[Bugs] [Bug 1158126] New: md-cache checks for modification using whole seconds only

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1158126

            Bug ID: 1158126
           Summary: md-cache checks for modification using whole seconds
                    only
           Product: GlusterFS
           Version: 3.6.0
         Component: core
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: pspencer at fields.utoronto.ca
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Created attachment 951443
  --> https://bugzilla.redhat.com/attachment.cgi?id=951443&action=edit
Patch to make md-cache check subsecond timing values

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

When md-cache checks for an updated mtime/ctime in order to see if it should
request a cache invalidation, it only looks at the whole-second "mtime" and
"ctime" fields. If a file was modified a fraction of a second after the time of
the cached data, md-cache won't notice the change.

The attached patch makes md-cache look at the mtime_nsec and ctime_nsec fields
too.

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