From: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
To: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org
Cc: jack@suse.cz, darrick.wong@oracle.com, david@fromorbit.com,
ocfs2-devel@oss.oracle.com, viro@zeniv.linux.org.uk,
dan.j.williams@intel.com, linux-btrfs@vger.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH 1/7] fsdax: Output address in dax_iomap_pfn() and rename it
Date: Mon, 22 Feb 2021 15:44:26 +0800 [thread overview]
Message-ID: <cd067457-5aaf-a2a9-06b0-953f49437500@linux.alibaba.com> (raw)
In-Reply-To: <20210207170924.2933035-2-ruansy.fnst@cn.fujitsu.com>
hi,
> Add address output in dax_iomap_pfn() in order to perform a memcpy() in
> CoW case. Since this function both output address and pfn, rename it to
> dax_iomap_direct_access().
>
> Signed-off-by: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com>
> ---
> fs/dax.c | 20 +++++++++++++++-----
> 1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index 5b47834f2e1b..b012b2db7ba2 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -998,8 +998,8 @@ static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos)
> return (iomap->addr + (pos & PAGE_MASK) - iomap->offset) >> 9;
> }
>
> -static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
> - pfn_t *pfnp)
> +static int dax_iomap_direct_access(struct iomap *iomap, loff_t pos, size_t size,
> + void **kaddr, pfn_t *pfnp)
> {
> const sector_t sector = dax_iomap_sector(iomap, pos);
> pgoff_t pgoff;
> @@ -1011,11 +1011,13 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
> return rc;
> id = dax_read_lock();
> length = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(size),
> - NULL, pfnp);
> + kaddr, pfnp);
> if (length < 0) {
> rc = length;
> goto out;
> }
> + if (!pfnp)
Should this be "if (!*pfnp)"?
Regards,
Xiaoguang Wang
> + goto out_check_addr;
> rc = -EINVAL;
> if (PFN_PHYS(length) < size)
> goto out;
> @@ -1025,6 +1027,12 @@ static int dax_iomap_pfn(struct iomap *iomap, loff_t pos, size_t size,
> if (length > 1 && !pfn_t_devmap(*pfnp))
> goto out;
> rc = 0;
> +
> +out_check_addr:
> + if (!kaddr)
> + goto out;
> + if (!*kaddr)
> + rc = -EFAULT;
> out:
> dax_read_unlock(id);
> return rc;
> @@ -1348,7 +1356,8 @@ static vm_fault_t dax_iomap_pte_fault(struct vm_fault *vmf, pfn_t *pfnp,
> count_memcg_event_mm(vma->vm_mm, PGMAJFAULT);
> major = VM_FAULT_MAJOR;
> }
> - error = dax_iomap_pfn(&iomap, pos, PAGE_SIZE, &pfn);
> + error = dax_iomap_direct_access(&iomap, pos, PAGE_SIZE,
> + NULL, &pfn);
> if (error < 0)
> goto error_finish_iomap;
>
> @@ -1566,7 +1575,8 @@ static vm_fault_t dax_iomap_pmd_fault(struct vm_fault *vmf, pfn_t *pfnp,
>
> switch (iomap.type) {
> case IOMAP_MAPPED:
> - error = dax_iomap_pfn(&iomap, pos, PMD_SIZE, &pfn);
> + error = dax_iomap_direct_access(&iomap, pos, PMD_SIZE,
> + NULL, &pfn);
> if (error < 0)
> goto finish_iomap;
>
>
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next prev parent reply other threads:[~2021-02-26 16:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-07 17:09 [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 1/7] fsdax: Output address in dax_iomap_pfn() and rename it Shiyang Ruan
2021-02-08 15:11 ` Christoph Hellwig
2021-02-22 7:44 ` Xiaoguang Wang [this message]
2021-02-23 1:32 ` [Ocfs2-devel] 回复: " ruansy.fnst
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 2/7] fsdax: Introduce dax_copy_edges() for CoW Shiyang Ruan
2021-02-08 15:11 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 3/7] fsdax: Copy data before write Shiyang Ruan
2021-02-08 15:14 ` Christoph Hellwig
2021-02-09 1:53 ` Ruan Shiyang
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 4/7] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-02-08 15:16 ` Christoph Hellwig
2021-02-16 13:11 ` David Sterba
2021-02-17 3:06 ` Ruan Shiyang
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 5/7] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-02-08 15:19 ` Christoph Hellwig
2021-02-09 9:15 ` Ruan Shiyang
2021-02-09 9:34 ` Christoph Hellwig
2021-02-09 9:46 ` Ruan Shiyang
2021-02-10 13:19 ` Christoph Hellwig
2021-02-17 3:24 ` Ruan Shiyang
2021-02-18 16:20 ` Darrick J. Wong
2021-02-25 7:35 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 6/7] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-02-08 15:24 ` Christoph Hellwig
2021-02-07 17:09 ` [Ocfs2-devel] [PATCH 7/7] fs/xfs: Add dedupe support for fsdax Shiyang Ruan
2021-02-08 15:39 ` [Ocfs2-devel] [PATCH 0/7] fsdax, xfs: Add reflink&dedupe " Jan Kara
2021-02-09 1:50 ` Ruan Shiyang
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