1 /* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
4 * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
34 * tmpfs vnode interface.
36 #include <sys/cdefs.h>
38 #include <sys/kernel.h>
39 #include <sys/kern_syscall.h>
40 #include <sys/param.h>
41 #include <sys/fcntl.h>
42 #include <sys/lockf.h>
45 #include <sys/resourcevar.h>
46 #include <sys/sched.h>
47 #include <sys/sfbuf.h>
49 #include <sys/systm.h>
50 #include <sys/unistd.h>
51 #include <sys/vfsops.h>
52 #include <sys/vnode.h>
54 #include <sys/mplock2.h>
57 #include <vm/vm_object.h>
58 #include <vm/vm_page.h>
59 #include <vm/vm_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 /* --------------------------------------------------------------------- */
70 tmpfs_nresolve(struct vop_nresolve_args *v)
72 struct vnode *dvp = v->a_dvp;
73 struct vnode *vp = NULL;
74 struct namecache *ncp = v->a_nch->ncp;
75 struct ucred *cred = v->a_cred;
78 struct tmpfs_dirent *de;
79 struct tmpfs_node *dnode;
81 dnode = VP_TO_TMPFS_DIR(dvp);
83 if (!vn_islocked(dvp));
84 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
86 /* Check accessibility of requested node as a first step. */
87 error = VOP_ACCESS(dvp, VEXEC, cred);
91 if (dnode->tn_dir.tn_parent == NULL) {
96 de = tmpfs_dir_lookup(dnode, NULL, ncp);
98 /* The entry was not found in the directory.
99 * This is OK if we are creating or renaming an
100 * entry and are working on the last component of
102 error = VOP_ACCESS(dvp, VWRITE, cred);
110 struct tmpfs_node *tnode;
112 /* The entry was found, so get its associated
116 /* If we are not at the last path component and
117 * found a non-directory or non-link entry (which
118 * may itself be pointing to a directory), raise
120 if (tnode->tn_links > 1 &&
121 tnode->tn_type != VDIR && tnode->tn_type != VLNK) {
126 error = VOP_ACCESS(dvp, VWRITE, cred);
130 /* Allocate a new vnode on the matching entry. */
131 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
132 LK_EXCLUSIVE | LK_RETRY, &vp);
136 if ((dnode->tn_mode & S_ISTXT) &&
137 VOP_ACCESS(vp, VWRITE, cred)) {
148 /* Store the result of this lookup in the cache. Avoid this if the
149 * request was for creation, as it does not improve timings on
153 cache_setvp(v->a_nch, vp);
156 if (error == ENOENT) {
157 cache_setvp(v->a_nch, NULL);
163 tmpfs_nlookupdotdot(struct vop_nlookupdotdot_args *v)
165 struct vnode *dvp = v->a_dvp;
166 struct vnode **vpp = v->a_vpp;
167 struct tmpfs_node *dnode = VP_TO_TMPFS_NODE(dvp);
168 struct ucred *cred = v->a_cred;
172 /* Check accessibility of requested node as a first step. */
173 error = VOP_ACCESS(dvp, VEXEC, cred);
177 if (dnode->tn_dir.tn_parent != NULL) {
178 /* Allocate a new vnode on the matching entry. */
179 error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
180 LK_EXCLUSIVE | LK_RETRY, vpp);
186 return (*vpp == NULL) ? ENOENT : 0;
189 /* --------------------------------------------------------------------- */
192 tmpfs_ncreate(struct vop_ncreate_args *v)
194 struct vnode *dvp = v->a_dvp;
195 struct vnode **vpp = v->a_vpp;
196 struct namecache *ncp = v->a_nch->ncp;
197 struct vattr *vap = v->a_vap;
198 struct ucred *cred = v->a_cred;
201 KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK);
203 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
204 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
206 cache_setunresolved(v->a_nch);
207 cache_setvp(v->a_nch, *vpp);
213 /* --------------------------------------------------------------------- */
216 tmpfs_nmknod(struct vop_nmknod_args *v)
218 struct vnode *dvp = v->a_dvp;
219 struct vnode **vpp = v->a_vpp;
220 struct namecache *ncp = v->a_nch->ncp;
221 struct vattr *vap = v->a_vap;
222 struct ucred *cred = v->a_cred;
225 if (vap->va_type != VBLK && vap->va_type != VCHR &&
226 vap->va_type != VFIFO)
229 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
230 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
232 cache_setunresolved(v->a_nch);
233 cache_setvp(v->a_nch, *vpp);
240 /* --------------------------------------------------------------------- */
243 tmpfs_open(struct vop_open_args *v)
245 struct vnode *vp = v->a_vp;
246 int mode = v->a_mode;
249 struct tmpfs_node *node;
251 KKASSERT(vn_islocked(vp));
253 node = VP_TO_TMPFS_NODE(vp);
255 /* The file is still active but all its names have been removed
256 * (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
257 * it is about to die. */
258 if (node->tn_links < 1)
261 /* If the file is marked append-only, deny write requests. */
262 if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
265 return (vop_stdopen(v));
268 KKASSERT(vn_islocked(vp));
272 /* --------------------------------------------------------------------- */
275 tmpfs_close(struct vop_close_args *v)
277 struct vnode *vp = v->a_vp;
278 struct tmpfs_node *node;
280 node = VP_TO_TMPFS_NODE(vp);
282 if (node->tn_links > 0) {
283 /* Update node times. No need to do it if the node has
284 * been deleted, because it will vanish after we return. */
288 return vop_stdclose(v);
291 /* --------------------------------------------------------------------- */
294 tmpfs_access(struct vop_access_args *v)
296 struct vnode *vp = v->a_vp;
298 struct tmpfs_node *node;
300 KKASSERT(vn_islocked(vp));
302 node = VP_TO_TMPFS_NODE(vp);
304 switch (vp->v_type) {
310 if (VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
330 if (VWRITE && node->tn_flags & IMMUTABLE) {
335 error = vop_helper_access(v, node->tn_uid, node->tn_gid, node->tn_mode, 0);
342 /* --------------------------------------------------------------------- */
345 tmpfs_getattr(struct vop_getattr_args *v)
347 struct vnode *vp = v->a_vp;
348 struct vattr *vap = v->a_vap;
350 struct tmpfs_node *node;
353 if(!vn_islocked(vp)) {
355 vn_lock(vp, LK_SHARED | LK_RETRY);
358 node = VP_TO_TMPFS_NODE(vp);
362 vap->va_type = vp->v_type;
363 vap->va_mode = node->tn_mode;
364 vap->va_nlink = node->tn_links;
365 vap->va_uid = node->tn_uid;
366 vap->va_gid = node->tn_gid;
367 vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
368 vap->va_fileid = node->tn_id;
369 vap->va_size = node->tn_size;
370 vap->va_blocksize = PAGE_SIZE;
371 vap->va_atime.tv_sec = node->tn_atime;
372 vap->va_atime.tv_nsec = node->tn_atimensec;
373 vap->va_mtime.tv_sec = node->tn_mtime;
374 vap->va_mtime.tv_nsec = node->tn_mtimensec;
375 vap->va_ctime.tv_sec = node->tn_ctime;
376 vap->va_ctime.tv_nsec = node->tn_ctimensec;
377 vap->va_gen = node->tn_gen;
378 vap->va_flags = node->tn_flags;
379 if (vp->v_type == VBLK || vp->v_type == VCHR)
381 vap->va_rmajor = umajor(node->tn_rdev);
382 vap->va_rminor = uminor(node->tn_rdev);
384 vap->va_bytes = round_page(node->tn_size);
393 /* --------------------------------------------------------------------- */
396 tmpfs_setattr(struct vop_setattr_args *v)
398 struct vnode *vp = v->a_vp;
399 struct vattr *vap = v->a_vap;
400 struct ucred *cred = v->a_cred;
405 if(!vn_islocked(vp)) {
407 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
410 /* Abort if any unsettable attribute is given. */
411 if (vap->va_type != VNON ||
412 vap->va_nlink != VNOVAL ||
413 vap->va_fsid != VNOVAL ||
414 vap->va_fileid != VNOVAL ||
415 vap->va_blocksize != VNOVAL ||
416 vap->va_gen != VNOVAL ||
417 vap->va_rmajor != VNOVAL ||
418 vap->va_bytes != VNOVAL)
421 if (error == 0 && (vap->va_flags != VNOVAL))
422 error = tmpfs_chflags(vp, vap->va_flags, cred);
424 if (error == 0 && (vap->va_size != VNOVAL))
425 error = tmpfs_chsize(vp, vap->va_size, cred);
427 if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
428 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred);
430 if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
431 error = tmpfs_chmod(vp, vap->va_mode, cred);
433 if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
434 vap->va_atime.tv_nsec != VNOVAL) ||
435 (vap->va_mtime.tv_sec != VNOVAL &&
436 vap->va_mtime.tv_nsec != VNOVAL) ))
437 error = tmpfs_chtimes(vp, &vap->va_atime, &vap->va_mtime,
438 vap->va_vaflags, cred);
440 /* Update the node times. We give preference to the error codes
441 * generated by this function rather than the ones that may arise
442 * from tmpfs_update. */
451 /* --------------------------------------------------------------------- */
454 tmpfs_fsync(struct vop_fsync_args *v)
456 struct vnode *vp = v->a_vp;
464 /* --------------------------------------------------------------------- */
467 tmpfs_read (struct vop_read_args *ap)
470 struct vnode *vp = ap->a_vp;
471 struct uio *uio = ap->a_uio;
472 struct tmpfs_node *node;
480 if (uio->uio_resid == 0) {
484 node = VP_TO_TMPFS_NODE(vp);
486 if (uio->uio_offset < 0)
488 if (vp->v_type != VREG)
491 vn_lock(vp, LK_SHARED | LK_RETRY);
494 if(curthread->td_mpcount)
502 while (uio->uio_resid > 0 && uio->uio_offset < node->tn_size) {
504 * Use buffer cache I/O (via tmpfs_strategy)
506 offset = (off_t)uio->uio_offset & BMASK;
507 base_offset = (off_t)uio->uio_offset - offset;
508 bp = getcacheblk(vp, base_offset);
511 if (got_mplock == 0) {
516 error = bread(vp, base_offset, BSIZE, &bp);
519 kprintf("tmpfs_read bread error %d\n", error);
524 if (got_mplock == 0) {
530 * Figure out how many bytes we can actually copy this loop.
532 len = BSIZE - offset;
533 if (len > uio->uio_resid)
534 len = uio->uio_resid;
535 if (len > node->tn_size - uio->uio_offset)
536 len = (size_t)(node->tn_size - uio->uio_offset);
538 error = uiomove((char *)bp->b_data + offset, len, uio);
541 kprintf("tmpfs_read uiomove error %d\n", error);
549 TMPFS_NODE_LOCK(node);
550 node->tn_status |= TMPFS_NODE_ACCESSED;
551 TMPFS_NODE_UNLOCK(node);
559 tmpfs_write (struct vop_write_args *ap)
562 struct vnode *vp = ap->a_vp;
563 struct uio *uio = ap->a_uio;
564 struct thread *td = uio->uio_td;
565 struct tmpfs_node *node;
577 if (uio->uio_resid == 0) {
581 node = VP_TO_TMPFS_NODE(vp);
583 if (vp->v_type != VREG)
586 oldsize = node->tn_size;
587 if (ap->a_ioflag & IO_APPEND)
588 uio->uio_offset = node->tn_size;
591 * Check for illegal write offsets.
593 if (uio->uio_offset + uio->uio_resid >
594 VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
597 if (vp->v_type == VREG && td != NULL) {
598 error = kern_getrlimit(RLIMIT_FSIZE, &limit);
601 if (uio->uio_offset + uio->uio_resid > limit.rlim_cur) {
602 ksignal(td->td_proc, SIGXFSZ);
609 * Extend the file's size if necessary
611 extended = (uio->uio_offset + uio->uio_resid) > node->tn_size;
613 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
615 if(curthread->td_mpcount)
625 while (uio->uio_resid > 0) {
627 * Use buffer cache I/O (via tmpfs_strategy)
629 offset = (off_t)uio->uio_offset & BMASK;
630 base_offset = (off_t)uio->uio_offset - offset;
631 len = BSIZE - offset;
632 if (len > uio->uio_resid)
633 len = uio->uio_resid;
635 if ((uio->uio_offset + len) > node->tn_size) {
636 trivial = uio->uio_offset <= node->tn_size;
637 error = tmpfs_reg_resize(vp, uio->uio_offset + len, trivial);
642 bp = getblk(vp, base_offset, BSIZE, GETBLK_BHEAVY, 0);
645 error = uiomove((char *)bp->b_data + offset, len, uio);
647 kprintf("tmpfs_write uiomove error %d\n", error);
652 if (uio->uio_offset > node->tn_size)
653 node->tn_size = uio->uio_offset;
656 * The data has been loaded into the buffer, write it out. (via tmpfs_strategy)
658 * call bdwrite() because we don't care about storage io flag (ap->a_ioflag) for a swap I/O
659 * maybe bawrite() for IO_DIRECT, bwrite() for IO_SYNC
661 * XXX: need to implement tmpfs_bmap() for a dirty bit handling of bdwrite()
665 kprintf("tmpfs_write bwrite error %d\n", error);
676 (void)tmpfs_reg_resize(vp, oldsize, trivial);
680 TMPFS_NODE_LOCK(node);
681 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
682 (extended? TMPFS_NODE_CHANGED : 0);
684 if (node->tn_mode & (S_ISUID | S_ISGID)) {
685 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
686 node->tn_mode &= ~(S_ISUID | S_ISGID);
688 TMPFS_NODE_UNLOCK(node);
696 tmpfs_advlock (struct vop_advlock_args *ap)
698 struct tmpfs_node *node;
699 struct vnode *vp = ap->a_vp;
701 node = VP_TO_TMPFS_NODE(vp);
703 return (lf_advlock(ap, &node->tn_advlock, node->tn_size));
708 tmpfs_strategy(struct vop_strategy_args *ap)
710 struct bio *bio = ap->a_bio;
711 struct vnode *vp = ap->a_vp;
712 struct tmpfs_node *node;
715 if (vp->v_type != VREG)
718 node = VP_TO_TMPFS_NODE(vp);
720 uobj = node->tn_reg.tn_aobj;
722 * call swap_pager_strategy to store vm object into swap device
724 swap_pager_strategy(uobj, bio);
730 tmpfs_bmap(struct vop_bmap_args *ap)
732 if (ap->a_doffsetp != NULL)
733 *ap->a_doffsetp = ap->a_loffset;
734 if (ap->a_runp != NULL)
736 if (ap->a_runb != NULL)
741 /* --------------------------------------------------------------------- */
744 tmpfs_nremove(struct vop_nremove_args *v)
746 struct vnode *dvp = v->a_dvp;
747 struct namecache *ncp = v->a_nch->ncp;
748 struct vnode *vp = ncp->nc_vp;
750 struct tmpfs_dirent *de;
751 struct tmpfs_mount *tmp;
752 struct tmpfs_node *dnode;
753 struct tmpfs_node *node;
755 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
756 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
758 if (vp->v_type == VDIR) {
763 dnode = VP_TO_TMPFS_DIR(dvp);
764 node = VP_TO_TMPFS_NODE(vp);
765 tmp = VFS_TO_TMPFS(vp->v_mount);
766 de = tmpfs_dir_lookup(dnode, node, ncp);
772 /* Files marked as immutable or append-only cannot be deleted. */
773 if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
774 (dnode->tn_flags & APPEND)) {
779 /* Remove the entry from the directory; as it is a file, we do not
780 * have to change the number of hard links of the directory. */
781 tmpfs_dir_detach(dvp, de);
783 /* Free the directory entry we just deleted. Note that the node
784 * referred by it will not be removed until the vnode is really
786 tmpfs_free_dirent(tmp, de, TRUE);
788 if (node->tn_links > 0) {
789 TMPFS_NODE_LOCK(node);
790 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
792 TMPFS_NODE_UNLOCK(node);
795 cache_setunresolved(v->a_nch);
796 cache_setvp(v->a_nch, NULL);
797 cache_inval_vp(vp, CINV_DESTROY);
808 /* --------------------------------------------------------------------- */
811 tmpfs_nlink(struct vop_nlink_args *v)
813 struct vnode *dvp = v->a_dvp;
814 struct vnode *vp = v->a_vp;
815 struct namecache *ncp = v->a_nch->ncp;
818 struct tmpfs_dirent *de;
819 struct tmpfs_node *node;
821 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
822 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
825 KKASSERT(dvp != vp); /* XXX When can this be false? */
827 node = VP_TO_TMPFS_NODE(vp);
829 /* XXX: Why aren't the following two tests done by the caller? */
831 /* Hard links of directories are forbidden. */
832 if (vp->v_type == VDIR) {
837 /* Cannot create cross-device links. */
838 if (dvp->v_mount != vp->v_mount) {
843 /* Ensure that we do not overflow the maximum number of links imposed
845 KKASSERT(node->tn_links <= LINK_MAX);
846 if (node->tn_links == LINK_MAX) {
851 /* We cannot create links of files marked immutable or append-only. */
852 if (node->tn_flags & (IMMUTABLE | APPEND)) {
857 /* Allocate a new directory entry to represent the node. */
858 error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
859 ncp->nc_name, ncp->nc_nlen, &de);
863 /* Insert the new directory entry into the appropriate directory. */
864 tmpfs_dir_attach(dvp, de);
866 /* vp link count has changed, so update node times. */
868 TMPFS_NODE_LOCK(node);
869 node->tn_status |= TMPFS_NODE_CHANGED;
870 TMPFS_NODE_UNLOCK(node);
873 cache_setunresolved(v->a_nch);
874 cache_setvp(v->a_nch, vp);
884 /* --------------------------------------------------------------------- */
887 tmpfs_nrename(struct vop_nrename_args *v)
889 struct vnode *fdvp = v->a_fdvp;
890 struct namecache *fncp = v->a_fnch->ncp;
891 struct vnode *fvp = fncp->nc_vp;
892 struct vnode *tdvp = v->a_tdvp;
893 struct namecache *tncp = v->a_tnch->ncp;
894 struct vnode *tvp = tncp->nc_vp;
898 struct tmpfs_dirent *de;
899 struct tmpfs_mount *tmp;
900 struct tmpfs_node *fdnode;
901 struct tmpfs_node *fnode;
902 struct tmpfs_node *tnode;
903 struct tmpfs_node *tdnode;
905 vn_lock(tdvp, LK_EXCLUSIVE | LK_RETRY);
906 if(tvp != NULL && tdvp != tvp)
907 vn_lock(tvp, LK_EXCLUSIVE | LK_RETRY);
909 tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
911 /* Disallow cross-device renames.
912 * XXX Why isn't this done by the caller? */
913 if (fvp->v_mount != tdvp->v_mount ||
914 (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
919 tmp = VFS_TO_TMPFS(tdvp->v_mount);
920 tdnode = VP_TO_TMPFS_DIR(tdvp);
922 /* If source and target are the same file, there is nothing to do. */
928 /* If we need to move the directory between entries, lock the
929 * source so that we can safely operate on it. */
931 error = vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
935 fdnode = VP_TO_TMPFS_DIR(fdvp);
936 fnode = VP_TO_TMPFS_NODE(fvp);
937 de = tmpfs_dir_lookup(fdnode, fnode, fncp);
939 /* Avoid manipulating '.' and '..' entries. */
944 KKASSERT(de->td_node == fnode);
946 /* If re-naming a directory to another preexisting directory
947 * ensure that the target directory is empty so that its
948 * removal causes no side effects.
949 * Kern_rename gurantees the destination to be a directory
950 * if the source is one. */
952 KKASSERT(tnode != NULL);
954 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
955 (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
960 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
961 if (tnode->tn_size > 0) {
965 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
968 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
972 KKASSERT(fnode->tn_type != VDIR &&
973 tnode->tn_type != VDIR);
977 if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
978 || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
983 /* Ensure that we have enough memory to hold the new name, if it
984 * has to be changed. */
985 if (fncp->nc_nlen != tncp->nc_nlen ||
986 bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
987 newname = kmalloc(tncp->nc_nlen, M_TMPFSNAME, M_WAITOK);
991 /* If the node is being moved to another directory, we have to do
993 if (fdnode != tdnode) {
994 /* In case we are moving a directory, we have to adjust its
995 * parent to point to the new parent. */
996 if (de->td_node->tn_type == VDIR) {
997 struct tmpfs_node *n;
999 /* Ensure the target directory is not a child of the
1000 * directory being moved. Otherwise, we'd end up
1001 * with stale nodes. */
1003 /* TMPFS_LOCK garanties that no nodes are freed while
1004 * traversing the list. Nodes can only be marked as
1005 * removed: tn_parent == NULL. */
1008 while (n != n->tn_dir.tn_parent) {
1009 struct tmpfs_node *parent;
1012 TMPFS_NODE_UNLOCK(n);
1015 if (newname != NULL)
1016 kfree(newname, M_TMPFSNAME);
1019 parent = n->tn_dir.tn_parent;
1020 if (parent == NULL) {
1024 TMPFS_NODE_LOCK(parent);
1025 if (parent->tn_dir.tn_parent == NULL) {
1026 TMPFS_NODE_UNLOCK(parent);
1032 TMPFS_NODE_UNLOCK(n);
1036 if (newname != NULL)
1037 kfree(newname, M_TMPFSNAME);
1041 /* Adjust the parent pointer. */
1042 TMPFS_VALIDATE_DIR(fnode);
1043 TMPFS_NODE_LOCK(de->td_node);
1044 de->td_node->tn_dir.tn_parent = tdnode;
1046 /* As a result of changing the target of the '..'
1047 * entry, the link count of the source and target
1048 * directories has to be adjusted. */
1049 TMPFS_NODE_LOCK(tdnode);
1050 TMPFS_ASSERT_LOCKED(tdnode);
1051 TMPFS_NODE_LOCK(fdnode);
1052 TMPFS_ASSERT_LOCKED(fdnode);
1057 TMPFS_NODE_UNLOCK(fdnode);
1058 TMPFS_NODE_UNLOCK(tdnode);
1059 TMPFS_NODE_UNLOCK(de->td_node);
1062 /* Do the move: just remove the entry from the source directory
1063 * and insert it into the target one. */
1064 tmpfs_dir_detach(fdvp, de);
1065 tmpfs_dir_attach(tdvp, de);
1068 /* If the name has changed, we need to make it effective by changing
1069 * it in the directory entry. */
1070 if (newname != NULL) {
1072 kfree(de->td_name, M_TMPFSNAME);
1073 de->td_namelen = (uint16_t)tncp->nc_nlen;
1074 bcopy(tncp->nc_name, newname, tncp->nc_nlen);
1075 newname[tncp->nc_nlen] = '\0';
1076 de->td_name = newname;
1078 TMPFS_NODE_LOCK(tdnode);
1079 TMPFS_NODE_LOCK(fdnode);
1081 fnode->tn_status |= TMPFS_NODE_CHANGED;
1082 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
1084 TMPFS_NODE_UNLOCK(fdnode);
1085 TMPFS_NODE_UNLOCK(tdnode);
1088 /* If we are overwriting an entry, we have to remove the old one
1089 * from the target directory. */
1091 /* Remove the old entry from the target directory. */
1092 de = tmpfs_dir_lookup(tdnode, tnode, tncp);
1093 tmpfs_dir_detach(tdvp, de);
1095 /* Free the directory entry we just deleted. Note that the
1096 * node referred by it will not be removed until the vnode is
1097 * really reclaimed. */
1098 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), de, TRUE);
1100 cache_inval_vp(tvp, CINV_DESTROY);
1103 cache_rename(v->a_fnch, v->a_tnch);
1107 if (fdnode != tdnode)
1111 /* Release target nodes. */
1112 /* XXX: I don't understand when tdvp can be the same as tvp, but
1113 * other code takes care of this... */
1125 /* --------------------------------------------------------------------- */
1128 tmpfs_nmkdir(struct vop_nmkdir_args *v)
1130 struct vnode *dvp = v->a_dvp;
1131 struct vnode **vpp = v->a_vpp;
1132 struct namecache *ncp = v->a_nch->ncp;
1133 struct vattr *vap = v->a_vap;
1134 struct ucred *cred = v->a_cred;
1137 KKASSERT(vap->va_type == VDIR);
1139 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1140 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
1142 cache_setunresolved(v->a_nch);
1143 cache_setvp(v->a_nch, *vpp);
1150 /* --------------------------------------------------------------------- */
1153 tmpfs_nrmdir(struct vop_nrmdir_args *v)
1155 struct vnode *dvp = v->a_dvp;
1156 struct namecache *ncp = v->a_nch->ncp;
1157 struct vnode *vp = ncp->nc_vp;
1160 struct tmpfs_dirent *de;
1161 struct tmpfs_mount *tmp;
1162 struct tmpfs_node *dnode;
1163 struct tmpfs_node *node;
1165 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1166 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1168 tmp = VFS_TO_TMPFS(dvp->v_mount);
1169 dnode = VP_TO_TMPFS_DIR(dvp);
1170 node = VP_TO_TMPFS_DIR(vp);
1172 /* Directories with more than two entries ('.' and '..') cannot be
1174 if (node->tn_size > 0) {
1179 if ((dnode->tn_flags & APPEND)
1180 || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
1185 /* This invariant holds only if we are not trying to remove "..".
1186 * We checked for that above so this is safe now. */
1187 KKASSERT(node->tn_dir.tn_parent == dnode);
1189 /* Get the directory entry associated with node (vp). This was
1190 * filled by tmpfs_lookup while looking up the entry. */
1191 de = tmpfs_dir_lookup(dnode, node, ncp);
1192 KKASSERT(TMPFS_DIRENT_MATCHES(de,
1196 /* Check flags to see if we are allowed to remove the directory. */
1197 if (dnode->tn_flags & APPEND
1198 || node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
1204 /* Detach the directory entry from the directory (dnode). */
1205 tmpfs_dir_detach(dvp, de);
1207 /* No vnode should be allocated for this entry from this point */
1208 TMPFS_NODE_LOCK(node);
1209 TMPFS_ASSERT_ELOCKED(node);
1210 TMPFS_NODE_LOCK(dnode);
1211 TMPFS_ASSERT_ELOCKED(dnode);
1214 node->tn_dir.tn_parent = NULL;
1215 node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
1216 TMPFS_NODE_MODIFIED;
1219 dnode->tn_status |= TMPFS_NODE_ACCESSED | \
1220 TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
1222 TMPFS_NODE_UNLOCK(dnode);
1223 TMPFS_NODE_UNLOCK(node);
1225 /* Free the directory entry we just deleted. Note that the node
1226 * referred by it will not be removed until the vnode is really
1228 tmpfs_free_dirent(tmp, de, TRUE);
1230 /* Release the deleted vnode (will destroy the node, notify
1231 * interested parties and clean it from the cache). */
1233 TMPFS_NODE_LOCK(dnode);
1234 dnode->tn_status |= TMPFS_NODE_CHANGED;
1235 TMPFS_NODE_UNLOCK(dnode);
1238 cache_setunresolved(v->a_nch);
1239 cache_setvp(v->a_nch, NULL);
1240 cache_inval_vp(vp, CINV_DESTROY);
1250 /* --------------------------------------------------------------------- */
1253 tmpfs_nsymlink(struct vop_nsymlink_args *v)
1255 struct vnode *dvp = v->a_dvp;
1256 struct vnode **vpp = v->a_vpp;
1257 struct namecache *ncp = v->a_nch->ncp;
1258 struct vattr *vap = v->a_vap;
1259 struct ucred *cred = v->a_cred;
1260 char *target = v->a_target;
1263 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
1264 vap->va_type = VLNK;
1265 error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
1267 cache_setunresolved(v->a_nch);
1268 cache_setvp(v->a_nch, *vpp);
1275 /* --------------------------------------------------------------------- */
1278 tmpfs_readdir(struct vop_readdir_args *v)
1280 struct vnode *vp = v->a_vp;
1281 struct uio *uio = v->a_uio;
1282 int *eofflag = v->a_eofflag;
1283 off_t **cookies = v->a_cookies;
1284 int *ncookies = v->a_ncookies;
1289 struct tmpfs_node *node;
1291 /* This operation only makes sense on directory nodes. */
1292 if (vp->v_type != VDIR)
1295 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1297 node = VP_TO_TMPFS_DIR(vp);
1298 startoff = uio->uio_offset;
1300 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
1301 error = tmpfs_dir_getdotdent(node, uio);
1307 if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
1308 error = tmpfs_dir_getdotdotdent(node, uio);
1314 error = tmpfs_dir_getdents(node, uio, &cnt);
1317 KKASSERT(error >= -1);
1322 if (eofflag != NULL)
1324 (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
1326 /* Update NFS-related variables. */
1327 if (error == 0 && cookies != NULL && ncookies != NULL) {
1329 off_t off = startoff;
1330 struct tmpfs_dirent *de = NULL;
1333 *cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
1335 for (i = 0; i < cnt; i++) {
1336 KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
1337 if (off == TMPFS_DIRCOOKIE_DOT) {
1338 off = TMPFS_DIRCOOKIE_DOTDOT;
1340 if (off == TMPFS_DIRCOOKIE_DOTDOT) {
1341 de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
1342 } else if (de != NULL) {
1343 de = TAILQ_NEXT(de, td_entries);
1345 de = tmpfs_dir_lookupbycookie(node,
1347 KKASSERT(de != NULL);
1348 de = TAILQ_NEXT(de, td_entries);
1351 off = TMPFS_DIRCOOKIE_EOF;
1353 off = tmpfs_dircookie(de);
1356 (*cookies)[i] = off;
1358 KKASSERT(uio->uio_offset == off);
1365 /* --------------------------------------------------------------------- */
1368 tmpfs_readlink(struct vop_readlink_args *v)
1370 struct vnode *vp = v->a_vp;
1371 struct uio *uio = v->a_uio;
1374 struct tmpfs_node *node;
1376 KKASSERT(uio->uio_offset == 0);
1377 KKASSERT(vp->v_type == VLNK);
1379 node = VP_TO_TMPFS_NODE(vp);
1381 error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
1383 TMPFS_NODE_LOCK(node);
1384 node->tn_status |= TMPFS_NODE_ACCESSED;
1385 TMPFS_NODE_UNLOCK(node);
1390 /* --------------------------------------------------------------------- */
1393 tmpfs_inactive(struct vop_inactive_args *v)
1395 struct vnode *vp = v->a_vp;
1397 struct tmpfs_node *node;
1399 KKASSERT(vn_islocked(vp));
1401 node = VP_TO_TMPFS_NODE(vp);
1403 TMPFS_NODE_LOCK(node);
1404 if (node->tn_links == 0 &&
1405 (node->tn_vpstate & TMPFS_VNODE_DOOMED)) {
1406 TMPFS_NODE_UNLOCK(node);
1410 TMPFS_NODE_UNLOCK(node);
1415 /* --------------------------------------------------------------------- */
1418 tmpfs_reclaim(struct vop_reclaim_args *v)
1420 struct vnode *vp = v->a_vp;
1422 struct tmpfs_mount *tmp;
1423 struct tmpfs_node *node;
1425 node = VP_TO_TMPFS_NODE(vp);
1426 tmp = VFS_TO_TMPFS(vp->v_mount);
1428 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
1431 /* If the node referenced by this vnode was deleted by the user,
1432 * we must free its associated data structures (now that the vnode
1433 * is being reclaimed). */
1434 TMPFS_NODE_LOCK(node);
1435 if (node->tn_links == 0 &&
1436 (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
1437 node->tn_vpstate = TMPFS_VNODE_DOOMED;
1438 TMPFS_NODE_UNLOCK(node);
1439 tmpfs_free_node(tmp, node);
1442 TMPFS_NODE_UNLOCK(node);
1446 KKASSERT(vp->v_data == NULL);
1450 /* --------------------------------------------------------------------- */
1453 tmpfs_print(struct vop_print_args *v)
1455 struct vnode *vp = v->a_vp;
1457 struct tmpfs_node *node;
1459 node = VP_TO_TMPFS_NODE(vp);
1461 kprintf("tag VT_TMPFS, tmpfs_node %p, flags 0x%x, links %d\n",
1462 node, node->tn_flags, node->tn_links);
1463 kprintf("\tmode 0%o, owner %d, group %d, size %ju, status 0x%x\n",
1464 node->tn_mode, node->tn_uid, node->tn_gid,
1465 (uintmax_t)node->tn_size, node->tn_status);
1467 if (vp->v_type == VFIFO)
1475 /* --------------------------------------------------------------------- */
1478 tmpfs_pathconf(struct vop_pathconf_args *v)
1480 int name = v->a_name;
1481 register_t *retval = v->a_retval;
1504 case _PC_CHOWN_RESTRICTED:
1516 case _PC_FILESIZEBITS:
1517 *retval = 0; /* XXX Don't know which value should I return. */
1527 /* --------------------------------------------------------------------- */
1530 * vnode operations vector used for files stored in a tmpfs file system.
1532 struct vop_ops tmpfs_vnode_vops = {
1533 .vop_default = vop_defaultop,
1534 .vop_getpages = vop_stdgetpages,
1535 .vop_putpages = vop_stdputpages,
1536 .vop_ncreate = tmpfs_ncreate,
1537 .vop_nresolve = tmpfs_nresolve,
1538 .vop_nlookupdotdot = tmpfs_nlookupdotdot,
1539 .vop_nmknod = tmpfs_nmknod,
1540 .vop_open = tmpfs_open,
1541 .vop_close = tmpfs_close,
1542 .vop_access = tmpfs_access,
1543 .vop_getattr = tmpfs_getattr,
1544 .vop_setattr = tmpfs_setattr,
1545 .vop_read = tmpfs_read,
1546 .vop_write = tmpfs_write,
1547 .vop_fsync = tmpfs_fsync,
1548 .vop_nremove = tmpfs_nremove,
1549 .vop_nlink = tmpfs_nlink,
1550 .vop_nrename = tmpfs_nrename,
1551 .vop_nmkdir = tmpfs_nmkdir,
1552 .vop_nrmdir = tmpfs_nrmdir,
1553 .vop_nsymlink = tmpfs_nsymlink,
1554 .vop_readdir = tmpfs_readdir,
1555 .vop_readlink = tmpfs_readlink,
1556 .vop_inactive = tmpfs_inactive,
1557 .vop_reclaim = tmpfs_reclaim,
1558 .vop_print = tmpfs_print,
1559 .vop_pathconf = tmpfs_pathconf,
1560 // .vop_bmap = tmpfs_bmap,
1561 .vop_bmap = (void *)vop_eopnotsupp,
1562 .vop_strategy = tmpfs_strategy,
1563 .vop_advlock = tmpfs_advlock,