From: "ruansy.fnst@fujitsu.com" <ruansy.fnst@fujitsu.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-xfs@vger.kernel.org" <linux-xfs@vger.kernel.org>,
"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"darrick.wong@oracle.com" <darrick.wong@oracle.com>,
"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
"willy@infradead.org" <willy@infradead.org>,
"jack@suse.cz" <jack@suse.cz>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
"david@fromorbit.com" <david@fromorbit.com>,
"hch@lst.de" <hch@lst.de>, "rgoldwyn@suse.de" <rgoldwyn@suse.de>,
Ritesh Harjani <riteshh@linux.ibm.com>
Subject: RE: [PATCH v3 1/3] fsdax: Factor helpers to simplify dax fault code
Date: Tue, 27 Apr 2021 02:44:33 +0000 [thread overview]
Message-ID: <OSBPR01MB292025E6E88319A902C980FEF4419@OSBPR01MB2920.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20210426233823.GT1904484@iweiny-DESK2.sc.intel.com>
> -----Original Message-----
> From: Ira Weiny <ira.weiny@intel.com>
> 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@fujitsu.com>
> > Reviewed-by: Christoph Hellwig <hch@lst.de>
> > Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
> > ---
> > 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
next prev parent reply other threads:[~2021-04-27 2:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 13:44 [PATCH v3 0/3] fsdax: Factor helper functions to simplify the code Shiyang Ruan
2021-04-22 13:44 ` [PATCH v3 1/3] fsdax: Factor helpers to simplify dax fault code Shiyang Ruan
2021-04-26 23:38 ` Ira Weiny
2021-04-27 2:44 ` ruansy.fnst [this message]
2021-04-27 16:34 ` Ira Weiny
2021-05-25 22:26 ` Darrick J. Wong
2021-04-22 13:45 ` [PATCH v3 2/3] fsdax: Factor helper: dax_fault_actor() Shiyang Ruan
2021-05-25 23:11 ` Darrick J. Wong
2021-04-22 13:45 ` [PATCH v3 3/3] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-05-25 23:12 ` Darrick J. Wong
2021-05-08 5:26 ` [PATCH v3 0/3] fsdax: Factor helper functions to simplify the code ruansy.fnst
2021-05-14 10:23 ` ruansy.fnst
2021-06-03 22:37 ` Darrick J. Wong
2021-06-04 4:06 ` ruansy.fnst
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