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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/io/Utils.h"
#include "include/buffer.h"
#include "osd/osd_types.h"
namespace librbd {
namespace io {
namespace util {
bool assemble_write_same_extent(
const ObjectExtent &object_extent, const ceph::bufferlist& data,
ceph::bufferlist *ws_data, bool force_write) {
size_t data_len = data.length();
if (!force_write) {
bool may_writesame = true;
for (auto& q : object_extent.buffer_extents) {
if (!(q.first % data_len == 0 && q.second % data_len == 0)) {
may_writesame = false;
break;
}
}
if (may_writesame) {
ws_data->append(data);
return true;
}
}
for (auto& q : object_extent.buffer_extents) {
bufferlist sub_bl;
uint64_t sub_off = q.first % data_len;
uint64_t sub_len = data_len - sub_off;
uint64_t extent_left = q.second;
while (extent_left >= sub_len) {
sub_bl.substr_of(data, sub_off, sub_len);
ws_data->claim_append(sub_bl);
extent_left -= sub_len;
if (sub_off) {
sub_off = 0;
sub_len = data_len;
}
}
if (extent_left) {
sub_bl.substr_of(data, sub_off, extent_left);
ws_data->claim_append(sub_bl);
}
}
return false;
}
} // namespace util
} // namespace io
} // namespace librbd
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