linux-kernel - Re: [PATCH v2] ext4: check folio uptodate state in ext4_page

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Message-ID: <20251203184022.GJ93777@macsyma.lan>
Date: Wed, 3 Dec 2025 13:40:22 -0500
From: "Theodore Tso" <tytso@....edu>
To: Deepanshu Kartikey <kartikey406@...il.com>
Cc: Zhang Yi <yi.zhang@...weicloud.com>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        syzbot+b0a0670332b6b3230a0a@...kaller.appspotmail.com,
        adilger.kernel@...ger.ca, djwong@...nel.org,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH v2] ext4: check folio uptodate state in
 ext4_page_mkwrite()

On Wed, Dec 03, 2025 at 10:46:57AM -0500, Theodore Tso wrote:
> 
> 	if (!folio_test_uptodate(folio)) {
> 		ret = VM_FAULT_SIGBUS;
> 		goto out;
> 	}

And actually, thinking about this some more, is this check something
that we should be doing in ext4?  Or in the mm layer?

Matthew, what do you think?

     	       	  	   	     	- Ted