Hi Christoph,

there's an assertion that the inode rwsem is taken in iomap_dio_rw
which currently triggers on gfs2 via gfs2_file_read_iter ->
gfs2_file_direct_read -> iomap_dio_rw in fs/gfs2/file.c.

We're not using inode_[un]lock_shared on that code path because gfs2
uses its own cluster-wide locking already. Is there a reason why the
inode needs to be locked locally anyway? If not, I'd like to avoid
adding unnecessary lock taking in gfs2_file_direct_read just to
silence iomap_dio_rw.


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