d9a738597f
Allow requests for security.* and trusted.* xattr name spaces to pass through to server. The new files are 99% cut and paste from fs/9p/xattr_user.c with the namespaces changed. It has the intended effect in superficial testing. I do not know much detail about how these namespaces are used, but passing them through to the server, which can decide whether to handle them or not, seems reasonable. I want to support a use case where an ext4 file system is mounted via 9P, then re-exported via samba to windows clients in a cluster. Windows wants to store xattrs such as security.NTACL. This works when ext4 directly backs samba, but not when 9P is inserted. This use case is documented here: http://code.google.com/p/diod/issues/detail?id=95 Signed-off-by: Jim Garlick <garlick@llnl.gov> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
81 lines
2.1 KiB
C
81 lines
2.1 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/string.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/slab.h>
|
|
#include "xattr.h"
|
|
|
|
static int v9fs_xattr_security_get(struct dentry *dentry, const char *name,
|
|
void *buffer, size_t size, int type)
|
|
{
|
|
int retval;
|
|
char *full_name;
|
|
size_t name_len;
|
|
size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
|
|
|
|
if (name == NULL)
|
|
return -EINVAL;
|
|
|
|
if (strcmp(name, "") == 0)
|
|
return -EINVAL;
|
|
|
|
name_len = strlen(name);
|
|
full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
|
|
if (!full_name)
|
|
return -ENOMEM;
|
|
memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
|
|
memcpy(full_name+prefix_len, name, name_len);
|
|
full_name[prefix_len + name_len] = '\0';
|
|
|
|
retval = v9fs_xattr_get(dentry, full_name, buffer, size);
|
|
kfree(full_name);
|
|
return retval;
|
|
}
|
|
|
|
static int v9fs_xattr_security_set(struct dentry *dentry, const char *name,
|
|
const void *value, size_t size, int flags, int type)
|
|
{
|
|
int retval;
|
|
char *full_name;
|
|
size_t name_len;
|
|
size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
|
|
|
|
if (name == NULL)
|
|
return -EINVAL;
|
|
|
|
if (strcmp(name, "") == 0)
|
|
return -EINVAL;
|
|
|
|
name_len = strlen(name);
|
|
full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
|
|
if (!full_name)
|
|
return -ENOMEM;
|
|
memcpy(full_name, XATTR_SECURITY_PREFIX, prefix_len);
|
|
memcpy(full_name + prefix_len, name, name_len);
|
|
full_name[prefix_len + name_len] = '\0';
|
|
|
|
retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
|
|
kfree(full_name);
|
|
return retval;
|
|
}
|
|
|
|
struct xattr_handler v9fs_xattr_security_handler = {
|
|
.prefix = XATTR_SECURITY_PREFIX,
|
|
.get = v9fs_xattr_security_get,
|
|
.set = v9fs_xattr_security_set,
|
|
};
|