317 lines
7.3 KiB
Groff
317 lines
7.3 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1996 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 24, 1996
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.Os
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.Dt VOP_RENAME 9
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.Sh NAME
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.Nm VOP_RENAME
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.Nd rename a file
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.Ft int
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.Fn VOP_RENAME "struct vnode *fdvp" "struct vnode *fvp" "struct componentname *fcnp" "struct vnode *tdvp" "struct vnode *tvp" "struct componentname *tcnp"
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.Sh DESCRIPTION
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This renames a file and possibly changes its parent directory.
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If the destination object exists, it will be removed first.
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.Pp
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Its arguments are:
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.Bl -tag -width fdvp
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.It Fa fdvp
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the vnode of the old parent directory
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.It Fa fvp
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the vnode of the file to be renamed
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.It Fa fcnp
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pathname information about the file's current name
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.It Fa tdvp
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the vnode of the new parent directory
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.It Fa tvp
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the vnode of the target file (if it exists)
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.It Fa tcnp
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pathname information about the file's new name
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.El
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.Sh LOCKS
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The source directory and file are unlocked but are expected to have their
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ref count bumped on entry.
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The VOP routine is expected to
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.Xr vrele 9
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both prior
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to returning.
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.Pp
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The destination directory and file are locked as well as having their ref
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count bumped.
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The VOP routine is expected to
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.Xr vput 9
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both prior to
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returning.
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.Sh PSEUDOCODE
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.Bd -literal
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int
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vop_rename(struct vnode *fdvp, struct vnode *fvp, struct componentname *fcnp,
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struct vnode *tdvp, struct vnode *tvp, struct componentname *tcnp)
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{
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int doingdirectory = 0;
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int error = 0;
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/*
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* Check for cross-device rename.
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*/
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if (fvp->v_mount != tdvp->v_mount) {
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error = EXDEV;
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abortit:
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if (tdvp == tvp)
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vrele(tdvp);
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else
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vput(tdvp);
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if (tvp)
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vput(tvp);
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vrele(fdvp);
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vrele(fvp);
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return error;
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}
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if (tvp exists and is immutable) {
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error = EPERM;
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goto abortit;
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}
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/*
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* Check if just deleting a link name.
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*/
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if (fvp == tvp) {
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if (fvp->v_type == VDIR) {
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error = EINVAL;
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goto abortit;
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}
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/*
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* Release destination.
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*/
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vput(tdvp);
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vput(tvp);
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/*
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* Delete source. Pretty bizarre stuff.
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*/
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vrele(fdvp);
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vrele(fvp);
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fcnp->cn_flags &= ~MODMASK;
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fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
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fcnp->cn_nameiop = DELETE;
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VREF(fdvp);
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error = relookup(fdvp, &fvp, fcnp);
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if (error == 0)
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vrele(fdvp);
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return VOP_REMOVE(fdvp, fvp, fcnp);
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}
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if (fvp is immutable) {
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error = EPERM;
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goto abortit;
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}
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error = VOP_LOCK(fvp);
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if (error)
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goto abortit;
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if (vp is a directory) {
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/*
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* Avoid ".", "..", and aliases of "." for obvious reasons.
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*/
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if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.')
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|| fdvp == fvp
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|| ((fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT)) {
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VOP_UNLOCK(fvp);
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error = EINVAL;
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goto abortit;
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}
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doingdirectory = 1;
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}
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vrele(fdvp);
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/*
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* Bump link count on fvp while we are moving stuff around. If we
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* crash before completing the work, the link count may be wrong
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* but correctable.
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*/
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...;
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/*
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* If ".." must be changed (ie the directory gets a new
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* parent) then the source directory must not be in the
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* directory hierarchy above the target, as this would
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* orphan everything below the source directory. Also
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* the user must have write permission in the source so
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* as to be able to change "..".
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*/
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error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
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VOP_UNLOCK(fvp);
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if (doingdirectory && fdvp != tdvp) {
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/*
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* Check for pathname conflict.
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*/
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...;
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}
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/*
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* If the target doesn't exist, link the target to the source and
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* unlink the source. Otherwise, rewrite the target directory to
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* reference the source and remove the original entry.
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*/
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if (tvp == NULL) {
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/*
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* Account for ".." in new directory.
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*/
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if (doingdirectory && fdvp != tdvp) {
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/*
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* Increase link count of tdvp.
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*/
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...;
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}
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/*
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* Add name in new directory.
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*/
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...;
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if (error) {
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if (doingdirectory && fdvp != tdvp) {
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/*
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* Decrease link count if tdvp.
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*/
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...;
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}
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goto bad;
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}
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vput(tdvp);
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} else {
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/*
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* Target must be empty if a directory and have no links
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* to it. Also, ensure source and target are compatible
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* (both directories, or both not directories).
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*/
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if (tvp is a directory) {
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if (tvp is not empty) {
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error = ENOTEMPTY;
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goto bad;
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}
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if (!doingdirectory) {
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error = ENOTDIR;
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goto bad;
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}
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/*
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* Update name cache since directory is going away.
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*/
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cache_purge(tdvp);
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} else if (doingdirectory) {
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error = ENOTDIR;
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goto bad;
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}
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/*
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* Change name tcnp in tdvp to point at fvp.
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*/
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...;
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/*
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* If the target directory is in same directory as the source
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* directory, decrement the link count on the parent of the
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* target directory. This accounts for the fact that a
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* directory links back to its parent with "..".
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*/
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if (doingdirectory && fdvp == tdvp) {
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/*
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* Decrement link count of tdvp.
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*/
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...;
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}
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vput(tdvp);
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/*
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* Decrement the link count of tvp since the directory no
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* longer points at it.
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*/
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...;
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if (doingdirectory) {
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/*
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* Clean up the old directory tvp.
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*/
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...;
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}
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vput(tvp);
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}
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/*
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* Unlink the source. If a directory was moved to a new parent,
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* update its ".." entry. Gobs of ugly UFS code omitted here.
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*/
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...;
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bad:
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if (tvp)
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vput(tvp);
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vput(tdvp);
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out:
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if (VOP_LOCK(fvp) == 0) {
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/*
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* Decrement link count of fvp.
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*/
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...;
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vput(fvp);
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} else
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vrele(fvp);
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return error;
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}
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.Ed
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EPERM
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The file is immutable.
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.It Bq Er EXDEV
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It is not possible to rename a file between different file systems.
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.It Bq Er EINVAL
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An attempt was made to rename
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.Pa \&.
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or
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.Pa .. ,
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or to perform an operation which would break the directory tree structure.
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.It Bq Er ENOTDIR
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An attempt was made to rename a directory to a file or vice versa.
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.It Bq Er ENOTEMPTY
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An attempt was made to remove a directory which is not empty.
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.El
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.Sh SEE ALSO
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.Xr vnode 9
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.Sh AUTHORS
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This manual page was written by
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.An Doug Rabson .
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