[PATCH 5/8] xfs_repair: wipe ondisk parent pointers when there are none

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Erase all the parent pointers when there aren't any found by the
directory entry scan.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 repair/pptr.c |   29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)


diff --git a/repair/pptr.c b/repair/pptr.c
index 53ac1013..b1f5fb4e 100644
--- a/repair/pptr.c
+++ b/repair/pptr.c
@@ -567,8 +567,13 @@ remove_file_pptr(
 /* Remove all pptrs from @ip. */
 static void
 clear_all_pptrs(
-	struct xfs_inode	*ip)
+	struct xfs_inode	*ip,
+	struct file_scan	*fscan)
 {
+	struct xfs_slab_cursor	*cur;
+	struct file_pptr	*file_pptr;
+	int			error;
+
 	if (no_modify) {
 		do_warn(_("would delete unlinked ino %llu parent pointers\n"),
 				(unsigned long long)ip->i_ino);
@@ -577,7 +582,25 @@ clear_all_pptrs(
 
 	do_warn(_("deleting unlinked ino %llu parent pointers\n"),
 			(unsigned long long)ip->i_ino);
-	/* XXX actually do the work */
+
+	error = -init_slab_cursor(fscan->file_pptr_recs, NULL, &cur);
+	if (error)
+		do_error(_("init ino %llu pptr cursor failed: %s\n"),
+				(unsigned long long)ip->i_ino,
+				strerror(error));
+
+	while ((file_pptr = pop_slab_cursor(cur)) != NULL) {
+		error = remove_file_pptr(ip, file_pptr);
+		if (error)
+			do_error(
+ _("wiping ino %llu pptr (ino %llu gen 0x%x diroffset %u) failed: %s\n"),
+				(unsigned long long)ip->i_ino,
+				(unsigned long long)file_pptr->parent_ino,
+				file_pptr->parent_gen, file_pptr->diroffset,
+				strerror(error));
+	}
+
+	free_slab_cursor(&cur);
 }
 
 /* Add @ag_pptr to @ip. */
@@ -790,7 +813,7 @@ crosscheck_file_parent_ptrs(
 		 * file.
 		 */
 		if (fscan->nr_file_pptrs > 0)
-			clear_all_pptrs(ip);
+			clear_all_pptrs(ip, fscan);
 
 		return;
 	}