root/fs/xfs/xfs_reflink.h

INCLUDED FROM

DEFINITIONS

1. xfs_is_always_cow_inode
2. xfs_is_cow_inode

   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 
   9 static 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 
  15 static 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 
  20 extern 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);
  23 extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
  24                 struct xfs_bmbt_irec *irec, bool *shared);
  25 bool xfs_inode_need_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
  26                 bool *shared);
  27 
  28 extern int xfs_reflink_allocate_cow(struct xfs_inode *ip,
  29                 struct xfs_bmbt_irec *imap, bool *shared, uint *lockmode,
  30                 bool convert_now);
  31 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
  32                 xfs_off_t count);
  33 
  34 extern 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);
  37 extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
  38                 xfs_off_t count, bool cancel_real);
  39 extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
  40                 xfs_off_t count);
  41 extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
  42 extern 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);
  45 extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
  46                 struct xfs_inode *ip, bool *has_shared);
  47 extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
  48                 struct xfs_trans **tpp);
  49 extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
  50                 xfs_off_t len);
  51 extern 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);
  54 extern 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);
  57 extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
  58                 xfs_extlen_t cowextsize, unsigned int remap_flags);
  59 extern void xfs_reflink_remap_unlock(struct file *file_in,
  60                 struct file *file_out);
  61 
  62 #endif /* __XFS_REFLINK_H */