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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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 struct workqueue_struct *xfsdatad_workqueue;
22extern struct workqueue_struct *xfsconvertd_workqueue;
23extern mempool_t *xfs_ioend_pool;
24
25/*
26 * Types of I/O for bmap clustering and I/O completion tracking.
27 */
28enum {
29 IO_DIRECT = 0, /* special case for direct I/O ioends */
30 IO_DELALLOC, /* mapping covers delalloc region */
31 IO_UNWRITTEN, /* mapping covers allocated but uninitialized data */
32 IO_OVERWRITE, /* mapping covers already allocated extent */
33};
34
35#define XFS_IO_TYPES \
36 { 0, "" }, \
37 { IO_DELALLOC, "delalloc" }, \
38 { IO_UNWRITTEN, "unwritten" }, \
39 { IO_OVERWRITE, "overwrite" }
40
41/*
42 * xfs_ioend struct manages large extent writes for XFS.
43 * It can manage several multi-page bio's at once.
44 */
45typedef struct xfs_ioend {
46 struct xfs_ioend *io_list; /* next ioend in chain */
47 unsigned int io_type; /* delalloc / unwritten */
48 int io_error; /* I/O error code */
49 atomic_t io_remaining; /* hold count */
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 kiocb *io_iocb;
57 int io_result;
58} xfs_ioend_t;
59
60extern const struct address_space_operations xfs_address_space_operations;
61extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);
62
63extern void xfs_ioend_init(void);
64extern void xfs_ioend_wait(struct xfs_inode *);
65
66extern void xfs_count_page_state(struct page *, int *, int *);
67
68#endif /* __XFS_AOPS_H__ */