In btrfs-progs 6.15 it is planned to add a new parameter in mkfs.btrfs --inode-flags, that can set attributes for subvolumes, directories, and files. The current supported attributes are "nodatacow", to disable CoW, and "nodatasum", to disable the checksum. This commit extend the "Subvolunes=" option to understand the "nodatacow" flag for subvolums only. If RepartOffline is enabled it will build the image without loopback devices, using the correct --inode-flags parameters. If RepartOffline is disabled it will use loopback devices and set the btrfs attributes accordingly. Signed-off-by: Alberto Planas <aplanas@suse.com>
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