xref: /linux/fs/xfs/xfs_aops.h (revision 2ba66237029d1ad6c1a5e2241b0ffbbfff55f750)
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 	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  */
41 typedef 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 
55 extern const struct address_space_operations xfs_address_space_operations;
56 extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
57 
58 extern void xfs_count_page_state(struct page *, int *, int *);
59 
60 #endif /* __XFS_AOPS_H__ */
61