nfs41: implement cb_recall_slot
Drain the fore channel and reset the max_slots to the new value.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 8406cac..9164758 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1249,6 +1249,12 @@
}
#ifdef CONFIG_NFS_V4_1
+void nfs41_handle_recall_slot(struct nfs_client *clp)
+{
+ set_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state);
+ nfs4_schedule_state_recovery(clp);
+}
+
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
{
if (!flags)
@@ -1299,9 +1305,38 @@
return status;
}
+static int nfs4_recall_slot(struct nfs_client *clp)
+{
+ struct nfs4_slot_table *fc_tbl = &clp->cl_session->fc_slot_table;
+ struct nfs4_channel_attrs *fc_attrs = &clp->cl_session->fc_attrs;
+ struct nfs4_slot *new, *old;
+ int i;
+
+ nfs4_begin_drain_session(clp);
+ new = kmalloc(fc_tbl->target_max_slots * sizeof(struct nfs4_slot),
+ GFP_KERNEL);
+ if (!new)
+ return -ENOMEM;
+
+ spin_lock(&fc_tbl->slot_tbl_lock);
+ for (i = 0; i < fc_tbl->target_max_slots; i++)
+ new[i].seq_nr = fc_tbl->slots[i].seq_nr;
+ old = fc_tbl->slots;
+ fc_tbl->slots = new;
+ fc_tbl->max_slots = fc_tbl->target_max_slots;
+ fc_tbl->target_max_slots = 0;
+ fc_attrs->max_reqs = fc_tbl->max_slots;
+ spin_unlock(&fc_tbl->slot_tbl_lock);
+
+ kfree(old);
+ nfs4_end_drain_session(clp);
+ return 0;
+}
+
#else /* CONFIG_NFS_V4_1 */
static int nfs4_reset_session(struct nfs_client *clp) { return 0; }
static int nfs4_end_drain_session(struct nfs_client *clp) { return 0; }
+static int nfs4_recall_slot(struct nfs_client *clp) { return 0; }
#endif /* CONFIG_NFS_V4_1 */
/* Set NFS4CLNT_LEASE_EXPIRED for all v4.0 errors and for recoverable errors
@@ -1398,6 +1433,15 @@
nfs_client_return_marked_delegations(clp);
continue;
}
+ /* Recall session slots */
+ if (test_and_clear_bit(NFS4CLNT_RECALL_SLOT, &clp->cl_state)
+ && nfs4_has_session(clp)) {
+ status = nfs4_recall_slot(clp);
+ if (status < 0)
+ goto out_error;
+ continue;
+ }
+
nfs4_clear_state_manager_bit(clp);
/* Did we race with an attempt to give us more work? */