From: "Mika Penttilä" <mika.penttila@nextfour.com>
To: Shiyang Ruan <ruansy.fnst@fujitsu.com>,
linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org
Cc: darrick.wong@oracle.com, willy@infradead.org,
viro@zeniv.linux.org.uk, david@fromorbit.com, hch@lst.de,
rgoldwyn@suse.de
Subject: Re: [PATCH v5 3/7] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero
Date: Wed, 12 May 2021 05:27:16 +0300 [thread overview]
Message-ID: <4c944ccc-7708-5dbd-18c3-9ecb5c3a539f@nextfour.com> (raw)
In-Reply-To: <20210511030933.3080921-4-ruansy.fnst@fujitsu.com>
Hi,
On 11.5.2021 6.09, Shiyang Ruan wrote:
> Punch hole on a reflinked file needs dax_copy_edge() too. Otherwise,
> data in not aligned area will be not correct. So, add the srcmap to
> dax_iomap_zero() and replace memset() as dax_copy_edge().
>
> Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com>
> Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>
> ---
> fs/dax.c | 25 +++++++++++++++----------
> fs/iomap/buffered-io.c | 2 +-
> include/linux/dax.h | 3 ++-
> 3 files changed, 18 insertions(+), 12 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index ef0e564e7904..ee9d28a79bfb 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1186,7 +1186,8 @@ 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, struct iomap *iomap,
> + struct iomap *srcmap)
> {
> sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
> pgoff_t pgoff;
> @@ -1208,19 +1209,23 @@ 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(offset, size, PAGE_SIZE, srcmap,
> + kaddr);
offset above is offset in page, think dax_iomap_cow_copy() expects
absolute pos
> + if (rc < 0)
> + goto out;
> + } else
> + memset(kaddr + offset, 0, size);
> dax_flush(iomap->dax_dev, kaddr + offset, size);
> }
> +
> +out:
> dax_read_unlock(id);
> - return size;
> + return rc < 0 ? rc : size;
> }
>
> static loff_t
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index f2cd2034a87b..2734955ea67f 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -933,7 +933,7 @@ static loff_t iomap_zero_range_actor(struct inode *inode, loff_t pos,
> s64 bytes;
>
> if (IS_DAX(inode))
> - bytes = dax_iomap_zero(pos, length, iomap);
> + bytes = dax_iomap_zero(pos, length, iomap, srcmap);
> else
> bytes = iomap_zero(inode, pos, length, iomap, srcmap);
> if (bytes < 0)
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index b52f084aa643..3275e01ed33d 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -237,7 +237,8 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
> int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
> int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
> pgoff_t index);
> -s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap);
> +s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap,
> + struct iomap *srcmap);
> static inline bool dax_mapping(struct address_space *mapping)
> {
> return mapping->host && IS_DAX(mapping->host);
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next prev parent reply other threads:[~2021-05-12 2:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 3:09 [PATCH v5 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax Shiyang Ruan
2021-05-11 3:09 ` [PATCH v5 1/7] fsdax: Introduce dax_iomap_cow_copy() Shiyang Ruan
2021-05-12 1:08 ` Darrick J. Wong
2021-05-13 7:57 ` ruansy.fnst
2021-05-13 15:02 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 2/7] fsdax: Replace mmap entry in case of CoW Shiyang Ruan
2021-05-12 1:09 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 3/7] fsdax: Add dax_iomap_cow_copy() for dax_iomap_zero Shiyang Ruan
2021-05-12 1:17 ` Darrick J. Wong
2021-05-12 1:37 ` ruansy.fnst
2021-05-12 2:27 ` Mika Penttilä [this message]
2021-05-13 7:48 ` ruansy.fnst
2021-05-11 3:09 ` [PATCH v5 4/7] iomap: Introduce iomap_apply2() for operations on two files Shiyang Ruan
2021-05-11 3:09 ` [PATCH v5 5/7] fsdax: Dedup file range to use a compare function Shiyang Ruan
2021-05-12 1:23 ` Darrick J. Wong
2021-05-14 8:35 ` ruansy.fnst
2021-05-14 16:03 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 6/7] fs/xfs: Handle CoW for fsdax write() path Shiyang Ruan
2021-05-12 1:30 ` Darrick J. Wong
2021-05-11 3:09 ` [PATCH v5 7/7] fs/xfs: Add dax dedupe support Shiyang Ruan
2021-05-12 1:04 ` Darrick J. Wong
2021-05-12 1:26 ` ruansy.fnst
2021-05-11 3:57 ` [PATCH v5 0/7] fsdax,xfs: Add reflink&dedupe support for fsdax Darrick J. Wong
2021-05-11 5:53 ` ruansy.fnst
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