Re: [9front] cfs(4)

[Xiao-Yong Jin <meta.jxy@gmail.com>]

> On Feb 12, 2021, at 6:30 PM, james palmer <james@biobuf.link> wrote:
> 
> Quoth meta.jxy@gmail.com:
>> What is that ramdisk provides that ramfs does not?
>> Is there any 9p protocol not implemented properly?
> 
> iirc ramfs dynamically allocates data for its files.
> data that is all 0 is not stored in memory.
> ramdisk reserves a section of memory and presents it as a disk device.
> cfs seems to assume the ramfs file is of 0 size.

So you didn't see my dd command.

> 
>> Like I said, putting it in plan9.ini seems to work,
>> but I can't figure out why running it manually does not.
>> What am I supposed to do?
> 
> you are running it with -d. this enables debugging and keeps in in the foreground. it is not hung, it is waiting for a 9p connection.

No.

------

The actual issue is that devsrv disallows read/write
to the file if the channel is already open.
Even if I unmount, I still cannot read/write the srv file.
The following is fine.

; ramfs
; dd -if /dev/zero -of /tmp/cache -bs 1m -count 16
16+0 records in
16+0 records out
; srv 9front.org
post...
; cfs -F /srv/9front.org -dnS -f /tmp/cache
dinit: bsize 0x0<= 0
formatting disk
formatting inodes
<-client: Tversion tag 65535 msize 8216 version '9P2000'
->server: Tversion tag 65535 msize 8216 version '9P2000'
<-server: Rversion tag 65535 msize 8216 version '9P2000'
->client: Rversion tag 65535 msize 8216 version '9P2000'
<-client: Tattach tag 91 fid 1506 afid -1 uname jxy aname 
->server: Tattach tag 91 fid 1506 afid -1 uname jxy aname 
<-server: Rattach tag 91 qid (000000000000e00c 8 d)
->client: Rattach tag 91 qid (000000000000e00c 8 d)
; lc /mnt/cfs/
<-client: Twalk tag 91 fid 1506 newfid 1515 nwname 0 
->server: Twalk tag 91 fid 1506 newfid 1515 nwname 0 
<-server: Rwalk tag 91 nwqid 0 
->client: Rwalk tag 91 nwqid 0 
<-client: Tstat tag 91 fid 1515
->server: Tstat tag 91 fid 1515
<-server: Rstat tag 91  stat 'n' 'sl' 'sys' 'sl' q (000000000000e00c 8 d) m 020000000775 at 1608616529 mt 1608616529 l 0 t 77 d 62
->client: Rstat tag 91  stat 'n' 'sl' 'sys' 'sl' q (000000000000e00c 8 d) m 020000000775 at 1608616529 mt 1608616529 l 0 t 77 d 62
new file 57356.8 ino 0
<-client: Tclunk tag 36 fid 1515
->server: Tclunk tag 36 fid 1515
<-server: Rclunk tag 36
->client: Rclunk tag 36
<-client: Twalk tag 91 fid 1506 newfid 1517 nwname 0 
->server: Twalk tag 91 fid 1506 newfid 1517 nwname 0 
<-server: Rwalk tag 91 nwqid 0 
->client: Rwalk tag 91 nwqid 0 
<-client: Topen tag 91 fid 1517 mode 0
->server: Topen tag 91 fid 1517 mode 0
<-server: Ropen tag 91 qid (000000000000e00c 8 d) iounit 8192 
->client: Ropen tag 91 qid (000000000000e00c 8 d) iounit 8192 
<-client: Tread tag 91 fid 1517 offset 0 count 8192
->server: Tread tag 91 fid 1517 offset 0 count 8192
<-server: Rread tag 91 count 483 '3b004d00 3e000000 80210000 00e8ce00 00000000 00fd0100 80d07fe1 5fd07fe1 5f000000 00000000 0005006c 69737473 0200736c 03007379 73020073 6c3c004d'
->client: Rread tag 91 count 483 '3b004d00 3e000000 80210000 00e8ce00 00000000 00fd0100 80d07fe1 5fd07fe1 5f000000 00000000 0005006c 69737473 0200736c 03007379 73020073 6c3c004d'
<-client: Tread tag 91 fid 1517 offset 483 count 8192
->server: Tread tag 91 fid 1517 offset 483 count 8192
<-server: Rread tag 91 count 0 ''
->client: Rread tag 91 count 0 ''
<-client: Tclunk tag 91 fid 1517
->server: Tclunk tag 91 fid 1517
<-server: Rclunk tag 91
->client: Rclunk tag 91
9front/		extra/		fqa/		hardware/	iso/		lists/		pkg/		sites/
; unmount /mnt/cfs
; <-client: Tclunk tag 70 fid 1506
->server: Tclunk tag 70 fid 1506
<-server: Rclunk tag 70
->client: Rclunk tag 70

; rm /srv/9front.org