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