file_inode() vs f_mapping->host

[Andre Richter]

Hi all,

in this thread ( https://lkml.org/lkml/2013/3/17/128 ), Al Viro argues
that file_inode() is not equal to f_mapping->host in certain cases.

I'm asking, because in arch/x86/kernel/msr.c, msr_seek() retrieves the
inode via f_mapping while one function later, msr_read() uses
file_inode().
Is this on purpose?

In general, how do I distinguish when to use what?

Thanks in advance,
Andre
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