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Add snapshots_changed as property

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Make dd_snap_cmtime property persistent across mount and unmount
operations by storing in ZAP and restore the value from ZAP on hold
into dd_snap_cmtime instead of updating it.

Expose dd_snap_cmtime as 'snapshots_changed' property that provides a
mechanism to quickly determine whether snapshot list for dataset has
changed without having to mount a dataset or iterate the snapshot list.

It specifies the time at which a snapshot for a dataset was last
created or deleted. This allows us to be more efficient how often we
query snapshots.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #13635
This commit is contained in:
Umer Saleem
2022-08-03 04:45:30 +05:00
committed by GitHub
parent 5ad44a0ce9
commit 9681de4657
14 changed files with 203 additions and 9 deletions
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module/zcommon/zfs_prop.c
+5
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@@ -734,6 +734,11 @@ zfs_prop_init(void)
NULL, PROP_READONLY, ZFS_TYPE_DATASET | ZFS_TYPE_BOOKMARK,
"<date>", "CREATION", B_FALSE, B_TRUE, B_TRUE, NULL, sfeatures);
zprop_register_impl(ZFS_PROP_SNAPSHOTS_CHANGED, "snapshots_changed",
PROP_TYPE_NUMBER, 0, NULL, PROP_READONLY, ZFS_TYPE_FILESYSTEM |
ZFS_TYPE_VOLUME, "<date>", "SNAPSHOTS_CHANGED", B_FALSE, B_TRUE,
B_TRUE, NULL, sfeatures);
zfs_mod_list_supported_free(sfeatures);
}