fs: Use CHECK_DATA_CORRUPTION() when kernel bugs are detected

Currently, filp_close() and generic_shutdown_super() use printk() to log
messages when bugs are detected. This is problematic because infrastructure
like syzkaller has no idea that this message indicates a bug.
In addition, some people explicitly want their kernels to BUG() when kernel
data corruption has been detected (CONFIG_BUG_ON_DATA_CORRUPTION).
And finally, when generic_shutdown_super() detects remaining inodes on a
system without CONFIG_BUG_ON_DATA_CORRUPTION, it would be nice if later
accesses to a busy inode would at least crash somewhat cleanly rather than
walking through freed memory.

To address all three, use CHECK_DATA_CORRUPTION() when kernel bugs are
detected.

Signed-off-by: Jann Horn <[email protected]>
Reviewed-by: Christian Brauner (Microsoft) <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Christian Brauner (Microsoft) <[email protected]>

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