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NFSv4.1: Fix client id trunking on Linux

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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:
Trond Myklebust 2015-01-02 16:25:08 -05:00
parent 06bed7d18c
commit 1fc0703af3
1 changed files with 8 additions and 9 deletions
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17
fs/nfs/nfs4client.c
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@ -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);