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staging: erofs: introduce workstation for decompression
This patch introduces another concept used by the unzip subsystem called 'workstation'. It can be seen as a sparse array that stores pointers pointed to data structures related to the corresponding physical blocks. All lookup cases are protected by RCU read lock. Besides, reference count and spin_lock are also introduced to manage its lifetime and serialize all update operations. 'workstation' is currently implemented on the in-kernel radix tree approach for backward compatibility. With the evolution of linux kernel, it could be migrated into XArray implementation in the future. Signed-off-by: Gao Xiang <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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