1 files changed, 44 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c
index 4f2dd2259e31..766347beeafc 100644
--- a/fs/xfs/libxfs/xfs_dir2.c
+++ b/fs/xfs/libxfs/xfs_dir2.c
@@ -19,6 +19,8 @@
 #include "xfs_error.h"
 #include "xfs_trace.h"
 #include "xfs_health.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_trans_space.h"
 
 struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR };
 
@@ -748,3 +750,45 @@ xfs_dir2_compname(
 		return xfs_ascii_ci_compname(args, name, len);
 	return xfs_da_compname(args, name, len);
 }
+
+/*
+ * Given a directory @dp, a newly allocated inode @ip, and a @name, link @ip
+ * into @dp under the given @name.  If @ip is a directory, it will be
+ * initialized.  Both inodes must have the ILOCK held and the transaction must
+ * have sufficient blocks reserved.
+ */
+int
+xfs_dir_create_new_child(
+	struct xfs_trans		*tp,
+	uint				resblks,
+	struct xfs_inode		*dp,
+	struct xfs_name			*name,
+	struct xfs_inode		*ip)
+{
+	struct xfs_mount		*mp = tp->t_mountp;
+	int				error;
+
+	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+	ASSERT(xfs_isilocked(dp, XFS_ILOCK_EXCL));
+	ASSERT(resblks == 0 || resblks > XFS_IALLOC_SPACE_RES(mp));
+
+	error = xfs_dir_createname(tp, dp, name, ip->i_ino,
+					resblks - XFS_IALLOC_SPACE_RES(mp));
+	if (error) {
+		ASSERT(error != -ENOSPC);
+		return error;
+	}
+
+	xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+	if (!S_ISDIR(VFS_I(ip)->i_mode))
+		return 0;
+
+	error = xfs_dir_init(tp, ip, dp);
+	if (error)
+		return error;
+
+	xfs_bumplink(tp, dp);
+	return 0;
+}