text: /* SPDX-License-Identifier: GPL-2.0-only */
  /*
   * Copyright (C) 2017-2018 HUAWEI, Inc.
   *             http://www.huawei.com/
   * Created by Gao Xiang <gaoxiang25@huawei.com>
   */
  #ifndef __EROFS_XATTR_H
  #define __EROFS_XATTR_H
  
  #include "internal.h"
  #include <linux/posix_acl_xattr.h>
  #include <linux/xattr.h>
  
  /* Attribute not found */
  #define ENOATTR         ENODATA
  
  static inline unsigned int inlinexattr_header_size(struct inode *inode)
  {
  	return sizeof(struct erofs_xattr_ibody_header) +
  		sizeof(u32) * EROFS_I(inode)->xattr_shared_count;
  }
  
  static inline erofs_blk_t xattrblock_addr(struct erofs_sb_info *sbi,
  					  unsigned int xattr_id)
  {
  #ifdef CONFIG_EROFS_FS_XATTR
  	return sbi->xattr_blkaddr +
  		xattr_id * sizeof(__u32) / EROFS_BLKSIZ;
  #else
  	return 0;
  #endif
  }
  
  static inline unsigned int xattrblock_offset(struct erofs_sb_info *sbi,
  					     unsigned int xattr_id)
  {
  	return (xattr_id * sizeof(__u32)) % EROFS_BLKSIZ;
  }
  
  #ifdef CONFIG_EROFS_FS_XATTR
  extern const struct xattr_handler erofs_xattr_user_handler;
  extern const struct xattr_handler erofs_xattr_trusted_handler;
  #ifdef CONFIG_EROFS_FS_SECURITY
  extern const struct xattr_handler erofs_xattr_security_handler;
  #endif
  
  static inline const struct xattr_handler *erofs_xattr_handler(unsigned int idx)
  {
  static const struct xattr_handler *xattr_handler_map[] = {
  	[EROFS_XATTR_INDEX_USER] = &erofs_xattr_user_handler,
  #ifdef CONFIG_EROFS_FS_POSIX_ACL
  	[EROFS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler,
  	[EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT] =
  		&posix_acl_default_xattr_handler,
  #endif
  	[EROFS_XATTR_INDEX_TRUSTED] = &erofs_xattr_trusted_handler,
  #ifdef CONFIG_EROFS_FS_SECURITY
  	[EROFS_XATTR_INDEX_SECURITY] = &erofs_xattr_security_handler,
  #endif
  };
  
  	return idx && idx < ARRAY_SIZE(xattr_handler_map) ?
  		xattr_handler_map[idx] : NULL;
  }
  
  extern const struct xattr_handler *erofs_xattr_handlers[];
  
  int erofs_getxattr(struct inode *, int, const char *, void *, size_t);
  ssize_t erofs_listxattr(struct dentry *, char *, size_t);
  #else
  static inline int erofs_getxattr(struct inode *inode, int index,
  				 const char *name, void *buffer,
  				 size_t buffer_size)
  {
  	return -EOPNOTSUPP;
  }
  
  static inline ssize_t erofs_listxattr(struct dentry *dentry,
  				      char *buffer, size_t buffer_size)
  {
  	return -EOPNOTSUPP;
  }
  #endif	/* !CONFIG_EROFS_FS_XATTR */
  
  #ifdef CONFIG_EROFS_FS_POSIX_ACL
  struct posix_acl *erofs_get_acl(struct inode *inode, int type);
  #else
  #define erofs_get_acl	(NULL)
  #endif
  
  #endif
  
  