NFS: Add method to detect whether an FSID is still on the server
Introduce a mechanism for probing a server to determine if an FSID is present or absent. The on-the-wire compound is different between minor version 0 and 1. Minor version 0 appends a RENEW operation to identify which client ID is probing. Minor version 1 has a SEQUENCE operation in the compound which effectively carries the same information. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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@ -208,6 +208,7 @@ struct nfs4_state_maintenance_ops {
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struct nfs4_mig_recovery_ops {
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int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
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struct page *, struct rpc_cred *);
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int (*fsid_present)(struct inode *, struct rpc_cred *);
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};
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extern const struct dentry_operations nfs4_dentry_operations;
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@ -242,6 +243,7 @@ extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struc
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struct nfs4_fs_locations *, struct page *);
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extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
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struct page *page, struct rpc_cred *);
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extern int nfs4_proc_fsid_present(struct inode *, struct rpc_cred *);
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extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, struct qstr *,
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struct nfs_fh *, struct nfs_fattr *);
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extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
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@ -6153,6 +6153,132 @@ int nfs4_proc_get_locations(struct inode *inode,
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return status;
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}
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/*
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* This operation also signals the server that this client is
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* performing "lease moved" recovery. The server can stop
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* returning NFS4ERR_LEASE_MOVED to this client. A RENEW operation
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* is appended to this compound to identify the client ID which is
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* performing recovery.
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*/
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static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
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struct rpc_clnt *clnt = server->client;
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struct nfs4_fsid_present_arg args = {
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.fh = NFS_FH(inode),
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.clientid = clp->cl_clientid,
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.renew = 1, /* append RENEW */
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};
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struct nfs4_fsid_present_res res = {
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.renew = 1,
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
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.rpc_argp = &args,
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.rpc_resp = &res,
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.rpc_cred = cred,
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};
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unsigned long now = jiffies;
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int status;
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res.fh = nfs_alloc_fhandle();
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if (res.fh == NULL)
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return -ENOMEM;
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nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
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nfs4_set_sequence_privileged(&args.seq_args);
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status = nfs4_call_sync_sequence(clnt, server, &msg,
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&args.seq_args, &res.seq_res);
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nfs_free_fhandle(res.fh);
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if (status)
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return status;
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do_renew_lease(clp, now);
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return 0;
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}
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#ifdef CONFIG_NFS_V4_1
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/*
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* This operation also signals the server that this client is
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* performing "lease moved" recovery. The server can stop asserting
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* SEQ4_STATUS_LEASE_MOVED for this client. The client ID performing
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* this operation is identified in the SEQUENCE operation in this
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* compound.
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*/
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static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct rpc_clnt *clnt = server->client;
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struct nfs4_fsid_present_arg args = {
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.fh = NFS_FH(inode),
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};
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struct nfs4_fsid_present_res res = {
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
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.rpc_argp = &args,
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.rpc_resp = &res,
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.rpc_cred = cred,
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};
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int status;
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res.fh = nfs_alloc_fhandle();
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if (res.fh == NULL)
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return -ENOMEM;
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nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
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nfs4_set_sequence_privileged(&args.seq_args);
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status = nfs4_call_sync_sequence(clnt, server, &msg,
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&args.seq_args, &res.seq_res);
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nfs_free_fhandle(res.fh);
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if (status == NFS4_OK &&
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res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
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status = -NFS4ERR_LEASE_MOVED;
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return status;
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}
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#endif /* CONFIG_NFS_V4_1 */
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/**
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* nfs4_proc_fsid_present - Is this FSID present or absent on server?
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* @inode: inode on FSID to check
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* @cred: credential to use for this operation
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*
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* Server indicates whether the FSID is present, moved, or not
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* recognized. This operation is necessary to clear a LEASE_MOVED
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* condition for this client ID.
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*
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* Returns NFS4_OK if the FSID is present on this server,
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* -NFS4ERR_MOVED if the FSID is no longer present, a negative
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* NFS4ERR code if some error occurred on the server, or a
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* negative errno if a local failure occurred.
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*/
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int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_client *clp = server->nfs_client;
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const struct nfs4_mig_recovery_ops *ops =
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clp->cl_mvops->mig_recovery_ops;
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struct nfs4_exception exception = { };
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int status;
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dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
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(unsigned long long)server->fsid.major,
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(unsigned long long)server->fsid.minor,
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clp->cl_hostname);
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nfs_display_fhandle(NFS_FH(inode), __func__);
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do {
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status = ops->fsid_present(inode, cred);
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if (status != -NFS4ERR_DELAY)
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break;
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nfs4_handle_exception(server, status, &exception);
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} while (exception.retry);
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return status;
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}
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/**
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* If 'use_integrity' is true and the state managment nfs_client
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* cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
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@ -8052,11 +8178,13 @@ static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
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static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
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.get_locations = _nfs40_proc_get_locations,
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.fsid_present = _nfs40_proc_fsid_present,
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};
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#if defined(CONFIG_NFS_V4_1)
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static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
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.get_locations = _nfs41_proc_get_locations,
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.fsid_present = _nfs41_proc_fsid_present,
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};
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#endif /* CONFIG_NFS_V4_1 */
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@ -595,11 +595,13 @@ static int nfs4_stat_to_errno(int);
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#define NFS4_enc_getattr_sz (compound_encode_hdr_maxsz + \
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encode_sequence_maxsz + \
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encode_putfh_maxsz + \
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encode_getattr_maxsz)
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encode_getattr_maxsz + \
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encode_renew_maxsz)
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#define NFS4_dec_getattr_sz (compound_decode_hdr_maxsz + \
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decode_sequence_maxsz + \
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decode_putfh_maxsz + \
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decode_getattr_maxsz)
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decode_getattr_maxsz + \
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decode_renew_maxsz)
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#define NFS4_enc_lookup_sz (compound_encode_hdr_maxsz + \
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encode_sequence_maxsz + \
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encode_putfh_maxsz + \
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@ -753,6 +755,18 @@ static int nfs4_stat_to_errno(int);
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decode_sequence_maxsz + \
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decode_putfh_maxsz + \
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decode_secinfo_maxsz)
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#define NFS4_enc_fsid_present_sz \
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(compound_encode_hdr_maxsz + \
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encode_sequence_maxsz + \
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encode_putfh_maxsz + \
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encode_getfh_maxsz + \
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encode_renew_maxsz)
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#define NFS4_dec_fsid_present_sz \
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(compound_decode_hdr_maxsz + \
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decode_sequence_maxsz + \
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decode_putfh_maxsz + \
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decode_getfh_maxsz + \
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decode_renew_maxsz)
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#if defined(CONFIG_NFS_V4_1)
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#define NFS4_enc_bind_conn_to_session_sz \
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(compound_encode_hdr_maxsz + \
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@ -2726,6 +2740,26 @@ static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
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encode_nops(&hdr);
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}
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/*
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* Encode FSID_PRESENT request
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*/
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static void nfs4_xdr_enc_fsid_present(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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struct nfs4_fsid_present_arg *args)
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{
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struct compound_hdr hdr = {
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.minorversion = nfs4_xdr_minorversion(&args->seq_args),
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};
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encode_compound_hdr(xdr, req, &hdr);
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encode_sequence(xdr, &args->seq_args, &hdr);
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encode_putfh(xdr, args->fh, &hdr);
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encode_getfh(xdr, &hdr);
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if (args->renew)
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encode_renew(xdr, args->clientid, &hdr);
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encode_nops(&hdr);
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}
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#if defined(CONFIG_NFS_V4_1)
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/*
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* BIND_CONN_TO_SESSION request
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return status;
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}
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/*
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* Decode FSID_PRESENT response
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*/
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static int nfs4_xdr_dec_fsid_present(struct rpc_rqst *rqstp,
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struct xdr_stream *xdr,
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struct nfs4_fsid_present_res *res)
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{
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struct compound_hdr hdr;
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int status;
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status = decode_compound_hdr(xdr, &hdr);
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if (status)
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goto out;
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status = decode_sequence(xdr, &res->seq_res, rqstp);
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if (status)
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goto out;
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status = decode_putfh(xdr);
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if (status)
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goto out;
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status = decode_getfh(xdr, res->fh);
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if (status)
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goto out;
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if (res->renew)
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status = decode_renew(xdr);
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out:
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return status;
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}
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#if defined(CONFIG_NFS_V4_1)
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/*
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* Decode BIND_CONN_TO_SESSION response
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@ -7397,6 +7459,7 @@ struct rpc_procinfo nfs4_procedures[] = {
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PROC(FS_LOCATIONS, enc_fs_locations, dec_fs_locations),
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PROC(RELEASE_LOCKOWNER, enc_release_lockowner, dec_release_lockowner),
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PROC(SECINFO, enc_secinfo, dec_secinfo),
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PROC(FSID_PRESENT, enc_fsid_present, dec_fsid_present),
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#if defined(CONFIG_NFS_V4_1)
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PROC(EXCHANGE_ID, enc_exchange_id, dec_exchange_id),
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PROC(CREATE_SESSION, enc_create_session, dec_create_session),
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@ -460,6 +460,7 @@ enum {
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NFSPROC4_CLNT_FS_LOCATIONS,
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NFSPROC4_CLNT_RELEASE_LOCKOWNER,
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NFSPROC4_CLNT_SECINFO,
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NFSPROC4_CLNT_FSID_PRESENT,
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/* nfs41 */
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NFSPROC4_CLNT_EXCHANGE_ID,
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@ -1088,6 +1088,19 @@ struct nfs4_secinfo_res {
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struct nfs4_secinfo_flavors *flavors;
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};
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struct nfs4_fsid_present_arg {
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struct nfs4_sequence_args seq_args;
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const struct nfs_fh *fh;
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clientid4 clientid;
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unsigned char renew:1;
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};
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struct nfs4_fsid_present_res {
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struct nfs4_sequence_res seq_res;
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struct nfs_fh *fh;
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unsigned char renew:1;
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};
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#endif /* CONFIG_NFS_V4 */
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struct nfstime4 {
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