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862bb360ef
Reflink extents from one file to another; that is to say, iteratively remove the mappings from the destination file, copy the mappings from the source file to the destination file, and increment the reference count of all the blocks that got remapped. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
50 lines
2.2 KiB
C
50 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __XFS_REFLINK_H
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#define __XFS_REFLINK_H 1
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extern int xfs_reflink_find_shared(struct xfs_mount *mp, xfs_agnumber_t agno,
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xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno,
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xfs_extlen_t *flen, bool find_maximal);
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extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
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struct xfs_bmbt_irec *irec, bool *shared, bool *trimmed);
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extern int xfs_reflink_reserve_cow_range(struct xfs_inode *ip,
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xfs_off_t offset, xfs_off_t count);
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extern int xfs_reflink_allocate_cow_range(struct xfs_inode *ip,
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xfs_off_t offset, xfs_off_t count);
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extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset,
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struct xfs_bmbt_irec *imap, bool *need_alloc);
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extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip,
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xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap);
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extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
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struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
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xfs_fileoff_t end_fsb);
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extern int xfs_reflink_cancel_cow_range(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
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extern int xfs_reflink_remap_range(struct xfs_inode *src, xfs_off_t srcoff,
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struct xfs_inode *dest, xfs_off_t destoff, xfs_off_t len);
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#endif /* __XFS_REFLINK_H */
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