From: Andy Adamson <andros@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[nfs41: have create_session work on nfs_client]
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[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@xxxxxxxxxx>
[nfs41: remove nfs41_session_recovery [ch]
Replaced by using the nfs4_state_manager.
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
[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@xxxxxxxxxx
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[nfs41: resset the session from nfs41_setup_sequence]
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 34 ++++++++++++++++++++++++++++++++++
1 files changed, 34 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index a9c5b00..3b3d1df 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);
--
1.6.2.1
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