fs/xfs/xfs_reflink.h

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Copyright (C) 2016 Oracle.  All Rights Reserved.
0004  * Author: Darrick J. Wong <darrick.wong@oracle.com>
0005  */
0006 #ifndef __XFS_REFLINK_H
0007 #define __XFS_REFLINK_H 1
0008
0009 static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
0010 {
0011     return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
0012 }
0013
0014 static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
0015 {
0016     return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
0017 }
0018
0019 extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
0020         struct xfs_bmbt_irec *irec, bool *shared);
0021 int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
0022         bool *shared);
0023
0024 int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
0025         struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
0026         bool convert_now);
0027 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
0028         xfs_off_t count);
0029
0030 extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
0031         struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
0032         xfs_fileoff_t end_fsb, bool cancel_real);
0033 extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
0034         xfs_off_t count, bool cancel_real);
0035 extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
0036         xfs_off_t count);
0037 extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
0038 extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
0039         struct file *file_out, loff_t pos_out, loff_t len,
0040         unsigned int remap_flags);
0041 extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
0042         struct xfs_inode *ip, bool *has_shared);
0043 extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
0044         struct xfs_trans **tpp);
0045 extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
0046         xfs_off_t len);
0047 extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
0048         struct file *file_out, loff_t pos_out, loff_t *len,
0049         unsigned int remap_flags);
0050 extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
0051         struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
0052         loff_t *remapped);
0053 extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
0054         xfs_extlen_t cowextsize, unsigned int remap_flags);
0055
0056 #endif /* __XFS_REFLINK_H */