root/fs/reiserfs/xattr_trusted.c

DEFINITIONS

1. trusted_get
2. trusted_set
3. trusted_del
4. trusted_list

#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,
};