linux-kernel - Re: [bug report] ext4: refactor zeroout path and handle all cases

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Message-ID: <aYYMUgzc8qk3Gtb1@li-dc0c254c-257c-11b2-a85c-98b6c1322444.ibm.com>
Date: Fri, 6 Feb 2026 21:14:18 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: linux-ext4@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [bug report] ext4: refactor zeroout path and handle all cases

On Fri, Feb 06, 2026 at 04:40:38PM +0300, Dan Carpenter wrote:
> [ Smatch checking is paused while we raise funding.  #SadFace
>   https://lore.kernel.org/all/aTaiGSbWZ9DJaGo7@stanley.mountain/ -dan ]
> 
> Hello Ojaswin Mujoo,
> 
> Commit a985e07c2645 ("ext4: refactor zeroout path and handle all
> cases") from Jan 23, 2026 (linux-next), leads to the following Smatch
> static checker warning:
> 
> 	fs/ext4/extents.c:3369 ext4_split_extent_zeroout()
> 	warn: duplicate zero check 'err' (previous on line 3363)
> 
> fs/ext4/extents.c
>     3361 
>     3362         err = ext4_ext_get_access(handle, inode, path + depth);
>     3363         if (err)
>     3364                 return err;
>     3365 
>     3366         ext4_ext_mark_initialized(ex);
>     3367 
>     3368         ext4_ext_dirty(handle, inode, path + depth);
> 
> Presumably "err = ext4_ext_dirty()".
> 
> --> 3369         if (err)
>     3370                 return err;
>     3371 
>     3372         return 0;
>     3373 }
> 
> regards,
> dan carpenter

Hi dan,

Thanks for the report, I'll send a patch for this.

Many thanks for all the work you do and hope you are able to work out a 
way to carry the smatch project forward!

Regards,
ojaswin