nfsd: add support for freeing unused session-DRC slots

Reducing the number of slots in the session slot table requires
confirmation from the client.  This patch adds reduce_session_slots()
which starts the process of getting confirmation, but never calls it.
That will come in a later patch.

Before we can free a slot we need to confirm that the client won't try
to use it again.  This involves returning a lower cr_maxrequests in a
SEQUENCE reply and then seeing a ca_maxrequests on the same slot which
is not larger than we limit we are trying to impose.  So for each slot
we need to remember that we have sent a reduced cr_maxrequests.

To achieve this we introduce a concept of request "generations".  Each
time we decide to reduce cr_maxrequests we increment the generation
number, and record this when we return the lower cr_maxrequests to the
client.  When a slot with the current generation reports a low
ca_maxrequests, we commit to that level and free extra slots.

We use an 16 bit generation number (64 seems wasteful) and if it cycles
we iterate all slots and reset the generation number to avoid false matches.

When we free a slot we store the seqid in the slot pointer so that it can
be restored when we reactivate the slot.  The RFC can be read as
suggesting that the slot number could restart from one after a slot is
retired and reactivated, but also suggests that retiring slots is not
required.  So when we reactive a slot we accept with the next seqid in
sequence, or 1.

When decoding sa_highest_slotid into maxslots we need to add 1 - this
matches how it is encoded for the reply.

se_dead is moved in struct nfsd4_session to remove a hole.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 382cc1389396..c26ba86dbdfd 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -576,9 +576,7 @@ struct nfsd4_sequence {
 	u32			slotid;			/* request/response */
 	u32			maxslots;		/* request/response */
 	u32			cachethis;		/* request */
-#if 0
 	u32			target_maxslots;	/* response */
-#endif /* not yet */
 	u32			status_flags;		/* response */
 };