fsnotify: implement a default maximum queue depth

[pandora-kernel.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 81972eb..dea3b62 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -48,6 +48,21 @@ inline struct block_device *I_BDEV(struct inode *inode)
 
 EXPORT_SYMBOL(I_BDEV);
 
+/*
+ * move the inode from it's current bdi to the a new bdi. if the inode is dirty
+ * we need to move it onto the dirty list of @dst so that the inode is always
+ * on the right list.
+ */
+static void bdev_inode_switch_bdi(struct inode *inode,
+                       struct backing_dev_info *dst)
+{
+       spin_lock(&inode_lock);
+       inode->i_data.backing_dev_info = dst;
+       if (inode->i_state & I_DIRTY)
+               list_move(&inode->i_wb_list, &dst->wb.b_dirty);
+       spin_unlock(&inode_lock);
+}
+
 static sector_t max_block(struct block_device *bdev)
 {
        sector_t retval = ~((sector_t)0);
@@ -1390,7 +1405,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                                bdi = blk_get_backing_dev_info(bdev);
                                if (bdi == NULL)
                                        bdi = &default_backing_dev_info;
-                               bdev->bd_inode->i_data.backing_dev_info = bdi;
+                               bdev_inode_switch_bdi(bdev->bd_inode, bdi);
                        }
                        if (bdev->bd_invalidated)
                                rescan_partitions(disk, bdev);
@@ -1405,8 +1420,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                        if (ret)
                                goto out_clear;
                        bdev->bd_contains = whole;
-                       bdev->bd_inode->i_data.backing_dev_info =
-                          whole->bd_inode->i_data.backing_dev_info;
+                       bdev_inode_switch_bdi(bdev->bd_inode,
+                               whole->bd_inode->i_data.backing_dev_info);
                        bdev->bd_part = disk_get_part(disk, partno);
                        if (!(disk->flags & GENHD_FL_UP) ||
                            !bdev->bd_part || !bdev->bd_part->nr_sects) {
@@ -1439,7 +1454,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
        disk_put_part(bdev->bd_part);
        bdev->bd_disk = NULL;
        bdev->bd_part = NULL;
-       bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
+       bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info);
        if (bdev != bdev->bd_contains)
                __blkdev_put(bdev->bd_contains, mode, 1);
        bdev->bd_contains = NULL;
@@ -1533,7 +1548,8 @@ static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part)
                disk_put_part(bdev->bd_part);
                bdev->bd_part = NULL;
                bdev->bd_disk = NULL;
-               bdev->bd_inode->i_data.backing_dev_info = &default_backing_dev_info;
+               bdev_inode_switch_bdi(bdev->bd_inode,
+                                       &default_backing_dev_info);
                if (bdev != bdev->bd_contains)
                        victim = bdev->bd_contains;
                bdev->bd_contains = NULL;