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