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 
21 extern mempool_t *xfs_ioend_pool;
22 
23 /*
24  * Types of I/O for bmap clustering and I/O completion tracking.
25  */
26 enum {
27 	IO_DIRECT = 0,	/* special case for direct I/O ioends */
28 	IO_DELALLOC,	/* mapping covers delalloc region */
29 	IO_UNWRITTEN,	/* mapping covers allocated but uninitialized data */
30 	IO_OVERWRITE,	/* mapping covers already allocated extent */
31 };
32 
33 #define XFS_IO_TYPES \
34 	{ 0,			"" }, \
35 	{ IO_DELALLOC,		"delalloc" }, \
36 	{ IO_UNWRITTEN,		"unwritten" }, \
37 	{ IO_OVERWRITE,		"overwrite" }
38 
39 /*
40  * xfs_ioend struct manages large extent writes for XFS.
41  * It can manage several multi-page bio's at once.
42  */
43 typedef struct xfs_ioend {
44 	struct xfs_ioend	*io_list;	/* next ioend in chain */
45 	unsigned int		io_type;	/* delalloc / unwritten */
46 	int			io_error;	/* I/O error code */
47 	atomic_t		io_remaining;	/* hold count */
48 	unsigned int		io_isasync : 1;	/* needs aio_complete */
49 	unsigned int		io_isdirect : 1;/* direct I/O */
50 	struct inode		*io_inode;	/* file being written to */
51 	struct buffer_head	*io_buffer_head;/* buffer linked list head */
52 	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
53 	size_t			io_size;	/* size of the extent */
54 	xfs_off_t		io_offset;	/* offset in the file */
55 	struct work_struct	io_work;	/* xfsdatad work queue */
56 	struct xfs_trans	*io_append_trans;/* xact. for size update */
57 	struct kiocb		*io_iocb;
58 	int			io_result;
59 } xfs_ioend_t;
60 
61 extern const struct address_space_operations xfs_address_space_operations;
62 extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
63 
64 extern void xfs_count_page_state(struct page *, int *, int *);
65 
66 #endif /* __XFS_AOPS_H__ */
67