From: Heming Zhao <heming.zhao@suse.com>
To: Zdenek Kabelac <zkabelac@redhat.com>,
LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] confused with lvm2 filter rules
Date: Mon, 10 Jun 2019 02:43:08 +0000 [thread overview]
Message-ID: <448f9dc9-98c0-df99-d527-189bd2aa7a30@suse.com> (raw)
In-Reply-To: <d94cb5bd-b327-89e7-ceba-1f53060d060e@redhat.com>
Hello Zdenek,
I totally got your point. Let's close this session.
Thank you for you reply.
Regards,
zhm
On 6/6/19 9:51 PM, Zdenek Kabelac wrote:
> Dne 06. 06. 19 v 15:30 Heming Zhao napsal(a):
>> Hello,
>>
>> the filter is:
>> filter = [ "r|/dev/.*/by-path/.*|", "r|/dev/.*/by-id/.*|",
>> "r|/dev/fd.*|", "r|/dev/cdrom|", "a/.*/" ]
>>
>> if filter doesn't contain "a/.*/":
>> - pvcreate, vgcreate & vgextend use regex filter to reject the disk.
>> (correct logic)
>> �> if filter contains "a/.*/":
>> - regex fileter pass the disk under pvcreate/vgcreate, create
>> successfully.
>> - regex filter reject the disk under vgextend. (wrong. should create
>> successfuly)
>> - vgextend should do the same action as pvcreate/vgcreate.
>
> Hi
>
> As has been said -�� when you put� a|.*| as the last rule - it's doing
> something different then you may think. So please do NOT test with such
> filter (I've been even planning to add 'WARNING:' message when lvm2
> would spot such filter....)
>
>> log as below (with filter contain: "a/.*/"):
>
> Not really interesting trace - the filter works correctly for this case.
>
> The best advice is - DO NOT USE IT set this way.
>
> Code is correct and there is no bug - it's just non-trivial to
> understand what just filter is doing. Behavior cannot be changed without
> causing regression for other users that set filters correctly.
>
> So do you have any buggy trace for correctly set filter ?
>
> Regards
>
> Zdenek
>
next prev parent reply other threads:[~2019-06-10 2:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 13:03 [linux-lvm] confused with lvm2 filter rules Heming Zhao
2019-06-05 2:41 ` Heming Zhao
2019-06-05 10:20 ` Zdenek Kabelac
2019-06-06 6:42 ` Heming Zhao
2019-06-06 8:16 ` Heming Zhao
2019-06-06 8:43 ` Zdenek Kabelac
2019-06-06 13:30 ` Heming Zhao
2019-06-06 13:51 ` Zdenek Kabelac
2019-06-10 2:43 ` Heming Zhao [this message]
[not found] ` <60982841-fabc-71d9-b8b1-6d98b87ba738@suse.com>
2019-06-25 7:56 ` Martin Wilck
2019-06-25 8:56 ` Zdenek Kabelac
2019-06-25 9:13 ` Heming Zhao
2019-06-26 6:49 ` Heming Zhao
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