features/shard: Pass the correct iatt for cache invalidation

Backport of:
> Change-Id: Ib0349291d2d01f3782d6d0bdd90c6db5e0609210
> BUG: 1436739
> Reviewed on: https://review.gluster.org/16961
> (cherry picked from commit 5369fe2d545e0a0d31ab9c9d2797744c130af259)
          
This fixes a performance issue with shard which was causing
the translator to trigger unusually high number of lookups
for cache invalidation even when there was no modification to
the file.

In shard_common_stat_cbk(), it is local->prebuf that contains the
aggregated size and block count as opposed to buf which only holds the
attributes for the physical copy of base shard. Passing buf for
inode_ctx invalidation would always set refresh to true since the file
size in inode ctx contains the aggregated size and would never be same
as @buf->ia_size. This was leading to every write/read being preceded
by a lookup on the base shard even when the file underwent no
modification.

Change-Id: Ib0349291d2d01f3782d6d0bdd90c6db5e0609210
BUG: 1437326
Signed-off-by: Krutika Dhananjay <kdhananj@redhat.com>
Reviewed-on: https://review.gluster.org/16966
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>

0 files changed, 0 insertions, 0 deletions