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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_H7#define __XFS_REFLINK_H 18 9/*10 * Check whether it is safe to free COW fork blocks from an inode. It is unsafe11 * to do so when an inode has dirty cache or I/O in-flight, even if no shared12 * extents exist in the data fork, because outstanding I/O may target blocks13 * that were speculatively allocated to the COW fork.14 */15static inline bool16xfs_can_free_cowblocks(struct xfs_inode *ip)17{18 struct inode *inode = VFS_I(ip);19 20 if ((inode->i_state & I_DIRTY_PAGES) ||21 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||22 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||23 atomic_read(&inode->i_dio_count))24 return false;25 return true;26}27 28extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,29 struct xfs_bmbt_irec *irec, bool *shared);30int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,31 bool *shared);32 33int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,34 struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,35 bool convert_now);36extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,37 xfs_off_t count);38 39extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,40 struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,41 xfs_fileoff_t end_fsb, bool cancel_real);42extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,43 xfs_off_t count, bool cancel_real);44extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,45 xfs_off_t count);46extern int xfs_reflink_recover_cow(struct xfs_mount *mp);47extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,48 struct file *file_out, loff_t pos_out, loff_t len,49 unsigned int remap_flags);50extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,51 struct xfs_inode *ip, bool *has_shared);52extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,53 struct xfs_trans **tpp);54extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,55 xfs_off_t len);56extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,57 struct file *file_out, loff_t pos_out, loff_t *len,58 unsigned int remap_flags);59extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,60 struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,61 loff_t *remapped);62extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,63 xfs_extlen_t cowextsize, unsigned int remap_flags);64 65#endif /* __XFS_REFLINK_H */66