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Added a bit of documentation, minor cleanup.

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* Documented the cached_block::transaction, and previous_transaction
  members.
This commit is contained in:
Axel Dörfler
2012-07-20 00:03:37 +02:00
parent ca741c4835
commit 0579a69564
1 changed files with 11 additions and 1 deletions
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src/system/kernel/cache/block_cache.cpp
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+11 -1
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@@ -89,7 +89,17 @@ struct cached_block {
bool busy_reading_waiters : 1;
bool busy_writing_waiters : 1;
cache_transaction* transaction;
// This is the current active transaction, if any, the block is
// currently in (meaning was changed as a part of it).
cache_transaction* previous_transaction;
// This is set to the last transaction that was ended containing this
// block. In this case, the block has not yet written back yet, and
// the changed data is either in current_data, or original_data -- the
// latter if the block is already being part of another transaction.
// There can only be one previous transaction, so when the active
// transaction ends, the changes of the previous transaction have to
// be written back before that transaction becomes the next previous
// transaction.
bool CanBeWritten() const;
int32 LastAccess() const
@@ -1189,7 +1199,7 @@ BlockWriter::WriteBlock(block_cache* cache, cached_block* block)
void*
BlockWriter::_Data(cached_block* block) const
{
return block->previous_transaction && block->original_data
return block->previous_transaction != NULL && block->original_data != NULL
? block->original_data : block->current_data;
// We first need to write back changes from previous transactions
}