add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/bfs/bfs.h
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@@ -1,12 +1,19 @@
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 /* 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 Tigran Aivazian <tigran@veritas.com>
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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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+
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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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@@ -17,7 +24,7 @@
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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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-	unsigned long *si_imap;
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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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