1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * Copyright (C) 2002, 2004, 2005 Oracle.  All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
20 */
21
22#ifndef OCFS2_AOPS_H
23#define OCFS2_AOPS_H
24
25int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
26			       unsigned from, unsigned to);
27
28handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
29							 struct page *page,
30							 unsigned from,
31							 unsigned to);
32
33int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
34			  struct inode *inode, unsigned int from,
35			  unsigned int to, int new);
36
37int walk_page_buffers(	handle_t *handle,
38			struct buffer_head *head,
39			unsigned from,
40			unsigned to,
41			int *partial,
42			int (*fn)(	handle_t *handle,
43					struct buffer_head *bh));
44
45struct ocfs2_write_ctxt;
46typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
47				u64 *, unsigned int *, unsigned int *);
48
49ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
50				     size_t count, ocfs2_page_writer *actor,
51				     void *priv);
52
53struct ocfs2_write_ctxt {
54	size_t				w_count;
55	loff_t				w_pos;
56	u32				w_cpos;
57	unsigned int			w_finished_copy;
58
59	/* This is true if page_size > cluster_size */
60	unsigned int			w_large_pages;
61
62	/* Filler callback and private data */
63	ocfs2_page_writer		*w_write_data_page;
64	void				*w_private;
65
66	/* Only valid for the filler callback */
67	struct page			*w_this_page;
68	unsigned int			w_this_page_new;
69};
70
71struct ocfs2_buffered_write_priv {
72	char				*b_src_buf;
73	const struct iovec		*b_cur_iov; /* Current iovec */
74	size_t				b_cur_off; /* Offset in the
75						    * current iovec */
76};
77int ocfs2_map_and_write_user_data(struct inode *inode,
78				  struct ocfs2_write_ctxt *wc,
79				  u64 *p_blkno,
80				  unsigned int *ret_from,
81				  unsigned int *ret_to);
82
83struct ocfs2_splice_write_priv {
84	struct splice_desc		*s_sd;
85	struct pipe_buffer		*s_buf;
86	struct pipe_inode_info		*s_pipe;
87	/* Neither offset value is ever larger than one page */
88	unsigned int			s_offset;
89	unsigned int			s_buf_offset;
90};
91int ocfs2_map_and_write_splice_data(struct inode *inode,
92				    struct ocfs2_write_ctxt *wc,
93				    u64 *p_blkno,
94				    unsigned int *ret_from,
95				    unsigned int *ret_to);
96
97/* all ocfs2_dio_end_io()'s fault */
98#define ocfs2_iocb_is_rw_locked(iocb) \
99	test_bit(0, (unsigned long *)&iocb->private)
100static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
101{
102	set_bit(0, (unsigned long *)&iocb->private);
103	if (level)
104		set_bit(1, (unsigned long *)&iocb->private);
105	else
106		clear_bit(1, (unsigned long *)&iocb->private);
107}
108#define ocfs2_iocb_clear_rw_locked(iocb) \
109	clear_bit(0, (unsigned long *)&iocb->private)
110#define ocfs2_iocb_rw_locked_level(iocb) \
111	test_bit(1, (unsigned long *)&iocb->private)
112#endif /* OCFS2_FILE_H */
113