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authorAndy Adamson <andros@netapp.com>2009-04-01 09:22:43 -0400
committerBenny Halevy <bhalevy@panasas.com>2009-06-17 12:25:09 -0700
commitb069d94af7785750228287c35f9ce5c463515726 (patch)
tree6528dba606aa13369ff91ff8c23668d995ac5b91
parent4745e3154bf33048d970d1519703089493988f65 (diff)
nfs41: schedule async session reset
Define a new session reset state which is set upon a sequence operation error in both the sync and async error handlers. Place all new requests and all but the last outstanding rpc on the slot_tbl_waitq. Spawn the recovery thread when the last slot is free. Call nfs4_proc_destroy_session, reinitialize the session, call nfs4_proc_create_session, clear the session reset state, and wake up the next task on the slot_tbl_waitq. Return the nfs4_proc_destroy_session status to the session reclaimer and check for NFS4ERR_BADSESSION and NFS4ERR_DEADSESSION. Other destroy session errors should be handled in nfs4_proc_destroy_session where the call can be retried with adjusted arguments. Signed-off-by: Andy Adamson<andros@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> nfs41: make nfs4_wait_bit_killable public] nfs4_wait_bit_killable to be used by NFSv4.1 session recover logic. Signed-off-by: Rahul Iyer <iyer@netapp.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfs41: have create_session work on nfs_client] Signed-off-by: Andy Adamson <andros@netapp.com> [nfs41: trigger the state manager for session reset] Replace the session reset state with the NFS4CLNT_SESSION_SETUP cl_state. Place all rpc tasks to sleep on the slot table waitqueue until the slot table is drained, then schedule state recovery and wait for it to complete. Signed-off-by: Andy Adamson <andros@netapp.com> [nfs41: remove nfs41_session_recovery [ch] Replaced by using the nfs4_state_manager. Signed-off-by: Andy Adamson <andros@netapp.com> [nfs41: nfs4_wait_bit_killable only used locally] [nfs41: keep nfs4_wait_bit_killable static] [nfs41: keep const nfs_server in nfs4_handle_exception] [nfs41: remove session parameter from nfs4_find_slot] Signed-off-by: Andy Adamson <andros@netapp.com Signed-off-by: Benny Halevy <bhalevy@panasas.com> [nfs41: resset the session from nfs41_setup_sequence] 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>
-rw-r--r--fs/nfs/nfs4proc.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ed6c8899806..a2855391b07 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -423,6 +423,22 @@ out:
return ret_id;
}
+static int nfs4_recover_session(struct nfs4_session *session)
+{
+ struct nfs_client *clp = session->clp;
+ int ret;
+
+ for (;;) {
+ ret = nfs4_wait_clnt_recover(clp);
+ if (ret != 0)
+ return ret;
+ if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
+ break;
+ nfs4_schedule_state_manager(clp);
+ }
+ return 0;
+}
+
static int nfs41_setup_sequence(struct nfs4_session *session,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
@@ -431,6 +447,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
{
struct nfs4_slot *slot;
struct nfs4_slot_table *tbl;
+ int status = 0;
u8 slotid;
dprintk("--> %s\n", __func__);
@@ -443,6 +460,23 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
tbl = &session->fc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
+ if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
+ if (tbl->highest_used_slotid != -1) {
+ rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+ spin_unlock(&tbl->slot_tbl_lock);
+ dprintk("<-- %s: Session reset: draining\n", __func__);
+ return -EAGAIN;
+ }
+
+ /* The slot table is empty; start the reset thread */
+ dprintk("%s Session Reset\n", __func__);
+ spin_unlock(&tbl->slot_tbl_lock);
+ status = nfs4_recover_session(session);
+ if (status)
+ return status;
+ spin_lock(&tbl->slot_tbl_lock);
+ }
+
slotid = nfs4_find_slot(tbl, task);
if (slotid == NFS4_MAX_SLOT_TABLE) {
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);