[PATCH v2] xfs: check magic numbers in dir3 leaf verifier first

[Ben Myers]

On Tue, Sep 03, 2013 at 10:06:58AM +1000, Dave Chinner wrote:
> xfs: check magic numbers in dir3 leaf verifier first
> 
> From: Dave Chinner <dchinner at redhat.com>
> 
> Calling xfs_dir3_leaf_hdr_from_disk() in a verifier before
> validating the magic numbers in the buffer results in ASSERT
> failures due to mismatching magic numbers when a corruption occurs.
> Seeing as the verifier is supposed to catch the corruption and pass
> it back to the caller, having the verifier assert fail on error
> defeats the purpose of detecting the errors in the first place.
> 
> Check the magic numbers direct from the buffer before decoding the
> header.
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>

Cleaned up the spurious newline and applied.