Re: [9fans] plan9port venti FreeBSD

Re: [9fans] plan9port venti FreeBSD

[Serge Gagnon]

Le 20 Décembre 2005 23:21, Bakul Shah a écrit :
> There is no special magic number for venti.  Just give it a
> normal file or a freebsd partition (/dev/ad0s1e etc) or a
> slice (/dev/ad0s2 etc.)  I suggest you use normal files
> while playing with venti.

Hello,
i tried it with normal files and it begins to work.

I got this error with yesterday
; yesterday -d /COPYRIGHT
diff -c /dump/quenix1/2005/1222/COPYRIGHT /COPYRIGHT
diff: /dump/quenix1/2005/1222/COPYRIGHT: Input/output error
[status 1]
;  
with this message on the terminal where i start venti and vnfs:
% err 0: read too small: asked for 128 need at least 300
cannot open venti disk b8ab9f305bd8b1b7b5e7c18186e7336a94107e2c: read too 
small: asked for 128 need at least 300

I don't know what exactly it means.

For information, i made my setup like this:
create arenas and index:
$ dd if=/dev/zero of=arenas0 seek=$((1024 * 1024 * 512 - 1)) bs=1 count=1
1+0 records in
1+0 records out
1 bytes transferred in 0.000109 secs (9178 bytes/sec)

$ dd if=/dev/zero of=isect0 seek=$((1024 * 1024 * 24 - 1)) bs=1 count=1
1+0 records in
1+0 records out
1 bytes transferred in 0.000095 secs (10538 bytes/sec)

; 9 rc
% venti/fmtisect -b 32k isect0. isect0
part isect0: file isect0 offset 0 size 25,165,824
fmtisect isect0: 743 buckets of 862 entries, 524,288 bytes for index map
% venti/fmtarenas -b 32k arenas0. arenas0
part arenas0: file arenas0 offset 0 size 536,870,912
fmtarenas arenas0: 1 arenas, 536,051,712 bytes storage, 524,288 bytes for 
index map

(I tried it with -b 16k the first time. It was just to see the difference)

% cat venti.conf
index main
isect /home/serge/isect0
arenas /home/serge/arenas0

% venti/fmtindex venti.conf
part venti.conf: file venti.conf offset 0 size 92
part /home/serge/isect0: file /home/serge/isect0 offset 0 size 25,165,824
part /home/serge/arenas0: file /home/serge/arenas0 offset 0 size 536,870,912
fmtindex: 1 arenas, 743 index buckets, 535,986,176 bytes storage

And start venti:
% venti/venti -c venti.conf -h tcp!localhost!8888
venti: conf...part venti.conf: file venti.conf offset 0 size 92
part /home/serge/isect0: file /home/serge/isect0 offset 0 size 25,165,824
part /home/serge/arenas0: file /home/serge/arenas0 offset 0 size 536,870,912
httpd tcp!localhost!8888...init...sync...announce tcp!*!venti...serving.

(it is very fun to play with this ;)

Ok, now i have backuped something:
; sudo vbackup /dev/ad1s2a
Password:
offset of magic: 1372
ffs magic 0x12253e51
offset of magic: 1372
ffs magic 0x19540119
mount /quenix1/2005/1222 ffs:b8ab9f305bd8b1b7b5e7c18186e7336a94107e2c 
2005/1222/1222
# 2005/1222 12:22:23.491 /dev/ad1s2a 
ffs:b8ab9f305bd8b1b7b5e7c18186e7336a94107e2c

It is my / partition

And now I started vnfs:
cat config
mount /quenix1/2005/1222 ffs:b8ab9f305bd8b1b7b5e7c18186e7336a94107e2c 
2005/1222/1222
% sudo vnfs -b 32k -c 1k config
Password:
handle da39a3ee5e6b4b0d

and mount it:
; - vmount
sudo vmount localhost /dump

This is where i got a little problem:
; yesterday /COPYRIGHT
/dump/quenix1/2005/1222/COPYRIGHT
; yesterday -d /COPYRIGHT
diff -c /dump/quenix1/2005/1222/COPYRIGHT /COPYRIGHT
diff: /dump/quenix1/2005/1222/COPYRIGHT: Input/output error
[status 1]
;  

Sorry for my very beginner question...

regards,
-- 
GAGNON serge <serge.gagnon@b2b2c.ca>
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Re: [9fans] plan9port venti FreeBSD

[Russ Cox]

Try running vnfs with -b 32768 instead of -b32k.
I think there was a bug at one point, perhaps not yet
fixed, where it didn't parse the -b suffixes.

Russ

Re: [9fans] plan9port venti FreeBSD

[Serge Gagnon]

Le 22 Décembre 2005 14:04, Russ Cox a écrit :
> Try running vnfs with -b 32768 instead of -b32k.
> I think there was a bug at one point, perhaps not yet
> fixed, where it didn't parse the -b suffixes.

It works!!! Its magic ;)
I had to change -c 1k to -c 1024 because i got an error like 'no cache...' 
before xorg begun to be completely frozen and reboot. So i thought that 'no 
cache' and the -c was the same.

Now it works and i'm very happy.
; yesterday -d /COPYRIGHT
diff -c /dump/quenix1/2005/1222/COPYRIGHT /COPYRIGHT
*** /dump/quenix1/2005/1222/COPYRIGHT   Wed Dec 21 23:17:18 2005
--- /COPYRIGHT  Thu Dec 22 14:57:05 2005
***************
*** 1,6 ****
  # $FreeBSD: src/COPYRIGHT,v 1.6 2005/01/01 07:29:19 sobomax Exp $
  #     @(#)COPYRIGHT   8.2 (Berkeley) 3/21/94
- # it is a test

  The compilation of software known as FreeBSD is distributed under the
  following terms:
--- 1,5 ----

I have one or two other questions about venti, but i'll re-read the man page 
again and familiarize with venti before to ask these questions.

Thanks a lot.

-- 
GAGNON serge <serge.gagnon@b2b2c.ca>
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Re: [9fans] plan9port venti FreeBSD

[Russ Cox]

> i wonder how many years it will be before the unix clones undo that
> aspect of the original design that could do with a change?
> you might have thought that devfs would fix it, but no,
> and furthermore, there's still mknod, `to recover deleted device entries'.

I had hopes for Linux, but they seem to have implemented
devfs poorly and then from that experience decided it wasn't
the right way to go after all.

Of course, then there's the fact that plain stat /dev/ad0 doesn't
give you a reasonable size to begin with.

I was partitioning some disks yesterday, and it was much less
frustrating to port Plan 9's fdisk than to use FreeBSD's.

As for the actual topic of this message, I added 4 to the list
of major device numbers but that didn't completely solve
the problem.  Some disks still showed up as having zero size,
presumably because they were unlabeled, and the code uses
the FreeBSD disk label info to determine partition sizes.
If anyone knows how to get the raw disk size out some other
way, I'd be interested to hear about it.

Russ

Re: [9fans] plan9port venti FreeBSD

[C H Forsyth]

>>It seems that the major device number have change from FreeBSD 4.X to

i wonder how many years it will be before the unix clones undo that
aspect of the original design that could do with a change?
you might have thought that devfs would fix it, but no,
and furthermore, there's still mknod, `to recover deleted device entries'.

Re: [9fans] plan9port venti FreeBSD

[Serge Gagnon]

On Fri, 30 Dec 2005 14:40:53 -0500
Russ Cox <rsc@swtch.com> wrote:

> > I can't run fmtisect or fmtarenas directly on partition without this
> > error:
> >
> > ; sudo /usr/local/plan9/bin/venti/fmtarenas -b 8192
> > arenas0. /dev/ad2:0-10G
> > err 0: can't determine size of
> > partition /dev/ad2 /usr/local/plan9/bin/venti/fmtarenas: can't open
> > partition /dev/ad2:0-10G: can't determine size of partition /dev/ad2
> > [status 1] ;
> 
> ls -l /dev/ad2 and look at the major device number.
> There is a list in src/lib9/_p9dir.c and maybe it is missing.

It seems that the major device number have change from FreeBSD 4.X to
5.X and from 5.X to 6.X . read devfs(5) and mknod(8) in the FreeBSD man.

I tried it on FreeBSD 5.4 with this modification:

#if defined(__FreeBSD__) || defined(__OpenBSD__)
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#if (__FreeBSD_version < 500000) || defined(__OpenBSD__)
static int diskdev[] = {
	151,	/* aacd */
	116,	/* ad */
	157,	/* ar */
	118,	/* afd */
	133,	/* amrd */
	13,	/* da */
	102,	/* fla */
	109,	/* idad */
	95,	/* md */
	131,	/* mlxd */
	168,	/* pst */
	147,	/* twed */
	43,	/* vn */
	3,	/* wd */
	87,	/* wfd */
};
#endif
#if (__FreeBSD_version  >= 500000) && (__FreeBSD_version < 600000)
static int diskdev[] = {
	151,	/* aacd */
	4,	/* ad */
	157,	/* ar */
	118,	/* afd */
	133,	/* amrd */
	13,	/* da */
	102,	/* fla */
	109,	/* idad */
	95,	/* md */
	131,	/* mlxd */
	168,	/* pst */
	147,	/* twed */
	43,	/* vn */
	3,	/* wd */
	87,	/* wfd */
};
#endif
#if (__FreeBSD_version >= 600000)
static int diskdev[] = {
	151,	/* aacd */
	0,	/* ad */
	157,	/* ar */
	118,	/* afd */
	133,	/* amrd */
	13,	/* da */
	102,	/* fla */
	109,	/* idad */
	95,	/* md */
	131,	/* mlxd */
	168,	/* pst */
	147,	/* twed */
	43,	/* vn */
	3,	/* wd */
	87,	/* wfd */
};
#endif

I also made a little modification of isdisk(struct stat *st) just to
see what happened:

; -
sudo /usr/local/plan9/bin/venti/fmtarenas -b 8192 arenas0. /dev/ad2:0-10

diskdev[0] = 151
dev = 4
No Match: diskdev[0] != dev

diskdev[1] = 4
dev = 4
Match: diskdev[1] == dev
Return 1

err 0: can't determine size of partition /dev/ad2
/usr/local/plan9/bin/venti/fmtarenas: can't open
partition /dev/ad2:0-10: can't determine size of partition /dev/ad2
[status 1] 
; 

I have just change the value of "ad" for FreeBSD 5 and 6 because i
don't know where i should find these value for the other device.

-- 
GAGNON serge <serge.gagnon@b2b2c.ca>
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Re: [9fans] plan9port venti FreeBSD

[Russ Cox]

> I can't run fmtisect or fmtarenas directly on partition without this
> error:
>
> ; sudo /usr/local/plan9/bin/venti/fmtarenas -b 8192
> arenas0. /dev/ad2:0-10G
> err 0: can't determine size of
> partition /dev/ad2 /usr/local/plan9/bin/venti/fmtarenas: can't open
> partition /dev/ad2:0-10G: can't determine size of partition /dev/ad2
> [status 1] ;

ls -l /dev/ad2 and look at the major device number.
There is a list in src/lib9/_p9dir.c and maybe it is missing.

> Another question (the last):
> Is there a built-in mechanism to feed the vnfs's config file or should
> i handle this with script?

Not sure what you're asking here.  Vnfs will reload the config file
if you cat /dump/+refreshconfig.

Russ

Re: [9fans] plan9port venti FreeBSD

[Serge Gagnon]

On Tue, 20 Dec 2005 23:43:47 -0500
Russ Cox <rsc@swtch.com> wrote:

> > First of all, I would like to know how can I create a venti
> > partition with the FreeBSD fdisk (the number of the partition like
> > 165 for FreeBSD) ?
> 
> You can use whatever partition number you like.
> You will need more than one partition, since arenas
> and data are kept separate.  Alternately, because
> disk partitioning is such a pain, the Unix venti
> supports an alternate syntax filename:lo-hi,
> which selects a subpartition of the named file.
> So /dev/hda:0-10G is the first 10 gigabytes of /dev/hda.
> 

I can't run fmtisect or fmtarenas directly on partition without this
error:

; sudo /usr/local/plan9/bin/venti/fmtarenas -b 8192
arenas0. /dev/ad2:0-10G 
err 0: can't determine size of
partition /dev/ad2 /usr/local/plan9/bin/venti/fmtarenas: can't open
partition /dev/ad2:0-10G: can't determine size of partition /dev/ad2
[status 1] ; 

I also tried to make a partition (/dev/as2s1d) and fmtarenas exit with
the same error.

I thought that there was probably an incompatibility with my hard
drive, then i tried it with another brand new HD with the same
result.

I'm running plan9port-20051222 on FreeBSD 5.4-STABLE .

Another question (the last):
Is there a built-in mechanism to feed the vnfs's config file or should
i handle this with script?

Thanks

-- 
GAGNON serge <serge.gagnon@b2b2c.ca>
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Re: [9fans] plan9port venti FreeBSD

[Russ Cox]

> You will need more than one partition, since arenas
> and data are kept separate.  Alternately, because

This should be arenas and index.

Re: [9fans] plan9port venti FreeBSD

[Russ Cox]

> First of all, I would like to know how can I create a venti partition with the
> FreeBSD fdisk (the number of the partition like 165 for FreeBSD) ?

You can use whatever partition number you like.
You will need more than one partition, since arenas
and data are kept separate.  Alternately, because
disk partitioning is such a pain, the Unix venti
supports an alternate syntax filename:lo-hi,
which selects a subpartition of the named file.
So /dev/hda:0-10G is the first 10 gigabytes of /dev/hda.

Russ

[9fans] plan9port venti FreeBSD

[Serge Gagnon]

Hello,
i have installed plan9port on FreeBSD 6 and i would like to setup venti on it.
I'm not a plan9 user, then i'll make a lot of tests.

First of all, I would like to know how can I create a venti partition with the 
FreeBSD fdisk (the number of the partition like 165 for FreeBSD) ?

Thanks
regards,
-- 
GAGNON serge <serge.gagnon@b2b2c.ca>
PGP KEY-ID: 0xBBC1478F
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