[Cluster-devel] [GFS2 PATCH v4 0/3] Fix erroneous ETXTBSY problems with GFS2

[Steven Whitehouse <swhiteho@redhat.com>]

Hi,

ACK,

Steve.


On 24/11/15 19:36, Bob Peterson wrote:
> Hi,
>
> On 19 November, I posted an earlier "v3" version of this 3-patch set.
> Since then, I've uncovered more problems in testing and re-reviewing.
> This is a revised version of the three patches that fixes those problems.
>
> Regards,
>
> Bob peterson
> ---
> Commit 2b3dcf3 (GFS2: Increase i_writecount during gfs2_setattr_size)
> added a bunch of calls to get_write_access() in order to ensure file close
> could not delete an inode's multi-block reservation while the function
> was running. For example, close was interfering with setattr_size.
> The patch worked as expected, but there was an unintended consequence:
> If a GFS2 file is open, you can't do these functions (like chown) or
> you'll get ETXTBSY (Text file busy). For example, if you're running a
> program and try to do chown or chattr while it's running, it will fail.
>
> This problem is easily fixed by reverting that patch and including the
> multi-block reservation structure inside the gfs2 inode. The problem is,
> the gfs2 inode then grows to a much bigger size.
>
> This patch set takes some measures to reduce the size of the gfs2 inode
> and then making the reservations part of the inode.
>
> Before the patch set, GFS2 inodes were 864 bytes in length. Adding just
> the reservations structure bumped it up to 1280, which is not good.
> With all these patches in place, the size is 968, which is comparable
> to ext4 (1032) and xfs (1088). Further savings are possible (and I've
> prototyped a few) but I don't want to get too extreme here.
>
> Bob Peterson (3):
>    GFS2: Extract quota data from reservations structure (revert 5407e24)
>    GFS2: Make rgrp reservations part of the gfs2_inode structure
>    GFS2: Reduce size of incore inode
>
>   fs/gfs2/aops.c   |   2 +-
>   fs/gfs2/bmap.c   |  13 ++-----
>   fs/gfs2/file.c   |  25 +++++-------
>   fs/gfs2/glock.c  |  10 ++---
>   fs/gfs2/glock.h  |  26 ++++++-------
>   fs/gfs2/incore.h |  19 +++++----
>   fs/gfs2/inode.c  |  23 +++++------
>   fs/gfs2/main.c   |  16 ++++----
>   fs/gfs2/quota.c  | 115 ++++++++++++++++++++++++++++++++++++-------------------
>   fs/gfs2/quota.h  |   2 +
>   fs/gfs2/rgrp.c   |  59 +++++++++++-----------------
>   fs/gfs2/rgrp.h   |   6 +--
>   fs/gfs2/super.c  |   9 +++--
>   fs/gfs2/util.c   |   2 +-
>   fs/gfs2/util.h   |   2 +-
>   15 files changed, 171 insertions(+), 158 deletions(-)
>