xfs: create attr log item opcodes and formats for parent pointers

Make the necessary alterations to the extended attribute log intent item
ondisk format so that we can log parent pointer operations.  This
requires the creation of new opcodes specific to parent pointers, and a
new four-argument replace operation to handle renames.  At this point
this part of the patchset has changed so much from what Allison original
wrote that I no longer think her SoB applies.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
index 8262c263be9d..78c87c405e33 100644
--- a/fs/xfs/libxfs/xfs_attr.c
+++ b/fs/xfs/libxfs/xfs_attr.c
@@ -440,6 +440,23 @@ xfs_attr_hashval(
 }
 
 /*
+ * PPTR_REPLACE operations require the caller to set the old and new names and
+ * values explicitly.  Update the canonical fields to the new name and value
+ * here now that the removal phase has finished.
+ */
+static void
+xfs_attr_update_pptr_replace_args(
+	struct xfs_da_args	*args)
+{
+	ASSERT(args->new_namelen > 0);
+	args->name = args->new_name;
+	args->namelen = args->new_namelen;
+	args->value = args->new_value;
+	args->valuelen = args->new_valuelen;
+	xfs_attr_sethash(args);
+}
+
+/*
  * Handle the state change on completion of a multi-state attr operation.
  *
  * If the XFS_DA_OP_REPLACE flag is set, this means the operation was the first
@@ -459,6 +476,8 @@ xfs_attr_complete_op(
 
 	if (!(args->op_flags & XFS_DA_OP_REPLACE))
 		replace_state = XFS_DAS_DONE;
+	else if (xfs_attr_intent_op(attr) == XFS_ATTRI_OP_FLAGS_PPTR_REPLACE)
+		xfs_attr_update_pptr_replace_args(args);
 
 	args->op_flags &= ~XFS_DA_OP_REPLACE;
 	args->attr_filter &= ~XFS_ATTR_INCOMPLETE;