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# cd /dtv
# md ly1mnt
# mkfs.xfs -f -d file,name=/dtv/layer1,size=24m
meta-data=/dtv/layer1 isize=256 agcount=1, agsize=6144 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=6144, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=1200, version=2
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
existing superblock read failed: Inappropriate ioctl for device
# mount -o loop layer1 ly1mnt/
# mkfs.xfs -f -d file,name=/dtv/ly1mnt/layer2,size=1536m
meta-data=/dtv/ly1mnt/layer2 isize=256 agcount=4, agsize=98304 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=393216, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=0
realtime =none extsz=4096 blocks=0, rtextents=0
existing superblock read failed: Inappropriate ioctl for device
# md ly2mnt
# mount -o loop ly1mnt/layer2 ly2mnt/
# touch ly2mnt/.PlaceHolderDO-NOT-REMOVE
# ls -alR /dtv/l*
-rw-r--r-- 1 root 0 25165824 Feb 12 21:16 /dtv/layer1
/dtv/ly1mnt:
drwxr-xr-x 2 root 0 19 Feb 12 21:17 .
drwxrwxrwt 6 root 0 440 Feb 12 21:17 ..
-rw-r--r-- 1 root 0 1610612736 Feb 12 21:17 layer2
/dtv/ly2mnt:
drwxr-xr-x 2 root 0 38 Feb 12 21:22 .
drwxrwxrwt 6 root 0 440 Feb 12 21:17 ..
-rw-r--r-- 1 root 0 0 Feb 12 21:22 .PlaceHolderDO-NOT-REMOVE
# df -h
Filesystem Size Used Available Use% Mounted on
/dev/tbml8 3.4M 3.4M 0 100% /
none 10.0M 10.0M 0 100% /dtv
none 10.0M 0 10.0M 0% /dsm
none 230.0M 0 230.0M 0% /core
none 10.0M 0 10.0M 0% /tmp
/dev/stl0/14 24.9M 2.0M 22.9M 8% /mtd_rwarea
/dev/stl0/19 48.5M 48.5M 0 100% /mtd_rocommon
/dev/stl0/17 88.9M 85.3M 3.7M 96% /mtd_exe
/dev/stl0/18 39.9M 39.9M 0 100% /mtd_appdata
/dev/stl0/13 10.7M 130.0k 10.6M 1% /mtd_contents
/dev/stl0/20 100.0M 46.5M 53.5M 46% /mtd_swu
/dev/stl0/21 392.3M 302.9M 89.4M 77% /mtd_rwcommon
/dev/sda1 964.1M 183.9M 780.2M 19% /dtv/usb/sda1
/dev/stl0/14 24.9M 2.0M 22.9M 8% /etc/passwd
/dev/stl0/14 24.9M 2.0M 22.9M 8% /etc/profile
/mtd_rwcommon/SamyGO/pvrntfs.img 31.3M 2.8M 28.5M 9% /mtd_rwcommon/SamyGO/img
/dev/sdb 482.0k 6.0k 476.0k 1% /dtv/usb/sdb
/dev/sdc 250.0G 146.3G 103.7G 59% /dtv/usb/sdc
10.10.10.10:/samrec 250.0G 146.3G 103.7G 59% /dtv/usb/sdb/nfs/10.10.10.10/_samrec
10.10.10.10:/samrec 250.0G 146.3G 103.7G 59% /dtv/usb/sdc
/dev/loop0 19.3M 12.6M 6.7M 65% /dtv/ly1mnt
/dev/loop1 1.5G 8.2M 1.5G 1% /dtv/ly2mnt
#
EDIT: it is
, final results here