From: Dan Williams <dan.j.williams@intel.com>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>,
Christoph Hellwig <hch@lst.de>,
linux-xfs <linux-xfs@vger.kernel.org>,
david <david@fromorbit.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux NVDIMM <nvdimm@lists.linux.dev>,
Goldwyn Rodrigues <rgoldwyn@suse.de>,
Al Viro <viro@zeniv.linux.org.uk>,
Matthew Wilcox <willy@infradead.org>,
Ritesh Harjani <riteshh@linux.ibm.com>
Subject: Re: [PATCH v7 4/8] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero
Date: Thu, 19 Aug 2021 19:39:00 -0700 [thread overview]
Message-ID: <CAPcyv4gFDyXqu5NyrWQ9Y_JqjLmCb8pWQgPZVBYE=dOir2KdzA@mail.gmail.com> (raw)
In-Reply-To: <20210816060359.1442450-5-ruansy.fnst@fujitsu.com>
On Sun, Aug 15, 2021 at 11:04 PM Shiyang Ruan <ruansy.fnst@fujitsu.com> wrote:
>
> Punch hole on a reflinked file needs dax_iomap_cow_copy() too.
> Otherwise, data in not aligned area will be not correct. So, add the
> srcmap to dax_iomap_zero() and replace memset() as dax_iomap_cow_copy().
>
> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
> Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> ---
> fs/dax.c | 25 +++++++++++++++----------
> fs/iomap/buffered-io.c | 4 ++--
> include/linux/dax.h | 3 ++-
> 3 files changed, 19 insertions(+), 13 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index e49ba68cc7e4..91ceb518f66a 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1198,7 +1198,8 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
> }
> #endif /* CONFIG_FS_DAX_PMD */
>
> -s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
> +s64 dax_iomap_zero(loff_t pos, u64 length, const struct iomap *iomap,
> + const struct iomap *srcmap)
> {
> sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
> pgoff_t pgoff;
> @@ -1220,19 +1221,23 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
>
> if (page_aligned)
> rc = dax_zero_page_range(iomap->dax_dev, pgoff, 1);
> - else
> + else {
> rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
> - if (rc < 0) {
> - dax_read_unlock(id);
> - return rc;
> - }
> -
> - if (!page_aligned) {
> - memset(kaddr + offset, 0, size);
> + if (rc < 0)
> + goto out;
> + if (iomap->addr != srcmap->addr) {
> + rc = dax_iomap_cow_copy(pos, size, PAGE_SIZE, srcmap,
> + kaddr);
Apologies, I'm confused, why is it ok to skip zeroing here?
next prev parent reply other threads:[~2021-08-20 2:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-16 6:03 [PATCH v7 0/8] fsdax,xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-08-16 6:03 ` [PATCH v7 1/8] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-08-18 21:01 ` Dan Williams
2021-08-16 6:03 ` [PATCH v7 2/8] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-08-19 22:35 ` Dan Williams
2021-08-20 5:59 ` ruansy.fnst
2021-08-16 6:03 ` [PATCH v7 3/8] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-08-19 22:54 ` Dan Williams
2021-08-23 12:57 ` Christoph Hellwig
2021-08-27 3:22 ` Shiyang Ruan
2021-08-27 5:00 ` Dan Williams
2021-08-27 5:26 ` Shiyang Ruan
2021-08-16 6:03 ` [PATCH v7 4/8] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-08-20 2:39 ` Dan Williams [this message]
2021-08-27 3:23 ` Shiyang Ruan
2021-08-16 6:03 ` [PATCH v7 5/8] iomap: Introduce iomap_iter2 for two files Shiyang Ruan
2021-08-23 12:58 ` Christoph Hellwig
2021-08-16 6:03 ` [PATCH v7 6/8] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-08-23 13:16 ` Christoph Hellwig
2021-08-16 6:03 ` [PATCH v7 7/8] fsdax: Introduce dax_iomap_ops for end of reflink Shiyang Ruan
2021-08-20 3:01 ` Dan Williams
2021-08-20 6:13 ` ruansy.fnst
2021-08-20 15:18 ` Dan Williams
2021-08-23 13:02 ` Christoph Hellwig
2021-08-27 3:29 ` Shiyang Ruan
2021-08-27 5:04 ` Dan Williams
2021-08-27 5:27 ` Shiyang Ruan
2021-08-16 6:03 ` [PATCH v7 8/8] fs/xfs: Add dax dedupe support Shiyang Ruan
2021-08-20 3:08 ` Dan Williams
2021-08-27 3:36 ` Shiyang Ruan
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