block: introduce bdev_file_inode()
Similar to the file_inode() helper, provide a helper to lookup the inode for a raw block device itself. Cc: Al Viro <viro@zeniv.linux.org.uk> Suggested-by: NJan Kara <jack@suse.cz> Reviewed-by: NJan Kara <jack@suse.cz> Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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