Re: xfs: commit 6552321831dc "xfs: remove i_iolock and use i_rwsem in the VFS inode instead" change causes hang

[Christoph Hellwig]

On Sun, Jan 08, 2017 at 09:48:44AM -0500, Mimi Zohar wrote:
> IMA takes the i_rwsem (fomerly i_mutex) before reading the file to
> synchronize calculating the file hash and validating the file's
> hash/signature stored as security.ima xattr

Well, it shouldn't do that.  In the I/O path i_rwsem is up to the
fs to use.  Various other file systems also take it internally for
reads, although mostly only for direct I/O.

So the answer here is that ima needs to stop playing with i_rwsem.