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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-01-03 15:35:27 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-01-05 19:40:53 -0800
commit55b9df93ddd684cbc4c2dee9b8a99f6e48348212 (patch)
tree23d80bb002807d513aa8d44d068cd7ec6f124123
parentceb3a16c070c403f5f9ca46b46cf2bb79ea11750 (diff)
NFSv4/v4.1: Verify the client owner id during trunking detection
While we normally expect the NFSv4 client to always send the same client owner to all servers, there are a couple of situations where that is not the case: 1) In NFSv4.0, switching between use of '-omigration' and not will cause the kernel to switch between using the non-uniform and uniform client strings. 2) In NFSv4.1, or NFSv4.0 when using uniform client strings, if the uniquifier string is suddenly changed. This patch will catch those situations by checking the client owner id in the trunking detection code, and will do the right thing if it notices that the strings differ. Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/nfs4client.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 6ee9bf69a7a6..b1024bcc65c8 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -453,6 +453,14 @@ static void nfs4_swap_callback_idents(struct nfs_client *keep,
spin_unlock(&nn->nfs_client_lock);
}
+static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
+ const struct nfs_client *clp2)
+{
+ if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
+ return true;
+ return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
+}
+
/**
* nfs40_walk_client_list - Find server that recognizes a client ID
*
@@ -511,6 +519,9 @@ int nfs40_walk_client_list(struct nfs_client *new,
if (pos->cl_clientid != new->cl_clientid)
continue;
+ if (!nfs4_match_client_owner_id(pos, new))
+ continue;
+
atomic_inc(&pos->cl_count);
spin_unlock(&nn->nfs_client_lock);
@@ -657,6 +668,13 @@ int nfs41_walk_client_list(struct nfs_client *new,
if (!nfs4_check_clientid_trunking(pos, new))
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;
+
atomic_inc(&pos->cl_count);
*result = pos;
status = 0;

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