go-ceph/cephfs/userperm.go

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package cephfs
/*
#cgo LDFLAGS: -lcephfs
#cgo CPPFLAGS: -D_FILE_OFFSET_BITS=64
#include <cephfs/libcephfs.h>
*/
import "C"
import (
"runtime"
"unsafe"
"github.com/ceph/go-ceph/internal/log"
)
// UserPerm types may be used to get or change the credentials used by the
// connection or some operations.
type UserPerm struct {
userPerm *C.UserPerm
// cache create-time params
managed bool // if set, the userPerm was created by go-ceph
uid C.uid_t
gid C.gid_t
gidList []C.gid_t
}
// NewUserPerm creates a UserPerm pointer and the underlying ceph resources.
//
// Implements:
// UserPerm *ceph_userperm_new(uid_t uid, gid_t gid, int ngids, gid_t *gidlist);
func NewUserPerm(uid, gid int, gidlist []int) *UserPerm {
// the C code does not copy the content of the gid list so we keep the
// inputs stashed in the go type. For completeness we stash everything.
p := &UserPerm{
managed: true,
uid: C.uid_t(uid),
gid: C.gid_t(gid),
gidList: make([]C.gid_t, len(gidlist)),
}
var cgids *C.gid_t
if len(p.gidList) > 0 {
for i, gid := range gidlist {
p.gidList[i] = C.gid_t(gid)
}
cgids = (*C.gid_t)(unsafe.Pointer(&p.gidList[0]))
}
p.userPerm = C.ceph_userperm_new(
p.uid, p.gid, C.int(len(p.gidList)), cgids)
// if the go object is unreachable, we would like to free the c-memory
// since this has no other resources than memory associated with it.
// This is only valid for UserPerm objects created by new, and thus have
// the managed var set.
runtime.SetFinalizer(p, destroyUserPerm)
return p
}
// Destroy will explicitly free ceph resources associated with the UserPerm.
//
// Implements:
// void ceph_userperm_destroy(UserPerm *perm);
func (p *UserPerm) Destroy() {
if p.userPerm == nil || !p.managed {
return
}
C.ceph_userperm_destroy(p.userPerm)
p.userPerm = nil
p.gidList = nil
}
func destroyUserPerm(p *UserPerm) {
if p.userPerm != nil && p.managed {
log.Warnf("unreachable UserPerm object has not been destroyed. Cleaning up.")
}
p.Destroy()
}