从Linux上的C程序直接访问硬盘而无需FS [英] Direct access to hard disk with no FS from C program on Linux

问题描述

我想直接从C程序访问整个硬盘.上面没有FS，永远也不会成为一个.

I want to access the whole hard disk directly from a C program. There's no FS on it and never's gonna be one.

我只想打开/dev/sda(例如)并在磁盘的块/扇区级别上执行I/O.

I just want to open /dev/sda (for example) and do I/O at the block/sector level of the disk.

我打算编写一些程序来学习Linux环境中的C编程(我知道C语言，Python，Perl和Java)，但是对Linux环境缺乏信心.

I'm planning to write some programs for learning C programming in the Linux environment (I know C language, Python, Perl and Java) but lack confidence with the Linux environment.

出于学习目的，我正在考虑使用kyoto-cabinet，并将与计算得出的哈希对应的值直接保存到硬盘的块/扇区"中，记录该对:哈希，块/扇区参考" "放入京都橱柜哈希数据库文件.

For my learning purposes I'm thinking about playing with kyoto-cabinet and saving the value corresponding to the computed hash directly into a "block/sector" of the hard disk, recording the pair: "hash, block/sector reference" into a kyoto-cabinet hash database file.

我不知道使用标准C I/O函数是否可行，否则我不得不编写设备驱动程序"或类似的内容...

I don't know if this is feasible using standard C I/O functions or otherwise I'd have to write a "device driver" or something like...

推荐答案

如在其他地方提到的，在* NIX系统下，像/dev/sda这样的块设备可以作为纯文件访问.请注意，如果从设备挂载了文件系统，则将其作为用于写入的文件打开将失败.

As mentioned elsewhere, under *NIX systems, block devices like /dev/sda can be accessed as plain files. Note that if file system is mounted from the device, opening it as file for writing would fail.

如果您想使用块设备，我建议您首先使用 loop device ，将普通文件显示为块设备.例如:

If you want to play with block devices, I would advise to first use the loop device, which presents a plain file as a block device. For example:

dd if=/dev/zero of=./loop_file_10MB bs=1024 count=10K
losetup /dev/loop0 $PWD/loop_file_10MB

此后，/dev/loop0的行为就好像它是一个块设备一样，但是所有写入的信息都将存储在文件中.

After that, /dev/loop0 would behave as if it was a block device, but all information written would be stored in the file.

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