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From: Jan Engelhardt <jengelh@computergmbh.de>
To: Chris Mason <chris.mason@oracle.com>
Cc: David Miller <davem@davemloft.net>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	btrfs-devel@oss.oracle.com
Subject: Re: BTRFS partition usage...
Date: Tue, 12 Feb 2008 16:04:52 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802121543240.21102@fbirervta.pbzchgretzou.qr> (raw)
In-Reply-To: <200802120935.20437.chris.mason@oracle.com>

>
On Feb 12 2008 09:35, Chris Mason wrote:
>>
>> and slap the bootloader into "MBR", just like on x86.
>> Or I am missing something..
>
>It was a request from hpa, and he clearly had something in mind.  He kindly 
>offered to review the disk format for bootloaders and other lower level 
>issues but I asked him to wait until I firm it up a bit.
>
>From my point of view, 0 is a bad idea because it is very likely to conflict 
>with other things.  There are lots of things in the FS that need deep 
>thought,and the perfect system to fully use the first 64k of a 1TB filesystem 
>isn't quite at the top of my list right now ;)
>
>Regardless of offset, it is a good idea to mop up previous filesystems where 
>possible, and a very good idea to align things on some sector boundary.  Even 
>going 1MB in wouldn't be a horrible idea to align with erasure blocks on SSD.

I still don't like the idea of btrfs trying to be smarter than a user
who can partition up his system according to
	(a) his likes
	(b) system or hardware requirements or recommendations
to align the superblock to a specific location.

1MB alignment does not always mean 1MB alignment.
Sector 1 begins at 0x7e00 on x86.
And with the maximum CHS geometry (255/63), partitions begin
at 0x7e00+n*8225280 bytes, so the SB is unlikely to ever be on
a 1048576 boundary.

  reply	other threads:[~2008-02-12 15:05 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 17:00 [ANNOUNCE] Btrfs v0.12 released Chris Mason
2008-02-11  1:12 ` David Miller
2008-02-11 13:42   ` Chris Mason
2008-02-12  6:43     ` David Miller
2008-02-12 13:43       ` Chris Mason
2008-02-12  7:21 ` BTRFS partition usage David Miller
2008-02-12  8:11   ` David Miller
2008-02-12 13:49     ` Chris Mason
2008-02-12 14:00       ` Jan Engelhardt
2008-02-12 14:08         ` Chris Mason
2008-02-12 14:21           ` Jan Engelhardt
2008-02-12 14:35             ` Chris Mason
2008-02-12 15:04               ` Jan Engelhardt [this message]
2008-02-12 16:17                 ` Chris Mason
2008-02-12 23:38                 ` David Miller
2008-02-12 23:42                   ` Jan Engelhardt
2008-02-13  1:09                     ` David Miller
2008-02-13  1:22                     ` Rene Herman
2008-02-12 23:35               ` David Miller
2008-02-13  7:02                 ` Christoph Hellwig
2008-02-12 23:34             ` David Miller
2008-02-12 23:33           ` David Miller
2008-02-13  2:10             ` Jeff Garzik
2008-02-14  0:51               ` Szabolcs Szakacsits
2008-02-12 23:26         ` David Miller
2008-02-12 23:39           ` Jan Engelhardt
2008-02-13  1:08             ` David Miller
2008-02-13  1:25           ` Bryan Henderson
2008-02-12 23:28         ` David Miller
2008-02-13  0:45           ` Theodore Tso
2008-02-12 20:50       ` David Miller
2008-02-12  9:23 ` CRC32C big endian bugs David Miller
2008-02-12 21:55 ` BTRFS only works with PAGE_SIZE <= 4K David Miller
2008-02-12 22:03   ` Chris Mason

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