FS-Cache: Annotate slow-work runqueue proc lines for FS-Cache work items

Annotate slow-work runqueue proc lines for FS-Cache work items.  Objects
include the object ID and the state.  Operations include the object ID, the
operation ID and the operation type and state.

Signed-off-by: David Howells <dhowells@redhat.com>

diff --cc fs/fscache/object.c
Simple merge

diff --cc fs/fscache/operation.c
Simple merge

diff --cc fs/fscache/page.c
Simple merge

diff --cc include/linux/fscache-cache.h
Simple merge