Centralized Summary

[Zoltan Sogor]

Hi Peter!

We've tried to reproducate your problem but we was not succesfull yet.

Can you send us:
- a JFFS2 image before the things go wrong
- a JFFS2 image after went wrong
- erase block size
- kernel config

Thanks for bug reports.

Zoltan


Peter Grayson wrote:

>I have applied the new patch. By the way, the patch does not apply
>cleanly to the latest mtd from cvs, but it doesn't take to much to fix
>it up (this was true for the previous patch also).
>
>This version of the patch seems to take care of the previous problems I
>reported. I can now mount and unmount a previously empty partition just
>fine.
>
>There are some new problems that I am running into though. The first
>seems benign, but it ruins the CS mount performance. When mounting, I
>will occasionally see this message:
>
>jffs2_cs_process_inocache_node: Crc failure on cent_sum inocache:
>cache_crc!
>
>It looks like when this happens, the CS is abandoned and the mount time
>goes from super-fast to regular-slow. I have found that this error can
>be readily reproduced by running the following command-line once or
>twice. Seems more likely to happen if there is some data in the
>filesystem.
>
>  # mount /mnt/mtdb3 && touch /mnt/mtdb3/foo && umount /mnt/mtdb3
>
>The other problems I am seeing are more severe. A kernel panic
>occasionally happens at mount time. There is also a kernel panic that
>happens at unmount time. I have included stack traces below. The failure
>modes seem consistent. The test I am running to make these problems
>happen is to write a summarized jffs2 image to a partition and then
>repeatedly mount and unmount the partition (like above, but without the
>touch).
>
># mount /mnt/mtdb3
>Oops: kernel access of bad area, sig: 11 [#1]
>PREEMPT
>NIP: C00B0884 LR: C00B10D8 SP: C3F21C30 REGS: c3f21b80 TRAP: 0300    Not
>tainted
>MSR: 00029030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
>DAR: C423FFCC, DSISR: 00800000
>TASK = c3eb2ab0[97] 'mount' THREAD: c3f20000
>Last syscall: 21
>GPR00: 000005B7 C3F21C30 C3EB2AB0 C3EBD600 C3F21C50 C3EBD6C8 00000000
>C033A810
>GPR08: C3F00000 0033FFCC C3F00000 C423FFCC 39008039 000066A4 00000000
>00000000
>GPR16: 10079130 10070000 00020000 00000001 0B440000 00000003 C3EEEDE0
>C3EEEE0B
>GPR24: C01C0000 000003B5 C036964C 00000012 C01C0000 C01DFC4C C01C0010
>C3EBD600
>NIP [c00b0884] jffs2_cs_process_list+0x38/0x5c
>LR [c00b10d8] jffs2_cs_build_filesystem+0x830/0xcd0
>Call trace:
> [c00a8238] jffs2_do_mount_fs+0x220/0x8a4
> [c00aaa24] jffs2_do_fill_super+0x1ac/0x2b8
> [c00aae68] jffs2_get_sb_mtd+0xb4/0x13c
> [c00ab0fc] jffs2_get_sb+0x19c/0x1dc
> [c004edbc] do_kern_mount+0x5c/0x124
> [c0067458] do_mount+0x6c0/0x71c
> [c0067938] sys_mount+0x9c/0xf0
> [c0002a20] ret_from_syscall+0x0/0x48
>
># mount /mnt/mtdb3 && umount /mnt/mtdb3
>dumping centsum data
>jffs2_flash_writev(): Non-contiguous write to 00000000
>kernel BUG in jffs2_flash_writev
>at /home/pgrayson/project/realmlinux1/linux-2.6/fs/jffs2/wbuf.c:690!
>Oops: Exception in kernel mode, sig: 5 [#1]
>PREEMPT
>NIP: C00AC5AC LR: C00AC58C SP: C0369CE0 REGS: c0369c30 TRAP: 0700    Not
>tainted
>MSR: 00029030 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
>TASK = c3eb3190[854] 'umount' THREAD: c0368000
>Last syscall: 22
>GPR00: 00000000 C0369CE0 C3EB3190 0000003A 00002F4C FFFFFFFF 00002F12
>C0190000
>GPR08: C0195C43 C01B0000 00000008 C0369C10 52000095 000066A4 00000000
>00000000
>GPR16: 10000140 C0369DB0 C3EBD114 00000000 00000000 100743A8 FFFFFFFF
>00000002
>GPR24: C0369D80 00000000 C3FC0000 00000000 00000000 C3880000 00000CB4
>C3EBD000
>NIP [c00ac5ac] jffs2_flash_writev+0x1cc/0x61c
>LR [c00ac58c] jffs2_flash_writev+0x1ac/0x61c
>Call trace:
> [c00b024c] jffs2_cs_write_inocache+0xcc/0x174
> [c00b04e4] jffs2_cs_dump_ic+0x1f0/0x284
> [c00ab198] jffs2_put_super+0x5c/0x184
> [c004d828] generic_shutdown_super+0xc8/0x1bc
> [c00ab2d8] jffs2_kill_sb+0x18/0x3c
> [c004d72c] deactivate_super+0xa0/0xd4
> [c0065abc] __mntput+0x30/0x44
> [c0055560] path_release_on_umount+0x4c/0x60
> [c0066390] sys_umount+0x2bc/0x2d4
> [c0002a20] ret_from_syscall+0x0/0x48
>
>Thanks for your efforts.
>
>Pete
>
>On Fri, 2005-05-13 at 10:32 +0200, Ferenc Havasi wrote:
>  
>
>>Hi Pete,
>>
>>We updated the summary patches.
>>
>>Erase block summary:
>>- fix a small bug, may cause problem only in debug mode
>>
>>Centralized summary:
>>- fix a small bug, may cause problem only in debug mode
>>- fix locking problem on empty fs
>>- fix bad block size accounting (and counting free space)
>>
>>You can download the patches from our site.
>>
>>Bye,
>>Ferenc
>>
>>    
>>
>
>
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