On Tue, Aug 29, 2017 at 10:37:52AM -0400, Brian Foster wrote:
> Ordered buffers pass through the logging infrastructure without ever
> being written to the log. The way this works is that the ordered
> buffer status is transferred to the log vector at commit time via
> the ->iop_size() callback. In xlog_cil_insert_format_items(),
> ordered log vectors bypass ->iop_format() processing altogether.
>
> Therefore it is unnecessary for xfs_buf_item_format() to handle
> ordered buffers. Remove the unnecessary logic and assert that an
> ordered buffer never reaches this point.
>
> Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/xfs/xfs_buf_item.c | 12 ++----------
> fs/xfs/xfs_trace.h | 1 -
> 2 files changed, 2 insertions(+), 11 deletions(-)
>
> diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
> index ff076d1..ef2c137 100644
> --- a/fs/xfs/xfs_buf_item.c
> +++ b/fs/xfs/xfs_buf_item.c
> @@ -323,6 +323,8 @@ xfs_buf_item_format(
> ASSERT((bip->bli_flags & XFS_BLI_STALE) ||
> (xfs_blft_from_flags(&bip->__bli_format) > XFS_BLFT_UNKNOWN_BUF
> && xfs_blft_from_flags(&bip->__bli_format) < XFS_BLFT_MAX_BUF));
> + ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED) ||
> + (bip->bli_flags & XFS_BLI_STALE));
>
>
> /*
> @@ -347,16 +349,6 @@ xfs_buf_item_format(
> bip->bli_flags &= ~XFS_BLI_INODE_BUF;
> }
>
> - if ((bip->bli_flags & (XFS_BLI_ORDERED|XFS_BLI_STALE)) ==
> - XFS_BLI_ORDERED) {
> - /*
> - * The buffer has been logged just to order it. It is not being
> - * included in the transaction commit, so don't format it.
> - */
> - trace_xfs_buf_item_format_ordered(bip);
> - return;
> - }
> -
> for (i = 0; i < bip->bli_format_count; i++) {
> xfs_buf_item_format_segment(bip, lv, &vecp, offset,
> &bip->bli_formats[i]);
> diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
> index 6881047..e839ab4 100644
> --- a/fs/xfs/xfs_trace.h
> +++ b/fs/xfs/xfs_trace.h
> @@ -517,7 +517,6 @@ DEFINE_BUF_ITEM_EVENT(xfs_buf_item_size);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_size_ordered);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_size_stale);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_format);
> -DEFINE_BUF_ITEM_EVENT(xfs_buf_item_format_ordered);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_format_stale);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_ordered);
> DEFINE_BUF_ITEM_EVENT(xfs_buf_item_pin);
> --
> 2.9.5
>
> --
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