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nfs41: nfs41: fix state manager deadlock in session reset

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If the session is reset during state recovery, the state manager thread can
sleep on the slot_tbl_waitq causing a deadlock.

Add a completion framework to the session.  Have the state manager thread set
a new session state (NFS4CLNT_SESSION_DRAINING) and wait for the session slot
table to drain.

Signal the state manager thread in nfs41_sequence_free_slot when the
NFS4CLNT_SESSION_DRAINING bit is set and the session is drained.

Reported-by: Trond Myklebust <trond@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2009-12-04 15:55:38 -05:00 • committed by Trond Myklebust
parent 05f0d23647
commit ea028ac925
4 changed files with 34 additions and 9 deletions
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15
fs/nfs/nfs4state.c
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@ -1181,8 +1181,23 @@ static void nfs4_session_recovery_handle_error(struct nfs_client *clp, int err)
static int nfs4_reset_session(struct nfs_client *clp)
{
struct nfs4_session *ses = clp->cl_session;
struct nfs4_slot_table *tbl = &ses->fc_slot_table;
int status;
INIT_COMPLETION(ses->complete);
spin_lock(&tbl->slot_tbl_lock);
if (tbl->highest_used_slotid != -1) {
set_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
spin_unlock(&tbl->slot_tbl_lock);
status = wait_for_completion_interruptible(&ses->complete);
clear_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state);
if (status) /* -ERESTARTSYS */
goto out;
} else {
spin_unlock(&tbl->slot_tbl_lock);
}
status = nfs4_proc_destroy_session(clp->cl_session);
if (status && status != -NFS4ERR_BADSESSION &&
status != -NFS4ERR_DEADSESSION) {