Cephfs Quota Support

This patch implements cephfs quota support. Currently, the quota is implemented at directory level.

Some key designs behind,
1 Quota is get/set by extend attribute interfrace; 2 QuotaTree is used to buffer quota at client side, and it is lazily reconstructed if directory hierarchy changed;
3 Quota update is synchronized within mds cluster by PolicyLock;
4 New rstat as well as quota are pushed to all related clients by auth mds, prior to that, MGatherCaps message is used to collect information of clients from other mds; 5 Quota is pushed to client within the reply to readdir request;
6 Old mds without quota support is shut down;
7 Moving files across quota trees are forbidden if quota enabled.

Review at:
https://github.com/ceph/ceph/pull/1122
Pull at:
https://github.com/kylinstorage/ceph.git wip-cephfs-quota

---
Yunchuan Wen (25):
ceph: Add quota feature flags
ceph: Add quota_info_t to store quota info
mds: Add quota field to inode_t
mds: Shutdown old mds without quota support
mds: Handle quota update
ceph: Add MClientQuota message type
ceph: Add MGatherCaps message type
mds: Push quota info to client by MClientReply
mds: Export cap to auth mds when mds handle MGatherCaps
mds: Add broadcast_quota_to_client routine
mds: Push new rstat and quota info to client
client: Add class QuotaTree type
client: Add quota field to Inode
client: Get root's parents inode when mount -r used
client: Add quota config to config_opts.h
client: Add QuotaTree functions
client: Handle getxattr to show quota information
client: Handle listxattr to show quota and qstat attributes
client: Update qtree when fs tree changed
client: Handle MClientQuota to update quota information
client: Add helper for quota check
client: Enforce quota check when creating new file
client: Forbid moving files across quota trees
client: Enforce quota check when changing file size
client: Inform mds file size when approaching quota limit

 src/ceph_mds.cc             |    3 +-
 src/client/Client.cc        |  325 ++++++++++++++++++++++++++++++++++++++++---
 src/client/Client.h         |    9 ++
 src/client/Inode.cc         |    3 +
 src/client/Inode.h          |   79 +++++++++++
 src/common/config_opts.h    |    2 +
 src/include/ceph_features.h |    2 +
 src/include/ceph_fs.h       |    1 +
 src/mds/CInode.cc           |   10 ++
 src/mds/Capability.h        |    1 +
 src/mds/MDCache.cc          |   40 ++++++
 src/mds/MDCache.h           |    1 +
 src/mds/MDS.h               |    3 +
 src/mds/MDSMap.cc           |    1 +
 src/mds/MDSMap.h            |    1 +
 src/mds/Migrator.cc         |   24 ++++
 src/mds/Migrator.h          |    3 +
 src/mds/Server.cc           |   71 +++++++++-
 src/mds/Server.h            |    1 +
 src/mds/mdstypes.cc         |   16 ++-
 src/mds/mdstypes.h          |   31 +++++
 src/messages/MClientQuota.h |   50 +++++++
 src/messages/MClientReply.h |    6 +
 src/messages/MGatherCaps.h  |   32 +++++
 src/messages/Makefile.am    |    2 +
 src/msg/Message.cc          |    8 ++
 src/msg/Message.h           |    1 +
 27 files changed, 700 insertions(+), 26 deletions(-)
 create mode 100644 src/messages/MClientQuota.h
 create mode 100644 src/messages/MGatherCaps.h

1.7.9.5