linux-kernel - change partition table on live disk (resize root partition)

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Message-ID: <1293528249.8310.8.camel@vase>
Date:	Tue, 28 Dec 2010 12:24:09 +0300
From:	Vasiliy G Tolstov <v.tolstov@...fip.ru>
To:	linux-kernel@...r.kernel.org
Subject: change partition table on live disk (resize root partition)

Hello.

If i need to resize root partition on live file system i do
fdisk /dev/sda delete old partition table and write new. After that
fdisk say's that system use old partition table before reread it via
partprobe or something else.

But if i modify root partition partprobe say's that it is already in use
and i need to reboot system to see changes and do resize fs.

Is that possible to reread partition table for root fs without
rebooting? I ca'n use lvm on something else, i'm use plain ext3 fs.

P.S. This is need for xen domU, i see that in blkfront_connect function
this code:

                /*
                 * Potentially, the back-end may be signalling
                 * a capacity change; update the capacity.
                 */
                err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
                                   "sectors", "%Lu", &sectors);
                if (XENBUS_EXIST_ERR(err))
                        return;
                printk(KERN_INFO "Setting capacity to %Lu\n",
                       sectors);
                set_capacity(info->gd, sectors);
                revalidate_disk(info->gd);

If i'm add after revalidate disk some function to reread partiotion
table does it can work?

Sorry for may be stupid question...

-- 
Vasiliy G Tolstov <v.tolstov@...fip.ru>
Selfip.Ru

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