ioctl compatibility

ioctl compatibility

[Noah Watkins]

Hi Greg,

I noticed this patch changed the CEPH_IOCTL_MAGIC to 0x98, and is also synchronized with the user space Ceph tree, but the Ceph client that ships with Ubuntu 10.10 uses 0x97. There wasn't a change made by this patch to Documentation/ioctl/ioctl-numbers.txt, so I was curious if this was an oversight, and if not, how the userspace code could be made to adapt for the kernel shipping with 10.10.

Thanks,
Noah


--- a/fs/ceph/ioctl.h
+++ b/fs/ceph/ioctl.h
@@ -4,7 +4,7 @@
 #include <linux/ioctl.h>
 #include <linux/types.h>
 
-#define CEPH_IOCTL_MAGIC 0x97
+#define CEPH_IOCTL_MAGIC 0x98
 
 /* just use u64 to align sanely on all archs */
 struct ceph_ioctl_layout {
@@ -17,6 +17,8 @@ struct ceph_ioctl_layout {
                                   struct ceph_ioctl_layout)
 #define CEPH_IOC_SET_LAYOUT _IOW(CEPH_IOCTL_MAGIC, 2,          \
                                   struct ceph_ioctl_layout)
+#define CEPH_IOC_SET_LAYOUT_POLICY _IOW(CEPH_IOCTL_MAGIC, 5,   \
+                                  struct ceph_ioctl_layout)
 
 /*
  * Extract identity, address of the OSD and object storing a given

Re: ioctl compatibility

[Gregory Farnum]

On Sat, Dec 4, 2010 at 3:17 PM, Noah Watkins <jayhawk@cs.ucsc.edu> wrote:
> Hi Greg,
>
> I noticed this patch changed the CEPH_IOCTL_MAGIC to 0x98, and is also synchronized with the user space Ceph tree, but the Ceph client that ships with Ubuntu 10.10 uses 0x97. There wasn't a change made by this patch to Documentation/ioctl/ioctl-numbers.txt, so I was curious if this was an oversight, and if not, how the userspace code could be made to adapt for the kernel shipping with 10.10.
Oh, wow. This was an inappropriate change which we're reverting now
and will make sure gets pushed upstream.
Thanks for noticing! :)
-Greg

QEMU RBD failed!

[wchen]

Hi Farnum,

I follow the instructions on wiki to create a qemu image using qemu rbd,
but failed.

According to wiki, after compiled qemu and input the following command:
$ qemu-img create -f rbd rbd:data/foo 10G

But system tell me that "unknown format 'rbd'".
which step did I miss? how to register a 'rbd' format?
BTW, I run these commands on ceph cluster.

Thanks a lot!

-- 
best regards,
Kevin Chen (陈巍)

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Re: QEMU RBD failed!

[Wido den Hollander]

Hi Kevin,

On Thu, 2011-01-27 at 17:48 +0800, wchen wrote:
> Hi Farnum,
> 
> I follow the instructions on wiki to create a qemu image using qemu rbd,
> but failed.
> 
> According to wiki, after compiled qemu and input the following command:
> $ qemu-img create -f rbd rbd:data/foo 10G
> 
> But system tell me that "unknown format 'rbd'".

Seems you are missing RBD support in Qemu.

> which step did I miss? how to register a 'rbd' format?
> BTW, I run these commands on ceph cluster.

Did you compile Qemu-RBD with --enable-rbd ?

And are you sure you are running the correct binary and that there is no
old Qemu installation on your system.

Wido