Re: [PATCH misc-next] btrfs: fix compilation error in btree_write_cache_pages()

[Marcos Paulo de Souza <mpdesouza@suse.de>]

On Tue, 2020-02-25 at 05:22 +0900, Johannes Thumshirn wrote:
> CC [M]  fs/btrfs/extent_io.o
> fs/btrfs/extent_io.c: In function ‘btree_write_cache_pages’:
> fs/btrfs/extent_io.c:3959:34: error: ‘tree’ undeclared (first use in
> this function); did you mean ‘true’?
>  3959 |  struct btrfs_fs_info *fs_info = tree->fs_info;
>       |                                  ^~~~
>       |                                  true
> fs/btrfs/extent_io.c:3959:34: note: each undeclared identifier is
> reported only once for each function it appears in
> make[2]: *** [scripts/Makefile.build:268: fs/btrfs/extent_io.o] Error
> 1
> make[1]: *** [scripts/Makefile.build:505: fs/btrfs] Error 2
> make: *** [Makefile:1681: fs] Error 2
> 
> Fixes: 75c39607eb0a ("btrfs: Don't submit any btree write bio if the
> fs has errors")
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>

Indeed, it fixes the build of misc-next.
Reviewed-by: Marcos Paulo de Souza <mpdesouza@suse.com>

> ---
>  fs/btrfs/extent_io.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 903a85d8fbe3..837262d54e28 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -3956,7 +3956,7 @@ int btree_write_cache_pages(struct
> address_space *mapping,
>  		.extent_locked = 0,
>  		.sync_io = wbc->sync_mode == WB_SYNC_ALL,
>  	};
> -	struct btrfs_fs_info *fs_info = tree->fs_info;
> +	struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root-
> >fs_info;
>  	int ret = 0;
>  	int done = 0;
>  	int nr_to_write_done = 0;