forked from luck/tmp_suning_uos_patched
229b2a0839
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
869 lines
23 KiB
C
869 lines
23 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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#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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enum nfs_cb_opnum4 {
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OP_CB_RECALL = 4,
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OP_CB_SEQUENCE = 11,
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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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/*
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* Generic encode routines from fs/nfs/nfs4xdr.c
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*/
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static inline __be32 *
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xdr_writemem(__be32 *p, const void *ptr, int nbytes)
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{
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int tmp = XDR_QUADLEN(nbytes);
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if (!tmp)
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return p;
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p[tmp-1] = 0;
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memcpy(p, ptr, nbytes);
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return p + tmp;
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}
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#define WRITE32(n) *p++ = htonl(n)
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#define WRITEMEM(ptr,nbytes) do { \
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p = xdr_writemem(p, ptr, nbytes); \
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} while (0)
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#define RESERVE_SPACE(nbytes) do { \
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p = xdr_reserve_space(xdr, nbytes); \
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if (!p) dprintk("NFSD: RESERVE_SPACE(%d) failed in function %s\n", (int) (nbytes), __func__); \
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BUG_ON(!p); \
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} while (0)
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/*
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* Generic decode routines from fs/nfs/nfs4xdr.c
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*/
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#define DECODE_TAIL \
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status = 0; \
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out: \
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return status; \
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xdr_error: \
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dprintk("NFSD: xdr error! (%s:%d)\n", __FILE__, __LINE__); \
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status = -EIO; \
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goto out
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#define READ32(x) (x) = ntohl(*p++)
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#define READ64(x) do { \
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(x) = (u64)ntohl(*p++) << 32; \
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(x) |= ntohl(*p++); \
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} while (0)
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#define READTIME(x) do { \
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p++; \
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(x.tv_sec) = ntohl(*p++); \
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(x.tv_nsec) = ntohl(*p++); \
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} while (0)
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#define READ_BUF(nbytes) do { \
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p = xdr_inline_decode(xdr, nbytes); \
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if (!p) { \
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dprintk("NFSD: %s: reply buffer overflowed in line %d.\n", \
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__func__, __LINE__); \
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return -EIO; \
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} \
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} while (0)
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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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static 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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static int
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nfs_cb_stat_to_errno(int stat)
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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 == stat)
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return nfs_cb_errtbl[i].errno;
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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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* 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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return stat;
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}
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/*
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* XDR encode
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*/
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static void
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encode_stateid(struct xdr_stream *xdr, stateid_t *sid)
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{
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__be32 *p;
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RESERVE_SPACE(sizeof(stateid_t));
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WRITE32(sid->si_generation);
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WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
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}
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static void
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encode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr)
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{
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__be32 * p;
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RESERVE_SPACE(16);
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WRITE32(0); /* tag length is always 0 */
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WRITE32(hdr->minorversion);
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WRITE32(hdr->ident);
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hdr->nops_p = p;
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WRITE32(hdr->nops);
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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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*hdr->nops_p = htonl(hdr->nops);
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}
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static void
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encode_cb_recall(struct xdr_stream *xdr, 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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int len = dp->dl_fh.fh_size;
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RESERVE_SPACE(4);
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WRITE32(OP_CB_RECALL);
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encode_stateid(xdr, &dp->dl_stateid);
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RESERVE_SPACE(8 + (XDR_QUADLEN(len) << 2));
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WRITE32(0); /* truncate optimization not implemented */
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WRITE32(len);
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WRITEMEM(&dp->dl_fh.fh_base, len);
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hdr->nops++;
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}
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static void
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encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
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struct nfs4_cb_compound_hdr *hdr)
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{
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__be32 *p;
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struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
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if (hdr->minorversion == 0)
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return;
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RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20);
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WRITE32(OP_CB_SEQUENCE);
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WRITEMEM(ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN);
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WRITE32(ses->se_cb_seq_nr);
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WRITE32(0); /* slotid, always 0 */
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WRITE32(0); /* highest slotid always 0 */
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WRITE32(0); /* cachethis always 0 */
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WRITE32(0); /* FIXME: support referring_call_lists */
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hdr->nops++;
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}
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static int
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nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p)
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{
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struct xdr_stream xdrs, *xdr = &xdrs;
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xdr_init_encode(&xdrs, &req->rq_snd_buf, p);
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RESERVE_SPACE(0);
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return 0;
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}
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static int
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nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, __be32 *p,
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struct nfsd4_callback *cb)
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{
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struct xdr_stream xdr;
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struct nfs4_delegation *args = cb->cb_op;
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struct nfs4_cb_compound_hdr hdr = {
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.ident = cb->cb_clp->cl_cb_ident,
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.minorversion = cb->cb_minorversion,
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};
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xdr_init_encode(&xdr, &req->rq_snd_buf, p);
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encode_cb_compound_hdr(&xdr, &hdr);
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encode_cb_sequence(&xdr, cb, &hdr);
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encode_cb_recall(&xdr, args, &hdr);
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encode_cb_nops(&hdr);
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return 0;
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}
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static int
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decode_cb_compound_hdr(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr){
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__be32 *p;
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u32 taglen;
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READ_BUF(8);
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READ32(hdr->status);
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/* We've got no use for the tag; ignore it: */
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READ32(taglen);
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READ_BUF(taglen + 4);
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p += XDR_QUADLEN(taglen);
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READ32(hdr->nops);
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return 0;
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}
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static int
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decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected)
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{
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__be32 *p;
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u32 op;
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int32_t nfserr;
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READ_BUF(8);
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READ32(op);
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if (op != expected) {
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dprintk("NFSD: decode_cb_op_hdr: Callback server returned "
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" operation %d but we issued a request for %d\n",
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op, expected);
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return -EIO;
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}
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READ32(nfserr);
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if (nfserr != NFS_OK)
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return -nfs_cb_stat_to_errno(nfserr);
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return 0;
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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
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decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_callback *cb,
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struct rpc_rqst *rqstp)
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{
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struct nfsd4_session *ses = cb->cb_clp->cl_cb_session;
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struct nfs4_sessionid id;
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int status;
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u32 dummy;
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__be32 *p;
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if (cb->cb_minorversion == 0)
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return 0;
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status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE);
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if (status)
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return status;
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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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status = -ESERVERFAULT;
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READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
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memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN);
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p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN);
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if (memcmp(id.data, ses->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) {
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dprintk("%s Invalid session id\n", __func__);
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goto out;
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}
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READ32(dummy);
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if (dummy != ses->se_cb_seq_nr) {
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dprintk("%s Invalid sequence number\n", __func__);
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goto out;
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}
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READ32(dummy); /* slotid must be 0 */
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if (dummy != 0) {
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dprintk("%s Invalid slotid\n", __func__);
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goto out;
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}
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/* FIXME: process highest slotid and target highest slotid */
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status = 0;
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out:
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return status;
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}
|
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|
|
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static int
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nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p)
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{
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return 0;
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}
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static int
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nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, __be32 *p,
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struct nfsd4_callback *cb)
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{
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struct xdr_stream xdr;
|
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struct nfs4_cb_compound_hdr hdr;
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int status;
|
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xdr_init_decode(&xdr, &rqstp->rq_rcv_buf, p);
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status = decode_cb_compound_hdr(&xdr, &hdr);
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if (status)
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goto out;
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if (cb) {
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status = decode_cb_sequence(&xdr, cb, rqstp);
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if (status)
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goto out;
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}
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status = decode_cb_op_hdr(&xdr, OP_CB_RECALL);
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out:
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return status;
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}
|
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|
|
/*
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* RPC procedure tables
|
|
*/
|
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#define PROC(proc, call, argtype, restype) \
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[NFSPROC4_CLNT_##proc] = { \
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.p_proc = NFSPROC4_CB_##call, \
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.p_encode = (kxdrproc_t) nfs4_xdr_##argtype, \
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.p_decode = (kxdrproc_t) nfs4_xdr_##restype, \
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.p_arglen = NFS4_##argtype##_sz, \
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.p_replen = NFS4_##restype##_sz, \
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.p_statidx = NFSPROC4_CB_##call, \
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.p_name = #proc, \
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}
|
|
|
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static struct rpc_procinfo nfs4_cb_procedures[] = {
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PROC(CB_NULL, NULL, enc_cb_null, dec_cb_null),
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PROC(CB_RECALL, COMPOUND, enc_cb_recall, dec_cb_recall),
|
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};
|
|
|
|
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 struct rpc_version * nfs_cb_version[] = {
|
|
&nfs_cb_version4,
|
|
};
|
|
|
|
static struct rpc_program cb_program;
|
|
|
|
static struct rpc_stat cb_stats = {
|
|
.program = &cb_program
|
|
};
|
|
|
|
#define NFS4_CALLBACK 0x40000000
|
|
static 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,
|
|
.authflavor = clp->cl_flavor,
|
|
.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
|
|
};
|
|
struct rpc_clnt *client;
|
|
|
|
if (clp->cl_minorversion == 0) {
|
|
if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
|
|
return -EINVAL;
|
|
args.client_name = clp->cl_principal;
|
|
args.prognumber = conn->cb_prog,
|
|
args.protocol = XPRT_TRANSPORT_TCP;
|
|
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;
|
|
}
|
|
/* 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_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();
|
|
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)
|
|
{
|
|
/* XXX: atomicity? Also, should we be using cl_cb_flags? */
|
|
clp->cl_cb_state = NFSD4_CB_UNKNOWN;
|
|
set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_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 int nfsd41_cb_setup_sequence(struct nfs4_client *clp,
|
|
struct rpc_task *task)
|
|
{
|
|
u32 *ptr = (u32 *)clp->cl_cb_session->se_sessionid.data;
|
|
int status = 0;
|
|
|
|
dprintk("%s: %u:%u:%u:%u\n", __func__,
|
|
ptr[0], ptr[1], ptr[2], ptr[3]);
|
|
|
|
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__);
|
|
status = -EAGAIN;
|
|
goto out;
|
|
}
|
|
out:
|
|
dprintk("%s status=%d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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_client;
|
|
u32 minorversion = clp->cl_minorversion;
|
|
int status = 0;
|
|
|
|
cb->cb_minorversion = minorversion;
|
|
if (minorversion) {
|
|
status = nfsd41_cb_setup_sequence(clp, task);
|
|
if (status) {
|
|
if (status != -EAGAIN) {
|
|
/* terminate rpc task */
|
|
task->tk_status = status;
|
|
task->tk_action = NULL;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
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_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_client;
|
|
struct rpc_clnt *current_rpc_client = clp->cl_cb_client;
|
|
|
|
nfsd4_cb_done(task, calldata);
|
|
|
|
if (current_rpc_client == NULL) {
|
|
/* We're shutting down; give up. */
|
|
/* XXX: err, or is it ok just to fall through
|
|
* and rpc_restart_call? */
|
|
return;
|
|
}
|
|
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
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 (current_rpc_client != task->tk_client) {
|
|
/* queue a callback on the new connection: */
|
|
atomic_inc(&dp->dl_count);
|
|
nfsd4_cb_recall(dp);
|
|
return;
|
|
}
|
|
}
|
|
if (dp->dl_retries--) {
|
|
rpc_delay(task, 2*HZ);
|
|
task->tk_status = 0;
|
|
rpc_restart_call_prepare(task);
|
|
return;
|
|
} else
|
|
nfsd4_mark_cb_down(clp, task->tk_status);
|
|
}
|
|
|
|
static void nfsd4_cb_recall_release(void *calldata)
|
|
{
|
|
struct nfsd4_callback *cb = calldata;
|
|
struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall);
|
|
|
|
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_KILL, &clp->cl_cb_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_KILL, &clp->cl_cb_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_cb_flags);
|
|
clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_cb_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)
|
|
warn_no_callback_path(clp, err);
|
|
}
|
|
|
|
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_cb_flags)
|
|
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;
|
|
|
|
dp->dl_retries = 1;
|
|
cb->cb_op = dp;
|
|
cb->cb_clp = dp->dl_client;
|
|
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;
|
|
|
|
run_nfsd4_cb(&dp->dl_recall);
|
|
}
|