Kernel: Add a write cache to DiskBackedFS.

This way you can spam small write()s on a file without the kernel writing
to disk every single time. Flushes are included in the FS::sync() operation
and will get triggered regularly by syncd. :^)

1 files changed, 7 insertions, 0 deletions

diff --git a/AK/ByteBuffer.h b/AK/ByteBuffer.h
index f263c1c13b..45b213713d 100644
--- a/AK/ByteBuffer.h
+++ b/AK/ByteBuffer.h
@@ -118,6 +118,13 @@ public:
     void* end_pointer() { return m_impl ? m_impl->end_pointer() : nullptr; }
     const void* end_pointer() const { return m_impl ? m_impl->end_pointer() : nullptr; }
 
+    ByteBuffer isolated_copy() const
+    {
+        if (!m_impl)
+            return { };
+        return copy(m_impl->pointer(), m_impl->size());
+    }
+
     // NOTE: trim() does not reallocate.
     void trim(ssize_t size)
     {