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[18.09 backport] overlay2: use index=off if possible (fix EBUSY on mount)#84
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seemethere merged 2 commits intodocker-archive:18.09from Nov 21, 2018
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This simplifies the code a lot. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commit a55d325) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
As pointed out in moby#37970, Docker overlay driver can't work with index=on feature of the Linux kernel "overlay" filesystem. In case the global default is set to "yes", Docker will fail with EBUSY when trying to mount, like this: > error creating overlay mount to ...../merged: device or resource busy and the kernel log should contain something like: > overlayfs: upperdir is in-use by another mount, mount with > '-o index=off' to override exclusive upperdir protection. A workaround is to set index=off in overlay kernel module parameters, or even recompile the kernel with CONFIG_OVERLAY_FS_INDEX=n in .config. Surely this is not always practical or even possible. The solution, as pointed out my Amir Goldstein (as well as the above kernel message:) is to use 'index=off' option when mounting. NOTE since older (< 4.13rc1) kernels do not support "index=" overlayfs parameter, try to figure out whether the option is supported. In case it's not possible to figure out, assume it is not. NOTE the default can be changed anytime (by writing to /sys/module/overlay/parameters/index) so we need to always use index=off. [v2: move the detection code to Init()] [v3: don't set index=off if stat() failed] Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> (cherry picked from commit 8422d85) Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
thaJeztah
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ping @kolyshkin @dmcgowan PTAL |
thaJeztah
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LGTM |
seemethere
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Nov 21, 2018
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LGTM |
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backport of moby#37993 for 18.09
fixes moby#37970
cherry-pick was clean, no conflicts