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From: Rene Herman <rene.herman@keyaccess.nl>
To: Jan Engelhardt <jengelh@computergmbh.de>
Cc: David Miller <davem@davemloft.net>,
	chris.mason@oracle.com, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, btrfs-devel@oss.oracle.com
Subject: Re: BTRFS partition usage...
Date: Wed, 13 Feb 2008 02:22:43 +0100	[thread overview]
Message-ID: <47B24663.4070101@keyaccess.nl> (raw)
In-Reply-To: <Pine.LNX.4.64.0802130040350.14275@fbirervta.pbzchgretzou.qr>

On 13-02-08 00:42, Jan Engelhardt wrote:

> x86 MSDOS partition table layout starts counting with sector 1, which is
> (not so intuitively) starting at 0x7e00 (and there's no sector 0, 
> probably for safety). Well, each ptable format with its own quirks.

I haven't followed this thread, but in case it matters -- this sounds fairly 
confused.

Not sure what you're saying, but the MSDOS partition table has its root 
table in the very first sector on the disk, at offset 0x1be = 0x200 - 4 * 
sizeof(struct partition) - 2 (that is, 4 entries at the end of that first 
sector, followed by a 2-byte signature).

That 0x7e00 that you are speaking of sounds somewhat like the _memory_ 
address the BIOS loads that first sector to: 0x7c00. It then jumps there to 
start the ball rolling but 0x7c00 is not an on-disk reality or anything.

MS-DOS partition tables are furthermore fully outside the actual partitions 
themselves and as such I believe not all together relevant to the issue? (as 
said, not following along though...)

Rene

  parent reply	other threads:[~2008-02-13  1:21 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
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 [this message]
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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