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 */
21 struct 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 */
34 struct 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
BFS_SB(struct super_block * sb)41 static inline struct bfs_sb_info *BFS_SB(struct super_block *sb)
42 {
43 return sb->s_fs_info;
44 }
45
BFS_I(struct inode * inode)46 static 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 */
56 extern struct inode *bfs_iget(struct super_block *sb, unsigned long ino);
57 extern void bfs_dump_imap(const char *, struct super_block *);
58
59 /* file.c */
60 extern const struct inode_operations bfs_file_inops;
61 extern const struct file_operations bfs_file_operations;
62 extern const struct address_space_operations bfs_aops;
63
64 /* dir.c */
65 extern const struct inode_operations bfs_dir_inops;
66 extern const struct file_operations bfs_dir_operations;
67
68 #endif /* _FS_BFS_BFS_H */
69