解决挂载img文件时mount: you must specify the filesystem type
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gem5 full systerm时，经常需要在文件系统中，添加文件。但是mount过程经常遇到错误：mount: you must specify the filesystem type
以下是正常挂载流程：
1. # sudo fdisk -lu BigDataBench-gem5.img
You must set cylinders.
You can do this from the extra functions menu.
Disk BigDataBench-gem5.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005536d
Device Boot Start End Blocks Id System
BigDataBench-gem5.img1 32 9751454 4875711+ 83 Linux
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(0, 1, 1) logical=(0, 0, 33)
从上面能看出起始扇区位置32*512
2. sudo mount -t auto -o loop,offset=$((32*512)) BigDataBench-gem5.img tempdir
不要忘记加-t auto
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