Hi!
When I run blockdev --getss on Xen 2.0 Linux-2.4.29-xenU I get this:
$ blockdev --getss /dev/sda4
-1
Why sectorsize is not 512?
$ blockdev --getsize /dev/sda4
2097152
The size of sda4 is 1 GB, so the sectorsize has to be 512.
xenU sda4 is lvm-volume in dom0.
blockdev on dom0:
$ blockdev --getss /dev/vg0/swap_sda4
512
$ blockdev --getsize /dev/vg0/swap_sda4
2097152
I''m asking this because I''m having problem using
loopback-mounts in xenU
using those sd-devices.. mount/loop calculates the device size two times too
big.. and that of course causes problems when trying to access the
non-existing second-half of the loopback-mounted sda4-device.
-- Pasi Kärkkäinen
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> When I run blockdev --getss on Xen 2.0 Linux-2.4.29-xenU I get this: > > $ blockdev --getss /dev/sda4 > -1I''ll wager that there''s some ioctl we''re failing to implement, and that blockdev doesn''t check its return code. Perhaps someone could add some tracing to blkfront.c to find out which ioctl. Thanks, Ian ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel
Pasi Kärkkäinen
2005-Feb-13 20:55 UTC
Re: [Xen-devel] linux-2.4.29-xenU and blockdev --getss
On Sat, Feb 12, 2005 at 07:37:12PM -0000, Ian Pratt wrote:> > > > When I run blockdev --getss on Xen 2.0 Linux-2.4.29-xenU I get this: > > > > $ blockdev --getss /dev/sda4 > > -1 > > I''ll wager that there''s some ioctl we''re failing to implement, and that blockdev doesn''t check its return code. > > Perhaps someone could add some tracing to blkfront.c to find out which ioctl. >This patch (by Jari Ruusu) seems to fix the problem: --- xen-2.0/linux-2.4.29-xen-sparse/arch/xen/drivers/blkif/frontend/vbd.c.old Fri Feb 4 15:38:31 2005 +++ xen-2.0/linux-2.4.29-xen-sparse/arch/xen/drivers/blkif/frontend/vbd.c Sun Feb 13 19:05:36 2005 @@ -288,7 +288,7 @@ /* Need to skankily setup ''partition'' information */ gd->part[minor].start_sect = 0; gd->part[minor].nr_sects = capacity; - gd->sizes[minor] = capacity; + gd->sizes[minor] = capacity>>(BLOCK_SIZE_BITS-9); gd->flags[minor >> gd->minor_shift] |= GENHD_FL_VIRT_PARTNS; } After applying that patch the loopback-mounted devices have correct size under xenU.. -- Pasi Kärkkäinen ^ . . Linux / - \ Choice.of.the .Next.Generation. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&op=click _______________________________________________ Xen-devel mailing list Xen-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xen-devel