text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright (C) 2016 Oracle.  All Rights Reserved.
   * Author: Darrick J. Wong <darrick.wong@oracle.com>
   */
  #ifndef __XFS_REFLINK_H
  #define __XFS_REFLINK_H 1
  
  static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
  {
  	return ip->i_mount->m_always_cow &&
  		xfs_sb_version_hasreflink(&ip->i_mount->m_sb);
  }
  
  static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
  {
  	return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
  }
  
  extern int xfs_reflink_find_shared(struct xfs_mount *mp, struct xfs_trans *tp,
  		xfs_agnumber_t agno, xfs_agblock_t agbno, xfs_extlen_t aglen,
  		xfs_agblock_t *fbno, xfs_extlen_t *flen, bool find_maximal);
  extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
  		struct xfs_bmbt_irec *irec, bool *shared);
  bool xfs_inode_need_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
  		bool *shared);
  
  int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
  		struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
  		bool convert_now);
  extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
  		xfs_off_t count);
  
  extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
  		struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
  		xfs_fileoff_t end_fsb, bool cancel_real);
  extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
  		xfs_off_t count, bool cancel_real);
  extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
  		xfs_off_t count);
  extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
  extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
  		struct file *file_out, loff_t pos_out, loff_t len,
  		unsigned int remap_flags);
  extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
  		struct xfs_inode *ip, bool *has_shared);
  extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
  		struct xfs_trans **tpp);
  extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
  		xfs_off_t len);
  extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
  		struct file *file_out, loff_t pos_out, loff_t *len,
  		unsigned int remap_flags);
  extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
  		struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
  		loff_t *remapped);
  extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
  		xfs_extlen_t cowextsize, unsigned int remap_flags);
  extern void xfs_reflink_remap_unlock(struct file *file_in,
  		struct file *file_out);
  
  #endif /* __XFS_REFLINK_H */
  