[PATCH 1/3] Btrfs-progs: add missing write check for mkfs

[Filipe David Borba Manana <fdmanana@gmail.com>]

Assert that the write of the device tree root succeeds.
This verification is currently done for all other tree
roots, however it was missing for the device tree root.

Would this tree root write fail, but all others succeed,
it would lead to a corrupted/incomplete btrfs filesystem.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
---
 utils.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/utils.c b/utils.c
index 7b4cd74..43d93f1 100644
--- a/utils.c
+++ b/utils.c
@@ -381,6 +381,7 @@ int make_btrfs(int fd, const char *device, const char *label,
 	btrfs_set_header_nritems(buf, nritems);
 	csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
 	ret = pwrite(fd, buf->data, leafsize, blocks[4]);
+	BUG_ON(ret != leafsize);
 
 	/* create the FS root */
 	memset(buf->data+sizeof(struct btrfs_header), 0,
-- 
1.7.9.5