ipld/unixfs/io: MaxLinks and MaxHAMTFanout for directories #897
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(This is a supporting PR to being able to set dag-width in Kubo). |
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gammazero
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lidel
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Mar 28, 2025
WithMaxWidth() -------------- The new option sets effectively a maximum width to the directories. Currently, on a dynamic directory, the switching to-from Basic to HAMT is controlled by HAMTShardingSize, and the width of the HAMT shards by DefaultShardWidth. When WithMaxLinks() is specified, the switching is additionally controlled by the number of links exceeding the limit. In that case, MaxLinks is used as ShardWidth. The directory can only be converted back to BasicDirectory when the total number of links is below the limit. Backwards compatibility is kept and tests have been added. Note that when setting MaxLinks to a high number, it is possible that we still suffer automatic conversion to HAMT before hitting MaxLinks, if the estimated directory size is above 256KiB (as before). WithStat() ---------- Allows to set Stat on a new directory. WithCidBuilder() --------------- Allows to set the CidBuilder on a new directory.
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New review requested. Changes addressed.
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Let's continue on #906, as it has additionally touched the unixfs part a bit. |
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This PR paves the way to support controlling and limiting the max number of links a directory can have by supporting option-based limitations on the unixfs directory implementation.
The result is that we can set a maximum number of links in Dynamic folders that will trigger conversion to HAMT, which has in turn it's own Fanout option.
This PR has a follow up at #906 .