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Re: SGI XFS on ppc

To: linux-xfs@xxxxxxxxxxx
Subject: Re: SGI XFS on ppc
From: Thomas Graichen <news-innominate.list.sgi.xfs@xxxxxxxxxxxxx>
Date: 5 Aug 2000 14:00:09 GMT
Distribution: local
Organization: innominate AG, Berlin, Germany
References: <news-innominate.list.sgi.xfs@xxxxxxxxxxxxx> <200008032028.PAA15107@xxxxxxxxxxxxxxxxxxxx> <news2mail-8mcr7m$kdj$1@xxxxxxxxxxxxxxxxxxxxxx> <398A0540.CF7DA075@xxxxxxxxxxx> <news2mail-8mdk6a$lqf$1@xxxxxxxxxxxxxxxxxxxxxx> <8mdkni$lqf$2@xxxxxxxxxxxxxxxxxxxxxx>
Reply-to: Thomas Graichen <graichen@xxxxxxxxxxxxx>
Reply-to: thomas.graichen@xxxxxxxxxxxxx
Sender: owner-linux-xfs-announce@xxxxxxxxxxx
User-agent: tin/1.4.2-20000205 ("Possession") (UNIX) (Linux/2.2.16-local (i586))
Thomas Graichen <graichen@xxxxxxxxxxxxx> wrote:

> ok - due to some response from the ppc-dev list it's a bug in the
> ppc kernel implementation of the shifts and i have a patch for it
> now which i'll try this evening and i expect xfs to run then fine
> on the ppc ... lets see :-)

[one question before i begin: do you have interchanging filesystems
on disk between irix/mips and linux/i386 working completely and
without errors so far - so that one can expect the on disk layout
to be completely portable and tested and use an i386 generated
diskimage for other arches to test - what i do here ? - i think
and hope so ...]

ok - now tried the fix for the ppc >32 shift bug and it now shifts
correctly and thus it now also mounts fine with the original xlatesb
with the shifts > 32 in it - so this problem is fixed now ... but
if i try to write to the filesystem it crashes with

  XFS assertion failed: indlen > 0, file: xfs_bmap.c, line:4904

so - lets do this step by step:

what do i do: mount the xfs fs, cd into it and copy the one file (XFS)
there to "test" - somewhere there it crashes

what i tried: i tried to get a full page_buf trace for this but ran
into another problem - there seems to be so far no way to capture
the traceoutput - klogd/syslog seems to loose some of the printk's
(the XFS assertion failed does not even appear in it *) and also
delays do not help here - because i don't have a serial port on an
imac i can't capture it on a remote serial console - so the only
way so far is to write it down from screen :-( (but i did it :-)

*) although it appears on the console screen ...

does anyone have an idea how to get all the kernel printk's definitely
to somewhere (file or somehow remote or maybe redirecting the console
or something like ...) ?

ok - lets go on: so that the kernel crash output does not trash
the trace i removed the BUG() in assertfail and replaced it by
an infinite loop so that i have time to type the trace from the
screen - i did it in two ways: first reduced - only the events
(this way a lot of them fit on screen) and later the last few
trace entries complete - ok - here they are - i hope that is
a good start (together with the used 32mb diskimage from

  http://innominate.org/~graichen/projects/xfs-pp/xfs.dd.gz

which is used here too) to reproduce the sequence for you and
maybe get an idea by comparing the trace outputs - so now first
the reduced output and then the full for the last entries

avl_ins
look_pg
get_obj
TRANS_READ
XFS_RELSE
unlock
rele
free_obj
free_lk
freed_l
lock
locked
XFS_PIN
pin
XFS_PIN
pin
XFS_PIN
pin
XFS_UNLOCK
unlock
rele
delwri_q
XFS_UNLOCK
rele
unlock
delwri_q
walkq1
walkq1
walkq1
get
look_pg
iostart
ioreq
hold
rele
iowait
done
iowaited
hold
rele
rele
free_obj
XFS assertion failed: indlen > 0, file: xfs_bmap.c, line:4904

ok and now the detailed one:

pb 0xc1d0d500 [iostart] (hold 1 lock 0) misc 0x00000001
    address 0xc5871f04
    offset 0x0 size 0x1000 task 0xc1840000
    flags: READ MAPPED NONE ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [ioreq] (hold 1 lock 0) misc 0x00000000
    address 0xc586f958
    offset 0x0 size 0x1000 task 0xc1840000
    flags: READ MAPPED NONE ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [hold] (hold 2 lock 0) misc 0x00000000
    address 0xc5870908
    offset 0x0 size 0x1000 task 0xc1840000
    flags: READ MAPPED NONE ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [rele] (hold 2 lock 0) misc 0x00000000
    address 0xc5870a2c
    offset 0x0 size 0x1000 task 0xc1840000
    flags: READ MAPPED NONE ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [iowait] (hold 1 lock 0) misc 0x00000000
    address 0xc586f9ac
    offset 0x0 size 0x1000 task 0xc1840000
    flags: READ MAPPED NONE ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [done] (hold 1 lock 0) misc 0x00000000
    address 0xc586fc74
    offset 0x0 size 0x1000 task 0xc01cfff0
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [iowaited] (hold 1 lock 0) misc 0x00000000
    address 0xc586f9ac
    offset 0x0 size 0x1000 task 0xc1840000
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [hold] (hold 2 lock 0) misc 0x00000000
    address 0xc5870908
    offset 0x0 size 0x1000 task 0xc1840000
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [rele] (hold 2 lock 0) misc 0x00000000
    address 0xc5870a2c
    offset 0x0 size 0x1000 task 0xc1840000
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [rele] (hold 1 lock 0) misc 0x00000000
    address 0xc5871f24
    offset 0x0 size 0x1000 task 0xc1840000
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
pb 0xc1d0d500 [free_obj] (hold 1 lock 0) misc 0x00000000
    address 0xc586f4b4
    offset 0x0 size 0x1000 task 0xc1840000
    flags: MAPPED ALL_PAGES_MAPPED MEM_ALLOCATED
XFS assertion failed: indlen > 0, file: xfs_bmap.c, line:4904

ok - that is all for now - i hope this gets you to the right
track somehow

a lot of thanks in advance

t
-- 
thomas.graichen@xxxxxxxxxxxxx
Technical Director                                       innominate AG
Clustering & Security                                networking people
tel: +49.30.308806-13  fax: -77                   http://innominate.de

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