[Cluster-devel] [GFS2 PATCH v4 0/3] Fix erroneous ETXTBSY problems with GFS2
Steven Whitehouse
swhiteho at redhat.com
Wed Nov 25 11:47:57 UTC 2015
Hi,
Looks good to me...
Acked-by: Steven Whitehouse <swhiteho at redhat.com>
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(-)
>
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