CONFIG_OVERLAY_FS_METACOPY: Overlayfs: turn on metadata only copy up feature by default

General informations

The Linux kernel configuration item CONFIG_OVERLAY_FS_METACOPY:

• prompt: Overlayfs: turn on metadata only copy up feature by default
• type: bool
• depends on: CONFIG_OVERLAY_FS
• defined in fs/overlayfs/Kconfig
• found in Linux kernels: 4.19–4.20, 5.0–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

If this config option is enabled then overlay filesystems will copy up only metadata where appropriate and data copy up will happen when a file is opened for WRITE operation. It is still possible to turn off this feature globally with the "metacopy=off" module option or on a filesystem instance basis with the "metacopy=off" mount option.

Note, that this feature is not backward compatible. That is, mounting an overlay which has metacopy only inodes on a kernel that doesn't support this feature will have unexpected results.

If unsure, say N.

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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