diff options
| author | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-01-02 16:25:08 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-27 07:52:32 -0800 |
| commit | a8c44ea097e3a4eb9ca26f2f592a2873bb4144ff (patch) | |
| tree | 2d5ae973d418e0681a413da18155fafe0b75f946 /fs | |
| parent | 1bd60326bf850ad56f000c0a66e00c2d3f692ad8 (diff) | |
| download | lwn-a8c44ea097e3a4eb9ca26f2f592a2873bb4144ff.tar.gz lwn-a8c44ea097e3a4eb9ca26f2f592a2873bb4144ff.zip | |
NFSv4.1: Fix client id trunking on Linux
commit 1fc0703af3143914a389bfa081c7acb09502ed5d upstream.
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>
Tested-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/nfs4client.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index cc143ee7a56e..519833d0457e 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -394,20 +394,14 @@ 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) @@ -483,7 +477,12 @@ 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); |