linux-ext4 - Re: [PATCH] ext4: remove the redundant folio_wait

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Date: Fri, 19 Apr 2024 11:28:55 +0200
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,
	yi.zhang@...wei.com, chengzhihao1@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH] ext4: remove the redundant folio_wait_stable()

On Fri 19-04-24 10:30:05, Zhang Yi wrote:
> From: Zhang Yi <yi.zhang@...wei.com>
> 
> __filemap_get_folio() with FGP_WRITEBEGIN parameter has already wait
> for stable folio, so remove the redundant folio_wait_stable() in
> ext4_da_write_begin(), it was left over from the commit cc883236b792
> ("ext4: drop unnecessary journal handle in delalloc write") that
> removed the retry getting page logic.
> 
> Fixes: cc883236b792 ("ext4: drop unnecessary journal handle in delalloc write")
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good. Feel free to add:

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

								Honza

> ---
>  fs/ext4/inode.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 537803250ca9..6de6bf57699b 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -2887,9 +2887,6 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
>  	if (IS_ERR(folio))
>  		return PTR_ERR(folio);
>  
> -	/* In case writeback began while the folio was unlocked */
> -	folio_wait_stable(folio);
> -
>  #ifdef CONFIG_FS_ENCRYPTION
>  	ret = ext4_block_write_begin(folio, pos, len, ext4_da_get_block_prep);
>  #else
> -- 
> 2.39.2
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR