philips-tv-speicher-voll/patches/usb-freesize/PATCH-PLAN.md

Patch plan – reliable USB free-space reporting

Target

/system/framework/tvfw.jar, UsbVolumeListerImpl.getVolumes(String), SHA-256 a0061795d87cf76c9b739e32022ab3d8c29f47ed01ddc1eee189dd815a8d11ad.

Java pseudodiff

- long freeMiB = -1;
- if (SystemProperties.get("sys.mtk.dmremoteservice.ready").equals("1"))
-     free = deviceManager.getMountPoint(path).mFreeSize;
+ long freeMiB = -1;
+ boolean ready = SystemProperties.getBoolean(
+     "vendor.mtk.dmremoteservice.ready",
+     SystemProperties.getBoolean("sys.mtk.dmremoteservice.ready", false));
+ if (ready) freeMiB = safeDmFreeKiB(path) / 1024L;
+ if (freeMiB < 0 || freeMiB > totalMiB) {
+     try { freeMiB = new StatFs(path).getAvailableBytes() / (1024L * 1024L); }
+     catch (RuntimeException e) { freeMiB = UNKNOWN_MIB; }
+ }

The existing UsbVolume field contract is MiB on the MediaTek-ready path, so the fallback must retain MiB rather than mixing raw bytes. Resolve the path from the current VolumeInfo: public uses its mounted path; private/adopted uses /mnt/expand/<fsUuid>. Only return a numeric zero when a successful filesystem query actually reports zero; otherwise expose unknown or omit the volume. Use long end-to-end.

Compatibility / smali

Supporting both old and vendor-prefixed properties avoids regressions across MediaTek branches, but the correctness guarantee comes from StatFs, not the property spelling. A smali patch adds guarded StatFs.<init>, getAvailableBytes, range validation and exception handling. Framework-JAR replacement requires shared-library/client-compatible DEX, correct oat handling and AVB/system-image resigning; do not hot-patch the live locked device.

Tests

Public/adopted, ready true/false/missing, removed between enumeration/query, read-only volume, >2-TiB arithmetic, zero genuinely full, reinsertion and path change. Compare against df within filesystem allocation tolerance.