readdir-ahead: Enhance EOD detection logic

Issue:
Currently end of directory is identified on obtaining a
readdirp_cbk with op_ret = 0 (i.e. 0 entries fetched in
readdirp). Thus an extra readdirp is required for every
directory just to identify EOD. Consider a case of listing
large number of small directories. The readdirp fops required
are doubled in that case.

Solution:
On reaching the EOD, posix sets the op_errno to ENOENT,
hence along with looking for 'op_ret == 0' we also
look for 'operrno == ENOENT' ehile checking for EOD condition

Change-Id: I7a5b52e7b98f5dc236c387635fcc651dac0171b3
BUG: 1401812
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: http://review.gluster.org/16042
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

0 files changed, 0 insertions, 0 deletions