Merge branch 'linux-2.6' into for-2.6.22
[linux-2.6-block.git] / fs / ocfs2 / aops.h
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
25 int ocfs2_prepare_write_nolock(struct inode *inode, struct page *page,
26                                unsigned from, unsigned to);
27
28 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
29                                                          struct page *page,
30                                                          unsigned from,
31                                                          unsigned to);
32
33 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
34                           struct inode *inode, unsigned int from,
35                           unsigned int to, int new);
36
37 int 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
45 struct ocfs2_write_ctxt;
46 typedef int (ocfs2_page_writer)(struct inode *, struct ocfs2_write_ctxt *,
47                                 u64 *, unsigned int *, unsigned int *);
48
49 ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
50                                      size_t count, ocfs2_page_writer *actor,
51                                      void *priv);
52
53 struct 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
71 struct 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 };
77 int 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
83 struct 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 };
91 int 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)
100 static 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 */