1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 #include "librbd/object_map/SnapshotCreateRequest.h"
5 #include "common/dout.h"
6 #include "librbd/ImageCtx.h"
7 #include "librbd/ObjectMap.h"
8 #include "cls/lock/cls_lock_client.h"
11 #define dout_subsys ceph_subsys_rbd
13 #define dout_prefix *_dout << "librbd::object_map::SnapshotCreateRequest: "
16 namespace object_map
{
20 std::ostream
& operator<<(std::ostream
& os
,
21 const SnapshotCreateRequest::State
& state
) {
23 case SnapshotCreateRequest::STATE_READ_MAP
:
26 case SnapshotCreateRequest::STATE_WRITE_MAP
:
29 case SnapshotCreateRequest::STATE_ADD_SNAPSHOT
:
33 os
<< "UNKNOWN (" << static_cast<uint32_t>(state
) << ")";
39 } // anonymous namespace
41 void SnapshotCreateRequest::send() {
45 bool SnapshotCreateRequest::should_complete(int r
) {
46 CephContext
*cct
= m_image_ctx
.cct
;
47 ldout(cct
, 5) << this << " " << __func__
<< ": state=" << m_state
<< ", "
48 << "r=" << r
<< dendl
;
49 if (r
< 0 && m_ret_val
== 0) {
53 // pass errors down to base class to invalidate the object map
54 return Request::should_complete(r
);
57 std::shared_lock owner_locker
{m_image_ctx
.owner_lock
};
58 bool finished
= false;
64 finished
= send_add_snapshot();
66 case STATE_ADD_SNAPSHOT
:
77 void SnapshotCreateRequest::send_read_map() {
78 ceph_assert(ceph_mutex_is_locked(m_image_ctx
.image_lock
));
80 CephContext
*cct
= m_image_ctx
.cct
;
81 std::string
oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, CEPH_NOSNAP
));
82 ldout(cct
, 5) << this << " " << __func__
<< ": oid=" << oid
<< dendl
;
83 m_state
= STATE_READ_MAP
;
85 // IO is blocked due to the snapshot creation -- consistent to read from disk
86 librados::ObjectReadOperation op
;
87 op
.read(0, 0, NULL
, NULL
);
89 librados::AioCompletion
*rados_completion
= create_callback_completion();
90 int r
= m_image_ctx
.md_ctx
.aio_operate(oid
, rados_completion
, &op
,
93 rados_completion
->release();
96 void SnapshotCreateRequest::send_write_map() {
97 CephContext
*cct
= m_image_ctx
.cct
;
98 std::string
snap_oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, m_snap_id
));
99 ldout(cct
, 5) << this << " " << __func__
<< ": snap_oid=" << snap_oid
101 m_state
= STATE_WRITE_MAP
;
103 librados::ObjectWriteOperation op
;
104 op
.write_full(m_read_bl
);
106 librados::AioCompletion
*rados_completion
= create_callback_completion();
107 int r
= m_image_ctx
.md_ctx
.aio_operate(snap_oid
, rados_completion
, &op
);
109 rados_completion
->release();
112 bool SnapshotCreateRequest::send_add_snapshot() {
113 std::shared_lock image_locker
{m_image_ctx
.image_lock
};
114 if ((m_image_ctx
.features
& RBD_FEATURE_FAST_DIFF
) == 0) {
118 CephContext
*cct
= m_image_ctx
.cct
;
119 std::string
oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, CEPH_NOSNAP
));
120 ldout(cct
, 5) << this << " " << __func__
<< ": oid=" << oid
<< dendl
;
121 m_state
= STATE_ADD_SNAPSHOT
;
123 librados::ObjectWriteOperation op
;
124 rados::cls::lock::assert_locked(&op
, RBD_LOCK_NAME
, ClsLockType::EXCLUSIVE
, "", "");
125 cls_client::object_map_snap_add(&op
);
127 librados::AioCompletion
*rados_completion
= create_callback_completion();
128 int r
= m_image_ctx
.md_ctx
.aio_operate(oid
, rados_completion
, &op
);
130 rados_completion
->release();
134 void SnapshotCreateRequest::update_object_map() {
135 std::unique_lock object_map_locker
{*m_object_map_lock
};
137 auto it
= m_object_map
.begin();
138 auto end_it
= m_object_map
.end();
139 for (; it
!= end_it
; ++it
) {
140 if (*it
== OBJECT_EXISTS
) {
141 *it
= OBJECT_EXISTS_CLEAN
;
146 } // namespace object_map
147 } // namespace librbd