508 lines
14 KiB
C
508 lines
14 KiB
C
/*
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* linux/fs/nfsd/nfs4callback.c
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*
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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/module.h>
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#include <linux/list.h>
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#include <linux/inet.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/kthread.h>
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#include <linux/sunrpc/xdr.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/state.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/nfs4.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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};
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enum nfs_cb_opnum4 {
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OP_CB_RECALL = 4,
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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 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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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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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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int status;
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u32 ident;
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u32 nops;
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u32 taglen;
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char * tag;
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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 int
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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(NFS4_MINOR_VERSION);
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WRITE32(hdr->ident);
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WRITE32(hdr->nops);
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return 0;
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}
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static int
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encode_cb_recall(struct xdr_stream *xdr, struct nfs4_cb_recall *cb_rec)
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{
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__be32 *p;
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int len = cb_rec->cbr_fh.fh_size;
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RESERVE_SPACE(12+sizeof(cb_rec->cbr_stateid) + len);
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WRITE32(OP_CB_RECALL);
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WRITE32(cb_rec->cbr_stateid.si_generation);
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WRITEMEM(&cb_rec->cbr_stateid.si_opaque, sizeof(stateid_opaque_t));
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WRITE32(cb_rec->cbr_trunc);
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WRITE32(len);
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WRITEMEM(&cb_rec->cbr_fh.fh_base, len);
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return 0;
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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, struct nfs4_cb_recall *args)
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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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.ident = args->cbr_ident,
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.nops = 1,
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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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return (encode_cb_recall(&xdr, args));
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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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READ_BUF(8);
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READ32(hdr->status);
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READ32(hdr->taglen);
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READ_BUF(hdr->taglen + 4);
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hdr->tag = (char *)p;
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p += XDR_QUADLEN(hdr->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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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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{
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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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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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*/
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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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};
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static struct rpc_version nfs_cb_version4 = {
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.number = 1,
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.nrprocs = ARRAY_SIZE(nfs4_cb_procedures),
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.procs = nfs4_cb_procedures
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};
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static struct rpc_version * nfs_cb_version[] = {
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NULL,
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&nfs_cb_version4,
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};
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static struct rpc_program cb_program;
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static struct rpc_stat cb_stats = {
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.program = &cb_program
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};
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#define NFS4_CALLBACK 0x40000000
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static struct rpc_program cb_program = {
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.name = "nfs4_cb",
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.number = NFS4_CALLBACK,
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.nrvers = ARRAY_SIZE(nfs_cb_version),
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.version = nfs_cb_version,
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.stats = &cb_stats,
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.pipe_dir_name = "/nfsd4_cb",
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};
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/* Reference counting, callback cleanup, etc., all look racy as heck.
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* And why is cb_set an atomic? */
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static struct rpc_clnt *setup_callback_client(struct nfs4_client *clp)
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{
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struct sockaddr_in addr;
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struct nfs4_callback *cb = &clp->cl_callback;
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struct rpc_timeout timeparms = {
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.to_initval = (NFSD_LEASE_TIME/4) * HZ,
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.to_retries = 5,
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.to_maxval = (NFSD_LEASE_TIME/2) * HZ,
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.to_exponential = 1,
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};
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struct rpc_create_args args = {
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.protocol = IPPROTO_TCP,
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.address = (struct sockaddr *)&addr,
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.addrsize = sizeof(addr),
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.timeout = &timeparms,
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.program = &cb_program,
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.prognumber = cb->cb_prog,
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.version = nfs_cb_version[1]->number,
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.authflavor = clp->cl_flavor,
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.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET),
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.client_name = clp->cl_principal,
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};
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struct rpc_clnt *client;
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if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5))
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return ERR_PTR(-EINVAL);
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/* Initialize address */
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(cb->cb_port);
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addr.sin_addr.s_addr = htonl(cb->cb_addr);
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/* Create RPC client */
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client = rpc_create(&args);
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if (IS_ERR(client))
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dprintk("NFSD: couldn't create callback client: %ld\n",
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PTR_ERR(client));
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return client;
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}
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static int do_probe_callback(void *data)
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{
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struct nfs4_client *clp = data;
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struct nfs4_callback *cb = &clp->cl_callback;
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struct rpc_message msg = {
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.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL],
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.rpc_argp = clp,
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};
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struct rpc_clnt *client;
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int status;
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client = setup_callback_client(clp);
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if (IS_ERR(client)) {
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status = PTR_ERR(client);
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dprintk("NFSD: couldn't create callback client: %d\n",
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status);
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goto out_err;
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}
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status = rpc_call_sync(client, &msg, RPC_TASK_SOFT);
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if (status)
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goto out_release_client;
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cb->cb_client = client;
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atomic_set(&cb->cb_set, 1);
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put_nfs4_client(clp);
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return 0;
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out_release_client:
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rpc_shutdown_client(client);
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out_err:
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dprintk("NFSD: warning: no callback path to client %.*s: error %d\n",
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(int)clp->cl_name.len, clp->cl_name.data, status);
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put_nfs4_client(clp);
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return 0;
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}
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/*
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* Set up the callback client and put a NFSPROC4_CB_NULL on the wire...
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*/
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void
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nfsd4_probe_callback(struct nfs4_client *clp)
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{
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struct task_struct *t;
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BUG_ON(atomic_read(&clp->cl_callback.cb_set));
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/* the task holds a reference to the nfs4_client struct */
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atomic_inc(&clp->cl_count);
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t = kthread_run(do_probe_callback, clp, "nfs4_cb_probe");
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if (IS_ERR(t))
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atomic_dec(&clp->cl_count);
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return;
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}
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/*
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* called with dp->dl_count inc'ed.
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*/
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void
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nfsd4_cb_recall(struct nfs4_delegation *dp)
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{
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struct nfs4_client *clp = dp->dl_client;
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struct rpc_clnt *clnt = clp->cl_callback.cb_client;
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struct nfs4_cb_recall *cbr = &dp->dl_recall;
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struct rpc_message msg = {
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.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL],
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.rpc_argp = cbr,
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};
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int retries = 1;
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int status = 0;
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cbr->cbr_trunc = 0; /* XXX need to implement truncate optimization */
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cbr->cbr_dp = dp;
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status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
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while (retries--) {
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switch (status) {
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case -EIO:
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/* Network partition? */
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atomic_set(&clp->cl_callback.cb_set, 0);
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case -EBADHANDLE:
|
|
case -NFS4ERR_BAD_STATEID:
|
|
/* Race: client probably got cb_recall
|
|
* before open reply granting delegation */
|
|
break;
|
|
default:
|
|
goto out_put_cred;
|
|
}
|
|
ssleep(2);
|
|
status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFT);
|
|
}
|
|
out_put_cred:
|
|
/*
|
|
* Success or failure, now we're either waiting for lease expiration
|
|
* or deleg_return.
|
|
*/
|
|
put_nfs4_client(clp);
|
|
nfs4_put_delegation(dp);
|
|
return;
|
|
}
|