[RFCv1 08/72] libext2fs: Add bitmaps merge ops

["Ritesh Harjani (IBM)" <ritesh.list@gmail.com>]

From: Wang Shilong <wshilong@ddn.com>

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
[Note: splitted rb merge tree logic patch such that we
seperate out libext2fs changes from e2fsck specific changes]
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
 lib/ext2fs/bitmaps.c      | 10 ++++++++++
 lib/ext2fs/bmap64.h       |  4 ++++
 lib/ext2fs/ext2fs.h       |  8 ++++++++
 lib/ext2fs/gen_bitmap64.c | 29 +++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+)

diff --git a/lib/ext2fs/bitmaps.c b/lib/ext2fs/bitmaps.c
index 8bfa24b1..9437331e 100644
--- a/lib/ext2fs/bitmaps.c
+++ b/lib/ext2fs/bitmaps.c
@@ -45,6 +45,16 @@ errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
 {
 	return (ext2fs_copy_generic_bmap(src, dest));
 }
+
+errcode_t ext2fs_merge_bitmap(ext2fs_generic_bitmap src,
+			      ext2fs_generic_bitmap dest,
+			      ext2fs_generic_bitmap dup,
+			      ext2fs_generic_bitmap dup_allowed)
+{
+	return ext2fs_merge_generic_bmap(src, dest, dup,
+					 dup_allowed);
+}
+
 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
 {
 	ext2fs_set_generic_bmap_padding(map);
diff --git a/lib/ext2fs/bmap64.h b/lib/ext2fs/bmap64.h
index de334548..555193ee 100644
--- a/lib/ext2fs/bmap64.h
+++ b/lib/ext2fs/bmap64.h
@@ -72,6 +72,10 @@ struct ext2_bitmap_ops {
 	void	(*free_bmap)(ext2fs_generic_bitmap_64 bitmap);
 	errcode_t (*copy_bmap)(ext2fs_generic_bitmap_64 src,
 			     ext2fs_generic_bitmap_64 dest);
+	errcode_t (*merge_bmap)(ext2fs_generic_bitmap_64 src,
+				ext2fs_generic_bitmap_64 dest,
+				ext2fs_generic_bitmap_64 dup,
+				ext2fs_generic_bitmap_64 dup_allowed);
 	errcode_t (*resize_bmap)(ext2fs_generic_bitmap_64 bitmap,
 			       __u64 new_end,
 			       __u64 new_real_end);
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 443f93d2..54aed5d1 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -870,6 +870,10 @@ extern void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap);
 extern void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap);
 extern errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
 				    ext2fs_generic_bitmap *dest);
+extern errcode_t ext2fs_merge_bitmap(ext2fs_generic_bitmap src,
+			      ext2fs_generic_bitmap dest,
+			      ext2fs_generic_bitmap dup,
+			      ext2fs_generic_bitmap dup_allowed);
 extern errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
 					      const char *descr,
 					      ext2fs_block_bitmap *ret);
@@ -1467,6 +1471,10 @@ void ext2fs_set_generic_bmap_padding(ext2fs_generic_bitmap bmap);
 errcode_t ext2fs_resize_generic_bmap(ext2fs_generic_bitmap bmap,
 				     __u64 new_end,
 				     __u64 new_real_end);
+errcode_t ext2fs_merge_generic_bmap(ext2fs_generic_bitmap gen_src,
+                                    ext2fs_generic_bitmap gen_dest,
+				    ext2fs_generic_bitmap gen_dup,
+				    ext2fs_generic_bitmap dup_allowed);
 errcode_t ext2fs_compare_generic_bmap(errcode_t neq,
 				      ext2fs_generic_bitmap bm1,
 				      ext2fs_generic_bitmap bm2);
diff --git a/lib/ext2fs/gen_bitmap64.c b/lib/ext2fs/gen_bitmap64.c
index f7710afd..c31f942f 100644
--- a/lib/ext2fs/gen_bitmap64.c
+++ b/lib/ext2fs/gen_bitmap64.c
@@ -346,6 +346,35 @@ errcode_t ext2fs_copy_generic_bmap(ext2fs_generic_bitmap gen_src,
 	return 0;
 }
 
+errcode_t ext2fs_merge_generic_bmap(ext2fs_generic_bitmap gen_src,
+				    ext2fs_generic_bitmap gen_dest,
+				    ext2fs_generic_bitmap gen_dup,
+				    ext2fs_generic_bitmap gen_dup_allowed)
+{
+	ext2fs_generic_bitmap_64 src = (ext2fs_generic_bitmap_64)gen_src;
+	ext2fs_generic_bitmap_64 dest = (ext2fs_generic_bitmap_64)gen_dest;
+	ext2fs_generic_bitmap_64 dup = (ext2fs_generic_bitmap_64)gen_dup;
+	ext2fs_generic_bitmap_64 dup_allowed = (ext2fs_generic_bitmap_64)gen_dup_allowed;
+
+	if (!src || !dest)
+		return EINVAL;
+
+	if (!EXT2FS_IS_64_BITMAP(src) || !EXT2FS_IS_64_BITMAP(dest) ||
+	    (dup && !EXT2FS_IS_64_BITMAP(dup)) ||
+		(dup_allowed && !EXT2FS_IS_64_BITMAP(dup_allowed)))
+		return EINVAL;
+
+	if (src->bitmap_ops != dest->bitmap_ops ||
+	    (dup && src->bitmap_ops != dup->bitmap_ops) ||
+	    (dup_allowed && src->bitmap_ops != dup_allowed->bitmap_ops))
+		return EINVAL;
+
+	if (src->bitmap_ops->merge_bmap == NULL)
+		return EOPNOTSUPP;
+
+	return src->bitmap_ops->merge_bmap(src, dest, dup, dup_allowed);
+}
+
 errcode_t ext2fs_resize_generic_bmap(ext2fs_generic_bitmap gen_bmap,
 				     __u64 new_end,
 				     __u64 new_real_end)
-- 
2.37.3