[Bugs] [Bug 1428066] New: debug/io-stats: Track path of operations in FOP samples

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428066

            Bug ID: 1428066
           Summary: debug/io-stats: Track path of operations in FOP
                    samples
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



debug/io-stats: Track path of operations in FOP samples

Summary:
- This diff adds the ability to track paths in our FOP samples.
- It adds a function called `attach_iosstat_to_inode()` which
  attaches a special struct containing the filename, to the inode.
- This diff attaches a struct, `ios_local` to each frame, and tracks
  paths, locs, fds, and inodes depending on the fop that it is
  executing.
- Operations done on this inode can then reference this path.

Signed-off-by: Shreyas Siravara <sshreyas at fb.com>

Change-Id: Ie43b2193f66d8c7f59b5d07293e07d6120e3b20a
Reviewed-on: http://review.gluster.org/16149
Tested-by: Shreyas Siravara <sshreyas at fb.com>
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
Smoke: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Kevin Vigor <kvigor at fb.com>
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>

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