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

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Message-ID: <971671b3-fa79-4ac1-8929-e578c8fcb32e@I-love.SAKURA.ne.jp>
Date: Sat, 26 Jul 2025 07:25:54 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Viacheslav Dubeyko <Slava.Dubeyko@....com>,
        "willy@...radead.org" <willy@...radead.org>
Cc: "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 2025/07/26 2:45, Viacheslav Dubeyko wrote:
> If we manage the inode IDs properly in hfs_read_inode(), then hfs_write_inode()
> never will receive the invalid inode ID. I don't see the point to remove the
> BUG() in hfs_write_inode().

As long as we don't check that rec.dir.DirID is HFS_ROOT_CNID at hfs_fill_super(), 
hfs_write_inode() shall receive the invalid inode ID upon unmount operation.