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SubjectRe: [PATCH v4 11/11] blksnap: Kconfig and Makefile
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On 6/13/23 01:43, Randy Dunlap wrote:
>> +config BLKSNAP
>> + tristate "Block Devices Snapshots Module (blksnap)"
>> + help
>> + Allow to create snapshots and track block changes for block devices.
>> + Designed for creating backups for simple block devices. Snapshots are
>> + temporary and are released then backup is completed. Change block
> when backup is completed.
>
> or is the order of operations as listed: release snapshots and then backup
> can be completed?
>
>> + tracking allows to create incremental or differential backups.

"when backup is completed." - it will be more correct.

Normal backup process:

Take snapshot Release snapshot
| Start backup Finish backup |
| | Copy data from snapshot images | |
------------------------------------------------------------------------->
t

In case of failure, for example, when the snapshot is overflowing:

The snapshot is corrupted
Take snapshot | Release snapshot
| Start backup | | Finish failed backup
| | Copy data from snapshot images | | |
------------------------------------------------------------------------->
t

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