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
xfs_is_always_cow_inode(struct xfs_inode * ip)9 static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
10 {
11 return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
12 }
13
xfs_is_cow_inode(struct xfs_inode * ip)14 static inline bool xfs_is_cow_inode(struct xfs_inode *ip)
15 {
16 return xfs_is_reflink_inode(ip) || xfs_is_always_cow_inode(ip);
17 }
18
19 /*
20 * Check whether it is safe to free COW fork blocks from an inode. It is unsafe
21 * to do so when an inode has dirty cache or I/O in-flight, even if no shared
22 * extents exist in the data fork, because outstanding I/O may target blocks
23 * that were speculatively allocated to the COW fork.
24 */
25 static inline bool
xfs_can_free_cowblocks(struct xfs_inode * ip)26 xfs_can_free_cowblocks(struct xfs_inode *ip)
27 {
28 struct inode *inode = VFS_I(ip);
29
30 if ((inode->i_state & I_DIRTY_PAGES) ||
31 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
32 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
33 atomic_read(&inode->i_dio_count))
34 return false;
35 return true;
36 }
37
38 extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
39 struct xfs_bmbt_irec *irec, bool *shared);
40 int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
41 bool *shared);
42
43 int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
44 struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
45 bool convert_now);
46 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
47 xfs_off_t count);
48
49 extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
50 struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
51 xfs_fileoff_t end_fsb, bool cancel_real);
52 extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
53 xfs_off_t count, bool cancel_real);
54 extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
55 xfs_off_t count);
56 extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
57 extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
58 struct file *file_out, loff_t pos_out, loff_t len,
59 unsigned int remap_flags);
60 extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
61 struct xfs_inode *ip, bool *has_shared);
62 extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
63 struct xfs_trans **tpp);
64 extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
65 xfs_off_t len);
66 extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
67 struct file *file_out, loff_t pos_out, loff_t *len,
68 unsigned int remap_flags);
69 extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
70 struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
71 loff_t *remapped);
72 extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
73 xfs_extlen_t cowextsize, unsigned int remap_flags);
74
75 #endif /* __XFS_REFLINK_H */
76