Messages in this thread |  | | | Date | Thu, 29 Dec 2011 12:28:44 +0800 | | From | Wanlong Gao <> | | Subject | Re: Bug in BLKBSZSET/GET ioctl ? |
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On 12/29/2011 12:20 PM, Wu Fengguang wrote:
> On Thu, Dec 29, 2011 at 11:51:45AM +0800, Wanlong Gao wrote: >> Hi all: >> >> This is first reported to *libguestfs*: https://bugzilla.redhat.com/show_bug.cgi?id=624335 >> >> Then, I looked into upstream util-linux and it seems nothing wrong. I'm not convinced that it's a kernel bug. >> >> produce: >> >> --- >> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 >> 4096 >> # ./util-linux/disk-utils/blockdev --setbsz 2048 /dev/sda6 >> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 >> 4096 >> # ./util-linux/disk-utils/blockdev --setbsz 512 /dev/sda6 >> # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 >> 4096 > > I think each blockdev invocation is working on a *new* bdev object.
But the address of *new* bdev is the same? I did printk, and they all returned the same address.
> You'll get consistent results if somehow keep it referenced, for
But isn't it a bug? It seems that the setbsz has no effect?
Thanks, -Wanlong
> example, run a background copy task: > > # cp /dev/sda6 /dev/null & > > # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 > # ./util-linux/disk-utils/blockdev --setbsz 512 /dev/sda6 > # ./util-linux/disk-utils/blockdev --getbsz /dev/sda6 > > Thanks, > Fengguang >
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