From 14d1bbb0ca425c4fdd9a38eaac346c028661b752 Mon Sep 17 00:00:00 2001 From: Anna Schumaker Date: Fri, 7 Apr 2017 14:15:13 -0400 Subject: [PATCH] NFS: Create a common nfs4_match_client() function This puts all the common code in a single place for the walk_client_list() functions. Signed-off-by: Anna Schumaker Signed-off-by: Trond Myklebust --- fs/nfs/nfs4client.c | 119 ++++++++++++++++++++------------------------ 1 file changed, 55 insertions(+), 64 deletions(-) diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 4f4f179cb849..8853c32eedf5 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -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; } -- 2.20.1