File 0011-btrfs-progs-Introduce-function-to-initialize-csum-tr.patch of Package btrfsprogs.5036

From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Fri, 29 Jan 2016 13:03:20 +0800
Subject: btrfs-progs: Introduce function to initialize csum tree
Git-commit: 1b8851ec40f7e135c1ff58d8225d4a724a99b757
Patch-mainline: v4.6
References: bsc#1042369

Introduce new function, setup_temp_csum_tree(), to setup temporary
csum tree for make_btrfs_v2().

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 utils.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/utils.c b/utils.c
index 36209df..1e12f57 100644
--- a/utils.c
+++ b/utils.c
@@ -675,6 +675,28 @@ out:
 	return ret;
 }
 
+static int setup_temp_csum_tree(int fd, struct btrfs_mkfs_config *cfg,
+				u64 csum_bytenr)
+{
+	struct extent_buffer *buf = NULL;
+	int ret;
+
+	buf = malloc(sizeof(*buf) + cfg->nodesize);
+	if (!buf)
+		return -ENOMEM;
+	ret = setup_temp_extent_buffer(buf, cfg, csum_bytenr,
+				       BTRFS_CSUM_TREE_OBJECTID);
+	if (ret < 0)
+		goto out;
+	/*
+	 * Temporary csum tree is completely empty.
+	 */
+	ret = write_temp_extent_buffer(fd, buf, csum_bytenr);
+out:
+	free(buf);
+	return ret;
+}
+
 /*
  * Improved version of make_btrfs().
  *
@@ -773,6 +795,9 @@ static int make_convert_btrfs(int fd, struct btrfs_mkfs_config *cfg,
 	if (ret < 0)
 		goto out;
 	ret = setup_temp_fs_tree(fd, cfg, fs_bytenr);
+	if (ret < 0)
+		goto out;
+	ret = setup_temp_csum_tree(fd, cfg, csum_bytenr);
 
 out:
 	return ret;
-- 
2.12.3