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On Tue, Jun 23, 2015 at 5:14 AM, Alan McKinnon <alan.mckinnon@×××××.com> wrote: |
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> On 23/06/2015 09:27, Ran Shalit wrote: |
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>> Hello, |
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>> |
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>> I am a beginner with Gentoo. |
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>> I have followed the instruction for the installation, and tried to see |
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>> that I really understand all of them. |
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>> There is the command: |
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>> mount -o bind /dev /mnt/gentoo/dev |
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>> Which I'm not sure I really understand. |
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> |
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> |
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> It's a bind mount, not a regular mount. A regular mount takes a |
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> volume/block device/whatever and mounts it somewhere. |
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> |
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> A bind mount makes a copied mount that is already present on your system |
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> and makes it also available somewhere else. |
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> |
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> You do not want /dev/ and /sys mounted twice - they are core system |
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> directories and bad things can happen if you mount them twice then |
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> change one of them. You get sync issues for one thing. Much much easier |
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> to use bind mounts and potential problems just go away |
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|
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Err... that's not actually true. You can mount as many instances of |
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devtmpfs as you like; they all point to the same memory and contain |
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the same files. Add a file to one and it will appear in all other |
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instances. This is a distinction between tmpfs and devtmpfs. |
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|
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sysfs is even more straightforward; the kernel maintains all of the |
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files in sysfs, so mounting it multiple times is no issue at all. |
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