97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright IBM Corporation, 2010
|
||
|
|
* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of version 2.1 of the GNU Lesser General Public License
|
||
|
|
* as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it would be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
#include <net/9p/9p.h>
|
||
|
|
#include <net/9p/client.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/posix_acl_xattr.h>
|
||
|
|
#include "xattr.h"
|
||
|
|
#include "acl.h"
|
||
|
|
|
||
|
|
static struct posix_acl *__v9fs_get_acl(struct p9_fid *fid, char *name)
|
||
|
|
{
|
||
|
|
ssize_t size;
|
||
|
|
void *value = NULL;
|
||
|
|
struct posix_acl *acl = NULL;;
|
||
|
|
|
||
|
|
size = v9fs_fid_xattr_get(fid, name, NULL, 0);
|
||
|
|
if (size > 0) {
|
||
|
|
value = kzalloc(size, GFP_NOFS);
|
||
|
|
if (!value)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
size = v9fs_fid_xattr_get(fid, name, value, size);
|
||
|
|
if (size > 0) {
|
||
|
|
acl = posix_acl_from_xattr(value, size);
|
||
|
|
if (IS_ERR(acl))
|
||
|
|
goto err_out;
|
||
|
|
}
|
||
|
|
} else if (size == -ENODATA || size == 0 ||
|
||
|
|
size == -ENOSYS || size == -EOPNOTSUPP) {
|
||
|
|
acl = NULL;
|
||
|
|
} else
|
||
|
|
acl = ERR_PTR(-EIO);
|
||
|
|
|
||
|
|
err_out:
|
||
|
|
kfree(value);
|
||
|
|
return acl;
|
||
|
|
}
|
||
|
|
|
||
|
|
int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
|
||
|
|
{
|
||
|
|
int retval = 0;
|
||
|
|
struct posix_acl *pacl, *dacl;
|
||
|
|
|
||
|
|
/* get the default/access acl values and cache them */
|
||
|
|
dacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_DEFAULT);
|
||
|
|
pacl = __v9fs_get_acl(fid, POSIX_ACL_XATTR_ACCESS);
|
||
|
|
|
||
|
|
if (!IS_ERR(dacl) && !IS_ERR(pacl)) {
|
||
|
|
set_cached_acl(inode, ACL_TYPE_DEFAULT, dacl);
|
||
|
|
set_cached_acl(inode, ACL_TYPE_ACCESS, pacl);
|
||
|
|
posix_acl_release(dacl);
|
||
|
|
posix_acl_release(pacl);
|
||
|
|
} else
|
||
|
|
retval = -EIO;
|
||
|
|
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct posix_acl *v9fs_get_cached_acl(struct inode *inode, int type)
|
||
|
|
{
|
||
|
|
struct posix_acl *acl;
|
||
|
|
/*
|
||
|
|
* 9p Always cache the acl value when
|
||
|
|
* instantiating the inode (v9fs_inode_from_fid)
|
||
|
|
*/
|
||
|
|
acl = get_cached_acl(inode, type);
|
||
|
|
BUG_ON(acl == ACL_NOT_CACHED);
|
||
|
|
return acl;
|
||
|
|
}
|
||
|
|
|
||
|
|
int v9fs_check_acl(struct inode *inode, int mask)
|
||
|
|
{
|
||
|
|
struct posix_acl *acl = v9fs_get_cached_acl(inode, ACL_TYPE_ACCESS);
|
||
|
|
|
||
|
|
if (IS_ERR(acl))
|
||
|
|
return PTR_ERR(acl);
|
||
|
|
if (acl) {
|
||
|
|
int error = posix_acl_permission(inode, acl, mask);
|
||
|
|
posix_acl_release(acl);
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
return -EAGAIN;
|
||
|
|
}
|