[linux-2.6-block.git] / fs / xfs / xfs_aops.h

/*
 * Copyright (c) 2005-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_AOPS_H__
#define __XFS_AOPS_H__

extern struct workqueue_struct *xfsdatad_workqueue;
extern struct workqueue_struct *xfsconvertd_workqueue;
extern mempool_t *xfs_ioend_pool;

/*
 * Types of I/O for bmap clustering and I/O completion tracking.
 */
enum {
	IO_DIRECT = 0,	/* special case for direct I/O ioends */
	IO_DELALLOC,	/* mapping covers delalloc region */
	IO_UNWRITTEN,	/* mapping covers allocated but uninitialized data */
	IO_OVERWRITE,	/* mapping covers already allocated extent */
};

#define XFS_IO_TYPES \
	{ 0,			"" }, \
	{ IO_DELALLOC,		"delalloc" }, \
	{ IO_UNWRITTEN,		"unwritten" }, \
	{ IO_OVERWRITE,		"overwrite" }

/*
 * xfs_ioend struct manages large extent writes for XFS.
 * It can manage several multi-page bio's at once.
 */
typedef struct xfs_ioend {
	struct xfs_ioend	*io_list;	/* next ioend in chain */
	unsigned int		io_type;	/* delalloc / unwritten */
	int			io_error;	/* I/O error code */
	atomic_t		io_remaining;	/* hold count */
	unsigned int		io_isasync : 1;	/* needs aio_complete */
	struct inode		*io_inode;	/* file being written to */
	struct buffer_head	*io_buffer_head;/* buffer linked list head */
	struct buffer_head	*io_buffer_tail;/* buffer linked list tail */
	size_t			io_size;	/* size of the extent */
	xfs_off_t		io_offset;	/* offset in the file */
	struct work_struct	io_work;	/* xfsdatad work queue */
	struct kiocb		*io_iocb;
	int			io_result;
} xfs_ioend_t;

extern const struct address_space_operations xfs_address_space_operations;
extern int xfs_get_blocks(struct inode *, sector_t, struct buffer_head *, int);

extern void xfs_count_page_state(struct page *, int *, int *);

#endif /* __XFS_AOPS_H__ */
Commit	Line	Data
65b3da37	1	/*
ad723875	2	* Copyright (c) 2005-2006 Silicon Graphics, Inc.
7b718769	3	* All Rights Reserved.
65b3da37	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
65b3da37 CH	7	* published by the Free Software Foundation.
65b3da37 CH	8	*
7b718769 NS	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.
65b3da37	13	*
7b718769 NS	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
65b3da37 CH	17	*/
	18	#ifndef __XFS_AOPS_H__
	19	#define __XFS_AOPS_H__
	20
	21	extern struct workqueue_struct *xfsdatad_workqueue;
c626d174	22	extern struct workqueue_struct *xfsconvertd_workqueue;
65b3da37 CH	23	extern mempool_t *xfs_ioend_pool;
65b3da37 CH	24
a206c817 CH	25	/*
	26	* Types of I/O for bmap clustering and I/O completion tracking.
	27	*/
	28	enum {
	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
f6d6d4fc CH	41	/*
	42	* xfs_ioend struct manages large extent writes for XFS.
	43	* It can manage several multi-page bio's at once.
	44	*/
65b3da37	45	typedef struct xfs_ioend {
f6d6d4fc CH	46	struct xfs_ioend io_list; / next ioend in chain */
f6d6d4fc CH	47	unsigned int io_type; /* delalloc / unwritten */
7d04a335	48	int io_error; /* I/O error code */
65b3da37	49	atomic_t io_remaining; /* hold count */
c859cdd1	50	unsigned int io_isasync : 1; /* needs aio_complete */
b677c210	51	struct inode io_inode; / file being written to */
c1a073bd	52	struct buffer_head io_buffer_head;/ buffer linked list head */
f6d6d4fc	53	struct buffer_head io_buffer_tail;/ buffer linked list tail */
65b3da37 CH	54	size_t io_size; /* size of the extent */
	55	xfs_off_t io_offset; /* offset in the file */
	56	struct work_struct io_work; /* xfsdatad work queue */
40e2e973 CH	57	struct kiocb *io_iocb;
40e2e973 CH	58	int io_result;
65b3da37 CH	59	} xfs_ioend_t;
65b3da37 CH	60
f5e54d6e	61	extern const struct address_space_operations xfs_address_space_operations;
c2536668	62	extern int xfs_get_blocks(struct inode , sector_t, struct buffer_head , int);
f6d6d4fc	63
20cb52eb	64	extern void xfs_count_page_state(struct page , int , int *);
0b1b213f	65
ad723875	66	#endif /* __XFS_AOPS_H__ */