linux-kernel - Re: Linux 2.6.26-rc4

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Date:	Tue, 3 Jun 2008 20:18:59 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Ian Kent <raven@...maw.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Miklos Szeredi <miklos@...redi.hu>, jesper@...gh.cc,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Linux 2.6.26-rc4

On Tue, Jun 03, 2008 at 01:46:41PM -0400, Jeff Moyer wrote:

> Well, let me know what level of dump you'd like.  I can give the 50,000
> foot view, or I can give you the history of things that happened to get
> us to where we are today, or anything inbetween.  The more specific
> your request, the quicker I can respond.  A full brain-dump would take
> some time!

a) what the hell is going on in autofs4_free_ino()?  It checks for
ino->dentry, when the only caller has just set it to NULL.

b) while we are at it, what's ino->inode doing there?  AFAICS, it's
a write-only field...

c) what are possible states of autofs4 dentry and what's the supposed
life cycle of these beasts?

d)
/* For dentries of directories in the root dir */
static struct dentry_operations autofs4_root_dentry_operations = {
        .d_revalidate   = autofs4_revalidate,
        .d_release      = autofs4_dentry_release,
};

/* For other dentries */
static struct dentry_operations autofs4_dentry_operations = {
        .d_revalidate   = autofs4_revalidate,
        .d_release      = autofs4_dentry_release,
};

Just what is the difference?

e) in autofs4_tree_busy() we do atomic_read() on ino->count and dentry->d_count
What's going to keep these suckers consistent with each other in any useful
way?
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