Understanding dm Devices in Android: Linux Storage Stack Explained
The article explains how Android’s mount command shows numerous dm devices, detailing the Linux storage stack layers, using the OPPO Reno3 as a case study to illustrate the creation and purpose of dm devices, and poses why dm‑0 disappears from Android versions after Q.
When you run the mount command on your phone, you see many devices mounted as dm devices. What exactly are they and what principles are behind them? Taking OPPO Reno3 as an example:
First, please look at the Linux Storage Stack Diagram. The parts marked with red boxes are what we'll explain today...
Finally, let's explain the meaning of dm devices in the first diagram.
A thinking question:
dm devices are created starting from number 0, so why can't we see dm-0 in Android versions after Android Q?
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