Having played around with cwfs for a week or so now, I'm trying to use
it to migrate my old kenfs. The relevant config line is 'filsys main
cw4f[w<0-3>]'; w4 no longer works. I've gotten w0-3 hooked up to my
cpu server and have created a devmap mapping w4 to a 30GB disk file
(the original w4 disk was slightly larger than that).
Starting up cwfs with -f (and other appropriate invocations) seems to
work fine; I give it the config, it reports the correct mapping, and I
end the conversation with 'recover main' and 'end'. The recover seems
to work fine - it reports the block numbers of a few hundred dumps -
but the process ends with this (I have CHAT(cp) always return true):
next dump at Wed Sep 19 05:00:00 2007
c_session 0
c_attach 0
fid = 1
uid = adm
arg = main
fworm: read 1400715
error: phase error -- directory entry not allocated
panic: FID1 attach to root
halted at Tue Sep 18 14:16:07 2007.
That phase error is Ealloc in 9p1.c^f_attach.
If I omit the -f from cwfs's invocation after doing the recover, I get
this, instead:
next dump at Wed Sep 19 05:00:00 2007
c_session 0
c_attach 0
fid = 1
uid = adm
arg = main
cwfs:10685: suicide: sys: trap: divide error pc=0x000131cd
PC there points to /sys/src/cmd/cwfs/cw.c:562 - cwio(); I've got acid
traces in, but I don't see anything obviously wrong (no
divide-by-zero, h->msize is positive, &c).
In this case, only the first cwfs proc has suicided; the rest are
running along, getting 9p requests (although not managing to actually
do anything with them).
I'm going to do more tracing after dinner or tomorrow, but I'm
reasonably stumped at this point. Any pointers or other help is
greatly appreciated. Particularly intriguing is why the behavior
differs, when the first case successfully completes the recover and
moves on. Attached is a summary of an acid debugging run on the
suicided process from the second form, should anyone want to take a
look.
: sophia; acid 10685
/proc/10685/text:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: lstk()
cwio(dev=0x16f408,addr=0x0,buf=0x8250cc0,opcode=0x8)+0x98
/sys/src/cmd/cwfs/cw.c:562
cw=0x85fb188
cb=0xbfd750
h=0x80a8cc0
a1=0x25dd9
bn=0xbfd750
a2=0x34000001
max=0x0
newmax=0x1
p=0xbfd750
b=0x20267
c=0x375bc
state=0x1
p1=0x25dd9
p2=0xbfd750
cwread(dev=0x16f408,b=0x0,c=0x8250cc0)+0x28 /sys/src/cmd/cwfs/cw.c:496
devread(c=0x8250cc0,b=0x0,d=0x16f408)+0x1b6 /sys/src/cmd/cwfs/sub.c:988
e=0x29743
getbuf(d=0x16f408,addr=0x0,flag=0x1)+0x1de /sys/src/cmd/cwfs/iobuf.c:109
hp=0xb5a258
p=0xbffbc0
f_attach(cp=0x85fad28,in=0xdfffebcc,ou=0xdfffeb30)+0x29b
/sys/src/cmd/cwfs/9p1.c:241
p=0x0
f=0x1762e0
fs=0x4d3b0
raddr=0x0
d=0x202af
fcall9p1(in=0xdfffebcc,ou=0xdfffeb30,cp=0x85fad28)+0x95
/sys/src/cmd/cwfs/console.c:21
t=0x56
con_attach(fid=0x1,uid=0x4058f,arg=0x1734e8)+0x84 /sys/src/cmd/cwfs/console.c:48
in=0x1ec56
ou=0x1ea57
cmd_cfs(argc=0x1,argv=0xdfffeca8)+0x70 /sys/src/cmd/cwfs/con.c:618
name=0x40571
fs=0x4d3b0
cmd_exec(arg=0x401a0)+0xdc /sys/src/cmd/cwfs/con.c:118
line=0x736663
argv=0xdfffecd4
argc=0x1
i=0x1
consserve()+0x3d /sys/src/cmd/cwfs/con.c:20
i=0x29d0
main(argv=0xdfffef88,argc=0x1)+0x2b0 /sys/src/cmd/cwfs/main.c:331
nets=0x1
_argc=0x6d
_args=0x3fd64
ann=0x0
i=0xf
_main+0x31 /sys/src/libc/386/main9.s:16
acid: print(pcfile(0x000131cd))
/sys/src/cmd/cwfs/cw.c
acid: print(pcline(0x000131cd))
562
acid: include("/sys/src/cmd/cwfs/arkive/cw.acid")
acid: cwio:dev
type 0x08
init 0xf4
link 0x00000000
dlink 0x08250cc0
private 0x00000008
size 582328845860864
_10_ {
_2_ wren {
ctrl 1504264
targ 0
lun 136645824
mapped 11903580
file 0x00029845
fd 12581824
sddir 0x00029743
sddata 0x0001841f
}
_3_ cat {
first 0x0016f408
last 0x00000000
ndev 136645824
}
_4_ cw {
c 0x0016f408
w 0x00000000
ro 0x08250cc0
}
_5_ j {
j 0x0016f408
m 0x00000000
}
_6_ ro {
parent 0x0016f408
}
_7_ fw {
fw 0x0016f408
}
_8_ part {
d 0x0016f408
base 0
size 136645824
}
_9_ swab {
d 0x0016f408
}
}
acid: cwio:h
maddr 134909120
msize 12572496
caddr 12572496
csize 155097
fsize 12572496
wsize 77718
wmax 1504264
sbaddr 0
cwraddr 136645824
roraddr 8
toytime 0
time 135584
acid: cwio:addr
0xdfffea60
acid: cwio:bn
0xdfffea38
acid: rc("cat /dev/text > /mnt/term/Users/anthony/Desktop/cwfs.acid.txt")
