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perf(zfs): optimise pool listing for pools with many datasets (#440)

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Restricting the `zfs list` command to depth 1 saves a lot of time for
pools with many datasets/zvols.

In my case, before:
```
$ time zfs list -s name -o name,guid,available -H -p >/dev/null
real    0m3.853s
user    0m0.171s
sys     0m3.539s
```

After:
```
$ time zfs list -d 1 -s name -o name,guid,available -H -p >/dev/null
real    0m0.027s
user    0m0.002s
sys     0m0.026s
```

Signed-off-by: Joel Low <joel@joelsplace.sg>
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Joel Low 2023-05-29 11:47:28 +08:00 • committed by GitHub
parent 4b059dbfaa
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optimise pool listing for pools with many datasets