[PATCH v15 30/37] xfsprogs: Add state machine tracepoints

[Allison Henderson <allison.henderson@oracle.com>]

Source kernel commit: fbc8d6bb875915e0afd8ff6cd4364b368a6f894f

This is a quick patch to add a new tracepoint: xfs_das_state_return.  We
use this to track when ever a new state is set or -EAGAIN is returned

Signed-off-by: Allison Henderson <allison.henderson@oracle.com>
---
 include/xfs_trace.h      |  7 +++++++
 libxfs/xfs_attr.c        | 31 ++++++++++++++++++++++++++++++-
 libxfs/xfs_attr_remote.c |  1 +
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/include/xfs_trace.h b/include/xfs_trace.h
index a100263..cc3e8b3 100644
--- a/include/xfs_trace.h
+++ b/include/xfs_trace.h
@@ -314,4 +314,11 @@
 #define trace_xfs_perag_get_tag(a,b,c,d)	((c) = (c))
 #define trace_xfs_perag_put(a,b,c,d)		((c) = (c))
 
+#define trace_xfs_attr_set_fmt_return(a,b)	((void) 0)
+#define trace_xfs_attr_set_iter_return(a,b)	((void) 0)
+#define trace_xfs_attr_node_addname_return(a,b)	((void) 0)
+#define trace_xfs_attr_node_remove_rmt_return(a,b)	((void) 0)
+#define trace_xfs_attr_node_removename_iter_return(a,b)	((void) 0)
+#define trace_xfs_attr_rmtval_remove_return(a,b)	((void) 0)
+
 #endif /* __TRACE_H__ */
diff --git a/libxfs/xfs_attr.c b/libxfs/xfs_attr.c
index e4c6268..4aad38d 100644
--- a/libxfs/xfs_attr.c
+++ b/libxfs/xfs_attr.c
@@ -313,6 +313,7 @@ xfs_attr_set_fmt(
 	 * the attr fork to leaf format and will restart with the leaf
 	 * add.
 	 */
+	trace_xfs_attr_set_fmt_return(XFS_DAS_UNINIT, args->dp);
 	dac->flags |= XFS_DAC_DEFER_FINISH;
 	return -EAGAIN;
 }
@@ -378,6 +379,8 @@ xfs_attr_set_iter(
 				 * handling code below
 				 */
 				dac->flags |= XFS_DAC_DEFER_FINISH;
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 				return -EAGAIN;
 			}
 			else if (error)
@@ -400,10 +403,13 @@ xfs_attr_set_iter(
 				return error;
 
 			dac->dela_state = XFS_DAS_FOUND_NBLK;
+			trace_xfs_attr_set_iter_return(dac->dela_state,
+						       args->dp);
 			return -EAGAIN;
 		}
 
 		dac->dela_state = XFS_DAS_FOUND_LBLK;
+		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 
         case XFS_DAS_FOUND_LBLK:
@@ -433,6 +439,8 @@ xfs_attr_set_iter(
 			if (error)
 				return error;
 
+			trace_xfs_attr_set_iter_return(dac->dela_state,
+						       args->dp);
 			return -EAGAIN;
 		}
 
@@ -469,6 +477,7 @@ xfs_attr_set_iter(
 		 * series.
 		 */
 		dac->dela_state = XFS_DAS_FLIP_LFLAG;
+		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 	case XFS_DAS_FLIP_LFLAG:
 		/*
@@ -488,6 +497,9 @@ xfs_attr_set_iter(
 	case XFS_DAS_RM_LBLK:
 		if (args->rmtblkno) {
 			error = __xfs_attr_rmtval_remove(dac);
+			if (error == -EAGAIN)
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 			if (error)
 				return error;
 		}
@@ -545,6 +557,8 @@ xfs_attr_set_iter(
 				if (error)
 					return error;
 
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
 				return -EAGAIN;
 			}
 
@@ -581,6 +595,7 @@ xfs_attr_set_iter(
 		 * series
 		 */
 		dac->dela_state = XFS_DAS_FLIP_NFLAG;
+		trace_xfs_attr_set_iter_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 
 	case XFS_DAS_FLIP_NFLAG:
@@ -601,6 +616,10 @@ xfs_attr_set_iter(
 	case XFS_DAS_RM_NBLK:
 		if (args->rmtblkno) {
 			error = __xfs_attr_rmtval_remove(dac);
+			if (error == -EAGAIN)
+				trace_xfs_attr_set_iter_return(
+					dac->dela_state, args->dp);
+
 			if (error)
 				return error;
 		}
@@ -1227,6 +1246,8 @@ xfs_attr_node_addname(
 			 * this point.
 			 */
 			dac->flags |= XFS_DAC_DEFER_FINISH;
+			trace_xfs_attr_node_addname_return(
+					dac->dela_state, args->dp);
 			return -EAGAIN;
 		}
 
@@ -1407,6 +1428,9 @@ xfs_attr_node_remove_rmt (
 	 * May return -EAGAIN to request that the caller recall this function
 	 */
 	error = __xfs_attr_rmtval_remove(dac);
+	if (error == -EAGAIN)
+		trace_xfs_attr_node_remove_rmt_return(dac->dela_state,
+						      dac->da_args->dp);
 	if (error)
 		return error;
 
@@ -1526,6 +1550,8 @@ xfs_attr_node_removename_iter(
 
 			dac->flags |= XFS_DAC_DEFER_FINISH;
 			dac->dela_state = XFS_DAS_RM_SHRINK;
+			trace_xfs_attr_node_removename_iter_return(
+					dac->dela_state, args->dp);
 			return -EAGAIN;
 		}
 
@@ -1544,8 +1570,11 @@ xfs_attr_node_removename_iter(
 		goto out;
 	}
 
-	if (error == -EAGAIN)
+	if (error == -EAGAIN) {
+		trace_xfs_attr_node_removename_iter_return(
+					dac->dela_state, args->dp);
 		return error;
+	}
 out:
 	if (state)
 		xfs_da_state_free(state);
diff --git a/libxfs/xfs_attr_remote.c b/libxfs/xfs_attr_remote.c
index 628ab42..a1c9864e 100644
--- a/libxfs/xfs_attr_remote.c
+++ b/libxfs/xfs_attr_remote.c
@@ -762,6 +762,7 @@ __xfs_attr_rmtval_remove(
 	 */
 	if (!done) {
 		dac->flags |= XFS_DAC_DEFER_FINISH;
+		trace_xfs_attr_rmtval_remove_return(dac->dela_state, args->dp);
 		return -EAGAIN;
 	}
 
-- 
2.7.4