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H A Dnfs.c37d1e4d9 Wed Feb 22 18:07:24 GMT 2017 Paolo Bonzini <pbonzini@redhat.com> nfs: do not use aio_context_acquire/release

Now that all bottom halves and callbacks take care of taking the
AioContext lock, we can migrate some users away from it and to a
specific QemuMutex or CoMutex.

Protect libnfs calls with a QemuMutex. Callbacks are invoked
using bottom halves, so we don't even have to drop it around
callback invocations.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20170222180725.28611-3-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>