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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
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" | |
9 | #include <iostream> | |
10 | ||
11 | #define dout_subsys ceph_subsys_rbd | |
12 | #undef dout_prefix | |
13 | #define dout_prefix *_dout << "librbd::object_map::SnapshotCreateRequest: " | |
14 | ||
15 | namespace librbd { | |
16 | namespace object_map { | |
17 | ||
18 | namespace { | |
19 | ||
20 | std::ostream& operator<<(std::ostream& os, | |
21 | const SnapshotCreateRequest::State& state) { | |
22 | switch(state) { | |
23 | case SnapshotCreateRequest::STATE_READ_MAP: | |
24 | os << "READ_MAP"; | |
25 | break; | |
26 | case SnapshotCreateRequest::STATE_WRITE_MAP: | |
27 | os << "WRITE_MAP"; | |
28 | break; | |
29 | case SnapshotCreateRequest::STATE_ADD_SNAPSHOT: | |
30 | os << "ADD_SNAPSHOT"; | |
31 | break; | |
32 | default: | |
33 | os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")"; | |
34 | break; | |
35 | } | |
36 | return os; | |
37 | } | |
38 | ||
39 | } // anonymous namespace | |
40 | ||
41 | void SnapshotCreateRequest::send() { | |
42 | send_read_map(); | |
43 | } | |
44 | ||
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) { | |
50 | m_ret_val = r; | |
51 | } | |
52 | if (m_ret_val < 0) { | |
53 | // pass errors down to base class to invalidate the object map | |
54 | return Request::should_complete(r); | |
55 | } | |
56 | ||
57 | RWLock::RLocker owner_locker(m_image_ctx.owner_lock); | |
58 | bool finished = false; | |
59 | switch (m_state) { | |
60 | case STATE_READ_MAP: | |
61 | send_write_map(); | |
62 | break; | |
63 | case STATE_WRITE_MAP: | |
64 | finished = send_add_snapshot(); | |
65 | break; | |
66 | case STATE_ADD_SNAPSHOT: | |
67 | update_object_map(); | |
68 | finished = true; | |
69 | break; | |
70 | default: | |
71 | assert(false); | |
72 | break; | |
73 | } | |
74 | return finished; | |
75 | } | |
76 | ||
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); | |
80 | ||
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; | |
85 | ||
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); | |
89 | ||
90 | librados::AioCompletion *rados_completion = create_callback_completion(); | |
91 | int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op, | |
92 | &m_read_bl); | |
93 | assert(r == 0); | |
94 | rados_completion->release(); | |
95 | } | |
96 | ||
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 | |
101 | << dendl; | |
102 | m_state = STATE_WRITE_MAP; | |
103 | ||
104 | librados::ObjectWriteOperation op; | |
105 | op.write_full(m_read_bl); | |
106 | ||
107 | librados::AioCompletion *rados_completion = create_callback_completion(); | |
108 | int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op); | |
109 | assert(r == 0); | |
110 | rados_completion->release(); | |
111 | } | |
112 | ||
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) { | |
116 | return true; | |
117 | } | |
118 | ||
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; | |
123 | ||
124 | librados::ObjectWriteOperation op; | |
125 | rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", ""); | |
126 | cls_client::object_map_snap_add(&op); | |
127 | ||
128 | librados::AioCompletion *rados_completion = create_callback_completion(); | |
129 | int r = m_image_ctx.md_ctx.aio_operate(oid, rados_completion, &op); | |
130 | assert(r == 0); | |
131 | rados_completion->release(); | |
132 | return false; | |
133 | } | |
134 | ||
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); | |
b32b8144 FG |
138 | |
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; | |
7c673cae FG |
144 | } |
145 | } | |
146 | } | |
147 | ||
148 | } // namespace object_map | |
149 | } // namespace librbd |