Messages in this thread | | | Date | Thu, 23 Feb 2006 13:56:39 +0000 | From | Alasdair G Kergon <> | Subject | Re: [dm-devel] Re: [PATCH] User-configurable HDIO_GETGEO for dm volumes |
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On Wed, Feb 22, 2006 at 04:46:57PM -0800, Darrick J. Wong wrote: > Looks good and tests ok, with one issue: I still have a preference for > returning -ENOTTY over 0/0/0 when dm doesn't know the geometry. That > said, most programs will see the zero cylinder count and make a guess, > so it probably doesn't matter.
My copy of the sd(4) man page says of that ioctl:
The information returned in the parameter is the disk geometry of the drive as understood by DOS! This geometry is not the physical geometry of the drive. It is used when constructing the drive's partition table, however, and is needed for convenient operation of fdisk(1), efdisk(1), and lilo(1). If the geometry information is not available, zero will be returned for all of the parameters.
Is there a preferred alternative specification?
Alasdair -- agk@redhat.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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