do_generic_mapping_read abuse in gfs2

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I was looking into cleaning up the the read actor mess now that sendfile
uses splice and notices gfs2 now uses do_generic_mapping_read.

The use is rather odd because it's used for reading small structures
from kernelspace and thus doesn't actually needs the fullblown
do_generic_mapping_read at all.  Any chance you could switch it to
a simple read_cache_page() so we can kill do_generic_mapping_read?
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