Messages in this thread |  | | | Date | Sun, 15 Feb 2004 22:21:52 -0800 | | From | jw schultz <> | | Subject | Re: JFS default behavior |
| |
On Mon, Feb 16, 2004 at 12:03:03AM +0100, Nicolas Mailhot wrote: > | Linus Torvalds pointed the way of Tux : > > | In short: the kernel talks bytestreams, and that implies that if you > | want to talk to the kernel, you HAVE TO USE UTF-8. > > In that case : > - should the kernel allow apps to write filenames that are invalid > UTF-8 and will crash UTF-8 apps ?
Yes. The kernel interface specifies it as a bytesteam with 0x00 and 0x2f having special meaning. That is a constraint, not a policy. It is user space that determines the policy of UTF-8.
> UTF-8 and will crash UTF-8 apps ?
Fix the broken apps. Crashing because of "invalid" UTF-8 is no more excusable than crashing because of a string longer than expected (buffer overrun). Filenames as read from the filesystem should be treated just like any other untrusted input.
> - should this UTF-8 rule be noted somewhere (in a FAQ/man page/LSB spec/ > whatever) so apps authors know they are supposed to read and write UTF-8 > filenames and not apply locale rules to kernel objects ?
Since the LSB spec describes user space it might be a suitable place.
> - what happens to already existing invalid UTF-8 filenames ? Should the > kernel forcibly rewrite them (in 2.7.0...) to remove legacy mess ? What
If you have a filesystem with filenames that don't conform to your policy write userspace tools to detect and/or fix them. If you have programs creating non-conforming filenames, fix or rm those programs.
> kernel forcibly rewrite them (in 2.7.0...) to remove legacy mess ? What > should happen if someone plug an unconverted FS in such a system > afterwards ?
The kernel won't care. Any user space code that treats the filenames as something other than bytestreams should be able to cope with any sequence of bytes.
> These are the questions people have been asking.
OK. The questions have been asked and answered. Asking again and again and again won't change the answer.
-- ________________________________________________________________ J.W. Schultz Pegasystems Technologies email address: jw@pegasys.ws Remember Cernan and Schmitt - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |