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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! |
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