Details
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Improvement
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Resolution: Unresolved
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Minor
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None
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Lustre 2.12.0
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9223372036854775807
Description
Shrinking directories in ldiskfs would be desirable for cases where a directory had a large number of files created, but the files are deleted and the directory is empty and could be deallocated.
There is a patch submitted to upstream ext4 that is the start of the support for this functionality, but it is not very aggressive about removing directory blocks: https://patchwork.ozlabs.org/project/linux-ext4/list/?series=168937
There is intended to be additional work in this area to improve the directory shrinking functionality.
In addition to the directory shrinking, removal of old OST object directory trees (O/*/d*) is also useful, and could potentially be a substitute for having online directory shrink once the directories are completely empty.
