On Wed, 2011-02-16 at 05:55 -0500, alice wan wrote:
> option b, c seems simpler and needs less codes for my code
> version(xen4.0.0+2.6.31.13).
Example:
[1]+ tail -f /var/log/daemon.log &
root@vantst07:~# tap-ctl list
7781 0 0 vhd /var/tmp/lenny.vhd
Feb 16 13:04:00 vantst07 tapdisk2[7779]: received 'pid' message (uuid = 0)
Feb 16 13:04:00 vantst07 tapdisk2[7779]: sending 'pid response' message (uuid =
0)
Feb 16 13:04:00 vantst07 tapdisk2[7779]: received 'list' message (uuid = 65535)
Feb 16 13:04:00 vantst07 tapdisk2[7779]: sending 'list response' message (uuid
= 65535)
Feb 16 13:04:00 vantst07 tapdisk2[7779]: sending 'list response' message (uuid
= 65535)
root@vantst07:~# tap-ctl pause -p 7781 -m 0
Feb 16 13:04:12 vantst07 tapdisk2[7779]: received 'pause' message (uuid = 0)
Feb 16 13:04:12 vantst07 tapdisk2[7779]: /var/tmp/lenny.vhd: b: 256, a: 256, f:
140, n: 1050624
Feb 16 13:04:12 vantst07 tapdisk2[7779]: closed image /var/tmp/lenny.vhd (0
users, state: 0x00000000, type: 4)
Feb 16 13:04:12 vantst07 tapdisk2[7779]: sending 'pause response' message (uuid
= 0)
root@vantst07:~# tap-ctl unpause -p 7781 -m 0
Feb 16 13:04:20 vantst07 tapdisk2[7779]: received 'resume' message (uuid = 0)
Feb 16 13:04:20 vantst07 tapdisk2[7779]: /var/tmp/lenny.vhd version: tap
0x00010003, b: 256, a: 256, f: 140, n: 1050624
Feb 16 13:04:20 vantst07 tapdisk2[7779]: opened image /var/tmp/lenny.vhd (1
users, state: 0x00000001, type: 4)
Feb 16 13:04:20 vantst07 tapdisk2[7779]: VBD CHAIN:
Feb 16 13:04:20 vantst07 tapdisk2[7779]: /var/tmp/lenny.vhd: 4
Feb 16 13:04:20 vantst07 tapdisk2[7779]: sending 'resume response' message
(uuid = 0)
> i'm not familiar with blktap code. would you please tell in which
> function blktap run an implicit close/open when process first io?
I think those lines never made it into tools/blktap. XCP's srpm should
still have those patches, but they're already removed post-5.6fp1, so
I'd recommend to rather go for b. and let c. fade out. The toolstack
should stay in control, not the disk to try paper over mistaken
assumptions.
> and in latest stable version blktap2 pause/unpause is available ?
Yup.
Daniel
> thanks
> 2011/2/14 Daniel Stodden <daniel.stodden@xxxxxxxxxx>
> On Sun, 2011-02-13 at 16:11 -0500, Daniel Stodden wrote:
>
> > B. Hack.
> > Let the toolstack issue a tap-ctl pause/unpause cycle
> before resume.
> > This will reopen the image.
> >
> > C. Back then, in the dark ages, blktap did this implicitly.
> > Every
>
>
> *first*
>
> > I/O request after disk create run an implicit close/open
>
> > cycle.
>
> :o)
>
> D
> a
> niel
>
>
>
>
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