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NFSv4.1: Don't deadlock the state manager on the SEQUENCE status flags 

As described in RFC5661, section 18.46, some of the status flags exist
in order to tell the client when it needs to acknowledge the existence of
revoked state on the server and/or to recover state.
Those flags will then remain set until the recovery procedure is done.

In order to avoid looping, the client therefore needs to ignore
those particular flags while recovering.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2016-09-22 13:38:51 -04:00 committed by Anna Schumaker
parent 5690a22d86
commit 0a014a44a5
4 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/nfs4_fs.h
View File

@ -448,7 +448,7 @@ extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool);
extern void nfs41_handle_server_scope(struct nfs_client *,
struct nfs41_server_scope **);
extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);

5
fs/nfs/nfs4proc.c
View File

@ -616,6 +616,7 @@ int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
}
spin_unlock(&tbl->slot_tbl_lock);
slot->privileged = args->sa_privileged ? 1 : 0;
args->sa_slot = slot;
res->sr_slot = slot;
@ -728,7 +729,8 @@ static int nfs41_sequence_process(struct rpc_task *task,
clp = session->clp;
do_renew_lease(clp, res->sr_timestamp);
/* Check sequence flags */
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
!!slot->privileged);
nfs41_update_target_slotid(slot->table, slot, res);
break;
case 1:
@ -875,6 +877,7 @@ int nfs41_setup_sequence(struct nfs4_session *session,
}
spin_unlock(&tbl->slot_tbl_lock);
slot->privileged = args->sa_privileged ? 1 : 0;
args->sa_slot = slot;
dprintk("<-- %s slotid=%u seqid=%u\n", __func__,

1
fs/nfs/nfs4session.h
View File

@ -23,6 +23,7 @@ struct nfs4_slot {
u32 slot_nr;
u32 seq_nr;
unsigned int interrupted : 1,
privileged : 1,
seq_done : 1;
};

12
fs/nfs/nfs4state.c
View File

@ -2227,13 +2227,22 @@ static void nfs41_handle_cb_path_down(struct nfs_client *clp)
nfs4_schedule_state_manager(clp);
}
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags,
bool recovery)
{
if (!flags)
return;
dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n",
__func__, clp->cl_hostname, clp->cl_clientid, flags);
/*
* If we're called from the state manager thread, then assume we're
* already handling the RECLAIM_NEEDED and/or STATE_REVOKED.
* Those flags are expected to remain set until we're done
* recovering (see RFC5661, section 18.46.3).
*/
if (recovery)
goto out_recovery;
if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED)
nfs41_handle_server_reboot(clp);
@ -2246,6 +2255,7 @@ void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags)
nfs4_schedule_lease_moved_recovery(clp);
if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED)
nfs41_handle_recallable_state_revoked(clp);
out_recovery:
if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT)
nfs41_handle_backchannel_fault(clp);
else if (flags & (SEQ4_STATUS_CB_PATH_DOWN |