linux-kernel - Re: [PATCH v9 4/8] fsdax: Convert dax_iomap

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Date:   Wed, 15 Sep 2021 17:11:43 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Shiyang Ruan <ruansy.fnst@...itsu.com>
Cc:     hch@....de, linux-xfs@...r.kernel.org, dan.j.williams@...el.com,
        david@...morbit.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, nvdimm@...ts.linux.dev,
        rgoldwyn@...e.de, viro@...iv.linux.org.uk, willy@...radead.org
Subject: Re: [PATCH v9 4/8] fsdax: Convert dax_iomap_zero to iter model

On Wed, Sep 15, 2021 at 06:44:57PM +0800, Shiyang Ruan wrote:
> Let dax_iomap_zero() support iter model.
> 
> Signed-off-by: Shiyang Ruan <ruansy.fnst@...itsu.com>

Oops, I guess we forgot this one when we did the iter conversion last
cycle. :(

Reviewed-by: Darrick J. Wong <djwong@...nel.org>

--D

> ---
>  fs/dax.c               | 3 ++-
>  fs/iomap/buffered-io.c | 3 +--
>  include/linux/dax.h    | 3 ++-
>  3 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 41c93929f20b..4f346e25e488 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1209,8 +1209,9 @@ 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(struct iomap_iter *iter, loff_t pos, u64 length)
>  {
> +	const struct iomap *iomap = &iter->iomap;
>  	sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
>  	pgoff_t pgoff;
>  	long rc, id;
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 9cc5798423d1..84a861d3b3e0 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -889,7 +889,6 @@ static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
>  
>  static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
>  {
> -	struct iomap *iomap = &iter->iomap;
>  	const struct iomap *srcmap = iomap_iter_srcmap(iter);
>  	loff_t pos = iter->pos;
>  	loff_t length = iomap_length(iter);
> @@ -903,7 +902,7 @@ static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
>  		s64 bytes;
>  
>  		if (IS_DAX(iter->inode))
> -			bytes = dax_iomap_zero(pos, length, iomap);
> +			bytes = dax_iomap_zero(iter, pos, length);
>  		else
>  			bytes = __iomap_zero_iter(iter, pos, length);
>  		if (bytes < 0)
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index 2619d94c308d..642de7ef1a10 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -13,6 +13,7 @@ typedef unsigned long dax_entry_t;
>  
>  struct iomap_ops;
>  struct iomap;
> +struct iomap_iter;
>  struct dax_device;
>  struct dax_operations {
>  	/*
> @@ -210,7 +211,7 @@ 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(struct iomap_iter *iter, loff_t pos, u64 length);
>  static inline bool dax_mapping(struct address_space *mapping)
>  {
>  	return mapping->host && IS_DAX(mapping->host);
> -- 
> 2.33.0
> 
> 
>