Message-Id: <5.1.0.14.0.20020103152205.039f2008@mage.qualcomm.com>
Date: Thu, 03 Jan 2002 15:42:20 -0800
To: Alan.Cox@linux.org
From: Vijay Kumar <jkumar@qualcomm.com>
Subject: kernel patch support large fat partitions
Cc: linux-kernel@vger.kernel.org
Mime-Version: 1.0
Content-Type: multipart/mixed;
	boundary="=====================_107777585==_"
Sender: linux-kernel-owner@vger.kernel.org

--=====================_107777585==_
Content-Type: text/plain; charset="us-ascii"; format=flowed

Alan,

This is regarding a change I had to make to the kernel 2.2.17-14 to support 
really large drives. In our project we deal with huge drives, sometimes 
drives larger than 128GB. The file system is FAT32 and only one partition 
is create on any drive. During our testing we realized that linux fat 
implementation doesn't support partitions larger than 128GB(actually 64GB 
because of a bug in fat implementation).

This limitation is imposed by the data structures used by the linux fat 
implementation to read/write directory entries. A 'long' data type is used 
to access directory entries on the disk, of which only 28 bits are used to 
identify the sector that contains the directory entry and the rest 4 bits 
are used to specify offset of the directory entry inside the sector. Using 
28 bits to identify a sector means we cannot access sectors beyond 128GB 
(2^28*512), thus limiting us from creating partitions larger than 128GB on 
large disk drives.

I have made changes to fat, vfat and msdos file system implementations in 
the kernel to use larger data types, thus allowing us to create larger 
partitions. As per the GPL I would like to make the patch available to 
everyone and also in case somebody has run into the same problem(who cares 
about fat in the linux world). The patch has been fairly well tested only 
on our systems(p3, 700MHz with FC). I truly appreciate if you & anybody in 
the kernel mailing list have any feedback about the changes.

The patch is applicable to only 2.2.17-14 kernel and may require changes to 
use with other kernel versions. As far as I know none of the kernel 
versions provide any fix for this problem.

Thanks,
- Vijay
--=====================_107777585==_
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--=====================_107777585==_--

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