xattr_trusted.c
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#include "reiserfs.h"
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "xattr.h"
#include <asm/uaccess.h>
static int
trusted_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
int handler_flags)
{
if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
return -EINVAL;
if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
return -EPERM;
return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
}
static int
trusted_set(struct dentry *dentry, const char *name, const void *buffer,
size_t size, int flags, int handler_flags)
{
if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
return -EINVAL;
if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
return -EPERM;
return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
}
static size_t trusted_list(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int handler_flags)
{
const size_t len = name_len + 1;
if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(dentry->d_inode))
return 0;
if (list && len <= list_size) {
memcpy(list, name, name_len);
list[name_len] = '\0';
}
return len;
}
const struct xattr_handler reiserfs_xattr_trusted_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = trusted_get,
.set = trusted_set,
.list = trusted_list,
};