quota/marker: fix inode quota with rename

This is a backport of http://review.gluster.org/11578

There are three problems with marker-rename which
is fixed in this patch

Problem 1)
1) mq_reduce_parent_size is not handling inode-quota contribution
2) When dest files exists and IO is happening
   Now renaming will overwrite existing file
   mq_reduce_parent_size called on dest file
   with saved contribution, this can be
   a problem is IO is still happening
   contribution might have changed

Problem 2)
There is a small race between rename and in-progress write
Consider below scenario
1) rename FOP invoked on file 'x'
2) write is still in progress for file 'x'
3) rename takes a lock on old-parent
4) write-update txn blocked on old-parent to acquire lock
5) in rename_cbk, contri xattrs are removed and contribution is deleted and
   lock is released
6) now write-update txn gets the lock and updates the wrong parent
   as it was holding lock on old parent
   so validate parent once the lock is acquired

Problem 3)
when a rename operation is performed, a lock is
held on old parent. This lock is release before
unwinding the rename operation.
This can be a problem if there are in-progress
writes happening during rename, where update txn
can take a lock and update the old parent
as inode table is not updated with new parent

> Change-Id: Ic3316097c001c33533f98592e8fcf234b1ee2aa2
> BUG: 1240991
> Signed-off-by: vmallika <vmallika@redhat.com>
> Reviewed-on: http://review.gluster.org/11578
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Tested-by: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

Change-Id: Ie8e43c711a0e3dbe8494f0d64ab10c7b7a55e0d1
BUG: 1255244
Signed-off-by: vmallika <vmallika@redhat.com>
Reviewed-on: http://review.gluster.org/11961
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

0 files changed, 0 insertions, 0 deletions