On Tue, Jul 23, 2019 at 04:17:01PM -0400, Jan Harkes wrote: > commit 7fa0a1da3dadfd9216df7745a1331fdaa0940d1c upstream. > > Various file systems expect that vma->vm_file points at their own file > handle, several use file_inode(vma->vm_file) to get at their inode or > use vma->vm_file->private_data. However the way Coda wrapped mmap on a > host file broke this assumption, vm_file was still pointing at the Coda > file and the host file systems would scribble over Coda's inode and > private file data. > > This patch fixes the incorrect expectation and wraps vm_ops->open and > vm_ops->close to allow Coda to track when the vm_area_struct is > destroyed so we still release the reference on the Coda file handle at > the right time. > > This patch differs from the original upstream patch because older stable > kernels do not have the call_mmap vfs helper so we call f_ops->mmap > directly. > > Cc: stable@xxxxxxxxxxxxxxx # 4.9.x > Cc: stable@xxxxxxxxxxxxxxx # 4.4.x Now queued up, thanks! greg k-h
