mm: bdi init hooks

provide BDI constructor/destructor hooks

[akpm@linux-foundation.org: compile fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 24 insertions, 1 deletions

diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 701ea77f62e9..80e1585b741e 100644
--- a/drivers/block/rd.c
+++ b/drivers/block/rd.c
@@ -411,6 +411,9 @@ static void __exit rd_cleanup(void)
                 blk_cleanup_queue(rd_queue[i]);
         }
         unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
+
+        bdi_destroy(&rd_file_backing_dev_info);
+        bdi_destroy(&rd_backing_dev_info);
 }
 
 /*
@@ -419,7 +422,19 @@ static void __exit rd_cleanup(void)
 static int __init rd_init(void)
 {
         int i;
-        int err = -ENOMEM;
+        int err;
+
+        err = bdi_init(&rd_backing_dev_info);
+        if (err)
+                goto out2;
+
+        err = bdi_init(&rd_file_backing_dev_info);
+        if (err) {
+                bdi_destroy(&rd_backing_dev_info);
+                goto out2;
+        }
+
+        err = -ENOMEM;
 
         if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 ||
                         (rd_blocksize & (rd_blocksize-1))) {
@@ -473,6 +488,9 @@ out:
                 put_disk(rd_disks[i]);
                 blk_cleanup_queue(rd_queue[i]);
         }
+        bdi_destroy(&rd_backing_dev_info);
+        bdi_destroy(&rd_file_backing_dev_info);
+out2:
         return err;
 }
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 64551ab6be03..0e937f64a789 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -893,6 +893,11 @@ static struct class *mem_class;
 static int __init chr_dev_init(void)
 {
         int i;
+        int err;
+
+        err = bdi_init(&zero_bdi);
+        if (err)
+                return err;
 
         if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
                 printk("unable to get major %d for memory devs\n", MEM_MAJOR);