Messages in this thread | | | Date | Mon, 29 Oct 2007 19:08:13 +0000 | From | Pavel Machek <> | Subject | Re: [patch 1/1] Drop CAP_SYS_RAWIO requirement for FIBMAP |
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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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