mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1381 lines
34 KiB
1381 lines
34 KiB
/* |
|
* Copyright (c) 2001 The Regents of the University of Michigan. |
|
* All rights reserved. |
|
* |
|
* Kendrick Smith <[email protected]> |
|
* Andy Adamson <[email protected]> |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
|
* |
|
* 1. Redistributions of source code must retain the above copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in the |
|
* documentation and/or other materials provided with the distribution. |
|
* 3. Neither the name of the University nor the names of its |
|
* contributors may be used to endorse or promote products derived |
|
* from this software without specific prior written permission. |
|
* |
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
|
*/ |
|
|
|
#include <linux/sunrpc/clnt.h> |
|
#include <linux/sunrpc/xprt.h> |
|
#include <linux/sunrpc/svc_xprt.h> |
|
#include <linux/slab.h> |
|
#include "nfsd.h" |
|
#include "state.h" |
|
#include "netns.h" |
|
#include "trace.h" |
|
#include "xdr4cb.h" |
|
#include "xdr4.h" |
|
|
|
#define NFSDDBG_FACILITY NFSDDBG_PROC |
|
|
|
static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); |
|
|
|
#define NFSPROC4_CB_NULL 0 |
|
#define NFSPROC4_CB_COMPOUND 1 |
|
|
|
/* Index of predefined Linux callback client operations */ |
|
|
|
struct nfs4_cb_compound_hdr { |
|
/* args */ |
|
u32 ident; /* minorversion 0 only */ |
|
u32 nops; |
|
__be32 *nops_p; |
|
u32 minorversion; |
|
/* res */ |
|
int status; |
|
}; |
|
|
|
static __be32 *xdr_encode_empty_array(__be32 *p) |
|
{ |
|
*p++ = xdr_zero; |
|
return p; |
|
} |
|
|
|
/* |
|
* Encode/decode NFSv4 CB basic data types |
|
* |
|
* Basic NFSv4 callback data 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" |
|
*/ |
|
|
|
/* |
|
* nfs_cb_opnum4 |
|
* |
|
* enum nfs_cb_opnum4 { |
|
* OP_CB_GETATTR = 3, |
|
* ... |
|
* }; |
|
*/ |
|
enum nfs_cb_opnum4 { |
|
OP_CB_GETATTR = 3, |
|
OP_CB_RECALL = 4, |
|
OP_CB_LAYOUTRECALL = 5, |
|
OP_CB_NOTIFY = 6, |
|
OP_CB_PUSH_DELEG = 7, |
|
OP_CB_RECALL_ANY = 8, |
|
OP_CB_RECALLABLE_OBJ_AVAIL = 9, |
|
OP_CB_RECALL_SLOT = 10, |
|
OP_CB_SEQUENCE = 11, |
|
OP_CB_WANTS_CANCELLED = 12, |
|
OP_CB_NOTIFY_LOCK = 13, |
|
OP_CB_NOTIFY_DEVICEID = 14, |
|
OP_CB_OFFLOAD = 15, |
|
OP_CB_ILLEGAL = 10044 |
|
}; |
|
|
|
static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, 4); |
|
*p = cpu_to_be32(op); |
|
} |
|
|
|
/* |
|
* nfs_fh4 |
|
* |
|
* typedef opaque nfs_fh4<NFS4_FHSIZE>; |
|
*/ |
|
static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) |
|
{ |
|
u32 length = fh->fh_size; |
|
__be32 *p; |
|
|
|
BUG_ON(length > NFS4_FHSIZE); |
|
p = xdr_reserve_space(xdr, 4 + length); |
|
xdr_encode_opaque(p, &fh->fh_base, length); |
|
} |
|
|
|
/* |
|
* stateid4 |
|
* |
|
* struct stateid4 { |
|
* uint32_t seqid; |
|
* opaque other[12]; |
|
* }; |
|
*/ |
|
static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); |
|
*p++ = cpu_to_be32(sid->si_generation); |
|
xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); |
|
} |
|
|
|
/* |
|
* sessionid4 |
|
* |
|
* typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; |
|
*/ |
|
static void encode_sessionid4(struct xdr_stream *xdr, |
|
const struct nfsd4_session *session) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); |
|
xdr_encode_opaque_fixed(p, session->se_sessionid.data, |
|
NFS4_MAX_SESSIONID_LEN); |
|
} |
|
|
|
/* |
|
* nfsstat4 |
|
*/ |
|
static const struct { |
|
int stat; |
|
int errno; |
|
} nfs_cb_errtbl[] = { |
|
{ NFS4_OK, 0 }, |
|
{ NFS4ERR_PERM, -EPERM }, |
|
{ NFS4ERR_NOENT, -ENOENT }, |
|
{ NFS4ERR_IO, -EIO }, |
|
{ NFS4ERR_NXIO, -ENXIO }, |
|
{ NFS4ERR_ACCESS, -EACCES }, |
|
{ NFS4ERR_EXIST, -EEXIST }, |
|
{ NFS4ERR_XDEV, -EXDEV }, |
|
{ NFS4ERR_NOTDIR, -ENOTDIR }, |
|
{ NFS4ERR_ISDIR, -EISDIR }, |
|
{ NFS4ERR_INVAL, -EINVAL }, |
|
{ NFS4ERR_FBIG, -EFBIG }, |
|
{ NFS4ERR_NOSPC, -ENOSPC }, |
|
{ NFS4ERR_ROFS, -EROFS }, |
|
{ NFS4ERR_MLINK, -EMLINK }, |
|
{ NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, |
|
{ NFS4ERR_NOTEMPTY, -ENOTEMPTY }, |
|
{ NFS4ERR_DQUOT, -EDQUOT }, |
|
{ NFS4ERR_STALE, -ESTALE }, |
|
{ NFS4ERR_BADHANDLE, -EBADHANDLE }, |
|
{ NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, |
|
{ NFS4ERR_NOTSUPP, -ENOTSUPP }, |
|
{ NFS4ERR_TOOSMALL, -ETOOSMALL }, |
|
{ NFS4ERR_SERVERFAULT, -ESERVERFAULT }, |
|
{ NFS4ERR_BADTYPE, -EBADTYPE }, |
|
{ NFS4ERR_LOCKED, -EAGAIN }, |
|
{ NFS4ERR_RESOURCE, -EREMOTEIO }, |
|
{ NFS4ERR_SYMLINK, -ELOOP }, |
|
{ NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, |
|
{ NFS4ERR_DEADLOCK, -EDEADLK }, |
|
{ -1, -EIO } |
|
}; |
|
|
|
/* |
|
* If we cannot translate the error, the recovery routines should |
|
* handle it. |
|
* |
|
* Note: remaining NFSv4 error codes have values > 10000, so should |
|
* not conflict with native Linux error codes. |
|
*/ |
|
static int nfs_cb_stat_to_errno(int status) |
|
{ |
|
int i; |
|
|
|
for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { |
|
if (nfs_cb_errtbl[i].stat == status) |
|
return nfs_cb_errtbl[i].errno; |
|
} |
|
|
|
dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); |
|
return -status; |
|
} |
|
|
|
static int decode_cb_op_status(struct xdr_stream *xdr, |
|
enum nfs_cb_opnum4 expected, int *status) |
|
{ |
|
__be32 *p; |
|
u32 op; |
|
|
|
p = xdr_inline_decode(xdr, 4 + 4); |
|
if (unlikely(p == NULL)) |
|
goto out_overflow; |
|
op = be32_to_cpup(p++); |
|
if (unlikely(op != expected)) |
|
goto out_unexpected; |
|
*status = nfs_cb_stat_to_errno(be32_to_cpup(p)); |
|
return 0; |
|
out_overflow: |
|
return -EIO; |
|
out_unexpected: |
|
dprintk("NFSD: Callback server returned operation %d but " |
|
"we issued a request for %d\n", op, expected); |
|
return -EIO; |
|
} |
|
|
|
/* |
|
* CB_COMPOUND4args |
|
* |
|
* struct CB_COMPOUND4args { |
|
* utf8str_cs tag; |
|
* uint32_t minorversion; |
|
* uint32_t callback_ident; |
|
* nfs_cb_argop4 argarray<>; |
|
* }; |
|
*/ |
|
static void encode_cb_compound4args(struct xdr_stream *xdr, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
__be32 * p; |
|
|
|
p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); |
|
p = xdr_encode_empty_array(p); /* empty tag */ |
|
*p++ = cpu_to_be32(hdr->minorversion); |
|
*p++ = cpu_to_be32(hdr->ident); |
|
|
|
hdr->nops_p = p; |
|
*p = cpu_to_be32(hdr->nops); /* argarray element count */ |
|
} |
|
|
|
/* |
|
* Update argarray element count |
|
*/ |
|
static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); |
|
*hdr->nops_p = cpu_to_be32(hdr->nops); |
|
} |
|
|
|
/* |
|
* CB_COMPOUND4res |
|
* |
|
* struct CB_COMPOUND4res { |
|
* nfsstat4 status; |
|
* utf8str_cs tag; |
|
* nfs_cb_resop4 resarray<>; |
|
* }; |
|
*/ |
|
static int decode_cb_compound4res(struct xdr_stream *xdr, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
u32 length; |
|
__be32 *p; |
|
|
|
p = xdr_inline_decode(xdr, 4 + 4); |
|
if (unlikely(p == NULL)) |
|
goto out_overflow; |
|
hdr->status = be32_to_cpup(p++); |
|
/* Ignore the tag */ |
|
length = be32_to_cpup(p++); |
|
p = xdr_inline_decode(xdr, length + 4); |
|
if (unlikely(p == NULL)) |
|
goto out_overflow; |
|
p += XDR_QUADLEN(length); |
|
hdr->nops = be32_to_cpup(p); |
|
return 0; |
|
out_overflow: |
|
return -EIO; |
|
} |
|
|
|
/* |
|
* CB_RECALL4args |
|
* |
|
* struct CB_RECALL4args { |
|
* stateid4 stateid; |
|
* bool truncate; |
|
* nfs_fh4 fh; |
|
* }; |
|
*/ |
|
static void encode_cb_recall4args(struct xdr_stream *xdr, |
|
const struct nfs4_delegation *dp, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
__be32 *p; |
|
|
|
encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); |
|
encode_stateid4(xdr, &dp->dl_stid.sc_stateid); |
|
|
|
p = xdr_reserve_space(xdr, 4); |
|
*p++ = xdr_zero; /* truncate */ |
|
|
|
encode_nfs_fh4(xdr, &dp->dl_stid.sc_file->fi_fhandle); |
|
|
|
hdr->nops++; |
|
} |
|
|
|
/* |
|
* CB_SEQUENCE4args |
|
* |
|
* struct CB_SEQUENCE4args { |
|
* sessionid4 csa_sessionid; |
|
* sequenceid4 csa_sequenceid; |
|
* slotid4 csa_slotid; |
|
* slotid4 csa_highest_slotid; |
|
* bool csa_cachethis; |
|
* referring_call_list4 csa_referring_call_lists<>; |
|
* }; |
|
*/ |
|
static void encode_cb_sequence4args(struct xdr_stream *xdr, |
|
const struct nfsd4_callback *cb, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
|
__be32 *p; |
|
|
|
if (hdr->minorversion == 0) |
|
return; |
|
|
|
encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); |
|
encode_sessionid4(xdr, session); |
|
|
|
p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); |
|
*p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ |
|
*p++ = xdr_zero; /* csa_slotid */ |
|
*p++ = xdr_zero; /* csa_highest_slotid */ |
|
*p++ = xdr_zero; /* csa_cachethis */ |
|
xdr_encode_empty_array(p); /* csa_referring_call_lists */ |
|
|
|
hdr->nops++; |
|
} |
|
|
|
/* |
|
* CB_SEQUENCE4resok |
|
* |
|
* struct CB_SEQUENCE4resok { |
|
* sessionid4 csr_sessionid; |
|
* sequenceid4 csr_sequenceid; |
|
* slotid4 csr_slotid; |
|
* slotid4 csr_highest_slotid; |
|
* slotid4 csr_target_highest_slotid; |
|
* }; |
|
* |
|
* union CB_SEQUENCE4res switch (nfsstat4 csr_status) { |
|
* case NFS4_OK: |
|
* CB_SEQUENCE4resok csr_resok4; |
|
* default: |
|
* void; |
|
* }; |
|
* |
|
* Our current back channel implmentation supports a single backchannel |
|
* with a single slot. |
|
*/ |
|
static int decode_cb_sequence4resok(struct xdr_stream *xdr, |
|
struct nfsd4_callback *cb) |
|
{ |
|
struct nfsd4_session *session = cb->cb_clp->cl_cb_session; |
|
int status = -ESERVERFAULT; |
|
__be32 *p; |
|
u32 dummy; |
|
|
|
/* |
|
* If the server returns different values for sessionID, slotID or |
|
* sequence number, the server is looney tunes. |
|
*/ |
|
p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); |
|
if (unlikely(p == NULL)) |
|
goto out_overflow; |
|
|
|
if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) { |
|
dprintk("NFS: %s Invalid session id\n", __func__); |
|
goto out; |
|
} |
|
p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); |
|
|
|
dummy = be32_to_cpup(p++); |
|
if (dummy != session->se_cb_seq_nr) { |
|
dprintk("NFS: %s Invalid sequence number\n", __func__); |
|
goto out; |
|
} |
|
|
|
dummy = be32_to_cpup(p++); |
|
if (dummy != 0) { |
|
dprintk("NFS: %s Invalid slotid\n", __func__); |
|
goto out; |
|
} |
|
|
|
/* |
|
* FIXME: process highest slotid and target highest slotid |
|
*/ |
|
status = 0; |
|
out: |
|
cb->cb_seq_status = status; |
|
return status; |
|
out_overflow: |
|
status = -EIO; |
|
goto out; |
|
} |
|
|
|
static int decode_cb_sequence4res(struct xdr_stream *xdr, |
|
struct nfsd4_callback *cb) |
|
{ |
|
int status; |
|
|
|
if (cb->cb_clp->cl_minorversion == 0) |
|
return 0; |
|
|
|
status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status); |
|
if (unlikely(status || cb->cb_seq_status)) |
|
return status; |
|
|
|
return decode_cb_sequence4resok(xdr, cb); |
|
} |
|
|
|
/* |
|
* 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, |
|
const 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 void *data) |
|
{ |
|
const struct nfsd4_callback *cb = data; |
|
const struct nfs4_delegation *dp = cb_to_delegation(cb); |
|
struct nfs4_cb_compound_hdr hdr = { |
|
.ident = cb->cb_clp->cl_cb_ident, |
|
.minorversion = cb->cb_clp->cl_minorversion, |
|
}; |
|
|
|
encode_cb_compound4args(xdr, &hdr); |
|
encode_cb_sequence4args(xdr, cb, &hdr); |
|
encode_cb_recall4args(xdr, dp, &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, |
|
void *data) |
|
{ |
|
struct nfsd4_callback *cb = data; |
|
struct nfs4_cb_compound_hdr hdr; |
|
int status; |
|
|
|
status = decode_cb_compound4res(xdr, &hdr); |
|
if (unlikely(status)) |
|
return status; |
|
|
|
status = decode_cb_sequence4res(xdr, cb); |
|
if (unlikely(status || cb->cb_seq_status)) |
|
return status; |
|
|
|
return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status); |
|
} |
|
|
|
#ifdef CONFIG_NFSD_PNFS |
|
/* |
|
* CB_LAYOUTRECALL4args |
|
* |
|
* struct layoutrecall_file4 { |
|
* nfs_fh4 lor_fh; |
|
* offset4 lor_offset; |
|
* length4 lor_length; |
|
* stateid4 lor_stateid; |
|
* }; |
|
* |
|
* union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { |
|
* case LAYOUTRECALL4_FILE: |
|
* layoutrecall_file4 lor_layout; |
|
* case LAYOUTRECALL4_FSID: |
|
* fsid4 lor_fsid; |
|
* case LAYOUTRECALL4_ALL: |
|
* void; |
|
* }; |
|
* |
|
* struct CB_LAYOUTRECALL4args { |
|
* layouttype4 clora_type; |
|
* layoutiomode4 clora_iomode; |
|
* bool clora_changed; |
|
* layoutrecall4 clora_recall; |
|
* }; |
|
*/ |
|
static void encode_cb_layout4args(struct xdr_stream *xdr, |
|
const struct nfs4_layout_stateid *ls, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
__be32 *p; |
|
|
|
BUG_ON(hdr->minorversion == 0); |
|
|
|
p = xdr_reserve_space(xdr, 5 * 4); |
|
*p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); |
|
*p++ = cpu_to_be32(ls->ls_layout_type); |
|
*p++ = cpu_to_be32(IOMODE_ANY); |
|
*p++ = cpu_to_be32(1); |
|
*p = cpu_to_be32(RETURN_FILE); |
|
|
|
encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); |
|
|
|
p = xdr_reserve_space(xdr, 2 * 8); |
|
p = xdr_encode_hyper(p, 0); |
|
xdr_encode_hyper(p, NFS4_MAX_UINT64); |
|
|
|
encode_stateid4(xdr, &ls->ls_recall_sid); |
|
|
|
hdr->nops++; |
|
} |
|
|
|
static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, |
|
struct xdr_stream *xdr, |
|
const void *data) |
|
{ |
|
const struct nfsd4_callback *cb = data; |
|
const struct nfs4_layout_stateid *ls = |
|
container_of(cb, struct nfs4_layout_stateid, ls_recall); |
|
struct nfs4_cb_compound_hdr hdr = { |
|
.ident = 0, |
|
.minorversion = cb->cb_clp->cl_minorversion, |
|
}; |
|
|
|
encode_cb_compound4args(xdr, &hdr); |
|
encode_cb_sequence4args(xdr, cb, &hdr); |
|
encode_cb_layout4args(xdr, ls, &hdr); |
|
encode_cb_nops(&hdr); |
|
} |
|
|
|
static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, |
|
struct xdr_stream *xdr, |
|
void *data) |
|
{ |
|
struct nfsd4_callback *cb = data; |
|
struct nfs4_cb_compound_hdr hdr; |
|
int status; |
|
|
|
status = decode_cb_compound4res(xdr, &hdr); |
|
if (unlikely(status)) |
|
return status; |
|
|
|
status = decode_cb_sequence4res(xdr, cb); |
|
if (unlikely(status || cb->cb_seq_status)) |
|
return status; |
|
|
|
return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status); |
|
} |
|
#endif /* CONFIG_NFSD_PNFS */ |
|
|
|
static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len); |
|
p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8); |
|
xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); |
|
} |
|
|
|
static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, |
|
struct xdr_stream *xdr, |
|
const void *data) |
|
{ |
|
const struct nfsd4_callback *cb = data; |
|
const struct nfsd4_blocked_lock *nbl = |
|
container_of(cb, struct nfsd4_blocked_lock, nbl_cb); |
|
struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.fl_owner; |
|
struct nfs4_cb_compound_hdr hdr = { |
|
.ident = 0, |
|
.minorversion = cb->cb_clp->cl_minorversion, |
|
}; |
|
|
|
__be32 *p; |
|
|
|
BUG_ON(hdr.minorversion == 0); |
|
|
|
encode_cb_compound4args(xdr, &hdr); |
|
encode_cb_sequence4args(xdr, cb, &hdr); |
|
|
|
p = xdr_reserve_space(xdr, 4); |
|
*p = cpu_to_be32(OP_CB_NOTIFY_LOCK); |
|
encode_nfs_fh4(xdr, &nbl->nbl_fh); |
|
encode_stateowner(xdr, &lo->lo_owner); |
|
hdr.nops++; |
|
|
|
encode_cb_nops(&hdr); |
|
} |
|
|
|
static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp, |
|
struct xdr_stream *xdr, |
|
void *data) |
|
{ |
|
struct nfsd4_callback *cb = data; |
|
struct nfs4_cb_compound_hdr hdr; |
|
int status; |
|
|
|
status = decode_cb_compound4res(xdr, &hdr); |
|
if (unlikely(status)) |
|
return status; |
|
|
|
status = decode_cb_sequence4res(xdr, cb); |
|
if (unlikely(status || cb->cb_seq_status)) |
|
return status; |
|
|
|
return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status); |
|
} |
|
|
|
/* |
|
* struct write_response4 { |
|
* stateid4 wr_callback_id<1>; |
|
* length4 wr_count; |
|
* stable_how4 wr_committed; |
|
* verifier4 wr_writeverf; |
|
* }; |
|
* union offload_info4 switch (nfsstat4 coa_status) { |
|
* case NFS4_OK: |
|
* write_response4 coa_resok4; |
|
* default: |
|
* length4 coa_bytes_copied; |
|
* }; |
|
* struct CB_OFFLOAD4args { |
|
* nfs_fh4 coa_fh; |
|
* stateid4 coa_stateid; |
|
* offload_info4 coa_offload_info; |
|
* }; |
|
*/ |
|
static void encode_offload_info4(struct xdr_stream *xdr, |
|
__be32 nfserr, |
|
const struct nfsd4_copy *cp) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, 4); |
|
*p++ = nfserr; |
|
if (!nfserr) { |
|
p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); |
|
p = xdr_encode_empty_array(p); |
|
p = xdr_encode_hyper(p, cp->cp_res.wr_bytes_written); |
|
*p++ = cpu_to_be32(cp->cp_res.wr_stable_how); |
|
p = xdr_encode_opaque_fixed(p, cp->cp_res.wr_verifier.data, |
|
NFS4_VERIFIER_SIZE); |
|
} else { |
|
p = xdr_reserve_space(xdr, 8); |
|
/* We always return success if bytes were written */ |
|
p = xdr_encode_hyper(p, 0); |
|
} |
|
} |
|
|
|
static void encode_cb_offload4args(struct xdr_stream *xdr, |
|
__be32 nfserr, |
|
const struct knfsd_fh *fh, |
|
const struct nfsd4_copy *cp, |
|
struct nfs4_cb_compound_hdr *hdr) |
|
{ |
|
__be32 *p; |
|
|
|
p = xdr_reserve_space(xdr, 4); |
|
*p++ = cpu_to_be32(OP_CB_OFFLOAD); |
|
encode_nfs_fh4(xdr, fh); |
|
encode_stateid4(xdr, &cp->cp_res.cb_stateid); |
|
encode_offload_info4(xdr, nfserr, cp); |
|
|
|
hdr->nops++; |
|
} |
|
|
|
static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req, |
|
struct xdr_stream *xdr, |
|
const void *data) |
|
{ |
|
const struct nfsd4_callback *cb = data; |
|
const struct nfsd4_copy *cp = |
|
container_of(cb, struct nfsd4_copy, cp_cb); |
|
struct nfs4_cb_compound_hdr hdr = { |
|
.ident = 0, |
|
.minorversion = cb->cb_clp->cl_minorversion, |
|
}; |
|
|
|
encode_cb_compound4args(xdr, &hdr); |
|
encode_cb_sequence4args(xdr, cb, &hdr); |
|
encode_cb_offload4args(xdr, cp->nfserr, &cp->fh, cp, &hdr); |
|
encode_cb_nops(&hdr); |
|
} |
|
|
|
static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp, |
|
struct xdr_stream *xdr, |
|
void *data) |
|
{ |
|
struct nfsd4_callback *cb = data; |
|
struct nfs4_cb_compound_hdr hdr; |
|
int status; |
|
|
|
status = decode_cb_compound4res(xdr, &hdr); |
|
if (unlikely(status)) |
|
return status; |
|
|
|
status = decode_cb_sequence4res(xdr, cb); |
|
if (unlikely(status || cb->cb_seq_status)) |
|
return status; |
|
|
|
return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status); |
|
} |
|
/* |
|
* RPC procedure tables |
|
*/ |
|
#define PROC(proc, call, argtype, restype) \ |
|
[NFSPROC4_CLNT_##proc] = { \ |
|
.p_proc = NFSPROC4_CB_##call, \ |
|
.p_encode = nfs4_xdr_enc_##argtype, \ |
|
.p_decode = 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 const struct rpc_procinfo nfs4_cb_procedures[] = { |
|
PROC(CB_NULL, NULL, cb_null, cb_null), |
|
PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), |
|
#ifdef CONFIG_NFSD_PNFS |
|
PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), |
|
#endif |
|
PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), |
|
PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), |
|
}; |
|
|
|
static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)]; |
|
static const 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, |
|
.counts = nfs4_cb_counts, |
|
}; |
|
|
|
static const struct rpc_version *nfs_cb_version[2] = { |
|
[1] = &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(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
/* |
|
* nfsd4_lease is set to at most one hour in __nfsd4_write_time, |
|
* so we can use 32-bit math on it. Warn if that assumption |
|
* ever stops being true. |
|
*/ |
|
if (WARN_ON_ONCE(nn->nfsd4_lease > 3600)) |
|
return 360 * HZ; |
|
|
|
return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ; |
|
} |
|
|
|
static struct workqueue_struct *callback_wq; |
|
|
|
static bool nfsd4_queue_cb(struct nfsd4_callback *cb) |
|
{ |
|
return queue_work(callback_wq, &cb->cb_work); |
|
} |
|
|
|
static void nfsd41_cb_inflight_begin(struct nfs4_client *clp) |
|
{ |
|
atomic_inc(&clp->cl_cb_inflight); |
|
} |
|
|
|
static void nfsd41_cb_inflight_end(struct nfs4_client *clp) |
|
{ |
|
|
|
if (atomic_dec_and_test(&clp->cl_cb_inflight)) |
|
wake_up_var(&clp->cl_cb_inflight); |
|
} |
|
|
|
static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp) |
|
{ |
|
wait_var_event(&clp->cl_cb_inflight, |
|
!atomic_read(&clp->cl_cb_inflight)); |
|
} |
|
|
|
static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
|
{ |
|
if (clp->cl_minorversion == 0) { |
|
client->cl_principal = clp->cl_cred.cr_targ_princ ? |
|
clp->cl_cred.cr_targ_princ : "nfs"; |
|
|
|
return get_cred(rpc_machine_cred()); |
|
} else { |
|
struct cred *kcred; |
|
|
|
kcred = prepare_kernel_cred(NULL); |
|
if (!kcred) |
|
return NULL; |
|
|
|
kcred->uid = ses->se_cb_sec.uid; |
|
kcred->gid = ses->se_cb_sec.gid; |
|
return kcred; |
|
} |
|
} |
|
|
|
static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
|
{ |
|
int maxtime = max_cb_time(clp->net); |
|
struct rpc_timeout timeparms = { |
|
.to_initval = maxtime, |
|
.to_retries = 0, |
|
.to_maxval = maxtime, |
|
}; |
|
struct rpc_create_args args = { |
|
.net = clp->net, |
|
.address = (struct sockaddr *) &conn->cb_addr, |
|
.addrsize = conn->cb_addrlen, |
|
.saddress = (struct sockaddr *) &conn->cb_saddr, |
|
.timeout = &timeparms, |
|
.program = &cb_program, |
|
.version = 1, |
|
.flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
|
.cred = current_cred(), |
|
}; |
|
struct rpc_clnt *client; |
|
const struct cred *cred; |
|
|
|
if (clp->cl_minorversion == 0) { |
|
if (!clp->cl_cred.cr_principal && |
|
(clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) { |
|
trace_nfsd_cb_setup_err(clp, -EINVAL); |
|
return -EINVAL; |
|
} |
|
args.client_name = clp->cl_cred.cr_principal; |
|
args.prognumber = conn->cb_prog; |
|
args.protocol = XPRT_TRANSPORT_TCP; |
|
args.authflavor = clp->cl_cred.cr_flavor; |
|
clp->cl_cb_ident = conn->cb_ident; |
|
} else { |
|
if (!conn->cb_xprt) { |
|
trace_nfsd_cb_setup_err(clp, -EINVAL); |
|
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 = conn->cb_xprt->xpt_class->xcl_ident | |
|
XPRT_TRANSPORT_BC; |
|
args.authflavor = ses->se_cb_sec.flavor; |
|
} |
|
/* Create RPC client */ |
|
client = rpc_create(&args); |
|
if (IS_ERR(client)) { |
|
trace_nfsd_cb_setup_err(clp, PTR_ERR(client)); |
|
return PTR_ERR(client); |
|
} |
|
cred = get_backchannel_cred(clp, client, ses); |
|
if (!cred) { |
|
trace_nfsd_cb_setup_err(clp, -ENOMEM); |
|
rpc_shutdown_client(client); |
|
return -ENOMEM; |
|
} |
|
clp->cl_cb_client = client; |
|
clp->cl_cb_cred = cred; |
|
trace_nfsd_cb_setup(clp); |
|
return 0; |
|
} |
|
|
|
static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) |
|
{ |
|
if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
|
return; |
|
clp->cl_cb_state = NFSD4_CB_DOWN; |
|
trace_nfsd_cb_state(clp); |
|
} |
|
|
|
static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) |
|
{ |
|
if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
|
return; |
|
clp->cl_cb_state = NFSD4_CB_FAULT; |
|
trace_nfsd_cb_state(clp); |
|
} |
|
|
|
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); |
|
|
|
trace_nfsd_cb_done(clp, task->tk_status); |
|
if (task->tk_status) |
|
nfsd4_mark_cb_down(clp, task->tk_status); |
|
else { |
|
clp->cl_cb_state = NFSD4_CB_UP; |
|
trace_nfsd_cb_state(clp); |
|
} |
|
} |
|
|
|
static void nfsd4_cb_probe_release(void *calldata) |
|
{ |
|
struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
|
|
|
nfsd41_cb_inflight_end(clp); |
|
|
|
} |
|
|
|
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, |
|
.rpc_release = nfsd4_cb_probe_release, |
|
}; |
|
|
|
/* |
|
* 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; |
|
trace_nfsd_cb_state(clp); |
|
set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
|
nfsd4_run_cb(&clp->cl_cb_null); |
|
} |
|
|
|
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); |
|
trace_nfsd_cb_state(clp); |
|
} |
|
|
|
/* |
|
* 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 nfsd4_callback *cb, struct rpc_task *task) |
|
{ |
|
struct nfs4_client *clp = cb->cb_clp; |
|
|
|
if (!cb->cb_holds_slot && |
|
test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
|
rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); |
|
/* Race breaker */ |
|
if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { |
|
dprintk("%s slot is busy\n", __func__); |
|
return false; |
|
} |
|
rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); |
|
} |
|
cb->cb_holds_slot = true; |
|
return true; |
|
} |
|
|
|
static void nfsd41_cb_release_slot(struct nfsd4_callback *cb) |
|
{ |
|
struct nfs4_client *clp = cb->cb_clp; |
|
|
|
if (cb->cb_holds_slot) { |
|
cb->cb_holds_slot = false; |
|
clear_bit(0, &clp->cl_cb_slot_busy); |
|
rpc_wake_up_next(&clp->cl_cb_waitq); |
|
} |
|
} |
|
|
|
static void nfsd41_destroy_cb(struct nfsd4_callback *cb) |
|
{ |
|
struct nfs4_client *clp = cb->cb_clp; |
|
|
|
nfsd41_cb_release_slot(cb); |
|
if (cb->cb_ops && cb->cb_ops->release) |
|
cb->cb_ops->release(cb); |
|
nfsd41_cb_inflight_end(clp); |
|
} |
|
|
|
/* |
|
* 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_client *clp = cb->cb_clp; |
|
u32 minorversion = clp->cl_minorversion; |
|
|
|
/* |
|
* cb_seq_status is only set in decode_cb_sequence4res, |
|
* and so will remain 1 if an rpc level failure occurs. |
|
*/ |
|
cb->cb_seq_status = 1; |
|
cb->cb_status = 0; |
|
if (minorversion && !nfsd41_cb_get_slot(cb, task)) |
|
return; |
|
rpc_call_start(task); |
|
} |
|
|
|
static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb) |
|
{ |
|
struct nfs4_client *clp = cb->cb_clp; |
|
struct nfsd4_session *session = clp->cl_cb_session; |
|
bool ret = true; |
|
|
|
if (!clp->cl_minorversion) { |
|
/* |
|
* If the backchannel connection was shut down while this |
|
* task was queued, we need to resubmit it after setting up |
|
* a new backchannel connection. |
|
* |
|
* Note that if we lost our callback connection permanently |
|
* the submission code will error out, so we don't need to |
|
* handle that case here. |
|
*/ |
|
if (RPC_SIGNALLED(task)) |
|
goto need_restart; |
|
|
|
return true; |
|
} |
|
|
|
if (!cb->cb_holds_slot) |
|
goto need_restart; |
|
|
|
switch (cb->cb_seq_status) { |
|
case 0: |
|
/* |
|
* No need for lock, access serialized in nfsd4_cb_prepare |
|
* |
|
* RFC5661 20.9.3 |
|
* If CB_SEQUENCE returns an error, then the state of the slot |
|
* (sequence ID, cached reply) MUST NOT change. |
|
*/ |
|
++session->se_cb_seq_nr; |
|
break; |
|
case -ESERVERFAULT: |
|
++session->se_cb_seq_nr; |
|
fallthrough; |
|
case 1: |
|
case -NFS4ERR_BADSESSION: |
|
nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status); |
|
ret = false; |
|
break; |
|
case -NFS4ERR_DELAY: |
|
if (!rpc_restart_call(task)) |
|
goto out; |
|
|
|
rpc_delay(task, 2 * HZ); |
|
return false; |
|
case -NFS4ERR_BADSLOT: |
|
goto retry_nowait; |
|
case -NFS4ERR_SEQ_MISORDERED: |
|
if (session->se_cb_seq_nr != 1) { |
|
session->se_cb_seq_nr = 1; |
|
goto retry_nowait; |
|
} |
|
break; |
|
default: |
|
nfsd4_mark_cb_fault(cb->cb_clp, cb->cb_seq_status); |
|
dprintk("%s: unprocessed error %d\n", __func__, |
|
cb->cb_seq_status); |
|
} |
|
|
|
nfsd41_cb_release_slot(cb); |
|
dprintk("%s: freed slot, new seqid=%d\n", __func__, |
|
clp->cl_cb_session->se_cb_seq_nr); |
|
|
|
if (RPC_SIGNALLED(task)) |
|
goto need_restart; |
|
out: |
|
return ret; |
|
retry_nowait: |
|
if (rpc_restart_call_prepare(task)) |
|
ret = false; |
|
goto out; |
|
need_restart: |
|
if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) { |
|
task->tk_status = 0; |
|
cb->cb_need_restart = true; |
|
} |
|
return false; |
|
} |
|
|
|
static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
|
{ |
|
struct nfsd4_callback *cb = calldata; |
|
struct nfs4_client *clp = cb->cb_clp; |
|
|
|
trace_nfsd_cb_done(clp, task->tk_status); |
|
|
|
if (!nfsd4_cb_sequence_done(task, cb)) |
|
return; |
|
|
|
if (cb->cb_status) { |
|
WARN_ON_ONCE(task->tk_status); |
|
task->tk_status = cb->cb_status; |
|
} |
|
|
|
switch (cb->cb_ops->done(cb, task)) { |
|
case 0: |
|
task->tk_status = 0; |
|
rpc_restart_call_prepare(task); |
|
return; |
|
case 1: |
|
switch (task->tk_status) { |
|
case -EIO: |
|
case -ETIMEDOUT: |
|
case -EACCES: |
|
nfsd4_mark_cb_down(clp, task->tk_status); |
|
} |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
static void nfsd4_cb_release(void *calldata) |
|
{ |
|
struct nfsd4_callback *cb = calldata; |
|
|
|
if (cb->cb_need_restart) |
|
nfsd4_queue_cb(cb); |
|
else |
|
nfsd41_destroy_cb(cb); |
|
|
|
} |
|
|
|
static const struct rpc_call_ops nfsd4_cb_ops = { |
|
.rpc_call_prepare = nfsd4_cb_prepare, |
|
.rpc_call_done = nfsd4_cb_done, |
|
.rpc_release = nfsd4_cb_release, |
|
}; |
|
|
|
int nfsd4_create_callback_queue(void) |
|
{ |
|
callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0); |
|
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_run_cb_null() will detect the killed |
|
* client, destroy the rpc client, and stop: |
|
*/ |
|
nfsd4_run_cb(&clp->cl_cb_null); |
|
flush_workqueue(callback_wq); |
|
nfsd41_cb_inflight_wait_complete(clp); |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
/* |
|
* Note there isn't a lot of locking in this code; instead we depend on |
|
* the fact that it is run from the callback_wq, which won't run two |
|
* work items at once. So, for example, callback_wq handles all access |
|
* of cl_cb_client and all calls to rpc_create or rpc_shutdown_client. |
|
*/ |
|
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) { |
|
trace_nfsd_cb_shutdown(clp); |
|
rpc_shutdown_client(clp->cl_cb_client); |
|
clp->cl_cb_client = NULL; |
|
put_cred(clp->cl_cb_cred); |
|
clp->cl_cb_cred = 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); |
|
if (c) |
|
svc_xprt_put(c->cn_xprt); |
|
return; |
|
} |
|
} |
|
|
|
static void |
|
nfsd4_run_cb_work(struct work_struct *work) |
|
{ |
|
struct nfsd4_callback *cb = |
|
container_of(work, struct nfsd4_callback, cb_work); |
|
struct nfs4_client *clp = cb->cb_clp; |
|
struct rpc_clnt *clnt; |
|
int flags; |
|
|
|
trace_nfsd_cb_work(clp, cb->cb_msg.rpc_proc->p_name); |
|
|
|
if (cb->cb_need_restart) { |
|
cb->cb_need_restart = false; |
|
} else { |
|
if (cb->cb_ops && cb->cb_ops->prepare) |
|
cb->cb_ops->prepare(cb); |
|
} |
|
|
|
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: */ |
|
nfsd41_destroy_cb(cb); |
|
return; |
|
} |
|
|
|
/* |
|
* Don't send probe messages for 4.1 or later. |
|
*/ |
|
if (!cb->cb_ops && clp->cl_minorversion) { |
|
clp->cl_cb_state = NFSD4_CB_UP; |
|
nfsd41_destroy_cb(cb); |
|
return; |
|
} |
|
|
|
cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
|
flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN; |
|
rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags, |
|
cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); |
|
} |
|
|
|
void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, |
|
const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) |
|
{ |
|
cb->cb_clp = clp; |
|
cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; |
|
cb->cb_msg.rpc_argp = cb; |
|
cb->cb_msg.rpc_resp = cb; |
|
cb->cb_ops = ops; |
|
INIT_WORK(&cb->cb_work, nfsd4_run_cb_work); |
|
cb->cb_seq_status = 1; |
|
cb->cb_status = 0; |
|
cb->cb_need_restart = false; |
|
cb->cb_holds_slot = false; |
|
} |
|
|
|
void nfsd4_run_cb(struct nfsd4_callback *cb) |
|
{ |
|
struct nfs4_client *clp = cb->cb_clp; |
|
|
|
nfsd41_cb_inflight_begin(clp); |
|
if (!nfsd4_queue_cb(cb)) |
|
nfsd41_cb_inflight_end(clp); |
|
}
|
|
|