cluster/dht: Make sure gf_defrag_migrate_data is not optimized

Problem:
Whenever there syncop_xxx() is used inside a synctask and gcc
optimizes it when compiled with -O2 there is a problem where
'errno' would not work as expected.

Fix:
Until http://review.gluster.com/6475 is reviewed and merged
we are making sure the function is not going to be optimized.

Change-Id: I504c18c8a7789f0c776a56f0aa60db3618b21601
BUG: 1040356
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/6481
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>
features/changelog: more changelog fixes.

-> log additional records.
-> include FOP number for metadata.
-> prevent crash if inode is not found in a fop.

Change-Id: I9edd4b71819ebd68c6a2b4150ae279c471d129da
BUG: 1036536
Signed-off-by: Ajeet Jha <ajha@redhat.com>
Reviewed-on: http://review.gluster.org/6403
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Amar Tumballi <amarts@gmail.com>
Reviewed-by: Venky Shankar <vshankar@redhat.com>
gsyncd / geo-rep: geo-replication fixes

-> "threaded" hybrid crawl.
-> Enabling metatadata synchronization.
-> Handling EINVAL/ESTALE gracefully while syncing metadata.
-> Improvments to changelog crawl code.
-> Initial crawl changelog generation format.
-> No gsyncd restart when checkpoint updated.
-> Fix symlink handling in hybrid crawl.
-> Slave's xtime key is 'stime'.
-> tar+ssh as data synchronization.
-> Instead of 'raise', just log in warning level for xtime missing cases.
-> Fix for JSON object load failure
-> Get new config value after config value reset.
-> Skip already processed changelogs.
-> Saving status of each individual worker thread.
-> GFID fetch on slave for purges.
-> Add tar ssh keys and config options.
-> Fix nlink count when using backend.
-> Include "data" operation for hardlink.
-> Use changelog time prefix as slave's time.
-> Process changelogs in parallel.

Change-Id: I09fcbb2e2e418149a6d8435abd2ac6b2f015bb06
BUG: 1036539
Signed-off-by: Ajeet Jha <ajha@redhat.com>
Reviewed-on: http://review.gluster.org/6404
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>