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Fast Dedup: ZAP Shrinking

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This allows ZAPs to shrink. When there are two empty sibling leafs,
one of them is collapsed and its storage space is reused.
This improved performance on directories that at one time contained
a large number of files, but many or all of those files have since
been deleted.

This also applies to all other types of ZAPs as well.

Sponsored-by: iXsystems, Inc.
Sponsored-by: Klara, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Alexander Stetsenko <alex.stetsenko@klarasystems.com>
Closes #15888
This commit is contained in:
Allan Jude
2024-04-24 17:51:21 -04:00
committed by GitHub
parent 67d13998b3
commit 5044c4e3ff
7 changed files with 488 additions and 12 deletions
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tests/runfiles/common.run
+4
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@@ -643,6 +643,10 @@ tags = ['functional', 'compression']
tests = ['cp_files_001_pos', 'cp_files_002_pos', 'cp_stress']
tags = ['functional', 'cp_files']
[tests/functional/zap_shrink]
tests = ['zap_shrink_001_pos']
tags = ['functional', 'zap_shrink']
[tests/functional/crtime]
tests = ['crtime_001_pos' ]
tags = ['functional', 'crtime']