Merge tag 'asoc-v4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound...

[cascardo/linux.git] / fs / nfs / nfs4session.c

diff --git a/fs/nfs/nfs4session.c b/fs/nfs/nfs4session.c
index 332d06e..b629730 100644 (file)
--- a/fs/nfs/nfs4session.c
+++ b/fs/nfs/nfs4session.c
@@ -28,6 +28,7 @@ static void nfs4_init_slot_table(struct nfs4_slot_table *tbl, const char *queue)
        tbl->highest_used_slotid = NFS4_NO_SLOT;
        spin_lock_init(&tbl->slot_tbl_lock);
        rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, queue);
+       init_waitqueue_head(&tbl->slot_waitq);
        init_completion(&tbl->complete);
 }
 
@@ -172,6 +173,58 @@ struct nfs4_slot *nfs4_lookup_slot(struct nfs4_slot_table *tbl, u32 slotid)
        return ERR_PTR(-E2BIG);
 }
 
+static int nfs4_slot_get_seqid(struct nfs4_slot_table  *tbl, u32 slotid,
+               u32 *seq_nr)
+       __must_hold(&tbl->slot_tbl_lock)
+{
+       struct nfs4_slot *slot;
+
+       slot = nfs4_lookup_slot(tbl, slotid);
+       if (IS_ERR(slot))
+               return PTR_ERR(slot);
+       *seq_nr = slot->seq_nr;
+       return 0;
+}
+
+/*
+ * nfs4_slot_seqid_in_use - test if a slot sequence id is still in use
+ *
+ * Given a slot table, slot id and sequence number, determine if the
+ * RPC call in question is still in flight. This function is mainly
+ * intended for use by the callback channel.
+ */
+static bool nfs4_slot_seqid_in_use(struct nfs4_slot_table *tbl,
+               u32 slotid, u32 seq_nr)
+{
+       u32 cur_seq;
+       bool ret = false;
+
+       spin_lock(&tbl->slot_tbl_lock);
+       if (nfs4_slot_get_seqid(tbl, slotid, &cur_seq) == 0 &&
+           cur_seq == seq_nr && test_bit(slotid, tbl->used_slots))
+               ret = true;
+       spin_unlock(&tbl->slot_tbl_lock);
+       return ret;
+}
+
+/*
+ * nfs4_slot_wait_on_seqid - wait until a slot sequence id is complete
+ *
+ * Given a slot table, slot id and sequence number, wait until the
+ * corresponding RPC call completes. This function is mainly
+ * intended for use by the callback channel.
+ */
+int nfs4_slot_wait_on_seqid(struct nfs4_slot_table *tbl,
+               u32 slotid, u32 seq_nr,
+               unsigned long timeout)
+{
+       if (wait_event_timeout(tbl->slot_waitq,
+                       !nfs4_slot_seqid_in_use(tbl, slotid, seq_nr),
+                       timeout) == 0)
+               return -ETIMEDOUT;
+       return 0;
+}
+
 /*
  * nfs4_alloc_slot - efficiently look for a free slot
  *