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aops.h
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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 
25 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
26  struct page *page,
27  unsigned from,
28  unsigned to);
29 
30 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
31  struct inode *inode, unsigned int from,
32  unsigned int to, int new);
33 
35 
36 int 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 
45  loff_t pos, unsigned len, unsigned copied,
46  struct page *page, void *fsdata);
47 
48 int 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 
54 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
55  struct buffer_head *di_bh);
56 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
57 
58 int 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)
63 static 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  */
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])
107 
108 #endif /* OCFS2_FILE_H */