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NFS: Avoid PUTROOTFH when managing leases
Currently, the compound operation the Linux NFS client sends to the server to confirm a client ID looks like this: { SETCLIENTID_CONFIRM; PUTROOTFH; GETATTR(lease_time) } Once the lease is confirmed, it makes sense to know how long before the client will have to renew it. And, performing these operations in the same compound saves a round trip. Unfortunately, this arrangement assumes that the security flavor used for establishing a client ID can also be used to access the server's pseudo-fs. If the server requires a different security flavor to access its pseudo-fs than it allowed for the client's SETCLIENTID operation, the PUTROOTFH in this compound fails with NFS4ERR_WRONGSEC. Even though the SETCLIENTID_CONFIRM succeeded, our client's trunking detection logic interprets the failure of the compound as a failure by the server to confirm the client ID. As part of server trunking detection, the client then begins another SETCLIENTID pass with the same nfs4_client_id. This fails with NFS4ERR_CLID_INUSE because the first SETCLIENTID/SETCLIENTID_CONFIRM already succeeded in confirming that client ID -- it was the PUTROOTFH operation that caused the SETCLIENTID_CONFIRM compound to fail. To address this issue, separate the "establish client ID" step from the "accessing the server's pseudo-fs root" step. The first access of the server's pseudo-fs may require retrying the PUTROOTFH operation with different security flavors. This access is done in nfs4_proc_get_rootfh(). That leaves the matter of how to retrieve the server's lease time. nfs4_proc_fsinfo() already retrieves the lease time value, though none of its callers do anything with the retrieved value (nor do they mark the lease as "renewed"). Note that NFSv4.1 state recovery invokes nfs4_proc_get_lease_time() using the lease management security flavor. This may cause some heartburn if that security flavor isn't the same as the security flavor the server requires for accessing the pseudo-fs. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Cc: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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2ed4b95b7e
commit
83ca7f5ab3
2 changed files with 15 additions and 28 deletions
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@ -3455,12 +3455,21 @@ static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
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static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
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{
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struct nfs4_exception exception = { };
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unsigned long now = jiffies;
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int err;
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do {
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err = nfs4_handle_exception(server,
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_nfs4_do_fsinfo(server, fhandle, fsinfo),
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&exception);
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err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
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if (err == 0) {
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struct nfs_client *clp = server->nfs_client;
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spin_lock(&clp->cl_lock);
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clp->cl_lease_time = fsinfo->lease_time * HZ;
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clp->cl_last_renewal = now;
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spin_unlock(&clp->cl_lock);
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break;
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}
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err = nfs4_handle_exception(server, err, &exception);
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} while (exception.retry);
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return err;
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}
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@ -4301,27 +4310,17 @@ int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
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struct nfs4_setclientid_res *arg,
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struct rpc_cred *cred)
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{
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struct nfs_fsinfo fsinfo;
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
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.rpc_argp = arg,
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.rpc_resp = &fsinfo,
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.rpc_cred = cred,
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};
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unsigned long now;
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int status;
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dprintk("NFS call setclientid_confirm auth=%s, (client ID %llx)\n",
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clp->cl_rpcclient->cl_auth->au_ops->au_name,
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clp->cl_clientid);
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now = jiffies;
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status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
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if (status == 0) {
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spin_lock(&clp->cl_lock);
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clp->cl_lease_time = fsinfo.lease_time * HZ;
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clp->cl_last_renewal = now;
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spin_unlock(&clp->cl_lock);
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}
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dprintk("NFS reply setclientid_confirm: %d\n", status);
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return status;
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}
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@ -530,14 +530,10 @@ static int nfs4_stat_to_errno(int);
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decode_setclientid_maxsz)
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#define NFS4_enc_setclientid_confirm_sz \
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(compound_encode_hdr_maxsz + \
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encode_setclientid_confirm_maxsz + \
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encode_putrootfh_maxsz + \
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encode_fsinfo_maxsz)
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encode_setclientid_confirm_maxsz)
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#define NFS4_dec_setclientid_confirm_sz \
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(compound_decode_hdr_maxsz + \
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decode_setclientid_confirm_maxsz + \
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decode_putrootfh_maxsz + \
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decode_fsinfo_maxsz)
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decode_setclientid_confirm_maxsz)
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#define NFS4_enc_lock_sz (compound_encode_hdr_maxsz + \
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encode_sequence_maxsz + \
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encode_putfh_maxsz + \
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@ -2608,12 +2604,9 @@ static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
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struct compound_hdr hdr = {
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.nops = 0,
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};
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const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };
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encode_compound_hdr(xdr, req, &hdr);
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encode_setclientid_confirm(xdr, arg, &hdr);
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encode_putrootfh(xdr, &hdr);
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encode_fsinfo(xdr, lease_bitmap, &hdr);
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encode_nops(&hdr);
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}
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@ -6647,8 +6640,7 @@ static int nfs4_xdr_dec_setclientid(struct rpc_rqst *req,
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* Decode SETCLIENTID_CONFIRM response
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*/
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static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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struct nfs_fsinfo *fsinfo)
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struct xdr_stream *xdr)
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{
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struct compound_hdr hdr;
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int status;
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@ -6656,10 +6648,6 @@ static int nfs4_xdr_dec_setclientid_confirm(struct rpc_rqst *req,
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status = decode_compound_hdr(xdr, &hdr);
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if (!status)
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status = decode_setclientid_confirm(xdr);
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if (!status)
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status = decode_putrootfh(xdr);
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if (!status)
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status = decode_fsinfo(xdr, fsinfo);
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return status;
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}
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