storage: fix VFS corruption, ISO9660 hang, OOM; add notepad, file picker, fdtable, GPT, async I/O

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VFS fixes:
- GetDirectoryListing(otVDIRECTORY) now returns a heap-allocated snapshot
  instead of a raw live-tree pointer; FreeDirectoryListing no longer
  corrupts the VFS tree (fixes page fault on repeated navigation)
- volumeGetDirectories: guard LL_Size > 0 before loop to prevent uint32
  underflow (0-1 = 0xFFFFFFFF) causing 4B kalloc iterations -> OOM
- Free entry^.fileName and dirList in all branches (memory leak fix)

iso9660:
- equalsIgnoreCase: guard la=0 before loop (same uint32 underflow bug)
- readDirectoryEntries/resolvePath: add 65536/256-iter safety caps

storagemanager:
- Strip debug syslog calls that were allocating 6+ strings per I/O
  (hundreds of I/Os x 6 allocs exhausted the heap)

Process manager:
- Per-process FDTable and Cwd initialised on create, freed on reap
- proc_await: use pointer-indirection spin per lesson #6 (FPC caches
  non-volatile reads; raw while flag=0 returns immediately)
- graphicsrefresh: move LVGL handler from timer ISR (IF=0) to a
  dedicated process so LVGL callbacks can call blocking I/O

New units:
- fdtable.pas: per-process file descriptor table (fd_alloc/get/close)
- iorequest.pas: heap allocation helpers for TIORequest
- gpt.pas: GPT header/entry read + CRC validation
- filepicker.pas: reusable OS-level open/save file picker dialog
- notepad.pas: GUI text editor with selection, indent, save-as

Shell commands (diskcmd, partcmd, volcmd, diskutil):
- Route output to stdout_buf instead of syslog (lesson #4)
- diskutil: async add/remove/format partition; cache-based device display

Add Apache 2.0 license headers to storagemanager.pas, iso9660.pas,
fat32.pas, storagetest.pas

Lessons learnt: #9 VFS listing must return snapshot (not live pointer)

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This commit is contained in:

Aaron committed 2026-03-07 18:58:32 +00:00

1 parent 789fb7971a

commit deb513c925

32 files changed

+5100 -1854

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