xfs_aops.h 2.3 KB
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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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 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation.
 *
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 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
#ifndef __XFS_AOPS_H__
#define __XFS_AOPS_H__

extern mempool_t *xfs_ioend_pool;

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/*
 * Types of I/O for bmap clustering and I/O completion tracking.
 */
enum {
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	XFS_IO_DIRECT = 0,	/* special case for direct I/O ioends */
	XFS_IO_DELALLOC,	/* covers delalloc region */
	XFS_IO_UNWRITTEN,	/* covers allocated but uninitialized data */
	XFS_IO_OVERWRITE,	/* covers already allocated extent */
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};

#define XFS_IO_TYPES \
	{ 0,			"" }, \
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	{ XFS_IO_DELALLOC,		"delalloc" }, \
	{ XFS_IO_UNWRITTEN,		"unwritten" }, \
	{ XFS_IO_OVERWRITE,		"overwrite" }
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/*
 * xfs_ioend struct manages large extent writes for XFS.
 * It can manage several multi-page bio's at once.
 */
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typedef struct xfs_ioend {
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	struct xfs_ioend	*io_list;	/* next ioend in chain */
	unsigned int		io_type;	/* delalloc / unwritten */
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	int			io_error;	/* I/O error code */
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	atomic_t		io_remaining;	/* hold count */
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	unsigned int		io_isdirect : 1;/* direct I/O */
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	struct inode		*io_inode;	/* file being written to */
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	struct buffer_head	*io_buffer_head;/* buffer linked list head */
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	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
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	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 */
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	struct xfs_trans	*io_append_trans;/* xact. for size update */
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} xfs_ioend_t;

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extern const struct address_space_operations xfs_address_space_operations;
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extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
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extern void xfs_count_page_state(struct page *, int *, int *);
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#endif /* __XFS_AOPS_H__ */