![J. Bruce Fields](/assets/img/avatar_default.png)
For the most part readers of cl_cb_state only need a value that is "eventually" right. And the value is set only either 1) in response to some change of state, in which case it's set to UNKNOWN and then a callback rpc is sent to probe the real state, or b) in the handling of a response to such a callback. UNKNOWN is therefore always a "temporary" state, and for the other states we're happy to accept last writer wins. So I think we're OK here. Signed-off-by: J. Bruce Fields <bfields@redhat.com>
1038 lines
26 KiB
C
1038 lines
26 KiB
C
/*
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* Copyright (c) 2001 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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* Andy Adamson <andros@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/sunrpc/clnt.h>
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#include <linux/sunrpc/svc_xprt.h>
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#include <linux/slab.h>
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#include "nfsd.h"
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#include "state.h"
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason);
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#define NFSPROC4_CB_NULL 0
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#define NFSPROC4_CB_COMPOUND 1
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/* Index of predefined Linux callback client operations */
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enum {
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NFSPROC4_CLNT_CB_NULL = 0,
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NFSPROC4_CLNT_CB_RECALL,
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NFSPROC4_CLNT_CB_SEQUENCE,
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};
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#define NFS4_MAXTAGLEN 20
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#define NFS4_enc_cb_null_sz 0
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#define NFS4_dec_cb_null_sz 0
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#define cb_compound_enc_hdr_sz 4
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#define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2))
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#define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2)
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#define cb_sequence_enc_sz (sessionid_sz + 4 + \
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1 /* no referring calls list yet */)
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#define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4)
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#define op_enc_sz 1
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#define op_dec_sz 2
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#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2))
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#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2)
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#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \
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cb_sequence_enc_sz + \
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1 + enc_stateid_sz + \
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enc_nfs4_fh_sz)
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#define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \
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cb_sequence_dec_sz + \
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op_dec_sz)
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struct nfs4_cb_compound_hdr {
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/* args */
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u32 ident; /* minorversion 0 only */
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u32 nops;
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__be32 *nops_p;
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u32 minorversion;
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/* res */
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int status;
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};
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/*
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* Handle decode buffer overflows out-of-line.
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*/
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static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
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{
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dprintk("NFS: %s prematurely hit the end of our receive buffer. "
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"Remaining buffer length is %tu words.\n",
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func, xdr->end - xdr->p);
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}
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static __be32 *xdr_encode_empty_array(__be32 *p)
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{
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*p++ = xdr_zero;
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return p;
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}
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/*
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* Encode/decode NFSv4 CB basic data types
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*
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* Basic NFSv4 callback data types are defined in section 15 of RFC
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* 3530: "Network File System (NFS) version 4 Protocol" and section
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* 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version
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* 1 Protocol"
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*/
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/*
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* nfs_cb_opnum4
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*
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* enum nfs_cb_opnum4 {
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* OP_CB_GETATTR = 3,
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* ...
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* };
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*/
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enum nfs_cb_opnum4 {
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OP_CB_GETATTR = 3,
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OP_CB_RECALL = 4,
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OP_CB_LAYOUTRECALL = 5,
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OP_CB_NOTIFY = 6,
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OP_CB_PUSH_DELEG = 7,
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OP_CB_RECALL_ANY = 8,
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OP_CB_RECALLABLE_OBJ_AVAIL = 9,
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OP_CB_RECALL_SLOT = 10,
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OP_CB_SEQUENCE = 11,
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OP_CB_WANTS_CANCELLED = 12,
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OP_CB_NOTIFY_LOCK = 13,
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OP_CB_NOTIFY_DEVICEID = 14,
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OP_CB_ILLEGAL = 10044
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};
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static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, 4);
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*p = cpu_to_be32(op);
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}
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/*
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* nfs_fh4
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*
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* typedef opaque nfs_fh4<NFS4_FHSIZE>;
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*/
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static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh)
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{
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u32 length = fh->fh_size;
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__be32 *p;
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BUG_ON(length > NFS4_FHSIZE);
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p = xdr_reserve_space(xdr, 4 + length);
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xdr_encode_opaque(p, &fh->fh_base, length);
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}
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/*
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* stateid4
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*
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* struct stateid4 {
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* uint32_t seqid;
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* opaque other[12];
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* };
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*/
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static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE);
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*p++ = cpu_to_be32(sid->si_generation);
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xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE);
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}
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/*
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* sessionid4
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*
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* typedef opaque sessionid4[NFS4_SESSIONID_SIZE];
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*/
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static void encode_sessionid4(struct xdr_stream *xdr,
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const struct nfsd4_session *session)
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{
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__be32 *p;
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p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN);
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xdr_encode_opaque_fixed(p, session->se_sessionid.data,
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NFS4_MAX_SESSIONID_LEN);
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}
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/*
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* nfsstat4
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*/
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static const struct {
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int stat;
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int errno;
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} nfs_cb_errtbl[] = {
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{ NFS4_OK, 0 },
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{ NFS4ERR_PERM, -EPERM },
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{ NFS4ERR_NOENT, -ENOENT },
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{ NFS4ERR_IO, -EIO },
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{ NFS4ERR_NXIO, -ENXIO },
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{ NFS4ERR_ACCESS, -EACCES },
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{ NFS4ERR_EXIST, -EEXIST },
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{ NFS4ERR_XDEV, -EXDEV },
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{ NFS4ERR_NOTDIR, -ENOTDIR },
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{ NFS4ERR_ISDIR, -EISDIR },
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{ NFS4ERR_INVAL, -EINVAL },
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{ NFS4ERR_FBIG, -EFBIG },
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{ NFS4ERR_NOSPC, -ENOSPC },
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{ NFS4ERR_ROFS, -EROFS },
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{ NFS4ERR_MLINK, -EMLINK },
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{ NFS4ERR_NAMETOOLONG, -ENAMETOOLONG },
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{ NFS4ERR_NOTEMPTY, -ENOTEMPTY },
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{ NFS4ERR_DQUOT, -EDQUOT },
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{ NFS4ERR_STALE, -ESTALE },
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{ NFS4ERR_BADHANDLE, -EBADHANDLE },
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{ NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
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{ NFS4ERR_NOTSUPP, -ENOTSUPP },
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{ NFS4ERR_TOOSMALL, -ETOOSMALL },
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{ NFS4ERR_SERVERFAULT, -ESERVERFAULT },
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{ NFS4ERR_BADTYPE, -EBADTYPE },
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{ NFS4ERR_LOCKED, -EAGAIN },
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{ NFS4ERR_RESOURCE, -EREMOTEIO },
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{ NFS4ERR_SYMLINK, -ELOOP },
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{ NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
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{ NFS4ERR_DEADLOCK, -EDEADLK },
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{ -1, -EIO }
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};
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/*
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* If we cannot translate the error, the recovery routines should
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* handle it.
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*
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* Note: remaining NFSv4 error codes have values > 10000, so should
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* not conflict with native Linux error codes.
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*/
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static int nfs_cb_stat_to_errno(int status)
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{
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int i;
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for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) {
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if (nfs_cb_errtbl[i].stat == status)
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return nfs_cb_errtbl[i].errno;
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}
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dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status);
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return -status;
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}
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static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected,
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enum nfsstat4 *status)
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{
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__be32 *p;
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u32 op;
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p = xdr_inline_decode(xdr, 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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op = be32_to_cpup(p++);
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if (unlikely(op != expected))
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goto out_unexpected;
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*status = be32_to_cpup(p);
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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out_unexpected:
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dprintk("NFSD: Callback server returned operation %d but "
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"we issued a request for %d\n", op, expected);
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return -EIO;
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}
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/*
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* CB_COMPOUND4args
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*
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* struct CB_COMPOUND4args {
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* utf8str_cs tag;
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* uint32_t minorversion;
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* uint32_t callback_ident;
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* nfs_cb_argop4 argarray<>;
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* };
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*/
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static void encode_cb_compound4args(struct xdr_stream *xdr,
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struct nfs4_cb_compound_hdr *hdr)
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{
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__be32 * p;
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p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4);
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p = xdr_encode_empty_array(p); /* empty tag */
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*p++ = cpu_to_be32(hdr->minorversion);
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*p++ = cpu_to_be32(hdr->ident);
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hdr->nops_p = p;
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*p = cpu_to_be32(hdr->nops); /* argarray element count */
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}
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/*
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* Update argarray element count
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*/
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static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr)
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{
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BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS);
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*hdr->nops_p = cpu_to_be32(hdr->nops);
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}
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/*
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* CB_COMPOUND4res
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*
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* struct CB_COMPOUND4res {
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* nfsstat4 status;
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* utf8str_cs tag;
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* nfs_cb_resop4 resarray<>;
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* };
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*/
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static int decode_cb_compound4res(struct xdr_stream *xdr,
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struct nfs4_cb_compound_hdr *hdr)
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{
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u32 length;
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__be32 *p;
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p = xdr_inline_decode(xdr, 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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hdr->status = be32_to_cpup(p++);
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/* Ignore the tag */
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length = be32_to_cpup(p++);
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p = xdr_inline_decode(xdr, length + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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hdr->nops = be32_to_cpup(p);
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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/*
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* CB_RECALL4args
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*
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* struct CB_RECALL4args {
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* stateid4 stateid;
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* bool truncate;
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* nfs_fh4 fh;
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* };
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*/
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static void encode_cb_recall4args(struct xdr_stream *xdr,
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const struct nfs4_delegation *dp,
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struct nfs4_cb_compound_hdr *hdr)
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{
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__be32 *p;
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encode_nfs_cb_opnum4(xdr, OP_CB_RECALL);
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encode_stateid4(xdr, &dp->dl_stid.sc_stateid);
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p = xdr_reserve_space(xdr, 4);
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*p++ = xdr_zero; /* truncate */
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encode_nfs_fh4(xdr, &dp->dl_fh);
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hdr->nops++;
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}
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/*
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* CB_SEQUENCE4args
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*
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* struct CB_SEQUENCE4args {
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* sessionid4 csa_sessionid;
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* sequenceid4 csa_sequenceid;
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* slotid4 csa_slotid;
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* slotid4 csa_highest_slotid;
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* bool csa_cachethis;
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* referring_call_list4 csa_referring_call_lists<>;
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* };
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*/
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static void encode_cb_sequence4args(struct xdr_stream *xdr,
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const struct nfsd4_callback *cb,
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struct nfs4_cb_compound_hdr *hdr)
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{
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struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
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__be32 *p;
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if (hdr->minorversion == 0)
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return;
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encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE);
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encode_sessionid4(xdr, session);
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p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4);
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*p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */
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*p++ = xdr_zero; /* csa_slotid */
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*p++ = xdr_zero; /* csa_highest_slotid */
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*p++ = xdr_zero; /* csa_cachethis */
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xdr_encode_empty_array(p); /* csa_referring_call_lists */
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hdr->nops++;
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}
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/*
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* CB_SEQUENCE4resok
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*
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* struct CB_SEQUENCE4resok {
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* sessionid4 csr_sessionid;
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* sequenceid4 csr_sequenceid;
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* slotid4 csr_slotid;
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* slotid4 csr_highest_slotid;
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* slotid4 csr_target_highest_slotid;
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* };
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*
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* union CB_SEQUENCE4res switch (nfsstat4 csr_status) {
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* case NFS4_OK:
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* CB_SEQUENCE4resok csr_resok4;
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* default:
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* void;
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* };
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*
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* Our current back channel implmentation supports a single backchannel
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* with a single slot.
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*/
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static int decode_cb_sequence4resok(struct xdr_stream *xdr,
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struct nfsd4_callback *cb)
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{
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struct nfsd4_session *session = cb->cb_clp->cl_cb_session;
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struct nfs4_sessionid id;
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int status;
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__be32 *p;
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u32 dummy;
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status = -ESERVERFAULT;
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/*
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* If the server returns different values for sessionID, slotID or
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* sequence number, the server is looney tunes.
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*/
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p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4);
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if (unlikely(p == NULL))
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goto out_overflow;
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memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
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if (memcmp(id.data, session->se_sessionid.data,
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NFS4_MAX_SESSIONID_LEN) != 0) {
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dprintk("NFS: %s Invalid session id\n", __func__);
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goto out;
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}
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p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
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dummy = be32_to_cpup(p++);
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if (dummy != session->se_cb_seq_nr) {
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dprintk("NFS: %s Invalid sequence number\n", __func__);
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goto out;
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}
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dummy = be32_to_cpup(p++);
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if (dummy != 0) {
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dprintk("NFS: %s Invalid slotid\n", __func__);
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goto out;
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}
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/*
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* FIXME: process highest slotid and target highest slotid
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*/
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status = 0;
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out:
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if (status)
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nfsd4_mark_cb_fault(cb->cb_clp, status);
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return status;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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static int decode_cb_sequence4res(struct xdr_stream *xdr,
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struct nfsd4_callback *cb)
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{
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enum nfsstat4 nfserr;
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int status;
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if (cb->cb_minorversion == 0)
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return 0;
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status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr);
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if (unlikely(status))
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goto out;
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if (unlikely(nfserr != NFS4_OK))
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goto out_default;
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status = decode_cb_sequence4resok(xdr, cb);
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out:
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return status;
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out_default:
|
|
return nfs_cb_stat_to_errno(nfserr);
|
|
}
|
|
|
|
/*
|
|
* NFSv4.0 and NFSv4.1 XDR encode functions
|
|
*
|
|
* NFSv4.0 callback argument types are defined in section 15 of RFC
|
|
* 3530: "Network File System (NFS) version 4 Protocol" and section 20
|
|
* of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
|
|
* Protocol".
|
|
*/
|
|
|
|
/*
|
|
* NB: Without this zero space reservation, callbacks over krb5p fail
|
|
*/
|
|
static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
void *__unused)
|
|
{
|
|
xdr_reserve_space(xdr, 0);
|
|
}
|
|
|
|
/*
|
|
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
|
|
*/
|
|
static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
const struct nfsd4_callback *cb)
|
|
{
|
|
const struct nfs4_delegation *args = cb->cb_op;
|
|
struct nfs4_cb_compound_hdr hdr = {
|
|
.ident = cb->cb_clp->cl_cb_ident,
|
|
.minorversion = cb->cb_minorversion,
|
|
};
|
|
|
|
encode_cb_compound4args(xdr, &hdr);
|
|
encode_cb_sequence4args(xdr, cb, &hdr);
|
|
encode_cb_recall4args(xdr, args, &hdr);
|
|
encode_cb_nops(&hdr);
|
|
}
|
|
|
|
|
|
/*
|
|
* NFSv4.0 and NFSv4.1 XDR decode functions
|
|
*
|
|
* NFSv4.0 callback result types are defined in section 15 of RFC
|
|
* 3530: "Network File System (NFS) version 4 Protocol" and section 20
|
|
* of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1
|
|
* Protocol".
|
|
*/
|
|
|
|
static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr,
|
|
void *__unused)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 20.2. Operation 4: CB_RECALL - Recall a Delegation
|
|
*/
|
|
static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp,
|
|
struct xdr_stream *xdr,
|
|
struct nfsd4_callback *cb)
|
|
{
|
|
struct nfs4_cb_compound_hdr hdr;
|
|
enum nfsstat4 nfserr;
|
|
int status;
|
|
|
|
status = decode_cb_compound4res(xdr, &hdr);
|
|
if (unlikely(status))
|
|
goto out;
|
|
|
|
if (cb != NULL) {
|
|
status = decode_cb_sequence4res(xdr, cb);
|
|
if (unlikely(status))
|
|
goto out;
|
|
}
|
|
|
|
status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr);
|
|
if (unlikely(status))
|
|
goto out;
|
|
if (unlikely(nfserr != NFS4_OK))
|
|
status = nfs_cb_stat_to_errno(nfserr);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* RPC procedure tables
|
|
*/
|
|
#define PROC(proc, call, argtype, restype) \
|
|
[NFSPROC4_CLNT_##proc] = { \
|
|
.p_proc = NFSPROC4_CB_##call, \
|
|
.p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \
|
|
.p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \
|
|
.p_arglen = NFS4_enc_##argtype##_sz, \
|
|
.p_replen = NFS4_dec_##restype##_sz, \
|
|
.p_statidx = NFSPROC4_CB_##call, \
|
|
.p_name = #proc, \
|
|
}
|
|
|
|
static struct rpc_procinfo nfs4_cb_procedures[] = {
|
|
PROC(CB_NULL, NULL, cb_null, cb_null),
|
|
PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall),
|
|
};
|
|
|
|
static struct rpc_version nfs_cb_version4 = {
|
|
/*
|
|
* Note on the callback rpc program version number: despite language in rfc
|
|
* 5661 section 18.36.3 requiring servers to use 4 in this field, the
|
|
* official xdr descriptions for both 4.0 and 4.1 specify version 1, and
|
|
* in practice that appears to be what implementations use. The section
|
|
* 18.36.3 language is expected to be fixed in an erratum.
|
|
*/
|
|
.number = 1,
|
|
.nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
|
|
.procs = nfs4_cb_procedures
|
|
};
|
|
|
|
static const struct rpc_version *nfs_cb_version[] = {
|
|
&nfs_cb_version4,
|
|
};
|
|
|
|
static const struct rpc_program cb_program;
|
|
|
|
static struct rpc_stat cb_stats = {
|
|
.program = &cb_program
|
|
};
|
|
|
|
#define NFS4_CALLBACK 0x40000000
|
|
static const struct rpc_program cb_program = {
|
|
.name = "nfs4_cb",
|
|
.number = NFS4_CALLBACK,
|
|
.nrvers = ARRAY_SIZE(nfs_cb_version),
|
|
.version = nfs_cb_version,
|
|
.stats = &cb_stats,
|
|
.pipe_dir_name = "nfsd4_cb",
|
|
};
|
|
|
|
static int max_cb_time(void)
|
|
{
|
|
return max(nfsd4_lease/10, (time_t)1) * HZ;
|
|
}
|
|
|
|
|
|
static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses)
|
|
{
|
|
struct rpc_timeout timeparms = {
|
|
.to_initval = max_cb_time(),
|
|
.to_retries = 0,
|
|
};
|
|
struct rpc_create_args args = {
|
|
.net = &init_net,
|
|
.address = (struct sockaddr *) &conn->cb_addr,
|
|
.addrsize = conn->cb_addrlen,
|
|
.saddress = (struct sockaddr *) &conn->cb_saddr,
|
|
.timeout = &timeparms,
|
|
.program = &cb_program,
|
|
.version = 0,
|
|
.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
|
|
};
|
|
struct rpc_clnt *client;
|
|
|
|
if (clp->cl_minorversion == 0) {
|
|
if (!clp->cl_cred.cr_principal &&
|
|
(clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
|
|
return -EINVAL;
|
|
args.client_name = clp->cl_cred.cr_principal;
|
|
args.prognumber = conn->cb_prog,
|
|
args.protocol = XPRT_TRANSPORT_TCP;
|
|
args.authflavor = clp->cl_flavor;
|
|
clp->cl_cb_ident = conn->cb_ident;
|
|
} else {
|
|
if (!conn->cb_xprt)
|
|
return -EINVAL;
|
|
clp->cl_cb_conn.cb_xprt = conn->cb_xprt;
|
|
clp->cl_cb_session = ses;
|
|
args.bc_xprt = conn->cb_xprt;
|
|
args.prognumber = clp->cl_cb_session->se_cb_prog;
|
|
args.protocol = XPRT_TRANSPORT_BC_TCP;
|
|
args.authflavor = RPC_AUTH_UNIX;
|
|
}
|
|
/* Create RPC client */
|
|
client = rpc_create(&args);
|
|
if (IS_ERR(client)) {
|
|
dprintk("NFSD: couldn't create callback client: %ld\n",
|
|
PTR_ERR(client));
|
|
return PTR_ERR(client);
|
|
}
|
|
clp->cl_cb_client = client;
|
|
return 0;
|
|
|
|
}
|
|
|
|
static void warn_no_callback_path(struct nfs4_client *clp, int reason)
|
|
{
|
|
dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
|
|
(int)clp->cl_name.len, clp->cl_name.data, reason);
|
|
}
|
|
|
|
static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason)
|
|
{
|
|
clp->cl_cb_state = NFSD4_CB_DOWN;
|
|
warn_no_callback_path(clp, reason);
|
|
}
|
|
|
|
static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason)
|
|
{
|
|
clp->cl_cb_state = NFSD4_CB_FAULT;
|
|
warn_no_callback_path(clp, reason);
|
|
}
|
|
|
|
static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null);
|
|
|
|
if (task->tk_status)
|
|
nfsd4_mark_cb_down(clp, task->tk_status);
|
|
else
|
|
clp->cl_cb_state = NFSD4_CB_UP;
|
|
}
|
|
|
|
static const struct rpc_call_ops nfsd4_cb_probe_ops = {
|
|
/* XXX: release method to ensure we set the cb channel down if
|
|
* necessary on early failure? */
|
|
.rpc_call_done = nfsd4_cb_probe_done,
|
|
};
|
|
|
|
static struct rpc_cred *callback_cred;
|
|
|
|
int set_callback_cred(void)
|
|
{
|
|
if (callback_cred)
|
|
return 0;
|
|
callback_cred = rpc_lookup_machine_cred("nfs");
|
|
if (!callback_cred)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static struct workqueue_struct *callback_wq;
|
|
|
|
static void run_nfsd4_cb(struct nfsd4_callback *cb)
|
|
{
|
|
queue_work(callback_wq, &cb->cb_work);
|
|
}
|
|
|
|
static void do_probe_callback(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd4_callback *cb = &clp->cl_cb_null;
|
|
|
|
cb->cb_op = NULL;
|
|
cb->cb_clp = clp;
|
|
|
|
cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL];
|
|
cb->cb_msg.rpc_argp = NULL;
|
|
cb->cb_msg.rpc_resp = NULL;
|
|
cb->cb_msg.rpc_cred = callback_cred;
|
|
|
|
cb->cb_ops = &nfsd4_cb_probe_ops;
|
|
|
|
run_nfsd4_cb(cb);
|
|
}
|
|
|
|
/*
|
|
* Poke the callback thread to process any updates to the callback
|
|
* parameters, and send a null probe.
|
|
*/
|
|
void nfsd4_probe_callback(struct nfs4_client *clp)
|
|
{
|
|
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
|
|
set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
|
|
do_probe_callback(clp);
|
|
}
|
|
|
|
void nfsd4_probe_callback_sync(struct nfs4_client *clp)
|
|
{
|
|
nfsd4_probe_callback(clp);
|
|
flush_workqueue(callback_wq);
|
|
}
|
|
|
|
void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn)
|
|
{
|
|
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
|
|
spin_lock(&clp->cl_lock);
|
|
memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn));
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
/*
|
|
* There's currently a single callback channel slot.
|
|
* If the slot is available, then mark it busy. Otherwise, set the
|
|
* thread for sleeping on the callback RPC wait queue.
|
|
*/
|
|
static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task)
|
|
{
|
|
if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) {
|
|
rpc_sleep_on(&clp->cl_cb_waitq, task, NULL);
|
|
dprintk("%s slot is busy\n", __func__);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* TODO: cb_sequence should support referring call lists, cachethis, multiple
|
|
* slots, and mark callback channel down on communication errors.
|
|
*/
|
|
static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfsd4_callback *cb = calldata;
|
|
struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
u32 minorversion = clp->cl_minorversion;
|
|
|
|
cb->cb_minorversion = minorversion;
|
|
if (minorversion) {
|
|
if (!nfsd41_cb_get_slot(clp, task))
|
|
return;
|
|
}
|
|
spin_lock(&clp->cl_lock);
|
|
if (list_empty(&cb->cb_per_client)) {
|
|
/* This is the first call, not a restart */
|
|
cb->cb_done = false;
|
|
list_add(&cb->cb_per_client, &clp->cl_callbacks);
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
rpc_call_start(task);
|
|
}
|
|
|
|
static void nfsd4_cb_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfsd4_callback *cb = calldata;
|
|
struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
|
|
dprintk("%s: minorversion=%d\n", __func__,
|
|
clp->cl_minorversion);
|
|
|
|
if (clp->cl_minorversion) {
|
|
/* No need for lock, access serialized in nfsd4_cb_prepare */
|
|
++clp->cl_cb_session->se_cb_seq_nr;
|
|
clear_bit(0, &clp->cl_cb_slot_busy);
|
|
rpc_wake_up_next(&clp->cl_cb_waitq);
|
|
dprintk("%s: freed slot, new seqid=%d\n", __func__,
|
|
clp->cl_cb_session->se_cb_seq_nr);
|
|
|
|
/* We're done looking into the sequence information */
|
|
task->tk_msg.rpc_resp = NULL;
|
|
}
|
|
}
|
|
|
|
|
|
static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfsd4_callback *cb = calldata;
|
|
struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
|
|
|
|
nfsd4_cb_done(task, calldata);
|
|
|
|
if (current_rpc_client != task->tk_client) {
|
|
/* We're shutting down or changing cl_cb_client; leave
|
|
* it to nfsd4_process_cb_update to restart the call if
|
|
* necessary. */
|
|
return;
|
|
}
|
|
|
|
if (cb->cb_done)
|
|
return;
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
cb->cb_done = true;
|
|
return;
|
|
case -EBADHANDLE:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
/* Race: client probably got cb_recall
|
|
* before open reply granting delegation */
|
|
break;
|
|
default:
|
|
/* Network partition? */
|
|
nfsd4_mark_cb_down(clp, task->tk_status);
|
|
}
|
|
if (dp->dl_retries--) {
|
|
rpc_delay(task, 2*HZ);
|
|
task->tk_status = 0;
|
|
rpc_restart_call_prepare(task);
|
|
return;
|
|
}
|
|
nfsd4_mark_cb_down(clp, task->tk_status);
|
|
cb->cb_done = true;
|
|
}
|
|
|
|
static void nfsd4_cb_recall_release(void *calldata)
|
|
{
|
|
struct nfsd4_callback *cb = calldata;
|
|
struct nfs4_client *clp = cb->cb_clp;
|
|
struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
|
|
|
|
if (cb->cb_done) {
|
|
spin_lock(&clp->cl_lock);
|
|
list_del(&cb->cb_per_client);
|
|
spin_unlock(&clp->cl_lock);
|
|
nfs4_put_delegation(dp);
|
|
}
|
|
}
|
|
|
|
static const struct rpc_call_ops nfsd4_cb_recall_ops = {
|
|
.rpc_call_prepare = nfsd4_cb_prepare,
|
|
.rpc_call_done = nfsd4_cb_recall_done,
|
|
.rpc_release = nfsd4_cb_recall_release,
|
|
};
|
|
|
|
int nfsd4_create_callback_queue(void)
|
|
{
|
|
callback_wq = create_singlethread_workqueue("nfsd4_callbacks");
|
|
if (!callback_wq)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
void nfsd4_destroy_callback_queue(void)
|
|
{
|
|
destroy_workqueue(callback_wq);
|
|
}
|
|
|
|
/* must be called under the state lock */
|
|
void nfsd4_shutdown_callback(struct nfs4_client *clp)
|
|
{
|
|
set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags);
|
|
/*
|
|
* Note this won't actually result in a null callback;
|
|
* instead, nfsd4_do_callback_rpc() will detect the killed
|
|
* client, destroy the rpc client, and stop:
|
|
*/
|
|
do_probe_callback(clp);
|
|
flush_workqueue(callback_wq);
|
|
}
|
|
|
|
static void nfsd4_release_cb(struct nfsd4_callback *cb)
|
|
{
|
|
if (cb->cb_ops->rpc_release)
|
|
cb->cb_ops->rpc_release(cb);
|
|
}
|
|
|
|
/* requires cl_lock: */
|
|
static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp)
|
|
{
|
|
struct nfsd4_session *s;
|
|
struct nfsd4_conn *c;
|
|
|
|
list_for_each_entry(s, &clp->cl_sessions, se_perclnt) {
|
|
list_for_each_entry(c, &s->se_conns, cn_persession) {
|
|
if (c->cn_flags & NFS4_CDFC4_BACK)
|
|
return c;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void nfsd4_process_cb_update(struct nfsd4_callback *cb)
|
|
{
|
|
struct nfs4_cb_conn conn;
|
|
struct nfs4_client *clp = cb->cb_clp;
|
|
struct nfsd4_session *ses = NULL;
|
|
struct nfsd4_conn *c;
|
|
int err;
|
|
|
|
/*
|
|
* This is either an update, or the client dying; in either case,
|
|
* kill the old client:
|
|
*/
|
|
if (clp->cl_cb_client) {
|
|
rpc_shutdown_client(clp->cl_cb_client);
|
|
clp->cl_cb_client = NULL;
|
|
}
|
|
if (clp->cl_cb_conn.cb_xprt) {
|
|
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
|
|
clp->cl_cb_conn.cb_xprt = NULL;
|
|
}
|
|
if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags))
|
|
return;
|
|
spin_lock(&clp->cl_lock);
|
|
/*
|
|
* Only serialized callback code is allowed to clear these
|
|
* flags; main nfsd code can only set them:
|
|
*/
|
|
BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK));
|
|
clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags);
|
|
memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn));
|
|
c = __nfsd4_find_backchannel(clp);
|
|
if (c) {
|
|
svc_xprt_get(c->cn_xprt);
|
|
conn.cb_xprt = c->cn_xprt;
|
|
ses = c->cn_session;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
|
|
err = setup_callback_client(clp, &conn, ses);
|
|
if (err) {
|
|
nfsd4_mark_cb_down(clp, err);
|
|
return;
|
|
}
|
|
/* Yay, the callback channel's back! Restart any callbacks: */
|
|
list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client)
|
|
run_nfsd4_cb(cb);
|
|
}
|
|
|
|
void nfsd4_do_callback_rpc(struct work_struct *w)
|
|
{
|
|
struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work);
|
|
struct nfs4_client *clp = cb->cb_clp;
|
|
struct rpc_clnt *clnt;
|
|
|
|
if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)
|
|
nfsd4_process_cb_update(cb);
|
|
|
|
clnt = clp->cl_cb_client;
|
|
if (!clnt) {
|
|
/* Callback channel broken, or client killed; give up: */
|
|
nfsd4_release_cb(cb);
|
|
return;
|
|
}
|
|
rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
|
|
cb->cb_ops, cb);
|
|
}
|
|
|
|
void nfsd4_cb_recall(struct nfs4_delegation *dp)
|
|
{
|
|
struct nfsd4_callback *cb = &dp->dl_recall;
|
|
struct nfs4_client *clp = dp->dl_stid.sc_client;
|
|
|
|
dp->dl_retries = 1;
|
|
cb->cb_op = dp;
|
|
cb->cb_clp = clp;
|
|
cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL];
|
|
cb->cb_msg.rpc_argp = cb;
|
|
cb->cb_msg.rpc_resp = cb;
|
|
cb->cb_msg.rpc_cred = callback_cred;
|
|
|
|
cb->cb_ops = &nfsd4_cb_recall_ops;
|
|
dp->dl_retries = 1;
|
|
|
|
INIT_LIST_HEAD(&cb->cb_per_client);
|
|
cb->cb_done = true;
|
|
|
|
run_nfsd4_cb(&dp->dl_recall);
|
|
}
|