From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: mdadm: ioctl(GET_DISK_INFO) question
Date: Sat, 28 Apr 2012 08:09:11 +1000
Message-ID: <20120428080911.10fe2f47@notabene.brown>
References: <CAGRgLy4p0aiZD92dJsV3tdcZyPaJ=8Nc6CKWVcQU20QtMb6MBQ@mail.gmail.com>
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To: Alexander Lyakas <alex.bolshoy@gmail.com>
Cc: linux-raid <linux-raid@vger.kernel.org>
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On Fri, 27 Apr 2012 17:14:28 +0300 Alexander Lyakas <alex.bolshoy@gmail.com>
wrote:

> Hello,
>=20
> what is the reason that in some places (like Detail()), the code tests
> for all desc_nrs possible (value read from superblock or MaxDisks
> macro):
> for (d =3D 0; d < max_disks; d++) {
>     disc.number =3D d;
>     ioctl(fd, GET_DISK_INFO, &disk)
>=20
> and in other places (like Monitor()), the loop goes only up to :
> array.raid_disks + array.nr_disks.

Bug.

>=20
> After all, disk.number (which is rdev->desc_nr in kernel) is merely a
> position of the disk entry in the dev_roles[] array in the superblock,
> and has no relation to the raid slot of the disk. Shouldn't the code
> always check max_disks possible?

Yes.

Thanks,
NeilBrown


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