[Bugs] [Bug 1164506] New: md-cache checks for modification using whole seconds only

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1164506

            Bug ID: 1164506
           Summary: md-cache checks for modification using whole seconds
                    only
           Product: GlusterFS
           Version: mainline
         Component: core
          Keywords: Patch, Triaged
          Severity: medium
          Priority: medium
          Assignee: ndevos at redhat.com
          Reporter: ndevos at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com
            Blocks: 1158126



+++ This bug was initially created as a clone of Bug #1158126 +++

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.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1158126
[Bug 1158126] md-cache checks for modification using whole seconds only
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