Change-Id: Ia84cc24c8924e6d22d02ac15f611c10e26db99b4
Signed-off-by: Nigel Babu <nigelb@redhat.com>

xlators/features/bit-rot/src/bitd/bit-rot-scrub-status.c
xlators/features/bit-rot/src/stub/bit-rot-stub-helpers.c
xlators/features/bit-rot/src/stub/bit-rot-stub.c
xlators/features/bit-rot/src/stub/bit-rot-stub.h

strncpy may not be very efficient for short strings copied into
a large buffer: If the length of src is less than n,
strncpy() writes additional null bytes to dest to ensure
that a total of n bytes are written.

Instead, use snprintf(). Ensure sprintf() results do not
truncate.

Also:
- save the result of strlen() and re-use it when possible.
- move from strlen to SLEN or sizeof() for const strings.
- move ret from int32 to int.

Compile-tested only!

Change-Id: Ib9b923c45d2d59ac15a105410e8160b252061018
updates: bz#1193929
Signed-off-by: Yaniv Kaul <ykaul@redhat.com>

1. br_update_scrub_finish_time:  BUFFER_SIZE_WARNING
2. br_read_bad_object_dir     :  DEADCODE
3. bit-rot.c: init            :  RESOURCE_LEAK
4. br_stub_fsetxattr          :  STACK_USE
5. br_stub_setxattr           :  STACK_USE
6. bit-rot-stub.c: init       :  BUFFER_SIZE_WARNING

Change-Id: Ie620f431bd7548fedae2152aa756ccdcd89ddf89
Signed-off-by: Kotresh HR <khiremat@redhat.com>
BUG: 789278

The patch does following changes.

 1. Introduce scrubber monitor thread.
 2. Move scrub status related APIs to separate file
    and make part of libbitrot library.

Problem:
     Earlier, each child of the scrubber was maintaining
the state machine and hence there was no way to track
the start and end time of scrubbing as each brick has
it's own start and end time. Also each brick was maintaining
it's own timer wheel instance. It was also not possible
to get scrubbed files count per session as we could not
get last child which finishes scrubbing to reset it to
zero.

Solution:
    Introduce scrubber monitor thread. It does following.

 1. Maintains the scrubber state machine. Earlier each
    child had it's own state machine. Now, only monitor
    maintains on behalf of all it's children.
 2. Maintains the timer wheel instance. Earlier each
    child had it's own timer wheel instance. Now, only
    monitor maintains on behalf of all it's children.

As a result, we can track the scrub statistics easily
and correctly.

Change-Id: Ic6e34ffa57984bd7a5ee81f4e263342bc1d9b302
BUG: 1329211
Signed-off-by: Kotresh HR <khiremat@redhat.com>
Reviewed-on: http://review.gluster.org/14044
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>