fs: btrfs: Crossport open_ctree_fs_info() from btrfs-progs
open_ctree_fs_info() is the main entry point to open btrfs.
This version is a simplfied version of __open_ctree_fd() of btrfs-progs,
the main differences are:
- Parameters on how to specify a block device
Instead of @fd and @path, U-Boot uses blk_desc and disk_partition_t.
- Remove open_ctree flags
There won't be multiple open ctree modes in U-Boot.
Otherwise functions structures are all kept the same.
With open_ctree_fs_info() implemented, also introduce the global
current_fs_info pointer to show the current opened btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 7dfdaf7..a52ff94 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -22,6 +22,7 @@
};
extern struct btrfs_info btrfs_info;
+extern struct btrfs_fs_info *current_fs_info;
/* dev.c */
extern struct blk_desc *btrfs_blk_desc;