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Date:   Sun, 8 Jan 2017 15:52:00 +0100
From:   Christoph Hellwig <>
To:     Mimi Zohar <>
Cc:, Christoph Hellwig <>,
        Dave Chinner <>,
        linux-fsdevel <>,
        linux-kernel <>,
        Al Viro <>
Subject: Re: xfs:  commit 6552321831dc "xfs: remove i_iolock and use
        i_rwsem in the VFS inode instead"  change causes hang

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.

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