1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "common/ceph_context.h"
#include "common/dout.h"
#include "common/Mutex.h"
#include "common/RWLock.h"
#include "librbd/AioCompletion.h"
#include "librbd/ImageCtx.h"
#include "librbd/internal.h"
#include "librbd/AioRequest.h"
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::AioRequest: "
namespace librbd {
AioRequest::AioRequest() :
m_ictx(NULL), m_ioctx(NULL),
m_object_no(0), m_object_off(0), m_object_len(0),
m_snap_id(CEPH_NOSNAP), m_completion(NULL), m_parent_completion(NULL),
m_hide_enoent(false) {}
AioRequest::AioRequest(ImageCtx *ictx, const std::string &oid,
uint64_t objectno, uint64_t off, uint64_t len,
librados::snap_t snap_id,
Context *completion,
bool hide_enoent) :
m_ictx(ictx), m_ioctx(&ictx->data_ctx), m_oid(oid), m_object_no(objectno),
m_object_off(off), m_object_len(len), m_snap_id(snap_id),
m_completion(completion), m_parent_completion(NULL),
m_hide_enoent(hide_enoent) {}
AioRequest::~AioRequest() {
if (m_parent_completion) {
m_parent_completion->release();
m_parent_completion = NULL;
}
}
void AioRequest::read_from_parent(vector<pair<uint64_t,uint64_t> >& image_extents)
{
assert(!m_parent_completion);
m_parent_completion = aio_create_completion_internal(this, rbd_req_cb);
ldout(m_ictx->cct, 20) << "read_from_parent this = " << this
<< " parent completion " << m_parent_completion
<< " extents " << image_extents
<< dendl;
aio_read(m_ictx->parent, image_extents, NULL, &m_read_data,
m_parent_completion);
}
/** read **/
bool AioRead::should_complete(int r)
{
ldout(m_ictx->cct, 20) << "should_complete " << this << " " << m_oid << " " << m_object_off << "~" << m_object_len
<< " r = " << r << dendl;
if (!m_tried_parent && r == -ENOENT) {
RWLock::RLocker l(m_ictx->snap_lock);
RWLock::RLocker l2(m_ictx->parent_lock);
// calculate reverse mapping onto the image
vector<pair<uint64_t,uint64_t> > image_extents;
Striper::extent_to_file(m_ictx->cct, &m_ictx->layout,
m_object_no, m_object_off, m_object_len,
image_extents);
uint64_t image_overlap = 0;
r = m_ictx->get_parent_overlap(m_snap_id, &image_overlap);
if (r < 0) {
assert(0 == "FIXME");
}
uint64_t object_overlap = m_ictx->prune_parent_extents(image_extents, image_overlap);
if (object_overlap) {
m_tried_parent = true;
read_from_parent(image_extents);
return false;
}
}
return true;
}
int AioRead::send() {
ldout(m_ictx->cct, 20) << "send " << this << " " << m_oid << " " << m_object_off << "~" << m_object_len << dendl;
librados::AioCompletion *rados_completion =
librados::Rados::aio_create_completion(this, rados_req_cb, NULL);
int r;
librados::ObjectReadOperation op;
int flags = m_ictx->get_read_flags(m_snap_id);
if (m_sparse) {
op.sparse_read(m_object_off, m_object_len, &m_ext_map, &m_read_data,
NULL);
} else {
op.read(m_object_off, m_object_len, &m_read_data, NULL);
}
r = m_ioctx->aio_operate(m_oid, rados_completion, &op, m_snap_id, flags, NULL);
rados_completion->release();
return r;
}
/** read **/
AbstractWrite::AbstractWrite()
: m_state(LIBRBD_AIO_WRITE_FLAT),
m_parent_overlap(0) {}
AbstractWrite::AbstractWrite(ImageCtx *ictx, const std::string &oid,
uint64_t object_no, uint64_t object_off, uint64_t len,
vector<pair<uint64_t,uint64_t> >& objectx,
uint64_t object_overlap,
const ::SnapContext &snapc, librados::snap_t snap_id,
Context *completion,
bool hide_enoent)
: AioRequest(ictx, oid, object_no, object_off, len, snap_id, completion,
hide_enoent),
m_state(LIBRBD_AIO_WRITE_FLAT), m_snap_seq(snapc.seq.val)
{
m_object_image_extents = objectx;
m_parent_overlap = object_overlap;
// TODO: find a way to make this less stupid
for (std::vector<snapid_t>::const_iterator it = snapc.snaps.begin();
it != snapc.snaps.end(); ++it) {
m_snaps.push_back(it->val);
}
}
void AbstractWrite::guard_write()
{
if (has_parent()) {
m_state = LIBRBD_AIO_WRITE_GUARD;
m_write.assert_exists();
ldout(m_ictx->cct, 20) << __func__ << " guarding write" << dendl;
}
}
bool AbstractWrite::should_complete(int r)
{
ldout(m_ictx->cct, 20) << "write " << this << " " << m_oid << " " << m_object_off << "~" << m_object_len
<< " should_complete: r = " << r << dendl;
bool finished = true;
switch (m_state) {
case LIBRBD_AIO_WRITE_GUARD:
ldout(m_ictx->cct, 20) << "WRITE_CHECK_GUARD" << dendl;
if (r == -ENOENT) {
RWLock::RLocker l(m_ictx->snap_lock);
RWLock::RLocker l2(m_ictx->parent_lock);
/*
* Parent may have disappeared; if so, recover by using
* send_copyup() to send the original write req (the copyup
* operation itself will be a no-op, since someone must have
* populated the child object while we weren't looking).
* Move to WRITE_FLAT state as we'll be done with the
* operation once the null copyup completes.
*/
if (m_ictx->parent == NULL) {
ldout(m_ictx->cct, 20) << "parent is gone; do null copyup " << dendl;
m_state = LIBRBD_AIO_WRITE_FLAT;
send_copyup();
finished = false;
break;
}
// If parent still exists, overlap might also have changed.
uint64_t newlen = m_ictx->prune_parent_extents(
m_object_image_extents, m_ictx->parent_md.overlap);
// copyup the entire object up to the overlap point, if any
if (newlen != 0) {
ldout(m_ictx->cct, 20) << "should_complete(" << this << ") overlap "
<< m_ictx->parent_md.overlap << " newlen "
<< newlen << " image_extents"
<< m_object_image_extents << dendl;
m_state = LIBRBD_AIO_WRITE_COPYUP;
read_from_parent(m_object_image_extents);
} else {
ldout(m_ictx->cct, 20) << "should_complete(" << this
<< "): parent overlap now 0" << dendl;
m_object_image_extents.clear();
m_state = LIBRBD_AIO_WRITE_FLAT;
send_copyup();
}
finished = false;
break;
}
if (r < 0) {
ldout(m_ictx->cct, 20) << "error checking for object existence" << dendl;
break;
}
break;
case LIBRBD_AIO_WRITE_COPYUP:
ldout(m_ictx->cct, 20) << "WRITE_COPYUP" << dendl;
m_state = LIBRBD_AIO_WRITE_GUARD;
if (r < 0)
return should_complete(r);
send_copyup();
finished = false;
break;
case LIBRBD_AIO_WRITE_FLAT:
ldout(m_ictx->cct, 20) << "WRITE_FLAT" << dendl;
// nothing to do
break;
default:
lderr(m_ictx->cct) << "invalid request state: " << m_state << dendl;
assert(0);
}
return finished;
}
int AbstractWrite::send() {
ldout(m_ictx->cct, 20) << "send " << this << " " << m_oid << " " << m_object_off << "~" << m_object_len << dendl;
librados::AioCompletion *rados_completion =
librados::Rados::aio_create_completion(this, NULL, rados_req_cb);
int r;
assert(m_write.size());
r = m_ioctx->aio_operate(m_oid, rados_completion, &m_write,
m_snap_seq, m_snaps);
rados_completion->release();
return r;
}
void AbstractWrite::send_copyup() {
if (!m_read_data.is_zero())
m_copyup.exec("rbd", "copyup", m_read_data);
add_copyup_ops();
librados::AioCompletion *rados_completion =
librados::Rados::aio_create_completion(this, NULL, rados_req_cb);
m_ictx->md_ctx.aio_operate(m_oid, rados_completion, &m_copyup,
m_snap_seq, m_snaps);
rados_completion->release();
}
}
|
