From: Andreas Dilger <adilger@dilger.ca>
To: David Howells <dhowells@redhat.com>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>,
Eric Biggers <ebiggers@kernel.org>, Theodore Ts'o <tytso@mit.edu>,
Ext4 Developers List <linux-ext4@vger.kernel.org>
Subject: Re: Exporting ext4-specific information through fsinfo attributes
Date: Tue, 21 Apr 2020 16:07:43 -0600 [thread overview]
Message-ID: <BFC9114B-7D3D-4B8F-A8BB-75C2770EE36D@dilger.ca> (raw)
In-Reply-To: <2504712.1587485842@warthog.procyon.org.uk>
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On Apr 21, 2020, at 10:17 AM, David Howells <dhowells@redhat.com> wrote:
>
> Darrick J. Wong <darrick.wong@oracle.com> wrote:
>
>> The entire superblock as a binary blob? :)
>
> How about the attached? Please forgive the duplication of struct
> ext4_super_block into the test program, but it's not in the UAPI.
I think (hope?) Darrick was joking?
At least IMHO, exporting the whole superblock as a binary blob is not
a great user interface. I guess it has the benefit of allowing access
to various non-standard fields without accessing the device directly.
Kind of like SCSI mode pages, but that can get ugly quickly...
I can definitely get behind adding generic properties like the ones
you list below.
>
> David
> ---
> fsinfo: Add support to ext4
>
> Add support to ext4, including the following:
>
> (1) FSINFO_ATTR_SUPPORTS: Information about supported STATX attributes and
> support for ioctls like FS_IOC_[GS]ETFLAGS and FS_IOC_FS[GS]ETXATTR.
>
> (2) FSINFO_ATTR_FEATURES: Information about features supported by an ext4
> filesystem, such as whether version counting, birth time and name case
> folding are in operation.
>
> (3) FSINFO_ATTR_VOLUME_NAME: The volume name from the superblock.
>
> (4) FSINFO_ATTR_EXT4_SUPERBLOCK: The entirety of the on disk-format
> superblock record as an opaque blob.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: "Theodore Ts'o" <tytso@mit.edu>
> cc: Andreas Dilger <adilger.kernel@dilger.ca>
> cc: "Darrick J. Wong" <darrick.wong@oracle.com>
> cc: Eric Biggers <ebiggers@kernel.org>
> cc: linux-ext4@vger.kernel.org
Cheers, Andreas
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next prev parent reply other threads:[~2020-04-21 22:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 7:39 Exporting ext4-specific information through fsinfo attributes David Howells
2020-04-01 15:18 ` Darrick J. Wong
2020-04-01 16:27 ` Eric Biggers
2020-04-01 19:05 ` Darrick J. Wong
2020-04-01 19:28 ` Eric Biggers
2020-04-01 20:36 ` Eric Biggers
2020-04-21 16:17 ` David Howells
2020-04-21 22:07 ` Andreas Dilger [this message]
2020-04-22 16:12 ` Darrick J. Wong
2020-07-21 9:20 ` David Howells
2020-07-21 15:37 ` Darrick J. Wong
2020-04-22 14:27 ` David Howells
2020-07-21 15:42 ` Darrick J. Wong
2020-07-22 8:53 ` David Howells
2020-07-22 15:25 ` Darrick J. Wong
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