How to reproduce: Make sure that the kernel is compiled with
CONFIG_TMPFS_XATTR not set. (Otherwise, as Miklos suggested, the bug
does not occur)
Start with a directory "lower" (btrfs in my case) containing an empty
file "x", and three empty directories "upper", "workdir", "over" on
"/tmp" (tmpfs). Then mount the overlayfs
sudo mount -t overlay -o \
lowerdir=lower,upperdir=/tmp/upper,workdir=/tmp/workdir overlay \
/tmp/over
Then the commands
sudo touch /tmp/over/x
sudo mv /tmp/over/x /tmp/over/z
fail:
touch: cannot touch '/tmp/over/x': Operation not supported
mv: cannot move '/tmp/over/x' to '/tmp/over/z': Operation not
supported
despite the permissions
-rw-r--r-- 1 ziegler ziegler 0 Mai 14 12:27 /tmp/over/y
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Bisection between 4.11.0 and 4.12-rc1 yielded
commit 3a1e819b4e80216e00ef6a4dfe67fa142450c5e1
Author: Amir Goldstein <amir73il@xxxxxxxxx>
Date: Thu Mar 30 15:22:16 2017 +0300
ovl: store file handle of lower inode on copy up
as responsible for this.
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Regards,
Martin
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