- race in dynlock_unlock() fixed: several threads may find refcount=0 and
  try to free lock member at the same time. thanks to Andreas!

  is called. the last one didn't drop lmv->connected to 0 and this prevent
  subsequent lmv_connect() to work properly

b=3869,1742

These are the remaining fixes from 1742 that are needed to allow a
client to reconnect during recover.  The request that triggered 3869
on the last run was actually a RESENT request that was sent before
recovery had finished, which this patch will fix.

2 some fix for regular file cow

- more debug info

b=1451

Don't allow client to reconnect if an RPC is already in progress for
that client. Added an extra counter for this, because the export
refcount is also held by locks and who knows what else.

- dynlocks use own slab: slab-use-after-free may be enabled for only dynlocks

- more debug checks and printks

b=3843
r=bzzz

Initialize req before passing it to down.

2)add snap cow for obdfilter
3)some fix in smfs_cow

- debug info for corrupted lock case

b=3844
Add debug LASSERT to ldlm_replay_locks()

- new inode flag EXT3_EXTRA_ISIZE to mark inodes having i_extra_isize
  initialized properly

- mds_copy_unlink_reply() shouldn't be called if md_unlink() returns an error

Use lmv by default for insanity.sh.

update replay-dual.sh and replay-ost-single.sh

- Fix insanity.sh, still using the insanity-local.sh config by default.
- More cleanups in replay-single.sh. We need to generalize failures a
bit more, so we can choose a different mds each time, if more than one
is available.

Don't reset oscc_gr after recovery.

Fix replay-single.sh and recovery-small.sh so they can run with the
default lmv config or "-f cfg/local.sh" config.

use assignment instead of memset to clear the conn_cnt.

  move primary cowed inode to cowed dir.
2)move MSG_CONNECT_INITIAL check before obd_uuid equal check, otherwise,
  it will bring some problems in cmobd_setup.
3)set imp_conn_cnt to 0 in ptlrpc_disconnect_import

2)some minor fix in smfs cache_hook.

robert's fixes:
 - add CONNECT_INITAL flag for the initial connect message from a client.  When
   server sees an old client reconnect with that flag, then it needs to set the
   handles as if it was a new client.

 - set the initial imp_conn_cnt from the server's conn_cnt. When client
   connects with INITIAL set, the server sends back the old conn_cnt+1.

 - timeout for inter-MDS requests is set to obd_timeout / 2

- mds_open() logs parent/name couple. this helps recovery debugging