/*
   * linux/fs/hfsplus/posix_acl.c
   *
   * Vyacheslav Dubeyko <slava@dubeyko.com>
   *
   * Handler for Posix Access Control Lists (ACLs) support.
   */
  
  #include "hfsplus_fs.h"
  #include "xattr.h"
  #include "acl.h"
  
  struct posix_acl *hfsplus_get_posix_acl(struct inode *inode, int type)
  {
  	struct posix_acl *acl;
  	char *xattr_name;
  	char *value = NULL;
  	ssize_t size;

  	hfs_dbg(ACL_MOD, "[%s]: ino %lu
  ", __func__, inode->i_ino);

  
  	switch (type) {
  	case ACL_TYPE_ACCESS:

  		xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;

  		break;
  	case ACL_TYPE_DEFAULT:

  		xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;

  		break;
  	default:
  		return ERR_PTR(-EINVAL);
  	}
  
  	size = __hfsplus_getxattr(inode, xattr_name, NULL, 0);
  
  	if (size > 0) {
  		value = (char *)hfsplus_alloc_attr_entry();
  		if (unlikely(!value))
  			return ERR_PTR(-ENOMEM);
  		size = __hfsplus_getxattr(inode, xattr_name, value, size);
  	}
  
  	if (size > 0)
  		acl = posix_acl_from_xattr(&init_user_ns, value, size);
  	else if (size == -ENODATA)
  		acl = NULL;
  	else
  		acl = ERR_PTR(size);
  
  	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);

  	return acl;
  }

  int hfsplus_set_posix_acl(struct inode *inode, struct posix_acl *acl,
  		int type)

  {
  	int err;
  	char *xattr_name;
  	size_t size = 0;
  	char *value = NULL;

  	hfs_dbg(ACL_MOD, "[%s]: ino %lu
  ", __func__, inode->i_ino);

  
  	switch (type) {
  	case ACL_TYPE_ACCESS:

  		xattr_name = XATTR_NAME_POSIX_ACL_ACCESS;

  		if (acl) {

  			err = posix_acl_update_mode(inode, &inode->i_mode, &acl);
  			if (err)

  				return err;
  		}
  		err = 0;
  		break;
  
  	case ACL_TYPE_DEFAULT:

  		xattr_name = XATTR_NAME_POSIX_ACL_DEFAULT;

  		if (!S_ISDIR(inode->i_mode))
  			return acl ? -EACCES : 0;
  		break;
  
  	default:
  		return -EINVAL;
  	}
  
  	if (acl) {
  		size = posix_acl_xattr_size(acl->a_count);
  		if (unlikely(size > HFSPLUS_MAX_INLINE_DATA_SIZE))
  			return -ENOMEM;
  		value = (char *)hfsplus_alloc_attr_entry();
  		if (unlikely(!value))
  			return -ENOMEM;
  		err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
  		if (unlikely(err < 0))
  			goto end_set_acl;
  	}
  
  	err = __hfsplus_setxattr(inode, xattr_name, value, size, 0);
  
  end_set_acl:
  	hfsplus_destroy_attr_entry((hfsplus_attr_entry *)value);
  
  	if (!err)
  		set_cached_acl(inode, type, acl);
  
  	return err;
  }
  
  int hfsplus_init_posix_acl(struct inode *inode, struct inode *dir)
  {
  	int err = 0;

  	struct posix_acl *default_acl, *acl;

  
  	hfs_dbg(ACL_MOD,
  		"[%s]: ino %lu, dir->ino %lu
  ",
  		__func__, inode->i_ino, dir->i_ino);
  
  	if (S_ISLNK(inode->i_mode))
  		return 0;

  	err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
  	if (err)

  		return err;

  	if (default_acl) {
  		err = hfsplus_set_posix_acl(inode, default_acl,
  					    ACL_TYPE_DEFAULT);
  		posix_acl_release(default_acl);

  	}

  	if (acl) {
  		if (!err)
  			err = hfsplus_set_posix_acl(inode, acl,
  						    ACL_TYPE_ACCESS);
  		posix_acl_release(acl);
  	}

  	return err;
  }