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NFS: Create a common nfs4_match_client() function

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This puts all the common code in a single place for the
walk_client_list() functions.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Anna Schumaker 2017-04-07 14:15:13 -04:00 committed by Trond Myklebust
parent 5b6d3ff605
commit 14d1bbb0ca
1 changed files with 55 additions and 64 deletions
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119
fs/nfs/nfs4client.c
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@ -469,6 +469,50 @@ static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
}
static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
struct nfs_client **prev, struct nfs_net *nn)
{
int status;
if (pos->rpc_ops != new->rpc_ops)
return 1;
if (pos->cl_minorversion != new->cl_minorversion)
return 1;
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos", especially the client
* ID and serverowner fields. Wait for CREATE_SESSION
* to finish. */
if (pos->cl_cons_state > NFS_CS_READY) {
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(*prev);
*prev = pos;
status = nfs_wait_client_init_complete(pos);
spin_lock(&nn->nfs_client_lock);
if (status < 0)
return status;
}
if (pos->cl_cons_state != NFS_CS_READY)
return 1;
if (pos->cl_clientid != new->cl_clientid)
return 1;
/* NFSv4.1 always uses the uniform string, however someone
* might switch the uniquifier string on us.
*/
if (!nfs4_match_client_owner_id(pos, new))
return 1;
return 0;
}
/**
* nfs40_walk_client_list - Find server that recognizes a client ID
*
@ -497,34 +541,10 @@ int nfs40_walk_client_list(struct nfs_client *new,
spin_lock(&nn->nfs_client_lock);
list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
if (pos->rpc_ops != new->rpc_ops)
continue;
if (pos->cl_minorversion != new->cl_minorversion)
continue;
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos" */
if (pos->cl_cons_state > NFS_CS_READY) {
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(prev);
prev = pos;
status = nfs_wait_client_init_complete(pos);
if (status < 0)
goto out;
status = -NFS4ERR_STALE_CLIENTID;
spin_lock(&nn->nfs_client_lock);
}
if (pos->cl_cons_state != NFS_CS_READY)
continue;
if (pos->cl_clientid != new->cl_clientid)
continue;
if (!nfs4_match_client_owner_id(pos, new))
status = nfs4_match_client(pos, new, &prev, nn);
if (status < 0)
goto out_unlock;
if (status != 0)
continue;
/*
* We just sent a new SETCLIENTID, which should have
@ -567,11 +587,13 @@ int nfs40_walk_client_list(struct nfs_client *new,
*/
nfs4_schedule_path_down_recovery(pos);
default:
spin_lock(&nn->nfs_client_lock);
goto out;
}
spin_lock(&nn->nfs_client_lock);
}
out_unlock:
spin_unlock(&nn->nfs_client_lock);
/* No match found. The server lost our clientid */
@ -704,33 +726,10 @@ int nfs41_walk_client_list(struct nfs_client *new,
if (pos == new)
goto found;
if (pos->rpc_ops != new->rpc_ops)
continue;
if (pos->cl_minorversion != new->cl_minorversion)
continue;
/* If "pos" isn't marked ready, we can't trust the
* remaining fields in "pos", especially the client
* ID and serverowner fields. Wait for CREATE_SESSION
* to finish. */
if (pos->cl_cons_state > NFS_CS_READY) {
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
nfs_put_client(prev);
prev = pos;
status = nfs_wait_client_init_complete(pos);
spin_lock(&nn->nfs_client_lock);
if (status < 0)
break;
status = -NFS4ERR_STALE_CLIENTID;
}
if (pos->cl_cons_state != NFS_CS_READY)
continue;
if (pos->cl_clientid != new->cl_clientid)
status = nfs4_match_client(pos, new, &prev, nn);
if (status < 0)
goto out;
if (status != 0)
continue;
/*
@ -742,23 +741,15 @@ int nfs41_walk_client_list(struct nfs_client *new,
new->cl_serverowner))
continue;
/* Unlike NFSv4.0, we know that NFSv4.1 always uses the
* uniform string, however someone might switch the
* uniquifier string on us.
*/
if (!nfs4_match_client_owner_id(pos, new))
continue;
found:
atomic_inc(&pos->cl_count);
*result = pos;
status = 0;
dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n",
__func__, pos, atomic_read(&pos->cl_count));
break;
}
out:
spin_unlock(&nn->nfs_client_lock);
dprintk("NFS: <-- %s status = %d\n", __func__, status);
nfs_put_client(prev);
return status;
}