storage: Add util classes for composing block devices #3569
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Adopted in the SDBlockDevice and MemBlockDevice taken from mbed 2
Enables persistant storage between de/reinitialization cycles
Relatively unmodified, except for the addition of support for interchangeable block devices
per @sg- on mbed-os#3449
options: MemBlockDevice - Same as mbed 2 class, but ambiguous RAMBlockDevice - May be ambiguous with BD on unmanaged RAM HeapBlockDevice - Seems the most reasonable name
- Changed name to I2CEepromBlockDevice - Renamed functions - Reduced handling of block borders - Reduced trust of I2C::write array function, may have issues - Conformed to mbed style guide where necessary
ChainingBlockDevice
- Supports chaining multiple block devices together with a
sequential address space. Useful for combining multiple
memory devices together to expand storage capacity.
SlicingBlockDevice
- Supports mapping a slice of a block device to a new block
device. Useful for repurposing regions of a block device
for less aware algorithms.
ClusteringBlockDevice
- Supports clustering small blocks into larger blocks.
Useful for matching the required block size of less aware
algorithms.
DividingBlockDevice
- Supports dividing large blocks into smaller blocks.
Uses internal buffer to hold large blocks.
|
Merged/continued over here #3671 Chaining/Slicing is still around, but clustering/dividing have been integrated implicitly into the core block device interface. |
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sequential address space. Useful for combining multiple
memory devices together to expand storage capacity.
device. Useful for repurposing regions of a block device
for less aware algorithms.
Useful for matching the required block size of less aware
algorithms.
Uses internal buffer to hold large blocks.
Not sure if these should be included in mbed OS or provided in an external library, but I did find them quite useful for adding flexibility to the block devices.
dependent on #3449, #3564
relevant commit range 882d9d4...geky:bd-util
cc @simonqhughes, @c1728p9, @theotherjimmy