/*
* vop_compat_nrename { struct nchandle *a_fnch, XXX STOPGAP FUNCTION
* struct nchandle *a_tnch,
* struct ucred *a_cred }
*
* This is a fairly difficult procedure. The old VOP_OLD_RENAME requires that
* the source directory and vnode be unlocked and the target directory and
* vnode (if it exists) be locked. All arguments will be vrele'd and
* the targets will also be unlocked regardless of the return code.
*/
int
vop_compat_nrename(struct vop_nrename_args *ap)
{
struct thread *td = curthread;
struct componentname fcnp;
struct componentname tcnp;
struct nchandle *fnch;
struct nchandle *tnch;
struct namecache *fncp;
struct namecache *tncp;
struct vnode *fdvp, *fvp;
struct vnode *tdvp, *tvp;
int error;
/*
* Sanity checks, get referenced vnodes representing the source.
*/
fnch = ap->a_fnch; /* locked namecache node */
fncp = fnch->ncp;
fdvp = ap->a_fdvp;
/*
* Temporarily lock the source directory and lookup in DELETE mode to
* check permissions. XXX delete permissions should have been
* checked by nlookup(), we need to add NLC_DELETE for delete
* checking. It is unclear whether VFS's require the directory setup
* info NAMEI_DELETE causes to be stored in the fdvp's inode, but
* since it isn't locked and since UFS always does a relookup of
* the source, it is believed that the only side effect that matters
* is the permissions check.
*/
if ((error = vget(fdvp, LK_EXCLUSIVE)) != 0) {
kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n",
fncp, fncp->nc_name);
return(EAGAIN);
}
bzero(&fcnp, sizeof(fcnp));
fcnp.cn_nameiop = NAMEI_DELETE;
fcnp.cn_flags = CNP_LOCKPARENT;
fcnp.cn_nameptr = fncp->nc_name;
fcnp.cn_namelen = fncp->nc_nlen;
fcnp.cn_cred = ap->a_cred;
fcnp.cn_td = td;
/*
* note: vop_old_lookup (i.e. VOP_OLD_LOOKUP) always returns a locked
* fvp.
*/
fvp = NULL;
error = vop_old_lookup(ap->a_head.a_ops, fdvp, &fvp, &fcnp);
if (error == 0 && (fvp->v_flag & VROOT)) {
vput(fvp); /* as if vop_old_lookup had failed */
error = EBUSY;
}
if ((fcnp.cn_flags & CNP_PDIRUNLOCK) == 0) {
fcnp.cn_flags |= CNP_PDIRUNLOCK;
vn_unlock(fdvp);
}
if (error) {
vrele(fdvp);
return (error);
}
vn_unlock(fvp);
/*
* fdvp and fvp are now referenced and unlocked.
*
* Get a locked directory vnode for the target and lookup the target
* in CREATE mode so it places the required information in the
* directory inode.
*/
tnch = ap->a_tnch; /* locked namecache node */
tncp = tnch->ncp;
tdvp = ap->a_tdvp;
if (error) {
vrele(fdvp);
vrele(fvp);
return (error);
}
if ((error = vget(tdvp, LK_EXCLUSIVE)) != 0) {
kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n",
tncp, tncp->nc_name);
vrele(fdvp);
vrele(fvp);
return(EAGAIN);
}
/*
* Setup the cnp for a traditional vop_old_lookup() call. The lookup
* caches all information required to create the entry in the
* target directory inode.
*/
bzero(&tcnp, sizeof(tcnp));
tcnp.cn_nameiop = NAMEI_RENAME;
tcnp.cn_flags = CNP_LOCKPARENT;
tcnp.cn_nameptr = tncp->nc_name;
tcnp.cn_namelen = tncp->nc_nlen;
tcnp.cn_cred = ap->a_cred;
tcnp.cn_td = td;
tvp = NULL;
error = vop_old_lookup(ap->a_head.a_ops, tdvp, &tvp, &tcnp);
if (error == EJUSTRETURN) {
/*
* Target does not exist. tvp should be NULL.
*/
KKASSERT(tvp == NULL);
KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0);
error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp);
if (error == 0)
cache_rename(fnch, tnch);
} else if (error == 0) {
/*
* Target exists. VOP_OLD_RENAME should correctly delete the
* target.
*/
KKASSERT((tcnp.cn_flags & CNP_PDIRUNLOCK) == 0);
error = VOP_OLD_RENAME(fdvp, fvp, &fcnp, tdvp, tvp, &tcnp);
if (error == 0)
cache_rename(fnch, tnch);
} else {
vrele(fdvp);
vrele(fvp);
if (tcnp.cn_flags & CNP_PDIRUNLOCK)
vrele(tdvp);
else
vput(tdvp);
}
return (error);
}
static int
tmpfs_nrename(struct vop_nrename_args *v)
{
struct vnode *fdvp = v->a_fdvp;
struct namecache *fncp = v->a_fnch->ncp;
struct vnode *fvp = fncp->nc_vp;
struct vnode *tdvp = v->a_tdvp;
struct namecache *tncp = v->a_tnch->ncp;
struct vnode *tvp;
struct tmpfs_dirent *de, *tde;
struct tmpfs_mount *tmp;
struct tmpfs_node *fdnode;
struct tmpfs_node *fnode;
struct tmpfs_node *tnode;
struct tmpfs_node *tdnode;
struct mount *mp;
char *newname;
char *oldname;
int error;
mp = fdvp->v_mount;
KKASSERT(fdvp->v_mount == fvp->v_mount);
/*
* Because tvp can get overwritten we have to vget it instead of
* just vref or use it, otherwise it's VINACTIVE flag may not get
* cleared and the node won't get destroyed.
*/
error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp);
if (error == 0) {
tnode = VP_TO_TMPFS_NODE(tvp);
vn_unlock(tvp);
} else {
tnode = NULL;
}
/* Disallow cross-device renames.
* XXX Why isn't this done by the caller? */
if (fvp->v_mount != tdvp->v_mount ||
(tvp != NULL && fvp->v_mount != tvp->v_mount)) {
error = EXDEV;
goto out;
}
tmp = VFS_TO_TMPFS(tdvp->v_mount);
tdnode = VP_TO_TMPFS_DIR(tdvp);
/* If source and target are the same file, there is nothing to do. */
if (fvp == tvp) {
error = 0;
goto out;
}
fdnode = VP_TO_TMPFS_DIR(fdvp);
fnode = VP_TO_TMPFS_NODE(fvp);
TMPFS_NODE_LOCK(fdnode);
de = tmpfs_dir_lookup(fdnode, fnode, fncp);
TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */
/* Avoid manipulating '.' and '..' entries. */
if (de == NULL) {
error = ENOENT;
goto out_locked;
}
KKASSERT(de->td_node == fnode);
/*
* If replacing an entry in the target directory and that entry
* is a directory, it must be empty.
*
* Kern_rename gurantees the destination to be a directory
* if the source is one (it does?).
*/
if (tvp != NULL) {
KKASSERT(tnode != NULL);
if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(tdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
if (tnode->tn_size > 0) {
error = ENOTEMPTY;
goto out_locked;
}
} else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
error = ENOTDIR;
goto out_locked;
} else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
error = EISDIR;
goto out_locked;
} else {
KKASSERT(fnode->tn_type != VDIR &&
tnode->tn_type != VDIR);
}
}
if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(fdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
/*
* Ensure that we have enough memory to hold the new name, if it
* has to be changed.
*/
if (fncp->nc_nlen != tncp->nc_nlen ||
bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone,
M_WAITOK | M_NULLOK);
if (newname == NULL) {
error = ENOSPC;
goto out_locked;
}
bcopy(tncp->nc_name, newname, tncp->nc_nlen);
newname[tncp->nc_nlen] = '\0';
} else {
newname = NULL;
}
/*
* Unlink entry from source directory. Note that the kernel has
* already checked for illegal recursion cases (renaming a directory
* into a subdirectory of itself).
*/
if (fdnode != tdnode) {
tmpfs_dir_detach(fdnode, de);
} else {
/* XXX depend on namecache lock */
TMPFS_NODE_LOCK(fdnode);
KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp));
RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de);
RB_REMOVE(tmpfs_dirtree_cookie,
&fdnode->tn_dir.tn_cookietree, de);
TMPFS_NODE_UNLOCK(fdnode);
}
/*
* Handle any name change. Swap with newname, we will
* deallocate it at the end.
*/
if (newname != NULL) {
#if 0
TMPFS_NODE_LOCK(fnode);
fnode->tn_status |= TMPFS_NODE_CHANGED;
TMPFS_NODE_UNLOCK(fnode);
#endif
oldname = de->td_name;
de->td_name = newname;
de->td_namelen = (uint16_t)tncp->nc_nlen;
newname = oldname;
}
/*
* If we are overwriting an entry, we have to remove the old one
* from the target directory.
*/
if (tvp != NULL) {
/* Remove the old entry from the target directory. */
TMPFS_NODE_LOCK(tdnode);
tde = tmpfs_dir_lookup(tdnode, tnode, tncp);
tmpfs_dir_detach(tdnode, tde);
TMPFS_NODE_UNLOCK(tdnode);
tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE);
/*
* Free the directory entry we just deleted. Note that the
* node referred by it will not be removed until the vnode is
* really reclaimed.
*/
tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
/*cache_inval_vp(tvp, CINV_DESTROY);*/
}
/*
* Link entry to target directory. If the entry
* represents a directory move the parent linkage
* as well.
*/
if (fdnode != tdnode) {
if (de->td_node->tn_type == VDIR) {
TMPFS_VALIDATE_DIR(fnode);
}
tmpfs_dir_attach(tdnode, de);
} else {
TMPFS_NODE_LOCK(tdnode);
tdnode->tn_status |= TMPFS_NODE_MODIFIED;
RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de);
RB_INSERT(tmpfs_dirtree_cookie,
&tdnode->tn_dir.tn_cookietree, de);
TMPFS_NODE_UNLOCK(tdnode);
}
/*
* Finish up
*/
if (newname) {
kfree(newname, tmp->tm_name_zone);
newname = NULL;
}
cache_rename(v->a_fnch, v->a_tnch);
tmpfs_knote(v->a_fdvp, NOTE_WRITE);
tmpfs_knote(v->a_tdvp, NOTE_WRITE);
if (fnode->tn_vnode)
tmpfs_knote(fnode->tn_vnode, NOTE_RENAME);
error = 0;
out_locked:
;
out:
if (tvp)
vrele(tvp);
return error;
}
static int
puffs_vnop_rename(struct vop_nrename_args *ap)
{
PUFFS_MSG_VARS(vn, rename);
struct nchandle *fnch = ap->a_fnch;
struct nchandle *tnch = ap->a_tnch;
struct vnode *fdvp = ap->a_fdvp;
struct vnode *fvp = fnch->ncp->nc_vp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *tvp = tnch->ncp->nc_vp;
struct ucred *cred = ap->a_cred;
struct puffs_mount *pmp = MPTOPUFFSMP(fdvp->v_mount);
int error;
if (!EXISTSOP(pmp, RENAME))
return EOPNOTSUPP;
error = vget(tdvp, LK_EXCLUSIVE);
if (error != 0) {
DPRINTF(("puffs_vnop_rename: EAGAIN on tdvp vnode %p %s\n",
tdvp, tnch->ncp->nc_name));
return EAGAIN;
}
if (tvp != NULL) {
error = vget(tvp, LK_EXCLUSIVE);
if (error != 0) {
DPRINTF(("puffs_vnop_rename: EAGAIN on tvp vnode %p %s\n",
tvp, tnch->ncp->nc_name));
vput(tdvp);
return EAGAIN;
}
}
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
goto out;
}
if (tvp) {
if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
error = ENOTDIR;
goto out;
} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
error = EISDIR;
goto out;
}
}
PUFFS_MSG_ALLOC(vn, rename);
rename_msg->pvnr_cookie_src = VPTOPNC(fvp);
rename_msg->pvnr_cookie_targdir = VPTOPNC(tdvp);
if (tvp)
rename_msg->pvnr_cookie_targ = VPTOPNC(tvp);
else
rename_msg->pvnr_cookie_targ = NULL;
puffs_makecn(&rename_msg->pvnr_cn_src, &rename_msg->pvnr_cn_src_cred,
fnch->ncp, cred);
puffs_makecn(&rename_msg->pvnr_cn_targ, &rename_msg->pvnr_cn_targ_cred,
tnch->ncp, cred);
puffs_msg_setinfo(park_rename, PUFFSOP_VN,
PUFFS_VN_RENAME, VPTOPNC(fdvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_rename, fdvp->v_data, NULL, error);
PUFFS_MSG_RELEASE(rename);
error = checkerr(pmp, error, __func__);
if (error == 0)
puffs_updatenode(VPTOPP(fvp), PUFFS_UPDATECTIME);
out:
if (tvp != NULL)
vn_unlock(tvp);
if (tdvp != tvp)
vn_unlock(tdvp);
if (error == 0)
cache_rename(fnch, tnch);
if (tvp != NULL)
vrele(tvp);
vrele(tdvp);
return error;
}
