linux-kernel - Re: is the inode an orphan?

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Date:	Mon, 19 Nov 2007 17:02:42 +0200
From:	Artem Bityutskiy <dedekind@...dex.ru>
To:	Jan Kara <jack@...e.cz>
CC:	Al Viro <viro@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: is the inode an orphan?

Hi,

Jan Kara wrote:
>> In our FS when we're in ->unlink() and i_nlink becomes 0, we have to record 
>> this inode in the table of orphans, and remove it from there in 
>> ->delete_inode(). This is needed to be able to dispose of orphans in case 
>> of an unclean reboot on the next mount. AFAIK, ext3 has something similar. 
>> I just figured that this could be optimized - in most cases 
>> ->delete_inode() is called right after ->unlink(), and I wanted to avoid 
>> putting the inode to the orphan table in those cases.
>   Yes, ext3 has something similar. But actually ext3 would have to insert
> inode in the orphan list anyway - in delete_inode we do truncate and
> for it we also insert the inode into the orphan list because truncate
> can be too large to fit into a single transaction.

Ok, thanks for this point.

>   Hmm, I'm just not sure whether unlink cannot somehow race with open
> (at least I don't see any lock that would prevent open while unlink is
> in progress)...

And this.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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