706f80801d
a vnode until it is verified that the vnode indeed belongs to tmpfs mount. Otherwise, it might access random memory, at least in the debug kernel. Reported and tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
1428 lines
34 KiB
C
1428 lines
34 KiB
C
/* $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $ */
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/*-
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* Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal, developed as part of Google's Summer of Code
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* 2005 program.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* tmpfs vnode interface.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/fcntl.h>
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#include <sys/lockf.h>
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#include <sys/lock.h>
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#include <sys/namei.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/sched.h>
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#include <sys/sf_buf.h>
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#include <sys/stat.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <fs/tmpfs/tmpfs_vnops.h>
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#include <fs/tmpfs/tmpfs.h>
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SYSCTL_DECL(_vfs_tmpfs);
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static volatile int tmpfs_rename_restarts;
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SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
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__DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
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"Times rename had to restart due to lock contention");
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static int
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tmpfs_lookup(struct vop_cachedlookup_args *v)
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{
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struct vnode *dvp = v->a_dvp;
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struct vnode **vpp = v->a_vpp;
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struct componentname *cnp = v->a_cnp;
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int error;
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struct tmpfs_dirent *de;
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struct tmpfs_node *dnode;
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dnode = VP_TO_TMPFS_DIR(dvp);
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*vpp = NULLVP;
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/* Check accessibility of requested node as a first step. */
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error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
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if (error != 0)
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goto out;
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/* We cannot be requesting the parent directory of the root node. */
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MPASS(IMPLIES(dnode->tn_type == VDIR &&
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dnode->tn_dir.tn_parent == dnode,
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!(cnp->cn_flags & ISDOTDOT)));
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TMPFS_ASSERT_LOCKED(dnode);
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if (dnode->tn_dir.tn_parent == NULL) {
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error = ENOENT;
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goto out;
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}
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if (cnp->cn_flags & ISDOTDOT) {
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int ltype = 0;
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ltype = VOP_ISLOCKED(dvp);
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vhold(dvp);
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VOP_UNLOCK(dvp, 0);
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/* Allocate a new vnode on the matching entry. */
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error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
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cnp->cn_lkflags, vpp);
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vn_lock(dvp, ltype | LK_RETRY);
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vdrop(dvp);
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} else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
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VREF(dvp);
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*vpp = dvp;
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error = 0;
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} else {
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de = tmpfs_dir_lookup(dnode, NULL, cnp);
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if (de != NULL && de->td_node == NULL)
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cnp->cn_flags |= ISWHITEOUT;
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if (de == NULL || de->td_node == NULL) {
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/* The entry was not found in the directory.
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* This is OK if we are creating or renaming an
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* entry and are working on the last component of
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* the path name. */
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if ((cnp->cn_flags & ISLASTCN) &&
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(cnp->cn_nameiop == CREATE || \
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cnp->cn_nameiop == RENAME ||
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(cnp->cn_nameiop == DELETE &&
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cnp->cn_flags & DOWHITEOUT &&
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cnp->cn_flags & ISWHITEOUT))) {
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error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
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cnp->cn_thread);
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if (error != 0)
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goto out;
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/* Keep the component name in the buffer for
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* future uses. */
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cnp->cn_flags |= SAVENAME;
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error = EJUSTRETURN;
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} else
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error = ENOENT;
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} else {
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struct tmpfs_node *tnode;
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/* The entry was found, so get its associated
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* tmpfs_node. */
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tnode = de->td_node;
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/* If we are not at the last path component and
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* found a non-directory or non-link entry (which
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* may itself be pointing to a directory), raise
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* an error. */
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if ((tnode->tn_type != VDIR &&
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tnode->tn_type != VLNK) &&
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!(cnp->cn_flags & ISLASTCN)) {
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error = ENOTDIR;
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goto out;
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}
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/* If we are deleting or renaming the entry, keep
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* track of its tmpfs_dirent so that it can be
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* easily deleted later. */
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if ((cnp->cn_flags & ISLASTCN) &&
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(cnp->cn_nameiop == DELETE ||
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cnp->cn_nameiop == RENAME)) {
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error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
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cnp->cn_thread);
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if (error != 0)
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goto out;
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/* Allocate a new vnode on the matching entry. */
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error = tmpfs_alloc_vp(dvp->v_mount, tnode,
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cnp->cn_lkflags, vpp);
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if (error != 0)
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goto out;
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if ((dnode->tn_mode & S_ISTXT) &&
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VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
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VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
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error = EPERM;
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vput(*vpp);
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*vpp = NULL;
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goto out;
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}
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cnp->cn_flags |= SAVENAME;
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} else {
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error = tmpfs_alloc_vp(dvp->v_mount, tnode,
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cnp->cn_lkflags, vpp);
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}
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}
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}
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/* Store the result of this lookup in the cache. Avoid this if the
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* request was for creation, as it does not improve timings on
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* emprical tests. */
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if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
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cache_enter(dvp, *vpp, cnp);
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out:
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/* If there were no errors, *vpp cannot be null and it must be
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* locked. */
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MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
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return error;
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}
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static int
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tmpfs_create(struct vop_create_args *v)
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{
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struct vnode *dvp = v->a_dvp;
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struct vnode **vpp = v->a_vpp;
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struct componentname *cnp = v->a_cnp;
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struct vattr *vap = v->a_vap;
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MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
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return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
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}
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static int
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tmpfs_mknod(struct vop_mknod_args *v)
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{
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struct vnode *dvp = v->a_dvp;
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struct vnode **vpp = v->a_vpp;
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struct componentname *cnp = v->a_cnp;
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struct vattr *vap = v->a_vap;
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if (vap->va_type != VBLK && vap->va_type != VCHR &&
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vap->va_type != VFIFO)
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return EINVAL;
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return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
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}
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static int
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tmpfs_open(struct vop_open_args *v)
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{
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struct vnode *vp = v->a_vp;
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int mode = v->a_mode;
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int error;
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struct tmpfs_node *node;
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MPASS(VOP_ISLOCKED(vp));
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node = VP_TO_TMPFS_NODE(vp);
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/* The file is still active but all its names have been removed
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* (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
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* it is about to die. */
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if (node->tn_links < 1)
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return (ENOENT);
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/* If the file is marked append-only, deny write requests. */
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if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
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error = EPERM;
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else {
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error = 0;
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/* For regular files, the call below is nop. */
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vnode_create_vobject(vp, node->tn_size, v->a_td);
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}
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MPASS(VOP_ISLOCKED(vp));
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return error;
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}
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static int
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tmpfs_close(struct vop_close_args *v)
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{
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struct vnode *vp = v->a_vp;
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/* Update node times. */
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tmpfs_update(vp);
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return (0);
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}
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int
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tmpfs_access(struct vop_access_args *v)
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{
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struct vnode *vp = v->a_vp;
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accmode_t accmode = v->a_accmode;
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struct ucred *cred = v->a_cred;
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int error;
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struct tmpfs_node *node;
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MPASS(VOP_ISLOCKED(vp));
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node = VP_TO_TMPFS_NODE(vp);
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switch (vp->v_type) {
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case VDIR:
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/* FALLTHROUGH */
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case VLNK:
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/* FALLTHROUGH */
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case VREG:
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if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
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error = EROFS;
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goto out;
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}
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break;
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case VBLK:
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/* FALLTHROUGH */
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case VCHR:
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/* FALLTHROUGH */
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case VSOCK:
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/* FALLTHROUGH */
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case VFIFO:
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break;
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default:
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error = EINVAL;
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goto out;
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}
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|
|
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if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
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error = EPERM;
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goto out;
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}
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|
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error = vaccess(vp->v_type, node->tn_mode, node->tn_uid,
|
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node->tn_gid, accmode, cred, NULL);
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out:
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MPASS(VOP_ISLOCKED(vp));
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return error;
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}
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|
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int
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tmpfs_getattr(struct vop_getattr_args *v)
|
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{
|
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struct vnode *vp = v->a_vp;
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struct vattr *vap = v->a_vap;
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|
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struct tmpfs_node *node;
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node = VP_TO_TMPFS_NODE(vp);
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tmpfs_update(vp);
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|
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vap->va_type = vp->v_type;
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vap->va_mode = node->tn_mode;
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vap->va_nlink = node->tn_links;
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vap->va_uid = node->tn_uid;
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vap->va_gid = node->tn_gid;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
|
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vap->va_fileid = node->tn_id;
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vap->va_size = node->tn_size;
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vap->va_blocksize = PAGE_SIZE;
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vap->va_atime = node->tn_atime;
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vap->va_mtime = node->tn_mtime;
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vap->va_ctime = node->tn_ctime;
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vap->va_birthtime = node->tn_birthtime;
|
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vap->va_gen = node->tn_gen;
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vap->va_flags = node->tn_flags;
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vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
|
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node->tn_rdev : NODEV;
|
|
vap->va_bytes = round_page(node->tn_size);
|
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vap->va_filerev = 0;
|
|
|
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return 0;
|
|
}
|
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|
|
int
|
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tmpfs_setattr(struct vop_setattr_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
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struct vattr *vap = v->a_vap;
|
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struct ucred *cred = v->a_cred;
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struct thread *td = curthread;
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|
|
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int error;
|
|
|
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MPASS(VOP_ISLOCKED(vp));
|
|
|
|
error = 0;
|
|
|
|
/* Abort if any unsettable attribute is given. */
|
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if (vap->va_type != VNON ||
|
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vap->va_nlink != VNOVAL ||
|
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vap->va_fsid != VNOVAL ||
|
|
vap->va_fileid != VNOVAL ||
|
|
vap->va_blocksize != VNOVAL ||
|
|
vap->va_gen != VNOVAL ||
|
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vap->va_rdev != VNOVAL ||
|
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vap->va_bytes != VNOVAL)
|
|
error = EINVAL;
|
|
|
|
if (error == 0 && (vap->va_flags != VNOVAL))
|
|
error = tmpfs_chflags(vp, vap->va_flags, cred, td);
|
|
|
|
if (error == 0 && (vap->va_size != VNOVAL))
|
|
error = tmpfs_chsize(vp, vap->va_size, cred, td);
|
|
|
|
if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
|
|
error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
|
|
|
|
if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
|
|
error = tmpfs_chmod(vp, vap->va_mode, cred, td);
|
|
|
|
if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
|
|
vap->va_atime.tv_nsec != VNOVAL) ||
|
|
(vap->va_mtime.tv_sec != VNOVAL &&
|
|
vap->va_mtime.tv_nsec != VNOVAL) ||
|
|
(vap->va_birthtime.tv_sec != VNOVAL &&
|
|
vap->va_birthtime.tv_nsec != VNOVAL)))
|
|
error = tmpfs_chtimes(vp, vap, cred, td);
|
|
|
|
/* Update the node times. We give preference to the error codes
|
|
* generated by this function rather than the ones that may arise
|
|
* from tmpfs_update. */
|
|
tmpfs_update(vp);
|
|
|
|
MPASS(VOP_ISLOCKED(vp));
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_read(struct vop_read_args *v)
|
|
{
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct tmpfs_node *node;
|
|
|
|
vp = v->a_vp;
|
|
if (vp->v_type != VREG)
|
|
return (EISDIR);
|
|
uio = v->a_uio;
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
node->tn_status |= TMPFS_NODE_ACCESSED;
|
|
return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
|
|
}
|
|
|
|
static int
|
|
tmpfs_write(struct vop_write_args *v)
|
|
{
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct tmpfs_node *node;
|
|
off_t oldsize;
|
|
int error, ioflag;
|
|
boolean_t extended;
|
|
|
|
vp = v->a_vp;
|
|
uio = v->a_uio;
|
|
ioflag = v->a_ioflag;
|
|
error = 0;
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
oldsize = node->tn_size;
|
|
|
|
if (uio->uio_offset < 0 || vp->v_type != VREG)
|
|
return (EINVAL);
|
|
if (uio->uio_resid == 0)
|
|
return (0);
|
|
if (ioflag & IO_APPEND)
|
|
uio->uio_offset = node->tn_size;
|
|
if (uio->uio_offset + uio->uio_resid >
|
|
VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
|
|
return (EFBIG);
|
|
if (vn_rlimit_fsize(vp, uio, uio->uio_td))
|
|
return (EFBIG);
|
|
extended = uio->uio_offset + uio->uio_resid > node->tn_size;
|
|
if (extended) {
|
|
error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
|
|
FALSE);
|
|
if (error != 0)
|
|
goto out;
|
|
}
|
|
|
|
error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
|
|
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_MODIFIED |
|
|
(extended ? TMPFS_NODE_CHANGED : 0);
|
|
if (node->tn_mode & (S_ISUID | S_ISGID)) {
|
|
if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID, 0))
|
|
node->tn_mode &= ~(S_ISUID | S_ISGID);
|
|
}
|
|
if (error != 0)
|
|
(void)tmpfs_reg_resize(vp, oldsize, TRUE);
|
|
|
|
out:
|
|
MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
|
|
MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
tmpfs_fsync(struct vop_fsync_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
MPASS(VOP_ISLOCKED(vp));
|
|
|
|
tmpfs_update(vp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tmpfs_remove(struct vop_remove_args *v)
|
|
{
|
|
struct vnode *dvp = v->a_dvp;
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
int error;
|
|
struct tmpfs_dirent *de;
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *dnode;
|
|
struct tmpfs_node *node;
|
|
|
|
MPASS(VOP_ISLOCKED(dvp));
|
|
MPASS(VOP_ISLOCKED(vp));
|
|
|
|
if (vp->v_type == VDIR) {
|
|
error = EISDIR;
|
|
goto out;
|
|
}
|
|
|
|
dnode = VP_TO_TMPFS_DIR(dvp);
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
tmp = VFS_TO_TMPFS(vp->v_mount);
|
|
de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
|
|
MPASS(de != NULL);
|
|
|
|
/* Files marked as immutable or append-only cannot be deleted. */
|
|
if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
|
|
(dnode->tn_flags & APPEND)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
/* Remove the entry from the directory; as it is a file, we do not
|
|
* have to change the number of hard links of the directory. */
|
|
tmpfs_dir_detach(dvp, de);
|
|
if (v->a_cnp->cn_flags & DOWHITEOUT)
|
|
tmpfs_dir_whiteout_add(dvp, v->a_cnp);
|
|
|
|
/* 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(tmp, de);
|
|
|
|
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
|
|
error = 0;
|
|
|
|
out:
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_link(struct vop_link_args *v)
|
|
{
|
|
struct vnode *dvp = v->a_tdvp;
|
|
struct vnode *vp = v->a_vp;
|
|
struct componentname *cnp = v->a_cnp;
|
|
|
|
int error;
|
|
struct tmpfs_dirent *de;
|
|
struct tmpfs_node *node;
|
|
|
|
MPASS(VOP_ISLOCKED(dvp));
|
|
MPASS(cnp->cn_flags & HASBUF);
|
|
MPASS(dvp != vp); /* XXX When can this be false? */
|
|
|
|
/* XXX: Why aren't the following two tests done by the caller? */
|
|
|
|
/* Hard links of directories are forbidden. */
|
|
if (vp->v_type == VDIR) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
/* Cannot create cross-device links. */
|
|
if (dvp->v_mount != vp->v_mount) {
|
|
error = EXDEV;
|
|
goto out;
|
|
}
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
/* Ensure that we do not overflow the maximum number of links imposed
|
|
* by the system. */
|
|
MPASS(node->tn_links <= LINK_MAX);
|
|
if (node->tn_links == LINK_MAX) {
|
|
error = EMLINK;
|
|
goto out;
|
|
}
|
|
|
|
/* We cannot create links of files marked immutable or append-only. */
|
|
if (node->tn_flags & (IMMUTABLE | APPEND)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate a new directory entry to represent the node. */
|
|
error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
|
|
cnp->cn_nameptr, cnp->cn_namelen, &de);
|
|
if (error != 0)
|
|
goto out;
|
|
|
|
/* Insert the new directory entry into the appropriate directory. */
|
|
if (cnp->cn_flags & ISWHITEOUT)
|
|
tmpfs_dir_whiteout_remove(dvp, cnp);
|
|
tmpfs_dir_attach(dvp, de);
|
|
|
|
/* vp link count has changed, so update node times. */
|
|
node->tn_status |= TMPFS_NODE_CHANGED;
|
|
tmpfs_update(vp);
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* We acquire all but fdvp locks using non-blocking acquisitions. If we
|
|
* fail to acquire any lock in the path we will drop all held locks,
|
|
* acquire the new lock in a blocking fashion, and then release it and
|
|
* restart the rename. This acquire/release step ensures that we do not
|
|
* spin on a lock waiting for release. On error release all vnode locks
|
|
* and decrement references the way tmpfs_rename() would do.
|
|
*/
|
|
static int
|
|
tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
|
|
struct vnode *tdvp, struct vnode **tvpp,
|
|
struct componentname *fcnp, struct componentname *tcnp)
|
|
{
|
|
struct vnode *nvp;
|
|
struct mount *mp;
|
|
struct tmpfs_dirent *de;
|
|
int error, restarts = 0;
|
|
|
|
VOP_UNLOCK(tdvp, 0);
|
|
if (*tvpp != NULL && *tvpp != tdvp)
|
|
VOP_UNLOCK(*tvpp, 0);
|
|
mp = fdvp->v_mount;
|
|
|
|
relock:
|
|
restarts += 1;
|
|
error = vn_lock(fdvp, LK_EXCLUSIVE);
|
|
if (error)
|
|
goto releout;
|
|
if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
|
|
VOP_UNLOCK(fdvp, 0);
|
|
error = vn_lock(tdvp, LK_EXCLUSIVE);
|
|
if (error)
|
|
goto releout;
|
|
VOP_UNLOCK(tdvp, 0);
|
|
goto relock;
|
|
}
|
|
/*
|
|
* Re-resolve fvp to be certain it still exists and fetch the
|
|
* correct vnode.
|
|
*/
|
|
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
|
|
if (de == NULL) {
|
|
VOP_UNLOCK(fdvp, 0);
|
|
VOP_UNLOCK(tdvp, 0);
|
|
if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
|
|
(fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
|
|
error = EINVAL;
|
|
else
|
|
error = ENOENT;
|
|
goto releout;
|
|
}
|
|
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
|
|
if (error != 0) {
|
|
VOP_UNLOCK(fdvp, 0);
|
|
VOP_UNLOCK(tdvp, 0);
|
|
if (error != EBUSY)
|
|
goto releout;
|
|
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
|
|
if (error != 0)
|
|
goto releout;
|
|
VOP_UNLOCK(nvp, 0);
|
|
/*
|
|
* Concurrent rename race.
|
|
*/
|
|
if (nvp == tdvp) {
|
|
vrele(nvp);
|
|
error = EINVAL;
|
|
goto releout;
|
|
}
|
|
vrele(*fvpp);
|
|
*fvpp = nvp;
|
|
goto relock;
|
|
}
|
|
vrele(*fvpp);
|
|
*fvpp = nvp;
|
|
VOP_UNLOCK(*fvpp, 0);
|
|
/*
|
|
* Re-resolve tvp and acquire the vnode lock if present.
|
|
*/
|
|
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
|
|
/*
|
|
* If tvp disappeared we just carry on.
|
|
*/
|
|
if (de == NULL && *tvpp != NULL) {
|
|
vrele(*tvpp);
|
|
*tvpp = NULL;
|
|
}
|
|
/*
|
|
* Get the tvp ino if the lookup succeeded. We may have to restart
|
|
* if the non-blocking acquire fails.
|
|
*/
|
|
if (de != NULL) {
|
|
nvp = NULL;
|
|
error = tmpfs_alloc_vp(mp, de->td_node,
|
|
LK_EXCLUSIVE | LK_NOWAIT, &nvp);
|
|
if (*tvpp != NULL)
|
|
vrele(*tvpp);
|
|
*tvpp = nvp;
|
|
if (error != 0) {
|
|
VOP_UNLOCK(fdvp, 0);
|
|
VOP_UNLOCK(tdvp, 0);
|
|
if (error != EBUSY)
|
|
goto releout;
|
|
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
|
|
&nvp);
|
|
if (error != 0)
|
|
goto releout;
|
|
VOP_UNLOCK(nvp, 0);
|
|
/*
|
|
* fdvp contains fvp, thus tvp (=fdvp) is not empty.
|
|
*/
|
|
if (nvp == fdvp) {
|
|
error = ENOTEMPTY;
|
|
goto releout;
|
|
}
|
|
goto relock;
|
|
}
|
|
}
|
|
tmpfs_rename_restarts += restarts;
|
|
|
|
return (0);
|
|
|
|
releout:
|
|
vrele(fdvp);
|
|
vrele(*fvpp);
|
|
vrele(tdvp);
|
|
if (*tvpp != NULL)
|
|
vrele(*tvpp);
|
|
tmpfs_rename_restarts += restarts;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
tmpfs_rename(struct vop_rename_args *v)
|
|
{
|
|
struct vnode *fdvp = v->a_fdvp;
|
|
struct vnode *fvp = v->a_fvp;
|
|
struct componentname *fcnp = v->a_fcnp;
|
|
struct vnode *tdvp = v->a_tdvp;
|
|
struct vnode *tvp = v->a_tvp;
|
|
struct componentname *tcnp = v->a_tcnp;
|
|
struct mount *mp = NULL;
|
|
|
|
char *newname;
|
|
int error;
|
|
struct tmpfs_dirent *de;
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *fdnode;
|
|
struct tmpfs_node *fnode;
|
|
struct tmpfs_node *tnode;
|
|
struct tmpfs_node *tdnode;
|
|
|
|
MPASS(VOP_ISLOCKED(tdvp));
|
|
MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
|
|
MPASS(fcnp->cn_flags & HASBUF);
|
|
MPASS(tcnp->cn_flags & HASBUF);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* If source and target are the same file, there is nothing to do. */
|
|
if (fvp == tvp) {
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* If we need to move the directory between entries, lock the
|
|
* source so that we can safely operate on it. */
|
|
if (fdvp != tdvp && fdvp != tvp) {
|
|
if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
|
|
mp = tdvp->v_mount;
|
|
error = vfs_busy(mp, 0);
|
|
if (error != 0) {
|
|
mp = NULL;
|
|
goto out;
|
|
}
|
|
error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
|
|
fcnp, tcnp);
|
|
if (error != 0) {
|
|
vfs_unbusy(mp);
|
|
return (error);
|
|
}
|
|
ASSERT_VOP_ELOCKED(fdvp,
|
|
"tmpfs_rename: fdvp not locked");
|
|
ASSERT_VOP_ELOCKED(tdvp,
|
|
"tmpfs_rename: tdvp not locked");
|
|
if (tvp != NULL)
|
|
ASSERT_VOP_ELOCKED(tvp,
|
|
"tmpfs_rename: tvp not locked");
|
|
if (fvp == tvp) {
|
|
error = 0;
|
|
goto out_locked;
|
|
}
|
|
}
|
|
}
|
|
|
|
tmp = VFS_TO_TMPFS(tdvp->v_mount);
|
|
tdnode = VP_TO_TMPFS_DIR(tdvp);
|
|
tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
|
|
fdnode = VP_TO_TMPFS_DIR(fdvp);
|
|
fnode = VP_TO_TMPFS_NODE(fvp);
|
|
de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
|
|
|
|
/* Entry can disappear before we lock fdvp,
|
|
* also avoid manipulating '.' and '..' entries. */
|
|
if (de == NULL) {
|
|
if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
|
|
(fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
|
|
error = EINVAL;
|
|
else
|
|
error = ENOENT;
|
|
goto out_locked;
|
|
}
|
|
MPASS(de->td_node == fnode);
|
|
|
|
/* If re-naming a directory to another preexisting directory
|
|
* ensure that the target directory is empty so that its
|
|
* removal causes no side effects.
|
|
* Kern_rename gurantees the destination to be a directory
|
|
* if the source is one. */
|
|
if (tvp != NULL) {
|
|
MPASS(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 {
|
|
MPASS(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 (fcnp->cn_namelen != tcnp->cn_namelen ||
|
|
bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
|
|
newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
|
|
} else
|
|
newname = NULL;
|
|
|
|
/* If the node is being moved to another directory, we have to do
|
|
* the move. */
|
|
if (fdnode != tdnode) {
|
|
/* In case we are moving a directory, we have to adjust its
|
|
* parent to point to the new parent. */
|
|
if (de->td_node->tn_type == VDIR) {
|
|
struct tmpfs_node *n;
|
|
|
|
/* Ensure the target directory is not a child of the
|
|
* directory being moved. Otherwise, we'd end up
|
|
* with stale nodes. */
|
|
n = tdnode;
|
|
/* TMPFS_LOCK garanties that no nodes are freed while
|
|
* traversing the list. Nodes can only be marked as
|
|
* removed: tn_parent == NULL. */
|
|
TMPFS_LOCK(tmp);
|
|
TMPFS_NODE_LOCK(n);
|
|
while (n != n->tn_dir.tn_parent) {
|
|
struct tmpfs_node *parent;
|
|
|
|
if (n == fnode) {
|
|
TMPFS_NODE_UNLOCK(n);
|
|
TMPFS_UNLOCK(tmp);
|
|
error = EINVAL;
|
|
if (newname != NULL)
|
|
free(newname, M_TMPFSNAME);
|
|
goto out_locked;
|
|
}
|
|
parent = n->tn_dir.tn_parent;
|
|
TMPFS_NODE_UNLOCK(n);
|
|
if (parent == NULL) {
|
|
n = NULL;
|
|
break;
|
|
}
|
|
TMPFS_NODE_LOCK(parent);
|
|
if (parent->tn_dir.tn_parent == NULL) {
|
|
TMPFS_NODE_UNLOCK(parent);
|
|
n = NULL;
|
|
break;
|
|
}
|
|
n = parent;
|
|
}
|
|
TMPFS_UNLOCK(tmp);
|
|
if (n == NULL) {
|
|
error = EINVAL;
|
|
if (newname != NULL)
|
|
free(newname, M_TMPFSNAME);
|
|
goto out_locked;
|
|
}
|
|
TMPFS_NODE_UNLOCK(n);
|
|
|
|
/* Adjust the parent pointer. */
|
|
TMPFS_VALIDATE_DIR(fnode);
|
|
TMPFS_NODE_LOCK(de->td_node);
|
|
de->td_node->tn_dir.tn_parent = tdnode;
|
|
TMPFS_NODE_UNLOCK(de->td_node);
|
|
|
|
/* As a result of changing the target of the '..'
|
|
* entry, the link count of the source and target
|
|
* directories has to be adjusted. */
|
|
TMPFS_NODE_LOCK(tdnode);
|
|
TMPFS_ASSERT_LOCKED(tdnode);
|
|
tdnode->tn_links++;
|
|
TMPFS_NODE_UNLOCK(tdnode);
|
|
|
|
TMPFS_NODE_LOCK(fdnode);
|
|
TMPFS_ASSERT_LOCKED(fdnode);
|
|
fdnode->tn_links--;
|
|
TMPFS_NODE_UNLOCK(fdnode);
|
|
}
|
|
}
|
|
|
|
/* Do the move: just remove the entry from the source directory
|
|
* and insert it into the target one. */
|
|
tmpfs_dir_detach(fdvp, de);
|
|
|
|
if (fcnp->cn_flags & DOWHITEOUT)
|
|
tmpfs_dir_whiteout_add(fdvp, fcnp);
|
|
if (tcnp->cn_flags & ISWHITEOUT)
|
|
tmpfs_dir_whiteout_remove(tdvp, tcnp);
|
|
|
|
/* If the name has changed, we need to make it effective by changing
|
|
* it in the directory entry. */
|
|
if (newname != NULL) {
|
|
MPASS(tcnp->cn_namelen <= MAXNAMLEN);
|
|
|
|
free(de->ud.td_name, M_TMPFSNAME);
|
|
de->ud.td_name = newname;
|
|
tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
|
|
|
|
fnode->tn_status |= TMPFS_NODE_CHANGED;
|
|
tdnode->tn_status |= TMPFS_NODE_MODIFIED;
|
|
}
|
|
|
|
/* If we are overwriting an entry, we have to remove the old one
|
|
* from the target directory. */
|
|
if (tvp != NULL) {
|
|
struct tmpfs_dirent *tde;
|
|
|
|
/* Remove the old entry from the target directory. */
|
|
tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
|
|
tmpfs_dir_detach(tdvp, tde);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
tmpfs_dir_attach(tdvp, de);
|
|
|
|
cache_purge(fvp);
|
|
if (tvp != NULL)
|
|
cache_purge(tvp);
|
|
cache_purge_negative(tdvp);
|
|
|
|
error = 0;
|
|
|
|
out_locked:
|
|
if (fdvp != tdvp && fdvp != tvp)
|
|
VOP_UNLOCK(fdvp, 0);
|
|
|
|
out:
|
|
/* Release target nodes. */
|
|
/* XXX: I don't understand when tdvp can be the same as tvp, but
|
|
* other code takes care of this... */
|
|
if (tdvp == tvp)
|
|
vrele(tdvp);
|
|
else
|
|
vput(tdvp);
|
|
if (tvp != NULL)
|
|
vput(tvp);
|
|
|
|
/* Release source nodes. */
|
|
vrele(fdvp);
|
|
vrele(fvp);
|
|
|
|
if (mp != NULL)
|
|
vfs_unbusy(mp);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_mkdir(struct vop_mkdir_args *v)
|
|
{
|
|
struct vnode *dvp = v->a_dvp;
|
|
struct vnode **vpp = v->a_vpp;
|
|
struct componentname *cnp = v->a_cnp;
|
|
struct vattr *vap = v->a_vap;
|
|
|
|
MPASS(vap->va_type == VDIR);
|
|
|
|
return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
|
|
}
|
|
|
|
static int
|
|
tmpfs_rmdir(struct vop_rmdir_args *v)
|
|
{
|
|
struct vnode *dvp = v->a_dvp;
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
int error;
|
|
struct tmpfs_dirent *de;
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *dnode;
|
|
struct tmpfs_node *node;
|
|
|
|
MPASS(VOP_ISLOCKED(dvp));
|
|
MPASS(VOP_ISLOCKED(vp));
|
|
|
|
tmp = VFS_TO_TMPFS(dvp->v_mount);
|
|
dnode = VP_TO_TMPFS_DIR(dvp);
|
|
node = VP_TO_TMPFS_DIR(vp);
|
|
|
|
/* Directories with more than two entries ('.' and '..') cannot be
|
|
* removed. */
|
|
if (node->tn_size > 0) {
|
|
error = ENOTEMPTY;
|
|
goto out;
|
|
}
|
|
|
|
if ((dnode->tn_flags & APPEND)
|
|
|| (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
/* This invariant holds only if we are not trying to remove "..".
|
|
* We checked for that above so this is safe now. */
|
|
MPASS(node->tn_dir.tn_parent == dnode);
|
|
|
|
/* Get the directory entry associated with node (vp). This was
|
|
* filled by tmpfs_lookup while looking up the entry. */
|
|
de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
|
|
MPASS(TMPFS_DIRENT_MATCHES(de,
|
|
v->a_cnp->cn_nameptr,
|
|
v->a_cnp->cn_namelen));
|
|
|
|
/* Check flags to see if we are allowed to remove the directory. */
|
|
if (dnode->tn_flags & APPEND
|
|
|| node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
|
|
|
|
/* Detach the directory entry from the directory (dnode). */
|
|
tmpfs_dir_detach(dvp, de);
|
|
if (v->a_cnp->cn_flags & DOWHITEOUT)
|
|
tmpfs_dir_whiteout_add(dvp, v->a_cnp);
|
|
|
|
/* No vnode should be allocated for this entry from this point */
|
|
TMPFS_NODE_LOCK(node);
|
|
TMPFS_ASSERT_ELOCKED(node);
|
|
node->tn_links--;
|
|
node->tn_dir.tn_parent = NULL;
|
|
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
|
|
TMPFS_NODE_MODIFIED;
|
|
|
|
TMPFS_NODE_UNLOCK(node);
|
|
|
|
TMPFS_NODE_LOCK(dnode);
|
|
TMPFS_ASSERT_ELOCKED(dnode);
|
|
dnode->tn_links--;
|
|
dnode->tn_status |= TMPFS_NODE_ACCESSED | \
|
|
TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
|
|
TMPFS_NODE_UNLOCK(dnode);
|
|
|
|
cache_purge(dvp);
|
|
cache_purge(vp);
|
|
|
|
/* 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(tmp, de);
|
|
|
|
/* Release the deleted vnode (will destroy the node, notify
|
|
* interested parties and clean it from the cache). */
|
|
|
|
dnode->tn_status |= TMPFS_NODE_CHANGED;
|
|
tmpfs_update(dvp);
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_symlink(struct vop_symlink_args *v)
|
|
{
|
|
struct vnode *dvp = v->a_dvp;
|
|
struct vnode **vpp = v->a_vpp;
|
|
struct componentname *cnp = v->a_cnp;
|
|
struct vattr *vap = v->a_vap;
|
|
char *target = v->a_target;
|
|
|
|
#ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
|
|
MPASS(vap->va_type == VLNK);
|
|
#else
|
|
vap->va_type = VLNK;
|
|
#endif
|
|
|
|
return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
|
|
}
|
|
|
|
static int
|
|
tmpfs_readdir(struct vop_readdir_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
struct uio *uio = v->a_uio;
|
|
int *eofflag = v->a_eofflag;
|
|
u_long **cookies = v->a_cookies;
|
|
int *ncookies = v->a_ncookies;
|
|
|
|
int error;
|
|
ssize_t startresid;
|
|
int maxcookies;
|
|
struct tmpfs_node *node;
|
|
|
|
/* This operation only makes sense on directory nodes. */
|
|
if (vp->v_type != VDIR)
|
|
return ENOTDIR;
|
|
|
|
maxcookies = 0;
|
|
node = VP_TO_TMPFS_DIR(vp);
|
|
|
|
startresid = uio->uio_resid;
|
|
|
|
/* Allocate cookies for NFS and compat modules. */
|
|
if (cookies != NULL && ncookies != NULL) {
|
|
maxcookies = howmany(node->tn_size,
|
|
sizeof(struct tmpfs_dirent)) + 2;
|
|
*cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
|
|
M_WAITOK);
|
|
*ncookies = 0;
|
|
}
|
|
|
|
if (cookies == NULL)
|
|
error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
|
|
else
|
|
error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
|
|
ncookies);
|
|
|
|
/* Buffer was filled without hitting EOF. */
|
|
if (error == EJUSTRETURN)
|
|
error = (uio->uio_resid != startresid) ? 0 : EINVAL;
|
|
|
|
if (error != 0 && cookies != NULL)
|
|
free(*cookies, M_TEMP);
|
|
|
|
if (eofflag != NULL)
|
|
*eofflag =
|
|
(error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_readlink(struct vop_readlink_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
struct uio *uio = v->a_uio;
|
|
|
|
int error;
|
|
struct tmpfs_node *node;
|
|
|
|
MPASS(uio->uio_offset == 0);
|
|
MPASS(vp->v_type == VLNK);
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
error = uiomove(node->tn_link, MIN(node->tn_size, uio->uio_resid),
|
|
uio);
|
|
node->tn_status |= TMPFS_NODE_ACCESSED;
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_inactive(struct vop_inactive_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
if (node->tn_links == 0)
|
|
vrecycle(vp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tmpfs_reclaim(struct vop_reclaim_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
struct tmpfs_mount *tmp;
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
tmp = VFS_TO_TMPFS(vp->v_mount);
|
|
|
|
if (vp->v_type == VREG)
|
|
tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
|
|
else
|
|
vnode_destroy_vobject(vp);
|
|
vp->v_object = NULL;
|
|
cache_purge(vp);
|
|
|
|
TMPFS_NODE_LOCK(node);
|
|
TMPFS_ASSERT_ELOCKED(node);
|
|
tmpfs_free_vp(vp);
|
|
|
|
/* If the node referenced by this vnode was deleted by the user,
|
|
* we must free its associated data structures (now that the vnode
|
|
* is being reclaimed). */
|
|
if (node->tn_links == 0 &&
|
|
(node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
|
|
node->tn_vpstate = TMPFS_VNODE_DOOMED;
|
|
TMPFS_NODE_UNLOCK(node);
|
|
tmpfs_free_node(tmp, node);
|
|
} else
|
|
TMPFS_NODE_UNLOCK(node);
|
|
|
|
MPASS(vp->v_data == NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tmpfs_print(struct vop_print_args *v)
|
|
{
|
|
struct vnode *vp = v->a_vp;
|
|
|
|
struct tmpfs_node *node;
|
|
|
|
node = VP_TO_TMPFS_NODE(vp);
|
|
|
|
printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %d\n",
|
|
node, node->tn_flags, node->tn_links);
|
|
printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
|
|
node->tn_mode, node->tn_uid, node->tn_gid,
|
|
(intmax_t)node->tn_size, node->tn_status);
|
|
|
|
if (vp->v_type == VFIFO)
|
|
fifo_printinfo(vp);
|
|
|
|
printf("\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
tmpfs_pathconf(struct vop_pathconf_args *v)
|
|
{
|
|
int name = v->a_name;
|
|
register_t *retval = v->a_retval;
|
|
|
|
int error;
|
|
|
|
error = 0;
|
|
|
|
switch (name) {
|
|
case _PC_LINK_MAX:
|
|
*retval = LINK_MAX;
|
|
break;
|
|
|
|
case _PC_NAME_MAX:
|
|
*retval = NAME_MAX;
|
|
break;
|
|
|
|
case _PC_PATH_MAX:
|
|
*retval = PATH_MAX;
|
|
break;
|
|
|
|
case _PC_PIPE_BUF:
|
|
*retval = PIPE_BUF;
|
|
break;
|
|
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*retval = 1;
|
|
break;
|
|
|
|
case _PC_NO_TRUNC:
|
|
*retval = 1;
|
|
break;
|
|
|
|
case _PC_SYNC_IO:
|
|
*retval = 1;
|
|
break;
|
|
|
|
case _PC_FILESIZEBITS:
|
|
*retval = 0; /* XXX Don't know which value should I return. */
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
tmpfs_vptofh(struct vop_vptofh_args *ap)
|
|
{
|
|
struct tmpfs_fid *tfhp;
|
|
struct tmpfs_node *node;
|
|
|
|
tfhp = (struct tmpfs_fid *)ap->a_fhp;
|
|
node = VP_TO_TMPFS_NODE(ap->a_vp);
|
|
|
|
tfhp->tf_len = sizeof(struct tmpfs_fid);
|
|
tfhp->tf_id = node->tn_id;
|
|
tfhp->tf_gen = node->tn_gen;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tmpfs_whiteout(struct vop_whiteout_args *ap)
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct tmpfs_dirent *de;
|
|
|
|
switch (ap->a_flags) {
|
|
case LOOKUP:
|
|
return (0);
|
|
case CREATE:
|
|
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
|
|
if (de != NULL)
|
|
return (de->td_node == NULL ? 0 : EEXIST);
|
|
return (tmpfs_dir_whiteout_add(dvp, cnp));
|
|
case DELETE:
|
|
tmpfs_dir_whiteout_remove(dvp, cnp);
|
|
return (0);
|
|
default:
|
|
panic("tmpfs_whiteout: unknown op");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vnode operations vector used for files stored in a tmpfs file system.
|
|
*/
|
|
struct vop_vector tmpfs_vnodeop_entries = {
|
|
.vop_default = &default_vnodeops,
|
|
.vop_lookup = vfs_cache_lookup,
|
|
.vop_cachedlookup = tmpfs_lookup,
|
|
.vop_create = tmpfs_create,
|
|
.vop_mknod = tmpfs_mknod,
|
|
.vop_open = tmpfs_open,
|
|
.vop_close = tmpfs_close,
|
|
.vop_access = tmpfs_access,
|
|
.vop_getattr = tmpfs_getattr,
|
|
.vop_setattr = tmpfs_setattr,
|
|
.vop_read = tmpfs_read,
|
|
.vop_write = tmpfs_write,
|
|
.vop_fsync = tmpfs_fsync,
|
|
.vop_remove = tmpfs_remove,
|
|
.vop_link = tmpfs_link,
|
|
.vop_rename = tmpfs_rename,
|
|
.vop_mkdir = tmpfs_mkdir,
|
|
.vop_rmdir = tmpfs_rmdir,
|
|
.vop_symlink = tmpfs_symlink,
|
|
.vop_readdir = tmpfs_readdir,
|
|
.vop_readlink = tmpfs_readlink,
|
|
.vop_inactive = tmpfs_inactive,
|
|
.vop_reclaim = tmpfs_reclaim,
|
|
.vop_print = tmpfs_print,
|
|
.vop_pathconf = tmpfs_pathconf,
|
|
.vop_vptofh = tmpfs_vptofh,
|
|
.vop_whiteout = tmpfs_whiteout,
|
|
.vop_bmap = VOP_EOPNOTSUPP,
|
|
};
|
|
|