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Re: readdir and d_ino set to 0

From: Eric Blake <ebb9 at byu dot net>
To: Eric Norum <norume at aps dot anl dot gov>
Cc: Chris Johns <chrisj at rtems dot org>, newlib at sourceware dot org
Date: Thu, 03 Sep 2009 19:26:27 -0600
Subject: Re: readdir and d_ino set to 0
References: <4AA05AC5.4040603@rtems.org> <F62D0A9C-0837-4349-A2B8-7D57C42D6D00@aps.anl.gov>

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According to Eric Norum on 9/3/2009 7:00 PM:
> If I recall my Unix V7 code correctly, I think that inode 0 was reserved
> for holding a list of bad blocks.  Of course if your disk had a bad
> block that was *in* the inode table you were pretty much out of luck.....

Also, modern-day BSD union mounts read all the entries from several layers
of directories, sort them, then discard duplicate names by changing d_ino
to 0.  In other words, there are still live systems where readdir returns
such dead entries.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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Follow-Ups:
- Re: readdir and d_ino set to 0
  - From: Chris Johns

References:
- readdir and d_ino set to 0
  - From: Chris Johns
- Re: readdir and d_ino set to 0
  - From: Eric Norum

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