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NFSv4: Fix a race in NFSv4.1 server trunking discovery

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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>
This commit is contained in:
Trond Myklebust
2015-03-03 20:28:59 -05:00
parent ef070dcb39
commit 48d66b9749
3 changed files with 17 additions and 8 deletions
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14
fs/nfs/nfs4state.c
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@@ -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 */