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.
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11 * modification, are permitted provided that the following conditions
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14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
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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.
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33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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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>
89 #include <sys/mplock2.h>
91 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
94 SYSCTL_INT(_debug, OID_AUTO, numvnodes, CTLFLAG_RD, &numvnodes, 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);
135 * Red black tree functions
137 static int rb_buf_compare(struct buf *b1, struct buf *b2);
138 RB_GENERATE2(buf_rb_tree, buf, b_rbnode, rb_buf_compare, off_t, b_loffset);
139 RB_GENERATE2(buf_rb_hash, buf, b_rbhash, rb_buf_compare, off_t, b_loffset);
142 rb_buf_compare(struct buf *b1, struct buf *b2)
144 if (b1->b_loffset < b2->b_loffset)
146 if (b1->b_loffset > b2->b_loffset)
152 * Returns non-zero if the vnode is a candidate for lazy msyncing.
155 vshouldmsync(struct vnode *vp)
157 if (vp->v_auxrefs != 0 || vp->v_sysref.refcnt > 0)
158 return (0); /* other holders */
160 (vp->v_object->ref_count || vp->v_object->resident_page_count)) {
167 * Initialize the vnode management data structures.
169 * Called from vfsinit()
178 * Desiredvnodes is kern.maxvnodes. We want to scale it
179 * according to available system memory but we may also have
180 * to limit it based on available KVM, which is capped on 32 bit
183 * WARNING! For machines with 64-256M of ram we have to be sure
184 * that the default limit scales down well due to HAMMER
185 * taking up significantly more memory per-vnode vs UFS.
186 * We want around ~5800 on a 128M machine.
188 factor1 = 20 * (sizeof(struct vm_object) + sizeof(struct vnode));
189 factor2 = 22 * (sizeof(struct vm_object) + sizeof(struct vnode));
191 imin((int64_t)vmstats.v_page_count * PAGE_SIZE / factor1,
193 desiredvnodes = imax(desiredvnodes, maxproc * 8);
195 lwkt_token_init(&spechash_token, 1);
199 * Knob to control the precision of file timestamps:
201 * 0 = seconds only; nanoseconds zeroed.
202 * 1 = seconds and nanoseconds, accurate within 1/HZ.
203 * 2 = seconds and nanoseconds, truncated to microseconds.
204 * >=3 = seconds and nanoseconds, maximum precision.
206 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
208 static int timestamp_precision = TSP_SEC;
209 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
210 ×tamp_precision, 0, "");
213 * Get a current timestamp.
218 vfs_timestamp(struct timespec *tsp)
222 switch (timestamp_precision) {
224 tsp->tv_sec = time_second;
232 TIMEVAL_TO_TIMESPEC(&tv, tsp);
242 * Set vnode attributes to VNOVAL
245 vattr_null(struct vattr *vap)
248 vap->va_size = VNOVAL;
249 vap->va_bytes = VNOVAL;
250 vap->va_mode = VNOVAL;
251 vap->va_nlink = VNOVAL;
252 vap->va_uid = VNOVAL;
253 vap->va_gid = VNOVAL;
254 vap->va_fsid = VNOVAL;
255 vap->va_fileid = VNOVAL;
256 vap->va_blocksize = VNOVAL;
257 vap->va_rmajor = VNOVAL;
258 vap->va_rminor = VNOVAL;
259 vap->va_atime.tv_sec = VNOVAL;
260 vap->va_atime.tv_nsec = VNOVAL;
261 vap->va_mtime.tv_sec = VNOVAL;
262 vap->va_mtime.tv_nsec = VNOVAL;
263 vap->va_ctime.tv_sec = VNOVAL;
264 vap->va_ctime.tv_nsec = VNOVAL;
265 vap->va_flags = VNOVAL;
266 vap->va_gen = VNOVAL;
268 /* va_*_uuid fields are only valid if related flags are set */
272 * Flush out and invalidate all buffers associated with a vnode.
276 static int vinvalbuf_bp(struct buf *bp, void *data);
278 struct vinvalbuf_bp_info {
286 vinvalbuf(struct vnode *vp, int flags, int slpflag, int slptimeo)
288 struct vinvalbuf_bp_info info;
292 lwkt_gettoken(&vp->v_token);
295 * If we are being asked to save, call fsync to ensure that the inode
298 if (flags & V_SAVE) {
299 error = bio_track_wait(&vp->v_track_write, slpflag, slptimeo);
302 if (!RB_EMPTY(&vp->v_rbdirty_tree)) {
303 if ((error = VOP_FSYNC(vp, MNT_WAIT, 0)) != 0)
307 * Dirty bufs may be left or generated via races
308 * in circumstances where vinvalbuf() is called on
309 * a vnode not undergoing reclamation. Only
310 * panic if we are trying to reclaim the vnode.
312 if ((vp->v_flag & VRECLAIMED) &&
313 (bio_track_active(&vp->v_track_write) ||
314 !RB_EMPTY(&vp->v_rbdirty_tree))) {
315 panic("vinvalbuf: dirty bufs");
319 info.slptimeo = slptimeo;
320 info.lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL;
321 if (slpflag & PCATCH)
322 info.lkflags |= LK_PCATCH;
327 * Flush the buffer cache until nothing is left.
329 while (!RB_EMPTY(&vp->v_rbclean_tree) ||
330 !RB_EMPTY(&vp->v_rbdirty_tree)) {
331 error = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree, NULL,
332 vinvalbuf_bp, &info);
334 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
335 vinvalbuf_bp, &info);
340 * Wait for I/O completion. We may block in the pip code so we have
344 bio_track_wait(&vp->v_track_write, 0, 0);
345 if ((object = vp->v_object) != NULL) {
346 while (object->paging_in_progress)
347 vm_object_pip_sleep(object, "vnvlbx");
349 } while (bio_track_active(&vp->v_track_write));
352 * Destroy the copy in the VM cache, too.
354 if ((object = vp->v_object) != NULL) {
355 vm_object_page_remove(object, 0, 0,
356 (flags & V_SAVE) ? TRUE : FALSE);
359 if (!RB_EMPTY(&vp->v_rbdirty_tree) || !RB_EMPTY(&vp->v_rbclean_tree))
360 panic("vinvalbuf: flush failed");
361 if (!RB_EMPTY(&vp->v_rbhash_tree))
362 panic("vinvalbuf: flush failed, buffers still present");
365 lwkt_reltoken(&vp->v_token);
370 vinvalbuf_bp(struct buf *bp, void *data)
372 struct vinvalbuf_bp_info *info = data;
375 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
376 error = BUF_TIMELOCK(bp, info->lkflags,
377 "vinvalbuf", info->slptimeo);
387 KKASSERT(bp->b_vp == info->vp);
390 * XXX Since there are no node locks for NFS, I
391 * believe there is a slight chance that a delayed
392 * write will occur while sleeping just above, so
393 * check for it. Note that vfs_bio_awrite expects
394 * buffers to reside on a queue, while bwrite() and
397 * NOTE: NO B_LOCKED CHECK. Also no buf_checkwrite()
398 * check. This code will write out the buffer, period.
400 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
401 (info->flags & V_SAVE)) {
402 if (bp->b_vp == info->vp) {
403 if (bp->b_flags & B_CLUSTEROK) {
413 } else if (info->flags & V_SAVE) {
415 * Cannot set B_NOCACHE on a clean buffer as this will
416 * destroy the VM backing store which might actually
417 * be dirty (and unsynchronized).
420 bp->b_flags |= (B_INVAL | B_RELBUF);
424 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
431 * Truncate a file's buffer and pages to a specified length. This
432 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
435 * The vnode must be locked.
437 static int vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data);
438 static int vtruncbuf_bp_trunc(struct buf *bp, void *data);
439 static int vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data);
440 static int vtruncbuf_bp_metasync(struct buf *bp, void *data);
443 vtruncbuf(struct vnode *vp, off_t length, int blksize)
446 const char *filename;
450 * Round up to the *next* block, then destroy the buffers in question.
451 * Since we are only removing some of the buffers we must rely on the
452 * scan count to determine whether a loop is necessary.
454 if ((count = (int)(length % blksize)) != 0)
455 truncloffset = length + (blksize - count);
457 truncloffset = length;
459 lwkt_gettoken(&vp->v_token);
461 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
462 vtruncbuf_bp_trunc_cmp,
463 vtruncbuf_bp_trunc, &truncloffset);
464 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
465 vtruncbuf_bp_trunc_cmp,
466 vtruncbuf_bp_trunc, &truncloffset);
470 * For safety, fsync any remaining metadata if the file is not being
471 * truncated to 0. Since the metadata does not represent the entire
472 * dirty list we have to rely on the hit count to ensure that we get
477 count = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
478 vtruncbuf_bp_metasync_cmp,
479 vtruncbuf_bp_metasync, vp);
484 * Clean out any left over VM backing store.
486 * It is possible to have in-progress I/O from buffers that were
487 * not part of the truncation. This should not happen if we
488 * are truncating to 0-length.
490 vnode_pager_setsize(vp, length);
491 bio_track_wait(&vp->v_track_write, 0, 0);
496 spin_lock_wr(&vp->v_spinlock);
497 filename = TAILQ_FIRST(&vp->v_namecache) ?
498 TAILQ_FIRST(&vp->v_namecache)->nc_name : "?";
499 spin_unlock_wr(&vp->v_spinlock);
502 * Make sure no buffers were instantiated while we were trying
503 * to clean out the remaining VM pages. This could occur due
504 * to busy dirty VM pages being flushed out to disk.
507 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
508 vtruncbuf_bp_trunc_cmp,
509 vtruncbuf_bp_trunc, &truncloffset);
510 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
511 vtruncbuf_bp_trunc_cmp,
512 vtruncbuf_bp_trunc, &truncloffset);
514 kprintf("Warning: vtruncbuf(): Had to re-clean %d "
515 "left over buffers in %s\n", count, filename);
519 lwkt_reltoken(&vp->v_token);
525 * The callback buffer is beyond the new file EOF and must be destroyed.
526 * Note that the compare function must conform to the RB_SCAN's requirements.
530 vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data)
532 if (bp->b_loffset >= *(off_t *)data)
539 vtruncbuf_bp_trunc(struct buf *bp, void *data)
542 * Do not try to use a buffer we cannot immediately lock, but sleep
543 * anyway to prevent a livelock. The code will loop until all buffers
546 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
547 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
551 bp->b_flags |= (B_INVAL | B_RELBUF | B_NOCACHE);
558 * Fsync all meta-data after truncating a file to be non-zero. Only metadata
559 * blocks (with a negative loffset) are scanned.
560 * Note that the compare function must conform to the RB_SCAN's requirements.
563 vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data)
565 if (bp->b_loffset < 0)
571 vtruncbuf_bp_metasync(struct buf *bp, void *data)
573 struct vnode *vp = data;
575 if (bp->b_flags & B_DELWRI) {
577 * Do not try to use a buffer we cannot immediately lock,
578 * but sleep anyway to prevent a livelock. The code will
579 * loop until all buffers can be acted upon.
581 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
582 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
598 * vfsync - implements a multipass fsync on a file which understands
599 * dependancies and meta-data. The passed vnode must be locked. The
600 * waitfor argument may be MNT_WAIT or MNT_NOWAIT, or MNT_LAZY.
602 * When fsyncing data asynchronously just do one consolidated pass starting
603 * with the most negative block number. This may not get all the data due
606 * When fsyncing data synchronously do a data pass, then a metadata pass,
607 * then do additional data+metadata passes to try to get all the data out.
609 static int vfsync_wait_output(struct vnode *vp,
610 int (*waitoutput)(struct vnode *, struct thread *));
611 static int vfsync_data_only_cmp(struct buf *bp, void *data);
612 static int vfsync_meta_only_cmp(struct buf *bp, void *data);
613 static int vfsync_lazy_range_cmp(struct buf *bp, void *data);
614 static int vfsync_bp(struct buf *bp, void *data);
623 int (*checkdef)(struct buf *);
627 vfsync(struct vnode *vp, int waitfor, int passes,
628 int (*checkdef)(struct buf *),
629 int (*waitoutput)(struct vnode *, struct thread *))
631 struct vfsync_info info;
634 bzero(&info, sizeof(info));
636 if ((info.checkdef = checkdef) == NULL)
639 lwkt_gettoken(&vp->v_token);
644 * Lazy (filesystem syncer typ) Asynchronous plus limit the
645 * number of data (not meta) pages we try to flush to 1MB.
646 * A non-zero return means that lazy limit was reached.
648 info.lazylimit = 1024 * 1024;
650 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
651 vfsync_lazy_range_cmp, vfsync_bp, &info);
652 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
653 vfsync_meta_only_cmp, vfsync_bp, &info);
656 else if (!RB_EMPTY(&vp->v_rbdirty_tree))
657 vn_syncer_add_to_worklist(vp, 1);
662 * Asynchronous. Do a data-only pass and a meta-only pass.
665 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
667 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_meta_only_cmp,
673 * Synchronous. Do a data-only pass, then a meta-data+data
674 * pass, then additional integrated passes to try to get
675 * all the dependancies flushed.
677 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
679 error = vfsync_wait_output(vp, waitoutput);
681 info.skippedbufs = 0;
682 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
684 error = vfsync_wait_output(vp, waitoutput);
685 if (info.skippedbufs)
686 kprintf("Warning: vfsync skipped %d dirty bufs in pass2!\n", info.skippedbufs);
688 while (error == 0 && passes > 0 &&
689 !RB_EMPTY(&vp->v_rbdirty_tree)
692 info.synchronous = 1;
695 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
701 error = vfsync_wait_output(vp, waitoutput);
705 lwkt_reltoken(&vp->v_token);
710 vfsync_wait_output(struct vnode *vp,
711 int (*waitoutput)(struct vnode *, struct thread *))
715 error = bio_track_wait(&vp->v_track_write, 0, 0);
717 error = waitoutput(vp, curthread);
722 vfsync_data_only_cmp(struct buf *bp, void *data)
724 if (bp->b_loffset < 0)
730 vfsync_meta_only_cmp(struct buf *bp, void *data)
732 if (bp->b_loffset < 0)
738 vfsync_lazy_range_cmp(struct buf *bp, void *data)
740 struct vfsync_info *info = data;
741 if (bp->b_loffset < info->vp->v_lazyw)
747 vfsync_bp(struct buf *bp, void *data)
749 struct vfsync_info *info = data;
750 struct vnode *vp = info->vp;
754 * if syncdeps is not set we do not try to write buffers which have
757 if (!info->synchronous && info->syncdeps == 0 && info->checkdef(bp))
761 * Ignore buffers that we cannot immediately lock. XXX
763 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
764 kprintf("Warning: vfsync_bp skipping dirty buffer %p\n", bp);
768 if ((bp->b_flags & B_DELWRI) == 0)
769 panic("vfsync_bp: buffer not dirty");
771 panic("vfsync_bp: buffer vp mismatch");
774 * B_NEEDCOMMIT (primarily used by NFS) is a state where the buffer
775 * has been written but an additional handshake with the device
776 * is required before we can dispose of the buffer. We have no idea
777 * how to do this so we have to skip these buffers.
779 if (bp->b_flags & B_NEEDCOMMIT) {
785 * Ask bioops if it is ok to sync
787 if (LIST_FIRST(&bp->b_dep) != NULL && buf_checkwrite(bp)) {
793 if (info->synchronous) {
795 * Synchronous flushing. An error may be returned.
801 * Asynchronous flushing. A negative return value simply
802 * stops the scan and is not considered an error. We use
803 * this to support limited MNT_LAZY flushes.
805 vp->v_lazyw = bp->b_loffset;
806 if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
807 info->lazycount += vfs_bio_awrite(bp);
809 info->lazycount += bp->b_bufsize;
813 if (info->lazylimit && info->lazycount >= info->lazylimit)
822 * Associate a buffer with a vnode.
827 bgetvp(struct vnode *vp, struct buf *bp)
829 KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
830 KKASSERT((bp->b_flags & (B_HASHED|B_DELWRI|B_VNCLEAN|B_VNDIRTY)) == 0);
833 * Insert onto list for new vnode.
835 lwkt_gettoken(&vp->v_token);
836 if (buf_rb_hash_RB_INSERT(&vp->v_rbhash_tree, bp)) {
837 lwkt_reltoken(&vp->v_token);
841 bp->b_flags |= B_HASHED;
842 bp->b_flags |= B_VNCLEAN;
843 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp))
844 panic("reassignbuf: dup lblk/clean vp %p bp %p", vp, bp);
846 lwkt_reltoken(&vp->v_token);
851 * Disassociate a buffer from a vnode.
854 brelvp(struct buf *bp)
858 KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
861 * Delete from old vnode list, if on one.
864 lwkt_gettoken(&vp->v_token);
865 if (bp->b_flags & (B_VNDIRTY | B_VNCLEAN)) {
866 if (bp->b_flags & B_VNDIRTY)
867 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
869 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
870 bp->b_flags &= ~(B_VNDIRTY | B_VNCLEAN);
872 if (bp->b_flags & B_HASHED) {
873 buf_rb_hash_RB_REMOVE(&vp->v_rbhash_tree, bp);
874 bp->b_flags &= ~B_HASHED;
876 if ((vp->v_flag & VONWORKLST) && RB_EMPTY(&vp->v_rbdirty_tree)) {
877 vclrflags(vp, VONWORKLST);
878 LIST_REMOVE(vp, v_synclist);
881 lwkt_reltoken(&vp->v_token);
887 * Reassign the buffer to the proper clean/dirty list based on B_DELWRI.
888 * This routine is called when the state of the B_DELWRI bit is changed.
893 reassignbuf(struct buf *bp)
895 struct vnode *vp = bp->b_vp;
898 KKASSERT(vp != NULL);
902 * B_PAGING flagged buffers cannot be reassigned because their vp
903 * is not fully linked in.
905 if (bp->b_flags & B_PAGING)
906 panic("cannot reassign paging buffer");
908 lwkt_gettoken(&vp->v_token);
909 if (bp->b_flags & B_DELWRI) {
911 * Move to the dirty list, add the vnode to the worklist
913 if (bp->b_flags & B_VNCLEAN) {
914 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
915 bp->b_flags &= ~B_VNCLEAN;
917 if ((bp->b_flags & B_VNDIRTY) == 0) {
918 if (buf_rb_tree_RB_INSERT(&vp->v_rbdirty_tree, bp)) {
919 panic("reassignbuf: dup lblk vp %p bp %p",
922 bp->b_flags |= B_VNDIRTY;
924 if ((vp->v_flag & VONWORKLST) == 0) {
925 switch (vp->v_type) {
932 vp->v_rdev->si_mountpoint != NULL) {
940 vn_syncer_add_to_worklist(vp, delay);
944 * Move to the clean list, remove the vnode from the worklist
945 * if no dirty blocks remain.
947 if (bp->b_flags & B_VNDIRTY) {
948 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
949 bp->b_flags &= ~B_VNDIRTY;
951 if ((bp->b_flags & B_VNCLEAN) == 0) {
952 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
953 panic("reassignbuf: dup lblk vp %p bp %p",
956 bp->b_flags |= B_VNCLEAN;
958 if ((vp->v_flag & VONWORKLST) &&
959 RB_EMPTY(&vp->v_rbdirty_tree)) {
960 vclrflags(vp, VONWORKLST);
961 LIST_REMOVE(vp, v_synclist);
964 lwkt_reltoken(&vp->v_token);
968 * Create a vnode for a block device.
969 * Used for mounting the root file system.
971 extern struct vop_ops *devfs_vnode_dev_vops_p;
973 bdevvp(cdev_t dev, struct vnode **vpp)
983 error = getspecialvnode(VT_NON, NULL, &devfs_vnode_dev_vops_p,
994 v_associate_rdev(vp, dev);
995 vp->v_umajor = dev->si_umajor;
996 vp->v_uminor = dev->si_uminor;
1003 v_associate_rdev(struct vnode *vp, cdev_t dev)
1007 if (dev_is_good(dev) == 0)
1009 KKASSERT(vp->v_rdev == NULL);
1010 vp->v_rdev = reference_dev(dev);
1011 lwkt_gettoken(&spechash_token);
1012 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_cdevnext);
1013 lwkt_reltoken(&spechash_token);
1018 v_release_rdev(struct vnode *vp)
1022 if ((dev = vp->v_rdev) != NULL) {
1023 lwkt_gettoken(&spechash_token);
1024 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_cdevnext);
1027 lwkt_reltoken(&spechash_token);
1032 * Add a vnode to the alias list hung off the cdev_t. We only associate
1033 * the device number with the vnode. The actual device is not associated
1034 * until the vnode is opened (usually in spec_open()), and will be
1035 * disassociated on last close.
1038 addaliasu(struct vnode *nvp, int x, int y)
1040 if (nvp->v_type != VBLK && nvp->v_type != VCHR)
1041 panic("addaliasu on non-special vnode");
1047 * Simple call that a filesystem can make to try to get rid of a
1048 * vnode. It will fail if anyone is referencing the vnode (including
1051 * The filesystem can check whether its in-memory inode structure still
1052 * references the vp on return.
1055 vclean_unlocked(struct vnode *vp)
1058 if (sysref_isactive(&vp->v_sysref) == 0)
1064 * Disassociate a vnode from its underlying filesystem.
1066 * The vnode must be VX locked and referenced. In all normal situations
1067 * there are no active references. If vclean_vxlocked() is called while
1068 * there are active references, the vnode is being ripped out and we have
1069 * to call VOP_CLOSE() as appropriate before we can reclaim it.
1072 vclean_vxlocked(struct vnode *vp, int flags)
1079 * If the vnode has already been reclaimed we have nothing to do.
1081 if (vp->v_flag & VRECLAIMED)
1083 vsetflags(vp, VRECLAIMED);
1086 * Scrap the vfs cache
1088 while (cache_inval_vp(vp, 0) != 0) {
1089 kprintf("Warning: vnode %p clean/cache_resolution race detected\n", vp);
1090 tsleep(vp, 0, "vclninv", 2);
1094 * Check to see if the vnode is in use. If so we have to reference it
1095 * before we clean it out so that its count cannot fall to zero and
1096 * generate a race against ourselves to recycle it.
1098 active = sysref_isactive(&vp->v_sysref);
1101 * Clean out any buffers associated with the vnode and destroy its
1102 * object, if it has one.
1104 vinvalbuf(vp, V_SAVE, 0, 0);
1107 * If purging an active vnode (typically during a forced unmount
1108 * or reboot), it must be closed and deactivated before being
1109 * reclaimed. This isn't really all that safe, but what can
1112 * Note that neither of these routines unlocks the vnode.
1114 if (active && (flags & DOCLOSE)) {
1115 while ((n = vp->v_opencount) != 0) {
1116 if (vp->v_writecount)
1117 VOP_CLOSE(vp, FWRITE|FNONBLOCK);
1119 VOP_CLOSE(vp, FNONBLOCK);
1120 if (vp->v_opencount == n) {
1121 kprintf("Warning: unable to force-close"
1129 * If the vnode has not been deactivated, deactivated it. Deactivation
1130 * can create new buffers and VM pages so we have to call vinvalbuf()
1131 * again to make sure they all get flushed.
1133 * This can occur if a file with a link count of 0 needs to be
1136 * If the vnode is already dead don't try to deactivate it.
1138 if ((vp->v_flag & VINACTIVE) == 0) {
1139 vsetflags(vp, VINACTIVE);
1142 vinvalbuf(vp, V_SAVE, 0, 0);
1146 * If the vnode has an object, destroy it.
1148 if ((object = vp->v_object) != NULL) {
1149 lwkt_gettoken(&vm_token);
1150 KKASSERT(object == vp->v_object);
1151 if (object->ref_count == 0) {
1152 if ((object->flags & OBJ_DEAD) == 0)
1153 vm_object_terminate(object);
1155 vm_pager_deallocate(object);
1157 vclrflags(vp, VOBJBUF);
1158 lwkt_reltoken(&vm_token);
1160 KKASSERT((vp->v_flag & VOBJBUF) == 0);
1163 * Reclaim the vnode if not already dead.
1165 if (vp->v_mount && VOP_RECLAIM(vp))
1166 panic("vclean: cannot reclaim");
1169 * Done with purge, notify sleepers of the grim news.
1171 vp->v_ops = &dead_vnode_vops_p;
1176 * If we are destroying an active vnode, reactivate it now that
1177 * we have reassociated it with deadfs. This prevents the system
1178 * from crashing on the vnode due to it being unexpectedly marked
1179 * as inactive or reclaimed.
1181 if (active && (flags & DOCLOSE)) {
1182 vclrflags(vp, VINACTIVE | VRECLAIMED);
1187 * Eliminate all activity associated with the requested vnode
1188 * and with all vnodes aliased to the requested vnode.
1190 * The vnode must be referenced but should not be locked.
1193 vrevoke(struct vnode *vp, struct ucred *cred)
1201 * If the vnode has a device association, scrap all vnodes associated
1202 * with the device. Don't let the device disappear on us while we
1203 * are scrapping the vnodes.
1205 * The passed vp will probably show up in the list, do not VX lock
1208 * Releasing the vnode's rdev here can mess up specfs's call to
1209 * device close, so don't do it. The vnode has been disassociated
1210 * and the device will be closed after the last ref on the related
1211 * fp goes away (if not still open by e.g. the kernel).
1213 if (vp->v_type != VCHR) {
1214 error = fdrevoke(vp, DTYPE_VNODE, cred);
1217 if ((dev = vp->v_rdev) == NULL) {
1221 lwkt_gettoken(&spechash_token);
1223 vqn = SLIST_FIRST(&dev->si_hlist);
1226 while ((vq = vqn) != NULL) {
1227 vqn = SLIST_NEXT(vqn, v_cdevnext);
1230 fdrevoke(vq, DTYPE_VNODE, cred);
1231 /*v_release_rdev(vq);*/
1234 lwkt_reltoken(&spechash_token);
1241 * This is called when the object underlying a vnode is being destroyed,
1242 * such as in a remove(). Try to recycle the vnode immediately if the
1243 * only active reference is our reference.
1245 * Directory vnodes in the namecache with children cannot be immediately
1246 * recycled because numerous VOP_N*() ops require them to be stable.
1248 * To avoid recursive recycling from VOP_INACTIVE implemenetations this
1249 * function is a NOP if VRECLAIMED is already set.
1252 vrecycle(struct vnode *vp)
1254 if (vp->v_sysref.refcnt <= 1 && (vp->v_flag & VRECLAIMED) == 0) {
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).
1297 vgone_vxlocked(struct vnode *vp)
1300 * assert that the VX lock is held. This is an absolute requirement
1301 * now for vgone_vxlocked() to be called.
1303 KKASSERT(vp->v_lock.lk_exclusivecount == 1);
1308 * Clean out the filesystem specific data and set the VRECLAIMED
1309 * bit. Also deactivate the vnode if necessary.
1311 vclean_vxlocked(vp, DOCLOSE);
1314 * Delete from old mount point vnode list, if on one.
1316 if (vp->v_mount != NULL) {
1317 KKASSERT(vp->v_data == NULL);
1318 insmntque(vp, NULL);
1322 * If special device, remove it from special device alias list
1323 * if it is on one. This should normally only occur if a vnode is
1324 * being revoked as the device should otherwise have been released
1327 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) {
1339 * Lookup a vnode by device number.
1341 * Returns non-zero and *vpp set to a vref'd vnode on success.
1342 * Returns zero on failure.
1345 vfinddev(cdev_t dev, enum vtype type, struct vnode **vpp)
1349 lwkt_gettoken(&spechash_token);
1350 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1351 if (type == vp->v_type) {
1354 lwkt_reltoken(&spechash_token);
1358 lwkt_reltoken(&spechash_token);
1363 * Calculate the total number of references to a special device. This
1364 * routine may only be called for VBLK and VCHR vnodes since v_rdev is
1365 * an overloaded field. Since udev2dev can now return NULL, we have
1366 * to check for a NULL v_rdev.
1369 count_dev(cdev_t dev)
1374 if (SLIST_FIRST(&dev->si_hlist)) {
1375 lwkt_gettoken(&spechash_token);
1376 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1377 count += vp->v_opencount;
1379 lwkt_reltoken(&spechash_token);
1385 vcount(struct vnode *vp)
1387 if (vp->v_rdev == NULL)
1389 return(count_dev(vp->v_rdev));
1393 * Initialize VMIO for a vnode. This routine MUST be called before a
1394 * VFS can issue buffer cache ops on a vnode. It is typically called
1395 * when a vnode is initialized from its inode.
1398 vinitvmio(struct vnode *vp, off_t filesize, int blksize, int boff)
1404 if ((object = vp->v_object) == NULL) {
1405 object = vnode_pager_alloc(vp, filesize, 0, 0, blksize, boff);
1407 * Dereference the reference we just created. This assumes
1408 * that the object is associated with the vp.
1410 object->ref_count--;
1413 if (object->flags & OBJ_DEAD) {
1415 vm_object_dead_sleep(object, "vodead");
1416 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1420 KASSERT(vp->v_object != NULL, ("vinitvmio: NULL object"));
1421 vsetflags(vp, VOBJBUF);
1427 * Print out a description of a vnode.
1429 static char *typename[] =
1430 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
1433 vprint(char *label, struct vnode *vp)
1438 kprintf("%s: %p: ", label, (void *)vp);
1440 kprintf("%p: ", (void *)vp);
1441 kprintf("type %s, sysrefs %d, writecount %d, holdcnt %d,",
1442 typename[vp->v_type],
1443 vp->v_sysref.refcnt, vp->v_writecount, vp->v_auxrefs);
1445 if (vp->v_flag & VROOT)
1446 strcat(buf, "|VROOT");
1447 if (vp->v_flag & VPFSROOT)
1448 strcat(buf, "|VPFSROOT");
1449 if (vp->v_flag & VTEXT)
1450 strcat(buf, "|VTEXT");
1451 if (vp->v_flag & VSYSTEM)
1452 strcat(buf, "|VSYSTEM");
1453 if (vp->v_flag & VFREE)
1454 strcat(buf, "|VFREE");
1455 if (vp->v_flag & VOBJBUF)
1456 strcat(buf, "|VOBJBUF");
1458 kprintf(" flags (%s)", &buf[1]);
1459 if (vp->v_data == NULL) {
1468 * Do the usual access checking.
1469 * file_mode, uid and gid are from the vnode in question,
1470 * while acc_mode and cred are from the VOP_ACCESS parameter list
1473 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
1474 mode_t acc_mode, struct ucred *cred)
1480 * Super-user always gets read/write access, but execute access depends
1481 * on at least one execute bit being set.
1483 if (priv_check_cred(cred, PRIV_ROOT, 0) == 0) {
1484 if ((acc_mode & VEXEC) && type != VDIR &&
1485 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
1492 /* Otherwise, check the owner. */
1493 if (cred->cr_uid == uid) {
1494 if (acc_mode & VEXEC)
1496 if (acc_mode & VREAD)
1498 if (acc_mode & VWRITE)
1500 return ((file_mode & mask) == mask ? 0 : EACCES);
1503 /* Otherwise, check the groups. */
1504 ismember = groupmember(gid, cred);
1505 if (cred->cr_svgid == gid || ismember) {
1506 if (acc_mode & VEXEC)
1508 if (acc_mode & VREAD)
1510 if (acc_mode & VWRITE)
1512 return ((file_mode & mask) == mask ? 0 : EACCES);
1515 /* Otherwise, check everyone else. */
1516 if (acc_mode & VEXEC)
1518 if (acc_mode & VREAD)
1520 if (acc_mode & VWRITE)
1522 return ((file_mode & mask) == mask ? 0 : EACCES);
1526 #include <ddb/ddb.h>
1528 static int db_show_locked_vnodes(struct mount *mp, void *data);
1531 * List all of the locked vnodes in the system.
1532 * Called when debugging the kernel.
1534 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes)
1536 kprintf("Locked vnodes\n");
1537 mountlist_scan(db_show_locked_vnodes, NULL,
1538 MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
1542 db_show_locked_vnodes(struct mount *mp, void *data __unused)
1546 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
1547 if (vn_islocked(vp))
1555 * Top level filesystem related information gathering.
1557 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS);
1560 vfs_sysctl(SYSCTL_HANDLER_ARGS)
1562 int *name = (int *)arg1 - 1; /* XXX */
1563 u_int namelen = arg2 + 1; /* XXX */
1564 struct vfsconf *vfsp;
1567 #if 1 || defined(COMPAT_PRELITE2)
1568 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
1570 return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
1574 /* all sysctl names at this level are at least name and field */
1576 return (ENOTDIR); /* overloaded */
1577 if (name[0] != VFS_GENERIC) {
1578 vfsp = vfsconf_find_by_typenum(name[0]);
1580 return (EOPNOTSUPP);
1581 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1582 oldp, oldlenp, newp, newlen, p));
1586 case VFS_MAXTYPENUM:
1589 maxtypenum = vfsconf_get_maxtypenum();
1590 return (SYSCTL_OUT(req, &maxtypenum, sizeof(maxtypenum)));
1593 return (ENOTDIR); /* overloaded */
1594 vfsp = vfsconf_find_by_typenum(name[2]);
1596 return (EOPNOTSUPP);
1597 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp));
1599 return (EOPNOTSUPP);
1602 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl,
1603 "Generic filesystem");
1605 #if 1 || defined(COMPAT_PRELITE2)
1608 sysctl_ovfs_conf_iter(struct vfsconf *vfsp, void *data)
1611 struct ovfsconf ovfs;
1612 struct sysctl_req *req = (struct sysctl_req*) data;
1614 bzero(&ovfs, sizeof(ovfs));
1615 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
1616 strcpy(ovfs.vfc_name, vfsp->vfc_name);
1617 ovfs.vfc_index = vfsp->vfc_typenum;
1618 ovfs.vfc_refcount = vfsp->vfc_refcount;
1619 ovfs.vfc_flags = vfsp->vfc_flags;
1620 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
1622 return error; /* abort iteration with error code */
1624 return 0; /* continue iterating with next element */
1628 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
1630 return vfsconf_each(sysctl_ovfs_conf_iter, (void*)req);
1633 #endif /* 1 || COMPAT_PRELITE2 */
1636 * Check to see if a filesystem is mounted on a block device.
1639 vfs_mountedon(struct vnode *vp)
1643 if ((dev = vp->v_rdev) == NULL) {
1644 /* if (vp->v_type != VBLK)
1645 dev = get_dev(vp->v_uminor, vp->v_umajor); */
1647 if (dev != NULL && dev->si_mountpoint)
1653 * Unmount all filesystems. The list is traversed in reverse order
1654 * of mounting to avoid dependencies.
1657 static int vfs_umountall_callback(struct mount *mp, void *data);
1660 vfs_unmountall(void)
1665 count = mountlist_scan(vfs_umountall_callback,
1666 NULL, MNTSCAN_REVERSE|MNTSCAN_NOBUSY);
1672 vfs_umountall_callback(struct mount *mp, void *data)
1676 error = dounmount(mp, MNT_FORCE);
1678 mountlist_remove(mp);
1679 kprintf("unmount of filesystem mounted from %s failed (",
1680 mp->mnt_stat.f_mntfromname);
1684 kprintf("%d)\n", error);
1690 * Checks the mount flags for parameter mp and put the names comma-separated
1691 * into a string buffer buf with a size limit specified by len.
1693 * It returns the number of bytes written into buf, and (*errorp) will be
1694 * set to 0, EINVAL (if passed length is 0), or ENOSPC (supplied buffer was
1695 * not large enough). The buffer will be 0-terminated if len was not 0.
1698 vfs_flagstostr(int flags, const struct mountctl_opt *optp,
1699 char *buf, size_t len, int *errorp)
1701 static const struct mountctl_opt optnames[] = {
1702 { MNT_ASYNC, "asynchronous" },
1703 { MNT_EXPORTED, "NFS exported" },
1704 { MNT_LOCAL, "local" },
1705 { MNT_NOATIME, "noatime" },
1706 { MNT_NODEV, "nodev" },
1707 { MNT_NOEXEC, "noexec" },
1708 { MNT_NOSUID, "nosuid" },
1709 { MNT_NOSYMFOLLOW, "nosymfollow" },
1710 { MNT_QUOTA, "with-quotas" },
1711 { MNT_RDONLY, "read-only" },
1712 { MNT_SYNCHRONOUS, "synchronous" },
1713 { MNT_UNION, "union" },
1714 { MNT_NOCLUSTERR, "noclusterr" },
1715 { MNT_NOCLUSTERW, "noclusterw" },
1716 { MNT_SUIDDIR, "suiddir" },
1717 { MNT_SOFTDEP, "soft-updates" },
1718 { MNT_IGNORE, "ignore" },
1728 bleft = len - 1; /* leave room for trailing \0 */
1731 * Checks the size of the string. If it contains
1732 * any data, then we will append the new flags to
1735 actsize = strlen(buf);
1739 /* Default flags if no flags passed */
1743 if (bleft < 0) { /* degenerate case, 0-length buffer */
1748 for (; flags && optp->o_opt; ++optp) {
1749 if ((flags & optp->o_opt) == 0)
1751 optlen = strlen(optp->o_name);
1752 if (bwritten || actsize > 0) {
1757 buf[bwritten++] = ',';
1758 buf[bwritten++] = ' ';
1761 if (bleft < optlen) {
1765 bcopy(optp->o_name, buf + bwritten, optlen);
1768 flags &= ~optp->o_opt;
1772 * Space already reserved for trailing \0
1779 * Build hash lists of net addresses and hang them off the mount point.
1780 * Called by ufs_mount() to set up the lists of export addresses.
1783 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1784 const struct export_args *argp)
1787 struct radix_node_head *rnh;
1789 struct radix_node *rn;
1790 struct sockaddr *saddr, *smask = 0;
1794 if (argp->ex_addrlen == 0) {
1795 if (mp->mnt_flag & MNT_DEFEXPORTED)
1797 np = &nep->ne_defexported;
1798 np->netc_exflags = argp->ex_flags;
1799 np->netc_anon = argp->ex_anon;
1800 np->netc_anon.cr_ref = 1;
1801 mp->mnt_flag |= MNT_DEFEXPORTED;
1805 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN)
1807 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN)
1810 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1811 np = (struct netcred *) kmalloc(i, M_NETADDR, M_WAITOK | M_ZERO);
1812 saddr = (struct sockaddr *) (np + 1);
1813 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
1815 if (saddr->sa_len > argp->ex_addrlen)
1816 saddr->sa_len = argp->ex_addrlen;
1817 if (argp->ex_masklen) {
1818 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1819 error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
1822 if (smask->sa_len > argp->ex_masklen)
1823 smask->sa_len = argp->ex_masklen;
1825 i = saddr->sa_family;
1826 if ((rnh = nep->ne_rtable[i]) == 0) {
1828 * Seems silly to initialize every AF when most are not used,
1829 * do so on demand here
1831 SLIST_FOREACH(dom, &domains, dom_next)
1832 if (dom->dom_family == i && dom->dom_rtattach) {
1833 dom->dom_rtattach((void **) &nep->ne_rtable[i],
1837 if ((rnh = nep->ne_rtable[i]) == 0) {
1842 rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh,
1844 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */
1848 np->netc_exflags = argp->ex_flags;
1849 np->netc_anon = argp->ex_anon;
1850 np->netc_anon.cr_ref = 1;
1853 kfree(np, M_NETADDR);
1859 vfs_free_netcred(struct radix_node *rn, void *w)
1861 struct radix_node_head *rnh = (struct radix_node_head *) w;
1863 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
1864 kfree((caddr_t) rn, M_NETADDR);
1869 * Free the net address hash lists that are hanging off the mount points.
1872 vfs_free_addrlist(struct netexport *nep)
1875 struct radix_node_head *rnh;
1877 for (i = 0; i <= AF_MAX; i++)
1878 if ((rnh = nep->ne_rtable[i])) {
1879 (*rnh->rnh_walktree) (rnh, vfs_free_netcred,
1881 kfree((caddr_t) rnh, M_RTABLE);
1882 nep->ne_rtable[i] = 0;
1887 vfs_export(struct mount *mp, struct netexport *nep,
1888 const struct export_args *argp)
1892 if (argp->ex_flags & MNT_DELEXPORT) {
1893 if (mp->mnt_flag & MNT_EXPUBLIC) {
1894 vfs_setpublicfs(NULL, NULL, NULL);
1895 mp->mnt_flag &= ~MNT_EXPUBLIC;
1897 vfs_free_addrlist(nep);
1898 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
1900 if (argp->ex_flags & MNT_EXPORTED) {
1901 if (argp->ex_flags & MNT_EXPUBLIC) {
1902 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
1904 mp->mnt_flag |= MNT_EXPUBLIC;
1906 if ((error = vfs_hang_addrlist(mp, nep, argp)))
1908 mp->mnt_flag |= MNT_EXPORTED;
1915 * Set the publicly exported filesystem (WebNFS). Currently, only
1916 * one public filesystem is possible in the spec (RFC 2054 and 2055)
1919 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
1920 const struct export_args *argp)
1927 * mp == NULL -> invalidate the current info, the FS is
1928 * no longer exported. May be called from either vfs_export
1929 * or unmount, so check if it hasn't already been done.
1932 if (nfs_pub.np_valid) {
1933 nfs_pub.np_valid = 0;
1934 if (nfs_pub.np_index != NULL) {
1935 FREE(nfs_pub.np_index, M_TEMP);
1936 nfs_pub.np_index = NULL;
1943 * Only one allowed at a time.
1945 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
1949 * Get real filehandle for root of exported FS.
1951 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
1952 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
1954 if ((error = VFS_ROOT(mp, &rvp)))
1957 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
1963 * If an indexfile was specified, pull it in.
1965 if (argp->ex_indexfile != NULL) {
1968 error = vn_get_namelen(rvp, &namelen);
1971 MALLOC(nfs_pub.np_index, char *, namelen, M_TEMP,
1973 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
1977 * Check for illegal filenames.
1979 for (cp = nfs_pub.np_index; *cp; cp++) {
1987 FREE(nfs_pub.np_index, M_TEMP);
1992 nfs_pub.np_mount = mp;
1993 nfs_pub.np_valid = 1;
1998 vfs_export_lookup(struct mount *mp, struct netexport *nep,
1999 struct sockaddr *nam)
2002 struct radix_node_head *rnh;
2003 struct sockaddr *saddr;
2006 if (mp->mnt_flag & MNT_EXPORTED) {
2008 * Lookup in the export list first.
2012 rnh = nep->ne_rtable[saddr->sa_family];
2014 np = (struct netcred *)
2015 (*rnh->rnh_matchaddr)((char *)saddr,
2017 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
2022 * If no address match, use the default if it exists.
2024 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
2025 np = &nep->ne_defexported;
2031 * perform msync on all vnodes under a mount point. The mount point must
2032 * be locked. This code is also responsible for lazy-freeing unreferenced
2033 * vnodes whos VM objects no longer contain pages.
2035 * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state.
2037 * NOTE: XXX VOP_PUTPAGES and friends requires that the vnode be locked,
2038 * but vnode_pager_putpages() doesn't lock the vnode. We have to do it
2039 * way up in this high level function.
2041 static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data);
2042 static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data);
2045 vfs_msync(struct mount *mp, int flags)
2050 * tmpfs sets this flag to prevent msync(), sync, and the
2051 * filesystem periodic syncer from trying to flush VM pages
2052 * to swap. Only pure memory pressure flushes tmpfs VM pages
2055 if (mp->mnt_kern_flag & MNTK_NOMSYNC)
2059 * Ok, scan the vnodes for work.
2061 vmsc_flags = VMSC_GETVP;
2062 if (flags != MNT_WAIT)
2063 vmsc_flags |= VMSC_NOWAIT;
2064 vmntvnodescan(mp, vmsc_flags, vfs_msync_scan1, vfs_msync_scan2,
2065 (void *)(intptr_t)flags);
2069 * scan1 is a fast pre-check. There could be hundreds of thousands of
2070 * vnodes, we cannot afford to do anything heavy weight until we have a
2071 * fairly good indication that there is work to do.
2075 vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data)
2077 int flags = (int)(intptr_t)data;
2079 if ((vp->v_flag & VRECLAIMED) == 0) {
2080 if (vshouldmsync(vp))
2081 return(0); /* call scan2 */
2082 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
2083 (vp->v_flag & VOBJDIRTY) &&
2084 (flags == MNT_WAIT || vn_islocked(vp) == 0)) {
2085 return(0); /* call scan2 */
2090 * do not call scan2, continue the loop
2096 * This callback is handed a locked vnode.
2100 vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data)
2103 int flags = (int)(intptr_t)data;
2105 if (vp->v_flag & VRECLAIMED)
2108 if ((mp->mnt_flag & MNT_RDONLY) == 0 && (vp->v_flag & VOBJDIRTY)) {
2109 if ((obj = vp->v_object) != NULL) {
2110 vm_object_page_clean(obj, 0, 0,
2111 flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC);
2118 * Wake up anyone interested in vp because it is being revoked.
2121 vn_gone(struct vnode *vp)
2123 lwkt_gettoken(&vp->v_token);
2124 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, NOTE_REVOKE);
2125 lwkt_reltoken(&vp->v_token);
2129 * extract the cdev_t from a VBLK or VCHR. The vnode must have been opened
2130 * (or v_rdev might be NULL).
2133 vn_todev(struct vnode *vp)
2135 if (vp->v_type != VBLK && vp->v_type != VCHR)
2137 KKASSERT(vp->v_rdev != NULL);
2138 return (vp->v_rdev);
2142 * Check if vnode represents a disk device. The vnode does not need to be
2148 vn_isdisk(struct vnode *vp, int *errp)
2152 if (vp->v_type != VCHR) {
2165 if (dev_is_good(dev) == 0) {
2170 if ((dev_dflags(dev) & D_DISK) == 0) {
2181 vn_get_namelen(struct vnode *vp, int *namelen)
2184 register_t retval[2];
2186 error = VOP_PATHCONF(vp, _PC_NAME_MAX, retval);
2189 *namelen = (int)retval[0];
2194 vop_write_dirent(int *error, struct uio *uio, ino_t d_ino, uint8_t d_type,
2195 uint16_t d_namlen, const char *d_name)
2200 len = _DIRENT_RECLEN(d_namlen);
2201 if (len > uio->uio_resid)
2204 dp = kmalloc(len, M_TEMP, M_WAITOK | M_ZERO);
2207 dp->d_namlen = d_namlen;
2208 dp->d_type = d_type;
2209 bcopy(d_name, dp->d_name, d_namlen);
2211 *error = uiomove((caddr_t)dp, len, uio);
2219 vn_mark_atime(struct vnode *vp, struct thread *td)
2221 struct proc *p = td->td_proc;
2222 struct ucred *cred = p ? p->p_ucred : proc0.p_ucred;
2224 if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
2225 VOP_MARKATIME(vp, cred);