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From: Josh Triplett <josh@joshtriplett.org>
To: Andreas Dilger <adilger@dilger.ca>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Jan Kara <jack@suse.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: ext4 regression in v5.9-rc2 from e7bfb5c9bb3d on ro fs with overlapped bitmaps
Date: Thu, 8 Oct 2020 15:28:05 -0700	[thread overview]
Message-ID: <20201008222805.GB45658@localhost> (raw)
In-Reply-To: <FEB46ECD-BE83-41E7-B765-ACD310823BB3@dilger.ca>

On Thu, Oct 08, 2020 at 01:25:57PM -0600, Andreas Dilger wrote:
> On Oct 8, 2020, at 1:12 PM, Josh Triplett <josh@joshtriplett.org> wrote:
> > On Wed, Oct 07, 2020 at 08:57:12PM -0600, Andreas Dilger wrote:
> >> I *do* think that inline_data is an under-appreciated feature that I
> >> would be happy to see some improvements with.  I don't think that small
> >> files are a niche use case, and if we can clean up the inline_data code
> >> to work with 128-byte inodes I'm not against that, even though I'm not
> >> going to use that combination of features myself.
> > 
> > I'd love to see that happen. At the time, it seemed like too large of a
> > change to block on, which is why I ended up deciding to switch to
> > 256-byte inodes.
> 
> Does that mean you are using inline_data with 256-byte inodes?

I am, yes, and it mostly works great. I've hit zero issues with it in
the filesystems I'm generating.

> That would also be good to know, since there haven't been any
> well-known users of this feature so far (AFAIK).  Since you are using
> this in a read-only manner, you won't hit the one know issue when an
> inline_data inode is extended to use an external block that may
> temporarily leave the inode in an inconsistent state.

I've run into a few other issues with it in other tools, as well. mke2fs
with inline_data generates invalid files given xattrs:
https://lore.kernel.org/linux-ext4/20200926102512.GA11386@localhost/T/#u

And extlinux doesn't like inline_data at all:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=971002

I'll report any other issues I run into using inline_data. I agree that
it's deeply underappreciated.

- Josh

      reply	other threads:[~2020-10-08 22:28 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-04 23:17 Linux 5.9-rc8 Linus Torvalds
2020-10-05  8:14 ` ext4 regression in v5.9-rc2 from e7bfb5c9bb3d on ro fs with overlapped bitmaps Josh Triplett
2020-10-05  9:46   ` Jan Kara
2020-10-05 10:16     ` Josh Triplett
2020-10-05 16:19       ` Jan Kara
2020-10-05 16:20   ` Jan Kara
2020-10-05 17:36   ` Darrick J. Wong
2020-10-06  0:04     ` Theodore Y. Ts'o
2020-10-06  0:32     ` Josh Triplett
2020-10-06  2:51       ` Darrick J. Wong
2020-10-06  3:18         ` Theodore Y. Ts'o
2020-10-06  5:03           ` Josh Triplett
2020-10-06  6:03             ` Josh Triplett
2020-10-06 13:35             ` Theodore Y. Ts'o
2020-10-07  8:03               ` Josh Triplett
2020-10-07 14:32                 ` Theodore Y. Ts'o
2020-10-07 20:14                   ` Josh Triplett
2020-10-08  2:10                     ` Theodore Y. Ts'o
2020-10-08 17:54                       ` Darrick J. Wong
2020-10-08 22:38                         ` Josh Triplett
2020-10-09  2:54                           ` Darrick J. Wong
2020-10-09 19:08                             ` Josh Triplett
2020-10-08 22:22                       ` Josh Triplett
2020-10-09 14:37                         ` Theodore Y. Ts'o
2020-10-09 20:30                           ` Josh Triplett
2021-01-10 18:41                           ` Malicious fs images was " Pavel Machek
2021-01-11 18:51                             ` Darrick J. Wong
2021-01-11 19:39                               ` Eric Biggers
2021-01-12 21:43                             ` Theodore Ts'o
2021-01-12 22:28                               ` Pavel Machek
2021-01-13  5:09                                 ` Theodore Ts'o
2020-10-08  2:57                     ` Andreas Dilger
2020-10-08 19:12                       ` Josh Triplett
2020-10-08 19:25                         ` Andreas Dilger
2020-10-08 22:28                           ` Josh Triplett [this message]

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