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 | |
41 | static inline struct bfs_sb_info *BFS_SB(struct super_block *sb) |
42 | { |
43 | return sb->s_fs_info; |
44 | } |
45 | |
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 | |