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authorAllan Jude <[email protected]>2022-12-13 20:27:54 -0500
committerGitHub <[email protected]>2022-12-13 17:27:54 -0800
commitdc95911d21a19930848302aac9283fff68e4a41b (patch)
tree82f20fc9c52ce28b47987e8c7a089b37dbd100dd /include/sys
parent70ac2654f579e138d04ed747967fb0d603b0cacb (diff)
zfs list: Allow more fields in ZFS_ITER_SIMPLE mode
If the fields to be listed and sorted by are constrained to those populated by dsl_dataset_fast_stat(), then zfs list is much faster, as it does not need to open each objset and reads its properties. A previous optimization by Pawel Dawidek (0cee24064a79f9c01fc4521543c37acea538405f) took advantage of this to make listing snapshot names sorted only by name much faster. However, it was limited to `-o name -s name`, this work extends this optimization to work with: - name - guid - createtxg - numclones - inconsistent - redacted - origin and could be further extended to any other properties supported by dsl_dataset_fast_stat() or similar, that do not require extra locking or reading from disk. This was committed before (9a9e2e343dfa2af28bf7910de77ae73aa006de62), but was reverted due to a regression when used with an older kernel. If the kernel does not populate zc->zc_objset_stats, we now fallback to getting the properties via the slower interface, to avoid problems with newer userland and older kernels. Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Allan Jude <[email protected]> Closes #14110
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