linux-kernel - Re: [PATCH] fs: exFAT read-only driver GPL implementation by Paragon Software.

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Message-ID: <a4c42aa5-f9b7-4e74-2c11-220d45cb3669@redhat.com>
Date:   Mon, 21 Oct 2019 13:37:13 +0200
From:   Maurizio Lombardi <mlombard@...hat.com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
Cc:     "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] fs: exFAT read-only driver GPL implementation by Paragon
 Software.

Dne 21.10.2019 v 13:11 Pali Rohár napsal(a):
> Are you going to add support also for TexFAT? Or at least for more two
> FAT tables (like is used in FAT32)?
> 

Just a small note here, differences between FAT and exFAT:

1) Contiguous files get a special treatment by exFAT: they do not use the FAT cluster chain.
2) exFAT doesn't use the FAT to track free space, it uses a bitmap.

So, 2 FAT tables are probably not sufficient for recovery, 2 bitmaps are needed too.[1]
Btw, only Windows CE supported this.

[1] http://www.ntfs.com/exfat-allocation-bitmap.htm

Maurizio