linux-kernel - [PATCH] regression: bfs endianness bug

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Message-ID: <20071205083252.GE8181@ftp.linux.org.uk>
Date:	Wed, 5 Dec 2007 08:32:52 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dmitri Vorobiev <dmitri.vorobiev@...il.com>,
	Tigran Aivazian <tigran@...itas.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] regression: bfs endianness bug

BFS_FILEBLOCKS() expects struct bfs_inode * (on-disk data, with little-endian
fields), not struct bfs_inode_info * (in-core stuff, with host-endian ones).
It's a macro and fields with the right names are present in bfs_inode_info,
so it compiles, but on big-endian host it gives bogus results.

Introduced in commit f433dc56344cb72cc3de5ba0819021cec3aef807 (Fixes to the
BFS filesystem driver).

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c
index 294c41b..a64a71d 100644
--- a/fs/bfs/inode.c
+++ b/fs/bfs/inode.c
@@ -178,7 +178,8 @@ static void bfs_delete_inode(struct inode *inode)
 	brelse(bh);
 
         if (bi->i_dsk_ino) {
-		info->si_freeb += BFS_FILEBLOCKS(bi);
+		if (bi->i_sblock)
+			info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
 		info->si_freei++;
 		clear_bit(ino, info->si_imap);
 		dump_imap("delete_inode", s);
--
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