From: Gregory (Grisha) Trubetskoy (grisha_at_ispol.com)
Date: Tue 09 Nov 2004 - 18:29:52 GMT
On Tue, 9 Nov 2004, [ISO-8859-1] Bj?rn Steinbrink wrote:
> On Tue, 9 Nov 2004 12:56:32 -0500 (EST)
> "Gregory (Grisha) Trubetskoy" <grisha_at_ispol.com> wrote:
>> On Tue, 9 Nov 2004, [ISO-8859-1] Bj?rn Steinbrink wrote:
>>> On Tue, 9 Nov 2004 12:01:33 -0500 (EST)
>>> "Gregory (Grisha) Trubetskoy" <grisha_at_ispol.com> wrote:
>>> I don't see any reason why it should behave like that, would only
>>> cause trouble. Example: xid 10 is limited to 500MB and has 300MB in
>>> use. xid 0 deletes some 50MB file. Now there are files worth 250MB,
>>> but still the kernel assumes that 300MB are in use.
>> I think this is fine. There is no way for context 0 to up the counter
>> for another context (even chxid won't increment it), by the same token
>> it seems more consistent if there would be no way to decrement it
>>> Where's the sense behind that? You would have to adapt the usage
>>> statistics every now and then.
>> You'll just have to be mindful of this, and make sure to switch into a
>> context when deleting files if you want the counter to be updated. The
>> disk limits are "volatile" anyway (you have to set them upon bootup),
>> so it's not like it is something that is an "unnatended operation" in
>> the first place.
>> The upside of this is that there are no special mount options that
>> make things like backups difficult.
> What about unification? You normally don't want the unified files to
> lower the usage values upon removal of those files, since actually no
> space is freed.
Hmm... haven't thought about this, good point. Well how about this:
The key here is that a file belongs to a context other than 0. The actual
xid doesn't matter.
So perhaps another fs flag would solve this. (As far as I understand there
is no xid flag right now, IATTR_XID is an artifact of whether MS_TAGXID is
If I am in context 0 don't bother with counters.
If I am in context X and removing a file, then:
If the file belongs to a context other than 0:
If I am in context X and creating a file:
Set the xid flag to 1
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