5c665e5b5a
We can handle the existing cow mapping case as a special case directly in xfs_writepage_map, and share code for allocating delalloc blocks with regular I/O in xfs_map_blocks. This means we need to always call xfs_map_blocks for reflink inodes, but we can still skip most of the work if it turns out that there is no COW mapping overlapping the current block. As a subtle detail we need to start caching holes in the wpc to deal with the case of COW reservations between EOF. But we'll need that infrastructure later anyway, so this is no big deal. Based on a patch from Dave Chinner. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2005-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_AOPS_H__
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#define __XFS_AOPS_H__
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extern struct bio_set xfs_ioend_bioset;
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/*
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* Types of I/O for bmap clustering and I/O completion tracking.
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*/
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enum {
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XFS_IO_INVALID, /* initial state */
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XFS_IO_DELALLOC, /* covers delalloc region */
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XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */
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XFS_IO_OVERWRITE, /* covers already allocated extent */
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XFS_IO_COW, /* covers copy-on-write extent */
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XFS_IO_HOLE, /* covers region without any block allocation */
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};
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#define XFS_IO_TYPES \
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{ XFS_IO_INVALID, "invalid" }, \
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{ XFS_IO_DELALLOC, "delalloc" }, \
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{ XFS_IO_UNWRITTEN, "unwritten" }, \
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{ XFS_IO_OVERWRITE, "overwrite" }, \
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{ XFS_IO_COW, "CoW" }, \
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{ XFS_IO_HOLE, "hole" }
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/*
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* Structure for buffered I/O completions.
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*/
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struct xfs_ioend {
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struct list_head io_list; /* next ioend in chain */
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unsigned int io_type; /* delalloc / unwritten */
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struct inode *io_inode; /* file being written to */
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size_t io_size; /* size of the extent */
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xfs_off_t io_offset; /* offset in the file */
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struct work_struct io_work; /* xfsdatad work queue */
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struct xfs_trans *io_append_trans;/* xact. for size update */
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struct bio *io_bio; /* bio being built */
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struct bio io_inline_bio; /* MUST BE LAST! */
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};
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extern const struct address_space_operations xfs_address_space_operations;
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extern const struct address_space_operations xfs_dax_aops;
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int xfs_setfilesize(struct xfs_inode *ip, xfs_off_t offset, size_t size);
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extern void xfs_count_page_state(struct page *, int *, int *);
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extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
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extern struct dax_device *xfs_find_daxdev_for_inode(struct inode *);
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#endif /* __XFS_AOPS_H__ */
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