Remove mlog(0) from fs/ocfs2/export.c and the masklog EXPORT.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/dcache.c and the masklog DCACHE.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/namei.c and the masklog NAMEI finally.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/quota_global.c and
the masklog QUOTA.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/reservations.c and the masklog RESERVATIONS.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/xattr.c and the masklog ML_XATTR.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/super.c and the masklog SUPER.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/extent_map.c and the masklog EXTENT_MAP.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Remove mlog(0) from fs/ocfs2/inode.c and the masklog INODE.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Change all the "mlog(0," in fs/ocfs2/mmap.c to trace events.
And finally remove masklog FILE_IO.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Change all the "mlog(0," in fs/ocfs2/refcounttree.c to trace events.
And finally remove masklog ML_REFCOUNT.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

Since all 4 files, localalloc.c, suballoc.c, alloc.c and
resize.c, which use DISK_ALLOC are changed to trace events,
Remove masklog DISK_ALLOC totally.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

mlog_exit is used to record the exit status of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

This patch just try to remove it or change it. So:
1. if all the error paths already use mlog_errno, it is just removed.
   Otherwise, it will be replaced by mlog_errno.
2. if it is used to print some return value, it is replaced with
   mlog(0,...).
mlog_exit_ptr is changed to mlog(0.
All those mlog(0,...) will be replaced with trace events later.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

ENTRY is used to record the entry of a function.
But because it is added in so many functions, if we enable it,
the system logs get filled up quickly and cause too much I/O.
So actually no one can open it for a production system or even
for a test.

So for mlog_entry_void, we just remove it.
for mlog_entry(...), we replace it with mlog(0,...), and they
will be replace by trace event later.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>

In the original code, we dereferenced "nst" before checking that it was
non-NULL.  I moved the check forward and pulled the code in an indent
level.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

When CONFIG_OCFS2_FS_STATS is not enabled:

fs/ocfs2/cluster/tcp.c:1254: error: implicit declaration of function 'o2net_update_recv_stats'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc:	Mark Fasheh <mfasheh@suse.com>
Cc:	Joel Becker <joel.becker@oracle.com>
Cc:	ocfs2-devel@oss.oracle.com
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

flush_scheduled_work() is deprecated and scheduled to be removed.

* cancel_delayed_work() + flush_schedule_work() ->
  cancel_delayed_work_sync().

* flush qs->qs_work directly on exit instead.
Signed-off-by: NTejun Heo <tj@kernel.org>
Acked-by: NJoel Becker <joel.becker@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>

Adds debugfs dentry o2net/stats to show the o2net timing statistics.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Tracks total time taken to process messages received on a socket.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Tracks total send and status times for all messages sent on a socket.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Replace time trackers in struct o2net_sock_container from struct timeval to
union ktime.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Replace time trackers in struct o2net_send_tracking from struct timeval to
union ktime.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Patch makes use of task_pid_nr(). Also removes the null check before calling
debugfs_remove().
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

The patch pins the node item of the local node when the o2hb thread
starts and unpins on stop.

An earlier patch pinned the node item of the remote node on o2net
connect and unpinned on disconnect.

Signed-off-by Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

This patch adds a per o2hb region debugfs file that shows whether that region
is pinned or not.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

This patch adds support for pinning o2hb regions in configfs. Pinning disallows
a region to be cleanly stopped as long as it has an active dependent user
(read o2dlm).

In local heartbeat mode, the region uuid matching the domain name is pinned as
long as the o2dlm domain is active.

In global heartbeat mode, all regions are pinned as long as there is atleast
one dependent user and the region count is 3 or less. All regions are unpinned
if the number of dependent users is zero or region count is greater than 3.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Patch removes a dropped region from the quorum region bitmap maintained by o2hb.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

o2net pins the node item of the remote node in configfs before initiating
the connection. It is unpinned on disconnect. This is to prevent the node
item from being unlinked while it is still in use.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Two masklogs had the same flag value.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Stanse found that o2hb_heartbeat_group_make_item leaks some memory on
fail paths. Fix the paths by adding a new label and jump there.
Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <joel.becker@oracle.com>
Cc: ocfs2-devel@oss.oracle.com
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: NJoel Becker <joel.becker@oracle.com>

Over time, block layer has accumulated a set of APIs dealing with bdev
open, close, claim and release.

* blkdev_get/put() are the primary open and close functions.

* bd_claim/release() deal with exclusive open.

* open/close_bdev_exclusive() are combination of open and claim and
  the other way around, respectively.

* bd_link/unlink_disk_holder() to create and remove holder/slave
  symlinks.

* open_by_devnum() wraps bdget() + blkdev_get().

The interface is a bit confusing and the decoupling of open and claim
makes it impossible to properly guarantee exclusive access as
in-kernel open + claim sequence can disturb the existing exclusive
open even before the block layer knows the current open if for another
exclusive access.  Reorganize the interface such that,

* blkdev_get() is extended to include exclusive access management.
  @holder argument is added and, if is @FMODE_EXCL specified, it will
  gain exclusive access atomically w.r.t. other exclusive accesses.

* blkdev_put() is similarly extended.  It now takes @mode argument and
  if @FMODE_EXCL is set, it releases an exclusive access.  Also, when
  the last exclusive claim is released, the holder/slave symlinks are
  removed automatically.

* bd_claim/release() and close_bdev_exclusive() are no longer
  necessary and either made static or removed.

* bd_link_disk_holder() remains the same but bd_unlink_disk_holder()
  is no longer necessary and removed.

* open_bdev_exclusive() becomes a simple wrapper around lookup_bdev()
  and blkdev_get().  It also has an unexpected extra bdev_read_only()
  test which probably should be moved into blkdev_get().

* open_by_devnum() is modified to take @holder argument and pass it to
  blkdev_get().

Most of bdev open/close operations are unified into blkdev_get/put()
and most exclusive accesses are tested atomically at the open time (as
it should).  This cleans up code and removes some, both valid and
invalid, but unnecessary all the same, corner cases.

open_bdev_exclusive() and open_by_devnum() can use further cleanup -
rename to blkdev_get_by_path() and blkdev_get_by_devt() and drop
special features.  Well, let's leave them for another day.

Most conversions are straight-forward.  drbd conversion is a bit more
involved as there was some reordering, but the logic should stay the
same.
Signed-off-by: NTejun Heo <tj@kernel.org>
Acked-by: NNeil Brown <neilb@suse.de>
Acked-by: NRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: NMike Snitzer <snitzer@redhat.com>
Acked-by: NPhilipp Reisner <philipp.reisner@linbit.com>
Cc: Peter Osterlund <petero2@telia.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <joel.becker@oracle.com>
Cc: Alex Elder <aelder@sgi.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: dm-devel@redhat.com
Cc: drbd-dev@lists.linbit.com
Cc: Leo Chen <leochen@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: Joern Engel <joern@logfs.org>
Cc: reiserfs-devel@vger.kernel.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>

ocfs2/cluster: Release debugfs file elapsed_time_in_ms

An earlier commit forgot to remove a debugfs file, elapsed_time_in_ms.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

dlm protocol 1.1. activates messages DLM_QUERY_REGION and DLM_QUERY_NODEINFO
that are a must for global heartbeat.

It also activates o2hb_global_heartbeat_active().
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Show per region heartbeat elapsed time

This patch adds a per region debugfs file that shows the elapsed time
since the time the o2hb timer was last armed.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Add mlogs for heartbeat up/down events

This patch adds mlogs for o2hb up and down events.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Create debugfs dir/files for each region

This patch creates debugfs directory for each o2hb region and creates
files to expose the region number and the per region live node bitmap.
This information will be useful in debugging cluster issues.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Create debugfs files for live, quorum and failed region bitmaps

This patch prints the bitmaps of live, quorum and failed regions. This
information will be useful in debugging cluster issues.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Maintain bitmap of failed regions

In global heartbeat mode, we track the bitmap of regions that have seen
heartbeat timeouts. We fence if the number of such regions is greater than
or equal to half the number of quorum regions.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Maintain bitmap of quorum regions

o2hb allows online adding of regions. However, a newly added region is not
used in quorum calculations unless it has been added on all nodes. This patch
tracks a bitmap of such quorum regions.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>

ocfs2/cluster: Track bitmap of live heartbeat regions

A heartbeat region becomes live (or active) after a fixed number of (steady)
iterations.
Signed-off-by: NSunil Mushran <sunil.mushran@oracle.com>