Kernel: Enable metacopy and redirect_dir in overlayfs #170
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dongsupark
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Enable CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed. Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation. Enable CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line. When turned on, overlayfs will copy up directory first, before the actual contents. flatcar/Flatcar#170
dongsupark
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Nov 17, 2020
Enable CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed. Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation. Enable CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line. When turned on, overlayfs will copy up directory first, before the actual contents. flatcar/Flatcar#170
dongsupark
added a commit
to flatcar/coreos-overlay
that referenced
this issue
Nov 17, 2020
Enable CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed. Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation. Enable CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line. When turned on, overlayfs will copy up directory first, before the actual contents. See also flatcar/Flatcar#170
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Filed PR flatcar/coreos-overlay#691 |
t-lo
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Nov 18, 2020
Enable CONFIG_OVERLAY_FS_METACOPY, metadata only copy up feature in overlayfs. When turned on, overlayfs will only copy up metadata when a metadata specific operation like chown/chmod is performed. Full file will be copied up later when file is opened for WRITE operation. More or less like delayed data copy up operation. Enable CONFIG_OVERLAY_FS_REDIRECT_DIR, which is equivalent to "redirect_dir=on" in the kernel command-line. When turned on, overlayfs will copy up directory first, before the actual contents. See also flatcar/Flatcar#170
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Current situation
At the moment, Kernel module
overlayenables its features, neithermetacopynorredirect_dir, as it is given so by default. According to the overlayfs developer Amir Goldstein at LPC 2020, distros and container runtimes should enable both features for overlayfs.We should do so, and go through the ordinary CI to see if there is any regression.
Kernel configs:
CONFIG_OVERLAY_FS_METACOPYCONFIG_OVERLAY_FS_REDIRECT_DIRSee also https://github.com/amir73il/overlayfs/wiki .
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