1/*
2 * Copyright (c) 2005-2006 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18#ifndef __XFS_AOPS_H__
19#define __XFS_AOPS_H__
20
21extern mempool_t *xfs_ioend_pool;
22
23/*
24 * Types of I/O for bmap clustering and I/O completion tracking.
25 */
26enum {
27	XFS_IO_DELALLOC,	/* covers delalloc region */
28	XFS_IO_UNWRITTEN,	/* covers allocated but uninitialized data */
29	XFS_IO_OVERWRITE,	/* covers already allocated extent */
30};
31
32#define XFS_IO_TYPES \
33	{ XFS_IO_DELALLOC,		"delalloc" }, \
34	{ XFS_IO_UNWRITTEN,		"unwritten" }, \
35	{ XFS_IO_OVERWRITE,		"overwrite" }
36
37/*
38 * xfs_ioend struct manages large extent writes for XFS.
39 * It can manage several multi-page bio's at once.
40 */
41typedef struct xfs_ioend {
42	struct xfs_ioend	*io_list;	/* next ioend in chain */
43	unsigned int		io_type;	/* delalloc / unwritten */
44	int			io_error;	/* I/O error code */
45	atomic_t		io_remaining;	/* hold count */
46	struct inode		*io_inode;	/* file being written to */
47	struct buffer_head	*io_buffer_head;/* buffer linked list head */
48	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
49	size_t			io_size;	/* size of the extent */
50	xfs_off_t		io_offset;	/* offset in the file */
51	struct work_struct	io_work;	/* xfsdatad work queue */
52	struct xfs_trans	*io_append_trans;/* xact. for size update */
53} xfs_ioend_t;
54
55extern const struct address_space_operations xfs_address_space_operations;
56extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
57
58extern void xfs_count_page_state(struct page *, int *, int *);
59
60#endif /* __XFS_AOPS_H__ */
61