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From: Matthew Wilcox <willy@infradead.org>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>,
	Lukasz Stelmach <l.stelmach@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Song Liu <song@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-raid@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Shaohua Li <shli@fb.com>
Subject: Re: [PATCH 16/23] initramfs: simplify clean_rootfs
Date: Mon, 27 Jul 2020 03:44:26 +0100	[thread overview]
Message-ID: <20200727024426.GI23808@casper.infradead.org> (raw)
In-Reply-To: <20200727024149.GB795125@ZenIV.linux.org.uk>

On Mon, Jul 27, 2020 at 03:41:49AM +0100, Al Viro wrote:
> On Thu, Jul 23, 2020 at 04:27:34PM +0200, Christoph Hellwig wrote:
> > On Thu, Jul 23, 2020 at 04:25:34PM +0200, Lukasz Stelmach wrote:
> > > >> Can you comment out the call to d_genocide?  It seems like for your
> > > >> the fact that clean_rootfs didn't actually clean up was a feature and
> > > >> not a bug.
> > > >> 
> > > >> I guess the old, pre-2008 code also wouldn't have worked for you in
> > > >> that case.
> > > >
> > > > Did you get a chance to try this?
> > > 
> > > Indeed, commenting out d_genocide() helps.
> > 
> > So given that people have relied on at least the basic device nodes
> > like /dev/console to not go away since 2008, I wonder if we should just
> > remove clean_rootfs entirely
> > 
> > Linus, Al?
> 
> First of all, d_genocide() is simply wrong here from VFS point of view.  _IF_
> you want recursive removal, you need simple_recursive_remove(path.dentry, NULL).
> And it's a userland-visible change of behaviour.
> 
> As for removal of clean_rootfs()...  FWIW, the odds of an image that would
> eventually fail accidentally getting past the signature mismatch check are
> fairly low.  I've no idea what scenario the author of that thing used to have;
> that would be Shaohua Li <shaohua.li@intel.com>.  Cc'd...

Shaohua is now at Facebook.

  reply	other threads:[~2020-07-27  2:44 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 19:04 decruft the early init / initrd / initramfs code v2 Christoph Hellwig
2020-07-14 19:04 ` [PATCH 01/23] fs: add a vfs_fchown helper Christoph Hellwig
2020-07-14 19:04 ` [PATCH 02/23] fs: add a vfs_fchmod helper Christoph Hellwig
2020-07-14 19:04 ` [PATCH 03/23] init: remove the bstat helper Christoph Hellwig
2020-07-15 23:14   ` NeilBrown
2020-07-14 19:04 ` [PATCH 04/23] md: move the early init autodetect code to drivers/md/ Christoph Hellwig
2020-07-14 19:04 ` [PATCH 05/23] md: replace the RAID_AUTORUN ioctl with a direct function call Christoph Hellwig
2020-07-15 23:33   ` NeilBrown
2020-07-14 19:04 ` [PATCH 06/23] md: remove the autoscan partition re-read Christoph Hellwig
2020-07-15 23:34   ` NeilBrown
2020-07-14 19:04 ` [PATCH 07/23] md: remove the kernel version of md_u.h Christoph Hellwig
2020-07-14 19:04 ` [PATCH 08/23] md: simplify md_setup_drive Christoph Hellwig
2020-07-15 23:37   ` NeilBrown
2020-07-14 19:04 ` [PATCH 09/23] md: rewrite md_setup_drive to avoid ioctls Christoph Hellwig
2020-07-15 23:50   ` NeilBrown
2020-07-16 13:38     ` Christoph Hellwig
2020-07-14 19:04 ` [PATCH 10/23] initrd: remove support for multiple floppies Christoph Hellwig
2020-07-14 19:04 ` [PATCH 11/23] initrd: remove the BLKFLSBUF call in handle_initrd Christoph Hellwig
2020-07-14 19:04 ` [PATCH 12/23] initrd: switch initrd loading to struct file based APIs Christoph Hellwig
2020-07-27  1:50   ` Al Viro
2020-07-14 19:04 ` [PATCH 13/23] initrd: mark init_linuxrc as __init Christoph Hellwig
2020-07-14 19:04 ` [PATCH 14/23] initrd: mark initrd support as deprecated Christoph Hellwig
2020-07-14 19:04 ` [PATCH 15/23] initramfs: remove the populate_initrd_image and clean_rootfs stubs Christoph Hellwig
2020-07-14 19:04 ` [PATCH 16/23] initramfs: simplify clean_rootfs Christoph Hellwig
     [not found]   ` <CGME20200717205549eucas1p13fca9a8496836faa71df515524743648@eucas1p1.samsung.com>
2020-07-17 20:55     ` Marek Szyprowski
2020-07-18 10:00       ` Christoph Hellwig
2020-07-23  9:22         ` Christoph Hellwig
2020-07-23 14:25           ` Lukasz Stelmach
2020-07-23 14:27             ` Christoph Hellwig
2020-07-27  2:41               ` Al Viro
2020-07-27  2:44                 ` Matthew Wilcox [this message]
2020-07-14 19:04 ` [PATCH 17/23] initramfs: switch initramfs unpacking to struct file based APIs Christoph Hellwig
2020-07-14 19:31   ` Linus Torvalds
2020-07-15  6:27     ` Christoph Hellwig
2020-07-27  2:55   ` Al Viro
2020-07-14 19:04 ` [PATCH 18/23] init: open code setting up stdin/stdout/stderr Christoph Hellwig
2020-07-27  3:05   ` Al Viro
2020-07-27  5:46     ` Christoph Hellwig
2020-07-27  6:03       ` Al Viro
2020-07-27  6:48         ` Christoph Hellwig
2020-07-27 15:54           ` Al Viro
2020-07-27 15:58             ` Christoph Hellwig
2020-07-27  6:20     ` hpa
2020-07-27  6:24       ` Christoph Hellwig
2020-07-27  6:36         ` hpa
2020-07-27  6:49           ` Christoph Hellwig
2020-07-14 19:04 ` [PATCH 19/23] fs: remove ksys_getdents64 Christoph Hellwig
2020-07-14 19:04 ` [PATCH 20/23] fs: remove ksys_open Christoph Hellwig
2020-07-14 19:04 ` [PATCH 21/23] fs: remove ksys_dup Christoph Hellwig
2020-07-14 19:04 ` [PATCH 22/23] fs: remove ksys_fchmod Christoph Hellwig
2020-07-14 19:04 ` [PATCH 23/23] fs: remove ksys_ioctl Christoph Hellwig
2020-07-14 19:34 ` decruft the early init / initrd / initramfs code v2 Linus Torvalds
2020-07-15  6:51   ` Christoph Hellwig
2020-07-16 15:57     ` Guoqing Jiang
2020-07-16 16:00       ` Christoph Hellwig

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