On Mon, Aug 21, 2017 at 07:39:49PM +0200, David Sterba wrote:
> > +/* roots: root tree, extent tree, chunk tree, dev tree, fs tree, csum tree 
> > */
> > +enum btrfs_mkfs_block {
> > +   SUPER_BLOCK = 0,
> > +   ROOT_TREE,
> > +   EXTENT_TREE,
> > +   CHUNK_TREE,
> > +   DEV_TREE,
> > +   FS_TREE,
> > +   CSUM_TREE,
> > +   BLOCK_COUNT

BLOCK_COUNT is 7

> > +};
> > +
> >  struct btrfs_mkfs_config {
> >     /* Label of the new filesystem */
> >     const char *label;
> > @@ -43,7 +55,7 @@ struct btrfs_mkfs_config {
> >     /* Output fields, set during creation */
> >  
> >     /* Logical addresses of superblock [0] and other tree roots */
> > -   u64 blocks[8];
> > +   u64 blocks[BLOCK_COUNT];

This replaces 8 with 7 then, so the fs_uuid gets overwritten, can be
also caught by simply running 'make test-mkfs'.

> >     char fs_uuid[BTRFS_UUID_UNPARSED_SIZE];
> >     char chunk_uuid[BTRFS_UUID_UNPARSED_SIZE];
> >  
> > -- 
> > 2.9.4
> > 
> > 
> > 
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