diff options
Diffstat (limited to 'fs/xfs/xfs_reflink.h')
| -rw-r--r-- | fs/xfs/xfs_reflink.h | 76 |
1 files changed, 46 insertions, 30 deletions
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index 701487bab468..9d1ed9bb0bee 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -1,41 +1,42 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2016 Oracle. All Rights Reserved. - * * Author: Darrick J. Wong <darrick.wong@oracle.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef __XFS_REFLINK_H #define __XFS_REFLINK_H 1 -extern int xfs_reflink_find_shared(struct xfs_mount *mp, struct xfs_trans *tp, - xfs_agnumber_t agno, xfs_agblock_t agbno, xfs_extlen_t aglen, - xfs_agblock_t *fbno, xfs_extlen_t *flen, bool find_maximal); -extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, - struct xfs_bmbt_irec *irec, bool *shared, bool *trimmed); +/* + * 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_state_read_once(inode) & 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; +} + +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); -extern int xfs_reflink_reserve_cow(struct xfs_inode *ip, - struct xfs_bmbt_irec *imap, bool *shared); -extern int xfs_reflink_allocate_cow(struct xfs_inode *ip, - struct xfs_bmbt_irec *imap, bool *shared, uint *lockmode); +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 bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset, - struct xfs_bmbt_irec *imap); -extern void xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip, - xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap); +int xfs_reflink_convert_cow_locked(struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, xfs_filblks_t count_fsb); extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip, struct xfs_trans **tpp, xfs_fileoff_t offset_fsb, @@ -44,14 +45,29 @@ 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); +int xfs_reflink_end_atomic_cow(struct xfs_inode *ip, xfs_off_t offset, + xfs_off_t count); extern int xfs_reflink_recover_cow(struct xfs_mount *mp); -extern int xfs_reflink_remap_range(struct file *file_in, loff_t pos_in, - struct file *file_out, loff_t pos_out, u64 len, bool is_dedupe); +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); + +bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize); + +xfs_extlen_t xfs_reflink_max_atomic_cow(struct xfs_mount *mp); #endif /* __XFS_REFLINK_H */ |