1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 6b455c2b3f03..23f029359688 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -607,7 +607,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
 
         while(count > 0) {
                 size_t offset = pos & (PAGE_CACHE_SIZE - 1);
-                size_t write_bytes = min(count, nrptrs * PAGE_CACHE_SIZE -
+                size_t write_bytes = min(count, nrptrs *
+                                        (size_t)PAGE_CACHE_SIZE -
                                          offset);
                 size_t num_pages = (write_bytes + PAGE_CACHE_SIZE - 1) >>
                                         PAGE_CACHE_SHIFT;