On Tue, 22 Jun 2021 at 14:43, Christian König <christian.koenig@xxxxxxx> wrote: > > Am 22.06.21 um 14:30 schrieb Miklos Szeredi: > > Overlayfs did not honor positive i_writecount on realfile for VM_DENYWRITE > > mappings. Similarly negative i_mmap_writable counts were ignored for > > VM_SHARED mappings. > > > > Fix by making vma_set_file() switch the temporary counts obtained and > > released by mmap_region(). > > Mhm, I don't fully understand the background but that looks like > something specific to overlayfs to me. > > So why are you changing the common helper? Need to hold the temporary counts until the final ones are obtained in vma_link(), which is out of overlayfs' scope. Thanks, Miklos
