Christopher Haster 692f0c542e Naive implementation of resizable entries ...

Now, with the off, diff, and len parameters in each commit entry, we can build
up directory commits that resize entries. This adds complexity but opens
up the directory blocks to be much more flexible.

The main concern is that resizing entries can push around neighboring entries
in surprising ways, such as pushing them into new directory blocks when a
directory splits. This can break littlefs's internal logic in how it tracks
in-flight entries. The most problematic example being open files.

Fortunately, this is helped by a global linked-list of all files and
directories opened by the filesystem. As entries change size, the state
of open files/dirs may be updated as needed. Note this already needed to
exist for the ability to remove files/dirs, which has the same issue.

2018-10-09 23:02:09 -05:00

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