[PATCH 11/12] xfs_repair: update ondisk parent pointer records

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

Update the ondisk parent pointer records as necessary.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 libxfs/libxfs_api_defs.h |    2 +
 repair/pptr.c            |   88 ++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 87 insertions(+), 3 deletions(-)


diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index e12f0a40b00a..df316727bd62 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -209,8 +209,10 @@
 #define xfs_parent_hashval		libxfs_parent_hashval
 #define xfs_parent_lookup		libxfs_parent_lookup
 #define xfs_parent_removename		libxfs_parent_removename
+#define xfs_parent_set			libxfs_parent_set
 #define xfs_parent_start		libxfs_parent_start
 #define xfs_parent_from_attr		libxfs_parent_from_attr
+#define xfs_parent_unset		libxfs_parent_unset
 #define xfs_perag_get			libxfs_perag_get
 #define xfs_perag_hold			libxfs_perag_hold
 #define xfs_perag_put			libxfs_perag_put
diff --git a/repair/pptr.c b/repair/pptr.c
index 61466009d88b..94d6d834627c 100644
--- a/repair/pptr.c
+++ b/repair/pptr.c
@@ -673,6 +673,44 @@ load_file_pptr_name(
 			name, file_pptr->namelen);
 }
 
+/* Add an on disk parent pointer to a file. */
+static int
+add_file_pptr(
+	struct xfs_inode		*ip,
+	const struct ag_pptr		*ag_pptr,
+	const unsigned char		*name)
+{
+	struct xfs_name			xname = {
+		.name			= name,
+		.len			= ag_pptr->namelen,
+	};
+	struct xfs_parent_rec		pptr_rec = { };
+	struct xfs_da_args		scratch;
+
+	xfs_parent_rec_init(&pptr_rec, ag_pptr->parent_ino,
+			ag_pptr->parent_gen);
+	return -libxfs_parent_set(ip, ip->i_ino, &xname, &pptr_rec, &scratch);
+}
+
+/* Remove an on disk parent pointer from a file. */
+static int
+remove_file_pptr(
+	struct xfs_inode		*ip,
+	const struct file_pptr		*file_pptr,
+	const unsigned char		*name)
+{
+	struct xfs_name			xname = {
+		.name			= name,
+		.len			= file_pptr->namelen,
+	};
+	struct xfs_parent_rec		pptr_rec = { };
+	struct xfs_da_args		scratch;
+
+	xfs_parent_rec_init(&pptr_rec, file_pptr->parent_ino,
+			file_pptr->parent_gen);
+	return -libxfs_parent_unset(ip, ip->i_ino, &xname, &pptr_rec, &scratch);
+}
+
 /* Remove all pptrs from @ip. */
 static void
 clear_all_pptrs(
@@ -729,7 +767,16 @@ add_missing_parent_ptr(
 				name);
 	}
 
-	/* XXX actually do the work */
+	error = add_file_pptr(ip, ag_pptr, name);
+	if (error)
+		do_error(
+ _("adding ino %llu pptr (ino %llu gen 0x%x name '%.*s') failed: %s\n"),
+			(unsigned long long)ip->i_ino,
+			(unsigned long long)ag_pptr->parent_ino,
+			ag_pptr->parent_gen,
+			ag_pptr->namelen,
+			name,
+			strerror(error));
 }
 
 /* Remove @file_pptr from @ip. */
@@ -771,7 +818,16 @@ remove_incorrect_parent_ptr(
 			file_pptr->namelen,
 			name);
 
-	/* XXX actually do the work */
+	error = remove_file_pptr(ip, file_pptr, name);
+	if (error)
+		do_error(
+ _("removing ino %llu pptr (ino %llu gen 0x%x name '%.*s') failed: %s\n"),
+			(unsigned long long)ip->i_ino,
+			(unsigned long long)file_pptr->parent_ino,
+			file_pptr->parent_gen,
+			file_pptr->namelen,
+			name,
+			strerror(error));
 }
 
 /*
@@ -851,7 +907,33 @@ compare_parent_ptrs(
 			ag_pptr->namelen,
 			name1);
 
-	/* XXX do the work */
+	/* Remove the parent pointer that we don't want. */
+	error = remove_file_pptr(ip, file_pptr, name2);
+	if (error)
+		do_error(
+_("erasing ino %llu pptr (ino %llu gen 0x%x name '%.*s') failed: %s\n"),
+			(unsigned long long)ip->i_ino,
+			(unsigned long long)file_pptr->parent_ino,
+			file_pptr->parent_gen,
+			file_pptr->namelen,
+			name2,
+			strerror(error));
+
+	/*
+	 * Add the parent pointer that we do want.  It's possible that this
+	 * parent pointer already exists but we haven't gotten that far in the
+	 * scan, so we'll keep going on EEXIST.
+	 */
+	error = add_file_pptr(ip, ag_pptr, name1);
+	if (error && error != EEXIST)
+		do_error(
+ _("updating ino %llu pptr (ino %llu gen 0x%x name '%.*s') failed: %s\n"),
+			(unsigned long long)ip->i_ino,
+			(unsigned long long)ag_pptr->parent_ino,
+			ag_pptr->parent_gen,
+			ag_pptr->namelen,
+			name1,
+			strerror(error));
 }
 
 static int