linux-kernel - Re: [PATCH 003 of 3] md: Update md bitmap during resync.

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Date:	Mon, 10 Dec 2007 15:04:14 -0500
From:	"Mike Snitzer" <snitzer@...il.com>
To:	NeilBrown <neilb@...e.de>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 003 of 3] md: Update md bitmap during resync.

On Dec 7, 2007 12:42 AM, NeilBrown <neilb@...e.de> wrote:
>
> Currently and md array with a write-intent bitmap does not updated
> that bitmap to reflect successful partial resync.  Rather the entire
> bitmap is updated when the resync completes.
>
> This is because there is no guarentee that resync requests will
> complete in order, and tracking each request individually is
> unnecessarily burdensome.
>
> However there is value in regularly updating the bitmap, so add code
> to periodically pause while all pending sync requests complete, then
> update the bitmap.  Doing this only every few seconds (the same as the
> bitmap update time) does not notciably affect resync performance.
>
> Signed-off-by: Neil Brown <neilb@...e.de>

Hi Neil,

You forgot to export bitmap_cond_end_sync.  Please see the attached patch.

regards,
Mike

View attachment "export_bitmap_cond_end_sync.patch" of type "text/x-patch" (330 bytes)