[Gluster-devel] What does xdata mean? "gfid-req"?

[Zhitao Li]

Hello, everyone,


I am investigating  the difference between stat and lookup operations in GlusterFs now. In the translator named "md_cache", stat operation will hit the cache generally, while lookup operation will miss the cache.


The reason is that for lookup operation, md_cache will check whether the xdata is satisfied. In my case, lookup will include xdata "gfid-req" filled by fuse-bridge. However, in md_cache, this check never pass because the load flag of mdc_key "gfid-req"  is always 0.


Could anyone tell me why "gfid-req" is filled by fuse-bridge.c(fuse_getattr: nodeid==1->lookup)? What does it mean? And how xdata is used?

If no xdata, what would happen?

Thank you!


Best regards,
Zhitao Li

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