Yu Watanabe
1d60b723a3
get_block_device_harder_fd() currently only traverses one level of device mapper stacking when looking for the underlying block device. This causes issues with nested DM setups like dm-crypt on top of dm-integrity, where we don't traverse enough to get the actual physical device. Fix this by iterating through all DM layers until we reach a device with no underlying device. And while we're at it also make cgroups use the same logic. Fixes: #40419
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