Messages in this thread | | | Date | Thu, 1 May 2008 21:52:31 -0700 | From | Andrew Morton <> | Subject | Re: linux-2.6.25: 'mkdir -p' does not work with rootdir as mount point inside a read only filesystem |
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On Wed, 30 Apr 2008 16:50:20 +0200 Lothar Wa__mann <LW@KARO-electronics.de> wrote:
> Hi,
(y'know that ~4000 people read your email and hit 'n'? Except for me? That's one bug I'd like to get fixed)
> when trying to create a directory path with 'mkdir -p' with the root > being a mount point of a writeable filesystem that exists inside a > read-only file system, mkdir return -EROFS. > > This was tested with the latest git-tree from: > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 > > The last kernel I know of this has been working was 2.6.22. > > E.g.: > |root@triton1:/# mount > |rootfs on / type rootfs (rw) > |/dev/root on / type jffs2 (ro) > |proc on /proc type proc (rw) > |sysfs on /sys type sysfs (rw) > |/dev/root on /dev/.static/dev type jffs2 (ro) > |tmpfs on /dev type tmpfs (rw,size=10240k,mode=755) > |tmpfs on /var type tmpfs (rw) > |tmpfs on /tmp type tmpfs (rw) > |devpts on /dev/pts type devpts (rw,gid=5,mode=620) > |tmpfs on /dev/shm type tmpfs (rw) > |root@triton1:/# mkdir -p /dev/.udev/db > |mkdir: Cannot create directory `/dev/': Read-only file system > > While: > |root@triton1:/# cd /dev > |root@triton1:/# mkdir -p .udev/db > works as expected... > > Has anyone else encountered this problem already? > I've searched the archives but could not find anything related to this > problem.
I had a shot at scripting this, but for me, everything works OK.
#!/bin/sh dd if=/dev/zero of=file1 bs=1M count=32 dd if=/dev/zero of=file2 bs=1M count=32 yes | mkfs -t ext2 file1 yes | mkfs -t ext2 file2 mkdir -p mountpoint mount -o loop file1 mountpoint mkdir mountpoint/dir umount mountpoint mount -o loop,ro file1 mountpoint mount -o loop file2 mountpoint/dir mkdir -p $(/bin/pwd)/mountpoint/dir/subdir
are you able to modify the above so that it demonstrates the failure?
Thanks.
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