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NFSv4.0: Re-establish the callback channel on NFS4ERR_CB_PATHDOWN

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When the NFSv4.0 server tells us that it can no-longer talk to us
on the callback channel, we should attempt a new SETCLIENTID in
order to re-transmit the callback channel information.

Note that as long as we do not change the boot verifier, this is
a safe procedure; the server is required to keep our state.

Also move the function nfs_handle_cb_pathdown to fs/nfs/nfs4state.c,
and change the name in order to mark it as being specific to NFSv4.0.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-03-10 11:23:15 -05:00
parent 4fc8796d23
commit ad1e396829
3 changed files with 16 additions and 20 deletions
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17
fs/nfs/delegation.c
View File

@ -453,11 +453,6 @@ static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp,
rcu_read_unlock();
}
static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
{
nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
}
static void nfs_delegation_run_state_manager(struct nfs_client *clp)
{
if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
@ -498,18 +493,6 @@ void nfs_expire_all_delegations(struct nfs_client *clp)
nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
}
/**
* nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
* @clp: client to process
*
*/
void nfs_handle_cb_pathdown(struct nfs_client *clp)
{
if (clp == NULL)
return;
nfs_client_mark_return_all_delegations(clp);
}
static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
{
struct nfs_delegation *delegation;

1
fs/nfs/delegation.h
View File

@ -42,7 +42,6 @@ void nfs_super_return_all_delegations(struct super_block *sb);
void nfs_expire_all_delegations(struct nfs_client *clp);
void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
void nfs_handle_cb_pathdown(struct nfs_client *clp);
int nfs_client_return_marked_delegations(struct nfs_client *clp);
int nfs_delegations_present(struct nfs_client *clp);
void nfs_remove_bad_delegation(struct inode *inode);

18
fs/nfs/nfs4state.c
View File

@ -1097,9 +1097,23 @@ void nfs4_schedule_lease_recovery(struct nfs_client *clp)
}
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery);
/*
* nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
* @clp: client to process
*
* Set the NFS4CLNT_LEASE_EXPIRED state in order to force a
* resend of the SETCLIENTID and hence re-establish the
* callback channel. Then return all existing delegations.
*/
static void nfs40_handle_cb_pathdown(struct nfs_client *clp)
{
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
nfs_expire_all_delegations(clp);
}
void nfs4_schedule_path_down_recovery(struct nfs_client *clp)
{
nfs_handle_cb_pathdown(clp);
nfs40_handle_cb_pathdown(clp);
nfs4_schedule_state_manager(clp);
}
@ -1444,7 +1458,7 @@ static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
case 0:
break;
case -NFS4ERR_CB_PATH_DOWN:
nfs_handle_cb_pathdown(clp);
nfs40_handle_cb_pathdown(clp);
break;
case -NFS4ERR_NO_GRACE:
nfs4_state_end_reclaim_reboot(clp);