Re: [PATCH] xfs: unlock i_mutex in xfs_break_layouts

[Christoph Hellwig <hch@xxxxxx>]

On Tue, Apr 07, 2015 at 05:07:47PM -0400, J. Bruce Fields wrote:
> On Tue, Apr 07, 2015 at 05:35:44PM +0200, Christoph Hellwig wrote:
> > We want to drop all I/O path locks when recalling layouts, and that includes
> > i_mutex for the write path.  Without this we get stuck processe when recalls
> > take too long.
> 
> Also if the writer is an nfsd thread than we'd rather just error out
> than wait.

We have no way to know we are called by nfsd here unfortunately.