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[block-manager] ensure the superblock cannot be taken concurrently with any other lock.

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This commit is contained in:
Joe Thornber
2014-08-21 12:18:05 +01:00
parent 3724f78a13
commit 0d3942cae8
4 changed files with 13 additions and 1 deletions
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6
persistent-data/block.tcc
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@@ -268,6 +268,9 @@ namespace persistent_data {
block_manager<BlockSize>::superblock(block_address location,
typename bcache::validator::ptr v)
{
if (bc_.get_nr_locked() > 0)
throw std::runtime_error("attempt to lock superblock while other locks are still held");
block_cache::block &b = bc_.get(location, block_cache::GF_BARRIER, v);
return write_ref(b, superblock_ref_count_);
}
@@ -277,6 +280,9 @@ namespace persistent_data {
block_manager<BlockSize>::superblock_zero(block_address location,
typename bcache::validator::ptr v)
{
if (bc_.get_nr_locked() > 0)
throw std::runtime_error("attempt to lock superblock while other locks are still held");
block_cache::block &b = bc_.get(location, block_cache::GF_ZERO | block_cache::GF_BARRIER, v);
return write_ref(b, superblock_ref_count_);
}