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

Pavel Machek
2007-11-01T14:33:09Z

Hi!

> 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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