xfs: add tracing to xfs_swap_extents

To be able to diagnose whether the swap extents function is
detecting compatible inode data fork configurations for swapping
extents, add tracing points to the code to allow us to see the
format of the inode forks before and after the swap.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index c22a608321a3..3353aef50530 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -1414,6 +1414,59 @@ TRACE_EVENT(xfs_dir2_leafn_moveents,
                   __entry->count)
 );
 
+#define XFS_SWAPEXT_INODES \
+        { 0,    "target" }, \
+        { 1,    "temp" }
+
+#define XFS_INODE_FORMAT_STR \
+        { 0,    "invalid" }, \
+        { 1,    "local" }, \
+        { 2,    "extent" }, \
+        { 3,    "btree" }
+
+DECLARE_EVENT_CLASS(xfs_swap_extent_class,
+        TP_PROTO(struct xfs_inode *ip, int which),
+        TP_ARGS(ip, which),
+        TP_STRUCT__entry(
+                __field(dev_t, dev)
+                __field(int, which)
+                __field(xfs_ino_t, ino)
+                __field(int, format)
+                __field(int, nex)
+                __field(int, max_nex)
+                __field(int, broot_size)
+                __field(int, fork_off)
+        ),
+        TP_fast_assign(
+                __entry->dev = VFS_I(ip)->i_sb->s_dev;
+                __entry->which = which;
+                __entry->ino = ip->i_ino;
+                __entry->format = ip->i_d.di_format;
+                __entry->nex = ip->i_d.di_nextents;
+                __entry->max_nex = ip->i_df.if_ext_max;
+                __entry->broot_size = ip->i_df.if_broot_bytes;
+                __entry->fork_off = XFS_IFORK_BOFF(ip);
+        ),
+        TP_printk("dev %d:%d ino 0x%llx (%s), %s format, num_extents %d, "
+                  "Max in-fork extents %d, broot size %d, fork offset %d",
+                  MAJOR(__entry->dev), MINOR(__entry->dev),
+                  __entry->ino,
+                  __print_symbolic(__entry->which, XFS_SWAPEXT_INODES),
+                  __print_symbolic(__entry->format, XFS_INODE_FORMAT_STR),
+                  __entry->nex,
+                  __entry->max_nex,
+                  __entry->broot_size,
+                  __entry->fork_off)
+)
+
+#define DEFINE_SWAPEXT_EVENT(name) \
+DEFINE_EVENT(xfs_swap_extent_class, name, \
+        TP_PROTO(struct xfs_inode *ip, int which), \
+        TP_ARGS(ip, which))
+
+DEFINE_SWAPEXT_EVENT(xfs_swap_extent_before);
+DEFINE_SWAPEXT_EVENT(xfs_swap_extent_after);
+
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH