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Old 01-21-2008, 08:21 AM
Default Pre-pull patch posting


Here is the current GFS2 patch queue. You'll notice that this time
there are no DLM patches in this list. That is because the DLM team
are setting up their own git tree and this future DLM patches will
be sent directly by them rather than via the GFS2 tree.

Most of this set of patches is clean up and bug fixes, there is really
not a lot new this time. I guess the most significant thing is the
patch to use ->page_mkwrite which will greatly increase efficiency
when files opened r/w are mostly only accessed for reading across a

There are a number of cleanups related to journalling which is really
where the largest number of changes in terms of code lines is. The
indirect blocks for the journal are now scanned once only at mount
time and the bmap information is retained in the form of an extent
list. Since we expect journals to consist of only a single extent
in the normal case, this should generally be quite a short list :-)

In addition some of the tunables relating to the journal have been
removed in favour of autotuning those variables.

Old 04-17-2008, 08:37 AM
Default Pre-pull patch posting

This is the current content of the GFS2 -nmw git tree. Mostly bug
fixes, there are some changes relating to block mapping which are
working towards cleaning up this code and allowing more efficient
block mapping. There is a second part to that work which is not
included in this patch set - the plan is that it will be in the
next patch set and its currently undergoing testing.

There are a number of clean up patches in the series too. We have
been continuing the work of gradually reducing the fields in the
various ..._host structures with a view to eventually eliminating
them completely. They were introduced as a stop-gap measure to fix
the endianess annotation and the fields are now gradually being moved
to other structures (or eliminated).

Bob Peterson's new improved "bitfit" algorithm provides a nice
speed up when we are allocating blocks as well as cleaning up
that area of the code.

Old 07-11-2008, 10:11 AM
Default Pre-pull patch posting

So, although the merge window isn't yet open, I'm guessing that its
probably not too far away, hence this posting of the contents of
the current GFS2 -nmw git tree.

This time the big news is locking changes, although having said that,
there are far fewer queued patches in total than I've had for previous
merge windows and I believe that this is an indication of the
growing maturity of GFS2.

The first patch in the series is really the main change and is
a big clean up of the core of the glocks, which are really the
core of GFS2 in a lot of ways. Further through the series is
a documentation patch, which explains the fine detail of how
glocks work and the assumptions made by the glock core when
calling the functions relating to individual glock types.

Other notable changes include merging the lock_nolock module
into the core of GFS2 since there is little point in retaining
it separately. There is a plan to do the same to lock_dlm as
well in the future (not the DLM itself obviously, just the
interface module thats part of GFS2).

Most of the remaing changes are bug fixes or futher optimisations
over the initial glock changes, plus one or two minor clean ups
along the way.

Old 03-18-2009, 11:23 AM
Default Pre-pull patch posting


So as the merge window draws closer, here is the current content of the
GFS2 git tree. The major item this time is patch 5 in the series. This
contians by far the majority of the changes, and the majority of those
changes are actually removal of code. The patch merges the lock_dlm
module (not the dlm itself, but GFS2's interface to the dlm) into
GFS2 itself. This means that a number of optimisations are then
possible in terms of merging strucutures resulting in a considerable
saving in memory.

Since that patch is so large (I'm afraid that it really doesn't make
any sense to split it up) its been in the -nmw git tree for the whole
period since the last merge window and has also been posted for review
on cluster-devel on a number of occasions before that. We've run a
number of tests on it as well in that period, so I believe that its
pretty stable now. It certainly makes the code a lot cleaner and
easier to follow in that area.

The remainder of the patches are mostly bug fixes, but there are one
or two other interesting features, those being:

o GFS2 now supports the discard I/O requests for thin provisioning, etc
o A new "demote a glock" interface is added to sysfs to help in
testing GFS2
o With a new mkfs.gfs2 which writes UUIDs, the UUID is now included
in uevent messages (with older filesystems which don't have UUIDs,
we just don't send that information)

The GFS2 tracing patches which I posted a little while back are not
included in this patch set. I think I can see what I need to do in
order to avoid patching blktrace now, so my plan is to look at those
patches again after this merge window, and when all the queued patches
for the tracing subsystem have been merged.

As always, please let us know if you spot any issues in the patches,


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