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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_REFLINK_H
#define __XFS_REFLINK_H 1
/*
* Check whether it is safe to free COW fork blocks from an inode. It is unsafe
* to do so when an inode has dirty cache or I/O in-flight, even if no shared
* extents exist in the data fork, because outstanding I/O may target blocks
* that were speculatively allocated to the COW fork.
*/
static inline bool
xfs_can_free_cowblocks(struct xfs_inode *ip)
{
struct inode *inode = VFS_I(ip);
if ((inode->i_state & I_DIRTY_PAGES) ||
mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
atomic_read(&inode->i_dio_count))
return false;
return true;
}
extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
struct xfs_bmbt_irec *irec, bool *shared);
int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
bool *shared);
int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
bool convert_now);
extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t count);
extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
xfs_fileoff_t end_fsb, bool cancel_real);
extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t count, bool cancel_real);
extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t count);
extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out, loff_t len,
unsigned int remap_flags);
extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
struct xfs_inode *ip, bool *has_shared);
extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
struct xfs_trans **tpp);
extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t len);
extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out, loff_t *len,
unsigned int remap_flags);
extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
loff_t *remapped);
extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
xfs_extlen_t cowextsize, unsigned int remap_flags);
#endif /* __XFS_REFLINK_H */
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