[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 mempool_t *xfs_ioend_pool;

/*
 * Types of I/O for bmap clustering and I/O completion tracking.
 */
enum {
	XFS_IO_DELALLOC,	/* covers delalloc region */
	XFS_IO_UNWRITTEN,	/* covers allocated but uninitialized data */
	XFS_IO_OVERWRITE,	/* covers already allocated extent */
};

#define XFS_IO_TYPES \
	{ XFS_IO_DELALLOC,		"delalloc" }, \
	{ XFS_IO_UNWRITTEN,		"unwritten" }, \
	{ XFS_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 */
	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 xfs_trans	*io_append_trans;/* xact. for size update */
} 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
65b3da37 CH	21	extern mempool_t *xfs_ioend_pool;
65b3da37 CH	22
a206c817 CH	23	/*
	24	* Types of I/O for bmap clustering and I/O completion tracking.
	25	*/
	26	enum {
0d882a36 AR	27	XFS_IO_DELALLOC, /* covers delalloc region */
	28	XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */
	29	XFS_IO_OVERWRITE, /* covers already allocated extent */
a206c817 CH	30	};
	31
	32	#define XFS_IO_TYPES \
0d882a36 AR	33	{ XFS_IO_DELALLOC, "delalloc" }, \
	34	{ XFS_IO_UNWRITTEN, "unwritten" }, \
	35	{ XFS_IO_OVERWRITE, "overwrite" }
a206c817	36
f6d6d4fc CH	37	/*
	38	* xfs_ioend struct manages large extent writes for XFS.
	39	* It can manage several multi-page bio's at once.
	40	*/
65b3da37	41	typedef struct xfs_ioend {
f6d6d4fc CH	42	struct xfs_ioend io_list; / next ioend in chain */
f6d6d4fc CH	43	unsigned int io_type; /* delalloc / unwritten */
7d04a335	44	int io_error; /* I/O error code */
65b3da37	45	atomic_t io_remaining; /* hold count */
b677c210	46	struct inode io_inode; / file being written to */
c1a073bd	47	struct buffer_head io_buffer_head;/ buffer linked list head */
f6d6d4fc	48	struct buffer_head io_buffer_tail;/ buffer linked list tail */
65b3da37 CH	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 */
281627df	52	struct xfs_trans io_append_trans;/ xact. for size update */
65b3da37 CH	53	} xfs_ioend_t;
65b3da37 CH	54
f5e54d6e	55	extern const struct address_space_operations xfs_address_space_operations;
c2536668	56	extern int xfs_get_blocks(struct inode , sector_t, struct buffer_head , int);
f6d6d4fc	57
20cb52eb	58	extern void xfs_count_page_state(struct page , int , int *);
0b1b213f	59
ad723875	60	#endif /* __XFS_AOPS_H__ */