mirror of https://github.com/ceph/go-ceph
87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
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package cephfs
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/*
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#cgo LDFLAGS: -lcephfs
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#cgo CPPFLAGS: -D_FILE_OFFSET_BITS=64
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#include <stdlib.h>
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#include <cephfs/libcephfs.h>
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*/
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import "C"
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import (
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"unsafe"
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)
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// MdsCommand sends commands to the specified MDS.
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func (mount *MountInfo) MdsCommand(mdsSpec string, args [][]byte) ([]byte, string, error) {
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return mount.mdsCommand(mdsSpec, args, nil)
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}
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// MdsCommandWithInputBuffer sends commands to the specified MDS, with an input
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// buffer.
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func (mount *MountInfo) MdsCommandWithInputBuffer(mdsSpec string, args [][]byte, inputBuffer []byte) ([]byte, string, error) {
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return mount.mdsCommand(mdsSpec, args, inputBuffer)
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}
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// mdsCommand supports sending formatted commands to MDS.
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//
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// Implements:
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// int ceph_mds_command(struct ceph_mount_info *cmount,
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// const char *mds_spec,
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// const char **cmd,
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// size_t cmdlen,
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// const char *inbuf, size_t inbuflen,
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// char **outbuf, size_t *outbuflen,
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// char **outs, size_t *outslen);
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func (mount *MountInfo) mdsCommand(mdsSpec string, args [][]byte, inputBuffer []byte) (buffer []byte, info string, err error) {
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spec := C.CString(mdsSpec)
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defer C.free(unsafe.Pointer(spec))
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argc := len(args)
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argv := make([]*C.char, argc)
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for i, arg := range args {
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argv[i] = C.CString(string(arg))
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}
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// free all array elements in a single defer
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defer func() {
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for i := range argv {
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C.free(unsafe.Pointer(argv[i]))
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}
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}()
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var (
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outs, outbuf *C.char
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outslen, outbuflen C.size_t
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)
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inbuf := C.CString(string(inputBuffer))
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inbufLen := len(inputBuffer)
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defer C.free(unsafe.Pointer(inbuf))
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ret := C.ceph_mds_command(
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mount.mount, // cephfs mount ref
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spec, // mds spec
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&argv[0], // cmd array
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C.size_t(argc), // cmd array length
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inbuf, // bulk input
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C.size_t(inbufLen), // length inbuf
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&outbuf, // buffer
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&outbuflen, // buffer length
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&outs, // status string
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&outslen)
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if outslen > 0 {
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info = C.GoStringN(outs, C.int(outslen))
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C.free(unsafe.Pointer(outs))
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}
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if outbuflen > 0 {
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buffer = C.GoBytes(unsafe.Pointer(outbuf), C.int(outbuflen))
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C.free(unsafe.Pointer(outbuf))
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}
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if ret != 0 {
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return nil, info, getError(ret)
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}
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return buffer, info, nil
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}
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