[dm-devel] [PATCH 2.6.20] updated dm-loop patch

[devzero at web.de]

hi again, 

just wondering - would it make sense to have dm-loop supporting partitions "out of the box" ?

i gave it a try, but the appropriate ioctls seem to be missing.

Command (m for help): p

Disk /dev/mapper/loop0: 104 MB, 104857600 bytes
255 heads, 63 sectors/track, 12 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

             Device Boot      Start         End      Blocks   Id  System
/dev/mapper/loop0p1               1           6       48163+  83  Linux
/dev/mapper/loop0p2               7          12       48195   83  Linux

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 22: Invalid argument.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.


fdisk providing wrong information here, because removing and re-adding loop0 doesn`t make loop0p1 or loop0p2 appear.

there is some nice script at http://www.ussg.iu.edu/hypermail/linux/kernel/0307.2/0935.html which makes those partitions available by creating additional devices, but i`m just wondering if this could work automa(t|g)ically.

regards
roland




> -----Ursprüngliche Nachricht-----
> Von: "Bryn M. Reeves" <breeves at redhat.com>
> Gesendet: 15.02.07 13:28:24
> An: devzero at web.de
> CC: device-mapper development <dm-devel at redhat.com>
> Betreff: Re: [dm-devel] [PATCH 2.6.20] updated dm-loop patch


> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> devzero at web.de wrote:
> > Hi Bryn, 
> > 
> > with this patch and also with 0.415 i have the following problem when compiling it with stock 2.6.20 :
> > 
> >   Building modules, stage 2.
> >   MODPOST 1 modules
> > WARNING: "invalidate_mapping_pages" [drivers/md/dm-loop.ko] undefined!
> > make[1]: *** [__modpost] Error 1
> > make: *** [modules] Error 2
> > 
> > i found , that this was due to missing 
> > 
> > EXPORT_SYMBOL(invalidate_mapping_pages);
> > 
> > in mm/truncate.c 
> > 
> > i found 
> > http://lkml.org/lkml/2007/1/3/154
> > 
> > it looks that this didn`t go into 2.6.20 and we need at least 2.6.20-git11 ?
> > changelog at http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.20-git11.log telling that it had just had been merged on 10th of february:
> > 
> 
> Hi Roland,
> 
> That's right - I keep my git tree fairly close to upstream, so as soon
> as the patch that deprecated invalidate_inode_pages was merged, I
> converted dm-loop to use invalidate_mapping_pages instead.
> 
> This means that dm-loop will build without warnings on the latest
> kernel.org tree but it does mean that you will need the additional patch
> you referenced if you want to apply it to a plain 2.6.20 kernel.
> 
> Kind regards,
> 
> Bryn.
> 
> 
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