missing up in mds_open_by_id
b:6068

LiangZheng should already have a fix for this.

debug mask, I'm not python export but simply remove them fixed it.
b=6104

b=6244

 - clean more files at clean time

 - add dependencies on built libs

by Nikita: fix group_info reference leak in pack_secdesc().

 - handle final completion calls only

 - add --disable-client and --disable-server configure options

  - 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.

- making lvfs_memdbg_show() show possible memory leaks warning even if
  memory allocation tracking is not enabled.

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

- added more checks in GNS stuff:

  - check for zero len mount object (mostly admin friendly thing, to show that
    mount object is formed not correctly)

  - set default GNS callback to "/usr/sbin/gns_upcall"

  - added checks in lproc stuff:
    - gns object name should be differnt than upcall
    - gns timeout should be bigger than gns tick

  - 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.

  - mounting only on lookup() control path (revalidate() for possible mounts always return 0).
    This makes it possible to use lookup_one_len() from ll_gns_mount_object(), as lookup
    control path protected parent.
  - on revalidate cause mount for possible mount points only if revalidate is successful
  - removed not used dentry marking with MOUNT_PENDING, etc

- 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

  - small optimization in ll_gns_wait_for_mount(), changing return code semantics to
    usual 0 - ok, < 0 error.

  - handled possible nested mount with returning -ERETSARTSYS and causing endless loop
    of mounting.

  - check if found mount object is regular file to prevent from evil cases like it is
    suid bit marked directory, etc.

  - fix with completting all waiters for dentry mounting in progress.
  - added check for "." and ".." names in setting gns_object_name.
  - fixed default gns_object_name value.

  - removed ll_d_lookup() as it is not used anymore.

  - removed struts from real_lookup() with calling revalidate() after lookup if dentry
    is marked GNS_MOUNTING. By now all this dentry marking is not needed anymore.

  - ll_gns_mount_object() is now called from ll_revalidate_it() and ll_lookup_it()

  - fixed deadlock when one thread T1 waits for mount completion and another one T2
    created by upcall script waits for dentry->d_inode->i_sem. By now -ERESTARTSYS
    is returned for T2 and others and whren they restart syscall, dentry is mounted
    already or some error occured and GNS state is READY for mount.

  - fixes in comments and header of llite_gns.c

  - fixed possible incorrect spin_unlock() in ll_gns_mount_object()

  - using lookup_one_len() for looking for mount object instead of d_lookup() which
    looks only in dcache.

  - fixed handling of negative mount object dentry in ll_gns_mount_object()

  - fixed readding mount object content. By now kernel_read() is used instead of
    readpage approach.

  - waking up all possible waiters on finishing GNS mount. Nevertheless in current
    stuff nobody seem waits for mount (-RESTARTSYS is used instead), completion
    exists and it is semanticaly correct to wake up all its waiters. In fact this
    is needed for possible future using. If it happen that nobody will wait on it
    and it is counted not needed, it will be removed.

be called in interrupt context.

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