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nfsd: New helper nfsd4_cb_sequence_done() for processing more cb errors 

According to Christoph's advice, this patch introduce a new helper
nfsd4_cb_sequence_done() for processing more callback errors, following
the example of the client's nfs41_sequence_done().

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Kinglong Mee 2015-06-24 16:33:37 +08:00 committed by J. Bruce Fields
parent 9056fff3d5
commit 7ba6cad6c8
2 changed files with 93 additions and 41 deletions
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132
fs/nfsd/nfs4callback.c
View File

@ -435,12 +435,12 @@ static int decode_cb_sequence4resok(struct xdr_stream *xdr,
*/
status = 0;
out:
if (status)
nfsd4_mark_cb_fault(cb->cb_clp, status);
cb->cb_seq_status = status;
return status;
out_overflow:
print_overflow_msg(__func__, xdr);
return -EIO;
status = -EIO;
goto out;
}
static int decode_cb_sequence4res(struct xdr_stream *xdr,
@ -451,11 +451,10 @@ static int decode_cb_sequence4res(struct xdr_stream *xdr,
if (cb->cb_minorversion == 0)
return 0;
status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_status);
if (unlikely(status || cb->cb_status))
status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status);
if (unlikely(status || cb->cb_seq_status))
return status;
cb->cb_update_seq_nr = true;
return decode_cb_sequence4resok(xdr, cb);
}
@ -527,7 +526,7 @@ static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
if (cb != NULL) {
status = decode_cb_sequence4res(xdr, cb);
if (unlikely(status || cb->cb_status))
if (unlikely(status || cb->cb_seq_status))
return status;
}
@ -617,7 +616,7 @@ static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp,
if (cb) {
status = decode_cb_sequence4res(xdr, cb);
if (unlikely(status || cb->cb_status))
if (unlikely(status || cb->cb_seq_status))
return status;
}
return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status);
@ -876,7 +875,11 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
u32 minorversion = clp->cl_minorversion;
cb->cb_minorversion = minorversion;
cb->cb_update_seq_nr = false;
/*
* cb_seq_status is only set in decode_cb_sequence4res,
* and so will remain 1 if an rpc level failure occurs.
*/
cb->cb_seq_status = 1;
cb->cb_status = 0;
if (minorversion) {
if (!nfsd41_cb_get_slot(clp, task))
@ -885,6 +888,84 @@ static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
rpc_call_start(task);
}
static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb)
{
struct nfs4_client *clp = cb->cb_clp;
struct nfsd4_session *session = clp->cl_cb_session;
bool ret = true;
if (!clp->cl_minorversion) {
/*
* If the backchannel connection was shut down while this
* task was queued, we need to resubmit it after setting up
* a new backchannel connection.
*
* Note that if we lost our callback connection permanently
* the submission code will error out, so we don't need to
* handle that case here.
*/
if (task->tk_flags & RPC_TASK_KILLED)
goto need_restart;
return true;
}
switch (cb->cb_seq_status) {
case 0:
/*
* No need for lock, access serialized in nfsd4_cb_prepare
*
* RFC5661 20.9.3
* If CB_SEQUENCE returns an error, then the state of the slot
* (sequence ID, cached reply) MUST NOT change.
*/
++session->se_cb_seq_nr;
break;
case -ESERVERFAULT:
++session->se_cb_seq_nr;
case 1:
case -NFS4ERR_BADSESSION:
nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status);
ret = false;
break;
case -NFS4ERR_DELAY:
if (!rpc_restart_call(task))
goto out;
rpc_delay(task, 2 * HZ);
return false;
case -NFS4ERR_BADSLOT:
goto retry_nowait;
case -NFS4ERR_SEQ_MISORDERED:
if (session->se_cb_seq_nr != 1) {
session->se_cb_seq_nr = 1;
goto retry_nowait;
}
break;
default:
dprintk("%s: unprocessed error %d\n", __func__,
cb->cb_seq_status);
}
clear_bit(0, &clp->cl_cb_slot_busy);
rpc_wake_up_next(&clp->cl_cb_waitq);
dprintk("%s: freed slot, new seqid=%d\n", __func__,
clp->cl_cb_session->se_cb_seq_nr);
if (task->tk_flags & RPC_TASK_KILLED)
goto need_restart;
out:
return ret;
retry_nowait:
if (rpc_restart_call_prepare(task))
ret = false;
goto out;
need_restart:
task->tk_status = 0;
cb->cb_need_restart = true;
return false;
}
static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
{
struct nfsd4_callback *cb = calldata;
@ -893,37 +974,8 @@ static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
dprintk("%s: minorversion=%d\n", __func__,
clp->cl_minorversion);
if (clp->cl_minorversion) {
/*
* No need for lock, access serialized in nfsd4_cb_prepare
*
* RFC5661 20.9.3
* If CB_SEQUENCE returns an error, then the state of the slot
* (sequence ID, cached reply) MUST NOT change.
*/
if (cb->cb_update_seq_nr)
++clp->cl_cb_session->se_cb_seq_nr;
clear_bit(0, &clp->cl_cb_slot_busy);
rpc_wake_up_next(&clp->cl_cb_waitq);
dprintk("%s: freed slot, new seqid=%d\n", __func__,
clp->cl_cb_session->se_cb_seq_nr);
}
/*
* If the backchannel connection was shut down while this
* task was queued, we need to resubmit it after setting up
* a new backchannel connection.
*
* Note that if we lost our callback connection permanently
* the submission code will error out, so we don't need to
* handle that case here.
*/
if (task->tk_flags & RPC_TASK_KILLED) {
task->tk_status = 0;
cb->cb_need_restart = true;
if (!nfsd4_cb_sequence_done(task, cb))
return;
}
if (cb->cb_status) {
WARN_ON_ONCE(task->tk_status);
@ -1099,8 +1151,8 @@ void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
cb->cb_msg.rpc_resp = cb;
cb->cb_ops = ops;
INIT_WORK(&cb->cb_work, nfsd4_run_cb_work);
cb->cb_seq_status = 1;
cb->cb_status = 0;
cb->cb_update_seq_nr = false;
cb->cb_need_restart = false;
}

2
fs/nfsd/state.h
View File

@ -67,8 +67,8 @@ struct nfsd4_callback {
struct rpc_message cb_msg;
struct nfsd4_callback_ops *cb_ops;
struct work_struct cb_work;
int cb_seq_status;
int cb_status;
bool cb_update_seq_nr;
bool cb_need_restart;
};