Btrfs: Add readahead to the online shrinker, and a mount -o alloc_start= for testing

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3c7bf3bddcad..d6de46961887 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2058,7 +2058,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
 
         mutex_lock(&root->fs_info->fs_mutex);
         ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
-        mutex_lock(&root->fs_info->fs_mutex);
+        mutex_unlock(&root->fs_info->fs_mutex);
         if (ret)
                 goto out;