linux-kernel - Re: [PATCH v2] udf: fix for pathetic mount times in case of invalid file system

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Date:	Fri, 18 Oct 2013 22:48:04 +0200
From:	Jan Kara <jack@...e.cz>
To:	Péter András Felvégi <petschy@...il.com>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] udf: fix for pathetic mount times in case of invalid
 file system

On Fri 18-10-13 20:07:44, Péter András Felvégi wrote:
> From: Peter A. Felvegi <petschy@...il.com>
> 
> The UDF driver was not strict enough about checking the IDs in the
> VSDs when mounting, which resulted in reading through all the sectors
> of the block device in some unfortunate cases. Eg, trying to mount my
> uninitialized 200G SSD partition (all 0xFF bytes) took ~350 minutes to
> fail, because the code expected some of the valid IDs or a zero byte.
> During this, the mount couldn't be killed, sync from the cmdline
> blocked, and the machine froze into the shutdown. Valid filesystems
> (extX, btrfs, ntfs) were rejected by the mere accident of having a
> zero byte at just the right place in some of their sectors, close
> enough to the beginning not to generate excess I/O. The fix adds a
> hard limit on the VSD sector offset, adds the two missing VSD IDs, and
> stops scanning when encountering an invalid ID. Also replaced the
> magic number 32768 with a more meaningful #define, and supressed the
> bogus message about failing to read the first sector if no UDF fs was
> detected.
  Thanks. I've merged the patch into my tree.

								Honza
> 
> Signed-off-by: Peter A. Felvegi <petschy@...il.com>
> ---
> The fix was developed for 3.9.4, and applies to 3.12-rc3, too.
> 
> patch v2: edited the code so that added/changed lines are not longer than
> 80 chars. sending the patch as an attachment, as gmail messes it up
> otherwise.


-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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