Commits on Sep 26, 2023

1. Disable overlayfs features not used by Docker …

   Currently `CONFIG_OVERLAY_FS_METACOPY` and
   `CONFIG_OVERLAY_FS_REDIRECT_DIR` kernel options are enabled but not
   preferred by Docker. The metadata copy feature is disabled by default,
   and also not actively used by the overlayfs2 driver (see
   moby/moby@2c3d1f7).
   So the metadata copy config is not really problematic per se. However,
   it enables the redirect_dir feature. And a kernel which has the
   redirect_dir feature compiled in also enables it by default. This
   actually makes the overlayfs2 driver to fallback to naive diff, which
   is, from what I understand, slower than the overlayfs native diff (see
   also
   moby/moby@49c3a7c).
   The Docker daemon is also reporting this on startup:
   
     Not using native diff for overlay2, this may cause degraded performance
     for building images: kernel has CONFIG_OVERLAY_FS_REDIRECT_DIR enabled
   
   Currently `CONFIG_OVERLAY_FS_METACOPY` is enabled, and it also enables
   `CONFIG_OVERLAY_FS_REDIRECT_DIR`. There was already a previous attempt
   to disable the latter (see home-assistant#2067).
   
   Disable both configs explicitly until Docker is able to use them.

   

   agners committed Sep 26, 2023
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