PATCH: Arla 0.90 on Linux 2.6.24 to Linux 2.6.28

[Michael Milligan]

Thanks for all your efforts to get this working on recent Linux kernels.

However, I'm still having issues with arlad/nnpfs blowing it's brains
out on 2.6.27 (the Ubuntu version specifically... 2.6.27-9-generic).

Here's what I'm seeing (debug logs... I apologize if wrapped lines are
ugly):

arlad:  (run as "/usr/sbin/arlad -z -n
--debug=kernel,cache-manager,volume-cache,file-cache,errors,warnings")

2008-12-18 19:28:07 UTC: arla: read_data: from 0 to 0x800
2008-12-18 19:28:07 UTC: arla: worker 0: done
2008-12-18 19:28:07 UTC: arla: worker 0 waiting
2008-12-18 19:28:07 UTC: arla: worker 0: processing
2008-12-18 19:28:07 UTC: arla: fcache_get_attr: have attr
2008-12-18 19:28:07 UTC: arla: fcache_get_attr: doing read_attr
2008-12-18 19:28:08 UTC: arla: trying to fetch status: 0
2008-12-18 19:28:08 UTC: arla: read_data: from 0 to 0x6
2008-12-18 19:28:08 UTC: arla: cm_getattr
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: doing read_attr
2008-12-18 19:28:08 UTC: arla: trying to fetch status: 0
2008-12-18 19:28:08 UTC: arla: cm_getattr: done get attr
2008-12-18 19:28:08 UTC: arla: cm_getattr: return: 0
2008-12-18 19:28:08 UTC: arla: worker 0: done
2008-12-18 19:28:08 UTC: arla: worker 0 waiting
2008-12-18 19:28:08 UTC: arla: worker 0: processing
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: have attr
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: doing read_attr
2008-12-18 19:28:08 UTC: arla: trying to fetch status: 0
2008-12-18 19:28:08 UTC: arla: read_data: from 0 to 0x8
2008-12-18 19:28:08 UTC: arla: cm_getattr
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: doing read_attr
2008-12-18 19:28:08 UTC: arla: trying to fetch status: 0
2008-12-18 19:28:08 UTC: arla: cm_getattr: done get attr
2008-12-18 19:28:08 UTC: arla: cm_getattr: return: 0
2008-12-18 19:28:08 UTC: arla: worker 0: done
2008-12-18 19:28:08 UTC: arla: worker 0 waiting
2008-12-18 19:28:08 UTC: arla: worker 0: processing
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: have attr
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: doing read_attr
2008-12-18 19:28:08 UTC: arla: trying to fetch status: 0
2008-12-18 19:28:08 UTC: arla: cm_getattr
2008-12-18 19:28:08 UTC: arla: fcache_get_attr: have attr
2008-12-18 19:28:08 UTC: arla: cm_getattr: done get attr
2008-12-18 19:28:08 UTC: arla: cm_getattr: return: 0
2008-12-18 19:28:08 UTC: arla: worker 0: done
2008-12-18 19:28:08 UTC: arla: worker 0 waiting
2008-12-18 19:28:09 UTC: arla: worker 0: processing
arlad: messages.c:671: nnpfs_message_getnode: Assertion
`(dentry)->flags.kernelp' failed.

nnpfs (kernel):

Dec 18 19:28:08 cheetah kernel: [17462.488859] nnpfs_block_open(00/03@)
walk failed: -2
Dec 18 19:28:08 cheetah kernel: [17462.488874] (1.536871004.1.1), fid
65542, id 3
Dec 18 19:28:08 cheetah kernel: [17462.488879] nnpfs_block_open: n 1,
mask 1, inode e7ad3a7c, aliases:  .acmeps.com(e1c0ac38)
Dec 18 19:28:08 cheetah kernel: [17462.488889] nnpfs_block_open failed: 2

And if I then try to umount /afs, I get:

Dec 18 19:31:30 cheetah kernel: [17664.616797] BUG: Dentry
d9ff6198{i=1f0f28,n=000000000ef1fca7.mpg} still in use (-1) [unmount of
nnpfs nnpfs]
Dec 18 19:31:30 cheetah kernel: [17664.616838] ------------[ cut here
]------------
Dec 18 19:31:30 cheetah kernel: [17664.616841] kernel BUG at
/build/buildd/linux-2.6.27/fs/dcache.c:666!
Dec 18 19:31:30 cheetah kernel: [17664.616844] invalid opcode: 0000 [#2]
SMP

.... [ugly possibly unneeded msgs deleted]

This is just from reading files, not even trying to write.  It's
intermittent.  It works great up until I get either a "walk failed"
message or a message like:

Dec 18 19:21:17 cheetah kernel: [17051.214123] reading block 03/C7/00:
not there

Write seems to generally have the same problem.

Any ideas on how to debug this further?

Regards,
Mike

-- 
Michael Milligan                                   -> milli at acmeps.com