linux-kernel - Re: [PATCH 0/25] Sysfs cleanups & tagged directory support

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Date:	Wed, 08 Aug 2007 10:37:10 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tejun Heo <teheo@...e.de>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, satyam@...radead.org,
	stern@...land.harvard.edu,
	Linux Containers <containers@...ts.osdl.org>, gregkh@...e.de
Subject: Re: [PATCH 0/25] Sysfs cleanups & tagged directory support

Tejun Heo <teheo@...e.de> writes:

> Hello,
>
> Eric W. Biederman wrote:
>>> More specifically, d_off field.  It's a bit twisted.  For the last
>>> entry, filp->f_pos gets written into the field and gets wrapped while
>>> being copied out to userland or in glibc.
>> 
>> That could do it, and glibc is crunching it.  Oh well, it is
>> easy enough to avoid as long as our inode numbers are small which
>> the idr allocator seems to ensure.
>
> Yeah, now I think about it.  glibc throws out entries which don't fit in
> the data structure specified by the called API, so it probably threw out
> the last entry which has UINT_MAX in d_off which doesn't fit in the
> readdir() return structure.  Using INT_MAX should be just fine as IDA
> always allocates the first empty slot.  We can add paranoia check in ino
> allocation path.

Sounds reasonable.  Annoying but reasonable.

Eric
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