Linux Kernel readlink equivalent

[David Legault]

Hello,

I'm working on some linux kernel driver stuff and I have a fake path called
/dev/blah/whatever that points to /dev/block/real_device.

The issue is that lookup_bdev will fail to follow the symlink so I'd like
to massage the path upfront by getting the real path
(/dev/block/real_device) so I can hand that off to lookup_bdev so it
returns successfully instead of an error.

Or any other kernel call that would correctly retrieve the block_device
information given the initial path which is a symlink.

Note: I saw that the tomoyo module has something like that but I was
looking for the generic implementation of the kernel if one exists.

Thanks

David
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