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>
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index 79ffb48..f548b64 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -21,6 +21,7 @@
*/
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/mempool.h>
#include <linux/bio.h>
#include <linux/scatterlist.h>
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 5677eb7..1b60941 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -6,6 +6,7 @@
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/blktrace_api.h>
#include <linux/blk-mq.h>
#include <linux/blk-cgroup.h>
diff --git a/block/bounce.c b/block/bounce.c
index 4bac725..072280b 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -13,6 +13,7 @@
#include <linux/pagemap.h>
#include <linux/mempool.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/hash.h>
#include <linux/highmem.h>
diff --git a/block/genhd.c b/block/genhd.c
index 0a536dc..d46ba56 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -8,6 +8,7 @@
#include <linux/kdev_t.h>
#include <linux/kernel.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/proc_fs.h>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index b905e98..efd19c2 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -38,6 +38,7 @@
#include <linux/mutex.h>
#include <linux/major.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/genhd.h>
#include <linux/idr.h>
#include <net/tcp.h>
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 09e628da..4c20c22 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -61,6 +61,7 @@
#include <linux/freezer.h>
#include <linux/mutex.h>
#include <linux/slab.h>
+#include <linux/backing-dev.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_ioctl.h>
#include <scsi/scsi.h>
diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 5fc291c6..60316fb 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -12,6 +12,7 @@
#include <linux/fs.h>
#include <linux/major.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/module.h>
#include <linux/raw.h>
#include <linux/capability.h>
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 1616f66..4afb2d2 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/hash.h>
#include <linux/random.h>
+#include <linux/backing-dev.h>
#include <trace/events/bcache.h>
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index e6e66d0..7fff744 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -14,6 +14,7 @@
#include <linux/device-mapper.h>
#include <linux/list.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/hdreg.h>
#include <linux/completion.h>
#include <linux/kobject.h>
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 4046a6c..7da6e9c 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -16,6 +16,7 @@
#define _MD_MD_H
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/mm.h>
diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index b16f3cd..e2c0057 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -20,6 +20,7 @@
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/pagemap.h>
#include <linux/list.h>
diff --git a/fs/block_dev.c b/fs/block_dev.c
index c7e4163..e545cbf 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -14,6 +14,7 @@
#include <linux/device_cgroup.h>
#include <linux/highmem.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/module.h>
#include <linux/blkpg.h>
#include <linux/magic.h>
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d74e0802..e8b5866 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -39,6 +39,7 @@
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <linux/fiemap.h>
+#include <linux/backing-dev.h>
#include "ext4_jbd2.h"
#include "ext4_extents.h"
#include "xattr.h"
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8d1e602..440987c 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -26,6 +26,7 @@
#include <linux/log2.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/backing-dev.h>
#include <trace/events/ext4.h>
#ifdef CONFIG_EXT4_DEBUG
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f06d058..56b8bb7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 6408989..aba72f7 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -9,6 +9,7 @@
* published by the Free Software Foundation.
*/
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
/* constant macro */
#define NULL_SEGNO ((unsigned int)(~0))
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 442d50a..a08f103 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -11,6 +11,7 @@
#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/fsnotify.h>
#include <linux/security.h>
#include "fat.h"
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index c067746..509411d 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -18,6 +18,7 @@
#include <linux/parser.h>
#include <linux/uio.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <asm/unaligned.h>
#include "fat.h"
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index eee7206..55c03b9 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/nls.h>
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 593af2f..7302d96 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -11,6 +11,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/vfs.h>
diff --git a/fs/nfs/filelayout/filelayout.c b/fs/nfs/filelayout/filelayout.c
index a46bf6d..b34f2e2 100644
--- a/fs/nfs/filelayout/filelayout.c
+++ b/fs/nfs/filelayout/filelayout.c
@@ -32,6 +32,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/module.h>
+#include <linux/backing-dev.h>
#include <linux/sunrpc/metrics.h>
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index d8b670c..8f1feca 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -37,6 +37,7 @@
#include <linux/falloc.h>
#include <linux/quotaops.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <cluster/masklog.h>
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 0111ad0..3e0af31 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -21,6 +21,7 @@
#include "xattr.h"
#include <linux/init.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/quotaops.h>
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index b3bc3e7..098508a 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -80,6 +80,7 @@
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 8121e753..4e00b38 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -41,6 +41,7 @@
#include <linux/dcache.h>
#include <linux/falloc.h>
#include <linux/pagevec.h>
+#include <linux/backing-dev.h>
static const struct vm_operations_struct xfs_file_vm_ops;
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
new file mode 100644
index 0000000..aa18c4bd
--- /dev/null
+++ b/include/linux/backing-dev-defs.h
@@ -0,0 +1,106 @@
+#ifndef __LINUX_BACKING_DEV_DEFS_H
+#define __LINUX_BACKING_DEV_DEFS_H
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/percpu_counter.h>
+#include <linux/flex_proportions.h>
+#include <linux/timer.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
+};
+
+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);
+
+#endif /* __LINUX_BACKING_DEV_DEFS_H */
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index d796f49..5e39f7a 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 @@
(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,
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ccaa9aec..60d2726 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -12,7 +12,7 @@
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/pagemap.h>
-#include <linux/backing-dev.h>
+#include <linux/backing-dev-defs.h>
#include <linux/wait.h>
#include <linux/mempool.h>
#include <linux/bio.h>
diff --git a/mm/madvise.c b/mm/madvise.c
index d551475..64bb8a2 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -17,6 +17,7 @@
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/blkdev.h>
+#include <linux/backing-dev.h>
#include <linux/swap.h>
#include <linux/swapops.h>
