Implement btrfs usage #1871
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Implement btrfs usage #1871
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Implements btrfs usage using a double walking diff and counting the result. Walking gives the most accurate count and includes inode usage. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
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LGTM |
Codecov Report
@@ Coverage Diff @@
## master #1871 +/- ##
==========================================
- Coverage 49.07% 48.87% -0.21%
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Files 86 86
Lines 8263 8332 +69
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+ Hits 4055 4072 +17
- Misses 3538 3586 +48
- Partials 670 674 +4
Continue to review full report at Codecov.
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LGTM |
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Doesnt it work for reflinked files? |
No, this is going to overshoot the total usage. This change provides the upper limit of usage for snapshot, rather than trying to minimize, which could change on btrfs depending on construction order. |
AkihiroSuda
approved these changes
Dec 5, 2017
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@AkihiroSuda Spoke with tonis and he is okay with this. |
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Implements btrfs usage using a double walking diff and counting the result. Walking gives the most accurate count and includes inode usage.
This is an alternative implementation to #1836 using our naive diff implementation instead of relying on btrfs quotas. The efficacy of btrfs quotas for filling in this usage has not been proven. There is still a use for quotas in implementing snapshot quotas in the future, but trusting the value is accurate and consistent on commit would require much more testing and research. The naive diff is slower but will always provide a consistent result.
Closes #1836