with a vnode.
267 static int vinvalbuf_bp(struct buf *bp, void *data);
269 struct vinvalbuf_bp_info {
277 vupdatefsmid(struct vnode *vp)
279 atomic_set_int(&vp->v_flag, VFSMID);
283 vinvalbuf(struct vnode *vp, int flags, int slpflag, int slptimeo)
285 struct vinvalbuf_bp_info info;
290 lwkt_gettoken(&vlock, &vp->v_token);
293 * If we are being asked to save, call fsync to ensure that the inode
296 if (flags & V_SAVE) {
297 error = bio_track_wait(&vp->v_track_write, slpflag, slptimeo);
300 if (!RB_EMPTY(&vp->v_rbdirty_tree)) {
301 if ((error = VOP_FSYNC(vp, MNT_WAIT, 0)) != 0)
305 * Dirty bufs may be left or generated via races
306 * in circumstances where vinvalbuf() is called on
307 * a vnode not undergoing reclamation. Only
308 * panic if we are trying to reclaim the vnode.
310 if ((vp->v_flag & VRECLAIMED) &&
311 (bio_track_active(&vp->v_track_write) ||
312 !RB_EMPTY(&vp->v_rbdirty_tree))) {
313 panic("vinvalbuf: dirty bufs");
317 info.slptimeo = slptimeo;
318 info.lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL;
319 if (slpflag & PCATCH)
320 info.lkflags |= LK_PCATCH;
325 * Flush the buffer cache until nothing is left.
327 while (!RB_EMPTY(&vp->v_rbclean_tree) ||
328 !RB_EMPTY(&vp->v_rbdirty_tree)) {
329 error = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree, NULL,
330 vinvalbuf_bp, &info);
332 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
333 vinvalbuf_bp, &info);
338 * Wait for I/O completion. We may block in the pip code so we have
342 bio_track_wait(&vp->v_track_write, 0, 0);
343 if ((object = vp->v_object) != NULL) {
344 while (object->paging_in_progress)
345 vm_object_pip_sleep(object, "vnvlbx");
347 } while (bio_track_active(&vp->v_track_write));
350 * Destroy the copy in the VM cache, too.
352 if ((object = vp->v_object) != NULL) {
353 vm_object_page_remove(object, 0, 0,
354 (flags & V_SAVE) ? TRUE : FALSE);
357 if (!RB_EMPTY(&vp->v_rbdirty_tree) || !RB_EMPTY(&vp->v_rbclean_tree))
358 panic("vinvalbuf: flush failed");
359 if (!RB_EMPTY(&vp->v_rbhash_tree))
360 panic("vinvalbuf: flush failed, buffers still present");
363 lwkt_reltoken(&vlock);
368 vinvalbuf_bp(struct buf *bp, void *data)
370 struct vinvalbuf_bp_info *info = data;
373 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
374 error = BUF_TIMELOCK(bp, info->lkflags,
375 "vinvalbuf", info->slptimeo);
385 KKASSERT(bp->b_vp == info->vp);
388 * XXX Since there are no node locks for NFS, I
389 * believe there is a slight chance that a delayed
390 * write will occur while sleeping just above, so
391 * check for it. Note that vfs_bio_awrite expects
392 * buffers to reside on a queue, while bwrite() and
395 * NOTE: NO B_LOCKED CHECK. Also no buf_checkwrite()
396 * check. This code will write out the buffer, period.
398 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
399 (info->flags & V_SAVE)) {
400 if (bp->b_vp == info->vp) {
401 if (bp->b_flags & B_CLUSTEROK) {
411 } else if (info->flags & V_SAVE) {
413 * Cannot set B_NOCACHE on a clean buffer as this will
414 * destroy the VM backing store which might actually
415 * be dirty (and unsynchronized).
418 bp->b_flags |= (B_INVAL | B_RELBUF);
422 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
429 * Truncate a file's buffer and pages to a specified length. This
430 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
433 * The vnode must be locked.
435 static int vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data);
436 static int vtruncbuf_bp_trunc(struct buf *bp, void *data);
437 static int vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data);
438 static int vtruncbuf_bp_metasync(struct buf *bp, void *data);
441 vtruncbuf(struct vnode *vp, off_t length, int blksize)
444 const char *filename;
449 * Round up to the *next* block, then destroy the buffers in question.
450 * Since we are only removing some of the buffers we must rely on the
451 * scan count to determine whether a loop is necessary.
453 if ((count = (int)(length % blksize)) != 0)
454 truncloffset = length + (blksize - count);
456 truncloffset = length;
458 lwkt_gettoken(&vlock, &vp->v_token);
460 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
461 vtruncbuf_bp_trunc_cmp,
462 vtruncbuf_bp_trunc, &truncloffset);
463 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
464 vtruncbuf_bp_trunc_cmp,
465 vtruncbuf_bp_trunc, &truncloffset);
469 * For safety, fsync any remaining metadata if the file is not being
470 * truncated to 0. Since the metadata does not represent the entire
471 * dirty list we have to rely on the hit count to ensure that we get
476 count = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
477 vtruncbuf_bp_metasync_cmp,
478 vtruncbuf_bp_metasync, vp);
483 * Clean out any left over VM backing store.
485 * It is possible to have in-progress I/O from buffers that were
486 * not part of the truncation. This should not happen if we
487 * are truncating to 0-length.
489 vnode_pager_setsize(vp, length);
490 bio_track_wait(&vp->v_track_write, 0, 0);
492 filename = TAILQ_FIRST(&vp->v_namecache) ?
493 TAILQ_FIRST(&vp->v_namecache)->nc_name : "?";
496 * Make sure no buffers were instantiated while we were trying
497 * to clean out the remaining VM pages. This could occur due
498 * to busy dirty VM pages being flushed out to disk.
501 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
502 vtruncbuf_bp_trunc_cmp,
503 vtruncbuf_bp_trunc, &truncloffset);
504 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
505 vtruncbuf_bp_trunc_cmp,
506 vtruncbuf_bp_trunc, &truncloffset);
508 kprintf("Warning: vtruncbuf(): Had to re-clean %d "
509 "left over buffers in %s\n", count, filename);
513 lwkt_reltoken(&vlock);
519 * The callback buffer is beyond the new file EOF and must be destroyed.
520 * Note that the compare function must conform to the RB_SCAN's requirements.
524 vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data)
526 if (bp->b_loffset >= *(off_t *)data)
533 vtruncbuf_bp_trunc(struct buf *bp, void *data)
536 * Do not try to use a buffer we cannot immediately lock, but sleep
537 * anyway to prevent a livelock. The code will loop until all buffers
540 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
541 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
545 bp->b_flags |= (B_INVAL | B_RELBUF | B_NOCACHE);
552 * Fsync all meta-data after truncating a file to be non-zero. Only metadata
553 * blocks (with a negative loffset) are scanned.
554 * Note that the compare function must conform to the RB_SCAN's requirements.
557 vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data)
559 if (bp->b_loffset < 0)
565 vtruncbuf_bp_metasync(struct buf *bp, void *data)
567 struct vnode *vp = data;
569 if (bp->b_flags & B_DELWRI) {
571 * Do not try to use a buffer we cannot immediately lock,
572 * but sleep anyway to prevent a livelock. The code will
573 * loop until all buffers can be acted upon.
575 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
576 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
592 * vfsync - implements a multipass fsync on a file which understands
593 * dependancies and meta-data. The passed vnode must be locked. The
594 * waitfor argument may be MNT_WAIT or MNT_NOWAIT, or MNT_LAZY.
596 * When fsyncing data asynchronously just do one consolidated pass starting
597 * with the most negative block number. This may not get all the data due
600 * When fsyncing data synchronously do a data pass, then a metadata pass,
601 * then do additional data+metadata passes to try to get all the data out.
603 static int vfsync_wait_output(struct vnode *vp,
604 int (*waitoutput)(struct vnode *, struct thread *));
605 static int vfsync_data_only_cmp(struct buf *bp, void *data);
606 static int vfsync_meta_only_cmp(struct buf *bp, void *data);
607 static int vfsync_lazy_range_cmp(struct buf *bp, void *data);
608 static int vfsync_bp(struct buf *bp, void *data);
617 int (*checkdef)(struct buf *);
621 vfsync(struct vnode *vp, int waitfor, int passes,
622 int (*checkdef)(struct buf *),
623 int (*waitoutput)(struct vnode *, struct thread *))
625 struct vfsync_info info;
629 bzero(&info, sizeof(info));
631 if ((info.checkdef = checkdef) == NULL)
634 lwkt_gettoken(&vlock, &vp->v_token);
639 * Lazy (filesystem syncer typ) Asynchronous plus limit the
640 * number of data (not meta) pages we try to flush to 1MB.
641 * A non-zero return means that lazy limit was reached.
643 info.lazylimit = 1024 * 1024;
645 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
646 vfsync_lazy_range_cmp, vfsync_bp, &info);
647 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
648 vfsync_meta_only_cmp, vfsync_bp, &info);
651 else if (!RB_EMPTY(&vp->v_rbdirty_tree))
652 vn_syncer_add_to_worklist(vp, 1);
657 * Asynchronous. Do a data-only pass and a meta-only pass.
660 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
662 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_meta_only_cmp,
668 * Synchronous. Do a data-only pass, then a meta-data+data
669 * pass, then additional integrated passes to try to get
670 * all the dependancies flushed.
672 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
674 error = vfsync_wait_output(vp, waitoutput);
676 info.skippedbufs = 0;
677 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
679 error = vfsync_wait_output(vp, waitoutput);
680 if (info.skippedbufs)
681 kprintf("Warning: vfsync skipped %d dirty bufs in pass2!\n", info.skippedbufs);
683 while (error == 0 && passes > 0 &&
684 !RB_EMPTY(&vp->v_rbdirty_tree)
687 info.synchronous = 1;
690 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
696 error = vfsync_wait_output(vp, waitoutput);
700 lwkt_reltoken(&vlock);
705 vfsync_wait_output(struct vnode *vp,
706 int (*waitoutput)(struct vnode *, struct thread *))
710 error = bio_track_wait(&vp->v_track_write, 0, 0);
712 error = waitoutput(vp, curthread);
717 vfsync_data_only_cmp(struct buf *bp, void *data)
719 if (bp->b_loffset < 0)
725 vfsync_meta_only_cmp(struct buf *bp, void *data)
727 if (bp->b_loffset < 0)
733 vfsync_lazy_range_cmp(struct buf *bp, void *data)
735 struct vfsync_info *info = data;
736 if (bp->b_loffset < info->vp->v_lazyw)
742 vfsync_bp(struct buf *bp, void *data)
744 struct vfsync_info *info = data;
745 struct vnode *vp = info->vp;
749 * if syncdeps is not set we do not try to write buffers which have
752 if (!info->synchronous && info->syncdeps == 0 && info->checkdef(bp))
756 * Ignore buffers that we cannot immediately lock. XXX
758 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
759 kprintf("Warning: vfsync_bp skipping dirty buffer %p\n", bp);
763 if ((bp->b_flags & B_DELWRI) == 0)
764 panic("vfsync_bp: buffer not dirty");
766 panic("vfsync_bp: buffer vp mismatch");
769 * B_NEEDCOMMIT (primarily used by NFS) is a state where the buffer
770 * has been written but an additional handshake with the device
771 * is required before we can dispose of the buffer. We have no idea
772 * how to do this so we have to skip these buffers.
774 if (bp->b_flags & B_NEEDCOMMIT) {
780 * Ask bioops if it is ok to sync
782 if (LIST_FIRST(&bp->b_dep) != NULL && buf_checkwrite(bp)) {
788 if (info->synchronous) {
790 * Synchronous flushing. An error may be returned.
796 * Asynchronous flushing. A negative return value simply
797 * stops the scan and is not considered an error. We use
798 * this to support limited MNT_LAZY flushes.
800 vp->v_lazyw = bp->b_loffset;
801 if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
802 info->lazycount += vfs_bio_awrite(bp);
804 info->lazycount += bp->b_bufsize;
808 if (info->lazylimit && info->lazycount >= info->lazylimit)
817 * Associate a buffer with a vnode.
822 bgetvp(struct vnode *vp, struct buf *bp)
826 KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
827 KKASSERT((bp->b_flags & (B_HASHED|B_DELWRI|B_VNCLEAN|B_VNDIRTY)) == 0);
830 * Insert onto list for new vnode.
832 lwkt_gettoken(&vlock, &vp->v_token);
833 if (buf_rb_hash_RB_INSERT(&vp->v_rbhash_tree, bp)) {
834 lwkt_reltoken(&vlock);
838 bp->b_flags |= B_HASHED;
839 bp->b_flags |= B_VNCLEAN;
840 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp))
841 panic("reassignbuf: dup lblk/clean vp %p bp %p", vp, bp);
843 lwkt_reltoken(&vlock);
848 * Disassociate a buffer from a vnode.
851 brelvp(struct buf *bp)
856 KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
859 * Delete from old vnode list, if on one.
862 lwkt_gettoken(&vlock, &vp->v_token);
863 if (bp->b_flags & (B_VNDIRTY | B_VNCLEAN)) {
864 if (bp->b_flags & B_VNDIRTY)
865 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
867 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
868 bp->b_flags &= ~(B_VNDIRTY | B_VNCLEAN);
870 if (bp->b_flags & B_HASHED) {
871 buf_rb_hash_RB_REMOVE(&vp->v_rbhash_tree, bp);
872 bp->b_flags &= ~B_HASHED;
874 if ((vp->v_flag & VONWORKLST) && RB_EMPTY(&vp->v_rbdirty_tree)) {
875 vp->v_flag &= ~VONWORKLST;
876 LIST_REMOVE(vp, v_synclist);
879 lwkt_reltoken(&vlock);
885 * Reassign the buffer to the proper clean/dirty list based on B_DELWRI.
886 * This routine is called when the state of the B_DELWRI bit is changed.
891 reassignbuf(struct buf *bp)
893 struct vnode *vp = bp->b_vp;
897 KKASSERT(vp != NULL);
901 * B_PAGING flagged buffers cannot be reassigned because their vp
902 * is not fully linked in.
904 if (bp->b_flags & B_PAGING)
905 panic("cannot reassign paging buffer");
907 lwkt_gettoken(&vlock, &vp->v_token);
908 if (bp->b_flags & B_DELWRI) {
910 * Move to the dirty list, add the vnode to the worklist
912 if (bp->b_flags & B_VNCLEAN) {
913 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
914 bp->b_flags &= ~B_VNCLEAN;
916 if ((bp->b_flags & B_VNDIRTY) == 0) {
917 if (buf_rb_tree_RB_INSERT(&vp->v_rbdirty_tree, bp)) {
918 panic("reassignbuf: dup lblk vp %p bp %p",
921 bp->b_flags |= B_VNDIRTY;
923 if ((vp->v_flag & VONWORKLST) == 0) {
924 switch (vp->v_type) {
931 vp->v_rdev->si_mountpoint != NULL) {
939 vn_syncer_add_to_worklist(vp, delay);
943 * Move to the clean list, remove the vnode from the worklist
944 * if no dirty blocks remain.
946 if (bp->b_flags & B_VNDIRTY) {
947 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
948 bp->b_flags &= ~B_VNDIRTY;
950 if ((bp->b_flags & B_VNCLEAN) == 0) {
951 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
952 panic("reassignbuf: dup lblk vp %p bp %p",
955 bp->b_flags |= B_VNCLEAN;
957 if ((vp->v_flag & VONWORKLST) &&
958 RB_EMPTY(&vp->v_rbdirty_tree)) {
959 vp->v_flag &= ~VONWORKLST;
960 LIST_REMOVE(vp, v_synclist);
963 lwkt_reltoken(&vlock);
967 * Create a vnode for a block device.
968 * Used for mounting the root file system.
970 extern struct vop_ops *devfs_vnode_dev_vops_p;
972 bdevvp(cdev_t dev, struct vnode **vpp)
982 error = getspecialvnode(VT_NON, NULL, &devfs_vnode_dev_vops_p,
993 v_associate_rdev(vp, dev);
994 vp->v_umajor = dev->si_umajor;
995 vp->v_uminor = dev->si_uminor;
1002 v_associate_rdev(struct vnode *vp, cdev_t dev)
1008 if (dev_is_good(dev) == 0)
1010 KKASSERT(vp->v_rdev == NULL);
1011 vp->v_rdev = reference_dev(dev);
1012 lwkt_gettoken(&ilock, &spechash_token);
1013 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_cdevnext);
1014 lwkt_reltoken(&ilock);
1019 v_release_rdev(struct vnode *vp)
1024 if ((dev = vp->v_rdev) != NULL) {
1025 lwkt_gettoken(&ilock, &spechash_token);
1026 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_cdevnext);
1029 lwkt_reltoken(&ilock);
1034 * Add a vnode to the alias list hung off the cdev_t. We only associate
1035 * the device number with the vnode. The actual device is not associated
1036 * until the vnode is opened (usually in spec_open()), and will be
1037 * disassociated on last close.
1040 addaliasu(struct vnode *nvp, int x, int y)
1042 if (nvp->v_type != VBLK && nvp->v_type != VCHR)
1043 panic("addaliasu on non-special vnode");
1049 * Simple call that a filesystem can make to try to get rid of a
1050 * vnode. It will fail if anyone is referencing the vnode (including
1053 * The filesystem can check whether its in-memory inode structure still
1054 * references the vp on return.
1057 vclean_unlocked(struct vnode *vp)
1060 if (sysref_isactive(&vp->v_sysref) == 0)
1066 * Disassociate a vnode from its underlying filesystem.
1068 * The vnode must be VX locked and referenced. In all normal situations
1069 * there are no active references. If vclean_vxlocked() is called while
1070 * there are active references, the vnode is being ripped out and we have
1071 * to call VOP_CLOSE() as appropriate before we can reclaim it.
1074 vclean_vxlocked(struct vnode *vp, int flags)
1081 * If the vnode has already been reclaimed we have nothing to do.
1083 if (vp->v_flag & VRECLAIMED)
1085 vp->v_flag |= VRECLAIMED;
1088 * Scrap the vfs cache
1090 while (cache_inval_vp(vp, 0) != 0) {
1091 kprintf("Warning: vnode %p clean/cache_resolution race detected\n", vp);
1092 tsleep(vp, 0, "vclninv", 2);
1096 * Check to see if the vnode is in use. If so we have to reference it
1097 * before we clean it out so that its count cannot fall to zero and
1098 * generate a race against ourselves to recycle it.
1100 active = sysref_isactive(&vp->v_sysref);
1103 * Clean out any buffers associated with the vnode and destroy its
1104 * object, if it has one.
1106 vinvalbuf(vp, V_SAVE, 0, 0);
1109 * If purging an active vnode (typically during a forced unmount
1110 * or reboot), it must be closed and deactivated before being
1111 * reclaimed. This isn't really all that safe, but what can
1114 * Note that neither of these routines unlocks the vnode.
1116 if (active && (flags & DOCLOSE)) {
1117 while ((n = vp->v_opencount) != 0) {
1118 if (vp->v_writecount)
1119 VOP_CLOSE(vp, FWRITE|FNONBLOCK);
1121 VOP_CLOSE(vp, FNONBLOCK);
1122 if (vp->v_opencount == n) {
1123 kprintf("Warning: unable to force-close"
1131 * If the vnode has not been deactivated, deactivated it. Deactivation
1132 * can create new buffers and VM pages so we have to call vinvalbuf()
1133 * again to make sure they all get flushed.
1135 * This can occur if a file with a link count of 0 needs to be
1138 if ((vp->v_flag & VINACTIVE) == 0) {
1139 vp->v_flag |= VINACTIVE;
1141 vinvalbuf(vp, V_SAVE, 0, 0);
1145 * If the vnode has an object, destroy it.
1147 if ((object = vp->v_object) != NULL) {
1148 if (object->ref_count == 0) {
1149 if ((object->flags & OBJ_DEAD) == 0)
1150 vm_object_terminate(object);
1152 vm_pager_deallocate(object);
1154 vp->v_flag &= ~VOBJBUF;
1156 KKASSERT((vp->v_flag & VOBJBUF) == 0);
1159 * Reclaim the vnode.
1161 if (VOP_RECLAIM(vp))
1162 panic("vclean: cannot reclaim");
1165 * Done with purge, notify sleepers of the grim news.
1167 vp->v_ops = &dead_vnode_vops_p;
1172 * If we are destroying an active vnode, reactivate it now that
1173 * we have reassociated it with deadfs. This prevents the system
1174 * from crashing on the vnode due to it being unexpectedly marked
1175 * as inactive or reclaimed.
1177 if (active && (flags & DOCLOSE)) {
1178 vp->v_flag &= ~(VINACTIVE|VRECLAIMED);
1183 * Eliminate all activity associated with the requested vnode
1184 * and with all vnodes aliased to the requested vnode.
1186 * The vnode must be referenced but should not be locked.
1189 vrevoke(struct vnode *vp, struct ucred *cred)
1198 * If the vnode has a device association, scrap all vnodes associated
1199 * with the device. Don't let the device disappear on us while we
1200 * are scrapping the vnodes.
1202 * The passed vp will probably show up in the list, do not VX lock
1205 * Releasing the vnode's rdev here can mess up specfs's call to
1206 * device close, so don't do it. The vnode has been disassociated
1207 * and the device will be closed after the last ref on the related
1208 * fp goes away (if not still open by e.g. the kernel).
1210 if (vp->v_type != VCHR) {
1211 error = fdrevoke(vp, DTYPE_VNODE, cred);
1214 if ((dev = vp->v_rdev) == NULL) {
1218 lwkt_gettoken(&ilock, &spechash_token);
1220 vqn = SLIST_FIRST(&dev->si_hlist);
1223 while ((vq = vqn) != NULL) {
1224 vqn = SLIST_NEXT(vqn, v_cdevnext);
1227 fdrevoke(vq, DTYPE_VNODE, cred);
1228 /*v_release_rdev(vq);*/
1231 lwkt_reltoken(&ilock);
1238 * This is called when the object underlying a vnode is being destroyed,
1239 * such as in a remove(). Try to recycle the vnode immediately if the
1240 * only active reference is our reference.
1242 * Directory vnodes in the namecache with children cannot be immediately
1243 * recycled because numerous VOP_N*() ops require them to be stable.
1246 vrecycle(struct vnode *vp)
1248 if (vp->v_sysref.refcnt <= 1) {
1249 if (cache_inval_vp_nonblock(vp))
1258 * Return the maximum I/O size allowed for strategy calls on VP.
1260 * If vp is VCHR or VBLK we dive the device, otherwise we use
1261 * the vp's mount info.
1264 vmaxiosize(struct vnode *vp)
1266 if (vp->v_type == VBLK || vp->v_type == VCHR) {
1267 return(vp->v_rdev->si_iosize_max);
1269 return(vp->v_mount->mnt_iosize_max);
1274 * Eliminate all activity associated with a vnode in preparation for reuse.
1276 * The vnode must be VX locked and refd and will remain VX locked and refd
1277 * on return. This routine may be called with the vnode in any state, as
1278 * long as it is VX locked. The vnode will be cleaned out and marked
1279 * VRECLAIMED but will not actually be reused until all existing refs and
1282 * NOTE: This routine may be called on a vnode which has not yet been
1283 * already been deactivated (VOP_INACTIVE), or on a vnode which has
1284 * already been reclaimed.
1286 * This routine is not responsible for placing us back on the freelist.
1287 * Instead, it happens automatically when the caller releases the VX lock
1288 * (assuming there aren't any other references).
1292 vgone_vxlocked(struct vnode *vp)
1295 * assert that the VX lock is held. This is an absolute requirement
1296 * now for vgone_vxlocked() to be called.
1298 KKASSERT(vp->v_lock.lk_exclusivecount == 1);
1301 * Clean out the filesystem specific data and set the VRECLAIMED
1302 * bit. Also deactivate the vnode if necessary.
1304 vclean_vxlocked(vp, DOCLOSE);
1307 * Delete from old mount point vnode list, if on one.
1309 if (vp->v_mount != NULL)
1310 insmntque(vp, NULL);
1313 * If special device, remove it from special device alias list
1314 * if it is on one. This should normally only occur if a vnode is
1315 * being revoked as the device should otherwise have been released
1318 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) {
1329 * Lookup a vnode by device number.
1331 * Returns non-zero and *vpp set to a vref'd vnode on success.
1332 * Returns zero on failure.
1335 vfinddev(cdev_t dev, enum vtype type, struct vnode **vpp)
1340 lwkt_gettoken(&ilock, &spechash_token);
1341 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1342 if (type == vp->v_type) {
1345 lwkt_reltoken(&ilock);
1349 lwkt_reltoken(&ilock);
1354 * Calculate the total number of references to a special device. This
1355 * routine may only be called for VBLK and VCHR vnodes since v_rdev is
1356 * an overloaded field. Since udev2dev can now return NULL, we have
1357 * to check for a NULL v_rdev.
1360 count_dev(cdev_t dev)
1366 if (SLIST_FIRST(&dev->si_hlist)) {
1367 lwkt_gettoken(&ilock, &spechash_token);
1368 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1369 count += vp->v_opencount;
1371 lwkt_reltoken(&ilock);
1377 vcount(struct vnode *vp)
1379 if (vp->v_rdev == NULL)
1381 return(count_dev(vp->v_rdev));
1385 * Initialize VMIO for a vnode. This routine MUST be called before a
1386 * VFS can issue buffer cache ops on a vnode. It is typically called
1387 * when a vnode is initialized from its inode.
1390 vinitvmio(struct vnode *vp, off_t filesize)
1396 if ((object = vp->v_object) == NULL) {
1397 object = vnode_pager_alloc(vp, filesize, 0, 0);
1399 * Dereference the reference we just created. This assumes
1400 * that the object is associated with the vp.
1402 object->ref_count--;
1405 if (object->flags & OBJ_DEAD) {
1407 vm_object_dead_sleep(object, "vodead");
1408 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1412 KASSERT(vp->v_object != NULL, ("vinitvmio: NULL object"));
1413 vp->v_flag |= VOBJBUF;
1419 * Print out a description of a vnode.
1421 static char *typename[] =
1422 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
1425 vprint(char *label, struct vnode *vp)
1430 kprintf("%s: %p: ", label, (void *)vp);
1432 kprintf("%p: ", (void *)vp);
1433 kprintf("type %s, sysrefs %d, writecount %d, holdcnt %d,",
1434 typename[vp->v_type],
1435 vp->v_sysref.refcnt, vp->v_writecount, vp->v_auxrefs);
1437 if (vp->v_flag & VROOT)
1438 strcat(buf, "|VROOT");
1439 if (vp->v_flag & VPFSROOT)
1440 strcat(buf, "|VPFSROOT");
1441 if (vp->v_flag & VTEXT)
1442 strcat(buf, "|VTEXT");
1443 if (vp->v_flag & VSYSTEM)
1444 strcat(buf, "|VSYSTEM");
1445 if (vp->v_flag & VFREE)
1446 strcat(buf, "|VFREE");
1447 if (vp->v_flag & VOBJBUF)
1448 strcat(buf, "|VOBJBUF");
1450 kprintf(" flags (%s)", &buf[1]);
1451 if (vp->v_data == NULL) {
1460 * Do the usual access checking.
1461 * file_mode, uid and gid are from the vnode in question,
1462 * while acc_mode and cred are from the VOP_ACCESS parameter list
1465 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
1466 mode_t acc_mode, struct ucred *cred)
1469 int error, ismember;
1472 * Super-user always gets read/write access, but execute access depends
1473 * on at least one execute bit being set.
1475 if (priv_check_cred(cred, PRIV_ROOT, 0) == 0) {
1476 if ((acc_mode & VEXEC) && type != VDIR &&
1477 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
1484 /* Otherwise, check the owner. */
1485 if (cred->cr_uid == uid) {
1486 if (acc_mode & VEXEC)
1488 if (acc_mode & VREAD)
1490 if (acc_mode & VWRITE)
1492 return ((file_mode & mask) == mask ? 0 : EACCES);
1495 /* Otherwise, check the groups. */
1496 ismember = groupmember(gid, cred);
1497 if (cred->cr_svgid == gid || ismember) {
1498 if (acc_mode & VEXEC)
1500 if (acc_mode & VREAD)
1502 if (acc_mode & VWRITE)
1504 return ((file_mode & mask) == mask ? 0 : EACCES);
1507 /* Otherwise, check everyone else. */
1508 if (acc_mode & VEXEC)
1510 if (acc_mode & VREAD)
1512 if (acc_mode & VWRITE)
1514 return ((file_mode & mask) == mask ? 0 : EACCES);
1518 #include <ddb/ddb.h>
1520 static int db_show_locked_vnodes(struct mount *mp, void *data);
1523 * List all of the locked vnodes in the system.
1524 * Called when debugging the kernel.
1526 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes)
1528 kprintf("Locked vnodes\n");
1529 mountlist_scan(db_show_locked_vnodes, NULL,
1530 MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
1534 db_show_locked_vnodes(struct mount *mp, void *data __unused)
1538 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
1539 if (vn_islocked(vp))
1547 * Top level filesystem related information gathering.
1549 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS);
1552 vfs_sysctl(SYSCTL_HANDLER_ARGS)
1554 int *name = (int *)arg1 - 1; /* XXX */
1555 u_int namelen = arg2 + 1; /* XXX */
1556 struct vfsconf *vfsp;
1559 #if 1 || defined(COMPAT_PRELITE2)
1560 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
1562 return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
1566 /* all sysctl names at this level are at least name and field */
1568 return (ENOTDIR); /* overloaded */
1569 if (name[0] != VFS_GENERIC) {
1570 vfsp = vfsconf_find_by_typenum(name[0]);
1572 return (EOPNOTSUPP);
1573 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1574 oldp, oldlenp, newp, newlen, p));
1578 case VFS_MAXTYPENUM:
1581 maxtypenum = vfsconf_get_maxtypenum();
1582 return (SYSCTL_OUT(req, &maxtypenum, sizeof(maxtypenum)));
1585 return (ENOTDIR); /* overloaded */
1586 vfsp = vfsconf_find_by_typenum(name[2]);
1588 return (EOPNOTSUPP);
1589 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp));
1591 return (EOPNOTSUPP);
1594 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl,
1595 "Generic filesystem");
1597 #if 1 || defined(COMPAT_PRELITE2)
1600 sysctl_ovfs_conf_iter(struct vfsconf *vfsp, void *data)
1603 struct ovfsconf ovfs;
1604 struct sysctl_req *req = (struct sysctl_req*) data;
1606 bzero(&ovfs, sizeof(ovfs));
1607 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
1608 strcpy(ovfs.vfc_name, vfsp->vfc_name);
1609 ovfs.vfc_index = vfsp->vfc_typenum;
1610 ovfs.vfc_refcount = vfsp->vfc_refcount;
1611 ovfs.vfc_flags = vfsp->vfc_flags;
1612 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
1614 return error; /* abort iteration with error code */
1616 return 0; /* continue iterating with next element */
1620 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
1622 return vfsconf_each(sysctl_ovfs_conf_iter, (void*)req);
1625 #endif /* 1 || COMPAT_PRELITE2 */
1628 * Check to see if a filesystem is mounted on a block device.
1631 vfs_mountedon(struct vnode *vp)
1635 if ((dev = vp->v_rdev) == NULL) {
1636 /* if (vp->v_type != VBLK)
1637 dev = get_dev(vp->v_uminor, vp->v_umajor); */
1639 if (dev != NULL && dev->si_mountpoint)
1645 * Unmount all filesystems. The list is traversed in reverse order
1646 * of mounting to avoid dependencies.
1649 static int vfs_umountall_callback(struct mount *mp, void *data);
1652 vfs_unmountall(void)
1657 count = mountlist_scan(vfs_umountall_callback,
1658 NULL, MNTSCAN_REVERSE|MNTSCAN_NOBUSY);
1664 vfs_umountall_callback(struct mount *mp, void *data)
1668 error = dounmount(mp, MNT_FORCE);
1670 mountlist_remove(mp);
1671 kprintf("unmount of filesystem mounted from %s failed (",
1672 mp->mnt_stat.f_mntfromname);
1676 kprintf("%d)\n", error);
1682 * Checks the mount flags for parameter mp and put the names comma-separated
1683 * into a string buffer buf with a size limit specified by len.
1685 * It returns the number of bytes written into buf, and (*errorp) will be
1686 * set to 0, EINVAL (if passed length is 0), or ENOSPC (supplied buffer was
1687 * not large enough). The buffer will be 0-terminated if len was not 0.
1690 vfs_flagstostr(int flags, const struct mountctl_opt *optp,
1691 char *buf, size_t len, int *errorp)
1693 static const struct mountctl_opt optnames[] = {
1694 { MNT_ASYNC, "asynchronous" },
1695 { MNT_EXPORTED, "NFS exported" },
1696 { MNT_LOCAL, "local" },
1697 { MNT_NOATIME, "noatime" },
1698 { MNT_NODEV, "nodev" },
1699 { MNT_NOEXEC, "noexec" },
1700 { MNT_NOSUID, "nosuid" },
1701 { MNT_NOSYMFOLLOW, "nosymfollow" },
1702 { MNT_QUOTA, "with-quotas" },
1703 { MNT_RDONLY, "read-only" },
1704 { MNT_SYNCHRONOUS, "synchronous" },
1705 { MNT_UNION, "union" },
1706 { MNT_NOCLUSTERR, "noclusterr" },
1707 { MNT_NOCLUSTERW, "noclusterw" },
1708 { MNT_SUIDDIR, "suiddir" },
1709 { MNT_SOFTDEP, "soft-updates" },
1710 { MNT_IGNORE, "ignore" },
1720 bleft = len - 1; /* leave room for trailing \0 */
1723 * Checks the size of the string. If it contains
1724 * any data, then we will append the new flags to
1727 actsize = strlen(buf);
1731 /* Default flags if no flags passed */
1735 if (bleft < 0) { /* degenerate case, 0-length buffer */
1740 for (; flags && optp->o_opt; ++optp) {
1741 if ((flags & optp->o_opt) == 0)
1743 optlen = strlen(optp->o_name);
1744 if (bwritten || actsize > 0) {
1749 buf[bwritten++] = ',';
1750 buf[bwritten++] = ' ';
1753 if (bleft < optlen) {
1757 bcopy(optp->o_name, buf + bwritten, optlen);
1760 flags &= ~optp->o_opt;
1764 * Space already reserved for trailing \0
1771 * Build hash lists of net addresses and hang them off the mount point.
1772 * Called by ufs_mount() to set up the lists of export addresses.
1775 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1776 const struct export_args *argp)
1779 struct radix_node_head *rnh;
1781 struct radix_node *rn;
1782 struct sockaddr *saddr, *smask = 0;
1786 if (argp->ex_addrlen == 0) {
1787 if (mp->mnt_flag & MNT_DEFEXPORTED)
1789 np = &nep->ne_defexported;
1790 np->netc_exflags = argp->ex_flags;
1791 np->netc_anon = argp->ex_anon;
1792 np->netc_anon.cr_ref = 1;
1793 mp->mnt_flag |= MNT_DEFEXPORTED;
1797 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN)
1799 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN)
1802 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1803 np = (struct netcred *) kmalloc(i, M_NETADDR, M_WAITOK | M_ZERO);
1804 saddr = (struct sockaddr *) (np + 1);
1805 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
1807 if (saddr->sa_len > argp->ex_addrlen)
1808 saddr->sa_len = argp->ex_addrlen;
1809 if (argp->ex_masklen) {
1810 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1811 error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
1814 if (smask->sa_len > argp->ex_masklen)
1815 smask->sa_len = argp->ex_masklen;
1817 i = saddr->sa_family;
1818 if ((rnh = nep->ne_rtable[i]) == 0) {
1820 * Seems silly to initialize every AF when most are not used,
1821 * do so on demand here
1823 SLIST_FOREACH(dom, &domains, dom_next)
1824 if (dom->dom_family == i && dom->dom_rtattach) {
1825 dom->dom_rtattach((void **) &nep->ne_rtable[i],
1829 if ((rnh = nep->ne_rtable[i]) == 0) {
1834 rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh,
1836 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */
1840 np->netc_exflags = argp->ex_flags;
1841 np->netc_anon = argp->ex_anon;
1842 np->netc_anon.cr_ref = 1;
1845 kfree(np, M_NETADDR);
1851 vfs_free_netcred(struct radix_node *rn, void *w)
1853 struct radix_node_head *rnh = (struct radix_node_head *) w;
1855 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
1856 kfree((caddr_t) rn, M_NETADDR);
1861 * Free the net address hash lists that are hanging off the mount points.
1864 vfs_free_addrlist(struct netexport *nep)
1867 struct radix_node_head *rnh;
1869 for (i = 0; i <= AF_MAX; i++)
1870 if ((rnh = nep->ne_rtable[i])) {
1871 (*rnh->rnh_walktree) (rnh, vfs_free_netcred,
1873 kfree((caddr_t) rnh, M_RTABLE);
1874 nep->ne_rtable[i] = 0;
1879 vfs_export(struct mount *mp, struct netexport *nep,
1880 const struct export_args *argp)
1884 if (argp->ex_flags & MNT_DELEXPORT) {
1885 if (mp->mnt_flag & MNT_EXPUBLIC) {
1886 vfs_setpublicfs(NULL, NULL, NULL);
1887 mp->mnt_flag &= ~MNT_EXPUBLIC;
1889 vfs_free_addrlist(nep);
1890 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
1892 if (argp->ex_flags & MNT_EXPORTED) {
1893 if (argp->ex_flags & MNT_EXPUBLIC) {
1894 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
1896 mp->mnt_flag |= MNT_EXPUBLIC;
1898 if ((error = vfs_hang_addrlist(mp, nep, argp)))
1900 mp->mnt_flag |= MNT_EXPORTED;
1907 * Set the publicly exported filesystem (WebNFS). Currently, only
1908 * one public filesystem is possible in the spec (RFC 2054 and 2055)
1911 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
1912 const struct export_args *argp)
1919 * mp == NULL -> invalidate the current info, the FS is
1920 * no longer exported. May be called from either vfs_export
1921 * or unmount, so check if it hasn't already been done.
1924 if (nfs_pub.np_valid) {
1925 nfs_pub.np_valid = 0;
1926 if (nfs_pub.np_index != NULL) {
1927 FREE(nfs_pub.np_index, M_TEMP);
1928 nfs_pub.np_index = NULL;
1935 * Only one allowed at a time.
1937 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
1941 * Get real filehandle for root of exported FS.
1943 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
1944 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
1946 if ((error = VFS_ROOT(mp, &rvp)))
1949 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
1955 * If an indexfile was specified, pull it in.
1957 if (argp->ex_indexfile != NULL) {
1960 error = vn_get_namelen(rvp, &namelen);
1963 MALLOC(nfs_pub.np_index, char *, namelen, M_TEMP,
1965 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
1969 * Check for illegal filenames.
1971 for (cp = nfs_pub.np_index; *cp; cp++) {
1979 FREE(nfs_pub.np_index, M_TEMP);
1984 nfs_pub.np_mount = mp;
1985 nfs_pub.np_valid = 1;
1990 vfs_export_lookup(struct mount *mp, struct netexport *nep,
1991 struct sockaddr *nam)
1994 struct radix_node_head *rnh;
1995 struct sockaddr *saddr;
1998 if (mp->mnt_flag & MNT_EXPORTED) {
2000 * Lookup in the export list first.
2004 rnh = nep->ne_rtable[saddr->sa_family];
2006 np = (struct netcred *)
2007 (*rnh->rnh_matchaddr)((char *)saddr,
2009 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
2014 * If no address match, use the default if it exists.
2016 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
2017 np = &nep->ne_defexported;
2023 * perform msync on all vnodes under a mount point. The mount point must
2024 * be locked. This code is also responsible for lazy-freeing unreferenced
2025 * vnodes whos VM objects no longer contain pages.
2027 * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state.
2029 * NOTE: XXX VOP_PUTPAGES and friends requires that the vnode be locked,
2030 * but vnode_pager_putpages() doesn't lock the vnode. We have to do it
2031 * way up in this high level function.
2033 static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data);
2034 static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data);
2037 vfs_msync(struct mount *mp, int flags)
2041 vmsc_flags = VMSC_GETVP;
2042 if (flags != MNT_WAIT)
2043 vmsc_flags |= VMSC_NOWAIT;
2044 vmntvnodescan(mp, vmsc_flags, vfs_msync_scan1, vfs_msync_scan2,
2045 (void *)(intptr_t)flags);
2049 * scan1 is a fast pre-check. There could be hundreds of thousands of
2050 * vnodes, we cannot afford to do anything heavy weight until we have a
2051 * fairly good indication that there is work to do.
2055 vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data)
2057 int flags = (int)(intptr_t)data;
2059 if ((vp->v_flag & VRECLAIMED) == 0) {
2060 if (vshouldmsync(vp))
2061 return(0); /* call scan2 */
2062 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
2063 (vp->v_flag & VOBJDIRTY) &&
2064 (flags == MNT_WAIT || vn_islocked(vp) == 0)) {
2065 return(0); /* call scan2 */
2070 * do not call scan2, continue the loop
2076 * This callback is handed a locked vnode.
2080 vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data)
2083 int flags = (int)(intptr_t)data;
2085 if (vp->v_flag & VRECLAIMED)
2088 if ((mp->mnt_flag & MNT_RDONLY) == 0 && (vp->v_flag & VOBJDIRTY)) {
2089 if ((obj = vp->v_object) != NULL) {
2090 vm_object_page_clean(obj, 0, 0,
2091 flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC);
2098 * Record a process's interest in events which might happen to
2099 * a vnode. Because poll uses the historic select-style interface
2100 * internally, this routine serves as both the ``check for any
2101 * pending events'' and the ``record my interest in future events''
2102 * functions. (These are done together, while the lock is held,
2103 * to avoid race conditions.)
2106 vn_pollrecord(struct vnode *vp, int events)
2110 KKASSERT(curthread->td_proc != NULL);
2112 lwkt_gettoken(&vlock, &vp->v_token);
2113 if (vp->v_pollinfo.vpi_revents & events) {
2115 * This leaves events we are not interested
2116 * in available for the other process which
2117 * which presumably had requested them
2118 * (otherwise they would never have been
2121 events &= vp->v_pollinfo.vpi_revents;
2122 vp->v_pollinfo.vpi_revents &= ~events;
2124 lwkt_reltoken(&vlock);
2127 vp->v_pollinfo.vpi_events |= events;
2128 selrecord(curthread, &vp->v_pollinfo.vpi_selinfo);
2129 lwkt_reltoken(&vlock);
2134 * Note the occurrence of an event. If the VN_POLLEVENT macro is used,
2135 * it is possible for us to miss an event due to race conditions, but
2136 * that condition is expected to be rare, so for the moment it is the
2137 * preferred interface.
2140 vn_pollevent(struct vnode *vp, int events)
2144 lwkt_gettoken(&vlock, &vp->v_token);
2145 if (vp->v_pollinfo.vpi_events & events) {
2147 * We clear vpi_events so that we don't
2148 * call selwakeup() twice if two events are
2149 * posted before the polling process(es) is
2150 * awakened. This also ensures that we take at
2151 * most one selwakeup() if the polling process
2152 * is no longer interested. However, it does
2153 * mean that only one event can be noticed at
2154 * a time. (Perhaps we should only clear those
2155 * event bits which we note?) XXX
2157 vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */
2158 vp->v_pollinfo.vpi_revents |= events;
2159 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2161 lwkt_reltoken(&vlock);
2165 * Wake up anyone polling on vp because it is being revoked.
2166 * This depends on dead_poll() returning POLLHUP for correct
2170 vn_pollgone(struct vnode *vp)
2174 lwkt_gettoken(&vlock, &vp->v_token);
2175 if (vp->v_pollinfo.vpi_events) {
2176 vp->v_pollinfo.vpi_events = 0;
2177 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2179 lwkt_reltoken(&vlock);
2183 * extract the cdev_t from a VBLK or VCHR. The vnode must have been opened
2184 * (or v_rdev might be NULL).
2187 vn_todev(struct vnode *vp)
2189 if (vp->v_type != VBLK && vp->v_type != VCHR)
2191 KKASSERT(vp->v_rdev != NULL);
2192 return (vp->v_rdev);
2196 * Check if vnode represents a disk device. The vnode does not need to be
2202 vn_isdisk(struct vnode *vp, int *errp)
2206 if (vp->v_type != VCHR) {
2219 if (dev_is_good(dev) == 0) {
2224 if ((dev_dflags(dev) & D_DISK) == 0) {
2235 vn_get_namelen(struct vnode *vp, int *namelen)
2238 register_t retval[2];
2240 error = VOP_PATHCONF(vp, _PC_NAME_MAX, retval);
2243 *namelen = (int)retval[0];
2248 vop_write_dirent(int *error, struct uio *uio, ino_t d_ino, uint8_t d_type,
2249 uint16_t d_namlen, const char *d_name)
2254 len = _DIRENT_RECLEN(d_namlen);
2255 if (len > uio->uio_resid)
2258 dp = kmalloc(len, M_TEMP, M_WAITOK | M_ZERO);
2261 dp->d_namlen = d_namlen;
2262 dp->d_type = d_type;
2263 bcopy(d_name, dp->d_name, d_namlen);
2265 *error = uiomove((caddr_t)dp, len, uio);
2273 vn_mark_atime(struct vnode *vp, struct thread *td)
2275 struct proc *p = td->td_proc;
2276 struct ucred *cred = p ? p->p_ucred : proc0.p_ucred;
2278 if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
2279 VOP_MARKATIME(vp, cred);