Andreas Kling c1d3ac7108 Ext2FS: Fix unpopulated block list cache after mkdir() ...

When creating a new directory, we set the initial size to 1 block.
This meant that we were allocating a block up front, but the Inode's
internal block list cache was not populated with this block.

This broke write_bytes() on a new directory, since it assumed that
the block list cache would be up to date if the call to write_bytes()
would not change the directory's size.

This patch fixes the issue in two ways: First, we cache the initial
block list created for new directories.
Second, we now repopulate the block list cache in write_bytes() if it
is empty when we get there. This is basically just a safety fallback
to avoid having this kind of bug in the future.

2019-11-03 10:22:09 +01:00

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