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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-03-03 20:28:59 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-03-03 20:42:23 -0500
commit48d66b9749e39e0d4cc37d635df3f18906af38a6 (patch)
treeb64b126f4b74bae8b4fd3db8d26147a2d394477f /fs/nfs/nfs4state.c
parentef070dcb3989f553f5d84edf555eebc7e204099d (diff)
NFSv4: Fix a race in NFSv4.1 server trunking discovery
We do not want to allow a race with another NFS mount to cause nfs41_walk_client_list() to establish a lease on our nfs_client before we're done checking for trunking. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/nfs4state.c')
-rw-r--r--fs/nfs/nfs4state.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 5ad908e9ce9c..d8b43f0e08fc 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -346,9 +346,19 @@ int nfs41_discover_server_trunking(struct nfs_client *clp,
status = nfs4_proc_exchange_id(clp, cred);
if (status != NFS4_OK)
return status;
- set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
- return nfs41_walk_client_list(clp, result, cred);
+ status = nfs41_walk_client_list(clp, result, cred);
+ if (status < 0)
+ return status;
+ if (clp != *result)
+ return 0;
+
+ set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
+ nfs4_schedule_state_manager(clp);
+ status = nfs_wait_client_init_complete(clp);
+ if (status < 0)
+ nfs_put_client(clp);
+ return status;
}
#endif /* CONFIG_NFS_V4_1 */