remove ceph code

This patch removes initial ceph code, due to license issue.

Change-Id: I092d44f601cdf34aed92300fe13214925563081c
Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>

1 files changed, 0 insertions, 28 deletions

diff --git a/src/ceph/doc/dev/osd_internals/wbthrottle.rst b/src/ceph/doc/dev/osd_internals/wbthrottle.rst
deleted file mode 100644
index a3ae00d..0000000
--- a/src/ceph/doc/dev/osd_internals/wbthrottle.rst
+++ /dev/null
@@ -1,28 +0,0 @@
-==================
-Writeback Throttle
-==================
-
-Previously, the filestore had a problem when handling large numbers of
-small ios.  We throttle dirty data implicitely via the journal, but
-a large number of inodes can be dirtied without filling the journal
-resulting in a very long sync time when the sync finally does happen.
-The flusher was not an adequate solution to this problem since it
-forced writeback of small writes too eagerly killing performance.
-
-WBThrottle tracks unflushed io per hobject_t and ::fsyncs in lru
-order once the start_flusher threshold is exceeded for any of
-dirty bytes, dirty ios, or dirty inodes.  While any of these exceed
-the hard_limit, we block on throttle() in _do_op.
-
-See src/os/WBThrottle.h, src/osd/WBThrottle.cc
-
-To track the open FDs through the writeback process, there is now an
-fdcache to cache open fds.  lfn_open now returns a cached FDRef which
-implicitely closes the fd once all references have expired.
-
-Filestore syncs have a sideeffect of flushing all outstanding objects
-in the wbthrottle.
-
-lfn_unlink clears the cached FDRef and wbthrottle entries for the
-unlinked object when the last link is removed and asserts that all
-outstanding FDRefs for that object are dead.