linux-kernel - Re: Linux UDF support

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Date:	Mon, 25 Aug 2014 08:45:13 -0400
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Pali Rohár <pali.rohar@...il.com>,
	Jan Kara <jack@...e.cz>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Linux UDF support

On 2014-08-24 08:46, Pali Rohár wrote:
> Hi,
> 
> I would like to know what is state of linux UDF driver. It is 
> experimental or is now suitable for storing data?
> 
I know that read support works for every version I have tested, but I've
only tested it reading data from DVD's and Blu-Ray discs, so I don't
know how well it works for other purposes.
> According to wikipedia [1] UDF has open specification format and 
> can be used also for HDDs (not only optical discs).
> 
> In OS support table is written that all major and other minor OSs 
> support UDF FS (without needs for additional programs).
> 
> So it looks like UDF is good candidate for multi OS filesystem. 
> Are there any disadvantages for using UDF on e.g USB flash disk? 
> (when I want read/write support on Linux, Windows 7 and Mac OS X)
If you are going to go that way, make sure to use the Spared Build, as
otherwise you will run in to the same media wear-out issues that NTFS
and FAT have.  Also, keep in mind that pre-Vista Windows and pre-10.4
OSX don't have very good support for the newer formats.
> Because lot of manuals say that FAT32 (or NTFS) is only one 
> solution for using USB flash disk on more OS.
> 
> On wikipedia there is one note about linux: Write support is only 
> up to UDF version 2.01. Is this restriction still valid?
I do know that we support reading UDF 2.60 (I've used linux to read
Blu-Ray discs), but I have no idea about write support for versions
above 2.01.
> What will happen if I try to mount FS with UDF version 2.60 in 
> R/W mode on linux? It will fallback to R/O mode? Or newly written 
> files will be in previous (2.01) versions?
> 
> And last question: Is there some fsck tool for UDF? Or at least 
> tool which print if FS is in inconsistent state?
Most Linux distributions have a package called udftools, the upstream
URL given by portage is http://sf.net/projects/linux-udf/
> 
> [1] - http://en.wikipedia.org/wiki/Universal_Disk_Format
> 



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