Btrfs: Add balance ioctl to restripe the chunks

[deliverable/linux.git] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1a74b5018699d5c5d181afe5e75e84e739ac6e82..994834474590c92e12988f7cbffe64a7ab05feca 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2864,6 +2864,15 @@ int btrfs_defrag_file(struct file *file) {
                                goto out_unlock;
                        }
                }
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+               ClearPageDirty(page);
+#else
+               cancel_dirty_page(page, PAGE_CACHE_SIZE);
+#endif
+               wait_on_page_writeback(page);
+               set_page_extent_mapped(page);
+
                page_start = (u64)page->index << PAGE_CACHE_SHIFT;
                page_end = page_start + PAGE_CACHE_SIZE - 1;
 
@@ -3105,6 +3114,8 @@ long btrfs_ioctl(struct file *file, unsigned int
                return btrfs_ioctl_resize(root, (void __user *)arg);
        case BTRFS_IOC_ADD_DEV:
                return btrfs_ioctl_add_dev(root, (void __user *)arg);
+       case BTRFS_IOC_BALANCE:
+               return btrfs_balance(root->fs_info->dev_root);
        }
 
        return -ENOTTY;