linux-kernel - Re: [PATCH 2/2] Fix possible leakage of blocks in UDF

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Date:	Wed, 30 May 2007 16:46:28 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Jan Kara <jack@...e.cz>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: [PATCH 2/2] Fix possible leakage of blocks in UDF

Jan Kara wrote:
>   Hello,
> 
> On Thu 24-05-07 19:05:54, Jan Kara wrote:
>>   Hello,
>>
>>   attached is a patch that fixes possible leakage of free blocks / use of
>> free blocks in UDF (which spilled nice assertion failures I've added in my
>> first round of patches). More details in the changelog. Andrew, please apply.
>> Both changes have survived some time of fsx and fsstress testing so they
>> should be reasonably safe.
>   Sorry for replying to myself but this patch had a minor problem of
> printing some bogus warnings when directories were deleted (I wonder why
> fsstress didn't find it). Attached is a new version of the patch without
> this problem.

Jan, something seems busted here.  I'm getting lockups when testing udf
on a single cpu with this last patch in place...

I think it's the BKL stumbling on itself.

for example...

static int udf_symlink(struct inode * dir, struct dentry * dentry, const
char * symname)
{
...
        lock_kernel();
...
out:
        unlock_kernel();
        return err;

out_no_entry:
        inode_dec_link_count(inode);
        iput(inode);
        goto out;
}

but iput goes
iput->iput_final->drop_inode->udf_drop_inode->lock_kernel() again

looking for the right way around it but figured I'd ping you early :)

-Eric
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