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.
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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
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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);
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;
293 lwkt_gettoken(&vlock, &vp->v_token);
296 * If we are being asked to save, call fsync to ensure that the inode
299 if (flags & V_SAVE) {
300 error = bio_track_wait(&vp->v_track_write, slpflag, slptimeo);
303 if (!RB_EMPTY(&vp->v_rbdirty_tree)) {
304 if ((error = VOP_FSYNC(vp, MNT_WAIT, 0)) != 0)
308 * Dirty bufs may be left or generated via races
309 * in circumstances where vinvalbuf() is called on
310 * a vnode not undergoing reclamation. Only
311 * panic if we are trying to reclaim the vnode.
313 if ((vp->v_flag & VRECLAIMED) &&
314 (bio_track_active(&vp->v_track_write) ||
315 !RB_EMPTY(&vp->v_rbdirty_tree))) {
316 panic("vinvalbuf: dirty bufs");
320 info.slptimeo = slptimeo;
321 info.lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL;
322 if (slpflag & PCATCH)
323 info.lkflags |= LK_PCATCH;
328 * Flush the buffer cache until nothing is left.
330 while (!RB_EMPTY(&vp->v_rbclean_tree) ||
331 !RB_EMPTY(&vp->v_rbdirty_tree)) {
332 error = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree, NULL,
333 vinvalbuf_bp, &info);
335 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
336 vinvalbuf_bp, &info);
341 * Wait for I/O completion. We may block in the pip code so we have
345 bio_track_wait(&vp->v_track_write, 0, 0);
346 if ((object = vp->v_object) != NULL) {
347 while (object->paging_in_progress)
348 vm_object_pip_sleep(object, "vnvlbx");
350 } while (bio_track_active(&vp->v_track_write));
353 * Destroy the copy in the VM cache, too.
355 if ((object = vp->v_object) != NULL) {
356 vm_object_page_remove(object, 0, 0,
357 (flags & V_SAVE) ? TRUE : FALSE);
360 if (!RB_EMPTY(&vp->v_rbdirty_tree) || !RB_EMPTY(&vp->v_rbclean_tree))
361 panic("vinvalbuf: flush failed");
362 if (!RB_EMPTY(&vp->v_rbhash_tree))
363 panic("vinvalbuf: flush failed, buffers still present");
366 lwkt_reltoken(&vlock);
371 vinvalbuf_bp(struct buf *bp, void *data)
373 struct vinvalbuf_bp_info *info = data;
376 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
377 error = BUF_TIMELOCK(bp, info->lkflags,
378 "vinvalbuf", info->slptimeo);
388 KKASSERT(bp->b_vp == info->vp);
391 * XXX Since there are no node locks for NFS, I
392 * believe there is a slight chance that a delayed
393 * write will occur while sleeping just above, so
394 * check for it. Note that vfs_bio_awrite expects
395 * buffers to reside on a queue, while bwrite() and
398 * NOTE: NO B_LOCKED CHECK. Also no buf_checkwrite()
399 * check. This code will write out the buffer, period.
401 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
402 (info->flags & V_SAVE)) {
403 if (bp->b_vp == info->vp) {
404 if (bp->b_flags & B_CLUSTEROK) {
414 } else if (info->flags & V_SAVE) {
416 * Cannot set B_NOCACHE on a clean buffer as this will
417 * destroy the VM backing store which might actually
418 * be dirty (and unsynchronized).
421 bp->b_flags |= (B_INVAL | B_RELBUF);
425 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
432 * Truncate a file's buffer and pages to a specified length. This
433 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
436 * The vnode must be locked.
438 static int vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data);
439 static int vtruncbuf_bp_trunc(struct buf *bp, void *data);
440 static int vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data);
441 static int vtruncbuf_bp_metasync(struct buf *bp, void *data);
444 vtruncbuf(struct vnode *vp, off_t length, int blksize)
447 const char *filename;
452 * Round up to the *next* block, then destroy the buffers in question.
453 * Since we are only removing some of the buffers we must rely on the
454 * scan count to determine whether a loop is necessary.
456 if ((count = (int)(length % blksize)) != 0)
457 truncloffset = length + (blksize - count);
459 truncloffset = length;
461 lwkt_gettoken(&vlock, &vp->v_token);
463 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
464 vtruncbuf_bp_trunc_cmp,
465 vtruncbuf_bp_trunc, &truncloffset);
466 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
467 vtruncbuf_bp_trunc_cmp,
468 vtruncbuf_bp_trunc, &truncloffset);
472 * For safety, fsync any remaining metadata if the file is not being
473 * truncated to 0. Since the metadata does not represent the entire
474 * dirty list we have to rely on the hit count to ensure that we get
479 count = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
480 vtruncbuf_bp_metasync_cmp,
481 vtruncbuf_bp_metasync, vp);
486 * Clean out any left over VM backing store.
488 * It is possible to have in-progress I/O from buffers that were
489 * not part of the truncation. This should not happen if we
490 * are truncating to 0-length.
492 vnode_pager_setsize(vp, length);
493 bio_track_wait(&vp->v_track_write, 0, 0);
498 spin_lock_wr(&vp->v_spinlock);
499 filename = TAILQ_FIRST(&vp->v_namecache) ?
500 TAILQ_FIRST(&vp->v_namecache)->nc_name : "?";
501 spin_unlock_wr(&vp->v_spinlock);
504 * Make sure no buffers were instantiated while we were trying
505 * to clean out the remaining VM pages. This could occur due
506 * to busy dirty VM pages being flushed out to disk.
509 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
510 vtruncbuf_bp_trunc_cmp,
511 vtruncbuf_bp_trunc, &truncloffset);
512 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
513 vtruncbuf_bp_trunc_cmp,
514 vtruncbuf_bp_trunc, &truncloffset);
516 kprintf("Warning: vtruncbuf(): Had to re-clean %d "
517 "left over buffers in %s\n", count, filename);
521 lwkt_reltoken(&vlock);
527 * The callback buffer is beyond the new file EOF and must be destroyed.
528 * Note that the compare function must conform to the RB_SCAN's requirements.
532 vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data)
534 if (bp->b_loffset >= *(off_t *)data)
541 vtruncbuf_bp_trunc(struct buf *bp, void *data)
544 * Do not try to use a buffer we cannot immediately lock, but sleep
545 * anyway to prevent a livelock. The code will loop until all buffers
548 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
549 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
553 bp->b_flags |= (B_INVAL | B_RELBUF | B_NOCACHE);
560 * Fsync all meta-data after truncating a file to be non-zero. Only metadata
561 * blocks (with a negative loffset) are scanned.
562 * Note that the compare function must conform to the RB_SCAN's requirements.
565 vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data)
567 if (bp->b_loffset < 0)
573 vtruncbuf_bp_metasync(struct buf *bp, void *data)
575 struct vnode *vp = data;
577 if (bp->b_flags & B_DELWRI) {
579 * Do not try to use a buffer we cannot immediately lock,
580 * but sleep anyway to prevent a livelock. The code will
581 * loop until all buffers can be acted upon.
583 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
584 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
600 * vfsync - implements a multipass fsync on a file which understands
601 * dependancies and meta-data. The passed vnode must be locked. The
602 * waitfor argument may be MNT_WAIT or MNT_NOWAIT, or MNT_LAZY.
604 * When fsyncing data asynchronously just do one consolidated pass starting
605 * with the most negative block number. This may not get all the data due
608 * When fsyncing data synchronously do a data pass, then a metadata pass,
609 * then do additional data+metadata passes to try to get all the data out.
611 static int vfsync_wait_output(struct vnode *vp,
612 int (*waitoutput)(struct vnode *, struct thread *));
613 static int vfsync_data_only_cmp(struct buf *bp, void *data);
614 static int vfsync_meta_only_cmp(struct buf *bp, void *data);
615 static int vfsync_lazy_range_cmp(struct buf *bp, void *data);
616 static int vfsync_bp(struct buf *bp, void *data);
625 int (*checkdef)(struct buf *);
629 vfsync(struct vnode *vp, int waitfor, int passes,
630 int (*checkdef)(struct buf *),
631 int (*waitoutput)(struct vnode *, struct thread *))
633 struct vfsync_info info;
637 bzero(&info, sizeof(info));
639 if ((info.checkdef = checkdef) == NULL)
642 lwkt_gettoken(&vlock, &vp->v_token);
647 * Lazy (filesystem syncer typ) Asynchronous plus limit the
648 * number of data (not meta) pages we try to flush to 1MB.
649 * A non-zero return means that lazy limit was reached.
651 info.lazylimit = 1024 * 1024;
653 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
654 vfsync_lazy_range_cmp, vfsync_bp, &info);
655 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
656 vfsync_meta_only_cmp, vfsync_bp, &info);
659 else if (!RB_EMPTY(&vp->v_rbdirty_tree))
660 vn_syncer_add_to_worklist(vp, 1);
665 * Asynchronous. Do a data-only pass and a meta-only pass.
668 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
670 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_meta_only_cmp,
676 * Synchronous. Do a data-only pass, then a meta-data+data
677 * pass, then additional integrated passes to try to get
678 * all the dependancies flushed.
680 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
682 error = vfsync_wait_output(vp, waitoutput);
684 info.skippedbufs = 0;
685 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
687 error = vfsync_wait_output(vp, waitoutput);
688 if (info.skippedbufs)
689 kprintf("Warning: vfsync skipped %d dirty bufs in pass2!\n", info.skippedbufs);
691 while (error == 0 && passes > 0 &&
692 !RB_EMPTY(&vp->v_rbdirty_tree)
695 info.synchronous = 1;
698 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
704 error = vfsync_wait_output(vp, waitoutput);
708 lwkt_reltoken(&vlock);
713 vfsync_wait_output(struct vnode *vp,
714 int (*waitoutput)(struct vnode *, struct thread *))
718 error = bio_track_wait(&vp->v_track_write, 0, 0);
720 error = waitoutput(vp, curthread);
725 vfsync_data_only_cmp(struct buf *bp, void *data)
727 if (bp->b_loffset < 0)
733 vfsync_meta_only_cmp(struct buf *bp, void *data)
735 if (bp->b_loffset < 0)
741 vfsync_lazy_range_cmp(struct buf *bp, void *data)
743 struct vfsync_info *info = data;
744 if (bp->b_loffset < info->vp->v_lazyw)
750 vfsync_bp(struct buf *bp, void *data)
752 struct vfsync_info *info = data;
753 struct vnode *vp = info->vp;
757 * if syncdeps is not set we do not try to write buffers which have
760 if (!info->synchronous && info->syncdeps == 0 && info->checkdef(bp))
764 * Ignore buffers that we cannot immediately lock. XXX
766 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
767 kprintf("Warning: vfsync_bp skipping dirty buffer %p\n", bp);
771 if ((bp->b_flags & B_DELWRI) == 0)
772 panic("vfsync_bp: buffer not dirty");
774 panic("vfsync_bp: buffer vp mismatch");
777 * B_NEEDCOMMIT (primarily used by NFS) is a state where the buffer
778 * has been written but an additional handshake with the device
779 * is required before we can dispose of the buffer. We have no idea
780 * how to do this so we have to skip these buffers.
782 if (bp->b_flags & B_NEEDCOMMIT) {
788 * Ask bioops if it is ok to sync
790 if (LIST_FIRST(&bp->b_dep) != NULL && buf_checkwrite(bp)) {
796 if (info->synchronous) {
798 * Synchronous flushing. An error may be returned.
804 * Asynchronous flushing. A negative return value simply
805 * stops the scan and is not considered an error. We use
806 * this to support limited MNT_LAZY flushes.
808 vp->v_lazyw = bp->b_loffset;
809 if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
810 info->lazycount += vfs_bio_awrite(bp);
812 info->lazycount += bp->b_bufsize;
816 if (info->lazylimit && info->lazycount >= info->lazylimit)
825 * Associate a buffer with a vnode.
830 bgetvp(struct vnode *vp, struct buf *bp)
834 KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
835 KKASSERT((bp->b_flags & (B_HASHED|B_DELWRI|B_VNCLEAN|B_VNDIRTY)) == 0);
838 * Insert onto list for new vnode.
840 lwkt_gettoken(&vlock, &vp->v_token);
841 if (buf_rb_hash_RB_INSERT(&vp->v_rbhash_tree, bp)) {
842 lwkt_reltoken(&vlock);
846 bp->b_flags |= B_HASHED;
847 bp->b_flags |= B_VNCLEAN;
848 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp))
849 panic("reassignbuf: dup lblk/clean vp %p bp %p", vp, bp);
851 lwkt_reltoken(&vlock);
856 * Disassociate a buffer from a vnode.
859 brelvp(struct buf *bp)
864 KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
867 * Delete from old vnode list, if on one.
870 lwkt_gettoken(&vlock, &vp->v_token);
871 if (bp->b_flags & (B_VNDIRTY | B_VNCLEAN)) {
872 if (bp->b_flags & B_VNDIRTY)
873 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
875 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
876 bp->b_flags &= ~(B_VNDIRTY | B_VNCLEAN);
878 if (bp->b_flags & B_HASHED) {
879 buf_rb_hash_RB_REMOVE(&vp->v_rbhash_tree, bp);
880 bp->b_flags &= ~B_HASHED;
882 if ((vp->v_flag & VONWORKLST) && RB_EMPTY(&vp->v_rbdirty_tree)) {
883 vclrflags(vp, VONWORKLST);
884 LIST_REMOVE(vp, v_synclist);
887 lwkt_reltoken(&vlock);
893 * Reassign the buffer to the proper clean/dirty list based on B_DELWRI.
894 * This routine is called when the state of the B_DELWRI bit is changed.
899 reassignbuf(struct buf *bp)
901 struct vnode *vp = bp->b_vp;
905 KKASSERT(vp != NULL);
909 * B_PAGING flagged buffers cannot be reassigned because their vp
910 * is not fully linked in.
912 if (bp->b_flags & B_PAGING)
913 panic("cannot reassign paging buffer");
915 lwkt_gettoken(&vlock, &vp->v_token);
916 if (bp->b_flags & B_DELWRI) {
918 * Move to the dirty list, add the vnode to the worklist
920 if (bp->b_flags & B_VNCLEAN) {
921 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
922 bp->b_flags &= ~B_VNCLEAN;
924 if ((bp->b_flags & B_VNDIRTY) == 0) {
925 if (buf_rb_tree_RB_INSERT(&vp->v_rbdirty_tree, bp)) {
926 panic("reassignbuf: dup lblk vp %p bp %p",
929 bp->b_flags |= B_VNDIRTY;
931 if ((vp->v_flag & VONWORKLST) == 0) {
932 switch (vp->v_type) {
939 vp->v_rdev->si_mountpoint != NULL) {
947 vn_syncer_add_to_worklist(vp, delay);
951 * Move to the clean list, remove the vnode from the worklist
952 * if no dirty blocks remain.
954 if (bp->b_flags & B_VNDIRTY) {
955 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
956 bp->b_flags &= ~B_VNDIRTY;
958 if ((bp->b_flags & B_VNCLEAN) == 0) {
959 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
960 panic("reassignbuf: dup lblk vp %p bp %p",
963 bp->b_flags |= B_VNCLEAN;
965 if ((vp->v_flag & VONWORKLST) &&
966 RB_EMPTY(&vp->v_rbdirty_tree)) {
967 vclrflags(vp, VONWORKLST);
968 LIST_REMOVE(vp, v_synclist);
971 lwkt_reltoken(&vlock);
975 * Create a vnode for a block device.
976 * Used for mounting the root file system.
978 extern struct vop_ops *devfs_vnode_dev_vops_p;
980 bdevvp(cdev_t dev, struct vnode **vpp)
990 error = getspecialvnode(VT_NON, NULL, &devfs_vnode_dev_vops_p,
1001 v_associate_rdev(vp, dev);
1002 vp->v_umajor = dev->si_umajor;
1003 vp->v_uminor = dev->si_uminor;
1010 v_associate_rdev(struct vnode *vp, cdev_t dev)
1016 if (dev_is_good(dev) == 0)
1018 KKASSERT(vp->v_rdev == NULL);
1019 vp->v_rdev = reference_dev(dev);
1020 lwkt_gettoken(&ilock, &spechash_token);
1021 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_cdevnext);
1022 lwkt_reltoken(&ilock);
1027 v_release_rdev(struct vnode *vp)
1032 if ((dev = vp->v_rdev) != NULL) {
1033 lwkt_gettoken(&ilock, &spechash_token);
1034 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_cdevnext);
1037 lwkt_reltoken(&ilock);
1042 * Add a vnode to the alias list hung off the cdev_t. We only associate
1043 * the device number with the vnode. The actual device is not associated
1044 * until the vnode is opened (usually in spec_open()), and will be
1045 * disassociated on last close.
1048 addaliasu(struct vnode *nvp, int x, int y)
1050 if (nvp->v_type != VBLK && nvp->v_type != VCHR)
1051 panic("addaliasu on non-special vnode");
1057 * Simple call that a filesystem can make to try to get rid of a
1058 * vnode. It will fail if anyone is referencing the vnode (including
1061 * The filesystem can check whether its in-memory inode structure still
1062 * references the vp on return.
1065 vclean_unlocked(struct vnode *vp)
1068 if (sysref_isactive(&vp->v_sysref) == 0)
1074 * Disassociate a vnode from its underlying filesystem.
1076 * The vnode must be VX locked and referenced. In all normal situations
1077 * there are no active references. If vclean_vxlocked() is called while
1078 * there are active references, the vnode is being ripped out and we have
1079 * to call VOP_CLOSE() as appropriate before we can reclaim it.
1082 vclean_vxlocked(struct vnode *vp, int flags)
1089 * If the vnode has already been reclaimed we have nothing to do.
1091 if (vp->v_flag & VRECLAIMED)
1093 vsetflags(vp, VRECLAIMED);
1096 * Scrap the vfs cache
1098 while (cache_inval_vp(vp, 0) != 0) {
1099 kprintf("Warning: vnode %p clean/cache_resolution race detected\n", vp);
1100 tsleep(vp, 0, "vclninv", 2);
1104 * Check to see if the vnode is in use. If so we have to reference it
1105 * before we clean it out so that its count cannot fall to zero and
1106 * generate a race against ourselves to recycle it.
1108 active = sysref_isactive(&vp->v_sysref);
1111 * Clean out any buffers associated with the vnode and destroy its
1112 * object, if it has one.
1114 vinvalbuf(vp, V_SAVE, 0, 0);
1117 * If purging an active vnode (typically during a forced unmount
1118 * or reboot), it must be closed and deactivated before being
1119 * reclaimed. This isn't really all that safe, but what can
1122 * Note that neither of these routines unlocks the vnode.
1124 if (active && (flags & DOCLOSE)) {
1125 while ((n = vp->v_opencount) != 0) {
1126 if (vp->v_writecount)
1127 VOP_CLOSE(vp, FWRITE|FNONBLOCK);
1129 VOP_CLOSE(vp, FNONBLOCK);
1130 if (vp->v_opencount == n) {
1131 kprintf("Warning: unable to force-close"
1139 * If the vnode has not been deactivated, deactivated it. Deactivation
1140 * can create new buffers and VM pages so we have to call vinvalbuf()
1141 * again to make sure they all get flushed.
1143 * This can occur if a file with a link count of 0 needs to be
1146 * If the vnode is already dead don't try to deactivate it.
1148 if ((vp->v_flag & VINACTIVE) == 0) {
1149 vsetflags(vp, VINACTIVE);
1152 vinvalbuf(vp, V_SAVE, 0, 0);
1156 * If the vnode has an object, destroy it.
1158 if ((object = vp->v_object) != NULL) {
1159 if (object->ref_count == 0) {
1160 if ((object->flags & OBJ_DEAD) == 0)
1161 vm_object_terminate(object);
1163 vm_pager_deallocate(object);
1165 vclrflags(vp, VOBJBUF);
1167 KKASSERT((vp->v_flag & VOBJBUF) == 0);
1170 * Reclaim the vnode if not already dead.
1172 if (vp->v_mount && VOP_RECLAIM(vp))
1173 panic("vclean: cannot reclaim");
1176 * Done with purge, notify sleepers of the grim news.
1178 vp->v_ops = &dead_vnode_vops_p;
1183 * If we are destroying an active vnode, reactivate it now that
1184 * we have reassociated it with deadfs. This prevents the system
1185 * from crashing on the vnode due to it being unexpectedly marked
1186 * as inactive or reclaimed.
1188 if (active && (flags & DOCLOSE)) {
1189 vclrflags(vp, VINACTIVE | VRECLAIMED);
1194 * Eliminate all activity associated with the requested vnode
1195 * and with all vnodes aliased to the requested vnode.
1197 * The vnode must be referenced but should not be locked.
1200 vrevoke(struct vnode *vp, struct ucred *cred)
1209 * If the vnode has a device association, scrap all vnodes associated
1210 * with the device. Don't let the device disappear on us while we
1211 * are scrapping the vnodes.
1213 * The passed vp will probably show up in the list, do not VX lock
1216 * Releasing the vnode's rdev here can mess up specfs's call to
1217 * device close, so don't do it. The vnode has been disassociated
1218 * and the device will be closed after the last ref on the related
1219 * fp goes away (if not still open by e.g. the kernel).
1221 if (vp->v_type != VCHR) {
1222 error = fdrevoke(vp, DTYPE_VNODE, cred);
1225 if ((dev = vp->v_rdev) == NULL) {
1229 lwkt_gettoken(&ilock, &spechash_token);
1231 vqn = SLIST_FIRST(&dev->si_hlist);
1234 while ((vq = vqn) != NULL) {
1235 vqn = SLIST_NEXT(vqn, v_cdevnext);
1238 fdrevoke(vq, DTYPE_VNODE, cred);
1239 /*v_release_rdev(vq);*/
1242 lwkt_reltoken(&ilock);
1249 * This is called when the object underlying a vnode is being destroyed,
1250 * such as in a remove(). Try to recycle the vnode immediately if the
1251 * only active reference is our reference.
1253 * Directory vnodes in the namecache with children cannot be immediately
1254 * recycled because numerous VOP_N*() ops require them to be stable.
1256 * To avoid recursive recycling from VOP_INACTIVE implemenetations this
1257 * function is a NOP if VRECLAIMED is already set.
1260 vrecycle(struct vnode *vp)
1262 if (vp->v_sysref.refcnt <= 1 && (vp->v_flag & VRECLAIMED) == 0) {
1263 if (cache_inval_vp_nonblock(vp))
1272 * Return the maximum I/O size allowed for strategy calls on VP.
1274 * If vp is VCHR or VBLK we dive the device, otherwise we use
1275 * the vp's mount info.
1278 vmaxiosize(struct vnode *vp)
1280 if (vp->v_type == VBLK || vp->v_type == VCHR) {
1281 return(vp->v_rdev->si_iosize_max);
1283 return(vp->v_mount->mnt_iosize_max);
1288 * Eliminate all activity associated with a vnode in preparation for reuse.
1290 * The vnode must be VX locked and refd and will remain VX locked and refd
1291 * on return. This routine may be called with the vnode in any state, as
1292 * long as it is VX locked. The vnode will be cleaned out and marked
1293 * VRECLAIMED but will not actually be reused until all existing refs and
1296 * NOTE: This routine may be called on a vnode which has not yet been
1297 * already been deactivated (VOP_INACTIVE), or on a vnode which has
1298 * already been reclaimed.
1300 * This routine is not responsible for placing us back on the freelist.
1301 * Instead, it happens automatically when the caller releases the VX lock
1302 * (assuming there aren't any other references).
1305 vgone_vxlocked(struct vnode *vp)
1308 * assert that the VX lock is held. This is an absolute requirement
1309 * now for vgone_vxlocked() to be called.
1311 KKASSERT(vp->v_lock.lk_exclusivecount == 1);
1316 * Clean out the filesystem specific data and set the VRECLAIMED
1317 * bit. Also deactivate the vnode if necessary.
1319 vclean_vxlocked(vp, DOCLOSE);
1322 * Delete from old mount point vnode list, if on one.
1324 if (vp->v_mount != NULL) {
1325 KKASSERT(vp->v_data == NULL);
1326 insmntque(vp, NULL);
1330 * If special device, remove it from special device alias list
1331 * if it is on one. This should normally only occur if a vnode is
1332 * being revoked as the device should otherwise have been released
1335 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) {
1347 * Lookup a vnode by device number.
1349 * Returns non-zero and *vpp set to a vref'd vnode on success.
1350 * Returns zero on failure.
1353 vfinddev(cdev_t dev, enum vtype type, struct vnode **vpp)
1358 lwkt_gettoken(&ilock, &spechash_token);
1359 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1360 if (type == vp->v_type) {
1363 lwkt_reltoken(&ilock);
1367 lwkt_reltoken(&ilock);
1372 * Calculate the total number of references to a special device. This
1373 * routine may only be called for VBLK and VCHR vnodes since v_rdev is
1374 * an overloaded field. Since udev2dev can now return NULL, we have
1375 * to check for a NULL v_rdev.
1378 count_dev(cdev_t dev)
1384 if (SLIST_FIRST(&dev->si_hlist)) {
1385 lwkt_gettoken(&ilock, &spechash_token);
1386 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1387 count += vp->v_opencount;
1389 lwkt_reltoken(&ilock);
1395 vcount(struct vnode *vp)
1397 if (vp->v_rdev == NULL)
1399 return(count_dev(vp->v_rdev));
1403 * Initialize VMIO for a vnode. This routine MUST be called before a
1404 * VFS can issue buffer cache ops on a vnode. It is typically called
1405 * when a vnode is initialized from its inode.
1408 vinitvmio(struct vnode *vp, off_t filesize, int blksize, int boff)
1414 if ((object = vp->v_object) == NULL) {
1415 object = vnode_pager_alloc(vp, filesize, 0, 0, blksize, boff);
1417 * Dereference the reference we just created. This assumes
1418 * that the object is associated with the vp.
1420 object->ref_count--;
1423 if (object->flags & OBJ_DEAD) {
1425 vm_object_dead_sleep(object, "vodead");
1426 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1430 KASSERT(vp->v_object != NULL, ("vinitvmio: NULL object"));
1431 vsetflags(vp, VOBJBUF);
1437 * Print out a description of a vnode.
1439 static char *typename[] =
1440 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
1443 vprint(char *label, struct vnode *vp)
1448 kprintf("%s: %p: ", label, (void *)vp);
1450 kprintf("%p: ", (void *)vp);
1451 kprintf("type %s, sysrefs %d, writecount %d, holdcnt %d,",
1452 typename[vp->v_type],
1453 vp->v_sysref.refcnt, vp->v_writecount, vp->v_auxrefs);
1455 if (vp->v_flag & VROOT)
1456 strcat(buf, "|VROOT");
1457 if (vp->v_flag & VPFSROOT)
1458 strcat(buf, "|VPFSROOT");
1459 if (vp->v_flag & VTEXT)
1460 strcat(buf, "|VTEXT");
1461 if (vp->v_flag & VSYSTEM)
1462 strcat(buf, "|VSYSTEM");
1463 if (vp->v_flag & VFREE)
1464 strcat(buf, "|VFREE");
1465 if (vp->v_flag & VOBJBUF)
1466 strcat(buf, "|VOBJBUF");
1468 kprintf(" flags (%s)", &buf[1]);
1469 if (vp->v_data == NULL) {
1478 * Do the usual access checking.
1479 * file_mode, uid and gid are from the vnode in question,
1480 * while acc_mode and cred are from the VOP_ACCESS parameter list
1483 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
1484 mode_t acc_mode, struct ucred *cred)
1490 * Super-user always gets read/write access, but execute access depends
1491 * on at least one execute bit being set.
1493 if (priv_check_cred(cred, PRIV_ROOT, 0) == 0) {
1494 if ((acc_mode & VEXEC) && type != VDIR &&
1495 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
1502 /* Otherwise, check the owner. */
1503 if (cred->cr_uid == uid) {
1504 if (acc_mode & VEXEC)
1506 if (acc_mode & VREAD)
1508 if (acc_mode & VWRITE)
1510 return ((file_mode & mask) == mask ? 0 : EACCES);
1513 /* Otherwise, check the groups. */
1514 ismember = groupmember(gid, cred);
1515 if (cred->cr_svgid == gid || ismember) {
1516 if (acc_mode & VEXEC)
1518 if (acc_mode & VREAD)
1520 if (acc_mode & VWRITE)
1522 return ((file_mode & mask) == mask ? 0 : EACCES);
1525 /* Otherwise, check everyone else. */
1526 if (acc_mode & VEXEC)
1528 if (acc_mode & VREAD)
1530 if (acc_mode & VWRITE)
1532 return ((file_mode & mask) == mask ? 0 : EACCES);
1536 #include <ddb/ddb.h>
1538 static int db_show_locked_vnodes(struct mount *mp, void *data);
1541 * List all of the locked vnodes in the system.
1542 * Called when debugging the kernel.
1544 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes)
1546 kprintf("Locked vnodes\n");
1547 mountlist_scan(db_show_locked_vnodes, NULL,
1548 MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
1552 db_show_locked_vnodes(struct mount *mp, void *data __unused)
1556 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
1557 if (vn_islocked(vp))
1565 * Top level filesystem related information gathering.
1567 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS);
1570 vfs_sysctl(SYSCTL_HANDLER_ARGS)
1572 int *name = (int *)arg1 - 1; /* XXX */
1573 u_int namelen = arg2 + 1; /* XXX */
1574 struct vfsconf *vfsp;
1577 #if 1 || defined(COMPAT_PRELITE2)
1578 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
1580 return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
1584 /* all sysctl names at this level are at least name and field */
1586 return (ENOTDIR); /* overloaded */
1587 if (name[0] != VFS_GENERIC) {
1588 vfsp = vfsconf_find_by_typenum(name[0]);
1590 return (EOPNOTSUPP);
1591 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1592 oldp, oldlenp, newp, newlen, p));
1596 case VFS_MAXTYPENUM:
1599 maxtypenum = vfsconf_get_maxtypenum();
1600 return (SYSCTL_OUT(req, &maxtypenum, sizeof(maxtypenum)));
1603 return (ENOTDIR); /* overloaded */
1604 vfsp = vfsconf_find_by_typenum(name[2]);
1606 return (EOPNOTSUPP);
1607 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp));
1609 return (EOPNOTSUPP);
1612 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl,
1613 "Generic filesystem");
1615 #if 1 || defined(COMPAT_PRELITE2)
1618 sysctl_ovfs_conf_iter(struct vfsconf *vfsp, void *data)
1621 struct ovfsconf ovfs;
1622 struct sysctl_req *req = (struct sysctl_req*) data;
1624 bzero(&ovfs, sizeof(ovfs));
1625 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
1626 strcpy(ovfs.vfc_name, vfsp->vfc_name);
1627 ovfs.vfc_index = vfsp->vfc_typenum;
1628 ovfs.vfc_refcount = vfsp->vfc_refcount;
1629 ovfs.vfc_flags = vfsp->vfc_flags;
1630 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
1632 return error; /* abort iteration with error code */
1634 return 0; /* continue iterating with next element */
1638 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
1640 return vfsconf_each(sysctl_ovfs_conf_iter, (void*)req);
1643 #endif /* 1 || COMPAT_PRELITE2 */
1646 * Check to see if a filesystem is mounted on a block device.
1649 vfs_mountedon(struct vnode *vp)
1653 if ((dev = vp->v_rdev) == NULL) {
1654 /* if (vp->v_type != VBLK)
1655 dev = get_dev(vp->v_uminor, vp->v_umajor); */
1657 if (dev != NULL && dev->si_mountpoint)
1663 * Unmount all filesystems. The list is traversed in reverse order
1664 * of mounting to avoid dependencies.
1667 static int vfs_umountall_callback(struct mount *mp, void *data);
1670 vfs_unmountall(void)
1675 count = mountlist_scan(vfs_umountall_callback,
1676 NULL, MNTSCAN_REVERSE|MNTSCAN_NOBUSY);
1682 vfs_umountall_callback(struct mount *mp, void *data)
1686 error = dounmount(mp, MNT_FORCE);
1688 mountlist_remove(mp);
1689 kprintf("unmount of filesystem mounted from %s failed (",
1690 mp->mnt_stat.f_mntfromname);
1694 kprintf("%d)\n", error);
1700 * Checks the mount flags for parameter mp and put the names comma-separated
1701 * into a string buffer buf with a size limit specified by len.
1703 * It returns the number of bytes written into buf, and (*errorp) will be
1704 * set to 0, EINVAL (if passed length is 0), or ENOSPC (supplied buffer was
1705 * not large enough). The buffer will be 0-terminated if len was not 0.
1708 vfs_flagstostr(int flags, const struct mountctl_opt *optp,
1709 char *buf, size_t len, int *errorp)
1711 static const struct mountctl_opt optnames[] = {
1712 { MNT_ASYNC, "asynchronous" },
1713 { MNT_EXPORTED, "NFS exported" },
1714 { MNT_LOCAL, "local" },
1715 { MNT_NOATIME, "noatime" },
1716 { MNT_NODEV, "nodev" },
1717 { MNT_NOEXEC, "noexec" },
1718 { MNT_NOSUID, "nosuid" },
1719 { MNT_NOSYMFOLLOW, "nosymfollow" },
1720 { MNT_QUOTA, "with-quotas" },
1721 { MNT_RDONLY, "read-only" },
1722 { MNT_SYNCHRONOUS, "synchronous" },
1723 { MNT_UNION, "union" },
1724 { MNT_NOCLUSTERR, "noclusterr" },
1725 { MNT_NOCLUSTERW, "noclusterw" },
1726 { MNT_SUIDDIR, "suiddir" },
1727 { MNT_SOFTDEP, "soft-updates" },
1728 { MNT_IGNORE, "ignore" },
1738 bleft = len - 1; /* leave room for trailing \0 */
1741 * Checks the size of the string. If it contains
1742 * any data, then we will append the new flags to
1745 actsize = strlen(buf);
1749 /* Default flags if no flags passed */
1753 if (bleft < 0) { /* degenerate case, 0-length buffer */
1758 for (; flags && optp->o_opt; ++optp) {
1759 if ((flags & optp->o_opt) == 0)
1761 optlen = strlen(optp->o_name);
1762 if (bwritten || actsize > 0) {
1767 buf[bwritten++] = ',';
1768 buf[bwritten++] = ' ';
1771 if (bleft < optlen) {
1775 bcopy(optp->o_name, buf + bwritten, optlen);
1778 flags &= ~optp->o_opt;
1782 * Space already reserved for trailing \0
1789 * Build hash lists of net addresses and hang them off the mount point.
1790 * Called by ufs_mount() to set up the lists of export addresses.
1793 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1794 const struct export_args *argp)
1797 struct radix_node_head *rnh;
1799 struct radix_node *rn;
1800 struct sockaddr *saddr, *smask = 0;
1804 if (argp->ex_addrlen == 0) {
1805 if (mp->mnt_flag & MNT_DEFEXPORTED)
1807 np = &nep->ne_defexported;
1808 np->netc_exflags = argp->ex_flags;
1809 np->netc_anon = argp->ex_anon;
1810 np->netc_anon.cr_ref = 1;
1811 mp->mnt_flag |= MNT_DEFEXPORTED;
1815 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN)
1817 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN)
1820 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1821 np = (struct netcred *) kmalloc(i, M_NETADDR, M_WAITOK | M_ZERO);
1822 saddr = (struct sockaddr *) (np + 1);
1823 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
1825 if (saddr->sa_len > argp->ex_addrlen)
1826 saddr->sa_len = argp->ex_addrlen;
1827 if (argp->ex_masklen) {
1828 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1829 error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
1832 if (smask->sa_len > argp->ex_masklen)
1833 smask->sa_len = argp->ex_masklen;
1835 i = saddr->sa_family;
1836 if ((rnh = nep->ne_rtable[i]) == 0) {
1838 * Seems silly to initialize every AF when most are not used,
1839 * do so on demand here
1841 SLIST_FOREACH(dom, &domains, dom_next)
1842 if (dom->dom_family == i && dom->dom_rtattach) {
1843 dom->dom_rtattach((void **) &nep->ne_rtable[i],
1847 if ((rnh = nep->ne_rtable[i]) == 0) {
1852 rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh,
1854 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */
1858 np->netc_exflags = argp->ex_flags;
1859 np->netc_anon = argp->ex_anon;
1860 np->netc_anon.cr_ref = 1;
1863 kfree(np, M_NETADDR);
1869 vfs_free_netcred(struct radix_node *rn, void *w)
1871 struct radix_node_head *rnh = (struct radix_node_head *) w;
1873 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
1874 kfree((caddr_t) rn, M_NETADDR);
1879 * Free the net address hash lists that are hanging off the mount points.
1882 vfs_free_addrlist(struct netexport *nep)
1885 struct radix_node_head *rnh;
1887 for (i = 0; i <= AF_MAX; i++)
1888 if ((rnh = nep->ne_rtable[i])) {
1889 (*rnh->rnh_walktree) (rnh, vfs_free_netcred,
1891 kfree((caddr_t) rnh, M_RTABLE);
1892 nep->ne_rtable[i] = 0;
1897 vfs_export(struct mount *mp, struct netexport *nep,
1898 const struct export_args *argp)
1902 if (argp->ex_flags & MNT_DELEXPORT) {
1903 if (mp->mnt_flag & MNT_EXPUBLIC) {
1904 vfs_setpublicfs(NULL, NULL, NULL);
1905 mp->mnt_flag &= ~MNT_EXPUBLIC;
1907 vfs_free_addrlist(nep);
1908 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
1910 if (argp->ex_flags & MNT_EXPORTED) {
1911 if (argp->ex_flags & MNT_EXPUBLIC) {
1912 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
1914 mp->mnt_flag |= MNT_EXPUBLIC;
1916 if ((error = vfs_hang_addrlist(mp, nep, argp)))
1918 mp->mnt_flag |= MNT_EXPORTED;
1925 * Set the publicly exported filesystem (WebNFS). Currently, only
1926 * one public filesystem is possible in the spec (RFC 2054 and 2055)
1929 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
1930 const struct export_args *argp)
1937 * mp == NULL -> invalidate the current info, the FS is
1938 * no longer exported. May be called from either vfs_export
1939 * or unmount, so check if it hasn't already been done.
1942 if (nfs_pub.np_valid) {
1943 nfs_pub.np_valid = 0;
1944 if (nfs_pub.np_index != NULL) {
1945 FREE(nfs_pub.np_index, M_TEMP);
1946 nfs_pub.np_index = NULL;
1953 * Only one allowed at a time.
1955 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
1959 * Get real filehandle for root of exported FS.
1961 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
1962 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
1964 if ((error = VFS_ROOT(mp, &rvp)))
1967 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
1973 * If an indexfile was specified, pull it in.
1975 if (argp->ex_indexfile != NULL) {
1978 error = vn_get_namelen(rvp, &namelen);
1981 MALLOC(nfs_pub.np_index, char *, namelen, M_TEMP,
1983 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
1987 * Check for illegal filenames.
1989 for (cp = nfs_pub.np_index; *cp; cp++) {
1997 FREE(nfs_pub.np_index, M_TEMP);
2002 nfs_pub.np_mount = mp;
2003 nfs_pub.np_valid = 1;
2008 vfs_export_lookup(struct mount *mp, struct netexport *nep,
2009 struct sockaddr *nam)
2012 struct radix_node_head *rnh;
2013 struct sockaddr *saddr;
2016 if (mp->mnt_flag & MNT_EXPORTED) {
2018 * Lookup in the export list first.
2022 rnh = nep->ne_rtable[saddr->sa_family];
2024 np = (struct netcred *)
2025 (*rnh->rnh_matchaddr)((char *)saddr,
2027 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
2032 * If no address match, use the default if it exists.
2034 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
2035 np = &nep->ne_defexported;
2041 * perform msync on all vnodes under a mount point. The mount point must
2042 * be locked. This code is also responsible for lazy-freeing unreferenced
2043 * vnodes whos VM objects no longer contain pages.
2045 * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state.
2047 * NOTE: XXX VOP_PUTPAGES and friends requires that the vnode be locked,
2048 * but vnode_pager_putpages() doesn't lock the vnode. We have to do it
2049 * way up in this high level function.
2051 static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data);
2052 static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data);
2055 vfs_msync(struct mount *mp, int flags)
2060 * tmpfs sets this flag to prevent msync(), sync, and the
2061 * filesystem periodic syncer from trying to flush VM pages
2062 * to swap. Only pure memory pressure flushes tmpfs VM pages
2065 if (mp->mnt_kern_flag & MNTK_NOMSYNC)
2069 * Ok, scan the vnodes for work.
2071 vmsc_flags = VMSC_GETVP;
2072 if (flags != MNT_WAIT)
2073 vmsc_flags |= VMSC_NOWAIT;
2074 vmntvnodescan(mp, vmsc_flags, vfs_msync_scan1, vfs_msync_scan2,
2075 (void *)(intptr_t)flags);
2079 * scan1 is a fast pre-check. There could be hundreds of thousands of
2080 * vnodes, we cannot afford to do anything heavy weight until we have a
2081 * fairly good indication that there is work to do.
2085 vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data)
2087 int flags = (int)(intptr_t)data;
2089 if ((vp->v_flag & VRECLAIMED) == 0) {
2090 if (vshouldmsync(vp))
2091 return(0); /* call scan2 */
2092 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
2093 (vp->v_flag & VOBJDIRTY) &&
2094 (flags == MNT_WAIT || vn_islocked(vp) == 0)) {
2095 return(0); /* call scan2 */
2100 * do not call scan2, continue the loop
2106 * This callback is handed a locked vnode.
2110 vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data)
2113 int flags = (int)(intptr_t)data;
2115 if (vp->v_flag & VRECLAIMED)
2118 if ((mp->mnt_flag & MNT_RDONLY) == 0 && (vp->v_flag & VOBJDIRTY)) {
2119 if ((obj = vp->v_object) != NULL) {
2120 vm_object_page_clean(obj, 0, 0,
2121 flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC);
2128 * Record a process's interest in events which might happen to
2129 * a vnode. Because poll uses the historic select-style interface
2130 * internally, this routine serves as both the ``check for any
2131 * pending events'' and the ``record my interest in future events''
2132 * functions. (These are done together, while the lock is held,
2133 * to avoid race conditions.)
2136 vn_pollrecord(struct vnode *vp, int events)
2140 KKASSERT(curthread->td_proc != NULL);
2142 lwkt_gettoken(&vlock, &vp->v_token);
2143 if (vp->v_pollinfo.vpi_revents & events) {
2145 * This leaves events we are not interested
2146 * in available for the other process which
2147 * which presumably had requested them
2148 * (otherwise they would never have been
2151 events &= vp->v_pollinfo.vpi_revents;
2152 vp->v_pollinfo.vpi_revents &= ~events;
2154 lwkt_reltoken(&vlock);
2157 vp->v_pollinfo.vpi_events |= events;
2158 selrecord(curthread, &vp->v_pollinfo.vpi_selinfo);
2159 lwkt_reltoken(&vlock);
2164 * Note the occurrence of an event. If the VN_POLLEVENT macro is used,
2165 * it is possible for us to miss an event due to race conditions, but
2166 * that condition is expected to be rare, so for the moment it is the
2167 * preferred interface.
2170 vn_pollevent(struct vnode *vp, int events)
2174 lwkt_gettoken(&vlock, &vp->v_token);
2175 if (vp->v_pollinfo.vpi_events & events) {
2177 * We clear vpi_events so that we don't
2178 * call selwakeup() twice if two events are
2179 * posted before the polling process(es) is
2180 * awakened. This also ensures that we take at
2181 * most one selwakeup() if the polling process
2182 * is no longer interested. However, it does
2183 * mean that only one event can be noticed at
2184 * a time. (Perhaps we should only clear those
2185 * event bits which we note?) XXX
2187 vp->v_pollinfo.vpi_events = 0; /* &= ~events ??? */
2188 vp->v_pollinfo.vpi_revents |= events;
2189 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2191 lwkt_reltoken(&vlock);
2195 * Wake up anyone polling on vp because it is being revoked.
2196 * This depends on dead_poll() returning POLLHUP for correct
2200 vn_pollgone(struct vnode *vp)
2204 lwkt_gettoken(&vlock, &vp->v_token);
2205 if (vp->v_pollinfo.vpi_events) {
2206 vp->v_pollinfo.vpi_events = 0;
2207 selwakeup(&vp->v_pollinfo.vpi_selinfo);
2209 lwkt_reltoken(&vlock);
2213 * extract the cdev_t from a VBLK or VCHR. The vnode must have been opened
2214 * (or v_rdev might be NULL).
2217 vn_todev(struct vnode *vp)
2219 if (vp->v_type != VBLK && vp->v_type != VCHR)
2221 KKASSERT(vp->v_rdev != NULL);
2222 return (vp->v_rdev);
2226 * Check if vnode represents a disk device. The vnode does not need to be
2232 vn_isdisk(struct vnode *vp, int *errp)
2236 if (vp->v_type != VCHR) {
2249 if (dev_is_good(dev) == 0) {
2254 if ((dev_dflags(dev) & D_DISK) == 0) {
2265 vn_get_namelen(struct vnode *vp, int *namelen)
2268 register_t retval[2];
2270 error = VOP_PATHCONF(vp, _PC_NAME_MAX, retval);
2273 *namelen = (int)retval[0];
2278 vop_write_dirent(int *error, struct uio *uio, ino_t d_ino, uint8_t d_type,
2279 uint16_t d_namlen, const char *d_name)
2284 len = _DIRENT_RECLEN(d_namlen);
2285 if (len > uio->uio_resid)
2288 dp = kmalloc(len, M_TEMP, M_WAITOK | M_ZERO);
2291 dp->d_namlen = d_namlen;
2292 dp->d_type = d_type;
2293 bcopy(d_name, dp->d_name, d_namlen);
2295 *error = uiomove((caddr_t)dp, len, uio);
2303 vn_mark_atime(struct vnode *vp, struct thread *td)
2305 struct proc *p = td->td_proc;
2306 struct ucred *cred = p ? p->p_ucred : proc0.p_ucred;
2308 if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
2309 VOP_MARKATIME(vp, cred);