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[block] make sure we can change validators

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This commit is contained in:
Joe Thornber
2013-04-26 15:54:15 +01:00
parent 5367631c8c
commit b1e0ca2207
3 changed files with 206 additions and 15 deletions
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3
persistent-data/block.h
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@@ -119,7 +119,8 @@ namespace persistent_data {
void flush();
void change_validator(typename block_manager<BlockSize>::validator::ptr v);
void change_validator(typename block_manager<BlockSize>::validator::ptr v,
bool check = true);
typename block_io<BlockSize>::ptr io_;
block_address location_;

43
persistent-data/block.tcc
View File

@@ -210,8 +210,9 @@ block_manager<BlockSize>::block::block(typename block_io<BlockSize>::ptr io,
dirty_(false)
{
if (zero) {
// FIXME: duplicate memset
memset(data_->raw(), 0, BlockSize);
dirty_ = true;
dirty_ = true; // redundant?
} else {
io_->read_buffer(location_, *data_);
validator_->check(*data_, location_);
@@ -237,14 +238,19 @@ block_manager<BlockSize>::block::flush()
template <uint32_t BlockSize>
void
block_manager<BlockSize>::block::change_validator(typename block_manager<BlockSize>::validator::ptr v)
block_manager<BlockSize>::block::change_validator(typename block_manager<BlockSize>::validator::ptr v,
bool check)
{
if (v.get() != validator_.get()) {
if (dirty_)
// It may have already happened, by calling
// this we ensure we're consistent.
validator_->prepare(*data_, location_);
validator_ = v;
validator_->check(*data_, location_);
if (check)
validator_->check(*data_, location_);
}
}
@@ -383,7 +389,10 @@ block_manager<BlockSize>::write_lock(block_address location,
boost::optional<typename block::ptr> cached_block = cache_.get(location);
if (cached_block) {
(*cached_block)->check_write_lockable();
typename block::ptr cb = *cached_block;
cb->check_write_lockable();
cb->change_validator(v);
return write_ref(*this, *cached_block);
}
@@ -409,8 +418,11 @@ block_manager<BlockSize>::write_lock_zero(block_address location,
boost::optional<typename block::ptr> cached_block = cache_.get(location);
if (cached_block) {
(*cached_block)->check_write_lockable();
typename block::ptr cb = *cached_block;
cb->check_write_lockable();
cb->change_validator(v, false);
memset((*cached_block)->data_->raw(), 0, BlockSize);
return write_ref(*this, *cached_block);
}
@@ -436,9 +448,11 @@ block_manager<BlockSize>::superblock(block_address location,
boost::optional<typename block::ptr> cached_block = cache_.get(location);
if (cached_block) {
(*cached_block)->check_write_lockable();
(*cached_block)->bt_ = BT_SUPERBLOCK;
(*cached_block)->validator_ = v;
typename block::ptr cb = *cached_block;
cb->check_write_lockable();
cb->bt_ = BT_SUPERBLOCK;
cb->change_validator(v);
return write_ref(*this, *cached_block);
}
@@ -464,15 +478,16 @@ block_manager<BlockSize>::superblock_zero(block_address location,
boost::optional<typename block::ptr> cached_block = cache_.get(location);
if (cached_block) {
(*cached_block)->check_write_lockable();
memset((*cached_block)->data_->raw(), 0, BlockSize); // FIXME: add a zero method to buffer
(*cached_block)->validator_ = v;
typename block::ptr cb = *cached_block;
cb->check_write_lockable();
cb->bt_ = BT_SUPERBLOCK;
cb->change_validator(v, false);
memset(cb->data_->raw(), 0, BlockSize); // FIXME: add a zero method to buffer
return write_ref(*this, *cached_block);
}
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK,
mk_validator(new noop_validator), true));
b->validator_ = v;
typename block::ptr b(new block(io_, location, BT_SUPERBLOCK, v, true));
cache_.insert(b);
return write_ref(*this, b);