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无法在 LUKS 下创建 ext4 文件系统

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无法在 LUKS 下创建 ext4 文件系统

我已成功从 32Mb USB 闪存驱动器创建 LUKS 驱动器。但是，当我向其中写入 ext4 文件系统时，我无法安装结果，甚至无法运行fsck等dumpe2fs。

该驱动器显示lsblk为

sda           8:0    1   31M  0 disk
└─luks      253:0    0   15M  0 crypt

然后我用 编写文件系统sudo mkfs.ext4 -v /dev/mapper/luks，它会产生

mke2fs 1.45.5 (07-Jan-2020)
fs_types for mke2fs.conf resolution: 'ext4', 'small'
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
3840 inodes, 3840 blocks
192 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4194304
1 block group
32768 blocks per group, 32768 fragments per group
3840 inodes per group

Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done
各种命令的输出
$ sudo cryptsetup luksDump /dev/sda
LUKS header information
Version:        2
Epoch:          3
Metadata area:  16384 [bytes]
Keyslots area:  16744448 [bytes]
UUID:           1f30e940-4144-4980-a32a-4f1b78a46fc5
Label:          (no label)
Subsystem:      (no subsystem)
Flags:          (no flags)

Data segments:
  0: crypt
        offset: 16777216 [bytes]
        length: (whole device)
        cipher: aes-xts-plain64
        sector: 512 [bytes]

Keyslots:
  0: luks2
        Key:        512 bits
        Priority:   normal
        Cipher:     aes-xts-plain64
        Cipher key: 512 bits
        PBKDF:      argon2i
        Time cost:  4
        Memory:     187471
        Threads:    4
        Salt:       5c c4 28 e0 bc f6 7f df b2 1c 77 b6 fa f3 f1 bc
                    48 66 fc 56 e3 5c e5 13 cc af 1d 52 ec df fc 93
        AF stripes: 4000
        AF hash:    sha256
        Area offset:32768 [bytes]
        Area length:258048 [bytes]
        Digest ID:  0
Tokens:
Digests:
  0: pbkdf2
        Hash:       sha256
        Iterations: 18853
        Salt:       62 8a b7 2c 4d 74 d3 6b 46 c2 9b 34 e2 d6 5c 3d
                    06 12 ee a7 5b b0 81 1f d0 99 19 b6 4f de 5c 77
        Digest:     c2 71 c1 d5 de 16 d9 cc 8c 15 f2 34 21 42 3a a3
                    24 d1 82 26 cd ab f9 98 0c 0a 68 7a 35 e2 3d a9

^Subsystem: (no subsystem)线路令人担忧

$ sudo mount -v /dev/mapper/luks /media/luks
mount: /media/luks: wrong fs type, bad option, bad superblock on /dev/mapper/luks, missing codepage or helper program, or other error.

$ sudo fsck /dev/mapper/luks
fsck from util-linux 2.34
e2fsck 1.45.5 (07-Jan-2020)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/mapper/luks
...

^fsck.ext2向我表明它无法告诉文件系统

$ sudo dumpe2fs /dev/mapper/luks
dumpe2fs 1.45.5 (07-Jan-2020)
dumpe2fs: Bad magic number in super-block while trying to open /dev/mapper/luks
Couldn't find valid filesystem superblock.

所有这些都表明文件系统尚未正确创建，但是据我所知，即使是区区 15Mb 的空间也应该足够了，我不确定还有什么问题

答案1

听起来像是硬件问题。您应该badblocks在设备上以写入模式运行。

另一种选择是

  • 创建一个小图像文件（几百 MiB）
  • 在上面放一个循环装置
  • 在其中创建文件系统
  • 将图像文件复制到设备（的第一部分）
  • 将图像文件与设备的相应部分进行比较
dd if=/dev/zero of=/path/to/imagefile bs=1M count=100

losetup /dev/loop0 /path/to/imagefile

mkfs.ext4 /dev/loop0

blockdev --getsz /dev/loop0
204800

dd if=imagefile of=/dev/mapper/luks

sha1sum imagefile 
aaafc117548aaebef3dbb5f4a609022e386192b6  imagefile

dd if=/dev/mapper/luks count=204800 | sha1sum 
204800+0 Datensätze ein
204800+0 Datensätze aus
aaafc117548aaebef3dbb5f4a609022e386192b6  -

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