Re: [PATCH] README: add supported fs list

["Darrick J. Wong" <djwong@kernel.org>]

On Fri, Feb 28, 2025 at 04:05:14AM +0800, Zorro Lang wrote:
> To clarify the supported filesystems by fstests, add a fs list to
> README file.
> 
> Signed-off-by: Zorro Lang <zlang@kernel.org>
> ---
> 
> Hi,
> 
> David Sterba suggests to have a supported fs list in fstests:
> 
> https://lore.kernel.org/fstests/20250227073535.7gt7mj5gunp67axr@dell-per750-06-vm-08.rhts.eng.pek2.redhat.com/T/#m742e4f1f6668d39c1a48450e7176a366e0a2f6f9
> 
> I think that's a good suggestion, so I send this patch now. But tell the truth,
> it's hard to find all filesystems which are supported by fstests. Especially
> some filesystems might use fstests, but never be metioned in fstests code.
> So please review this patch or send another patch to tell fstests@ list, if
> you know any other filesystem is suppported.
> 
> And if anyone has review point about the support "level" and "comment" part,
> please feel free to tell me :)
> 
> Thanks,
> Zorro
> 
>  README | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 82 insertions(+)
> 
> diff --git a/README b/README
> index 024d39531..055935917 100644
> --- a/README
> +++ b/README
> @@ -1,3 +1,85 @@
> +_______________________
> +SUPPORTED FS LIST
> +_______________________
> +
> +History
> +-------
> +
> +Firstly, xfstests is the old name of this project, due to it was originally
> +developed for testing the XFS file system on the SGI's Irix operating system.
> +With xfs was ported to Linux, so was xfstests, now it only supports Linux.

   When

> +
> +As xfstests has some test cases are good to run on some other filesystems,

                   many test cases that can be run

> +we call them "generic" (and "shared", but it has been removed) cases, you
> +can find them in tests/generic/ directory. Then more and more filesystems
> +started to use xfstests, and contribute patches. Today xfstests is used
> +as a file system regression test suite for lots of Linux's major file systems.
> +So it's not "xfs"tests only, we tend to call it "fstests" now.
> +
> +Supported fs
> +------------
> +
> +Firstly, there's not hard restriction about which filesystem can use fstests.
> +Any filesystem can give fstests a try.
> +
> +Although fstests supports many filesystems, they have different support level
> +by fstests. So mark it with 4 levels as below:
> +
> +L1: Fstests can be run on the specified fs basically.
> +L2: Rare support from the specified fs list to fix some generic test failures.
> +L3: Normal support from the specified fs list, has some own cases.
> +L4: Active support from the fs list, has lots of own cases.
> +
> ++------------+-------+---------------------------------------------------------+
> +| Filesystem | Level |                       Comment                           |
> ++------------+-------+---------------------------------------------------------+
> +| AFS        |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Bcachefs   |  L1+  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Btrfs      |  L4   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Ceph       |  L2   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| CIFS       |  L2-  | https://wiki.samba.org/index.php/Xfstesting-cifs        |
> ++------------+-------+---------------------------------------------------------+
> +| Ext2/3/4   |  L3+  | N/A                                                     |

What do the plus and minus mean?

> ++------------+-------+---------------------------------------------------------+
> +| Exfat      |  L1+  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| f2fs       |  L3-  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| FUSE       |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| GFS2       |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Glusterfs  |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| JFS        |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| NFS        |  L2+  | https://linux-nfs.org/wiki/index.php/Xfstests           |
> ++------------+-------+---------------------------------------------------------+
> +| ocfs2      |  L2-  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| overlay    |  L3   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| pvfs2      |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Reiser4    |  L1   | Reiserfs has been removed, only left reiser4            |
> ++------------+-------+---------------------------------------------------------+
> +| tmpfs      |  L3-  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| ubifs      |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| udf        |  L1+  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| Virtiofs   |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| XFS        |  L4+  | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+
> +| 9p         |  L1   | N/A                                                     |
> ++------------+-------+---------------------------------------------------------+

This roughly tracks with my observations over the years.

--D

> +
>  _______________________
>  BUILDING THE FSQA SUITE
>  _______________________
> -- 
> 2.47.1
> 
>