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git.proxmox.com Git - ceph.git/blob - ceph/src/librbd/object_map/SnapshotCreateRequest.cc
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 RWLock::RLocker
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 assert(m_image_ctx
.snap_lock
.is_locked());
79 assert(m_image_ctx
.get_snap_info(m_snap_id
) != NULL
);
81 CephContext
*cct
= m_image_ctx
.cct
;
82 std::string
oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, CEPH_NOSNAP
));
83 ldout(cct
, 5) << this << " " << __func__
<< ": oid=" << oid
<< dendl
;
84 m_state
= STATE_READ_MAP
;
86 // IO is blocked due to the snapshot creation -- consistent to read from disk
87 librados::ObjectReadOperation op
;
88 op
.read(0, 0, NULL
, NULL
);
90 librados::AioCompletion
*rados_completion
= create_callback_completion();
91 int r
= m_image_ctx
.md_ctx
.aio_operate(oid
, rados_completion
, &op
,
94 rados_completion
->release();
97 void SnapshotCreateRequest::send_write_map() {
98 CephContext
*cct
= m_image_ctx
.cct
;
99 std::string
snap_oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, m_snap_id
));
100 ldout(cct
, 5) << this << " " << __func__
<< ": snap_oid=" << snap_oid
102 m_state
= STATE_WRITE_MAP
;
104 librados::ObjectWriteOperation op
;
105 op
.write_full(m_read_bl
);
107 librados::AioCompletion
*rados_completion
= create_callback_completion();
108 int r
= m_image_ctx
.md_ctx
.aio_operate(snap_oid
, rados_completion
, &op
);
110 rados_completion
->release();
113 bool SnapshotCreateRequest::send_add_snapshot() {
114 RWLock::RLocker
snap_locker(m_image_ctx
.snap_lock
);
115 if ((m_image_ctx
.features
& RBD_FEATURE_FAST_DIFF
) == 0) {
119 CephContext
*cct
= m_image_ctx
.cct
;
120 std::string
oid(ObjectMap
<>::object_map_name(m_image_ctx
.id
, CEPH_NOSNAP
));
121 ldout(cct
, 5) << this << " " << __func__
<< ": oid=" << oid
<< dendl
;
122 m_state
= STATE_ADD_SNAPSHOT
;
124 librados::ObjectWriteOperation op
;
125 rados::cls::lock::assert_locked(&op
, RBD_LOCK_NAME
, LOCK_EXCLUSIVE
, "", "");
126 cls_client::object_map_snap_add(&op
);
128 librados::AioCompletion
*rados_completion
= create_callback_completion();
129 int r
= m_image_ctx
.md_ctx
.aio_operate(oid
, rados_completion
, &op
);
131 rados_completion
->release();
135 void SnapshotCreateRequest::update_object_map() {
136 RWLock::WLocker
snap_locker(m_image_ctx
.snap_lock
);
137 RWLock::WLocker
object_map_locker(m_image_ctx
.object_map_lock
);
139 auto it
= m_object_map
.begin();
140 auto end_it
= m_object_map
.end();
141 for (; it
!= end_it
; ++it
) {
142 if (*it
== OBJECT_EXISTS
) {
143 *it
= OBJECT_EXISTS_CLEAN
;
148 } // namespace object_map
149 } // namespace librbd