linux-kernel - Re: [PATCH 2/2] erofs: enable large folio support for non-compressed format

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Message-ID: <Y4F3EGk+0najgTco@debian>
Date:   Sat, 26 Nov 2022 10:16:48 +0800
From:   Gao Xiang <xiang@...nel.org>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>
Cc:     xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] erofs: enable large folio support for non-compressed
 format

Hi Jingbo,

On Sat, Nov 26, 2022 at 08:57:56AM +0800, Jingbo Xu wrote:
> Enable large folio in both device and fscache mode.  Then the readahead

         ^ large folios in both iomap and fscache modes.

I tend to enable iomap/fscache large folios with two patches.
Also please see dev-test branch.


> routine will pass down large folio containing multiple pages.
> 
> Enable this feature for non-compressed format for now, until the
> compression part supports large folio later.

                            ^ large folios

> 
> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
> ---
>  fs/erofs/fscache.c | 1 +
>  fs/erofs/inode.c   | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
> index 0643b205c7eb..d2dd58ce312b 100644
> --- a/fs/erofs/fscache.c
> +++ b/fs/erofs/fscache.c
> @@ -436,6 +436,7 @@ struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
>  		inode->i_size = OFFSET_MAX;
>  		inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
>  		mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
> +		mapping_set_large_folios(inode->i_mapping);
>  

Meta inodes currently doesn't need large folios for now, and
we don't have readahead policy for these.

>  		ctx->inode = inode;
>  	}
> diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
> index ad2a82f2eb4c..85932086d23f 100644
> --- a/fs/erofs/inode.c
> +++ b/fs/erofs/inode.c
> @@ -295,6 +295,7 @@ static int erofs_fill_inode(struct inode *inode)
>  		goto out_unlock;
>  	}
>  	inode->i_mapping->a_ops = &erofs_raw_access_aops;
> +	mapping_set_large_folios(inode->i_mapping);
>  #ifdef CONFIG_EROFS_FS_ONDEMAND
>  	if (erofs_is_fscache_mode(inode->i_sb))
>  		inode->i_mapping->a_ops = &erofs_fscache_access_aops;
> -- 
> 2.19.1.6.gb485710b
>