xfs: uncached buffer tracing needs to print bno

Useless:

xfs_buf_get_uncached: dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_unlock:       dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_submit:       dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_hold:         dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_iowait:       dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_iodone:       dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_iowait_done:  dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_rele:         dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...

Useful:

xfs_buf_get_uncached: dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_unlock:       dev 253:32 bno 0xffffffffffffffff nblks 0x1 ...
xfs_buf_submit:       dev 253:32 bno 0x200b5 nblks 0x1 ...
xfs_buf_hold:         dev 253:32 bno 0x200b5 nblks 0x1 ...
xfs_buf_iowait:       dev 253:32 bno 0x200b5 nblks 0x1 ...
xfs_buf_iodone:       dev 253:32 bno 0x200b5 nblks 0x1 ...
xfs_buf_iowait_done:  dev 253:32 bno 0x200b5 nblks 0x1 ...
xfs_buf_rele:         dev 253:32 bno 0x200b5 nblks 0x1 ...

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 3043e5ed6495580de11de6932117addca0e85aec..8a6532aae779b49299e8c99b55b6d770d1866be1 100644 (file)
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -280,7 +280,10 @@ DECLARE_EVENT_CLASS(xfs_buf_class,
        ),
        TP_fast_assign(
                __entry->dev = bp->b_target->bt_dev;
-               __entry->bno = bp->b_bn;
+               if (bp->b_bn == XFS_BUF_DADDR_NULL)
+                       __entry->bno = bp->b_maps[0].bm_bn;
+               else
+                       __entry->bno = bp->b_bn;
                __entry->nblks = bp->b_length;
                __entry->hold = atomic_read(&bp->b_hold);
                __entry->pincount = atomic_read(&bp->b_pin_count);