71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: MIT
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// The extended attribute operations of RFC 8276: four narrow operations
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// over named opaque values.
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package nfs4
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import (
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"sourcedock.dev/petrbalvin/nfs/internal/xdr"
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)
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// SETXATTR modes of the setxattr4mode4 enum.
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const (
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SetXattrUnchecked = 0
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SetXattrCreate = 1
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SetXattrReplace = 2
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)
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// AppendGetXattrArgs appends the GETXATTR argop: the name alone, the
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// whole argument RFC 8276 defines.
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func AppendGetXattrArgs(b []byte, name string) []byte {
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b = xdr.AppendUint32(b, OpGetxattr)
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return xdr.AppendString(b, name)
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}
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// AppendGetXattrRes appends a successful GETXATTR result: the value as
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// one opaque.
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func AppendGetXattrRes(b []byte, value []byte) []byte {
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return xdr.AppendVarOpaque(b, value)
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}
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// DecodeGetXattrRes decodes a successful GETXATTR result.
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func DecodeGetXattrRes(body []byte) ([]byte, error) {
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return xdr.NewDecoder(body).VarOpaque()
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}
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// AppendSetXattrArgs appends the SETXATTR argop: the create mode, the
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// name and the value.
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func AppendSetXattrArgs(b []byte, mode uint32, name string, value []byte) []byte {
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b = xdr.AppendUint32(b, OpSetxattr)
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b = xdr.AppendUint32(b, mode)
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b = xdr.AppendString(b, name)
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return xdr.AppendVarOpaque(b, value)
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}
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// AppendListXattrArgs appends the LISTXATTR argop: the cookie the last
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// reply returned and the response size budget.
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func AppendListXattrArgs(b []byte, cookie uint64, maxcount uint32) []byte {
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b = xdr.AppendUint32(b, OpListxattr)
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b = xdr.AppendUint64(b, cookie)
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return xdr.AppendUint32(b, maxcount)
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}
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// AppendListXattrRes appends a successful LISTXATTR result: the cookie
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// of the last name, the names and the end of list flag.
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func AppendListXattrRes(b []byte, cookie uint64, names []string, eof bool) []byte {
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b = xdr.AppendUint64(b, cookie)
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b = xdr.AppendUint32(b, uint32(len(names)))
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for _, n := range names {
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b = xdr.AppendString(b, n)
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}
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return xdr.AppendBool(b, eof)
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}
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// AppendRemoveXattrArgs appends the REMOVEXATTR argop: the name.
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func AppendRemoveXattrArgs(b []byte, name string) []byte {
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b = xdr.AppendUint32(b, OpRemovexattr)
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return xdr.AppendString(b, name)
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}
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