From: Andrew Morton <akpm@osdl.org>
To: Paul Clements <paul.clements@steeleye.com>
Cc: neilb@suse.de, linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 008 of 8] md/bitmap: Change md/bitmap file handling to use bmap to file blocks.
Date: Sat, 13 May 2006 08:42:08 -0700 [thread overview]
Message-ID: <20060513084208.0857ff52.akpm@osdl.org> (raw)
In-Reply-To: <4465FB5C.6070808@steeleye.com>
Paul Clements <paul.clements@steeleye.com> wrote:
>
> Andrew Morton wrote:
>
> > The loss of pagecache coherency seems sad. I assume there's never a
> > requirement for userspace to read this file.
>
> Actually, there is. mdadm reads the bitmap file, so that would be
> broken. Also, it's just useful for a user to be able to read the bitmap
> (od -x, or similar) to figure out approximately how much more he's got
> to resync to get an array in-sync. Other than reading the bitmap file, I
> don't know of any way to determine that.
Read it with O_DIRECT :(
next prev parent reply other threads:[~2006-05-13 15:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-12 6:07 [PATCH 000 of 8] md/bitmap: Introduction - rework management of bitmap files NeilBrown
2006-05-12 6:07 ` [PATCH 001 of 8] md/bitmap: Fix online removal of file-backed bitmaps NeilBrown
2006-05-12 6:07 ` [PATCH 002 of 8] md/bitmap: Remove bitmap writeback daemon NeilBrown
2006-05-12 17:40 ` Andrew Morton
2006-05-13 3:14 ` Neil Brown
2006-05-13 6:59 ` Andrew Morton
2006-05-12 6:07 ` [PATCH 003 of 8] md/bitmap: Cleaner separation of page attribute handlers in md/bitmap NeilBrown
2006-05-12 6:07 ` [PATCH 004 of 8] md/bitmap: Use set_bit etc for bitmap page attributes NeilBrown
2006-05-12 6:07 ` [PATCH 005 of 8] md/bitmap: Remove unnecessary page reference manipulations from md/bitmap code NeilBrown
2006-05-12 6:07 ` [PATCH 006 of 8] md/bitmap: Remove dead code from md/bitmap NeilBrown
2006-05-12 6:08 ` [PATCH 007 of 8] md/bitmap: Tidy up i_writecount handling in md/bitmap NeilBrown
2006-05-12 6:08 ` [PATCH 008 of 8] md/bitmap: Change md/bitmap file handling to use bmap to file blocks NeilBrown
2006-05-12 17:47 ` Andrew Morton
2006-05-13 3:46 ` Neil Brown
2006-05-13 6:59 ` Andrew Morton
2006-05-13 15:29 ` Paul Clements
2006-05-13 15:42 ` Andrew Morton [this message]
2006-05-14 11:15 ` Neil Brown
2006-05-14 11:22 ` Andrew Morton
2006-05-15 0:26 ` Neil Brown
2006-05-15 21:04 ` Andrew Morton
2006-05-15 23:03 ` Neil Brown
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