Re: [PATCH 3/3] ext4: Deprecate barrier= and nobarrier mountoptions

From: Tejun Heo
Date: Wed Jan 26 2011 - 04:36:43 EST


On Tue, Jan 25, 2011 at 11:23:29PM -0800, Darrick J. Wong wrote:
> As part of migrating the FLUSH/FUA knob to the block layer, remove the support
> code for the barrier-related mount options and remove the conditionals around
> flushes in favor of always issuing the flush. The block layer will handle
> gracefully the situation where a FLUSH or FUA request is issued to a device
> that doesn't support it. Modify the option parsing code to print a warning if
> someone tries to use the old mount option.
> Note: The nobarrier bit in the default mount flags is now useless.

The option is something which users are already quite familiar with.
I think we'll just have to carry this around. What we can do, tho, is
moving the actual control mechanism to block layer -
ie. blkdev_skip_flush() or something like that which ignores flush
requests for the current exclusive opener.


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