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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-01-02 16:25:08 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-01-05 19:40:53 -0800
commit1fc0703af3143914a389bfa081c7acb09502ed5d (patch)
tree587ce968c922728e34e529f5f3623edb94a0749f /fs
parent06bed7d18c2c07b3e3eeadf4bd357f6e806618cc (diff)
NFSv4.1: Fix client id trunking on Linux
Currently, our trunking code will check for session trunking, but will fail to detect client id trunking. This is a problem, because it means that the client will fail to recognise that the two connections represent shared state, even if they do not permit a shared session. By removing the check for the server minor id, and only checking the major id, we will end up doing the right thing in both cases: we close down the new nfs_client and fall back to using the existing one. Fixes: 05f4c350ee02e ("NFS: Discover NFSv4 server trunking when mounting") Cc: Chuck Lever <chuck.lever@oracle.com> Cc: stable@vger.kernel.org # 3.7.x Tested-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4client.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 03311259b0c4..d949d0f378ec 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -566,20 +566,14 @@ static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
}
/*
- * Returns true if the server owners match
+ * Returns true if the server major ids match
*/
static bool
-nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
+nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
{
struct nfs41_server_owner *o1 = a->cl_serverowner;
struct nfs41_server_owner *o2 = b->cl_serverowner;
- if (o1->minor_id != o2->minor_id) {
- dprintk("NFS: --> %s server owner minor IDs do not match\n",
- __func__);
- return false;
- }
-
if (o1->major_id_sz != o2->major_id_sz)
goto out_major_mismatch;
if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
@@ -654,7 +648,12 @@ int nfs41_walk_client_list(struct nfs_client *new,
if (!nfs4_match_clientids(pos, new))
continue;
- if (!nfs4_match_serverowners(pos, new))
+ /*
+ * Note that session trunking is just a special subcase of
+ * client id trunking. In either case, we want to fall back
+ * to using the existing nfs_client.
+ */
+ if (!nfs4_check_clientid_trunking(pos, new))
continue;
atomic_inc(&pos->cl_count);

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