From: "Darrick J. Wong" <djwong@kernel.org>
To: Gao Xiang <hsiangkao@redhat.com>
Cc: linux-xfs@vger.kernel.org, Brian Foster <bfoster@redhat.com>,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@lst.de>,
Eric Sandeen <sandeen@sandeen.net>
Subject: Re: [PATCH v7 5/5] xfs: add error injection for per-AG resv failure
Date: Wed, 3 Mar 2021 10:30:42 -0800 [thread overview]
Message-ID: <20210303183042.GD3419940@magnolia> (raw)
In-Reply-To: <20210302024816.2525095-6-hsiangkao@redhat.com>
On Tue, Mar 02, 2021 at 10:48:16AM +0800, Gao Xiang wrote:
> per-AG resv failure after fixing up freespace is hard to test in an
> effective way, so directly add an error injection path to observe
> such error handling path works as expected.
>
> Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
> ---
> fs/xfs/libxfs/xfs_ag_resv.c | 6 +++++-
> fs/xfs/libxfs/xfs_errortag.h | 4 +++-
> fs/xfs/xfs_error.c | 2 ++
> 3 files changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_ag_resv.c b/fs/xfs/libxfs/xfs_ag_resv.c
> index fdfe6dc0d307..6c5f8d10589c 100644
> --- a/fs/xfs/libxfs/xfs_ag_resv.c
> +++ b/fs/xfs/libxfs/xfs_ag_resv.c
> @@ -211,7 +211,11 @@ __xfs_ag_resv_init(
> ASSERT(0);
> return -EINVAL;
> }
> - error = xfs_mod_fdblocks(mp, -(int64_t)hidden_space, true);
> +
> + if (XFS_TEST_ERROR(false, mp, XFS_ERRTAG_AG_RESV_FAIL))
> + error = -ENOSPC;
> + else
> + error = xfs_mod_fdblocks(mp, -(int64_t)hidden_space, true);
> if (error) {
> trace_xfs_ag_resv_init_error(pag->pag_mount, pag->pag_agno,
> error, _RET_IP_);
> diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
> index 6ca9084b6934..b433ef735217 100644
> --- a/fs/xfs/libxfs/xfs_errortag.h
> +++ b/fs/xfs/libxfs/xfs_errortag.h
> @@ -40,6 +40,7 @@
> #define XFS_ERRTAG_REFCOUNT_FINISH_ONE 25
> #define XFS_ERRTAG_BMAP_FINISH_ONE 26
> #define XFS_ERRTAG_AG_RESV_CRITICAL 27
> +
Extra space?
> /*
> * DEBUG mode instrumentation to test and/or trigger delayed allocation
> * block killing in the event of failed writes. When enabled, all
> @@ -58,7 +59,8 @@
> #define XFS_ERRTAG_BUF_IOERROR 35
> #define XFS_ERRTAG_REDUCE_MAX_IEXTENTS 36
> #define XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT 37
> -#define XFS_ERRTAG_MAX 38
> +#define XFS_ERRTAG_AG_RESV_FAIL 38
> +#define XFS_ERRTAG_MAX 39
>
> /*
> * Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
This needs to define XFS_RANDOM_AG_RESV_FAIL and put it in
xfs_errortag_random_default in xfs_error.c to avoid running off the end
of the array.
Also... that _default array /really/ needs to have a BUILD_BUG_ON
somewhere to scream loudly if it isn't XFS_ERRTAG_MAX elements long.
--D
> diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
> index 185b4915b7bf..5192a7063d95 100644
> --- a/fs/xfs/xfs_error.c
> +++ b/fs/xfs/xfs_error.c
> @@ -168,6 +168,7 @@ XFS_ERRORTAG_ATTR_RW(iunlink_fallback, XFS_ERRTAG_IUNLINK_FALLBACK);
> XFS_ERRORTAG_ATTR_RW(buf_ioerror, XFS_ERRTAG_BUF_IOERROR);
> XFS_ERRORTAG_ATTR_RW(reduce_max_iextents, XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
> XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent, XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
> +XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
>
> static struct attribute *xfs_errortag_attrs[] = {
> XFS_ERRORTAG_ATTR_LIST(noerror),
> @@ -208,6 +209,7 @@ static struct attribute *xfs_errortag_attrs[] = {
> XFS_ERRORTAG_ATTR_LIST(buf_ioerror),
> XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
> XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
> + XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
> NULL,
> };
>
> --
> 2.27.0
>
next prev parent reply other threads:[~2021-03-04 0:18 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-02 2:48 [PATCH v7 0/5] xfs: support shrinking free space in the last AG Gao Xiang
2021-03-02 2:48 ` [PATCH v7 1/5] xfs: update lazy sb counters immediately for resizefs Gao Xiang
2021-03-03 18:13 ` Darrick J. Wong
2021-03-02 2:48 ` [PATCH v7 2/5] xfs: hoist out xfs_resizefs_init_new_ags() Gao Xiang
2021-03-02 2:48 ` [PATCH v7 3/5] xfs: introduce xfs_ag_shrink_space() Gao Xiang
2021-03-03 18:19 ` Darrick J. Wong
2021-03-03 23:16 ` Gao Xiang
2021-03-02 2:48 ` [PATCH v7 4/5] xfs: support shrinking unused space in the last AG Gao Xiang
2021-03-03 18:25 ` Darrick J. Wong
2021-03-03 23:19 ` Gao Xiang
2021-03-02 2:48 ` [PATCH v7 5/5] xfs: add error injection for per-AG resv failure Gao Xiang
2021-03-03 0:02 ` [PATCH v7.1 " Gao Xiang
2021-03-03 18:30 ` Darrick J. Wong [this message]
2021-03-03 23:11 ` [PATCH v7 " Gao Xiang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210303183042.GD3419940@magnolia \
--to=djwong@kernel.org \
--cc=bfoster@redhat.com \
--cc=david@fromorbit.com \
--cc=hch@lst.de \
--cc=hsiangkao@redhat.com \
--cc=linux-xfs@vger.kernel.org \
--cc=sandeen@sandeen.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.