2 * Copyright (c) 2005-2006 Silicon Graphics, Inc.
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.
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.
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
18 #ifndef __XFS_AOPS_H__
19 #define __XFS_AOPS_H__
21 extern mempool_t *xfs_ioend_pool;
24 * Types of I/O for bmap clustering and I/O completion tracking.
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 */
33 #define XFS_IO_TYPES \
35 { IO_DELALLOC, "delalloc" }, \
36 { IO_UNWRITTEN, "unwritten" }, \
37 { IO_OVERWRITE, "overwrite" }
40 * xfs_ioend struct manages large extent writes for XFS.
41 * It can manage several multi-page bio's at once.
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;
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);
64 extern void xfs_count_page_state(struct page *, int *, int *);
66 #endif /* __XFS_AOPS_H__ */