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by Spivak
2735 days ago
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The right term is a 'loopback device' which allows you to use a file on an existing filesystem as a block device. Here's what the flow looks like: open(/path/to/myfile) -> ext4 driver -> block operations on /dev/loop0 -> open(/path/to/loop-file) -> block operations on the data region of the file -> btrfs driver -> block operations on /dev/sda |
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