1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 *	fs/bfs/bfs.h
4 *	Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
5 */
6#ifndef _FS_BFS_BFS_H
7#define _FS_BFS_BFS_H
8
9#include <linux/bfs_fs.h>
10
11/* In theory BFS supports up to 512 inodes, numbered from 2 (for /) up to 513 inclusive.
12   In actual fact, attempting to create the 512th inode (i.e. inode No. 513 or file No. 511)
13   will fail with ENOSPC in bfs_add_entry(): the root directory cannot contain so many entries, counting '..'.
14   So, mkfs.bfs(8) should really limit its -N option to 511 and not 512. For now, we just print a warning
15   if a filesystem is mounted with such "impossible to fill up" number of inodes */
16#define BFS_MAX_LASTI	513
17
18/*
19 * BFS file system in-core superblock info
20 */
21struct bfs_sb_info {
22	unsigned long si_blocks;
23	unsigned long si_freeb;
24	unsigned long si_freei;
25	unsigned long si_lf_eblk;
26	unsigned long si_lasti;
27	DECLARE_BITMAP(si_imap, BFS_MAX_LASTI+1);
28	struct mutex bfs_lock;
29};
30
31/*
32 * BFS file system in-core inode info
33 */
34struct bfs_inode_info {
35	unsigned long i_dsk_ino; /* inode number from the disk, can be 0 */
36	unsigned long i_sblock;
37	unsigned long i_eblock;
38	struct inode vfs_inode;
39};
40
41static inline struct bfs_sb_info *BFS_SB(struct super_block *sb)
42{
43	return sb->s_fs_info;
44}
45
46static inline struct bfs_inode_info *BFS_I(struct inode *inode)
47{
48	return container_of(inode, struct bfs_inode_info, vfs_inode);
49}
50
51
52#define printf(format, args...) \
53	printk(KERN_ERR "BFS-fs: %s(): " format, __func__, ## args)
54
55/* inode.c */
56extern struct inode *bfs_iget(struct super_block *sb, unsigned long ino);
57extern void bfs_dump_imap(const char *, struct super_block *);
58
59/* file.c */
60extern const struct inode_operations bfs_file_inops;
61extern const struct file_operations bfs_file_operations;
62extern const struct address_space_operations bfs_aops;
63
64/* dir.c */
65extern const struct inode_operations bfs_dir_inops;
66extern const struct file_operations bfs_dir_operations;
67
68#endif /* _FS_BFS_BFS_H */
69