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For CoW-based atomic writes, reuse the infrastructure for reflink CoW fork support. Add ->iomap_begin() callback xfs_atomic_write_cow_iomap_begin() to create staging mappings in the CoW fork for atomic write updates. The general steps in the function are as follows: - find extent mapping in the CoW fork for the FS block range being written - if part or full extent is found, proceed to process found extent - if no extent found, map in new blocks to the CoW fork - convert unwritten blocks in extent if required - update iomap extent mapping and return The bulk of this function is quite similar to the processing in xfs_reflink_allocate_cow(), where we try to find an extent mapping; if none exists, then allocate a new extent in the CoW fork, convert unwritten blocks, and return a mapping. Performance testing has shown the XFS_ILOCK_EXCL locking to be quite a bottleneck, so this is an area which could be optimised in future. Christoph Hellwig contributed almost all of the code in xfs_atomic_write_cow_iomap_begin(). Reviewed-by: Darrick J. Wong <djwong@kernel.org> [djwong: add a new xfs_can_sw_atomic_write to convey intent better] Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: John Garry <john.g.garry@oracle.com>
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2003-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_IOMAP_H__
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#define __XFS_IOMAP_H__
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#include <linux/iomap.h>
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struct xfs_inode;
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struct xfs_bmbt_irec;
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struct xfs_zone_alloc_ctx;
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int xfs_iomap_write_direct(struct xfs_inode *ip, xfs_fileoff_t offset_fsb,
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xfs_fileoff_t count_fsb, unsigned int flags,
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struct xfs_bmbt_irec *imap, u64 *sequence);
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int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t, bool);
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xfs_fileoff_t xfs_iomap_eof_align_last_fsb(struct xfs_inode *ip,
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xfs_fileoff_t end_fsb);
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u64 xfs_iomap_inode_sequence(struct xfs_inode *ip, u16 iomap_flags);
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int xfs_bmbt_to_iomap(struct xfs_inode *ip, struct iomap *iomap,
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struct xfs_bmbt_irec *imap, unsigned int mapping_flags,
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u16 iomap_flags, u64 sequence_cookie);
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int xfs_zero_range(struct xfs_inode *ip, loff_t pos, loff_t len,
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struct xfs_zone_alloc_ctx *ac, bool *did_zero);
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int xfs_truncate_page(struct xfs_inode *ip, loff_t pos,
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struct xfs_zone_alloc_ctx *ac, bool *did_zero);
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static inline xfs_filblks_t
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xfs_aligned_fsb_count(
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xfs_fileoff_t offset_fsb,
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xfs_filblks_t count_fsb,
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xfs_extlen_t extsz)
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{
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if (extsz) {
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xfs_extlen_t align;
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div_u64_rem(offset_fsb, extsz, &align);
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if (align)
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count_fsb += align;
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div_u64_rem(count_fsb, extsz, &align);
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if (align)
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count_fsb += extsz - align;
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}
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return count_fsb;
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}
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extern const struct iomap_ops xfs_buffered_write_iomap_ops;
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extern const struct iomap_ops xfs_direct_write_iomap_ops;
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extern const struct iomap_ops xfs_zoned_direct_write_iomap_ops;
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extern const struct iomap_ops xfs_read_iomap_ops;
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extern const struct iomap_ops xfs_seek_iomap_ops;
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extern const struct iomap_ops xfs_xattr_iomap_ops;
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extern const struct iomap_ops xfs_dax_write_iomap_ops;
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extern const struct iomap_ops xfs_atomic_write_cow_iomap_ops;
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#endif /* __XFS_IOMAP_H__*/
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