10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0+
23993baebSDarrick J. Wong /*
33993baebSDarrick J. Wong * Copyright (C) 2016 Oracle. All Rights Reserved.
43993baebSDarrick J. Wong * Author: Darrick J. Wong <darrick.wong@oracle.com>
53993baebSDarrick J. Wong */
63993baebSDarrick J. Wong #ifndef __XFS_REFLINK_H
73993baebSDarrick J. Wong #define __XFS_REFLINK_H 1
83993baebSDarrick J. Wong
xfs_is_always_cow_inode(struct xfs_inode * ip)966ae56a5SChristoph Hellwig static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
1066ae56a5SChristoph Hellwig {
11ebd9027dSDave Chinner return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
1266ae56a5SChristoph Hellwig }
1366ae56a5SChristoph Hellwig
xfs_is_cow_inode(struct xfs_inode * ip)1466ae56a5SChristoph Hellwig static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
1566ae56a5SChristoph Hellwig {
1666ae56a5SChristoph Hellwig return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
1766ae56a5SChristoph Hellwig }
1866ae56a5SChristoph Hellwig
19*7b5b1191SBrian Foster /*
20*7b5b1191SBrian Foster * Check whether it is safe to free COW fork blocks from an inode. It is unsafe
21*7b5b1191SBrian Foster * to do so when an inode has dirty cache or I/O in-flight, even if no shared
22*7b5b1191SBrian Foster * extents exist in the data fork, because outstanding I/O may target blocks
23*7b5b1191SBrian Foster * that were speculatively allocated to the COW fork.
24*7b5b1191SBrian Foster */
25*7b5b1191SBrian Foster static inline bool
xfs_can_free_cowblocks(struct xfs_inode * ip)26*7b5b1191SBrian Foster xfs_can_free_cowblocks(struct xfs_inode *ip)
27*7b5b1191SBrian Foster {
28*7b5b1191SBrian Foster struct inode *inode = VFS_I(ip);
29*7b5b1191SBrian Foster
30*7b5b1191SBrian Foster if ((inode->i_state & I_DIRTY_PAGES) ||
31*7b5b1191SBrian Foster mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
32*7b5b1191SBrian Foster mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
33*7b5b1191SBrian Foster atomic_read(&inode->i_dio_count))
34*7b5b1191SBrian Foster return false;
35*7b5b1191SBrian Foster return true;
36*7b5b1191SBrian Foster }
37*7b5b1191SBrian Foster
382a06705cSDarrick J. Wong extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
39d392bc81SChristoph Hellwig struct xfs_bmbt_irec *irec, bool *shared);
40aa124436Szhengbin int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
4166ae56a5SChristoph Hellwig bool *shared);
422a06705cSDarrick J. Wong
43ffb375a8SChristoph Hellwig int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
44ffb375a8SChristoph Hellwig struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
45affe250aSDarrick J. Wong bool convert_now);
465eda4300SDarrick J. Wong extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
475eda4300SDarrick J. Wong xfs_off_t count);
482a06705cSDarrick J. Wong
4943caeb18SDarrick J. Wong extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
5043caeb18SDarrick J. Wong struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
513802a345SChristoph Hellwig xfs_fileoff_t end_fsb, bool cancel_real);
5243caeb18SDarrick J. Wong extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
533802a345SChristoph Hellwig xfs_off_t count, bool cancel_real);
5443caeb18SDarrick J. Wong extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
5543caeb18SDarrick J. Wong xfs_off_t count);
56174edb0eSDarrick J. Wong extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
573f68c1f5SDarrick J. Wong extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
5842ec3d4cSDarrick J. Wong struct file *file_out, loff_t pos_out, loff_t len,
59a91ae49bSDarrick J. Wong unsigned int remap_flags);
60ea7cdd7bSDarrick J. Wong extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
61ea7cdd7bSDarrick J. Wong struct xfs_inode *ip, bool *has_shared);
6298cc2db5SDarrick J. Wong extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
6398cc2db5SDarrick J. Wong struct xfs_trans **tpp);
6498cc2db5SDarrick J. Wong extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
6598cc2db5SDarrick J. Wong xfs_off_t len);
663fc9f5e4SDarrick J. Wong extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
673fc9f5e4SDarrick J. Wong struct file *file_out, loff_t pos_out, loff_t *len,
683fc9f5e4SDarrick J. Wong unsigned int remap_flags);
693fc9f5e4SDarrick J. Wong extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
703fc9f5e4SDarrick J. Wong struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
713fc9f5e4SDarrick J. Wong loff_t *remapped);
723fc9f5e4SDarrick J. Wong extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
733fc9f5e4SDarrick J. Wong xfs_extlen_t cowextsize, unsigned int remap_flags);
7443caeb18SDarrick J. Wong
753993baebSDarrick J. Wong #endif /* __XFS_REFLINK_H */
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