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
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
39 * $FreeBSD: src/sys/kern/vfs_subr.c,v 1.249.2.30 2003/04/04 20:35:57 tegge Exp $
40 * $DragonFly: src/sys/kern/vfs_subr.c,v 1.118 2008/09/17 21:44:18 dillon Exp $
44 * External virtual filesystem routines
48 #include <sys/param.h>
49 #include <sys/systm.h>
52 #include <sys/dirent.h>
53 #include <sys/domain.h>
54 #include <sys/eventhandler.h>
55 #include <sys/fcntl.h>
57 #include <sys/kernel.h>
58 #include <sys/kthread.h>
59 #include <sys/malloc.h>
61 #include <sys/mount.h>
64 #include <sys/reboot.h>
65 #include <sys/socket.h>
67 #include <sys/sysctl.h>
68 #include <sys/syslog.h>
69 #include <sys/unistd.h>
70 #include <sys/vmmeter.h>
71 #include <sys/vnode.h>
73 #include <machine/limits.h>
76 #include <vm/vm_object.h>
77 #include <vm/vm_extern.h>
78 #include <vm/vm_kern.h>
80 #include <vm/vm_map.h>
81 #include <vm/vm_page.h>
82 #include <vm/vm_pager.h>
83 #include <vm/vnode_pager.h>
84 #include <vm/vm_zone.h>
87 #include <sys/thread2.h>
88 #include <sys/sysref2.h>
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, "");
120 static int check_buf_overlap = 2; /* invasive check */
121 SYSCTL_INT(_vfs, OID_AUTO, check_buf_overlap, CTLFLAG_RW,
122 &check_buf_overlap, 0, "");
124 int nfs_mount_type = -1;
125 static struct lwkt_token spechash_token;
126 struct nfs_public nfs_pub; /* publicly exported FS */
129 SYSCTL_INT(_kern, KERN_MAXVNODES, maxvnodes, CTLFLAG_RW,
130 &desiredvnodes, 0, "Maximum number of vnodes");
132 static void vfs_free_addrlist (struct netexport *nep);
133 static int vfs_free_netcred (struct radix_node *rn, void *w);
134 static int vfs_hang_addrlist (struct mount *mp, struct netexport *nep,
135 const struct export_args *argp);
138 * Red black tree functions
140 static int rb_buf_compare(struct buf *b1, struct buf *b2);
141 RB_GENERATE2(buf_rb_tree, buf, b_rbnode, rb_buf_compare, off_t, b_loffset);
142 RB_GENERATE2(buf_rb_hash, buf, b_rbhash, rb_buf_compare, off_t, b_loffset);
145 rb_buf_compare(struct buf *b1, struct buf *b2)
147 if (b1->b_loffset < b2->b_loffset)
149 if (b1->b_loffset > b2->b_loffset)
155 * Returns non-zero if the vnode is a candidate for lazy msyncing.
157 * NOTE: v_object is not stable (this scan can race), however the
158 * mntvnodescan code holds vmobj_token so any VM object we
159 * do find will remain stable storage.
162 vshouldmsync(struct vnode *vp)
166 if (vp->v_auxrefs != 0 || vp->v_sysref.refcnt > 0)
167 return (0); /* other holders */
168 object = vp->v_object;
170 if (object && (object->ref_count || object->resident_page_count))
176 * Initialize the vnode management data structures.
178 * Called from vfsinit()
187 * Desiredvnodes is kern.maxvnodes. We want to scale it
188 * according to available system memory but we may also have
189 * to limit it based on available KVM, which is capped on 32 bit
192 * WARNING! For machines with 64-256M of ram we have to be sure
193 * that the default limit scales down well due to HAMMER
194 * taking up significantly more memory per-vnode vs UFS.
195 * We want around ~5800 on a 128M machine.
197 factor1 = 20 * (sizeof(struct vm_object) + sizeof(struct vnode));
198 factor2 = 22 * (sizeof(struct vm_object) + sizeof(struct vnode));
200 imin((int64_t)vmstats.v_page_count * PAGE_SIZE / factor1,
202 desiredvnodes = imax(desiredvnodes, maxproc * 8);
204 lwkt_token_init(&spechash_token, 1, "spechash");
208 * Knob to control the precision of file timestamps:
210 * 0 = seconds only; nanoseconds zeroed.
211 * 1 = seconds and nanoseconds, accurate within 1/HZ.
212 * 2 = seconds and nanoseconds, truncated to microseconds.
213 * >=3 = seconds and nanoseconds, maximum precision.
215 enum { TSP_SEC, TSP_HZ, TSP_USEC, TSP_NSEC };
217 static int timestamp_precision = TSP_SEC;
218 SYSCTL_INT(_vfs, OID_AUTO, timestamp_precision, CTLFLAG_RW,
219 ×tamp_precision, 0, "");
222 * Get a current timestamp.
227 vfs_timestamp(struct timespec *tsp)
231 switch (timestamp_precision) {
233 tsp->tv_sec = time_second;
241 TIMEVAL_TO_TIMESPEC(&tv, tsp);
251 * Set vnode attributes to VNOVAL
254 vattr_null(struct vattr *vap)
257 vap->va_size = VNOVAL;
258 vap->va_bytes = VNOVAL;
259 vap->va_mode = VNOVAL;
260 vap->va_nlink = VNOVAL;
261 vap->va_uid = VNOVAL;
262 vap->va_gid = VNOVAL;
263 vap->va_fsid = VNOVAL;
264 vap->va_fileid = VNOVAL;
265 vap->va_blocksize = VNOVAL;
266 vap->va_rmajor = VNOVAL;
267 vap->va_rminor = VNOVAL;
268 vap->va_atime.tv_sec = VNOVAL;
269 vap->va_atime.tv_nsec = VNOVAL;
270 vap->va_mtime.tv_sec = VNOVAL;
271 vap->va_mtime.tv_nsec = VNOVAL;
272 vap->va_ctime.tv_sec = VNOVAL;
273 vap->va_ctime.tv_nsec = VNOVAL;
274 vap->va_flags = VNOVAL;
275 vap->va_gen = VNOVAL;
277 /* va_*_uuid fields are only valid if related flags are set */
281 * Flush out and invalidate all buffers associated with a vnode.
285 static int vinvalbuf_bp(struct buf *bp, void *data);
287 struct vinvalbuf_bp_info {
296 vinvalbuf(struct vnode *vp, int flags, int slpflag, int slptimeo)
298 struct vinvalbuf_bp_info info;
302 lwkt_gettoken(&vp->v_token);
305 * If we are being asked to save, call fsync to ensure that the inode
308 if (flags & V_SAVE) {
309 error = bio_track_wait(&vp->v_track_write, slpflag, slptimeo);
312 if (!RB_EMPTY(&vp->v_rbdirty_tree)) {
313 if ((error = VOP_FSYNC(vp, MNT_WAIT, 0)) != 0)
317 * Dirty bufs may be left or generated via races
318 * in circumstances where vinvalbuf() is called on
319 * a vnode not undergoing reclamation. Only
320 * panic if we are trying to reclaim the vnode.
322 if ((vp->v_flag & VRECLAIMED) &&
323 (bio_track_active(&vp->v_track_write) ||
324 !RB_EMPTY(&vp->v_rbdirty_tree))) {
325 panic("vinvalbuf: dirty bufs");
329 info.slptimeo = slptimeo;
330 info.lkflags = LK_EXCLUSIVE | LK_SLEEPFAIL;
331 if (slpflag & PCATCH)
332 info.lkflags |= LK_PCATCH;
337 * Flush the buffer cache until nothing is left.
339 while (!RB_EMPTY(&vp->v_rbclean_tree) ||
340 !RB_EMPTY(&vp->v_rbdirty_tree)) {
342 error = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree, NULL,
343 vinvalbuf_bp, &info);
346 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
347 vinvalbuf_bp, &info);
352 * Wait for I/O completion. We may block in the pip code so we have
356 bio_track_wait(&vp->v_track_write, 0, 0);
357 if ((object = vp->v_object) != NULL) {
358 while (object->paging_in_progress)
359 vm_object_pip_sleep(object, "vnvlbx");
361 } while (bio_track_active(&vp->v_track_write));
364 * Destroy the copy in the VM cache, too.
366 if ((object = vp->v_object) != NULL) {
367 vm_object_page_remove(object, 0, 0,
368 (flags & V_SAVE) ? TRUE : FALSE);
371 if (!RB_EMPTY(&vp->v_rbdirty_tree) || !RB_EMPTY(&vp->v_rbclean_tree))
372 panic("vinvalbuf: flush failed");
373 if (!RB_EMPTY(&vp->v_rbhash_tree))
374 panic("vinvalbuf: flush failed, buffers still present");
377 lwkt_reltoken(&vp->v_token);
382 vinvalbuf_bp(struct buf *bp, void *data)
384 struct vinvalbuf_bp_info *info = data;
387 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
388 atomic_add_int(&bp->b_refs, 1);
389 error = BUF_TIMELOCK(bp, info->lkflags,
390 "vinvalbuf", info->slptimeo);
391 atomic_subtract_int(&bp->b_refs, 1);
400 KKASSERT(bp->b_vp == info->vp);
403 * Must check clean/dirty status after successfully locking as
406 if ((info->clean && (bp->b_flags & B_DELWRI)) ||
407 (info->clean == 0 && (bp->b_flags & B_DELWRI) == 0)) {
413 * Note that vfs_bio_awrite expects buffers to reside
414 * on a queue, while bwrite() and brelse() do not.
416 * NOTE: NO B_LOCKED CHECK. Also no buf_checkwrite()
417 * check. This code will write out the buffer, period.
419 if (((bp->b_flags & (B_DELWRI | B_INVAL)) == B_DELWRI) &&
420 (info->flags & V_SAVE)) {
421 if (bp->b_flags & B_CLUSTEROK) {
427 } else if (info->flags & V_SAVE) {
429 * Cannot set B_NOCACHE on a clean buffer as this will
430 * destroy the VM backing store which might actually
431 * be dirty (and unsynchronized).
434 bp->b_flags |= (B_INVAL | B_RELBUF);
438 bp->b_flags |= (B_INVAL | B_NOCACHE | B_RELBUF);
445 * Truncate a file's buffer and pages to a specified length. This
446 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
449 * The vnode must be locked.
451 static int vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data);
452 static int vtruncbuf_bp_trunc(struct buf *bp, void *data);
453 static int vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data);
454 static int vtruncbuf_bp_metasync(struct buf *bp, void *data);
456 struct vtruncbuf_info {
463 vtruncbuf(struct vnode *vp, off_t length, int blksize)
465 struct vtruncbuf_info info;
466 const char *filename;
470 * Round up to the *next* block, then destroy the buffers in question.
471 * Since we are only removing some of the buffers we must rely on the
472 * scan count to determine whether a loop is necessary.
474 if ((count = (int)(length % blksize)) != 0)
475 info.truncloffset = length + (blksize - count);
477 info.truncloffset = length;
480 lwkt_gettoken(&vp->v_token);
483 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
484 vtruncbuf_bp_trunc_cmp,
485 vtruncbuf_bp_trunc, &info);
487 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
488 vtruncbuf_bp_trunc_cmp,
489 vtruncbuf_bp_trunc, &info);
493 * For safety, fsync any remaining metadata if the file is not being
494 * truncated to 0. Since the metadata does not represent the entire
495 * dirty list we have to rely on the hit count to ensure that we get
500 count = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
501 vtruncbuf_bp_metasync_cmp,
502 vtruncbuf_bp_metasync, &info);
507 * Clean out any left over VM backing store.
509 * It is possible to have in-progress I/O from buffers that were
510 * not part of the truncation. This should not happen if we
511 * are truncating to 0-length.
513 vnode_pager_setsize(vp, length);
514 bio_track_wait(&vp->v_track_write, 0, 0);
519 spin_lock(&vp->v_spinlock);
520 filename = TAILQ_FIRST(&vp->v_namecache) ?
521 TAILQ_FIRST(&vp->v_namecache)->nc_name : "?";
522 spin_unlock(&vp->v_spinlock);
525 * Make sure no buffers were instantiated while we were trying
526 * to clean out the remaining VM pages. This could occur due
527 * to busy dirty VM pages being flushed out to disk.
531 count = RB_SCAN(buf_rb_tree, &vp->v_rbclean_tree,
532 vtruncbuf_bp_trunc_cmp,
533 vtruncbuf_bp_trunc, &info);
535 count += RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
536 vtruncbuf_bp_trunc_cmp,
537 vtruncbuf_bp_trunc, &info);
539 kprintf("Warning: vtruncbuf(): Had to re-clean %d "
540 "left over buffers in %s\n", count, filename);
544 lwkt_reltoken(&vp->v_token);
550 * The callback buffer is beyond the new file EOF and must be destroyed.
551 * Note that the compare function must conform to the RB_SCAN's requirements.
555 vtruncbuf_bp_trunc_cmp(struct buf *bp, void *data)
557 struct vtruncbuf_info *info = data;
559 if (bp->b_loffset >= info->truncloffset)
566 vtruncbuf_bp_trunc(struct buf *bp, void *data)
568 struct vtruncbuf_info *info = data;
571 * Do not try to use a buffer we cannot immediately lock, but sleep
572 * anyway to prevent a livelock. The code will loop until all buffers
575 * We must always revalidate the buffer after locking it to deal
578 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
579 atomic_add_int(&bp->b_refs, 1);
580 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
582 atomic_subtract_int(&bp->b_refs, 1);
583 } else if ((info->clean && (bp->b_flags & B_DELWRI)) ||
584 (info->clean == 0 && (bp->b_flags & B_DELWRI) == 0) ||
585 bp->b_vp != info->vp ||
586 vtruncbuf_bp_trunc_cmp(bp, data)) {
590 bp->b_flags |= (B_INVAL | B_RELBUF | B_NOCACHE);
597 * Fsync all meta-data after truncating a file to be non-zero. Only metadata
598 * blocks (with a negative loffset) are scanned.
599 * Note that the compare function must conform to the RB_SCAN's requirements.
602 vtruncbuf_bp_metasync_cmp(struct buf *bp, void *data __unused)
604 if (bp->b_loffset < 0)
610 vtruncbuf_bp_metasync(struct buf *bp, void *data)
612 struct vtruncbuf_info *info = data;
614 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
615 atomic_add_int(&bp->b_refs, 1);
616 if (BUF_LOCK(bp, LK_EXCLUSIVE|LK_SLEEPFAIL) == 0)
618 atomic_subtract_int(&bp->b_refs, 1);
619 } else if ((bp->b_flags & B_DELWRI) == 0 ||
620 bp->b_vp != info->vp ||
621 vtruncbuf_bp_metasync_cmp(bp, data)) {
625 if (bp->b_vp == info->vp)
634 * vfsync - implements a multipass fsync on a file which understands
635 * dependancies and meta-data. The passed vnode must be locked. The
636 * waitfor argument may be MNT_WAIT or MNT_NOWAIT, or MNT_LAZY.
638 * When fsyncing data asynchronously just do one consolidated pass starting
639 * with the most negative block number. This may not get all the data due
642 * When fsyncing data synchronously do a data pass, then a metadata pass,
643 * then do additional data+metadata passes to try to get all the data out.
645 static int vfsync_wait_output(struct vnode *vp,
646 int (*waitoutput)(struct vnode *, struct thread *));
647 static int vfsync_dummy_cmp(struct buf *bp __unused, void *data __unused);
648 static int vfsync_data_only_cmp(struct buf *bp, void *data);
649 static int vfsync_meta_only_cmp(struct buf *bp, void *data);
650 static int vfsync_lazy_range_cmp(struct buf *bp, void *data);
651 static int vfsync_bp(struct buf *bp, void *data);
660 int (*checkdef)(struct buf *);
661 int (*cmpfunc)(struct buf *, void *);
665 vfsync(struct vnode *vp, int waitfor, int passes,
666 int (*checkdef)(struct buf *),
667 int (*waitoutput)(struct vnode *, struct thread *))
669 struct vfsync_info info;
672 bzero(&info, sizeof(info));
674 if ((info.checkdef = checkdef) == NULL)
677 lwkt_gettoken(&vp->v_token);
682 * Lazy (filesystem syncer typ) Asynchronous plus limit the
683 * number of data (not meta) pages we try to flush to 1MB.
684 * A non-zero return means that lazy limit was reached.
686 info.lazylimit = 1024 * 1024;
688 info.cmpfunc = vfsync_lazy_range_cmp;
689 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
690 vfsync_lazy_range_cmp, vfsync_bp, &info);
691 info.cmpfunc = vfsync_meta_only_cmp;
692 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree,
693 vfsync_meta_only_cmp, vfsync_bp, &info);
696 else if (!RB_EMPTY(&vp->v_rbdirty_tree))
697 vn_syncer_add(vp, 1);
702 * Asynchronous. Do a data-only pass and a meta-only pass.
705 info.cmpfunc = vfsync_data_only_cmp;
706 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
708 info.cmpfunc = vfsync_meta_only_cmp;
709 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_meta_only_cmp,
715 * Synchronous. Do a data-only pass, then a meta-data+data
716 * pass, then additional integrated passes to try to get
717 * all the dependancies flushed.
719 info.cmpfunc = vfsync_data_only_cmp;
720 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, vfsync_data_only_cmp,
722 error = vfsync_wait_output(vp, waitoutput);
724 info.skippedbufs = 0;
725 info.cmpfunc = vfsync_dummy_cmp;
726 RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
728 error = vfsync_wait_output(vp, waitoutput);
729 if (info.skippedbufs)
730 kprintf("Warning: vfsync skipped %d dirty bufs in pass2!\n", info.skippedbufs);
732 while (error == 0 && passes > 0 &&
733 !RB_EMPTY(&vp->v_rbdirty_tree)
736 info.synchronous = 1;
739 info.cmpfunc = vfsync_dummy_cmp;
740 error = RB_SCAN(buf_rb_tree, &vp->v_rbdirty_tree, NULL,
746 error = vfsync_wait_output(vp, waitoutput);
750 lwkt_reltoken(&vp->v_token);
755 vfsync_wait_output(struct vnode *vp,
756 int (*waitoutput)(struct vnode *, struct thread *))
760 error = bio_track_wait(&vp->v_track_write, 0, 0);
762 error = waitoutput(vp, curthread);
767 vfsync_dummy_cmp(struct buf *bp __unused, void *data __unused)
773 vfsync_data_only_cmp(struct buf *bp, void *data)
775 if (bp->b_loffset < 0)
781 vfsync_meta_only_cmp(struct buf *bp, void *data)
783 if (bp->b_loffset < 0)
789 vfsync_lazy_range_cmp(struct buf *bp, void *data)
791 struct vfsync_info *info = data;
793 if (bp->b_loffset < info->vp->v_lazyw)
799 vfsync_bp(struct buf *bp, void *data)
801 struct vfsync_info *info = data;
802 struct vnode *vp = info->vp;
806 * Ignore buffers that we cannot immediately lock.
808 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT)) {
809 kprintf("Warning: vfsync_bp skipping dirty buffer %p\n", bp);
815 * We must revalidate the buffer after locking.
817 if ((bp->b_flags & B_DELWRI) == 0 ||
818 bp->b_vp != info->vp ||
819 info->cmpfunc(bp, data)) {
825 * If syncdeps is not set we do not try to write buffers which have
828 if (!info->synchronous && info->syncdeps == 0 && info->checkdef(bp)) {
834 * B_NEEDCOMMIT (primarily used by NFS) is a state where the buffer
835 * has been written but an additional handshake with the device
836 * is required before we can dispose of the buffer. We have no idea
837 * how to do this so we have to skip these buffers.
839 if (bp->b_flags & B_NEEDCOMMIT) {
845 * Ask bioops if it is ok to sync. If not the VFS may have
846 * set B_LOCKED so we have to cycle the buffer.
848 if (LIST_FIRST(&bp->b_dep) != NULL && buf_checkwrite(bp)) {
854 if (info->synchronous) {
856 * Synchronous flushing. An error may be returned.
862 * Asynchronous flushing. A negative return value simply
863 * stops the scan and is not considered an error. We use
864 * this to support limited MNT_LAZY flushes.
866 vp->v_lazyw = bp->b_loffset;
867 if ((vp->v_flag & VOBJBUF) && (bp->b_flags & B_CLUSTEROK)) {
868 info->lazycount += vfs_bio_awrite(bp);
870 info->lazycount += bp->b_bufsize;
874 waitrunningbufspace();
875 if (info->lazylimit && info->lazycount >= info->lazylimit)
884 * Associate a buffer with a vnode.
889 bgetvp(struct vnode *vp, struct buf *bp, int testsize)
891 KASSERT(bp->b_vp == NULL, ("bgetvp: not free"));
892 KKASSERT((bp->b_flags & (B_HASHED|B_DELWRI|B_VNCLEAN|B_VNDIRTY)) == 0);
895 * Insert onto list for new vnode.
897 lwkt_gettoken(&vp->v_token);
899 if (buf_rb_hash_RB_INSERT(&vp->v_rbhash_tree, bp)) {
900 lwkt_reltoken(&vp->v_token);
905 * Diagnostics (mainly for HAMMER debugging). Check for
906 * overlapping buffers.
908 if (check_buf_overlap) {
910 bx = buf_rb_hash_RB_PREV(bp);
912 if (bx->b_loffset + bx->b_bufsize > bp->b_loffset) {
913 kprintf("bgetvp: overlapl %016jx/%d %016jx "
915 (intmax_t)bx->b_loffset,
917 (intmax_t)bp->b_loffset,
919 if (check_buf_overlap > 1)
920 panic("bgetvp - overlapping buffer");
923 bx = buf_rb_hash_RB_NEXT(bp);
925 if (bp->b_loffset + testsize > bx->b_loffset) {
926 kprintf("bgetvp: overlapr %016jx/%d %016jx "
928 (intmax_t)bp->b_loffset,
930 (intmax_t)bx->b_loffset,
932 if (check_buf_overlap > 1)
933 panic("bgetvp - overlapping buffer");
938 bp->b_flags |= B_HASHED;
939 bp->b_flags |= B_VNCLEAN;
940 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp))
941 panic("reassignbuf: dup lblk/clean vp %p bp %p", vp, bp);
943 lwkt_reltoken(&vp->v_token);
948 * Disassociate a buffer from a vnode.
953 brelvp(struct buf *bp)
957 KASSERT(bp->b_vp != NULL, ("brelvp: NULL"));
960 * Delete from old vnode list, if on one.
963 lwkt_gettoken(&vp->v_token);
964 if (bp->b_flags & (B_VNDIRTY | B_VNCLEAN)) {
965 if (bp->b_flags & B_VNDIRTY)
966 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
968 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
969 bp->b_flags &= ~(B_VNDIRTY | B_VNCLEAN);
971 if (bp->b_flags & B_HASHED) {
972 buf_rb_hash_RB_REMOVE(&vp->v_rbhash_tree, bp);
973 bp->b_flags &= ~B_HASHED;
975 if ((vp->v_flag & VONWORKLST) && RB_EMPTY(&vp->v_rbdirty_tree))
976 vn_syncer_remove(vp);
979 lwkt_reltoken(&vp->v_token);
985 * Reassign the buffer to the proper clean/dirty list based on B_DELWRI.
986 * This routine is called when the state of the B_DELWRI bit is changed.
988 * Must be called with vp->v_token held.
992 reassignbuf(struct buf *bp)
994 struct vnode *vp = bp->b_vp;
997 ASSERT_LWKT_TOKEN_HELD(&vp->v_token);
1001 * B_PAGING flagged buffers cannot be reassigned because their vp
1002 * is not fully linked in.
1004 if (bp->b_flags & B_PAGING)
1005 panic("cannot reassign paging buffer");
1007 if (bp->b_flags & B_DELWRI) {
1009 * Move to the dirty list, add the vnode to the worklist
1011 if (bp->b_flags & B_VNCLEAN) {
1012 buf_rb_tree_RB_REMOVE(&vp->v_rbclean_tree, bp);
1013 bp->b_flags &= ~B_VNCLEAN;
1015 if ((bp->b_flags & B_VNDIRTY) == 0) {
1016 if (buf_rb_tree_RB_INSERT(&vp->v_rbdirty_tree, bp)) {
1017 panic("reassignbuf: dup lblk vp %p bp %p",
1020 bp->b_flags |= B_VNDIRTY;
1022 if ((vp->v_flag & VONWORKLST) == 0) {
1023 switch (vp->v_type) {
1030 vp->v_rdev->si_mountpoint != NULL) {
1038 vn_syncer_add(vp, delay);
1042 * Move to the clean list, remove the vnode from the worklist
1043 * if no dirty blocks remain.
1045 if (bp->b_flags & B_VNDIRTY) {
1046 buf_rb_tree_RB_REMOVE(&vp->v_rbdirty_tree, bp);
1047 bp->b_flags &= ~B_VNDIRTY;
1049 if ((bp->b_flags & B_VNCLEAN) == 0) {
1050 if (buf_rb_tree_RB_INSERT(&vp->v_rbclean_tree, bp)) {
1051 panic("reassignbuf: dup lblk vp %p bp %p",
1054 bp->b_flags |= B_VNCLEAN;
1056 if ((vp->v_flag & VONWORKLST) &&
1057 RB_EMPTY(&vp->v_rbdirty_tree)) {
1058 vn_syncer_remove(vp);
1064 * Create a vnode for a block device.
1065 * Used for mounting the root file system.
1067 extern struct vop_ops *devfs_vnode_dev_vops_p;
1069 bdevvp(cdev_t dev, struct vnode **vpp)
1079 error = getspecialvnode(VT_NON, NULL, &devfs_vnode_dev_vops_p,
1090 v_associate_rdev(vp, dev);
1091 vp->v_umajor = dev->si_umajor;
1092 vp->v_uminor = dev->si_uminor;
1099 v_associate_rdev(struct vnode *vp, cdev_t dev)
1103 if (dev_is_good(dev) == 0)
1105 KKASSERT(vp->v_rdev == NULL);
1106 vp->v_rdev = reference_dev(dev);
1107 lwkt_gettoken(&spechash_token);
1108 SLIST_INSERT_HEAD(&dev->si_hlist, vp, v_cdevnext);
1109 lwkt_reltoken(&spechash_token);
1114 v_release_rdev(struct vnode *vp)
1118 if ((dev = vp->v_rdev) != NULL) {
1119 lwkt_gettoken(&spechash_token);
1120 SLIST_REMOVE(&dev->si_hlist, vp, vnode, v_cdevnext);
1123 lwkt_reltoken(&spechash_token);
1128 * Add a vnode to the alias list hung off the cdev_t. We only associate
1129 * the device number with the vnode. The actual device is not associated
1130 * until the vnode is opened (usually in spec_open()), and will be
1131 * disassociated on last close.
1134 addaliasu(struct vnode *nvp, int x, int y)
1136 if (nvp->v_type != VBLK && nvp->v_type != VCHR)
1137 panic("addaliasu on non-special vnode");
1143 * Simple call that a filesystem can make to try to get rid of a
1144 * vnode. It will fail if anyone is referencing the vnode (including
1147 * The filesystem can check whether its in-memory inode structure still
1148 * references the vp on return.
1151 vclean_unlocked(struct vnode *vp)
1154 if (sysref_isactive(&vp->v_sysref) == 0)
1160 * Disassociate a vnode from its underlying filesystem.
1162 * The vnode must be VX locked and referenced. In all normal situations
1163 * there are no active references. If vclean_vxlocked() is called while
1164 * there are active references, the vnode is being ripped out and we have
1165 * to call VOP_CLOSE() as appropriate before we can reclaim it.
1168 vclean_vxlocked(struct vnode *vp, int flags)
1175 * If the vnode has already been reclaimed we have nothing to do.
1177 if (vp->v_flag & VRECLAIMED)
1179 vsetflags(vp, VRECLAIMED);
1182 * Scrap the vfs cache
1184 while (cache_inval_vp(vp, 0) != 0) {
1185 kprintf("Warning: vnode %p clean/cache_resolution race detected\n", vp);
1186 tsleep(vp, 0, "vclninv", 2);
1190 * Check to see if the vnode is in use. If so we have to reference it
1191 * before we clean it out so that its count cannot fall to zero and
1192 * generate a race against ourselves to recycle it.
1194 active = sysref_isactive(&vp->v_sysref);
1197 * Clean out any buffers associated with the vnode and destroy its
1198 * object, if it has one.
1200 vinvalbuf(vp, V_SAVE, 0, 0);
1203 * If purging an active vnode (typically during a forced unmount
1204 * or reboot), it must be closed and deactivated before being
1205 * reclaimed. This isn't really all that safe, but what can
1208 * Note that neither of these routines unlocks the vnode.
1210 if (active && (flags & DOCLOSE)) {
1211 while ((n = vp->v_opencount) != 0) {
1212 if (vp->v_writecount)
1213 VOP_CLOSE(vp, FWRITE|FNONBLOCK);
1215 VOP_CLOSE(vp, FNONBLOCK);
1216 if (vp->v_opencount == n) {
1217 kprintf("Warning: unable to force-close"
1225 * If the vnode has not been deactivated, deactivated it. Deactivation
1226 * can create new buffers and VM pages so we have to call vinvalbuf()
1227 * again to make sure they all get flushed.
1229 * This can occur if a file with a link count of 0 needs to be
1232 * If the vnode is already dead don't try to deactivate it.
1234 if ((vp->v_flag & VINACTIVE) == 0) {
1235 vsetflags(vp, VINACTIVE);
1238 vinvalbuf(vp, V_SAVE, 0, 0);
1242 * If the vnode has an object, destroy it.
1244 lwkt_gettoken(&vmobj_token);
1245 if ((object = vp->v_object) != NULL) {
1246 KKASSERT(object == vp->v_object);
1247 if (object->ref_count == 0) {
1248 if ((object->flags & OBJ_DEAD) == 0)
1249 vm_object_terminate(object);
1251 vm_pager_deallocate(object);
1253 vclrflags(vp, VOBJBUF);
1255 lwkt_reltoken(&vmobj_token);
1256 KKASSERT((vp->v_flag & VOBJBUF) == 0);
1259 * Reclaim the vnode if not already dead.
1261 if (vp->v_mount && VOP_RECLAIM(vp))
1262 panic("vclean: cannot reclaim");
1265 * Done with purge, notify sleepers of the grim news.
1267 vp->v_ops = &dead_vnode_vops_p;
1272 * If we are destroying an active vnode, reactivate it now that
1273 * we have reassociated it with deadfs. This prevents the system
1274 * from crashing on the vnode due to it being unexpectedly marked
1275 * as inactive or reclaimed.
1277 if (active && (flags & DOCLOSE)) {
1278 vclrflags(vp, VINACTIVE | VRECLAIMED);
1283 * Eliminate all activity associated with the requested vnode
1284 * and with all vnodes aliased to the requested vnode.
1286 * The vnode must be referenced but should not be locked.
1289 vrevoke(struct vnode *vp, struct ucred *cred)
1297 * If the vnode has a device association, scrap all vnodes associated
1298 * with the device. Don't let the device disappear on us while we
1299 * are scrapping the vnodes.
1301 * The passed vp will probably show up in the list, do not VX lock
1304 * Releasing the vnode's rdev here can mess up specfs's call to
1305 * device close, so don't do it. The vnode has been disassociated
1306 * and the device will be closed after the last ref on the related
1307 * fp goes away (if not still open by e.g. the kernel).
1309 if (vp->v_type != VCHR) {
1310 error = fdrevoke(vp, DTYPE_VNODE, cred);
1313 if ((dev = vp->v_rdev) == NULL) {
1317 lwkt_gettoken(&spechash_token);
1319 vqn = SLIST_FIRST(&dev->si_hlist);
1322 while ((vq = vqn) != NULL) {
1323 vqn = SLIST_NEXT(vqn, v_cdevnext);
1326 fdrevoke(vq, DTYPE_VNODE, cred);
1327 /*v_release_rdev(vq);*/
1330 lwkt_reltoken(&spechash_token);
1337 * This is called when the object underlying a vnode is being destroyed,
1338 * such as in a remove(). Try to recycle the vnode immediately if the
1339 * only active reference is our reference.
1341 * Directory vnodes in the namecache with children cannot be immediately
1342 * recycled because numerous VOP_N*() ops require them to be stable.
1344 * To avoid recursive recycling from VOP_INACTIVE implemenetations this
1345 * function is a NOP if VRECLAIMED is already set.
1348 vrecycle(struct vnode *vp)
1350 if (vp->v_sysref.refcnt <= 1 && (vp->v_flag & VRECLAIMED) == 0) {
1351 if (cache_inval_vp_nonblock(vp))
1360 * Return the maximum I/O size allowed for strategy calls on VP.
1362 * If vp is VCHR or VBLK we dive the device, otherwise we use
1363 * the vp's mount info.
1366 vmaxiosize(struct vnode *vp)
1368 if (vp->v_type == VBLK || vp->v_type == VCHR) {
1369 return(vp->v_rdev->si_iosize_max);
1371 return(vp->v_mount->mnt_iosize_max);
1376 * Eliminate all activity associated with a vnode in preparation for reuse.
1378 * The vnode must be VX locked and refd and will remain VX locked and refd
1379 * on return. This routine may be called with the vnode in any state, as
1380 * long as it is VX locked. The vnode will be cleaned out and marked
1381 * VRECLAIMED but will not actually be reused until all existing refs and
1384 * NOTE: This routine may be called on a vnode which has not yet been
1385 * already been deactivated (VOP_INACTIVE), or on a vnode which has
1386 * already been reclaimed.
1388 * This routine is not responsible for placing us back on the freelist.
1389 * Instead, it happens automatically when the caller releases the VX lock
1390 * (assuming there aren't any other references).
1393 vgone_vxlocked(struct vnode *vp)
1396 * assert that the VX lock is held. This is an absolute requirement
1397 * now for vgone_vxlocked() to be called.
1399 KKASSERT(vp->v_lock.lk_exclusivecount == 1);
1404 * Clean out the filesystem specific data and set the VRECLAIMED
1405 * bit. Also deactivate the vnode if necessary.
1407 vclean_vxlocked(vp, DOCLOSE);
1410 * Delete from old mount point vnode list, if on one.
1412 if (vp->v_mount != NULL) {
1413 KKASSERT(vp->v_data == NULL);
1414 insmntque(vp, NULL);
1418 * If special device, remove it from special device alias list
1419 * if it is on one. This should normally only occur if a vnode is
1420 * being revoked as the device should otherwise have been released
1423 if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_rdev != NULL) {
1435 * Lookup a vnode by device number.
1437 * Returns non-zero and *vpp set to a vref'd vnode on success.
1438 * Returns zero on failure.
1441 vfinddev(cdev_t dev, enum vtype type, struct vnode **vpp)
1445 lwkt_gettoken(&spechash_token);
1446 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1447 if (type == vp->v_type) {
1450 lwkt_reltoken(&spechash_token);
1454 lwkt_reltoken(&spechash_token);
1459 * Calculate the total number of references to a special device. This
1460 * routine may only be called for VBLK and VCHR vnodes since v_rdev is
1461 * an overloaded field. Since udev2dev can now return NULL, we have
1462 * to check for a NULL v_rdev.
1465 count_dev(cdev_t dev)
1470 if (SLIST_FIRST(&dev->si_hlist)) {
1471 lwkt_gettoken(&spechash_token);
1472 SLIST_FOREACH(vp, &dev->si_hlist, v_cdevnext) {
1473 count += vp->v_opencount;
1475 lwkt_reltoken(&spechash_token);
1481 vcount(struct vnode *vp)
1483 if (vp->v_rdev == NULL)
1485 return(count_dev(vp->v_rdev));
1489 * Initialize VMIO for a vnode. This routine MUST be called before a
1490 * VFS can issue buffer cache ops on a vnode. It is typically called
1491 * when a vnode is initialized from its inode.
1494 vinitvmio(struct vnode *vp, off_t filesize, int blksize, int boff)
1499 lwkt_gettoken(&vmobj_token);
1501 if ((object = vp->v_object) == NULL) {
1502 object = vnode_pager_alloc(vp, filesize, 0, 0, blksize, boff);
1504 * Dereference the reference we just created. This assumes
1505 * that the object is associated with the vp.
1507 object->ref_count--;
1510 if (object->flags & OBJ_DEAD) {
1512 if (vp->v_object == object)
1513 vm_object_dead_sleep(object, "vodead");
1514 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1518 KASSERT(vp->v_object != NULL, ("vinitvmio: NULL object"));
1519 vsetflags(vp, VOBJBUF);
1520 lwkt_reltoken(&vmobj_token);
1527 * Print out a description of a vnode.
1529 static char *typename[] =
1530 {"VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD"};
1533 vprint(char *label, struct vnode *vp)
1538 kprintf("%s: %p: ", label, (void *)vp);
1540 kprintf("%p: ", (void *)vp);
1541 kprintf("type %s, sysrefs %d, writecount %d, holdcnt %d,",
1542 typename[vp->v_type],
1543 vp->v_sysref.refcnt, vp->v_writecount, vp->v_auxrefs);
1545 if (vp->v_flag & VROOT)
1546 strcat(buf, "|VROOT");
1547 if (vp->v_flag & VPFSROOT)
1548 strcat(buf, "|VPFSROOT");
1549 if (vp->v_flag & VTEXT)
1550 strcat(buf, "|VTEXT");
1551 if (vp->v_flag & VSYSTEM)
1552 strcat(buf, "|VSYSTEM");
1553 if (vp->v_flag & VFREE)
1554 strcat(buf, "|VFREE");
1555 if (vp->v_flag & VOBJBUF)
1556 strcat(buf, "|VOBJBUF");
1558 kprintf(" flags (%s)", &buf[1]);
1559 if (vp->v_data == NULL) {
1568 * Do the usual access checking.
1569 * file_mode, uid and gid are from the vnode in question,
1570 * while acc_mode and cred are from the VOP_ACCESS parameter list
1573 vaccess(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
1574 mode_t acc_mode, struct ucred *cred)
1580 * Super-user always gets read/write access, but execute access depends
1581 * on at least one execute bit being set.
1583 if (priv_check_cred(cred, PRIV_ROOT, 0) == 0) {
1584 if ((acc_mode & VEXEC) && type != VDIR &&
1585 (file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
1592 /* Otherwise, check the owner. */
1593 if (cred->cr_uid == uid) {
1594 if (acc_mode & VEXEC)
1596 if (acc_mode & VREAD)
1598 if (acc_mode & VWRITE)
1600 return ((file_mode & mask) == mask ? 0 : EACCES);
1603 /* Otherwise, check the groups. */
1604 ismember = groupmember(gid, cred);
1605 if (cred->cr_svgid == gid || ismember) {
1606 if (acc_mode & VEXEC)
1608 if (acc_mode & VREAD)
1610 if (acc_mode & VWRITE)
1612 return ((file_mode & mask) == mask ? 0 : EACCES);
1615 /* Otherwise, check everyone else. */
1616 if (acc_mode & VEXEC)
1618 if (acc_mode & VREAD)
1620 if (acc_mode & VWRITE)
1622 return ((file_mode & mask) == mask ? 0 : EACCES);
1626 #include <ddb/ddb.h>
1628 static int db_show_locked_vnodes(struct mount *mp, void *data);
1631 * List all of the locked vnodes in the system.
1632 * Called when debugging the kernel.
1634 DB_SHOW_COMMAND(lockedvnodes, lockedvnodes)
1636 kprintf("Locked vnodes\n");
1637 mountlist_scan(db_show_locked_vnodes, NULL,
1638 MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
1642 db_show_locked_vnodes(struct mount *mp, void *data __unused)
1646 TAILQ_FOREACH(vp, &mp->mnt_nvnodelist, v_nmntvnodes) {
1647 if (vn_islocked(vp))
1655 * Top level filesystem related information gathering.
1657 static int sysctl_ovfs_conf (SYSCTL_HANDLER_ARGS);
1660 vfs_sysctl(SYSCTL_HANDLER_ARGS)
1662 int *name = (int *)arg1 - 1; /* XXX */
1663 u_int namelen = arg2 + 1; /* XXX */
1664 struct vfsconf *vfsp;
1667 #if 1 || defined(COMPAT_PRELITE2)
1668 /* Resolve ambiguity between VFS_VFSCONF and VFS_GENERIC. */
1670 return (sysctl_ovfs_conf(oidp, arg1, arg2, req));
1674 /* all sysctl names at this level are at least name and field */
1676 return (ENOTDIR); /* overloaded */
1677 if (name[0] != VFS_GENERIC) {
1678 vfsp = vfsconf_find_by_typenum(name[0]);
1680 return (EOPNOTSUPP);
1681 return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1682 oldp, oldlenp, newp, newlen, p));
1686 case VFS_MAXTYPENUM:
1689 maxtypenum = vfsconf_get_maxtypenum();
1690 return (SYSCTL_OUT(req, &maxtypenum, sizeof(maxtypenum)));
1693 return (ENOTDIR); /* overloaded */
1694 vfsp = vfsconf_find_by_typenum(name[2]);
1696 return (EOPNOTSUPP);
1697 return (SYSCTL_OUT(req, vfsp, sizeof *vfsp));
1699 return (EOPNOTSUPP);
1702 SYSCTL_NODE(_vfs, VFS_GENERIC, generic, CTLFLAG_RD, vfs_sysctl,
1703 "Generic filesystem");
1705 #if 1 || defined(COMPAT_PRELITE2)
1708 sysctl_ovfs_conf_iter(struct vfsconf *vfsp, void *data)
1711 struct ovfsconf ovfs;
1712 struct sysctl_req *req = (struct sysctl_req*) data;
1714 bzero(&ovfs, sizeof(ovfs));
1715 ovfs.vfc_vfsops = vfsp->vfc_vfsops; /* XXX used as flag */
1716 strcpy(ovfs.vfc_name, vfsp->vfc_name);
1717 ovfs.vfc_index = vfsp->vfc_typenum;
1718 ovfs.vfc_refcount = vfsp->vfc_refcount;
1719 ovfs.vfc_flags = vfsp->vfc_flags;
1720 error = SYSCTL_OUT(req, &ovfs, sizeof ovfs);
1722 return error; /* abort iteration with error code */
1724 return 0; /* continue iterating with next element */
1728 sysctl_ovfs_conf(SYSCTL_HANDLER_ARGS)
1730 return vfsconf_each(sysctl_ovfs_conf_iter, (void*)req);
1733 #endif /* 1 || COMPAT_PRELITE2 */
1736 * Check to see if a filesystem is mounted on a block device.
1739 vfs_mountedon(struct vnode *vp)
1743 if ((dev = vp->v_rdev) == NULL) {
1744 /* if (vp->v_type != VBLK)
1745 dev = get_dev(vp->v_uminor, vp->v_umajor); */
1747 if (dev != NULL && dev->si_mountpoint)
1753 * Unmount all filesystems. The list is traversed in reverse order
1754 * of mounting to avoid dependencies.
1757 static int vfs_umountall_callback(struct mount *mp, void *data);
1760 vfs_unmountall(void)
1765 count = mountlist_scan(vfs_umountall_callback,
1766 NULL, MNTSCAN_REVERSE|MNTSCAN_NOBUSY);
1772 vfs_umountall_callback(struct mount *mp, void *data)
1776 error = dounmount(mp, MNT_FORCE);
1778 mountlist_remove(mp);
1779 kprintf("unmount of filesystem mounted from %s failed (",
1780 mp->mnt_stat.f_mntfromname);
1784 kprintf("%d)\n", error);
1790 * Checks the mount flags for parameter mp and put the names comma-separated
1791 * into a string buffer buf with a size limit specified by len.
1793 * It returns the number of bytes written into buf, and (*errorp) will be
1794 * set to 0, EINVAL (if passed length is 0), or ENOSPC (supplied buffer was
1795 * not large enough). The buffer will be 0-terminated if len was not 0.
1798 vfs_flagstostr(int flags, const struct mountctl_opt *optp,
1799 char *buf, size_t len, int *errorp)
1801 static const struct mountctl_opt optnames[] = {
1802 { MNT_ASYNC, "asynchronous" },
1803 { MNT_EXPORTED, "NFS exported" },
1804 { MNT_LOCAL, "local" },
1805 { MNT_NOATIME, "noatime" },
1806 { MNT_NODEV, "nodev" },
1807 { MNT_NOEXEC, "noexec" },
1808 { MNT_NOSUID, "nosuid" },
1809 { MNT_NOSYMFOLLOW, "nosymfollow" },
1810 { MNT_QUOTA, "with-quotas" },
1811 { MNT_RDONLY, "read-only" },
1812 { MNT_SYNCHRONOUS, "synchronous" },
1813 { MNT_UNION, "union" },
1814 { MNT_NOCLUSTERR, "noclusterr" },
1815 { MNT_NOCLUSTERW, "noclusterw" },
1816 { MNT_SUIDDIR, "suiddir" },
1817 { MNT_SOFTDEP, "soft-updates" },
1818 { MNT_IGNORE, "ignore" },
1828 bleft = len - 1; /* leave room for trailing \0 */
1831 * Checks the size of the string. If it contains
1832 * any data, then we will append the new flags to
1835 actsize = strlen(buf);
1839 /* Default flags if no flags passed */
1843 if (bleft < 0) { /* degenerate case, 0-length buffer */
1848 for (; flags && optp->o_opt; ++optp) {
1849 if ((flags & optp->o_opt) == 0)
1851 optlen = strlen(optp->o_name);
1852 if (bwritten || actsize > 0) {
1857 buf[bwritten++] = ',';
1858 buf[bwritten++] = ' ';
1861 if (bleft < optlen) {
1865 bcopy(optp->o_name, buf + bwritten, optlen);
1868 flags &= ~optp->o_opt;
1872 * Space already reserved for trailing \0
1879 * Build hash lists of net addresses and hang them off the mount point.
1880 * Called by ufs_mount() to set up the lists of export addresses.
1883 vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1884 const struct export_args *argp)
1887 struct radix_node_head *rnh;
1889 struct radix_node *rn;
1890 struct sockaddr *saddr, *smask = 0;
1894 if (argp->ex_addrlen == 0) {
1895 if (mp->mnt_flag & MNT_DEFEXPORTED)
1897 np = &nep->ne_defexported;
1898 np->netc_exflags = argp->ex_flags;
1899 np->netc_anon = argp->ex_anon;
1900 np->netc_anon.cr_ref = 1;
1901 mp->mnt_flag |= MNT_DEFEXPORTED;
1905 if (argp->ex_addrlen < 0 || argp->ex_addrlen > MLEN)
1907 if (argp->ex_masklen < 0 || argp->ex_masklen > MLEN)
1910 i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1911 np = (struct netcred *) kmalloc(i, M_NETADDR, M_WAITOK | M_ZERO);
1912 saddr = (struct sockaddr *) (np + 1);
1913 if ((error = copyin(argp->ex_addr, (caddr_t) saddr, argp->ex_addrlen)))
1915 if (saddr->sa_len > argp->ex_addrlen)
1916 saddr->sa_len = argp->ex_addrlen;
1917 if (argp->ex_masklen) {
1918 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1919 error = copyin(argp->ex_mask, (caddr_t)smask, argp->ex_masklen);
1922 if (smask->sa_len > argp->ex_masklen)
1923 smask->sa_len = argp->ex_masklen;
1925 i = saddr->sa_family;
1926 if ((rnh = nep->ne_rtable[i]) == 0) {
1928 * Seems silly to initialize every AF when most are not used,
1929 * do so on demand here
1931 SLIST_FOREACH(dom, &domains, dom_next)
1932 if (dom->dom_family == i && dom->dom_rtattach) {
1933 dom->dom_rtattach((void **) &nep->ne_rtable[i],
1937 if ((rnh = nep->ne_rtable[i]) == 0) {
1942 rn = (*rnh->rnh_addaddr) ((char *) saddr, (char *) smask, rnh,
1944 if (rn == 0 || np != (struct netcred *) rn) { /* already exists */
1948 np->netc_exflags = argp->ex_flags;
1949 np->netc_anon = argp->ex_anon;
1950 np->netc_anon.cr_ref = 1;
1953 kfree(np, M_NETADDR);
1959 vfs_free_netcred(struct radix_node *rn, void *w)
1961 struct radix_node_head *rnh = (struct radix_node_head *) w;
1963 (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
1964 kfree((caddr_t) rn, M_NETADDR);
1969 * Free the net address hash lists that are hanging off the mount points.
1972 vfs_free_addrlist(struct netexport *nep)
1975 struct radix_node_head *rnh;
1977 for (i = 0; i <= AF_MAX; i++)
1978 if ((rnh = nep->ne_rtable[i])) {
1979 (*rnh->rnh_walktree) (rnh, vfs_free_netcred,
1981 kfree((caddr_t) rnh, M_RTABLE);
1982 nep->ne_rtable[i] = 0;
1987 vfs_export(struct mount *mp, struct netexport *nep,
1988 const struct export_args *argp)
1992 if (argp->ex_flags & MNT_DELEXPORT) {
1993 if (mp->mnt_flag & MNT_EXPUBLIC) {
1994 vfs_setpublicfs(NULL, NULL, NULL);
1995 mp->mnt_flag &= ~MNT_EXPUBLIC;
1997 vfs_free_addrlist(nep);
1998 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
2000 if (argp->ex_flags & MNT_EXPORTED) {
2001 if (argp->ex_flags & MNT_EXPUBLIC) {
2002 if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
2004 mp->mnt_flag |= MNT_EXPUBLIC;
2006 if ((error = vfs_hang_addrlist(mp, nep, argp)))
2008 mp->mnt_flag |= MNT_EXPORTED;
2015 * Set the publicly exported filesystem (WebNFS). Currently, only
2016 * one public filesystem is possible in the spec (RFC 2054 and 2055)
2019 vfs_setpublicfs(struct mount *mp, struct netexport *nep,
2020 const struct export_args *argp)
2027 * mp == NULL -> invalidate the current info, the FS is
2028 * no longer exported. May be called from either vfs_export
2029 * or unmount, so check if it hasn't already been done.
2032 if (nfs_pub.np_valid) {
2033 nfs_pub.np_valid = 0;
2034 if (nfs_pub.np_index != NULL) {
2035 FREE(nfs_pub.np_index, M_TEMP);
2036 nfs_pub.np_index = NULL;
2043 * Only one allowed at a time.
2045 if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
2049 * Get real filehandle for root of exported FS.
2051 bzero((caddr_t)&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
2052 nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
2054 if ((error = VFS_ROOT(mp, &rvp)))
2057 if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
2063 * If an indexfile was specified, pull it in.
2065 if (argp->ex_indexfile != NULL) {
2068 error = vn_get_namelen(rvp, &namelen);
2071 MALLOC(nfs_pub.np_index, char *, namelen, M_TEMP,
2073 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
2077 * Check for illegal filenames.
2079 for (cp = nfs_pub.np_index; *cp; cp++) {
2087 FREE(nfs_pub.np_index, M_TEMP);
2092 nfs_pub.np_mount = mp;
2093 nfs_pub.np_valid = 1;
2098 vfs_export_lookup(struct mount *mp, struct netexport *nep,
2099 struct sockaddr *nam)
2102 struct radix_node_head *rnh;
2103 struct sockaddr *saddr;
2106 if (mp->mnt_flag & MNT_EXPORTED) {
2108 * Lookup in the export list first.
2112 rnh = nep->ne_rtable[saddr->sa_family];
2114 np = (struct netcred *)
2115 (*rnh->rnh_matchaddr)((char *)saddr,
2117 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
2122 * If no address match, use the default if it exists.
2124 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
2125 np = &nep->ne_defexported;
2131 * perform msync on all vnodes under a mount point. The mount point must
2132 * be locked. This code is also responsible for lazy-freeing unreferenced
2133 * vnodes whos VM objects no longer contain pages.
2135 * NOTE: MNT_WAIT still skips vnodes in the VXLOCK state.
2137 * NOTE: XXX VOP_PUTPAGES and friends requires that the vnode be locked,
2138 * but vnode_pager_putpages() doesn't lock the vnode. We have to do it
2139 * way up in this high level function.
2141 static int vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data);
2142 static int vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data);
2145 vfs_msync(struct mount *mp, int flags)
2150 * tmpfs sets this flag to prevent msync(), sync, and the
2151 * filesystem periodic syncer from trying to flush VM pages
2152 * to swap. Only pure memory pressure flushes tmpfs VM pages
2155 if (mp->mnt_kern_flag & MNTK_NOMSYNC)
2159 * Ok, scan the vnodes for work.
2161 vmsc_flags = VMSC_GETVP;
2162 if (flags != MNT_WAIT)
2163 vmsc_flags |= VMSC_NOWAIT;
2164 vmntvnodescan(mp, vmsc_flags, vfs_msync_scan1, vfs_msync_scan2,
2165 (void *)(intptr_t)flags);
2169 * scan1 is a fast pre-check. There could be hundreds of thousands of
2170 * vnodes, we cannot afford to do anything heavy weight until we have a
2171 * fairly good indication that there is work to do.
2175 vfs_msync_scan1(struct mount *mp, struct vnode *vp, void *data)
2177 int flags = (int)(intptr_t)data;
2179 if ((vp->v_flag & VRECLAIMED) == 0) {
2180 if (vshouldmsync(vp))
2181 return(0); /* call scan2 */
2182 if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
2183 (vp->v_flag & VOBJDIRTY) &&
2184 (flags == MNT_WAIT || vn_islocked(vp) == 0)) {
2185 return(0); /* call scan2 */
2190 * do not call scan2, continue the loop
2196 * This callback is handed a locked vnode.
2200 vfs_msync_scan2(struct mount *mp, struct vnode *vp, void *data)
2203 int flags = (int)(intptr_t)data;
2205 if (vp->v_flag & VRECLAIMED)
2208 if ((mp->mnt_flag & MNT_RDONLY) == 0 && (vp->v_flag & VOBJDIRTY)) {
2209 if ((obj = vp->v_object) != NULL) {
2210 vm_object_page_clean(obj, 0, 0,
2211 flags == MNT_WAIT ? OBJPC_SYNC : OBJPC_NOSYNC);
2218 * Wake up anyone interested in vp because it is being revoked.
2221 vn_gone(struct vnode *vp)
2223 lwkt_gettoken(&vp->v_token);
2224 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, NOTE_REVOKE);
2225 lwkt_reltoken(&vp->v_token);
2229 * extract the cdev_t from a VBLK or VCHR. The vnode must have been opened
2230 * (or v_rdev might be NULL).
2233 vn_todev(struct vnode *vp)
2235 if (vp->v_type != VBLK && vp->v_type != VCHR)
2237 KKASSERT(vp->v_rdev != NULL);
2238 return (vp->v_rdev);
2242 * Check if vnode represents a disk device. The vnode does not need to be
2248 vn_isdisk(struct vnode *vp, int *errp)
2252 if (vp->v_type != VCHR) {
2265 if (dev_is_good(dev) == 0) {
2270 if ((dev_dflags(dev) & D_DISK) == 0) {
2281 vn_get_namelen(struct vnode *vp, int *namelen)
2284 register_t retval[2];
2286 error = VOP_PATHCONF(vp, _PC_NAME_MAX, retval);
2289 *namelen = (int)retval[0];
2294 vop_write_dirent(int *error, struct uio *uio, ino_t d_ino, uint8_t d_type,
2295 uint16_t d_namlen, const char *d_name)
2300 len = _DIRENT_RECLEN(d_namlen);
2301 if (len > uio->uio_resid)
2304 dp = kmalloc(len, M_TEMP, M_WAITOK | M_ZERO);
2307 dp->d_namlen = d_namlen;
2308 dp->d_type = d_type;
2309 bcopy(d_name, dp->d_name, d_namlen);
2311 *error = uiomove((caddr_t)dp, len, uio);
2319 vn_mark_atime(struct vnode *vp, struct thread *td)
2321 struct proc *p = td->td_proc;
2322 struct ucred *cred = p ? p->p_ucred : proc0.p_ucred;
2324 if ((vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0) {
2325 VOP_MARKATIME(vp, cred);