linux-kernel - Re: [PATCH] ReiserFS: Make sure all dentries refs are released before calling kill_block

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Message-ID: <18698.1155121218@warthog.cambridge.redhat.com>
Date:	Wed, 09 Aug 2006 12:00:18 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	David Howells <dhowells@...hat.com>, torvalds@...l.org,
	akpm@...l.org, linux-kernel@...r.kernel.org,
	reiserfs-dev@...esys.com, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH] ReiserFS: Make sure all dentries refs are released before calling kill_block_super() 

Rafael J. Wysocki <rjw@...k.pl> wrote:

> It didn't apply cleanly to -rc3-mm2 for me and produces the appended oops
> every time at the kernel startup (on x86_64).

Hmmm... It works okay for me, but then I'm testing it on i686, not x86_64.
Should I draw any meaning from you saying "(on x86_64)"?

Also, can you do:

	gdb vmlinux

And then at the prompt, can you disassemble the reiserfs_kill_sb() function:

	disas reiserfs_kill_sb

And send me the disassembly?

If I had to guess, I'd say that REISERFS_SB() returned a NULL pointer, and
that sb->s_root is NULL.  In which case generic_shutdown_super() will not
invoke reiserfs_put_super().

Something that you can try is to modify reiserfs_kill_sb() to be:

	static void reiserfs_kill_sb(struct super_block *s)
	{
		if (REISERFS_SB(s) {
			if (REISERFS_SB(s)->xattr_root) {
				d_invalidate(REISERFS_SB(s)->xattr_root);
				dput(REISERFS_SB(s)->xattr_root);
				REISERFS_SB(s)->xattr_root = NULL;
			}

			if (REISERFS_SB(s)->priv_root) {
				d_invalidate(REISERFS_SB(s)->priv_root);
				dput(REISERFS_SB(s)->priv_root);
				REISERFS_SB(s)->priv_root = NULL;
			}
		}

		kill_block_super(s);
	}

That way the function will be able to kill a superblock that isn't fully
initialised.

David
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