diff options
author | Andrew Elble <aweits@rit.edu> | 2017-11-03 14:06:31 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:35:51 +0000 |
commit | 6b9f616effa8401bdd393099cb17adb5f7ecd3a4 (patch) | |
tree | 7bd3e50b81c2b458aff7642295638cc9fc095a8f /fs | |
parent | c3014cd85e7ac963592b9efb1961f28e5bcadb4d (diff) |
nfsd: deal with revoked delegations appropriately
commit 95da1b3a5aded124dd1bda1e3cdb876184813140 upstream.
If a delegation has been revoked by the server, operations using that
delegation should error out with NFS4ERR_DELEG_REVOKED in the >4.1
case, and NFS4ERR_BAD_STATEID otherwise.
The server needs NFSv4.1 clients to explicitly free revoked delegations.
If the server returns NFS4ERR_DELEG_REVOKED, the client will do that;
otherwise it may just forget about the delegation and be unable to
recover when it later sees SEQ4_STATUS_RECALLABLE_STATE_REVOKED set on a
SEQUENCE reply. That can cause the Linux 4.1 client to loop in its
stage manager.
Signed-off-by: Andrew Elble <aweits@rit.edu>
Reviewed-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/nfsd/nfs4state.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 0b9476aea67e..d59ce5a665d9 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -3602,7 +3602,8 @@ static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, statei { struct nfs4_stid *ret; - ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID); + ret = find_stateid_by_type(cl, s, + NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID); if (!ret) return NULL; return delegstateid(ret); @@ -3625,6 +3626,12 @@ nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open, deleg = find_deleg_stateid(cl, &open->op_delegate_stateid); if (deleg == NULL) goto out; + if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) { + nfs4_put_stid(&deleg->dl_stid); + if (cl->cl_minorversion) + status = nfserr_deleg_revoked; + goto out; + } flags = share_access_to_flags(open->op_share_access); status = nfs4_check_delegmode(deleg, flags); if (status) { @@ -4451,6 +4458,16 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, struct nfs4_stid **s, struct nfsd_net *nn) { __be32 status; + bool return_revoked = false; + + /* + * only return revoked delegations if explicitly asked. + * otherwise we report revoked or bad_stateid status. + */ + if (typemask & NFS4_REVOKED_DELEG_STID) + return_revoked = true; + else if (typemask & NFS4_DELEG_STID) + typemask |= NFS4_REVOKED_DELEG_STID; if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) return nfserr_bad_stateid; @@ -4465,6 +4482,12 @@ nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate, *s = find_stateid_by_type(cstate->clp, stateid, typemask); if (!*s) return nfserr_bad_stateid; + if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) { + nfs4_put_stid(*s); + if (cstate->minorversion) + return nfserr_deleg_revoked; + return nfserr_bad_stateid; + } return nfs_ok; } |