linux-ext4 - Re: [PATCH v3 1/7] ext4: Document an edge case for overwrites

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Message-ID: <aB2QRwxl-pj9cJ0G@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com>
Date: Fri, 9 May 2025 10:49:03 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Cc: linux-ext4@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>,
        Jan Kara <jack@...e.cz>, John Garry <john.g.garry@...cle.com>,
        djwong@...nel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v3 1/7] ext4: Document an edge case for overwrites

On Fri, May 09, 2025 at 02:20:31AM +0530, Ritesh Harjani (IBM) wrote:
> ext4_iomap_overwrite_begin() clears the flag for IOMAP_WRITE before
> calling ext4_iomap_begin(). Document this above ext4_map_blocks() call
> as it is easy to miss it when focusing on write paths alone.
> 
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
 
Looks good Ritesh. Feel free to add:

Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
> ---
>  fs/ext4/inode.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 94c7d2d828a6..b10e5cd5bb5c 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3436,6 +3436,10 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
>  		}
>  		ret = ext4_iomap_alloc(inode, &map, flags);
>  	} else {
> +		/*
> +		 * This can be called for overwrites path from
> +		 * ext4_iomap_overwrite_begin().
> +		 */
>  		ret = ext4_map_blocks(NULL, inode, &map, 0);
>  	}
>  
> -- 
> 2.49.0
>