On Tue, 28 Mar 2017 05:27:03 -0400
Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> On Tue, Mar 28, 2017 at 4:01 AM, Ralph Sennhauser
> <ralph.sennhauser@xxxxxxxxx> wrote:
> > Hi Amir
> >
> > Commit d8514d8edb5b ("ovl: copy up regular file using O_TMPFILE")
> > breaks squashfs with an ubifs overlay (both ubi volumes of the same
> > container).
> >
>
> Hi Ralph,
>
> I am confused by the description above. Which are the 'both ubi
> volumes'?
The ubi container has two volumes, the first is a squashfs, the second
volume an ubifs. The latter is mounted as an overlay.
>
> Can you provide exact command of overlayfs mount, preferably
> also a script to generate the lower/upper images and mount them
> to remove any mkfs option doubts from test setup.
Both I mount from the initramfs as follows (rom / overlay are empty in
the initramfs):
mount -o rw,nosuid,nodev,noexec,noatime -t proc proc /proc || rescue_shell "proc"
mount -o rw,nosuid,nodev,noexec,noatime -t sysfs sysfs /sys || rescue_shell "sys"
mount -o rw,nosuid -t devtmpfs devtmpfs /dev || rescue_shell "dev"
ubiattach -m $(get_mtd_from_root_arg) /dev/ubi_ctrl || rescue_shell "attach"
ubiblock --create /dev/ubi0_0 || rescue_shell || "block"
mount -o ro -t squashfs /dev/ubiblock0_0 /rom || rescue_shell "mount rootfs"
mount -o rw,noatime -t ubifs /dev/ubi0_1 /overlay || rescue_shell "mount rootfs_data"
mkdir -p /overlay/upper || rescue_shell "mkdir upper"
mkdir -p /overlay/work || rescue_shell "mkdir work"
mount -o rw,noatime,lowerdir=/rom,upperdir=/overlay/upper,workdir=/overlay/work \
-t overlay overlay /newroot || rescue_shell "mount overlay"
mount --move /rom /newroot/rom || rescue_shell "move rootfs"
mount --move /overlay /newroot/overlay || rescue_shell "move rootfs_data"
mount --move /dev /newroot/dev || rescue_shell "move dev"
mount --move /sys /newroot/sys || rescue_shell "move sys"
mount --move /proc /newroot/proc || rescue_shell "move proc"
exec switch_root /newroot /sbin/init
I use OpenWrt as a basis, replacing the kernel with a vanilla one.
The options used to generate the file systems are:
Squashfs: -p 128KiB -m 2048 -s 512 -O 2048
Ubifs: -m 2048 -e 124KiB -c 4096 -F
>
> > Renaming a file results in an error "UBIFS error (ubi0:1 pid 1394):
> > ubifs_add_orphan: orphaned twice". This corrupts the the filesystem
> > and the next attempt to mount the overlay will fail.
> >
>
> Does that happen on any attempt to rename a file?
> A file that was only is lower I suppose?
That's how I trigger it, yes. Can reproduce it on any attempt.
> Can you provide a simple script with your test, setting up the
> lower/upper files and triggering the bug.
Any more you need than the above mount script? A call to "mv somefile
somefile.back && reboot" on a fresh install is all I do.
Thanks
Ralph
PS: Reverting 01ad3eb8a073 ("ovl: concurrent copy up of regular files")
as a dependency and the commit mentioned in Subject fix the issue for
me. Tested on v4.11-rc4 and next-20170327.
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