1 files changed, 5 insertions, 2 deletions

diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index 51b020447683..af01158b39f5 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -85,8 +85,11 @@ int ocfs2_mmap(struct file *file, struct vm_area_struct *vma)
         int ret = 0, lock_level = 0;
         struct ocfs2_super *osb = OCFS2_SB(file->f_dentry->d_inode->i_sb);
 
-        /* We don't want to support shared writable mappings yet. */
-        if (!ocfs2_mount_local(osb) &&
+        /*
+         * Only support shared writeable mmap for local mounts which
+         * don't know about holes.
+         */
+        if ((!ocfs2_mount_local(osb) || ocfs2_sparse_alloc(osb)) &&
             ((vma->vm_flags & VM_SHARED) || (vma->vm_flags & VM_MAYSHARE)) &&
             ((vma->vm_flags & VM_WRITE) || (vma->vm_flags & VM_MAYWRITE))) {
                 mlog(0, "disallow shared writable mmaps %lx\n", vma->vm_flags);