78022527bb
kern_execve() locks text vnode exclusive to be able to set and clear VV_TEXT flag. VV_TEXT is mutually exclusive with the v_writecount > 0 condition. The change removes VV_TEXT, replacing it with the condition v_writecount <= -1, and puts v_writecount under the vnode interlock. Each text reference decrements v_writecount. To clear the text reference when the segment is unmapped, it is recorded in the vm_map_entry backed by the text file as MAP_ENTRY_VN_TEXT flag, and v_writecount is incremented on the map entry removal The operations like VOP_ADD_WRITECOUNT() and VOP_SET_TEXT() check that v_writecount does not contradict the desired change. vn_writecheck() is now racy and its use was eliminated everywhere except access. Atomic check for writeability and increment of v_writecount is performed by the VOP. vn_truncate() now increments v_writecount around VOP_SETATTR() call, lack of which is arguably a bug on its own. nullfs bypasses v_writecount to the lower vnode always, so nullfs vnode has its own v_writecount correct, and lower vnode gets all references, since object->handle is always lower vnode. On the text vnode' vm object dealloc, the v_writecount value is reset to zero, and deadfs vop_unset_text short-circuit the operation. Reclamation of lowervp always reclaims all nullfs vnodes referencing lowervp first, so no stray references are left. Reviewed by: markj, trasz Tested by: mjg, pho Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D19923
1272 lines
29 KiB
C
1272 lines
29 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1994 Jan-Simon Pendry
|
|
* Copyright (c) 1994
|
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* The Regents of the University of California. All rights reserved.
|
|
* Copyright (c) 2005, 2006, 2012 Masanori Ozawa <ozawa@ongs.co.jp>, ONGS Inc.
|
|
* Copyright (c) 2006, 2012 Daichi Goto <daichi@freebsd.org>
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Jan-Simon Pendry.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)union_subr.c 8.20 (Berkeley) 5/20/95
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/dirent.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/filedesc.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/resourcevar.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
#include <vm/uma.h>
|
|
|
|
#include <fs/unionfs/union.h>
|
|
|
|
#define NUNIONFSNODECACHE 16
|
|
|
|
static MALLOC_DEFINE(M_UNIONFSHASH, "UNIONFS hash", "UNIONFS hash table");
|
|
MALLOC_DEFINE(M_UNIONFSNODE, "UNIONFS node", "UNIONFS vnode private part");
|
|
MALLOC_DEFINE(M_UNIONFSPATH, "UNIONFS path", "UNIONFS path private part");
|
|
|
|
/*
|
|
* Initialize
|
|
*/
|
|
int
|
|
unionfs_init(struct vfsconf *vfsp)
|
|
{
|
|
UNIONFSDEBUG("unionfs_init\n"); /* printed during system boot */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Uninitialize
|
|
*/
|
|
int
|
|
unionfs_uninit(struct vfsconf *vfsp)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
static struct unionfs_node_hashhead *
|
|
unionfs_get_hashhead(struct vnode *dvp, char *path)
|
|
{
|
|
int count;
|
|
char hash;
|
|
struct unionfs_node *unp;
|
|
|
|
hash = 0;
|
|
unp = VTOUNIONFS(dvp);
|
|
if (path != NULL) {
|
|
for (count = 0; path[count]; count++)
|
|
hash += path[count];
|
|
}
|
|
|
|
return (&(unp->un_hashtbl[hash & (unp->un_hashmask)]));
|
|
}
|
|
|
|
/*
|
|
* Get the cached vnode.
|
|
*/
|
|
static struct vnode *
|
|
unionfs_get_cached_vnode(struct vnode *uvp, struct vnode *lvp,
|
|
struct vnode *dvp, char *path)
|
|
{
|
|
struct unionfs_node_hashhead *hd;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
|
|
KASSERT((uvp == NULLVP || uvp->v_type == VDIR),
|
|
("unionfs_get_cached_vnode: v_type != VDIR"));
|
|
KASSERT((lvp == NULLVP || lvp->v_type == VDIR),
|
|
("unionfs_get_cached_vnode: v_type != VDIR"));
|
|
|
|
VI_LOCK(dvp);
|
|
hd = unionfs_get_hashhead(dvp, path);
|
|
LIST_FOREACH(unp, hd, un_hash) {
|
|
if (!strcmp(unp->un_path, path)) {
|
|
vp = UNIONFSTOV(unp);
|
|
VI_LOCK_FLAGS(vp, MTX_DUPOK);
|
|
VI_UNLOCK(dvp);
|
|
vp->v_iflag &= ~VI_OWEINACT;
|
|
if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
|
|
VI_UNLOCK(vp);
|
|
vp = NULLVP;
|
|
} else
|
|
VI_UNLOCK(vp);
|
|
return (vp);
|
|
}
|
|
}
|
|
VI_UNLOCK(dvp);
|
|
|
|
return (NULLVP);
|
|
}
|
|
|
|
/*
|
|
* Add the new vnode into cache.
|
|
*/
|
|
static struct vnode *
|
|
unionfs_ins_cached_vnode(struct unionfs_node *uncp,
|
|
struct vnode *dvp, char *path)
|
|
{
|
|
struct unionfs_node_hashhead *hd;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
|
|
KASSERT((uncp->un_uppervp==NULLVP || uncp->un_uppervp->v_type==VDIR),
|
|
("unionfs_ins_cached_vnode: v_type != VDIR"));
|
|
KASSERT((uncp->un_lowervp==NULLVP || uncp->un_lowervp->v_type==VDIR),
|
|
("unionfs_ins_cached_vnode: v_type != VDIR"));
|
|
|
|
VI_LOCK(dvp);
|
|
hd = unionfs_get_hashhead(dvp, path);
|
|
LIST_FOREACH(unp, hd, un_hash) {
|
|
if (!strcmp(unp->un_path, path)) {
|
|
vp = UNIONFSTOV(unp);
|
|
VI_LOCK_FLAGS(vp, MTX_DUPOK);
|
|
vp->v_iflag &= ~VI_OWEINACT;
|
|
if ((vp->v_iflag & (VI_DOOMED | VI_DOINGINACT)) != 0) {
|
|
LIST_INSERT_HEAD(hd, uncp, un_hash);
|
|
VI_UNLOCK(vp);
|
|
vp = NULLVP;
|
|
} else
|
|
VI_UNLOCK(vp);
|
|
VI_UNLOCK(dvp);
|
|
return (vp);
|
|
}
|
|
}
|
|
|
|
LIST_INSERT_HEAD(hd, uncp, un_hash);
|
|
VI_UNLOCK(dvp);
|
|
|
|
return (NULLVP);
|
|
}
|
|
|
|
/*
|
|
* Remove the vnode.
|
|
*/
|
|
static void
|
|
unionfs_rem_cached_vnode(struct unionfs_node *unp, struct vnode *dvp)
|
|
{
|
|
KASSERT((unp != NULL), ("unionfs_rem_cached_vnode: null node"));
|
|
KASSERT((dvp != NULLVP),
|
|
("unionfs_rem_cached_vnode: null parent vnode"));
|
|
KASSERT((unp->un_hash.le_prev != NULL),
|
|
("unionfs_rem_cached_vnode: null hash"));
|
|
|
|
VI_LOCK(dvp);
|
|
LIST_REMOVE(unp, un_hash);
|
|
unp->un_hash.le_next = NULL;
|
|
unp->un_hash.le_prev = NULL;
|
|
VI_UNLOCK(dvp);
|
|
}
|
|
|
|
/*
|
|
* Make a new or get existing unionfs node.
|
|
*
|
|
* uppervp and lowervp should be unlocked. Because if new unionfs vnode is
|
|
* locked, uppervp or lowervp is locked too. In order to prevent dead lock,
|
|
* you should not lock plurality simultaneously.
|
|
*/
|
|
int
|
|
unionfs_nodeget(struct mount *mp, struct vnode *uppervp,
|
|
struct vnode *lowervp, struct vnode *dvp,
|
|
struct vnode **vpp, struct componentname *cnp,
|
|
struct thread *td)
|
|
{
|
|
struct unionfs_mount *ump;
|
|
struct unionfs_node *unp;
|
|
struct vnode *vp;
|
|
int error;
|
|
int lkflags;
|
|
enum vtype vt;
|
|
char *path;
|
|
|
|
ump = MOUNTTOUNIONFSMOUNT(mp);
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|
lkflags = (cnp ? cnp->cn_lkflags : 0);
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|
path = (cnp ? cnp->cn_nameptr : NULL);
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|
*vpp = NULLVP;
|
|
|
|
if (uppervp == NULLVP && lowervp == NULLVP)
|
|
panic("unionfs_nodeget: upper and lower is null");
|
|
|
|
vt = (uppervp != NULLVP ? uppervp->v_type : lowervp->v_type);
|
|
|
|
/* If it has no ISLASTCN flag, path check is skipped. */
|
|
if (cnp && !(cnp->cn_flags & ISLASTCN))
|
|
path = NULL;
|
|
|
|
/* check the cache */
|
|
if (path != NULL && dvp != NULLVP && vt == VDIR) {
|
|
vp = unionfs_get_cached_vnode(uppervp, lowervp, dvp, path);
|
|
if (vp != NULLVP) {
|
|
vref(vp);
|
|
*vpp = vp;
|
|
goto unionfs_nodeget_out;
|
|
}
|
|
}
|
|
|
|
if ((uppervp == NULLVP || ump->um_uppervp != uppervp) ||
|
|
(lowervp == NULLVP || ump->um_lowervp != lowervp)) {
|
|
/* dvp will be NULLVP only in case of root vnode. */
|
|
if (dvp == NULLVP)
|
|
return (EINVAL);
|
|
}
|
|
unp = malloc(sizeof(struct unionfs_node),
|
|
M_UNIONFSNODE, M_WAITOK | M_ZERO);
|
|
|
|
error = getnewvnode("unionfs", mp, &unionfs_vnodeops, &vp);
|
|
if (error != 0) {
|
|
free(unp, M_UNIONFSNODE);
|
|
return (error);
|
|
}
|
|
error = insmntque(vp, mp); /* XXX: Too early for mpsafe fs */
|
|
if (error != 0) {
|
|
free(unp, M_UNIONFSNODE);
|
|
return (error);
|
|
}
|
|
if (dvp != NULLVP)
|
|
vref(dvp);
|
|
if (uppervp != NULLVP)
|
|
vref(uppervp);
|
|
if (lowervp != NULLVP)
|
|
vref(lowervp);
|
|
|
|
if (vt == VDIR)
|
|
unp->un_hashtbl = hashinit(NUNIONFSNODECACHE, M_UNIONFSHASH,
|
|
&(unp->un_hashmask));
|
|
|
|
unp->un_vnode = vp;
|
|
unp->un_uppervp = uppervp;
|
|
unp->un_lowervp = lowervp;
|
|
unp->un_dvp = dvp;
|
|
if (uppervp != NULLVP)
|
|
vp->v_vnlock = uppervp->v_vnlock;
|
|
else
|
|
vp->v_vnlock = lowervp->v_vnlock;
|
|
|
|
if (path != NULL) {
|
|
unp->un_path = (char *)
|
|
malloc(cnp->cn_namelen +1, M_UNIONFSPATH, M_WAITOK|M_ZERO);
|
|
bcopy(cnp->cn_nameptr, unp->un_path, cnp->cn_namelen);
|
|
unp->un_path[cnp->cn_namelen] = '\0';
|
|
}
|
|
vp->v_type = vt;
|
|
vp->v_data = unp;
|
|
|
|
if ((uppervp != NULLVP && ump->um_uppervp == uppervp) &&
|
|
(lowervp != NULLVP && ump->um_lowervp == lowervp))
|
|
vp->v_vflag |= VV_ROOT;
|
|
|
|
if (path != NULL && dvp != NULLVP && vt == VDIR)
|
|
*vpp = unionfs_ins_cached_vnode(unp, dvp, path);
|
|
if ((*vpp) != NULLVP) {
|
|
if (dvp != NULLVP)
|
|
vrele(dvp);
|
|
if (uppervp != NULLVP)
|
|
vrele(uppervp);
|
|
if (lowervp != NULLVP)
|
|
vrele(lowervp);
|
|
|
|
unp->un_uppervp = NULLVP;
|
|
unp->un_lowervp = NULLVP;
|
|
unp->un_dvp = NULLVP;
|
|
vrele(vp);
|
|
vp = *vpp;
|
|
vref(vp);
|
|
} else
|
|
*vpp = vp;
|
|
|
|
unionfs_nodeget_out:
|
|
if (lkflags & LK_TYPE_MASK)
|
|
vn_lock(vp, lkflags | LK_RETRY);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Clean up the unionfs node.
|
|
*/
|
|
void
|
|
unionfs_noderem(struct vnode *vp, struct thread *td)
|
|
{
|
|
int count;
|
|
struct unionfs_node *unp, *unp_t1, *unp_t2;
|
|
struct unionfs_node_hashhead *hd;
|
|
struct unionfs_node_status *unsp, *unsp_tmp;
|
|
struct vnode *lvp;
|
|
struct vnode *uvp;
|
|
struct vnode *dvp;
|
|
|
|
/*
|
|
* Use the interlock to protect the clearing of v_data to
|
|
* prevent faults in unionfs_lock().
|
|
*/
|
|
VI_LOCK(vp);
|
|
unp = VTOUNIONFS(vp);
|
|
lvp = unp->un_lowervp;
|
|
uvp = unp->un_uppervp;
|
|
dvp = unp->un_dvp;
|
|
unp->un_lowervp = unp->un_uppervp = NULLVP;
|
|
vp->v_vnlock = &(vp->v_lock);
|
|
vp->v_data = NULL;
|
|
vp->v_object = NULL;
|
|
VI_UNLOCK(vp);
|
|
|
|
if (lvp != NULLVP)
|
|
VOP_UNLOCK(lvp, LK_RELEASE);
|
|
if (uvp != NULLVP)
|
|
VOP_UNLOCK(uvp, LK_RELEASE);
|
|
|
|
if (dvp != NULLVP && unp->un_hash.le_prev != NULL)
|
|
unionfs_rem_cached_vnode(unp, dvp);
|
|
|
|
if (lockmgr(vp->v_vnlock, LK_EXCLUSIVE, VI_MTX(vp)) != 0)
|
|
panic("the lock for deletion is unacquirable.");
|
|
|
|
if (lvp != NULLVP)
|
|
vrele(lvp);
|
|
if (uvp != NULLVP)
|
|
vrele(uvp);
|
|
if (dvp != NULLVP) {
|
|
vrele(dvp);
|
|
unp->un_dvp = NULLVP;
|
|
}
|
|
if (unp->un_path != NULL) {
|
|
free(unp->un_path, M_UNIONFSPATH);
|
|
unp->un_path = NULL;
|
|
}
|
|
|
|
if (unp->un_hashtbl != NULL) {
|
|
for (count = 0; count <= unp->un_hashmask; count++) {
|
|
hd = unp->un_hashtbl + count;
|
|
LIST_FOREACH_SAFE(unp_t1, hd, un_hash, unp_t2) {
|
|
LIST_REMOVE(unp_t1, un_hash);
|
|
unp_t1->un_hash.le_next = NULL;
|
|
unp_t1->un_hash.le_prev = NULL;
|
|
}
|
|
}
|
|
hashdestroy(unp->un_hashtbl, M_UNIONFSHASH, unp->un_hashmask);
|
|
}
|
|
|
|
LIST_FOREACH_SAFE(unsp, &(unp->un_unshead), uns_list, unsp_tmp) {
|
|
LIST_REMOVE(unsp, uns_list);
|
|
free(unsp, M_TEMP);
|
|
}
|
|
free(unp, M_UNIONFSNODE);
|
|
}
|
|
|
|
/*
|
|
* Get the unionfs node status.
|
|
* You need exclusive lock this vnode.
|
|
*/
|
|
void
|
|
unionfs_get_node_status(struct unionfs_node *unp, struct thread *td,
|
|
struct unionfs_node_status **unspp)
|
|
{
|
|
struct unionfs_node_status *unsp;
|
|
pid_t pid = td->td_proc->p_pid;
|
|
|
|
KASSERT(NULL != unspp, ("null pointer"));
|
|
ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
|
|
|
|
LIST_FOREACH(unsp, &(unp->un_unshead), uns_list) {
|
|
if (unsp->uns_pid == pid) {
|
|
*unspp = unsp;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* create a new unionfs node status */
|
|
unsp = malloc(sizeof(struct unionfs_node_status),
|
|
M_TEMP, M_WAITOK | M_ZERO);
|
|
|
|
unsp->uns_pid = pid;
|
|
LIST_INSERT_HEAD(&(unp->un_unshead), unsp, uns_list);
|
|
|
|
*unspp = unsp;
|
|
}
|
|
|
|
/*
|
|
* Remove the unionfs node status, if you can.
|
|
* You need exclusive lock this vnode.
|
|
*/
|
|
void
|
|
unionfs_tryrem_node_status(struct unionfs_node *unp,
|
|
struct unionfs_node_status *unsp)
|
|
{
|
|
KASSERT(NULL != unsp, ("null pointer"));
|
|
ASSERT_VOP_ELOCKED(UNIONFSTOV(unp), "unionfs_get_node_status");
|
|
|
|
if (0 < unsp->uns_lower_opencnt || 0 < unsp->uns_upper_opencnt)
|
|
return;
|
|
|
|
LIST_REMOVE(unsp, uns_list);
|
|
free(unsp, M_TEMP);
|
|
}
|
|
|
|
/*
|
|
* Create upper node attr.
|
|
*/
|
|
void
|
|
unionfs_create_uppervattr_core(struct unionfs_mount *ump,
|
|
struct vattr *lva,
|
|
struct vattr *uva,
|
|
struct thread *td)
|
|
{
|
|
VATTR_NULL(uva);
|
|
uva->va_type = lva->va_type;
|
|
uva->va_atime = lva->va_atime;
|
|
uva->va_mtime = lva->va_mtime;
|
|
uva->va_ctime = lva->va_ctime;
|
|
|
|
switch (ump->um_copymode) {
|
|
case UNIONFS_TRANSPARENT:
|
|
uva->va_mode = lva->va_mode;
|
|
uva->va_uid = lva->va_uid;
|
|
uva->va_gid = lva->va_gid;
|
|
break;
|
|
case UNIONFS_MASQUERADE:
|
|
if (ump->um_uid == lva->va_uid) {
|
|
uva->va_mode = lva->va_mode & 077077;
|
|
uva->va_mode |= (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile) & 0700;
|
|
uva->va_uid = lva->va_uid;
|
|
uva->va_gid = lva->va_gid;
|
|
} else {
|
|
uva->va_mode = (lva->va_type == VDIR ? ump->um_udir : ump->um_ufile);
|
|
uva->va_uid = ump->um_uid;
|
|
uva->va_gid = ump->um_gid;
|
|
}
|
|
break;
|
|
default: /* UNIONFS_TRADITIONAL */
|
|
uva->va_mode = 0777 & ~td->td_proc->p_fd->fd_cmask;
|
|
uva->va_uid = ump->um_uid;
|
|
uva->va_gid = ump->um_gid;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create upper node attr.
|
|
*/
|
|
int
|
|
unionfs_create_uppervattr(struct unionfs_mount *ump,
|
|
struct vnode *lvp,
|
|
struct vattr *uva,
|
|
struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct vattr lva;
|
|
|
|
if ((error = VOP_GETATTR(lvp, &lva, cred)))
|
|
return (error);
|
|
|
|
unionfs_create_uppervattr_core(ump, &lva, uva, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* relookup
|
|
*
|
|
* dvp should be locked on entry and will be locked on return.
|
|
*
|
|
* If an error is returned, *vpp will be invalid, otherwise it will hold a
|
|
* locked, referenced vnode. If *vpp == dvp then remember that only one
|
|
* LK_EXCLUSIVE lock is held.
|
|
*/
|
|
int
|
|
unionfs_relookup(struct vnode *dvp, struct vnode **vpp,
|
|
struct componentname *cnp, struct componentname *cn,
|
|
struct thread *td, char *path, int pathlen, u_long nameiop)
|
|
{
|
|
int error;
|
|
|
|
cn->cn_namelen = pathlen;
|
|
cn->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
|
|
bcopy(path, cn->cn_pnbuf, pathlen);
|
|
cn->cn_pnbuf[pathlen] = '\0';
|
|
|
|
cn->cn_nameiop = nameiop;
|
|
cn->cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
|
|
cn->cn_lkflags = LK_EXCLUSIVE;
|
|
cn->cn_thread = td;
|
|
cn->cn_cred = cnp->cn_cred;
|
|
|
|
cn->cn_nameptr = cn->cn_pnbuf;
|
|
|
|
if (nameiop == DELETE)
|
|
cn->cn_flags |= (cnp->cn_flags & (DOWHITEOUT | SAVESTART));
|
|
else if (RENAME == nameiop)
|
|
cn->cn_flags |= (cnp->cn_flags & SAVESTART);
|
|
else if (nameiop == CREATE)
|
|
cn->cn_flags |= NOCACHE;
|
|
|
|
vref(dvp);
|
|
VOP_UNLOCK(dvp, LK_RELEASE);
|
|
|
|
if ((error = relookup(dvp, vpp, cn))) {
|
|
uma_zfree(namei_zone, cn->cn_pnbuf);
|
|
cn->cn_flags &= ~HASBUF;
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
|
|
} else
|
|
vrele(dvp);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* relookup for CREATE namei operation.
|
|
*
|
|
* dvp is unionfs vnode. dvp should be locked.
|
|
*
|
|
* If it called 'unionfs_copyfile' function by unionfs_link etc,
|
|
* VOP_LOOKUP information is broken.
|
|
* So it need relookup in order to create link etc.
|
|
*/
|
|
int
|
|
unionfs_relookup_for_create(struct vnode *dvp, struct componentname *cnp,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct vnode *udvp;
|
|
struct vnode *vp;
|
|
struct componentname cn;
|
|
|
|
udvp = UNIONFSVPTOUPPERVP(dvp);
|
|
vp = NULLVP;
|
|
|
|
error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
|
|
strlen(cnp->cn_nameptr), CREATE);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (vp != NULLVP) {
|
|
if (udvp == vp)
|
|
vrele(vp);
|
|
else
|
|
vput(vp);
|
|
|
|
error = EEXIST;
|
|
}
|
|
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
if (!error) {
|
|
cn.cn_flags |= (cnp->cn_flags & HASBUF);
|
|
cnp->cn_flags = cn.cn_flags;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* relookup for DELETE namei operation.
|
|
*
|
|
* dvp is unionfs vnode. dvp should be locked.
|
|
*/
|
|
int
|
|
unionfs_relookup_for_delete(struct vnode *dvp, struct componentname *cnp,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct vnode *udvp;
|
|
struct vnode *vp;
|
|
struct componentname cn;
|
|
|
|
udvp = UNIONFSVPTOUPPERVP(dvp);
|
|
vp = NULLVP;
|
|
|
|
error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
|
|
strlen(cnp->cn_nameptr), DELETE);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (vp == NULLVP)
|
|
error = ENOENT;
|
|
else {
|
|
if (udvp == vp)
|
|
vrele(vp);
|
|
else
|
|
vput(vp);
|
|
}
|
|
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
if (!error) {
|
|
cn.cn_flags |= (cnp->cn_flags & HASBUF);
|
|
cnp->cn_flags = cn.cn_flags;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* relookup for RENAME namei operation.
|
|
*
|
|
* dvp is unionfs vnode. dvp should be locked.
|
|
*/
|
|
int
|
|
unionfs_relookup_for_rename(struct vnode *dvp, struct componentname *cnp,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct vnode *udvp;
|
|
struct vnode *vp;
|
|
struct componentname cn;
|
|
|
|
udvp = UNIONFSVPTOUPPERVP(dvp);
|
|
vp = NULLVP;
|
|
|
|
error = unionfs_relookup(udvp, &vp, cnp, &cn, td, cnp->cn_nameptr,
|
|
strlen(cnp->cn_nameptr), RENAME);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (vp != NULLVP) {
|
|
if (udvp == vp)
|
|
vrele(vp);
|
|
else
|
|
vput(vp);
|
|
}
|
|
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
if (!error) {
|
|
cn.cn_flags |= (cnp->cn_flags & HASBUF);
|
|
cnp->cn_flags = cn.cn_flags;
|
|
}
|
|
|
|
return (error);
|
|
|
|
}
|
|
|
|
/*
|
|
* Update the unionfs_node.
|
|
*
|
|
* uvp is new locked upper vnode. unionfs vnode's lock will be exchanged to the
|
|
* uvp's lock and lower's lock will be unlocked.
|
|
*/
|
|
static void
|
|
unionfs_node_update(struct unionfs_node *unp, struct vnode *uvp,
|
|
struct thread *td)
|
|
{
|
|
unsigned count, lockrec;
|
|
struct vnode *vp;
|
|
struct vnode *lvp;
|
|
struct vnode *dvp;
|
|
|
|
vp = UNIONFSTOV(unp);
|
|
lvp = unp->un_lowervp;
|
|
ASSERT_VOP_ELOCKED(lvp, "unionfs_node_update");
|
|
dvp = unp->un_dvp;
|
|
|
|
/*
|
|
* lock update
|
|
*/
|
|
VI_LOCK(vp);
|
|
unp->un_uppervp = uvp;
|
|
vp->v_vnlock = uvp->v_vnlock;
|
|
VI_UNLOCK(vp);
|
|
lockrec = lvp->v_vnlock->lk_recurse;
|
|
for (count = 0; count < lockrec; count++)
|
|
vn_lock(uvp, LK_EXCLUSIVE | LK_CANRECURSE | LK_RETRY);
|
|
|
|
/*
|
|
* cache update
|
|
*/
|
|
if (unp->un_path != NULL && dvp != NULLVP && vp->v_type == VDIR) {
|
|
static struct unionfs_node_hashhead *hd;
|
|
|
|
VI_LOCK(dvp);
|
|
hd = unionfs_get_hashhead(dvp, unp->un_path);
|
|
LIST_REMOVE(unp, un_hash);
|
|
LIST_INSERT_HEAD(hd, unp, un_hash);
|
|
VI_UNLOCK(dvp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new shadow dir.
|
|
*
|
|
* udvp should be locked on entry and will be locked on return.
|
|
*
|
|
* If no error returned, unp will be updated.
|
|
*/
|
|
int
|
|
unionfs_mkshadowdir(struct unionfs_mount *ump, struct vnode *udvp,
|
|
struct unionfs_node *unp, struct componentname *cnp,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct vnode *lvp;
|
|
struct vnode *uvp;
|
|
struct vattr va;
|
|
struct vattr lva;
|
|
struct componentname cn;
|
|
struct mount *mp;
|
|
struct ucred *cred;
|
|
struct ucred *credbk;
|
|
struct uidinfo *rootinfo;
|
|
|
|
if (unp->un_uppervp != NULLVP)
|
|
return (EEXIST);
|
|
|
|
lvp = unp->un_lowervp;
|
|
uvp = NULLVP;
|
|
credbk = cnp->cn_cred;
|
|
|
|
/* Authority change to root */
|
|
rootinfo = uifind((uid_t)0);
|
|
cred = crdup(cnp->cn_cred);
|
|
/*
|
|
* The calls to chgproccnt() are needed to compensate for change_ruid()
|
|
* calling chgproccnt().
|
|
*/
|
|
chgproccnt(cred->cr_ruidinfo, 1, 0);
|
|
change_euid(cred, rootinfo);
|
|
change_ruid(cred, rootinfo);
|
|
change_svuid(cred, (uid_t)0);
|
|
uifree(rootinfo);
|
|
cnp->cn_cred = cred;
|
|
|
|
memset(&cn, 0, sizeof(cn));
|
|
|
|
if ((error = VOP_GETATTR(lvp, &lva, cnp->cn_cred)))
|
|
goto unionfs_mkshadowdir_abort;
|
|
|
|
if ((error = unionfs_relookup(udvp, &uvp, cnp, &cn, td, cnp->cn_nameptr, cnp->cn_namelen, CREATE)))
|
|
goto unionfs_mkshadowdir_abort;
|
|
if (uvp != NULLVP) {
|
|
if (udvp == uvp)
|
|
vrele(uvp);
|
|
else
|
|
vput(uvp);
|
|
|
|
error = EEXIST;
|
|
goto unionfs_mkshadowdir_free_out;
|
|
}
|
|
|
|
if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)))
|
|
goto unionfs_mkshadowdir_free_out;
|
|
unionfs_create_uppervattr_core(ump, &lva, &va, td);
|
|
|
|
error = VOP_MKDIR(udvp, &uvp, &cn, &va);
|
|
|
|
if (!error) {
|
|
unionfs_node_update(unp, uvp, td);
|
|
|
|
/*
|
|
* XXX The bug which cannot set uid/gid was corrected.
|
|
* Ignore errors.
|
|
*/
|
|
va.va_type = VNON;
|
|
VOP_SETATTR(uvp, &va, cn.cn_cred);
|
|
}
|
|
vn_finished_write(mp);
|
|
|
|
unionfs_mkshadowdir_free_out:
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
unionfs_mkshadowdir_abort:
|
|
cnp->cn_cred = credbk;
|
|
chgproccnt(cred->cr_ruidinfo, -1, 0);
|
|
crfree(cred);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Create a new whiteout.
|
|
*
|
|
* dvp should be locked on entry and will be locked on return.
|
|
*/
|
|
int
|
|
unionfs_mkwhiteout(struct vnode *dvp, struct componentname *cnp,
|
|
struct thread *td, char *path)
|
|
{
|
|
int error;
|
|
struct vnode *wvp;
|
|
struct componentname cn;
|
|
struct mount *mp;
|
|
|
|
if (path == NULL)
|
|
path = cnp->cn_nameptr;
|
|
|
|
wvp = NULLVP;
|
|
if ((error = unionfs_relookup(dvp, &wvp, cnp, &cn, td, path, strlen(path), CREATE)))
|
|
return (error);
|
|
if (wvp != NULLVP) {
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
if (dvp == wvp)
|
|
vrele(wvp);
|
|
else
|
|
vput(wvp);
|
|
|
|
return (EEXIST);
|
|
}
|
|
|
|
if ((error = vn_start_write(dvp, &mp, V_WAIT | PCATCH)))
|
|
goto unionfs_mkwhiteout_free_out;
|
|
error = VOP_WHITEOUT(dvp, &cn, CREATE);
|
|
|
|
vn_finished_write(mp);
|
|
|
|
unionfs_mkwhiteout_free_out:
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Create a new vnode for create a new shadow file.
|
|
*
|
|
* If an error is returned, *vpp will be invalid, otherwise it will hold a
|
|
* locked, referenced and opened vnode.
|
|
*
|
|
* unp is never updated.
|
|
*/
|
|
static int
|
|
unionfs_vn_create_on_upper(struct vnode **vpp, struct vnode *udvp,
|
|
struct unionfs_node *unp, struct vattr *uvap,
|
|
struct thread *td)
|
|
{
|
|
struct unionfs_mount *ump;
|
|
struct vnode *vp;
|
|
struct vnode *lvp;
|
|
struct ucred *cred;
|
|
struct vattr lva;
|
|
int fmode;
|
|
int error;
|
|
struct componentname cn;
|
|
|
|
ump = MOUNTTOUNIONFSMOUNT(UNIONFSTOV(unp)->v_mount);
|
|
vp = NULLVP;
|
|
lvp = unp->un_lowervp;
|
|
cred = td->td_ucred;
|
|
fmode = FFLAGS(O_WRONLY | O_CREAT | O_TRUNC | O_EXCL);
|
|
error = 0;
|
|
|
|
if ((error = VOP_GETATTR(lvp, &lva, cred)) != 0)
|
|
return (error);
|
|
unionfs_create_uppervattr_core(ump, &lva, uvap, td);
|
|
|
|
if (unp->un_path == NULL)
|
|
panic("unionfs: un_path is null");
|
|
|
|
cn.cn_namelen = strlen(unp->un_path);
|
|
cn.cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
|
|
bcopy(unp->un_path, cn.cn_pnbuf, cn.cn_namelen + 1);
|
|
cn.cn_nameiop = CREATE;
|
|
cn.cn_flags = (LOCKPARENT | LOCKLEAF | HASBUF | SAVENAME | ISLASTCN);
|
|
cn.cn_lkflags = LK_EXCLUSIVE;
|
|
cn.cn_thread = td;
|
|
cn.cn_cred = cred;
|
|
cn.cn_nameptr = cn.cn_pnbuf;
|
|
|
|
vref(udvp);
|
|
if ((error = relookup(udvp, &vp, &cn)) != 0)
|
|
goto unionfs_vn_create_on_upper_free_out2;
|
|
vrele(udvp);
|
|
|
|
if (vp != NULLVP) {
|
|
if (vp == udvp)
|
|
vrele(vp);
|
|
else
|
|
vput(vp);
|
|
error = EEXIST;
|
|
goto unionfs_vn_create_on_upper_free_out1;
|
|
}
|
|
|
|
if ((error = VOP_CREATE(udvp, &vp, &cn, uvap)) != 0)
|
|
goto unionfs_vn_create_on_upper_free_out1;
|
|
|
|
if ((error = VOP_OPEN(vp, fmode, cred, td, NULL)) != 0) {
|
|
vput(vp);
|
|
goto unionfs_vn_create_on_upper_free_out1;
|
|
}
|
|
error = VOP_ADD_WRITECOUNT(vp, 1);
|
|
CTR3(KTR_VFS, "%s: vp %p v_writecount increased to %d", __func__, vp,
|
|
vp->v_writecount);
|
|
if (error == 0) {
|
|
*vpp = vp;
|
|
} else {
|
|
VOP_CLOSE(vp, fmode, cred, td);
|
|
}
|
|
|
|
unionfs_vn_create_on_upper_free_out1:
|
|
VOP_UNLOCK(udvp, LK_RELEASE);
|
|
|
|
unionfs_vn_create_on_upper_free_out2:
|
|
if (cn.cn_flags & HASBUF) {
|
|
uma_zfree(namei_zone, cn.cn_pnbuf);
|
|
cn.cn_flags &= ~HASBUF;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Copy from lvp to uvp.
|
|
*
|
|
* lvp and uvp should be locked and opened on entry and will be locked and
|
|
* opened on return.
|
|
*/
|
|
static int
|
|
unionfs_copyfile_core(struct vnode *lvp, struct vnode *uvp,
|
|
struct ucred *cred, struct thread *td)
|
|
{
|
|
int error;
|
|
off_t offset;
|
|
int count;
|
|
int bufoffset;
|
|
char *buf;
|
|
struct uio uio;
|
|
struct iovec iov;
|
|
|
|
error = 0;
|
|
memset(&uio, 0, sizeof(uio));
|
|
|
|
uio.uio_td = td;
|
|
uio.uio_segflg = UIO_SYSSPACE;
|
|
uio.uio_offset = 0;
|
|
|
|
buf = malloc(MAXBSIZE, M_TEMP, M_WAITOK);
|
|
|
|
while (error == 0) {
|
|
offset = uio.uio_offset;
|
|
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
iov.iov_base = buf;
|
|
iov.iov_len = MAXBSIZE;
|
|
uio.uio_resid = iov.iov_len;
|
|
uio.uio_rw = UIO_READ;
|
|
|
|
if ((error = VOP_READ(lvp, &uio, 0, cred)) != 0)
|
|
break;
|
|
if ((count = MAXBSIZE - uio.uio_resid) == 0)
|
|
break;
|
|
|
|
bufoffset = 0;
|
|
while (bufoffset < count) {
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
iov.iov_base = buf + bufoffset;
|
|
iov.iov_len = count - bufoffset;
|
|
uio.uio_offset = offset + bufoffset;
|
|
uio.uio_resid = iov.iov_len;
|
|
uio.uio_rw = UIO_WRITE;
|
|
|
|
if ((error = VOP_WRITE(uvp, &uio, 0, cred)) != 0)
|
|
break;
|
|
|
|
bufoffset += (count - bufoffset) - uio.uio_resid;
|
|
}
|
|
|
|
uio.uio_offset = offset + bufoffset;
|
|
}
|
|
|
|
free(buf, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Copy file from lower to upper.
|
|
*
|
|
* If you need copy of the contents, set 1 to docopy. Otherwise, set 0 to
|
|
* docopy.
|
|
*
|
|
* If no error returned, unp will be updated.
|
|
*/
|
|
int
|
|
unionfs_copyfile(struct unionfs_node *unp, int docopy, struct ucred *cred,
|
|
struct thread *td)
|
|
{
|
|
int error;
|
|
struct mount *mp;
|
|
struct vnode *udvp;
|
|
struct vnode *lvp;
|
|
struct vnode *uvp;
|
|
struct vattr uva;
|
|
|
|
lvp = unp->un_lowervp;
|
|
uvp = NULLVP;
|
|
|
|
if ((UNIONFSTOV(unp)->v_mount->mnt_flag & MNT_RDONLY))
|
|
return (EROFS);
|
|
if (unp->un_dvp == NULLVP)
|
|
return (EINVAL);
|
|
if (unp->un_uppervp != NULLVP)
|
|
return (EEXIST);
|
|
udvp = VTOUNIONFS(unp->un_dvp)->un_uppervp;
|
|
if (udvp == NULLVP)
|
|
return (EROFS);
|
|
if ((udvp->v_mount->mnt_flag & MNT_RDONLY))
|
|
return (EROFS);
|
|
|
|
error = VOP_ACCESS(lvp, VREAD, cred, td);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if ((error = vn_start_write(udvp, &mp, V_WAIT | PCATCH)) != 0)
|
|
return (error);
|
|
error = unionfs_vn_create_on_upper(&uvp, udvp, unp, &uva, td);
|
|
if (error != 0) {
|
|
vn_finished_write(mp);
|
|
return (error);
|
|
}
|
|
|
|
if (docopy != 0) {
|
|
error = VOP_OPEN(lvp, FREAD, cred, td, NULL);
|
|
if (error == 0) {
|
|
error = unionfs_copyfile_core(lvp, uvp, cred, td);
|
|
VOP_CLOSE(lvp, FREAD, cred, td);
|
|
}
|
|
}
|
|
VOP_CLOSE(uvp, FWRITE, cred, td);
|
|
VOP_ADD_WRITECOUNT_CHECKED(uvp, -1);
|
|
CTR3(KTR_VFS, "%s: vp %p v_writecount decreased to %d", __func__, uvp,
|
|
uvp->v_writecount);
|
|
|
|
vn_finished_write(mp);
|
|
|
|
if (error == 0) {
|
|
/* Reset the attributes. Ignore errors. */
|
|
uva.va_type = VNON;
|
|
VOP_SETATTR(uvp, &uva, cred);
|
|
}
|
|
|
|
unionfs_node_update(unp, uvp, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* It checks whether vp can rmdir. (check empty)
|
|
*
|
|
* vp is unionfs vnode.
|
|
* vp should be locked.
|
|
*/
|
|
int
|
|
unionfs_check_rmdir(struct vnode *vp, struct ucred *cred, struct thread *td)
|
|
{
|
|
int error;
|
|
int eofflag;
|
|
int lookuperr;
|
|
struct vnode *uvp;
|
|
struct vnode *lvp;
|
|
struct vnode *tvp;
|
|
struct vattr va;
|
|
struct componentname cn;
|
|
/*
|
|
* The size of buf needs to be larger than DIRBLKSIZ.
|
|
*/
|
|
char buf[256 * 6];
|
|
struct dirent *dp;
|
|
struct dirent *edp;
|
|
struct uio uio;
|
|
struct iovec iov;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "unionfs_check_rmdir");
|
|
|
|
eofflag = 0;
|
|
uvp = UNIONFSVPTOUPPERVP(vp);
|
|
lvp = UNIONFSVPTOLOWERVP(vp);
|
|
|
|
/* check opaque */
|
|
if ((error = VOP_GETATTR(uvp, &va, cred)) != 0)
|
|
return (error);
|
|
if (va.va_flags & OPAQUE)
|
|
return (0);
|
|
|
|
/* open vnode */
|
|
#ifdef MAC
|
|
if ((error = mac_vnode_check_open(cred, vp, VEXEC|VREAD)) != 0)
|
|
return (error);
|
|
#endif
|
|
if ((error = VOP_ACCESS(vp, VEXEC|VREAD, cred, td)) != 0)
|
|
return (error);
|
|
if ((error = VOP_OPEN(vp, FREAD, cred, td, NULL)) != 0)
|
|
return (error);
|
|
|
|
uio.uio_rw = UIO_READ;
|
|
uio.uio_segflg = UIO_SYSSPACE;
|
|
uio.uio_td = td;
|
|
uio.uio_offset = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_vnode_check_readdir(td->td_ucred, lvp);
|
|
#endif
|
|
while (!error && !eofflag) {
|
|
iov.iov_base = buf;
|
|
iov.iov_len = sizeof(buf);
|
|
uio.uio_iov = &iov;
|
|
uio.uio_iovcnt = 1;
|
|
uio.uio_resid = iov.iov_len;
|
|
|
|
error = VOP_READDIR(lvp, &uio, cred, &eofflag, NULL, NULL);
|
|
if (error != 0)
|
|
break;
|
|
if (eofflag == 0 && uio.uio_resid == sizeof(buf)) {
|
|
#ifdef DIAGNOSTIC
|
|
panic("bad readdir response from lower FS.");
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
edp = (struct dirent*)&buf[sizeof(buf) - uio.uio_resid];
|
|
for (dp = (struct dirent*)buf; !error && dp < edp;
|
|
dp = (struct dirent*)((caddr_t)dp + dp->d_reclen)) {
|
|
if (dp->d_type == DT_WHT || dp->d_fileno == 0 ||
|
|
(dp->d_namlen == 1 && dp->d_name[0] == '.') ||
|
|
(dp->d_namlen == 2 && !bcmp(dp->d_name, "..", 2)))
|
|
continue;
|
|
|
|
cn.cn_namelen = dp->d_namlen;
|
|
cn.cn_pnbuf = NULL;
|
|
cn.cn_nameptr = dp->d_name;
|
|
cn.cn_nameiop = LOOKUP;
|
|
cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
|
|
cn.cn_lkflags = LK_EXCLUSIVE;
|
|
cn.cn_thread = td;
|
|
cn.cn_cred = cred;
|
|
|
|
/*
|
|
* check entry in lower.
|
|
* Sometimes, readdir function returns
|
|
* wrong entry.
|
|
*/
|
|
lookuperr = VOP_LOOKUP(lvp, &tvp, &cn);
|
|
|
|
if (!lookuperr)
|
|
vput(tvp);
|
|
else
|
|
continue; /* skip entry */
|
|
|
|
/*
|
|
* check entry
|
|
* If it has no exist/whiteout entry in upper,
|
|
* directory is not empty.
|
|
*/
|
|
cn.cn_flags = (LOCKPARENT | LOCKLEAF | SAVENAME | RDONLY | ISLASTCN);
|
|
lookuperr = VOP_LOOKUP(uvp, &tvp, &cn);
|
|
|
|
if (!lookuperr)
|
|
vput(tvp);
|
|
|
|
/* ignore exist or whiteout entry */
|
|
if (!lookuperr ||
|
|
(lookuperr == ENOENT && (cn.cn_flags & ISWHITEOUT)))
|
|
continue;
|
|
|
|
error = ENOTEMPTY;
|
|
}
|
|
}
|
|
|
|
/* close vnode */
|
|
VOP_CLOSE(vp, FREAD, cred, td);
|
|
|
|
return (error);
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
|
|
struct vnode *
|
|
unionfs_checkuppervp(struct vnode *vp, char *fil, int lno)
|
|
{
|
|
struct unionfs_node *unp;
|
|
|
|
unp = VTOUNIONFS(vp);
|
|
|
|
#ifdef notyet
|
|
if (vp->v_op != unionfs_vnodeop_p) {
|
|
printf("unionfs_checkuppervp: on non-unionfs-node.\n");
|
|
#ifdef KDB
|
|
kdb_enter(KDB_WHY_UNIONFS,
|
|
"unionfs_checkuppervp: on non-unionfs-node.\n");
|
|
#endif
|
|
panic("unionfs_checkuppervp");
|
|
}
|
|
#endif
|
|
return (unp->un_uppervp);
|
|
}
|
|
|
|
struct vnode *
|
|
unionfs_checklowervp(struct vnode *vp, char *fil, int lno)
|
|
{
|
|
struct unionfs_node *unp;
|
|
|
|
unp = VTOUNIONFS(vp);
|
|
|
|
#ifdef notyet
|
|
if (vp->v_op != unionfs_vnodeop_p) {
|
|
printf("unionfs_checklowervp: on non-unionfs-node.\n");
|
|
#ifdef KDB
|
|
kdb_enter(KDB_WHY_UNIONFS,
|
|
"unionfs_checklowervp: on non-unionfs-node.\n");
|
|
#endif
|
|
panic("unionfs_checklowervp");
|
|
}
|
|
#endif
|
|
return (unp->un_lowervp);
|
|
}
|
|
#endif
|