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For better compatibility with GPL v2
With permissions from:
- aldot
- Sim4n6
- jrast
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Suggested by sn00pster, LFS_CONFIG is an opt-in user provided
configuration file that will override the util implementation in
lfs_util.h. This is useful for allowing system-specific overrides
without needing to rely on git merges or other forms of patching
for updates.
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Due to employee contract
Per ARM license remains under Apache 2.0
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Before, the littlefs relied on the underlying block device
to report corruption that occurs when writing data to disk.
This requirement is easy to miss or implement incorrectly, since
the error detection is only required when a block becomes corrupted,
which is very unlikely to happen until late in the block device's
lifetime.
The littlefs can detect corruption itself by reading back written data.
This requires a bit of care to reuse the available buffers, and may rely
on checksums to avoid additional RAM requirements.
This does have a runtime penalty with the extra read operations, but
should make the littlefs much more robust to different implementations.
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Adopted buffer followed by size. The other order was original
chosen due to some other functions with a more complicated
parameter list.
This convention is important, as the bd api is one of the main
apis facing porting efforts.
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- Removed lfs_config.h, distributed between lfs.h and lfs_util.h
- Moved some functions that felt out of place
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After quite a bit of prototyping, settled on the following functions:
- lfs_dir_alloc - create a new dir
- lfs_dir_fetch - load and check a dir pair from disk
- lfs_dir_commit - save a dir pair to disk
- lfs_dir_shift - shrink a dir pair to disk
- lfs_dir_append - add a dir entry, creating dirs if needed
- lfs_dir_remove - remove a dir entry, dropping dirs if needed
Additionally, followed through with a few other tweaks
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