linux-kernel - Re: [git pull] vfs pile 1

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Message-ID: <20120108235338.GR23916@ZenIV.linux.org.uk>
Date:	Sun, 8 Jan 2012 23:53:38 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Miklos Szeredi <mszeredi@...e.cz>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	Toshiyuki Okajima <toshi.okajima@...fujitsu.com>
Subject: Re: [git pull] vfs pile 1

On Sun, Jan 08, 2012 at 11:50:40PM +0000, Al Viro wrote:

> WTF is ext4_symlink() doing in case of long symlinks?  Look:
>                 drop_nlink(inode);
>                 err = ext4_orphan_add(handle, inode);
>                 ext4_journal_stop(handle);
> [write symlink body]
>                 inc_nlink(inode);
>                 err = ext4_orphan_del(handle, inode);
> oh, I see...  The comment above that re deadlocks and inability to do that
> in a single transaction ;-/
> 
> OK, try this; that's equivalent to what they are doing and will not WARN_ON();
> I hadn't checked other filesystems for similar tricks yet, so this has a good
> chance of being incomplete.

... and sure enough, ext3 has the same piece of fun.
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