[Bugs] [Bug 1158123] New: Quick-read translator does not invalidate its cache

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1158123

            Bug ID: 1158123
           Summary: Quick-read translator does not invalidate its cache
           Product: GlusterFS
           Version: 3.6.0
         Component: quick-read
          Severity: high
          Assignee: bugs at gluster.org
          Reporter: pspencer at fields.utoronto.ca
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Created attachment 951441
  --> https://bugzilla.redhat.com/attachment.cgi?id=951441&action=edit
Patch to make quick-read invalidate its cache when requested

This is one of the "other bugs" mentioned in bug #1158120.

When running the same example as in that bug report on a filesystem mounted
with o-direct, with that patch applied, then the output is sometimes correct

$ echo init > $D/f; cat $D/f; ssh $OTHER_HOST "echo second > $D/$f"; cat $D/f
init
second

but sometimes gives

$ echo init > $D/f; cat $D/f; ssh $OTHER_HOST "echo second > $D/$f"; cat $D/f
init
init
d

This is because the quick-read translator does not respond to cache
invalidation requests. The attached patch makes it listen to invalidation
requests and discard its cache.

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