btrfs: switch BTRFS_FS_* to enums

bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr);

#define BTRFS_FS_BARRIER			1

#define BTRFS_FS_CLOSING_START			2

#define BTRFS_FS_CLOSING_DONE			3

#define BTRFS_FS_LOG_RECOVERING			4

#define BTRFS_FS_OPEN				5

#define BTRFS_FS_QUOTA_ENABLED			6

#define BTRFS_FS_UPDATE_UUID_TREE_GEN		9

#define BTRFS_FS_CREATING_FREE_SPACE_TREE	10

#define BTRFS_FS_BTREE_ERR			11

#define BTRFS_FS_LOG1_ERR			12

#define BTRFS_FS_LOG2_ERR			13

#define BTRFS_FS_QUOTA_OVERRIDE			14

enum {

	BTRFS_FS_BARRIER,

	BTRFS_FS_CLOSING_START,

	BTRFS_FS_CLOSING_DONE,

	BTRFS_FS_LOG_RECOVERING,

	BTRFS_FS_OPEN,

	BTRFS_FS_QUOTA_ENABLED,

	BTRFS_FS_UPDATE_UUID_TREE_GEN,

	BTRFS_FS_CREATING_FREE_SPACE_TREE,

	BTRFS_FS_BTREE_ERR,

	BTRFS_FS_LOG1_ERR,

	BTRFS_FS_LOG2_ERR,

	BTRFS_FS_QUOTA_OVERRIDE,

	/* Used to record internally whether fs has been frozen */

#define BTRFS_FS_FROZEN				15

	BTRFS_FS_FROZEN,

	/*

	 * Indicate that a whole-filesystem exclusive operation is running

	 * (device replace, resize, device add/delete, balance)

	 */

#define BTRFS_FS_EXCL_OP			16

	BTRFS_FS_EXCL_OP,

	/*

 * To info transaction_kthread we need an immediate commit so it doesn't

 * need to wait for commit_interval

	 * To info transaction_kthread we need an immediate commit so it

	 * doesn't need to wait for commit_interval

	 */

#define BTRFS_FS_NEED_ASYNC_COMMIT		17

	BTRFS_FS_NEED_ASYNC_COMMIT,

	/*

 * Indicate that balance has been set up from the ioctl and is in the main

 * phase. The fs_info::balance_ctl is initialized.

	 * Indicate that balance has been set up from the ioctl and is in the

	 * main phase. The fs_info::balance_ctl is initialized.

	 */

#define BTRFS_FS_BALANCE_RUNNING		18

	BTRFS_FS_BALANCE_RUNNING,

};

struct btrfs_fs_info {

	u8 chunk_tree_uuid[BTRFS_UUID_SIZE];