fs/bfs/bfs.h

   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 */