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| author |   Li Zefan <lizf@cn.fujitsu.com> | 2011-12-01 14:06:42 +0800 |
|---|---|---|
| committer | Li Zefan <lizf@cn.fujitsu.com> | 2012-01-11 10:26:46 +0800 |
| commit | ec9ef7a13be4dcce964c8503e8999087945e5b9e (patch) | |
| tree | afd97976c76c45fca7b659f8d81cbcd4995d2a7e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | Btrfs: don't pre-allocate btrfs bio (diff) | |
| download | linux-dev-ec9ef7a13be4dcce964c8503e8999087945e5b9e.tar.xz linux-dev-ec9ef7a13be4dcce964c8503e8999087945e5b9e.zip | |
Btrfs: simplfy calculation of stripe length for discard operation
For btrfs raid, while discarding a range of space, we'll need to know
the start offset and length to discard for each device, and it's done
in btrfs_map_block().
However the calculation is a bit complex for raid0 and raid10, so I
reimplement it based on a fact that:
dev1 dev2 dev3 (raid0)
-----------------------------------
s0 s3 s6 s1 s4 s7 s2 s5
Each device has (total_stripes / nr_dev) stripes, or plus one.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
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