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46 lines
1.2 KiB
ReStructuredText
46 lines
1.2 KiB
ReStructuredText
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========
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Refcount
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========
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Introduction
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============
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Dedupliation, as described in ../deduplication.rst, needs a way to
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maintain a target pool of deduplicated chunks with atomic ref
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refcounting. To that end, there exists an osd object class
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refcount responsible for using the object class machinery to
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maintain refcounts on deduped chunks and ultimately remove them
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as the refcount hits 0.
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Class Interface
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===============
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See cls/refcount/cls_refcount_client*
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* cls_refcount_get
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Atomically increments the refcount with specified tag ::
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void cls_refcount_get(librados::ObjectWriteOperation& op, const string& tag, bool implicit_ref = false);
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* cls_refcount_put
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Atomically decrements the refcount specified by passed tag ::
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void cls_refcount_put(librados::ObjectWriteOperation& op, const string& tag, bool implicit_ref = false);
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* cls_refcount_Set
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Atomically sets the set of refcounts with passed list of tags ::
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void cls_refcount_set(librados::ObjectWriteOperation& op, list<string>& refs);
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* cls_refcount_read
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Dumps the current set of ref tags for the object ::
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int cls_refcount_read(librados::IoCtx& io_ctx, string& oid, list<string> *refs, bool implicit_ref = false);
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