linux.git/fs/dlm/debug_fs.c, branch v2.6.30

dlm: change rsbtbl rwlock to spinlock

2009-01-08T21:12:39+00:00

The rwlock is almost always used in write mode, so there's no reason
to not use a spinlock instead.

Signed-off-by: David Teigland

dlm: fix seq_file usage in debugfs lock dump

2009-01-08T21:12:31+00:00

The old code would leak iterators and leave reference counts on
rsbs because it was ignoring the "stop" seq callback.  The code
followed an example that used the seq operations differently.
This new code is based on actually understanding how the seq
operations work.  It also improves things by saving the hash bucket
in the position to avoid cycling through completed buckets in start.

Siged-off-by: Davd Teigland

dlm: add new debugfs entry

2008-12-23T16:18:51+00:00

The new debugfs entry dumps all rsb and lkb structures, and includes
a lot more information than has been available before.  This includes
the new timestamps added by a previous patch for debugging callback
issues.

Signed-off-by: David Teigland

dlm: change lock time stamping

2008-12-23T16:18:17+00:00

Use ktime instead of jiffies for timestamping lkb's.  Also stamp the
time on every lkb whenever it's added to a resource queue, instead of
just stamping locks subject to timeouts.  This will allow us to use
timestamps more widely for debugging all locks.

Signed-off-by: David Teigland

dlm: add init and exit marks to init and exit functions

2008-02-07T05:41:22+00:00

it moves 365 bytes from .text to .init.text, and 30 bytes from .text to
.exit.text, saves memory.

Signed-off-by: Denis Cheng 
Signed-off-by: David Teigland

dlm: eliminate astparam type casting

2008-02-07T05:27:04+00:00

Put lkb_astparam in a union with a dlm_user_args pointer to
eliminate a lot of type casting.

Signed-off-by: David Teigland

[DLM] dump more lock values

2007-07-09T07:24:13+00:00

Add two more output fields (lkb_flags and rsb nodeid) to the new debugfs
file that dumps one lock per line.  Also, dump all locks instead of just
mastered locks.  Accordingly, use a suffix of _locks instead of _master.

Signed-off-by: David Teigland 
Signed-off-by: Steven Whitehouse

[DLM] fix reference counting

2007-07-09T07:23:15+00:00

This is a fix for the patch

021d2ff3a08019260a1dc002793c92d6bf18afb6

I left off a dlm_hold_rsb which causes the box to panic if you try to use
debugfs.  This patch fixes the problem.  Sorry about that,

Signed-off-by: Josef Bacik 
Signed-off-by: Steven Whitehouse

[DLM] dumping master locks

2007-07-09T07:22:56+00:00

Add a new debugfs file that dumps a compact list of mastered locks.
This will be used by a userland daemon to collect state for deadlock
detection.

Also, for the existing function that prints all lock state, lock the rsb
before going through the lock lists since they can be changing in the
course of normal dlm activity.

Signed-off-by: David Teigland 
Signed-off-by: Steven Whitehouse

[DLM] keep dlm from panicing when traversing rsb list in debugfs

2007-07-09T07:22:29+00:00

This problem was originally reported against GFS6.1, but the same issue exists
in upstream DLM.  This patch keeps the rsb iterator assigning under the rsbtbl
list lock.  Each time we process an rsb we grab a reference to it to make sure
it is not freed out from underneath us, and then put it when we get the next rsb
in the list or move onto another list.

Signed-off-by: Josef Bacik 
Signed-off-by: Steven Whitehouse