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NFSv4.1: Handle NFS4ERR_BADSLOT errors correctly

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Most (all) NFS4ERR_BADSLOT errors are due to the client failing to
respect the server's sr_highest_slotid limit. This mainly happens
due to reordered RPC requests.
The way to handle it is simply to drop the slot that we're using,
and retry using the new highest_slotid limits.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-12-11 10:31:12 -05:00
parent 7ce0171d4f
commit 8556307374
1 changed files with 12 additions and 1 deletions
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13
fs/nfs/nfs4proc.c
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@ -422,6 +422,7 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
struct nfs4_slot *slot;
unsigned long timestamp;
struct nfs_client *clp;
int ret = 1;
/*
* sr_status remains 1 if an RPC level error occurred. The server
@ -462,6 +463,16 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
slot->slot_nr,
slot->seq_nr);
goto out_retry;
case -NFS4ERR_BADSLOT:
/*
* The slot id we used was probably retired. Try again
* using a different slot id.
*/
if (rpc_restart_call_prepare(task)) {
task->tk_status = 0;
ret = 0;
}
break;
default:
/* Just update the slot sequence no. */
++slot->seq_nr;
@ -470,7 +481,7 @@ static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *
/* The session may be reset by one of the error handlers. */
dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
nfs41_sequence_free_slot(res);
return 1;
return ret;
out_retry:
if (!rpc_restart_call(task))
goto out;