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_object.h>
55 #include <vm/vm_page.h>
56 #include <vm/vm_pager.h>
57 #include <vm/swap_pager.h>
61 #include <vfs/fifofs/fifo.h>
62 #include <vfs/tmpfs/tmpfs_vnops.h>
63 #include <vfs/tmpfs/tmpfs.h>
65 MALLOC_DECLARE(M_TMPFS);
67 static void tmpfs_strategy_done(struct bio *bio);
71 tmpfs_knote(struct vnode *vp, int flags)
74 KNOTE(&vp->v_pollinfo.vpi_kqinfo.ki_note, flags);
78 /* --------------------------------------------------------------------- */
81 tmpfs_nresolve(struct vop_nresolve_args *v)
83 struct vnode *dvp = v->a_dvp;
84 struct vnode *vp = NULL;
85 struct namecache *ncp = v->a_nch->ncp;
86 struct tmpfs_node *tnode;
89 struct tmpfs_dirent *de;
90 struct tmpfs_node *dnode;
92 dnode = VP_TO_TMPFS_DIR(dvp);
94 de = tmpfs_dir_lookup(dnode, NULL, ncp);
99 * Allocate a vnode for the node we found.
102 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
103 LK_EXCLUSIVE | LK_RETRY, &vp);
111 * Store the result of this lookup in the cache. Avoid this if the
112 * request was for creation, as it does not improve timings on
117 cache_setvp(v->a_nch, vp);
119 } else if (error == ENOENT) {
120 cache_setvp(v->a_nch, NULL);
126 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v)
128 struct vnode *dvp = v->a_dvp;
129 struct vnode **vpp = v->a_vpp;
130 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp);
131 struct ucred *cred = v->a_cred;
135 /* Check accessibility of requested node as a first step. */
136 error = VOP_ACCESS(dvp, VEXEC, cred);
140 if (dnode->tn_dir.tn_parent != NULL) {
141 /* Allocate a new vnode on the matching entry. */
142 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
143 LK_EXCLUSIVE | LK_RETRY, vpp);
149 return (*vpp == NULL) ? ENOENT : 0;
152 /* --------------------------------------------------------------------- */
155 tmpfs_ncreate(struct vop_ncreate_args *v)
157 struct vnode *dvp = v->a_dvp;
158 struct vnode **vpp = v->a_vpp;
159 struct namecache *ncp = v->a_nch->ncp;
160 struct vattr *vap = v->a_vap;
161 struct ucred *cred = v->a_cred;
164 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK);
166 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
168 cache_setunresolved(v->a_nch);
169 cache_setvp(v->a_nch, *vpp);
170 tmpfs_knote(dvp, NOTE_WRITE);
175 /* --------------------------------------------------------------------- */
178 tmpfs_nmknod(struct vop_nmknod_args *v)
180 struct vnode *dvp = v->a_dvp;
181 struct vnode **vpp = v->a_vpp;
182 struct namecache *ncp = v->a_nch->ncp;
183 struct vattr *vap = v->a_vap;
184 struct ucred *cred = v->a_cred;
187 if (vap->va_type != VBLK && vap->va_type != VCHR &&
188 vap->va_type != VFIFO)
191 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
193 cache_setunresolved(v->a_nch);
194 cache_setvp(v->a_nch, *vpp);
195 tmpfs_knote(dvp, NOTE_WRITE);
201 /* --------------------------------------------------------------------- */
204 tmpfs_open(struct vop_open_args *v)
206 struct vnode *vp = v->a_vp;
207 int mode = v->a_mode;
210 struct tmpfs_node *node;
212 node = VP_TO_TMPFS_NODE(vp);
214 /* The file is still active but all its names have been removed
215 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
216 * it is about to die. */
217 if (node->tn_links < 1)
220 /* If the file is marked append-only, deny write requests. */
221 if ((node->tn_flags & APPEND) &&
222 (mode & (FWRITE | O_APPEND)) == FWRITE) {
225 return (vop_stdopen(v));
230 /* --------------------------------------------------------------------- */
233 tmpfs_close(struct vop_close_args *v)
235 struct vnode *vp = v->a_vp;
236 struct tmpfs_node *node;
238 node = VP_TO_TMPFS_NODE(vp);
240 if (node->tn_links > 0) {
241 /* Update node times. No need to do it if the node has
242 * been deleted, because it will vanish after we return. */
246 return vop_stdclose(v);
249 /* --------------------------------------------------------------------- */
252 tmpfs_access(struct vop_access_args *v)
254 struct vnode *vp = v->a_vp;
256 struct tmpfs_node *node;
258 node = VP_TO_TMPFS_NODE(vp);
260 switch (vp->v_type) {
266 if ((v->a_mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
286 if ((v->a_mode & VWRITE) && (node->tn_flags & IMMUTABLE)) {
291 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0);
298 /* --------------------------------------------------------------------- */
301 tmpfs_getattr(struct vop_getattr_args *v)
303 struct vnode *vp = v->a_vp;
304 struct vattr *vap = v->a_vap;
305 struct tmpfs_node *node;
307 node = VP_TO_TMPFS_NODE(vp);
309 lwkt_gettoken(&vp->v_mount->mnt_token);
312 vap->va_type = vp->v_type;
313 vap->va_mode = node->tn_mode;
314 vap->va_nlink = node->tn_links;
315 vap->va_uid = node->tn_uid;
316 vap->va_gid = node->tn_gid;
317 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
318 vap->va_fileid = node->tn_id;
319 vap->va_size = node->tn_size;
320 vap->va_blocksize = PAGE_SIZE;
321 vap->va_atime.tv_sec = node->tn_atime;
322 vap->va_atime.tv_nsec = node->tn_atimensec;
323 vap->va_mtime.tv_sec = node->tn_mtime;
324 vap->va_mtime.tv_nsec = node->tn_mtimensec;
325 vap->va_ctime.tv_sec = node->tn_ctime;
326 vap->va_ctime.tv_nsec = node->tn_ctimensec;
327 vap->va_gen = node->tn_gen;
328 vap->va_flags = node->tn_flags;
329 if (vp->v_type == VBLK || vp->v_type == VCHR)
331 vap->va_rmajor = umajor(node->tn_rdev);
332 vap->va_rminor = uminor(node->tn_rdev);
334 vap->va_bytes = round_page(node->tn_size);
337 lwkt_reltoken(&vp->v_mount->mnt_token);
342 /* --------------------------------------------------------------------- */
345 tmpfs_setattr(struct vop_setattr_args *v)
347 struct vnode *vp = v->a_vp;
348 struct vattr *vap = v->a_vap;
349 struct ucred *cred = v->a_cred;
350 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp);
354 if (error == 0 && (vap->va_flags != VNOVAL)) {
355 error = tmpfs_chflags(vp, vap->va_flags, cred);
356 kflags |= NOTE_ATTRIB;
359 if (error == 0 && (vap->va_size != VNOVAL)) {
360 if (vap->va_size > node->tn_size)
361 kflags |= NOTE_WRITE | NOTE_EXTEND;
363 kflags |= NOTE_WRITE;
364 error = tmpfs_chsize(vp, vap->va_size, cred);
367 if (error == 0 && (vap->va_uid != (uid_t)VNOVAL ||
368 vap->va_gid != (gid_t)VNOVAL)) {
369 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred);
370 kflags |= NOTE_ATTRIB;
373 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL)) {
374 error = tmpfs_chmod(vp, vap->va_mode, cred);
375 kflags |= NOTE_ATTRIB;
378 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
379 vap->va_atime.tv_nsec != VNOVAL) ||
380 (vap->va_mtime.tv_sec != VNOVAL &&
381 vap->va_mtime.tv_nsec != VNOVAL) )) {
382 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
383 vap->va_vaflags, cred);
384 kflags |= NOTE_ATTRIB;
387 /* Update the node times. We give preference to the error codes
388 * generated by this function rather than the ones that may arise
389 * from tmpfs_update. */
391 tmpfs_knote(vp, kflags);
396 /* --------------------------------------------------------------------- */
399 * fsync is usually a NOP, but we must take action when unmounting or
403 tmpfs_fsync(struct vop_fsync_args *v)
405 struct tmpfs_mount *tmp;
406 struct tmpfs_node *node;
407 struct vnode *vp = v->a_vp;
409 tmp = VFS_TO_TMPFS(vp->v_mount);
410 node = VP_TO_TMPFS_NODE(vp);
413 if (vp->v_type == VREG) {
414 if (vp->v_flag & VRECLAIMED) {
415 if (node->tn_links == 0)
416 tmpfs_truncate(vp, 0);
418 vfsync(v->a_vp, v->a_waitfor, 1, NULL, NULL);
424 /* --------------------------------------------------------------------- */
427 tmpfs_read (struct vop_read_args *ap)
430 struct vnode *vp = ap->a_vp;
431 struct uio *uio = ap->a_uio;
432 struct tmpfs_node *node;
439 if (uio->uio_resid == 0) {
443 node = VP_TO_TMPFS_NODE(vp);
445 if (uio->uio_offset < 0)
447 if (vp->v_type != VREG)
450 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) {
452 * Use buffer cache I/O (via tmpfs_strategy)
454 offset = (size_t)uio->uio_offset & BMASK;
455 base_offset = (off_t)uio->uio_offset - offset;
456 bp = getcacheblk(vp, base_offset, BSIZE, 0);
458 lwkt_gettoken(&vp->v_mount->mnt_token);
459 error = bread(vp, base_offset, BSIZE, &bp);
462 lwkt_reltoken(&vp->v_mount->mnt_token);
463 kprintf("tmpfs_read bread error %d\n", error);
466 lwkt_reltoken(&vp->v_mount->mnt_token);
470 * Figure out how many bytes we can actually copy this loop.
472 len = BSIZE - offset;
473 if (len > uio->uio_resid)
474 len = uio->uio_resid;
475 if (len > node->tn_size - uio->uio_offset)
476 len = (size_t)(node->tn_size - uio->uio_offset);
478 error = uiomove((char *)bp->b_data + offset, len, uio);
481 kprintf("tmpfs_read uiomove error %d\n", error);
486 TMPFS_NODE_LOCK(node);
487 node->tn_status |= TMPFS_NODE_ACCESSED;
488 TMPFS_NODE_UNLOCK(node);
494 tmpfs_write (struct vop_write_args *ap)
497 struct vnode *vp = ap->a_vp;
498 struct uio *uio = ap->a_uio;
499 struct thread *td = uio->uio_td;
500 struct tmpfs_node *node;
512 if (uio->uio_resid == 0) {
516 node = VP_TO_TMPFS_NODE(vp);
518 if (vp->v_type != VREG)
521 lwkt_gettoken(&vp->v_mount->mnt_token);
523 oldsize = node->tn_size;
524 if (ap->a_ioflag & IO_APPEND)
525 uio->uio_offset = node->tn_size;
528 * Check for illegal write offsets.
530 if (uio->uio_offset + uio->uio_resid >
531 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize) {
532 lwkt_reltoken(&vp->v_mount->mnt_token);
536 if (vp->v_type == VREG && td != NULL) {
537 error = kern_getrlimit(RLIMIT_FSIZE, &limit);
539 lwkt_reltoken(&vp->v_mount->mnt_token);
542 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) {
543 ksignal(td->td_proc, SIGXFSZ);
544 lwkt_reltoken(&vp->v_mount->mnt_token);
551 * Extend the file's size if necessary
553 extended = ((uio->uio_offset + uio->uio_resid) > node->tn_size);
555 while (uio->uio_resid > 0) {
557 * Use buffer cache I/O (via tmpfs_strategy)
559 offset = (size_t)uio->uio_offset & BMASK;
560 base_offset = (off_t)uio->uio_offset - offset;
561 len = BSIZE - offset;
562 if (len > uio->uio_resid)
563 len = uio->uio_resid;
565 if ((uio->uio_offset + len) > node->tn_size) {
566 trivial = (uio->uio_offset <= node->tn_size);
567 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial);
573 * Read to fill in any gaps. Theoretically we could
574 * optimize this if the write covers the entire buffer
575 * and is not a UIO_NOCOPY write, however this can lead
576 * to a security violation exposing random kernel memory
577 * (whatever junk was in the backing VM pages before).
579 * So just use bread() to do the right thing.
581 error = bread(vp, base_offset, BSIZE, &bp);
582 error = uiomove((char *)bp->b_data + offset, len, uio);
584 kprintf("tmpfs_write uiomove error %d\n", error);
589 if (uio->uio_offset > node->tn_size) {
590 node->tn_size = uio->uio_offset;
591 kflags |= NOTE_EXTEND;
593 kflags |= NOTE_WRITE;
596 * Always try to flush the page if the request is coming
597 * from the pageout daemon (IO_ASYNC), else buwrite() the
600 * buwrite() dirties the underlying VM pages instead of
601 * dirtying the buffer, releasing the buffer as a clean
602 * buffer. This allows tmpfs to use essentially all
603 * available memory to cache file data. If we used bdwrite()
604 * the buffer cache would wind up flushing the data to
607 bp->b_flags |= B_AGE;
608 if (ap->a_ioflag & IO_ASYNC) {
615 kprintf("tmpfs_write bwrite error %d\n", bp->b_error);
622 (void)tmpfs_reg_resize(vp, oldsize, trivial);
623 kflags &= ~NOTE_EXTEND;
629 * Currently we don't set the mtime on files modified via mmap()
630 * because we can't tell the difference between those modifications
631 * and an attempt by the pageout daemon to flush tmpfs pages to
634 * This is because in order to defer flushes as long as possible
635 * buwrite() works by marking the underlying VM pages dirty in
636 * order to be able to dispose of the buffer cache buffer without
639 TMPFS_NODE_LOCK(node);
640 if (uio->uio_segflg != UIO_NOCOPY)
641 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED;
643 node->tn_status |= TMPFS_NODE_CHANGED;
645 if (node->tn_mode & (S_ISUID | S_ISGID)) {
646 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
647 node->tn_mode &= ~(S_ISUID | S_ISGID);
649 TMPFS_NODE_UNLOCK(node);
652 tmpfs_knote(vp, kflags);
655 lwkt_reltoken(&vp->v_mount->mnt_token);
660 tmpfs_advlock (struct vop_advlock_args *ap)
662 struct tmpfs_node *node;
663 struct vnode *vp = ap->a_vp;
665 node = VP_TO_TMPFS_NODE(vp);
667 return (lf_advlock(ap, &node->tn_advlock, node->tn_size));
671 * The strategy function is typically only called when memory pressure
672 * forces the system to attempt to pageout pages. It can also be called
673 * by [n]vtruncbuf() when a truncation cuts a page in half. Normal write
677 tmpfs_strategy(struct vop_strategy_args *ap)
679 struct bio *bio = ap->a_bio;
681 struct buf *bp = bio->bio_buf;
682 struct vnode *vp = ap->a_vp;
683 struct tmpfs_node *node;
688 if (vp->v_type != VREG) {
689 bp->b_resid = bp->b_bcount;
690 bp->b_flags |= B_ERROR | B_INVAL;
691 bp->b_error = EINVAL;
696 lwkt_gettoken(&vp->v_mount->mnt_token);
697 node = VP_TO_TMPFS_NODE(vp);
699 uobj = node->tn_reg.tn_aobj;
702 * Don't bother flushing to swap if there is no swap, just
703 * ensure that the pages are marked as needing a commit (still).
705 if (bp->b_cmd == BUF_CMD_WRITE && vm_swap_size == 0) {
706 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
707 m = bp->b_xio.xio_pages[i];
708 vm_page_need_commit(m);
714 nbio = push_bio(bio);
715 nbio->bio_done = tmpfs_strategy_done;
716 nbio->bio_offset = bio->bio_offset;
717 swap_pager_strategy(uobj, nbio);
720 lwkt_reltoken(&vp->v_mount->mnt_token);
725 * If we were unable to commit the pages to swap make sure they are marked
726 * as needing a commit (again). If we were, clear the flag to allow the
730 tmpfs_strategy_done(struct bio *bio)
738 if (bp->b_flags & B_ERROR) {
739 bp->b_flags &= ~B_ERROR;
742 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
743 m = bp->b_xio.xio_pages[i];
744 vm_page_need_commit(m);
747 for (i = 0; i < bp->b_xio.xio_npages; ++i) {
748 m = bp->b_xio.xio_pages[i];
749 vm_page_clear_commit(m);
757 tmpfs_bmap(struct vop_bmap_args *ap)
759 if (ap->a_doffsetp != NULL)
760 *ap->a_doffsetp = ap->a_loffset;
761 if (ap->a_runp != NULL)
763 if (ap->a_runb != NULL)
769 /* --------------------------------------------------------------------- */
772 tmpfs_nremove(struct vop_nremove_args *v)
774 struct vnode *dvp = v->a_dvp;
775 struct namecache *ncp = v->a_nch->ncp;
778 struct tmpfs_dirent *de;
779 struct tmpfs_mount *tmp;
780 struct tmpfs_node *dnode;
781 struct tmpfs_node *node;
784 * We have to acquire the vp from v->a_nch because we will likely
785 * unresolve the namecache entry, and a vrele/vput is needed to
786 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
788 * We have to use vget to clear any inactive state on the vnode,
789 * otherwise the vnode may remain inactive and thus tmpfs_inactive
790 * will not get called when we release it.
792 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
793 KKASSERT(error == 0);
796 if (vp->v_type == VDIR) {
801 dnode = VP_TO_TMPFS_DIR(dvp);
802 node = VP_TO_TMPFS_NODE(vp);
803 tmp = VFS_TO_TMPFS(vp->v_mount);
804 de = tmpfs_dir_lookup(dnode, node, ncp);
810 /* Files marked as immutable or append-only cannot be deleted. */
811 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
812 (dnode->tn_flags & APPEND)) {
817 /* Remove the entry from the directory; as it is a file, we do not
818 * have to change the number of hard links of the directory. */
819 tmpfs_dir_detach(dnode, de);
821 /* Free the directory entry we just deleted. Note that the node
822 * referred by it will not be removed until the vnode is really
824 tmpfs_free_dirent(tmp, de);
826 if (node->tn_links > 0) {
827 TMPFS_NODE_LOCK(node);
828 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
830 TMPFS_NODE_UNLOCK(node);
833 cache_setunresolved(v->a_nch);
834 cache_setvp(v->a_nch, NULL);
835 tmpfs_knote(vp, NOTE_DELETE);
836 /*cache_inval_vp(vp, CINV_DESTROY);*/
837 tmpfs_knote(dvp, NOTE_WRITE);
846 /* --------------------------------------------------------------------- */
849 tmpfs_nlink(struct vop_nlink_args *v)
851 struct vnode *dvp = v->a_dvp;
852 struct vnode *vp = v->a_vp;
853 struct namecache *ncp = v->a_nch->ncp;
854 struct tmpfs_dirent *de;
855 struct tmpfs_node *node;
856 struct tmpfs_node *dnode;
859 KKASSERT(dvp != vp); /* XXX When can this be false? */
861 node = VP_TO_TMPFS_NODE(vp);
862 dnode = VP_TO_TMPFS_NODE(dvp);
864 /* XXX: Why aren't the following two tests done by the caller? */
866 /* Hard links of directories are forbidden. */
867 if (vp->v_type == VDIR) {
872 /* Cannot create cross-device links. */
873 if (dvp->v_mount != vp->v_mount) {
878 /* Ensure that we do not overflow the maximum number of links imposed
880 KKASSERT(node->tn_links <= LINK_MAX);
881 if (node->tn_links == LINK_MAX) {
886 /* We cannot create links of files marked immutable or append-only. */
887 if (node->tn_flags & (IMMUTABLE | APPEND)) {
892 /* Allocate a new directory entry to represent the node. */
893 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
894 ncp->nc_name, ncp->nc_nlen, &de);
898 /* Insert the new directory entry into the appropriate directory. */
899 tmpfs_dir_attach(dnode, de);
901 /* vp link count has changed, so update node times. */
903 TMPFS_NODE_LOCK(node);
904 node->tn_status |= TMPFS_NODE_CHANGED;
905 TMPFS_NODE_UNLOCK(node);
908 tmpfs_knote(vp, NOTE_LINK);
909 cache_setunresolved(v->a_nch);
910 cache_setvp(v->a_nch, vp);
911 tmpfs_knote(dvp, NOTE_WRITE);
918 /* --------------------------------------------------------------------- */
921 tmpfs_nrename(struct vop_nrename_args *v)
923 struct vnode *fdvp = v->a_fdvp;
924 struct namecache *fncp = v->a_fnch->ncp;
925 struct vnode *fvp = fncp->nc_vp;
926 struct vnode *tdvp = v->a_tdvp;
927 struct namecache *tncp = v->a_tnch->ncp;
929 struct tmpfs_dirent *de;
930 struct tmpfs_mount *tmp;
931 struct tmpfs_node *fdnode;
932 struct tmpfs_node *fnode;
933 struct tmpfs_node *tnode;
934 struct tmpfs_node *tdnode;
940 * Because tvp can get overwritten we have to vget it instead of
941 * just vref or use it, otherwise it's VINACTIVE flag may not get
942 * cleared and the node won't get destroyed.
944 error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp);
946 tnode = VP_TO_TMPFS_NODE(tvp);
952 /* Disallow cross-device renames.
953 * XXX Why isn't this done by the caller? */
954 if (fvp->v_mount != tdvp->v_mount ||
955 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
960 tmp = VFS_TO_TMPFS(tdvp->v_mount);
961 tdnode = VP_TO_TMPFS_DIR(tdvp);
963 /* If source and target are the same file, there is nothing to do. */
969 fdnode = VP_TO_TMPFS_DIR(fdvp);
970 fnode = VP_TO_TMPFS_NODE(fvp);
971 de = tmpfs_dir_lookup(fdnode, fnode, fncp);
973 /* Avoid manipulating '.' and '..' entries. */
978 KKASSERT(de->td_node == fnode);
981 * If replacing an entry in the target directory and that entry
982 * is a directory, it must be empty.
984 * Kern_rename gurantees the destination to be a directory
985 * if the source is one (it does?).
988 KKASSERT(tnode != NULL);
990 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
991 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
996 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
997 if (tnode->tn_size > 0) {
1001 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
1004 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
1008 KKASSERT(fnode->tn_type != VDIR &&
1009 tnode->tn_type != VDIR);
1013 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
1014 (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
1020 * Ensure that we have enough memory to hold the new name, if it
1021 * has to be changed.
1023 if (fncp->nc_nlen != tncp->nc_nlen ||
1024 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
1025 newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone,
1026 M_WAITOK | M_NULLOK);
1027 if (newname == NULL) {
1031 bcopy(tncp->nc_name, newname, tncp->nc_nlen);
1032 newname[tncp->nc_nlen] = '\0';
1038 * Unlink entry from source directory. Note that the kernel has
1039 * already checked for illegal recursion cases (renaming a directory
1040 * into a subdirectory of itself).
1042 if (fdnode != tdnode)
1043 tmpfs_dir_detach(fdnode, de);
1046 * Handle any name change. Swap with newname, we will
1047 * deallocate it at the end.
1049 if (newname != NULL) {
1051 TMPFS_NODE_LOCK(fnode);
1052 fnode->tn_status |= TMPFS_NODE_CHANGED;
1053 TMPFS_NODE_UNLOCK(fnode);
1055 oldname = de->td_name;
1056 de->td_name = newname;
1057 de->td_namelen = (uint16_t)tncp->nc_nlen;
1062 * Link entry to target directory. If the entry
1063 * represents a directory move the parent linkage
1066 if (fdnode != tdnode) {
1067 if (de->td_node->tn_type == VDIR) {
1068 TMPFS_VALIDATE_DIR(fnode);
1070 TMPFS_NODE_LOCK(tdnode);
1072 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1073 TMPFS_NODE_UNLOCK(tdnode);
1075 TMPFS_NODE_LOCK(fnode);
1076 fnode->tn_dir.tn_parent = tdnode;
1077 fnode->tn_status |= TMPFS_NODE_CHANGED;
1078 TMPFS_NODE_UNLOCK(fnode);
1080 TMPFS_NODE_LOCK(fdnode);
1082 fdnode->tn_status |= TMPFS_NODE_MODIFIED;
1083 TMPFS_NODE_UNLOCK(fdnode);
1085 tmpfs_dir_attach(tdnode, de);
1087 TMPFS_NODE_LOCK(tdnode);
1088 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1089 TMPFS_NODE_UNLOCK(tdnode);
1093 * If we are overwriting an entry, we have to remove the old one
1094 * from the target directory.
1097 /* Remove the old entry from the target directory. */
1098 de = tmpfs_dir_lookup(tdnode, tnode, tncp);
1099 tmpfs_dir_detach(tdnode, de);
1100 tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE);
1103 * Free the directory entry we just deleted. Note that the
1104 * node referred by it will not be removed until the vnode is
1107 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de);
1108 /*cache_inval_vp(tvp, CINV_DESTROY);*/
1115 kfree(newname, tmp->tm_name_zone);
1118 cache_rename(v->a_fnch, v->a_tnch);
1119 tmpfs_knote(v->a_fdvp, NOTE_WRITE);
1120 tmpfs_knote(v->a_tdvp, NOTE_WRITE);
1121 if (fnode->tn_vnode)
1122 tmpfs_knote(fnode->tn_vnode, NOTE_RENAME);
1135 /* --------------------------------------------------------------------- */
1138 tmpfs_nmkdir(struct vop_nmkdir_args *v)
1140 struct vnode *dvp = v->a_dvp;
1141 struct vnode **vpp = v->a_vpp;
1142 struct namecache *ncp = v->a_nch->ncp;
1143 struct vattr *vap = v->a_vap;
1144 struct ucred *cred = v->a_cred;
1147 KKASSERT(vap->va_type == VDIR);
1149 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
1151 cache_setunresolved(v->a_nch);
1152 cache_setvp(v->a_nch, *vpp);
1153 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
1159 /* --------------------------------------------------------------------- */
1162 tmpfs_nrmdir(struct vop_nrmdir_args *v)
1164 struct vnode *dvp = v->a_dvp;
1165 struct namecache *ncp = v->a_nch->ncp;
1167 struct tmpfs_dirent *de;
1168 struct tmpfs_mount *tmp;
1169 struct tmpfs_node *dnode;
1170 struct tmpfs_node *node;
1174 * We have to acquire the vp from v->a_nch because we will likely
1175 * unresolve the namecache entry, and a vrele/vput is needed to
1176 * trigger the tmpfs_inactive/tmpfs_reclaim sequence.
1178 * We have to use vget to clear any inactive state on the vnode,
1179 * otherwise the vnode may remain inactive and thus tmpfs_inactive
1180 * will not get called when we release it.
1182 error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
1183 KKASSERT(error == 0);
1187 * Prevalidate so we don't hit an assertion later
1189 if (vp->v_type != VDIR) {
1194 tmp = VFS_TO_TMPFS(dvp->v_mount);
1195 dnode = VP_TO_TMPFS_DIR(dvp);
1196 node = VP_TO_TMPFS_DIR(vp);
1198 /* Directories with more than two entries ('.' and '..') cannot be
1200 if (node->tn_size > 0) {
1205 if ((dnode->tn_flags & APPEND)
1206 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1211 /* This invariant holds only if we are not trying to remove "..".
1212 * We checked for that above so this is safe now. */
1213 KKASSERT(node->tn_dir.tn_parent == dnode);
1215 /* Get the directory entry associated with node (vp). This was
1216 * filled by tmpfs_lookup while looking up the entry. */
1217 de = tmpfs_dir_lookup(dnode, node, ncp);
1218 KKASSERT(TMPFS_DIRENT_MATCHES(de,
1222 /* Check flags to see if we are allowed to remove the directory. */
1223 if ((dnode->tn_flags & APPEND) ||
1224 node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1230 /* Detach the directory entry from the directory (dnode). */
1231 tmpfs_dir_detach(dnode, de);
1233 /* No vnode should be allocated for this entry from this point */
1234 TMPFS_NODE_LOCK(node);
1235 TMPFS_ASSERT_ELOCKED(node);
1236 TMPFS_NODE_LOCK(dnode);
1237 TMPFS_ASSERT_ELOCKED(dnode);
1240 /* handled by tmpfs_free_node */
1241 KKASSERT(node->tn_links > 0);
1243 node->tn_dir.tn_parent = NULL;
1245 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1246 TMPFS_NODE_MODIFIED;
1249 /* handled by tmpfs_free_node */
1250 KKASSERT(dnode->tn_links > 0);
1253 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1254 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1256 TMPFS_NODE_UNLOCK(dnode);
1257 TMPFS_NODE_UNLOCK(node);
1259 /* Free the directory entry we just deleted. Note that the node
1260 * referred by it will not be removed until the vnode is really
1262 tmpfs_free_dirent(tmp, de);
1264 /* Release the deleted vnode (will destroy the node, notify
1265 * interested parties and clean it from the cache). */
1267 TMPFS_NODE_LOCK(dnode);
1268 dnode->tn_status |= TMPFS_NODE_CHANGED;
1269 TMPFS_NODE_UNLOCK(dnode);
1272 cache_setunresolved(v->a_nch);
1273 cache_setvp(v->a_nch, NULL);
1274 /*cache_inval_vp(vp, CINV_DESTROY);*/
1275 tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
1284 /* --------------------------------------------------------------------- */
1287 tmpfs_nsymlink(struct vop_nsymlink_args *v)
1289 struct vnode *dvp = v->a_dvp;
1290 struct vnode **vpp = v->a_vpp;
1291 struct namecache *ncp = v->a_nch->ncp;
1292 struct vattr *vap = v->a_vap;
1293 struct ucred *cred = v->a_cred;
1294 char *target = v->a_target;
1297 vap->va_type = VLNK;
1298 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
1300 tmpfs_knote(*vpp, NOTE_WRITE);
1301 cache_setunresolved(v->a_nch);
1302 cache_setvp(v->a_nch, *vpp);
1308 /* --------------------------------------------------------------------- */
1311 tmpfs_readdir(struct vop_readdir_args *v)
1313 struct vnode *vp = v->a_vp;
1314 struct uio *uio = v->a_uio;
1315 int *eofflag = v->a_eofflag;
1316 off_t **cookies = v->a_cookies;
1317 int *ncookies = v->a_ncookies;
1318 struct tmpfs_mount *tmp;
1322 struct tmpfs_node *node;
1324 /* This operation only makes sense on directory nodes. */
1325 if (vp->v_type != VDIR)
1328 tmp = VFS_TO_TMPFS(vp->v_mount);
1329 node = VP_TO_TMPFS_DIR(vp);
1330 startoff = uio->uio_offset;
1332 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1333 error = tmpfs_dir_getdotdent(node, uio);
1339 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1340 error = tmpfs_dir_getdotdotdent(tmp, node, uio);
1346 error = tmpfs_dir_getdents(node, uio, &cnt);
1349 KKASSERT(error >= -1);
1354 if (eofflag != NULL)
1356 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1358 /* Update NFS-related variables. */
1359 if (error == 0 && cookies != NULL && ncookies != NULL) {
1361 off_t off = startoff;
1362 struct tmpfs_dirent *de = NULL;
1365 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1367 for (i = 0; i < cnt; i++) {
1368 KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
1369 if (off == TMPFS_DIRCOOKIE_DOT) {
1370 off = TMPFS_DIRCOOKIE_DOTDOT;
1372 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1373 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1374 } else if (de != NULL) {
1375 de = TAILQ_NEXT(de, td_entries);
1377 de = tmpfs_dir_lookupbycookie(node,
1379 KKASSERT(de != NULL);
1380 de = TAILQ_NEXT(de, td_entries);
1383 off = TMPFS_DIRCOOKIE_EOF;
1385 off = tmpfs_dircookie(de);
1388 (*cookies)[i] = off;
1390 KKASSERT(uio->uio_offset == off);
1396 /* --------------------------------------------------------------------- */
1399 tmpfs_readlink(struct vop_readlink_args *v)
1401 struct vnode *vp = v->a_vp;
1402 struct uio *uio = v->a_uio;
1405 struct tmpfs_node *node;
1407 KKASSERT(uio->uio_offset == 0);
1408 KKASSERT(vp->v_type == VLNK);
1410 node = VP_TO_TMPFS_NODE(vp);
1412 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1414 TMPFS_NODE_LOCK(node);
1415 node->tn_status |= TMPFS_NODE_ACCESSED;
1416 TMPFS_NODE_UNLOCK(node);
1421 /* --------------------------------------------------------------------- */
1424 tmpfs_inactive(struct vop_inactive_args *v)
1426 struct vnode *vp = v->a_vp;
1427 struct tmpfs_node *node;
1429 node = VP_TO_TMPFS_NODE(vp);
1440 * Get rid of unreferenced deleted vnodes sooner rather than
1441 * later so the data memory can be recovered immediately.
1443 * We must truncate the vnode to prevent the normal reclamation
1444 * path from flushing the data for the removed file to disk.
1446 TMPFS_NODE_LOCK(node);
1447 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 &&
1448 (node->tn_links == 0 ||
1449 (node->tn_links == 1 && node->tn_type == VDIR &&
1450 node->tn_dir.tn_parent)))
1452 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1453 TMPFS_NODE_UNLOCK(node);
1454 if (node->tn_type == VREG)
1455 tmpfs_truncate(vp, 0);
1458 TMPFS_NODE_UNLOCK(node);
1464 /* --------------------------------------------------------------------- */
1467 tmpfs_reclaim(struct vop_reclaim_args *v)
1469 struct vnode *vp = v->a_vp;
1470 struct tmpfs_mount *tmp;
1471 struct tmpfs_node *node;
1473 node = VP_TO_TMPFS_NODE(vp);
1474 tmp = VFS_TO_TMPFS(vp->v_mount);
1479 * If the node referenced by this vnode was deleted by the
1480 * user, we must free its associated data structures now that
1481 * the vnode is being reclaimed.
1483 * Directories have an extra link ref.
1485 TMPFS_NODE_LOCK(node);
1486 if ((node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0 &&
1487 (node->tn_links == 0 ||
1488 (node->tn_links == 1 && node->tn_type == VDIR &&
1489 node->tn_dir.tn_parent)))
1491 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1492 tmpfs_free_node(tmp, node);
1495 TMPFS_NODE_UNLOCK(node);
1498 KKASSERT(vp->v_data == NULL);
1502 /* --------------------------------------------------------------------- */
1505 tmpfs_mountctl(struct vop_mountctl_args *ap)
1507 struct tmpfs_mount *tmp;
1512 case (MOUNTCTL_SET_EXPORT):
1513 mp = ap->a_head.a_ops->head.vv_mount;
1514 tmp = (struct tmpfs_mount *) mp->mnt_data;
1516 if (ap->a_ctllen != sizeof(struct export_args))
1519 rc = vfs_export(mp, &tmp->tm_export,
1520 (const struct export_args *) ap->a_ctl);
1523 rc = vop_stdmountctl(ap);
1529 /* --------------------------------------------------------------------- */
1532 tmpfs_print(struct vop_print_args *v)
1534 struct vnode *vp = v->a_vp;
1536 struct tmpfs_node *node;
1538 node = VP_TO_TMPFS_NODE(vp);
1540 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1541 node, node->tn_flags, node->tn_links);
1542 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n",
1543 node->tn_mode, node->tn_uid, node->tn_gid,
1544 (uintmax_t)node->tn_size, node->tn_status);
1546 if (vp->v_type == VFIFO)
1554 /* --------------------------------------------------------------------- */
1557 tmpfs_pathconf(struct vop_pathconf_args *v)
1559 int name = v->a_name;
1560 register_t *retval = v->a_retval;
1583 case _PC_CHOWN_RESTRICTED:
1595 case _PC_FILESIZEBITS:
1596 *retval = 0; /* XXX Don't know which value should I return. */
1606 /************************************************************************
1608 ************************************************************************/
1610 static void filt_tmpfsdetach(struct knote *kn);
1611 static int filt_tmpfsread(struct knote *kn, long hint);
1612 static int filt_tmpfswrite(struct knote *kn, long hint);
1613 static int filt_tmpfsvnode(struct knote *kn, long hint);
1615 static struct filterops tmpfsread_filtops =
1616 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsread };
1617 static struct filterops tmpfswrite_filtops =
1618 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfswrite };
1619 static struct filterops tmpfsvnode_filtops =
1620 { FILTEROP_ISFD, NULL, filt_tmpfsdetach, filt_tmpfsvnode };
1623 tmpfs_kqfilter (struct vop_kqfilter_args *ap)
1625 struct vnode *vp = ap->a_vp;
1626 struct knote *kn = ap->a_kn;
1628 switch (kn->kn_filter) {
1630 kn->kn_fop = &tmpfsread_filtops;
1633 kn->kn_fop = &tmpfswrite_filtops;
1636 kn->kn_fop = &tmpfsvnode_filtops;
1639 return (EOPNOTSUPP);
1642 kn->kn_hook = (caddr_t)vp;
1644 knote_insert(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1650 filt_tmpfsdetach(struct knote *kn)
1652 struct vnode *vp = (void *)kn->kn_hook;
1654 knote_remove(&vp->v_pollinfo.vpi_kqinfo.ki_note, kn);
1658 filt_tmpfsread(struct knote *kn, long hint)
1660 struct vnode *vp = (void *)kn->kn_hook;
1661 struct tmpfs_node *node = VP_TO_TMPFS_NODE(vp);
1664 if (hint == NOTE_REVOKE) {
1665 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
1670 * Interlock against MP races when performing this function.
1672 lwkt_gettoken(&vp->v_mount->mnt_token);
1673 off = node->tn_size - kn->kn_fp->f_offset;
1674 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
1675 if (kn->kn_sfflags & NOTE_OLDAPI) {
1676 lwkt_reltoken(&vp->v_mount->mnt_token);
1680 if (kn->kn_data == 0) {
1681 kn->kn_data = (off < INTPTR_MAX) ? off : INTPTR_MAX;
1683 lwkt_reltoken(&vp->v_mount->mnt_token);
1684 return (kn->kn_data != 0);
1688 filt_tmpfswrite(struct knote *kn, long hint)
1690 if (hint == NOTE_REVOKE)
1691 kn->kn_flags |= (EV_EOF | EV_NODATA | EV_ONESHOT);
1697 filt_tmpfsvnode(struct knote *kn, long hint)
1699 if (kn->kn_sfflags & hint)
1700 kn->kn_fflags |= hint;
1701 if (hint == NOTE_REVOKE) {
1702 kn->kn_flags |= (EV_EOF | EV_NODATA);
1705 return (kn->kn_fflags != 0);
1709 /* --------------------------------------------------------------------- */
1712 * vnode operations vector used for files stored in a tmpfs file system.
1714 struct vop_ops tmpfs_vnode_vops = {
1715 .vop_default = vop_defaultop,
1716 .vop_getpages = vop_stdgetpages,
1717 .vop_putpages = vop_stdputpages,
1718 .vop_ncreate = tmpfs_ncreate,
1719 .vop_nresolve = tmpfs_nresolve,
1720 .vop_nlookupdotdot = tmpfs_nlookupdotdot,
1721 .vop_nmknod = tmpfs_nmknod,
1722 .vop_open = tmpfs_open,
1723 .vop_close = tmpfs_close,
1724 .vop_access = tmpfs_access,
1725 .vop_getattr = tmpfs_getattr,
1726 .vop_setattr = tmpfs_setattr,
1727 .vop_read = tmpfs_read,
1728 .vop_write = tmpfs_write,
1729 .vop_fsync = tmpfs_fsync,
1730 .vop_mountctl = tmpfs_mountctl,
1731 .vop_nremove = tmpfs_nremove,
1732 .vop_nlink = tmpfs_nlink,
1733 .vop_nrename = tmpfs_nrename,
1734 .vop_nmkdir = tmpfs_nmkdir,
1735 .vop_nrmdir = tmpfs_nrmdir,
1736 .vop_nsymlink = tmpfs_nsymlink,
1737 .vop_readdir = tmpfs_readdir,
1738 .vop_readlink = tmpfs_readlink,
1739 .vop_inactive = tmpfs_inactive,
1740 .vop_reclaim = tmpfs_reclaim,
1741 .vop_print = tmpfs_print,
1742 .vop_pathconf = tmpfs_pathconf,
1743 .vop_bmap = tmpfs_bmap,
1744 .vop_strategy = tmpfs_strategy,
1745 .vop_advlock = tmpfs_advlock,
1746 .vop_kqfilter = tmpfs_kqfilter