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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "common/SloppyCRCMap.h"
#include "common/Formatter.h"
using namespace std;
using ceph::bufferlist;
void SloppyCRCMap::write(uint64_t offset, uint64_t len, const bufferlist& bl,
std::ostream *out)
{
int64_t left = len;
uint64_t pos = offset;
unsigned o = offset % block_size;
if (o) {
crc_map.erase(offset - o);
if (out)
*out << "write invalidate " << (offset - o) << "\n";
pos += (block_size - o);
left -= (block_size - o);
}
while (left >= block_size) {
bufferlist t;
t.substr_of(bl, pos - offset, block_size);
crc_map[pos] = t.crc32c(crc_iv);
if (out)
*out << "write set " << pos << " " << crc_map[pos] << "\n";
pos += block_size;
left -= block_size;
}
if (left > 0) {
crc_map.erase(pos);
if (out)
*out << "write invalidate " << pos << "\n";
}
}
int SloppyCRCMap::read(uint64_t offset, uint64_t len, const bufferlist& bl,
std::ostream *err)
{
int errors = 0;
int64_t left = len;
uint64_t pos = offset;
unsigned o = offset % block_size;
if (o) {
pos += (block_size - o);
left -= (block_size - o);
}
while (left >= block_size) {
// FIXME: this could be more efficient if we avoid doing a find()
// on each iteration
std::map<uint64_t,uint32_t>::iterator p = crc_map.find(pos);
if (p != crc_map.end()) {
bufferlist t;
t.substr_of(bl, pos - offset, block_size);
uint32_t crc = t.crc32c(crc_iv);
if (p->second != crc) {
errors++;
if (err)
*err << "offset " << pos << " len " << block_size
<< " has crc " << crc << " expected " << p->second << "\n";
}
}
pos += block_size;
left -= block_size;
}
return errors;
}
void SloppyCRCMap::truncate(uint64_t offset)
{
offset -= offset % block_size;
std::map<uint64_t,uint32_t>::iterator p = crc_map.lower_bound(offset);
while (p != crc_map.end())
crc_map.erase(p++);
}
void SloppyCRCMap::zero(uint64_t offset, uint64_t len)
{
int64_t left = len;
uint64_t pos = offset;
unsigned o = offset % block_size;
if (o) {
crc_map.erase(offset - o);
pos += (block_size - o);
left -= (block_size - o);
}
while (left >= block_size) {
crc_map[pos] = zero_crc;
pos += block_size;
left -= block_size;
}
if (left > 0)
crc_map.erase(pos);
}
void SloppyCRCMap::clone_range(uint64_t offset, uint64_t len,
uint64_t srcoff, const SloppyCRCMap& src,
std::ostream *out)
{
int64_t left = len;
uint64_t pos = offset;
uint64_t srcpos = srcoff;
unsigned o = offset % block_size;
if (o) {
crc_map.erase(offset - o);
pos += (block_size - o);
srcpos += (block_size - o);
left -= (block_size - o);
if (out)
*out << "clone_range invalidate " << (offset - o) << "\n";
}
while (left >= block_size) {
// FIXME: this could be more efficient.
if (block_size == src.block_size) {
map<uint64_t,uint32_t>::const_iterator p = src.crc_map.find(srcpos);
if (p != src.crc_map.end()) {
crc_map[pos] = p->second;
if (out)
*out << "clone_range copy " << pos << " " << p->second << "\n";
} else {
crc_map.erase(pos);
if (out)
*out << "clone_range invalidate " << pos << "\n";
}
} else {
crc_map.erase(pos);
if (out)
*out << "clone_range invalidate " << pos << "\n";
}
pos += block_size;
srcpos += block_size;
left -= block_size;
}
if (left > 0) {
crc_map.erase(pos);
if (out)
*out << "clone_range invalidate " << pos << "\n";
}
}
void SloppyCRCMap::encode(bufferlist& bl) const
{
ENCODE_START(1, 1, bl);
encode(block_size, bl);
encode(crc_map, bl);
ENCODE_FINISH(bl);
}
void SloppyCRCMap::decode(bufferlist::const_iterator& bl)
{
DECODE_START(1, bl);
uint32_t bs;
decode(bs, bl);
set_block_size(bs);
decode(crc_map, bl);
DECODE_FINISH(bl);
}
void SloppyCRCMap::dump(ceph::Formatter *f) const
{
f->dump_unsigned("block_size", block_size);
f->open_array_section("crc_map");
for (map<uint64_t,uint32_t>::const_iterator p = crc_map.begin(); p != crc_map.end(); ++p) {
f->open_object_section("crc");
f->dump_unsigned("offset", p->first);
f->dump_unsigned("crc", p->second);
f->close_section();
}
f->close_section();
}
void SloppyCRCMap::generate_test_instances(list<SloppyCRCMap*>& ls)
{
ls.push_back(new SloppyCRCMap);
ls.push_back(new SloppyCRCMap(2));
bufferlist bl;
bl.append("some data");
ls.back()->write(1, bl.length(), bl);
ls.back()->write(10, bl.length(), bl);
ls.back()->zero(4, 2);
}
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