Mount
# losetup -v -f sample.img
Loop device is /dev/loop0
# kpartx -v -a sample.img
add map loop0p1 (252:2): 0 983040 linear /dev/loop0 24576
add map loop0p2 (252:3): 0 266240 linear /dev/loop0 1007616
add map loop0p3 (252:4): 0 40960 linear /dev/loop0 1273856
add map loop0p4 (252:5): 0 2097152 linear /dev/loop0 1314816
# mount /dev/mapper/loop0p1 rootfs
# mount /dev/mapper/loop0p2 appfs
# mount /dev/mapper/loop0p3 cfgfs
# mount /dev/mapper/loop0p4 otherfs
Unmount
# kpartx -v -d /dev/loop0
del devmap : loop0p4
del devmap : loop0p3
del devmap : loop0p2
del devmap : loop0p1
# losetup -d /dev/loop0
如果想要查看File Type，可以使用file -s查看(感謝Lucas的告知)
$ sudo file -s /dev/dm-*
/dev/dm-0: DOS/MBR boot sector, code offset 0x3c+2, OEM-ID "mkfs.fat", sectors/cluster 4, reserved sectors 4, root entries 512, Media descriptor 0xf8, sectors/FAT 128, sectors/track 32, heads 64, sectors 131072 (volumes > 32 MB), serial number 0x41f6aa55, unlabeled, FAT (16 bit)
/dev/dm-1: Linux rev 1.0 ext2 filesystem data, UUID=8895657a-58c3-41b3-b7fa-2d023e87b05d (large files)
/dev/dm-2: Linux rev 1.0 ext3 filesystem data, UUID=8cc4a911-c84a-405f-a866-ebd2be7ec56e (large files)
/dev/dm-3: Linux/i386 swap file (new style), version 1 (4K pages), size 16127 pages, no label, UUID=83554e44-f124-44e2-8b01-7e4a07406f41