> -----Original Message-----
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
> Sent: Tuesday, April 27, 2021 7:38 AM
> Subject: Re: [PATCH v3 1/3] fsdax: Factor helpers to simplify dax fault code
>
> On Thu, Apr 22, 2021 at 09:44:59PM +0800, Shiyang Ruan wrote:
> > The dax page fault code is too long and a bit difficult to read. And
> > it is hard to understand when we trying to add new features. Some of
> > the PTE/PMD codes have similar logic. So, factor them as helper
> > functions to simplify the code.
> >
> > Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
> > Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> > Reviewed-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
> > ---
> > fs/dax.c | 153
> > ++++++++++++++++++++++++++++++-------------------------
> > 1 file changed, 84 insertions(+), 69 deletions(-)
> >
> > diff --git a/fs/dax.c b/fs/dax.c
> > index b3d27fdc6775..f843fb8fbbf1 100644
> > --- a/fs/dax.c
> > +++ b/fs/dax.c
>
> [snip]
>
> > @@ -1355,19 +1379,8 @@ static vm_fault_t dax_iomap_pte_fault(struct
> vm_fault *vmf, pfn_t *pfnp,
> > entry = dax_insert_entry(&xas, mapping, vmf, entry, pfn,
> > 0, write && !sync);
> >
> > - /*
> > - * If we are doing synchronous page fault and inode needs fsync,
> > - * we can insert PTE into page tables only after that happens.
> > - * Skip insertion for now and return the pfn so that caller can
> > - * insert it after fsync is done.
> > - */
> > if (sync) {
> > - if (WARN_ON_ONCE(!pfnp)) {
> > - error = -EIO;
> > - goto error_finish_iomap;
> > - }
> > - *pfnp = pfn;
> > - ret = VM_FAULT_NEEDDSYNC | major;
> > + ret = dax_fault_synchronous_pfnp(pfnp, pfn);
>
> I commented on the previous version... So I'll ask here too.
>
> Why is it ok to drop 'major' here?
This dax_iomap_pte_fault () finally returns 'ret | major', so I think the major here is not dropped. The origin code seems OR the return value and major twice.
--
Thanks,
Ruan Shiyang.
>
> Ira
