loop: remove loop.h

Merge loop.h into loop.c as all the content is only used there.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220419063303.583106-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/loop.c

@@ -59,7 +59,6 @@
 #include <linux/errno.h>
 #include <linux/major.h>
 #include <linux/wait.h>
-#include <linux/blkdev.h>
 #include <linux/blkpg.h>
 #include <linux/init.h>
 #include <linux/swap.h>
@@ -80,10 +79,62 @@
 #include <linux/blk-cgroup.h>
 #include <linux/sched/mm.h>
 #include <linux/statfs.h>
+#include <linux/uaccess.h>
+#include <linux/blk-mq.h>
+#include <linux/spinlock.h>
+#include <uapi/linux/loop.h>
+
+/* Possible states of device */
+enum {
+	Lo_unbound,
+	Lo_bound,
+	Lo_rundown,
+	Lo_deleting,
+};
 
-#include "loop.h"
+struct loop_func_table;
+
+struct loop_device {
+	int		lo_number;
+	loff_t		lo_offset;
+	loff_t		lo_sizelimit;
+	int		lo_flags;
+	char		lo_file_name[LO_NAME_SIZE];
+
+	struct file *	lo_backing_file;
+	struct block_device *lo_device;
+
+	gfp_t		old_gfp_mask;
+
+	spinlock_t		lo_lock;
+	int			lo_state;
+	spinlock_t              lo_work_lock;
+	struct workqueue_struct *workqueue;
+	struct work_struct      rootcg_work;
+	struct list_head        rootcg_cmd_list;
+	struct list_head        idle_worker_list;
+	struct rb_root          worker_tree;
+	struct timer_list       timer;
+	bool			use_dio;
+	bool			sysfs_inited;
+
+	struct request_queue	*lo_queue;
+	struct blk_mq_tag_set	tag_set;
+	struct gendisk		*lo_disk;
+	struct mutex		lo_mutex;
+	bool			idr_visible;
+};
 
-#include <linux/uaccess.h>
+struct loop_cmd {
+	struct list_head list_entry;
+	bool use_aio; /* use AIO interface to handle I/O */
+	atomic_t ref; /* only for aio */
+	long ret;
+	struct kiocb iocb;
+	struct bio_vec *bvec;
+	struct cgroup_subsys_state *blkcg_css;
+	struct cgroup_subsys_state *memcg_css;
+};
 
 #define LOOP_IDLE_WORKER_TIMEOUT (60 * HZ)
 #define LOOP_DEFAULT_HW_Q_DEPTH (128)