linux-kernel - [PATCH/HFS+] fix unlink of links

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Date:	Wed, 9 Apr 2008 17:44:07 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	stable@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH/HFS+] fix unlink of links

Hi,

Some time ago while attempting to handle invalid link counts, I botched 
the unlink of links itself, so this patch fixes this now correctly, so 
that only the link count of nodes that don't point to links is ignored.
Thanks to Vlado Plaga <rechner@...do-do.de> to notify me of this 
problem.

bye, Roman

Signed-off-by: Roman Zippel <zippel@...ux-m68k.org>

Index: linux-2.6/fs/hfsplus/dir.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/dir.c	2008-04-07 14:25:42.000000000 +0200
+++ linux-2.6/fs/hfsplus/dir.c	2008-04-07 15:59:45.000000000 +0200
@@ -340,16 +340,23 @@ static int hfsplus_unlink(struct inode *
 
 	if (inode->i_nlink > 0)
 		drop_nlink(inode);
-	hfsplus_delete_inode(inode);
-	if (inode->i_ino != cnid && !inode->i_nlink) {
-		if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
-			res = hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
-			if (!res)
-				hfsplus_delete_inode(inode);
+	if (inode->i_ino == cnid)
+		clear_nlink(inode);
+	if (!inode->i_nlink) {
+		if (inode->i_ino != cnid) {
+			HFSPLUS_SB(sb).file_count--;
+			if (!atomic_read(&HFSPLUS_I(inode).opencnt)) {
+				res = hfsplus_delete_cat(inode->i_ino,
+							 HFSPLUS_SB(sb).hidden_dir,
+							 NULL);
+				if (!res)
+					hfsplus_delete_inode(inode);
+			} else
+				inode->i_flags |= S_DEAD;
 		} else
-			inode->i_flags |= S_DEAD;
+			hfsplus_delete_inode(inode);
 	} else
-		clear_nlink(inode);
+		HFSPLUS_SB(sb).file_count--;
 	inode->i_ctime = CURRENT_TIME_SEC;
 	mark_inode_dirty(inode);
 
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