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Kernel: Update block cache on write.

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If a block is present in the cache, just overwrite the cached block.
This commit is contained in:
Andreas Kling 2019-02-11 13:18:24 +01:00
parent 26230c0647
commit 14c0f18de9
1 changed files with 14 additions and 0 deletions
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14
Kernel/DiskBackedFileSystem.cpp
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@ -60,6 +60,12 @@ bool DiskBackedFS::write_block(unsigned index, const ByteBuffer& data)
kprintf("DiskBackedFileSystem::write_block %u, size=%u\n", index, data.size());
#endif
ASSERT(data.size() == block_size());
{
LOCKER(block_cache().lock());
if (auto* cached_block = block_cache().resource().get({ fsid(), index }))
cached_block->m_buffer = data;
}
DiskOffset base_offset = static_cast<DiskOffset>(index) * static_cast<DiskOffset>(block_size());
return device().write(base_offset, block_size(), data.pointer());
}
@ -69,6 +75,14 @@ bool DiskBackedFS::write_blocks(unsigned index, unsigned count, const ByteBuffer
#ifdef DBFS_DEBUG
kprintf("DiskBackedFileSystem::write_blocks %u x%u\n", index, count);
#endif
// FIXME: Maybe reorder this so we send out the write commands before updating cache?
{
LOCKER(block_cache().lock());
for (unsigned i = 0; i < count; ++i) {
if (auto* cached_block = block_cache().resource().get({ fsid(), index + i }))
cached_block->m_buffer = data.slice(i * block_size(), block_size());
}
}
DiskOffset base_offset = static_cast<DiskOffset>(index) * static_cast<DiskOffset>(block_size());
return device().write(base_offset, count * block_size(), data.pointer());
}