linux-kernel - Re: [PATCH v3] hfs: remove BUG() from hfs_release_folio()/hfs_test_inode()/hfs_write

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Message-ID: <aH-SbYUKE1Ydb-tJ@casper.infradead.org>
Date: Tue, 22 Jul 2025 14:30:21 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc: Viacheslav Dubeyko <Slava.Dubeyko@....com>,
	"glaubitz@...sik.fu-berlin.de" <glaubitz@...sik.fu-berlin.de>,
	"frank.li@...o.com" <frank.li@...o.com>,
	"slava@...eyko.com" <slava@...eyko.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3] hfs: remove BUG() from
 hfs_release_folio()/hfs_test_inode()/hfs_write_inode()

On Tue, Jul 22, 2025 at 07:42:35PM +0900, Tetsuo Handa wrote:
> I can update patch description if you have one, but I don't plan to try something like below.

Why not?  Papering over the underlying problem is what I rejected in v1,
and here we are months later with you trying a v4.

> @@ -393,20 +393,30 @@ struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_
>         switch (rec->type) {
>         case HFS_CDR_DIR:
>                 cnid = be32_to_cpu(rec->dir.DirID);
>                 break;
>         case HFS_CDR_FIL:
>                 cnid = be32_to_cpu(rec->file.FlNum);
>                 break;
>         default:
>                 return NULL;
>         }
> +       if (cnid < HFS_FIRSTUSER_CNID) {
> +               switch (cnid) {
> +               case HFS_ROOT_CNID:
> +               case HFS_EXT_CNID:
> +               case HFS_CAT_CNID:
> +                       break;
> +               default:
> +                       return NULL;
> +               }
> +       }
>         inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
>         if (inode && (inode->i_state & I_NEW))
>                 unlock_new_inode(inode);
>         return inode;
>  }
>