nfs41: reset the session slot table

Separated from nfs41: schedule async session reset

Do not kfree the session slot table upon session reset, just re-initialize it.
Add a boolean to nfs4_proc_create_session to inidicate if this is a
session reset or a session initialization.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 17768095f0ccdf4f6972f4d32a402c4ea28cfae6..0b121474024832553280ad7e25893827b11f2fd1 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4289,6 +4289,37 @@ int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
        return status;
 }
 
+/* Reset a slot table */
+static int nfs4_reset_slot_table(struct nfs4_session *session)
+{
+       struct nfs4_slot_table *tbl = &session->fc_slot_table;
+       int i, max_slots = session->fc_attrs.max_reqs;
+       int old_max_slots = session->fc_slot_table.max_slots;
+       int ret = 0;
+
+       dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__,
+               session->fc_attrs.max_reqs, tbl);
+
+       /* Until we have dynamic slot table adjustment, insist
+        * upon the same slot table size */
+       if (max_slots != old_max_slots) {
+               dprintk("%s reset slot table does't match old\n",
+                       __func__);
+               ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
+               goto out;
+       }
+       spin_lock(&tbl->slot_tbl_lock);
+       for (i = 0; i < max_slots; ++i)
+               tbl->slots[i].seq_nr = 1;
+       tbl->highest_used_slotid = -1;
+       spin_unlock(&tbl->slot_tbl_lock);
+       dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
+               tbl, tbl->slots, tbl->max_slots);
+out:
+       dprintk("<-- %s: return %d\n", __func__, ret);
+       return ret;
+}
+
 /*
  * Initialize slot table
  */
@@ -4497,7 +4528,7 @@ static int _nfs4_proc_create_session(struct nfs_client *clp)
  * It is the responsibility of the caller to verify the session is
  * expired before calling this routine.
  */
-int nfs4_proc_create_session(struct nfs_client *clp)
+int nfs4_proc_create_session(struct nfs_client *clp, int reset)
 {
        int status;
        unsigned *ptr;
@@ -4510,8 +4541,11 @@ int nfs4_proc_create_session(struct nfs_client *clp)
        if (status)
                goto out;
 
-       /* Init the fore channel */
-       status = nfs4_init_slot_table(session);
+       /* Init or reset the fore channel */
+       if (reset)
+               status = nfs4_reset_slot_table(session);
+       else
+               status = nfs4_init_slot_table(session);
        dprintk("fore channel slot table initialization returned %d\n", status);
        if (status)
                goto out;
@@ -4520,6 +4554,10 @@ int nfs4_proc_create_session(struct nfs_client *clp)
        dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
                clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
 
+       if (reset)
+               /* Lease time is aleady set */
+               goto out;
+
        /* Get the lease time */
        status = nfs4_proc_get_lease_time(clp, &fsinfo);
        if (status == 0) {