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zfs list: Allow more fields in ZFS_ITER_SIMPLE mode

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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
(0cee24064a) 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 <behlendorf1@llnl.gov>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Closes #14110
This commit is contained in:
Allan Jude
2022-12-13 20:27:54 -05:00
committed by GitHub
parent 70ac2654f5
commit dc95911d21
14 changed files with 205 additions and 108 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zfs_ioctl.c
+2 -3
View File
@@ -2039,7 +2039,7 @@ zfs_ioc_objset_stats_impl(zfs_cmd_t *zc, objset_t *os)
dmu_objset_fast_stat(os, &zc->zc_objset_stats);
if (zc->zc_nvlist_dst != 0 &&
if (!zc->zc_simple && zc->zc_nvlist_dst != 0 &&
(error = dsl_prop_get_all(os, &nv)) == 0) {
dmu_objset_stats(os, nv);
/*
@@ -2326,8 +2326,7 @@ zfs_ioc_snapshot_list_next(zfs_cmd_t *zc)
}
if (zc->zc_simple) {
zc->zc_objset_stats.dds_creation_txg =
dsl_get_creationtxg(ds);
dsl_dataset_fast_stat(ds, &zc->zc_objset_stats);
dsl_dataset_rele(ds, FTAG);
break;
}