1 files changed, 10 insertions, 5 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index feca8c648766..3229e217c773 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -133,16 +133,21 @@ static struct nfs_page *nfs_page_find_request(struct page *page)
 static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
 {
         struct inode *inode = page->mapping->host;
-        loff_t end, i_size = i_size_read(inode);
-        pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
+        loff_t end, i_size;
+        pgoff_t end_index;
 
+        spin_lock(&inode->i_lock);
+        i_size = i_size_read(inode);
+        end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
         if (i_size > 0 && page->index < end_index)
-                return;
+                goto out;
         end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
         if (i_size >= end)
-                return;
-        nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
+                goto out;
         i_size_write(inode, end);
+        nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
+out:
+        spin_unlock(&inode->i_lock);
 }
 
 /* A writeback failed: mark the page as bad, and invalidate the page cache */