xref: /linux/fs/bfs/bfs.h (revision 597473720f4dc69749542bfcfed4a927a43d935e)
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