[LSF/MM/BPF TOPIC] Improving Block Layer Tracepoints for Next-Generation Backup Systems

[Christoph Hellwig]

On Sat, Jan 04, 2025 at 11:22:40PM +0530, Vishnu ks wrote:
> 1. Uses eBPF to monitor block_rq_complete tracepoint to track modified sectors

You can't.  Drivers can and often do change the sector during submission
processing.

> 2. Captures sector numbers (not data) of changed blocks in real-time
> 3. Periodically syncs the actual data from these sectors based on
> configurable RPO
> 4. Layers these incremental changes on top of base snapshots

And all of that is broken.  If you are interested in this kind of
mechanism help upstreaming the blk-filter work, which has been
explicitly designed to support that.

Before that you should really undestand how block devices and
file systems work, as the rest of the mail suggested a very dangerous
misunderstanding of the basic principles.