xattr_trusted.c
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#include <linux/reiserfs_fs.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/reiserfs_xattr.h>
#include <asm/uaccess.h>
static int
trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
{
if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs(inode->i_sb))
return -EOPNOTSUPP;
if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
return -EPERM;
return reiserfs_xattr_get(inode, name, buffer, size);
}
static int
trusted_set(struct inode *inode, const char *name, const void *buffer,
size_t size, int flags)
{
if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs(inode->i_sb))
return -EOPNOTSUPP;
if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
return -EPERM;
return reiserfs_xattr_set(inode, name, buffer, size, flags);
}
static int trusted_del(struct inode *inode, const char *name)
{
if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
return -EINVAL;
if (!reiserfs_xattrs(inode->i_sb))
return -EOPNOTSUPP;
if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
return -EPERM;
return 0;
}
static int
trusted_list(struct inode *inode, const char *name, int namelen, char *out)
{
int len = namelen;
if (!reiserfs_xattrs(inode->i_sb))
return 0;
if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
return 0;
if (out)
memcpy(out, name, len);
return len;
}
struct reiserfs_xattr_handler trusted_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = trusted_get,
.set = trusted_set,
.del = trusted_del,
.list = trusted_list,
};