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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
25handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
26 struct page *page,
27 unsigned from,
28 unsigned to);
29
30int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
31 struct inode *inode, unsigned int from,
32 unsigned int to, int new);
33
34void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
35
36int walk_page_buffers( handle_t *handle,
37 struct buffer_head *head,
38 unsigned from,
39 unsigned to,
40 int *partial,
41 int (*fn)( handle_t *handle,
42 struct buffer_head *bh));
43
44int ocfs2_write_end_nolock(struct address_space *mapping,
45 loff_t pos, unsigned len, unsigned copied,
46 struct page *page, void *fsdata);
47
48int ocfs2_write_begin_nolock(struct file *filp,
49 struct address_space *mapping,
50 loff_t pos, unsigned len, unsigned flags,
51 struct page **pagep, void **fsdata,
52 struct buffer_head *di_bh, struct page *mmap_page);
53
54int ocfs2_read_inline_data(struct inode *inode, struct page *page,
55 struct buffer_head *di_bh);
56int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
57
58int ocfs2_get_block(struct inode *inode, sector_t iblock,
59 struct buffer_head *bh_result, int create);
60/* all ocfs2_dio_end_io()'s fault */
61#define ocfs2_iocb_is_rw_locked(iocb) \
62 test_bit(0, (unsigned long *)&iocb->private)
63static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
64{
65 set_bit(0, (unsigned long *)&iocb->private);
66 if (level)
67 set_bit(1, (unsigned long *)&iocb->private);
68 else
69 clear_bit(1, (unsigned long *)&iocb->private);
70}
71
72/*
73 * Using a named enum representing lock types in terms of #N bit stored in
74 * iocb->private, which is going to be used for communication between
75 * ocfs2_dio_end_io() and ocfs2_file_aio_write/read().
76 */
77enum ocfs2_iocb_lock_bits {
78 OCFS2_IOCB_RW_LOCK = 0,
79 OCFS2_IOCB_RW_LOCK_LEVEL,
80 OCFS2_IOCB_SEM,
81 OCFS2_IOCB_UNALIGNED_IO,
82 OCFS2_IOCB_NUM_LOCKS
83};
84
85#define ocfs2_iocb_clear_rw_locked(iocb) \
86 clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
87#define ocfs2_iocb_rw_locked_level(iocb) \
88 test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
89#define ocfs2_iocb_set_sem_locked(iocb) \
90 set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
91#define ocfs2_iocb_clear_sem_locked(iocb) \
92 clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
93#define ocfs2_iocb_is_sem_locked(iocb) \
94 test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
95
96#define ocfs2_iocb_set_unaligned_aio(iocb) \
97 set_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
98#define ocfs2_iocb_clear_unaligned_aio(iocb) \
99 clear_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
100#define ocfs2_iocb_is_unaligned_aio(iocb) \
101 test_bit(OCFS2_IOCB_UNALIGNED_IO, (unsigned long *)&iocb->private)
102
103#define OCFS2_IOEND_WQ_HASH_SZ 37
104#define ocfs2_ioend_wq(v) (&ocfs2__ioend_wq[((unsigned long)(v)) %\
105 OCFS2_IOEND_WQ_HASH_SZ])
106extern wait_queue_head_t ocfs2__ioend_wq[OCFS2_IOEND_WQ_HASH_SZ];
107
108#endif /* OCFS2_FILE_H */