writeback: separate out include/linux/backing-dev-defs.h

With the planned cgroup writeback support, backing-dev related
declarations will be more widely used across block and cgroup;
unfortunately, including backing-dev.h from include/linux/blkdev.h
makes cyclic include dependency quite likely.

This patch separates out backing-dev-defs.h which only has the
essential definitions and updates blkdev.h to include it.  c files
which need access to more backing-dev details now include
backing-dev.h directly.  This takes backing-dev.h off the common
include dependency chain making it a lot easier to use it across block
and cgroup.

v2: fs/fat build failure fixed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 101 deletions

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index d796f49ce87a..5e39f7a8efed 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -8,104 +8,11 @@
 #ifndef _LINUX_BACKING_DEV_H
 #define _LINUX_BACKING_DEV_H
 
-#include <linux/percpu_counter.h>
-#include <linux/log2.h>
-#include <linux/flex_proportions.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
 #include <linux/sched.h>
-#include <linux/timer.h>
 #include <linux/writeback.h>
-#include <linux/atomic.h>
-#include <linux/sysctl.h>
-#include <linux/workqueue.h>
-
-struct page;
-struct device;
-struct dentry;
-
-/*
- * Bits in bdi_writeback.state
- */
-enum wb_state {
-	WB_async_congested,	/* The async (write) queue is getting full */
-	WB_sync_congested,	/* The sync queue is getting full */
-	WB_registered,		/* bdi_register() was done */
-	WB_writeback_running,	/* Writeback is in progress */
-};
-
-typedef int (congested_fn)(void *, int);
-
-enum wb_stat_item {
-	WB_RECLAIMABLE,
-	WB_WRITEBACK,
-	WB_DIRTIED,
-	WB_WRITTEN,
-	NR_WB_STAT_ITEMS
-};
-
-#define WB_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
-
-struct bdi_writeback {
-	struct backing_dev_info *bdi;	/* our parent bdi */
-
-	unsigned long state;		/* Always use atomic bitops on this */
-	unsigned long last_old_flush;	/* last old data flush */
-
-	struct list_head b_dirty;	/* dirty inodes */
-	struct list_head b_io;		/* parked for writeback */
-	struct list_head b_more_io;	/* parked for more writeback */
-	struct list_head b_dirty_time;	/* time stamps are dirty */
-	spinlock_t list_lock;		/* protects the b_* lists */
-
-	struct percpu_counter stat[NR_WB_STAT_ITEMS];
-
-	unsigned long bw_time_stamp;	/* last time write bw is updated */
-	unsigned long dirtied_stamp;
-	unsigned long written_stamp;	/* pages written at bw_time_stamp */
-	unsigned long write_bandwidth;	/* the estimated write bandwidth */
-	unsigned long avg_write_bandwidth; /* further smoothed write bw */
-
-	/*
-	 * The base dirty throttle rate, re-calculated on every 200ms.
-	 * All the bdi tasks' dirty rate will be curbed under it.
-	 * @dirty_ratelimit tracks the estimated @balanced_dirty_ratelimit
-	 * in small steps and is much more smooth/stable than the latter.
-	 */
-	unsigned long dirty_ratelimit;
-	unsigned long balanced_dirty_ratelimit;
-
-	struct fprop_local_percpu completions;
-	int dirty_exceeded;
-
-	spinlock_t work_lock;		/* protects work_list & dwork scheduling */
-	struct list_head work_list;
-	struct delayed_work dwork;	/* work item used for writeback */
-};
-
-struct backing_dev_info {
-	struct list_head bdi_list;
-	unsigned long ra_pages;	/* max readahead in PAGE_CACHE_SIZE units */
-	unsigned int capabilities; /* Device capabilities */
-	congested_fn *congested_fn; /* Function pointer if device is md/dm */
-	void *congested_data;	/* Pointer to aux data for congested func */
-
-	char *name;
-
-	unsigned int min_ratio;
-	unsigned int max_ratio, max_prop_frac;
-
-	struct bdi_writeback wb;  /* default writeback info for this bdi */
-
-	struct device *dev;
-
-	struct timer_list laptop_mode_wb_timer;
-
-#ifdef CONFIG_DEBUG_FS
-	struct dentry *debug_dir;
-	struct dentry *debug_stats;
-#endif
-};
+#include <linux/backing-dev-defs.h>
 
 struct backing_dev_info *inode_to_bdi(struct inode *inode);
 
@@ -265,13 +172,6 @@ static inline int bdi_rw_congested(struct backing_dev_info *bdi)
 				  (1 << WB_async_congested));
 }
 
-enum {
-	BLK_RW_ASYNC	= 0,
-	BLK_RW_SYNC	= 1,
-};
-
-void clear_bdi_congested(struct backing_dev_info *bdi, int sync);
-void set_bdi_congested(struct backing_dev_info *bdi, int sync);
 long congestion_wait(int sync, long timeout);
 long wait_iff_congested(struct zone *zone, int sync, long timeout);
 int pdflush_proc_obsolete(struct ctl_table *table, int write,