From: Zach Brown <zab@zabbo.net>
To: Jakub Narebski <jnareb@gmail.com>
Cc: Jon Jagger <jon@jaggersoft.com>,
git@vger.kernel.org, Holger Hellmuth <hellmuth@ira.uka.de>
Subject: Re: git (commit|tag) atomicity
Date: Tue, 28 Feb 2012 13:57:21 -0500 [thread overview]
Message-ID: <4F4D2391.9020701@zabbo.net> (raw)
In-Reply-To: <m3aa42vosb.fsf@localhost.localdomain>
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.
- z
(your message probably caught my eye because telldir()/seekdir() is
*loathed* by file system designers)
next prev parent reply other threads:[~2012-02-28 19:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 15:40 git (commit|tag) atomicity Jon Jagger
2012-02-28 16:46 ` Holger Hellmuth
2012-02-28 17:12 ` Jon Jagger
2012-02-28 17:41 ` Jakub Narebski
2012-02-28 18:57 ` Zach Brown [this message]
2012-02-28 20:43 ` Jon Jagger
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