NFSv4.1: Support dynamic resizing of the session slot table
Allow the server to control the size of the session slot table
by adjusting the value of sr_target_max_slots in the reply to the
SEQUENCE operation.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 62212231..1792ece 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -492,10 +492,17 @@
static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
u32 target_highest_slotid)
{
+ unsigned int max_slotid, i;
+
if (tbl->target_highest_slotid == target_highest_slotid)
return;
tbl->target_highest_slotid = target_highest_slotid;
tbl->generation++;
+
+ max_slotid = min(tbl->max_slots - 1, tbl->target_highest_slotid);
+ for (i = tbl->max_slotid + 1; i <= max_slotid; i++)
+ rpc_wake_up_next(&tbl->slot_tbl_waitq);
+ tbl->max_slotid = max_slotid;
}
void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
@@ -622,8 +629,8 @@
dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid,
tbl->max_slots);
- slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
- if (slotid >= tbl->max_slots)
+ slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1);
+ if (slotid > tbl->max_slotid)
goto out;
__set_bit(slotid, tbl->used_slots);
if (slotid > tbl->highest_used_slotid ||
@@ -5744,6 +5751,7 @@
tbl->highest_used_slotid = NFS4_NO_SLOT;
tbl->target_highest_slotid = max_slots - 1;
tbl->server_highest_slotid = max_slots - 1;
+ tbl->max_slotid = max_slots - 1;
for (i = 0; i < tbl->max_slots; i++)
tbl->slots[i].seq_nr = ivalue;
spin_unlock(&tbl->slot_tbl_lock);