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Re: [PATCH 1/1 linux-next] ext4: add compatibility flag check

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On Thu, Nov 24, 2016 at 08:47:41PM +0100, Fabian Frederick wrote:
> data=journal mount option should disable O_DIRECT access
> (See Documentation/filesystems/ext4.txt) but open operations
> using O_CREAT|O_RDWR|O_DIRECT|O_SYNC have no warning in return and file is being
> created. This patch adds vfs super_operations compatibility flag function
> returning -EPERM in such a case.
> 
> Signed-off-by: Fabian Frederick <fabf@skynet.be>

The general practice by most file systems in Linux (for better or for
worse) is to silently fall back to buffered I/O instead of failing the
O_DIRECT open.  Feel free to try to convince linux-fsdevel otherwise,
but that is the general and historical consensus of Linux file system
developers.

Cheers,

					- Ted

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[PATCH 1/1 linux-next] ext4: add compatibility flag check Fabian Frederick <fabf@skynet.be> - 2016-11-24 20:50 +0100
  Re: [PATCH 1/1 linux-next] ext4: add compatibility flag check Al Viro <viro@ZenIV.linux.org.uk> - 2016-11-24 21:40 +0100
    Re: [PATCH 1/1 linux-next] ext4: add compatibility flag check Fabian Frederick <fabf@skynet.be> - 2016-11-24 22:50 +0100
  Re: [PATCH 1/1 linux-next] ext4: add compatibility flag check Theodore Ts'o <tytso@mit.edu> - 2016-11-25 06:30 +0100
    Re: [PATCH 1/1 linux-next] ext4: add compatibility flag check Fabian Frederick <fabf@skynet.be> - 2016-11-25 07:20 +0100

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