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Add simplified interface to read blockstore bitmaps synchronously

rdma-zerocopy
Vitaliy Filippov 5 months ago
parent
commit
f01eea07d3
  1. 5
      src/blockstore.cpp
  2. 3
      src/blockstore.h
  3. 3
      src/blockstore_impl.h
  4. 47
      src/blockstore_read.cpp

5
src/blockstore.cpp

@ -38,6 +38,11 @@ void blockstore_t::enqueue_op(blockstore_op_t *op)
impl->enqueue_op(op);
}
int blockstore_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
{
return impl->read_bitmap(oid, target_version, bitmap, result_version);
}
std::unordered_map<object_id, uint64_t> & blockstore_t::get_unstable_writes()
{
return impl->unstable_writes;

3
src/blockstore.h

@ -179,6 +179,9 @@ public:
// Submission
void enqueue_op(blockstore_op_t *op);
// Simplified synchronous operation: get object bitmap & current version
int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
// Unstable writes are added here (map of object_id -> version)
std::unordered_map<object_id, uint64_t> & get_unstable_writes();

3
src/blockstore_impl.h

@ -324,6 +324,9 @@ public:
// Submission
void enqueue_op(blockstore_op_t *op);
// Simplified synchronous operation: get object bitmap & current version
int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
// Unstable writes are added here (map of object_id -> version)
std::unordered_map<object_id, uint64_t> unstable_writes;

47
src/blockstore_read.cpp

@ -268,3 +268,50 @@ void blockstore_impl_t::handle_read_event(ring_data_t *data, blockstore_op_t *op
FINISH_OP(op);
}
}
int blockstore_impl_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
{
auto dirty_it = dirty_db.upper_bound((obj_ver_id){
.oid = oid,
.version = UINT64_MAX,
});
if (dirty_it != dirty_db.begin())
dirty_it--;
if (dirty_it != dirty_db.end())
{
while (dirty_it->first.oid == oid)
{
if (target_version >= dirty_it->first.version)
{
if (result_version)
*result_version = dirty_it->first.version;
if (bitmap)
{
void *bmp_ptr = (clean_entry_bitmap_size > sizeof(void*) ? dirty_it->second.bitmap : &dirty_it->second.bitmap);
memcpy(bitmap, bmp_ptr, clean_entry_bitmap_size);
}
return 0;
}
if (dirty_it == dirty_db.begin())
break;
dirty_it--;
}
}
auto clean_it = clean_db.find(oid);
if (clean_it != clean_db.end())
{
if (result_version)
*result_version = clean_it->second.version;
if (bitmap)
{
void *bmp_ptr = get_clean_entry_bitmap(clean_it->second.location, clean_entry_bitmap_size);
memcpy(bitmap, bmp_ptr, clean_entry_bitmap_size);
}
return 0;
}
if (result_version)
*result_version = 0;
if (bitmap)
memset(bitmap, 0, clean_entry_bitmap_size);
return -ENOENT;
}
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