LXR linux/fs/xfs/xfs

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Oracle.  All Rights Reserved.
   4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5 */
   6#ifndef __XFS_REFLINK_H
   7#define __XFS_REFLINK_H 1
   8
   9static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
  10{
  11        return ip->i_mount->m_always_cow &&
  12                xfs_sb_version_hasreflink(&ip->i_mount->m_sb);
  13}
  14
  15static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
  16{
  17        return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
  18}
  19
  20extern int xfs_reflink_find_shared(struct xfs_mount *mp, struct xfs_trans *tp,
  21                xfs_agnumber_t agno, xfs_agblock_t agbno, xfs_extlen_t aglen,
  22                xfs_agblock_t *fbno, xfs_extlen_t *flen, bool find_maximal);
  23extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
  24                struct xfs_bmbt_irec *irec, bool *shared);
  25int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
  26                bool *shared);
  27
  28int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
  29                struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
  30                bool convert_now);
  31extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
  32                xfs_off_t count);
  33
  34extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
  35                struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
  36                xfs_fileoff_t end_fsb, bool cancel_real);
  37extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
  38                xfs_off_t count, bool cancel_real);
  39extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
  40                xfs_off_t count);
  41extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
  42extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
  43                struct file *file_out, loff_t pos_out, loff_t len,
  44                unsigned int remap_flags);
  45extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
  46                struct xfs_inode *ip, bool *has_shared);
  47extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
  48                struct xfs_trans **tpp);
  49extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
  50                xfs_off_t len);
  51extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
  52                struct file *file_out, loff_t pos_out, loff_t *len,
  53                unsigned int remap_flags);
  54extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
  55                struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
  56                loff_t *remapped);
  57extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
  58                xfs_extlen_t cowextsize, unsigned int remap_flags);
  59
  60#endif /* __XFS_REFLINK_H */
  61