Re: [PATCH v24 11/11] xfs: Add helper function xfs_attr_leaf_addname

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On 8/30/21 7:17 AM, Chandan Babu R wrote:
On 25 Aug 2021 at 04:14, Allison Henderson wrote:
This patch adds a helper function xfs_attr_leaf_addname.  While this
does help to break down xfs_attr_set_iter, it does also hoist out some
of the state management.  This patch has been moved to the end of the
clean up series for further discussion.


Looks good to me.

Reviewed-by: Chandan Babu R <chandanrlinux@xxxxxxxxx>

Great, thankyou!

Allison


Suggested-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
  fs/xfs/libxfs/xfs_attr.c | 110 +++++++++++++++++++++------------------
  fs/xfs/xfs_trace.h       |   1 +
  2 files changed, 61 insertions(+), 50 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index c3fdf232cd51..7150f0e051a0 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -284,6 +284,65 @@ xfs_attr_sf_addname(
  	return -EAGAIN;
  }
+STATIC int
+xfs_attr_leaf_addname(
+	struct xfs_attr_item	*attr)
+{
+	struct xfs_da_args	*args = attr->xattri_da_args;
+	struct xfs_inode	*dp = args->dp;
+	int			error;
+
+	if (xfs_attr_is_leaf(dp)) {
+		error = xfs_attr_leaf_try_add(args, attr->xattri_leaf_bp);
+		if (error == -ENOSPC) {
+			error = xfs_attr3_leaf_to_node(args);
+			if (error)
+				return error;
+
+			/*
+			 * Finish any deferred work items and roll the
+			 * transaction once more.  The goal here is to call
+			 * node_addname with the inode and transaction in the
+			 * same state (inode locked and joined, transaction
+			 * clean) no matter how we got to this step.
+			 *
+			 * At this point, we are still in XFS_DAS_UNINIT, but
+			 * when we come back, we'll be a node, so we'll fall
+			 * down into the node handling code below
+			 */
+			trace_xfs_attr_set_iter_return(
+				attr->xattri_dela_state, args->dp);
+			return -EAGAIN;
+		}
+
+		if (error)
+			return error;
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
+	} else {
+		error = xfs_attr_node_addname_find_attr(attr);
+		if (error)
+			return error;
+
+		error = xfs_attr_node_addname(attr);
+		if (error)
+			return error;
+
+		/*
+		 * If addname was successful, and we dont need to alloc or
+		 * remove anymore blks, we're done.
+		 */
+		if (!args->rmtblkno &&
+		    !(args->op_flags & XFS_DA_OP_RENAME))
+			return 0;
+
+		attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
+	}
+
+	trace_xfs_attr_leaf_addname_return(attr->xattri_dela_state, args->dp);
+	return -EAGAIN;
+}
+
  /*
   * Set the attribute specified in @args.
   * This routine is meant to function as a delayed operation, and may return
@@ -319,57 +378,8 @@ xfs_attr_set_iter(
  			attr->xattri_leaf_bp = NULL;
  		}
- if (xfs_attr_is_leaf(dp)) {
-			error = xfs_attr_leaf_try_add(args,
-						      attr->xattri_leaf_bp);
-			if (error == -ENOSPC) {
-				error = xfs_attr3_leaf_to_node(args);
-				if (error)
-					return error;
-
-				/*
-				 * Finish any deferred work items and roll the
-				 * transaction once more.  The goal here is to
-				 * call node_addname with the inode and
-				 * transaction in the same state (inode locked
-				 * and joined, transaction clean) no matter how
-				 * we got to this step.
-				 *
-				 * At this point, we are still in
-				 * XFS_DAS_UNINIT, but when we come back, we'll
-				 * be a node, so we'll fall down into the node
-				 * handling code below
-				 */
-				trace_xfs_attr_set_iter_return(
-					attr->xattri_dela_state, args->dp);
-				return -EAGAIN;
-			} else if (error) {
-				return error;
-			}
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_LBLK;
-		} else {
-			error = xfs_attr_node_addname_find_attr(attr);
-			if (error)
-				return error;
+		return xfs_attr_leaf_addname(attr);
- error = xfs_attr_node_addname(attr);
-			if (error)
-				return error;
-
-			/*
-			 * If addname was successful, and we dont need to alloc
-			 * or remove anymore blks, we're done.
-			 */
-			if (!args->rmtblkno &&
-			    !(args->op_flags & XFS_DA_OP_RENAME))
-				return 0;
-
-			attr->xattri_dela_state = XFS_DAS_FOUND_NBLK;
-		}
-		trace_xfs_attr_set_iter_return(attr->xattri_dela_state,
-					       args->dp);
-		return -EAGAIN;
  	case XFS_DAS_FOUND_LBLK:
  		/*
  		 * If there was an out-of-line value, allocate the blocks we
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 1033a95fbf8e..77a78b5b1a29 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -4132,6 +4132,7 @@ DEFINE_EVENT(xfs_das_state_class, name, \
  	TP_ARGS(das, ip))
  DEFINE_DAS_STATE_EVENT(xfs_attr_sf_addname_return);
  DEFINE_DAS_STATE_EVENT(xfs_attr_set_iter_return);
+DEFINE_DAS_STATE_EVENT(xfs_attr_leaf_addname_return);
  DEFINE_DAS_STATE_EVENT(xfs_attr_node_addname_return);
  DEFINE_DAS_STATE_EVENT(xfs_attr_remove_iter_return);
  DEFINE_DAS_STATE_EVENT(xfs_attr_rmtval_remove_return);





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