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 9 /* 10 * Check whether it is safe to free COW fork blocks from an inode. It is unsafe 11 * to do so when an inode has dirty cache or I/O in-flight, even if no shared 12 * extents exist in the data fork, because outstanding I/O may target blocks 13 * that were speculatively allocated to the COW fork. 14 */ 15 static inline bool 16 xfs_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 28 int xfs_reflink_trim_around_shared(struct xfs_inode *ip, 29 struct xfs_bmbt_irec *irec, bool *shared); 30 int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap, 31 bool *shared); 32 33 int 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); 36 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset, 37 xfs_off_t count); 38 int xfs_reflink_convert_cow_locked(struct xfs_inode *ip, 39 xfs_fileoff_t offset_fsb, xfs_filblks_t count_fsb); 40 41 extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip, 42 struct xfs_trans **tpp, xfs_fileoff_t offset_fsb, 43 xfs_fileoff_t end_fsb, bool cancel_real); 44 extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset, 45 xfs_off_t count, bool cancel_real); 46 extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset, 47 xfs_off_t count); 48 int xfs_reflink_end_atomic_cow(struct xfs_inode *ip, xfs_off_t offset, 49 xfs_off_t count); 50 extern int xfs_reflink_recover_cow(struct xfs_mount *mp); 51 extern loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in, 52 struct file *file_out, loff_t pos_out, loff_t len, 53 unsigned int remap_flags); 54 extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp, 55 struct xfs_inode *ip, bool *has_shared); 56 extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip, 57 struct xfs_trans **tpp); 58 extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset, 59 xfs_off_t len); 60 extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in, 61 struct file *file_out, loff_t pos_out, loff_t *len, 62 unsigned int remap_flags); 63 extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in, 64 struct xfs_inode *dest, loff_t pos_out, loff_t remap_len, 65 loff_t *remapped); 66 extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen, 67 xfs_extlen_t cowextsize, unsigned int remap_flags); 68 69 bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize); 70 71 xfs_extlen_t xfs_reflink_max_atomic_cow(struct xfs_mount *mp); 72 73 #endif /* __XFS_REFLINK_H */ 74