LiangZheng should already have a fix for this.

  - more smart way to check if fs is mounted
  - in test 2g checking GNS with recursive path where last dir is not suid bit marked - should fail to mount it

  none of thread needs to wait for mount completion in kernel space.

- small cleanups in ll_gns_mount_object(). Some checks for input invariants are
  moved after checking gns state. Fixes in comments.

- added the ability to disable GNS at all via /proc/.../gns_enabled. This is useful
  for some complex tests (like recursive suid marked .mntinfo dir) at least. May be
  useful for something else.

- added two new sanity tests to sanity-gns.sh:

  a) test 2g: mounting /mnt/lustre/gns_entry/.mntinfo/.mntinfo/.mntinfo/.mntinfo where
     only last entry is correct GNS mount object.

  b) test 2h: upcall script starts mounting in background and retuns with no waiting
     for mount command.

- in sanity tests disable GNS when preparing mount objects and mount points.

 * remote uid/gid handling
 * various gss fixes
 * fix broken local ACL

  - fixed reading of mount object. Should be read not more than PAGE_SIZE - 1,
    reserving one byte for terminating zero.

  - fixed read data zero terminating. Not data[PAGE_SIZE - 1] should be zeroed
    out, but rather zero should be put at the end of actual read data.

  - added one more test which tests how GNS will mount dentry when there is
    number of concurent thread creating entries in the same directory. test_3a

  - fixes in other sanity tests. When a test creates number of concurrent threads
    for checking something, it should wait their termination before getting
    execution result and possibly fail. Do not remove upcalls from /tmp to have
    the ability to look at them after failure.

- cleanups in sanity-gns.sh
- added one more GNS test - mounting directory with absent mount object

- more fixes in GNS stuff:
  - fixes with refcount onto @dchild in ll_gns_mount_object() for error control paths
  - fixing using accessing @dchild in the case of IS_ERR(dchild)

  - disabled checking for GNS file in mds_open(), thus GNS mount points are also
    opening by now. This is needed, because in taking lock we can't reliable to detect
    GNS objects on MDS. Checking just suid bit and skip open such a dirs is not correct
    as one may create structure like dir/dir/dir and mark all of them by suid.

  - cleanups in sanity-gns.sh. Added few new tests for odd conditions like mount object
    is symlink, dir, etc. Added test for changing mount object name to "." and "..".
    Grouping tests into 2 groups:

    (1) general GNS tests - mounting/umounting on timeout with different conditions
    with possible deadlocks, races, etc.

    (2) checking for odd conditions like recursive suid bit marked mount points, etc

MDS_BACKFSTYPE and OST_BACKFSTYPE are defined for this.
FSTYPE is ldiskfs for 2.6 kernel by default

- small fix about check_type() function

- removed hardcoded checking for ".mntinfo" on MDS to see if we are trying to open GNS mount object. By now only suid bit on directory is checked. This should not break anything, as it is not used for any purpose.

- cleanups, moving not needed to be widely known llite functions to llite_internal.h

- added test_4a to sanity-gns.sh. It checks how GNS mounting works with 20 concurrent threads aiming to mount the same object.

- added more tests into sanity-gns.sh, splitting general test onto few smaller ones.

remove unused files.

- fixed sanity test 57a. It did not work with LMV setup due to unsupported features flag.

renamed to dt_exp and lmv_exp is renamed to md_exp. Related changes.

- removed OBD_MD_FID. And fid is now fetched on MDS on all constructive requests. It
is not fetched on unlink(), rename(), etc. This is because OBD_MD_FID flag lost
the sense as lmv layer needs it for all operations (to check if object is splitted).

- fixes and clanups in cmobd.sh and cobd.sh
- changes in lconf about module loading in OSD and MDSDEV.
- fixes in lconf about mount options forming.
- fixes in lmc about client ref managing.
- fixes in lconf about cmobd and cobd setup.

- changed mds_alloc_inode_sid() to allocate lustre_id in memory if there is
no passed one. This makes mds stuff do not use lustre_id allocated on stack
if there is only need to allocate inode sid without using it later. This
makes stack consumption smaller by 40 bytes in each such a case.

- in mds_setup() whrn comparing strings passed from userspace use strncmp()
- root lustre_id should be set up also in cases when there is no profile.
- making do not use lustre_id allocated on stack in places where it is possible.

- moving mds_finish_transno() calling to place where dput() for dchild is
already called to make sure, that unlink op got to current transaction.

- lots of changes in lconf. MDSDEV stuff is changed substantionaly. Removing
bugs prone code, replacing it by new one about setting up MDS, LMV, etc.
Added more verbose messages about MDS, LMV configuration. Removed redundant
stuff about forming mount options. It now is moved to function and be used from
few places.

- fixes in CMOBD and COBD objects about using LMV.

- fixed double client_ref adding to LMV, what led to double client config
writing on MDS setup.

- returned back sanity-cmobd.sh, whcih was lost after last merge.
- added sanity-fid.sh, which checks fid management correctness.

- fixes in llog_test.c and tests/run-llog.sh. By now sanity.sh test_60 passes.

 - add a flag in lustre_msg which indicate message type
 - add a security descriptor into most of messages send to MDSs, which
   include the uid, supplementary groups array etc.
 - add group hash
 - MDS retrive local groups database through upcall, and set/merge with
   which sent from client based on policies (here not totally finished)
 - move root_squash test into separate sanity-sec.sh

- lsmfs.sh changes to make it usable for testing smfs with no log maintaining.