![Darrick J. Wong](/assets/img/avatar_default.png)
Define a VFS function which allows userspace to request that the kernel reflink a range of blocks between two files if the ranges' contents match. The function fits the new VFS ioctl that standardizes the checking for the btrfs EXTENT SAME ioctl. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
53 lines
2.3 KiB
C
53 lines
2.3 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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#define XFS_REFLINK_DEDUPE 1 /* only reflink if contents match */
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#define XFS_REFLINK_ALL (XFS_REFLINK_DEDUPE)
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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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unsigned int flags);
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#endif /* __XFS_REFLINK_H */
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