Bug 1297213

+++ This bug was initially created as a clone of Bug #1296399 +++

Description of problem:
Stale stat information returned when an object is corrupted on a replicated volume.

Version-Release number of selected component (if applicable):
mainline

How reproducible:
always

Steps to Reproduce:
1. Create a replicated volume, enable bitrot, mount, perform I/O
2. Wait for files to get signed
3. Corrupt an object (modify form brick directly) from one of the replica (preferably first replica)
4. Wait till scrubber marks the object as corrupted
5. Perform I/O on the file again
6. stat to check object size

Actual results:
Stale (+ incorrect) stat information (size, mtime, etc..) reported

Expected results:
Correct stat information (updated size, mtim, etc..) should be returned

Additional info:

--- Additional comment from Vijay Bellur on 2016-01-07 02:22:37 EST ---

REVIEW: http://review.gluster.org/13120 (features/bitrot: add check for corrupted object in f{stat}) posted (#3) for review on master by Venky Shankar (vshankar)

--- Additional comment from Vijay Bellur on 2016-01-10 07:43:33 EST ---

COMMIT: http://review.gluster.org/13120 committed in master by Venky Shankar (vshankar) 
------
commit d5d6918ce7dc9f54496da435af546611dfbe7d5c
Author: Venky Shankar <vshankar>
Date:   Wed Dec 30 14:56:12 2015 +0530

    features/bitrot: add check for corrupted object in f{stat}
    
    Check for corrupted objects is done bt bitrot stub component
    for data operations and such fops are denied processing by
    returning EIO. These checks were not done for operations such
    as get/set extended attribute, stat and the likes - IOW, stub
    only blocked pure data operations.
    
    However, its necessary to have these checks for certain other
    fops, most importantly stat (and fstat). This is due to the
    fact that clients could possibly get stale stat information
    (such as size, {a,c,m}time) resulting in incorrect operation
    of the application that rely on these fields. Note that, the
    data that replication would take care of fetching good (and
    correct) data, but the staleness of stat information could
    lead to data inconsistencies (e.g., rebalance, tier).
    
    Change-Id: I5a22780373b182a13f8d2c4ca6b7d9aa0ffbfca3
    BUG: 1296399
    Signed-off-by: Venky Shankar <vshankar>
    Reviewed-on: http://review.gluster.org/13120
    Reviewed-by: Kotresh HR <khiremat>
    Reviewed-by: mohammed rafi  kc <rkavunga>
    Reviewed-by: Raghavendra Bhat <raghavendra>
    Tested-by: NetBSD Build System <jenkins.org>
    Tested-by: Gluster Build System <jenkins.com>