forked from mirrors/linux
155debbe7e
Enable reflink for realtime devices, as long as the realtime allocation unit is a single fsblock. Signed-off-by: "Darrick J. Wong" <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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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/*
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* Check whether it is safe to free COW fork blocks from an inode. It is unsafe
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* to do so when an inode has dirty cache or I/O in-flight, even if no shared
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* extents exist in the data fork, because outstanding I/O may target blocks
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* that were speculatively allocated to the COW fork.
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*/
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static inline bool
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xfs_can_free_cowblocks(struct xfs_inode *ip)
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{
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struct inode *inode = VFS_I(ip);
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if ((inode->i_state & I_DIRTY_PAGES) ||
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mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
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mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
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atomic_read(&inode->i_dio_count))
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return false;
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return true;
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}
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int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
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struct xfs_bmbt_irec *irec, bool *shared);
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int xfs_bmap_trim_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
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bool *shared);
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int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
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struct xfs_bmbt_irec *cmap, bool *shared, uint *lockmode,
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bool convert_now);
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extern int xfs_reflink_convert_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_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, bool cancel_real);
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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, bool cancel_real);
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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 loff_t xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, loff_t len,
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unsigned int remap_flags);
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extern int xfs_reflink_inode_has_shared_extents(struct xfs_trans *tp,
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struct xfs_inode *ip, bool *has_shared);
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extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
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struct xfs_trans **tpp);
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extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t len);
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extern int xfs_reflink_remap_prep(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, loff_t *len,
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unsigned int remap_flags);
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extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
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struct xfs_inode *dest, loff_t pos_out, loff_t remap_len,
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loff_t *remapped);
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extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
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xfs_extlen_t cowextsize, unsigned int remap_flags);
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bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize);
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#endif /* __XFS_REFLINK_H */
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