linux_kernel/fs/xfs/xfs_aops.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2005-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_AOPS_H__
#define __XFS_AOPS_H__

extern struct bio_set xfs_ioend_bioset;

/*
 * Types of I/O for bmap clustering and I/O completion tracking.
 */
enum {
	XFS_IO_HOLE,		/* covers region without any block allocation */
	XFS_IO_DELALLOC,	/* covers delalloc region */
	XFS_IO_UNWRITTEN,	/* covers allocated but uninitialized data */
	XFS_IO_OVERWRITE,	/* covers already allocated extent */
	XFS_IO_COW,		/* covers copy-on-write extent */
};

#define XFS_IO_TYPES \
	{ XFS_IO_HOLE,			"hole" },	\
	{ XFS_IO_DELALLOC,		"delalloc" },	\
	{ XFS_IO_UNWRITTEN,		"unwritten" },	\
	{ XFS_IO_OVERWRITE,		"overwrite" },	\
	{ XFS_IO_COW,			"CoW" }

/*
 * Structure for buffered I/O completions.
 */
struct xfs_ioend {
	struct list_head	io_list;	/* next ioend in chain */
	unsigned int		io_type;	/* delalloc / unwritten */
	struct inode		*io_inode;	/* file being written to */
	size_t			io_size;	/* size of the extent */
	xfs_off_t		io_offset;	/* offset in the file */
	struct work_struct	io_work;	/* xfsdatad work queue */
	struct xfs_trans	*io_append_trans;/* xact. for size update */
	struct bio		*io_bio;	/* bio being built */
	struct bio		io_inline_bio;	/* MUST BE LAST! */
};

extern const struct address_space_operations xfs_address_space_operations;
extern const struct address_space_operations xfs_dax_aops;

int	xfs_setfilesize(struct xfs_inode *ip, xfs_off_t offset, size_t size);

extern void xfs_count_page_state(struct page *, int *, int *);
extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
extern struct dax_device *xfs_find_daxdev_for_inode(struct inode *);

#endif /* __XFS_AOPS_H__ */