Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP

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To: Mike Waychison <mikew@...>

Cc: linux-fsdevel <linux-fsdevel@...>, Linux Kernel <linux-kernel@...>

Subject: Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP

Date: Monday, October 29, 2007 - 3:08 pm

Hi!

quoted text> Remove the need for having CAP_SYS_RAWIO when doing a FIBMAP call on an open file descriptor.
> 
> It would be nice to allow users to have permission to see where their data is landing on disk, and there really isn't a good reason to keep them from getting at this information.

I believe it is to prevent users from intentionally creating extremely
fragmented files...

You can read 60MB in a second, but fragmented 60MB file could take
10msec * 60MB/4KB = 150 seconds. That's factor 150 slowdown...

...but I agree that SYS_RAWIO may be wrong capability to cover this.

							Pavel

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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Messages in current thread:

[patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Mike Waychison, (Thu Oct 25, 7:06 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Pavel Machek, (Mon Oct 29, 3:08 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Ric Wheeler, (Thu Nov 1, 10:51 am)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Alan Cox, (Thu Oct 25, 8:22 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Mike Waychison, (Thu Oct 25, 8:35 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Alan Cox, (Thu Oct 25, 8:43 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Jason Uhlenkott, (Fri Oct 26, 5:55 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Mike Waychison, (Fri Oct 26, 5:59 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Jason Uhlenkott, (Fri Oct 26, 6:40 pm)

Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP, Mike Waychison, (Fri Oct 26, 6:53 pm)


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Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP

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