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