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Summary:
This translator tags namespaces with a unique hash that corresponds to the
top-level directory (right under the gluster root) of the file the fop acts
on. The hash information is injected into the call frame by this translator,
so this namespace information can later be used to do throttling, QoS and
other namespace-specific stats collection and actions in later xlators
further down the stack.
When the translator can't find a path directly for the fd_t or loc_t, it winds
a GET_ANCESTRY_PATH_KEY down to the posix xlator to get the path manually.
Caching this namespace information in the inode makes sure that most requests
don't need to recalculate the hash, so that typically fops are just doing an
inode_ctx_get instead of the more expensive code paths that this xlator can take.
Right now the xlator is hard-coded to only hash the top-level directory, but
this could be easily extended to more sophisticated matching by modification
of the parse_path function.
Test Plan:
Run `prove -v tests/basic/namespace.t` to see that tagging works.
Change-Id: I960ddadba114120ac449d27a769d409cc3759ebc
Reviewed-on: https://review.gluster.org/18041
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
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