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Re: 1.4.18 problem with counting?

From: Pixel
Subject: Re: 1.4.18 problem with counting?
Date: 27 Sep 2001 14:02:04 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.0.104

Andrew Clausen <address@hidden> writes:

> Did you reboot?  Parted will often display a rant about not doing anything
> with modified partitions before rebooting... 

About this reboot needed restriction (BLKRRPART), there is a linux 2.4
extension that get rid of it:

> This BLKPG_ADD_PARTITION stuff is rather powerful. You can add and delete
> partitions on the fly. No kernel parsing partition tables is needed, userspace
> tells the kernel where the partition starts, how large it is, what labels it
> has.

It works quite nicely (I only use it in diskdrake for adding partitions), but
doesn't get along nicely with devfs.

Here is an example of use (XS code easily translatable in pure C)
add_partition(hd, start_sector, size_sector, part_number)
  int hd
  unsigned long start_sector
  unsigned long size_sector
  int part_number
    long long start = start_sector * 512;
    long long size = size_sector * 512;
    struct blkpg_partition p = { start, size, part_number, "", "" };
    struct blkpg_ioctl_arg s = { BLKPG_ADD_PARTITION, 0, sizeof(struct 
blkpg_partition), (void *) &p };
    RETVAL = ioctl(hd, BLKPG, &s) == 0;

cu Pixel.

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