ocfs2: Turn off shared writeable mmap for local files systems with holes.

This will be turned back on once we can do allocation in ->page_mkwrite().

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index 51b0204..af01158 100644 (file)
--- 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);