2 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
30 * $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $
34 * tmpfs vnode interface.
37 #include <sys/kernel.h>
38 #include <sys/kern_syscall.h>
39 #include <sys/param.h>
40 #include <sys/fcntl.h>
41 #include <sys/lockf.h>
44 #include <sys/resourcevar.h>
45 #include <sys/sched.h>
47 #include <sys/systm.h>
48 #include <sys/unistd.h>
49 #include <sys/vfsops.h>
50 #include <sys/vnode.h>
51 #include <sys/mountctl.h>
54 #include <vm/vm_extern.h>
55 #include <vm/vm_object.h>
56 #include <vm/vm_page.h>
57 #include <vm/vm_pageout.h>
58 #include <vm/vm_pager.h>
59 #include <vm/swap_pager.h>
62 #include <vm/vm_page2.h>
64 #include <vfs/fifofs/fifo.h>
65 #include <vfs/tmpfs/tmpfs_vnops.h>
68 static void tmpfs_strategy_done(struct bio *bio);
72 tmpfs_knote(struct vnode *vp, int flags)
75 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
79 /* --------------------------------------------------------------------- */
82 tmpfs_nresolve(struct vop_nresolve_args *v)
84 struct vnode *dvp = v->a_dvp;
85 struct vnode *vp = NULL;
86 struct namecache *ncp = v->a_nch->ncp;
87 struct tmpfs_node *tnode;
89 struct tmpfs_dirent *de;
90 struct tmpfs_node *dnode;
95 dnode = VP_TO_TMPFS_DIR(dvp);
97 TMPFS_NODE_LOCK_SH(dnode);
98 de = tmpfs_dir_lookup(dnode, NULL, ncp);
103 * Allocate a vnode for the node we found.
106 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
107 LK_EXCLUSIVE | LK_RETRY, &vp);
114 TMPFS_NODE_UNLOCK(dnode);
116 if ((dnode->tn_status & TMPFS_NODE_ACCESSED) == 0) {
117 TMPFS_NODE_LOCK(dnode);
118 dnode->tn_status |= TMPFS_NODE_ACCESSED;
119 TMPFS_NODE_UNLOCK(dnode);
123 * Store the result of this lookup in the cache. Avoid this if the
124 * request was for creation, as it does not improve timings on
129 cache_setvp(v->a_nch, vp);
131 } else if (error == ENOENT) {
132 cache_setvp(v->a_nch, NULL);
138 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v)
140 struct vnode *dvp = v->a_dvp;
141 struct vnode **vpp = v->a_vpp;
142 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp);
143 struct ucred *cred = v->a_cred;
151 /* Check accessibility of requested node as a first step. */
152 error = VOP_ACCESS(dvp, VEXEC, cred);
156 if (dnode->tn_dir.tn_parent != NULL) {
157 /* Allocate a new vnode on the matching entry. */
158 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
159 LK_EXCLUSIVE | LK_RETRY, vpp);
164 return (*vpp == NULL) ? ENOENT : 0;
167 /* --------------------------------------------------------------------- */
170 tmpfs_ncreate(struct vop_ncreate_args *v)
172 struct vnode *dvp = v->a_dvp;
173 struct vnode **vpp = v->a_vpp;
174 struct namecache *ncp = v->a_nch->ncp;
175 struct vattr *vap = v->a_vap;
176 struct ucred *cred = v->a_cred;
182 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK);
184 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
186 cache_setunresolved(v->a_nch);
187 cache_setvp(v->a_nch, *vpp);
188 tmpfs_knote(dvp, NOTE_WRITE);
192 /* --------------------------------------------------------------------- */
195 tmpfs_nmknod(struct vop_nmknod_args *v)
197 struct vnode *dvp = v->a_dvp;
198 struct vnode **vpp = v->a_vpp;
199 struct namecache *ncp = v->a_nch->ncp;
200 struct vattr *vap = v->a_vap;
201 struct ucred *cred = v->a_cred;
204 if (vap->va_type != VBLK && vap->va_type != VCHR &&
205 vap->va_type != VFIFO) {
209 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
211 cache_setunresolved(v->a_nch);
212 cache_setvp(v->a_nch, *vpp);
213 tmpfs_knote(dvp, NOTE_WRITE);
218 /* --------------------------------------------------------------------- */
221 tmpfs_open(struct vop_open_args *v)
223 struct vnode *vp = v->a_vp;
224 int mode = v->a_mode;
225 struct tmpfs_node *node;
228 node = VP_TO_TMPFS_NODE(vp);
231 /* The file is still active but all its names have been removed
232 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
233 * it is about to die. */
234 if (node->tn_links < 1)
238 /* If the file is marked append-only, deny write requests. */
239 if ((node->tn_flags & APPEND) &&
240 (mode & (FWRITE | O_APPEND)) == FWRITE) {
243 error = (vop_stdopen(v));
249 /* --------------------------------------------------------------------- */
252 tmpfs_close(struct vop_close_args *v)
254 struct vnode *vp = v->a_vp;
255 struct tmpfs_node *node;
258 node = VP_TO_TMPFS_NODE(vp);
260 if (node->tn_links > 0) {
262 * Update node times. No need to do it if the node has
263 * been deleted, because it will vanish after we return.
268 error = vop_stdclose(v);
273 /* --------------------------------------------------------------------- */
276 tmpfs_access(struct vop_access_args *v)
278 struct vnode *vp = v->a_vp;
280 struct tmpfs_node *node;
282 node = VP_TO_TMPFS_NODE(vp);
284 switch (vp->v_type) {
290 if ((v->a_mode & VWRITE) &&
291 (vp->v_mount->mnt_flag & MNT_RDONLY)) {
311 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) {
316 error = vop_helper_access(v, node->tn_uid, node->tn_gid,
322 /* --------------------------------------------------------------------- */
325 tmpfs_getattr(struct vop_getattr_args *v)
327 struct vnode *vp = v->a_vp;
328 struct vattr *vap = v->a_vap;
329 struct tmpfs_node *node;
331 node = VP_TO_TMPFS_NODE(vp);
335 TMPFS_NODE_LOCK_SH(node);
336 vap->va_type = vp->v_type;
337 vap->va_mode = node->tn_mode;
338 vap->va_nlink = node->tn_links;
339 vap->va_uid = node->tn_uid;
340 vap->va_gid = node->tn_gid;
341 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
342 vap->va_fileid = node->tn_id;
343 vap->va_size = node->tn_size;
344 vap->va_blocksize = PAGE_SIZE;
345 vap->va_atime.tv_sec = node->tn_atime;
346 vap->va_atime.tv_nsec = node->tn_atimensec;
347 vap->va_mtime.tv_sec = node->tn_mtime;
348 vap->va_mtime.tv_nsec = node->tn_mtimensec;
349 vap->va_ctime.tv_sec = node->tn_ctime;
350 vap->va_ctime.tv_nsec = node->tn_ctimensec;
351 vap->va_gen = node->tn_gen;
352 vap->va_flags = node->tn_flags;
353 if (vp->v_type == VBLK || vp->v_type == VCHR) {
354 vap->va_rmajor = umajor(node->tn_rdev);
355 vap->va_rminor = uminor(node->tn_rdev);
357 vap->va_bytes = round_page(node->tn_size);
359 TMPFS_NODE_UNLOCK(node);
364 /* --------------------------------------------------------------------- */
367 tmpfs_setattr(struct vop_setattr_args *v)
369 struct vnode *vp = v->a_vp;
370 struct vattr *vap = v->a_vap;
371 struct ucred *cred = v->a_cred;
372 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp);
376 TMPFS_NODE_LOCK(node);
377 if (error == 0 && (vap->va_flags != VNOVAL)) {
378 error = tmpfs_chflags(vp, vap->va_flags, cred);
379 kflags |= NOTE_ATTRIB;
382 if (error == 0 && (vap->va_size != VNOVAL)) {
383 if (vap->va_size > node->tn_size)
384 kflags |= NOTE_WRITE | NOTE_EXTEND;
386 kflags |= NOTE_WRITE;
387 error = tmpfs_chsize(vp, vap->va_size, cred);
390 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL ||
391 vap->va_gid != (gid_t)VNOVAL)) {
392 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred);
393 kflags |= NOTE_ATTRIB;
396 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) {
397 error = tmpfs_chmod(vp, vap->va_mode, cred);
398 kflags |= NOTE_ATTRIB;
401 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
402 vap->va_atime.tv_nsec != VNOVAL) ||
403 (vap->va_mtime.tv_sec != VNOVAL &&
404 vap->va_mtime.tv_nsec != VNOVAL) )) {
405 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
406 vap->va_vaflags, cred);
407 kflags |= NOTE_ATTRIB;
411 * Update the node times. We give preference to the error codes
412 * generated by this function rather than the ones that may arise
416 TMPFS_NODE_UNLOCK(node);
417 tmpfs_knote(vp, kflags);
422 /* --------------------------------------------------------------------- */
425 * fsync is usually a NOP, but we must take action when unmounting or
429 tmpfs_fsync(struct vop_fsync_args *v)
431 struct tmpfs_node *node;
432 struct vnode *vp = v->a_vp;
434 node = VP_TO_TMPFS_NODE(vp);
437 if (vp->v_type == VREG) {
438 if (vp->v_flag & VRECLAIMED) {
439 if (node->tn_links == 0)
440 tmpfs_truncate(vp, 0);
442 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL);
448 /* --------------------------------------------------------------------- */
451 tmpfs_read (struct vop_read_args *ap)
454 struct vnode *vp = ap->a_vp;
455 struct uio *uio = ap->a_uio;
456 struct tmpfs_node *node;
466 if (uio->uio_offset < 0)
468 if (vp->v_type != VREG)
472 * Extract node, try to shortcut the operation through
473 * the VM page cache, allowing us to avoid buffer cache
476 node = VP_TO_TMPFS_NODE(vp);
477 resid = uio->uio_resid;
478 error = vop_helper_read_shortcut(ap);
481 if (uio->uio_resid == 0) {
488 * Fall-through to our normal read code.
490 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) {
492 * Use buffer cache I/O (via tmpfs_strategy)
494 offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64;
495 base_offset = (off_t)uio->uio_offset - offset;
496 bp = getcacheblk(vp, base_offset, TMPFS_BLKSIZE, 0);
498 error = bread(vp, base_offset, TMPFS_BLKSIZE, &bp);
501 kprintf("tmpfs_read bread error %d\n", error);
506 * tmpfs pretty much fiddles directly with the VM
507 * system, don't let it exhaust it or we won't play
508 * nice with other processes.
510 * Only do this if the VOP is coming from a normal
511 * read/write. The VM system handles the case for
514 if (uio->uio_segflg != UIO_NOCOPY)
517 bp->b_flags |= B_CLUSTEROK;
520 * Figure out how many bytes we can actually copy this loop.
522 len = TMPFS_BLKSIZE - offset;
523 if (len > uio->uio_resid)
524 len = uio->uio_resid;
525 if (len > node->tn_size - uio->uio_offset)
526 len = (size_t)(node->tn_size - uio->uio_offset);
528 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio);
531 kprintf("tmpfs_read uiomove error %d\n", error);
537 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) {
538 TMPFS_NODE_LOCK(node);
539 node->tn_status |= TMPFS_NODE_ACCESSED;
540 TMPFS_NODE_UNLOCK(node);
546 tmpfs_write (struct vop_write_args *ap)
549 struct vnode *vp = ap->a_vp;
550 struct uio *uio = ap->a_uio;
551 struct thread *td = uio->uio_td;
552 struct tmpfs_node *node;
565 if (uio->uio_resid == 0) {
569 node = VP_TO_TMPFS_NODE(vp);
571 if (vp->v_type != VREG)
573 seqcount = ap->a_ioflag >> 16;
575 TMPFS_NODE_LOCK(node);
577 oldsize = node->tn_size;
578 if (ap->a_ioflag & IO_APPEND)
579 uio->uio_offset = node->tn_size;
582 * Check for illegal write offsets.
584 if (uio->uio_offset + uio->uio_resid >
585 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) {
591 * NOTE: Ignore if UIO does not come from a user thread (e.g. VN).
593 if (vp->v_type == VREG && td != NULL && td->td_lwp != NULL) {
594 error = kern_getrlimit(RLIMIT_FSIZE, &limit);
597 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) {
598 ksignal(td->td_proc, SIGXFSZ);
605 * Extend the file's size if necessary
607 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size);
609 while (uio->uio_resid > 0) {
611 * Don't completely blow out running buffer I/O
612 * when being hit from the pageout daemon.
614 if (uio->uio_segflg == UIO_NOCOPY &&
615 (ap->a_ioflag & IO_RECURSE) == 0) {
616 bwillwrite(TMPFS_BLKSIZE);
620 * Use buffer cache I/O (via tmpfs_strategy)
622 offset = (size_t)uio->uio_offset & TMPFS_BLKMASK64;
623 base_offset = (off_t)uio->uio_offset - offset;
624 len = TMPFS_BLKSIZE - offset;
625 if (len > uio->uio_resid)
626 len = uio->uio_resid;
628 if ((uio->uio_offset + len) > node->tn_size) {
629 trivial = (uio->uio_offset <= node->tn_size);
630 error = tmpfs_reg_resize(vp, uio->uio_offset + len,
637 * Read to fill in any gaps. Theoretically we could
638 * optimize this if the write covers the entire buffer
639 * and is not a UIO_NOCOPY write, however this can lead
640 * to a security violation exposing random kernel memory
641 * (whatever junk was in the backing VM pages before).
643 * So just use bread() to do the right thing.
645 error = bread(vp, base_offset, TMPFS_BLKSIZE, &bp);
646 error = uiomovebp(bp, (char *)bp->b_data + offset, len, uio);
648 kprintf("tmpfs_write uiomove error %d\n", error);
653 if (uio->uio_offset > node->tn_size) {
654 node->tn_size = uio->uio_offset;
655 kflags |= NOTE_EXTEND;
657 kflags |= NOTE_WRITE;
660 * Always try to flush the page in the UIO_NOCOPY case. This
661 * can come from the pageout daemon or during vnode eviction.
662 * It is not necessarily going to be marked IO_ASYNC/IO_SYNC.
664 * For the normal case we buwrite(), dirtying the underlying
665 * VM pages instead of dirtying the buffer and releasing the
666 * buffer as a clean buffer. This allows tmpfs to use
667 * essentially all available memory to cache file data.
668 * If we used bdwrite() the buffer cache would wind up
669 * flushing the data to swap too quickly.
671 * But because tmpfs can seriously load the VM system we
672 * fall-back to using bdwrite() when free memory starts
673 * to get low. This shifts the load away from the VM system
674 * and makes tmpfs act more like a normal filesystem with
675 * regards to disk activity.
677 * tmpfs pretty much fiddles directly with the VM
678 * system, don't let it exhaust it or we won't play
679 * nice with other processes. Only do this if the
680 * VOP is coming from a normal read/write. The VM system
681 * handles the case for UIO_NOCOPY.
683 bp->b_flags |= B_CLUSTEROK;
684 if (uio->uio_segflg == UIO_NOCOPY) {
686 * Flush from the pageout daemon, deal with
687 * potentially very heavy tmpfs write activity
688 * causing long stalls in the pageout daemon
689 * before pages get to free/cache.
691 * (a) Under severe pressure setting B_DIRECT will
692 * cause a buffer release to try to free the
695 * (b) Under modest memory pressure the B_RELBUF
696 * alone is sufficient to get the pages moved
697 * to the cache. We could also force this by
698 * setting B_NOTMETA but that might have other
699 * unintended side-effects (e.g. setting
700 * PG_NOTMETA on the VM page).
702 * Hopefully this will unblock the VM system more
703 * quickly under extreme tmpfs write load.
705 if (vm_page_count_min(vm_page_free_hysteresis))
706 bp->b_flags |= B_DIRECT;
707 bp->b_flags |= B_AGE | B_RELBUF;
708 bp->b_act_count = 0; /* buffer->deactivate pgs */
710 } else if (vm_page_count_target()) {
712 * Normal (userland) write but we are low on memory,
713 * run the buffer the buffer cache.
715 bp->b_act_count = 0; /* buffer->deactivate pgs */
719 * Otherwise run the buffer directly through to the
723 /*vm_wait_nominal();*/
727 kprintf("tmpfs_write bwrite error %d\n", bp->b_error);
734 (void)tmpfs_reg_resize(vp, oldsize, trivial);
735 kflags &= ~NOTE_EXTEND;
741 * Currently we don't set the mtime on files modified via mmap()
742 * because we can't tell the difference between those modifications
743 * and an attempt by the pageout daemon to flush tmpfs pages to
746 * This is because in order to defer flushes as long as possible
747 * buwrite() works by marking the underlying VM pages dirty in
748 * order to be able to dispose of the buffer cache buffer without
751 if (uio->uio_segflg != UIO_NOCOPY)
752 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED;
754 node->tn_status |= TMPFS_NODE_CHANGED;
756 if (node->tn_mode & (S_ISUID | S_ISGID)) {
757 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
758 node->tn_mode &= ~(S_ISUID | S_ISGID);
761 TMPFS_NODE_UNLOCK(node);
763 tmpfs_knote(vp, kflags);
769 tmpfs_advlock (struct vop_advlock_args *ap)
771 struct tmpfs_node *node;
772 struct vnode *vp = ap->a_vp;
775 node = VP_TO_TMPFS_NODE(vp);
776 error = (lf_advlock(ap, &node->tn_advlock, node->tn_size));
782 * The strategy function is typically only called when memory pressure
783 * forces the system to attempt to pageout pages. It can also be called
784 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write
788 tmpfs_strategy(struct vop_strategy_args *ap)
790 struct bio *bio = ap->a_bio;
792 struct buf *bp = bio->bio_buf;
793 struct vnode *vp = ap->a_vp;
794 struct tmpfs_node *node;
799 if (vp->v_type != VREG) {
800 bp->b_resid = bp->b_bcount;
801 bp->b_flags |= B_ERROR | B_INVAL;
802 bp->b_error = EINVAL;
807 node = VP_TO_TMPFS_NODE(vp);
809 uobj = node->tn_reg.tn_aobj;
812 * Don't bother flushing to swap if there is no swap, just
813 * ensure that the pages are marked as needing a commit (still).
815 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) {
816 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
817 m = bp->b_xio.xio_pages[i];
818 vm_page_need_commit(m);
824 nbio = push_bio(bio);
825 nbio->bio_done = tmpfs_strategy_done;
826 nbio->bio_offset = bio->bio_offset;
827 swap_pager_strategy(uobj, nbio);
833 * If we were unable to commit the pages to swap make sure they are marked
834 * as needing a commit (again). If we were, clear the flag to allow the
838 tmpfs_strategy_done(struct bio *bio)
846 if (bp->b_flags & B_ERROR) {
847 bp->b_flags &= ~B_ERROR;
850 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
851 m = bp->b_xio.xio_pages[i];
852 vm_page_need_commit(m);
855 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
856 m = bp->b_xio.xio_pages[i];
857 vm_page_clear_commit(m);
865 tmpfs_bmap(struct vop_bmap_args *ap)
867 if (ap->a_doffsetp != NULL)
868 *ap->a_doffsetp = ap->a_loffset;
869 if (ap->a_runp != NULL)
871 if (ap->a_runb != NULL)
877 /* --------------------------------------------------------------------- */
880 tmpfs_nremove(struct vop_nremove_args *v)
882 struct vnode *dvp = v->a_dvp;
883 struct namecache *ncp = v->a_nch->ncp;
886 struct tmpfs_dirent *de;
887 struct tmpfs_mount *tmp;
888 struct tmpfs_node *dnode;
889 struct tmpfs_node *node;
895 * We have to acquire the vp from v->a_nch because we will likely
896 * unresolve the namecache entry, and a vrele/vput is needed to
897 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
899 * We have to use vget to clear any inactive state on the vnode,
900 * otherwise the vnode may remain inactive and thus tmpfs_inactive
901 * will not get called when we release it.
903 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
904 KKASSERT(vp->v_mount == dvp->v_mount);
905 KKASSERT(error == 0);
908 if (vp->v_type == VDIR) {
913 dnode = VP_TO_TMPFS_DIR(dvp);
914 node = VP_TO_TMPFS_NODE(vp);
915 tmp = VFS_TO_TMPFS(vp->v_mount);
917 TMPFS_NODE_LOCK(dnode);
918 de = tmpfs_dir_lookup(dnode, node, ncp);
924 /* Files marked as immutable or append-only cannot be deleted. */
925 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
926 (dnode->tn_flags & APPEND)) {
931 /* Remove the entry from the directory; as it is a file, we do not
932 * have to change the number of hard links of the directory. */
933 tmpfs_dir_detach(dnode, de);
935 /* Free the directory entry we just deleted. Note that the node
936 * referred by it will not be removed until the vnode is really
938 tmpfs_free_dirent(tmp, de);
940 if (node->tn_links > 0) {
941 TMPFS_NODE_LOCK(node);
942 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
944 TMPFS_NODE_UNLOCK(node);
947 cache_unlink(v->a_nch);
948 tmpfs_knote(vp, NOTE_DELETE);
952 TMPFS_NODE_UNLOCK(dnode);
954 tmpfs_knote(dvp, NOTE_WRITE);
961 /* --------------------------------------------------------------------- */
964 tmpfs_nlink(struct vop_nlink_args *v)
966 struct vnode *dvp = v->a_dvp;
967 struct vnode *vp = v->a_vp;
968 struct namecache *ncp = v->a_nch->ncp;
969 struct tmpfs_dirent *de;
970 struct tmpfs_node *node;
971 struct tmpfs_node *dnode;
977 KKASSERT(dvp != vp); /* XXX When can this be false? */
979 node = VP_TO_TMPFS_NODE(vp);
980 dnode = VP_TO_TMPFS_NODE(dvp);
981 TMPFS_NODE_LOCK(dnode);
983 /* XXX: Why aren't the following two tests done by the caller? */
985 /* Hard links of directories are forbidden. */
986 if (vp->v_type == VDIR) {
991 /* Cannot create cross-device links. */
992 if (dvp->v_mount != vp->v_mount) {
997 /* Ensure that we do not overflow the maximum number of links imposed
999 KKASSERT(node->tn_links <= LINK_MAX);
1000 if (node->tn_links >= LINK_MAX) {
1005 /* We cannot create links of files marked immutable or append-only. */
1006 if (node->tn_flags & (IMMUTABLE | APPEND)) {
1011 /* Allocate a new directory entry to represent the node. */
1012 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
1013 ncp->nc_name, ncp->nc_nlen, &de);
1017 /* Insert the new directory entry into the appropriate directory. */
1018 tmpfs_dir_attach(dnode, de);
1020 /* vp link count has changed, so update node times. */
1022 TMPFS_NODE_LOCK(node);
1023 node->tn_status |= TMPFS_NODE_CHANGED;
1024 TMPFS_NODE_UNLOCK(node);
1027 tmpfs_knote(vp, NOTE_LINK);
1028 cache_setunresolved(v->a_nch);
1029 cache_setvp(v->a_nch, vp);
1033 TMPFS_NODE_UNLOCK(dnode);
1035 tmpfs_knote(dvp, NOTE_WRITE);
1039 /* --------------------------------------------------------------------- */
1042 tmpfs_nrename(struct vop_nrename_args *v)
1044 struct vnode *fdvp = v->a_fdvp;
1045 struct namecache *fncp = v->a_fnch->ncp;
1046 struct vnode *fvp = fncp->nc_vp;
1047 struct vnode *tdvp = v->a_tdvp;
1048 struct namecache *tncp = v->a_tnch->ncp;
1050 struct tmpfs_dirent *de, *tde;
1051 struct tmpfs_mount *tmp;
1052 struct tmpfs_node *fdnode;
1053 struct tmpfs_node *fnode;
1054 struct tmpfs_node *tnode;
1055 struct tmpfs_node *tdnode;
1062 KKASSERT(fdvp->v_mount == fvp->v_mount);
1065 * Because tvp can get overwritten we have to vget it instead of
1066 * just vref or use it, otherwise it's VINACTIVE flag may not get
1067 * cleared and the node won't get destroyed.
1069 error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp);
1071 tnode = VP_TO_TMPFS_NODE(tvp);
1077 /* Disallow cross-device renames.
1078 * XXX Why isn't this done by the caller? */
1079 if (fvp->v_mount != tdvp->v_mount ||
1080 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
1085 tmp = VFS_TO_TMPFS(tdvp->v_mount);
1086 tdnode = VP_TO_TMPFS_DIR(tdvp);
1088 /* If source and target are the same file, there is nothing to do. */
1094 fdnode = VP_TO_TMPFS_DIR(fdvp);
1095 fnode = VP_TO_TMPFS_NODE(fvp);
1096 TMPFS_NODE_LOCK(fdnode);
1097 de = tmpfs_dir_lookup(fdnode, fnode, fncp);
1098 TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */
1100 /* Avoid manipulating '.' and '..' entries. */
1105 KKASSERT(de->td_node == fnode);
1108 * If replacing an entry in the target directory and that entry
1109 * is a directory, it must be empty.
1111 * Kern_rename gurantees the destination to be a directory
1112 * if the source is one (it does?).
1115 KKASSERT(tnode != NULL);
1117 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1118 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
1123 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
1124 if (tnode->tn_size > 0) {
1128 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1131 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1135 KKASSERT(fnode->tn_type != VDIR &&
1136 tnode->tn_type != VDIR);
1140 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1141 (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1147 * Ensure that we have enough memory to hold the new name, if it
1148 * has to be changed.
1150 if (fncp->nc_nlen != tncp->nc_nlen ||
1151 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
1152 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone,
1153 M_WAITOK | M_NULLOK);
1154 if (newname == NULL) {
1158 bcopy(tncp->nc_name, newname, tncp->nc_nlen);
1159 newname[tncp->nc_nlen] = '\0';
1165 * Unlink entry from source directory. Note that the kernel has
1166 * already checked for illegal recursion cases (renaming a directory
1167 * into a subdirectory of itself).
1169 if (fdnode != tdnode) {
1170 tmpfs_dir_detach(fdnode, de);
1172 /* XXX depend on namecache lock */
1173 TMPFS_NODE_LOCK(fdnode);
1174 KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp));
1175 RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de);
1176 RB_REMOVE(tmpfs_dirtree_cookie,
1177 &fdnode->tn_dir.tn_cookietree, de);
1178 TMPFS_NODE_UNLOCK(fdnode);
1182 * Handle any name change. Swap with newname, we will
1183 * deallocate it at the end.
1185 if (newname != NULL) {
1187 TMPFS_NODE_LOCK(fnode);
1188 fnode->tn_status |= TMPFS_NODE_CHANGED;
1189 TMPFS_NODE_UNLOCK(fnode);
1191 oldname = de->td_name;
1192 de->td_name = newname;
1193 de->td_namelen = (uint16_t)tncp->nc_nlen;
1198 * If we are overwriting an entry, we have to remove the old one
1199 * from the target directory.
1202 /* Remove the old entry from the target directory. */
1203 TMPFS_NODE_LOCK(tdnode);
1204 tde = tmpfs_dir_lookup(tdnode, tnode, tncp);
1205 tmpfs_dir_detach(tdnode, tde);
1206 TMPFS_NODE_UNLOCK(tdnode);
1207 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE);
1210 * Free the directory entry we just deleted. Note that the
1211 * node referred by it will not be removed until the vnode is
1214 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
1215 /*cache_inval_vp(tvp, CINV_DESTROY);*/
1219 * Link entry to target directory. If the entry
1220 * represents a directory move the parent linkage
1223 if (fdnode != tdnode) {
1224 if (de->td_node->tn_type == VDIR) {
1225 TMPFS_VALIDATE_DIR(fnode);
1227 tmpfs_dir_attach(tdnode, de);
1229 TMPFS_NODE_LOCK(tdnode);
1230 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1231 RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de);
1232 RB_INSERT(tmpfs_dirtree_cookie,
1233 &tdnode->tn_dir.tn_cookietree, de);
1234 TMPFS_NODE_UNLOCK(tdnode);
1241 kfree(newname, tmp->tm_name_zone);
1244 cache_rename(v->a_fnch, v->a_tnch);
1245 tmpfs_knote(v->a_fdvp, NOTE_WRITE);
1246 tmpfs_knote(v->a_tdvp, NOTE_WRITE);
1247 if (fnode->tn_vnode)
1248 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME);
1259 /* --------------------------------------------------------------------- */
1262 tmpfs_nmkdir(struct vop_nmkdir_args *v)
1264 struct vnode *dvp = v->a_dvp;
1265 struct vnode **vpp = v->a_vpp;
1266 struct namecache *ncp = v->a_nch->ncp;
1267 struct vattr *vap = v->a_vap;
1268 struct ucred *cred = v->a_cred;
1274 KKASSERT(vap->va_type == VDIR);
1276 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
1278 cache_setunresolved(v->a_nch);
1279 cache_setvp(v->a_nch, *vpp);
1280 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
1285 /* --------------------------------------------------------------------- */
1288 tmpfs_nrmdir(struct vop_nrmdir_args *v)
1290 struct vnode *dvp = v->a_dvp;
1291 struct namecache *ncp = v->a_nch->ncp;
1293 struct tmpfs_dirent *de;
1294 struct tmpfs_mount *tmp;
1295 struct tmpfs_node *dnode;
1296 struct tmpfs_node *node;
1303 * We have to acquire the vp from v->a_nch because we will likely
1304 * unresolve the namecache entry, and a vrele/vput is needed to
1305 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
1307 * We have to use vget to clear any inactive state on the vnode,
1308 * otherwise the vnode may remain inactive and thus tmpfs_inactive
1309 * will not get called when we release it.
1311 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
1312 KKASSERT(error == 0);
1316 * Prevalidate so we don't hit an assertion later
1318 if (vp->v_type != VDIR) {
1323 tmp = VFS_TO_TMPFS(dvp->v_mount);
1324 dnode = VP_TO_TMPFS_DIR(dvp);
1325 node = VP_TO_TMPFS_DIR(vp);
1328 * Directories with more than two entries ('.' and '..') cannot
1331 if (node->tn_size > 0) {
1336 if ((dnode->tn_flags & APPEND)
1337 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1343 * This invariant holds only if we are not trying to
1344 * remove "..". We checked for that above so this is safe now.
1346 KKASSERT(node->tn_dir.tn_parent == dnode);
1349 * Get the directory entry associated with node (vp). This
1350 * was filled by tmpfs_lookup while looking up the entry.
1352 TMPFS_NODE_LOCK(dnode);
1353 de = tmpfs_dir_lookup(dnode, node, ncp);
1354 KKASSERT(TMPFS_DIRENT_MATCHES(de, ncp->nc_name, ncp->nc_nlen));
1356 /* Check flags to see if we are allowed to remove the directory. */
1357 if ((dnode->tn_flags & APPEND) ||
1358 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1360 TMPFS_NODE_UNLOCK(dnode);
1364 /* Detach the directory entry from the directory (dnode). */
1365 tmpfs_dir_detach(dnode, de);
1366 TMPFS_NODE_UNLOCK(dnode);
1368 /* No vnode should be allocated for this entry from this point */
1369 TMPFS_NODE_LOCK(dnode);
1370 TMPFS_ASSERT_ELOCKED(dnode);
1371 TMPFS_NODE_LOCK(node);
1372 TMPFS_ASSERT_ELOCKED(node);
1375 * Must set parent linkage to NULL (tested by ncreate to disallow
1376 * the creation of new files/dirs in a deleted directory)
1378 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
1379 TMPFS_NODE_MODIFIED;
1381 dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
1382 TMPFS_NODE_MODIFIED;
1384 TMPFS_NODE_UNLOCK(node);
1385 TMPFS_NODE_UNLOCK(dnode);
1387 /* Free the directory entry we just deleted. Note that the node
1388 * referred by it will not be removed until the vnode is really
1390 tmpfs_free_dirent(tmp, de);
1392 /* Release the deleted vnode (will destroy the node, notify
1393 * interested parties and clean it from the cache). */
1395 TMPFS_NODE_LOCK(dnode);
1396 dnode->tn_status |= TMPFS_NODE_CHANGED;
1397 TMPFS_NODE_UNLOCK(dnode);
1400 cache_unlink(v->a_nch);
1401 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
1410 /* --------------------------------------------------------------------- */
1413 tmpfs_nsymlink(struct vop_nsymlink_args *v)
1415 struct vnode *dvp = v->a_dvp;
1416 struct vnode **vpp = v->a_vpp;
1417 struct namecache *ncp = v->a_nch->ncp;
1418 struct vattr *vap = v->a_vap;
1419 struct ucred *cred = v->a_cred;
1420 char *target = v->a_target;
1423 vap->va_type = VLNK;
1424 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
1426 tmpfs_knote(*vpp, NOTE_WRITE);
1427 cache_setunresolved(v->a_nch);
1428 cache_setvp(v->a_nch, *vpp);
1433 /* --------------------------------------------------------------------- */
1436 tmpfs_readdir(struct vop_readdir_args *v)
1438 struct vnode *vp = v->a_vp;
1439 struct uio *uio = v->a_uio;
1440 int *eofflag = v->a_eofflag;
1441 off_t **cookies = v->a_cookies;
1442 int *ncookies = v->a_ncookies;
1443 struct tmpfs_mount *tmp;
1447 struct tmpfs_node *node;
1449 /* This operation only makes sense on directory nodes. */
1450 if (vp->v_type != VDIR) {
1454 tmp = VFS_TO_TMPFS(vp->v_mount);
1455 node = VP_TO_TMPFS_DIR(vp);
1456 startoff = uio->uio_offset;
1458 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1459 error = tmpfs_dir_getdotdent(node, uio);
1461 TMPFS_NODE_LOCK_SH(node);
1467 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1468 /* may lock parent, cannot hold node lock */
1469 error = tmpfs_dir_getdotdotdent(tmp, node, uio);
1471 TMPFS_NODE_LOCK_SH(node);
1477 TMPFS_NODE_LOCK_SH(node);
1478 error = tmpfs_dir_getdents(node, uio, &cnt);
1481 KKASSERT(error >= -1);
1486 if (eofflag != NULL)
1488 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1490 /* Update NFS-related variables. */
1491 if (error == 0 && cookies != NULL && ncookies != NULL) {
1493 off_t off = startoff;
1494 struct tmpfs_dirent *de = NULL;
1497 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1499 for (i = 0; i < cnt; i++) {
1500 KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
1501 if (off == TMPFS_DIRCOOKIE_DOT) {
1502 off = TMPFS_DIRCOOKIE_DOTDOT;
1504 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1505 de = RB_MIN(tmpfs_dirtree_cookie,
1506 &node->tn_dir.tn_cookietree);
1507 } else if (de != NULL) {
1508 de = RB_NEXT(tmpfs_dirtree_cookie,
1509 &node->tn_dir.tn_cookietree, de);
1511 de = tmpfs_dir_lookupbycookie(node,
1513 KKASSERT(de != NULL);
1514 de = RB_NEXT(tmpfs_dirtree_cookie,
1515 &node->tn_dir.tn_cookietree, de);
1518 off = TMPFS_DIRCOOKIE_EOF;
1520 off = tmpfs_dircookie(de);
1522 (*cookies)[i] = off;
1524 KKASSERT(uio->uio_offset == off);
1526 TMPFS_NODE_UNLOCK(node);
1528 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) {
1529 TMPFS_NODE_LOCK(node);
1530 node->tn_status |= TMPFS_NODE_ACCESSED;
1531 TMPFS_NODE_UNLOCK(node);
1536 /* --------------------------------------------------------------------- */
1539 tmpfs_readlink(struct vop_readlink_args *v)
1541 struct vnode *vp = v->a_vp;
1542 struct uio *uio = v->a_uio;
1544 struct tmpfs_node *node;
1546 KKASSERT(uio->uio_offset == 0);
1547 KKASSERT(vp->v_type == VLNK);
1549 node = VP_TO_TMPFS_NODE(vp);
1550 TMPFS_NODE_LOCK_SH(node);
1551 error = uiomove(node->tn_link,
1552 MIN(node->tn_size, uio->uio_resid), uio);
1553 TMPFS_NODE_UNLOCK(node);
1554 if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) {
1555 TMPFS_NODE_LOCK(node);
1556 node->tn_status |= TMPFS_NODE_ACCESSED;
1557 TMPFS_NODE_UNLOCK(node);
1562 /* --------------------------------------------------------------------- */
1565 tmpfs_inactive(struct vop_inactive_args *v)
1567 struct vnode *vp = v->a_vp;
1568 struct tmpfs_node *node;
1572 lwkt_gettoken(&mp->mnt_token);
1573 node = VP_TO_TMPFS_NODE(vp);
1580 lwkt_reltoken(&mp->mnt_token);
1585 * Get rid of unreferenced deleted vnodes sooner rather than
1586 * later so the data memory can be recovered immediately.
1588 * We must truncate the vnode to prevent the normal reclamation
1589 * path from flushing the data for the removed file to disk.
1591 TMPFS_NODE_LOCK(node);
1592 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 &&
1593 node->tn_links == 0)
1595 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1596 TMPFS_NODE_UNLOCK(node);
1597 if (node->tn_type == VREG)
1598 tmpfs_truncate(vp, 0);
1601 TMPFS_NODE_UNLOCK(node);
1603 lwkt_reltoken(&mp->mnt_token);
1608 /* --------------------------------------------------------------------- */
1611 tmpfs_reclaim(struct vop_reclaim_args *v)
1613 struct vnode *vp = v->a_vp;
1614 struct tmpfs_mount *tmp;
1615 struct tmpfs_node *node;
1619 lwkt_gettoken(&mp->mnt_token);
1621 node = VP_TO_TMPFS_NODE(vp);
1622 tmp = VFS_TO_TMPFS(vp->v_mount);
1623 KKASSERT(mp == tmp->tm_mount);
1628 * If the node referenced by this vnode was deleted by the
1629 * user, we must free its associated data structures now that
1630 * the vnode is being reclaimed.
1632 * Directories have an extra link ref.
1634 TMPFS_NODE_LOCK(node);
1635 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 &&
1636 node->tn_links == 0) {
1637 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1638 tmpfs_free_node(tmp, node);
1641 TMPFS_NODE_UNLOCK(node);
1643 lwkt_reltoken(&mp->mnt_token);
1645 KKASSERT(vp->v_data == NULL);
1649 /* --------------------------------------------------------------------- */
1652 tmpfs_mountctl(struct vop_mountctl_args *ap)
1654 struct tmpfs_mount *tmp;
1658 mp = ap->a_head.a_ops->head.vv_mount;
1659 lwkt_gettoken(&mp->mnt_token);
1662 case (MOUNTCTL_SET_EXPORT):
1663 tmp = (struct tmpfs_mount *) mp->mnt_data;
1665 if (ap->a_ctllen != sizeof(struct export_args))
1668 rc = vfs_export(mp, &tmp->tm_export,
1669 (const struct export_args *) ap->a_ctl);
1672 rc = vop_stdmountctl(ap);
1676 lwkt_reltoken(&mp->mnt_token);
1680 /* --------------------------------------------------------------------- */
1683 tmpfs_print(struct vop_print_args *v)
1685 struct vnode *vp = v->a_vp;
1687 struct tmpfs_node *node;
1689 node = VP_TO_TMPFS_NODE(vp);
1691 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1692 node, node->tn_flags, node->tn_links);
1693 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n",
1694 node->tn_mode, node->tn_uid, node->tn_gid,
1695 (uintmax_t)node->tn_size, node->tn_status);
1697 if (vp->v_type == VFIFO)
1705 /* --------------------------------------------------------------------- */
1708 tmpfs_pathconf(struct vop_pathconf_args *v)
1710 int name = v->a_name;
1711 register_t *retval = v->a_retval;
1734 case _PC_CHOWN_RESTRICTED:
1746 case _PC_FILESIZEBITS:
1747 *retval = 0; /* XXX Don't know which value should I return. */
1757 /************************************************************************
1759 ************************************************************************/
1761 static void filt_tmpfsdetach(struct knote *kn);
1762 static int filt_tmpfsread(struct knote *kn, long hint);
1763 static int filt_tmpfswrite(struct knote *kn, long hint);
1764 static int filt_tmpfsvnode(struct knote *kn, long hint);
1766 static struct filterops tmpfsread_filtops =
1767 { FILTEROP_ISFD | FILTEROP_MPSAFE,
1768 NULL, filt_tmpfsdetach, filt_tmpfsread };
1769 static struct filterops tmpfswrite_filtops =
1770 { FILTEROP_ISFD | FILTEROP_MPSAFE,
1771 NULL, filt_tmpfsdetach, filt_tmpfswrite };
1772 static struct filterops tmpfsvnode_filtops =
1773 { FILTEROP_ISFD | FILTEROP_MPSAFE,
1774 NULL, filt_tmpfsdetach, filt_tmpfsvnode };
1777 tmpfs_kqfilter (struct vop_kqfilter_args *ap)
1779 struct vnode *vp = ap->a_vp;
1780 struct knote *kn = ap->a_kn;
1782 switch (kn->kn_filter) {
1784 kn->kn_fop = &tmpfsread_filtops;
1787 kn->kn_fop = &tmpfswrite_filtops;
1790 kn->kn_fop = &tmpfsvnode_filtops;
1793 return (EOPNOTSUPP);
1796 kn->kn_hook = (caddr_t)vp;
1798 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1804 filt_tmpfsdetach(struct knote *kn)
1806 struct vnode *vp = (void *)kn->kn_hook;
1808 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1812 filt_tmpfsread(struct knote *kn, long hint)
1814 struct vnode *vp = (void *)kn->kn_hook;
1815 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp);
1818 if (hint == NOTE_REVOKE) {
1819 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
1824 * Interlock against MP races when performing this function.
1826 TMPFS_NODE_LOCK_SH(node);
1827 off = node->tn_size - kn->kn_fp->f_offset;
1828 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
1829 if (kn->kn_sfflags & NOTE_OLDAPI) {
1830 TMPFS_NODE_UNLOCK(node);
1833 if (kn->kn_data == 0) {
1834 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
1836 TMPFS_NODE_UNLOCK(node);
1837 return (kn->kn_data != 0);
1841 filt_tmpfswrite(struct knote *kn, long hint)
1843 if (hint == NOTE_REVOKE)
1844 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
1850 filt_tmpfsvnode(struct knote *kn, long hint)
1852 if (kn->kn_sfflags & hint)
1853 kn->kn_fflags |= hint;
1854 if (hint == NOTE_REVOKE) {
1855 kn->kn_flags |= (EV_EOF | EV_NODATA);
1858 return (kn->kn_fflags != 0);
1862 /* --------------------------------------------------------------------- */
1865 * vnode operations vector used for files stored in a tmpfs file system.
1867 struct vop_ops tmpfs_vnode_vops = {
1868 .vop_default = vop_defaultop,
1869 .vop_getpages = vop_stdgetpages,
1870 .vop_putpages = vop_stdputpages,
1871 .vop_ncreate = tmpfs_ncreate,
1872 .vop_nresolve = tmpfs_nresolve,
1873 .vop_nlookupdotdot = tmpfs_nlookupdotdot,
1874 .vop_nmknod = tmpfs_nmknod,
1875 .vop_open = tmpfs_open,
1876 .vop_close = tmpfs_close,
1877 .vop_access = tmpfs_access,
1878 .vop_getattr = tmpfs_getattr,
1879 .vop_setattr = tmpfs_setattr,
1880 .vop_read = tmpfs_read,
1881 .vop_write = tmpfs_write,
1882 .vop_fsync = tmpfs_fsync,
1883 .vop_mountctl = tmpfs_mountctl,
1884 .vop_nremove = tmpfs_nremove,
1885 .vop_nlink = tmpfs_nlink,
1886 .vop_nrename = tmpfs_nrename,
1887 .vop_nmkdir = tmpfs_nmkdir,
1888 .vop_nrmdir = tmpfs_nrmdir,
1889 .vop_nsymlink = tmpfs_nsymlink,
1890 .vop_readdir = tmpfs_readdir,
1891 .vop_readlink = tmpfs_readlink,
1892 .vop_inactive = tmpfs_inactive,
1893 .vop_reclaim = tmpfs_reclaim,
1894 .vop_print = tmpfs_print,
1895 .vop_pathconf = tmpfs_pathconf,
1896 .vop_bmap = tmpfs_bmap,
1897 .vop_strategy = tmpfs_strategy,
1898 .vop_advlock = tmpfs_advlock,
1899 .vop_kqfilter = tmpfs_kqfilter