Messages in this thread | | | Date | Fri, 02 May 2008 07:32:24 -0400 | From | Dan Noé <> | 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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Andrew Morton wrote: >> |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
Hmmm. The thing you are doing differently is that the reporter's root filesystem is mounted read only but in your case (and the quick try I had at it) the read only file system is mounted below root.
However, I tried reproducing that scenario with a chroot and I still couldn't get it to happen. No time to try a real root mount ro this morning but perhaps others can.
Cheers, Dan
-- /--------------- - - - - - - | Dan Noé | http://isomerica.net/~dpn/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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