linux-kernel - Re: [PATCH 4/4 v4] brd: Request from fdisk 4k alignment

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Message-ID: <yq1a91t2shx.fsf@sermon.lab.mkp.net>
Date:	Thu, 08 Jan 2015 10:37:30 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Jens Axboe <axboe@...com>, Matthew Wilcox <willy@...ux.intel.com>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH 4/4 v4] brd: Request from fdisk 4k alignment

>>>>> "Boaz" == Boaz Harrosh <boaz@...xistor.com> writes:

Boaz> Because of the direct_access() API which returns a PFN. partitions
Boaz> better start on 4K boundary, else offset ZERO of a partition will
Boaz> not be aligned and blk_direct_access() will fail the call.

Boaz> By setting blk_queue_physical_block_size(PAGE_SIZE) we can
Boaz> communicate this to fdisk and friends.

Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>

-- 
Martin K. Petersen	Oracle Linux Engineering
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