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Date: Tue, 15 Jan 2008 17:43:05 +0100 (CET)
From: Jan Engelhardt <jengelh@computergmbh.de>
To: "Robert P. J. Day" <rpjday@crashcourse.ca>
cc: =?ISO-8859-15?Q?Dagfinn_Ilmari_Manns=E5ker?= <ilmari@ilmari.org>,
       Gene Heskett <gene.heskett@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: Possibly silly Q?
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On Jan 14 2008 15:53, Robert P. J. Day wrote:
>>
>> fdisk or similar should have issued an ioctl to reread the partition
>> table after writing the new one, but you can do it manually with
>> 'blockdev --rereadpt <device>'.
>
>i remember bringing up this very issue quite some time ago and, IIRC,
>the consensus was that *primary* partition changes would be re-read by
>the kernel, but not *logical* partition changes.  or something sort of
>like that.

Nah, it dumps the whole partition structure.
Note in fs/partition/check.c:rescan_partitions:

	for (p = 1; p < disk->minors; p++)
		delete_partition(disk, p);
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