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588 lines
13 KiB
588 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/lockd/clnt4xdr.c |
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* |
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* XDR functions to encode/decode NLM version 4 RPC arguments and results. |
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* |
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* NLM client-side only. |
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* |
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* Copyright (C) 2010, Oracle. All rights reserved. |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/sunrpc/xdr.h> |
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#include <linux/sunrpc/clnt.h> |
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#include <linux/sunrpc/stats.h> |
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#include <linux/lockd/lockd.h> |
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#include <uapi/linux/nfs3.h> |
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#define NLMDBG_FACILITY NLMDBG_XDR |
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#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ) |
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# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!" |
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#endif |
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#if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN) |
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# error "NLM host name cannot be larger than NLM's maximum string length!" |
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#endif |
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/* |
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* Declare the space requirements for NLM arguments and replies as |
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* number of 32bit-words |
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*/ |
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#define NLM4_void_sz (0) |
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#define NLM4_cookie_sz (1+(NLM_MAXCOOKIELEN>>2)) |
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#define NLM4_caller_sz (1+(NLMCLNT_OHSIZE>>2)) |
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#define NLM4_owner_sz (1+(NLMCLNT_OHSIZE>>2)) |
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#define NLM4_fhandle_sz (1+(NFS3_FHSIZE>>2)) |
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#define NLM4_lock_sz (5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz) |
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#define NLM4_holder_sz (6+NLM4_owner_sz) |
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#define NLM4_testargs_sz (NLM4_cookie_sz+1+NLM4_lock_sz) |
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#define NLM4_lockargs_sz (NLM4_cookie_sz+4+NLM4_lock_sz) |
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#define NLM4_cancargs_sz (NLM4_cookie_sz+2+NLM4_lock_sz) |
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#define NLM4_unlockargs_sz (NLM4_cookie_sz+NLM4_lock_sz) |
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#define NLM4_testres_sz (NLM4_cookie_sz+1+NLM4_holder_sz) |
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#define NLM4_res_sz (NLM4_cookie_sz+1) |
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#define NLM4_norep_sz (0) |
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static s64 loff_t_to_s64(loff_t offset) |
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{ |
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s64 res; |
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if (offset >= NLM4_OFFSET_MAX) |
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res = NLM4_OFFSET_MAX; |
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else if (offset <= -NLM4_OFFSET_MAX) |
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res = -NLM4_OFFSET_MAX; |
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else |
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res = offset; |
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return res; |
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} |
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static void nlm4_compute_offsets(const struct nlm_lock *lock, |
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u64 *l_offset, u64 *l_len) |
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{ |
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const struct file_lock *fl = &lock->fl; |
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*l_offset = loff_t_to_s64(fl->fl_start); |
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if (fl->fl_end == OFFSET_MAX) |
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*l_len = 0; |
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else |
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*l_len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1); |
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} |
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/* |
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* Encode/decode NLMv4 basic data types |
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* |
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* Basic NLMv4 data types are defined in Appendix II, section 6.1.4 |
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* of RFC 1813: "NFS Version 3 Protocol Specification" and in Chapter |
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* 10 of X/Open's "Protocols for Interworking: XNFS, Version 3W". |
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* |
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* Not all basic data types have their own encoding and decoding |
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* functions. For run-time efficiency, some data types are encoded |
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* or decoded inline. |
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*/ |
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static void encode_bool(struct xdr_stream *xdr, const int value) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, 4); |
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*p = value ? xdr_one : xdr_zero; |
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} |
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static void encode_int32(struct xdr_stream *xdr, const s32 value) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, 4); |
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*p = cpu_to_be32(value); |
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} |
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/* |
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* typedef opaque netobj<MAXNETOBJ_SZ> |
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*/ |
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static void encode_netobj(struct xdr_stream *xdr, |
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const u8 *data, const unsigned int length) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, 4 + length); |
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xdr_encode_opaque(p, data, length); |
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} |
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static int decode_netobj(struct xdr_stream *xdr, |
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struct xdr_netobj *obj) |
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{ |
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ssize_t ret; |
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ret = xdr_stream_decode_opaque_inline(xdr, (void *)&obj->data, |
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XDR_MAX_NETOBJ); |
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if (unlikely(ret < 0)) |
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return -EIO; |
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obj->len = ret; |
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return 0; |
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} |
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/* |
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* netobj cookie; |
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*/ |
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static void encode_cookie(struct xdr_stream *xdr, |
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const struct nlm_cookie *cookie) |
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{ |
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encode_netobj(xdr, (u8 *)&cookie->data, cookie->len); |
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} |
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static int decode_cookie(struct xdr_stream *xdr, |
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struct nlm_cookie *cookie) |
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{ |
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u32 length; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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goto out_overflow; |
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length = be32_to_cpup(p++); |
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/* apparently HPUX can return empty cookies */ |
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if (length == 0) |
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goto out_hpux; |
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if (length > NLM_MAXCOOKIELEN) |
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goto out_size; |
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p = xdr_inline_decode(xdr, length); |
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if (unlikely(p == NULL)) |
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goto out_overflow; |
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cookie->len = length; |
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memcpy(cookie->data, p, length); |
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return 0; |
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out_hpux: |
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cookie->len = 4; |
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memset(cookie->data, 0, 4); |
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return 0; |
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out_size: |
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dprintk("NFS: returned cookie was too long: %u\n", length); |
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return -EIO; |
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out_overflow: |
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return -EIO; |
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} |
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/* |
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* netobj fh; |
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*/ |
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static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh) |
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{ |
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encode_netobj(xdr, (u8 *)&fh->data, fh->size); |
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} |
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/* |
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* enum nlm4_stats { |
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* NLM4_GRANTED = 0, |
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* NLM4_DENIED = 1, |
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* NLM4_DENIED_NOLOCKS = 2, |
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* NLM4_BLOCKED = 3, |
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* NLM4_DENIED_GRACE_PERIOD = 4, |
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* NLM4_DEADLCK = 5, |
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* NLM4_ROFS = 6, |
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* NLM4_STALE_FH = 7, |
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* NLM4_FBIG = 8, |
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* NLM4_FAILED = 9 |
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* }; |
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* |
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* struct nlm4_stat { |
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* nlm4_stats stat; |
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* }; |
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* |
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* NB: we don't swap bytes for the NLM status values. The upper |
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* layers deal directly with the status value in network byte |
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* order. |
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*/ |
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static void encode_nlm4_stat(struct xdr_stream *xdr, |
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const __be32 stat) |
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{ |
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__be32 *p; |
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BUG_ON(be32_to_cpu(stat) > NLM_FAILED); |
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p = xdr_reserve_space(xdr, 4); |
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*p = stat; |
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} |
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static int decode_nlm4_stat(struct xdr_stream *xdr, __be32 *stat) |
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{ |
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__be32 *p; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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goto out_overflow; |
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if (unlikely(ntohl(*p) > ntohl(nlm4_failed))) |
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goto out_bad_xdr; |
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*stat = *p; |
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return 0; |
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out_bad_xdr: |
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dprintk("%s: server returned invalid nlm4_stats value: %u\n", |
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__func__, be32_to_cpup(p)); |
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return -EIO; |
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out_overflow: |
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return -EIO; |
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} |
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/* |
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* struct nlm4_holder { |
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* bool exclusive; |
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* int32 svid; |
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* netobj oh; |
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* uint64 l_offset; |
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* uint64 l_len; |
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* }; |
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*/ |
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static void encode_nlm4_holder(struct xdr_stream *xdr, |
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const struct nlm_res *result) |
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{ |
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const struct nlm_lock *lock = &result->lock; |
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u64 l_offset, l_len; |
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__be32 *p; |
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encode_bool(xdr, lock->fl.fl_type == F_RDLCK); |
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encode_int32(xdr, lock->svid); |
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encode_netobj(xdr, lock->oh.data, lock->oh.len); |
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p = xdr_reserve_space(xdr, 4 + 4); |
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nlm4_compute_offsets(lock, &l_offset, &l_len); |
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p = xdr_encode_hyper(p, l_offset); |
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xdr_encode_hyper(p, l_len); |
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} |
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static int decode_nlm4_holder(struct xdr_stream *xdr, struct nlm_res *result) |
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{ |
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struct nlm_lock *lock = &result->lock; |
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struct file_lock *fl = &lock->fl; |
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u64 l_offset, l_len; |
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u32 exclusive; |
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int error; |
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__be32 *p; |
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s32 end; |
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memset(lock, 0, sizeof(*lock)); |
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locks_init_lock(fl); |
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p = xdr_inline_decode(xdr, 4 + 4); |
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if (unlikely(p == NULL)) |
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goto out_overflow; |
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exclusive = be32_to_cpup(p++); |
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lock->svid = be32_to_cpup(p); |
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fl->fl_pid = (pid_t)lock->svid; |
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error = decode_netobj(xdr, &lock->oh); |
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if (unlikely(error)) |
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goto out; |
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p = xdr_inline_decode(xdr, 8 + 8); |
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if (unlikely(p == NULL)) |
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goto out_overflow; |
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fl->fl_flags = FL_POSIX; |
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fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK; |
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p = xdr_decode_hyper(p, &l_offset); |
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xdr_decode_hyper(p, &l_len); |
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end = l_offset + l_len - 1; |
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fl->fl_start = (loff_t)l_offset; |
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if (l_len == 0 || end < 0) |
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fl->fl_end = OFFSET_MAX; |
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else |
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fl->fl_end = (loff_t)end; |
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error = 0; |
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out: |
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return error; |
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out_overflow: |
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return -EIO; |
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} |
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/* |
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* string caller_name<LM_MAXSTRLEN>; |
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*/ |
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static void encode_caller_name(struct xdr_stream *xdr, const char *name) |
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{ |
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/* NB: client-side does not set lock->len */ |
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u32 length = strlen(name); |
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__be32 *p; |
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p = xdr_reserve_space(xdr, 4 + length); |
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xdr_encode_opaque(p, name, length); |
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} |
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/* |
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* struct nlm4_lock { |
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* string caller_name<LM_MAXSTRLEN>; |
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* netobj fh; |
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* netobj oh; |
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* int32 svid; |
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* uint64 l_offset; |
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* uint64 l_len; |
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* }; |
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*/ |
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static void encode_nlm4_lock(struct xdr_stream *xdr, |
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const struct nlm_lock *lock) |
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{ |
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u64 l_offset, l_len; |
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__be32 *p; |
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encode_caller_name(xdr, lock->caller); |
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encode_fh(xdr, &lock->fh); |
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encode_netobj(xdr, lock->oh.data, lock->oh.len); |
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p = xdr_reserve_space(xdr, 4 + 8 + 8); |
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*p++ = cpu_to_be32(lock->svid); |
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nlm4_compute_offsets(lock, &l_offset, &l_len); |
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p = xdr_encode_hyper(p, l_offset); |
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xdr_encode_hyper(p, l_len); |
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} |
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/* |
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* NLMv4 XDR encode functions |
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* |
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* NLMv4 argument types are defined in Appendix II of RFC 1813: |
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* "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's |
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* "Protocols for Interworking: XNFS, Version 3W". |
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*/ |
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/* |
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* struct nlm4_testargs { |
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* netobj cookie; |
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* bool exclusive; |
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* struct nlm4_lock alock; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_testargs(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_args *args = data; |
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const struct nlm_lock *lock = &args->lock; |
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encode_cookie(xdr, &args->cookie); |
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encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
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encode_nlm4_lock(xdr, lock); |
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} |
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/* |
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* struct nlm4_lockargs { |
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* netobj cookie; |
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* bool block; |
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* bool exclusive; |
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* struct nlm4_lock alock; |
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* bool reclaim; |
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* int state; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_lockargs(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_args *args = data; |
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const struct nlm_lock *lock = &args->lock; |
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encode_cookie(xdr, &args->cookie); |
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encode_bool(xdr, args->block); |
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encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
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encode_nlm4_lock(xdr, lock); |
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encode_bool(xdr, args->reclaim); |
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encode_int32(xdr, args->state); |
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} |
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/* |
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* struct nlm4_cancargs { |
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* netobj cookie; |
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* bool block; |
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* bool exclusive; |
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* struct nlm4_lock alock; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_cancargs(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_args *args = data; |
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const struct nlm_lock *lock = &args->lock; |
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encode_cookie(xdr, &args->cookie); |
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encode_bool(xdr, args->block); |
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encode_bool(xdr, lock->fl.fl_type == F_WRLCK); |
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encode_nlm4_lock(xdr, lock); |
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} |
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/* |
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* struct nlm4_unlockargs { |
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* netobj cookie; |
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* struct nlm4_lock alock; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_unlockargs(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_args *args = data; |
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const struct nlm_lock *lock = &args->lock; |
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encode_cookie(xdr, &args->cookie); |
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encode_nlm4_lock(xdr, lock); |
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} |
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/* |
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* struct nlm4_res { |
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* netobj cookie; |
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* nlm4_stat stat; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_res(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_res *result = data; |
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encode_cookie(xdr, &result->cookie); |
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encode_nlm4_stat(xdr, result->status); |
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} |
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/* |
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* union nlm4_testrply switch (nlm4_stats stat) { |
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* case NLM4_DENIED: |
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* struct nlm4_holder holder; |
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* default: |
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* void; |
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* }; |
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* |
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* struct nlm4_testres { |
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* netobj cookie; |
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* nlm4_testrply test_stat; |
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* }; |
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*/ |
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static void nlm4_xdr_enc_testres(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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const void *data) |
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{ |
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const struct nlm_res *result = data; |
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encode_cookie(xdr, &result->cookie); |
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encode_nlm4_stat(xdr, result->status); |
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if (result->status == nlm_lck_denied) |
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encode_nlm4_holder(xdr, result); |
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} |
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|
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/* |
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* NLMv4 XDR decode functions |
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* |
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* NLMv4 argument types are defined in Appendix II of RFC 1813: |
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* "NFS Version 3 Protocol Specification" and Chapter 10 of X/Open's |
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* "Protocols for Interworking: XNFS, Version 3W". |
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*/ |
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/* |
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* union nlm4_testrply switch (nlm4_stats stat) { |
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* case NLM4_DENIED: |
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* struct nlm4_holder holder; |
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* default: |
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* void; |
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* }; |
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* |
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* struct nlm4_testres { |
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* netobj cookie; |
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* nlm4_testrply test_stat; |
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* }; |
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*/ |
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static int decode_nlm4_testrply(struct xdr_stream *xdr, |
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struct nlm_res *result) |
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{ |
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int error; |
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error = decode_nlm4_stat(xdr, &result->status); |
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if (unlikely(error)) |
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goto out; |
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if (result->status == nlm_lck_denied) |
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error = decode_nlm4_holder(xdr, result); |
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out: |
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return error; |
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} |
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static int nlm4_xdr_dec_testres(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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void *data) |
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{ |
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struct nlm_res *result = data; |
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int error; |
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error = decode_cookie(xdr, &result->cookie); |
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if (unlikely(error)) |
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goto out; |
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error = decode_nlm4_testrply(xdr, result); |
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out: |
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return error; |
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} |
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/* |
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* struct nlm4_res { |
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* netobj cookie; |
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* nlm4_stat stat; |
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* }; |
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*/ |
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static int nlm4_xdr_dec_res(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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void *data) |
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{ |
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struct nlm_res *result = data; |
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int error; |
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error = decode_cookie(xdr, &result->cookie); |
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if (unlikely(error)) |
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goto out; |
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error = decode_nlm4_stat(xdr, &result->status); |
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out: |
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return error; |
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} |
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/* |
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* For NLM, a void procedure really returns nothing |
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*/ |
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#define nlm4_xdr_dec_norep NULL |
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#define PROC(proc, argtype, restype) \ |
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[NLMPROC_##proc] = { \ |
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.p_proc = NLMPROC_##proc, \ |
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.p_encode = nlm4_xdr_enc_##argtype, \ |
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.p_decode = nlm4_xdr_dec_##restype, \ |
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.p_arglen = NLM4_##argtype##_sz, \ |
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.p_replen = NLM4_##restype##_sz, \ |
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.p_statidx = NLMPROC_##proc, \ |
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.p_name = #proc, \ |
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} |
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static const struct rpc_procinfo nlm4_procedures[] = { |
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PROC(TEST, testargs, testres), |
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PROC(LOCK, lockargs, res), |
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PROC(CANCEL, cancargs, res), |
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PROC(UNLOCK, unlockargs, res), |
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PROC(GRANTED, testargs, res), |
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PROC(TEST_MSG, testargs, norep), |
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PROC(LOCK_MSG, lockargs, norep), |
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PROC(CANCEL_MSG, cancargs, norep), |
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PROC(UNLOCK_MSG, unlockargs, norep), |
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PROC(GRANTED_MSG, testargs, norep), |
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PROC(TEST_RES, testres, norep), |
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PROC(LOCK_RES, res, norep), |
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PROC(CANCEL_RES, res, norep), |
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PROC(UNLOCK_RES, res, norep), |
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PROC(GRANTED_RES, res, norep), |
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}; |
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static unsigned int nlm_version4_counts[ARRAY_SIZE(nlm4_procedures)]; |
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const struct rpc_version nlm_version4 = { |
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.number = 4, |
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.nrprocs = ARRAY_SIZE(nlm4_procedures), |
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.procs = nlm4_procedures, |
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.counts = nlm_version4_counts, |
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};
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