lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 2 Jun 2020 11:14:44 -0700 (PDT)
From:   "Darrick J. Wong" <>
To:     Xiao Yang <>
        Dan Williams <>,
        Dave Chinner <>,
        Christoph Hellwig <>,
        "Theodore Y. Ts'o" <>, Jan Kara <>,
        Jeff Moyer <>,,,
Subject: Re: [PATCH] xfs/XXX: Add xfs/XXX

On Tue, Jun 02, 2020 at 04:51:48PM +0800, Xiao Yang wrote:
> On 2020/4/14 0:30, Darrick J. Wong wrote:
> > This might be a good time to introduce a few new helpers:
> > 
> > _require_scratch_dax ("Does $SCRATCH_DEV support DAX?")
> > _require_scratch_dax_mountopt ("Does the fs support the DAX mount options?")
> > _require_scratch_daX_iflag ("Does the fs support FS_XFLAG_DAX?")
> Hi Darrick,
> Now, I am trying to introduce these new helpers and have some questions:
> 1) There are five testcases related to old dax implementation, should we
> only convert them to new dax implementation or make them compatible with old
> and new dax implementation?

What is the 'old' DAX implementation?  ext2 XIP?

> 2) I think _require_xfs_io_command "chattr" "x" is enough to check if fs
> supports FS_XFLAG_DAX.  Is it necessary to add _require_scratch_dax_iflag()?
> like this:
> _require_scratch_dax_iflag()
> {
> 	_require_xfs_io_command "chattr" "x"
> }

I suggested that list based on the major control knobs that will be
visible to userspace programs.  Even if this is just a one-line helper,
its name is useful for recognizing which of those knobs we're looking

Yes, you could probably save a trivial amount of time by skipping one
iteration of bash function calling, but now everyone has to remember
that the xfs_io chattr "x" flag means the dax inode flag, and not
confuse it for chmod +x or something else.


> Best Regards,
> Xiao Yang

Powered by blists - more mailing lists