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To: Bruce Ashfield <bruce.ashfield@windriver.com>
References: <56FCF6E3.7090109@windriver.com>
From: Hongxu Jia <hongxu.jia@windriver.com>
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Date: Thu, 31 Mar 2016 18:31:16 +0800
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Subject: Re: aufs missing in kernel 4.4
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On 03/31/2016 06:07 PM, Hongxu Jia wrote:
> Hi Bruce,
>
> In kernel 4.1, it supports aufs:
> http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-4.1/tree/fs/aufs?h=standard/base 
>
>
> But it does not exist in kernel 4.4:
> http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-4.4/tree/fs?h=standard/base 
>
>
> It caused ISO's rootfs is readonly.
>
> In meta/recipes-core/initrdscripts/files/init-live.sh:
> -----------------
> 174     elif grep -q -w "aufs" /proc/filesystems; then
> 175         union_fs_type="aufs"
> [snip]
> 204         "aufs")
> 205             mkdir -p /rootfs.ro /rootfs.rw
> 206             if ! mount -n --move $ROOT_MOUNT /rootfs.ro; then
> 207                 rm -rf /rootfs.ro /rootfs.rw
> 208                 fatal "Could not move rootfs mount point"
> 209             else
> 210                 mount -t tmpfs -o rw,noatime,mode=755 tmpfs 
> /rootfs.rw
> 211                 mount -t aufs -o 
> "dirs=/rootfs.rw=rw:/rootfs.ro=ro" aufs $ROOT_MOUNT
> 212                 mkdir -p $ROOT_MOUNT/rootfs.ro $ROOT_MOUNT/rootfs.rw
> 213                 mount --move /rootfs.ro $ROOT_MOUNT/rootfs.ro
> 214                 mount --move /rootfs.rw $ROOT_MOUNT/rootfs.rw
> 215             fi
> 216             ;;
> -----------------
>
> Would you please update kernel 4.4 to support aufs?

Or with Robert's patch in mailing list also could fix this issue.

[OE-core] [PATCH 1/1] linux-yocto 4.4: enable overlayfs

//Hongxu

>
> //Hongxu
>