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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>
This commit is contained in:
Andy Adamson 2009-04-01 09:22:43 -04:00 committed by Benny Halevy
parent 4745e3154b
commit b069d94af7
1 changed files with 34 additions and 0 deletions
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34
fs/nfs/nfs4proc.c
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@ -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);