linux-ext4 - Re: [RFC PATCH v2 06/25] ext4: make ext4_set_iomap() recognize IOMAP

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Date: Wed, 3 Jan 2024 12:35:06 +0100
From: Jan Kara <jack@...e.cz>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	tytso@....edu, adilger.kernel@...ger.ca, jack@...e.cz,
	ritesh.list@...il.com, hch@...radead.org, djwong@...nel.org,
	willy@...radead.org, yi.zhang@...wei.com, chengzhihao1@...wei.com,
	yukuai3@...wei.com, wangkefeng.wang@...wei.com
Subject: Re: [RFC PATCH v2 06/25] ext4: make ext4_set_iomap() recognize
 IOMAP_DELALLOC map type

On Tue 02-01-24 20:38:59, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
> 
> Since ext4_map_blocks() can recognize a delayed allocated only extent,
> make ext4_set_iomap() can also recognize it, and remove the useless
> separate check in ext4_iomap_begin_report().
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/inode.c | 32 +++-----------------------------
>  1 file changed, 3 insertions(+), 29 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index c141bf6d8db2..0458d7f0c059 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3261,6 +3261,9 @@ static void ext4_set_iomap(struct inode *inode, struct iomap *iomap,
>  		iomap->addr = (u64) map->m_pblk << blkbits;
>  		if (flags & IOMAP_DAX)
>  			iomap->addr += EXT4_SB(inode->i_sb)->s_dax_part_off;
> +	} else if (map->m_flags & EXT4_MAP_DELAYED) {
> +		iomap->type = IOMAP_DELALLOC;
> +		iomap->addr = IOMAP_NULL_ADDR;
>  	} else {
>  		iomap->type = IOMAP_HOLE;
>  		iomap->addr = IOMAP_NULL_ADDR;
> @@ -3423,35 +3426,11 @@ const struct iomap_ops ext4_iomap_overwrite_ops = {
>  	.iomap_end		= ext4_iomap_end,
>  };
>  
> -static bool ext4_iomap_is_delalloc(struct inode *inode,
> -				   struct ext4_map_blocks *map)
> -{
> -	struct extent_status es;
> -	ext4_lblk_t offset = 0, end = map->m_lblk + map->m_len - 1;
> -
> -	ext4_es_find_extent_range(inode, &ext4_es_is_delayed,
> -				  map->m_lblk, end, &es);
> -
> -	if (!es.es_len || es.es_lblk > end)
> -		return false;
> -
> -	if (es.es_lblk > map->m_lblk) {
> -		map->m_len = es.es_lblk - map->m_lblk;
> -		return false;
> -	}
> -
> -	offset = map->m_lblk - es.es_lblk;
> -	map->m_len = es.es_len - offset;
> -
> -	return true;
> -}
> -
>  static int ext4_iomap_begin_report(struct inode *inode, loff_t offset,
>  				   loff_t length, unsigned int flags,
>  				   struct iomap *iomap, struct iomap *srcmap)
>  {
>  	int ret;
> -	bool delalloc = false;
>  	struct ext4_map_blocks map;
>  	u8 blkbits = inode->i_blkbits;
>  
> @@ -3492,13 +3471,8 @@ static int ext4_iomap_begin_report(struct inode *inode, loff_t offset,
>  	ret = ext4_map_blocks(NULL, inode, &map, 0);
>  	if (ret < 0)
>  		return ret;
> -	if (ret == 0)
> -		delalloc = ext4_iomap_is_delalloc(inode, &map);
> -
>  set_iomap:
>  	ext4_set_iomap(inode, iomap, &map, offset, length, flags);
> -	if (delalloc && iomap->type == IOMAP_HOLE)
> -		iomap->type = IOMAP_DELALLOC;
>  
>  	return 0;
>  }
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR