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 79ffb4855af048462c8c44b3d0a7a493926989bc..f548b64be09242a77f7db6ac7cedd5f68ee397b7 100644 (file)
--- 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 5677eb78557d598fb8bddfc59a5856b28a77db0d..1b60941dc4c65c45e05450e3a162b341b33aeec3 100644 (file)
--- 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 4bac72579c1f01056bf23a2b7a64941806d6e412..072280b3dd138e7cecf555c914fbb99c0589d618 100644 (file)
--- 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 0a536dc05f3b559d6d04c1e819d65290f96f7c35..d46ba566d62faeffc2b95089c0e684699c9257e4 100644 (file)
--- 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 b905e9888b888eb4b72fd10bae06eb06950e760b..efd19c2da9c29bab20fddff11f7df9678a3b1d55 100644 (file)
--- 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 09e628dafd9d829eadd9abb68c6956d182a582f8..4c20c228184c321694f8b1e408f50afecc0b07ba 100644 (file)
--- 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 5fc291c6157e3121f57d0a30e8d52a5021e3253c..60316fbaf2957d1bbbee14c67072920170954170 100644 (file)
--- 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 1616f668a4cb043741520d724b2f3602da0e07be..4afb2d26b148a3a41ca55171dee89d75da64e4f4 100644 (file)
--- 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 e6e66d087b2696ae8671631978b2fffe3c80f49e..7fff744f0865b4f7a4ad4aa8965555ba22c6706e 100644 (file)
--- 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 4046a6c6f223b0b4a923404c52c582308843b887..7da6e9c3cb53eb7d28ab44f6d40dbcea63e2d486 100644 (file)
--- 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 b16f3cda97ff0a6c12fb9ef3d8830603f5e5dc39..e2c0057737e67473126f00af3d693ab790c612a9 100644 (file)
--- 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 c7e4163ede87f3370a235bdb929cf26e5cd487e8..e545cbfbe5b2f25cf800d7b556f385592a84fd93 100644 (file)
--- 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 d74e08029643d3e5eeb1f8a14d9a78c290549863..e8b5866ffa07f838c82778757fee69fc81bc097f 100644 (file)
--- 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 8d1e60214ef0a88af4ef88ee82db2b79f29382d4..440987c8ba9ef2dc27eee2092e244d6f4c32bb7b 100644 (file)
--- 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 f06d0589ddba5db7226a38a6e0de3ef2cdee48d9..56b8bb75c3fc3b8809bf310dde5df49139caeb35 100644 (file)
--- 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 6408989857e01e1a15add4dfa0b816ec7545ce3c..aba72f7a8ac4b45e8b05111cd15f42bb1b26e0cd 100644 (file)
--- 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 442d50a0e33e6a37daf2c315a2a424f43ddfcdaa..a08f1039909a76e6427cf9e64ddf16c30a1716c9 100644 (file)
--- 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 c06774658345effe930825df56caedb1c296e97e..509411dd3698959c0b8c387dcf0f487b5da12abe 100644 (file)
--- 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 eee7206c38d18e1a3d3b1697fd429763e3fe9f5b..55c03b9e90708e1230210c271779350ca3c72cc7 100644 (file)
--- 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 593af2fdcc2dafec8574caa59d970365aede5239..7302d96ae8bfd742fe9f360f70ccd5d1b5df085d 100644 (file)
--- 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 a46bf6de9ce455a97ef18275efe4906ac10e12ed..b34f2e228601684a7bd9f31d7d8081a8e7623b53 100644 (file)
--- 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 d8b670cbd909292a6da33e5b16d3c16467727cb3..8f1feca89fb08fda21d050e3fcc49e1bb4c88398 100644 (file)
--- 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 0111ad0466ed42146f652db0be879b7335ab28df..3e0af317fcc3eb5e9af88b8f03e00de2f0153747 100644 (file)
--- 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 b3bc3e7ae79db3c1542f8e8cf3ac549aa0deed62..098508a93c7b302fe8e6ab65ec7cd753d2515634 100644 (file)
--- 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 8121e75352ee9bddd4726ca685d6d3e855256bdd..4e00b38efbe0925f834999401e286682c630dd72 100644 (file)
--- 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 (file)
index 0000000..aa18c4b
--- /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 d796f49ce87a3771ad82c14b1ee9a419759b634e..5e39f7a8efedf40775a4c953b82059aceeb00868 100644 (file)
--- 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,

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ccaa9aecd5930a360d217de49ef347d705e5d777..60d2726a6b62043edea32d0417d0e5e71fe71775 100644 (file)
--- 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 d551475517bfd8867dca18ea23657216a0d2364a..64bb8a22110c23b7989256b02c7d4851b89aab3f 100644 (file)
--- 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>