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| author |   J. Bruce Fields <bfields@redhat.com> | 2012-05-04 14:57:52 -0400 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2012-05-31 20:30:14 -0400 |
| commit | 7447758be712e891aa4c57f8fa11902ccfdff151 (patch) | |
| tree | 9764abcab312590c1ede8981a7e69998955bbfdb /fs/nfsd | |
| parent | nfsd4: simpler ordering of setclientid_confirm checks (diff) | |
| download | linux-dev-7447758be712e891aa4c57f8fa11902ccfdff151.tar.xz linux-dev-7447758be712e891aa4c57f8fa11902ccfdff151.zip | |
nfsd4: clarify that renewing expired client is a bug
This can't happen:
- cl_time is zeroed only by unhash_client_locked, which is only
ever called under both the state lock and the client lock.
- every caller of renew_client() should have looked up a
(non-expired) client and then called renew_client() all
without dropping the state lock.
- the only other caller of renew_client_locked() is
release_session_client(), which first checks under the
client_lock that the cl_time is nonzero.
So make it clear that this is a bug, not something we handle. I can't
quite bring myself to make this a BUG(), though, as there are a lot of
renew_client() callers, and returning here is probably safer than a
BUG().
We'll consider making it a BUG() after some more cleanup.
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'fs/nfsd')
| -rw-r--r-- | fs/nfsd/nfs4state.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 991a8a7414f7..e4d9b56a770a 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1022,7 +1022,8 @@ static inline void renew_client_locked(struct nfs4_client *clp) { if (is_client_expired(clp)) { - dprintk("%s: client (clientid %08x/%08x) already expired\n", + WARN_ON(1); + printk("%s: client (clientid %08x/%08x) already expired\n", __func__, clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); |