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Added opt-in lazy sector release to reduce O(N²) deletion (issue #70) (#71)

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WARNING: This feature is brand new and has not been tested beyond the
existing regression suite.  It should be thoroughly tested — including
stress, power-loss, and wear-levelling scenarios — before being used in
any production system.

When LX_NAND_FLASH_ENABLE_LAZY_SECTOR_RELEASE is defined and free blocks
exceed LX_NAND_FLASH_SECTOR_RELEASE_LAZY_THRESHOLD (default 10), releasing
a sector from a full block defers the copy+erase.  A tombstone page is
written to a freshly-allocated block; the old full block is flagged
COMPACTION_PENDING in its block status and recorded in a new per-LG
compaction table.  Compaction (merge + erase) is triggered lazily:

  * sector_write: before writing to a full block with a pending source
  * block_data_move: intercepts wear-levelling moves for pending LGs
  * defragment: iterates all pending LGs (now actually implemented)
  * block_allocate: emergency compaction when the free list is empty

Reads transparently fall back to the compaction-pending block when the
primary block does not contain the requested sector.

Crash recovery is handled in open_extended:
  - Phase 1: detects COMPACTION_PENDING blocks and either clears the flag
    (crash before mapping update — abort) or rebuilds compaction_table
    (crash after mapping update — resume deferred compaction).
  - Phase 2: erases orphaned ALLOCATED blocks not present in any mapping.

Without the flag, all paths remain unchanged and defragment returns
LX_NOT_SUPPORTED as before.

Fixes: https://github.com/eclipse-threadx/levelx/issues/70

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Frédéric Desbiens
2026-06-02 11:25:12 -04:00
committed by GitHub
co-authored by Copilot
parent a46b74fb8a
commit bfb39676df
11 changed files with 990 additions and 0 deletions
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common/CMakeLists.txt
+1
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@@ -23,6 +23,7 @@ target_sources(${PROJECT_NAME} PRIVATE
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_format_extended.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_free_block_list_add.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_initialize.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_logical_group_compact.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_mapped_block_list_add.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_mapped_block_list_get.c
${CMAKE_CURRENT_LIST_DIR}/src/lx_nand_flash_mapped_block_list_remove.c