On Wed, Jan 10, 2018 at 01:50:03PM -0800, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Record the whichfork number of the fork being operated on in iext
> tracepoints. This makes it easier to trace our way through complex
> remapping operations like copy on write.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ---
> fs/xfs/xfs_trace.h | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
> index cd87985..1c38b79 100644
> --- a/fs/xfs/xfs_trace.h
> +++ b/fs/xfs/xfs_trace.h
> @@ -233,6 +233,7 @@ DECLARE_EVENT_CLASS(xfs_bmap_class,
> __field(xfs_exntst_t, state)
> __field(int, bmap_state)
> __field(unsigned long, caller_ip)
> + __field(int, whichfork)
> ),
> TP_fast_assign(
> struct xfs_ifork *ifp;
> @@ -250,11 +251,19 @@ DECLARE_EVENT_CLASS(xfs_bmap_class,
> __entry->state = r.br_state;
> __entry->bmap_state = state;
> __entry->caller_ip = caller_ip;
> - ),
> - TP_printk("dev %d:%d ino 0x%llx state %s cur 0x%p/%d "
> + if (ifp == XFS_IFORK_PTR(ip, XFS_DATA_FORK))
> + __entry->whichfork = XFS_DATA_FORK;
> + else if (ifp == XFS_IFORK_PTR(ip, XFS_ATTR_FORK))
> + __entry->whichfork = XFS_ATTR_FORK;
> + else if (ifp == XFS_IFORK_PTR(ip, XFS_COW_FORK))
> + __entry->whichfork = XFS_COW_FORK;
> + else
> + __entry->whichfork = -1;
> + ),
> + TP_printk("dev %d:%d ino 0x%llx fork %d state %s cur 0x%p/%d "
> "offset %lld block %lld count %lld flag %d caller %ps",
> MAJOR(__entry->dev), MINOR(__entry->dev),
> - __entry->ino,
> + __entry->ino, __entry->whichfork,
> __print_flags(__entry->bmap_state, "|", XFS_BMAP_EXT_FLAGS),
Doesn't ->bmap_state include this information? Looks like attr/cow
strings are included in the EXT_FLAGS list as well.
Brian
> __entry->leaf,
> __entry->pos,
> --
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