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Date: Wed, 23 Aug 2017 11:43:49 -0700 From: Christoph Hellwig <hch@...radead.org> To: Jan Kara <jack@...e.cz> Cc: linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org, Andy Lutomirski <luto@...nel.org>, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, Christoph Hellwig <hch@...radead.org>, Ross Zwisler <ross.zwisler@...ux.intel.com>, Dan Williams <dan.j.williams@...el.com>, Boaz Harrosh <boazh@...app.com> Subject: Re: [PATCH 10/13] mm: Wire up MAP_SYNC On Thu, Aug 17, 2017 at 06:08:12PM +0200, Jan Kara wrote: > Pretty crude for now... > > Signed-off-by: Jan Kara <jack@...e.cz> > --- > fs/ext4/file.c | 2 ++ > include/linux/mm.h | 1 + > include/linux/mman.h | 3 ++- > include/uapi/asm-generic/mman.h | 1 + > mm/mmap.c | 5 +++++ > 5 files changed, 11 insertions(+), 1 deletion(-) > > diff --git a/fs/ext4/file.c b/fs/ext4/file.c > index f84bb29e941e..850037e140d7 100644 > --- a/fs/ext4/file.c > +++ b/fs/ext4/file.c > @@ -340,6 +340,8 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) > vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; > } else { > vma->vm_ops = &ext4_file_vm_ops; > + if (vma->vm_flags & VM_SYNC) > + return -EOPNOTSUPP; > } So each mmap instance would need to reject the flag explicitly? Or do I misunderstand this VM_SYNC flag?
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