From: Jon Jagger <jon@jaggersoft.com>
Date: Tue, 28 Feb 2012 20:43:21 GMT
Subject: Re: git (commit|tag) atomicity
Message-ID: <CADWOt=iz91AjBbkrc6cJqSqadyP9nDqBg92j0qDwBmHxkSUqZg@mail.gmail.com>
In-Reply-To: <4F4D2391.9020701@zabbo.net>

On Tue, Feb 28, 2012 at 6:57 PM, Zach Brown <zab@zabbo.net> wrote:
>
> It's a bit of a tangent, but just to be sure people don't get the wrong
> impression..
>
>
>> But I am not sure... that probably depends on how opendir(3) and
>> readdir(3) works on given filesystem wrt. updates to opened directory.
>> I think VFS on Linux ensures that you see view of filesystem as it was
>> on opendir().
>
>
> No, readdir() does not give you a static view of the entries in a
> directory as it was on opendir().  readdir() will reflect modifications
> that are done after opendir().  The specifics for a given situation
> depend on how the file system maps the readdir position (f_pos) to
> directory entries.  You can see very different results when comparing,
> say, stock ext2, indexed ext[34], and btrfs.

Ok. Thanks.