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[validators] Move the btree node validator into a separate file.

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This commit is contained in:
Joe Thornber
2015-08-11 11:58:07 +01:00
parent 5d28c05dc3
commit c32aaab028
5 changed files with 72 additions and 61 deletions
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53
persistent-data/validators.cc Normal file
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#include "persistent-data/block.h"
#include "persistent-data/checksum.h"
#include "persistent-data/data-structures/btree_disk_structures.h"
#include "persistent-data/errors.h"
#include "persistent-data/validators.h"
using namespace bcache;
using namespace persistent_data;
//----------------------------------------------------------------
namespace {
using namespace btree_detail;
struct btree_node_validator : public bcache::validator {
virtual void check(void const *raw, block_address location) const {
disk_node const *data = reinterpret_cast<disk_node const *>(raw);
node_header const *n = &data->header;
crc32c sum(BTREE_CSUM_XOR);
sum.append(&n->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
if (sum.get_sum() != to_cpu<uint32_t>(n->csum)) {
std::ostringstream out;
out << "bad checksum in btree node (block " << location << ")";
throw checksum_error(out.str());
}
if (to_cpu<uint64_t>(n->blocknr) != location) {
std::ostringstream out;
out << "bad block nr in btree node (block = " << location << ")";
throw checksum_error(out.str());
}
}
virtual void prepare(void *raw, block_address location) const {
disk_node *data = reinterpret_cast<disk_node *>(raw);
node_header *n = &data->header;
n->blocknr = to_disk<base::le64, uint64_t>(location);
crc32c sum(BTREE_CSUM_XOR);
sum.append(&n->flags, MD_BLOCK_SIZE - sizeof(uint32_t));
n->csum = to_disk<base::le32>(sum.get_sum());
}
};
}
//----------------------------------------------------------------
bcache::validator::ptr persistent_data::create_btree_node_validator()
{
return bcache::validator::ptr(new btree_node_validator());
}
//----------------------------------------------------------------