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Re:My one-liner Linux Dropbox client by Spivak on Wednesday December 26, 2018 @05:24PM (#18765438)
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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