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d187715589
Strengthen validation of BFS superblock against corruption. Make in-core inode bitmap static part of superblock info structure. Print a warning when mounting a BFS filesystem created with "-N 512" option as only 510 files can be created in the root directory. Make the kernel messages more uniform. Update the 'prefix' passed to bfs_dump_imap() to match the current naming of operations. White space and comments cleanup. Link: http://lkml.kernel.org/r/CAK+_RLkFZMduoQF36wZFd3zLi-6ZutWKsydjeHFNdtRvZZEb4w@mail.gmail.com Signed-off-by: Tigran Aivazian <aivazian.tigran@gmail.com> Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
68 lines
2 KiB
C
68 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* fs/bfs/bfs.h
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* Copyright (C) 1999-2018 Tigran Aivazian <aivazian.tigran@gmail.com>
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*/
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#ifndef _FS_BFS_BFS_H
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#define _FS_BFS_BFS_H
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#include <linux/bfs_fs.h>
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/* In theory BFS supports up to 512 inodes, numbered from 2 (for /) up to 513 inclusive.
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In actual fact, attempting to create the 512th inode (i.e. inode No. 513 or file No. 511)
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will fail with ENOSPC in bfs_add_entry(): the root directory cannot contain so many entries, counting '..'.
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So, mkfs.bfs(8) should really limit its -N option to 511 and not 512. For now, we just print a warning
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if a filesystem is mounted with such "impossible to fill up" number of inodes */
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#define BFS_MAX_LASTI 513
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/*
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* BFS file system in-core superblock info
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*/
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struct bfs_sb_info {
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unsigned long si_blocks;
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unsigned long si_freeb;
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unsigned long si_freei;
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unsigned long si_lf_eblk;
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unsigned long si_lasti;
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DECLARE_BITMAP(si_imap, BFS_MAX_LASTI+1);
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struct mutex bfs_lock;
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};
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/*
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* BFS file system in-core inode info
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*/
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struct bfs_inode_info {
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unsigned long i_dsk_ino; /* inode number from the disk, can be 0 */
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unsigned long i_sblock;
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unsigned long i_eblock;
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struct inode vfs_inode;
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};
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static inline struct bfs_sb_info *BFS_SB(struct super_block *sb)
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{
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return sb->s_fs_info;
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}
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static inline struct bfs_inode_info *BFS_I(struct inode *inode)
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{
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return container_of(inode, struct bfs_inode_info, vfs_inode);
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}
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#define printf(format, args...) \
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printk(KERN_ERR "BFS-fs: %s(): " format, __func__, ## args)
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/* inode.c */
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extern struct inode *bfs_iget(struct super_block *sb, unsigned long ino);
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extern void bfs_dump_imap(const char *, struct super_block *);
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/* file.c */
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extern const struct inode_operations bfs_file_inops;
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extern const struct file_operations bfs_file_operations;
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extern const struct address_space_operations bfs_aops;
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/* dir.c */
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extern const struct inode_operations bfs_dir_inops;
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extern const struct file_operations bfs_dir_operations;
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#endif /* _FS_BFS_BFS_H */
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