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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-11-20 14:45:48 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-12-06 00:30:42 +0100
commit97e548a93de213b149eea025a97d88e28143b445 (patch)
tree7536bccb32193adf105bc1ede6462d6482589f4e /fs/nfs
parent1b285ff16ab52fb401aed7ce70abed4bb65b30b5 (diff)
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>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4proc.c12
-rw-r--r--fs/nfs/nfs4state.c6
2 files changed, 13 insertions, 5 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 62212231ce62..1792ece8b53c 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -492,10 +492,17 @@ static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
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 @@ static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
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 @@ static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
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);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 842cb8c2f65d..1b7fa73c9436 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -254,15 +254,14 @@ static void nfs4_end_drain_session(struct nfs_client *clp)
{
struct nfs4_session *ses = clp->cl_session;
struct nfs4_slot_table *tbl;
- int max_slots;
+ unsigned int i;
if (ses == NULL)
return;
tbl = &ses->fc_slot_table;
if (test_and_clear_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
spin_lock(&tbl->slot_tbl_lock);
- max_slots = tbl->max_slots;
- while (max_slots--) {
+ for (i = 0; i <= tbl->max_slotid; i++) {
if (rpc_wake_up_first(&tbl->slot_tbl_waitq,
nfs4_set_task_privileged,
NULL) == NULL)
@@ -2043,6 +2042,7 @@ static int nfs4_recall_slot(struct nfs_client *clp)
old = fc_tbl->slots;
fc_tbl->slots = new;
fc_tbl->max_slots = fc_tbl->target_highest_slotid + 1;
+ fc_tbl->max_slotid = fc_tbl->target_highest_slotid;
clp->cl_session->fc_attrs.max_reqs = fc_tbl->max_slots;
spin_unlock(&fc_tbl->slot_tbl_lock);