linux-kernel - Re: [PATCH] fs: don't remove inotify watchers from alive inode-s

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Message-ID: <20140908121956.GY16395@moon>
Date:	Mon, 8 Sep 2014 16:19:56 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrey Vagin <avagin@...nvz.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	John McCutchan <john@...nmccutchan.com>,
	Robert Love <rlove@...ve.org>,
	Eric Paris <eparis@...isplace.org>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: [PATCH] fs: don't remove inotify watchers from alive inode-s

On Mon, Sep 08, 2014 at 04:01:56PM +0400, Andrey Vagin wrote:
> Currently watchers are removed in dentry_iput(), if n_link is zero.
> But other detries can be linked with this inode. For example if we
> create two hard links, open the first one and set a watcher on the
> second one. Then if we remove both links, the watcher will be removed.
> But we will have the alive file descriptor, which allows us to generate
> more events.
> 
> With this patch, watchers will be removed, only if nlink is zero and
> i_dentry list is empty.

This changes the sequence of notifies userspace will see but I think there
were a bug before this patch, so

Reviewed-by: Cyrill Gorcunov <gorcunov@...nvz.org>
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