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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: 05f4c350ee
("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>
This commit is contained in:
parent
06bed7d18c
commit
1fc0703af3
@ -566,20 +566,14 @@ static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b)
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}
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/*
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* Returns true if the server owners match
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* Returns true if the server major ids match
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*/
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static bool
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nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b)
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nfs4_check_clientid_trunking(struct nfs_client *a, struct nfs_client *b)
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{
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struct nfs41_server_owner *o1 = a->cl_serverowner;
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struct nfs41_server_owner *o2 = b->cl_serverowner;
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if (o1->minor_id != o2->minor_id) {
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dprintk("NFS: --> %s server owner minor IDs do not match\n",
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__func__);
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return false;
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}
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if (o1->major_id_sz != o2->major_id_sz)
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goto out_major_mismatch;
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if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0)
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@ -654,7 +648,12 @@ int nfs41_walk_client_list(struct nfs_client *new,
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if (!nfs4_match_clientids(pos, new))
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continue;
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if (!nfs4_match_serverowners(pos, new))
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/*
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* Note that session trunking is just a special subcase of
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* client id trunking. In either case, we want to fall back
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* to using the existing nfs_client.
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*/
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if (!nfs4_check_clientid_trunking(pos, new))
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continue;
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atomic_inc(&pos->cl_count);
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