Root/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
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_NUM_LOCKS
82};
83
84#define ocfs2_iocb_clear_rw_locked(iocb) \
85    clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
86#define ocfs2_iocb_rw_locked_level(iocb) \
87    test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
88#define ocfs2_iocb_set_sem_locked(iocb) \
89    set_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
90#define ocfs2_iocb_clear_sem_locked(iocb) \
91    clear_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
92#define ocfs2_iocb_is_sem_locked(iocb) \
93    test_bit(OCFS2_IOCB_SEM, (unsigned long *)&iocb->private)
94#endif /* OCFS2_FILE_H */
95

Archive Download this file



interactive