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Date:      Sat, 8 Jul 2006 18:46:06 +0100
From:      Christoph Hellwig <hch@infradead.org>
To:        Sam Leffler <sam@errno.com>
Cc:        Craig Rodrigues <rodrigc@crodrigues.org>, freebsd-current@freebsd.org, freebsd-arch@freebsd.org
Subject:   Re: [RFC] mount can figure out fstype automatically
Message-ID:  <20060708174606.GA29602@infradead.org>
In-Reply-To: <44AFD7DF.8090002@errno.com>
References:  <20060708152801.GA3671@crodrigues.org> <44AFD7DF.8090002@errno.com>

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On Sat, Jul 08, 2006 at 09:05:51AM -0700, Sam Leffler wrote:
> Linux has -t auto; haven't looked at how it works.

It's implemented in mount(8).  It has a table of magic numbers and offsets
and tries all of them in a well defined order.  If everything fails it
tries a few heuristics whether the filesystems might be a FAT filesystem
as thos don't have magic numbers.




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