1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * Copyright (C) 2002, 2004, 2005 Oracle. All rights reserved.
6 */
7
8 #ifndef OCFS2_AOPS_H
9 #define OCFS2_AOPS_H
10
11 #include <linux/fs.h>
12
13 handle_t *ocfs2_start_walk_page_trans(struct inode *inode,
14 struct page *page,
15 unsigned from,
16 unsigned to);
17
18 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
19 struct inode *inode, unsigned int from,
20 unsigned int to, int new);
21
22 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages);
23
24 int walk_page_buffers( handle_t *handle,
25 struct buffer_head *head,
26 unsigned from,
27 unsigned to,
28 int *partial,
29 int (*fn)( handle_t *handle,
30 struct buffer_head *bh));
31
32 int ocfs2_write_end_nolock(struct address_space *mapping,
33 loff_t pos, unsigned len, unsigned copied, void *fsdata);
34
35 typedef enum {
36 OCFS2_WRITE_BUFFER = 0,
37 OCFS2_WRITE_DIRECT,
38 OCFS2_WRITE_MMAP,
39 } ocfs2_write_type_t;
40
41 int ocfs2_write_begin_nolock(struct address_space *mapping,
42 loff_t pos, unsigned len, ocfs2_write_type_t type,
43 struct page **pagep, void **fsdata,
44 struct buffer_head *di_bh, struct page *mmap_page);
45
46 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
47 struct buffer_head *di_bh);
48 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size);
49
50 int ocfs2_get_block(struct inode *inode, sector_t iblock,
51 struct buffer_head *bh_result, int create);
52 /* all ocfs2_dio_end_io()'s fault */
53 #define ocfs2_iocb_is_rw_locked(iocb) \
54 test_bit(0, (unsigned long *)&iocb->private)
ocfs2_iocb_set_rw_locked(struct kiocb * iocb,int level)55 static inline void ocfs2_iocb_set_rw_locked(struct kiocb *iocb, int level)
56 {
57 set_bit(0, (unsigned long *)&iocb->private);
58 if (level)
59 set_bit(1, (unsigned long *)&iocb->private);
60 else
61 clear_bit(1, (unsigned long *)&iocb->private);
62 }
63
64 /*
65 * Using a named enum representing lock types in terms of #N bit stored in
66 * iocb->private, which is going to be used for communication between
67 * ocfs2_dio_end_io() and ocfs2_file_write/read_iter().
68 */
69 enum ocfs2_iocb_lock_bits {
70 OCFS2_IOCB_RW_LOCK = 0,
71 OCFS2_IOCB_RW_LOCK_LEVEL,
72 OCFS2_IOCB_NUM_LOCKS
73 };
74
75 #define ocfs2_iocb_clear_rw_locked(iocb) \
76 clear_bit(OCFS2_IOCB_RW_LOCK, (unsigned long *)&iocb->private)
77 #define ocfs2_iocb_rw_locked_level(iocb) \
78 test_bit(OCFS2_IOCB_RW_LOCK_LEVEL, (unsigned long *)&iocb->private)
79
80 #endif /* OCFS2_FILE_H */
81