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Returns the number of allocated clusters in a Qcow #70

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@gthvn1 gthvn1 commented Oct 29, 2024

This script returns the number of allocated clusters in a Qcow file.
We probably won't use it like this but more probably as a library for the next qcow2util implementation.
I opened it because it is easier to discuss on a PR and like that we keep a backup while waiting to see what we do with it...

Last commit: 9207abe
"fix(linstor): check if resource is tiebreaker (#62)"

Signed-off-by: Ronan Abhamon <[email protected]>
@gthvn1 gthvn1 marked this pull request as draft October 29, 2024 18:20
@gthvn1 gthvn1 self-assigned this Oct 29, 2024
@gthvn1 gthvn1 force-pushed the gtn-get-allocated-clusters branch 2 times, most recently from 8259021 to 303c6b0 Compare November 1, 2024 10:56
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gthvn1 commented Nov 1, 2024

I will probably put functions into a class and pass the filename during the init(). The init will update a header, L1 table and L2 table. So we won't pass the file and header every time and the Qcow file will be hold only during the init.

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Note: your PR is targeting a 8.2 maintenance branch.

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gthvn1 commented Nov 4, 2024

Note: your PR is targeting a 8.2 maintenance branch.

Ok noted 👍 . I took the default branch presented on the github page. But in fact it doesn't matter a lot because we will only took the class to add it to the future qcowutil.py file. So this PR probably won't be merged as is.

@gthvn1 gthvn1 force-pushed the gtn-get-allocated-clusters branch 8 times, most recently from 248cbc5 to 7254eea Compare November 12, 2024 08:48
@gthvn1 gthvn1 changed the base branch from 2.30.8-8.2 to 3.2.3-8.3 November 12, 2024 08:49
@gthvn1 gthvn1 force-pushed the gtn-get-allocated-clusters branch 3 times, most recently from 7b63087 to 6febcd4 Compare November 15, 2024 12:37
This script can returns:
- the number of allocated clusters in a Qcow file.
- the number of newly allocated clusters in a Qcow file
  compared to a reference one (like the backing file).
- it can erase all data and set clusters as unallocated
- it can set/unset/get the hidden property.
  - for now it creates the custom header if not found but it can easily
    be changed. It also moves the backing file name because when a
    snapshot is created the hidden custom header is ignored so we need
    to make space to crate it again.

NOTE: This script is a POC to validate that all helpers from vhd util
are also doable with qcow file. It will be used in another file.

Signed-off-by: Guillaume <[email protected]>
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3 participants